A multifunctional performance testing device for filter materials

Abstract

The present invention proposes a multifunctional performance testing device for filter materials, which specifically relates to the technical field of filter material filtration performance testing, including a bracket, a positioning plate rotatably connected to the bracket, a filter assembly arranged on the positioning plate, a buffer assembly for storing a medium slidably connected to the filter assembly, and a circulating suction assembly arranged between the filter assembly and the buffer assembly; it also includes an air pressure test assembly 1 arranged on the buffer assembly, an air pressure test assembly 2 arranged on the filter assembly, and an air pressure test assembly 3 arranged on the circulating suction assembly, and the filter assembly is connected to an image acquisition system for testing air flow rate and filtration efficiency. The multifunctional performance testing device for filter materials provided by the present invention can test the pressure drop, air flow rate, and filtration efficiency of the filter material at one time. This solution can test the filtration performance of both gas and liquid media in the filter material, and has a simple structure, convenient testing, and accurate data.

Description

Technical Field

[0001] The invention belongs to the technical field of filtering material filtering performance testing, and in particular relates to a multifunctional performance testing device for filtering materials. Background Art

[0002] Most of the existing laboratory particle filter material testing devices are homemade organic glass boxes or modified from flasks. When installing filter materials, they are often difficult to disassemble and assemble, and there is a problem of poor sealing at the filter material installation site. The filter material testing experiment needs to test multiple indicators of the filter material such as pressure drop, filtration efficiency, air flow rate, etc. in one test cycle. However, most existing devices can only test one indicator, and the test method is relatively simple. When testing multiple indicators, different test devices need to be replaced, which not only increases the workload of scientific researchers, but also is not conducive to in-situ characterization of filter material performance; and specific equipment is also limited in the types of filter material tests.

[0003] Therefore, this solution proposes a multifunctional performance testing device for filter materials to solve the above-mentioned technical problems. Summary of the invention

[0004] The purpose of the present invention is to provide a multifunctional performance testing device for filter materials, which solves the technical problem of how to test the pressure drop, air flow rate, and filtration efficiency of the filter materials at one time. The present invention can also test the filtration performance of gas and liquid media in the filter materials, has a simple structure, and has high test accuracy.

[0005] A multifunctional performance testing device for filter material, comprising a bracket, a positioning plate rotatably connected to the bracket, a filter assembly arranged on the positioning plate, a buffer assembly for storing a medium slidably connected to the filter assembly, and a circulating suction assembly arranged between the filter assembly and the buffer assembly;

[0006] It also includes an air pressure test component 1 arranged on the cache component, an air pressure test component 2 arranged on the filter component, and an air pressure test component 3 arranged on the circulating suction component. The filter component is connected to an image acquisition system for testing air flow rate and filtration efficiency.

[0007] Preferably, the filter assembly includes a conical cylinder with the large end facing upward and the small end facing downward, a limit ring coaxially fixed to the top of the conical cylinder, and a filter support plate coaxially fixed to the inner side of the conical cylinder, the upper end surface of the filter support plate is provided with filter material, and the filter support plate is provided with multiple through holes.

[0008] The filter material is arranged on the filter support plate, and the through holes are used for the medium to pass through. Meanwhile, the size of the through holes needs to ensure that the filter material does not leak.

[0009] Preferably, the image acquisition system includes an observation tube coaxially fixed to the bottom end of the filter support plate, a positioning ring coaxially connected to the bottom end of the observation tube, a camera fixed on the positioning ring, and a speed sensor extending into the interior of the observation tube, the camera and the speed sensor are both connected to a host computer, and the observation tube is made of transparent glass.

[0010] Preferably, the cache assembly includes a cache cylinder slidably connected to the positioning ring up and down, a support plate coaxially fixed to the inner side of the cache cylinder, an injection pipe coaxially connected to the support plate, an electromagnetic valve arranged on the injection pipe, a top plate closed at the top of the cache cylinder, an inlet pipe arranged on the top plate, and a control valve arranged on the inlet pipe, and both sides of the cache cylinder are respectively connected to the lifting cylinder.

[0011] Preferably, the circulating suction assembly includes a circulating tube 2 whose one end is connected to the outside of the conical cylinder, an air bag connected to the other end of the circulating tube 2, and a circulating tube 1 whose one end is connected to the air bag, the other end of the circulating tube 1 is connected to the top plate, and the air bag is fixed in the glass box for limiting position.

[0012] Preferably, the air pressure testing assembly 1 comprises an upper barometer and a lower barometer arranged on the cache tube, and the upper barometer and the lower barometer are respectively arranged above and below the support plate.

[0013] Preferably, the air pressure testing assembly 2 includes an air pressure gauge 1 fixed to the conical cylinder, and the air pressure gauge 1 is arranged below the filter support plate.

[0014] Preferably, the air pressure testing component three includes a barometer two and a sealing ring arranged on the airbag; the sealing ring is closed and connected at the connection position between the barometer two and the airbag.

[0015] Preferably, barometer 1, barometer 2, and barometer 3 in this solution are all connected to the host computer through a communication interface.

[0016] Preferably, the bottom end of the conical cylinder is connected to one end of an outflow pipe, the other end of the outflow pipe is arranged toward the containing box, a pressure sensor is arranged at the bottom end of the containing box, and the pressure sensor is connected to a host computer.

[0017] Preferably, the positioning plate is connected to a rotation driving structure; the rotation driving structure comprises a vertically arranged fixed cylinder, a sliding rod with one end slidably arranged in the fixed cylinder, a moving bar with one end vertically fixedly connected to the outer side of the sliding rod, a meshing portion fixed to the other end of the sliding rod, a gear meshingly connected to the meshing portion, a rotating shaft with one end coaxially connected to the gear, and the other end of the rotating shaft is fixedly connected to the positioning plate;

[0018] The moving bar slides through the long through hole arranged on the outer side of the fixing tube.

[0019] The beneficial effects of the present invention are as follows:

[0020] (1) The image acquisition system designed in this scheme achieves the following technical effects:

[0021] First, for liquid media, use a camera to take continuous high-speed photos to monitor the running time of the liquid from the top to the bottom of the observation tube, as well as the amount of liquid in the entire observation tube per unit time, so as to determine its pressure drop and filtration efficiency changes;

[0022] Second, for gas media, the velocity sensor installed on the observation tube can be used to determine the flow rate of the gas after passing through the filter material, and then estimate the changes in pressure drop and filtration efficiency;

[0023] (2) A cache component is provided to cooperate with the support plate and the solenoid valve to temporarily store the liquid medium. A scale is provided on the outside of the cache cylinder so that people can intuitively observe the volume of the medium to be filtered, paving the way for the subsequent calculation of the filtration efficiency;

[0024] (3) An air bag and a glass box are designed, and a barometer is set on the air bag. The volume of the air bag is determined by the Clapeyron equation. After multiple filtration cycles, the volume of the air bag is detected again, and the filtration efficiency and pressure drop of the gas medium are determined based on the volume change.

[0025] (4) In this scheme, multiple air pressure test components are designed to effectively test the pressure drop and filtration efficiency of the gas medium during filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the performance testing device in the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the support assembly in the present invention.

[0028] Figure 3 It is a schematic diagram of the structure of the cache component in the present invention.

[0029] Figure 4 It is a schematic diagram of the structure of the filter assembly in the present invention.

[0030] Figure 5 It is a schematic diagram of the connection structure of the airbag in the present invention.

[0031] Figure 6 It is a structural schematic diagram of the image acquisition system in the present invention.

[0032] Figure 7It is a structural schematic diagram of the rotation drive structure in the present invention.

[0033] Among them, the accompanying drawings are marked as follows: 1. bracket; 2. containing box; 3. outflow pipe; 4. conical cylinder; 41. limit ring; 42. filter support plate; 43. observation tube; 44. positioning ring; 5. lifting cylinder; 6. collecting cylinder; 7. buffer cylinder; 71. support plate; 72. solenoid valve; 73. perfusion tube; 8. lower barometer; 9. upper barometer; 10. inlet tube; 11. circulation tube one; 12. glass box; 13. air bag; 14. barometer two; 15. circulation tube two; 16. rotating drive structure; 161. fixed cylinder; 162. sliding rod; 163. moving bar; 164. meshing part; 165. gear; 166. rotating shaft. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0035] See also Figure 1-Figure 7 A multifunctional performance testing device for filter materials, comprising a bracket 1, a positioning plate rotatably connected to the bracket 1, a filter assembly arranged on the positioning plate, a buffer assembly for storing a medium slidably connected to the filter assembly, and a circulating suction assembly arranged between the filter assembly and the buffer assembly;

[0036] It also includes an air pressure test component 1 set on the cache component, an air pressure test component 2 set on the filter component, and an air pressure test component 3 set on the circulation suction component. The filter component is connected to an image acquisition system for testing air flow rate and filtration efficiency.

[0037] The filter assembly includes a conical cylinder 4 with the large end facing upward and the small end facing downward, a limit ring 41 coaxially fixed to the top of the conical cylinder 4, and a filter support plate 42 coaxially fixed to the inner side of the conical cylinder 4. The upper end surface of the filter support plate 42 is provided with filter material, and a plurality of through holes are provided on the filter support plate 42.

[0038] Preferably, the conical tube 4 is transparent to facilitate observation by people, for example, high-strength glass may be used.

[0039] The image acquisition system includes an observation tube 43 coaxially fixed to the bottom end of the filter support plate 42, a positioning ring 44 coaxially connected to the bottom end of the observation tube 43, a camera fixed on the positioning ring 44, and a speed sensor extending into the observation tube 43. The camera and the speed sensor are both connected to the host computer, and the observation tube 43 is made of transparent glass.

[0040] A positioning ring 44 is designed to seal the camera to avoid the influence of the medium. It should be noted that the multiple through holes (the size of the through holes is determined according to the actual situation, and the principle is to ensure that the filter material does not fall and does not affect the passage of the medium) provided on the filter support plate 42 are all connected to the observation tube 43. The part of the filter support plate 42 that does not contact the observation tube 43 is not designed with a through hole, which is helpful for sealing the camera and observation.

[0041] It should be noted that the filter support plate 42 designed in this scheme is originally designed to set granular or flexible filter materials such as activated carbon, filter membrane, etc. on the filter support plate 42; this scheme is also suitable for the filtering performance test of the filter plate. At this time, the filter support plate 42 can be directly replaced with the filter plate to be tested, and it can be flexibly set according to the actual situation.

[0042] The cache assembly includes a cache cylinder 7 slidably connected to the positioning ring 44 up and down, a support plate 71 coaxially fixed on the inner side of the cache cylinder 7, an infusion pipe 73 coaxially connected to the support plate 71, an electromagnetic valve 72 arranged on the infusion pipe 73, a top plate closed at the top end of the cache cylinder 7, an inlet pipe 10 arranged on the top plate, and a control valve arranged on the inlet pipe 10. Both sides of the cache cylinder 7 are respectively connected to the lifting cylinder 5.

[0043] The buffer tube 7 is transparent, for example, it can be made of high-strength glass, and a scale line is designed on the outer side of its upper end. At the same time, the density of the liquid is known in advance, and the mass of the medium liquid can be known in advance, which is convenient for the subsequent calculation of the filtration efficiency;

[0044] The circulating suction assembly includes a circulating tube 2 15 whose one end is connected to the outside of the conical tube 4, an air bag 13 connected to the other end of the circulating tube 2 15, and a circulating tube 11 whose one end is connected to the air bag 13. The other end of the circulating tube 11 is connected to the top plate, and the air bag 13 is fixed in the glass box 12 for limiting.

[0045] The air pressure test assembly 1 includes an upper barometer 9 and a lower barometer 8 arranged on the buffer tube 7, and the upper barometer 9 and the lower barometer 8 are respectively arranged on the upper and lower sides of the support plate 71.

[0046] The air pressure test assembly 2 includes an air pressure gauge 1 fixed to the conical cylinder 4 , and the air pressure gauge 1 is arranged below the filter support plate 42 .

[0047] The air pressure test assembly three includes a barometer two 14 and a sealing ring arranged on the airbag 13 ; the sealing ring is sealed and connected at the connection position between the barometer two 14 and the airbag 13 .

[0048] The bottom end of the conical cylinder 4 is connected to one end of the outflow pipe 3, and the other end of the outflow pipe 3 is arranged toward the containing box 2. A pressure sensor is arranged at the bottom end of the containing box 2, and the pressure sensor is connected to the host computer for sensing the gravity change of the containing box 2.

[0049] The gravity change in the containing box 2 is sensed by the pressure sensor, and the filtration efficiency of the liquid is quantitatively calculated from the weight comparison before and after.

[0050] The positioning plate is connected to the rotation driving structure 16; the rotation driving structure 16 includes a vertically arranged fixed cylinder 161, a sliding rod 162 with one end slidingly arranged in the fixed cylinder 161, a moving bar 163 with one end vertically fixedly connected to the outer side of the sliding rod 162, a meshing portion 164 fixed to the other end of the sliding rod 162, a gear 165 meshingly connected to the meshing portion 164, and a rotating shaft 166 with one end coaxially connected to the gear 165, and the other end of the rotating shaft 166 is fixedly connected to the positioning plate;

[0051] The moving bar 163 slides through the long through hole provided on the outer side of the fixing tube 161 .

[0052] By moving the moving bar 163 up and down, the meshing portion 164 and the gear 165 are meshed and separated.

[0053] A collecting cylinder 6 is provided on one side of the rotating driving structure 16. When the filtration is completed and the impurities on the filter material need to be removed and collected, the lifting cylinder 5 is started to separate the cache cylinder 7 and the conical cylinder 4 (it should be noted that a rubber layer is provided on the outer side of the limiting ring 41, and the rubber layer slides up and down on the inner side of the cache cylinder 7, similar to the principle of a syringe, and has good sealing performance). Then, under the rotation adjustment of the rotating shaft 166, the conical cylinder 4 rotates as a whole, and then the filter material and filtered impurities are poured into the collecting cylinder 6.

[0054] The specific working process of the present invention is:

[0055] This solution is mainly for liquid media and gas media. Now the test methods for these two media are explained separately:

[0056] When testing the filtration performance of the gas medium, it is necessary to test the pressure drop, air flow rate, and filtration efficiency. When testing the gas pressure drop, the valves on the circulation pipe 1 11 and the circulation pipe 2 15 are closed, and gas is first introduced into the airbag 13 and temporarily stored. The air pressure in the airbag 13 is determined according to the barometer 2 14, and the volume V1 of the gas is estimated according to the Clapeyron equation. Then, the buffer cylinder 7 and the conical cylinder 4 are evacuated by a vacuum pump to reduce the internal air pressure to a certain value V2. To simplify the design, the vacuum pump is not marked in the attached drawings, and this is hereby explained.

[0057] A suction pump 1 is provided on the circulation pipe 11, and a suction pump 2 is provided on the circulation pipe 2 15. Then, the valves on the circulation pipe 11 and the circulation pipe 2 15 are opened. Under the action of the suction pump 1, the gas in the airbag 13 is guided to the buffer cylinder 7 and enters the conical cylinder 4. During this process, the reading changes of the upper barometer 9, the lower barometer 8, the barometer 1 and the barometer 2 14 are observed. After a certain time t1, the valve on the circulation pipe 11 is closed, and the suction pump 2 continues to work until the readings on the upper barometer 9, the lower barometer 8, the barometer 1 and the barometer 2 14 reach the initial readings after vacuuming. The valve on the circulation pipe 2 15 is quickly closed, and the reading V3 on the barometer 2 14 in the airbag 13 is observed. The change in air pressure before and after the airbag 13 is V1-V3. According to this change, the filtration amount of the gas medium is determined, and then the filtration efficiency is determined and calculated;

[0058] Observe the changes in the readings on the upper barometer 9, the lower barometer 8, the barometer 1 and the barometer 2 14 at different time points, determine the pressure drop and estimate the air flow rate through the air pressure; due to the viewing angle, the barometer 1 is not highlighted in the attached figure, but it does not affect the implementation of the technical solution, so it is hereby explained;

[0059] According to the data recorded by the speed sensor and the host computer, the air flow rate under the filter material is determined, thereby determining the speed change of the air medium at various positions;

[0060] After obtaining the above data, the overall filtering performance of the filter material can be quantitatively determined.

[0061] It should be noted that, in order to simplify the design, the suction pump 1, the suction pump 2 and each valve in this solution are no longer marked in detail in the accompanying drawings, and this is hereby explained.

[0062] When testing the filtration performance of a liquid medium, it is necessary to test indicators such as pressure drop, air flow rate, and filtration efficiency; when testing the liquid pressure drop, liquid is poured into the top of the buffer cylinder 7, and the solenoid valve 72 is closed at the same time. A scale line is set at the upper end of the buffer cylinder 7, so that the volume V4 and mass m1 of the liquid can be obtained. Then, the solenoid valve 72 is opened, and the liquid descends into the filter material. Through the image acquisition system, the liquid passing through the filter material is continuously photographed to observe the descending speed and amount of the liquid. Since the pressure above and below the filter material is constantly changing, the pressure test is not easy and inaccurate. In this solution, the pressure drop is indirectly judged by observing the descending speed of the liquid below the filter material.

[0063] When testing the filtration efficiency, the pressure sensor at the bottom of the containing box 2 is tested within a specific time t2 to determine the mass m2 of the liquid flowing out of the containing box 2 and combine it with the initial mass m1 to determine the filtration efficiency.

[0064] In order to further illustrate the pressure drop, filtration efficiency and air flow rate in this solution, the following existing concepts are first provided to facilitate people to understand this technical solution.

[0065] Pressure drop: A simple filter is formed by using a filter medium to separate the container into an upper and lower chamber. The suspension is added to the upper chamber and enters the lower chamber under pressure through the filter medium to become filtrate. Solid particles are trapped on the surface of the filter medium to form filter residue (or filter cake). During the filtration process, the filter residue layer stored on the surface of the filter medium gradually thickens, and the resistance of the liquid passing through the filter residue layer increases accordingly, and the filtration speed decreases. When the filter chamber is full of filter residue or the filtration speed is too low, stop filtering, remove the filter residue, and regenerate the filter medium to complete a filtration cycle. The liquid must overcome resistance when passing through the filter residue layer and the filter medium, so there must be a pressure difference on both sides of the filter medium, which is the driving force for filtration. Increasing the pressure difference can accelerate filtration, but the particles that are deformed after being pressed are easy to block the pores of the filter medium when the pressure difference is large, and the filtration is slowed down.

[0066] Filtration efficiency: Filtration efficiency refers to the ratio of the amount of dust captured by the filter to the amount of dust in the unfiltered air. It is usually used to measure the performance of the filter. This ratio can be expressed in different ways, such as gravimetric efficiency, counting efficiency or particle size counting efficiency, depending on the method of expressing the dust concentration.

[0067] Air flow rate: look at the inlet and outlet diameters, then based on the flow rate, multiply the flow rate by one hour and then multiply it by the inlet and outlet area to get the flow rate.

[0068] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A multifunctional performance testing device for filter materials, comprising a bracket (1), and a positioning plate rotatably connected to the bracket (1), characterized in that: The positioning plate is provided with a filter assembly, the filter assembly is slidably connected with a buffer assembly for storing a medium, and a circulating suction assembly is provided between the filter assembly and the buffer assembly; It also includes an air pressure test component 1 arranged on the cache component, an air pressure test component 2 arranged on the filter component, and an air pressure test component 3 arranged on the circulation suction component, wherein the filter component is connected to an image acquisition system for testing air flow rate and filtration efficiency; The filter assembly comprises a conical cylinder (4) arranged with its large end facing upward and its small end facing downward, a limiting ring (41) coaxially fixed to the top of the conical cylinder (4), and a filter support plate (42) coaxially fixed to the inner side of the conical cylinder (4), wherein the upper end surface of the filter support plate (42) is provided with filter material, and the filter support plate (42) is provided with a plurality of through holes; The image acquisition system comprises an observation tube (43) coaxially fixed to the bottom end of the filter support plate (42), a positioning ring (44) coaxially connected to the bottom end of the observation tube (43), a camera fixed to the positioning ring (44), and a speed sensor extending into the observation tube (43), wherein the camera and the speed sensor are both connected to a host computer, and the observation tube (43) is made of transparent glass; The cache assembly comprises a cache barrel (7) slidably connected to the positioning ring (44) up and down, a support plate (71) coaxially fixed to the inner side of the cache barrel (7), a perfusion pipe (73) coaxially connected to the support plate (71), a solenoid valve (72) arranged on the perfusion pipe (73), a top plate sealed at the top end of the cache barrel (7), an inlet pipe (10) arranged on the top plate, and a control valve arranged on the inlet pipe (10), and both sides of the cache barrel (7) are respectively connected to the lifting cylinder (5); The circulating suction assembly comprises a circulating pipe 2 (15) whose one end is connected to the outside of the conical cylinder (4), an air bag (13) connected to the other end of the circulating pipe 2 (15), and a circulating pipe 1 (11) whose one end is connected to the air bag (13), the other end of the circulating pipe 1 (11) is connected to the top plate, and the air bag (13) is fixed in the glass box (12) for limiting position; The air pressure test assembly 1 comprises an upper barometer (9) and a lower barometer (8) arranged on the buffer cylinder (7), and the upper barometer (9) and the lower barometer (8) are arranged above and below the support plate (71), respectively.

2. A multifunctional performance testing device for filter materials according to claim 1, characterized in that: The air pressure test assembly 2 comprises an air pressure gauge 1 fixed on the conical cylinder (4), and the air pressure gauge 1 is arranged below the filter support plate (42).

3. The multifunctional performance testing device for filter material according to claim 1, characterized in that: The air pressure testing assembly three comprises an air pressure gauge two (14) connected to the air bag (13) and a sealing ring.

4. The multifunctional performance testing device for filter material according to claim 1, characterized in that: The bottom end of the conical cylinder (4) is connected to one end of the outflow pipe (3), and the other end of the outflow pipe (3) is arranged toward the containing box (2). A pressure sensor is arranged at the bottom end of the containing box (2), and the pressure sensor is connected to the upper computer.

5. The multifunctional performance testing device for filter material according to claim 1, characterized in that: The positioning plate is connected to the rotation driving structure (16); the rotation driving structure (16) comprises a vertically arranged fixed cylinder (161), a sliding rod (162) with one end slidably arranged in the fixed cylinder (161), a moving bar (163) with one end vertically fixedly connected to the outer side of the sliding rod (162), a meshing portion (164) fixed to the other end of the sliding rod (162), a gear (165) meshingly connected to the meshing portion (164), and a rotating shaft (166) with one end coaxially connected to the gear (165), and the other end of the rotating shaft (166) is fixedly connected to the positioning plate; The moving strip (163) slides through a long through hole arranged on the outside of the fixing tube (161).

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