Regulating valve actuating mechanism with high back pressure

Abstract

The utility model discloses a regulating valve actuating mechanism with high back pressure, which relates to the technical field of hydraulic servo-motor control and comprises a pull rod, a joint bearing, a displacement sensor, an oil cylinder component, a control manifold block, an electromagnetic valve, a servo valve, an unloading valve, a pin shaft and a guide rail. The knuckle bearing is in threaded connection with the oil cylinder assembly, the displacement sensor is installed on the oil cylinder assembly through threads, the surface of the oil cylinder assembly is connected with a control oil path block through an inner hexagon screw, and the surface of the control oil path block is connected with an electromagnetic valve through an inner hexagon screw. The unloading valve is arranged, the structure of the unloading valve is improved, and the area ratio of the unloading valve is increased, so that the pressure difference value of the upper cavity and the lower cavity of the unloading valve is increased to 2 MPa or above, and the problems that a hydraulic servo-motor cannot act and internal leakage is caused due to the differential pressure value problem of the unloading valve of a differential actuating mechanism are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil motor control technical field, concretely is a kind of regulating valve actuator of high back pressure. BACKGROUND

[0002] Regulating valve actuator is servo type actuator, and the opening of oil motor is automatically controlled in closed loop by servo valve and displacement sensor.In the process of unit operation, in order to ensure the safety of unit operation, emergency shutdown operation is needed when emergency occurs in unit, thus a large-diameter unloading valve is needed in the oil circuit of actuator, to realize the function of quick closing of actuator.

[0003] The existing differential servo type actuator often appears the situation that servo actuator does not act or the situation that large leakage occurs in actuator during actuation due to unloading valve back pressure problem, and the maximum back pressure of commonly used DN25 unloading valve on the market is only 0.4MPa, which still cannot meet the use requirement of differential servo type actuator, and the above situation often occurs, which causes great hidden danger to unit operation and is difficult to troubleshoot. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies of prior art, the utility model provides a kind of regulating valve actuator of high back pressure, to solve the problems raised in the above background.

[0005] To achieve the above purpose, the utility model is realized by the following technical scheme: a kind of regulating valve actuator of high back pressure, including pull rod, joint bearing, displacement sensor, oil cylinder assembly, control oil circuit block, solenoid valve, servo valve, unloading valve, pin shaft and guide rail, the pull rod is connected with joint bearing by shaft pin, the joint bearing is screwed on oil cylinder assembly, the displacement sensor is installed on oil cylinder assembly by screw thread, the surface of oil cylinder assembly is connected with control oil circuit block by internal hexagon screw, the surface of control oil circuit block is connected with solenoid valve by internal hexagon screw, the servo valve is installed on control oil circuit block by internal hexagon screw, the unloading valve is installed on control oil circuit block by internal hexagon screw, the pin shaft and guide rail are connected with oil cylinder assembly by internal hexagon screw.

[0006] Preferably, the surface of control oil circuit block is installed with hydraulic control check valve, and the surface of control oil circuit block and above hydraulic control check valve are installed with return oil check valve.

[0007] Preferably, the control oil circuit block, solenoid valve, servo valve, unloading valve, hydraulic control check valve and return oil check valve constitute oil circuit.

[0008] Preferably, the unloading valve is composed of a valve cover, a spring, a first sealing ring, a second sealing ring, a valve sleeve, a valve core and a third sealing ring, the unloading valve is internally provided with the valve sleeve, the valve sleeve is internally provided with the valve core, the surface of the unloading valve is provided with the valve cover, and the valve cover is provided with the spring between the valve core.

[0009] Preferably, the first sealing ring is arranged between the valve cover and the valve sleeve, the second sealing ring is arranged between the valve sleeve and the unloading valve, and the third sealing ring is arranged between the valve sleeve and the unloading valve.

[0010] Preferably, the third sealing ring is arranged in the lower cavity of the unloading valve, and the oil cylinder assembly is arranged in the upper cavity of the unloading valve.

[0011] The utility model provides a regulating valve actuating mechanism of high back pressure has the following beneficial effects:

[0012] 1. The regulating valve actuating mechanism of high back pressure, through be provided with unloading valve, improve the structure of unloading valve, increase unloading valve area ratio, thereby realize unloading valve upper and lower cavity's pressure difference value improves to 2MPa above, further solve the problem of oil motor unable action and internal leakage caused by the problem of unloading valve pressure difference value of differential type actuating mechanism.

[0013] 2. The regulating valve actuating mechanism of high back pressure, the unloading valve upper cavity is provided with control oil through the reversing of solenoid valve, and this is equivalent to the unloading valve upper cavity control oil is a way of pilot oil, so as to ensure that when the system needs emergency shutdown, only needs the solenoid valve reversing to be able to cut off control oil quickly, thereby realizing the quick response of the execution structure. DRAWINGS

[0014] Figure 1 It is the front view structural schematic diagram of the utility model;

[0015] Figure 2 It is the right view structural schematic diagram of the utility model;

[0016] Figure 3 It is the left view structural schematic diagram of the utility model;

[0017] Figure 4 It is the overhead view structural schematic diagram of the utility model;

[0018] Figure 5 It is the internal structure schematic diagram of the unloading valve of the utility model;

[0019] Figure 6 It is the hydraulic principle diagram of the utility model.

[0020] In the figure: 1, pull rod; 2, joint bearing; 3, displacement sensor; 4, oil cylinder assembly; 5, control oil path block; 6, electromagnetic valve; 7, servo valve; 8, unloading valve; 9, pin shaft; 10, guide rail; 11, hydraulic control check valve; 12, oil return check valve; 13, valve cover; 14, spring; 15, first sealing ring; 16, second sealing ring; 17, valve sleeve; 18, valve core; 19, third sealing ring. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0022] Please refer to Figures 1 to 5 The utility model provides a kind of technical solutions: a regulating valve actuator with high back pressure, including pull rod 1, joint bearing 2, displacement sensor 3, oil cylinder assembly 4, control oil path block 5, electromagnetic valve 6, servo valve 7, unloading valve 8, pin shaft 9 and guide rail 10, pull rod 1 is connected by shaft pin between joint bearing 2, joint bearing 2 is screwed on oil cylinder assembly 4, displacement sensor 3 is installed by screw on oil cylinder assembly 4, control oil path block 5 is connected by internal hexagon screw on the surface of oil cylinder assembly 4, electromagnetic valve 6 is connected by internal hexagon screw on the surface of control oil path block 5, servo valve 7 is installed by internal hexagon screw on control oil path block 5, unloading valve 8 is installed by internal hexagon screw on control oil path block 5, pin shaft 9 and guide rail 10 are connected by internal hexagon screw with oil cylinder assembly 4, pull rod 1, joint bearing 2, oil cylinder assembly 4 are connected by hinge, to realize that the actuator does not need too high coaxial degree requirement in connecting process, reduce installation difficulty, unloading valve 8 is to realize that unit overspeed stops, since there is certain area difference between upper cavity and lower cavity of unloading valve 8, to ensure that unloading valve 8 can generate nearly 2MPa pressure difference value.When the pressure difference between upper cavity pressure and lower cavity pressure in unloading valve 8 is more than 2MPa, unloading valve 8 opens rapidly, at this time, actuator is quickly closed, the combination of servo valve 7 and displacement sensor 3 is to realize the automatic regulation of actuator, and displacement sensor 3 is redundantly arranged, avoid the problem that system cannot be closed loop regulated due to displacement sensor 3 damage.

[0023] The surface of the control oil passage block 5 is provided with a hydraulic control check valve 11, and the surface of the control oil passage block 5 and above the hydraulic control check valve 11 is provided with a return oil check valve 12. The control oil passage block 5, the electromagnetic valve 6, the servo valve 7, the unloading valve 8, the hydraulic control check valve 11 and the return oil check valve 12 form an oil passage. The servo valve 7 is a proportional reversing valve. The servo valve 7 is closed-loop controlled with the displacement sensor 3. The given command opening degree is compared with the actual displacement opening degree, and then adjusted, so as to realize automatic adjustment of the valve opening degree of the actuator. The unloading valve 8 is composed of a valve cover 13, a spring 14, a first sealing ring 15, a second sealing ring 16, a valve sleeve 17, a valve core 18 and a third sealing ring 19. The unloading valve 8 is internally provided with the valve sleeve 17. The valve sleeve 17 is internally provided with the valve core 18. The surface of the unloading valve 8 is provided with the valve cover 13. The valve cover 13 and the valve core 18 are provided with the spring 14. The valve cover 13 and the valve sleeve 17 are provided with the first sealing ring 15. The valve sleeve 17 and the unloading valve 8 are provided with the second sealing ring 16. The valve sleeve 17 and the unloading valve 8 are provided with the third sealing ring 19. The third sealing ring 19 is located in the lower cavity of the unloading valve 8. The oil cylinder assembly 4 is located in the upper cavity of the unloading valve 8. The oil cylinder assembly 4 is guided by the pin shaft 9 and the guide rail 10 during movement, so as to avoid rotation of the actuator during movement.

[0024] In summary, the high back pressure adjusting valve actuator divides the pressure oil into four paths through the four paths in the control oil passage block 5. One path is connected to the rod cavity in the oil cylinder assembly 4, as the power oil of the upper cavity of the oil cylinder assembly 4. Another path is connected to the upper cavity control oil OPC of the unloading valve 8 through the electromagnetic valve 6. One path is connected to the rodless cavity in the oil cylinder assembly 4 through the servo valve 7, so as to control the oil inlet amount of the rodless cavity. The last path is connected to the A cavity of the unloading valve 8.

[0025] When the electromagnetic valve 6 is de-energized, the pressure oil passes through the P port to the A port of the electromagnetic valve 6 to generate OPC control oil. The OPC control oil is the control oil of the unloading valve 8, which ensures that the unloading valve 8 is in a closed state. Since there is a certain area difference between the upper cavity and the lower cavity of the unloading valve 8, the unloading valve 8 can generate a differential pressure value of nearly 2 MPa. When the electromagnetic valve 6 is energized, the control oil of the unloading valve 8 is blocked, and the control oil is quickly unloaded through the return port of the electromagnetic valve 6. At this time, the unloading valve 8 is opened. The rod cavity and the rodless cavity in the oil cylinder assembly 4 are quickly connected. Due to the direct area difference of the cavities in the oil cylinder assembly 4, the oil cylinder assembly 4 is quickly extended and moves to the closing direction. The closing time is less than 0.3 seconds.

[0026] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A high back pressure control valve actuator characterized by: It includes pull rod (1), joint bearing (2), displacement sensor (3), oil cylinder assembly (4), control oil circuit block (5), electromagnetic valve (6), servo valve (7), unloading valve (8), pin shaft (9) and guide rail (10), the pull rod (1) and joint bearing (2) are connected by shaft pin, the joint bearing (2) is screwed on the oil cylinder assembly (4), the displacement sensor (3) is installed on the oil cylinder assembly (4) by screw thread, the oil cylinder assembly (4) surface is connected with control oil circuit block (5) by internal hexagon screw, the control oil circuit block (5) surface is connected with electromagnetic valve (6) by internal hexagon screw, the servo valve (7) is installed on the control oil circuit block (5) by internal hexagon screw, the unloading valve (8) is installed on the control oil circuit block (5) by internal hexagon screw, the pin shaft (9) and guide rail (10) are connected with oil cylinder assembly (4) by internal hexagon screw.

2. A high back pressure control valve actuator according to claim 1 wherein: The control oil circuit block (5) surface is installed with hydraulic control check valve (11), the control oil circuit block (5) surface and above hydraulic control check valve (11) is installed with oil return check valve (12).

3. A high back pressure control valve actuator according to claim 1 wherein: The control oil circuit block (5), electromagnetic valve (6), servo valve (7), unloading valve (8), hydraulic control check valve (11) and oil return check valve (12) constitute oil circuit.

4. The high back pressure control valve actuator of claim 1 wherein: The unloading valve (8) is composed of valve cover (13), spring (14), first sealing ring (15), second sealing ring (16), valve sleeve (17), valve core (18) and third sealing ring (19), the unloading valve (8) is installed with valve sleeve (17) inside, the valve sleeve (17) is provided with valve core (18) inside, the surface of unloading valve (8) is installed with valve cover (13), the spring (14) is installed between valve cover (13) and valve core (18).

5. A high back pressure control valve actuator according to claim 4 wherein: The first sealing ring (15) is installed between the valve cover (13) and the valve sleeve (17), the second sealing ring (16) is installed between the valve sleeve (17) and the unloading valve (8), and the third sealing ring (19) is installed between the valve sleeve (17) and the unloading valve (8).

6. A high back pressure control valve actuator according to claim 4 wherein: The third sealing ring (19) is located in the lower cavity of the unloading valve (8), and the oil cylinder assembly (4) is located in the upper cavity of the unloading valve (8).

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