A driving cylinder for a valve

Abstract

The present disclosure relates to the technical field of air cylinders for valves, and in particular to a driving air cylinder for valves, the driving air cylinder for valves comprising: a cylinder body, the cylinder body being provided with a first accommodating chamber; a cylinder head assembly, the cylinder head assembly comprising a first cylinder head and a second cylinder head arranged on the cylinder body, the second cylinder head being provided with a first cavity and a first air flow channel which are interconnected, and a first sealing member being provided at the opening of the first cavity; a piston assembly, the piston assembly comprising a piston rod, a first piston and a piston seat, one end of the piston rod passing through the first cylinder head, and the other end of the piston rod being connected to the first piston; the first piston and the piston seat are located in the first accommodating chamber, the piston rod, the first piston and the piston seat move synchronously, the piston seat being arranged opposite to the first cavity, the piston seat being provided with a first channel and a second channel which are interconnected, and the first air flow channel is connected to the second channel.

Description

Technical Field

[0001] The present disclosure relates to the technical field of valve cylinders, and in particular to a valve driving cylinder. Background Art

[0002] Valves are an important fluid control equipment in industry, involving many sectors of the national economy, and are important basic equipment for the development of the national economy. After decades of development, my country's valve products have formed more than a dozen categories, especially in terms of the number of enterprises and production and sales volume. Valves are devices used to control the direction, pressure, and flow of fluids in fluid systems, so that the medium (liquid, gas, powder) in pipes and equipment can flow or stop and control its flow. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. They are control components in pipeline fluid transportation systems and have functions such as diversion, cutoff, throttling, check, diversion or overflow pressure relief.

[0003] The cylinder is the actuator of the valve. The valve reciprocates by the thrust and pull provided by the cylinder. The cylinder is a cylindrical metal part that guides the piston to perform linear reciprocating motion in the cylinder. The valve reciprocates at a fast speed when working, which requires the piston of the cylinder to move at a high speed when working. However, when the cylinder is running at high speed, it will bring great impact force at the end of the stroke. If the impact force of the piston on the cylinder head is not absorbed, it will not only cause a lot of noise, but also damage the cylinder and reduce the service life of the cylinder.

[0004] For this purpose, the patent No. 2021214791780 discloses a cylinder with a buffer mechanism, including a main body, a piston rod is arranged at the axis of the main body, a sealing ring is arranged on the outer wall of the piston rod, a rear cylinder cover is arranged on the side of the main body away from the sealing ring, a piston is arranged on the side of the piston rod away from the sealing ring, a No. 1 electromagnet is arranged on one side of the inner wall of the main body, a No. 2 electromagnet is arranged on the other side of the inner wall of the main body, a strong magnet is arranged on the outer wall of the piston, a No. 1 sensor is arranged on the side of the bottom of the inner wall of the main body close to the rear cylinder cover, a No. 2 sensor is arranged on the side of the bottom of the inner wall of the main body away from the rear cylinder cover, a rubber ring is arranged at one end of the piston rod, a guide sleeve is arranged on one side of the sealing ring, and a buffer device is arranged on the inner wall of the rear cylinder cover; the cylinder with a buffer mechanism can make the piston decelerate faster when it moves to the end of the stroke by setting an electromagnet, so as to achieve a better buffering effect. However, after the sensor is used for a period of time, its sensing accuracy often decreases to a certain extent, which will directly affect the buffering effect of the cylinder. Summary of the invention

[0005] In view of the deficiencies or problems existing in the prior art, the present invention provides a valve driving cylinder, the piston of which can be effectively buffered for a long time during operation.

[0006] The technical solution adopted by the present disclosure to solve the above technical problems is: a valve driving cylinder, comprising:

[0007] A cylinder body, wherein the cylinder body is provided with a first accommodating chamber;

[0008] A cylinder head assembly, the cylinder head assembly comprising a first cylinder head and a second cylinder head disposed on the cylinder body, the second cylinder head being provided with a first cavity and a first air flow channel that are interconnected, and a first sealing member being provided at an opening of the first cavity;

[0009] A piston assembly, the piston assembly comprising a piston rod, a first piston and a piston seat, one end of the piston rod passes through the first cylinder head, and the other end of the piston rod is connected to the first piston; the piston seat is connected to the first piston, the first piston and the piston seat are located in a first accommodating cavity, the piston rod, the first piston and the piston seat move synchronously, the piston seat is arranged facing the first cavity, and a first channel and a second channel that are interconnected are arranged on the piston seat, and the first air flow channel is connected to the second channel;

[0010] The first piston includes a first retraction state and a second retraction state. When the first piston is in the first retraction state, the piston seat is not in contact with the first sealing member, and the first accommodating chamber is directly connected to the first cavity. When the first piston is in the second retraction state, the piston seat is in contact with the first sealing member, and the first accommodating chamber is connected to the first cavity through the first channel and the second channel.

[0011] As a preferred embodiment, a first mounting groove is provided at the opening of the first cavity, the first sealing member is provided in the first mounting groove, the first sealing member is a one-way sealing ring, the first sealing member is an annular structure, a plurality of protrusions are provided on one side of the annular structure, a first gap is provided between two adjacent protrusions, a plurality of recesses are provided on the outer peripheral wall of the annular structure, the recesses are provided corresponding to the first gap, and one side of the protrusion of the first sealing member is provided toward the piston seat.

[0012] As a preferred embodiment, the second cylinder head is provided with a second air flow channel and first air holes, the first air holes are arranged along the thickness direction of the second cylinder head, and the first air holes are respectively connected with the first air flow channel and the second air flow channel.

[0013] As a preferred embodiment, the second cylinder head is further provided with a first connecting channel and a second air hole, the second air hole is connected to the first air flow channel, the second air hole is arranged along the thickness direction of the second cylinder head, and the first connecting channel is connected to the second air hole and the second air flow channel respectively.

[0014] As a preferred embodiment, a first regulating channel is also provided on the second cylinder head, the second air hole is communicated with the first regulating channel, a first regulating member is provided in the first regulating channel, and the intake flow rate of the second air hole is controlled by adjusting the position of the first regulating member in the first regulating channel.

[0015] As a preferred embodiment, a first accommodating hole is further provided on the second cylinder head, the first accommodating hole is communicated with the second air flow channel, and a first one-way valve is provided in the first accommodating hole.

[0016] As a preferred embodiment, the second channel is arranged inside the piston seat, and the second channel is arranged along the thickness direction of the piston seat.

[0017] As a preferred embodiment, a ventilation groove is provided on the surface of the piston seat, and the ventilation groove is arranged along the length direction of the piston seat. The length of the ventilation groove is smaller than the length of the piston seat. The first end of the piston seat is connected to the first piston, and the ventilation groove is arranged near the first end of the piston seat. One end of the first channel is arranged in the ventilation groove, and the other end is arranged on the inner circumferential wall of the second channel.

[0018] As a preferred embodiment, the first channel is arranged near the first end of the piston seat, and the first piston also includes a third retract state. When the first piston is in the third retract state, the piston seat contacts the first seal, the ventilation groove is at least partially located in the first cavity, and the first accommodating cavity is connected to the first cavity through the first channel and the ventilation groove respectively.

[0019] As a preferred embodiment, the end of the piston seat away from the first piston is the second end, and an open groove is provided on the end surface of the second end of the piston seat, the bottom of the open groove is connected to the second channel, and the open groove is used to connect the throttling assembly.

[0020] As a preferred embodiment, a second mounting groove is formed on the piston seat, a second sealing member is disposed in the second mounting groove, and the second sealing member is disposed between the piston seat and the first piston.

[0021] As a preferred embodiment, a second cavity and a third air flow channel that are interconnected are provided on the first cylinder head, and a third seal is provided at the opening of the second cavity; the first piston also includes a first forward state and a second forward state, when the first piston is in the first forward state, the first piston is not in contact with the third seal, and the first accommodating cavity is directly connected to the second cavity; when the first piston is in the second forward state, the first piston is in contact with the third seal, and the first accommodating cavity is not connected to the second cavity.

[0022] As a preferred embodiment, an annular protrusion is provided on a side of the first piston away from the piston seat, and a conical surface is provided at the end of the annular protrusion. When the first piston is in the second forward state, the conical surface contacts the third sealing member.

[0023] As a preferred embodiment, a third installation groove is provided at the opening of the second cavity, and the third sealing member is provided in the third installation groove.

[0024] As a preferred embodiment, a fourth air flow channel is provided on the first cylinder head, the third air flow channel is arranged along the thickness direction of the first cylinder head, and the fourth air flow channel is communicated with the third air flow channel.

[0025] As a preferred embodiment, a second communicating channel is further provided on the first cylinder head, and the fourth air flow channel and the third air flow channel are communicated with each other through the second communicating channel.

[0026] As a preferred embodiment, a second adjusting channel is also provided on the first cylinder head, the third airflow channel is communicated with the second adjusting channel, a second adjusting member is provided in the second adjusting channel, and the intake flow of the third airflow channel is controlled by adjusting the position of the second adjusting member in the second adjusting channel.

[0027] As a preferred embodiment, a second accommodating hole is further provided on the first cylinder head, the second accommodating hole is communicated with the fourth air flow channel, and a second one-way valve is provided in the second accommodating hole.

[0028] As a preferred embodiment, the first cylinder head is connected to a containing shell and a transmission assembly, the transmission assembly is used to connect the valve, the piston rod portion is located in the containing shell, the transmission assembly includes an outer shell and a transmission member, the transmission member is arranged inside the outer shell, and the outer shell is integrally formed with the first cylinder head and the containing shell.

[0029] As a preferred embodiment, a rack structure is provided at one end of the piston rod away from the first piston, and the transmission member is a gear, and the gear and the rack structure are meshed with each other.

[0030] Compared with the existing products, since the second cylinder head is provided with a first cavity and a first air flow channel that are interconnected, and the piston seat is provided with a first channel and a second channel that are interconnected, and the first air flow channel is connected to the second channel, when the first piston is in the first retracted state, the piston seat is not in contact with the first sealing member, the first accommodating cavity is directly connected to the first cavity, and the gas in the first accommodating cavity enters the first cavity and the first air flow channel in sequence from the first accommodating cavity and is discharged; when the first piston is in the second retracted state, the piston seat is in contact with the first sealing member, the piston seat blocks the opening of the first cavity, and the first accommodating cavity is connected to the first cavity through the first channel and the second channel, and the gas in the first accommodating cavity enters the first channel, the second channel, the first cavity and the first air flow channel in sequence and is discharged, and the first piston is in the second retracted state. The exhaust speed in the first retract state is much greater than the exhaust speed in the second retract state. Therefore, the speed at which the first piston moves toward the second cylinder head in the second retract state is much smaller than the speed at which the first piston moves toward the second cylinder head in the first retract state. The movement speed of the first piston in the second retract state is effectively and significantly reduced, thereby preventing the valve plate from hitting the valve body and protecting the valve member. The present application adjusts the flow rate of gas from the first accommodating chamber to the first air flow channel in the process of the first piston approaching the second cylinder head by setting the first channel and the second channel on the piston seat, thereby effectively adjusting the speed at which the first piston moves toward the second cylinder head. The structures of the first channel, the second channel and the first air flow channel in the present application are stable and will not fail over time and affect the buffering effect of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present application will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present application. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0032] Figure 1 This is one of the structural schematic diagrams of a valve driving cylinder disclosed in the present invention;

[0033] Figure 2 This is the second structural schematic diagram of a valve driving cylinder disclosed in the present invention;

[0034] Figure 3 is a cross-sectional view of a valve driving cylinder disclosed in the present invention;

[0035] Figure 4 This disclosure Figure 3 A partial enlarged view of the middle A;

[0036] Figure 5It is one of the structural schematic diagrams of the second cylinder head disclosed in the present invention;

[0037] Figure 6 This is the second structural schematic diagram of the second cylinder head disclosed in the present invention;

[0038] Figure 7 is one of the cross-sectional views of the second cylinder head of the present disclosure;

[0039] Figure 8 is the second cross-sectional view of the second cylinder head disclosed in the present invention;

[0040] Fig. 9 is a schematic structural diagram of the connection between the first cylinder head and the transmission assembly of the present disclosure;

[0041] Fig.10 is a cross-sectional view of a first cylinder head and a transmission assembly of the present disclosure;

[0042] Fig.11 is one of the cross-sectional views of the first cylinder head disclosed herein;

[0043] Fig.12 is the second cross-sectional view of the first cylinder head disclosed in the present invention;

[0044] Fig.13 is a schematic structural diagram of the piston seat disclosed in the present invention;

[0045] Fig.14 is a cross-sectional view of a piston seat of the present disclosure;

[0046] Fig.15 is a schematic structural diagram of a first piston disclosed in the present invention;

[0047] Fig.16 is one of the structural schematic diagrams of the first sealing member disclosed in the present invention;

[0048] Fig.17 This is the second structural schematic diagram of the first sealing member disclosed in the present invention.

[0049] Description of reference numerals:

[0050] 1. Cylinder body; 2. Second cylinder head; 3. First cylinder head; 4. First accommodating chamber; 5. First chamber; 6. First mounting groove; 7. Piston seat; 8. Piston rod; 9. First piston; 10. Transmission assembly; 11. First passage; 12. Second passage; 13. Ventilation groove; 14. Opening groove; 15. Accommodating shell; 16. Rack structure; 17. First air flow passage; 18. Second air flow passage; 19. Fourth air flow passage; 20. First annular groove; 21. Second annular groove; 22. First regulating channel; 23. Second regulating channel; 24. Second cavity; 25. First air hole; 26. Second air hole; 27. First accommodating hole; 28. Second accommodating hole; 29. ​​First connecting channel; 30. Second connecting channel; 32. Third air flow channel; 33. Second mounting groove; 36. Third mounting groove; 37. Conical surface; 38. First gap; 39. Concave; 40. Bump; 41. Fourth air hole. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is described in detail, clearly and completely in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0052] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0053] Please see Figure 1-Figure 5 and Fig.14As shown, the present application provides a valve driving cylinder, comprising: a cylinder body 1, the cylinder body 1 is provided with a first accommodating chamber 4; a cylinder head assembly, the cylinder head assembly comprises a first cylinder head 3 and a second cylinder head 2 arranged on the cylinder body 1, the second cylinder head 2 is provided with a first cavity 5 and a first air flow channel 17 that are interconnected, the lower end of the first air flow channel 17 is located on the inner wall of the first cavity 5, and a first sealing member is provided at the opening of the first cavity 5; a piston assembly, the piston assembly comprises a piston rod 8, a first piston 9 and a piston seat 7, one end of the piston rod 8 passes through the first cylinder head 3, and the other end of the piston rod 8 is connected to the first piston 9; the first piston 9 and the piston seat 7 are located in the first accommodating chamber 4, and the piston seat 7 is connected to the first air flow channel 17. A piston 9 is fixedly connected or connected by a thread, and the piston rod 8, the first piston 9 and the piston seat 7 move synchronously. The piston seat 7 is arranged opposite to the first cavity 5. The piston seat 7 is provided with a first channel 11 and a second channel 12 that are interconnected, and the first air flow channel 17 is connected to the second channel 12; the first piston 9 includes a first retract state and a second retract state. When the first piston 9 is in the first retract state, the piston seat 7 does not contact the first sealing member, and the first accommodating chamber 4 is directly connected to the first cavity 5; when the first piston 9 is in the second retract state, the piston seat 7 contacts the first sealing member, and the first accommodating chamber 4 is connected to the first cavity 5 through the first channel 11 and the second channel 12.Since the second cylinder head 2 is provided with the first cavity 5 and the first air flow channel 17 which are interconnected, and the piston seat 7 is provided with the first channel 11 and the second channel 12 which are interconnected, and the first air flow channel 17 is connected with the second channel 12, when the first piston 9 is in the first retracted state, the piston seat 7 is not in contact with the first sealing member, the first accommodating cavity 4 is directly connected with the first cavity 5, and the gas in the first accommodating cavity 4 sequentially enters the first cavity 5 and the first air flow channel 17 from the first accommodating cavity 4 and is discharged; when the first piston 9 is in the second retracted state, the piston seat 7 is in contact with the first sealing member, the piston seat 7 blocks the opening of the first cavity 5, and the first accommodating cavity 4 is connected with the first cavity 5 through the first channel 11 and the second channel 12, and the gas in the first accommodating cavity 4 sequentially enters the first channel 11, the second channel 12, the first cavity 5 and the first air flow channel 17 and is discharged, and the first piston 9 is in the first retracted state. The exhaust speed in the state is much greater than the exhaust speed in the second retract state. Therefore, the speed at which the first piston 9 moves toward the second cylinder head 2 in the second retract state is much smaller than the speed at which the first piston 9 moves toward the second cylinder head 2 in the first retract state. The moving speed of the first piston 9 in the second retract state is effectively and significantly reduced, thereby buffering the first piston 9, preventing the valve plate from hitting the valve body, and protecting the valve member; the present application adjusts the flow rate of gas from the first accommodating chamber 4 to the first air flow channel 17 in the process of the first piston 9 approaching the second cylinder head 2 by setting the first channel 11 and the second channel 12 on the piston seat 7, thereby effectively adjusting the speed at which the first piston 9 moves toward the second cylinder head 2; the structures of the first channel 11, the second channel 12 and the first air flow channel 17 in the present application are stable and will not fail over time to affect the buffering effect of the cylinder.

[0054] For further information, please also refer to Fig.16 and Fig.17 As shown, the opening of the first cavity 5 is provided with a first mounting groove 6, and the first sealing member is provided in the first mounting groove 6. Specifically, the first sealing member is a one-way sealing ring, and the first sealing member is an annular structure. A plurality of protrusions 40 are provided on one side of the annular structure, and a first gap 38 is provided between two adjacent protrusions 40. The outer peripheral wall of the annular structure is provided with a plurality of recesses 39, and the recesses 39 are provided corresponding to the first gap 38. The side of the first sealing member provided with the protrusions 40 faces the piston seat 7. When the piston seat 7 contacts the first sealing member, as the piston seat 7 continues to advance, the first sealing member will be squeezed, and the side of the first sealing member without the protrusions 40 is close to the inner wall of the first mounting groove 6. At this time, the gas in the first accommodating cavity 4 cannot directly enter the first cavity 5 from the opening of the first cavity 5. The recess 39 and the first gap 38 are provided to facilitate the gas in the first cavity 5 to enter the first accommodating cavity 4 through the recess 39 and the first gap 38 when the second cylinder head 2 is taking in air, even if the first seal is under the pressure of the piston seat 7.

[0055] Furthermore, a first annular groove 20 and a second annular groove 21 are provided on the outer peripheral wall of the first piston 9, and the first annular groove 20 is closer to the second cylinder head 2 than the second annular groove 21. A guide ring is provided in the first annular groove 20, which is used to guide the first piston 9 in the cylinder to ensure that it moves along the correct path, and on the other hand, the guide ring also supports the first piston 9 to prevent the first piston 9 from directly contacting the cylinder body 1 and reducing friction; a first sealing gasket is provided in the second annular groove 21, and specifically, the first sealing gasket is an O-ring, and the first sealing gasket is provided to prevent gas from flowing to the other side chamber of the first piston 9.

[0056] Please see Figure 5-Figure 8 As shown, in one embodiment of the present disclosure, the second cylinder head 2 is provided with a second air flow channel 18 and a first air hole 25, the first air hole 25 is arranged along the thickness direction of the second cylinder head 2, and the first air hole 25 is connected with the first air flow channel 17 and the second air flow channel 18 respectively. The second cylinder head 2 is also provided with a first connecting channel 29 and a second air hole 26, the surface of the second air hole 26 is blocked with a steel ball, the interior of the second air hole 26 is connected with the first air flow channel 17, the second air hole 26 is arranged along the thickness direction of the second cylinder head 2, and the first connecting channel 29 is connected with the second air flow channel 18 respectively. Specifically, the first air flow channel 17 and the second air flow channel 18 are arranged in parallel inside the second cylinder head 2, the interior of the second air hole 26 is connected with the second air flow channel 18 through the first connecting channel 29, and one end of the first air hole 25 is located in the second air flow channel 18. The gas in the first cavity 5 enters the first air flow channel 17 and flows to the second air hole 26, and then enters the first connecting channel 29 and the second air flow channel 18 in sequence, and finally is discharged from the cylinder through the first air hole 25.

[0057] It should be noted that, in the process of the first piston 9 advancing toward the second cylinder head 2, the gas in the first accommodating chamber 4 first enters the first cavity 5 and flows outward through the first air flow channel 17. When the first piston 9 is in the first retracted state, the piston seat 7 is not in contact with the first sealing member, the first accommodating chamber 4 is connected with the first cavity 5, and the gas in the first accommodating chamber 4 directly enters the first cavity 5, and then enters the first air flow channel 17, and finally is discharged from the first air hole 25. When the first piston 9 is in the second retracted state, since the piston seat 7 is in contact with the first sealing member, the piston seat 7 blocks the opening of the first cavity 5, and the first accommodating cavity 4 is connected with the first cavity 5 through the first channel 11 and the second channel 12. Since the first channel 11 has a narrow aperture, the amount of air entering the first cavity 5 through the first channel 11 is far less than the amount of air entering when the first accommodating cavity 4 is directly connected with the first cavity 5. Therefore, when the first piston 9 is in the second retracted state, the gas flow rate entering the first air flow channel 17 from the first cavity 5 is greatly reduced, so that the exhaust volume of the first air hole 25 is greatly reduced, so that the speed at which the first piston 9 advances toward the second cylinder head 2 is also greatly reduced.

[0058] In particular, the second cylinder head 2 is further provided with a first regulating channel 22, one end of the second air hole 26 is located in the first regulating channel 22, and a first regulating member is provided in the first regulating channel 22. The intake flow rate of the gas in the first air flow channel 17 entering the second air hole 26 is controlled by adjusting the position of the first regulating member in the first regulating channel 22. Specifically, the first regulating channel 22 is provided with an internal thread, the first regulating member is a conical member, and the conical member is provided with an external thread. The gap between the outer wall of the conical member and the inner wall of the first regulating channel 22 is adjusted by screwing the external thread with the internal thread. The larger the gap between the two, the larger the gas flow rate from the first air flow channel 17 to the second air hole 26. On the contrary, the smaller the gap between the two, the smaller the gas flow rate from the first air flow channel 17 to the second air hole 26, thereby adjusting the intake flow rate of the second air hole 26. It can be understood that when the second air hole 26 is completely blocked, the gas in the first air flow channel 17 will not be able to enter the second air hole 26. When the second air hole 26 is fully opened, the intake flow rate is the largest. The second air hole 26 is an adjustable hole. The user can adjust the gap between the outer wall of the cone and the inner wall of the first adjustment channel 22 as needed, thereby indirectly adjusting the exhaust volume of the first air hole 25 .

[0059] Please also see Fig.13 and Fig.14As shown, it should be noted that the second channel 12 is arranged inside the piston seat 7, and the second channel 12 is arranged along the thickness direction of the piston seat 7. A ventilation groove 13 is provided on the surface of the piston seat 7, and the ventilation groove 13 is arranged along the length direction of the piston seat 7. The ventilation groove 13 is preferably a waist-shaped groove, and the length of the ventilation groove 13 is less than the length of the piston seat 7. The first end of the piston seat 7 is connected to the first piston 9, and the ventilation groove 13 is arranged near the first end of the piston seat 7. One end of the first channel 11 is arranged in the ventilation groove 13, and the other end is arranged on the inner peripheral wall of the second channel 12. The first channel 11 is arranged near the first end of the piston seat 7. The first piston 9 also includes a third retract state. When the first piston 9 is in the third retract state, the piston seat 7 contacts the first sealing member. A portion of the ventilation groove 13 is located in the first cavity 5, and the other portion is located in the first accommodating cavity 4. The first accommodating cavity 4 is connected to the first cavity 5 in two ways. The first way: the first accommodating cavity 4 is connected to the first cavity 5 through the first channel 11 and the second channel 12; the second way: the first accommodating cavity 4 is connected to the first cavity 5 through the ventilation groove 13. In this way, the gas in the first accommodating groove can enter the first cavity 5 through the first through hole and the ventilation groove 13 respectively, and then enter the first air flow channel 17. When the first piston 9 is in the third retract state, the air flow entering the first air flow channel 17 is greater than the air flow when the first piston 9 is in the second retract state. It can be understood that when the first piston 9 is in the first retracted state, its speed of advancing toward the second cylinder head 2 is the fastest; when the first piston 9 is in the second retracted state, the ventilation groove 13 has not yet entered the first cavity 5, and the gas in the first accommodating chamber 4 can only enter the first cavity 5 through the first channel 11, and its speed of advancing toward the second cylinder head 2 is the slowest; when the first piston 9 is in the third retracted state, its speed of advancing toward the second cylinder head 2 is between the first retracted state and the second retracted state. It is understandable that when the first piston 9 is in the first retracted state, the distance between the first piston 9 and the second cylinder head 2 is still far, and it can be quickly advanced to meet the requirement of rapid opening or closing of the valve; when the first piston 9 is in the second retracted state, the distance between the first piston 9 and the second cylinder head 2 is already close, and the first piston 9 running quickly needs to be urgently decelerated, so the advancement speed of the first piston 9 in the second retracted state should be very slow; when the first piston 9 is in the third retracted state, the first piston 9 is closer to the second cylinder head 2, but because the speed of the first piston 9 is very slow at this time, it is necessary to increase the gas flow rate to speed up the advancement speed of the first piston 9, so as to meet the requirement of rapid opening or closing of the valve. When the first piston 9 is in the third retracted state, although the advancement speed of the first piston 9 to the second cylinder head 2 is accelerated, the advancement speed of the first piston 9 to the second cylinder head 2 is still slower than that in the first retracted state of the first piston 9.

[0060] Preferably, the end of the piston seat 7 away from the first piston 9 is the second end, and an open groove 14 is provided on the end surface of the second end of the piston seat 7, the bottom of the open groove 14 is communicated with the second channel 12, and the open groove 14 is used to connect the throttling component, so as to adjust the gas flow entering the first cavity 5. Specifically, the throttling component is a plug, and different plugs are provided with slots of different sizes. The user can select a plug with a slot of a suitable size according to the needs to adjust the gas flow from the second channel 12 into the first cavity 5, and then adjust the speed of the first piston 9 advancing toward the second cylinder head 2.

[0061] The piston seat 7 is provided with a second mounting groove 33 , in which a second sealing member is provided. The second sealing member is provided between the piston seat 7 and the first piston 9 to improve the air tightness between the first piston 9 and the piston seat 7 .

[0062] like Figure 9-12 As shown, in one embodiment of the present disclosure, the first cylinder head 3 is provided with a second cavity 24 and a third air flow channel 32 that are interconnected, and a third seal is provided at the opening of the second cavity 24; the first piston 9 includes a first forward state and a second forward state. When the first piston 9 is in the first forward state, the first piston 9 does not contact the third seal, and the first accommodating chamber 4 is directly connected to the second cavity 24; when the first piston 9 is in the second forward state, the first piston 9 contacts the third seal, and the first accommodating chamber 4 is not connected to the second cavity 24. Specifically, a third mounting groove 36 is provided at the opening of the second cavity 24, and the third seal is provided in the third mounting groove 36. An annular protrusion is provided on the side of the first piston 9 away from the piston seat 7, and a conical surface 37 is provided at the end of the annular protrusion. When the first piston 9 is in the second forward state, the conical surface 37 contacts the third seal. After the conical surface 37 contacts the third seal, the gas in the first accommodating chamber 4 cannot enter the second cavity 24.

[0063] Please also see Fig.15As shown, specifically, the first cylinder head 3 is provided with a third airflow channel 32 and a fourth airflow channel 19, the third airflow channel 32 is arranged along the thickness direction of the first cylinder head 3, and the third airflow channel 32 is connected with the fourth airflow channel 19. When the first piston 9 is in the first forward state, there is a large distance between the conical surface 37 and the third sealing member, a part of the gas in the first accommodating chamber 4 directly enters the third airflow channel 32 from the front end of the third airflow channel 32, and then is discharged from the fourth airflow channel 19, and the other part enters the second cavity 24 from the first accommodating chamber 4, and then enters the third airflow channel 32 from the rear end of the third airflow channel 32, and finally is discharged from the fourth airflow channel 19. When the first piston 9 is in the second forward state, after the conical surface 37 contacts the third sealing member, the gas in the first accommodating chamber 4 cannot enter the second cavity 24, and the gas can only enter the third airflow channel 32 from the front end of the third airflow channel 32. This is equivalent to that when the first piston 9 is in the second forward state, the total amount of gas entering the third air flow channel 32 is reduced, so the total amount of gas discharged from the fourth air flow channel 19 is also reduced accordingly, so that the propulsion speed of the first piston 9 toward the first cylinder head 3 is reduced, effectively preventing the first piston 9 from hitting the first cylinder head 3 at a faster speed.

[0064] In particular, the first cylinder head 3 is further provided with a second connecting channel 30, and the fourth airflow channel 19 and the third airflow channel 32 are connected through the second connecting channel 30. The first cylinder head 3 is also provided with a second regulating channel 23, and the third airflow channel 32 is cross-arranged with the second regulating channel 23. A second regulating member is provided in the second regulating channel 23, and the intake flow rate of the third airflow channel 32 is controlled by adjusting the position of the second regulating member in the second regulating channel 23. The second regulating channel 23 cooperates with the second regulating member to adjust the intake flow rate of the third airflow channel 32, and the regulating method is similar to that of the first regulating member, which will not be described here.

[0065] It should be noted that the cylinder in the present application is suitable for valves, especially swing valves, which require a very fast speed when opening and a slightly slower speed when closing. When the swing valve is opened, the first piston 9 in the cylinder pushes toward the second cylinder head 2, and when the swing valve is closed, the first piston 9 in the cylinder pushes toward the first cylinder head 3. Since the speed of the swing valve is relatively fast when it is opened, more buffer channels are set on the piston seat 7 and the second cylinder head 2 to buffer the first piston 9, thereby preventing the valve plate from hitting the valve body and protecting the valve components; since the speed of the swing valve is relatively slow when it is closed, there is no need to set more buffer channels on the first cylinder head 3 to buffer the first piston 9.

[0066] like Figure 7 , Figure 8 , Fig.11 and Fig.12As shown, in order to further control the gas flow rate of the first cylinder head 3 and the second cylinder head 2, a first accommodating hole 27 is further provided on the second cylinder head 2, the first accommodating hole 27 is communicated with the second air flow channel 18, and a first one-way valve is provided in the first accommodating hole 27. A second accommodating hole 28 is further provided on the first cylinder head 3, the second accommodating hole 28 is communicated with the fourth air flow channel 19, and a second one-way valve is provided in the second accommodating hole 28. The provision of the first one-way valve and the second one-way valve enables the first accommodating hole 27 and the second accommodating hole 28 to only allow air to enter but not to exhaust, which effectively controls the gas flow rate of the first cylinder head 3 and the second cylinder head 2 without affecting the efficiency of the first cylinder head 3 and the second cylinder head 2 when they are inlet.

[0067] It should be noted that the first cylinder head 3 is further provided with a fourth air hole 41 along its thickness direction, and the fourth air hole 41 is connected to the first air hole 25 through an external pipe. When the first piston 9 is pushed from the first cylinder head 3 to the second cylinder head 2, the gas in the cylinder is discharged from the first air hole 25, and the external air enters the cylinder through the fourth air flow channel 19; when the first piston 9 is pushed from the second cylinder head 2 to the first cylinder head 3, the gas in the cylinder is discharged from the fourth air flow channel 19, and the external air enters the cylinder through the fourth air hole 41 and the first air hole 25.

[0068] Please continue to see Fig. 9 and Fig.10 As shown, the first cylinder head 3 is connected with a housing 15 and a transmission assembly 10, the transmission assembly 10 is used to connect the valve, the piston rod 8 is partially located in the housing 15, the transmission assembly 10 includes a housing and a transmission member, the transmission member is arranged inside the housing, the housing, the first cylinder head 3 and the housing 15 are integrally formed, the end of the piston rod 8 away from the first piston 9 is provided with a rack structure 16, the transmission member is a gear, and the gear and the rack structure 16 are meshed with each other. The integral molding setting effectively ensures the accuracy during installation and avoids problems such as stuck and excessive wear of the gear and rack structure.

[0069] The present application is described in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A valve driving cylinder, characterized in that: include: A cylinder body (1), wherein the cylinder body (1) is provided with a first accommodating chamber (4); A cylinder head assembly, the cylinder head assembly comprising a first cylinder head (3) and a second cylinder head (2) arranged on a cylinder body (1), the second cylinder head (2) being provided with a first cavity (5) and a first air flow channel (17) which are interconnected, and a first sealing member being provided at an opening of the first cavity (5); A piston assembly, the piston assembly comprising a piston rod (8), a first piston (9) and a piston seat (7), one end of the piston rod (8) passes through the first cylinder head (3), and the other end of the piston rod (8) is connected to the first piston (9); the piston seat (7) is connected to the first piston (9), the first piston (9) and the piston seat (7) are located in a first accommodating chamber (4), the piston rod (8), the first piston (9) and the piston seat (7) move synchronously, the piston seat (7) is arranged facing the first cavity (5), and a first channel (11) and a second channel (12) which are connected to each other are arranged on the piston seat (7), and the first air flow channel (17) is connected to the second channel (12); The first piston (9) comprises a first retracted state and a second retracted state. When the first piston (9) is in the first retracted state, the piston seat (7) is not in contact with the first sealing member, and the first accommodating chamber (4) is directly connected to the first cavity (5). When the first piston (9) is in the second retracted state, the piston seat (7) is in contact with the first sealing member, and the first accommodating chamber (4) is connected to the first cavity (5) through the first channel (11) and the second channel (12). The second cylinder head (2) is provided with a second air flow channel (18) and a first air hole (25), and the first air hole (25) is communicated with the first air flow channel (17) and the second air flow channel (18) respectively; The second cylinder head (2) is further provided with a first communicating channel (29) and a second air hole (26), the second air hole (26) being in communication with the first air flow channel (17), and the first communicating channel (29) being in communication with the second air hole (26) and the second air flow channel (18) respectively; A vent groove (13) is provided on the surface of the piston seat (7), the vent groove (13) is arranged along the length direction of the piston seat (7), the length of the vent groove (13) is less than the length of the piston seat (7), the first end of the piston seat (7) is connected to the first piston (9), the vent groove (13) is arranged close to the first end of the piston seat (7), one end of the first channel (11) is arranged in the vent groove (13), and the other end is arranged on the inner peripheral wall of the second channel (12); The first channel (11) is arranged near the first end of the piston seat (7), and the first piston (9) further includes a third retracted state. When the first piston (9) is in the third retracted state, the piston seat (7) contacts the first sealing member, the ventilation groove (13) is at least partially located in the first cavity (5), and the first accommodating cavity (4) is connected to the first cavity (5) through the first channel (11) and the ventilation groove (13), respectively.

2. The valve driving cylinder according to claim 1, characterized in that: A first mounting groove (6) is provided at the opening of the first cavity (5), the first sealing member is provided in the first mounting groove (6), the first sealing member is a one-way sealing ring, the first sealing member is an annular structure, a plurality of protrusions (40) are provided on one side of the annular structure, a first gap (38) is provided between two adjacent protrusions (40), a plurality of recesses (39) are provided on the outer peripheral wall of the annular structure, the recesses (39) are provided corresponding to the first gaps (38), and a side of the first sealing member where the protrusions (40) are provided faces the piston seat (7).

3. The valve driving cylinder according to claim 1, characterized in that: The first air holes (25) are arranged along the thickness direction of the second cylinder head (2).

4. The valve driving cylinder according to claim 3, characterized in that: The second air holes (26) are arranged along the thickness direction of the second cylinder head (2).

5. The valve driving cylinder according to claim 4, characterized in that: The second cylinder head (2) is also provided with a first regulating channel (22), the second air hole (26) is in communication with the first regulating channel (22), a first regulating member is provided in the first regulating channel (22), and the intake flow rate of the second air hole (26) is controlled by adjusting the position of the first regulating member in the first regulating channel (22).

6. The valve driving cylinder according to claim 3, characterized in that: The second cylinder head (2) is also provided with a first accommodating hole (27), the first accommodating hole (27) being in communication with the second air flow channel (18), and a first one-way valve being provided in the first accommodating hole (27).

7. The valve driving cylinder according to claim 1, characterized in that: The end of the piston seat (7) away from the first piston (9) is the second end. An open groove (14) is provided on the end surface of the second end of the piston seat (7). The bottom of the open groove (14) is connected to the second channel (12). The open groove (14) is used to connect the throttling assembly.

8. The valve driving cylinder according to claim 1, characterized in that: The first cylinder head (3) is provided with a second cavity (24) and a third air flow channel (32) which are in communication with each other, and a third sealing member is provided at the opening of the second cavity (24); the first piston (9) comprises a first forward state and a second forward state, when the first piston (9) is in the first forward state, the first piston (9) is not in contact with the third sealing member, and the first accommodating cavity (4) is directly in communication with the second cavity (24); when the first piston (9) is in the second forward state, the first piston (9) is in contact with the third sealing member, and the first accommodating cavity (4) is not in communication with the second cavity (24).

9. The valve driving cylinder according to claim 8, characterized in that: The first cylinder head (3) is provided with A fourth air flow channel (19) is provided, the third air flow channel (32) is arranged along the thickness direction of the first cylinder head (3), and the fourth air flow channel (19) is connected to the third air flow channel (32).

10. The valve driving cylinder according to claim 9, characterized in that: The first cylinder head (3) is also provided with a second connecting channel (30), and the fourth air flow channel (19) and the third air flow channel (32) are connected via the second connecting channel (30).

11. The valve driving cylinder according to claim 8, characterized in that: The first cylinder head (3) is also provided with a second regulating channel (23), the third airflow channel (32) is in communication with the second regulating channel (23), a second regulating member is provided in the second regulating channel (23), and the intake flow rate of the third airflow channel (32) is controlled by adjusting the position of the second regulating member in the second regulating channel (23).

12. The valve driving cylinder according to claim 9, characterized in that: The first cylinder head (3) is also provided with a second accommodating hole (28), the second accommodating hole (28) being in communication with the fourth air flow channel (19), and a second one-way valve being provided in the second accommodating hole (28).

13. The valve driving cylinder according to claim 8, characterized in that: The first cylinder head (3) is connected to a containing shell (15) and a transmission assembly (10); the transmission assembly (10) is used to connect a valve; a piston rod (8) is partially located in the containing shell (15); the transmission assembly (10) comprises an outer shell and a transmission member; the transmission member is arranged inside the outer shell; the outer shell is integrally formed with the first cylinder head (3) and the containing shell (15).

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