Pressure reducing valve with overflowing cut-off device

Abstract

The utility model discloses a pressure reducing valve with an overflowing cut-off device, which belongs to the technical field of pressure reducing valves and comprises a valve body, an air inlet is arranged at one end of the valve body, an air outlet is arranged at the other end of the valve body, the air inlet is communicated with a cut-off cavity, a cut-off steel ball is arranged in the cut-off cavity, and the overflowing cut-off device is arranged on the side wall of the valve body. A transition cavity is formed in the end, away from the air inlet, of the cut-off cavity, a leakage stopping rubber mat is fixedly arranged at the end, facing the cut-off cavity, of the transition cavity, a plurality of leakage stopping rubber rings are arranged on the side wall of the transition cavity, a forked hole is communicated between the visible pressure steel meter and the flow guide channel, and a piston is arranged in the through hole. And a movement mechanism for driving the piston is arranged in the cavity. The visual pressure steel meter communicated with the overflowing cut-off device is arranged on the pressure reducing valve, so that when the overflowing cut-off device cuts off airflow, the visual pressure steel meter can visually display the pressure in the cavity, and a worker can conveniently know the pressure.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure reducing valves, and in particular relates to a pressure reducing valve with an over-current cutting device. Background Art

[0002] The pressure reducing valve is a throttling element with variable local resistance, usually called PRV. It changes the throttling area, changes the flow velocity and kinetic energy of the fluid, causes different pressure losses, and thus achieves the purpose of pressure reduction. At the same time, it can make the system flow distribution reasonable and improve the overall layout and working conditions of the system.

[0003] An over-flow cut-off device is usually provided in a pressure reducing valve. However, whether it is an automatic or manual cut-off device, when excessive airflow enters and the cut-off device cuts off the airflow, it is difficult to clearly indicate the specific pressure of the airflow applied to the pressure reducing valve. Therefore, it is difficult for staff to accurately know how much airflow will cause the over-flow cut-off device to cut off the airflow in the actual work process.

[0004] Therefore, we propose a pressure reducing valve with an over-current cut-off device to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the problems in the prior art and proposes a pressure reducing valve with an over-current cutting device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A pressure reducing valve with an over-current cut-off device comprises a valve body, one end of the valve body is provided with an air inlet, and the other end is provided with an air outlet, the air inlet is connected with a cut-off cavity, a cut-off steel ball is installed in the cut-off cavity, the side wall of the valve body is provided with an over-current cut-off device, the cut-off cavity is provided with a transition cavity at an end away from the air inlet, a leak-proof rubber pad is fixedly installed on the transition cavity facing the end of the cut-off cavity, a plurality of leak-proof rubber rings are installed on the side wall of the transition cavity, the top of the transition cavity is connected with a guide channel, a cavity is opened in the valve body, the other end of the guide channel is connected with the cavity, the end of the cavity away from the guide channel is connected with the air outlet, a visual pressure steel gauge is installed on the side wall of the valve body, a bifurcation hole is connected between the visual pressure steel gauge and the guide channel, a through hole is opened at one end of the transition cavity away from the leak-proof rubber pad, a piston is arranged in the through hole, and a motion mechanism for driving the piston is arranged in the cavity.

[0008] Preferably, the overcurrent cut-off device comprises a fixed cylinder, a cut-off handle, a rubber plug and a buckle cover, the fixed cylinder is mounted on the side wall of the valve body, the fixed cylinder is communicated with the cut-off cavity, the cut-off handle is mounted in the fixed cylinder, the rubber plug is mounted at the bottom of the cut-off handle extending into the cut-off cavity, the buckle cover is fixedly mounted on the top of the cut-off handle, and the buckle cover is buckled above the fixed cylinder.

[0009] Preferably, the leak-proof rubber ring is a double-layer design, and the material of the leak-proof rubber ring is nitrile.

[0010] Preferably, a telescopic spring is fixedly mounted on the bottom wall of the buckle cover, the other end of the telescopic spring is fixedly connected to the side wall of the fixed cylinder, and the telescopic spring is sleeved outside the fixed cylinder.

[0011] Preferably, the movement mechanism includes a pressure spring, a flat diaphragm, a diaphragm connecting rod, an adjusting rod, a center rod and a pushing rod, one end of the pressure spring is fixedly mounted on the bottom wall of the cavity, and the other end is fixedly connected to the bottom wall of the flat diaphragm, the diaphragm connecting rod is fixedly mounted on the top of the flat diaphragm, the adjusting rod is located above the diaphragm connecting rod, the center rod is fixedly mounted on the side wall of the cavity, the center rod passes through the side wall of the adjusting rod and is rotatably connected to the adjusting rod, the adjusting rod is rotatably connected to one end of the pushing rod, and the other end of the pushing rod is fixedly connected to the side wall of the piston.

[0012] Preferably, the leak-proof rubber gasket is a gasket with a hole in the middle, and the diameter of the cut-off steel ball is larger than the inner diameter of the hole in the middle of the leak-proof rubber gasket.

[0013] In summary, the technical effects and advantages of the utility model are as follows:

[0014] When the air pressure in the cavity of the pressure reducing valve is too high, the over-current cut-off device can be used to press down the cut-off steel ball to cut off the airflow. The remaining airflow enters the visual pressure steel gauge through the bifurcation hole. The staff can know the pressure inside the cavity through the pressure steel gauge, and the over-current cut-off device can also balance the pressure in the cavity, so that the pressure reducing valve can work stably at a suitable pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 for Figure 1 A partial enlarged view of part A;

[0017] Figure 3 for Figure 1 A partial enlarged view of part B.

[0018] In the figure: 1. valve body; 2. air inlet; 3. air outlet; 4. cut-off chamber; 5. cut-off steel ball; 6. transition chamber; 7. leak-proof rubber pad; 8. leak-proof rubber ring; 9. diversion channel; 10. chamber; 11. visual pressure steel gauge; 12. bifurcation hole; 13. through hole; 14. piston; 15. fixing cylinder; 16. cut-off handle; 17. rubber plug; 18. buckle cover; 19. telescopic spring; 20. pressure spring; 21. flat diaphragm; 22. diaphragm connecting rod; 23. adjusting rod; 24. center rod; 25. push rod. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] like Figure 1-Figure 3 As shown, a pressure reducing valve with an overcurrent cut-off device comprises a valve body 1, an air inlet 2 is arranged at one end of the valve body 1, and an air outlet 3 is arranged at the other end, the air inlet 2 is connected with a cut-off cavity 4, a cut-off steel ball 5 is arranged in the cut-off cavity 4, an overcurrent cut-off device is arranged on the side wall of the valve body 1, and the overcurrent cut-off device comprises a fixed cylinder 15, a cut-off handle 16, a rubber plug 17 and a buckle cover 18, the fixed cylinder 15 is arranged on the side wall of the valve body 1, the fixed cylinder 15 is communicated with the cut-off cavity 4, and the cut-off handle 16 is arranged on the side wall of the valve body 1. It is arranged in the fixed cylinder 15, the rubber plug 17 is installed at the bottom where the cutting handle 16 extends into the cutting cavity 4, the buckle cover 18 is fixedly installed on the top of the cutting handle 16, the buckle cover 18 is buckled on the top of the fixed cylinder 15, and a telescopic spring 19 is fixedly installed on the bottom wall of the buckle cover 18. The force applied to the buckle cover 18 by the telescopic spring 19 will make the buckle cover 18 always in a lifted state, and the other end of the telescopic spring 19 is fixedly connected to the side wall of the fixed cylinder 15, and the telescopic spring 19 is sleeved on the outside of the fixed cylinder 15.

[0021] A transition chamber 6 is arranged at one end of the cutting chamber 4 away from the air inlet 2, and a leak-proof rubber pad 7 is fixedly arranged at one end of the transition chamber 6 facing the cutting chamber 4. The leak-proof rubber pad 7 is a gasket with a hole in the middle. The diameter of the cutting steel ball 5 is larger than the inner diameter of the hole in the middle of the leak-proof rubber pad 7. When the cutting steel ball 5 is pushed by the airflow, the hole in the middle of the leak-proof rubber pad 7 will be blocked. A plurality of leak-proof rubber rings 8 are arranged on the side wall of the transition chamber 6. The leak-proof rubber rings 8 are double-layered and made of nitrile. The leak-proof rubber rings 8 can be made of nitrile material imported from Japan to ensure airtightness.

[0022] A guide channel 9 is connected to the top of the transition chamber 6, a cavity 10 is opened in the valve body 1, the other end of the guide channel 9 is connected to the cavity 10, and the end of the cavity 10 away from the guide channel 9 is connected to the air outlet 3. A visual pressure steel gauge 11 is installed on the side wall of the valve body 1, and a bifurcation hole 12 is connected between the visible pressure steel gauge 11 and the guide channel 9. A through hole 13 is opened at the end of the transition chamber 6 away from the leak-proof rubber pad 7, and a piston 14 is arranged in the through hole 13. The size of the piston 14 is consistent with the internal size of the through hole 13, so the piston 14 can completely seal the through hole 13 to ensure that the airflow does not enter the cavity 10 from the through hole 13. A moving mechanism for driving the piston 14 is installed in the cavity 10, and the moving mechanism includes a pressure spring 20, a flat diaphragm 21, a diaphragm connecting rod 22, an adjusting rod 23, a center rod 24 and a push rod 25. One end of the pressure spring 20 is fixedly installed on the bottom wall of the cavity 10, and the other end is fixedly connected to the bottom wall of the flat diaphragm 21. The diaphragm connecting rod 22 is fixedly installed on the top of the flat diaphragm 21. The adjusting rod 23 is located above the diaphragm connecting rod 22. The center rod 24 is fixedly installed on the side wall of the cavity 10. The center rod 24 passes through the side wall of the adjusting rod 23 and is rotatably connected to the adjusting rod 23. The adjusting rod 23 is rotatably connected to one end of the push rod 25, and the other end of the push rod 25 is fixedly connected to the side wall of the piston 14.

[0023] The working principle is as follows: after the air is taken in, the airflow will push the cutting steel ball 5 up to the middle position of the leak-proof rubber pad 7. At this time, the gas cannot enter the cavity 10. When the buckle cover 18 is pressed down, the buckle cover 18 drives the cutting handle 16 and the rubber plug 17 to press down, and the cutting steel ball 5 is pressed down. The gas enters the cavity 10 through the transition cavity 6. The air pressure in the cavity 10 increases, which pushes the flat diaphragm 21 up and pulls up the diaphragm connecting rod 22. The diaphragm connecting rod 22 drives the adjusting rod 23, and the adjusting rod 23 rotates around the center rod 24, so that the push rod 25 drives the piston 14 to rotate. The piston 14 moves in the through hole 13, so that the high-pressure gas is adjusted to become usable low-pressure gas. When the air pressure is low, the pressure spring 20 drives the flat diaphragm 21 downward when it is pressed down, and the diaphragm connecting rod 22 presses down the adjusting rod 23, driving the piston 14 to move again, so that the high-pressure gas enters the cavity 10, and the product works continuously. When the air flow exceeds the set flow rate, the gas pulls the cutting steel ball 5 to seal on the leak-proof rubber pad 7 to cut off the air flow, and the gas enters the visual pressure steel gauge 11 through the bifurcation hole 12, which can display the pressure in the cavity 10.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pressure reducing valve with an overcurrent cut-off device, comprising a valve body (1), characterized in that: The valve body (1) is provided with an air inlet (2) at one end and an air outlet (3) at the other end. The air inlet (2) is connected to a cut-off chamber (4). A cut-off steel ball (5) is installed in the cut-off chamber (4). A flow cut-off device is installed on the side wall of the valve body (1). A transition chamber (6) is installed at the end of the cut-off chamber (4) away from the air inlet (2). A leak-proof rubber pad (7) is fixedly installed at the end of the transition chamber (6) facing the cut-off chamber (4). A plurality of leak-proof rubber rings (8) are installed on the side wall of the transition chamber (6). A flow guide channel (9) is connected to the top of the transition chamber (6). The valve body A cavity (10) is provided in the valve body (1), the other end of the flow guide channel (9) is in communication with the cavity (10), the end of the cavity (10) away from the flow guide channel (9) is in communication with the air outlet (3), a visual pressure steel gauge (11) is installed on the side wall of the valve body (1), a bifurcation hole (12) is connected between the visual pressure steel gauge (11) and the flow guide channel (9), a through hole (13) is provided at the end of the transition chamber (6) away from the leak-proof rubber pad (7), a piston (14) is arranged in the through hole (13), and a movement mechanism for driving the piston (14) is installed in the cavity (10).

2. A pressure reducing valve with an overcurrent cut-off device according to claim 1, characterized in that: The overcurrent cut-off device comprises a fixed cylinder (15), a cut-off handle (16), a rubber plug (17) and a buckle cover (18); the fixed cylinder (15) is mounted on the side wall of the valve body (1); the interior of the fixed cylinder (15) is in communication with the cut-off chamber (4); the cut-off handle (16) is mounted in the fixed cylinder (15); the rubber plug (17) is mounted at the bottom of the cut-off handle (16) extending into the cut-off chamber (4); the buckle cover (18) is fixedly mounted on the top of the cut-off handle (16); and the buckle cover (18) is buckled above the fixed cylinder (15).

3. A pressure reducing valve with an overcurrent cut-off device according to claim 1, characterized in that: The leak-proof rubber ring (8) is of double-layer design, and the material of the leak-proof rubber ring (8) is nitrile.

4. A pressure reducing valve with an overcurrent cut-off device according to claim 2, characterized in that: A telescopic spring (19) is fixedly mounted on the bottom wall of the buckle cover (18), the other end of the telescopic spring (19) is fixedly connected to the side wall of the fixed cylinder (15), and the telescopic spring (19) is sleeved outside the fixed cylinder (15).

5. The pressure reducing valve with an overcurrent cut-off device according to claim 1, characterized in that: The motion mechanism comprises a pressure spring (20), a flat diaphragm (21), a diaphragm connecting rod (22), an adjusting rod (23), a center rod (24) and a push rod (25); one end of the pressure spring (20) is fixedly mounted on the bottom wall of the cavity (10), and the other end is fixedly connected to the bottom wall of the flat diaphragm (21); the diaphragm connecting rod (22) is fixedly mounted on the top of the flat diaphragm (21); the adjusting rod (23) is located above the diaphragm connecting rod (22); the center rod (24) is fixedly mounted on the side wall of the cavity (10); the center rod (24) passes through the side wall of the adjusting rod (23) and is rotatably connected to the adjusting rod (23); the adjusting rod (23) is rotatably connected to one end of the push rod (25); and the other end of the push rod (25) is fixedly connected to the side wall of the piston (14).

6. The pressure reducing valve with an overcurrent cut-off device according to claim 1, characterized in that: The leak-proof rubber pad (7) is a gasket with a hole in the middle, and the diameter of the cut-off steel ball (5) is larger than the inner diameter of the hole in the middle of the leak-proof rubber pad (7).

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