Microwave device
By setting vertical first waveguide and second waveguide holes in the microwave device, instead of the mode agitator, the problem of degradation of heating efficiency is solved, and more uniform and efficient microwave heating is achieved.
Patent Information
- Application Number
- CN202420598948.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-03-26
AI Technical Summary
Setting up a mode agitator in existing microwave devices will result in a decrease in heating efficiency.
By providing the first waveguide and the second waveguide in the microwave device and making the first waveguide hole and the second waveguide hole perpendicular to each other, in an alternative mode agitator, the uniformity of microwave heating is enhanced.
The efficiency of microwave heating is improved, the damage to the microwave generator by reflected microwaves is reduced, and the energy coupling brought by the mode agitator is also reduced.
Smart Images
Figure CN222582613U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of microwave heating, in particular to a microwave device. Background Art
[0002] Microwaves have excellent properties such as heating and sterilization. With the maturity of microwave technology, they are used in various fields. In related technologies, microwave devices are mostly fed at the bottom of the cavity, and a mode stirrer is added to the waveguide port to enhance the uniformity of microwave heating. Although the microwave field distribution of the cavity can be continuously changed to a certain extent, the mode stirrer will cause a certain amount of microwave emission, reducing the heating efficiency. Utility Model Content
[0003] The utility model aims to provide a microwave device, aiming to improve the situation that the heating efficiency is reduced due to the arrangement of a mode stirrer.
[0004] According to the utility model, a microwave device is provided, comprising: a box body, having a containing cavity; a first waveguide, having at least two first waveguide holes, at least two of which are arranged along the length direction of the first waveguide; and a second waveguide, both of which are arranged at the bottom of the box body and in parallel with the first waveguide, the second waveguide having at least two second waveguide holes, at least two of which are arranged along the length direction of the second waveguide; wherein at least two of the second waveguide holes and at least two of the first waveguide holes are communicated with the containing cavity, and any of the first waveguide holes and any of the second waveguide holes are perpendicular to each other.
[0005] Optionally, any one of the first waveguide holes is perpendicular to the length direction of the first waveguide; and / or any one of the second waveguide holes is parallel to the length direction of the second waveguide.
[0006] Optionally, two adjacent second waveguide holes are spaced apart along a width direction of the second waveguide.
[0007] Optionally, the microwave device includes a power divider, and the first waveguide and the second waveguide are electrically connected to the power divider respectively.
[0008] Optionally, a tray for the material to be heated is provided in the accommodating chamber, and the tray is spaced apart from the first waveguide and the second waveguide respectively.
[0009] Optionally, the tray is made of one of glass, polytetrafluoroethylene and ceramic.
[0010] Optionally, the box body includes a first circumferential wall and a side wall, the side wall is respectively arranged opposite to the first waveguide and the second waveguide, the first circumferential wall is arranged around the side plate, and when observed along the cross section of the box body, the first circumferential wall is inclined toward the outside of the accommodating cavity.
[0011] Optionally, when observed along the cross section of the box body, the angle between the first peripheral wall and the side wall is 45°.
[0012] Optionally, the box body includes a second circumferential wall; the second circumferential wall is arranged around the first waveguide hole and the second waveguide hole, and when observed along the cross section of the box body, the second circumferential wall is inclined toward the outside of the accommodating cavity.
[0013] Optionally, when observed along the cross section of the box body, the angle between the second peripheral wall and the first waveguide is 45°.
[0014] The utility model replaces the mode stirrer to enhance the uniformity of microwave heating by arranging the first waveguide and the second waveguide, and the first waveguide hole and the second waveguide hole are perpendicular to each other. In addition, the first waveguide and the second waveguide are vertically polarized, so that the directions of the electric fields coupled into the accommodating cavity of the box body are also perpendicular to each other, reducing the energy coupling between the first waveguide and the second waveguide, thereby improving the microwave heating efficiency, and also reducing the damage of the reflected microwave to the microwave generator.
[0015] Additional aspects and advantages of the embodiments of the present invention will be described, shown, or explained in part in the following descriptions through implementation of the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.
[0017] Figure 1 A schematic diagram of the structure of a microwave device provided in one embodiment of the utility model;
[0018] Figure 2 for Figure 1 A schematic diagram of the structure of the microwave device at another angle is shown;
[0019] Figure 3 for Figure 1 The microwave device is shown in a structural perspective view at another angle;
[0020] Figure 4 for Figure 1A schematic diagram of the electric field emitted from the first waveguide hole and the second waveguide hole in the microwave device is shown;
[0021] 10. Box body; 11. Side wall; 12. First peripheral wall; 13. Second peripheral wall; 14. Third peripheral wall;
[0022] 20. first waveguide; 20a. first waveguide hole;
[0023] 30. second waveguide; 30a. second waveguide hole;
[0024] 40. Pallet;
[0025] X, length direction; Y, width direction. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments.
[0027] The reference to "embodiment" in the present invention means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.
[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0029] The terms "upper", "lower", "top", "bottom" and the like used below indicate directions or positional relationships. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in this specification are for illustrative purposes only.
[0030] The technical features involved in the different embodiments of the present invention described below can be combined with each other as long as there is no conflict between them.
[0031] Figure 1 This is a schematic diagram of a microwave device provided in one embodiment of the utility model. First, see Figure 1 The example shown is Figure 1 As shown, the microwave device comprises: a box 10 having a containing cavity (not shown); a first waveguide 20 and a second waveguide 30 are both installed in the box 10; the first waveguide 20 is provided with a first waveguide hole 20a, the second waveguide 30 is provided with a second waveguide hole 30a, and the second waveguide hole 30a and the first waveguide hole 20a are both connected to the containing cavity; a microwave generator is installed outside the box 10 and is electrically connected to the first waveguide 20 and the second waveguide 30. The microwave generated by the microwave generator feeds energy into the containing cavity through the first waveguide hole 20a and the second waveguide hole 30a, and is repeatedly reflected on the inner side wall 11 of the box 10, so that the microwave distribution of the microwave field in the box 10 is uniform, so that the material to be heated is uniformly heated. It should be noted that a more detailed introduction of the microwave generator mentioned here can refer to the prior art, and will not be described in detail here.
[0032] The box 10 is generally hollow and defines a cavity for accommodating the material to be heated. In some embodiments, the box 10 may be made of a microwave shielding material to reduce microwave leakage. Examples of such microwave shielding materials include metals such as aluminum, copper, or steel.
[0033] Specifically, the box 10 is a hollow prism structure, and its cross section is roughly polygonal and has at least four sides, that is, the box 10 is rectangular. Further, the vertical section of the box 10 is polygonal and has at least five sides, thereby further changing the reflection direction of the microwave and the inner wall 11, so that the heated material is heated more evenly.
[0034] like Figure 1 and Figure 2 As shown, in some embodiments, the box body 10 includes: a side wall 11, which is located at the top of the box body 10; a peripheral wall, which includes a first peripheral wall 12, a second peripheral wall 13, and a third peripheral wall 14, the first peripheral wall 12 surrounds the side wall 11 and is integrally connected to the side wall 11, the second peripheral wall 13 surrounds the first waveguide hole 20a and the second waveguide hole 30a and is respectively integrally connected to the first waveguide 20 and the second waveguide 30, the second peripheral wall 13 is integrally connected to the first peripheral wall 12 through the third peripheral wall 14, so that the peripheral wall and the side wall 11 are enclosed together to form the aforementioned accommodation cavity. It should be noted here that the first peripheral wall 12, the second peripheral wall 13, and the third peripheral wall 14 are different parts of the peripheral wall along its axial direction, and do not refer to different components on the box body 10.
[0035] from Figure 2It can be seen that in some embodiments, when observed along the cross section of the box body 10, the first peripheral wall 12 is inclined toward the outside of the accommodating cavity. Preferably, the angle α1 between the first peripheral wall 12 and the side wall 11 is 45°, that is, the first peripheral wall 12 is chamfered. In this way, the diffuse reflection of microwaves can be reduced, thereby reducing the loss of microwave energy, and the energy can be effectively transferred to the material to be heated, thereby improving the heating speed and uniformity. In addition, the chamfering can reduce signal attenuation, and the feed port emission coefficient can also be reduced to improve the heating performance of the microwave device.
[0036] You can also Figure 2 It can be seen that in some embodiments, the second peripheral wall 13 is inclined toward the outside of the accommodating cavity when viewed along the cross section of the box body 10. Preferably, the angle α2 between the second peripheral wall 13 and the first waveguide 20 is 45°, that is, the second peripheral wall 13 is chamfered. Based on similar reasons to the chamfering of the first peripheral wall 12, the heating speed and uniformity can also be improved.
[0037] Of course, the structure of the box 10 is not limited thereto. For example, in other embodiments, the transverse and longitudinal cross-sections of the box 10 are polygonal in shape with at least five sides, that is, the box 10 is a hollow multi-prism structure other than the aforementioned pentagonal prism.
[0038] like Figure 2 As shown, in some embodiments, a tray 40 for placing the material to be heated is provided in the accommodating cavity, and the tray 40 is spaced apart from the material to be heated when viewed along the longitudinal section of the box body 10. As an example, the tray 40 can be made of a PTFE tray 40, a glass tray 40, a ceramic tray 40 or a PP tray 40 (glass fiber reinforced polypropylene tray 40) with a weak microwave absorption capability. With this technical solution, since a certain distance is maintained between the support plate and the material to be heated, the microwaves fed from the first waveguide hole 20a and the second waveguide hole 30a can diffuse through the space. In addition, it can also improve the situation where the material to be heated is too close to the waveguide hole and causes local overheating.
[0039] It is understandable that the various embodiments of the present invention do not limit the specific connection method between the tray 40 and the box body 10. For example, in some embodiments, the tray 40 can be detachably connected to the accommodating cavity by means of an additional connection structure such as a bracket. For another example, in other embodiments, a platform for placing the tray 40 is formed inside the box body 10, and the tray 40 is placed on the platform.
[0040] For the first waveguide 20, please combine Figure 4 or Figure 3 See also Figure 1In the example shown, in some embodiments, the first waveguide 20 is generally in the shape of a long strip, and includes two rectangular metal plates and four metal side guide plates. The four metal side guide plates are sequentially connected end to end and are respectively connected to the periphery of the two metal plates, and they together form the cavity of the first waveguide 20. Among them, the first waveguide hole 20a is opened in a corresponding metal plate and communicates with the accommodating cavity.
[0041] like Figure 3 or Figure 4 As shown, in some embodiments, the cross-sectional shape of the first waveguide hole 20a is roughly oval. The extension direction of the oval hole is perpendicular to the length direction X of the first waveguide. It should be noted that the first waveguide hole 20a should not be parallel or perpendicular to the cross section of the first waveguide 20 or the second waveguide 30, which is conducive to the microwave generating more chaotic patterns in the accommodating cavity, making the heating more uniform.
[0042] Specifically, the number of the first waveguide holes 20a is at least two, and the at least two first waveguide holes 20a are arranged at intervals along the length direction X of the first waveguide 20. The interval between adjacent first waveguide holes 20a is a half wavelength interval.
[0043] Of course, the shape of the first waveguide hole 20a is not limited thereto. For example, in other embodiments, the first waveguide hole 20a may also be substantially a rectangular hole or other regular shapes.
[0044] For the second waveguide 30, since the structural difference between the second waveguide 30 and the first waveguide 20 is mainly reflected in the different extension directions of the first waveguide hole 20a and the second waveguide hole 30a, the specific structure of the second waveguide 30 is not described again, and reference is made to the description related to the structure of the first waveguide 20.
[0045] like Figure 3 or Figure 4 As shown, in some embodiments, the cross-sectional shape of the second waveguide hole 30a is substantially oval. The extending direction of the oval hole is parallel to the length direction X of the second waveguide 30. It should be noted that the second waveguide hole 30a should not be parallel or perpendicular to the cross section of the first waveguide 20 or the second waveguide 30, which is conducive to the microwave generating more chaotic patterns in the accommodating cavity and making the heating more uniform.
[0046] Specifically, the number of the second waveguide holes 30a is at least two, and at least two second waveguide holes 30a are arranged at intervals along the length direction X of the second waveguide 30. The spacing between adjacent second waveguide holes 30a is a spacing of half a wavelength. Further, adjacent second waveguide holes 30a are arranged at intervals along the width direction Y of the second waveguide 30, that is, two adjacent second waveguide holes 30a are respectively located on two different straight lines extending along the length direction X, so that the positions at which microwaves are fed into the accommodating cavity from different second waveguide holes 30a are different, so that the accommodating cavity has more microwave field modes.
[0047] In some embodiments, any first waveguide hole 20 a is perpendicular to the length direction X of the first waveguide, and any second waveguide hole 30 a is parallel to the length direction X of the second waveguide 30 .
[0048] Of course, the shape of the second waveguide hole 30a is not limited thereto. For example, in other embodiments, the second waveguide hole 30a may also be substantially a rectangular hole or other regular shapes.
[0049] In order to ensure the quality and efficiency of microwave transmission inside the waveguide, and to improve the leakage, reflection and interference of the waveguide, thereby improving the performance and reliability of the microwave device. In some embodiments, the length of each waveguide hole should be greater than the spacing between two adjacent waveguide holes. It should be noted that the length of each waveguide hole mentioned here should be greater than the spacing between two adjacent waveguide holes based on a single waveguide, and this situation does not apply to two adjacent waveguide holes in two waveguides.
[0050] In some embodiments, the microwave device includes a power divider (not shown), and the first waveguide 20 and the second waveguide 30 are connected to the microwave generator through the power divider, so the power divider can evenly distribute the energy generated by the microwave generator to the first waveguide 20 and the second waveguide 30.
[0051] Of course, the microwave device may distribute the energy generated by the microwave generator to the first waveguide 20 and the second waveguide 30 without using a power divider. For example, in other embodiments, there may be two microwave generators, one connected to the first waveguide 20 and the other connected to the second waveguide 30. By adjusting the power of the two microwave generators, the energy of the first waveguide 20 and the second waveguide 30 can be evenly distributed. In addition, the simultaneous feeding of the two microwave generators can also greatly increase the power density in the accommodation cavity and further shorten the heating time.
[0052] In summary, the utility model replaces the mode stirrer to enhance the uniformity of microwave heating by arranging the first waveguide 20 and the second waveguide 30, and the first waveguide hole 20a and the second waveguide hole 30a are perpendicular to each other. In addition, the first waveguide 20 and the second waveguide 30 are each vertically polarized, so that the directions of the electric fields coupled into the accommodating cavity of the box body 10 are also perpendicular to each other, which reduces the energy coupling between the first waveguide 20 and the second waveguide 30, thereby improving the microwave heating efficiency, and also reduces the damage of the reflected microwave to the microwave generator.
[0053] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A microwave device, characterized in that: include: A box body having a containing cavity; A first waveguide is provided with at least two first waveguide holes, wherein the at least two first waveguide holes are arranged along a length direction of the first waveguide; as well as A second waveguide, which is arranged at the bottom of the box body together with the first waveguide and is arranged in parallel with the first waveguide, wherein the second waveguide is provided with at least two second waveguide holes, and the at least two second waveguide holes are arranged along the length direction of the second waveguide; At least two of the second waveguide holes and at least two of the first waveguide holes are connected to the accommodating cavity, and any one of the first waveguide holes and any one of the second waveguide holes are perpendicular to each other.
2. The microwave device according to claim 1, characterized in that Any of the first waveguide holes is perpendicular to the length direction of the first waveguide; and / or Any second waveguide hole is parallel to the length direction of the second waveguide.
3. The microwave device according to claim 1, characterized in that: Two adjacent second waveguide holes are spaced apart from each other along the width direction of the second waveguide.
4. The microwave device according to any one of claims 1 to 3, characterized in that: The microwave device includes a power divider, and the first waveguide and the second waveguide are electrically connected to the power divider respectively.
5. The microwave device according to any one of claims 1 to 3, characterized in that: A tray for the material to be heated is arranged in the accommodating cavity, and the tray is spaced apart from the first waveguide and the second waveguide respectively.
6. The microwave device according to claim 5, characterized in that: The tray is made of one of glass, polytetrafluoroethylene and ceramics.
7. The microwave device according to any one of claims 1 to 3, characterized in that: The box body includes a first peripheral wall and a side wall, wherein the side wall is respectively arranged opposite to the first waveguide and the second waveguide, and the first peripheral wall is arranged around the side plate. When observed along the cross section of the box body, the first peripheral wall is inclined toward the outside of the accommodating cavity.
8. The microwave device according to claim 7, characterized in that: Observing along the cross section of the box body, the angle between the first peripheral wall and the side wall is 45°.
9. The microwave device according to claim 7, characterized in that: The box body includes a second peripheral wall; The second peripheral wall is disposed around the first waveguide hole and the second waveguide hole. When viewed along the cross section of the box body, the second peripheral wall is inclined toward the outside of the accommodating cavity.
10. The microwave device according to claim 9, characterized in that Observing along the cross section of the box body, the angle between the second peripheral wall and the first waveguide is 45°.