CN101393066A - Mask and protective mask leakage test chamber - Google Patents

Abstract

The invention relates to a mask and a leakage test chamber of a protective mask. It includes a main chamber and its connected test gas generation system and detection system; the main chamber is connected with an auxiliary chamber in a detachable and sealed manner, and the main chamber is connected to a circulation system, which is part of the test gas cycle and the circulation volume can be adjusted manually. Regulated half-circulatory system. The invention has the advantages of environmental protection and energy saving, is small in size, is easy to disassemble and is suitable for transportation, and can be used as a test chamber for leakage detection of masks and face masks, and can also be used as an ordinary test chamber.

Description

Mask and protective mask leakage test chamber

technical field

The invention relates to a test chamber, in particular to a cycle-adjustable small-scale test chamber for performing leakage tests on masks and protective masks.

Background technique

Masks and protective masks are commonly used and very important disease prevention, epidemic prevention, and protective articles in social life, especially when major disasters such as earthquakes, floods, and infectious diseases (such as SARS) are popular, they are even more important. The quality of masks and protective masks mainly depends on their filtration efficiency, so it is very important to test the leakage of masks and protective masks. In the leakage test of masks and protective masks, there must be a certain space for the test personnel to complete the prescribed actions in this space and conduct the leakage test of masks and protective masks. Therefore, it is necessary to design a test chamber that can realize the above functions. In the existing leakage detection device, the test chamber has a simple structure, poor sealing performance, and the test gas is directly discharged. Since the gas used in the detection may be toxic and harmful gas, irritating gas, or gas that will cause certain pollution to the atmosphere, Direct discharge will pollute the environment and cause adverse effects on the environment. So it is very important to use these gases as little as possible and make full use of them to the greatest extent. At the same time, because the air inside the sealed testing space is not smooth, the health of the test personnel must also be taken into consideration. With the multi-functionality and flexibility of the instrument, and considering the humanization and environmental protection, the above contradictions are becoming more and more obvious.

Contents of the invention

The purpose of the present invention is to provide a well-structured, sealed and recyclable mask and protective mask leakage test chamber for the needs of the mask and protective mask leakage test. In order to achieve the above object, the idea of the present invention is: the present invention adopts a metal structure, which is quite firm, and can be easily disassembled for easy transportation. When the main chamber is closed, the gas inside the main chamber leaks and forms a pressure difference between the auxiliary chamber and the main chamber to achieve better sealing. The present invention adopts the sealing gasket at the joint of the chamber body to realize the sealing effect, which can realize the easy disassembly of the test chamber and ensure good sealing performance at the same time. The present invention uses an embedded structure and a sealing strip at the door openings of the main warehouse and the auxiliary warehouse to realize the sealing of the two warehouse doors. The present invention adopts a gas circulation system, which reduces the usage of detection gas as much as possible and achieves maximum utilization of detection gas, reduces the emission of detection gas, thereby bringing simple structure, small size, low cost of use and environmental protection to the whole device. The advantages. The present invention can also be used as a common test chamber.

According to above-mentioned inventive concept, the present invention adopts following technical scheme:

A leakage test chamber for masks and protective masks, comprising a main chamber and a test gas generating system and a detection system connected thereto, characterized in that: 1) the main chamber is detachably connected to an auxiliary chamber, 2) the The main chamber is connected to a circulation system, which is a semi-circulation system in which part of the experimental gas participates in the circulation and the circulation volume can be adjusted manually.

The side of the above-mentioned main compartment equipped with the main compartment door that can be opened and closed outwards is connected to the side with the opening of the auxiliary compartment, and the front side of the auxiliary compartment has an auxiliary compartment door that can be opened and closed outwards; The remaining three sides and the remaining two sides of the auxiliary warehouse are respectively equipped with observation windows sealed with glass; the top of the auxiliary warehouse has a rectangular opening connected to the air outlet of an air supply device.

The structure of the above-mentioned test gas generation system is: the outlet of an air compressor is connected to the top of the main chamber through a filter and a generator; the structure of the circulation system is: the lower part of the main chamber passes through a pipeline, The first flowmeter, the first filter and the first adjustable circulation pump are connected to the atmosphere, and the other is connected to the test gas inflow pipeline at the top of the main chamber through the second flowmeter and the second adjustable circulation pump; the detection system The structure is: the pipeline drawn from the main compartment is connected to the atmosphere through the first sampling pump, the first photometer and the first filter, and the pipeline drawn from the mask or protective mask to be tested passes through the second sampling pump, the second photometer and the The second filter is connected to atmosphere.

Compared with the prior art, the present invention has the following obvious outstanding substantive features and significant advantages: the test chamber of the device is composed of a main chamber and an auxiliary chamber connected, adopts a gas circulation system, and adopts a sealed structure at the joint, so it is environmentally friendly, The advantage of energy saving; this device has the advantage of good sealing; this device can adjust the circulation degree of the circulatory system so that the concentration of carbon dioxide in the test chamber is not too high to affect the health of the testing personnel, and it can also save the manufactured gas, thereby reducing costs and Pollution of the air as little as possible; the device is small in size, easy to disassemble and suitable for handling and transportation. It can be used not only as a test chamber for leak detection of masks and masks, but also as an ordinary test chamber.

Description of drawings

Figure 1 is the system diagram of the test chamber

Figure 2 Schematic diagram of the main warehouse

Figure 3 is a schematic diagram of the auxiliary warehouse

Detailed ways

A preferred embodiment of the present invention is described in detail as follows in conjunction with accompanying drawing:

Referring to Fig. 1, the leakage test chamber of the mask and the protective mask includes a main chamber and a test gas generating system and a detection system connected thereto, the main chamber 5 and an auxiliary chamber 17 can be detached and sealed; the main chamber 5 is connected to a circulation system, the The circulation system is a semi-circulation system in which part of the test gas participates in the circulation and the circulation volume can be adjusted manually.

Referring to Fig. 1, Fig. 2 and Fig. 3, the main warehouse 5 and the auxiliary warehouse 17 are both cuboid plate structures. Main warehouse 5 is equipped with the side that can outwardly open and close main warehouse door 18 and is connected with the side that auxiliary warehouse 17 has opening 23, and two warehouses 5,17 joints are filled with sealing strips. The positive side of auxiliary warehouse 17 has the auxiliary warehouse door 27 of outward opening and closing, and sealing strip is housed around it. Observation windows 19, 20, 22, 25, 26 are respectively arranged on the remaining three sides of the main warehouse 5 and the remaining two sides of the auxiliary warehouse; Glass, a rubber sealing strip is installed between the glass and the plate. A rectangular opening 24 is arranged on the top of the auxiliary storehouse 17 to connect to the air outlet of an air supply device 4 .

Referring to Fig. 1, the structure of the above-mentioned test gas generation system is: the outlet of an air compressor 1 is connected to the top of the main chamber 5 through a filter 2 and a generator 3; the structure of the circulation system is: the The lower part of the main chamber 5 is connected to the atmosphere through the first flow meter 8, the first filter 9 and the first adjustable circulation pump 10 through the pipeline, and the other path is connected to the atmosphere through the second flow meter 7 and the second adjustable circulation pump 6. The test gas flowing into the pipeline through the top of the main chamber 5; The lead-out pipeline in the measuring mask or protective mask is connected to atmospheric air through the second sampling pump 14 , the second photometer 15 and the second filter 16 .

The above-mentioned generator 3 adopts a TSI9306 generator, and the photometers 12 and 15 adopt a TSI8587A photometer.

working principle

The main chamber 5 is used as the test chamber to carry out the leakage test of masks and protective masks. The auxiliary warehouse 17 is used as a transitional warehouse, and passes through the auxiliary warehouse before entering the main warehouse, and then enters the main warehouse. The air supply device 4 on the top of the auxiliary warehouse 17 inputs gas to increase the internal pressure of the auxiliary warehouse, and at the same time plays a role in sealing the main warehouse door and preventing the internal test gas from leaking to the external environment when the main warehouse is opened.

During the test, the test gas enters from the opening on the top of the main chamber and is discharged from the opening on the lower part. Test personnel stand in the main compartment and use masks or protective masks to conduct tests.

During the test, the test personnel enter the main warehouse through the auxiliary warehouse, and the air supply device 4 on the top of the auxiliary warehouse applies positive pressure to prevent gas leakage inside the main warehouse.

The air compressor 1 inputs the compressed air, passes through the filter 2 and then enters the generator 3 to generate the particulate test gas that meets the requirements. The generated particle test gas enters the main chamber 5 through the pipeline for experimentation, and at the same time, the gas flows to the two flowmeters 7 and 8 through the holes in the lower part of the main chamber 5, and the flow in the two pipes can be monitored by the flowmeter. One path of gas is discharged to the atmosphere through filter 9 and vacuum pump 10, and the other path of gas is delivered to the air inlet of the main chamber through circulation pump 6. After the concentration in the main chamber of the test reaches a stable level, the test is carried out. Two sets of data are collected during the test, one set of data is the concentration of the particles to be tested inside the main chamber of the test, and the other set of data is the concentration of particles inside the mask or protective mask to be tested. These two sets of data pass through the two pipelines on the main chamber Two paths of gas are drawn from the main chamber and the mask or protective mask to be tested in the main chamber respectively, pass through sampling pumps 13, 14, photometers 12, 15 and filters 11, 16 respectively, and finally discharge to the atmosphere. Two groups of gas concentrations passing through the photometers 12 and 15 can be detected by the photometer to obtain two sets of different concentration values, and the leakage of the mask or protective mask to be tested can be obtained by substituting into the formula for calculation. When it is necessary to adjust the circulation volume, it can be realized by adjusting the pumps 6 and 10, and at the same time cooperate with the observation flow meters 7 and 8 to realize the control.

Claims (3)

1, a kind of respirator and protective mask leakage test chamber, comprise a main chamber (5) and the test gas generating system and detection system connected thereto, specific features are: 1), the main warehouse (5) is detachably sealed with an auxiliary warehouse (17); 2) The main chamber (5) is connected to a circulation system, which is a semi-circulation system in which part of the test gas participates in the circulation and the circulation volume can be adjusted manually. 2. The mask and protective mask leakage test chamber according to claim 1, characterized in that the main chamber (5) is equipped with one side of the main chamber door (18) that can be opened and closed outwards and the auxiliary chamber ( 17) One side with the opening (23) is connected, and the front side of the auxiliary warehouse (17) has an auxiliary warehouse door (27) that opens and closes outwards; the remaining two sides of the main warehouse (5) are respectively sealed. Glass observation windows (19, 20, 22, 25, 26) are installed; a rectangular opening (24) is arranged on the top of the auxiliary storehouse (17) to connect the air outlet of an air supply device (4). 3. The mask and protective mask leakage test chamber according to claim 1 or 2, characterized in that the structure of the test gas generating system is: the outlet of an air compressor (1) passes through a filter (2) and a generator (3) connected to the top of the main chamber (5); the structure of the circulation system is: the lower part of the main chamber (5) passes through the pipeline, all the way through the first flow meter (8), the second One filter (9) and the first adjustable circulation pump (10) are connected to the atmosphere, and the other path is connected to the top of the main chamber (5) through the second flow meter (7) and the second adjustable circulation pump (6) The gas flows into the pipeline; the structure of the detection system is: the pipeline is drawn out from the main chamber (5) and connected to the atmosphere through the first sampling pump (13), the first photometer (12) and the first filter (11), and the The lead-out pipeline in the mask to be tested or the protective mask is connected to the atmosphere through the second sampling pump (14), the second photometer (15) and the second filter (16).

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