Device for testing performance of nanofiltration membrane

Abstract

The utility model discloses a device for testing nanofiltration membrane performance, which comprises a bottom plate, a liquid collecting box, a pressurizing chamber, a sealing element, a liquid inlet pipe arranged at the top of the pressurizing chamber, an air inlet pipe, a pressure release valve and a pressure gauge, the liquid inlet pipe and the air inlet pipe are arranged at two sides of the central line of the top of the pressurizing chamber, the pressure release valve is arranged at one side of the pressurizing chamber, and the pressure gauge is arranged at the other side of the pressurizing chamber. The pressure gauge is arranged on the other side of the top of the pressurizing chamber, the liquid collecting box is arranged on the top of the bottom plate and connected with the bottom plate, the pressurizing chamber is arranged on the sealing piece, a placing frame is arranged in the liquid collecting box, and a nanofiltration membrane is arranged on the placing frame. According to the utility model, the pressurizing chamber is arranged to pressurize sewage needing to be filtered, so that the pressure of the sewage passing through the nanofiltration membrane on the placing rack is different, the membrane flux and the retention rate of the same nanofiltration membrane under different pressures are realized, and the detection quality of the nanofiltration membrane performance is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to nanofiltration membrane performance test technical field, especially relate to a device for testing nanofiltration membrane performance. BACKGROUND

[0002] Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration, which is used to separate relatively small molecular weight substances such as inorganic salts or glucose, sucrose and other small molecular organic substances from solvents. Nanofiltration, also known as low-pressure reverse osmosis, is a new field of membrane separation technology. Its separation performance is between reverse osmosis and ultrafiltration, allowing some inorganic salts and certain solvents to pass through the membrane to achieve the effect of separation. The pore size of nanofiltration membrane is about several nanometers, usually 1-2 nanometers, hence the name nanofiltration membrane.

[0003] Due to different scenes of using nanofiltration membrane, the pressure of sewage to be filtered is different, and the existing detection device can only detect the membrane flux and retention rate of nanofiltration membrane under the same pressure, and cannot detect the membrane flux and retention rate of nanofiltration membrane under different pressures, affecting the detection quality of nanofiltration membrane performance. UTILITY MODEL CONTENT

[0004] The utility model discloses a device for testing nanofiltration membrane performance, which can pressurize the sewage to be filtered, ensure the pressure of sewage when passing through the nanofiltration membrane on the placing rack, realize the membrane flux and retention rate of the same nanofiltration membrane under different pressures, and greatly improve the detection quality of nanofiltration membrane performance.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0006] A device for testing nanofiltration membrane performance, comprising a bottom plate, a liquid collecting tank, a pressurizing chamber, a sealing element, a liquid inlet pipe installed on the top of the pressurizing chamber, an air inlet pipe, a pressure relief valve and a pressure gauge, the liquid inlet pipe and the air inlet pipe are arranged on both sides of the top center line of the pressurizing chamber, and the air inlet pipe is connected with an external inert gas storage tank, the pressure relief valve is arranged on one side of the pressurizing chamber, the pressure gauge is arranged on the other side of the top of the pressurizing chamber, the liquid collecting tank is arranged on the top of the bottom plate and connected with the bottom plate, the pressurizing chamber is arranged on the sealing element and connected with the sealing element, a placing rack is arranged in the liquid collecting tank, a nanofiltration membrane is arranged on the placing rack, the bottom of the pressurizing chamber penetrates through the sealing element and abuts against the placing rack, and the nanofiltration membrane is arranged directly below the pressurizing chamber, a plugging element is further arranged on the pressurizing chamber, and a liquid outlet pipe is further installed on one side of the bottom of the liquid collecting tank.

[0007] Preferably, the sealing member comprises adjusting cylinders symmetrically arranged on both sides of the pressurizing chamber, side ears and a sealing plate, the side ears are fixedly installed on both sides of one end of the sealing plate, the piston rod of the adjusting cylinder is connected with the side ear, and the sealing member is used for sealing the pressurizing chamber, so that the sewage in the pressurizing chamber is pressurized, the pressure of the sewage passing through the nanofiltration membrane on the placing rack is ensured to be different, the membrane flux and the retention rate of the same nanofiltration membrane under different pressures are realized, and the detection quality of the nanofiltration membrane performance is greatly improved.

[0008] Preferably, a through hole is formed in the pressurizing chamber, a fixing groove is further formed in the side wall of the pressurizing chamber and communicates with the through hole, the sealing plate is in sliding fit with the through hole, and the side wall of the sealing plate is in sliding fit with the fixing groove, so that the sealing plate is conveniently installed and fixed, the purpose of sealing the pressurizing chamber is realized, and the device can normally pressurize the sewage.

[0009] Preferably, a rubber pad for sealing the sealing plate and the inner wall of the pressurizing chamber is arranged in the fixing groove, so that the sealing plate is conveniently sealed, and the device pressurizes the sewage.

[0010] Preferably, the sealing member comprises a fixing frame, a lifting cylinder and a sealing plate, the pressurizing chamber is fixedly installed in the middle of the sealing plate, the bottom of the pressurizing chamber extends to below the sealing plate through the sealing plate, the fixing frame is fixedly installed on the top of the bottom plate and located on one side of the liquid collecting tank, and the lifting cylinder is fixedly installed on the top of the fixing frame and the piston rod of the lifting cylinder is fixedly installed on the sealing plate, so that the sealing member is used for sealing the liquid collecting tank, the device conveniently performs nanofiltration on the sewage, the sealing plate can seal the liquid collecting tank and support the pressurizing chamber, and the normal work of the pressurizing chamber is ensured.

[0011] Preferably, the side wall of the liquid collecting tank is fixedly installed with a fixing plate, and a sealing block is further fixedly installed on the bottom of the sealing plate, the sealing block cooperates with the fixing plate, the fixing plate is used for supporting the placing rack and can provide a guiding purpose for the installation of the placing rack, and the sealing block and the fixing plate cooperatively seal and fix the liquid collecting tank.

[0012] Preferably, an installation groove is further formed in the fixing plate, and a lifting piece is arranged in the installation groove, the lifting piece comprises a guide rod, a lifting plate and a spring, both ends of the guide rod are fixedly installed on the side walls of the installation groove, the lifting plate is slidably installed on the guide rod, and the spring is sleeved on the guide rod and located between the lifting plate and the inner wall of the installation groove, so that the lifting piece is used for lifting the placing rack, the nanofiltration membrane on the placing rack is ensured to be in a stable state, the nanofiltration efficiency and quality of the nanofiltration membrane on the sewage are ensured, and the spring can buffer and ensure that the bottom of the pressurizing chamber always abuts against the placing plate.

[0013] Preferably, the placing frame comprises a placing plate, a nanofiltration membrane and side plates fixedly installed at both ends of the placing plate, the placing plate is matched with the lifting plate, a mounting hole is formed in the middle of the placing plate, the nanofiltration membrane is installed in the mounting hole, and the placing frame is arranged to facilitate fixing of the nanofiltration membrane, so that the nanofiltration membrane is always in a stable state during work.

[0014] Preferably, a groove is formed at the outer side of the mounting hole, the groove is matched with the bottom of the pressurizing chamber, a sealing gasket for sealing the bottom of the pressurizing chamber and the placing plate is further arranged in the groove, the groove can position the pressurizing chamber, and the groove can also seal the bottom of the pressurizing chamber, so that normal filtration of the nanofiltration membrane is ensured, and the nanofiltration quality and efficiency of the nanofiltration membrane are improved.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1) The arrangement of the pressurizing chamber in the device can pressurize the sewage that needs to be filtered, so that the pressure of the sewage passing through the nanofiltration membrane on the placing frame is different, the membrane flux and retention rate of the same nanofiltration membrane under different pressures are realized, and the detection quality of the performance of the nanofiltration membrane is greatly improved.

[0017] 2) The sealing piece of the device is used for sealing the pressurizing chamber, so that the sewage in the pressurizing chamber is pressurized, the pressure of the sewage passing through the nanofiltration membrane on the placing frame is ensured to be different, the membrane flux and retention rate of the same nanofiltration membrane under different pressures are realized, and the detection quality of the performance of the nanofiltration membrane is greatly improved.

[0018] 3) The arrangement of the through hole and the fixing groove of the device facilitates the installation and fixation of the sealing plate, so that the purpose of sealing the pressurizing chamber is realized, and the normal pressurization of the device on the sewage is ensured.

[0019] 4) The rubber gasket for sealing the inner wall of the pressurizing chamber and the sealing plate is arranged in the fixing groove of the device, the arrangement of the rubber gasket facilitates the sealing of the sealing plate, and the device facilitates the pressurization of the sewage.

[0020] 5) The arrangement of the sealing piece of the device is used for sealing the liquid collecting tank, the device facilitates the nanofiltration of the sewage, the arrangement of the sealing plate can realize the purpose of sealing the liquid collecting tank and supporting the pressurizing chamber, and the normal work of the pressurizing chamber is ensured.

[0021] 6) The arrangement of the fixing plate of the device is used for supporting the placing frame and realizing the purpose of guiding the installation of the placing frame, and the sealing block and the fixing plate are matched to seal and fix the liquid collecting tank.

[0022] 7) The device holder is arranged to hold the rack, ensure that the nanofiltration membrane on the rack is in a stable state, ensure the nanofiltration efficiency and quality of the nanofiltration membrane on sewage, and the spring can play a buffering role, ensuring that the bottom of the pressure chamber is always in contact with the placement plate.

[0023] 8) The device rack is arranged to fix the nanofiltration membrane, ensuring that the nanofiltration membrane is always in a stable state during operation.

[0024] 9) The recess of the device can play a role in positioning the pressure chamber, and the recess can also play a role in sealing the bottom of the pressure chamber, ensuring normal filtration of the nanofiltration membrane and improving the nanofiltration quality and efficiency of the nanofiltration membrane. BRIEF DESCRIPTION OF DRAWINGS

[0025] ATTACHMENT Figure 1 is a structural schematic diagram of the utility model.

[0026] ATTACHMENT Figure 2 is a schematic diagram of the installation structure of the pressure chamber and the rack in the utility model.

[0027] ATTACHMENT Figure 3 is a schematic diagram of the structure of the sealing element in the utility model.

[0028] ATTACHMENT Figure 4 is a schematic diagram of the installation structure of the sealing plate and the plugging block in the utility model.

[0029] ATTACHMENT Figure 5 is a schematic diagram of the installation structure of the fixed plate and the holder in the utility model.

[0030] ATTACHMENT Figure 6 is a schematic diagram of the installation structure of the fixed plate and the holder in the utility model. Figure 5

[0031] ATTACHMENT Figure 7 is a schematic diagram of the structure of the rack in the utility model.

[0032] ATTACHMENT Figure 8 is a schematic diagram of the structure of the sealing element in the utility model.

[0033] ATTACHMENT Figure 9 is a schematic diagram of the structure of the sealing element in the utility model.

[0034] In the figure:

[0035] 1, the bottom plate;

[0036] 2, the plugging element; 201, the adjusting cylinder; 202, the plugging plate; 203, the side ear;

[0037] 3, the liquid collecting tank;

[0038] ​4, seal; 401, fixing frame; 402, lifting cylinder; 403, sealing plate; 404, blocking block;

[0039] 5, pressurizing chamber; 501, through hole; 502, fixing groove;

[0040] 6, fixing plate; 601, mounting groove;

[0041] 7, lifting piece; 701, lifting plate; 702, spring; 703, guide rod;

[0042] 8, placing frame; 801, placing plate; 802, side plate; 803, nanofiltration membrane; 804, mounting hole; 805, groove;

[0043] 9, air inlet pipe;

[0044] 10, pressure relief valve;

[0045] 11, liquid inlet pipe;

[0046] 12, pressure gauge;

[0047] 13, liquid outlet pipe. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0049] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] As Figure 1 , Figure 2As shown in the figure, a device for testing the performance of nanofiltration membrane, including base plate 1, liquid collecting tank 3, pressurizing chamber 5, sealing element 4, liquid inlet pipe 11 installed on the top of pressurizing chamber 5, air inlet pipe 9, pressure relief valve 10 and pressure gauge 12, the liquid inlet pipe 11 and air inlet pipe 9 are arranged on the top center line of pressurizing chamber 5, the liquid inlet pipe 11 is used for connecting with sewage pipe, and the air inlet pipe 9 is connected with external inert gas storage tank, the pressure relief valve 10 is arranged on one side of pressurizing chamber 5, the pressure gauge 12 is arranged on the other side of the top of pressurizing chamber 5, the liquid collecting tank 3 is arranged on the top of base plate 1, and the liquid collecting tank 3 is connected with base plate 1, the pressurizing chamber 5 is arranged on the sealing element 4, and the pressurizing chamber 5 is connected with the sealing element 4, a placing rack 8 is arranged in the liquid collecting tank 3, a nanofiltration membrane 803 is arranged on the placing rack 8, the bottom of pressurizing chamber 5 penetrates through the sealing element 4 and abuts against the placing rack 8, and the nanofiltration membrane 803 is arranged directly below the pressurizing chamber 5, a blocking element 2 is further arranged on the pressurizing chamber 5, and a liquid discharge pipe 13 is further installed on one side of the bottom of the liquid collecting tank 3, the liquid discharge pipe 13 is used for discharging waste liquid after filtration, so as to facilitate detection of residues in the waste liquid.

[0051] As an optimization scheme of the utility model, Figure 8 As shown in the figure, the blocking element 2 includes adjusting cylinders 201 arranged symmetrically on both sides of the pressurizing chamber 5, side ears 203 and blocking plates 202, and the side ears 203 are fixedly installed on both sides of one end of the blocking plate 202.

[0052] The piston rod of the adjusting cylinder 201 is connected with the side ear 203, the blocking element 2 is used for blocking the pressurizing chamber 5, so as to facilitate pressurization of sewage in the pressurizing chamber 5, ensure that the pressure of sewage passing through the nanofiltration membrane 803 on the placing rack 8 is different, realize membrane flux and retention rate of the same nanofiltration membrane 803 under different pressures, and greatly improve the detection quality of the performance of the nanofiltration membrane 803.

[0053] As an optimization scheme of the utility model, Figure 8 , Figure 9 As shown in the figure, a through hole 501 is formed in the pressurizing chamber 5, a fixing groove 502 is further formed in the side wall of the pressurizing chamber 5, the fixing groove 502 is communicated with the through hole 501, the blocking plate 202 is in sliding fit with the through hole 501, and the side wall of the blocking plate 202 is in sliding fit with the fixing groove 502.

[0054] The through hole 501 and the fixing groove 502 are arranged to facilitate installation and fixation of the blocking plate 202, so as to realize the purpose of sealing the pressurizing chamber 5 and ensure that the device can normally pressurize sewage.

[0055] As an optimization scheme of the utility model, Figure 9As shown, a rubber gasket (not shown in the figure) is provided inside the fixed groove 502 to seal the sealing plate 202 to the inner wall of the pressurization chamber 5. The rubber gasket facilitates the sealing of the sealing plate 202 and facilitates the device to pressurize the sewage.

[0056] As an optimized solution of this utility model, such as Figure 3 , Figure 4 As shown, the sealing element 4 includes a fixing frame 401, a lifting cylinder 402, and a sealing plate 403. The pressure chamber 5 is fixedly installed in the middle of the sealing plate 403, and the bottom of the pressure chamber 5 extends through the sealing plate 403 to the bottom of the sealing plate 403. The fixing frame 401 is fixedly installed on the top of the base plate 1, and the fixing frame 401 is located on one side of the liquid collection tank 3. The fixing frame 401 is used to ensure the normal operation of the lifting cylinder 402 and the sealing plate 403, to ensure that the device can seal the liquid collection tank 3, and to ensure that the nanofiltration membrane 803 is in a sealed state during filtration. The lifting cylinder 402 is fixedly installed on the top of the fixing frame 401, and the piston rod of the lifting cylinder 402 is fixedly installed on the sealing plate 403.

[0057] To ensure the sealing of the collection tank 3, sealing gaskets can be installed at the connection between the sealing plate 403 and the collection tank 3, and at the connection between the sealing block 404 and the fixing plate 6. This ensures that the collection tank 3 is always in a sealed state during operation, preventing unfiltered wastewater from falling into the collection tank 3 during the filtration process and affecting the final test results. The sealed state of the collection tank 3 greatly ensures the accuracy of performance testing.

[0058] The sealing element 4 is used to seal the collection tank 3, which facilitates the nanofiltration of sewage by the device. The sealing plate 403 serves two purposes: sealing the collection tank 3 and supporting the pressurization chamber 5, thus ensuring the normal operation of the pressurization chamber 5.

[0059] As an optimized solution of this utility model, such as Figure 5 As shown, a fixing plate 6 is fixedly installed on the side wall of the liquid collection tank 3, and a sealing block is also fixedly installed at the bottom of the sealing plate 403. The sealing block cooperates with the fixing plate 6.

[0060] The fixing plate 6 is used to support the placement rack 8 and to provide guidance for the installation of the placement rack 8. The sealing block 404 and the fixing plate 6 cooperate to seal and fix the liquid collection tank 3.

[0061] As an optimized solution of this utility model, such as Figure 5 , Figure 6As shown in the fixed plate 6 is also provided with installation groove 601, in the installation groove 601 is provided with the lifting piece 7, the lifting piece 7 includes guide rod 703, lifting plate 701 and spring 702, both ends of the guide rod 703 are fixedly installed on the two side walls of the installation groove 601, the lifting plate 701 is slidingly installed on the guide rod 703, the spring 702 is sleeved on the guide rod 703, and the spring 702 is located between the lifting plate 701 and the inner wall of the installation groove 601.

[0062] The setting of the lifting piece 7 is used for lifting the placing rack 8, guarantees that the nanofiltration membrane 803 on the placing rack 8 is in a stable state, guarantees the nanofiltration efficiency and nanofiltration quality of the nanofiltration membrane 803, and the setting of the spring 702 can play a buffering purpose, guaranteeing that the bottom of the pressurizing chamber 5 is always in abutment with the placing plate 801.

[0063] As an optimization scheme of the utility model, as shown in the figure, Figure 7 As shown in the figure, the placing rack 8 includes a placing plate 801, a nanofiltration membrane 803 and side plates 802 fixedly installed at both ends of the placing plate 801, the placing plate 801 cooperates with the lifting plate 701, the middle part of the placing plate 801 is provided with an installation hole 804, and the nanofiltration membrane 803 is installed in the installation hole 804.

[0064] The setting of the placing rack 8 facilitates fixing the nanofiltration membrane 803, guarantees that the nanofiltration membrane 803 is always in a stable state during the working process, the setting of the side plates 802 can play a guiding purpose for the placing plate 801 and can also prevent the placing plate 801 from tilting during the working process, guaranteeing the normal working of the nanofiltration membrane 803 on the placing plate 801.

[0065] As an optimization scheme of the utility model, as shown in the figure, Figure 7 As shown in the figure, the recess 805 is provided outside the installation hole 804, cooperates with the bottom of the pressurizing chamber 5, and a sealing gasket for sealing the bottom of the pressurizing chamber 5 and the placing plate 801 is further arranged in the recess 805.

[0066] The setting of the recess 805 can play a positioning purpose for the pressurizing chamber 5, and the recess 805 can also play a sealing purpose for the bottom of the pressurizing chamber 5, guaranteeing the normal filtration of the nanofiltration membrane 803 and improving the nanofiltration quality and nanofiltration efficiency of the nanofiltration membrane 803.

[0067] In order to guarantee the accuracy of the detection result, the nanofiltration membrane 803 needs to be replaced after each detection, and the same sewage with different pressures needs to pass through the nanofiltration membrane 803 during detection, and the residual substances in the sewage filtered under different pressures are detected after detection, so that the membrane flux and retention rate of the nanofiltration membrane 803 under different pressures are finally obtained.

[0068] The above is only an example and description of the structure of the utility model, and those skilled in the art can make various modifications or supplements to the described specific embodiments or replace them with similar ways, as long as they do not deviate from the range defined by the structure of the utility model, and should belong to the protection scope of the utility model.

Claims

1. A device for testing the performance of a nanofiltration membrane, comprising a base plate, a liquid collecting tank, a pressurizing chamber, a sealing member, a liquid inlet pipe installed on the top of the pressurizing chamber, an air inlet pipe, a pressure relief valve and a pressure gauge, characterized in that, The liquid inlet pipe and the air inlet pipe are arranged on both sides of the top center line of the pressurizing chamber, the air inlet pipe is connected with an external inert gas tank, the pressure relief valve is arranged on one side of the pressurizing chamber, the pressure gauge is arranged on the other side of the top of the pressurizing chamber, the liquid collecting tank is arranged on the top of the bottom plate and connected with the bottom plate, the pressurizing chamber is arranged on the sealing member and connected with the sealing member, the placing rack is arranged in the interior of the liquid collecting tank, the nanofiltration membrane is arranged on the placing rack, the bottom of the pressurizing chamber penetrates through the sealing member and abuts against the placing rack, the nanofiltration membrane is arranged directly below the pressurizing chamber, the blocking member is further arranged on the pressurizing chamber, and the liquid discharge pipe is further arranged on one side of the bottom of the liquid collecting tank.

2. The device for testing the performance of a nanofiltration membrane according to claim 1, characterized in that, The blocking member comprises adjusting cylinders, side ears and blocking plates which are symmetrically arranged on both sides of the pressurizing chamber, and the side ears are fixedly installed on both sides of one end of the blocking plate.

3. The device for testing the performance of a nanofiltration membrane according to claim 2, characterized in that, A through hole is formed in the pressurizing chamber, and a fixing groove is further formed in the side wall of the pressurizing chamber and communicates with the through hole, the blocking plate is in sliding fit with the through hole, and the side wall of the blocking plate is in sliding fit with the fixing groove.

4. The device for testing the performance of a nanofiltration membrane according to claim 3, characterized in that, A rubber pad for sealing the blocking plate and the inner wall of the pressurizing chamber is arranged in the fixing groove.

5. The device for testing the performance of a nanofiltration membrane according to claim 1, characterized in that, The sealing member comprises a fixing frame, a lifting cylinder and a sealing plate, the pressurizing chamber is fixedly installed in the middle of the sealing plate, the bottom of the pressurizing chamber penetrates through the sealing plate and extends below the sealing plate, the fixing frame is fixedly installed on the top of the bottom plate and located on one side of the liquid collecting tank, the lifting cylinder is fixedly installed on the top of the fixing frame, and the piston rod of the lifting cylinder is fixedly installed on the sealing plate.

6. The device for testing the performance of a nanofiltration membrane according to claim 5, characterized in that, A fixing plate is fixedly installed on the side wall of the liquid collecting tank, and a sealing block is further fixedly installed on the bottom of the sealing plate and cooperates with the fixing plate.

7. The device for testing the performance of a nanofiltration membrane according to claim 6, characterized in that, An installation groove is further formed in the fixing plate, and a lifting piece is arranged in the installation groove, the lifting piece comprises a guide rod, a lifting plate and a spring, both ends of the guide rod are fixedly installed on the side walls of the installation groove, the lifting plate is in sliding fit with the guide rod, and the spring is sleeved on the guide rod and located between the lifting plate and the inner wall of the installation groove.

8. The device for testing the performance of a nanofiltration membrane according to claim 7, characterized in that, The placing rack comprises a placing plate, a nanofiltration membrane and side plates which are fixedly installed on both ends of the placing plate, the placing plate cooperates with the lifting plate, an installation hole is formed in the middle of the placing plate, and the nanofiltration membrane is installed in the installation hole.

9. The device for testing the performance of a nanofiltration membrane according to claim 8, characterized in that, A groove is formed on the outer side of the installation hole and cooperates with the bottom of the pressurizing chamber, and a sealing pad for sealing the bottom of the pressurizing chamber and the placing plate is further arranged in the groove.

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