CN218828331U - Slip ring device, generator and wind generating set - Google Patents

Abstract

The application provides a sliding ring device, a generator and a wind generating set. The slip ring device comprises a brush holder which is concentric with the slip ring, an electric brush which is in sliding contact with the slip ring is fixed on the brush holder, a plurality of conducting plate assemblies which are axially arranged at intervals are arranged on the brush holder, the conducting plate assemblies are electrically connected with the electric brush, each conducting plate assembly comprises a first conducting part and a second conducting part, and the first conducting parts and the second conducting parts are circumferentially connected to form a closed ring. This application is through changing first conductive part and second conductive part into the closed ring by traditional semicircle board, can improve carbon brush current return circuit, therefore can improve the uneven condition of flowing of carbon brush current on the one hand, prolongs the life of brush, and then can prolong the life of sliding ring device and the life of the generator that has this sliding ring device.

Description

Slip ring device, generator and wind generating set

Technical Field

The application relates to the technical field of slip ring devices, in particular to a slip ring device, a generator and a wind generating set.

Background

At present, in the structural design of the doubly-fed wind generator, the conducting plates on the slip ring devices used in the market are all semicircular rings.

In a large megawatt double-fed wind driven generator, when the rotor current is large, because the number of the carbon brushes on the slip ring device is large, when the current conducting plate is a semicircular ring, the phenomenon that the current flowing through the carbon brushes at different positions has a large difference easily occurs. The carbon brush with large current generates heat seriously, the abrasion of the carbon brush can be increased by abnormal high temperature to influence the service life of the carbon brush and further influence the service life of the double-fed generator, and when the heat generation exceeds a certain temperature, the carbon brush can be in normal contact with the slip ring due to clamping stagnation of thermal expansion, so that the double-fed generator can not work normally.

In order to make the current flowing through the carbon brushes as average as possible, and thus to improve the lifetime of the doubly fed generator, it is necessary to develop a new slip ring arrangement.

SUMMERY OF THE UTILITY MODEL

The purpose of the present application is to solve the problem of how to make the current flowing through the carbon brush as average as possible. In view of the above, embodiments of the present application are directed to providing a slip ring device, a generator and a wind turbine generator system, wherein the slip ring device enables average values of currents on each carbon brush to be relatively close, so as to improve the service life of the generator using the slip ring device.

In order to solve the above problem, in a first aspect, the present application provides a slip ring device, including a brush holder concentrically disposed with a slip ring, a brush fixed on the brush holder and in sliding contact with the slip ring, a plurality of conducting plate assemblies axially spaced apart on the brush holder, the conducting plate assemblies electrically connected to the brush, the conducting plate assemblies including a first conducting portion and a second conducting portion, the first conducting portion and the second conducting portion being circumferentially connected to form a closed ring.

In yet another possible embodiment, the brushes are carbon brushes.

In a further possible embodiment, a plurality of circumferentially spaced brushes are connected to each conducting plate assembly, a hold-down spring is fixed to the brush holder, one end of each brush facing away from the slip ring is fixedly connected to the hold-down spring, and the brushes are located above a first central plane, wherein the first central plane extends in a horizontal direction, and an axis of the slip ring is located in the first central plane. In yet another possible embodiment, the first conductive portion and the second conductive portion are a unitary structure.

In yet another possible embodiment, each conductive plate assembly is provided with at least one outlet connection structure for connecting an output conductor to conduct current through the conductive plate assembly.

In yet another possible embodiment, the outlet connection is provided at a lower portion of the conducting plate assembly, and the outlet connection has an angle of no more than 60 ° with a line connecting the center of the conducting plate assembly and a second central plane, wherein the second central plane is perpendicular to the first central plane and the axis of the slip ring is located in the second central plane. In yet another possible embodiment, the conductive plate assembly includes a ring body defined by the first conductive portion and the second conductive portion, and an engaging lug extending radially from an edge of the ring body, the outlet connection structure being disposed on the engaging lug.

In a further possible embodiment, the second conductive part comprises a flow-guiding cable, both ends of which are connected to both ends of the first conductive part in the circumferential direction.

In a second aspect of the present application, a generator is disclosed, which comprises the slip ring device described above.

The third aspect of the application discloses a wind generating set, the above-mentioned generator of the wind generating set.

This application is through changing first conductive part and second conductive part into the closed ring by traditional semicircle board, can improve carbon brush current return circuit, therefore can improve the uneven condition of flowing of carbon brush current on the one hand, prolongs the life of brush, and then can prolong the life of sliding ring device and the life of the generator that has this sliding ring device.

Drawings

Fig. 1 is a schematic structural diagram of a slip ring device according to an embodiment of the present disclosure.

Fig. 2 is a front view of the slip ring device of fig. 1.

Fig. 3 is a top view of the slip ring assembly of fig. 2.

Fig. 4 is a left side view of the slip ring assembly of fig. 2.

Fig. 5 is a schematic structural diagram of another slip ring device according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of another slip ring device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

For a more convenient understanding of the present application, reference is now made to the following descriptions taken in conjunction with the accompanying drawings.

In a first aspect, referring to fig. 1 to 6, the present application provides a slip ring device, the slip ring device includes a brush holder 2 disposed concentrically with a slip ring 1, a brush 22 fixed on the brush holder 2 and in sliding contact with the slip ring 1, the slip ring device further includes a central hole 3, the slip ring 1, the brush holder 2 and the central hole 3 are disposed concentrically, the brush holder 2 has a plurality of conductive plate assemblies 21 disposed axially at intervals, the conductive plate assemblies 21 are electrically connected to the brush 22, the conductive plate assemblies 21 include a first conductive portion 211 and a second conductive portion 212, and the first conductive portion 211 and the second conductive portion 212 are circumferentially connected to form a closed ring. This application is through changing first conductive part and second conductive part into the closed ring by traditional semicircle board, can improve carbon brush electric current return circuit, therefore can improve the uneven circumstances of flowing of carbon brush electric current from this one side, prolongs the life of brush, and then can prolong the life of sliding ring device and the life of the generator that uses this sliding ring device.

In this embodiment, the brush holder 2 may further include a connection plate 23 arranged in parallel with the conductive plate assembly 21, the connection plate 23 being arranged at one end of the brush holder 2. The slip ring 1 is provided with 3 sets of conductive posts 11, each set of conductive posts 11 corresponds to one conductive plate assembly 21, and each pair of conductive posts 11 corresponds to one phase of the three-phase power.

The brush holder 2 further comprises a connecting post 24 for fixedly connecting the conductive plate assembly 21 and the connecting plate 23 together. In the embodiment shown in fig. 1-6, there are three connecting posts 24 in one slip ring assembly.

In yet another embodiment, the brushes 22 are carbon brushes. Since the brush 22 and the slip ring 1 are in sliding contact, friction between the two may cause one or both of them to be seriously worn, and since carbon has good heat conduction and lubrication properties, the brush 22 employs a carbon brush in order to reduce maintenance cost of the slip ring 1. The carbon is abraded and the metal is not required to be maintained, so that the maintenance cost of the metal can be reduced. When the brush 22 is a carbon brush, the slip ring 1 is a metal member, so that maintenance cost is low. And the carbon brush conducts electricity while rubbing the slip ring 1, and when the carbon brush rubs with the slip ring 1, the carbon brush is abraded, and the abrasive dust can be used as a lubricating agent to play a lubricating role, so that the friction force between the carbon brush and the slip ring 1 is reduced, and the current flowing through each carbon brush is uniform.

Typically the brushes 22 are distributed over the upper half of the brush holder 2 to ensure that the brushes 22 and the slip ring 1 are in contact, as shown in fig. 1-2, the brushes 22 generally being avoided from being arranged at the lowest point of the brush holder 2.

In another embodiment, a plurality of circumferentially spaced brushes 22 are connected to each conducting plate assembly 21, and the brushes 22 are used for transmitting the current on the slip ring 1 to the conducting plate assembly 21 and then leading out the current through the conducting plate assembly 21; a pressure spring is fixed to the brush holder 2, and one end of the brush 22, which is away from the slip ring 1, is fixedly connected to the pressure spring, and in this embodiment, the brush 22 is arranged to be located above a first central plane, wherein the first central plane extends in the horizontal direction, and the axis of the slip ring 1 is located in the first central plane. The arrangement is that the power of the contact between the brush 22 and the slip ring 1 comes from the spring force of the compression spring as the brush 22 and the slip ring 1 are in sliding contact; the arrangement of the brush 22 is usually made in consideration of the influence of the self weight of the brush 22 on the contact of the brush 22 and the slip ring 1, and for convenience, it is described in this application based on the orientation of mounting; in the above embodiment, the brush 22 is disposed above the first central surface, and it is possible to prevent an event that the pressing spring is compressed by the force of the brush 22 under the gravity of the brush 22 when the brush 22 is located above the pressing spring, so that the brush 22 and the slip ring 1 are disengaged, thereby affecting the current transmission. Thereby being beneficial to improving the condition of uneven current of the carbon brush.

In order to further improve the condition of uneven current of the brush 22. Referring to fig. 5-6, all of the brushes 22 on the plate assembly 21 are equally spaced circumferentially within 180 of the circumferential direction of the brush holder 2 above the first central plane.

In still another embodiment, referring to fig. 6, the second conductive part 212 includes a guide cable 2120, and both ends of the guide cable 2120 are connected to both ends of the first conductive part 211 in the circumferential direction. Thus, the first conductive part 211 and the guide cable 2120 are connected to form a closed ring sleeved on the outer periphery of the slip ring 1. Thereby improving the condition of uneven current of the brush 22.

In yet another embodiment, referring to fig. 6, brush 22 is mounted on first conductive portion 211. All the brushes 22 in both ends in the circumferential direction of the first conductive portion 211 are equally spaced in the circumferential direction. In this embodiment, the first conductive portion 211 has an arc-shaped plate-shaped structure, the second conductive portion 212 has two guide cables 2120, and two ends of each guide cable 2120 are connected to two ends of the first conductive portion 211 in the circumferential direction. The guide cable 2120 and the arc-shaped plate-shaped structure are connected to form a closed ring sleeved on the periphery of the slip ring 1. In this embodiment, at least one fluid conducting cable 2120 is disposed on each conductive plate assembly 21. In some wind power installations, it is common to provide between 1 and 10 conductor cables 2120 per conductor panel assembly 21.

In yet another embodiment, referring to FIGS. 1-5, the first conductive portion 211 and the second conductive portion 212 are a unitary structure. In this case, the shape of first conductive portion 211 and second conductive portion 212 may be circular ring plates having both circular inner and outer peripheries, or may be a deformation of the circular ring plates, as shown in fig. 5.

In yet another embodiment, each conductive plate assembly 21 is provided with at least one outlet connection structure 213 for connecting an output wire to conduct current from the conductive plate assembly 21. The outlet connection structures 213 may be provided in one or more number according to the size of the slip ring device. The outlet connection structure 213 may be a connection hole or a connection post. The outlet connection structure 213 may be disposed on the first conductive portion 211, as shown in fig. 6, or may be disposed on the second conductive portion 212. When there are a plurality of outlet connection structures 213, a part of the outlet connection structures may be disposed on the first conductive portion 211 and another part of the outlet connection structures may be disposed on the second conductive portion 212. The number of the outlet connection structures 213 is generally determined according to the size of the slip ring device, so as to save most cost. When the slip ring device is large and the number of the outgoing line connection structures 213 is small, the output wires connected to the outgoing line connection structures 213 are too thick and heavy, which increases the installation difficulty and increases the workload. When the number of the outlet connection structures 213 is large, the number of the output wires connected to the outlet connection structures 213 is too large and thin, and the mounting workload is also increased.

For ease of installation and maintenance, especially in wind turbine generator systems, the outgoing line connection structure 213 is typically arranged in the middle and/or lower part of the above-mentioned closed ring, which is advantageous for installation, because the generator in a wind turbine generator system is typically large, and when the outgoing line connection structure 213 is arranged in the upper part of the slip ring device, it is not advantageous to install the outgoing line connection structure 213 connected to the outgoing line connection structure 213, and referring to fig. 2, the outgoing line connection structure 213 is typically arranged near the middle or lower part of the slip ring device. Because in the wind generating set, the space is compacter, and the output wire that derives the electric current from the sliding ring device needs to descend, arranges outlet connection structure 213 in the middle part or the lower part of above-mentioned closed ring, and the usage space of instrument is great, is favorable to the dismouting.

In yet another embodiment, referring to fig. 2, the outgoing line connection structure 213 is arranged at the lower part of the conducting plate assembly 21, and the angle between the line connecting the outgoing line connection structure 213 with the center of the conducting plate assembly 21 and a second central plane is not more than 60 °, wherein the second central plane is perpendicular to the first central plane, and the axis of the slip ring 1 is located in the second central plane. In addition to disposing the outlet connection structure 213 at the lower portion of the conductive plate assembly 21, in another embodiment, referring to fig. 5, the conductive plate assembly 21 includes a circular ring body defined by the first conductive portion 211 and the second conductive portion 212, a connecting lug 214 radially extending from an edge of the circular ring body, and the outlet connection structure 213 disposed on the connecting lug 214, in which case, the outlet connection structure 213 may be located at the middle portion of the closed ring. Through setting up engaging lug 214, can increase the size of being qualified for the next round of competitions connection structure 213 apart from slip ring device's centre bore 3 to can be so that relatively open provides the space for repair tools around the connection structure 213 that is qualified for the next round of competitions, be favorable to installing the development of maintenance work.

The embodiment is particularly suitable for the slip ring device with the inner diameter of the circular ring body being more than or equal to 300mm and the outer diameter of the circular ring body being less than or equal to 1000 mm. In the slip ring device, the thickness of the conductive plate component 21 is generally less than or equal to 5mm and less than or equal to 50mm.

A second aspect of the present application provides a generator comprising a slip ring arrangement as described above. The generator has the technical advantages of the slip ring device, and the details are not repeated.

A third aspect of the application provides a wind power plant comprising a generator as described above. The wind generating set has the technical advantages of the generator, and the description is omitted.

It should be understood that the term "and/or" herein is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists singly, A and B exist simultaneously, and B exists singly, wherein A and B can be singular or plural. In addition, the "/" in this document generally indicates that the former and latter associated objects are in an "or" relationship, but may also indicate an "and/or" relationship, which may be understood with particular reference to the former and latter text.

In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c or a-b-c, wherein a, b and c can be single or multiple.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not imply any order of execution, and the order of execution of the processes should be determined by their functions and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modifications, equivalents and the like that are within the spirit and principle of the present application should be included in the scope of the present application.

Claims (10)

1. A slip ring device is characterized by comprising a brush holder (2) which is arranged concentrically with a slip ring (1), wherein a brush (22) which is in sliding contact with the slip ring (1) is fixed on the brush holder (2), a plurality of conducting plate assemblies (21) which are arranged at intervals in the axial direction are arranged on the brush holder (2), the conducting plate assemblies (21) are electrically connected with the brush (22), each conducting plate assembly (21) comprises a first conducting part (211) and a second conducting part (212), and the first conducting part (211) and the second conducting part (212) are circumferentially connected into a closed ring.

2. Slip ring arrangement according to claim 1, characterized in, that the brushes (22) are carbon brushes.

3. Slip ring arrangement according to claim 1, characterized in that a plurality of circumferentially spaced brushes (22) are connected to each conducting plate assembly (21), that a hold-down spring is fixed to the brush holder (2), that an end of the brush (22) facing away from the slip ring (1) is secured to the hold-down spring, and that the brush (22) is located above a first central plane, wherein the first central plane extends in a horizontal direction and the axis of the slip ring (1) is located within the first central plane.

4. Slip ring arrangement according to claim 1, characterized in that the first conductive part (211) and the second conductive part (212) are of a unitary structure.

5. Slip ring arrangement according to claim 3, characterized in that at least one outlet connection structure (213) for connecting output wires is provided on each of the conductor plate assemblies (21) to derive current on the conductor plate assemblies (21).

6. Slip ring device according to claim 5, characterized in that the outgoing line connection structure (213) is arranged in a lower part of the conductive plate assembly (21), and that the outgoing line connection structure (213) has an angle of not more than 60 ° with a line connecting the centers of the conductive plate assembly (21) and a second central plane, wherein the second central plane is perpendicular to the first central plane and the axis of the slip ring (1) is located in the second central plane.

7. Slip ring device according to claim 5, characterized in that the conducting plate assembly (21) comprises a ring body defined by the first and second conducting parts (211, 212) and a coupling lug (214), the coupling lug (214) extending radially from an edge of the ring body, the outgoing line connection structure (213) being provided on the coupling lug (214).

8. Slip ring device according to claim 1, characterized in that the second conductive part (212) comprises a current guiding cable (2120), both ends of the current guiding cable (2120) being connected at both ends of the first conductive part (211) in circumferential direction.

9. A generator, characterized in that it comprises a slip ring arrangement according to any of claims 1-8.

10. A wind power plant comprising a generator according to claim 9.

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