A high-stability constant-voltage brush device and a generator

Abstract

The application discloses a high-stability constant-pressure brush device and a generator, which comprise an outer cylinder, an inner cylinder, a brush rod and an elastic piece. The inner cylinder is sleeved in the outer cylinder, a sealed inner cavity is formed between the outer cylinder and the inner cylinder, the outer cylinder is provided with an inlet and an outlet which are communicated with the inner cavity, and the inlet and the outlet are used for circulating fluid medium to dissipate heat. The brush rod is slidably installed in the inner cylinder, the elastic piece is arranged in the inner cylinder, one end of the elastic piece abuts against the brush rod, and the other end of the elastic piece abuts against the brush rod, so as to provide constant axial compression force to the brush rod. The fluid circulation inner cavity formed by the outer cylinder and the inner cylinder realizes efficient heat dissipation of the elastic piece and the brush rod, and high-temperature thermal recession is avoided. The elastic force of the elastic piece drives the brush rod to be in constant pressure contact, and the stability of the brush pressure is obviously improved.

Description

Technical Field

[0001] This application relates to the field of hydropower generation technology, and more specifically, to a highly stable constant voltage brush device and generator. Background Technology

[0002] Traditional brush devices often use springs or mechanical structures to maintain brush pressure. However, under high-temperature conditions, the pressure fluctuates due to thermal decay of the elastic elements, leading to accelerated wear between the brush and the contact surface, increased contact resistance, and spark discharge. Existing heat dissipation solutions mostly rely on natural cooling or forced air cooling, which has low heat dissipation efficiency and is easily affected by environmental interference, making it difficult to meet the heat dissipation requirements of continuous operation of high-current equipment. In addition, the separate design of the brush assembly and the heat dissipation structure tends to increase the device size and make maintenance inconvenient. There is an urgent need to develop a highly stable constant-voltage brush device to solve the above problems. Utility Model Content

[0003] This application provides a highly stable constant-voltage brush device, including an outer cylinder, an inner cylinder, a brush rod, and an elastic element. The inner cylinder is sleeved inside the outer cylinder, and a sealed inner cavity is formed between the outer cylinder and the inner cylinder. The outer cylinder has an inlet and an outlet communicating with the inner cavity, and the inlet and outlet are used for circulating fluid medium for heat dissipation. The brush rod is slidably installed inside the inner cylinder, and the elastic element is disposed inside the inner cylinder. One end of the elastic element abuts against the brush rod, and the other end abuts against the brush rod, for providing a constant axial clamping force to the brush rod.

[0004] In some embodiments, the inner cylinder is a stepped cylinder structure, with a front cylinder and a rear cylinder coaxially connected, the inner diameter of the front cylinder being smaller than the inner diameter of the rear cylinder; the outer periphery of the brush rod is provided with a radially protruding retaining ring, the retaining ring slidingly engaging with the inner wall of the rear cylinder, and the elastic element abutting between the retaining ring and the end of the rear cylinder.

[0005] In some embodiments, the elastic element is a spring, which is located inside the rear cylinder and sleeved outside the brush rod, with its two ends abutting against the retaining ring and the outer cylinder, respectively.

[0006] In some embodiments, the end of the rear cylinder is sealed to the inner wall of the outer cylinder via a sealing gasket.

[0007] In some embodiments, the outer cylinder is provided with an mounting cylinder, and the inner wall of the mounting cylinder is connected to the outer wall of the front cylinder by a thread.

[0008] In some embodiments, a sealing ring is provided at the connection between the front cylinder and the rear cylinder, and the sealing ring is clamped between the end of the mounting cylinder and the outer wall of the rear cylinder.

[0009] In some embodiments, the inlet and outlet are diagonally distributed along the axial direction of the outer cylinder, and the inlet is located near the clamping end of the brush rod.

[0010] In some embodiments, the brush device further includes a connecting wire, one end of which is snapped into one end of the brush rod.

[0011] This application also provides a generator, including a slip ring, a brush holder and the above-mentioned brush assembly, wherein the outer cylinder is fixed on the brush holder and the pressing end of the brush rod elastically abuts against the outer surface of the slip ring.

[0012] This invention utilizes the fluid circulation cavity formed by the outer and inner cylinders to achieve efficient heat dissipation between the elastic element and the brush rod, preventing high-temperature thermal degradation. The elastic element's force drives the brush rod to maintain constant pressure contact, significantly improving the stability of the brush pressure. The integrated structure, while reducing size, also features enhanced heat dissipation and pressure self-regulation, effectively reducing contact resistance and wear, and extending the device's service life.

[0013] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0014] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0015] Figure 1 This is a schematic diagram of the overall structure of the generator according to the embodiment of this application;

[0016] Figure 2 This is the implementation method of this application. Figure 1 A half-sectional schematic diagram of the intermediate brush device;

[0017] Figure 3 yes Figure 2 An enlarged view of part A in the middle;

[0018] Figure 4 yes Figure 2 A magnified view of part B in the image.

[0019] Explanation of symbols for main components: brush device 100, outer cylinder 10, inner cavity 11, mounting cylinder 12, inlet 13, outlet 14, inner cylinder 20, front cylinder 21, rear cylinder 22, sealing gasket 23, sealing ring 24, brush rod 30, retaining ring 31, elastic element 40. Detailed Implementation

[0020] The embodiments of this application will be further described below with reference to the accompanying drawings. The same or similar reference numerals in the drawings denote the same or similar elements or elements having the same or similar functions throughout.

[0021] Furthermore, the embodiments of this application described below in conjunction with the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting this application.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] Please see Figure 1 and Figure 2 This application discloses a highly stable constant-voltage brush device 100, comprising an outer cylinder 10, an inner cylinder 20, a brush rod 30, and an elastic element 40. The inner cylinder 20 is sleeved inside the outer cylinder 10, and a sealed inner cavity 11 is formed between the outer cylinder 10 and the inner cylinder 20. The outer cylinder 10 has an inlet 13 and an outlet 14 communicating with the inner cavity 11, and the inlet 13 and outlet 14 are used for circulating fluid medium for heat dissipation. The brush rod 30 is slidably installed inside the inner cylinder 20, and the elastic element 40 is disposed inside the inner cylinder 20. One end of the elastic element 40 abuts against the brush rod 30, and the other end abuts against the brush rod 30, for providing a constant axial clamping force to the brush rod 30.

[0024] This application utilizes the fluid circulation cavity 11 formed by the outer cylinder 10 and the inner cylinder 20 to achieve efficient heat dissipation between the elastic element 40 and the brush rod 30, avoiding high-temperature thermal degradation. The elastic element 40's elastic force drives the brush rod 30 to maintain constant pressure contact, significantly improving the stability of the brush pressure. The integrated structure, while reducing size, also possesses enhanced heat dissipation and pressure self-regulation functions, effectively reducing contact resistance and wear, and extending the service life of the device.

[0025] Specifically, the outer cylinder 10 is a cylindrical metal shell, and the inner cylinder 20 is coaxially sleeved inside the outer cylinder 10, forming an annular inner cavity 11 between them. An inlet 13 and an outlet 14 are provided on the side wall of the outer cylinder 10, respectively connected to an external circulation pump (not shown) to inject cooling water or oil. An mounting cylinder 12 is located at the middle of one end of the outer cylinder 10, and the inner wall of the mounting cylinder 12 is threaded.

[0026] Furthermore, the inlet 13 is located on the side wall of the outer cylinder 10 near the pressing end of the brush rod 30, and the outlet 14 is located on the other side of the outer cylinder 10 at a diagonal position, with the central axis of the inlet 13 and outlet 14 forming an angle of 180°. The diagonal layout forms a spiral flow channel for the fluid inside the inner cavity 11, improving heat dissipation efficiency; the pressing end is cooled first, specifically reducing the temperature of the highest temperature area.

[0027] The inner cylinder 20 includes a front cylinder 21 and a rear cylinder 22 coaxially connected, both with the same wall thickness. The inner diameter of the front cylinder 21 is smaller than that of the rear cylinder 22. Both the inner and outer sides of the inner cylinder 20 form stepped limiting structures. The outer wall of the front cylinder 21 is threaded to match the inner wall of the mounting cylinder 12, and the outer cylinder 10 and the inner cylinder 20 are tightened together via these threads. The threaded connection facilitates the disassembly and maintenance of the inner cylinder 20, while also enhancing the connection rigidity between the outer cylinder 10 and the front cylinder 21, preventing loosening.

[0028] Furthermore, please combine Figure 3 and Figure 4 The end of the rear cylinder 22 is sealed to the inner wall of the outer cylinder 10 via a sealing gasket 23. A sealing ring 24 is provided at the connection between the front cylinder 21 and the rear cylinder 22, and the sealing ring 24 is clamped between the end of the mounting cylinder 12 and the outer wall of the rear cylinder 22. The sealing gasket 23 and the sealing ring 24 are made of polytetrafluoroethylene. Together, they seal the inner cavity 11, prevent fluid leakage from the inner cavity 11, buffer the assembly stress between the outer cylinder 10 and the inner cylinder 20, improve shock resistance, and protect the brush rod 30 and the spring from corrosion.

[0029] The brush rod 30 is cylindrical and can be slidably installed in the inner cylinder 20. A radially protruding retaining ring 31 is integrally formed on the outer periphery of the brush rod 30, and the outer diameter of the retaining ring 31 matches the inner wall of the rear cylinder 22. The stepped cylinder structure of the inner cylinder 20 restricts the displacement range of the brush rod 30 to prevent loosening. Simultaneously, the retaining ring 31 cooperates with the rear cylinder 22 to guide the brush rod 30, ensuring linear movement and preventing uneven wear. The pressing end of the brush rod 30 abuts against the outer surface of the collector ring, and its curvature matches the direction of the collector ring. A groove 32 is formed laterally on the free end of the brush rod 30, and the terminal of the connecting wire 33 is clamped by an elastic buckle 34, which matches the groove 32. The elastic buckle prevents thermal deformation of the brush rod 30 caused by welding, ensuring electrical conductivity stability.

[0030] The elastic element 40 is a helical spring, installed inside the rear cylinder 22 and sleeved on the outside of the brush rod 30, with its two ends abutting against the inner surfaces of the retaining ring 31 and the end face of the outer cylinder 10, respectively. The coaxial design of the spring ensures even distribution of the elastic force, avoiding one-sided wear. The spring provides a constant axial force to the brush rod 30, ensuring stable contact pressure between the brush rod 30 and the slip ring, reducing arcing and wear.

[0031] In some embodiments, the inner cylinder 20 has a stepped cylinder structure, with the front cylinder 21 and the rear cylinder 22 coaxially connected; the outer periphery of the brush rod 30 is provided with a radially protruding retaining ring 31, which slides with the inner wall of the rear cylinder 22, and the elastic element 40 abuts between the retaining ring 31 and the end of the rear cylinder 22.

[0032] This application also provides a generator 500, including a slip ring 51, a brush holder 52, and the aforementioned brush assembly 100. An outer cylinder 10 is fixed to the brush holder 52, and the pressing end of the brush rod 30 elastically abuts against the outer surface of the slip ring 51. The slip ring 51 on the generator 50's rotating shaft contacts the pressing end of the brush rod 30. The outer cylinder 10 is fixed to the brush holder 52 by flange bolts. Circulating water is introduced into the inner cavity 11, with a water flow velocity of 0.5 m / s and a flow rate of 5 L / min.

[0033] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the stated features. In the description of this application, "multiple" means at least two, such as two or three, unless otherwise explicitly specified.

[0035] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-stability constant voltage brush device, characterized in that, include: outer cylinder; The inner cylinder is fitted inside the outer cylinder, and a sealed inner cavity is formed between the outer cylinder and the inner cylinder. The outer cylinder has an inlet and an outlet that communicate with the inner cavity. The inlet and outlet are used to circulate fluid medium for heat dissipation. A brush rod, which is slidably mounted inside the inner cylinder; And an elastic element, which is disposed inside the inner cylinder, with one end of the elastic element abutting against the brush rod and the other end abutting against the brush rod, for providing a constant axial clamping force to the brush rod.

2. The brush device according to claim 1, characterized in that, The inner cylinder has a stepped cylinder structure, with a front cylinder and a rear cylinder coaxially connected. The inner diameter of the front cylinder is smaller than that of the rear cylinder. The outer periphery of the brush rod is provided with a radially protruding retaining ring, which slides in conjunction with the inner wall of the rear cylinder. The elastic element abuts against the end of the retaining ring and the rear cylinder.

3. The brush device according to claim 2, characterized in that, The elastic element is a spring, which is located inside the rear cylinder and sleeved on the outside of the brush rod. The two ends of the spring abut against the retaining ring and the outer cylinder, respectively.

4. The brush device according to claim 2, characterized in that, The end of the rear cylinder is sealed to the inner wall of the outer cylinder via a sealing gasket.

5. The brush device according to claim 2, characterized in that, The outer cylinder is provided with an installation cylinder, and the inner wall of the installation cylinder is connected to the outer wall of the front cylinder by a thread.

6. The brush device according to claim 5, characterized in that, A sealing ring is provided at the connection between the front cylinder and the rear cylinder, and the sealing ring is clamped between the end of the mounting cylinder and the outer wall of the rear cylinder.

7. The brush device according to claim 1, characterized in that, The inlet and outlet are diagonally distributed along the axial direction of the outer cylinder, and the inlet is located near the pressing end of the brush rod.

8. The brush device according to claim 1, characterized in that, The brush device also includes a connecting wire, one end of which is snapped into one end of the brush rod.

9. A generator, comprising slip rings and brush holder, characterized in that, It also includes the brush device as described in any one of claims 1-8, wherein the outer cylinder is fixed to the brush holder, and the pressing end of the brush rod elastically abuts against the outer surface of the slip ring.

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