Horizontal water turbine generator bearing high-pressure oil jacking device and assembling method thereof

Abstract

This invention relates to the field of hydro-generator technology and discloses a high-pressure oil jacking device for a horizontal hydro-generator bearing. The device includes a generator bearing housing, a bearing, an upper bearing shell, a lower guide bearing shell, and a thrust bearing shell. The upper bearing shell, lower guide bearing shell, and thrust bearing shell are mounted on the generator bearing housing. The bearing is located between the upper bearing shell and the lower guide bearing shell. The device is characterized by having a nozzle jacking device at the bottom of the lower guide bearing shell, with the nozzle jacking device facing upwards and aligned with the bearing. This effectively prevents the bearing shell temperature from rising sharply or even burning out, significantly reducing the probability of unplanned unit shutdowns.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator technology, specifically to a high-pressure oil jacking device for a horizontal hydro-generator bearing and its assembly method. Background Technology

[0002] Horizontal large-scale hydro-turbine generators are the core power generation equipment of low-head hydropower stations. Their rotors typically weigh tens or even hundreds of tons. During the start-up and shutdown of the unit, when the speed is lower than the critical speed, a sufficiently thick hydrodynamic oil film cannot be formed between the bearing and the journal. Dry or semi-dry friction is very likely to occur, causing the bearing temperature to rise sharply or even burn out. This forces the unit to be shut down for maintenance without planning, resulting in huge economic losses and safety hazards to the power station.

[0003] Chinese patent document CN116428278B discloses an internal circulation structure for a guide bearing, including an oil tank, a cooler, a bearing housing, guide bearing pads, and a sliding rotor that rotates with the main shaft. The guide bearing pads are mounted on the bearing housing, and the bearing housing is mounted on the oil tank. The structure is characterized by further including a viscous pump plate and a guide bearing support ring. The viscous pump plate is fixed to the bottom of the guide bearing support ring and corresponds to the lower plane of the sliding rotor. The guide bearing support ring has an oil collecting chamber with its opening facing the sliding rotor. Multiple radial oil guide holes are provided on the outer side of the oil collecting chamber, communicating with the oil collecting chamber. An oil injection pipe is provided between two adjacent guide bearing pads, and the upper part of the radial oil guide holes is connected to the oil injection pipe. An oil drain port is provided on the bearing housing.

[0004] The existing technology has the following shortcomings: Although it improves the internal circulation lubrication effect of the guide bearing to a certain extent and reduces the bearing temperature during normal operation of the unit, it still cannot fundamentally solve the problem of bearing burnout during the start-up and shutdown phases of the unit. Summary of the Invention

[0005] To address the technical problem of bearing burnout during generator start-up and shutdown, this invention provides a high-pressure oil jacking device for horizontal hydro-generator bearings. The device includes a generator bearing housing, a rotating part, an upper bearing shell, a lower guide bearing shell, and a thrust bearing shell. The upper bearing shell, lower guide bearing shell, and thrust bearing shell are mounted on the generator bearing housing. The rotating part is located between the upper bearing shell and the lower guide bearing shell. The device is characterized by having a nozzle jacking device at the bottom of the lower guide bearing shell, with the nozzle jacking device aligned upwards with the axis of the rotating part.

[0006] To facilitate lifting the rotating part, the nozzle lifting device includes a high-pressure nozzle, a connector, an elbow, and a high-pressure pipeline. The high-pressure nozzle is connected to the high-pressure pipeline through the connector and the elbow. The high-pressure pipeline is used to connect to the thin oil station.

[0007] Preferably, the pressure of the lubricating fluid in the high-pressure nozzle during the start-up and shutdown phases of the unit is 8-10 MPa.

[0008] Preferably, the generator bearing housing has an inner flange connection structure on its inner side, and the inner flange connection structure is installed and connected to the high-pressure pipeline.

[0009] Preferably, the generator bearing housing is provided with an outer flange connection structure on the outside, and the outer flange connection structure is assembled and connected with the inner flange connection structure.

[0010] An assembly method for a high-pressure oil jacking device for a horizontal hydro-generator bearing, characterized by comprising the following steps: Step 1: Install the generator bearing housing and the lower guide bearing shell; Step 2: Based on the rotating part and the lower guide bearing, install the upper bearing and thrust bearing. Step 3: Install the bearing seal cover and bearing shell temperature measuring device; Step 4: Connect the high-pressure nozzle to the lower interface of the lower guide bearing shell, and then install the high-pressure pipeline and connectors. Step 5: Assemble the inner flange connection structure on the inner side of the generator bearing housing and connect it to the pipeline. Step 6: Install and connect the outer flange connection structure on the outside of the generator bearing housing for connection with the external oil supply station.

[0011] Furthermore, in step 4, the lower interface of the lower guide bearing is cleaned, the high-pressure nozzle assembly is connected first, and then the high-pressure pipeline, flared straight pipe joint and right-angle elbow are installed.

[0012] Furthermore, in step 5, the inner flange connection structure inside the generator bearing housing is assembled. The inner flange connection structure includes an inner flange, an insulating gasket, a rubber gasket, bolts, and washers, and the inner flange is installed and connected to the high-pressure pipeline.

[0013] Furthermore, in step 6, the outer flange connection structure includes an outer flange, a rubber gasket, bolts, and washers. The outer flange is installed and connected to the generator bearing housing, and the outer flange is assembled with the inner flange.

[0014] The present invention has the following beneficial effects: 1. This invention fundamentally solves the problem of bearing burnout during the start-up and shutdown phases of horizontal large-scale hydro-generators. By installing a nozzle lifting device at the bottom of the lower guide bearing bearing, which is aligned upwards with the rotating part, high-pressure lubricating oil is sprayed from the nozzle during the low-speed phases of unit startup and shutdown to form a stable high-pressure oil film. This lifts the rotor shaft, which weighs tens or even hundreds of tons, to a certain height, completely avoiding dry and semi-dry friction between the journal and the bearing. This effectively prevents the bearing temperature from rising sharply or even burning out, and significantly reduces the probability of unplanned unit shutdowns.

[0015] 2. Improved unit operation safety and on-site working conditions. This invention completely eliminates the safety hazards caused by bearing burnout, improving the safety and stability of the hydro-generator unit. Simultaneously, the standardized and modular assembly process reduces complex operations and high-altitude work time for on-site assembly personnel, lowers safety risks during construction, and improves the occupational health of workers. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the lower guide bearing bearing shell; Figure 2 This is a schematic diagram showing the installation of the upper bearing shell, lower guide bearing shell, and thrust bearing shell. Figure 3 This is a schematic diagram of an embodiment of the high-pressure oil jacking device for the bearing of a horizontal hydro-generator according to the present invention. Detailed Implementation

[0017] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: generator bearing housing 1, rotating part 2, upper bearing shell 3, lower guide bearing shell 4, thrust bearing shell 5, nozzle lifting device 6, high-pressure nozzle 601, connector 602, elbow 603, high-pressure pipeline 604, inner flange connection structure 7, inner flange 701, outer flange connection structure 8, outer flange 801, bearing sealing cover 9, bearing shell temperature measuring device 10.

[0018] Example 1 like Figure 1-3 As shown, a high-pressure oil jacking device for a horizontal hydro-generator bearing includes a generator bearing housing 1, a rotating part 2, an upper bearing shell 3, a lower guide bearing shell 4, and a thrust bearing shell 5. The upper bearing shell 3, the lower guide bearing shell 4, and the thrust bearing shell 5 are mounted on the generator bearing housing 1. The rotating part 2 is located between the upper bearing shell 3 and the lower guide bearing shell 4. The device is characterized in that a nozzle jacking device 6 is provided at the bottom of the lower guide bearing shell 4, and the nozzle jacking device 6 is aligned upwards with the rotating part 2.

[0019] The nozzle lifting device 6 includes a high-pressure nozzle 601, a connector 602, an elbow 603, and a high-pressure pipeline 604. The high-pressure nozzle 601 is connected to the high-pressure pipeline 604 through the connector 602 and the elbow 603. The high-pressure pipeline 604 is used to connect to a thin oil station.

[0020] The pressure of the lubricating fluid in the high-pressure nozzle 601 is 10 MPa during the start-up and shutdown phases of the unit.

[0021] The generator bearing housing 1 is provided with an inner flange connection structure 7, which is installed and connected to the high-pressure pipeline 604.

[0022] The generator bearing housing 1 is provided with an outer flange connection structure 8 on the outside, and the outer flange connection structure 8 is assembled and connected with the inner flange connection structure 7.

[0023] An assembly method for a high-pressure oil jacking device for a horizontal hydro-generator bearing includes the following steps: Step 1: Install the generator bearing housing 1 and the lower guide bearing shell 4; Step 2: Based on the rotating part 2 and the lower guide bearing 4, install the upper bearing 3 and the thrust bearing 5; Step 3: Install the bearing sealing cover 9 and the bearing shell temperature measuring device 10; Step 4: Connect the high-pressure nozzle 601 to the lower interface of the lower guide bearing 4, and then install the high-pressure pipeline 604 and the connector 602. Step 5: Assemble the inner flange connection structure 7 on the inner side of the generator bearing housing 1 and connect it to the pipeline. Step 6: Install and connect the outer flange connection structure 8 on the outside of the generator bearing housing 1 for connection with the external oil supply station.

[0024] In step 4, clean the lower interface of the lower guide bearing 4, first connect the high-pressure nozzle 601 for assembly, and then install the high-pressure pipeline 604, the flared straight pipe joint 602 and the right-angle elbow 603.

[0025] In step 5, the inner flange connection structure 7 is assembled on the inner side of the generator bearing housing 1. The inner flange connection structure 7 includes an inner flange 701, an insulating gasket, a rubber gasket, bolts, and washers. The inner flange 701 is installed and connected to the high-pressure pipeline 604.

[0026] In step 6, the outer flange connection structure 8 includes an outer flange 801, a rubber gasket, bolts, and washers. The outer flange 801 is installed and connected to the generator bearing housing 1, and the outer flange 801 is assembled with the inner flange 701.

[0027] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A high-pressure oil jacking device for a horizontal hydro-generator bearing, comprising a generator bearing housing, a rotating part, an upper bearing shell, a lower guide bearing shell, and a thrust bearing shell, wherein the upper bearing shell, the lower guide bearing shell, and the thrust bearing shell are mounted on the generator bearing housing, and the rotating part is located between the upper bearing shell and the lower guide bearing shell, characterized in that, The bottom of the lower guide bearing is provided with a nozzle lifting device, which is arranged upwards and aligned with the axis of the rotating part.

2. The high-pressure oil jacking device for the bearings of a horizontal hydro-generator according to claim 1, characterized in that: The nozzle lifting device includes a high-pressure nozzle, a connector, an elbow, and a high-pressure pipeline. The high-pressure nozzle is connected to the high-pressure pipeline through the connector and the elbow. The high-pressure pipeline is used to connect to the thin oil station.

3. The high-pressure oil jacking device for the bearing of a horizontal hydro-generator according to claim 2, characterized in that: The generator bearing housing is provided with an inner flange connection structure, which is installed and connected to the high-pressure pipeline.

4. The high-pressure oil jacking device for the bearing of a horizontal hydro-generator according to claim 3, characterized in that: The generator bearing housing is provided with an outer flange connection structure on the outside, and the outer flange connection structure is assembled and connected with the inner flange connection structure.

5. The high-pressure oil jacking device for the bearing of a horizontal hydro-generator according to claim 4, characterized in that: The pressure of the lubricating fluid in the high-pressure nozzle is 8-10 MPa during the start-up and shutdown phases of the unit.

6. A method for assembling a high-pressure oil jacking device for a horizontal hydro-generator bearing as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Install the generator bearing housing and the lower guide bearing shell; Step 2: Based on the rotating part and the lower guide bearing, install the upper bearing and thrust bearing. Step 3: Install the bearing seal cover and bearing shell temperature measuring device; Step 4: Connect the high-pressure nozzle to the lower interface of the lower guide bearing shell, and then install the high-pressure pipeline and connectors; Step 5: Assemble the inner flange connection structure on the inner side of the generator bearing housing and connect it to the pipeline. Step 6: Install and connect the outer flange connection structure on the outside of the generator bearing housing for connection with the external oil supply station.

7. The assembly method of the high-pressure oil jacking device for the bearing of a horizontal hydro-generator according to claim 6, characterized in that: In step 4, clean the lower interface of the lower guide bearing shell, first connect the high-pressure nozzle assembly, and then install the high-pressure pipeline, flared straight pipe joint and right-angle elbow.

8. The assembly method of the high-pressure oil jacking device for the bearing of a horizontal hydro-generator according to claim 7, characterized in that: In step 5, the inner flange, insulating gasket, rubber gasket, bolts, and washers are assembled on the inner side of the generator bearing housing, and the inner flange is installed and connected to the high-pressure pipeline.

9. The assembly method of the high-pressure oil jacking device for the bearing of a horizontal hydro-generator according to claim 8, characterized in that: In step 6, the outer flange, rubber gasket, bolts, and washers are installed and connected to the generator bearing housing, and assembled with the inner flange on the inner side of the generator bearing and connected to the high-pressure pipeline.

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