Precise pressure regulating valve

Abstract

The utility model relates to the technical field of pressure regulating valves, in particular to a precise pressure regulating valve which comprises an upper shell and a lower shell, the lower shell is arranged at the lower end of the upper shell, a second fixing nut is arranged in the upper shell, and a rotating shaft is connected into the second fixing nut in a penetrating mode. A straight knurled rotary knob is arranged at the upper end of the rotating shaft, the straight knurled rotary knob and the rotating shaft are fixed through a fastening screw, and the surface of the second fixing nut is in threaded connection with a first fixing nut. The main function of the device is to adjust the pressure of the incoming gas, so that the outgoing gas can be stabilized at the set pressure required by a customer, the gas circulating in a common pipeline is easily influenced by the external temperature and expands or shrinks, and the change of the gas is easy to change the air pressure in the pipeline. And the situation that pressure is difficult to stably apply due to different air pressure flow speeds in the pipeline is avoided, and the air pressure accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure regulating valves, in particular to a precision pressure regulating valve. Background Art

[0002] The pressure regulating valve is also called self-operated balancing valve, flow control valve, flow controller, dynamic balancing valve, and flow balancing valve. It is an intuitive and simple flow regulation control device. The flow regulating valve used in the pipeline network can directly set the flow according to the design. The valve can automatically eliminate the flow deviation caused by the residual pressure head and pressure fluctuation of the pipeline under the action of water. No matter how the system pressure changes, the set flow is maintained unchanged. These functions of the valve enable the pipeline network flow regulation to be completed at one time, turning the network adjustment work into a simple flow distribution, and effectively solving the hydraulic imbalance of the pipeline network.

[0003] Prior art includes a utility model with publication number CN112762209A, which discloses a precision pressure regulating valve. The patent adopts an adjusting screw, a valve sleeve, a valve body, a diaphragm, a nozzle, a ejector pin and a needle seat. Under a certain input pressure, the adjusting screw is made to compress the first elastic member according to the required output pressure, thereby applying pressure to the diaphragm, and then the pressure is transmitted to the second elastic member through the ejector pin and the needle seat. The second elastic member is compressed, and the needle seat drives the sealing element to move downward, thereby forming a gap between the needle seat and the nozzle. The input gas flows through the gap between the needle seat and the nozzle, and the pressure changes. The gas entering the lower chamber of the diaphragm exerts a force on the diaphragm, so that the pressure of the entire system is balanced. At this time, the output pressure of the gas is the required output pressure. The utility model device solves the problems of the detector gas path control valve body in the prior art, which has a large dead volume, poor balancing speed and adjustment linearity, and is prone to the presence of volatile substances, resulting in gas path pressure fluctuations, which can easily affect the experimental results and reduce the accuracy of the experimental results.

[0004] In daily work, when the equipment is regulating the fluid in the pipeline, the gas flowing in the pipeline is easily affected by the external temperature and expands or contracts. The change of gas is easy to change the air pressure inside the pipeline, resulting in different air pressure and flow rate inside the pipeline, making it difficult to apply stable pressure. Utility Model Content

[0005] The utility model aims to solve the problem in the prior art that the gas flowing in the pipe temporal part is easy to be moved, resulting in unstable pressure, and proposes a precise pressure regulating valve.

[0006] To achieve the above object, the utility model adopts the following technical solution: A precision pressure regulating valve, comprising an upper housing and a lower housing. The lower housing is provided at the lower end of the upper housing. A second fixing nut is provided inside the upper housing. A rotating shaft penetrates through the inside of the second fixing nut. A knurled knob is provided at the upper end of the rotating shaft. The knurled knob and the rotating shaft are fixed by a fastening screw. A first fixing nut is threadedly connected to the surface of the second fixing nut, and the first fixing nut is provided on the surfaces of the second fixing nut and the upper housing. An adjusting slider is provided on the surface of the rotating shaft, and the adjusting slider and the rotating shaft are connected by a pin. A spring fixing ring is provided at the lower end of the rotating shaft. A first spring is sleeved on the surface of the rotating shaft. Two ends of the first spring are respectively provided on the lower surface of the adjusting slider and the upper surface of the spring fixing ring. A pressure regulating diaphragm is provided on the lower surface of the spring fixing ring. A second sealing ring is provided on the surface of the pressure regulating diaphragm. A rivet is provided inside the pressure regulating diaphragm.

[0007] Further, the top of the rivet contacts the lower surface of the spring fixing ring, and a third fixing nut is provided on the lower surface of the rivet.

[0008] Further, a first sealing ring is sleeved on the surface of the third fixing nut, and a thimble is provided inside the third fixing nut.

[0009] Further, a first O-ring is provided at the connection between the thimble and the third fixing nut, and a fourth fixing nut is provided at the lower end of the thimble.

[0010] Further, a second spring is sleeved on the surface of the thimble. Two ends of the second spring are respectively fixedly connected to the surface of the thimble and the inside of the fourth fixing nut. A sintered copper filter element is provided at the bottom of the fourth fixing nut.

[0011] Further, a second air outlet joint is provided on the side of the lower housing, and an air inlet joint and a first air outlet joint are respectively provided at the lower end of the lower housing.

[0012] Further, second O-rings are respectively provided at the connections between the air inlet joint, the first air outlet joint and the second air outlet joint and the lower housing.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are as follows:

[0014] 1. In the utility model, when the user needs to adjust the air pressure in the pipeline, the user first rotates the straight-grain knurled knob clockwise to drive the rotating shaft to rotate, and then the rotating shaft drives the adjustment slider to move downward, and the pressure output is controlled by adjusting the elastic force of the first spring. The gas enters from the air inlet pipe joint and exits from the first air outlet pipe joint and the second air outlet pipe joint. If a single output is required, one of the air outlet pipe joints can be blocked to adjust the air pressure in the pipeline; the pressure regulating gasket plays a pressure stabilizing role in the entire product; the main function of the equipment is to adjust the pressure of the incoming gas so that the outgoing gas can be stabilized at the set pressure desired by the customer. Generally, the gas circulating in the pipeline is easily affected by the external temperature and expands or contracts. The change of gas is easy to change the air pressure inside the pipeline, resulting in different air pressure and flow rates inside the pipeline, making it difficult to apply stable pressure, thereby improving the accuracy of the air pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional structural schematic diagram of a precision pressure regulating valve is proposed for the utility model;

[0016] Figure 2 A cross-sectional structural schematic diagram of a precision pressure regulating valve is proposed for the utility model;

[0017] Figure 3 The utility model proposes a precision pressure regulating valve Figure 2 Schematic diagram of the structure at A in the middle;

[0018] Figure 4 The utility model provides a schematic diagram of the internal structure of a precision pressure regulating valve.

[0019] Legend: 1. Straight knurled knob; 2. Fastening screw; 3. First fixing nut; 4. Upper housing; 5. Second fixing nut; 6. Rotating shaft; 7. Pin; 8. Adjusting slider; 9. First spring; 10. Spring fixing ring; 11. Pressure regulating diaphragm; 12. Rivet; 13. Third fixing nut; 14. First sealing ring; 15. First O-ring; 16. Ejector pin; 17. Second spring; 18. Fourth fixing nut; 19. Sintered copper filter element; 20. Second sealing ring; 21. Lower housing; 22. Second O-ring; 23. Inlet pipe joint; 24. First outlet pipe joint; 25. Second outlet pipe joint. DETAILED DESCRIPTION

[0020] See also Figures 1-4 The utility model provides a technical solution: a precision pressure regulating valve, comprising an upper shell 4 and a lower shell 21, wherein the lower end of the upper shell 4 is provided with the lower shell 21.

[0021] The following is a detailed description of the specific settings and functions of the device.

[0022] In this implementation: Inside the upper housing 4, a second fixing nut 5 is provided. A rotating shaft 6 passes through the inside of the second fixing nut 5. At the upper end of the rotating shaft 6, a knurled knob 1 is provided. The knurled knob 1 and the rotating shaft 6 are fixed by a fastening screw 2. The surface of the second fixing nut 5 is threadedly connected to a first fixing nut 3. The first fixing nut 3 is provided on the surfaces of the second fixing nut 5 and the upper housing 4. An adjustment slider 8 is provided on the surface of the rotating shaft 6. The adjustment slider 8 and the rotating shaft 6 are connected by a pin 7. At the lower end of the rotating shaft 6, a spring fixing ring 10 is provided. A first spring 9 is sleeved on the surface of the rotating shaft 6. The two ends of the first spring 9 are respectively provided on the lower surface of the adjustment slider 8 and the upper surface of the spring fixing ring 10. At the lower surface of the spring fixing ring 10, a pressure regulating diaphragm 11 is provided. A second sealing ring 20 is provided on the surface of the pressure regulating diaphragm 11. A rivet 12 is provided inside the pressure regulating diaphragm 11. The pressure regulating diaphragm 11 plays a role in stabilizing the pressure in the whole product. The main function of the device is to adjust the pressure of the incoming gas so that the outgoing gas can be stably set to the pressure desired by the customer.

[0023] Specifically, the top of the rivet 12 contacts the lower surface of the spring fixing ring 10. A third fixing nut 13 is provided on the lower surface of the rivet 12. The spring fixing ring 10 is provided to position the first spring 9 and facilitate applying pressure to the first spring 9.

[0024] Specifically, a first sealing ring 14 is sleeved on the surface of the third fixing nut 13. A thimble 16 is provided inside the third fixing nut 13. The first sealing ring 14 is provided to facilitate the tight combination of the third fixing nut 13 with the inside of the lower housing 21.

[0025] Specifically, a first O-ring 15 is provided at the connection between the thimble 16 and the third fixing nut 13. A fourth fixing nut 18 is provided at the lower end of the thimble 16. The first O-ring 15 is provided to seal the connection between the thimble 16 and the third fixing nut 13, reducing the situation that gas inside the pipeline enters the device through the thimble 16 due to a gap between the thimble 16 and the third fixing nut 13, resulting in air leakage.

[0026] Specifically, a second spring 17 is sleeved on the surface of the thimble 16. The two ends of the second spring 17 are respectively fixedly connected to the surface of the thimble 16 and the inside of the fourth fixing nut 18. A sintered copper filter element 19 is provided at the bottom of the fourth fixing nut 18.

[0027] Specifically, a second air outlet joint 25 is provided on the side of the lower housing 21. An air inlet joint 23 and a first air outlet joint 24 are respectively provided at the lower end of the lower housing 21.

[0028] Specifically, second O-rings 22 are respectively provided at the connections between the air inlet pipe joint 23, the first air outlet pipe joint 24, the second air outlet pipe joint 25 and the lower shell 21. The second O-rings 22 can be provided to seal the connections between the air inlet pipe joint 23, the first air outlet pipe joint 24, the second air outlet pipe joint 25 and the lower shell 21.

[0029] Working principle: When the user needs to adjust the air pressure in the pipeline, the user first rotates the straight-grain knurled knob 1 clockwise to drive the rotating shaft 6 to rotate, and then the rotating shaft 6 drives the adjustment slider 8 to move downward, and the pressure output is controlled by adjusting the elastic force of the first spring 9. The gas enters from the air inlet pipe joint 23 and exits from the first air outlet pipe joint 24 and the second air outlet pipe joint 25. If a single output is desired, one of the air outlet pipe joints can be blocked to adjust the air pressure in the pipeline; the pressure regulating diaphragm 11 plays a pressure stabilizing role in the entire product; the main function of the equipment is to adjust the pressure of the incoming gas so that the outgoing gas can be stabilized at the set pressure desired by the customer. Generally, the gas flowing in the pipeline is easily affected by the external temperature and expands or contracts. The change of gas is easy to change the air pressure inside the pipeline, resulting in different air pressure and flow rates inside the pipeline, making it difficult to apply stable pressure, thereby improving the accuracy of the air pressure.

Claims

1. A precision pressure regulating valve, comprising an upper housing (4) and a lower housing (21), characterized in that: A lower shell (21) is arranged at the lower end of the upper shell (4), a second fixing nut (5) is arranged inside the upper shell (4), a rotating shaft (6) is connected through the inside of the second fixing nut (5), a straight knurled knob (1) is arranged at the upper end of the rotating shaft (6), the straight knurled knob (1) and the rotating shaft (6) are fixed by a fastening screw (2), a first fixing nut (3) is threadedly connected on the surface of the second fixing nut (5), the first fixing nut (3) is arranged on the surface of the second fixing nut (5) and the upper shell (4), and a screw thread is arranged on the surface of the rotating shaft (6). An adjusting slider (8) is provided, wherein the adjusting slider (8) is connected to a rotating shaft (6) via a pin (7), a spring fixing ring (10) is provided at the lower end of the rotating shaft (6), a first spring (9) is sleeved and connected to the surface of the rotating shaft (6), two ends of the first spring (9) are respectively provided on the lower surface of the adjusting slider (8) and the upper surface of the spring fixing ring (10), a pressure regulating diaphragm (11) is provided on the lower surface of the spring fixing ring (10), a second sealing ring (20) is provided on the surface of the pressure regulating diaphragm (11), and a rivet (12) is provided inside the pressure regulating diaphragm (11).

2. A precision pressure regulating valve according to claim 1, characterized in that: The top of the rivet (12) contacts the lower surface of the spring fixing ring (10), and the lower surface of the rivet (12) is provided with a third fixing nut (13).

3. A precision pressure regulating valve according to claim 2, characterized in that: A first sealing ring (14) is sleeved and connected on the surface of the third fixing nut (13), and a ejector pin (16) is arranged inside the third fixing nut (13).

4. A precision pressure regulating valve according to claim 3, characterized in that: A first O-ring (15) is provided at the connection between the ejector pin (16) and the third fixing nut (13), and a fourth fixing nut (18) is provided at the lower end of the ejector pin (16).

5. A precision pressure regulating valve according to claim 4, characterized in that: A second spring (17) is sleeved and connected to the surface of the ejector pin (16), and two ends of the second spring (17) are respectively fixedly connected to the surface of the ejector pin (16) and the inside of a fourth fixing nut (18), and a sintered copper filter element (19) is provided at the bottom of the fourth fixing nut (18).

6. A precision pressure regulating valve according to claim 1, characterized in that: A second air outlet pipe joint (25) is provided on the side of the lower shell (21), and an air inlet pipe joint (23) and a first air outlet pipe joint (24) are respectively provided at the lower end of the lower shell (21).

7. A precision pressure regulating valve according to claim 6, characterized in that: Second O-rings (22) are respectively provided at the connection points between the air inlet pipe joint (23), the first air outlet pipe joint (24), the second air outlet pipe joint (25) and the lower housing (21).

Images