CN210829412U

CN210829412U - Radial steam turbine main shaft end bearing structure

Info

Publication number: CN210829412U
Application number: CN201921831392.0U
Authority: CN
Inventors: 宋国亮
Original assignee: Anhui Xinning Energy Science & Technology Co ltd
Current assignee: Anhui Xinning Energy Science & Technology Co ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-06-23
Anticipated expiration: 2029-10-29

Abstract

The utility model discloses a radial steam turbine main shaft tip bearing structure, include the steam turbine main shaft and establish thrust dish and the thrust bearing at steam turbine main shaft tip, thrust bearing includes interior thrust bearing and outer thrust bearing, thrust dish is located between thrust bearing and the outer thrust bearing, interior thrust bearing is sliding thrust bearing or rolling thrust bearing, and the outer thrust bearing that is located the thrust dish outside is rolling thrust bearing. This radial steam turbine main shaft tip bearing structure reasonable in design, the bearing that is located the thrust dish outside changes rolling thrust bearing into, carries out oil lubrication, only needs very little start-up moment so, and the main shaft just can rotate, does not have wearing and tearing almost to bearing thrust surface, and it starts steadily, and the noise is little.

Description

Radial steam turbine main shaft end bearing structure

Technical Field

The utility model belongs to the technical field of the steam turbine technique and specifically relates to a radial steam turbine main shaft end bearing structure is related to.

Background

The radial steam turbine is widely used for a steam residual pressure turbine expansion generator set at present, is energy-saving and emission-reduction equipment integrating the functions of temperature reduction, pressure reduction and power generation, and is characterized in that a skid-mounted turbine expansion generator set is connected in parallel to an original temperature reduction-pressure reduction mounting system. The radial steam turbine mainly comprises a steam inlet chamber, a fixed nozzle group, an impeller, a high-speed spindle, an exhaust chamber and the like, and steam is discharged from an axial spray pipe after passing through a centripetal turbine.

The axial thrust directions of the radial steam turbine before and after starting are opposite; sliding thrust bearings are adopted on two sides of a thrust disc at the end part of a main shaft of an existing steam turbine, outward thrust exists before starting, the thrust disc is pressed on the end face of the sliding thrust bearing on the outer side, and an oil wedge is not established on the sliding thrust bearing at the moment, so that the shaft can be rotated only by a large starting torque, the abrasion to the thrust surface of the bearing is serious, and the stability of a radial steam turbine is influenced.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model aims to solve the technical problem that a radial steam turbine main shaft end bearing structure is provided to reach the little purpose of start-up moment.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:

this radial steam turbine main shaft tip bearing arrangement includes the steam turbine main shaft and establishes thrust dish and the thrust bearing at steam turbine main shaft tip, thrust bearing includes interior thrust bearing and outer thrust bearing, the thrust dish is located between thrust bearing and the outer thrust bearing, interior thrust bearing is sliding thrust bearing or rolling thrust bearing, and the outer thrust bearing that is located the thrust dish outside is rolling thrust bearing.

Further, the inner thrust bearing on the inner side of the thrust disc is a sliding thrust bearing.

And the distance between the outer end surface of the inner thrust bearing and the inner end surface of the outer thrust bearing is greater than the thickness of the thrust disc.

And the rolling thrust bearing on the outer side of the thrust disc is a thrust ball bearing.

The distance between the outer end face of the inner thrust bearing and the inner end face of the outer thrust bearing is 0.05-0.09mm larger than the thickness of the thrust disc.

Compared with the prior art, the utility model, have following advantage:

this radial steam turbine main shaft tip bearing structure reasonable in design, the bearing that is located the thrust dish outside changes rolling thrust bearing into, carries out oil lubrication, only needs very little start-up moment so, and the main shaft just can rotate, does not have wearing and tearing almost to bearing thrust surface, and it starts steadily, and the noise is little.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

fig. 1 is a schematic view of the operation of the utility model before starting.

Fig. 2 is the working schematic diagram of the utility model after starting.

In the figure:

1. the main shaft of the steam turbine, 2, a sliding thrust bearing, 3, a thrust disk, 4, a rolling thrust bearing, 5, a thrust disk is attached to the rolling thrust bearing, and 6, the thrust disk is attached to the sliding thrust bearing.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, the radial turbine main shaft end bearing structure is suitable for the characteristics that the thrust on the radial turbine main shaft is large and the directions of the axial thrust before and after starting are opposite, and the working form of the combination of the thrust ball bearing and the sliding thrust bearing enables the turbine to work more stably.

The radial bearing structure for the end part of the main shaft of the steam turbine comprises a main shaft 1 of the steam turbine, a thrust disc 3 and a thrust bearing, wherein the thrust disc 3 and the thrust bearing are arranged at the end part of the main shaft of the steam turbine, the thrust bearing comprises an inner thrust bearing and an outer thrust bearing, the thrust disc is positioned between the inner thrust bearing and the outer thrust bearing, the inner thrust bearing is a sliding thrust bearing or a rolling thrust bearing, and the outer thrust bearing positioned on the outer side of the thrust disc is a rolling thrust bearing.

Preferably, the inner thrust bearing inside the thrust disk is a sliding thrust bearing 2; the rolling thrust bearing 4 on the outer side of the thrust disc is a thrust ball bearing, and the steam turbine works stably and reliably.

The distance between the outer end face of the inner thrust bearing and the inner end face of the outer thrust bearing is greater than the thickness of the thrust disk. Preferably, the distance between the outer end face of the inner thrust bearing and the inner end face of the outer thrust bearing is 0.05-0.09mm greater than the thickness of the thrust disk.

As shown in fig. 1, before start-up:

because the main shaft is subjected to a larger axial thrust force towards the right, the thrust disc is tightly pressed on the bearing end surface on the right, and if a traditional sliding bearing is adopted, an oil wedge is not established at the moment, so that the shaft can be rotated only by a large starting torque, and the abrasion to the bearing thrust surface is particularly serious; the utility model discloses in change to use thrust ball bearing, carry out oil lubrication, thrust dish and rolling thrust bearing laminating 5, so only need very little start-up moment, the main shaft just can rotate, does not have wearing and tearing almost to bearing thrust surface, and starts steadily, and the noise is little.

As shown in fig. 2, after start-up:

after the spindle is started to a certain rotating speed, the axial force borne by the spindle is changed to the left, the spindle is separated from the end face of the thrust ball bearing, the thrust ball bearing stops working, and the thrust disc is attached to the sliding thrust bearing after the spindle is started 6; at the moment, because the rotating speed of the shaft reaches a certain value, an effective lubricating oil wedge is established on the thrust surface of the left sliding thrust bearing, so that the smooth rotation of the main shaft is ensured.

The design mainly deals with the condition that the main shaft is subjected to axial force turning before and after the radial steam turbine is started, the ball bearing can work well at low speed, and the sliding bearing works completely at high speed, so that the stability of starting and running of the rotating shaft is ensured, and the service life of the bearing can be ensured.

The above-mentioned features are merely for describing preferred embodiments of the present invention and may be arbitrarily combined to form a plurality of embodiments of the present invention.

The present invention has been described in detail with reference to the accompanying drawings, and it is apparent that the present invention is not limited by the above embodiments, and various insubstantial improvements can be made without modification to the present invention.

Claims

1. The utility model provides a radial type steam turbine main shaft tip bearing arrangement, includes the steam turbine main shaft and establishes thrust dish and thrust bearing at steam turbine main shaft tip, its characterized in that: the thrust bearing comprises an inner thrust bearing and an outer thrust bearing, the thrust disc is positioned between the inner thrust bearing and the outer thrust bearing, the inner thrust bearing is a sliding thrust bearing or a rolling thrust bearing, and the outer thrust bearing positioned on the outer side of the thrust disc is a rolling thrust bearing.

2. The radial turbine main shaft end bearing structure according to claim 1, wherein: the inner thrust bearing on the inner side of the thrust disc is a sliding thrust bearing.

3. The radial turbine main shaft end bearing structure according to claim 1, wherein: and the distance between the outer end surface of the inner thrust bearing and the inner end surface of the outer thrust bearing is greater than the thickness of the thrust disc.

4. The radial turbine main shaft end bearing structure according to claim 1, wherein: and the rolling thrust bearing on the outer side of the thrust disc is a thrust ball bearing.

5. The radial turbine main shaft end bearing structure according to claim 3, wherein: the distance between the outer end face of the inner thrust bearing and the inner end face of the outer thrust bearing is 0.05-0.09mm larger than the thickness of the thrust disc.