RU2337257C2 - Reversing plain bearing (versions) - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: in compliance with the first version, the reversing plain bearing incorporates housing, lubricant feed and discharge channels, shaft with external blocks, each furnished with radial bore in its working surface center, pockets, locking oval head screws, oil scrapers arranged between the aforesaid blocks. Two additional pockets are arranged symmetrically on every side of the aforesaid pocket, and two additional radial bores are made on both side of the aforesaid radial bore. In compliance with the second version, the reversing plain bearing incorporates housing, lubricant feed and discharge channels, shaft with external blocks, each furnished with radial bore in its working surface center, pockets, locking oval head screws, oil scrapers arranged between the aforesaid blocks. Note that, at least, one block is additionally furnished with the second pocket and the second radial bore.

EFFECT: increased bearing capacity.

9 cl, 5 dwg

Description

The invention relates to the field of mechanical engineering, namely to self-aligning shoe bearings, and can be used in the construction of high-speed compressors, gas and steam turbines, pumps and other rotary machines.

Known designs of bearings with self-aligning pads on a hydrostatic suspension, having one central or offset in the direction of rotation of the hydrostatic pocket.

Sliding bearings with pads with a central pocket are reversible and can work when the shaft rotates clockwise or counterclockwise, but their disadvantage is the low bearing capacity and unstable operation due to the non-vertical path of the shaft in the bearing. Avoid these shortcomings pads with a hydrostatic pocket, offset in the direction of rotation.

A known bearing assembly comprising a housing with lubrication channels and a drain cavity, a shaft covered by self-aligning blocks, each of which has a radial hole made in the central part of its working surface, and distribution grooves made in the inlet and outlet edges, central pockets made on the inner surface of the body, fixing screws, oil scraper installed in the inter-deck space [UA No. 74963 C2, F16C 32/00, 2004].

The disadvantage of this design is the irreversibility, in which the operation of the bearing in the opposite direction is impossible, because in this case there is no possibility of the appearance of a hydrodynamic carrier film.

The basis of the invention is the task to create a reversible plain bearing with high bearing capacity.

The problem is solved in that in a reversible plain bearing, comprising a housing with lubricant supply channels and a drain cavity, a shaft covered by self-aligning blocks, each of which has a radial hole, and distribution grooves, hydrostatic pockets, fixing screws with spherical heads, oil scraper from wear-resistant material installed in the inter-deck space according to the invention two additionally symmetrically made on both sides of each hydrostatic pocket Yelnia hydrostatic pocket, and on the two sides of the self-setting of the radial holes Pads - two additional radial holes.

In the second embodiment, the task is solved by the fact that in a reversible plain bearing containing a housing with lubricant supply channels and a drain cavity, a shaft covered by self-aligning blocks, each of which has a radial hole, hydrostatic pockets, fixing screws with spherical heads, oil scraper wear-resistant material installed in the inter-deck space according to the invention, at least one self-aligning shoe is additionally made w swarm hydrostatic pocket and a second radial hole, both the hydrostatic pockets and the radial holes are placed symmetrically.

In both cases, hydrostatic pockets can be made on the supporting surface of the self-aligning blocks or on the inner surface of the bearing housing.

Oil scraper made reversible.

The reversing bearing has two locking screws with a spherical head.

The execution on two sides of each hydrostatic pocket symmetrically of two additional hydrostatic pockets or the execution of at least one self-aligning block of two hydrostatic pockets helps to increase the bearing capacity of the reversing bearing.

The implementation of oil scraper reversible improves cooling due to the reduction of heat transfer from block to block.

Due to the fact that the reversing bearing has two locking screws with a spherical head, the self-aligning shoe is prevented from shifting when rotating both clockwise and counterclockwise.

The invention is illustrated by drawings.

Figure 1 shows a reversible plain bearing according to the first embodiment, a cross section;

figure 2 is a reversible plain bearing according to the second embodiment, a cross section;

figure 3 is a section along aa of figure 1, figure 2;

figure 4 - the work of self-aligning pads when rotating counterclockwise;

figure 5 - the work of the self-aligning pads during rotation clockwise.

The reversing plain bearing comprises a housing 1 with channels 2 for supplying lubricant and a drain cavity, a shaft 3 covered by self-aligning blocks 4.

According to the first embodiment (Fig. 1), each of the self-aligning pads has a radial hole 5 in the central part of its working surface, a hydrostatic pocket 6 on the supporting surface of the self-aligning pads 4. Two additional pockets 7, 8 are symmetrically made on the two sides of each hydrostatic pocket 6, and on both sides of the radial hole 5 of the self-aligning shoe 4, two additional radial holes 9, 10.

According to the second embodiment (Figure 2), each of the self-aligning blocks 4 has two hydrostatic pockets 7, 8 and two radial holes 9, 10.

In both cases, hydrostatic pockets 6, 7, 8 can also be made on the inner surface of the bearing housing 1.

The reversing bearing has two locking screws 11 with spherical heads, oil scraper reversible scrapers 12 of wear-resistant material installed in the inter-deck space 13.

Reversible bearing operates as follows.

When the shaft 3 is rotated, the lubricant supplied by the directional oil supply flows from the oil supply system of the turbomachine through the channels 2 for supplying lubricant to the working surfaces of the self-aligning blocks 4.

During operation of the reversible bearing, each self-aligning block 4 rests on a self-generated hydrostatic film of oil. This film is formed as a result of the selection of an insignificant part (about 10%) of the hydrodynamic lubricant film on the working surface of the self-aligning shoe 4 in order to create hydrostatic pressure in the pockets 6, 7, 8. Bearing operation is reversed by changing the pressure in the pockets 6, 7, 8. When rotation in the direction of the sequence of hydrostatic pockets 7, 6, 8, the hydrostatic pressure in the pockets increases in the direction of the sequence of hydrostatic pockets 7, 6, 8. When rotating in the direction of In the case of hydrostatic pockets 8, 6, 7, the hydrostatic pressure in the pockets increases in the direction of the sequence of hydrostatic pockets 8, 6, 7. Such a distribution of hydrostatic pressure provides the formation of hydrodynamic pressure, which provides high bearing capacity when the shaft rotates in one or the other direction.

Figure 4 and Figure 5 shows the pressure distribution of the oil film between the shaft 3 and the self-aligning block 4 during rotation of the bearing counterclockwise and clockwise, respectively.

Claims (9)

1. A reversible plain bearing, comprising a housing with lubrication channels and a drain cavity, a shaft covered by self-aligning blocks, each of which has a radial hole in the central part of its working surface, hydrostatic pockets, locking screws with spherical heads, oil scraper tubes made of wear-resistant material, installed in the inter-deck space, characterized in that on the two sides of each hydrostatic pocket two additional hydrostatic are symmetrically made pockets, and on both sides of the radial hole of the self-aligning shoe - two additional radial holes. 2. The reversible plain bearing according to claim 1, characterized in that the hydrostatic pockets are made on the supporting surface of the self-aligning pads. 3. The reversible plain bearing according to claim 1, characterized in that the hydrostatic pockets are made on the inner surface of the bearing housing. 4. The reversible plain bearing according to claim 1, characterized in that the oil scraper is made reversible. 5. The reversible plain bearing according to claim 1, characterized in that it has two locking screws with a spherical head. 6. A reversible plain bearing, comprising a housing with lubricant supply channels and a drain cavity, a shaft covered by self-aligning blocks, each of which has a radial hole in the central part of its working surface, hydrostatic pockets, locking screws with spherical heads, oil scraper tubes made of wear-resistant material, installed in the inter-deck space, characterized in that in at least one self-aligning block an additional second hydrostatic car is made en and a second radial bore. 7. The reversible plain bearing according to claim 6, characterized in that the hydrostatic pockets are made on the supporting surface of the self-aligning pads. 8. The reversible plain bearing according to claim 6, characterized in that the oil scraper is made reversible. 9. The reversible plain bearing according to claim 6, characterized in that it has two locking screws with a spherical head.

Images