Multi-speed opening and closing bulkhead gate device

Abstract

A multi-speed opening and closing bulkhead gate device relates to the field of hydraulic and hydroelectric engineering. The hydraulic system comprises a bulkhead gate, a servomotor, a hydraulic pipeline assembly, a high-level oil tank, an oil pressing station and a control valve assembly, the hydraulic pipeline assembly comprises a main oil supply pipeline, an auxiliary oil supply pipeline, an oil return pipeline and a closing pipeline, the bulkhead gate is connected with the servomotor in a direct connection mode, and the main oil supply pipeline is connected with a lower oil cavity of the servomotor; the high-level oil tank is arranged above the oil pressing station, and the high-level oil tank is connected with an upper oil cavity of the servomotor through an auxiliary oil supply pipeline, connected with the oil pressing station through an oil return pipeline and connected with the main oil supply pipeline through a closing pipeline; a control valve assembly is connected between the main oil supply pipeline and the oil pressing station. The opening and closing speed of the gate can be more accurately controlled according to actual requirements, and the requirements of different working conditions are met. The gate operation is optimized, various water flow conditions and operation requirements are met, and the operation flexibility and adaptability of the gate are improved.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic and hydropower engineering, in particular to a multi-speed opening and closing flat plate gate device suitable for locations such as the outlet of a long-distance water pipeline and the tailwater outlet of a low-head turbine, and is a multi-speed dynamic water closing and partially opening flat plate gate device. Background Art

[0002] Flat gates are mainly used in low-head projects to open and close upstream and downstream water flows, and to partially open for flow as needed. For some projects with complex functions, in addition to realizing the conventional functions of flat gates, it is hoped that the flat gates can operate in stages at multiple speeds during the opening and closing process. For example, when used at the outlet of a long-distance water pipeline, in order to reduce the downstream flow in time, it is hoped that the gate can be closed quickly. However, in order to avoid excessive water hammer in the water pipeline, ensure the safety of the water pipeline, and even control the surge of the upstream reservoir or pool, it is also hoped that the gate can be closed at medium and low speeds in the second half of the gate closure; for low-head turbine tailwater outlet gates used as accident gates, it is hoped that the gate can be closed quickly. At the same time, in order to ensure the safety of the water flow channel through the machine and the safety of the equipment, such as preventing the unit from lifting the machine, it is also hoped that the gate can be closed at medium and low speeds in the second half of the closure. When the gate is opened and closed normally, it runs at a normal speed (medium speed). When it is partially opened, it is hoped that the gate will run at a slow speed to prevent overshoot caused by the inertia of the gate at a high speed, so as to ensure the control accuracy of the partial opening operation. However, the current operation speed of the flat gate is uniform, which is not suitable for complex projects. Summary of the invention

[0003] The utility model aims to solve the problem that in low head projects, existing flat gates all run at a uniform speed and cannot meet the needs of complex projects, and provides a multi-speed opening and closing flat gate device.

[0004] The utility model discloses a multi-speed opening and closing flat gate device, characterized in that the gate device comprises a flat gate, a servomotor, a hydraulic pipeline assembly, a high-position oil tank, an oil pressure station and a control valve assembly, the hydraulic pipeline assembly comprises a main oil supply pipeline, an auxiliary oil supply pipeline, an oil return pipeline and a closing pipeline, the flat gate is connected to the servomotor in a direct connection manner, the main oil supply pipeline is connected to the lower oil chamber of the servomotor; the high-position oil tank is arranged above the oil pressure station, the high-position oil tank is respectively connected to the upper oil chamber of the servomotor through the auxiliary oil supply pipeline, connected to the oil pressure station through the oil return pipeline and connected to the main oil supply pipeline through the closing pipeline; the control valve assembly is connected between the main oil supply pipeline and the oil pressure station; wherein:

[0005] The control valve assembly includes an opening control valve group and a closing control valve group. There are at least two opening control valve groups connected in parallel on the oil pipe between the main oil supply pipeline and the oil pressure station. Each opening control valve group includes a control valve, a throttle valve and a one-way valve installed on the oil pipe in sequence from bottom to top. There are at least two closing control valves connected in parallel on the oil pipe between the main oil supply pipeline and the oil pressure station and between the opening control valve group and the high-level oil tank. Each closing control valve group includes a control valve, a throttle valve and a one-way valve installed on the oil pipe in sequence from top to bottom.

[0006] The oil pressure station includes an oil supply tank, a high-pressure oil pump, an oil filter, a one-way valve and a control valve. The oil supply tank is placed below the high-position oil tank, and the oil filter is placed inside the oil supply tank. The oil filter is connected to the opening control valve group through an oil supply pipeline. The high-pressure oil pump, the one-way valve and the control valve are installed on the oil supply pipeline in sequence. The high-pressure oil pump is close to the oil filter, and the control valve is close to the opening control valve group.

[0007] The closing pipeline is provided with an emergency closing valve, and when closing is required, the closing operation can be performed through the emergency closing valve.

[0008] The hydraulic oil in the oil supply tank passes through the oil filter and enters the high-pressure oil pump. The generated high-pressure oil is discharged to the lower oil chamber of the servomotor through the opening control valve group, and the flat gate is opened through the servomotor. Through multiple groups of opening control valve groups with different speeds, the need to open the flat gate at different speeds is realized; when the control valve group is opened and closed, the flat gate relies on its own gravity to press the hydraulic oil in the lower oil chamber of the servomotor back to the high-level oil tank, and at the same time, the gate is closed at different speeds. The hydraulic oil in the upper oil chamber of the servomotor is connected to the high-level oil tank through the auxiliary oil supply pipeline, and the hydraulic oil in the high-level oil tank is connected to the oil supply tank through the return oil pipeline; when emergency closure is required, the emergency closing valve can be used for closing. The high-level oil tank is used to replenish and receive the oil in the servomotor to ensure that the servomotor is full of oil and the oil supply is stable.

[0009] The multi-speed opening and closing flat gate device of the utility model has a simple structure, scientific design, and is easy to use. It can more accurately control the opening and closing speed of the gate according to actual needs and meet the requirements of different working conditions. It is helpful to optimize the operation of the gate, adapt to various water flow conditions and operating requirements, and improve the operating flexibility and adaptability of the gate. Select the most appropriate opening and closing speed under different working conditions to better respond to emergencies and improve the safety of project operation. The operation process is simplified, maintenance and management are convenient, and conditions are provided for the overall automation control and intelligent management of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model.

[0011] Among them: flat gate 1, relay 2, high-level oil tank 3, open control valve group 4, close control valve group 5, oil pressure station 6, emergency shut-off valve 7, control valve 8, throttle valve 9, check valve 10, oil tank 11, oil filter 12, high-pressure oil pump 13, main oil supply pipeline 14, auxiliary oil supply pipeline 15, oil return pipeline 16, closing pipeline 17. DETAILED DESCRIPTION

[0012] Embodiment 1: A multi-speed opening and closing flat gate device comprises a flat gate, a relay, a hydraulic pipeline assembly, a high-level oil tank, an oil pressure station and a control valve assembly, wherein the hydraulic pipeline assembly comprises a main oil supply pipeline, an auxiliary oil supply pipeline, an oil return pipeline and a closing pipeline, wherein the flat gate is directly connected to the relay, and the main oil supply pipeline is connected to the lower oil chamber of the relay; the high-level oil tank is arranged above the oil pressure station, and the high-level oil tank is respectively connected to the upper oil chamber of the relay through the auxiliary oil supply pipeline, to the oil pressure station through the oil return pipeline, and to the main oil supply pipeline through the closing pipeline; the control valve assembly is connected between the main oil supply pipeline and the oil pressure station; an emergency closing valve is arranged on the closing pipeline, and when closing is required, the emergency closing valve can be used for closing operation; the high-level oil tank is an ordinary oil tank, and is defined as a high-level oil tank because its height is higher than the oil pressure station; wherein:

[0013] The control valve assembly includes an opening control valve group and a closing control valve group. There are at least two opening control valve groups connected in parallel on the oil pipe between the main oil supply pipeline and the oil pressure station. Each opening control valve group includes a control valve, a throttle valve and a one-way valve installed on the oil pipe in sequence from bottom to top. There are at least two closing control valves connected in parallel on the oil pipe between the main oil supply pipeline and the oil pressure station and between the opening control valve group and the high-level oil tank. Each closing control valve group includes a control valve, a throttle valve and a one-way valve installed on the oil pipe in sequence from top to bottom.

[0014] The oil pressure station includes an oil supply tank, a high-pressure oil pump, an oil filter, a one-way valve and a control valve. The oil supply tank is placed below the high-position oil tank, and the oil filter is placed inside the oil supply tank. The oil filter is connected to the opening control valve group through an oil supply pipeline. The high-pressure oil pump, the one-way valve and the control valve are installed on the oil supply pipeline in sequence. The high-pressure oil pump is close to the oil filter, and the control valve is close to the opening control valve group.

[0015] The hydraulic oil in the oil supply tank passes through the oil filter and enters the high-pressure oil pump. The generated high-pressure oil is discharged to the lower oil chamber of the servomotor through the opening control valve group, and the flat gate is opened through the servomotor. Through multiple groups of opening control valve groups with different speeds, the need to open the flat gate at different speeds is realized; when the control valve group is opened and closed, the flat gate relies on its own gravity to press the hydraulic oil in the lower oil chamber of the servomotor back to the high-level oil tank, and at the same time, the gate is closed at different speeds. The hydraulic oil in the upper oil chamber of the servomotor is connected to the high-level oil tank through the auxiliary oil supply pipeline, and the hydraulic oil in the high-level oil tank is connected to the oil supply tank through the return oil pipeline; when emergency closure is required, the emergency closing valve can be used for closing. The high-level oil tank is used to replenish and receive the oil in the servomotor to ensure that the servomotor is full of oil and the oil supply is stable.

[0016] The operation process of opening and closing the flat gate at multiple speeds is as follows:

[0017] 1) Opening of flat gate: The flat gate is opened by driving the piston rod in the relay upward through pressure oil. The high-pressure oil pump is filtered through the oil filter and absorbs the hydraulic oil in the oil supply tank. The hydraulic oil passes through the one-way valve and control valve of the opening control valve group to establish the operating oil pressure. The hydraulic oil reaches the lower chamber of the relay through the opening control valve group to open the flat gate. There are two parallel pipelines in the opening control valve group. Each pipeline is equipped with a control valve and a throttle valve. The throttle valves of each group use different flow rates to control the flat gate to obtain different opening speeds. The oil pressure is Enter the lower oil chamber of the relay through the one-way valve, open the flat gate, and the upper chamber oil in the relay returns to the high-level oil tank; in the process, observe the opening height of the flat gate, and when it reaches the fully open setting position, close the various components of the opening control valve group to stop the flat gate action; the two throttle valves in the opening control valve group of this device, one is a low-speed valve, which is a low-speed gear when opened alone, and the other is a medium-speed valve, which is a medium-speed gear when opened alone. When the throttle valves of both ways are opened at the same time, it is a high-speed gear; in the process of opening the flat gate, the opening function can be realized with a combination of three speeds;

[0018] 2) Closing of flat gate: The flat gate relies on its own gravity to drive the piston rod in the relay to move downward to close the flat gate. When the piston rod moves downward, the hydraulic oil is squeezed out of the lower oil chamber, and the hydraulic oil returns to the high-level oil tank through the closing control valve group. The closing control valve group is equipped with two parallel pipelines, each of which includes a control valve and a throttle valve. The two throttle valves use different flow rates to control the closing speeds of the flat gate. The hydraulic oil returns to the high-level oil tank through the two one-way valves of the closing control valve group. At the same time, the hydraulic oil in the high-level oil tank enters the upper chamber of the relay to replenish oil. During the process, the closing position of the flat gate is observed. When it is completely closed, the control valve of the closing control valve group is closed to stop the action of the flat gate. The two throttle valves in the closing control valve group of this device are one low-speed gear and the other medium-speed gear. When both are fully open, they are high-speed gear. During the closing process of the flat gate, the closing function can be achieved with a combination of three speeds;

[0019] 3) Partial opening operation of flat gate: When the flat gate is in the process of opening, the hydraulic oil pushes the piston rod in the relay to move upward. When it rises to the height required for partial opening, the control valve of the opening control valve group is closed; when the flat gate is in the process of closing, the flat gate relies on its own gravity to drive the piston rod in the relay to move downward. When it descends to the height required for partial opening, the control valve of the closing control valve group is closed to achieve partial opening operation of the flat gate; in order to improve the control accuracy of the flat gate, the control circuit uses a throttle valve with the smallest flow rate at this time;

[0020] 4) Emergency closing of flat gate: When the emergency closing valve is opened, the flat gate relies on its own gravity to drive the piston rod in the relay to move downward to close the flat gate. When the piston rod moves downward, it squeezes the hydraulic oil out of the lower oil chamber, and the oil returns directly to the high-level oil tank through the emergency closing valve, and the flat gate moves to full closure. During the process of emergency closing of the flat gate, the flat gate is closed at a faster and uniform speed.

[0021] A position sensor can be added to the flat gate of the device. After the position sensor is connected to the PLC control, the control valve components in the opening control valve group and the closing control valve group can be directly operated by the PLC controller, which can realize automatic opening, closing control, and partial opening operation of the flat gate, reduce manual operation, and improve control accuracy and response time.

Claims

1. A multi-speed opening and closing flat gate device, characterized in that The gate device includes a flat gate, a relay, a hydraulic pipeline assembly, a high-position oil tank, an oil pressure station and a control valve assembly. The hydraulic pipeline assembly includes a main oil supply pipeline, an auxiliary oil supply pipeline, an oil return pipeline and a closing pipeline. The flat gate is directly connected to the relay, and the main oil supply pipeline is connected to the lower oil chamber of the relay; the high-position oil tank is arranged above the oil pressure station, and the high-position oil tank is connected to the upper oil chamber of the relay through the auxiliary oil supply pipeline, the oil pressure station through the oil return pipeline, and the main oil supply pipeline through the closing pipeline; the control valve assembly is connected between the main oil supply pipeline and the oil pressure station; wherein: The control valve assembly includes an opening control valve group and a closing control valve group. There are at least two opening control valve groups connected in parallel on the oil pipe between the main oil supply pipeline and the oil pressure station. Each opening control valve group includes a control valve, a throttle valve and a one-way valve installed on the oil pipe in sequence from bottom to top. There are at least two closing control valves connected in parallel on the oil pipe between the main oil supply pipeline and the oil pressure station and between the opening control valve group and the high-level oil tank. Each closing control valve group includes a control valve, a throttle valve and a one-way valve installed on the oil pipe in sequence from top to bottom. The oil pressure station includes an oil supply tank, a high-pressure oil pump, an oil filter, a one-way valve and a control valve. The oil supply tank is placed below the high-position oil tank, and the oil filter is placed inside the oil supply tank. The oil filter is connected to the opening control valve group through an oil supply pipeline. The high-pressure oil pump, the one-way valve and the control valve are installed on the oil supply pipeline in sequence. The high-pressure oil pump is close to the oil filter, and the control valve is close to the opening control valve group.

2. The multi-speed opening and closing flat gate device according to claim 1, characterized in that The closing pipeline is provided with an emergency closing valve.

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