Heating device

Abstract

The present invention provides a heating device. The heating device includes a cylinder, a door, an electromagnetic generating module and a radiation antenna. A heating chamber with a take-in and put-out port is defined in the cylinder, and the heating chamber is used to place an object to be processed. The door is arranged at the take-in and put-out port, and is used to open and close the take-in and put-out port. The electromagnetic generating module is configured to generate an electromagnetic wave signal. The radiation antenna is arranged in the cylinder and is electrically connected to the electromagnetic generating module to generate electromagnetic waves of corresponding frequencies according to the electromagnetic wave signal. The radiation antenna is arranged to arch in a direction close to the object to be processed, so as to eliminate the influence of the edge effect on the uniformity of the electromagnetic wave distribution in the heating chamber, and to increase the energy density and distribution range of the electromagnetic wave while improving the uniformity of the electromagnetic wave distribution while solving the production cost.

Description

Technical Field

[0001] The invention relates to kitchen utensils, in particular to an electromagnetic wave heating device. Background Art

[0002] During the freezing process of food, the quality of the food is maintained, but the frozen food needs to be thawed before processing or eating. In order to facilitate users to freeze and thaw food, the prior art generally thaws food by an electromagnetic wave device.

[0003] The temperature uniformity of thawed food is closely related to the uniformity of the distribution of electromagnetic waves in the heating chamber. When there is a gap between the radiating antenna and the inner wall of the heating chamber located in its circumferential direction, the electromagnetic waves in the heating chamber will be concentrated at the periphery of the radiating antenna due to the edge effect of the radiating antenna. In order to solve this problem, the prior art sets the radiating antenna to cover at least one inner wall of the heating chamber so that the food can be thawed evenly. However, 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, causing local heating or even ignition of the antenna.

[0004] Taking all factors into consideration, a design of an electromagnetic wave heating device with low production cost and uniform electromagnetic wave distribution is required. Summary of the invention

[0005] An object of the present invention is to provide an electromagnetic wave heating device with low production cost and uniform electromagnetic wave distribution.

[0006] In particular, the present invention provides a heating device, comprising:

[0007] A cylinder body, in which a heating chamber with a take-in and put-out opening is defined, and the heating chamber is used to place the object to be processed;

[0008] A door body, arranged at the access opening, used for opening and closing the access opening;

[0009] An electromagnetic generating module configured to generate an electromagnetic wave signal; and

[0010] A radiation antenna is disposed in the cylinder and electrically connected to the electromagnetic generating module to generate electromagnetic waves of corresponding frequencies according to the electromagnetic wave signal; characterized in that:

[0011] The radiation antenna is configured to be arched toward a direction close to the object to be processed, so that the electromagnetic waves in the heating chamber are distributed more evenly.

[0012] Optionally, the radiating antenna includes:

[0013] a central portion and an edge portion, wherein the edge portion is disposed on a side of the central portion away from the object to be processed and extends parallel to the central portion; and

[0014] The connecting portion is configured to connect the central portion and the edge portion.

[0015] Optionally, the connecting portion is configured to gradually extend from the periphery of the central portion to the inner periphery of the edge portion.

[0016] Optionally, the connecting portion includes:

[0017] A first arc segment is arranged to extend from the periphery of the central portion toward the edge portion and is tangent to the central portion;

[0018] a straight line segment, arranged to be tangent to the first arc segment; and

[0019] The second arc segment is configured to connect the outer periphery of the straight line segment and the inner periphery of the edge portion, and is tangent to the straight line segment and the edge portion.

[0020] Optionally, 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.

[0021] Optionally, the central portion is in a rectangular shape; and

[0022] The length direction of the central portion is parallel to the length direction of the cross section.

[0023] Optionally, the length of the central portion is 0.386 to 0.522 of the length of the cross section; and / or

[0024] The width of the central portion is 0.19 to 0.471 of the width of the cross section; and / or

[0025] The fillet radius of the central portion is 0.2 to 0.4 of the width of the central portion; and / or

[0026] The outer edge length of the edge portion is 0.519 to 0.674 of the length of the cross section; and / or

[0027] The outer edge width of the edge portion is 0.38 to 0.62 of the width of the cross section; and / or

[0028] The fillet radius of the outer edge of the edge portion is 0.2 to 0.4 of the width of the outer edge of the edge portion; and / or

[0029] The radius of the first 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;

[0030] The angle between the straight line segment and the central portion is 120° to 160°;

[0031] 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.

[0032] Optionally, the central portion extends horizontally; and

[0033] The central portion is disposed at a height of 0.285 to 0.5 of the cylinder; and

[0034] The edge portion is arranged at a height of 0.19 to 0.334 of the cylinder.

[0035] Optionally, the heating device further comprises:

[0036] The antenna cover is made of insulating material and is configured to separate the inner space of the cylinder into an electrical room and the heating room; wherein

[0037] The radiating antenna is disposed in the electrical room and a central portion thereof is fixedly connected to the antenna cover.

[0038] Optionally, the central portion is formed with a plurality of snap-in holes; and

[0039] The antenna cover is correspondingly formed with a plurality of buckles, and the plurality of buckles are arranged to pass through the plurality of buckle holes and buckle with the central portion respectively; wherein

[0040] The buckle is composed of a fixing portion which is perpendicular to the central portion and hollow in the middle, and an elastic portion which extends from the inner end edge of the fixing portion and is inclined toward the central portion.

[0041] The present invention creatively arranges the radiating antenna to be arched in the direction close to the object to be processed, which can relatively reduce the distance from the center of the radiating antenna to the receiving electrode and increase the distance from the periphery of the radiating antenna to the receiving electrode, thereby eliminating the influence of the edge effect on the uniformity of the electromagnetic wave distribution in the heating chamber, while solving the production cost and improving the uniformity of the electromagnetic wave distribution, and increasing the energy density and distribution range of the electromagnetic waves.

[0042] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0044] Figure 1 is a schematic structural diagram of a heating device according to an embodiment of the present invention;

[0045] Figure 2 yes Figure 1 A schematic cross-sectional view of the heating device shown, wherein the electromagnetic generating module and the power supply module are removed;

[0046] Figure 3 yes Figure 2 Schematic enlarged view of region A;

[0047] Figure 4 is a schematic structural diagram of an electrical room according to an embodiment of the present invention;

[0048] Figure 5 yes Figure 4 Schematic enlarged view of region B;

[0049] Figure 6 is a schematic cross-sectional view of a heating device taken in a transverse direction and a vertical direction;

[0050] Figure 7 is a schematic cross-sectional view of the heating device taken along the front-to-back direction and the vertical direction;

[0051] Figure 8 is a test diagram of a radiating antenna according to an embodiment of the present invention;

[0052] Fig. 9 Is Figure 8 Simulation diagram of measured electromagnetic wave distribution;

[0053] Fig.10 yes Fig. 9 Magnetic field strength test table in;

[0054] Fig.11 is a test diagram of a radiating antenna according to a comparative example of the present invention;

[0055] Fig.12 Is Fig.11 Simulation diagram of measured electromagnetic wave distribution;

[0056] Fig.13 yes Fig.12 Magnetic field strength test table in. DETAILED DESCRIPTION

[0057] Figure 1 is a schematic structural diagram of a heating device 100 according to an embodiment of the present invention; Figure 2 yes Figure 1 The schematic cross-sectional view of the heating device 100 is shown, wherein the electromagnetic generating module 161 and the power supply module 162 are removed. Figure 1 and Figure 2 The heating device 100 may include a cylinder 110 , a door body 120 , an electromagnetic generating module 161 , a power supply module 162 , and a radiation antenna 150 .

[0058] The cylinder 110 defines a heating chamber 111 with a take-in and put-out opening, and the heating chamber 111 is used to place the object to be processed. The take-in and put-out opening can be opened on the front wall or the top wall of the heating chamber 111 to take in and put the object to be processed.

[0059] The door body 120 can be installed with the cylinder body 110 by appropriate methods, such as slide rail connection, hinge connection, etc., for opening and closing the access opening. In the illustrated embodiment, the heating device 100 also includes a drawer 140 for carrying the objects to be processed, and the front end plate of the drawer 140 is arranged to be fixedly connected to the door body 120, and the two lateral side plates are movably connected to the cylinder body 110 through slide rails.

[0060] The power supply module 162 can be configured to be electrically connected to the electromagnetic generating module 161 to provide electrical energy to the electromagnetic generating module 161, thereby causing the electromagnetic generating module 161 to generate an electromagnetic wave signal. The radiation antenna 150 can be disposed in the cylinder 110 and electrically connected to the electromagnetic generating module 161 to generate electromagnetic waves of a corresponding frequency according to the electromagnetic wave signal to heat the object to be processed in the cylinder 110.

[0061] When the access opening is opened on the front wall of the cylinder 110, the radiating antenna 150 can be arranged on the top, bottom, lateral sides or rear of the cylinder 110. When the access opening is opened on the top wall of the cylinder 110, the radiating antenna 150 can be arranged on the circumference or bottom of the cylinder 110. Preferably, the radiating antenna 150 is arranged at the bottom of the cylinder 110 to avoid damage to the antenna due to placing too high objects to be processed in the drawer 140, and the drawer 140 can be used to hide the antenna.

[0062] The technical solution of the present invention is described in detail below by taking the case where the radiation antenna 150 is disposed at the bottom of the cylinder 110 as an example.

[0063] In some embodiments, the cylinder 110 may be made of metal to serve as a receiving pole to receive electromagnetic waves generated by the radiating antenna 150. In other embodiments, a receiving pole plate may be provided on the top wall of the cylinder 110 to receive electromagnetic waves generated by the radiating antenna 150.

[0064] Figure 4 FIG. 1 is a schematic structural diagram of an electrical room 112 according to an embodiment of the present invention. Figure 4 The radiation antenna 150 can be set to be arched upward to relatively reduce the distance between the center of the radiation antenna 150 and the top wall of the cylinder 110 and increase the distance between the periphery of the radiation antenna 150 and the top wall of the cylinder 110, thereby eliminating the influence of the edge effect on the uniformity of electromagnetic wave distribution in the heating chamber 111, improving the uniformity of electromagnetic wave distribution, and increasing the energy density and distribution range of the electromagnetic waves.

[0065] It is well known to those skilled in the art that 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.

[0066] Specifically, 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 a horizontal direction. The edge portion 150c may be disposed below the central portion 150a and extend parallel to the central portion 150a. The connecting portion 150b may be disposed to gradually expand and extend from the periphery of the central portion 150a to the inner periphery of the edge portion 150c, so as to further improve the uniformity of the distribution of electromagnetic waves in the heating chamber 111.

[0067] In some embodiments, the connecting portion 150b may include a first arc segment, a straight line segment, and a second arc segment sequentially connected from the periphery of the central portion 150a to the inner periphery of the edge portion 150c. The first arc segment may be set to be tangent to the central portion 150a, the straight line segment may be set to be tangent to the first arc segment, and the second arc segment may be set to be tangent to the straight line segment and the edge portion 150c, so as to avoid the formation of edge effects at sharp corners and further improve the uniformity of electromagnetic wave distribution in the heating chamber 111.

[0068] In some embodiments, the geometric centers of the central portion 150a, the connecting portion 150b and the edge portion 150c coincide with the center of the largest cross section of the heating chamber 111 taken along a horizontally extending imaginary plane, so that the electromagnetic waves in the heating chamber 111 are more evenly distributed.

[0069] In some embodiments, the heating chamber 111 may be rectangular. Adaptively, the central portion 150a may be rectangular, and the length direction of the central portion 150a may be parallel to the length direction of the aforementioned cross section, so that the electromagnetic waves in the heating chamber 111 are more evenly distributed.

[0070] In some embodiments, the length w1 of the center 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 d1 of the center portion 150a may be 0.19 to 0.471 of the width D of the aforementioned cross section, such as 0.19, 0.2, 0.375, 0.471. The fillet radius of the center portion 150a may be 0.2 to 0.4 of the width d1 of the center portion 150a, such as 0.2, 0.33, or 0.4. The outer edge length w2 of the edge portion 150c may be 0.519 to 0.674 of the length W of the aforementioned cross section, such as 0.519, 0.6, or 0.674. The outer edge width d2 of the edge portion 150c may be 0.38 to 0.62 of the width D of the aforementioned cross section, such as 0.38, 0.5, or 0.62. The fillet radius of the outer edge of the edge portion 150c may be 0.2 to 0.4 of the outer edge width d2 of the edge portion 150c, such as 0.2, 0.33, or 0.4. The radius r1 of the first arc segment may be greater than or equal to 1 / 3 of the distance (h1-h2) between the center portion 150a and the edge portion 150c in the vertical direction, such as 1 / 3, 2 / 5, or 1 / 2 of the distance between the center portion 150a and the edge portion 150c in the vertical direction. The angle α between the straight segment and the center portion 150a may be 120° to 160°, such as 120°, 140°, or 160°. The radius r2 of the second arc segment may be greater than or equal to 1 / 6 of the distance (h1-h2) between the center portion 150a and the edge portion 150c, for example, 1 / 6, 1 / 5, 1 / 3, or 1 / 2 of the distance between the center portion 150a and the edge portion 150c in the vertical direction. The present invention limits the dimensions of the radiation antenna 150 in the horizontal direction, thereby saving production costs and making the electromagnetic waves in the heating chamber 111 have a larger distribution area in the horizontal direction.

[0071] The center portion 150a may be disposed at a height of 0.285 to 0.5 of the cylinder 110 (h1 / H), such as 0.285, 0.292, 0.33, 0.4, or 0.5. The edge portion 150c may be disposed at a height of 0.19 to 0.334 of the cylinder 110 (h2 / H), such as 0.19, 0.195, 0.2, 0.25, or 0.334. The present invention limits the vertical height of the radiation antenna 150, so that the volume of the heating chamber 111 is larger and the electromagnetic waves in the heating chamber 111 have a higher energy density.

[0072] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with more specific examples.

[0073] Figure 8 is a test diagram of a radiating antenna according to an embodiment of the present invention. Figure 8 , wherein the radiating antenna is a radiating antenna of an embodiment of the present invention, and its parameters are: w1=154mm, d1=86mm, w2=205mm, d2=115mm, r1=10mm, α=130°, r2=5mm, h1=50mm, h2=34mm, the fillet radius of the center portion 150a is 28mm, and the fillet radius of the outer edge of the edge portion 150c is 38mm.

[0074] Fig.11 is a test diagram of a radiation antenna according to a comparative example of the present invention. Figure 8 The radiating antenna is a flat-plate antenna in the shape of a rectangle with a length of 205 mm, a width of 115 mm, a fillet radius of 38 mm, and a distance of 50 mm from the bottom wall.

[0075] Test Description: Figure 8 Radiating antenna of an embodiment and Fig.11 The radiating antennas of the comparative example were placed in cylinders with W=342 mm, D=230 mm, and H=171 mm for simulation experiments.

[0076] Fig. 9 Is Figure 8 Simulation diagram of measured electromagnetic wave distribution; Fig.12 Is Fig.11 The measured electromagnetic wave distribution simulation diagram. In order to clearly compare the difference in electromagnetic wave distribution between the embodiment and the comparative example, Fig. 9 Simulation diagram and Fig.12 The simulation diagrams are all set to be when the magnetic field strength at any point in the cylinder is greater than a certain strength value (the strength value is Figure 8 The magnetic field strength at the center of the antenna of the embodiment is Fig.11 When the difference in magnetic field strength at the center of the antenna in the comparative example is 0.0447 W / m, the spatial point is displayed as having electromagnetic waves.

[0077] Depend on Fig. 9 and Fig.12 It can be seen that the radiating antenna 150 of the embodiment of the present invention has no hidden danger of magnetic field concentration compared with the flat-plate antenna of the comparative example, and the electromagnetic waves are evenly distributed over a larger distribution range.

[0078] Fig.10 yes Fig. 9 Magnetic field strength test table in; Fig.13 yes Fig.12 The magnetic field strength test table in . Fig.10 and Fig.13 It can be seen that the radiating antenna 150 of the embodiment of the present invention has a higher magnetic field intensity at the same spatial point of the cylinder than the flat-plate antenna of the comparative example, that is, the energy density of the electromagnetic wave at this spatial point is higher, and a higher heating efficiency can be obtained.

[0079] See also Figure 2 and Figure 4 The heating device 100 may further include an antenna cover 130 to separate the inner space of the cylinder 110 into a heating chamber 111 and an electrical chamber 112. The object to be processed and the radiation antenna 150 may be respectively arranged in the heating chamber 111 and the electrical chamber 112 to separate the object to be processed and the radiation antenna 150 to prevent the radiation antenna 150 from being dirty or accidentally damaged.

[0080] In some embodiments, 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 the electromagnetic waves at the radome 130, thereby increasing the heating rate of the object to be processed. The aforementioned non-transparent material is a translucent or opaque material. The non-transparent material may be a PP material, a PC material, or an ABS material, etc.

[0081] The antenna cover 130 can also be used to fix the radiation antenna 150, so as to simplify the assembly process of the heating device 100 and facilitate the positioning and installation of the radiation antenna 150. Specifically, the antenna cover 130 may include a partition 131 that separates the heating chamber 111 and the electrical chamber 112, and a skirt 132 that is fixedly connected to the inner wall of the cylinder 110. The central portion 150a of the radiation antenna 150 may be arranged to be fixedly connected to the partition 131.

[0082] In some embodiments, the radiating antenna 150 may be configured to be fixedly connected to the radome 130 . Figure 5 yes Figure 4 Schematic enlarged view of region B in FIG. Figure 5 The radiating antenna 150 may be formed with a plurality of snap-fit ​​holes 151 , and the antenna cover 130 may be correspondingly formed with a plurality of snap-fit ​​buckles 133 , and the plurality of snap-fit ​​buckles 133 are configured to pass through the plurality of snap-fit ​​holes 151 and snap-fit ​​with the radiating antenna 150 , respectively.

[0083] Specifically, the buckle 133 may be composed of a fixing portion which is perpendicular to the radiation antenna 150 and hollow in the middle, and an elastic portion which extends from the inner edge of the fixing portion and is inclined toward the antenna.

[0084] The radome 130 may further include a plurality of reinforcing ribs, which are configured to connect the partition 131 and the skirt 132 to improve the structural strength of the radome 130 .

[0085] Figure 3 yes Figure 2 Schematic enlarged view of area A in FIG. Figures 1 to 3The heating device 100 may further include a signal processing and measurement and control circuit 170. Specifically, the signal processing and measurement and control circuit 170 may include a detection unit 171, a control unit 172, and a matching unit 173.

[0086] The detection unit 171 may be connected in series between the electromagnetic generating module 161 and the radiation antenna 150 , and may be configured to detect specific parameters of incident wave signals and reflected wave signals passing therethrough in real time.

[0087] The control unit 172 may be configured to obtain 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. In the present invention, 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.

[0088] 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 a preset absorption threshold, and when the electromagnetic wave absorption rate is less than the preset absorption threshold, send an adjustment instruction to the matching unit 173. The preset absorption threshold may be 60-80%, for example 60%, 70%, or 80%.

[0089] The matching unit 173 can be connected in series between the electromagnetic generating module 161 and the radiation antenna 150, and is configured to adjust the load impedance of the electromagnetic generating module 161 according to the adjustment instructions of the control unit 172, so as to improve the matching degree between the output impedance and the load impedance of the electromagnetic generating module 161, so as to place foods with different fixed properties (type, weight, volume, etc.) in the heating chamber 111, or to have more electromagnetic wave energy radiated in the heating chamber 111 during the temperature change process of the foods, thereby improving the heating rate.

[0090] In some embodiments, the heating device 100 can be used for thawing. The control unit 172 can also be configured to calculate the imaginary change rate of the dielectric constant of the object to be processed according to the power of the incident wave and the reflected wave, and compare the imaginary change rate with a preset change threshold, and send a stop instruction to the electromagnetic generating module 161 when the imaginary change rate of the dielectric constant of the object to be processed is greater than or equal to the preset change threshold, so that the electromagnetic generating module 161 stops working and the thawing program is terminated.

[0091] The preset change threshold can be obtained by testing the imaginary part change rate of the dielectric constant of foods with different fixed properties at -3 to 0°C, so that the food has better shear strength. For example, when the object to be processed is raw beef, the preset change threshold can be set to 2.

[0092] The control unit 172 can also be configured to receive user instructions and control the electromagnetic generating 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 electrical energy from the power supply module 162 and remain in a standby state.

[0093] In some embodiments, the signal processing and measurement and control circuit 170 may be integrated into a circuit board and horizontally disposed in the electrical chamber 112 to facilitate electrical connection between the radiating antenna 150 and the matching module.

[0094] The antenna cover 130 and the barrel 110 may be provided with heat dissipation holes 190 at positions corresponding to the matching unit 173, so that the heat generated by the matching unit 173 when working can be discharged through the heat dissipation holes 190. In some embodiments, the signal processing and measurement and control circuit 170 may be disposed on the rear side of the radiating antenna 150. The heat dissipation holes 190 may be provided on the rear walls of the antenna cover 130 and the barrel 110.

[0095] In some embodiments, the metal cylinder 110 may be grounded to conduct the electric charge thereon and improve the safety of the heating device 100 .

[0096] 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 conduct the charge on the circuit board through the barrel 110. In some embodiments, the metal bracket 180 may be composed of two parts perpendicular to each other. The metal bracket 180 may be fixedly connected with the circuit board and the barrel 110 in advance.

[0097] In some embodiments, the electromagnetic generating module 161 and the power supply module 162 may be disposed outside the barrel 110. A portion of the metal bracket 180 may be disposed at the rear of the circuit board and extend vertically in the lateral direction, and may be provided with two wiring ports, so that the wiring terminal of the detection unit 171 (or the matching unit 173) extends from one wiring port to be electrically connected to the electromagnetic generating module 161, and the wiring terminal of the control unit 172 extends from the other wiring port to be electrically connected to the electromagnetic generating module 161 and the power supply module 162.

[0098] In some embodiments, the cylinder 110 and the door 120 may be respectively provided with electromagnetic shielding features, so that the door 120 is conductively connected to the cylinder 110 when in a closed state to prevent electromagnetic leakage.

[0099] In some embodiments, the heating device 100 can be disposed in a storage compartment of a refrigerator to facilitate users in thawing food.

[0100] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A heating device, comprising: A cylinder body, in which a heating chamber with a take-in and put-out opening is defined, and the heating chamber is used to place the object to be processed; A door body, arranged at the access opening, used for opening and closing the access opening; An electromagnetic generating module, configured to generate an electromagnetic wave signal; and A radiation antenna is disposed in the cylinder and electrically connected to the electromagnetic generating module to generate electromagnetic waves of corresponding frequencies according to the electromagnetic wave signal; characterized in that: The radiation antenna is configured to arch toward the direction close to the object to be processed so that the electromagnetic waves in the heating chamber are more evenly distributed. The radiation antenna includes: a central portion and an edge portion, wherein the edge portion is disposed on a side of the central portion away from the object to be processed and extends parallel to the central portion; and A connecting portion, configured to connect the central portion and the edge portion; wherein the connecting portion comprises: A first arc segment is arranged to extend from the periphery of the central portion toward the edge portion and is tangent to the central portion; a straight line segment, arranged to be tangent to the first arc segment; and The second arc segment is configured to connect the outer periphery of the straight line segment and the inner periphery of the edge portion, and is tangent to the straight line segment and the edge portion.

2. The heating device according to claim 1, characterized in that 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.

3. The heating device according to claim 2, characterized in that: The central portion is rectangular; and The length direction of the central portion is parallel to the length direction of the cross section.

4. The heating device according to claim 3, characterized in that: 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; and / or The fillet radius of the central portion is 0.2 to 0.4 of the width of the central portion; and / or The outer edge length of the edge portion is 0.519 to 0.674 of the length of the cross section; and / or The outer edge width 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 edge of the edge portion is 0.2 to 0.4 of the width of the outer edge of the edge portion; and / or The radius of the first 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 portion is 120° to 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.

5. The heating device according to claim 1 or 4, characterized in that: The central portion extends horizontally.

6. The heating device according to claim 5, characterized in that: The connecting portion is configured to gradually extend from the periphery of the central portion to the inner periphery of the edge portion.

7. The heating device according to claim 5, characterized in that: The central portion is disposed at a height of 0.285 to 0.5 of the cylinder; and The edge portion is arranged at a height of 0.19 to 0.334 of the cylinder.

8. The heating device according to claim 1, characterized in that Also includes: A radome, made of insulating material, configured to separate the inner space of the cylinder into an electrical room and the heating room; in The radiating antenna is disposed in the electrical room and a central portion thereof is fixedly connected to the antenna cover.

9. The heating device according to claim 8, characterized in that: The central portion is formed with a plurality of snap-in holes; and The antenna cover is correspondingly formed with a plurality of buckles, and the plurality of buckles are arranged to pass through the plurality of buckle holes and buckle with the central portion respectively; wherein The buckle is composed of a fixing portion which is perpendicular to the central portion and hollow in the middle, and an elastic portion which extends from the inner end edge of the fixing portion and is inclined toward the central portion.

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