CN113700732B - Gas turbine rotor supporting system based on sliding bearing and thrust disc - Google Patents

Abstract

The invention discloses a gas turbine rotor supporting system based on a sliding bearing and a thrust disc, which comprises a shaft, the thrust disc arranged at one end of the shaft and three sliding bearings, wherein the three sliding bearings comprise a radial sliding bearing, a radial thrust sliding bearing and a thrust sliding bearing, the radial thrust sliding bearing and the thrust sliding bearing are arranged at one end of the shaft, the radial thrust sliding bearing and the thrust sliding bearing are connected through bearing support legs, and the radial sliding bearing is arranged at the other end of the shaft and is connected with the bearing support legs through a bearing frame. The gas turbine rotor supporting system based on the sliding bearing and the thrust disc provided by the invention is based on the sliding bearing and the thrust disc, and all fulcrum positions are all provided with the sliding bearing, so that the advantages of the sliding bearing are fully exerted, and the gas turbine rotor supporting system based on the sliding bearing and the thrust disc has the advantages of strong bearing capacity, high radial positioning precision, good shock resistance, good rotation stability and small friction power consumption.

Description

A Gas Turbine Rotor Support System Based on Sliding Bearings and Thrust Disks

technical field

The invention relates to the technical field of gas turbines, in particular to a gas turbine rotor support system based on sliding bearings and thrust discs.

Background technique

A gas turbine is a device that converts the thermal energy of a high-temperature, high-pressure combustion gas into mechanical energy. The power turbine is an important part of the power output of the gas turbine. Due to the gradual expansion of the gas in the turbine, the power turbine bears a huge axial force. As the power turbine is a large-scale working component, the working environment of its large-scale rotor system has heavy loads, large impacts, and large vibrations, which may easily cause damage to the supporting components and affect the reliable operation of the components.

In the prior art, in the supporting layout of rotating machines, rolling bearings are usually used as the basis for supporting them. However, rolling bearings cannot adapt to environments with heavy loads, large shocks, and long working life, which affects the stability of the rotor system or leads to frequent maintenance and replacement. It not only reduces the operation safety of components, but also increases the operation and maintenance cost.

Therefore, it is necessary to provide a support system adapted to the gas turbine rotor to solve the above problems.

Contents of the invention

In order to solve the above problems, the present invention provides a gas turbine rotor support system based on sliding bearings and thrust discs. The support system includes a shaft, a thrust disc arranged at one end of the shaft, and three sliding bearings, wherein the three sliding bearings The bearings include radial sliding bearings, radial thrust sliding bearings and thrust sliding bearings, the radial thrust sliding bearings and thrust sliding bearings are arranged at one end of the shaft, the radial thrust sliding bearings and thrust The sliding bearings are connected through bearing legs, and the radial sliding bearing is arranged at the other end of the shaft and connected with the bearing legs through a load-bearing frame.

The gas turbine rotor support system based on sliding bearings and thrust disks provided by the present invention also has the feature that the radial thrust sliding bearings and thrust sliding bearings are respectively arranged on both sides of the thrust disk.

The gas turbine rotor support system based on sliding bearings and thrust discs provided by the present invention also has such a feature that the radial thrust sliding bearing includes radial support pads, radial thrust pads and radial thrust bearings In the casing, a radial thrust oil film is provided between the radial support pad and the shaft, and the radial thrust pad is close to the thrust plate.

The gas turbine rotor support system based on sliding bearings and thrust discs provided by the present invention also has such a feature that the thrust sliding bearing includes a thrust sliding bearing casing and a thrust pad, and the thrust pad is close to the Describe the thrust plate.

The gas turbine rotor support system based on sliding bearings and thrust disks provided by the present invention also has the feature that there is at least one bearing leg.

The gas turbine rotor support system based on sliding bearings and thrust discs provided by the present invention also has such a feature that when there are two or more bearing legs, the starting angle between the multiple bearing legs is 45°. Circumferentially evenly distributed with an interval angle of 90°.

The gas turbine rotor support system based on sliding bearings and thrust discs provided by the present invention also has such a feature that the end of the bearing leg is provided with the radial thrust sliding bearing and the thrust sliding bearing A connecting flange, the flange is connected with the radial thrust sliding bearing and the thrust sliding bearing through bolts.

The gas turbine rotor support system based on sliding bearings and thrust discs provided by the present invention also has such a feature that the radial sliding bearing includes a radial sliding support pad and a radial sliding bearing casing, and the radial sliding support The contact surface between the pad and the shaft is provided with a radial sliding oil film.

The gas turbine rotor support system based on sliding bearings and thrust disks provided by the present invention also has the feature that the radial sliding bearing case has a squirrel-cage elastic support.

Beneficial effect

The gas turbine rotor support system based on sliding bearings and thrust disks provided by the present invention is based on sliding bearings and thrust disks, and all fulcrum positions use sliding bearings, which fully utilizes the advantages of sliding bearings, and has strong bearing capacity, high radial positioning accuracy, It has the advantages of good impact resistance, good rotation stability and low friction power consumption.

The radial sliding bearing used in the present invention has a small radial thickness and has the advantages of compact structure and space saving; at the same time, the bearing casing included in it has the structural characteristics of a squirrel-cage elastic support and has the advantage of suppressing vibration.

The radial thrust sliding bearing and the thrust sliding bearing used in the present invention are located on one side of the load-bearing frame, and are connected into one body through the bearing legs, and then clamp the thrust plate from both sides, with a compact layout. , The advantage of the design that facilitates the centralized sharing of oil and gas lines.

The bearing support leg provided by the invention connects two bearings (thrust sliding bearings and radial thrust sliding bearings) on the load-bearing frame, and has the advantages of compact layout, solid structure and easy installation.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only an implementation means of the present invention, and It does not represent the real appearance of the object. For those skilled in the art, other drawings can be obtained by transformation according to the needs of the actual situation on the premise of not paying creative work.

Fig. 1 is the structural representation of the gas turbine rotor support system based on sliding bearings and thrust discs provided by the present invention;

Fig. 2 is a schematic diagram of the circumferential distribution of bearing legs in the gas turbine rotor support system based on sliding bearings and thrust disks provided by the present invention.

Among them: 1: shaft; 2: thrust plate; 3: radial thrust sliding bearing; 3.1: radial thrust pad; 3.2: radial support pad; 3.3: radial thrust sliding bearing casing; 4: Bearing leg; 5: Thrust sliding bearing; 5.1: Thrust sliding bearing casing; 5.2: Thrust pad; 6: Bearing frame; 7: Radial sliding bearing; 7.1: Radial sliding support pad; 7.2 : radial sliding bearing casing; A: first radial support position; B: second radial support position; C: first axial support position; D: second axial support position.

Detailed ways

In order to make the technical means, creative features, goals and effects of the present invention easy to understand, the following embodiments will specifically illustrate the gas turbine rotor support system based on sliding bearings and thrust discs provided by the present invention in conjunction with the accompanying drawings.

In the description of the embodiments of the present invention, it should be understood that the terms "center", "spanwise", "chordwise", "upper", "lower", "left", "right", "left end" , "right end", "vertical", "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships described in the drawings, and are only In order to facilitate the description of the invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only, and should not be interpreted as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

The terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct It can also be connected indirectly through an intermediary, or it can be the internal communication of two elements. In addition, terms such as "distribution", "arrangement", "fixation", and "setting" should be understood conceptually, and do not involve any special combination or processing technology, but only emphasize a state of structure. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.

As shown in Figures 1-2, the gas turbine rotor support system based on sliding bearings and thrust disks provided by the present invention. The support system includes a shaft 1, a thrust plate 2 arranged at one end of the shaft 1, and three sliding bearings, wherein the three sliding bearings include a radial sliding bearing 7, a radial thrust sliding bearing 3 and a thrust sliding bearing 5. The radial thrust sliding bearing 3 and the thrust sliding bearing 5 are arranged at one end of the shaft 1, and the radial thrust sliding bearing 3 and the thrust sliding bearing 5 are connected through a bearing leg 4, so The radial sliding bearing 7 is arranged on the other end of the shaft 1 and is connected with the bearing leg 4 through the bearing frame 6 .

In the above embodiment, the bearing leg 4 connects two bearings (thrust sliding bearing 5 and radial thrust sliding bearing 3) on the load-bearing frame 6, which has the advantages of reasonable and compact layout, strong bearing capacity, and high radial positioning accuracy , Good impact resistance, good rotation stability, and low friction power consumption.

In some embodiments, the radial thrust sliding bearing 3 and the thrust sliding bearing 5 are respectively arranged on both sides of the thrust plate 2 . The radial thrust sliding bearing 3 and the thrust sliding bearing 5 clamp the thrust plate 2 from both sides, which has the advantages of compact layout and convenient concentration of oil and gas passages.

In some embodiments, the radial thrust sliding bearing 3 includes a radial support pad 3.2, a radial thrust pad 3.1 and a radial thrust bearing casing 3.3, and the radial support pad 3.2 and the A radial thrust oil film is provided between the shafts 1 , and the radial thrust pads 3.1 are close to the thrust disc 2 . In this embodiment, the radial thrust sliding bearing 3 has the functions of radial bearing and axial thrust at the same time, and the radial support pad 3.2 and the shaft 1 form the first radial support through the radial thrust oil film on the contact surface At position A, the contact surface between the radial thrust pad 3.1 and the thrust plate 2 forms the first axial support position C, which is the main thrust fulcrum that bears most of the axial thrust.

In some embodiments, the thrust sliding bearing 5 includes a thrust sliding bearing casing 5.1 and a thrust shoe 5.2, and the thrust shoe 5.2 is close to the thrust plate 2. The contact surface between the thrust pad 5.2 and the relay plate 2 forms a second axial support position D, and the second axial support position D is an auxiliary thrust fulcrum that bears a small amount of reverse thrust.

In some embodiments, the radial sliding bearing 7 includes a radial sliding support pad 7.1 and a radial sliding bearing housing 7.2, and the contact surface between the radial sliding support pad 7.1 and the shaft 1 is provided with a diameter towards the sliding oil film. The contact surface between the radially sliding support pad 7.1 and the shaft 1 forms the second radial support position B, and the radial thickness of the radially sliding support pad contained therein is relatively small, which has the advantage of compact structure and space saving. The radial sliding bearing casing has a squirrel-cage elastic support. The squirrel-cage elastic bearing plays a role in damping vibration.

As shown in FIG. 2 , in this embodiment, there are four bearing legs 4 . The four bearing legs 4 are uniformly distributed in the circumferential direction according to a starting angle of 45° and an interval angle of 90°. The end of the bearing leg 4 is provided with a flange for connecting with the radial thrust sliding bearing 3 and the thrust sliding bearing 5, and the flange is connected to the radial thrust sliding bearing 3 and the thrust sliding bearing 5 through bolts. The thrust sliding bearing 5 is connected. The flange is connected with the radial thrust sliding bearing casing 3.3 on the radial thrust sliding bearing 3 and the thrust sliding bearing casing 5.1 on the thrust sliding bearing 5 .

To sum up, the gas turbine rotor support system based on sliding bearings and thrust discs provided by the present invention has two radial supports and two axial support points, the support effect is better, and the layout is reasonable and compact, the bearing capacity is strong, the radial It has the characteristics of high orientation positioning accuracy, good impact resistance, good rotation stability and low friction power consumption.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range. The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made, these improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (7)

1. A gas turbine rotor support system based on sliding bearings and thrust discs, characterized in that the support system includes a shaft, a thrust disc arranged at one end of the shaft and three sliding bearings, wherein the three sliding bearings include radial A radial thrust sliding bearing, a radial thrust sliding bearing and a thrust sliding bearing, the radial thrust sliding bearing and the thrust sliding bearing are arranged at one end of the shaft, and the radial thrust sliding bearing and the thrust sliding bearing The space is connected by a bearing leg, and the radial sliding bearing is arranged at the other end of the shaft, and is connected with the bearing leg through a load-bearing frame, The radial sliding bearing includes a radial sliding support pad and a radial sliding bearing casing, and a radial sliding oil film is provided on the contact surface between the radial sliding support pad and the shaft, The radial sliding bearing casing has a squirrel-cage elastic support. 2 . The gas turbine rotor support system based on sliding bearings and thrust disks according to claim 1 , wherein the radial thrust sliding bearings and thrust sliding bearings are respectively arranged on both sides of the thrust disk. 3. The gas turbine rotor support system based on sliding bearings and thrust discs according to claim 1, wherein the radial thrust sliding bearing comprises a radial support shoe, a radial thrust shoe and a radial stop In the case of a thrust bearing, a radial thrust oil film is provided between the radial support pad and the shaft, and the radial thrust pad is close to the thrust plate. 4. The gas turbine rotor support system based on a sliding bearing and a thrust disc according to claim 1, wherein the thrust sliding bearing comprises a thrust sliding bearing casing and a thrust pad, and the thrust pad close to the thrust plate. 5. The gas turbine rotor support system based on sliding bearings and thrust disks according to claim 1, wherein there is at least one bearing leg. 6. The gas turbine rotor support system based on sliding bearings and thrust discs according to claim 5, wherein when there are two or more bearing legs, the plurality of bearing legs are arranged according to the starting angle 45° and an interval angle of 90° for circumferential uniform distribution. 7. The gas turbine rotor support system based on sliding bearings and thrust discs according to claim 6, characterized in that, the end of the bearing leg is provided for contact with the radial thrust sliding bearing and the thrust A flange connected to the sliding bearing, the flange is connected to the radial thrust sliding bearing and the thrust sliding bearing through bolts.