Vertical water turbine generator rotor pump-free self-circulation evaporation cooling magnetic pole coil

Abstract

The application provides a vertical water turbine generator rotor pump-free self-circulation evaporation cooling magnetic pole coil and relates to the technical field of rotor evaporation cooling. The existing technology still adopts an air cooling mode for the rotor, which faces the problem of temperature exceeding the allowable range of B-grade insulation. The coil body comprises N turns of hollow metal conductive wires and a cooling channel, and the coil body is electrically connected with a pole shoe side lead assembly and a pole root side lead assembly at both ends; the cooling channel is connected with the pole shoe side lead assembly and the pole root side lead assembly at both ends; along the radial direction of the coil body, the outermost layer of the hollow metal conductive wire at the end of the coil body away from the pole root side lead assembly is the first turn of hollow metal conductive wire, and a liquid inlet joint is arranged at the bottom of the first turn of hollow metal conductive wire. The application is used for realizing the evaporation cooling of the water turbine generator rotor, reducing the temperature of the rotor coil and meeting the safe and reliable operation of the unit.

Description

Technical Field

[0001] This invention relates to the field of rotor evaporative cooling technology, and in particular to a magnetic pole coil for pumpless self-circulating evaporative cooling of a vertical hydro generator rotor. Background Technology

[0002] Currently, there are three cooling methods for giant turbine generator units (large hydro-generators of 600MW and above): all-air cooling, evaporative cooling, and water cooling. Evaporative cooling, also a direct cooling method, is more popular than water cooling due to its safety and reliability. Currently, only the stator bars use evaporative cooling, while the rotor still uses air cooling, which faces the problem of temperatures exceeding the allowable range of Class B insulation. The current solution is to use Class H insulation materials, but this has not yet been accepted by the industry and owners. Therefore, it is necessary to develop evaporative cooling technology suitable for vertical hydro-generator rotors, and to complement the stator evaporative cooling technology, to achieve the goal of safe and reliable unit operation. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a pumpless self-circulating evaporative cooling magnetic pole coil for a vertical hydro-generator rotor, achieving evaporative cooling of the hydro-generator rotor, reducing the temperature of the rotor coil, and ensuring the safe and reliable operation of the unit.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a vertical hydro generator rotor pumpless self-circulating evaporative cooling magnetic pole coil, comprising a coil body consisting of N turns of hollow metal conductive wire wound with internal cooling channels, and a pole shoe side lead assembly and a pole root side lead assembly electrically connected to both ends of the coil body respectively. One end of the pole shoe side lead assembly is connected to the cooling channel, and the other end is connected to the external air outlet pipe. One end of the electrode root side lead assembly is connected to the cooling channel, and the other end is connected to the external air outlet pipe. Along the radial direction of the coil body, the outermost hollow metal conductive wire at the end of the coil body away from the pole root side lead assembly is the first turn of hollow metal conductive wire. A liquid inlet connector is provided at the bottom of the first turn of hollow metal conductive wire. One end of the liquid inlet connector is connected to the cooling channel, and the other end is connected to the external liquid supply pipe.

[0005] Furthermore, the pole shoe side lead assembly includes a wide pole shoe side lead, a deformable pole shoe side lead, a narrow pole shoe side lead, a vent connector for the pole shoe side lead, and an electrical connector for the pole shoe side, all of which are hollow and connected in sequence. The wide pole shoe side lead is connected to the cooling channel, the electrical connector for the pole shoe side is fixed to the outer wall of the narrow pole shoe side lead, and the vent connector for the pole shoe side lead is connected to an external vent pipe.

[0006] Furthermore, the electrode root side lead assembly includes hollow electrode root side wide lead, electrode root side lead deformation block, electrode root side narrow lead, electrode root side lead vent connector, and electrode root side electrical connector, all connected in sequence. The electrode root side wide lead is connected to the cooling channel, the electrode root side electrical connector is fixed to the outer wall of the electrode root side narrow lead, and the electrode root side lead vent connector is connected to the external vent pipe.

[0007] Furthermore, the current-carrying area of ​​the narrow lead wire on the pole shoe side is smaller than that of the narrow lead wire on the pole root side, which helps to adjust the branch flow resistance.

[0008] Furthermore, an insulating layer is provided between adjacent turns of the hollow metal conductive wire.

[0009] Furthermore, the wall thickness of the first turn of the hollow metal conductive wire is greater than that of the second turn of the hollow metal conductive wire, and the wall thicknesses of the second to Nth turns of the hollow metal conductive wire are the same.

[0010] Furthermore, the hollow region area of ​​the first turn of hollow metal conductive wire is greater than the hollow region area of ​​the second turn of hollow metal conductive wire, and the hollow region areas of the second to Nth turns of hollow metal conductive wire are the same.

[0011] Furthermore, the cooling channel between the first and second hollow metal conductive wires is provided with a gradually narrowing hollow transition section.

[0012] Furthermore, the hollow metal conductive wire is a hollow copper wire.

[0013] Compared with the prior art, the beneficial effects of the pumpless self-circulating evaporative cooling magnetic pole coil of the vertical hydro generator rotor described in this invention are: 1. The magnetic pole coil structure of the vertical hydro generator provided by this invention enables the rotor of the hydro generator to also use evaporative cooling technology, forming a matching combination with the stator evaporative cooling technology. Evaporative cooling utilizes phase change heat absorption, which will make the cooling effect better and can avoid the situation of excessive temperature during the operation of high power density hydro generators.

[0014] 2. The magnetic pole coil structure of the vertical hydro generator provided by the present invention allows the liquid supply pipe and the gas outlet pipe to both extend from the center of the rotating shaft to the stator during use. The rotation of the rotor provides power to the rotor cooling circuit, which simplifies the cooling circuit, improves reliability, reduces the pressure of the cooling medium at the rotor inlet and outlet, lowers the rotor temperature, keeps the generator temperature within the allowable range, and improves the safety and reliability of the generator.

[0015] 3. The present invention has fewer external liquid inlet and outlet interfaces on the coil body, with only one liquid inlet connector designed on the coil body. The fewer openings improve the structural strength and ensure the safety and reliability of the rotor coil evaporative cooling.

[0016] 4. During the rotation of the rotor coil of a hydro-generator, a centrifugal pressure difference is generated due to the different densities of the medium on the inlet side and the outlet side. In this invention, the inlet connector is located on the outermost side of the coil pole shoe. This position ensures that the entire coil body is within the range of the pressure difference generated by the centrifugal force of the rotor, thereby achieving a pump-free self-circulating evaporative cooling effect for the rotor.

[0017] 5. Conventional hollow copper wire can meet the requirements of evaporative cooling. However, considering that the first turn of the hollow metal conductive wire is equipped with a liquid inlet connector, the present invention thickens and reinforces the first turn of the hollow metal conductive wire, making its wall thickness greater than that of conventional hollow copper wire, to ensure that the structure at the liquid inlet connector is safer and more reliable.

[0018] 6. The cooling channel between the first and second hollow metal conductive wires of the present invention is provided with a gradually narrowing hollow transition section, which realizes the transformation of the internal cooling channel when the thickened and reinforced hollow copper wire is transformed into a regular hollow copper wire. It flexibly connects the internal cooling channel of the thickened and reinforced first hollow metal conductive wire where the liquid inlet is located with the narrower internal cooling channel of the regular hollow metal conductive wire, avoiding abrupt shape changes that would hinder the flow of cooling medium in the cooling channel. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a front view of a vertical hydro generator rotor rotor with pumpless self-circulating evaporative cooling magnetic pole coil according to the present invention. Figure 2 For the present invention Figure 1 A sectional view along line A in the middle; Figure 3 For the present invention Figure 1 Sectional view along line B; Figure 4 This is a top view of a vertical hydro generator rotor with pumpless self-circulating evaporative cooling magnetic pole coil as described in this invention. Figure 5 For the present invention Figure 4 A sectional view along the C-axis; Figure 6 For the present invention Figure 4 A sectional view along the D direction; Figure 7 For the present invention Figure 4 A sectional view along line E; In the diagram: 1-Coil body; 2-Pole shoe side lead assembly; 3-Pole root side lead assembly; 4-Cooling channel; 11-First turn of hollow metal conductive wire; 12-Liquid inlet connector; 13-Insulation layer; 21-Wide lead wire on pole shoe side; 22-Deformed block for lead wire on pole shoe side; 23-Narrow lead wire on pole shoe side; 24-Gas outlet connector for lead wire on pole shoe side; 25-Electrical connector for pole shoe side; 31 - Wide lead wire on the pole root side; 32 - Deformed block of lead wire on the pole root side; 33 - Narrow lead wire on the pole root side; 34 - Air outlet connector of lead wire on the pole root side; 35 - Electrical connector on the pole root side. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0021] I. Detailed Implementation Method 1, see [link / reference] Figure 1-7 This embodiment describes a vertical hydro generator rotor with pumpless self-circulating evaporative cooling magnetic pole coil, comprising a coil body 1 consisting of N turns of hollow metal conductive wire wound with an internal cooling channel 4, and a pole shoe side lead assembly 2 and a pole root side lead assembly 3 electrically connected to the two ends of the coil body respectively. One end of the pole shoe side lead assembly 2 is connected to the cooling channel 4, and the other end is connected to the external air outlet pipe. One end of the pole root side lead assembly 3 is connected to the cooling channel 4, and the other end is connected to the external air outlet pipe. Along the radial direction of the coil body 1, the outermost hollow metal conductive wire at the end of the coil body 1 away from the pole root side lead assembly 3 is the first turn of hollow metal conductive wire 11. A liquid inlet connector 12 is provided at the bottom of the first turn of hollow metal conductive wire 11. One end of the liquid inlet connector 12 is connected to the cooling channel 4, and the other end is connected to the external liquid supply pipe.

[0022] The pole shoe side lead assembly 2 includes a wide pole shoe lead 21, a deformable pole shoe lead 22, a narrow pole shoe lead 23, a vent connector 24, and an electrical connector 25, all of which are hollow and connected in sequence. The wide pole shoe lead 21 is connected to the cooling channel 4. The electrical connector 25 is fixed to the outer wall of the narrow pole shoe lead 23. The vent connector 24 is connected to an external vent pipe.

[0023] The electrode root side lead assembly 3 includes a hollow electrode root side wide lead 31, an electrode root side lead deformation block 32, an electrode root side narrow lead 33, an electrode root side lead vent connector 34, and an electrode root side electrical connector 35, all of which are connected in sequence. The electrode root side wide lead 31 is connected to the cooling channel 4. The electrode root side electrical connector 35 is fixed to the outer wall of the electrode root side narrow lead 33. The electrode root side lead vent connector 34 is connected to an external vent pipe.

[0024] The flow area of ​​the narrow lead 23 on the pole shoe side is smaller than that of the narrow lead 33 on the pole root side, which plays a role in balancing the flow resistance of the branch.

[0025] An insulating layer 13 is provided between adjacent turns of the hollow metal conductive wire. The insulating layer 13 is composed of insulating medium powder and insulating adhesive.

[0026] The wall thickness of the first turn of the hollow metal conductive wire 11 is greater than that of the second turn of the hollow metal conductive wire, and the wall thickness of the second to Nth turns of the hollow metal conductive wire is the same.

[0027] The hollow area of ​​the first turn of the hollow metal conductive wire 11 is greater than the hollow area of ​​the second turn of the hollow metal conductive wire, and the hollow areas of the second to Nth turns of the hollow metal conductive wire are the same.

[0028] The cooling channel 4 between the first turn of hollow metal conductive wire 11 and the second turn of hollow metal conductive wire is provided with a gradually narrowing hollow transition section.

[0029] The hollow metal conductive wire is a hollow copper wire.

[0030] The working principle of this invention is as follows: See attached document Figure 4The cooling medium enters from the center of the rotor on the upper shaft of the hydro-generator, passes through a pipeline inside the rotor support, down to the bottom of the rotor support, enters the supply pipe below the rotor magnet, reaches the bottom of the magnetic pole coil, and enters the central flow channel of the first turn of hollow metal conductive wire 11 through the inlet connector 12. On the pole root side, it passes sequentially through the left half-turn of the first turn of hollow metal conductive wire 11, the internal cooling channel 4 of the second to Nth turns of hollow metal conductive wire, the wide lead wire 31 on the pole root side, the deformable block 32 on the pole root side lead wire, and the narrow lead wire 33 on the pole root side, and finally exits from the pole root side lead wire outlet connector 34. On the pole shoe side, it passes sequentially through the right half-turn of the first turn of hollow metal conductive wire 11, the wide lead wire 21 on the pole shoe side, the deformable block 22 on the pole shoe side lead wire, and the narrow lead wire 23 on the pole shoe side, and finally exits from the pole shoe side lead wire outlet connector 24. The cooling medium enters the return gas pipe through the two lead-out gas connectors mentioned above. After entering the return gas pipe, the cooling medium returns to the center of the upper shaft rotor above the rotor yoke and rotor support, running parallel to the supply pipe. The two pipes rise together and converge into a chamber. The liquid level in this chamber is the supply level of the cooling medium, and the height of the return gas pipe is slightly higher than the supply level.

[0031] Initially, because the liquid levels in the supply and exhaust pipes leading to and from the rotor center are at the same level, the cooling medium does not flow. After the rotor rotates and is energized, current flows through the hollow copper wires, generating heat. When the cooling medium inside cooling channel 4 reaches its evaporation temperature, it absorbs heat from the hollow copper wires of the rotor coil, partially converting from liquid to gas, forming a two-phase flow that flows upwards within the hollow copper wires. Initially, the liquid level difference between the supply and exhaust pipes drives the medium flow. This results in the medium density on the supply pipe side being greater than that on the exhaust pipe side, thus increasing the centrifugal pressure on the supply pipe side. Under this pressure difference, the cooling medium is propelled, achieving pump-free self-circulation.

[0032] A method for forming a pumpless self-circulating evaporative cooling magnetic pole coil for a vertical hydro generator rotor involves first welding a liquid inlet connector 12 to the bottom of the first turn of thickened and reinforced hollow metal conductive wire 11. Then, one end of the first turn of hollow metal conductive wire 11 is sequentially welded with hollow copper wire 2 (featuring the hollow transition section) and ordinary hollow copper wire. The coil is then wound (or welded) clockwise on a magnetic pole body mold, with an insulating layer 13 placed between each layer. The coil is wound to the designed number of turns according to technical requirements. The ends of the wound coil are then arranged according to the drawings. Finally, insulating medium powder and insulating material are filled between the coils. Insulating adhesive is used to improve the overall integrity of the magnetic pole coil, resulting in coil body 1. Coil body 1 is then removed from the magnetic pole mold. A mold composed of magnetic pole slides is used to shape and solidify coil body 1. Then, at one end of coil body 1, the following components are sequentially welded: wide lead wire 21, deformable block 22, narrow lead wire 23, vent connector 24, and electrical connector 25 on the pole shoe side. At the other end, the following components are sequentially welded: wide lead wire 31, deformable block 32, narrow lead wire 33, vent connector 34, and electrical connector 35 on the pole root side. This entire magnetic pole coil is then fitted onto the magnetic pole body of the hydro-generator to form the hydro-generator magnetic pole. The accompanying drawings of this invention show an open coil; the same applies to closed coils.

[0033] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A pump-free, self-circulating evaporative cooling magnetic pole coil for a vertical hydro-generator rotor, characterized in that, It includes a coil body (1) consisting of N turns of hollow metal conductive wire wound together and containing a cooling channel (4), and a pole shoe side lead assembly (2) and a pole root side lead assembly (3) electrically connected to both ends of the coil body respectively. One end of the pole shoe side lead assembly (2) is connected to the cooling channel (4), and the other end is connected to the external air outlet pipe; One end of the pole root side lead assembly (3) is connected to the cooling channel (4), and the other end is connected to the external air outlet pipe; Along the radial direction of the coil body (1), the outermost hollow metal conductive wire at the end of the coil body (1) away from the pole root side lead assembly (3) is the first turn of hollow metal conductive wire (11). A liquid inlet connector (12) is provided at the bottom of the first turn of hollow metal conductive wire (11). One end of the liquid inlet connector (12) is connected to the cooling channel (4), and the other end is connected to the external liquid supply pipe.

2. The magnetic pole coil for pump-free self-circulating evaporative cooling of a vertical hydro-generator rotor according to claim 1, characterized in that, The pole shoe side lead assembly (2) includes a wide pole shoe lead (21), a deformable pole shoe lead (22), a narrow pole shoe lead (23), a vent connector (24), and an electrical connector (25), all of which are hollow and connected in sequence. The wide pole shoe lead (21) is connected to the cooling channel (4), the electrical connector (25) is fixed to the outer wall of the narrow pole shoe lead (23), and the vent connector (24) is connected to an external vent pipe.

3. The magnetic pole coil for pump-free self-circulating evaporative cooling of a vertical hydro-generator rotor according to claim 2, characterized in that, The pole root side lead assembly (3) includes a pole root side wide lead (31), a pole root side lead deformation block (32), a pole root side narrow lead (33), a pole root side lead vent connector (34), and a pole root side electrical connector (35), all of which are hollow and connected in sequence. The pole root side wide lead (31) is connected to the cooling channel (4), the pole root side electrical connector (35) is fixed to the outer wall of the pole root side narrow lead (33), and the pole root side lead vent connector (34) is connected to the external vent pipe.

4. The magnetic pole coil for pump-free self-circulating evaporative cooling of a vertical hydro-generator rotor according to claim 3, characterized in that, The current-carrying area of ​​the narrow lead (23) on the pole shoe side is smaller than that of the narrow lead (33) on the pole root side.

5. The magnetic pole coil for pump-free self-circulating evaporative cooling of a vertical hydro-generator rotor according to claim 1, characterized in that, An insulating layer (13) is provided between adjacent turns of the hollow metal conductive wire.

6. The magnetic pole coil for pump-free self-circulating evaporative cooling of a vertical hydro-generator rotor according to claim 1, characterized in that, The wall thickness of the first turn of the hollow metal conductive wire (11) is greater than that of the second turn of the hollow metal conductive wire, and the wall thickness of the second to Nth turns of the hollow metal conductive wire is the same.

7. The magnetic pole coil for pump-free self-circulating evaporative cooling of a vertical hydro-generator rotor according to claim 1, characterized in that, The hollow area of ​​the first turn of the hollow metal conductive wire (11) is greater than that of the second turn of the hollow metal conductive wire, and the hollow areas of the second to Nth turns of the hollow metal conductive wire are the same.

8. The magnetic pole coil for pump-free self-circulating evaporative cooling of a vertical hydro-generator rotor according to claim 1, characterized in that, The cooling channel (4) between the first turn of hollow metal conductive wire (11) and the second turn of hollow metal conductive wire is provided with a gradually shrinking hollow transition section.

9. The magnetic pole coil for pump-free self-circulating evaporative cooling of a vertical hydro-generator rotor according to claim 1, characterized in that, The hollow metal conductive wire is a hollow copper wire.

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