Electro-hydraulic separation device for end of stator winding of wind driven generator

Abstract

The application relates to the field of wind power generation technology, and particularly relates to a wind driven generator stator winding end portion electric-hydraulic separation device, which comprises a first joint sleeve connected to the upper layer winding end portion of a stator and a second joint sleeve connected to the lower layer winding portion of the stator. The side of the first joint sleeve and the side of the second joint sleeve are both provided with horizontally-extended connecting portions, the connecting portion of the first joint sleeve is detachably fixedly connected with the connecting portion of the second joint sleeve through fasteners. The end of the first joint sleeve away from the upper layer winding end portion of the stator and the end of the second joint sleeve away from the lower layer winding portion of the stator are both fixedly connected with lead-out joints, and the lead-out joints are all detachably connected with lead pipes in a sealed mode. The wind driven generator stator winding end portion electric-hydraulic separation device avoids the winding end portion blockage problem caused by the welding process of the welding fixed connection mode, and is convenient to maintain.

Description

Technical Field

[0001] This invention relates to the field of generator technology, and more specifically to an electro-hydraulic separation device at the end of the stator winding of a wind turbine generator. Background Technology

[0002] As generator unit capacity increases, the demand for single-unit power output is met, but this also leads to a significant increase in generator size, weight, and floor space. More importantly, it can cause excessive internal temperature rise, making the heat dissipation problem of large-capacity generators crucial. In the 1940s, many researchers proposed evaporative cooling technology for generators due to its irreplaceable advantages. Evaporative cooling technology, with its high reliability and ease of maintenance, is widely used in large generators. Evaporative cooling utilizes the absorption of latent heat of vaporization by the medium during vaporization for cooling. Generator evaporative cooling technology can be divided into in-pipe cooling and immersion cooling methods according to the cooling structure. Its cooling system consists of a heated hollow conductor, a return pipe, a gas collecting pipe, and a condenser. When current flows through the windings, the liquid working fluid inside the windings vaporizes and boils, carrying away the heat generated by resistance losses. The working fluid flowing out of the windings through the insulated drain pipe is in a gas-liquid mixed state, enters the condenser through the gas collecting pipe, cools the working fluid back into liquid, and then enters the windings through the return pipe, thus forming a cyclical system. The electro-hydraulic separation problem needs to be solved during the circulation process.

[0003] To solve the electro-hydraulic separation problem, the existing technology uses an integral parallel head sleeve to weld the upper and lower end windings together, and then uses an electro-hydraulic separation connector to directly weld onto the parallel head sleeve. However, the welding process can easily lead to blockage at the winding ends, and maintenance is difficult when blockage occurs at the winding ends or when the electro-hydraulic separation connector leaks cooling medium. Summary of the Invention

[0004] This invention provides an electro-hydraulic separation device for the end of the stator winding of a wind turbine generator to solve the technical problem that the electro-hydraulic separation mechanism in the prior art is prone to blockage at the end of the winding during welding and is difficult to maintain.

[0005] The present invention provides a technical solution for an electro-hydraulic separation device at the end of a wind turbine stator winding, comprising a first parallel sleeve connected to the end of the upper winding of the stator and a second parallel sleeve connected to the lower winding of the stator. Both the first parallel sleeve and the second parallel sleeve have horizontally extending connecting portions on one side and the connecting portions of the first parallel sleeve and the second parallel sleeve are detachably fixedly connected by fasteners.

[0006] The first parallel head sleeve has a lead-out connector fixedly connected to one end away from the upper stator winding and the second parallel head sleeve has a lead-out connector fixedly connected to one end away from the lower stator winding. Each lead-out connector is sealed and detachably connected to a drain pipe.

[0007] As a preferred embodiment, the connecting portion of the first parallel head sleeve has a vertical first inclined surface, and the connecting portion of the second parallel head sleeve has a vertical second inclined surface. The first inclined surface and the second inclined surface are arranged in close contact, and the fastener passes through the first inclined surface and the second inclined surface.

[0008] As a preferred embodiment, both the connecting portion of the first and second parallel head sleeves are conical, both the first and second inclined surfaces are inclined surfaces of the conical, and the connecting portions of the first and second parallel head sleeves fit together to form a cuboid.

[0009] The fastener is a bolt, which passes horizontally through the cuboid.

[0010] As a preferred embodiment, the upper part of the first parallel head sleeve is welded and fixed to the lead-out connector, and the upper part of the second parallel head sleeve is welded and fixed to the lead-out connector;

[0011] Both the upper ends of the first and second parallel head sleeves are equipped with barriers to prevent the welding flux from flowing to the hollow part at the nose end of the stator winding when the lead-out connector is welded to the first / second parallel head sleeve.

[0012] As a preferred embodiment, each of the lead-out connectors and the drainage tube is equipped with a sealing buckle, and the end of the lead-out connector that contacts the drainage tube inside the sealing buckle is also provided with a sealing gasket.

[0013] Compared to existing technologies, the beneficial effects of this application are:

[0014] The electro-hydraulic separation device for the stator winding end of this application includes a first parallel sleeve connected to the end of the upper stator winding and a second parallel sleeve connected to the lower stator winding. Both the first and second parallel sleeves have horizontally extending connecting portions on one side and the connecting portions of the first and second parallel sleeves, respectively. The connecting portions of the first and second parallel sleeves are detachably fixedly connected by fasteners. Lead-out connectors are fixedly connected to the end of the first parallel sleeve away from the end of the upper stator winding and the end of the second parallel sleeve away from the lower stator winding. Each lead-out connector is sealed and detachably connected to a drain pipe, which avoids the blockage of the winding end caused by welding during the welding process. It also facilitates maintenance when the winding end is blocked or the electro-hydraulic separation connector leaks cooling medium.

[0015] The electro-hydraulic separation device at the stator winding end of this application separates the conductive circuit from the cooling medium circuit, preventing interference between the two and resulting in a more significant cooling effect. This makes the evaporative cooling wind turbine more stable in operation, enabling stable operation during long-term operation. Existing stator winding end electro-hydraulic separation devices require numerous welding points during installation, leading to installation complexity; this invention simplifies the structure as much as possible, reducing the number of welding points.

[0016] In the prior art, the electro-hydraulic separation device at the stator winding end is prone to blockage at the winding end when welding it to other components; the present invention provides a barrier at the upper end of the first parallel head sleeve and the upper end of the second parallel head sleeve to avoid the blockage problem during welding.

[0017] Existing stator winding end electro-hydraulic separation devices are designed as a single unit, which cannot be disassembled separately, making maintenance very troublesome; the present invention uses detachable connecting parts at the joints of components as much as possible. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the electro-hydraulic separation device at the end of the stator winding of the wind turbine generator according to the present invention;

[0019] Figure 2 This is a schematic diagram of the first and second headgear;

[0020] Figure 3 This is a schematic diagram of the structure at the end of the upper winding of the stator;

[0021] Figure 4 This is a schematic diagram of the connection between the drainage tube and the outlet connector.

[0022] Among them, 1. Drainage pipe, 2. Sealing buckle, 3. Lead-out connector, 4. Bolt, 5. First parallel head sleeve, 6. Stator upper winding end, 7. Second parallel head sleeve, 8. Stator lower winding end. Detailed Implementation

[0023] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0024] Generator evaporative cooling technology can be divided into in-pipe cooling and immersion cooling methods according to the cooling structure. This application focuses on the in-pipe cooling method, in which the cooling system consists of a heated hollow conductor, a return pipe, a gas collecting pipe, and a condenser. When the medium comes into contact with the heat-generating component, the medium absorbs heat and its temperature rises. When the temperature of the medium reaches the saturation temperature corresponding to its saturation pressure, the medium begins to vaporize, absorbing heat. The vaporized gaseous medium is introduced into a heat exchanger called the condenser. In the condenser, the gaseous medium exchanges heat with the secondary cooling medium and is condensed back into a liquid state. The condensed liquid evaporative medium is then sent back into the motor for the next cycle. A crucial issue in this cycle system is how to separate the conductive circuit and the cooling circuit, ensuring that they do not interfere with each other.

[0025] A preferred embodiment of the electro-hydraulic separation device at the end of the stator winding of the wind turbine generator of the present invention, such as... Figures 1 to 4 As shown, it includes a first parallel head sleeve 5 connected to the end 6 of the upper stator winding and a second parallel head sleeve 7 connected to the lower stator winding. One side of the first parallel head sleeve 5 and one side of the second parallel head sleeve 7 have horizontally extending connecting portions. The connecting portions of the first parallel head sleeve 5 and the second parallel head sleeve 7 are detachably fixedly connected by fasteners, so that the first parallel head sleeve 5 and the second parallel head sleeve 7 form a complete parallel head sleeve. The end of the first parallel head sleeve 5 away from the end 6 of the upper stator winding and the end of the second parallel head sleeve 7 away from the lower stator winding are both fixedly connected with lead-out connectors 3. Each lead-out connector 3 is sealed and detachably connected with a drain pipe 1, which avoids the blockage of the winding end caused by the welding process caused by the connection method of welding. It also facilitates maintenance when the winding end is blocked or the electro-hydraulic separation joint leaks cooling medium.

[0026] The cooling medium of the electro-hydraulic separation device at the end of the stator winding of the wind turbine in this application flows out through the hollow pipes at the nose end of the upper stator winding end 6 and the lower stator winding end 8, and can be collected in the cooling medium lead-out connector 3. After passing through the cooling medium lead-out connector 3, the cooling medium flows out through the circular channel, forming a circulation loop for the cooling medium.

[0027] In a preferred embodiment of this application, the connecting portion of the first parallel head sleeve 5 has a vertical first inclined surface, and the connecting portion of the second parallel head sleeve 7 has a vertical second inclined surface. The first and second inclined surfaces are arranged in close contact, and the fastener passes through the first and second inclined surfaces. In specific implementation, the first parallel head sleeve 5 and the second parallel head sleeve 7 have the same structure, and when specifically connected to the stator upper winding end 6 or the stator lower winding end 8, the first parallel head sleeve 5 and the second parallel head sleeve 7 are arranged opposite to each other so that the first and second inclined surfaces can be relatively close together.

[0028] In a further embodiment of this application, the connecting part of the first parallel head sleeve 5 and the connecting part of the second parallel head sleeve 7 are both conical bodies, the first inclined surface and the second inclined surface are both inclined surfaces of the conical bodies, and the connecting part of the first parallel head sleeve 5 and the connecting part of the second parallel head sleeve 7 fit together to form a cuboid, forming a regular shape, which is convenient for installation and disassembly and avoids occupying space; the fastener is a bolt 4, and the bolt 4 passes horizontally through the cuboid.

[0029] In other embodiments of this application, the structures of the first connecting part and the second connecting part can be other structures capable of connecting the first parallel head sleeve 5 and the second parallel head sleeve 7. For example, the first connecting part has a pre-reserved groove, and the second connecting part has a protrusion that can be matched and inserted into the groove. The bolt 4 passes through both the groove and the protrusion to fix the first parallel head sleeve 5 and the second parallel head sleeve 7. This design has advantages such as a more stable structure and easier maintenance.

[0030] In a preferred embodiment of this application, the upper part of the first parallel head sleeve 5 is welded and fixed to the lead-out connector 3, and the upper part of the second parallel head sleeve 7 is welded and fixed to the lead-out connector 3; and, the upper ends of the first parallel head sleeve 5 and the second parallel head sleeve 7 are both provided with a barrier to prevent the solder from flowing to the hollow part at the nose end of the stator winding when the lead-out connector 3 is welded to the first parallel head sleeve 5 / second parallel head sleeve 7, so as to avoid blockage during welding.

[0031] In a preferred embodiment of this application, a sealing buckle 2 is installed between each lead-out connector 3 and the drainage tube 1. A sealing gasket is also provided at the end of the lead-out connector 3 that contacts the drainage tube 1 within the sealing buckle 2. The sealing buckle 2 can be tightened with a self-tightening screw to connect the lead-out connector 3 and the drainage tube 1, and is easy to disassemble during installation and maintenance. In other embodiments of this application, other detachable, fixed, and sealed connectors can also be used between the lead-out connector 3 and the drainage tube 1.

[0032] The electro-hydraulic separation device at the end of the stator winding of the wind turbine of the present invention reduces welding points and facilitates installation; the structural design of the parallel head sleeve avoids clogging problems during welding; and the use of detachable connecting parts in the cooling circuit facilitates maintenance. This invention is used at the end of the stator winding of a horizontal evaporative-cooled wind turbine, but it is applicable to all evaporative-cooled generators for electro-hydraulic separation purposes.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

[0035] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A wind turbine stator winding end electro-hydraulic separation device, characterized in that, It includes a first parallel head sleeve connected to the end of the upper winding of the stator and a second parallel head sleeve connected to the lower winding of the stator. Both the first parallel head sleeve and the second parallel head sleeve have horizontally extending connecting portions on one side and the connecting portions of the first parallel head sleeve and the second parallel head sleeve are detachably fixedly connected by fasteners. The first parallel head sleeve has a lead-out connector fixedly connected to one end away from the upper stator winding and the second parallel head sleeve has a lead-out connector fixedly connected to one end away from the lower stator winding. Each lead-out connector is sealed and detachably connected to a drain pipe.

2. The electro-hydraulic separation device at the end of the stator winding of a wind turbine generator according to claim 1, characterized in that: The connecting part of the first parallel head sleeve has a vertical first inclined surface, and the connecting part of the second parallel head sleeve has a vertical second inclined surface. The first inclined surface and the second inclined surface are arranged in close contact, and the fastener passes through the first inclined surface and the second inclined surface.

3. The electro-hydraulic separation device at the end of the stator winding of a wind turbine generator according to claim 2, characterized in that: Both the connecting part of the first and the connecting part of the second parallel head sleeve are conical, both the first and the second inclined surfaces are inclined surfaces of the conical, and the connecting parts of the first and the second parallel head sleeve fit together to form a cuboid. The fastener is a bolt, which passes horizontally through the cuboid.

4. The electro-hydraulic separation device at the end of the stator winding of a wind turbine generator according to claim 1, characterized in that: The upper part of the first parallel head sleeve is welded and fixed to the lead-out connector, and the upper part of the second parallel head sleeve is welded and fixed to the lead-out connector; Both the upper ends of the first and second parallel head sleeves are equipped with barriers to prevent the welding flux from flowing to the hollow part at the nose end of the stator winding when the lead-out connector is welded to the first / second parallel head sleeve.

5. The electro-hydraulic separation device at the end of the stator winding of a wind turbine generator according to claim 1, characterized in that: Each of the aforementioned lead-out connectors and drainage tubes is equipped with a sealing buckle, and the end of the lead-out connector that contacts the drainage tube within the sealing buckle is also provided with a sealing gasket.

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