CN201259004Y - Control module of bypass pressure-reducing and desuperheating valve actuating mechanism - Google Patents

Abstract

The invention relates to a control module of an actuator of a high-side temperature and pressure reduction valve, which relates to the technical field of hydraulic control and solves the technical problem of coexistence of two-position control and continuous control in hydraulic control. The module includes an electrical control unit, a hydraulic control unit, and an oil cylinder for controlling the controlled valve. The hydraulic control unit is provided with a pressure oil port and an oil return port. It is characterized in that the oil cylinder is a piston with two working chambers Type oil cylinder, the control oil circuit of the hydraulic control unit is divided into two circuits, one path starts from the pressure oil port and connects the two working chambers of the oil cylinder through a fast control solenoid valve and a hydraulic control check valve, and the other path starts from the pressure oil port The two working chambers of the oil cylinder are connected through an electro-hydraulic servo valve. The quick-control solenoid valve and the electro-hydraulic servo valve are controlled by the electric control unit. The oil cylinder is equipped with a displacement sensor for feedback to the electric control unit to be controlled Valve position signal. By using the control module provided by the utility model, the coexistence of two-position control and continuous control can be realized.

Description

The control module of the actuator of the high side desuperheating and pressure reducing valve

technical field

The utility model relates to a hydraulic control technology, in particular to a technology of a control module of an actuator of a high-side temperature and pressure reduction valve.

Background technique

There are two types of traditional valve actuator control: on-off type and regulating type. flow area. However, the high-side temperature and pressure reduction valves of coal-fired steam turbines not only need to be opened and closed quickly, but also need to be positioned correctly at any position and continuously controlled according to input instructions. Therefore, the above two control methods cannot be applied to high-side valves. Temperature and pressure reducing valve.

Utility model content

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the utility model is to provide a control module suitable for the actuator of the high side temperature and pressure reducing valve, which can adopt the two-position control mode and the continuous control mode .

In order to solve the above technical problems, the utility model provides a control module for the actuator of the high-side temperature and pressure reducing valve, which includes an electrical control unit, a hydraulic control unit, and an oil cylinder for controlling the controlled valve. The hydraulic control unit It is equipped with a pressure oil port and an oil return port, and the feature is that the oil cylinder is a piston type oil cylinder with two working chambers, and the control oil circuit of the hydraulic control unit is divided into two paths, one path starts from the pressure oil port and passes through a fast The two working chambers of the oil cylinder are connected by a solenoid valve and a hydraulically controlled one-way valve, and the other is connected from the pressure oil port to the two working chambers of the oil cylinder through an electro-hydraulic servo valve. The hydraulically controlled one-way valve, electro-hydraulic servo Each valve has two load ports. The quick-control solenoid valve and the electro-hydraulic servo valve are controlled by an electric control unit. The oil cylinder is provided with a displacement sensor for feeding back the valve position signal of the controlled valve to the electric control unit.

Further, a cut-off valve is provided in the connecting oil circuit between each load port of the electro-hydraulic servo valve and the working chamber of the oil cylinder, and all the cut-off valves are opened and closed synchronously by a locking electromagnetic valve, and the locking electromagnetic valve is controlled by the electric control unit To control its work, its oil inlet is connected to the pressure oil port.

Further, the pressure oil port is provided with an oil filter.

The control module of the high-side temperature and pressure reduction valve actuator provided by the utility model is divided into two circuits because the control oil circuit of the oil cylinder is divided into two circuits. The continuous control method is adopted, which is realized by the electro-hydraulic servo valve and the displacement sensor, so the two-position control method and the continuous control method can be adopted, and it is suitable for the actuator of the high-side temperature and pressure reduction valve.

Description of drawings

Fig. 1 is a hydraulic diagram of the control module of the high side temperature and pressure reducing valve actuator of the embodiment of the present invention.

Detailed ways

The embodiments of the present utility model are described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present utility model. All similar structures and similar changes of the utility model should be included in the protection of the utility model. scope.

As shown in Figure 1, the control module of a high-side temperature and pressure reduction valve actuator provided by the embodiment of the present invention includes an electrical control unit 11, a hydraulic control unit, and an oil cylinder 7 for controlling the controlled valve 12, The hydraulic control unit is provided with a pressure oil port P and an oil return port T. It is characterized in that: the oil cylinder 7 is a piston type oil cylinder with two working chambers, and the control oil circuit of the hydraulic control unit is divided into two paths, one path From the pressure oil port P, connect the two working chambers of the oil cylinder 7 through a quick-control solenoid valve 1 and a hydraulic control check valve 8, and connect the two working chambers of the oil cylinder 7 from the pressure oil port P through an electro-hydraulic servo valve 3. Two working chambers, the hydraulic control check valve 8 and the electro-hydraulic servo valve 3 both have two load ports, the fast-control solenoid valve 1 and the electro-hydraulic servo valve 3 are controlled by an electric control unit 11, and the oil cylinder 7 is provided with a displacement sensor 6, which is used to feed back the valve position signal of the controlled valve 12 to the electric control unit 11.

Each load port of the electro-hydraulic servo valve 3 is provided with cut-off valves 9 and 10 in the connecting oil passage of the working chamber of the oil cylinder 7, which are used to block the working oil passage, thereby locking the oil cylinder 7. All the cut-off valves are controlled by a locking electromagnetic The valve 2 is controlled to open and close synchronously, and the operation of the locking solenoid valve 2 is controlled by the electric control unit 11 , and its oil inlet is connected to the pressure oil port P.

The pressure oil port P is provided with an oil filter 4 to ensure that the hydraulic oil entering each valve is kept clean.

The pressure oil port P is provided with a differential pressure indicator 5 for indicating the clogging degree of the oil filter 4 .

When the controlled valve 12 is normally adjusted, the valve position command is input to the electric control unit 11, and the electric control unit 11 first detects the valve position signal of the controlled valve 12 fed back by the displacement sensor 6, and then according to the difference between the valve position signal and the valve position command Send the working command of opening or closing the valve to the electro-hydraulic servo valve 3. The electro-hydraulic servo valve 3 converts the electrical signal into a hydraulic signal and amplifies it and sends it to the corresponding working chamber of the cylinder 7, thereby driving the piston of the cylinder to move, and the piston drives the received The control valve 12 works, and at the same time drives the displacement sensor 6 to work, and the displacement sensor 6 feeds back the valve position signal to the electrical control unit 11 until the valve position signal and the valve position command are balanced, so that the controlled valve 12 is adjusted to the required opening. Degree, to achieve valve position control.

Since the electro-hydraulic servo valve 3 is provided with a mechanical bias, the controlled valve 12 will stop at a predetermined safe position after the electro-hydraulic servo valve 3 loses the working signal.

When the controlled valve 12 opens or closes quickly, input a quick opening or closing command to the electrical control unit 11, and the electrical control unit 11 sends a corresponding command to the quick control solenoid valve 1, and the quick control solenoid valve 1 converts the electrical signal into a hydraulic signal After that, it is sent to the corresponding working chamber of the oil cylinder 7 through the hydraulic control check valve 8, thereby driving the piston of the oil cylinder to move quickly, and the piston drives the controlled valve 12 to open or close quickly.

When the controlled valve 12 needs to be positioned, input a positioning command to the electrical control unit 11, and the electrical control unit 11 sends a positioning command to the blocking solenoid valve 2, and the blocking solenoid valve 2 converts the electrical signal into a hydraulic signal and then controls the stop valve 9, 10 to block The working oil circuit locks the oil cylinder 7 so that the controlled valve 12 is locked at the current position.

Claims (3)

1. A control module for an actuator of a high-side temperature and pressure reduction valve, including an electrical control unit, a hydraulic control unit, and an oil cylinder for controlling a controlled valve. The hydraulic control unit is provided with a pressure oil port and an oil return port, It is characterized in that: the oil cylinder is a piston type oil cylinder with two working chambers, the control oil circuit of the hydraulic control unit is divided into two circuits, one path starts from the pressure oil port and passes through a quick control solenoid valve and a hydraulic control check valve. Connect the two working chambers of the oil cylinder, and the other way connects the two working chambers of the oil cylinder from the pressure oil port through an electro-hydraulic servo valve. Both the hydraulic control check valve and the electro-hydraulic servo valve have two load ports. The operation of the quick-control solenoid valve and the electro-hydraulic servo valve is controlled by the electric control unit, and the oil cylinder is provided with a displacement sensor for feeding back the valve position signal of the controlled valve to the electric control unit. 2. The control module of the actuator of the high-side temperature and pressure reduction valve according to claim 1, characterized in that: a cut-off valve is provided in the oil passage connecting each load port of the electro-hydraulic servo valve and the working chamber of the oil cylinder , all the shut-off valves are opened and closed synchronously under the control of a blocking solenoid valve, and the operation of the blocking solenoid valve is controlled by an electric control unit, and its oil inlet is connected to the pressure oil port. 3. The control module of the actuator of the high side temperature and pressure reduction valve according to claim 1, wherein the pressure oil port is provided with an oil filter.

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