Electrodeless UV sterilizer for sewage treatment plants

Abstract

The present invention relates to the field of microwave application, and solves the problem that sewage treatment plants cannot effectively sterilize in the prior art. The present invention is an electrodeless ultraviolet sterilization device for sewage treatment plants, including an electrodeless ultraviolet sterilization device and an automatic control device; the electrodeless ultraviolet sterilization device includes a microwave generator and an electrodeless ultraviolet lamp, and the microwave generator is coupled to the electrodeless ultraviolet lamp through a waveguide system; the wide wall of the waveguide system is provided with a hole structure and a resonant cavity; the hole structure penetrates the electrodeless ultraviolet lamp through the resonant cavity. The present invention eliminates the need to clean, seal, and dissipate heat for the quartz tube during the use of the ultraviolet sterilization system of the sewage treatment plant, and the various disadvantages of being easy to damage and difficult to repair and maintain. The lamp has good heat dissipation, which improves the utilization efficiency of ultraviolet light; the lamp is easier to replace and clean; and has strong scalability; the relationship between the ultraviolet light intensity and the power of the magnetron is set by the automatic control device to adjust the sterilization efficiency.

Description

Technical Field

[0001] The invention relates to the field of microwave application, in particular to an electrodeless ultraviolet sterilization device used in a sewage treatment plant. Background Art

[0002] There are problems with water purification in production and life, and ultraviolet sterilization has become one of the most commonly used sterilization methods;

[0003] The treatment of domestic and industrial sewage is closely related to our lives.

[0004] Various electrodeless ultraviolet lamps and electrodeless ultraviolet sterilization devices were produced. Traditional microwave electrodeless ultraviolet lamps mostly place all lamps in a microwave energy resonant cavity with ventilation mesh holes, and use waveguides to transmit electromagnetic waves to excite the lamps and light them up. Although very little microwave energy is radiated in this cavity, it can provide sufficient electromagnetic energy for the electrodeless lamps. However, the design of the lamp mesh structure greatly blocks the propagation of ultraviolet light, affecting the efficiency of ultraviolet light. In addition, this cavity structure must be fully waterproof, which greatly increases the difficulty of design.

[0005] And because the sealing problem also involves the design of the heat dissipation of the lamp tube, it increases the difficulty involved. During use, it is not only large in size but also prone to malfunctions due to heat dissipation problems.

[0006] There is an urgent need for an effective ultraviolet sterilization device that can effectively sterilize. Summary of the invention

[0007] The present invention provides an electrodeless ultraviolet sterilization device for a sewage treatment plant, which solves the problem in the prior art that the sewage treatment plant cannot effectively sterilize.

[0008] The technical solution of the present invention is implemented as follows: an electrodeless ultraviolet sterilization device for a sewage treatment plant comprises: an electrodeless ultraviolet sterilization device and an automatic control device; the electrodeless ultraviolet sterilization device comprises a microwave generator and an electrodeless ultraviolet lamp, the microwave generator is coupled to the electrodeless ultraviolet lamp through a waveguide system; the wide wall of the waveguide system is provided with a hole structure and a resonant cavity; the hole structure penetrates the electrodeless ultraviolet lamp through the resonant cavity.

[0009] Furthermore, the aperture is arranged at the antinode of the wide-wall standing wave of the waveguide system; the aperture width increases with the distance from the rectangular waveguide waveport entrance; the aperture length is greater than half a wavelength; the resonant cavity is a cylindrical metal cavity, and the height of the resonant cavity is greater than half a wavelength.

[0010] Furthermore, there are at least two lamp tubes, which are arranged in parallel and respectively penetrate the waveguide system; and there is one waveguide wavelength between the lamp tubes.

[0011] Preferably, it also includes an ultraviolet light intensity sensor and a flow meter, and the ultraviolet light sensor and flow meter are connected to the automatic control device; the storage module also includes a power storage unit that characterizes the relationship between the magnetron power and the ultraviolet light intensity, and a flow storage unit that characterizes the relationship between the ultraviolet light intensity and the water flow.

[0012] Furthermore, the electrodeless ultraviolet sterilization device includes a magnetron and an ultraviolet lamp, the magnetron includes a power adjustment device, and the power adjustment device is connected to an automatic control device.

[0013] Preferably, the waveguide system comprises an expandable portion connecting waveguide sections having resonant cavities.

[0014] The present invention discloses an electrodeless ultraviolet sterilization device for a sewage treatment plant, and discloses a novel electrodeless ultraviolet lamp. The outer quartz tube does not need to be waterproofed, the lamp tube has good heat dissipation, the workload of designing a treatment water channel is reduced, and the utilization efficiency of ultraviolet light is improved; the lamp tube is easier to replace and clean; the extensibility is strong, and if a higher ultraviolet light intensity is required, multiple groups of lamp tubes can be spliced ​​and used at the same time; the relationship between the ultraviolet light intensity and the magnetron power is set by an automatic control device to adjust the sterilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 : A schematic diagram of the structure of the present invention;

[0017] Figure 2 : Simulation diagram of coupling electric field strength of the present invention;

[0018] Figure 3 : Engineering simulation diagram.

[0019] Among them: 1. Magnetron; 2. Waveguide system; 3. Electrodeless UV lamp tube; 4. Hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1 As described in the structural schematic diagram of the present invention, the electrodeless ultraviolet sterilization device for a sewage treatment plant disclosed in the present invention includes: an electrodeless ultraviolet sterilization device and an automatic control device; the electrodeless ultraviolet sterilization device includes a microwave generating device and an electrodeless ultraviolet lamp tube 3, the microwave generating device is coupled to the electrodeless ultraviolet lamp tube 3 through a waveguide system 2, and the waveguide systems 2 are not less than two; the wide wall of the waveguide system 2 is provided with a hole 4 structure; the hole 4 structure penetrates the electrodeless ultraviolet lamp tube 3 through a resonance cavity.

[0022] Furthermore, the wide wall of the waveguide system 2 is provided with a hole 4 structure and a resonant cavity; the microwave energy is coupled into the microwave resonant cavity through the hole 4 structure on the waveguide, and the electrodeless ultraviolet lamp tube 3 runs through the microwave resonant cavity. . The present invention adopts a single-mode rectangular waveguide, and the single-mode TE10 mode is transmitted in the waveguide. According to the hole 4 coupling and crack antenna theory, when the hole 4 opened on the wide wall of the rectangular waveguide is located at the position of the maximum surface current of the rectangular waveguide, the current flow is affected because its current line is cut off, thereby destroying the field distribution of the waveguide, and causing radiation and reflection in the waveguide. Through the hole 4 and the microwave resonant cavity, the electromagnetic wave energy is coupled from the hole 4 to the microwave resonant cavity, and the microwave energy acts on the local position of the lamp tube by acting on the electromagnetic field, so that the microwave energy acts on part of the lamp tube with high efficiency. When the microwave energy is sufficient, the electrodeless ultraviolet lamp tube 3 is locally subjected to a strong electromagnetic field, and the lamp tube filling material at this position and near this position will be excited to a plasma state, and the lamp tube is simultaneously acted on by multiple groups of waveguide systems 2, which excites and lights up the electrodeless ultraviolet lamp tube 3.

[0023] Preferably, the aperture 4 is arranged at the antinode of the wide wall standing wave of the waveguide system 2; the width of the aperture 4 increases with the distance from the feed port of the waveguide system 2; and the length of the aperture 4 is greater than half a wavelength.

[0024] The energy coupling in the cavity of the waveguide system 2 is controlled by controlling the position and size of the aperture 4 of the waveguide system 2. Opening the aperture at the antinode of the standing wave helps to couple the energy into the microwave resonant cavity. The length of the aperture 4 should be greater than half the waveguide wavelength. The length and width of the aperture 4 are equivalent to the capacitance and inductance in the distributed parameters of the transmission line circuit. The size and position of the aperture 4 are determined by the distributed parameter matching calculation and parametric scanning method. The distance between two apertures 4 should be one waveguide wavelength.

[0025] The present invention adopts a rectangular waveguide, and designs a single coupling cavity by opening a slit on the wide side of the rectangular waveguide to achieve hole-slit 4 coupling, so that energy enters the resonant cavity from the main waveguide. The volume of the coupling cavity is optimized by scanning parameters through software;

[0026] On this basis, the position and width of the slits are optimized through software to achieve uniform coupling of electromagnetic wave energy in each pore.

[0027] When the electromagnetic wave is transmitted in the waveguide, after passing through the first aperture 4, the total power is attenuated by -6dB. By analogy, the energy coupled into each aperture 4 is -6dB of the total power. The attenuated power is coupled to the microwave resonant cavity through the aperture 4 to excite the lamp tube, and the electromagnetic wave energy of each aperture 4 is uniformly coupled. Of course, the size of the aperture 4 is different according to the distance from the rectangular waveguide feed port. Only by changing the size of the aperture 4 can the electromagnetic wave energy of each aperture 4 be uniformly coupled.

[0028] like Figure 2 As shown in the simulation diagram of the coupling electric field strength of the present invention, each rectangular waveguide has four holes 4, three rectangular waveguides have a total of 12 holes 4, and a total of four lamp tubes, each lamp tube is connected to a cylindrical metal cavity on four holes 4, namely a microwave resonant cavity.

[0029] The present invention also includes an ultraviolet light intensity sensor and a flow meter, which are connected to an automatic control device; the storage module also includes a power storage unit that characterizes the relationship between the power of the magnetron 1 and the ultraviolet light intensity, and a flow storage unit that characterizes the relationship between the ultraviolet light intensity and the water flow.

[0030] Furthermore, the electrodeless ultraviolet sterilization device includes a magnetron 1 and an ultraviolet lamp, and the magnetron 1 includes a power adjustment device, and the power adjustment device is connected to an automatic control device.

[0031] Preferably, the waveguide system 2 comprises an expandable portion, the expandable portion is connected to a waveguide section having a resonant cavity, and the expandable portion determines the position and width of a slit through simulation to achieve uniform coupling of magnetic wave energy.

[0032] like Figure 3 Simulating actual engineering applications, the lamp tube in this embodiment is one meter long, and the range of each waveguide system 2 that can light up is 30cm, so three waveguide systems 2 are set. During use, the outermost largest rectangular parallelepiped is a sewage treatment plant, in which sewage flows, and the lamp tube is vertically framed in the sewage treatment plant to form a lamp tube network structure. When sewage flows through the electrodeless ultraviolet lamp tube 3 network structure, the sewage is sterilized. Preferably, the ultraviolet light intensity sensor arranged outside the ultraviolet lamp tube senses the ultraviolet light intensity, and adjusts the ultraviolet light intensity through the flow storage unit that characterizes the relationship between the ultraviolet light intensity and the water flow and the power storage unit that characterizes the relationship between the power of the magnetron 1 and the ultraviolet light intensity, so as to achieve the matching of the ultraviolet light intensity and the water flow under the premise of ensuring the sterilization efficiency, and avoid the waste of resources caused by excessive power, and the damage of the micro-wave generating device and the ultraviolet lamp tube.

[0033] Compared with the traditional ultraviolet water treatment device, this device gets rid of the constraint of waveguide on the electrodeless ultraviolet lamp tube 3, and is more convenient to install and disassemble, and it is also more convenient to disassemble and wash; the waterproof treatment of the outer quartz tube is omitted, which can improve the utilization efficiency of ultraviolet light; this electrodeless lamp structure has more applicable environments and can be directly put into water for use. Compared with the previous design, the workload of water treatment channel design is reduced; the electrodeless ultraviolet lamp tube 3 is easier to replace and clean; it has strong scalability, and if higher ultraviolet light intensity is required, multiple groups of lamp tubes can be spliced ​​and used at the same time; the energy utilization efficiency is improved, and the energy from electricity to microwaves and the energy from microwaves to ultraviolet rays are both improved; the lamp tube has good heat dissipation, and if used underwater, there is no need to consider the heat dissipation problem of the lamp tube.

[0034] Of course, without departing from the spirit and essence of the invention, technicians familiar with the field should be able to make various corresponding changes and modifications based on the invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the invention.

Claims

1. The electrodeless ultraviolet sterilization device used in sewage treatment plants is characterized by: include: Stepless ultraviolet sterilization device, automatic control device; The electrodeless ultraviolet sterilization device comprises a microwave generator and an electrodeless ultraviolet lamp, wherein the microwave generator is coupled to the electrodeless ultraviolet lamp through a waveguide system; a hole structure and a resonance cavity are arranged on a wide wall of the waveguide system; and the hole structure penetrates the electrodeless ultraviolet lamp through the resonance cavity; The aperture is arranged at the antinode of the wide wall standing wave of the waveguide system; the width of the aperture increases with the distance from the feed port of the waveguide system; the length of the aperture is greater than half a wavelength; The resonant cavity is a cylindrical metal cavity, and the height of the resonant cavity is greater than half a wavelength; There are at least two lamp tubes, which are arranged in parallel and respectively penetrate the waveguide system; There is one waveguide wavelength between the lamp tubes.

2. The electrodeless ultraviolet sterilization device for a sewage treatment plant according to claim 1 is characterized in that: It also includes an ultraviolet light intensity sensor and a flow meter, wherein the ultraviolet light sensor and the flow meter are connected to the automatic control device; The storage module also includes a power storage unit for characterizing the relationship between the magnetron power and the ultraviolet light intensity, and a flow storage unit for characterizing the relationship between the ultraviolet light intensity and the water flow.

3. The electrodeless ultraviolet sterilization device for a sewage treatment plant according to claim 2 is characterized in that: The electrodeless ultraviolet sterilization device comprises a magnetron and an ultraviolet lamp. The magnetron comprises a power adjustment device, and the power adjustment device is connected to an automatic control device.

4. The electrodeless ultraviolet sterilization device for a sewage treatment plant according to claim 3 is characterized in that: The waveguide system includes an expandable portion connecting waveguide sections having a resonant cavity.

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