A microwave energy feeding device

Abstract

The embodiment of the present application relates to a microwave energy feeding device, comprising a microwave generator and a microwave dielectric window connected to the outlet end of the microwave generator; the microwave dielectric window comprises a shell having a housing cavity, the shell comprises a cover body close to one side of the microwave generator and a dielectric container connected and fixed to the cover body, and a housing cavity is formed between the cover body and the dielectric container; the microwave dielectric window also comprises a pressure-bearing medium fixed in the housing cavity; the cover body comprises a first through hole corresponding to the outlet end of the microwave generator, and the dielectric container comprises a second through hole corresponding to the first through hole. The microwave energy feeding device of this embodiment can realize normal operation under high temperature and high pressure environment, and the microwave performance is well matched and the microwave loss is low.

Description

Technical Field

[0001] The present invention relates to the field of microwave technology, and more specifically to a microwave energy feeding device. Background Art

[0002] Microwaves refer to electromagnetic waves with a frequency range of 300MHz to 300GHz. Since the 1930s, microwave technology has moved from laboratories to practical applications. During World War II, it achieved rapid development in the military field. After World War II, the research and application of microwave technology gradually transitioned from military needs to the civilian field and has developed rapidly in various industries. At present, scientific research and production have higher practical requirements for microwave reaction devices, especially in terms of high power, high pressure, high temperature, etc., which pose new challenges to traditional microwave reaction devices.

[0003] Microwave high-temperature and high-pressure reaction devices not only need to consider microwave excitation issues, but also need to consider pressure issues under high-pressure environments. Most microwave energy feeding devices in the prior art use rectangular mica sheets or rectangular polytetrafluoroethylene sheets to isolate water vapor. The pressure-bearing capacity of the isolation sheets of this shape and material is weak, and the pressure resistance of the microwave energy feeding part under high-pressure environments cannot be guaranteed. It is easy to cause the isolation sheets to rupture, resulting in gas leakage inside the microwave equipment. At the same time, the leaked gas is easy to impact the microwave source (i.e., microwave generator), causing the microwave source to fail and damage the equipment, which poses a great safety risk. In addition, there are also microwave energy feeding devices in the prior art that use tempered glass as the material of the isolation sheet, which can improve the pressure-bearing capacity of the isolation sheet, but there is also a large microwave loss, which causes the isolation sheet to rise in temperature and be easily damaged, and there are also disadvantages such as poor microwave matching performance.

[0004] Therefore, in order to overcome the defects of the prior art, it is necessary to provide a new type of microwave energy feeding device. Summary of the invention

[0005] The object of the present invention is to provide a microwave energy feeding device, which can realize normal operation in a high temperature and high pressure environment, and at the same time, the microwave energy feeding device has good microwave matching performance and low microwave loss.

[0006] To achieve at least one of the above-mentioned purposes, the present application provides a microwave energy feeding device, comprising a microwave generator and a microwave dielectric window connected to the outlet end of the microwave generator; the microwave dielectric window comprises a shell having a accommodating cavity, the shell comprises a cover body close to one side of the microwave generator and a medium container connected and fixed to the cover body, and an accommodating cavity is formed between the cover body and the medium container; the microwave dielectric window also comprises a pressure-bearing medium fixed in the accommodating cavity; the cover body comprises a first through hole arranged corresponding to the outlet end of the microwave generator; and the medium container comprises a second through hole corresponding to the first through hole.

[0007] In one embodiment, the inner wall of the medium container includes a groove for fixing the pressure-bearing medium, the groove is formed by the inner wall of the medium container being sunken inward, and the surface of the groove is machined with a dense waterline.

[0008] In one embodiment, the microwave dielectric window includes a circular sealing gasket disposed between the groove surface of the medium container and the outer side wall of the pressure medium.

[0009] In one embodiment, the circular sealing gasket is made of polytetrafluoroethylene.

[0010] In one embodiment, the microwave generator includes a magnetron, an excitation cavity connected to the magnetron at one end, and a waveguide, the other end of the excitation cavity is connected and fixed to one end of the waveguide, and the other end of the waveguide is combined and fixed to the edge of the first through hole of the cover body.

[0011] In one embodiment, the length of the waveguide is 100-300 mm.

[0012] In one embodiment, the pressure-bearing medium is made of ceramic, quartz glass, tempered glass, polytetrafluoroethylene or PEEK.

[0013] In one embodiment, the microwave energy feeding device includes an annular sealing gasket disposed between the cover body and the medium container.

[0014] In one embodiment, the annular sealing gasket is made of polytetrafluoroethylene.

[0015] In one embodiment, a surface of one side of the medium container close to the cover body is inwardly recessed to form a first placement groove, and the first placement groove is used to place a first microwave shielding strip;

[0016] The surface of one side of the medium container facing away from the cover body is inwardly recessed to form a second placement groove and a third placement groove;

[0017] The second placement groove is used for placing the second microwave shielding strip;

[0018] The third placement groove is used for placing the sealing ring.

[0019] Beneficial effects of this application

[0020] In view of the technical problems existing in the prior art, the microwave energy feeding device provided by the present application effectively ensures the pressure resistance of the microwave energy feeding device under high pressure environment by setting a microwave dielectric window, prevents airflow leakage, ensures the pressure inside the equipment is stable and the microwave generator is not disturbed, improves the reliability of the microwave energy feeding device, and can increase the use pressure of the microwave energy feeding device to a higher pressure, expands the use range of the microwave energy feeding device, so that the microwave energy feeding device can work normally under high temperature and high pressure environment, such as working normally under 2.5MPa and 200℃; at the same time, the microwave energy feeding device has good microwave matching performance and low microwave loss. Furthermore, the microwave energy feeding device can be installed on the outside of the microwave equipment to avoid occupying the internal space of the microwave equipment, and the microwave dielectric window is easy to replace on site as a modular component, saving equipment maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] Figure 1 A structural cross-sectional view of a microwave energy feeding device according to an embodiment of the present application is shown.

[0023] Figure 2 A front view of a microwave energy feeding device according to an embodiment of the present application is shown.

[0024] Figure 3 A side view of a microwave energy feeding device according to one embodiment of the present application is shown. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0026] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0027] It should also be noted that, in the description of the present application, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the statement "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0028] In view of the technical problems existing in the prior art, an embodiment of the present application provides a microwave energy feeding device 10, such as Figure 1 , Figure 2 and Figure 3As shown, the microwave energy feeding device 10 includes a microwave generator 11 and a microwave dielectric window 12 connected to the outlet end of the microwave generator 11; the microwave generator 11 is used to generate microwaves and feed microwaves into the microwave dielectric window 12. The microwave dielectric window 12 includes a shell having a housing cavity, the shell includes a cover 121 close to one side of the microwave generator 11 and a dielectric container 122 connected and fixed to the cover 121, and a housing cavity is formed between the cover 121 and the dielectric container 122; wherein the cover 121 and the dielectric container 122 are connected and fixed by connecting bolts. The lower end of the dielectric container 122 can be bolted to the connecting flange 20 of other microwave equipment by connecting bolts, so that the microwave generated by the microwave generator 11 is fed into other microwave equipment for microwave processing. In a specific embodiment, the inner diameter of the connecting flange 20 of the other microwave equipment is 97-100 mm, and the length of the connecting flange 20 is 170-250 mm, so as to improve the microwave matching performance of the microwave energy feeding device 10.

[0029] In addition, the microwave dielectric window 12 also includes a pressure-bearing medium 123 fixed in the accommodating cavity, the cover includes a first through hole corresponding to the outlet end of the microwave generator, and the medium container 122 includes a second through hole 1221 corresponding to the first through hole 1211. The microwave generated by the microwave generator 11 enters the microwave dielectric window 12 from the first through hole 1211, passes through the pressure-bearing medium 123, and is then fed into other microwave devices through the second through hole 1221. Figure 1 As shown, the pressure medium 123 is installed at the center of the medium container 122, and the pressure medium 123 is fixed to the bottom wall of the cover body 121, so as to ensure the sealing of the microwave medium window 12, and at the same time ensure that the microwaves generated by the microwave generator 11 are fed into other microwave devices through the pressure medium 123 with low loss, thereby improving the microwave transmission efficiency. The pressure medium 123 can seal the pressure in other microwave devices, improve the sealing strength of the entire microwave energy feeding device 10, and effectively prevent the gas and / or liquid in other microwave devices from leaking from the microwave feeding port into the microwave generator, thereby causing damage to the microwave generator, and at the same time ensure the stability of the working pressure of the microwave equipment, and prevent the sudden change of pressure in the microwave equipment from causing a greater safety risk.

[0030] The microwave energy feeding device 10 of this embodiment seals the pressure in the microwave device by setting the microwave dielectric window 12, effectively ensuring the pressure resistance of the microwave energy feeding device 10 under the high pressure environment inside the microwave device, preventing gas leakage, ensuring the pressure inside the device is stable and the microwave generator 11 is not damaged, improving the reliability of the microwave energy feeding device 10, and increasing the use pressure of the microwave energy feeding device 10 to a higher pressure, expanding the use range of the microwave energy feeding device 10, so that the microwave energy feeding device 10 can work normally in a high temperature and high pressure environment, such as working normally under the working conditions of 2.5MPa and 200°C; at the same time, the microwave matching performance of the microwave energy feeding device 10 is good. Furthermore, the microwave energy feeding device 10 can be installed outside the microwave device to avoid occupying the internal space of the microwave device, and the microwave dielectric window 12 can be designed as a unified standard module, so as to facilitate on-site inspection, maintenance and replacement.

[0031] In a specific embodiment, Figure 1 As shown, a side surface of the medium container close to the cover body is recessed inward to form a first placement groove, and the first placement groove is used to place the first microwave shielding strip 124, that is, the first microwave shielding strip is located between the bottom surface of the cover body 121 and the top surface of the medium container 122. A side surface of the medium container away from the cover body is recessed inward to form a second placement groove and a third placement groove; the second placement groove is used to place the second microwave shielding strip 125, that is, the second microwave shielding strip 125 is located between the bottom surface of the medium container 122 and the top surface of the connecting flange 20. The third placement groove is used to place the sealing ring 30.

[0032] The first microwave shielding strip 124 and the second microwave shielding strip 125 are respectively used to prevent the microwave generated by the microwave generator 11 from leaking from between the bottom surface of the cover 121 and the top surface of the medium container 122 and from between the bottom surface of the medium container 122 and the top surface of the connection flange 20 of the microwave device. The sealing ring 30 is arranged between the bottom surface of the medium container 122 and the top surface of the connection flange 20 of the microwave device to prevent the gas or liquid in the microwave device from leaking from between the bottom surface of the medium container 122 and the top surface of the connection flange 20 of the microwave device.

[0033] In a specific embodiment, the inner wall of the medium container 122 includes a groove 1222 for placing the pressure medium 123. The groove 1222 is formed by the inner wall of the medium container 122 being recessed inwardly. The surface of the groove is machined with a dense waterline. The inner wall of the medium container 122 also includes a step portion 1223 located below the groove 1222. Figure 1As shown, the pressure medium 123 is placed in the groove 1222 of the medium container 122, and a gap of 1-2 mm is left between the outer wall of the pressure medium 123 and the groove 1222 of the medium container 122. The top surface of the step portion 1223 of the medium container 122 fits with the bottom surface of the pressure medium 123, and the top surface of the pressure medium 123 fits with the bottom surface of the cover body 121, so that the pressure medium 123 is accommodated and fixed in the microwave medium window 12. This embodiment further fixes the pressure medium 123, ensures the stability of the pressure medium 123, prevents the pressure medium 123 from shaking during operation, and improves the pressure resistance of the microwave energy feeding device 10 in a high-pressure environment.

[0034] In a specific embodiment, the material of the pressure medium 123 is at least one of ceramic, quartz glass, tempered glass, polytetrafluoroethylene or PEEK. It is understandable that different materials of the pressure medium 123 can be selected according to different technical requirements to ensure the pressure resistance of the pressure medium 123. The material of the pressure medium 123 can be one type of material, or multiple types of materials can be overlapped with each other, and the present application does not impose further restrictions on this. In a further embodiment, the material of the pressure medium 123 is ceramic or quartz glass, and the diameter of the pressure medium 123 is 110-140mm, and the thickness of the pressure medium 123 is 10-50mm. The pressure medium 123 of this embodiment can further improve the pressure resistance of the microwave energy feeding device 10 in a high-pressure environment, and can also improve the microwave matching performance of the microwave energy feeding device 10.

[0035] In a specific embodiment, the microwave dielectric window 12 further includes a circular sealing gasket 126 disposed between the groove surface of the medium container 122 and the outer side wall of the pressure medium 123, specifically, as Figure 1 The circular sealing gasket 126 is respectively arranged between the top surface of the step portion 1223 of the medium container 122 and the bottom wall of the pressure medium 123. The circular sealing gasket 126 can play a force buffering role for the pressure medium 123, ensure that the pressure medium 123 is not damaged, and extend the service life of the pressure medium 123.

[0036] In a specific embodiment, the material of the circular sealing gasket 126 can be at least one of polytetrafluoroethylene and rubber. In a further embodiment, the material of the circular sealing gasket 126 is polytetrafluoroethylene, and the thickness of the circular sealing gasket 126 is 1-3 mm. This embodiment can further improve the sealing performance of the microwave energy feeding device 10 under high temperature and high pressure conditions.

[0037] In a specific embodiment, the microwave energy feeding device 10 includes an annular sealing gasket 127 disposed between the cover 121 and the medium container 122. Figure 1As shown, the annular sealing gasket 127 is arranged between the bottom surface of the cover body 121 and the top surface of the medium container 122. The annular sealing gasket 127 can be used to improve the stress state of the pressure-bearing medium 123, prevent the pressure-bearing medium 123 from shaking during operation, and ensure the stability of the pressure-bearing medium 123.

[0038] In a specific embodiment, the medium container 122, the first microwave shielding strip 124, the cover body 121, the annular sealing gasket 127, the pressure medium 123 and the circular sealing gasket 126 together form the microwave medium window 12. When assembling the microwave medium window 12, firstly place the circular sealing gasket 126 on the inner wall of the medium container 122, then put the pressure medium 123, and then place the pressure medium 123 on the circular sealing gasket 126, and then place the annular sealing gasket 127 on the pressure medium 123, and then place the first microwave shielding strip 124 in the first placement groove on the medium container 122, fit the bottom surface of the cover body 121 with the top surface of the medium container 122, and then connect and fix the cover body 121 and the medium container 122 with connecting bolts, and tighten the connecting bolts to the preset value with a torque wrench, and finally, install the assembled microwave medium window 12 on the test bench to carry out a 1.25 times pressure test.

[0039] In a specific embodiment, the material of the annular sealing gasket 127 may be at least one of polytetrafluoroethylene and rubber. In one example, the material of the annular sealing gasket 127 is a rubber material, and the thickness of the annular sealing gasket 127 is 1-3 mm. This embodiment can further improve the sealing performance of the microwave energy feeding device 10 under high temperature and high pressure conditions, and better match the transmission performance of microwaves.

[0040] In a specific embodiment, the thickness of the pressure medium 123 is lower than the height of the groove 1222, for example, 1-3 mm, the thickness of the annular sealing gasket 127 and the circular sealing gasket 126 is 1-3 mm, and the material of the annular sealing gasket 127 and the circular sealing gasket 126 are both expanded polytetrafluoroethylene, which is compressible. During actual installation, the annular sealing gasket 127 and the circular sealing gasket 126 are compressed and deformed to make up for the height difference between the pressure medium 123 and the groove 122, thereby ensuring that there is no gap between the cover body 121 and the medium container 122, and ensuring that the microwaves generated by the microwave generator 11 will not leak in large quantities from the bottom surface of the cover body 121 and the top surface of the medium container 122.

[0041] In a specific embodiment, the microwave generator 11 includes a magnetron 111, an excitation cavity 112 connected to the magnetron 111 at one end, and a waveguide 113. The other end of the excitation cavity 112 is connected and fixed to one end of the waveguide 113, and the other end of the waveguide 113 is fixed to the edge of the first through hole 1211 of the cover body 121. The excitation cavity 112 is a coaxial waveguide conversion transition device that can effectively transmit the energy generated by the magnetron 111 to the load. The excitation cavity 112 and the waveguide 113 are connected and fixed by connecting bolts. The waveguide 113 is connected and fixed to the edge of the first through hole 1211 of the cover body 121 by connecting bolts. The inner cavity of the waveguide 113 is arranged corresponding to the first through hole 1211 of the cover body 121 to ensure that the microwave generated by the magnetron 111 is directly fed into the microwave dielectric window 12. In a specific embodiment, the length of the waveguide 113 is 100-300 mm, which can effectively reduce the heat inside the microwave device that is conducted along the metal wall to the magnetron, thereby reducing the impact of high temperature on the working state and life of the magnetron.

[0042] It is understandable that the microwave generator 11 also includes a switching power supply (not shown in the figure) for providing high voltage electricity to the magnetron 111 so that the magnetron 111 generates microwaves. At the same time, the microwave generator 11 also includes a sealing sheet (not shown in the figure) disposed between the waveguide 113 and the excitation cavity 112. In a specific embodiment, the sealing sheet is made of polytetrafluoroethylene or mica sheet, and the sealing sheet can be used to achieve sealing between the excitation cavity 112 and the waveguide 113.

[0043] like Figure 1 As shown, when the microwave energy feeding device 10 is assembled on site, the waveguide 113 of the microwave generator 11 is first connected and fixed to the edge of the first through hole 1211 of the cover body 121 of the microwave dielectric window 12 by connecting bolts, and then the excitation cavity 112 is fixed to the waveguide 113 by connecting bolts, and then the magnetron 111 is assembled to the excitation cavity 112 by connecting bolts, and the second microwave shielding strip 125 and the sealing ring 30 are respectively placed in the second placement groove and the third placement groove on the side surface of the dielectric container 122 of the microwave dielectric window 12 away from the cover body, and finally the bottom surface of the microwave dielectric window 12 is fitted with the top surface of the connecting flange 20, and then the microwave dielectric window 12 and the connecting flange 20 are connected and fixed by connecting bolts, and the assembly process of the microwave energy feeding device 10 is completed.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A microwave energy feeding device, characterized in that: include: A microwave generator and a microwave dielectric window connected to an outlet end of the microwave generator; The microwave dielectric window comprises a shell having a containing cavity, wherein the shell comprises a cover body close to one side of the microwave generator and a dielectric container connected and fixed to the cover body, and a containing cavity is formed between the cover body and the dielectric container; The microwave dielectric window also includes a pressure-bearing medium fixed in the accommodating cavity; The cover body comprises a first through hole arranged corresponding to the outlet end of the microwave generator; The medium container includes a second through hole corresponding to the first through hole; The inner wall of the medium container includes a groove for fixing the pressure-bearing medium, the groove is formed by the inner wall of the medium container being sunken inward, and the surface of the groove is machined with a dense waterline; The microwave generator comprises a magnetron, an excitation cavity and a waveguide whose one end is connected to the magnetron, the other end of the excitation cavity is connected and fixed to one end of the waveguide, and the other end of the waveguide is fixed to the edge of the first through hole of the cover body; The length of the waveguide is 100-300 mm; The material of the pressure-bearing medium is ceramic, quartz glass, tempered glass, polytetrafluoroethylene or PEEK; A surface of one side of the medium container close to the cover body is inwardly recessed to form a first placement groove, and the first placement groove is used to place a first microwave shielding strip; The surface of one side of the medium container facing away from the cover body is inwardly recessed to form a second placement groove and a third placement groove; The second placement groove is used for placing the second microwave shielding strip; The third placement groove is used for placing the sealing ring.

2. The microwave energy feeding device according to claim 1, characterized in that: The microwave dielectric window comprises a circular sealing gasket arranged between the groove surface of the dielectric container and the outer side wall of the pressure-bearing medium.

3. The microwave energy feeding device according to claim 2, characterized in that: The circular sealing gasket is made of polytetrafluoroethylene.

4. The microwave energy feeding device according to claim 1, characterized in that: The microwave energy feeding device comprises an annular sealing gasket arranged between the cover body and the medium container.

5. The microwave energy feeding device according to claim 4, characterized in that: The material of the annular sealing gasket is polytetrafluoroethylene.

Images