CN104565506B - Valve is with double dynamical integrated explosion-proof electrohydraulic actuator - Google Patents

Abstract

The invention discloses a dual-power integrated explosion-proof electro-hydraulic actuator for valves, which includes an electric control box, a double-acting oil cylinder and a hydraulic power unit; the double-acting oil cylinder is provided with a displacement sensor for detecting the displacement of the piston and a pressure sensor for detecting the pressure Sensors and double-acting oil cylinders are driven by a hydraulic power unit for telescopic movement; the hydraulic power unit is an integration of motors, pumps, integrated blocks, flow matching valve blocks, pipelines, etc., and the valve of the present invention uses dual power integrated explosion-proof electro-hydraulic The actuator and oil cylinder have their own displacement and pressure detection, which creates conditions for the realization of high-precision positioning double closed-loop control. The modular design is adopted, the function layout is reasonable, and the degree of integration and explosion-proof performance are improved.

Description

Double power integrated explosion-proof electro-hydraulic actuator for valves

technical field

The invention relates to an electro-hydraulic actuator, in particular to a dual-power integrated explosion-proof electro-hydraulic actuator for valves.

Background technique

As a power device, the valve actuator integrates pneumatic, hydraulic, mechanical transmission, control, electromechanical, computer, communication and other technologies, and can quickly and stably control the position of the valve accurately. It has been widely used in petroleum, electric power, The driving parts of valves in water conservancy, metallurgy, papermaking, aerospace, pipeline, petrochemical, industrial equipment, food processing and other fields. Electro-hydraulic actuator is one of the more commonly used actuators. It is generally used in occasions with fast speed, large output and high control precision. The upper control system sends instructions to the actuator, and the actuator controls the hydraulic power system to drive the valve to do linear motion. At the same time, the actuator must also detect the load of the valve in real time and intelligently diagnose various faults of the valve. The most widely used electro-hydraulic actuator on the market is the servo valve-controlled electro-hydraulic actuator, which adopts an open cycle hydraulic system, and adjusts the flow direction and flow of hydraulic oil by controlling the servo valve to realize the adjustment of the controlled object, but there are The technical problems of exposed cables, low degree of integration, and poor explosion-proof performance.

Contents of the invention

In view of this, the purpose of the present invention is to provide a dual-power integrated explosion-proof electro-hydraulic actuator for valves, which adopts modular design and reasonable functional layout, creates conditions for realizing closed-loop control, and improves the degree of integration and explosion-proof performance.

The dual-power integrated explosion-proof electro-hydraulic actuator for valves of the present invention includes an electric control box, a double-acting oil cylinder and a hydraulic drive mechanism; the double-acting oil cylinder is provided with a displacement sensor for detecting the displacement of the piston; the double-acting oil cylinder is driven by a hydraulic drive mechanism Drive telescopic movement;

Further, the hydraulic drive mechanism includes an integrated valve block and a drive motor and an oil pump installed on the integrated valve block; the electrical control box includes a box body and electrical components installed in the box; the box body and the integrated valve block are fixedly installed on the The cylinder base of the double-acting cylinder, the signal line of the displacement sensor and the control line of the drive motor are routed along the interior of the cylinder base;

Further, the oil pump is fixed on the top of the integrated valve block, and the drive motor is fixed on the bottom of the integrated valve block; the hydraulic drive mechanism also includes an oil tank and a motor explosion-proof cover that are correspondingly covered outside the oil pump and the drive motor and fixed on the integrated valve block;

Further, the hydraulic drive mechanism also includes a rotary explosion-proof sleeve, an oil seal, a liquid level plug, a flow matching module, a safety valve module and a valve group protective cover; there are two oil pumps, one is an acceleration pump, and the other is an output pump. The pump and the accelerator pump are responsible for providing speed, and the output pump is responsible for providing power. There are also two driving motors and one-to-one corresponding driving of the two oil pumps to form a set of dual-power hydraulic system that works together. The output shaft of the driving motor passes through the corresponding oil pump shaft. The transmission is connected to the input shaft of the corresponding oil pump. The oil pump shaft passes through the integrated valve block vertically. The rotating flameproof sleeve is sleeved on the outside of the oil pump shaft and fixed on the integrated valve block. The inner cavity of the oil tank is isolated from the inner cavity of the explosion-proof cover of the motor; the liquid level plug is fixed on the top of the oil tank; the flow matching module and safety valve module are fixed on the side of the integrated valve block; the valve group protective cover covers the flow matching module and safety valve The module is external and fixed to the integrated valve block;

Further, the double-acting oil cylinder is also provided with a pressure sensor for detecting the pressure in the working chamber; the pressure sensor and the displacement sensor are fixed on the cylinder seat of the double-acting oil cylinder; the cylinder seat is fixed with a cover covering the pressure sensor and the displacement sensor External blast enclosures;

Further, the inside of the cylinder base of the double-acting oil cylinder is provided with wiring holes for arranging pressure sensor signal lines, displacement sensor signal lines and drive motor control lines;

Further, a flameproof sleeve is fixed at the junction of the wiring hole in the cylinder seat and the box body and the integrated valve block;

Further, the hydraulic drive mechanism also includes a manual pump installed on the integrated valve block for providing high-pressure oil for the double-acting cylinder and a switch for switching between manual drive mode and electric drive mode;

Further, the box is provided with an openable box cover, and the electrical components in the box include a controller for receiving the displacement signal of the double-acting oil cylinder, the pressure signal in the working chamber of the double-acting oil cylinder, and the speed signal of the driving motor, connected to the controller The OLED man-machine display at the signal output terminal and the operation panel connected to the signal input terminal of the controller;

Further, lifting lugs are fixed on the integrated valve block.

The beneficial effects of the present invention are: the dual-power integrated explosion-proof electro-hydraulic actuator for the valve of the present invention, the oil cylinder has its own displacement detection, which creates conditions for the realization of closed-loop control, adopts modular design, and has a reasonable functional layout, which improves the degree of integration and explosion-proof performance .

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is A-A sectional view of Fig. 1;

Fig. 3 is the B-B sectional view of Fig. 1;

Fig. 4 is an axonometric view of the present invention;

Fig. 5 is a structural schematic diagram of a hydraulic drive mechanism;

FIG. 6 is a top view of FIG. 5 .

detailed description

Fig. 1 is a schematic structural view of the present invention; Fig. 2 is a sectional view of A-A of Fig. 1; Fig. 3 is a sectional view of B-B of Fig. 1; Fig. 4 is an axonometric view of the present invention, and Fig. 5 is a structural representation of a hydraulic drive mechanism; Fig. 6 is a diagram 5, as shown in the figure: the dual-power integrated explosion-proof electro-hydraulic actuator for the valve of this embodiment includes an electrical control box 1, a double-acting cylinder 2 and a hydraulic drive mechanism 3; the double-acting cylinder 2 is provided with a The displacement sensor 4 for detecting the displacement of the piston; the double-acting cylinder 2 is driven by the hydraulic drive mechanism 3 for telescopic movement, and is composed of three major modules: the electrical control box 1, the double-acting cylinder 2 and the hydraulic drive mechanism 3, and adopts a modular design with a reasonable functional layout , The oil cylinder has its own displacement detection, which creates conditions for the realization of closed-loop control and improves the degree of integration and explosion-proof performance.

In this embodiment, the hydraulic drive mechanism 3 includes an integrated valve block 5 and a drive motor and an oil pump installed on the integrated valve block 5; the electrical control box 1 includes a box body 6 and electrical components 7 installed in the box body 6; Both the box body 6 and the integrated valve block 5 are fixedly installed on the cylinder seat 8 of the double-acting cylinder 2, and the signal line of the displacement sensor 4 and the control line of the driving motor are routed along the interior of the cylinder seat 8. The modular design is adopted, and the functional layout is reasonable and convenient. Assembly, high degree of integration, built-in wiring, no exposed cables, good explosion-proof performance of the system.

In this embodiment, the oil pump is fixed on the top of the integrated valve block 5, and the drive motor is fixed on the bottom of the integrated valve block 5; The oil tank 9 and the motor explosion-proof cover 10 are provided with two oil pumps, one is an acceleration pump and the other is an output pump, and two drive motors are also installed to drive the two oil pumps in a one-to-one correspondence to form a dual-power hydraulic system that works together , to receive the speed control signal from the electrical control box 1. When moving fast, it provides a large flow supply for the hydraulic cylinder components. In the positioning stage, it provides a small flow supply to ensure accurate positioning. The oil tank 9 and the motor explosion-proof cover 10 are set to make the hydraulic power source Fully enclosed, good explosion-proof performance.

In this embodiment, the hydraulic drive mechanism also includes a rotary flameproof sleeve 18, an oil seal 19, a liquid level plug 20, a flow matching module 21, a safety valve module 22 and a valve group protective cover 23; two oil pumps are provided in total, One is the acceleration pump 24, and the other is the output pump 25. The acceleration pump is responsible for providing speed, and the output pump is responsible for providing power. There are also two drive motors that drive the two oil pumps in one-to-one correspondence to form a dual-power hydraulic system that works together. , the output shaft of the driving motor is connected to the input shaft of the corresponding oil pump through the corresponding oil pump shaft 26, the oil pump shaft 26 passes through the integrated valve block 5 vertically, and the rotating flameproof sleeve 18 is sleeved on the outside of the oil pump shaft 26 and fixed on the integrated valve Block 5, the oil seal 19 is set between the oil pump shaft 26 and the integrated valve block 5 to isolate the inner cavity of the oil tank 9 from the inner cavity of the motor explosion-proof cover 10; the liquid level plug 20 is fixed on the top of the oil tank 9; the flow rate is matched The module 21 and the safety valve module 22 are fixed on the side of the integrated valve block 5; the valve group protective cover 23 is covered outside the flow matching module 21 and the safety valve module 22 and fixed on the integrated valve block 5; the motor driving the output pump 25 is the output motor 27. The motor that drives the acceleration pump 24 is the acceleration motor 28, and the double power unit works together to achieve the perfect combination of fast and accurate positioning; the motor is located inside the explosion-proof cover, and the motor cable is connected to the electric control box through the cable explosion-proof channel 29, and the fuel tank 9 is located on the upper side, the rotating flameproof sleeve 18 ensures the flameproof requirements of the electrical cavity, and the multi-layer sealing measures ensure the tightness of the fuel tank 9; the fuel tank 9 is a fully enclosed fuel tank, the system pressure is automatically balanced, and it is not connected to the atmosphere , which ensures that the oil will not be oxidized for a long time, improves the service life of the hydraulic oil, and requires no maintenance; the flow matching module 21 is located inside the valve group cavity and is completely sealed. Oil cylinder acceleration, deceleration, precise positioning, reversing and other actions can automatically balance the internal leakage, and also has the reverse self-locking function of the check valve; the safety valve module 22 is also inside the valve group cavity, and its function is to adjust the maximum pressure of the system, Realize the highest pressure protection and prevent the motor from overloading; manual pump 15 function: when the system loses power or is inconvenient for electric operation, manual manual operation controls the reciprocating movement of the oil cylinder; the pressure oil port A30 and the pressure oil port B31 are respectively connected to the two chambers of the oil cylinder , respectively control the extension and retraction of the oil cylinder, and the multi-layer sealing structure ensures good sealing; the integrated valve block 5 of the cube structure layout is not only the passage for the oil to flow through but also the installation support for all components, and the manual pump is located on the front side , the valve group is located on the side, the two motors are located on the lower side, the oil tank 9 is located on the top, the oil circuit and circuit passage are located on the left, and the cleaning and oil draining device is located on the right.

In this embodiment, the double-acting oil cylinder 2 is also provided with a pressure sensor 11 for detecting the pressure in the working chamber; the pressure sensor 11 and the displacement sensor 4 are fixed on the cylinder block 8 of the double-acting oil cylinder 2; The explosion-proof cover 12 covering the pressure sensor 11 and the displacement sensor 4 is fixed on the top. The oil cylinder has its own displacement and pressure detection, and has a high degree of integration, creating conditions for closed-loop control and improving explosion-proof performance.

In this embodiment, the cylinder seat 8 of the double-acting oil cylinder 2 is provided with a wiring hole 13 for arranging the signal line of the pressure sensor 11, the signal line of the displacement sensor 4 and the control line of the driving motor. The wiring is built-in and there are no exposed cables. , The system has good explosion-proof performance.

In this embodiment, flameproof sleeves 14 are fixed at the joints between the wiring holes 13 in the cylinder base 8 and the box body 6 and the integrated valve block 5, and the joint surfaces of the cylinder base 8 and the box body 6 and the integrated valve block 5 All are equipped with hydraulic and pneumatic O-shaped rubber sealing rings surrounding the outside of the corresponding flameproof sleeve 14; further improving the explosion-proof performance.

In this embodiment, the hydraulic drive mechanism 3 also includes a manual pump 15 installed on the integrated valve block 5 for providing high-pressure oil for the double-acting cylinder 2 and a switch for switching between manual drive mode and electric drive mode 16; The purpose of manually controlling the action of the actuator can be realized without an external power supply.

In this embodiment, the box body 6 is provided with an openable box cover, and the electrical components 7 in the box body 6 include signals for receiving the displacement signal of the double-acting oil cylinder 2, the pressure signal in the working chamber of the double-acting oil cylinder 2, and the rotational speed of the driving motor. The signal controller, the OLED human-machine display connected to the signal output of the controller and the operation panel connected to the signal input of the controller, the electrical components 7 also include wireless, bluetooth, infrared, bus and other upper computer communication devices.

In this embodiment, the integrated valve block 5 is fixed with lifting lugs 17, which can lift the hydraulic drive mechanism 3, which is convenient for assembly and use.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (8)

1. A dual-power integrated explosion-proof electro-hydraulic actuator for a valve, characterized in that: it includes an electrical control box, a double-acting oil cylinder and a hydraulic drive mechanism; the double-acting oil cylinder is provided with a displacement sensor for detecting piston displacement; The oil cylinder is driven by a hydraulic drive mechanism for telescopic movement; the hydraulic drive mechanism includes an integrated valve block and a drive motor and an oil pump installed on the integrated valve block; the electrical control box includes a box and electrical components installed in the box; the box and The integrated valve blocks are all fixedly installed on the cylinder seat of the double-acting cylinder, and the signal line of the displacement sensor and the control line of the drive motor are routed along the interior of the cylinder seat; the hydraulic drive mechanism also includes a rotary flameproof sleeve, an oil seal, a liquid level plug, Flow matching module, safety valve module and valve group protective cover; there are two oil pumps in total, one is the acceleration pump and the other is the output pump. One correspondingly drives two oil pumps to form a set of dual-power hydraulic system that works together. The output shaft of the driving motor is connected to the input shaft of the corresponding oil pump through the corresponding oil pump shaft. The sleeve is set on the outside of the oil pump shaft and fixed on the integrated valve block. The oil seal is arranged between the oil pump shaft and the integrated valve block to isolate the inner cavity of the oil tank from the inner cavity of the motor explosion-proof cover; the liquid level plug is fixed on the top of the oil tank; The flow matching module and the safety valve module are fixed on the side of the integrated valve block; the valve block protective cover is outside the flow matching module and the safety valve module and fixed on the integrated valve block. 2. The dual-power integrated explosion-proof electro-hydraulic actuator for valves according to claim 1, characterized in that: the oil pump is fixed on the top of the integrated valve block, and the driving motor is fixed on the bottom of the integrated valve block; the hydraulic drive mechanism also includes Corresponding to the explosion-proof cover of the oil tank and the motor, which are covered outside the oil pump and the drive motor and fixed to the integrated valve block. 3. The dual-power integrated explosion-proof electro-hydraulic actuator for valves according to claim 2, characterized in that: the double-acting oil cylinder is also provided with a pressure sensor for detecting the pressure in the working chamber; the pressure sensor and the displacement sensor Both are fixed on the cylinder base of the double-acting oil cylinder; the cylinder base is fixed with an explosion-proof cover covering the outside of the pressure sensor and the displacement sensor. 4. The dual-power integrated explosion-proof electro-hydraulic actuator for valves according to claim 3, characterized in that: inside the cylinder seat of the double-acting oil cylinder, there are used for arranging pressure sensor signal lines, displacement sensor signal lines and drive motor control. Wire routing holes. 5. The dual-power integrated explosion-proof electro-hydraulic actuator for valves according to claim 4, characterized in that: explosion-proof sleeves are fixed at the joints between the wiring holes in the cylinder seat and the box body and the integrated valve block. 6. The dual-power integrated explosion-proof electro-hydraulic actuator for valves according to claim 5, characterized in that: the hydraulic drive mechanism also includes a manual pump installed on the integrated valve block for providing high-pressure oil for the double-acting cylinder And a toggle switch for switching between manual drive mode and electric drive mode. 7. The dual-power integrated explosion-proof electro-hydraulic actuator for valves according to claim 6, characterized in that: the box is provided with an openable box cover, and the electrical components in the box include components for receiving displacement signals of double-acting cylinders. , the pressure signal in the working chamber of the double-acting oil cylinder, the controller of the driving motor speed signal, the OLED man-machine display connected to the signal output end of the controller, and the operation panel connected to the signal input end of the controller. 8. The dual-power integrated explosion-proof electro-hydraulic actuator for valves according to claim 7, characterized in that: the integrated valve block is fixed with lifting lugs.