Automatic pressure relief mechanism for gas pressure reduction adjusting valve

Abstract

The utility model belongs to the technical field of pressure regulating equipment, and particularly relates to an automatic pressure relief mechanism for a gas pressure reducing regulating valve, which comprises a valve body and an upper cover, a pressure reducing air hole is arranged on the valve body, a valve seat is arranged below the pressure reducing air hole of the valve body, a bearing seat is arranged in a high-pressure cavity of the valve body, and a pressure reducing valve is arranged on the bearing seat. A first sealing gasket is installed on one side of the bearing seat, a high-pressure spring is installed on the other side of the bearing seat, the first sealing gasket is in contact sealing with the valve seat under the action of the high-pressure spring, and an ejector pin is in threaded connection with the upper portion of the bearing seat. The automatic pressure relief valve has the advantages that the problem that an existing product needs to be provided with a manual pressure relief valve for manual pressure relief is solved, the trouble that when the manual pressure relief valve does not exist, an air outlet pipeline needs to be detached for pressure relief is solved, automatic pressure relief is achieved, excessive pressure relief is avoided, and the automatic pressure relief valve has the advantages of being low in cost, convenient and fast to operate and free of training for operators.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure reducing valves, and in particular relates to an automatic pressure relief mechanism used on a gas pressure reducing regulating valve. Background Art

[0002] Gases used in industrial, medical, or food production plants are typically produced in gas production plants. To facilitate storage and transportation, these gases are compressed and stored in high-pressure cylinders before being delivered to users. When the user needs them, the high-pressure gas stored in the cylinders is decompressed and released for use.

[0003] High-pressure gas must be reduced in pressure by a gas pressure reducing regulating valve before it can be delivered to the gas-using terminal. A sealed gas pipeline connects the high-pressure gas cylinder to the gas pressure reducing regulating valve and then to the gas-using terminal.

[0004] When adjusting the gas pressure reducing regulating valve to the correct output pressure, the user may over-tighten the pressure adjustment knob or wrench, causing the output pressure to be too high. The output pressure needs to be readjusted.

[0005] However, when using a conventional gas pressure reducing regulating valve, once the regulated output pressure is higher than the required pressure, and the gas end does not consume anything else, the pressure at the outlet of the gas pressure reducing regulating valve cannot be reduced. For example, a factory needs to reduce the pressure of a high-pressure gas cylinder to 0.3MPa, but when the user adjusts the pressure, the pressure is often adjusted too much, such as to 0.4MPa, and then the handwheel of the gas pressure reducing regulating valve is loosened to adjust it downward. When the handwheel is loosened, the output force of the pressure regulating spring under the handwheel will decrease, but the 0.4MPa inside the gas pressure reducing regulating valve is already greater than 0.3MPa, and the pressure reducing mechanism in the middle of the gas pressure reducing regulating valve will not open to ventilate it. Even if the pressure reducing mechanism is opened to ventilate it, since the pressure in the high-pressure gas cylinder is much higher than 0.4MPa, the pressure at the outlet of the gas pressure reducing regulating valve will become even higher.

[0006] In order to reduce the pressure at the outlet of the gas pressure reducing regulating valve, unless the outlet of the gas pressure reducing regulating valve uses gas and consumes the gas, thereby reducing the pressure at the outlet of the gas pressure reducing regulating valve, or a manual pressure relief valve is installed on the gas pressure reducing regulating valve and the manual pressure relief valve is manually opened to release the pressure.

[0007] However, in order to save costs, most of the existing gas supply pipelines are not equipped with dedicated pressure relief valves. When the output pressure is readjusted, the closed pipeline must be depressurized to discharge the gas stored when the output pressure was last adjusted. Sometimes the pipeline connection fasteners must be removed and the connection joints must be removed to meet the conditions. Utility Model Content

[0008] In order to overcome the deficiencies of the background technology, the utility model provides an automatic pressure relief mechanism for a gas pressure reducing regulating valve.

[0009] The technical solution of the utility model is: it includes a valve body and an upper cover, the valve body is provided with a decompression air hole, the valve body is provided with a valve seat below the decompression air hole, a socket is installed in the high-pressure cavity of the valve body, a first sealing gasket is installed on one side of the socket, and a high-pressure spring is installed on the other side of the socket, the first sealing gasket contacts and seals with the valve seat under the action of the high-pressure spring, a thimble is threadedly connected above the socket, the thimble extends to the top of the decompression air hole, and the high-pressure spring, socket, first sealing gasket and thimble constitute a decompression mechanism.

[0010] A pressure relief diaphragm assembly is installed on the valve body, and the pressure relief diaphragm assembly consists of a diaphragm, a pressure relief screw, a nut, and a second sealing gasket. A pressure relief hole is provided at the center of the pressure relief screw, and a second sealing gasket is installed at the bottom of the pressure relief screw. An external thread is provided on the top of the pressure relief screw, and a through hole is provided at the center of the diaphragm. The external thread of the pressure relief screw passes through the through hole to the top of the diaphragm, and a nut is threadedly connected to the external thread of the pressure relief screw.

[0011] The diaphragm is made of rubber material, the upper cover is threadedly connected to the valve body, a breathing hole is provided on the upper cover, and the breathing hole is communicated with the outside atmosphere. A pressure regulating spring is installed above the pressure relief diaphragm assembly on the upper cover, and the second sealing gasket is in contact with the ejector pin under the pressure regulating spring.

[0012] Preferably, the second sealing gasket is an O-ring, and the second sealing gasket is adhered to the pressure relief screw through a vulcanization process.

[0013] Preferably, an O-ring groove is provided at the bottom of the pressure relief screw, the O-ring groove is small on the outside and large on the inside, the second sealing gasket is an O-ring, and the second sealing gasket and the O-ring groove match each other.

[0014] Preferably, the diaphragm is made of cloth-reinforced fiber rubber.

[0015] Preferably, an ejector cap is installed at the end of the ejector close to the second sealing gasket, and the outer diameter of the head of the ejector cap is larger than the maximum outer diameter of the second sealing gasket.

[0016] Preferably, a metal washer is installed between the diaphragm and the nut.

[0017] Preferably, the nut is a lock nut.

[0018] The beneficial effect of the utility model is that it solves the problem of existing products requiring manual pressure relief by installing a manual pressure relief valve, solves the trouble of needing to remove the air outlet pipe for pressure relief when there is no manual pressure relief valve, realizes automatic pressure relief, and does not relieve pressure excessively. It has the advantages of low cost, convenient operation, and no need for operator training. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the structure of the present utility model.

[0020] Figure 2-Figure 3 Schematic diagram of the structure of different embodiments of the pressure relief diaphragm assembly of the present invention.

[0021] Figure 4 This is an exploded schematic diagram of the pressure relief diaphragm assembly of the utility model.

[0022] Figure 5 for Figure 1 A partial enlarged view of point A.

[0023] Figure 1-Figure 5 Among them, 1. valve body; 11. valve seat; 12. pressure reducing air hole; 13. high-pressure cavity; 2. pressure relief diaphragm assembly; 21. diaphragm; 211. through hole; 22. pressure relief screw; 221. pressure relief hole; 222. external thread; 23. nut; 24. second sealing gasket; 25. O-ring groove; 3. pressure reducing mechanism; 31. high-pressure spring; 32. seat; 33. first sealing gasket; 34. ejector pin; 35. ejector pin cap; 4. metal gasket; 5. upper cover; 6. breathing hole; 7. pressure regulating spring; 8. handwheel. DETAILED DESCRIPTION

[0024] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings:

[0025] like Figure 1-Figure 5 As shown, this embodiment provides an automatic pressure relief mechanism for a gas pressure reducing regulating valve, including a valve body 1 and an upper cover 5. The valve body 1 is provided with a pressure reducing air hole 12, and the valve body 1 is provided with a valve seat 11 below the pressure reducing air hole 12. A seat 32 is installed in the high-pressure cavity 13 of the valve body 1, and a first sealing gasket 33 is installed on one side of the seat 32, and a high-pressure spring 31 is installed on the other side of the seat 32. The first sealing gasket 33 contacts and seals with the valve seat 11 under the action of the high-pressure spring 31, and a pin 34 is threadedly connected above the seat 32, and the pin 34 extends to the top of the pressure reducing air hole 12. The high-pressure spring 31, the seat 32, the first sealing gasket 33, and the pin 34 constitute a pressure reducing mechanism 3.

[0026] The decompression hole 12 is used for allowing gas to pass through the high-pressure cavity 13 to the low-pressure cavity 14 when the decompression mechanism 3 is opened.

[0027] A pressure relief diaphragm assembly 2 is installed on the valve body 1. The pressure relief diaphragm assembly 2 consists of a diaphragm 21, a pressure relief screw 22, a nut 23, and a second sealing gasket 24. A pressure relief hole 221 is provided at the center of the pressure relief screw 22. A second sealing gasket 24 is installed at the bottom of the pressure relief screw 22. An external thread 222 is provided at the top of the pressure relief screw 22. A through hole 212 is provided at the center of the diaphragm 21. The external thread 222 of the pressure relief screw 22 passes through the through hole 212 to the top of the diaphragm 21. A nut 23 is threadedly connected to the external thread 222 of the pressure relief screw 22.

[0028] The diaphragm 21 is made of rubber material, the upper cover 5 is threadedly connected to the valve body 1, and a breathing hole 6 is provided on the upper cover 5, and the breathing hole 6 is connected to the outside atmosphere. The upper cover 5 is installed with a pressure regulating spring 7 above the pressure relief diaphragm assembly 2, and the second sealing gasket 24 is in contact with the ejector pin 34 under the pressure regulating spring 7.

[0029] When the user adjusts the pressure, the downward force exerted by the diaphragm 21 on the ejector pin 34 is equal to the output force of the pressure-regulating spring 7 minus the upward force exerted by the low-pressure chamber 14 on the diaphragm 21. The direction of the force exerted by the high-pressure spring 31 and the high-pressure chamber 13 on the ejector pin 34 is upward. When the force on the ejector pin 34 is balanced, the pressure reducing mechanism 3 is closed and the air pressure in the low-pressure chamber 14 no longer changes.

[0030] However, when the user turns the handwheel 8 downward, the pressure-regulating spring 7 is compressed, and it is easy to turn it downward too much. The handwheel can be loosened a little. At this time, the pressure-regulating spring 7 extends. Since the pressure reducing mechanism 3 is still closed, the air pressure in the low-pressure chamber 14 remains unchanged. The air pressure in the low-pressure chamber 14 will cause the diaphragm 21 to move upward, so that the second sealing gasket 24 no longer presses on the ejector pin 34. The gas in the low-pressure chamber 14 will leak to the top of the diaphragm 21 through the pressure relief hole 221. In addition, there is a breathing hole 6 on the upper cover 5, so the gas in the low-pressure chamber 14 escapes into the atmosphere through the pressure relief hole 221 and the breathing hole 6.

[0031] As the air pressure in the low-pressure chamber 14 decreases, the diaphragm 21 moves downward, so that the force received by the ejector pin 34 is balanced again, and the air pressure in the low-pressure chamber 14 no longer decreases.

[0032] It solves the problem of existing products requiring manual pressure relief by installing a manual pressure relief valve, and solves the trouble of having to remove the air outlet pipe for pressure relief when there is no manual pressure relief valve. It realizes automatic pressure relief without over-pressure relief, and has the advantages of low cost, easy operation, and no need for operator training.

[0033] Preferably, the second sealing gasket 24 is an O-ring, which is bonded to the pressure relief screw 22 through a vulcanization process. O-rings are inexpensive to purchase and are available in almost all sizes. The vulcanization process can completely bond the O-ring to the pressure relief screw 22, preventing the second sealing gasket 24 from falling off.

[0034] Since the second sealing gasket 24 has a service life, in order to facilitate the replacement of the second sealing gasket 24, preferably, an O-ring groove 25 is provided at the bottom of the pressure relief screw 22, the O-ring groove 25 is small on the outside and large on the inside, and the second sealing gasket 24 is an O-ring, and the second sealing gasket 24 and the O-ring groove 25 match each other.

[0035] The O-ring groove 25 can be processed by a circular groove cutter, with a small outside and a large inside. When installing, press the O-ring hard to deform the O-ring so that it enters the O-ring groove 25. Once the O-ring is installed, it cannot fall off by itself. If it needs to be replaced, just use a knife to cut the O-ring and take it out.

[0036] In order to increase the service life of the diaphragm 21, preferably, the diaphragm 21 is made of cloth-reinforced fiber rubber.

[0037] To reduce the processing cost of the ejector pin 34, a pin cap 35 is preferably installed on the end of the ejector pin 34 near the second gasket 24. The outer diameter of the head of the ejector cap 35 is larger than the maximum outer diameter of the second gasket 24. This reduces the need to design the head of the ejector pin 34 to be so large, and the split structure helps reduce mass production and installation costs.

[0038] In order to prevent the pressure-regulating spring 7 from puncturing the diaphragm 21 , preferably, a metal washer 4 is installed between the diaphragm 21 and the nut 23 .

[0039] In order to prevent the nut 23 from loosening by itself, preferably, the nut 23 is a locking nut.

[0040] During the process of continuously reducing the pressure and outputting gas, the pressure relief screw 22 and the end face of the ejector cap 35 are always in close contact, and the end face sealing O-ring is also always in a compressed and sealed state, so the pressure relief hole 221 is also always in a closed state. If the output gas circuit is suspended or the outlet valve is closed, the pressure in the low-pressure chamber rises, pushing the diaphragm 21 upward. The high-pressure spring 31 rebounds, and the gas pressure in the high-pressure chamber 13 acts on the seat 32, causing the first sealing gasket 33 to close to the valve seat 11, and the high-pressure chamber 13 stops discharging gas. At this time, the rebound force of the regulating spring 7 can still make the end face of the pressure relief screw 22 fit tightly with the end face of the ejector cap 35, the end face sealing O-ring is still in a compressed state, and the pressure relief hole 221 is still in a closed state.

[0041] If the output pressure is accidentally set too high during the initial pressure adjustment, retract the pressure adjustment knob 8 several turns, which retracts the adjustment screw 9. This causes the pressure relief screw 22 to separate from the end face of the ejector cap 35. Simultaneously, the end face sealing O-ring separates from the end face of the ejector cap 35 and resets, opening the pressure relief hole 221. Gas in the low-pressure chamber 14 is discharged through the pressure relief hole 221 into the outer chamber of the upper cover 5 and then out of the gas pressure reducing adjustment valve through the two breathing holes 6 in the upper cover. This achieves automatic pressure relief without the need to manually open the pressure relief valve or remove piping.

[0042] No matter how many times the pressure is adjusted, it can operate normally. If the pressure is adjusted high, just loosen the handwheel 8 a little. If the pressure is too low, just tighten the handwheel 8 a little.

[0043] This utility model patent is the first to invent that a pressure relief hole 221 is set on the diaphragm assembly, that is, when the pressure relief diaphragm assembly 2 and the pressure reducing mechanism 3 are not in contact, the pressure relief hole 221 is in a normally open state, and the residual gas in the low-pressure chamber can be automatically emptied without opening the pressure relief valve; when the pressure reducing mechanism is working normally or stops working, the pressure relief hole 221 is in a closed state, which does not affect the normal continuous operation and start and stop of the gas adjustment.

[0044] The function of this utility model patent is:

[0045] 1. In the entire gas supply system pipeline, there is no need to configure a separate pressure relief valve to achieve the purpose of automatic pressure relief and realize the function of automatic pressure relief;

[0046] 2. When the output pressure is not adjusted properly for the first time (the adjusting handwheel is turned too far, resulting in overpressure), and the output pressure needs to be adjusted a second time, there is no need to open the pressure relief valve to release the pressure (the pressure relief valve must be closed after the pressure relief is completed), and there is no need to disassemble the pipe joints. You only need to turn the handwheel back a few times to perform a second or multiple pressure adjustments in a short time. This is convenient and quick, and can better meet some working conditions that require precise output pressure.

[0047] 3. Because the secondary pressure regulation is convenient and quick, it can largely avoid the situation where some users tolerate the output pressure of the first adjustment being slightly higher than the correct value without making a second adjustment due to the inconvenience of the second pressure regulation and use it as is.

[0048] This embodiment should not be regarded as a limitation of the utility model, but any improvement based on the spirit of the utility model should be within the scope of protection of the utility model.

Claims

1. An automatic pressure relief mechanism for a gas pressure reducing regulating valve, comprising a valve body (1) and an upper cover (5), characterized in that: The valve body (1) is provided with a pressure reducing air hole (12), and the valve body (1) is provided with a valve seat (11) below the pressure reducing air hole (12). A seat (32) is installed in the high-pressure cavity (13) of the valve body (1), a first sealing gasket (33) is installed on one side of the seat (32), and a high-pressure spring (31) is installed on the other side of the seat (32). The first sealing gasket (33) contacts and seals with the valve seat (11) under the action of the high-pressure spring (31). A pin (34) is threadedly connected above the seat (32), and the pin (34) extends to the top of the pressure reducing air hole (12). The high-pressure spring (31), the seat (32), the first sealing gasket (33), and the pin (34) constitute a pressure reducing mechanism (3); A pressure relief diaphragm assembly (2) is installed on the valve body (1), and the pressure relief diaphragm assembly (2) consists of a diaphragm (21), a pressure relief screw (22), a nut (23), and a second sealing gasket (24). A pressure relief hole (221) is provided at the center of the pressure relief screw (22), and a second sealing gasket (24) is installed at the bottom of the pressure relief screw (22). An external thread (222) is provided on the top of the pressure relief screw (22), and a through hole (212) is provided at the center of the diaphragm (21). The external thread (222) of the pressure relief screw (22) passes through the through hole (212) to the top of the diaphragm (21), and a nut (23) is threadedly connected to the external thread (222) of the pressure relief screw (22); The diaphragm (21) is made of rubber material. The upper cover (5) is threadedly connected to the valve body (1). A breathing hole (6) is provided on the upper cover (5). The breathing hole (6) is communicated with the outside atmosphere. A pressure regulating spring (7) is installed on the upper cover (5) above the pressure relief diaphragm assembly (2). The second sealing gasket (24) contacts the ejector pin (34) under the pressure regulating spring (7).

2. The automatic pressure relief mechanism for a gas pressure reducing regulating valve according to claim 1, characterized in that: The second sealing gasket (24) is an O-ring, and the second sealing gasket (24) is adhered to the pressure relief screw (22) through a vulcanization process.

3. The automatic pressure relief mechanism for a gas pressure reducing regulating valve according to claim 1, characterized in that: An O-ring groove (25) is provided at the bottom of the pressure relief screw (22), wherein the O-ring groove (25) is small on the outside and large on the inside. The second sealing gasket (24) is an O-ring, and the second sealing gasket (24) and the O-ring groove (25) match each other.

4. The automatic pressure relief mechanism for a gas pressure reducing regulating valve according to claim 1, characterized in that: The diaphragm (21) is made of cloth-reinforced fiber rubber.

5. The automatic pressure relief mechanism for a gas pressure reducing regulating valve according to claim 1, characterized in that: An ejector cap (35) is installed at the end of the ejector pin (34) close to the second sealing gasket (24), and the outer diameter of the head of the ejector cap (35) is larger than the maximum outer diameter of the second sealing gasket (24).

6. The automatic pressure relief mechanism for a gas pressure reducing regulating valve according to claim 1, characterized in that: A metal washer (4) is installed between the diaphragm (21) and the nut (23).

7. An automatic pressure relief mechanism for a gas pressure reducing regulating valve according to any one of claims 1 to 6, characterized in that: The nut (23) is a locking nut.

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