Aerosol photometer

Abstract

The utility model relates to an aerosol photometer and relates to the technical field of filter detection devices.The aerosol photometer comprises a sampling head, a photometer body and a first filter, the photometer body comprises a shell, an analysis control assembly, a detection light path and an air exhaust assembly, the sampling head, the detection light path and the air exhaust assembly are sequentially communicated, and the first filter is arranged in the shell; the first filter can also be communicated with the detection light path, and communication between the detection light path and the sampling head and communication between the detection light path and the second filter are controlled through an electromagnetic valve. By arranging the aerosol photometer capable of performing zero calibration operation, the influence of current and voltage changes of the instrument on detection during detection is effectively eliminated, and the accuracy of a detection result is ensured.

Description

Technical Field

[0001] The present application relates to the field of filter detection devices, and in particular to an aerosol photometer. Background Art

[0002] High-efficiency filters need to be tested for filtration efficiency both before leaving the factory and when installed. Leak detection of high-efficiency filters refers to on-site leak detection of high-efficiency filters and their systems after installation. It mainly checks for small pinholes in the filter material and its damage, such as frame seals, gasket seals, and leaks on the filter frame. The purpose of leak detection is to check the sealing of the high-efficiency filter and its connection with the installation frame, so as to promptly discover defects in the high-efficiency filter itself and its installation, take appropriate remedial measures, and ensure the cleanliness of the area.

[0003] Existing methods for leak detection of HEPA filters mainly include aerosol photometer testing and counter testing. The aerosol photometer method is simpler to operate and more efficient than the counter method. However, existing aerosol photometers lack a zero-point calibration function, which does not eliminate the influence of current and voltage changes on the test results during testing. This can lead to inaccurate test results and needs improvement. Utility Model Content

[0004] In view of the above problems, the present application is proposed to provide an aerosol photometer that overcomes the above problems or at least partially solves the above problems.

[0005] The aerosol photometer provided in this application adopts the following technical solution:

[0006] An aerosol photometer includes a sampling head and a photometer body, the photometer body including a housing, an analysis and control component, a detection optical path, and an air extraction component, the sampling head, the detection optical path, and the air extraction component being sequentially connected, and further including a first filter, the first filter being connected to the detection optical path, and the connection between the detection optical path and the sampling head is controlled by a solenoid valve;

[0007] An air inlet is provided on the shell, and the air inlet includes an upstream interface and a downstream interface. A first solenoid valve is provided between the upstream interface and the detection light path, a second solenoid valve is provided between the downstream interface and the detection light path, and a third solenoid valve is provided in communication with the inlet end of the first filter.

[0008] Optionally, a four-way connector is further included, and the first solenoid valve, the second solenoid valve, the first filter and the detection optical path are all connected to the four-way connector.

[0009] Optionally, the exhaust component is a fan or an exhaust pump.

[0010] Optionally, the air outlet end of the air extraction component is connected to a second filter.

[0011] Optionally, a flow meter is provided between the second filter and the air extraction component.

[0012] In summary, the present application includes the following beneficial technical effects: By providing an aerosol photometer capable of performing zero-point calibration operations, the present application effectively eliminates the influence of the current and voltage changes of the instrument itself during detection, thereby ensuring the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0014] Figure 2 It is a schematic diagram of the interior of the photometer body in the embodiment of the present application.

[0015] Explanation of the accompanying drawings: 1. Sampling head; 11. Display and operation component; 2. Photometer body; 21. Housing; 211. Air inlet; 2111. Upstream interface; 2112. Downstream interface; 22. Detection optical path; 23. First filter; 24. Second filter; 25. Exhaust component; 3. First solenoid valve; 4. Second solenoid valve; 5. Third solenoid valve; 6. Four-way connector; 7. Flow meter. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Unless otherwise defined, technical or scientific terms used in the present invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0018] This embodiment provides an aerosol photometer.

[0019] Reference Figure 1 、 Figure 2 An aerosol photometer includes a sampling head 1 and a photometer body 2. The sampling head 1 is provided with a display and operation component 11. The photometer body 2 includes a housing 21, an analysis and control component, a detection optical path 22 (which is a mature technology and its principle and structure are not described in detail in this application), a first filter 23, a second filter 24, and an exhaust component 25. The analysis and control component is electrically connected to the display and operation component 11 and the detection optical path 22.

[0020] Reference Figure 2 The housing 21 is provided with an air inlet 211, which includes an upstream interface 2111 and a downstream interface 2112. Both the upstream interface 2111 and the downstream interface 2112 can be quickly connected to the sampling head 1. The upstream interface 2111 and the downstream interface 2112 are connected to the inlet end of the detection optical path 22 through the first solenoid valve 3 and the second solenoid valve 4, respectively. The outlet end of the detection optical path 22 is connected to the inlet end of the second filter 24, and the outlet end of the second filter 24 is connected to the exhaust component 25 to filter the discharged aerosol and prevent it from polluting the environment. The housing 21 is also provided with an air outlet connected to the exhaust component 25.

[0021] The air inlet end of the first filter 23 is connected to a third solenoid valve 5, and the air outlet end of the first filter 23 is connected to the air inlet end of the detection light path 22. In order to realize the connection control of the upstream interface 2111, the downstream interface 2112 and the second filter 24 with the detection light path 22, a four-way connector 6 is also provided in the shell 21, and the outlet end of the first solenoid valve 3, the outlet end of the second solenoid valve 4, the outlet end of the second filter 24 and the inlet end of the detection light path 22 are respectively connected to the four-way connector 6.

[0022] When performing the test, first perform zero point calibration, that is, close the first solenoid valve 3 and the second solenoid valve 4, open the third solenoid valve 5, start the air extraction component 25, and the ambient gas flows through the third solenoid valve 5, the first filter 23, the detection optical path 22, the air extraction component 25, and the exhaust port in sequence. At this time, the staff adjusts the display data of the display operation component 11 according to the display data, and adjusts the display data in this state to 0;

[0023] Then, the sampling head 1 is plugged into the upstream interface 2111, the first solenoid valve 3 is opened, the second solenoid valve 4 and the third solenoid valve 5 are closed, and the sampling head 1 is then placed upstream of the HEPA filter. The exhaust assembly 25 is activated. At this time, the aerosol before passing through the HEPA filter flows sequentially through the sampling head 1, the upstream interface 2111, the first solenoid valve 3, the detection optical path 22, the second filter 24, the exhaust assembly 25, and the exhaust port. The detection optical path 22 measures the mass concentration of the aerosol upstream of the HEPA filter and displays it on the display and operation assembly 11.

[0024] Close the first solenoid valve 3 and the second solenoid valve 4 again, open and close the third solenoid valve 5, and start the air extraction component 25. The aerosol in the environment flows through the third solenoid valve 5, the first filter 23, the detection optical path 22, the air extraction component 25, and the exhaust port in sequence, cleaning the interior of the photometer;

[0025] Finally, the sampling head 1 is connected to the downstream interface 2112. At this time, the second solenoid valve 4 is opened, the first solenoid valve 3 and the third solenoid valve 5 are closed, and the sampling head 1 is placed downstream of the high-efficiency filter. At this time, the aerosol processed by the high-efficiency filter flows through the sampling head 1, the second solenoid valve 4, the detection optical path 22, the second filter 24, the exhaust component 25, and the exhaust port in sequence. The detection optical path 22 tests the aerosol mass concentration upstream of the high-efficiency filter and displays it on the display operation component 11. At this time, by comparing the mass concentration ratio of the aerosol measured upstream and downstream of the high-efficiency filter, the filtering effect of the tested high-efficiency filter can be obtained.

[0026] Reference Figure 2 In order to observe whether the aerosol flow rate is the same during the detection process, a flow meter 7 is further provided between the first filter 23 and the air extraction component 25 .

[0027] The air extraction component 25 can be configured as a fan or an air extraction pump, and in this embodiment, a fan is preferably configured.

[0028] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An aerosol photometer, comprising a sampling head (1) and a photometer body (2), wherein the photometer body (2) comprises a housing (21), an analysis and control component, a detection optical path (22), and an air extraction component (25), wherein the sampling head (1), the detection optical path (22), and the air extraction component (25) are sequentially connected, and characterized in that: It also includes a first filter (23), the first filter (23) is connected to the detection light path (22), and the communication between the detection light path (22) and the sampling head (1) is controlled by a solenoid valve; The housing (21) is provided with an air inlet (211), the air inlet (211) comprising an upstream interface (2111) and a downstream interface (2112), a first solenoid valve (3) being provided between the upstream interface (2111) and the detection optical path (22), a second solenoid valve (4) being provided between the downstream interface (2112) and the detection optical path (22), and a third solenoid valve (5) being provided in communication with the inlet end of the first filter (23).

2. An aerosol photometer according to claim 1, characterized in that: It also includes a four-way connector (6), and the first solenoid valve (3), the second solenoid valve (4), the first filter (23) and the detection optical path (22) are all connected to the four-way connector (6).

3. An aerosol photometer according to claim 1, characterized in that: The air extraction component (25) is a fan or an air extraction pump.

4. An aerosol photometer according to claim 1 or 3, characterized in that: The air outlet end of the air extraction component (25) is connected to a second filter (24).

5. An aerosol photometer according to claim 4, characterized in that: A flow meter (7) is provided between the second filter (24) and the air extraction assembly (25).

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