Thrust support combined bearing for steam turbine

Abstract

The utility model discloses a thrust and support combined bearing for a steam turbine, which relates to the field of bearing structures and comprises a support bearing, a plurality of thrust pads are mounted on two sides of the support bearing, and elastic backing rings are arranged between the thrust pads and the support bearing. The direction from the face where the thrust pad is arranged to the face where the elastic backing ring is arranged is in the axis direction of the supporting bearing. The thrust and support combined bearing disclosed by the utility model has the advantages that the load uniformity is good, the problem of uneven bearing temperature is effectively solved, the problem of large axial space of a load balancing block thrust bearing is solved, and the bearing has the advantage of small axial space.

Description

Technical Field

[0001] This utility model relates to the field of bearing structure, and in particular to a thrust support combined bearing for steam turbines. Background Technology

[0002] Thrust support combined bearings for steam turbines are mainly used to balance axial thrust and support the steam turbine rotor. Currently, the thrust support combined bearings used in the industry include: (1) combined bearings consisting of a support bearing and a fixed bearing thrust bearing. Due to the poor load distribution of the fixed bearing thrust bearing, uneven bearing temperature is easily generated; (2) combined bearings consisting of a support bearing and a tilting bearing thrust bearing without a load distribution block. Due to the poor load distribution of the thrust bearing, uneven bearing temperature is easily generated; (3) combined bearings consisting of a support bearing and a tilting bearing thrust bearing with a load distribution block. Due to the presence of upper and lower load distribution blocks, the axial space of the thrust bearing is larger, which increases the length of the shaft system arrangement.

[0003] Therefore, a new thrust-supported combined bearing scheme is needed. Utility Model Content

[0004] The purpose of this utility model is to provide a thrust support combined bearing for steam turbines that addresses the above-mentioned problems. It has good load distribution, effectively solves the problem of uneven bearing temperature, and addresses the problem of large axial space in the load distribution block thrust bearing, thus giving the bearing the advantage of small axial space.

[0005] The technical solution adopted by this utility model is as follows: a thrust support combined bearing for a steam turbine, including a support bearing, with multiple thrust pads installed on both sides of the support bearing, and an elastic washer between the thrust pads and the support bearing, and the direction from the surface where the thrust pads are arranged to the surface where the elastic washer is arranged is along the axial direction of the support bearing.

[0006] Furthermore, the multiple thrust bearings are arranged in a circumferential array centered on the axis of the supporting bearing.

[0007] Furthermore, the support bearing includes a bearing body and a bearing sleeve, with the bearing sleeve fitted onto the outer surface of the bearing body.

[0008] Furthermore, the tile body and the tile sleeve are fitted together by a spherical joint, and there is a key between the tile body and the tile sleeve, with one end of the key located inside the tile sleeve and the other end located inside the tile body.

[0009] Furthermore, the thrust pad is mounted on the elastic washer ring via a first pin and a second pin. The axes of the first pin and the second pin are along the axial direction of the pad body, and the elastic washer ring is radially fitted with the pad body to achieve the assembly of the elastic washer ring in the pad body.

[0010] Furthermore, the tile body is provided with an oil inlet and an oil channel is present inside the tile body. One end of the oil channel penetrates the inner wall of the tile body, and the other end of the oil channel is connected to the oil inlet.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0012] This invention uses tiltable pads as thrust pads, combined with elastic washers as load-sharing blocks, to effectively improve the load-sharing uniformity of all thrust pads, thereby reducing uneven temperature distribution. At the same time, the elastic washers have compressibility and are designed with a thickness much smaller than that of the load-sharing blocks, further reducing the axial dimension of the entire thrust support bearing and minimizing the axial space occupied after installation. Attached Figure Description

[0013] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Markings in the diagram: 1-Sleeve; 2-Sleeve body; 3-Thrust bearing; 4-Elastic washer ring; 5-First pin; 6-Second pin; 7-Pin key; 8-Oil inlet; 9-Oil passage. Detailed Implementation

[0016] In the description of this specification, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0017] Furthermore, the use of terms such as "horizontal" or "vertical" in this specification does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0018] In the description of this specification, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” should be interpreted broadly. For example, a link can be a fixed link, a detachable link, or an integral link; it can be a mechanical link or an electrical link; it can be a direct link or an indirect link through an intermediate medium; it can be a connection within two components.

[0019] Example 1

[0020] like Figure 1 As shown, a thrust support combined bearing for a steam turbine includes a support bearing. One side of the support bearing is close to the steam turbine and is the steam turbine side; the other side of the support bearing is close to the motor and is the motor side. Both the steam turbine side and the motor side have the same arrangement, that is, multiple thrust pads 3 are installed on both sides of the support bearing. There is an elastic washer 4 between the thrust pads 3 and the support bearing, and the direction from the surface where the thrust pads 3 are arranged to the surface where the elastic washer 4 is arranged is along the axial direction of the support bearing.

[0021] In this embodiment, the thrust support combined bearing disclosed herein, compared to the thrust support combined bearing described in the background art, simply replaces the load-equalizing block with an elastic washer 4. By using tilting pads as thrust pads 3, and in conjunction with the elastic washer 4 as a load-equalizing block, the load-equalizing performance of all thrust pads 3 is effectively improved, thereby reducing the phenomenon of uneven pad temperature in the thrust pads 3. At the same time, the elastic washer 4 has compressibility and its design thickness is much smaller than that of the load-equalizing block, further reducing the axial dimension of the entire thrust support combined bearing and reducing the axial space occupied after the thrust support combined bearing is installed.

[0022] It should be noted that the thrust bearing 3 is a tilting bearing, and its working principle is known to those skilled in the art. As described above, the innovation of the solution disclosed in this embodiment is that the elastic pad ring 4 is replaced with the load-equalizing block. The structures not described in this specification are all structures known to those skilled in the art, that is, the same as the existing thrust support combined bearing structure described in the background art. Therefore, they will not be described in detail in this specification.

[0023] Example 2

[0024] Based on Example 1, further feasible implementation methods are proposed.

[0025] One feasible implementation is that multiple thrust bearings 3 are arranged in a circumferential array with the axis of the support bearing as the center, so that when the thrust bearings 3 are subjected to axial thrust, they can be evenly supported and evenly transmitted to the support bearing, avoiding torque on the support bearing and affecting stability.

[0026] In one feasible implementation, the support bearing includes a bearing body 2 and a bearing sleeve 1. The bearing sleeve 1 is fitted onto the outer surface of the bearing body 2, which facilitates the installation of the support bearing and makes the installation of the thrust support combined bearing convenient. At the same time, the bearing sleeve 1 effectively protects the bearing body 2.

[0027] In one feasible implementation, the tile body 2 and the tile sleeve 1 are connected by a pin 7, with one end of the pin 7 located inside the tile sleeve 1 and the other end of the pin 7 located inside the tile body 2, thereby improving the connection stability between the tile body 2 and the tile sleeve 1.

[0028] In one feasible implementation, the thrust pad 3 is mounted on the elastic washer 4 via a first pin 5 and a second pin 6. The axes of the first pin 5 and the second pin 6 are along the axial direction of the pad body 2. The elastic washer 4 is fitted radially against the pad body 2 to achieve an overfit, ensuring the stability of the elastic washer 4 assembly. The first pin 5 and the second pin 6 restrict the movement of the thrust pad 3 in the radial and axial directions without affecting its operation as a tilting pad. Furthermore, the elastic washer 4 can be compressed in the axial direction when subjected to axial thrust, buffering the axial thrust on one hand and acting as a load-sharing block on the other, which has the same function as a load-sharing block, uniformly distributing the axial thrust to each thrust pad 3, thereby effectively improving the load-sharing performance of all thrust pads 3 and reducing the phenomenon of uneven pad temperature.

[0029] In one feasible implementation, an oil inlet 8 is provided on the bearing body 2, and an oil passage 9 is provided inside the bearing body 2. One end of the oil passage 9 penetrates the inner wall of the bearing body 2, and the other end of the oil passage 9 is connected to the oil inlet 8 to facilitate the entry of lubricating oil. On the one hand, it lubricates the shaft passing through the thrust support combined bearing, and on the other hand, it forms an oil film on the surface of the thrust bearing 3 to reduce friction, thereby slowing down the rate of temperature rise of the thrust bearing 3 and reducing the bearing temperature.

[0030] This invention is not limited to the specific embodiments described above. This invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A thrust support combined bearing for a steam turbine, characterized by: The supporting bearing is provided with a plurality of thrust pads (3) on both sides, and an elastic grommet (4) is arranged between the supporting bearing and the thrust pads (3), and the direction from the surface where the thrust pads (3) are arranged to the surface where the elastic grommet (4) is arranged is along the axial direction of the supporting bearing.

2. The thrust support journal bearing of claim 1, wherein: The plurality of thrust pads (3) are arranged in a circumferential array with the axis of the supporting bearing as the center.

3. The thrust support journal bearing of claim 1, wherein: The supporting bearing comprises a pad body (2) and a pad sleeve (1), and the pad sleeve (1) is sleeved on the outer side surface of the pad body (2).

4. The thrust support journal bearing of claim 3, wherein: The pad body (2) and the pad sleeve (1) are matched by a spherical surface, and a pin key (7) is arranged between the pad body (2) and the pad sleeve (1), one end of the pin key (7) is located in the pad sleeve (1), and the other end of the pin key (7) is located in the pad body (2).

5. The thrust support journal bearing of claim 3, wherein: The thrust pad (3) is installed on the elastic grommet (4) through a first pin (5) and a second pin (6), the axes of the first pin (5) and the second pin (6) are along the axial direction of the pad body (2), and the elastic grommet (4) is elastically fitted in the pad body (2) by being abutted with the pad body (2) in a radial over-matching manner.

6. The thrust support journal bearing of claim 3, wherein: An oil inlet (8) is arranged on the pad body (2), and an oil channel (9) is arranged in the pad body (2), one end of the oil channel (9) penetrates the inner wall of the pad body (2), and the other end of the oil channel (9) is connected with the oil inlet (8).

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