Metal sintered felt filtration performance test tool

Abstract

This utility model discloses a testing fixture for the filtration performance of sintered metal felt, relating to the technical field of filtration materials. The utility model includes an upper test cylinder, a lower test cylinder, a differential pressure sensor, and a backwashing assembly. The upper test cylinder is located above the lower test cylinder. An upper flange is fixed to the lower port of the upper test cylinder, and a lower flange is fixed to the upper port of the lower test cylinder. Differential pressure sensors are installed on the upper and lower flanges. An annular insert is fixed to the bottom surface of the upper flange, and an annular gasket is installed outside the annular insert. An annular slot is formed on the top surface of the lower flange, and an annular gasket is installed inside the annular slot. This utility model, by incorporating the upper and lower test cylinders, differential pressure sensor, upper flange, lower flange, and backwashing assembly, solves the problems of the lack of high differential pressure testing function, the inability to effectively guarantee the sealing performance of sintered metal felt filtration during testing, and the lack of cyclic fatigue testing function in sintered metal felt testing fixtures.

Description

Technical Field

[0001] This utility model belongs to the technical field of filter materials, and in particular relates to a test fixture for the filter performance of metal sintered felt. Background Technology

[0002] Metal sintered felt (metal fiber sintered felt) is a three-dimensional porous material formed by non-woven lay-up, layering, and high-temperature vacuum sintering of metal fibers (such as stainless steel, titanium, nickel, etc.) with diameters in the micrometer range (2-80μm). Multi-layer metal fiber felt creates a pore gradient with layers of different pore sizes, allowing for controllable high filtration accuracy and a larger dirt-holding capacity compared to single-layer felt. It can continuously maintain the filtration function of the filter cloth and features a three-dimensional network structure, high porosity, large surface area, and uniform pore size distribution, exhibiting excellent structural performance. Before being sold, metal sintered felt products need to undergo certain tests to meet qualification standards. The most important of these is the filtration performance test of the metal sintered felt; however, the following drawbacks still exist in actual testing:

[0003] The key to testing metal sintered felt is to simulate actual working conditions. Testing the filtration performance of metal sintered felt requires meeting its working scenario. For example, how to achieve high pressure differential testing? Simply relying on test fixtures to fix the metal sintered felt obviously cannot meet the high pressure differential requirements.

[0004] Secondly, for the filtration test of metal sintered felt, it is more important to ensure the airtightness and prevent side leakage, gaps, etc. from affecting the filtration. Otherwise, the test data will be inaccurate. In addition, the edges of metal sintered felt are rough, and conventional sealing methods are difficult to guarantee sufficient sealing effect.

[0005] Finally, cyclic fatigue testing is also a necessary testing procedure for sintered metal felts. It mainly tests the service life of the sintered metal felts and whether the filtration performance changes after multiple cycles. This inevitably requires cyclic fatigue testing, but obviously the existing testing equipment does not have this effect. Utility Model Content

[0006] The purpose of this utility model is to provide a metal sintered felt filtration performance testing fixture. By setting up an upper test cylinder, a lower test cylinder, a differential pressure sensor, an upper flange, a lower flange, a first rubber gasket, a second rubber gasket, a first annular gasket, a second annular gasket, an annular insert, an annular slot, and a backwashing assembly, it solves the problems of the lack of high differential pressure testing function, the inability to effectively guarantee the sealing performance of metal sintered felt filtration during testing, and the lack of cyclic fatigue testing function in metal sintered felt testing fixtures.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] This utility model is a testing fixture for the filtration performance of sintered metal felt, including an upper test cylinder, a lower test cylinder, a differential pressure sensor, and a backwashing assembly. The upper test cylinder is located above the lower test cylinder. An upper flange is fixed to the outside of the lower port of the upper test cylinder, and a lower flange is fixed to the outside of the upper port of the lower test cylinder. A differential pressure sensor is installed outside the upper and lower flanges. A backwashing assembly is installed inside the lower test cylinder.

[0009] The bottom surface of the upper flange is fixed with an annular insert block with a conical cross section. An annular gasket is provided outside the annular insert block. An annular rubber gasket and rubber gasket one are fixed to the bottom of the upper flange on the inner and outer rings of the annular gasket one.

[0010] The top surface of the lower flange is provided with an annular slot, and an annular gasket is provided in the annular slot; a metal sintered felt body is also provided between the upper flange and the lower flange.

[0011] Furthermore, the backwashing assembly includes a first ring tube located inside the lower test cylinder and a second ring tube located inside the first ring tube. A connecting pipe arranged in a ring array is fixed between the first ring tube and the second ring tube. Spray nozzles arranged in a ring array are fixed to the upper part of both the first ring tube and the second ring tube.

[0012] Furthermore, a water inlet pipe is fixedly connected to the periphery of the first ring pipe, and the end of the water inlet pipe away from the first ring pipe extends through the side wall of the lower test cylinder and is connected to a quick-connect connector.

[0013] Furthermore, the differential pressure sensor is provided with a high-pressure end and a low-pressure end. The high-pressure end probe of the differential pressure sensor is connected to the side of the upper test cylinder near the metal sintered felt body, and the low-pressure end probe of the differential pressure sensor is connected to the side of the lower test cylinder near the metal sintered felt body.

[0014] Furthermore, a fixing ring is fixed to the outside of the lower test cylinder, and a support leg arranged in a ring array is fixed to the bottom surface of the fixing ring, with the bottom end of the support leg lower than the bottom end of the lower test cylinder.

[0015] Furthermore, the upper surface of the metal sintered felt body contacts the bottom surfaces of rubber pad one, rubber pad two, and annular pad one, and the lower surface of the metal sintered felt body contacts the upper surface of the lower flange and annular pad two. A grid is fixed inside the lower flange, and the middle part of the metal sintered felt body is located above the grid.

[0016] Furthermore, a pressure relief valve is fixed to the middle periphery of the upper test cylinder, a dust inlet is fixed through the upper periphery of the upper test cylinder, and an inlet is provided on the top surface of the upper test cylinder and an outlet is provided on the bottom surface of the lower test cylinder.

[0017] This utility model has the following beneficial effects:

[0018] This invention solves the problem of the lack of high differential pressure testing function in metal sintered felt testing fixtures by setting up an upper test cylinder, a lower test cylinder, and a differential pressure sensor. The metal sintered felt body to be tested is placed between the upper and lower test cylinders, and the upper and lower test cylinders are sealed together. Then, the fluid to be filtered enters from the top of the upper test cylinder, passes through the metal sintered felt body, and is then discharged from the outlet at the bottom of the lower test cylinder. During this process, the high-pressure end and low-pressure end of the differential pressure sensor are connected to the upper and lower test cylinders respectively to test the pressure difference inside the upper and lower test cylinders, thereby testing the filtration effect under differential pressure conditions.

[0019] This invention solves the problem of ineffective sealing during metal sintered felt filtration testing by setting up an upper flange, a lower flange, rubber gasket one, rubber gasket two, annular gasket one, annular gasket two, annular insert, and annular slot. Annular gasket two is placed inside the annular slot on the lower flange, and then the metal sintered felt is laid on top of the lower flange. The upper test cylinder is then placed on top, so that annular gasket one, outside the annular insert on the bottom surface of the upper flange, abuts against the metal sintered felt and inserts into annular gasket two. Simultaneously, rubber gasket one and rubber gasket two also press against the upper surface of the metal sintered felt. Finally, the upper and lower flanges are locked and fixed with bolts and nuts. The cross-sections of annular gasket one, annular gasket two, annular slot, and annular insert are all conical, providing a larger contact surface, and the conical pressing structure is more compact, resulting in better sealing.

[0020] This invention solves the problem of the lack of cyclic fatigue testing function in the testing fixture by setting up a backwashing component. After a period of testing, the quick-connect connector in the backwashing component is connected to the external cleaning water. The cleaning water enters the first ring pipe through the inlet pipe, and then enters the second ring pipe through the connecting pipe. Finally, all nozzles spray water upward to rinse the metal sintered felt, realizing the backwashing operation. Then, the filtration test is carried out to realize the cyclic fatigue testing function. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0022] Figure 1 A three-dimensional view of a testing fixture for the filtration performance of a metal sintered felt;

[0023] Figure 2 for Figure 1 A stereoscopic view from another perspective;

[0024] Figure 3 This is a cross-sectional view showing the connection between the upper and lower test cylinders;

[0025] Figure 4 This is a cross-sectional view of the upper test cylinder;

[0026] Figure 5 for Figure 4 Enlarged view of the structure at point A in the image;

[0027] Figure 6 This is a cross-sectional view of the lower test cylinder;

[0028] Figure 7 This is a cross-sectional view of the lower test cylinder after the grid has been removed and the metal sintered felt body has been laid out.

[0029] Figure 8 for Figure 7 Enlarged view of the structure at point B in the image;

[0030] Figure 9 This is a structural diagram of the backwashing assembly.

[0031] Figure label:

[0032] 1. Upper test cylinder; 101. Upper flange; 1011. Annular insert; 1012. Annular gasket one; 1013. Rubber gasket one; 1014. Rubber gasket two; 102. Pressure relief valve; 103. Dust inlet; 2. Lower test cylinder; 201. Lower flange; 2011. Annular slot; 2012. Annular gasket two; 202. Grille; 3. Fixing ring; 301. Support leg; 4. Differential pressure sensor; 401. High pressure end; 402. Low pressure end; 5. Metal sintered felt body; 6. Backwash assembly; 601. Annular pipe one; 602. Annular pipe two; 603. Connecting pipe; 604. Nozzle; 605. Water inlet pipe; 606. Quick-connect coupling. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0034] Please see Figure 1-9 As shown, this utility model is a testing fixture for the filtration performance of sintered metal felt, including an upper test cylinder 1, a lower test cylinder 2, a differential pressure sensor 4, and a backwashing assembly 6. The upper test cylinder 1 is located above the lower test cylinder 2. An upper flange 101 is fixed to the outside of the lower port of the upper test cylinder 1, and a lower flange 201 is fixed to the outside of the upper port of the lower test cylinder 2. The differential pressure sensor 4 is installed outside the upper flange 101 and the lower flange 201. The backwashing assembly 6 is installed inside the lower test cylinder 2.

[0035] The upper test cylinder 1 serves as the inlet, receiving the fluid to be filtered, while the lower test cylinder 2 serves as the outlet, outputting the filtered fluid. The upper test cylinder 1 and the lower test cylinder 2 are connected by an upper flange 101 and a lower flange 201, and are secured with bolts and nuts. Using the differential pressure sensor 4, a high-pressure zone is formed inside the upper test cylinder 1, and a low-pressure zone is formed inside the lower test cylinder 2. The filtration performance under high pressure differential conditions is tested. After a certain period of filtration testing, the metal sintered felt body 5 is rinsed using the backwashing assembly 6, and then the filtration test is performed again, followed by a cyclic fatigue strength test.

[0036] An annular insert 1011 with a tapered cross section is fixed to the bottom surface of the upper flange 101. An annular gasket 1012 is provided outside the annular insert 1011. Annular rubber gasket 2 1014 and rubber gasket 1013 are fixed to the bottom of the upper flange 101 on the inner and outer rings of the annular gasket 1012.

[0037] The top surface of the lower flange 201 is provided with an annular slot 2011, and an annular gasket 2012 is provided inside the annular slot 2011; a metal sintered felt body 5 is also provided between the upper flange 101 and the lower flange 201.

[0038] An annular gasket 2012 is placed inside the annular slot 2011 on the lower flange 201. Then, a metal sintered felt is laid on top of the lower flange 201, and the upper test cylinder 1 is covered. The annular gasket 1012 outside the annular insert 1011 on the bottom surface of the upper flange 101 abuts against the metal sintered felt and is inserted into the annular gasket 2. At the same time, the rubber gasket 1013 and the rubber gasket 2014 are also pressed on the upper surface of the metal sintered felt to ensure a seal. The cross-sections of the annular gasket 1012, the annular gasket 2012, the annular slot 2011, and the annular insert 1011 are all conical, which has a larger contact surface and a tighter conical pressing structure, resulting in better sealing.

[0039] The backwash assembly 6 includes a first annular tube 601 located inside the lower test cylinder 2 and a second annular tube 602 located inside the first annular tube 601. A connecting pipe 603 arranged in a ring array is fixed between the first annular tube 601 and the second annular tube 602. A nozzle 604 arranged in a ring array is fixed on the upper part of both the first annular tube 601 and the annular tube.

[0040] A water inlet pipe 605 is also fixed through the periphery of the ring pipe 601, and the end of the water inlet pipe 605 away from the ring pipe 601 extends through the side wall of the lower test tube 2 and is connected to a quick connector 606.

[0041] After a period of testing, the quick-connect fitting 606 in the backwash assembly 6 is connected to the external cleaning water. The cleaning water enters the first ring pipe 601 through the inlet pipe 605, and then enters the second ring pipe 602 through the connecting pipe 603. Finally, all nozzles 604 spray water upwards to rinse the metal sintered felt, thus achieving the backwashing operation. Then, a filtration test is performed. This process is repeated to achieve the cyclic fatigue test of the metal sintered felt body 5.

[0042] The differential pressure sensor 4 is provided with a high pressure end 401 and a low pressure end 402. The probe of the high pressure end 401 of the differential pressure sensor 4 is connected to the side of the upper test cylinder 1 near the metal sintered felt body 5, and the probe of the low pressure end 402 of the differential pressure sensor 4 is connected to the side of the lower test cylinder 2 near the metal sintered felt body 5.

[0043] The pressure difference between the upper test cylinder 1 and the lower test cylinder 2 is tested by connecting the high pressure end 401 and the low pressure end 402 of the differential pressure sensor 4 to the upper test cylinder 1 and the lower test cylinder 2 respectively. This tests the filtration effect under high pressure difference. If the pressure difference is too small, it indicates that the metal sintered felt body 5 is damaged or has leakage.

[0044] A fixing ring 3 is fixed to the outside of the lower test cylinder 2. Support legs 301 arranged in a ring array are fixed to the bottom surface of the fixing ring 3. The bottom end of the support legs 301 is lower than the bottom end of the lower test cylinder 2.

[0045] A fixing ring 3 is set outside the lower test cylinder 2, and the lower test cylinder 2 is supported by the support leg 301 under the fixing ring 3, so that the lower test cylinder 2 is raised to a certain height from the ground, which facilitates operation.

[0046] The upper surface of the metal sintered felt body 5 contacts the bottom surfaces of the first rubber pad 1013, the second rubber pad 1014 and the first annular pad 1012, and the lower surface of the metal sintered felt body 5 contacts the upper surface of the lower flange 201 and the second annular pad 2012. A grid 202 is fixed inside the lower flange 201, and the middle part of the metal sintered felt body 5 is located above the grid 202.

[0047] The grid 202 is used to provide some support for the middle part of the metal sintered felt body 5, so as to prevent the metal sintered felt body 5 from deforming under high pressure differential conditions and affecting the test results.

[0048] A pressure relief valve 102 is fixed to the middle periphery of the upper test cylinder 1, and a dust inlet 103 is fixed through the upper periphery of the upper test cylinder 1. The top surface of the upper test cylinder 1 is provided with an inlet, and the bottom surface of the lower test cylinder 2 is provided with an outlet.

[0049] After the test is completed, first open the pressure relief valve 102 to release the pressure. During the test, in order to test the filtration effect, it is usually necessary to add a certain amount of dust to the fluid to be filtered. For example, Arizona test dust is used to test PM2.5, and ISOMTD standard dust is used to test oil filtration. Therefore, the dust inlet 103 is set to facilitate direct connection to the dust generator; the inlet is connected to the feed pump / pressure source, and the outlet is connected to the flow meter, back pressure valve and downstream pipeline.

[0050] The specific working principle of this utility model is as follows: First, the lower test cylinder 2 is supported on the ground by the fixing ring 3 and the support leg 301. Then, an annular gasket 2012 is placed in the annular slot 2011 on the lower flange 201. Next, the metal sintered felt is laid on top of the lower flange 201, and then the upper test cylinder 1 is covered, so that the annular gasket 1012 outside the annular insert 1011 on the bottom surface of the upper flange 101 abuts against the metal sintered felt and is inserted into the annular gasket 2. At the same time, the rubber gasket 1013 and the rubber gasket 2014 are also pressed on the upper surface of the metal sintered felt. Finally, the upper flange 101 and the lower flange 201 are locked and fixed by bolts and nuts to complete the installation. Then, the inlet on the top surface of the upper test cylinder 1 is connected to the feed pump to input the fluid to be filtered, and the dust inlet 103 is connected to the dust generator. The outlet at the bottom of the lower test cylinder 2 is connected to the flow meter. The test includes the pressure gauge, back pressure valve, and downstream pipelines. During the test, the high-pressure end 401 and low-pressure end 402 of the differential pressure sensor 4 are connected to the upper test cylinder 1 and the lower test cylinder 2, respectively, to test the pressure difference between the upper test cylinder 1 and the lower test cylinder 2, thereby testing the filtration effect under differential pressure. If the pressure difference is too small, it indicates that the metal sintered felt body 5 is damaged or has a leakage effect, and the machine needs to be stopped in time. After a period of testing, the quick-connect connector 606 in the backwash assembly 6 is connected to the external cleaning water. The cleaning water enters the first ring pipe 601 through the water inlet pipe 605, and then enters the second ring pipe 602 through the connecting pipe 603. Finally, all nozzles 604 spray water upward to rinse the metal sintered felt, realizing the backwashing operation. Then, the filtration test is carried out. This process is repeated to carry out the cyclic fatigue test. Only after all tests are qualified can the product be shipped for sale.

[0051] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.

Claims

1. A metal sintered felt filtration performance test tool, comprising an upper test cylinder (1), a lower test cylinder (2), a differential pressure sensor (4) and a backwash assembly (6), characterized in that: The upper test cylinder (1) is located above the lower test cylinder (2). An upper flange (101) is fixed to the lower port of the upper test cylinder (1), and a lower flange (201) is fixed to the upper port of the lower test cylinder (2). Differential pressure sensors (4) are installed on the outside of the upper flange (101) and the lower flange (201). A backwashing assembly (6) is installed inside the lower test cylinder (2). The bottom surface of the upper flange (101) is fixed with an annular insert (1011) with a conical cross section. An annular gasket (1012) is provided outside the annular insert (1011). Annular rubber gaskets (1014) and rubber gasket (1013) are fixed at the bottom of the upper flange (101) on the inner and outer rings of the annular gasket (1012). The top surface of the lower flange (201) is provided with an annular slot (2011), and an annular gasket (2012) is provided in the annular slot (2011); a metal sintered felt body (5) is also provided between the upper flange (101) and the lower flange (201).

2. The filter performance test tool for metal sintered felt according to claim 1, characterized in that: The backwashing assembly (6) includes a first ring pipe (601) located inside the lower test cylinder (2) and a second ring pipe (602) located inside the first ring pipe (601). A connecting pipe (603) arranged in a ring array is fixed between the first ring pipe (601) and the second ring pipe (602). A nozzle (604) arranged in a ring array is fixed on the upper part of the first ring pipe (601) and the ring pipe.

3. The metal sintered felt filtration performance testing fixture according to claim 2, characterized in that: A water inlet pipe (605) is also fixed through the periphery of the first ring pipe (601), and the end of the water inlet pipe (605) away from the first ring pipe (601) extends through the side wall of the lower test tube (2) and is connected to a quick connector (606).

4. The filter performance test tool for metal sintered felt according to claim 1, characterized in that: The differential pressure sensor (4) is provided with a high-pressure end (401) and a low-pressure end (402). The probe of the high-pressure end (401) of the differential pressure sensor (4) is connected to the side of the upper test cylinder (1) near the metal sintered felt body (5), and the probe of the low-pressure end (402) of the differential pressure sensor (4) is connected to the side of the lower test cylinder (2) near the metal sintered felt body (5).

5. The filter performance test tool for metal sintered felt according to claim 1, characterized in that: A fixing ring (3) is fixed to the outside of the lower test cylinder (2). The bottom surface of the fixing ring (3) is fixed with legs (301) arranged in a ring array. The bottom end of the legs (301) is lower than the bottom end of the lower test cylinder (2).

6. The filter performance test tool for metal sintered felt according to claim 1, characterized in that: The upper surface of the metal sintered felt body (5) contacts the bottom surfaces of the first rubber pad (1013), the second rubber pad (1014), and the first annular pad (1012). The lower surface of the metal sintered felt body (5) contacts the upper surface of the lower flange (201) and the second annular pad (2012). A grid (202) is fixed inside the lower flange (201), and the middle part of the metal sintered felt body (5) is located above the grid (202).

7. The filter performance test tool for metal sintered felt according to claim 1, characterized in that: A pressure relief valve (102) is fixed on the middle periphery of the upper test cylinder (1), a dust inlet (103) is fixed through the upper periphery of the upper test cylinder (1), and an inlet is provided on the top surface of the upper test cylinder (1) and an outlet is provided on the bottom surface of the lower test cylinder (2).

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