WO2020087622A1 - 管式厚膜加热器保护装置及管式厚膜加热器 - Google Patents

管式厚膜加热器保护装置及管式厚膜加热器 Download PDF

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Publication number
WO2020087622A1
WO2020087622A1 PCT/CN2018/118201 CN2018118201W WO2020087622A1 WO 2020087622 A1 WO2020087622 A1 WO 2020087622A1 CN 2018118201 W CN2018118201 W CN 2018118201W WO 2020087622 A1 WO2020087622 A1 WO 2020087622A1
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WO
WIPO (PCT)
Prior art keywords
tube
outer tube
heating
thick film
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/118201
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English (en)
French (fr)
Inventor
杜少玲
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Heating Leader Electronic Technology Co Ltd
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Heating Leader Electronic Technology Co Ltd
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Filing date
Publication date
Application filed by Heating Leader Electronic Technology Co Ltd filed Critical Heating Leader Electronic Technology Co Ltd
Priority to EP18938483.7A priority Critical patent/EP3875868B1/en
Publication of WO2020087622A1 publication Critical patent/WO2020087622A1/zh
Priority to US17/242,243 priority patent/US12098866B2/en
Anticipated expiration legal-status Critical
Priority to US18/776,255 priority patent/US20240373515A1/en
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/06—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with the heat-exchange conduits forming part of, or being attached to, the tank containing the body of fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
    • F24H1/142—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form using electric energy supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/121—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium using electric energy supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/128—Preventing overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/14—Cleaning; Sterilising; Preventing contamination by bacteria or microorganisms, e.g. by replacing fluid in tanks or conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/335—Control of pumps, e.g. on-off control
    • F24H15/34—Control of the speed of pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/37—Control of heat-generating means in heaters of electric heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/001—Guiding means
    • F24H9/0015—Guiding means in water channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/02—Casings; Cover lids; Ornamental panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1818—Arrangement or mounting of electric heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2028—Continuous-flow heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • F28F1/405—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element and being formed of wires
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/281—Input from user
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/288—Accumulation of deposits, e.g. lime or scale
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/395—Information to users, e.g. alarms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0024—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for combustion apparatus, e.g. for boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/06—Fastening; Joining by welding
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/007—Heaters using a particular layout for the resistive material or resistive elements using multiple electrically connected resistive elements or resistive zones
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/013—Heaters using resistive films or coatings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/016—Heaters using particular connecting means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/021—Heaters specially adapted for heating liquids

Definitions

  • the invention relates to the technical field of liquid heaters, in particular to a protection device for protecting a tubular thick film heater, and a tubular thick film heater with a protection function.
  • tubular thick film heater In the application of the tubular thick film heater, it is necessary to achieve electrical connection and control with the outside world; when the heater is working, the surface of the heating resistor is charged and the working temperature is high, and it is necessary to perform safety protection and heat insulation from the outside world.
  • the existing tube-type thick film heater is only installed with a protective shell for protection on the outside of the tube-type heater assembly, and it cannot well isolate the tube-type thick-film heater from the outside electrically and thermally when working. It is dangerous.
  • the object of the present invention is to provide a tube-type thick film heater protection device for protecting the tube-type heater assembly.
  • Tubular thick film heater protection device used to provide protection for tubular heater components, including:
  • the upper tube includes a side of the upper tube and an annular surface provided inside; the outer ring surface of the annular surface is integrally connected with the upper part of the upper side of the upper tube, and the radius of the inner ring surface of the annular surface is less than Radius of the inner side of the inner tube of the tube heater assembly; a flange extends downwards along the inner ring surface of the torus, and the space between the flange and the inner side wall of the upper tube side constitutes a tube-type heater
  • the upper groove of the upper part of the device assembly; the lower part of the side of the upper cylinder is provided with a first locking mechanism;
  • the central part of the base is provided with a round hole for the liquid conduit of the tube heater assembly to protrude.
  • the base is also provided with a lower groove, which is concave
  • the inner radius of the groove is smaller than the inner radius of the inner tube of the tube heater assembly, and the outer radius of the lower groove is greater than the outer radius of the outer tube of the tube heater assembly;
  • the base is provided with elasticity Electric connection piece, when the lower part of the tube heater assembly is installed on the lower groove, the terminal contact of the elastic electric connection piece can be contacted with the electrode on the outer tube of the tube heater assembly;
  • the base The side wall or the bottom is provided with a terminal block, the terminal block is electrically connected to the elastic connecting piece, the terminal block can be externally connected to a power supply;
  • the base is provided with a second lock that matches and locks with the first locking mechanism Locking mechanism.
  • the elastic electrical connection piece extends down to the terminal, thereby achieving electrical connection with the terminal.
  • the tube thick film heater protection device provided by the embodiment of the present invention sets the tube heater assembly in the sealed space formed by the upper tube and the base through cooperation of the upper tube and the base, thereby realizing heating of the tube heater component
  • the circuit surface is relatively isolated from the outside air. This not only avoids the influence of the external environment on the surface of the heating circuit of the tube heater assembly, thereby affecting the heating efficiency, protecting the heater, but also avoids the electric shock accidents that may occur when the surface of the heating circuit of the tube heater assembly is charged. Provide protection to operators.
  • the upper tube and the base are preferably made of heat-insulating and flame-retardant materials, and flame-retardant PP or PE is selected.
  • it further includes a first annular groove seal ring disposed in the upper groove and a second annular groove seal ring disposed in the lower groove, the groove width of the first annular groove seal ring and the tube type
  • the width of the upper part of the heater assembly matches, and the groove width of the second annular groove sealing ring matches the width of the lower part of the tube heater assembly.
  • the first annular groove sealing ring and the second annular groove sealing ring are provided to realize the sealed connection of the tubular heater assembly with the upper groove and the lower groove, thereby avoiding the influence of the external environment on the surface of the heater and reducing the heat Loss, improve heating efficiency.
  • the upper cylinder is a cylinder
  • the base is a round base
  • the annular seal ring is disposed on a joint portion of the cylinder and the round base.
  • the first positioning device can determine the relative position of the tube heater assembly and the base, such as aligning the liquid inlet conduit of the tube heater assembly with the first positioning device to achieve the positioning of the tube heater assembly and the base.
  • the terminal contacts of the elastic electrical connection piece can just achieve contact contact with the electrodes on the outer tube of the tube heater assembly.
  • a second positioning device is provided on the inner ring flange of the downward-facing ring, and the second positioning device is used to determine the matching position of the tube heater assembly and the upper tube to realize the first locking mechanism and the second The position of the locking mechanism matches.
  • the first locking mechanism includes a buckle with a bayonet
  • the second locking mechanism includes a resilient member clip with a protrusion, which can be realized by matching the protrusion of the clip with the bayonet of the buckle Locking function
  • the second locking mechanism includes a buckle with a bayonet
  • the first locking mechanism includes an elastic member clip with a protrusion
  • the protrusion of the clip can be matched with the bayonet of the buckle to achieve a locking function .
  • the buckle is provided at the lower part of the inner side of the upper tube.
  • an installation fixing device is provided on the outer side wall of the upper tube.
  • the fixing device is used to realize the fixed connection of the entire tube-type thick film heater and the protective shell.
  • An embodiment of the present invention also provides a tubular thick-film heater with a protection function, including the above-described tubular thick-film heater protection device, and further includes a tubular heater assembly; the upper portion of the tubular heater assembly is sheathed on the In the upper groove, the lower part of the heater assembly is sleeved in the lower groove;
  • Tubular heater assembly including:
  • Inner tube the outer wall of the inner tube is equipped with a spiral diversion structure
  • the outer tube is sheathed outside the spiral diversion structure; the outer wall of the outer tube is provided with a heating assembly; the inner circumferential wall of the outer tube and the spiral diversion structure are separated by a predetermined radial gap;
  • a flow channel is formed between the inner tube and the outer tube, and at least one opening of the flow channel is covered by a sealing end cap; the cavity wall of the flow channel is provided with a liquid inlet and a liquid outlet;
  • the sealed end cap is an annular sealed end cap, which includes an inner circular wall and an outer circular wall arranged concentrically, and upper sealing surfaces respectively connected to the upper part of the inner circular wall and the upper part of the outer circular wall; and respectively connected to the lower part of the inner circular wall With the lower sealing surface at the lower part of the outer circular wall, the inner circular wall and the outer peripheral wall end of the inner tube are sealed and fixed, and the outer circular wall and the inner peripheral wall end of the outer tube are sealed and fixed.
  • the tubular thick film heater with protection function provided by the embodiment of the present invention, through the cooperation of the upper cylinder and the base, sets the tubular heater assembly in the sealed space formed by the upper cylinder and the base, thereby realizing the tubular heater
  • the surface of the heating circuit of the module is relatively isolated from the outside air. This not only avoids the influence of the external environment on the surface of the heating circuit of the tube heater assembly, thereby affecting the heating efficiency, protecting the heater, but also avoids the electric shock accidents that may occur when the surface of the heating circuit of the tube heater assembly is charged. Provide protection to operators.
  • the technical solution of the present invention also changes the design of the U-shaped sealed end by redesigning the sealed end cover, and is designed as an annular sealed end.
  • the annular sealed end cover includes only four faces, which are respectively concentric inner wall
  • the upper sealing surface and the lower sealing surface are all regular surfaces, which can be formed only by stamping or cutting processes. It is not like U-shaped seal end that requires multiple stamping and stretching to form. Therefore, the processing technology is extremely simplified, the processing control technology is simple, the processing cost is low, and the processing efficiency can be greatly improved.
  • the annular sealing end cover in the tube heater assembly provided by the present invention has the same sealing effect as the U-shaped sealing end cover.
  • the ring-shaped sealing end cap can be placed between the outer wall of the inner tube and the inner wall of the outer tube, so as to achieve welding between the inner round wall and the end of the outer wall of the inner tube by welding or the like Sealing and fixing, and welding sealing and fixing between the outer round wall and the end of the inner peripheral wall of the outer tube.
  • the welding method is preferably laser welding or argon arc welding, which can make the welded port smooth and smooth.
  • the range of the predetermined radial gap is not greater than 1.0 mm.
  • the spiral diversion structure is formed by a spiral metal wire sleeved on the inner tube.
  • the spiral metal wire is a stainless steel wire, and the stainless steel wire is welded to the outer peripheral wall of the inner tube; and / or, the axial cross-sectional shape of the spiral metal wire is triangular, trapezoidal, or rectangular, and / Or, the two ends of the inner tube are flush with the two ends of the outer tube, respectively.
  • both the inner tube and the outer tube are stainless steel tubes, and the sealed end cap is a stainless steel end cap.
  • the heating assembly includes: the heating assembly includes: an insulating dielectric layer disposed on the outer peripheral wall of the outer tube, and a heating circuit disposed on the insulating dielectric layer, the heating circuit includes a fixed A plurality of heating resistors and electrodes on the insulating dielectric layer, and both ends of the heating resistor are electrically connected to the electrodes, respectively.
  • each heating resistor is consistent with the length direction of the outer tube;
  • the liquid inlet is connected with a water pump;
  • the heating circuit further includes a first temperature sensor, and the first temperature sensor A first controller electrically connected to the sensor;
  • the first temperature sensor is arranged at a position of the outer tube near the liquid outlet, and the first controller is used for Temperature information, which controls the speed of the water pump and / or the heating power of the heating resistor.
  • the tube heater assembly further includes a second temperature sensor and a second controller electrically connected to the second temperature sensor;
  • the second temperature sensor is disposed on the outer tube and is located near the heating resistor, and is used to detect the temperature of the outer tube at the position where it is located;
  • the second controller is used to receive the second temperature sensor The temperature of the outer tube, and when the temperature of the outer tube is higher than the first preset temperature threshold within the first preset heating time period, the heating circuit is controlled to be disconnected and / or an empty burn reminder is issued.
  • the second temperature sensor is also arranged close to the liquid outlet, and the power density of the heating resistor close to the second temperature sensor is greater than the heating resistance of the second temperature sensor in the circumferential direction Power density; the second controller is also used when the received temperature of the outer tube is higher than the second preset temperature threshold during the second preset heating period / or is higher than the second preset temperature during operation At the threshold, the heating circuit is controlled to be disconnected and / or a reminder message for over-temperature protection is issued.
  • both the liquid inlet and the liquid outlet are provided on the inner tube, a liquid inlet conduit is arranged at a position of the inner tube corresponding to the liquid inlet, and the inner tube corresponds to the liquid outlet A liquid outlet duct is arranged at the position of the port, and at least the liquid inlet duct is arranged obliquely with respect to the center line of the inner tube.
  • the heating resistor provided on the stainless steel pipe is directly opposed to the spiral diversion structure through the stainless steel pipe.
  • the heating resistance is in the liquid flow channel of the inner wall of the outer tube, which can achieve a better heating effect.
  • the beneficial effect of the present invention is that: the end of the inner tube and the outer tube forming the flow channel is sealedly connected by the sealed end cap, specifically, the end of the inner and outer tube is buckled by the sealed end cap and then passed through it
  • the first flanging and the second flanging are welded to the inner and outer tubes, and the sealing connection structure is processed independently, which is convenient for manufacturing, avoids the complicated process of the outer flanging of the inner tube, is easy to realize mass production, and reduces the manufacturing cost
  • the sealing effect is better, which improves the stability of the heating device to withstand high temperature and high pressure environment for a long time.
  • FIG. 1 is a schematic diagram of an explosion structure of a tubular thick film heater with a protection function provided by an embodiment of the present invention
  • FIG. 2 is a schematic diagram of the three-dimensional structure of FIG. 1;
  • FIG. 3 is a schematic view of the top structure of FIG. 2;
  • FIG. 4 is a cross-sectional view taken along line B-B in FIG. 3;
  • FIG. 5 is a cross-sectional view taken along line C-C in FIG. 3;
  • Figure 6 is a schematic diagram of the explosion structure of the tube heater assembly
  • FIG. 7 is a schematic diagram of the three-dimensional structure of FIG. 6;
  • FIG. 8 is a schematic diagram of the top structure of FIG. 7;
  • FIG. 9 is a schematic diagram of the structure of the ring-shaped sealing end cover
  • FIG. 10 is a cross-sectional view taken along line A-A in FIG. 8.
  • tube heater assembly 1, inner tube; 11, helical diversion structure; 12, liquid inlet; 121, liquid inlet pipe; 13, liquid outlet; 131, liquid outlet pipe; 14, Flow channel; 20, heating assembly; 21, outer tube; 211, insulating medium layer; 22, heating circuit; 221, heating resistance; 222, electrode; 223, first temperature sensor; 224, second temperature sensor; 3 , Annular seal end cap; 31, inner round wall; 32, outer round wall; 33, upper sealing surface; 34, lower sealing surface; 40, upper cylinder; 41, upper cylinder side; 42, annular surface; 43, inner Torus; 44, mounting fixture; 45, flange; 46, first locking mechanism; 47, upper groove; 48, second positioning device; 51, first ring groove seal ring; 52, second ring Groove seal ring; 53, annular seal ring; 60, base; 61, second locking mechanism; 62, elastic connection piece; 63, lower groove; 64, first positioning device; 65, terminal block; 70, Seal the space.
  • connection should be understood in a broad sense, for example, it can be fixedly connected or detachable. Or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, or the internal communication between two components.
  • an embodiment of the present invention provides a tubular thick film heater with a protection function, including a tubular thick film heater protection device and a tubular heater assembly 10.
  • the upper portion of the tube heater assembly 10 is sleeved in the upper groove 47 of the upper tube 40, and the lower portion of the tube heater assembly 10 is sleeved in the lower groove 63 of the base 60.
  • the upper part of the tube heater assembly 10 is first sleeved in the groove of the first annular groove sealing ring 51, and then the first ring groove sealing ring 51 is sleeved in the upper groove 47; tube heating
  • the lower part of the device assembly 10 is first sleeved in the groove of the second annular groove seal ring 52, and then the second annular groove seal ring 52 is sleeved in the lower groove 63.
  • the tube heater assembly 10 and the tube thick film heater protection device can be made The connection is tighter, making a relatively isolated sealed space 70 composed of the surface of the heating circuit 22 of the tube heater assembly 10, the upper tube 40 and the base 60 more tightly sealed, reducing the influence of external air on the surface of the heating circuit 22 and reducing the sealing
  • the heat loss in the space 70 improves the heating efficiency.
  • the tubular thick film heater protection device is used to provide protection for the tubular heater assembly 10, including:
  • the upper tube 40 includes an upper tube side surface 41 and an annular surface 42 which are provided in the inner space. Radius of the inner side of the inner tube 1 of the tube heater assembly 10; a flange 45 extends downward along the inner ring surface 43 of the torus 42, and the space between the flange 45 and the inner side wall of the upper tube side 41 constitutes an accommodation
  • the upper groove 47 of the upper part of the tube heater assembly 10; the lower part of the upper side 41 of the cylinder is provided with a first locking mechanism 46;
  • the central part of the base 60 is provided with a round hole for extending the outlet conduit 131 of the tube heater assembly 10, and the base 60 is also provided with a lower groove 63 whose inner side radius is smaller than the tube heater The radius of the inner side of the inner tube 1 of the assembly 10, the outer radius of the lower groove 63 is larger than the radius of the outer side of the outer tube 21 of the tube heater assembly 10; the base 60 is provided with an elastic connection piece 62, and the tube heater assembly When the lower part 10 is installed on the lower groove 63, the terminal contacts of the elastic connection piece 62 can be contacted with the electrode 222 on the outer tube 21 of the tube heater assembly 10; the terminal wall of the base 60 is provided with a terminal 65, The connecting terminal 65 is electrically connected to the elastic connecting piece 62, and the connecting terminal 65 can be externally connected to a power supply; the base 60 is provided with a second locking mechanism 61 that matches and locks with the first locking mechanism 46.
  • the connecting terminal 65 can be directly provided with a power cord, and connected to the socket through
  • the protective device of the tubular thick film heater provided by the embodiment of the present invention sets the tubular heater assembly 10 in the sealed space 70 formed by the upper tube 40 and the base 60 through the cooperation of the upper tube 40 and the base 60.
  • the surface of the heating circuit 22 of the tube heater assembly 10 is relatively isolated from outside air. This not only avoids the influence of the external environment on the surface of the heating circuit 22 of the tube heater assembly 10, thereby affecting the heater, but also avoids the electric shock accidents that may occur when the surface of the heating circuit 22 of the tube heater assembly 10 is charged. Provide protection to operators.
  • the upper tube 40 and the base 60 are preferably made of heat insulation and flame retardant materials.
  • the shapes of the upper cylinder 40 and the base 60 are not specifically limited.
  • the preferred embodiment of the upper cylinder 40 provided by the embodiment of the present invention is a cylinder, and the base 60 is a round base. Between the junction of the upper cylinder 40 and the base 60, a ring shape is further provided
  • the sealing ring 53 that is, the annular sealing ring 53 wraps around the bottom of the upper side 41 of the cylinder.
  • the bottom flange of the upper cylinder side can extend a circle of bottom flanges in the outward or inward direction. The bottom flange increases the contact area between the upper cylinder side 41 and the base 60, which can make the connection more stable and reliable.
  • a groove for accommodating the annular sealing ring 53 may be provided on the bottom surface of the bottom flange and the upper surface of the base 60, the upper part of the annular sealing ring 53 is embedded in the groove of the bottom flange, and the lower part is embedded in the corresponding groove of the base Better sealing effect. Further reducing the heat loss can further improve the heating efficiency.
  • the base 60 is also provided with a first positioning device 64.
  • the first positioning device 64 is used to determine the matching position of the tube heater assembly 10 and the base 60, so that the terminal contacts of the elastic connection piece 62 can be connected with the tube heater assembly 10
  • the electrode 222 on the outer tube 21 is contact-connected.
  • the first positioning device 64 can be provided by various existing methods, such as setting an eye-catching mark on the base, and when the outlet conduit 131 of the tube heater assembly 10 is facing the mark, it means that it has been positioned and the purpose is to realize the tube
  • the heater assembly 10 and the base 60 are positioned so as to realize the electrical connection between the elastic connection piece 62 and the electrode 222.
  • the first positioning device 64 is a baffle plate
  • the baffle plate can cause the tube heater assembly 10 to rotate along the lower groove 63 on the base 60 when the liquid outlet conduit 131 is in a corresponding position
  • the baffle is designed to realize the positioning of the base and the tube heater assembly 10.
  • the baffle can be further configured as an elastic baffle or a spring under the baffle. When the liquid discharge conduit 131 hits the baffle, it can continue to rotate until the elastic deformation of the baffle fixes the liquid discharge conduit 131. This design It further realizes a certain locking function for the tube heater assembly 10 and realizes more precise positioning.
  • a second positioning device 48 is also provided on the inner ring flange 45 of the ring face downward, and the second positioning device 48 is used to determine the matching position of the tube heater assembly 10 and the upper tube 40 to realize the first locking mechanism 46 and the first The positions of the two locking mechanisms 61 match.
  • the second positioning device 48 can be provided with an eye-catching mark on the torus 42 by various existing methods. When the liquid inlet conduit 121 of the tube heater assembly 10 is facing the mark, it means that the positioning has been performed. It is to realize the positioning of the tube heater assembly 10 and the upper tube 40, so as to realize the position matching of the first locking mechanism 46 and the second locking mechanism 61.
  • the second positioning device 48 is a baffle plate, which can cause the tube heater assembly 10 to rotate at the corresponding position when the upper tube 40 rotates along the upper groove 47
  • the baffle is designed to achieve the positioning of the upper tube 40 and the tube heater assembly 10.
  • the baffle can be further configured as an elastic baffle or a spring under the baffle. When the liquid inlet conduit 121 encounters the baffle, it can continue to rotate until the elastic deformation of the baffle fixes the liquid inlet conduit 121. This design It further realizes a certain locking function for the tube heater assembly 10 and realizes more precise positioning.
  • the first locking mechanism 46 and the second locking mechanism 61 can adopt the currently available locking technical solution.
  • the first locking mechanism 46 is a protrusion with a groove
  • the second locking mechanism 61 is Ring, sleeve the ring in the protruding groove to achieve locking.
  • the first locking mechanism 46 includes a buckle with a bayonet
  • the second locking mechanism 61 includes an elastic member clip with a protrusion.
  • the second locking mechanism 61 includes a buckle with a bayonet
  • the first locking mechanism 46 includes a resilient member clip with a protrusion.
  • the protrusion can be matched with the bayonet of the buckle to realize the locking function.
  • the protective device of the tubular thick film heater provided by the present invention, after the tubular heater assembly 10 is sheathed in the protective device, the feature of opening the protective device can be eliminated, that is, the design of the general tubular thick film heater It is reasonable and is not prone to failure. In case of occasional failure, it is basically in the overall replacement mode.
  • the first locking mechanism 46 provided in the embodiment of the present invention is set as a buckle with a bayonet
  • the buckle is set at all In the lower portion of the inner surface of the upper cylinder 40
  • the second locking mechanism 61 is a second locking mechanism 61 including a resilient member clip with a protrusion.
  • the elastic member clip is elastically deformed inwards.
  • the upper cylinder continues to press down and the protrusion of the clamp reaches the groove of the buckle, the two cooperate To achieve locking. Since the buckle of the first locking mechanism 46 is provided in the upper cylinder, it is no longer possible to disengage the locking buckle from the buckle, so this locking is one-time non-removable and can be placed without being disassembled by a technician The problem.
  • An installation fixing device 44 is also provided on the outer side wall of the upper tube 40.
  • the installation fixing device 44 is used to realize the fixed connection of the entire tube-type thick film heater and the protective casing.
  • the tube heater assembly 10 includes an inner tube 1, an outer tube 21, and an outer peripheral wall mounted on the outer tube 21
  • the heating element 20 on the upper side, the outer wall of the inner tube 1 is provided with a spiral guide structure 11, the outer tube 21 is sleeved outside the spiral guide structure 11, the spiral guide structure 11 and the outer circumference of the inner tube 1
  • the wall and the inner peripheral wall of the outer tube 21 together form a spiral flow path 14 through which the heated liquid passes.
  • the setting of the radial gap facilitates the inner tube 1 equipped with the helical flow guide structure 11 to be sleeved into the outer tube 21. This facilitates the flow of liquid in the flow channel 14 and facilitates the sufficient heating of the flowing liquid. It should be noted that, it can be understood that the inner tube 1 is generally centrally located inside the outer tube 21, and this radial clearance is equivalent to half of the difference between the inner circumferential diameter of the outer tube 21 and the outer diameter D of the spiral guide structure 11 One.
  • a flow channel 14 is formed between the inner tube 1 and the outer tube 21 where the spiral flow guiding structure 11 is arranged, and at least one end of the flow channel 14 is covered by a sealing end cap (both ends of the flow channel 14 in this embodiment) The openings are covered by sealed end caps).
  • a liquid inlet 12 and a liquid outlet 13 are provided on the cavity wall of the flow channel.
  • the sealed end cap is an annular sealed end cap 3, and the annular sealed end cap 3 includes an inner circular wall 31 and an outer circular wall 32 arranged concentrically, and an upper sealing surface 33 respectively connecting the upper part of the inner circular wall 31 and the upper part of the outer circular wall 32; And the lower sealing surface 34 connecting the lower part of the inner circular wall 31 and the lower part of the outer circular wall 32 respectively, the inner circular wall 31 is sealed and fixed to the end of the outer peripheral wall of the inner tube 1, and the outer circular wall 32 is sealed to the end of the inner peripheral wall of the outer tube 21 fixed.
  • the heating assembly 20 installed on the outer peripheral wall of the outer tube 21 heats the flowing liquid.
  • the heat generated by the heating assembly 20 passes through the outer tube 21 and exchanges heat with the liquid in the flow channel 14 to achieve the liquid Continuous heating, and the ring-shaped sealing end caps 3 all close the flow channel 14 formed by the inner tube 1 and the outer tube 21 by welding, so that the tube heater assembly 10 can withstand high temperature and high pressure environment.
  • the heated liquid flows out from the liquid outlet 13.
  • a water pump is arranged at the liquid inlet 12 to continuously deliver pressurized liquid into the spiral flow channel 14.
  • the technical solution of the present invention is to design the sealing end cap as an annular sealing end cap 3, the annular sealing end cap 3 includes only four faces, an inner circular wall 31 and an outer circular wall 32 that are concentrically disposed, and an upper sealing surface 33 and the lower sealing surface 34, the above four surfaces are all regular surfaces, and can be formed only by stamping or cutting processes. It is not like U-shaped seal end that requires multiple stamping and stretching to form. Therefore, the processing technology is extremely simplified, the processing control technology is simple, the processing cost is low, and the processing efficiency can be greatly improved.
  • the inner circular wall and the outer peripheral wall end of the inner tube are sealed by welding, and the outer circular wall and the inner peripheral wall end of the outer tube 21 are sealed by welding.
  • Laser welding or argon arc welding is preferred.
  • the range of the predetermined radial gap between the inner peripheral wall of the outer tube 21 and the spiral guide structure 11 is set to be no more than 1.0 mm, which is convenient for the inner tube 1 provided with the spiral guide structure 11 While being inserted into the outer tube 21, it also avoids that the radial gap is too large to cause the liquid to directly flow through the radial gap to the liquid outlet 13 along the length of the inner tube 1 without passing through the outer wall of the inner tube 1
  • the spiral diversion structure 11 conducts diversion and cannot fully heat the liquid; or the radial gap is too small, causing the liquid to stagnate in the spiral diversion structure 11 and receiving continuous heating of the heating assembly 20, causing Local overheating will result in the vaporization of the stagnant liquid at this point to produce steam discharge, which in turn will cause the liquid discharge from the liquid outlet 13 to be discontinuous and discharge with a large number of bubbles.
  • the embodiment provided by the present invention has been proved by a large number of experiments that when the radial gap is set in the range of 0.00mm-1.0mm, the liquid can be fully heated, the heating effect is good, and the liquid can be prevented from being overheated while ensuring The liquid flows smoothly, avoiding the generation of large bubbles.
  • the spiral diversion structure 11 is formed by a spiral metal wire sheathed on the inner tube 1, and the spiral metal wire is directly exposed to contact with the liquid.
  • the spiral metal wire should be selected not to be rusty and harmless to the human body Metal material. The phenomenon that, for example, the encapsulation glue made of silicone material blisters due to heat and aging and blocks the flow channel 14 is avoided, the service life of the heating device is improved, and the food safety is also improved.
  • the spiral metal wire is configured as a stainless steel wire, and the stainless steel wire is welded to the outer peripheral wall of the inner tube 1 to avoid noise generated by shaking in the flow channel 14.
  • the axial cross-sectional shape of the spiral wire is triangular, trapezoidal or rectangular, and the bottom edge of the triangular or trapezoid is welded to the outer peripheral wall of the inner tube 1.
  • the flow channel 14 formed in this way has a simple structure, is easy to produce, and guide Streaming performance is more stable.
  • both ends of the inner tube 1 and the outer tube 21 are flush with each other, which is convenient for laser welding to seal the inner circular wall of the ring-shaped end cap 3 and the outer peripheral wall of the inner tube 1, and the outer circular wall and the outer tube 21 The ends of the inner peripheral wall are sealed by laser welding.
  • both the inner tube 1 and the outer tube 21 are provided as stainless steel tubes.
  • the heating module 20 includes an insulating dielectric layer 211 disposed on the outer peripheral wall of the outer tube 21 and a heating circuit 22 disposed on the insulating dielectric layer 211.
  • the insulating medium is printed on the outer peripheral wall of the outer tube 21 In layer 211, the heat generated by the heating circuit 22 is used to exchange heat with the liquid flowing in the spiral flow path 14.
  • the wall thickness of the outer tube 21 ranges from 0.5 mm to 1 mm
  • the wall thickness of the inner tube 1 ranges from 0.3 mm to 1 mm.
  • the heating circuit 22 includes a plurality of heating resistors 221 and electrodes 222 fixed on the insulating dielectric layer 211. Both ends of the heating resistor 221 are electrically connected to the electrodes 222, so that the electrode 222 is connected to a power supply for The heating resistor 221 generates heat.
  • each heating resistor 221 coincides with the longitudinal direction of the outer tube 21, and a water pump (not shown) is connected to the liquid inlet 12.
  • the tube heater assembly 10 further includes a first temperature sensor 223, and a first controller electrically connected to the first temperature sensor 223 (eg, PCB board control in this embodiment), the first temperature sensor 223
  • the outer tube 21 is arranged at a position close to the liquid outlet 13. As can be seen from the figure, in this embodiment, the liquid outlet 13 is opened on the inner tube 1, the first temperature sensor 223 is as close as possible to the liquid outlet 13, and can be disposed on the outer tube 21 closest to the liquid outlet 13 Radial position.
  • the first temperature sensor 223 can approximately detect the liquid temperature of the liquid outlet 13 by detecting the temperature of the cylinder wall of the outer tube 21 close to the liquid outlet 13.
  • the PCB board controls according to the temperature information sent by the first temperature sensor 223 The pumping speed of the water pump and / or the heating power of the heating resistor 221.
  • the first temperature sensor 223 is disposed close to the liquid outlet 13 and is far away from the heating resistor 221 in the axial direction, so as to accurately detect the temperature of the liquid in the liquid outlet 13. In this way, the first temperature sensor 223 is used to detect the temperature of the liquid and feed it back to the PCB board.
  • the PCB board is compared with the temperature required by the user to set the liquid according to the measured liquid temperature data to automatically adjust the heating resistance 221 Heating power, or by controlling the water pump to adjust the flow rate of the liquid entering the flow channel 14, thereby achieving accurate control of the liquid temperature.
  • a plurality of heating resistors 221 are distributed around the outer peripheral wall of the outer tube 21, and preferably can be arranged approximately uniformly, so that the heating resistor 221 is directly opposite the flow channel 14 Liquid to transfer heat to the flowing liquid in time.
  • the tube heater assembly 10 further includes a second temperature sensor 224, and a second controller electrically connected to the second temperature sensor 224 (the second controller, for example, also uses the PCB board described in this embodiment Control), the second temperature sensor 224 is disposed on the outer tube 21 and is located near the heating resistor, used to detect the temperature of the outer tube where the second temperature sensor 224 is located, and the second controller (PCB board) is used to receive the second The temperature of the outer tube sent by the temperature sensor 224, and when the temperature of the outer tube is higher than the first preset temperature threshold within the first preset heating time period, the heating circuit 22 is controlled to be disconnected and / or an empty burn reminder is issued.
  • the second controller for example, also uses the PCB board described in this embodiment Control
  • the PCB board can control the heating circuit to open according to the temperature information of the outer tube sent by the second temperature sensor 224, and / or issue Remind message of temperature protection, so as to realize dry burning protection, to prevent the heating assembly 20 from being burned.
  • the first temperature-sensing sensor 223 and the second temperature-sensing sensor 224 are arranged along the length direction of the outer tube 21, which is convenient for the process of burning and laser trimming.
  • the second temperature sensor 224 may be disposed closer to the liquid outlet 13 relative to the liquid inlet 12, preferably, the first The temperature sensor 223 is disposed closer to the liquid outlet 13 than the second temperature sensor 224.
  • the power density of the heating resistor 221 close to the second temperature sensor 224 may be greater than the power density of the heating resistor circumferentially far from the second temperature sensor 224.
  • the second The controller (PCB board) is also used to receive the temperature of the outer tube from the second temperature sensor 224, and to control when the received temperature of the outer tube is higher than the second preset temperature threshold within the second preset heating time period
  • the heating circuit is open, and / or a warning message for scale protection is issued.
  • the specific scale detection principle is as follows: by making the working temperature (related to the power density) of the heating resistor 221 near the second temperature sensor 224 higher than the heating resistor 221 in other regions, the scale is firstly at the second temperature The periphery of the sensor 224 begins to accumulate, and the amount of scale accumulation will be more than that of other areas.
  • the heat resistance 221 continues to flow
  • the heat generated by the heating resistor 221 at the scale accumulation site cannot be transferred to the liquid longitudinally through the stainless steel outer tube 21 due to the presence of scale, thereby causing the temperature of the wall of the outer tube 21 at that place Increase, so the second temperature sensor 224 detects the temperature of the outer tube at this time and feeds it back to the PCB board, sends a message to remind the user that the scale needs to be cleaned, and controls the heating circuit to open to stop heating, which effectively prevents the buildup caused by scale
  • the heating resistor 221 is locally overheated, which may cause burnout.
  • the line width of the heating resistor around the second temperature sensor 224 can be reduced.
  • the second temperature sensor 224 has the function of integrated detection, which can realize the functions of anti-drying protection and scale detection reminder, and optimizes the function of the tube heater assembly 10.
  • the scale protection limit protection method is as follows:
  • the second temperature sensor 224 starts to detect the temperature of the outer tube, and the temperature of the outer tube and the second controller (such as used in this embodiment The above PCB board control) compares the preset second preset temperature threshold, and generates an execution command when the temperature of the outer tube reaches the second preset temperature threshold.
  • the electrode 222 is controlled to be disconnected according to the execution command, and an information reminder of the scale limit protection is issued to remind the user to clean the scale accumulated near the liquid outlet 13.
  • the temperature detected by the second temperature sensor 224 is 55 to 91 ° C, and as the heating time increases, the scale around the second temperature sensor 224 begins to accumulate scale.
  • the temperature of the heating resistor rises, and the heat generated by it is transferred laterally to the second temperature sensor 224, which detects the temperature of the outer tube at this time and feeds it back to the PCB board.
  • a preset protection threshold of 103 ° C is compared.
  • the PCB board controls to disconnect the power supply and prompts the scale limit protection to remind the user that the scale needs to be cleaned.
  • the liquid inlet 12 and the liquid outlet 13 are both provided on the inner tube 1, the liquid inlet conduit 121 is arranged at the position of the inner tube 1 corresponding to the liquid inlet 12, and the inner tube 1 corresponds to the liquid outlet A liquid outlet duct 131 is arranged at the position of 13, and at least the liquid inlet duct 121 is arranged obliquely with respect to the center line of the inner tube 1 so that the liquid can easily flow in.
  • the liquid inlet duct 121 and the liquid outlet duct 131 are installed in a cavity formed in the center of the inner tube 1.
  • the tube heater assembly 10 provided by the embodiment of the present invention has a simple sealed connection structure, low manufacturing cost, stable performance under high temperature and high pressure environment, long service life, stainless steel spiral flow channel 14 with high edible safety factor, stable outlet temperature, and The scale detection is increased, the life of the heating element is increased, and the value of application and promotion is high.

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Abstract

管式厚膜加热器保护装置，包括：上筒（40）：上筒（40）包括上筒侧面（41）及圆环面（42）；圆环面（42）的外环面与上筒侧面（41）上部一体连接，沿圆环面（42）的内环面（43）向下延伸出凸缘（45），凸缘（45）与上筒侧面（41）的内侧壁之间的空间构成上凹槽（47）；底座（60）：底座（60）设置有下凹槽（63），底座（60）上设置有弹性接电片（62），弹性接电片（62）的端子触点与电极（222）接触接通；底座（60）设有接线端子（65），接线端子（65）电性连接弹性接电片（62），接线端子（65）外接供电电源。具有保护功能的管式厚膜加热器，避免外界环境对管式加热器组件（10）发热电路（22）表面的影响，从而影响加热效率，保护加热器，也避免了管式加热器组件（10）在工作过程中，其发热电路（22）表面带电可能造成的触电事故，对操作人员提供保护。

Description

管式厚膜加热器保护装置及管式厚膜加热器 技术领域
本发明涉及液体加热器的技术领域，尤其涉及对管式厚膜加热器进行保护的保护装置，以及具有保护功能的管式厚膜加热器。
背景技术
管式厚膜加热器在应用中，需要和外界实现电连接和控制；加热器在工作时，发热电阻表面带电，工作温度高，需要和外界进行安全防护和隔热。
然而，现有的管式厚膜加热器仅仅是在管式加热器组件的外面安装保护外壳进行保护，并不能很好地实现管式厚膜加热器工作时与外部进行电和热的隔绝，具有一定的危险性。
发明内容
针对现有管式厚膜加热器在工作时存在的没有很好进行隔绝保护的问题，本发明的目的在于提供管式厚膜加热器保护装置，用于为管式加热器组件提供保护。
本发明实施例提供的管式厚膜加热器保护装置，采用如下技术方案实现：
管式厚膜加热器保护装置，用于为管式加热器组件提供保护，包括：
上筒：所述上筒包括内空设置的上筒侧面及圆环面；所述圆环面的外环面与所述上筒侧面上部一体连接，所述圆环面的内环面半径小于管式加热器组件内管内侧面的半径；沿所述圆环面的内环面向下延伸出凸缘，所述凸缘与所述上筒侧面的内侧壁之间的空间构成容置管式加热器组件上部的上凹槽；所述上筒侧面下部设置有第一锁紧机构；
底座：所述底座的中部设有供管式加热器组件的出液导管伸出的圆孔，为了加热器表面不受外界环境的影响，所述底座还设置有下凹槽，所述下凹槽的内侧面半径小于所述管式加热器组件内管内侧面的半径，所述下凹槽的外侧面半径大于所述管式加热器组件外管外侧面的半径；所述底座上设置有弹性接电片，在管式加热器组件下部安装在所述下凹槽上时，所述弹性接电片的端子触点可与管式加热器组件外管上的电极接触接通；所述底座侧壁或者底部设有接线端子，所述接线端子电性连接所述弹性接电片，所述接线端子可外接供电电源；所述底座上设有与第一锁紧机构匹配锁紧的第二锁紧机构。一种实现方式中，弹性接电片向下延伸至接线端子，从而实现与接线端子的电性连接。
本发明实施例提供的管式厚膜加热器保护装置，通过上筒与底座的配合，将管式加热器组件套设在上筒和底座形成的密封空间内，实现了管式加热器组件发热电路表面和外界空气的相对隔绝。从而既避免外界环境对管式加热器组件发热电路表面的影响，从而影响加热效率，保护加热器，也避免了管式加热器组件在工作过程中，其发热电路表面带电可能造成的触电事故，对操作人员提供保护。
进一步，上筒和底座优选隔热阻燃材料制成，选用阻燃PP或PE。
优选地，还包括设置在上凹槽内的第一环形凹槽密封圈和设置在下凹槽内的第二环形凹槽密封圈，所述第一环形凹槽密封圈的凹槽宽度与管式加热器组件上部的宽度匹配，所述第二环形凹槽密封圈的凹槽宽度与管式加热器组件下部的宽度匹配。通过设置第一环形凹槽密封圈和第二环形凹槽密封圈，实现管式加热器组件与上凹槽和下凹槽的密封连接，从而避免外界环境对加热器表面的影响，减少热量的损耗，提升加热效率。
进一步地，所述上筒为圆筒，所述底座为圆底座，还包括设置在圆底座上的环形密封圈，所述环形密封圈设置在圆筒与圆底座的结合部。通过设置环形密封圈，实现上筒和底座的密封连接，避免外界环境对加热器表面的影响，进一步减少热量的损耗，可进一步提升加热效率。进一步地，所述底座上设置有第一定位装置，所述第一定位装置用于确定管式加热器组件与底座的匹配位置，使得所述弹性接电片的端子触点可与管式加热器组件外管上的电极接触接通。通过第一定位装置可确定管式加热器组件与底座的相对位置，如将管式加热器组件的进液导管与第一定位装置对齐来实现管式加热器组件与底座的定位。当管式加热器组件与底座处于此定位时，弹性接电片的端子触点可正好实现与管式加热器组件外管上的电极接触接通。
进一步地，所述圆环面向下内环凸缘上设置第二定位装置，所述第二定位装置用于确定管式加热器组件与上筒的匹配位置，实现第一锁紧机构与第二锁紧机构的位置匹配。
优选地，所述第一锁紧机构包括具有卡口的卡扣，所述第二锁紧机构包括具有突起的弹性部件卡子，通过所述卡子的突起可与所述卡扣的卡口匹配实现锁紧功能；
或者：
所述第二锁紧机构包括具有卡口的卡扣，所述第一锁紧机构包括具有突起的弹性部件卡子，通过所述卡子的突起可与所述卡扣的卡口匹配实现锁紧功能。
优选地，当所述第一锁紧机构为具有卡口的卡扣时，所述卡扣设置在所述上筒内侧面下部。
优选地，在所述上筒的外侧壁上设置安装固定装置。安装固定装置用于实 现整个管式厚膜加热器与保护外壳的固定连接。
本发明实施例还提供具有保护功能的管式厚膜加热器，包括如上述的管式厚膜加热器保护装置，还包括管式加热器组件；所述管式加热器组件上部套设在所述上凹槽内，所述加热器组件下部套设在所述下凹槽内；
管式加热器组件，包括：
内管，内管的外周壁配置有螺旋状导流结构；
外管，外管套设在螺旋状导流结构的外部；外管的外周壁上设有加热组件；外管的内周壁与螺旋状导流结构之间相隔预定的径向间隙；
内管与外管之间形成流道，流道的至少一端开口由密封端盖封盖；流道的腔壁上设置有进液口和出液口；
密封端盖为环形密封端盖，环形密封端盖包括同圆心设置的内圆壁和外圆壁，以及分别连接内圆壁上部和外圆壁上部的上密封面；和分别连接内圆壁下部和外圆壁下部的下密封面，内圆壁与内管的外周壁端头密封固定，外圆壁与外管的内周壁端头密封固定。
本发明实施例提供的具有保护功能的管式厚膜加热器，通过上筒与底座的配合，将管式加热器组件套设在上筒和底座形成的密封空间内，实现了管式加热器组件发热电路表面和外界空气的相对隔绝。从而既避免外界环境对管式加热器组件发热电路表面的影响，从而影响加热效率，保护加热器，也避免了管式加热器组件在工作过程中，其发热电路表面带电可能造成的触电事故，对操作人员提供保护。
本发明的技术方案还通过对密封端盖进行重新设计，改变了U形密封端的设计，而设计为环形密封端，环形密封端盖只包括了四个面，分别为同圆心设 置的内圆壁和外圆壁，以及上密封面和下密封面，上述四个面都是规则的面，只需要通过冲压或者切割工艺就可以成型。而不像U形密封端面那样需要多次冲压、拉伸才能成型。因此加工工艺极为简化，加工控制工艺简单，加工成本低，而加工效率却可以得到极大提升。本发明提供的管式加热器组件中的环形密封端盖，达到的密封效果和采用U形密封端盖的效果一样好。
根据本发明管式加热器组件的设计要求，环形密封端盖可以放置在内管外周壁和外管内周壁之间，从而通过焊接等方式实现内圆壁与内管外周壁端头之间的焊接密封固定，以及外圆壁与外管内周壁端头之间的焊接密封固定。其中，焊接方式优选激光焊或者氩弧焊，可以使得焊接的端口平整光滑。
进一步地，所述预定的径向间隙的范围为不大于1.0mm。
进一步地，所述螺旋状导流结构由套设在所述内管上的螺旋金属丝形成。
进一步地，所述螺旋金属丝为不锈钢丝，所述不锈钢丝与所述内管的外周壁焊接在一起；并且/或者，所述螺旋金属丝的轴向截面形状为三角形或者梯形或者矩形，并且/或者，所述内管的两端与所述外管的两端分别相平齐。
进一步地，所述内管与所述外管均为不锈钢管，所述密封端盖为不锈钢端盖。
进一步地，所述加热组件包括：所述加热组件包括：配置于所述外管的外周壁上的绝缘介质层，及配置于所述绝缘介质层上的发热电路，所述发热电路包括固定于所述绝缘介质层上的多个发热电阻与电极，所述发热电阻的两端分别与所述电极电性连接。
进一步地，各所述发热电阻的延伸方向与所述外管的长度方向一致；所述进液口连接有水泵；所述发热电路还包括第一温感传感器，以及与所述第一温感传感器电连接的第一控制器；所述第一温感传感器配置于所述外管的靠近所 述出液口的位置处，所述第一控制器用于根据所述第一温感传感器发出的温度信息，控制所述水泵进液的速度和/或所述发热电阻的加热功率。
进一步地，多个所述发热电阻绕所述外管的外周壁分布；该管式加热器组件还包括第二温感传感器、以及与所述第二温感传感器电连接的第二控制器；所述第二温感传感器设置在所述外管上并靠近所述发热电阻设置，用于检测其所处位置的外管温度；所述第二控制器用于接收所述第二温感传感器发出的外管温度，并当所述外管温度在第一预设加热时间段内高于第一预设温度阈值时，控制所述发热电路断路并且/或者发出空烧提醒信息。
进一步地，所述第二温感传感器还靠近所述出液口设置，且靠近所述第二温感传感器的所述发热电阻的功率密度大于周向远离所述第二温感传感器的发热电阻的功率密度；所述第二控制器还用于当接收到的所述外管温度在第二预设加热时间段内高于第二预设温度阈值时/或工作中高于第二预设温度阈值时，控制所述发热电路断路并且/或者发出超温保护的提醒信息。
进一步地，所述进液口和所述出液口均设置在所述内管上，所述内管对应所述进液口的位置配置有进液导管，所述内管对应所述出液口的位置配置有出液导管，至少所述进液导管相对于所述内管的中心线倾斜地布置。
进一步地，设置在不锈钢管上的发热电阻通过不锈钢钢管正对于螺旋状导流结构上。发热电阻正对外管内壁在液体流道内，可以达到更好的加热效果。
相比现有技术，本发明的有益效果在于：通过密封端盖将内管与外管形成流道的端部进行密封连接，具体通过密封端盖扣合在内外管的端部后再通过其上的第一翻边及第二翻边与内外管进行焊接，将密封连接结构独立出来加工的方式，便于制造，避免了内管外翻边的复杂工艺，易于实现批量生产，降低了制造成本，且密封效果较好，提高了加热装置长期承受高温高压环境的稳定性 能。
附图说明
图1为本发明实施例提供的一种具有保护功能管式厚膜加热器的爆炸结构示意图；
图2为图1的立体结构示意图；
图3为图2的俯视结构示意图；
图4为图3中B-B向的剖视图；
图5为图3中C-C向的剖视图；
图6为管式加热器组件爆炸结构示意图；
图7为图6的立体结构示意图；
图8为图7的俯视结构示意图；
图9为环形密封端盖结构示意图；
图10为图8中A-A向的剖视图。
图中：10、管式加热器组件；1、内管；11、螺旋状导流结构；12、进液口；121、进液导管；13、出液口；131、出液导管；14、流道；20、加热组件；21、外管；211、绝缘介质层；22、发热电路；221、发热电阻；222、电极；223、第一温感传感器；224、第二温感传感器；3、环形密封端盖；31、内圆壁；32、外圆壁；33、上密封面；34、下密封面；40、上筒；41、上筒侧面；42、圆环面；43、内环面；44、安装固定装置；45、凸缘；46、第一锁紧机构；47、上凹槽；48、第二定位装置；51、第一环形凹槽密封圈；52、第二环形凹槽密封圈；53、环形密封圈；60、底座；61、第二锁紧机构；62、弹性接电片；63、下凹槽；64、第一定位装置；65、接线端子；70、密封空间。
具体实施方式
下面结合附图以及具体实施方式，对本发明做进一步描述，需要说明的是，在不相冲突的前提下，以下描述的各实施例之间或各技术特征之间可以任意组合形成新的实施例。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”“上”、“下”、“前”、“后”、“左”、“右”、“水平”、“竖直”、“顶”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。
本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接连接，也可以通过中间媒介间接相连，或是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
如图1至图5所示，本发明实施例提供的一种具有保护功能的管式厚膜加热器，包括管式厚膜加热器保护装置和管式加热器组件10。管式加热器组件10上部套设在上筒40的上凹槽47内，管式加热器组件10下部套设在底座60的下凹槽63内。进一步地，管式加热器组件10的上部首先套设在第一环形凹槽密封圈51的凹槽内，再将第一环形凹槽密封圈51套设在上凹槽47内；管式加热器组件10的下部首先套设在第二环形凹槽密封圈52的凹槽内，再将第二环形凹槽密封圈52套设在下凹槽63内。通过在管式加热器组件10的上部和下部套设第一环形凹槽密封圈51和第二环形凹槽密封圈52，可以使得管式加热器组 件10与管式厚膜加热器保护装置之间连接更加紧密，使得由管式加热器组件10发热电路22表面、上筒40及底座60所组成一个相对隔绝的密封空间70更加绝密，减少外界空气对发热电路22表面的影响，也减少密封空间70的热量损耗，提升加热效率。
其中，管式厚膜加热器保护装置，用于为管式加热器组件10提供保护，包括：
上筒40：上筒40包括内空设置的上筒侧面41及圆环面42；圆环面42的外环面与上筒侧面41上部一体连接，圆环面42的内环面43半径小于管式加热器组件10内管1内侧面的半径；沿圆环面42的内环面43向下延伸出凸缘45，凸缘45与上筒侧面41的内侧壁之间的空间构成容置管式加热器组件10上部的上凹槽47；上筒侧面41下部设置有第一锁紧机构46；
底座60：底座60的中部设有供管式加热器组件10的出液导管131伸出的圆孔，底座60还设置有下凹槽63，下凹槽63的内侧面半径小于管式加热器组件10内管1内侧面的半径，下凹槽63的外侧面半径大于管式加热器组件10外管21外侧面的半径；底座60上设置有弹性接电片62，在管式加热器组件10下部安装在下凹槽63上时，弹性接电片62的端子触点可与管式加热器组件10外管21上的电极222接触接通；底座60侧壁或者底部设有接线端子65，接线端子65电性连接弹性接电片62，接线端子65可外接供电电源；底座60上设有与第一锁紧机构46匹配锁紧的第二锁紧机构61。接线端子65可以直接设置电源线，通过电源线连接插座，从而实现供电。接线端子也可以设置为电源插孔，通过配套接口的电源线实现电源供电。
本发明实施例提供的管式厚膜加热器保护装置，通过上筒40与底座60的 配合，将管式加热器组件10套设在上筒40和底座60形成的密封空间70内，实现了管式加热器组件10发热电路22表面和外界空气的相对隔绝。从而既避免外界环境对管式加热器组件10发热电路22表面的影响，从而影响加热器，也避免了管式加热器组件10在工作过程中，其发热电路22表面带电可能造成的触电事故，对操作人员提供保护。
其中，上筒40和底座60优选隔热阻燃材料制成。上筒40和底座60的形状没有具体的限制，本发明实施例提供的上筒40优选实施方式为圆筒，底座60为圆底座，在上筒40和底座60的结合部间，进一步设置环形密封圈53，即该环形密封圈53绕上筒侧面41底部一周。进一步地，上筒侧面下部向外的方向或者向内的方向可以延伸出一圈底部凸缘，底部凸缘增大了上筒侧面41与底座60的接触面积，可以使得连接更为稳定可靠。同时还可以在底部凸缘的底面和底座60上表面对应位置均设置容纳环形密封圈53的凹槽，环形密封圈53的上部嵌入底部凸缘凹槽内，下部嵌入底座相应凹槽内，实现更好的密封效果。进一步减少热量的损耗，可进一步提升加热效率。
底座60上还设置有第一定位装置64，第一定位装置64用于确定管式加热器组件10与底座60的匹配位置，使得弹性接电片62的端子触点可与管式加热器组件10外管21上的电极222接触接通。第一定位装置64可以通过现有的各种方式，如在底座上设置醒目的标识，当管式加热器组件10的出液导管131正对该标识时，即说明已经定位，目的是实现管式加热器组件10与底座60的定位，从而实现弹性接电片62与电极222的电性连接。本发明一种优选实施例中，第一定位装置64为一挡片，该挡片可以使得管式加热器组件10在底座60上沿下凹槽63旋转时，出液导管131在相应位置被挡片挡住，则被设计为实现了底座与管式加热器组件10的定位。挡片可进一步设置为弹性挡片或者在挡片下设 置弹簧，当出液导管131碰到挡片时，可以继续旋转，一直到挡片的弹性形变固定住出液导管131为止，这种设计进一步实现了对管式加热器组件10一定的锁定功能，实现更精准的定位。
圆环面向下内环凸缘上45上还设置第二定位装置48，第二定位装置48用于确定管式加热器组件10与上筒40的匹配位置，实现第一锁紧机构46与第二锁紧机构61的位置匹配。第二定位装置48可以通过现有的各种方式，如在圆环面42上设置醒目的标识，当管式加热器组件10的进液导管121正对该标识时，即说明已经定位，目的是实现管式加热器组件10与上筒40的定位，从而实现第一锁紧机构46与第二锁紧机构61的位置匹配。本发明一种优选实施例中，第二定位装置48为一挡片，该挡片可以使得管式加热器组件10在上筒40沿上凹槽47旋转时，进液导管121在相应位置被挡片挡住，则被设计为实现了上筒40与管式加热器组件10的定位。挡片可进一步设置为弹性挡片或者在挡片下设置弹簧，当进液导管121碰到挡片时，可以继续旋转，一直到挡片的弹性形变固定住进液导管121为止，这种设计进一步实现了对管式加热器组件10一定的锁定功能，实现更精准的定位。
其中，第一锁紧机构46和第二锁紧机构61可以采用现有可实现的锁紧技术方案，如设置第一锁紧机构46为设有凹槽的突起，第二锁紧机构61为圆环，将圆环套设在突起的凹槽中，实现锁定。本发明提供的优选实施方式中，如图4所示，第一锁紧机构46包括具有卡口的卡扣，第二锁紧机构61包括具有突起的弹性部件卡子，通过卡子的突起可与卡扣的卡口匹配实现锁紧功能；根据同样的作用原理，可以设置为第二锁紧机构61包括具有卡口的卡扣，第一锁紧机构46包括具有突起的弹性部件卡子，通过卡子的突起可与卡扣的卡口匹配实现锁紧功能。
针对本发明提供的管式厚膜加热器的保护装置，在将管式加热器组件10套设在保护装置中后，可以不用在打开该保护装置的特点，即一般管式厚膜加热器设计合理，不太容易出现故障，在偶尔出现故障时，也基本是整体替换的模式下，本发明实施例提供的第一锁紧机构46设为具有卡口的卡扣时，卡扣设置在所述上筒40内侧面下部，第二锁紧机构61为第二锁紧机构61包括具有突起的弹性部件卡子。在上筒40和底座60的锁紧过程中，通过下压上筒，使得弹性部件卡子向内产生弹性形变，当上筒继续下压，卡子的突起到达卡扣的凹槽时，两者配合，实现锁紧。由于第一锁紧机构46的卡扣设置在上筒里面的，已经没法使锁紧扣子与卡扣脱离，因此这种锁紧是一次性不可拆卸的，可以放在不是技术人员随意拆卸造成的问题。
在上筒40的外侧壁上还设置安装固定装置44。安装固定装置44用于实现整个管式厚膜加热器与保护外壳的固定连接。
请参照图6-10所示，示出了本发明实施例提供的管式加热器组件10的结构，该管式加热器组件10包括内管1、外管21及安装在外管21的外周壁上的加热组件20，该内管1的外周壁配置有螺旋状导流结构11，外管21套设在螺旋状导流结构11的外部，该螺旋状导流结构11与内管1的外周壁及外管21的内周壁共同围成供被加热液体通过的螺旋形的流道14。外管21的内周壁与螺旋状导流结构11之间相隔预定的径向间隙，该径向间隙的设置便于将配置有螺旋状导流结构11的内管1套入外管21内，还利于液体在流道14内的流动，便于对流动的液体进行充分加热。需要说明的是，可以理解，内管1大体居中的位于外管21内部，该径向间隙相当于外管21内周直径与螺旋状导流结构11的外径D之差值的二分之一。这样，在配置有螺旋状导流结构11的内管1与外管21之间形成流道14，该流道14的至少一端开口由密封端盖封盖(本实施例中流道 14的两端开口均由密封端盖封盖)。并且，该流道的腔壁上设置有进液口12和出液口13。密封端盖为环形密封端盖3，环形密封端盖3包括同圆心设置的内圆壁31和外圆壁32，以及分别连接内圆壁31上部和外圆壁32上部的上密封面33；和分别连接内圆壁31下部和外圆壁32下部的下密封面34，内圆壁31与内管1的外周壁端头密封固定，外圆壁32与外管21的内周壁端头密封固定。
这样，待加热液体从进液口12处进入由螺旋状导流结构11与内管1的外周壁及外管21的内周壁形成的流道14内后，待加热液体沿着流道14流动的同时，安装在外管21的外周壁上的加热组件20会对流动的液体进行加热，该加热组件20产生的热量通过外管21后与流道14内的液体进行热量交换，以实现对液体的连续加热，而且环形密封端盖3均通过焊接的方式封闭了由内管1与外管21形成的流道14，使得该管式加热器组件10能承受高温高压的环境。最后，经加热后的液体从出液口13流出。优选地，进液口12处会配置有水泵，以向螺旋形的流道14内不断地输送加压液体。
本发明的技术方案通过将密封端盖设计为环形密封端盖3，环形密封端盖3只包括了四个面，分别为同圆心设置的内圆壁31和外圆壁32，以及上密封面33和下密封面34，上述四个面都是规则的面，只需要通过冲压或者切割工艺就可以成型。而不像U形密封端面那样需要多次冲压、拉伸才能成型。因此加工工艺极为简化，加工控制工艺简单，加工成本低，而加工效率却可以得到极大提升。
优选地，根据本发明管式加热器组件10的设计要求，内圆壁与内管的外周壁端头通过焊接密封，外圆壁与所述外管21的内周壁端头通过焊接密封。优选激光焊或者氩弧焊。
作为优选的实施方式，外管21的内周壁与螺旋状导流结构11之间预定的 径向间隙的范围设置为不大于1.0mm，便于将配置有螺旋状导流结构11的内管1轻松套入外管21内的同时，还避免了因径向间隙过大而导致液体直接通过该径向间隙沿着内管1的长度方向流至出液口13，而不通过内管1外周壁上的螺旋状导流结构11进行导流，对液体不能充分加热；或者因径向间隙太小，造成液体在螺旋状导流结构11内停滞不前，并且接受加热组件20的持续加热，造成局部过热，结果会导致该处停滞不前的液体发生汽化产生蒸汽排出，进而造成出液口13的出液不连续并夹杂着大量气泡排出。本发明提供的实施例经过大量实验证明，当将该径向间隙设置在0.00mm-1.0mm的范围内时，既能实现液体的充分加热，加热效果良好，还能避免液体过加热的同时保证液体的流动顺畅，避免产生大的气泡。
优选地，该螺旋状导流结构11由套设在内管1上的螺旋金属丝形成，螺旋金属丝直接裸露与液体接触，可以理解，该螺旋金属丝应选不易生锈且对人体无害的金属材质。避免了例如硅胶材质的包裹胶因受热老化鼓泡，阻塞流道14的现象，提高了加热装置的使用寿命，并且还提高了食用安全。
作为优选的实施方式，螺旋金属丝配置为不锈钢丝，不锈钢丝与内管1的外周壁焊接在一起，避免在流道14内晃动产生噪音。并且/或者，螺旋金属丝的轴向截面形状为三角形或者梯形或者矩形，将三角形或者梯形的底边焊接在内管1的外周壁上，这样形成的流道14结构简单，便于生产，而且导流性能更稳定。并且，内管1和外管21的两端分别平齐，便于环形密封端盖3的内圆壁与内管1的外周壁端头使用激光焊焊接密封，以及外圆壁与外管21的内周壁端头进行激光焊焊接密封。
优选地，为进一步提高食用的安全性，内管1与外管21均设置为不锈钢管。
另外，如图7所示，加热组件20包括配置于外管21的外周壁上的绝缘介 质层211及配置于绝缘介质层211上的发热电路22，在外管21的外周壁上印烧绝缘介质层211，该发热电路22产生的热量用于对螺旋形流道14内流动的液体进行热交换。优选地，外管21的壁厚范围为0.5mm-1mm，内管1的壁厚范围为0.3mm-1mm。
优选地，该发热电路22包括固定于绝缘介质层211上的多个发热电阻221与电极222，发热电阻221的两端分别与电极222电性连接，这样，在电极222处接入电源，供该发热电阻221产生热量。
优选地，各发热电阻221的延伸方向与外管21的长度方向一致，进液口12连接有水泵(图中未示出)。该管式加热器组件10还包括第一温感传感器223，以及与第一温感传感器223电连接的第一控制器(例如本实施例中采用PCB板控制)，该第一温感传感器223配置于外管21的靠近出液口13的位置处。由图中可以看出，本实施例中出液口13开设在内管1上，该第一温感传感器223为尽量靠近出液口13，可以设置在外管21的离出液口13最近的径向位置处。第一温感传感器223通过检测靠近出液口13的外管21的筒壁温度，即可近似检测出液口13的液体温度，该PCB板根据第一温感传感器223发出的温度信息，控制水泵进液的速度和/或发热电阻221的加热功率。优选地，该第一温感传感器223设置在靠近出液口13的位置的同时并且尽量在轴向上远离发热电阻221，以便于准确检测出液口13液体的温度。这样，该第一温感传感器223用于检测出液的温度并反馈至PCB板，该PCB板根据实测的出液温度数据与用户设定出液所需温度进行比较，以自动调节发热电阻221的加热功率，或者通过控制水泵以调节进入流道14内液体的流速，进而实现对出液温度的准确控制。
为便于对螺旋状流道14内的液体进行均匀地加热，多个发热电阻221绕外管21的外周壁分布设置，优选地可近似均匀的分布设置，使得发热电阻221正 对流道14内的液体，以向流动的液体及时传递热量。另外，该管式加热器组件10还包括第二温感传感器224，以及与第二温感传感器224电连接的第二控制器(该第二控制器例如同样采用本实施例中上述的PCB板控制)，该第二温感传感器224设置在外管21上并靠近发热电阻设置，用于检测第二温感传感器224所在位置的外管温度，第二控制器(PCB板)用于接收第二温感传感器224发出的外管温度，并当该外管温度在第一预设加热时间段内高于第一预设温度阈值时，控制发热电路22断路并且/或者发出空烧提醒信息。这是因为，当流道14内没有液体时，发热电阻221产生的热量不能通过外管壁传递给液体散热，导致外管壁在短时间内(即第一预设加热时间段内)快速升温(高于第一预设温度阈值)或工作中高于第二预设温度阈值时，PCB板即可根据第二温感传感器224发来的外管温度信息控制发热电路断路，并且/或者发出超温保护的提醒信息，从而实现干烧保护，避免加热组件20不被烧毁。优选地，第一温感传感器223与第二温感传感器224沿外管21的长度方向排列设置，便于烧印及激光修调工序。
作为优选的实施方式，由于出液口13处液体温度最高，水垢集结的速度更快，可以将第二温感传感器224相对于进液口12更靠近出液口13设置，优选地，第一温感传感器223相对于第二温感传感器224更靠近出液口13设置。为实现水垢的靶向聚集，可以使靠近第二温感传感器224的发热电阻221的功率密度大于周向远离第二温感传感器224的发热电阻的功率密度，在非干烧情况下，第二控制器(PCB板)还用于接收第二温感传感器224发出的外管温度，并当接收到的外管温度在第二预设加热时间段内高于第二预设温度阈值时，控制发热电路断路，并且/或者发出水垢极限保护的提醒信息。
具体的水垢检测原理如下所述：通过使该第二温感传感器224附近的发热 电阻221的工作温度(跟功率密度有关)高于其它区域的发热电阻221，从而使得水垢首先在该第二温感传感器224的周边开始集结，并且水垢的集结量会多于其它区域的水垢集结量，当水垢集结达到一定程度后，由于水垢的热阻大，即导热系数小，在发热电阻221持续给流道14内液体传递热量的时候，会由于水垢的存在导致集结水垢处的发热电阻221所产生的热量不能通过不锈钢外管21纵向传递给液体，进而导致该处的外管21的筒壁的温度升高，于是，第二温感传感器224检测到此时的外管温度并反馈给PCB板，发出提醒用户需要清理水垢的信息，及控制发热电路断路以停止加热，有效预防了因水垢集结导致发热电阻221局部过热而导致烧毁的风险。如图2所示，要实现发热电阻功率密度的增大，可通过减小第二温感传感器224周边发热电阻的线条宽度。这样，该第二温感传感器224具有集成检测的功能，可实现防干烧保护及水垢检测提醒的功能，优化了该管式加热器组件10的功能。
具体地，水垢检测极限保护的方法，如下：
S1，在管式加热器组件10开始加热液体后(非干烧状态下)，第二温感传感器224开始检测外管温度，将该外管温度与第二控制器(例如本实施例中采用上述PCB板控制)预设的第二预设温度阈值进行比较，在外管温度达到第二预设温度阈值时产生执行命令。
S2，根据所述执行命令控制电极222断开，并发出水垢极限保护的信息提醒，提醒用户清理出液口13附近集结的水垢。
例如出液口13的出液温度在60～98℃时，第二温感传感器224检测到的温度为55～91℃，随着加热时间的增加，第二温感传感器224周边开始集结水垢，随着水垢的增加，当水垢集结到一定程度时，发热电阻温度升高，其产生的热量横向传递到第二温感传感器224，检测到此时外管温度并反馈给PCB板，与 PCB板预设的例如103℃保护阈值进行比较，当该外管温度大于103℃时，PCB板控制断开电源并提示水垢极限保护，提醒用户需要清洗水垢。
优选地，如图4所示，进液口12和出液口13均设置在内管1上，内管1对应进液口12的位置配置有进液导管121，内管1对应出液口13的位置配置有出液导管131，至少进液导管121相对于内管1的中心线倾斜地布置，使得液体便于流入。另外，为便于安装进液导管121及出液导管131，该进液导管121及出液导管131安装于内管1中心形成的空腔中。
本发明实施例提供的管式加热器组件10，其密封连接形式结构简单，制造成本低，高温高压环境下性能稳定使用寿命长，不锈钢螺旋状流道14食用安全系数高，出水温度稳定，而且增加了水垢检测，提高了加热元件的寿命，具有较高地应用推广价值。
上述实施方式仅为本发明的优选实施方式，不能以此来限定本发明保护的范围，本领域的技术人员在本发明的基础上所做的任何非实质性的变化及替换均属于本发明所要求保护的范围。

Claims (21)

  1. 管式厚膜加热器保护装置，用于为管式加热器组件提供保护，其特征在于，包括：
    上筒：所述上筒包括内空设置的上筒侧面及圆环面；所述圆环面的外环面与所述上筒侧面上部一体连接，所述圆环面的内环面半径小于管式加热器组件内管内侧面的半径；沿所述圆环面的内环面向下延伸出凸缘，所述凸缘与所述上筒侧面的内侧壁壁之间的空间构成容置管式加热器组件上部的上凹槽；所述上筒侧面下部设置有第一锁紧机构；
    底座：所述底座的中部设有供管式加热器组件的出液导管伸出的圆孔，所述底座还设置有下凹槽，所述下凹槽的内侧面半径小于所述管式加热器组件内管内侧面的半径，所述下凹槽的外侧面半径大于所述管式加热器组件外管外侧面的半径；所述底座上设置有弹性接电片，在管式加热器组件下部安装在所述下凹槽上时，所述弹性接电片的端子触点可与管式加热器组件外管上的电极接触接通；所述底座侧壁或者底部设有接线端子，所述接线端子电性连接所述弹性接电片，所述接线端子可外接供电电源；所述底座上设有与第一锁紧机构匹配锁紧的第二锁紧机构。
  2. 如权利要求1所述的管式厚膜加热器保护装置，其特征在于，还包括设置在上凹槽内的第一环形凹槽密封圈和设置在下凹槽内的第二环形凹槽密封圈，所述第一环形凹槽密封圈的凹槽宽度与管式加热器组件上部的宽度匹配，所述第二环形凹槽密封圈的凹槽宽度与管式加热器组件下部的宽度匹配。
  3. 如权利要求1所述的管式厚膜加热器保护装置，其特征在于，所述上筒为圆筒，所述底座为圆底座，还包括设置在圆底座上的环形密封圈，所述环形密封圈设置在圆筒与圆底座的结合部。
  4. 如权利要求3所述的管式厚膜加热器保护装置，其特征在于，所述底座上设置有第一定位装置，所述第一定位装置用于确定管式加热器组件与底座的匹配位置，使得所述弹性接电片的端子触点可与管式加热器组件外管上的电极接触接通。
  5. 如权利要求4所述的管式厚膜加热器保护装置，其特征在于，所述圆环面向下内环凸缘上设置第二定位装置，所述第二定位装置用于确定管式加热器组件与上筒的匹配位置，实现第一锁紧机构与第二锁紧机构的位置匹配。
  6. 如权利要求1至5任一所述的管式厚膜加热器保护装置，其特征在于，所述第一锁紧机构包括具有卡口的卡扣，所述第二锁紧机构包括具有突起的弹性部件卡子，通过所述卡子的突起可与所述卡扣的卡口匹配实现锁紧功能；
    或者：
    所述第二锁紧机构包括具有卡口的卡扣，所述第一锁紧机构包括具有突起的弹性部件卡子，通过所述卡子的突起可与所述卡扣的卡口匹配实现锁紧功能。
  7. 如权利要求6所述的管式厚膜加热器保护装置，其特征在于，当所述第一锁紧机构为具有卡口的卡扣时，所述卡扣设置在所述上筒内侧面下部。
  8. 如权利要求7所述的管式厚膜加热器保护装置，其特征在于，在所述上筒的外侧壁上设置安装固定装置。
  9. 管式厚膜加热器，其特征在于，包括：
    内管，所述内管的外周壁配置有螺旋状导流结构；
    外管，所述外管套设在所述螺旋状导流结构的外部；所述外管的外周壁上设有加热组件；所述外管的内周壁与所述螺旋状导流结构之间相隔预定的径向 间隙；
    所述内管与所述外管之间形成流道，所述流道的至少一端开口由密封端盖封盖；所述流道的腔壁上设置有进液口和出液口；
    所述密封端盖为环形密封端盖，所述环形密封端盖包括同圆心设置的内圆壁和外圆壁，以及分别连接所述内圆壁上部和外圆壁上部的上密封面；和分别连接所述内圆壁下部和外圆壁下部的下密封面，所述内圆壁与所述内管的外周壁端头密封固定，所述外圆壁与所述外管的内周壁端头密封固定。
  10. 如权利要求9所述的管式厚膜加热器，其特征在于，所述内圆壁与所述内管的外周壁端头通过焊接密封，所述外圆壁与所述外管的内周壁端头通过焊接密封。
  11. 如权利要求10所述的管式厚膜加热器，其特征在于，所述螺旋状导流结构由套设在所述内管上的螺旋金属丝形成；所述螺旋金属丝为不锈钢丝，所述不锈钢丝与所述内管的外周壁焊接在一起；并且/或者，所述螺旋金属丝的轴向截面形状为三角形或者梯形或者矩形，并且/或者，所述内管的两端与所述外管的两端分别相平齐。
  12. 如权利要求10所述的管式厚膜加热器，其特征在于，所述内管与所述外管均为不锈钢管。
  13. 如权利要9所述的管式厚膜加热器，其特征在于，所述加热组件包括：配置于所述外管的外周壁上的绝缘介质层，及配置于所述绝缘介质层上的发热电路，所述发热电路包括固定于所述绝缘介质层上的多个发热电阻与电极，所述发热电阻的两端分别与所述电极电连接。
  14. 如权利要求13所述的管式厚膜加热器，其特征在于，各所述发热电阻的延伸方向与所述外管的长度方向一致；所述进液口连接有水泵；该液体加热装置还包括第一温感传感器，以及与所述第一温感传感器电连接的第一控制器；所述第一温感传感器配置于所述外管的靠近所述出液口的位置处，所述第一控制器用于根据所述第一温感传感器发出的温度信息，控制所述水泵进液的速度和/或所述发热电阻的加热功率。
  15. 如权利要求14所述的管式厚膜加热器，其特征在于，多个所述发热电阻绕所述外管的外周壁分布；该液体加热装置还包括第二温感传感器、以及与所述第二温感传感器电连接的第二控制器；所述第二温感传感器设置在所述外管上并靠近所述发热电阻设置，用于检测其所处位置的外管温度；所述第二控制器用于接收所述第二温感传感器发出的外管温度，并当所述外管温度在第一预设加热时间段内高于第一预设温度阈值时，控制所述发热电路断路并且/或者发出空烧提醒信息。16.具有保护功能的管式厚膜加热器，其特征在于，包括如权利要求1至8任一所述的管式厚膜加热器保护装置，还包括管式加热器组件；
    所述管式加热器组件上部套设在所述上凹槽内，所述管式加热器组件下部套设在所述下凹槽内；
    所述管式加热器组件包括：
    内管，所述内管的外周壁配置有螺旋状导流结构；
    外管，所述外管套设在所述螺旋状导流结构的外部；所述外管的外周壁上设有加热组件；所述外管的内周壁与所述螺旋状导流结构之间相隔预定的径向间隙；
    所述内管与所述外管之间形成流道，所述流道的至少一端开口由密封端盖 封盖；所述流道的腔壁上设置有进液口和出液口；
    所述密封端盖为环形密封端盖，所述环形密封端盖包括同圆心设置的内圆壁和外圆壁，以及分别连接所述内圆壁上部和外圆壁上部的上密封面；和分别连接所述内圆壁下部和外圆壁下部的下密封面，所述内圆壁与所述内管的外周壁端头密封固定，所述外圆壁与所述外管的内周壁端头密封固定。
  16. 如权利要求16所述的具有保护功能的管式厚膜加热器，其特征在于，所述螺旋状导流结构由套设在所述内管上的螺旋金属丝形成。
  17. 如权利要求17所述的具有保护功能的管式厚膜加热器，其特征在于，所述螺旋金属丝为不锈钢丝，所述不锈钢丝与所述内管的外周壁焊接在一起；并且/或者，所述螺旋金属丝的轴向截面形状为三角形或者梯形或者矩形，并且/或者，所述内管的两端与所述外管的两端分别相平齐。
  18. 如权利要求16所述的具有保护功能的管式厚膜加热器，其特征在于，所述加热组件包括：配置于所述外管的外周壁上的绝缘介质层，及配置于所述绝缘介质层上的发热电路，所述发热电路包括固定于所述绝缘介质层上的多个发热电阻与电极，所述发热电阻的两端分别与所述电极电连接。
  19. 如权利要求19所述的具有保护功能的管式厚膜加热器，其特征在于，各所述发热电阻的延伸方向与所述外管的长度方向一致；所述进液口连接有水泵；所述加热器组件还包括第一温感传感器，以及与所述第一温感传感器电连接的第一控制器；所述第一温感传感器配置于所述外管的靠近所述出液口的位置处，所述第一控制器用于根据所述第一温感传感器发出的温度信息，控制所述水泵进液的速度和/或所述发热电阻的加热功率。
  20. 如权利要求19所述的管式厚膜加热器，其特征在于，多个所述发热电 阻绕所述外管的外周壁分布；所述加热器组件还包括第二温感传感器、以及与所述第二温感传感器电连接的第二控制器；所述第二温感传感器设置在所述外管上并靠近所述发热电阻设置，用于检测其所处位置的外管温度；所述第二控制器用于接收所述第二温感传感器发出的外管温度，并当所述外管温度在第一预设加热时间段内高于第一预设温度阈值时/或工作中高于第二预设温度阈值时，控制所述发热电路断路并且/或者发出超温保护提醒信息。
  21. 如权利要求20所述的管式厚膜加热器，其特征在于，发热电阻通过不锈钢钢管正对于螺旋状导流结构上，发热电阻正对外管内壁在液体流道内。
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EP3875868A1 (en) 2021-09-08
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CN109458729A (zh) 2019-03-12
US20210247101A1 (en) 2021-08-12
EP3875868B1 (en) 2023-06-07
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