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EP-3845759-B1 - MOTOR, HEAT EXCHANGE DEVICE FOR SHAFT SYSTEM THEREOF, AND WIND TURBINE SET

EP3845759B1EP 3845759 B1EP3845759 B1EP 3845759B1EP-3845759-B1

Inventors

  • MA, Shengjun

Dates

Publication Date
20260506
Application Date
20190829

Claims (11)

  1. A generator shaft system, comprising a generator rotating shaft (202), a generator fixed shaft (201), and a generator bearing (203) arranged between the generator rotating shaft (202) and the generator fixed shaft (201), wherein the generator shaft system further comprises a heat exchange device, the heat exchange device comprises a flexible chamber (20) into which a cooling medium is allowed to be introduced, and wherein the flexible chamber (20) is located on an inner wall of the generator rotating shaft (202), wherein the flexible chamber (20) is annular-shaped and is arranged on an annular inner wall of a rotary portion (202b) of the generator rotating shaft (202), wherein the heat exchange device further comprises a limiting ring (30) made of a hard material, the limiting ring (30) is located at an inner side of the flexible chamber (20); a radial inner boundary of the flexible chamber (20) is defined by the limiting ring (30), to allow the flexible chamber (20) to be inflated and fitted to the annular inner wall of the rotary portion (202b) after being filled with the cooling medium; or, an outer wall of the flexible chamber (20) is provided with an adhesive surface configured to be adhered to the annular inner wall of the rotary portion (202b), the annular inner wall of the rotary portion (202b), the limiting ring (30) and the flexible chamber (20) form a structure similar to a tire, wherein the heat exchange device further comprises a vortex separator (10), the vortex separator (10) comprising a jet pipe (102) and a vortex separation tube (101), wherein the vortex separation tube (101) comprises a vortex chamber (101a), and a cold end pipe section (101c) and a hot end pipe section (101b) located at two ends of the vortex chamber (101a) respectively; the jet pipe (102) is in communication with the vortex chamber (101a), and compressed gas flow forms spiral gas flow through the jet pipe (102) and flows into the vortex chamber (101a) in a tangential direction of the vortex chamber (101a); and wherein a cross-sectional area of the cold end pipe section (101c) is smaller than a cross-sectional area of the vortex chamber (101a), and a cross-sectional area of the hot end pipe section (101b) is equal to or greater than the cross-sectional area of the vortex chamber (101a); a valve having a valve port is arranged inside the hot end pipe section (101b), the valve has a cone-shaped surface, and after the spiral gas flow enters the vortex separation tube (101), external gas flow of the spiral gas flow is allowed to flow toward the valve port, be gradually heated to become hot gas flow, and then flow out through the valve port; central gas flow of the spiral gas flow is allowed to pass by the cone-shaped surface of the valve and flow back, be cooled to become cold gas flow, and then flow out from the cold end pipe section (101c), to serve as the cooling medium to be conveyed to the flexible chamber (20); and the heat exchange device further comprises a compressor (70), and the compressor (70) is configured to provide compressed gas flow to the vortex separator (10), wherein a gas-liquid separator (60) is arranged upstream of the compressor (70), wherein the gas-liquid separator (60) comprises a separation cylinder (603) and an inlet end (602) arranged at a side wall of the separation cylinder (603), and gas flow tangentially flows into the separation cylinder (603) through the inlet end (602); an inner wall of the separation cylinder (603) is provided with a plurality of protrusions (603b) and/or recessions (603c); an upper portion of the inner wall of the separation cylinder (603) is provided with an opening for the gas flow to flow out after liquid being separated from the gas flow, wherein the gas-liquid separator (60) further comprises a concave top lid (601) arranged at a top of the separation cylinder (603), the concave top lid (601) is recessed inwards, and an inner surface of the concave top lid (601) is provided with a plurality of protrusions (601a); and a bottom of the separation cylinder (603) is provided with a water guide blade grid (604).
  2. The generator shaft system according to claim 1, wherein the limiting ring (30) is formed by splicing at least two limiting ring segments along a circumferential direction, and the limiting ring segments are connected through an expansion hoop (30a).
  3. The generator shaft system according to claim 1, the heat exchange device further comprises a fluid slip ring (50), and an input pipe (50a) and an output pipe (50b) which are in communication with the fluid slip ring (50), wherein the input pipe (50a) is configured to convey the cooling medium to the flexible chamber (20), and the cooling medium in the flexible chamber (20) is outputted through the output pipe (50b).
  4. The generator shaft system according to claim 1, wherein a mounting position of the flexible chamber (20) corresponds to or partially overlaps a mounting position of the generator bearing (203) in a radial direction.
  5. The generator shaft system according to claim 1, wherein the flexible chamber (20) is provided with an input port and an output port, the input port is configured for introducing the cooling medium into the flexible chamber (20), and the output port is configured for discharging, after the cooling medium absorbs heat of the generator shaft system and becomes a high-temperature medium, the high-temperature medium out of the flexible chamber (20); or, the flexible chamber (20) is provided with an input/output port configured for introducing the cooling medium into the flexible chamber (20) and discharging, after the cooling medium absorbs heat of the generator shaft system and becomes a high-temperature medium, the high-temperature medium out of the flexible chamber (20).
  6. The generator shaft system according to claim 1 or 5, wherein the flexible chamber (20) is fixed on the inner wall of the generator rotating shaft (202) through a mechanical fixing member or a support limiting member, cubical expansion occurs after the flexible chamber (20) is filled with the cooling medium, and the flexible chamber (20) after cubical expansion is in direct and close contact with the inner wall of the generator rotating shaft (202); or, the flexible chamber (20) is fixedly bonded to the inner wall of the generator rotating shaft (202), and the flexible chamber (20) is in direct and close contact with the inner wall of the generator rotating shaft (202); or, a heat conducting gasket is arranged between the flexible chamber (20) and the inner wall of the generator rotating shaft (202), to make the flexible chamber (20) in indirect and close contact with the inner wall of the generator rotating shaft (202).
  7. The generator shaft system according to claim 1, wherein the flexible chamber (20) comprises a first flexible sub-chamber and a second flexible sub-chamber which are in close contact with each other; the first flexible sub-chamber is filled with a cooling liquid, the cooling liquid is hermetically stored in the first flexible sub-chamber, and the first flexible sub-chamber is in contact with the inner wall of the generator rotating shaft (202); and the second flexible sub-chamber is filled with cooling gas flow, and the second flexible sub-chamber has an input port and an output port; the cooling gas flow is continuously inputted through the input port of the second flexible sub-chamber, and hot gas flow formed by the cooling gas flow absorbing heat of the first flexible sub-chamber is continuously outputted through the output port of the second flexible sub-chamber, to cool the first flexible sub-chamber.
  8. A wind turbine, comprising a generator, wherein the generator comprises a rotor, a stator and a generator shaft system according to any one of claims 1 to 7.
  9. The wind turbine according to claim 8, wherein in a case that the heat exchange device of the generator shaft system comprises a vortex separator (10), the vortex separator (10) is arranged on a base (1001) of the wind turbine, and the base (1001) is arranged inside a nacelle; or, the vortex separator (10) is arranged on an inner wall of a tower of the wind turbine.
  10. The wind turbine according to claim 9, further comprising a hub (500), wherein a second vortex separator, which is the same with the vortex separator (10), is arranged on the hub (500), hot gas flow and cold gas flow of the second vortex separator are distributed as follows: the cold gas flow is conveyed to at least one of the flexible chamber (20), a servo controller (503), a pitch bearing (501), a servo motor (502), the hub (500) and a yaw bearing (80) through pipelines; and/or, the hot gas flow is conveyed to at least one of a leading edge of the blade (700), a trailing edge of the blade (700), the hub (500), the pitch bearing (501), a wind gauge support (1002) on an upper portion of the nacelle (100), and the yaw bearing (80) through pipelines.
  11. A generator, comprising a generator shaft , system according to any one of claims 1 to 10.

Description

The present application claims the priority to Chinese Patent Application No. 201811014796.0, titled "GENERATOR, HEAT EXCHANGE DEVICE FOR SHAFT SYSTEM THEREOF, AND WIND TURBINE", filed with the China National Intellectual Property Administration on August 31, 2018. FIELD The present application relates to the technical field of electrical equipment cooling, and in particular to a generator, a heat exchange device for a shaft system of the generator, and a wind turbine. BACKGROUND Referring to Figures 1 and 2, Figure 1 is a schematic view of an overall layout of a whole machine in which an inside of a generator is cooled by an air surface heat exchanger; and Figure 2 is an exploded schematic view showing the structure of the surface heat exchanger in Figure 1. As shown in Figure 1, one side of the generator 500' (the right side as shown in Figure 1) is connected to a rotor 600', and the other side (the left side as shown in Figure 1) is provided with a nacelle 100', and a surface heat exchanger 300' is arranged in the nacelle 100', specifically at a tail of the nacelle 100'. An internal circulation induced draft fan 202' is provided at the left side of the surface heat exchanger 300', and the internal circulation induced draft fan 202' is driven by an internal circulation driving motor 201'. A drawing and conveying pipe for the internal circulation airflow 400' is further provided. The hot airflow generated by the generator 500' enters, under the action of the internal circulation induced draft fan 202', into the heat exchanger core of the surface type heat exchanger 300' through the drawing and conveying pipe for the internal circulation airflow 400'. The surface heat exchanger 300' is further provided with an external circulation induced draft fan 102', and the external circulation induced draft fan 102' is driven by an external circulation driving motor 101'. The external circulation induced draft fan 102' introduces the natural ambient airflow into the heat exchange core of the surface heat exchanger 300', and the external circulation airflow after heat exchange flows out of the nacelle 100'. An external circulation air outlet 103' connected to the outside is shown in Figure 1. The internal circulation airflow is cooled and discharged out of the surface heat exchanger 300', and then diffused inside the tail of the nacelle 100' at 360 degrees. In Figure 2, when the internal circulation airflow is introduced, an internal circulation confluence chamber 203' is further provided between the surface heat exchanger 300' and the drawing and conveying pipe for the internal circulation airflow 400', and internal circulation airflow confluence inlets 203a' are provided at both an upper side and a lower side. An inlet connecting section 104' of the external circulation induced draft fan is arranged between the external circulation induced draft fan 102' and the surface heat exchanger 300', and an inlet connecting section 204' of the internal circulation induced draft fan is arranged between the internal circulation induced draft fan 202' and the surface heat exchanger 300'. In Figure 1, a cooling airflow inlet orifice plate 500a' is provided at a housing of the generator 500', which can be understood with reference to Figure 3. Figure 3 is a schematic view showing the cooling airflow inlet orifice plate 500a' in Figure 1. The internal circulation airflow which is cooled by being diffused in the nacelle may enter the generator 500' through an inlet hole 500b' of the cooling airflow inlet orifice plate 500a' and be reused as cooling airflow to cool the iron core of the generator 500'. As shown in Figure 1, a generator bearing is arranged between the generator fixed shaft and the generator rotating shaft of the generator 500'. The generator bearing may generate a lot of heat during operation, however, since the generator bearing is surrounded by the generator fixed shaft and the generator rotating shaft, the heat is difficult to be dissipated. Moreover, the above solution mainly cools the iron core of the generator 500', and there are no suitable solutions for cooling the shaft system of the generator and hub. Among the prior art, D1 (CN 205207057U) discloses a wind generating set cooling system and wind generating set, where a cooling system is provided in the bearing of the main shaft so as to cool the bearing. D2 (SU 143882A1) discloses a cooling system for electrical machines with fluid flowing through the axial channels inside the steel. D3 (US 20020043881A1) discloses an automotive alternator in which a heat-generating portion is cooled by a liquid coolant through the fluid distribution channel. D5 (CN 105736258A) discloses a multiphase flow separating device and a fluid transport device with the multiphase flow separating device, so that clean and dry gas phase media are formed in a separated manner and used for the fluid transport device. D6 (EP 1717468A1) discloses a bearing apparatus, which includes fins form