Needle valve with energy dissipation function

Abstract

The utility model discloses a needle valve with energy dissipation function relates to valve technical field, including drive mechanism, valve stem, valve body and valve seat, and drive mechanism is supported on the valve body through drive mounting seat, and valve stem penetrates drive mounting seat and extends into the valve body, and the inlet and outlet are seted up on the valve body, and the valve seat is installed at the valve body close to the export, the needle valve core outer periphery integral type of valve stem lower extreme is equipped with the tubular structure, when drive mechanism drives valve stem to move up and down relative to the valve body, the outer wall of tubular structure and the inner hole of valve seat slide fit, is equipped with the outer sealing surface on the outer wall of tubular structure, is used for the cooperation setting inner sealing surface on the mouth of valve seat, along the circumference direction of tubular structure and distribute several throttle holes, and each throttle hole all penetrates the cylinder wall of tubular structure, and along the axial direction of tubular structure forms several levels. The utility model is equipped with the mesh throttling hole, along with the adjustment of valve opening, adjusts the flow of valve, through the different opening of valve, adjusts the number of energy dissipation hole.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a needle valve with energy dissipation function. Background Technology

[0002] Pumped storage power stations often use needle valves, but due to unreasonable energy dissipation structures, noise and vibration are generated during equipment operation, affecting the safe operation of the unit. Typically, a throttling orifice plate is installed at the valve outlet. However, because the calculation of the orifice plate deviates from the actual operating conditions, it is necessary to test the orifice plate in the pipeline to fully meet the requirements and correct the orifice. Since the orifice plate has a fixed opening size, it cannot meet the needs when the valve pressure changes. Existing technology also includes a scheme with an adjustable valve at the outlet, but under strong fluid impact or when the fluid contains sediment, the valve's adjustment structure risks jamming. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a needle valve with energy dissipation function. A cylindrical structure with mesh-like throttling orifices is provided at the sealing end of the valve stem. This allows for adjustment of the valve flow rate by changing the valve opening, and the number of energy dissipation orifices can be adjusted by varying the valve opening. Furthermore, the outer circumference of the cylindrical structure mates with the inner hole of the valve seat, effectively resisting the impact force of the fluid on the valve stem.

[0004] The purpose of this utility model is achieved through the following technical solution: This needle valve with energy dissipation function includes a drive mechanism, a valve stem, a valve body, and a valve seat. The drive mechanism is supported on the valve body by a drive mounting base. The valve stem passes through the drive mounting base and extends into the valve body. The valve body has an inlet and an outlet, and a valve seat is installed near the outlet. The needle valve core at the lower end of the valve stem has an integral cylindrical structure on its outer circumference. When the drive mechanism drives the valve stem to move up and down relative to the valve body, the outer wall of the cylindrical structure slides and engages with the inner hole of the valve seat. An outer sealing surface is provided on the outer wall of the cylindrical structure to engage with the inner sealing surface provided at the upper opening of the valve seat. Several throttling orifices are evenly distributed along the circumference of the cylindrical structure, and each throttling orifice penetrates the cylindrical wall of the cylindrical structure and forms several levels along the axial direction of the cylindrical structure. By changing the valve opening by the valve stem, the number of throttling orifices can be adjusted, thereby regulating the valve's pressure and flow rate.

[0005] As a further technical solution, a groove is opened along the axial direction on the outer wall of the upper end of the valve stem to embed a guide pin, which guides the up and down movement of the valve stem. The guide pin is fixed on the drive mounting seat.

[0006] As a further technical solution, a sealing seat is installed between the drive mounting base and the valve body, and the valve stem passes through the sealing seat to form a sliding seal.

[0007] As a further technical solution, the valve core adopts an inverted conical structure, and the cylindrical structure is located on the outer periphery of the inverted conical structure.

[0008] As a further technical solution, the drive mechanism adopts one of the following: handwheel drive, hydraulic control drive, or motor drive.

[0009] The beneficial effects of this utility model are as follows: 1. A cylindrical structure is provided at the sealing end of the valve stem, and multiple levels of mesh throttling orifices are provided. The flow rate of the valve can be adjusted by adjusting the valve opening, and the number of energy dissipation orifices can be adjusted by different valve openings. 2. The outer circle of the cylindrical structure matches the inner hole of the valve seat, which can effectively resist the impact force of the fluid on the valve stem; 3. The valve core adopts an inverted conical structure, which allows the mud and sand entering the cylindrical structure to be smoothly discharged downward from the outlet. Furthermore, the cylindrical structure (throttling orifice) for valve adjustment is located in the valve body, and the fluid will flush the throttling orifice, thus reducing the risk of jamming. 4. The drive mechanism can be manually controlled, hydraulically controlled, or electrically controlled, offering diverse and flexible drive options; 5. The up-and-down movement of the valve stem is guided by a guide pin to ensure operational stability. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the valve in the fully open state in this utility model.

[0011] Figure 2 This is a schematic diagram of the valve in the fully closed state in this utility model.

[0012] Explanation of reference numerals in the attached drawings: 1. Drive mechanism; 2. Guide pin; 3. Drive mounting base; 4. Valve stem; 5. Sealing seat; 6. Valve body; 7. Outer sealing surface; 8. Throttling orifice; 9. Inner sealing surface; 10. Valve seat; 11. Valve core; 12. Slide groove; 13. Inlet; 14. Outlet; 15. Cylindrical structure. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings: Example: As attached Figure 1 , 2 As shown, this needle valve with energy dissipation function includes a drive mechanism 1, a guide pin 2, a drive mounting base 3, a valve stem 4, a sealing seat 5, a valve body 6, an outer sealing surface 7, a throttling orifice 8, an inner sealing surface 9, a valve seat 10, a valve core 11, a slide groove 12, an inlet 13, an outlet 14, and a cylindrical structure 15.

[0014] Reference Appendix Figure 1The drive mechanism 1 is supported on the valve body 6 by the drive mounting seat 3. The valve stem 4 passes through the drive mounting seat 3 and extends into the valve body 6. Preferably, a sealing seat 5 is embedded between the sealing surfaces of the drive mounting seat 3 and the valve body 6, and the valve stem 4 forms a sliding seal after passing through the sealing seat 5.

[0015] An inlet 13 and an outlet 14 are provided on the valve body 6, and a valve seat 10 is installed on the valve body 6 near the outlet 14. Preferably, the valve seat 10 is interference-fitted with the inner wall of the valve body 6 and sealed by a sealing ring. A pressure sleeve is fixedly installed at the outlet 14 by bolts, and the pressure sleeve presses the valve seat 10 tightly onto the valve body 6.

[0016] Furthermore, a cylindrical structure 15 is integrally provided on the outer circumference of the needle valve core 11 at the lower end of the valve stem 4. When the drive mechanism 1 drives the valve stem 4 to move up and down relative to the valve body 6, the outer wall of the cylindrical structure 15 slides in cooperation with the inner hole of the valve seat 10. An outer sealing surface 7 is provided on the outer wall of the cylindrical structure 15, and an inner sealing surface 9 is provided at the upper opening of the valve seat 10. The outer sealing surface 7 and the inner sealing surface 9 seal through contact, thereby achieving the closure of the needle valve. Figure 2 As shown.

[0017] Furthermore, a plurality of throttling holes 8 are evenly distributed along the circumference of the cylindrical structure 15, and each throttling hole 8 penetrates the cylindrical wall of the cylindrical structure 15, such as... Figure 1 As shown, when the valve is in the open state, the fluid enters the valve body 6 from the inlet 13, and then the fluid impacts the outer wall of the cylindrical structure 15, which can achieve energy dissipation.

[0018] Furthermore, the throttling orifices 8 are distributed along the axial direction of the cylindrical structure 15 to form several levels, such as... Figure 1 , 2 As shown in the figure, the throttling orifice 8 is provided with four layers forming a mesh (in this embodiment, it is four layers, but it can also be other numbers, depending on the pressure and flow rate under actual working conditions). By changing the valve opening degree through the valve stem 4, the number of throttling orifices 8 that are open can be adjusted, thereby regulating the pressure and flow rate of the valve.

[0019] Preferably, a groove 12 is formed along the axial direction on the outer wall of the upper end of the valve stem 4, one end of the guide pin 2 is fixed on the drive mounting base 3, and the other end of the guide pin 2 is embedded in the groove 12 to guide the up and down movement of the valve stem 4 and improve the stability during operation.

[0020] Preferably, the valve core 11 adopts an inverted conical structure, and the cylindrical structure 15 is located on the outer periphery of the inverted conical structure, allowing the mud and sand entering the cylindrical structure to be smoothly discharged downwards from the outlet. Furthermore, the cylindrical structure (throttling orifice) for valve adjustment is located within the valve body, and the fluid flushes the throttling orifice, reducing the risk of jamming. In addition, because the outer circle of the cylindrical structure matches the inner hole of the valve seat, it can effectively resist the impact force of the fluid on the valve stem.

[0021] Furthermore, the drive mechanism 1 can be one of handwheel drive, hydraulic control drive, or motor drive, offering diverse and flexible driving options.

[0022] The working process of this utility model: When the valve is in operation, the valve stem 4 is driven to move up and down relative to the valve body 6 by the drive mechanism 1. At the same time, the outer wall of the cylindrical structure 15 slides in contact with the inner hole of the valve seat 10. When the outer sealing surface 7 on the outer wall of the cylindrical structure 15 is in complete contact with the inner sealing surface 9 at the upper opening of the valve seat 10, the needle valve is in the closed state. Figure 2 As shown in the figure, the throttling orifice 8 in this embodiment has four layers, forming a mesh structure. By changing the valve opening through the valve stem 4, and with the inner hole of the valve seat 10 cooperating with the cylindrical structure 15 to block the different layers of throttling orifices 8, the number of throttling orifices 8 that are open can be adjusted. When the valve is in the open state, the fluid enters the valve body 6 from the inlet 13, and then the fluid impacts the outer wall of the cylindrical structure 15, thus achieving energy dissipation.

[0023] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this utility model should fall within the protection scope of the appended claims.

Claims

1. A needle valve with energy dissipation function, characterized in that: The valve body includes a drive mechanism (1), a valve stem (4), a valve body (6), and a valve seat (10). The drive mechanism (1) is supported on the valve body (6) by a drive mounting base (3). The valve stem (4) passes through the drive mounting base (3) and extends into the valve body (6). The valve body (6) has an inlet (13) and an outlet (14), and the valve seat (10) is installed on the valve body (6) near the outlet (14). The needle valve core (11) at the lower end of the valve stem (4) has an integral cylindrical structure (15) on its outer circumference. The drive mechanism (1) drives the valve stem (4) to move up and down relative to the valve body (6). When in motion, the outer wall of the cylindrical structure (15) slides in fit with the inner hole of the valve seat (10). An outer sealing surface (7) is provided on the outer wall of the cylindrical structure (15) to fit with the inner sealing surface (9) provided at the upper opening of the valve seat (10). Several throttling holes (8) are evenly distributed along the circumference of the cylindrical structure (15), and each throttling hole (8) penetrates the cylindrical wall of the cylindrical structure (15) and forms several levels along the axial direction of the cylindrical structure (15). The valve opening is changed by the valve stem (4) to adjust the number of throttling holes (8) opening, thereby adjusting the pressure and flow of the valve.

2. The needle valve with energy dissipation function according to claim 1, characterized in that: The upper end of the valve stem (4) has an axial groove (12) on its outer wall for embedding a guide pin (2) to guide the up and down movement of the valve stem (4). The guide pin (2) is fixed on the drive mounting seat (3).

3. The needle valve with energy dissipation function according to claim 1, characterized in that: A sealing seat (5) is installed between the drive mounting base (3) and the valve body (6), and the valve stem (4) passes through the sealing seat (5) to form a sliding seal.

4. The needle valve with energy dissipation function according to claim 1, characterized in that: The valve core (11) adopts an inverted conical structure, and the cylindrical structure (15) is located on the outer periphery of the inverted conical structure.

5. The needle valve with energy dissipation function according to claim 1, characterized in that: The drive mechanism (1) adopts one of handwheel drive, hydraulic control drive, or motor drive.

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