Multi-stage high water head collision energy dissipation drain valve

Abstract

A multi-stage high-water-head collision energy dissipation drain valve is composed of a valve body, an overhaul cover plate, a gate sleeve, a valve element, a valve element seat, a conical injection cap and a connecting rod, a water flow inlet is formed in the left side of the valve body, a water flow outlet is formed in the lower portion of the valve element seat, the gate sleeve moves up and down under the control of the connecting rod, and the position of the gate sleeve in the moving process determines the flow of the valve. The valve is suitable for water drainage occasions with particularly high water heads, flow regulation is more stable due to the fact that conical holes of the valve element are spirally arranged, the stability of collision energy dissipation can be improved due to the fact that spraying holes of the conical spraying caps are of a structure which is enlarged from top to bottom, the conical spraying caps have the effects of increasing flow resistance and dissipating energy, and the more the conical spraying caps are, the more the flow resistance is. The better the noise and vibration reduction effect is, but the flow can be reduced due to the use of the conical injection caps, the number of the conical injection caps can be adjusted according to actual engineering requirements in the use process, and the flow can be increased as much as possible on the premise of controlling the noise and the vibration.

Description

Technical Field

[0001] This utility model relates to the field of valves, and in particular to a multi-stage high-head collision energy dissipation drainage valve. Background Technology

[0002] High-head accumulators inevitably generate noise and vibration during decompression. Patent CN114542794B discloses a honeycomb collision energy dissipation regulating valve, comprising a valve body, a drive chamber within the valve body, a drive motor mounted on the valve body, a drive frame that moves axially under the drive motor, multiple sleeve gates arranged in a honeycomb pattern on the drive frame, and multiple perforated nozzles that cooperate with the sleeve gates to regulate flow and reduce pressure. The perforated nozzles are located at the flow channel on the outlet side of the valve body. When water flows through the small orifices, it contracts and experiences localized water loss, consuming some energy. The total flow area of ​​the multiple perforated nozzles is smaller than the flow area at the valve body outlet, causing the water to diffuse as it flows out of the nozzles, further consuming energy. The water from the multiple perforated nozzles is sprayed towards the center of the pipe, where collisions occur, achieving energy dissipation. This patented product has proven very effective in engineering practice. However, at water heads above 150 meters, noise and vibration cannot be avoided, and adjustments cannot be made according to changes in water head. Summary of the Invention

[0003] The purpose of this invention is to overcome the defects of the existing technology mentioned above. By adopting the principle of collision energy dissipation and adjusting the number of conical spray caps according to the height of the water head, the best effect can be achieved in eliminating noise and vibration while ensuring flow rate.

[0004] A multi-stage high-head collision energy dissipation drain valve consists of a valve body, an inspection cover, a gate sleeve, a valve core, a valve core seat, a conical spray cap, and a connecting rod. The left side of the valve body is the water inlet, and the lower part of the valve core seat is the water outlet. The number of conical spray caps is adjusted according to the water head height.

[0005] Furthermore, one end of the connecting rod is connected to the gate sleeve, and the other end is connected to the operating mechanism (not shown in the figure). The operating mechanism can be manual, electric, or hydraulic. A shaft seal is provided between the connecting rod and the valve body to prevent high-pressure water leakage.

[0006] Furthermore, the valve core is provided with a conical spray hole on its side. The conical spray hole is a cone with a large inlet and a small outlet. The conical spray hole is arranged in a spiral upward shape. The valve core is provided with a protrusion inside. A sealing ring is provided at the junction of the valve core and the valve body.

[0007] Furthermore, the gate sleeve moves up and down under the control of the connecting rod. During the movement of the gate sleeve, the total area of ​​the first conical spray hole changes. The total flow area of ​​the first conical spray hole determines the flow rate of the drain valve. N water-permeable holes are provided on the top of the gate sleeve, and a sealing ring is provided on the upper inner side of the gate sleeve.

[0008] Furthermore, the inspection cover is plate-shaped and is connected to the valve body flange by bolts.

[0009] Furthermore, one end of the valve core seat is connected to the valve core via a flange, and the other end is connected to the pipeline via a flange, with protrusions provided inside.

[0010] Furthermore, the conical spray cap is conical in shape, with a second conical spray hole on its side, and is installed inside the valve core and valve core seat by a protrusion.

[0011] Furthermore, the second conical nozzle is a cone with a large inlet and a small outlet, and the diameter of the second conical nozzle gradually increases from top to bottom.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] The higher the water head, the greater the pressure difference between the inside and outside of the conical nozzle, and the higher the water jet velocity. Once a certain level is reached, even with collision energy dissipation technology, it is difficult to eliminate noise and vibration. Connecting multiple conical nozzle caps in series in the pipeline can reduce the pressure difference and water jet velocity of all conical nozzles, thus achieving the purpose of eliminating noise and vibration. On the other hand, increasing the number of conical nozzle caps will reduce the flow rate. The solution of this invention, by adjusting the number of conical nozzle caps, achieves a balance between "noise and vibration elimination" and "flow rate," maximizing the valve's efficiency.

[0014] The design of the conical nozzle with a large inlet and a small outlet maximizes the flow velocity and minimizes the pressure at the outlet. The generated cavitation bubbles are quickly blown to the center of the pipeline, preventing cavitation damage to the valve. The spiral upward arrangement of the first conical nozzle makes the flow adjustment more stable. The distance between the upper end of the conical nozzle cap and the center of the pipeline is short. To effectively prevent noise and vibration, the diameter of the second conical nozzle is designed to gradually increase from top to bottom.

[0015] The product of this utility model has achieved the expected effect of reducing vibration and noise after testing by the Ningxia Feimaisen Industrial Software Technology Co., Ltd. Testing Center and the Xiluodu Hydropower Station. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the multi-stage high-head collision energy dissipation drain valve of this utility model.

[0017] Figure 2 This is an enlarged cross-sectional view of the conical spray cap of the multi-stage high-head collision energy dissipation drain valve of this utility model.

[0018] Explanation of markings in the diagram:

[0019] 1. Valve body, 2. Inspection cover plate, 3. Gate sleeve, 4. Valve core seat, 5. Conical spray cap, 6. Protrusion, 7. Conical spray hole two, 8. Sealing ring, 9. Conical spray hole one, 10. Valve core, 11. Sealing ring, 12. Water permeable hole, 13. Connecting rod, 14. Shaft seal. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] like Figure 1 As shown, this utility model provides a multi-stage high-head collision energy dissipation drain valve, which consists of a valve body 1, an inspection cover plate 2, a gate sleeve 3, a valve core 10, a valve core seat 4, a conical spray cap 5, and a connecting rod 13. The left side of the valve body 1 is the water inlet, and the lower part of the valve core seat 4 is the water outlet.

[0022] One end of the connecting rod 13 is connected to the gate sleeve 3, and the other end is connected to the operating mechanism (not shown in the figure). The operating mechanism can be manual, electric, or hydraulic. When the operating mechanism is driven by an electric motor or hydraulic system, it can automatically adjust the flow rate. A shaft seal 14 is provided between the connecting rod 13 and the valve body 1 to prevent high-pressure water leakage.

[0023] The valve core 10 has a conical nozzle 9 on its side. The conical nozzle 9 is a cone with a large inlet and a small outlet. The conical nozzle 9 is arranged in a spiral upward shape. This arrangement can make the flow control more stable. A sealing ring 8 is provided at the junction of the valve core 10 and the valve body 1. The sealing ring 8 can prevent leakage when the valve is closed. The valve core 10 and the valve body 1 are connected by welding.

[0024] The gate sleeve 3 moves up and down under the control of the connecting rod 13. During the movement, the total area of ​​the sealing conical nozzle 9 changes. The total flow area of ​​the conical nozzle 9 determines the flow rate of the drain valve. N water-permeable holes 12 are provided at the top of the gate sleeve 3. The water-permeable holes 12 can balance the internal and external pressure of the gate sleeve 3. It is not affected by the water pressure inside the valve body 1 when moving up and down. A sealing ring 11 is provided on the upper inner side of the gate sleeve 3. When the gate sleeve 3 moves to the bottom, the valve is completely closed. The sealing ring 8 and the sealing ring 11 work together to prevent leakage when the valve is closed.

[0025] like Figure 1 , Figure 2As shown, the conical spray cap 5 is conical in shape, with a second conical spray hole 7 on its side, and is mounted inside the valve core 10 and valve core seat 4 via a protrusion 6. The second conical spray hole 7 of the conical spray cap 5 is made into a funnel shape with a large inlet and a small outlet, so that the flow velocity at the outlet is maximized and the pressure is minimized, and the generated cavitation bubbles are immediately sprayed to the center of the pipe, avoiding cavitation. The distance of the water flow sprayed from the second conical spray hole 7 to the center of the pipe gradually increases from top to bottom. In order to balance the kinetic energy of the water flow collision, the diameter of the second conical spray hole 7 gradually increases from top to bottom.

[0026] The water jet from the second conical nozzle 7 collides in the center of the pipe, which serves to dissipate energy. If the water jet from the second conical nozzle 7 hits the top of the next conical nozzle 5, it will cause vibration. The design needs to prevent the water jet from the previous conical nozzle 5 from hitting the top of the next conical nozzle 5.

[0027] Figure 1 The number of conical spray caps 5 in this example is one embodiment. During use, the number of conical spray caps 5 is adjusted according to the water head height. When the number of conical spray caps 5 increases, the pressure difference between the inlet and outlet of all conical spray holes decreases, the flow velocity decreases, the sound and vibration decrease, and the valve operation becomes more stable. The adverse consequence is a decrease in flow velocity. The number of conical spray caps 5 required can be adjusted according to the project requirements.

[0028] like Figure 1 As shown, the inspection cover 2 is plate-shaped and connected to the flange of the valve body 1 by bolts. Opening the inspection cover 2 allows for maintenance and cleaning. One end of the valve core seat 4 is connected to the valve core 10 via a flange, and the other end is connected to the pipeline via a flange. An internal protrusion 6 is provided, primarily for accommodating the conical spray caps 5. Adjustments to the number of conical spray caps 5 are made by disassembling and assembling the valve core seat 4.

[0029] Working Principle: High-pressure water flowing in from the inlet is sprayed into the valve core 10 through conical nozzle 9. Energy is dissipated through collisions within the valve core 10. The number of conical nozzles 5 affects the pressure difference between the inside and outside of the valve core 10, determining the spray speed and ultimately affecting sound and vibration. The position of the gate sleeve 3 determines the total opening area of ​​the conical nozzle 9, thus determining the valve opening degree. Water from the valve core 10 is sprayed into the conical nozzle 5 through conical nozzle 7, where it undergoes energy dissipation through collisions. The conical nozzles 5 increase flow resistance and dissipate energy. The more conical nozzles 5 there are, the better the noise and vibration reduction effect. However, using conical nozzles 5 will reduce the flow rate. The number of conical nozzles 5 can be determined according to the actual needs of the project. When adjusting the number of conical nozzles 5, first remove the valve core seat 4. The conical nozzles 5 inside the valve core 10 can be added or removed from the bottom of the valve core 10. Adding or removing conical nozzles 5 inside the valve core seat 4 is more convenient. After adjustment, reinstall the valve core seat 4.

[0030] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A multi-stage high head collision energy dissipation drain valve, which is composed of a valve body (1), an inspection cover plate (2), a gate sleeve (3), a valve core (10), a valve core seat (4), a conical injection cap (5), and a connecting rod (13), characterized in that, The left side of the valve body (1) is the water inlet, and the bottom of the valve core seat (4) is the water outlet. The number of the conical spray caps (5) is adjusted according to the water head height. The valve core (10) is provided with a conical spray hole one (9) on its side. The conical spray cap (5) is conical. The side is provided with a conical spray hole two (7). It is placed inside the valve core (10) and the valve core seat (4) by a protrusion (6). The conical spray hole one (9) is a cone with a large inlet and a small outlet. The conical spray hole one (9) is arranged in a spiral upward shape. The valve core (10) is provided with a protrusion (6). A sealing ring (8) is provided at the junction of the valve core (10) and the valve body (1). The conical spray hole two (7) is a cone with a large inlet and a small outlet. The diameter of the conical spray hole two (7) gradually increases from top to bottom.

2. A multi-stage high head opposing jet energy dissipating drain valve according to claim 1, wherein, One end of the connecting rod (13) is connected to the gate sleeve (3), and the other end is connected to the operating mechanism. The operating mechanism can be manual, electric, or hydraulic. A shaft seal (14) is provided between the connecting rod (13) and the valve body (1) to prevent high-pressure water leakage.

3. A multi-stage high head opposing jet energy dissipating drain valve according to claim 1 or 2, characterised in that, The gate sleeve (3) moves up and down under the control of the connecting rod (13). During the movement, the total area of ​​the sealing cone nozzle (9) changes. The total flow area of ​​the cone nozzle (9) determines the flow rate of the drain valve. N water-permeable holes (12) are provided on the top of the gate sleeve (3), and a sealing ring (11) is provided on the upper inner side of the gate sleeve (3).

4. A multi-stage high head opposing jet energy dissipating drain valve according to claim 1, wherein, The inspection cover (2) is plate-shaped and is connected to the flange of the valve body (1) by bolts.

5. A multi-stage high head opposing jet energy dissipating drain valve according to claim 1, wherein, The valve core seat (4) is connected to the valve core (10) at one end via a flange and to the pipeline at the other end via a flange, and has a protrusion (6) inside.

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