A gas cylinder pressure reducing valve

Abstract

A gas cylinder pressure reducing valve includes a valve body provided with a valve cavity, and also includes a transfer pipe. A limiting hole is provided on the side wall of the valve body. The transfer pipe includes a first pipe end provided with a check valve and a second pipe end passing through the limiting hole and entering the valve cavity. An adjusting member is provided outside the valve body. The adjusting member is used to push the second pipe end towards the high-pressure hole so that the high-pressure hole is closed relative to the valve cavity and communicated with the inner hole of the transfer pipe. A positioning boss is provided between the second pipe end and the transfer part of the transfer pipe. A piston ring is sleeved between the positioning boss and the transfer part. The piston ring is provided with a diversion hole for communicating the low-pressure area and the high-pressure area. The positioning boss is used for the piston ring to abut against to close the diversion hole. A spring is provided in the valve cavity. The spring abuts against the piston ring and is used to push the piston ring away from the positioning boss. The above solution not only realizes the convenient inflation of the gas cylinder, but also realizes the automatic adjustment of the air pressure in the valve cavity through the combined action of the positioning boss, the piston ring and the spring, so that the air pressure of the discharged air flow is stable.

Description

Technical Field

[0001] The present invention relates to the field of pressure reducing valves, and particularly to a gas cylinder pressure reducing valve. Background Art

[0002] The positive pressure air breathing apparatus is a self-contained open type air breathing apparatus, which is mainly applicable to fire fighting, chemical industry, ships, petroleum, smelting, factories and mines, laboratories, etc., enabling firefighters or rescue and relief personnel to carry out fire fighting, rescue and relief, and rescue work safely in harsh environments full of thick smoke, poisonous gas, steam or lack of oxygen.

[0003] The principle of the positive pressure air breathing apparatus is that air is stored in the gas cylinder in a high-pressure (70 MPa pressure) manner. When in use, the high-pressure air in the gas cylinder is multi-stage decompressed through the cylinder valve. After the output air pressure is reduced to 0.7 MPa, it is transported to the supply valve. After being decompressed again by the supply valve, positive pressure air is provided to the user through the full face mask to ensure sufficient breathable air for the user. However, the airflow after decompression by the existing cylinder valve is often not very stable, especially when switching the on-off, large air pressure fluctuations are likely to occur, which is likely to cause discomfort to the user and even may form a safety hazard. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas cylinder pressure reducing valve that can effectively decompress high-pressure air and make the output airflow stable with small fluctuations.

[0005] To solve the above problems, the present invention provides a gas cylinder pressure reducing valve, including a valve body provided with a valve cavity. A low-pressure hole and a high-pressure hole are respectively communicated on both sides of the valve cavity. The valve body further includes an adapter pipe. A limiting hole communicated with the valve cavity is provided on the side wall of the valve body. The adapter pipe includes a first pipe end provided with a check valve and a second pipe end passing through the limiting hole and entering the valve cavity. A transfer portion and a positioning boss are provided on the side surface of the adapter pipe. The transfer portion is slidably connected to the limiting hole. The positioning boss is located between the transfer portion and the second pipe end. The outer diameter of the second pipe end is larger than the aperture of the high-pressure hole. An adjusting member is provided on the outer side of the valve body. The adjusting member is used to push the second pipe end towards the high-pressure hole so that the high-pressure hole is closed relative to the valve cavity and communicated with the inner hole of the adapter pipe. A piston ring is sleeved between the positioning boss and the transfer portion. The piston ring divides the valve cavity into a low-pressure area communicated with the low-pressure hole and a high-pressure area communicated with the high-pressure hole. The piston ring is provided with a diversion hole for communicating the low-pressure area and the high-pressure area. The positioning boss is used for the piston ring to abut against to close the diversion hole. A spring is provided in the valve cavity. The spring abuts against the piston ring and is used to push the piston ring away from the positioning boss.

[0006] Compared with the prior art, the above scheme realizes convenient inflation of the gas cylinder through the setting of the adapter tube and the adjusting part, and realizes that the air pressure in the low-pressure area can be automatically adjusted when the gas cylinder is deflated through the combined action of the positioning boss, the piston ring and the spring, so that the air pressure of the airflow discharged from the low-pressure hole is stable and has small fluctuations, and has good practicality.

[0007] Preferably, the adapter part is an adapter sleeve, the outer wall of the adapter sleeve is slidably inserted into the limiting hole, and the adapter sleeve includes a first barrel section located on the inner side of the valve cavity, and the first barrel section is provided with a raised limiting boss, thereby ensuring that the adapter tube can slide more stably relative to the limiting hole and has good air tightness.

[0008] Preferably, the adapter sleeve also includes a second barrel section located outside the valve body, the adjusting member is a handwheel with external threads, the outer wall of the valve body is provided with a screw hole, the axis of the screw hole is parallel to the axis of the limiting hole, the handwheel is threadedly connected to the screw hole, and the handwheel is used to abut against the second barrel section, so that the position of the adapter tube relative to the valve body can be adjusted by turning the handwheel, which is simple and convenient to operate and has high reliability.

[0009] Preferably, the screw hole is coaxially arranged with the limiting hole, and the handwheel is provided with a through hole for the transfer tube to pass through, and the aperture of the through hole is smaller than the outer diameter of the second barrel section, thereby making the structure more compact while ensuring the pushing effect of the handwheel on the transfer tube.

[0010] Preferably, the side of the positioning boss facing the high-pressure hole is tapered, so that the airflow flowing in from the high-pressure hole can be effectively guided and diverted by the positioning boss and then flow to the guide hole.

[0011] Preferably, the guide hole is the inner ring hole of the piston ring, and the inner ring hole of the piston ring is sleeved on the outer side of the transfer tube. The diameter of the inner ring hole of the piston ring is larger than the outer diameter of the transfer tube, so that the structure is more compact and easy to process.

[0012] Preferably, a support ring is provided in the middle of the valve cavity, the piston ring passes through the inner ring of the support ring, one end of the spring abuts against the support ring, and the other end abuts against the outer wall of the piston ring, so that the piston ring can move more smoothly in the valve cavity and the pushing effect of the spring on the piston ring is more stable.

[0013] Preferably, a high-pressure sealing ring is provided in the valve cavity located in the high-pressure zone, and the high-pressure sealing ring abuts against the outer wall of the piston ring; a low-pressure sealing ring is provided in the valve cavity located in the low-pressure zone, and the low-pressure sealing ring abuts against the outer wall of the piston ring, thereby effectively improving the air tightness between the high-pressure zone and the low-pressure zone.

[0014] Preferably, the cross-section of the high-pressure sealing ring is S-shaped, and the cross-section of the low-pressure sealing ring is C-shaped, further improving the airtightness between the high-pressure area and the low-pressure area. Description of the Drawings

[0015] Figure 1 An isometric schematic diagram of a gas cylinder pressure reducing valve;

[0016] Figure 2 A cross-sectional schematic diagram of a gas cylinder pressure reducing valve in the front-rear direction;

[0017] Figure 3 A cross-sectional schematic diagram of a gas cylinder pressure reducing valve in the left-right direction.

[0018] Description of the reference numerals:

[0019] 1. Valve body; 101. Low-pressure hole; 101a. Low-pressure area; 102. High-pressure hole; 102a. High-pressure area; 103. Limit hole; 104. Screw hole; 110. Support ring; 2. Adapter pipe; 210. Adapter part; 211. First cylinder section; 212. Limit boss; 213. Second cylinder section; 220. Check valve; 230. Positioning boss; 3. Piston ring; 301. Diversion hole; 310. Low-pressure sealing ring; 320. High-pressure sealing ring; 4. Spring; 5. Adjusting part; 501. Through hole. Detailed Description of the Embodiments

[0020] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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 of 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. In addition, it should be noted that all directional indications (such as up, down, left, right, front, back, inside, outside) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0021] Please refer to Figures 1 - 3, A gas cylinder pressure reducing valve provided by an embodiment of the present invention includes a valve body 1 provided with a valve cavity. The two sides of the valve cavity are respectively communicated with a low-pressure hole 101 and a high-pressure hole 102. It further includes a transfer pipe 2. A limiting hole 103 communicated to the valve cavity is provided on the side wall of the valve body 1. The transfer pipe 2 includes a first pipe end provided with a one-way valve 220 and a second pipe end passing through the limiting hole 103 and entering the valve cavity. A transfer portion 210 and a positioning boss 230 are provided on the side surface of the transfer pipe 2. The transfer portion 210 is slidably connected to the limiting hole 103. The positioning boss 230 is located between the transfer portion 210 and the second pipe end. The outer diameter of the second pipe end is larger than the aperture of the high-pressure hole 102. An adjusting member 5 is provided outside the valve body 1. The adjusting member 5 is used to push the second pipe end towards the high-pressure hole 102 so that the high-pressure hole 102 is closed relative to the valve cavity and communicated with the inner hole of the transfer pipe 2. A piston ring 3 is provided between the positioning boss 230 and the transfer portion 210. The piston ring 3 divides the valve cavity into a low-pressure area 101a communicated to the low-pressure hole 101 and a high-pressure area 102a communicated to the high-pressure hole 102. The piston ring 3 is provided with a diversion hole 301 for communicating the low-pressure area 101a and the high-pressure area 102a. The positioning boss 230 is used for the piston ring 3 to abut against to close the diversion hole 301. A spring 4 is provided in the valve cavity. The spring 4 abuts against the piston ring 3 and is used to push the piston ring 3 away from the positioning boss 230.

[0022] When it is necessary to inflate the gas cylinder, first connect the high-pressure hole 102 to the bottle mouth of the gas cylinder, and then push the transfer pipe 2 towards the high-pressure hole 102 through the adjusting member 5 until the second pipe end abuts against the valve cavity. At this time, the high-pressure hole 102 is closed relative to the valve cavity and communicated with the inner hole of the transfer pipe 2. Then connect the inflation pipeline to the one-way valve 220. The inflation gas enters the gas cylinder through the one-way valve 220, the inner hole of the transfer pipe 2, and the high-pressure hole 102 in sequence to realize inflation.

[0023] When it is necessary to decompress and release gas from the gas cylinder, loosen the adjusting member 5. Due to the high air pressure, the high-pressure hole 102 pushes the transfer pipe 2 away from the high-pressure hole 102 until the high-pressure hole 102 resumes its communication state with the valve cavity; the high-pressure gas in the gas cylinder enters the high-pressure area 102a of the valve cavity, and after being decompressed through the diversion hole 301, it enters the low-pressure area 101a, and finally enters the low-pressure hole 101 from the low-pressure area 101a and is discharged, realizing multi-stage decompression.

[0024] During the decompression and deflation process, when the air pressure in the low-pressure area 101a is higher than the preset value, the side of the piston ring 3 in contact with the low-pressure area 101a will be subjected to the air pressure thrust of the low-pressure area 101a, causing the piston ring 3 to move towards the positioning boss 230. Since the gap between the piston ring 3 and the positioning boss 230 becomes smaller, the gas flow rate through the diversion hole 301 decreases until the air pressure in the low-pressure area 101a gradually returns to the normal value. At the same time, the spring 4 gradually pushes the piston ring 3 away from the positioning boss 230, restoring the gap between the piston ring 3 and the positioning boss 230 to normal. Similarly, when the air pressure in the low-pressure area 101a is lower than the preset value, the side of the piston ring 3 in contact with the low-pressure area 101a will be subjected to the air pressure pull of the low-pressure area 101a, causing the piston ring 3 to move away from the positioning boss 230. Since the gap between the piston ring 3 and the positioning boss 230 becomes larger, the gas flow rate through the diversion hole 301 increases until the air pressure in the low-pressure area 101a gradually returns to the normal value, and then the gap between the piston ring 3 and the positioning boss 230 returns to normal.

[0025] Compared with the prior art, the above solution realizes the convenient inflation of the gas cylinder through the setting of the adapter tube 2 and the adjusting member 5. Through the combined action of the positioning boss 230, the piston ring 3 and the spring 4, when the gas cylinder deflates, the air pressure in the low-pressure area 101a can be automatically adjusted, making the air pressure of the airflow discharged from the low-pressure hole 101 stable and with small fluctuations, and having good practicability.

[0026] The adapter part 210 and the adapter tube 2 can be an integrated structure or a split structure. In this embodiment, the adapter part 210 is an adapter sleeve, and the adapter sleeve and the adapter tube 2 are detachably connected by threads, which is convenient for assembly. Of course, the adapter sleeve and the adapter tube 2 can also be connected by clamping, pinning, etc., and this design is not limited. The outer side wall of the adapter sleeve is slidably inserted into the limit hole 103. Considering improving the sealing performance, a rubber gasket can also be provided on the hole wall of the limit hole 103, and the outer side wall of the adapter sleeve abuts against the rubber gasket to achieve better airtightness. The adapter sleeve includes a first tube section 211 located inside the valve cavity and a second tube section 213 located outside the valve body 1. The first tube section 211 is provided with a protruding limit boss 212, which ensures that the adapter tube 2 can slide more stably relative to the limit hole 103 and has good airtightness.

[0027] The adjusting member 5 is a handwheel provided with an external thread. A threaded hole 104 is provided on the outer side wall of the valve body 1. The axis of the threaded hole 104 is parallel to the axis of the limiting hole 103. The handwheel is threadedly connected to the threaded hole 104. The handwheel is used to abut against the second cylinder section 213. Thus, by rotating the handwheel, the position adjustment of the adapter pipe 2 relative to the valve body 1 can be realized. The operation is simple and convenient, and the reliability is high. Further, the threaded hole 104 and the limiting hole 103 are coaxially arranged. The handwheel is provided with a through hole 501 for the adapter pipe 2 to pass through. The aperture of the through hole 501 is smaller than the outer diameter of the second cylinder section 213. Thus, on the premise of ensuring the pushing effect of the handwheel on the adapter pipe 2, the structure is more compact.

[0028] As an optimization of the above embodiment, the side of the positioning boss 230 facing the high-pressure hole 102 is conical. Thus, the airflow flowing in from the high-pressure hole 102 can be effectively guided and shunted by the positioning boss 230 and then flow to the diversion hole 301.

[0029] The diversion holes 301 can be a plurality of through holes axially arranged along the piston ring 3. In this embodiment, the diversion holes 301 are the inner ring holes of the piston ring 3. The inner ring holes of the piston ring 3 are sleeved on the outer side of the adapter pipe 2. The diameter of the inner ring holes of the piston ring 3 is larger than the outer diameter of the adapter pipe 2. Thus, a flow channel for the airflow to pass through is formed between the inner ring holes of the piston ring 3 and the adapter pipe 2. Thus, the structure is more compact and easy to process.

[0030] As an optimization of the above embodiment, a support ring 110 is provided in the middle of the valve cavity. The piston ring 3 passes through the inner ring of the support ring 110. One end of the spring 4 abuts against the support ring 110, and the other end abuts against the outer side wall of the piston ring 3. Thus, the piston ring 3 can move more smoothly in the valve cavity, and the pushing effect of the spring 4 on the piston ring 3 is more stable.

[0031] As a further optimization of the above embodiment, a high-pressure sealing ring 320 is provided in the valve cavity in the high-pressure area. The high-pressure sealing ring 320 abuts against the outer side wall of the piston ring 3. A low-pressure sealing ring 310 is provided in the valve cavity in the low-pressure area. The low-pressure sealing ring 310 abuts against the outer side wall of the piston ring 3. Thus, the airtightness between the high-pressure area and the low-pressure area is effectively improved. Further, the cross section of the high-pressure sealing ring 320 is S-shaped, and the cross section of the low-pressure sealing ring 310 is C-shaped, further improving the airtightness between the high-pressure area and the low-pressure area.

[0032] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. For those skilled in the art, without departing from the spirit and scope of the present disclosure, various changes and modifications can be made, and these changes and modifications will all fall within the protection scope of the invention.

Claims

1. A gas cylinder pressure reducing valve, comprising a valve body (1) provided with a valve cavity, both sides of the valve cavity are respectively communicated with a low-pressure hole (101) and a high-pressure hole (102), Characterized in that: It further includes a transfer pipe (2), a limiting hole (103) communicated with the valve cavity is provided on the side wall of the valve body (1), the transfer pipe (2) includes a first pipe end provided with a one-way valve (220) and a second pipe end passing through the limiting hole (103) and entering the valve cavity, a transfer part (210) and a positioning boss (230) are provided on the side surface of the transfer pipe (2), the transfer part (210) is slidably connected to the limiting hole (103), the positioning boss (230) is located between the transfer part (210) and the second pipe end, the outer diameter of the second pipe end is larger than the aperture of the high-pressure hole (102), an adjusting member (5) is provided on the outer side of the valve body (1), and the adjusting member (5) is used to push the second pipe end towards the high-pressure hole (102) so that the high-pressure hole (102) is closed relative to the valve cavity and communicated with the inner hole of the transfer pipe (2), a piston ring (3) is provided between the positioning boss (230) and the transfer part (210), the piston ring (3) divides the valve cavity into a low-pressure area (101a) communicated with the low-pressure hole (101) and a high-pressure area (102a) communicated with the high-pressure hole (102), the piston ring (3) is provided with a diversion hole (301) for communicating the low-pressure area (101a) and the high-pressure area (102a), the positioning boss (230) is used for the piston ring (3) to abut against to close the diversion hole (301), a spring (4) is provided in the valve cavity, and the spring (4) abuts against the piston ring (3) and is used to push the piston ring (3) away from the positioning boss (230).

2. A gas cylinder pressure reducing valve according to claim 1, Characterized in that: The transfer part (210) is a transfer sleeve, the outer side wall of the transfer sleeve is slidably inserted into the limiting hole (103), the transfer sleeve includes a first cylinder section (211) located inside the valve cavity, and the first cylinder section (211) is provided with a protruding limiting boss (212).

3. A gas cylinder pressure reducing valve according to claim 2, Characterized in that: The transfer sleeve further includes a second cylinder section (213) located outside the valve body (1), the adjusting member (5) is a handwheel provided with an external thread, a threaded hole (104) is provided on the outer side wall of the valve body (1), the axis of the threaded hole (104) is parallel to the axis of the limiting hole (103), the handwheel is threadedly connected to the threaded hole (104), and the handwheel is used to abut against the second cylinder section (213).

4. A gas cylinder pressure reducing valve according to claim 3, Characterized in that: The threaded hole (104) and the limiting hole (103) are coaxially arranged, the handwheel is provided with a through hole (501) for the transfer pipe (2) to pass through, and the aperture of the through hole (501) is smaller than the outer diameter of the second cylinder section (213).

5. A gas cylinder pressure reducing valve according to claim 1, Characterized in that: The side of the positioning boss (230) facing the high-pressure hole (102) is conical.

6. A gas cylinder pressure reducing valve according to claim 1, characterized in that: The diversion hole (301) is the inner ring hole of the piston ring (3). The inner ring hole of the piston ring (3) is sleeved on the outer side of the adapter pipe (2), and the diameter of the inner ring hole of the piston ring (3) is larger than the outer diameter of the adapter pipe (2).

7. A gas cylinder pressure reducing valve according to claim 1, characterized in that: A support ring (110) is provided in the middle of the valve cavity. The piston ring (3) passes through the inner ring of the support ring (110). One end of the spring (4) abuts against the support ring (110), and the other end abuts against the outer side wall of the piston ring (3).

8. A gas cylinder pressure reducing valve according to claim 1, characterized in that: A high-pressure sealing ring (320) is provided in the valve cavity located in the high-pressure area (102a). The high-pressure sealing ring (320) abuts against the outer side wall of the piston ring (3); a low-pressure sealing ring (310) is provided in the valve cavity located in the low-pressure area (101a). The low-pressure sealing ring (310) abuts against the outer side wall of the piston ring (3).

9. A gas cylinder pressure reducing valve according to claim 8, characterized in that: The cross-section of the high-pressure sealing ring (320) is S-shaped, and the cross-section of the low-pressure sealing ring (310) is C-shaped.

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