Recycling device for purified water preparation

Abstract

The utility model discloses a recovery device for purified water preparation, which belongs to the technical field of purified water preparation and comprises a storage tank, a water replenishing pipe is fixedly communicated with the bottom of the outer surface of the storage tank, the top end of the water replenishing pipe is communicated with a drain outlet of purified water preparation equipment, and a drain pipe is fixedly communicated with the lower end face of the storage tank. The tail end of the drainage pipe is connected with a water using device; a pressure device is arranged at the upper part in the storage box. When the device is used, sewage is continuously discharged from the sewage outlet of the purified water preparation equipment, the sewage enters the storage tank through the water supplementing pipe, the water level of the sewage in the storage tank continuously rises, then the pressure device is forced to store pressure, and when the water level of the sewage reaches the top end of the overflow pipe, the sewage in the storage tank overflows from the overflow pipe; the water level of the sewage in the storage tank does not rise any more; when the water is used, the faucet is opened, the water in the storage tank is discharged from the drainage pipe under the pushing of the pressure device and is discharged from the faucet, and water taking is completed.

Description

Technical Field

[0001] This utility model belongs to the technical field of pure water preparation, and in particular relates to a recycling device for pure water preparation. Background Technology

[0002] Equipment for producing pure water primarily employs reverse osmosis technology. Raw water is pressurized by a high-pressure pump, forcing it through the micropores of the reverse osmosis membrane, thus purifying the water. The technical principle of reverse osmosis membranes is that, under pressure higher than the osmotic pressure of the solution, other substances cannot pass through the semi-permeable membrane, thus separating these substances from the water. Pressurized raw water enters one side of the reverse osmosis membrane, permeates the membrane to become pure water, and becomes high-concentration wastewater on the other side before being discharged from the drain outlet. The drain outlet requires a set back pressure. The inflow of pressurized raw water and the discharge of high-concentration wastewater is a continuous dynamic balance process; therefore, the back pressure at the drain outlet can regulate the output water rate of the pure water production equipment. The output water rate refers to the ratio of the produced pure water to the corresponding amount of raw water entering the membrane.

[0003] Existing equipment for producing purified water includes a high-concentration wastewater recovery system. High-concentration wastewater refers to concentrated water containing high concentrations of inorganic salts such as calcium and magnesium ions. This wastewater is non-toxic and harmless, posing no threat to the environment. Therefore, the recovered wastewater can be directly used for flushing toilets or watering plants. However, existing recovery systems lack the ability to provide a pressure-controlled water supply. An additional pump or similar power source is required to extract the wastewater from the recovery system, increasing both operating and manufacturing costs. Utility Model Content

[0004] The purpose of this invention is to provide a recycling device for pure water preparation, which has the function of providing a stable water supply at a set pressure, effectively solving the problem that the recycling device of the existing pure water preparation equipment does not provide pressurized water.

[0005] The present invention adopts the following technical solution: a recycling device for pure water preparation, which is installed on a pure water preparation device, includes a storage tank, a water supply pipe is fixedly connected to the bottom of the outer surface of the storage tank, the top end of the water supply pipe is connected to the sewage outlet of the pure water preparation device, a drain pipe is fixedly connected to the lower end of the storage tank, and a water-using device is connected to the end of the drain pipe; a pressure device is installed in the upper part of the storage tank, which continuously applies pressure to the sewage in the lower part of the storage tank, and an overflow pipe is fixedly installed in the upper part of the outer surface of the storage tank.

[0006] Furthermore, the pressure device includes a pressure plate that is slidably disposed in the storage box in the vertical direction. The storage box is a box structure, including a top plate, a bottom plate, and side plates, and a storage space is formed between the top plate, the bottom plate, and the side plates. The outer side wall of the pressure plate is in contact with the inner side wall of the corresponding side plate, and a pressure spring is fixedly disposed between the pressure plate and the lower end face of the top plate of the storage box.

[0007] Furthermore, the top plate of the storage box is slidably disposed between the four side plates in the vertical direction, and a fixing plate is fixedly disposed above the four side plates. An adjusting nut is rotatably connected inside the fixing plate, and a threaded rod is threadedly connected inside the adjusting nut. The bottom end of the threaded rod is fixedly disposed with the top plate.

[0008] Furthermore, a shut-off valve is installed on the water supply pipe.

[0009] Furthermore, a scraper is slidably provided on the inner bottom wall of the storage box, a pull rod is fixedly provided on the inner side of the scraper, and a sealing plate is fixedly provided on the outer end of the pull rod; the inner side wall of the storage box has a receiving groove adapted to the scraper and a through hole adapted to the sealing plate; when the sealing plate is located in the through hole, the scraper is located in the receiving groove, the inner side of the scraper coincides with the inner side wall of the storage box, and the inner side of the sealing plate coincides with the inner side wall of the storage box; the lower end face of the pressure plate has an avoidance groove adapted to the pull rod; two clamping plates are fixedly provided on the outer side of the storage box at positions corresponding to the sealing plate, and when the sealing plate moves outward, both ends of the sealing plate are slidably disposed with the two clamping plates.

[0010] Furthermore, a sealing strip is fixedly embedded on the outer side of the pressure plate, and each sealing strip is in contact with the inner wall of the storage box.

[0011] Furthermore, an L-shaped rod is fixedly installed on the outer side of the sealing plate, and a fixing bolt is threaded through the vertical part of the L-shaped rod and connected to the storage box by threads.

[0012] Furthermore, the pure water preparation equipment includes several primary filters and reverse osmosis membrane modules, all installed within a frame. The inlet end of the primary filter is connected to the inlet pipe, and the top end of the primary filter is connected to the inlet end of the reverse osmosis membrane module via a connecting pipe. The left end of the reverse osmosis membrane module is fixedly connected to an outlet pipe.

[0013] Furthermore, the reverse osmosis membrane assembly includes two reverse osmosis outer tubes, each of which has a central tube fixedly installed coaxially. The two central tubes are fixedly connected to the outlet pipe. A reverse osmosis membrane is installed between each reverse osmosis outer tube and the central tube. The end of the connecting pipe away from the primary filter is fixedly connected to the right end of the upper reverse osmosis outer tube.

[0014] Furthermore, an intermediate pipe is fixedly installed between the upper and lower reverse osmosis membrane outer tubes. The top end of the intermediate pipe is connected to the drain outlet of the upper reverse osmosis membrane outer tube, and the bottom end of the intermediate pipe is connected to the right end of the lower reverse osmosis membrane outer tube. The left ends of the central tubes of both reverse osmosis membranes are connected to the water outlet pipe, and the drain outlet of the lower reverse osmosis membrane outer tube is fixedly connected to the water supply pipe.

[0015] I. This utility model, by setting up a storage tank and a pressure device, allows for the continuous discharge of wastewater from the drain outlet of the pure water preparation equipment during use. The wastewater enters the storage tank through the water supply pipe, causing the water level inside the storage tank to rise continuously. This forces the pressure device to store pressure. When the wastewater level reaches the top of the overflow pipe, the wastewater in the storage tank overflows from the overflow pipe, and the water level in the storage tank stops rising. When water is needed, the faucet is turned on, and the water in the storage tank is discharged from the drain pipe under the pressure of the pressure device and then discharged from the faucet, completing the water dispensing process.

[0016] II. By setting an adjusting nut, a threaded rod, and a top plate, this utility model allows the adjusting nut to rotate and drive the threaded rod to move up and down during use, which in turn drives the top plate to move up and down, thereby adjusting the preload of the pressure spring and thus adjusting the back pressure of the drain outlet of the pure water preparation equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0018] Figure 2 This is a three-dimensional structural diagram of the storage box in this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the lower reverse osmosis membrane outer tube in this utility model.

[0020] Figure 4 This is a three-dimensional structural diagram of the water supply pipe in this utility model;

[0021] Figure 5 This is a three-dimensional structural diagram of the overflow pipe in this utility model;

[0022] Figure 6 This is a schematic diagram of the internal three-dimensional structure of the storage box in this utility model;

[0023] Figure 7 This is a three-dimensional structural diagram of the tie rod in this utility model;

[0024] Figure 8 This is a three-dimensional structural diagram of the sealing plate and scraper in the present invention when they are pulled out.

[0025] Figure 9This is a three-dimensional structural diagram of the scraper in this utility model.

[0026] In the diagram, 1. Pure water preparation equipment; 2. Storage tank; 3. Water supply pipe; 4. Drain pipe; 5. Overflow pipe; 6. Pressure plate; 7. Top plate; 8. Bottom plate; 9. Pressure spring; 10. Fixing plate; 11. Adjusting nut; 12. Threaded rod; 13. Shut-off valve; 14. Scraper; 15. Pull rod; 16. Sealing plate; 17. Receiving groove; 18. Through hole; 19. Avoidance groove; 20. Clamping plate; 21. Sealing strip; 22. L-rod; 23. Fixing bolt; 24. Primary filter; 25. Inlet pipe; 26. Connecting pipe; 27. Reverse osmosis membrane outer tube; 28. Central tube; 29. ​​Intermediate pipe; 30. Outlet pipe. Detailed Implementation

[0027] Please see Figure 1-9 The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0028] The purified water preparation and recycling device of this utility model is installed on a purified water preparation equipment 1, including a storage tank 2. A water supply pipe 3 is fixedly connected to the bottom of the outer surface of the storage tank 2. The top end of the water supply pipe 3 is connected to the sewage outlet of the purified water preparation equipment 1. A drain pipe 4 is fixedly connected to the lower end of the storage tank 2. The end of the drain pipe 4 is connected to a water-using device, such as a toilet or faucet, so that water can be obtained by opening the faucet for watering plants. A pressure device is installed in the upper part of the storage tank 2. The pressure device continuously applies pressure to the sewage in the lower part of the storage tank 2, so that the water in the storage tank 2 can provide water at a set pressure through the drain pipe 4. An overflow pipe 5 is fixedly installed in the upper part of the outer surface of the storage tank 2. In normal use, the wastewater discharge port of the pure water preparation equipment 1 continuously discharges wastewater. The wastewater enters the storage tank 2 through the water supply pipe 3, and the water level inside the storage tank 2 continues to rise, which forces the pressure device to store pressure. When the wastewater level reaches the top of the overflow pipe 5, the wastewater in the storage tank 2 overflows from the overflow pipe 5, and the water level in the storage tank 2 no longer rises. The pressure device and the pressure of the wastewater in the storage tank 2 are in balance. When water is used, the faucet is turned on, and the water in the storage tank 2 is discharged from the drain pipe 4 under the push of the pressure device and discharged from the faucet, completing the water intake. When taking water, the water pressure comes from the pressure device and also from the water supply pressure of the water supply pipe 3.

[0029] In addition, since the sewage pressure in storage tank 2 can only be balanced with the pressure of the pressure device when it reaches the set pressure, the sewage level in storage tank 2 is at the top of the overflow pipe 5. Therefore, there is a set back pressure at the sewage outlet of pure water preparation equipment 1, which causes the sewage in pure water preparation equipment 1 to overcome the back pressure and be discharged into storage tank 2. As a result, the output rate of pure water preparation equipment 1 is improved. The output rate refers to the ratio of purified water discharged by pure water preparation equipment 1 to raw water. The raw water is water that is pumped into pure water preparation equipment 1 by a pressure water pump to be treated.

[0030] The wastewater is concentrated water containing high concentrations of inorganic salts such as calcium and magnesium ions. It is non-toxic and harmless and will not cause harm to the environment.

[0031] In this embodiment, the pressure device includes a pressure plate 6 that is slidably disposed within the storage tank 2 in the vertical direction. The storage tank 2 is a box structure, including a top plate 7, a bottom plate 8, and side plates, forming a storage space between the top plate 7, the bottom plate 8, and the side plates. The outer side walls of the pressure plate 6 are in contact with the inner side walls of the corresponding side plates. A pressure spring 9 is fixedly disposed between the pressure plate 6 and the lower end face of the top plate 7 of the storage tank 2. During normal use, the sewage in the water supply pipe 3 is continuously discharged into the space below the pressure plate 6 in the storage tank 2. As the sewage pressure in the storage tank 2 increases, it continuously pushes the pressure plate 6 upward, causing the pressure to rise. The pressure plate 6 compresses the pressure spring 9; when the water level of the sewage in the storage tank 2 rises to the top of the overflow pipe 5, the sewage in the storage tank 2 overflows from the overflow pipe 5, the pressure of the sewage in the storage tank 2 decreases, and the pressure spring 9 pushes the pressure plate 6 downward. When the pressure plate 6 moves to below the top of the overflow pipe 5, it stops moving. At this time, the pressure of the sewage in the storage tank 2 rises again, pushing the pressure plate 6 upward. When the pressure plate 6 moves upward to above the top of the overflow pipe 5, the sewage in the storage tank 2 overflows from the top of the overflow pipe 5. This process repeats to form a dynamic balance.

[0032] When water is used, such as when flushing the toilet or taking water from the faucet, the wastewater in the storage tank 2 flows into the toilet's flushing tank or is discharged from the faucet through the drain pipe 4 under the pressure of the pressure plate 6 and the water supply pressure of the water supply pipe 3. At this time, the water level of the wastewater in the storage tank 2 continues to drop as water is used. When water is stopped, the water level of the wastewater in the storage tank 2 rises again to reach a dynamic equilibrium.

[0033] In order to achieve the purpose of adjusting the preload of the pressure spring 9, in this embodiment, the top plate 7 of the storage box 2 is slidably disposed between the four side plates in the vertical direction, and a fixing plate 10 is fixedly disposed above the four side plates. An adjusting nut 11 is rotatably connected inside the fixing plate 10, and a threaded rod 12 is threadedly connected inside the adjusting nut 11. The bottom end of the threaded rod 12 is fixedly disposed with the top plate 7.

[0034] After the water level in storage tank 2 reaches dynamic equilibrium, the thrust of pressure spring 9 becomes the back pressure at the drain outlet of pure water preparation equipment 1. During normal use, this back pressure affects the water output rate and efficiency of pure water preparation equipment 1. The water output rate and efficiency are negatively correlated; therefore, both need to be considered during production. If the water output rate is too high, the efficiency will be too low. In this case, the preload of pressure spring 9 can be reduced by rotating adjusting nut 11, thereby lowering the back pressure at the drain outlet of pure water preparation equipment 1. The wastewater discharge is easier, the raw water utilization rate is low, but the effluent efficiency is higher, meaning the output of pure water is higher, but more wastewater is also generated. Conversely, if the effluent rate is too low, the effluent efficiency will be too high. In this case, the preload of the pressure spring 9 can be increased by rotating the adjusting nut 11, which increases the back pressure at the discharge port of the pure water preparation equipment 1. The wastewater discharge needs to overcome a greater back pressure, resulting in a higher raw water utilization rate, but a lower effluent efficiency, meaning the output of pure water is lower, but less wastewater is generated. Adjustments can be made according to the actual situation.

[0035] In this embodiment, a shut-off valve 13 is installed on the water supply pipe 3; the shut-off valve 13 realizes the purpose of allowing water to flow through and shut off the water supply pipe 3.

[0036] After prolonged use, foreign objects tend to accumulate on the side walls of storage box 2. To address this issue:

[0037] In this embodiment, a scraper 14 is slidably provided on the inner bottom wall of the storage box 2, a pull rod 15 is fixedly provided on the inner side of the scraper 14, and a sealing plate 16 is fixedly provided on the outer end of the pull rod 15; the inner side wall of the storage box 2 is provided with a receiving groove 17 adapted to the scraper 14 and a through hole 18 adapted to the sealing plate 16; when the sealing plate 16 is located in the through hole 18, the scraper 14 is located in the receiving groove 17, the inner side of the scraper 14 coincides with the inner side wall of the storage box 2, and the inner side of the sealing plate 16 coincides with the inner side wall of the storage box 2; the lower end face of the pressure plate 6 is provided with an avoidance groove 19 adapted to the pull rod 15; two clamping plates 20 are fixedly provided on the outer side of the storage box 2 at positions corresponding to the sealing plate 16, and when the sealing plate 16 moves outward, both ends of the sealing plate 16 are slidably provided with the two clamping plates 20.

[0038] During prolonged use of storage tank 2, the inner wall of storage tank 2 needs to be cleaned periodically. During cleaning, stop the pure water preparation, then close the shut-off valve 13, and then open the faucet to drain the water. As the water drains, the pressure plate 6 slides downwards under the push of the pressure spring 9. The outer wall of the pressure plate 6 scrapes against the inner wall of storage tank 2. When the water in storage tank 2 is drained, the elasticity of the pressure spring 9 is completely released. There is still a set distance between the pressure plate 6 and the inner bottom wall of storage tank 2. At this point, by rotating the adjusting nut 11, the adjusting nut 11 rotates, causing the threaded rod 12 and the top plate 7 to move downwards, further pushing the pressure plate 6 downwards until... The lower end face of the pressure plate 6 contacts the inner bottom wall of the storage box 2. At this time, the pull rod 15 is located in the avoidance groove 19 of the pressure plate 6, and the pressure plate 6 has completed the scraping and cleaning of the inner side of the side plate. Then, the adjusting nut 11 is turned to drive the pressure plate 6 to move upward. Then, the sealing plate 16 is manually pulled outward, so that the sealing plate 16 drives the scraper 14 outward through the pull rod 15, so that the scraper 14 physically scrapes the inner bottom wall of the storage box 2 until the scraper 14 scrapes the foreign objects on the inner bottom wall of the storage box 2 out of the through hole 18 of the storage box 2, thus cleaning the storage box 2. The above process can be repeated, filling and draining water into the storage box 2, repeating this process until the storage box 2 is cleaned. Then, the sealing plate 16 is pushed inward, so that the sealing plate 16 drives the scraper 14 inward through the pull rod 15 until the scraper 14 enters the receiving groove 17 of the storage box 2 and the sealing plate 16 enters the through hole 18 of the storage box 2; the cleaning is completed.

[0039] In this embodiment, a sealing strip 21 is fixedly embedded on the outer side of the pressure plate 6, and each sealing strip 21 contacts the inner wall of the storage tank 2. When the pressure plate 6 moves downward, the pressure plate 6 scrapes and cleans the inner wall of the storage tank 2 through the sealing strip 21. The pressure plate 6 and the pressure spring 9 work together to provide water supply at a set pressure, and at the same time clean the inner wall of the storage tank 2.

[0040] In this embodiment, an L-rod 22 is fixedly provided on the outer side of the sealing plate 16, and a fixing bolt 23 is passed through the vertical part of the L-rod 22. The fixing bolt 23 is threadedly connected to the storage box 2. The purpose of fixing the sealing plate 16 is achieved by fixing the L-rod 22 with the fixing bolt 23, thereby fixing the position of the scraper 14.

[0041] In this embodiment, the pure water preparation equipment 1 includes several primary filters 24 and a reverse osmosis membrane assembly, all housed within a frame. The inlet end of each primary filter 24 is connected to an inlet pipe 25, and the top end of each primary filter 24 is connected to the inlet end of the reverse osmosis membrane assembly via a connecting pipe 26. The reverse osmosis membrane assembly includes two external reverse osmosis membrane tubes 27, each containing a coaxially fixed central tube 28. A reverse osmosis membrane is disposed between each external reverse osmosis membrane tube 27 and the central tube 28. The connecting pipe 26 is located away from the primary filter. One end of the primary filter 24 is fixedly connected to the right end of the upper reverse osmosis membrane outer tube 27; an intermediate pipe 29 is fixedly installed between the upper and lower reverse osmosis membrane outer tubes 27, the top end of the intermediate pipe 29 is connected to the drain port of the upper reverse osmosis membrane outer tube 27, and the bottom end of the intermediate pipe 29 is connected to the right end of the lower reverse osmosis membrane outer tube 27; the left ends of the central tubes 28 of the two reverse osmosis membranes are both connected to the outlet pipe 30, and the drain port of the lower reverse osmosis membrane outer tube 27 is fixedly connected to the water supply pipe 3.

[0042] The working principle of the reverse osmosis membrane is based on existing technology and will be briefly described here: Water on one side of the reverse osmosis membrane is pressurized, forcing it to penetrate the membrane. The water that penetrates the membrane is pure water, while the remaining water is high-concentration wastewater. Specifically, an annular space is formed between the outer tube 27 and the central tube 28 of the reverse osmosis membrane. The reverse osmosis membrane is installed within this annular space. The membrane has a cylindrical structure, meaning it is rolled into a cylinder and fitted onto the central tube 28. Pressurized water enters from the right end of the upper outer tube 27 and passes through the cylindrical reverse osmosis membrane for filtration. The clean water enters the central tube 28, while the water remaining on the outside of the membrane is high-concentration wastewater. This wastewater enters the lower outer tube 27 through the middle pipe 29 for further reverse osmosis filtration. Finally, the high-concentration water remaining on the outside of the membrane is discharged from the water supply pipe 3 into the storage tank 2, while the pure water in the central tube 28 is discharged from the outlet pipe 30. The upper and lower outer tubes 27 of the reverse osmosis membrane are connected in series, which improves the filtration effect.

[0043] The working principle of this utility model is as follows: The sewage outlet of the pure water preparation equipment 1 continuously discharges sewage. The sewage enters the storage tank 2 through the water supply pipe 3. The water level of the sewage inside the storage tank 2 continues to rise, which forces the pressure plate 6 to move upward and compress the pressure spring 9. When the sewage level reaches the top of the overflow pipe 5, the sewage in the storage tank 2 overflows from the overflow pipe 5, and the sewage level in the storage tank 2 no longer rises. The pressure spring 9 and the pressure of the sewage in the storage tank 2 are balanced. When water is used, the faucet is turned on, and the water in the storage tank 2 is discharged from the drain pipe 4 under the push of the pressure device and discharged from the faucet, thus completing the water intake.

[0044] During prolonged use of storage tank 2, the inner wall of storage tank 2 needs to be cleaned periodically. During cleaning, stop the pure water preparation, then close the shut-off valve 13, and then open the faucet to drain the water. As the water drains, the pressure plate 6 slides downwards under the push of the pressure spring 9. The outer wall of the pressure plate 6 scrapes against the inner wall of storage tank 2. When the water in storage tank 2 is drained, the elasticity of the pressure spring 9 is completely released. There is still a set distance between the pressure plate 6 and the inner bottom wall of storage tank 2. At this point, by rotating the adjusting nut 11, the adjusting nut 11 rotates, causing the threaded rod 12 and the top plate 7 to move downwards, further pushing the pressure plate 6 downwards until... The lower end face of the pressure plate 6 contacts the inner bottom wall of the storage box 2. At this time, the pull rod 15 is located in the avoidance groove 19 of the pressure plate 6, and the pressure plate 6 has completed the scraping and cleaning of the inner side of the side plate. Then, the adjusting nut 11 is turned to drive the pressure plate 6 to move upward. Then, the sealing plate 16 is manually pulled outward, so that the sealing plate 16 drives the scraper 14 outward through the pull rod 15, so that the scraper 14 physically scrapes the inner bottom wall of the storage box 2 until the scraper 14 scrapes the foreign objects on the inner bottom wall of the storage box 2 out of the through hole 18 of the storage box 2, thus cleaning the storage box 2. The above process can be repeated, filling and draining water into the storage box 2, repeating this process until the storage box 2 is cleaned. Then, the sealing plate 16 is pushed inward, so that the sealing plate 16 drives the scraper 14 inward through the pull rod 15 until the scraper 14 enters the receiving groove 17 of the storage box 2 and the sealing plate 16 enters the through hole 18 of the storage box 2; the cleaning is completed.

Claims

1. A recovery device for the production of purified water, provided on a purified water production plant (1), characterized in that: The utility model provides a water supplementing device, which comprises a storage tank (2), a water supplementing pipe (3) fixedly communicated with the bottom of the outer surface of the storage tank (2), a sewage outlet of a pure water preparation device (1) communicated with the top end of the water supplementing pipe (3), a drainage pipe (4) fixedly communicated with the lower end surface of the storage tank (2), and a water using device connected to the tail end of the drainage pipe (4).

2. The recovery device for pure water production according to claim 1, characterized in that: The pressure device comprises a pressure plate (6) slidingly arranged in the storage tank (2) in the up-down direction, wherein the storage tank (2) is a box structure comprising a top plate (7), a bottom plate (8) and side plates, and a storage space is formed between the top plate (7), the bottom plate (8) and the side plates; the outer side walls of the pressure plate (6) are in contact with the inner side walls of the corresponding side plates, and a pressure spring (9) is fixedly arranged between the pressure plate (6) and the lower end surface of the top plate (7) of the storage tank (2).

3. The recovery device for pure water production according to claim 2, characterized in that: The top plate (7) of the storage tank (2) is slidingly arranged between the four side plates in the up-down direction, a fixed plate (10) is fixedly arranged above the four side plates, an adjusting nut (11) is rotatably connected in the fixed plate (10), a threaded rod (12) is threadedly connected in the adjusting nut (11), and the bottom end of the threaded rod (12) is fixedly arranged with the top plate (7).

4. The recovery device for pure water production according to claim 3, characterized in that: A stop valve (13) is arranged on the water supplementing pipe (3).

5. The recovery device for pure water production according to claim 4, characterized in that: The inner bottom wall of the storage tank (2) is slidingly arranged with a scraper (14), the inner side surface of the scraper (14) is fixedly arranged with a pull rod (15), the outer end of the pull rod (15) is fixedly arranged with a sealing plate (16), the inner side wall of the storage tank (2) is provided with a containing groove (17) matched with the scraper (14) and a through hole (18) matched with the sealing plate (16), when the sealing plate (16) is located in the through hole (18), the scraper (14) is located in the containing groove (17), the inner side surface of the scraper (14) is coincident with the inner side wall of the storage tank (2), the inner side surface of the sealing plate (16) is coincident with the inner side wall of the storage tank (2), the lower end surface of the pressure plate (6) is provided with an avoidance groove (19) matched with the pull rod (15), and the outer side surface of the storage tank (2) is fixedly arranged with two clamping plates (20) corresponding to the sealing plate (16), when the sealing plate (16) moves outward, the two ends of the sealing plate (16) are slidingly arranged with the two clamping plates (20).

6. The recovery device for pure water production according to claim 2, characterized in that: The outer side surface of the pressure plate (6) is fixedly embedded with a sealing strip (21), and each sealing strip (21) is in contact with the inner side wall of the storage tank (2).

7. The recovery device for pure water production according to claim 5, characterized in that: The outer side surface of the sealing plate (16) is fixedly arranged with an L-shaped rod (22), the vertical part of the L-shaped rod (22) is penetrated with a fixing bolt (23), and the fixing bolt (23) is threadedly connected with the storage tank (2).

8. The recovery device for pure water production according to claim 1, characterized in that: The pure water preparation equipment (1) comprises a plurality of primary filters (24) and a reverse osmosis membrane assembly arranged in a rack.

9. The recovery device for pure water production according to claim 8, characterized in that: The reverse osmosis membrane assembly comprises two reverse osmosis membrane outer pipes (27), each of which is coaxially fixed with a center pipe (28), the two center pipes (28) are fixedly communicated with the water outlet pipe (30), and a reverse osmosis membrane is arranged between each reverse osmosis membrane outer pipe (27) and the center pipe (28).

10. The recovery device for pure water production according to claim 9, characterized in that: The upper reverse osmosis membrane outer pipe (27) and the lower reverse osmosis membrane outer pipe (27) are fixedly provided with an intermediate pipe (29), the top end of the intermediate pipe (29) is communicated with the blowdown port of the upper reverse osmosis membrane outer pipe (27), the bottom end of the intermediate pipe (29) is communicated with the right end of the lower reverse osmosis membrane outer pipe (27), the left end of the center pipe (28) of the two reverse osmosis membranes is communicated with the water outlet pipe (30), and the blowdown port of the lower reverse osmosis membrane outer pipe (27) is fixedly communicated with the water supplement pipe (3).

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