CN117367680A - Leakage measuring device of cylindrical high-efficiency filter - Google Patents
Leakage measuring device of cylindrical high-efficiency filter Download PDFInfo
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- CN117367680A CN117367680A CN202311337923.1A CN202311337923A CN117367680A CN 117367680 A CN117367680 A CN 117367680A CN 202311337923 A CN202311337923 A CN 202311337923A CN 117367680 A CN117367680 A CN 117367680A
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- 239000000443 aerosol Substances 0.000 claims abstract description 93
- 238000001514 detection method Methods 0.000 claims abstract description 67
- 239000000523 sample Substances 0.000 claims abstract description 51
- 239000002245 particle Substances 0.000 claims abstract description 33
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims description 24
- 230000006641 stabilisation Effects 0.000 claims description 18
- 238000011105 stabilization Methods 0.000 claims description 18
- 238000012360 testing method Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 3
- 238000004887 air purification Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a leakage measuring device of a cylindrical high-efficiency filter, which comprises an air volume control unit, an aerosol generating unit, a scanning detection unit, a particle acquisition unit and a computer control unit, wherein the air volume control unit is used for controlling the air volume of the cylindrical high-efficiency filter; the air quantity control unit is used for adjusting the air inflow of the whole detection process; the aerosol generating unit is used for providing sample gas required for detection; the scanning detection unit comprises a leakage detection chamber and a scanning probe, an aerosol air inlet is arranged at the upper end of the leakage detection chamber, a section of aerosol stable channel pipe is arranged at the lower port of the aerosol air inlet, and a lifting table is arranged below the aerosol stable channel pipe; the particle acquisition unit is used for detecting the concentration of the aerosol at the upstream and downstream; the computer control unit is used for controlling the movement of the lifting table and the scanning probe and analyzing the detected aerosol concentration. Compared with the traditional detection method, the method improves the detection efficiency and accuracy greatly.
Description
Technical Field
The invention relates to a leakage measuring device of a cylindrical high-efficiency filter, and belongs to the technical field of air purification.
Background
The existing high-efficiency filter leakage measurement method or standard only makes clear regulation and guidance on the conventional flat-plate type high-efficiency filter; for high efficiency filters of special construction, such as cylindrical, very specific test methods are not given in the standard, the EN1822 standard mentions only: "for filters that cannot be scan tested for structural reasons, a smoke plume may be used as a reference test". In the plume test, whether leakage exists or not is determined by visual inspection of a tester, and the test method has certain subjectivity and cannot objectively and accurately reflect the leakage condition of the filter.
The detection method for the cylindrical high-efficiency filter at present comprises the following steps: (1) plume method; (2) An inspector holds the probe to sweep leakage at the air outlet of the filter; (3) Several points on the filter were selected for local efficiency measurements. The results of these test methods are not very accurate and are not tested to exactly meet the standard classification requirements of the filter.
TABLE 1 classification of EPA, HEPA and ULPA filters
The classification of filters in the EN1822 standard specifies both total and local values. The filter can calculate the corresponding level only when the filter satisfies both the total value and the local value in the table above.
Taking H14 grade as an example, the total efficiency is more than or equal to 99.995%, and the local efficiency is more than or equal to 99.975%. According to the requirement, when the leakage test is carried out, each point of the filter is scanned gradually, and the local efficiency of each point is more than or equal to 99.975 percent.
If the detection methods (2) and (3) are adopted, they do not scan each position of the filter for leakage detection, the following situations exist: local efficiency is not up to standard, but the total efficiency is up to standard. This is also not in compliance with EN1822 requirements.
One method for substituting 0.3-0.5 μm efficiency tests for plume observations is mentioned in the ISO19463 standard. For ISO 35 grade filters where vortex flow (W-type or cylindrical) exists for structural reasons, standard test methods can be considered. For a theoretical calculation surface of a preset leak point filter, an ISO 35H filter with a local MPPS efficiency of 99.75% must have a total efficiency of higher than 99.996% for particles with a particle size of 0.3 μm to 0.5 μm.
The total efficiency of the conventional high-efficiency filter is required to be higher than 99.95% in ISO 35H, but the requirement of a special structure such as a cylinder is required to be 99.996% because the local efficiency cannot be completely detected. This requirement is severe and difficult to achieve. In practice, there are few acceptance tests for efficiency assessment by the method at the factory.
Disclosure of Invention
The invention aims to provide a leakage measuring device of a cylindrical efficient filter, which aims to overcome the defects of the existing detection method.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the leakage measuring device of the cylindrical efficient filter comprises an air quantity control unit, an aerosol generating unit, a scanning detection unit, a particle acquisition unit and a computer control unit;
the air quantity control unit is used for adjusting the air inflow of the whole detection process;
the aerosol generating unit is used for providing sample gas required for detection for the scanning detection unit;
the scanning detection unit comprises a leakage detection chamber and a scanning probe, an aerosol air inlet connected with the aerosol generation unit is arranged at the upper end of the leakage detection chamber, a section of aerosol stabilization channel pipe is arranged at the lower port of the aerosol air inlet, a lifting table for placing a cylindrical efficient filter to be detected is arranged below the aerosol stabilization channel pipe, and the scanning probe is installed around the cylindrical efficient filter to be detected in a lifting manner;
the particle acquisition unit is used for detecting the concentration of the aerosol at the upstream and downstream;
the computer control unit is used for controlling the movement of the lifting table and the scanning probe, analyzing the detected aerosol concentration and judging whether the filter leaks or not.
Further, the air quantity control unit comprises a frequency modulation fan and a flow regulating valve, and the frequency modulation fan and the flow regulating valve are connected to an outlet end pipeline of the leakage detection chamber.
Further, the aerosol generating unit comprises an aerosol bottle body, a test aerosol substance is arranged at the bottom of the aerosol bottle body, a dust-free air inlet pipe is arranged at one side of the top of the aerosol bottle body, and an aerosol outlet pipe is arranged at the other side of the top of the aerosol bottle body.
Furthermore, the air outlet port of the dust-free air inlet pipe extends downwards and goes deep into the aerosol material to be tested, a nozzle is arranged at the air outlet port, and the air outlet end of the aerosol air outlet pipe is connected with the aerosol air inlet of the leakage detection chamber through a pipeline.
Further, the inner diameter of the aerosol stabilization channel pipe is consistent with the inner diameter of the cylindrical high-efficiency filter to be tested, a sealing ring is arranged at the lower port of the aerosol stabilization channel pipe, and the lifting table drives the cylindrical high-efficiency filter to be tested to move upwards until the air inlet at the upper end of the cylindrical high-efficiency filter to be tested and the lower port of the aerosol stabilization channel pipe are in sealing butt joint.
Further, an air hole is formed in the front end detection surface of the scanning probe, a stainless steel sampling tube is connected to the rear end of the scanning probe, the stainless steel sampling tube is fixed to the lifting mechanism, and meanwhile the stainless steel sampling tube is connected with the particle counter sample inlet through a sampling hose.
Furthermore, the detection surface of the scanning probe is arc-shaped, four scanning probes are arranged in total, and the four scanning probes respectively surround the periphery of the cylindrical high-efficiency filter to be detected during detection.
Furthermore, the whole scanning probe is in a ring shape, and is sleeved around the cylindrical high-efficiency filter to be detected during detection, and a certain gap is reserved between the scanning probe and the cylindrical high-efficiency filter.
Further, the particle collection unit comprises an upstream particle counter and a downstream particle counter, the upstream particle counter is connected with an upstream concentration detection port through a sampling hose, the upstream concentration detection port is arranged on the aerosol stabilization channel tube, and the downstream particle counter is connected with a sampling outlet of the scanning probe through the sampling hose.
Further, the leak detection chamber is provided with a sealing door, a differential pressure sensor and a differential pressure control exhaust valve
The beneficial effects of the invention are as follows:
the invention perfects the evaluating method of the cylinder high-efficiency filter, the size of the scanning probe is set according to the size of the cylinder filter, the scanning probe runs on the track, each point is ensured to be scanned, then the computer judges whether the filter leaks or not by analyzing the feedback result of the particle counter, and the leakage position is recorded in the system.
Compared with the traditional detection method, the invention greatly improves the detection efficiency and accuracy, and fills the blank of the industry in the aspect of cylindrical filter leakage detection.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a scanning detection unit according to the present invention;
FIG. 3 is a schematic view of the aerosol generating unit structure of the present invention;
FIG. 4 is a schematic view of the circular arc scanning probe structure of the present invention;
FIG. 5 is a schematic view of the circular arc scanning probe distribution of the present invention;
fig. 6 is a schematic view of the circular ring scanning probe arrangement of the present invention.
Marked in the figure as: 1-aerosol generator, 101-aerosol bottle, 102-dust-free air inlet pipe, 103-aerosol outlet pipe, 104-nozzle, 105-test aerosol substance, 2-leakage detection chamber, 3-aerosol stable channel pipe, 4-aerosol air inlet, 5-upstream concentration detection port, 6-scanning probe, 7-elevating platform, 8-cylinder high-efficiency filter to be tested, 9-stainless steel sampling pipe, 10-exhaust valve, 11-upstream particle counter, 12-downstream particle counter, 13-frequency modulation fan, 14-flow regulating valve, 15-sampling hose.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
As shown in fig. 1, a leakage measuring device of a cylindrical high-efficiency filter comprises an air volume control unit, an aerosol generating unit, a scanning detection unit, a particle acquisition unit and a computer control unit.
As shown in fig. 2, the scanning detection unit comprises a leak detection chamber 2 and a scanning probe 6, wherein the upper end of the leak detection chamber 2 is provided with an aerosol air inlet 4 connected with the aerosol generation unit, a section of aerosol stabilization channel pipe 3 is arranged at the lower port of the aerosol air inlet 4, a lifting table 7 for placing a cylindrical high-efficiency filter 8 to be detected is arranged below the aerosol stabilization channel pipe 3, and the scanning probe 6 is installed around the cylindrical high-efficiency filter 8 to be detected in a lifting manner; the inner diameter of the aerosol stabilization channel pipe 3 is consistent with the inner diameter of the cylindrical efficient filter 8 to be tested, a sealing ring is arranged at the lower port of the aerosol stabilization channel pipe 3, and the lifting table 7 drives the cylindrical efficient filter 8 to be tested to move upwards until the air inlet at the upper end of the cylindrical efficient filter 8 to be tested is in sealing butt joint with the lower port of the aerosol stabilization channel pipe 3.
As shown in fig. 3, the aerosol generating unit is used for providing the sample gas required for detection to the scanning detection unit; the aerosol generating unit comprises an aerosol bottle body 101, a test aerosol substance 105 is arranged at the bottom of the aerosol bottle body 101, a dust-free air inlet pipe 102 is arranged at one side of the top of the aerosol bottle body 101, and an aerosol outlet pipe 103 is arranged at the other side of the top of the aerosol bottle body 101. The outlet port of the dust-free air inlet pipe 102 extends downwards and goes deep into the test aerosol substance 105, and a nozzle 104 is arranged at the outlet port, and the outlet end of the aerosol outlet pipe 103 is connected with the aerosol inlet 4 of the leakage detection chamber through a pipeline.
The particle acquisition unit is used for detecting the concentration of the aerosol at the upstream and downstream; the particle collection unit comprises an upstream particle counter 11 and a downstream particle counter 12, wherein the upstream particle counter 11 is connected with an upstream concentration detection port 5 through a sampling hose, the upstream concentration detection port 5 is arranged on the aerosol stabilization channel tube 3, and the downstream particle counter 12 is connected with a sampling outlet of the scanning probe 6 through the sampling hose.
As shown in fig. 4, the front end detection surface of the scanning probe 6 is provided with an air hole, the rear end is connected with a stainless steel sampling tube 9, the stainless steel sampling tube 9 is fixed on a lifting mechanism (the lifting mechanism adopts the existing track, lifting sliding block and the like at present), and meanwhile, the stainless steel sampling tube 9 is connected with the sample inlet of the downstream particle counter 12 through a sampling hose 15.
As shown in fig. 5, as one form of the scanning probe of the present embodiment, the detection surface of the scanning probe 6 is circular arc, and four scanning probes 6 are provided, and the four scanning probes 6 respectively surround the periphery of the cylindrical high-efficiency filter 8 to be detected during detection.
As shown in fig. 6, as another form of the scanning probe of this embodiment, the whole scanning probe 6 is in a ring shape, and is sleeved around the cylindrical high-efficiency filter 8 to be tested during detection, and a certain gap is left between the two.
In this embodiment, the air volume control unit is used for adjusting the air intake of the whole detection process, and includes a frequency modulation fan 13 and a flow regulating valve 14, where the frequency modulation fan 13 and the flow regulating valve 14 are connected to an outlet end pipeline of the leak detection chamber 2, and the air volume is controlled by adjusting the opening of the valve.
In this embodiment, the computer control unit is used to control the movement of the lifting table 7 and the scanning probe 6 and to analyze the detected aerosol concentration and determine if the filter is leaking.
In this embodiment, the leak detection chamber 2 is provided with a differential pressure sensor and an exhaust valve 10, and when the pressure is higher than Δp, the valve is opened and when the pressure is reduced to Δp, the valve is closed, and the micro positive pressure is maintained in the detection chamber.
The working process of the leakage measuring device comprises the following steps: firstly, a sealing door on a detection chamber is opened, a cylindrical efficient filter to be detected is placed on a lifting table in a leakage detection chamber, then the lifting table is started to lift upwards until an air inlet at the upper end of the cylindrical efficient filter to be detected is in sealing butt joint with a lower port of an aerosol stabilizing channel pipe, then the sealing door is closed to open a frequency modulation fan and a flow regulating valve, so that aerosol enters the aerosol stabilizing channel pipe through the air inlet of the aerosol, the inner diameter of the aerosol stabilizing channel pipe is consistent with the inner diameter of the cylindrical filter, the flow rate of the aerosol can be uniform and stable when the aerosol enters the filter to be detected, and an upstream particle counter in the aerosol stabilizing channel pipe can detect the concentration of upstream particles. Meanwhile, the scanning probe moves up and down to scan the periphery of the filter, if the cylindrical high-efficiency filter to be tested has leakage, leaked aerosol enters a sampling pipeline through the probe and then enters a downstream particle counter for counting. Finally, the computer analyzes the feedback result of the particle counter, and judges that the leakage is detected if the detected efficiency is lower than the standard specified value, and records the leakage position in the system.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It should be understood by those skilled in the art that the above embodiments do not limit the scope of the present invention in any way, and all technical solutions obtained by equivalent substitution and the like fall within the scope of the present invention. The invention is not related in part to the same as or can be practiced with the prior art.
Claims (10)
1. The leakage measuring device of the cylindrical efficient filter is characterized by comprising an air quantity control unit, an aerosol generating unit, a scanning detection unit, a particle acquisition unit and a computer control unit;
the air quantity control unit is used for adjusting the air inflow of the whole detection process;
the aerosol generating unit is used for providing sample gas required for detection for the scanning detection unit;
the scanning detection unit comprises a leakage detection chamber and a scanning probe, an aerosol air inlet connected with the aerosol generation unit is arranged at the upper end of the leakage detection chamber, a section of aerosol stabilization channel pipe is arranged at the lower port of the aerosol air inlet, a lifting table for placing a cylindrical efficient filter to be detected is arranged below the aerosol stabilization channel pipe, and the scanning probe is installed around the cylindrical efficient filter to be detected in a lifting manner;
the particle acquisition unit is used for detecting the concentration of the aerosol at the upstream and downstream;
the computer control unit is used for controlling the movement of the lifting table and the scanning probe, analyzing the detected aerosol concentration and judging whether the filter leaks or not.
2. The leakage measurement device of the cylindrical high-efficiency filter according to claim 1, wherein the air quantity control unit comprises a frequency modulation fan and a flow regulating valve, and the frequency modulation fan and the flow regulating valve are connected to an outlet end pipeline of the leakage detection chamber.
3. The leakage measurement device of the cylindrical efficient filter according to claim 1, wherein the aerosol generating unit comprises an aerosol bottle body, a test aerosol substance is arranged at the bottom of the aerosol bottle body, a dust-free air inlet pipe is arranged at one side of the top of the aerosol bottle body, and an aerosol outlet pipe is arranged at the other side of the top of the aerosol bottle body.
4. A leakage testing apparatus according to claim 3, wherein the outlet port of said dust-free air inlet tube extends downwardly and into the test aerosol substance and is provided with a nozzle, and the outlet end of said aerosol outlet tube is connected to the aerosol inlet of said leakage detection chamber by a pipe.
5. The leakage measuring device of the cylindrical efficient filter according to claim 1, wherein the inner diameter of the aerosol stabilization channel pipe is identical to the inner diameter of the cylindrical efficient filter to be measured, a sealing ring is arranged at the lower port of the aerosol stabilization channel pipe, and the lifting table drives the cylindrical efficient filter to be measured to move upwards until the air inlet at the upper end of the cylindrical efficient filter to be measured is in sealing butt joint with the lower port of the aerosol stabilization channel pipe.
6. The leakage measuring device of the cylindrical efficient filter according to claim 1, wherein an air hole is formed in a detection surface at the front end of the scanning probe, a stainless steel sampling tube is connected to the rear end of the scanning probe, the stainless steel sampling tube is fixed to the lifting mechanism, and meanwhile the stainless steel sampling tube is connected with a sample inlet of the particle counter through a sampling hose.
7. The leakage measuring device of the cylindrical high-efficiency filter according to claim 1 or 6, wherein the detection surfaces of the scanning probes are arc-shaped, four scanning probes are arranged in total, and the four scanning probes respectively surround the periphery of the cylindrical high-efficiency filter to be measured during detection.
8. The leakage measuring device for the cylindrical high-efficiency filter according to claim 1 or 6, wherein the whole scanning probe is in a circular ring shape, and is sleeved around the cylindrical high-efficiency filter to be measured during detection, and a certain gap is reserved between the scanning probe and the circular ring shape.
9. The leakage measurement device of a cylindrical high efficiency filter according to claim 1, wherein the particle collection unit comprises an upstream particle counter connected to an upstream concentration detection port provided on the aerosol stabilization channel tube through a sampling hose, and a downstream particle counter connected to a sampling outlet of the scanning probe through a sampling hose.
10. The leak testing apparatus of claim 1, wherein the leak testing chamber is provided with a sealing door, a differential pressure sensor, and a differential pressure control vent valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311337923.1A CN117367680A (en) | 2023-10-17 | 2023-10-17 | Leakage measuring device of cylindrical high-efficiency filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311337923.1A CN117367680A (en) | 2023-10-17 | 2023-10-17 | Leakage measuring device of cylindrical high-efficiency filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117367680A true CN117367680A (en) | 2024-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311337923.1A Pending CN117367680A (en) | 2023-10-17 | 2023-10-17 | Leakage measuring device of cylindrical high-efficiency filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117367680A (en) |
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2023
- 2023-10-17 CN CN202311337923.1A patent/CN117367680A/en active Pending
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