CN112897632A

CN112897632A - Microwave treatment equipment

Info

Publication number: CN112897632A
Application number: CN202110295679.1A
Authority: CN
Inventors: 王清源
Original assignee: Chengdu Jihengte Technology Co ltd
Current assignee: Chengdu Jihengte Technology Co ltd
Priority date: 2021-03-19
Filing date: 2021-03-19
Publication date: 2021-06-04

Abstract

The invention discloses a design scheme of microwave treatment equipment, which can feed microwave energy into a longitudinal transmission line in a wide frequency band range through a transverse transmission line and a multistage matching transmission line segment, so that the microwave is transmitted along the longitudinal transmission line and excites an electrodeless lamp tube to generate ultraviolet rays, and the ultraviolet rays irradiate a treated fluid flowing along a medium tube in a cylindrical metal net through the cylindrical metal net and a transparent medium tube. The microwave power leaking into the barrel metal and interacting with the fluid being treated can be suitably controlled. Compared with the common method, the method has better treatment effect and higher energy efficiency. The invention can be applied to the field of sterilization treatment of various gases and liquids, in particular water.

Description

Microwave treatment equipment

Technical Field

The present invention relates to a microwave treatment apparatus. In particular to a microwave treatment device which uses microwave to excite an electrodeless ultraviolet lamp tube to generate ultraviolet rays to treat fluid, particularly water.

Background

In order to treat a fluid, such as harmful gas treatment and sterilization treatment of a liquid such as water, a microwave treatment apparatus has been known in which microwaves coexist and interact with the fluid. This approach has two problems: when a liquid is treated by the heat effect of microwaves, the liquid needs to be heated to a high temperature, which may cause a change in the composition of the object to be heated. For example, water and milk are sterilized, and the liquid is heated to the boiling point. The milk therein is degraded due to high temperature. While non-thermal effects of using microwaves to treat fluids require high power microwaves, resulting in increased microwave treatment costs. On the other hand, heating the fluid to a higher temperature requires a relatively large amount of energy, resulting in a decrease in energy efficiency.

Disclosure of Invention

The invention aims to provide a compact power division network. In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a microwave processing device comprises a longitudinal transmission line with an axis along the Z direction, at least one cylindrical metal net positioned in the longitudinal transmission line, at least one medium tube positioned inside the at least one cylindrical metal net, and at least one lamp tube. The microwave is transmitted along the longitudinal transmission line and lights the lamp tube. The cylindrical metal net and all the lamp tubes are arranged in parallel in the longitudinal transmission line on an XY plane. All the lamp tubes are positioned outside all the cylindrical metal nets. And the fluid substance flows along the medium pipe inside at least one medium pipe. The transparency of the medium tube to the light emitted by the lamp tube is higher than 60%. In a preferred design, only one cylindrical metal net is arranged, a medium pipe is arranged in the cylindrical metal net, and fluid substances flowing along the medium pipe are arranged in the medium pipe. The medium tube can be made of quartz glass and the like, and the higher the transparency of the light emitted by the lamp tube, the better the transparency of the light.

The lamp tube can be supported and fixed in the longitudinal transmission line by adopting a low-dielectric-constant and low-loss dielectric plate perpendicular to the axis of the lamp tube or other modes.

It is necessary to control the interaction of part of the microwaves with the fluid substance and the treatment of the fluid by the light generated by the lamp by controlling the transverse size of the mesh of the cylindrical metal net and the thickness of the mesh wire. In this case, the maximum transverse dimension of the mesh of the tubular metal mesh is less than 50% of the wavelength of free space corresponding to the central frequency of the operating microwave.

In a preferred design, the light generated by the lamp tube is mainly used for treating the fluid, so that the interaction between the microwave and the fluid substance is reduced. In this case, the maximum transverse dimension of the mesh of the tubular metal mesh is less than 10% of the wavelength of free space corresponding to the central frequency of the operating microwave.

The thicker mesh wire of the cylindrical metal net can reduce the interaction between the microwave transmitted into the cylindrical metal net and the fluid substance and also reduce the transmission of the light generated by the lamp tube into the cylindrical metal net. Therefore, it is necessary to form the cylindrical metal net by using net wires with certain thickness. Generally, the maximum cross-sectional dimension of the wires of the tubular metal mesh should be less than 5% of the wavelength of free space corresponding to the center frequency of the operating microwaves. In a preferred design, the maximum cross-sectional dimension of the mesh wire of the cylindrical metal mesh is less than 1% of the wavelength of free space corresponding to the central frequency of the operating microwave.

In order to make the different lamp tubes be excited by the same microwave and make the light of multiple lamp tubes irradiate the fluid substance uniformly as much as possible, the microwave processing equipment is in a mirror symmetry structure relative to an XZ plane and a YZ plane.

Generally, the longitudinal transmission line is a rectangular waveguide. The number of the cylindrical metal nets is 1, the number of the medium tubes positioned in the cylindrical metal nets is 1, and the number of the lamp tubes is 2 or 4. In a preferred design, the number of the lamp tubes is 4.

In order to ensure single-mode transmission of the working microwave in the longitudinal transmission line, the width dimension of the rectangular waveguide is smaller than the wavelength in vacuum corresponding to the central frequency of the working microwave. In a preferred design, the dimension of the wide side of the rectangular waveguide is less than 70% of the wavelength in vacuum corresponding to the center frequency of the operating microwave. The presence of higher order modes that can be transmitted in the longitudinal transmission line may result in different lamps being excited by different microwaves and thus having different luminous intensities, or in the fluid substance flowing through different paths being illuminated non-uniformly by a plurality of lamps.

The lamp tube can be an electrodeless lamp tube. The lamp tube can be lit by microwaves. The light emitted by the lamp tube is ultraviolet light, and the main wavelength is around 254 nm. The transparency of the cylindrical metal net to the light emitted by the lamp tube is more than 60%.

As an important application, the invention is used for the germicidal treatment of water. In this case, the fluid substance is water. The invention can also be used for treating other liquids and gases, such as alcohol, white spirit, industrial waste gas and the like.

In order to improve the utilization efficiency of the light emitted by the lamp tube as much as possible, the inner surface of the longitudinal transmission line can be coated with a reflecting layer with the light reflectivity of more than 60 percent for the light emitted by the lamp tube. In a preferred design, the surface of the mesh wire of the cylindrical metal mesh is also coated with a reflective layer with the light reflectivity exceeding 60% to the light emitted by the lamp tube. In order to obtain the highest utilization efficiency of the lamp tube, the higher the reflectivity of the inner surface of the longitudinal transmission line to light and the higher the reflectivity of the mesh wire surface of the cylindrical metal mesh to light are, the better within a certain cost range.

In order to feed the microwave energy into the longitudinal transmission line, the microwave treatment device further comprises a transverse transmission line with an axis along the Y direction. The transverse transmission line is communicated with the longitudinal transmission line.

In a preferred design, the transverse transmission line is a rectangular waveguide. At least one matched transmission line segment is arranged between the longitudinal transmission line and the transverse transmission line. The axis of the matched transmission line segment is along the Y direction. The matched transmission line segments are all rectangular waveguide segments, and the surfaces of the matched transmission line segments along the-Z direction are flush with the surfaces of the transverse transmission lines along the-Z direction. By the arrangement, all the matched transmission line segments and the transverse transmission line can be integrally processed, and the manufacturing cost can be saved.

The invention has the following beneficial effects:

the invention discloses a design scheme of microwave treatment equipment. The conventional method requires that microwaves flow together with a fluid to be treated and treat the fluid using a heating effect or a non-heating effect of the microwaves. This method heats the fluid, significantly increases the temperature of the fluid, resulting in inefficient use of energy, or requires high power microwaves, resulting in high equipment costs. The invention transmits microwave along a longitudinal transmission line and excites the electrodeless lamp tube to generate ultraviolet rays, the ultraviolet rays irradiate the processed fluid substance flowing along the medium tube in the cylindrical metal mesh through the cylindrical metal mesh and the transparent medium tube, and the microwaves and the processed fluid are properly separated by the cylindrical metal mesh, so that the simple processing of the fluid substance by the ultraviolet rays can be realized, and certain microwaves can participate in the processing of the fluid substance. Compared with the common method, the method has better treatment effect and higher efficiency. The invention can be applied to the sterilization treatment of various gases and liquids, in particular water.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention and example 1

FIG. 2 is a schematic cross-sectional view of example 2

FIG. 3 is a schematic cross-sectional view of example 3

FIG. 4 is a schematic cross-sectional view of example 4 and example 5

FIG. 5 is a schematic cross-sectional view of AA in example 4

FIG. 6 is a schematic cross-sectional view of AA in example 5

FIG. 7 is a schematic cross-sectional view of example 6

FIG. 8 is a schematic cross-sectional view of the AA in example 6

The reference numbers in the drawings correspond to the names: 1-longitudinal transmission line, 2-cylindrical metal net, 3-dielectric tube, 4-fluid substance, 5-lamp tube, 6-transverse transmission line and 61-matching transmission line segment.

Some of the terms specified in this specification are as follows:

the maximum transverse dimension of a mesh, refers to the transverse maximum dimension of the mesh perpendicular to a line of sight when the line of sight passes perpendicularly through the mesh.

Detailed Description

Example 1

As shown in fig. 1.

A microwave processing device comprises a longitudinal transmission line 1 with an axis along the Z direction, a cylindrical metal net 2, a medium tube 3 positioned inside the

cylindrical metal net

2, and 4 lamp tubes 5. The cylindrical metal net 2 and the lamp tube 5 are arranged in parallel in the longitudinal transmission line 1 on the XY plane. Further comprising a fluid substance 4 flowing inside said medium pipe 3 along the axis of said medium pipe 3. The transparency of the medium tube 3 to the light emitted by the lamp tube 5 is higher than 60%. The X, Y and Z directions form a rectangular coordinate system.

The medium tube 3 is made of quartz glass transparent to ultraviolet rays.

The maximum transverse dimension of the mesh of the cylindrical metal net 2 is less than 10% of the wavelength of free space corresponding to the central frequency of the working microwave.

The maximum cross-sectional dimension of the mesh wire of the cylindrical metal mesh 2 is less than 1% of the wavelength of free space corresponding to the central frequency of the working microwave.

The longitudinal transmission line is a rectangular waveguide. The dimension of the wide side of the rectangular waveguide is less than 70% of the wavelength in vacuum corresponding to the center frequency of the working microwave.

The microwave treatment device is mirror symmetric with respect to both the XZ plane and the YZ plane.

The lamp tube 5 is an electrodeless lamp tube. The light emitted by the lamp tube 5 is ultraviolet light. The transparency of the cylindrical metal net 2 to the light emitted by the lamp tube 5 is more than 60%.

The inner surface of the longitudinal transmission line (1) and the mesh line surface of the cylindrical metal mesh 2 are coated with a reflecting layer with the light reflectivity exceeding 60 percent for the light emitted by the lamp tube 5.

Example 2

As shown in fig. 2.

Compared with the embodiment 1, the difference is only that 2 lamp tubes 5 are adopted and distributed on the XZ symmetrical plane of the microwave processing equipment.

Example 3

As shown in fig. 3.

Compared with the embodiment example 1, the difference is only that 2 lamp tubes 5 are distributed on the YZ symmetrical plane of the microwave processing equipment.

Example 4

As shown in fig. 4 and 5.

A microwave treatment device comprises a longitudinal transmission line 1 with an axis along the Z direction, a cylindrical metal net 2, a

medium tube

3 and 4 lamp tubes 5 positioned in the cylindrical metal net 2, and a transverse transmission line 6 communicated with the longitudinal transmission line 1. The cylindrical metal net 2 and the lamp tube 5 are arranged in parallel in the longitudinal transmission line 1 on a plane perpendicular to the Z direction. Further comprising a fluid substance 4 flowing inside said medium pipe 3 along the axis of said medium pipe 3. The transparency of the medium tube 3 to the light emitted by the lamp tube 5 is higher than 60%. The axis of the transverse transmission line 6 is in the Y direction. The cylindrical metal net 2 and the medium pipe 3 positioned in the cylindrical metal net extend out of the longitudinal transmission line 1 from the Z direction. The X, Y and Z directions form a rectangular coordinate system.

The longitudinal transmission line 1 and the transverse transmission line 6 are both rectangular waveguides.

The lamp tube 5 is an electrodeless lamp tube. The light emitted by the lamp tube 5 is ultraviolet light. The transparency of the cylindrical metal net 2 to the light emitted by the lamp tube 5 is more than 80%.

The inner surface of the longitudinal transmission line 1 is coated with a reflective layer having a reflectivity of more than 90% with respect to the light emitted from the lamp tube 5. In a preferred design, the mesh wire surface of the cylindrical metal mesh 2 is also coated with a reflective layer with a reflectivity of more than 90% for the light emitted by the lamp tube 5.

The

longitudinal transmission lines

1 and 4 are distributed in a mirror symmetry mode with respect to the XZ plane and the YZ plane as well as the cylindrical metal net 2.

Example 5

As shown in fig. 4 and 6.

Compared with embodiment 4, the difference is only that 2 matched transmission line segments 61 are arranged between the longitudinal transmission line 1 and the transverse transmission line 6. The longitudinal transmission line 1 interconnects all matching transmission line segments 61 and the transverse transmission line 6. The width dimension of the longitudinal transmission line 1 is less than 70% of the wavelength in vacuum corresponding to the central frequency of the working microwave; the axes of the matched transmission line segments 61 are all along the Z direction. The matching transmission line segments 61 are all rectangular waveguide segments, and the upper surfaces thereof are flush with the upper surface of the longitudinal transmission line 1.

Example 6

As shown in fig. 7 and 8.

Compared with embodiment 4, the difference is only that 2 matched transmission line segments 61 are arranged between the longitudinal transmission line 1 and the transverse transmission line 6. The longitudinal transmission line 1 interconnects all matching transmission line segments 61 and the transverse transmission line 6. The axes of the matched transmission line segments 61 are all along the Y direction, and the matched transmission line segments 61 are all rectangular waveguide segments, and the surfaces of the matched transmission line segments along the-Z direction are flush with the surfaces of the transverse transmission lines 6 along the-Z direction.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. According to the technical spirit of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments within the spirit and principle of the present invention still fall within the protection scope of the technical solution of the present invention. For example, the longitudinal transmission lines may be all square waveguides, circular waveguides, double-ridge waveguides, coaxial lines or elliptical waveguides, etc. The X, Y and Z directions herein constitute a rectangular coordinate system. The X-direction, Y-direction, and Z-direction are referred to herein as any three mutually perpendicular directions, and are provided merely for convenience in explaining the innovative concepts of the present invention. The microwave treatment equipment provided by the invention can be freely and integrally translated and rotated in an actual three-dimensional space, and the innovativeness and the advancement of the microwave treatment equipment are not influenced.

Claims

1. A microwave treatment plant, characterized in that it comprises a longitudinal transmission line (1) with an axis along the Z direction, at least one lamp tube (5) located inside said longitudinal transmission line (1) and at least one tubular metal mesh (2) located inside said longitudinal transmission line (1); at least one medium pipe (3) is arranged in at least one cylindrical metal net (2); the cylindrical metal net (2) and the lamp tube (5) are arranged in parallel on an XY plane; -further comprising a fluid substance (4) flowing along the medium pipe (3) inside at least one of the medium pipes (3); the transparency of the medium tube (3) to the light emitted by the lamp tube (5) is higher than 60%; the X, Y and Z directions form a rectangular coordinate system.

2. A microwave treatment unit according to claim 1, characterized in that the maximum transverse dimension of the mesh openings of the expanded metal cylinder (2) is less than 50% of the wavelength of free space corresponding to the central frequency of the operating microwaves.

3. A microwave treatment unit according to claim 1, characterized in that the maximum transverse dimension of the mesh openings of the expanded metal cylinder (2) is less than 10% of the wavelength of free space corresponding to the central frequency of the operating microwaves.

4. A microwave treatment unit according to claim 1, characterized in that said longitudinal transmission line (1) is a rectangular waveguide; the dimension of the wide side of the rectangular waveguide is less than 70% of the wavelength in vacuum corresponding to the center frequency of the working microwave.

5. A microwave treatment unit according to claim 4, characterized in that the number of said tubular metal meshes (2) is 1 and the number of medium pipes (3) inside each of said tubular metal meshes (2) is 1.

6. A microwave treatment unit as claimed in claim 5, characterized in that said lamps (5) are electrodeless lamps, the number of said lamps (5) being 4.

7. A microwave treatment unit according to claims 2-6, characterized by further comprising at least one transverse transmission line (6) having an axis in the Y-direction; the transverse transmission line (6) is communicated with the longitudinal transmission line (1).

8. A microwave treatment unit as claimed in claim 7, characterized in that said transverse transmission line (6) is a rectangular waveguide; at least one matching transmission line segment (61) is arranged between the longitudinal transmission line (1) and the transverse transmission line (6).

9. A microwave treatment unit as claimed in claim 8, characterized in that the axes of the matching transmission line segments (61) are all in the Y direction.

10. A microwave treatment unit as claimed in claim 9, characterized in that said matching transmission line sections (61) are all rectangular waveguide sections, the surfaces of which in-Z direction are all flush with the surfaces of the transverse transmission lines (6) in-Z direction.