Proportional reversing system for preventing clamping stagnation of valve element and hydroelectric power generation speed regulator

Abstract

The proportional reversing system comprises an oil source reversing valve, a proportional reversing valve and an action oil cylinder, a first oil inlet of the oil source reversing valve is connected with pressure oil, a first oil return opening of the oil source reversing valve is connected with an oil tank, a first working oil opening of the oil source reversing valve is connected with a second oil inlet of the proportional reversing valve, and a second working oil opening of the proportional reversing valve is connected with a second oil return opening of the action oil cylinder. Before the proportional reversing valve is operated, the oil source reversing valve is switched to a first working position, the first oil inlet is communicated with the first working oil port, after the proportional reversing valve is operated, the oil source reversing valve is switched to a second working position, and the first oil return port is communicated with the first working oil port. An amplifier does not need to be arranged to increase a certain amount of vibration and amplitude, pressure oil and the proportional reversing valve are isolated through the oil source reversing valve, clamping stagnation caused by the fact that the proportional reversing valve is not moved for a long time is prevented, the reliability and performance of a system are guaranteed, and the performance and the service life of the valve are improved. The utility model further discloses a hydroelectric power generation speed regulator comprising the proportional reversing system capable of preventing the valve element from clamping stagnation.

Description

Technical Field

[0001] The utility model relates to the field of electric power equipment, in particular to a proportional reversing system for preventing valve core from being stuck. In addition, the utility model also relates to a hydraulic power generation speed regulator comprising the proportional reversing system for preventing valve core from being stuck. Background Art

[0002] Proportional reversing valves are increasingly used in speed regulators of hydroelectric power stations and play an important role in the working process. However, in actual use, if the proportional reversing valve does not move for a long time and the pressure oil pushes the proportional reversing valve for a long time, the valve core will become stuck, causing the proportional reversing valve to fail to operate normally, ultimately affecting the normal use of the equipment.

[0003] In order to prevent the proportional reversing valve from getting stuck, the amplifier needs to add a certain amount of vibration and amplitude to prevent the proportional valve from getting stuck due to long-term inactivity. The amplifier cannot be powered off for too long, and the vibration frequency and amplitude parameters must match. If the set parameters do not match, it will affect the reliability and performance of the system. If the system is powered off for a long time, the amplifier will not be able to send out a vibration signal.

[0004] Therefore, how to provide a proportional reversing system to prevent valve core from getting stuck is a technical problem that those skilled in the art need to solve at present. Utility Model Content

[0005] The purpose of the utility model is to provide a proportional reversing system to prevent valve core from getting stuck, which isolates the pressure oil and the proportional reversing valve through the oil source reversing valve to prevent the proportional reversing valve from getting stuck due to being immobilized for too long, thereby improving the reliability of the system. Another purpose of the utility model is to provide a hydroelectric speed regulator including the proportional reversing system to prevent valve core from getting stuck.

[0006] To solve the above technical problems, the utility model provides a proportional reversing system to prevent valve core from getting stuck, including an oil source reversing valve, a proportional reversing valve and an actuating oil cylinder, wherein the first oil inlet of the oil source reversing valve is connected to the pressure oil, the first oil return port of the oil source reversing valve is connected to the oil tank, the first working oil port of the oil source reversing valve is connected to the second oil inlet of the proportional reversing valve, the second working oil port and the third working oil port of the proportional reversing valve are respectively connected to the two ends of the actuating oil cylinder, before operating the proportional reversing valve, the oil source reversing valve is switched to the first working position, and the first oil inlet is connected to the first working oil port, and after operating the proportional reversing valve, the oil source reversing valve is switched to the second working position, and the first oil return port is connected to the first working oil port.

[0007] Preferably, the oil source reversing valve is a two-position three-way electromagnetic reversing valve.

[0008] Preferably, the proportional reversing valve is a three-position four-way electromagnetic proportional reversing valve.

[0009] Preferably, the second oil return port of the three-position four-way electromagnetic proportional reversing valve is connected to the oil tank.

[0010] Preferably, a controller is further included, wherein the controller is communicatively connected to the oil source reversing valve and the proportional reversing valve, and controls the reversing operation of the oil source reversing valve and the proportional reversing valve.

[0011] Preferably, the controller includes a timing unit. After the operation of the proportional reversing valve is completed, the timing unit sends a signal to the controller after a predetermined time, so that the controller controls the oil source reversing valve to switch from the first working position to the second working position.

[0012] Preferably, a motion sensor is provided on the actuating cylinder, and the motion sensor is communicatively connected to the controller for detecting whether the actuating cylinder has been moved into place.

[0013] Preferably, a displacement sensor is provided on the valve core of the proportional reversing valve, and the displacement sensor is communicatively connected to the control for detecting whether the valve core is stuck.

[0014] Preferably, a separately controlled driver is installed on the proportional reversing valve, and the driver is connected to the valve core and can drive the valve core to move.

[0015] The utility model provides a proportional reversing system for preventing a valve core from getting stuck, comprising an oil source reversing valve, a proportional reversing valve and an actuating oil cylinder, wherein a first oil inlet of the oil source reversing valve is connected to pressure oil, a first oil return port of the oil source reversing valve is connected to an oil tank, a first working oil port of the oil source reversing valve is connected to a second oil inlet of the proportional reversing valve, a second working oil port and a third working oil port of the proportional reversing valve are respectively connected to two ends of the actuating oil cylinder, before operating the proportional reversing valve, the oil source reversing valve is switched to a first working position, and the first oil inlet is connected to the first working oil port, and after operating the proportional reversing valve, the oil source reversing valve is switched to a second working position, and the first oil return port is connected to the first working oil port.

[0016] An oil source reversing valve is installed at the pressure oil inlet of the proportional reversing valve. Before the proportional reversing valve needs to be operated, the oil source reversing valve is switched to the first working position, and the pressure oil enters the second oil inlet of the proportional reversing valve. The proportional reversing valve controls the actuating cylinder. When the actuation is completed, the oil source reversing valve is reset and switched to the second working position to cut off the oil pressure entering the proportional reversing valve and discharge the remaining oil pressure. There is no need to set up an amplifier to increase a certain amount of vibration and amplitude. The pressure oil and the proportional reversing valve are isolated by the oil source reversing valve to prevent the proportional reversing valve from being stuck due to long-term inactivity, thereby ensuring the reliability and performance of the system and improving the performance and service life of the valve.

[0017] The utility model also provides a hydroelectric speed regulator including the above-mentioned proportional reversing system for preventing valve core from getting stuck. Since the above-mentioned proportional reversing system for preventing valve core from getting stuck has the above-mentioned technical effect, the above-mentioned hydroelectric speed regulator should also have the same technical effect, which will not be introduced in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model provides a hydraulic principle diagram of a specific implementation of the proportional reversing system for preventing valve core from getting stuck.

[0019] Among them, the oil source reversing valve 1, the first oil inlet P1, the first oil return port T1, the first working oil port A1, the proportional reversing valve 2, the second oil inlet P2, the second oil return port T2, the second working oil port A2, the third working oil port B2, and the actuating cylinder 3. DETAILED DESCRIPTION

[0020] The core of the utility model is to provide a proportional reversing system to prevent valve core from getting stuck, which isolates the pressure oil and the proportional reversing valve through the oil source reversing valve to prevent the proportional reversing valve from getting stuck due to being immobilized for too long, thereby improving the reliability of the system. Another core of the utility model is to provide a hydroelectric speed regulator including the proportional reversing system to prevent valve core from getting stuck.

[0021] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Please refer to Figure 1 , Figure 1 The utility model provides a hydraulic principle diagram of a specific implementation of the proportional reversing system for preventing valve core from getting stuck.

[0023] The specific implementation of the utility model provides a proportional reversing system to prevent valve core from getting stuck, including an oil source reversing valve 1, a proportional reversing valve 2 and an actuating oil cylinder 3, wherein the oil pump provides pressure oil, the oil source reversing valve 1 is provided with a first oil inlet P1, a first oil return port T1 and a first working oil port A1, the proportional reversing valve 2 is provided with a second oil inlet P2, a second oil return port T2, a second working oil port A2 and a third working oil port B2, wherein the first oil inlet P1 of the oil source reversing valve 1 is connected to the pressure oil, The first oil return port T1 of the oil source reversing valve 1 is connected to the oil tank, the first working oil port A1 of the oil source reversing valve 1 is connected to the second oil inlet port P2 of the proportional reversing valve 2, the second working oil port A2 and the third working oil port B2 of the proportional reversing valve 2 are respectively connected to the two ends of the acting cylinder 3, and the oil source reversing valve 1 includes a first working position and a second working position. When it is in the first working position, the first oil inlet port P1 is connected to the first working oil port A1, and when it is in the second working position, the first oil return port T1 is connected to the first working oil port A1.

[0024] Before the action cylinder 3 needs to be actuated, that is, before operating the proportional reversing valve 2, the oil source reversing valve 1 is switched to the first working position, and the pressure oil passes through the first oil inlet P1 and the first working oil port A1 of the oil source reversing valve 1 and enters the second oil inlet P2 of the proportional reversing valve 2. By operating the proportional reversing valve 2, the hydraulic oil enters and exits the two ends of the action cylinder 3 from the second working oil port A2 and the third working oil port B2, so that the action cylinder 3 completes the action. After the action is completed, that is, after operating the proportional reversing valve 2, the oil source reversing valve 1 is switched to the second working position, isolating the pressure oil and the second oil inlet P2 of the proportional reversing valve 2, and cutting off the oil pressure entering the proportional reversing valve 2. At the same time, the hydraulic oil at the second oil inlet P2 flows back to the oil tank through the first working oil port A1 and the first return oil port T1 of the oil source reversing valve 1, and the remaining oil pressure is discharged.

[0025] An oil source reversing valve 1 is installed at the pressure oil inlet of the proportional reversing valve 2. There is no need to set up an amplifier to increase a certain amount of vibration and amplitude. The pressure oil and the proportional reversing valve 2 are isolated by the oil source reversing valve 1. When the proportional reversing valve 2 does not need to be operated, the pressure oil is prevented from being kept at the second oil inlet P2 of the proportional reversing valve 2 for a long time. The pressure oil is discharged in time to prevent the proportional reversing valve 2 from being stuck due to not moving for too long, thereby ensuring the reliability and performance of the system and improving the performance and service life of the valve.

[0026] Specifically, the oil source reversing valve 1 is a two-position three-way electromagnetic reversing valve, and the proportional reversing valve 2 is a three-position four-way electromagnetic proportional reversing valve. The second oil return port T2 of the three-position four-way electromagnetic proportional reversing valve is connected to the oil tank. The control response is timely, and of course other types of valves can be used, and the control mode can also be adjusted, such as hydraulic control, etc., all within the protection scope of the present utility model.

[0027] Based on the proportional reversing system for preventing valve core sticking provided in the above-mentioned specific embodiments, it also includes a controller, which communicates with the oil source reversing valve 1 and the proportional reversing valve 2 and controls the reversing operation of the oil source reversing valve 1 and the proportional reversing valve 2.

[0028] Furthermore, the controller includes a timing unit. After the proportional reversing valve 2 is operated, the timing unit sends a signal to the controller after a predetermined time, so that the controller controls the oil source reversing valve 1 to switch from the first working position to the second working position. That is, after the operation is completed, the oil source reversing valve 1 is reset after a delay, thereby improving the control convenience.

[0029] Preferably, an action sensor is provided on the actuating cylinder 3, and the action sensor is connected to the controller for communication, and is used to detect whether the actuating cylinder 3 is in full action. By providing the action sensor, the action of the actuating cylinder 3 is monitored in real time to ensure the reliability of the equipment. Furthermore, a displacement sensor may be provided on the valve core of the proportional reversing valve 2, and the displacement sensor is connected to the controller for communication, and is used to detect whether the valve core is stuck. It is determined whether the failure of the actuating cylinder 3 to operate normally is caused by the valve core being stuck, and the reliability is further improved. When the oil source lateral valve 1 is actuated and operates the proportional reversing valve 2 to operate, and the displacement of the actuating cylinder 3 does not change, the oil source reversing valve 1 is reset, and the actuation and reset are repeated three times.

[0030] An external drive method can also be used, where a separately controlled driver, such as a motor and a matching transmission mechanism, is installed on the proportional reversing valve 2, and the driver is connected to the valve core and can drive the valve core to move. When the valve core is found to be stuck and cannot be simply reset, the driver moves the valve core to release the stuck state.

[0031] In addition to the above-mentioned proportional reversing system to prevent valve core sticking, the specific implementation of the utility model also provides a hydroelectric speed regulator including the above-mentioned proportional reversing system to prevent valve core sticking. For the structures of other parts of the hydroelectric speed regulator, please refer to the prior art and will not be repeated in this article.

[0032] The above is a detailed introduction to the valve core sticking prevention proportional reversing system and the hydroelectric speed regulator provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A proportional reversing system for preventing valve core from getting stuck, characterized in that: The oil source reversing valve (1) comprises an oil source reversing valve (1), a proportional reversing valve (2) and an actuating oil cylinder (3); the first oil inlet (P1) of the oil source reversing valve (1) is connected to pressure oil, the first oil return port (T1) of the oil source reversing valve (1) is connected to an oil tank, the first working oil port (A1) of the oil source reversing valve (1) is connected to the second oil inlet (P2) of the proportional reversing valve (2), the second working oil port (A2) and the third working oil port (B2) of the proportional reversing valve (2) are respectively connected to two ends of the actuating oil cylinder (3); before operating the proportional reversing valve (2), the oil source reversing valve (1) is switched to a first working position, and the first oil inlet (P1) is connected to the first working oil port (A1); after operating the proportional reversing valve (2), the oil source reversing valve (1) is switched to a second working position, and the first oil return port (T1) is connected to the first working oil port (A1).

2. The proportional reversing system for preventing valve core from sticking according to claim 1, characterized in that: The oil source reversing valve (1) is specifically a two-position three-way electromagnetic reversing valve.

3. The proportional reversing system for preventing valve core from sticking according to claim 2, characterized in that: The proportional directional control valve (2) is specifically a three-position four-way electromagnetic proportional directional control valve.

4. The proportional reversing system for preventing valve core from sticking according to claim 3, characterized in that: The second oil return port (T2) of the three-position four-way electromagnetic proportional reversing valve is connected to the oil tank.

5. The proportional reversing system for preventing valve core from sticking according to any one of claims 1 to 4, characterized in that: It also comprises a controller, which is communicatively connected to the oil source reversing valve (1) and the proportional reversing valve (2) and controls the reversing operation of the oil source reversing valve (1) and the proportional reversing valve (2).

6. The proportional reversing system for preventing valve core from sticking according to claim 5, characterized in that: The controller comprises a timing unit. After the proportional reversing valve (2) is operated, the timing unit sends a signal to the controller after a predetermined time, so that the controller controls the oil source reversing valve (1) to switch from the first working position to the second working position.

7. The proportional reversing system for preventing valve core from sticking according to claim 6, characterized in that: The actuating cylinder (3) is provided with an action sensor, the action sensor being communicatively connected to the controller and used for detecting whether the actuating cylinder (3) has moved into position.

8. The proportional reversing system for preventing valve core from sticking according to claim 7, characterized in that: A displacement sensor is provided on the valve core of the proportional reversing valve (2), and the displacement sensor is communicatively connected to the control and is used to detect whether the valve core is stuck.

9. The proportional reversing system for preventing valve core from sticking according to claim 8, characterized in that: A separately controlled driver is installed on the proportional reversing valve (2), and the driver is connected to the valve core and can drive the valve core to move.

10. A hydroelectric speed governor, characterized in that: The invention comprises a proportional reversing system for preventing valve core from getting stuck as described in any one of claims 1 to 9.

Images