A two-way isolation valve for high-temperature and high-pressure helium gas

Abstract

The present invention provides a two-way isolation valve for high-temperature and high-pressure helium. The two-way isolation valve for high-temperature and high-pressure helium includes: a lower connection port is further opened at the lower end of the valve body, a bottom cover is fixedly arranged below the lower connection port, a first conical surface and a straight table surface are respectively arranged on the inner wall of the valve body, a check valve core is detachably connected below the first conical surface, a first spring is fixedly connected between the check valve core and the bottom cover, and a valve core is detachably connected to the straight table; a pneumatic actuator is fixedly arranged above the valve cover, the movable end of the pneumatic actuator is fixedly connected to the valve core, and under the drive of the pneumatic actuator, the valve core abuts against or moves away from the straight table surface. According to the present invention, the check valve core is detachably connected below the first conical surface to prevent the helium from flowing back. A first spring is fixedly connected between the check valve core and the bottom cover. In the normal flow state, the first spring is compressed. When the external pipeline pressure changes, the helium flows back, the first spring restores its deformation, abuts against the first conical surface, and blocks the outflow of helium.

Description

Technical Field

[0001] The present invention relates to the technical field of isolation valves, and particularly to a two-way isolation valve for high-temperature and high-pressure helium gas. Background Art

[0002] In a high-temperature gas-cooled reactor, isolation valves are usually used to isolate helium gas. The isolation valve is a key device in the pipeline system, which can reliably and quickly cut off the high-temperature medium in the loop system in case of an accident in the pipeline system to ensure the safety of the pipeline system.

[0003] Since the isolation valves in the prior art are not suitable for high-temperature and high-pressure helium gas conditions and do not meet the requirements of short-time closing. Therefore, a two-way isolation valve for high-temperature and high-pressure helium gas is invented to improve the above problems. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects that the isolation valves in the prior art are not suitable for high-temperature and high-pressure helium gas conditions and do not meet the requirements of short-time closing, so as to provide a two-way isolation valve for high-temperature and high-pressure helium gas.

[0005] To solve the above problems, the present invention provides a two-way isolation valve for high-temperature and high-pressure helium gas, which includes:

[0006] A valve body and a valve cover. A first cavity is formed in the valve body. A first communication port and a second communication port are respectively opened at both ends of the valve body for connecting to external pipelines. An upper connection port is opened at the upper end of the valve body. The valve cover is arranged above the upper connection port and is detachably connected to the upper end of the valve body;

[0007] A lower connection port is further opened at the lower end of the valve body, and a bottom cover is fixedly arranged below the lower connection port;

[0008] The first communication port and the second communication port communicate with the first cavity to form a Z-shaped communication channel;

[0009] The inner walls of the straight channels of the Z-shaped communication channel are respectively provided with a first conical surface and a straight table surface. The first conical surface and the straight table surface are respectively located at the corners where the Z-shaped communication channel communicates with the first communication port and the second communication port. A check valve core is arranged below the first conical surface. A first spring is fixedly connected between the check valve core and the bottom cover. A valve core is detachably connected to the straight table surface;

[0010] An air-operated actuator is fixedly arranged above the valve cover. The movable end of the air-operated actuator is fixedly connected to the valve core. Under the drive of the air-operated actuator, the valve core abuts against or moves away from the straight table surface.

[0011] Preferably, mounting grooves are formed on both the bottom cover and the bottom of the check valve core, and both ends of the first spring are respectively abutted in the mounting grooves of the bottom cover and the check valve core.

[0012] Preferably, a second conical surface adapted to the first conical surface is provided at the bottom of the check valve core, and the angles between the first conical surface and the second conical surface and the horizontal direction are 60°.

[0013] Preferably, the valve core includes a main valve flap, a sub-valve flap, a valve flap cover and a valve stem. An arc surface is provided at the bottom of the main valve flap, and the arc surface is detachably connected to the straight table surface. The bottom of the sub-valve flap is fixedly connected inside the main valve flap. One end of the valve stem abuts against the sub-valve flap, and the other end of the valve stem passes through the valve cover and is fixedly connected to the movable end of the pneumatic actuator. The valve flap cover is clamped in the gap formed by the main valve flap, the sub-valve flap and the valve stem.

[0014] Preferably, a second cavity is formed between one end of the valve stem and the sub-valve flap.

[0015] Preferably, a stuffing box is further provided at the bottom of the valve cover. The stuffing box is fixedly connected to the upper connection port. The valve stem is slidably connected to the stuffing box. A plurality of bellows are provided at the bottom of the stuffing box. One end of the bellows is fixedly connected to the bottom of the stuffing box respectively, and the other end of the bellows is fixedly connected to the outer wall of the valve stem.

[0016] Preferably, the pneumatic actuator is a pneumatic actuator. A packing seal pair is provided between the movable end of the pneumatic actuator and the valve cover. The packing seal pair is fixedly connected to the valve cover, and the packing seal pair is slidably connected to the movable end of the pneumatic actuator.

[0017] The two-way isolation valve for high-temperature and high-pressure helium gas provided by the present invention has the following beneficial effects:

[0018] 1. In the present invention, the first communication port and the second communication port at both ends of the valve body are communicated with the external pipeline. An upper connection port is opened at the upper end of the valve body. The valve cover is arranged above the upper connection port. A lower connection port is further opened at the lower end of the valve body. A bottom cover is fixedly arranged below the lower connection port. The closed valve body, the valve cover and the bottom cover form a closed cavity. A first conical surface and a straight table surface are respectively arranged on the inner wall of the valve body. A check valve core is detachably connected below the first conical surface to prevent helium from flowing back. A first spring is fixedly connected between the check valve core and the bottom cover. In the normal flow state, helium flows in from the first communication port and flows out from the second communication port, and the first spring is compressed. When the pressure of the external pipeline changes, helium flows back, and the first spring restores its deformation to help the check valve core abut against the first conical surface to block the outflow of helium. A valve core is detachably connected to the straight table. During the normal flow through the first communication port, the opening and closing of the forward flow valve are realized by the abutment of the valve core and the straight table.

[0019] 2. The present invention also provides that a second conical surface adapted to the first conical surface is arranged on the check valve core, and the included angles between the first conical surface and the second conical surface and the horizontal direction are both 60°, which can make the fitting effect between the check valve core and the first conical surface when they are in contact;

[0020] 3. The present invention also uses a bellows as the active sealing power component for the valve to achieve reverse flow of the medium. When designing, it can fully consider that the acting force during the forward flow of the medium is greater than the ultimate load of this component; its working load must also be greater than the weight of the check valve core. It is also the key component for realizing the reverse cut-off of the medium in the valve and the key component for determining the smooth flow of the medium in the valve cavity. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the overall internal structure of the present invention;

[0022] Figure 2 is a schematic diagram of the partial structure of the present invention.

[0023] The reference numerals are shown as:

[0024] 1. Valve body; 2. Valve cover; 3. Bottom cover; 4. Pneumatic actuator; 5. Main valve flap; 6. Check valve core; 7. First spring; 8. Packing seal pair; 9. Installation groove; 10. Valve stem; 11. Bellows; 12. Metal gasket; 13. Valve flap cover; 14. Sub-valve flap; 15. Second cavity; 16. First conical surface; 17. Straight table surface; 18. Second conical surface. Detailed Embodiments

[0025] As Figure 1-2 shown, the present invention provides a two-way isolation valve for high-temperature and high-pressure helium gas, which includes:

[0026] It includes a valve body 1 and a valve cover 2. A first cavity is formed inside the valve body 1. A first communication port and a second communication port are respectively opened at both ends of the valve body 1 for connecting to external pipelines. An upper connection port is opened at the upper end of the valve body 1, and the valve cover 2 is arranged above the upper connection port and is detachably connected to the upper end of the valve body 1;

[0027] A lower connection port is also opened at the lower end of the valve body 1, and a bottom cover 3 is fixedly arranged below the lower connection port;

[0028] The first communication port and the second communication port communicate with the first cavity to form a Z-shaped communication channel;

[0029] The inner walls of the straight channels of the Z-shaped communication channels are respectively provided with a first conical surface 16 and a straight table surface 17. The first conical surface 16 and the straight table surface 17 are respectively located at the corners where the Z-shaped communication channels communicate with the first communication port and the second communication port. A check valve core 6 is arranged below the first conical surface 16. A first spring 7 is fixedly connected between the check valve core 6 and the bottom cover 3. A valve core is detachably connected to the straight table surface 17;

[0030] Above the valve cover 2, a pneumatic actuator 4 is fixedly arranged. The movable end of the pneumatic actuator 4 is fixedly connected to the valve core. Driven by the pneumatic actuator 4, the valve core abuts against or moves away from the straight table surface 17. As Figure 1-2 shown, the bidirectional isolation valve for high-temperature and high-pressure helium gas includes a valve body 1 and a valve cover 2. A first cavity is formed in the valve body 1 above the helium gas flow. It is communicated with the external pipeline through a first communication port and a second communication port at both ends of the valve body 1. An upper connection port is opened at the upper end of the valve body 1. The valve cover 2 is arranged above the upper connection port and is detachably connected to the upper end of the valve body 1, specifically by bolt connection. A lower connection port is also opened at the lower end of the valve body 1. A bottom cover 3 is fixedly arranged below the lower connection port; the first communication port and the second communication port communicate with the first cavity to form a Z-shaped communication channel; the inner walls of the straight channels of the Z-shaped communication channel are respectively provided with a first conical surface 16 and a straight table surface 17. The inner wall of the valve body 1 is respectively provided with a first conical surface 16 and a straight table surface 17. A check valve core 6 is detachably connected below the first conical surface 16 to prevent helium gas from flowing back. A first spring 7 is fixedly connected between the check valve core 6 and the bottom cover 3. In the normal flow state, helium gas flows in from the first communication port. When flowing out from the second communication port, the first spring 7 is compressed. When the pressure of the external pipeline changes, the helium gas flows back, and the first spring 7 resumes its deformation to help the check valve core 6 abut against the first conical surface 16 to block the outflow of helium gas. A valve core is detachably connected to the straight table. During the normal flow from the first communication port, the opening and closing of the forward flow valve are realized by the abutment of the valve core and the straight table.

[0031] In some embodiments, mounting grooves 9 are respectively opened on the bottom cover 3 and the bottom of the check valve core 6. The two ends of the first spring 7 respectively abut against the mounting grooves 9 of the bottom cover 3 and the check valve core 6. As Figure 1-2 shown, mounting grooves 9 are respectively opened on the bottom cover 3 and the bottom of the check valve core 6. The two ends of the first spring 7 are respectively sleeved in the mounting grooves 9 to form a limitation to help the contraction and restoration of the deformation of the first spring 7.

[0032] In some embodiments, a second conical surface 18 adapted to the first conical surface 16 is arranged at the bottom of the check valve core 6. The included angles between the first conical surface 16 and the second conical surface 18 and the horizontal direction are 60°. As Figure 1-2As shown, a second conical surface 18 adapted to the first conical surface 16 is provided on the check valve core 6. The included angles between the first conical surface 16 and the second conical surface 18 and the horizontal direction are 60°, which can make the fitting effect between the check valve core 6 and the first conical surface 16 when they are in contact with each other.

[0033] In some embodiments, the valve core includes a main valve flap 5, a sub-valve flap 14, a valve flap cover 13 and a valve stem 10. An arc surface is provided at the bottom of the main valve flap 5. The arc surface is detachably connected to the straight table surface 17. The bottom of the sub-valve flap 14 is fixedly connected inside the main valve flap 5. One end of the valve stem 10 abuts against the sub-valve flap 14. The other end of the valve stem 10 passes through the valve cover 2 and is fixedly connected to the movable end of the pneumatic actuator 4. The valve flap cover 13 is clamped in the gap formed by the main valve flap 5, the sub-valve flap 14 and the valve stem 10. As Figure 1-2 As shown, the valve core includes a main valve flap 5, a sub-valve flap 14, a valve flap cover 13 and a valve stem 10. An arc surface is provided at the bottom of the main valve flap 5. The arc surface is detachably connected to the straight table surface 17. The arc surface helps the valve core to fit with the straight table surface 17, so that effective flow grouping can be carried out. Stellite alloy is surfacing welded on the valve core and the straight table surface 17 to improve the erosion resistance of its sealing surface and service life. The bottom of the sub-valve flap 14 is fixedly connected inside the main valve flap 5. One end of the valve stem 10 abuts against the sub-valve flap 14. The other end of the valve stem 10 passes through the valve cover 2 and is fixedly connected to the movable end of the pneumatic actuator 4. The valve flap cover 13 is clamped in the gap formed by the main valve flap 5, the sub-valve flap 14 and the valve stem 10 to tightly fix the three.

[0034] In some embodiments, a second cavity 15 is formed between one end of the valve stem 10 and the sub-valve flap 14. As Figure 2 As shown, a second cavity 15 is formed between one end of the valve stem 10 and the sub-valve flap 14. The second cavity 15 helps to reduce the weight of the valve core.

[0035] In some embodiments, a metal gasket 12 is further provided at the bottom of the valve cover 2. The metal gasket 12 is fixedly connected to the upper connection port. A bellows 11 is provided at the bottom of the metal gasket 12. One end of the bellows 11 is fixedly connected to the bottom of the metal gasket 12 respectively. The other end of the bellows 11 is fixedly connected to the outer wall of the valve stem 10. As Figure 1-2As shown in the figure, a metal gasket 12 is further provided at the bottom of the valve cover 2. The metal gasket 12 is fixedly connected to the upper connection port. A bellows 11 is provided at the bottom of the metal gasket 12. One end of the bellows 11 is fixedly connected to the lower end of the metal gasket 12 respectively, and the other end of the bellows 11 is fixedly connected to the outer wall of the valve stem 10. The bellows 11 is the active sealing power component for the valve to achieve reverse flow of the medium. When designing it, the acting force during the forward flow of the medium should be fully considered to be greater than the ultimate load of this component; its working load must be greater than the weight of the check valve core 6, and it is also the key component to achieve reverse cut-off of the medium in the valve, and it is also the key component to determine the smooth flow of the medium in the valve cavity.

[0036] In some embodiments, the pneumatic actuator 4 is a pneumatic actuator. A packing seal pair 8 is provided between the movable end of the pneumatic actuator 4 and the valve cover 2. The packing seal pair 8 is fixedly connected to the valve cover 2, and the packing seal pair 8 is slidably connected to the movable end of the pneumatic actuator 4. As Figure 1-2 shown in the figure, the pneumatic actuator 4 is a pneumatic actuator, which is commercially available. It provides power support for the opening and closing of the valve and is the key component to achieve rapid closing of the valve. It is of piston type structure, the output motion is linear motion, and a spring mechanism is used for energy storage to quickly close the valve in case of system failure, so as to achieve the safety isolation function of the valve. A packing seal pair 8 is provided between the movable end of the pneumatic actuator 4 and the valve cover 2. The packing seal pair 8 is fixedly connected to the valve cover 2, and the packing seal pair 8 is slidably connected to the movable end of the pneumatic actuator 4. The packing seal pair 8 is composed of a packing seal ring, a packing gland, a packing pressing plate, a valve cover stuffing box and fasteners. The packing seal pair 8, as the second sealing structure of the valve, greatly improves the reliability and service life of the valve.

[0037] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and variations can be made, and these improvements and variations should also be regarded as within the protection scope of the present invention.

Claims

1. A two-way isolation valve for high-temperature and high-pressure helium gas, comprising a valve body (1) and a valve cover (2). A first cavity is formed inside the valve body (1). A first communication port and a second communication port are respectively opened at both ends of the valve body (1) for connecting to external pipelines. An upper connection port is opened at the upper end of the valve body (1). The valve cover (2) is arranged above the upper connection port and is detachably connected to the upper end of the valve body (1). It is characterized in that: A lower connection port is further opened at the lower end of the valve body (1), and a bottom cover (3) is fixedly arranged below the lower connection port; The first communication port and the second communication port communicate with the first cavity to form a Z-shaped communication channel; First conical surfaces (16) and straight table surfaces (17) are respectively arranged on the inner walls of the straight channels of the Z-shaped communication channel. The first conical surfaces (16) and the straight table surfaces (17) are respectively located at the corners where the Z-shaped communication channel communicates with the first communication port and the second communication port. A check valve core (6) is arranged below the first conical surface (16). A first spring (7) is fixedly connected between the check valve core (6) and the bottom cover (3). A valve core is detachably connected to the straight table surface (17); A pneumatic actuator (4) is fixedly arranged above the valve cover (2). The movable end of the pneumatic actuator (4) is fixedly connected to the valve core. Driven by the pneumatic actuator (4), the valve core abuts against or moves away from the straight table surface (17); Installation grooves (9) are opened on both the bottom cover (3) and the bottom of the check valve core (6). Both ends of the first spring (7) respectively abut against the installation grooves (9) of the bottom cover (3) and the check valve core (6); A second conical surface (18) adapted to the first conical surface (16) is arranged at the bottom of the check valve core (6). The included angles between the first conical surface (16) and the second conical surface (18) and the horizontal direction are 60°; 2. The two-way isolation valve for high-temperature and high-pressure helium gas according to claim 1, characterized in that: The valve core includes a main valve flap (5), a sub-valve flap (14), a valve flap cover (13) and a valve stem (10). An arc surface is arranged at the bottom of the main valve flap (5). The arc surface is detachably connected to the straight table surface (17). The bottom of the sub-valve flap (14) is fixedly connected inside the main valve flap (5). One end of the valve stem (10) abuts against the sub-valve flap (14). The other end of the valve stem (10) penetrates through the valve cover (2) and is fixedly connected to the movable end of the pneumatic actuator (4). The valve flap cover (13) is clamped in the gap formed by the main valve flap (5), the sub-valve flap (14) and the valve stem (10); 3. The two-way isolation valve for high-temperature and high-pressure helium gas according to claim 2, characterized in that: A second cavity (15) is formed between one end of the valve stem (10) and the sub-valve flap (14); 4. The two-way isolation valve for high-temperature and high-pressure helium gas according to claim 2, characterized in that: A metal gasket (12) is further provided at the bottom of the valve cover (2). The metal gasket (12) is fixedly connected to the upper connection port. A bellows (11) is provided at the lower end of the metal gasket (12). One end of the bellows (11) is fixedly connected to the bottom of the metal gasket (12), and the other end of the bellows (11) is fixedly connected to the outer wall of the valve stem (10).

5. The two-way isolation valve for high-temperature and high-pressure helium gas according to claim 1, wherein: The pneumatic actuator (4) is a pneumatic actuator. A packing seal pair (8) is provided between the movable end of the pneumatic actuator (4) and the valve cover (2). The packing seal pair (8) is fixedly connected to the valve cover (2), and the packing seal pair (8) is slidably connected to the movable end of the pneumatic actuator (4).

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