Particulate matter filtering efficiency testing device

Abstract

The utility model relates to the technical field of filtering efficiency testing, and discloses a particulate matter filtering efficiency testing device which comprises a rack internally provided with a mounting cavity, a profiling tool jig is arranged at the top of the rack, and a first particle counter, a second particle counter and a generator are arranged in the mounting cavity; the profiling tool jig comprises a base and an upper cover which can be oppositely opened and closed, a first inner cavity and a second inner cavity are formed in the base and the upper cover respectively, an air inlet and a particle port are formed in the outer side of the upper cover, and the base and one end of the upper cover can be mutually embedded; a product is arranged between a base and an upper cover of the profiling tool jig, it is ensured that the product can be tightly pressed through a mutually-embedded structure, and particulate matter is output from a generator, sequentially passes through a first particle counter, a second inner cavity, the product, the first inner cavity and the second particle counter and then is discharged.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration efficiency testing, in particular to a particle filtration efficiency testing device. Background Art

[0002] As people pay more and more attention to air quality, various filtering materials and protective products have emerged. They are widely used in air purification, industrial dust removal, personal protection and other fields.

[0003] How to accurately evaluate the filtration efficiency of these filter materials and products on particulate matter is extremely important; based on this, many filtration efficiency testing devices have appeared on the market; however, in existing testing devices, the fixtures are pressed with flat jigs, which will lead to loose pressing and inaccurate test results; the air flow rate of the intake air pipe is large, and the monitored data is unstable; it is directly connected to the generator that produces particulate matter without buffering, which will reduce the accuracy of the measurement; using single-channel measurement, the data obtained is single; and the existing testing devices are difficult to operate and require a certain level of proficiency for the users. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a particle filtration efficiency testing device, wherein a contoured tooling fixture for clamping a product adopts a base and an upper cover that can be relatively opened and closed, one end of which can be interlocked with each other, which can ensure that the product is pressed tightly and the test result is accurate.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A particle filtration efficiency testing device comprises a frame with an installation cavity inside, a contoured tooling fixture for clamping a product is arranged on the top of the frame, and a first particle counter, a second particle counter and a generator for generating particles are arranged in the installation cavity;

[0007] The profiling tooling fixture comprises a base and an upper cover which can be opened and closed relative to each other, wherein a first inner cavity and a second inner cavity are respectively provided inside the base and the frame, and an air inlet and a particle port which are connected to the second inner cavity are provided on the outer side of the upper cover, and the base and one end of the upper cover can be interlocked with each other;

[0008] The generator, the first particle counter and the particle port are connected in series in sequence, and the first inner cavity is connected to the input end of the second particle counter.

[0009] Optionally, a boss is provided on the upper portion of the base, a groove matching the outer contour of the boss is formed at the lower end of the upper cover, and when the boss is embedded in the groove, the first inner cavity and the second inner cavity are communicated.

[0010] Optionally, a bracket is fixedly mounted on one side of the base, a telescopic component is mounted on the bracket, and an output end of the telescopic component is coaxial with the base and connected to the upper cover.

[0011] Optionally, the bracket adopts an inverted L structure, and the telescopic component adopts a cylinder.

[0012] Optionally, a sealing ring is provided between the base and the upper cover.

[0013] Optionally, two air inlets are provided, two air sources are provided on one side of the frame, and output ends of the two air sources are respectively connected to the two air inlets.

[0014] Optionally, a filter is further provided in the installation cavity, and an output end of the second particle counter is connected to the filter.

[0015] Optionally, a partition for receiving the first particle counter and the second particle counter is further provided in the installation cavity, the partition divides the installation cavity into two upper and lower chambers, and the generator and the filter are arranged in the lower chamber.

[0016] Beneficial Effects

[0017] (1) The product of the utility model is placed between the base and the upper cover of the contoured tooling fixture, and the mutually interlocking structure ensures that it can be tightly pressed. The particles are produced from the generator, and are discharged after passing through the first particle counter, the second inner cavity, the product, the first inner cavity and the second particle counter in sequence. The first particle counter and the second particle counter can respectively record the number of particles before and after passing through the product, thereby achieving the purpose of detecting its filtration efficiency; the structure of the device is rigorous, which can not only ensure the sealing of the product during pressing, but also can respectively count the number of particles through the first and second particle counters, thereby ensuring the accuracy of the test results.

[0018] (2) With respect to the above-mentioned contoured tooling fixture, by providing a sealing ring between the base and the upper cover, the sealing performance of the product press-fitting can be greatly improved.

[0019] (3) In the present invention, the particulate matter flowing out of the second particle counter can be filtered by a filter to ensure that the gas will not affect the external environment when it is discharged.

[0020] (4) In the present invention, two air inlets are provided which are connected to the second inner cavity and are respectively connected to two air sources. The two air paths formed do not interfere with each other, and the filtration efficiency of the product can be tested under different environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the utility model profiling fixture;

[0023] Among them, 1. rack; 2. mounting cavity; 3. generator; 4. first particle counter; 5. second particle counter; 6. contoured tooling fixture; 61. base; 62. upper cover; 63. first inner cavity; 64. boss; 65. second inner cavity; 66. groove; 7. air inlet; 8. particle port; 9. bracket; 10. telescopic assembly; 11. air source; 12. partition; 13. filter; 14. control panel. DETAILED DESCRIPTION

[0024] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0025] Embodiment 1

[0026] like Figure 1 As shown, a particle filtration efficiency testing device includes a frame 1, a generator 3, a first particle counter 4, a second particle counter 5, a profiling tool fixture 6, a filter 13 and a control panel 14, wherein an installation cavity 2 is opened inside the frame 1, the generator 3, the first particle counter 4, the second particle counter 5 and the filter 13 are all arranged in the installation cavity 2, and the output end of the second particle counter 5 is connected to the filter 13; the profiling tool fixture 6 is arranged on the top of the frame 1, and the control panel 14 is arranged on one side of the upper part of the frame 1, which is used to control the overall working state of the device.

[0027] Among them, the generator 3, the first particle counter 4, the profiling tooling fixture 6, the second particle counter 5 and the filter 13 are connected in series in sequence, that is, the particulate matter generated by the generator 3 first passes through the first particle counter 4 to obtain the number before filtering, then enters the profiling tooling fixture 6, passes through the filtering product, and then enters the second particle counter 5 to obtain the number of particulate matter after filtering, and finally enters the filter 13, and the filter 13 filters and intercepts the particulate matter therein, so that the test gas finally discharged by the device will not affect the external environment.

[0028] As mentioned above, a partition 12 for receiving the first particle counter 4 and the second particle counter 5 is also provided in the installation cavity 2. The partition 12 divides the installation cavity 2 into two upper and lower chambers, and the generator 3 and the filter 13 are arranged in the chamber located below; this structure is conducive to the orderly installation of various components in the installation cavity 2, and is convenient for subsequent maintenance work.

[0029] The particles generated by the generator 3 are driven into the contoured tooling fixture 6 by gas, and a buffer filter cavity is placed in front of the generator 3. Compared with the non-buffered structure in the prior art, the measurement accuracy can be improved.

[0030] like Figure 2 As shown, the contoured tooling fixture 6 includes a base 61 and an upper cover 62 which can be opened and closed relative to each other, and a first inner cavity 63 and a second inner cavity 65 are respectively provided inside the base 61 and the upper cover 62, and an air inlet 7 and a particle port 8 which are connected to the second inner cavity 65 are provided on the outer side of the upper cover 62, and one end of the base 61 and the upper cover 62 can be interlocked with each other.

[0031] The base 61 is fixedly connected to the frame 1, and the upper cover 62 can be raised and lowered in the longitudinal direction to facilitate relative opening and closing with the base 61, and the generator 3, the first particle counter 4 and the particle port 8 are connected in series in sequence, and the first inner cavity 63 is connected to the input end of the second particle counter 5.

[0032] A gas source 11 is also provided on one side of the frame 1 , the output end of which is connected to the gas inlet 7 , and the gas source 11 is used to provide gas to the second inner cavity 65 to drive the particles to pass through the product.

[0033] The generator 3 is used to generate particulate matter, which enters the first particle counter 4 along its output end, and the number of particles before filtration is obtained by detection by the first particle counter 4. Then, the particles enter the second inner cavity 65 of the upper cover 62 through the particle port 8. Driven by the gas provided by the gas source 11, the mixture of gas and particulate matter passes through the product clamped between the base 61 and the upper cover 62 and enters the first inner cavity 63 of the base 61. Then, the mixture enters the second particle counter 5, and the number of particles after filtration is obtained by detection by the second particle counter 5. According to the data obtained before and after filtration, the filtration efficiency of the product can be obtained.

[0034] As mentioned above, two air sources 11 are provided on one side of the frame 1, and two air inlets 7 are also provided on the outer side of the upper cover 62, and the output ends of the two air sources 11 are respectively connected to the two air inlets 7; based on this structure, the two air paths formed do not interfere with each other, and the filtration efficiency of the product can be tested under different environments; that is, the two air sources 11 respectively store two test gases, such as oily gas and saline gas, and the two air paths can input gas into the second inner cavity 65 separately or simultaneously as needed to provide different test environments, so that the obtained test data is more real and effective.

[0035] Furthermore, a bracket 9 is fixedly mounted on one side of the base 61 , and a telescopic component 10 is mounted on the bracket 9 . The output end of the telescopic component 10 is coaxial with the base 61 and connected to the upper cover 62 .

[0036] Under the action of the telescopic assembly 10, the upper cover 62 can be raised and lowered in the longitudinal direction; when it rises, the contoured tooling fixture 6 opens, and the staff can take out or put in the product to be tested. When it descends, the contoured tooling fixture 6 closes to press-fit the product therein.

[0037] The bracket 9 adopts an inverted L structure, which can make the structure of the device more compact. The telescopic component 10 adopts a cylinder, which can not only complete the lifting and lowering driving function, but also has a lower cost than the electric cylinder. Compared with the oil cylinder, the device has an air source 11, which makes it more convenient to use the cylinder. In addition, the cylinder body can be installed inside the bracket 9, and only its output end is ensured to extend to the outside, which can not only achieve the purpose of protecting the components, but also simplify the overall structure of the device.

[0038] In addition, the generator 3, the first particle counter 4, the second particle counter 5 and the filter 13 used in the present invention are all prior arts, so their specific structures and working principles are not described in detail here.

[0039] Working principle:

[0040] First, the product to be tested is placed on the upper end of the base 61 of the profiling fixture 6 so that it completely covers the open end of the first inner cavity 63. Then, the telescopic component 10 drives the upper cover 62 to descend until one end of the base 61 is embedded in the upper cover 62. The profiling fixture 6 is closed to complete the press-fitting of the product. Then, the particles generated by the generator 3 enter the first particle counter 4 along its output end, and the number of particles before filtration is obtained by the first particle counter 4. The particles in the first particle counter 4 enter the second inner cavity 65 of the upper cover 62 through the particle port 8. Driven by the gas provided by the gas source 11, the gas The mixture of the gas and the particles passes through the product clamped between the base 61 and the upper cover 62 and enters the first inner cavity 63 of the base 61. The first inner cavity 63 is connected to the second particle counter 5, so the mixture then enters the second particle counter 5. The number of filtered particles is detected by the second particle counter 5. The filtration efficiency of the product can be obtained based on the data obtained before and after filtration. The mixture in the second particle counter 5 will eventually enter the filter 13, and the filter 13 will filter and intercept the particles therein, so that the test gas finally discharged from the device will not affect the external environment.

[0041] Embodiment 2

[0042] like Figure 1-Figure 2 As shown, based on the first embodiment, the present invention further proposes a more specific structure of the profiling tooling fixture 6.

[0043] A boss 64 is provided on the upper part of the base 61, and a groove 66 matching the outer contour of the boss 64 is opened at the lower end of the upper cover 62; when the upper cover 62 descends under the drive of the cylinder, the boss 64 can be embedded in the groove 66, and when the boss 64 is completely embedded in the groove 66, the first inner cavity 63 and the second inner cavity 65 are connected, and the product is located between the first inner cavity 63 and the second inner cavity 65.

[0044] As mentioned above, the upper part of the boss 64 is provided with a conical surface, which not only has a guiding function, but also can increase the contact area between the boss 64 and the side of the groove 66, thereby better achieving sealing, ensuring the tight press-fitting of the product, and ensuring the accuracy of the test results.

[0045] Furthermore, a sealing ring is provided between the base 61 and the upper cover 62. The sealing ring is made of silicone material and is sleeved on the outer side of the boss 64. When the base 61 and the upper cover 62 are aligned, the sealing ring can ensure complete sealing between the two.

[0046] In summary, the contoured tooling fixture 6 adopted in the utility model can be completely sealed to increase the authenticity of the test data; the dual air path fixture can prevent the test air path from being affected by the air supply, ensure the data stability, and can also perform detection work in different environments; the operation steps are reduced, and the current tooling fixture can automatically achieve sealing, air intake, and detection. You only need to put the product into the fixture and click the start button on the control panel 14 to reduce the chance of error; the use of a dual counter structure can increase the accuracy and stability of the test data, and the device can also output data in real time to print the test results.

[0047] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0049] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A particle filtration efficiency testing device, characterized in that: It comprises a frame (1) having an installation cavity (2) therein, a contoured tooling fixture (6) for clamping a product is arranged on the top of the frame (1), and a first particle counter (4), a second particle counter (5) and a generator (3) for generating particulate matter are arranged in the installation cavity (2); The profiling tooling fixture (6) comprises a base (61) and an upper cover (62) which can be opened and closed relative to each other, and a first inner cavity (63) and a second inner cavity (65) are respectively provided inside the base (61) and the frame (1), and an air inlet (7) and a particle port (8) which are in communication with the second inner cavity (65) are provided on the outer side of the upper cover (62), and one end of the base (61) and the upper cover (62) can be interlocked with each other; The generator (3), the first particle counter (4) and the particle port (8) are sequentially connected in series, and the first inner cavity (63) is connected to the input end of the second particle counter (5).

2. The particle filtration efficiency testing device according to claim 1, characterized in that: A boss (64) is provided on the upper portion of the base (61), a groove (66) matching the outer contour of the boss (64) is provided on the lower end of the upper cover (62), and when the boss (64) is embedded in the groove (66), the first inner cavity (63) and the second inner cavity (65) are connected.

3. The particle filtration efficiency testing device according to claim 1, characterized in that: A bracket (9) is fixedly mounted on one side of the base (61), a telescopic assembly (10) is mounted on the bracket (9), and an output end of the telescopic assembly (10) is coaxial with the base (61) and connected to the upper cover (62).

4. The particle filtration efficiency testing device according to claim 3, characterized in that: The bracket (9) adopts an inverted L structure, and the telescopic component (10) adopts a cylinder.

5. The particle filtration efficiency testing device according to claim 1, characterized in that: A sealing ring is provided between the base (61) and the upper cover (62).

6. The particle filtration efficiency testing device according to claim 1, characterized in that: Two air inlets (7) are provided, two air sources (11) are provided on one side of the frame (1), and the output ends of the two air sources (11) are respectively connected to the two air inlets (7).

7. The particle filtration efficiency testing device according to claim 1, characterized in that: A filter (13) is also provided in the installation cavity (2), and the output end of the second particle counter (5) is connected to the filter (13).

8. The particle filtration efficiency testing device according to claim 7, characterized in that: A partition (12) for receiving the first particle counter (4) and the second particle counter (5) is also provided in the installation cavity (2); the partition (12) divides the installation cavity (2) into two upper and lower chambers, and the generator (3) and the filter (13) are arranged in the lower chamber.

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