CN212807973U

CN212807973U - Mask particulate matter filtration efficiency testing arrangement

Info

Publication number: CN212807973U
Application number: CN202021776902.1U
Authority: CN
Inventors: 彭涛; 崔文立
Original assignee: Quanzhou Jiesite Instrument Equipment Co ltd
Current assignee: Quanzhou Jiesite Instrument Equipment Co ltd
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2021-03-26
Anticipated expiration: 2030-08-24

Abstract

The utility model relates to a mask particulate matter filtration efficiency testing device, which comprises a frame, wherein at least two testing mechanisms are arranged on the frame, each testing mechanism comprises a first filter, a fan, an aerosol generator, a mixing tank and an upstream pipeline which are sequentially connected in a conducting manner, and the testing mechanism also comprises a downstream pipeline, a second filter, a driving device and one or two photometers; at least one of the testing devices is provided with an electrostatic neutralizer. The utility model relates to a gauze mask testing arrangement field adopts two accredited testing organization to carry out salt nature test and oil test to the gauze mask respectively, has reduced cleaning equipment's number of times, and the static of salt nature granule can be eliminated to the static neutralizer for the test is more accurate, has solved gauze mask particulate matter filtration efficiency testing arrangement structure complicacy, manufacturing cost is high, difficult operation and debugging, need often cleaning equipment when oil test and salt nature test switch, and efficiency of software testing is low, measures unsafe technical problem.

Description

Mask particulate matter filtration efficiency testing arrangement

Technical Field

The utility model relates to a gauze mask testing arrangement field especially relates to a gauze mask particulate matter filtration efficiency testing arrangement.

Background

The mask has the function of adsorbing and blocking particles, smoke, microorganisms and the like by the filter material without being inhaled by a human body, thereby achieving the purpose of blocking toxic and harmful substances and protecting the human body from being damaged. After the mask is produced, the performance of the mask needs to be tested, such as: the gas exchange pressure difference test of gauze mask, the blood penetration test of gauze mask, the particulate matter filtration efficiency test of gauze mask. Different masks are required to be different, testing devices are different, two kinds of oily tests and salt tests are generally adopted for testing the filtering efficiency of the particles of the masks, the oily tests are adopted for some masks, oil such as corn oil and glycerin is sprayed out through an oily aerosol generator, the oily particles pass through the masks, the concentrations of the particles on two sides of the masks, namely C1 (before filtering) and C2 (after filtering), are respectively detected through a photometer within a set time, and the filtering efficiency of the masks is calculated to be (C1-C2)/C1, and the penetration rate of the masks can also be calculated to be C2/C1; some masks need to adopt a salt test, in the salt test, sodium chloride is usually passed through a salt aerosol generator to generate tiny salt particles, and the concentrations of the particles on two sides of the mask, namely C1 (before filtration) and C2 (after filtration), are respectively detected by a photometer within a set time, so as to calculate the filtration efficiency of the mask. In the conventional mask particulate matter filtering efficiency testing device, in order to save the testing cost, an oil test and a salt test are usually carried out by adopting the same pipeline on one device, when the oil test and the salt test are switched, the device needs to be completely cleaned, gas and liquid in the device need to be cleaned by adopting gas and water, the cleaning workload is large, and oily and salt substances are easy to remain in the device, so that the testing is inaccurate; the photometer is arranged in the testing device, so that the cleaning difficulty is high, equipment is cleaned frequently, the photometer is easy to damage during cleaning, the service life of the photometer is shortened, and the production testing efficiency is reduced; during an oiliness test, the particles and the liquid have certain humidity after being sprayed out, and static electricity is relatively less; during the salt property test, the sprayed water is less, the salt particles are dry, static electricity is easily generated under the dry condition, the salt particles with static electricity are adopted for the filtration test, and the salt particles are easily adsorbed on the mask or the inner wall of equipment, so that the accuracy of the test is influenced; the existing testing device is complex in structure, high in production cost, not easy to maintain, high in equipment debugging operation difficulty and inaccurate in measurement.

Patent application No.: 201821536078.5, discloses a mask filtering performance tester, including mask efficiency resistance measurement anchor clamps and breathing gas resistance measurement module, the mask filtering performance tester passes through mask efficiency resistance measurement anchor clamps and breathing gas resistance measurement module can accomplish better test to the filtering performance of gauze mask. When the device is switched between an oil test and a salt test, the equipment needs to be completely cleaned, gas and liquid in the equipment need to be cleaned by gas and water, the cleaning workload is large, oily and salt substances are easy to remain in the equipment, so that the test is inaccurate, and the photometer is arranged in the test device, so that the cleaning difficulty is large, the photometer is easy to damage during cleaning, the service life of the photometer is shortened, the production test efficiency is reduced, and the production cost is increased; during the salt property test, the sprayed water is less, the salt particles are dry, static electricity is easily generated under the dry condition, the salt particles with static electricity are adopted for the filtration test, and the salt particles are easily adsorbed on the mask or the inner wall of equipment, so that the accuracy of the test is influenced; when the mask is tested, the mask needs to be worn on the international head model, the size and the shape of the produced mask are different, when different people use the mask, the contact area of a human body and the face of the mask is different, different masks and different users need to adopt different international head models for testing, the operation is complicated, if the international head model is not matched with the mask, the airtightness is poor when the mask is worn, and the test is inaccurate; and when the gauze mask was worn and is tested on international head model, the gauze mask received the effect of gas and particulate matter for a long time, probably had the clearance between gauze mask and the international head model, and gas flows from the clearance, influences the accuracy of test.

SUMMERY OF THE UTILITY MODEL

Therefore, to foretell problem, the utility model provides a gauze mask particulate matter filtration efficiency testing arrangement. It has solved gauze mask particulate matter filtration efficiency testing arrangement structure complicacy, high, the difficult operation of manufacturing cost and debugging, need often cleaning equipment when oily test and salt nature test switch, and efficiency of software testing is low, measures inaccurate technical problem.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a mask particulate matter filtering efficiency testing device comprises a rack, wherein at least two testing mechanisms are arranged on the rack, each testing mechanism comprises a first filter, a fan, an aerosol generator, a mixing tank and an upstream pipeline which are sequentially connected in a conduction mode, the testing mechanism further comprises a downstream pipeline, a second filter, a driving device and one or two photometers, the fan is respectively connected with a first air outlet pipe and a second air outlet pipe, the first air outlet pipe is connected with the aerosol generator, the second air outlet pipe is connected with the mixing tank, a first electromagnetic valve is arranged on the first air outlet pipe, and a second electromagnetic valve is arranged on the second air outlet pipe; the photometer is connected with a third electromagnetic valve through an air exhaust pipeline; when the number of the photometers of the testing mechanism is one, the third electromagnetic valve is respectively connected with the upstream pipeline and the downstream pipeline in a conduction manner; when the photometers of the testing mechanism are two, one third electromagnetic valve is connected with the upstream pipeline, and the other third electromagnetic valve is connected with the downstream pipeline; the driving device drives and transmits an upstream pipeline and/or a downstream pipeline to move, and the upstream pipeline and the downstream pipeline can be in closed and conductive connection; at least one of the testing devices is provided with an electrostatic neutralizer, and the aerosol generator of the testing device is connected with the mixing tank through the electrostatic neutralizer.

Further:

the testing mechanism further comprises a differential pressure sensor, and the differential pressure sensor is respectively connected to the upstream pipeline and the downstream pipeline in a conduction mode.

The mixing tank is connected with a concentration sensor.

The outer side wall of the upstream pipeline and/or the outer side wall of the downstream pipeline are corrugated.

And a flow control valve is arranged between the mixing tank and the upstream pipeline.

And a control screen is arranged on the rack.

By adopting the technical scheme, the beneficial effects of the utility model are that:

the utility model discloses be equipped with two at least accredited testing organization, one of them accredited testing organization can be used to the oily particulate matter filtration test of gauze mask, and one of them accredited testing organization can be used to the salt particulate matter filtration test of gauze mask, adopts a control system to control two at least accredited testing organization respectively, has practiced thrift the cost, and salt test and oily test separately detect, has greatly reduced the number of times of cleaning equipment, has reduced the abluent number of times of photometer, has increased the life-span of photometer; during the salt test, air is sucked into the first filter through the fan, the filtered air enters the aerosol generator, the aerosol generator generates salt particles, the air drives the salt particles to enter the static neutralizer, the static neutralizer eliminates the static electricity of the salt particles, the salt particles are prevented from being adhered to the mask, an upstream pipeline or a downstream pipeline due to the electrostatic effect, and the salt test is more accurate due to the use of the static neutralizer; the salt particles enter the mixing tank, at the moment, the content of the salt particles in the air is high, the second electromagnetic valve is opened, the fan discharges the air into the mixing tank through the second air outlet pipe, and the salt particles are diluted, so that the concentration of the particles reaches the standard of the test; the driving device can be used for connecting the upstream pipeline and the downstream pipeline in a closed and conductive manner, the mask is clamped and fixed between the upstream pipeline and the downstream pipeline, salt particles discharged from the mixing tank sequentially pass through the upstream pipeline, the mask and the downstream pipeline, gas is discharged from the second filter, the photometer sucks gas in the upstream pipeline, the concentration of the particles in the upstream pipeline is measured, a concentration value is recorded in the system, the photometer sucks gas in the downstream pipeline, the concentration of the particles in the downstream pipeline is measured, the concentration value is recorded in the system, and the system calculates the salinity filtering efficiency of the mask and also can calculate the penetration rate of the mask; when the oiliness is tested, the oiliness testing mechanism is not provided with a static neutralizer generally, so that the production cost can be saved; the mask is clamped by the upstream pipeline and the downstream pipeline, so that the air tightness is good, gas and particles cannot go outside, and the test is accurate; the utility model has simple operation, the staff can learn to use the measuring device in a short time, the test is quick and simple, the maintenance of the equipment is convenient, the production cost is low, the testing filtration efficiency value is accurate, and the testing efficiency is high; furthermore, the testing mechanism comprises a pressure difference sensor which can respectively detect the pressure difference at two sides of the mask, so that the resistance and the air permeability of the mask during breathing can be tested, whether the mask has difficulty in breathing under the condition of different breathing intensities can be tested by controlling the flow rate of the gas, meanwhile, the cost for purchasing a mask gas exchange pressure tester is saved, the testing time is saved, and the testing efficiency is improved; furthermore, the mixing tank is connected with a concentration sensor, the concentration of the particulate matters in the mixing tank can be measured through the concentration sensor, and then the concentration is fed back to the main controller, so that the opening and closing of the second electromagnetic valve are controlled, air enters the mixing tank from the second air outlet pipe to dilute the particulate matters, the concentration of the particulate matters reaches the standard of testing through automatic adjustment, the testing is more accurate, the filtering efficiency of the mask under different concentrations can be tested through setting the concentrations of different particulate matters, the testing is more comprehensive, and the quality of the produced mask is better; furthermore, the outer side wall of the upstream pipeline and/or the outer side wall of the downstream pipeline are corrugated, the corrugated structure has a good anti-seismic effect, a gap is not easy to exist between the upstream pipeline and the downstream pipeline, and the test is more accurate; furthermore, the flow control valve can control the flow of gas and particles flowing into an upstream pipeline, and can test the filtering efficiency, the penetration rate and the pressure difference of the mask at different flow rates; further, the utility model discloses an automatic control system control, it is intelligent high, convenient operation, and it is accurate to measure.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic connection diagram of the salt testing mechanism of the present invention;

FIG. 3 is a schematic connection diagram of the oiliness test mechanism of the present invention;

fig. 4 is a schematic connection diagram of two photometers arranged on the salt testing mechanism of the utility model.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1 and fig. 4, the embodiment provides a device for testing particulate matter filtering efficiency of a mask, including a frame 1, two testing mechanisms are arranged on the frame 1, each testing mechanism includes a first filter 21, a fan 22, an aerosol generator 23, a mixing tank 24, and an upstream pipeline 25, which are sequentially connected, and further includes a downstream pipeline 26, a second filter 27, a driving device 251, and a photometer 28, the fan 22 is respectively connected to a first air outlet pipe 221 and a second air outlet pipe 222, the first air outlet pipe 221 is connected to the aerosol generator 23, the second air outlet pipe 222 is connected to the mixing tank 24, a first electromagnetic valve 223 is arranged on the first air outlet pipe 221, and a second electromagnetic valve 224 is arranged on the second air outlet pipe 222; the photometer 28 is connected with a third electromagnetic valve 281 through an air exhaust pipeline 280, and the third electromagnetic valve 281 is respectively connected with the upstream pipeline 25 and the downstream pipeline 26 in a conduction way; the driving device 251 drives the transmission upstream pipeline 25 to move, the upstream pipeline 25 and the downstream pipeline 26 can be in closed and conductive connection, and the outer side walls of the upstream pipeline 25 and the downstream pipeline 26 are corrugated; one of the testing devices is provided with a static neutralizer 29, the aerosol generator 23 of the testing device is connected with the mixing tank 24 through the static neutralizer 29, the mixing tank 24 is connected with a concentration sensor 241, and a flow control valve 242 is arranged between the mixing tank 24 and the upstream pipeline 25; the testing mechanism further comprises a differential pressure sensor 20, the differential pressure sensor 20 being in fluid communication with an upstream conduit 25 and a downstream conduit 26, respectively. The rack 1 is provided with a control screen 11 for controlling and debugging the device.

Referring to fig. 4, each testing mechanism may also be provided with two photometers 28 and two third solenoid valves 281, and the two photometers 28 respectively pass through the two third solenoid valves 281 and the upstream pipeline 25 and the downstream pipeline 26, which is a structure that is expensive to produce, but the two photometers 28 can simultaneously measure the concentration of the particulate matters in the upstream pipeline 25 and the downstream pipeline 26, and the measuring speed and the testing efficiency are high.

The mixing tank 24 may not be connected to a concentration sensor 241, and this structure makes it difficult to precisely control the concentration of the particulate matter in the mixing tank 24.

The driving device 251 may be a telescopic cylinder, a linear motor or other driving devices 251, which are well known devices and will not be described herein.

Three, four or even more testing mechanisms can be arranged on the frame 1, and at least one testing mechanism is provided with the static neutralizer 29 according to the situation.

The differential pressure sensor 20, the blower 22, the photometer 28, the aerosol generator 23, the static neutralizer 29, the first filter 21, and the second filter 27 are well known devices and will not be described herein again.

The concentration sensor 241 is a well-known device, and will not be described in detail herein.

The outer side wall of the upstream pipe 25 may not be corrugated, and the outer side wall of the downstream pipe 26 may not be corrugated, as the case may be.

The utility model discloses can set up the control valve between each process and flow in the control of outflow to gas, for well-known technique, no longer describe here.

The utility model discloses an oily accredited testing organization also can set up static neutralizer 29, has nevertheless increased the cost of production, specifically sets up according to the condition.

The utility model discloses a PLC or other automatic control system control, for publicly known technological means, no longer give unnecessary details here.

The utility model discloses a working method is:

the utility model discloses two test mechanisms on frame 1, one is used for gauze mask salt nature particulate matter filtration efficiency test, and another test mechanism is used for gauze mask oily particulate matter filtration efficiency test, and the test principle of two test mechanisms is similar; referring to fig. 2, during the salt test, the mask is placed on the downstream pipeline 26, the upstream pipeline 25 is driven to move by the driving device 251, the upstream pipeline 25 and the downstream pipeline 26 are conducted and closed, meanwhile, the mask is clamped between the upstream pipeline 25 and the downstream pipeline 26, air is sucked into the first filter 21 through the fan 22, the filtered air enters the aerosol generator 23, the aerosol generator 23 generates salt particles, the air drives the salt particles to enter the static neutralizer 29, the static neutralizer 29 eliminates static electricity of the salt particles, the salt particles enter the mixing tank 24, at this time, the content of the salt particles in the air is high, the second electromagnetic valve 224 is opened, and the fan 22 discharges the air into the mixing tank 24 through the second air outlet pipe 222 to dilute the salt particles, so that the concentration of the particles reaches the test standard; the salt particles discharged from the mixing tank 24 pass through an upstream pipe 25, a mask, and a downstream pipe 26 in this order, the gas is exhausted from the second filter 27, the photometer 28 takes in the gas in the upstream line 25, measures the concentration of the particles in the upstream line 25, records the concentration value in the system, the photometer 28 takes in the gas in the downstream line 26 again, measures the concentration of the particles in the downstream line 26, records the concentration value in the system, the photometer 28 repeatedly measures the concentrations of the particles in the upstream line 25 and the downstream line 26, after the upstream pipeline 25 is tested for 20 seconds, the downstream pipeline is tested for 20 seconds, after repeated tests are carried out for a period of time, the system calculates the average value C1 of the concentration of the tested particles of the upstream pipeline 25, calculates the average value C2 of the concentration of the tested particles of the downstream pipeline 26, and calculates the filtering efficiency of the mask to be (C1-C2)/C1 or the penetration rate of the mask to be C2/C1; referring to fig. 3, for the oiliness test, the oiliness test is similar to the salt test principle, and the oiliness test mechanism is not provided with the electrostatic neutralizer 29; the differential pressure sensor 20 can respectively detect the pressure difference at the two sides of the mask, thereby testing the resistance and the air permeability of the mask during breathing.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a gauze mask particulate matter filtration efficiency testing arrangement which characterized in that: the testing device comprises a rack, wherein at least two testing mechanisms are arranged on the rack, each testing mechanism comprises a first filter, a fan, an aerosol generator, a mixing tank and an upstream pipeline which are sequentially connected in a conducting manner, the testing mechanism further comprises a downstream pipeline, a second filter, a driving device and one or two photometers, the fan is respectively connected with a first air outlet pipe and a second air outlet pipe, the first air outlet pipe is connected with the aerosol generator, the second air outlet pipe is connected with the mixing tank, a first electromagnetic valve is arranged on the first air outlet pipe, and a second electromagnetic valve is arranged on the second air outlet pipe; the photometer is connected with a third electromagnetic valve through an air exhaust pipeline; when the number of the photometers of the testing mechanism is one, the third electromagnetic valve is respectively connected with the upstream pipeline and the downstream pipeline in a conduction manner; when the photometers of the testing mechanism are two, one third electromagnetic valve is connected with the upstream pipeline, and the other third electromagnetic valve is connected with the downstream pipeline; the driving device drives and transmits an upstream pipeline and/or a downstream pipeline to move, and the upstream pipeline and the downstream pipeline can be in closed and conductive connection; at least one of the testing devices is provided with an electrostatic neutralizer, and the aerosol generator of the testing device is connected with the mixing tank through the electrostatic neutralizer.

2. The mask particulate matter filtration efficiency testing apparatus of claim 1, wherein: the testing mechanism further comprises a differential pressure sensor, and the differential pressure sensor is respectively connected to the upstream pipeline and the downstream pipeline in a conduction mode.

3. The mask particulate matter filtration efficiency testing apparatus of claim 1, wherein: the mixing tank is connected with a concentration sensor.

4. The mask particulate matter filtration efficiency testing apparatus of claim 1, wherein: the outer side wall of the upstream pipeline and/or the outer side wall of the downstream pipeline are corrugated.

5. The mask particulate matter filtration efficiency testing apparatus of claim 1, wherein: and a flow control valve is arranged between the mixing tank and the upstream pipeline.

6. The mask particulate matter filtration efficiency testing apparatus of claim 1, wherein: and a control screen is arranged on the rack.