CN108980137A - A kind of executing agency of high response long-life high reliability - Google Patents

Abstract

The invention discloses a high-response, long-life and high-reliability actuator, which includes a shell, an oil inlet part, an oil return port, a solenoid valve part and its controller, a one-way valve, a spring damping system, a valve seat, and a piston. Rod actuator, in which the solenoid valve part is composed of electromagnet, armature, and valve core; the armature is rigidly connected with the valve core, and a filter and an orifice are set before the check valve of the oil inlet, and the check valve can prevent the main valve chamber from The oil flows back into the oil inlet; a spring damping system is set between the control port and the oil return port, which plays a buffer role in the process of oil pressure relief at the control port, slows down the rigid collision between the piston rod and the piston sleeve, and improves reliability. In addition, there is a cooling circuit on the valve body and the valve core, so that the oil flows through the air gap between the electromagnet and the armature, which has a certain cooling effect on the electromagnet and improves its working reliability. .

Description

An actuator with high response, long life and high reliability

technical field

The invention relates to a high-response, long-life and high-reliability actuator, in particular to a high-reliability single-outlet rod actuator for small and medium-sized loads whose response can reach more than 60 Hz.

Background technique

High-response hydraulic actuators are required in petrochemical enterprises, aviation, and aerospace fields. Especially in petrochemical enterprises, in order to achieve energy-saving effects, various types of gas volume adjustment systems have been studied at home and abroad, and high-response hydraulic actuators are the most important. an important component of .

At present, the air volume adjustment system has problems such as motion sticking, poor reliability, and short life in terms of hydraulic actuators.

Contents of the invention

The purpose of the present invention is to provide a high-reliability single-rod type actuator with a response of more than 60 Hz for small and medium-sized loads, which has the characteristics of fast response and long life time.

The technical solution for realizing the purpose of the present invention is: a high-response, long-life and high-reliability actuator, which consists of a housing, a valve body, a solenoid valve component and its controller, an oil inlet component, an oil return port, a one-way valve, Composed of spring damping system, valve seat and piston rod actuator;

The solenoid valve components include a valve core, screws, an armature and an electromagnet, the solenoid valve components are embedded in the inner hole of the valve body, the valve core and the armature are rigidly connected by screws, the valve body is embedded in the inner hole of the housing, and the oil A one-way valve is set between the inlet part and the solenoid valve part, the throttle hole is embedded in the oil inlet part, the valve core and the oil return port are positioned and sealed by the valve seat, and the piston rod actuator and the oil return port are positioned and sealed. Equipped with spring damping system;

When the electromagnet is in the de-energized state, the spool and armature are located at the far right end, the throttle window is opened, and the inlet oil can flow through the solenoid valve to the piston chamber; At the left end, the throttling window is closed, and the oil in the piston cavity enters the oil return tank under the load force;

The spring damping system includes a spring and a damper. The spring is wound around the outside of the damper. When the solenoid valve parts are in the suction state, the oil in the spring damping system chamber communicates with the oil return port, and the oil in the piston chamber is under load. The spring of the spring damping system is compressed to the right under the action of the spring to form a cavity A, and the oil in the piston cavity flows to the cavity A, so that the piston rod actuator moves.

Further, the spool valve pair formed between the valve core and the valve body adopts a structure in which a shoulder + plane seal is set in the middle of the valve core. During the movement of the valve core, the left side of the valve core is limited by the shoulder on the valve body. The right side is limited by the valve seat.

Further, the electromagnet is composed of an "E" structure iron core directly wound with a coil.

Furthermore, the electromagnet is in a wet state during normal operation, and the high-pressure oil at the inlet passes through the gap between the housing and the valve body, and the cooling circuit from the valve body to the oil return port, and immerses into the coil and iron core inside the electromagnet.

Further, the controller includes a communication interface, which communicates with the upper-level signal through RS485 or CAN bus; the controller adopts a pulse width modulation control method to provide voltage signals for the electromagnet.

Compared with prior art, remarkable advantage of the present invention is:

(1) The present invention drives the actuator through the solenoid valve, and the piston rod actuator is directly integrated with the solenoid valve in the same valve body, which improves the structural rigidity, integration and transmission efficiency of the system; (2) in terms of controller design , a reasonable control strategy is adopted, which not only greatly improves the response speed of opening and closing, but also reduces the heat generation of the controller, and improves its working reliability and service life; (3) In terms of mechanism design, multiple seals are adopted The structure of the plane seal improves the sealing reliability of the actuator in the long-term continuous working state; (4) The slide valve pair formed between the valve core and the valve body adopts the structure of setting a small shoulder in the middle of the valve core + plane seal The method not only can form an annular window to minimize the pressure drop of the liquid flow through the solenoid valve parts, but also the direction of the liquid flow at the throttling window is parallel to the direction of the high-pressure oil inlet, which can reduce the internal hydraulic force of the solenoid valve to almost zero. Reduce the influence of hydraulic force, thereby improving the response rate of the solenoid valve. During the movement of the valve core, the left side is limited by the shoulder on the valve body, and the right side is limited by the valve seat; (5) There is a spring damping system between the piston rod actuator and the oil return port. When closed (closed), the oil in the spring damping system cavity communicates with the oil return port, and the oil in the piston cavity compresses the spring of the spring damping system to the right under the action of the load force, forming a cavity A, and the piston cavity The oil can quickly flow to the cavity A, so that the piston rod actuator can move at high speed, and then buffer and reset under the restriction of the damping hole, which not only effectively improves the response speed, but also improves its working stability.

Description of drawings

Fig. 1 is a schematic diagram of the actuator of the present invention.

Fig. 2 is a structural schematic diagram of the solenoid valve spool pair.

Fig. 3 is a structural view of the electromagnet coil components.

Figure 4 is a schematic diagram of the controller circuit.

Fig. 5 is a schematic diagram of the structure of the spring damping system.

Fig. 6 is a structural diagram of a one-way valve.

Marks in the figure: 1. Housing, 2. Valve body, 3. Solenoid valve parts, 4. Oil inlet parts, 5. Orifice, 6. Check valve, 7. Spring-damping system, 8. Oil return Port, 9, valve seat, 10, spool, 11, piston sleeve, 12, piston rod, 13, return spring, 14, screw, 15, armature, 16, electromagnet, 17, controller, 18, damper, 19. Spring.

Detailed ways

As shown in Figure 1, a high-response, long-life and high-reliability actuator consists of a housing 1, a valve body 2, a solenoid valve part 3 and its controller 17, an oil inlet part 4, an oil return port 8, a single Composed of directional valve 6, spring damping system 7, valve seat 9, and piston rod actuator 12;

The solenoid valve component 3 includes a valve core 10, a screw 14, an armature 15 and an electromagnet 16, the solenoid valve component 3 is embedded in the inner hole of the valve body 2, the valve core 10 and the armature 15 are rigidly connected by the screw 14, and the valve body 2 Embedded in the inner hole of the housing 1, a check valve 6 is set between the oil inlet part 4 and the solenoid valve part 3, the throttle hole 5 is embedded in the oil inlet part 4, the valve core 10 and the oil return port 8 Positioning and sealing are realized by the valve seat 9, and a spring damping system 7 is provided between the piston rod actuator 12 and the oil return port 8;

The solenoid valve component 3 is a two-position three-way normally open valve. When the electromagnet 16 is in a power-off state, the valve core 10 and the armature 15 are located at the far right end, the throttle window is opened, and the oil at the inlet can flow through the solenoid valve. To the piston chamber; when the electromagnet 16 is energized, the spool 10 and the armature 15 are attracted to the leftmost end, the throttle window is closed, and the oil in the piston chamber enters the oil return tank under the action of the load force. The return spring 13 is arranged on the outer periphery of the valve core 10 , and its two ends are in contact with the solenoid valve part 3 and the valve body 2 . A piston sleeve 11 is sheathed on the outer periphery of the piston rod actuator 12 .

In the present invention, the side close to the oil return port 8 is defined as the right end, and the side close to the electromagnet 16 is defined as the left end.

As shown in Figure 2, the spool pair formed between the valve core 10 and the valve body 2 adopts the structural method of setting a shoulder + plane seal in the middle of the valve core 10, which can not only form an annular window to minimize the liquid flow Through the pressure drop of the solenoid valve part 3, and the direction of the liquid flow at the throttle window is parallel to the direction of the high-pressure oil inlet, the internal hydraulic force of the solenoid valve can be reduced to almost zero, reducing the influence of the hydraulic force, thereby improving the response rate of the solenoid valve . Adopting the plane sealing structure can also ensure the sealing reliability of the electromagnetic valve part 3 in the continuous switching working state for a long time. During the movement of the valve core 10, the left side is limited by the shoulder on the valve body 2, and the right side is limited by the valve seat 9.

As shown in Figure 3, the electromagnet 16 is composed of an "E" structure iron core directly wound around a coil. Reduce costs during the mass production phase. In addition, the design of the electromagnet adopts the redundant design concept of double-coil parallel operation, and the double-redundant design feature improves its working reliability. It is a wet state during normal operation. The high-pressure oil at the inlet passes through the gap between the housing 1 and the valve body 2, and the cooling circuit from the valve body 2 to the oil return port 8, and immerses into the coil and iron core inside the electromagnet 16. , to play the role of cooling and heat dissipation, to ensure the high reliability of the actuator in the long-term uninterrupted working state.

As shown in Figure 4, the controller 17 includes a communication interface, which realizes timely communication with the superior signal through RS485 or CAN bus, the power ground and the digital ground of digital communication are in an isolated state, and have the function of overcurrent protection . The controller adopts the pulse width modulation PWM control method to provide voltage signals for the electromagnet 16, and adopts high-voltage high-speed pull-in, low-voltage maintenance, and release adopts a switching control strategy that applies a negative direction voltage to quickly reduce the coil current to zero, so that The electromagnetic valve part 3 achieves the characteristics of high-speed suction and high-speed release.

As shown in Figure 5, the spring damping system 7 is located between the piston rod actuator 12 and the oil return port 8, including a spring 19 and a damper 18, the spring 19 is wound outside the damper 18, when the solenoid valve part 3 is in the suction position When closed, the oil in the cavity of the spring damping system 7 communicates with the oil return port, and the oil in the piston cavity compresses the spring of the spring damping system 7 to the right under the action of the load force, forming a cavity A. The oil can quickly flow to the cavity A, so that the piston rod actuator can move at high speed, and then buffer and reset under the restriction of the damping hole, which not only effectively improves the response speed, but also improves its working stability.

The piston rod actuator 12 is a single-rod, single-acting form. The open state of the solenoid valve is activated by high-pressure oil, and the closed state of the solenoid valve is reset by the load force.

As shown in Figure 6, the one-way valve 6 is located at the oil inlet, and the spool of the one-way valve 6 adopts a planar sealing structure to ensure the sealing of the actuator in the present invention under the long-term continuous switching working state. reliability.

The valve seat 9 is located between the valve core 10 and the oil return port 8, and the adjustment and limitation of the displacement of the valve core 10 are realized through the actual matching length.

The working principle of the invention is as follows: the controller receives the signal from the upper computer and outputs a response voltage to the electromagnet to control the movement of the piston rod actuator. The electromagnet is in the power-off state, the spool and armature are located at the far right end, the throttle window is opened, the inlet oil can flow through the solenoid valve to the piston chamber, the piston rod is activated, and the actuator moves; when the electromagnet is energized, the spool It is attracted to the armature and is located at the far left end, the throttle window is closed, the oil in the piston chamber flows through the spring damping system under the action of the load force and enters the oil return port tank, and the piston rod resets at the same time.

Claims (6)

1. a kind of executing agency of high response long-life high reliability, which is characterized in that by shell (1), valve body (2), solenoid valve Component (3) and its controller (17), oil inlet mouthpiece (4), oil return opening (8), check valve (6), spring-damp system (7), valve seat (9) it is formed with piston rod executing agency (12)；

The electromagnetic valve components (3) include spool (10), screw (14), armature (15) and electromagnet (16), electromagnetic valve components (3) In the inner hole of valve body (2), spool (10) and armature (15) are rigidly connected by screw (14), and valve body (2) is embedded in shell (1) Inner hole in, between oil inlet mouthpiece (4) and electromagnetic valve components (3) be arranged check valve (6), throttle orifice (5) be embedded in oil inlet oral area In part (4), realize positioning and sealing by valve seat (9) between spool (10) and oil return opening (8), piston rod executing agency (12) and Spring-damp system (7) are equipped between oil return opening (8)；

When electromagnet (16) is in off-position, spool (10) and armature (15) are located at right end, and throttling window is opened, entrance Oil liquid can flow through solenoid valve to plunger shaft；When electromagnet (16) obtains electric, spool (10) and armature (15) are located at most left by actuation End, throttle close, and the oil liquid of plunger shaft enters oil return opening fuel tank under the action of load force；

The spring-damp system (7) includes spring (19) and damper (18), and spring (19) is wound on the outside of damper (18), when When electromagnetic valve components (3) are in attracting state, the intracavitary oil liquid of spring-damp system (7) is communicated with oil return opening, the oil of plunger shaft Liquid spring (19) of compressed spring damping system (7) to the right under the action of load force, forms a cavity A, in plunger shaft Oil liquid flow to cavity A, so that piston rod executing agency be made to move.

2. the executing agency of high response long-life high reliability according to claim 1, which is characterized in that the spool (10) the slide valve pair formed between valve body (2) is used is arranged convex shoulder+flat seal frame mode, valve among spool (10) During the motion, by the convex shoulder limit on valve body (2), the right is limited core (10) by valve seat (9) on the left side.

3. the executing agency of high response long-life high reliability according to claim 1, which is characterized in that the electromagnet (16) it is composed of the direct wound around coil of " E " type structure iron core.

4. the executing agency of high response long-life high reliability according to claim 3, which is characterized in that working normally When electromagnet (16) be wet type state, the high pressure oil of entrance passes through gap between shell (1) and valve body (2) and valve body (2) to the cooling circuit on oil return opening (8), electromagnet (16) internal coil and iron core is immersed.

5. the executing agency of high response long-life high reliability according to claim 1, which is characterized in that the controller (17) include a communication interface, pass through RS485 or CAN bus and higher level's signal communication.

6. the executing agency of high response long-life high reliability according to claim 5, which is characterized in that controller (17) The control mode of pulsewidth modulation is taken, provides voltage signal for electromagnet (16).