Sewage treatment device based on vacuum evaporation

Abstract

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment device based on vacuum evaporation, which comprises an evaporation box, a water supply pump, a compression pump, a water purification box, a water storage box, a water pumping pipe, a drainage head, a guide plate, a transmission box, a console, a circulating mechanism, an adjusting mechanism and a regulation and control mechanism. Heat of compressed purified water can be recycled from sewage through the circulating mechanism, the sewage flowing on the flow guide plate can be efficiently evaporated conveniently, part of devices can adjust the flowing area of the liquid curtain according to the sewage concentration through the adjusting mechanism, and therefore the evaporation time of the flowing liquid curtain is adjusted, and the evaporation efficiency is improved. Through the regulation and control mechanism, part of the device can regulate the thickness of the water outlet liquid curtain according to the sewage concentration, so that the circulating sewage can be conveniently concentrated to the preset concentration, and the high efficiency, the regulation and the regulation and control performance of the device are improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a wastewater treatment device based on vacuum evaporation. Background Technology

[0002] With industrial development and resource exploitation, water pollution has become increasingly serious. Wastewater treatment is widely used in various fields, requiring wastewater to meet discharge or reuse standards to protect water resources and the ecological environment, and to meet the water quality requirements of different industries. Vacuum evaporation refers to the process of lowering the boiling point of a liquid by reducing the system pressure under vacuum conditions below atmospheric pressure, allowing the liquid to evaporate at low temperatures, which can effectively reduce energy consumption.

[0003] Existing devices primarily use a vacuum pump in conjunction with an evaporation tank to concentrate wastewater. Many existing technologies resemble wastewater treatment devices and methods based on vacuum evaporation. For example, the structure disclosed in CN114656004A includes a base plate and a discharge mechanism to discharge impurities evaporated within the evaporation tank while maintaining a vacuum, thus reducing heat loss. A collection mechanism is located at the bottom left side of the evaporation tank to collect the impurities discharged by the discharge mechanism. This device can effectively remove impurities from wastewater while maintaining a vacuum within the evaporation tank, and it also effectively reduces heat loss during the discharge process. However, there are still areas for improvement in this device.

[0004] Existing devices mainly extract pure water using a vacuum pump and condenser. This makes the purification components of some devices complex and wastes a lot of heat energy. Furthermore, some devices struggle to drive wastewater circulation to the guide plate for flow evaporation, making it difficult to recover the heat from compressing the pure water. Secondly, the wastewater evaporation area of ​​some devices depends on the water surface area inside the evaporation tank, making it difficult to adjust the flow area of ​​the liquid curtain based on the wastewater concentration. This makes it difficult to control the evaporation time of the flowing liquid curtain. Finally, some devices struggle to adjust the thickness of the effluent liquid curtain based on the wastewater concentration, making it difficult to concentrate the circulating wastewater to a predetermined concentration, thus reducing the device's efficiency and practicality. Therefore, to solve the above problems, a wastewater treatment device based on vacuum evaporation is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a wastewater treatment device based on vacuum evaporation, which solves the problems mentioned in the background art. Firstly, existing devices in the prior art are difficult to drive wastewater circulation to the guide plate for flow evaporation, making it inconvenient to recover the heat from compressing pure water. Secondly, the wastewater evaporation area of ​​some devices depends on the water surface area inside the evaporation tank, making it difficult to adjust the flow area of ​​the liquid curtain according to the wastewater concentration, thus making it difficult to control the evaporation time of the flowing liquid curtain. Finally, some devices are difficult to adjust the thickness of the effluent liquid curtain according to the wastewater concentration, making it difficult to concentrate the circulating wastewater to a predetermined concentration.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wastewater treatment device based on vacuum evaporation, comprising an evaporation box, a wastewater tank fixedly connected to the left side of the evaporation box, a water supply pump fixedly connected to the top of the wastewater tank, a drain pipe of the water supply pump placed inside the left side of the evaporation box, a compressor pump fixedly connected to the top center of the evaporation box, and a clean water tank fixedly connected to the right side of the evaporation box. A water storage tank is fixedly connected to the upper right side wall of the evaporator, a water pumping pipe is fixedly connected to the middle bottom of the water storage tank, a drain head is fixedly connected to the middle left side of the water storage tank, a guide plate is movably connected to the inner wall of the evaporator below the drain head, a transmission box is fixedly connected to the upper left side wall of the evaporator, and a control console is fixedly connected to the middle front side of the evaporator. The water storage tank is equipped with a circulation mechanism, which includes a first motor. The bottom of the first motor is fixedly connected to the middle of the top of the water storage tank. The transmission box is equipped with an adjustment mechanism, which includes a second motor. The rear side of the second motor is fixedly connected to the front side of the transmission box. The drain head is equipped with a control mechanism.

[0007] Preferably, a rotating rod is fixedly connected to the bottom center of the first motor, the bottom end of the rotating rod passes through the water storage tank and is movably connected to the bottom of the inner wall of the pumping pipe, and an auger blade is fixedly connected to the lower outer wall of the rotating rod.

[0008] Preferably, the inner wall of the water storage tank is provided with a heat exchange pipe, the inlet end of the heat exchange pipe passes through the water storage tank and is fixedly connected to the middle right side of the compressor pump, and the outlet end of the heat exchange pipe passes through the water storage tank and is fixedly connected to the top left side of the clean water tank.

[0009] Preferably, a transmission worm is fixedly connected to the middle of the rear side of the second motor, the rear end of the transmission worm is movably connected to the rear side of the inner wall of the transmission box, a transmission worm wheel is meshed with the lower outer wall of the transmission worm, a transmission screw is fixedly connected to the inner wall of the transmission worm wheel, and the left end of the transmission screw is movably connected to the left side of the inner wall of the transmission box.

[0010] Preferably, a pusher cylinder is threaded on the right side of the outer wall of the transmission screw, and a pusher rod is fixedly connected to the right end of the pusher cylinder. The right end of the pusher rod passes through the transmission box and is fixedly connected to a sliding frame. A limiting sleeve is fitted on the middle of the outer wall of the sliding frame, and the front and rear ends of the limiting sleeve are fixedly connected to the upper inner wall of the evaporator.

[0011] Preferably, a traction rod is movably connected to the left side of the sliding frame, the bottom end of the traction rod is movably connected to the top left side of the guide plate, an extension plate is inserted into the lower inner wall of the guide plate, pulleys are movably connected to the lower two sides of the extension plate, a slide rail is provided on the left side of the outer wall of the pulley, and the left side of the slide rail is fixedly connected to the left side of the inner wall of the evaporator.

[0012] Preferably, a telescopic rod is fixedly connected to the right side of the extension plate, the right end of the telescopic rod is fixedly connected to the bottom right side of the guide plate, and a compression spring is fixedly connected to the right side of the extension plate on the outer ring of the telescopic rod, the right end of the compression spring is fixedly connected to the bottom right side of the guide plate.

[0013] Preferably, the control mechanism includes a push plate, the left end of which is fixedly connected to the middle right side of the sliding frame, the right end of which passes through the left side wall of the drain head and is fixedly connected to a wedge-shaped pressure strip, and a lifting valve strip is slidably attached to the right side wall of the wedge-shaped pressure strip.

[0014] Preferably, telescopic cylinders are fixedly connected to the top two sides of the lifting valve strip, and a fixing frame is fixedly connected to the top of the telescopic cylinder. The front and rear ends of the fixing frame are fixedly connected to the middle of the inner wall of the drain head. A return spring is fixedly connected to the top of the lifting valve strip on the outer ring of the telescopic cylinder, and the top of the return spring is fixedly connected to the bottom two sides of the fixing frame.

[0015] Preferably, a fixed valve strip is provided on the right side of the lifting valve strip, and the right side of the fixed valve strip is fixedly connected to the right side of the inner wall of the drain head. The right slope of the lifting valve strip can be tightly fitted to the left slope of the fixed valve strip.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention uses a circulation mechanism to drive sewage to circulate and be discharged onto a guide plate for evaporation. This allows some of the circulating sewage to recover the heat from compressing pure water, facilitating efficient evaporation of the sewage flowing on the guide plate and improving the efficiency and practicality of the device.

[0017] This invention allows for adjustment of the tilt of the guide plate via an adjustment mechanism, enabling some devices to adjust the flow area of ​​the liquid curtain based on the wastewater concentration, thereby adjusting the evaporation time of the flowing liquid curtain and improving the adjustability and practicality of the device.

[0018] The invention allows the lifting valve bar to slide up and down via a control mechanism, enabling some devices to adjust the thickness of the effluent curtain according to the sewage concentration. This facilitates the concentration of circulating sewage to a predetermined concentration, improving the controllability and practicality of the device. Attached Figure Description

[0019] Figure 1 This is a front side perspective view of the structure of the present invention; Figure 2 This is a frontal cross-sectional perspective view of a partial structure of the evaporator of the present invention; Figure 3 This is a front side perspective view of the structure of the present invention; Figure 4 This is a front sectional perspective view of a partial structure of the water storage tank and circulation mechanism of the present invention; Figure 5 This is a front sectional perspective view of a portion of the transmission box and adjustment mechanism of the present invention; Figure 6 This is a front cross-sectional perspective view of a partial structure of the evaporator and regulating mechanism of the present invention; Figure 7 This is a bottom perspective view of a partial structure of the guide plate and adjustment mechanism of the present invention; Figure 8 This is a frontal cross-sectional perspective view of a portion of the drainage head and control mechanism of the present invention.

[0020] In the diagram: 101. Evaporator; 102. Wastewater tank; 103. Water supply pump; 104. Compressor pump; 105. Clean water tank; 106. Water storage tank; 107. Pumping pipe; 108. Drain head; 109. Baffle plate; 110. Transmission box; 111. Control console; 2. Circulation mechanism; 201. First motor; 202. Rotating rod; 203. Screwdriver blade; 204. Heat exchange tube; 3. Adjustment mechanism; 301. Second motor; 302. Transmission worm gear; 303. 304. Transmission worm gear; 305. Transmission screw; 306. Pushing screw barrel; 307. Pushing rod; 308. Sliding frame; 309. Limiting sleeve; 310. Traction rod; 311. Extension plate; 312. Pulley; 313. Slide rail; 314. Telescopic rod; 315. Compression spring; 406. Control mechanism; 407. Push plate; 408. Wedge-shaped pressure bar; 409. Lifting valve bar; 4000. Telescopic cylinder; 401. Fixed frame; 402. Return spring; 403. Fixed valve bar. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-8 One embodiment provided by the present invention: A wastewater treatment device based on vacuum evaporation includes an evaporation box 101, a wastewater tank 102 fixedly connected to the left side of the evaporation box 101, a water supply pump 103 fixedly connected to the top of the wastewater tank 102, a drain pipe of the water supply pump 103 located inside the left side of the evaporation box 101, a compressor pump 104 fixedly connected to the top middle of the evaporation box 101, and a clean water tank 105 fixedly connected to the right side of the evaporation box 101. A water storage tank 106 is fixedly connected to the upper right side wall of the evaporator 101. A water pumping pipe 107 is fixedly connected to the middle bottom of the water storage tank 106. A drain head 108 is fixedly connected to the middle left side of the water storage tank 106. A guide plate 109 is movably connected to the inner wall of the evaporator 101 below the drain head 108. A transmission box 110 is fixedly connected to the upper left side wall of the evaporator 101. A control console 111 is fixedly connected to the middle front side of the evaporator 101. The water storage tank 106 is equipped with a circulation mechanism 2, which includes a first motor 201. The bottom of the first motor 201 is fixedly connected to the top center of the water storage tank 106, and a rotating rod 202 is fixedly connected to the bottom center of the first motor 201. The bottom end of the rotating rod 202 passes through the water storage tank 106 and is movably connected to the bottom of the inner wall of the water pumping pipe 107. An auger blade 203 is fixedly connected to the lower outer wall of the rotating rod 202. Through this design, the first motor 201 drives the rotating shafts 202 and 203 to rotate in a limited position, so that the auger blade 203 can transport the sewage from the bottom of the evaporator 101 to the inside of the water storage tank 106. This allows the water inside the water storage tank 106 to be discharged through the drain head 108 onto the guide plate 109, thereby increasing the evaporation area of ​​the sewage.

[0023] A heat exchange pipe 204 is installed on the inner wall of the water storage tank 106. The inlet end of the heat exchange pipe 204 passes through the water storage tank 106 and is fixedly connected to the middle right side of the compressor pump 104. The outlet end of the heat exchange pipe 204 passes through the water storage tank 106 and is fixedly connected to the top left side of the purified water tank 105. Through this design, the compressor pump 104 compresses low-temperature water vapor into high-temperature purified water and discharges it into the heat exchange pipe 204, allowing the high-temperature purified water in the heat exchange pipe 204 to exchange heat with the low-temperature wastewater. On the one hand, this raises the temperature of the wastewater to improve evaporation efficiency; on the other hand, it lowers the temperature of the purified water to avoid evaporation and waste.

[0024] The transmission box 110 is equipped with an adjustment mechanism 3, which includes a second motor 301. The rear of the second motor 301 is fixedly connected to the front of the transmission box 110. A transmission worm gear 302 is fixedly connected to the middle of the rear of the second motor 301. The rear end of the transmission worm gear 302 is movably connected to the rear of the inner wall of the transmission box 110. A transmission worm wheel 303 is meshed with the lower outer wall of the transmission worm gear 302. A transmission screw 304 is fixedly connected to the inner wall of the transmission worm wheel 303. The left end of the transmission screw 304 is movably connected to the left side of the inner wall of the transmission box 110. Through this design, the second motor 301 drives the transmission worm gear 302 to rotate in a limited position, so that the transmission worm gear 302 meshes with and drives the transmission worm wheel 303 and the transmission screw 304 to rotate in a limited position.

[0025] A pusher screw 305 is threaded onto the right side of the outer wall of the drive screw 304. A pusher rod 306 is fixedly connected to the right end of the pusher screw 305. The right end of the pusher rod 306 passes through the transmission box 110 and is fixedly connected to a sliding frame 307. A limiting sleeve 308 is fitted onto the middle of the outer wall of the sliding frame 307. The front and rear ends of the limiting sleeve 308 are fixedly connected to the upper inner wall of the evaporator 101. Through this design, the drive screw 304 drives the pusher screw 305 and the pusher rod 306 to slide in a limited position, so that the pusher rod 306 drives the sliding frame 307 to slide in a limited position on the inner wall of the limiting sleeve 308.

[0026] A traction rod 309 is movably connected to the left side of the sliding frame 307. The bottom end of the traction rod 309 is movably connected to the top left side of the guide plate 109. An extension plate 310 is inserted into the lower inner wall of the guide plate 109. Pulleys 311 are movably connected to the lower two sides of the extension plate 310. A slide rail 312 is provided on the left side of the outer wall of the pulley 311. The left side of the slide rail 312 is fixedly connected to the left side of the inner wall of the evaporator 101. Through this design, the sliding frame 307 drives the guide plate 109 and the extension plate 310 to rotate in a limited position via the traction rod 309, thereby adjusting the inclination of the guide plate 109 and the extension plate 310. The extension plate 310 drives the pulley 311 to slide along the slide rail 312, thereby adjusting the liquid curtain area above the guide plate 109 and the extension plate 310.

[0027] A telescopic rod 313 is fixedly connected to the right side of the extension plate 310. The right end of the telescopic rod 313 is fixedly connected to the bottom right side of the guide plate 109. A compression spring 314 is fixedly connected to the right side of the extension plate 310 on the outer ring of the telescopic rod 313. The right end of the compression spring 314 is fixedly connected to the bottom right side of the guide plate 109. Through this design, the compression spring 314 drives the extension plate 310 to slide to the left, so that the extension plate 310 drives the pulley 311 to always roll in close contact with the slide rail 312.

[0028] The drain head 108 is equipped with an adjustment mechanism 4, which includes a push plate 401. The left end of the push plate 401 is fixedly connected to the middle right side of the sliding frame 307, and the right end of the push plate 401 passes through the left side wall of the drain head 108 and is fixedly connected to a wedge-shaped pressure strip 402. A lifting valve strip 403 slides against the right side wall of the wedge-shaped pressure strip 402. Through this design, the sliding frame 307 can drive the wedge-shaped pressure strip 402 to slide left and right through the push plate 401, so that the wedge-shaped pressure strip 402 drives the lifting valve strip 403 to slide up and down. At the same time, the wedge structure can control the displacement ratio between the wedge-shaped pressure strip 402 and the lifting valve strip 403.

[0029] Telescopic cylinders 404 are fixedly connected to the top two sides of the lifting valve strip 403. A fixing frame 405 is fixedly connected to the top of the telescopic cylinder 404. The front and rear ends of the fixing frame 405 are fixedly connected to the middle of the inner wall of the drain head 108. A return spring 406 is fixedly connected to the top of the lifting valve strip 403 on the outer ring of the telescopic cylinder 404. The top of the return spring 406 is fixedly connected to the bottom two sides of the fixing frame 405. Through this design, the return spring 406 can drive the lifting valve strip 403 to slide downward, so that the left side of the lifting valve strip 403 is tightly attached to the left side wall of the wedge-shaped pressure strip 402.

[0030] A fixed valve strip 407 is provided on the right side of the lifting valve strip 403. The right side of the fixed valve strip 407 is fixedly connected to the right side of the inner wall of the drain head 108. The right side slope of the lifting valve strip 403 can be tightly attached to the left side slope of the fixed valve strip 407. Through this design, the lifting valve strip 403 can cooperate with the fixed valve strip 407 to adjust the thickness of the water curtain.

[0031] Working principle: When it is necessary to circulate and evaporate sewage, the first motor 201 is started by the control panel 111. The first motor 201 drives the rotating rod 202 to rotate to a limit position. The rotating rod 202 drives the auger blades 203 to rotate, so that the auger blades 203 transport the sewage inside the lower part of the evaporation tank 101 to the inside of the water storage tank 106. The water inside the water storage tank 106 is discharged through the drain head 108 to the top of the guide plate 109 and the extension plate 310 for vacuum evaporation, thus realizing the circulation and evaporation operation of sewage.

[0032] When the guide plate 109 needs to be rotated and adjusted, the second motor 301 is first started via the control console 111. The second motor 301 drives the transmission worm gear 302 to rotate in a limited position. The transmission worm gear 302 meshes and drives the transmission worm wheel 303 to rotate. The transmission worm wheel 303 drives the transmission screw 304 to rotate in a limited position. The transmission screw 304 drives the pusher barrel 305 to slide left and right. The pusher barrel 305 drives the pusher rod 306 to slide in a limited position. The pusher rod 306 drives the sliding frame 307 to slide in a limited position on the inner wall of the limiting sleeve 308. The sliding frame 307 drives the guide plate 109 and the extension plate 310 to rotate in a limited position via the traction rod 309, thus realizing the rotation adjustment operation of the guide plate 109.

[0033] Simultaneously, the compression spring 314 drives the extension plate 310 to slide to the left, causing the extension plate 310 to drive the pulley 311 to roll continuously against the slide rail 312, thereby adjusting the liquid curtain area above the guide plate 109 and the extension plate 310. When the concentration of wastewater is lower, the evaporation time of the flowing liquid curtain can be appropriately increased while avoiding the sedimentation of dirt. By increasing the inclination angle of the guide plate 109, the flow area of ​​the liquid curtain is increased, thus lengthening the evaporation time of the liquid curtain.

[0034] When the thickness of the liquid curtain needs to be adjusted, the sliding frame 307 first drives the push plate 401 to slide in a limited position. The push plate 401 then drives the wedge-shaped pressure strip 402 to slide synchronously. The return spring 406 drives the lifting valve strip 403 to slide downward, so that the left side of the lifting valve strip 403 is tightly attached to the wedge-shaped pressure strip 402. This allows the wedge-shaped pressure strip 402 to drive the lifting valve strip 403 to slide up and down. The lifting valve strip 403, in conjunction with the fixed valve strip 407, can adjust the thickness of the effluent liquid curtain, thus achieving the control of the liquid curtain thickness. When the wastewater concentration is lower, the liquid curtain thickness can be appropriately reduced.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A vacuum evaporation based sewage treatment apparatus comprising an evaporation tank (101), characterized in that: The left side of the evaporation box (101) is fixedly connected with a sewage tank (102), the top of the sewage tank (102) is fixedly connected with a water supply pump (103), the drain pipe of the water supply pump (103) is arranged inside the left side of the evaporation box (101), the top of the evaporation box (101) is fixedly connected with a compression pump (104) in the middle, and the right side of the evaporation box (101) is fixedly connected with a clean water tank (105). The upper side of the right side wall of the evaporation box (101) is fixedly connected with a water storage tank (106), the bottom of the water storage tank (106) is fixedly connected with a water pumping pipe (107) in the middle, the left side of the water storage tank (106) is fixedly connected with a water outlet (108) in the middle, the inner wall of the evaporation box (101) is movably connected with a flow guide plate (109) below the water outlet (108), the upper side of the left side wall of the evaporation box (101) is fixedly connected with a transmission box (110), and the front side of the evaporation box (101) is fixedly connected with a control console (111) in the middle. The inside of the water storage tank (106) is provided with a circulating mechanism (2), the circulating mechanism (2) comprises a first motor (201), the bottom of the first motor (201) is fixedly connected to the top of the water storage tank (106) in the middle, the inside of the transmission box (110) is provided with an adjusting mechanism (3), the adjusting mechanism (3) comprises a second motor (301), the rear side of the second motor (301) is fixedly connected to the front side of the transmission box (110), and the inside of the water outlet (108) is provided with a regulating mechanism (4).

2. A vacuum evaporation based sewage treatment apparatus as claimed in claim 1, wherein: The bottom of the first motor (201) is fixedly connected with a rotating rod (202), the bottom end of the rotating rod (202) penetrates through the water storage tank (106) and is movably connected to the inner wall of the bottom of the water pumping pipe (107), and the outer wall of the rotating rod (202) is fixedly connected with a spiral blade (203) below.

3. A vacuum evaporation based sewage treatment apparatus as claimed in claim 1, wherein: The inner wall of the water storage tank (106) is provided with a heat exchange pipe (204), the water inlet end of the heat exchange pipe (204) penetrates through the water storage tank (106) and is fixedly connected to the right side of the middle of the compression pump (104), and the water outlet end of the heat exchange pipe (204) penetrates through the water storage tank (106) and is fixedly connected to the top of the left side of the clean water tank (105).

4. A vacuum evaporation based sewage treatment apparatus as claimed in claim 1, wherein: The rear side of the second motor (301) is fixedly connected with a transmission worm (302) in the middle, the rear end of the transmission worm (302) is movably connected to the inner wall of the rear side of the transmission box (110), the outer wall of the transmission worm (302) is meshingly connected with a transmission worm gear (303) below, the inner wall of the transmission worm gear (303) is fixedly connected with a transmission screw (304), and the left end of the transmission screw (304) is movably connected to the inner wall of the left side of the transmission box (110).

5. A vacuum evaporation based sewage treatment apparatus as claimed in claim 4, wherein: The outer wall of the transmission screw (304) is threaded with a pusher cylinder (305) on the right side. The pusher cylinder (305) is fixedly connected to a pusher rod (306) at the right end. The pusher rod (306) passes through the transmission box (110) and is fixedly connected to a sliding frame (307). The outer wall of the sliding frame (307) is fitted with a limiting sleeve (308). The front and rear ends of the limiting sleeve (308) are fixedly connected to the upper inner wall of the evaporator (101).

6. A vacuum evaporation based sewage treatment apparatus as claimed in claim 5, wherein: A traction rod (309) is movably connected to the left side of the sliding frame (307). The bottom end of the traction rod (309) is movably connected to the top left side of the guide plate (109). An extension plate (310) is inserted below the inner wall of the guide plate (109). Pulleys (311) are movably connected to the lower sides of the extension plate (310). A slide rail (312) is provided on the left side of the outer wall of the pulley (311). The left side of the slide rail (312) is fixedly connected to the left side of the inner wall of the evaporator (101).

7. A vacuum evaporation based sewage treatment apparatus as claimed in claim 6, wherein: A telescopic rod (313) is fixedly connected to the right side of the extension plate (310). The right end of the telescopic rod (313) is fixedly connected to the bottom right side of the guide plate (109). A compression spring (314) is fixedly connected to the right side of the extension plate (310) on the outer ring of the telescopic rod (313). The right end of the compression spring (314) is fixedly connected to the bottom right side of the guide plate (109).

8. A vacuum evaporation based sewage treatment apparatus as claimed in claim 6, wherein: The control mechanism (4) includes a push plate (401), the left end of which is fixedly connected to the middle right side of the sliding frame (307), the right end of which passes through the left side wall of the drain head (108) and is fixedly connected to a wedge-shaped pressure strip (402), and the right side wall of the wedge-shaped pressure strip (402) is fitted with a lifting valve strip (403).

9. A vacuum evaporation based sewage treatment apparatus as claimed in claim 8, wherein: The top two sides of the lifting valve strip (403) are fixedly connected to telescopic cylinders (404), the top of the telescopic cylinder (404) is fixedly connected to a fixing frame (405), the front and rear ends of the fixing frame (405) are fixedly connected to the middle of the inner wall of the drain head (108), the top of the lifting valve strip (403) is located on the outer ring of the telescopic cylinder (404) and a return spring (406) is fixedly connected to it, the top of the return spring (406) is fixedly connected to the bottom two sides of the fixing frame (405).

10. A vacuum evaporation based sewage treatment apparatus as claimed in claim 8, wherein: The right side of the lifting valve strip (403) is provided with a fixed valve strip (407). The right side of the fixed valve strip (407) is fixedly connected to the right side of the inner wall of the drain head (108). The right side slope of the lifting valve strip (403) can be tightly attached to the left side slope of the fixed valve strip (407).

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