PES membrane quality detection device

Abstract

The utility model discloses PES membrane quality detection device, including constant temperature infiltration pool, pressure tank, constant temperature infiltration pool is equipped with wetting liquid, and the pressure tank is located one side of constant temperature infiltration pool, and the pressure tank includes the box and the lid, and the upper end of box is equipped with annular support platform, and the middle part of lid is equipped with the observation port, and the lower end fixedly connected with annular pressing plate of lid, and the periphery of lid keeps fixed through a plurality of fixed mechanisms and the box, and the pressure gauge, pressurizing pipe and pressure relief pipe are installed on the box. The utility model discloses through integration constant temperature infiltration and pressure test, has guaranteed the unity and accuracy of test condition. Annular pressing plate and triple elastic pad sealing structure, have improved the sealing reliability of membrane piece periphery significantly, effectively prevent the gas leakage in the pressurization process. The device is high in integration, and easy to operate, can efficiently, accurately identify the defect of PES membrane, improves the detection efficiency and result reliability.

Description

Technical Field

[0001] This utility model belongs to the field of material testing technology, specifically relating to a PES membrane quality testing device. Background Technology

[0002] Polyethersulfone (PES) membranes, as high-performance polymer separation membranes, are widely used in microfiltration and ultrafiltration processes in water treatment, food and beverage, and biopharmaceutical industries due to their excellent thermal stability, chemical stability, and mechanical strength. The quality of the membrane directly determines the efficiency of the separation process and the quality of the product; one of its core indicators is the integrity of the membrane surface, i.e., the presence of defects such as pinholes and cracks.

[0003] Currently, the bubble spot method is a commonly used and effective non-destructive testing method for the integrity testing of hydrophobic or hydrophilic membrane materials such as PES membranes. This method is based on the principle that the pressure required for gas to penetrate the pores of a liquid-wetted membrane is inversely proportional to the pore size. By observing the pressure at which the first bubble is generated on the membrane surface under pressure, or the generation of bubbles under specific pressure, the defects and maximum pore size of the membrane can be determined. However, existing bubble spot method testing devices still have some shortcomings in practical applications: for example, the pretreatment of membrane samples (such as isothermal wetting) is often separated from the testing process, which is cumbersome and may affect the accuracy of the test due to temperature fluctuations; during testing, the fixing and sealing methods of the membrane may not be reliable enough, easily leading to leakage under high pressure and test failure; in addition, the automation and integration of the entire testing process are not high, affecting the testing efficiency. Therefore, developing a PES membrane quality testing device that can achieve isothermal wetting, reliable sealing, and convenient operation is of great significance for improving the accuracy and efficiency of membrane product quality control. Utility Model Content

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a PES membrane quality testing device, including a constant temperature wetting tank and a pressure box. The constant temperature wetting tank is filled with wetting liquid, and the wetting liquid is kept at a constant temperature by a constant temperature device installed in the constant temperature wetting tank. The pressure box is located on one side of the constant temperature wetting tank. The pressure box includes a box body and a box cover. The upper end of the box body is provided with an annular support platform, and the middle of the box cover is provided with an observation port. The lower end of the box cover is fixedly connected to an annular pressure plate for insertion into the box body. The box cover is fixed to the box body by several fixing mechanisms. A pressure gauge, a pressure pipe, and a pressure relief pipe are installed on the box body. The pressure gauge measures the air pressure inside the box body. Control valves are installed on the pressure pipe and the pressure relief pipe respectively. The pressure pipe is connected to a pressure gas tank.

[0005] As a preferred embodiment of the above technical solution, a retention plate is provided on one side of the upper end of the constant temperature immersion tank.

[0006] As a preferred embodiment of the above technical solution, the retention plate is provided with several drainage channels, which are connected to a constant temperature immersion pool.

[0007] As a preferred embodiment of the above technical solution, the constant temperature device includes a disc-shaped heat exchange tube and a thermometer is installed in the constant temperature immersion tank.

[0008] As a preferred embodiment of the above technical solution, an inner elastic pad is fixed to the inner side of the annular support platform, and an outer elastic pad is fixed to the lower end of the annular pressure plate. A groove for inserting the inner elastic pad is formed between the inner elastic pad and the inner wall of the box.

[0009] As a preferred embodiment of the above technical solution, the inner elastic pad is provided with a drain outlet.

[0010] As a preferred embodiment of the above technical solution, the fixing mechanism includes an upper pressure plate and a lower pressure plate. One end of the upper pressure plate and one end of the lower pressure plate are fixedly connected by a vertical connecting plate. The upper pressure plate is provided with a threaded hole, and a clamping screw is threaded into the threaded hole.

[0011] As a preferred embodiment of the above technical solution, a drain pipe is connected to the lower end of the box, and a cap is threaded onto the drain pipe.

[0012] The beneficial effects of this invention are as follows: By integrating constant-temperature immersion and pressure testing, this invention ensures the uniformity and accuracy of testing conditions. The unique annular pressure plate and triple elastic gasket sealing structure significantly improve the sealing reliability around the membrane, effectively preventing gas leakage during pressurization. The indwelling plate and drain trough design enable automatic and rapid discharge of residual liquid after membrane immersion. This device has a high degree of integration, is easy to operate, and can efficiently and accurately identify defects in PES membranes, improving detection efficiency and result reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the pressure tank. Detailed Implementation

[0014] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0015] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] like Figure 1-2 As shown, the PES membrane quality testing device includes a constant-temperature immersion tank 1 and a pressure chamber. The constant-temperature immersion tank 1 contains a wetting liquid, which is kept at a constant temperature by a thermostat installed in the tank. The pressure chamber is located on one side of the immersion tank 1 and includes a body 2 and a cover 3. The upper end of the body 2 is provided with an annular support platform 4, and the middle of the cover 3 is provided with an observation port 5. The lower end of the cover 3 is fixedly connected to an annular pressure plate 6 for insertion into the body 2. The cover 3 is fixed to the body 2 by several fixing mechanisms. A pressure gauge 7, a pressure pipe 8, and a pressure relief pipe 9 are installed on the body 2. The pressure gauge 7 measures the air pressure inside the body 2. Control valves 10 are installed on the pressure pipe 8 and the pressure relief pipe 9, respectively. The pressure pipe 8 is connected to a pressurized gas tank. Before testing, the PES membrane is immersed in the constant-temperature immersion tank 1, which contains a constant-temperature liquid, typically water, at a temperature of 25 degrees Celsius. After the PES membrane is fully impregnated, it is placed in a pressure chamber. The PES membrane is sandwiched between annular support platform 4 and annular pressure plate 6. Compressed air at a certain pressure is introduced into the chamber 2 through pressurization pipe 8, and then control valve 10 is closed. The surface of the PES membrane is observed through observation port 5. If air bubbles appear in concentrated areas, there is a quality problem in that area. After the test is completed, the pressure is quickly released through pressure relief pipe 9, the chamber cover 3 is opened, and the PES membrane can be removed, completing the test. The entire test process is preferably carried out in a constant temperature environment.

[0018] Furthermore, a retention plate 11 is provided on one side of the upper end of the constant temperature immersion tank 1. After immersion, the PES membrane is placed on the retention plate 11 for a certain period of time to drain excess liquid.

[0019] Furthermore, the indwelling plate 11 is provided with a plurality of drainage channels 12, which are connected to the constant temperature immersion tank 1. When the PES membrane is placed on the indwelling plate 11, excess liquid automatically returns to the constant temperature immersion tank 1 through the drainage channels 12.

[0020] Furthermore, the temperature control device includes a disc-shaped heat exchange tube, and a thermometer is installed in the temperature-controlled immersion tank 1. When the liquid temperature in the temperature-controlled immersion tank 1 is too high, a low-temperature circulating liquid is injected into the disc-shaped heat exchange tube to cool it down. When the liquid temperature in the temperature-controlled immersion tank 1 is too low, a high-temperature circulating liquid is injected into the disc-shaped heat exchange tube to raise the temperature.

[0021] Furthermore, an inner elastic pad 13 is fixed to the inner side of the annular support platform 4, and an outer elastic pad 14 is fixed to the lower end of the annular pressure plate 6. A clamping groove 15 is formed between the inner elastic pad 13 and the inner wall of the box 2 for the inner elastic pad 13 to be inserted. The PES membrane extends into the clamping groove 15 around its perimeter. After the box cover 3 is closed, the annular pressure plate 6 is inserted into the box 2 and placed on the annular support platform 4. At this time, the outer elastic pad 14 is inserted into the clamping groove 15. In this way, a triple compression seal is formed around the PES membrane: the compression between the outer elastic pad 14 and the annular support platform 4, the compression between the outer elastic pad 14 and the inner elastic pad 13, and the compression seal between the inner elastic pad 13 and the annular pressure plate 6.

[0022] Furthermore, the inner elastic pad 13 is provided with a drain outlet 16. The drain outlet 16 can drain the liquid in the clamping groove 15.

[0023] Furthermore, the fixing mechanism includes an upper pressure plate 18 and a lower pressure plate 19. One end of the upper pressure plate 18 and one end of the lower pressure plate 19 are fixedly connected by a vertical connecting plate 20. The upper pressure plate 18 is provided with a threaded hole, and a clamping screw 23 is threaded into the threaded hole. The upper end of the box body 2 is provided with an outwardly folded edge. An elastic pad is fixedly connected to the lower pressure plate 19. The edge and the perimeter of the box cover 3 are sandwiched between the upper pressure plate 18 and the lower pressure plate 19. Then, the clamping screw 23 is turned to fix the box cover 3. After the box cover 3 is fixed, the perimeter of the PES film is clamped by the annular support platform 4 and the annular pressure plate 6 to form a sealed state.

[0024] Furthermore, a drain pipe 24 is connected to the lower end of the housing 2, and a cap 25 is threaded onto the drain pipe 24. A small amount of liquid dripping inside the housing 2 can be discharged through the drain pipe 24. Tightening the cap 25 does not affect the sealing of the inside of the housing 2.

[0025] It is worth mentioning that the technical features of the pressure gauge 7, control valve 10, thermometer and other components involved in this utility model patent application should be regarded as prior art. The specific structure, working principle and possible control method and spatial arrangement of these technical features can be adopted by conventional choices in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated in detail.

[0026] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experimentation on the basis of the prior art should be within the scope of protection defined by the claims.

Claims

1. A PES membrane quality testing device, characterized in that, The device includes a constant-temperature immersion tank and a pressure chamber. The constant-temperature immersion tank contains a wetting liquid, which is kept at a constant temperature by a constant-temperature device installed in the tank. The pressure chamber is located on one side of the constant-temperature immersion tank and includes a body and a cover. The upper end of the body is provided with an annular support platform, and the middle of the cover is provided with an observation port. The lower end of the cover is fixedly connected to an annular pressure plate for insertion into the body of the body. The cover is fixed to the body by several fixing mechanisms. A pressure gauge, a pressure pipe, and a pressure relief pipe are installed on the body. The pressure gauge measures the internal air pressure of the body. Control valves are installed on the pressure pipe and the pressure relief pipe, respectively. The pressure pipe is connected to a pressurized gas tank.

2. The PES membrane quality testing device as described in claim 1, characterized in that, A retention plate is provided on one side of the upper end of the constant temperature immersion tank.

3. The PES membrane quality testing device as described in claim 2, characterized in that, The retention plate is provided with several drainage channels, which are connected to a constant temperature immersion tank.

4. The PES membrane quality testing device as described in claim 1, characterized in that, The constant temperature device includes a disc-shaped heat exchange tube, and a thermometer is installed in the constant temperature immersion tank.

5. The PES membrane quality testing device as described in claim 1, characterized in that, An inner elastic pad is fixed to the inner side of the annular support platform, and an outer elastic pad is fixed to the lower end of the annular pressure plate. A groove is formed between the inner elastic pad and the inner wall of the box for the inner elastic pad to be inserted.

6. The PES membrane quality testing device as described in claim 5, characterized in that, The inner elastic pad is provided with a drain outlet.

7. The PES membrane quality testing device as described in claim 1, characterized in that, The fixing mechanism includes an upper pressure plate and a lower pressure plate. One end of the upper pressure plate and one end of the lower pressure plate are fixedly connected by a vertical connecting plate. The upper pressure plate is provided with a threaded hole, and a clamping screw is threaded into the threaded hole.

8. The PES membrane quality testing device as described in claim 1, characterized in that, The lower end of the box is connected to a drain pipe, and a cap is threaded onto the drain pipe.

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