Pitch motor with leak-proof function

Abstract

To provide a pitch motor with a leak-proof function, which significantly extends the service life and reduces maintenance costs. [Solution] A pitch motor with a leak-proof function comprises a drive assembly including a pitch motor (101) and an end cover (102) connected to one end of the pitch motor, and a gearbox assembly including a gearbox (201) and a fixed cover (202) connected to one end of the gearbox, with the end cover located between the pitch motor and the gearbox, wherein the pitch motor drives the rotation of the gearbox, the end cover connects the pitch motor and the gearbox, and the end cover can prevent lubricating oil leaked from the gearbox from flowing into the pitch motor, and further blocks external water vapor and ash dust from entering the pitch motor.

Description

[Technical field]

[0001] The present invention relates to the field of pitch motors, and in particular to pitch motors with leak-proof function. [Background technology]

[0002] In the pitch system of conventional wind turbines, due to a defect in the initial design of the reduction gear, lubricating oil continues to seep out while the hub of the wind turbine is rotating. Since the pitch motor does not take into account the oil leakage caused by the usage environment in the wind power plant, no sealing protection devices are added. As a result, the lubricating oil etc. penetrates into the internal cavity of the motor, destroying the insulation of the motor and shortening the service life of the motor. After a long time, it even penetrates into the commutator, which is rich in toner and conductive, resulting in a local short circuit in the motor, generating heat, and in serious cases, even burning out the motor. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of the embodiments of the present invention and briefly describe some preferred embodiments. This section, the abstract of the application, and the title of the utility model may be abbreviated or omitted so as not to obscure the purpose of this section, the abstract, and the title of the utility model, and such abbreviations or omissions are not intended to limit the scope of the present invention.

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] The technical problem that this invention aims to solve is that lubricating oil from the reducer leaks into the motor while the motor is operating.The solution is to machine a cavity in the front end cover of the motor into which a seal ring can be placed, and attach a skeletal seal ring to the tip of the bearing, thereby preventing lubricating oil from entering the motor cavity and protecting the motor coil from damage caused by the lubricating oil.

[0006] In order to solve the above technical problems, the present invention provides the following technical solution: A pitch motor with a leak-proof function, which includes a drive assembly including a pitch motor and an end cover connected to one end of the pitch motor; a gearbox assembly including a gearbox and a fixed cover connected to one end of the gearbox, with an end cover located between the pitch motor and the gearbox.

[0007] In one preferred embodiment of the pitch motor with the leak-proof function described in the present invention, the pitch motor is provided with a receiving cavity, and the motor shaft extends from one end of the pitch motor into the receiving cavity.

[0008] In one preferred embodiment of the pitch motor with the leak-proof function described in the present invention, the end cover is provided with a first annular wall on an end surface facing the pitch motor, and a second annular wall on an end surface facing the gearbox.

[0009] In a preferred embodiment of the pitch motor with leak-proof function described in the present invention, the inner wall of the first annular wall is provided with a first screw thread, and the second annular wall is provided with a second screw thread.

[0010] In a preferred embodiment of the pitch motor with the leakage prevention function described in the present invention, the end cover is provided with an oil seal groove, an oil seal ring, and a round hole, the round hole is located at the center of the end cover, the oil seal groove is coaxial with the round hole and has a radius larger than the radius of the round hole, and the oil seal ring is installed in the oil seal cavity.

[0011] In one preferred embodiment of the pitch motor with the leak-proof function described in the present invention, a first screw groove is provided at one end of the pitch motor, and the first screw thread and the first screw groove are engaged with each other to connect the pitch motor and the end cover.

[0012] In a preferred embodiment of the pitch motor with the leak-proof function described in the present invention, the fixed cover is provided with a second screw groove, and the second screw groove and the second screw thread are engaged with each other to connect the end cover and the fixed cover.

[0013] In one preferred embodiment of the pitch motor having a leak-proof function according to the present invention, an annular bump is further provided on an end surface of the end cover facing the gear box.

[0014] In a preferred embodiment of the pitch motor with leak-proof function described in the present invention, the fixed cover is provided with an annular groove, and the annular bump is fitted into the annular groove.

[0015] In one preferred embodiment of the pitch motor with the leak-proof function described in the present invention, the fixed cover is provided with an axial groove, which is recessed inward from the end face of the fixed cover to the inside of the gearbox, and the motor shaft is fitted into the axial groove through a round hole.

[0016] The beneficial effects of the present invention are as follows: the high sealing performance can prevent events such as motor burnout caused by oil contamination entering the pitch motor, and in the field of wind power generation, this novel sealing technology can greatly improve the resistance of the pitch motor and its adaptability to the application environment, and also extend the service life of the pitch motor. [Brief description of the drawings]

[0017] In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings used in the description of the embodiments. Of course, the drawings described below are only a part of the embodiments of the present invention, and those skilled in the art can think of other drawings based on these drawings without any creative efforts. [Figure 1] FIG. 2 is an overall view of the drive assembly and gearbox assembly in the first embodiment. [Diagram 2]FIG. 4 is an enlarged view of an end cover in the first embodiment. [Diagram 3] 13 is a front and back view of an end cover according to the second embodiment. FIG. [Figure 4] FIG. 11 is a configuration diagram of a gear box according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] In order to make the above objectives, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below with reference to the drawings in the specification.

[0019] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention; however, the present invention may be embodied in other forms different from those described herein, and those skilled in the art will be able to similarly disseminate the present invention without violating the spirit and scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

[0020] As used herein, the term "one embodiment" or "embodiment" refers to a particular feature, structure, or characteristic that may be included in at least one implementation of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they mutually exclusive with other embodiments, either alone or in the alternative.

[0021] Example 1 1, which is a first embodiment of the present invention, the embodiment provides a pitch motor with a leak-proof function. The pitch motor with the leak-proof function includes a drive assembly 100 and a gearbox assembly 200, the drive assembly 100 and the gearbox assembly 200 are pitch units of one blade of a wind power generator, the drive assembly 100 is used to provide power, and the gearbox assembly 200 is used to control the rotation speed of the blade, the drive assembly 100 includes a pitch motor 101 with a cylindrical structure and an end cover 102, the end cover 102 has a circular shape and is fixed to one end surface of the pitch motor 101 and matches the end surface, and the end cover 102 is provided between the pitch motor 101 and the gearbox assembly 200 and is used to connect them, the end cover 102 adopts a spiral fixing structure, which is convenient for subsequent installation, removal, and replacement, and facilitates maintenance; The gearbox assembly 200 includes a gearbox 201 and a fixed cover 202. The end cover 102 is disposed between the pitch motor 101 and the gearbox 201. The fixed cover 202 is attached to the end of the gearbox 201 facing the end cover 102. The gearbox 201 is operated by the power transmitted by the pitch motor 101. The gearbox 201 has a speed increasing / decreasing function and mainly plays a role of controlling the rotation speed of the blades. The fixed cover 202 is connected to the end cover 102 and is used to stabilize the connection between the drive assembly 100 and the gearbox assembly 200. During the operation of the gearbox 201, the problem of lubricating oil leakage has not been considered in the previous stage, so that the lubricating oil in the box will permeate into the pitch motor 101 from the joint surface between the pitch motor 101 and the gearbox 201, destroying the insulating parts in the pitch motor 101. After a long time, it will further corrode the circuit and damage the motor, which is a very high potential safety hazard.

[0022] Example 2 1 and 2, which is a first embodiment of the present invention, the embodiment provides a pitch motor with a leakage prevention function, the pitch motor 101 is provided with a receiving cavity 101a, the receiving cavity 101a is provided in the pitch motor 101, the motor shaft 101b extends from the end of the pitch motor 101 facing the end cover 102 into the receiving cavity 101a, when the pitch motor is operated, the motor shaft 101b rotates and drives the rotation of the gear in the gear box 201, and then drives the rotation of the blades, the motor shaft 101b is the most important structure connecting the pitch motor 101 and the gear box 201, and is also the main leakage path of the lubricating oil, before it was improved, the space around the motor shaft 101b is large, and the lubricating oil is easily flowing from the motor shaft 101b into the pitch motor 101, so that the insulating device and the circuit board in the receiving cavity 101a are easily eroded by the lubricating oil, resulting in the motor failure.

[0023] Furthermore, the end cover 102 is provided with a first annular wall 102a on an end surface facing the pitch motor 101, and a second annular wall 102b on an end surface facing the gear box 201, and the first annular wall 102a and the second annular wall 102b surround the edge of the end cover 102. The inner wall of the first annular wall 102a is provided with a first screw thread 102a-1, and the inner wall of the second annular wall 102b is provided with a second screw thread 102b-1. The screw structure can facilitate removal and replacement in the later stage, and facilitate the maintenance of the device. The main role of the first annular wall 102a and the second annular wall 102b is to cover the exposed part of the connection between the pitch motor 101 and the gear box 201. Such a structure can better protect the motor from erosion caused by contamination of the external environment, such as water vapor, ash dust, etc., and help to further extend the service life of the motor.

[0024] Next, the end cover 102 is provided with an oil seal groove 102c, an oil seal ring 102d, and a round hole 102e. The round hole 102e is located at the center of the end cover 102. The oil seal groove 102c is coaxial with the round hole 102e and has a radius larger than the radius of the round hole 102e. The oil seal ring 102d is attached in the oil seal groove 102c. The outer ring of the oil seal ring 102d is bonded to the outer ring of the round hole 102e. The inner ring of the oil seal ring 102d is attached to the motor shaft. During operation of the device, the lubricating oil flowing out of the gear box 201 flows onto the motor shaft 101b, and when it flows through the motor shaft 101b to the position of the round hole 102e of the end cover 102, it is blocked by the oil seal ring 102d and cannot flow into the pitch motor 101, thereby effectively preventing the problem of breakdown and damage to the pitch motor 101 caused by the erosion of the lubricating oil, greatly extending the service life of the pitch motor 101, and reducing maintenance costs.

[0025] Here, a first screw groove 101c is provided at one end of the pitch motor 101, and the pitch motor 101 and the gear box 201 are connected by the first screw thread 102a-1 and the first screw groove 101c being fitted together. The fixed cover 202 is provided with a second screw groove 202a, and the second screw groove 202a and the second screw thread 102b-1 are engaged with each other to connect the end cover 102 and the fixed cover 202. The first screw thread 102a-1 and the second screw thread 102b-1 are located on the inner walls of the annular walls on both sides of the end cover 102, respectively. When the screw thread and the screw groove are engaged in pairs, the annular walls are engaged with the pitch motor 101 and the end cover 102, respectively. Such a structure in which both sides abut can not only facilitate the connection and removal of the pitch motor 101 and the gearbox 201, but also effectively prevent the infiltration of external ash and water vapor, thereby further protecting the internal structure of the pitch motor 101 and further extending the service life of the pitch motor 101.

[0026] Example 3 3 and 4, which shows a second embodiment of the present invention. This embodiment is based on the previous embodiment, in which an annular bump 102f is further provided on the end surface of the end cover 102 facing the gear box 201, and an annular groove 202b is provided on the fixed cover 202. When the device is in working state, the annular bump 102f is fitted into the annular groove 202b. Such a concave-convex structure of the end cover 102 can improve the sealing performance of the joint surface and further ensure the rationality and practicality of the entire structure.

[0027] Finally, the fixed cover 202 is provided with an axial groove 202c, which is recessed inward from the end face of the fixed cover 202 into the gearbox 201, the motor shaft 101b is fitted into the axial groove 202c through the round hole 102e, the pitch motor 101 provides power to the motor shaft 101b, a gear is provided in the portion of the axial groove 202c that extends into the gearbox 201, the motor shaft 101b is inserted into the axial groove 202c, and the gear is directly fitted into the motor shaft 101b, and the gearbox 201 is operated by the power provided from the motor shaft 101b.

[0028] It is important to note that the structures and arrangements of the present application as shown in the different exemplary embodiments are merely exemplary. Although the disclosure herein details only a few embodiments, as the reader of this disclosure can readily appreciate, many modifications (e.g., changes in the dimensions, scales, structures, shapes and proportions of the various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) are possible, given the novel teachings and advantages that do not substantially depart from the subject matter described in the application. For example, an element shown as being integral may be composed of multiple parts or elements, the location of an element may be inverted or otherwise altered, and the nature or number or location of discrete elements may be changed or modified. Thus, all such modifications are intended to be within the scope of the present invention. The order or sequence of any process or method steps may be altered or reordered based on alternative embodiments. In the claims, any clause relating to "apparatus with a function" is intended to include structures performing said functions described herein, not just structurally equivalent, but also equivalent structures. The design, operation and arrangement of the exemplary embodiments may be subject to other substitutions, modifications, changes and omissions without departing from the scope of the present invention. Therefore, the present invention is not limited to a specific embodiment, but can be extended to various modifications within the scope of the appended claims.

[0029] Also, in order to concisely describe the example embodiments, it is not necessary to describe all of the features of an actual embodiment (i.e., those features that are not relevant to the best mode of carrying out the invention currently contemplated, or those features that are not relevant to the implementation of the invention).

[0030] As can be appreciated, many specific embodiment decisions may be made during the development of any practical embodiment, e.g., at any step or design stage. While such a development effort may be cumbersome and time-consuming, for those of ordinary skill in the art having the benefit of this disclosure, such an development effort will nevertheless be a routine undertaking of design, fabrication, and production that does not require undue experimentation.

[0031] It should be noted that the above embodiments are only for illustrating the technical solutions of the present invention, rather than for limiting the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art can understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope thereof, all of which shall be included in the scope of the registered claims of this utility model.

Claims

1. A drive assembly (100) including a pitch motor (101) and an end cover (102) connected to one end of the pitch motor (101); A gearbox assembly (200) including a gearbox (201) and a fixed cover (202) connected to one end of the gearbox (201), with an end cover (102) located between the pitch motor (101) and the gearbox (201).

2. 2. The pitch motor with a leak-proof function as described in claim 1, characterized in that the pitch motor (101) is provided with a receiving cavity (101a) and the motor shaft (101b) extends from one end of the pitch motor (101) into the receiving cavity (101a).

3. 3. The pitch motor with a leak-proof function according to claim 2, characterized in that the end cover (102) is provided with a first annular wall (102a) at an end surface facing the pitch motor (101) and a second annular wall (102b) at an end surface facing the gear box (201).

4. 4. The pitch motor with leakage prevention function according to claim 3, characterized in that the inner wall of the first annular wall (102a) is provided with a first thread (102a-1) and the inner wall of the second annular wall (102b) is provided with a second thread (102b-1).

5. 4. The pitch motor with leakage prevention function according to claim 3, characterized in that the end cover (102) is provided with an oil seal groove (102c), an oil seal ring (102d) and a round hole (102e), the round hole (102e) is located at the center of the end cover (102), the oil seal groove (102c) is coaxial with the round hole (102e) and has a radius larger than the radius of the round hole (102e), and the oil seal ring (102d) is installed in the oil seal cavity (102c).

6. The pitch motor with a leak-proof function according to claim 2, characterized in that a first screw groove (101c) is provided at one end of the pitch motor (101), and a first screw thread (102a-1) and the first screw groove (101c) are engaged with each other to connect the pitch motor (101) and the end cover (102).

7. The pitch motor with a leak-proof function described in claim 6, characterized in that the fixed cover (202) is provided with a second screw groove (202a), and the second screw groove (202a) and the second screw thread (102b-1) are engaged with each other to connect the end cover (102) and the fixed cover (202).

8. The pitch motor with a leakage prevention function according to claim 5, characterized in that an annular bump (102f) is further provided on an end surface of the end cover (102) facing the gear box (201).

9. The pitch motor with a leak-proof function as described in claim 7, characterized in that the fixed cover (202) is provided with an annular groove (202b), and the annular bump (102f) is fitted into the annular groove (202b).

10. The pitch motor with leak-proof function according to claim 9, characterized in that the fixed cover (202) is provided with an axial groove (202c), the axial groove (202c) is recessed inward from the end face of the fixed cover (202) to the inside of the gearbox (201), and the motor shaft (101b) is fitted into the axial groove (202c) through a round hole (102e).

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