WO2012109993A1 - Soupape de dilatation électrique - Google Patents

Soupape de dilatation électrique Download PDF

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Publication number
WO2012109993A1
WO2012109993A1 PCT/CN2012/071210 CN2012071210W WO2012109993A1 WO 2012109993 A1 WO2012109993 A1 WO 2012109993A1 CN 2012071210 W CN2012071210 W CN 2012071210W WO 2012109993 A1 WO2012109993 A1 WO 2012109993A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
retaining ring
electronic expansion
valve needle
expansion valve
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/CN2012/071210
Other languages
English (en)
Chinese (zh)
Inventor
沈自成
舒小辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Sanhua Co Ltd
Original Assignee
Zhejiang Sanhua Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from CN201110040455.2A external-priority patent/CN102644785B/zh
Priority claimed from CN201110129451.1A external-priority patent/CN102788457B/zh
Application filed by Zhejiang Sanhua Co Ltd filed Critical Zhejiang Sanhua Co Ltd
Publication of WO2012109993A1 publication Critical patent/WO2012109993A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention relates to the technical field of HVAC, and in particular to an electronic expansion valve.
  • Electronic expansion valves are widely used for throttling expansion and flow regulation of fluids.
  • Fig. 1 is a schematic view showing the structure of a typical variable speed electronic expansion valve for inverter air conditioner.
  • the electronic expansion valve mainly comprises a permanent magnet type stepping motor 1, a gear reducer with three stages of deceleration, a screw rod 5 located in the nut 4, and a thread pair structure 3, a bushing 6 located in the valve seat 8, and a reduction elasticity A core member such as the member 7 and the valve needle member 9.
  • the specific working principle is as follows: The air conditioner system 2 rotates, and the thread sub-structure 3 converts the rotation into the axial movement of the screw rod 5. When the valve closing pulse is applied, the rotor rotates counterclockwise, and is transmitted through the thread pair structure 3, the screw rod 5 moves downward, against the force-transmitting member bushing 6, and the bushing 6 abuts against the upper end of the valve needle member 9 to move downward.
  • the return elastic member ⁇ is in a continuously stretched state, the end of the valve needle member 9
  • the portion gradually seals the valve port 10, that is, the opening degree of the valve port 10 gradually decreases with the downward movement of the needle member 9; when the valve opening pulse is applied, the rotor rotates clockwise, the screw rod 5 moves upward, and the valve needle member 9 Without the downward contact force of the bushing 6, the valve needle member 9 will continuously move upward under the return elastic force of the return elastic member 7 and the system pressure, and the opening degree of the valve port 10 is gradually increased. Therefore, the degree of opening of the valve port 10 of the electronic expansion valve is changed, so that the flow area is changed, thereby controlling the flow rate and adjusting the degree of heat.
  • An object of the present invention is to provide an electronic expansion valve in which the upward movement height of the valve member can be limited to extend the service life of the return elastic member.
  • the present invention provides an electronic expansion valve including a driving mechanism, a transmission mechanism, a valve seat and a valve needle member; the valve needle member has an axial movement along the valve chamber of the electronic expansion valve to control the valve opening degree a valve needle and a valve stem of a size, and a return elastic member retracted or stretched as the valve needle moves up and down, wherein the electronic expansion valve further includes a valve disposed in the valve chamber and having an axial passage Limiting structure, the valve needle member has a lateral flange; the limiting structure is located on the valve needle member and moved to the upper side of the flange when the valve port is just at the maximum opening degree, and the shaft The radial minimum dimension to the channel is less than the radial maximum dimension of the flange.
  • the maximum outer diameter of the valve needle is greater than the diameter of the valve stem, and the flange is the valve needle.
  • the limiting structure is a retaining ring having a central hole, an outer circumference of the retaining ring is positioned with an inner wall of the valve cavity, and the central hole is the axial passage.
  • the outer circumference of the cross section of the valve needle is substantially square
  • the central hole is substantially square
  • the side length of the central hole is larger than the side length of the outer circumference of the valve needle and smaller than the maximum diagonal of the outer circumference of the valve needle Line length.
  • the outer circumference of the cross section of the valve needle is substantially rectangular
  • the central hole is substantially rectangular
  • the length of the central hole is greater than the length of the outer circumference of the valve needle
  • the width of the central hole is larger than the outer circumference of the valve needle
  • the width of the central aperture is less than the maximum diagonal length of the outer circumference of the valve needle.
  • the inner wall of the valve seat has an annular groove adapted to the outer circumference of the retaining ring, and
  • the retaining ring has an opening that extends in a radial direction.
  • the outer circumference of the retaining ring is substantially circular.
  • the axial distance between the limiting structure and the flange is less than lmm.
  • the axial distance between the limiting structure and the flange is between 0.2 mm and 1 mm.
  • the elastic member is a bellows.
  • the electronic expansion valve has a limiting structure in the valve cavity, and when the valve needle member is moved to the position at the maximum position of the valve port or slightly higher than the position, the valve can not continue to move up due to the resistance of the limiting structure, then the valve The upper end of the needle member cannot move up even if it does not interfere with other components. Therefore, when the coil is replaced or if the needle member needs to be separated from the other components above, the needle member does not move up significantly under system pressure.
  • the limit structure is located above the flange when the valve port is at the maximum opening degree, therefore, the limit structure moves on the restriction valve needle member When it does not affect the control of the valve stem opening to the size of the valve opening.
  • the present invention also provides an electronic expansion valve including a valve seat, a valve stem that moves axially along the valve cavity, and a return elastic member that retracts and contracts as the valve stem moves, the reset elastic member
  • the upper end is positioned on the valve body by a positioning component
  • the valve cavity is provided with a limiting component
  • the inner wall of the valve cavity has a radial boss
  • the limiting component is placed on the boss
  • the limit is
  • the component has an axial passage for the valve stem to penetrate
  • the valve stem has a radial flange below the axial passage, the radial minimum dimension of the axial passage being smaller than the radial direction of the flange
  • the valve cavity is further provided with a support member, and the support member is supported between the limiting member and the positioning member.
  • the limiting member is a retaining ring having a central bore
  • the support member is a sleeve that covers the resilient member
  • the sleeve is cylindrical, and after the sleeve is placed in the valve cavity, the side wall of the sleeve abuts against the inner wall of the valve chamber.
  • the retaining ring has an opening communicating with the inner peripheral wall and the outer peripheral wall thereof, and the axial height of the opening is the axial height of the retaining ring.
  • the valve needle at the end of the valve stem is the flange.
  • the central hole has a circular shape, and the central hole has a diameter smaller than a maximum outer diameter of the valve needle.
  • the axial distance between the retaining ring and the flange is less than 2 mm.
  • the axial distance between the retaining ring and the flange is between 0.2 mm and 1 mm.
  • the elastic member is a bellows.
  • the electronic expansion valve has a limiting component in the valve cavity, the limiting component has an axial passage for the valve stem to penetrate, the valve stem has a flange below the axial passage, and the radial minimum dimension of the flange is larger than the shaft
  • the radial maximum dimension of the channel, and at the same time, the limiting member forms an axial positioning between the valve body and the valve body.
  • the valve stem will not move up significantly under system pressure, thereby avoiding excessive compression of the bellows type return elastic member and prolonging the reset elastic member.
  • Service life In addition, the limiting member is positioned by the support member located between the radial boss and the positioning member, and the limiting member and the supporting member are placed on the radial boss during assembly, and the operation process is simple.
  • FIG. 1 is a schematic structural view of a typical variable speed electronic expansion valve for an inverter air conditioner
  • FIG. 2 is a schematic structural view of a first embodiment of an electronic expansion valve according to the present invention
  • FIG. 3 is an electronic expansion valve provided by the present invention. Schematic diagram of the valve needle member
  • Figure 4 is a schematic cross-sectional view of the upper end of the valve needle of Figure 3;
  • Figure 5 is a schematic structural view of the retaining ring of Figure 2;
  • Figure 6 is a schematic view showing another structure of the retaining ring of Figure 2;
  • Figure 7 is a schematic view showing another structure of the retaining ring of Figure 2;
  • Figure 8 is a schematic structural view of a second embodiment of the electronic expansion valve provided by the present invention
  • Figure 9 is a schematic structural view of the valve needle member of Figure 8
  • Figure 10 is a structural schematic view of the valve needle member of Figure 8 after assembly with the retaining ring and the sleeve
  • Figure 11 is a schematic structural view of the retaining ring of Figure 8;
  • Figure 12 is a schematic view showing another structure of the retaining ring of Figure 8.
  • Figure 13 is a schematic view showing the structure of the closed retaining ring of Figure 8.
  • Fig. 14 is a schematic view showing another structure of the closed retaining ring of Fig. 8.
  • the core of the present invention is to provide an electronic expansion valve whose lift height of the valve needle member can be limited to extend the service life of the return elastic member.
  • FIGS. 8-14 are schematic structural views of a second embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a first embodiment of an electronic expansion valve according to the present invention
  • FIG. 3 is a schematic structural view of a valve needle member of the electronic expansion valve provided by the present invention
  • 4 is a schematic cross-sectional view of the upper end of the valve needle of FIG. 3
  • FIG. 5 is a schematic structural view of the retaining ring of FIG.
  • the electronic expansion valve provided by the present invention includes a drive mechanism (which may be the drive motor 21 shown in FIG. 2), a lead screw 25, a nut 24, a valve seat 27, a valve needle member 26, etc., a nut 24 and a valve seat 27
  • the valve chamber 30 forming the electronic expansion valve, the driving motor 21 can be a permanent magnet type stepping motor, and the rotor speed in the driving motor 21 can also be decelerated by the speed reducer 22, and the thread substructure 23 in the transmission mechanism can convert the rotation of the rotor.
  • the screw rod 25 connected to the thread sub-structure 23 can be moved up and down along the axial direction of the valve chamber 30 while rotating, and the screw rod 25 and the thread sub-structure 23 are located in the nut 24,
  • a valve needle member 26 is disposed coaxially below the rod 25, and the valve needle member 26 includes a force transmitting member bushing 261.
  • valve needle member 26 When the screw rod 25 moves downward, the needle member 26 can be moved downward, as the needle member 26 is moved toward The gradual increase of the lower displacement, the opening of the valve port 29 is gradually reduced until the valve port 29 is completely sealed, the valve needle member 26 further includes a return elastic member, and the upper end of the reset spring member can be connected to the valve body by welding, resetting Lower end of the elastic part
  • welding to the valve stem 263 to reset the elastic member 262 may be a bellows or other
  • the cylindrical return spring which has a sealing effect is preferably used because the bellows tube wall is thin, the sensitivity is high, and the product process is mature. As shown in FIG.
  • valve stem 263 drives the bellows 262 to stretch; when the screw rod 25 moves upward, under the action of the bellows 262
  • the valve needle member 26 is moved upward as a whole, and the opening degree of the valve port 29 is gradually increased.
  • the present invention also includes a stop structure disposed in the valve chamber 30, and the valve needle member 26 has a lateral flange that is transverse to the axial direction of the valve chamber 30, the flange being a generally rod-shaped valve relative to the entirety
  • the needle member 26 has an outwardly projecting portion thereon, and the flange is located below the return elastic member due to the restriction of the return elastic member.
  • the limit structure is located on the valve needle member 26 and moved above the flange when the valve port 29 is at the maximum opening degree. Since the opening degree of the valve port 29 is controlled by the valve needle member 26 moving up and down, the upper flange of the valve needle member 26 is relatively The axial position of the limiting structure is variable.
  • the limiting structure of the present invention is disposed above the flange when the valve port 29 is at the maximum opening degree. Under normal working conditions, the valve needle member 26 is moved up by the distance. The drive mechanism controls the distance that the valve needle member continues to move up when the valve port 29 is just at the maximum opening.
  • the limiting structure has an axial passage for the portion above the flange portion of the needle member 26 to penetrate and move up and down, and the radial minimum dimension of the axial passage is smaller than the radial maximum dimension of the flange, the valve needle member 26 When the upward movement is continued, the limit structure will at least interfere with the upper end surface of the flange, and the valve needle member 26 cannot continue to move up.
  • the upper portion described herein is not limited to the fact that the valve needle member 26 is moved upward from the axially lowest position to the upper end surface of the flange when the valve port 29 is just at the maximum opening degree.
  • the limit structure may also be located slightly above this position. At the distance, it is also possible to allow the needle member 26 to continue to move up a distance which is such as to ensure that the amount of compression of the resilient member is minimized, and those skilled in the art will be able to grasp the specific model and size of the electronic expansion valve.
  • the axial distance between the limiting structure position and the flange is less than 1 mm, and further optimization scheme should position the limiting structure with the flange The axial distance between them is limited to between 0.2 mm and 1 mm.
  • both the upper and lower sides described herein are based on the vertically placed electronic expansion valve shown in Fig. 2, and the radial direction is the radial direction of the cross section of the valve chamber 30.
  • the valve chamber 30 of the electronic expansion valve is provided with a limiting structure.
  • the position of the valve member 26 cannot be moved upward due to the resistance of the limiting structure. Therefore, the upper end portion of the needle member 26 cannot move up even if it does not interfere with other members, and therefore,
  • the needle member 26 does not move up significantly under system pressure, thereby avoiding excessive compression of the bellows 262 type return elastic member and prolonging the return elasticity.
  • the service life of the component; and the limit structure is located above the flange when the valve port 29 is at the maximum opening degree. Therefore, the limit structure does not affect the valve needle member 26 opening to the valve port 29 when the valve needle member 26 is moved up. Degree of control.
  • the maximum outer diameter of the valve needle 264 at the lower end of the needle member 26 may be larger than the diameter of the valve stem 263.
  • the upper end surface of the valve needle 264 forms a stepped surface with the valve stem 263.
  • the valve needle 264 of the structure can be used as a flange structure; the limiting structure can be specifically an annular retaining ring 28, as shown in FIG. 5, that is, the retaining ring 28 has a central hole 281, and the outer circumference of the retaining ring 28 and the valve cavity
  • the inner wall of the valve chamber 30 is positioned as the inner wall of the valve seat 27 in Fig. 3.
  • the retaining ring 28 needs to be located above the valve needle 264 just before the valve opening 29 is at the maximum opening degree, as shown in Fig. 2, the valve seat
  • the inner wall of 27 has an inner flange.
  • the amount of compression of the elastic member, taking the specific retaining ring 28 as The limit structure is convenient for fixing with the inner wall of the valve cavity 30, and the positioning is relatively reliable.
  • the limiting structure is not limited to the structure of the retaining ring 28, and may also be two blocking pieces symmetrically disposed in the valve cavity, and an axial passage is formed between the two blocking pieces.
  • a blocking piece can also implement the present invention.
  • one end of the flap is fixed to the inner wall of the valve chamber, and the other end is located above the valve needle 264.
  • Those skilled in the art can select a suitable shape of the limiting structure according to the processing technology, the ease of installation and the like.
  • the central hole 281 of the retaining ring 28 is an axial passage. Since the radial minimum dimension of the central bore 281 is smaller than the radial maximum dimension of the flange, under certain conditions, the valve needle 264 can be inserted into the central hole 281 of the retaining ring 28, and inserted. Thereafter, after rotating at a certain angle, the valve needle 264 and the retaining ring 28 are snapped up.
  • the outer circumference of the valve needle 264 is substantially in the shape of a cross
  • the center hole 281 also has a cross shape corresponding to the outer circumference of the valve needle 264.
  • the valve needle 264 can be inserted into the center hole 281, and the valve needle 264 can not move upward by a certain angle. .
  • the method of restricting the upward movement of the rotary card is simple and easy to implement, and is easy to implement in the process. The manner of the following embodiments can be taken.
  • the outer circumference of the cross section of the upper end of the valve needle 264 can be machined into a substantially square shape. As shown in Figures 3 and 4, since the valve needle 264 needs to move axially along the valve chamber 30, the valve needle 264 is at the four corners of the square.
  • the circular hole has a function of guiding, and the center hole 281 is also substantially square. As shown in FIG. 5, the square side length L of the center hole 281 is larger than the square side length HI of the outer circumference of the valve needle 264 and smaller than the outer circumference of the valve needle 264.
  • the maximum diagonal length H2 the maximum diagonal length is the radial maximum size. Then, during the assembly process, the annular retaining ring 28 and the peripheral wall of the valve seat 27 can be first positioned.
  • the valve needle can be selected at an appropriate angle. 264 is inserted into the center hole 281 of the retaining ring 28, and after the valve needle 264 is positioned below the center hole 281, the valve needle member 26 is rotated, since the maximum diagonal length H2 of the outer circumference of the valve needle 264 is larger than the square side length L of the center hole 281 With the rotation of the valve needle member 26, the upper end face of the partial valve needle 264 is necessarily blocked by the retaining ring 28, such as the rotation 45. The direction of the maximum diagonal of the outer circumference of the valve needle 264 is perpendicular to the longitudinal direction of the center hole 281.
  • the upper end surface of the valve needle 264 can be the largest against the retaining ring 28, and the limit is relatively reliable.
  • the mouth portion of the upper end surface of the valve seat 27 and the valve body can be riveted and welded, and the valve needle member 26 and the valve needle 264 are transverse (direction perpendicular to the axial direction).
  • the angular variation range is small.
  • FIG. 6 is another structural diagram of the retaining ring of FIG. 2;
  • FIG. 7 is another structural schematic view of the retaining ring of FIG.
  • the outer peripheral shape of the cross section of the upper end of the valve needle 264 is substantially rectangular, and the central hole 281 of the retaining ring 28 may also be substantially rectangular.
  • the rectangular length D of the central hole 281 is larger than the rectangular length of the outer circumference of the valve needle 264, and the central hole
  • the rectangular width d of the 281 is larger than the rectangular width of the outer circumference of the valve needle 264, and the maximum diagonal length of the outer circumference of the valve needle 264 is larger than the rectangular width d of the central hole 281.
  • the valve needle 264 can be inserted into the center hole 281 and rotated by a certain angle. For example, 90°, the longitudinal direction of the valve needle 264 is perpendicular to the longitudinal direction of the center hole 281, and when the valve needle 264 is moved up, the upper end surface of the valve needle 264 is in contact with the retaining ring 28 .
  • the outer peripheral shape of the retaining ring 28 shown in FIG. 4 and FIG. 5 is circular, in fact, outside the retaining ring 28
  • the shape of the circumference is not limited, and it is convenient to position the inner wall of the valve chamber 30.
  • the outer peripheral shape of the retaining ring 28 may also be substantially rectangular, and the apex angle of the retaining ring 28 may have rounded corners. Such a structure can also be applied to the present invention to attain the object of the present invention.
  • annular groove adapted to the outer circumference of the retaining ring 28 can be machined on the inner wall of the valve chamber 30, and when the outer peripheral ring is a circular retaining ring 28, the block is blocked.
  • the fit of the ring 28 to the annular groove is relatively high, and the processing of the circular retaining ring 28 is relatively simple.
  • the retaining ring 28 can have a radially extending opening 282. As shown in Figures 4, 5 and 6, the annular retaining ring 28 has a radial indentation when the outer circumference of the retaining ring 28 is squeezed due to the retaining ring. 28 has a radial notch, and the two end faces of the opening 282 of the retaining ring 28 have a tendency to close, and the retaining ring 28 can be contracted to a certain extent. For example, when the retaining ring 28 of metal material is used, the retaining ring 28 has a larger Shrinkage, since the outer diameter of the retaining ring 28 needs to be larger than the inner diameter of the valve chamber 30, the retaining ring 28 can be inserted into the recess for positioning.
  • the retaining ring 28 when the retaining ring 28 is inserted into the valve chamber 30, the retaining ring 28 will Pressed by the inner peripheral wall of the valve chamber 30, the retaining ring 28 having the opening 282 can be conveniently pressed into the valve chamber 30.
  • the retaining ring 28 When the annular groove is formed, the retaining ring 28 can be naturally expanded and embedded in the annular groove. . Therefore, the structure of the annular retaining ring 28 is relatively simple and easy to assemble.
  • FIG. 8 is a schematic structural view of a second embodiment of an electronic expansion valve according to the present invention
  • FIG. 9 is a schematic structural view of the valve needle component of FIG. 8
  • the electronic expansion valve in this embodiment includes a drive mechanism (which may be the drive motor 21 shown in Fig. 8), a lead screw 25, a nut 24, a valve seat 27, a valve needle member 26, and the like.
  • the valve body has a valve chamber 30, and the driving motor 21 can be driven by a permanent magnet type stepping motor.
  • the rotor speed of the driving motor 21 can also be decelerated by the speed reducer 22.
  • the thread substructure 23 of the transmission mechanism can convert the rotation of the rotor into a thread.
  • the axial movement of the secondary structure 23 allows the screw 25 that cooperates with the threaded substructure 23 to move up and down along the axial direction of the valve chamber 30 while rotating.
  • the lead screw 25 and the threaded substructure 23 are located within the nut 24, and the lead screw 25
  • the valve needle member 26 is coaxially disposed below, and the valve needle member 26 includes a force transmitting member bushing 261, a valve stem 263, and a valve needle 264 at the end of the valve stem 263.
  • the valve needle 264 moves downward, and as the valve needle 264 is displaced downwardly, the opening of the valve port 29 is gradually reduced until the valve port 29 is completely sealed, and the valve needle member 26 further includes a return elastic member, which is reset.
  • the upper end of the elastic member is fixed to the valve body by the positioning member
  • the fixing member may be a fixing cover 265 located at the top of the valve needle member in FIG.
  • the return elastic member may be fixed to the fixing cover 265 by welding to achieve fixing with the valve body, and the return elastic member may be corrugated.
  • the tube 262 or other cylindrical return spring which has a sealing effect is preferably used because the bellows tube wall is thin, the sensitivity is high, and the product process is mature.
  • the valve stem 263 drives the bellows 262 to stretch; when the screw rod 25 moves upward, the bellows 262 is reset. Under the action and the pressure of the system, the valve stem 263, the valve needle 264 and the bushing 261 move upward as a whole, and the opening degree of the valve port 29 gradually increases.
  • the present invention also includes a stop member disposed in the valve chamber 30, and the inner wall of the valve chamber 30 has a radial boss 271.
  • the radial boss 271 necessarily does not limit the axial movement of the valve needle member, as shown in the figure.
  • the upper end of the valve chamber 30 has a large diameter, and is mainly used for placing a portion of the valve needle member including the bellows 262.
  • the diameter of the lower end of the valve chamber 30 is smaller than the diameter of the upper end, and mainly serves as a guide for the valve needle 264.
  • An upward stepped surface is formed on the valve seat 27 to form a large diameter valve chamber section and a small diameter valve chamber section, and a radial boss 271 can be formed on the inner wall of the valve seat 27.
  • the limiting member is placed on the radial boss 271, and a support member is further disposed in the valve chamber 30.
  • the support member is located between the positioning member and the limiting member, and the positioning member is the fixing cover 265 shown in FIG.
  • the flange is restricted by the positional component and cannot be moved up. Therefore, the bushing 261 cannot move up even if it does not interfere with other components.
  • the setting of the limit member must meet the normal use of the electronic expansion valve, and does not affect the valve opening range, that is, the limit member is located, when the valve stem 263 is moved to the maximum opening of the valve port, above the flange . Therefore, when coil replacement or other need to separate the valve needle member from other components above, the valve stem does not move up significantly under system pressure, thereby avoiding excessive compression of the bellows type return elastic member and prolonging the reset elastic member.
  • Service life; further, the limiting member is positioned by the support member located between the radial boss 271 and the positioning member, and the limiting member and the supporting member are placed on the radial boss 271 during assembly, and the operation process is performed. simple.
  • the support member is a sleeve 281, and the limiting member is a block having a central hole 2821.
  • the retaining ring 282 is placed on the radial boss 271, and the lower end of the sleeve 281 is placed on the retaining ring 282; the maximum outer diameter of the valve needle 264 is larger than the diameter of the valve stem 263, as shown in FIG.
  • the radial flange structure of the valve needle member is formed by the upper end surface of the valve needle 264.
  • the specific assembly process of the above structure is as follows: First, the sleeve 281 is fitted with the valve needle member, that is, the valve needle member is inserted into the sleeve 281 from the end of the valve needle 264, and the maximum outer diameter of the fixed cover 265 of the valve needle member is larger than that of the sleeve 281.
  • the upper end diameter, the sleeve 281 can not be withdrawn from the top of the valve needle member; secondly, the retaining ring 282 is fitted over the valve stem 263 between the sleeve 281 and the radial flange; finally, the limit member and the support will be assembled
  • the valve needle member of the valve member is inserted into the valve chamber 30, and the fixed cover 265 of the valve needle member and the upper end of the valve seat 27 can be fixed by riveting.
  • the fixing cover 265 and the valve body can also be realized by other conventional methods.
  • the retaining ring 282, which is inserted into the valve chamber 30, is located on the radial boss 271.
  • the lower end of the sleeve 281 is located above the surface of the retaining ring 282, and the upper end of the sleeve 281 is located below the fixed cover 265.
  • the maximum outer diameter of the valve needle member 264 at the lower end of the valve needle member is larger than the diameter of the valve stem 263, and cooperates with the retaining ring 282 to achieve the purpose of restricting the upward movement of the valve needle member, i.e., by the valve needle 264 as the radial direction of the valve stem 263.
  • the flange, the structure of the valve needle member of the structure is relatively simple. In fact, the object of the present invention can be achieved as long as the valve stem 263 has a radial flange that cooperates with the retaining ring 282. Of course, the maximum outer diameter of the radial flange is at least greater than the minimum inner diameter of the retaining ring 282. The role of the bit.
  • FIG. 11 is a schematic structural view of the retaining ring of FIG.
  • the retaining ring 282 may have an opening communicating with the inner peripheral wall and the outer peripheral wall thereof, and the axial height of the opening is the axial height of the retaining ring.
  • the annular retaining ring 282 has a notch.
  • FIG. 12 is another structural schematic diagram of the retaining ring of FIG. 8, and a square shape can also be processed.
  • the center hole 2821 whose side length D3 is smaller than the maximum outer diameter D2 of the valve needle 264 can also achieve the object of the present invention.
  • FIG. 13 is a schematic structural view of the closed retaining ring of FIG. 8;
  • FIG. 14 is another structural schematic view of the closed retaining ring of FIG.
  • the opening degree of the valve port 29 is controlled by the valve needle member moving up and down, the axial position of the upper end surface of the valve needle 264 at the end of the valve stem 263 with respect to the retaining ring 282 is variable, and the retaining ring 282 of the above embodiment is provided at the valve.
  • the port 29 is above the upper end surface of the valve needle 264 at the maximum opening degree.
  • the upward movement distance of the valve stem 263 is controlled by the driving mechanism, and when the valve opening 29 is moved to the maximum opening degree, the valve stem 263 continues. The distance moved is limited.
  • the central hole 2821 of the retaining ring 282 is an axial passage through which the valve stem 263 is inserted and moved up and down.
  • the upper portion described herein is not limited thereto, and when the valve stem 263 is moved upward from the axial lowest position to the valve opening 29 at the maximum opening degree, the upper end surface of the valve needle 264 may actually be located slightly above this. At a certain distance from the position, it is also possible to allow the valve stem 263 to continue to move up a certain distance, which should ensure that the selection of the resilient member is minimized, and when the valve stem 263 is moved up to the maximum opening of the valve port 29,
  • the axial distance between the ring 282 and the upper end surface of the valve needle 264 is less than 2 mm. Further, the axial distance between the retaining ring 282 and the upper end surface of the valve needle 264 can be limited to between 0.2 mm and 1 mm.
  • the upper and lower sides described herein are based on the vertically placed electronic expansion valve shown in FIG. 8 , the axial direction of the valve chamber 30, and the radial direction of the valve chamber 30.
  • the cross-sectional radial direction is the described viewing angle, perpendicular to the axial direction.
  • the limiting member is a retaining ring 282, and the supporting member is a sleeve 281.
  • the structure of the two is relatively simple, which is convenient for actual processing.
  • the sleeve 281 and the retaining ring 282 are sequentially coated with the valve needle member. When dismantled, it can be taken out with the valve needle component as a whole, which is convenient to disassemble and assemble;
  • the extraction sleeve 281 and the retaining ring 282 are combined, when the impact force of the valve stem 263 is moved upward, the force is even, and the limit is relatively reliable.
  • the limiting member can be positioned in the axial direction with the valve body.
  • the sleeve 281 can be cylindrical, and the outer diameter of the sleeve 281 is approximately equal to the diameter.
  • the inner diameter of the valve chamber 30 above the boss 271 i.e., the inner diameter of the large-diameter valve chamber is as shown in Fig. 8.
  • the sleeve 281 can abut against the inner wall of the valve chamber 30, and actually the sleeve 281 Positioned in both the axial and radial directions, the sleeve 281 is positioned securely while also achieving a more reliable positioning of the retaining ring 282, thereby further improving the reliability of the limit member limiting the excessive upward movement of the valve stem 263.
  • the sleeve 281 in the above embodiment is not limited to a complete cylindrical structure, and the length thereof is substantially equal to the distance between the retaining ring 281 and the fixed cover 265.
  • the limit function of the retaining ring 282 is not affected.
  • the lower end portion of the sleeve 281 can also directly fix other limiting members.
  • the lower end portion of the sleeve 281 directly fixes the radially extending blocking piece, and the object of the present invention can also be achieved, specifically to the above implementation.
  • the retaining ring 282 can also be fixedly coupled to the lower end of the sleeve 281 to form the bottom of the sleeve 281.
  • the ease with which such a structure is assembled with the valve needle member is inferior to the above embodiment.
  • a component for restricting the upward movement distance of the valve needle member is disposed inside the valve cavity of the electronic expansion valve, and the two embodiments are respectively fixed with respect to the valve body.
  • the limiting structure and the limiting member have an axial passage, and the valve stem is provided with a lateral flange (the second embodiment is expressed as a radial boss).
  • the limiting principle of the two is the same, but the second embodiment is based on the first embodiment, and further supports a support member (such as the sleeve 281 described herein) to realize the positioning of the limiting member. Therefore, the two specific embodiments achieve the purpose of limiting the excessive movement of the valve needle member by the cooperation of the limiting member and the valve needle member.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lift Valve (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

La présente invention se rapporte à une soupape de dilatation électrique comprenant un mécanisme d'entraînement, un mécanisme de transmission, un siège de soupape et un composant à goupille de soupape ; le composant à goupille de soupape comporte une goupille de soupape et une tige de soupape mobiles le long de la direction axiale d'une chambre de soupape de la soupape de dilatation électrique de manière à commander la taille d'ouverture de l'ouverture de soupape, et comporte un composant flexible de retour ; la soupape de dilatation électrique comprend également une structure d'arrêt agencée dans la chambre de soupape et possédant un canal axial, et le composant à goupille de soupape comporte une bride latérale ; la structure d'arrêt se situe au-dessus de la bride lorsque le composant à goupille de soupape est déplacé vers le haut jusqu'à une position où l'ouverture de soupape se trouve à la taille d'ouverture maximale, et la dimension radiale minimale du canal axial est inférieure à la dimension radiale maximale de la bride. Lorsque la goupille de soupape de la soupape de dilatation électrique est déplacée vers le haut jusqu'à la position dans laquelle l'ouverture de soupape est à sa taille maximale, ou au-dessus de cette position, elle ne peut plus être montée davantage en raison de la limite de la structure d'arrêt, ainsi lorsque le composant à goupille de soupape a besoin d'être séparé des autres composants supérieurs pour effectuer le démontage et le remplacement d'une bobine ou d'autres opérations, le composant de goupille de soupape ne montera pas de beaucoup pour trop comprimer le composant flexible de retour, si bien que la durée de vie du composant flexible est prolongée.
PCT/CN2012/071210 2011-02-17 2012-02-16 Soupape de dilatation électrique Ceased WO2012109993A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201110040455.2 2011-02-17
CN201110040455.2A CN102644785B (zh) 2011-02-17 2011-02-17 一种电子膨胀阀
CN201110129451.1A CN102788457B (zh) 2011-05-18 2011-05-18 一种电子膨胀阀
CN201110129451.1 2011-05-18

Publications (1)

Publication Number Publication Date
WO2012109993A1 true WO2012109993A1 (fr) 2012-08-23

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WO (1) WO2012109993A1 (fr)

Cited By (6)

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Publication number Priority date Publication date Assignee Title
JP2016023709A (ja) * 2014-07-18 2016-02-08 株式会社鷺宮製作所 電動弁
CN106439167A (zh) * 2016-10-12 2017-02-22 诸暨市亿霸电子阀门有限公司 一种新型电子膨胀阀线圈定位结构
JP2017223372A (ja) * 2017-09-19 2017-12-21 株式会社鷺宮製作所 電動弁
CN113039399A (zh) * 2018-12-20 2021-06-25 丹佛斯有限公司 电动膨胀阀
CN113280121A (zh) * 2020-02-20 2021-08-20 浙江三花智能控制股份有限公司 电动阀
US12117215B2 (en) 2018-12-20 2024-10-15 Danfoss A/S Valve having a motor arranged inside a tube having sections with different diameters

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US4556193A (en) * 1983-09-30 1985-12-03 Fuji Koki Manufacturing Co., Ltd. Motor-driven expansion valve
JPH1182796A (ja) * 1997-09-16 1999-03-26 Fuji Koki Corp 電動弁
CN1519495A (zh) * 2003-02-03 2004-08-11 ��ʽ���粻������ 电动阀
CN2787942Y (zh) * 2005-02-06 2006-06-14 上海俊乐制冷自控元件有限公司 一种减速式电子膨胀阀
CN201251329Y (zh) * 2008-08-07 2009-06-03 浙江三花股份有限公司 一种阀结构及电子膨胀阀

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556193A (en) * 1983-09-30 1985-12-03 Fuji Koki Manufacturing Co., Ltd. Motor-driven expansion valve
JPH1182796A (ja) * 1997-09-16 1999-03-26 Fuji Koki Corp 電動弁
CN1519495A (zh) * 2003-02-03 2004-08-11 ��ʽ���粻������ 电动阀
CN2787942Y (zh) * 2005-02-06 2006-06-14 上海俊乐制冷自控元件有限公司 一种减速式电子膨胀阀
CN201251329Y (zh) * 2008-08-07 2009-06-03 浙江三花股份有限公司 一种阀结构及电子膨胀阀

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016023709A (ja) * 2014-07-18 2016-02-08 株式会社鷺宮製作所 電動弁
CN106439167A (zh) * 2016-10-12 2017-02-22 诸暨市亿霸电子阀门有限公司 一种新型电子膨胀阀线圈定位结构
CN106439167B (zh) * 2016-10-12 2024-01-23 诸暨市亿霸电子阀门有限公司 一种新型电子膨胀阀线圈定位结构
JP2017223372A (ja) * 2017-09-19 2017-12-21 株式会社鷺宮製作所 電動弁
CN113039399A (zh) * 2018-12-20 2021-06-25 丹佛斯有限公司 电动膨胀阀
CN113039399B (zh) * 2018-12-20 2022-08-12 丹佛斯有限公司 电动膨胀阀
US12072039B2 (en) 2018-12-20 2024-08-27 Danfoss A/S Electric expansion valve
US12117215B2 (en) 2018-12-20 2024-10-15 Danfoss A/S Valve having a motor arranged inside a tube having sections with different diameters
CN113280121A (zh) * 2020-02-20 2021-08-20 浙江三花智能控制股份有限公司 电动阀

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