Sealing structure applied to water inlet ball valve of pumped storage power station

Abstract

The utility model provides a sealing structure applied to a water inlet ball valve of a pumped storage power station, which relates to the field of water inlet ball valves, and comprises a valve body, two ends of the valve body are provided with interfaces, the two interfaces are provided with guide rings, two sides of the two guide rings are provided with upstream and downstream connecting pipes, the valve body is internally provided with a regulating valve, and the regulating valve is connected with the upstream and downstream connecting pipes. A valve water sealing ring is mounted and connected on the adjusting valve; and the efficient sealing mechanism comprises an adjusting cavity, and the adjusting cavity is arranged between the valve body and the guide ring. Through a precise sealing system formed by the sealing ring, the valve water sealing ring, the D-shaped sealing ring and special treatment of all contact surfaces, high-pressure hydraulic oil is introduced into the first through pipe or the second through pipe alternately, the sealing ring can be pushed to move alternately in the adjusting cavity and make close contact with the valve water sealing ring, and an unbreakable sealing barrier is constructed; therefore, the water pump can adapt to complex and frequently-changing water pressure working conditions of the pumped storage power station.

Description

Technical Field

[0001] This utility model relates to the field of inlet ball valves, and in particular to a sealing structure for inlet ball valves used in pumped storage power stations. Background Technology

[0002] In today's energy landscape, pumped storage power stations, as a crucial energy storage facility, play an indispensable role in balancing grid load, improving power system stability, and promoting the consumption of clean energy. The inlet ball valve, as a key control component in the water conveyance system of a pumped storage power station, directly determines the station's operating efficiency, safety, and equipment lifespan through its sealing performance.

[0003] With the continuous development of pumped storage technology, increasingly higher requirements are being placed on the sealing structure of inlet ball valves. Traditional inlet ball valve sealing structures used in this field are gradually revealing numerous drawbacks. On the one hand, the sealing reliability is insufficient to meet the demands of complex operating conditions. During the operation of pumped storage power stations, water pressure conditions are complex and variable. High head pressure is encountered during the pumping phase, while the water pressure changes drastically during the power generation and release phase. Traditional sealing methods are unable to adapt to such frequent and significant pressure fluctuations, often resulting in incomplete sealing. For example, under high head conditions, the high-pressure water flow exerts a huge impact force on the ball valve sealing area, causing tiny gaps at the seal and leading to serious leakage.

[0004] On the other hand, traditional sealing structures suffer from poor durability in the face of frequent opening and closing operations. Pumped storage power stations require frequent opening and closing of inlet ball valves to meet grid peak-shaving demands, sometimes even multiple times within a short period. During this process, the moving parts related to the seals are subjected to high-intensity friction, impact, and mechanical wear, leading to rapid wear and significantly shortened lifespan. Frequent replacement of sealing parts not only consumes substantial manpower, material resources, and financial resources, increasing equipment maintenance costs, but also causes frequent shutdowns for maintenance, severely disrupting the power station's power generation scheduling plan, reducing the timeliness and effectiveness of grid peak-shaving, and causing significant inconvenience to power supply. Furthermore, since pumped storage power stations primarily draw water from natural reservoirs, the water inevitably contains various impurities such as silt, algae, etc. These impurities, after entering the ball valve with the water flow, easily adhere to critical parts such as the sealing surface, further aggravating the wear of the seals. They may also jam moving parts, hindering the normal opening and closing of the ball valve, seriously threatening the reliability and stability of the sealing structure, and posing a significant hidden danger to the safe and stable operation of the power station.

[0005] Therefore, it is necessary to provide a new sealing structure for the inlet ball valve of a pumped storage power station to solve the above-mentioned technical problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a sealing structure for the inlet ball valve of a pumped storage power station.

[0007] This utility model provides a sealing structure for an inlet ball valve of a pumped storage power station, comprising: a valve body, with interfaces at both ends of the valve body, guide rings at both interfaces, and upstream and downstream connecting pipes installed on both sides of the guide rings; an adjusting valve inside the valve body, with a valve sealing ring installed on the adjusting valve; and a high-efficiency sealing mechanism, including an adjusting cavity located between the valve body and the guide rings, a sealing ring inside the adjusting cavity, a first through pipe inside the guide rings, and a second through pipe on the shell wall of the valve body.

[0008] Preferably, one end of the first tube extends into the interior of the adjustment cavity, and one end of the second tube extends into the interior of the adjustment cavity.

[0009] Preferably, the contact surface between the guide ring and the sealing ring is coated with a corrosion-resistant stainless steel layer using a welding process.

[0010] Preferably, the contact surface between the valve body and the sealing ring is made of corrosion-resistant stainless steel through welding.

[0011] Preferably, the sealing ring has a D-shaped sealing ring on its ring wall.

[0012] Preferably, a guide ring is provided on the ring wall of the sealing ring, the guide ring is located on one side of the D-shaped sealing ring, and the guide ring is made of polytetrafluoroethylene.

[0013] Preferably, a right-angle joint sealing ring is installed at the joint between the guide ring and the valve body.

[0014] Compared with related technologies, the sealing structure for the inlet ball valve of a pumped storage power station provided by this utility model has the following advantages:

[0015] 1. This utility model utilizes a precision sealing system comprised of a sealing ring, a valve water-sealing ring, a D-type sealing ring, and specially treated contact surfaces. The alternating introduction of high-pressure hydraulic oil through the first or second pipe drives the sealing ring to move alternately within the regulating chamber, ensuring tight contact with the valve water-sealing ring and creating an indestructible sealing barrier. This prevents water leakage and allows the system to adapt to the complex and frequently changing water pressure conditions of pumped storage power stations. Whether it's the high-pressure impact during high-head energy storage or the water flow regulation during power generation, the risk of leakage can be controlled to an extremely low level, avoiding water waste, ensuring stable and efficient turbine water intake, improving power generation conversion efficiency, and creating greater economic benefits for the power station.

[0016] 2. This utility model, by setting guide rings and D-type sealing rings on the sealing ring, utilizes the self-lubricating, corrosion-resistant, and sediment-proof properties of the guide ring to comprehensively protect moving parts, reduce friction wear and jamming risks, and extend the service life of the sealing structure and the ball valve as a whole. Furthermore, the corrosion-resistant strengthening treatment of key parts such as the contact surface between the valve body and the sealing ring, and the contact surface between the guide ring and the sealing ring, improves the durability of the equipment in complex water environments containing impurities, reduces the frequency and cost of equipment maintenance, ensures the continuous and stable operation of the power plant, and reduces power generation interruptions caused by equipment maintenance. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of this utility model;

[0018] Figure 2 for Figure 1 The diagram shows the structure at point A.

[0019] Figure 3 for Figure 2 The diagram shows the structure at point B.

[0020] The following are the labels in the diagram: 1. Valve body; 2. Guide ring; 3. Upstream and downstream connecting pipes; 4. Adjusting valve; 41. Valve sealing ring; 5. Adjusting chamber; 51. Sealing ring; 52. First connecting pipe; 53. Second connecting pipe; 6. D-type sealing ring; 7. Guide ring; 8. Sealing ring at right angle connection. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please refer to the following: Figures 1 to 3 A sealing structure for an inlet ball valve of a pumped storage power station includes: a valve body 1, with interfaces at both ends of the valve body 1, guide rings 2 at both interfaces, and upstream and downstream connecting pipes 3 installed on both sides of the guide rings 2; an adjusting valve 4 inside the valve body 1, with a valve sealing ring 41 installed on the adjusting valve 4; and a high-efficiency sealing mechanism, including an adjusting cavity 5, located between the valve body 1 and the guide rings 2, with a sealing ring 51 inside the adjusting cavity 5, a first through pipe 52 inside the guide rings 2, and a second through pipe 53 on the shell wall of the valve body 1.

[0023] In the specific implementation process, such as Figure 1 and Figure 2 As shown, one end of the first conduit 52 extends into the interior of the adjustment cavity 5, and one end of the second conduit 53 extends into the interior of the adjustment cavity 5.

[0024] It should be noted that the sealing ring 51 is made of forged high-performance stainless steel and manufactured through a fine machining process. As a moving part, it moves flexibly and precisely within the valve body 1. Its fit with the valve body 1, valve sealing ring 41, and other components is extremely precise, forming a reliable first line of defense for sealing. It can effectively prevent water leakage under various water pressure conditions, ensuring the sealing performance of the ball valve.

[0025] The valve sealing ring 41 fits tightly against the regulating valve 4, forming a tight fit with the sealing ring 51 to complete the crucial sealing action. When the ball valve is closed, the regulating valve 4 drives the valve sealing ring 41 to rotate to a predetermined position. Then, the first through pipe 52 in the guide ring 2 introduces high-pressure hydraulic oil to push the sealing ring 51 to the right, making it in close contact with the valve sealing ring 41, thus constructing an indestructible sealing barrier and preventing water leakage.

[0026] refer to Figure 2 As shown, the contact surface between the guide ring 2 and the sealing ring 51 is covered with a corrosion-resistant stainless steel layer using a welding process.

[0027] It should be noted that the guide ring 2 is made of high-quality alloy casting and is firmly installed in a key part inside the valve body 1. The contact surface with the sealing ring 51 is coated with a corrosion-resistant stainless steel layer using an advanced welding process. On the one hand, this effectively resists the erosion of the key contact surface of the sealing structure by corrosive components in the water, ensuring long-term operational stability. On the other hand, the first through pipe 52 installed on it serves as the inlet and outlet of high-pressure hydraulic oil, providing a reliable power source for the precise drive of the sealing ring 51, meeting the requirements of rapid and precise opening and closing control of the ball valve.

[0028] refer to Figure 1 and Figure 2 As shown, the contact surface between the valve body 1 and the sealing ring 51 is made of corrosion-resistant stainless steel through welding.

[0029] It should be noted that the contact surface between the valve body 1 and the sealing ring 51 is overlaid with corrosion-resistant stainless steel, which can enhance the corrosion resistance of key parts, ensure the integrity of the valve body 1 structure in complex water environments, and provide a stable support environment for the sealing structure.

[0030] refer to Figure 2 and Figure 3 As shown, a D-shaped sealing ring 6 is provided on the ring wall of the sealing ring 51.

[0031] It should be noted that the D-type sealing ring 6 is installed in a specific key position, which plays a unique anti-overturning sealing function, strictly preventing water leakage between the piston chambers on both sides of the regulating chamber 5, ensuring stable pressure in different chambers inside the ball valve, avoiding sealing failure caused by pressure imbalance, and further consolidating the overall sealing effect.

[0032] refer to Figure 3As shown, a guide ring 7 is provided on the ring wall of the sealing ring 51. The guide ring 7 is located on one side of the D-type sealing ring 6 and is made of polytetrafluoroethylene.

[0033] It should be noted that the guide ring 7 is made of polytetrafluoroethylene (PTFE), which, with its excellent self-lubricating properties, extremely low coefficient of friction, and superior chemical corrosion resistance, provides high-precision support and guidance for moving parts such as the sealing ring 51, ensuring the smooth and stable operation of the moving parts.

[0034] At the same time, thanks to its excellent anti-sand properties, it effectively prevents impurities such as mud, algae and other impurities in the water from entering the sealed core area, preventing parts from jamming and excessive wear.

[0035] refer to Figure 1 and Figure 2 As shown, a right-angle connection sealing ring 8 is installed at the joint between the guide ring 2 and the valve body 1.

[0036] It should be noted that the sealing ring 8 at the right-angle connection can ensure a better sealing effect at the joint between the guide ring 2 and the valve body 1.

[0037] The working principle of the sealing structure of the inlet ball valve of the pumped storage power station provided by this utility model is as follows: When it is necessary to close the inlet ball valve, the operator precisely rotates the adjusting valve 4 through an external electric or hydraulic actuator (existing technology). The adjusting valve 4 drives the valve sealing ring 41 to rotate to the preset precise position. At this time, high-pressure hydraulic oil is smoothly injected from the inlet and outlet of the guide ring 2 into one side cavity of the adjusting chamber 5, pushing the sealing ring 51 to move smoothly to the right, so that it fits tightly with the valve sealing ring 41, forming a high-strength sealing barrier, completely blocking the water flow channel, and realizing the reliable closure of the ball valve.

[0038] When the inlet ball valve is opened, high-pressure hydraulic oil quickly enters from the second through pipe 53 of the valve body 1, pushing the sealing ring 51 to the left, causing it to disengage from the valve sealing ring 41. Then, the operator uses the external actuator to rotate the adjusting valve 4 and the valve sealing ring 41 precisely by 90°, fully opening the ball valve and allowing water to flow through unimpeded.

[0039] 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 content of this utility model specification and drawings, 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 sealing structure applied to a water intake ball valve of a pumped storage power station, characterized in that, Include: Valve body (1), both ends of the valve body (1) are provided with interfaces, both of which are provided with guide ring (2), both sides of the two guide ring (2) are installed and connected with upstream and downstream connecting pipe (3), the inside of the valve body (1) is provided with adjusting valve (4), the adjusting valve (4) is installed and connected with valve sealing ring (41); High efficiency sealing mechanism, the high efficiency sealing mechanism includes adjusting cavity (5), the adjusting cavity (5) is arranged between the valve body (1) and the guide ring (2), the inside of the adjusting cavity (5) is provided with sealing ring (51), the inside of the guide ring (2) is provided with first through pipe (52), the shell wall of the valve body (1) is provided with second through pipe (53).

2. The sealing structure applied to the water intake ball valve of the pumped storage power station according to claim 1, characterized in that, One end of the first through pipe (52) extends to the inside of the adjusting cavity (5), one end of the second through pipe (53) extends to the inside of the adjusting cavity (5).

3. The sealing structure applied to the water intake ball valve of the pumped storage power station according to claim 1, characterized in that, The contact surface of the guide ring (2) and the sealing ring (51) is provided with a layer of corrosion-resistant stainless steel by surfacing process.

4. The sealing structure applied to the water intake ball valve of the pumped storage power station according to claim 1, characterized in that, The contact surface of the valve body (1) and the sealing ring (51) is provided with corrosion-resistant stainless steel by surfacing.

5. The sealing structure applied to the water intake ball valve of the pumped storage power station according to claim 1, characterized in that, The ring wall of the sealing ring (51) is provided with D type sealing ring (6).

6. The sealing structure applied to the water intake ball valve of a pumped storage power station according to claim 5, characterized in that, The ring wall of the sealing ring (51) is provided with guide ring (7), the guide ring (7) is arranged on one side of the D type sealing ring (6), and the guide ring (7) is made of polytetrafluoroethylene.

7. The sealing structure applied to the water intake ball valve of the pumped storage power station according to claim 1, characterized in that, The joint between the guide ring (2) and the valve body (1) is installed and connected with right angle connecting sealing ring (8).

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