A water pump water turbine block guide bearing tile support structure and installation method

Abstract

The application provides a water pump water turbine block guide bearing pad support structure and method, and belongs to the field of water pump water turbine manufacturing. The application aims to solve the problems of the existing guide bearing pad, such as unsmooth tilting, easy wearing of the support member, and poor oil wedge bearing of the bearing pad surface. The application comprises a bearing body, a wedge-shaped plate, a thrust support block, a knuckle, a guide bearing pad, a fixing device, and a pad seat. The bearing body and the guide bearing pad are placed in parallel to form a radial space, and the radial space is provided with the wedge-shaped plate, the thrust support block, and the knuckle. The contact surface between the wedge-shaped plate and the bearing body and the contact surface between the knuckle and the guide bearing pad are vertically matched, the contact surface between the wedge-shaped plate and the thrust support block is obliquely matched, and the contact surface between the knuckle and the thrust support block is spherically matched. The bearing body and the wedge-shaped plate are connected through the fixing device. The application effectively solves the problems of the existing guide bearing pad, such as unsmooth tilting, easy wearing of the support member, and poor oil wedge bearing of the bearing pad surface, and improves the bearing capacity of the guide bearing and the stability of the water pump water turbine operation.

Description

Technical Field

[0001] This invention relates to the field of water pump and turbine manufacturing, and in particular to a segmented guide bearing support structure and installation method for water pumps and turbines. Background Technology

[0002] The operating conditions of pump-turbines are complex and variable, and the forward and reverse operation modes place higher demands on the performance of the guide bearings. Traditional pump-turbine segmented guide bearing support structures employ planar contact anti-compression blocks and wedge plates between the bearing pads and the bearing housing, with a full-surface contact bearing seat structure below the bearing pads. This structure uses planar contact between the bearing pads, anti-compression blocks, and wedge plates, resulting in a large contact area with the bearing seat. When the unit experiences changes in stress, the bearing pads do not tilt smoothly and cannot form a self-balancing oil wedge with excellent load-bearing capacity. Furthermore, the complex operating conditions and significant vibrations of pump-turbines increase the vibration of the main shaft and the unit, affecting unit performance.

[0003] In summary, there is an urgent need to design a reliable structure that can improve the tilting flexibility of the guide bearing pad, facilitate the adjustment of the installation clearance between the guide bearing pad and the main shaft, and improve the oil wedge performance of the bearing pad surface. Summary of the Invention

[0004] A brief overview of the invention is given below to provide a basic understanding of certain aspects of it. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0005] In view of this, in order to solve the problems of uneven tilting of existing guide bearing pads, easy wear of support components, and poor bearing capacity of oil wedges on the bearing pad surface, the present invention provides a support structure and installation method for segmented guide bearing pads of water pump turbines.

[0006] Option 1: A segmented guide bearing bearing support structure for a water pump turbine, comprising a bearing body, a wedge plate, a thrust support block, a steering knuckle, a guide bearing bearing, a fixing device, a bearing seat, and a second bolt;

[0007] The bearing body and the guide bearing shell are placed in parallel to form a radial space, and a wedge plate, a thrust support block and a steering knuckle are provided in the radial space;

[0008] The wedge plate and the bearing body, the steering knuckle and the guide bearing shell are all vertically fitted, the wedge plate and the thrust support block are inclinedly fitted, and the steering knuckle and the thrust support block are spherically fitted.

[0009] The bearing body and the wedge plate are connected by a fixing device, which includes a screw, a nut, a pressure plate, a first bolt, and a sleeve. The first bolt fixes the pressure plate to the bearing body, and the screw passes through the pressure plate and the sleeve in sequence to connect with the wedge plate. The screw is fixed above the pressure plate by two nuts.

[0010] The bearing seat is connected to the bearing body by a second bolt.

[0011] Furthermore, the wedge plate and the thrust support block are fitted with a 1:50 inclined plane.

[0012] Furthermore, the distance for the sleeve cutting is calculated based on the installation clearance between the guide bearing shell and the main shaft collar and the 1:50 slope.

[0013] Furthermore, the thrust support block and the steering knuckle surface have a nitrided layer.

[0014] Option 2: An installation method for a segmented guide bearing support structure for a water pump turbine, specifically including the following steps:

[0015] S1. Install the main spindle collar and bearing body into place, and connect the bearing seat to the bearing body using the second bolt;

[0016] S2. Press one side of the guide bearing shell against the main shaft collar, install the steering knuckle and thrust support block on the other side, and then install a wedge plate between the thrust support block and the bearing body;

[0017] S3. The first bolt passes through the pressure plate and connects to the bearing body. Measure the distance from the upper end face of the wedge plate to the lower end face of the pressure plate. Calculate the distance the sleeve should be cut according to the installation clearance between the guide bearing shell and the main shaft collar and the 1:50 slope.

[0018] S4. After the sleeve is cut and installed between the wedge plate and the pressure plate, the screw passes through the pressure plate and the sleeve in sequence and connects to the wedge plate. Two nuts are tightened on the pressure plate and screw to fix it. The installation is complete.

[0019] The present invention has the following advantages over the prior art:

[0020] 1. In this invention, the bearing shell and the bearing seat adopt a non-full-plane contact. The bearing shell reduces the contact area with the bearing seat by relying on the thrust support block and the spherical fit of the steering knuckle, which improves the flexibility of the guide bearing shell tilting and facilitates the formation of an excellent oil wedge shape between the guide bearing shell and the main shaft.

[0021] 2. In the device of the present invention, the thrust support block and the steering knuckle are small-sized components, and surface hardness can be improved by surface processes such as nitriding, thereby increasing the service life of the bearing support structure;

[0022] 3. The device of the present invention can adjust the installation position of the wedge plate by adjusting the installation height of the screw and cutting the sleeve, so as to adjust the installation gap between the guide bearing shell and the main shaft collar;

[0023] 4. The segmented guide bearing bearing support structure of the device of the present invention allows the guide bearing bearing to tilt flexibly according to the forward and reverse rotation of the unit through the spherical support structure during the operation of the water pump turbine. This facilitates the formation of an excellent oil wedge shape between the bearing bearing surface and the main shaft, thereby improving the load-bearing capacity of the guide bearing and the stability of the water pump turbine operation. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 A schematic diagram of a segmented guide bearing support structure for a water pump turbine.

[0026] Figure 2 A partial top view of a segmented guide bearing support structure for a water pump turbine;

[0027] Figure 3 This is the front view after the invention is installed.

[0028] In the diagram: 1-Bearing body, 2-Wedge plate, 3-Thrust support block, 4-Board, 5-Guide bearing shell, 6-Screw, 7-Nut, 8-Pressure plate, 9-First bolt, 10-Sleeve, 11-Bearing seat, 12-Second bolt, 13-Main shaft collar. Detailed Implementation

[0029] To make the technical solutions and advantages of the embodiments of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. 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.

[0030] Example 1, Reference Figure 1-3 This embodiment describes a water pump turbine segmented guide bearing bearing support structure, including a bearing body 1, a wedge plate 2, a thrust support block 3, a steering knuckle 4, a guide bearing bearing 5, a fixing device, a bearing seat 11, and a second bolt 12.

[0031] The bearing body 1 and the guide bearing shell 5 are placed in parallel to form a radial space, and a wedge plate 2, a thrust support block 3 and a steering knuckle 4 are provided in the radial space.

[0032] The wedge plate 2 and the bearing body 1, the steering knuckle 4 and the guide bearing shell 5 are all in vertical fit, the wedge plate 2 and the thrust support block 3 are in inclined fit, and the steering knuckle 4 and the thrust support block 3 are in spherical fit.

[0033] The bearing body 1 and the wedge plate 2 are connected by a fixing device, which includes a screw 6, a nut 7, a pressure plate 8, a first bolt 9, and a sleeve 10. The first bolt 9 fixes the pressure plate 8 on the bearing body 1. The screw 6 passes through the pressure plate 8 and the sleeve 10 in sequence and is connected to the wedge plate 2. The screw 6 is fixed above the pressure plate 8 by two nuts 7.

[0034] The bearing seat 11 is connected to the bearing body 1 by a second bolt 12.

[0035] Furthermore, the wedge plate 2 and the thrust support block 3 are fitted with a 1:50 inclined plane.

[0036] Furthermore, the cutting distance of the sleeve 10 is calculated based on the installation gap between the guide bearing shell 5 and the main shaft collar 13 and the 1:50 slope.

[0037] Furthermore, the surfaces of the thrust support block 3 and the steering knuckle 4 have a nitrided layer.

[0038] Example 2: An installation method for a segmented guide bearing support structure for a water pump turbine, specifically including the following steps:

[0039] S1. The main spindle collar 13 and bearing body 1 are installed in place, and the bearing seat 11 is connected to the bearing body 1 by the second bolt 12;

[0040] S2. Press one side of the guide bearing shell 5 against the main shaft collar 13, and install the steering knuckle 4 and thrust support block 3 on the other side. Then install the wedge plate 2 between the thrust support block 3 and the bearing body 1.

[0041] S3. The first bolt 9 passes through the pressure plate 8 and connects to the bearing body 1. Measure the distance from the upper end face of the wedge plate 2 to the lower end face of the pressure plate 8. Calculate the distance that the sleeve 10 should be cut according to the installation gap between the guide bearing shell 5 and the main shaft collar 13 and the 1:50 slope.

[0042] S4. After the sleeve 10 is cut and installed between the wedge plate 2 and the pressure plate 8, the screw 6 passes through the pressure plate 8 and the sleeve 10 in sequence and connects with the wedge plate 2. The two nuts 7 are tightened and fixed above the pressure plate 8 and the screw 6. The installation is complete.

[0043] Through this invention, the bearing shell and the bearing seat adopt a non-full-plane contact. The bearing shell reduces the contact area with the bearing seat by relying on the spherical fit of the thrust support block and the steering knuckle, which improves the flexibility of the guide bearing shell tilting and facilitates the formation of an excellent oil wedge shape between the guide bearing shell and the main shaft. At the same time, the thrust support block and the steering knuckle in this device are small-sized parts, and surface processes such as nitriding can be used to improve the surface hardness and increase the service life of the bearing shell support structure.

[0044] This invention enables the guide bearing pads to tilt flexibly according to the forward and reverse rotation of the unit during the operation of the water pump turbine through the spherical support structure. This facilitates the formation of an excellent oil wedge shape between the bearing pad surface and the main shaft, thereby improving the load-bearing capacity of the guide bearing and the stability of the water pump turbine operation.

[0045] Although the invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and instructional purposes, and not for the purpose of interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A segmented guide bearing bearing support structure for a water pump turbine, characterized in that, It includes a bearing body (1), a wedge plate (2), a thrust support block (3), a steering knuckle (4), a guide bearing shell (5), a fixing device, a shell seat (11), and a second bolt (12); The bearing body (1) and the guide bearing shell (5) are placed in parallel to form a radial space, and a wedge plate (2), a thrust support block (3) and a steering knuckle (4) are provided in the radial space; The wedge plate (2) and the bearing body (1), the steering knuckle (4) and the guide bearing shell (5) are all vertically fitted, the wedge plate (2) and the thrust support block (3) are inclinedly fitted, and the steering knuckle (4) and the thrust support block (3) are spherically fitted. The bearing body (1) and the wedge plate (2) are connected by a fixing device, which includes a screw (6), a nut (7), a pressure plate (8), a first bolt (9), and a sleeve (10). The first bolt (9) fixes the pressure plate (8) on the bearing body (1). The screw (6) passes through the pressure plate (8) and the sleeve (10) in sequence and is connected to the wedge plate (2). The screw (6) is fixed above the pressure plate (8) by two nuts (7). The bearing seat (11) is connected to the bearing body (1) by a second bolt (12).

2. The pump-turbine segmented guide bearing bearing support structure according to claim 1, characterized in that, The wedge plate (2) and the thrust support block (3) are fitted with a 1:50 inclined plane.

3. The pump-turbine segmented guide bearing bearing support structure according to claim 1, characterized in that, The distance of the sleeve (10) is calculated based on the installation gap between the guide bearing shell (5) and the main shaft collar (13) and the 1:50 slope.

4. The pump-turbine segmented guide bearing bearing support structure according to claim 1, characterized in that, The surfaces of the thrust support block (3) and the steering knuckle (4) have a nitrided layer.

5. A method for installing the segmented guide bearing bearing support structure for a water pump turbine as described in claim 1, characterized in that, Specifically, the following steps are included: S1. The main shaft collar (13) and the bearing body (1) are installed in place, and the bearing seat (11) is connected to the bearing body (1) by the second bolt (12); S2. Place one side of the guide bearing shell (5) close to the main shaft collar (13), and install the steering knuckle (4) and thrust support block (3) on the other side. Then install a wedge plate (2) between the thrust support block (3) and the bearing body (1). S3. The first bolt (9) passes through the pressure plate (8) and connects to the bearing body (1). Measure the distance from the upper end face of the wedge plate (2) to the lower end face of the pressure plate (8). Calculate the distance that the sleeve (10) should be cut according to the installation gap between the guide bearing shell (5) and the main shaft collar (13) and the 1:50 slope. S4. After the sleeve (10) is cut, it is installed between the wedge plate (2) and the pressure plate (8). The screw (6) passes through the pressure plate (8) and the sleeve (10) in sequence and is connected to the wedge plate (2). Two nuts (7) are tightened and fixed above the pressure plate (8) and the screw (6). The installation is completed.

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