Explosion-proof device for compressed air cylinder of air respirator

Abstract

The utility model relates to an explosion-proof device for a compressed air cylinder of an air respirator, which comprises an air cylinder valve, an air hole connected with the compressed air cylinder is formed at the bottom of the air cylinder valve, a setting groove is formed at the top of the air cylinder valve, and the setting groove is communicated with the air hole; the sealing ring is arranged at the bottom of the arrangement groove, a through hole is formed in the sealing ring, and the through hole is communicated with the air hole; the rupture disk is arranged at the top of the sealing ring and blocks the through hole; and the pressing block is in threaded connection with the interior of the arrangement groove, the sealing ring and the rupture disk are pressed by screwing the pressing block, the structure is simple, and use is convenient.

Description

Technical Field

[0001] This utility model relates to the field of gas cylinder explosion protection technology, and specifically to an explosion protection device for compressed gas cylinders of air respirators. Background Technology

[0002] According to the International Maritime Organization (IMO) Convention for the Safety of Life at Sea (1974), ships are required to be equipped with a specified number of self-contained breathing apparatuses for use in emergency rescue operations.

[0003] Air breathing apparatus cylinders store high-pressure gas. In existing technology, cylinder valves are usually installed on the air breathing apparatus cylinders for sealing. However, if the temperature rises during the storage of the air breathing apparatus cylinders, causing the internal pressure of the cylinders to increase, the cylinders may explode. Therefore, the sealing structure of air breathing apparatus cylinders has high requirements. Utility Model Content

[0004] The purpose of this invention is to overcome the defects of the prior art and provide an explosion-proof device for compressed air cylinders of air respirators. By providing a cylinder valve and installing the cylinder valve at the mouth of the air respirator cylinder, when the air pressure inside the cylinder increases, the gas inside the cylinder will break through the rupture disc to relieve the air pressure inside the cylinder, thereby reducing the risk of cylinder explosion.

[0005] The technical solution to achieve the above objective is an explosion-proof device for the compressed air cylinder of an air respirator, comprising:

[0006] A gas cylinder valve, wherein the bottom of the gas cylinder valve is provided with an air hole that is connected to a compressed gas cylinder, and the top of the gas cylinder valve is provided with a groove that is connected to the air hole;

[0007] A sealing ring is disposed at the bottom of the groove, and a through hole is formed on the sealing ring, which is connected to the air hole;

[0008] A rupture disc is disposed at the top of the sealing ring, the rupture disc blocking the through hole; and

[0009] The pressure block, threaded into the groove, is used to press the sealing ring and the rupture disc together by screwing on the pressure block.

[0010] Furthermore, a buffer space is formed inside the gas cylinder valve. The buffer space is disposed between the air hole and the setting groove. The diameter of the buffer space is larger than the diameter of the air hole and smaller than the diameter of the setting groove. The sealing ring covers the buffer space.

[0011] Furthermore, a portion of the sealing ring extends into the buffer space to form an attachment section, which is attached to the side wall of the buffer space.

[0012] Furthermore, the diameter of the sealing ring is larger than the diameter of the buffer space and smaller than the diameter of the groove, and the diameter of the through hole is smaller than the diameter of the buffer space.

[0013] Furthermore, a connecting block is provided between the rupture disc and the pressure block.

[0014] Furthermore, the connecting block has a groove corresponding to the rupture disc, and a portion of the rupture disc is bent into the groove.

[0015] Furthermore, an internal thread is formed in the groove, and an external thread is formed on the pressure block corresponding to the internal thread. The external thread of the pressure block is threadedly connected to the internal thread of the groove.

[0016] Furthermore, a control groove is formed on the side of the pressure block away from the rupture disc, and an adjustment rod can be inserted into the control groove.

[0017] Furthermore, the rupture disc is made of brass.

[0018] Furthermore, the thickness of the sealing ring is determined according to actual requirements.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] By providing a cylinder valve, which is installed at the mouth of the air breathing apparatus cylinder, when the air pressure inside the cylinder increases, the gas inside the cylinder will break through the rupture disc to relieve the air pressure inside the cylinder, thereby reducing the risk of cylinder explosion; when the rupture disc is damaged, only the rupture disc needs to be replaced during maintenance, without replacing the entire cylinder valve, thus reducing maintenance costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an explosion-proof device for a compressed air cylinder in an air respirator.

[0022] Legend: 1. Gas cylinder valve; 2. Pressure block; 3. Connecting block; 4. Rupture disc; 5. Sealing ring. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] See Figure 1An explosion-proof device for a compressed air cylinder of an air respirator includes: a cylinder valve 1, a sealing ring 5, and a pressure block 2. The bottom of the cylinder valve 1 is provided with an air hole connected to the compressed air cylinder, and the top of the cylinder valve 1 is provided with a groove that communicates with the air hole. The sealing ring 5 is provided at the bottom of the groove and has a through hole that communicates with the air hole. A rupture disc 4 is provided at the top of the sealing ring 5 and blocks the through hole. The pressure block 2 is threaded into the groove, and by screwing the pressure block 2, the sealing ring 5 and the rupture disc 4 are pressed together.

[0025] In this invention, a preferred embodiment is as follows: the gas cylinder valve 1 is inserted into the mouth of the compressed gas cylinder of the air respirator, and the pressure block 2 is screwed on to press the sealing ring 5 and the rupture disc 4 together. The sealing ring 5 deforms and fills the gap between the rupture disc 4 and the groove to prevent gas leakage. Preferably, a vent is formed on the pressure block 2 at the position corresponding to the air hole. When the external gas is too large, the gas in the compressed gas cylinder breaks through the rupture disc 4 and is discharged from the vent to relieve the pressure of the gas in the compressed gas cylinder.

[0026] Furthermore, a limiting thread is formed inside the mouth of the compressed air cylinder of the air respirator, and the cylinder valve 1 has an internal thread corresponding to this thread. By threading the cylinder valve 1 onto the limiting thread, the cylinder valve 1 is fixed to the mouth of the compressed air cylinder.

[0027] Furthermore, this rupture disc 4, also known as an explosion-proof membrane or pressure relief membrane, is a type of rupture-type safety pressure relief device. When a chemical explosion occurs, it protects the equipment from damage. Its working principle is based on the characteristics of explosion development. A certain size of brittle material is placed in an appropriate part of the equipment or container to form a weak link. When the explosion just occurs, these weak links are destroyed first under the action of a relatively small explosion pressure, immediately releasing a large amount of gas and heat. The explosion pressure and temperature are unlikely to continue to rise, thereby protecting the main body of the equipment or container from greater damage and preventing fatal injuries or deaths of the production personnel on site.

[0028] Preferably, the sealing ring 5 is made of a deformable material such as rubber or plastic. When the sealing ring 5 is squeezed, it can fill the gap between the rupture disc 4 and the groove, thus preventing gas leakage.

[0029] Furthermore, a buffer space is formed within the gas cylinder valve 1, the buffer space being disposed between the air hole and the mounting groove. The diameter of the buffer space is larger than the diameter of the air hole but smaller than the diameter of the mounting groove, and the sealing ring 5 covers the buffer space. Preferably, the buffer space connects the air hole and the mounting groove.

[0030] Furthermore, a portion of the sealing ring 5 extends into the buffer space to form an adhesive section, which adheres to the side wall of the buffer space. By providing this adhesive section, the sealing ring 5 can also extend radially into the buffer space when the pressure block 2 is screwed on. This prevents the sealing ring 5 from deforming under pressure and extending towards the inner wall of the groove when the pressure block 2 squeezes it, thus avoiding excessive compression and adhesion of the sealing ring 5 to the inner wall of the groove. This would prevent the sealing ring 5 from being removed when replacing the rupture disc 4 and the sealing ring 5.

[0031] Furthermore, the diameter of the sealing ring 5 is larger than the diameter of the buffer space and smaller than the diameter of the setting groove, and the diameter of the through hole is smaller than the diameter of the buffer space. Preferably, the diameter of the sealing ring 5 is slightly smaller than the inner diameter of the setting groove, so as to prevent the sealing ring 5 from sticking to the inner wall of the setting groove due to excessive compression by the pressure block 2 during compression.

[0032] Furthermore, a connecting block 3 is provided between the rupture disc 4 and the pressure block 2. Preferably, the connecting block 3 has a connecting hole corresponding to the vent, so that when the rupture disc 4 is damaged, the gas in the compressed gas cylinder is discharged out of the compressed gas cylinder through the connecting hole and the vent.

[0033] Furthermore, the connecting block 3 has a groove corresponding to the rupture disc 4, and a portion of the rupture disc 4 is bent into the groove. Preferably, by bending the rupture disc 4 into the groove, it is avoided that the rupture disc 4 would be ruptured by the increased gas pressure inside the compressed gas cylinder, thereby releasing the gas from the compressed gas cylinder.

[0034] Furthermore, an internal thread is formed within the groove, and an external thread is formed on the pressure block 2 corresponding to the internal thread. The external thread of the pressure block 2 is threadedly connected to the internal thread of the groove. By screwing the groove, it is easier for construction personnel to tighten or loosen the screws.

[0035] Furthermore, a control groove is formed on the side of the pressure block 2 away from the rupture disc 4, and an adjustment rod can be inserted into the control groove.

[0036] Furthermore, the rupture disc 4 is made of brass. Preferably, the rupture disc 4 may also be made of brittle materials such as aluminum sheet.

[0037] Furthermore, the thickness of the sealing ring 5 is determined according to actual requirements.

[0038] The following describes the usage process of the sealing device for the compressed air cylinder of an air respirator according to this utility model.

[0039] Insert the gas cylinder valve 1 into the mouth of the compressed gas cylinder of the air respirator, and screw the pressure block 2 to press the sealing ring 5 and the rupture disc 4 together. The sealing ring 5 will deform and fill the gap between the rupture disc 4 and the setting groove to prevent gas from leaking out.

[0040] When the external gas pressure is too high, the gas in the compressed gas cylinder will break through the rupture disc 4 and be discharged from the vent to relieve the pressure of the gas in the compressed gas cylinder. When the rupture disc 4 is damaged, the rupture disc 4 and the sealing gasket should be replaced in time.

[0041] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. An air breather explosion prevention device for an air breathing apparatus compressed gas cylinder, characterized by, The utility model relates to a gas cylinder valve, which comprises: a gas cylinder valve, the bottom of which is provided with a gas hole for connecting a compressed gas cylinder, and the top of which is provided with a setting groove, which is in communication with the gas hole; a sealing ring arranged at the bottom of the setting groove, which is provided with a through hole, which is in communication with the gas hole; a bursting disc arranged at the top of the sealing ring, which blocks the through hole; and a pressing block screwed into the setting groove, which is used to press the sealing ring and the bursting disc by screwing.

2. The air respirator compressed gas cylinder explosion prevention device according to claim 1, characterized in that: The gas cylinder valve is provided with a buffer space, which is arranged between the gas hole and the setting groove, and the diameter of the buffer space is larger than that of the gas hole and smaller than that of the setting groove, and the sealing ring covers the buffer space.

3. The air respirator compressed gas cylinder explosion prevention device of claim 2, wherein: The sealing ring has a part extending into the buffer space to form a sticking segment, which is in contact with the side wall of the buffer space.

4. The air respirator compressed gas cylinder explosion prevention device of claim 2, wherein: The diameter of the sealing ring is larger than that of the buffer space and smaller than that of the setting groove, and the diameter of the through hole is smaller than that of the buffer space.

5. The air respirator compressed gas cylinder explosion prevention device of claim 1, wherein: A connecting block is arranged between the bursting disc and the pressing block.

6. The air respirator compressed gas cylinder explosion prevention device of claim 5, wherein: The connecting block is provided with a groove corresponding to the bursting disc, and the bursting disc is bent towards the groove.

7. The air respirator compressed gas cylinder explosion prevention device of claim 1, wherein: The setting groove is provided with an internal thread, and the pressing block is provided with an external thread corresponding to the internal thread, and the external thread of the pressing block is screwed into the internal thread of the setting groove.

8. The explosion prevention device for the compressed gas cylinder of the air respirator according to claim 1, characterized in that: The side of the pressing block away from the bursting disc is provided with a control groove, in which an adjusting rod can be inserted.

9. The explosion prevention device for compressed gas cylinder of air respirator according to claim 1, characterized in that: The bursting disc is made of brass.

10. The explosion prevention device for the compressed gas cylinder of the air respirator according to claim 1, characterized in that: The thickness of the sealing ring is determined according to actual requirements.

Images