Protection time testing device for gas mask

Abstract

The invention relates to the technical field of gas mask testing, in particular to a gas mask protection time testing device which comprises a testing box and a testing mechanism. The testing mechanism comprises a first chamber, a switching chamber and a second chamber. The first chamber is connected with the switching chamber through a first piston rod. And the second chamber is connected with the switching chamber through a second piston rod. The first cavity and the second cavity are each provided with a filtering piece and a detecting piece. The detection part is used for detecting whether the gas filtered by the filtering part is toxic or not. According to the gas mask protection time testing device, the first piston rod and the second piston rod are matched, the first cavity and the second cavity are linked, two filtering pieces can be tested at the same time, the testing efficiency is improved, the dynamic process of inspiration and expiration when a human body wears a gas mask can be simulated, and the testing efficiency is improved. And the authenticity and reliability of the test are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas mask testing, and particularly to a device for testing the protection time of a gas mask. Background Art

[0002] During the production operation process of enterprises, it is inevitable to encounter various situations of toxic gas leakage. Even some enterprises directly carry out production activities in such a dangerous environment. These toxic gases directly threaten the lives and property safety of enterprise personnel.

[0003] In order to effectively cope with these risks, gas masks have become one of the key equipment to ensure personnel safety. And the filter element, as the main component of the gas mask, its protection time is even the core index to measure the quality of the filter element. Therefore, after production, it is necessary to test the protection time of the filter element.

[0004] The existing testing devices generally adopt a continuous air intake method to ventilate the filter element, and infer the protection time by detecting the content of toxic gases in the discharged gas. However, this testing method can only perform static simulation, and is highly mechanical, far from the actual use situation during human wearing, resulting in inaccurate protection time obtained from the test. Summary of the Invention

[0005] The present invention provides a device for testing the protection time of a gas mask to solve the problem that the existing testing devices can only perform static simulation, are highly mechanical, far from the actual use situation during human wearing, and result in inaccurate protection time obtained from the test.

[0006] The device for testing the protection time of a gas mask of the present invention adopts the following technical solution: A device for testing the protection time of a gas mask for testing the protection time of the filter element of a gas mask, including a test chamber and a test mechanism; the test mechanism is installed in the test chamber; the test mechanism includes 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 slidably sealed with the first chamber and the transfer chamber respectively. The second chamber is connected to the transfer chamber through a second piston rod. The second piston rod is slidably sealed with the second chamber and the transfer chamber respectively. A driving member is arranged in the transfer chamber for driving the first piston rod or the second piston rod to move; filter elements and detection elements are arranged in both the first chamber and the second chamber; the detection element is used for detecting whether the gas filtered by the filter element is toxic.

[0007] Further, detection plates are provided in both the first chamber and the second chamber. The detection plates are elastic; the detection plates are used to seal the first chamber and the second chamber; the detection members are installed on the detection plates and are located on the side of the detection plates close to the filter elements; the detection plates have a first state and a second state. When in the first state, the detection plates are in contact with the corresponding filter elements; when in the second state, the detection plates are separated from the corresponding filter elements.

[0008] Further, cylindrical mounting openings are formed in both the first chamber and the second chamber. The filter elements are provided in one-to-one correspondence with the mounting openings, and each filter element is screwed to the corresponding mounting opening.

[0009] Further, vibration plates are respectively provided in the first chamber and the second chamber. The vibration plates are annular and elastic. The vibration plates are located on the side of the detection plates away from the filter elements and are coaxially arranged with the mounting openings. In the initial state, the vibration plates are in contact with the detection plates; the outer rings of the vibration plates are fixedly installed in the corresponding first chamber or second chamber, and the diameter of the outer rings of the vibration plates is larger than the diameter of the mounting openings, and the diameter of the inner rings of the vibration plates is smaller than the diameter of the mounting openings.

[0010] Further, the detection member is an electrochemical sensor. A test system is provided on the test box, and the detection member is electrically connected to the test system. The detection member can feedback the detected electrical signal to the test system.

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

[0012] Further, 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] Further, a mounting plate is fixedly provided in the transfer chamber. The driving member is installed on the mounting plate, and a circulation hole is formed in the mounting plate.

[0014] Further, 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 formed in 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] Further, an observation window is provided on the cover plate.

[0016] The beneficial effects of the present invention are as follows: 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. It can not only install two filter elements to be tested in the first chamber and the second chamber respectively at the same time, test the two filter elements in one test, improve the test efficiency, but also simulate the dynamic processes of inhalation and exhalation when a human wears a gas mask, restore the actual use scenario, improve the authenticity and reliability of the protection time test of the filter element of the gas mask, and during the detection process, the inside of the test box is not connected to the outside, which can prevent the leakage of toxic gases and make the detection safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a gas mask protection time testing device of the present invention; Figure 2 It is a front view of the overall structure of an embodiment of a gas mask protection time testing device of the present invention; Figure 3 It is a cross-sectional view of the overall structure of an embodiment of a gas mask protection time testing device of the present invention; Figure 4 For Figure 3 the enlarged view at A in Figure 5 It is a cross-sectional view of the filter element installed on the test mechanism in an embodiment of a gas mask protection time testing device of the present invention; Figure 6 For Figure 5 the enlarged view at B in Figure 7 For Figure 5 the enlarged view at C in

[0019] 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 piece; 300, filter element; 400, clamping mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] An embodiment of a test device for the protection time of a gas mask according to the present invention is as Figures 1 to 7 shown.

[0022] A test device for the protection time of a gas mask is used to test the protection time of the filter element 300 of the gas mask, 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 through a first piston rod 240. Both ends of the first piston rod 240 are slidably sealed with the first chamber 210 and the transfer chamber 220 respectively. The second chamber 230 is connected to the transfer chamber 220 through a second piston rod 250. Both ends of the second piston rod 250 are slidably sealed with the second chamber 230 and the transfer chamber 220 respectively. Both the first piston rod 240 and the second piston rod 250 are two-way piston rods. A driving member 260 is arranged in the transfer chamber 220, and the driving member 260 is used to drive the first piston rod 240 or the second piston rod 250 to move. Filter elements 300 and detection elements are arranged in both 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 attached drawings of the specification.

[0023] Specifically, cylindrical installation openings are provided on both the first chamber 210 and the second chamber 230. The filter elements 300 are arranged in one-to-one correspondence with the installation openings, and each filter element 300 is screwed to its corresponding installation opening.

[0024] Furthermore, both the first chamber 210 and the second chamber 230 are arranged in the vertical direction. The transfer chamber 220 is of a U-shaped structure, and both the first chamber 210 and the second chamber 230 are fixedly connected to the transfer chamber 220. The installation openings of the first chamber 210 and the second chamber 230 are both arranged upward.

[0025] 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 provided on the main box body 110, and the cover plate 120 is slidably installed on the main box body 110 so that the through opening can be opened or closed.

[0026] When the cover plate 120 leaves the through - opening, the test chamber 100 is in communication with the outside world at this time, which facilitates the installation and disassembly of the filter element 300. When the cover plate 120 seals the through - opening, the test chamber 100 is closed at this time to prevent the leakage of toxic gases.

[0027] Furthermore, an observation window 121 is provided on the cover plate 120, which is convenient for the operator to observe in real time.

[0028] In this embodiment, by providing the first chamber 210, the transfer chamber 220 and the second chamber 230, during the test, first, the two filter elements 300 to be tested are respectively installed on the installation openings of the first chamber 210 and the second chamber 230. Then, toxic gas is introduced into the test chamber 100, and the driving member 260 is started. The driving member 260 drives the first piston rod 240 to move. When the driving member 260 drives the first piston rod 240 to move away from the filter element 300 in the first chamber 210, the toxic gas will be filtered by the filter element 300 and then pumped into one side of the first chamber 210. When the filter element 300 can work normally, the filtered gas is non - toxic. And this process can simulate the inhalation action of a human body when wearing a gas mask.

[0029] 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 this will cause the second piston rod 250 also in the transfer chamber 220 to move, making the second piston rod 250 move towards the side close to the filter element 300 in the second chamber 230, so that the gas in the second chamber 230 passes through the filter element 300 and is discharged into the test chamber 100. And this process can simulate the exhalation action of a human body when wearing a gas mask.

[0030] Then the driving member 260 is started again to drive the first piston rod 240 to move towards the side close to the filter element 300 in the first chamber 210, so that the gas filtered by the filter element 300 before is discharged into the test chamber 100. This process also simulates the exhalation action of a human body when wearing a gas mask. Similarly, at this time, the first piston rod 240 will pull the second piston rod 250 through the transfer chamber 220, making the second piston rod 250 move away from the side close to the filter element 300 in the second chamber 230, and the toxic gas will be filtered by the filter element 300 and then pumped into the second chamber 230, and the filtered toxic gas is non - toxic. This process can simulate the inhalation action of a human body when wearing a gas mask. This is repeated until the detection member detects that the gas filtered by the filter element 300 is toxic. At this time, the filter element 300 fails, and the protection time of the filter element 300 is obtained.

[0031] That is, in this embodiment, the first piston rod 240 and the second piston rod 250 are cooperated to link the first chamber 210 and the second chamber 230. Not only can two filter elements 300 to be tested be respectively installed in the first chamber 210 and the second chamber 230, and the two filter elements 300 can be tested in one test, improving the test efficiency, but also the dynamic processes of inhalation and exhalation when a human wears a gas mask can be simulated, restoring the actual use scenario, improving the authenticity and reliability of the test on the protection time of the filter element 300 of the gas mask, and during the detection process, the inside of the test chamber 100 is not communicated with the outside, preventing the leakage of toxic gases and making the detection safer.

[0032] 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.

[0033] Specifically, a mounting plate 221 is fixedly arranged in the transfer chamber 220, the driving member 260 is installed on the mounting plate 221, and a circulation hole is formed in the mounting plate 221 to enable gas to flow.

[0034] In a further embodiment, detection plates 270 are arranged in both the first chamber 210 and the second chamber 230, and the detection plates 270 are elastic. The detection plates 270 are used to block the first chamber 210 and the second chamber 230. The detection member is installed on the detection plate 270 and is located on the side of the detection plate 270 close to the filter element 300. The detection member is a prior art, specifically an electrochemical sensor. A test system is arranged on the test chamber 100, and the detection member is electrically connected to the test system, and the detection member can feedback the detected electrical signal to the test system.

[0035] The detection plate 270 has a first state and a second state. When in the first state, the detection plate 270 abuts against the corresponding filter element 300. When in the second state, the detection plate 270 is separated from the corresponding filter element 300, and at this time, the detection plate 270 bulges and deforms toward the side of the corresponding first chamber 210 or second chamber 230.

[0036] Specifically, bosses are arranged 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 boss.

[0037] See Figure 3 and Figure 4 As shown, when the detection plate 270 is in a natural state, both detection plates 270 are straight plates. The filter element 300 has not been installed yet. Before the test, the filter element 300 is installed, and the detection plate 270 abuts against the corresponding filter element 300. At this time, the detection plate 270 is in the first state.

[0038] Or, see Figure 6As shown, by making the length of the threaded section on the filter element 300 greater than the lengths of the threaded sections in the first chamber 210 and the second chamber 230, and after the filter element 300 abuts against the detection plate 270, further moving the filter element 300 downward, causing the detection plate 270 to deform towards the side of the corresponding first chamber 210 or second chamber 230.

[0039] Then start the driving member 260. First, move the first piston rod 240 towards the side close to the filter element 300 in the first chamber 210. Under the linkage effect of the first piston rod 240 and the second piston rod 250, the second piston rod 250 will cause the detection plate 270 inside the second chamber 230 to separate from the corresponding filter element 300, and the detection plate 270 will deform and bulge towards the second chamber 230 side. See Figure 7 As shown. At this time, the detection plate 270 is in the second state.

[0040] When testing, close the test chamber 100, then introduce toxic gas into the test chamber 100, and stop supplying after a certain pressure is formed inside the test chamber 100. Then start the driving member 260 to pull the first piston rod 240 to move away from the filter element 300 in the first chamber 210. At this time, the detection plate 270 in the first chamber 210 will deform and bulge towards the first piston rod 240 side under the action of negative pressure, and separate 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 inhalation action of a human wearing a gas mask.

[0041] 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, prompting the second piston rod 250 also in the transfer chamber 220 to move, causing the second piston rod 250 to move towards the side close to the filter element 300 in the second chamber 230. Therefore, the detection plate 270 in the second chamber 230 will reset and discharge the gas in the reverse direction, simulating the exhalation action of a human wearing a gas mask.

[0042] When the driving member 260 drives the first piston rod 240 to move towards the side close to the filter element 300 in the first chamber 210, at this time, the detection plate 270 in the first chamber 210 resets to discharge the gas filtered by the filter element 300 in the reverse direction, simulating the exhalation action of a human body when wearing a gas mask. Similarly, at this time, the first piston rod 240 will pull the second piston rod 250 through the transfer chamber 220, causing the second piston rod 250 to move towards the side away from the filter element 300 in the second chamber 230. The detection plate 270 in the second chamber 230 will deform and bulge towards the side of the second piston rod 250 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 be drawn into the deformed area of the detection plate 270, simulating the inhalation action of a human body when wearing a gas mask.

[0043] In this embodiment, by providing the detection plate 270, it can prevent toxic gas from entering the interiors of the first chamber 210 and the second chamber 230, providing a relatively stable detection area for the gas filtered by the filter element 300. And making the detection plate 270 abut against the filter element 300, and further causing the detection plate 270 to deform towards the corresponding first chamber 210 or second chamber 230 side, it can ensure that after the detection plate 270 resets, all the gas in the deformed area of the detection plate 270 is discharged, avoiding gas residue and misjudgment of the test result. That is, when the filter element 300 fails, the gas entering the deformed area of the detection plate 270 through the filter element 300 is toxic gas and is detected by the detection member. When a new filter element 300 is replaced for detection, if the toxic gas in the deformed area of the detection plate 270 cannot be completely discharged, then in the next test, the remaining toxic gas will continue to trigger the detection member, resulting in misjudgment.

[0044] In another possible embodiment, vibration pieces 280 are respectively arranged in the first chamber 210 and the second chamber 230. The vibration pieces 280 are annular and elastic. The vibration pieces 280 are located on the side of the detection plate 270 away from the filter element 300 and are coaxially arranged with the mounting opening. In the initial state, the vibration pieces 280 abut against the detection plate 270.

[0045] The two ends along the radial direction of the vibration piece 280 are respectively called the inner ring and the outer ring. The inner ring is located on the side of the outer ring closer to its central axis in the radial direction of the vibration piece 280. The outer ring of the vibration piece 280 is fixedly installed in the corresponding first chamber 210 or second chamber 230, and the diameter of the outer ring of the vibration piece 280 is larger than the diameter of the mounting opening, and the diameter of the inner ring of the vibration piece 280 is smaller than the diameter of the mounting opening. That is, the inner ring of the vibration piece 280 extends into the mounting opening along its radial direction.

[0046] In this embodiment, by providing the vibration pieces 280, see Figure 6As shown, when the detection plate 270 deforms towards the corresponding first chamber 210 or second chamber 230, the deformation of the detection plate 270 will drive the vibrating piece 280 to move synchronously, causing the vibrating piece 280 to deform. When the first piston rod 240 or the second piston rod 250 sucks to further deform the detection plate 270 and separates it from the filter element 300, the degree of deformation of the vibrating piece 280 will further increase at this time.

[0047] When the detection plate 270 resets, the vibrating piece 280 will reset under the action of its own elasticity. Since the diameter of the inner circle of the vibrating piece 280 is smaller than the diameter of the mounting port, the reset of the vibrating piece 280 will generate a circumferential vibration on the filter element 300 installed on the mounting port, simulating the vibrations (walking, running) that may occur when a person wears a gas mask. The test situation is more comprehensive and more in line with the actual situation.

[0048] In another possible embodiment, a clamping mechanism 400 is further provided inside the test box 100. The clamping mechanism 400 is located directly above the mounting port. A plurality of filter elements 300 to be detected are clamped on the clamping mechanism 400, and the clamping mechanism 400 can install and replace the filter elements 300. The clamping mechanism 400 is a prior art.

[0049] By setting the clamping mechanism 400, it is possible to perform shutdown replacement after all the filter elements 300 have been detected. Of course, it is also possible to recover the poisonous gas after detecting two filter elements 300 and then shut down and replace the new filter elements 300. However, as a preference, setting the clamping mechanism 400 can further improve the detection efficiency.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A testing device for the protection time of a gas mask, which is used to test the protection time of the filter element of the gas mask, and is characterized in that: It includes a test chamber and a test mechanism; the test mechanism is installed inside the test chamber; the test mechanism includes 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 slidably sealed with both 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 slidably sealed with both the second chamber and the transfer chamber. A driving member is arranged inside the transfer chamber, and 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 arranged inside both the first chamber and the second chamber; the detection element is used to detect whether the gas filtered by the filter element is toxic.

2. The gas mask protection time testing device according to claim 1, wherein: Detection plates are arranged inside both the first chamber and the second chamber. The detection plates are elastic; the detection plates are used to seal the first chamber and the second chamber; the detection elements are installed on the detection plates and are located on the side of the detection plates close to the filter elements; the detection plates have a first state and a second state. When in the first state, the detection plates are in contact with the corresponding filter elements arranged; when in the second state, the detection plates are separated from the corresponding filter elements arranged.

3. The gas mask protection time testing device according to claim 2, characterized in that: Cylindrical mounting openings are formed on both the first chamber and the second chamber. 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.

4. The anti-gas mask protection time testing device according to claim 3, characterized in that: Vibration plates are respectively arranged inside the first chamber and the second chamber. The vibration plates are annular and elastic. The vibration plates are located on the side of the detection plates far from the filter elements and are coaxially arranged with the mounting openings. In the initial state, the vibration plates are in contact with the detection plates; the outer rings of the vibration plates are fixedly installed inside the corresponding first chamber or second chamber, and the diameter of the outer rings of the vibration plates is larger than the diameter of the mounting openings, and the diameter of the inner rings of the vibration plates is smaller than the diameter of the mounting openings.

5. The anti-gas mask protection time testing device according to claim 1, characterized in that: The detection element is an electrochemical sensor. A test system is arranged on the test chamber. The detection element is electrically connected to the test system, and the detection element can feedback the electrical signal detected by it to the test system.

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

7. The anti-gas mask protection time testing device according to claim 1, wherein: 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.

8. The anti-gas mask protection time testing device according to claim 7, characterized in that: A mounting plate is fixedly arranged inside the transfer chamber. The driving member is installed on the mounting plate, and a through hole is formed on the mounting plate.

9. The anti-gas mask protection time testing device according to claim 1, wherein: The test chamber includes a main box body and a cover plate. The test mechanism is installed inside the main box body. A through opening is formed 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.

10. The anti-gas mask protection time testing device according to claim 9, wherein: An observation window is arranged on the cover plate.

Images