CN207421120U - A Large Thrust Support Combined Bearing for Steam Turbine - Google Patents

Abstract

The utility model discloses a large-scale thrust support joint bearing for steam turbine belongs to steam turbine technical field. Large thrust support combined bearing for a steam turbine, comprising: four supporting pads, eight pairs of thrust pads and bearing bodies; the four supporting pads are uniformly arranged on the inner hole of the bearing body at equal intervals, pin holes are formed in the back of each supporting pad, pin holes which are concave to the center of the bearing body are formed in the corresponding inner hole of the bearing body, and the pin holes of the supporting pads are connected with the pin holes which are concave to the center of the bearing body in the inner hole of the bearing body through supporting pins; each pair of the thrust pads are symmetrically arranged at two ends of the bearing body, eight thrust pads are uniformly and annularly arranged in an outer hole at each end of the bearing body, and the thrust pads are fan-shaped. The utility model discloses can bear the great load of low pressure rotor, guarantee that bearing bush temperature, oil temperature and consumption etc. all in the designing requirement within range, satisfied bearing box inner space structural requirement again, and have good stability characteristic.

Description

A Large Thrust Support Combined Bearing for Steam Turbine

technical field

The utility model belongs to the technical field of steam turbines, in particular to a large-scale thrust support combined bearing for steam turbines.

Background technique

With the development of steam turbine technology, the unit load and stability requirements are getting higher and higher, and the requirements for bearing dimensions are also becoming more and more stringent. For the new type of steam turbine generator set with shortened unit length (that is, the steam turbine shaft system adopts N+1 support structure), the existing bearings cannot meet the requirements of shortening the unit length under the conditions of high speed and heavy load, and realizing long-term reliable and stable operation of the unit. running effect.

Contents of the invention

The purpose of this utility model is to solve the above-mentioned problems, and now provides a large-scale thrust support combined bearing for a steam turbine that can work under high-speed and heavy-load conditions.

A large-scale thrust support combined bearing for a steam turbine, comprising: four support pads, eight pairs of thrust pads and a bearing body;

The four supporting tiles are equidistantly installed on the inner hole of the bearing, the back of the supporting tile is provided with a pin hole, and the corresponding inner hole of the bearing is provided with a pin hole concave to the center of the bearing body , the pin hole of the support tile is connected with the pin hole in the inner hole of the bearing body concave to the center of the bearing body through the support pin;

Each pair of thrust pads is arranged symmetrically at both ends of the bearing body, and eight thrust pads are arranged in a uniform ring in the outer hole at each end of the bearing body, and the thrust pads are fan-shaped.

Preferably, spacers are provided inside the pin holes of the supporting pads.

Preferably, it also includes: a bridge block holding ring, the bridge block holding ring is arranged in the outer hole at each end of the bearing body, the annular groove of the bridge block holding ring faces the outer end, and the thrust pad is closed the annular groove.

Preferably, it further includes: an adjusting gasket, the adjusting gasket is arranged between the bottom surface of the bridge block holding ring and the bottom surface of the outer hole of the bearing.

Preferably, it further includes: a balance bridge block, the balance bridge block is located in the annular groove of the bridge block holding ring.

Preferably, the pad surface of the thrust pad is provided with a pad alloy layer.

Preferably, the support block on the back of the pad supporting the pad is a point support, which can automatically tilt to form an oil wedge during operation, so that a dynamic pressure oil film is formed between the surface of the support pad and the thrust plate, and the shaft is driven by the balance bridge block. The axial thrust is evenly distributed to each of said thrust pads.

Preferably, the thrust pad adopts forced lubrication, and the lubricating oil directly acts on the middle of the thrust pad and the thrust plate through the nozzle.

Preferably, it also includes: a steel block and a spacer, and the large-scale thrust support joint bearing for the steam turbine is supported in the bearing box bracket through the steel block and the spacer.

The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the utility model can be achieved.

The beneficial effect of the utility model is that the large-scale thrust support combined bearing of the steam turbine not only solves the axial load requirement of the unit, but also supports a larger load of the low-pressure rotor, and ensures that the temperature of the bearing pad, oil temperature and power consumption are all within the scope of the design requirements , and meet the internal space structure requirements of the bearing box, and have good stability characteristics.

Description of drawings

Fig. 1 is the bearing longitudinal section schematic diagram of the steam turbine described in the utility model with large-scale thrust supporting combined bearing;

Fig. 2 is a schematic cross-sectional view of a thrust pad of a large-scale thrust support combined bearing for a steam turbine described in the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

As shown in Figures 1-2, a large-scale thrust support combined bearing for a steam turbine includes: four support pads 11, eight pairs of thrust pads 6 and a bearing body 5;

The four supporting tiles 11 are equidistantly installed on the inner hole of the bearing body 5, the back of the supporting tile 11 is provided with a pin hole, and the inner hole of the corresponding bearing body 5 is provided with a pin hole concave to the center of the bearing body 5, The pin hole supporting the pad 11 is connected with the pin hole in the inner hole of the bearing body 5 concaved toward the center of the bearing body 5 through the supporting pin 10;

Each pair of thrust pads 6 is symmetrically arranged at both ends of the bearing body 5, and eight thrust pads 6 are arranged uniformly in the outer hole of each end of the bearing body 5, and the thrust pads 6 are fan-shaped.

Further, a spacer 1 is provided inside the pin hole of the supporting tile 11 .

In this embodiment, the supporting bearing part is the supporting pad 11, which ensures that the bearing is automatically adjusted according to the deflection and deformation of the rotor, so that there is better contact between the thrust surface of the pad and the surface of the rotor thrust disk. The large-scale thrust support combined bearing used for steam turbine not only solves the axial load requirement of the unit, but also supports the large load of the low-pressure rotor, ensures that the bearing pad temperature, oil temperature and power consumption are all within the design requirements, and satisfies the inner space of the bearing box. Structural requirements, and has good stability characteristics.

In a preferred embodiment, it also includes: bridge block holding ring 7, adjusting gasket 3 and balance bridge block 4;

The bridge block holding ring 7 is arranged in the outer hole of each end of the bearing body 5, the annular groove of the bridge block holding ring 7 faces the outer end, and the thrust pad 6 closes the annular notch; the adjusting gasket 3 is arranged on the bridge block holding ring Between the bottom surface of 7 and the bottom surface of the outer hole of the bearing body 5; the balance bridge block 4 is located in the annular groove of the bridge block holding ring 7.

Further, the pad surface of the thrust pad 6 is provided with a pad alloy layer 2 to increase the allowable temperature of the bearing. The allowable temperature of the bearing can be increased from 113°C to 130°C, which increases the allowable temperature of the bearing, expands the working conditions of the bearing, and reduces the occurrence of downtime caused by the high temperature of the unit's running tile.

In a preferred embodiment, the support block on the back of the pad that supports the pad 11 is a point support, which can automatically tilt to form an oil wedge during operation, so that a dynamic pressure oil film is formed between the surface of the support pad 11 and the thrust plate, and through the balance bridge block 4. Make the axial thrust evenly distributed on each thrust pad 6. The thrust pad 6 adopts forced lubrication, and the lubricating oil directly acts on the middle of the thrust pad 6 and the thrust plate through the nozzle 12, which can effectively ensure the thrust bearing is fully lubricated, and ensure the uniform cooling of each bearing pad to support the axial thrust of the rotor and improve Turbine unit operation stability.

In a preferred embodiment, it also includes: a steel spacer 8 and a spacer, and the large-scale thrust support combined bearing for the steam turbine is supported in the bearing box bracket through the steel spacer 8 and the spacer 9 .

In this embodiment, the outer surface of the steel pad 8 is machined to a diameter slightly smaller than the inner hole of the bearing seat. Between the pads and the bearings, use spacers to adjust the support bearings vertically and horizontally, and then use the spacers to adjust the thrust bearings axially, so that the rotor can be precisely positioned in the cylinder. A stop pin that is assembled in the bearing body 5 slightly lower than the level mid-section stretches in a groove of the bearing housing support, which can prevent the rotation of the bearing.

The large-scale thrust support combined bearing for steam turbines adopts double-sided tilting pads and forced lubrication structure, which not only solves the axial load requirements of the unit, but also supports the large load of the low-pressure rotor, ensuring that the bearing pad temperature, oil temperature and power consumption are all within the design Within the required range, it also meets the internal space structure requirements of the bearing box, and has good stability characteristics.

Although the invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It is therefore to be understood that numerous modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the invention as defined by the appended claims. It shall be understood that different dependent claims and features described herein may be combined in a different way than that described in the original claims. It will also be appreciated that features described in connection with individual embodiments can be used in other described embodiments.

Claims (9)

1. a kind of steam turbine supports joint bearing with large-scale thrust, which is characterized in that including：Four are supported tile fragment, eight pairs of thrusts Tile fragment and bearing body；

Described four are supported tile fragment is equidistant to be uniformly mounted on the bearing body endoporus, and watt back of the body for supporting tile fragment is provided with Pin hole, the corresponding bearing body endoporus is interior to be equipped with the pin hole for concaving towards bearing body center, and the pin hole for supporting tile fragment leads to It crosses anchor and is connected with concaving towards the pin hole at bearing body center in the bearing body endoporus；

Thrust pad described in each pair is symmetrically disposed on the both ends of the bearing body, uniform ring in exit orifice of the bearing body per one end Equipped with eight thrust pads, the thrust pad is in sector.

2. steam turbine according to claim 1 supports joint bearing with large-scale thrust, which is characterized in that the support tile fragment Pin hole on the inside of be provided with cushion block.

3. steam turbine according to claim 1 supports joint bearing with large-scale thrust, which is characterized in that further includes：Bridge block Held in ring, the bridge block held in ring are arranged in exit orifice of the bearing body per one end, and the annular groove of the bridge block held in ring faces out End, the thrust pad close the annular groove.

4. steam turbine according to claim 3 supports joint bearing with large-scale thrust, which is characterized in that further includes：Adjustment Gasket, the adjust pad are arranged between the bridge block held in ring bottom surface and the bearing body exit orifice bottom surface.

5. steam turbine according to claim 3 supports joint bearing with large-scale thrust, which is characterized in that further includes：Balance Bridge block, the balance bridge block are located in the annular groove of the bridge block held in ring.

6. the steam turbine according to claim 1,3 or 5 supports joint bearing with large-scale thrust, which is characterized in that described to push away The tiling of power tile fragment is provided with tile fragment alloy-layer.

7. steam turbine according to claim 5 supports joint bearing with large-scale thrust, which is characterized in that the support tile fragment Watt back support block supported for point, during operating can wing drop form oil film wedge, make shape between support tile fragment surface and thrust disc Into dynamic pressure oil film, and by the balance bridge block axial thrust is made to be uniformly distributed in each thrust pad.

8. steam turbine according to claim 6 supports joint bearing with large-scale thrust, which is characterized in that the thrust pad Using forced feed lubrication, lubricating oil is directly acted on by nozzle among the thrust pad and thrust disc.

9. steam turbine according to claim 1 supports joint bearing with large-scale thrust, which is characterized in that further includes：Steel Cushion block and gasket, the steam turbine support joint bearing by the steel cushion block and gasket, to be supported on bearing with large-scale thrust In box bracket.