A new type of safety gas cylinder valve

Abstract

The present invention relates to a novel safety gas cylinder valve, comprising a valve body, wherein a flow limiting protector is arranged at the lower end of the valve body, wherein the flow limiting protector comprises a main body, a flow limiting valve and a material blocking tube, wherein a threaded section is arranged on the surface of the main body, wherein a first cavity and a second cavity for gas transmission are arranged inside the main body, and a chamfer is arranged at the connection between the first cavity and the second cavity; an installation groove is arranged in the first cavity, wherein the upper end of the flow limiting valve is arranged in the installation groove, and the lower end of the flow limiting valve is arranged inside the second cavity; the present invention enables the high-pressure gas inside the gas cylinder valve to be gradually released from the gap when the gas cylinder valve is broken through the gap generated when the chamfer abuts against the conical truncated cone, thereby making the gas cylinder safety valve have higher safety performance, thereby eliminating the potential safety hazard of the gas cylinder valve and protecting the safety of the user and surrounding personnel; at the same time, through the design of the material blocking tube, the flow limiting valve can be firmly positioned inside the main body, thereby enhancing the stability of the structure.

Description

Technical Field

[0001] The invention relates to a novel safety gas cylinder valve. Background Art

[0002] At present, various gas cylinders are widely used in various fields, such as air respirators in the fire fighting field, oxygen cylinders in the medical field, etc. These gas cylinders often store high-pressure gas. When an accident occurs and the gas cylinder valve breaks, the high-pressure gas in the gas cylinder is released instantly, causing the gas cylinder to run around and cause harm to the user and nearby personnel. However, the gas cylinder valves currently on the market lack this protection function after accidental disconnection. Summary of the invention

[0003] The object of the present invention is to provide a new type of safety gas cylinder valve, comprising a valve body, a flow limiting protector is arranged at the lower end of the valve body, the flow limiting protector comprises a main body, a flow limiting valve and a blocking tube, a threaded section is arranged on the surface of the main body, a first cavity and a second cavity for gas transmission are arranged inside the main body, and a chamfer is arranged at the connection between the first cavity and the second cavity; a mounting groove is opened in the first cavity, the upper end of the flow limiting valve is arranged in the mounting groove, and the lower end of the flow limiting valve is arranged inside the second cavity;

[0004] An air passage is provided in the flow limiting valve, an air outlet is provided at the bottom of the air passage, a conical truncated cone is formed at the lower end of the flow limiting valve, and a ventilation groove is provided at the lower end of the conical truncated cone;

[0005] The object-blocking tube is installed at the lower end of the main body, the upper end of the object-blocking tube abuts against the lower end surface of the flow-limiting valve, an air flow channel is opened in the middle of the object-blocking tube, and the air flow channel is connected to the ventilation groove.

[0006] Preferably, the upper end surface of the installation groove is formed with a first section surface, the lower end surface is formed with a second section surface, and the plane where the upper end portion of the threaded segment is located is located between the first section surface and the second section surface.

[0007] Preferably, the radial cross-sectional area of ​​the mounting groove of the first cavity is larger than the radial cross-sectional area of ​​the first cavity, and the radial cross-sectional area of ​​the second cavity is larger than the radial cross-sectional area of ​​the mounting groove of the first cavity.

[0008] Preferably, a filter element is provided inside the object blocking tube, and the filter element is detachably mounted on the upper end of the object blocking tube, and the airflow passing through the ventilation groove passes through the filter element and enters the airflow channel.

[0009] Preferably, an air outlet hole communicating with the mounting groove of the first cavity is provided on the surface of the main body.

[0010] Preferably, there is a gap between the upper end of the flow limiting valve and the mounting groove of the first cavity.

[0011] Preferably, the outer periphery of the conical cone is a conical surface, and the surface roughness of the conical surface is greater than 1.6.

[0012] Preferably, the valve body and the current limiting protector are integrally formed.

[0013] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0014] 1. The present invention blocks the gas leakage after the break by abutting the chamfer with the conical truncated cone, and the gap generated by the two allows the high-pressure gas inside the gas cylinder valve to be gradually released from the gap when the gas cylinder valve breaks, so that the new safety gas cylinder valve has higher safety performance, thereby eliminating the safety hazards of the gas cylinder valve and protecting the safety of users and surrounding personnel; at the same time, through the design of the blocking tube, the flow limiting valve can be firmly positioned inside the main body, thereby enhancing the stability of the structure.

[0015] 2. The present invention limits the position where the valve body breaks by limiting the range of the threaded section, so that when the cylinder valve breaks, the current limiting protector can work normally.

[0016] 3. The present invention pushes the flow limiting valve to move by the blocking tube, so that the flow limiting valve is seamlessly abutted against the first section of the installation groove, thereby allowing the gas to flow along the designed route.

[0017] 4. The present invention improves the quality of gas and increases the service life of the gas cylinder by setting the filter element.

[0018] 5. The invention adopts the design of the air outlet hole so that the high-pressure gas in the gas cylinder valve can be discharged in a safe manner during the disassembly of the gas cylinder, thereby reducing the risks during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of a preferred embodiment of the present invention;

[0020] Figure 2 An exploded view of a current limiting protector according to a preferred embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of a novel safety gas cylinder valve according to a preferred embodiment of the present invention installed in a gas cylinder;

[0022] Figure 4 It is a schematic diagram of a current limiting protector in a preferred embodiment of the present invention in a working state;

[0023] Figure 5 A schematic diagram of a current limiting protector in a preferred embodiment of the present invention when the valve body is broken;

[0024] Figure 6 It is a structural schematic diagram of a flow limiting valve in a preferred embodiment of the present invention;

[0025] Figure 7 for Figure 5 Enlarged view of point A in .

[0026] The meanings of the numbers in the figure are as follows: 1-main body; 2-first cavity; 3-second cavity; 4-flow limiting valve; 5-object blocking tube; 6-flow limiting protector; 7-valve body; 8-gas cylinder; 11-air outlet; 21-installation groove; 22-first section surface; 23-second section surface; 31-chamfer; 41-upper end; 42-lower end; 421-ventilation column; 422-conical frustum; 423-ventilation groove; 424-air outlet; 43-airway; 51-filter element; 52-air flow channel. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the accompanying drawings.

[0028] A new type of safety gas cylinder valve shown in the present invention includes a valve body 7, a flow limiting protector 6 is arranged at the lower end of the valve body 7, the flow limiting protector 6 includes a main body 1, a flow limiting valve 4 and a material blocking tube 5, a threaded section 12 is arranged on the surface of the main body 1, and the main body 1 has a first cavity 2 and a second cavity 3 for gas transmission, and a chamfer 31 is arranged at the connection between the first cavity 2 and the second cavity 3; the upper end 41 of the flow limiting valve 4 is arranged in the installation groove 21, and the lower end 42 of the flow limiting valve 4 is arranged inside the second cavity 3.

[0029] An air channel 43 is provided in the flow limiting valve 4, and an air outlet 424 is provided at the bottom of the air channel 43 to achieve gas circulation between the first cavity 2 and the second cavity 3. A conical frustum 422 is formed at the lower end of the flow limiting valve 4, and a ventilation groove 423 is provided at the lower end of the conical frustum to achieve gas circulation between the object blocking tube 5 and the second cavity 3.

[0030] The object-blocking tube 5 is installed at the lower end of the main body 1, and the upper end of the object-blocking tube 5 abuts against the lower end surface of the flow-limiting valve 4. An airflow channel 52 is opened in the middle of the object-blocking tube, and the airflow channel 52 is connected to the ventilation groove 423. The object-blocking tube 5 is connected to the lower end of the main body 1 through a threaded connection. The object-blocking tube 5 pushes the flow-limiting valve 4 to move upward to achieve seamless abutment between the flow-limiting valve 4 and the first section 22 of the installation groove.

[0031] In this embodiment, the upper end surface of the installation groove 21 is formed with a first section surface 22, and the lower end surface is formed with a second section surface 23, and the plane where the upper end of the threaded segment 12 is located is located between the first section surface and the second section surface.

[0032] In this embodiment, the radial cross-sectional area of ​​the mounting groove 21 of the first cavity 2 is larger than the radial cross-sectional area of ​​the first cavity 2 , and the radial cross-sectional area of ​​the second cavity 3 is larger than the radial cross-sectional area of ​​the mounting groove 21 of the first cavity 2 .

[0033] A filter element 51 is provided inside the object blocking tube 5 and is installed at the upper end of the object blocking tube 5 . In this embodiment, the filter element 51 is connected to the object blocking tube 5 by threads, and the airflow passing through the ventilation groove 423 passes through the filter element 51 and enters the airflow channel 52 .

[0034] The main body 1 is provided with an air outlet 11 on its surface which is connected to the mounting groove 21 of the first cavity 2; Figure 1 As shown, the main body 1 is connected to the gas cylinder 8 via a threaded section arranged on the surface of the main body and sealed with a sealing ring.

[0035] There is a gap between the upper end 41 of the flow limiting valve 4 and the mounting groove 21 of the first cavity 2. When the gas cylinder is disassembled, the high-pressure gas in the valve passes through the gap and slowly flows out from the gas outlet.

[0036] The outer periphery of the conical cone 422 is a conical surface, and the surface roughness of the conical surface is greater than 1.6. When the conical surface abuts against the chamfer 31, there is a gap of appropriate size between the two so that the gas can flow out.

[0037] The valve body 7 and the current limiting protector 6 are integrally formed.

[0038] The working principle of the present invention is as follows: when the gas cylinder is inflated, the gas enters the current limiting protector 6 through the valve body 7. First, the gas passes through the first cavity 2, then enters the second cavity 3 through the gas outlet 424, and then the gas passes through the venting groove 423 and passes through the filter element 51 to enter the gas flow channel 52. After being filtered by the filter element 51 in the blocking tube 5, the gas enters the gas cylinder 8. In addition, since the transition part with and without threads is a part where stress is concentrated and more likely to break, the design of the thread segment range ensures that the height of the plane where the upper end of the thread segment 12 is located is less than the first segment surface and higher than the second segment surface. Therefore, when the new safety gas cylinder valve is accidentally hit, the part of the main body within the range of the first segment surface and the second segment surface of the first cavity 2 is more likely to break than other parts. At this time, the air pressure in the gas cylinder 8 pushes the flow limiting valve 4 outward until the conical cone in the flow limiting valve 4 presses against the chamfer 31 so that the leaking port after the break is blocked. Then the high-pressure gas in the gas cylinder 8 enters the object blocking tube 5, and the airflow passing through the filter element 51 passes through the ventilation groove 423 into the second cavity 3, and then enters the first cavity 2 through the gap formed by the conical cone 422 and the chamfer 31, and finally slowly enters the air from the upper end 41 of the flow limiting valve through the air outlet 424.

[0039] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel safety gas cylinder valve, comprising a valve body (7), characterized in that: A flow limiting protector (6) is arranged at the lower end of the valve body (7), and the flow limiting protector (6) comprises a main body (1), a flow limiting valve (4) and a material blocking tube (5); a threaded section (12) is arranged on the surface of the main body (1); a first cavity (2) and a second cavity (3) for gas transmission are arranged inside the main body (1); a chamfer (31) is arranged at the connection between the first cavity (2) and the second cavity (3); a mounting groove (21) is arranged in the first cavity (2), an upper end (41) of the flow limiting valve (4) is arranged in the mounting groove (21), and a lower end (42) of the flow limiting valve (4) is arranged inside the second cavity (3); An air passage (43) is provided in the flow limiting valve (4), an air outlet (424) is provided at the bottom of the air passage, a conical truncated cone (422) is formed at the lower end of the flow limiting valve (4), and a ventilation groove (423) is provided at the lower end of the conical truncated cone; The object blocking tube (5) is installed at the lower end of the main body (1), the upper end of the object blocking tube (5) is in contact with the lower end surface of the flow limiting valve (4), an air flow channel (52) is provided in the middle of the object blocking tube, and the air flow channel (52) is connected to the ventilation groove (423); The main body (1) has an air outlet (11) on its surface which is connected to the mounting groove (21) of the first cavity (2); The upper end surface of the installation groove (21) is formed with a first section surface (22), and the lower end surface is formed with a second section surface (23), and the plane where the upper end of the threaded section (12) is located is located between the first section surface and the second section surface; The radial cross-sectional area of ​​the mounting groove (21) of the first cavity (2) is larger than the radial cross-sectional area of ​​the first cavity (2), and the radial cross-sectional area of ​​the second cavity (3) is larger than the radial cross-sectional area of ​​the mounting groove (21) of the first cavity (2); The outer periphery of the conical truncated cone (422) is a conical surface. When the conical surface abuts against the chamfer (31), a gap exists between the two for gas to flow out.

2. A new type of safety gas cylinder valve according to claim 1, characterized in that: A filter element (51) is provided inside the object blocking tube (5), and the filter element (51) is installed at the upper end of the object blocking tube (5). The airflow passing through the ventilation groove (423) passes through the filter element (51) and enters the airflow channel (52).

3. A new type of safety gas cylinder valve according to claim 2, characterized in that: There is a gap between the upper end (41) of the flow limiting valve (4) and the mounting groove (21) of the first cavity (2).

4. A novel safety gas cylinder valve according to claim 1, characterized in that: The surface roughness of the tapered surface is greater than 1.

6.

5. A novel safety gas cylinder valve according to claim 1, characterized in that: The valve body (7) and the current limiting protector (6) are integrally formed.

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