A needle filter pressure resistance performance detection device

Abstract

The utility model provides a kind of needle filter pressure resistance performance detection device, along nitrogen transmission direction, nitrogen cylinder, pressure reducing valve, monitoring pressure gauge and the air inlet of test cabin outside side are sequentially communicated to constitute gas supply pipeline;The water inlet of the air outlet of test cabin inside side and needle filter upper portion is communicated, and sealing element is installed in the water outlet of needle filter lower portion;The water outlet of needle filter lower portion and sealing element are all located in sealed tube, and the end of sealed tube away from needle filter is closed, and the mixed solution of epoxy resin and curing agent is filled in sealed tube;Test cabin is filled with pure water, and needle filter is located in the pure water inside test cabin.The utility model is matched with pressure reducing valve and monitoring pressure gauge, and the detection demand of different specifications needle filter is satisfied by accurately regulating and controlling pressure;Nitrogen enters needle filter after pressure reduction and pressure stabilization, and the pressure resistance limit is judged by observing bubble generation condition through transparent cabin body.

Description

Technical Field

[0001] This utility model belongs to the field of needle filter performance testing technology, and in particular relates to a needle filter pressure resistance performance testing device. Background Technology

[0002] As a key consumable for laboratory liquid purification, the needle filter consists of a top cover, a filter membrane, and a base. The top cover and base are clamped together to hold the filter membrane in place via hot-melt welding or injection molding to achieve a seal. During the research, development, production, and factory inspection of needle filters, pressure resistance is a core parameter for evaluating their quality, directly affecting the stability and safety of the filtration process.

[0003] Traditional pressure resistance testing of needle filters has several shortcomings: First, the reliability of needle filter outlet sealing is poor, making it difficult to achieve a complete seal of the base outlet; second, the outlet seal cannot stably withstand a maximum test pressure of 1.0 MPa, and is prone to distorting test results due to seal failure. Furthermore, if the sample bursts during testing, the lack of effective protective measures can easily cause injury to operators. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model aims to propose a needle filter pressure resistance performance testing device, which aims to solve the shortcomings of existing needle filters in terms of outlet sealing, pressure resistance and safety.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A device for testing the pressure resistance performance of a needle filter includes a nitrogen cylinder. Along the nitrogen transmission direction, the nitrogen cylinder, a pressure reducing valve, a monitoring pressure gauge, and an air inlet on the outside of the test chamber are sequentially connected to form a gas supply pipeline. The air outlet on the inner side of the test chamber is connected to the water inlet at the top of the needle filter, and a seal is installed in the water outlet at the bottom of the needle filter. The water outlet and seal at the bottom of the needle filter are located inside a sealing tube, which is closed at the end away from the needle filter, and is filled with a mixture of epoxy resin and curing agent. The test chamber is filled with pure water, and the needle filter is located in the pure water inside the test chamber to test the pressure resistance of the needle filter.

[0006] Furthermore, the sealing element is a self-tapping screw, serving as a preliminary sealing component for the outlet of the needle filter.

[0007] Furthermore, the test chamber includes a chamber body, with a connecting pipe installed on one side wall of the chamber body. The outer end of the connecting pipe extends to the outside of the chamber body to form the air inlet of the test chamber, and the inner end of the connecting pipe extends to the inside of the chamber body to form the air outlet of the test chamber. The outer peripheral surface of the connecting pipe on the outside of the chamber body and the outer peripheral surface on the inside of the chamber body are both sequentially fitted with sealing gaskets and fixing nuts along the axial direction to achieve sealing and fastening between the connecting pipe and the chamber body.

[0008] Furthermore, the connecting pipe is connected to the water inlet at the top of the needle filter via a Luer adapter.

[0009] Furthermore, the outer circumferential surface of the connecting pipe is provided with external threads.

[0010] Furthermore, the side wall of the cabin is provided with mounting holes for installing connecting pipes, and the inner wall of the mounting holes is provided with internal threads for connecting to the connecting pipes.

[0011] Furthermore, the cabin is transparent.

[0012] Furthermore, the top of the chamber is provided with an openable cover for installing a needle filter.

[0013] Furthermore, pressure gauges are installed at both the air inlet and outlet of the pressure reducing valve.

[0014] Furthermore, a three-way valve is installed on the pipeline between the pressure reducing valve and the air inlet on the outside of the test chamber. The two ports of the three-way valve are respectively connected to the pressure reducing valve and the air inlet on the outside of the test chamber, and a monitoring pressure gauge is installed on the other port of the three-way valve.

[0015] Compared with existing technologies, the needle filter pressure resistance performance testing device of this utility model has the following advantages: This invention utilizes a nitrogen cylinder, a pressure reducing valve, a pressure gauge, and a test chamber to construct a controllable pressure supply system. Combined with the pure water environment within the test chamber and the sealed structure of the needle filter outlet, it enables precise testing of the pressure resistance performance of needle filters. Nitrogen, as the pressure source, along with the pressure reducing valve and pressure gauge, allows for precise pressure regulation within the range of 0MPa to 1.0MPa, meeting the testing requirements of needle filters of different specifications. After pressure reduction and stabilization, the nitrogen enters the needle filter, and the pressure resistance limit is determined by observing the bubble formation through the transparent chamber.

[0016] This utility model device features an overall modular design, with each component connected quickly via standardized interfaces such as Luer adapters and three-way valves, significantly shortening the installation time of the needle filter. The needle filter outlet adopts a double-sealing structure of "sealing element + epoxy resin filled sealing tube", effectively solving the problem of insufficient pressure resistance of traditional sealing methods, with a sealing performance exceeding 1.MPa, ensuring no leakage during high-pressure testing. Attached Figure Description

[0017] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model; Figure 2 for Figure 1 Enlarged view of part A in the middle; Figure 3 This is a schematic diagram of a needle filter structure; Figure 4 A schematic diagram of the test chamber structure provided for an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Nitrogen cylinder; 2. Pressure reducing valve; 21. Pressure reducing gauge; 3. Monitoring gauge; 4. Test chamber; 41. Chamber body; 42. Connecting pipe; 43. Fixing nut; 44. Luer adapter; 45. Top cover; 5. Needle filter; 6. Seal; 7. Sealing pipe; 8. Three-way valve. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "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," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] 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.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 4 As shown, a needle filter pressure resistance performance testing device includes a nitrogen cylinder 1. Along the nitrogen transmission direction, the nitrogen cylinder 1, pressure reducing valve 2, monitoring pressure gauge 3 and the air inlet on the outside of the test chamber 4 are connected in sequence to form a gas supply pipeline. The air outlet inside the test chamber 4 is connected to the water inlet at the top of the needle filter 5. A seal 6 is installed inside the water outlet at the bottom of the needle filter 5. The water outlet and seal 6 at the bottom of the needle filter 5 are located inside a sealing tube 7. The end of the sealing tube 7 away from the needle filter 5 is closed, and the sealing tube 7 is filled with a mixture of epoxy resin and curing agent. The test chamber 4 is filled with pure water, and the needle filter 5 is located in the pure water inside the test chamber 4 to test the pressure resistance of the needle filter 5.

[0024] This invention utilizes a controllable pressure supply system comprised of a nitrogen cylinder 1, a pressure reducing valve 2, a pressure monitoring gauge 3, and a test chamber 4. Combined with the pure water environment within the test chamber 4 and the sealing structure of the needle filter 5's outlet, it enables precise testing of the needle filter 5's pressure resistance performance. Nitrogen, acting as the pressure source, along with the pressure reducing valve 2 and pressure monitoring gauge 3, allows for precise pressure control within the range of 0MPa to 1.0MPa, meeting the testing requirements of needle filters 5 of different specifications. After pressure reduction and stabilization, the nitrogen enters the needle filter 5, which is placed in the pure water inside the test chamber 4. The pressure resistance limit is determined by observing the generation of air bubbles in the needle filter 5. The needle filter 5's outlet employs a double-sealing structure of "sealed + epoxy resin-filled sealing tube," withstanding pressures exceeding 1.0MPa, thus solving the problem of easy failure in traditional sealing methods.

[0025] The sealing component 6 uses a 304 stainless steel cross-head countersunk self-tapping screw with a thread diameter of 3.5mm and a length of 10mm. It serves as the initial sealing component for the outlet of the needle filter 5. By screwing it into the outlet of the needle filter 5, a mechanical seal is achieved, providing a basic support for the subsequent epoxy resin curing and sealing, and ensuring the initial stability of the sealing structure.

[0026] The sealing tube 7 is made of a PU pneumatic hose with an outer diameter of 12mm, an inner diameter of 8mm, and a length of 50mm. The bottom is completely sealed using a hot melt glue gun. A mixture of epoxy resin and curing agent (mixed at a 2:1 mass ratio and heated at 80℃ for 30 minutes) is injected inside, with the liquid level flush with the top of the sealing tube 7. As a secondary sealing structure for the outlet of the needle filter 5, it works in conjunction with the initial sealing element 6 to form a dual protection of "mechanical sealing + epoxy resin curing sealing," ensuring resistance to a test pressure of 1.0MPa. The straight-through column structure adapted to the needle filter 5 base achieves a gapless seal through vertical insertion, solving the problem of traditional sealing methods being prone to failure due to pressure shocks.

[0027] In a preferred embodiment of this utility model, a valve is provided at the outlet of the nitrogen cylinder 1.

[0028] Specifically, a valve is installed at the outlet of nitrogen cylinder 1 to enable rapid control of the gas supply, facilitating system pre-testing and quick shutdown in emergencies. This effectively avoids equipment damage or safety risks caused by abnormal pressure increases, while also reducing nitrogen consumption during non-testing periods and improving operational safety and economy.

[0029] In a preferred embodiment of this utility model, pressure gauges 21 are provided at both the air inlet and outlet of the pressure reducing valve 2.

[0030] Specifically, pressure gauges 21 are installed at both the inlet and outlet of the pressure reducing valve 2 to monitor the pressure parameters before and after pressure reduction in real time, thereby achieving precise control over the pressure reduction process, avoiding abnormal output pressure caused by the failure of the pressure reducing valve 2, and further improving the stability of pressure regulation and the reliability of detection results.

[0031] In a preferred embodiment of this utility model, a three-way valve 8 is provided on the pipeline between the pressure reducing valve 2 and the air inlet on the outside of the test chamber 4. The two ports of the three-way valve 8 are respectively connected to the pressure reducing valve 2 and the air inlet on the outside of the test chamber 4, and a monitoring pressure gauge 3 is installed on the other port of the three-way valve 8.

[0032] Specifically, the T-shaped three-way valve 8 structure installed on the pipeline between the pressure reducing valve 2 and the air inlet of the test chamber 4 achieves parallel connection of the pressure reducing valve 2, the test chamber 4 and the monitoring pressure gauge 3 through an integrated interface design. It can monitor the pressure parameters before entering the test chamber 4 in real time, forming a secondary verification mechanism for the pressure after pressure reduction, and avoiding pressure misjudgment caused by the failure of a single pressure gauge.

[0033] In a preferred embodiment of this utility model, the test chamber 4 includes a chamber body 41. A connecting pipe 42 is installed on one side wall of the chamber body 41. The outer end of the connecting pipe 42 extends to the outside of the chamber body 41 to form the air inlet of the test chamber 4, and the inner end of the connecting pipe 42 extends to the inside of the chamber body 41 to form the air outlet of the test chamber 4. A sealing gasket and a fixing nut 43 are sequentially fitted along the axial direction on both the outer peripheral surface of the connecting pipe 42 on the outside of the chamber body 41 and the outer peripheral surface on the inner side of the chamber body 41. The cooperation of the sealing gasket and the fixing nut 43 achieves double sealing and fastening between the connecting pipe 42 and the chamber body 41.

[0034] Specifically, the connecting pipe 42 is equipped with a double sealing and fastening structure of "sealing gasket + fixing nut 43" on both the inner and outer sides of the chamber 41. The fixing nut 43 is a stainless steel hexagonal nut. The mechanical clamping force of the fixing nut 43 causes the sealing gasket to undergo elastic deformation, thereby achieving double sealing and fastening between the connecting pipe 42 and the chamber 41. It can withstand pressures of over 1.0 MPa. At the same time, the double-sided fixing design effectively prevents the connecting pipe 42 from loosening due to pressure fluctuations, which could lead to leakage and improve the structural stability of the device during long-term use.

[0035] In a preferred embodiment of this utility model, the inner end of the connecting pipe 42 is connected to the water inlet at the top of the needle filter 5 via a Luer adapter 44.

[0036] Specifically, by utilizing the standardized quick-connect feature of the Luer adapter 44, the needle filter 5 can be plugged and used immediately, significantly shortening the installation time. At the same time, the conical sealing structure of the Luer adapter 44 can effectively ensure the airtightness during pressure transmission, avoiding the impact of leakage at the connection point on the detection accuracy. It is also compatible with the mainstream needle filter 5 interfaces on the market, improving the versatility of the device.

[0037] In a preferred embodiment of the present invention, the outer circumferential surface of the connecting pipe 42 is provided with an external thread; the side wall of the cabin 41 is provided with a mounting hole, and the inner wall of the mounting hole is provided with an internal thread for connecting with the connecting pipe 42.

[0038] Specifically, the connecting pipe 42 is made of stainless steel, and the design of the external thread on the outer circumference and the internal thread of the mounting hole of the cabin 41 achieves a rigid mechanical connection between the connecting pipe 42 and the cabin 41. At the same time, the threaded connection facilitates precise alignment and disassembly maintenance during installation, solving the problem of difficult disassembly and replacement by welding or bonding methods, and improving the ease of maintenance of the device.

[0039] The outer end of the connecting pipe 42 is connected to an internal thread quick-connect adapter, which is connected to the monitoring pressure gauge 3 through a pipeline.

[0040] In a preferred embodiment of this utility model, the cabin 41 is transparent.

[0041] Specifically, the chamber 41 is made of high-strength transparent material with a thickness of 3mm to 10mm. While ensuring sufficient impact resistance, it also ensures clear bubble observation, enabling full-process visual monitoring of the pressure state of the needle filter 5 and the generation of bubbles in the test chamber 4, thereby improving the timeliness and accuracy of pressure limit judgment.

[0042] In a preferred embodiment of the present invention, the top of the chamber 41 is provided with an openable cover 45 for installing a needle filter 5.

[0043] Specifically, the cover and the chamber 41 are connected by a hinge, and with the help of a sealing strip, the chamber 41 is sealed and leak-free; the opening angle of the upper cover 45 is more than 120°, providing ample operating space, facilitating the installation of the needle filter 5, and further improving loading and unloading efficiency.

[0044] The working process of a needle filter pressure resistance performance testing device: 1. Sealing treatment of the 5 outlet of the needle filter 1.1 Preliminary mechanical sealing: Screw the sealing element 6 into the outlet of the needle filter 5 to form a preliminary seal; the sealing element 6 is a 304 stainless steel cross countersunk self-tapping screw with a thread diameter of 3.5mm and a length of 10mm.

[0045] 1.2 Preparation of sealing tube 7: Take a PU pneumatic hose with an outer diameter of 1mm, an inner diameter of 8mm, and a length of 50mm, and completely seal the bottom with hot melt glue stick; After heating the epoxy resin at 80℃ for 30 minutes, mix it with the curing agent at a mass ratio of 2:1 and inject it into the sealed tube 7 until the liquid level is flush with the top.

[0046] 1.3 Secondary curing and sealing: After the initial sealing, the lower end of the needle filter 5 is vertically inserted into the sealing tube 7 and left to stand for 24 hours until the epoxy resin is completely cured, forming a double sealing structure of "mechanical sealing + resin curing".

[0047] 2. Pressure tolerance test 2.1 Preparation of the testing chamber: Open the top cover 45 of the chamber 41, put the sealed needle filter 5 into the chamber, and connect it to the air outlet on the inside of the chamber through the Luer connector.

[0048] 2.2 Test environment preparation: Fill the test chamber with pure water to ensure that the needle filter 5 is completely submerged, and close the top cover 45 of the chamber 41; 2.3 Pressure Control and Observation: Open the valve of nitrogen cylinder 1, and slowly increase the pressure (0MPa~1.0MPa range) through pressure reducing valve 2, while observing the value of pressure gauge 3 in real time; Observe through the transparent chamber 41 whether the needle filter 5 produces bubbles. If bubbles appear, record the current pressure value as the withstand pressure. If the pressure rises to 1.0 MPa and there are no bubbles, it is determined that the withstand pressure is greater than 1.0 MPa.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for testing the pressure resistance performance of a needle filter, characterized in that: Including a nitrogen cylinder, along the nitrogen transmission direction, the nitrogen cylinder, pressure reducing valve, monitoring pressure gauge and air inlet on the outside of the test chamber are connected in sequence to form a gas supply pipeline; The air outlet on the inner side of the test chamber is connected to the water inlet at the top of the needle filter, and a seal is installed in the water outlet at the bottom of the needle filter. The water outlet and the seal at the bottom of the needle filter are both located inside a sealing tube. The end of the sealing tube away from the needle filter is closed, and the sealing tube is filled with a mixture of epoxy resin and curing agent. The test chamber is filled with pure water, and the needle filter is located in the pure water inside the test chamber to test the pressure resistance of the needle filter.

2. The needle filter pressure resistance performance testing device according to claim 1, characterized in that: The sealing element is a self-tapping screw.

3. The needle filter pressure resistance performance testing device according to claim 1, characterized in that: The test chamber includes a chamber body, with a connecting pipe installed on one side wall of the chamber body. The outer end of the connecting pipe extends to the outside of the chamber body to form the air inlet of the test chamber, and the inner end of the connecting pipe extends to the inside of the chamber body to form the air outlet of the test chamber. The outer peripheral surface of the connecting pipe on the outside of the chamber body and the outer peripheral surface on the inside of the chamber body are respectively fitted with sealing gaskets and fixing nuts along the axial direction to achieve sealing and fastening between the connecting pipe and the chamber body.

4. The needle filter pressure resistance performance testing device according to claim 3, characterized in that: The inner end of the connecting pipe is connected to the water inlet at the top of the needle filter via a Luer adapter.

5. The needle filter pressure resistance performance testing device according to claim 4, characterized in that: The outer circumferential surface of the connecting pipe is provided with external threads.

6. The needle filter pressure resistance performance testing device according to claim 5, characterized in that: The side wall of the cabin is provided with mounting holes for installing connecting pipes, and the inner wall of the mounting holes is provided with internal threads for connecting to the connecting pipes.

7. The needle filter pressure resistance performance testing device according to claim 4, characterized in that: The cabin is transparent.

8. The needle filter pressure resistance performance testing device according to claim 4, characterized in that: The top of the chamber is equipped with an openable cover for installing a needle filter.

9. The needle filter pressure resistance performance testing device according to claim 1, characterized in that: Pressure gauges are installed at both the inlet and outlet of the pressure reducing valve.

10. The needle filter pressure resistance performance testing device according to claim 1, characterized in that: A three-way valve is installed on the pipeline between the pressure reducing valve and the air inlet on the outside of the test chamber. The two ports of the three-way valve are connected to the pressure reducing valve and the air inlet on the outside of the test chamber, respectively. A pressure gauge is installed on the other port of the three-way valve.

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