WO2018036497A1 - Drive device and valve actuator based on gas-fluid composite spring - Google Patents

Abstract

A drive device and valve actuator based on a gas-fluid composite spring. The drive device comprises a power cylinder (2). A gas-fluid composite spring device (12) is arranged on the power cylinder (2), and comprises a pressure vessel (13). A gas inlet (22) is provided at an upper end of the pressure vessel. An upper portion and lower portion within the pressure vessel (13) are respectively a compressed gas chamber (15) and a hydraulic fluid chamber (16). The compressed gas chamber (15) is filled with a compressed gas, and the hydraulic fluid chamber (16) is filled with a hydraulic fluid. A hydraulic fluid outlet (17) is provided at a lower end of the pressure vessel (13). The valve actuator comprises an actuator (1) and the power cylinder (2). The power cylinder (2) is arranged on the actuator (1), and is provided with the gas-fluid composite spring device (12). Compared to a metal spring or a metal spring cylinder employed in a conventional single-acting valve actuator, the gas-fluid composite spring device (12) of the present invention has numerous advantages in the structural design, manufacturing process, and installation and replacement thereof. In addition, the valve actuator of the present invention has significant improvement in application efficiency and reliability, saves energy, and is environmentally friendly.

Description

Drive device and valve actuator based on gas-liquid combined spring Technical field

The invention relates to the field of valve actuators, in particular to a driving device and a valve actuator based on a gas-liquid combined spring.

Background technique

The actuator is a control actuator for opening and closing the valve. Its structure generally includes a power actuator, an execution box, and a spring cylinder. Generally, it is used in an emergency working condition and pipeline application system in the event of an emergency. At the same time, when the control system loses power or air, the single-acting actuator can automatically reset and drive the valve to a pre-designed fail-safe position, thereby minimizing the potential hazard of the entire device. Single-acting actuators typically use energy stored in a compressed metal spring, UPS emergency power source, or accumulator tank, and other pre-stored energy such as a weight to act as actuator drive. Among them, the compressed metal spring is the most used actuator drive.

Actuator spring cylinders are mechanical components that work with the elasticity of a compression spring. The spring is a part made of an elastic material, which is deformed by an external force, and is restored to its original state after the external force is removed. Springs are generally made of spring steel. As the overall safety level of the system increases and the overall safety level of the actuator continues to increase, the spring requirements for valve actuators must also have sufficient mechanical life, fatigue strength and repeatable service life, and less serious accidents of spring breakage. .

However, in practical applications, pipeline valves are increasingly using large diameter, high pounds and large torques. In case of abnormal opening or closing of these emergency shut-off valves, we use traditional springs as the matching valve actuators. The more unsuitable: heavy weight, large volume, space occupation, long-term compression of the spring, reduced stiffness, reduced elastic force, easy fatigue failure, spring deformation, abnormal motion, and even a serious accident of spring breakage.

The use of conventional spring cylinders as a matching valve actuator (shown in Figure 1) has the following major drawbacks:

1. Actuator spring cylinders for driving large-size valves have always been a problem: heavy weight, large volume, and Use space and waste resources.

2. According to the working characteristics of the single-acting spring actuator, the spring is in a compressed state for a long time, which is easy to compress and deform, and spring fatigue occurs. The spring loses its original elasticity and reduces the reliability of the action in an emergency.

3. During normal use, as the use time increases and the frequency of action increases, the spring will fail and the thrust will gradually decrease or decrease. Actuator motion reliability and rich safety factors are constantly decreasing.

4. The force of the spring required by the actuator cannot be accurately quantified, and the time and speed at which the valve is driven cannot be finely controlled. Once the spring is shaped, the output force is determined, and the spring force cannot be adjusted, and it is less likely to increase.

5. The spring is easily deformed and produces abnormal noise, which causes an unsafe psychological burden; the spring break of the actuator also occurs from time to time.

6. Due to the working characteristics of the single-acting actuator, the spring output must have a considerable amount of force to drive the valve. Therefore, the conventional metal spring cylinder needs special tooling compression assembly, assembly efficiency and assembly risk when assembled to the actuator.

7. The spring cylinder assembly becomes very unlikely or very difficult once it needs to be replaced and repaired in the field.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide a hydraulic valve actuator based on a gas-liquid combined spring, which solves the problem that the conventional valve actuator adopts a traditional spring cylinder with heavy weight, large volume, space occupation and fatigue. Failure, installation trouble, etc.

The invention is achieved by the following technical solutions:

A driving device based on a gas-liquid combined spring, comprising a power cylinder, wherein the power cylinder is provided with a gas-liquid combined spring device, the gas-liquid combined spring device comprises a pressure vessel tank, and the upper end of the pressure vessel tank is provided with a gas input port, The upper part and the lower part of the pressure vessel tank are respectively a compressed gas chamber filled with compressed gas, the compressed oil chamber is filled with compressed oil, and the hydraulic oil chamber is filled with hydraulic oil, and the lower end of the pressure vessel tank is provided with hydraulic pressure Oil exports.

Further, the power cylinder includes a cylinder, a piston, a cylinder block and a piston rod, and the front end of the piston The cylinder inner cavity is a piston front cylinder, and the cylinder inner cavity at the rear end of the piston is a piston rear cylinder.

Further, the power cylinder is a hydraulic cylinder or a cylinder.

Further, the cylinder block is provided with a hydraulic oil passage communicating with the piston front cylinder, and the hydraulic oil outlet is connected to the piston front cylinder through the oil pipe and the hydraulic oil passage; when the hydraulic cylinder is oiled, the hydraulic cylinder is The piston pushes the piston rod forward, and at the same time, the gas-liquid combined spring device is compressed. When the hydraulic cylinder is drained, the piston retracts when the gas-liquid combined spring device and the hydraulic cylinder act together to pull down the piston rod.

Further, the cylinder block is provided with a hydraulic oil passage communicating with the piston front cylinder, and the hydraulic oil outlet is communicated with the piston front cylinder through the oil pipe and the hydraulic oil passage; when the cylinder is intakeed, the piston of the cylinder is pushed The piston rod moves forward, and at the same time, the gas-liquid combined spring device is compressed, and when the cylinder is deflated, the piston retracts when the gas-liquid combined spring device and the cylinder act together to pull down the piston rod.

Further, the upper end of the pressure vessel can is also provided with a pressure gauge for monitoring the internal pressure thereof in real time.

Further, an oil filtering device is disposed at the hydraulic oil outlet in the pressure vessel tank.

Further, the oil pipe is provided with a flow regulating valve, and the flow rate regulating valve adjusts the flow rate of the hydraulic oil, thereby controlling the speed of the pressure release, and ensuring that the movement process and the moving speed of the soft spring are precisely controllable.

Further, the oil pipe is further provided with a shut-off valve for closing or opening the gas-liquid combined spring device at any time.

The invention is achieved by another technical solution as follows:

A valve actuator includes an actuator and a power cylinder. The power cylinder is provided with a gas-liquid combined spring device. The power cylinder is mounted on a box of the actuator through a cylinder block, and the piston rod and the actuator of the power cylinder The forks are linked.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

The same function of "gas-liquid combined spring device" replaces the metal spring or metal spring cylinder used in the traditional single-acting valve actuator. "Gas-liquid combined spring device" is structural design, manufacturing process, manufacturing cost, installation difficulty, actuator-driven valve application efficiency, field replacement and fault repair Greatly improved.

Compared with the conventional metal springs which replace the traditional metal springs, the high-pressure gas has the advantages of small volume, light weight, easy compression, fatigue, reusability, rapid response, and convenient charging.

No matter whether it is in the factory installation or in the field replacement and replacement process, there is no accident, the safety is more reliable than the traditional spring, safe to use, easy to install and easy to replace.

Energy-saving, environmentally friendly, non-polluting, non-interfering, noise-free and many other unparalleled advantages. In the oil and gas storage and transportation, oil and gas, chemical, metallurgical and other widely used single-acting actuator valves and other industrial fields, the device is used as an output control device instead of a spring, which can reduce the use of a series of metal materials such as spring steel.

The gas-liquid combined spring device adopts hydraulic oil as the transmission medium, which has large rigidity, small elasticity, is not easy to be compressed, and has smooth transmission, can realize stepless speed regulation, self-lubricating and no rust.

DRAWINGS

The drawings are intended to provide a further understanding of the embodiments of the present invention, and are not intended to limit the embodiments of the invention. In the drawing:

Figure 1 is a schematic structural view of a conventional valve actuator;

2 is a schematic structural view of a driving device based on a gas-liquid combined spring using a hydraulic cylinder of the power cylinder of the present invention;

3 is a schematic structural view of a driving device based on a gas-liquid combined spring using a cylinder of a power cylinder according to the present invention;

4 is a schematic structural view of a valve actuator using a hydraulic cylinder of the power cylinder of the present invention;

Figure 5 is a schematic view showing the structure of a valve actuator using a cylinder of the power cylinder of the present invention;

Marked in the drawing and the corresponding part name:

1-actuator, 2-power cylinder, 3-cylinder, 4-piston, 5-cylinder seat, 6-piston rod, 7-piston front cylinder, 8-piston rear cylinder, 9-shut-off valve, 10-box Body, 11-way fork, 12-gas-liquid combined spring device, 13-pressure vessel tank, 14-flow regulating valve, 15-compressed gas chamber, 16-hydraulic oil chamber, 17-hydraulic oil outlet, 18-oil Tube, 19-hydraulic oil passage, 20-pressure gauge, 21-oil filter, 22-gas inlet, 23-spring cylinder.

detailed description

The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. As a limitation of the invention.

Example 1

As shown in FIG. 2, the driving device based on the gas-liquid combined spring comprises a power cylinder 2, the power cylinder 2 is a hydraulic cylinder, and the power cylinder 2 is provided with a gas-liquid combined spring device 12, and the gas-liquid combined spring device 12 The pressure vessel tank 13 is provided. The upper end of the pressure vessel tank 13 is provided with a gas inlet port 22. The upper and lower portions of the pressure vessel tank 13 are respectively a compressed gas chamber 15 and a hydraulic oil chamber 16, and the compressed gas chamber 15 is filled with compressed gas and hydraulic oil. The chamber 16 is filled with hydraulic oil, and the lower end of the pressure vessel tank 13 is provided with a hydraulic oil outlet 17.

The power cylinder 2 includes a cylinder block 3, a piston 4, a cylinder block 5 and a piston rod 6. The inner cavity of the cylinder 3 at the front end of the piston 1 is a piston front cylinder 7, and the inner cavity of the cylinder 3 at the rear end of the piston 4 is a piston rear cylinder 8. .

The cylinder block 5 is provided with a hydraulic oil passage 19 communicating with the piston front cylinder 7, and the hydraulic oil outlet 17 communicates with the piston front cylinder 7 through the oil pipe 18 and the hydraulic oil passage 19; when the hydraulic cylinder is oiled, the piston 4 of the hydraulic cylinder pushes the piston The rod 6 moves forward while the gas-liquid combined spring device 12 is compressed. When the hydraulic cylinder is drained, the piston 4 retracts the piston rod 6 by the combination of the gas-liquid combined spring device 12 and the hydraulic cylinder.

The upper end of the pressure vessel can 13 is also provided with a pressure gauge 20 for monitoring the internal pressure thereof in real time. An oil filter device 21 is provided at the hydraulic oil outlet 17 in the pressure vessel tank 13. The oil pipe 18 is provided with a flow regulating valve 14 for regulating the flow rate of the hydraulic oil through the flow regulating valve 14, thereby controlling the speed of the pressure release, and ensuring that the movement process and the operating speed of the soft spring are accurately controllable. The oil pipe 18 is also provided with a shut-off valve 9 for closing or opening the gas-liquid combined spring device 12 at any time.

Example 2

As shown in FIG. 3, the present invention is a driving device based on a gas-liquid combined spring. On the basis of the first embodiment, the power cylinder 2 is a cylinder, and the cylinder block 5 is provided with hydraulic oil connected to the piston front cylinder 7. The passage 19, the hydraulic oil outlet 17 communicates with the piston front cylinder 7 through the oil pipe 18 and the hydraulic oil passage 19; when the cylinder is intakeed, the piston 4 of the cylinder pushes the piston rod 6 to move forward, and at the same time, the gas-liquid combined spring device When the cylinder 12 is compressed and the cylinder is deflated, the piston 4 is retracted by the gas-liquid combination spring device 12 and the cylinder acting together to pull down the piston rod 6.

Example 3

As shown in FIG. 4, a valve actuator of the present invention comprises an actuator 1 and a hydraulic cylinder. The hydraulic cylinder comprises a cylinder 3, a piston 4, a cylinder block 5 and a piston rod 6. The inner cavity of the cylinder 3 at the front end of the piston 1 is The piston front cylinder 7, the inner chamber of the cylinder 3 at the rear end of the piston 4 is a piston rear cylinder 8, and the hydraulic cylinder is mounted on the casing 10 of the actuator 1 through the cylinder block 5, the piston rod 6 and the actuator of the hydraulic cylinder 1 of the fork 11 linkage. The hydraulic cylinder is provided with a gas-liquid combined spring device 12, and the gas-liquid combined spring device 12 includes a pressure vessel can 13. The upper end of the pressure vessel can 13 is provided with a gas input port 22 through which the gas inlet port 22 can be placed. The high pressure nitrogen gas is input. The upper and lower portions of the pressure vessel tank 13 are respectively a compressed gas chamber 15 and a hydraulic oil chamber 16, and the compressed gas chamber 15 is filled with compressed gas. The hydraulic oil chamber 16 is filled with hydraulic oil, and the lower end of the pressure vessel tank 13 is provided. There is a hydraulic oil outlet 17.

The cylinder block 5 is provided with a hydraulic oil passage 19 communicating with the piston front cylinder 7, and the hydraulic oil outlet 17 communicates with the piston front cylinder 7 through the oil pipe 18 and the hydraulic oil passage 19; when the hydraulic cylinder is oiled, the piston 4 of the hydraulic cylinder pushes the piston The rod 6 moves forward, and the piston rod 6 pushes the fork 11 to open the valve. At the same time, the gas-liquid combined spring device 12 is compressed, and when the hydraulic cylinder is drained, the piston 4 is combined by the gas-liquid combined spring device 12 and the hydraulic cylinder. Pulling the piston rod 6 to retract, the piston rod 6 drives the shift fork 11 to reversely move the valve.

The upper end of the pressure vessel can 13 is also provided with a pressure gauge 20 for real-time monitoring of the internal pressure thereof. The pressure gauge 20 can conveniently indicate the magnitude of the gas pressure and accurately display the value of the soft spring to accurately control the required force. Of course, pressure transmitters or pressure sensors can also be used to achieve the same quantitative pressure. The hydraulic oil outlet 17 in the pressure vessel tank 13 is provided with an oil filter Set 21. The oil pipe 18 is provided with a flow regulating valve 14 for controlling the elastic strength of the gas-liquid combined spring device 12. The oil pipe 18 is also provided with a shut-off valve 9 for closing or opening the gas-liquid combined spring device 12 at any time.

The structural principle of the gas-liquid combined spring device 12: the oil-gas spring is filled with compressed gas and oil in a closed container, and the device that uses the compressibility of the gas to realize the spring is called a gas spring. The oil and gas spring uses inert gas (nitrogen) as the elastic medium and oil as the force transmitting medium, which is generally composed of a gas spring and a hydraulic cylinder equivalent to a hydraulic damper.

Features: Since the nitrogen is stored in a closed spherical gas chamber, the pressure varies with the magnitude of the external load, so the oil and gas spring has the characteristic of variable stiffness and at the same time acts as a hydraulic damper.

Type: According to the structure, the oil and gas spring is divided into a single air chamber, a double air chamber and a two-stage pressure type. Single-chamber oil and gas springs are divided into two types: oil-gas separation and oil-gas separation. The invention adopts oil and gas non-separating type.

The working principle and the action relationship of the hydraulic valve actuator based on the gas-liquid combined spring are the main energy storage device, which is the main body of the compressed gas storage; the bottom hydraulic oil is the closed insulating medium of the high pressure gas. It is also the transmission medium for the release of power gas energy during work and energy conversion; the working power of the system energy is derived from the high-pressure compressible gas in the head space of the hydraulic oil in the closed container.

The high-pressure sealed compressed gas in the pressure vessel tank 13 is stored (pre-inflated) as a power, and the pressure vessel can 13 and the hydraulic oil at the lower end are used as isolation, and the liquid oil is used as a transmission medium to smoothly and safely convert the energy stored in the high-pressure compressed gas. Released for energy. When the hydraulic oil is returned to the pressure tank, the closed gas pressure is automatically pressurized to store energy for reuse.

The output energy can be easily adjusted by the pressure of the high-pressure gas filling. The filling valve can easily realize the charging and discharging of the high-pressure compressed gas in the closed space, and adjust the gas pressure to adjust the strength of the soft spring.

The output stroke and output thrust can be conveniently adjusted by comprehensively adjusting the pressure or volume of the compressed gas and the amount of hydraulic oil. The output force direction is unrestricted and the output actuators are usually piston type and can be connected to the output actuator via a high pressure hose.

The utility model relates to a hydraulic valve actuator based on a gas-liquid combined spring, which combines the advantages of gas and liquid, fully utilizes the characteristics of the compressed gas and the medium of the transmission medium, and uses the high pressure gas compressed by the gas according to the compressibility characteristics of the gas. The elastic element works for external expansion. Using the hydraulic system liquid isobaric transmission principle, the pressure of the compressed gas source is transmitted to the actuator through the liquid as the transmission medium equal pressure output.

The compressed gas volume of the gas-liquid soft spring tank can be controlled and the pressure (remote/in-place) can be read. The high pressure compressed gas has a constant pressure, high repeatability, and is not prone to failure and accidents. Therefore, the output torque of the actuator can be kept constant for a long time, and the purpose of accurately controlling the output thrust (torque) and the action time required by the actuator can be achieved.

The hydraulic speed control valve can be used to adjust the flow rate, output flow rate and speed of action. The pneumatic hydraulic soft spring can effectively absorb vibration and pulsation during the system transmission process, avoiding the turbulence of the valve movement process and achieving the gentle action of the actuator driving valve. This is evident in the high torque valve actuators required for high-grade, large-diameter valves.

According to the above principle, the high-pressure gas has the advantages of small volume, light weight, easy compression, fatigue, reusability, rapid response, and convenient charging by using a controllable compressed gas instead of a conventional metal spring. No matter in factory assembly, on-site installation or on-site replacement and replacement, there is no accident, and the safety is more reliable, safer to use, easier to install and easier to replace than conventional springs. Energy saving, environmental protection, pollution-free, no interference, no noise, stable performance, convenient output speed and power adjustment, and many other unparalleled advantages. In the oil and gas storage and transportation, oil and gas, chemical, metallurgical and other widely used single-acting actuator valves and other industrial fields, the device is used as an output control device instead of a spring, which can reduce the use of a series of metal materials such as spring steel.

Example 4

As shown in FIG. 5, in the valve actuator of the present invention, on the basis of the third embodiment, the power cylinder 2 is a cylinder, and the cylinder block 5 is provided with a hydraulic oil passage 19 communicating with the piston front cylinder 7, and a hydraulic oil outlet 17 The oil pipe 18 and the hydraulic oil passage 19 communicate with the piston front cylinder 7; when the cylinder is inflated, the piston 4 of the hydraulic cylinder pushes the piston rod 6 forward, and the piston rod 6 pushes the fork 11 to open the valve, and at the same time, the gas-liquid combination The spring device 12 is compressed, and when the cylinder is deflated, the piston 4 is in the gas-liquid combined spring device 12 and the gas The cylinder cooperates to pull down the piston rod 6 to retract, and the piston rod 6 drives the shift fork 11 to reversely move the valve.

The above description is a specific embodiment in which the main structure is a quarter-turn hydraulic actuator, and the objects, technical solutions and advantageous effects of the present invention are further described in detail. In fact, in the case of only the cylinder piston shaft (removing the shift box,) the output line stroke or the straight stroke actuator is also adapted.

It is to be understood that the foregoing is only illustrative of the embodiments of the invention, and is not intended to limit the scope of the present invention, any modifications, equivalents, and improvements made within the spirit and scope of the invention And the like should be included in the scope of protection of the present invention.

Claims (10)

A driving device based on a gas-liquid combined spring, comprising a power cylinder (2), characterized in that: the power cylinder (2) is provided with a gas-liquid combined spring device (12), and the gas-liquid combined spring device (12) comprises a pressure vessel tank (13), an upper end of the pressure vessel tank (13) is provided with a gas inlet port (22), and upper and lower portions of the pressure vessel tank (13) are respectively a compressed gas chamber (15) and a hydraulic oil chamber (16) The compressed gas chamber (15) is filled with a compressed gas, the hydraulic oil chamber (16) is filled with hydraulic oil, and the lower end of the pressure vessel tank (13) is provided with a hydraulic oil outlet (17). A gas-liquid combined spring-based driving device according to claim 1, characterized in that the power cylinder (2) comprises a cylinder (3), a piston (4), a cylinder block (5) and a piston rod ( 6) The inner cavity of the cylinder (3) at the front end of the piston (1) is a piston front cylinder (7), and the inner cavity of the cylinder (3) at the rear end of the piston (4) is a piston rear cylinder (8). A gas-liquid combined spring-based driving device according to claim 2, characterized in that the power cylinder (2) is a hydraulic cylinder or a cylinder. A gas-liquid combined spring-based driving device according to claim 3, characterized in that: the cylinder block (5) is provided with a hydraulic oil passage (19) communicating with the piston front cylinder (7), The hydraulic oil outlet (17) communicates with the piston front cylinder (7) through the oil pipe (18) and the hydraulic oil passage (19); when the hydraulic cylinder enters the oil, the piston (4) of the hydraulic cylinder pushes the piston rod (6) Moving forward, at the same time, the gas-liquid combined spring device (12) is compressed, and when the hydraulic cylinder is drained, the piston (4) acts together with the gas-liquid combined spring device (12) and the hydraulic cylinder to pull down the piston The rod (6) is retracted. A gas-liquid combined spring-based driving device according to claim 3, characterized in that: the cylinder block (5) is provided with a hydraulic oil passage communicating with the piston front cylinder (7) (19), the hydraulic oil outlet (17) communicates with the piston front cylinder (7) through the oil pipe (18) and the hydraulic oil passage (19); when the cylinder is intakeed, the piston (4) of the cylinder pushes the piston The rod (6) moves forward while the gas-liquid combined spring device (12) is compressed, and the piston (4) is pulled down by the gas-liquid combined spring device (12) and the cylinder when the cylinder is deflated. The piston rod (6) is retracted. A driving device based on a gas-liquid combined spring according to claim 4 or 5, characterized in that the upper end of the pressure vessel can (13) is further provided with a pressure gauge (20) for monitoring the internal pressure thereof in real time. A gas-liquid combined spring-based driving device according to claim 6, characterized in that the hydraulic oil outlet (17) in the pressure vessel tank (13) is provided with an oil filtering device (21). A gas-liquid combined spring-based driving device according to claim 7, characterized in that the oil pipe (18) is provided with a flow regulating valve (14), and the flow rate of the hydraulic oil is regulated by the flow regulating valve (14). , thus controlling the speed of pressure release, ensuring that the movement process and speed of the soft spring are precisely controllable. A driving device based on a gas-liquid combined spring according to any one of the preceding claims, characterized in that: the oil pipe (18) is further provided with a shut-off valve (9) for closing or opening the gas-liquid combined spring at any time. Device (12). A valve actuator according to any one of claims 1-9, comprising an actuator (1) and a power cylinder (2), characterized in that the power cylinder (2) is provided with a gas-liquid combined spring device (12) The power cylinder (2) is mounted on the casing (10) of the actuator (1) via a cylinder block (5), the piston rod (6) of the power cylinder (2) and the actuator (1) Fork (11) Linkage.

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