WO2020140988A1 - 加热装置 - Google Patents

加热装置 Download PDF

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Publication number
WO2020140988A1
WO2020140988A1 PCT/CN2020/070342 CN2020070342W WO2020140988A1 WO 2020140988 A1 WO2020140988 A1 WO 2020140988A1 CN 2020070342 W CN2020070342 W CN 2020070342W WO 2020140988 A1 WO2020140988 A1 WO 2020140988A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiating antenna
heating device
antenna
electromagnetic
generation module
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/CN2020/070342
Other languages
English (en)
French (fr)
Inventor
王海娟
李鹏
赵坤坤
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.)
Haier Smart Home Co Ltd
Original Assignee
Haier Smart Home 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
Application filed by Haier Smart Home Co Ltd filed Critical Haier Smart Home Co Ltd
Priority to EP20736015.7A priority Critical patent/EP3905848B1/en
Priority to AU2020204763A priority patent/AU2020204763B2/en
Priority to US17/420,564 priority patent/US12213236B2/en
Publication of WO2020140988A1 publication Critical patent/WO2020140988A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
    • A23B2/00—Preservation of foods or foodstuffs, in general
    • A23B2/001—Details of apparatus, e.g. pressure feed valves or for transport, or loading or unloading manipulation
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
    • A23B2/00—Preservation of foods or foodstuffs, in general
    • A23B2/80—Freezing; Subsequent thawing; Cooling
    • A23B2/82—Thawing subsequent to freezing
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/62—Apparatus for specific applications
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/72—Radiators or antennas
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/12—Arrangements of compartments additional to cooling compartments; Combinations of refrigerators with other equipment, e.g. stove
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control
    • H05B6/688—Circuits for monitoring or control for thawing

Definitions

  • the invention relates to kitchen utensils, in particular to an electromagnetic wave heating device.
  • the prior art In order to facilitate users to freeze and defrost foods, the prior art generally defrosts foods through electromagnetic wave devices.
  • the temperature uniformity of the food after thawing is closely related to the uniformity of the distribution of electromagnetic waves in the heating chamber.
  • the electromagnetic waves in the heating chamber will be concentrated in the radiation antenna due to the edge effect of the radiation antenna At the periphery.
  • an electromagnetic wave heating device with uniform electromagnetic wave distribution is required in the design.
  • An object of the present invention is to provide a heating device with uniform electromagnetic wave distribution.
  • a further object of the invention is to improve the assembly efficiency of the heating device.
  • Another further object of the present invention is to improve heating efficiency.
  • the present invention provides a heating device, including:
  • the cylinder body defines therein a heating chamber with a pick-and-place port, the heating chamber is used to place the object to be processed;
  • the door body is provided at the access port for opening and closing the access port;
  • An electromagnetic generation module configured to generate electromagnetic wave signals
  • a radiating antenna is installed in the barrel and electrically connected to the electromagnetic generating module to generate electromagnetic waves of corresponding frequencies according to the electromagnetic wave signals;
  • the periphery of the radiating antenna is formed by a smooth curve to make the electromagnetic wave distribution in the heating chamber more uniform.
  • the geometric center of the radiation antenna coincides with the center of the cross section of the heating chamber taken along the installation plane of the radiation antenna.
  • the radiating antenna has a perfect circular shape.
  • the radius of the radiating antenna is 5/13 to 13/20 of the shortest distance from the circumference of the cross-section to the center thereof.
  • the cross-section is rectangular or rectangular
  • the radiating antenna is rectangular, and the length direction of the radiating antenna is parallel to the length direction of the cross-section.
  • the length of the radiating antenna is 9/20 to 7/10 of the length of the cross-section.
  • the width of the radiating antenna is 3/10 ⁇ 13/20 of the width of the cross section
  • the rounded corner of the radiating antenna is 2/7 to 1/2 of the width of the radiating antenna.
  • the barrel is made of metal
  • the radiation antenna is horizontally arranged at a height of 1/3 to 1/2 of the cylinder.
  • the heating device further includes:
  • the radome is made of insulating material and is arranged to divide the internal space of the cylinder into the heating chamber and the electrical appliance room, wherein the radiating antenna is installed in the electrical appliance room and fixedly connected to the radome.
  • the radiation antenna is formed with a plurality of clamping holes
  • the radome is correspondingly formed with a plurality of buckles, and the plurality of buckles are configured to respectively buckle with the radiating antenna through the plurality of buckling holes;
  • the buckle is composed of two barbs spaced apart and mirror-symmetrical; or
  • the buckle is composed of a fixing portion perpendicular to the radiating antenna and hollow in the middle, and an elastic portion extending from the inner end edge of the fixing portion to the radiating antenna obliquely to the fixing portion.
  • the heating device further includes:
  • the signal processing and measurement and control circuit which is installed in the electrical appliance room, includes:
  • a detection unit connected in series between the electromagnetic generation module and the radiation antenna, and the detection unit is configured to detect specific parameters of the incident wave signal and the reflected wave signal passing therethrough;
  • a control unit configured to calculate the electromagnetic wave absorption rate of the object to be processed according to the specific parameter
  • a matching unit is connected in series between the electromagnetic generation module and the radiation antenna, and the matching unit is configured to adjust the load impedance of the electromagnetic generation module according to the electromagnetic wave absorption rate.
  • the radiating antenna of the present invention is composed of a smooth curve, which can increase the distribution area of electromagnetic waves in a plane parallel to the radiating antenna, prevent the electromagnetic waves from being too concentrated, and thus avoid the problems of local food being overheated and uneven temperature.
  • the heating device of the present invention sets and fixes the radiating antenna through the radome, not only can the object to be processed and the radiating antenna be separated, preventing the radiating antenna from being dirty or damaged by accidental touch, but also simplifying the assembly process of the heating device, Facilitate the positioning and installation of radiating antenna.
  • the invention sets the radome at the height of 1/3 to 1/2 of the barrel, which not only avoids damage to the radome and radiating antenna due to the user placing too high objects to be processed, but also enables the electromagnetic waves in the heating chamber to have The higher energy density causes the object to be processed to be heated quickly.
  • the present invention adjusts the load impedance of the electromagnetic generation module through the matching unit, improves the matching degree of the output impedance of the electromagnetic generation module and the load impedance, and can place different fixed attributes (type, weight, volume, etc.) with different fixed properties in the heating chamber During the temperature change of food or food, more electromagnetic wave energy is radiated into the heating chamber.
  • FIG. 1 is a schematic structural diagram of a heating device according to an embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view of the heating device shown in FIG. 1, wherein the electromagnetic generation module and the power supply module are omitted;
  • FIG. 3 is a schematic enlarged view of area A in FIG. 2;
  • FIG. 4 is a schematic structural diagram of an electrical appliance room according to an embodiment of the present invention.
  • FIG. 5a is a schematic enlarged view of area B in FIG. 4;
  • 5b is a schematic diagram of a radiating antenna according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an electrical appliance room according to another embodiment of the present invention.
  • FIG. 7a is a schematic enlarged view of area C in FIG. 6;
  • FIG. 7b is a schematic diagram of a radiating antenna according to another embodiment of the present invention.
  • FIG. 8 is a three-dimensional magnetic field simulation diagram of the radiating antenna in FIG. 4;
  • FIG. 9 is a two-dimensional magnetic field simulation diagram of the radiating antenna in FIG. 8 on the plane where it is located;
  • FIG. 10 is a comparison diagram of the color and electric field intensity in FIGS. 8 and 9.
  • FIG. 1 is a schematic structural diagram of a heating device 100 according to an embodiment of the present invention
  • FIG. 2 is a schematic cross-sectional view of the heating device 100 shown in FIG. 1, wherein the electromagnetic generation module 161 and the power supply module 162 are omitted.
  • the heating device 100 may include a cylinder 110, a door 120, an electromagnetic generation module 161, a power supply module 162, and a radiation antenna 150.
  • a heating chamber 111 for picking and placing is defined in the cylinder 110, and the heating chamber 111 is used for placing the object to be processed.
  • the pick-and-place port can be opened in the front wall or the top wall of the heating chamber 111 to pick and place the object to be processed.
  • the door 120 can be installed with the cylinder 110 by a suitable method, such as sliding rail connection, hinge connection, etc., for opening and closing the access opening.
  • the heating device 100 further includes a drawer 140 for carrying the object to be processed.
  • the front end plate of the drawer 140 is configured to be fixedly connected to the door 120, and the two lateral side plates are movably connected to the barrel 110 through slide rails. .
  • the power supply module 162 may be configured to be electrically connected to the electromagnetic generation module 161 to provide electrical energy to the electromagnetic generation module 161, so that the electromagnetic generation module 161 generates an electromagnetic wave signal.
  • the radiation antenna 150 may be disposed in the barrel 110 and electrically connected to the electromagnetic generation module 161 to generate electromagnetic waves of corresponding frequencies according to the electromagnetic wave signal to heat the object to be processed in the barrel 110.
  • the cylinder body 110 and the door body 120 may be provided with electromagnetic shielding features, respectively, so that the door body 120 is electrically connected to the cylinder body 110 in the closed state to prevent electromagnetic leakage.
  • the barrel 110 may be made of metal to serve as a receiver to receive electromagnetic waves generated by the radiating antenna 150.
  • the top wall of the cylinder 110 may be provided with a receiving plate to receive the electromagnetic wave generated by the radiating antenna 150.
  • FIGS. 4 and 6 are schematic structural diagram of an electrical appliance room 112 according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of an electrical appliance room 112 according to another embodiment of the present invention.
  • the periphery of the radiating antenna 150 may be formed by a smooth curve to make the distribution of electromagnetic waves in the barrel 110 more uniform, thereby improving the temperature uniformity of the object to be processed.
  • the smooth curve refers to the curve equation is a continuous curve of the first derivative. In engineering, it means that the periphery of the radiation antenna 150 has no sharp corners.
  • Fig. 8 is a simulation diagram of the three-dimensional magnetic field of the radiating antenna in Fig. 4;
  • Fig. 10 is a comparison diagram of the color and electric field strength in Fig. 8 and Fig. 9, and E refers to the electric field strength in volts/meter (V_per_m).
  • V_per_m the electric field strength in volts/meter
  • FIG. 9 is a two-dimensional magnetic field simulation diagram of the radiating antenna in FIG. 8 on the plane where it is located.
  • the periphery of the radiating antenna is formed by a smooth curve, the area of the electromagnetic wave in the plane where the radiating antenna is concentrated is small, and the electromagnetic wave distribution at the periphery of the radiating antenna is relatively uniform, which will not cause local heating Even the phenomenon of fire.
  • the geometric center of the radiating antenna 150 coincides with the center of the cross-section 113 with the largest area taken by the heating chamber 111 along an imaginary plane parallel to the installation plane of the radiating antenna 150 to further improve the uniformity of the electromagnetic wave distribution in the heating chamber 111.
  • the radiating antenna 150 may have a perfect circular shape.
  • the radius R of the radiating antenna 150 is 5/13 to 13/20 of the shortest distance D from the periphery of the aforementioned section to the center, such as 5/13, 16/31, or 13/20, etc.
  • the heating chamber 111 has an electromagnetic wave with a large distribution area, a relatively uniform distribution, and a high energy density.
  • the radiating antenna 150 when the cross-section of the heating chamber 111 along the installation plane of the radiating antenna 150 is rectangular or rectangular, the radiating antenna 150 may be rectangular.
  • the length direction of the radiating antenna 150 may be parallel to the length direction of the aforementioned cross section, so that the electromagnetic wave distribution in the heating chamber 111 is uniform.
  • the length L of the radiating antenna 150 may be 9/20 to 7/10 of the length L 0 of the aforementioned cross section, for example, 9/20, 4/7, or 7/10.
  • the width W of the radiating antenna 150 may be 3/10 to 13/20 of the width W 0 of the aforementioned cross section, such as 3/10, 11/23, or 13/20, etc.; the size of the rounded corner of the radiating antenna 150 (to form the circle
  • the radius r of the arc of the angle represents 2/7 to 1/2 of the width of the radiating antenna 150, such as 2/7, 1/3, 2/5, or 1/2, so as to save the antenna material and make
  • the heating chamber 111 has electromagnetic waves with a large distribution area, a relatively uniform distribution, and a high energy density.
  • the heating device 100 may further include a radome 130 to divide the internal space of the barrel 110 into a heating chamber 111 and an electrical appliance chamber 112.
  • the to-be-processed object and the radiation antenna 150 may be respectively disposed in the heating chamber 111 and the electric appliance room 112 to separate the to-be-processed object and the radiation antenna 150 to prevent the radiation antenna 150 from being dirty or damaged by accidental touch.
  • the radome 130 may be made of an insulating material so that the electromagnetic waves generated by the radiating antenna 150 can pass through the radome 130 to heat the object to be processed. Further, the radome 130 may be made of a non-transparent material to reduce the electromagnetic loss of electromagnetic waves at the radome 130, thereby increasing the heating rate of the object to be treated.
  • the aforementioned non-transparent material is a translucent or opaque material.
  • the non-transparent material may be PP material, PC material or ABS material.
  • the radome 130 can also be used to fix the radiation antenna 150 to simplify the assembly process of the heating device 100 and facilitate the positioning and installation of the radiation antenna 150.
  • the radome 130 may include a partition 131 partitioning the heating chamber 111 and the electrical appliance chamber 112, and a skirt 132 fixedly connected to the inner wall of the barrel 110.
  • the radiation antenna 150 may be fixedly connected to the partition 131.
  • the radiating antenna 150 may be configured to be fixedly connected to the radome 130.
  • FIG. 5a is a schematic enlarged view of area B in FIG. 4.
  • the radiating antenna 150 may be formed with a plurality of snap holes 151, and the radome 130 may be correspondingly formed with a plurality of snaps 133, and the multiple snaps 133 are configured to pass through the multiple snap holes 151 and the radiating antenna, respectively 150 card connection.
  • the buckle 133 may be composed of two barbs arranged at intervals and mirror-symmetrical.
  • Fig. 7a is a schematic enlarged view of the area C in Fig. 6.
  • the buckle 133 may be composed of a fixing portion perpendicular to the radiating antenna 150 and hollow in the middle, and an elastic portion whose inner end edge is inclined to the fixing portion and extends toward the antenna.
  • the radiating antenna 150 may be configured to be fixed to the radome 130 through an electroplating process.
  • the radome 130 may be disposed at the bottom of the barrel 110 to prevent the radome 130 from being damaged by the user placing too high a to-be-processed object.
  • the radiation antenna 150 may be horizontally fixed to the lower surface of the partition 131.
  • the radiating antenna 150 may be disposed at a height of 1/3 to 1/2 of the barrel 110, for example, 1/3, 2/5, or 1/2, so that the volume of the heating chamber 111 is large, and at the same time, the heating chamber 111
  • the electromagnetic wave has a high energy density, which in turn causes the object to be processed to be quickly heated.
  • the detection unit 171 may be connected in series between the electromagnetic generation module 161 and the radiation antenna 150, and is configured to detect specific parameters of the incident wave signal and the reflected wave signal passing therethrough in real time.
  • the control unit 172 may be configured to acquire the specific parameter from the detection unit 171, and calculate the power of the incident wave and the reflected wave according to the specific parameter.
  • the specific parameter may be a voltage value and/or a current value.
  • the detection unit 171 may also be a power meter to directly measure the power of the incident wave and the reflected wave.
  • the control unit 172 may further calculate the electromagnetic wave absorption rate of the object to be processed according to the power of the incident wave and the reflected wave, and compare the electromagnetic wave absorption rate with the preset absorption threshold, and send the adjustment to the matching unit 173 when the electromagnetic wave absorption rate is less than the preset absorption threshold instruction.
  • the preset absorption threshold may be 60-80%, such as 60%, 70%, or 80%.
  • the control unit 172 can also be configured to receive user instructions and control the electromagnetic generation module 161 to start working according to the user instructions, wherein the control unit 172 is configured to be electrically connected to the power supply module 162 to obtain power from the power supply module 162 and remain in a standby state all the time.
  • the signal processing and measurement and control circuit 170 may be integrated into a circuit board and horizontally disposed in the electrical room 112 to facilitate the electrical connection of the radiation antenna 150 and the matching module.
  • the radome 130 and the barrel 110 may be respectively provided with heat dissipation holes 190 at positions corresponding to the matching units 173, so that the heat generated when the matching unit 173 works is discharged through the heat dissipation holes 190.
  • the signal processing and measurement and control circuit 170 may be disposed on the rear side of the radiation antenna 150.
  • the heat dissipation hole 190 may be opened in the rear wall of the radome 130 and the barrel 110.
  • the metal cylinder 110 may be set to be grounded to discharge the electric charge thereon, thereby improving the safety of the heating device 100.
  • the heating device 100 may further include a metal bracket 180.
  • the metal bracket 180 may be configured to connect the circuit board and the barrel 110 to support the circuit board and discharge the charge on the circuit board through the barrel 110.
  • the metal bracket 180 may be composed of two parts perpendicular to each other.
  • the electromagnetic generation module 161 and the power supply module 162 may be disposed outside the barrel 110.
  • a part of the metal bracket 180 may be provided at the rear of the circuit board and extend vertically in the lateral direction, and it may be provided with two wiring ports, so that the wiring terminals of the detection unit 171 (or matching unit 173) protrude from one wiring port
  • the electromagnetic generation module 161 is electrically connected, and the connection terminal of the control unit 172 extends from the other connection port and is electrically connected to the electromagnetic generation module 161 and the power supply module 162.
  • the heating device 100 may be provided in the storage compartment of the refrigerator to facilitate the user to defrost food.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Food Science & Technology (AREA)
  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

一种加热装置（100）和冰箱。加热装置（100）包括筒体（110）、门体（120）、电磁发生模块（161）和辐射天线（150）。筒体（110）内限定有具有取放口的加热室（111），加热室（111）用于放置待处理物。门体（120）设置于取放口处，用于开闭取放口。电磁发生模块（161）配置为产生电磁波信号。辐射天线（150）设置于所述筒体（110）内并与电磁发生模块（161）电连接，以根据电磁波信号产生相应频率的电磁波。辐射天线（150）的周缘由平滑曲线构成，可提高电磁波在平行于辐射天线（150）的平面的分布面积，避免电磁波过于集中，进而可避免出现食物局部被过度加热、温度不均匀的问题。

Description

加热装置 技术领域
本发明涉及厨房用具，特别是涉及一种电磁波加热装置。
背景技术
食物在冷冻的过程中，食物的品质得到了保持，然而冷冻的食物在加工或食用前需要解冻。为了便于用户冷冻和解冻食物，现有技术一般通过电磁波装置来解冻食物。
解冻后食物的温度均匀性与加热室内电磁波的分布均匀性密切相关，当辐射天线与位于其周向上的加热室内壁存在间隙时，加热室内的电磁波会因辐射天线的边缘效应集中分布在辐射天线的周缘处。综合考虑，在设计上需要一种电磁波分布均匀的电磁波加热装置。
发明内容
本发明的一个目的是要提供一种电磁波分布均匀的加热装置。
本发明一个进一步的目的是要提高加热装置的装配效率。
本发明另一个进一步的目的是要提高加热效率。
特别地，本发明提供了一种加热装置，包括：
筒体，其内限定有具有取放口的加热室，所述加热室用于放置待处理物；
门体，设置于所述取放口处，用于开闭所述取放口；
电磁发生模块，配置为产生电磁波信号；和
辐射天线，设置于所述筒体内并与所述电磁发生模块电连接，以根据所述电磁波信号产生相应频率的电磁波；其特征在于，
所述辐射天线的周缘由平滑曲线构成，以使所述加热室内的电磁波分布更加均匀。
可选地，所述辐射天线的几何中心与所述加热室沿所述辐射天线的安装平面截取的截面的中心重合。
可选地，所述辐射天线呈正圆形。
可选地，所述辐射天线的半径为所述截面的周缘距其中心的最短距离的5/13～13/20。
可选地，所述截面为矩形或矩圆形；且
所述辐射天线呈矩圆形，且所述辐射天线的长度方向与所述截面的长度方向平行。
可选地，所述辐射天线的长度为所述截面的长度的9/20～7/10；且
所述辐射天线的宽度为所述截面的宽度的3/10～13/20
所述辐射天线的圆角为所述辐射天线的宽度的2/7～1/2。
可选地，所述筒体由金属制成；且
所述辐射天线水平地设置于所述筒体的1/3～1/2高度处。
可选地，所述加热装置还包括：
天线罩，由绝缘材料制成，设置为将所述筒体的内部空间分隔为所述加热室和电器室，其中所述辐射天线设置于所述电器室内并与所述天线罩固定连接。
可选地，所述辐射天线形成有多个卡接孔；且
所述天线罩对应地形成有多个卡扣，所述多个卡扣设置为分别穿过所述多个卡接孔与所述辐射天线卡接；其中
所述卡扣由间隔设置且镜像对称的两个倒勾组成；或
所述卡扣由垂直于所述辐射天线并中部中空的固定部、和自所述固定部的内端缘倾斜于固定部向辐射天线延伸的弹性部组成。
可选地，所述加热装置还包括：
信号处理及测控电路，设置于所述电器室内，其包括：
检测单元，串联在所述电磁发生模块与辐射天线之间，且所述检测单元配置为检测经过其的入射波信号和反射波信号的特定参数；
控制单元，配置为根据所述特定参数计算待处理物的电磁波吸收率；和
匹配单元，串联在所述电磁发生模块与辐射天线之间，且所述匹配单元配置为根据所述电磁波吸收率调节所述电磁发生模块的负载阻抗。
本发明的辐射天线由于周缘由平滑曲线构成，可提高电磁波在平行于辐射天线的平面的分布面积，避免电磁波过于集中，进而可避免出现食物局部被过度加热、温度不均匀的问题。
进一步地，本发明的加热装置通过天线罩罩设并固定辐射天线，不仅可将待处理物和辐射天线分隔开，防止辐射天线脏污或误触损坏，还可简化加热装置的装配流程、便于辐射天线的定位安装。
进一步地，本发明将天线罩设置在筒体的1/3～1/2高度处，不仅可避免因用户放置过高的待处理物损坏天线罩和辐射天线，还可以使加热室内的电磁波具有较高的能量密度，进而使待处理物被快速地加热。
进一步地，本发明通过匹配单元对电磁发生模块的负载阻抗进行调节，提高电磁发生模块的输出阻抗和负载阻抗的匹配度，可在加热室内放置有固定属性(种类、重量、体积等)不同的食物、或食物在温度变化过程中均有较多的电磁波能量被辐射在加热室内。
根据下文结合附图对本发明具体实施例的详细描述，本领域技术人员将会更加明了本发明的上述以及其他目的、优点和特征。
附图说明
后文将参照附图以示例性而非限制性的方式详细描述本发明的一些具体实施例。附图中相同的附图标记标示了相同或类似的部件或部分。本领域技术人员应该理解，这些附图未必是按比例绘制的。附图中：
图1是根据本发明一个实施例的加热装置的示意性结构图；
图2是图1所示加热装置的示意性剖视图，其中电磁发生模块和供电模块被省略；
图3是图2中区域A的示意性放大视图；
图4是本发明一个实施例的电器室的示意性结构图；
图5a是图4中区域B的示意性放大视图；
图5b是本发明一个实施例的辐射天线的示意图；
图6是本发明另一个实施例的电器室的示意性结构图；
图7a是图6中区域C的示意性放大视图；
图7b是本发明另一个实施例的辐射天线的示意图；
图8是图4中辐射天线的三维磁场仿真图；
图9是图8中辐射天线在其所在平面的二维磁场仿真图；
图10是图8和图9中的颜色与电场强度比对图。
具体实施方式
图1是根据本发明一个实施例的加热装置100的示意性结构图；图2是图1所示加热装置100的示意性剖视图，其中电磁发生模块161和供电模块162被省略。参见图1和图2，加热装置100可包括筒体110、门体120、电 磁发生模块161、供电模块162、和辐射天线150。
筒体110内限定有取放口的加热室111，加热室111用于放置待处理物。取放口可开设于加热室111的前壁或顶壁，以取放待处理物。
门体120可通过适当方法与筒体110安装在一起，例如滑轨连接、铰接等，用于开闭取放口。在图示实施例中，加热装置100还包括用于承载待处理物的抽屉140，抽屉140的前端板设置为与门体120固定连接，两个横向侧板通过滑轨与筒体110活动连接。
供电模块162可设置为与电磁发生模块161电连接，以为电磁发生模块161提供电能，进而使电磁发生模块161产生电磁波信号。辐射天线150可设置于筒体110内并与电磁发生模块161电连接，以根据电磁波信号产生相应频率的电磁波，对筒体110内的待处理物进行加热。
在一些实施例中，筒体110和门体120可分别设置有电磁屏蔽特征，使门体120在关闭状态时与筒体110导电连接，以防止电磁泄露。
在一些实施例中，筒体110可由金属制成，以作为接收极接收辐射天线150产生的电磁波。在另一些实施例中，筒体110的顶壁可设置有接收极板，以接收辐射天线150产生的电磁波。
图4是本发明一个实施例的电器室112的示意性结构图；图6是本发明另一个实施例的电器室112的示意性结构图。参见图4和图6，辐射天线150的周缘可由平滑曲线构成，以使筒体110内电磁波的分布更加均匀，进而提高待处理物的温度均匀性。其中，平滑曲线指曲线方程为一阶导数连续的曲线。在工程中意味着辐射天线150的周缘无尖角。
图8是图4中辐射天线的三维磁场仿真图；图10是图8和图9中的颜色与电场强度比对图，E field指电场强度，单位为伏特/米(V_per_m)。由图8和图10可以看出，当辐射天线的周缘由平滑曲线构成时，辐射天线的上方(加热室111内)的电磁波分布较均匀，不仅电磁波在水平方向具有较大的分布范围，而且电磁波分布均匀、磁场强度基本相等。
图9是图8中辐射天线在其所在平面的二维磁场仿真图。由图9和图10可以看出，当辐射天线的周缘由平滑曲线构成时，电磁波在辐射天线所在平面较集中的区域面积较小，辐射天线周缘处的电磁波分布相对均匀，不会造成局部发热甚至打火现象。
参见图2，辐射天线150的几何中心与加热室111沿平行于辐射天线150 的安装平面的假想平面截取的面积最大的截面113的中心重合，以进一步提高加热室111内电磁波的分布均匀性。
在一些实施例中，参见图5b，辐射天线150可呈正圆形。在该实施例中，辐射天线150的半径R为前述截面的周缘距其中心的最短距离D的5/13～13/20，例如5/13、16/31或13/20等，以在节约天线材料的同时，使加热室111内具有分布面积较大、分布较均匀、且能量密度较高的电磁波。
在另一些实施例中，参见图7b，当加热室111沿辐射天线150的安装平面截取的截面矩形或矩圆形时，辐射天线150可呈矩圆形。辐射天线150的长度方向可与前述截面的长度方向平行，以使加热室111内的电磁波分布均匀。
在辐射天线150呈矩圆形的实施例中，辐射天线150的长度L可为前述截面的长度L 0的9/20～7/10，例如9/20、4/7或7/10等；辐射天线150的宽度W可为前述截面的宽度W 0的3/10～13/20，例如3/10、11/23或13/20等；辐射天线150的圆角的尺寸(以形成该圆角的圆弧的半径r表示)为辐射天线150的宽度的2/7～1/2，例如2/7、1/3、2/5或1/2，以在节约天线材料的同时，使加热室111内具有分布面积较大、分布较均匀、且能量密度较高的电磁波。
参见图2和图4，加热装置100还可包括天线罩130，以将筒体110的内部空间分隔为加热室111和电器室112。待处理物和辐射天线150可分别设置于加热室111和电器室112，以将待处理物和辐射天线150分隔开，防止辐射天线150脏污或误触损坏。
在一些实施例中，天线罩130可由绝缘材料制成，以使辐射天线150产生的电磁波可穿过天线罩130加热待处理物。进一步地，天线罩130可由非透明材料制成，以减少电磁波在天线罩130处的电磁损耗，进而提高对待处理物的加热速率。前述非透明材料为半透明或不透明的材料。非透明材料可为PP材料、PC材料或ABS材料等。
天线罩130还可用于固定辐射天线150，以简化加热装置100的装配流程、便于辐射天线150的定位安装。具体地，天线罩130可包括分隔加热室111和电器室112的隔板131、以及与筒体110内壁固定连接的裙部132。其中，辐射天线150可设置为与隔板131固定连接。
在一些实施例中，辐射天线150可设置为与天线罩130卡固连接。图5a 是图4中区域B的示意性放大视图。参见图5a，辐射天线150可形成有多个卡接孔151，天线罩130可对应地形成有多个卡扣133，多个卡扣133设置为分别穿过多个卡接孔151与辐射天线150卡接。
在本发明的一个实施例中，卡扣133可由间隔设置且镜像对称的两个倒勾组成。
图7a是图6中区域C的示意性放大视图。参见图7a，在本发明的另一个实施例中，卡扣133可由垂直于辐射天线150并中部中空的固定部和自固定部的内端缘倾斜于固定部向天线延伸的弹性部组成。
在另一些实施例中，辐射天线150可设置为通过电镀工艺固定于天线罩130。
天线罩130还可包括多个加强筋，该加强筋设置为连接隔板131和裙部132，以提高天线罩130的结构强度。
在一些实施例中，天线罩130可设置于筒体110的底部，以避免因用户放置过高的待处理物损坏天线罩130。辐射天线150可水平地固定于隔板131的下表面。
辐射天线150可设置于筒体110的1/3～1/2高度处，例如1/3、2/5或1/2，以使加热室111的容积较大的同时，使加热室111内的电磁波具有较高的能量密度，进而使待处理物被快速地加热。
图3是图2中区域A的示意性放大视图。参见图1至图3，加热装置100还可包括信号处理及测控电路170。具体地，信号处理及测控电路170可包括检测单元171、控制单元172、和匹配单元173。
检测单元171可串联在电磁发生模块161与辐射天线150之间，并配置为实时检测经过其的入射波信号和反射波信号的特定参数。
控制单元172可配置为从检测单元171获取该特定参数，根据该特定参数计算入射波和反射波的功率。在本发明中，特定参数可为电压值和/或电流值。检测单元171也可为功率计，以直接测得入射波和反射波的功率。
控制单元172可进一步根据入射波和反射波的功率计算待处理物的电磁波吸收率，并将电磁波吸收率与预设吸收阈值比较，当电磁波吸收率小于预设吸收阈值时向匹配单元173发送调节指令。预设吸收阈值可为60～80％，例如60％、70％、或80％。
匹配单元173可串联在电磁发生模块161与辐射天线150之间，并配置 为根据控制单元172的调节指令对电磁发生模块161的负载阻抗进行调节，提高电磁发生模块161的输出阻抗和负载阻抗的匹配度，以在加热室111内放置有固定属性(种类、重量、体积等)不同的食物、或食物在温度变化过程中均有较多的电磁波能量被辐射在加热室111内，进而提高加热速率。
在一些实施例中，加热装置100可用于解冻。控制单元172还可配置为根据入射波和反射波的功率计算待处理物的介电系数的虚部变化率，并将虚部变化率与预设变化阈值比较，当待处理物介电系数的虚部变化率大于等于预设变化阈值时向电磁发生模块161发送停止指令，使电磁发生模块161停止工作，解冻程序终止。
预设变化阈值可通过测试不同固定属性的食物在-3～0℃时的介电系数的虚部变化率获得，以使食物具有较好的剪切强度。例如当待处理物为生牛肉时，预设变化阈值可设置为2。
控制单元172还可配置为接收用户指令并根据用户指令控制电磁发生模块161开始工作，其中控制单元172配置为与供电模块162电连接，以从供电模块162获取电能并一直处于待机状态。
在一些实施例中，信号处理及测控电路170可集成于一块电路板，并水平地设置于电器室112内，以便于辐射天线150与匹配模块的电连接。
天线罩130与筒体110对应匹配单元173的位置处可分别开设有散热孔190，以使匹配单元173工作时产生的热量经散热孔190排出。在一些实施例中，信号处理及测控电路170可设置于辐射天线150的后侧。散热孔190可开设于天线罩130和筒体110的后壁。
在一些实施例中，金属筒体110可设置为接地，以将其上的电荷导出，提高加热装置100的安全性。
加热装置100还可包括金属支架180。金属支架180可设置为连接电路板与筒体110，以支撑电路板并将电路板上的电荷经由筒体110导出。在一些实施例中，金属支架180可由互相垂直的两部分组成。
在一些实施例中，电磁发生模块161和供电模块162可设置于筒体110外侧。一部分金属支架180可设置于电路板的后部并沿横向方向竖直延伸，且其可开设有两个接线口，使检测单元171(或匹配单元173)的接线端子自一个接线口伸出与电磁发生模块161电连接，控制单元172的接线端子自另一个接线口伸出与电磁发生模块161和供电模块162电连接。
在一些实施例中，加热装置100可设置于冰箱的储物间室，以便于用户解冻食材。
至此，本领域技术人员应认识到，虽然本文已详尽示出和描述了本发明的多个示例性实施例，但是，在不脱离本发明精神和范围的情况下，仍可根据本发明公开的内容直接确定或推导出符合本发明原理的许多其他变型或修改。因此，本发明的范围应被理解和认定为覆盖了所有这些其他变型或修改。

Claims (10)

  1. 一种加热装置，包括：
    筒体，其内限定有具有取放口的加热室，所述加热室用于放置待处理物；
    门体，设置于所述取放口处，用于开闭所述取放口；
    电磁发生模块，配置为产生电磁波信号；和
    辐射天线，设置于所述筒体内并与所述电磁发生模块电连接，以根据所述电磁波信号产生相应频率的电磁波；其中，
    所述辐射天线的周缘由平滑曲线构成，以使所述加热室内的电磁波分布更加均匀。
  2. 根据权利要求1所述的加热装置，其中，
    所述辐射天线的几何中心与所述加热室沿平行于所述辐射天线的安装平面的假想平面截取的最大截面的中心重合。
  3. 根据权利要求2所述的加热装置，其中，
    所述辐射天线呈正圆形。
  4. 根据权利要求3所述的加热装置，其中，
    所述辐射天线的半径为所述截面的周缘距其中心的最短距离的5/13～13/20。
  5. 根据权利要求2所述的加热装置，其中，
    所述截面为矩形或矩圆形；且
    所述辐射天线呈矩圆形，且所述辐射天线的长度方向与所述截面的长度方向平行。
  6. 根据权利要求5所述的加热装置，其中，
    所述辐射天线的长度为所述截面的长度的9/20～7/10；和/或
    所述辐射天线的宽度为所述截面的宽度的3/10～13/20；和/或
    所述辐射天线的圆角为所述辐射天线的宽度的2/7～1/2。
  7. 根据权利要求1所述的加热装置，其中，
    所述筒体由金属制成；且
    所述辐射天线水平地设置于所述筒体的1/3～1/2高度处。
  8. 根据权利要求1所述的加热装置，还包括：
    天线罩，由绝缘材料制成，设置为将所述筒体的内部空间分隔为所述加热室和电器室，其中所述辐射天线设置于所述电器室内并与所述天线罩固定连接。
  9. 根据权利要求8所述的加热装置，其中，
    所述辐射天线形成有多个卡接孔；且
    所述天线罩对应地形成有多个卡扣，所述多个卡扣设置为分别穿过所述多个卡接孔与所述辐射天线卡接；其中
    所述卡扣由间隔设置且镜像对称的两个倒勾组成；或
    所述卡扣由垂直于所述辐射天线并中部中空的固定部、和自所述固定部的内端缘倾斜于固定部向辐射天线延伸的弹性部组成。
  10. 根据权利要求8所述的加热装置，还包括：
    信号处理及测控电路，设置于所述电器室内，其包括：
    检测单元，串联在所述电磁发生模块与辐射天线之间，且所述检测单元配置为检测经过其的入射波信号和反射波信号的特定参数；
    控制单元，配置为根据所述特定参数计算待处理物的电磁波吸收率；和
    匹配单元，串联在所述电磁发生模块与辐射天线之间，且所述匹配单元配置为根据所述电磁波吸收率调节所述电磁发生模块的负载阻抗。
PCT/CN2020/070342 2019-01-04 2020-01-03 加热装置 Ceased WO2020140988A1 (zh)

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