Wind turbine generator variable pitch system based on high-power variable pitch motor

Abstract

The utility model discloses a wind turbine generator variable pitch system based on a high-power variable pitch motor, and relates to the technical field of wind turbine generators, the wind turbine generator variable pitch system comprises a variable pitch motor, and one end of the variable pitch motor is fixedly provided with a mounting plate; the fan assembly is arranged at the other end of the variable-pitch motor; the number of the air ducts is two, and the two air ducts are symmetrically installed on the fan assembly; and the dustproof cover is mounted at the input port of the fan assembly. According to the wind turbine generator variable-pitch system based on the high-power variable-pitch motor, heat conduction mechanisms such as a first heat dissipation assembly and a second heat dissipation assembly are arranged in an air duct, a first heat conduction plate is attached to a variable-pitch motor shell, and through a combined structure of cooling fins, a strip-shaped empty groove, a second heat conduction plate and fins, the heat conduction efficiency of the variable-pitch motor is improved; heat in the variable pitch motor can be effectively guided out, rapid heat dissipation is achieved in cooperation with air of the fan, and the heat dissipation effect is remarkably improved compared with an existing mode that heat dissipation is conducted on the motor shell only through an air duct shell and a single fan.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine technology, specifically a wind turbine pitch system based on a high-power pitch motor. Background Technology

[0002] Currently, the KEB pitch motors of the Sinovel SL1500 wind turbine are not equipped with specific cooling devices, relying solely on natural heat dissipation from the environment for cooling. The pitch motors power the turbine blades, generating significant heat during operation, especially in summer or windy seasons when frequent blade angle adjustments are necessary, often resulting in pitch motor temperatures exceeding 90-110°C. Natural heat dissipation refers to cooling an object under natural conditions without external assistance, through conduction, convection, and radiation. However, natural heat dissipation is only suitable for components or equipment with low heat generation. In some turbines, after continuous full-load operation (more than 3 hours), the pitch motors may overheat, rendering natural heat dissipation insufficient and leading to shutdowns, reduced power generation, and economic losses.

[0003] The utility model patent with authorization announcement number CN215979691U discloses a heat dissipation component for a pitch motor of a wind turbine, including a duct housing and a fan. The duct housing is connected to the outer wall of the pitch motor and covers the pitch motor inside it. There is a gap between the duct housing and the pitch motor to form a heat dissipation channel. One end of the duct housing is connected to a fan mounting plate. The fan is installed at the end of the pitch motor and is covered in the semi-enclosed space formed by the duct housing and the fan mounting plate.

[0004] Existing wind turbine pitch motors dissipate heat by adding a duct housing and a fan. While this method improves the heat dissipation effect to some extent, it lacks a heat conduction mechanism within the duct. This means the fan's airflow only cools the pitch motor housing, and its cooling efficiency needs improvement. Furthermore, this cooling system only uses a single fan located on the outside of one end of the pitch motor without a guide mechanism. The airflow through the duct is slow, resulting in ineffective heat dissipation. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a wind turbine pitch system based on a high-power pitch motor, which solves the aforementioned problems of the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a wind turbine pitch system based on a high-power pitch motor, comprising:

[0007] A pitch motor, one end of which is fixed with a mounting plate for mounting on a wind turbine assembly;

[0008] A fan assembly is located at the other end of the pitch motor, and the fan and air guide on it work together to dissipate heat from the pitch motor.

[0009] The air duct is provided in two parts, which are symmetrically installed on the fan assembly. The air duct, together with the heat conduction mechanism on it, is used to quickly dissipate the heat generated by the pitch motor.

[0010] A dust cover is installed at the inlet of the fan assembly, and the dust cover, together with the filter screen thereon, is used to filter the outside air entering the fan assembly.

[0011] Preferably, the fan assembly includes a frame disposed at the other end of the pitch motor, and two fans arranged side by side are installed in the frame.

[0012] Preferably, the air guide includes an air guide plate disposed at the output port of the frame. The air guide plate is configured with a large-angle V-shaped structure and is attached to the other end of the pitch motor to guide the air drawn in by the two fans into the two air ducts.

[0013] Preferably, mounting plates are fixed on both sides of the air duct that contact the pitch motor. The mounting plates are fixed to the pitch motor by a plurality of equally spaced bolts to limit the air duct.

[0014] Preferably, the heat dissipation mechanism on the air duct includes a first heat dissipation component and a second heat dissipation component. The first heat dissipation component includes a first heat-conducting plate fixed on the inner wall of both sides of the air duct. The first heat-conducting plate is in contact with the housing of the pitch motor and is used to conduct heat out of the pitch motor. Multiple heat dissipation fins are installed at equal intervals on the first heat-conducting plate. Multiple strip-shaped slots are opened on the heat dissipation fins to cooperate with the air drawn in by the fan to quickly dissipate heat from the pitch motor.

[0015] Preferably, the second heat dissipation assembly includes multiple sets of heat dissipation components fixed on the inner wall of the middle section of the air duct. Each set of heat dissipation components consists of two fins arranged in a figure-eight shape. One end of each fin is fixed to the inner wall of the middle section of the air duct, and the other ends of the two fins are connected by a second heat-conducting plate. The second heat-conducting plate is in contact with the housing of the pitch motor. Multiple equally spaced heat dissipation holes are provided on the fins. The fins, together with the air drawn in by the fan, are used to further and rapidly dissipate heat from the pitch motor.

[0016] This invention provides a wind turbine pitch control system based on a high-power pitch motor. Compared with the prior art, it has the following advantages:

[0017] 1. The wind turbine pitch system based on a high-power pitch motor has heat conduction mechanisms such as a first heat dissipation component and a second heat dissipation component set in the air duct. The first heat conduction plate is attached to the pitch motor housing and connected by heat sinks and strip slots. The second heat conduction plate is combined with fins. This structure can effectively dissipate the heat inside the pitch motor and, together with the fan air, quickly dissipate heat. Compared with the existing method of relying solely on the air duct housing and a single fan to dissipate heat from the motor housing, this significantly improves the heat dissipation effect.

[0018] 2. The wind turbine pitch system based on a high-power pitch motor has two parallel fans with air guides. The air guides are in a large-angle V-shape, which can efficiently guide the air drawn in by the two fans into the two air ducts. Compared with the existing system that only has a single fan on the outside of one end of the motor and no air guide mechanism, this greatly improves the air velocity in the air duct and enhances the heat dissipation efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a side view of the overall structure of this utility model;

[0021] Figure 3 This is a schematic diagram showing the connection between the fan assembly and the air duct structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the air duct structure of this utility model;

[0023] Figure 5 This is a side view of the air duct structure of this utility model.

[0024] In the diagram: 1. Pitch motor, 11. Mounting plate, 2. Fan assembly, 21. Frame, 22. Fan, 23. Air guide plate, 3. Air duct, 31. Mounting plate, 32. First heat conduction plate, 33. Heat sink, 34. Fin, 35. Second heat conduction plate, 4. Dust cover, 41. Filter screen. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figure 1-5 As shown, this utility model provides two technical solutions:

[0027] The first implementation method is a wind turbine pitch system based on a high-power pitch motor, which includes a pitch motor 1, a fan 22 assembly 2, a duct 3, and a dust cover 4.

[0028] Specifically, one end of the pitch motor 1 is fixed with a mounting plate 11 for mounting on the fan assembly, and the fan 22 assembly 2 is located at the other end of the pitch motor 1. The fan 22 and the air guide on it work together to dissipate heat from the pitch motor 1. The fan 22 assembly 2 includes a frame 21 located at the other end of the pitch motor 1. Two fans 22 are installed side by side inside the frame 21. The air guide includes an air guide plate 23 located at the output port of the frame 21. The air guide plate 23 is set with a large-angle V-shaped structure and is attached to the other end of the pitch motor 1. It is used to guide the air drawn in by the two fans 22 into the two air ducts 3. The two fans 22, together with the air guide plate 23, can efficiently guide the outside air into the two air ducts 3, which increases the air velocity in the air ducts 3 and enhances the heat dissipation efficiency.

[0029] More specifically, there are two air ducts 3, which are symmetrically installed on the fan 22 assembly 2. The air ducts 3, together with the heat conduction mechanism on them, are used to quickly dissipate the heat generated by the pitch motor 1. Mounting plates 31 are fixed on both sides of the air duct 3 that contact the pitch motor 1. The mounting plates 31 are fixed to the pitch motor 1 by multiple equally spaced bolts to limit the position of the air duct 3. The mounting plates 31 can also be fixed by micro bolts at both ends. The whole assembly is magnetically attached to the pitch motor 1.

[0030] More specifically, the dust cover 4 is installed at the inlet of the fan 22 assembly 2. The dust cover 4, together with the filter plate 41 on it, is used to filter the outside air entering the fan 22 assembly 2. The dust cover 4 is connected to the frame 21 by magnetic attraction, which makes it easy to disassemble, clean and replace the filter plate 41 on it.

[0031] The second embodiment differs from the first embodiment in that the heat dissipation mechanism on the air duct 3 includes a first heat dissipation component and a second heat dissipation component. The first heat dissipation component includes a first heat-conducting plate 32 fixed to the inner walls on both sides of the air duct 3. The first heat-conducting plate 32 is in contact with the housing of the pitch motor 1 and is used to conduct heat out of the pitch motor 1. Multiple heat sinks 33 are installed at equal intervals on the first heat-conducting plate 32. Multiple strip-shaped slots are opened on the heat sinks 33 to cooperate with the air drawn in by the fan 22 to quickly dissipate heat from the pitch motor 1. The second heat dissipation component includes multiple sets of heat dissipation components fixed to the inner wall in the middle of the air duct 3. Each heat sink consists of two V-shaped fins 34 for easy airflow. One end of the fin 34 is fixed to the inner wall of the middle section of the air duct 3, and the other ends of the two fins 34 are connected by a second heat-conducting plate 35. The second heat-conducting plate 35 is attached to the housing of the pitch motor 1. Multiple equally spaced heat dissipation holes are provided on the fins 34. The fins 34 work with the air drawn in by the fan 22 to further and quickly dissipate heat from the pitch motor 1. The arrangement of multiple heat sinks 33 and multiple sets of fins 34 plays a role in turbulence, allowing the air to fully contact the heat sinks 33 and fins 34 and carry away the heat on them.

[0032] During installation, the two air ducts 3 are aligned with the pitch motor 1 via the frame 21. The two air ducts 3 are then inserted into the outer side of the pitch motor 1, and finally fixed to the pitch motor 1 with micro bolts. The installation is convenient. At this time, the first heat-conducting plate 32 and the second heat-conducting plate 35 inside the air duct 3 are in contact with the outer shell of the pitch motor 1, which plays a role in heat conduction. Then, the dust cover 4 is installed at the input port of the frame 21 by magnetic attraction. At this time, the installation of the device is completed. The fan 22 drive source of the device can be integrated into the input power supply of the pitch motor 1. When the device is working, the two fans 22 are first started. The fans 22 draw outside air into the frame 21. The air is guided into the air duct 3 through the heat-conducting plate inside the frame 21. The air comes into contact with the multiple heat sinks 33 and multiple sets of fins 34 inside the air duct 3, and finally the heat is carried out of the air duct 3, which plays a role in rapid heat dissipation of the pitch motor 1.

[0033] Furthermore, all content not described in detail in this specification is existing technology known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wind turbine pitch system based on a high-power pitch motor, characterized in that, include: A pitch motor, one end of which is fixed with a mounting plate for mounting on a wind turbine assembly; A fan assembly is provided at the other end of the pitch motor, and the fan and air guide on the fan assembly work together to dissipate heat from the pitch motor. The air duct is provided in two parts, which are symmetrically installed on the fan assembly. The air duct, together with the heat conduction mechanism on it, is used to quickly dissipate the heat generated by the pitch motor. A dust cover is installed at the inlet of the fan assembly, and the dust cover, together with the filter screen thereon, is used to filter the outside air entering the fan assembly.

2. The wind turbine pitch system based on a high-power pitch motor according to claim 1, characterized in that: The fan assembly includes a frame located at the other end of the pitch motor, and two fans arranged side by side are installed within the frame.

3. The wind turbine pitch system based on a high-power pitch motor according to claim 1, characterized in that: The air guide includes an air guide plate disposed at the output port of the frame. The air guide plate is configured with a large-angle V-shaped structure and is attached to the other end of the pitch motor to guide the air drawn in by the two fans into the two air ducts.

4. The wind turbine pitch system based on a high-power pitch motor according to claim 1, characterized in that: Mounting plates are fixed on both sides of the air duct that contact the pitch motor. The mounting plates are fixed to the pitch motor by multiple equally spaced bolts to limit the air duct.

5. A wind turbine pitch system based on a high-power pitch motor according to claim 1, characterized in that: The heat dissipation mechanism on the air duct includes a first heat dissipation component and a second heat dissipation component. The first heat dissipation component includes a first heat-conducting plate fixed on the inner wall of both sides of the air duct. The first heat-conducting plate is in contact with the housing of the pitch motor and is used to conduct heat out of the pitch motor. Multiple heat sinks are installed at equal intervals on the first heat-conducting plate. Multiple strip-shaped slots are opened on the heat sinks to cooperate with the air drawn in by the fan to quickly dissipate heat from the pitch motor.

6. A wind turbine pitch system based on a high-power pitch motor according to claim 5, characterized in that: The second heat dissipation assembly includes multiple sets of heat dissipation components fixed on the inner wall of the middle section of the air duct. Each set of heat dissipation components consists of two fins arranged in a figure-eight shape. One end of each fin is fixed to the inner wall of the middle section of the air duct, and the other ends of the two fins are connected by a second heat-conducting plate. The second heat-conducting plate is attached to the housing of the pitch motor. Multiple equally spaced heat dissipation holes are provided on the fins. The fins, together with the air drawn in by the fan, are used to further and rapidly dissipate heat from the pitch motor.

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