Gas pressure regulating valve

Abstract

The utility model relates to the technical field of pressure regulating valves, in particular to a gas pressure regulating valve which comprises an upper shell, a lower shell and a three-way pipe, the upper shell is provided with a flow channel and a mixing cavity, the flow channel is communicated with the three-way pipe, a first pressure regulating structure used for primary pressure regulation is arranged in the upper shell, and a second pressure regulating structure used for secondary pressure regulation is arranged in the lower shell. A first pressure regulating structure used for secondary pressure regulation is arranged in the upper shell, a second pressure regulating structure used for secondary pressure regulation is arranged in the lower shell, the mixing chamber is communicated with the interior of the upper shell through a pressure release valve and is provided with a connecting pipe a and a connecting pipe b, the connecting pipe a is connected to the lower shell, and the connecting pipe b is connected to a three-way pipe. The two pressure regulating structures are combined to form a pressure reducing structure, so that the pressure resistance and the safety are effectively improved, the pressure regulating range is expanded, and the pressure can be reduced in a large range at a time.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure regulating valves, and in particular to a gas pressure regulating valve. Background Technology

[0002] A pressure regulating valve, also known as a pressure reducing valve, is a device used to regulate and control fluid pressure. Existing pressure regulating valves reduce the inlet pressure of gas to a desired outlet pressure through the adjustment of a screw and pressure spring. The outlet pressure is then automatically maintained stable by relying on the energy of the gas itself. From a fluid mechanics perspective, a pressure regulating valve is a throttling element with variable local resistance. That is, by changing the flow area, the flow velocity and kinetic energy of the gas are altered, resulting in different pressure losses, thereby achieving pressure reduction. Then, through the adjustment of the control and regulation system, the fluctuations in the downstream pressure are balanced with the spring force, keeping the downstream pressure constant within a certain error range.

[0003] However, when the pressure reduction is too large, the valve needs to be closed quickly or the opening needs to be adjusted significantly, which can easily lead to lag in spring response and sudden fluctuations in flow. Therefore, the adjustable range of existing pressure regulating valves is small and cannot reduce pressure by a large range at once. Currently, the industry can only solve this problem by installing a secondary pressure reducing structure, but such installation, commissioning and maintenance are very troublesome and require a high level of professional technical expertise. Utility Model Content

[0004] The present invention provides a gas pressure regulating valve to solve the above-mentioned problems and achieve the purpose of expanding the pressure regulating range.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a gas pressure regulating valve, comprising an upper shell, a lower shell, and a three-way pipe. The upper shell has a flow channel and a mixing chamber. The flow channel is connected to the three-way pipe. The upper shell is provided with a first pressure regulating structure for primary pressure regulation. The lower shell is provided with a second pressure regulating structure for secondary pressure regulation. The mixing chamber is connected to the interior of the upper shell through a pressure relief valve and is provided with an a connecting pipe and a b connecting pipe. The a connecting pipe is connected to the lower shell, and the b connecting pipe is connected to the three-way pipe.

[0006] Furthermore, the system comprises a first pressure regulating diaphragm, a first pressure spring, a first spring plate, a first pressure adjusting screw, a first diaphragm fixing seat, a first diaphragm transmission lever, a first pressure reducing pad, a valve port, and a pressure relief valve. The first pressure spring is located on top of the first pressure regulating diaphragm. The first screw fixing bracket is located on top of the upper housing. The first pressure adjusting screw is movably mounted on top of the upper housing via the first screw fixing bracket. The first spring plate is located at the bottom of the first pressure adjusting screw and abuts against the top of the first pressure spring. The first diaphragm fixing seat is located at the bottom of the first pressure regulating diaphragm and is movably connected to the first diaphragm transmission lever. The valve port is detachably connected to the b connecting pipe. The first pressure reducing pad is located inside the valve port and connected to the first diaphragm transmission lever.

[0007] Furthermore, the first diaphragm fixing seat includes a pull ring, a fixing post, and a spring. The spring and the pull ring are both inserted through the fixing post. The top of the fixing post is connected to the center of the first pressure regulating diaphragm. The pull ring abuts against the bottom of the first pressure regulating diaphragm. The bottom of the pull ring is connected to the first diaphragm transmission lever via a pin.

[0008] Furthermore, the system includes a second pressure regulating diaphragm, a second pressure spring, a second spring plate, a second pressure adjusting screw, a second diaphragm fixing seat, a second diaphragm transmission lever, and a second pressure reducing pad. The second pressure regulating diaphragm is positioned between the upper and lower housings, thus dividing the upper and lower housings into upper and lower sections. The second diaphragm fixing seat is positioned on top of the second pressure regulating diaphragm and is movably connected to the second diaphragm transmission lever. The second pressure reducing pad is detachably positioned within the flow channel. The second diaphragm transmission lever is connected to the second pressure reducing pad. The top of the second pressure spring abuts against the second pressure regulating diaphragm, and the bottom abuts against the second spring plate. The second spring plate is movably positioned at the bottom of the lower housing via a spring adjusting nut. The second pressure adjusting screw is connected to the bottom of the second diaphragm fixing seat.

[0009] Furthermore, a second pressure regulating diaphragm fastening spring is sleeved on the top of the second pressure regulating screw, and the second pressure regulating diaphragm fastening spring abuts against the bottom of the second pressure regulating diaphragm.

[0010] Furthermore, the second pressure-reducing pad is connected to a pull rod, and the second diaphragm transmission lever is connected to the pull rod via a pin.

[0011] Furthermore, the upper housing has an opening and a feedback port.

[0012] Compared with the prior art, the beneficial effects of this utility model are: by setting the first voltage regulating structure and the second voltage regulating structure, the combination of the two voltage regulating structures is used to form a pressure reducing structure, which effectively improves the pressure resistance and safety, expands the voltage regulating range, and enables it to reduce pressure over a large range at one time;

[0013] The first pressure regulating screw of the first pressure regulating structure controls the generation of an intermediate pressure, and the size of the valve port of the second pressure regulating structure is controlled by this intermediate pressure. This improves the range of pressure reduction in one operation, simplifies pipeline layout and debugging. After the input gas enters the valve body, the pressure is reduced, which effectively improves the pressure resistance, safety, precise pressure control and fast response speed. It solves the problem of poor pressure accuracy in traditional pressure regulating valves where the pressure feedback device is inside the valve body. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a split diagram of the first voltage regulating structure in this utility model.

[0016] Figure 3 This is a schematic diagram of the structure of the first diaphragm fixing seat in this utility model.

[0017] Figure 4 This is a split diagram of the second voltage regulating structure in this utility model.

[0018] Figure 5 This is a schematic diagram of the structure of the second diaphragm fixing seat in this utility model.

[0019] Figure 6 This is a schematic diagram of the structure of the lower shell in this utility model.

[0020] Figure 7 This is a schematic diagram of the connection of the mixing chamber in this utility model.

[0021] In the diagram: 1. Upper housing; 2. Lower housing; 3. T-connector; 4. a connecting pipe; 5. b connecting pipe; 61. First pressure regulating diaphragm; 62. First pressure spring; 63. First spring plate; 64. First pressure adjusting screw; 65. First diaphragm fixing seat; 66. First diaphragm transmission lever; 68. First pressure reducing pad; 71. Second pressure regulating diaphragm; 72. Second pressure spring; 73. Second spring plate; 74. Second pressure adjusting screw; 75. Second diaphragm fixing seat; 76. Second diaphragm transmission lever; 77. Second pressure reducing pad; 100. Flow channel; 651. Pull ring; 652. Fixing post; 680. Valve port; 690. Pressure relief valve; 771. Pull rod. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] As shown in the attached figure, this utility model discloses a gas pressure regulating valve, comprising an upper housing 1, a lower housing 2, and a three-way pipe 3. The upper housing 1 has a flow channel 100 and a mixing chamber. The flow channel 100 is connected to the three-way pipe 3. The upper housing 1 is provided with a first pressure regulating structure for primary pressure regulation. The lower housing 2 is provided with a second pressure regulating structure for secondary pressure regulation. The mixing chamber is connected to the interior of the upper housing 1 through a pressure relief valve 690 and is provided with an a connecting pipe 4 and a b connecting pipe 5. The a connecting pipe 4 is connected to the lower housing 2, and the b connecting pipe 5 is connected to the three-way pipe 3.

[0024] Specifically, the first pressure regulating structure includes a first pressure regulating diaphragm 61, a first pressure spring 62, a first spring plate 63, a first pressure adjusting screw 64, a first diaphragm fixing seat 65, a first diaphragm transmission lever 66, a first pressure reducing pad 68, a valve port 680, and a pressure relief valve 690; the second pressure regulating structure includes a second pressure regulating diaphragm 71, a second pressure spring 72, a second spring plate 73, a second pressure adjusting screw 74, a second diaphragm fixing seat 75, a second diaphragm transmission lever 76, and a second pressure reducing pad 77. The upper housing 1 has an opening and a feedback port, which is a safety structure characteristic of existing pressure regulating valves.

[0025] Specifically, the system includes a first pressure regulating diaphragm 61, a first pressure spring 62, a first spring plate 63, a first pressure adjusting screw 64, a first diaphragm fixing seat 65, a first diaphragm transmission lever 66, a first pressure reducing pad 68, a valve port 680, and a pressure relief valve 690. The first pressure spring 62 is located on top of the first pressure regulating diaphragm 61. The first screw fixing bracket 67 is located on top of the upper housing 1. The first pressure adjusting screw 64 is movably mounted on top of the upper housing 1 via the first screw fixing bracket 67. The first spring plate 63 is located at the bottom of the first pressure adjusting screw 64 and abuts against the top of the first pressure spring 62. The first diaphragm... A fixed seat 65 is disposed at the bottom of the first pressure regulating diaphragm 61 and is movably connected to the first diaphragm transmission lever 66. The valve port 680 is detachably connected to the b connecting pipe 5. The first pressure reducing gasket 68 is disposed inside the valve port 680 and connected to the first diaphragm transmission lever 66. The first diaphragm fixed seat 65 includes a pull ring 651, a fixed post 652 and a spring. The spring and the pull ring 651 are both inserted through the fixed post 652. The top of the fixed post 652 is connected to the center of the first pressure regulating diaphragm 61. The pull ring 651 abuts against the bottom of the first pressure regulating diaphragm 61. The bottom of the pull ring 651 is connected to the first diaphragm transmission lever 66 by a pin.

[0026] The system comprises a second pressure regulating diaphragm 71, a second pressure spring 72, a second spring plate 73, a second pressure adjusting screw 74, a second diaphragm fixing seat 75, a second diaphragm transmission lever 76, and a second pressure reducing pad 77. The second pressure regulating diaphragm 71 is disposed between the upper housing 1 and the lower housing 2, thereby dividing the upper housing 1 and the lower housing 2 into upper and lower sections. The second diaphragm fixing seat 75 is disposed on the top of the second pressure regulating diaphragm 71 and is movably connected to the second diaphragm transmission lever 76. The second pressure reducing pad 77 is detachably disposed within the flow channel 100. The second diaphragm transmission lever 76 is connected to the second pressure reducing pad. The second pressure spring 72 abuts against the second pressure regulating diaphragm 71 at the top and against the second spring pressure plate 73 at the bottom. The second spring pressure plate 73 is movably mounted on the bottom of the lower housing 2 via a spring adjusting nut. The second pressure adjusting screw 74 is connected to the bottom of the second diaphragm fixing seat 75. The second pressure adjusting screw 74 is fitted with a second pressure regulating diaphragm 71 fastening spring at the top, and the second pressure regulating diaphragm 71 fastening spring abuts against the bottom of the second pressure regulating diaphragm 71. The second pressure reducing pad 77 is connected to a pull rod 771, and the second diaphragm transmission lever 76 is connected to the pull rod 771 via a pin.

[0027] The working principle and effect of this utility model of a gas pressure regulating valve are as follows: When the outlet pressure is lower than the pressure set value, under the action of the first pressure regulating spring, the first pressure regulating diaphragm 61 moves downward, driving the first diaphragm transmission lever 66 to swing around the pin shaft through the first diaphragm fixing seat 65. Through the lever movement, the first pressure reducing gasket 68 is disengaged from the valve port 680. After passing through the valve port 680, the gas enters the lower housing 2 through the connecting pipe a, i.e., below the second pressure regulating diaphragm 71, causing the driving pressure inside the lower housing 2 to increase. This causes the second pressure regulating diaphragm 71 to move upward, driving the second diaphragm transmission lever 76 to move upward. The second diaphragm transmission lever 76 swings around the pin shaft, causing the pressure reducing gasket to move and disengage from the flow channel 100, connecting the flow channel 100 and the three-way pipe 3, allowing more gas to flow through the flow channel 100 into the downstream pipeline; at the same time, the gas will enter the upper housing 1 through the pressure relief valve 690. The outlet pressure is compatible with that of the upper housing 1. When the gas flow rate reaches the downstream gas demand, the outlet pressure increases. Since the lower part of the first pressure regulating diaphragm 61 is connected to the downstream pipeline through the feedback port, the pressure below the first pressure regulating diaphragm 61 increases, causing the first pressure regulating diaphragm 61 to move upward, thereby causing the pressure reducing pad to move again, gradually blocking the flow channel 100. The first adjusting nut plays a fixing and guiding role. The second adjusting screw passes through the second pressure regulating diaphragm 71, and a small spring is sleeved on the second adjusting screw. It is used to press against the bottom of the second pressure regulating diaphragm 71. The second adjusting screw and the second adjusting nut are connected by threads. By turning the second adjusting nut, its up and down movement can adjust the elasticity of the second pressure regulating spring. The second diaphragm fixing seat 75 is used to support the second diaphragm transmission lever 76. The first adjusting nut presses against the first pressure regulating spring. The first adjusting nut and the first adjusting screw are connected by threads. By rotating the first adjusting screw, the elasticity of the first pressure regulating spring can be adjusted.

[0028] By combining the first and second pressure regulating structures, a pressure-reducing structure is formed, effectively improving pressure resistance and safety, expanding the pressure regulating range, and increasing the range of one-time pressure reduction, enabling large-scale pressure reduction in a single operation. The first pressure regulating screw 64 of the first pressure regulating structure generates an intermediate pressure, which is then used to control the size of the valve port 680 of the second pressure regulating structure, further increasing the range of one-time pressure reduction. This simplifies pipeline layout and debugging. Pressure reduction occurs after the input gas enters the valve body, effectively improving pressure resistance, safety, precise pressure control, and rapid response speed. This solves the problem of poor pressure accuracy in traditional pressure regulating valves where the pressure feedback device is located inside the valve housing.

[0029] The above embodiments are preferred embodiments of this utility model. All structures similar to this utility model and equivalent changes thereof should fall within the protection scope of this utility model.

Claims

1. A gas pressure regulating valve, characterized in that: It includes an upper shell, a lower shell, and a three-way pipe. The upper shell has a flow channel and a mixing chamber. The flow channel is connected to the three-way pipe. The upper shell is equipped with a first pressure regulating structure for primary pressure regulation. The lower shell is equipped with a second pressure regulating structure for secondary pressure regulation. The mixing chamber is connected to the interior of the upper shell through a pressure relief valve and is equipped with an a connecting pipe and a b connecting pipe. The a connecting pipe is connected to the lower shell, and the b connecting pipe is connected to the three-way pipe.

2. A gas pressure regulating valve according to claim 1, characterized in that: The system comprises a first pressure regulating diaphragm, a first pressure spring, a first spring plate, a first pressure adjusting screw, a first diaphragm fixing seat, a first diaphragm transmission lever, a first screw fixing bracket, a first pressure reducing gasket, a valve port, and a pressure relief valve. The first pressure spring is located on top of the first pressure regulating diaphragm. The first screw fixing bracket is located on top of the upper housing. The first pressure adjusting screw is movably mounted on top of the upper housing via the first screw fixing bracket. The first spring plate is located at the bottom of the first pressure adjusting screw and abuts against the top of the first pressure spring. The first diaphragm fixing seat is located at the bottom of the first pressure regulating diaphragm and is movably connected to the first diaphragm transmission lever. The valve port is detachably connected to the connecting pipe b. The first pressure reducing gasket is located inside the valve port and connected to the first diaphragm transmission lever.

3. A gas pressure regulating valve according to claim 2, characterized in that: The first diaphragm fixing seat includes a pull ring, a fixing post, and a spring. The spring and the pull ring are both inserted through the fixing post. The top of the fixing post is connected to the center of the first pressure regulating diaphragm. The pull ring abuts against the bottom of the first pressure regulating diaphragm. The bottom of the pull ring is connected to the first diaphragm transmission lever through a pin.

4. A gas pressure regulating valve according to claim 1, characterized in that: The system comprises a second pressure regulating diaphragm, a second pressure spring, a second spring plate, a second pressure adjusting screw, a second diaphragm fixing seat, a second diaphragm transmission lever, and a second pressure reducing pad. The second pressure regulating diaphragm is disposed between the upper and lower housings, thereby dividing the upper and lower housings into upper and lower sections. The second diaphragm fixing seat is disposed on the top of the second pressure regulating diaphragm and is movably connected to the second diaphragm transmission lever. The second pressure reducing pad is detachably disposed within the flow channel. The second diaphragm transmission lever is connected to the second pressure reducing pad. The top of the second pressure spring abuts against the second pressure regulating diaphragm, and the bottom abuts against the second spring plate. The second spring plate is movably disposed at the bottom of the lower housing via a spring adjusting nut. The second pressure adjusting screw is connected to the bottom of the second diaphragm fixing seat.

5. A gas pressure regulating valve according to claim 4, characterized in that: The second pressure adjusting screw is fitted with a second pressure adjusting diaphragm fastening spring, which abuts against the bottom of the second pressure adjusting diaphragm.

6. A gas pressure regulating valve according to claim 4, characterized in that: The second pressure-reducing pad is connected to a pull rod, and the second diaphragm transmission lever is connected to the pull rod via a pin.

7. A gas pressure regulating valve according to claim 1, characterized in that: The upper housing has an opening and a feedback port.

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