Heavy metal contaminated soil purification equipment

Abstract

The application discloses a heavy metal contaminated soil purification equipment and relates to the technical field of soil purification. The equipment comprises a purification box, a stirring mechanism is arranged in the purification box, the stirring mechanism comprises a rotating lead screw arranged in the purification box, the rotating lead screw is fixedly connected with a second stirring rod, the rotating lead screw is fixedly connected with a fixing rod, the fixing rod is slidably connected with a fifth gear, the fifth gear is meshedly connected with a fourth gear, the fourth gear is fixedly connected with a worm, the worm is meshedly connected with a turbine, the turbine is fixedly connected with a third connecting plate, the third connecting plate is rotatably connected with a first connecting plate, in the application, the stirring mechanism and the soil turning mechanism in the purification box realize cooperative work through mechanical transmission, the second stirring rod moves up and down while rotating and stirring, the soil is turned over, the vertical stratification structure of the soil is broken, the liquid medicine is uniformly penetrated, and the soil purification effect is improved.

Description

Technical Field

[0001] This invention relates to the field of soil purification technology, and in particular to a device for purifying heavy metal contaminated soil. Background Technology

[0002] Industrial pollutant emissions, agricultural activities, and mining activities lead to the entry of large amounts of heavy metals such as lead, cadmium, and mercury into the soil. Heavy metal-contaminated soils are characterized by regional differences, wide pollution range, and deep-seated pollution. They not only damage soil structure, reduce soil fertility, and affect plant growth, but also enter the human body through the food chain, posing a threat to human health. Soil leaching technology uses a washing solution to transfer heavy metals from the soil solid phase to the soil liquid phase through dissolution, desorption, and reverse complexation, followed by wastewater treatment. This technology is particularly suitable for soils used in construction sites and sandy soils. Its advantages include the ability to concentrate pollutants, simplicity, controllable cost, large processing capacity, and rapid results, making it an important means of remediating heavily contaminated soils.

[0003] A search revealed Chinese patent CN108160186B, which discloses a purification device for treating heavy metal-contaminated soil. The device includes a pretreatment unit, a filter press, a microbial treatment unit, and a baking unit. The pretreatment unit comprises a pretreatment body, a pulverizing device, and a stirring device. The pulverizing device includes pulverizing rollers and a pulverizing motor. The pulverizing rollers include an active pulverizing roller and a passive pulverizing roller, both with pulverizing teeth distributed around their circumferences. The stirring device includes a stirring motor, a stirring shaft, and spiral blades. A chemical tank is externally located on the pretreatment body, with a nozzle hinged to one side of the tank. The filter press includes a filter press body and filter press components. The outlet of the filter press is connected to the inlet of the microbial treatment unit, and the outlet of the microbial treatment unit is connected to the baking unit. This device, through the pretreatment unit, filter press, microbial treatment unit, and baking unit, can purify the soil and prevent heavy metal residues from remaining in the soil water after the reaction.

[0004] However, in actual use, the above-mentioned devices are difficult to prevent soil particles from stratifying in the vertical direction, resulting in uneven penetration of the solution. This may cause the solution concentration in some areas to be too high, leading to waste. At the same time, it may also cause heavy metals in the deep soil or between particles to be difficult to fully contact, affecting the soil purification effect. Therefore, it is necessary to propose a soil purification device for heavy metal contaminated soil. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art, which is that it is difficult to prevent soil particles from stratifying in the vertical direction, resulting in uneven penetration of the pesticide solution, which may cause excessively high pesticide concentration in some areas and lead to waste. At the same time, it is difficult for heavy metals in deep soil or between particles to be fully contacted, thus affecting the soil purification effect. Therefore, this invention proposes a soil purification device for heavy metal contaminated soil.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A soil purification device for heavy metal contamination includes a purification chamber. The purification chamber contains a stirring mechanism, which includes a rotating lead screw disposed inside the purification chamber. The rotating lead screw is fixedly connected to a second stirring rod and a fixed rod. The fixed rod is slidably connected to a fifth gear, which meshes with a fourth gear. The fourth gear is fixedly connected to a worm gear, which meshes with a turbine. The turbine is fixedly connected to a third connecting plate, which is rotatably connected to a first connecting plate. The first connecting plate is rotatably connected to a second connecting plate, and the second connecting plate is fixedly connected to a first gear. The first gear and the rotating lead screw are meshed together.

[0008] The purification box is equipped with a soil turning mechanism, which includes a second gear fixedly connected to a rotating lead screw, a third gear meshing with the second gear, a gear ring meshing with the third gear, a cylindrical pin fixedly connected to the upper part of the gear ring, a ring sleeve slidably connected to the cylindrical pin, a round block rotatably connected to the ring sleeve, and a flap fixedly connected to one side of the ring sleeve.

[0009] The ring, the round block, and the flip plate are all set in multiple groups, which facilitates the turning of the soil inside the purification box at multiple angles and reduces the stratification of the soil in the vertical direction.

[0010] The above technical solution further includes:

[0011] The rotating lead screw is movably connected to the purification box, the fifth gear is rotatably connected to the purification box, the fourth gear is rotatably connected to the purification box, the worm gear is rotatably connected to the purification box, the turbine is rotatably connected to the purification box, and the first gear is rotatably connected to the purification box.

[0012] The rotating lead screw will rise and fall inside the purification chamber and rotate simultaneously.

[0013] The purification chamber is fixedly connected to a baffle plate, the rotating screw is rotatably connected to a fixed frame, the third gear is rotatably connected to the fixed frame, a ring is fixedly connected to the upper part of the third gear, the gear ring is rotatably connected to the ring, and the circular block is fixedly connected to the ring.

[0014] A motor is fixedly installed on one side of the purification box. The output end of the motor is provided with a third rotating shaft. The third rotating shaft is fixedly connected to a second bevel gear set. The second bevel gear set is fixedly connected to a first rotating shaft. The first rotating shaft is rotatably connected to the purification box. The first rotating shaft is driven by a belt. The worm gear is driven by the belt.

[0015] A first connecting rod is fixedly connected to one side of the third rotating shaft, a second connecting rod is rotatably connected to the side of the first connecting rod away from the third rotating shaft, and a flow tube is rotatably connected to the side of the second connecting rod away from the first connecting rod. The flow tube is slidably connected to the purification box.

[0016] The flow tube is slidably connected to the purification box on both sides to ensure stability when the flow tube moves.

[0017] The purification chamber is internally fixedly connected to a rack, which is meshed with a sixth gear. The sixth gear is fixedly connected to a fourth rotating shaft, which is rotatably connected to the flow pipe.

[0018] The fourth rotating shaft is fixedly connected to the first bevel gear set, the first bevel gear set is fixedly connected to the second rotating shaft, and the second rotating shaft is rotatably connected to the flow pipe.

[0019] A medicine storage box is fixedly connected to the upper part of the flow tube. The second rotating shaft passes through the medicine storage box and extends into the interior of the medicine storage box. A first stirring rod is fixedly connected to the second rotating shaft. A medicine adding port is provided at the upper part of the second rotating shaft.

[0020] The first stirring rod facilitates stirring inside the medicine storage tank when the second rotating shaft rotates, preventing the medicine solution from settling.

[0021] A dispensing pipe is provided on one side of the medicine storage tank, a second pump body is provided at the connection between the dispensing pipe and the flow pipe, and a nozzle is provided at the lower part of the flow pipe.

[0022] The lower part of the purification box is provided with a liquid outlet pipe, and a first pump body is provided at the connection between the liquid outlet pipe and the purification box. A filter screen is provided at the inlet of the liquid outlet pipe.

[0023] The present invention has the following beneficial effects:

[0024] 1. In this invention, the stirring mechanism and the soil turning mechanism inside the purification box work together through mechanical transmission, so that the second stirring rod moves up and down while rotating and stirring, and at the same time turns the soil, breaking the vertical layer structure of the soil, promoting the uniform penetration of the liquid and improving the soil purification effect.

[0025] 2. In this invention, the first connecting rod is rotated by the third rotating shaft, which in turn causes the second connecting rod to drive the flow pipe to slide back and forth on the upper part of the purification box. This facilitates the even spraying of the medicine inside the purification box and prevents excessive local spraying of medicine, which would otherwise lead to waste.

[0026] 3. In this invention, when the flow tube reciprocates, it will drive the sixth gear and the fourth rotating shaft to rotate under the action of the rack, which will eventually drive the first stirring rod to rotate inside the medicine storage tank. This helps to prevent the medicine liquid inside the medicine storage tank from settling, affecting the uniformity of the medicine liquid, and preventing it from affecting soil purification. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a heavy metal contaminated soil purification device proposed in this invention;

[0028] Figure 2 This is a schematic diagram of the lower structure of the purification box in this invention;

[0029] Figure 3 This is a cross-sectional view of the overall structure in this invention;

[0030] Figure 4 This is a cross-sectional view of the internal structure of the purification box in this invention;

[0031] Figure 5 This is a schematic diagram of the soil-turning mechanism in this invention;

[0032] Figure 6 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0033] Figure 7 for Figure 2 Enlarged schematic diagram of the structure at point B;

[0034] Figure 8 for Figure 3 Enlarged schematic diagram of the structure at point C.

[0035] In the diagram: 1. Purification box; 2. Flow pipe; 3. Medicine storage box; 4. First rotating shaft; 5. Rotating screw; 6. Fixed rod; 7. Medicine filling port; 8. First pump body; 9. Discharge pipe; 10. First connecting plate; 11. Second connecting plate; 12. First gear; 13. Second pump body; 14. Medicine discharge pipe; 15. Guide plate; 16. Nozzle; 17. Second rotating shaft; 18. First stirring rod; 19. Second gear; 20. Third gear; 21. Fixed frame; 22. Tilting 23. Plate; 24. Ring; 25. Second stirring rod; 26. Gear ring; 27. Cylindrical pin; 28. Ring sleeve; 29. ​​Round block; 30. Motor; 31. Third rotating shaft; 32. First connecting rod; 33. Second connecting rod; 34. Belt; 35. Worm gear; 36. Fourth gear; 37. Fifth gear; 38. Turbine; 39. Third connecting plate; 40. Rack; 41. Sixth gear; 42. Fourth rotating shaft; 43. First bevel gear set; 44. Second bevel gear set. Detailed Implementation

[0036] 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.

[0037] Example 1

[0038] refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 as well as Figure 7 A heavy metal contaminated soil purification device includes a purification box 1. The purification box 1 is equipped with a stirring mechanism, which includes a rotating screw 5 disposed inside the purification box 1. A second stirring rod 24 is fixedly connected to the rotating screw 5. A fixed rod 6 is fixedly connected to the rotating screw 5. A fifth gear 36 is slidably connected to the fixed rod 6. A fourth gear 35 is meshed with the fifth gear 36. A worm gear 34 is fixedly connected to the fourth gear 35. A turbine 37 is meshed with the worm gear 34. A third connecting plate 38 is fixedly connected to the turbine 37. A first connecting plate 10 is rotatably connected to the third connecting plate 38. A second connecting plate 11 is rotatably connected to the first connecting plate 10. A first gear 12 is fixedly connected to the second connecting plate 11. The first gear 12 and the rotating screw 5 are meshed together.

[0039] The purification box 1 is equipped with a soil turning mechanism, which includes a second gear 19 fixedly connected to the rotating screw 5. The second gear 19 is meshed with a third gear 20, and the third gear 20 is meshed with a toothed ring 25. A cylindrical pin 26 is fixedly connected to the upper part of the toothed ring 25. A ring sleeve 27 is slidably connected to the cylindrical pin 26. A round block 28 is rotatably connected to the ring sleeve 27. A flap 22 is fixedly connected to one side of the ring sleeve 27.

[0040] refer to Figure 2 , Figure 4 as well as Figure 7 The screw 5 is movably connected to the purification box 1, the fifth gear 36 is rotatably connected to the purification box 1, the fourth gear 35 is rotatably connected to the purification box 1, the worm gear 34 is rotatably connected to the purification box 1, the turbine 37 is rotatably connected to the purification box 1, and the first gear 12 is rotatably connected to the purification box 1.

[0041] refer to Figure 3 , Figure 4 as well as Figure 5 The purification box 1 is fixedly connected to a baffle plate 15. The rotating screw 5 is rotatably connected to a fixed frame 21. The third gear 20 is rotatably connected to the fixed frame 21. The upper part of the third gear 20 is fixedly connected to a ring 23. The toothed ring 25 is rotatably connected to the ring 23. The round block 28 is fixedly connected to the ring 23.

[0042] refer to Figure 1 as well as Figure 6 A motor 29 is fixedly installed on one side of the purification box 1. The output end of the motor 29 is provided with a third rotating shaft 30. The third rotating shaft 30 is fixedly connected to a second bevel gear set 43. The second bevel gear set 43 is fixedly connected to a first rotating shaft 4. The first rotating shaft 4 and the purification box 1 are rotatably connected. The first rotating shaft 4 is driven by a belt 33. The worm gear 34 and the belt 33 are driven by a belt.

[0043] In this embodiment, when it is necessary to purify soil containing heavy metals, the soil containing heavy metals is placed into the purification box 1 from the top. At this time, under the action of the guide plate 15, the guide plate 15 has a certain tilt angle and is set around the bottom surface of the purification box 1. The soil containing heavy metals will slide towards the rotating screw 5. When the heavy metal removal liquid is sprayed into the purification box 1, the motor 29 is started to make the third rotating shaft 30 set at its output end rotate. The third rotating shaft 30 will drive the fixedly connected second bevel gear set 43 to rotate. The second bevel gear set 43 will make the fixedly connected first rotating shaft 4 rotate. The rotation of the first rotating shaft 4 will drive the worm gear 34 to rotate through the transmission belt 33. The rotation of the worm gear 34 will make the fixedly connected fourth gear 35 rotate.

[0044] When the fourth gear 35 rotates, it drives the meshing fifth gear 36 to rotate. The fifth gear 36 and the fixed rod 6, which is fixedly connected around the rotating lead screw 5, are in a sliding connection. The rotation of the fifth gear 36, through the engagement between the fifth gear 36 and the fixed rod 6, drives the rotating lead screw 5 to rotate. The rotation of the rotating lead screw 5, in turn, drives the second stirring rod 24, which is fixedly connected to the rotating lead screw 5, to rotate. That is, the second stirring rod 24 facilitates the stirring of the heavy metal contaminated soil added inside the purification box 1. At the same time, the rotation of the worm gear 34 also drives the meshing turbine 37 to rotate. The rotation of the turbine 37 causes the fixedly connected... The third connecting plate 38 rotates, and the rotation of the third connecting plate 38 will drive the second connecting plate 11 to rotate through the first connecting plate 10. The rotation of the second connecting plate 11 will drive the first gear 12 to rotate. Under the action of the first connecting plate 10 and the second connecting plate 11, the second pump body 13 will continuously rotate in both directions. Since the first gear 12 and the rotating screw 5 are meshed, the rotating screw 5 will eventually be driven to move up and down inside the purification box 1. That is, the second stirring rod 24 moves up and down while rotating and stirring, which helps to break up the soil stratification inside the purification box 1.

[0045] As the lead screw 5 rotates, it drives the fixedly connected second gear 19 to rotate. The second gear 19 causes the meshing third gear 20 to rotate, which in turn drives the meshing gear ring 25 to rotate. The rotation of the gear ring 25 causes the upper fixedly connected cylindrical pin 26 to rotate circumferentially. The rotating cylindrical pin 26 continuously passes through the curved groove inside the ring sleeve 27. The circular block 28 and the ring 23 are fixedly connected, meaning that the ring sleeve 27 will continuously rotate under the action of the cylindrical pin 26. At this time, the flap 22 fixedly connected to one side of the ring sleeve 27 can continuously turn over the soil, which facilitates breaking the vertical stratification structure of the soil, promotes uniform penetration of the liquid, and improves the soil purification effect.

[0046] Example 2

[0047] refer to Figure 1 as well as Figure 6 A first connecting rod 31 is fixedly connected to one side of the third rotating shaft 30. A second connecting rod 32 is rotatably connected to the side of the first connecting rod 31 away from the third rotating shaft 30. A flow pipe 2 is rotatably connected to the side of the second connecting rod 32 away from the first connecting rod 31. The flow pipe 2 and the purification box 1 are slidably connected.

[0048] refer to Figure 3 as well as Figure 8 The purification chamber 1 is internally fixedly connected to a rack 39, which is meshed with a sixth gear 40. The sixth gear 40 is fixedly connected to a fourth rotating shaft 41, which is rotatably connected to the flow pipe 2.

[0049] refer to Figure 3 as well as Figure 8 The fourth rotating shaft 41 is fixedly connected to the first bevel gear set 42, and the first bevel gear set 42 is fixedly connected to the second rotating shaft 17. The second rotating shaft 17 is rotatably connected to the flow pipe 2.

[0050] refer to Figure 1 , Figure 3 as well as Figure 8 The upper part of the flow tube 2 is fixedly connected to the medicine storage box 3. The second rotating shaft 17 passes through the medicine storage box 3 and extends into the interior of the medicine storage box 3. The second rotating shaft 17 is fixedly connected to the first stirring rod 18. The upper part of the second rotating shaft 17 is provided with a medicine adding port 7.

[0051] refer to Figure 3 A medicine outlet pipe 14 is provided on one side of the medicine storage tank 3. A second pump body 13 is provided at the connection between the medicine outlet pipe 14 and the flow pipe 2. A nozzle 16 is provided at the lower part of the flow pipe 2.

[0052] refer to Figure 2 The lower part of the purification tank 1 is provided with a liquid outlet pipe 9, and a first pump body 8 is provided at the connection between the liquid outlet pipe 9 and the purification tank 1. A filter screen is provided at the inlet of the liquid outlet pipe 9.

[0053] In this embodiment, the rotation of the third rotating shaft 30 will cause the first connecting rod 31 fixedly connected to one side to rotate. The first connecting rod 31 will rotate in a circle with the third rotating shaft 30 as the center. The first connecting rod 31 will cause the second connecting rod 32 to rotate and drive the flow pipe 2 to slide back and forth on the purification box 1. When the flow pipe 2 slides, it will cause the fourth rotating shaft 41 to slide at the same time. However, the sixth gear 40 fixedly connected to the fourth rotating shaft 41 and the rack 39 fixedly connected inside the purification box 1 are meshed. That is, when the flow pipe 2 slides, the sixth gear 40 will rotate. The rotation of the sixth gear 40 will drive the first bevel gear set 42 fixedly connected to rotate. The first bevel gear set 42 will cause the second rotating shaft 17 fixedly connected to rotate. The second rotating shaft 17 will drive the first stirring rod 18 to rotate, so that the first stirring rod 18 can stir the medicine liquid inside the medicine storage box 3 and prevent the medicine liquid from settling and affecting the removal effect of heavy metals in the soil.

[0054] The medicine inlet 7 at the top of the medicine storage tank 3 facilitates the addition of medicine to the medicine storage tank 3. When the flow pipe 2 slides back and forth, the second pump 13 is activated, which continuously sends the medicine inside the medicine storage tank 3 into the flow pipe 2 through the medicine outlet pipe 14. Finally, the medicine is evenly sprayed into various areas inside the purification tank 1 through multiple nozzles 16 at the bottom of the flow pipe 2. After purifying the soil contaminated with heavy metals, the first pump 8 at the bottom of the purification tank 1 is activated, which facilitates the discharge of the medicine mixed with heavy metals through the liquid outlet pipe 9. A filter screen is installed at the inlet of the liquid outlet pipe 9 to prevent soil from being discharged together.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heavy metal contaminated soil purification device, comprising a purification chamber (1), characterized in that: The purification box (1) is equipped with a stirring mechanism. The stirring mechanism includes a rotating screw (5) installed inside the purification box (1). The rotating screw (5) is fixedly connected to a second stirring rod (24). The rotating screw (5) is fixedly connected to a fixed rod (6). The fixed rod (6) is slidably connected to a fifth gear (36). The fifth gear (36) is meshed with a fourth gear (35). The fourth gear (35) is fixedly connected to a worm (34). The worm (34) is meshed with a worm wheel (37). The worm wheel (37) is fixedly connected to a third connecting plate (38). The third connecting plate (38) is rotatably connected to a first connecting plate (10). The first connecting plate (10) is rotatably connected to a second connecting plate (11). The second connecting plate (11) is fixedly connected to a first gear (12). The first gear (12) and the rotating screw (5) are meshed. The purification box (1) is equipped with a soil turning mechanism. The soil turning mechanism includes a second gear (19) fixedly connected to a rotating screw (5). The second gear (19) is meshed with a third gear (20). The third gear (20) is meshed with a toothed ring (25). A cylindrical pin (26) is fixedly connected to the upper part of the toothed ring (25). A ring sleeve (27) is slidably connected to the cylindrical pin (26). The ring sleeve (27) is provided with an arc-shaped groove inside. A round block (28) is rotatably connected to the ring sleeve (27). A flap plate (22) is fixedly connected to one side of the ring sleeve (27). A motor (29) is fixedly installed on one side of the purification box (1). The output end of the motor (29) is provided with a third rotating shaft (30). The third rotating shaft (30) is fixedly connected to a second bevel gear set (43). The second bevel gear set (43) is fixedly connected to a first rotating shaft (4). The first rotating shaft (4) is rotatably connected to the purification box (1). The first rotating shaft (4) is driven by a belt (33). The worm gear (34) is driven by the belt (33). A first connecting rod (31) is fixedly connected to one side of the third rotating shaft (30). A second connecting rod (32) is rotatably connected to the side of the first connecting rod (31) away from the third rotating shaft (30). A flow pipe (2) is rotatably connected to the side of the second connecting rod (32) away from the first connecting rod (31). The flow pipe (2) is slidably connected to the purification box (1).

2. The heavy metal contaminated soil purification equipment according to claim 1, characterized in that, The rotating lead screw (5) is movably connected to the purification box (1), the fifth gear (36) is rotatably connected to the purification box (1), the fourth gear (35) is rotatably connected to the purification box (1), the worm (34) is rotatably connected to the purification box (1), the worm wheel (37) is rotatably connected to the purification box (1), and the first gear (12) is rotatably connected to the purification box (1).

3. The heavy metal contaminated soil purification equipment according to claim 1, characterized in that, The purification box (1) is fixedly connected to a flow guide plate (15), the rotating screw (5) is rotatably connected to a fixed frame (21), the third gear (20) is rotatably connected to the fixed frame (21), the upper part of the third gear (20) is fixedly connected to a ring (23), the gear ring (25) is rotatably connected to the ring (23), and the round block (28) is fixedly connected to the ring (23).

4. The heavy metal contaminated soil purification equipment according to claim 1, characterized in that, The purification box (1) is fixedly connected to a rack (39), which is meshed with a sixth gear (40). The sixth gear (40) is fixedly connected to a fourth rotating shaft (41), which is rotatably connected to the flow pipe (2).

5. The heavy metal contaminated soil purification equipment according to claim 4, characterized in that, The fourth rotating shaft (41) is fixedly connected to the first bevel gear set (42), and the first bevel gear set (42) is fixedly connected to the second rotating shaft (17). The second rotating shaft (17) and the flow pipe (2) are rotatably connected.

6. The heavy metal contaminated soil purification equipment according to claim 5, characterized in that, The upper part of the flow tube (2) is fixedly connected to a medicine storage box (3), the second rotating shaft (17) passes through the medicine storage box (3) and extends into the interior of the medicine storage box (3), the second rotating shaft (17) is fixedly connected to a first stirring rod (18), and the top of the medicine storage box (3) is provided with a medicine filling port (7).

7. The heavy metal contaminated soil purification equipment according to claim 6, characterized in that, A medicine outlet pipe (14) is provided on one side of the medicine storage tank (3), a second pump body (13) is provided at the connection between the medicine outlet pipe (14) and the flow pipe (2), and a nozzle (16) is provided at the lower part of the flow pipe (2).

8. The heavy metal contaminated soil purification equipment according to claim 7, characterized in that, The lower part of the purification box (1) is provided with a liquid outlet pipe (9), and a first pump body (8) is provided at the connection between the liquid outlet pipe (9) and the purification box (1). A filter screen is provided at the inlet of the liquid outlet pipe (9).

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