Air tightness tester for self-rescuer

Abstract

The utility model belongs to the technical field of inspection equipment, and particularly relates to a self-rescuer air tightness inspection tester which comprises a barrel, a gland is arranged on the barrel and can be pressed by a pressing beam, one end of the pressing beam is hinged with the barrel, the other end of the pressing beam is provided with channel iron, a screw rod is arranged on the side wall of the barrel and corresponds to the channel iron, one end of the screw rod is hinged with the barrel, and the other end of the screw rod is provided with a nut. The screw rod can be clamped into the channel iron, the other end of the screw rod is provided with a hand wheel, the hand wheel is in threaded connection with the screw rod, and the hand wheel can be screwed deeply along the screw rod so as to press the channel iron; a vertical guide rod is arranged in the center of the top face of the gland, a sleeve is arranged in the middle of the pressing beam, the guide rod penetrates through the sleeve, a pressure protection spring wound on the guide rod is arranged between the sleeve and the gland, and scales are arranged on the guide rod. And through the design of the screw rod and the hand wheel, the pressing force of the pressing beam on the gland can be conveniently adjusted, so that the sealing performance between the gland and the barrel body is ensured. A pressure protection spring is arranged, so that the gland can be automatically bounced when the pressure in the barrel body is too high, and rapid pressure relief is realized.

Description

Technical Field

[0001] The utility model relates to an air tightness inspection instrument for a self-rescuer, belonging to the technical field of inspection equipment. Background Art

[0002] The self-rescuer is a device used to protect breathing in an emergency. Its main function is to prevent poisoning by harmful gases or suffocation due to lack of oxygen when there are accidents such as fire, gas, coal dust explosion, coal and gas outburst, etc. The self-rescuer is small in size, light in weight, and easy to carry. It is a respiratory protection device that personnel entering the mine must carry with them.

[0003] The self-rescuer air tightness test device is a test device for checking the air tightness of the self-rescuer. It can quickly and effectively detect whether the self-rescuer is leaking and conduct air tightness inspection. The principle is to install the self-rescuer into the cavity, cover the gland to achieve air tightness, fill the cavity with positive pressure, and observe the digital pressure display value after stabilization. Under a certain positive pressure, the cavity pressure drop is not greater than the standard value within a certain period of time, which means that the self-rescuer under inspection is qualified for air tightness.

[0004] The existing self-rescuer air tightness test device is prone to loose sealing between the gland and the cylinder after being used for a period of time, and the sealing is difficult to ensure, which affects the test results. In addition, the existing self-rescuer air tightness test device is basically manually pressurized, which is inefficient and labor-intensive. Furthermore, the existing equipment does not have a pressure protection function. If the pressure in the cylinder is too high, it will have an adverse effect on the equipment and the self-rescuer. Utility Model Content

[0005] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is: to provide an air tightness tester for a self-rescuer to solve the above problems.

[0006] The utility model describes an air tightness inspection instrument for a self-rescuer, comprising a cylinder body, a pressure cover being provided on the cylinder body, the pressure cover being able to be pressed down by a pressure beam, one end of the pressure beam being hinged to the cylinder body, the other end of the pressure beam being provided with a slot iron, a screw being provided at a position corresponding to the slot iron on the side wall of the cylinder body, one end of the screw being hinged to the cylinder body, the screw being able to be inserted into the slot iron, the other end of the screw being provided with a hand wheel, the hand wheel being connected to the screw by a thread, and the hand wheel being turned so that the hand wheel can be moved along the screw rod to press down the slot iron; a vertical guide rod is provided at the center of the top surface of the pressure cover, a sleeve is provided in the middle of the pressure beam, the guide rod passes through the sleeve, a pressure protection spring coiled on the guide rod is provided between the sleeve and the pressure cover, and the guide rod is provided with a scale.

[0007] The other end of the pressure beam is compressed by the screw and the hand wheel, and then the gland is compressed. Since the hand wheel can move deeper along the screw when the hand wheel is turned, the compression strength can be adjusted, and the problem of loose sealing between the gland and the cylinder after a period of use will not occur. The pressure protection spring is used to limit the pressure to prevent the pressure in the cylinder from being too high. When the pressure is too high, the pressure protection spring fails, and the gland is bounced up to a certain extent to release the pressure. There is a scale on the guide rod. When tightening the hand wheel, the length of the guide rod protruding from the sleeve can be observed to determine the pre-pressure and avoid the problem of loose compression.

[0008] Preferably, the cylinder is connected to an electric air pump for automatic pressurization.

[0009] Preferably, a sealing ring is provided at the mouth of the cylinder, the contact surface between the sealing ring and the gland is an annular inclined surface, and the bottom of the gland is an inverted cone matched with the sealing ring, so that the contact between the cylinder and the gland is tighter.

[0010] Preferably, a pressure gauge is connected to the side of the cylinder through a pipeline to facilitate pressure monitoring.

[0011] Preferably, a pressure relief valve is provided on the side of the cylinder to check whether the cylinder pressure relief is complete.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. Good sealing: Through the design of the screw and hand wheel, the pressing force of the pressure beam on the gland can be easily adjusted to ensure the sealing between the gland and the cylinder. This design can effectively avoid the problem of inaccurate test results caused by loose sealing after a period of use.

[0014] 2. Pressure protection function: The setting of the pressure protection spring can automatically pop up the pressure cover when the pressure in the cylinder is too high, thereby achieving rapid pressure relief, protecting the equipment and self-rescuer from damage, and improving the safety and reliability of the equipment.

[0015] 3. Observable pre-pressure: The guide rod is scaled, so that when tightening the hand wheel, the length of the guide rod protruding from the sleeve can be easily observed to determine the size of the pre-pressure. This helps to avoid the problem of loose sealing caused by loose compression.

[0016] 4. Automatic pressurization: By connecting an electric air pump, automatic pressurization can be achieved, which greatly improves the inspection efficiency and reduces labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is one of the structural schematic diagrams of the utility model;

[0018] Figure 2 This is the second structural diagram of the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the gland.

[0020] In the figure: 1. Cylinder; 2. Screw; 3. Handwheel; 4. Pressure beam; 41. Channel iron; 5. Guide rod; 6. Sleeve; 7. Pressure protection spring; 8. Pressure cover; 9. Pressure gauge; 10. Pressure relief valve; 11. Air pump. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with specific embodiments.

[0022] However, the description of the present invention is merely an embodiment of structural and even functional description, and the scope of rights of the present invention is not limited by the embodiments described in the text.

[0023] For example, multiple embodiments may have multiple changes and multiple forms, and it should be understood that the scope of rights of the present utility model includes equivalents that can realize the technical idea.

[0024] like Figures 1 to 3 As shown, this embodiment is realized by the following technical scheme: it includes a cylinder 1, a pressure cover 8 is provided on the cylinder 1, the pressure cover 8 can be pressed by a pressure beam 4, one end of the pressure beam 4 is hinged to the cylinder 1, and the other end of the pressure beam 4 is provided with a slot iron 41, and a screw 2 is provided at a position corresponding to the slot iron 41 on the side wall of the cylinder 1, one end of the screw 2 is hinged to the cylinder 1, the screw 2 can be inserted into the slot iron 41, and the other end of the screw 2 is provided with a hand wheel 3, the hand wheel 3 is connected to the screw 2 by a thread, and the hand wheel 3 is turned, and the hand wheel 3 can be moved along the screw 2 to press the slot iron 41, and the clamping force can be adjusted, and there will be no problem of poor sealing between the pressure cover 8 and the cylinder 1 after a period of use.

[0025] A vertical guide rod 5 is provided at the center of the top surface of the gland 8, and a sleeve 6 is provided in the middle of the pressure beam 4. The guide rod 5 passes through the sleeve 6. A pressure protection spring 7 is provided between the sleeve 6 and the gland 8 and is coiled on the guide rod 5. The guide rod 5 has a scale. The pressure protection spring 7 is used to limit the pressure to prevent the pressure in the cylinder 1 from being too high. When the pressure is too high, the pressure protection spring fails, and the gland 8 is bounced up to a certain extent to release the pressure. The guide rod 5 has a scale. When tightening the hand wheel 3, the length of the guide rod 5 protruding from the sleeve 6 can be observed to determine the pre-pressure and avoid the problem of loose compression.

[0026] In this embodiment, a sealing ring is provided at the mouth of the cylinder 1, and the contact surface between the sealing ring and the gland 8 is an annular inclined surface, and the bottom of the gland 8 is an inverted cone that matches the sealing ring.

[0027] In this embodiment, a pressure gauge 9 is connected to the side of the cylinder 1 through a pipeline, the cylinder 1 is connected to an electric air pump 11, and a pressure relief valve 10 is provided on the side of the cylinder 1.

[0028] Before the test, place the instrument in a laboratory at a constant temperature for more than 2 hours to avoid pressure loss caused by temperature difference. Confirm that the pressure gauge is zeroed, open the gland 8, place the sample to be tested in the cylinder 1, cover the gland 8, tighten the hand wheel 3, ensure that the guide rod 5 protrudes from the sleeve 6 to a certain length, and ensure the pressure of the spring on the gland 8 (the gland 8 opens after exceeding this pressure). Turn on the power of the air pump 11, observe the value of the digital pressure gauge 9, and when the required pressure value is reached, manually close the air inlet valve and turn off the air pump 11 at the same time.

[0029] Of course, the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and any equivalent changes and improvements made by ordinary technicians in the technical field within the essential scope of the present invention shall fall within the scope of the patent coverage of the present invention.

Claims

1. A self-rescuer air tightness tester, comprising a cylinder (1), a pressure cover (8) is provided on the cylinder (1), and the pressure cover (8) can be pressed by a pressure beam (4), characterized in that: One end of the pressure beam (4) is hinged to the cylinder (1), and the other end of the pressure beam (4) is provided with a slot iron (41). A screw rod (2) is provided on the side wall of the cylinder (1) at a position corresponding to the slot iron (41). One end of the screw rod (2) is hinged to the cylinder (1), and the screw rod (2) can be inserted into the slot iron (41). The other end of the screw rod (2) is provided with a hand wheel (3), and the hand wheel (3) is connected to the screw rod (2) through a thread. When the hand wheel (3) is turned, the hand wheel (3) can be moved deeper along the screw rod (2) to press the slot iron (41); A vertical guide rod (5) is provided at the center of the top surface of the pressure cover (8), a sleeve (6) is provided in the middle of the pressure beam (4), the guide rod (5) passes through the sleeve (6), a pressure protection spring (7) coiled on the guide rod (5) is provided between the sleeve (6) and the pressure cover (8), and the guide rod (5) is provided with a scale.

2. The self-rescuer air tightness tester according to claim 1, characterized in that: The cylinder (1) is connected to an electric air pump (11).

3. The self-rescuer air tightness tester according to claim 1, characterized in that: The mouth of the cylinder (1) is provided with a sealing ring, the contact surface between the sealing ring and the gland (8) is an annular inclined surface, and the bottom of the gland (8) is an inverted cone that matches the sealing ring.

4. The self-rescuer air tightness tester according to claim 1, characterized in that: The side of the cylinder (1) is connected to a pressure gauge (9) via a pipeline.

5. The self-rescuer air tightness tester according to claim 1, characterized in that: A pressure relief valve (10) is provided on the side of the cylinder (1).

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