Pneumatic control high-pressure stop valve for high-pressure hydrogenation machine

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a pneumatic control high-pressure stop valve for a high-pressure hydrogenation machine, which comprises a valve body, and a cylinder component is arranged on the side wall of the valve body. One end of the cylinder body is provided with an upper end cover, and the other end of the cylinder body is provided with a lower end cover; a guide cylinder is arranged on the upper end cover, a partition plate is arranged in the cylinder body and divides the cylinder body into an upper cavity and a lower cavity, pistons are arranged in the upper cavity and the lower cavity, a connecting rod is arranged between the two pistons, a lower cushion block is arranged at one end of the connecting rod, and a driving valve rod is arranged at the other end of the connecting rod and connected with a sealing valve rod. An upper cushion block is arranged in the guide cylinder, and a reset spring is arranged between the upper cushion block and the lower cushion block; exhaust holes used for exhausting gas above the piston are formed in the positions, corresponding to the upper cavity and the lower cavity, of the cylinder body. A driving valve rod is connected to the sealing valve rod and connected with a piston, and pneumatic control of the high-pressure stop valve is achieved. The pistons are arranged in the upper cavity and the lower cavity, the two pistons drive the driving valve rod to move, the reaction speed of the pneumatic high-pressure stop valve is increased, and the control precision of the stop valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine. Background Technique

[0002] Valves are the main control components in fluid transportation, and high-pressure stop valves are one of the most widely used types of valves.

[0003] Most high-pressure stop valves are mainly manually controlled, with low control accuracy and difficulty in achieving automation. Therefore, pneumatic high-pressure stop valves are designed, but the currently used pneumatic high-pressure stop valves have a complex structure and slow pneumatic response, and cannot timely perform pneumatic control on the high-pressure stop valve, affecting the accuracy of fluid transportation control.

[0004] In view of the above problems, the present utility model document proposes a pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine. Content of the Utility Model

[0005] The utility model provides a pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine, which improves the pneumatic control reaction efficiency and the control accuracy of the high-pressure stop valve.

[0006] The utility model provides the following technical solutions:

[0007] A pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine, comprising a valve body. A valve cavity is opened in the valve body, and an installation cavity communicating with the valve cavity is opened on one side surface. An inlet flow channel and an outlet flow channel are respectively opened on two adjacent side surfaces. The inlet flow channel communicates with the middle side surface of the valve cavity, and the outlet flow channel communicates with the bottom side surface of the valve cavity. A sealing valve rod is slidably arranged in the installation cavity. One end of the sealing valve rod corresponds to the position where the outlet flow channel and the valve cavity are connected, and the other end is located outside the valve body. A cylinder assembly is connected to this side wall of the valve body;

[0008] The cylinder assembly includes a cylinder body. An upper end cover is provided at one end of the cylinder body, and a lower end cover is provided at the other end. A guide cylinder is provided on the upper end cover. A partition is provided in the cylinder body, dividing the interior of the cylinder body into an upper chamber and a lower chamber. Pistons are slidably arranged in both the upper chamber and the lower chamber. A connecting rod is fixedly arranged between the two pistons. One end of the connecting rod passes through the piston and is connected with a lower cushion block, and the other end passes through another piston and is connected with a driving valve rod. The driving valve rod is connected with the sealing valve rod. An upper cushion block is slidably arranged in the guide cylinder. A return spring is arranged between the upper cushion block and the lower cushion block;

[0009] Exhaust holes for discharging the gas above the piston are respectively opened on the cylinder body corresponding to the positions of the upper chamber and the lower chamber.

[0010] Further, an adjusting bolt is provided at the top of the guide cylinder, and one end of the adjusting bolt abuts against the upper cushion block.

[0011] Further, a guide ring is fixedly arranged on the lower surface of the lower end cover, and the guide ring is sleeved on the driving valve rod.

[0012] Further, a rectangular support frame is also arranged between the valve body and the cylinder block, and both symmetric sides of the support frame are fixedly connected to the valve body and the cylinder block respectively through bolts.

[0013] Further, two locking nuts are threadedly connected to the outside of the sealing valve rod, and a valve rod pointer is clamped between the two locking nuts; a scale is arranged at a position corresponding to the valve rod pointer on the side of the support frame.

[0014] Further, the diameter of the installation cavity is larger than that of the valve cavity, a clamping table is formed at the connection of the installation cavity and the valve cavity, a sealing filler is arranged in the installation cavity, the sealing filler is stacked on the clamping table, a pressing nut for pressing the sealing filler is arranged at the opening of the installation cavity, and the sealing valve rod is connected to the driving valve rod after passing through the sealing filler and the pressing nut.

[0015] Further, a support cylinder is also arranged on the side of the cylinder block, one end of the support cylinder is fixedly connected to the valve body, an anti - detachment piece is arranged at the other end, the anti - detachment piece is fixed on the support cylinder through screws, a clamping hole is formed in the anti - detachment piece, and the anti - detachment piece is clamped on the outer side wall of the pressing nut through the clamping hole.

[0016] Further, sealing rings are arranged on the side walls of the upper end cover, the side walls of the lower end cover, the side walls of the piston, the side walls of the partition plate, the contact surface between the lower end cover and the driving valve rod, and the contact surface between the partition plate and the connecting rod.

[0017] In the present utility model, by connecting a driving valve rod to the sealing valve rod, and the driving valve rod is connected to the piston, the pneumatic control of the high - pressure stop valve is realized; the cylinder block is divided into an upper chamber and a lower chamber, pistons are arranged in both the upper chamber and the lower chamber, and the driving valve rod is driven to move by two pistons, which improves the control response speed of the pneumatic high - pressure stop valve, and further improves the control accuracy of the high - pressure stop valve. Description of the Drawings

[0018] Figure 1 It is a schematic cross - sectional structure view of a pneumatic high - pressure stop valve for a high - pressure hydrogenation machine provided by an embodiment of the present utility model;

[0019] Figure 2 It is a schematic cross - sectional structure view of a cylinder assembly in a pneumatic high - pressure stop valve for a high - pressure hydrogenation machine provided by an embodiment of the present utility model.

[0020] Reference Signs:

[0021] 1. Valve body; 2. Inlet flow channel; 3. Outlet flow channel; 4. Valve cavity; 5. Installation cavity; 6. Sealing valve stem; 7. Sealing packing; 8. Compression nut; 9. Support cylinder; 10. Screw; 11. Anti - detachment piece; 12. Support frame; 13. Locking nut; 14. Valve stem pointer; 15. Cylinder block; 16. Lower end cover; 17. Upper end cover; 18. Partition board; 19. Piston; 20. Driving valve stem; 21. Connecting rod; 22. Lower cushion block; 23. Guide cylinder; 24. Upper cushion block; 25. Return spring; 26. Adjusting bolt; 27. Guide ring; 28. Exhaust hole; 29. Sealing ring; 30. Scale. Detailed implementation manners

[0022] The embodiments of the present utility model will be described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0023] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connection" and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non - detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct communication or an indirect communication through an intermediate medium. Among them, "fixing" means that they are connected to each other and the relative positional relationship after connection remains unchanged. The orientation terms mentioned in the embodiments of the present utility model, such as "inside", "outside", "top", "bottom", etc., are only with reference to the direction of the accompanying drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present utility model.

[0024] In the embodiments of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0025] In the embodiments of the present utility model, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0026] References to "one embodiment" or "some embodiments" or the like described in this specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present utility model. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc., which appear in different places in this specification, do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants mean "including but not limited to", unless otherwise specifically emphasized.

[0027] Embodiment:

[0028] Referring to Figure 1 and Figure 2 As shown, a pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine includes a valve body 1. A valve cavity 4 is formed in the valve body 1. An installation cavity 5 communicating with the valve cavity 4 is formed on one side surface. An inlet flow channel 2 and an outlet flow channel 3 are respectively formed on two adjacent side surfaces. The inlet flow channel 2 communicates with the middle side surface of the valve cavity 4, and the outlet flow channel 3 communicates with the bottom side surface of the valve cavity 4. A sealing valve stem 6 is slidably arranged in the installation cavity 5. One end of the sealing valve stem 6 corresponds to the position where the outlet flow channel 3 and the valve cavity 4 are connected, and the other end is located outside the valve body 1. A cylinder assembly is connected to this side wall of the valve body 1;

[0029] The cylinder assembly includes a cylinder body 15. An upper end cover 17 is provided at one end of the cylinder body 15, and a lower end cover 16 is provided at the other end. A guide cylinder 23 is provided on the upper end cover 17. A partition plate 18 is provided in the cylinder body 15 to divide the interior of the cylinder body 15 into an upper chamber and a lower chamber. Pistons 19 are slidably arranged in both the upper chamber and the lower chamber. A connecting rod 21 is fixedly arranged between the two pistons 19. One end of the connecting rod 21 passes through the piston 19 and is connected with a lower cushion block 22, and the other end passes through another piston 19 and is connected with a driving valve stem 20. The driving valve stem 20 is connected with the sealing valve stem 6. An upper cushion block 24 is slidably arranged in the guide cylinder 23. A return spring 25 is arranged between the upper cushion block 24 and the lower cushion block 22;

[0030] Exhaust holes 28 for discharging the gas above the pistons 19 are formed in the cylinder body 15 corresponding to the positions of the upper chamber and the lower chamber.

[0031] The two pistons 19 are connected by a connecting rod 21, so that the pressures received by the two pistons 19 can both act on the connecting rod 21. The connecting rod 21 is connected to a driving valve rod 20, and the driving valve rod 20 is connected to a sealing valve rod 6. One end of the sealing valve rod 6 corresponds to the position where it is connected to the outflow passage 3 and the valve cavity 4, so that the sealing valve rod 6 can control the connection relationship between the outflow passage 3 and the valve cavity 4, thereby controlling the opening and closing of the stop valve. The forces on the two pistons 19 are used to control the movement of the sealing valve rod 6, improving the reaction speed of the pneumatically controlled high-pressure stop valve and the control accuracy of the high-pressure stop valve for the fluid conveying pipeline.

[0032] A guide cylinder 23 is provided above the cylinder block 15. There is an upper cushion block 24 inside the guide cylinder 23, and a return spring 25 is arranged between the upper cushion block 24 and the lower cushion block 22. When the connecting rod 21 is driven by the piston 19 to move upward, it will drive the lower cushion block 22 to move together. The lower cushion block 22 squeezes the return spring 25, causing the return spring 25 to be stressed and contract. When the external air supply pipeline is closed, the piston 19 is no longer pushed by the air pressure. At this time, the elastic force of the return spring 25 acts on the connecting rod 21, driving the piston 19 back to the initial position through the connecting rod 21, and at the same time driving the driving valve rod 20 to move. The driving valve rod 20 drives the sealing valve rod 6 to move, so that the sealing valve rod 6 abuts against the connection between the valve cavity 4 and the outflow passage 3, thereby closing the high-pressure stop valve.

[0033] The exhaust hole 28 on the cylinder block 15 is used to discharge the gas in the upper chamber and the upper part of the lower chamber above the piston 19, preventing the air pressure above the piston 19 from being too high when the piston 19 moves upward, which affects the moving distance of the piston 19 and further affects the opening degree of the high-pressure stop valve.

[0034] An adjusting bolt 26 is provided at the top of the guide cylinder 23, and one end of the adjusting bolt 26 abuts against the upper cushion block 24.

[0035] By adjusting the length of the adjusting bolt 26 in the guide cylinder 23, the position of the upper cushion block 24 in the guide cylinder 23 is adjusted, thereby adjusting the elastic force of the return spring 25, facilitating the user to adjust the elastic force of the return spring 25 according to the air pressure of the external air supply line, and then adjusting the moving distance of the sealing valve rod 6 to ensure that the high-pressure stop valve can be fully opened.

[0036] A guide ring 27 is fixedly arranged on the lower surface of the lower end cover 16, and the guide ring 27 is sleeved on the driving valve rod 20.

[0037] The guide ring 27 ensures the stability of the moving direction of the driving valve stem 20 when it is driven by the connecting rod 21, thereby ensuring the stability of the action on the sealing valve stem 6, ensuring that the driving valve stem 20 does not deflect, and preventing the sealing valve stem 6 from deflecting. The deflection of the sealing valve stem 6 will increase the friction between the sealing valve stem 6 and the valve body 1, resulting in damage to the sealing valve stem 6 and the valve body 1, affecting the sealing performance of the stop valve and reducing the service life of the medium valve. Therefore, the guide ring 27 improves the stability of the movement of the driving valve stem 20.

[0038] A rectangular support frame 12 is also provided between the valve body 1 and the cylinder block 15. Both symmetric sides of the support frame 12 are fixedly connected to the valve body 1 and the cylinder block 15 respectively by bolts.

[0039] Since the sealing valve stem 6 and the driving valve stem 20 have a certain length, the support frame 12 improves the stability of the connection between the sealing valve stem 6 and the driving valve stem 20, avoiding loosening of the connection and preventing the accurate pneumatic control of the sealing valve stem 6.

[0040] Two locking nuts 13 are threadedly connected to the outside of the sealing valve stem 6, and a valve stem pointer 14 is clamped between the two locking nuts 13; a scale 30 is provided at the side of the support frame 12 corresponding to the position of the valve stem pointer 14.

[0041] The cooperation of the valve stem pointer 14 and the scale 30 facilitates the viewing of the moving distance of the sealing valve stem 6, thereby understanding the opening degree of the stop valve and facilitating the user to adjust the adjusting bolt 26 to adjust the moving distance of the sealing valve stem 6.

[0042] The diameter of the installation cavity 5 is larger than that of the valve cavity 4. A clamping table is formed at the connection between the installation cavity 5 and the valve cavity 4. A sealing packing 7 is provided in the installation cavity 5. The sealing packing 7 is stacked on the clamping table. A pressing nut 8 for pressing the sealing packing 7 is provided at the opening of the installation cavity 5. The sealing valve stem 6 passes through the sealing packing 7 and the pressing nut 8 and is connected to the driving valve stem 20.

[0043] The sealing packing 7 improves the sealing performance at the sealing valve stem 6, thereby improving the sealing performance of the installation cavity 5 and preventing fluid leakage from the installation cavity 5. The pressing nut 8 presses the sealing packing 7, making the sealing packing 7 closely fit the side wall of the sealing valve stem 6 to ensure the sealing effect.

[0044] A support cylinder 9 is also provided on the side of the cylinder block 15. One end of the support cylinder 9 is fixedly connected to the valve body 1, and an anti - detachment piece 11 is provided at the other end. The anti - detachment piece 11 is fixed on the support cylinder 9 by screws 10. A clamping hole is opened on the anti - detachment piece 11, and the anti - detachment piece 11 is clamped on the outer side wall of the pressing nut 8 through the clamping hole.

[0045] The anti-loosening piece 11 is fixed by the support cylinder 9, and the anti-loosening piece 11 prevents the compression nut 8 from loosening, thereby avoiding the situation where the compression nut 8 cannot compress the sealing packing 7, ensuring the sealing performance between the sealing packing 7 and the sealing valve stem 6, and further ensuring the sealing performance of the stop valve.

[0046] Sealing rings 29 are provided on the side walls of the upper end cover 17, the side walls of the lower end cover 16, the side walls of the piston 19, the side walls of the partition plate 18, the contact surface between the lower end cover 16 and the driving valve stem 20, and the contact surface between the partition plate 18 and the connecting rod 21.

[0047] The sealing effect of the cylinder assembly is improved by the sealing rings 29 to prevent gas leakage, which may affect the control accuracy of the cylinder assembly on the sealing valve stem 6.

[0048] During use, the high-pressure stop valve is connected to the fluid pipeline through the inlet channel 2 and the outlet channel 3. Then, the external gas supply pipeline is connected to the position below the piston 19 in the upper chamber and the lower chamber. When the external gas supply pipeline does not supply gas, the return spring 25 presses the lower cushion block 22, and then presses the connecting rod 21. At this time, both pistons 19 are located at positions close to the bottom of the upper chamber and the lower chamber, and the driving valve stem 20 presses the sealing valve stem 6 downward, so that the end of the sealing valve stem 6 abuts against the connection between the outlet channel 3 and the valve cavity 4. At this time, the high-pressure stop valve is in the closed state. If the high-pressure stop valve needs to be opened, gas is supplied to the upper chamber and the lower chamber through the external gas supply pipeline, so that the air pressure received by the lower surfaces of the two pistons 19 increases, and the pistons 19 move upward. The gas on the upper surfaces of the pistons 19 is discharged from the exhaust holes 28 to prevent the air pressure on the upper surfaces of the pistons 19 from being too high, which may cause the pistons 19 to be unable to move. The upward movement of the pistons 19 drives the connecting rod 21 to move. When the upward force received by the connecting rod 21 is greater than the elastic force of the return spring 25, the connecting rod 21 moves to drive the lower cushion block 22 to move upward, compresses the return spring 25 at the same time, and the connecting rod 21 drives the driving valve stem 20 to move upward. The driving valve stem 20 drives the sealing valve stem 6 to move upward. The upward movement of the sealing valve stem 6 makes the outlet channel 3 communicate with the valve cavity 4, and the inlet channel 2 communicate with the valve cavity 4, so that the high-pressure stop valve is in the open state. If the high-pressure stop valve needs to be closed, the external gas supply pipeline is stopped. Under the action of the elastic force of the return spring 25, the return spring 25 presses the lower cushion block 22 downward, and at the same time presses the connecting rod 21, the driving valve stem 20 and the sealing valve stem 6 downward, and then closes the high-pressure stop valve through the sealing valve stem 6.

[0049] During actual use, first confirm the moving distance of the sealing valve stem 6 when the high-pressure stop valve is fully opened, and then adjust the position of the adjusting bolt 26 in the guiding cylinder 23 according to the air pressure of the external gas supply pipeline, thereby adjusting the position of the upper cushion block 24, so as to adjust the elastic force of the return spring 25, and further adjust the moving distance of the sealing valve stem 6. During use, the user can view the moving distance of the sealing valve stem 6 through the position of the scale 30 indicated by the valve stem pointer 14.

[0050] In actual use, the end of the driving valve stem 20 is threadedly connected to the end of the sealing valve stem 6 to ensure the stability of the connection structure during axial movement.

[0051] The utility model can quickly control the opening and closing of the high-pressure stop valve, improve the control response speed of the pneumatic high-pressure stop valve, and further improve the control accuracy of the high-pressure stop valve.

[0052] The above is only the specific implementation manner of the utility model, but the protection scope of the utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the utility model; without conflict, the embodiments of the utility model and the features in the embodiments can be combined with each other. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine, characterized in that, It includes a valve body, within which a valve cavity is formed. An installation cavity communicating with the valve cavity is formed on one side surface, and an inlet flow channel and an outlet flow channel are respectively formed on two adjacent side surfaces. The inlet flow channel communicates with the middle side surface of the valve cavity, and the outlet flow channel communicates with the bottom side surface of the valve cavity. A sealing valve stem is slidably arranged within the installation cavity. One end of the sealing valve stem corresponds to the position where the outlet flow channel is connected to the valve cavity, and the other end is located outside the valve body. A cylinder assembly is connected to this side wall of the valve body; The cylinder assembly includes a cylinder body, with an upper end cover provided at one end and a lower end cover provided at the other end; a guide cylinder is provided on the upper end cover. A partition is provided within the cylinder body, dividing the interior of the cylinder body into an upper chamber and a lower chamber. Pistons are slidably arranged within both the upper chamber and the lower chamber. A connecting rod is fixedly arranged between the two pistons. One end of the connecting rod passes through the piston and is connected with a lower cushion block, and the other end passes through the other piston and is connected with a driving valve stem, and the driving valve stem is connected with the sealing valve stem; an upper cushion block is slidably arranged within the guide cylinder, and a return spring is arranged between the upper cushion block and the lower cushion block; Exhaust holes for discharging the gas above the pistons are respectively formed on the cylinder body corresponding to the positions of the upper chamber and the lower chamber.

2. The pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine according to claim 1, wherein, An adjusting bolt is provided at the top of the guide cylinder, and one end of the adjusting bolt abuts against the upper cushion block.

3. The pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine according to claim 1, wherein A guide ring is fixedly arranged on the lower surface of the lower end cover, and the guide ring is sleeved on the driving valve stem.

4. A pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine according to claim 1, characterized in that, A rectangular support frame is further provided between the valve body and the cylinder body. Both symmetric sides of the support frame are fixedly connected to the valve body and the cylinder body respectively through bolts.

5. A pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine according to claim 4, characterized in that, Two locking nuts are threadedly connected to the outer side of the sealing valve stem, and a valve stem pointer is clamped between the two locking nuts; a scale is provided on the side of the support frame corresponding to the position of the valve stem pointer.

6. The pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine according to claim 1, characterized in that, The diameter of the installation cavity is larger than that of the valve cavity, and a clamping platform is formed at the connection between the installation cavity and the valve cavity. A sealing packing is arranged within the installation cavity, and the sealing packing is stacked on the clamping platform. A compression nut for pressing the sealing packing is provided at the opening of the installation cavity, and the sealing valve stem passes through the sealing packing and the compression nut and is then connected with the driving valve stem.

7. The pneumatically controlled high-pressure stop valve for a high-pressure hydrogenation machine according to claim 6, characterized in that, A support cylinder is further provided on the side surface of the cylinder body. One end of the support cylinder is fixedly connected to the valve body, and an anti - detachment piece is provided at the other end. The anti - detachment piece is fixed on the support cylinder through screws. A clamping hole is formed on the anti - detachment piece, and the anti - detachment piece is clamped on the outer side wall of the compression nut through the clamping hole.

8. A pneumatically controlled high-pressure shut-off valve for a high-pressure hydrogenation machine according to claim 1, characterized in that, Sealing rings are provided on the side walls of the upper end cover, the side walls of the lower end cover, the side walls of the pistons, the side walls of the partitions, the contact surface between the lower end cover and the driving valve stem, and the contact surface between the partition and the connecting rod.

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