Wind turbine generator hydraulic system with low-temperature-resistant mechanism

Abstract

The invention discloses a wind turbine generator hydraulic system with a low-temperature-resistant mechanism, and relates to the technical field of wind turbine generator equipment. The device comprises an oil tank filled with hydraulic oil, an active heating assembly is arranged in the oil tank; an oil pump, a filter, a one-way valve, a pressure-limiting valve, a reversing valve and an execution oil cylinder are arranged outside the oil tank; the reversing valve is of a two-position four-way valve structure; an oil inlet of the oil pump is communicated with the oil tank through an oil pumping pipe; an oil outlet of the oil pump is communicated with an inlet of the filter through an oil discharging pipe; an outlet of the filter supplies oil into the pressure limiting valve through the one-way valve; a pressure relief opening of the pressure limiting valve is communicated with the oil tank through a pressure relief pipe, and a pressure limiting opening of the pressure limiting valve is communicated with an oil inlet of the reversing valve; two working oil ports of the reversing valve are communicated with ports in the two ends of the execution oil cylinder respectively, and an oil outlet of the reversing valve is communicated with the oil tank through an oil discharging pipe. The hydraulic system has the beneficial effects that the temperature of hydraulic oil can be increased in an active heating mode, and the operation reliability of the hydraulic system in the low-temperature environment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine equipment, and in particular to a wind turbine hydraulic system with a low-temperature resistant mechanism. Background Art

[0002] Wind turbines are important equipment in wind power generation and have a direct impact on the economic benefits of wind power generation projects. Daily maintenance and equipment management must be strengthened. The hydraulic system of wind turbines is a power system of wind turbines. Its main function is to provide hydraulic driving force for the variable pitch control device, safe pitch control device, yaw drive and brake device, and parking brake device.

[0003] The most common driving medium of the hydraulic system is hydraulic oil. In low temperature conditions such as winter in the north, if the hydraulic oil temperature is too low, the viscosity will increase, and the pressure cannot be released smoothly, causing the oil pressure in the system to be too high, resulting in equipment failure and affecting the normal operation of the wind turbine. Therefore, it is necessary to ensure that the hydraulic system has sufficient low temperature resistance. Although there are hydraulic oils with good low temperature resistance, this measure can only reduce the adverse effects on the hydraulic oil in low temperature environments. The situation where the oil temperature is at low temperature for a long time will not change. In a long-term low temperature environment, the operation of the hydraulic system cannot be reliably guaranteed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a wind turbine hydraulic system with a low-temperature resistant mechanism in response to the above-mentioned technical deficiencies, which can increase the temperature of the hydraulic oil by active heating and improve the reliability of the hydraulic system operation in a low-temperature environment.

[0005] The technical solution adopted by the present invention is: to provide a wind turbine hydraulic system with a low-temperature resistant mechanism, comprising an oil tank filled with hydraulic oil; an active heating component is arranged in the oil tank; an oil pump, a filter, a one-way valve, a pressure-limiting valve, a reversing valve and an actuator oil cylinder are arranged outside the oil tank; the reversing valve is a two-position four-way valve structure; the oil inlet of the oil pump is connected with the oil tank through an oil extraction pipe, and the oil outlet of the oil pump is connected with the inlet of the filter through an oil discharge pipe; the outlet of the filter supplies oil to the pressure-limiting valve through a one-way valve; the pressure relief port of the pressure-limiting valve is connected with the oil tank through a pressure relief pipe, and the pressure-limiting port of the pressure-limiting valve is connected with the oil inlet of the reversing valve; the two working oil ports of the reversing valve are respectively connected with the two end ports of the actuator oil cylinder, and the oil outlet of the reversing valve is connected with the oil tank through an oil drain pipe;

[0006] The active heating component includes shaft seats fixed on opposite sides of the inner wall of the oil tank; a reciprocating screw is connected between the two shaft seats; the reciprocating screw is rotatably connected to the shaft seat; a paddle wheel fan is sleeved and fixed at one end of the reciprocating screw; the paddle wheel fan is immersed in hydraulic oil; a support sleeve is threadedly sleeved on the reciprocating screw; a plurality of mounting plates are radially distributed on the outer wall of the support sleeve; a guide rod is arranged parallel to the outside of the reciprocating screw; the guide rod is fixed to the oil tank; a guide sleeve is fixed on the support sleeve and slides corresponding to the guide rod; the inlet end of the oil extraction pipe corresponds to the edge facing the paddle wheel fan; an electric heating plate is fixed on the mounting plate; the electric heating plate is powered by a power module connected to the outside of the oil tank.

[0007] To further optimize the technical solution, a temperature sensor is installed inside an oil tank of a hydraulic system of a wind turbine set having a low-temperature resistant mechanism; the temperature sensor is connected to a control circuit of a power module.

[0008] To further optimize the technical solution, a filter net is provided on the upper inner side of an oil tank of a hydraulic system of a wind turbine unit with a low-temperature resistant mechanism; the outlet ends of the pressure relief pipe and the oil drain pipe are both located above the filter net.

[0009] To further optimize the technical solution, an air filter is installed in the air port of the oil tank of the hydraulic system of a wind turbine set with a low-temperature resistant mechanism.

[0010] The beneficial effects of the present invention are:

[0011] The oil tank stores hydraulic oil, providing sufficient driving medium for the operation of the hydraulic system; the oil pump extracts hydraulic oil through the oil extraction pipe and then discharges it through the oil discharge pipe, which can increase the pressure of the hydraulic oil in the pipeline; the filter filters impurities in the hydraulic oil to make the system run stably and reliably; the pressure-limiting valve can limit the pressure of the hydraulic oil to a specified range to avoid excessive hydraulic oil pressure and cause system operation failure; the reversing valve can switch which end of the actuator cylinder the hydraulic oil enters from, thereby realizing the reciprocating motion of the actuator cylinder output component; the reciprocating motion of the actuator cylinder output component can realize the action output of the hydraulic system.

[0012] The impeller fan is immersed in hydraulic oil, the impeller fan is sleeved and fixed on the reciprocating screw, and the inlet end of the oil extraction pipe corresponds to the edge of the impeller fan. When the oil extraction pipe extracts oil, it will cause the hydraulic oil in the oil tank to flow. The power of the flow can drive the impeller fan to rotate, thereby driving the reciprocating screw to rotate.

[0013] A support sleeve is connected to the threaded sleeve on the reciprocating screw; a plurality of mounting plates are radially distributed on the outer wall of the support sleeve, and an electric heating plate is fixed on the mounting plate. The hydraulic oil can be actively heated by the electric heating plate, thereby improving the reliability of the hydraulic system operation in a low-temperature environment; a guide rod is arranged parallel to the outside of the reciprocating screw, and a guide sleeve is fixed on the support sleeve, which slides corresponding to the guide rod. The rotation of the reciprocating screw can drive the mounting plate to move back and forth along the length direction of the reciprocating screw, so that the electric heating plate can move back and forth to heat the hydraulic oil in the oil tank, which can heat up faster and have a higher heat utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 Schematic diagram of the structure of the active heating component.

[0016] In the figure, 1, oil tank; 2, oil pump; 3, filter; 4, one-way valve; 5, pressure limiting valve; 6, reversing valve; 7, actuator cylinder; 8, oil extraction pipe; 9, oil discharge pipe; 10, pressure relief pipe; 11, oil drain pipe; 12, shaft seat; 13, reciprocating screw rod; 14, impeller fan; 15, support sleeve; 16, mounting plate; 17, guide rod; 18, guide sleeve; 19, electric heating plate; 20, power module; 21, temperature sensor; 22, filter screen; 23, air filter. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] like Figure 1 As shown, a hydraulic system of a wind turbine with a low-temperature resistant mechanism comprises an oil tank 1 filled with hydraulic oil; an active heating component is arranged in the oil tank 1; an oil pump 2, a filter 3, a one-way valve 4, a pressure-limiting valve 5, a reversing valve 6 and an actuating cylinder 7 are arranged outside the oil tank 1; the reversing valve 6 is a two-position four-way valve structure; the oil inlet of the oil pump 2 is connected with the oil tank 1 through an oil extraction pipe 8, and the oil outlet of the oil pump 2 is connected with the inlet of the filter 3 through an oil discharge pipe 9; the outlet of the filter 3 supplies oil to the pressure-limiting valve 5 through the one-way valve 4; the pressure relief port of the pressure-limiting valve 5 is connected with the oil tank 1 through a pressure relief pipe 10, and the pressure-limiting port of the pressure-limiting valve 5 is connected with the oil inlet of the reversing valve 6; the two working oil ports of the reversing valve 6 are respectively connected with the two end ports of the actuating cylinder 7, and the oil outlet of the reversing valve 6 is connected with the oil tank 1 through an oil drain pipe 11;

[0019] like Figure 1-2As shown, the active heating component includes shaft seats 12 respectively fixed on opposite sides of the inner wall of the oil tank 1; a reciprocating screw 13 is connected between the two shaft seats 12; the reciprocating screw 13 is rotatably connected to the shaft seat 12; a paddle wheel fan 14 is sleeved and fixed at one end of the reciprocating screw 13; the paddle wheel fan 14 is immersed in hydraulic oil; a support sleeve 15 is threadedly sleeved on the reciprocating screw 13; a plurality of mounting plates 16 are radially distributed on the outer wall of the support sleeve 15; a guide rod 17 is arranged parallel to the outside of the reciprocating screw 13; the guide rod 17 is fixed to the oil tank 1; a guide sleeve 18 sliding corresponding to the guide rod 17 is fixed on the support sleeve 15; the inlet end of the oil extraction pipe 8 corresponds to the edge facing the paddle wheel fan 14; an electric heating plate 19 is fixed on the mounting plate 16; the electric heating plate 19 is powered by a power module 20 connected to the outside of the oil tank 1.

[0020] The oil pump 2 extracts hydraulic oil from the oil tank 1 and pressurizes it, so that the hydraulic oil can generate sufficient hydraulic driving force to control the action of the actuator cylinder 7. The actuator cylinder 7 is usually used as an actuator of equipment such as yaw drive and braking device, parking brake device, etc. This technical solution adopts a reversing valve 6 with a two-position four-way valve structure. Through the control of the reversing valve 6, the two working oil ports can be one for oil inlet and one for oil outlet, and the direction can be switched, so that the switching of the oil inlet and oil outlet of the two end ports of the actuator cylinder 7 can be realized, so that the actuator cylinder 7 can realize the reciprocating motion of the output component and complete the power output required by the hydraulic system.

[0021] The function of the pressure-limiting valve 5 is to limit the pressure of the hydraulic oil within a specified range, and to discharge the excess pressure of the hydraulic oil to the oil tank 1 through the pressure relief pipe 10, so as to avoid excessive pressure of the hydraulic oil and cause system operation failure. However, in low temperature conditions such as winter in the north, if the temperature of the hydraulic oil is too low, the viscosity will increase, and the pressure-limiting valve 5 will not be able to release pressure smoothly. The oil pressure in the system will easily be too high, causing equipment failure and affecting the normal operation of the wind turbine. Therefore, the present application sets an active heating component to actively heat the hydraulic oil to avoid the above problems.

[0022] In the present technical solution, the flow of hydraulic oil caused by the oil extraction pipe 8 drives the impeller fan 14 to rotate, which can drive the reciprocating screw 13 to rotate. Through the screw connection between the support sleeve 15 and the reciprocating screw 13 and the sliding setting of the guide sleeve 18 and the guide rod 17, the mounting plate 16 can reciprocate along the length of the reciprocating screw 13 inside the oil tank 1, and the electric heating plate 19 can move to heat the hydraulic oil.

[0023] In the above process, the flow of hydraulic oil generated by pumping oil drives the impeller fan 14 to rotate, and on the one hand drives the mounting plate 16 to drive the electric heater 19 to move back and forth. Through this continuous movement and heating method, the electric heater 19 can directly heat different positions in the hydraulic oil. Compared with the local heating of the hydraulic oil and then the heat conduction by itself, this solution undoubtedly has a faster heating efficiency and a higher heat utilization rate, reduces the loss generated during heat conduction, and has an outstanding effect on the heating of the hydraulic oil. On the other hand, the continuous rotation of the impeller fan 14 and the reciprocating movement of the mounting plate 16 can have a stirring effect on the hydraulic oil, further promoting the transfer of heat during heating.

[0024] The arrangement of the reciprocating screw rod 13 enables the electric heating plate 19 to move back and forth without changing the rotation direction of the impeller fan 14 .

[0025] In addition, the reciprocating screw 13 rotates with the shaft seat 12. Since the reciprocating screw 13 is immersed in the hydraulic oil, the hydraulic oil can maintain lubrication between the reciprocating screw 13 and the shaft seat 12, thereby ensuring the reliability of the rotation of the reciprocating screw 13 during long-term use.

[0026] like Figure 1 As shown, a temperature sensor 21 is installed inside the oil tank 1; the temperature sensor 21 is connected to the control circuit of the power module 20. The temperature sensor 21 can monitor the temperature of the hydraulic oil in the oil tank 1. Once the temperature is lower than the preset value, the power module 20 can be controlled to supply power to the electric heater 19 to heat the hydraulic oil. Of course, when the temperature rises to a high enough level, the power module 20 cuts off the power supply and the electric heater 19 stops heating. This method can not only prevent low temperature, but also avoid energy waste caused by excessive heating.

[0027] like Figure 1 As shown, a filter screen 22 is provided on the upper side of the oil tank 1; the outlet ends of the pressure relief pipe 10 and the oil drain pipe 11 are both above the filter screen 22. The filter screen 22 can further filter the hydraulic oil discharged during the pressure relief action and the return of the actuator cylinder 7, ensuring the cleanliness of the hydraulic oil in the oil tank 1.

[0028] like Figure 1 As shown, an air filter 23 is correspondingly installed in the air port of the fuel tank 1. The air filter 23 prevents external air impurities from entering the fuel tank 1.

[0029] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A wind turbine hydraulic system with a low temperature resistant mechanism, characterized in that: The invention comprises an oil tank (1) filled with hydraulic oil; an active heating component is arranged in the oil tank (1); an oil pump (2), a filter (3), a one-way valve (4), a pressure limiting valve (5), a reversing valve (6) and an actuating oil cylinder (7) are arranged outside the oil tank (1); the reversing valve (6) is a two-position four-way valve structure; the oil inlet of the oil pump (2) is connected to the oil tank (1) through an oil extraction pipe (8), and the oil outlet of the oil pump (2) is connected to the filter (3) through an oil discharge pipe (9). ); the outlet of the filter (3) supplies oil to the pressure limiting valve (5) through the one-way valve (4); the pressure relief port of the pressure limiting valve (5) is connected to the oil tank (1) through the pressure relief pipe (10), and the pressure limiting port of the pressure limiting valve (5) is connected to the oil inlet of the reversing valve (6); the two working oil ports of the reversing valve (6) are respectively connected to the two end ports of the actuator cylinder (7), and the oil outlet of the reversing valve (6) is connected to the oil tank (1) through the oil drain pipe (11); The active heating component comprises shaft seats (12) respectively fixed on opposite sides of the inner wall of the oil tank (1); a reciprocating screw (13) is connected between the two shaft seats (12); the reciprocating screw (13) is rotatably connected to the shaft seat (12); a paddle wheel fan (14) is sleeved and fixed at one end of the reciprocating screw (13); the paddle wheel fan (14) is immersed in hydraulic oil; a support sleeve (15) is threadedly sleeved on the reciprocating screw (13); a plurality of installation sleeves (15) are radially distributed on the outer wall of the support sleeve (15); The invention relates to a mounting plate (16); a guide rod (17) is arranged parallel to the outer side of the reciprocating screw rod (13); the guide rod (17) is fixedly connected to the oil tank (1); a guide sleeve (18) is fixed on the support sleeve (15) and slides corresponding to the guide rod (17); the inlet end of the oil extraction pipe (8) corresponds to the edge of the impeller fan (14); an electric heating plate (19) is fixed on the mounting plate (16); the electric heating plate (19) is powered by a power module (20) connected to the outside of the oil tank (1).

2. A wind turbine hydraulic system with a low temperature resistant mechanism according to claim 1, characterized in that: A temperature sensor (21) is installed inside the oil tank (1); the temperature sensor (21) is connected to a control circuit of a power module (20).

3. A wind turbine hydraulic system with a low temperature resistant mechanism according to claim 1, characterized in that: A filter screen (22) is correspondingly sleeved on the inner upper side of the oil tank (1); outlet ends of both the pressure relief pipe (10) and the oil drain pipe (11) are located above the filter screen (22).

4. A wind turbine hydraulic system with a low temperature resistant mechanism according to claim 1, characterized in that: An air filter (23) is correspondingly installed in the air port of the oil tank (1).

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