CN212748661U - Detection clamp for improving aerosol diffusion uniformity - Google Patents

Abstract

The utility model provides an improve detection anchor clamps of aerosol diffusion homogeneity, including last anchor clamps and lower anchor clamps, upward be provided with the diffusion chamber of tapered in the anchor clamps, go up the anchor clamps upper end and be connected with the surge chamber, go up the surge chamber upper end and be provided with the aerosol entry, be provided with the chamber that converges of back taper in the anchor clamps down, the anchor clamps lower extreme is connected with down the surge chamber down, and the aerosol export is connected to lower surge chamber lower extreme. The utility model discloses set up multistage cavity and make the aerosol that gets into anchor clamps fully stable and even filter material that sees through behind the mixing, shortened detecting element's reaction time, can effectively promote the precision that concentration detection and filtration efficiency detected.

Description

Detection clamp for improving aerosol diffusion uniformity

Technical Field

The utility model belongs to respiratory filter check out test set field especially relates to improve aerosol diffusion homogeneity's detection anchor clamps.

Background

In recent years, various respiratory infectious diseases have been abused, so that the health and life safety of human beings are seriously threatened, and the transmission of viruses among people can be effectively weakened by wearing a respiratory filter (such as a mask and a gas mask). The protective effect of a breathing filter depends mainly on its filtering efficiency for particles in the air. Therefore, in the production process of the breathing filter and the raw materials thereof, the qualified rate of the finished breathing filter and the effectiveness of the protection effect can be ensured only by reasonably and effectively detecting the filtering efficiency of the breathing filter and the raw materials.

At present, the relevant national standard GB2626-2019 respiratory protection self-absorption filter type particulate-proof respirator for detecting the particulate filtering efficiency of a respiratory filter is stipulated, and salt and oil aerosols are respectively adopted to detect KN filter materials and KP filter materials. The basic principle is that aerosol uniformly penetrates through a filter material under the action of stable airflow, then the concentration of the aerosol at the upstream before the aerosol penetrates through the filter material and the concentration of the aerosol at the downstream after the aerosol penetrates through the filter material are respectively detected, and the ratio of the downstream concentration to the upstream concentration is the filtering efficiency of the filter material.

The uniformity of the aerosol when penetrating through the filter material has great influence on the value of the filtering efficiency, and if the aerosol is concentrated near a sampling port, the concentration detection value is higher; if the aerosol concentrates at a certain point deviated from the sampling opening, the concentration detection value is low, and the upstream and downstream concentration deviation caused by the uneven distribution of the aerosol before and after passing through the filter material can cause the unreasonable, inaccurate and unstable detection result of the filtering efficiency. The clamp of the existing particulate matter filtering efficiency detection device comprises an upper clamp and a lower clamp which are of a hollow structure, the upper end of the upper clamp is connected with an aerosol inlet, the lower end of the lower clamp is connected with an aerosol outlet, and the aerosol cannot be ensured to uniformly penetrate through a filter material due to the structure of the clamp, so that the detection result is inaccurate.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to foretell current particulate matter filtration efficiency detection device's anchor clamps can't ensure that the aerosol evenly sees through the technical problem of filter material, provide an aerosol fully spreads the mixing that makes get into anchor clamps to even see through the filter material, effectively promote the anchor clamps that concentration detection and filtration efficiency detected the precision.

In order to achieve the above object, the utility model discloses a technical scheme be:

the utility model provides an improve detection anchor clamps of aerosol diffusion homogeneity, includes anchor clamps and lower anchor clamps, upward be provided with the diffusion chamber of tapered in the anchor clamps, upward the anchor clamps upper end is connected with the surge chamber, and upward the surge chamber upper end is provided with the aerosol entry, be provided with the chamber that gathers of back taper in the anchor clamps down, the anchor clamps lower extreme is connected with down the surge chamber, and the aerosol export is connected to lower surge chamber lower extreme.

Preferably, a necking part is arranged at the upper end of the lower buffer chamber.

Preferably, the upper clamp is provided with an upstream sampling port communicated with the diffusion cavity.

Preferably, the lower clamp is provided with a downstream sampling port communicated with the collecting cavity.

Preferably, the lower end surface of the upper clamp and the upper end surface of the lower clamp are both provided with a gasket.

Preferably, the sealing pad is a silica gel pad.

Preferably, an O-ring is installed between the upper clamp and the upper buffer chamber.

Preferably, the lower clamp is provided with a flange.

Preferably, the upper end of the upper clamp is provided with a threaded hole, and the threaded hole is connected with the driving rod.

Compared with the prior art, the utility model discloses an advantage lies in with positive effect:

be provided with the diffusion chamber of tapered in the last anchor clamps, go up the anchor clamps upper end and be connected with the surge chamber, aerosol reaches stable state through the volume diffusion and the cushioning effect and the mixing of last surge chamber, then gets into the toper diffusion chamber further diffusion of last anchor clamps, and this makes the aerosol air current that gets into upstream detecting element through upper reaches sample connection stable even, has shortened aerosol concentration detecting element's reaction time to it is more accurate to make the concentration detection result.

The lower clamp is internally provided with an inverted cone-shaped collecting cavity, aerosol is uniformly distributed above the filter material after passing through the diffusion cavity of the upper clamp, and the aerosol can stably and uniformly permeate the filter material by combining the collecting cavity arranged at the lower part of the filter material.

The chamber that converges of back taper guarantees that most aerosol gets into down the cushion chamber, and further lower anchor clamps lower extreme is connected with down the cushion chamber, and the shrinkage of cushion chamber and the effect of redistributing make the aerosol in the cushion chamber distribute evenly down, make the aerosol air current that gets into low reaches detecting element stable even, have shortened the reaction time of aerosol concentration detecting element to make the concentration testing result more accurate. The detection device using the detection clamp can improve the accuracy of detection of the filtering efficiency.

Drawings

FIG. 1 is a schematic structural view of the inspection jig of the present invention;

FIG. 2 is a cross-sectional view of the inspection jig of the present invention;

in the above figures: 1. an upper buffer chamber; 11. an aerosol inlet; 12. a threaded hole; 2. an upper clamp; 21. a diffusion chamber; 22. an upstream sampling port; 3. a lower clamp; 31. a collection chamber; 4. a lower buffer chamber; 41. a downstream sampling port; 42. a necking part; 43. a buffer section; 44. an aerosol outlet; 5. a flange; 6. a groove; 7. an O-shaped ring; 8. a gasket; 9. and (3) filtering the material.

Detailed Description

For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Example (b): as shown in fig. 1 and 2, a detection fixture for improving aerosol diffusion uniformity includes an upper fixture 2 and a lower fixture 3, wherein a conical diffusion cavity 21 is disposed in the upper fixture 2. The upper end of the upper clamp 2 is connected with an upper buffer chamber 1, the upper end of the upper buffer chamber 1 is provided with an aerosol inlet 11, the upper buffer chamber 1 is of a hollow structure, and the upper clamp 2 and the upper buffer chamber 1 are both cylindrical and are coaxially mounted. The lower extreme of specific last cushion chamber 1 is provided with flange 5, passes through bolt fixed connection between flange 5 and the last anchor clamps 2, for guaranteeing anchor clamps 2 and the leakproofness of last cushion chamber 1, is provided with annular groove 6 on the up end of last anchor clamps 2, installs O type circle 7 in the annular groove 6.

The lower clamp 3 is internally provided with an inverted cone-shaped collecting cavity 31, the lower end of the lower clamp 3 is connected with a lower buffer chamber 4, and the lower end of the lower buffer chamber 4 is connected with an aerosol outlet 44. The hollow chamber inside the lower buffer chamber 4 is divided into two parts, the upper part is a necking part 42 with smaller diameter, the lower part is a buffer part 43 with larger diameter, and the inner diameter of the buffer part 43 is 2-5 times of the inner diameter of the necking part 42. The upper end of the lower buffer chamber 4 is provided with a flange 5, the flange 5 is fixedly connected with the lower clamp 3 through a bolt, an annular groove 6 is arranged on the lower end face of the lower clamp 3 for ensuring the sealing performance of the lower clamp 3 and the lower buffer chamber 4, and an O-shaped ring 7 is arranged in the annular groove 6. The lower end of the lower buffer chamber 4 is provided with an aerosol outlet 44, and the aerosol outlet 44 is connected to the centrifugal fan through a connecting pipe.

The upper clamp 2 is provided with an upstream sampling port 22 communicated with the diffusion cavity 21, the lower clamp 3 is provided with a downstream sampling port 41 communicated with the collection cavity 31, and the upstream sampling port 22 and the downstream sampling port 41 are used for sampling and detecting the concentration of the particles in the aerosol.

During the detection, wait to detect the filter material and install between last anchor clamps 2 and lower anchor clamps 3, the lower terminal surface of going up anchor clamps 2 and the up end of lower anchor clamps 3 all install sealed 8, and sealed 8 of preferably sealing up is the silica gel pad, can also adopt elastic substance such as rubber pad certainly. The sealing gasket 8 can firmly clamp the filtering material 9, and meanwhile, the sealing performance between the upper clamp 3 and the lower clamp 3 is guaranteed, and air leakage is prevented.

The lower clamp 3 is provided with a flange 5, the lower clamp 3 is fixed on the workbench through the flange 5, the upper end of the upper clamp 2 is provided with a threaded hole 12, a driving rod is connected in the threaded hole 12, and the upper clamp 2 is driven by the driving rod to move up and down.

The working process of the detection clamp for improving the aerosol diffusion uniformity comprises the following steps: before testing, the filter material 9 is placed between the clamp and the lower clamp 3 and is unfolded and laid on the sealing gasket 8 of the lower clamp 3; then the upper clamp 2 is pressed downwards, and the sealing gasket 8 is tightly pressed with the filter material to realize sealing; aerosol medium enters the upper buffer chamber 1 from the aerosol inlet 11 through an external pipeline, and is buffered and uniformly mixed through volume diffusion; the aerosol then moves downward into the diffusion chamber 21 under the action of the centrifugal fan, and further diffuses to uniformity in the inverted conical space of the diffusion chamber 21. The external measurement element draws a quantity of aerosol at the upstream sampling port 22 to enable detection of the upstream aerosol concentration. When the aerosol enters the lower clamp 3 from the upper clamp 2, the aerosol meets the filtering material 9, the aerosol particles with larger particle sizes are filtered on the surface of the filtering material 9, the aerosol particles with smaller particle sizes penetrate through the filtering material 9 and enter the collecting cavity 31, and the aerosol penetrating through the filtering material 9 uniformly shrinks and collects and enters the lower buffer cavity because the collecting cavity 31 is in an inverted cone shape. The aerosol is collected by the necking part 42 and enters the buffering part 43 for volume diffusion, and the aerosol is dispersed uniformly after being collected. The external measurement element draws a quantity of aerosol at the downstream sampling port 41 to enable detection of the downstream aerosol concentration. The remaining aerosol enters the centrifugal fan through the aerosol outlet 44 and the rear end pipeline, and then passes through the filter discharge pipeline.

Aerosol gets into anchor clamps 2 and then reaches stable and abundant mixing's state through the volume diffusion and the cushioning effect of last cushion chamber earlier, then gets into the toper diffusion chamber further diffusion of anchor clamps 2, and this makes the aerosol air current that gets into the upstream detecting element through upstream sample connection 22 stable even, has shortened the reaction time of aerosol concentration detecting element to make concentration detection result more accurate.

The aerosol passes through the diffusion cavity 21 of the upper clamp 2 and then is uniformly distributed above the filter material, and the aerosol can stably and uniformly permeate the filter material by combining the collecting cavity 31 arranged at the lower part of the filter material. The filter material is collected by the inverted cone-shaped collecting cavity 31 of the lower clamp 3 after passing through the filter material, and most of aerosol is guaranteed to enter the lower buffer cavity. The aerosol in the lower buffer cavity is uniformly distributed under the contraction and re-diffusion effects of the lower buffer cavity, so that the aerosol airflow entering the downstream detection unit is stable and uniform, the reaction time of the aerosol concentration detection unit is shortened, the concentration detection result is more accurate, and the detection precision of the filtering efficiency is improved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.

Claims (9)

1. The utility model provides an improve detection anchor clamps of aerosol diffusion homogeneity, includes anchor clamps and lower anchor clamps, its characterized in that: the improved aerosol generator is characterized in that a conical diffusion cavity is arranged in the upper clamp, the upper end of the upper clamp is connected with an upper buffer chamber, an aerosol inlet is formed in the upper end of the upper buffer chamber, an inverted cone-shaped collecting cavity is arranged in the lower clamp, the lower end of the lower clamp is connected with a lower buffer chamber, and the lower end of the lower buffer chamber is connected with an aerosol outlet.

2. The inspection fixture of claim 1, wherein: and a necking part is arranged at the upper end of the lower buffer chamber.

3. The inspection fixture of claim 1, wherein: and an upstream sampling port communicated with the diffusion cavity is arranged on the upper clamp.

4. The inspection fixture of claim 3, wherein: and a downstream sampling port communicated with the collecting cavity is arranged on the lower clamp.

5. The inspection fixture of claim 1, wherein: and sealing gaskets are respectively arranged on the lower end surface of the upper clamp and the upper end surface of the lower clamp.

6. The inspection fixture of claim 5, wherein: the sealing gasket is a silica gel gasket.

7. The inspection fixture of claim 1, wherein: an O-shaped sealing ring is arranged between the upper clamp and the upper buffer chamber.

8. The inspection fixture of claim 1, wherein: and a flange plate is arranged on the lower clamp.

9. The inspection fixture of claim 1, wherein: the upper end of the upper clamp is provided with a threaded hole, and the threaded hole is connected with a driving rod.

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