Electric brush assembly for high-voltage electric energy transmission and high-voltage electric energy transmission system

Abstract

The invention discloses an electric brush assembly for high-voltage electric energy transmission and a high-voltage electric energy transmission system, and relates to the technical field of electric power transmission systems.The electric brush assembly for high-voltage electric energy transmission comprises a conductor, an insulating supporting sleeve, an electric brush fixing terminal and an electric brush, and the conductor is used for transmitting current; the insulating supporting sleeve is sleeved outside the conductor, the insulating supporting sleeve is used for penetrating through the wall surface of the shell and is fixed on the shell, and the insulating supporting sleeve positioned in the shell forms a cantilever structure and extends towards the electric slip ring; the end part of the conductor in the shell extends out of the insulating support sleeve; the electric brush fixing terminal is fixedly arranged on the conductor in the shell, the electric brush fixing terminal is in contact with the conductor, and the electric brush fixing terminal is made of a conductive material; and the electric brush is arranged on the electric brush fixing terminal and is used for being in sliding contact with the conductive surface of the electric slip ring. The uniformity of the high-voltage electric field can be improved.

Description

Technical Field

[0001] This invention relates to the field of power transmission system technology, and in particular to a brush assembly for high-voltage power transmission and a high-voltage power transmission system. Background Technology

[0002] In power transmission systems, brushes are key components connecting stationary and rotating parts, and their contact stability directly affects the efficiency and reliability of power transmission. In the field of high-voltage equipment, the uniformity of the electric field distribution inside the equipment is even more crucial, having a decisive impact on whether the equipment can operate safely and stably.

[0003] Traditional brush mounting structures are typically squirrel-cage type, with the foundation fixed at the top or bottom of the equipment casing. Each transmission channel's annular plate is supported and fixed by insulating supports, and the brush holder is then fixed to the annular plate. This structure is widely used in low-voltage equipment, but in high-voltage equipment, the complex overall fixed support structure has many areas prone to field strength concentration, such as the edges of parts and the contact surfaces between insulation and metal materials. This significantly increases the risk of partial discharge, thereby reducing the uniformity of the high-voltage electric field. Summary of the Invention

[0004] The purpose of this invention is to provide a brush assembly and a high-voltage power transmission system for high-voltage power transmission, so as to solve the problems existing in the prior art and improve the uniformity of the high-voltage electric field.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a brush assembly for high-voltage power transmission, comprising: a conductor, an insulating support sleeve, a brush fixing terminal, and a brush. The conductor is used to transmit current. The insulating support sleeve is sleeved outside the conductor, passing through the wall of a housing and fixed to the housing. The insulating support sleeve located inside the housing forms a cantilever structure and extends toward an electric slip ring. The end of the conductor located inside the housing extends out from the insulating support sleeve. The brush fixing terminal is fixedly disposed on the conductor inside the housing, and the brush fixing terminal is in contact with the conductor. The brush fixing terminal is made of a conductive material. The brush is mounted on the brush fixing terminal and is used for sliding contact with the conductive surface of the electric slip ring.

[0006] Preferably, the brush is movably disposed on the brush fixing terminal along the direction close to the slip ring, and a spring is disposed on the side of the brush away from the slip ring. Under normal conditions, the spring is in a compressed state and one end of the spring abuts against the brush so that the brush has a tendency to move toward the slip ring.

[0007] Preferably, the end of the spring away from the brush rests against the end of the conductor.

[0008] Preferably, the spring sleeve is provided with a pressure equalizing ring, and both ends of the spring are always within the effective range of the pressure equalizing ring, and the brush fixing terminal is also within the effective range of the pressure equalizing ring.

[0009] Preferably, the equalizing ring is fixedly connected to the brush fixing terminal by screws.

[0010] Preferably, the insulating support sleeve is provided with a connecting flange, which is used for fixed connection with the outer shell.

[0011] Preferably, one end of the brush fixing terminal is provided with a brush holder, which can be clamped onto the conductor.

[0012] Preferably, the brush is mounted on the brush fixing terminal by a semi-annular clamping member. The brush fixing terminal has a horizontally set mounting surface. The clamping member is detachably mounted on the mounting surface. The clamping member presses the brush against the mounting surface. In the clamped state, the brush tends to move towards the slip ring under the rebound action of the spring.

[0013] Preferably, the conductor is a copper rod.

[0014] The present invention also provides a high-voltage power transmission system, including a housing, an electric slip ring, and a high-voltage power transmission brush assembly as described above; the high-voltage power transmission brush assembly is disposed on the wall surface of the housing, the electric slip ring is located inside the housing, and the brushes of the high-voltage power transmission brush assembly are always in contact with the conductive surface of the electric slip ring.

[0015] The present invention achieves the following technical effects compared to the prior art: The high-voltage power transmission brush assembly provided by this invention adopts an independent support structure connected to the outer shell, which simplifies the support structure, reduces the concentration points of electric field, and thus ensures the uniformity of the high-voltage electric field.

[0016] Furthermore, the present invention employs an equalizing ring to uniformly distribute the electric field between the contact points of the spring and conductor, the contact points of the spring and brush, and the connection points of the brush fixing terminal and conductor, thereby preventing the concentration of electric field strength at the connection points and edges of the components.

[0017] Furthermore, the present invention employs a spring to provide the clamping force of the brush and the feed compensation after brush wear. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the high-voltage power transmission brush assembly provided in an embodiment of the present invention; Figure 2 for Figure 1 The diagram below shows the structure of the brush assembly for high-voltage power transmission after removing the equalizing ring. Figure 3 A schematic diagram of the conductor, brush fixing terminal, spring, and brush structure; Figure 4 for Figure 2 A sectional view; In the diagram: 1-Insulating support sleeve; 2-Brush; 3-Equalizing ring; 4-Brush fixing terminal; 5-Conductor; 6-Connecting flange; 7-Brush holder; 8-Clamping component; 9-Spring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a brush assembly and a high-voltage power transmission system for high-voltage power transmission, so as to solve the problems existing in the prior art and improve the uniformity of the high-voltage electric field.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Existing complex, integral fixed support structures (such as traditional squirrel cage structures) are intricate, making it difficult to maintain a uniform electric field distribution. This easily leads to areas with localized electric field strengths far exceeding design values ​​at component edges, the contact surfaces between insulating supports and metal surfaces, and other locations, significantly increasing the risk of partial discharge (corona discharge) or even insulation breakdown. This is precisely the key reason why this invention employs a single-point cantilever support (insulating support sleeve) and a terminal equalizing ring design, greatly simplifying the structure, reducing electric field concentration points, and actively controlling the electric field distribution in critical areas through the equalizing ring.

[0024] The following is combined with Figures 1 to 4The following describes embodiments of the present invention.

[0025] Example 1 This invention provides a brush assembly for high-voltage power transmission, comprising: a conductor 5, an insulating support sleeve 1, a brush fixing terminal 4, and a brush 2. The conductor 5 is used to transmit current. The insulating support sleeve 1 is sleeved on the outside of the conductor 5 and is used to pass through the wall of the outer shell and be fixed to the outer shell. The insulating support sleeve 1 located inside the outer shell forms a cantilever structure and extends toward the slip ring. The end of the conductor 5 located inside the outer shell extends out from inside the insulating support sleeve 1. The brush fixing terminal 4 is fixedly disposed on the conductor 5 inside the outer shell and is in contact with the conductor 5. The brush fixing terminal 4 is made of conductive material. The brush 2 is mounted on the brush fixing terminal 4 and is used to slide in contact with the conductive surface of the slip ring.

[0026] In this embodiment, the current on the slip ring is transmitted sequentially through the brush 2, the brush fixing terminal 4, and the conductor 5 to the device outside the housing.

[0027] The high-voltage power transmission brush assembly provided by this invention adopts an independent support structure connected to the outer shell, which simplifies the support structure, reduces the concentration points of electric field, and thus ensures the uniformity of the high-voltage electric field.

[0028] In some examples, the brush fixing terminal 4 is made of copper alloy conductive material.

[0029] In some embodiments, the brush 2 is movably disposed on the brush fixing terminal 4 along the direction close to the slip ring, and a spring 9 is disposed on the side of the brush 2 away from the slip ring. Under normal conditions, the spring 9 is in a compressed state and one end of the spring 9 abuts against the brush 2 so that the brush 2 has a tendency to move toward the slip ring.

[0030] The present invention uses spring 9 to provide the clamping force of brush 2 and the feed compensation after brush 2 wears.

[0031] In some embodiments, the end of the spring 9 away from the brush 2 rests against the end of the conductor 5.

[0032] The spring 9 in this invention is made of metal, which can also bear part of the current transmission. This increases the current transmission path and thus improves the stability of current transmission.

[0033] In some examples, a limiting sleeve is fixedly provided at the end of the brush 2 facing the conductor 5, and at least part of the spring 9 is located inside the limiting sleeve. The limiting sleeve is used to limit the spring 9 to prevent it from deflecting.

[0034] In some embodiments, a pressure equalization ring 3 is provided around the spring 9. Both ends of the spring 9 are always within the range of action of the pressure equalization ring 3. The brush fixing terminal 4 is located within the range of action of the pressure equalization ring 3. It can be understood that the connection between the brush fixing terminal 4 and the conductor 5, and the connection between the brush fixing terminal 4 and the brush 2 are all located within the range of action of the pressure equalization ring 3.

[0035] In this embodiment of the invention, an equalizing ring 3 is used to even out the electric field between the contact area of ​​the spring 9 and the conductor 5, the contact area of ​​the spring 9 and the brush 2, and the connection area between the brush fixing terminal 4 and the conductor 5, so as to avoid the concentration of electric field strength at the connection points and edges of the parts.

[0036] The effective range refers to the range within which the equalizing ring 3 can create a uniform electric field.

[0037] It should be noted that, Figure 1 The equalizing ring 3 in this embodiment is not a complete equalizing ring 3. In order to make it easier to see the internal structure of the equalizing ring 3, only half of the structure is shown. It can be understood that the equalizing ring 3 in this embodiment is a complete closed ring structure.

[0038] In some examples, the equalizing ring 3 is either hollow or solid.

[0039] In some embodiments, the equalizing ring 3 is fixedly connected to the brush fixing terminal 4 by screws.

[0040] Specifically, the equalizing ring 3 has a connecting strip inside, which extends to the upper or lower side of the brush fixing terminal 4. The connecting strip is fixedly connected to the brush fixing terminal 4 by screws. The connecting strip is also within the effective range of the equalizing ring 3.

[0041] like Figure 3 As shown, a threaded hole is provided on the upper side of the brush fixing terminal 4, which is used to engage screws to fix the connecting strip.

[0042] In some embodiments, an external connecting flange 6 is provided on the insulating support sleeve 1, which is used for fixed connection with the outer shell.

[0043] This embodiment provides a method for connecting the insulating support sleeve 1 and the outer shell.

[0044] In some embodiments, one end of the brush fixing terminal 4 is provided with a brush holder 7, which can be clamped onto the conductor 5.

[0045] This embodiment provides a method for connecting the brush fixing terminal 4 and the conductor 5.

[0046] Specifically, the brush holder 7 has an opening and a certain elastic deformation capacity, which is to facilitate the brush holder 7 being fitted onto the conductor 5. After the brush holder 7 is fitted onto the conductor 5, the two sides of the opening of the brush holder 7 are connected by screws or bolts, and the two sides of the opening are brought closer together by tightening the screws or bolts to press them onto the conductor 5, thereby achieving fixation.

[0047] In some embodiments, the brush 2 is mounted on the brush fixing terminal 4 by a semi-annular clamping member 8. The brush fixing terminal 4 has a horizontally set mounting surface. The clamping member 8 is detachably mounted on the mounting surface. The clamping member 8 presses the brush 2 against the mounting surface. Under the rebound action of the spring 9, the brush 2 in the clamped state tends to move towards the slip ring.

[0048] This embodiment provides a brush mounting structure in which the clamping member 8 is also located within the effective range of the equalizing ring 3.

[0049] In some embodiments, conductor 5 is a copper rod.

[0050] This embodiment provides the structure of conductor 5. Specifically, conductor 5 can also be made of other metallic materials.

[0051] In this embodiment of the invention, the insulating support sleeve 1 is pressed and fixed to the equipment housing by the connecting flange 6, and extends cantilevered into the housing to the brush fixing point. The insulating support sleeve 1 is designed to have sufficient rigidity. The external insulating material ensures the insulation performance between the equipment housing and the high-voltage channel. The internal copper rod serves as a conductor 5 for connection and fixing with the brush fixing terminal and for power transmission.

[0052] Example 2 The present invention provides a high-voltage power transmission system, including a housing, an electric slip ring, and a high-voltage power transmission brush assembly as described in Embodiment 1; the high-voltage power transmission brush assembly is disposed on the wall surface of the housing, the electric slip ring is located inside the housing, and the brush 2 of the high-voltage power transmission brush assembly is always in contact with the conductive surface of the electric slip ring.

[0053] In this embodiment, the current on the slip ring is transmitted sequentially through the brush 2, the brush fixing terminal 4, and the conductor 5 to the device outside the housing. The high-voltage power transmission brush assembly provided by the present invention adopts an independent support structure connected to the housing, which simplifies the support structure, reduces the concentration points of electric field, and thus ensures the uniformity of the high-voltage electric field.

[0054] Furthermore, this embodiment possesses all the advantages of Embodiment 1, which will not be elaborated upon here.

[0055] In the description of this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0056] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0057] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0058] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0059] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0060] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0061] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0062] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A brush assembly for high-voltage power transmission, characterized in that: include: Conductor (5), used to transmit current; An insulating support sleeve (1) is sleeved outside the conductor (5). The insulating support sleeve (1) is used to pass through the wall of the outer shell and be fixed on the outer shell. The insulating support sleeve (1) located inside the outer shell forms a cantilever structure and extends toward the electric slip ring. The end of the conductor (5) located inside the outer shell extends out from the insulating support sleeve (1). The brush fixing terminal (4) is fixedly disposed on the conductor (5) inside the housing. The brush fixing terminal (4) is in contact with the conductor (5). The brush fixing terminal (4) is made of conductive material. The brush (2) is mounted on the brush fixing terminal (4) and is used to slide in contact with the conductive surface of the slip ring.

2. The brush assembly for high-voltage power transmission according to claim 1, characterized in that: The brush (2) is movably disposed on the brush fixing terminal (4) along the direction close to the slip ring. A spring (9) is disposed on the side of the brush (2) away from the slip ring. Under normal conditions, the spring (9) is in a compressed state and one end of the spring (9) abuts against the brush (2) so that the brush (2) has a tendency to move toward the slip ring.

3. The brush assembly for high-voltage power transmission according to claim 2, characterized in that: The end of the spring (9) away from the brush (2) abuts against the end of the conductor (5).

4. The brush assembly for high-voltage power transmission according to claim 3, characterized in that: The spring (9) is fitted with an equalizing ring (3), and both ends of the spring (9) are always within the range of action of the equalizing ring (3). The brush fixing terminal (4) is also within the range of action of the equalizing ring (3).

5. The brush assembly for high-voltage power transmission according to claim 4, characterized in that: The equalizing ring (3) is fixedly connected to the brush fixing terminal (4) by screws.

6. The brush assembly for high-voltage power transmission according to claim 1, characterized in that: The insulating support sleeve (1) is provided with a connecting flange (6), which is used to fix it to the outer shell.

7. The brush assembly for high-voltage power transmission according to claim 1, characterized in that: One end of the brush fixing terminal (4) is equipped with a brush holder (7), which can be clamped onto the conductor (5).

8. The brush assembly for high-voltage power transmission according to claim 2, characterized in that: The brush (2) is mounted on the brush fixing terminal (4) by a semi-circular clamping member (8). The brush fixing terminal (4) has a horizontally set mounting surface. The clamping member (8) is detachably mounted on the mounting surface. The clamping member (8) presses the brush (2) against the mounting surface. Under the rebound action of the spring (9), the brush (2) in the clamped state tends to move towards the slip ring.

9. The brush assembly for high-voltage power transmission according to claim 1, characterized in that: The conductor (5) is a copper rod.

10. A high-voltage power transmission system, characterized in that: The device includes a housing, an electric slip ring, and a high-voltage power transmission brush assembly as described in any one of claims 1 to 9; the high-voltage power transmission brush assembly is disposed on the wall surface of the housing, the electric slip ring is located inside the housing, and the brush (2) of the high-voltage power transmission brush assembly is always in contact with the conductive surface of the electric slip ring.

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