Differential quick-closing hydraulic servo-motor provided with redundant quick-closing electromagnetic valve

Abstract

The utility model discloses a differential quick-closing hydraulic servo-motor provided with a redundant quick-closing electromagnetic valve, and relates to the technical field of steam turbines. The integrated structure is composed of an integrated block, a first quick-closing electromagnetic valve, a second quick-closing electromagnetic valve, a servo valve, an unloading valve, a filter assembly, a safety oil one-way valve, three pressure measuring connectors, an oil return port T connector, a safety oil port P3 connector, an oil return one-way valve, a hydraulic control valve, a pressure oil port P connector and a process plug. The oil cylinder structure is composed of an oil cylinder body, a connecting rod, a pin shaft, a connecting plate, an LVDT displacement sensor, a scaleplate, a pointer, a junction box, a roller, a limiting sleeve and the like. According to the differential motion quick-closing hydraulic servo-motor with the redundant quick-closing electromagnetic valves, the first quick-closing electromagnetic valve and the second quick-closing electromagnetic valve which are connected in parallel are arranged through the hydraulic servo-motor and are arranged in a mutually redundant mode; the safety oil pressure of the upper cavity of the unloading valve can be relieved, the hydraulic servo-motor is closed, it is guaranteed that when one electromagnetic valve fails, the other electromagnetic valve can act, and the system safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steam turbine technical field, concretely is a differential quick closing oil motor of configuration redundancy quick closing electromagnetic valve. BACKGROUND

[0002] At present, in order to guarantee the safety of steam turbine unit, the oil motor quick closing time is required to be separated on the one side of oil inlet and the other side of oil discharge, which will lead to no back pressure on the closing side of oil motor, too fast closing speed to damage the valve or other connecting parts, and less than 0.5s to guarantee the safety of steam turbine unit and prevent the overspeed of steam turbine. The commonly used oil motor is provided with one quick closing electromagnetic valve, the oil pressure in the upper chamber of unloading valve is unloaded quickly when the quick closing valve acts, and the oil motor is quickly closed after the unloading valve acts. The above technology has the following shortcomings: the existing oil motor is provided with one quick closing electromagnetic valve, which can meet the needs of steam turbine control system under normal circumstances. However, impurities, metal particles, a small amount of water and acid often exist in the steam turbine oil system, which can cause the quick closing electromagnetic valve to jam and corrode in long-term operation, so that the quick closing electromagnetic valve cannot normally act and cannot realize the quick closing function. Once the consequence occurs, it will be very serious, and even can lead to the flywheel accident of steam turbine, therefore the differential quick closing oil motor of configuration redundancy quick closing electromagnetic valve is provided. SUMMARY

[0003] In view of the defects of the prior art, the utility model provides a differential quick closing oil motor of configuration redundancy quick closing electromagnetic valve, which solves the problems in the above background technology.

[0004] To achieve the above purpose, the utility model realizes the following technical scheme: a differential quick closing oil motor of configuration redundancy quick closing electromagnetic valve, which comprises an integrated structure and an oil cylinder structure, the integrated structure is composed of an integrated block, a first quick closing electromagnetic valve, a second quick closing electromagnetic valve, a servo valve, an unloading valve, a filter assembly, a safety oil check valve, three pressure measuring connectors, a return oil port T connector, a safety oil port P3 connector, a return oil check valve, a hydraulic control valve, a pressure oil port P connector and a process plug, and the oil cylinder structure is composed of an oil cylinder body, a connecting rod, a pin shaft, a connecting plate, an LVDT displacement sensor, a scale, a pointer, a junction box, a roller and a limiting sleeve, and the integrated block is fixed on the oil cylinder body by screws.

[0005] Preferably, O-rings for sealing oil are installed between the integrated block and the oil cylinder body.

[0006] Preferably, the first quick closing electromagnetic valve, the second quick closing electromagnetic valve, the servo valve, the unloading valve, the filter assembly, the safety oil check valve and the return oil check valve are fixedly installed on the external surface of the integrated block by bolt connection, the three pressure measuring connectors, the return oil port T connector, the safety oil port P3 connector, the hydraulic control valve, the pressure oil port P connector and the process plug are screwed into the inside of the integrated block.

[0007] Preferably, the LVDT displacement sensor is installed on the piston rod in the oil cylinder body through a connecting plate, the pointer and the safety oil check valve are installed on the piston rod in the oil cylinder body through the connecting plate, the scale is installed on the oil cylinder body, the junction box is fixed on the side surface of the oil cylinder body, one end of the connecting rod is screwed on the end of the piston rod in the oil cylinder body, and a pin shaft is arranged in the connecting rod.

[0008] Preferably, the limiting sleeve is arranged in the oil cylinder body.

[0009] Preferably, a plurality of holes of different specifications are formed in the inside of the integrated block.

[0010] The differential quick closing oil actuator with redundant quick closing electromagnetic valves has the following beneficial effects:

[0011] 1. The differential quick closing oil actuator with redundant quick closing electromagnetic valves is provided with the first quick closing electromagnetic valve and the second quick closing electromagnetic valve in parallel through the oil actuator, and the first quick closing electromagnetic valve and the second quick closing electromagnetic valve are redundantly configured, so that the safety oil pressure in the upper chamber of the unloading valve can be unloaded, the oil actuator can be closed, and when one of the electromagnetic valves fails, the other one can act, thereby improving the system safety.

[0012] 2. The differential quick closing oil actuator with redundant quick closing electromagnetic valves is provided with the same pressure oil liquid on the side of the piston rod during the closing process of the oil actuator, and the area difference between the oil inlet and the return oil of the oil actuator is used to ensure that the oil actuator has a constant closing force, so as to avoid impact damage to the valve or the connecting piece during the quick closing process. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a front view structural schematic diagram of the utility model;

[0014] Figure 2 It is a side view structural schematic diagram of the utility model;

[0015] Figure 3 It is a rear view structural schematic diagram of the utility model;

[0016] Figure 4 It is a sectional view structural schematic diagram of the oil cylinder body of the utility model;

[0017] Figure 5 It is a hydraulic principle diagram of the oil actuator of the utility model.

[0018] In the figure: 1, connecting rod; 2, pin shaft; 3, connecting plate; 4, LVDT displacement sensor; 5, integrated block; 6, screw; 7, first quick closing electromagnetic valve; 8, second quick closing electromagnetic valve; 9, servo valve; 10, unloading valve; 11, scale; 12, pointer; 13, junction box; 14, filter assembly; 15, safety oil check valve; 16, pressure tapping; 17, oil cylinder body; 18, roller; 19, limit sleeve; 20, oil return port T joint; 21, safety oil port P3 joint; 22, oil return check valve; 23, hydraulic control valve; 24, pressure oil port P joint. DETAILED DESCRIPTION

[0019] 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.

[0020] Please refer to Figures 1 to 5 The utility model provides a kind of technical solutions: a differential quick closing oil motor of redundant quick closing electromagnetic valve, including integrated structure and oil cylinder structure, integrated structure is by integrated block 5, first quick closing electromagnetic valve 7, second quick closing electromagnetic valve 8, servo valve 9, unloading valve 10, filter assembly 14, safety oil check valve 15, three pressure taps 16, oil return port T joint 20, safety oil port P3 joint 21, oil return check valve 22, hydraulic control valve 23, pressure oil port P joint 24 and process plug are constituted, oil cylinder structure is by oil cylinder body 17, connecting rod 1, pin shaft 2, connecting plate 3, LVDT displacement sensor 4, scale 11, pointer 12, junction box 13, roller 18 and limit sleeve 19 etc. are constituted, integrated block 5 is fixed on oil cylinder body 17 by screw 6.

[0021] O-ring for sealing oil is installed between integrated block 5 and oil cylinder body 17.

[0022] First quick closing electromagnetic valve 7, second quick closing electromagnetic valve 8, servo valve 9, unloading valve 10, filter assembly 14, safety oil check valve 15 and oil return check valve 22 are all fixedly installed on the external surface of integrated block 5 by bolt connection, three pressure taps 16, oil return port T joint 20, safety oil port P3 joint 21, hydraulic control valve 23, pressure oil port P joint 24 and process plug are all screwed into integrated block 5 inside by thread.

[0023] LVDT displacement sensor 4 is installed on the piston rod in the oil cylinder body 17 through the connecting plate 3, for transmitting the position signal of the oil motor to the control system; pointer 12, safety oil check valve 15 are installed on the piston rod in the oil cylinder body 17 through the connecting plate 3, cooperate with the scale 11 installed on the oil cylinder body 17 to display the position of the oil motor; the junction box 13 is fixed on the side of the oil cylinder body 17, which is convenient for electrical equipment wiring; one end of the connecting rod 1 is screwed on the end of the piston rod in the oil cylinder body 17, and the pin shaft 2 is arranged in the connecting rod 1 to stop rotation.

[0024] The limiting sleeve 19 is installed in the oil cylinder body 17, which is used to adjust the stroke of the oil cylinder, and the other end of the connecting rod 1 is connected with the connecting rod on the valve side.

[0025] The integrated block 5 is internally provided with a plurality of holes of different specifications, and the plurality of holes can be connected according to the principle of the hydraulic schematic diagram, so as to realize the required function of the oil motor.

[0026] In summary, the differential quick closing oil motor with redundant quick closing electromagnetic valve is used as follows:

[0027] When the oil motor is running normally, first, the pressure oil enters the oil motor through the pressure oil port P connector 24, and the safety oil is established through the φ1.0 throttle hole, and the safety oil enters the upper chamber X chamber in the unloading valve 10 through the first quick closing electromagnetic valve 7 and the second quick closing electromagnetic valve 8 in the power-off P port through A port state, and at the same time, the control hydraulic valve 23 enters the bidirectional conduction state, then when the servo valve 9 is powered on and reversed to A port through T port state, the rodless cavity of the oil motor is opened; when the servo valve 9 is reversed to P port through A port state, the rodless cavity of the oil motor is closed, and when the servo valve 9 is reversed to the middle position, the oil motor can be stably running at any position, during the process of the servo valve 9 controlling the opening and closing of the oil motor, the LVDT displacement sensor 4 and the pointer 12 extend or retract with the piston rod of the oil cylinder body 17, and remotely or locally indicate the position of the oil motor;

[0028] The action relationship of the quick closing of the oil motor: when the oil motor is quickly closed, during the operation of the steam turbine unit and the oil motor, when a critical working condition is encountered, the steam turbine control system receives a dangerous signal, and the first quick closing electromagnetic valve 7 and the second quick closing electromagnetic valve 8 are electrified, so that the first quick closing electromagnetic valve 7 and the second quick closing electromagnetic valve 8 are switched to the state of A port communicating with T port, the safety oil of the hydraulic control valve 23 is discharged, so that the hydraulic control valve 23 is in the state of one-way oil communication, the rodless cavity of the oil motor is sealed, at the same time, the safety oil pressure of the upper cavity X cavity of the unloading valve 10 is discharged, so that the pressure oil of the A cavity is quickly introduced into the B cavity, the rodless cavity of the oil motor is quickly filled, because the force area of the piston of the rodless cavity is larger than the area of the rod cavity, so the oil motor can be quickly closed under the constant closing force, after the oil motor is closed, the piston rods in the oil cylinder body 17 are all extended, the LVDT displacement sensor 4 and the pointer 12 follow the action of the piston rods in the oil cylinder body 17 to the zero position of the oil motor, the LVDT displacement sensor 4 remotely feeds back the control system that the oil motor has reached the full closing position, and the system can perform subsequent operations.

[0029] The above merely describes a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited to this. 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, and all of them should be covered in the protection scope of the present application.

Claims

1. A differential quick closing oil motor for configuring a redundant quick closing solenoid valve, characterized by: Integrated structure and oil cylinder structure, the integrated structure is composed of integrated block (5), first fast closing electromagnetic valve (7), second fast closing electromagnetic valve (8), servo valve (9), unloading valve (10), filter assembly (14), safety oil check valve (15), three pressure taps (16), oil return port T joint (20), safety oil port P3 joint (21), oil return check valve (22), hydraulic control valve (23), pressure oil port P joint (24) and process plug, the oil cylinder structure is composed of oil cylinder body (17), connecting rod (1), pin shaft (2), connecting plate (3), LVDT displacement sensor (4), scale (11), pointer (12), junction box (13), roller (18) and limit sleeve (19), the integrated block (5) is fixed on the oil cylinder body (17) by screw (6).

2. A differential quick closing oil motor for configuring a redundant quick closing solenoid valve according to claim 1, characterized in that: O-ring for sealing oil is installed between the integrated block (5) and the oil cylinder body (17).

3. A differential quick closing oil motor for configuring a redundant quick closing solenoid valve according to claim 1, characterized in that: The first fast closing electromagnetic valve (7), the second fast closing electromagnetic valve (8), the servo valve (9), the unloading valve (10), the filter assembly (14), the safety oil check valve (15) and the oil return check valve (22) are all fixed and installed on the outer surface of the integrated block (5) by bolt connection, the three pressure taps (16), the oil return port T joint (20), the safety oil port P3 joint (21), the hydraulic control valve (23), the pressure oil port P joint (24) and the process plug are all screwed into the inside of the integrated block (5).

4. The differential quick closing oil motor for configuring a redundant quick closing solenoid valve according to claim 1, wherein: The LVDT displacement sensor (4) is installed on the piston rod in the oil cylinder body (17) through the connecting plate (3), the pointer (12) and the safety oil check valve (15) are both installed on the piston rod in the oil cylinder body (17) through the connecting plate (3), the scale (11) is installed on the oil cylinder body (17), the junction box (13) is fixed on the side of the oil cylinder body (17), one end of the connecting rod (1) is screwed on the end of the piston rod in the oil cylinder body (17), and the pin shaft (2) is arranged in the connecting rod (1).

5. The differential quick closing oil motor for configuring a redundant quick closing solenoid valve according to claim 1, wherein: The limit sleeve (19) is installed in the oil cylinder body (17).

6. A differential quick closing oil motor for configuring a redundant quick closing solenoid valve according to claim 1, characterized in that: A plurality of holes of different specifications are formed in the integrated block (5).

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