阅读说明：本技术 一种气弹簧阀门气缸 (Air cylinder of air spring valve ) 是由 滕磊军 王涛 张振旭 孙拥军 尹奇志 田富竟 高荣 于 2021-05-20 设计创作，主要内容包括：一种气弹簧阀门气缸,包括缸体,缸体内设置有阀门开启腔和阀门关闭腔,缸体内远离阀门关闭腔的一端设有与阀门开启腔连通的气弹簧腔；或者,缸体内远离阀门开启腔的一端设有与阀门关闭腔连通的气弹簧腔。本发明中通过在缸体内设置与阀门开启腔或阀门关闭腔连通的气弹簧腔,使装置无需在阀门内或气缸内增加机械弹簧,就能在整个系统出现紧急断电断气的情况下,阀门在自身机构的作用下保持开启或保持关闭。(A gas spring valve cylinder comprises a cylinder body, wherein a valve opening cavity and a valve closing cavity are arranged in the cylinder body, and a gas spring cavity communicated with the valve opening cavity is arranged at one end, far away from the valve closing cavity, in the cylinder body; or, an air spring cavity communicated with the valve closing cavity is arranged at one end, far away from the valve opening cavity, in the cylinder body. According to the invention, the gas spring cavity communicated with the valve opening cavity or the valve closing cavity is arranged in the cylinder body, so that the valve can be kept open or closed under the action of the mechanism of the valve without adding a mechanical spring in the valve or the cylinder under the condition that the whole system is in emergency power-off and gas-off.)

1. A gas spring valve cylinder comprises a cylinder body (1), wherein a valve opening cavity (7) and a valve closing cavity (8) are arranged in the cylinder body (1), and is characterized in that a gas spring cavity (9) communicated with the valve opening cavity (7) is arranged at one end, far away from the valve closing cavity (8), in the cylinder body (1);

or, an air spring cavity (9) communicated with the valve closing cavity (8) is arranged at one end, far away from the valve opening cavity (7), in the cylinder body (1).

2. A gas spring valve cylinder according to claim 1, characterized in that the inner wall of the cylinder body (1) is provided with a ring of inwardly projecting guide cylinders (2), which guide cylinders (2) separate the valve opening chamber (7) or the valve closing chamber (8) from the gas spring chamber (9).

3. A gas spring valve cylinder according to claim 2, characterized in that the valve opening chamber (7) or the valve closing chamber (8) communicates with the gas spring chamber (9) through a one-way valve (3) extending through the guide cylinder (2); the outlet end of the one-way valve (3) faces the gas spring cavity (9).

4. A gas spring valve cylinder according to any one of claims 1 to 3, characterized in that both ends of the cylinder body (1) are provided with cylinder covers, and the cylinder covers and the guide cylinder (2) are respectively provided with a gas spring test port (12), a cylinder closing port (11) and a cylinder opening port (10) which are sequentially communicated with the gas spring cavity (9), the valve closing cavity (8) and the valve opening cavity (7).

5. A gas spring valve cylinder according to claim 4, characterized in that a piston base body (6) is provided in the cylinder body (1), the radial pressure effective area of the piston base body (6) in the gas spring chamber (9) being smaller than its radial pressure effective area in the valve closing chamber (8).

6. A gas spring valve cylinder according to claim 5, characterized in that the piston base body (6) includes a first portion (61), a second portion (62) and a third portion (63), the first portion (61), the second portion (62) and the third portion (63) being of successively decreasing diameter; the valve opening chamber (7) and the valve closing chamber (8) are respectively arranged on both sides of the first part (61).

7. A gas spring valve cylinder according to claim 6, characterized in that the first (61) and second (62) portions of the piston base body (6) are disposed in the cylinder body (1) to cooperate with the inner wall of the cylinder body (1) and the inner wall of the guide cylinder (2), respectively, and the third portion (63) cooperates with the cylinder head.

8. A gas spring valve cylinder according to claim 7, characterized in that the first portion (61) of the piston base body (6) is arranged at the innermost end of the cylinder body (1), the second portion (62) is arranged in the middle of the cylinder body (1), and the third portion (63) is arranged at the outermost end of the cylinder body (1) and at least partly extendable out of the cylinder body (1);

or the second part (62) of the piston base body (6) is arranged at the innermost end of the cylinder body (1), the first part (61) is arranged in the middle of the cylinder body (1), and the third part (63) is arranged at the outermost end of the cylinder body (1) and at least partially can extend out of the cylinder body (1).

9. A gas spring valve cylinder according to claim 7 or 8, characterized in that the cylinder cover comprises a first cylinder cover (4) and a second cylinder cover (5), the second cylinder cover (5) being provided with a through hole in the middle thereof for cooperation with the third portion (63) of the piston base body (6);

a piston sleeve (13) is arranged between the second cylinder cover (5) and the piston base body (6), the piston base body (6) is matched with the piston sleeve (13), and an oil seal (16) is arranged between the piston sleeve (13) and the second cylinder cover (5).

10. The gas spring valve cylinder according to claim 9, characterized in that a first O-ring (151) is provided between the first cylinder cover (4) and the guide rod (14), a second O-ring (152) is provided between the piston base body (6) and the guide rod (14), a third O-ring (153) is provided between the guide cylinder (2) and the piston base body (6), a fourth O-ring (154) is provided between the piston base body (6) and the inner wall of the cylinder body (1), a fifth O-ring (155) is provided between the piston sleeve (13) and the piston base body (6), a sixth O-ring (156) is provided between the piston sleeve (13) and the second cylinder cover (5), a seventh O-ring is provided between the cylinder body (1) and the first cylinder cover (4), an eighth O-ring is provided between the cylinder body (1) and the second cylinder cover (5), and a ninth O-ring is provided between the check valve (3) and the guide cylinder (2).

Technical Field

The invention relates to the technical field of pneumatic valves, in particular to a gas spring valve cylinder.

Background

The release valve is applied to the field of air pressure and comprises a normally-open valve and a normally-closed valve, wherein the normally-closed valve is in a cut-off state under the action of external force during normal use and is switched on under the action of external force, and the normally-open valve is in a switched-on state under the action of external force during normal use and is cut off under the action of external force.

At present, many pneumatic valves need to be kept in a normally closed state or a normally open state in a process system, that is, in the case of emergency power failure and air cut-off of the whole system, the valves can still be kept closed or kept open under the action of their own mechanisms, and a common practice is to add a mechanical spring in the valve or a control mechanism (cylinder).

However, when the valve needs to be kept in a normally closed state, because the sealing force required by the large-diameter valve and the high-pressure valve is large, the force of the mechanical spring is increased, the volume and the weight of the mechanical spring are increased, and even under the condition of some force, the spring cannot be processed (when the stainless steel spring is used for low temperature). In addition, when the valve needs to be kept in a normally open state, the valve opening stroke is large sometimes, and the spring is long. Namely, the requirement on the spring for keeping the normally closed state or the normally open state is higher, and the using effect and the practicability are poorer.

Therefore, how to develop a gas spring valve cylinder which can realize the normally open or normally closed of the valve without arranging a mechanical spring in the valve body becomes a problem to be solved urgently by workers in the field.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a gas spring valve cylinder, wherein a gas spring structure is arranged in a cylinder body, so that the problems are solved.

In order to solve the technical problems, the invention adopts the following technical scheme:

a gas spring valve cylinder comprises a cylinder body, wherein a valve opening cavity and a valve closing cavity are arranged in the cylinder body, and a gas spring cavity communicated with the valve opening cavity is arranged at one end, far away from the valve closing cavity, in the cylinder body; or, an air spring cavity communicated with the valve closing cavity is arranged at one end, far away from the valve opening cavity, in the cylinder body.

Furthermore, a circle of guide cylinders protruding inwards are arranged on the inner wall of the cylinder body, and the guide cylinders separate the valve opening cavity or the valve closing cavity from the gas spring cavity.

Further, the valve opening cavity or the valve closing cavity is communicated with the gas spring cavity through a one-way valve penetrating through the guide cylinder; the outlet end of the one-way valve faces the gas spring cavity.

Further, cylinder covers are arranged at two ends of the cylinder body, and a gas spring experiment port, a cylinder closing port and a cylinder opening port which are sequentially communicated with the gas spring cavity, the valve closing cavity and the valve opening cavity are respectively arranged on the cylinder covers and the guide cylinder.

Further, a piston base body is arranged in the cylinder body, and the radial compression effective area of the piston base body in the gas spring cavity is smaller than that of the piston base body in the valve closing cavity.

Further, the piston base body comprises a first portion, a second portion and a third portion, wherein the diameters of the first portion, the second portion and the third portion are reduced in sequence; the valve opening cavity and the valve closing cavity are respectively arranged on two sides of the first part.

Further, the first portion and the second portion of the piston base body are arranged in the cylinder body and are matched with the inner wall of the cylinder body and the inner wall of the guide cylinder respectively, and the third portion of the piston base body is matched with the cylinder cover.

Further, the first part of the piston base body is arranged at the innermost end of the cylinder body, the second part of the piston base body is arranged in the middle of the cylinder body, and the third part of the piston base body is arranged at the outermost end of the cylinder body and at least part of the piston base body can extend out of the cylinder body;

or the second part of the piston base body is arranged at the innermost end of the cylinder body, the first part is arranged in the middle of the cylinder body, and the third part is arranged at the outermost end of the cylinder body and at least partially can extend out of the cylinder body.

The cylinder cover comprises a first cylinder cover and a second cylinder cover, and the middle part of the second cylinder cover is provided with a through hole matched with the third part of the piston base body;

a piston sleeve is arranged between the second cylinder cover and the piston base body, the piston base body is matched with the piston sleeve, and an oil seal is arranged between the piston sleeve and the second cylinder cover.

Furthermore, a first O-shaped ring is arranged between the first cylinder cover and the guide rod, a second O-shaped ring is arranged between the piston base body and the guide rod, a third O-shaped ring is arranged between the guide cylinder and the piston base body, a fourth O-shaped ring is arranged between the piston base body and the inner wall of the cylinder body, a fifth O-shaped ring is arranged between the piston sleeve and the piston base body, a sixth O-shaped ring is arranged between the piston sleeve and the second cylinder cover, a seventh O-shaped ring is arranged between the cylinder body and the first cylinder cover, an eighth O-shaped ring is arranged between the cylinder body and the second cylinder cover, and a ninth O-shaped ring is arranged between the check valve and the guide cylinder.

Compared with the prior art, the invention has the beneficial technical effects that:

according to the invention, the gas spring cavity is arranged in the cylinder body, the control gas in the gas spring cavity acts on the piston base body, and the device can keep the valve open or closed under the action of the self mechanism under the condition that the whole system is in emergency power-off and gas-off without adding a mechanical spring in the valve or the control mechanism (cylinder). Meanwhile, the one-way valve is arranged on the guide cylinder, the controller in the valve opening cavity or the valve closing cavity flows into the gas spring cavity to inflate the gas spring cavity, a control gas structure does not need to be additionally arranged, meanwhile, backflow of the controller is avoided, and the structure of the device is simplified. In addition, the air cylinder of the air spring valve has the advantages that the sealing effect of the cylinder body is good, the vacuum degree is high and the working efficiency is improved by arranging the O-shaped rings.

Meanwhile, the invention has simple structure and obvious effect and is suitable for popularization and use.

Drawings

The invention is further illustrated by the following description in conjunction with the accompanying drawings:

FIG. 1 is a schematic structural view of a normally open gas spring valve cylinder according to the present invention;

FIG. 2 is a schematic structural view of a normally closed gas spring valve cylinder according to the present invention;

fig. 3 is a schematic view of the piston sleeve assembly structure of the present invention.

Description of reference numerals: 1. a cylinder body; 2. a guide cylinder; 3. a one-way valve; 4. a first cylinder head; 5. a second cylinder head; 6. a piston base; 61. a first portion; 62. a second portion; 63. a third portion; 7. a valve opening chamber; 8. a valve-closing chamber; 9. a gas spring cavity; 10. an opening of the cylinder; 11. a cylinder closing port; 12. a gas spring test port; 13. a piston sleeve; 14. a guide bar; 151. a first O-ring; 152. a second O-ring; 153. a third O-ring; 154. a fourth O-ring; 155. a fifth O-ring; 156. a sixth O-ring; 16. and (7) oil sealing.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and therefore should not be construed as limiting the present invention, and those skilled in the art can understand the specific meaning of the above terms in the present invention in a specific case. Furthermore, the terms "upper", "lower", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be described in further detail with reference to examples.

As shown in fig. 1 to 3, in the embodiment of the present invention, a gas spring valve cylinder is introduced, which includes a cylinder body 1, the interior of the cylinder body 1 is a hollow structure, two ends of the cylinder body 1 are respectively provided with a cylinder cover, the cylinder covers are fixed at two ends of the cylinder body 1 through bolts, and a seventh O-ring and an eighth O-ring are arranged between the cylinder cover and the cylinder body 1, so as to ensure a sealing effect of an internal space of the cylinder body 1.

A circle of guide cylinder 2 protruding inwards is arranged on the inner wall of the cylinder body 1, the guide cylinder 2 is coaxial with the cylinder body 1, and the guide cylinder 2 and the cylinder body 1 are of an integrally formed structure. Be provided with piston base member 6 in the cylinder body 1, piston base member 6 one end is inside cylinder body 1 all the time, and the other end part can stretch out cylinder body 1 at least, and piston base member 6 cooperatees with 1 inner wall of cylinder body, 2 inner walls of guide cylinder and cylinder cap respectively, and the part that piston base member 6 stretches out cylinder body 1 is used for the switching of control flap.

As shown in fig. 3, in the embodiment of the present invention, a piston sleeve 13 is disposed between the cylinder cover and the piston base 6, the piston base 6 is engaged with the piston sleeve 13, and an oil seal 16 is disposed between the piston sleeve 13 and the cylinder cover.

In the embodiment of the invention, a third O-ring 153 is arranged between the guide cylinder 2 and the piston base body 6, a fourth O-ring 154 is arranged between the piston base body 6 and the inner wall of the cylinder body 1, a fifth O-ring 155 is arranged between the piston sleeve 13 and the piston base body 6, and a sixth O-ring 156 is arranged between the piston sleeve 13 and the cylinder cover. By arranging a plurality of layers of the third O-ring 153, the fourth O-ring 154, the fifth O-ring 155 and the sixth O-ring 156, all chambers in the cylinder body 1 can be kept sealed, and the air tightness of the device is enhanced.

In the embodiment of the invention, the guide cylinder 2 divides the interior of the cylinder body 1 into a gas spring cavity 9, and the piston base body 6 divides the part between the cylinder cover and the guide cylinder 2 into a valve closing cavity 8 and a valve opening cavity 7. The cylinder cover and the guide cylinder 2 are respectively provided with a gas spring experimental port, a cylinder closing port 11 and a cylinder opening port 10 which are sequentially communicated with a gas spring cavity 9, a valve closing cavity 8 and a valve opening cavity 7. The cylinder closing port 11 and the cylinder opening port 10 are respectively connected with control gas, the guide cylinder 2 is provided with a one-way valve 3 which axially penetrates through the guide cylinder 2, the outlet of the one-way valve 3 faces the gas spring cavity 9, and a controller in the valve closing cavity 8 or the valve opening cavity 7 can be led into the gas spring cavity 9 to inflate the gas spring cavity 9. When the system is in emergency power-off and gas-off conditions, part of control gas can be reserved in the gas spring cavity 9, and the piston base body 6 is kept normally open or normally closed under the action of the control gas. Through set up air spring chamber 9 in cylinder body 1, the control gas in the air spring chamber 9 is used in on piston base member 6, and the device need not to increase mechanical spring in the valve or in the control mechanism (cylinder), just can make the valve keep closing or keep opening under the effect of self mechanism under the circumstances that the whole system appears emergency power failure and ends gas.

In the embodiment of the invention, a plurality of ninth O-shaped rings are arranged between the one-way valve 3 and the guide cylinder 2, so that the air tightness of the air spring cavity 9 is ensured, and the air leakage of the air spring cavity 9 is prevented from damaging the normally open or normally closed state of the valve.

Example one

As shown in fig. 1 and 3, in the embodiment of the present invention, a gas spring valve cylinder is introduced, which includes a cylinder body 1, the interior of the cylinder body 1 is a hollow structure, two ends of the cylinder body 1 are respectively provided with a cylinder cover, the cylinder covers are fixed at two ends of the cylinder body 1 through bolts, the cylinder covers include a first cylinder cover 4 and a second cylinder cover 5, and a through hole matching with a third portion 63 of a piston base 6 is formed in the middle of the second cylinder cover 5.

Preferably, in this embodiment, a seventh O-ring is disposed between the cylinder body 1 and the first cylinder cover 4, and an eighth O-ring is disposed between the cylinder body 1 and the second cylinder cover 5, so as to ensure a sealing effect of an inner space of the cylinder body 1.

In this embodiment, a circle of guide cylinder 2 protruding inwards is arranged on the inner wall of the cylinder body 1, the guide cylinder 2 is coaxial with the cylinder body 1, and the guide cylinder 2 and the cylinder body 1 are of an integrally formed structure. Be provided with piston base member 6 in the cylinder body 1, piston base member 6 one end is inside cylinder body 1 all the time, and the other end part can stretch out cylinder body 1 at least, and piston base member 6 cooperatees with 1 inner wall of cylinder body, 2 inner walls of guide cylinder and cylinder cap respectively, and the part that piston base member 6 stretches out cylinder body 1 is used for the switching of control flap.

Preferably, in the embodiment of the present invention, a piston sleeve 13 is disposed between the cylinder cover and the piston base 6, the piston base 6 is matched with the piston sleeve 13, and an oil seal 16 is disposed between the piston sleeve 13 and the second cylinder cover 5.

In the present embodiment, the piston base body 6 includes a first portion 61, a second portion 62, and a third portion 63, and the first portion 61, the second portion 62, and the third portion 63 are sequentially reduced in diameter.

In this embodiment, the first portion 61 of the piston base 6 is disposed at the innermost end of the cylinder 1 to engage with the inner wall of the cylinder 1, the second portion 62 engages with the inner wall of the guide cylinder 2 at the middle portion of the piston base 6, the third portion 63 may extend out of the cylinder 1, and the third portion 63 engages with the second cylinder cover 5.

The piston base body 6 is matched with the cylinder body 1, the guide cylinder 2 and the cylinder cover to separate the inner space of the cylinder body 1 into three chambers, namely a valve closing chamber 8, a valve opening chamber 7 and a gas spring chamber 9 from inside to outside in sequence. Be provided with on the guide cylinder 2 along the axial check valve 3 that runs through guide cylinder 2, open through check valve 3 intercommunication between chamber 7 and the air spring chamber 9 for the valve, the opening of check valve 3 is arranged towards air spring chamber 9.

In the embodiment of the invention, the first cylinder cover 4 is provided with a cylinder closing port 11 communicated with the valve closing cavity 8, the guide cylinder 2 is provided with a cylinder opening port 10 communicated with the valve opening cavity 7, the second cylinder cover 5 is provided with a gas spring test port 12 communicated with the gas spring cavity 9, and the opening and closing of the valve are controlled by respectively introducing a control gas pipeline into the cylinder opening port 10 and the cylinder closing port 11. Control gas enters the valve opening cavity 7 through the cylinder opening 10, and the control gas in the valve opening cavity 7 can enter the gas spring cavity 9 through the one-way valve 3. In this embodiment, the gas spring test port 12 is used for releasing pressure for the gas spring cavity 9, and the gas spring test port 12 is always kept closed in the normal use process.

In the embodiment, when the piston base body 6 moves to the innermost end of the cylinder body 1, the interface of the second part 62 and the third part 63 is flush with the side surface of the guide cylinder 2 close to the gas spring cavity 9, and the first part 61 is always matched with the piston sleeve 13; the interface of the second portion 62 with the third portion 63 coincides with the inner end surface of the second cylinder head 5 when the piston base 6 moves to the outermost end of the cylinder 1.

Preferably, in the present exemplary embodiment, the radially effective pressure surface of the piston base body 6 in the gas spring chamber 9 is smaller than the radially effective pressure surface thereof in the valve closing chamber 8. So that the control gas in the gas spring chamber 9 does not affect the normal closing of the valve.

According to the invention, the gas spring cavity 9 is arranged in the cylinder body 1, the control gas in the gas spring cavity 9 acts on the piston base body 6, and radial pressure is applied to the piston base body 6, so that when the system is in an emergency power-off and gas-off condition, part of the control gas can be reserved in the gas spring cavity 9, and the piston base body 6 is kept in a normally open state under the action of the control gas. The device can keep the valve open under the action of the mechanism without adding a mechanical spring in the valve or a control mechanism (cylinder) under the condition of emergency power failure and gas cut-off of the whole system.

Preferably, in this embodiment, a guide rod 14 is disposed at one end of the cylinder body 1, the guide rod 14 penetrates through the first cylinder head 4, one end of the guide rod 14 extends into the cylinder body 1, and the other end is fixed outside the first cylinder head 4 by a bolt. The guide rod 14 and the cylinder body 1 are coaxially arranged, and at least part of the piston base body 6 is always sleeved on the guide rod 14, so that the smoothness of the movement of the piston base body 6 is enhanced.

Preferably, in the embodiment of the present invention, a first O-ring 151 is disposed between the first cylinder head 4 and the guide rod 14, a second O-ring 152 is disposed between the piston base body 6 and the guide rod 14, a third O-ring 153 is disposed between the guide cylinder 2 and the piston base body 6, a fourth O-ring 154 is disposed between the piston base body 6 and the inner wall of the cylinder body 1, a fifth O-ring 155 is disposed between the piston sleeve 13 and the piston base body 6, a sixth O-ring 156 is disposed between the piston sleeve 13 and the second cylinder head 5, and a ninth O-ring is disposed between the check valve 3 and the guide cylinder 2. Through setting up a plurality of layers above-mentioned O type circle, make each cavity in the cylinder body 1 can both keep sealed, reinforcing device's gas tightness.

Example two

As shown in fig. 1 and 3, in the embodiment of the present invention, a gas spring valve cylinder is introduced, which includes a cylinder body 1, the interior of the cylinder body 1 is a hollow structure, two ends of the cylinder body 1 are respectively provided with a cylinder cover, the cylinder covers are fixed at two ends of the cylinder body 1 through bolts, the cylinder covers include a first cylinder cover 4 and a second cylinder cover 5, and a through hole matching with a third portion 63 of a piston base 6 is formed in the middle of the second cylinder cover 5.

Preferably, in this embodiment, a seventh O-ring is disposed between the cylinder body 1 and the first cylinder cover 4, and an eighth O-ring is disposed between the cylinder body 1 and the second cylinder cover 5, so as to ensure a sealing effect of an inner space of the cylinder body 1.

In this embodiment, a circle of guide cylinder 2 protruding inwards is arranged on the inner wall of the cylinder body 1, the guide cylinder 2 is coaxial with the cylinder body 1, and the guide cylinder 2 and the cylinder body 1 are of an integrally formed structure. Be provided with piston base member 6 in the cylinder body 1, piston base member 6 one end is inside cylinder body 1 all the time, and the other end part can stretch out cylinder body 1 at least, and piston base member 6 cooperatees with 1 inner wall of cylinder body, 2 inner walls of guide cylinder and cylinder cap respectively, and the part that piston base member 6 stretches out cylinder body 1 is used for the switching of control flap.

Preferably, in the embodiment of the present invention, a piston sleeve 13 is disposed between the cylinder cover and the piston base 6, the piston base 6 is matched with the piston sleeve 13, and an oil seal 16 is disposed between the piston sleeve 13 and the second cylinder cover 5.

In the present embodiment, the piston base body 6 includes a first portion 61, a second portion 62, and a third portion 63, and the first portion 61, the second portion 62, and the third portion 63 are sequentially reduced in diameter.

In this embodiment, the second portion 62 of the piston base 6 is arranged at the innermost end of the cylinder 1 and is matched with the inner wall of the guide cylinder 2, the middle part of the piston base 6 is matched with the inner wall of the cylinder 1, the third portion 63 can extend out of the cylinder 1, and the third portion 63 is matched with the second cylinder cover 5.

The piston base body 6 is matched with the cylinder body 1, the guide cylinder 2 and the cylinder cover, the internal space of the cylinder body 1 is separated into three chambers, and the three chambers are an air spring chamber 9, a valve closing chamber 8 and a valve opening chamber 7 from inside to outside in sequence. Be provided with on the guide cylinder 2 along the axial through guide cylinder 2's check valve 3, through check valve 3 intercommunication between valve closing chamber 8 and the air spring chamber 9, the opening of check valve 3 is arranged towards air spring chamber 9.

In the embodiment of the invention, the first cylinder cover 4 is provided with a gas spring test port 12 communicated with a gas spring cavity 9, the guide cylinder 2 is provided with a cylinder closing port 11 communicated with a valve closing cavity 8, the second cylinder cover 5 is provided with a cylinder opening port 10 communicated with a valve opening cavity 7, and the opening and closing of the valve are controlled by respectively introducing control gas pipelines into the cylinder opening port 10 and the cylinder closing port 11. Control gas enters the valve closing cavity 8 through the cylinder closing port 11, and the control gas in the valve closing cavity 8 can enter the gas spring cavity 9 through the check valve 3. In this embodiment, the gas spring test port 12 is used for releasing pressure for the gas spring cavity 9, and the gas spring test port 12 is always kept closed in the normal use process.

In this embodiment, when the piston base 6 moves to the innermost end of the cylinder block 1, the end surface of the second portion 62 away from the first portion 61 coincides with the inner side wall of the first cylinder head 4, and the first portion 61 is always engaged with the piston sleeve 13. When the piston base body 6 moves to the outermost end of the cylinder 1, the end face of the second portion 62 remote from the first portion 61 is flush with the side wall of the guide cylinder 2 on the side near its spring chamber.

Preferably, in the present embodiment, the radially compressed effective area of the piston base body 6 in the gas spring chamber 9 is smaller than the radially compressed effective area thereof in the valve opening chamber 7. So that the control gas in the gas spring chamber 9 does not affect the normal opening of the valve.

According to the invention, the gas spring cavity 9 is arranged in the cylinder body 1, the control gas in the gas spring cavity 9 acts on the piston base body 6, and radial pressure is applied to the piston base body 6, so that when the system is in an emergency power-off and gas-off condition, part of the control gas can be reserved in the gas spring cavity 9, and the piston base body 6 is kept in a normally closed state under the action of the control gas. The device can keep the valve closed under the action of the self mechanism under the condition that the whole system is in emergency power-off and gas-off without adding a mechanical spring in the valve or a control mechanism (cylinder).

Preferably, in this embodiment, a guide rod 14 is disposed at one end of the cylinder body 1, the guide rod 14 penetrates through the first cylinder head 4, one end of the guide rod 14 extends into the cylinder body 1, and the other end is fixed outside the first cylinder head 4 by a bolt. The guide rod 14 and the cylinder body 1 are coaxially arranged, and at least part of the piston base body 6 is always sleeved on the guide rod 14, so that the smoothness of the movement of the piston base body 6 is enhanced.

Preferably, in the embodiment of the present invention, a first O-ring 151 is disposed between the first cylinder head 4 and the guide rod 14, a second O-ring 152 is disposed between the piston base body 6 and the guide rod 14, a third O-ring 153 is disposed between the guide cylinder 2 and the piston base body 6, a fourth O-ring 154 is disposed between the piston base body 6 and the inner wall of the cylinder body 1, a fifth O-ring 155 is disposed between the piston sleeve 13 and the piston base body 6, a sixth O-ring 156 is disposed between the piston sleeve 13 and the second cylinder head 5, and a ninth O-ring is disposed between the check valve 3 and the guide cylinder 2. Through setting up a plurality of layers above-mentioned O type circle, make each cavity in the cylinder body 1 can both keep sealed, reinforcing device's gas tightness.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.