CN219657442U - Real-time calibrating device for particulate matter filtering efficiency - Google Patents
Real-time calibrating device for particulate matter filtering efficiency Download PDFInfo
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- CN219657442U CN219657442U CN202320381368.1U CN202320381368U CN219657442U CN 219657442 U CN219657442 U CN 219657442U CN 202320381368 U CN202320381368 U CN 202320381368U CN 219657442 U CN219657442 U CN 219657442U
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- 238000001914 filtration Methods 0.000 title claims abstract description 50
- 239000013618 particulate matter Substances 0.000 title claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 97
- 239000000443 aerosol Substances 0.000 claims abstract description 88
- 238000005070 sampling Methods 0.000 claims abstract description 57
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000005259 measurement Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000012552 review Methods 0.000 description 1
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Abstract
The utility model discloses a real-time calibrating device for particulate matter filtering efficiency, which comprises an aerosol generating part, an upper clamp, a lower clamp and an aerosol discharging part, wherein aerosol generated by the aerosol generating module sequentially flows through the upper clamp, a filter material and the lower clamp and is discharged through the aerosol discharging part, an upstream photometer sampling module is connected with the upper clamp and is used for detecting the concentration of the aerosol before flowing through the filter material, a downstream photometer sampling module is connected with the lower clamp and is used for detecting the concentration of the aerosol after flowing through the filter material, a main control board is used for receiving detection data of the upstream photometer sampling module and the downstream photometer sampling module, and a display screen is connected with the main control board and is used for displaying data information received and calculated by the main control board. The gas circuit is calibrated through the two independent photometers on the upstream and the downstream, so that real-time calibration is realized, the calibration efficiency and the accuracy are improved, and the gas circuit is directly connected to the upstream and the downstream clamps of the detection device, so that the device is convenient to install and use.
Description
Technical Field
The utility model relates to the technical field of particulate matter detection, in particular to a real-time calibration device for particulate matter filtering efficiency.
Background
In the field of filter material production and detection of masks, melt-blown fabrics and the like, the filtering efficiency of particulate matters is a vital detection index, for example, most of filtering efficiency detection devices are combined by adopting an aerosol generation module, a detection module, a sampling module and the like, and the filtering efficiency of the filter materials of the masks, the melt-blown fabrics and the like is detected, so that the quality of the masks is evaluated.
The conventional calibration method for the particulate matter filtering efficiency detection device is to find a proper position in an aerosol flow path of the detection device, access a standard aerosol photometer, take filter materials with different filtering efficiencies as test objects, and calibrate the filtering efficiency measurement result in a comparison mode. The calibration device usually adopts a standard aerosol photometer, and a complicated switching valve, a connecting pipeline and the like are required to be designed, so that the switching of an upstream gas circuit and a downstream gas circuit is required during the calibration, the calibration efficiency is low, and the accuracy is low.
The above information disclosed in this background section is only for enhancement of understanding of the background section of the utility model and therefore it may not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems pointed out in the background art, the utility model provides the real-time calibrating device for the particulate matter filtering efficiency, which realizes real-time calibration by an upstream-downstream independent photometer calibration gas circuit, improves the calibration efficiency and the accuracy, and is convenient to install and use because the calibration gas circuit is directly connected to an upstream clamp and a downstream clamp of the detecting device.
In order to achieve the aim of the utility model, the utility model is realized by adopting the following technical scheme:
the utility model provides a real-time calibration device for particulate matter filtering efficiency, which comprises:
the device comprises a filtering efficiency detection module, a filtering device and a filtering device, wherein the filtering efficiency detection module comprises an aerosol generating part, an upper clamp, a lower clamp and an aerosol discharging part, a filter material to be tested is clamped between the upper clamp and the lower clamp, and aerosol generated by the aerosol generating module sequentially flows through the upper clamp, the filter material and the lower clamp and is discharged through the aerosol discharging part;
an upstream photometer sampling module connected with the upper clamp through a pipeline for detecting the concentration of aerosol before flowing through the filter material;
a downstream photometer sampling module connected to the lower jig through a pipe for detecting the concentration of the aerosol after flowing through the filter material;
the main control board is used for receiving detection data of the upstream photometer sampling module and the downstream photometer sampling module;
and the display screen is connected with the main control board and used for displaying the data information received and calculated by the main control board.
In some embodiments of the present utility model, the upstream photometer includes an upstream aerosol inlet, one end of the upstream aerosol inlet is connected to the upper fixture through a pipeline, the other end of the upstream aerosol inlet is connected to an upstream bypass tee, aerosol flowing out of the upstream bypass tee is divided into two paths, one path flows into an upstream photometer sampler, the other path flows into the upstream photometer sampler through an upstream shielding gas filter and an upstream shielding gas orifice flowmeter, and the upstream photometer sampler is connected to the main control board through a pipeline.
In some embodiments of the present utility model, the air outlet end of the upstream photometer sampler is sequentially connected to an upstream filter, an upstream orifice flowmeter and an upstream sampling pump through a pipeline.
In some embodiments of the utility model, an upstream air volume is provided between the upstream orifice flow meter and the upstream sampling pump.
In some embodiments of the present utility model, the downstream photometer includes a downstream aerosol inlet, one end of the downstream aerosol inlet is connected to the lower fixture through a pipeline, the other end of the downstream aerosol inlet is connected to a downstream bypass tee, aerosol flowing out of the downstream bypass tee is divided into two paths, one path flows into a downstream photometer sampler, the other path flows into the downstream photometer sampler through a downstream shielding gas filter and a downstream shielding gas orifice flowmeter, and the downstream photometer sampler is connected to the main control board through a pipeline.
In some embodiments of the present utility model, the outlet end of the downstream photometer sampler is connected to the downstream filter, the downstream orifice flowmeter, and the downstream sampling pump in sequence through a pipeline.
In some embodiments of the utility model, a downstream air volume is provided between the downstream orifice flow meter and the downstream sampling pump.
In some embodiments of the present utility model, the upper fixture is provided with an upstream access port for accessing the upstream photometer sampling module;
and a downstream access port for accessing the downstream photometer sampling module is arranged on the lower clamp.
Compared with the prior art, the utility model has the advantages and positive effects that:
according to the real-time calibration device for the particulate matter filtering efficiency, disclosed by the utility model, the real-time calibration is realized through the two independent photometer calibration gas paths at the upstream and the downstream, and the calibration efficiency and accuracy are improved.
Meanwhile, the calibration gas circuit is directly connected to the upstream and downstream clamps of the detection device, so that the device is convenient to install and use, and the difficulty of disassembly and calibration is reduced.
Other features and advantages of the present utility model will become apparent upon review of the detailed description of the utility model in conjunction with the drawings.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of a real-time particulate matter filtering efficiency calibration device according to an embodiment.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The embodiment discloses a real-time calibration device for particulate matter filtering efficiency, referring to fig. 1, which mainly comprises a filtering efficiency detection module 100, an upstream photometer sampling module 200, a downstream photometer sampling module 300, a main control board 400, a display screen 500 and the like.
The filtering efficiency detection module 100 includes an aerosol generating portion, an upper clamp 105, a lower clamp 106, and an aerosol discharging portion, wherein a filter medium to be tested is sandwiched between the upper clamp 105 and the lower clamp 106, and aerosol generated by the aerosol generating module flows through the upper clamp 105, the filter medium, and the lower clamp 106 in sequence, and is discharged through the aerosol discharging portion.
The upstream photometer sampling module 200 is connected to the upper fixture 105 via a pipe for detecting the concentration of aerosol before flowing through the filter.
The downstream photometer sampling module 300 is connected to the lower fixture 106 via a pipeline for detecting the concentration of aerosol after flowing through the filter.
The main control board 400 is used for receiving detection data of the upstream photometer sampling module 200 and the downstream photometer sampling module 300.
The display screen 500 is connected with the main control board 400, and is used for displaying data information received and calculated by the main control board 400.
Specifically, the aerosol generating module includes a spray head 102, a residual air discharge filter 103, and the like, the aerosol discharge section includes a pump front end filter 107, a pump front end flowmeter 108, and the like,
the filtering efficiency detecting device 100 generates aerosol by the spray head 102 under the action of the compressed clean air 101, the generated aerosol is divided into two paths, one path of aerosol enters the upper clamp 105, and the other path of aerosol is exhausted through the residual air exhausting filter 103.
Aerosol entering the interior cavity of the upper fixture 105 flows partially through the filter and the lower fixture 106, and partially into the upstream photometer sampling module 200 for upstream aerosol concentration detection.
Aerosol entering the inner cavity of the lower clamp 106 enters the downstream photometer sampling module 300 to detect the concentration of the downstream aerosol, and the other part is discharged from the sampling pump 109 after being cleaned by the pump front end filter 107, and the real-time flow of the sampling pump 109 is regulated by the pump front end flowmeter 108.
The real-time aerosol concentration electric signals obtained by the upstream photometer circuit board 206 in the upstream photometer sampling module 200 and the downstream photometer circuit board 306 in the downstream photometer sampling module 300 are transmitted to the main control board 400, real-time data are displayed on the display screen 500, and the main control board 400 performs concentration conversion on the obtained real-time aerosol electric signals of the upstream photometer sampling module 200 and the downstream photometer sampling module 300 by a gravimetric method.
The real-time calibrating device for the particulate matter filtering efficiency realizes real-time calibration by calibrating the gas circuit through the two independent photometers at the upstream and the downstream, and improves the calibrating efficiency and the accuracy.
Meanwhile, the calibration gas circuit is directly connected to the upstream and downstream clamps of the detection device, so that the device is convenient to install and use, and the difficulty of disassembly and calibration is reduced.
In some embodiments of the present utility model, the calibrated real-time calibration device for filtering efficiency can compare and correct the concentration value of the filtering efficiency detecting device 100.
In order to improve consistency of concentration parameters of the upstream photometer sampling module 200 and the downstream photometer sampling module 300 of the filtering efficiency real-time calibration device as much as possible, the filtering efficiency real-time calibration device adds measurement of CF (photometer correlation factor) in the main control board 400 system.
The flow rate of the filtering efficiency detection device 100 is adjusted to 85L/min+/-2.5%, and the upstream photometer sampling module 200 and the downstream photometer sampling module 300 are started under the state that no filtering material is placed, so that the CF value is between 0.90 and 1.1;
then selecting glass fiber filter paper or equivalent filter paper with the filtering efficiency of about 85% and 95%, installing between the upper clamp 105 and the lower clamp 106, clamping, and recording the filtering efficiency of the real-time calibrating device after the reading number is stableEm2 and filtration efficiency of filtration efficiency detection deviceEm1；
And continuously and alternately measuring N times (for example, 3 times, testing in a non-loading state, and the total measurement time is not longer than 6 min) according to the method, calculating a single filtration efficiency indication error according to a formula Deltai= (Em 1-Em 2) multiplied by 100%, and taking an N times arithmetic average value as the filtration efficiency indication error. In the formula, deltai is a single filtering efficiency indicating error, em1 is the filtering efficiency of the filtering efficiency detection device, and Em2 is the filtering efficiency of the filtering efficiency real-time calibration device.
If the instrument is provided with both a saliency and an oily aerosol generator, the error of the filtration efficiency indication value of the instrument should be detected respectively.
When the test conditions are changed, a new filter paper should be replaced.
The consistency of the upstream and downstream photometers is maintained to the greatest extent by the measurement of the fitting algorithm CF (photometer correlation factor), and the hardware error of the filtering efficiency detecting device 100 is eliminated, so that the aerosol concentrations in the upper and lower jigs are equal when no filter material is put in.
In some embodiments of the present utility model, the upstream photometer sampling module 200 includes an upstream aerosol inlet 201, one end of the upstream aerosol inlet 201 is connected to the upper fixture 105 through a pipeline, the other end is connected to an upstream bypass tee 202, aerosol flowing out of the upstream bypass tee 202 is divided into two paths, one path flows into an upstream photometer sampler 205, the other path flows into the upstream photometer sampler 205 through an upstream shielding gas filter 203 and an upstream shielding gas orifice flowmeter 204, and the upstream photometer sampler 205 is connected to the main control board 400 through a pipeline.
The outlet end of the upstream photometer sampler 205 is connected in sequence to an upstream filter 207, an upstream orifice flowmeter 208, and an upstream sampling pump 210 via pipes. An upstream air volume 209 is provided between the upstream orifice flow meter 208 and the upstream sampling pump 210.
During calibration measurement, a part of aerosol in the inner cavity of the upper clamp 105 flows into the upstream flow dividing tee 202 through the upstream aerosol inlet 201 to be divided, one path of aerosol is cleaned through the upstream protective gas filter 203, a clean protective gas is formed through the upstream protective gas orifice flowmeter 204 to return to the upstream photometer sampler 205, the other path of aerosol enters the upstream photometer sampler 205 to detect the concentration of the aerosol, the aerosol is changed into clean aerosol through the upstream filter 207 under the action of the upstream sampling pump 210, the real-time flow of the upstream sampling pump 210 is regulated through the upstream orifice flowmeter 208, and the upstream gas volume 209 is used for stabilizing the stability of the airflow in the upstream photometer sampler 205, and in addition, an aerosol real-time concentration electric signal is obtained through the upstream photometer circuit board 206 and is transmitted to the main control board 400.
In some embodiments of the present utility model, the downstream photometer sampling module 300 includes a downstream aerosol inlet 301, one end of the downstream aerosol inlet 301 is connected to the lower fixture 106 through a pipeline, the other end is connected to a downstream bypass tee 302, the aerosol flowing out of the downstream bypass tee 302 is divided into two paths, one path flows into a downstream photometer sampler 305, the other path flows into the downstream photometer sampler 305 through a downstream shielding gas filter 303 and a downstream shielding gas orifice flowmeter 304, and the downstream photometer sampler 305 is connected to the main control board 400 through a pipeline.
The outlet end of the downstream photometer sampler 305 is connected in series by a pipeline to a downstream filter 307, a downstream orifice flowmeter 308, and a downstream sampling pump 310. A downstream air volume 309 is provided between the downstream orifice flow meter 308 and the downstream sampling pump 310.
During calibration measurement, a part of aerosol in the inner cavity of the lower clamp 106 flows into the downstream flow dividing tee 302 through the downstream aerosol inlet 301 to be divided, one path of aerosol is cleaned through the downstream protective gas filter 303, a clean protective gas is formed through the downstream protective gas orifice flowmeter 304 to return to the downstream photometer sampler 305, the other path of aerosol enters the downstream photometer sampler 305 to detect the concentration of the aerosol, under the action of the downstream sampling pump 310, the aerosol is changed into clean aerosol through the downstream filter 307, and the real-time flow of the downstream sampling pump 310 is regulated through the downstream orifice flowmeter 308, wherein the downstream gas volume 309 is used for stabilizing the stability of the airflow in the downstream photometer sampler 305, and in addition, an aerosol real-time concentration electric signal is obtained through the downstream photometer circuit board 306 and is transmitted to the main control board 400.
In some embodiments of the present utility model, the upper fixture 105 is provided with an upstream access port for accessing the upstream photometer sampling module 200, and the lower fixture 106 is provided with a downstream access port for accessing the downstream photometer sampling module 300, so that the installation and the use are facilitated.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (8)
1. A real-time particulate matter filtration efficiency calibration device, comprising:
the filter efficiency detection module comprises an aerosol generating part, an upper clamp, a lower clamp and an aerosol discharging part, wherein a filter material to be tested is clamped between the upper clamp and the lower clamp, and aerosol generated by the aerosol generating part sequentially flows through the upper clamp, the filter material and the lower clamp and is discharged through the aerosol discharging part;
an upstream photometer sampling module connected with the upper clamp through a pipeline for detecting the concentration of aerosol before flowing through the filter material;
a downstream photometer sampling module connected to the lower jig through a pipe for detecting the concentration of the aerosol after flowing through the filter material;
the main control board is used for receiving detection data of the upstream photometer sampling module and the downstream photometer sampling module;
and the display screen is connected with the main control board and used for displaying the data information received and calculated by the main control board.
2. The device for calibrating the filtration efficiency of the particulate matter according to claim 1, wherein,
the upstream photometer sampling module comprises an upstream aerosol inlet, one end of the upstream aerosol inlet is connected with the upper clamp through a pipeline, the other end of the upstream aerosol inlet is connected with an upstream shunt tee joint, aerosol flowing out of the upstream shunt tee joint is divided into two paths, one path of aerosol flows into an upstream photometer sampler, the other path of aerosol flows into the upstream photometer sampler through an upstream shielding gas filter and an upstream shielding gas orifice flowmeter, and the upstream photometer sampler is connected with the main control board through a pipeline.
3. The device for calibrating the filtration efficiency of the particulate matter in real time according to claim 2, wherein,
the air outlet end of the upstream photometer sampler is sequentially connected with an upstream filter, an upstream orifice flowmeter and an upstream sampling pump through pipelines.
4. The device for calibrating the filtration efficiency of the particulate matter according to claim 3, wherein,
an upstream air volume is arranged between the upstream orifice flowmeter and the upstream sampling pump.
5. The device for calibrating the filtration efficiency of the particulate matter according to claim 1, wherein,
the downstream photometer sampling module comprises a downstream aerosol inlet, one end of the downstream aerosol inlet is connected with the lower clamp through a pipeline, the other end of the downstream aerosol inlet is connected with a downstream shunt tee joint, aerosol flowing out of the downstream shunt tee joint is divided into two paths, one path of aerosol flows into a downstream photometer sampler, the other path of aerosol flows into the downstream photometer sampler through a downstream protective gas filter and a downstream protective gas orifice flowmeter, and the downstream photometer sampler is connected with the main control board through a pipeline.
6. The device for calibrating the filtration efficiency of the particulate matter according to claim 5, wherein,
the gas outlet end of the downstream photometer sampler is sequentially connected with a downstream filter, a downstream orifice flowmeter and a downstream sampling pump through pipelines.
7. The device for calibrating the filtration efficiency of the particulate matter according to claim 6, wherein,
a downstream air volume is arranged between the downstream orifice flowmeter and the downstream sampling pump.
8. The apparatus for calibrating the filtration efficiency of particulate matter according to any one of claim 1 to 7, wherein,
an upstream access port for accessing the upstream photometer sampling module is arranged on the upper clamp;
and a downstream access port for accessing the downstream photometer sampling module is arranged on the lower clamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320381368.1U CN219657442U (en) | 2023-03-03 | 2023-03-03 | Real-time calibrating device for particulate matter filtering efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320381368.1U CN219657442U (en) | 2023-03-03 | 2023-03-03 | Real-time calibrating device for particulate matter filtering efficiency |
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| CN219657442U true CN219657442U (en) | 2023-09-08 |
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| CN202320381368.1U Active CN219657442U (en) | 2023-03-03 | 2023-03-03 | Real-time calibrating device for particulate matter filtering efficiency |
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