Magnetron and microwave heating device

Abstract

A magnetron and microwave heating device, wherein the magnetron includes a tube core (21), a first tube shell (21a), a second tube shell (21b), an output ceramic (22), an antenna cap (23), and an antenna (24), wherein the first tube shell (21a), the tube core (21), the second tube shell (21b), the output ceramic (22), and the antenna cap (23) are connected in sequence, and the antenna (24) enters the tube core (21), and then enters the antenna cap (23) sequentially through the second tube shell (21b) and the output ceramic (22), and a height H1 of the second tube shell (21b) relative to the tube core (21) is 14 mm or less, and a ratio H1 / S of the height H1 of the tube core (21) to a cross-sectional area S of the antenna (24) is within a range of 0.4 to 3.3.

Description

Technical Field

[0001] This application relates to the technical field of heating devices, and particularly to magnetrons and microwave heating devices including such magnetrons.

Background Art

[0002] A magnetron is a vacuum electron tube that generates microwaves. Due to its characteristics of high oscillation efficiency and large microwave output, it is widely used as a microwave generation source in microwave application devices such as household microwave ovens and industrial microwave heating devices. As a relatively mature microwave generation source, its structure and size are severely restricted. Therefore, in a device that generates microwaves using a magnetron, the volume of the magnetron is large, which will have an adverse impact on the volume of the device.

Summary of the Invention

Problems to be Solved by the Invention

[0003] One object of this application is to propose a magnetron that realizes miniaturization of the magnetron by redesigning the size of the magnetron, and at the same time reduces the impact on the output efficiency of the magnetron while miniaturizing the magnetron.

[0004] Another object of this application is to propose a microwave heating device including the above magnetron.

Means for Solving the Problems

[0005] According to the embodiment of the present invention, the magnetron includes a tube core, a first tube shell, a second tube shell, an output ceramic, an antenna cap, and an antenna, wherein the first tube shell, the tube core, the second tube shell, the output ceramic, and the antenna cap are sequentially connected, the antenna enters the tube core and sequentially enters the antenna cap 23 through the second tube shell and the output ceramic 22, the height H1 of the second tube shell relative to the tube core is 14 millimeters or less, and the ratio H1 / S of the height H1 of the tube core to the cross-sectional area S of the antenna is in the range of 0.4 to 3.3.

[0006] According to the magnetron of the embodiment of the present invention, a miniaturized magnetron design can be achieved by reducing the size of the tube core, and the output efficiency of the magnetron can be guaranteed and energy loss reduced by setting a ratio between the height of the tube core and the height of the output ceramic.

[0007] Furthermore, the magnetron of the above embodiment of this application can have the following additional technical features.

[0008] Selectively, the ratio H1 / S of the height H1 of the tube core to the cross-sectional area S of the antenna is within the range of 1.5 to 1.7.

[0009] Selectively, the height of the first tube shell relative to the tube center is less than or equal to the height of the second tube shell relative to the tube center.

[0010] Selectively, both the first tube shell and the second tube shell include a tube body and a plate body, the plate body covering the end of the tube core, and the plate body is provided with projections for supporting a magnetic part that is fitted into the tube body such that there is a gap between the magnetic part and the plate body.

[0011] Optionally, the magnetron further includes a housing and a heat dissipation component, the tube core is located inside the housing, and the heat dissipation component is connected between the tube core and the housing.

[0012] Selectively, the heat dissipation component includes a connector, a first support, and a second support, the connector and the tube core being connected, the first support extending inclined to connect to the connector and to the housing, the second support extending inclined to connect to the connector and to the housing, and the first and second supports extending inclined in opposite directions.

[0013] Selectively, the connecting portion is provided with a first fold, the first fold being in close contact with the outer surface of the tube core, and both the first and second branches are provided with a second fold, the second fold being in close contact with the inner surface of the housing.

[0014] The antenna may be configured to be elongated in shape, with a circular, elliptical, or rectangular cross-section.

[0015] According to the microwave heating apparatus of the embodiment of the present application, the apparatus includes an inner pot and a magnetron, the inner pot has a cooking chamber, a microwave passage is provided in the wall of the inner pot, the magnetron is provided on the outside of the inner pot, the magnetron is suitable for supplying microwaves to the inner pot via the microwave passage, and the magnetron is the magnetron described above.

[0016] The microwave passage is optionally configured in a trumpet shape, with its cross-sectional area gradually increasing in the direction toward the cooking chamber.

[0017] The output ceramic and the antenna cap are selectively positioned to enter the microwave passage. [Brief explanation of the drawing]

[0018] [Figure 1] This is a schematic diagram of a magnetron according to one embodiment of the present invention. [Figure 2] This is a schematic diagram of a magnetron according to one embodiment of the present invention. [Figure 3] This is a localized schematic diagram of the region enclosed by circle A in Figure 2. [Figure 4] This is a schematic diagram of a microwave heating apparatus according to one embodiment of the present invention. [Figure 5] This is a schematic diagram of the H1 / S output efficiency of a magnetron according to one embodiment of the present invention. [Modes for carrying out the invention]

[0019] A magnetron is a vacuum electron tube that generates microwaves. Due to its high vibration efficiency and large microwave output, it is widely used as a microwave source in microwave-applied devices such as household microwave ovens and industrial microwave heating equipment. As the primary energy source in microwave heating devices, the magnetron significantly impacts the device's performance. As shown in Figure 4, the magnetron is installed in the electrical chamber of the microwave oven, occupying a large space. This is a bottleneck in miniaturizing microwave heating devices, severely limiting progress in miniaturization and increasing their volume. To achieve further miniaturization, the height of the magnetron needs to be reduced. However, miniaturizing the magnetron can easily affect its output efficiency, potentially leading to energy waste, increased heat generation, and ultimately impacting its performance. Therefore, with the aim of overcoming the shortcomings of the above-mentioned prior art, this application provides a magnetron with a miniaturized energy output structure, and by redesigning the height of the output ceramic, the output height of the magnetron is reduced while simultaneously increasing the energy output efficiency to more than 70%, thereby ensuring high-efficiency energy output, and achieving miniaturization of the magnetron's output structure. This application provides a magnetron that can be miniaturized, and at the same time, the impact on the magnetron's output efficiency can be reduced or avoided.

[0020] The following will describe the embodiments of the present application in detail. The exemplification of the embodiments is shown in the drawings, where throughout the text, the same or similar reference numerals indicate the same or similar elements, or elements having the same or similar functions. The embodiments described with reference to the following drawings are exemplary and are intended to be used to explain the present application and should not be construed as limiting the present application.

[0021] As shown in FIG. 1, according to the magnetron 20 of the embodiment of the present application, it includes a die 21, a first tube shell 21a, a second tube shell 21b, an output ceramic 22, an antenna cap 23, and an antenna 24, and the first tube shell 21a, the die 21, the second tube shell 21b, the output ceramic 22, and the antenna cap are sequentially connected. The antenna 24 penetrates into the die 21 and sequentially passes through the second tube shell 21b and the output ceramic 22 and enters the antenna cap 23. The height H1 of the die 21 with respect to the die 21 in the second tube shell 21b is 14 mm or less, and the ratio H1 / S of the height H1 of the die 21 to the cross-sectional area S of the antenna 24 is within the range of 0.4 to 3.3.

[0022] According to the magnetron 20 of the embodiment of the present application, by reducing the size of the die 21, the miniaturized design of the magnetron 20 is realized, and by providing the ratio of the height of the die 21 to the cross-sectional area S of the antenna 24, the output efficiency of the magnetron 20 can be guaranteed and the energy loss can be reduced.

[0023] Here, the die 21, the second tube shell 21b, the output ceramic 22, and the antenna cap 23 can be sequentially arranged along the axial direction of the die 21. The antenna 24 penetrates through the output ceramic 22 along the axis of the output ceramic 22 and enters into the antenna cap 23 along the axis of the antenna cap 23.

[0024] As can be seen from FIG. 4, in the microwave heating apparatus 100, in order to achieve effective conduction with respect to microwaves, the size of the microwave passage 102 can hardly be adjusted, and the antenna cap 23 or the antenna cap 23 and the output ceramic 22 enter the microwave passage 102, whereby the space occupied by the magnetron 20 can be reduced. The height size H1 of the die 21 has a decisive influence on the size of the space occupied by the magnetron 20. Thus, the present application mainly starts from the height size of the die 21, solves the problem that the space occupied by the magnetron 20 is large, and by providing the height size H1 of the die 21 to be 14 millimeters or less, the space occupied by the magnetron 20 can be effectively reduced, thereby improving the space utilization rate.

[0025] At the same time, due to the reduction of the height size H1 of the die 21, the energy output system structure of the magnetron 20 will change greatly. Since the antenna 24 has difficulty in sending energy to the output ceramic 22, the energy output efficiency is greatly reduced, which seriously affects the output efficiency of the magnetron 20.

[0026] In order to solve the influence of the reduction of the height size H1 of the die 21 on the output efficiency of the magnetron 20, in the present application, the cross-sectional area of the output antenna 24 and the height of the first tube shell 21a are reinstalled. As can be seen from experiments, the ratio H1 / S of the height H1 of the die 21 to the cross-sectional area S of the antenna 24 and the output efficiency of the magnetron 20 exhibit a non-linear change trend. By combining Table 1 and FIG. 5, it can be seen that when the ratio H1 / S is within the range of 0.4 to 3.3, the output efficiency of the magnetron 20 can be maintained at 70% or more.

[0027]

Table 1

[0028] Therefore, in this application, the height H1 of the tube core 21 is set to 14 millimeters or less, and the ratio H1 / S of the height H1 of the tube core 21 to the cross-sectional area S of the antenna 24 is set to between 0.4 and 3.3, which not only guarantees miniaturization of the magnetron 20 but also effectively guarantees the output efficiency of the magnetron 20, avoiding energy waste, being energy-saving and environmentally friendly, and similarly avoiding excessive heat generation from the magnetron 20 that affects its normal operation, thereby improving the operational stability of the miniaturized magnetron 20.

[0029] As can be seen from Table 1 above, when the height H1 of the tube core 21 is 14 millimeters or less, the ratio H1 / S and the output efficiency of the magnetron 20 show a non-linear trend, and when H1 / S is between 1.5 and 1.7, it can be guaranteed that the magnetron 20 has high output efficiency. Therefore, in some embodiments of this application, the ratio H1 / S of the height H1 of the tube core 21 to the cross-sectional area S of the antenna 24 is in the range of 1.3 to 1.7. This makes it possible to miniaturize the magnetron 20 while simultaneously improving its output efficiency.

[0030] Furthermore, the ratio H1 / S between the height H1 of the tube core 21 and the cross-sectional area S of the antenna 24 can be set within the range of 1.4 to 1.6.

[0031] The unit of the height H1 of the tube core 21 may be millimeters, and the cross-sectional area S of the corresponding antenna 24 may be square millimeters, where the unit of the ratio H1 / S may be 1 / mm. Similarly, the unit of the height H1 of the tube core 21 may be meters, and the cross-sectional area S of the corresponding antenna 24 may be square meters, where the unit of the ratio H1 / S may be 1 / m.

[0032] In some embodiments of the present invention, the height of the first tube shell 21a can be made smaller than the height of the second tube shell 21b, thereby further reducing the size of the magnetron 20. Alternatively, the height of the first tube shell 21a can be set to be the same as the height of the second tube shell 21b. Both the height of the first tube shell 21a and the height of the second tube shell 21b are heights relative to the tube core 21.

[0033] As shown in Figure 3, in some embodiments of the present invention, both the first tube shell 21a and the second tube shell 21b include a tube body portion 211 and a plate body portion 212, the plate body portion 212 covering the end of the tube core 21, and the plate body portion 212 is provided with a projection 213 for supporting the magnetic part that is fitted to the tube body portion 211 such that there is a gap between the magnetic part and the plate body portion 212. The supporting action of the projection 213 makes it possible to create a gap between the magnetic part 27 and the plate body portion 212, so that airflow can pass through the gap between the magnetic part 27 and the plate body portion 212, and by carrying heat through the airflow, the rate of heat conduction between the magnetic part 27 and the end cap is reduced, and at the same time the heat dissipation efficiency of the magnetic part 27 is also improved, and the rate of temperature rise and temperature of the magnetic part 27 are controlled more effectively.

[0034] Here, the main body of the tube 211 may include two, three or more protrusions 213. For example, multiple sets of protrusions 213 may be provided spaced apart along the circumferential direction of the magnetic component 27, with each set containing at least one protrusion 213. This allows for stable support of the magnetic component 27 by the multiple protrusions 213, while also conveniently creating a gap between the magnetic component 27 and the end cap, increasing the thermal resistance between the magnetic component 27 and the end cap, and simultaneously increasing the heat dissipation effect on the magnetic component 27. Furthermore, the heat insulating structure may include multiple sets of protrusions 213 arranged concentrically, with each set containing multiple protrusions 213 arranged along the circumferential direction of the magnetic component 27. Two adjacent sets may have the same number of protrusions 213 or different numbers of protrusions 213. The applicant of this application analyzed the number of protrusions 213, and found that when the number of protrusions 213 is four or three, the temperature rise of the magnetic component 27 is slow and the demagnetization rate of the magnetic component 27 is lowest. In particular, when the number of protrusions 213 is three, the temperature rise of the magnetic component 27 is slowest and the demagnetization rate is lowest. This is because, when three or four protrusions 213 are installed, the minimum number of protrusions 213 is used to provide stable support to the magnetic component 27.

[0035] Specifically, the projection 213 can be supported within the region between the inner and outer circumferential surfaces of the magnetic component 27. Preferably, the projection 213 is supported at a position proportional to a predetermined distance from the inner to the outer circumferential surface of the magnetic component 27, where the predetermined distance may be in the range of 1 / 3 to 2 / 3. For example, the projection 213 is supported at a position halfway between the inner and outer circumferential surfaces of the magnetic component 27. This further increases the gap between the magnetic component 27 and the plate body 212, providing a stable gap between each part of the magnetic component 27 and the plate body 212, further reducing heat conduction and simultaneously facilitating heat dissipation from the magnetic component 27.

[0036] The projection 213 is configured in a frustoconical shape, and its radial size gradually decreases in the direction away from the surface of the plate body 212, where the edges of the projection 213 are chamfered and / or the end faces of the projection 213 are recessed inward. This further reduces the contact area between the plate body 212 and the magnetic component 27, thereby further lowering the rate of heat conduction. Similarly, the gap between the projection 213 and the magnetic component 27 facilitates airflow to circulate and dissipate heat, enhancing the heat dissipation effect and further reducing the rate at which the temperature of the magnetic component 27 rises.

[0037] Furthermore, if the gap between the magnetic component 27 and the plate body 212 is too large or too small, it may affect the stable operation of the magnetic component 27. Therefore, in this application, the height of the projection 213 raised on the surface of the plate body 212 is within the range of millimeters to millimeters, resulting in a gap of 1 to 2 millimeters between the magnetic component 27 and the surface of the plate body 212. Of course, depending on the actual usage conditions, the gap between the magnetic component 27 and the surface of the plate body 212 may be smaller than 1 millimeter or larger than 2 millimeters. It should be adjusted according to the actual heat dissipation requirements and energy efficiency requirements. For example, gaps of 0.5 millimeters, 1 millimeter, 2 millimeters, 4 millimeters, 5 millimeters, 10 millimeters, etc., can be set between the magnetic component 27 and the surface of the plate body 212.

[0038] Alternatively, an insulating layer may be sprayed onto the surface of the magnetic component 27 facing the plate body 212. By installing an insulating layer between the magnetic component 27 and the plate body 212, the thermal resistance can be further effectively increased, and the rate of heat conduction can be reduced. This achieves the effect of reducing the rate at which the temperature of the magnetic component 27 rises.

[0039] Similarly, if the gap between the magnetic component 27 and the plate body 212 is too large or too small, it may affect the stable operation of the magnetic component 27. Therefore, the thickness of the insulation layer is within the range of 1 to 2 millimeters. Of course, depending on the actual usage conditions, the gap between the surface of the magnetic component 27 and the plate body 212 may be smaller than 1 millimeter or larger than 2 millimeters. It should be adjusted according to the actual heat dissipation requirements and energy efficiency requirements. For example, gaps of 0.5 millimeters, 0.7 millimeters, 2.1 millimeters, 2.3 millimeters, 2.5 millimeters, 3 millimeters, etc., can be set between the surface of the magnetic component 27 and the plate body 212.

[0040] In some examples of this invention, an insulating layer is provided on the surface of the magnetic component 27 facing the plate body portion 212, and a projection 213 is provided on the plate body portion 212, with the projection 213 in contact with the insulating layer. By providing the insulating layer and the projection 213, a predetermined gap can be created between the magnetic component 27 and the plate body portion 212, and it is possible to ensure that there is a gap between the magnetic component 27 and the plate body portion 212 to allow airflow to pass through, and insulating can be achieved using the insulating layer. This enhances the effect of insulating and dissipating heat, and further reduces the rate of temperature rise. Here, the total thickness of the insulating layer and the projection 213 may be in the range of 1 millimeter to 2 millimeters.

[0041] In some examples of this application, an insulating layer is provided on the surface of the magnetic component 27 facing the plate body portion 212, and a projection 213 is provided on the plate body portion 212, the insulating layer covers a portion of the surface of the magnetic component 27, and the projection 213 abuts against another portion of the surface of the magnetic component 27. Similarly, by providing the insulating layer and the projection 213, a predetermined gap can be created between the magnetic component 27 and the plate body portion 212, and it can be ensured that there is a gap between the magnetic component 27 and the plate body portion 212 to allow airflow to pass through, and insulating can be achieved using the insulating layer. This enhances the effect of insulating and dissipating heat, and further reduces the rate of temperature rise. Here, the thickness of the insulating layer and the height of the projection 213 may both be within the range of millimeters to millimeters.

[0042] In some embodiments of the present invention, there is a gap between the inner surface of the magnetic component 27 and the outer surface of the tube shell. This separates the magnetic component 27 from the tube shell, reduces heat conduction between the tube shell and the magnetic component 27, and further reduces the rate at which the temperature of the magnetic component 27 rises. The gap between the inner surface of the magnetic component 27 and the outer surface of the tube shell may be left empty, or it may be filled with an insulating layer, or a structure such as a protrusion 213 may be installed between the magnetic component 27 and the tube shell to achieve insulating properties.

[0043] In this invention, by redesigning the heat dissipation of the magnetron 20, the temperature rise of the magnetic heat receiving surface can be significantly reduced, and by spraying an insulating coating on the magnetic heat receiving surface, heat conduction to the vacuum tube magnet can also be reduced.

[0044] As shown in Figure 2, in some embodiments of the present invention, the magnetron 20 further includes a housing 25 and a heat dissipation component 26, the tube core 21 is provided inside the housing 25, and the heat dissipation component 26 is connected between the tube core 21 and the housing 25. The heat dissipation component 26 enables effective heat dissipation from the tube core 21 and provides a stable operating environment for the magnetron 20.

[0045] As shown in Figure 2, the heat dissipation component 26 includes a connector 261, a first support 262, and a second support 263. The connector 261 is connected to the tube core 21, the first support 262 extends inclined so as to connect to the connector 261 and then to the housing 25, and the second support 263 extends inclined so as to connect to the connector 261 and then to the housing 25, with the first support 262 and the second support 263 extending inclined in opposite directions.

[0046] Here, a first fold 264 is provided at the connection portion 261, and the first fold 264 is in close contact with the outer surface of the tube core 21. A second fold 265 is provided at both the first support portion 262 and the second support portion 263, and the second fold 265 is in close contact with the inner surface of the housing 25. This enhances the heat conduction effect between the heat dissipation component 26 and the tube core 21 and housing 25, further improving the heat dissipation effect on the tube core 21.

[0047] In some embodiments of the present invention, the antenna 24 is configured to be elongated in shape, with a circular, elliptical, or rectangular cross-section. This enhances the microwave conduction efficiency and effect, and ensures the performance of the magnetron 20.

[0048] As shown in Figures 1 to 4, the microwave heating apparatus 100 of the embodiment of the present application includes an inner pot 10 and a magnetron 20, the inner pot 10 has a cooking chamber 101, a microwave passage 102 is provided in the wall of the inner pot 10, the magnetron 20 is provided on the outside of the inner pot 10, the magnetron 20 is suitable for supplying microwaves into the inner pot 10 via the microwave passage 102, and the magnetron 20 is the magnetron 20 described above.

[0049] As shown in Figures 1 and 2, the magnetron 20 includes a tube core 21, a heat dissipation system, a magnetic path system, a filter system, an energy output system, and the like. Here, the energy output system includes a second tube shell 21b, an output ceramic 22, an antenna cap 23, an antenna 24, and an exhaust pipe. Here, the cross-sectional shape of the antenna 24 is not limited and can be, for example, circular, elliptical, or rectangular. One end of the antenna 24 is connected to an arbitrary blade in the tube core 21 (anode component), and the other end passes through a hole in the magnetic component 27 and is finally connected to the exhaust pipe via the tube shell and the output ceramic 22. The electromagnetic wave energy generated by the tube core 21 reaches the output ceramic 22 via the configuration formed by the tube shell as the outer conductor and the antenna 24 as the inner conductor, and the antenna cap 23, as a microwave matching configuration, finally outputs the energy to the outside of the magnetron 20, completing the energy output process.

[0050] The present invention relates to an energy output system comprising a second tube shell 21b (metal shell), an output ceramic 22, an antenna cap 23, an antenna 24, and an exhaust pipe. The height H1 of the second tube shell 21b is the distance between the lower surface of the tube core 21 and the upper surface of the output ceramic 22, and S is the cross-sectional area of ​​the antenna 24. When the height H1 of the second tube shell 21b is less than 14 mm, the efficiency reduction problem caused by lowering the height of the second tube shell 21b is solved by synchronously changing the cross-sectional area S of the antenna 24 and the height H1 of the second tube body, thereby increasing the output efficiency of the magnetron 20. Specifically, when the height H1 of the second tube shell 21b is less than 14 mm, the ratio of the height H1 of the second tube shell 21b to the cross-sectional area S of the antenna 24 is 0.4

[0051] According to the microwave heating device 100 of the embodiment of the present application, by installing the magnetron 20, the space occupied by the magnetron 20 can be reduced, enabling miniaturization of the microwave heating device 100 or an increase in the volume of the cooking chamber 101, while guaranteeing the heating performance of the magnetron 20. In other words, it is possible to guarantee miniaturization and a large volume of the microwave heating device 100, as well as increase the energy utilization rate and reduce energy waste, making it energy-saving and environmentally friendly.

[0052] As shown in Figure 4, in some embodiments of the present invention, the microwave passage 102 is configured in a trumpet shape, with its cross-sectional area gradually increasing in the direction toward the cooking chamber 101. This transfers more microwaves into the inner pot 10, effectively increasing the heating efficiency of the microwave heating device 100.

[0053] ​As shown in Figure 1, in some embodiments of the present invention, the output ceramic 22 and antenna cap 23 are located inside the microwave passage 102. This improves the microwave transmission efficiency and effectiveness, reduces the space occupied by the magnetron 20, and increases space utilization.

[0054] Furthermore, the terms “first” and “second” are used solely for descriptive purposes and should not be understood as indicating or suggesting relative importance or specifying the number of technical features being referred to. For this reason, features designated as “first” or “second” may be explicitly or implicitly defined as including at least one such feature. In this specification, “plural” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0055] In this application, unless otherwise explicitly stated and limited, terms such as “attachment,” “connection,” “connection,” and “fixing” should be interpreted broadly, for example, and may include fixed connections, removable connections or integrations, mechanical connections or electrical connections, direct connections or indirect connections via an intermediary, internal communication between two parts, or interaction relationships between two parts. A person skilled in the art will be able to understand the specific meaning of the above terms depending on the specific situation.

[0056] In this application, unless otherwise explicitly stated and limited, when the first feature is "above" or "below" the second feature, the first and second features may be in direct contact or indirectly in contact through an intermediary. Furthermore, when the first feature is "above," "above," or "on the top surface" of the second feature, the first feature may be directly above or diagonally above the second feature, or the first feature may be at a higher horizontal altitude than the second feature. When the first feature is "below," "below," or "on the bottom surface" of the second feature, the first feature may be directly below or diagonally below the second feature, or the first feature may be at a lower horizontal altitude than the second feature.

[0057] In this specification, references to terms such as “one embodiment,” “several embodiments,” “example,” “specific example,” or “several examples” mean that the specific features, structures, materials, or properties described in the embodiment or example are included in at least one embodiment or example of this application. The exemplary expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or properties described can be combined in appropriate ways in any embodiment or example. Also, a person skilled in the art can combine different embodiments or examples and features of different embodiments or examples described herein, provided they do not conflict with each other.

[0058] Furthermore, although the above has already been explained by showing embodiments of the present application, these embodiments are illustrative and cannot be understood as limitations on the present application, and those skilled in the art can change, modify, substitute, and transform the above embodiments within the scope of the present application. [Explanation of symbols]

[0059] 100 Microwave heating device 10 Inner pot 101 Cooking Chamber 102 Microwave Pathway 20 Magnetron 21 Tube core 21a First tube shell 21b Second tube shell 211 Pipe body 212 Main body of the board 213 Protrusion 22 Output Ceramic 23 Antenna cap 24 Antennas 25 Housing 26 Heat dissipation components 261 Connection part 262 First Branch 263 Second Branch 264 First turnaround 265 The second turnaround 27 Magnetic components

Claims

1. A magnetron comprising a tube core (21), a first tube shell (21a), a second tube shell (21b), an output ceramic (22), an antenna cap (23), and an antenna (24), wherein the first tube shell (21a), the tube core (21), the second tube shell (21b), the output ceramic (22), and the antenna cap (23) are sequentially connected. The antenna (24) enters the tube core (21), and sequentially passes through the second tube shell (21b), the output ceramic (22), and enters the antenna cap (23). A magnetron characterized in that the height H1 of the second tube shell (21b) relative to the tube core (21) is 14 mm or less, and the ratio H1 / S of the height H1 of the second tube shell (21b) to the cross-sectional area S of the antenna (24) is in the range of 0.4 to 2.

3.

2. The magnetron according to claim 1, characterized in that the ratio H1 / S of the height H1 of the second tube shell (21b) to the cross-sectional area S of the antenna (24) is in the range of 1.5 to 1.

7.

3. The magnetron according to claim 1, characterized in that the height of the first tube shell (21a) relative to the tube core (21) is less than or equal to the height of the second tube shell (21b) relative to the tube core (21).

4. The magnetron according to claim 1, wherein the first tube shell (21a) and the second tube shell (21b) each include a tube body portion (211) and a plate body portion (212), the plate body portion (212) covers the end of the tube core (21), and the plate body portion (212) is provided with a projection (213) for supporting the magnetic portion which is fitted into the tube body portion (211) such that there is a gap between the magnetic portion and the plate body portion (212).

5. The magnetron (20) further includes a housing (25) and a heat dissipation component (26), the tube core (21) is provided inside the housing (25), the heat dissipation component (26) is connected between the tube core (21) and the housing (25), the heat dissipation component (26) includes a connecting portion (261), a first support portion (262) and a second support portion (263), and the connecting portion (261) and the tube core (21) The magnetron according to claim 1, characterized in that the first branch (262) is connected to the connecting portion (261) and extends inclined to connect to the housing (25), the second branch (263) is connected to the connecting portion (261) and extends inclined to connect to the housing (25), and the first branch (262) and the second branch (263) extend inclined in opposite directions.

6. The magnetron according to claim 5, characterized in that a first fold (264) is provided on the connecting portion (261), the first fold (264) is in close contact with the outer surface of the tube core (21), and a second fold (265) is provided on both the first support portion (262) and the second support portion (263), the second fold (265) is in close contact with the inner surface of the housing (25).

7. The magnetron according to claim 1, characterized in that the antenna (24) is configured to have an elongated shape with a circular, elliptical, or rectangular cross-section.

8. A microwave heating device, Including an inner pot (10) and a magnetron (20), The inner pot (10) has a cooking chamber (101) inside, and a microwave passage (102) is provided in the wall of the inner pot (10). A microwave heating apparatus wherein the magnetron (20) is provided on the outside of the inner pot (10), the magnetron (20) is suitable for providing microwaves into the inner pot (10) via the microwave passage (102), and the magnetron (20) is the magnetron (20) according to any one of claims 1 to 7.

9. The microwave heating apparatus according to claim 8, characterized in that the microwave passage (102) is configured in a trumpet shape, with the cross-sectional area gradually increasing in the direction toward the cooking chamber (101).

10. The microwave heating apparatus according to claim 8, characterized in that the output ceramic (22) and the antenna cap (23) are located inside the microwave passage (102).

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