Pressure reducing air valve

Abstract

The pressure reducing air valve comprises a main valve body, an air inlet channel and an air outlet channel are formed in the two ends of the main valve body respectively, a valve rod assembly ascends or descends to achieve blocking or communicating of the air inlet channel and a communicating cavity, and a piston assembly capable of ascending and descending is further arranged in the main valve body. The lower end of the piston assembly makes contact with the valve rod assembly and is used for driving the valve rod assembly to ascend or descend. And the upper cover assembly is used for driving the piston assembly to descend and extruding the valve rod assembly to descend. A diaphragm in the prior art is changed into the piston, the piston is used for driving the valve rod to ascend and descend, compared with the diaphragm, the structural strength is higher, deformation is not prone to occurring, and therefore the trouble of frequent maintenance is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of pressure reducing valves, and in particular to a pressure reducing valve. Background Art

[0002] A pressure reducing valve is an automatic valve that reduces inlet pressure to a desired outlet pressure through regulation, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. The working principle of a pressure reducing valve is to change the throttling area, thereby changing the flow rate and kinetic energy of the fluid, resulting in different pressure losses, thereby achieving the purpose of pressure reduction.

[0003] When the existing pressure reducing valve is in use, a pressure regulating spring is generally used to resist the diaphragm, causing the diaphragm to deform, thereby driving the valve stem to move, so that the air inlet channel and the air outlet channel can be connected, thereby achieving the purpose of diversion and pressure reduction.

[0004] The above-mentioned technical means of utilizing diaphragm deformation to perform operation may cause the diaphragm to wear or deform under high pressure, resulting in insufficient sensitivity of operation and the need to frequently replace the internal diaphragm, which is not convenient to use. Utility Model Content

[0005] The present application provides a pressure reducing gas valve, which can solve the problem that under high pressure conditions, the device has a short service life and requires frequent repair and maintenance, thereby causing inconvenience.

[0006] The technical solution of the present application is as follows: A pressure reducing valve comprising:

[0007] A valve body, wherein an air inlet channel and an air outlet channel are respectively provided at both ends of the valve body, a communication cavity is provided inside the valve body between the air inlet channel and the air outlet channel, the communication cavity is communicated with the air outlet channel, a liftable valve stem assembly is provided between the air inlet channel and the communication cavity, the valve stem assembly rises or falls to achieve blocking or communication between the air inlet channel and the communication cavity, a liftable piston assembly is further provided inside the valve body, the lower end of the piston assembly is in contact with the valve stem assembly, and is used to drive the valve stem assembly to rise or fall;

[0008] The upper cover assembly is used to drive the piston assembly to descend and squeeze the valve stem assembly to descend.

[0009] By adopting the above solution, by replacing the diaphragm in the prior art with a piston and using the piston to drive the valve stem to rise and fall, the structure has higher strength and is not easily deformed compared to the diaphragm, thereby avoiding the trouble of frequent maintenance.

[0010] In one embodiment of the present application, the valve body is provided with a valve cavity extending along the height direction of the valve body below the communicating cavity, and the valve cavity includes:

[0011] a communicating section, the upper end of which is in communication with the communicating cavity;

[0012] The moving section has an upper end connected to the connecting section, a lower end connected to the air inlet passage, and a diameter of the moving section is greater than a diameter of the connecting section.

[0013] In one embodiment of the present application, the valve stem assembly includes:

[0014] a valve stem, the valve stem being disposed inside the communicating section, the upper end of the valve stem penetrating the communicating cavity and contacting the piston assembly, the lower end of the valve stem extending to the connection between the communicating section and the moving section, and being used to block the connection between the communicating section and the moving section;

[0015] A return spring is arranged inside the moving section and below the valve stem. The upper end of the return spring is connected and fixed to the lower end of the valve stem, and the lower end is connected and fixed to the bottom of the moving section.

[0016] By adopting the above solution, the valve stem will not block the communicating section when it descends, so that the communicating cavity can be connected with the air inlet channel, and then the air inlet channel can be connected with the air outlet channel, thereby achieving the purpose of pressure reduction.

[0017] In one embodiment of the present application, the valve body is provided with a piston cavity extending in the height direction of the valve body above the communicating cavity, the piston assembly is provided inside the piston cavity, and the piston cavity includes:

[0018] connecting cavity;

[0019] The movable cavity has an upper end connected to the connecting cavity, and the diameter of the movable cavity is larger than the diameter of the connecting cavity.

[0020] By adopting the above solution, by providing a movable cavity with a diameter larger than that of the connecting cavity, the connecting cavity can abut against the upper end of the piston, thereby limiting the piston and preventing it from falling out of the piston cavity.

[0021] In one embodiment of the present application, the piston assembly includes:

[0022] a piston rod, the piston rod being disposed inside the connecting cavity, the upper end of the piston rod passing through the connecting cavity and in contact with the upper cover assembly;

[0023] The piston block is interference-arranged inside the moving cavity, the upper end of the piston block is connected and fixed to the lower end of the piston rod, and the lower end of the piston block contacts the upper end of the valve stem.

[0024] By adopting the above solution, a piston is set up and the piston rod is used to drive the piston to move up and down, so that the piston drives the valve stem to move, and the air inlet channel and the air outlet channel are connected or disconnected. The overall strength of the piston is higher. At the same time, an interference fit is adopted to create a certain friction resistance between the piston and the piston cavity, thereby preventing the piston from sliding down due to its own gravity and squeezing the valve stem, causing the device to open by mistake.

[0025] In one embodiment of the present application, the piston assembly further includes a gasket and a sealing ring, both of which are sleeved on the outside of the piston rod and arranged inside the connecting cavity, and the gasket is located on the side of the sealing ring away from the piston block.

[0026] In one embodiment of the present application, the upper cover assembly includes:

[0027] A handwheel, wherein a cavity is provided inside the handwheel, and a threaded rod is provided inside the cavity and is placed along the height direction of the upper cover assembly;

[0028] The upper cover body is threadedly connected to the valve body, a cavity is provided inside the upper cover body, a pressure regulating assembly is provided inside the cavity, the lower end of the threaded rod passes through the upper end of the upper cover body and is threadedly connected to the upper end of the upper cover body, the upper end of the pressure regulating assembly contacts the lower end of the threaded rod, and the lower end of the pressure regulating assembly contacts the upper end of the piston rod.

[0029] By adopting the above solution and providing a detachable upper cover body, when the pressure regulating assembly needs to be replaced, the entire pressure regulating assembly can be conveniently removed from the inside of the device by twisting the upper cover body, thereby improving the convenience of replacing the pressure regulating assembly of the device.

[0030] In one embodiment of the present application, the voltage regulating assembly includes:

[0031] A movable plate, the movable plate being slidably assembled in the cavity, the upper end of the movable plate being in contact with the lower end of the threaded rod;

[0032] an elastic member, the upper end of which is connected and fixed to the lower end of the movable plate;

[0033] A connecting button, wherein the upper end of the connecting button is connected and fixed to the lower end of the elastic member, and the lower end of the connecting button contacts the upper end of the piston rod.

[0034] In one embodiment of the present application, the elastic member is a columnar spring.

[0035] By adopting the above scheme, when the pressure reducing valve needs to be opened to divert and reduce the pressure of the gas inside the air inlet channel, the movable plate is pressed down and drives the elastic part to compress and deform. At this time, the connection drives the piston downward and drives the valve stem downward. The elastic force of the elastic part is used to prevent the valve stem from resetting. At the same time, the resistance between the piston itself and the piston cavity can also assist the elastic part to provide a certain downward force on the valve stem, so that it will not return to the original position, thereby ensuring the stability of the device during diversion and pressure reduction.

[0036] In one embodiment of the present application, the pressure reducing valve further includes an air inlet pipe and an air outlet pipe, the air inlet pipe is arranged on one side of the valve body and is connected to the air inlet channel, and the air outlet pipe is arranged on the other side of the valve body and is connected to the air outlet channel.

[0037] By adopting the above solution, the air inlet pipe and the air outlet pipe are utilized and are connected to the air inlet channel and the air outlet channel respectively, so that the device can be connected to the high-pressure gas pipeline.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] 1. By setting a piston and using the upper cover assembly to drive the piston down, it can drive the valve stem to move downward, so that the air intake channel is connected with the connecting cavity, so that part of the air flow in the air intake channel can be diverted to the air outlet channel, reducing the pressure in the air intake channel and achieving a decompression effect. At the same time, the structural strength of the piston itself is higher than that of the diaphragm, and its service life is longer.

[0040] 2. By setting the piston in the piston cavity with an interference fit, when the piston continues to press the valve stem, so that the valve stem continues to open and no longer blocks the connecting section, the friction resistance between the piston and the piston cavity can help provide a certain pressure on the valve stem, and cooperate with the elastic force of the elastic part, so that when the valve stem descends and opens the connecting section, the stability of the diversion and pressure reduction is guaranteed.

[0041] 3. By screwing the upper cover body onto the valve body, when the pressure regulating assembly needs to be replaced, the upper cover body can be easily removed from the valve body, thereby improving the convenience of replacing the pressure regulating assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a cross-sectional view of a pressure reducing valve provided in an embodiment of the present application;

[0043] Figure 2 It is a cross-sectional view of a pressure reducing gas valve stem provided in an embodiment of the present application.

[0044] Explanation of the accompanying drawings: 1. Valve body; 11. Valve stem assembly; 111. Valve stem; 112. Return spring; 12. Air inlet channel; 13. Air outlet channel; 14. Connecting chamber; 15. Piston assembly; 151. Piston rod; 152. Piston block; 153. Gasket; 154. Sealing ring; 16. Valve chamber; 161. Connecting section; 162. Moving section; 17. Piston chamber; 171. Connecting chamber; 172. Moving chamber; 2. Upper cover assembly; 21. Handwheel; 211. Cavity; 212. Threaded rod; 22. Upper cover body; 221. Cavity; 222. Pressure regulating assembly; 2221. Moving plate; 2222. Elastic member; 2223. Connecting button; 3. Air inlet pipe; 4. Air outlet pipe. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-2 The pressure reducing valve provided in this application is described in further detail.

[0046] See also Figure 1 , is a pressure reducing valve provided in an embodiment of the present application, comprising: a valve body 1 and an upper cover assembly 2, wherein an air inlet channel 12 and an air outlet channel 13 are respectively provided at both ends of the valve body 1, a connecting cavity 14 is provided inside the valve body 1 between the air inlet channel 12 and the air outlet channel 13, the connecting cavity 14 is connected to the air outlet channel 13, a liftable valve stem assembly 11 is provided between the air inlet channel 12 and the connecting cavity 14, the valve stem assembly 11 rises or falls to achieve blocking or communication between the air inlet channel 12 and the connecting cavity 14, a liftable piston assembly 15 is further provided inside the valve body 1, the piston assembly The lower end of 15 contacts the valve stem assembly 11, and is used to drive the valve stem assembly 11 to rise or fall. The upper cover assembly 2 is used to drive the piston assembly 15 to fall and squeeze the valve stem assembly 11 to fall. By setting the piston assembly 15 and using the upper cover assembly 2 to drive the piston assembly 15 to fall, the piston assembly 15 drives the valve stem 111 to fall, thereby making the air intake channel 12 and the connecting chamber 14 connected. By utilizing the high structural strength of the piston assembly 15 itself, it can normally drive the valve stem 111 to open the connecting chamber 14 while reducing the possibility of deformation, thereby avoiding the need for long-term replacement.

[0047] See also Figure 2The valve body 1 is provided with a valve chamber 16 extending along the height direction of the valve body 1 below the communicating chamber 14. The valve chamber 16 includes: a communicating section 161 and a moving section 162. The upper end of the communicating section 161 is communicated with the communicating chamber 14, the upper end of the moving section 162 is communicated with the communicating section 161, and the lower end of the moving section 162 is communicated with the air inlet passage 12. The diameter of the moving section 162 is larger than the diameter of the communicating section 161. By providing the communicating section 161 and the moving section 162 that are narrow at the top and wide at the bottom, the valve stem 111 can only be pressed downward, and the valve stem 111 and the communicating section 161 will not resist each other, thereby enabling the communicating chamber 14 to be opened. When the valve stem 111 is not manually intervened, the valve stem 111 can be pressed against the connecting section under the action of the return spring 112 and the air pressure of the air inlet passage 12, thereby achieving a better sealing effect of the valve stem 111.

[0048] See also Figure 1 and Figure 2 The valve stem assembly 11 includes: a valve stem 111 and a return spring 112, the valve stem 111 is arranged inside the communicating section 161, the upper end of the valve stem 111 passes through the communicating cavity 14 and contacts the piston assembly 15, the lower end of the valve stem 111 extends to the connection between the communicating section 161 and the moving section 162, and is used to block the connection between the communicating section 161 and the moving section 162, the return spring 112 is arranged inside the moving section 162 and is located below the valve stem 111, the upper end of the return spring 112 is connected and fixed to the lower end of the valve stem 111, and the lower end is connected and fixed to the bottom of the moving section 162. By arranging the valve stem 111 and the return spring 112, the valve stem 111 is provided with a fitting surface that matches the shape of the connection at the connection between the communicating section 161 and the moving section 162, so that when the valve stem 111 moves up and down, it can block the connection section or move away from the connection section to connect the intake channel 12 and the communicating cavity 14.

[0049] See also Figure 1 The valve body 1 is provided with a piston chamber 17 extending along the height direction of the valve body 1 above the communicating chamber 14. The piston assembly 15 is arranged inside the piston chamber 17. The piston chamber 17 includes: a connecting chamber 171 and a movable chamber 172. The upper end of the movable chamber 172 is communicated with the connecting chamber 171. The diameter of the movable chamber 172 is larger than the diameter of the connecting chamber 171. By setting a piston chamber 17 that is narrow at the top and wide at the bottom, when the piston moves upward inside the piston chamber 17, it can eventually abut against the piston chamber 17. The piston chamber 17 with an inverted T-shaped structure can limit the piston in one direction during use and will not fall out of the piston chamber 17, thereby improving the stability of the piston.

[0050] See also Figure 1The piston assembly 15 includes: a piston rod 151 and a piston block 152. The piston rod 151 is arranged inside the connecting chamber 171. The upper end of the piston rod 151 passes through the connecting chamber 171 and contacts the upper cover assembly 2. The piston block 152 is interference fit inside the movable chamber 172. The upper end of the piston block 152 is fixedly connected to the lower end of the piston rod 151. The lower end of the piston block 152 contacts the upper end of the valve stem 111. By providing the piston block 152 and the piston rod 151 that can move up and down, the valve stem 111 is pressed down by the piston block 152 during its descent, so that the valve chamber 16 can be quickly opened, so that the air intake channel 12 and the communicating chamber 14 are connected to each other.

[0051] See also Figure 1 The piston assembly 15 also includes a gasket 153 and a sealing ring 154, which are both sleeved on the outside of the piston rod 151 and arranged inside the connecting cavity 171. The gasket 153 is located on the side of the sealing ring 154 away from the piston block 152. By arranging the gasket 153 and the sealing ring 154, the piston rod 151 is more stable when moving inside the piston cavity 17, and the sealing performance of the piston is improved when moving in the piston cavity 17.

[0052] See also Figure 1 The upper cover assembly 2 includes: a handwheel 21 and an upper cover body 22, the handwheel 21 is provided with a cavity 211 inside, and a threaded rod 212 is provided inside the cavity 211 along the height direction of the upper cover assembly 2, the upper cover body 22 is threadedly connected to the valve body main body 1, the upper cover body 22 is provided with a cavity 221 inside, and a pressure regulating assembly 222 is provided inside the cavity 221, the lower end of the threaded rod 212 passes through the upper end of the upper cover body 22 and is threadedly connected to the upper end of the upper cover body 22, the upper end of the pressure regulating assembly 222 contacts the lower end of the threaded rod 212, and the lower end of the pressure regulating assembly 222 contacts the upper end of the piston rod 151. By providing the upper cover assembly 2 threadedly connected to the valve body main body 1, when the device needs to replace the pressure regulating assembly 222, the upper cover body 22 can be easily removed from the valve body main body 1 by rotating, thereby improving the convenience of replacing the pressure regulating assembly 222.

[0053] See also Figure 1The pressure regulating assembly 222 includes: a moving plate 2221, an elastic member 2222 and a connecting button 2223. The moving plate 2221 is slidably assembled inside the cavity 221. The upper end of the moving plate 2221 contacts the lower end of the threaded rod 212. The upper end of the elastic member 2222 is fixedly connected to the lower end of the moving plate 2221. The upper end of the connecting button 2223 is fixedly connected to the lower end of the elastic member 2222. The lower end of the connecting button 2223 is fixedly connected to the piston rod 15. 1, the elastic member 2222 is a columnar spring. By providing the elastic member 2222, when the device rotates the hand wheel 21 and drives the movable plate 2221 to move downward, the connecting button 2223 can press down the piston rod 151, and the piston rod 151 presses down the valve stem 111, thereby opening the air intake channel 12 and the communicating chamber 14. At this time, the elastic member 2222 elastically deforms itself, thereby continuously applying pressure to the valve stem 111, so that it will not be compressed back due to the air at the end of the air intake channel 12.

[0054] See also Figure 1 The pressure reducing valve also includes an air inlet pipe 3 and an air outlet pipe 4. The air inlet pipe 3 is arranged on one side of the valve body 1 and is connected to the air inlet channel 12. The air outlet pipe 4 is arranged on the other side of the valve body 1 and is connected to the air outlet channel 13.

[0055] To sum up, when the device needs to be opened to perform diversion and decompression, the handwheel 21 is first turned. The handwheel 21 drives the threaded rod 212 to rotate. The threaded rod 212 presses up and down on the upper cover body 22 and drives the movable plate 2221 to move downward. The movable plate 2221 presses down to drive the elastic member 2222 to deform and press the elastic button downward. The elastic button moves the piston rod 151 and the piston to press down. The piston presses against the valve stem 111 and drives the valve stem 111 to press down. The valve stem 111 moves downward and no longer blocks the connecting section, so that the device can easily open the valve chamber 16, so that the high-pressure airflow inside the air inlet channel 12 passes through the valve chamber 16 and the connecting chamber 14 in turn to reach the air outlet channel 13, so as to realize the function of diverting and reducing the pressure of the high-pressure airflow inside the air inlet channel 12.

[0056] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A pressure reducing valve, characterized in that: include: A valve body (1), wherein an air inlet channel (12) and an air outlet channel (13) are respectively provided at both ends of the valve body (1); a communication chamber (14) is provided inside the valve body (1) between the air inlet channel (12) and the air outlet channel (13); the communication chamber (14) is communicated with the air outlet channel (13); a liftable valve stem assembly (11) is provided between the air inlet channel (12) and the communication chamber (14); the valve stem assembly (11) rises or falls to achieve blocking or communication between the air inlet channel (12) and the communication chamber (14); a liftable piston assembly (15) is further provided inside the valve body (1); the lower end of the piston assembly (15) contacts the valve stem assembly (11) and is used to drive the valve stem assembly (11) to rise or fall; The upper cover assembly (2) is used to drive the piston assembly (15) to descend and squeeze the valve stem assembly (11) to descend.

2. A pressure reducing valve according to claim 1, characterized in that: The valve body (1) is provided with a valve cavity (16) below the communicating cavity (14) and extending along the height direction of the valve body (1). The valve cavity (16) includes: A communication section (161), wherein the upper end of the communication section (161) is in communication with the communication cavity (14); A moving section (162), the upper end of the moving section (162) is connected to the connecting section (161), the lower end of the moving section (162) is connected to the air inlet passage (12), and the diameter of the moving section (162) is larger than the diameter of the connecting section (161).

3. A pressure reducing valve according to claim 2, characterized in that: The valve stem assembly (11) comprises: a valve stem (111), the valve stem (111) being arranged inside the communication section (161), the upper end of the valve stem (111) passing through the communication cavity (14) and contacting the piston assembly (15), and the lower end of the valve stem (111) extending to the connection between the communication section (161) and the moving section (162), for blocking the connection between the communication section (161) and the moving section (162); A return spring (112), the return spring (112) is arranged inside the moving section (162) and is located below the valve stem (111), the upper end of the return spring (112) is connected and fixed to the lower end of the valve stem (111), and the lower end is connected and fixed to the bottom of the moving section (162).

4. A pressure reducing valve according to claim 3, characterized in that: The valve body (1) is provided with a piston cavity (17) extending in the height direction of the valve body (1) above the communication cavity (14). The piston assembly (15) is arranged inside the piston cavity (17). The piston cavity (17) includes: connecting cavity (171); A movable cavity (172), the upper end of which is communicated with the connecting cavity (171), and the diameter of the movable cavity (172) is larger than the diameter of the connecting cavity (171).

5. A pressure reducing valve according to claim 4, characterized in that: The piston assembly (15) comprises: A piston rod (151), wherein the piston rod (151) is disposed inside the connecting cavity (171), and the upper end of the piston rod (151) passes through the connecting cavity (171) and contacts the upper cover assembly (2); A piston block (152) is interference-fittedly disposed inside the movable chamber (172), the upper end of the piston block (152) is connected and fixed to the lower end of the piston rod (151), and the lower end of the piston block (152) contacts the upper end of the valve stem (111).

6. The pressure reducing valve according to claim 5, characterized in that: The piston assembly (15) further includes a gasket (153) and a sealing ring (154). Both the gasket (153) and the sealing ring (154) are sleeved on the outside of the piston rod (151) and arranged inside the connecting cavity (171). The gasket (153) is located on a side of the sealing ring (154) away from the piston block (152).

7. The pressure reducing valve according to claim 5, characterized in that: The upper cover assembly (2) comprises: A hand wheel (21), wherein a cavity (211) is provided inside the hand wheel (21), and a threaded rod (212) is provided inside the cavity (211) and is placed along the height direction of the upper cover assembly (2); An upper cover body (22), the upper cover body (22) is threadedly connected to the valve body (1), a cavity (221) is provided inside the upper cover body (22), a pressure regulating assembly (222) is provided inside the cavity (221), the lower end of the threaded rod (212) passes through the upper end of the upper cover body (22) and is threadedly connected to the upper end of the upper cover body (22), the upper end of the pressure regulating assembly (222) contacts the lower end of the threaded rod (212), and the lower end of the pressure regulating assembly (222) contacts the upper end of the piston rod (151).

8. The pressure reducing valve according to claim 7, characterized in that: The pressure regulating assembly (222) includes: A movable plate (2221), wherein the movable plate (2221) is slidably assembled inside the cavity (221), and the upper end of the movable plate (2221) contacts the lower end of the threaded rod (212); an elastic member (2222), the upper end of the elastic member (2222) being connected and fixed to the lower end of the movable plate (2221); A connecting button (2223), the upper end of the connecting button (2223) is connected and fixed to the lower end of the elastic member (2222), and the lower end of the connecting button (2223) is in contact with the upper end of the piston rod (151).

9. The pressure reducing valve according to claim 8, characterized in that: The elastic member (2222) is a columnar spring.

10. The pressure reducing valve according to claim 1, characterized in that: The pressure reducing valve further comprises an air inlet pipe (3) and an air outlet pipe (4), wherein the air inlet pipe (3) is arranged on one side of the valve body (1) and communicates with the air inlet passage (12), and the air outlet pipe (4) is arranged on the other side of the valve body (1) and communicates with the air outlet passage (13).

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