WO2011076651A1

WO2011076651A1 - A hermetic compressor comprising an insulating element

Info

Publication number: WO2011076651A1
Application number: PCT/EP2010/069845
Authority: WO
Inventors: Tugba Cetinturk
Original assignee: Arcelik Anonim Sirketi
Priority date: 2009-12-23
Filing date: 2010-12-16
Publication date: 2011-06-30
Also published as: CN102725942A; EP2517337A1; CN102725942B

Abstract

The present invention relates to a hermetic compressor (1) suitable for being used in cooling devices such as refrigerators comprising a casing (2), a stator (5) located in the casing (2), having a stator stack (3) composed of laminations and one or more than one winding (4) composed of conducting wires wound on the slots on the stator stack (3), a winding head (6) forming the portion of the stator stack (3) extending towards outside from the opposite faces thereof, a compressor block (7) carrying basic mechanical elements such as cylinder, piston, crank and piston rod, seated on the upper side of the stator stack (3) such that the lower surface thereof does not contact the upper side of the winding head (6) and an insulating element (10) produced from plastic and providing insulation between the winding head (6) and the compressor block (7).

Description

A HERMETIC COMPRESSOR COMPRISING AN INSULATING ELEMENT

[0001] The present invention relates to a hermetic compressor comprising an insulating element placed on the stator windings.

[0002] The stator of the hermetic compressor motor used in cooling devices such as refrigerators, is produced by placing windings composed of conducting wires into the slots on the stator stack composed of magnetic sheets and the windings form the parts referred to as winding head by extending towards the outside through the opposite faces of the stator stack.

Moreover, in the hermetic compressor a metal compressor block placed on the stator and the compressor block carries basic mechanical elements such as cylinder, piston, crank and piston rod. The compressor block is seated onto the stator stack such as to be over the winding head. A gap of minimum 2 mm has to be left between the compressor block and the winding head for security reasons such that no current jump (electric leakage) between the winding wires and the block occur when current is applied to the stator windings. In order to create the said gap, stator windings are pressed in special presses to be formed. In most situations, the number of stator windings requires to be increased for positive contribution to compressor motor efficiency; however the safety gap required to be left between the compressor block and the windings prevents the number of windings from being increased. In order to solve this problem, in the state of the art, insulating elements produced from thin isolative plastic film having a thickness of 0.15-0.20 mm are placed between the stator winding head and the compressor block, however placing these insulating elements into the compressor motor creates problems especially in terms of labor due to the shape of the winding head and the compressor block.

[0003] In International Patent Application No. WO2008145760, an insulating

element placed between the coil core and the winding head is explained. The insulating element comprises a peripheral edge region seating onto the coil core and additional insulating extensions providing insulation between the flange extensions of the cylinder housing and the winding head.

[0004] In United States Patent No. US5957671 , a film is explained which is used in the stator of the electric motor of a compressor, which provides insulation between the winding head and the compressor block, which is mounted onto the bearing part in the center of the compressor block by means of an opening situated in the middle thereof by being pushed.

[0005] The aim of the present invention is the realization of a hermetic

compressor comprising an insulating element easily mountable placed onto the stator windings.

[0006] The hermetic compressor realized in order to attain the aim of the present invention, and explicated in the first claim and the respective claims thereof comprises a stator having the stator stack to which the windings composed of conducting wires are placed, a winding head composing the portion of the windings extending towards outside from the upper surface of the stator stack and a compressor block seated on the upper surface of the stator stack and a ring shaped (toroidal) insulating element produced from plastic and mounted onto the winding head.

[0007] The vertical cross-section of the insulating element having toroidal body is in downward facing C shape, the insulating element has a housing placed therein and into which the winding head is placed.

[0008] In an embodiment of the present invention, the insulating element is

produced from heat shrink material. In this embodiment the insulating element shrinks by being heated after being mounted onto the winding head, adheres onto the winding head and a permanent connection is obtained by taking the shape of the winding head.

[0009] In another embodiment of the present invention, the insulating element has an opening formed by cutting out a portion of the ring-shaped body and enables the electrical connections of the winding heads extending towards outside from the winding head. Since the opening is located in alignment with the recess on the compressor block, there is no risk of the winding head contacting the compressor block at the region where the opening is located.

[0010] The insulating element is fitted to the winding head, is easily mounted onto the winding head due to its ring shape surrounding the winding head like a sleeve and provides insulation by covering the winding head. No binding cord holding the windings together is required on the winding head on which the insulating element is used.

[001 1] The hermetic compressor realized in order to attain the aim of the present invention is illustrated in the attached figures, where:

[0012] Figure 1 - is the cross sectional view of a hermetic compressor.

[0013] Figure 2 - is the perspective view of a compressor block.

[0014] Figure 3 - is the perspective view of an insulating element.

[0015] Figure 4 - is the perspective view of a stator.

[0016] Figure 5 - is the perspective view of a stator on which an insulating

element is mounted.

[0017] The elements illustrated in the figures are numbered as follows:

1. Hermetic compressor

2. Casing

3. Stator stack

4. Winding

5. Stator

6. Winding head

7. Compressor block

8. Body

9. Housing

10. Insulating element

1 1. Opening

The hermetic compressor (1) suitable for being used in cooling devices such as refrigerators comprises a casing (2), a stator (5) located in the casing (2), having a stator stack (3) composed of laminations and one or more than one winding (4) composed of conducting wires wound on the slots on the stator stack (3), more than one winding head (6) forming the portions of the windings (4) extending towards outside from the opposite faces of the stator stack (3) and a compressor block (7) carrying and/or bearing basic mechanical elements such as cylinder, piston, crank and piston rod, mounted onto the upper side of the stator stack (3) such that the lower surface thereof does not contact the upper side of the winding head (6).

[0019] The hermetic compressor (1) of the present invention comprises a

ring-shaped (toroidal) insulating element (10) produced from plastic material, mounted onto the winding head (6) and surrounding the winding head (6) like a sleeve.

[0020] The insulating element (10) has a body (8) the vertical cross-section of which is in downward facing C shape and a housing (9) located in the body (8) and into which the winding head (6) is placed.

[0021] The housing (9) is enlarged by stretching the arms of the body (8) forming the C-shape such as to move away from each other to mount the insulating element (10) to the winding head (6) and the insulating element (10) is mounted onto the winding head (6) by being pushed in the axial direction by means of an easy manual labor.

[0022] In an embodiment of the present invention, the insulating element (10) is produced from heat shrink material.

[0023] In this embodiment, after the insulating element (10) is mounted to the winding head (6), the stator (5) is placed into an oven the temperature of which is adjusted for this operation and the insulating element (10) is heated. The insulating element (10) adheres to the windings (4) by shrinking due to heat and takes the shape of the winding head (6), a permanent connection is obtained.

[0024] In an embodiment of the present invention, the insulating element (10) comprises an opening (1 1 ) formed by cutting out a portion of the body (8) and when the insulating element (10) is mounted to the winding head (6), which enables the electrical connections of the winding (4) ends extending towards outside from the winding head (6) by being aligned with the portion where the electrical connections of the winding (4) ends are made.

[0025] In this embodiment, the insulating element (10) does not cover the winding head (6) at the region where the opening (1 1 ) is located. The electrical connections are made by extending the winding (4) ends towards outside from the winding head (6) at the region where the opening (1 1 ) is located. Furthermore, one or more than one recess (G) is disposed on the compressor block (7) to decrease the material weight as in the prior embodiments, since the opening (1 1 ) is aligned with the recess (G) on the compressor block (7), there is no risk of the compressor block (7) to contact the winding head (6) at the region where the opening (1 1 ) is located.

[0026] The insulating element (10) is easily mounted onto the winding head (6) by means of the ring shape thereof having almost the same dimensions with winding head (6) and provides insulation between the compressor block (7) and the winding head (6) by covering the winding head (6) like a sleeve. In the hermetic compressor (1) of the present invention, no binding cord holding the windings (4) together is required on the winding head (6), savings of binding cord material and of seam labor are provided.

[0027] It is to be understood that the present invention is not limited by the

embodiments disclosed above and a person skilled in the art can easily introduce different embodiments. These should be considered within the scope of the protection postulated by the claims of the present invention.

Claims

1. A hermetic compressor (1 ) comprising a casing (2), a stator (5) located in the casing (2), having a stator stack (3) composed of laminations and one or more than one winding (4) composed of conducting wires wound on the slots on the stator stack (3), more than one winding head (6) forming the portions of the windings (4) extending towards outside from the opposite faces of the stator stack (3) and a compressor block (7) mounted onto the upper surface of the stator stack (3), characterized by a ring-shaped (toroidal) insulating element (10) produced from plastic material, mounted onto the winding head (6) and surrounding the winding head (6) like a sleeve.

2. A hermetic compressor (1 ) as in Claim 1 , characterized by the insulating

element (10) having a body (8) the vertical cross-section of which is in downward facing C shape and a housing (9) located in the body (8) and into which the winding head (6) is placed.

3. A hermetic compressor (1 ) as in Claim 1 or 2, characterized by the insulating element (10) produced from heat shrink material.

4. A hermetic compressor (1 ) as in any one of the claims above, characterized by the insulating element (10) comprising an opening (1 1 ) formed by cutting out a portion of the body (8) and enabling the electrical connections of the winding (4) ends extending towards outside from the winding head (6).

5. A hermetic compressor (1 ) as in Claim 4, characterized by the insulating

element (10) comprising the opening (1 1 ) aligned with the recess (G) on the compressor block (7).