Brush sealing type carbon brush collecting ring heat dissipation and dust exhaust device and working method

Abstract

The invention relates to the technical field of hydro-generators, in particular to a brush sealing type carbon brush collecting ring heat dissipation and dust exhaust device and a working method.The brush sealing type carbon brush collecting ring heat dissipation and dust exhaust device comprises a main shaft, the main shaft is sleeved with a collecting ring support, a collecting ring is fixed to the collecting ring support, and a conducting ring is arranged on the outer side of the collecting ring; the dust collector is characterized by further comprising a dust collection cover arranged between the conducting ring and the collecting ring, a plurality of carbon brushes which penetrate through the dust collection cover and are in contact with the collecting ring are arranged on the conducting ring, and air supply ports and air suction ports which are arranged in pairs are formed in the side wall of the dust collection cover. According to the invention, external airflow can enter the space between the dust collection cover and the collector ring from the air supply port, flows through the contact interface of the carbon brush and the collector ring and takes away heat and carbon powder, so that the synergistic effect of heat dissipation and dust discharge is realized without changing the main body structure of the existing carbon brush-collector ring, and the service life of the carbon brush-collector ring is prolonged. And the method has definite practical significance for ensuring the safe and stable operation of the carbon brush-collecting ring device.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator technology, specifically to a brush-sealed carbon brush collector ring heat dissipation and dust removal device and its working method. Background Technology

[0002] The carbon brush-slip ring assembly, a key component of the excitation system of a hydro-generator unit, is responsible for transmitting excitation current to the rotor windings. During operation, the carbon brushes and slip rings continuously slide in contact, inevitably generating heat and carbon dust. If this heat and carbon dust cannot be dissipated in time, it can lead to problems such as short circuits between the upper and lower rings, abnormal carbon brush wear, carbon brush overheating, sparking, and slip ring erosion. Currently, to reduce carbon dust contamination and heat accumulation, some carbon brush-slip ring assemblies collect heat and carbon dust by installing dust collection hoods on the outside of the slip rings and adding external fans to exhaust air. However, this type of structure only has a significant effect on heat and carbon dust near the exhaust port, easily causing overheating of carbon brushes further away from the exhaust port and creating carbon dust retention areas in their vicinity.

[0003] Therefore, to address the above issues, it is necessary to design a new type of carbon brush-slip ring heat dissipation and dust removal device. This device can cover each carbon brush to fully remove heat and carbon dust, ensuring the safe and reliable operation of the carbon brush-slip ring device. Summary of the Invention

[0004] The purpose of this invention is to provide a carbon brush-collector ring heat dissipation and dust removal device that can remove heat and toner.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention proposes a brush-sealed carbon brush collector ring heat dissipation and dust removal device, including a main shaft, a collector ring bracket sleeved on the main shaft, a collector ring fixed on the collector ring bracket, a conductive ring disposed on the outer side of the collector ring, and a dust collection cover disposed between the conductive ring and the collector ring. The conductive ring is provided with a plurality of carbon brushes that pass through the dust collection cover and contact the collector ring. The side wall of the dust collection cover is provided with paired air inlets and air outlets.

[0006] Furthermore, a brush is provided in the gap between the dust collection hood and the collector ring, and the brush is fixed on the dust collection hood.

[0007] Furthermore, the collector ring includes an upper collector ring and a lower collector ring, which are fixed to the collector ring bracket by a collector ring support screw, and an insulating element is provided between the collector ring support screw and the collector ring.

[0008] Furthermore, annular grooves are provided at the end faces of both the upper and lower collector rings, and an insulating baffle is provided between the upper and lower collector rings, the insulating baffle being positioned between the annular grooves on the opposite end faces of the upper and lower collector rings.

[0009] Furthermore, a plurality of brush holders are fixed on the conductive ring, the carbon brush is installed inside the brush holders, and the dust collection cover has an opening through which the brush holders pass.

[0010] Furthermore, the outer sidewalls of the collector ring are provided with spiral grooves.

[0011] Furthermore, there are two pairs of air intakes and air outlets, and the air intakes and air outlets are arranged alternately, with an air guide structure provided at the air outlet.

[0012] Furthermore, the air guiding structure is an air guiding block or air guiding plate with an angular cross-section, so that the air entering from the air outlet is blown to both sides.

[0013] The present invention also includes a method for operating the device, comprising the following steps: S1: Install the conductive ring on the shroud of the hydro-generator set, connect the air intake to the air intake device, and connect the air outlet to the air supply device. S2, start the hydro-generator set, the upper and lower collector rings rotate synchronously with the main shaft; start the air intake and air supply devices, the external airflow enters the dust collection hood and collector ring through the air supply device from the air outlet, under the action of the air guide structure, the airflow moves to both sides of the air outlet, forming 4 airflow paths from the air outlet to the air intake, and heat and carbon powder are drawn into the air intake device from the air intake.

[0014] Compared with the prior art, the present invention has alternating air inlets and outlets on the dust collection hood, and brushes are installed on the dust collection hood. At the same time, spiral grooves are opened on the outer ring surface of the collector ring, and insulating baffles are installed between the upper and lower collector rings. Under the combined effect of these designs, during the operation of the hydro-generator unit, external airflow can enter between the dust collection hood and the collector ring from the outlet, flow through the contact interface between the carbon brush and the collector ring, and carry away heat and carbon powder. Most of the airflow and the carbon powder carried by the airflow are sucked away at the nearest air inlet. Only a very small part of the airflow leaks from the brushes, and most of the carbon powder carried by this small part of the airflow is adsorbed by the brushes.

[0015] In addition, creating spiral grooves on the outer ring surface of the collector ring can not only promptly discharge worn carbon particles to the outside of the contact surface to reduce the probability of arcing, but also increase the heat dissipation area of ​​the collector ring.

[0016] This invention achieves a synergistic effect of heat dissipation and dust removal without changing the existing carbon brush-slip ring main structure, which has clear practical significance for ensuring the safe and stable operation of the carbon brush-slip ring device. Attached Figure Description

[0017] Figure 1 This is a diagram showing the overall airflow direction of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the dust collection hood. Figure 4 A schematic diagram of a local structure near the contact interface between the carbon brush and the slip ring; Figure 5 This is a schematic diagram of the conductive ring.

[0018] The components are: 1-Main shaft, 2-Collector ring bracket, 3-Upper collector ring, 3.1-Annular groove, 3.2-Spiral groove, 4-Dust collection hood, 4.1-Brush, 4.2-Air outlet, 4.3-Air guide structure, 4.4-Air intake, 4.5-Fourth threaded hole, 4.6-Third threaded hole, 4.7-Opening, 4.8-Groove, 5-Conductive ring, 5.1-First threaded hole, 5.2-Second threaded hole, 6-Collector ring support screw, 7-Brush holder, 8-Pipe, 9-Air supply device, 10-Air intake device, 11-Carbon brush, 12-Insulating baffle, 13-Lower collector ring, 14-Insulating component. Detailed Implementation

[0019] 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.

[0020] In this invention, the air supply device can be a centrifugal fan, blower, or other equipment capable of blowing out airflow; the air intake device can be an exhaust fan, negative pressure fan, industrial dust collector, or other equipment capable of sucking away airflow and carbon powder particles.

[0021] See Figures 1-3 In one embodiment of the present invention, a brush-sealed carbon brush collector ring heat dissipation and dust removal device includes a main shaft 1, a collector ring bracket 2 sleeved on the main shaft 1, a collector ring fixed on the collector ring bracket 2, a conductive ring 5 disposed on the outer side of the collector ring, and a dust collection cover 4 disposed between the conductive ring 5 and the collector ring. A plurality of carbon brushes 11 are disposed on the conductive ring 5, passing through the dust collection cover 4 and contacting the collector ring. The side wall of the dust collection cover 4 is provided with a pair of air inlets 4.2 and air inlets 4.4. In practical applications, the conductive ring 5 is installed on the shroud of the hydro-generator set, the air inlet 4.2 is connected to the air supply device 9, and the air intake 4.4 is connected to the air intake device 10. When the hydro-generator set is started, the slip ring will rotate synchronously with the main shaft 1. The airflow sent in from the air inlet 4.2 blows away the carbon powder and heat generated by the relative sliding of the carbon brush 11 and the slip ring, and sucks them away from the air intake 4.4.

[0022] In one embodiment of the present invention, the collector ring bracket 2 is connected to the main shaft 1 by a key connection (existing conventional technology, which will not be described in detail).

[0023] See Figure 2 and Figure 4 In one embodiment of the present invention, a brush 4.1 is provided in the gap between the dust collection hood 4 and the collector ring, and the brush 4.1 is fixed on the dust collection hood 4 to reduce airflow leakage from this gap.

[0024] See Figure 4 In the above embodiment, the dust collection hood 4 is annular, and the upper and lower ends extend inward to form grooves 4.8. The brush is set in the gap between the upper and lower ends of the collecting ring and the adjacent collecting ring. In actual application, the brush 4.1 slides in contact with the collecting ring. The semi-sealed effect here allows a small amount of airflow to pass through while adsorbing carbon powder, so that a smooth airflow channel is formed between the dust collection hood 4 and the collecting ring.

[0025] See Figure 4 In one embodiment of the present invention, the collector ring includes an upper collector ring 3 and a lower collector ring 13. The upper collector ring 3 and the lower collector ring 13 are fixed on the collector ring bracket 2 by a collector ring support screw 6. An insulating element 14 is provided between the collector ring support screw 6 and the collector ring to isolate the contact and current conduction between the collector ring support screw 6 and the collector ring.

[0026] Please continue reading. Figure 4 In the above embodiment, annular grooves 3.1 are provided at the end faces of both the upper collector ring 3 and the lower collector ring 13, and an insulating baffle 12 is provided between the upper collector ring 3 and the lower collector ring 13. The insulating baffle 12 is positioned between the annular grooves 3.1 on the opposite end faces of the upper collector ring 3 and the lower collector ring 13 to prevent airflow from leaking between the upper collector ring and the lower collector ring, and at the same time to prevent toner from entering between the upper collector ring and the lower collector ring and thus affecting the insulation.

[0027] See Figure 3 and Figure 4 In one embodiment of the present invention, a plurality of brush holders 7 are fixed on the conductive ring 5, the carbon brush 11 is installed in the brush holders 7, and the dust collection cover 4 has an opening 4.7 through which the brush holders 7 pass.

[0028] See Figure 3 and Figure 5 In the above embodiment, the conductive ring 5 is provided with a first threaded hole 5.1 for fixing the brush holder 7 and a second threaded hole 5.2 for fixing the dust collection cover 4; the outer surface of the dust collection cover 4 extends with a plurality of protrusions, and the protrusions are provided with a third threaded hole 4.6 that cooperates with the second threaded hole for fixing; the brush holder 7 and the dust collection cover 4 are both fixed to the conductive ring 5 by bolts.

[0029] See Figure 4 In one embodiment of the present invention, the outer side wall of the collector ring is provided with spiral grooves 3.2; this allows the worn carbon particles to be discharged to the outside of the contact surface in a timely manner, reducing the probability of arcing, and also increasing the heat dissipation area of ​​the collector ring.

[0030] See Figure 1 and Figure 2 In one embodiment of the present invention, there are two pairs of air intake vents 4.4 and air supply vents 4.2, and the air intake vents 4.4 and air supply vents 4.2 are arranged alternately, see reference. Figure 3 An air guide structure 4.3 is provided at the air outlet 4.2. In actual application, the airflow is blown in from the air outlet 4.2 and moves to both sides, forming 4 airflow paths from the air outlet 4.2 to the air intake 4.4, which draw away heat and toner from the air intake 4.4.

[0031] See Figure 3 In the above embodiments, the air guiding structure 4.3 is an air guiding block or air guiding plate with an angular cross section, so that the air entering the air outlet 4.2 blows to both sides.

[0032] In one embodiment of the present invention, the method of operating the device of the present invention includes the following steps: S1: Install the conductive ring 5 on the shroud of the hydro-generator set, and connect the air intake 4.4 and the air outlet 4.2 to the air intake device 10 and the air outlet 9 respectively through the pipe 8; S2, start the water turbine generator set, the upper collector ring 3 and the lower collector ring 13 rotate synchronously with the main shaft 1; start the air intake device 10 and the air supply device 9, the external airflow enters the dust collection hood 4 and the collector ring through the air supply device 9 from the air supply port 4.2, under the action of the air guide structure 4.3, the airflow moves to both sides of the air supply port 4.2, forming 4 airflow paths from the air supply port 4.2 to the air intake port 4.4, and the heat and carbon powder are drawn into the air intake device 10 from the air intake port 4.4; Under the combined action of the brush 4.1 and the insulating baffle 12, the external airflow enters from the air outlet 4.2 between the dust collection hood 4 and the collector ring, flows through the contact interface between the carbon brush 7 and the collector ring, and carries away heat and carbon powder. Most of the airflow is drawn in by the nearest air intake 4.4, and the carbon powder carried by the airflow is drawn into the air intake device 10. Only a very small part of the airflow leaks from the brush 4.1, and most of the carbon powder carried by this small part of the airflow is adsorbed by the brush.

[0033] See Figure 3 In the above embodiment, the air intake 4.4 and the air outlet 4.2 are both provided with a fourth threaded hole 4.5 for connecting the pipe 8 on their periphery.

[0034] 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 brush-sealed carbon brush slip ring heat dissipation and dust removal device, comprising a main shaft, a slip ring bracket sleeved on the main shaft, a slip ring fixed on the slip ring bracket, and a conductive ring disposed on the outer side of the slip ring, characterized in that: It also includes a dust collection hood disposed between the conductive ring and the collecting ring. The conductive ring is provided with a number of carbon brushes that pass through the dust collection hood and are in contact with the collecting ring. The side wall of the dust collection hood is provided with a pair of air supply ports and air intake ports.

2. The brush-sealed carbon brush collector ring heat dissipation and dust removal device according to claim 1, characterized in that: A brush is provided in the gap between the dust collection hood and the collector ring, and the brush is fixed on the dust collection hood.

3. The brush-sealed carbon brush collector ring heat dissipation and dust removal device according to claim 1, characterized in that: The collector ring includes an upper collector ring and a lower collector ring, which are fixed to the collector ring bracket by a collector ring support screw. An insulating element is provided between the collector ring support screw and the collector ring.

4. The brush-sealed carbon brush collector ring heat dissipation and dust removal device according to claim 3, characterized in that: Both the upper and lower collector rings have annular grooves on their end faces, and an insulating baffle is provided between the upper and lower collector rings, with the insulating baffle positioned between the annular grooves on the opposite end faces of the upper and lower collector rings.

5. The brush-sealed carbon brush collector ring heat dissipation and dust removal device according to claim 1, characterized in that: A plurality of brush holders are fixed on the conductive ring, the carbon brush is installed inside the brush holders, and the dust collection hood has an opening through which the brush holders pass.

6. The brush-sealed carbon brush collector ring heat dissipation and dust removal device according to claim 1, characterized in that: The outer side wall of each collector ring is provided with a spiral groove.

7. The brush-sealed carbon brush collector ring heat dissipation and dust removal device according to claim 1, characterized in that: There are two pairs of air intakes and air outlets, and the air intakes and air outlets are arranged alternately. An air guide structure is provided at the air outlet.

8. The brush-sealed carbon brush collector ring heat dissipation and dust removal device according to claim 7, characterized in that: The air guiding structure is an air guiding block or air guiding plate with an angular cross-section, which directs the air entering from the air outlet to both sides.

9. The method of operating the apparatus as described in claim 7, characterized in that, Includes the following steps: S1: Install the conductive ring on the shroud of the hydro-generator set, connect the air intake to the air intake device, and connect the air outlet to the air supply device. S2, start the hydro-generator set, the upper and lower collector rings rotate synchronously with the main shaft; start the air intake and air supply devices, the external airflow enters the dust collection hood and collector ring through the air supply device from the air outlet, under the action of the air guide structure, the airflow moves to both sides of the air outlet, forming 4 airflow paths from the air outlet to the air intake, and heat and carbon powder are drawn into the air intake device from the air intake.

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