Large-caliber high-pressure shut-off valve

Abstract

The large-diameter high-pressure shut-off valve comprises a valve body, a valve seat, a valve plate, a valve rod and a driving mechanism, an angle of 90 degrees is formed between an inlet and an outlet of the valve body, and the valve rod is perpendicular to the inlet and coaxial with the center of the outlet. The sealing effect of the valve plate is achieved through medium positive pressure, and it is ensured that the valve can be effectively turned off in the high-pressure environment. The valve is further provided with a bypass pipeline and a bypass stop valve which are used for adjusting airflow in the opening or closing process of the valve, reducing the pressure difference and ensuring smooth opening or closing of the valve plate. The valve can adapt to a high-pressure gas pipeline with the gas storage pressure capable of reaching 20 MPa and the maximum drift diameter capable of reaching DN1800, and has good sealing performance, reliable turn-off performance and low maintenance cost. The valve can effectively avoid the problems of sealing failure and clamping stagnation of a traditional valve in a large-diameter and high-pressure environment.

Description

Technical Field

[0001] The present invention belongs to the field of valve technology, and in particular relates to a large-caliber high-pressure valve suitable for high-pressure pipelines in a compressed air energy storage (CAES) system. Background Art

[0002] With the rapid development of renewable energy, compressed air energy storage (CAES) has been increasingly widely used in large-scale power systems as an efficient energy storage method. Compressed air energy storage systems convert electrical energy into high-pressure gas for storage and release the gas to drive generator sets when needed, thereby achieving power balance and scheduling. Due to the high gas storage pressure (up to 20MPa) and the increase in air flow as the installed capacity increases, large-diameter pipes (maximum diameter up to 1.8 meters or more) are required to connect key equipment.

[0003] In high-pressure, ultra-large-flow compressed air pipelines, conventional stop valves, butterfly valves, ball valves and other equipment face many technical challenges. First, traditional valve designs often cannot meet the strict sealing requirements of large-caliber, high-pressure systems, and are prone to leakage under high pressure. Secondly, the operation of conventional valves when opening or closing may cause the valve plate to become stuck, affecting its reliability and response speed. Finally, due to the large size of the valve and the need to withstand a high gas flow rate, conventional designs cannot effectively achieve a stable and reliable shut-off effect, especially in high pressure differential and large flow environments, which can easily lead to valve failure.

[0004] As the valve diameter increases, the force acting on the valve plate when the valve is closed will also be extremely huge. For example, taking the medium pressure of 20MPa and the valve diameter of DN1800 as an example, the thrust of the internal pressure on the valve plate can reach more than 5,000 tons. This not only requires a high thrust or torque when the valve is actuated, but also the sealing effect of the valve plate under the huge pressure difference on both sides when the valve is closed is also a great technical challenge. Therefore, for the application of valves in large-diameter and high-pressure pipelines in compressed air energy storage systems, it is urgent to develop a new type of large-diameter high-pressure valve to achieve reliable sealing and stable shut-off functions, and to adapt to the needs of high-pressure and ultra-large flow fluid control. Summary of the invention

[0005] In order to achieve effective control of large-diameter high-pressure pipelines in the field of compressed air energy storage, the present invention provides a new large-diameter high-pressure valve. The valve is designed to solve the sealing and shutoff performance problems of existing valves under high pressure and large flow environments, and is particularly suitable for shutoff and flow control of high-pressure gas pipelines.

[0006] In order to achieve the above-mentioned invention object, the present invention adopts the following technical solutions:

[0007] A large-caliber high-pressure shut-off valve comprises a valve body, a valve plate, a valve stem, a valve seat, a bypass pipe and a drive device, wherein the inlet and outlet of the valve body are at an angle of 90 degrees, the valve plate is connected to the drive device through the valve stem, the valve seat is arranged inside the valve body and closely matches the valve plate, the valve plate structure adopts a circular convex lens type with a thick middle and thin edges, and the side of the valve seat in contact with the valve plate adopts an arc with the same arc as that of the valve plate; the valve stem is perpendicular to the inlet of the valve body and coaxial with the central axis of the valve body outlet; the bypass pipe is connected across the valve body and the valve body outlet, and when the valve is opened, the bypass pipe is opened first to reduce the pressure difference between the inlet and outlet of the valve; when the valve is closed, the bypass pipe is also opened first to avoid the valve plate being blocked from closing due to excessive internal pressure when the valve is closed.

[0008] Furthermore, the present invention also includes an inner tube, an outer tube, a support spring, a closing positioning pin and an opening positioning pin. The support spring is arranged on the valve stem, and one end of the support spring is connected to the valve body, and the other end cooperates with the closing positioning pin and the opening positioning pin for positioning.

[0009] Furthermore, the closing positioning pin and the opening positioning pin are arranged through the inner tube and the outer tube.

[0010] Furthermore, the valve stem passes through the valve body and is sealed with the valve body through a sealing plug and an O-ring.

[0011] Furthermore, the valve body is made of a high-strength, corrosion-resistant metal material.

[0012] 2) Valve opening status:

[0013] Valve plate position and airflow: When the valve is open, the valve plate is close to the top of the valve body. The medium (gas) enters through the valve inlet, turns 90 degrees and flows out through the outlet. At this time, the valve is in a fully open state and the gas can flow smoothly.

[0014] Bypass stop valve: When the valve is open, the bypass stop valve is closed, ensuring that all gas flows through the main valve channel without leakage or bypass flow.

[0015] Fluid Passage: This open position of the valve ensures that fluid can pass smoothly through the high-pressure gas pipeline system without any flow restriction.

[0016] 3) Valve closed state:

[0017] Valve plate position and airflow: When the valve is closed, the valve plate is close to the bottom of the valve body. The medium (gas) enters through the valve inlet, but the valve outlet is blocked by the valve plate and cannot flow out. At this time, the valve is in a completely closed state, the valve body is subjected to the internal static pressure of the medium, and the valve plate is tightly pressed against the valve seat by the internal static pressure, achieving a continuous sealing effect.

[0018] Bypass stop valve: When the valve is closed, the bypass stop valve is also closed, ensuring that all gas cannot flow through the main valve channel and the bypass channel, achieving a shut-off effect.

[0019] Fluid passage: This closed state of the valve ensures that the fluid is cut off at the valve and cannot enter the downstream pipeline and equipment.

[0020] 4) State control

[0021] The valve status control is achieved by controlling the valve stem to rise and fall by external force. The external force includes a manual or actuator (electric, pneumatic or hydraulic) installed on the top of the valve and a sensor system that cooperates with it. The valve's opening and closing action, closing torque and sealing effect can be remotely monitored and operated by manually controlling the valve stem or a control system.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) Improve sealing and shut-off performance: The valve plate is tightly pressed against the outlet pipe by the positive pressure of the medium, ensuring the sealing and shut-off effect of the valve. It can withstand high-pressure gas flow and avoid the problem that conventional valves cannot achieve reliable shut-off.

[0024] 2) Adapt to large-diameter, high-pressure systems: The valve design takes into account large-diameter pipelines and high-pressure environments, and adopts a reasonable structural layout. It can work stably in large-flow, high-pressure gas pipeline systems and is suitable for high-pressure gas storage and transportation fields such as compressed air energy storage.

[0025] 3) Simplified operation and maintenance: The valve has a simple structure and is easy to operate and maintain. Especially in high-pressure environments, its stability and reliability are more advantageous than traditional valves, reducing the frequency of shutdown inspections and maintenance and lowering operating costs.

[0026] 4) Enhanced flow control capability: Through the precisely designed valve plate and valve seat matching structure, good control performance is provided during the fluid flow process, ensuring that the valve can accurately adjust the flow under different working conditions.

[0027] The valve technology of the present invention is applicable to multiple fields such as compressed air energy storage, natural gas transmission, high-pressure industrial gas pipelines, etc., and has broad application prospects and market value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of the structural schematic diagram of the present invention (valve open state);

[0029] Figure 2 It is a front view of the structural schematic diagram of the present invention (valve closed state);

[0030] Figure 3It is a left view of the structural schematic diagram of the present invention;

[0031] Figure 4 It is a right view of the structural schematic diagram of the present invention;

[0032] Among them, 1. valve inlet; 2. valve outlet; 3. bypass pipe; 4. bypass stop valve; 5. valve body; 6. outer tube; 7. inner tube; 8. valve plate; 9. support spring; 10. valve stem; 11. closing positioning pin; 12. opening positioning pin; 13. valve seat; 14. sealing plug; 15. O-ring. DETAILED DESCRIPTION

[0033] like Figure 1-Figure 4 As shown, the specific implementation of the present invention is as follows:

[0034] Valve body structure: Valve body 5 is made of high-strength, corrosion-resistant metal material, which can withstand the action of high-pressure gas. The inlet and outlet of the valve body are at a 90-degree angle, which is convenient for the direction of gas flow. The size of the valve body design is suitable for large-diameter, high-pressure pipelines, with a maximum diameter of DN1800, which meets the large-flow gas control needs in compressed air energy storage systems.

[0035] Valve plate and valve seat: The valve plate 8 is connected to the driving device through the valve stem 10, and the valve seat 13 is arranged inside the valve body 5 and closely matches the valve plate 8. The structure of the valve plate 8 adopts a circular convex lens type with a thick middle and thin edges, and the side of the valve seat 13 in contact with the valve plate 8 adopts an arc shape with the same arc as the valve plate. Under high pressure, the valve plate will produce a slight deformation outward due to the internal pressure, and the raised contact surface can ensure that the valve plate and the valve seat always have a tight contact surface, ensuring the sealing effect of the valve.

[0036] Valve stem and drive mechanism: The valve stem 10 is perpendicular to the valve inlet and coaxial with the center axis of the outlet. Under the action of external force, the valve stem 10 drives the valve plate 8 to move inside the valve, thereby opening or closing the valve. The external force includes manpower or a drive device, and the power of the drive device can be electric, hydraulic or compressed air.

[0037] Bypass pipeline and bypass stop valve: The bypass pipeline 3 is made of a steel pipe not larger than DN50, which is connected across the valve body and the valve outlet. The bypass stop valve 4 is a manual stop valve. The main function of the bypass is to open the bypass pipeline 3 first when the valve is opened, reduce the pressure difference between the valve inlet and outlet, and facilitate the smooth opening of the valve plate 8; when the valve is closed, the bypass pipeline 3 is also opened first to avoid the valve plate 8 being blocked from closing due to excessive internal pressure when the valve is closed. After the valve is opened or closed, close the bypass stop valve 4.

[0038] The present invention further comprises an inner tube 7, an outer tube 6, a support spring 9, a closing positioning pin 11 and an opening positioning pin 12. The support spring 9 is arranged on the valve stem 10, and one end of the support spring 9 is connected to the valve body 5, and the other end cooperates with the closing positioning pin 11 and the opening positioning pin 12 for positioning. The closing positioning pin and the opening positioning pin are arranged through the inner tube 7 and the outer tube 6. The valve stem 10 passes through the valve body 5 and is sealed and matched with the valve body 5 through the sealing plug 14 and the O-ring 15.

[0039] Valve opening process:

[0040] Open the bypass stop valve: Before the valve is opened, the bypass stop valve must be opened first. The function of the bypass stop valve is to reduce the pressure difference between the inlet and outlet of the valve, so that the valve plate can be opened smoothly.

[0041] External force drive: The valve is opened by an external force driving the valve stem to move the valve plate (such as manual, electric, pneumatic or hydraulic drive). When the valve opening command is received, the external force or drive mechanism drives the valve plate to move through the valve stem. The force of the external force or drive mechanism pushes the valve plate away from the valve seat and opens the air flow channel.

[0042] The valve plate gradually moves to the open position: Under the action of the drive mechanism, the valve plate gradually moves away from the valve seat, and the air flow begins to flow out through the valve outlet. The gap between the valve plate and the valve seat gradually increases, and the resistance to the flow of gas through the valve gradually decreases.

[0043] The valve disc is completely away from the valve seat: As the drive mechanism continues to work, the valve disc is completely away from the valve seat and the valve is fully open. At this time, the gas can flow freely through the valve, the valve is in a fully open state, and the fluid channel is completely unobstructed.

[0044] Airflow through the valve: When the valve is fully open, the medium flows in from the inlet, turns 90 degrees and flows out through the outlet. The valve is at its maximum opening, the gas flows smoothly, and the pressure loss is minimal. In this state, the valve provides a reliable channel for large-flow, high-pressure gas pipelines.

[0045] Bypass stop valve closed: After the valve is fully opened, the bypass stop valve is closed and all air flows through the main valve. At this time, the valve operates stably under large flow and high pressure, meeting the air flow control requirements of the compressed air energy storage system.

[0046] Valve closing process:

[0047] Open the bypass stop valve: When the main valve needs to be closed, first open the bypass stop valve to ensure that the gas can continue to flow through the bypass to prevent overpressure in the pipeline due to closing the main valve.

[0048] The valve plate approaches the outlet: The drive device pushes the valve plate toward the valve outlet through the valve stem, and the valve plate gradually approaches the valve seat. Due to the design of the bypass pipeline, the valve closing process can be carried out smoothly without causing severe impact on the airflow.

[0049] The valve plate is in close contact with the valve seat: When the valve plate is completely close to the outlet, the valve plate and the valve seat are in close contact, the valve is closed, and the gas flow is completely blocked. The valve is in a completely closed state at this time, and the gas cannot flow out through the valve.

[0050] Positive pressure of the medium: After the valve plate and the valve seat are sealed, the positive pressure of the medium begins to work, further pressing the valve plate to ensure the sealing performance. At this time, the valve can withstand the effect of high-pressure gas and prevent any leakage.

[0051] Close the bypass stop valve: After the main valve is completely closed, the bypass stop valve is closed. At this time, the valve is in a stable closed state, the gas is completely isolated, and the system is in a shut-off state.

[0052] Methods of using the present invention

[0053] 1) Valve installation and debugging: First, install the valve at the pipeline connection of the compressed air energy storage system to ensure that the inlet and outlet of the valve are firmly connected to the pipeline system. During debugging, control the opening and closing state of the valve through external force or drive device to ensure that the valve can be opened and closed smoothly under normal working pressure.

[0054] 2) Valve opening: First open the bypass stop valve to ensure that the airflow flows through the bypass. Then, push the valve plate through the drive device to gradually move it away from the valve seat to open the airflow channel. When the valve plate is fully opened, the gas flows smoothly through the valve, the valve is in a fully open state, and the bypass stop valve is closed.

[0055] 3) Valve closing: First open the bypass stop valve, then use external force or drive mechanism to push the valve plate toward the valve seat until the valve plate is completely close to the valve seat, closing the air flow channel. At this time, the positive pressure of the medium ensures the valve seal and achieves the shut-off effect. The valve is in a fully closed state, and the bypass stop valve is closed.

Claims

1. A large-caliber high-pressure shut-off valve, characterized in that: It includes a valve body, a valve plate, a valve stem, a valve seat, a bypass pipe and a driving device. The inlet and outlet of the valve body are at an angle of 90 degrees. The valve plate is connected to the driving device through the valve stem. The valve seat is arranged inside the valve body and closely matches the valve plate. The valve plate structure adopts a circular convex lens type with a thick middle and thin edges. The side of the valve seat in contact with the valve plate adopts an arc with the same arc as that of the valve plate; the valve stem is perpendicular to the inlet of the valve body and coaxial with the central axis of the valve body outlet; the bypass pipe is connected across the valve body and the valve body outlet. When the valve is opened, the bypass pipe is opened first to reduce the pressure difference between the inlet and outlet of the valve; when the valve is closed, the bypass pipe is also opened first to avoid the valve plate being blocked from closing due to excessive internal pressure when the valve is closed.

2. A large-caliber high-pressure shut-off valve according to claim 1, characterized in that: It also includes an inner tube, an outer tube, a support spring, a closing positioning pin and an opening positioning pin. The support spring is arranged on the valve stem, and one end of the support spring is connected to the valve body, and the other end cooperates with the closing positioning pin and the opening positioning pin for positioning.

3. A large-caliber high-pressure shut-off valve according to claim 2, characterized in that: The closing positioning pin and the opening positioning pin are arranged through the inner cylinder and the outer cylinder.

4. A large-caliber high-pressure shut-off valve according to claim 1, characterized in that: The valve stem passes through the valve body and is sealed with the valve body through a sealing plug and an O-ring.

5. A large-caliber high-pressure shut-off valve according to claim 1, characterized in that: The valve body is made of high-strength, corrosion-resistant metal material.

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