A dynamic-static pressure hybrid vertical thrust bearing structure

Abstract

The application discloses a dynamic and static pressure mixed vertical thrust bearing structure, which comprises a rotating shaft, a thrust mirror plate and a ring-shaped support frame, the rotating shaft is inserted into a vertical through hole in the center of the support frame, the top end of the rotating shaft is fixed with the middle bottom surface of the thrust mirror plate, and the thrust mirror plate is above the support frame; a downward extending ring-shaped mounting cavity is formed in the middle of the top surface of the support frame, a plurality of alloy thrust pads and non-metallic thrust pads are mounted in the ring-shaped mounting cavity, all the alloy thrust pads and the non-metallic thrust pads are arranged at intervals and are uniformly distributed in the ring-shaped mounting cavity with the vertical central axis of the support frame as the center, and the babbitt alloy layer of the alloy thrust pad and the non-metallic layer of the non-metallic thrust pad are tightly attached to the bottom surface of the thrust mirror plate. The alloy thrust pad forms static pressure lubrication, the non-metallic thrust pad forms dynamic pressure lubrication, the dynamic and static pressure lubrication of different thrust pads is combined, the normal and reliable operation of equipment is ensured, the structure is reasonable, the lubrication is reliable, the operation is stable, and the service life is long.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearing bush, more particularly to a dynamic and static pressure mixed vertical thrust bearing structure. BACKGROUND

[0002] Vertical sliding bearing is widely used in the field of motor, water turbine, generator, water pump, etc. The sliding bearing is used to support the rotating part of the equipment to ensure the safe and reliable operation of the whole unit. The thrust bearing in the sliding bearing is the only axial positioning reference in the whole unit, and it needs to bear the weight of the rotating part and all external loads during work, which is the key part of the whole equipment.

[0003] The commonly used thrust bearing includes babbitt alloy thrust pad and non-metallic thrust pad, and the lubrication mode during work includes dynamic pressure lubrication and static pressure lubrication. The friction coefficient of the alloy thrust pad is higher than that of the non-metallic thrust pad. The rotor needs to be jacked before starting after a long time of shutdown to prevent mixed friction and wear of the alloy layer of the bearing during the starting process. The babbitt alloy thrust pad has high bonding strength between the steel base and the bimetal, and the metallographic structure is compact, and the use of static pressure device has no adverse effect on the bearing. The friction coefficient of the non-metallic thrust pad is low, and the self-lubricating property is good, so the rotor can be directly started without jacking before starting. However, the bonding effect between the non-metallic layer and the steel base cannot reach the bonding between metals, and fine defects are easily generated, which affects the bonding layer when the static pressure device is added, resulting in a service life much lower than that of the babbitt alloy thrust pad. Therefore, the two kinds of thrust pads have their own limitations and cannot achieve satisfactory results in all aspects. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a dynamic and static pressure mixed vertical thrust bearing structure. The alloy thrust pad forms static pressure lubrication, and the non-metallic thrust pad forms dynamic pressure lubrication. Through the combination of dynamic and static pressure lubrication of different thrust pads, the normal and reliable operation of the equipment is ensured. The structure is reasonable, the lubrication is reliable, the operation is stable, and the service life is long.

[0005] The solution of the present application to solve the technical problem is:

[0006] A dynamic and static pressure mixed vertical thrust bearing structure, comprising a rotating shaft, a thrust mirror plate and an annular support frame, the rotating shaft is inserted into the central vertical through hole of the support frame, the top end of the rotating shaft is fixed with the middle bottom surface of the thrust mirror plate, and the thrust mirror plate is above the support frame.

[0007] The middle part of the top surface of the support frame is formed with a downwardly extending annular mounting cavity, a plurality of alloy thrust pads and non-metallic thrust pads are mounted in the annular mounting cavity, all the alloy thrust pads and non-metallic thrust pads are arranged at intervals and are uniformly distributed in the annular mounting cavity with the vertical central axis of the support frame as the center, and the babbitt layer of the alloy thrust pad and the non-metallic layer of the non-metallic thrust pad are tightly attached to the bottom surface of the thrust mirror plate.

[0008] The bottom surface of the thrust mirror plate is formed with an annular protruding portion, and the babbitt layer of the alloy thrust pad and the non-metallic layer of the non-metallic thrust pad are tightly attached to the bottom surface of the annular protruding portion.

[0009] The bottom surface of the alloy thrust pad and the non-metallic thrust pad is formed with an upper mounting groove, and the bottom surface of the corresponding annular mounting cavity is formed with a lower mounting groove, a lower support pad is mounted in the lower mounting groove, and an upper support pad is mounted in the upper mounting groove, the bottom surface of the upper support pad is a spherical surface which is pressed against the top surface of the corresponding lower support pad.

[0010] The middle part of the top surface of the babbitt layer of the alloy thrust pad is formed with a static pressure cavity, the middle part of the bottom surface of the static pressure cavity is formed with a downwardly extending recess hole, the recess hole is communicated with the central hole formed in the middle part of the top surface of the base block of the alloy thrust pad, and a side oil inlet hole is formed in the side wall of the base block, the inner end of the side oil inlet hole is communicated with the corresponding central hole.

[0011] The inner side or outer side of the base block of the alloy thrust pad and the non-metallic thrust pad is formed with a side positioning groove, the bottom surface of the outer side or inner side of the base block is formed with a lower positioning hole, a plurality of limiting pins are fixed on the bottom surface of the annular mounting cavity, the top part of the limiting pins is inserted into the corresponding lower positioning hole; a plurality of limiting blocks are fixed on the bottom surface of the annular mounting cavity, the side extending limiting portion of the limiting block is inserted into the corresponding side positioning groove.

[0012] The side vertical plate at the inner side of the annular mounting cavity is lower than the side vertical plate at the outer side, the top surface of the side vertical plate at the inner side is formed with a plurality of upper annular grooves, the top surface of the upper annular groove is close to the bottom surface of the thrust mirror plate, the top surface of the side vertical plate at the outer side is formed with a plurality of protruding rings, the upper part of the outer side wall of the thrust mirror plate is formed with a radially extending edge, the bottom surface of the radially extending edge is formed with a plurality of upper annular grooves, and the protruding ring is inserted into the corresponding upper annular groove.

[0013] The bottom surface of the upper annular groove is formed with a plurality of vertical backflow holes, the inner side wall of the side vertical plate at the inner side of the annular mounting cavity is formed with a plurality of transverse backflow holes, and the corresponding vertical backflow hole is communicated with the transverse backflow hole.

[0014] A lower annular groove is formed between the two adjacent protruding rings, the bottom surface of the lower annular groove is formed with a lower vertical hole, a plurality of outer transverse holes are formed in the inner side wall of the outer side plate of the annular mounting cavity, and the lower vertical hole is communicated with the corresponding outer transverse hole.

[0015] The outstanding effects of this invention are:

[0016] Compared with existing technologies, it adopts a hybrid structure of Babbitt alloy thrust bearings with hydrostatic devices and non-metallic thrust bearings without hydrostatic devices. During operation, the alloy thrust bearings provide hydrostatic lubrication, while the non-metallic thrust bearings use hydrodynamic lubrication. The alloy thrust bearings provide a hydrostatic oil film, which offsets part of the external load and reduces the impact of impact loads on the thrust bearings. At the same time, the non-metallic thrust bearings provide a hydrodynamic oil film and utilize their good self-lubricating properties to form a stable oil film force, ensuring the stability of the bearing during the overall operation process. Ultimately, this improves the safety and reliability of the entire unit. Its structure is reasonable, lubrication is reliable, operation is stable, and service life is long. Attached image description:

[0017] Figure 1 This is a partial structural schematic diagram of the present invention;

[0018] Figure 2 yes Figure 1 A magnified view of a portion of the image;

[0019] Figure 3 yes Figure 1 A magnified view of another part;

[0020] Figure 4 This is a partial cross-sectional view of the support frame of the present invention;

[0021] Figure 5 yes Figure 1 There are also some enlarged partial images. Detailed implementation method:

[0022] For example, see below. Figures 1 to 5 As shown, a dynamic and static pressure hybrid vertical thrust bearing structure includes a rotating shaft 10, a thrust mirror plate 20, and a ring-shaped support frame 30. The rotating shaft 10 is inserted into a central vertical through hole 31 formed in the middle of the support frame 30. The top end of the rotating shaft 10 is fixed to the bottom surface of the middle part of the thrust mirror plate 20, and the thrust mirror plate 20 is located above the support frame 30.

[0023] The top surface of the support frame 30 has a downwardly extending annular mounting cavity 32 formed in the middle. Multiple alloy thrust pads 40 and non-metallic thrust pads 50 are installed in the annular mounting cavity 32. All alloy thrust pads 40 and non-metallic thrust pads 50 are spaced apart and evenly distributed in the annular mounting cavity 32 with the vertical central axis of the support frame 30 as the center. That is, there is an alloy thrust pad 40 between two adjacent non-metallic thrust pads 50, or there is a non-metallic thrust pad 50 between two adjacent alloy thrust pads 40.

[0024] The alloy thrust pad 40 and the non-metallic thrust pad 50 both comprise a base block 5 made of steel material, the top surface of the base block 5 of the alloy thrust pad 40 is synthesized with a babbitt layer 41, and the top surface of the base block 5 of the non-metallic thrust pad 50 is adhered with a non-metallic layer 51 (such as a polytetrafluoroethylene layer or a polyether ether ketone layer, etc.).

[0025] The bottom surface of the thrust mirror plate 20 is shaped with an annular protruding part 21, which is located at the upper part of the annular mounting cavity 32, and the babbitt layer 41 of the alloy thrust pad 40 and the non-metallic layer 51 of the non-metallic thrust pad 50 are tightly attached to the bottom surface of the annular protruding part 21.

[0026] Further, the bottom surface of the alloy thrust pad 40 and the non-metallic thrust pad 50 is shaped with an upper mounting groove 1, the bottom surface of the corresponding annular mounting cavity 32 is shaped with a lower mounting groove 2, the lower supporting pad 3 is inserted into the lower mounting groove 2, the bottom surface of the lower supporting pad 3 is pressed against the bottom surface of the lower mounting groove 2, the upper part of the lower supporting pad 3 protrudes out of the lower mounting groove 2, the side wall of the lower supporting pad 3 is tightly attached to or close to the inner side wall of the lower mounting groove 2, the upper supporting pad 4 is inserted into the upper mounting groove 1, the top surface of the upper supporting pad 4 is pressed against the top surface of the upper mounting groove 1, the outer side wall of the upper supporting pad 4 is tightly attached to or close to the inner side wall of the upper mounting groove 1, the bottom part of the upper supporting pad 4 protrudes out of the bottom surface of the upper mounting groove 1, and the bottom surface of the upper supporting pad 4 is a spherical surface, which is pressed against the top surface of the corresponding lower supporting pad 3. In use, when the alloy thrust pad 40 or the non-metallic thrust pad 50 is inclined to a certain extent, the inclination is adjusted by pressing the bottom surface of the upper supporting pad 4 against the top surface of the corresponding lower supporting pad 3, so as to ensure the uniform force as much as possible.

[0027] The top surface of the babbitt layer 41 of the alloy thrust pad 40 is shaped with a static pressure cavity 42 in the middle part, the bottom surface of the static pressure cavity 42 is shaped with a downwardly extending recess hole 43 in the middle part, the top inner side wall of the recess hole 43 is shaped with a tapered side wall with a large top diameter and a small bottom diameter, the recess hole 43 is communicated with the center hole 6 shaped in the middle part of the top surface of the base block 5 of the alloy thrust pad 40, the side oil inlet hole 7 is shaped on the side wall of the base block 5, the inner end of the side oil inlet hole 7 is communicated with the corresponding center hole 6, the outer end of the side oil inlet hole 7 is screwed with the connecting pipe head 8, the outer end of the connecting pipe head 8 is connected with one end of the high-pressure hose 9, the other end of the high-pressure hose 9 is connected with the second connecting pipe head 91, the other end of the second connecting pipe head 91 is connected with the connecting through hole of the outer side plate part at the outer side of the annular mounting cavity 32, and the outer end of the connecting through hole can be communicated with the oil inlet pipe of the external oil station through the connecting pipe, so as to realize oil inlet.

[0028] Further, the inner side or the outer side of the base block 5 of the alloy thrust pad 40 and the non-metallic thrust pad 50 is formed with a side positioning groove 501 (in this embodiment, the inner side of the base block 5 is formed with a side positioning groove 501), the bottom surface of the outer side or the inner side of the base block 5 is formed with a lower positioning hole 502 (in this embodiment, the bottom surface of the outer side of the base block 5 is formed with a side positioning groove 501), the bottom of a plurality of limiting pins 503 is screwed on the bottom surface of the annular mounting cavity 32, the upper part of the screwing part of the limiting pin 503 is formed with a limiting part or a limiting nut, the bottom surface of the limiting part or the limiting nut is pressed against the bottom surface of the annular mounting cavity 32, and the top of the limiting pin 503 is inserted into the corresponding lower positioning hole 502; a plurality of limiting blocks 504 are fixed on the bottom surface of the annular mounting cavity 32 by bolts, and the top side of the limiting block 504 is formed with a side extending limiting part 505 which is inserted into the corresponding side positioning groove 501.

[0029] Further, the inner side of the annular mounting cavity 32 is lower than the outer side of the annular mounting cavity 32, the top surface of the inner side of the annular mounting cavity 32 is formed with a plurality of upper annular grooves 321, the top surface of the upper annular groove 321 is close to the bottom surface of the thrust mirror plate 20, the top surface of the outer side of the annular mounting cavity 32 is formed with a plurality of convex rings 322, the upper part of the outer side wall of the thrust mirror plate 20 is formed with a radial extending edge 22, the bottom surface of the radial extending edge 22 is formed with a plurality of upper annular grooves 23, and the convex ring 322 is inserted into the corresponding upper annular groove 23.

[0030] Further, the bottom surface of the upper annular groove 321 is formed with a plurality of vertical return flow holes 323, the inner side wall of the inner side of the annular mounting cavity 32 is formed with a plurality of horizontal return flow holes 324, and the corresponding vertical return flow hole 323 and the horizontal return flow hole 324 are communicated.

[0031] Further, a lower annular groove 325 is formed between the adjacent two convex rings 322, the bottom surface of the lower annular groove 325 is formed with a lower vertical hole 326, the inner side wall of the outer side plate of the annular mounting cavity 32 is formed with a plurality of outer horizontal holes 327, and the lower vertical hole 326 and the corresponding outer horizontal hole 327 are communicated.

[0032] The upper annular groove 321, the lower annular groove 325 and the upper annular groove 23 can all store the oil in the annular mounting cavity 32 to prevent the oil from flowing out and return to the annular mounting cavity 32 through the corresponding outer horizontal hole 327 and the horizontal return flow hole 324, thereby ensuring the sealing effect.

[0033] In use, the support frame 30 is fixed on the equipment rack, and the load of the entire equipment rotating part is transmitted through the rotating shaft 10.

[0034] In use, the shaft 10 drives the thrust mirror plate 20 to rotate after the equipment is started, and the axial load of the equipment is transmitted to the alloy thrust pad 40 and the non-metallic thrust pad 50 through the thrust mirror plate 20;

[0035] In use, the inner cavity of the support frame 30 is filled with lubricating oil, and due to the rotation of the thrust mirror plate 20, a dynamic pressure oil film is formed on the working surface of the non-metallic layer 51 of the non-metallic thrust pad 50, and the lubrication between the non-metallic layer 51 and the thrust mirror plate 20 is completely liquid friction;

[0036] In use, the external oil station supplies high-pressure lubricating oil into the static pressure cavity 42 of the alloy thrust pad 40 through the high-pressure hose 9, so that a static pressure oil film is formed on the working surface of the babbitt layer 41 of the alloy thrust pad 40, which separates the babbitt layer 41 and the thrust mirror plate 20, ensuring the reliability of lubrication; it does not need to top the shaft 10 before starting, at the same time, the alloy thrust pad 40 provides a static pressure oil film, which offsets part of the external load by using static pressure lubrication, and reduces the impact of impact load on the alloy thrust pad 40 and the non-metallic thrust pad 50, at the same time, the non-metallic thrust pad 50 provides a dynamic pressure oil film, and its good self-lubricating characteristics are used to form stable oil film force by using dynamic pressure lubrication, ensuring the stability of the whole bearing during operation, and ultimately improving the safety and reliability of the whole unit, which has reasonable structure, reliable lubrication, stable operation and long service life.

[0037] Finally, the above embodiments are only used to illustrate the present application, but not to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, therefore all equivalent technical solutions also belong to the scope of the present application, and the patent protection scope of the present application should be limited by the claims.

Claims

1. A dynamic and hydrostatic hybrid vertical thrust bearing structure comprising a rotating shaft (10), a thrust mirror plate (20) and a ring-shaped support frame (30), characterized in that: The rotating shaft (10) is inserted into the central vertical through hole (31) of the support frame (30), the top end of the rotating shaft (10) is fixed to the middle bottom surface of the thrust mirror plate (20), and the thrust mirror plate (20) is above the support frame (30); The top middle part of the support frame (30) is formed with a downward extending annular mounting cavity (32), a plurality of alloy thrust pads (40) and non-metallic thrust pads (50) are mounted in the annular mounting cavity (32), all the alloy thrust pads (40) and non-metallic thrust pads (50) are arranged at intervals and are uniformly distributed in the annular mounting cavity (32) with the vertical central axis of the support frame (30) as the center, the babbitt layer (41) of the alloy thrust pad (40) and the non-metallic layer (51) of the non-metallic thrust pad (50) are tightly attached to the bottom surface of the thrust mirror plate (20); During operation, the alloy thrust pad (40) adopts static pressure lubrication, and the non-metallic thrust pad (50) adopts dynamic pressure lubrication.

2. The hybrid hydrostatic-hydrodynamic vertical thrust bearing structure according to claim 1, characterized in that: The bottom surface of the thrust mirror plate (20) is formed with an annular protruding part (21), and the babbitt layer (41) of the alloy thrust pad (40) and the non-metallic layer (51) of the non-metallic thrust pad (50) are tightly attached to the bottom surface of the annular protruding part (21).

3. The hybrid hydrostatic-hydrodynamic vertical thrust bearing structure of claim 1, wherein: The bottom surface of the alloy thrust pad (40) and the non-metallic thrust pad (50) is formed with an upper mounting groove (1), the bottom surface of the annular mounting cavity (32) below the upper mounting groove (1) is formed with a lower mounting groove (2), a lower supporting pad (3) is mounted in the lower mounting groove (2), and an upper supporting pad (4) is mounted in the upper mounting groove (1), the bottom surface of the upper supporting pad (4) is a spherical surface, which is pressed against the top surface of the corresponding lower supporting pad (3).

4. The hybrid hydrostatic-hydrodynamic vertical thrust bearing structure of claim 1, wherein: The top middle part of the babbitt layer (41) of the alloy thrust pad (40) is formed with a static pressure cavity (42), the bottom middle part of the static pressure cavity (42) is formed with a downward extending recess hole (43), the recess hole (43) is communicated with the central hole (6) formed in the top middle part of the base block (5) of the alloy thrust pad (40), and a side oil inlet hole (7) is formed in the side wall of the base block (5), the inner end of the side oil inlet hole (7) is communicated with the corresponding central hole (6).

5. The hybrid hydrostatic-hydrodynamic vertical thrust bearing structure of claim 1, wherein: The inner side or outer side of the base block (5) of the alloy thrust pad (40) and the non-metallic thrust pad (50) is formed with a side positioning groove (501), the bottom surface of the outer side or inner side of the base block (5) is formed with a lower positioning hole (502), a plurality of limiting pins (503) are fixed on the bottom surface of the annular mounting cavity (32), the top part of the limiting pin (503) is inserted into the corresponding lower positioning hole (502), and a plurality of limiting blocks (504) are fixed on the bottom surface of the annular mounting cavity (32), the side extending limiting part (505) is inserted into the corresponding side positioning groove (501).

Images