Cooling structure of rotor slip ring of large steam turbine generator

Abstract

The utility model discloses a cooling structure of a rotor slip ring of a large steam turbine generator, which comprises the slip ring, a plurality of axially arranged through holes are uniformly and annularly arranged around the axis of the slip ring, a plurality of air deflectors are arranged on the end face of one side of the slip ring at intervals, and the air deflectors correspond to the through holes. And when the generator rotor drives the slip ring to rotate, the wind deflector faces the wind and guides airflow into the through hole. By arranging the through hole and the air deflector on the slip ring, when the rotor drives the slip ring to rotate, the air deflector has an air gathering and guiding function, the air guiding amount of the through hole of the slip ring is enhanced, the cooling effect is improved, and heat generated by the slip ring and the carbon brush can be diffused out under the condition that the slip ring and the carbon brush are heated. Equipment shutdown caused by faults of the carbon brush and the slip ring is solved, normal work of the slip ring and the carbon brush is ensured, normal work of a generator is ensured, economic loss caused by shutdown is avoided, safety benefits are great, and the device is suitable for popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of generators, in particular to a cooling structure for a rotor slip ring of a large steam turbine generator. Background Art

[0002] The function of the generator rotor slip ring is to transmit the excitation DC to the rotor winding through the carbon brushes and slip rings. The sliding friction between the carbon brushes and the slip rings generates heat. When the slip rings and carbon brushes cause heat and sparks due to various reasons, the excitation current will be cut off and the generator will shut down in serious cases. For a million-kilowatt generator, the loss caused by one day of shutdown is huge. Therefore, ventilation and heat dissipation of the slip rings are very necessary. The cooling of the existing generator rotor slip rings relies on the structure of the slip rings themselves to dissipate heat, or relies on the wind wheel of the generator slip rings to draw air for cooling. There is a problem of poor cooling effect and frequent shutdown problems. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects, provide a cooling structure for the rotor slip ring of a large steam turbine generator, enhance the cooling effect of the slip ring, solve the equipment shutdown caused by carbon brush and slip ring failure, ensure the normal operation of the slip ring carbon brush, ensure the normal operation of the generator, avoid economic losses caused by shutdown, have great safety benefits, are suitable for promotion and use, and can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cooling structure for a large steam turbine generator rotor slip ring, comprising a slip ring, wherein the slip ring is evenly provided with a plurality of axially arranged through holes around its axis, and a plurality of air guide plates are arranged at intervals on one end surface of the slip ring, the air guide plates correspond to the through holes, and when the generator rotor drives the slip ring to rotate, the air guide plates face the wind and guide the airflow into the through holes.

[0005] Preferably, the wind guide plate is spoon-shaped, including a guide plate and a windward plate, the guide plate cross-section is arc-shaped, the guide plate axis is coaxial with the axis of the corresponding through hole, the windward plate faces the windward side, and the windward plate and the guide plate have an arc transition.

[0006] Preferably, the guide plate is further provided with a fixing plate, and the fixing plate is fixedly connected to the end surface of the slip ring via a locking screw.

[0007] Preferably, the air guide plate faces the tangent direction of the center of the circle where the corresponding through hole is located.

[0008] Preferably, the fixing plate, the guide plate and the windward plate are integrally formed.

[0009] Preferably, the number of the through holes is greater than or equal to the number of the air guide plates.

[0010] Compared with the prior art, the utility model has the following beneficial effects: a through hole is arranged on the slip ring, and an air guide plate is arranged on the side of the through hole; when the rotor drives the slip ring to rotate, the air guide plate has the function of gathering and guiding wind, thereby enhancing the air guide volume of the slip ring through hole and increasing the cooling effect; when the slip ring and the carbon brush generate heat, the heat generated by the slip ring and the carbon brush can also be diffused, thereby solving the equipment shutdown caused by the failure of the carbon brush and the slip ring, ensuring the normal operation of the slip ring carbon brush, ensuring the normal operation of the generator, avoiding the economic loss caused by the shutdown, having great safety benefits, and being suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0012] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0013] Figure 3 This is a schematic diagram of the wind deflector structure of the utility model;

[0014] Figure 4 for Figure 3 sectional view of .

[0015] In the figure: 1 slip ring, 1.1 through hole, 2 air guide plate, 2.1 fixing plate, 2.2 air guide plate, 2.3 windward plate, 2.4 locking screw. DETAILED DESCRIPTION

[0016] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0017] See also Figure 1-4 The utility model provides a technical solution: a cooling structure of a large steam turbine generator rotor slip ring, comprising a slip ring 1, wherein the slip ring 1 is evenly provided with a plurality of axially arranged through holes 1.1 around its axis, and a plurality of air guide plates 2 are arranged at intervals on one end surface of the slip ring 1, wherein the air guide plates 2 correspond to the through holes 1.1, and when the generator rotor drives the slip ring 1 to rotate, the air guide plates 2 face the wind and guide the airflow into the through holes 1.1;

[0018] A through hole 1.1 is arranged on the slip ring 1, and an air guide plate 2 is arranged on the side of the through hole 1.1. When the rotor drives the slip ring 1 to rotate, the air guide plate 2 has the function of gathering and guiding wind, thereby increasing the air flow of the through hole 1.1 of the slip ring 1, increasing the cooling effect, and diffusing the heat generated by the slip ring 1 and the carbon brush, thereby ensuring the normal operation of the slip ring carbon brush and the normal operation of the generator, and reducing the economic loss caused by downtime. The implementation difficulty is small, the investment is small, the operation is simple and reliable, the safety benefits are huge, and the safe operation of large steam turbine generators has a huge effect;

[0019] Specifically, the wind deflector 2 is spoon-shaped, including a deflector 2.2 and a windward plate 2.3. The cross section of the deflector 2.2 is arc-shaped. The axis of the deflector 2.2 is coaxial with the axis of the corresponding through hole 1.1. The windward plate 2.3 faces the windward side, and the windward plate 2.3 and the deflector 2.2 have an arc transition. The main function of the windward plate 2.3 is to face the wind and gather the wind and allow the airflow to pass through the deflector 2.2 into the through hole 1.1.

[0020] Furthermore, the guide plate 2.2 is also provided with a fixing plate 2.1, and the fixing plate 2.1 is fixedly connected to the end surface of the slip ring 1 by means of a locking screw 2.4, so as to facilitate disassembly and installation and facilitate later maintenance;

[0021] Furthermore, the air guide plate 2 is oriented toward the tangent direction of the center of the circle where the corresponding through hole 1.1 is located, ensuring the maximum amount of air collected;

[0022] Furthermore, the fixing plate 2.1, the guide plate 2.2 and the windward plate 2.3 are integrally formed and manufactured by using a mold sand casting;

[0023] In addition, the number of through holes 1.1 is greater than or equal to the number of air guide plates 2. Optimally, the number of through holes 1.1 is 1, 2 or 3 times the number of air guide plates 2. That is, the number of air guide plates 2 is determined according to the number of through holes 1.1 on the slip ring 1 to avoid interference between adjacent air guide plates 2 when there are too many air guide plates 2 and affecting the air volume, or affecting the cooling effect when there are too few air shields 2.

[0024] It should be noted that the slip ring 1 with the air guide plate 2 installed is dynamically balanced to ensure that it does not affect the balance of the generator rotor and cause vibration.

[0025] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended to include all changes that fall within the meaning and scope of equivalent elements in the content of the present invention.

Claims

1. A cooling structure for a large steam turbine generator rotor slip ring, comprising a slip ring (1), characterized in that: The slip ring (1) is evenly provided with a plurality of axially arranged through holes (1.1) around its axis, and a plurality of air guide plates (2) are spaced apart on one end surface of the slip ring (1), the air guide plates (2) corresponding to the through holes (1.1), and when the generator rotor drives the slip ring (1) to rotate, the air guide plates (2) face the wind and guide the airflow into the through holes (1.1).

2. The cooling structure of a large steam turbine generator rotor slip ring according to claim 1 is characterized in that: The wind deflector (2) is spoon-shaped and comprises a deflector (2.2) and a windward plate (2.3); the deflector (2.2) has an arc-shaped cross section; the axis of the deflector (2.2) is coaxial with the axis of the corresponding through hole (1.1); the windward plate (2.3) faces the windward side, and the windward plate (2.3) and the deflector (2.2) have an arc transition.

3. The cooling structure of a large steam turbine generator rotor slip ring according to claim 2 is characterized in that: The guide plate (2.2) is also provided with a fixing plate (2.1), and the fixing plate (2.1) is fixedly connected to the end face of the slip ring (1) via a locking screw (2.4).

4. The cooling structure of a large steam turbine generator rotor slip ring according to claim 2, characterized in that: The air guide plate (2) faces the tangent direction of the center of the circle where the corresponding through hole (1.1) is located.

5. The cooling structure of a large steam turbine generator rotor slip ring according to claim 3 is characterized in that: The fixing plate (2.1), the guide plate (2.2) and the windward plate (2.3) are integrally formed.

6. The cooling structure of a large steam turbine generator rotor slip ring according to claim 1, characterized in that: The number of the through holes (1.1) is greater than or equal to the number of the air guide plates (2).

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