CN115199490A - A cooling system for a semi-direct drive wind turbine - Google Patents

Abstract

The invention belongs to the technical field of wind driven generators, and relates to a cooling system of a semi-direct drive wind driven generator, which is arranged at the top of a base of the semi-direct drive wind driven generator, so that the axial length of the generator is reduced, the axial space in a cabin is saved, and the compactness of the structure of a unit is favorably improved; through the oil gas filtering device, the cleanliness of internal circulation cooling air can be improved, so that the running reliability of the generator is improved; meanwhile, cold air generated by the centrifugal ventilator can directly act on the end part of the coil of the generator, namely a heat source, without other parts of the generator, so that an energy transfer path is reduced, the cooling efficiency is improved, and the power density of the semi-direct-drive generator is further improved.

Description

A cooling system for a semi-direct drive wind turbine

technical field

The invention belongs to the technical field of wind power generators, relates to a cooling system, in particular to a cooling system of a semi-direct drive wind power generator.

Background technique

As we all know, wind turbines will produce losses during operation, which will cause the motor to heat up and the temperature will rise, which will affect the operating efficiency of the motor, and even burn out the motor in severe cases. Therefore, the heating problem directly affects the service life and reliability of the motor. With the development of science and technology, the single-unit capacity of wind turbines is increasing, and the loss and heat generated are also increasing. Therefore, it is urgent to improve the cooling system of the generator to improve its heat dissipation capacity and improve the efficiency of the motor.

At present, there are four main types of wind turbine products: double-fed, squirrel cage, direct drive and semi-direct drive. The cooling methods mainly include natural air cooling, forced air cooling, air-water cooling and water jacket cooling. In order to meet the requirements of cost reduction and efficiency increase in the wind power industry, it is necessary to optimize the structure of the cooling system of the existing semi-direct drive wind turbine to improve the reliability of the cooling system, reduce the volume of the generator, increase the power density of the generator, and improve the wind turbine. Cabin utilization.

The existing semi-direct drive generator cooling system is fixed on the rear end cover, which will inevitably increase the axial length of the generator, and the cooling air generated by the fan impeller enters the generator rear end cover, frame and other components in turn, and passes through the guide. The air guide device such as the wind hood acts on the heat source, the energy path is long, and the energy loss of the circulating air path in the generator is large, which reduces the efficiency of the fan. In addition, the existing cooling system does not consider the influence of impurities such as oil and gas in the circulating cooling air in the generator on the generator.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a cooling system for a semi-direct drive wind generator.

For achieving the above object, the present invention provides the following technical solutions:

The cooling system of the semi-direct drive wind generator includes a box mounted on the top of the generator base; the bottom of the box is provided with a cooling system air inlet and a cooling system air outlet, and the cooling system air inlet and The air outlets of the cooling system are arranged oppositely; the oil and gas filtering device, the heat exchange device and the centrifugal fan are sequentially distributed in the box. When the centrifugal fan is working, the hot air flows out from the air outlet of the base and enters the box through the air inlet of the cooling system. Inside the body, the cold air is obtained after passing through the oil and gas filter device and the heat exchange device in turn.

Further, the oil and gas filtering device and the heat exchange device are respectively fixed inside the box by bolts.

Further, a plurality of groups of filter cottons or oil and gas separators are arranged in the oil and gas filtering device.

Further, the angle of the air outlet of the volute in the centrifugal fan is adapted to the angle of the air inlet of the base.

Further, a temperature sensor A is installed at the air outlet of the machine base and the air inlet of the machine base, respectively.

Further, the heat exchange device is provided with a cooling liquid water inlet and a cooling liquid water outlet, and the cooling liquid water outlet is connected with the water outlet of the stator water jacket through a water return pipe.

Further, the heat exchange device includes a heat exchange core, and the heat exchange core is a plate-fin type air-water heat exchange core made of aluminum alloy.

Further, the cooling liquid water inlet and the cooling liquid water outlet are respectively installed with connecting flanges, and the connecting flange surface is provided with an installation interface for installing the temperature sensor B.

Further, the bottom side of the heat exchange device is respectively provided with a leakage alarm and a leakage interface.

Further, the number of the centrifugal fans is two, and each centrifugal fan includes a motor, an impeller, a volute and a collector;

When the centrifugal fan is working, the cold air after passing through the heat exchange device enters the impeller space in the axial direction, is accelerated by the high-speed rotating impeller, is collected and guided by the volute and the collector, decelerates and changes the flow direction, and enters Inside the generator, the heat of the generator is taken away through the air gap, and the hot air enters the cooling system through the air outlet of the base, and gets cold air after passing through the oil and gas filter device and the heat exchange device.

Compared with the prior art, the technical solution provided by the present invention includes the following beneficial effects: the cooling system is installed on the top of the semi-direct drive wind generator base, which reduces the axial length of the generator and saves the axial space inside the nacelle , which is beneficial to improve the compactness of the unit structure; the cooling system can improve the cleanliness of the inner circulating cooling air through the oil and gas filter device, so as to improve the reliability of the generator operation; at the same time, the cold air generated by the centrifugal fan is used, without the need to generate electricity Other components of the generator can directly act on the end of the generator coil, that is, the heat source, reducing the energy transfer path, thereby improving the cooling efficiency and further improving the power density of the semi-direct drive generator.

In addition, the air temperature sensor (i.e. temperature sensor A) at the air inlet of the generator base and the air outlet of the generator base (i.e. temperature sensor A) is set to monitor the water temperature sensor (i.e. temperature sensor A) of the cooling liquid inlet and the cooling liquid outlet. Sensor B), leakage alarm and other components can improve the reliability of the semi-direct drive wind turbine; moreover, the angle of the air outlet of the volute in the centrifugal fan is matched with the angle of the air inlet of the generator base, which optimizes the Cooling air path.

Therefore, compared with the traditional semi-direct drive cooling system, the cooling system has a simple structure, and the internal circulation cooling air path structure inside the cooling system can directly act on the heat source, the energy transfer path is small, the cooling efficiency is high, and the production cost is low. It has good application prospects and market competitiveness.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. In other words, on the premise of no creative labor, other drawings can also be obtained from these drawings.

Fig. 1 is the overall structure diagram of the cooling system of a kind of semi-direct drive wind power generator provided by the present invention;

2 is an overall structural diagram of the cooling system provided by the present invention being installed on a semi-direct drive wind turbine;

3 is a front view of the cooling system provided by the present invention being installed on a semi-direct drive wind turbine;

4 is a model diagram of the centrifugal fan volute after optimization provided by the present invention;

Fig. 5 is the fluid trace diagram of the square rib air passage;

Fig. 6 is the fluid trace diagram of the air passage of the circular rib plate;

Figure 7 is a structural diagram of a split box body.

Among them: 1. Centrifugal fan; 2. Heat exchange device; 3. Oil and gas filter device; 4. Cooling liquid inlet; 5. Cooling liquid outlet; 6. Water return pipe; 7. Cooling system outlet; 8. Cooling system Air inlet; 9. Leakage alarm; 10. Box body; 11. Generator base; 12. Exhaust valve.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with the present invention. Rather, they are merely examples of systems consistent with some aspects of the invention as recited in the appended claims.

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Example

Referring to Figures 1-2, the present invention provides a cooling system for a semi-direct drive wind turbine, including a box 10 mounted on the top of the generator base 11; the bottom of the box 10 is provided with a cooling system inlet The air outlet 8 and the cooling system air outlet 7, and the cooling system air inlet 8 and the cooling system air outlet 7 are arranged oppositely; the box 10 is sequentially distributed with a heat exchange device 2, an oil and gas filter device 3 and a centrifugal fan 1, When the centrifugal fan 1 is in operation, the hot air flows out from the air outlet of the base and enters the interior of the box 10 through the air inlet 8 of the cooling system, and then passes through the oil and gas filter device and the heat exchange device 2 to obtain cold air. The air outlet 7 flows out through the air inlet of the frame and enters the inside of the generator.

Further, the oil and gas filter device 3 and the heat exchange device 2 are respectively fixed inside the box body 10 by bolts. Among them, the oil and gas filter device 3 is mainly used to absorb the particulate impurities carried by the filtered air after passing through the generator. Multiple groups of filter cottons or oil and gas separators can be set inside it, which is convenient for disassembly and maintenance on the premise of ensuring the space of the generator set.

Further, the angle of the air outlet of the volute in the centrifugal fan 1 is adapted to the angle of the air inlet of the machine base to ensure a smooth cooling air passage. Specifically, as shown in FIG. 4 , the offset angle θ of the volute is 12.31°, which can effectively avoid air path conflicts.

Further, a temperature sensor A is installed at the air outlet of the machine base and the air inlet of the machine base, and the temperature sensor A is installed at the air outlet of the machine base and the air inlet of the machine base through the installation interface, so that the generator can be monitored in real time when it is running. Air temperature at the air inlet/outlet.

Preferably, as shown in Figures 5-6, the square rib plate of the machine base is changed to a round rib plate, which can effectively avoid eddy currents and make the air path smoother; The hot air enters the heat exchange device 2 uniformly, so as to improve the utilization rate and heat exchange efficiency of the heat exchange core in the heat exchange device 2 . Specifically, the air guide plates are welded at the air inlet of the cooling system of the box body 10, the number is one or more, the shape is a circular plate or a right-angle plate, and the material is ordinary steel plate.

Further, the heat exchange device 2 is provided with a cooling liquid water inlet 4 and a cooling liquid water outlet 5, and the cooling liquid water outlet 5 is connected with the stator water jacket water outlet through a return pipe 6; the cooling liquid water inlet 4, cooling The liquid water outlets 5 are respectively installed with connection flanges, and the connection flange surfaces are provided with installation interfaces for installing a temperature sensor B, which is used for real-time monitoring of the temperature of the cooling liquid in and out.

Preferably, the return pipe 6 is composed of a hose and flanges at both ends. Through the flanges, one end is connected to the cooling liquid outlet 5, and the other end is connected to the water outlet of the stator water jacket, which is conducive to saving engine room space and facilitating unified management of the unit.

Further, the heat exchange device 2 includes a heat exchange core, and the heat exchange core is a plate-fin type air-water heat exchange core made of aluminum alloy, which has the characteristics of high heat exchange efficiency, light weight and corrosion resistance. Specifically, the plate-fin type air-water heat exchange core is placed inside the box body 10, and is fixed to the box body 10 by bolts, and the structure is simple to disassemble and assemble.

Further, the bottom side of the heat exchange device 2 is respectively provided with a leakage alarm 9 and a discharge interface for monitoring the leakage of the cooling liquid, which has high reliability; the top of the heat exchanger 2 is also provided with a The exhaust valve 12 is used to ensure the safety of the heat exchange work of the heat exchanger 2 .

Further, the number of the centrifugal fans 1 is two, and each centrifugal fan 1 includes a motor, an impeller, a volute and a collector.

Further, as shown in FIG. 7 , the box body 10 adopts a split structure. If the top of the generator base and the radial space are insufficient, the rear end box body of the box body 10 of the cooling system and the box body where the heat exchange device 2 is located can be designed It is a split structure, that is, the box body 10 of the cooling system is a three-stage structure, which can greatly improve the maintenance and maintenance efficiency. If the top of the generator base and the radial space are sufficient, the heat exchange core in the heat exchange device 2 is designed as a plug-in structure, which can reduce the manufacturing cost while ensuring maintainability.

The specific working process of the cooling system is as follows:

Referring to Figures 2-3, the cooling system is installed on the top of the generator base 10 by bolts through the connection flanges at the air inlet and the air outlet of the base. When the centrifugal fan 1 is working, the cold air after passing through the heat exchange device 2 enters the impeller space in the axial direction, accelerates under the drive of the high-speed rotating impeller, is collected and guided by the volute and the collector, and then decelerates and changes the flow direction. , enter the generator, take away the generator heat through the air gap, the hot air enters the cooling system through the air outlet of the base, and gets cold air after passing through the oil and gas filter device 3 and the heat exchange core.

To sum up, the cooling system provided by the present invention has built-in components such as centrifugal fan 1, heat exchange device 2 and oil and gas filter device 3, which can be installed on the top of generator base 11, as shown in FIG. 2, its structure is simple and easy Disassemble and assemble to reduce the axial length of the engine room; through the oil and gas filter device 3, the air temperature sensor, the water temperature sensor and the leakage alarm 9, etc., the reliability of the generator operation can be improved; by designing the volute air outlet of the centrifugal fan 1 The structure is adapted to the angle of the air inlet of the base, which can optimize the cooling air path, and the cooling liquid can directly act on the heat source, which has the advantages of small energy transfer path and high cooling efficiency.

The above descriptions are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims (10)

1. A cooling system for a semi-direct drive wind generator, characterized in that it comprises a box (10) installed on the top of the generator base (11); the bottom of the box (10) is provided with a cooling system inlet. an air outlet (8) and a cooling system air outlet (7), and the cooling system air inlet (8) and the cooling system air outlet (7) are arranged oppositely; oil and gas filtering devices (3) are sequentially distributed in the box (10) ), the heat exchange device (2) and the centrifugal fan (1), when the centrifugal fan (1) is working, the hot air flows out from the air outlet of the base and enters the box (10) through the air inlet (8) of the cooling system Inside, cold air is obtained after passing through the oil and gas filter device (3) and the heat exchange device (2) in sequence, and the cold air flows out from the air outlet (7) of the cooling system and enters the generator interior through the air inlet of the machine base. 2 . The cooling system of the semi-direct drive wind turbine according to claim 1 , wherein the oil and gas filtering device ( 3 ) and the heat exchange device ( 2 ) are respectively fixed inside the box ( 10 ) by bolts. 3 . 3. The cooling system of the semi-direct drive wind turbine according to claim 2, characterized in that, a plurality of groups of filter cottons or oil and gas separators are arranged in the oil and gas filtering device (3). 4 . The cooling system for a semi-direct drive wind turbine according to claim 1 , wherein the angle of the air outlet of the volute in the centrifugal fan ( 1 ) is adapted to the angle of the air inlet of the machine base. 5 . 5 . The cooling system of the semi-direct drive wind generator according to claim 1 , wherein a temperature sensor A is installed at the air outlet of the machine base and the air inlet of the machine base, respectively. 6 . 6. The cooling system of the semi-direct drive wind turbine according to claim 1, wherein the heat exchange device (2) is provided with a cooling liquid inlet (4) and a cooling liquid outlet (5), so The cooling liquid water outlet (5) is connected with the water outlet of the stator water jacket through a water return pipe (6). 7 . The cooling system of the semi-direct-drive wind power generator according to claim 6 , wherein the heat exchange device ( 2 ) comprises a heat exchange core, and the heat exchange core is a plate made of aluminum alloy. 8 . Fin-type air-water heat exchange core. 8 . The cooling system of the semi-direct drive wind turbine according to claim 6 , wherein the cooling liquid water inlet ( 4 ) and the cooling liquid water outlet ( 5 ) are respectively provided with connecting flanges, and the connecting The flange surface is provided with a mounting interface for mounting the temperature sensor B. 9 . The cooling system of the semi-direct drive wind power generator according to claim 1 , wherein the bottom side of the heat exchange device ( 2 ) is respectively provided with a leakage alarm ( 9 ) and a discharge interface. 10 . 10. The cooling system for a semi-direct drive wind turbine according to claim 1, wherein the number of the centrifugal fans (1) is two, and each centrifugal fan (1) comprises a motor, an impeller , volute and collector; When the centrifugal fan (1) is working, the cold air after passing through the heat exchange device (2) enters the impeller space in the axial direction, and is accelerated under the drive of the high-speed rotating impeller, and is collected and guided by the volute and the collector. Decelerate and change the flow direction, enter the generator, take away the generator heat through the air gap, the hot air enters the cooling system through the air outlet of the base, and gets cold air after passing through the oil and gas filter device (3) and the heat exchange device (2).

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