Low-temperature evaporator for sewage treatment

Abstract

The application discloses a low-temperature evaporator for sewage treatment and belongs to the field of sewage treatment, which comprises an evaporation barrel, a vacuum pump, a gas-liquid separator and a plurality of heating fins, the heating fins are distributed on the inner wall of the evaporation barrel, a discharge pipe is arranged at the bottom of the evaporation barrel, a steam outlet pipe and a sewage inlet pipe are arranged on the evaporation barrel, the vacuum pump is arranged on the side of the evaporation barrel and is communicated with the discharge pipe; a first circular ring is slidably arranged on the inner wall of the evaporation barrel, a plurality of scraping frames for cleaning the plurality of heating fins are fixedly connected to the circular ring, a through groove is formed in the first circular ring and is used for penetrating the heating plate, the scraping frames are slidably connected to the heating fins, and a driving assembly for driving the first circular ring to reciprocate in the vertical direction is arranged in the evaporation barrel; a sealing assembly for sealing the evaporation barrel is arranged in the discharge pipe, and an observation window for observing the internal condition of the evaporation barrel is arranged on the side wall of the evaporation barrel. The application has the effect of avoiding the attachment of pollutants on the heater, thereby improving the evaporation effect of the evaporation barrel.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a low-temperature evaporator for wastewater treatment. Background Technology

[0002] Wastewater evaporation technology is an effective method widely used in industrial and municipal wastewater treatment. Its working principle involves heating wastewater in a vacuum environment to evaporate the water, leaving behind concentrated pollutants, thereby reducing the volume and toxicity of the wastewater. This technology is particularly suitable for treating high-concentration, toxic, harmful, and difficult-to-degrade wastewater, such as wastewater from the chemical, pharmaceutical, and textile industries. The evaporation process not only significantly reduces the pollution load but also allows for the recovery of valuable resources, such as salts and metal ions, through wastewater concentration and crystallization. Therefore, wastewater evaporation technology has significant application value in achieving environmental protection and resource recovery.

[0003] A low-temperature evaporator mainly consists of an evaporation tank, a vacuum pump, and a heater. The evaporation tank has a steam outlet at the top and a discharge outlet at the bottom. A conveying pipe is installed inside the evaporation tank to spray wastewater into it. The vacuum pump intermittently extracts air from the evaporation tank to ensure a vacuum or low-pressure environment. The heater, typically a tubular or plate type, provides temperature to the inside of the evaporation tank, causing moisture to evaporate and enter other equipment through the steam outlet. The concentrated contaminants from the evaporation accumulate at the bottom of the evaporation tank and are discharged through the discharge outlet.

[0004] Impurities and other pollutants in the wastewater inside the evaporation tank will adhere to the heater. Over time, these adhering pollutants may solidify on the heater, reducing its heating effect and thus affecting the evaporation efficiency of the evaporation tank. Summary of the Invention

[0005] In order to avoid pollutants adhering to the heater and thus improve the evaporation effect of the evaporation tank, this application provides a low-temperature evaporator for wastewater treatment.

[0006] The low-temperature evaporator for wastewater treatment provided in this application adopts the following technical solution:

[0007] A low-temperature evaporator for wastewater treatment includes an evaporation tank, a vacuum pump, a gas-liquid separator, and multiple heating elements. The heating elements are evenly distributed on the inner wall of the evaporation tank. A discharge pipe is located at the bottom of the evaporation tank, and a steam outlet pipe and a wastewater inlet pipe are located on the top side wall of the evaporation tank. The discharge pipe connects to the interior of the evaporation tank. Multiple spray holes are located on the side wall of the wastewater inlet pipe, which extends into the evaporation tank. The gas-liquid separator is slidably installed inside the discharge pipe. The vacuum pump is located beside the evaporation tank and connected to the discharge pipe. A first ring slides along the inner wall of the evaporation tank. Multiple scraper frames for cleaning the heating elements are fixedly connected to the first ring. A through-groove is formed along the scraper frames on the first ring for the heating elements to pass through. The scraper frames are slidably connected to the heating elements. A drive assembly is provided inside the evaporation tank to drive the first ring to reciprocate vertically. A sealing assembly for sealing the evaporation tank is provided inside the discharge pipe. An observation window is provided on the side wall of the evaporation tank for observing the interior of the evaporation tank.

[0008] By adopting the above technical solution, when the evaporator is working, the drive component drives the first ring to move vertically. The movement of the first ring drives the scraper frame on it to move. The scraper frame slides back and forth on the surface of the heating element in the vertical direction, thereby scraping the sewage on the surface of the heating element to the bottom of the evaporator, avoiding the accumulation and adhesion of pollutants, and thus reducing the possibility that the heating element will reduce its heating effect due to the adhesion of pollutants. When the staff observes through the observation window that a lot of pollutants have accumulated at the bottom of the evaporator, the staff releases the sealing component from the evaporator, allowing the pollutants inside to be discharged from the outlet.

[0009] Preferably, the drive assembly includes a second ring and a plurality of telescopic rods. The second ring is fixedly connected to the inner wall of the evaporation tank, and the plurality of telescopic rods are fixedly connected between the first ring and the second ring. Each telescopic rod includes a main rod and a secondary rod. One end of the main rod is fixedly connected to the second ring. A telescopic groove is provided inside the main rod, and a return spring is provided inside the telescopic groove. The secondary rod slides within the telescopic groove and is connected to the return spring. The end of the secondary rod away from the main rod is fixedly connected to the first ring.

[0010] By adopting the above technical solution, the gas pressure inside the evaporation tank is intermittently vacuumed by the vacuum pump. When the vacuum pump is pumping, the gas pressure inside the evaporation tank gradually decreases, and the first ring moves downwards as the gas pressure decreases. This causes the scraper frame to slide downwards along the heating element to clean its surface. The downward movement of the first ring causes the auxiliary rod to compress the reset spring and move downwards. When the gas pressure inside the evaporation tank gradually increases as wastewater enters, the first ring moves upwards under the drive of the reset spring. Therefore, the first ring and the scraper frame reciprocate vertically in accordance with the pumping frequency of the vacuum pump, thereby achieving the effect of cleaning dirt from the surface of the heating element.

[0011] Preferably, a connecting block is provided at the center of the first ring, and a connecting rod is provided between the connecting block and the first ring. A screw is rotatably provided inside the evaporation tank. The screw passes through and is threadedly connected to the connecting block. A diagonal rod is fixedly connected to one end of the screw, and an arc-shaped plate is fixedly connected to the end of the diagonal rod away from the screw. The arc-shaped plate is slidably connected to the bottom side wall of the evaporation tank.

[0012] By adopting the above technical solution, when the first ring moves in the vertical direction, the screw can be driven to rotate through the thread. The rotation of the screw drives the inclined rod to rotate inside the evaporation tank. The rotation of the inclined rod drives the arc plate to slide along the bottom of the evaporation tank, thereby stirring the sewage in the evaporation tank and continuously scraping and stirring the bottom of the tank. This can accelerate the evaporation of water and avoid the situation where the bottom sediment has been settled for too long and has hardened and stuck together, making it difficult to clean.

[0013] Preferably, the sealing assembly includes a sealing block and a rubber ring. The sealing block slides inside the discharge pipe, and the rubber ring wraps around the peripheral wall of the sealing block. The sealing block and the gas-liquid separator are connected by a support rod. The vacuum pump is connected at the position between the sealing block and the gas-liquid separator. The bottom of the evaporation tank is provided with a release assembly for driving the sealing block to move and release the sealing state. The discharge pipe port is connected to an output pipe.

[0014] By adopting the above technical solution, when the evaporator is working, the gas-liquid separator is located at the connection between the discharge pipe and the evaporator. The gas-liquid separator can prevent liquid from flowing into the discharge pipe, and the sealing block and rubber ring can enhance the sealing degree of the discharge pipe.

[0015] Preferably, the release assembly includes a rotating rod, a first gear, and a motor. The motor is mounted on the bottom side wall of the evaporation tank. The rotating rod is fixedly connected to the side wall of the sealing block away from the gas-liquid separator. A sleeve block is fixedly connected to the outer wall of the bottom of the evaporation tank. The sleeve block communicates with the discharge pipe. The output pipe is connected to the sleeve block. A fixing block is fixedly connected to the outer wall of the sleeve block. The rotating rod passes through the fixing block. The first gear is threadedly connected to the rotating rod and rotates on the fixing block. A second gear is fixedly sleeved on the motor. The second gear meshes with the first gear. The fixing block is respectively provided with a first limiting component and a second limiting component for limiting the clockwise and counterclockwise rotation of the rotating rod. A rotating component for driving the screw to rotate is provided on the rotating rod.

[0016] By adopting the above technical solution, after the evaporation tank has been running for a period of time, the staff first stops the sewage from entering. When the water in the evaporation tank has basically evaporated, the staff starts the motor. The motor drives the second gear to rotate, and the rotation of the second gear drives the first gear to rotate. Under the action of the first limiting component, the rotation of the first gear drives the rotating rod to move upward in a straight line until the sealing block is inside the evaporation tank and disengages from the discharge pipe. At this time, the pollutants accumulated at the bottom of the evaporation tank enter the discharge pipe and are discharged through the output pipe. Subsequently, the screw rotates under the action of the rotating parts, accelerating the discharge of pollutants in the evaporation tank. When the staff needs to close the discharge pipe, the motor reverses, and the rotating rod moves downward in a straight line under the action of the second limiting component, so that the sealing block enters the discharge pipe for sealing.

[0017] Preferably, the first limiting component includes a first limiting block and a first spring. The fixed block has a first limiting groove, and the rotating rod has a first placement groove on its side wall. The first limiting block slides in the first placement groove, and the first spring is disposed in the first placement groove with its two ends fixedly connected to the first limiting block and the inner wall of the first placement groove, respectively. The side wall of the first limiting block has a first inclined surface, and the top has a second inclined surface. When the rotating rod rotates clockwise, the side of the first limiting block away from the first inclined surface abuts against the inner wall of the first limiting groove, thereby limiting the rotation of the rotating rod. When the first limiting block moves to the top inner wall of the first limiting groove, the second inclined surface causes the first limiting block to compress the first spring and place it in the first placement groove.

[0018] By adopting the above technical solution, when the motor drives the rotating rod to rotate clockwise, the side of the first limiting block away from the first inclined surface abuts against the first limiting groove, thereby restricting the rotation of the rotating rod. At this time, the rotating rod moves vertically upward under the thread drive of the first gear, thereby opening the sealing block. Afterward, the motor continues to rotate, causing the first limiting block to be pushed into the first placement groove under the action of the second inclined surface. At this time, the rotating rod rotates following the drive of the motor.

[0019] Preferably, the second limiting component includes a second limiting block and a second spring. A second limiting groove is formed in the fixed block, and the second limiting groove is located below the first limiting groove. A second placement groove is formed on the side wall of the rotating rod, and the second placement groove is located below the first placement groove. The second limiting block slides in the second placement groove. The second spring is disposed in the second placement groove, and its two ends are respectively fixedly connected to the inner wall of the second limiting block and the second placement groove. A third inclined surface is provided on the side wall of the second limiting block, and a fourth inclined surface is provided at the bottom. The third inclined surface is opposite in direction to the first inclined surface. When the rotating rod rotates counterclockwise, the side of the second limiting block away from the third inclined surface abuts against the inner wall of the second limiting groove, thereby limiting the rotation of the rotating rod. When the rotating rod moves downward to the bottom of the second limiting block, the second limiting block is pushed into the second placement groove under the action of the fourth inclined surface, compressing the second spring.

[0020] By adopting the above technical solution, when the motor drives the rotating rod to rotate counterclockwise to close the discharge pipe, the second limiting block is in the second limiting groove and the side wall facing away from the second inclined surface abuts against the inner wall of the second limiting groove, thereby limiting the rotation of the rotating rod. Under the thread drive of the first gear, the rotating rod moves downward in a straight line, driving the sealing block to move into the discharge pipe and seal the discharge pipe port.

[0021] Preferably, the rotating component is a plug rod, which is fixedly connected to the gas-liquid separator, and the bottom of the screw has a slot for the plug rod to be inserted.

[0022] By adopting the above technical solution, when the rotating rod moves vertically into the evaporation tank under the action of the first limiting component, the insert rod is pushed into the slot on the screw by the sealing block. After the sealing block is separated from the discharge pipe, the motor continues to rotate clockwise. At this time, the rotating rod rotates and drives the screw to rotate. The screw rotates and drives the arc plate to rotate, thereby accelerating the discharge of pollutants at the bottom of the evaporation tank and avoiding excessive concentration of pollutants and poor flow.

[0023] Preferably, a fifth inclined surface is provided on the side wall of the arc-shaped plate along the direction extending from the lowest point.

[0024] By adopting the above technical solution, when pollutants are discharged, the fifth inclined surface on the arc plate can better direct the pollutants to the lowest end of the evaporation tank.

[0025] Preferably, the output pipe is Y-shaped, a sleeve block is connected to the bottom of the outer side of the evaporation tank, a conical block is provided in the middle of the sleeve block, the rotating rod passes through the conical block, and the output pipe is connected to the sleeve block.

[0026] By adopting the above technical solution, the cone block can guide pollutants into the output pipe.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. When the evaporator is working, the drive assembly drives the first ring to move vertically. The movement of the first ring drives the scraper frame on it to move. The scraper frame slides back and forth vertically on the surface of the heating element, thereby scraping the wastewater on the surface of the heating element to the bottom of the evaporator, preventing the accumulation and adhesion of pollutants, and thus reducing the possibility of the heating element being reduced in heating effect due to the accumulation of pollutants. When the operator observes through the observation window that a lot of pollutants have accumulated at the bottom of the evaporator, the operator releases the sealing assembly from the evaporator, allowing the pollutants inside to be discharged from the outlet.

[0029] 2. The intermittent pumping of the vacuum pump keeps the evaporator in a vacuum state intermittently. When the vacuum pump pumps air, the air pressure in the evaporator gradually decreases. The first ring moves downward as the air pressure decreases, which drives the scraper frame to slide down along the heating element to clean its surface. The downward movement of the first ring causes the auxiliary rod to compress the return spring and move downward. When the air pressure in the evaporator gradually increases as wastewater enters, the first ring moves upward under the drive of the return spring. Therefore, the first ring and the scraper frame reciprocate vertically in accordance with the pumping frequency of the vacuum pump, thereby achieving the effect of cleaning dirt from the surface of the heating element.

[0030] 3. When the first ring moves vertically, the screw is driven to rotate through the thread. The rotation of the screw drives the inclined rod to rotate inside the evaporation tank. The rotation of the inclined rod drives the arc plate to slide along the bottom of the evaporation tank, thereby stirring the sewage in the evaporation tank and continuously scraping and stirring the bottom of the tank. This accelerates the evaporation of water and prevents the bottom from settling for too long, causing it to solidify and stick, making it difficult to clean. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a low-temperature evaporator for wastewater treatment.

[0032] Figure 2 This is a schematic cross-sectional view of a low-temperature evaporator for wastewater treatment.

[0033] Figure 3 This is a schematic diagram of the structure of the telescopic rod in the embodiment of this application.

[0034] Figure 4 This is a schematic diagram of the structure of the prominent sealing component in an embodiment of this application.

[0035] Figure 5 This is a schematic diagram of the structure of the prominent release component in an embodiment of this application.

[0036] Figure 6 This is a schematic diagram of the structure of the first limiting component highlighted in the embodiment of this application.

[0037] Figure label:

[0038] 1. Evaporation tank; 2. Vacuum pump; 3. Gas-liquid separator; 4. Heating element; 5. Discharge pipe; 6. Steam outlet pipe; 7. First ring; 8. Scraper frame; 9. Through groove; 10. Drive assembly; 11. Sealing assembly; 12. Observation window; 13. Second ring; 14. Telescopic rod; 15. Main rod; 16. Auxiliary rod; 17. Telescopic groove; 18. Return spring; 19. Connecting block; 20. Connecting rod; 21. Screw; 22. Diagonal rod; 23. Arc plate; 24. Sealing block; 25. Rubber ring; 26. Support rod; 27. Release assembly; 28. Output pipe; 29. ​​Rotating rod 30. First gear; 31. Motor; 32. Sleeve block; 33. Fixing block; 34. Second gear; 35. First limiting component; 36. Second limiting component; 37. Insert rod; 38. First limiting block; 39. First spring; 40. First limiting groove; 41. First placement groove; 42. First inclined surface; 43. Second inclined surface; 44. Second limiting block; 45. Second spring; 46. Second limiting groove; 47. Second placement groove; 48. Third inclined surface; 49. Fourth inclined surface; 50. Fifth inclined surface; 51. Sewage input pipe; 52. Spray hole; 53. Air pipe. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0040] This application discloses a low-temperature evaporator for wastewater treatment, such as... Figure 1 and Figure 2As shown, the system includes an evaporator 1, a vacuum pump 2, a gas-liquid separator 3, and multiple heating elements 4. An observation window 12 for observing the interior of the evaporator 1 is provided on its side wall. Multiple heating elements 4 are evenly distributed on the inner circumference of the evaporator 1. A steam outlet pipe 6 and a wastewater inlet pipe 51 are located at the top of the evaporator 1, extending into the upper part of the evaporator 1 near the middle. Multiple spray holes 52 for spraying wastewater are opened on the circumferential side wall of the wastewater inlet pipe 51. A discharge pipe 5 is located at the bottom of the evaporator 1, connecting to the lowest point inside the evaporator 1. The gas-liquid separator 3 is slidably installed inside the discharge pipe 5 and located at the connection between the evaporator 1 and the discharge pipe 5, preventing liquid from entering the discharge pipe 5 from the evaporator 1. The vacuum pump 2 is located beside the evaporator 1 and connected to the discharge pipe 5 via an air pipe 53. The gas-liquid separator 3 discharges air from the evaporator 1, leaving the liquid.

[0041] like Figure 2 As shown, a first ring 7 slides vertically along the upper interior of the evaporation tank 1. Multiple scraper frames 8 for cleaning the heating elements 4 are fixedly welded to the lower end face of the first ring 7. Each scraper frame 8 corresponds to one heating element 4. A through groove 9 for the heating elements 4 is vertically formed along the position of the scraper frame 8 on the first ring 7, preventing the first arc from restricting the movement range of the scraper frame 8. The scraper frame 8 slides vertically onto the surface of the heating element 4. A drive assembly 10 is installed inside the evaporation tank 1 to drive the first ring 7 to reciprocate vertically. Under the drive assembly 10, the first ring 7 can carry the scraper frames 8 back and forth on the heating elements 4, thereby cleaning contaminants adhering to the surface of the heating elements 4. A sealing assembly 11 for sealing the evaporation tank 1 is installed inside the discharge pipe 5. A release assembly 27 for releasing the sealing effect of the sealing assembly 11 and removing contaminants is installed at the bottom outer side of the evaporation tank 1.

[0042] like Figure 2 and Figure 3As shown, the drive assembly 10 includes a second ring 13 and multiple telescopic rods 14. The second ring 13 is fixedly welded to the inner wall of the lower end of the evaporator tank 1 and is located below the heating element 4. The multiple telescopic rods 14 are arranged vertically, and their two ends are fixedly welded to the lower end face of the first ring 7 and the upper end face of the second ring 13, respectively. The telescopic rod 14 includes a main rod 15 and a secondary rod 16. The main rod 15 is located below the secondary rod 16. The upper end face of the main rod 15 extends vertically and has a telescopic groove 17. A return spring 18 is vertically arranged in the telescopic groove 17. The sliding bottom end of the secondary rod 16 is fixedly welded to the top end of the return spring 18 and slides vertically in the telescopic groove 17. The intermittent pumping of vacuum pump 2 keeps the gas pressure inside evaporator 1 in a vacuum state. As vacuum pump 2 pumps air, the gas pressure in evaporator 1 gradually decreases. The first ring 7 moves downwards along the inner wall of evaporator 1 following the pressure change, thereby causing the scraper frame 8 to slide downwards along the surface of heating element 4 and clean its surface. The downward movement of the first ring 7 causes the auxiliary rod 16 to compress the return spring 18. When the gas pressure inside evaporator 1 gradually increases as wastewater enters, the first ring 7 moves upwards under the drive of the return spring 18. Therefore, the first ring 7 and scraper frame 8 reciprocate vertically in accordance with the pumping frequency of vacuum pump 2, thus achieving the effect of cleaning dirt from the surface of heating element 4.

[0043] like Figure 2 and Figure 4 As shown, a connecting block 19 is provided at the center of the first ring 7. The connecting block 19 is cylindrical and its axis is set in the vertical direction. It is located on the axis of the evaporation tank 1. The connecting block 19 and the first ring 7 are connected by three connecting rods 20. The three connecting rods 20 are evenly distributed in the first ring 7, and their two ends are fixedly welded to the outer peripheral sidewall of the connecting block 19 and the inner peripheral sidewall of the first ring 7, respectively. An evaporator 1 is equipped with a screw 21 that rotates vertically along its axis. The top of the screw 21 is rotatably connected to the inner top wall of the evaporator 1. The screw 21 passes through and is threadedly connected to the connecting block 19. A diagonal rod 22 is fixedly welded to the bottom of the screw 21. The diagonal rod 22 is inclined. An arc-shaped plate 23 is fixedly welded to the end of the diagonal rod 22 away from the screw 21. The arc-shaped plate 23 slides against the arc of the bottom side wall of the evaporator 1 and is connected to the inner bottom wall of the evaporator 1. The fifth inclined surface 50 is provided along the side wall of the arc-shaped plate 23, with the width gradually decreasing from the end away from the discharge pipe 5 to the end closer to the discharge pipe 5. The fifth inclined surface 50 facilitates pushing the contaminants on the inner bottom wall of the evaporator 1 toward the lowest end of the evaporator 1. When the vacuum pump 2 is running intermittently, the screw 21 rotates following the drive of the first ring 7. The rotation of the screw 21 drives the inclined rod 22 and the arc plate 23 to stir in the evaporation tank 1, thereby accelerating the evaporation of water in the evaporation tank 1. At the same time, it prevents pollutants on the bottom inner wall of the evaporation tank 1 from sticking together for a long time and solidifying, which would increase the difficulty of cleaning.

[0044] like Figure 4 and Figure 5 As shown, the sealing assembly 11 includes a sealing block 24 and a rubber ring 25. The rubber ring 25 wraps around the peripheral wall of the sealing block 24. The sealing block 24 slides vertically against the inner wall of the discharge pipe 5. The sealing block 24 and the gas-liquid separator 3 are fixedly connected by a support rod 26, which is set vertically. When the evaporation tank 1 is running, the sealing block 24 is inside the discharge pipe 5, and the gas-liquid separator 3 is located at the connection between the discharge pipe 5 and the evaporation tank 1, preventing liquid in the evaporation tank 1 from entering the discharge pipe 5. The pipeline of the vacuum pump 2 is connected to the discharge pipe 5 between the sealing block 24 and the gas-liquid separator 3. When the evaporation tank 1 is running, the vacuum pump 2 extracts the gas from the evaporation tank 1 through the gas-liquid separator 3. A release assembly 27 is provided at the bottom outer side of the evaporation tank 1 to drive the sealing block 24 to move upward and release the seal. A sleeve block 32 is connected to the outer port of the discharge pipe 5, and an output pipe 28 is connected to the bottom of the sleeve block 32. The output pipe 28 is Y-shaped. The center of the sleeve 32 is a conical block placed upright, and the two ends of the output tube 28 are connected to the two sides of the sleeve 32 located on the conical block.

[0045] like Figure 5 and Figure 6 As shown, the release assembly 27 includes a rotating rod 29, a first gear 30, and a motor 31. The motor 31 is fixedly installed on the bottom side wall of the evaporator tank 1. The rotating rod 29 is cylindrical and vertically oriented. The rotating rod 29 passes through the axis of a conical block and is fixedly welded to the lower end face of the sealing block 24. A fixing block 33 is fixedly welded to the lower end face of the sleeve block 32. A through hole for the rotating rod 29 to pass through is provided in the fixing block 33 vertically. A first limiting component 35 for limiting the clockwise rotation of the rotating rod 29 and a second limiting component 36 for limiting the counterclockwise rotation of the rotating rod 29 are provided in the fixing block 33. The first gear 30 is threadedly connected to the rotating rod 29 and rotates on the lower end face of the fixing block 33. A second gear 34 is fixedly sleeved on the shaft of the motor 31. The second gear 34 meshes with the first gear 30. A rotating component for driving the screw 21 to rotate is provided on the rotating rod 29. The rotating part is the insertion rod 37, which is rectangular in shape. The insertion rod 37 is fixedly welded to the upper end face of the gas-liquid separator 3 and is arranged in a vertical direction. The bottom of the screw 21 has a slot for the insertion rod 37 to be inserted, and the slot is rectangular in shape.

[0046] like Figure 6As shown, the first limiting component 35 is located above the second limiting component 36. The first limiting component 35 includes a first limiting block 38 and a first spring 39. A first limiting groove 40 is formed in the fixing block 33, which is arranged vertically. A first placement groove 41 is formed on the side wall of the rotating rod 29 in the horizontal direction. The first limiting block 38 slides horizontally in the first placement groove 41. The first spring 39 is horizontally arranged in the first placement groove 41, and its two ends are respectively fixedly welded to the inner wall of the first limiting block 38 and the first placement groove 41. A first inclined surface 42 is provided on the side wall of the first limiting block 38, and a second inclined surface 43 is provided on the top of the first limiting block 38. The second limiting component 36 includes a second limiting block 44 and a second spring 45. A second limiting groove 46 is vertically formed inside the fixing block 33, and the second limiting groove 46 is located below the first limiting groove 40. A second placement groove 47 is formed on the side wall of the rotating rod 29 in the horizontal direction, and the second placement groove 47 is located below the first placement groove 41. The second limiting block 44 slides horizontally in the second placement groove 47. The second spring 45 is horizontally set in the second placement groove 47 and its two ends are respectively fixedly welded to the inner walls of the second limiting block 44 and the second placement groove 47. A third inclined surface 48 is provided on the side wall of the second limiting block 44 and a fourth inclined surface 49 is provided at the bottom of the second limiting block 44. The first inclined surface 42 and the third inclined surface 48 are in opposite directions, and the second inclined surface 43 and the fourth inclined surface 49 are in opposite directions.

[0047] like Figure 4 and Figure 5 As shown, and in combination Figure 6As shown, when it is necessary to remove the concentrated contaminants in the evaporation tank 1, the operator starts the motor 31. The motor 31 drives the second gear 34 to rotate, and the rotation of the second gear 34 drives the first gear 30 to rotate clockwise. At this time, the first limiting block 38 is located below the first limiting groove 40 and its side wall away from the first inclined surface 42 abuts against the inner wall of the first limiting groove 40. The second limiting block 44 is located below the second limiting groove 46 and is pushed into the second placement groove 47 by the perforated inner wall of the fixing block 33, compressing the second spring 45. At this time, the first gear 30 rotates clockwise, driving the rotating rod 29 to move vertically upward in a straight line. The upward movement of the rotating rod 29 drives the sealing block 24, the gas-liquid separator 3, and the insert rod 37 on it to move upward together. The diameter of the rotating rod 29 is much smaller than the diameter of the discharge pipe 5. When the sealing block 24 is separated from the discharge pipe 5, the contaminants at the bottom of the evaporation tank 1 enter the discharge pipe 5 and are discharged through the sleeve block 32 and the output pipe 28. When the second limiting block 44 moves upward to the position of the second limiting groove 46, it is inserted into the second limiting groove 46 under the push of the second spring 45. When the first limiting block 38 moves to the top of the first limiting groove 40, it is pushed into the first placement groove 41 by the inner wall of the top of the first limiting groove 40 under the action of the second inclined surface 43, compressing the first spring 39 and abutting against the inner wall of the perforation in the fixed block 33. The third inclined surface 48 of the second limiting block 44 is in a clockwise position. At this time, the rotating rod 29 rotates with the first gear 30. The rotation of the rotating rod 29 drives the insertion rod 37 to rotate. The rotation of the insertion rod 37 drives the screw 21 to rotate. The rotation of the screw 21 drives the arc plate 23 to rotate, thereby accelerating the discharge of pollutants at the bottom of the evaporation tank 1 and avoiding excessive concentration and poor flowability of pollutants.

[0048] like Figure 4 and Figure 5 As shown, and in combination Figure 6As shown, after the pollutants in the evaporation tank 1 are discharged, the motor 31 drives the rotating rod 29 to rotate counterclockwise. At this time, the first limiting block 38 rotates counterclockwise in the perforation, and the second limiting block 44 rotates away from the third inclined surface 48 driven by the rotating rod. Under the obstruction of the inner wall of the second limiting groove 46, the second limiting block 44 is hindered from rotating in the second limiting groove 46. Therefore, the rotating rod 29 is driven to move vertically downward in a straight line. The downward movement of the rotating rod 29 drives the sealing block 24 and others to move towards the discharge pipe 5, so that the insertion rod 37 disengages from the slot on the screw 21, and the screw 21 stops rotating. When the sealing block 24 moves into the discharge pipe 5 and the gas-liquid separator 3 moves to the port of the discharge pipe 5, the second limiting block 44 has moved to the bottom of the second limiting groove 46 and is gradually pushed into the second placement groove 47 under the action of the fourth inclined surface 49. At this time, the limiting effect of the second limiting block 44 on the rotation of the rotating rod 29 disappears, and the first limiting block 38 is already within the height range of the first limiting groove 40. After the rotating rod 29 rotates and the first limiting block 38 rotates into the first limiting groove 40, the rotating rod 29 is restricted from rotating under the restriction of the first limiting block 38. At this time, the motor 31 stops.

[0049] The implementation principle of this application embodiment is as follows: When the evaporation tank 1 is working, the vacuum pump 2 intermittently pumps air into the evaporation tank 1 to maintain its internal vacuum or pressure state. Under the action of the drive component 10, the first ring 7 moves back and forth in the vertical direction with multiple scraper frames 8, thereby scraping off the sewage on the surface of the heating plate 4, so as to prevent pollutants from settling and adhering to the surface of the heating plate 4 and affecting the heating effect of the heating plate 4 on the inside of the evaporation tank 1. When the staff observes through the observation window 12 that a large amount of contaminants have accumulated at the bottom of the evaporation tank 1, the staff starts the motor 31. The motor 31 drives the rotating rod 29 to rotate through the second gear 34 and the first gear 30. Under the action of the first limiting component 35, the rotating rod 29 moves upward in a straight line until the insertion rod 37 is inserted into the slot, releasing the sealing effect of the sealing component 11. Subsequently, the first limiting component 35 releases the restriction on the rotating rod 29, causing the rotating rod 29 to rotate and drive the screw 21 to rotate, accelerating the discharge of contaminants. After the contaminants are discharged, the motor 31 reverses, and the rotating rod 29 moves downward in a straight line under the action of the second limiting component 36 until the insertion rod 37 is away from the slot, and the sealing component 11 re-seals the discharge pipe 5. The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-temperature evaporator for wastewater treatment, comprising an evaporation tank (1), a vacuum pump (2), a gas-liquid separator (3), and a plurality of heating elements (4), wherein the plurality of heating elements (4) are evenly distributed on the inner sidewall of the evaporation tank (1), a discharge pipe (5) is provided at the bottom of the evaporation tank (1), and a steam outlet pipe (6) and a wastewater inlet pipe (51) are provided on the top sidewall of the evaporation tank (1), wherein the discharge pipe (5) is connected to the interior of the evaporation tank (1); characterized in that: The wastewater inlet pipe (51) extends into the evaporation tank (1) and has multiple spray holes (52) on one side wall. The gas-liquid separator (3) is slidably installed inside the outlet pipe (5). The vacuum pump (2) is located beside the evaporation tank (1) and connected to the outlet pipe (5). A first ring (7) slides on the inner wall of the evaporation tank (1). Multiple scraper frames (8) for cleaning multiple heating elements (4) are fixedly connected to the first ring (7). A through groove (9) is provided at the upper edge of the scraper frame (8) for the heating element (4) to pass through. The scraper frame (8) is slidably connected to the heating element (4). A drive assembly (10) is provided inside the evaporator (1) to drive the first ring (7) to reciprocate in the vertical direction. A sealing assembly (11) is provided inside the discharge pipe (5) for sealing the evaporator (1). An observation window (12) is provided on the side wall of the evaporator (1) for observing the internal condition of the evaporator (1). The drive assembly (10) includes a second ring (13) and a plurality of telescopic rods (14). The second ring (13) is fixedly connected to the inner wall of the evaporation tank (1), and the plurality of telescopic rods (14) are fixedly connected between the first ring (7) and the second ring (13). The telescopic rod (14) includes a main rod (15) and a secondary rod (16). One end of the main rod (15) is fixedly connected to the second ring (13). A telescopic groove (17) is provided in the main rod (15). A return spring (18) is provided in the telescopic groove (17). The secondary rod (16) slides in the telescopic groove (17) and is connected to the return spring (18). The end of the secondary rod (16) away from the main rod (15) is fixedly connected to the first ring (7).

2. The low-temperature evaporator for wastewater treatment according to claim 1, characterized in that: A connecting block (19) is provided at the center of the first ring (7), and a connecting rod (20) is provided between the connecting block (19) and the first ring (7). A screw (21) is rotatably provided inside the evaporation tank (1). The screw (21) passes through and is threadedly connected to the connecting block (19). One end of the screw (21) is fixedly connected to a slanted rod (22). The end of the slanted rod (22) away from the screw (21) is fixedly connected to an arc plate (23). The arc plate (23) is slidably connected to the bottom side wall of the evaporation tank (1).

3. A low-temperature evaporator for wastewater treatment according to claim 2, characterized in that: The sealing assembly (11) includes a sealing block (24) and a rubber ring (25). The sealing block (24) slides inside the discharge pipe (5). The rubber ring (25) wraps around the peripheral wall of the sealing block (24). The sealing block (24) and the gas-liquid separator (3) are connected by a support rod (26). The vacuum pump (2) is connected between the sealing block (24) and the gas-liquid separator (3). The bottom of the evaporation tank (1) is provided with a release assembly (27) for driving the sealing block (24) to move and release the sealing state. The port of the discharge pipe (5) is connected to an output pipe (28).

4. A low-temperature evaporator for wastewater treatment according to claim 3, characterized in that: The release assembly (27) includes a rotating rod (29), a first gear (30), and a motor (31). The motor (31) is mounted on the bottom side wall of the evaporation tank (1). The rotating rod (29) is fixedly connected to the side wall of the sealing block (24) away from the gas-liquid separator (3). A sleeve block (32) is fixedly connected to the bottom outer wall of the evaporation tank (1). The sleeve block (32) is connected to the discharge pipe (5). The output pipe (28) is connected to the sleeve block (32). A fixing block (33) is fixedly connected to the outer side wall of the sleeve block (32). A rod (29) passes through the fixed block (33). The first gear (30) is threadedly connected to the rotating rod (29) and rotates on the fixed block (33). A second gear (34) is fixedly sleeved on the motor (31). The second gear (34) meshes with the first gear (30). The fixed block (33) is provided with a first limiting component (35) and a second limiting component (36) for limiting the clockwise and counterclockwise rotation of the rotating rod (29). The rotating rod (29) is provided with a rotating component for driving the screw (21) to rotate.

5. A low-temperature evaporator for wastewater treatment according to claim 4, characterized in that: The first limiting component (35) includes a first limiting block (38) and a first spring (39). A first limiting groove (40) is provided in the fixed block (33), and a first placement groove (41) is provided on the side wall of the rotating rod (29). The first limiting block (38) slides in the first placement groove (41). The first spring (39) is disposed in the first placement groove (41), and its two ends are respectively fixedly connected to the inner walls of the first limiting block (38) and the first placement groove (41). The side wall of the first limiting block (38) The device is provided with a first inclined surface (42) and a second inclined surface (43) at the top. When the rotating rod (29) rotates clockwise, the side of the first limiting block (38) away from the first inclined surface (42) abuts against the inner wall of the first limiting groove (40) to limit the rotation of the rotating rod (29). When the first limiting block (38) moves to the inner wall at the top of the first limiting groove (40), the second inclined surface (43) causes the first limiting block (38) to compress the first spring (39) and place it in the first placement groove (41).

6. A low-temperature evaporator for wastewater treatment according to claim 5, characterized in that: The second limiting component (36) includes a second limiting block (44) and a second spring (45). The fixing block (33) has a second limiting groove (46) inside, which is located below the first limiting groove (40). The rotating rod (29) has a second placement groove (47) on its side wall, which is located below the first placement groove (41). The second limiting block (44) slides in the second placement groove (47). The second spring (45) is disposed in the second placement groove (47) and its two ends are fixedly connected to the inner wall of the second limiting block (44) and the second placement groove (47) respectively. The second limiting block (44) has a third inclined surface (48) on its side wall and a fourth inclined surface (49) at its bottom. The third inclined surface (48) and the first inclined surface (42) are in opposite directions. When the rotating rod (29) rotates counterclockwise, the side of the second limiting block (44) away from the third inclined surface (48) abuts against the inner wall of the second limiting groove (46), thereby restricting the rotating rod (29) from rotating. When the rotating rod (29) moves downward to the bottom of the second limiting block (44) at the second limiting groove (46), the second limiting block (44) is pushed into the second placement groove (47) under the action of the fourth inclined surface (49) to compress the second spring (45).

7. A low-temperature evaporator for wastewater treatment according to claim 4, characterized in that: The rotating component is a plug rod (37), which is fixedly connected to the gas-liquid separator (3). The bottom of the screw (21) has a slot for the plug rod (37) to be inserted.

8. A low-temperature evaporator for wastewater treatment according to claim 2, characterized in that: A fifth inclined surface (50) is provided on the side wall of the arc-shaped plate (23) along the direction of its lowest point.

9. A low-temperature evaporator for wastewater treatment according to claim 4, characterized in that: The output pipe (28) is Y-shaped. A sleeve block (32) is connected to the bottom of the outer side of the evaporation tank (1). A conical block is provided in the middle of the sleeve block (32). The rotating rod (29) passes through the conical block. The output pipe (28) is connected to the sleeve block (32).

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