Single-action pneumatic actuator for regulating valve

Abstract

The embodiment of the utility model provides a single-action pneumatic actuator for a regulating valve, which is characterized in that the single-action pneumatic actuator comprises an air supply device, an air cylinder, a piston and a spring, the piston is arranged in the air cylinder and divides the air cylinder into a first cavity and a second cavity, and a first air hole is formed in the first cavity; a second air hole is formed in the second cavity; the spring is arranged in the first cavity, and the spring is connected with the inner wall of the first cavity and the piston; the piston is used for being connected with a regulating valve; the air supply device communicates with the first air hole and the second air hole and is used for outputting air into the first cavity and the second cavity so as to drive the piston to move. According to the single-action pneumatic actuator, the problems that in the using process of an existing single-action pneumatic actuator, multiple times of position adjustment are needed, time is wasted, and the service life of an adjusting valve is affected are solved.

Description

Technical Field

[0001] The present application belongs to the technical field of regulating valves, and in particular relates to a single-acting pneumatic actuator for regulating valves. Background Art

[0002] With the development of science and technology, pneumatic actuators have become an important control device for regulating valves in production, and are widely used in the control of various media in the production processes of chemical, petroleum, natural gas, etc., such as liquid, gas, steam, etc. The existing single-acting pneumatic actuator valve generally drives the piston of the pneumatic actuator valve to move and deform the spring by inputting gas. When the regulating valve connected to the piston moves to the desired position, the pressure of the input gas and the elastic force of the spring reach a balanced state, so that the regulating valve is in the desired position to play a regulating role.

[0003] However, during the adjustment process of the single-acting pneumatic actuator in the prior art, the pressure of the input gas and the spring force cannot quickly achieve force balance. If the air supply force is too large or too small, the piston cannot be in the accurate position. Multiple position adjustments are often required during use, which wastes time and affects the service life of the regulating valve. Utility Model Content

[0004] The present application aims to provide a single-acting pneumatic actuator for a regulating valve, so as to solve the problem that the existing pneumatic actuator needs to be adjusted multiple times during use, which wastes time and affects the service life of the regulating valve.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The present application discloses a single-acting pneumatic actuator for a regulating valve, characterized in that the single-acting pneumatic actuator comprises: an air supply device, a cylinder, a piston and a spring; the piston is arranged in the cylinder and divides the cylinder into a first cavity and a second cavity, the first cavity is provided with a first air hole; the second cavity is provided with a second air hole; the spring is arranged in the first cavity, and the spring is connected to the inner wall of the first cavity and the piston; the piston is used to be connected to the regulating valve; the air supply device is respectively connected to the first air hole and the second air hole, and the air supply device is used to output gas to the first cavity and the second cavity respectively to drive the piston to move.

[0007] Optionally, the cylinder includes a first end and a second end disposed away from each other along a first direction, the first air hole is disposed on the first end, and the second air hole is disposed on the second end; and the spring connects the first end and the piston.

[0008] Optionally, the cylinder includes a cylinder body and an end cover; the end cover is arranged at the first end, and the end cover is detachably connected to the cylinder body.

[0009] Optionally, a through hole is provided on the second end; a connecting rod is provided on the piston, the connecting rod passes through the through hole and at least partially extends out of the cylinder, and the connecting rod is used to connect to the regulating valve.

[0010] Optionally, the connecting rod and the piston are detachably connected.

[0011] Optionally, the air supply device includes a first air outlet and a second air outlet; the first air outlet is connected to the first air hole through a first air pipe; the second air outlet is connected to the second air hole through a second air pipe.

[0012] Optionally, a first sealing component is provided between the first air outlet and the first air pipe; and a second sealing component is provided between the second air outlet and the second air pipe.

[0013] Optionally, the gas supply device includes a signal receiving component, a control component and a gas supply component; the signal receiving component is used to receive a control signal; the gas supply component is used to output gas to the first air hole and the second air hole; the control component is electrically connected to the signal receiving component, and the control component is used to control the flow rate of gas output by the gas supply component to the first air hole and the second air hole based on the control signal received by the signal receiving component.

[0014] Optionally, the piston is provided with a sealing ring, and the sealing ring abuts against the inner wall of the cylinder.

[0015] Optionally, a limiting mechanism is provided in the cylinder, and the limiting mechanism is used to limit the piston.

[0016] In an embodiment of the present application, a single-acting pneumatic actuator for a regulating valve is provided, and the single-acting pneumatic actuator includes at least: an air supply device, a cylinder, a piston and a spring; the cylinder is divided into a first cavity and a second cavity by the piston, a first air hole is provided on the first cavity, and a second air hole is provided on the second cavity; the spring is provided in the first cavity, and the spring is connected to the inner wall of the first cavity and the piston; the piston is connected to the regulating valve; the air supply device is respectively connected to the first air hole and the second air hole, and the air supply device is used to output gas to the first cavity and the second cavity respectively, so as to drive the piston to move by the gas, thereby adjusting the regulating valve. The single-acting pneumatic actuator provided by the present application, during use, inputs gas into the second cavity through the air supply device to move the piston and overcome the spring force; when the piston moves close to the target position, the air supply device inputs gas into the first cavity, so that the air pressure of the gas in the first cavity produces an auxiliary force on the piston, so as to accurately control the movement of the piston and reduce the number of times the piston position is adjusted, thereby solving the problem that the existing pneumatic actuators need to adjust the position multiple times during use, which wastes time and affects the service life of the regulating valve.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of a single-acting pneumatic actuator for a regulating valve described in the present application;

[0020] Figure 2 is a schematic diagram of a cylinder described in this application.

[0021] Figure numerals: 1. air supply device; 11. first air outlet; 12. second air outlet; 13. first air pipe; 14. second air pipe; 2. cylinder; 21. first cavity; 211. first air hole; 22. second cavity; 221. second air hole; 23. first end; 24. second end; 3. piston; 31. connecting rod; 4. spring; 5. regulating valve; 6. external air source. DETAILED DESCRIPTION

[0022] The embodiments of the utility model will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The embodiment of the present application provides a single-acting pneumatic actuator for a regulating valve, and the embodiment of the present application may not limit the specific type of the regulating valve.

[0027] Reference Figure 1, shows a single-acting pneumatic actuator for a regulating valve described in the present application, the single-acting pneumatic actuator comprising: an air supply device 1, a cylinder 2, a piston 3 and a spring 4; the piston 3 is arranged in the cylinder 2 and divides the cylinder 2 into a first cavity 21 and a second cavity 22, the first cavity 21 is provided with a first air hole 211; the second cavity 22 is provided with a second air hole 221; the spring 4 is arranged in the first cavity, and the spring 4 is connected to the inner wall of the first cavity 21 and the piston 3; the piston 3 is used to be connected to the regulating valve 5; the air supply device 1 is respectively connected to the first air hole 211 and the second air hole 221, and the air supply device 1 is used to output gas to the first cavity 21 and the second cavity 22 respectively to drive the piston 3 to move.

[0028] In an embodiment of the present application, a single-acting pneumatic actuator for a regulating valve 5 is provided, and the single-acting pneumatic actuator at least includes: an air supply device 1, a cylinder 2, a piston 3 and a spring 4; the cylinder 2 is divided into a first cavity 21 and a second cavity 22 by the piston 3, a first air hole 211 is provided on the first cavity 21, and a second air hole 221 is provided on the second cavity 22; the spring 4 is arranged in the first cavity 21, and the spring 4 connects the inner wall of the first cavity 21 and the piston 3; the piston 3 is connected to the regulating valve 5; the air supply device 1 is respectively connected to the first air hole 211 and the second air hole 221, and the air supply device 1 is used to output gas to the first cavity 21 and the second cavity 22 respectively, so as to drive the piston 3 to move by the gas, thereby adjusting the regulating valve 5. The single-acting pneumatic actuator provided by the present application, during use, inputs gas into the second cavity 22 through the air supply device 1 to move the piston 3 and overcome the force of the spring 4; when the piston 3 moves close to the target position, the air supply device 1 inputs gas into the first cavity 21, so that the air pressure of the gas in the first cavity 21 generates an auxiliary force on the piston 3, so as to accurately control the movement of the piston 3 and reduce the number of times the position of the piston 3 is adjusted, thereby solving the problem that the existing single-acting pneumatic actuator needs to adjust the position multiple times during use, which wastes time and affects the service life of the regulating valve 5.

[0029] Furthermore, when the gas supply device 1 is in a degassing state, that is, the gas is stopped from being input into the cylinder 2 and the gas pressure in the cylinder 1 is made consistent with the outside, the gas loses its force on the piston 3, and the piston 3 returns to its initial position under the force of the spring 4, so that the valve position of the regulating valve 5 returns to its initial position. Specifically, it should be noted that those skilled in the art can select the initial position of the valve position of the regulating valve 5 according to actual production and use requirements, that is, specifically select and determine it as a degassing open or degassing closed regulating valve, which is not specifically limited in this application.

[0030] Optionally, the cylinder 2 described in the present application includes a first end 23 and a second end 24 arranged in opposite directions along a first direction, the first air hole 211 is arranged on the first end 23, and the second air hole 221 is arranged on the second end 24; the spring 4 connects the first end 23 and the piston 3.

[0031] In the embodiment of the present application, a first air hole 211 and a second air hole 221 are respectively provided at both ends of the cylinder 2 to maximize the use of the internal cavity of the cylinder 2, avoid clogging of the air hole when the piston 3 moves in the cylinder 2, and improve the reliability of the single-acting pneumatic actuator.

[0032] Optionally, the cylinder 2 described in the present application includes a cylinder body and an end cover; the end cover is arranged at the first end 23, and the end cover is detachably connected to the cylinder body.

[0033] In the embodiment of the present application, the first end 23 of the cylinder 2 is an end cover, and the end cover and the cylinder body are detachably connected. When the pneumatic actuator is used for a long time and causes the piston 3 to be worn, the end cover can be removed to achieve repair or replacement of the piston 3.

[0034] Optionally, a through hole is further provided on the second end 24 described in the present application; a connecting rod 31 is provided on the piston 3 , the connecting rod 31 passes through the through hole and at least partially extends out of the cylinder 2 , and the connecting rod 31 is used to connect the regulating valve 5 .

[0035] In the embodiment of the present application, a connecting rod 31 is provided on the piston 3. The connecting rod 31 extends out of the cylinder through the through hole and is connected to the regulating valve 5. When the pneumatic regulating valve is in use, the piston 3 moves under the action of the gas, thereby driving the valve position of the regulating valve 5 to be adjusted.

[0036] Optionally, the connecting rod 31 and the piston 3 described in the present application are detachably connected.

[0037] In the embodiment of the present application, the connecting rod 31 is detachably connected to the piston 3 . During use, the valve position adjustment control of different regulating valves 5 can be achieved by replacing the detachably connected connecting rod 31 .

[0038] Optionally, the air supply device 1 described in the present application includes a first air outlet 11 and a second air outlet 12 ; the first air outlet 11 is connected to the first air hole 211 through a first air pipe 13 ; the second air outlet 12 is connected to the second air hole 221 through a second air pipe 13 .

[0039] In the embodiment of the present application, the gas supply device 1 includes a first gas outlet 11 and a second gas outlet 12; the first gas outlet 11 is connected to the first gas hole 211 through the first gas pipe 13; the second gas outlet 12 is connected to the second gas hole 221 through the second gas pipe 13, and the gas is output to the cylinder 2 respectively through different gas pipes and gas holes to avoid mutual influence during the gas output process. It should be noted that those skilled in the art can select the type of the first gas pipe 13 and the second gas pipe 14 according to actual production and use requirements, and this application does not make specific restrictions.

[0040] Optionally, a first sealing component is provided between the first air outlet 11 and the first air pipe 13 described in the present application; and a second sealing component is provided between the second air outlet 12 and the second air pipe 14 .

[0041] In the embodiment of the present application, a first sealing component is provided between the first gas outlet 11 and the first gas pipe 13; a second sealing component is provided between the second gas outlet 12 and the second gas pipe 14, so as to reduce the risk of gas leakage during the gas output process of the gas supply device 1. It should be noted that those skilled in the art can select the type of sealing component according to actual production and use requirements, and this application does not make any specific limitation.

[0042] Optionally, the gas supply device 1 described in the present application includes a signal receiving component, a control component and a gas supply component; the signal receiving component is used to receive a control signal; the gas supply component is used to output gas to the first air hole and the second air hole; the control component is electrically connected to the signal receiving component, and the control component is used to control the flow rate of gas output by the gas supply component to the first air hole and the second air hole based on the control signal received by the signal receiving component.

[0043] In the embodiment of the present application, the gas supply device 1 may include at least a signal receiving component, a control component and a gas supply component; the signal receiving component is used to receive the control signal; the gas supply component is used to output gas to the first air hole and the second air hole; the control component is electrically connected to the signal receiving component. During use, the control component controls the flow rate of gas output by the gas supply component to the first air hole and the second air hole based on the control signal received by the signal receiving component, thereby realizing the regulation of the position of the piston 3, and then realizing the control and adjustment of the valve position of the regulating valve 5. It should be noted that technicians in this field can specifically select the position and type of the signal receiving component, as well as the type of the position of the control component according to actual production and use requirements, and this is not specifically limited in this application.

[0044] Specifically, the gas supply device 1 can also be connected to an external gas source 6 to obtain required gas.

[0045] Optionally, the piston 3 described in the present application is provided with a sealing ring, and the sealing ring abuts against the inner wall of the cylinder 2 .

[0046] In the embodiment of the present application, a sealing ring is provided on the piston 3, and the sealing ring abutting against the inner wall of the cylinder 2 prevents the gas in the first cavity 21 and the second cavity 22 from flowing mutually, thereby preventing the inaccurate movement of the piston 3. It should be noted that those skilled in the art can select the type and position of the sealing ring according to actual production and use requirements, and this is not specifically limited in the present application.

[0047] Optionally, a limiting mechanism is provided in the cylinder 2 described in the present application, and the limiting mechanism is used to limit the piston 3.

[0048] In an embodiment of the present application, a limiting mechanism is provided in the cylinder 2. When the pneumatic actuator is in use, the piston 3 moves with the input of gas. The setting of the limiting mechanism can prevent the piston 3 from moving excessively and damaging the regulating valve 5 or the piston 3.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A single-acting pneumatic actuator for a regulating valve, characterized in that: The single-acting pneumatic actuator comprises: an air supply device, a cylinder, a piston and a spring; The piston is arranged in the cylinder and the cylinder is divided into a first cavity and a second cavity, the first cavity is provided with a first air hole, and the second cavity is provided with a second air hole; The spring is arranged in the first cavity, and the spring is connected to the inner wall of the first cavity and the piston; the piston is used to be connected to the regulating valve; The gas supply device is respectively connected to the first gas hole and the second gas hole, and is used to output gas to the first cavity and the second cavity respectively to drive the piston to move.

2. The single-acting pneumatic actuator according to claim 1, characterized in that: The cylinder comprises a first end and a second end which are arranged in a first direction away from each other, the first air hole is arranged on the first end, and the second air hole is arranged on the second end; The spring connects the first end and the piston.

3. The single-acting pneumatic actuator according to claim 2, characterized in that: The cylinder comprises a cylinder body and an end cover; The end cover is arranged at the first end, and the end cover is detachably connected to the cylinder body.

4. The single-acting pneumatic actuator according to claim 2, characterized in that: The second end is provided with a through hole; The piston is provided with a connecting rod, the connecting rod passes through the through hole and at least partially extends out of the cylinder, and the connecting rod is used to connect the regulating valve.

5. The single-acting pneumatic actuator according to claim 4, characterized in that: The connecting rod and the piston are detachably connected.

6. The single-acting pneumatic actuator according to claim 1, characterized in that: The air supply device comprises a first air outlet and a second air outlet; The first air outlet is connected to the first air hole through a first air pipe; The second air outlet is communicated with the second air hole through a second air pipe.

7. The single-acting pneumatic actuator according to claim 6, characterized in that: A first sealing component is arranged between the first air outlet and the first air pipe; and a second sealing component is arranged between the second air outlet and the second air pipe.

8. The single-acting pneumatic actuator according to claim 1, characterized in that: The air supply device includes a signal receiving component, a control component and an air supply component; The signal receiving component is used to receive a control signal; The gas supply component is used to output gas to the first gas hole and the second gas hole; The control component is electrically connected to the signal receiving component, and is used to control the flow rate of gas output by the gas supply component to the first air hole and the second air hole based on the control signal received by the signal receiving component.

9. The single-acting pneumatic actuator according to claim 1, characterized in that: The piston is provided with a sealing ring, and the sealing ring abuts against the inner wall of the cylinder.

10. The single-acting pneumatic actuator according to claim 1, characterized in that: A limiting mechanism is arranged in the cylinder, and the limiting mechanism is used to limit the piston.

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