UA20524U - Reversing slider bearing - Google Patents

Abstract

A reversing slider bearing has a body with channels for oil supply and with discharge cavity, shaft surrounded with self-aligning shoes, each of those has radial opening in central part of its working surface and hydrostatic pad at the inner surface of the body, one fixation screw with spherical head, oil-removal scrapers made of wear-proof material, those are installed in inter-shoe space. At least in one shoe second hydrostatic pad is provided, and second radial opening.

Description

Description of the invention

The utility model belongs to the field of mechanical engineering, namely, self-aligning pad 2 bearings, and can be used in the construction of high-speed compressors, gas and steam turbines, pumps and other rotary machines.

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

Sliding bearings with pads with a central hydrostatic pocket are reversible and can 70 work when rotating the shaft both clockwise and counterclockwise, but their disadvantage is a small load-bearing capacity, as well as unstable work due to the non-vertical trajectory of the shaft in the bearing.

Pads with a hydrostatic pocket offset in the direction of rotation allow these shortcomings to be avoided.

A bearing unit is known, which contains a housing with oil supply channels and a drain cavity, a shaft covered by self-aligning pads, each of which has a radial hole made in the central 72 part of its working surface, and distribution grooves made in the inlet and outlet edges, central pockets , made on the inner surface of the housing, fixing screws, oil-removal scrapers, installed in the space between the blocks (ША Mo74963 С2, Е16С 32/00, 20041.

The disadvantage of this design is its irreversibility, in which the operation of the bearing in the reverse direction is impossible due to the fact that in this case there is no possibility of the appearance of a hydrodynamic carrier film.

The purpose of the useful model is to create a reversible sliding bearing with a high bearing capacity.

The problem is solved by the fact that in the reversible sliding bearing, which contains a housing with oil supply channels and a drain cavity, a shaft covered by self-aligning pads, each of which has a radial hole in the central part of its working surface and a hydrostatic pocket, one locking screw with a spherical head, oil-removal scrapers made of wear-resistant material, installed in -) the space between the pads, according to the useful model, at least one pad has a second hydrostatic pocket and a second radial hole.

Both hydrostatic pockets and holes can be placed symmetrically.

At least one pad can be additionally equipped with a third hydrostatic pocket and a third hole, with two pockets and two radial holes placed symmetrically to the central pocket and the radial hole, respectively.

Hydrostatic pockets are made on the bearing surface of self-installing blocks. at

Hydrostatic pockets are made on the inner surface of the bearing housing. Ha")

Oil scrapers are reversible. 3o Reversible bearing can have two locking screws with a spherical head. high school

The execution of two or three hydrostatic pockets or helps to increase the bearing capacity of the reversible bearing.

Reversible oil-removal scrapers improve cooling due to the reduction of heat transfer "Ф pad to pad. C 50 Due to the fact that the reversing bearing has two locking screws with a spherical head, displacement of the pad during both clockwise and counterclockwise rotation is prevented.

And" A useful model is explained by drawings.

In Fig. 1 shows a reversible sliding bearing according to the first version, cross section; in Fig. 2 - reversible sliding bearing according to the second version, cross section; in Fig. C - section along A-A Fig. 1, Fig. 2; about in Fig. 4 - operation of self-installing pads when rotating counterclockwise; aw! in Fig. 5 - operation of self-installing pads when rotating clockwise.

The reversible sliding bearing contains a housing 1 with oil supply channels 2 and a drain cavity, and a shaft 3 covered by self-aligning pads 4. ka 20 According to the first variant of execution (Fig. 1), each of the self-aligning pads has a radial hole 5 in the central part of its working surface, hydrostatic pockets 6 on the support surface of the self-aligning blocks 4. On two sides of each hydrostatic pocket 6, two additional pockets 7, 8 are symmetrically made, and on both sides of the radial opening 5 of the self-aligning blocks 4 - two additional radial holes 9, 10.

According to the second version (Fig. 2), each of the self-installing blocks 4 has two hydrostatic 52 pockets 7, 8 and two radial holes 9, 10. c The reversible bearing has two locking screws 11 with spherical heads, oil-removal reversible scrapers 12 made of wear-resistant material , installed in the inter-pad space 13.

Reversible bearing works as follows.

When the shaft C rotates, the lubricant supplied by the directed oil supply from the oil supply system 60 of the turbo machine through the channels 2 of the lubricant supply reaches the working surfaces of the self-aligning pads 4.

During the operation of the reversible bearing, each self-aligning pad 4 rests on a self-generated hydrostatic film of lubricant. This film is created as a result of the selection of a small part (of the order of 10905) of the hydrodynamic film of lubricant on the working surface of the self-aligning pad 4 in order to create hydrostatic pressure in the pockets 6, 7, 8. The reversibility of the bearing operation is ensured by a change in the pressure in the pockets 6, 7, 8. rotating in the direction of the sequence of hydrostatic pockets 7, 6, 8, the hydrostatic pressure in the pockets increases in the sequence of hydrostatic pockets in the direction 7, 6, 8. When rotating in the direction of the sequence 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. This distribution of hydrostatic pressure ensures the formation of hydrodynamic pressure, which provides a high bearing capacity when the shaft rotates both in one and the other direction.

In Fig. 4 and Fig. 5 shows the pressure distribution of the oil film between the shaft C and the self-aligning block 4 when the bearing rotates counterclockwise and clockwise, respectively.

Claims (7)

The formula of the invention 1. Reversible sliding bearing, comprising a housing with oil supply channels and a drain cavity, a shaft surrounded by self-aligning pads, each of which has a radial hole in the central part of its working surface and a hydrostatic pocket on the inner surface of the housing, one set screw with a spherical head each , oil-removal scrapers made of wear-resistant material, installed in the inter-pad space, which is characterized by the fact that at least one pad has a second hydrostatic pocket and a second radial hole. 2. Reversible sliding bearing according to claim 1, which is characterized by the fact that both the hydrostatic pockets and the holes are placed symmetrically. 3. Reversible sliding bearing according to claim 1, which is characterized by the fact that at least one block has an additional third hydrostatic pocket and a third hole, and two pockets and two radial holes are placed symmetrically to the central pocket and the radial hole, respectively. 4. Reversible sliding bearing according to any of claims 1-3, which is characterized by the fact that the hydrostatic pockets are made on the support surface of the self-aligning blocks. 5. Reversible sliding bearing according to any of claims 1-3, which is characterized by the fact that the hydrostatic pockets are made on the inner surface of the bearing housing. 6. Reversible sliding bearing according to claim 1, which is characterized by the fact that the oil scrapers are reversible. "t zo 7. Reversible slide bearing according to claim 1, characterized in that it has two locking screws with a spherical head. c IF) "c) c Z i" name) ("c) 1 name) c" 60 b5