CN115789079A - Thrust support combined bearing for high-speed unit - Google Patents

Abstract

A thrust support combined bearing for a high-speed unit relates to a thrust support combined bearing. The invention aims to solve the problem that the safe and stable operation of the existing high-speed unit cannot be better ensured due to the phenomenon of bearing instability easily occurring in the operation process of the existing high-speed unit. A plurality of supporting pads are annularly arranged and connected with a first oil retainer ring and a second oil retainer ring, the supporting pads are annularly sleeved on the plurality of supporting pads, and supporting points of the supporting pads are respectively positioned on the upper half-distance middle split surface and the lower half-distance middle split surface of a shaft pad body by 45 degrees; the supporting component is arranged in the bearing box bracket through an auxiliary component; the third oil retainer ring and the oil seal are arranged on the left side of the bearing bush body, the first mounting ring and the second mounting ring are respectively arranged in the bearing bush body, and the positive thrust pad and the negative thrust pad are hung on the first mounting ring and the second mounting ring. The invention is used in high-speed steam turbines.

Description

A combination bearing for thrust support of high speed unit

technical field

The invention relates to a supporting combined bearing, in particular to a thrust supporting combined bearing for a high-speed unit.

Background technique

With the development of steam turbine technology and changes in the market environment, high-speed steam turbines (generally above 5500r/min) have gradually become the development trend of small units. More and more strict, in order to meet the high speed conditions of the new turbogenerator set, to achieve long-term reliable and stable operation of the unit, it is necessary to design a small thrust support combined bearing that can meet the new operating requirements.

The steam turbine in the current new turbogenerator set adopts high speed, and after being decelerated by the gear box, it drives the generator to generate electricity. The high-speed steam turbine rotor has light load and high flexibility, and the phenomenon of bearing instability is prone to occur during operation, which leads to the problem that the safe and stable operation of the unit cannot be better guaranteed.

To sum up, the existing high-speed unit is prone to bearing instability during operation, which leads to the problem that the safe and stable operation of the unit cannot be better guaranteed.

Contents of the invention

The purpose of the present invention is to solve the problem that the existing high-speed unit is prone to bearing instability during operation, which leads to the problem that the safe and stable operation of the unit cannot be better ensured. Furthermore, a thrust support joint bearing for a high-rotational unit is provided.

The technical solution of the present invention is: a thrust support combined bearing for a high-speed unit includes an auxiliary component, a support component and a thrust component, wherein the support component is a four-tile tiltable pad structure, and the thrust component is a swing line pad structure; The support component includes a first oil deflector ring, a second oil deflector ring, a plurality of supporting pads, a bearing pad body and a plurality of supporting pins, the multiple supporting pads are arranged in a ring, and the ends on both sides of the multiple supporting pads pass through multiple Two support pins are respectively connected with the first oil deflector ring and the second oil deflector ring, the bearing pad body is annularly sleeved on multiple support pads, and the support points of the support pads are respectively located at 45° from the upper and lower half of the bearing pad body to the middle split plane position; the supporting parts are installed in the bearing box bracket through auxiliary parts; the thrust parts include the first installation ring, positive thrust tile, negative thrust tile, second installation ring, third oil deflector ring and oil seal, third oil deflector ring and The oil seal is installed on the left side of the bearing body from left to right. The first installation ring and the second installation ring are respectively installed in the bearing body. On the mounting ring, the positive thrust tile and the negative thrust tile are installed with oil seals.

Further, the first oil deflector ring and the second oil deflector ring are fixedly installed on the bearing pad body through a plurality of bolts.

Further, the backs of the positive thrust pad and the negative thrust pad are both supported by wires, 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 pad and the thrust plate.

Further, oil injection holes are provided between the positive thrust pads and the negative thrust pad chamber.

Further, the auxiliary parts include steel pads, gasket assemblies, side gaskets, bearing bushes and stop pins, the bearing bushes are set on the bearing bush body, the upper half center of the bearing bush body is provided with a stop pin, steel pads, pads The disc assembly and side spacers are mounted on the bushings and integrally mounted on the stepped shoulder of the bearing housing bracket.

Further, the bearing pad sleeve and the bearing pad body are in spherical contact.

Further, the steel spacer and the spacer assembly include a spacer and a transverse spacer, the transverse spacer is installed in the lower groove of the stepped groove and contacts the outer surface of the bearing bush, and the spacer is installed on the transverse spacer.

Further, it also includes a support component, the support component includes a support pin, a spring, a screw plug and a housing, the housing is installed on the bearing sleeve, the support pin and the spring are inserted into the housing, and one end of the support pin protrudes from the housing The bearing body is supported, and the screw plug encapsulates the support pin and the spring in the casing, and the spring force of the spring can be adjusted by adjusting the screw-in depth of the screw plug.

Compared with the prior art, the present invention has the following effects:

In the thrust support combined bearing of the present invention, the supporting part adopts a four-pad tiltable pad structure, which has strong adaptability to the rotor shaft system, and there will be no problem of bearing instability during operation, which meets the axial load requirements of the unit and ensures the temperature of the bearing pads. , unit vibration, etc. are within the scope of the design requirements, and also meet the internal space structure requirements of the bearing box, and have good stability characteristics.

Description of drawings

Fig. 1 is a longitudinal sectional view of a bearing of the present invention;

Fig. 2 is a sectional view of a thrust component;

Fig. 3 is a sectional view of a support member.

Detailed ways

Specific Embodiment 1: This embodiment is described with reference to Figures 1 to 3. A thrust support combined bearing for a high-speed unit in this embodiment includes an auxiliary component, a support component and a thrust component, wherein the support component is a four-tile block that can be tilted Pad structure, the thrust part is a swing line type pad structure; the supporting part includes a first oil deflector ring 11, a second oil deflector ring 12, a plurality of supporting pads 10, a bearing body 9 and a plurality of supporting pins 13, and a plurality of supporting The pads 10 are arranged in a ring, and the ends on both sides of a plurality of support pads 10 are respectively connected with the first oil deflector ring 11 and the second oil deflector ring 12 through a plurality of support pins 13, and the bearing pad body 9 is annularly sleeved on the plurality of support pins 13. on the pad 10, and the supporting points of the pad 10 are respectively located at the position of 45° from the upper and lower half of the bearing pad body 9 to the middle split plane; the supporting parts are installed in the bearing box bracket A through auxiliary parts; the thrust parts include the first installation ring 1. Positive thrust pad 2, negative thrust pad 3, second installation ring 4, third oil deflector ring 5 and oil seal 20; the third oil deflector ring 5 and oil seal 20 are installed on the left side of the bearing pad body 9 in sequence from left to right , the first mounting ring 1 and the second mounting ring 4 are installed in the bearing body 9 respectively, the positive thrust pad 2 and the negative thrust pad 3 are respectively hung on the first mounting ring 1 and the second mounting ring 4 through a plurality of pins, positive Thrust tile 2 and negative thrust tile 3 are equipped with oil seal 20.

The supporting tiles 10 in this embodiment adopt point supports to ensure that the tiles are automatically adjusted as the rotor deflection changes during the operation of the unit.

Embodiment 2: This embodiment is described with reference to FIG. 1 . The first oil deflector ring 11 and the second oil deflector ring 12 of this embodiment are fixedly installed on the bearing body 9 by a plurality of bolts. It is set in this way to prevent the position of the support tile 10 from changing during operation. Other compositions and connections are the same as in the first embodiment.

Specific embodiment three: This embodiment is described in conjunction with Fig. 1. The backs of the positive thrust pad 2 and the negative thrust pad 3 of this embodiment are all line supports, and can automatically tilt to form an oil wedge during operation, so that the surface of the pad and the thrust plate A dynamic oil film is formed between them. Such a setting can increase the bearing capacity of the pad, increase the oil intake, and reduce the tile temperature. Other compositions and connections are the same as those in Embodiment 1 or Embodiment 2.

Specific Embodiment 4: This embodiment is described with reference to FIG. 1 . In this embodiment, oil injection holes are provided between the positive thrust pads 2 and the negative thrust pads 3 chambers. Such setting can effectively ensure that the thrust bearing is sufficiently lubricated to support the axial thrust of the rotor. Other compositions and connections are the same as those in Embodiment 1, 2 or 3.

Embodiment 5: This embodiment is described in conjunction with FIG. 1. The auxiliary parts of this embodiment include steel pads, gasket assemblies 14, side gaskets 7, bearing sleeves 8 and stop pins 6, and the bearing sleeves 8 are set on the bearing body. 9, a stop pin 6 is provided at the center of the upper half of the bearing body 9, and the steel spacer, the spacer assembly 14 and the side spacer 7 are installed on the bearing bush 8, and are integrally installed on the stepped shoulder of the bearing box bracket A . Such setting facilitates smooth and high-precision cooperating installation with the bearing box bracket A. Other compositions and connections are the same as in Embodiment 4.

Embodiment 6: This embodiment is described with reference to FIG. 1 . In this embodiment, the bearing bush sleeve 8 and the bearing body 9 are in spherical contact. This setting ensures that the bearings are 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. Other compositions and connections are the same as those in Embodiment 5.

Specific Embodiment Seven: This embodiment is described in conjunction with FIG. 1. The steel pad and gasket assembly 14 of this embodiment include a pad 14-1 and a horizontal gasket 14-2. The horizontal gasket 14-2 is installed in the stepped concave In the lower groove of the groove and in contact with the outer surface of the bearing bush 8, the cushion block 14-1 is installed on the transverse gasket 14-2. In this way, the outer surface of the spacer is processed to a diameter slightly smaller than the inner hole of the bearing seat. Between each spacer and the bearing, spacers are used to adjust the vertical and horizontal positions of the bearings, and then spacers 7 are used to adjust the bearings. The axial position makes the rotor precisely positioned in the cylinder. Other compositions and connections are the same as those in Embodiment 1, 2, 3, 4, 5 or 6.

Embodiment 8: This embodiment is described in conjunction with FIG. 1. This embodiment also includes a support component. The support component includes a support pin 21, a spring 22, a screw plug 23 and a housing 24. The housing 24 is installed on the bearing sleeve 8 to support Pin 21 and spring 22 are inserted in housing 24, and one end of support pin 21 stretches out housing 24 to support bearing pad body 9, and screw plug 23 encapsulates support pin 21 and spring 22 in housing 24, and the end of spring 22 The spring force can be adjusted by adjusting the screw-in depth of the screw plug 23 . Such setting facilitates the bearing of the present utility model to play the role of temporary support and auxiliary installation during the initial installation. Other compositions and connections are the same as any one of the specific embodiments 1 to 9.

The principle of the present invention is illustrated in conjunction with Fig. 1 to Fig. 3:

The whole bearing is supported in the bearing box bracket by steel pads and gasket sets 14. The outer surface of the pads is processed to a diameter slightly smaller than the inner hole of the bearing seat. Between each pad and the bearing, gaskets are used to Adjust the vertical and horizontal position of the bearing, and then adjust the axial position of the bearing through the gasket 7, so that the rotor can be accurately positioned in the cylinder. A stop pin assembled in the bearing body slightly below the horizontal mid-section extends into a groove of the bearing housing bracket to prevent the bearing from rotating. The spherical contact between the bearing bush 8 and the bearing body 9 ensures that the bearing can be automatically adjusted according to the deflection and deformation of the rotor, so that there is a good contact between the thrust surface of the pad and the surface of the rotor thrust disc. A stop pin 6 is provided at the center of the upper half of the bearing body 9 to prevent the movement of the bearing body in the sleeve beyond the allowable range of the design.

The supporting bearing part is a four-tile tiltable pad structure, and the supporting points of the supporting pads 10 are respectively located at 45° from the upper and lower half of the bearing pad body 9 to the middle split plane, and are hung on the two oil deflector rings (the first gear) through the supporting pin 13 Oil ring 11 and the second oil deflector ring 12), the oil deflector ring is fixed on the bearing pad body 9 by bolts, so as to prevent the position of the support pad 10 from changing during operation. The supporting tiles 10 adopt point supports to ensure that the tiles are automatically adjusted as the rotor deflection changes during the operation of the unit.

The thrust part is a swing line type tile, and the positive thrust tile 2 and the negative thrust tile 3 are composed of 8 tiles respectively, and each tile is hung on the first installation ring 1 and the second installation ring 4 by a pin, wherein the first The mounting ring 1 contains an assembly margin to ensure the clearance value between the thrust pad and the rotor. The back of the positive and negative tiles is supported by wires, which can automatically tilt to form an oil wedge during operation, and a dynamic pressure oil film is formed between the surface of the tiles and the thrust plate. There are oil injection holes between the positive thrust pads, which can effectively ensure that the thrust bearing is fully lubricated to support the axial thrust of the rotor.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can also make other changes within the spirit of the present invention, and be applied to fields not mentioned in the present invention. Of course, These changes made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims (8)

1. A thrust support combined bearing for a high-speed unit, characterized in that it includes an auxiliary component, a support component and a thrust component, wherein the support component is a four-tile tiltable pad structure, and the thrust component is a swing line pad structure ; The supporting parts include a first oil deflector ring (11), a second oil deflector ring (12), a plurality of support pads (10), a bearing pad body (9) and a plurality of support pins (13), and a plurality of support pads ( 10) Arranged in a ring, and the ends on both sides of a plurality of support pads (10) are respectively connected with the first oil deflector ring (11) and the second oil deflector ring (12) through a plurality of support pins (13), the bearing pad body (9) The ring is set on a plurality of supporting pads (10), and the supporting points of the supporting pads (10) are respectively located at the position of 45° from the upper and lower half of the bearing pad body (9) to the middle split plane; the supporting parts pass through the auxiliary parts Installed in the bearing box bracket (A); The thrust component includes a first installation ring (1), a positive thrust shoe (2), a negative thrust shoe (3), a second installation ring (4), a third oil deflector ring (5) and an oil seal (20); The third oil deflector ring (5) and the oil seal (20) are installed on the left side of the bearing body (9) from left to right, and the first installation ring (1) and the second installation ring (4) are respectively installed on the bearing body ( 9), the positive thrust tile (2) and the negative thrust tile (3) are respectively hung on the first installation ring (1) and the second installation ring (4) through a plurality of pins, and the positive thrust tile (2) and the negative thrust tile (2) are The tile (3) is equipped with an oil seal (20). 2. A thrust support combined bearing for a high-speed unit according to claim 1, characterized in that: the ends on both sides of a plurality of support pads (10) are respectively connected to the first oil retainer through a plurality of support pins (13) The ring (11) is connected with the second oil deflector ring (12), and the first oil deflector ring (11) and the second oil deflector ring (12) are fixedly installed on the bearing body (9) by a plurality of bolts. 3. A thrust support combined bearing for a high-speed unit according to claim 2, characterized in that: the backs of the positive thrust pad (2) and the negative thrust pad (3) are all line supports, and can automatically tilt to form an oil bearing during operation. Wedge, so that a dynamic pressure oil film is formed between the pad surface and the thrust plate. 4. A thrust support combined bearing for a high-rotation speed unit according to claim 3, characterized in that: oil injection holes are provided between the positive thrust pads (2) and in the chamber of the negative thrust pads (3). 5. A thrust support combined bearing for a high-speed unit according to claim 4, characterized in that the auxiliary parts include steel pads, gasket assemblies (14), side gaskets (7), and bearing sleeves (8) and the stop pin (6), the bearing sleeve (8) is set on the bearing body (9), the upper half center of the bearing body (9) is provided with the stop pin (6), the steel pad, the gasket assembly (14) and The side spacers (7) are mounted on the bushing (8) and integrally mounted on the stepped shoulder of the bearing housing bracket (A). 6. A thrust support combined bearing for a high-speed unit according to claim 5, characterized in that: the bearing bush sleeve (8) and the bearing bush body (9) are in spherical contact. 7. A thrust support combined bearing for a high-speed unit according to claim 6, characterized in that: the steel spacer and the spacer assembly (14) include a spacer (14-1) and a transverse spacer (14-2 ), the horizontal spacer (14-2) is installed in the lower groove of the stepped groove and is in contact with the outer surface of the bearing sleeve (8), and the spacer (14-1) is installed on the horizontal spacer (14-2) . 8. A thrust support combined bearing for a high-speed unit according to claim 7, characterized in that it also includes a support component, the support component includes a support pin (21), a spring (22), a screw plug (23) and a shell body (24), the shell (24) is installed on the bearing sleeve (8), the support pin (21) and the spring (22) are inserted in the shell (24), and one end of the support pin (21) protrudes from the shell The body (24) supports the bearing body (9), the screw plug (23) encapsulates the support pin (21) and the spring (22) in the casing (24), and the spring force of the spring (22) can be adjusted by the screw plug ( 23) to adjust the screw-in depth.

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