A gas pressure regulating valve

Abstract

The present invention relates to a gas pressure regulating valve, comprising a valve body and a pressure regulating chamber connected to the valve body, the pressure regulating chamber is divided into an upper chamber and a lower chamber by a diaphragm, a lever connected to the diaphragm is arranged in the lower chamber, an air inlet channel, an air outlet channel and a bracket are arranged in the valve body, a valve stem, a valve core connected to the valve stem and a first valve seat are arranged in the air outlet channel, the valve stem is connected to the lever, one end of the first valve seat away from the valve core extends into the air inlet channel, a second valve seat is fixedly arranged in the air inlet channel, when the lever presses the valve stem toward the valve body, the two ends of the first valve seat respectively contact the valve core and the second valve seat, and a reset spring is also arranged in the air inlet channel. By adopting the above technical scheme, the present invention provides a gas pressure regulating valve, the gas pressure regulating valve is provided with double sealing, so that the valve core and the valve seat are completely sealed, so as to achieve good sealing, and the first valve seat can automatically reset under the action of the reset spring.

Description

Technical Field

[0001] The invention relates to a gas pressure regulating valve. Background Art

[0002] Gas pressure regulator, commonly known as gas pressure reducing valve, is a device that automatically changes the throttling area of ​​the throttle port of the pressure regulator to reduce the system pressure to a certain range, and must also meet the downstream flow requirements. It is usually divided into two types: direct-acting and indirect-acting. When the downstream user has no flow demand, the valve core of the pressure regulator is close to the valve seat, narrowing the channel to limit the flow. When the downstream flow increases, the valve core moves away from the valve seat, increasing its opening degree and increasing the flow. From the perspective of fluid mechanics, the pressure regulator is a throttling element with variable local resistance, that is, by changing the throttling area, the flow rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving the purpose of pressure reduction. Then, relying on the control system (mainly composed of the main diaphragm and the main spring) and the adjustment system (mainly referring to the main valve stem connected to the diaphragm and the lever, valve stem, valve core, throttle port, etc. connected to it) to adjust, the downstream pressure is maintained at a relatively stable value.

[0003] The gas pressure regulator should be able to reduce the upstream pressure to a stable downstream pressure; at the same time, when there is no flow demand downstream, the upstream high-pressure gas cannot leak into the downstream low-pressure gas to avoid overpressure downstream, that is, the closing pressure must be within a certain range, which requires the valve core and valve seat of the pressure regulator to have a good fit in order to close tightly. The valve cores of existing gas regulating devices are all rigidly connected. Due to manufacturing and assembly errors and wear during long-term use, it is very easy to cause the fit between the valve core and the valve seat to decrease, resulting in poor sealing, so that the valve core and the valve seat cannot be completely sealed, and it is easy to leak. Summary of the invention

[0004] Purpose of the invention: In order to overcome the defects of the prior art, the present invention provides a gas pressure regulating valve, which is provided with double seals, so that even if the valve core is worn to a certain extent after long-term use or foreign matter is stuck in the valve seat, the valve core and the valve seat can be completely sealed, thereby achieving good sealing and not easy to leak. When the pressure in the lower chamber drops to normal pressure, the slidable first valve seat returns to the normal working position under the action of the reset spring, and the normal pressure regulator function can be achieved without manual reset.

[0005] The technical solution of the present invention is as follows: a gas pressure regulating valve comprises a valve body and a pressure regulating chamber connected to the valve body, the pressure regulating chamber is divided into an upper chamber and a lower chamber by a diaphragm, the diaphragm is provided with a diaphragm disk, the lower chamber is provided with a lever connected to the diaphragm, the lever is hingedly arranged on the inner wall of the lower chamber, the valve body is provided with an air inlet channel, an air outlet channel and a bracket, the bracket is provided with a valve port connecting the air outlet channel and the air inlet channel, the air outlet channel is communicated with the lower chamber, the air outlet channel is provided with a valve stem, a valve core connected to the valve stem and a first valve seat, the valve stem is connected to the lever, and the first valve seat is slidably arranged on the bracket, when the pressure value in the lower chamber rises, the diaphragm bulges upward, one end of the lever connected to the diaphragm rises accordingly, and the other end presses the valve stem toward the valve body so that the valve core presses against the first valve seat. The valve is closed by the touch, and is characterized in that one end of the first valve seat away from the valve core passes through the valve port and extends into the air inlet passage, and a second valve seat is fixedly provided in the air inlet passage, and the second valve seat is arranged opposite to the first valve seat. When the lever presses the valve stem in the direction of the valve body, one end of the first valve seat conflicts with the valve core, and the other end conflicts with the second valve seat, so that the air inlet passage and the air outlet passage can be cut off to achieve the closing of the valve. A return spring is also provided in the air inlet passage, one end of the return spring is sleeved on the first valve seat, and the other end is sleeved on the second valve seat. The pressure value in the lower cavity decreases, the diaphragm is concave, and the end of the lever connected to the diaphragm decreases accordingly, and the other end drives the valve stem to slide toward the lower cavity, so that the valve core is separated from the first valve seat, and the first valve seat is separated from the second valve seat under the action of the return spring, so that the valve opens.

[0006] When the diaphragm is lifted up, the pressure in the diaphragm will increase, and when it reaches a certain value, the diaphragm will bulge upward, driving the lever to rise together. Since the lever is hinged on the inner wall of the lower chamber, the other end of the lever will press toward the valve body, and the valve stem connected to the lever will also move accordingly, driving the valve core on the valve stem to move toward the first valve seat and conflict with the first valve seat. In this way, the valve can be closed, and the gas cannot flow out of the gas outlet channel. In addition, the first valve seat will move toward the second valve seat under the force of the valve core, so that the first valve seat not only conflicts with the valve core, but also conflicts with the second valve seat in the gas inlet channel. In this way, double sealing has better sealing performance, which solves the problem that only the first valve seat and the valve core conflict in the prior art, and the first valve seat will be worn after long-term use, which may cause the first valve seat and the valve core to be not sealed and gas leak.

[0007] The present invention is further configured as follows: a sealing gasket is sleeved on a side of the second valve seat facing the first valve seat, and the first valve seat abuts against the sealing gasket to form a valve seal.

[0008] With the above further arrangement, a sealing gasket is sleeved on the second valve seat, so that when the first valve seat and the second valve seat collide with each other, the sealing is better, preventing the gas from leaking from between the two valve seats.

[0009] The present invention is further configured as follows: a mounting seat is provided in the air outlet channel, one end of the mounting seat extends into the valve port, the first valve seat is slidably arranged on the mounting seat, a positioning baffle is provided on the first valve seat extending into the air inlet channel, after the first valve seat is reset, the positioning baffle is in conflict with the mounting seat, and a first sealing ring is provided between the first valve seat and the mounting seat.

[0010] With the above-mentioned further arrangement, the arrangement of the mounting seat makes the first valve seat more stable when sliding, plays a guiding role, and will not deviate, and has better sealing with the second valve seat and the valve core. When the first valve seat is reset, the positioning baffle is abutted against the mounting seat, so that the first valve seat will not be over-reset, which is not conducive to the next valve closing. The arrangement of the first sealing ring improves the sealing between the first valve seat and the mounting seat, and the gas will not leak from the gap between the mounting seat and the first valve seat.

[0011] The present invention is further configured as follows: an annular boss is provided on the mounting seat, the annular boss conflicts with a side of the bracket located in the air outlet channel, and a second sealing ring is provided on the outer periphery of the mounting seat, the second sealing ring conflicts with the bracket.

[0012] With the above-mentioned further arrangement, the annular boss is in conflict with the bracket, so that when the valve core moves toward the second valve seat, it can only push the first valve seat to move but cannot push the mounting seat to move. This makes the first valve seat more stable when sliding. The second sealing ring is arranged between the mounting seat and the bracket, so that the mounting seat is installed more stably and has better sealing.

[0013] The present invention is further configured as follows: a shaft rod which contacts the diaphragm is provided in the lower chamber, the lever is connected to the shaft rod, a pressure regulating spring and a regulator are provided in the upper chamber, the regulator is installed in the upper position of the upper chamber, a support seat is provided on the upper surface of the diaphragm disk, the pressure regulating spring is arranged between the support seat and the regulator, a relief valve stem and an indicator rod are also provided in the upper chamber, the indicator rod is arranged on the inner side of the pressure regulating spring, the lower end of the relief valve stem passes through the diaphragm and is connected to the shaft rod, and the upper end of the relief valve stem is connected to the indicator rod.

[0014] With the above-mentioned further arrangement, the diaphragm bulges upward to drive the shaft rod to rise, thereby driving the lever connected to the shaft rod to move in linkage. The linkage between the diaphragm and the lever is more convenient through the connection between the shaft rod and the lever. The regulator and the pressure-regulating spring can be used to adjust the pressure in the pressure-regulating chamber. The function of the indicator rod is that the user can judge the pressure in the pressure-regulating chamber according to the height of the indicator rod.

[0015] The present invention is further configured as follows: a flow limiting ring is provided at one end of the mounting seat close to the valve core, the flow limiting ring is sleeved on the outer periphery of the mounting seat and abuts against the annular boss, a plurality of flow limiting ports are provided at intervals on the flow limiting ring, and the valve core is slidably arranged in the flow limiting ring.

[0016] With the above further arrangement, the flow restriction port can control the flow rate of the gas.

[0017] The present invention is further configured as follows: the pressure regulating chamber comprises an upper shell and a lower shell that are detachably connected, the diaphragm is pressed onto the lower shell via the upper shell, the lower shell and the diaphragm form the lower chamber, the upper shell and the diaphragm form the upper chamber, and the lower shell is connected to the valve body.

[0018] The above-mentioned further arrangement is adopted to install the disassembly and assembly of the components in the pressure regulating chamber.

[0019] The present invention is further provided that: the lower shell is connected to the valve body via a clamping ring, and a third sealing ring is pressed between the lower shell and the valve body.

[0020] By adopting the above-mentioned further arrangement, the connection between the lower shell and the valve body is made more firm and not easy to be damaged. The arrangement of the third sealing ring makes the sealing between the valve body and the pressure regulating chamber good. When the gas enters the lower chamber, it will not leak from the connection between the valve body and the lower shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention;

[0022] Figure 2 It is a top view of a specific embodiment of the present invention;

[0023] Figure 3 for Figure 2 Sectional view in the AA direction;

[0024] Figure 4 It is a left side view of a specific embodiment of the present invention;

[0025] Figure 5 for Figure 4 Cross-sectional view in the BB direction;

[0026] Figure 6 It is a cross-sectional view of the valve body when the valve is closed in a specific embodiment of the present invention;

[0027] Figure 7 for Figure 5 A magnified view of part A;

[0028] Figure 8 It is a cross-sectional view of a valve body according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0029] like Figure 1-8As shown, a gas pressure regulating valve comprises a valve body 1 and a pressure regulating chamber 2 connected to the valve body 1, wherein the pressure regulating chamber 2 is divided into an upper chamber 21 and a lower chamber 22 by a diaphragm 3, wherein a diaphragm disc 31 is provided on the diaphragm 3, wherein a lever 221 connected to the diaphragm 3 is provided in the lower chamber 22, wherein the lever 221 is hingedly arranged on the inner wall of the lower chamber 22, wherein an air inlet channel 11, an air outlet channel 12 and a bracket 13 are provided in the valve body 1, wherein a valve port 131 connecting the air outlet channel 11 and the air inlet channel 12 is provided on the bracket 13, wherein the air outlet channel 11 is connected to the air inlet channel 12 by a diaphragm disc 31, wherein a lever 221 connected to the diaphragm 3 is provided in the lower chamber 22, wherein the lever 221 is hingedly arranged on the inner wall of the lower chamber 22, wherein an air inlet channel 11, an air outlet channel 12 and a bracket 13 are provided in the valve body 1, wherein a valve port 131 connecting the air outlet channel 11 and the air inlet channel 12 is provided on the bracket 13, wherein the air outlet channel 11 is connected to the air outlet channel 12 by a diaphragm disc 31, wherein the lever 221 is hingedly arranged on the inner wall of the lower chamber 2 ... The air channel 12 is communicated with the lower chamber 22, and a valve stem 121, a valve core 122 connected to the valve stem 121, and a first valve seat 123 are arranged in the air outlet channel 12. The valve stem 121 is connected to the lever 221, and the first valve seat 123 is slidably arranged on the bracket 13. When the pressure value in the lower chamber 22 rises, the diaphragm 3 bulges upward, and one end of the lever 221 connected to the diaphragm 3 rises accordingly, and the other end presses the valve stem 121 toward the valve body 1 so that the valve core 122 conflicts with the first valve seat 123, thereby closing the valve. The first valve seat 123 is closed, one end of the first valve seat 123 away from the valve core 122 passes through the valve port 131 and extends into the air inlet channel 11. The air inlet channel 11 is fixedly provided with a second valve seat 111. The second valve seat 111 is arranged opposite to the first valve seat 123. When the lever 221 presses the valve stem 121 toward the valve body 1, one end of the first valve seat 123 conflicts with the valve core 122, and the other end conflicts with the second valve seat 111, so that the air inlet channel 11 and the air outlet channel 12 are cut off to close the valve. The air inlet channel 11 is also provided with a The return spring 112 has one end sleeved on the first valve seat 123 and the other end sleeved on the second valve seat 111. The pressure value in the lower chamber 22 decreases, and the diaphragm 3 is concave. The end of the lever 221 connected to the diaphragm 3 decreases accordingly, and the other end drives the valve stem 121 to slide toward the lower chamber 22, so that the valve core 122 is separated from the first valve seat 123, and the first valve seat 123 is separated from the second valve seat 111 under the action of the return spring 112, so that the valve is opened. This does not require manual reset and is more convenient.After the valve is opened, the gas flows from the gas inlet channel 11 to the gas outlet channel 12, and the lower chamber 22 of the pressure regulating chamber 2 is connected to the gas outlet channel 12, so the gas will flow into the lower chamber 22, so that the pressure value in the lower chamber 22 will rise, and when it rises to a certain value, the diaphragm 3 bulges upward, which will drive the lever 221 to rise together. Because the lever 221 is hingedly arranged on the inner wall of the lower chamber 22, the other end of the lever 221 will press toward the valve body 1, and the valve stem 121 connected to the lever 221 will also move accordingly, which will drive the valve core 122 on the valve stem 121 to move toward the first valve seat 123 and engage with the first valve seat 12 3 conflict with each other, so that the valve can be closed, and the gas cannot flow out of the gas outlet channel 12, and the first valve seat 123 will move toward the second valve seat 111 under the force of the valve core 122, so that the first valve seat 123 not only conflicts with the valve core 122, but also conflicts with the second valve seat 111 in the gas inlet channel 11. In this way, double sealing has better sealing performance, which solves the problem of only the conflict and cooperation between the first valve seat 123 and the valve core 122 in the prior art, and the problem that the valve core will be worn or foreign matter will be stuck on the first valve seat after long-term use, which may easily cause the first valve seat 123 and the valve core 122 to be not sealed and cause gas leakage.

[0030] In this embodiment, a sealing gasket 113 is sleeved on the side of the second valve seat 111 facing the first valve seat 123, and the first valve seat 123 and the sealing gasket 113 are in contact with each other to form a valve seal. The second valve seat 111 is sleeved with a sealing gasket 113, so that when the first valve seat 123 and the second valve seat 111 are in contact with each other, the sealing is better to prevent gas from leaking from between the two valve seats.

[0031] In this embodiment, a mounting seat 124 is provided in the outlet channel 12, one end of the mounting seat 124 extends into the valve port 131, the first valve seat 123 is slidably provided on the mounting seat 124, and a positioning baffle 1231 is provided on the first valve seat 123 extending into the inlet channel 11. After the first valve seat 123 is reset, the positioning baffle 1231 is in conflict with the mounting seat 124, and a first sealing ring 125 is provided between the first valve seat 123 and the mounting seat 124. The setting of the mounting seat 124 makes the first valve seat 123 is more stable when sliding, plays a guiding role, will not deviate, and has better sealing with the second valve seat 111 and the valve core 122. When the first valve seat 123 is reset, the positioning baffle 1231 is set on the mounting seat 124 in abutment, so that the first valve seat 123 will not be over-reset, which is not conducive to the next valve closing. The setting of the first sealing ring 125 ensures good sealing between the first valve seat 123 and the mounting seat 124, and the gas will not leak from the gap between the mounting seat 124 and the first valve seat 123.

[0032] In this embodiment, an annular boss 1241 is provided on the mounting seat 124, and the annular boss 1241 conflicts with the side of the bracket 13 located in the air outlet channel 12, and a second sealing ring 1242 is provided on the outer periphery of the mounting seat 124, and the second sealing ring 1242 conflicts with the bracket 13, and the annular boss 1241 conflicts with the bracket 13, so that when the valve core 122 moves toward the second valve seat 111, it can only push the first valve seat 123 to move, but cannot push the mounting seat 124 to move, so that the first valve seat 123 is more stable when sliding, and the second sealing ring 1242 is arranged between the mounting seat 124 and the bracket 13, so that the installation of the mounting seat 124 is more stable and the sealing is better.

[0033] In this embodiment, the lower chamber 22 is provided with a shaft 222 that contacts the diaphragm 3, the lever 221 is connected to the shaft 222, the upper chamber 21 is provided with a pressure regulating spring 211 and a regulator 212, the regulator 212 is installed at the upper position of the upper chamber 211, the upper surface of the diaphragm disc 31 is provided with a support seat 311, the pressure regulating spring 211 is arranged between the support seat 311 and the regulator 212, the upper chamber 21 is also provided with a release valve stem 213 and an indicator rod 214, the indicator rod 214 is arranged on the pressure regulating spring 21 1, the lower end of the relief valve stem 213 passes through the diaphragm 3 and is connected to the shaft rod 222, the upper end of the relief valve stem 213 is connected to the indicator rod 214, the diaphragm 3 bulges upward to drive the shaft rod 222 to rise, thereby driving the lever 221 connected to the shaft rod 222 to work in conjunction, and the connection between the shaft rod 22 and the lever 221 makes it more convenient to realize the linkage between the diaphragm 3 and the lever 221, the regulator 212 and the pressure regulating spring 211 can be used to adjust the pressure in the pressure regulating chamber 2, and the indicator rod 214 can be used for the user to judge the pressure in the pressure regulating chamber 2 according to the height of the indicator rod 214.

[0034] In this embodiment, a flow limiting ring 126 is provided at one end of the mounting seat 124 close to the valve core 122. The flow limiting ring 126 is sleeved on the outer periphery of the mounting seat 124 and abuts against the annular boss 1241. A plurality of flow limiting ports 1261 are provided at intervals on the flow limiting ring 126. The valve core 123 is slidably disposed in the flow limiting ring 126. The flow limiting ports 1261 can control the flow rate of the gas.

[0035] In this embodiment, the pressure regulating chamber 2 includes a detachable upper shell 23 and a lower shell 24, the diaphragm 3 is pressed onto the lower shell 24 via the upper shell 23, the lower shell 24 and the diaphragm 3 form the lower chamber 22, the upper shell 23 and the diaphragm 3 form the upper chamber 21, the lower shell 24 is connected to the valve body 1, and the upper shell 23 and the lower shell 24 are connected by bolts, so that the components in the pressure regulating chamber 2 can be installed and disassembled.

[0036] In this embodiment, the lower shell body 24 is connected to the valve body 1 via a retaining ring 4, and a third sealing ring 5 is pressed between the lower shell body 24 and the valve body 1. The retaining ring 4 makes the connection between the lower shell body 24 and the valve body 1 more secure and less prone to damage. The provision of the third sealing ring 5 ensures good sealing between the valve body 1 and the pressure regulating chamber 2. When the gas enters the lower chamber 22, it will not leak from the connection between the valve body 1 and the lower shell body 24.

Claims

1. A gas pressure regulating valve, comprising a valve body and a pressure regulating chamber connected to the valve body, the pressure regulating chamber is divided into an upper chamber and a lower chamber by a diaphragm, the diaphragm is provided with a diaphragm disc, the lower chamber is provided with a lever connected to the diaphragm, the lever is hingedly arranged on the inner wall of the lower chamber, the valve body is provided with an air inlet channel, an air outlet channel and a bracket, the bracket is provided with a valve port connecting the air outlet channel and the air inlet channel, the air outlet channel is connected to the lower chamber, the air outlet channel is provided with a valve stem, a valve core connected to the valve stem and a first valve seat, the valve stem is connected to the lever, the first valve seat is slidably arranged on the bracket, when the pressure value in the lower chamber rises, the diaphragm bulges upward, the end of the lever connected to the diaphragm rises accordingly, and the other end presses the valve stem toward the valve body so that the valve core conflicts with the first valve seat, thereby closing the valve, characterized in that One end of the first valve seat away from the valve core extends through the valve port into the air inlet passage, and a second valve seat is fixedly provided in the air inlet passage, and the second valve seat is arranged opposite to the first valve seat. When the lever presses the valve stem in the direction of the valve body, one end of the first valve seat conflicts with the valve core, and the other end conflicts with the second valve seat, so that the air inlet passage and the air outlet passage can be cut off to achieve the closing of the valve. A return spring is also provided in the air inlet passage, one end of the return spring is sleeved on the first valve seat, and the other end is sleeved on the second valve seat. The pressure value in the lower cavity decreases, and the diaphragm is concave. The end of the lever connected to the diaphragm decreases accordingly, and the other end drives the valve stem to slide toward the lower cavity, so that the valve core is separated from the first valve seat, and the first valve seat is separated from the second valve seat under the action of the return spring, so that the valve opens.

2. A gas pressure regulating valve according to claim 1, characterized in that: A sealing gasket is sleeved on the side of the second valve seat facing the first valve seat, and the first valve seat and the sealing gasket are in contact with each other to form a seal of the valve.

3. A gas pressure regulating valve according to claim 1 or 2, characterized in that: A mounting seat is provided in the air outlet channel, one end of the mounting seat extends into the valve port, the first valve seat is slidably arranged on the mounting seat, and a positioning baffle is provided on the first valve seat extending into the air inlet channel. After the first valve seat is reset, the positioning baffle contacts the mounting seat, and a first sealing ring is provided between the first valve seat and the mounting seat.

4. A gas pressure regulating valve according to claim 3, characterized in that: The mounting seat is provided with an annular boss, which conflicts with one side of the bracket in the air outlet passage. The outer periphery of the mounting seat is provided with a second sealing ring, which conflicts with the bracket.

5. A gas pressure regulating valve according to claim 4, characterized in that: The lower chamber is provided with a shaft rod which contacts the diaphragm, the lever is connected to the shaft rod, the upper chamber is provided with a pressure regulating spring and a regulator, the regulator is installed at the upper position of the upper chamber, a support seat is provided on the upper surface of the diaphragm disk, the pressure regulating spring is arranged between the support seat and the regulator, the upper chamber is also provided with a relief valve stem and an indicator rod, the indicator rod is arranged on the inner side of the pressure regulating spring, the lower end of the relief valve stem passes through the diaphragm and is connected to the shaft rod, and the upper end of the relief valve stem is connected to the indicator rod.

6. A gas pressure regulating valve according to claim 5, characterized in that: A flow limiting ring is provided at one end of the mounting seat close to the valve core. The flow limiting ring is sleeved on the outer periphery of the mounting seat and conflicts with the annular boss. A plurality of flow limiting ports are provided at intervals on the flow limiting ring. The valve core is slidably arranged in the flow limiting ring.

7. A gas pressure regulating valve according to claim 6, characterized in that: The pressure regulating chamber comprises an upper shell and a lower shell which are detachably connected. The diaphragm is pressed onto the lower shell via the upper shell. The lower shell and the diaphragm form the lower chamber. The upper shell and the diaphragm form the upper chamber. The lower shell is connected to the valve body.

8. A gas pressure regulating valve according to claim 7, characterized in that: The lower shell is connected to the valve body via a clamping ring, and a third sealing ring is pressed between the lower shell and the valve body.

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