Pressure reducing valve capable of conveniently adjusting pressure

Abstract

The utility model belongs to the field of pressure reducing valves, and relates to a pressure reducing valve convenient to adjust pressure, which comprises a valve body, a longitudinal adjusting channel is formed in the middle of the valve body, a pressure adjusting port is formed at the lower end of a working channel, an adjusting seat is fixed at the upper end of the adjusting channel, an adjusting screw rod is arranged in the adjusting seat, and a spring seat is arranged at the lower end of the adjusting screw rod. An adjusting spring is arranged at the lower end of the spring seat, an elastic corrugated pipe is arranged at the lower end of the adjusting spring, the adjusting spring abuts between the spring seat and the elastic corrugated pipe, and a sealing ring is arranged at the lower end of the elastic corrugated pipe so that the elastic corrugated pipe and the adjusting channel can be connected in a sealed mode. A pressure regulating valve element is arranged at the lower end of the pressure regulating opening, a compression spring is arranged at the lower end of the pressure regulating valve element to abut against the pressure regulating opening, the upper end of the regulating rod abuts against the inner wall of the upper end of the elastic corrugated pipe, and the lower end of the regulating rod abuts against the upper end of the pressure regulating valve element. The device has the advantage that the pressure in the working channel can be conveniently adjusted.

Description

Technical Field

[0001] The invention belongs to the field of pressure reducing valves, and relates to a pressure reducing valve which is convenient for adjusting the pressure. Background Art

[0002] The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure through regulation, and relies on the energy of the medium itself to automatically keep the outlet pressure stable. Then, the fluctuation of the pressure after the valve is balanced with the spring force by the regulation of the control and regulation system, so that the pressure after the valve is kept constant within a certain error range. According to different needs, we need different pressures in the working channel, so we need to adjust the pressure in the working channel. In the existing technology, the adjustment methods are relatively complicated. Summary of the invention

[0003] In view of the above problems, the present invention provides a pressure reducing valve which is convenient for adjusting the pressure. The device has the advantage of being able to conveniently adjust the pressure in a working channel.

[0004] The object of the present invention is achieved in that:

[0005] A pressure reducing valve for conveniently adjusting the pressure comprises a valve body, a working channel connecting an inlet and an outlet is arranged on the valve body, a longitudinal adjusting channel is formed in the middle of the valve body, the adjusting channel is connected with the working channel, a pressure regulating port is arranged in the working channel, the pressure regulating port is connected with the working channel and is arranged corresponding to the adjusting channel, an adjusting seat is fixed to the upper end of the adjusting channel, an adjusting screw is arranged in the adjusting seat, the adjusting screw extends upward to the outside of the adjusting seat, a spring seat is arranged at the lower end of the adjusting screw, an adjusting spring is arranged at the lower end of the spring seat, an elastic bellows is arranged at the lower end of the adjusting spring, the adjusting spring is abutted between the spring seat and the elastic bellows, the upper end of the elastic bellows is closed, the lower end of the elastic bellows is open, a sealing ring is arranged at the lower end of the elastic bellows so that the elastic bellows and the adjusting channel are sealed and connected;

[0006] An adjusting rod is provided in the elastic bellows, a guide is provided in the adjusting channel, the adjusting rod passes through the guide and extends to the pressure regulating port below, a pressure regulating valve core is provided at the lower end of the pressure regulating port, and the pressure regulating valve core is pressed against the pressure regulating port through a compression spring provided at the lower end, the upper end of the adjusting rod presses against the upper inner wall of the elastic bellows, and the lower end of the adjusting rod presses against the upper end of the pressure regulating valve core.

[0007] When the inlet pressure is greater than the threshold, the gap between the pressure regulating valve core and the pressure regulating port becomes larger, thereby reducing the pressure after the pressure regulating port goes out; when the inlet pressure is less than the threshold, the gap between the pressure regulating valve core and the pressure regulating port becomes smaller, thereby increasing the pressure after the pressure regulating port goes out, so that the outlet can maintain a stable pressure. When the outlet pressure needs to be adjusted, the adjusting screw is turned, and the screw and the adjusting seat move up and down, which causes the spring seat to move up and down, thereby changing the elastic force of the adjusting spring on the elastic bellows, thereby changing the pressure of the elastic bellows on the adjusting rod, and indirectly changing the pressure of the adjusting rod on the pressure regulating valve core. Since the acting directions of the adjusting rod and the compression spring are opposite, the adjusting rod can offset part of the force of the compression spring on the pressure regulating valve core against the pressure regulating port, so the greater the pressure of the adjusting rod on the pressure regulating valve core, the smaller the force of the pressure regulating valve core blocking the pressure regulating port, and the smaller the outlet pressure; the smaller the pressure of the adjusting rod on the pressure regulating valve core, the greater the force of the pressure regulating valve core blocking the pressure regulating port, and the greater the outlet pressure, thereby achieving the size of the pressure in the regulating working channel.

[0008] The utility model is further configured as follows: the pressure regulating valve core comprises a conical body, the conical body is small at the top and large at the bottom, and the upper end of the conical body extends into the pressure regulating port to play a sealing role.

[0009] In the prior art, the pressure regulating valve core is disc-shaped, and a sealing ring is connected to the upper plane thereof by glue, and the pressure regulating port is blocked by the sealing ring. With this flat sealing method, when the pressure is discharged, the pressure change at the outlet is jumping, the change value is unstable, and high temperature can easily cause the rubber ring to fall off. However, when a conical main body is adopted and the upper end part extends into the pressure regulating port, the pressure at the outlet is relatively stable when the pressure is discharged.

[0010] The utility model is further configured as follows: the pressure regulating valve core also includes a limit shaft formed below the conical body, the compression spring is sleeved outside the limit shaft, the upper end of the compression spring abuts against the lower end of the conical body, and the lower end of the compression spring abuts against the base of the valve body.

[0011] Through the action of the limiting shaft, the compression spring is made more stable.

[0012] The utility model is further configured as follows: the conical body is made of polytetrafluoroethylene.

[0013] By using this material, a good sealing effect can be achieved without using a sealing ring, and the performance is stable and it is not easy to soften at high temperatures.

[0014] The utility model is further configured as follows: a limiting hole for inserting the lower end of the regulating rod is formed on the upper end of the pressure regulating valve core, and the limiting hole matches the lower end of the regulating rod.

[0015] By setting the limiting hole, the cooperation between the regulating rod and the limiting hole is more stable. Since the guide member guides the regulating rod, it indirectly stabilizes the movement of the pressure regulating valve core.

[0016] The utility model is further configured as follows: the guide member includes a cylindrical body, a guide hole is provided in the middle of the cylindrical body, a convex edge extends circumferentially from the middle of the cylindrical body, a step matching the convex edge is formed in the adjustment channel, and a retaining spring is provided to fix the convex edge, and the adjustment rod passes through the guide hole.

[0017] Through the above arrangement, the guide member can be stably arranged in the adjustment channel and can guide the adjustment rod, making the adjustment more stable.

[0018] The utility model is further configured as follows: the upper end surface of the elastic bellows is recessed downward to form a limiting groove, and the lower end of the regulating spring is arranged in the limiting groove.

[0019] Through the above settings, the adjustment spring is made more stable.

[0020] The utility model is further configured as follows: a limiting column is formed at the lower end of the spring seat, and the upper end of the regulating spring is sleeved outside the limiting column.

[0021] By setting the limit column, the adjustment spring is more stable.

[0022] The utility model is further configured as follows: a screw hole matching the adjusting screw is formed on the upper end of the adjusting seat, a fixing nut is sleeved on the adjusting screw, and the fixing nut is arranged above the screw hole.

[0023] The utility model is further configured as follows: a hand-held portion is fixed on the upper end of the adjusting screw.

[0024] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects: the pressure in the working channel can be adjusted by rotating the adjusting screw. Moreover, by setting the bellows, when the pressure is adjusted by adjusting the position of the adjusting rod, the sealing of the adjusting channel can be always maintained without affecting the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is one of the structural diagrams of the pressure reducing valve.

[0027] Figure 2 This is the second structural diagram of the pressure reducing valve.

[0028] Figure 3It is a structural diagram of the valve body.

[0029] Figure 4 It is a structural diagram of the pressure regulating valve core.

[0030] Figure 5 Schematic diagram of the structure of the guide.

[0031] Figure 6 Schematic diagram of the structure of the elastic bellows.

[0032] 1-valve body; 2-working channel; 3-inlet; 4-outlet; 5-pressure regulating port; 6-pressure gauge interface; 7-pressure detection channel; 8-adjusting channel; 9-adjusting seat; 10-adjusting screw; 11-handle; 12-spring seat; 13-adjusting spring; 14-elastic bellows; 15-adjusting rod; 16-guide; 18-pressure regulating valve core; 19-compression spring; 20-conical body; 21-limiting shaft; 22-limiting hole; 23-columnar body; 24-guide hole; 25-convex edge; 26-circlip; 27-limiting groove; 28-limiting column; 29-fixing nut. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0034] A pressure reducing valve for conveniently adjusting the pressure comprises a valve body 1, a working channel 2 is provided on the valve body 1 to connect an inlet 3 and an outlet 4, a longitudinal adjusting channel 8 is formed in the middle of the valve body 1, the adjusting channel 8 is connected with the working channel 2, a pressure regulating port 5 is provided in the working channel 2, the pressure regulating port 5 is connected with the working channel 2 and is arranged corresponding to the adjusting channel 8, an adjusting seat 9 is also fixed to the upper end of the adjusting channel 8, an adjusting screw 10 is provided in the adjusting seat 9, the adjusting screw 10 extends upward to the outside of the adjusting seat 9 and is fixed with a hand-held part 11, a spring seat 12 is provided at the lower end of the adjusting screw 10, an adjusting spring 13 is provided at the lower end of the spring seat 12, an elastic bellows 14 is provided at the lower end of the adjusting spring 13, the adjusting spring 13 is abutted between the spring seat 12 and the elastic bellows 14, the upper end of the elastic bellows 14 is closed, and the lower end of the elastic bellows 14 is open, and a sealing ring 15 is provided at the lower end of the elastic bellows 14 so that the elastic bellows 14 and the adjusting channel 8 are sealed and connected;

[0035] An adjusting rod 15 is provided in the elastic bellows 14, and a guide member 16 is provided in the adjusting channel 8. The adjusting rod 15 passes through the guide member 16 and extends to the pressure regulating port 5 below. A pressure regulating valve core 18 is provided at the lower end of the pressure regulating port 5. The pressure regulating valve core 18 is pressed against the pressure regulating port 5 by a compression spring 19 provided at the lower end. The upper end of the adjusting rod 15 presses against the inner wall of the upper end of the elastic bellows 14, and the lower end of the adjusting rod 15 presses against the upper end of the pressure regulating valve core 18.

[0036] When the inlet pressure 3 is greater than the threshold value, the gap between the pressure regulating valve core 18 and the pressure regulating port 5 becomes larger, thereby reducing the pressure after going out from the pressure regulating port; when the inlet pressure is less than the threshold value, the gap between the pressure regulating valve core 18 and the pressure regulating port 5 becomes smaller, thereby increasing the pressure after going out from the pressure regulating port, so that the outlet 4 can maintain a stable pressure. When the outlet pressure needs to be adjusted, the adjusting screw 10 is rotated, and the adjusting screw 10 and the adjusting seat 9 move up and down, thereby causing the spring seat 12 to move up and down, thereby changing the elastic force of the adjusting spring 13 on the elastic bellows 14, thereby changing the pressure of the elastic bellows 14 on the adjusting rod 15, and indirectly changing the pressure of the adjusting rod 15 on the pressure regulating valve core 18. Since the acting directions of the adjusting rod 15 and the compression spring 19 are opposite, the adjusting rod 15 can offset part of the force of the compression spring 19 on the pressure regulating valve core 18 against the pressure regulating port 5. Therefore, the greater the pressure of the adjusting rod 15 on the pressure regulating valve core 18, the smaller the force of the pressure regulating valve core 18 blocking the pressure regulating port 5, and the smaller the outlet pressure; the smaller the pressure of the adjusting rod 15 on the pressure regulating valve core 18, the greater the force of the pressure regulating valve core 18 blocking the pressure regulating port 5, and the greater the outlet pressure, thereby achieving the purpose of adjusting the pressure in the working channel.

[0037] The pressure regulating valve core 18 includes a conical body 20, which is small at the top and large at the bottom. The upper end of the conical body extends into the pressure regulating port to seal. In the prior art, the pressure regulating valve core is disc-shaped, and a sealing ring is connected to the upper plane thereof by glue, and the pressure regulating port is blocked by the sealing ring. In this plane sealing method, when the pressure is discharged, the pressure change at the outlet is jumping, the change value is unstable, and the high temperature easily causes the rubber ring to fall off; while the setting of the conical body is adopted, and the upper end is extended into the pressure regulating port, when the pressure is discharged, the pressure at the outlet is relatively stable.

[0038] The pressure regulating valve core 18 also includes a limit shaft 21 formed below the conical body 20, and the compression spring 19 is sleeved outside the limit shaft, the upper end of the compression spring 19 abuts against the lower end of the conical body, and the lower end of the compression spring abuts against the base of the valve body. The limit shaft 21 makes the compression spring 19 more stable.

[0039] The conical body 20 is made of polytetrafluoroethylene. By using this material, a good sealing effect can be achieved without using a sealing ring, and the performance is stable and it is not easy to soften at high temperature.

[0040] The upper end of the pressure regulating valve core 18 is formed with a limiting hole 22 for inserting the lower end of the regulating rod 15, and the limiting hole 22 matches the lower end of the regulating rod 15. The setting of the limiting hole 22 makes the cooperation between the regulating rod 15 and the limiting hole 22 more stable, and because the guide member 16 guides the regulating rod 15, it indirectly stabilizes the movement of the pressure regulating valve core 18.

[0041] The guide member 16 includes a columnar body 23, a guide hole 24 is provided in the middle of the columnar body 23, a convex edge 25 is extended circumferentially from the middle of the columnar body 23, a step matching the convex edge 25 is formed in the adjustment channel 8, and a retaining spring 26 is provided to fix the convex edge, and the adjustment rod 15 passes through the guide hole 24. Through the above arrangement, the guide member 16 can be stably arranged in the adjustment channel 8, and can guide the adjustment rod 15, so that the adjustment is more stable.

[0042] The upper end surface of the elastic bellows 14 is recessed downward to form a limiting groove 27, and the lower end of the adjustment spring 13 is arranged in the limiting groove 27. Through the above arrangement, the adjustment spring is more stable.

[0043] The lower end of the spring seat 12 is formed with a limiting column 28, and the upper end of the regulating spring 13 is sleeved outside the limiting column 28. The setting of the limiting column makes the regulating spring more stable.

[0044] The upper end of the adjusting seat 9 is formed with a screw hole matching the adjusting screw rod. The adjusting screw rod 10 is sleeved with a fixing nut 29, which is arranged above the screw hole.

[0045] The valve body is also provided with a pressure gauge interface 6 for connecting a pressure gauge to detect the outlet pressure. The pressure detection channel 7 is connected to the working channel 2. The pressure detection channel 7 is connected within the section from the pressure regulating port to the outlet.

[0046] The present invention has the characteristic of being able to conveniently adjust the pressure in the working channel.

[0047] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure reducing valve for conveniently adjusting pressure, comprising a valve body, a working channel connecting an inlet and an outlet is provided on the valve body, and the valve body is characterized in that: A longitudinal adjustment channel is formed in the middle of the valve body, the adjustment channel is connected with the working channel, a pressure regulating port is arranged in the working channel, the pressure regulating port is connected with the working channel and is arranged corresponding to the adjustment channel, an adjustment seat is also fixed to the upper end of the adjustment channel, an adjustment screw is arranged in the adjustment seat, the adjustment screw extends upward to the outside of the adjustment seat, a spring seat is arranged at the lower end of the adjustment screw, an adjustment spring is arranged at the lower end of the spring seat, an elastic bellows is arranged at the lower end of the adjustment spring, the adjustment spring is abutted between the spring seat and the elastic bellows, the upper end of the elastic bellows is closed, the lower end of the elastic bellows is open, and a sealing ring is arranged at the lower end of the elastic bellows so that the elastic bellows and the adjustment channel are sealed and connected; An adjusting rod is provided in the elastic bellows, a guide is provided in the adjusting channel, the adjusting rod passes through the guide and extends to the pressure regulating port below, a pressure regulating valve core is provided at the lower end of the pressure regulating port, and the pressure regulating valve core is pressed against the pressure regulating port through a compression spring provided at the lower end, the upper end of the adjusting rod presses against the upper inner wall of the elastic bellows, and the lower end of the adjusting rod presses against the upper end of the pressure regulating valve core.

2. A pressure reducing valve for conveniently adjusting pressure according to claim 1, characterized in that: The pressure regulating valve core comprises a conical body, which is small at the top and large at the bottom. The upper end of the conical body extends into the pressure regulating port to play a sealing role.

3. A pressure reducing valve for conveniently adjusting pressure according to claim 2, characterized in that: The pressure regulating valve core also includes a limit shaft formed below the conical body, a compression spring is sleeved outside the limit shaft, the upper end of the compression spring abuts against the lower end of the conical body, and the lower end of the compression spring abuts against the base of the valve body.

4. A pressure reducing valve for conveniently adjusting pressure according to claim 2, characterized in that: The conical body is made of polytetrafluoroethylene.

5. A pressure reducing valve for conveniently adjusting pressure according to claim 2, characterized in that: The upper end of the pressure regulating valve core is formed with a limiting hole for the lower end of the regulating rod to be inserted, and the limiting hole matches the lower end of the regulating rod.

6. A pressure reducing valve for conveniently adjusting pressure according to claim 1, characterized in that: The guide member comprises a cylindrical body, a guide hole is provided in the middle of the cylindrical body, a convex edge extends circumferentially from the middle of the cylindrical body, a step matching the convex edge is formed in the adjustment channel, and a retaining spring is provided to fix the convex edge, and the adjustment rod passes through the guide hole.

7. A pressure reducing valve for conveniently adjusting pressure according to claim 1, characterized in that: The upper end surface of the elastic bellows is recessed downward to form a limiting groove, and the lower end of the adjusting spring is arranged in the limiting groove.

8. A pressure reducing valve for conveniently adjusting pressure according to claim 7, characterized in that: A limiting column is formed at the lower end of the spring seat, and the upper end of the adjusting spring is sleeved outside the limiting column.

9. A pressure reducing valve for conveniently adjusting pressure according to claim 1, characterized in that: The upper end of the adjusting seat is formed with a screw hole matching the adjusting screw rod, the adjusting screw rod is sleeved with a fixing nut, and the fixing nut is arranged above the screw hole.

10. A pressure reducing valve for conveniently adjusting pressure according to claim 1, characterized in that: A hand-held part is fixed on the upper end of the adjusting screw.

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