Hydro-generator stator winding cooling structure

Abstract

The utility model relates to water turbine generator technical field, concretely relates to a water turbine generator stator winding cooling structure, including water turbine generator shell and the stator winding of setting in water turbine generator shell, be provided with the water inlet pipe in water turbine generator shell, the water inlet pipe's water inlet end fixed mounting has the joint pipe that goes out water turbine generator shell, fixed mounting has a plurality of lead -through pipes on the water inlet pipe, the end of lead -through pipe fixed mounting has the serpentine heat exchange tube, the serpentine heat exchange tube is located close to stator winding part, the end of serpentine heat exchange tube fixed mounting has the water outlet pipe, and the end of a plurality of water outlet pipes is provided with the converging pipe for the water discharge after heat exchange, be provided with the external connection pipe for water flow introduction on the joint pipe, the water inlet end fixed mounting has the curved pipe of external connection pipe, the curved pipe's end fixed mounting has the water inlet cover, and the water inlet cylinder detachably installs the impurity blocking net. The utility model is convenient for cooling, heat exchange operation, and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of hydro-generator technology, and more specifically, to a hydro-generator stator winding cooling structure. Background Technology

[0002] Hydropower generators are mostly used in hydropower stations of hydropower projects. During operation, the stator windings of hydropower generators generate a lot of heat. If this heat cannot be dissipated in a timely and effective manner, it will lead to excessively high stator winding temperatures, thereby reducing generator efficiency, shortening the service life of insulation materials, and even causing serious faults such as insulation breakdown, affecting the safe and stable operation of hydropower generators.

[0003] Currently, the common cooling methods for stator windings of hydro generators are air cooling and liquid cooling. Air cooling has a relatively simple structure, but its cooling efficiency is low, making it difficult to meet the heat dissipation requirements of large-capacity hydro generators. Liquid cooling has a better cooling effect, but it is more expensive and requires the installation of drive components and heat exchange components before it can be used.

[0004] Patent CN105762955B discloses a spiral-wound grooved stator for a hydro-generator, which improves heat dissipation and relates to the field of electric motors. This invention addresses the problem of high temperatures in the stator region of existing hydro-generators. The stator cores are arranged at equal intervals along the axial direction, with radial ventilation grooves between them. A chamfer 'a' is machined at the tip of the stator core teeth. The main stator insulation wraps around the outer sides of the lower and upper copper windings. Stator grooves are formed on the surface of the stator core. Straight grooves penetrate the stator core teeth and yoke radially, while spiral grooves encircle the outer surface of the main insulation at the stator core tooth positions and then penetrate the stator yoke radially. Radial ventilation holes are formed inside the stator end core, penetrating radially through the end core. This invention enhances the cooling effect of the hydro-generator stator region, has a simple structure, and is easy to implement.

[0005] While this technical solution has its advantages, most current stator winding cooling structures still rely on the traditional method of adding coolant and using a pump to deliver it for heat exchange. This type of cooling requires significant energy consumption. For example, using a pump for delivery or cooling components to cool the internal coolant requires considerable electrical energy, and the structure is relatively complex, affecting ease of use. Therefore, we propose a cooling structure for the stator windings of a hydro-generator. Utility Model Content

[0006] The purpose of this invention is to provide a cooling structure for the stator winding of a hydro-generator to address the deficiencies mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A stator winding cooling structure for a hydro-generator includes a hydro-generator housing and a stator winding disposed within the hydro-generator housing. A water inlet pipe is provided inside the hydro-generator housing. A connector pipe extending out of the hydro-generator housing is fixedly installed at the water inlet end of the water inlet pipe. Multiple conductive pipes are fixedly installed on the water inlet pipe. A serpentine heat exchange tube is fixedly installed at the end of each conductive pipe, located near the stator winding. A water outlet pipe is fixedly installed at the end of each serpentine heat exchange tube. The ends of the multiple water outlet pipes are provided with converging pipes for discharging water after heat exchange. An external connecting pipe for introducing water is provided on the connector pipe.

[0009] Preferably, a one-way valve is fixedly installed on the water outlet pipe, and the one-way valve is used for one-way discharge of water.

[0010] Preferably, a curved pipe is fixedly installed at the water inlet end of the external pipe, with the end of the curved pipe facing downstream of the river;

[0011] This feature prevents impurities flowing from upstream to downstream from entering the curved pipe.

[0012] Preferably, a water inlet cover is fixedly installed at the end of the curved pipe, and a water inlet cylinder is fixedly installed at the end of the water inlet cover;

[0013] This design allows water to flow smoothly into the inlet cylinder and eventually into the serpentine heat exchange tube for heat exchange.

[0014] Preferably, an impurity blocking net is detachably installed inside the water inlet cylinder, and the impurity blocking net is used to block impurities in the water.

[0015] Preferably, a support ring is fixedly installed on the inner wall of the water inlet cylinder, and a fixing ring is fixedly installed on the outside of the impurity blocking net. The fixing ring is detachably installed on the end face of the support ring by a plurality of fastening screws.

[0016] Preferably, a mesh disc is fixedly installed on the inner annular side of the fixing ring, and the impurity blocking mesh is fixedly installed on the upper surface of the mesh disc.

[0017] Preferably, a plurality of blocking cones are fixedly installed on the impurity blocking net, and the blocking cones are conical in shape;

[0018] This setting prevents impurities from completely covering the surface of the impurity blocking mesh and causing blockages.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. This utility model uses a cooling structure consisting of an inlet pipe, a guide pipe, a serpentine heat exchange pipe, an outlet pipe, and a converging pipe. It utilizes the water flow in the river channel arranged by the water turbine generator to carry away the heat of the stator windings. It eliminates the need for a traditional pump to transport coolant, thereby reducing energy consumption and simplifying the cooling structure and improving ease of use.

[0021] 2. This utility model ensures that water can only be discharged in one direction by installing a one-way valve on the water outlet pipe; the end of the curved pipe faces downstream of the river, and together with the water inlet cover, water inlet cylinder and impurity blocking net, it effectively prevents impurities in the water from entering the cooling system, thus achieving the function of ensuring the stable operation of the cooling system, reducing impurity blockage and extending the service life of the equipment.

[0022] 3. This utility model allows the impurity blocking net to be detachably installed inside the water inlet cylinder via a fixing ring and a support ring, which facilitates the regular cleaning of the intercepted impurities. The blocking cone on the impurity blocking net can prevent impurities from completely covering the net surface and causing blockage, thus achieving convenient maintenance and cleaning operations, and achieving the effect of maintaining good heat exchange performance of the cooling system and ensuring effective cooling of the stator winding. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is one of the partial structural schematic diagrams of this utility model;

[0025] Figure 3 This is the second partial structural schematic diagram of the present utility model;

[0026] Figure 4 This is the third partial structural schematic diagram of this utility model;

[0027] The meanings of the labels in the diagram are as follows:

[0028] 1. Hydro-generator casing; 10. Stator windings;

[0029] 2. Inlet pipe; 20. Connector pipe; 21. Conductor pipe; 22. Serpentine heat exchanger tube; 23. Outlet pipe; 231. Check valve; 24. Converging pipe;

[0030] 3. External pipe; 30. Bend pipe; 31. Water inlet cover; 32. Water inlet cylinder; 33. Support ring; 34. Fixing ring; 341. Mesh disc; 35. Impurity blocking mesh; 351. Blocking cone. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figures 1-4 This utility model provides a technical solution: a cooling structure for the stator winding of a hydro-generator, including a hydro-generator housing 1 and a stator winding 10 disposed inside the hydro-generator housing 1. A water inlet pipe 2 is disposed inside the hydro-generator housing 1. A connector pipe 20 extending out of the hydro-generator housing 1 is fixedly installed at the water inlet end of the water inlet pipe 2. Multiple conductive pipes 21 are fixedly installed on the water inlet pipe 2. A serpentine heat exchange pipe 22 is fixedly installed at the end of the conductive pipe 21, located near the stator winding 10. A water outlet pipe 23 is fixedly installed at the end of the serpentine heat exchange pipe 22. Multiple water outlet pipes 2... The end of the 3 is provided with a collecting pipe 24 for the discharge of water after heat exchange; the connector pipe 20 is provided with an external pipe 3 for the introduction of water flow. The external pipe 3 is connected to the river during the assembly of the water turbine generator, so that the external water source enters the inlet pipe 2 through the external pipe 3 and the connector pipe 20, and then flows to the serpentine heat exchange pipe 22 through the conductor pipe 21. After taking away the heat near the stator winding 10, it is discharged through the outlet pipe 23 and collected in the collecting pipe 24. This allows the cooling water to efficiently take away the heat generated by the stator winding 10, realizing the cooling method of natural water flow circulation, simplifying the cooling system structure and reducing energy consumption.

[0033] like Figure 1 and Figure 2 As shown, a one-way valve 231 is fixedly installed on the water outlet pipe 23. The one-way valve 231 is used for the one-way discharge of water flow, ensuring that the water flow can only flow from the serpentine heat exchange tube 22 through the water outlet pipe 23 to the converging pipe 24 in one direction, so that the cooling water flow is stable and orderly, and the cooling efficiency is reduced due to water backflow. This achieves the function of ensuring the stable operation of the cooling system and improving the cooling effect.

[0034] In this embodiment, a curved pipe 30 is fixedly installed at the water inlet end of the external pipe 3, with the end of the curved pipe 30 facing downstream of the river. A water inlet cover 31 is fixedly installed at the end of the curved pipe 30, and a water inlet cylinder 32 is fixedly installed at the end of the water inlet cover 31. Utilizing the water flow direction and structural design, upstream floating impurities are prevented from entering the curved pipe 30. Simultaneously, the water inlet cover 31 and the water inlet cylinder 32 guide the water flow smoothly into the cooling system. This makes the incoming water to the cooling system purer, reduces damage to the system from impurities, and improves the reliability and service life of the cooling system.

[0035] like Figure 3 and Figure 4 As shown, a detachable impurity blocking net 35 is installed inside the water inlet cylinder 32. The impurity blocking net 35 is used to block impurities in the water. A support ring 33 is fixedly installed on the inner wall of the water inlet cylinder 32, and a fixing ring 34 is fixedly installed on the outside of the impurity blocking net 35. The fixing ring 34 is detachably installed on the end face of the support ring 33 by multiple fastening screws, which can effectively intercept impurities in the water and facilitate regular disassembly and cleaning. This significantly reduces the impurity content of the water entering the cooling system, avoids impurities clogging the pipes and affecting heat exchange, and achieves the purpose of ensuring smooth operation of the cooling system and maintaining good cooling performance.

[0036] like Figure 4 As shown, a perforated plate 341 is fixedly installed on the inner annular side of the fixing ring 34, and an impurity blocking net 35 is fixedly installed on the upper surface of the perforated plate 341, which serves to support the impurity blocking net 35 and enhance the installation stability of the impurity blocking net 35. At the same time, the perforated plate 341 can help disperse the water flow, so that the water flow passes through the impurity blocking net 35 more evenly, making the impurity blocking net 35 firmly installed and not easy to shift or deform. This achieves the effect of ensuring its continuous and effective blocking of impurities and improving the operational stability of the cooling system.

[0037] like Figure 4 As shown, multiple blocking cones 351 are fixedly installed on the impurity blocking mesh 35. The blocking cones 351 are conical in shape, which change the way impurities accumulate on the mesh surface, prevent impurities from completely covering the surface of the impurity blocking mesh 35, maintain the water passage pores on the mesh surface, make the impurity blocking mesh 35 less prone to clogging, maintain good water passage performance, and achieve the effect of ensuring smooth water flow in the cooling system and continuous and efficient heat dissipation.

[0038] It is worth noting that the water inlet cover 31 is located at a higher elevation than the serpentine heat exchange tube 22, and the water inlet cover 31 is set in the upstream river channel, so that the water in the upstream river channel is filtered by the impurity blocking net 35 before entering the serpentine heat exchange tube 22 to achieve heat exchange and cooling operation.

[0039] When using the stator winding cooling structure of the hydro-generator of this utility model, the end of the bent pipe 30 of the outer pipe 3 is oriented towards the downstream of the river, and the water inlet cover 31 is placed in a suitable position in the upstream river channel to ensure that the water inlet cover 31 is higher than the serpentine heat exchange pipe 22. Then, the fixing ring 34 and the support ring 33 are fixed with fastening screws, and the impurity blocking net 35 is installed.

[0040] When the hydro-generator is running, the water in the upstream river flows through the inlet cover 31 and inlet cylinder 32, and is filtered by the impurity blocking net 35 before entering the curved pipe 30. Then, it flows into the inlet pipe 2 through the outer pipe 3 and the joint pipe 20. The water in the inlet pipe 2 is diverted through the conductor pipe 21 to the serpentine heat exchange pipe 22 near the stator winding 10, which carries away the heat generated by the operation of the stator winding 10. After heat exchange, the water flows into the converging pipe 24 through the one-way valve 231 on the outlet pipe 23, thus realizing the cooling and heat dissipation by utilizing the water flow in the river.

[0041] In daily use, it is necessary to regularly check whether the fastening screws are loose, remove the retaining ring 34, and clean the impurities intercepted on the impurity blocking net 35.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A stator winding cooling structure for a hydro-generator, comprising a hydro-generator housing (1) and a stator winding (10) disposed within the hydro-generator housing (1), characterized in that: The turbine generator housing (1) is provided with an inlet pipe (2). The inlet end of the inlet pipe (2) is fixedly installed with a connector pipe (20) that extends out of the turbine generator housing (1). Multiple conductive pipes (21) are fixedly installed on the inlet pipe (2). A serpentine heat exchange pipe (22) is fixedly installed at the end of the conductive pipe (21). The serpentine heat exchange pipe (22) is located near the stator winding (10). An outlet pipe (23) is fixedly installed at the end of the serpentine heat exchange pipe (22). A converging pipe (24) for discharging water after heat exchange is provided at the end of the multiple outlet pipes (23). An external pipe (3) for introducing water is provided on the connector pipe (20).

2. The stator winding cooling structure of the hydro-generator according to claim 1, characterized in that: A one-way valve (231) is fixedly installed on the water outlet pipe (23), and the one-way valve (231) is used for the one-way discharge of water.

3. The stator winding cooling structure of the hydro-generator according to claim 1, characterized in that: The inlet end of the external pipe (3) is fixedly equipped with a curved pipe (30), the end of which faces downstream of the river.

4. The stator winding cooling structure of the hydro-generator according to claim 3, characterized in that: A water inlet cover (31) is fixedly installed at the end of the curved pipe (30), and a water inlet cylinder (32) is fixedly installed at the end of the water inlet cover (31).

5. The stator winding cooling structure of the hydro-generator according to claim 4, characterized in that: The water inlet cylinder (32) is detachably equipped with an impurity blocking net (35), which is used to block impurities in the water.

6. The stator winding cooling structure of the hydro-generator according to claim 5, characterized in that: A support ring (33) is fixedly installed on the inner wall of the water inlet cylinder (32), and a fixing ring (34) is fixedly installed on the outside of the impurity blocking net (35). The fixing ring (34) is detachably installed on the end face of the support ring (33) by a plurality of fastening screws.

7. The stator winding cooling structure of the hydro-generator according to claim 6, characterized in that: A mesh disc (341) is fixedly installed on the inner annular side of the fixing ring (34), and the impurity blocking mesh (35) is fixedly installed on the upper surface of the mesh disc (341).

8. The stator winding cooling structure of the hydro-generator according to claim 7, characterized in that: Multiple blocking cones (351) are fixedly installed on the impurity blocking net (35), and the blocking cones (351) are conical in shape.

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