Variable-pitch slip ring mounting structure suitable for small wind generating set

Abstract

The utility model discloses a variable pitch slip ring mounting structure suitable for a small wind generating set, which comprises a variable pitch slip ring, a slip ring hollow shaft, a slip ring mounting flange, a hollow shaft bearing, a slip ring mounting seat, a mounting bracket, a rotating speed transmission shaft, a coupler and a rotating speed encoder, the front end of the slip ring hollow shaft is fixed on the variable-pitch electrical cabinet through a slip ring mounting flange, the rear end part of the slip ring hollow shaft is embedded into the front end of the slip ring mounting seat and is fixedly connected with the slip ring mounting seat, and the rear end of the slip ring hollow shaft is supported on the mounting bracket through a hollow shaft bearing; the variable-pitch slip ring is embedded into the rear end of the slip ring mounting seat and fixedly connected with the slip ring mounting seat, the rotating speed transmission shaft is mounted in a slip ring center hole of the variable-pitch slip ring, the front end of the rotating speed transmission shaft is connected with the slip ring mounting seat, and the rear end of the rotating speed transmission shaft penetrates through a rear end plate of the mounting support and is connected with the rotating speed encoder through a coupler. According to the utility model, the problem of mounting the variable-pitch slip ring of the small direct-driven wind generating set can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, in particular to a pitch slip ring installation structure applicable to a small wind turbine generator set. Background Art

[0002] Conventional small wind turbine generator sets adopt a fixed pitch design or a centrifugal or mechanical push rod pitch change design, and do not require power supply through a pitch slip ring. For small wind turbine generator sets with a pitch variable speed design for the wind wheel, an electric pitch system needs to be equipped, and power supply and communication between the main engine and the pitch system need to be carried out through a pitch slip ring. Since the slip rings of the electric pitch systems of existing medium and large wind turbine generator sets are large in size and complex in structure and are not applicable to small wind turbine generator sets, it is urgent to design a pitch slip ring installation structure applicable to a direct drive variable speed pitch small wind turbine generator set. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a pitch slip ring installation structure applicable to a small wind turbine generator set, which can effectively solve the installation problem of the pitch slip ring of a small direct drive wind turbine generator set.

[0004] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0005] A pitch slip ring installation structure applicable to a small wind turbine generator set, the wind turbine generator set includes a hub, a generator, a pitch electrical cabinet and a main frame. The hub and the outer shell of the generator are integrally designed. The pitch electrical cabinet is installed at the front end of the hub and is supported on the stator main shaft of the generator by two angular contact ball bearings. The rear end of the stator main shaft is connected to the main frame. The pitch slip ring installation structure includes a pitch slip ring, a slip ring hollow shaft, a slip ring mounting flange, a hollow shaft bearing, a slip ring mounting seat, a mounting bracket, a rotational speed transmission shaft, a coupling, a rotational speed encoder and an encoder bracket. The slip ring hollow shaft is arranged in the central hole of the stator main shaft. Its front end is fixed to the pitch electrical cabinet through the slip ring mounting flange. The rear end of it is inserted into the front end interior of the slip ring mounting seat and fixedly connected to the slip ring mounting seat. And the rear end of the slip ring hollow shaft is supported on the mounting bracket through the hollow shaft bearing. The mounting bracket is fixed on the main frame. The pitch slip ring is inserted into the rear end interior of the slip ring mounting seat and fixedly connected to the slip ring mounting seat. A slip ring central hole for installing the rotational speed transmission shaft is formed at the center of the pitch slip ring. The rotational speed transmission shaft is installed in the slip ring central hole. Its front end is connected to the slip ring mounting seat. Its rear end passes through the rear end plate of the mounting bracket and is connected to the rotational speed encoder through the coupling. The rotational speed encoder is fixed to the rear end plate of the mounting bracket through the encoder bracket.

[0006] Further, it also includes a rotational speed code disk and a rotational speed proximity switch. The rotational speed code disk is arranged inside the mounting bracket and fixed to the rear end of the slip ring mounting seat, and the rotational speed proximity switch is mounted on the rear end plate of the mounting bracket.

[0007] Further, a slip ring rotation stop bolt is provided on the rear end plate of the mounting bracket, and a notch matching the slip ring rotation stop bolt is provided on the rear flange of the pitch slip ring. By inserting the slip ring rotation stop bolt into the notch, the rotation stop of the pitch slip ring is achieved.

[0008] Further, the hollow shaft of the slip ring is made of a hollow steel pipe, and an inner hole for the cable to pass through is formed at its center. The cable of the pitch electrical cabinet is connected to the pitch slip ring through the inner hole of the hollow shaft of the slip ring.

[0009] Further, the inner ring of the hollow shaft bearing is connected with the hollow shaft of the slip ring by interference fit, and a square flange is provided on its outer ring. The square flange is connected to the mounting bracket by bolts.

[0010] Further, the mounting bracket includes a bracket main body and a rear end plate fixed to the rear end of the bracket main body.

[0011] Further, the hollow shaft of the slip ring and the slip ring mounting flange are of a split structure.

[0012] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0013] 1. The utility model adopts a general industrial slip ring, which does not require customized development. The slip ring is installed through structures such as a slip ring mounting seat, and the structure is simple and the cost is low.

[0014] 2. The utility model supports the entire pitch slip ring installation structure through a hollow shaft bearing, and the external load is borne by the hollow shaft bearing, so that the internal bearing of the pitch slip ring does not bear the external load, significantly improving the reliability of the pitch slip ring.

[0015] 3. The slip ring mounting flange and the hollow shaft of the slip ring of the utility model are of a split structure. The slip ring mounting flange can move along the axis direction of the hollow shaft of the slip ring during installation, facilitating the installation and adjustment of the entire installation structure and making the installation more convenient.

[0016] 4. The utility model realizes redundant rotational speed measurement by setting a rotational speed code disk and a rotational speed proximity switch, ensuring that the unit can still be protected against overspeed in case of the failure of the rotational speed encoder and guaranteeing the safety of the unit. Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of the pitch slip ring installation structure of the utility model.

[0018] Figure 2This is a partial cross-sectional view of the pitch slip ring installation structure of the present utility model.

[0019] Figure 3 This is an assembly schematic diagram of the pitch slip ring installation structure of the present utility model.

[0020] Figure 4 This is an exploded view of the pitch slip ring installation structure of the present utility model. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment:

[0023] As Figures 1 to 4 shown, this embodiment provides a pitch slip ring installation structure applicable to a small wind turbine generator set. The wind turbine generator set includes a hub 2, a generator 3, a pitch electrical cabinet 4 and a main frame 5. The hub 2 and the housing of the generator 3 are integrally designed. The pitch electrical cabinet 4 is installed at the front end of the hub 2 and is supported on the stator main shaft 301 of the generator 3 by two angular contact ball bearings. The rear end of the stator main shaft is connected to the main frame 5, and the main frame 5 is connected to the tower through a yaw system.

[0024] The pitch slip ring mounting structure includes a pitch slip ring 101, a slip ring hollow shaft 102, a slip ring mounting flange 103, a hollow shaft bearing 104, a slip ring mounting seat 105, a mounting bracket 106, a rotational speed transmission shaft 107, a coupling 108, a rotational speed encoder 109, and an encoder bracket 110. The slip ring hollow shaft 102 is inserted into the central hole of the stator main shaft. Its front end is fixed to the pitch electrical cabinet 4 through the slip ring mounting flange 103 and rotates together with the pitch electrical cabinet 4 and the hub 2. The rear end of it is inserted into the front end interior of the slip ring mounting seat 105 and fixedly connected to the slip ring mounting seat 105. And the rear end of the slip ring hollow shaft 102 is supported on the mounting bracket 106 through the hollow shaft bearing 104. The mounting bracket 106 includes a bracket main body 1061 and a rear end plate 1062 bolted to the rear end of the bracket main body 1061. The bracket main body 1061 is fixed to the main frame 5. The pitch slip ring 101 is inserted into the rear end interior of the slip ring mounting seat 105 and fixedly connected to the slip ring mounting seat 105. The slip ring mounting seat 105 fixes and supports the pitch slip ring 101. A slip ring central hole for installing the rotational speed transmission shaft 107 is formed at the center of the pitch slip ring 101. The rotational speed transmission shaft 107 is installed in the slip ring central hole. Its front end is connected to the slip ring mounting seat 105. Its rear end passes through the rear end plate 1062 of the mounting bracket 106 and is connected to the rotational speed encoder 109 through the coupling 108. The coupling 108 can compensate for the deformation error of the transmission shaft and avoid damaging the rotational speed encoder 109. The rotational speed encoder 109 is fixed to the rear end plate 1062 of the mounting bracket 106 through the encoder bracket 110. The rotational speed measurement is realized through the rotational speed encoder 109.

[0025] Meanwhile, for the convenience of the centering installation of the rotational speed encoder 109, the bolt holes during the installation of the encoder bracket 110 and the rear end plate 1062 of the mounting bracket 106 can adopt a long hole design.

[0026] This embodiment further includes a rotational speed code disc 111 and a rotational speed proximity switch (not shown in the figure). The rotational speed code disc 111 is arranged inside the bracket main body 1061 and bolted to the rear end of the slip ring mounting seat 105. The rotational speed proximity switch is installed on the rear end plate 1062. The rotational speed proximity switch and the rotational speed code disc 111 cooperate to perform redundant rotational speed measurement, ensuring that the unit can still be protected against overspeed in case of the failure of the rotational speed encoder 109 and guaranteeing the safety of the unit.

[0027] A slip ring anti-rotation bolt 112 is arranged on the rear end plate 1062 of the mounting bracket 106. A notch 1011 matching the slip ring anti-rotation bolt 112 is arranged on the rear flange of the pitch slip ring 101. By inserting the slip ring anti-rotation bolt 112 into the notch, the anti-rotation of the pitch slip ring 101 is realized.

[0028] In this embodiment, the hollow shaft 102 of the slip ring is made of a hollow steel pipe, and an inner hole for the cable to pass through is formed at its center. The cable of the pitch electrical cabinet 4 is connected to the pitch slip ring 101 through the inner hole of the hollow shaft 102 of the slip ring, and then connected to the main electrical cabinet through the pitch slip ring 101.

[0029] The inner ring of the hollow shaft bearing 104 is connected to the hollow shaft 102 of the slip ring by interference fit. A square flange 1041 is provided on its outer ring, and the square flange is connected to the mounting bracket 106 by bolts, and cooperates with the slip ring mounting seat 105 to support the pitch slip ring 101.

[0030] To facilitate the adjustment of the entire installation structure, the hollow shaft 102 of the slip ring and the slip ring mounting flange 103 are designed as a split structure. When the slip ring mounting flange 103 is sleeved on the hollow shaft 102 of the slip ring, it can move along the axial direction, making the installation more convenient.

[0031] The above is only a preferred embodiment of the utility model patent, but the protection scope of the utility model patent is not limited thereto. Any person skilled in the art within the scope disclosed by the utility model patent, according to the technical solution of the utility model patent and the inventive concept of the utility model patent, makes equivalent substitutions or changes, all belong to the protection scope of the utility model patent.

Claims

1. A pitch slip ring installation structure applicable to a small wind turbine generator set. The wind turbine generator set includes a hub, a generator, a pitch electrical cabinet and a main frame. The hub and the outer shell of the generator are integrally designed. The pitch electrical cabinet is installed at the front end of the hub and is supported on the stator main shaft of the generator by two angular contact ball bearings. The rear end of the stator main shaft is connected to the main frame. It is characterized in that: The pitch slip ring mounting structure includes a pitch slip ring, a slip ring hollow shaft, a slip ring mounting flange, a hollow shaft bearing, a slip ring mounting seat, a mounting bracket, a rotational speed transmission shaft, a coupling, a rotational speed encoder, and an encoder bracket. The slip ring hollow shaft is disposed in the central hole of the stator main shaft. Its front end is fixed to the pitch electrical cabinet through the slip ring mounting flange. Its rear end is inserted into the front end interior of the slip ring mounting seat and fixedly connected to the slip ring mounting seat. And the rear end of the slip ring hollow shaft is supported on the mounting bracket through the hollow shaft bearing. The mounting bracket is fixed on the main frame. The pitch slip ring is inserted into the rear end interior of the slip ring mounting seat and fixedly connected to the slip ring mounting seat. A slip ring central hole for installing the rotational speed transmission shaft is formed at the center of the pitch slip ring. The rotational speed transmission shaft is installed in the slip ring central hole. Its front end is connected to the slip ring mounting seat. Its rear end passes through the rear end plate of the mounting bracket and is connected to the rotational speed encoder through the coupling. The rotational speed encoder is fixed on the rear end plate of the mounting bracket through the encoder bracket.

2. The pitch slip ring mounting structure applicable to a small wind turbine generator set according to claim 1, wherein: It further includes a rotational speed code disk and a rotational speed proximity switch. The rotational speed code disk is disposed inside the mounting bracket and fixed to the rear end of the slip ring mounting seat. The rotational speed proximity switch is installed on the rear end plate of the mounting bracket.

3. The pitch slip ring mounting structure applicable to a small wind turbine generator set according to claim 1, characterized in that: A slip ring anti-rotation bolt is provided on the rear end plate of the mounting bracket. A notch matching the slip ring anti-rotation bolt is provided on the rear flange of the pitch slip ring. By engaging the slip ring anti-rotation bolt into the notch, anti-rotation of the pitch slip ring is achieved.

4. The pitch slip ring mounting structure applicable to small wind turbines according to claim 1, characterized in that: The slip ring hollow shaft is made of a hollow steel pipe. An inner hole for the cable to pass through is formed at its center. The cable of the pitch electrical cabinet is connected to the pitch slip ring via the inner hole of the slip ring hollow shaft.

5. The pitch slip ring mounting structure applicable to small wind turbines according to claim 1, characterized in that: The inner ring of the hollow shaft bearing is connected with the slip ring hollow shaft in an interference fit. A square flange is provided on its outer ring. The square flange is connected to the mounting bracket through bolts.

6. The pitch slip ring mounting structure applicable to a small wind turbine generator set according to claim 1, wherein: The mounting bracket includes a bracket main body and a rear end plate fixed to the rear end of the bracket main body.

7. The pitch slip ring mounting structure applicable to small wind turbines according to claim 1, characterized in that: The slip ring hollow shaft and the slip ring mounting flange are of a split structure.

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