WO2010012891A1

WO2010012891A1 - Method of creating a compressor shell ring

Info

Publication number: WO2010012891A1
Application number: PCT/FR2009/000925
Authority: WO
Inventors: Philippe Adelhanoff; Igor Adelhanoff; Nicolas Berne
Original assignee: Adel
Priority date: 2008-07-28
Filing date: 2009-07-24
Publication date: 2010-02-04
Also published as: FR2934185A1

Abstract

The present invention relates to a method of manufacturing a shell ring (V) for a scroll‑type compressor, this shell ring comprising a larger‑diameter part (1) known as the bottom part, designed to accommodate a lower bearing, and a smaller‑diameter part (3) known as the top part, designed to accommodate a top bearing (9), this method being characterized in that it involves a step of locally deforming the shell ring at its smaller‑diameter part and near the larger‑diameter part so as to form at least one at least partially peripheral internal radial support (20) against which the top bearing can rest cleanly, and also relates to such a shell ring.

Description

Process for producing a compressor shell

The present invention relates to a method of manufacturing ferrule for scroll compressor, and the ferrule obtained by this method. This type of compressor (also called "scroll compressor" according to the English terminology) can be used in particular for the compression of refrigerants in large air conditioning systems.

As is known from the prior art (see in particular EP 0 593 747), a scroll compressor typically comprises an outer shell or shell, having a larger diameter portion, and a smaller diameter portion.

The part of larger diameter, called the lower part, is intended to accommodate the electric motor of the compressor, and the smaller diameter portion, said upper part, is intended to accommodate the compression members properly bet, namely a a fixed spiral, and on the other hand a mobile spiral driven by the electric motor.

The mobile spiral is fixed on a shaft pivotally mounted inside two bearings, one said lower bearing, located in the lower part of the ferrule, and the other, said upper bearing, located in the upper part of the ferrule.

Conventionally, these two bearings are mounted by force in their respective ferrule parts.

In addition, it is important to mechanically maintain the bearings. Currently, maintaining the upper bearing is either through a shoulder over the entire circumference provided inside the shell or by performing welding between the ferrule and the bearing.

Such a mode of maintenance has several disadvantages. First, the realization of this shoulder by removal of material in the shell complicates the production of this piece. Then, due to the removal of material, the thickness of the sheet being reduced, the mechanical characteristics of the part are reduced. In addition, the resumption of machining of the upper part of the ferrule to achieve the said shoulder, is to alter the lack of positioning of coaxiality between the upper part (machined), and the lower part which remains raw. In the case of a fixing by welding, it should be noted that the upper bearing is generally made of cast iron and the ferrule being usually made of steel, welding operations are delicate and often cause leaks.

The present invention is thus particularly intended to provide a method for overcoming these disadvantages. To do this, the invention relates to a method of manufacturing a ferrule for a scroll compressor, this ferrule comprising a part of larger diameter, called the lower part, adapted to receive a lower bearing, and a smaller part diameter, said upper part, adapted to receive an upper bearing, this method being characterized in that it comprises a step of local deformation of the ferrule at its part of smaller diameter and near the larger diameter portion so as to form at least one radial at least partially peripheral inner support capable of allowing a free support of the upper bearing.

Thus, the inner supports intended to maintain the upper bearing are directly formed from the body of the ferrule. The body of the ferrule can therefore be easily made, the supports being made by subsequent deformation. This avoids welding operations or removal of material for making the supports during the manufacture of the body of the shell, or the deterioration of the coaxiality between the upper part and the lower part of the part. Preferably, the deformation is carried out so that the support has a radial width of the order of one millimeter.

Advantageously, four supports are made uniformly distributed over the periphery of the ferrule.

Advantageously, the local deformation step is performed using a knife. This allows a precisely localized deformation and the realization of fine supports.

The realization of these supports by deformation without removal of material can allow a possible reduction of the thickness of the sheet used for the realization of the ferrule. The present invention also relates to a ferrule obtained by means of a process according to the invention.

Advantageously, the ferrule is made of steel.

The invention also relates to a method of manufacturing a scroll compressor, characterized in that it comprises the step of obtaining a ferrule according to the invention, and to force a bearing upper in said upper part, so that this bearing comes to bear against said supports made in the ferrule.

The invention finally relates to a scroll compressor obtained by means of a method according to the invention. Other features and advantages of the present invention will emerge in the light of the description which follows, and on examining the appended figures in which:

FIG. 1 is a perspective view of a compressor shell according to the invention, FIG. 2 is a plan view of the shell of FIG. 1,

- Figure 3 is a schematic representation of an upper step intended to be introduced into the ferrule of Figures 1 and 2.

FIG. 4 is a diagrammatic view in longitudinal section of the ferrule of FIGS. 1 and 2. Reference is now made to FIGS. 1 and 2, in which it can be seen that the ferrule V of a scroll compressor according to the invention comprises a part of larger diameter 1, said lower part, and a smaller diameter portion 3, said upper part, these two parts being interconnected by a joining portion 5, inclined relative to the axis A of the ferrule. The lower part 1 has several orifices, and in particular an orifice 7 for admitting a refrigerant to be compressed.

As is known per se, such a ferrule can be obtained from a steel sheet then rolled to obtain a cylinder.

The two edges of this cylinder coming in opposite are then welded, then this cylinder undergoes a stamping operation so as to form the joining part 5.

It is only to finish that in this cylinder are made the orifice 7 and other orifices by punching.

As has been indicated in the preamble of the description, a lower bearing (not shown) is forcibly mounted in the lower part 1, and an upper bearing 9 is intended to be mounted by force in the upper part 3. These two bearings are intended to receive a shaft at the end of which is fixed a so-called mobile spiral, capable of rotating inside a fixed spiral.

These spirals, not shown in the accompanying figures, are in the upper zone delimited by the upper bearing 9 and by the edge 13 of the upper part 3 of the ferrule V. The operation of a scroll compressor comprising such a ferrule is known per se and described here simply for the purpose of memory: a refrigerant arrives under low pressure in the lower part 1 of the ferrule via the orifice 7, and is conducted in the zone superior, inside the space separating the fixed and mobile spirals.

Under the effect of the rotation of the mobile spiral relative to the fixed spiral, the fluid is gradually driven towards the center of these spirals, and thus undergoes a gradual compression allowing it to reach high pressures. This fluid is then discharged from the central zone of these spirals to the outside, generally via an orifice formed on a bell attached to the upper part 3 of the ferrule, as is taught for example by the document EP 0 593 747.

As indicated in the preamble of the present patent application, the issues of maintaining the upper bearing 9 inside the upper part 3 of the ferrule V are essential.

The present invention provides a method for answering this question.

To do this, in accordance with the invention, the method for producing the ferrule comprises a step of locally deforming the ferrule substantially at the level of the upper part 3 near the inclined section 5, the deformation step consisting in using a knife to form in the body of the ferrule V supports 20 extending radially inwardly of the ferrule over a distance of about one millimeter. These supports 20 are intended to allow the maintenance of the plateau 9.

In this case, the ferrule V shown in Figures 1, 2 and 3 has four supports 20 uniformly distributed on the device of said ferrule.

This free support characteristic obtained in a very simple way makes it possible in particular to make a scroll compressor made in accordance with the invention compatible with the new standards in force in this field.

Of course, the present invention is not limited to the embodiment described and shown, provided as a simple example.

Claims

1. A method of manufacturing a ferrule (V) for a scroll compressor, said ferrule comprising a part of larger diameter (1), said lower part, adapted to receive a lower bearing, and a smaller diameter portion (3). ), said upper part, adapted to receive an upper bearing (9), this method being characterized in that it comprises a step of local deformation of the ferrule at its part of smaller diameter and near the part of larger diameter so as to form at least one radial support (20) at least partially inner peripheral capable of allowing a free support of the upper bearing.

2. Method according to claim 1, characterized in that the deformation is carried out so that the support (20) has a radial width of the order of one millimeter.

3. Method according to any one of claims 1 or 2, characterized in that four supports (20) are made uniformly distributed over the periphery of the ferrule (V).

4. Method according to any one of claims 1 to 3, characterized in that the local deformation step is performed using a knife.

5. Ferrule (V) obtained by means of a method according to one of claims 1 to 4.

6. Ferrule (V) according to claim 5, characterized in that it is steel.

7. A method of manufacturing a scroll compressor, characterized in that it comprises the step of obtaining a shell (V) according to one of claims 5 or 6, and to force a top bearing (9) in said upper part (3), so that the bearing (9) abuts against said supports (20) made in the shell.

Spiral compressor obtained by a process according to claim 7.