A precision pressure reducing valve

Abstract

This application relates to the field of pressure reducing valve technology, and in particular to a precision pressure reducing valve, which includes a valve body with inlet and outlet pipes on both sides. The valve body contains a flexible buffer adjustment structure, a valve stem and valve core, a self-compensating sealing structure, an eccentric cam fine-tuning mechanism at the bottom, a diaphragm and adjusting spring on the outlet pipe, and an adjusting screw at the top. The flexible buffer adjustment structure buffers fluid impact, the self-compensating sealing structure ensures a good seal, and the eccentric cam fine-tuning mechanism and adjusting screw work together to achieve precise pressure regulation. This precision pressure reducing valve effectively solves the problems of easy wear of components, poor sealing, and unstable pressure regulation in traditional pressure reducing valves, and is suitable for industrial production and fluid control fields with stringent pressure control requirements.

Description

Technical Field

[0001] This application relates to the field of pressure reducing valve technology, and in particular to a precision pressure reducing valve. Background Technology

[0002] Precise pressure control is crucial in industrial production and numerous fluid control applications. Traditional pressure-reducing valves present several problems in practical applications. For example, when fluid enters from the inlet pipe, the sudden changes in flow rate and pressure can cause significant impact on the valve's internal structure. This not only easily leads to wear on valve components and reduces the valve's service life but may also affect the stability and accuracy of pressure regulation. Moreover, existing pressure-reducing valves have poor sealing performance between the valve core and body. With increased use, the sealing performance gradually declines, making leakage prone to occur. This is unacceptable in scenarios with strict requirements for fluid purity and pressure control.

[0003] Therefore, a precision pressure reducing valve has been invented to solve the problems mentioned in the background art. Utility Model Content

[0004] This utility model provides a precision pressure reducing valve, which aims to solve the problems of unstable pressure control and short equipment life caused by fluid impact, poor sealing and low adjustment accuracy when traditional pressure reducing valves are used in industrial production and fluid control fields.

[0005] This application provides a precision pressure reducing valve, employing the following technical solution: It includes a valve body, wherein an inlet pipe and an outlet pipe are respectively provided on both sides of the valve body; a flexible buffer adjustment structure is disposed within the inlet pipe of the valve body; a valve stem is disposed within the valve body; a valve core is disposed on the valve stem; a self-compensating sealing structure is disposed within the valve body for sealing between the valve core and the valve body; an eccentric cam fine-tuning mechanism is disposed at the bottom of the valve body for limiting the movement position of the valve core; a diaphragm is disposed in the outlet pipe of the valve body; an adjusting spring is disposed at the top of the diaphragm; an adjusting screw is disposed at the top of the valve body; the adjusting screw is threadedly connected to the valve body; and the bottom of the adjusting screw is in contact with the adjusting spring.

[0006] Optionally, the flexible buffer adjustment structure includes a plurality of flexible buffer sheets connected in sequence, each of the flexible buffer sheets being connected by an elastic connector, a gap being provided between the flexible buffer sheet and the inlet pipe, and an elastic connecting rope being connected between the flexible buffer sheet and the inlet pipe.

[0007] Optionally, the flexible buffer sheet is in the shape of a circular flat plate, and its diameter decreases from the inlet pipe near the valve body to the outlet pipe, and a first compression spring is connected between two adjacent flexible buffer sheets.

[0008] Optionally, the self-compensating sealing structure includes a sealing ring, an elastic compensation ring is provided on the outer side of the sealing ring, the elastic compensation ring is fixed in the valve body, and the inner side of the sealing ring is tightly fitted to the valve core surface.

[0009] Optionally, the eccentric cam fine-tuning mechanism includes an eccentric cam, a rotatable rotating rod is provided at the bottom of the valve body, the eccentric cam is slidably connected to the rotating rod, a first rotating handle is provided at one end of the rotating rod, and a contact end is provided at the bottom of the valve rod, the contact end being in contact with the eccentric cam.

[0010] In summary, this application includes the following beneficial technical effects: 1. Buffering and shock resistance: The flexible buffer regulating structure consists of multiple flexible buffer plates with decreasing diameters connected in sequence by elastic connectors (such as the first compression spring). It can effectively buffer the high-speed and high-pressure impact when the fluid enters, reduce the wear on the internal parts of the valve, extend the service life of the valve, and ensure the stability of the pressure regulation process. 2. High-efficiency sealing: The sealing ring in the self-compensating sealing structure fits tightly to the valve core on the inner side and is supported by an elastic compensation ring on the outer side. This design can automatically compensate for the seal as the valve core moves, greatly improving the sealing performance, effectively preventing leakage, and meeting the production requirements for strict control of fluid purity and pressure. 3. Precise adjustment: The eccentric cam fine adjustment mechanism drives the rotating rod by rotating the first rotary handle, so that the eccentric cam slides on the rotating rod, changing the contact position with the bottom of the valve stem, thereby achieving precise limitation of the valve core movement position, thus meeting the stringent requirements of high-precision pressure control scenarios. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the device. Figure I ; Figure 2 This is the front view of the device; Figure 3 This is a cross-sectional schematic diagram of the overall structure of this device; Figure 4 This is a schematic diagram of the components inside the valve body of this device; Figure 5 This is a schematic diagram of the flexible buffer adjustment structure of this device; Among them, 1. Valve body, 2. Inlet pipe, 3. Outlet pipe, 4. Flexible buffer adjustment structure, 5. Valve stem, 6. Valve core, 7. Self-compensating sealing structure, 8. Eccentric cam fine adjustment mechanism, 9. Diaphragm, 10. Adjusting spring, 11. Adjusting screw, 12. Flexible buffer plate, 13. Elastic connecting rope, 14. First spring, 15. Sealing ring, 16. Elastic compensation ring, 17. Eccentric cam, 18. Rotating rod, 19. First rotating handle, 20. Contact end. Detailed Implementation

[0012] The present application will be further described in detail below with reference to the accompanying drawings. In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model.

[0013] Reference Figure 1 , Figure 3 , Figure 5 One embodiment shown is a precision pressure reducing valve including a valve body 1. In this embodiment, the valve body 1 serves as the basic structure of the entire pressure reducing valve, providing space for the installation and support of other components. An inlet pipe 2 and an outlet pipe 3 are respectively provided on both sides of the valve body 1. The inlet pipe 2 is for fluid inflow, and the outlet pipe 3 is for fluid outflow after pressure reduction and regulation. This arrangement allows the fluid to flow within the valve body 1 along a predetermined path. A flexible buffer regulating structure 4 is provided within the inlet pipe 2 of the valve body 1. The flexible buffer regulating structure 4 is connected to the inlet pipe 2. When fluid enters the valve body 1 from the inlet pipe 2, it first impacts the flexible buffer regulating structure 4. Its function is to buffer the impact caused by sudden changes in flow rate and pressure when the fluid enters, reducing damage to the internal structure of the valve and ensuring the stability of subsequent pressure regulation. A valve stem 5 is also provided within the valve body 1. The valve stem 5 is slidably installed within the valve body 1 and can move within a certain range. A valve core 6 is provided on the valve stem 5, and the valve core 6 is fixedly connected to the valve stem 5. The movement of the valve stem 5 will drive the movement of the valve core 6, thereby achieving the regulation of fluid flow rate and pressure. A self-compensating sealing structure 7 is installed inside the valve body 1, surrounding the gap between the valve core 6 and the valve body 1 to seal the gap. This effectively prevents fluid leakage from the gap between the valve core 6 and the valve body 1, ensuring the normal operation of the pressure reducing valve and the accuracy of pressure regulation. An eccentric cam fine-tuning mechanism 8 is installed at the bottom of the valve body 1, cooperating with the bottom of the valve stem 5 to limit the movement position of the valve core 6. By operating the eccentric cam fine-tuning mechanism 8, the position of the valve core 6 can be precisely controlled, thereby achieving precise regulation of the pressure in the outlet pipeline 3.

[0014] A diaphragm 9 is fixedly connected to the outlet pipe 3 of the valve body 1. One side of the diaphragm 9 is in contact with the fluid in the outlet pipe 3, and the other side is in contact with an adjusting spring 10. An adjusting spring 10 is located on the top of the diaphragm 9, with one end in contact with the diaphragm 9 and the other end in contact with an adjusting screw 11. An adjusting screw 11 is located on the top of the valve body 1 and is threadedly connected to the valve body 1. This threaded connection allows the adjusting screw 11 to move up and down on the valve body 1 when rotated. The bottom of the adjusting screw 11 is in contact with the adjusting spring 10. Rotating the adjusting screw 11 changes the pressure of the adjusting spring 10 on the diaphragm 9, thereby affecting the position of the valve core 6 and ultimately regulating the pressure of the outlet pipe 3.

[0015] The implementation principle of the above embodiment is as follows: Fluid flows in from the inlet pipe 2, and after being buffered by the flexible buffer adjustment structure 4, it enters the valve body 1. The position of the valve core 6 is precisely limited by operating the eccentric cam fine-tuning mechanism 8, while rotating the adjusting screw 11 changes the pressure of the adjusting spring 10 on the diaphragm 9. The diaphragm 9 transmits the pressure change to the valve core 6, causing the valve core 6 to move, thereby regulating the flow rate and pressure of the fluid. Finally, the fluid after pressure reduction and regulation flows out from the outlet pipe 3. The self-compensating sealing structure 7 ensures a good seal between the valve core 6 and the valve body 1, preventing fluid leakage and ensuring the stability and accuracy of the entire pressure reduction process.

[0016] Reference Figure 1 , Figure 2 , Figure 5 One embodiment shown is as follows: The flexible buffer adjustment structure 4 includes multiple flexible buffer sheets 12 connected in sequence. In this embodiment, the multiple flexible buffer sheets 12 are connected in sequence to form an integral buffer structure. Each flexible buffer sheet 12 is connected by an elastic connector, which connects two adjacent flexible buffer sheets 12, so that the flexible buffer sheets 12 have a certain degree of elasticity and mobility. A gap is opened between the flexible buffer sheet 12 and the inlet pipe 2, and an elastic connecting rope 13 is connected between the flexible buffer sheet 12 and the inlet pipe 2. The elastic connecting rope 13 can be made of rubber.

[0017] When fluid impacts the flexible buffer plate 12 from the inlet pipe 2, the elastic connector absorbs and disperses the impact force of the fluid. Since the flexible buffer plates 12 are connected sequentially, the impact force of the fluid is transmitted to each flexible buffer plate 12 in turn. Through multi-stage buffering, the impact of the fluid on the internal structure of the valve is greatly reduced, protecting valve components, extending the service life of the valve, and improving the stability of pressure regulation.

[0018] The implementation principle of the above embodiment is as follows: After the fluid enters the inlet pipe 2, it impacts the first flexible buffer plate 12. Under the action of the elastic connector, the flexible buffer plate 12 deforms to a certain extent, absorbing part of the impact force. Then the impact force is transmitted to the next flexible buffer plate 12, and so on. After being buffered step by step by multiple flexible buffer plates 12, the impact force of the fluid is greatly reduced, and it enters the valve body 1 in a relatively stable state, creating good conditions for subsequent pressure regulation.

[0019] Reference Figure 5 One embodiment is shown whereby the flexible buffer plate 12 is a circular flat plate, with its diameter decreasing from the inlet pipe 2 near the valve body 1 to the outlet pipe 3. A first compression spring 14 is fixedly connected between two adjacent flexible buffer plates 12. In this embodiment, the circular flat plate shape of the flexible buffer plate 12 facilitates installation and fluid impact dispersion. The decreasing diameter design allows the fluid to gradually change its flow direction and speed as it passes through the flexible buffer plate 12, further enhancing the buffering effect. The first compression spring 14 is connected between two adjacent flexible buffer plates 12. When the fluid impacts the flexible buffer plate 12, the first compression spring 14 is compressed or stretched, providing elastic buffering. Simultaneously, the elasticity of the first compression spring 14 allows the flexible buffer plate 12 to return to its original position after being impacted, ensuring the stability and repeatability of the buffer structure.

[0020] The implementation principle of the above embodiment is as follows: Fluid enters from the inlet pipe 2 and initially impacts the larger-diameter flexible buffer plate 12. Under the impact of the fluid, the flexible buffer plate 12 compresses the first compression spring 14, absorbing part of the impact force. As the fluid flows towards the outlet pipe 3, it sequentially impacts the flexible buffer plates 12 with gradually decreasing diameters. Each flexible buffer plate 12 and the first compression spring 14 plays a buffering role, gradually weakening the impact force of the fluid. Through this method of decreasing diameter and buffering by the first compression spring 14, the impact of the fluid on the internal structure of the valve is effectively reduced, improving the valve's service life and the stability of pressure regulation.

[0021] Reference Figure 3 One embodiment shown is as follows: The self-compensating sealing structure 7 includes a sealing ring 15, which is fixedly disposed in the gap between the valve core 6 and the valve body 1. In this embodiment, an elastic compensation ring 16 is disposed on the outer side of the sealing ring 15. The elastic compensation ring 16 is fixed inside the valve body 1 and provides support and elastic compensation for the sealing ring 15. The inner side of the sealing ring 15 is tightly fitted to the surface of the valve core 6. The elastic compensation ring 16 can automatically adjust the position and pressure of the sealing ring 15 as the valve core 6 moves and wears, ensuring that the sealing ring 15 is always tightly fitted to the valve core 6, thus achieving a self-compensating seal.

[0022] The implementation principle of the above embodiment is as follows: When the fluid flows in the valve body 1, it will generate pressure on the gap between the valve core 6 and the valve body 1. At the same time, since the valve core 6 may wear or change position during long-term use, the elastic compensation ring 16 will automatically adjust the position and pressure of the sealing ring 15 according to these changes to ensure that the sealing ring 15 and the valve core 6 always maintain a good sealing state, prevent fluid leakage, and ensure the normal operation of the pressure reducing valve and the accuracy of pressure regulation.

[0023] Reference Figure 4 One embodiment shown is as follows: the eccentric cam fine-tuning mechanism 8 includes an eccentric cam 17, and a rotatable rotating rod 18 is rotatably connected to the bottom of the valve body 1. The eccentric cam 17 is rotatably connected inside the valve body 1 and is slidably connected to the rotating rod 18. In this embodiment, the rotating rod 18 is installed at a specific position at the bottom of the valve body 1 and can rotate around its own axis. The eccentric cam 17 and the rotating rod 18 are engaged by a slidable connection, and the rotation of the rotating rod 18 can drive the eccentric cam 17 to move.

[0024] A first rotary handle 19 is provided at one end of the rotating rod 18, which can be rotated by the operator to drive the rotating rod 18 to rotate. A contact end 20 is provided at the bottom of the valve stem 5, which is in contact with the eccentric cam 17. When the first rotary handle 19 is rotated to move the eccentric cam 17, the eccentric cam 17 will push or pull the contact end 20 at the bottom of the valve stem 5, thereby changing the position of the valve stem 5 and thus limiting the movement position of the valve core 6.

[0025] The implementation principle of the above embodiment is as follows: The operator rotates the first rotating handle 19, causing the rotating rod 18 to rotate. The rotation of the rotating rod 18 causes the eccentric cam 17 to slide on it. Due to the eccentric structure of the eccentric cam 17, its movement causes a change in the contact position with the bottom contact end 20 of the valve stem 5, thereby pushing or pulling the valve stem 5 to move. The movement of the valve stem 5 drives the valve core 6 to move, achieving precise adjustment of the position of the valve core 6, and ultimately achieving precise control of the pressure of the outlet pipeline 3. This eccentric cam fine-tuning mechanism 8 can achieve minute adjustments to the position of the valve core 6, meeting the application scenarios with high requirements for pressure regulation accuracy.

[0026] The working principle of this device is as follows: fluid flows in from the inlet pipe 2 and first impacts the flexible buffer adjustment structure 4. This structure consists of multiple flexible buffer plates 12 connected in sequence by elastic connectors such as the first compression spring 14, with decreasing diameters. When the fluid impacts, the elastic connectors deform, gradually reducing the impact force, protecting the internal structure and allowing the fluid to smoothly enter the valve body 1.

[0027] The valve core 6 on the valve stem 5 is responsible for controlling the fluid flow. The self-compensating sealing structure 7 surrounds the valve core 6. The inner side of the sealing ring 15 is attached to the valve core 6, and the outer side is supported by the elastic compensation ring 16. It automatically compensates for the seal as the valve core 6 moves to prevent fluid leakage.

[0028] When pressure adjustment is required, the first rotary handle 19 of the eccentric cam fine-tuning mechanism 8 is rotated, and the rotating rod 18 drives the eccentric cam 17 to slide, changing the contact position with the bottom contact end 20 of the valve stem 5, thus precisely limiting the movement position of the valve core 6. At the same time, the adjusting screw 11 at the top of the valve body 1 is rotated. Because it is threadedly connected to the valve body 1, the screw rotates and moves up and down, changing the pressure of the adjusting spring 10 on the diaphragm 9. The deformation of the diaphragm 9 causes the valve core 6 to change position, thereby achieving precise control of the fluid pressure in the outlet pipe 3.

[0029] The working principle of this device has been explained through the above embodiments. These embodiments only illustrate several implementation methods of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A precision pressure reducing valve, comprising a valve body (1), characterized in that: The valve body (1) has an inlet pipe (2) and an outlet pipe (3) on its two sides respectively. The valve body (1) is provided with a flexible buffer adjustment structure (4) located in the inlet pipe (2). The valve body (1) is provided with a valve stem (5) and a valve core (6) on the valve stem (5). The valve body (1) is provided with a self-compensating sealing structure (7) for sealing between the valve core (6) and the valve body (1). The bottom of the valve body (1) is provided with an eccentric cam fine adjustment mechanism (8) for limiting the movement position of the valve core (6). The outlet pipe (3) of the valve body (1) is provided with a diaphragm (9). The top of the diaphragm (9) is provided with an adjusting spring (10). The top of the valve body (1) is provided with an adjusting screw (11). The adjusting screw (11) is threadedly connected to the valve body (1). The bottom of the adjusting screw (11) is in contact with the adjusting spring (10).

2. The precision pressure reducing valve according to claim 1, characterized in that: The flexible buffer adjustment structure (4) includes a plurality of flexible buffer sheets (12) connected in sequence. Each of the flexible buffer sheets (12) is connected by an elastic connector. A gap is provided between the flexible buffer sheet (12) and the inlet pipe (2). An elastic connecting rope (13) is connected between the flexible buffer sheet (12) and the inlet pipe (2).

3. A precision pressure reducing valve according to claim 2, characterized in that: The flexible buffer sheet (12) is in the shape of a circular plate, and its diameter decreases from the inlet pipe (2) near the valve body (1) to the outlet pipe (3). A first compression spring (14) is connected between two adjacent flexible buffer sheets (12).

4. A precision pressure reducing valve according to claim 1, characterized in that: The self-compensating sealing structure (7) includes a sealing ring (15), and an elastic compensation ring (16) is provided on the outside of the sealing ring (15). The elastic compensation ring (16) is fixed inside the valve body (1), and the inner side of the sealing ring (15) is tightly attached to the surface of the valve core (6).

5. A precision pressure reducing valve according to claim 1, characterized in that: The eccentric cam fine-tuning mechanism (8) includes an eccentric cam (17), a rotatable rotating rod (18) is provided at the bottom of the valve body (1), the eccentric cam (17) is slidably connected to the rotating rod (18), a first rotating handle (19) is provided at one end of the rotating rod (18), and a contact end (20) is provided at the bottom of the valve stem (5), the contact end (20) is in contact with the eccentric cam (17).

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