CN112821673A

CN112821673A - Wind power generator

Info

Publication number: CN112821673A
Application number: CN202110210154.3A
Authority: CN
Inventors: 程相雷; 尹梦雪; 王洪波; 张东波
Original assignee: Beijing Sany Intelligent Motor Co Ltd
Current assignee: Beijing Sany Intelligent Motor Co Ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2021-05-18

Abstract

The present invention provides a wind power generator, comprising: the motor comprises a base, wherein a stator-rotor assembly is arranged in the base and comprises a rotor shaft, and two ends of the rotor shaft extend out of the base; the axial flow fans are positioned in the base, are arranged on the rotor shaft and can rotate together with the rotor shaft; the guide device is arranged at the top of the base, a plurality of air inlets communicated with the air inlet side of the axial flow fan are formed in the side wall of the guide device, and an air outlet communicated with the air outlet side of the axial flow fan is formed in one side wall of the guide device. The wind driven generator provided by the invention has the advantages of simple structure, high strength, no need of an external power supply, low failure rate and no need of maintenance. And the axial flow fan is arranged on the rotor shaft, so that the problems of small rotating speed range and low efficiency at low wind speed of a common cooling fan are solved, and the control is not needed. In addition, the invention can directly suck cooling air from the outside without heat exchange of a cooling pipe, thereby saving materials and reducing the cost and the weight of the motor.

Description

Wind power generator

Technical Field

The invention relates to the technical field of wind power generation, in particular to a wind driven generator.

Background

In the current wind power generator, a cooler is mounted on the top of the generator as a mainstream cooling method for the wind power generator. Among them, air cooling and water cooling may be used depending on the cooling medium. Both media generally need external power to push, and air cooling depends on a fan at the front end of a cooler, and water cooling depends on a water pump and an external radiator.

However, both air cooling and water cooling have disadvantages of many parts, complicated control, high failure rate, and the like. Therefore, it is necessary to design a new cooling structure of a wind turbine to solve the above problems.

Disclosure of Invention

The invention provides a wind driven generator, which is used for solving the defects of more parts, complex control and high failure rate in the prior art and realizing the effects that the wind driven generator does not need to rely on an external cooler, and a cooling medium flows without relying on an external power supply and without control.

The present invention provides a wind power generator, comprising: the rotor assembly comprises a rotor shaft, and two ends of the rotor shaft extend out of the base; the axial flow fans are positioned in the base, are arranged on the rotor shaft and can rotate together with the rotor shaft; the guide device is arranged at the top of the base, a plurality of air inlets communicated with the air inlet side of the axial flow fan are formed in the side wall of the guide device, and an air outlet communicated with the air outlet side of the axial flow fan is further formed in one side wall of the guide device.

According to the wind driven generator provided by the invention, the rotor shaft comprises a body, and a driving end and a non-driving end which are positioned at two ends of the body, wherein the driving end is positioned outside the base and is used for being connected with an external part, the non-driving end is positioned outside the base and is connected with a collecting ring assembly part, the stator-rotor assembly comprises a stator and a rotor, the rotor comprises the rotor shaft and a rotor core sleeved on the rotor shaft, the stator comprises a stator core sleeved outside the rotor core and stator inserting lines positioned at two ends of the stator core, and the axial flow fan is arranged on the body of the rotor shaft and is positioned at the outer side of the rotor core.

According to the wind driven generator provided by the invention, a plurality of air guide hoods are further installed in the base, wherein each air guide hood and the inner surface of the base form an air guide channel together, the bottom surface of each air guide hood is positioned above the axial flow fan and is arranged at intervals with the axial flow fan, and each air guide channel is communicated with one air inlet and the air inlet side of the axial flow fan.

According to the wind driven generator provided by the invention, the air guide sleeve is provided with a top side communicated with the air inlet, and the top side of the air guide sleeve forms a tapered open structure.

According to the wind driven generator provided by the invention, the stator core is installed on the base in a matching way through the base ring plate, and a plurality of vent holes are formed in the base ring plate.

According to the wind driven generator provided by the invention, the baffle plate is arranged in the flow guide device and divides the interior of the flow guide device into an air inlet area and an air outlet area, wherein the air inlet is communicated with the air inlet area and communicated with the air inlet side of the axial flow fan through the air inlet area, and the air outlet is communicated with the air outlet area and communicated with the air outlet side of the axial flow fan through the air outlet area.

According to the wind driven generator provided by the invention, the air exhaust area is positioned above the stator and the rotor in the stator-rotor assembly, and the air inlet area is positioned outside the air exhaust area.

According to the wind driven generator provided by the invention, the air exhaust area is divided into a vertical induced air area connected with the air exhaust side of the axial flow fan and a transverse induced air area communicated with the vertical induced air area and the air exhaust port by the partition plate.

According to the wind driven generator provided by the invention, a filter screen is further installed at the position of each air inlet on the side wall of the flow guide device.

According to the wind driven generator provided by the invention, end covers are respectively arranged on two opposite sides of the base, and two ends of the rotor shaft are respectively arranged on the end covers through bearing units.

In the wind power generator provided by the invention, a plurality of axial flow fans are arranged on the rotor shaft of the stator-rotor assembly, and the axial flow fans can rotate along with the rotation of the rotor shaft. Furthermore, an air inlet communicated with the air inlet side of the axial flow fan and an air outlet communicated with the air outlet side of the axial flow fan are formed on the flow guide device. Therefore, during the actual operation of the wind driven generator, the rotor shaft can drive the axial flow fan to rotate simultaneously when running, air entering from the air inlet can flow to the stator and rotor assembly under the action of the axial flow fan to cool the stator and rotor assembly, and then the air is discharged from the air outlet. Therefore, the wind driven generator provided by the invention has the advantages of simple structure, high strength, no need of an external power supply, low failure rate and no need of maintenance. And the axial flow fan is arranged on the rotor shaft, so that the problems of small rotating speed range and low efficiency at low wind speed of a common cooling fan are solved, and the control is not needed. In addition, the invention can directly suck cooling air from the outside without heat exchange of a cooling pipe, thereby saving materials and reducing the cost and the weight of the motor.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is one of the schematic cross-sectional views of a wind turbine provided by the present invention;

FIG. 2 is a second schematic cross-sectional view of a wind turbine provided in the present invention, in which a flow path of cooling wind is shown;

reference numerals:

100: a wind power generator; 102: a machine base;

104: a stator-rotor assembly; 106: an axial flow fan;

108: a flow guide device; 110: a rotor shaft;

112: an air inlet; 114: an air outlet;

116: a stator; 118: a rotor;

120: a rotor core; 122: a stator core;

124: inserting a stator wire; 126: a slip ring assembly;

128: a pod; 130: a partition plate;

132: a filter screen; 134: an end cap;

136: a bearing unit; s: a flow guide channel;

p1: an air intake area; p2: an air exhaust area;

a to D: a path.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

An embodiment of the present invention will now be described with reference to fig. 1 and 2. In particular, fig. 1 shows one of the schematic cross-sectional views of a wind power generator provided by the present invention. Fig. 2 shows a second schematic cross-sectional view of a wind turbine provided by the present invention, in which a flow path of cooling wind is shown. However, it should be understood that the following description is only exemplary embodiments of the present invention and does not constitute any particular limitation of the present invention.

As shown in fig. 1 and 2, an embodiment of the present invention provides a wind power generator 100. The wind turbine 100 may generally include a housing 102, a stator-rotor assembly 104, a plurality of axial fans 106, and a flow guide 108.

Specifically, the stator and rotor assemblies 104 may be mounted within the housing 102. The stator-rotor assembly 104 includes a rotor shaft 110, and both ends of the rotor shaft 110 may extend out of the housing 102. Axial fan 106 may also be located within housing 102 and mounted on rotor shaft 110. During actual operation, axial fan 106 is able to rotate in unison with the rotation of rotor shaft 110. In other words, rotation of rotor shaft 110 causes axial fan 106 mounted thereon to rotate together. In one embodiment of the present invention, axial fan 106 may be mounted on rotor shaft 110 by, for example, shrink-fit.

Further, in embodiments of the present invention, the deflector 108 may be mounted on top of the housing 102. Specifically, as shown in fig. 1, a plurality of air inlets 112 communicating with the air inlet side of the axial fan 106 may be formed on the side wall of the air guide 108. In addition, an air outlet 114 communicating with the air outlet side of the axial flow fan 106 may be formed on one of the side walls of the deflector 108.

During actual operation, cooling air enters the deflector 108 through the air inlet 112 and is then drawn into the housing 102 by the operating axial fan 106, thereby cooling the components of the stator and rotor assemblies 104. The cooled exhaust air enters the deflector 108 again and is further exhausted through the exhaust port 114.

Thus, during actual operation of wind turbine 100, axial fan 106 is simultaneously rotated when rotor shaft 110 is in operation. Air entering from the air inlet 112 flows to the stator and rotor assemblies 104 by the axial fan 106 to cool the stator and rotor assemblies 104, and then is exhausted from the air outlet 114. Therefore, the wind driven generator 100 provided by the invention has the advantages of simple structure, high strength, no need of an external power supply, low failure rate and no need of maintenance. And axial fan 106 is installed on rotor shaft 110, has solved the problem that ordinary cooling blower rotational speed range is little, inefficiency under the low wind speed and need not control. In addition, the invention can directly suck cooling air from the outside without heat exchange of a cooling pipe, thereby saving materials and reducing the cost and the weight of the motor.

In an alternative embodiment of the present invention, a filter screen 132 may be further installed on the sidewall of the deflector 108 at the position of each air inlet 112. This allows the outside airflow to be filtered by the filter 132 as it enters the intake vent 112.

As further shown in fig. 1, in an embodiment of the present invention, the stator-rotor assembly 104 may include a stator 116 and a rotor 118. Specifically, the rotor 118 includes the rotor shaft 110 as described above and the rotor core 120 fitted around the rotor shaft 110. The stator 116 includes a stator core 122 sleeved outside the rotor core 120 and stator insert wires 124 positioned at both ends of the stator core 122.

For rotor shaft 110, it may include a body and a drive end (e.g., left end in FIG. 1) and a non-drive end (e.g., right end in FIG. 1) at both ends of the body. In actual assembly, the drive end is located outside the housing 102 and is used for connection to external components. While the non-driven end is also located outside of the housing 102 and is connected to the slip ring assembly 126.

In particular installation, axial fan 106 may be mounted on the body of rotor shaft 110, and axial fan 106 may be located outside rotor core 120. For example, two axial fans 106, referred to as drive-side axial fans and non-drive-side axial fans, respectively, may be included in the embodiment shown in FIG. 1. A drive-end axial fan is disposed on the body of the rotor shaft 110 adjacent the drive end of the rotor shaft 110, such as axial fan 106 on the left side of FIG. 1; a non-drive end axial fan is disposed on the body of the rotor shaft 110 adjacent to the non-drive end of the rotor shaft 110, such as the right-hand axial fan 106 in fig. 1.

When assembled, each axial fan 106 is located outside rotor core 120. In other words, in the embodiment shown in fig. 1, rotor core 120 is located between the drive-end axial flow fan and the non-drive-end axial flow fan. In this way, the axial fan 106 can guide the air flow to cool the components of the stator and rotor assembly 104 by the driving end and the non-driving end respectively, so that the cooling effect is better.

In addition, in one embodiment of the present invention, end caps 134 may be mounted on opposite sides of the housing 102. Specifically, both ends of the rotor shaft 110 may be respectively mounted on the corresponding end caps 134 through bearing units 136. In the embodiment shown in fig. 1, the end cap 134 may similarly include a drive end cap (e.g., left end in fig. 1) and a non-drive end cap (e.g., right end in fig. 1). Correspondingly, the bearing unit 136 may similarly include a drive end bearing unit (e.g., left end in fig. 1) and a non-drive end bearing unit (e.g., right end in fig. 1).

With continued reference to fig. 1, in one embodiment of the present invention, a plurality of fairings 128 may also be mounted inside the housing 102. In this embodiment, the number and location of the air scoops 128 may correspond to and match the number and location of the air intakes 112 to direct the airflow entering the air intakes 112. Specifically, the bottom surface of the nacelle 128 may be positioned above the axial fan 106 and spaced from the axial fan 106 such that the shape of the nacelle 128 matches the profile of the axial fan 106 and does not affect the normal rotation of the axial fan 106. Further, in an embodiment of the present invention, each of the fairings 128 may respectively form a fairway S together with an inner surface of the base 102. Each of the guiding channels S may be respectively communicated with one of the corresponding air inlets 112 and the air inlet side of the axial fan 106, so that the air flow entering the air inlets 112 can enter the air inlet side of the axial fan 106 along the guiding channels S for cooling.

In an alternative embodiment of the present invention, as shown in FIG. 1, a top side of the pod 128 communicates with the intake vent 112, and the top side of the pod 128 may form a tapered open structure. The design of the tapered open structure is more beneficial to converging and guiding the airflow. It should of course be understood that the shapes described above are merely illustrative and do not constitute any particular limitation of the invention.

Further, in an alternative embodiment of the present invention, the stator core 122 may be fittingly mounted to the housing 102 by a housing ring plate (not shown). Further, a plurality of vent holes are formed on the base ring plate. During actual operation, the cooling air may pass through the end of the rotor 118, the end of the stator coil 124, and through the vent holes to form an end cooling air path, and then enter the middle air outlet channel of the air guide device 108, and discharge the hot air outside the motor. This process will be described in detail below in conjunction with fig. 2.

With continued reference to fig. 1, in an embodiment of the present invention, the interior of the deflector 108 may be provided with a baffle 130. Specifically, the partition 130 may partition the interior of the deflector 108 into an intake area P1 and an exhaust area P2. The partition 130 divides the inside of the deflector 108, so that the inside of the deflector 108 can simultaneously realize the air intake and exhaust functions, and the areas through which the air intake and exhaust functions pass do not affect each other, and there is no interference.

Specifically, in the embodiment shown in FIG. 1, the intake vent 112 may communicate with the intake area P1 and with the intake side of the axial fan 106 via the intake area P1. Correspondingly, the exhaust outlet 114 may communicate with the exhaust region P2 and with the exhaust side of the axial fan 106 via the exhaust region P2. Therefore, the layout structure shown in figure 1 is formed, and the air intake and exhaust processes are not interfered mutually.

In an alternative embodiment of the present invention, the venting region P2 may be located above the stator 116 and rotor 118 in the stator and rotor assembly 104, and the intake region P1 may be located outside of the venting region P2. In this way, the airflow after cooling the stator 116 and the rotor 118 can directly enter the upper exhaust area P2 and be guided out by the exhaust outlet 114, so that the cooling effect is better and the spatial layout is more reasonable. In the embodiment shown in fig. 1, since the plurality of air intakes 112 are provided, it can be understood that the air intake area P1 is surrounded on the outer circumference of the discharge area P2.

As further shown in fig. 1, in an alternative embodiment of the present invention, a partition 130 may divide the discharge area P2 into a vertical induced draft area and a lateral induced draft area. Specifically, the vertical induced air region may interface with the discharge side of the axial fan 106, thereby directing the air flow discharged from the discharge side of the axial fan 106 upward. And the lateral induced air region may communicate the vertical induced air region and the air outlet 114, so that the discharged air is laterally guided to be discharged to the outside of the wind power generator 100 through the air outlet 114. It should be understood, of course, that the configuration shown in fig. 1 is an exemplary embodiment only, and does not constitute any particular limitation to the present invention.

Referring now to FIG. 1 in conjunction with FIG. 2, in one embodiment of the present invention, the rotor 118 may be positioned horizontally within the housing 102 during actual assembly. The end caps 134 at the drive end and the end caps 134 at the non-drive end are mounted at the front and rear ends of the housing 102, respectively. A bearing unit 136 at the driving end and a bearing unit 136 at the non-driving end are mounted on the end caps 134 at both ends, respectively.

Further, the filter net 132 may be installed on both side surfaces and a front end surface of the deflector 108. The pod 128 at the drive end and the pod 128 at the non-drive end are mounted to the base 102 at the corresponding stops of the ring plate. The axial flow fan 106 at the drive end and the axial flow fan 106 at the non-drive end are shrink-fitted over the rotor shaft 110.

In addition, the deflector 108 is placed on top of the housing 102. Specifically, the baffle 130 (e.g., a steel plate) is welded to form two isolated areas of the inlet air and the outlet air (i.e., the inlet air area P1 and the outlet air area P2) in the air guide device 108, so as to separate the inlet air and the outlet air from each other, thereby forming an isolated channel of the cooling air path. In the embodiment of the present invention, the stator core 122 and the rotor core 120 may each employ a segmented core, for example.

In the embodiment shown in fig. 1 and fig. 2, the air path structure of the wind turbine 100 may be symmetrically distributed at both ends, and includes an air inlet path structure and an air outlet path structure.

Specifically, as shown in fig. 2, the cooling air path adopts a symmetrical dual-air-path cooling structure, and both ends of the cooling air path include axial ventilation wind pressure elements, i.e., an axial flow fan 106 at the driving end and an axial flow fan 106 at the non-driving end, which can rotate together with the rotor shaft 110 to generate wind pressure, thereby driving the air to flow.

During actual operation, wind turbine 100 may draw cooling air directly from the ambient environment. The cooling wind flow path inside the wind power generator 100 may include:

path a: an axial cooling wind flow path of rotor shaft 110;

and a path B: a cooling wind rotor radial flow path between the side surfaces of the adjacent two sections of rotor cores 120;

and a path C: a cooling wind stator radial flow path between the side surfaces of two adjacent sections of stator cores 122, wherein the paths B and C are arranged in the radial direction of the rotor core 120 and the stator core 122 in a one-to-one correspondence, and the corresponding paths B and C are mutually communicated;

route D: a plurality of vent holes are formed in a ring plate of the base 102, which is fitted to the stator core 122, so that cooling air passes through an end of the rotor 118 and an end of the stator insert wire 124, and an end cooling air path is formed through the vent holes. And then the cooling air enters the air outlet channel at the middle part of the flow guide device 108, and the hot air is discharged out of the motor.

In summary, in the wind turbine 100 provided by the present invention, the inner wind path adopts the symmetrical dual wind path cooling flow channels, and the cooling medium driving manner with the axial flow fan greatly reduces the temperature of the motor winding, and achieves the purpose of improving the reliability of the cooling system of the wind turbine. In other words, the wind turbine 100 provided by the present invention has the following advantages:

"reliable": the self-cooling structure is simple, the strength is high, no electric device is used, and maintenance is not needed;

the 'high efficiency': the low load loss matched with the rotating speed of the generator improves the efficiency of the motor;

the 'good quality': cooling medium is directly sucked from the outside, heat exchange is not needed, and hot air is directly discharged out of the motor; the motor winding is fully cooled, hot air circulation is prevented from entering the motor, and product quality is improved.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A wind power generator, comprising:

the rotor assembly comprises a rotor shaft, and two ends of the rotor shaft extend out of the base;

the axial flow fans are positioned in the base, are arranged on the rotor shaft and can rotate together with the rotor shaft;

the guide device is arranged at the top of the base, a plurality of air inlets communicated with the air inlet side of the axial flow fan are formed in the side wall of the guide device, and an air outlet communicated with the air outlet side of the axial flow fan is further formed in one side wall of the guide device.

2. The wind generator of claim 1, wherein the rotor shaft includes a body and a drive end and a non-drive end at both ends of the body,

wherein the driving end is positioned outside the engine base and is used for connecting with an external part, the non-driving end is positioned outside the engine base and is connected with a collector ring assembly,

wherein the stator-rotor assembly comprises a stator and a rotor, the rotor comprises a rotor shaft and a rotor core sleeved on the rotor shaft, the stator comprises a stator core sleeved outside the rotor core and stator embedded lines positioned at two ends of the stator core,

the axial flow fan is installed on the body of the rotor shaft and located on the outer side of the rotor core.

3. The wind power generator as claimed in claim 1, wherein a plurality of fairings are further installed inside the housing,

each flow guide cover and the inner surface of the base form a flow guide channel together, the bottom surface of each flow guide cover is positioned above the axial flow fan and arranged at intervals with the axial flow fan, and each flow guide channel is communicated with one of the air inlets and the air inlet side of the axial flow fan.

4. The wind generator of claim 3, wherein the pod has a top side in communication with the air inlet, and wherein the top side of the pod forms a tapered open structure.

5. The wind power generator of claim 2, wherein the stator core is fittingly mounted to the housing by a housing ring plate, and a plurality of ventilation holes are formed in the housing ring plate.

6. The wind power generator according to claim 1, wherein a partition is provided inside the deflector to partition the inside of the deflector into an intake area and an exhaust area,

the air inlet is communicated with the air inlet area and communicated with the air inlet side of the axial flow fan through the air inlet area, and the air outlet is communicated with the air exhaust area and communicated with the air exhaust side of the axial flow fan through the air exhaust area.

7. The wind generator of claim 6, wherein the wind exhaust region is located above the stator and rotor in the stator and rotor assembly, and the wind intake region is located outside the wind exhaust region.

8. The wind power generator according to claim 6, wherein the partition plate partitions the discharge area into a vertical induced air area that meets a discharge side of the axial flow fan, and a lateral induced air area that communicates the vertical induced air area and the discharge outlet.

9. The wind power generator according to any one of claims 1 to 8, wherein a filter screen is further installed on a side wall of the deflector at a position of each of the wind inlets.

10. Wind turbine according to any of claims 1 to 8, wherein end caps are further mounted on opposite sides of the housing, respectively, and wherein both ends of the rotor shaft are mounted on the end caps through bearing units, respectively.