WO2018202369A1

WO2018202369A1 - A compressor

Info

Publication number: WO2018202369A1
Application number: PCT/EP2018/058284
Authority: WO
Inventors: Erkan Ozkan; Yasin BATUR; Metin Gunaydin
Original assignee: Arcelik Anonim Sirketi
Priority date: 2017-05-03
Filing date: 2018-03-30
Publication date: 2018-11-08
Also published as: TR201706517A3

Abstract

A hermetic compressor (1) comprises a housing (2), a rotor provided in the housing, and a stator (3) disposed around and co-axially with the rotor (2). A coil holder (4), which is placed on the stator (3), comprises a plurality of spring holders (6) produced integrally with the coil holder (4), wherein each of said spring holders (4) has a cut-out (5) extending along its central axis. The coil holder (4) is fixed on the stator (3) by means of a plurality of stator fixing bolts (9), each one having a body (7) suitable for being passed through the cut-out (5) and a head (8).

Description

A COMPRESSOR

The present invention relates to a compressor of hermetic type.

In electronically controlled compressors, by winding the enameled wire around the stator core, coil holders generally made of plastic are used for insulation between the core and the wire, and for holding the coil in a rigid structure. Four plastic spring holders mounted on the stator are used during placement of the stator in the compressor. Problems occur in compressors due to the increase in the number of parts, vibration and long term use. Increase in number of parts increases production costs which is reflected to the customers. Another problem caused by the increase in number of parts is the parts losing their rigidity as a result of vibration and being used for a long time. Consequently, the parts cause the noise levels to increase with vibration, and this adversely effects customer satisfaction. Another problem experienced is the parts being abraded due to vibration, and the micro particles thus formed adversely effecting the operational performance of the compressor, thereby increasing energy consumption.

State of the art U.S. patent document no. US 4106881A discloses a hermetic type compressor used in coolers.

The aim of the present invention is to avoid the micro-sized particles arising from the vibration, from parts being loosened and thus being abraded, from adversely effecting the energy efficiency of the compressor.

The compressor realized to achieve the aim of the present invention and disclosed in the first claim and the dependent claims, is a hermetic type compressor having an enclosed housing. The movable parts of the compressor are enclosed by a housing and are hermetically insulated from the outer environment. A rotor and a stator disposed around and co-axially with the rotor, is provided in the compressor. By winding the enameled wire around the stator, plastic or similar dielectric coil holders are used for the purpose of insulation between the stator and the wire and to hold the coil in a rigid structure. During placement of the stator in the compressor housing, spring holders are used to fix the stator. The spring holders have a cut-out in the middle, and stator fixing bolts are placed into said cut-out. The spring holders have a frusto-conical shape whose tip is cut. The spring holders being produced integrally with the coil holder, provide ease of production and reduce the number of parts, minimizing faulty workmanship during production. The stator fixing bolts comprise a head portion and a body portion.

In an embodiment of the invention, between the spring holder and the stator fixing bolt, a spacer made of metal is provided, having a cylindrical shape with a bore passing through its central axis. The stator fixing bolt passes through the bore in the middle of the spacer and is fixed in the stator. By means of the bolt head, torque is applied during assembly on the stator fixing bolt settling on the spacer, and the stator fixing bolt and the spring holder may thus be damaged as a consequence. By means of said spacer, the stator fixing bolt does not get damaged due to high torque, and also the spacer functions as a seat for the stator fixing bolt, thereby improving production costs.

In an embodiment of the invention, the vertical cross-section of the spacer is U shaped. By means of the U shaped structure, the spacer enables to fit onto the protrusion on the inner surface of the spring holder facing the cut-out in such a way that said two parts do not move with respect to each other. By this, the stator fixing bolt, spacer and the spring holder are not effected from the vibrations generated as a result of the compressor's operation, the operational efficiency of the compressor is thus enhanced while minimizing the noise level of the compressor, thereby improving user satisfaction.

In an embodiment of the invention, the portion of the stator fixing bolt contacting the spacer, is made of metal. The stator fixing bolt is thus prevented from being damaged during tightening, improving production costs.

In an embodiment of the invention, upon placement of the stator fixing bolt to its seat in the spring holder, a screw head cover is used for minimizing the movement of the stator fixing bolt and for filling the cut-out of the spring holder. The screw head cover settles on the screw head and fills the cut-out such that it becomes almost completely flush with the spring holder. The screw head cover has a U shape whose ends are bent backwards. The screw head cover interposes between the screw head and the spring holder by means of said bent ends, and the stator fixing bolt is thus prevented from being effected from vibrations, thereby minimizing the noise level of the compressor, improving customer satisfaction.

The advantage of the present invention is the realization of a compressor whose operational efficiency is enhanced and production is facilitated by reducing the number of parts in hermetic compressors.

The compressor realized to achieve the aims of the present invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a sectional view of a hermetic compressor.

Figure 2 is an exploded view of the stator and the coil holder.

Figure 3 is the view from above, of the position in which the coil holder is disposed on the stator.

Figure 4 is a view of the A section shown in Figure 3.

The elements in the figures are numbered individually and the correspondence of these numbers are given hereinafter.

1. Compressor

2. Housing

3. Stator

4. Coil holder

5. Cut-out

6. Spring holder

7. Body

8. Head

9. Stator Fixing Bolt

10. Spacer

11. Screw Head Cover

The hermetic compressor (1) comprises a housing (2), a rotor provided in the housing (2) and a stator (3) disposed around and co-axially with the rotor, and a coil holder (4) placed on the stator (3).

The hermetic compressor (1) of the invention comprises a plurality of spring holders (6) produced integrally with the coil holder (4), having a cut-out (5) extending along its central axis, and a plurality of stator fixing bolts (9) having a body (7) passing through the cut-out (5), and a head (8) enabling fixing the coil holder (4) on the stator (3) by fitting on the spring holder (6) upon the body (7) being passed through the cut-out (5).

The hermetic compressor (1) of the invention comprises a plurality of spring holders (6) produced integrally with the coil holder (4), having a cut-out (5) extending along its central axis, and a plurality of stator fixing bolts (9) having a body (7) and a head (8), settling on the spring holder (6) by means of the cut-out (5), suitable for fixing the coil holder (4) and the stator (3) to each other. In the compressor (1) of the invention, coil holders (4) fixed on the utilized stator (3) are used for holding the coil. By means of the spring holders (6) being produced integrally with the coil holders (4), the coil holder (4) and the spring holder (6) are produced by means of a single mold, thereby reducing molding costs. Another advantage of the invention is avoiding problems of the compressor (1) such as loosening and displacement of the parts during operation and reducing the noise levels of the compressor (1), by reducing the number of parts. In addition, the spring holders (6) are prevented from being damaged or shattered in the compressor (1) by coming loose from their seats, and the spring holder (6) parts are prevented from damaging the compressor (1) by slipping into the movable parts of the compressor (1), thereby improving maintenance and spare part costs.

The hermetic compressor (1) of the invention comprises a cylindrical ring shaped metal spacer (10) positioned between the spring holder (6) and the stator fixing bolt (9). An end of the stator fixing bolt (9) is positioned in the stator (3) by settling of the stator fixing bolt (9) on the spring holder (6). The stator fixing bolts (9) are tightened by being torqued during fixing of the stator fixing bolt (9) in the spring holder (6). Spacers made of plastic or similar soft materials can become deformed during this process. Thanks to the spacer (10) made of metal, the spacer (10) can withstand high torque force during assembly, thereby reducing production defects and therefore improving production costs.

In another embodiment of the invention, the spacer (10) placed between the spring holder (6) and the stator (3) in the hermetic compressor (1) has a spiral shape. By means of the spacer (10) being produced with a spiral shape, the spacer (10) is placed into the holes provided on the stator (3), advances along the hole and settles into its seat in the spring holder (6) by flexing. The spiral shape opens during said settling. The spacer (10) is thus easily placed into the spring holder (6), facilitating production.

The hermetic compressor (1) of the invention comprises a spacer (10) whose vertical cross-section is U shaped in outwards direction from the center. The region on the spring holder (6) corresponding to the spacer (10) protrudes so as to be suitable for the U shape of the spacer (10), and the spacer (10) thus settles in the spring holder (6) so as to be stationary. By this, the spacer (10) fits stationary on the spring holder (6), and vibration and noise levels generated during operation of the compressor (1) are reduced, thereby improving user satisfaction.

The hermetic compressor (1) of the invention comprises a stator fixing bolt (9) whose portion contacting the spacer (10) is made of metal. The stator fixing bolt (9) is composed of a body (7) and a head (8). The portion of the body (7) adjacent to the head (8), and the portion of the head (8) adjacent to the body (7) are made of metal. By this, the stator fixing bolt (9) is prevented from being damaged due to the torque applied during its placement in the spring holder (6), thereby reducing production defects of products and improving product costs.

The hermetic compressor (1) of the invention comprises a screw head cover (11) whose ends have bent U shape, fixing the stator fixing bolt (9) in the spring holder (6) by settling on the spring holder (6). The stator fixing bolt (9) is fixed in the spring holder (6) by settling on the spacer (10). The screw head cover (11) is used to cover the space remaining on the spring holder (6), in the position in which the stator fixing bolt (9) settles on the spacer (10). Thanks to its inverse U shaped structure, the screw head cover (11) settles on the head (8) of the stator fixing bolt (9), and fits in the space between the stator fixing bolt (9) and the spring holder (6) with the help of the protrusions on the edges of the U shape, and fills said space. By this, the head (8) is locked to the spring holder (6) by being tightened and couples with the spring holder (6) so as not to have relative movement, thereby preventing the stator fixing bolts (9) from being displaced from the spring holder (6) and loosening due to vibration generated during operation of the compressor (1). Consequently, the head (8) is prevented from moving by being displaced and being abraded due to vibration generated by the operation of the compressor (1). The micro particles forming due to abrasion increases the energy consumption and reduces the operational efficiency of the compressor (1).

The hermetic compressor (1) of the invention is suitable for use in cooler appliances.

By means of the invention, the coil holder (4), spring holder (6) and the stator fixing bolt (9) used in compressors and provided on the stator (3), are enabled to be rigidly placed to each other, and the noise levels generated due to vibration are minimized, improving user satisfaction.

Claims

A hermetic compressor (1) comprising a housing (2), a rotor provided in the housing (2), and a stator (3) disposed around and co-axially with the rotor, and a coil holder (4) placed on the stator (3), characterized by

- a plurality of spring holders (6) produced integrally with the coil holder (4), having a cut-out (5) extending along its central axis, and by

- a plurality of stator fixing bolts (9) having a body (7) suitable for being passed through the cut-out (5) and a head (8) enabling fixing the coil holder (4) on the stator (3) by fitting on the spring holder (6) upon the body (7) being passed through the cut-out (5).
A hermetic compressor (1) according to claim 1, characterized by a cylindrical ring shaped metal spacer (10) positioned between the spring holder (6) and the stator fixing bolt (9).
A hermetic compressor (1) according to claim 2, characterized by the spacer (10) whose vertical cross-section is U shaped in outwards direction from the center.
A hermetic compressor (1) according to claims 2 to 3,characterized by the stator fixing bolt (9) whose portion contacting the spacer (10) is made of metal.
A hermetic compressor (1) according to any one of the preceding claims, characterized by the screw head cover (11) whose ends have bent U shape, fixing the fixing bolt (9) in the spring holder (6) by settling on the spring holder (6).
A hermetic compressor (1) according the any one of the preceding claims, suitable for use in cooler appliances.