RU2373438C2 - Fastener assembly of thrust crown of oil bearings on shaft - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention refers to compressor engineering, particularly to fastener assemblies of crowns of thrust oil bearings on shaft of centrifugal compressor machines. The fastener assembly of thrust crown of oil bearings on the shaft consists of a facility preventing shifting of the crown along axis of the shaft and of a facility preventing slipping of the crown around the shaft. The facility preventing slipping of the crown around the shaft is made in form of a tape out of elastic material with lengthwise corrugation located between the thrust crown and the shaft in a circular slot. The slot is made on surface of the thrust crown or shaft.

EFFECT: increased manufacturability and possibility to apply less strict allowances for shaft diametres and thrust crown after mechanical treatment; prevention of fretting corrosion; increased rate of assembly; compensation of axis misalignment and reduction of noise in some cases.

5 cl, 4 dwg

Description

The invention relates to compressor engineering, in particular to thrust oil bearings of centrifugal compressor machines, and can be used in compressor machines with sliding bearings to ensure the durability of the bearing mount on the rotor shaft, and therefore to improve the reliability of the compressor.

Known mount the ridge of the thrust on the shaft of the rotor [see Shnepp VB, “Design and Calculation of Centrifugal Compressor Machines”, M.: Mechanical Engineering, 1995, p. 240, ill. 133]. The thrust comb is mounted on the shaft and is fixed from longitudinal movement by a nut through the spacer sleeve. From turning, the thrust comb is fixed with a key.

The disadvantages of this method of installation of the thrust comb are:

- the occurrence of fretting corrosion of the mating surfaces of the neck of the shaft and ridge resistant due to the variability of contact pressure;

- the presence of keyways to prevent the mating parts from turning relative to each other, which is an additional stress concentrator in both parts;

- the need to use tighter tolerances on both parts to ensure minimum clearance.

The technical task of the invention is to remedy these disadvantages and at the same time ensure the manufacturability of the manufacture of this place of the bearing.

The problem is solved in that the attachment site of the persistent ridge of oil bearings on the shaft consists of means to prevent the ridge from moving along the axis of the shaft, and means to prevent the ridge from turning around the shaft, made in the form of a tape of elastic material with longitudinal corrugation, which is placed between the persistent ridge and a shaft in an annular groove made on the surface of the thrust ridge or shaft.

The use of a longitudinal grooved tape with a constant size of hollows and protrusions located in an annular groove between the surfaces of the shaft and the thrust bearing flange provides the necessary flange tension on the shaft, which, in turn, eliminates the occurrence of fretting corrosion, since the occurrence of variable contact pressures on the interface is eliminated.

форму.Preferably, the tape in cross section may have

form.

An annular groove on the mating surface of the shaft or thrust ridge serves to provide a centered layout of the mating parts. Its dimensions correspond to the width and height of the corrugated tape. To ensure a secure fit of the tape, the corners of the annular groove are rounded along a small radius r.

The tape is made of an elastic material, such as spring steel, stamped before quenching and tempering.

The tool that prevents the offset of the ridge along the axis of the shaft can be made in the form of a cylindrical sleeve mounted on the shaft and fixed, for example, with a nut in the longitudinal direction.

The essence of the invention is illustrated using the drawings. Figure 1 shows a cross section of the proposed attachment according to the first embodiment, and figure 2 shows a fragment A in figure 1. In Fig.3 - the same as in Fig.1, according to the second embodiment; figure 4 - fragment B in figure 3.

формы, которая размещена между упорным гребнем 1 и валом 2 в кольцевом пазу 5 упорного гребня 1 (фиг.2).According to the first embodiment (Fig. 1), the attachment site of the persistent ridge 1 of oil bearings on the shaft 2 consists of means for preventing the ridge from moving along the axis of the shaft 2, made in the form of a cylindrical sleeve 3 mounted on the shaft 2, and means for preventing the ridge 1 from turning around a shaft 2 made in the form of a tape 4 with longitudinal corrugation of spring steel, preferably

form, which is placed between the thrust ridge 1 and the shaft 2 in the annular groove 5 of the thrust ridge 1 (figure 2).

формы в поперечном сечении, т.е. имеет в поперечном сечении профиль с углублением в средней части. Лента 4 размещена между упорным гребнем 1 и валом 2 в кольцевом пазу 6 вала 2 (фиг.4).According to the second variant (Fig. 3), the attachment point of the persistent ridge 1 of the oil bearings on the shaft 2 also consists of means for preventing the ridge from moving along the axis of the shaft 2, made in the form of a cylindrical sleeve 3 mounted on the shaft 2, and means for preventing the ridge 1 from turning around the shaft 2, made in the form of a tape 4 with longitudinal corrugation of spring steel, preferably

cross-sectional shapes, i.e. has a cross-sectional profile with a recess in the middle part. The tape 4 is placed between the thrust ridge 1 and the shaft 2 in the annular groove 6 of the shaft 2 (figure 4).

The corners of the annular groove are rounded by a small radius r to ensure a secure fit of the tape.

The use of a ribbed ribbed ridge during installation has many technical and economic advantages:

- elimination of the possibility of fretting corrosion;

- increase assembly speed;

- ensuring an interference fit, which allows using less tight tolerances on both mating parts;

- allows you to prevent turning parts from arising moments and centrifugal forces with the exception of the use of dowels, studs, pins, etc .;

- automatic compensation of certain misalignment values, and in some cases even noise reduction is possible.

The ability to compensate for the difference in the linear expansion coefficients between the mating parts, while ensuring the required tightness and reliable fastening.

Thus, the proposed assembly of the installation of the ridge of a thrust thrust bearing of centrifugal compressor machines using an allowable corrugated tape provides higher manufacturability with the possibility of applying less tight tolerances on the diameters of the shaft and ridge of the thrust after machining, i.e. this method can be used in the case of boring mating surfaces under a larger diameter than required. By selecting an allowable corrugated tape of a certain size.

Claims (5)

1. The fastening assembly of the persistent ridge of oil bearings on the shaft, consisting of means to prevent the ridge from moving along the axis of the shaft, and means to prevent the ridge from turning around the shaft, characterized in that the means to prevent the ridge from turning around the shaft is made in the form of a tape of elastic material with longitudinal corrugation, which is placed between the thrust ridge and the shaft in an annular groove made on the surface of the thrust ridge or shaft. 2. The mount according to claim 1, characterized in that the longitudinal corrugation of the tape in cross section has

form. 3. The mount according to claim 1, characterized in that the angles of the annular groove are rounded. 4. The mount according to claim 1, characterized in that said tape is made of spring steel. 5. The attachment point according to claim 1, characterized in that the means preventing the offset of the ridge along the axis of the shaft is made in the form of a cylindrical sleeve mounted on the shaft and fixed in the longitudinal direction.

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