Carbon brush collector ring structure with heat dissipation fins

Abstract

The invention relates to the technical field of motor heat dissipation, in particular to a carbon brush collector ring structure with heat dissipation fins, which comprises a hood and a main shaft body which is arranged in the hood and is driven by water flow to rotate, the main shaft body is sleeved with a collector ring supporting table, a collector ring group and a heat dissipation fin group are fixed on the collector ring supporting table, and the heat dissipation fins are fixed on the collector ring group. The heat dissipation fin group is provided with heat dissipation fins which are annularly arranged; a conducting ring group is fixed in the hood, the collecting ring group is arranged in the conducting ring group, and a carbon brush in contact with the collecting ring group is arranged on the conducting ring group. When the heat dissipation fins rotate, heat of the collector ring group is better conducted to air, convection heat dissipation of the heat dissipation fin group is further strengthened, and meanwhile, the safe distance between electrodes can be increased, the air flow can be increased, and convection heat dissipation can be strengthened due to the fact that the conducting rings are inversely arranged. According to the invention, the heat dissipation area and the heat dissipation coefficient of the carbon brush-collecting ring group are indirectly increased, so that the safe and stable operation of the excitation system of the water-turbine generator set is ensured.

Description

Technical Field

[0001] This invention relates to the field of motor heat dissipation technology, specifically to a carbon brush slip ring structure with integrated heat dissipation fins. Background Technology

[0002] The carbon brush-slip ring system is a crucial component of the hydro-generator excitation system. The excitation cable delivers the excitation current to the conductive rings, which then transmit it to the carbon brushes. From there, the current is transferred to the slip rings, and finally, the slip rings transmit the current to the stator and rotor via the shaft leads for induction power generation. Therefore, the operating condition of the carbon brushes and slip rings directly affects the normal operation of the entire excitation system. If the resistance heat generated by the large current flowing through the friction surfaces of the carbon brushes and slip rings, as well as the frictional heat generated between them, cannot be effectively eliminated, overheating of the carbon brush-slip ring system will occur. Overheating can damage the slip ring surface, leading to poor local contact, further affecting the contact between the carbon brush and slip ring, resulting in abnormal wear, sparking, burning, and even generator shutdown.

[0003] Therefore, in the field of hydropower generation, where safety requirements are high, research on how to effectively remove the heat generated during the operation of carbon brush-collector rings is of great theoretical and practical significance for ensuring the safe, reliable, and stable operation of the unit. Summary of the Invention

[0004] The purpose of this invention is to provide a carbon brush collector ring structure with integrated heat dissipation fins.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention proposes a carbon brush collector ring structure with integrated heat dissipation fins, including a housing and a main shaft body that rotates within the housing driven by water flow. A collector ring support platform is sleeved on the main shaft body, and a collector ring assembly and a heat dissipation fin assembly are fixed on the collector ring support platform. The heat dissipation fin assembly has heat dissipation fins arranged in a ring shape. A conductive ring assembly is fixed inside the housing, and the collector ring assembly is located within the conductive ring assembly. A carbon brush is disposed on the conductive ring assembly that contacts the collector ring assembly.

[0007] Furthermore, a collector ring support column is fixed on the collector ring support platform, the collector ring support column supports the collector ring assembly, and an insulating washer is fitted on the bottom of the collector ring support column to isolate the collector ring support column from the collector ring support platform. The collector ring assembly includes an upper collector ring and a lower collector ring, and an insulating sleeve is fitted on the collector ring support column to separate the upper collector ring and the lower collector ring.

[0008] Furthermore, the heat dissipation fin assembly includes an upper heat dissipation fin ring located above the upper collector ring and a lower heat dissipation fin ring located between the upper collector ring and the lower collector ring; the heat dissipation fins of the upper heat dissipation fin ring and the lower heat dissipation fin ring are inclined at an angle.

[0009] Furthermore, a flat keyway is provided on the side wall of the main shaft body, and a connecting hole that mates with the flat keyway is provided on the slip ring support platform. The flat keyway and the connecting hole are connected by a flat key.

[0010] Furthermore, the conductive ring assembly includes an upper conductive ring and a lower conductive ring, and a conductive ring support for inserting and fixing the conductive ring assembly is welded inside the housing; a carbon brush box for mounting the carbon brush is provided on the conductive ring assembly.

[0011] Furthermore, the carbon brush box is disposed on the lower surface of the upper conductive ring and the upper surface of the lower conductive ring.

[0012] Furthermore, the carbon brush is fixed inside the carbon brush holder by a constant pressure spring.

[0013] Compared with existing technologies, this invention changes the traditional slip ring bracket to a support platform structure and alters the installation method of the conductive rings. It adds a heat dissipation fin assembly to the slip ring group. The inclined structure of the heat dissipation fins increases the heat dissipation area, and during rotation, it better conducts heat from the slip ring group into the air, further enhancing convective heat dissipation. Simultaneously, the inverted installation of the conductive rings increases the safety distance between electrodes, increases airflow, and enhances convective heat dissipation. This invention indirectly increases the heat dissipation area and heat dissipation coefficient of the carbon brush-slip ring assembly, thereby ensuring the safe and stable operation of the hydro-generator excitation system. Attached Figure Description

[0014] Figure 1 This is an exploded view of the overall structure of the present invention.

[0015] Figure 2 Assembly view of the overall structure of the present invention

[0016] Figure 3 This is a partial exploded structural diagram of the present invention.

[0017] Figure 4 This is a partial exploded structural diagram of the present invention.

[0018] Figure 5 This is a schematic diagram of the heat dissipation fin ring structure of the present invention.

[0019] Figure 6 This is a schematic diagram of the collector ring structure of the present invention.

[0020] Figure 7 This is a partial structural diagram of the present invention.

[0021] Figure 8 This is a schematic diagram of the conductive ring assembly structure of the present invention.

[0022] In the diagram, 1-spindle body; 10-keyway; 11-key; 2-slip ring support; 20-connecting hole; 21-slip ring support; 22-nut; 3-slip ring assembly; 31-lower slip ring; 32-upper slip ring; 33-insulating washer; 34-insulating sleeve; 4-heat sink fin assembly; 41-lower heat sink fin ring; 42-upper heat sink fin ring; 43-mounting slot; 44-heat sink fin; 5-conductive ring assembly; 51-lower conductive ring; 52-upper conductive ring; 53-conductive ring through hole; 54-conductive ring support; 6-machine cover; 7-carbon brush box; 8-carbon brush. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0024] In one embodiment of the present invention, a carbon brush collector ring structure with integrated heat dissipation fins includes a housing 6 and a main shaft 1 that rotates within the housing 6 driven by water flow. A collector ring support platform 2 is sleeved on the main shaft 1. A collector ring assembly 3 and a heat dissipation fin assembly 4 are fixed on the collector ring support platform 2. The heat dissipation fin assembly 4 has heat dissipation fins 44 arranged in a ring shape. A conductive ring assembly 5 is fixed inside the housing 6. The collector ring assembly 3 is inside the conductive ring assembly 5, and a carbon brush 8 is disposed on the conductive ring assembly 5 that contacts the collector ring assembly 3.

[0025] In practical applications, the spindle body 1 is driven by water flow, which drives the slip ring support platform 2 to rotate. In turn, the slip ring support platform 2 drives the slip ring assembly 3 and the heat dissipation fin assembly 4 on the slip ring support platform 2 to rotate. During the rotation, the heat dissipation fins 44 of the heat dissipation fin assembly drive the cooling air upward through the heat dissipation fins 44. The heat is transferred from the carbon brush 8 to the slip ring assembly 3 to the heat dissipation fin assembly 4, and finally transferred to the cooling air through the heat dissipation fins 44.

[0026] In one embodiment of the present invention, the carbon brush 8 is arranged in a circumferential manner on the conductive ring group 5 to facilitate heat dissipation.

[0027] In one embodiment of the present invention, a collector ring support column 21 is fixed on the collector ring support platform 2, the collector ring support column 21 supports the collector ring assembly 3, and an insulating washer 33 is sleeved on the bottom of the collector ring support column 21 to isolate the collector ring support column 21 from the collector ring support platform 2. The collector ring assembly 3 includes an upper collector ring 32 and a lower collector ring 31. An insulating sleeve 34 is sleeved on the collector ring support column 21 to separate the upper collector ring 32 and the lower collector ring 31. There is a certain distance between the upper and lower collector rings and an insulating sleeve is provided to ensure air intake and insulation.

[0028] In the above embodiment, the heat dissipation fin group 4 includes an upper heat dissipation fin ring 42 located above the upper collector ring 32 and a lower heat dissipation fin ring 41 located between the upper collector ring 32 and the lower collector ring 31; the heat dissipation fins 44 of the upper heat dissipation fin ring 42 and the lower heat dissipation fin ring 41 are inclined at an angle; each heat dissipation fin ring (41 / 42) has 144 heat dissipation fins 44; during rotation, the heat dissipation fins 44 cut and drive the cooling air upward through the surface of the heat dissipation fins 44, and the heat is transferred from the carbon brush 8-collector ring group 3 to the heat dissipation fin group 4, and finally transferred to the cooling air through the heat dissipation fins 44.

[0029] In the above embodiment, the heat dissipation fin assembly 4 has a mounting slot 43. The heat dissipation fin assembly 4 is sleeved and fixed on the collector ring assembly 3 through the collector ring support 21 and the mounting slot 43, and rotates with the collector ring assembly 3.

[0030] In one embodiment of the present invention, six collector ring support columns 21 are evenly arranged on the collector ring support platform 2 to ensure the stability and reliability of the collector ring assembly 3 and the heat dissipation fin assembly 4 on the collector ring support columns 21.

[0031] In one embodiment of the present invention, a flat keyway 10 is provided on the side wall of the main spindle body 1, and a connecting hole 20 that mates with the flat keyway 10 is provided on the slip ring support 2. The flat keyway 10 and the connecting hole 20 are connected by a flat key 11.

[0032] In the above embodiment, the main spindle body 1 is a stepped shaft, and there are at least two flat keyways 10, which are symmetrically arranged to ensure that the slip ring support 2 and the main spindle body 1 will not move relative to each other.

[0033] In one embodiment of the present invention, the conductive ring assembly 5 includes an upper conductive ring 52 and a lower conductive ring 51. A conductive ring support 54 for inserting and fixing the conductive ring assembly 5 is welded inside the housing 6. A carbon brush box 7 for mounting the carbon brush 8 is provided on the conductive ring assembly 5. The conductive ring assembly 5 has several conductive ring through holes 53 symmetrically opened around its circumference for fixing with the conductive ring support 54. An insulating component is provided on the conductive ring support 54 to separate the upper and lower conductive rings, increase the interstage spacing, and ensure the safe operation of the excitation system. Some space is left on the conductive rings to facilitate the installation and use of subsequent excitation cables, more carbon brushes, and monitoring components.

[0034] In the above embodiment, the carbon brush box 7 is arranged circumferentially on the lower surface of the upper conductive ring 52 and the upper surface of the lower conductive ring 51.

[0035] In the above embodiment, the upper conductive ring 52 is inverted and the lower conductive ring is installed normally to increase the safety distance between stages and increase the airflow in the collector ring group 3 to enhance convective heat dissipation.

[0036] In the above embodiment, the carbon brush 8 is fixed in the carbon brush box 7 by a constant pressure spring (a conventional technique in the art, not specifically shown in the figure); ensuring contact between the carbon brush 8 and the slip ring assembly 3.

[0037] In one embodiment of the present invention, the carbon brush 8 has a size of 25×32×60mm.

[0038] Working principle: The rotation of the spindle shaft drives the slip ring support, slip ring assembly, and heat sink assembly to rotate. Cooling air flows from bottom to top through the heat sink fins, thereby carrying away the heat from the carbon brush and slip ring.

[0039] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the invention. Modifications and variations made by those skilled in the art in accordance with the spirit of the invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A carbon brush collector ring structure with integrated heat dissipation fins, characterized in that: The device includes a housing and a main shaft that rotates within the housing driven by water flow. A slip ring support is fitted onto the main shaft. A slip ring assembly and a heat dissipation fin assembly are fixed on the slip ring support. The heat dissipation fin assembly has heat dissipation fins arranged in a ring shape. A conductive ring assembly is fixed inside the housing. The slip ring assembly is located within the conductive ring assembly, and a carbon brush is provided on the conductive ring assembly that contacts the slip ring assembly.

2. The carbon brush collector ring structure with integrated heat dissipation fins according to claim 1, characterized in that: A collector ring support column is fixed on the collector ring support platform. The collector ring support column supports the collector ring assembly. An insulating washer is fitted on the bottom of the collector ring support column to isolate the collector ring support column from the collector ring support platform. The collector ring assembly includes an upper collector ring and a lower collector ring. An insulating sleeve is fitted on the collector ring support column to separate the upper collector ring and the lower collector ring.

3. The carbon brush collector ring structure with integrated heat dissipation fins according to claim 2, characterized in that: The heat dissipation fin assembly includes an upper heat dissipation fin ring located above the upper collector ring and a lower heat dissipation fin ring located between the upper collector ring and the lower collector ring; the heat dissipation fins of the upper heat dissipation fin ring and the lower heat dissipation fin ring are inclined at an angle.

4. The carbon brush collector ring structure with integrated heat dissipation fins according to claim 1, characterized in that: A flat keyway is provided on the side wall of the main shaft body, and a connecting hole that mates with the flat keyway is provided on the slip ring support platform. The flat keyway and the connecting hole are connected by a flat key.

5. The carbon brush collector ring structure with integrated heat dissipation fins according to claim 1, characterized in that: The conductive ring assembly includes an upper conductive ring and a lower conductive ring. A conductive ring support column for inserting and fixing the conductive ring assembly is welded inside the housing. A carbon brush box for mounting the carbon brush is provided on the conductive ring assembly.

6. The carbon brush collector ring structure with integrated heat dissipation fins according to claim 5, characterized in that: The carbon brush box is disposed on the lower surface of the upper conductive ring and the upper surface of the lower conductive ring.

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