Uniformly-distributed microwave sterilization system

Abstract

The invention relates to the technical field of microwave sterilization systems, in particular to a uniformly-distributed microwave sterilization system which comprises a conveying channel used for conveying fluid materials. The device further comprises a positioning device, a microwave generator, a waveguide, a horn antenna, a PEI plate and a lens. The microwave generator is communicated with the end part of the waveguide; the two groups of horn antennas are oppositely communicated and arranged at the other end of the waveguide respectively; the conveying channel transversely passes through the opening positions of the two groups of horn antennas; the two groups of PEI plates are respectively arranged between the two groups of horn antenna openings and the conveying channel; the lens is arranged in the two groups of horn antennas through the positioning device; microwaves are gathered or diffused through the lenses in the two groups of horn antennas, and microwave phase distribution at outlets of the horn antennas is actively changed, so that electric field distribution in a conveying channel is directly optimized, cold spots and hot spots are effectively eliminated, sterilization uniformity and efficiency are improved, and meanwhile, convenience of lens replacement operation is improved.

Description

Technical Field

[0001] This invention relates to the technical field of microwave sterilization systems, and in particular to a microwave sterilization system with uniform distribution. Background Technology

[0002] Microwave sterilization technology has shown great potential in the continuous production of food, pharmaceuticals, and liquid materials due to its advantages such as high efficiency, speed, and no pollution. A typical continuous flow microwave sterilization system usually includes a microwave source, a waveguide, a horn antenna, and a processing chamber to contain the material to be processed.

[0003] Currently, a major challenge facing this technology is the uneven distribution of microwave energy within the processing cavity. Due to factors such as the standing wave effect, edge effect, and the dielectric properties of the materials themselves, the electric field within the processing cavity exhibits distinct "hot spots" (high-intensity regions) and "cold spots" (low-intensity regions). This unevenness leads to two serious consequences:

[0004] 1. In order to ensure that the "cold spot" material reaches the minimum sterilization temperature, the overall input power must be increased, which will cause the "hot spot" area to overheat, resulting in a decline in material quality (such as destruction of nutrients and deterioration of flavor).

[0005] 2. If not properly controlled, incomplete sterilization may lead to substandard product quality.

[0006] Existing technologies for improving uniformity include using modal stirrers, rotating cavities, or multi-source feeds. However, modal stirrers are complex in structure and pose a risk of mechanical failure; rotating cavities are unsuitable for large continuous flow systems; and multi-source feeds are costly and have complex control systems. Therefore, there is an urgent need for an electric field homogenization scheme that is simple in structure, highly reliable, and easy to adjust. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a microwave sterilization system that uses lenses within two sets of horn antennas to focus or diffuse microwaves, actively altering the microwave phase distribution at the horn antenna outlet. This directly optimizes the electric field distribution within the delivery channel, effectively eliminating "cold spots" and "hot spots," improving sterilization uniformity and efficiency, achieving different electric field distributions, and simultaneously enhancing the convenience of lens replacement.

[0008] The present invention provides a uniformly distributed microwave sterilization system, including a conveying channel for conveying fluid materials; and also including a positioning device, a microwave generator, a waveguide, a horn antenna, a PEI plate, and a lens.

[0009] The microwave generator is connected and positioned at the end of the waveguide;

[0010] Two sets of horn antennas are respectively connected and positioned opposite each other on the other end of the waveguide, and the transmission channel passes laterally through the openings of the two sets of horn antennas.

[0011] Two sets of PEI boards are respectively positioned between the openings of the two sets of horn antennas and the transmission channel;

[0012] The lenses are positioned inside the two sets of horn antennas via a positioning device, which is used to fix the lenses and allow for quick replacement. Liquid materials flow through the conveying channel, generating microwaves through a microwave generator. These microwaves are guided by waveguides and delivered into the two sets of horn antennas. The microwaves then sterilize the liquid passing through the conveying channel. The lenses within the two sets of horn antennas focus or diffuse the microwaves, actively altering the microwave phase distribution at the antenna outlet. This directly optimizes the electric field distribution within the conveying channel, effectively eliminating "cold spots" and "hot spots," and improving sterilization uniformity and efficiency. The positioning device facilitates the replacement of convex or concave lenses to achieve different electric field distributions, while also improving the convenience of lens replacement. The device has a robust structure, avoiding mechanical failures of equipment such as stirrers, and has low maintenance costs.

[0013] Preferably, the positioning device includes a moving device, a guide rail, a support platform, a positioning hole, a guide ramp, a sleeve, and a pin.

[0014] The guide rail is mounted on the inner wall of the horn antenna;

[0015] The support platform is slidably mounted on the guide rail, and the support platform is provided with mounting holes for the lens;

[0016] The positioning holes are set at corresponding positions on the guide rail and the support platform;

[0017] The guide ramp is set on the side of the support platform;

[0018] The sleeve is installed on the outer wall of the guide rail;

[0019] The pin is slidably positioned inside the sleeve, and the bottom of the pin extends into the positioning hole.

[0020] The moving device is mounted on the sleeve and is used to move the pin upward. The lens is then mounted on the support platform, which is then slidably mounted on the guide rail, so that the lens can be used inside the horn antenna. After the support platform is slidably mounted in place, the pin inserts downward into the positioning hole on the support platform by its own weight, thereby locking the support platform and the guide rail and improving the stability of the lens mounting position. When the lens needs to be replaced, the support platform can be slid out by moving the pin upward through the moving device. By setting a guide slope, the convenience of automatically pushing the pin upward when the support platform is slidably mounted on the guide rail is improved, reducing the complexity of lens loading and unloading for personnel and improving operational convenience.

[0021] If the electric field strength in the edge area of ​​the delivery channel is found to be insufficient during the processing, the convex lens can be replaced with a concave lens. The concave lens will have a diverging effect on the microwave energy flow, directing more energy to the edge area of ​​the processing cavity, thereby balancing the electric field distribution.

[0022] Preferably, the moving device includes an L-shaped component, a lead screw, a connecting block, and a handwheel;

[0023] The L-shaped part is set at the top of the pin part;

[0024] The lead screw is fitted onto the upper part of the sleeve;

[0025] The connecting block is located at the bottom end of the lead screw;

[0026] The handwheel is located at the top of the lead screw. By rotating the handwheel, the operator causes the lead screw to rotate and move upward. The upward movement of the lead screw causes the connecting block to move upward, which in turn causes the connecting block to move the pin upward through the L-shaped part. This facilitates the separation of the pin from the support platform and improves the convenience of sliding and disassembling the support platform.

[0027] Preferably, it also includes a cover plate, a worm gear, a worm, and a motor;

[0028] An opening is provided on the outer wall of the horn antenna, and a cover plate is installed on the opening of the horn antenna, with the side of the cover plate rotatably mounted on the outer wall of the horn antenna.

[0029] The worm gear is mounted on the rotating end of the cover plate;

[0030] The worm gear is rotatably mounted on the outer wall of the horn antenna and meshes with the worm wheel;

[0031] The motor is mounted on the outer wall of the horn antenna and connected to the worm gear. The opening of the horn antenna is sealed by a cover plate, which facilitates the formation of a sealed space inside the horn antenna. When the lens needs to be replaced, the motor drives the worm gear to rotate. After the worm gear rotates, it drives the cover plate to swing and rotate to open the lens, which improves the convenience of lens replacement.

[0032] Preferably, it also includes a cover and a sealing door;

[0033] The enclosure has an operating port. The microwave generator, waveguide, horn antenna, PEI board and conveying channel are all located inside the enclosure, and both ends of the conveying channel extend outside the enclosure.

[0034] The sealed door is located at the operating port of the enclosure; by setting up the enclosure, the protection effect of the microwave sterilization equipment is improved and the radiation leakage is reduced. The sealed door also improves the convenience of lens replacement.

[0035] Preferably, it also includes an internal threaded sleeve, a stud, and a support leg;

[0036] Multiple sets of internal threaded sleeves are installed at the bottom of the cover;

[0037] Multiple sets of studs are respectively screwed onto multiple sets of internal threaded sleeves;

[0038] Multiple sets of support legs are installed at the bottom of multiple sets of studs; by rotating the multiple sets of support legs, the multiple sets of support legs drive the multiple sets of studs to rotate and move, thereby improving the convenience of adjusting the horizontal support of the cover by the multiple sets of support legs.

[0039] Preferably, the lens is made of a low-loss material with a dielectric constant greater than 2 and a dielectric loss tangent less than 0.01, including any one of polyethylene, polypropylene, polytetrafluoroethylene, polyetherimide, or quartz glass.

[0040] Preferably, the horn antenna is equipped with an online electric field probe, which is connected to the control system. The control system collects electric field distribution or temperature field data in real time, and uses an algorithm to determine the uniformity, so as to facilitate the replacement of different lenses according to different uniformities.

[0041] Preferably, the lens is a Fresnel lens; its working principle is the same as that of a convex lens, but it achieves a thin design through a ring-shaped stepped structure, making it particularly suitable for large industrial systems;

[0042] The conveying channel is a planar channel; it is particularly suitable for microwave sterilization of continuous flow liquid materials.

[0043] A microwave sterilization system with uniform distribution, preferably comprising the following methods:

[0044] S1. Allow the fluid material to flow inside the conveying channel, start the microwave generator to generate microwaves, and guide the microwaves through the waveguide to the two sets of horn antennas.

[0045] S2. The microwaves entering the horn antenna are used to perform preliminary sterilization on the fluid materials passing through the conveying channel. At this time, an initial microwave phase distribution is formed at the outlet of the horn antenna, and then a preliminary electric field distribution is formed in the conveying channel.

[0046] S3. Based on the electric field distribution within the conveying channel, if there are "cold spots" and "hot spots," replace the appropriate lens using the positioning device;

[0047] The specific replacement process is as follows: Operate the moving device, which drives the pin to move upward, causing the bottom of the pin to move out of the positioning hole, releasing the lock between the support platform and the guide rail. Then, slide the support platform out along the guide rail, replace the required convex or concave lens, and then slide the support platform back onto the guide rail. During the sliding process, the guide slope on the side of the support platform automatically pushes the pin upward. When the support platform is slid into place, the pin inserts downward into the positioning hole on the support platform by its own gravity, thus relocking the support platform and the guide rail. The replaced lens focuses or diffuses microwaves, actively changing the microwave phase distribution at the horn antenna outlet, thereby optimizing the electric field distribution in the transmission channel and eliminating "cold spots" and "hot spots".

[0048] S4. Continuously use microwaves with optimized electric field distribution to sterilize the fluid material in the conveying channel. At the same time, use an online electric field probe installed in the horn antenna to monitor the electric field strength in the conveying channel in real time. If the electric field strength in the edge area of ​​the conveying channel is found to be insufficient, replace the convex lens with a concave lens through the above positioning device. The concave lens has a diverging effect on the microwave energy flow, directing more energy to the edge area of ​​the conveying channel to further balance the electric field distribution until the sterilization process of the fluid material is completed.

[0049] Compared with the prior art, the beneficial effects of this invention are as follows: the liquid material flows through the inside of the conveying channel, and microwaves are generated by the microwave generator. The microwaves are guided by the waveguide and transported into the two sets of horn antennas. Then, the microwaves sterilize the liquid passing through the conveying channel. The lenses in the two sets of horn antennas focus or diffuse the microwaves, actively changing the microwave phase distribution at the horn antenna outlet, thereby directly optimizing the electric field distribution in the conveying channel, effectively eliminating "cold spots" and "hot spots", improving sterilization uniformity and efficiency. The positioning device facilitates the replacement of different convex or concave lenses to achieve different electric field distributions, while improving the convenience of lens replacement. The device has a robust structure, avoiding mechanical failure problems of equipment such as mode stirrers, and has low maintenance costs. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the isometric structure of the present invention;

[0051] Figure 2 This is an isometric structural diagram of the connection between the microwave generator and waveguide, etc.

[0052] Figure 3 This is a partial isometric structural diagram of the connection between the waveguide and the horn antenna, etc.

[0053] Figure 4 This is a partial isometric structural diagram of the connection between the horn antenna and the guide rail, etc.

[0054] Figure 5This is a partial isometric structural diagram of the connection between the lens and the support platform, etc.

[0055] Figure 6 This is a partial isometric schematic diagram of the support platform and positioning holes, etc.

[0056] Figure 7 This is a partial isometric structural diagram of the connection between the pin and the L-shaped component, etc.

[0057] Figure 8 This is a partial isometric structural diagram of the connection between the horn antenna and the cover plate, etc.

[0058] Figure 9 This is a partial isometric structural diagram of the connection between the worm gear and the motor, etc.

[0059] Figure 10 This is an isometric structural diagram of the connection between the closed door and the internal threaded sleeve, etc.

[0060] The following labels are used in the attached diagram: 101, microwave generator; 102, waveguide; 103, horn antenna; 104, PEI plate; 105, conveying channel; 106, lens; 201, guide rail; 202, support platform; 203, positioning hole; 204, guide slope; 205, sleeve; 206, pin; 301, L-shaped part; 302, lead screw; 303, connecting block; 304, handwheel; 401, cover plate; 402, worm gear; 403, worm; 404, motor; 501, cover; 502, sealing door; 601, internal threaded sleeve; 602, stud; 603, support leg. Detailed Implementation

[0061] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0062] Example 1

[0063] The present invention provides a uniformly distributed microwave sterilization system, including a conveying channel 105 for conveying fluid materials; it also includes a positioning device, a microwave generator 101, a waveguide 102, a horn antenna 103, a PEI plate 104, and a lens 106.

[0064] The microwave generator 101 is connected to the end of the waveguide 102;

[0065] Two sets of horn antennas 103 are respectively connected and positioned opposite each other on the other end of the waveguide 102, and the transmission channel 105 passes laterally through the openings of the two sets of horn antennas 103.

[0066] Two sets of PEI boards 104 are respectively positioned between the openings of the two sets of horn antennas 103 and the transmission channel 105;

[0067] The lens 106 is installed inside the two sets of horn antennas 103 by a positioning device, which is used to fix the lens 106 and quickly replace it.

[0068] The positioning device includes a moving device, a guide rail 201, a support platform 202, a positioning hole 203, a guide inclined surface 204, a sleeve 205, and a pin 206.

[0069] The guide rail 201 is mounted on the inner wall of the horn antenna 103;

[0070] The support platform 202 is slidably mounted on the guide rail 201, and the support platform 202 is provided with mounting holes for the lens 106;

[0071] Positioning holes 203 are provided at corresponding positions on guide rail 201 and support platform 202;

[0072] The guide ramp 204 is provided on the side of the support platform 202;

[0073] Sleeve 205 is mounted on the outer wall of guide rail 201;

[0074] The pin 206 is slidably disposed inside the sleeve 205, and the bottom of the pin 206 extends into the positioning hole 203;

[0075] The moving device is mounted on the sleeve 205 and is used to drive the pin 206 to move upward.

[0076] In this embodiment, liquid material flows through the conveying channel 105, and microwaves are generated by the microwave generator 101. The microwaves are guided by the waveguide 102 and conveyed into the two sets of horn antennas 103. The microwaves then sterilize the liquid passing through the conveying channel 105. The lenses 106 in the two sets of horn antennas 103 focus or diffuse the microwaves, actively changing the microwave phase distribution at the outlet of the horn antennas 103, thereby directly optimizing the electric field distribution in the conveying channel 105, effectively eliminating "cold spots" and "hot spots", and improving sterilization uniformity and efficiency. The positioning device facilitates the replacement of different convex or concave lenses 106 to achieve different electric field distributions, while improving the convenience of lens replacement. The device has a robust structure, avoiding mechanical failure problems of equipment such as mode stirrers, and has low maintenance costs.

[0077] Example 2

[0078] Based on Example 1, the present invention provides a uniformly distributed microwave sterilization system, wherein the moving device includes an L-shaped component 301, a lead screw 302, a connecting block 303, and a handwheel 304.

[0079] L-shaped part 301 is set at the top of pin part 206;

[0080] The lead screw 302 is screwed onto the upper part of the sleeve 205;

[0081] Connecting block 303 is located at the bottom end of lead screw 302;

[0082] Handwheel 304 is located at the top of lead screw 302;

[0083] It also includes a cover plate 401, a worm gear 402, a worm 403, and a motor 404;

[0084] The horn antenna 103 has an opening on its outer side wall, and a cover plate 401 is installed on the opening of the horn antenna 103, and the side of the cover plate 401 is rotatably installed on the outer side wall of the horn antenna 103.

[0085] The worm gear 402 is mounted on the rotating end of the cover plate 401;

[0086] The worm gear 403 is rotatably mounted on the outer wall of the horn antenna 103 and meshes with the worm wheel 402;

[0087] The motor 404 is mounted on the outer wall of the horn antenna 103 and connected to the worm gear 403;

[0088] It also includes a cover 501 and a sealing door 502;

[0089] An operation port is provided on the enclosure 501. The microwave generator 101, waveguide 102, horn antenna 103, PEI board 104 and conveying channel 105 are all located inside the enclosure 501, and both ends of the conveying channel 105 extend outside the enclosure 501.

[0090] The closed door 502 is located at the operating port of the enclosure 501;

[0091] It also includes an internal threaded sleeve 601, a stud 602, and a support leg 603;

[0092] Multiple sets of internal threaded sleeves 601 are all installed at the bottom of the cover 501;

[0093] Multiple sets of studs 602 are respectively screwed onto multiple sets of internal threaded sleeves 601;

[0094] Multiple sets of support legs 603 are respectively installed at the bottom of multiple sets of studs 602;

[0095] The lens 106 is made of a low-loss material with a dielectric constant greater than 2 and a dielectric loss tangent less than 0.01, including any one of polyethylene, polypropylene, polytetrafluoroethylene, polyetherimide or quartz glass.

[0096] An online electric field probe is installed inside the horn antenna 103, and the electric field probe is connected to the control system.

[0097] The lens 106 is a Fresnel lens;

[0098] The conveying channel 105 is a planar channel;

[0099] A microwave sterilization system with uniform distribution includes the following method:

[0100] S1. The fluid material flows inside the conveying channel 105, and the microwave generator 101 is started to generate microwaves. The microwaves are guided and transported to the two sets of horn antennas 103 via waveguide 102.

[0101] S2. The microwave entering the horn antenna 103 is used to perform preliminary sterilization on the fluid material passing through the conveying channel 105. At this time, an initial microwave phase distribution is formed at the outlet of the horn antenna 103, and then a preliminary electric field distribution is formed in the conveying channel 105.

[0102] S3. Based on the electric field distribution within the conveying channel 105, if there are "cold spots" and "hot spots", replace the appropriate lens 106 using the positioning device;

[0103] The specific replacement process is as follows: The moving device moves the pin 206 upwards, causing its bottom to move out of the positioning hole 203, releasing the lock between the support platform 202 and the guide rail 201. Then, the support platform 202 is slid out along the guide rail 201. After replacing the required convex or concave lens, the support platform 202 is slidably reinstalled onto the guide rail 201. During this sliding process, the guide slope 204 on the side of the support platform 202 automatically pushes the pin 206 upwards. Once the support platform 202 is in place, the pin 206, by its own gravity, inserts downwards into the positioning hole 203 on the support platform 202, thus relocking the support platform 202 and the guide rail 201. The replaced lens 106 focuses or diffuses microwaves, actively changing the microwave phase distribution at the exit of the horn antenna 103, thereby optimizing the electric field distribution within the transmission channel 105 and eliminating "cold spots" and "hot spots."

[0104] S4. The microwave with optimized electric field distribution is continuously used to sterilize the fluid material in the conveying channel 105. At the same time, the online electric field probe installed in the horn antenna 103 is used to monitor the electric field strength in the conveying channel 105 in real time. If the electric field strength in the edge area of ​​the conveying channel 105 is found to be insufficient, the convex lens is replaced with a concave lens through the above positioning device. The concave lens plays a diverging role on the microwave energy flow, directing more energy to the edge area of ​​the conveying channel 105 to further balance the electric field distribution until the sterilization process of the fluid material is completed.

[0105] In this embodiment, the lens 106 is mounted on the support platform 202, and then the support platform 202 is slidably mounted on the guide rail 201, so that the lens 106 is used inside the horn antenna 103. After the support platform 202 is slidably mounted in place, the pin 206 is inserted downward into the positioning hole 203 on the support platform 202 by its own gravity, thereby locking the support platform 202 and the guide rail 201 and improving the stability of the lens 106 mounting position. When the lens 106 needs to be replaced, the support platform 202 can be slid out by operating the moving device to drive the pin 206 upward. By setting the guide slope 204, the convenience of automatically pushing the pin 206 upward when the support platform 202 is slidably mounted on the guide rail 201 is improved, reducing the complexity of personnel loading and unloading the lens 106 and improving the ease of operation.

[0106] If the electric field strength in the edge area of ​​the conveying channel 105 is found to be insufficient during the processing, the convex lens can be replaced with a concave lens. The concave lens will have a diverging effect on the microwave energy flow, directing more energy to the edge area of ​​the processing cavity, thereby balancing the electric field distribution. By rotating the handwheel 304, the operator can drive the lead screw 302 to rotate and move upward. The upward movement of the lead screw 302 will drive the connecting block 303 to move upward, and the connecting block 303 will drive the pin 206 to move upward through the L-shaped part 301, which will facilitate the separation of the pin 206 from the support platform 202 and improve the convenience of sliding and disassembling the support platform 202.

[0107] Example 3

[0108] By using a 915MHz microwave sterilization system, the planar water layer channel of its delivery channel 105 has a width of 300mm and a thickness of 81mm, and the horn antenna 103 is sealed to the delivery channel 105 by a PEI plate 104.

[0109] In this embodiment, a plano-convex lens made of polypropylene (ε_r ≈ 2.2, tanδ ≈ 0.0005) is installed inside the horn antenna 103 as a field pattern adjustment lens. This lens can concentrate microwave energy to the central region, compensate for the problem of weak electric field at the center of the processing cavity due to the limited waveguide width, and thus make the electric field more uniformly distributed over a width of 300mm.

[0110] Example 4

[0111] If the electric field strength in the edge region of the delivery channel 105 is found to be insufficient during the processing, the convex lens in Example 3 can be replaced with a concave lens. The concave lens will have a diverging effect on the microwave energy flow, directing more energy to the edge region of the processing cavity, thereby balancing the electric field distribution.

[0112] Example 5

[0113] To reduce lens weight and material consumption, lens 106 can be designed as a Fresnel lens, which works on the same principle as a convex lens, but achieves a thinner design through a ring-shaped stepped structure, making it particularly suitable for large industrial systems.

[0114] like Figures 1 to 10 As shown, the present invention provides a uniformly distributed microwave sterilization system. During operation, liquid material flows through the inside of the conveying channel 105, and microwaves are generated by the microwave generator 101. The microwaves are guided by the waveguide 102 and conveyed into the two sets of horn antennas 103. Then, the microwaves sterilize the liquid passing through the conveying channel 105.

[0115] The main functions achieved by this invention are:

[0116] 1. Lens 106 focuses or diffuses microwaves, actively changing the microwave phase distribution at the exit of horn antenna 103, thereby directly optimizing the electric field distribution in the delivery channel 105, effectively eliminating "cold spots" and "hot spots", and improving sterilization uniformity and efficiency.

[0117] 2. By replacing the lens 106 with different convex or concave lenses, different electric field distributions can be achieved, while improving the convenience of lens 106 replacement operations.

[0118] The microwave generator 101 of the uniformly distributed microwave sterilization system of the present invention is commercially available. Technical personnel in the industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0119] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A uniformly distributed microwave sterilization system, comprising a conveying channel (105) for conveying fluid materials; characterized in that, It also includes a positioning device, a microwave generator (101), a waveguide (102), a horn antenna (103), a PEI plate (104), and a lens (106). The microwave generator (101) is connected to the end of the waveguide (102); Two sets of horn antennas (103) are respectively connected to each other on the other end of the waveguide (102), and the transmission channel (105) passes laterally through the opening of the two sets of horn antennas (103); Two sets of PEI boards (104) are respectively set between the openings of the two sets of horn antennas (103) and the transmission channel (105); The lens (106) is set inside the two sets of horn antennas (103) by a positioning device, which is used to fix the lens (106) and quickly replace it.

2. The microwave sterilization system with uniform distribution as described in claim 1, characterized in that, The positioning device includes a moving device, a guide rail (201), a support platform (202), a positioning hole (203), a guide slope (204), a sleeve (205), and a pin (206). The guide rail (201) is set on the inner wall of the horn antenna (103); The support platform (202) is slidably mounted on the guide rail (201), and the support platform (202) is provided with mounting holes for the lens (106); The positioning holes (203) are set at corresponding positions on the guide rail (201) and the support platform (202); The guide ramp (204) is provided on the side of the support platform (202); The sleeve (205) is installed on the outer wall of the guide rail (201); The pin (206) is slidably disposed inside the sleeve (205), and the bottom of the pin (206) extends into the positioning hole (203); The moving device is mounted on the sleeve (205) and is used to drive the pin (206) to move upward.

3. The microwave sterilization system with uniform distribution as described in claim 2, characterized in that, The moving device includes an L-shaped component (301), a lead screw (302), a connecting block (303), and a handwheel (304). The L-shaped part (301) is set at the top of the pin part (206); The lead screw (302) is screwed onto the upper part of the sleeve (205); The connecting block (303) is located at the bottom end of the lead screw (302); The handwheel (304) is located at the top of the lead screw (302).

4. The microwave sterilization system with uniform distribution as described in claim 1, characterized in that, It also includes a cover plate (401), a worm gear (402), a worm (403), and a motor (404). An opening is provided on the outer wall of the horn antenna (103), and a cover plate (401) is installed on the opening of the horn antenna (103), and the side of the cover plate (401) is rotated and installed on the outer wall of the horn antenna (103). The worm gear (402) is mounted on the rotating end of the cover plate (401); The worm (403) is rotatably mounted on the outer wall of the horn antenna (103) and meshes with the worm wheel (402); The motor (404) is mounted on the outer wall of the horn antenna (103) and connected to the worm (403).

5. The microwave sterilization system with uniform distribution as described in claim 1, characterized in that, It also includes a cover (501) and a sealing door (502); An operation port is provided on the enclosure (501). The microwave generator (101), waveguide (102), horn antenna (103), PEI board (104) and transmission channel (105) are all located inside the enclosure (501), and the two ends of the transmission channel (105) extend outside the enclosure (501). The closed door (502) is located at the operating port of the cover (501).

6. The microwave sterilization system with uniform distribution as described in claim 5, characterized in that, It also includes an internal threaded sleeve (601), a stud (602), and a support leg (603); Multiple sets of internal threaded sleeves (601) are all installed at the bottom of the cover (501); Multiple sets of studs (602) are respectively screwed onto multiple sets of internal threaded sleeves (601); Multiple sets of support legs (603) are respectively installed at the bottom of multiple sets of studs (602).

7. The microwave sterilization system with uniform distribution as described in claim 1, characterized in that, The lens (106) is made of a low-loss material with a dielectric constant greater than 2 and a dielectric loss tangent less than 0.01, including any one of polyethylene, polypropylene, polytetrafluoroethylene, polyetherimide or quartz glass.

8. The microwave sterilization system with uniform distribution as described in claim 1, characterized in that, An online electric field probe is installed inside the horn antenna (103), and the electric field probe is connected to the control system.

9. The microwave sterilization system with uniform distribution as described in claim 1, characterized in that, The lens (106) is a Fresnel lens; The conveying channel (105) is a planar channel.

10. The microwave sterilization system with uniform distribution as described in claim 1, characterized in that, Including the following methods: S1. Make the fluid material flow inside the conveying channel (105), start the microwave generator (101) to generate microwaves, and guide the microwaves through the waveguide (102) to the two sets of horn antennas (103); S2. The microwave entering the horn antenna (103) is used to perform preliminary sterilization on the fluid material passing through the conveying channel (105). At this time, an initial microwave phase distribution is formed at the outlet of the horn antenna (103), and then a preliminary electric field distribution is formed in the conveying channel (105). S3. According to the electric field distribution in the conveying channel (105), if there are "cold spots" and "hot spots", replace the appropriate lens (106) through the positioning device. The specific replacement process is as follows: Operate the moving device, which drives the pin (206) to move upward, so that the bottom of the pin (206) moves out of the positioning hole (203), releasing the lock between the support platform (202) and the guide rail (201). Then, slide the support platform (202) out along the guide rail (201), replace the required convex or concave lens, and then slide the support platform (202) back onto the guide rail (201). During the sliding process, the guide slope (204) on the side of the support platform (202) moves from... The pin (206) is pushed upwards. After the support platform (202) is slidably installed in place, the pin (206) is inserted downwards into the positioning hole (203) on the support platform (202) by its own gravity, thereby relocking the support platform (202) and the guide rail (201). The replaced lens (106) focuses or diffuses the microwaves, actively changing the microwave phase distribution at the exit of the horn antenna (103), thereby optimizing the electric field distribution in the transmission channel (105) and eliminating "cold spots" and "hot spots". S4. The microwave with optimized electric field distribution is continuously used to sterilize the fluid material in the conveying channel (105). At the same time, the online electric field probe installed in the horn antenna (103) is used to monitor the electric field strength in the conveying channel (105) in real time. If the electric field strength in the edge area of ​​the conveying channel (105) is found to be insufficient, the convex lens is replaced with a concave lens through the above positioning device. The concave lens plays a diverging role on the microwave energy flow, directing more energy to the edge area of ​​the conveying channel (105) to further balance the electric field distribution until the sterilization process of the fluid material is completed.

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