Tandem double-spring structure for brush holder, carbon brush assembly and hydro-generator

Abstract

The utility model discloses a series connection double spring structure for a brush holder, a carbon brush assembly and a hydro-generator, a buffer spring is arranged at the rear end of a carbon brush, a constant pressure spring is arranged behind the buffer spring, and the buffer spring and the constant pressure spring form a series connection structure. According to the utility model, the rear end of the carbon brush is provided with the buffer spring, and when the collector ring swings in the rotation process, the buffer spring absorbs periodic impact generated by swinging, buffers the acting force of the swinging, prevents the carbon brush from bouncing due to swinging, effectively reduces the dynamic displacement amplitude of the carbon brush, and improves the reliability of the collector ring. The contact between the carbon brush and the collector ring is not influenced by bounce generated by the swing, so that the contact between the carbon brush and the collector ring is stable; the unfavorable phenomena of carbon brush sparking, carbon brush temperature rise and the like caused by poor contact between the electrode and the collector ring are avoided, and the unfavorable conditions that the surface of the collector ring is burnt by instantaneous high temperature generated by sparking, the surface smoothness of the collector ring is reduced, and tiny pits are formed are avoided.

Description

Technical Field

[0001] This utility model relates to a brush holder structure for a hydroelectric generator set, specifically to a series double spring structure for a brush holder of a hydroelectric generator, a carbon brush assembly, and a hydroelectric generator. Background Technology

[0002] For hydroelectric generator sets, during operation, the main shaft drives the slip rings to rotate synchronously, and the slip rings form a conductive path through the carbon brushes in contact with them. However, due to factors such as manufacturing and installation precision, wear of generator components during operation, and the impact of pulsating water flow on the main shaft, the rotation of the main shaft and slip rings is uneven. The slip rings, moving at high speed, inevitably oscillate to varying degrees during rotation, causing periodic bouncing when the carbon brushes contact the slip rings, resulting in unstable contact. This poor contact not only causes carbon brush sparking and increased carbon brush temperature, but also burns the surface of the slip rings due to the instantaneous high temperature generated by sparking, reducing their surface smoothness and even forming tiny pits. These tiny pits, in turn, further exacerbate the instability of the contact between the carbon brushes and slip rings, affecting the stability of the entire hydroelectric generator system and the safe operation of the hydroelectric generator set. Summary of the Invention

[0003] To address the shortcomings of the existing technology, the technical problems to be solved by this utility model are: firstly, how to provide a series double spring structure for brush holders of hydro-generators to buffer and absorb the impact of the oscillation generated during the rotation of the slip ring, so as to stabilize the contact between the carbon brush and the slip ring; secondly, how to provide a carbon brush assembly for hydro-generator sets to stabilize the contact between the carbon brush and the slip ring; and thirdly, how to provide a hydro-generator for long-term safe operation.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A series double-spring structure for a brush holder includes a carbon brush; characterized in that a buffer spring is provided at the rear end of the carbon brush, and a constant pressure spring is provided after the buffer spring, the buffer spring and the constant pressure spring forming a series structure.

[0006] In this way, by setting a buffer spring at the rear end of the carbon brush, the buffer spring absorbs the periodic impact generated by the oscillation during the rotation of the slip ring, buffering the force of these oscillations and preventing the carbon brush from bouncing due to the oscillation. This effectively reduces the dynamic displacement amplitude of the carbon brush, ensuring that the contact between the carbon brush and the slip ring is not affected by the bouncing caused by the oscillation, thus stabilizing the contact between the two. Furthermore, because the buffer spring buffers the force of these oscillations, it avoids adverse phenomena such as carbon brush arcing and carbon brush temperature rise caused by poor contact between the two. It also avoids adverse conditions such as instantaneous high temperature from arcing burning the surface of the slip ring, reducing its surface smoothness, and forming small pits.

[0007] Furthermore, a movable slider is installed at the rear end of the carbon brush, with the two ends of a buffer spring positioned between the carbon brush and the slider, respectively. A constant-pressure spring is connected to the slider, allowing it to move along the slide rail towards the carbon brush. In this way, the left-right movement of the movable slider on the slide rail allows the buffer spring to absorb the periodic impacts generated by the oscillation and buffer the oscillating force of the slip ring during rotation. Especially when the slip ring experiences a large instantaneous oscillation, it can slide away from the slip ring to buffer the enormous impact force. Simultaneously, the constant-pressure spring provides a relatively uniform and constant force to the carbon brush.

[0008] Furthermore, a connecting pad is installed at the rear end of the carbon brush, and one end of the buffer spring is placed on the connecting pad. The connecting pad facilitates the placement of the buffer spring, making it easier to install and replace it.

[0009] Furthermore, guide posts are installed on the connecting pad, and connecting leads are installed on the slider. The two ends of the buffer spring are connected to the guide posts and connecting leads, respectively. By setting guide posts and connecting leads, the installation of the buffer spring is facilitated, making it easier to install and replace the buffer spring.

[0010] Furthermore, the diameters of the guide post and the connecting post are smaller than the diameter of the internal cavity of the buffer spring, and the two ends of the buffer spring are connected by inserting into the guide post and the connecting post, respectively. This simplifies the structure and facilitates the installation and replacement of the buffer spring.

[0011] Furthermore, a sliding groove is provided on the slider, through which the slider is slidably connected to the slide rail. In this way, the sliding groove facilitates the slider to slide on the slide rail without deviation or jamming.

[0012] A carbon brush assembly for a hydro-generator includes a carbon brush disposed within a brush holder and movable along its length; characterized in that a series double-spring structure for brush holding, as described above, is provided at the rear end of the carbon brush.

[0013] A hydro-generator includes a carbon brush assembly, characterized in that the carbon brush assembly is as described above.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. This utility model provides a buffer spring at the rear end of the carbon brush that contacts the slip ring. When the slip ring swings during rotation, the buffer spring absorbs the periodic impact generated by the swing, buffering the force of these swings and preventing the carbon brush from bouncing due to the swing. This effectively reduces the dynamic displacement amplitude of the carbon brush, ensuring that the contact between the carbon brush and the slip ring is not affected by the bouncing caused by the swing, thus stabilizing the contact between the two.

[0016] 2. Because the buffer spring buffers the force of these swings, it avoids the adverse phenomena such as carbon brush arcing and carbon brush temperature rise caused by poor contact between the two. It also avoids the adverse conditions such as instantaneous high temperature caused by arcing burning the surface of the collector ring, reducing its surface smoothness, and forming small pits.

[0017] 3. This utility model adopts a series structure of buffer spring and constant pressure spring. The constant pressure spring ensures that the carbon brush force is basically uniform and constant, while the buffer spring buffers and absorbs the impact of the oscillation generated during the rotation of the slip ring. The two work together to achieve safe operation of the carbon brush under high stability and high conductivity.

[0018] 4. The carbon brush assembly of the hydro-generator of this utility model avoids the adverse phenomena such as carbon brush arcing and carbon brush temperature rise caused by poor contact between the carbon brush and the slip ring.

[0019] 5. The hydro-generator of this utility model avoids adverse phenomena such as carbon brush sparking and carbon brush temperature rise caused by poor contact between carbon brush and slip ring, thus improving operational safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the series double spring structure for the brush holder of the hydro-generator of this utility model;

[0021] Figure 2 yes Figure 1 Top view;

[0022] Figure 3 yes Figure 1 Sectional view along AA.

[0023] In the diagram: 1-carbon brush, 2-brush box, 3-constant pressure spring, 4-buffer spring, 5-slider, 6-slide rail, 7-connecting pad, 8-guide post, 9-connecting guide post, 10-sliding slot. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0026] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The brush holder of the hydro-generator provided in this embodiment has a series double spring structure, such as... Figure 1As shown in Figure 3, the device is configured in conjunction with the generator slip ring, including a carbon brush 1. The front end of the carbon brush 1, located within the brush holder 2, contacts the surface of the slip ring, forming a conductive structure. A constant pressure spring 3 is typically installed at the rear end of the carbon brush 1 to generate uniform pressure, ensuring close contact between the front end of the carbon brush 1 and the surface of the slip ring. The above is a prior art structure and will not be further described here.

[0028] This utility model relates to a series double-spring structure for a hydro-generator brush holder. A buffer spring 4 is installed at the rear end of the carbon brush 1, and a constant pressure spring 3 is installed after the buffer spring 4, forming a series structure. In the specific embodiment shown in the figure, a movable slider 5 is installed at the rear end of the carbon brush 2. The two ends of the buffer spring 4 are respectively positioned between the carbon brush 1 and the slider 5. The constant pressure spring 3 is connected to the slider 5. When the carbon brush 1 is worn down and shortened, the constant pressure spring 3 generates a spring force acting on the slider 5, pushing the slider 5 to move towards the carbon brush 1 on the slide rail 6, so that the front end of the carbon brush 1 makes close contact with the surface of the slip ring. The buffer spring 4 can have various structures, such as a coil spring or a pressure spring.

[0029] To ensure a stable and reliable connection between the buffer spring 4 and the rear end of the carbon brush 1, a connecting pad 7 is provided at the rear end of the carbon brush 1, and one end of the buffer spring 4 is placed on the connecting pad 7. In a further improved structure of this utility model, a guide post 8 is provided on the connecting pad 7, and a connecting post 9 is provided on the slider 5. The two ends of the buffer spring 4 are respectively connected to the guide post 8 and the connecting post 9. The diameters of the guide post 8 and the connecting post 9 are smaller than the diameter of the internal cavity of the buffer spring 4, and the two ends of the buffer spring 4 are connected by inserting into the guide post 8 and the connecting post 9 through the internal cavity.

[0030] The connection structure between the slider 5 and the slide rail 6 of this utility model is that a sliding groove 10 is provided on the slider 5, and the slider 5 is slidably connected to the slide rail 6 through the sliding groove 10 to form a movable connection structure, which makes it easy for the slider 5 to slide on the slide rail 6 under the spring action generated by the constant pressure spring 3.

[0031] This invention incorporates a buffer spring at the rear end of the carbon brush. When the slip ring oscillates during rotation, the buffer spring cushions the force of this oscillation, preventing the carbon brush from bouncing due to the oscillation and effectively reducing the dynamic displacement amplitude of the carbon brush, thus stabilizing the contact between the slip ring and the carbon brush. A constant-pressure spring ensures that the force applied to the carbon brush is essentially uniform and constant, and also drives the slider to slide on the rail, further stabilizing the contact between the slip ring and the carbon brush. This invention employs a series structure of a buffer spring and a constant-pressure spring. The constant-pressure spring ensures that the force applied to the carbon brush is essentially uniform and constant, while the buffer spring buffers and absorbs the impact of the oscillation generated during the rotation of the slip ring. The combined effect of these two springs achieves safe operation of the carbon brush under high stability and high conductivity conditions, improving the safety performance of the generator set.

[0032] A carbon brush assembly for a hydro generator includes a carbon brush 1, which is disposed in a brush holder 2 and can move along the length of the carbon brush 1; a series double spring structure for brush holder is provided at the rear end of the carbon brush 1.

[0033] A hydro-generator includes a carbon brush assembly, the carbon brush assembly including a carbon brush 1, the carbon brush 1 being disposed in a brush holder 2 and movable along the length direction; a aforementioned series double spring structure for brush holder is provided at the rear end of the carbon brush 1.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit the technical solution. Although the applicant has described this utility model in detail with reference to preferred embodiments, those skilled in the art should understand that any modifications or equivalent substitutions to the technical solution of this utility model without departing from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A series double-spring structure for a brush holder, comprising a carbon brush (1); characterized in that, A buffer spring (4) is set at the rear end of the carbon brush (1), and a constant pressure spring (3) is set after the buffer spring (4). The constant pressure spring (3) is set after the buffer spring (4) to form a series structure.

2. The series double-spring structure for brush holder according to claim 1, characterized in that, A movable slider (5) is set at the rear end of the carbon brush (1). The two ends of the buffer spring (4) are respectively set between the carbon brush (1) and the slider (5). The constant pressure spring (3) is connected to the slider (5). The slider (5) can move on the slide rail (6).

3. The series double-spring structure for brush holder according to claim 2, characterized in that, A connecting pad (7) is set at the rear end of the carbon brush (1), and one end of the buffer spring (4) is set on the connecting pad (7).

4. The series double-spring structure for brush holder according to claim 3, characterized in that, A guide post (8) is set on the connecting pad (7), and a connecting post (9) is set on the slider (5). The two ends of the buffer spring (4) are respectively connected to the guide post (8) and the connecting post (9).

5. The series double-spring structure for brush holder according to claim 4, characterized in that, The diameters of the guide post (8) and the connecting post (9) are smaller than the diameter of the internal cavity of the buffer spring (4). The two ends of the buffer spring (4) are respectively inserted into the guide post (8) and the connecting post (9) for connection.

6. The series double-spring structure for brush holder according to any one of claims 2-5, characterized in that, A sliding slot (10) is provided on the slider (5), and the slider (5) is slidably connected to the slide rail (6) through the sliding slot (10).

7. A carbon brush assembly for a hydro-generator, comprising a carbon brush (1), the carbon brush (1) being disposed within a brush holder (2) and movable along its length; characterized in that, A series double spring structure for brush grip as described in any one of claims 1-6 is provided at the rear end of the carbon brush (1).

8. A hydro-generator, comprising a carbon brush assembly, characterized in that, The carbon brush assembly is as described in claim 7.

Images