CN111220524A - Air permeability testing device and method for porous filtering material - Google Patents
Air permeability testing device and method for porous filtering material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 71
- 230000035699 permeability Effects 0.000 title claims abstract description 67
- 238000012360 testing method Methods 0.000 title claims abstract description 48
- 238000001914 filtration Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000009471 action Effects 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims description 43
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 abstract description 23
- 239000000835 fiber Substances 0.000 abstract description 22
- 239000003570 air Substances 0.000 description 99
- 239000007789 gas Substances 0.000 description 14
- 239000000428 dust Substances 0.000 description 10
- 239000011148 porous material Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 6
- 239000000779 smoke Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000002657 fibrous material Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention provides a device and a method for testing the air permeability of a porous filtering material, wherein the testing device can reasonably set the shape of a port of an air pipe or the shape of a fixed part according to the shape of a tested surface so as to realize that external environment air passes through the tested surface under the action of vacuum negative pressure of a vacuum device, and the filtering air speed passing through the tested surface is maintained in a preset flow speed range by adjusting an adjusting valve in the vacuum device, so that the pressure difference of air flow passing through the tested surface is measured by a digital micro-pressure meter, and whether the air permeability of the tested surface meets the requirement is judged by taking the pressure difference as the basis; the test device provided by the invention can realize the integral air permeability test of the product formed by the porous filter material, and can also divide the product into a plurality of parts, measure the air permeability of each part and evaluate the air permeability of different parts of the product. For example, the air permeability test of each section of the filter cartridge may be performed by dividing the porous ceramic fiber filter cartridge into a plurality of sections to evaluate the air permeability of the porous ceramic fiber filter cartridge at different positions from the front end to the rear end.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a device and a method for testing the air permeability of a porous filtering material.
Background
The fiber material is solidified by using a binder by utilizing the fine form and the mutually staggered porous structure of the fiber material to form a product with a specific shape, and the fiber material has wide application in the aspects of heat insulation, smoke filtration, composite material prefabrication and the like.
The porous ceramic fiber filter cylinder is usually prepared from aluminum silicate ceramic fibers and an inorganic binder by a vacuum suction filtration method, has the characteristics of high temperature resistance, low gas resistance, high dust removal efficiency, easy regeneration and the like, can realize the aim of integrated treatment of flue gas dust removal and denitration after being loaded with an SCR denitration catalyst, and has important application in the field of boiler flue gas treatment.
The air permeability of the porous ceramic fiber filter cylinder determines the smoke filtering efficiency, plays a key role in the performance of the filtering performance of the porous ceramic fiber filter cylinder, and is one of the important performance indexes of the porous ceramic fiber filter cylinder. In practical engineering applications, the pressure loss of the dust collector is generally used for characterizing the air permeability of the porous ceramic fiber filter cartridge.
The pressure loss is also called pressure drop and pressure loss, and is expressed by the full pressure difference of the smoke at the inlet and the outlet of the device, which substantially reflects the mechanical energy consumed by the smoke passing through the dust removal device and is in direct proportion to the power consumed by the fan. On the premise of ensuring the dust removal efficiency, the pressure loss should be as small as possible. The smaller the pressure loss is, the lower the power consumption of the fan is, the lower the mechanical energy consumed by the smoke through the dust remover is, namely, the smoke is easy to pass through the porous filtering material, thereby visually embodying the quality of the air permeability of the material.
At present, as the application technology of the high-temperature flue gas dust removal equipment with the porous ceramic fiber filter cartridge is mature day by day, the online monitoring technology of the pressure loss of the dust remover is also perfected day by day. However, it is still lacking in fine evaluation of the material of the porous ceramic fiber filter cartridge portion. In order to ensure the flue gas treatment capacity of the dust remover, the size of the porous ceramic fiber filter cylinder is generally large, and due to the difference of local performance, the weak part is easy to become a short plate of the porous ceramic fiber filter cylinder. Therefore, it is necessary to develop a detection device capable of evaluating the air permeability of the ceramic fiber material to satisfy the research and development of the air permeability of the porous ceramic fiber filter cartridge and other porous materials.
How to solve the above-mentioned defects in the prior art is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a device for testing the air permeability of a porous filtering material, which comprises a controller, a pressure detection part, a flow velocity detection part, a fixing part, a vacuum device and an air pipe, wherein the controller is connected with the pressure detection part;
one port of the air pipe is connected with the air extraction port of the vacuum device, the vacuum device provides vacuum negative pressure for the inner cavity of the air pipe, so that environmental gas passes through the tested surface of the tested porous filter material to enter the air pipe (2) to form a gas filtering state;
the fixing component is used for fixing the tested porous filter material at the other end of the air pipe, and the tested surface of the tested porous filter material forms a flow surface communicated with the inner cavity of the air pipe and the external environment;
the pressure detection component is used for detecting the pressure difference of gas passing through the tested surface;
the flow velocity detection component is used for detecting the flow velocity parameter of the gas passing through the tested surface;
the controller controls the vacuum device to act according to the flow speed parameters detected by the flow speed detection part so that the flow speed of the air flow passing through the tested surface is within a preset flow speed range, and whether the pressure difference detected by the pressure detection part is within an air permeability requirement range under the working condition of the preset flow speed range is judged.
According to the air permeability testing device for the porous filtering material, the shape of the port of the air pipe or the shape of the fixing part can be reasonably set according to the shape of the tested surface, so that external environment air passes through the tested surface under the action of vacuum negative pressure of the vacuum device, the air speed passing through the tested surface is maintained within a preset flow speed range by adjusting the working condition of the vacuum device, the pressure difference of air flow passing through the tested surface is further judged, and whether the air permeability of the tested surface meets the requirement or not is judged according to the pressure difference.
That is, the testing device herein can quantitatively evaluate the quality of the air permeability of the porous material by the pressure difference formed on both sides of the porous material when the gas passes through the porous material under the same filtering wind speed condition, so as to satisfy the analysis of the local or overall air permeability of the porous material.
The test device provided by the invention can realize the whole air permeability test of the product formed by the porous filter material, and of course, the product can be divided into a plurality of parts, and the air permeability of each part is measured to realize the test of the air permeability of different parts of the product. For example, the air permeability test of each section of the filter cartridge can be realized by dividing the porous ceramic fiber filter cartridge into a plurality of sections, so as to evaluate the air permeability of the porous ceramic fiber filter cartridge from the front end to the rear end at different positions; of course, the porous ceramic fiber filter cartridge can be integrally arranged on the air pipe to realize the measurement of the integral air permeability of the filter cartridge.
Optionally, the pressure detection component includes a digital micro-pressure meter, and the digital micro-pressure meter is disposed inside the air duct and near the installation position of the tested porous filter material.
Optionally, the flow rate detection component includes a flow meter, and the flow meter is disposed inside the air duct and near the installation position of the tested porous filter material; a flow velocity calculation module is prestored in the controller, and the flow velocity calculation module calculates the flow velocity of the current working condition passing through the tested surface according to the flow meter detection parameters and the flow surface parameters of the tested surface.
Optionally, the operation panel is used for communicating with the controller; the operation panel comprises a parameter input area and a parameter display area, wherein the parameter input area is used for inputting one or more of size parameters of the tested surface, a preset flow speed range or the shape of the tested surface to the controller; the parameter display area is used for displaying one or more of the detection parameters of the pressure detection component, the detection parameters of the flow rate detection component, the working parameters of the vacuum device or the flow rate passing through the tested surface under the current working condition according to the instruction of the controller.
Optionally, the vacuum device includes a vacuum pump and a regulating valve, and the controller regulates an opening degree of the regulating valve so that a flow rate passing through the surface to be tested is within a preset flow rate range.
Optionally, the vacuum device comprises a buffer tank disposed downstream of the regulating valve.
Optionally, the vacuum device further comprises a precision filter disposed between the buffer tank and the inlet of the vacuum pump.
Optionally, a flange is fixed to the other end of the air pipe, the fixing component includes a threaded rod, a pressing plate and a nut, one end of the threaded rod penetrates through the pressing plate and the flange and is fixedly connected with the nut, and under the action of the threaded rod and the nut, the porous filter material to be tested is compressed between the pressing plate and the flange; and the cross section of the inner hole of the flange is the same as that of the end of the air pipe in size.
Optionally, when the tested porous filter material is a cylindrical shell and the tested surface is annular, the pressing plate is a plate body, during installation, the pressing plate closes an opening at one end of the cylindrical shell, and a through hole for installing the threaded rod is formed in the edge of the pressing plate;
or,
when the porous filter material to be tested is a flat plate, the surface to be tested is a plane; the pressing plate is a plate body with a through hole formed in the middle, and the size of the through hole is equal to that of the tested surface.
In addition, the invention also provides a method for testing the air permeability of the porous filter material, which specifically comprises the following steps:
mounting the tested surface of the tested porous filter material on one port of the air pipe to form an airflow surface;
starting a vacuum device to enable the inner cavity of the air pipe to form negative pressure, so that the ambient air passes through the surface to be tested, then detecting the flow velocity parameter of the air passing through the surface to be tested, and simultaneously detecting the pressure difference of the air flow before and after the air flow passes through the surface to be tested;
and adjusting the flow velocity of the air flow passing through the tested surface within a preset flow velocity range, and judging whether the pressure difference is within the air permeability requirement range under the working condition of the preset flow velocity range.
The method for testing the air permeability of the porous filtering material is implemented on the basis of the device for testing the air permeability of the porous filtering material, so that the method for testing the air permeability of the porous filtering material also has the technical effect of the device for testing the air permeability of the porous filtering material.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for testing air permeability of a porous filter material according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a platen according to an embodiment of the present invention;
FIG. 3 is a schematic view of a platen according to another embodiment of the present invention;
FIG. 4 is a flow chart of a method for testing the permeability of a porous filter material according to an embodiment of the present invention.
Wherein, in fig. 1 to 3:
1-a frame; 2-air pipe; 3-a flow meter; 4-digital micro-pressure meter; 5-fixing part, 6-pressing plate; 61-a plate body; 62-a through hole; 6 a-a through hole; 7-controller, 8-operation panel; 9-adjusting valve; 10-a buffer tank; 11-a precision filter; 12-vacuum pump.
Detailed Description
On the premise of the technical problems, the structure and performance of different materials of the porous filtering material are analyzed. Based on the practical engineering application principle, the method and the device continuously improve innovation, take careful research and development thought, and provide a technical scheme capable of solving the technical problems through numerous experimental design and verification.
The technical scheme and the technical effect are continuously described by taking the porous ceramic fiber filter cylinder as an example. Of course, it will be understood by those skilled in the art that the porous filter material described herein may also be other materials.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an apparatus for testing air permeability of a porous filter material according to an embodiment of the present invention.
The invention provides a device for testing the air permeability of a porous filtering material, which comprises a controller 7, a pressure detection part, a flow velocity detection part, a fixing part 5, a vacuum device and an air pipe 2. The above components can be integrally installed on the frame 1, and the frame 1 mainly functions to support the components, and has a structure that is not disclosed, so that understanding and implementation of the technical scheme in the text by a person skilled in the art are not affected.
The inlet of the vacuum device is communicated with one end of the air pipe 2, the vacuum device is a component for extracting air from the air pipe 2 to obtain vacuum negative pressure, specifically, one port of the air pipe 2 is connected with an extraction port of the vacuum device, the vacuum device provides vacuum negative pressure for the inner cavity of the air pipe 2, so that environmental gas penetrates through the tested surface of the tested porous filtering material to enter the air pipe 2, and a gas filtering state is formed.
In one embodiment, the vacuum device includes at least a vacuum pump 12, and may further include one or more of a regulator valve 9, a buffer tank 10, and a precision filter 11 to achieve further benefits, as will be described in detail below.
The fixing part 5 is used for fixing the tested porous filter material at the other end of the air pipe 2, and a flow surface for communicating the inner cavity of the air pipe 2 with the external environment is formed on the tested surface of the tested porous filter material; that is, the external atmosphere can only enter the inner cavity of the duct 2 through the surface to be tested.
The pressure detection component in the invention is used for detecting the pressure difference of gas passing through the tested surface. In a specific embodiment, the pressure detection component comprises a digital micro-pressure meter 4, and the digital micro-pressure meter 4 can realize the measurement of the pressure difference inside and outside the pipe, and has a simple structure and higher measurement precision.
In addition, the digital micro-pressure meter 4 can be arranged inside the air pipe 2 and close to the installation position of the tested porous filter material, so that the measurement precision can be realized as much as possible.
Of course, the pressure detection component can also be in other structural forms as long as the measurement of the pressure inside and outside the pipe can be realized.
The flow velocity detection component is used for detecting the flow velocity parameter of gas passing through the tested surface; the gas flow rate can be obtained by the flow rate parameter detected by the flow rate detection section. The flow rate detection component may be a flow rate meter that directly measures the flow rate of the gas, or may be a flow meter 3 or other component that indirectly calculates the flow rate across the surface to be tested.
The controller 7 of the invention controls the action of the vacuum device according to the flow speed parameters detected by the flow speed detection part so as to enable the flow speed of the air flow passing through the tested surface to be in a preset flow speed range, and judges whether the pressure difference detected by the pressure detection part is in the air permeability requirement range under the working condition of the preset flow speed range.
And under the working condition of a preset flow speed range, if the pressure difference is in a required range, the air permeability of the tested surface of the porous filter material is considered to meet the requirement, otherwise, the air permeability of the tested surface of the porous filter material is considered to not meet the use requirement.
According to the above description, the air permeability testing device for the porous filtering material provided by the invention can reasonably set the shape of the port of the air pipe 2 or the shape of the fixing part 5 according to the shape of the tested surface, so that the external environment air can pass through the tested surface under the vacuum pumping action of the vacuum device, the air speed passing through the tested surface can be maintained in the preset flow speed range by adjusting the working condition of the vacuum device, the pressure difference of the air flow passing through the tested surface is further judged, and whether the air permeability of the tested surface meets the requirement or not is judged according to the pressure difference value.
That is, the testing device herein can quantitatively evaluate the quality of the air permeability of the porous material by the pressure difference formed on both sides of the porous material when the gas passes through the porous material under the same filtering wind speed condition, so as to satisfy the analysis of the local or overall air permeability of the porous material.
The testing device provided by the invention can realize the whole air permeability test of the product formed by the porous filtering material, and also can divide the product into a plurality of parts, and measure the air permeability of each part to realize the air permeability test of different parts of the product. For example, the air permeability test of each section of the filter cartridge can be realized by dividing the porous ceramic fiber filter cartridge into a plurality of sections, so as to evaluate the air permeability of the porous ceramic fiber filter cartridge from the front end to the rear end at different positions; of course, the porous ceramic fiber filter cartridge can be integrally mounted on the air duct 2 to realize the measurement of the air permeability of the filter cartridge.
Referring to fig. 4, fig. 4 is a flow chart of a method for testing the air permeability of a porous filter material according to an embodiment of the invention.
On the basis of the device for testing the air permeability of the porous filtering material, the invention also provides a method for testing the air permeability of the porous filtering material, which specifically comprises the following steps:
s1, mounting the tested surface of the tested porous filter material on one port of the air pipe 2 to form an airflow surface;
s2, starting a vacuum device to enable the inner cavity of the air pipe 2 to form vacuum negative pressure, so that the environmental gas passes through the surface to be tested, then detecting the flow speed parameter of the air passing through the surface to be tested, and simultaneously detecting the pressure difference of the air flow before and after passing through the surface to be tested;
and S3, adjusting the flow velocity of the air flow passing through the tested surface to be within a preset flow velocity range, and judging whether the pressure difference is within the air permeability requirement range under the working condition of the preset flow velocity range.
In a specific embodiment, the flow rate detection component comprises a flow meter 3, the flow meter 3 is arranged inside the air pipe 2 and close to the installation position of the tested porous filtering material; a flow velocity calculation module is prestored in the controller 7, and the flow velocity calculation module calculates the flow velocity of the current working condition passing through the tested surface according to the detection parameters of the flowmeter 3 and the parameters of the flow surface of the tested surface.
The flow meter 3 measures the flow, and then the flow rate is calculated by the flow rate calculation module of the controller 7, so that the flow rate of the air flow passing through the tested material is accurately obtained.
In order to increase the flexibility of use, the testing device may further comprise an operation panel 8 capable of communicating with the controller 7; the setting position of the operation panel 8 can be flexible. The operation panel 8 comprises a parameter input area and a parameter display area, wherein the parameter input area is used for inputting one or more of the size parameter of the tested surface, the preset flow speed range or the shape of the tested surface to the controller 7; wherein the size of the surface to be tested comprises the effective ventilation area of the surface to be tested or the size of the effective ventilation area can be calculated, or the effective ventilation area can be calculated by inputting the shape and the size of the surface to be tested. For example, inputting a circle and a radius, or inputting a rectangle and a side length size may calculate the effective ventilation area.
The parameter display area is used for displaying one or more of the detection parameters of the pressure detection part, the detection parameters of the flow rate detection part, the working parameters of the vacuum device or the flow rate passing through the tested surface under the current working condition according to the instructions of the controller 7.
The operating condition of the vacuum device can be conveniently adjusted by an operator through the parameter display area, and the operating condition parameters of the testing device can be directly obtained, so that the adjustment flexibility is greatly improved.
For the embodiment in which the vacuum device comprises the vacuum pump 12 and the regulating valve 9, the controller 7 can adjust the opening of the regulating valve 9 to make the flow rate passing through the tested surface within a preset flow rate range, without adjusting the vacuum pump 12, and is simple and convenient, and has high adjustment accuracy.
As described above, the buffer tank 10 is provided in the vacuum apparatus, the buffer tank 10 is located downstream of the regulating valve 9, specifically, the buffer tank 10 may be located between the regulating valve 9 and the precision filter 11, and the main function of the buffer tank 10 is to stabilize the system negative pressure, which can improve the stability of the pressure in the air duct 2.
The fine filter 11 arranged between the buffer tank 10 and the inlet of the vacuum pump 12 in the vacuum device can filter out water vapor in the air and dust and debris falling off from the sample, so as to protect the normal operation of the vacuum device.
Also provided is a fixing member 5 for fixing the porous filter material to be tested to the air duct 2.
Specifically, a flange is fixed at the other end of the air pipe 2, the fixing part 5 comprises a threaded rod, a pressing plate 6 and a nut, one end of the threaded rod penetrates through the pressing plate 6 and the flange to be fixedly connected with the nut, the pressing plate and the flange are locked through the threaded rod and the nut, and the tested porous filter material is tightly pressed between the pressing plate 6 and the flange; and the cross section of the inner hole of the flange has the same size as that of the end of the air pipe 2.
In the above embodiment, the pressing plate 6, the threaded rod and the nut may form an assembly, and the assembly is directly mounted at the port of the air pipe 2 during use, and has a simple structure.
Aiming at the existing commonly used cylindrical porous ceramic fiber filter cylinder and a flat filter plate, two pressing plate 6 structures with different structures are provided, and the structure is as follows.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a pressing plate 6 according to an embodiment of the present invention.
In one embodiment, when the porous filter material to be tested is a cylindrical tube and the surface to be tested is annular, the pressing plate 6 is a plate body 61, when the porous filter material to be tested is installed, the pressing plate 6 closes one end opening of the cylindrical tube, and the edge of the pressing plate 6 is provided with a through hole 6a for installing a threaded rod.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a pressing plate 6 according to another embodiment of the present invention.
In another embodiment, when the porous filter material being tested is a flat sheet, the surface being tested is a flat surface; the pressing plate 6 is a plate body 61 with a through hole 62 formed in the middle, and the size of the through hole 62 is equal to that of the surface to be tested. In fig. 3, a circular test surface is shown, and the through hole 62 in the pressure plate 6 is a circular hole. The edge of the pressure plate 6 is likewise provided with a through-hole 6a for mounting a threaded rod.
Of course, the shape of the pressing plate 6 can be reasonably set according to the components of the test product, and two specific setting modes are described only for the column casing and the flat plate, and the rest is not described any more.
The present invention provides a device and a method for testing the air permeability of a ceramic fiber porous material. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The air permeability testing device for the porous filtering material is characterized by comprising a controller (7), a pressure detection part, a flow velocity detection part, a fixing part (5), a vacuum device and an air pipe (2);
one end opening of the air pipe (2) is connected with an air extraction opening of the vacuum device, the vacuum device provides vacuum negative pressure for the inner cavity of the air pipe (2), so that environmental gas penetrates through the tested surface of the tested porous filter material to enter the air pipe (2) to form a gas filtering state;
the fixing part (5) is used for fixing the tested porous filter material to the other end of the air pipe (2) and enabling the tested surface of the tested porous filter material to form a through surface communicated with the inner cavity of the air pipe (2) and the external environment;
the pressure detection component is used for detecting the pressure difference of gas passing through the tested surface;
the flow velocity detection component is used for detecting the flow velocity parameter of the gas passing through the tested surface;
the controller (7) controls the action of the vacuum device according to the flow speed parameters detected by the flow speed detection part so that the flow speed of the air flow passing through the tested surface is in a preset flow speed range, and judges whether the pressure difference detected by the pressure detection part is in an air permeability requirement range under the working condition of the preset flow speed range.
2. The porous filter material air permeability test apparatus of claim 1, wherein the pressure detection means comprises a digital micro-manometer (4), and the digital micro-manometer (4) is disposed inside the air duct (2) and near the installation position of the porous filter material to be tested.
3. The porous filter material air permeability testing device of claim 1, wherein the flow rate detecting part comprises a flow meter (3), the flow meter (3) is arranged inside the air pipe (2) and close to the installation position of the tested porous filter material; and a flow velocity calculation module is prestored in the controller (7), and the flow velocity calculation module calculates the flow velocity of the current working condition passing through the tested surface according to the detection parameters of the flowmeter (3) and the parameters of the flow surface of the tested surface.
4. The porous filter material air permeability test apparatus of claim 1, further comprising an operation panel (8) for communicating with the controller (7); the operation panel (8) comprises a parameter input area and a parameter display area, wherein the parameter input area is used for inputting one or more of the size parameter of the tested surface, the preset flow speed range or the shape of the tested surface to the controller (7); the parameter display area is used for displaying one or more of the detection parameters of the pressure detection component, the detection parameters of the flow rate detection component, the working parameters of the vacuum device or the flow rate passing through the tested surface under the current working condition according to the instruction of the controller (7).
5. The porous filter material air permeability test apparatus of claim 1, wherein the vacuum means comprises a vacuum pump (12) and a regulating valve (9), and the controller (7) adjusts the opening degree of the regulating valve (9) so that the flow rate passing through the surface to be tested is within a preset flow rate range.
6. The porous filter material air permeability test apparatus of claim 5, wherein the vacuum means comprises a buffer tank (10), the buffer tank (10) being disposed downstream of the regulating valve (9).
7. The apparatus for testing the permeability of a porous filtering material according to claim 6, wherein the vacuum means further comprises a precision filter (11) disposed between the buffer tank (10) and the inlet of the vacuum pump (12).
8. The air permeability testing device for the porous filtering material as claimed in claim 1, wherein a flange is fixed at the other end of the air pipe (2), the fixing part (5) comprises a threaded rod, a pressing plate (6) and a nut, one end of the threaded rod penetrates through the pressing plate (6) and the flange to be fixedly connected with the nut, and the porous filtering material to be tested is pressed between the pressing plate (6) and the flange under the action of the threaded rod and the nut; and the cross section of the inner hole of the flange is the same as the cross section of the end of the air pipe (2).
9. The air permeability testing device for the porous filtering material as claimed in claim 8, wherein when the tested porous filtering material is a cylinder and the tested surface is a ring, the pressing plate (6) is a plate body, when being installed, the pressing plate (6) closes one end opening of the cylinder, and the edge of the pressing plate (6) is provided with a through hole for installing the threaded rod;
or,
when the porous filter material to be tested is a flat plate, the surface to be tested is a plane; the pressing plate (6) is a plate body with a through hole in the middle, and the size of the through hole is equal to that of the tested surface.
10. A method for testing the air permeability of a porous filtering material is characterized by specifically comprising the following steps:
mounting the tested surface of the tested porous filter material on one port of the air pipe to form an airflow surface;
starting a vacuum device to enable the inner cavity of the air pipe to form negative pressure, so that the environmental gas passes through the surface to be tested, then detecting the flow speed parameter of the air passing through the surface to be tested, and simultaneously detecting the pressure difference of the air flow before and after the air flow passes through the surface to be tested;
and adjusting the flow velocity of the air flow passing through the tested surface within a preset flow velocity range, and judging whether the pressure difference is within the air permeability requirement range under the working condition of the preset flow velocity range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010059968.7A CN111220524A (en) | 2020-01-19 | 2020-01-19 | Air permeability testing device and method for porous filtering material |
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| CN111896443A (en) * | 2020-06-29 | 2020-11-06 | 安徽世倾环保科技有限公司 | Composite filter material air permeability detection device and detection method thereof |
| CN112509963A (en) * | 2020-10-30 | 2021-03-16 | 郑州磨料磨具磨削研究所有限公司 | Self-cleaning detection device and detection method for porous vacuum chuck |
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