A device for vacuum detection and precise leak location of reverse osmosis membrane elements

Abstract

This invention relates to the field of reverse osmosis membrane testing equipment technology, and discloses a vacuum testing and leak-precision location device for reverse osmosis membrane elements, including a base plate. In this invention, a water storage buffer tank and a vacuum water vapor separator are added to the vacuum testing pipeline, which can effectively intercept and collect residual liquid precipitated from the wet membrane guide cloth, achieving water vapor separation, preventing liquid from entering the vacuum pump, protecting the testing equipment, and extending the equipment's service life. A dual judgment method combining vacuum numerical quantitative monitoring with visual observation of foaming is adopted, overcoming the limitations of subjective manual judgment, effectively simplifying the testing process, improving equipment integration, and increasing batch testing efficiency. The device pipeline uses a combination connection structure of quick-connect couplings and compression fitting seals, which can quickly complete the clamping and disassembly of membrane elements. At the same time, the compression fitting seal structure effectively ensures the sealing of the pipeline connection, avoiding vacuum degree detection errors caused by pipeline leakage, thus improving operational efficiency while ensuring the overall testing accuracy.

Description

Technical Field

[0001] This invention relates to the field of reverse osmosis membrane testing equipment technology, specifically a vacuum testing and leak-precision location device for reverse osmosis membrane elements. Background Technology

[0002] Reverse osmosis membrane elements are core filtration components in water treatment systems such as pure water production, seawater desalination, and advanced industrial wastewater treatment. The integrity of the membrane and the sealing of the sealant directly determine the quality of the produced water, desalination efficiency, and operational stability of the entire water treatment system. During production, assembly, transportation, storage, and use, reverse osmosis membrane elements are prone to defects such as pinhole damage, membrane fiber breakage, and sealant cracking and leakage. If leaks cannot be accurately detected and located, the desalination rate of the membrane element will drop significantly, impurities will penetrate the filtration layer, resulting in substandard produced water quality and, in severe cases, causing the entire water treatment equipment to shut down. Therefore, integrity testing and accurate leak location during factory quality inspection and maintenance are crucial processes for ensuring the quality of the membrane elements and the stable operation of the system.

[0003] Among the existing publicly available testing technologies, CN218485650U, CN105372261A, and CN206184273U are the closest prior art to the vacuum testing and leak location scheme of this application. All three are applied in the field of reverse osmosis membrane element integrity testing. The specific technical defects of each prior art scheme are as follows: The core technical solution of the proposed solution, disclosed in CN218485650U, is as follows: by sealing both ends of the reverse osmosis membrane element, negative pressure is drawn into the central tube of the membrane element's permeate. After the negative pressure stabilizes, the vacuum pump is turned off, and the pressure drop change of the vacuum degree inside the tube is continuously monitored. Based on whether the vacuum pressure drop value exceeds the preset threshold, it is determined whether the membrane element has structural defects such as membrane breakage, glue seam leakage, or membrane pinhole leakage, thereby achieving the screening of good and bad products of the membrane element as a whole.

[0004] The core technical solution of the proposed solution, disclosed in CN105372261A, involves configuring a carbon dioxide gas source, an inflation connector, a blind plug, and acid-base color-changing test strips. The inflation connector is connected to the first end of the central tube of the membrane element, and the second end of the central tube is sealed by the blind plug. Acid-base test strips that react with carbon dioxide and change color are placed on the end face of the membrane element to be tested. Carbon dioxide gas is injected into the membrane element, and the leakage area is identified by combining the color-changing characteristics of the test strips. At the same time, a camera and an industrial control computer are used to collect images of the test strips to complete the auxiliary determination of the leak point.

[0005] The core technical solution of the proposed solution, disclosed in CN206184273U, is as follows: the membrane element is completely fixed inside the liquid in the detection tank by a bracket, the water inlet end of the central tube of the membrane element is sealed by an air inlet connector, the concentrate end is sealed by an end cap plug, so that the membrane fiber end of the membrane element is connected to the water body, compressed air is injected into the membrane element through a compressed air pipe, and the location of membrane fiber damage and leakage is determined by visually observing the location of the bubbles overflowing from the end of the product water pipe and the surface of the membrane.

[0006] The existing technology has the following technical drawbacks: First, it can only determine the overall defects of the entire membrane element, and cannot identify or locate specific leak points and leakage areas. The leak point location function is lacking, requiring additional location equipment for subsequent auxiliary detection. This results in poor equipment reusability, cumbersome testing procedures, and a significant reduction in overall testing efficiency. Second, it can only detect dry membrane elements that have not been tested with water or have not been used. Residual liquid in wet membrane elements will be drawn into the vacuum pump, affecting equipment operation.

[0007] Furthermore, existing leak location methods have the following drawbacks: First, the equipment has poor safety and stability, relying on pressure vessels such as high-pressure carbon dioxide storage tanks for detection, posing a high-pressure leakage safety hazard during equipment deployment and use. Second, it requires pre-determining membrane element defects using vacuum testing equipment before transferring the membrane element to the location equipment for separate operation, resulting in fragmented testing processes and increased manpower due to cross-equipment transfer operations, significantly reducing batch testing efficiency. Third, observing and locating leaks in water is quite difficult. The carbon dioxide color change method, however, cannot be directly observed because carbon dioxide gas, and the color change of the test paper during gas flow and dispersion only provides a general area for leak detection, failing to pinpoint the exact location. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a vacuum detection and leak point precise location device for reverse osmosis membrane elements, which solves the problems of separation between overall detection and leak point location, poor adaptability to detection conditions, low positioning accuracy, insufficient equipment safety, cumbersome detection procedures, and low degree of automation in existing reverse osmosis membrane element detection technologies.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solution: a vacuum detection and leak point precise positioning device for reverse osmosis membrane elements, including a base plate, wherein a quick-release assembly is provided on the base plate, and the quick-release assembly is used for quick disassembly and assembly of the valve body; The quick-release assembly includes a sleeve, a first ball valve, a third ball valve, and a second ball valve. Insertion tubes are fixedly connected to both ends of the first, third, and second ball valves. The sleeve is slidably connected to the insertion tubes. Multiple rolling grooves are evenly distributed around the circumference of the sleeve, and ball bearings are installed within these grooves. The outer wall of the insertion tube has a retaining groove, an installation groove, and a fixing groove, with the ball bearings engaging with the retaining grooves. Multiple placement grooves are evenly distributed around the circumference of the retaining grooves, and a compression plate is installed within each placement groove. A gas storage ring is fixedly connected within the fixing groove, and a cavity is formed within the gas storage ring. A piston ring is slidably connected within the cavity. Multiple connecting rods are evenly distributed near the retaining groove end of the piston ring, and the connecting rods are fixedly connected to the compression plate. The ball bearings abut against the compression plate.

[0010] Preferably, the outer wall of the sleeve is provided with a sliding groove, a slider is slidably connected in the sliding groove, a push ring is slidably connected to the outer wall of the sleeve, and the slider and the push ring are fixedly connected.

[0011] Preferably, a limiting ring is fixedly connected to the outer wall of the sleeve, and a return spring is sleeved on the outer wall of the sleeve, with the return spring positioned between the push ring and the limiting ring.

[0012] Preferably, a hollow sealing ring is installed in the mounting groove, and an air inlet pipe is fixedly connected to one end of the air storage ring near the hollow sealing ring. The hollow sealing ring and the air storage ring are connected through the air inlet pipe. A compression spring is installed inside the air storage ring, and the compression spring abuts against the piston ring.

[0013] Preferably, the outer wall of the insertion tube is provided with a rotating groove, a threaded tube is rotatably connected in the rotating groove, and a threaded ring is fixedly connected to one end of the sleeve near the threaded tube, and the threaded tube and the threaded ring are threadedly connected.

[0014] Preferably, a vacuum pump and a pressure pump are fixedly connected to the upper surface of the base plate, and the output ends of the vacuum pump and the pressure pump are both fixedly connected to PU pneumatic hoses.

[0015] Preferably, a vacuum water-gas separator is fixedly connected to the upper surface of the base plate, one end of the vacuum water-gas separator is connected to a vacuum pump, and the other end of the vacuum water-gas separator is connected to a first ball valve.

[0016] Preferably, a water storage buffer tank is fixedly connected to the upper surface of the base plate, the first ball valve is connected to the water storage buffer tank, a drain valve is installed on the outer wall of the water storage buffer tank, a vacuum gauge is provided between the vacuum water-air separator and the first ball valve, and the vacuum gauge is connected to the PU pneumatic hose.

[0017] Preferably, an oil-water separator is fixedly connected to the upper surface of the base plate. One end of the oil-water separator is connected to a pressure pump, and the other end of the oil-water separator is fixedly connected to a pressure regulating valve. The pressure regulating valve is connected to a second ball valve, and a pressure gauge is provided between the pressure regulating valve and the second ball valve. The pressure gauge is connected to a PU pneumatic hose.

[0018] Preferably, a tee is provided on the upper surface of the base plate, and a third ball valve is fixedly connected to the end of the tee away from the water storage buffer tank. A plug with an air pipe is fixedly connected to the output end of the third ball valve, and a sealing plug is threaded to the end of the plug with the air pipe away from the third ball valve.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, wet testing is commonly used in membrane element production. However, if an anomaly is detected during testing, leak detection is difficult, especially when an malfunction occurs in a membrane element during use. Liquid trapped in the membrane's guide cloth cannot be drained and can be drawn into the vacuum pump during vacuum testing, affecting the pump's lifespan. Therefore, vacuum testing of wet membranes for membrane airtightness and leak detection is rarely used in the industry. This invention adds a water storage buffer tank and a vacuum water vapor separator to the vacuum testing pipeline. This effectively traps and collects residual liquid precipitated from the wet membrane's guide cloth, achieving water vapor separation, preventing liquid from entering the vacuum pump, protecting the testing equipment, and extending its service life. This structural improvement allows the device to simultaneously perform airtightness testing and leak detection on both dry and in-use wet membranes, broadening its applicability and enhancing its adaptability to various operating conditions.

[0020] 2. In this invention, a dual judgment method is adopted, which combines vacuum numerical quantitative monitoring with visual and intuitive observation of foaming. This eliminates the limitations of subjective human judgment, reduces the difficulty of operation, effectively reduces missed detections and false detections, and can quickly identify various minor leakage defects such as membrane pinholes, glue seam cracks, and membrane fiber breaks without complicated disassembly. The positioning accuracy is high, which effectively simplifies the detection process and improves the integration of equipment and the efficiency of batch detection.

[0021] 3. In this invention, the device pipeline adopts a combination connection structure of quick-connect coupling and ferrule sealing, which can quickly complete the clamping and disassembly of membrane elements, greatly improving the convenience of assembly and subsequent operation and maintenance; at the same time, the ferrule sealing structure can effectively ensure the sealing of pipeline connection, avoid the leakage of pipeline itself causing vacuum degree detection error, and improve work efficiency while ensuring the detection accuracy and operation stability of the whole machine. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a vacuum detection and leak-precision location device for reverse osmosis membrane elements according to the present invention; Figure 2 This is a schematic diagram of the three-way structure of a vacuum detection and leak-precision location device for reverse osmosis membrane elements according to the present invention; Figure 3 This is a schematic cross-sectional view of the threaded tube of a vacuum detection and leak-precision location device for reverse osmosis membrane elements according to the present invention. Figure 4 This is a schematic cross-sectional view of the sleeve structure of a vacuum detection and leak precise location device for a reverse osmosis membrane element according to the present invention. Figure 5 This is a schematic cross-sectional view of the insertion section of a vacuum detection and leak-precision location device for a reverse osmosis membrane element according to the present invention. Figure 6 This is a schematic cross-sectional view of the slot structure of the vacuum detection and leak point precise positioning device for reverse osmosis membrane elements according to the present invention; Figure 7 This is a cross-sectional view of the gas storage ring of a vacuum detection and leak-precision location device for reverse osmosis membrane elements according to the present invention.

[0023] In the diagram: 1. Base plate; 2. Vacuum pump; 3. Pressure pump; 4. Vacuum water-air separator; 5. Vacuum gauge; 6. First ball valve; 7. Water storage buffer tank; 8. Third ball valve; 9. T-junction; 10. Second ball valve; 11. Pressure gauge; 12. Pressure regulating valve; 13. Oil-water separator; 14. PU pneumatic hose; 15. Drain valve; 16. Plug with air pipe connection; 17. Sealing plug; 18. Sleeve; 19. Insert tube; 20. Screw 21. Threaded tube; 22. Threaded ring; 23. Push ring; 24. Limiting ring; 25. Sliding groove; 26. Sliding block; 27. Rotating groove; 28. Snap groove; 29. ​​Return spring; 30. Rolling groove; 31. Ball bearing; 32. Air storage ring; 33. Hollow sealing ring; 34. Air inlet pipe; 35. Mounting groove; 36. Fixing groove; 37. Placement groove; 38. Extrusion plate; 39. Connecting rod; 40. Piston ring; 41. Compression spring; 42. Cavity. Detailed Implementation

[0024] 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.

[0025] refer to Figures 1-7 The device for vacuum detection and precise leak location of a reverse osmosis membrane element, as shown, includes a base plate 1. A quick-release assembly is mounted on the base plate 1 for rapid assembly and disassembly of the valve body. A specific embodiment is shown below: Example 1 The quick-release assembly includes a sleeve 18, a first ball valve 6, a third ball valve 8, and a second ball valve 10. Insertion tubes 19 are fixedly connected to both ends of the first ball valve 6, the third ball valve 8, and the second ball valve 10. The sleeve 18 is slidably connected to the insertion tube 19. Multiple rolling grooves 29 are evenly distributed along the circumference of the sleeve 18. Ball bearings 30 are installed within the rolling grooves 29. The outer wall of the insertion tube 19 has a retaining groove 27, an installation groove 34, and a fixing groove 35, with the ball bearings 30 engaging with the retaining groove 27. A sliding groove 24 is formed on the outer wall of the sleeve 18, with a slider 25 slidably connected within it. A push ring 22 is slidably connected to the outer wall of the sleeve 18, and the slider 25 is fixedly connected to the push ring 22. A limit ring 23 is fixedly connected to the outer wall of the sleeve 18. A return spring 28 is fitted onto the outer wall of the sleeve 18, positioned between the push ring 22 and the limit ring 23. The outer wall of the insertion tube 19 has a rotating groove 26, and a threaded tube 20 is rotatably connected in the rotating groove 26. A threaded ring 21 is fixedly connected to one end of the sleeve 18 near the threaded tube 20, and the threaded tube 20 and the threaded ring 21 are threadedly connected.

[0026] During assembly, the insertion tube 19 is inserted into the sleeve 18. When the insertion tube 19 abuts against the inner wall of the sleeve 18, the retaining groove 27 on the insertion tube 19 moves to directly below the rolling groove 29. The return spring 28 pushes the push ring 22 to move along the sliding groove 24, squeezing the ball 30 into the retaining groove 27, thereby locking the insertion tube 19 and the sleeve 18. Through the threaded locking engagement of the threaded tube 20 and the threaded ring 21, the sleeve 18 and the insertion tube 19 are axially locked and fixed, achieving quick docking, positioning, and sealing of the valve body and the pipeline. Furthermore, the first ball valve 6, the third ball valve 8, and the second ball valve 10 all use quick-release components at both ends. During disassembly, the threaded tube 20 is loosened in the opposite direction, and the push ring 22 is pushed to squeeze the slider 25 to slide along the sliding groove 24, releasing the retaining limit between the ball 30 and the retaining groove 27. This allows for quick separation of the pipeline and the valve body without the need for special tools, making disassembly and assembly convenient and significantly reducing the difficulty of equipment operation and maintenance.

[0027] Example 2 A vacuum pump 2 and a pressure pump 3 are fixedly connected to the upper surface of the base plate 1. The output ends of the vacuum pump 2 and the pressure pump 3 are both fixedly connected to PU pneumatic hoses 14. A vacuum water-gas separator 4 is fixedly connected to the upper surface of the base plate 1. One end of the vacuum water-gas separator 4 is connected to the vacuum pump 2, and the other end of the vacuum water-gas separator 4 is connected to the first ball valve 6. A water storage buffer tank 7 is fixedly connected to the upper surface of the base plate 1. A first ball valve 6 is connected to the water storage buffer tank 7. A drain valve 15 is installed on the outer wall of the water storage buffer tank 7. A vacuum gauge 5 is installed between the vacuum water-air separator 4 and the first ball valve 6. The vacuum gauge 5 is connected to the PU pneumatic hose 14. An oil-water separator 13 is fixedly connected to the upper surface of the base plate 1. One end of the oil-water separator 13 is connected to the pressure pump 3. The other end of the oil-water separator 13 is fixedly connected to the pressure regulating valve 12. The pressure regulating valve 12 is connected to the second ball valve 10. A pressure gauge 11 is installed between the pressure regulating valve 12 and the second ball valve 10. The pressure gauge 11 is connected to the PU pneumatic hose 14. A tee 9 is installed on the upper surface of the base plate 1. A third ball valve 8 is fixedly connected to the end of the tee 9 away from the water storage buffer tank 7. A plug with an air pipe connection is fixedly connected to the output end of the third ball valve 8. A sealing plug 17 is threadedly connected to the end of the plug with an air pipe connection away from the third ball valve 8.

[0028] By constructing independent vacuum detection gas paths and pressurized leak detection gas paths that do not interfere with each other, and relying on the three-way valve 9 to achieve the convergence and integration of the two gas paths and share the membrane element plugging tool, rapid detection of reverse osmosis membrane elements can be achieved.

[0029] The vacuum testing gas path uses vacuum pump 2 as the negative pressure source. Through vacuum water-gas separator 4 and water storage buffer tank 7, a pre-positioned water vapor interception and protection structure is formed. When vacuum testing the membrane element, the residual water precipitated inside the wet membrane guide cloth can be collected and separated, effectively preventing liquid media from being sucked into the vacuum pump 2. This completely solves the technical problems of traditional vacuum testing equipment being unable to adapt to wet membrane testing and the pump body being easily damaged by water ingress. This allows the equipment to be compatible with the airtightness testing of both dry membranes and liquid-laden wet membranes. At the same time, it works with vacuum gauge 5 to collect pipeline vacuum pressure drop data in real time, so as to quantify pressure changes and accurately determine the overall sealing performance of the membrane element.

[0030] The pressurized leak detection air circuit uses pressure pump 3 as the positive pressure air source. Oil and water impurities in the compressed air are removed by oil-water separator 13 to ensure the cleanliness of the detection air source. The pressure is then stabilized by pressure regulating valve 12 and monitored in real time by pressure gauge 11, supplying a constant low-pressure gas into the membrane element. This provides a stable air source for subsequent foaming, visualization, and precise leak location. The two air circuits operate independently and are easy to switch between, effectively balancing the quantitative screening of the overall airtightness of the membrane element with the precise location of microscopic leaks. All the above components are connected by PU pneumatic hoses 14.

[0031] Example 3 The slot 27 has multiple placement slots 36 evenly distributed around its circumference. An extrusion plate 37 is installed in the placement slot 36. An air storage ring 31 is fixedly connected in the fixing slot 35. A cavity 41 is opened in the air storage ring 31. A piston ring 39 is slidably connected in the cavity 41. Multiple connecting rods 38 are evenly installed on one end of the piston ring 39 near the slot 27. The connecting rods 38 are fixedly connected to the extrusion plate 37. A ball bearing 30 abuts against the extrusion plate 37. A hollow sealing ring 32 is installed in the mounting slot 34. An air inlet pipe 33 is fixedly connected to one end of the air storage ring 31 near the hollow sealing ring 32. The hollow sealing ring 32 and the air storage ring 31 are connected through the air inlet pipe 33. A compression spring 40 is installed in the air storage ring 31. The compression spring 40 abuts against the piston ring 39.

[0032] During the insertion of the insertion tube 19 into the sleeve 18, the ball bearing 30 pushes the compression plate 37 to move. The compression plate 37, through the connecting rod 38, simultaneously pushes the piston ring 39 to move axially along the cavity 41 inside the gas storage ring 31, compressing the gas inside the cavity 41. The pressurized gas is quickly introduced into the hollow sealing ring 32 through the air inlet pipe 33, causing the hollow sealing ring 32 to expand adaptively and tightly fit the mating gap between the insertion tube 19 and the sleeve 18, achieving complete gap filling and high-pressure sealing. This structure, while enabling quick disassembly and assembly of the valve body pipeline and convenient operation and maintenance, significantly improves the overall airtightness of the entire dual-pipeline detection system, eliminates vacuum degree detection errors and misjudgments of pressure leak detection caused by pipeline leakage, and ensures the accuracy of vacuum pressure holding detection and leak point location.

[0033] The working principle of this invention is as follows: Before the testing operation, the equipment status is first checked to ensure that the first ball valve 6 and the second ball valve 10 are in the fully closed state, and the third ball valve 8 is in the fully open state, so as to ensure that the initial gas path conditions meet the testing standards. Then, the two ends of the reverse osmosis membrane element to be tested are sealed by connecting plug 16 with air pipe and sealing plug 17 respectively, to ensure that the membrane element is completely sealed and there is no external gas leakage.

[0034] After the membrane element is clamped and sealed, open the first ball valve 6 and start the vacuum pump 2 to evacuate the internal cavity of the membrane element. Observe the change in the value of the vacuum gauge 5 in real time. When the value of the vacuum gauge 5 reaches -0.09 MPa, immediately close the first ball valve 6 and the vacuum pump 2, maintain the pressure and let it stand for 1 minute, and record the final value of the vacuum gauge 5. If the vacuum value is lower than -0.06 MPa after standing, it is determined that the membrane element has abnormal airtightness and there is a leakage defect.

[0035] After determining that a leak exists in the membrane element, a precise leak location operation is performed. The inflation pressure is adjusted by regulating valve 12, and pressure gauge 11 is observed. The system inflation pressure is stabilized at approximately 0.02 MPa. After adjustment, the second ball valve 10 is slowly opened, and a small amount of compressed air is introduced into the membrane element through pressure pump 3. Subsequently, leak detection foaming agent is evenly sprayed on the end face of the membrane element and the surface of the membrane body. If there are leaks such as pinhole damage, cracked adhesive seams, or broken membrane fibers, the leaking gas will cause obvious bubbling of the foaming agent at the corresponding location. The staff can intuitively and quickly locate the specific leak point, achieving precise micro-leak location.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vacuum detection and precise positioning device for reverse osmosis membrane element leakage, comprising a base plate (1), characterized in that: The base plate (1) is provided with a quick-release assembly, which is used for quick disassembly and assembly of the valve body; The quick-release assembly includes a sleeve (18), a first ball valve (6), a third ball valve (8), and a second ball valve (10). Insertion tubes (19) are fixedly connected to both ends of the first ball valve (6), the third ball valve (8), and the second ball valve (10). The sleeve (18) and the insertion tube (19) are slidably connected. The sleeve (18) has multiple rolling grooves (29) evenly distributed circumferentially. Ball bearings (30) are installed in the rolling grooves (29). The outer wall of the insertion tube (19) has a retaining groove (27), an installation groove (34), and a fixing groove (35). The ball bearings (30) and the retaining grooves (27, 28, 29 ... 27) The slot (27) is evenly provided with multiple placement slots (36) along the circumference. An extrusion plate (37) is installed in the placement slot (36). An air storage ring (31) is fixedly connected in the fixing slot (35). A cavity (41) is provided in the air storage ring (31). A piston ring (39) is slidably connected in the cavity (41). Multiple connecting rods (38) are evenly installed on one end of the piston ring (39) near the slot (27). The connecting rods (38) are fixedly connected to the extrusion plate (37). The ball (30) abuts against the extrusion plate (37).

2. The reverse osmosis membrane element vacuum detection and leak point precise location device according to claim 1, characterized in that: The outer wall of the sleeve (18) is provided with a sliding groove (24), a slider (25) is slidably connected in the sliding groove (24), a push ring (22) is slidably connected in the outer wall of the sleeve (18), and the slider (25) and the push ring (22) are fixedly connected.

3. The reverse osmosis membrane element vacuum detection and leak point precise location device according to claim 2, characterized in that: The outer wall of the sleeve (18) is fixedly connected to a limiting ring (23), and a reset spring (28) is sleeved on the outer wall of the sleeve (18). The reset spring (28) is located between the push ring (22) and the limiting ring (23).

4. The reverse osmosis membrane element vacuum detection and leak point precise location device according to claim 1, characterized in that: A hollow sealing ring (32) is installed in the mounting groove (34). An air inlet pipe (33) is fixedly connected to one end of the air storage ring (31) near the hollow sealing ring (32). The hollow sealing ring (32) and the air storage ring (31) are connected through the air inlet pipe (33). A compression spring (40) is installed in the air storage ring (31). The compression spring (40) abuts against the piston ring (39).

5. The reverse osmosis membrane element vacuum detection and leak point precise location device according to claim 1, characterized in that: The outer wall of the insertion tube (19) is provided with a rotating groove (26), and a threaded tube (20) is rotatably connected in the rotating groove (26). A threaded ring (21) is fixedly connected to one end of the sleeve (18) near the threaded tube (20), and the threaded tube (20) and the threaded ring (21) are threadedly connected.

6. The reverse osmosis membrane element vacuum detection and leak point precise location device according to claim 1, characterized in that: A vacuum pump (2) and a pressure pump (3) are fixedly connected to the upper surface of the base plate (1), and PU pneumatic hoses (14) are fixedly connected to the output ends of the vacuum pump (2) and the pressure pump (3).

7. The reverse osmosis membrane element vacuum detection and leak point precise location device according to claim 6, characterized in that: A vacuum water-gas separator (4) is fixedly connected to the upper surface of the base plate (1). One end of the vacuum water-gas separator (4) is connected to the vacuum pump (2), and the other end of the vacuum water-gas separator (4) is connected to the first ball valve (6).

8. The reverse osmosis membrane element vacuum detection and leak point precise location device according to claim 7, characterized in that: A water storage buffer tank (7) is fixedly connected to the upper surface of the base plate (1). The first ball valve (6) is connected to the water storage buffer tank (7). A drain valve (15) is installed on the outer wall of the water storage buffer tank (7). A vacuum gauge (5) is provided between the vacuum water-air separator (4) and the first ball valve (6). The vacuum gauge (5) is connected to the PU pneumatic hose (14).

9. The reverse osmosis membrane element vacuum detection and leak point precise location device according to claim 8, characterized in that: An oil-water separator (13) is fixedly connected to the upper surface of the base plate (1). One end of the oil-water separator (13) is connected to the pressure pump (3), and the other end of the oil-water separator (13) is fixedly connected to a pressure regulating valve (12). The pressure regulating valve (12) is connected to the second ball valve (10). A pressure gauge (11) is provided between the pressure regulating valve (12) and the second ball valve (10). The pressure gauge (11) is connected to the PU pneumatic hose (14).

10. The reverse osmosis membrane element vacuum detection and leak point precise location device according to claim 9, characterized in that: The upper surface of the base plate (1) is provided with a tee (9). The end of the tee (9) away from the water storage buffer tank (7) is fixedly connected to a third ball valve (8). The output end of the third ball valve (8) is fixedly connected to a plug with an air pipe connection (16). The end of the plug with an air pipe connection (16) away from the third ball valve (8) is threadedly connected to a sealing plug (17).

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