Ultrafiltration membrane air tightness detection device

Abstract

The utility model relates to the technical field of air tightness detection, and provides an ultrafiltration membrane air tightness detection device, which comprises a connecting pipe, two sealing plugs and two fixing pieces, and is characterized in that the connecting pipe is provided with an air hole; the sealing plug is arranged on the connecting pipe in a sliding and sealing mode. The two fixing pieces are fixedly arranged on the connecting pipe and abut against the sides, away from the air hole, of the two sealing plugs respectively, the two sealing plugs are made to abut against and seal the two ends of the ultrafiltration membrane center pipe respectively, and at least one fixing piece is detachably connected with the connecting pipe. According to the utility model, through the arrangement of the connecting pipe, the sealing plugs and the fixing piece, after the connecting pipe extends into the central pipe of the ultrafiltration membrane, the gaps between the two ends of the ultrafiltration membrane and the connecting pipe are plugged by using the two sealing plugs, so that air can be supplied into the ultrafiltration membrane to complete the air tightness detection of the ultrafiltration membrane, and the air tightness detection device is simple in structure, convenient to operate and high in practicability. And the device is suitable for ultrafiltration membranes with different specifications.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to an ultrafiltration membrane air tightness detection device. Background Art

[0002] Ultrafiltration membranes are widely used in the fields of purified water preparation and wastewater treatment. They are usually composed of a shell, end caps, a membrane center tube, and membrane filaments. Air tightness is a basic indicator for ensuring the performance of ultrafiltration membranes. Air tightness testing is required both in factory inspection and in actual applications.

[0003] The utility model with patent publication number CN214309340U discloses an air tightness detection device for ultrafiltration membrane elements, wherein the ultrafiltration membrane elements include a central tube and a filter membrane wound outside the central tube, and the air tightness detection device includes a frame; a detection component, and the detection component is arranged on the frame; wherein the detection component includes a fixed end cap and a movable end cap arranged at both ends of the frame, and the ultrafiltration membrane element can be selectively abutted between the fixed end cap and the movable end cap, and the detection component includes an air inlet and an exhaust port arranged on the fixed end cap, and the air inlet corresponds to the filter membrane, and the exhaust port corresponds to the central tube. The advantages of the utility model are: the ultrafiltration membrane element is detected by designing the frame and the detection component, the detection process is stable and reliable, and personnel can observe the change of air pressure to determine whether the quality of the plate top ultrafiltration membrane element is qualified, the detection efficiency and accuracy are high, the stability of the air tightness detection device is increased, and the product quality of the ultrafiltration membrane element is ensured.

[0004] In the above technical scheme, in order to detect the air tightness of the ultrafiltration membrane, a support frame, a fixed end cover and a movable end cover are set, one end of the central tube is sealed, and a gas of a certain pressure is injected into the other end thereof, and the air tightness is judged by observing the change in air pressure. However, the appearance of the detection device is large, and when detecting ultrafiltration membranes of different models, the support height of the support frame needs to be adjusted, which makes the detection operation of the ultrafiltration membrane more inconvenient and reduces the efficiency of the ultrafiltration membrane air tightness detection. Utility Model Content

[0005] In view of this, the utility model proposes an ultrafiltration membrane air tightness detection device, which can quickly complete the air tightness detection operation of the ultrafiltration membrane and improve the efficiency of the ultrafiltration membrane air tightness detection.

[0006] The technical solution of the utility model is implemented as follows: The utility model provides an ultrafiltration membrane air tightness detection device, including a connecting pipe, two sealing plugs and two fixing parts, wherein:

[0007] The connecting tube is provided with an air hole, the connecting tube is used to penetrate the central tube of the ultrafiltration membrane, and the air hole is located in the central tube of the ultrafiltration membrane;

[0008] The sealing plug is slidably and sealingly arranged on the connecting pipe;

[0009] The two fixing members are fixedly arranged on the connecting pipe and respectively abut against the side of the two sealing plugs away from the air hole, so that the two sealing plugs abut against and seal against the two ends of the ultrafiltration membrane central tube respectively, and at least one of the fixing members is detachably connected to the connecting pipe.

[0010] On the basis of the above technical solution, preferably, the fixing member comprises a nut, and the nut is connected to the connecting pipe through threaded cooperation.

[0011] More preferably, the fixing member further comprises a sealing ring, which is fixed between the nut and the sealing plug and seals against the connecting pipe.

[0012] More preferably, it further comprises two ventilation valves, which are detachably fixed on both ends of the connecting pipe and are communicated with the interior thereof.

[0013] More preferably, it further comprises a pressure gauge and a three-way joint, and one end of the connecting pipe, one of the vent valves and the pressure gauge are fixedly connected via the three-way joint.

[0014] More preferably, the nut is arranged on the outside of the connecting pipe, and the interface of the three-way joint is connected to the inner side of one end of the connecting pipe through threaded fitting.

[0015] On the basis of the above technical solution, preferably, the length of the air hole along the axial direction of the connecting pipe is greater than its length along the tangent direction of the circumference of the connecting pipe.

[0016] More preferably, the air hole is provided in plurality.

[0017] More preferably, the air hole is arranged at a middle position of the circumference of the connecting pipe.

[0018] Based on the above technical solution, preferably, the sealing plug is in a conical shape, and the outer diameter of one end thereof is smaller than the inner diameter of the ultrafiltration membrane central tube, and the outer diameter of the other end thereof is larger than the inner diameter of the ultrafiltration membrane central tube.

[0019] Compared with the prior art, the ultrafiltration membrane air tightness detection device of the utility model has the following beneficial effects:

[0020] (1) By providing a connecting pipe, a sealing plug and a fixing piece, after the connecting pipe is inserted into the central tube of the ultrafiltration membrane, two sealing plugs are used to seal the gap between the two ends of the ultrafiltration membrane and the connecting pipe, so that air can be supplied into the ultrafiltration membrane to complete the air tightness test of the ultrafiltration membrane. The air tightness test device has a simple structure, is easy to operate, and is suitable for ultrafiltration membranes of different specifications;

[0021] (2) By providing a long strip of air holes and arranging it in the middle position of the connecting pipe, the air supply stability of the air tightness detection device can be improved to ensure the stable operation of the ultrafiltration membrane air tightness detection operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A three-dimensional diagram of an ultrafiltration membrane air tightness detection device of the utility model;

[0024] Figure 2 This is an exploded view of one end of an ultrafiltration membrane air tightness detection device of the utility model without a pressure gauge;

[0025] Figure 3 An exploded view of an ultrafiltration membrane air tightness detection device of the utility model with a pressure gauge at one end;

[0026] Figure 4 It is a stereoscopic diagram of a connecting pipe in an ultrafiltration membrane air tightness detection device of the utility model;

[0027] Figure 5 The utility model is a three-dimensional diagram of the interior of an ultrafiltration membrane in an ultrafiltration membrane air tightness detection device.

[0028] Among them: 1. connecting pipe; 101, air hole; 2. sealing plug; 3. fixing piece; 31, nut; 32, sealing ring; 4. vent valve; 5. pressure gauge; 6. three-way joint; 7. ultrafiltration membrane center tube. DETAILED DESCRIPTION

[0029] The following will be combined with the specific implementation of the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] The detection device is used to detect the air tightness of the ultrafiltration membrane, such as a hollow fiber ultrafiltration membrane assembly with a central reinforcement tube disclosed in the invention patent with patent publication number CN102363108A, which includes a housing, an end cap, a membrane filament and an ultrafiltration membrane central tube 7, such as Figure 1 As shown, the housing and the end cover are combined to form a sealing structure, and the ultrafiltration membrane central tube 7 passes through the sealing structure. Figure 5 As shown, the membrane filaments are arranged inside this sealing structure. After the raw water is input into one end of the ultrafiltration membrane central tube 7, the raw water enters the membrane filaments through the through holes on the surface of the ultrafiltration membrane central tube 7, and is purified by the membrane filaments into pure water. The pure water is then transported to the storage device through the joint on the outer shell or the end cover, and the concentrated water is discharged from the other end of the ultrafiltration membrane central tube 7.

[0031] like Figure 1-5 As shown, an ultrafiltration membrane air tightness detection device of the utility model comprises a connecting pipe 1, two sealing plugs 2, two fixing parts 3, two ventilation valves 4, a pressure gauge 5 and a three-way joint 6.

[0032] The connecting tube 1 is used to penetrate the central tube 7 of the ultrafiltration membrane. An air hole 101 is opened on the connecting tube 1. Both ends of the connecting tube 1 are located outside the central tube 7 of the ultrafiltration membrane, and the air hole 101 is located inside the central tube 7 of the ultrafiltration membrane.

[0033] The sealing plug 2 is used to seal the connecting pipe 1 and the ultrafiltration membrane central pipe 7 , and the sealing plug 2 is slidably and sealingly arranged on the connecting pipe 1 .

[0034] The fixing member 3 is used to abut and fix the sealing plug 2. The two fixing members 3 are fixedly arranged on the connecting tube 1 and respectively abut the side of the two sealing plugs 2 away from the pore 101, so that the two sealing plugs 2 are respectively abutted and sealed against the two ends of the ultrafiltration membrane central tube 7. When the ultrafiltration membrane is tested, the joints on the ultrafiltration membrane housing and the end cover are first closed, and then one end of the connecting tube 1 is closed, and compressed air of a certain pressure is injected into the other end of the connecting tube 1. Finally, the ultrafiltration membrane and the detection device are placed in a water pool together. If the air tightness of the ultrafiltration membrane is good, no air leakage will occur and no bubbles will be generated on the ultrafiltration membrane. If there are defects in its air tightness, air leakage will occur, so that bubbles will appear on the ultrafiltration membrane to determine the air tightness of the ultrafiltration membrane. In order to install the detection device on the ultrafiltration membrane central tube 7, at least one fixing member 3 is detachably connected to the connecting tube 1. The detection device has a simple structure, is convenient to carry and operate, and is suitable for ultrafiltration membranes of different specifications.

[0035] like Figure 2 and Figure 3 As shown, the fixing member 3 includes a nut 31 and a sealing ring 32 . The nut 31 is connected to the connecting pipe 1 through threaded cooperation. The fixing member 3 and the connecting pipe 1 can be detachably fixedly connected by rotating the nut 31 .

[0036] The sealing ring 32 is fixed between the nut 31 and the sealing plug 2 and is sealed against the connecting pipe 1, thereby improving the sealing performance of the sealing plug 2 and the connecting pipe 1 and ensuring the accuracy of the detection result of the detection device.

[0037] The vent valve 4 is used to selectively block the end of the connecting pipe 1. The two vent valves 4 are detachably fixed at both ends of the connecting pipe 1 and are connected to the inside thereof. The end of the connecting pipe 1 can be blocked by rotating the vent valve 4 to control the switch.

[0038] The pressure gauge 5 is used to detect the pressure of the gas in the connecting pipe 1 .

[0039] The three-way joint 6 is used to connect the pressure gauge 5 to the connecting pipe 1. One end of the connecting pipe 1, one of the vent valves 4 and the pressure gauge 5 are fixedly connected through the three-way joint 6. Figure 1 and Figure 3 As shown, the three-way connector 6 has three interconnected connectors, which are respectively connected to the connecting pipe 1, the vent valve 4 and the pressure gauge 5.

[0040] In order to increase the length of the ultrafiltration membrane that the device can adapt to, the connection positions of the nut 31, the tee joint 6 and the connecting pipe 1 should be staggered, so that the nut 31 is set on the outside of the connecting pipe 1, and the interface of the tee joint 6 is connected to the inner side of one end of the connecting pipe 1 through threaded fitting. The corresponding threads on the connecting pipe 1 are preferably only set at its two ends.

[0041] In order to ensure that the air for air tightness detection is smoothly injected into the connecting tube 1, the inner diameter of the air hole 101 should be enlarged and the shape of the air hole 101 should be adapted to the narrow and long connecting tube 1, that is, the length of the air hole 101 along the axial direction of the connecting tube 1 should be greater than its length along the tangential direction of the connecting tube 1; similarly, multiple air holes 101 can be provided.

[0042] In order to improve the injection uniformity of the gas used for air tightness detection and ensure the stability of the detection device, it is preferred that the air hole 101 is set in the middle position of the side of the connecting pipe 1.

[0043] like Figure 1 As shown, the sealing plug 2 is conical in shape, and the outer diameter of one end thereof is smaller than the inner diameter of the ultrafiltration membrane central tube 7, and the outer diameter of the other end thereof is larger than the inner diameter of the ultrafiltration membrane central tube 7, thereby improving the sealing effect between the sealing plug 2 and the connecting tube 1.

[0044] The method of using the ultrafiltration membrane air tightness detection device of the utility model is as follows:

[0045] First, close all joints on the ultrafiltration membrane housing, remove the vent valve 4, nut 31, sealing ring 32 and sealing plug 2 at the end of the connecting pipe 1 away from the pressure gauge 5 one by one, and then insert the end of the connecting pipe 1 away from the pressure gauge 5 into the ultrafiltration membrane center tube 7, when the air hole 101 is located in the ultrafiltration membrane center tube 7, and install the vent valve 4, nut 31, sealing ring 32 and sealing plug 2 at the end of the connecting pipe 1 away from the pressure gauge 5 on the connecting pipe 1, so that the two sealing plugs 2 seal the gap between the two ends of the ultrafiltration membrane center tube 7 and the connecting pipe 1, then close the vent valve 4 at the end of the connecting pipe 1 away from the pressure gauge 5, open the other vent valve 4, and inject a certain pressure of gas into the opened vent valve 4, finally close all the vent valves 4, and use the reading of the pressure gauge 5 to judge the air tightness performance of the ultrafiltration membrane, or directly put the ultrafiltration membrane and the detection device into the water pool, and judge the air tightness performance of the ultrafiltration membrane by whether bubbles are generated and the bubble generation condition.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultrafiltration membrane air tightness detection device, characterized in that: It comprises a connecting pipe (1), two sealing plugs (2) and two fixing members (3), wherein: The connecting tube (1) is provided with an air hole (101), the connecting tube (1) is used to penetrate the central tube (7) of the ultrafiltration membrane, and the air hole (101) is located inside the central tube (7) of the ultrafiltration membrane; The sealing plug (2) is slidably and sealingly arranged on the connecting pipe (1); The two fixing members (3) are fixedly arranged on the connecting pipe (1) and respectively abut against the two sealing plugs (2) on the side away from the air hole (101), so that the two sealing plugs (2) are respectively abutted and sealed against the two ends of the ultrafiltration membrane central tube (7), and at least one of the fixing members (3) is detachably connected to the connecting pipe (1).

2. The ultrafiltration membrane air tightness detection device according to claim 1, characterized in that: The fixing member (3) comprises a nut (31), and the nut (31) is connected to the connecting pipe (1) through threaded matching.

3. An ultrafiltration membrane air tightness detection device as claimed in claim 2, characterized in that: The fixing member (3) further comprises a sealing ring (32), wherein the sealing ring (32) is fixed between the nut (31) and the sealing plug (2) and is in sealing contact with the connecting pipe (1).

4. The ultrafiltration membrane air tightness detection device according to claim 3, characterized in that: It also comprises two ventilation valves (4), which are detachably fixed at both ends of the connecting pipe (1) and are connected to the interior thereof.

5. The ultrafiltration membrane air tightness detection device according to claim 4, characterized in that: It also comprises a pressure gauge (5) and a three-way joint (6), and one end of the connecting pipe (1), one of the ventilation valves (4) and the pressure gauge (5) are fixedly connected via the three-way joint (6).

6. An ultrafiltration membrane air tightness detection device as claimed in claim 5, characterized in that: The nut (31) is arranged on the outside of the connecting pipe (1), and the interface of the three-way joint (6) is connected to the inside of one end of the connecting pipe (1) through threaded fitting.

7. The ultrafiltration membrane air tightness detection device according to claim 1, characterized in that: The length of the air hole (101) along the axial direction of the connecting pipe (1) is greater than its length along the tangential direction of the circumference of the connecting pipe (1).

8. An ultrafiltration membrane air tightness detection device as claimed in claim 7, characterized in that: A plurality of air holes (101) are provided.

9. An ultrafiltration membrane air tightness detection device as claimed in claim 8, characterized in that: The air hole (101) is arranged at a middle position on the circumference of the connecting pipe (1).

10. The ultrafiltration membrane air tightness detection device according to claim 1, characterized in that: The sealing plug (2) is in a conical shape, and the outer diameter of one end thereof is smaller than the inner diameter of the ultrafiltration membrane central tube (7), and the outer diameter of the other end thereof is larger than the inner diameter of the ultrafiltration membrane central tube (7).

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