JPH0135191B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to a refrigerant compressor, in particular a compressor having a vertical crankshaft rotatably mounted in a casing defining a horizontal cylinder of the compressor;
The crankshaft has a pair of main journals, one of which is disposed below the crankpin and rotatable in a lower main bearing mounted in the casing, and the other above the crankpin. The present invention relates to a type of compressor that is arranged in a casing and is rotatable on an upper main bearing fixed to a casing, the main bearing is a radial shaft part, and the crankshaft is axially supported in the casing by an axial thrust bearing. .

In known compressors of this type, the thrust bearing has an upwardly facing flat annular surface and is mounted on the upper surface of the casing at the upper end of the lower main bearing. The upper end of the lower main journal of the crankshaft is formed with a collar having a flat lower annular surface that abuts on a corresponding annular surface of the casing.

[Problem to be solved] In existing compressors, both the casing and the shaft are made of cast iron, and the annular surface of the thrust bearing is a cast iron surface, but it is completely flat and the common surface of the main bearing and shaft is made of cast iron. Making it perpendicular to the axis requires extremely precise machining. In practice, the only precision machining that can be used is the lapping process, which is expensive to manufacture. Also, it took time and effort to assemble the thrust bearing and crankshaft.

The object of the invention is to provide a compressor of the above type whose axial thrust bearings can be manufactured fairly inexpensively and simply, and which operate reliably and efficiently.

[Embodiment] As shown in FIGS. 1 and 2, an airtight metal plate housing 10 has a casing 12 of a refrigerant compressor or squeeze machine of the kind currently used in Italian refrigerators, for example, in which a casing 12 is elastically suspended. has. It has a casing 12 and a cylinder 14, the cylinder 14 having a horizontal axis and housing a piston 16. The piston 16 is connected by a connecting rod 17 to a crank pin 30 of a crankshaft 18 having a vertical axis. The housing 12 carries a stator arrangement 20 of the electric motor below, which stator arrangement 20 has a rotor 22 . The rotor 22 is secured to the lower tubular extension of the crankshaft 18.

As shown in FIGS. 1 and 3, crankshaft 18 has a lower main journal 26 and an upper main journal 28. As shown in FIGS. two main journals 26,
28, the crankshaft 18 has crank pins 30 provided sequentially from the bottom upwards;
It has a counterweight 32.

As shown in FIG. 1, the lower main journal 26 is rotatably housed in a bore 34 in the casing 12 and defines a lower main bearing located directly below the crank pin 30.

The casing 12 carries a support plate 36 (see FIG. 2) formed of a cast iron plate that is bolted to the casing. The bearing plate 36 constitutes a main bearing and has for this purpose a bore 38 in which the upper main journal 28 is rotatable. Hole 38 is machined into the thicker portion of support plate 36 and has an upper center boss 40 and a lower center boss 42 located on opposite sides of support plate 36. In order to fix the plate member 36, three holes 43 for bolting are formed in the thick part of the plate member 36, and an upper boss 44 and a lower boss 46 are defined on both sides.

Plate member 36 is cast, ground and 2
The upper surfaces of the bosses 40, 44 are fabricated so that they are coplanar and parallel. Cylindrical grinding of holes 38 is performed on the flat surfaces of these bosses.

The casing 12 has an upper surface 48 that is ground flat and perpendicular to the axis of the lower bearing 34. The grinding surface of the boss 46 contacts this upper surface 48, thus achieving a parallel relationship between the axis of the hole 38 and the axis of the hole 34, while these two axes are parallel to the axis of the hole 38 and the axis of the hole 34.
The plane including the faces of the two bosses 46 coincides because they are exactly perpendicular.

Referring to FIG. 4 as well as FIGS. 1, 2, and 3, the upper annular ground surface of the boss 40 becomes a flat radial surface 50 that forms the stationary bearing surface of the axial thrust bearing of the crankshaft 18. are doing.

The rotating surface that cooperates with the thrust bearing is the annular underside of the annular member 52. The annular member 52 is constituted by a washer having a flat surface and a tab 54 consisting of a radial projection protruding from the outer periphery.

Washers are made of synthetic resin with a low coefficient of friction. A preferred material is a phenolic resin containing a solid lubricant filler. It is not technically difficult to manufacture the annular member 52 having flat parallel surfaces using this material. Furthermore, synthetic resins, especially phenolic resins, are quieter and therefore preferred for use in bearings.

An annular groove 56 is formed in a portion of the upper main journal 28 that projects above the plate member 36. A “cigar ring” (seeger ring) is placed inside this groove 56.
A resilient split ring 58, similar to those commercially known as "rings", is closely engaged. The ring 58 has an appendage or finger 60 at one circumferential end thereof. have.
The finger 60 is bent downward, and the washer 5
It engages with the radial protrusion 54 of No. 2 like a hanging plate.

The direction of rotation of crankshaft 18 is indicated by arrow A in FIG. Elastic split ring 58
is tightly engaged with the groove 56 and is fixed on the main journal 28 of the shaft 18 so that the main journal 2
8, the finger 60 carries the rotating washer 52 by engaging the projection or tab 54. In this way, slipping advantageously occurs between the back surface of the washer 52 and the upper ground surface of the boss 40, while at the same time the split ring 58
An annular bearing or suspension shoulder for the shaft 18 is formed on the washer 52.

[Effects of the Invention] In the compressor of the present invention having the above configuration, a tightening force to the shaft can be applied to the elastic split ring while the crankshaft is rotating. For this reason, the washer is securely fixed, and the washer does not vibrate during use and can rotate smoothly even without constructing an elastic split ring with high precision.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view of the press; Figure 2 is a plan view from above with the upper part of the casing removed;
The figure is an exploded perspective view of the upper part of the crankshaft, the upper main bearing, and the thrust bearing of the compressor; and FIG. 4 is an enlarged side view of the upper main journal of the crankshaft, and the axial thrust Figure 3 shows a longitudinal section of the elements attached to the journal forming the bearing; 28... Upper main journal; 36... Upper main bearing; 50... Flat radial surface; 52... Washer; 54... Radial protrusion; 56... Groove; 58
...Elastic split ring; 60...Protrusion part.

Claims (1)

[Claims] 1. A vertical crankshaft rotatably mounted in a casing having a horizontal cylinder, the crankshaft having a pair of upper and lower journals, the upper main journal above the crank pin. The main bearing is a radial bearing with a flat radial surface on the upper surface, and the crankshaft is rotated in the casing in the axial direction by an axial thrust bearing. In a supported compressor,
a washer formed of a low coefficient of friction material and having a flat surface; and an elastic split ring that engages a groove formed in the upper main journal, the washer having a flat surface between the radial surface and the elastic split ring. the elastic split ring rotates with the upper main journal and serves as a shoulder for the journal; the washer has a radial projection extending around its outer circumference; for refrigerant, characterized in that it has a protrusion bent downward so that when the radial protrusion rotates, a side surface on the side in the direction of rotation comes into contact with the radial protrusion, thereby applying a tightening force to the elastic split ring. compressor. 2. The refrigerant compressor according to claim 1, wherein the washer is made of synthetic resin. 3. The refrigerant compressor according to claim 2, wherein the synthetic resin is a phenolic resin. 4. The refrigerant compressor according to claim 2 or 3, wherein the synthetic resin contains a solid lubricant filler.