Energy-saving turning hydraulic system

Abstract

The utility model discloses an energy-saving turning hydraulic system which comprises a motor, a load-sensitive plunger pump, a cut-off electromagnetic valve, a load-sensitive proportional multi-way valve, a bidirectional balance valve, a high-pressure overflow valve, a motor control valve set and a parking brake. A load-sensitive system is adopted, the hydraulic oil amount and the system pressure required by the system during working are provided according to actual requirements, and no pressure or overflow loss exists; when the system pressure reaches the set cut-off pressure of the load-sensitive plunger pump, the load-sensitive plunger pump only maintains the system high pressure and has no redundant flow output, at the moment, the displacement output of the load-sensitive plunger pump is almost zero, and the system has no overflow loss; the load-sensitive plunger pump adopts constant power control, constant power output of a motor for driving the load-sensitive plunger pump is kept, and the working efficiency of the turning gear is improved; the hydraulic system has oil return heat dissipation and active heat dissipation functions, and the load-sensitive hydraulic system has two heat dissipation functions through one pump.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a winching device required for installing a horizontal single blade, and specifically to a hydraulic system involved in the winching device. Background Art

[0002] At present, the wind power industry is developing rapidly, the installed capacity of wind turbines is getting larger and larger, the weight of wind turbine blades is getting heavier and longer, and the requirements for lifting equipment are getting higher and higher; coupled with the high cost of temporary land acquisition for construction platforms and environmental protection requirements, it is an inevitable trend to change the original impeller overall lifting to single blade step-by-step lifting. The horizontal single-blade lifting technology has gradually matured, with low lifting cost and high efficiency, which solves the problem of large wind turbine lifting; when installing the blades, the horizontal single-blade hoist needs to drive the wind turbine impeller to rotate through the turning device to meet the single-blade installation requirements and ensure that each blade is installed horizontally.

[0003] The winch device is installed inside the fan and connected to the fan main shaft. The winch is driven by a hydraulic system and is equipped with a generator set for operation. Therefore, the winch device is limited by weight, size and motor power. The winch is driven by a hydraulic open system, and the system is simple; but there are the following problems:

[0004] 1. The output displacement of the turning hydraulic pump cannot be changed with the turning drive torque, which makes the turning speed low and affects the fan lifting efficiency.

[0005] 2. The system heats up quickly during the turning process. Some manufacturers reduce the turning speed to slow down the heating of the system. Some manufacturers are forced to shut down and cool down when the oil temperature of the turning hydraulic system exceeds the allowable range, and then start to work again when the oil temperature drops to the allowable value. Some manufacturers add a set of motor oil pump and air cooler heat dissipation devices in addition to the original turning device, making the hydraulic system complex and costly, and limited by the overall weight, size and motor power of the turning gear. The high oil temperature of the turning hydraulic system seriously affects the turning efficiency.

[0006] 3. The hydraulic system working pressure has an overflow valve setting, and the pump adopts a fixed-displacement pump. When the turning needs to slow down, there is overflow loss in the hydraulic system and the heat generation increases. Utility Model Content

[0007] In order to solve the problems in the prior art, the present invention provides an energy-saving turning hydraulic system.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] An energy-saving turning hydraulic system comprises an electric motor (2), a load-sensitive plunger pump (3), a stop-type solenoid valve (5), a load-sensitive proportional multi-way valve (6), a two-way balancing valve (7), a high-pressure relief valve (8), a motor (9), a control valve group and a parking brake (10);

[0010] The motor (2) is connected to the load-sensitive plunger pump (3) by driving. The input port of the load-sensitive plunger pump (3) is used to suck hydraulic oil. The output port of the load-sensitive plunger pump (3) is divided into two paths. One path enters the load-sensitive proportional multi-way valve (6). The pressure feedback LS port on the load-sensitive proportional multi-way valve (6) is connected to the LS control oil port on the load-sensitive plunger pump (3); and the other path enters the stop-type solenoid valve (5).

[0011] When both the load-sensing proportional multi-way valve (6) and the stop-type solenoid valve (5) are de-energized, the zero pressure of the pressure feedback LS port on the load-sensing proportional multi-way valve (6) is transmitted to the LS control oil port on the load-sensing plunger pump (3), and the hydraulic system maintains the LS control pressure. At this time, the load-sensing plunger pump (3) has no flow output, and the system has no pressure and no overflow;

[0012] When the load-sensing proportional multi-way valve (6) is energized, the stop-type solenoid valve (5) is de-energized, and the output pressure oil source of the load-sensing plunger pump (3) passes through the load-sensing proportional multi-way valve (6), and the output pressure oil source passes through the junction block and is connected in parallel to one side oil port of the multiple motor (9) control valve groups, and the other side oil port of the motor (9) control valve group passes through the junction block and is connected to the other oil port of the load-sensing proportional multi-way valve (6);

[0013] A two-way balancing valve (7) is installed on the motor (9) control valve group for balancing the torque of the fan impeller negative load acting on the motor (9); high-pressure relief valves (8) are installed on both sides of the motor (9) control valve group.

[0014] Preferably, the input port of the load-sensitive plunger pump (3) is connected to an oil suction filter (1).

[0015] Preferably, the output port of the load-sensitive plunger pump (3) is connected to a pressure filter (4), and the output pressure oil source is divided into two paths after passing through the pressure filter (4).

[0016] Preferably, a shuttle valve, a pressure reducing valve and a hydraulic control valve are installed on the motor (9) control valve group, which are used to open the parking brake (10) on the reducer when the turning operation is in progress.

[0017] Preferably, the motor (9) oil return, the motor (9) housing oil drain and the load-sensing plunger pump (3) pump housing oil drain are connected to the air cooler (11) inlet, and after the air cooler (11) dissipates heat, the oil passes through the oil return filter (12) to the oil tank, and the hydraulic system performs oil return and heat dissipation.

[0018] Preferably, when the turning gear stops but the motor (2) of the hydraulic system continues to work, during this process, the stop solenoid valve (5) in the hydraulic system is energized, and the oil output by the load-sensitive plunger pump (3) passes through the stop solenoid valve (5) and enters the air cooler (11) for heat dissipation, and then passes through the return oil filter (12) to the oil tank, thereby actively dissipating heat in the hydraulic system.

[0019] Preferably, three sets of motor (9) control valve groups are arranged in parallel.

[0020] Beneficial effects of the present invention:

[0021] (1) The turning hydraulic system adopts a load-sensitive system, which consists of a load-sensitive plunger pump and a load-sensitive multi-way proportional valve. When working, the amount of hydraulic oil and system pressure required by the system are provided according to actual needs, without pressure and overflow loss.

[0022] (2) When the system pressure reaches the cut-off pressure set by the load-sensitive plunger pump, the load-sensitive plunger pump only maintains the system high pressure without excess flow output. At this time, the displacement output of the load-sensitive plunger pump is almost zero, and there is no overflow loss in the system.

[0023] (3) The load-sensitive piston pump adopts constant power control. The cranking gear drives the fan impeller to rotate. The driving torque changes with the rotation of the fan impeller. When the driving torque is small, the load-sensitive piston pump outputs at a large displacement. When the driving torque is large, the load-sensitive piston pump displacement output decreases accordingly, maintaining a constant power output of the motor driving the load-sensitive piston pump and improving the working efficiency of the cranking gear.

[0024] (4) The hydraulic system has oil return heat dissipation and active heat dissipation functions. In the load-sensitive hydraulic system, one pump has two heat dissipation functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a system schematic diagram of the present invention.

[0026] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] like Figure 1As shown, this embodiment provides an energy-saving turning hydraulic system, including an electric motor 2, a load-sensitive plunger pump 3, a stop solenoid valve 5, a load-sensitive proportional multi-way valve 6, a two-way balancing valve 7, a high-pressure relief valve 8, a motor 9 control valve group and a parking brake 10.

[0029] The motor 2 drives the load-sensitive plunger pump 3. After the load-sensitive plunger pump 3 sucks hydraulic oil through the oil suction filter 1, the output pressure oil source passes through the pressure filter 4 and is then divided into two paths. One path enters the load-sensitive proportional multi-way valve 6, and the pressure feedback LS port on the load-sensitive proportional multi-way valve 6 is connected to the LS control oil port on the pump; the other path enters the stop-type solenoid valve 5.

[0030] When both the load-sensing proportional multi-way valve 6 and the stop-type solenoid valve 5 are powered off, the zero pressure of the pressure feedback LS port on the load-sensing proportional multi-way valve 6 is transmitted to the LS control oil port on the load-sensing plunger pump 3, and the hydraulic system maintains the LS control pressure. At this time, the load-sensing plunger pump 3 has no flow output, and the system has no pressure and no overflow.

[0031] When the load-sensitive proportional multi-way valve 6 is energized, the stop solenoid valve 5 is not energized, and the output pressure oil source of the load-sensitive plunger pump 3 passes through the pressure filter 4 and the load-sensitive proportional multi-way valve 6. After the output pressure oil source passes through the junction block, it is connected in parallel to one side of the oil port on the three sets of motor 9 control valve groups. The other side of the oil port of the motor 9 control valve group passes through the junction block and is connected to the other oil port of the load-sensitive proportional multi-way valve 6.

[0032] The control valve group is equipped with a two-way balancing valve 7 to balance the torque of the fan impeller negative load on the motor 9, so that the motor 9 can maintain a uniform speed rotation under the negative load. High-pressure relief valves 8 are installed on both sides of the control valve group to protect it from damage in the event of an accidental external force impact during the turning process.

[0033] During the turning operation, if external force increases the turning drive resistance and feeds back to the load-sensitive plunger pump 3, exceeding the set pressure range of the load-sensitive plunger pump 3, and the pressure reaches the set cut-off pressure of the load-sensitive plunger pump 3, the load-sensitive plunger pump 3 only maintains the system high pressure without excess flow output. At this time, the displacement output of the load-sensitive plunger pump 3 is almost zero, and there is no overflow loss in the system.

[0034] During the operation of the cranking gear, the load-sensitive plunger pump 3 adopts constant power control. The cranking gear drives the fan impeller to rotate. The cranking gear driving torque changes with the rotation of the impeller. When the driving torque is small, the load-sensitive plunger pump 3 outputs with a large displacement. When the driving torque is large, the load-sensitive plunger pump 3 outputs a large displacement. When the driving torque is large, the load-sensitive plunger pump 3 outputs a small displacement. The motor 2 driving the load-sensitive plunger pump 3 maintains a constant power output, thereby improving the working efficiency of the cranking gear. The motor 9 control valve group is equipped with a shuttle valve, a pressure reducing valve and a hydraulic control valve, which are used to open the parking brake 10 on the reducer when the cranking gear is working.

[0035] The load pressure of the pressure feedback LS port on the load-sensitive proportional multi-way valve 6 is transmitted to the LS control oil port on the load-sensitive plunger pump 3. The system maintains the LS control pressure, senses the system pressure-flow demand, and only provides the required flow and pressure. The hydraulic system has the characteristic of providing the required pressure-flow according to the load conditions, reducing the energy consumption of the hydraulic system, improving efficiency, improving system controllability, reducing the system oil temperature, and extending the life of the hydraulic system.

[0036] The hydraulic system drives the motor 9 oil return, motor 9 housing oil drain and load-sensitive plunger pump 3 pump housing oil drain to be connected to the air cooler 11 inlet. After the air cooler 11 dissipates heat, the oil passes through the oil return filter 12 to the oil tank, and the hydraulic system performs oil return and heat dissipation. When the turning drive fan impeller turns to the horizontal installation position, the load-sensitive proportional multi-way valve 6 loses power, the two-way balance valve 7 on the motor control valve group locks the motor 9, keeps the load stopped, and the parking brake 10 is closed and in a braking state. At this time, the turning is in a two-stage braking state of the balance valve brake and the reducer parking brake, and the blades are installed at this time. The cranking stops but the hydraulic system motor 2 continues to work. During this process, the stop solenoid valve 5 in the hydraulic system is energized, and the load-sensitive plunger pump 3 outputs oil through the stop solenoid valve 5, enters the air cooler 11 for heat dissipation, and then passes through the return oil filter 12 to the oil tank, and circulates back and forth to cool the oil in the hydraulic oil tank to a normal value. The hydraulic system actively dissipates heat, and the cranking is ready to drive the fan impeller for the next blade installation; the hydraulic system has return oil heat dissipation and active heat dissipation functions, and has two heat dissipation characteristics of one pump in the load-sensitive hydraulic system.

[0037] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

[0038] If the words "first", "second", etc. are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only to facilitate the description of the present invention and simplify the description. Unless otherwise stated, the above words have no special meaning.

[0039] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An energy-saving turning hydraulic system, characterized in that: It comprises an electric motor (2), a load-sensitive plunger pump (3), a stop-type solenoid valve (5), a load-sensitive proportional multi-way valve (6), a two-way balancing valve (7), a high-pressure relief valve (8), a motor (9), a control valve group and a parking brake (10); The motor (2) is connected to the load-sensitive plunger pump (3) by driving. The input port of the load-sensitive plunger pump (3) is used to suck hydraulic oil. The output port of the load-sensitive plunger pump (3) is divided into two paths. One path enters the load-sensitive proportional multi-way valve (6). The pressure feedback LS port on the load-sensitive proportional multi-way valve (6) is connected to the LS control oil port on the load-sensitive plunger pump (3); and the other path enters the stop-type solenoid valve (5). When both the load-sensing proportional multi-way valve (6) and the stop-type solenoid valve (5) are de-energized, the zero pressure of the pressure feedback LS port on the load-sensing proportional multi-way valve (6) is transmitted to the LS control oil port on the load-sensing plunger pump (3), and the hydraulic system maintains the LS control pressure. At this time, the load-sensing plunger pump (3) has no flow output, and the system has no pressure and no overflow; When the load-sensing proportional multi-way valve (6) is energized, the stop-type solenoid valve (5) is de-energized, and the output pressure oil source of the load-sensing plunger pump (3) passes through the load-sensing proportional multi-way valve (6), and the output pressure oil source passes through the junction block and is connected in parallel to one side oil port of the multiple motor (9) control valve groups, and the other side oil port of the motor (9) control valve group passes through the junction block and is connected to the other oil port of the load-sensing proportional multi-way valve (6); A two-way balancing valve (7) is installed on the motor (9) control valve group for balancing the torque of the fan impeller negative load acting on the motor (9); high-pressure relief valves (8) are installed on both sides of the motor (9) control valve group.

2. The energy-saving turning hydraulic system according to claim 1 is characterized in that: The inlet of the load-sensing piston pump (3) is connected to an oil suction filter (1).

3. The energy-saving turning hydraulic system according to claim 1 is characterized in that: The output port of the load-sensitive plunger pump (3) is connected to a pressure filter (4), and the output pressure oil source is divided into two paths after passing through the pressure filter (4).

4. The energy-saving turning hydraulic system according to claim 1 is characterized in that: The motor (9) control valve group is equipped with a shuttle valve, a pressure reducing valve and a hydraulic control valve, which are used to open the parking brake (10) on the reducer when the gear is turning.

5. The energy-saving turning hydraulic system according to claim 1 is characterized in that: The motor (9) oil return, the motor (9) case oil drain and the load sensing plunger pump (3) case oil drain are connected to the air cooler (11) inlet. After the air cooler (11) dissipates heat, the oil passes through the oil return filter (12) to the oil tank, and the hydraulic system performs oil return and heat dissipation.

6. The energy-saving turning hydraulic system according to claim 1 or 5, characterized in that: When the turning gear stops but the motor (2) of the hydraulic system continues to work, during this process, the stop solenoid valve (5) in the hydraulic system is energized, and the load-sensitive plunger pump (3) outputs oil through the stop solenoid valve (5) and enters the air cooler (11) for heat dissipation, and then passes through the return oil filter (12) to the oil tank, and the hydraulic system actively dissipates heat.

7. The energy-saving turning hydraulic system according to claim 1 is characterized in that: Three motor (9) control valve groups are arranged in parallel.

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