An excitation structure and microwave oven

Abstract

The embodiment of the present application provides a kind of excitation structure and microwave oven, excitation structure includes waveguide horn antenna and surface wave generating component, waveguide horn antenna has microwave transmission channel, the surface wave generating component includes base and object table, the object table cover is arranged in the base top side to jointly enclose and form surface wave generating cavity, the base is open along the circumferential side and forms transmission port, the waveguide horn antenna is located in the outside of the surface wave generating component, the microwave transmission channel is communicated with the surface wave generating cavity by the transmission port, at least part of the area of the object table near the side of the waveguide horn antenna extends to the top side of the waveguide horn antenna, in the projection plane parallel to the object table, the projection of at least part of the area of the waveguide horn antenna coincides with the projection of the part of the area of the object table.The excitation structure of the embodiment of the present application can improve the use volume rate.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to an excitation structure and a microwave oven. Background Technology

[0002] Microwave ovens, as products that can quickly heat food, are widely used in various social scenarios. As people's living standards improve, the demands for microwave ovens are no longer limited to rapid reheating. Whether defrosting, reheating, or baking, there are extremely high requirements for the uniformity of microwave heating. However, the distribution of the microwave energy field within the microwave oven's cooking cavity changes depending on the type of food being heated, making the uniformity of microwave heating a persistent and difficult problem to overcome.

[0003] In related technologies, a waveguide horn antenna is used to input energy from a microwave source into a microwave oven to generate surface waves for heating, thereby improving heating uniformity. However, the waveguide horn antenna in these technologies is relatively large, which significantly reduces the size of the microwave oven's cooking cavity, thus decreasing the oven's usable volume ratio. Summary of the Invention

[0004] In view of this, the main objective of the embodiments of this application is to provide an excitation structure and microwave oven that can improve the utilization volume ratio.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0006] The first aspect of this application provides an incentive structure, including:

[0007] Waveguide horn antenna with microwave transmission channel;

[0008] A surface wave generating assembly includes a base and a stage. The stage covers the top side of the base to jointly enclose and form a surface wave generating cavity. One side of the base is open in the circumferential direction to form a transmission port. A waveguide horn antenna is located outside the surface wave generating assembly. A microwave transmission channel communicates with the surface wave generating cavity through the transmission port. At least a portion of the stage near the waveguide horn antenna extends to the top side of the waveguide horn antenna. In a projection plane parallel to the stage, the projection of at least a portion of the waveguide horn antenna coincides with the projection of a portion of the stage.

[0009] In one embodiment, the microwave transmission channel includes a first channel and a second channel, the waveguide horn antenna includes a transmission waveguide and a horn antenna, the transmission waveguide has the first channel, the horn antenna has the second channel, the horn antenna is located between the base and the transmission waveguide, and the opposite ends of the second channel are respectively connected to the first channel and the transmission port.

[0010] In one embodiment, the top side of the second channel is open to form an opening, and the side of the stage near the waveguide horn antenna extends toward the opening to form an extension that closes the opening.

[0011] In one embodiment, the horn antenna includes a horn base and a horn top plate covering the top side of the horn base. The horn base and the horn top plate form a second channel. The side of the stage near the waveguide horn antenna extends to the top side of the horn top plate and is spaced apart from the horn top plate.

[0012] In one embodiment, the opening size of the transmission port is larger than the cross-sectional opening size of the first channel, and the cross-sectional opening size of the second channel gradually increases from the end near the first channel to the end near the transmission port.

[0013] In one embodiment, the first channel has a first connection port, and the second channel has a second connection port communicating with the first connection port, wherein the opening size of the second connection port is greater than or equal to the opening size of the first connection port.

[0014] In one embodiment, the second channel has a third connection port communicating with the transmission port, the opening size of the third connection port being less than or equal to the opening size of the transmission port.

[0015] In one embodiment, in a projection plane parallel to the stage, the projection of at least a portion of the waveguide horn antenna coincides with the projection of a portion of the stage, and the distance between the projection of the end of the waveguide horn antenna away from the stage and the projection of the stage is less than or equal to 60 mm.

[0016] In one embodiment, each side of the platform extends horizontally to the outer side of the base.

[0017] In one embodiment, the sidewalls on both sides of the transmission port are folded into the surface wave generating cavity to form a connecting flange, and the end of the waveguide horn antenna near the transmission port is connected to the connecting flange.

[0018] In one embodiment, the surface wave generating assembly includes a plurality of metal corrugated sheets, each of which is spaced apart within the surface wave generating cavity.

[0019] A second aspect of this application provides a microwave oven, including a housing and any of the excitation structures described above. The excitation structure is disposed on the bottom side of the housing, and the platform and the housing together form a cooking cavity.

[0020] This application provides an excitation structure and a microwave oven. The excitation structure includes a waveguide horn antenna and a surface wave generating assembly. The waveguide horn antenna is located outside the surface wave generating assembly. A microwave transmission channel communicates with the surface wave generating cavity through a transmission port. At least a portion of the stage near the waveguide horn antenna extends to the top of the waveguide horn antenna. In a projection plane parallel to the stage, the projection of at least a portion of the waveguide horn antenna coincides with the projection of a portion of the stage. By extending the stage to the top of the waveguide horn antenna, at least a portion of the waveguide horn antenna can be hidden to the bottom of the stage, thereby reducing the area of ​​the waveguide horn antenna outside the projection range of the stage. Therefore, with the microwave oven's external dimensions unchanged, by reducing the area of ​​the waveguide horn antenna outside the projection range of the stage and by extending the stage to increase its structural dimensions, the size of the cooking cavity formed by the stage and the microwave oven's casing can be expanded, thereby increasing the microwave oven's usable volume ratio. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an excitation structure according to an embodiment of this application;

[0022] Figure 2 for Figure 1 The front view;

[0023] Figure 3 for Figure 2 Top view;

[0024] Figure 4 for Figure 2 Side view;

[0025] Figure 5 for Figure 1 The enlarged view at point A shows only the partial structure of the base and waveguide horn antenna.

[0026] Explanation of reference numerals in the attached figures

[0027] 10. Excitation structure; 11. Waveguide horn antenna; 11a. Microwave transmission channel; 11b. First channel; 11c. Second channel; 11d. First connecting port; 11e. Second connecting port; 11f. Third connecting port; 111. Transmission waveguide; 112. Horn antenna; 12. Surface wave generating assembly; 12a. Surface wave generating cavity; 12b. Transmission port; 121. Base; 1211. Connecting flange; 122. Stage; 1221. Extension; 123. Metal corrugated sheet. Detailed Implementation

[0028] In this application, the orientation or positional relationship of "top" and "bottom" is based on the appendix. Figure 2The orientation or positional relationship shown is for illustrative purposes only and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0029] One embodiment of this application provides an excitation structure 10, please refer to... Figures 1 to 5 It includes a waveguide horn antenna 11 and a surface wave generating component 12. The waveguide horn antenna 11 has a microwave transmission channel 11a.

[0030] The surface wave generating assembly 12 includes a base 121 and a stage 122. The stage 122 covers the top side of the base 121 to jointly form a surface wave generating cavity 12a. The base 121 is open on one side in the circumferential direction to form a transmission port 12b. The waveguide horn antenna 11 is located outside the surface wave generating assembly 12. The microwave transmission channel 11a is connected to the surface wave generating cavity 12a through the transmission port 12b.

[0031] At least a portion of the stage 122 near the waveguide horn antenna 11 extends to the top side of the waveguide horn antenna 11. In a projection plane parallel to the stage 122, the projection of at least a portion of the waveguide horn antenna 11 coincides with the projection of a portion of the stage 122.

[0032] Another embodiment of this application provides a microwave oven, including a housing and an excitation structure 10 as described in any embodiment of this application. The excitation structure 10 is disposed on the bottom side of the housing, and the platform 122 and the housing together form a cooking cavity.

[0033] Specifically, the excitation structure 10 can be used to transmit microwaves and generate surface waves through excitation to heat food by means of surface waves.

[0034] The microwave transmission channel 11a transmits microwaves input from a microwave source to a surface wave generating cavity 12a. The surface wave generating assembly 12 generates surface waves using the microwaves transmitted to the surface wave generating cavity 12a. For example, the surface wave generating assembly 12 includes a surface wave excitation structure 10 disposed within the surface wave generating cavity 12a. After the microwaves generated by the microwave source are input into the surface wave generating cavity 12a via the waveguide horn antenna 11, surface waves are generated by the surface wave excitation structure 10 to heat the food in the cooking cavity.

[0035] It should be noted that the specific structure of the surface wave excitation structure 10 can be set according to the actual situation, such as a metal pleated structure or a dielectric strip array structure.

[0036] For example, please refer to Figure 1 and Figure 3The surface wave generating assembly 12 includes a plurality of metal corrugated sheets 123, each of which is spaced apart within the surface wave generating cavity 12a.

[0037] Specifically, the microwaves input from the microwave source are transmitted into the surface wave generating cavity 12a through the waveguide horn antenna 11, which can excite uniform longitudinal and transverse surface waves on each metal corrugated sheet 123. The surface wave energy can cover most of the microwave oven area and the generated reflections are small, thereby improving the heating uniformity.

[0038] The platform 122 is used to hold food and can be enclosed with the shell of the microwave oven to form a cooking cavity, in which the food to be heated is placed.

[0039] It should be noted that the excitation structure 10 is located on the bottom side of the housing, and the entire area of ​​the housing may be located above the excitation structure 10. Of course, a portion of the housing may also extend to the bottom side of the platform 122. The platform 122 and the housing above it form a cooking cavity, that is, the cooking cavity is located above the platform 122.

[0040] The base 121 is located on the bottom side of the platform 122 and is used to support the platform 122. The surface wave generating cavity 12a is formed by the base 121 and the platform 122. It is understood that the surface waves generated in the surface wave generating cavity 12a can be transmitted to the cooking cavity to heat the food in the cooking cavity.

[0041] The base 121 has a transmission port 12b on its side, which connects the microwave transmission channel 11a and the surface wave generating cavity 12a, allowing microwaves from the microwave transmission channel 11a to enter the surface wave generating cavity 12a.

[0042] The waveguide horn antenna 11 is located outside the surface wave generating component 12. It can be understood that the microwave transmission channel 11a is connected to the transmission port 12b, so the end of the waveguide horn antenna 11 near the surface wave generating component 12 extends to the transmission port 12b.

[0043] For example, the sidewalls on both sides of the transmission port 12b are folded into the surface wave generating cavity 12a to form a connecting flange 1211, and the end of the waveguide horn antenna 11 near the transmission port 12b is connected to the connecting flange 1211.

[0044] Specifically, the sidewalls on both sides of the transmission port 12b are actually: the base 121 is used to form the transmission port 12b and the wall is spaced in the horizontal direction. By folding to form the connecting flange 1211, it can be easily connected to the waveguide horn antenna 11.

[0045] Of course, depending on the actual situation, the side walls on both sides of the transmission port 12b can also be folded outwards towards the base 121.

[0046] Alternatively, the entire area of ​​the side of the stage 122 closest to the waveguide horn antenna 11 can extend to the top side of the waveguide horn antenna 11, or a portion of the side of the stage 122 closest to the waveguide horn antenna 11 can extend to the top side of the waveguide horn antenna 11.

[0047] In a projection plane parallel to the stage 122, the projection of at least a portion of the waveguide horn antenna 11 coincides with the projection of a portion of the stage 122. The extended region of the stage 122 can cover part or all of the waveguide horn antenna 11, meaning that part or all of the waveguide horn antenna 11 is located on the underside of the extended region of the stage 122. From a projection perspective, the projections of the two partially overlap.

[0048] Therefore, by extending the platform 122, the size of the platform 122 can be increased, thereby expanding the area of ​​the cooking cavity formed by the platform 122 and the shell, which in turn can improve the usable volume ratio of the microwave oven and facilitate assembly.

[0049] It should be noted that the stage 122 may be a side extension only close to the waveguide horn antenna 11. Of course, depending on the actual situation, the sidewalls of the other sides of the stage 122 may also extend outward.

[0050] For example, please see Figure 1 and Figure 3 The sides of the platform 122 extend horizontally to the outside of the base 121. In other words, the sides of the platform 122 extend to the outside of the base 121, thereby further increasing the area of ​​the cooking cavity.

[0051] The excitation structure 10 of this embodiment includes a waveguide horn antenna 11 and a surface wave generating assembly 12. The waveguide horn antenna 11 is located outside the surface wave generating assembly 12. A microwave transmission channel 11a is connected to the surface wave generating cavity 12a through a transmission port 12b. At least a portion of the stage 122 near the waveguide horn antenna 11 extends to the top side of the waveguide horn antenna 11. In a projection plane parallel to the stage 122, the projection of at least a portion of the waveguide horn antenna 11 coincides with the projection of a portion of the stage 122. By extending the stage 122 to the top side of the waveguide horn antenna 11, at least a portion of the waveguide horn antenna 11 can be hidden to the bottom side of the stage 122, thereby reducing the area of ​​the waveguide horn antenna 11 outside the projection range of the stage 122. Therefore, it can be seen that, with the external dimensions of the microwave oven remaining unchanged, by reducing the area outside the projection range of the waveguide horn antenna 11 located outside the projection range of the platform 122, and by extending the platform 122 to increase its structural dimensions, the size of the cooking cavity formed by the platform 122 and the microwave oven shell can be expanded, thereby increasing the usable volume ratio of the microwave oven.

[0052] In fact, the overall length of waveguide horn antennas in related technologies can reach 100mm.

[0053] In one embodiment, in a projection plane parallel to the stage 122, the projection of at least a portion of the waveguide horn antenna 11 coincides with the projection of a portion of the stage 122, and the distance between the projection of the end of the waveguide horn antenna 11 away from the stage 122 and the projection of the stage 122 is less than or equal to 60 mm. For example, 30 mm or 60 mm.

[0054] Therefore, by extending the stage 122, the area outside the coverage area of ​​the waveguide horn antenna 11 can be greatly reduced. While ensuring good transmission performance of the waveguide horn antenna 11, extending the stage 122 so that the length of the area outside the stage 122 is less than or equal to 60 mm allows the cooking cavity to be large enough, thus achieving a good usable volume ratio.

[0055] In one embodiment, please refer to Figure 2 and Figure 5 The microwave transmission channel 11a includes a first channel 11b and a second channel 11c. The waveguide horn antenna 11 includes a transmission waveguide 111 and a horn antenna 112. The transmission waveguide 111 has the first channel 11b, and the horn antenna 112 has the second channel 11c. The horn antenna 112 is located between the base 121 and the transmission waveguide 111. The two ends of the second channel 11c are respectively connected to the first channel 11b and the transmission port 12b. Therefore, it is convenient to transmit the microwaves generated by the microwave source to the surface wave generating cavity 12a.

[0056] Specifically, the waveguide horn antenna 11 is disposed on the side of the base 121 with the transmission port 12b. The transmission waveguide 111 is used to transmit the microwave generated by the microwave source to the horn antenna 112, and then the horn antenna 112 transmits the microwave to the surface wave generating cavity 12a through the transmission port 12b.

[0057] It should be noted that the specific structure of the transmission waveguide 111 and the horn antenna 112 can be set according to the actual situation.

[0058] For example, the top side of the second channel 11c is open to form an opening, and the side of the stage 122 near the waveguide horn antenna 11 extends toward the opening to form an extension 1221 that closes the opening.

[0059] Specifically, the top opening of the second channel 11c is closed by the extension 1221 of the stage 122. This ensures, on the one hand, that the second channel 11c can effectively transmit microwaves into the surface wave generating cavity 12a. On the other hand, it allows for better utilization of the extension 1221 formed by the stage 122, eliminating the need for an additional top plate to close the top of the second channel 11c. This also allows for a better integration of the stage 122 and the horn antenna 112.

[0060] For example, the horn antenna 112 includes a horn base 121 and a horn top plate covering the top side of the horn base 121. The horn base 121 and the horn top plate form a second channel 11c. The side of the stage 122 near the waveguide horn antenna 11 extends to the top side of the horn top plate and is spaced apart from the horn top plate.

[0061] Specifically, the horn antenna 112 and the stage 122 can also be separated from each other, that is, the horn base 121 and the horn top plate enclose the second channel 11c, and the stage 122 is not used to close the second channel 11c. This facilitates processing and manufacturing.

[0062] In one embodiment, please refer to Figure 1 and Figure 3 The opening size of the transmission port 12b is larger than the cross-sectional opening size of the first channel 11b. From the end near the first channel 11b to the end near the transmission port 12b, the cross-sectional opening size of the second channel 11c gradually increases.

[0063] Specifically, the microwaves input from the microwave source pass sequentially through the first channel 11b and the second channel 11c, and are transmitted from the transmission port 12b into the surface wave generating cavity 12a. Therefore, by increasing the opening size of the transmission port 12b, so that the cross-sectional opening size of the horn antenna 112 gradually increases towards the transmission port 12b, more energy transmitted in the microwave transmission channel 11a can be radiated into the surface wave generating cavity 12a, facilitating microwave transmission along the microwave transmission channel 11a.

[0064] The specific structural form of the horn antenna 112 is not limited, such as the cross-sectional shape of the horn antenna 112 being trapezoidal, circular, rectangular or other shapes.

[0065] In one embodiment, please refer to Figure 5 The first channel 11b has a first connecting port 11d, and the second channel 11c has a second connecting port 11e that connects to the first connecting port 11d. The opening size of the second connecting port 11e is greater than or equal to the opening size of the first connecting port 11d.

[0066] Therefore, it is possible to avoid the formation of a stepped surface facing the first channel 11b at the connection between the horn antenna 112 and the transmission waveguide 111 due to the smaller opening size of the second connection port 11e than that of the first connection port 11d. This facilitates the transmission of microwaves from the first channel 11b to the second channel 11c.

[0067] In one embodiment, please refer to Figure 5 The second channel 11c has a third communication port 11f that communicates with the transmission port 12b. The opening size of the third communication port 11f is less than or equal to the opening size of the transmission port 12b.

[0068] Therefore, it is possible to avoid the formation of a stepped surface facing the second channel 11c at the connection between the horn antenna 112 and the base 121 due to the smaller opening size of the transmission port 12b than the opening size of the third communication port 11f. This facilitates the transmission of microwaves from the second channel 11c to the surface wave generating cavity 12a.

[0069] In one specific embodiment, by extending the side of the stage 122, the structural size of the waveguide horn antenna 11 located outside the coverage area of ​​the stage 122 can be reduced by 40%, and the usable volume ratio of the microwave oven can be increased by 10%.

[0070] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in a specific embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. An excitation structure, characterized in that, include: Waveguide horn antenna with microwave transmission channel; A surface wave generating assembly includes a base and a stage. The stage covers the top side of the base to jointly enclose and form a surface wave generating cavity. One side of the base is open in the circumferential direction to form a transmission port. A waveguide horn antenna is located outside the surface wave generating assembly. A microwave transmission channel communicates with the surface wave generating cavity through the transmission port. At least a portion of the stage near the waveguide horn antenna extends to the top side of the waveguide horn antenna. In a projection plane parallel to the stage, the projection of at least a portion of the waveguide horn antenna coincides with the projection of a portion of the stage.

2. The excitation structure according to claim 1, characterized in that, The microwave transmission channel includes a first channel and a second channel. The waveguide horn antenna includes a transmission waveguide and a horn antenna. The transmission waveguide has the first channel, and the horn antenna has the second channel. The horn antenna is located between the base and the transmission waveguide. The two opposite ends of the second channel are respectively connected to the first channel and the transmission port.

3. The excitation structure according to claim 2, characterized in that, The top side of the second channel is open to form an opening, and the side of the stage near the waveguide horn antenna extends toward the opening to form an extension that closes the opening.

4. The excitation structure according to claim 2, characterized in that, The horn antenna includes a horn base and a horn top plate covering the top side of the horn base. The horn base and the horn top plate form the second channel. The side of the stage near the waveguide horn antenna extends to the top side of the horn top plate and is spaced apart from the horn top plate.

5. The excitation structure according to any one of claims 2-4, characterized in that, The opening size of the transmission port is larger than the cross-sectional opening size of the first channel, and the cross-sectional opening size of the second channel gradually increases from the end near the first channel to the end near the transmission port.

6. The excitation structure according to claim 5, characterized in that, The first channel has a first connection port, and the second channel has a second connection port that communicates with the first connection port. The opening size of the second connection port is greater than or equal to the opening size of the first connection port.

7. The excitation structure according to claim 5, characterized in that, The second channel has a third connection port that communicates with the transmission port, and the opening size of the third connection port is less than or equal to the opening size of the transmission port.

8. The excitation structure according to any one of claims 1-4, characterized in that, The distance between the projection of the end of the waveguide horn antenna away from the stage and the projection of the stage is less than or equal to 60 mm.

9. The excitation structure according to any one of claims 1-4, characterized in that, The platform extends horizontally to the outer side of the base along each side of its circumference.

10. The excitation structure according to any one of claims 1-4, characterized in that, The sidewalls on both sides of the transmission port are folded into the surface wave generating cavity to form connecting flanges, and the end of the waveguide horn antenna near the transmission port is connected to the connecting flange.

11. The excitation structure according to any one of claims 1-4, characterized in that, The surface wave generating component includes multiple metal corrugated sheets, each of which is spaced apart within the surface wave generating cavity.

12. A microwave oven, characterized in that, The device includes a housing and an excitation structure as described in any one of claims 1-11, wherein the excitation structure is disposed on the bottom side of the housing, and the platform and the housing together form a cooking cavity.

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