Collecting ring device of self-cooling water turbine generator

Abstract

A collector ring device of a self-cooling water turbine generator comprises a storage cavity and a circulation cavity which are arranged in a collector ring, the storage cavity is close to the inner side of the collector ring, and the circulation cavity is close to the outer side of the collector ring; the storage cavity is communicated with the circulating cavity through a communicating cavity; a heat dissipation pipe is arranged between the storage cavity and the circulation cavity and located on the outer side of the collecting ring. A one-way valve is installed on the heat dissipation pipe, and liquid flows from the circulation cavity to the storage cavity in a one-way mode. The collector ring device of the self-cooling water turbine generator provided by the utility model can effectively cool the collector ring.

Description

Technical Field

[0001] The utility model relates to a water turbine generator, in particular to a collector ring device of a self-cooling water turbine generator. Background Art

[0002] With the development of the power system and the continuous increase in the capacity of single turbine generators, the excitation current required for a single unit is increasing, and the requirements for the stability and reliability of the generator slip ring device are getting higher and higher. The collector ring is an important component of the slip ring device. It has been the focus and difficulty of the overhaul and maintenance of large-scale hydro-turbine generators over the years. The number and frequency of its defects are much higher than other equipment. The collector ring overheating and slip ring sparking are its main defects. At present, the main way of heat dissipation of the collector ring device is natural air cooling. After the installation of the carbon powder absorption device, the heat dissipation environment of the collector ring is worse. The temperature of the collector ring of some units can reach above 120℃ in summer, which will cause the carbon brush to overheat, expand and jam, and spark. At the same time, it will damage the collector ring oxide film and even ablate the collector ring surface, causing equipment failure.

[0003] Defects and shortcomings of the existing technology:

[0004] 1) If the collector ring relies solely on natural heat dissipation, the collector ring temperature will rise above the limit;

[0005] 2) Installing a collector ring ventilation fan will make it difficult to collect carbon powder, which will fall onto the insulating parts of the slip ring device, causing carbon powder accumulation and even forming a discharge channel between the collector ring electrodes, posing a safety hazard. Summary of the invention

[0006] The technical problem to be solved by the utility model is to provide a self-cooling water turbine generator collector ring device, which can control the collector ring temperature below the limit value.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A self-cooling water turbine generator collector ring device comprises a storage chamber and a circulation chamber arranged in the collector ring, wherein the storage chamber is close to the inner side of the collector ring and the circulation chamber is close to the outer side of the collector ring; the storage chamber and the circulation chamber are connected through a connecting chamber; a heat dissipation pipe is arranged between the storage chamber and the circulation chamber, and the heat dissipation pipe is located on the outer side of the collector ring; a one-way valve is installed on the heat dissipation pipe, and liquid flows unidirectionally from the circulation chamber to the storage chamber.

[0009] The storage cavity and the circulation cavity are both annular.

[0010] The communicating cavities and the heat dissipation pipes are in multiple groups and distributed circumferentially.

[0011] The utility model provides a self-cooling hydraulic generator collector ring device, which has the following technical effects:

[0012] 1) This device cools the collector ring by liquid cooling to improve the cooling efficiency.

[0013] 2) This device uses the movement characteristics of the collector ring itself to perform heat dissipation circulation, and does not require a coolant pump.

[0014] 3) This device reduces the collector ring temperature, reduces carbon brush sparking, and is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0016] Figure 1 It is a top view of the utility model.

[0017] Figure 2 It is a partial cross-sectional view of the utility model.

[0018] In the figure: a collector ring 1, a collector ring bracket 2, an insulating screw 3, an insulating gasket 4, a storage chamber 5, a circulation chamber 6, a connecting chamber 7, a heat dissipation pipe 8, a liquid injection and discharge hole 9, and a one-way valve 10. DETAILED DESCRIPTION

[0019] like Figure 1-2 As shown, the collector ring 1 is an interface device for inputting the excitation current of the generator from the stationary part to the rotating part. The collector ring bracket 2 is nested on the main shaft of the generator to support the collector ring device. The insulating screw 3 and the insulating washer 4 insulate the collector ring 1 from the collector ring bracket 2.

[0020] A self-cooling water turbine generator collector ring device includes a storage chamber 5 and a circulation chamber 6 arranged in a collector ring 1, wherein the storage chamber 5 and the circulation chamber 6 are both annular and concentric with the collector ring 1. The storage chamber 5 is close to the inner wall of the collector ring 1, and the circulation chamber 6 is close to the outer wall of the storage chamber 5. The storage chamber 5 and the circulation chamber 6 are connected through a connecting chamber 7.

[0021] In addition, in order to achieve the purpose of heat dissipation, a heat dissipation pipe 8 is connected between the storage chamber 5 and the circulation chamber 6. The heat dissipation pipe 8 is located outside the collector ring 1 and exposed to the air. A one-way valve 10 is installed on the heat dissipation pipe 8, and the one-way valve 10 allows liquid to flow from the circulation chamber 6 to the storage chamber 5.

[0022] Preferably, a liquid filling and draining hole 9 is also installed on the heat dissipation tube 8. The liquid filling and draining hole 9 is sealed by a cover in a normal state, and is filled when the coolant needs to be supplemented or emptied when the coolant needs to be replaced.

[0023] Working principle and process: When the collector ring 1 is not in operation, due to the principle of connection, the liquids in the storage chamber 5 and the circulation chamber 6 are level; when the collector ring 1 is in operation, the coolant in the storage chamber 5 enters the circulation chamber 6 through the connecting chamber 7 under the action of centrifugal force. Since the circulation chamber 6 is close to the collector ring surface and the collector ring surface temperature is high, the coolant heats up and expands, and flows into the heat dissipation tube 8. The coolant exchanges heat to the air in the heat dissipation tube 8. At the same time, due to the action of the one-way valve 10, the coolant can only flow from the heat dissipation tube 8 to the storage chamber 5, thus ensuring the one-way circulation of the coolant in the storage chamber 5 and the circulation chamber 6.

Claims

1. A self-cooling hydraulic generator collector ring device, characterized in that: The invention comprises a storage chamber (5) and a circulation chamber (6) arranged in a collector ring (1), wherein the storage chamber (5) is close to the inner side of the collector ring (1), and the circulation chamber (6) is close to the outer side of the collector ring (1); the storage chamber (5) and the circulation chamber (6) are connected via a communication chamber (7); a heat dissipation pipe (8) is arranged between the storage chamber (5) and the circulation chamber (6), and the heat dissipation pipe (8) is located on the outer side of the collector ring (1); a one-way valve (10) is installed on the heat dissipation pipe (8), and liquid flows from the circulation chamber (6) to the storage chamber (5) in one direction.

2. A self-cooling hydraulic generator collector ring device according to claim 1, characterized in that: The storage chamber (5) and the circulation chamber (6) are both annular.

3. A self-cooling hydraulic generator collector ring device according to claim 2, characterized in that: The communicating cavities (7) and the heat dissipation pipes (8) are in multiple groups and are distributed circumferentially.

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