A gas mask protection time testing device

Abstract

The present invention relates to the technical field of gas mask testing, and in particular to a gas mask protection time testing device, comprising a test box and a testing mechanism. The testing mechanism comprises a first chamber, a transfer chamber, and a second chamber, wherein the first chamber is connected to the transfer chamber via a first piston rod. The second chamber is connected to the transfer chamber via a second piston rod. Both the first chamber and the second chamber are provided with a filter element and a detection element; the detection element is used to detect whether the gas filtered by the filter element is toxic. A gas mask protection time testing device of the present invention utilizes the cooperation of the first piston rod and the second piston rod to link the first chamber and the second chamber, which can not only test two filters at the same time, thereby improving the test efficiency, but also can simulate the dynamic process of inhalation and exhalation when a human body wears a gas mask, thereby improving the authenticity and reliability of the test.

Description

Technical Field

[0001] The invention relates to the technical field of gas mask testing, in particular to a gas mask protection time testing device. Background Art

[0002] During the production process, enterprises will inevitably encounter various toxic gas leaks. Some enterprises even carry out production activities directly in such dangerous environments. These toxic gases directly threaten the lives and property safety of enterprise personnel.

[0003] To effectively address these risks, gas masks have become a key piece of equipment for ensuring personnel safety. Filters, as key components of gas masks, are a core indicator of filter quality, and their protection time is a key indicator. Therefore, after production, filters must be tested for their protection time.

[0004] Existing testing devices generally use a continuous airflow method to ventilate the filter element and infer the protection time by measuring the toxic gas content in the exhaust gas. However, this testing method can only perform static simulations and is highly mechanical, which is far from the actual wearable conditions of the human body. As a result, the protection time obtained from the test is inaccurate. Summary of the Invention

[0005] The present invention provides a gas mask protection time testing device to solve the problem that the existing testing device can only perform static simulation and has strong mechanical properties, which is far from the actual usage during human wearing, resulting in inaccurate protection time obtained from the test.

[0006] A gas mask protection time testing device of the present invention adopts the following technical scheme: a gas mask protection time testing device is used to test the protection time of a gas mask filter element, comprising a test box and a test mechanism; the test mechanism is installed in the test box; the test mechanism comprises a first chamber, a transfer chamber and a second chamber, the first chamber is connected to the transfer chamber through a first piston rod, the first piston rod is respectively slidably sealed with the first chamber and the transfer chamber, the second chamber is connected to the transfer chamber through a second piston rod, the second piston rod is respectively slidably sealed with the second chamber and the transfer chamber, a driving member is provided in the transfer chamber, the driving member is used to drive the first piston rod or the second piston rod to move; a filter element and a detection element are both provided in the first chamber and the second chamber; the detection element is used to detect whether the gas filtered by the filter element is toxic.

[0007] Furthermore, a detection plate is provided in each of the first chamber and the second chamber, and the detection plate is elastic; the detection plate is used to seal the first chamber and the second chamber; the detection element is installed on the detection plate and is located on the side of the detection plate close to the filter element; the detection plate has a first state and a second state, and when in the first state, the detection plate abuts against the filter element corresponding to it; when in the second state, the detection plate is detached from the filter element corresponding to it.

[0008] Furthermore, a cylindrical mounting opening is provided on each of the first chamber and the second chamber, the filter elements are provided in a one-to-one correspondence with the mounting openings, and each filter element is screwed to its corresponding mounting opening.

[0009] Furthermore, a vibration plate is respectively provided in the first chamber and the second chamber. The vibration plate is annular and elastic. The vibration plate is located on the side of the detection plate away from the filter element and is coaxially arranged with the installation port. In the initial state, the vibration plate abuts against the detection plate; the outer ring of the vibration plate is fixedly installed in the corresponding first chamber or the second chamber, and the diameter of the outer ring of the vibration plate is larger than the diameter of the installation port, and the diameter of the inner ring of the vibration plate is smaller than the diameter of the installation port.

[0010] Furthermore, the detection element is an electrochemical sensor, a test system is provided on the test box, the detection element is electrically connected to the test system, and the detection element can feed back the electrical signal detected by it to the test system.

[0011] Furthermore, the transfer chamber is a U-shaped structure, and the first chamber and the second chamber are both fixedly connected to the transfer chamber.

[0012] Furthermore, the driving member is a hydraulic telescopic cylinder, and the first piston rod or the second piston rod is fixedly installed at the output end of the driving member.

[0013] Furthermore, a mounting plate is fixedly provided in the transfer chamber, the driving member is mounted on the mounting plate, and a flow hole is provided in the mounting plate.

[0014] Furthermore, the test box includes a main box body and a cover plate, the test mechanism is installed in the main box body, a through opening is opened on the main box body, and the cover plate is slidably installed on the main box body so that the through opening can be opened or closed.

[0015] Furthermore, an observation window is provided on the cover plate.

[0016] The beneficial effects of the present invention are: a gas mask protection time testing device of the present invention utilizes the first piston rod and the second piston rod to cooperate to link the first chamber and the second chamber, which can not only simultaneously install two filter elements to be tested in the first chamber and the second chamber respectively, and test the two filter elements in one test, thereby improving the test efficiency, but also can simulate the dynamic process of inhalation and exhalation when a human body wears a gas mask, restore the actual usage scenario, and improve the authenticity and reliability of the protection time test of the gas mask filter element; and during the detection process, the interior of the test box is not connected to the outside world, which can prevent the leakage of toxic gas and make the detection safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the overall structure of an embodiment of a gas mask protection time testing device of the present invention;

[0019] Figure 2 A front view of the overall structure of an embodiment of a gas mask protection time testing device of the present invention;

[0020] Figure 3 A cross-sectional view of the overall structure of an embodiment of a gas mask protection time testing device of the present invention;

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 A cross-sectional view of a filter element of an embodiment of a gas mask protection time testing device of the present invention installed on a testing mechanism;

[0023] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0024] Figure 7 for Figure 5 Enlarged view of point C in the middle.

[0025] In the figure: 100, test box; 110, main box body; 120, cover plate; 121, observation window; 200, test mechanism; 210, first chamber; 220, transfer chamber; 221, mounting plate; 230, second chamber; 240, first piston rod; 250, second piston rod; 260, driving member; 270, detection plate; 280, vibration plate; 300, filter element; 400, clamping mechanism. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] An embodiment of a gas mask protection time testing device of the present invention is as follows Figures 1 to 7 shown.

[0028] A gas mask protection time testing device is used to test the protection time of a gas mask filter element 300, and includes a test box 100 and a test mechanism 200. The test mechanism 200 is installed in the test box 100. The test mechanism 200 includes a first chamber 210, a transfer chamber 220, and a second chamber 230. The first chamber 210 is connected to the transfer chamber 220 via a first piston rod 240. The two ends of the first piston rod 240 are respectively slidably sealed with the first chamber 210 and the transfer chamber 220. The second chamber 230 is connected to the transfer chamber 220 via a second piston rod 250. The two ends of the second piston rod 250 are respectively slidably sealed with the second chamber 230 and the transfer chamber 220. Both the first piston rod 240 and the second piston rod 250 are bidirectional piston rods. A driving member 260 is provided in the transfer chamber 220 for driving the first piston rod 240 or the second piston rod 250 to move. A filter element 300 and a detection element are provided in each of the first chamber 210 and the second chamber 230. The detection element is used to detect whether the gas filtered by the filter element 300 is toxic. The detection element is not shown in the drawings of the specification.

[0029] Specifically, a cylindrical mounting opening is provided on the first chamber 210 and the second chamber 230 , and the filter elements 300 are provided in a one-to-one correspondence with the mounting openings, and each filter element 300 is screwed to its corresponding mounting opening.

[0030] Furthermore, the first chamber 210 and the second chamber 230 are both arranged in the vertical direction, the transfer chamber 220 is a U-shaped structure, and the first chamber 210 and the second chamber 230 are both fixedly connected to the transfer chamber 220. The installation openings of the first chamber 210 and the second chamber 230 are both arranged upward.

[0031] The test box 100 includes a main box body 110 and a cover plate 120. The test mechanism 200 is installed in the main box body 110. A through opening is opened on the main box body 110. The cover plate 120 is slidably installed on the main box body 110 so that the through opening can be opened or closed.

[0032] When the cover 120 is away from the opening, the test box 100 is connected to the outside, which facilitates the installation and removal of the filter element 300. When the cover 120 blocks the opening, the test box 100 is closed to prevent the toxic gas from leaking out.

[0033] Furthermore, an observation window 121 is provided on the cover plate 120 to facilitate real-time observation by operators.

[0034] This embodiment comprises a first chamber 210, a transfer chamber 220, and a second chamber 230. During testing, the two filter elements 300 to be tested are first installed on the mounting openings of the first chamber 210 and the second chamber 230, respectively. Toxic gas is then introduced into the test chamber 100, and the driver 260 is activated, driving the first piston rod 240. As the driver 260 drives the first piston rod 240 within the first chamber 210 away from the filter element 300, the toxic gas is filtered by the filter element 300 and drawn into the first chamber 210. When the filter element 300 is functioning properly, the filtered gas is non-toxic. This process simulates the inhalation action of a person wearing a gas mask.

[0035] Because the other end of the first piston rod 240 is connected to the transfer chamber 220, the gas in the transfer chamber 220 is pressurized, forcing the second piston rod 250, also in the transfer chamber 220, to move. This causes the second piston rod 250 to move within the second chamber 230 toward the side closer to the filter element 300, causing the gas in the second chamber 230 to be discharged into the test box 100 through the filter element 300. This process can simulate the exhalation action of a person wearing a gas mask.

[0036] The driver 260 is then activated again, driving the first piston rod 240 within the first chamber 210 toward the filter element 300. This causes the gas previously filtered by the filter element 300 to be discharged into the test chamber 100. This process simulates the exhalation of a person wearing a gas mask. Similarly, the first piston rod 240 pulls the second piston rod 250 through the adapter chamber 220, causing it to move within the second chamber 230 away from the filter element 300. The toxic gas is filtered by the filter element 300 and drawn into the second chamber 230. The filtered toxic gas is then rendered non-toxic. This process simulates the inhalation of a person wearing a gas mask. This process repeats until the detector detects that the gas filtered by the filter element 300 is toxic, indicating that the filter element 300 has failed, and the protection time of the filter element 300 is determined.

[0037] That is, this embodiment utilizes the cooperation of the first piston rod 240 and the second piston rod 250 to link the first chamber 210 and the second chamber 230. Not only can the two filter elements 300 to be tested be installed in the first chamber 210 and the second chamber 230 respectively at the same time, and the two filter elements 300 can be tested in one test, thereby improving the test efficiency, but it can also simulate the dynamic process of inhalation and exhalation when a person wears a gas mask, restore the actual usage scenario, and improve the authenticity and reliability of the protection time test of the filter element 300 of the gas mask. In addition, during the detection process, the interior of the test box 100 is not connected to the outside world, which can prevent the leakage of toxic gases and make the detection safer.

[0038] In a further embodiment, the driving member 260 is a hydraulic telescopic cylinder, and the first piston rod 240 or the second piston rod 250 is fixedly installed at the output end of the driving member 260 .

[0039] Specifically, a mounting plate 221 is fixedly provided in the adapter chamber 220 , and the driving member 260 is mounted on the mounting plate 221 . The mounting plate 221 is provided with flow holes to allow gas to flow.

[0040] In a further embodiment, a resilient detection plate 270 is disposed within each of the first chamber 210 and the second chamber 230. The detection plate 270 is used to seal the first chamber 210 and the second chamber 230. A detection element is mounted on the detection plate 270 and is located on a side of the detection plate 270 proximal to the filter element 300. The detection element is conventional technology, specifically an electrochemical sensor. A test system is disposed on the test box 100, and the detection element is electrically connected to the test system, capable of feeding back the electrical signals it detects to the test system.

[0041] The detection plate 270 has a first state and a second state. In the first state, the detection plate 270 is in contact with the corresponding filter element 300. In the second state, the detection plate 270 is separated from the corresponding filter element 300, and the detection plate 270 is deformed to convexly face the side of the corresponding first chamber 210 or second chamber 230.

[0042] Specifically, bosses are provided in both the first chamber 210 and the second chamber 230 , and the end of the detection plate 270 is fixedly connected to the lower end of the bosses.

[0043] See also Figure 3 and Figure 4 As shown, the detection plates 270 are in a natural state, with both detection plates 270 being straight. The filter elements 300 have not yet been installed. Before testing, the filter elements 300 are installed and the detection plates 270 are brought into contact with their corresponding filter elements 300. At this point, the detection plates 270 are in the first state.

[0044] Alternatively, see Figure 6 As shown, by making the length of the threaded section on the filter element 300 greater than the length of the threaded section in the first chamber 210 and the second chamber 230, and after the filter element 300 abuts against the detection plate 270, the filter element 300 is further moved downward, and the detection plate 270 is deformed toward the side of the first chamber 210 or the second chamber 230 corresponding to it.

[0045] Then, the driving member 260 is started, and the first piston rod 240 is first moved in the first chamber 210 toward the side close to the filter element 300. Under the linkage action of the first piston rod 240 and the second piston rod 250, the second piston rod 250 will separate the detection plate 270 in the second chamber 230 from the filter element 300, and the detection plate 270 is deformed and convex toward the side of the second chamber 230. Figure 7 At this time, the detection board 270 is in the second state.

[0046] During testing, the test box 100 is closed, and toxic gas is then introduced into the test box 100. The supply is stopped after a certain pressure is formed inside the test box 100. The driving member 260 is then activated to pull the first piston rod 240 to move in the first chamber 210 away from the filter element 300. At this time, the detection plate 270 in the first chamber 210 will deform and bulge toward the side of the first piston rod 240 under the action of negative pressure, and will be separated from the corresponding filter element 300. The toxic gas will be filtered by the filter element 300 and then drawn into the deformed area of the detection plate 270, simulating the action of a person inhaling when wearing a gas mask.

[0047] Since the other end of the first piston rod 240 is connected to the transfer chamber 220, the gas in the transfer chamber 220 will be pressurized, and the second piston rod 250, which is also in the transfer chamber 220, will move, causing the second piston rod 250 to move in the second chamber 230 toward the side close to the filter element 300. Therefore, the detection plate 270 in the second chamber 230 will reset and discharge the gas in the reverse direction, simulating the action of a human body exhaling when wearing a gas mask.

[0048] When the driver 260 drives the first piston rod 240 to move within the first chamber 210 toward the side closer to the filter element 300, the detection plate 270 within the first chamber 210 resets, expelling the gas filtered by the filter element 300 in the reverse direction, simulating the exhalation of a person wearing a gas mask. Similarly, the first piston rod 240 pulls the second piston rod 250 through the adapter chamber 220, causing it to move within the second chamber 230 away from the filter element 300. Under the action of negative pressure, the detection plate 270 within the second chamber 230 deforms and bulges toward the second piston rod 250, disengaging from the corresponding filter element 300. Toxic gases, filtered by the filter element 300, are drawn into the deformed area of the detection plate 270, simulating the inhalation of a person wearing a gas mask.

[0049] This embodiment prevents toxic gases from entering the first chamber 210 and the second chamber 230 by providing a relatively stable detection area for the gas filtered by the filter element 300. Furthermore, by abutting the detection plate 270 against the filter element 300 and further deforming the detection plate 270 toward the corresponding first chamber 210 or second chamber 230, the gas within the deformed area of the detection plate 270 is completely discharged after the detection plate 270 is reset, preventing residual gas from misleading the test results. Specifically, when the filter element 300 fails, the gas that enters the deformed area of the detection plate 270 through the filter element 300 is toxic and is detected by the detection element. If the toxic gas within the deformed area of the detection plate 270 cannot be completely discharged during testing after a new filter element 300 is replaced, the residual toxic gas will continue to trigger the detection element during the next test, resulting in a misjudgment.

[0050] In another possible embodiment, a vibration plate 280 is further provided in the first chamber 210 and the second chamber 230 respectively. The vibration plate 280 is annular and elastic. The vibration plate 280 is located on the side of the detection plate 270 away from the filter element 300 and is coaxially arranged with the installation port. In the initial state, the vibration plate 280 is in contact with the detection plate 270.

[0051] The two radial ends of the vibration plate 280 are referred to as the inner ring and outer ring, respectively. The inner ring is located on the radial side of the outer ring closer to the central axis of the vibration plate 280. The outer ring of the vibration plate 280 is fixedly mounted within the corresponding first cavity 210 or second cavity 230. The diameter of the outer ring of the vibration plate 280 is larger than the diameter of the mounting opening, while the diameter of the inner ring of the vibration plate 280 is smaller than the diameter of the mounting opening. In other words, the inner ring of the vibration plate 280 extends radially into the mounting opening.

[0052] In this embodiment, a vibration plate 280 is provided. Figure 6 As shown, when the detection plate 270 deforms toward the corresponding first chamber 210 or second chamber 230, the deformation of the detection plate 270 drives the vibration plate 280 to move synchronously, causing the vibration plate 280 to deform. When the first piston rod 240 or the second piston rod 250 draws suction, causing the detection plate 270 to further deform and separate from the filter element 300, the degree of deformation of the vibration plate 280 will further increase.

[0053] When the detection plate 270 is reset, the vibration plate 280 will be reset under the action of its own elasticity. Since the diameter of the inner ring of the vibration plate 280 is smaller than the diameter of the installation port, the reset of the vibration plate 280 will generate circumferential vibration on the filter element 300 installed on the installation port, simulating the vibration that may be generated by the human body when wearing a gas mask (walking, running), and the test situation is more comprehensive and more in line with reality.

[0054] In another possible embodiment, a clamping mechanism 400 is further provided within the test box 100 and is located directly above the installation opening. The clamping mechanism 400 holds a plurality of filter elements 300 to be tested and is capable of installing and replacing the filter elements 300. The clamping mechanism 400 is conventional technology.

[0055] By providing the clamping mechanism 400, the machine can be stopped for replacement after all the filters 300 have been tested. Of course, the toxic gas can also be recovered after testing two filters 300, and then the machine can be stopped to replace new filters 300. However, as a preference, providing the clamping mechanism 400 can further improve the detection efficiency.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas mask protection time testing device for testing the protection time of a gas mask filter element, characterized in that: The invention comprises a test box and a test mechanism; the test mechanism is installed in the test box; the test mechanism comprises a first chamber, a transfer chamber and a second chamber, the first chamber is connected to the transfer chamber through a first piston rod, the first piston rod is respectively slidably sealed with the first chamber and the transfer chamber, the second chamber is connected to the transfer chamber through a second piston rod, the second piston rod is respectively slidably sealed with the second chamber and the transfer chamber, a driving member is provided in the transfer chamber, the driving member is used to drive the first piston rod or the second piston rod to move; a filter and a detection member are both provided in the first chamber and the second chamber; the detection member is used to Used to detect whether the gas filtered by the filter element is toxic; a detection plate is provided in both the first chamber and the second chamber, and the detection plate is elastic; the detection plate is used to seal the first chamber and the second chamber; the detection member is installed on the detection plate and is located on the side of the detection plate close to the filter element; the detection plate has a first state and a second state, when in the first state, the detection plate abuts against the filter element corresponding to it; when in the second state, the detection plate is separated from the filter element corresponding to it; a mounting plate is fixedly provided in the transfer chamber, the driving member is installed on the mounting plate, and a flow hole is provided on the mounting plate.

2. A gas mask protection time testing device according to claim 1, characterized in that: The first chamber and the second chamber are both provided with cylindrical mounting openings, the filter elements are arranged in one-to-one correspondence with the mounting openings, and each filter element is screwed to the corresponding mounting opening.

3. A gas mask protection time testing device according to claim 2, characterized in that: A vibration plate is also provided in the first chamber and the second chamber respectively. The vibration plate is annular and elastic. The vibration plate is located on the side of the detection plate away from the filter element and is coaxial with the installation port. In the initial state, the vibration plate abuts against the detection plate; the outer ring of the vibration plate is fixedly installed in the corresponding first chamber or the second chamber, and the diameter of the outer ring of the vibration plate is larger than the diameter of the installation port, and the diameter of the inner ring of the vibration plate is smaller than the diameter of the installation port.

4. A gas mask protection time testing device according to claim 1, characterized in that: The detection element is an electrochemical sensor. A test system is provided on the test box. The detection element is electrically connected to the test system. The detection element can feed back the electrical signal it detects to the test system.

5. A gas mask protection time testing device according to claim 1, characterized in that: The transfer chamber is a U-shaped structure, and the first chamber and the second chamber are both fixedly connected to the transfer chamber.

6. A gas mask protection time testing device according to claim 1, characterized in that: The driving member is a hydraulic telescopic cylinder, and the first piston rod or the second piston rod is fixedly installed at the output end of the driving member.

7. A gas mask protection time testing device according to claim 1, characterized in that: The test box includes a main box body and a cover plate. The test mechanism is installed in the main box body. A through opening is opened on the main box body. The cover plate is slidably installed on the main box body so that the through opening can be opened or closed.

8. A gas mask protection time testing device according to claim 7, characterized in that: An observation window is provided on the cover plate.

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