Microwave waveguide

Abstract

The invention discloses a microwave waveguide, which comprises a rectangular section waveguide, a cylindrical section waveguide and a flange, wherein the rectangular waveguide section is communicated with the cylindrical waveguide section; the upper and lower surfaces of the rectangular waveguide are planar structures, and the front and rear surfaces are arc surface structures; a plurality of first mounting holes and microwave emission holes are formed below the rectangular section waveguide; the flange is arranged on the outer side of the cylindrical waveguide, and a plurality of second mounting holes are formed in the circumferential direction of the flange. According to the invention, the microwave efficiency can be improved from about 50% to about 90%.

Description

Technical Field

[0001] The present invention relates to the field of waveguide technology, in particular to a microwave waveguide. Background Art

[0002] Microwave equipment is a type of equipment widely used in heating, concentrating, drying and sterilizing food, pharmaceuticals and chemicals.

[0003] At present, all microwave equipment adopts the structure of microwave power supply + magnetron + wide-mouth waveguide. Although microwave power supply and magnetron vary from manufacturer to manufacturer, the difference is not big. Wide-mouth waveguide varies greatly from manufacturer to manufacturer, but the structure is mostly horn-shaped, with round or square mouth, and is installed on the outer wall of microwave equipment host to emit microwaves into the microwave equipment.

[0004] Taking the traditional cylindrical microwave excitation cavity that has not been professionally designed as an example, its excitation efficiency, that is, what percentage of microwaves of the magnetron antenna can be excited in the excitation cavity, is generally less than 50%, resulting in huge energy waste and seriously reducing the life of magnetron components.

[0005] The patent document with publication number CN118031574A discloses a tunnel-type microwave vacuum ultra-low temperature drying equipment and a material drying process. Since the cavity used in the invention has a large internal space, a waveguide with higher excitation efficiency is required to reduce power consumption as much as possible. Summary of the invention

[0006] According to an embodiment of the present invention, there is provided a microwave waveguide, comprising: Rectangular segment waveguide, cylindrical segment waveguide and flange; The rectangular section waveguide and the cylindrical section waveguide are connected; The upper and lower surfaces of the rectangular waveguide are planar structures, and the front and rear surfaces are arc structures; A plurality of first mounting holes and microwave emitting holes are arranged below the rectangular waveguide; The flange is arranged outside the cylindrical waveguide, and a plurality of second mounting holes are arranged in the circumferential direction of the flange.

[0007] Furthermore, a first annular protrusion and a second annular protrusion are provided on the outer side of the flange, an annular groove is formed between the first annular protrusion and the second annular protrusion, and the height of the second annular protrusion is greater than the height of the second annular protrusion.

[0008] Furthermore, it also includes: an annular gasket, which is arranged in the annular groove.

[0009] Furthermore, the annular gasket is made of stainless steel.

[0010] Furthermore, a chamfer is provided at the contact point between the rectangular section waveguide and the cylindrical section waveguide.

[0011] Furthermore, chamfers are provided at locations where the surfaces of the rectangular waveguide meet.

[0012] Furthermore, the rectangular section waveguide, the cylindrical section waveguide and the flange are made of stainless steel.

[0013] According to the microwave waveguide of the embodiment of the present invention, the microwave efficiency can be increased from about 50% to about 90%.

[0014] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a stereogram according to an embodiment of the present invention; Figure 2 for Figure 1 Bottom view of Figure 3 for Figure 1 Left view of Figure 4 for Figure 3 AA section view Figure 5 for Figure 4 Enlarged view of point A. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to further illustrate the present invention.

[0017] First, combine Figures 1 to 5 The microwave waveguide according to the embodiment of the present invention is described to be used in a microwave drying device, and has a wide range of application scenarios.

[0018] like Figures 1 to 5 As shown, the microwave waveguide according to the embodiment of the present invention comprises: Rectangular section waveguide 1, cylindrical section waveguide 2 and flange 3; The rectangular waveguide 1 and the cylindrical waveguide 2 are connected, the rectangular waveguide 1 can efficiently excite microwaves, and the cylindrical waveguide 2 can efficiently transmit microwaves; The upper and lower surfaces of the rectangular waveguide 1 are planar structures, and the front and rear surfaces are arc structures; A plurality of first mounting holes 11 and microwave emitting holes 12 are arranged below the rectangular waveguide 1. The first mounting holes 11 are used to mount the magnetron, and the microwave emitting holes 12 are used to place the microwave emitting end of the magnetron. The flange 3 is arranged outside the cylindrical waveguide 2, and a plurality of second mounting holes 31 are arranged in the circumferential direction of the flange 3. The flange 3 is used to be mounted on the drying cavity of the microwave drying equipment.

[0019] Further, if Figure 3 , 5 As shown, in this embodiment, a first annular protrusion 32 and a second annular protrusion 33 are provided on the outer side of the flange 3, an annular groove 34 is formed between the first annular protrusion 32 and the second annular protrusion 33, and the height of the second annular protrusion 33 is greater than the height of the second annular protrusion 33; the first annular protrusion 32 is used to insert into the mounting hole on the drying cavity to prevent microwaves from leaking from between the flange 3 and the drying cavity, and the second annular protrusion 33 is used to further block microwaves.

[0020] Furthermore, in this embodiment, it also includes: an annular gasket (not shown in the figure), which is arranged in the annular groove 34 to prevent microwave leakage.

[0021] Furthermore, in the present embodiment, the annular gasket is made of stainless steel, and microwaves are difficult to penetrate annular gaskets made of stainless steel.

[0022] Further, if Figure 1 As shown, in this embodiment, a chamfer is provided at the contact point between the rectangular segment waveguide 1 and the cylindrical segment waveguide 2.

[0023] Further, if Figure 1 As shown, in this embodiment, chamfers are provided at the places where the various surfaces of the rectangular segment waveguide 1 contact each other.

[0024] Furthermore, in this embodiment, the rectangular section waveguide 1, the cylindrical section waveguide 2 and the flange 3 are made of stainless steel.

[0025] Furthermore, in this embodiment, the specific dimensions of the microwave waveguide are simulated and optimized by using COMSOL (full name COMSOL Multiphysics, a powerful general multi-physics simulation software) software dedicated to the microwave industry, so that its efficiency reaches about 90%.

[0026] Working principle: The magnetron emits microwaves, which are excited in the rectangular waveguide 1 and then transmitted to the drying chamber through the cylindrical waveguide 2.

[0027] Above, refer to Figures 1 to 5 The microwave waveguide according to the embodiment of the present invention is described, which can improve the microwave efficiency from the original about 50% to about 90%.

[0028] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0029] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A microwave waveguide, characterized in that: Include: Rectangular section waveguide, cylindrical section waveguide and flange; The rectangular waveguide segment is connected to the cylindrical waveguide segment; The upper and lower surfaces of the rectangular waveguide are planar structures, and the front and rear surfaces are arc structures; A plurality of first mounting holes and microwave emitting holes are arranged below the rectangular waveguide; The flange is arranged outside the cylindrical waveguide, and a plurality of second mounting holes are arranged in the circumferential direction of the flange.

2. The microwave waveguide according to claim 1, characterized in that A first annular protrusion and a second annular protrusion are disposed on the outer side of the flange, an annular groove is formed between the first annular protrusion and the second annular protrusion, and a height of the second annular protrusion is greater than a height of the second annular protrusion.

3. The microwave waveguide according to claim 2, characterized in that It also includes: an annular gasket, which is arranged in the annular groove.

4. The microwave waveguide according to claim 3, characterized in that The annular gasket is made of stainless steel.

5. The microwave waveguide according to claim 1, characterized in that A chamfer is provided at the contact point between the rectangular waveguide segment and the cylindrical waveguide segment.

6. The microwave waveguide according to claim 1, characterized in that Chamfers are provided at locations where the surfaces of the rectangular waveguide meet.

7. The microwave waveguide according to claim 1, characterized in that The rectangular waveguide, the cylindrical waveguide and the flange are made of stainless steel.

Images