High-temperature lead-bismuth liquid alloy flow regulating valve

Abstract

The utility model relates to the technical field of flow regulating valves, and discloses a high-temperature lead-bismuth liquid alloy flow regulating valve. A buffer device is arranged on a valve body of the flow regulating valve; the two ends of the buffering device are detachably connected to the input end and the output end of the valve body correspondingly so that the positive and negative water hammer effect occurring when the flow adjusting valve is closed and opened can be relieved. According to the flow regulating valve, the buffer device is arranged on the valve body of the flow regulating valve, the two ends of the buffer device are detachably connected to the input end and the output end of the valve body correspondingly, so that the positive and negative water hammer effect occurring when the flow regulating valve is closed and opened is relieved, and the problem of pipeline maintenance caused by pipeline vibration caused by the water hammer effect is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of flow regulating valves, in particular to a high-temperature lead-bismuth liquid alloy flow regulating valve. Background Technique

[0002] Liquid lead-bismuth alloy is widely used as a cooling medium in the fourth-generation nuclear reactor due to its high thermal conductivity, low melting point and excellent nuclear properties. However, under high-temperature (≥500 °C) working conditions, when the valve of the traditional flow regulating valve is quickly opened and closed, the sudden change of pipeline pressure causes positive and negative water hammer effects, resulting in fatigue and even rupture of the valve and pipeline structure. In the prior art, the valve mostly adopts a rigid buffer structure or a single-direction damping design, which cannot absorb the bidirectional water hammer energy synchronously. Summary of the Invention

[0003] This application aims to provide a high-temperature lead-bismuth liquid alloy flow regulating valve, which relieves the positive and negative water hammer effects through a bidirectional buffer device. The specific solution is as follows:

[0004] A high-temperature lead-bismuth liquid alloy flow regulating valve, including a flow regulating valve, and a buffer device is arranged on the valve body of the flow regulating valve;

[0005] Both ends of the buffer device are detachably connected to the input end and the output end of the valve body respectively, so as to relieve the positive and negative water hammer effects that occur when the flow regulating valve is closed and opened.

[0006] Preferably, the buffer device includes: a pipe body and deformation parts arranged at both ends of the pipe body;

[0007] The pipe body includes an inner pipe and an outer pipe nested at intervals from the inside to the outside;

[0008] Axially, a first flow port and a second flow port are respectively opened on the pipe wall of the inner pipe, a piston is arranged inside the inner pipe, and a buffer medium is filled in the cavity of the inner pipe and the cavity formed by the interval between the inner pipe and the outer pipe;

[0009] The end of the cavity between the inner pipe and the outer pipe is a closed end;

[0010] The piston is hermetically connected to the inner pipe and slides along the length direction of the inner pipe;

[0011] The deformation parts are respectively detachably connected to the inner wall of the end of the inner pipe;

[0012] The first flow port and the second flow port are respectively located on both sides of the piston, and the first flow port and the second flow port are respectively communicated with the cavity of the inner pipe and the cavity between the inner pipe and the outer pipe.

[0013] Preferably, the flow regulating valve, the deformable member, the inner tube, the outer tube, and the piston are all high temperature resistant parts.

[0014] Preferably, the inner tube, the outer tube and the valve body are components made of the same material.

[0015] Preferably, a high temperature resistant support member is provided on one side of the deformable member facing away from the piston;

[0016] The high temperature resistant support member is installed at the end of the inner tube to prevent the deformable member from being drastically deformed toward one side of the valve body. The high temperature resistant support member is evenly provided with flow holes.

[0017] Preferably, the high temperature resistant support member is detachably connected to the inner tube.

[0018] Compared with the prior art, the beneficial effects of this application are:

[0019] The present application provides a buffer device on the valve body, and the two ends of the buffer device are detachably connected to the input end and the output end of the valve body of the flow regulating valve. The bidirectional sliding of the piston in the buffer device and the flow of the buffer medium synchronously absorb the positive and negative water hammer energy to alleviate the positive and negative water hammer effects that occur when the flow regulating valve is closed and opened, and reduce the problem of pipeline maintenance caused by pipeline vibration due to the water hammer effect.

[0020] The high temperature resistant support is connected to the end of the inner tube by threading, limiting the deformation of the deformation piece to the side facing away from the piston. The high temperature resistant support has evenly distributed flow holes, which allow the air pressure in the valve body to pass through and act on the deformation piece.

[0021] This application solves the water hammer effect of traditional high-temperature liquid metal valves under extreme working conditions through an innovative two-way buffer mechanism and all-high-temperature materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a high-temperature lead-bismuth liquid alloy flow control valve in an embodiment of the present application;

[0023] Figure 2 This is a cross-sectional schematic diagram of a buffer device in a high-temperature lead-bismuth liquid alloy flow control valve in an embodiment of the present application;

[0024] Figure 3 It is a schematic diagram of a buffer device when a positive water hammer effect occurs in a high-temperature lead-bismuth liquid alloy flow control valve in an embodiment of the present application;

[0025] Figure 4 It is a schematic diagram of a buffer device when a negative water hammer effect occurs in a high-temperature lead-bismuth liquid alloy flow control valve in an embodiment of the present application;

[0026] In the figure: 1, valve body; 2, valve stem; 3, valve core; 4, actuator; 5, valve seat; 6, buffer device; 7, valve cover; 8, high-temperature support; 9, deformation member; 61, inner tube; 62, outer tube; 63, first flow port; 64, input end buffer chamber; 65, piston; 66, second flow port; 67, output end buffer chamber. Specific implementation manner

[0027] A high-temperature lead-bismuth liquid alloy flow regulating valve, including a flow regulating valve, wherein a buffer device 6 is provided on the valve body of the flow regulating valve;

[0028] Both ends of the buffer device 6 are detachably connected to the input end and the output end of the valve body 1 respectively to relieve the positive and negative water hammer effects that occur when the flow regulating valve is closed and opened.

[0029] It should be noted that:

[0030] In this application, the buffer device 6 is detachably connected to the input end and the output end of the valve body 1 respectively through flange bolts.

[0031] Further, the buffer device 6 includes: a pipe body and deformation members 9 provided at both ends of the pipe body;

[0032] The pipe body includes an inner tube 61 and an outer tube 62 that are coaxially and spaced apart from each other from the inside to the outside; the inner tube 61 is axially provided with a first flow port 63 and a second flow port 66 respectively, a piston 65 is arranged inside the inner tube 61, and a buffer medium is filled in the cavity of the inner tube 61 and the cavity between the inner tube 61 and the outer tube 62;

[0033] The piston 65 slides along the length direction of the inner tube 61, and the piston 65 is hermetically connected to the inner tube 61;

[0034] The deformation members 9 are detachably connected to the two ends of the inner tube 61 and the outer tube 62 respectively.

[0035] It should be noted that:

[0036] In this application, the buffer medium is a silicon-based liquid metal buffer medium;

[0037] In this application, the inner tube 61 and the outer tube 62 are coaxially nested, with the outer tube 62 sleeved outside the inner tube 61, and an annular cavity is formed between them at an interval; the ends of the cavities between the inner tube 61 and the outer tube 62 (i.e., between their ends) are sealed and connected by welding or sealant to ensure that the buffer medium does not leak, enabling the piston 65 to slide stably in the tube body, effectively transmitting pressure, and achieving the mitigation of positive and negative water hammer effects. The first flow port 63 and the second flow port 66 are respectively located on both sides of the input end and the output end of the piston 65 facing the valve body 1; the first flow port 63 and the second flow port 66 are respectively communicated with the cavity of the inner tube 61 and the cavity between the inner tube 61 and the outer tube 62, so as to realize that when the flow regulating valve is closed and a positive water hammer effect is generated, the increased air pressure at the input end of the valve body 1 causes the deformation member 9 at the corresponding port to deform towards the piston side, thereby pushing the piston 65 to move towards the output end side of the valve body 1, and the buffer medium located on the side of the piston 65 close to the output end of the valve body 1 correspondingly flows through the second flow port 66 close to the output end of the valve body 1 into the cavity between the inner tube 61 and the outer tube 62 to mitigate the generated positive water hammer effect; when the flow regulating valve is opened and a negative water hammer effect is generated, the increased air pressure at the output end of the valve body 1 causes the deformation member 9 at the corresponding port to deform towards the piston 65 side, thereby pushing the piston 65 to move towards the input end side of the valve body 1, and the buffer medium located on the side of the piston 65 close to the input end of the valve body 1 correspondingly flows through the first flow port 63 close to the output end of the valve body 1 into the cavity between the inner tube 61 and the outer tube 62 to mitigate the generated negative water hammer effect.

[0038] Further, the flow regulating valve, the deformation member 9, the inner tube, the outer tube, and the piston 65 are all high-temperature resistant components.

[0039] Further, the inner tube and the outer tube are made of the same material as the valve body.

[0040] Further, high-temperature resistant support members 8 are respectively arranged on the side of the deformation member 9 facing the valve body;

[0041] The high-temperature resistant support members 8 are installed at the ends of the tube body to prevent the deformation member 9 from deforming violently towards the valve body side, and the high-temperature resistant support members are uniformly provided with flow holes.

[0042] It should be noted that:

[0043] In this application, the end of the cavity formed between the inner tube 61 and the outer tube 62 is a closed end, and the deformation member 9 is installed on the inner wall of the end of the inner tube 61;

[0044] Further, the high-temperature resistant support members 8 are detachably connected to the ends of the tube body.

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] As Figure 1 shown, the high-temperature lead-bismuth liquid alloy flow regulating valve in this embodiment is composed of a flow regulating valve and a buffer device 6. The buffer device 6 is detachably connected to the input end and the output end of the valve body 1 through flange bolts respectively. A high-temperature sealing gasket is provided at the flange interface to ensure airtightness under high-temperature working conditions, and the buffer device 6 can be detached independently, which is convenient for replacing the deformation part 9 or the buffer medium.

[0047] The pipe body of the buffer device 6 is composed of an inner pipe 61 and an outer pipe 62 nested coaxially at intervals. An annular cavity is formed between the inner pipe 61 and the outer pipe 62, and the end of this cavity is sealed by welding or sealant to prevent the buffer medium from leaking. The inner pipe 61 is axially provided with a first flow port 63 and a second flow port 66; a piston 65 is placed in the cavity of the inner pipe 61 and is hermetically connected to the inner pipe 61 (the seal is achieved through a high-temperature resistant sealing ring sleeved outside the piston 65), and the piston 65 can slide along the length direction of the inner pipe 61. Deformation parts 9 are installed at both ends of the pipe body respectively. The deformation parts 9 are high-temperature resistant elastic parts, and a detachable high-temperature resistant support part 8 is provided on the side facing away from the piston 65 (the high-temperature resistant support part 8 is in a circular plate-like structure, and external threads and internal threads are respectively provided on the peripheral side of the high-temperature resistant support part 8 and the inner side of the end of the inner pipe 61 to realize their threaded connection).

[0048] The buffer medium is selected as a silicon-based liquid metal buffer medium (such as Galinstan), and the filling rate ≥ 95%.

[0049] When the flow regulating valve is in the working state, the air pressure in the valve body remains balanced. As Figure 2 shown, at this time, the deformation parts 9 located at both ends of the buffer device maintain an equilibrium state;

[0050] When the flow regulating valve is closed and a positive water hammer effect is generated, as Figure 3 shown, the increased air pressure at the input end of the valve body 1 causes the deformation part 9 at the corresponding port to deform towards the piston side, pushing the piston 65 to move towards the output end side of the valve body 1. The buffer medium located on the side of the piston 65 close to the output end of the valve body 1 flows through the second flow port 66 close to the output end of the valve body 1 into the cavity between the inner pipe 61 and the outer pipe 62 (output end buffer cavity 67). The flow of the buffer medium absorbs energy and alleviates the positive water hammer effect;

[0051] When the flow regulating valve is opened and a negative water hammer effect is generated, asFigure 4 As shown, the increased air pressure at the output end of the valve body 1 causes the deformable member 9 at the corresponding port to deform towards the piston 65 side, pushing the piston 65 to move towards the input end side of the valve body 1. The buffer medium located on the side of the piston 65 close to the input end of the valve body 1 flows through the first flow port 63 close to the input end of the valve body 1 into the cavity between the inner tube 61 and the outer tube 62 (input end buffer cavity 64). Similarly, energy dissipation is achieved through the flow of the buffer medium, and the negative water hammer effect is alleviated.

[0052] It should be noted that:

[0053] In this embodiment, the gap between the inner tube 61 and the outer tube 62 is set to 2 mm to 5 mm, which is determined by comprehensively considering the high-temperature thermal expansion coefficient and the smoothness of the buffer medium flow. Within this gap range, it can not only ensure that the flow resistance of the buffer medium is small, but also avoid the structural interference between the inner tube and the outer tube caused by high-temperature thermal expansion.

[0054] The aperture diameters of the first flow port 63 and the second flow port 66 are larger than the particle diameter of the buffer medium to ensure that the buffer medium can pass through smoothly. Their spacing is at least 1.2 times the stroke of the piston 65 to ensure the effective buffer stroke of the piston.

[0055] The aperture diameter of the flow hole of the high-temperature resistant support member 8 is 3 mm. This aperture diameter can not only enable the air pressure in the valve body to act effectively on the deformable member 9, but also ensure the structural strength of the support member.

[0056] In this embodiment, the flow control valve includes a valve body 1, a valve stem 2, and a valve core 3.

[0057] A valve cavity is provided inside the valve body 1, and a valve seat 5 is provided in the valve cavity. The valve seat 5 is sealed and installed on the inner wall of the valve cavity.

[0058] A valve cover 7 is provided at the top of the valve body 1. Both ends of the tube body in the buffer device 6 are respectively connected to the input end and the output end of the valve body 1.

[0059] One end of the valve stem 2 is inserted into the valve cavity, and the other end passes through the valve cover 7 and is connected to the actuator 4.

[0060] The valve core 3 is connected to the end of the valve stem 2 inserted into the valve cavity. The valve core 3 is a V-shaped valve core;

[0061] The actuator 4 provides power and can be an electric actuator or a hydraulic actuator. The electric actuator has the characteristics of high control accuracy and fast response speed, and is suitable for scenarios with high requirements for flow regulation accuracy; the hydraulic actuator has a large output torque and is suitable for working conditions that require a large driving force. The actuator 4 drives the valve stem 2 to move the valve core 3 along the length direction (up and down direction) of the valve seat 5, adjusting the opening degree between the valve core 3 and the valve seat 5, thereby controlling the medium flow rate to meet the system requirements.

[0062] The valve body 1, the inner pipe 61, the outer pipe 62 and the piston 65 are all made of Inconel 718 alloy components. This alloy has good high-temperature resistance and corrosion resistance and is suitable for the high-temperature lead-bismuth alloy circulation system of nuclear reactors. The sliding connection between the piston 65 and the inner pipe 61 adopts the connection method of a conventional piston and a piston cylinder to ensure smooth piston movement.

Claims

1. A high-temperature lead-bismuth liquid alloy flow control valve, comprising a flow control valve, characterized in that: A buffer device is provided on the valve body of the flow regulating valve; The two ends of the buffer device are detachably connected to the input end and the output end of the valve body, respectively, so as to alleviate the positive and negative water hammer effects that occur when the flow regulating valve is closed and opened.

2. A high temperature lead-bismuth liquid alloy flow control valve according to claim 1, characterized in that: The buffer device comprises: a tube body and deformation members arranged at both ends of the tube body; The tube body comprises an inner tube and an outer tube which are nested from inside to outside; The inner tube wall is provided with a first flow opening and a second flow opening in the axial direction, a piston is provided on the inner side of the inner tube, and a buffer medium is filled in the cavity of the inner tube and the cavity formed by the inner tube and the outer tube; The end of the cavity between the inner tube and the outer tube is a closed end; The piston is sealed and connected to the inner tube, and slides along the length direction of the inner tube; The deformable members are respectively detachably connected to the inner walls of the ends of the inner tube; The first flow port and the second flow port are respectively located on both sides of the piston, and the first flow port and the second flow port are respectively communicated with the cavity of the inner tube and the cavity between the inner tube and the outer tube.

3. A high temperature lead-bismuth liquid alloy flow control valve according to claim 2, characterized in that: The flow regulating valve, the deformable member, the inner tube, the outer tube, and the piston are all high temperature resistant parts.

4. A high temperature lead-bismuth liquid alloy flow control valve according to claim 2, characterized in that: The inner tube, the outer tube and the valve body are components made of the same material.

5. A high temperature lead-bismuth liquid alloy flow control valve according to claim 2, characterized in that: A high temperature resistant support member is respectively provided on one side of the deformation member facing away from the piston; The high temperature resistant support member is installed at the end of the inner tube to prevent the deformable member from being drastically deformed toward one side of the valve body. The high temperature resistant support member is evenly provided with flow holes.

6. A high temperature lead-bismuth liquid alloy flow control valve according to claim 5, characterized in that: The high temperature resistant support member is detachably connected to the inner tube.

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