A water turbine generator inner and outer double circulation switchable guide bearing structure

Abstract

The utility model discloses a kind of water turbine generator internal and external double-cycle switchable guide bearing structure, it is related to water turbine generator field.Once the internal circulation cooler leaks, oil tank is opened to overhaul oil cooler after oil discharge, seriously affect the total power generation of water turbine generator, in addition pump external circulation cooling system although can handle leakage problem outside machine pit, need not open oil tank, but because of additional configuration oil pump increase power station energy consumption and operating cost.The utility model includes rotating shaft, oil tank, guide tile, internal circulation oil cooler, internal circulation oil cooler water inlet pipe, internal circulation oil cooler water outlet pipe, external circulation oil inlet pipe branch pipe, external circulation oil inlet pipe ring pipe, external circulation oil inlet pipe main pipe, external circulation oil outlet pipe, additional pump external circulation device.The utility model has internal circulation cooling system and additional pump external circulation cooling system, can realize internal and external loop switching, greatly reduce shutdown loss, realize the dual protection of low cost and high reliability, provide strong support for power station efficient operation and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of hydro-generators, and in particular to a hydro-generator internal and external dual-circulation switchable guide bearing structure. Background Technology

[0002] There are generally two types of lubricating oil cooling systems for hydro-generator guide bearings. One type involves the lubricating oil circulating within an oil sump and being cooled by an oil cooler, known as an internal circulation cooling system. The other type involves drawing hot lubricating oil from the sump using an external pump, cooling it in an external cooler, and then returning it to the sump, known as an external pump external circulation cooling system. While the internal circulation cooling system is simpler and easier to maintain, leaks in the cooler require draining the oil and opening the oil sump for repairs, severely impacting the overall power generation of the hydro-generator. The external pump external circulation cooling system, while allowing for leak repairs outside the turbine pit without opening the oil sump, increases the power plant's energy consumption and operating costs due to the additional oil pump.

[0003] ‌ Utility Model Content

[0004] The purpose of this utility model is to overcome the problem that once the cooler leaks water, it is necessary to drain the oil and open the oil tank to repair the oil cooler, which seriously affects the total power generation of the hydro generator. Although the external circulation cooling system with an external pump can deal with the water leakage problem outside the pit without opening the oil tank, it increases the power station's energy consumption and operating costs due to the additional oil pump. This utility model provides a hydro generator with a switchable internal and external circulation guide bearing structure.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] A switchable internal and external circulation guide bearing structure for a hydro-generator includes a shaft, an oil trough, guide bearings, an internal circulation oil cooler, an internal circulation oil cooler inlet pipe, an internal circulation oil cooler outlet pipe, an external circulation oil inlet branch pipe, an external circulation oil inlet ring pipe, an external circulation oil inlet main pipe, an external circulation oil discharge pipe, and an external circulation pump. The oil trough is located on the outer side of the shaft, and the guide bearings are fixed to the oil trough. There is an operating clearance between the guide bearings and the shaft. The oil trough is equipped with an internal circulation oil cooler. Below the guide plate, the internal circulation oil cooler is connected to the water tank outside the oil tank through the internal circulation oil cooler inlet pipe and the internal circulation oil cooler outlet pipe. An external circulation oil inlet ring pipe is provided on the inner diameter side of the oil tank. An external circulation oil inlet branch pipe is provided on the external circulation oil inlet ring pipe. The external pump external circulation device is placed outside the oil tank. An oil inlet and an oil outlet are provided on the external pump external circulation device. The oil outlet is connected to the external circulation oil inlet ring pipe through the external circulation oil inlet main pipe. The oil inlet is connected to the oil tank through the external circulation oil drain pipe.

[0007] Furthermore, the internal circulation oil cooler inlet pipe is equipped with an internal circulation oil cooler inlet pipe valve, the internal circulation oil cooler outlet pipe is equipped with an internal circulation oil cooler outlet pipe valve, the external circulation oil inlet main pipe is equipped with an external circulation oil inlet main pipe valve, and the external circulation oil outlet pipe is equipped with an external circulation oil outlet valve.

[0008] Furthermore, the number of external circulation oil inlet pipe branches is the same as the number of guide bearings, and the external circulation oil inlet pipe branches are close to the guide bearings.

[0009] The beneficial effects of this utility model are:

[0010] 1. This utility model enables switching between internal and external circulation. It features both an internal circulation cooling system and an external pump external circulation cooling system, allowing for switching between internal and external circulation. This significantly reduces downtime losses, achieving a dual guarantee of low cost and high reliability, and providing strong support for efficient power plant operation and maintenance.

[0011] 2. In this utility model, the number of branch pipes of the external circulation oil inlet pipe is equal to the number of guide bearings and the branch pipes are close to the guide bearings, which can make the cold oil enter the contact surface between the guide bearings and the rotating shaft evenly, effectively remove oil film loss and reduce the temperature of the guide bearings.

[0012] 3. In this utility model, the inlet valve of the internal circulation oil cooler, the outlet valve of the internal circulation oil cooler, the main valve of the external circulation oil inlet pipe, and the external circulation oil outlet pipe valve can separate the internal circulation and the external circulation, so that they do not interfere with each other and are independent. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram showing the installation of the external circulation oil inlet pipe ring and the external circulation oil inlet pipe branch.

[0015] In the diagram: 1-Shaft; 2-Oil tank; 3-Guide bearing; 4-Internal circulation oil cooler; 5-Internal circulation oil cooler inlet pipe; 6-Internal circulation oil cooler inlet pipe valve; 7-Internal circulation oil cooler outlet pipe; 8-Internal circulation oil cooler outlet pipe valve; 9-External circulation oil inlet branch pipe; 10-External circulation oil inlet ring pipe; 11-External circulation oil inlet main pipe; 12-External circulation oil inlet main pipe valve; 13-External circulation oil drain pipe; 14-External circulation oil drain pipe valve; 15-External circulation device with external pump. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0017] Example:

[0018] like Figure 1-2 As shown, this utility model provides a switchable internal and external dual-circulation guide bearing structure for a hydro-generator, including a rotating shaft 1, an oil trough 2, guide bearings 3, an internal circulation oil cooler 4, an internal circulation oil cooler inlet pipe 5, an internal circulation oil cooler outlet pipe 7, an external circulation oil inlet branch pipe 9, an external circulation oil inlet ring pipe 10, an external circulation oil inlet main pipe 11, an external circulation oil discharge pipe 13, and an external pump external circulation device 15. An oil trough 2 is provided on the outer side of the rotating shaft 1, and the guide bearings 3 are fixed on the oil trough 2. The guide bearings 3 have a running clearance close to the rotating shaft 1. The oil trough 2 is equipped with an internal circulation oil cooler 4. The cooler 4 is located below the guide plate 3. The internal circulation oil cooler 4 is connected to the water tank outside the oil tank 2 through the internal circulation oil cooler inlet pipe 5 and the internal circulation oil cooler outlet pipe 7. An external circulation oil inlet pipe ring 10 is provided on the inner diameter side of the oil tank 2. An external circulation oil inlet pipe branch pipe 9 is provided on the external circulation oil inlet pipe ring 10. The external pump external circulation device 15 is located outside the oil tank 2. An oil inlet and an oil outlet are provided on the external pump external circulation device 15. The oil outlet is connected to the external circulation oil inlet pipe ring 10 through the external circulation oil inlet pipe main pipe 11. The oil inlet is connected to the oil tank 2 through the external circulation oil drain pipe 13.

[0019] Specifically, the internal circulation oil cooler inlet pipe 5 is equipped with an internal circulation oil cooler inlet pipe valve 6, the internal circulation oil cooler outlet pipe 7 is equipped with an internal circulation oil cooler outlet pipe valve 8, the external circulation oil inlet main pipe 11 is equipped with an external circulation oil inlet main pipe valve 12, and the external circulation oil drain pipe 13 is equipped with an external circulation oil drain pipe valve 14.

[0020] Specifically, the number of external circulation oil inlet pipe branches 9 and guide bearings 3 is the same, and the external circulation oil inlet pipe branches 9 are close to the guide bearings 3.

[0021] In this embodiment, the internal circulation cooling system is prioritized for daily operation to ensure low-cost and stable operation. When the internal circulation oil cooler 4 malfunctions, the old oil can be quickly drained and new oil injected through the external circulation cooling system with an external pump. After that, the oil cooler 4 can be shut off, and the lubricating oil can be cooled by the external circulation cooling system with an external pump. This allows the unit to maintain continuous power generation without opening the oil tank 2. Once maintenance conditions are met, the oil tank 2 can be opened to repair the oil cooler of the internal circulation cooling system. After maintenance is completed, the external circulation cooling system with an external pump can be shut off, and the internal circulation cooling system can be restored to operation.

[0022] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A switchable guide bearing structure for internal and external dual circulation of a hydro-generator, characterized in that, The system includes a rotating shaft (1), an oil tank (2), guide bearings (3), an internal circulating oil cooler (4), an internal circulating oil cooler inlet pipe (5), an internal circulating oil cooler outlet pipe (7), an external circulating oil inlet branch pipe (9), an external circulating oil inlet ring pipe (10), an external circulating oil inlet main pipe (11), an external circulating oil drain pipe (13), and an external pump external circulation device (15). The rotating shaft (1) is provided with an oil tank (2) on its outer side. The guide bearings (3) are fixed on the oil tank (2). There is a running gap between the guide bearings (3) and the rotating shaft (1). The oil tank (2) is provided with an internal circulating oil cooler (4), which is located below the guide bearings (3). The internal circulation oil cooler (4) is connected to the water tank outside the oil tank (2) through the internal circulation oil cooler inlet pipe (5) and the internal circulation oil cooler outlet pipe (7). An external circulation oil inlet ring pipe (10) is provided on the inner diameter side of the oil tank (2). An external circulation oil inlet branch pipe (9) is provided on the external circulation oil inlet ring pipe (10). The external pump external circulation device (15) is placed outside the oil tank (2). An oil inlet and an oil outlet are provided on the external pump external circulation device (15). The oil outlet is connected to the external circulation oil inlet ring pipe (10) through the external circulation oil inlet main pipe (11). The oil inlet is connected to the oil tank (2) through the external circulation oil drain pipe (13).

2. The hydro-generator internal and external dual-circulation switchable guide bearing structure according to claim 1, characterized in that: The internal circulation oil cooler inlet pipe (5) is equipped with an internal circulation oil cooler inlet pipe valve (6), the internal circulation oil cooler outlet pipe (7) is equipped with an internal circulation oil cooler outlet pipe valve (8), the external circulation oil inlet pipe main pipe (11) is equipped with an external circulation oil inlet pipe main pipe valve (12), and the external circulation oil drain pipe (13) is equipped with an external circulation oil drain pipe valve (14).

3. The hydro-generator internal and external dual-circulation switchable guide bearing structure according to claim 1, characterized in that: The number of external circulation oil inlet pipe branch pipes (9) and guide bearings (3) is the same, and the external circulation oil inlet pipe branch pipes (9) are close to the guide bearings (3).

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