Air cylinder

Abstract

The utility model relates to the technical field of air cylinders, in particular to an air cylinder which comprises a cylinder body. The end cover assembly comprises a front end cover and a rear end cover which are arranged at the two ends of the cylinder body; the piston assembly comprises a piston rod and a first piston, the first piston is arranged in the cylinder body, one end of the piston rod penetrates through the front end cover, and the other end of the piston rod is connected with the first piston; the guide rod assembly is arranged in the cylinder body, and the guide rod assembly penetrates through the first piston and is used for limiting the first piston in the circumferential direction; the guide rod assembly comprises a first guide rod, the first end of the first guide rod is connected with the front end cover, and the second end of the first guide rod is connected with the rear end cover. Due to the fact that the guide rod assembly is arranged in the cylinder body and penetrates through the first piston to be used for limiting the first piston in the circumferential direction, the first piston can be effectively prevented from rotating under the condition that external force is too large.

Description

Technical Field

[0001] This disclosure relates to the field of cylinder technology, and in particular to a cylinder. Background Technology

[0002] A cylinder is a cylindrical metal component that guides a piston to perform linear reciprocating motion inside the cylinder.

[0003] In traditional valve cylinders, the piston and piston rod are not additionally fixed and are connected by their own friction. If the external rotational force is too large, the piston will rotate, which may lead to transmission failure. Utility Model Content

[0004] In view of the shortcomings or problems existing in the prior art, this disclosure provides a cylinder in which the piston is well limited, effectively preventing the piston from rotating during operation.

[0005] The technical solution adopted in this disclosure to solve the above-mentioned technical problem is: a cylinder, comprising:

[0006] Cylinder block;

[0007] End cap assembly, the end cap assembly including a front end cap and a rear end cap disposed at both ends of the cylinder body;

[0008] A piston assembly, the piston assembly including a piston rod and a first piston, the first piston being disposed in a cylinder, one end of the piston rod passing through a front end cover, and the other end of the piston rod being connected to the first piston;

[0009] A guide rod assembly is disposed in the cylinder body and passes through the first piston to limit the circumferential movement of the first piston.

[0010] In a preferred embodiment, the guide rod assembly includes a first guide rod, a first end of which is connected to the front end cover, and a second end of which is connected to the rear end cover.

[0011] In a preferred embodiment, the front cover is provided with a first mounting groove, the rear cover is provided with a second mounting groove, the first end of the first guide rod is provided in the first mounting groove, and the second end of the first guide rod is provided in the second mounting groove.

[0012] In a preferred embodiment, the guide rod assembly further includes a second guide rod. The first and second guide rods are respectively arranged parallel to each other on both sides of the piston rod. The first piston has a first limiting hole and a second limiting hole along its thickness direction. The first guide rod passes through the first limiting hole, and the second guide rod passes through the second limiting hole. The arrangement of the first and second guide rods can circumferentially limit the first piston, preventing the first piston from rotating when an excessive external rotational force is applied.

[0013] In a preferred embodiment, the inner peripheral walls of the first limiting hole and the second limiting hole are respectively provided with at least two annular recesses, and a sealing element adapted to its shape is provided in the annular recess.

[0014] In a preferred embodiment, the front end cover is provided with a third mounting groove, the rear end cover is provided with a fourth mounting groove, the first end of the second guide rod is provided in the third mounting groove, and the second end of the second guide rod is provided in the fourth mounting groove.

[0015] In a preferred embodiment, a first airflow channel is provided at the first end of the first guide rod, a second airflow channel is provided at the second end of the first guide rod, a first air inlet / outlet is provided on the front end cover and communicates with the first airflow channel, and a second air inlet / outlet is provided on the rear end cover and communicates with the second airflow channel. The gas in the cylinder flows to the first air inlet / outlet through the first airflow channel or to the second air inlet / outlet through the second airflow channel.

[0016] In a preferred embodiment, the first airflow channel includes a first channel and a second channel that are interconnected, the first channel and the second channel being arranged at an angle to each other, and the second channel being connected to a first inlet / outlet. The angled arrangement of the first channel and the second channel causes the gas to flow towards the first inlet / outlet in a detour, thereby slowing down the gas flow rate.

[0017] In a preferred embodiment, the first airflow channel further includes a third channel, which is connected to the first channel. The first channel is located between the second channel and the third channel. Gas enters through the third channel and flows through the second channel to the first inlet / outlet.

[0018] In a preferred embodiment, a flow guide groove is provided on the side of the first guide rod, and the flow guide groove is a third channel; a first through hole is provided at the bottom of the flow guide groove, and the first through hole is a first channel; a second through hole is provided on the end face of the first guide rod along its length direction, and the second through hole is a second channel.

[0019] In a preferred embodiment, the second channel and the third channel are parallel to the axial direction of the first guide rod, and the first channel is perpendicular to the axial direction of the first guide rod.

[0020] In a preferred embodiment, the front cover and the rear cover are respectively provided with connecting channels. The first airflow channel is connected to the first air inlet / outlet through the connecting channel on the front cover, and the second airflow channel is connected to the second air inlet / outlet through the connecting channel on the rear cover.

[0021] In a preferred embodiment, the connection channel includes a first connection channel and a second connection channel that are interconnected, the first connection channel and the second connection channel are perpendicular to each other, the first connection channel is connected to a first air inlet / outlet, and the second connection channel is connected to a second channel.

[0022] In a preferred embodiment, the inner diameter of the first channel is smaller than the inner diameter of the second channel; the inner diameter of the connecting channel is smaller than the inner diameter of the second channel.

[0023] In a preferred embodiment, the first airflow channel further includes at least one fourth channel, which is connected to the second channel, and the axis of the fourth channel is on the same plane as the axis of the first channel. When the first piston does not block the inlets of the fourth channel and the first channel, gas can also enter the second channel through the fourth channel. The arrangement of the fourth channel allows gas to enter the second channel simultaneously from multiple channels and then be discharged. In this way, when the first piston does not block the fourth channel, the gas has a relatively large outflow rate, thereby making the first piston run relatively fast in the early stage.

[0024] In a preferred embodiment, the structure of the second airflow channel is the same as that of the first airflow channel.

[0025] In a preferred embodiment, the front end cover is provided with a first connecting protrusion, and a first sealing ring is provided between the outer peripheral wall of the first connecting protrusion and the inner peripheral wall of the cylinder body, the height of the first sealing ring exceeding the end face of the first connecting protrusion; the rear end cover is provided with a second connecting protrusion, and a second sealing ring is provided between the outer peripheral wall of the second connecting protrusion and the inner peripheral wall of the cylinder body, the height of the second sealing ring exceeding the end face of the second connecting protrusion.

[0026] In a preferred embodiment, the outer peripheral wall of the first piston is provided with a first annular groove, a second annular groove and a third annular groove, wherein a magnetic ring is provided in the first annular groove, a first sealing gasket is provided in the second annular groove and a guide ring is provided in the third annular groove.

[0027] Compared with existing products, the cylinder is equipped with a guide rod assembly that passes through the first piston to limit its circumferential movement, thus effectively preventing the first piston from rotating under excessive external force. Attached Figure Description

[0028] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0029] Figure 1 This is one of the structural schematic diagrams of a cylinder disclosed herein;

[0030] Figure 2 This is the second schematic diagram of the structure of a cylinder disclosed herein;

[0031] Figure 3 This is one of the cross-sectional views of a cylinder disclosed herein;

[0032] Figure 4 This is a public announcement Figure 3 A magnified view of a section at point A in the middle;

[0033] Figure 5 This is a public announcement Figure 3 A magnified view of a section at point B in the middle;

[0034] Figure 6 This is the third schematic diagram of the structure of a cylinder disclosed herein;

[0035] Figure 7 This is a public announcement Figure 6 A magnified view of a section at point C;

[0036] Figure 8 This is a public announcement Figure 6 A magnified view of a section at point D;

[0037] Figure 9 This is a second cross-sectional view of a cylinder disclosed herein;

[0038] Figure 10 This is a public announcement Figure 9 A magnified view of a section at point E in the middle.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Cylinder block; 2. Front end cover; 3. Rear end cover; 4. First air inlet / outlet; 5. Second air inlet / outlet; 6. First guide rod; 7. Second guide rod; 8. Piston rod; 9. First piston; 10. First channel; 11. Second channel; 12. Third channel; 13. Fourth channel; 14. First connecting channel; 15. Second connecting channel; 16. First annular groove; 17. Second annular groove; 18. First connecting protrusion; 19. Second connecting protrusion; 20. Annular concave groove; 21. Third annular groove. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0042] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0043] Please refer to Figures 1-3 As shown, this application provides a cylinder, including: a cylinder body 1; an end cap assembly, the end cap assembly including a front end cap 2 and a rear end cap 3 disposed at both ends of the cylinder body 1, the front end cap 2 and the rear end cap 3 being connected to the cylinder body by flange, thread, or riveting respectively; a piston assembly, the piston assembly including a piston rod 8 and a first piston 9, the first piston 9 being disposed in the cylinder body 1, one end of the piston rod 8 passing through the front end cap 2, and the other end of the piston rod 8 being connected to the first piston 9; a guide rod assembly, the guide rod assembly being disposed in the cylinder body 1, the guide rod assembly passing through the first piston 9 for circumferentially limiting the first piston 9, thereby effectively preventing the first piston 9 from rotating under excessive external force.

[0044] Furthermore, the guide rod assembly includes a first guide rod 6, with a first end connected to the front end cover 2 and a second end connected to the rear end cover 3. Specifically, the front end cover 2 is provided with a first mounting groove, the rear end cover 3 is provided with a second mounting groove, the first end of the first guide rod 6 is located in the first mounting groove, and the second end of the first guide rod 6 is located in the second mounting groove.

[0045] Please continue reading. Figure 2 and Figure 3 As shown, to further limit the circumferential movement of the first piston 9, the guide rod assembly also includes a second guide rod 7. The first guide rod 6 and the second guide rod 7 are respectively arranged parallel to each other on both sides of the piston rod 8. The first guide rod 6 and the second guide rod 7 can be connected to the front end cover 2 and the rear end cover 3 by riveting, plugging, or threading. The first piston 9 is provided with a first limiting hole and a second limiting hole along its thickness direction. The first guide rod 6 passes through the first limiting hole, and the second guide rod 7 passes through the second limiting hole to prevent the first piston 9 from rotating when an excessive external rotational force is applied. Specifically, the front end cover 2 is provided with a third mounting groove, and the rear end cover 3 is provided with a fourth mounting groove. The first end of the second guide rod 7 is located in the third mounting groove, and the second end of the second guide rod 7 is located in the fourth mounting groove.

[0046] In one embodiment of this disclosure, a first airflow channel is provided at the first end of the first guide rod 6, a second airflow channel is provided at the second end of the first guide rod 6, a first air inlet / outlet 4 communicating with the first airflow channel is provided on the front end cover 2, and a second air inlet / outlet 5 communicating with the second airflow channel is provided on the rear end cover 3. The gas in the cylinder 1 flows to the first air inlet / outlet 4 through the first airflow channel or to the second air inlet / outlet 5 through the second airflow channel. The gas inside cylinder 1 first flows through the first airflow channel to the first inlet / outlet 4, and then exits through the first inlet / outlet 4; or it first flows through the second airflow channel to the second inlet / outlet 5, and then exits through the second inlet / outlet 5. The arrangement of the first and second airflow channels restricts the flow rate of gas entering the first inlet / outlet 4 and the second inlet / outlet 5, and delays the time it takes for gas to enter the first inlet / outlet 4 and the second inlet / outlet 5. Compared with the existing method where the gas in cylinder 1 exits directly from the first inlet / outlet 4 or the second inlet / outlet 5 without passing through the first or second airflow channel, the exhaust flow rate of the cylinder in this application is greatly reduced. The reduction in exhaust flow rate makes the first piston 9 move towards the front end cover 2 or the rear end cover 3. The significant resistance forces the first piston 9 to advance slowly toward the front cover 2 or the rear cover 3, making it difficult for it to collide with the front cover 2 or the rear cover 3 at high speed. This effectively reduces the impact of the first piston 9 on the front cover 2 or the rear cover 3 at high speed during cylinder operation. This application reduces the cylinder's exhaust flow rate by setting a first airflow channel and a second airflow channel. The reduced exhaust flow rate provides a buffer effect when the first piston 9 moves toward the front cover 2 or the rear cover 3. The first airflow channel and the second airflow channel in this application are reliable and can provide the first piston 9 with a long-term and effective buffer effect, preventing the first piston 9 from causing a large impact on the front cover 2 or the rear cover 3 and extending the service life of the cylinder.

[0047] Please refer to Figure 9 and Figure 10 As shown, it should be noted that the inner peripheral walls of the first and second limiting holes are respectively provided with two annular recesses 20. Sealing elements adapted to the shape of these annular recesses 20 are installed to enhance the seal between the first piston 9 and the first guide rod 6 and the second guide rod 7, preventing gas from flowing into the inlet / outlet port at the other end through the gap between the second guide rod 7 and the first piston 9 or the gap between the first guide rod 6 and the first piston 9. The specific structure and shape of the sealing elements are not limited here, as long as they serve a sealing function.

[0048] Please refer to the following: Figures 3-8As shown, the first airflow channel further includes a first channel 10 and a second channel 11 that are interconnected. The first channel 10 and the second channel 11 are arranged at an angle to each other, and the second channel 11 is connected to the first inlet / outlet 4. Specifically, the first channel 10 and the second channel 11 are perpendicular to each other. This arrangement causes the gas to take a detour when entering the second channel 11 from the first channel 10, thereby slowing down the gas flow rate. The first airflow channel also includes a third channel 12, which is connected to the first channel 10 and is arranged parallel to the second channel 11. The first channel 10 is located between the second channel 11 and the third channel 12. The gas enters through the third channel 12 and flows to the first inlet / outlet 4 through the second channel 11. A guide groove is provided on the side of the first guide rod 6, which is the third channel 12. A first through hole is provided at the bottom of the guide groove, which is the first channel 10. A second through hole is provided on the end face of the first guide rod 6 along its length, which is the second channel 11. The second channel 11 and the third channel 12 are parallel to the axial direction of the first guide rod 6, and the first channel 10 is perpendicular to the axial direction of the first guide rod 6.

[0049] Please continue reading. Figure 3As shown, further, the outer peripheral wall of the first piston 9 is provided with a first annular groove 16, a second annular groove 17, and a third annular groove 21. The first annular groove 16 is closer to the front end cover 2 than the second annular groove 17 and the third annular groove 21. The second annular groove 17 is located between the first annular groove 16 and the third annular groove 21. A magnetic ring is provided in the first annular groove 16, which is used to cooperate with a magnetic switch to output an action signal. A first sealing gasket is provided in the second annular groove 17. Specifically, the first sealing gasket is an O-ring. The first sealing gasket is provided to prevent gas from flowing into the other side chamber of the first piston 9 and to be discharged from the inlet / outlet port at the other end. A guide ring is provided in the third annular groove 21. The guide ring is used to guide the first piston 9 in the cylinder to ensure that it moves along the correct path. On the other hand, the guide ring also supports the first piston 9 and prevents the first piston 9 from directly contacting the cylinder body, reducing friction. In addition, the guide ring can also prevent direct metal-to-metal contact between the first piston 9 or piston rod 8 and the inner wall of the cylinder, thereby protecting other seals and maintaining the sealing performance of the cylinder. The guide groove is a groove structure on the side of the first guide rod 6. The first through hole is located at the end of the guide groove away from the front end cover 2. During the movement of the first piston 9 from the rear end cover 3 to the front end cover 2, before the first piston 9 reaches the position of the first channel 10, the gas directly enters the second channel 11 through the first channel 10. As the first piston 9 continues to move towards the front end cover 2, when the first piston 9 reaches the position of the first channel 10, the first piston 9 covers the inlet of the first channel 10. At this time, the gas can only enter the guide groove first, that is, the gas enters the first channel 10 through the third channel 12, and then enters the second channel 11, and then exits through the first inlet / outlet 4. At this time, when exhausting, the gas needs to take a more circuitous route (passing through the third channel 12, the first channel 10 and the second channel 11 in sequence), which slows down the gas flow rate. The first sealing gasket is set to prevent the gas from flowing into the other side chamber of the first piston 9 and exiting through the inlet / outlet at the other end. Understandably, when the first piston 9 moves to the position of the first channel 10, the distance between the first piston 9 and the front cover 2 is already very close. It is necessary to further reduce the air output to slow down the movement speed of the first piston 9 and prevent the first piston 9 from impacting the front cover 2 at a high speed. In addition, the buffer distance can be adjusted by adjusting the length of the second channel 11 and the third channel 12.

[0050] Please continue reading. Figures 3-5As shown, specifically, the first airflow channel also includes at least one fourth channel 13, which is connected to the second channel 11. The axis of the fourth channel 13 is on the same plane as the axis of the first channel 10, such that the fourth channel 13 and the first channel 10 are equidistant from the end face of the first guide rod 6. When the first piston 9 does not block the inlets of the fourth channel 13 and the first channel 10, gas can enter the second channel 11 not only through the first channel 10 but also through the fourth channel 13. The arrangement of the fourth channel 13 allows gas to enter the second channel 11 simultaneously from multiple channels. Thus, when the first piston 9 does not block the inlets of the fourth channel 13 and the first channel 10, the gas has a relatively large outflow rate, enabling the first piston 9 to move at a higher speed. Understandably, when the first piston 9 is not blocking the entrances of the fourth channel 13 and the first channel 10, there is a considerable distance between the first piston 9 and the front cover 2. In order to ensure the operating speed and power of the cylinder, the first piston 9 can move at a relatively high speed before blocking the entrances of the fourth channel 13 and the first channel 10, so that the first piston 9 runs relatively fast in the early stage. When the first piston 9 runs to the entrance position of the fourth channel 13 and the first channel 10, the distance between the first piston 9 and the front cover 2 is very close. At this time, the gas enters the first channel 10 through the third channel 12, then enters the second channel 11, and finally exits through the first inlet / outlet port 4. By reducing the amount of gas discharged, the movement speed of the first piston 9 is slowed down, so as to avoid the first piston 9 impacting the front cover 2 at a high speed.

[0051] It should be noted that the structure of the second airflow channel is the same as that of the first airflow channel, and will not be described in detail here. The setting of the second airflow channel allows the movement speed of the first piston 9 to be buffered when the gas is discharged from the second inlet / outlet 5, so as to prevent the first piston 9 from impacting the rear end cover 3.

[0052] Specifically, the front cover 2 and the rear cover 3 are respectively provided with connecting channels. The first airflow channel is connected to the first inlet / outlet 4 through the connecting channel on the front cover 2, and the second airflow channel is connected to the second inlet / outlet 5 through the connecting channel on the rear cover 3. More specifically, the connecting channels include a first connecting channel 14 and a second connecting channel 15 that are interconnected. The first connecting channel 14 and the second connecting channel 15 are perpendicular to each other. The first connecting channel 14 is connected to either the first inlet / outlet 4 or the second inlet / outlet 5, and the second connecting channel 15 is connected to the second channel 11. The perpendicular arrangement of the first connecting channel 14 and the second connecting channel 15 further reduces the flow rate during gas exhaust. The inner diameter of the first channel 10 is smaller than the inner diameter of the second channel 11; the inner diameter of the connecting channel is smaller than the inner diameter of the second channel 11. Since the gas can enter the second channel 11 from the first channel 10 and the fourth channel 13 respectively, the inner diameter of the second channel 11 is set to be larger to facilitate the flow of gas. In order to prevent the gas flow rate from being too fast when it is exhausted and thus failing to achieve the buffering effect, the first connecting channel 14 and the second connecting channel 15 are set vertically, and the inner diameters of the first connecting channel 14 and the second connecting channel 15 are both smaller than that of the second channel 11.

[0053] like Figure 6 As shown, to further prevent the first piston 9 from directly impacting the front cover 2 or the rear cover 3, the front cover 2 is provided with a first connecting protrusion 18. A first sealing ring is provided between the outer peripheral wall of the first connecting protrusion 18 and the inner peripheral wall of the cylinder 1, and the height of the first sealing ring exceeds the end face of the first connecting protrusion 18. The rear cover 3 is provided with a second connecting protrusion 19. A second sealing ring is provided between the outer peripheral wall of the second connecting protrusion 19 and the inner peripheral wall of the cylinder 1, and the height of the second sealing ring exceeds the end face of the second connecting protrusion 19. Since the height of the first sealing ring exceeds the end face of the first connecting protrusion 18 and the height of the second sealing ring exceeds the end face of the second connecting protrusion 19, when the first piston 9 is in position, it will only hit the higher of the first or second sealing rings, preventing direct contact between the first piston 9 and the front cover 2 or the rear cover 3. This effectively avoids impact between the first piston 9 and the front cover 2 and the rear cover 3, and also reduces noise. The cylinder of this application has a good buffering effect and is suitable for vacuum valves (slot valves) with high operating speed, so as to extend the service life of the vacuum valve and reduce the maintenance frequency.

[0054] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A cylinder, characterized in that, include: Cylinder block (1); End cap assembly, the end cap assembly including a front end cap (2) and a rear end cap (3) disposed at both ends of the cylinder body (1); The piston assembly includes a piston rod (8) and a first piston (9), the first piston (9) being disposed in the cylinder (1), one end of the piston rod (8) passing through the front end cover (2), and the other end of the piston rod (8) being connected to the first piston (9); A guide rod assembly is disposed inside the cylinder (1) and passes through the first piston (9) to limit the circumferential movement of the first piston (9).

2. The cylinder according to claim 1, characterized in that, The guide rod assembly includes a first guide rod (6), the first end of which is connected to the front end cover (2), and the second end of which is connected to the rear end cover (3).

3. The cylinder according to claim 2, characterized in that, The front end cover (2) is provided with a first mounting groove, the rear end cover (3) is provided with a second mounting groove, the first end of the first guide rod (6) is provided in the first mounting groove, and the second end of the first guide rod (6) is provided in the second mounting groove.

4. The cylinder according to claim 2, characterized in that, The guide rod assembly further includes a second guide rod (7). The first guide rod (6) and the second guide rod (7) are respectively arranged parallel to each other on both sides of the piston rod (8). The first piston (9) is provided with a first limiting hole and a second limiting hole along its thickness direction. The first guide rod (6) passes through the first limiting hole, and the second guide rod (7) passes through the second limiting hole.

5. The cylinder according to claim 4, characterized in that, The inner peripheral walls of the first limiting hole and the second limiting hole are respectively provided with at least two annular recesses (20), and the annular recesses (20) are provided with sealing elements adapted to their shapes.

6. The cylinder according to claim 4, characterized in that, The front cover (2) is provided with a third mounting groove, the rear cover (3) is provided with a fourth mounting groove, the first end of the second guide rod (7) is located in the third mounting groove, and the second end of the second guide rod (7) is located in the fourth mounting groove.

7. The cylinder according to claim 2, characterized in that, The first end of the first guide rod (6) is provided with a first airflow channel, the second end of the first guide rod (6) is provided with a second airflow channel, the front end cover (2) is provided with a first inlet / outlet (4) communicating with the first airflow channel, and the rear end cover (3) is provided with a second inlet / outlet (5) communicating with the second airflow channel. The gas in the cylinder (1) flows to the first inlet / outlet (4) through the first airflow channel or to the second inlet / outlet (5) through the second airflow channel.

8. The cylinder according to claim 7, characterized in that, The first airflow channel includes a first channel (10) and a second channel (11) that are interconnected. The first channel (10) and the second channel (11) are arranged at an angle to each other. The second channel (11) is connected to the first air inlet / outlet (4).

9. The cylinder according to claim 8, characterized in that, The first airflow channel also includes a third channel (12), which is connected to the first channel (10). The first channel (10) is located between the second channel (11) and the third channel (12). Gas enters through the third channel (12) and flows through the second channel (11) to the first inlet / outlet (4).

10. The cylinder according to claim 9, characterized in that, The first guide rod (6) has a flow channel on its side, which is a third channel (12); the bottom of the flow channel has a first through hole, which is a first channel (10); the end face of the first guide rod (6) has a second through hole along its length, which is a second channel (11).

11. The cylinder according to claim 7, characterized in that, The front cover (2) and the rear cover (3) are respectively provided with connecting channels. The first airflow channel is connected to the first air inlet / outlet (4) through the connecting channel on the front cover (2), and the second airflow channel is connected to the second air inlet / outlet (5) through the connecting channel on the rear cover (3).

12. The cylinder according to claim 11, characterized in that, The connection channel includes a first connection channel (14) and a second connection channel (15) that are interconnected. The first connection channel (14) and the second connection channel (15) are perpendicular to each other. The first connection channel (14) is connected to the first air inlet / outlet (4), and the second connection channel (15) is connected to the second channel (11).

13. The cylinder according to claim 9, characterized in that, The first airflow channel also includes at least one fourth channel (13), which is connected to the second channel (11), and the axis of the fourth channel (13) is on the same plane as the axis of the first channel (10).

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