Welding and cooling device for stator bars

Abstract

The utility model provides a kind of welding cooling device of stator bar, including clamp and air cooling clamping monomer, two air cooling clamping monomers are placed axially symmetrical and constitute air cooling clamp, two ends of air cooling clamp are clamped by clamp, the inside of air cooling clamping monomer is equipped with several ventilation grooves and two horizontal air ducts, and the side of air cooling clamping monomer is equipped with first air inlet, second air inlet and stator bar clamping groove.The utility model has the beneficial effects that (1) dry cooling eliminates the risk of damp, guarantees insulation performance;(2) multi-channel airflow structure realizes uniform and efficient heat dissipation;(3) double air inlet linkage heat dissipation.

Description

Technical Field

[0001] This utility model belongs to the field of radiator technology, and in particular relates to a welding cooling device for stator bars. Background Technology

[0002] Stator bars, as a crucial component of the stator in a hydro-generator set, have high insulation requirements. The welding process generates temperatures of 600-700 degrees Celsius. Due to the rapid heat transfer of copper conductors, the high temperatures during welding can easily damage the insulation at the bar ends. Therefore, cooling and protection of the bar end insulation layer are necessary during welding. The traditional method involves wrapping the bar ends with a damp cloth, relying on the evaporation of moisture from the cloth. However, during this process, excess water can seep into adjacent bars and the stator core, causing them to become damp and reducing their insulation. To restore the insulation, a hot air blower must be used to dry the bars and core after welding, which is not only time-consuming and labor-intensive but also poses a fire risk. Summary of the Invention

[0003] To address the problem that the heat dissipation methods in the prior art lead to a decrease in the insulation capacity of the stator bars and core, this utility model provides a welding cooling device for stator bars, including clamps and air-cooled clamp units. Two air-cooled clamp units are placed symmetrically to form an air-cooled clamp. The two ends of the air-cooled clamp are clamped by the clamps. The interior of each air-cooled clamp unit is provided with several ventilation grooves and two horizontal air channels. The side of the air-cooled clamp unit is provided with a first air inlet channel, a second air inlet channel, and a stator bar clamping groove.

[0004] In a preferred embodiment, the ventilation grooves are arranged in parallel.

[0005] In a preferred embodiment, the horizontal air duct extends laterally through the parallel ventilation grooves.

[0006] In a preferred embodiment, the first air inlet duct is connected to one end of the two horizontal air ducts, and the second air inlet duct is connected to the other end of the two horizontal air ducts through a connecting channel.

[0007] In a preferred embodiment, the first air inlet duct and the second air inlet duct are provided with multiple air inlets, which can be selected for use according to the actual situation. Unused air inlets are sealed with a first sealing plug and a second sealing plug.

[0008] In a preferred embodiment, an air pipe connector is installed at the air inlet of the first air inlet and the second air inlet, and the air inlet of the air pipe connector is connected to an external air pipe.

[0009] In a preferred embodiment, the clamp is fixedly connected to both ends of the air-cooled clamp by bolts.

[0010] The beneficial effects of this utility model are:

[0011] (1) Dry cooling eliminates the risk of moisture and ensures insulation performance: The device uses air-cooled clamps instead of wet cloths. Dry air (such as compressed air) is introduced through an external air source and forms a cooling airflow through the first air inlet, horizontal air duct and ventilation groove. This airflow directly carries away the heat of the insulation layer at the end of the bar. This dry cooling method completely avoids moisture contact with the bar and stator core, fundamentally solving the problem of insulation moisture caused by water seepage from wet cloths in traditional methods. There is no need for a drying process after welding, which saves working time and eliminates the secondary damage and fire risk caused by hot air drying. It significantly improves the insulation reliability of the stator bar and core.

[0012] (2) Multi-channel airflow structure achieves uniform and efficient heat dissipation: Several parallel ventilation grooves in the air-cooled clamp unit and the horizontal air duct that runs through it form a grid-like airflow channel, which increases the heat exchange area on the surface of the insulation layer, so that the high-speed airflow evenly covers the end of the bar, quickly removes the high temperature conducted by welding, controls the temperature of the insulation layer within the safe threshold, and effectively prevents the insulation material from aging or becoming brittle due to overheating.

[0013] (3) Dual air intake duct linkage heat dissipation: The first air intake duct and the second air intake duct are connected to the horizontal air duct through the connecting channel to form a bidirectional opposing cooling circuit of "intake-diversion-heat dissipation-exhaust", which solves the problem of uneven heat dissipation and low efficiency of traditional passive cooling methods. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a top view of the present invention.

[0016] Figure 3 for Figure 2 A cross-sectional view from the perspective of the AA (American Academy of Sciences).

[0017] In the diagram: 1. Clamp; 2. Air pipe connector; 3. Air-cooled clamp unit; 31. Ventilation groove; 32. First sealing plug; 33. First air inlet; 34. Horizontal air duct; 35. Second air inlet; 36. Connecting channel; 37. Second sealing plug; 38. Stator bar clamping groove. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Example

[0020] like Figure 1-3The stator bar welding cooling device shown includes clamps 1 and air-cooled clamp units 3. Two air-cooled clamp units 3 are placed symmetrically to form an air-cooled clamp. The two ends of the air-cooled clamp are clamped by clamps 1. The air-cooled clamp unit 3 has several ventilation grooves 31 and two horizontal air channels inside. The side of the air-cooled clamp unit 3 has a first air inlet channel 33, a second air inlet channel 35 and a stator bar clamping groove 38.

[0021] Furthermore, the ventilation grooves 31 are arranged in parallel.

[0022] Furthermore, the horizontal air duct 34 extends laterally through the parallel ventilation grooves 31.

[0023] Furthermore, the first air inlet duct 33 is connected to one end of the two horizontal air ducts 34, and the second air inlet duct 35 is connected to the other end of the two horizontal air ducts 34 through the connecting channel 36.

[0024] Furthermore, the first air inlet duct 33 and the second air inlet duct 35 are provided with multiple air inlets, which can be selected for use according to the actual situation. Unused air inlets are sealed by the first sealing plug 32 and the second sealing plug 37.

[0025] Furthermore, an air pipe connector 2 is installed at the air inlet of the first air inlet 33 and the second air inlet 35, and the air inlet of the air pipe connector 2 is connected to an external air pipe.

[0026] Furthermore, the clamp 1 is fixedly connected to both ends of the air-cooled clamp by bolts.

[0027] Furthermore, the air-cooled clamp unit 3 is made entirely of aluminum-magnesium alloy.

[0028] The above-mentioned cooling device is used as follows: the wire bar to be welded is placed in the stator wire bar clamping groove 38, and then the two air-cooling clamp units 3 are combined into an air-cooling clamp. The two ends of the air-cooling clamp are clamped with clamp 1. The external air source is connected to the air pipe connector 2. The external air source is started and welding is performed. Airflow is input into the device through the four air pipe connectors. The first air inlet duct 33 and the second air inlet duct 35 respectively deliver the airflow from two directions to the two horizontal air ducts 34, forming opposing airflows. The airflow enters the stator wire bar clamping groove 38 through the parallel ventilation grooves 31 to cool the stator wire bar. Since the ventilation grooves 31 are distributed along the axial direction of the stator wire bar, the airflow fully surrounds the stator wire bar, thus fully cooling the stator wire bar. Finally, the airflow is discharged from the top of the stator wire bar clamping groove 38.

Claims

1. A welding cooling device for stator bars, characterized in that, It includes clamps (1) and air-cooled clamp units (3). Two air-cooled clamp units (3) are placed symmetrically to form an air-cooled clamp. The two ends of the air-cooled clamp are clamped by clamps (1). The air-cooled clamp unit (3) has several ventilation grooves (31) and two horizontal air ducts inside. The side of the air-cooled clamp unit (3) has a first air inlet duct (33), a second air inlet duct (35) and a stator bar clamping groove (38).

2. The stator bar welding cooling device according to claim 1, characterized in that, The ventilation grooves (31) are arranged in parallel.

3. The stator bar welding cooling device according to claim 2, characterized in that, The horizontal air duct (34) is transversely connected to the parallel ventilation grooves (31).

4. The stator bar welding cooling device according to claim 1, characterized in that, The first air inlet duct (33) is connected to one end of the two horizontal air ducts (34), and the second air inlet duct (35) is connected to the other end of the two horizontal air ducts (34) through the connecting channel (36).

5. The stator bar welding cooling device according to claim 1, characterized in that, The first air inlet duct (33) and the second air inlet duct (35) are provided with multiple air inlets, which can be selected for use according to the actual situation. Unused air inlets are sealed by the first sealing plug (32) and the second sealing plug (37).

6. The stator bar welding cooling device according to claim 1, characterized in that, Air pipe connectors (2) are installed at the air inlets of the first air inlet (33) and the second air inlet (35), and the air inlet of the air pipe connectors (2) is connected to an external air pipe.

7. The stator bar welding cooling device according to claim 1, characterized in that, The clamp (1) is fixedly connected to both ends of the air-cooled clamp by bolts.

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