WO2020140989A1 - 加热装置 - Google Patents

加热装置 Download PDF

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Publication number
WO2020140989A1
WO2020140989A1 PCT/CN2020/070343 CN2020070343W WO2020140989A1 WO 2020140989 A1 WO2020140989 A1 WO 2020140989A1 CN 2020070343 W CN2020070343 W CN 2020070343W WO 2020140989 A1 WO2020140989 A1 WO 2020140989A1
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WO
WIPO (PCT)
Prior art keywords
edge
central portion
heating device
electromagnetic
central
Prior art date
Application number
PCT/CN2020/070343
Other languages
English (en)
French (fr)
Inventor
王海娟
李鹏
Original Assignee
海尔智家股份有限公司
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 海尔智家股份有限公司 filed Critical 海尔智家股份有限公司
Priority to US17/420,445 priority Critical patent/US20220086963A1/en
Priority to AU2020205145A priority patent/AU2020205145B2/en
Priority to EP20736226.0A priority patent/EP3905849B1/en
Publication of WO2020140989A1 publication Critical patent/WO2020140989A1/zh

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    • 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
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/36—Freezing; Subsequent thawing; Cooling
    • A23L3/365—Thawing subsequent to freezing
    • 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
    • H05B6/46—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

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.
  • the radiation antenna is arranged to cover at least one inner wall of the heating chamber, so that the food is defrosted evenly.
  • this solution not only has a high production cost, but also cannot solve the problem that the electromagnetic waves are concentrated at the periphery of the antenna, which causes local heating or even ignition of the antenna.
  • an electromagnetic wave heating device with low production cost and uniform electromagnetic wave distribution is required in design.
  • An object of the present invention is to provide an electromagnetic wave heating device with low production cost and uniform electromagnetic wave distribution.
  • 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 radiating antenna is arranged to arch toward the object to be processed, so that the electromagnetic wave distribution in the heating chamber is more uniform.
  • the radiating antenna includes:
  • the connecting portion is provided to connect the center portion and the edge portion.
  • the connecting portion is provided to gradually extend from the peripheral edge of the central portion to the inner peripheral edge of the edge portion.
  • connection part includes:
  • the first circular arc segment is arranged to extend from the peripheral edge of the central portion toward the edge portion and is tangent to the central portion;
  • a straight line segment set to be tangent to the first arc segment
  • the second arc segment is arranged to connect the outer periphery of the straight segment and the inner periphery of the edge, and is tangent to the straight segment and the edge.
  • the geometric centers of the central portion, the connecting portion, and the edge portion all coincide with the center of the largest cross section of the heating chamber taken along an imaginary plane parallel to the central portion.
  • the central portion has a rectangular shape
  • the longitudinal direction of the central portion is parallel to the longitudinal direction of the cross-section.
  • the length of the central portion is 0.386 to 0.522 of the length of the cross-section; and/or
  • the width of the central portion is 0.19 to 0.471 of the width of the cross-section;
  • the radius of the center portion is 0.2-0.4 of the width of the center portion
  • the length of the outer edge of the edge is 0.519 to 0.674 of the length of the cross-section; and/or
  • the width of the outer edge of the edge portion is 0.38 to 0.62 of the width of the cross-section; and/or
  • the fillet radius of the outer end edge of the edge portion is 0.2 to 0.4 of the width of the outer end edge of the edge portion;
  • the radius of the first circular arc segment is greater than or equal to 1/3 of the distance between the central portion and the edge portion perpendicular to the central portion;
  • the angle between the straight line segment and the central part is 120°-160°;
  • the radius of the second arc segment is greater than or equal to 1/6 of the distance between the central portion and the edge portion perpendicular to the central portion.
  • the central portion extends horizontally;
  • the central portion is provided at a height of 0.285-0.5 of the cylinder.
  • the edge portion is provided at a height of 0.19 to 0.334 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 barrel into an electrical appliance room and the heating room;
  • the radiating antenna is installed in the electric appliance room and its central part is fixedly connected to the radome.
  • a plurality of snap holes are formed in the central portion;
  • the radome is correspondingly formed with a plurality of buckles, and the plurality of buckles are configured to respectively buckle with the central portion through the plurality of buckling holes;
  • the buckle is composed of a fixing portion perpendicular to the center portion and hollow in the middle, and an elastic portion inclined from the inner end edge of the fixing portion to the fixing portion and extending toward the center portion.
  • the present invention creatively sets the radiating antenna to be arched toward the object to be processed, which can relatively reduce the distance from the center of the radiating antenna to the receiving pole and increase the distance from the peripheral edge of the radiating antenna to the receiving pole, thereby eliminating the edge effect
  • the influence of the uniformity of the electromagnetic wave distribution in the heating chamber not only improves the uniformity of the electromagnetic wave distribution while solving the production cost, but also increases the energy density and distribution range of the electromagnetic wave.
  • 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. 5 is a schematic enlarged view of area B in FIG. 4;
  • FIG. 6 is a schematic screenshot of the heating device taken in the lateral direction and the vertical direction;
  • FIG. 7 is a schematic screenshot of the heating device taken in the front-rear direction and the vertical direction;
  • FIG. 8 is a test diagram of a radiating antenna according to an embodiment of the present invention.
  • FIG. 9 is a simulation diagram of the electromagnetic wave distribution measured based on FIG. 8.
  • FIG. 10 is a test chart of a comparative radiating antenna according to the present invention.
  • Fig. 11 is a simulation diagram of the electromagnetic wave distribution measured based on Fig. 10.
  • 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 radiating antenna 150 When the access port is opened in the front wall of the barrel 110, the radiating antenna 150 may be disposed on the top, bottom, lateral sides, or rear of the barrel 110. When the pick-and-place port is opened on the top wall of the barrel 110, the radiating antenna 150 may be disposed on the peripheral side or bottom of the barrel 110. Preferably, the radiating antenna 150 is disposed at the bottom of the barrel 110 to avoid damage to the antenna due to excessively high objects to be placed in the drawer 140, and the drawer 140 may be used to hide the antenna.
  • 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.
  • the radiating antenna 150 may be configured to arch upward to relatively reduce the distance from the center of the radiating antenna 150 to the top wall of the barrel 110 and increase the distance from the circumference of the radiating antenna 150 to the top wall of the barrel 110, and Eliminate the influence of edge effects on the uniformity of electromagnetic wave distribution in the heating chamber 111, while increasing the uniformity of electromagnetic wave distribution, increase the energy density and distribution range of electromagnetic waves.
  • the edge effect means that the magnetic field strength at the periphery of the antenna is much higher than the magnetic strength at the center.
  • the radiating antenna 150 may include a central portion 150a, an edge portion 150c, and a connecting portion 150b connecting the central portion 150a and the edge portion 150c.
  • the central portion 150a may extend in the horizontal direction.
  • the edge portion 150c may be disposed below the center portion 150a and extend parallel to the center portion 150a.
  • the connecting portion 150b may be provided to gradually extend from the peripheral edge of the central portion 150a to the inner peripheral edge of the edge portion 150c to further improve the uniformity of the distribution of electromagnetic waves in the heating chamber 111.
  • the connecting portion 150b may include a first circular arc segment, a straight segment, and a second circular arc segment that are sequentially connected from the peripheral edge of the central portion 150a to the inner peripheral edge of the edge portion 150c.
  • the first circular arc segment can be set to be tangent to the central portion 150a
  • the linear segment can be set to be tangent to the first circular segment
  • the second circular segment can be set to be tangent to the linear segment and the edge portion 150c to avoid An edge effect is formed at the sharp corners to further improve the uniformity of the electromagnetic wave distribution in the heating chamber 111.
  • the geometric centers of the central portion 150a, the connecting portion 150b, and the edge portion 150c all coincide with the center of the largest cross-sectional area of the heating chamber 111 along the horizontally extending imaginary plane, so that the electromagnetic waves in the heating chamber 111 Evenly distributed.
  • the heating chamber 111 may have a rectangular shape.
  • the central portion 150a may have a rectangular shape, and the longitudinal direction of the central portion 150a may be parallel to the longitudinal direction of the aforementioned cross section, so that the electromagnetic waves in the heating chamber 111 are more uniformly distributed.
  • the length w 1 of the central portion 150a may be 0.386 to 0.522 of the length W of the aforementioned cross-section, such as 0.386, 0.45, or 0.522.
  • the width d 1 of the central portion 150a may be 0.19 to 0.471 of the width D of the aforementioned cross section, for example, 0.19, 0.2, 0.375, 0.471, and the like.
  • the fillet radius of the central portion 150a may be 0.2 to 0.4 of the width d 1 of the central portion 150a, for example, 0.2, 0.33, or 0.4.
  • the length w 2 of the outer edge of the edge portion 150c may be 0.519 to 0.674, such as 0.519, 0.6, or 0.674, which is the length W of the aforementioned cross-section.
  • the width d 2 of the outer edge of the edge portion 150c may be 0.38 to 0.62 of the width D of the aforementioned cross section, for example, 0.38, 0.5, or 0.62.
  • the fillet radius of the outer end edge of the edge portion 150c may be 0.2 to 0.4 of the outer end edge width d 2 of the edge portion 150c, for example, 0.2, 0.33, or 0.4.
  • the radius r 1 of the first circular arc segment may be greater than or equal to 1/3 of the vertical distance (h 1 -h 2 ) between the central portion 150a and the edge portion 150c, for example, the central portion 150a and the edge portion 150c may be vertical 1/3, 2/5, or 1/2 of the pitch in the vertical direction.
  • the angle ⁇ between the straight line segment and the central portion 150a may be 120°-160°, such as 120°, 140°, or 160°.
  • the radius r 2 of the second circular arc segment may be greater than or equal to 1/6 of the distance (h 1 -h 2 ) between the central portion 150a and the edge portion 150c, for example, the vertical distance between the central portion 150a and the edge portion 150c 1/6, 1/5, 1/3, or 1/2 etc.
  • the production cost can be saved, and the electromagnetic waves in the heating chamber 111 can have a large distribution area in the horizontal direction.
  • 150a may be disposed at the central portion of 0.285 to 0.5 of the height of the cylindrical body 110 (h 1 / H), and the like e.g. 0.285,0.292,0.33,0.4, or 0.5.
  • At the edge portion 150c may be disposed at the height of 0.19 to 0.334 of the cylindrical body 110 (h 2 / H), and the like e.g. 0.19,0.195,0.2,0.25, or 0.334.
  • the present invention limits the installation height of the radiation antenna 150 in the vertical direction, so that the volume of the heating chamber 111 can be larger, and the electromagnetic wave in the heating chamber 111 can have a higher energy density.
  • FIG. 10 is a test diagram of a comparative radiating antenna according to the present invention.
  • the radiating antenna is a flat antenna, and the antenna is rectangular, with a length of 205 mm, a width of 115 mm, a radius of 38 mm, and a distance of 50 mm from the bottom wall of the antenna.
  • FIG. 9 is a simulation diagram of the electromagnetic wave distribution measured by FIG. 8
  • FIG. 11 is a simulation diagram of the electromagnetic wave distribution measured by FIG.
  • the simulation diagrams of FIG. 9 and the simulation diagram of FIG. 11 are set to be such that when the magnetic field strength at any spatial point in the cylinder is greater than an intensity value (the intensity value is When the difference between the magnetic field strength at the center of the antenna of the eighth embodiment and the magnetic field strength at the center of the antenna of the comparative example in FIG. 10), the spatial point is shown as having electromagnetic waves.
  • the radiating antenna 150 of the embodiment of the present invention has no hidden danger of magnetic field concentration, and the electromagnetic wave distribution is uniform and the distribution range is large.
  • Table 1 is the electric field strength test table in FIG. 9;
  • Table 2 is the electric field strength test table in FIG.
  • the radiating antenna 150 of the embodiment of the present invention has a higher electric field strength at the same spatial point of the cylinder than the flat antenna of the comparative example, that is, the electromagnetic wave at this spatial point The higher the energy density, the higher the heating efficiency.
  • 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 center portion 150a of 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. 5 is a schematic enlarged view of area B in FIG. 4. Referring to FIG. 5, 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 respectively disposed through the multiple snap holes 151 and the radiating antenna 150 card connection.
  • 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 inclined from the inner end edge of the fixing portion to the antenna extending from the fixing portion to the antenna.
  • the radome 130 may further include a plurality of reinforcing ribs, which are configured to connect the partition plate 131 and the skirt 132 to improve the structural strength of the radome 130.
  • FIG. 3 is a schematic enlarged view of area A in FIG. 2.
  • the heating device 100 may further include a signal processing and measurement and control circuit 170.
  • the signal processing and measurement and control circuit 170 may include a detection unit 171, a control unit 172, and a matching unit 173.
  • 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 matching unit 173 may be connected in series between the electromagnetic generation module 161 and the radiating antenna 150, and is configured to adjust the load impedance of the electromagnetic generation module 161 according to the adjustment instruction of the control unit 172, thereby improving the output impedance and load impedance of the electromagnetic generation module 161 Matching degree, to place food with different fixed properties (type, weight, volume, etc.) in the heating chamber 111, or during the temperature change of food, more electromagnetic wave energy is radiated in the heating chamber 111, thereby improving heating rate.
  • the heating device 100 may be used for thawing.
  • the control unit 172 may also be configured to calculate the change rate of the imaginary part of the dielectric coefficient of the object to be processed according to the power of the incident wave and the reflected wave, and compare the change rate of the imaginary part with a preset change threshold. When the change rate of the imaginary part is greater than or equal to the preset change threshold, a stop instruction is sent to the electromagnetic generation module 161 to stop the electromagnetic generation module 161 from working, and the defrosting program is terminated.
  • the preset change threshold can be obtained by testing the change rate of the imaginary part of the dielectric constant of foods with different fixed properties at -3 ⁇ 0 °C, so that the food has a better shear strength. For example, when the object to be processed is raw beef, the preset change threshold may be set to 2.
  • 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 metal bracket 180 may be fixedly connected to the circuit board and the cylinder 110 in advance.
  • 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 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 heating device 100 may be provided in the storage compartment of the refrigerator to facilitate the user to defrost food.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Nutrition Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Food Science & Technology (AREA)
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  • Constitution Of High-Frequency Heating (AREA)

Abstract

一种加热装置，该加热装置包括筒体（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），所述加热室（111）用于放置待处理物。门体（120）设置于所述取放口处，用于开闭所述取放口。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）内并与所述电磁发生模块（161）电连接，以根据所述电磁波信号产生相应频率的电磁波。辐射天线（150）设置为向靠近待处理物的方向拱起，以消除边缘效应对加热室（111）内电磁波分布均匀性的影响，在解决生产成本的同时提高电磁波分布均匀性的同时，增大电磁波的能量密度及分布范围。

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。现有技术为解决该问题，将辐射天线设置为至少覆盖加热室的一个内壁，来使食物均匀地被解冻。然而该方案不仅生产成本高，而且并不能解决电磁波在天线周缘处集中而导致天线局部发热甚至打火的问题。
综合考虑，在设计上需要一种生产成本低且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生产成本低且电磁波分布均匀的电磁波加热装置。
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，
所述辐射天线设置为向靠近待处理物的方向拱起，以使所述加热室内的电磁波分布更加均匀。
可选地，所述辐射天线包括：
中心部和边缘部，所述边缘部设置于所述中心部的远离待处理物的一侧 并平行于所述中心部延伸；以及
连接部，设置为连接所述中心部和所述边缘部。
可选地，所述连接部设置为自所述中心部的周缘至所述边缘部的内周缘渐扩延伸。
可选地，所述连接部包括：
第一圆弧段，设置为自所述中心部的周缘向靠近所述边缘部的方向延伸，并与所述中心部相切；
直线段，设置为与所述第一圆弧段相切；和
第二圆弧段，设置为连接所述直线段的外周缘与所述边缘部的内周缘，并与所述直线段和所述边缘部相切。
可选地，所述中心部、连接部和边缘部的几何中心均与所述加热室沿平行于所述中心部的假想平面截取的最大截面的中心重合。
可选地，所述中心部呈矩圆形；且
所述中心部的长度方向与所述截面的长度方向平行。
可选地，所述中心部的长度为所述截面的长度的0.386～0.522；和/或
所述中心部的宽度为所述截面的宽度的0.19～0.471；和/或
所述中心部的圆角半径为所述中心部的宽度的0.2～0.4；和/或
所述边缘部的外端缘长度为所述截面的长度的0.519～0.674；和/或
所述边缘部的外端缘宽度为所述截面的宽度的0.38～0.62；和/或
所述边缘部的外端缘的圆角半径为所述边缘部的外端缘宽度的0.2～0.4；和/或
所述第一圆弧段的半径大于等于所述中心部与所述边缘部在垂直于中心部的间距的1/3；
所述直线段与所述中心部的夹角为120°～160°；
所述第二圆弧段的半径大于等于所述中心部与所述边缘部在垂直于中心部的间距的1/6。
可选地，所述中心部水平延伸；且
所述中心部设置于所述筒体的0.285～0.5高度处；且
所述边缘部设置于所述筒体的0.19～0.334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电器室 和所述加热室；其中
所述辐射天线设置于所述电器室内且其中心部与所述天线罩固定连接。
可选地，所述中心部形成有多个卡接孔；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中心部卡接；其中
所述卡扣由垂直于所述中心部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中心部延伸的弹性部组成。
本发明创造性地将辐射天线设置为向靠近待处理物的方向拱起，可相对减少辐射天线的中心距离接收极的距离、增大辐射天线的周缘距离接收极的距离，进而消除了边缘效应对加热室内电磁波分布均匀性的影响，在解决生产成本的同时提高了电磁波分布均匀性的同时，增大了电磁波的能量密度及分布范围。
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5是图4中区域B的示意性放大视图；
图6是沿横向方向和竖直方向截取的加热装置的示意性截图；
图7是沿前后方向和竖直方向截取的加热装置的示意性截图；
图8是根据本发明一个实施例的辐射天线的测试图；
图9是基于图8测得的电磁波分布仿真图；
图10是根据本发明一个对比例的辐射天线的测试图；
图11是基于图10测得的电磁波分布仿真图。
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。
当取放口开设在筒体110的前壁时，辐射天线150可设置于筒体110的顶部、底部、横向两侧或后部。当取放口开设在筒体110的顶壁，辐射天线150可设置于筒体110的周侧或底部。优选地，辐射天线150设置于筒体110的底部，以避免因抽屉140内放置过高的待处理物而损坏天线，并可利用抽屉140隐藏天线。
下面以辐射天线150设置于筒体110的底部为例对本发明的技术方案进行详细阐述。
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。参见图4，辐射天线150可设置为向上拱起，以相对减少辐射天线150的中心距离筒体110的顶壁的距离、增大辐射天线150的周缘距离筒体110的顶壁的距离，进而消除边缘效应对加热室111内电磁波分布均匀性的影响，提高电磁波分布均匀性的同时，增大电磁波的能量密度及分布范围。
本领域技术人员均熟知地，边缘效应是指天线周缘处的磁场强度远高于 中心处的磁强度。
具体地，辐射天线150可包括中心部150a、边缘部150c和连接中心部150a和边缘部150c的连接部150b。中心部150a可沿水平方向延伸。边缘部150c可设置于中心部150a的下方，并平行于中心部150a延伸。连接部150b可设置为自中心部150a的周缘至边缘部150c的内周缘渐扩延伸，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，连接部150b可包括自中心部150a的周缘至边缘部150c的内周缘依次连接的第一圆弧段、直线段和第二圆弧段。其中第一圆弧段可设置为与中心部150a相切，直线段可设置为与第一圆弧段相切，第二圆弧段可设置为与直线段和边缘部150c相切，以避免在尖角处形成边缘效应，进一步提高加热室111内电磁波分布的均匀性。
在一些实施例中，中心部150a、连接部150b和边缘部150c的几何中心均与加热室111沿水平延伸的假想平面截取的面积最大的截面的中心重合，以使加热室111内的电磁波更均匀地分布。
在一些实施例中，加热室111可呈长方形。适应性地，中心部150a可呈矩圆形，且中心部150a的长度方向可与前述截面的长度方向平行，以使加热室111内的电磁波更均匀地分布。
在一些实施例中，中心部150a的长度w 1可为前述截面的长度W的0.386～0.522，例如0.386、0.45、或0.522等。中心部150a的宽度d 1可为前述截面的宽度D的0.19～0.471，例如0.19、0.2、0.375、0.471等。中心部150a的圆角半径可为中心部150a的宽度d 1的0.2～0.4，例如0.2、0.33、或0.4等。边缘部150c的外端缘长度w 2可为前述截面的长度W的0.519～0.674，例如0.519、0.6、或0.674。边缘部150c的外端缘宽度d 2可为前述截面的宽度D的0.38～0.62，例如0.38、0.5、或0.62等。边缘部150c的外端缘的圆角半径可为边缘部150c的外端缘宽度d 2的0.2～0.4，例如0.2、0.33、或0.4等。第一圆弧段的半径r 1可大于等于中心部150a与边缘部150c在竖直方向上的间距(h 1-h 2)的1/3，例如可为中心部150a与边缘部150c在竖直方向上的间距的1/3、2/5、或1/2等。直线段与中心部150a的夹角α可为120°～160°，例如120°、140°、或160°等。第二圆弧段的半径r 2可大于等于中心部150a与边缘部150c的间距(h 1-h 2)的1/6，例如可为中心部150a与边缘部150c在竖直方向上的间距的1/6、1/5、1/3、或1/2等。本发明通过对辐射天线150在水 平方向上的各个尺寸进行限定，可在节约生产成本的同时，在水平方向上使加热室111内的电磁波具有较大的分布面积。
中心部150a可设置于筒体110的0.285～0.5高度处(h 1/H)，例如0.285、0.292、0.33、0.4、或0.5等。边缘部150c可设置于筒体110的0.19～0.334高度处(h 2/H)，例如0.19、0.195、0.2、0.25、或0.334等。本发明通过对辐射天线150在竖直方向上的设置高度进行限定，可使加热室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。
为了进一步理解本发明，下面结合更具体的实施例对本发明的优选实施方案进行描述。
图8是根据本发明一个实施例的辐射天线的测试图。参见图8，其中辐射天线为本发明一个实施例的辐射天线，其参数为：w 1＝154mm，d 1＝86mm，w 2＝205mm，d 2＝115mm，r 1＝10mm，α＝130°，r 2＝5mm，h 1＝50mm，h 2＝34mm，中心部150a的圆角半径为28mm，边缘部150c的外端缘的圆角半径为38mm。
图10是根据本发明一个对比例的辐射天线的测试图。参见图8，其中辐射天线为平板式天线，且该天线呈矩圆形，其长度为205mm，宽度为115mm，圆角半径为38mm，天线距底壁的距离为50mm。
测试说明：将图8实施例的辐射天线和图10对比例的辐射天线分别置入W＝342mm，D＝230mm，H＝171mm的筒体内进行仿真实验。
图9是由图8测得的电磁波分布仿真图；图11是由图10测得的电磁波分布仿真图。其中，为明显比较出实施例与对比例的电磁波分布差异，图9仿真图和图11仿真图均被设定为当筒体内任一空间点的磁场强度大于一强度值(该强度值为图8实施例的天线中心处的磁场强度与图10对比例的天线中心处的磁场强度的差值)时，该空间点显示为有电磁波。
由图9和图11可以看出，本发明实施例的辐射天线150相比于对比例的平板式天线，无磁场集中隐患，电磁波分布均匀且分布范围较大。
表1电场强度测试表格a
测量点 X Y Z 电场强度
m1 15.500 66.000 401.830 2.782e+003
m2 15.500 66.000 457.700 3.059e+003
m3 110.500 66.000 401.830 3.181e+003
m4 15.500 66.000 347.700 2.829e+003
m5 -79.500 66.000 401.830 3.060e+003
表2电场强度测试表格b
测量点 X Y Z 电场强度
m1 15.600 66.000 401.830 1.206e+003
m2 15.500 66.000 457.700 1.813e+003
m3 110.500 66.000 401.830 1.896e+003
m4 15.500 66.000 347.500 1.446e+003
m5 -79.500 66.000 401.830 1.685e+003
表1是图9中的电场强度测试表格；表2是图11中的电场强度测试表格。由表1和表2可以看出，本发明实施例的辐射天线150相比于对比例的平板式天线在筒体的相同空间点处的电场强度更高，也就是说该空间点处的电磁波的能量密度更高，可以获得更高的加热效率。
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的中心部150a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5是图4中区域B的示意性放大视图。参见图5，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。
具体地，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。
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。
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。金属支架180可预先与带电路板和筒体110固定连接。
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，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，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；其特征在于，
    所述辐射天线设置为向靠近待处理物的方向拱起，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，其特征在于，所述辐射天线包括：
    中心部和边缘部，所述边缘部设置于所述中心部的远离待处理物的一侧并平行于所述中心部延伸；以及
    连接部，设置为连接所述中心部和所述边缘部。
  3. 根据权利要求2所述的加热装置，其特征在于，
    所述连接部设置为自所述中心部的周缘至所述边缘部的内周缘渐扩延伸。
  4. 根据权利要求3所述的加热装置，其特征在于，所述连接部包括：
    第一圆弧段，设置为自所述中心部的周缘向靠近所述边缘部的方向延伸，并与所述中心部相切；
    直线段，设置为与所述第一圆弧段相切；和
    第二圆弧段，设置为连接所述直线段的外周缘与所述边缘部的内周缘，并与所述直线段和所述边缘部相切。
  5. 根据权利要求4所述的加热装置，其特征在于，
    所述中心部、连接部和边缘部的几何中心均与所述加热室沿平行于所述中心部的假想平面截取的最大截面的中心重合。
  6. 根据权利要求5所述的加热装置，其特征在于，
    所述中心部呈矩圆形；且
    所述中心部的长度方向与所述截面的长度方向平行。
  7. 根据权利要求6所述的加热装置，其特征在于，
    所述中心部的长度为所述截面的长度的0.386～0.522；和/或
    所述中心部的宽度为所述截面的宽度的0.19～0.471；和/或
    所述中心部的圆角半径为所述中心部的宽度的0.2～0.4；和/或
    所述边缘部的外端缘长度为所述截面的长度的0.519～0.674；和/或
    所述边缘部的外端缘宽度为所述截面的宽度的0.38～0.62；和/或
    所述边缘部的外端缘的圆角半径为所述边缘部的外端缘宽度的0.2～0.4；和/或
    所述第一圆弧段的半径大于等于所述中心部与所述边缘部在垂直于中心部的间距的1/3；
    所述直线段与所述中心部的夹角为120°～160°；
    所述第二圆弧段的半径大于等于所述中心部与所述边缘部在垂直于中心部的间距的1/6。
  8. 根据权利要求2或7所述的加热装置，其特征在于，
    所述中心部水平延伸；且
    所述中心部设置于所述筒体的0.285～0.5高度处；且
    所述边缘部设置于所述筒体的0.19～0.334高度处。
  9. 根据权利要求2所述的加热装置，其特征在于，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电器室和所述加热室；其中
    所述辐射天线设置于所述电器室内且其中心部与所述天线罩固定连接。
  10. 根据权利要求9所述的加热装置，其特征在于，
    所述中心部形成有多个卡接孔；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中心部卡接；其中
    所述卡扣由垂直于所述中心部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中心部延伸的弹性部组成。
PCT/CN2020/070343 2019-01-04 2020-01-03 加热装置 WO2020140989A1 (zh)

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