Gasoline dilution device and filtration efficiency detection equipment
By designing an aerosol dilution device that includes a filter canister, needle valve, and flow meter, the problem of unstable dilution ratio in traditional devices is solved, achieving stability and accuracy in high-concentration aerosol detection, and making it suitable for filtration efficiency testing equipment.
Patent Information
- Application Number
- CN202521876397.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-01
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-01
AI Technical Summary
Traditional aerosol dilution devices are prone to unstable dilution ratios during use, affecting the accuracy of filtration efficiency detection, especially when detecting high concentrations of aerosols, where the counter is prone to malfunction.
An aerosol dilution device was designed, comprising an aerosol inlet, a filter canister, a needle valve, a flow meter, and a flow restrictor. The filter canister removes most aerosol particles, and the needle valve and flow meter are used to adjust the clean air flow rate to ensure the correct mixing ratio of aerosol and clean air. A signal acquisition device monitors the flow meter signal to achieve a stable dilution ratio.
This technology achieves stability of the dilution ratio in high-concentration aerosol detection, ensures the accuracy of filtration efficiency detection, reduces errors in the counter and photometer, and improves the reliability of the detection equipment.
Smart Images
Figure CN224681915U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to an aerosol dilution device and a filtration efficiency testing device having an aerosol dilution device. Background Technology
[0002] Filtration efficiency testing equipment can be used to test filtration products such as masks and filters. When testing the filtration efficiency of high-efficiency and ultra-high-efficiency filtration products, high-concentration aerosols must be used. However, for particle counters, an aerosol dilution device is required to sample high-concentration aerosols; otherwise, the counter will malfunction due to excessive aerosol concentration.
[0003] Furthermore, traditional aerosol dilution devices are prone to airflow instability when used for extended periods or when aerosol deposits in the pipeline, potentially leading to incorrect dilution ratios and measurement errors. In traditional aerosol dilution device architectures, the flow rate at the dilution filter can vary with the number of uses and time, causing differences in the dilution ratio. This means the dilution ratio may change with the number of uses and time, negatively impacting measurement stability. Utility Model Content
[0004] According to some embodiments disclosed herein, an aerosol dilution device includes an aerosol input component, at least one filter canister, a needle valve, a flow meter, a flow restrictor, and an aerosol output component. The aerosol input component has a communicating inlet, a first outlet, and a second outlet, the inlet being configured to receive aerosol. The filter canister is connected to the first outlet of the aerosol input component and is configured to filter the aerosol. The needle valve is connected to the filter canister and located downstream of the filter canister. The flow meter is connected to the needle valve. The flow restrictor is connected to the second outlet of the aerosol input component. The aerosol output component is located downstream of the flow restrictor and the flow meter, and has a communicating first inlet, a second inlet, and an outlet. The first inlet of the aerosol output component is connected to the flow meter, and the second inlet of the aerosol output component is connected to the flow restrictor.
[0005] In some embodiments, the above-mentioned aerosol dilution device includes two filter tanks connected in parallel.
[0006] In some embodiments, the flow meter is located downstream of the needle valve and upstream of the aerosol output component.
[0007] In some embodiments, the above-described aerosol dilution device further includes a signal acquisition device. The signal acquisition device is electrically connected to a flow meter.
[0008] In some embodiments, the above-described aerosol dilution device further includes a housing. The housing houses the aerosol input, filter canister, needle valve, flow meter, flow restrictor, aerosol output, and signal acquisition device.
[0009] In some embodiments, the needle valve extends outside the housing.
[0010] In some embodiments, the signal acquisition device described above is exposed from the housing.
[0011] According to some embodiments disclosed herein, a filtration efficiency testing device includes a gas flow channel and an aerosol dilution device. The gas flow channel is configured to provide aerosol to the filter media to be tested within the gas flow channel. The aerosol dilution device is connected to the gas flow channel upstream of the filter media to be tested and includes an aerosol input, at least one filter canister, a needle valve, a flow meter, a flow restrictor, and an aerosol output. The aerosol input has a communicating inlet, a first outlet, and a second outlet, the inlet being configured to receive aerosol. The filter canister is connected to the first outlet of the aerosol input and configured to filter the aerosol. The needle valve is connected to the filter canister and located downstream of the filter canister. The flow meter is connected to the needle valve. The flow restrictor is connected to the second outlet of the aerosol input. The aerosol output is located downstream of the flow restrictor and the flow meter and has a communicating first inlet, a second inlet, and an outlet. The first inlet of the aerosol output is connected to the flow meter, and the second inlet of the aerosol output is connected to the flow restrictor.
[0012] In some embodiments, the filtration efficiency testing device further includes a counter. The counter is connected to the outlet of the aerosol output component of the aerosol dilution device.
[0013] In some embodiments, the filtration efficiency testing device further includes a photometer. The photometer is connected to the outlet of the aerosol output component of the aerosol dilution device.
[0014] In the embodiments disclosed above, since the aerosol dilution device includes a filter tank, a needle valve, and a flow meter, with the needle valve located downstream of the filter tank and the flow meter connected to the needle valve, the flow rate of clean air in the pipeline can be adjusted using the needle valve and the flow meter. Furthermore, the signal output of the flow meter can be monitored to ensure the correct mixing ratio of clean air and aerosol. In other words, the aerosol dilution device has the function of adjusting the flow rate and the aerosol concentration dilution ratio, making it suitable for filtration efficiency testing equipment that cannot accept high concentrations of aerosol. Attached Figure Description
[0015] When accompanied by Figure 1 When reading this document, the best understanding of its contents can be obtained from the embodiments described below. Note that, according to standard industry practice, the various features are not drawn to scale. In fact, the dimensions of the various features may be increased or decreased arbitrarily for clarity of explanation.
[0016] Figure 1 A perspective view of an aerosol dilution apparatus according to an embodiment of the present disclosure is shown;
[0017] Figure 2 Draw Figure 1 A schematic diagram of the component configuration of an aerosol dilution device;
[0018] Figure 3 A schematic diagram illustrating the component configuration of an aerosol dilution apparatus according to another embodiment of this disclosure;
[0019] Figure 4 A schematic diagram illustrating the component configuration of a filtration efficiency testing device according to an embodiment of the present disclosure is shown.
[0020] Figure 5 A schematic diagram illustrating the component configuration of a filtration efficiency testing device according to another embodiment of this disclosure is shown.
[0021] [Symbol Explanation]
[0022] 100,100a: Aerosol dilution device
[0023] 110: Air-filled input component
[0024] 112: Air Inlet
[0025] 114: First air outlet
[0026] 116: Second air outlet
[0027] 120, 120a: Filter tank
[0028] 130: Needle valve
[0029] 140: Flow meter
[0030] 150: Flow restrictor
[0031] 160: Air Explosion Component
[0032] 162: First air inlet
[0033] 164: Second air inlet
[0034] 166: Air vent
[0035] 170: Signal Acquisition Device
[0036] 180: Casing
[0037] 182: Handle
[0038] 184: Power switch
[0039] 191, 192, 193, 194, 195: Connectors
[0040] 200, 200a: Filtration efficiency testing equipment
[0041] 202: Supply Chain
[0042] 210: Flow channel
[0043] 220: Filter material to be tested
[0044] 230: Counter
[0045] 240: Photometer
[0046] A, A1, A2, A3: Aerogels
[0047] F,F1: Aerosol Detailed Implementation
[0048] The following description of embodiments provides many different implementations, or examples, for carrying out various features of the provided object. Specific examples of elements and arrangements are described below to simplify the subject matter. Of course, these examples are merely illustrative and are not intended to be limiting. Furthermore, element symbols and / or letters may be repeated in various examples. This repetition is for simplicity and clarity and does not in itself specify the relationship between the various embodiments and / or configurations discussed.
[0049] Spatial relative terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for descriptive purposes to describe the relationship between one element or feature and another, as shown in the accompanying drawings. Spatial relative terms are intended to cover different orientations of the apparatus in use or operation other than those shown in the accompanying drawings. The apparatus may be oriented in other ways (rotated 90 degrees or otherwise), and the spatial relative descriptors used herein shall be interpreted accordingly.
[0050] Figure 1 A perspective view of an aerosol dilution apparatus 100 according to an embodiment of the present disclosure is shown. Figure 2 Draw Figure 1 A schematic diagram of the component configuration of the aerosol dilution device 100. See also... Figure 1 and Figure 2 The aerosol dilution device 100 includes an aerosol input 110, at least one filter canister 120, a needle valve 130, a flow meter 140, a flow restrictor 150, an aerosol output 160, a signal acquisition device 170, and a housing 180. Figure 1 The housing 180 can accommodate Figure 2 The device includes an aerosol input 110, a filter canister 120, a needle valve 130, a flow meter 140, a flow restrictor 150, an aerosol output 160, and a signal acquisition device 170. The needle valve 130 extends outside the housing 180 for user adjustment. The signal acquisition device 170 protrudes from the housing 180 for user observation of values.
[0051] The air inlet 110 has a communicating air inlet 112, a first air outlet 114, and a second air outlet 116, for example... Figure 2The T-shaped flow channel is used. In use, the inlet 112 of the aerosol input 110 receives aerosol A. The filter canister 120 is connected to the first outlet 114 of the aerosol input 110 and is configured to filter a high concentration of aerosol A. In some embodiments, the filter canister 120 is a high-efficiency filter canister capable of filtering out 99.9% of particles, but this is not intended to limit the present disclosure. The needle valve 130 is connected to the filter canister 120 and is located downstream of the filter canister 120. The flow meter 140 is connected to the needle valve 130. The flow meter 140 is located downstream of the needle valve 130 and upstream of the aerosol output 160.
[0052] The flow-limiting tube 150 connects to the second outlet 116 of the aerosol input 110, which can limit the flow of aerosol A, allowing only a portion of aerosol A1 to pass through. The aerosol output 160 is located downstream of the flow-limiting tube 150 and the flow meter 140, and has a communicating first inlet 162, a second inlet 164, and an outlet 166, for example... Figure 2 The flow channel is T-shaped. The first inlet 162 of the aerosol output component 160 is connected to the flow meter 140, and the second inlet 164 is connected to the flow restrictor 150. Thus, the aerosol output component 160 can receive aerosol A1 passing through the flow restrictor 150 and aerosol A2 passing through the filter canister 120, needle valve 130, and flow meter 140. Since most particles of aerosol A can be filtered out by the filter canister 120, the outlet 166 of the aerosol output component 160 can output diluted aerosol A3. Aerosol A3 is a mixture of aerosol A1 and aerosol A2.
[0053] In some embodiments, aerosol A has, for example, 100 particles. 99 particles are filtered out of aerosol A through filter canister 120 to form aerosol A2 (which can be considered clean air). If aerosol A1 after passing through flow restrictor 150 has, for example, only one particle, then aerosol A3 will have only one particle, indicating that aerosol dilution device 100 dilutes the concentration of aerosol A by 100 times. In other words, the high-efficiency filter canister 120 of aerosol dilution device 100 filters most of the input aerosol A and outputs clean airflow (such as aerosol A2), which is then mixed with a small portion of the input aerosol (such as aerosol A1).
[0054] With the above configuration, the aerosol dilution device 100 is an adjustable and monitored aerosol dilution device. Specifically, since the aerosol dilution device 100 has a filter canister 120, a needle valve 130, and a flow meter 140, with the needle valve 130 located downstream of the filter canister 120 and the flow meter 140 connected to the needle valve 130, the flow rate of clean air in the pipeline can be adjusted using the needle valve 130 and the flow meter 140. Furthermore, the signal output of the flow meter 140 can be monitored to ensure the correct mixing ratio of clean air and aerosol. In other words, the aerosol dilution device 100 has the function of adjusting the flow rate and the aerosol concentration dilution ratio, making it suitable for filtration efficiency testing equipment that cannot accept high concentrations of aerosol (to be used in applications where...). Figure 4describe).
[0055] Furthermore, the signal acquisition device 170 is electrically connected to the flow meter 140, and can receive and display the signal from the flow meter 140. The user can adjust the flow rate of aerosol A2 (i.e., clean air) by rotating the needle valve 130 from outside the housing 180, and then adjust the concentration of the output aerosol A3 according to the value displayed by the signal acquisition device 170. In some embodiments, the signal acquisition device 170 is displayed on an electronic watch screen. The aerosol dilution device 100 can monitor the flow rate at the filter canister 120 and can be adjusted via the needle valve 130 to keep the flow rate at the filter canister 120 consistent, so that the aerosol dilution ratio will not change due to the number of uses and time.
[0056] In this embodiment, the housing 180 may further include a handle 182 and a power switch 184. The handle 182 facilitates the user's handling or securing of the aerosol dilution device 100. The power switch 184 can electrically connect the flow meter 140 and the signal acquisition device 170 to provide power. In addition, the aerosol dilution device 100 may include multiple connectors 191, 192, 193, 194, and 195 for connecting various pipelines.
[0057] Figure 3 A schematic diagram illustrating the component configuration of an aerosol dilution apparatus 100a according to another embodiment of this disclosure is shown. The aerosol dilution apparatus 100a includes an aerosol input 110, a filter canister 120, a needle valve 130, a flow meter 140, a flow restrictor 150, and an aerosol output 160. This embodiment and... Figure 2 The difference in implementation lies in that the aerosol dilution device 100a also includes a filter tank 120a, and the two filter tanks 120 and 120a are connected in parallel. This design can enhance the filtration effect on aerosols.
[0058] Tables 1 and 2 below show the experimental data for the initial sampling and the sampling 12 hours after the aerosols have continuously passed through the dilution device. According to Tables 1 and 2, the aerosol dilution device 100a described above is more stable and has less variation than the traditional aerosol dilution device, with a variability (coefficient of variation, CV) of about 1 / 3 that of the traditional aerosol dilution device.
[0059]
[0060] Table 1
[0061]
[0062]
[0063] Table 2
[0064] Table 3 below shows the experimental data for sampling with different particle numbers. According to Table 3, the stability of the dilution ratio of the above-mentioned aerosol dilution device 100a is <5% when the actual number of 0.3μm particles in the dilution sample is between 1,000,000 and 5,000,000.
[0065]
[0066]
[0067] Table 3
[0068] Figure 4 A schematic diagram illustrating the component configuration of a filtration efficiency testing device 200 according to an embodiment of the present disclosure is shown. The filtration efficiency testing device 200 includes a gas flow channel 210 and the aforementioned aerosol dilution device 100. The filter material 220 to be tested is located in the gas flow channel 210, which can supply aerosol F to the filter material 220 through a supply pipe 202. In some embodiments, the filter material 220 to be tested may be an air conditioning filter, an automotive filter, or a PM2.5 mask, but is not limited to the above-mentioned filter materials. The aerosol dilution device 100 is connected to the gas flow channel 210 upstream of the filter material 220 to be tested. A portion of the aerosol F (i.e., aerosol F1) can pass through the filter material 220 to be tested, and the portion of the aerosol F that cannot pass through the filter material 220 to be tested (i.e., aerosol A) can be received by the air inlet 112 of the aerosol dilution device 100. The operating mechanism of the aerosol dilution device 100 diluting aerosol A to form aerosol A3 has been described in [the original text]. Figure 2 The description will not be repeated.
[0069] In addition, the filtration efficiency testing device 200 also includes a counter 230. The counter 230 is connected to the aerosol output component 160 of the aerosol dilution device 100 (see...). Figure 2 The air outlet 166. The counter 230 cannot accept high concentrations of aerosol, but the concentration of aerosol A3 output by the aerosol dilution device 100 has been greatly reduced, so that the counter 230 can successfully detect the number of aerosol A3 particles and thus determine the filtration capacity of the filter material 220 to be tested.
[0070] Figure 5 A schematic diagram illustrating the component configuration of a filtration efficiency testing device 200a according to another embodiment of this disclosure is shown. The filtration efficiency testing device 200a includes a gas flow channel 210 and the aforementioned aerosol dilution device 100. This embodiment and... Figure 4 The difference in implementation is that the filtration efficiency testing device 200a also includes a photometer 240, and has no... Figure 4 The counter 230. The photometer 240 is connected to the aerosol output part 160 of the aerosol dilution device 100 (see...). Figure 2The photometer 240 cannot accept high concentrations of aerosol, but the concentration of aerosol A3 output by the aerosol dilution device 100 has been greatly reduced, allowing the photometer 240 to successfully detect the photometric value of aerosol A3, and thus determine the filtration capacity of the filter material 220 to be tested.
[0071] The foregoing outlines the features of several embodiments to enable those skilled in the art to better understand the nature of this disclosure. Those skilled in the art should understand that they can readily use this disclosure as the basis for designing or modifying other processes and structures to achieve the same purposes and / or advantages as the embodiments described herein. Those skilled in the art should also recognize that such equivalent constructions do not depart from the spirit and scope of this disclosure, and that various changes, substitutions, and modifications can be made to them without departing from the spirit and scope of this disclosure.
Claims
1. An aerogel dilution device, characterized in that, include: An aerosol input device has a communicating air inlet, a first air outlet and a second air outlet, the air inlet being configured to receive an aerosol. At least one filter canister is connected to the first outlet of the aerosol input and configured to filter the aerosol. A needle valve is connected to the filter canister and located downstream of the filter canister; A flow meter is connected to the needle valve; A flow-limiting tube is connected to the second air outlet of the aerosol input component; as well as An air-gel output component is located downstream of the flow restrictor and the flow meter, and has a first air inlet, a second air inlet and an air outlet connected in communication. The first air inlet of the air-gel output component is connected to the flow meter, and the second air inlet of the air-gel output component is connected to the flow restrictor.
2. The aerogel dilution device as described in claim 1, characterized in that, It includes two filter tanks, which are connected in parallel.
3. The aerogel dilution device as described in claim 1, characterized in that, The flow meter is located downstream of the needle valve and upstream of the aerosol output component.
4. The aerogel dilution apparatus as described in claim 1, characterized in that, Also includes: A signal acquisition device is electrically connected to the flow meter.
5. The aerogel dilution apparatus as described in claim 4, characterized in that, Also includes: A housing that houses the aerosol input component, the filter canister, the needle valve, the flow meter, the flow restrictor, the aerosol output component, and the signal acquisition device.
6. The aerogel dilution apparatus as described in claim 5, characterized in that, The needle valve extends outside the housing.
7. The aerogel dilution apparatus as described in claim 5, characterized in that, The signal acquisition device protrudes from the housing.
8. A filtration efficiency testing device, characterized in that, include: A gas flow channel configured to provide an aerosol to a filter material to be tested within the gas flow channel; as well as An aerogel dilution device, connected to the gas flow channel at a position upstream of the filter material to be tested, and comprising: An aerosol input device has a communicating air inlet, a first air outlet and a second air outlet, the air inlet being configured to receive the aerosol. At least one filter canister is connected to the first outlet of the aerosol input and configured to filter the aerosol. A needle valve is connected to the filter canister and located downstream of the filter canister; A flow meter is connected to the needle valve; A flow-limiting tube is connected to the second air outlet of the aerosol input component; and An air-gel output component is located downstream of the flow restrictor and the flow meter, and has a first air inlet, a second air inlet and an air outlet connected in communication. The first air inlet of the air-gel output component is connected to the flow meter, and the second air inlet of the air-gel output component is connected to the flow restrictor.
9. The filtration efficiency testing device as described in claim 8, characterized in that, Also includes: A counter is connected to the outlet of the aerosol output component of the aerosol dilution device.
10. The filtration efficiency testing device as described in claim 8, characterized in that, Also includes: A photometer is connected to the outlet of the aerosol output component of the aerosol dilution device.