WO2015165529A1

WO2015165529A1 - Hermetic reciprocating compressor and method for manufacturing the same

Info

Publication number: WO2015165529A1
Application number: PCT/EP2014/058850
Authority: WO
Inventors: Nazim Arda EYYUBOGLU; Serkan Kara
Original assignee: Arcelik Anonim Sirketi
Priority date: 2014-04-30
Filing date: 2014-04-30
Publication date: 2015-11-05

Abstract

The present invention relates to a hermetic reciprocating compressor (1) for use in a refrigeration appliance. The compressor (1) comprises a compressor-kit (2) for compressing a refrigerant, a casing (3) for hermetically enclosing the compressor-kit (2), wherein the casing has an upper part (3a) and a base part (3b) and at least one spring element (4) for supporting the compressor-kit (2). The compressor (1) of the present invention comprises at least one projection (5) which is press-formed into the base part (3b). The projection (5) extends upwards into the casing (3).

Description

HERMETIC RECIPROCATING COMPRESSOR AND METHOD FOR MANUFACTURING THE SAME

The present invention relates to a hermetic reciprocating compressor for use in a refrigeration appliance, in particular a domestic refrigerator. The present invention more particularly relates to a support mechanism for mounting a compressor-kit into a casing of the hermetic reciprocating compressor. The present invention also relates to a method of manufacturing a hermetic reciprocating compressor having a support mechanism.

Fig. 1 shows a conventional reciprocating compressor (1´). Fig. 2 shows a base part (3b´) of a casing (3) utilized to hermetically enclose a compressor-kit (2´) of the conventional reciprocating compressor (1´). In the conventional reciprocating compressor (1´), the compressor-kit (2´) is generally mounted on a support mechanism (4a´, 5´) inside the casing (3´). As shown in Fig. 2, in the conventional reciprocating compressor (1´) the support mechanism (4a´, 5´) is arranged on the base part (3b´) of the casing (3´). Fig. 3 shows the support mechanism (4a´, 5´) in more detail. The support mechanism (4a´, 5´) usually includes four springs (4a´) for damping the vibrations generated by the motor (2n´,2o´) and the piston mechanism (2k´, 2l´, 2m´). Fig. 4 shows a vertical section of the support mechanism (4a´, 5´). A lower end of each spring (4a´) is attached to a corresponding pin (5´) on the base part (3b´) whereas an upper end of each spring (4a´) is mounted to the compressor-kit (2´), in particular to the cylinder block (2a´).

In the manufacturing method of the conventional reciprocating compressor (1´), the base part (3b´) is formed by machine pressing, in particular by deep drawing a metal sheet (6´). Subsequently, the base part (3b´) and the pins (5´) are joined by welding.

A problem with this conventional reciprocating compressor (1´) is that when the pins (5´) are not correctly welded to their designated positions, the compressor-kit (2´) cannot be properly attached to the base part (3b´) and the damping performance degrades due to the manufacturing errors.

WO 2010/003896 (A1) discloses a conventional reciprocating compressor which has a hermetically sealed housing. The compressor-kit thereof is mounted to the base of the housing by means of springs. The springs are respectively attached to a plurality of peg-shaped mounting elements provided on the housing base.

An objective of the present invention is to provide a hermetic reciprocating compressor and a method of manufacturing the same which overcomes the aforementioned drawbacks of the prior art in a cost-effective way and which enables easy manufacturing and assembly of the compressor-kit without compromising the damping performance.

This objective has been achieved by the hermetic reciprocating compressor as defined in claim 1 and the manufacturing method as defined in claim 8. Further achievements have been attained by the subject-matters respectively defined in the dependent claims.

The hermetic reciprocating compressor of the present invention comprises one or more than one projection which is press-formed into the base part. The projection extends upwards into the casing and has a size and shape which allows attaching a corresponding spring element. A lower end of the spring element is attached to the projection and an upper end of the spring element is attached to the compressor-kit.

In an embodiment, the hermetic reciprocating compressor has four projections which are press-formed into the base part. In this embodiment, four spring elements are respectively attached to the projections so as to support the compressor-kit and damp the vibrations when the compressor is put into operation.

In the manufacturing method of the present invention one or more than one projection is formed on a metal sheet by machine pressing, in particular by deep drawing. Thereby, the base part including a desired number of projections can be formed from the metal sheet in a single process step by using a corresponding die.

With the manufacturing method of the present invention, the projections can be formed at their designated positions in the base part with an improved accuracy. Thus, the damping performance can be secured to a high standard. In addition by the present invention, the material costs for the auxiliary pins and the labor costs for the welding of the pins to the base part have been entirely saved. By virtue of the press-formed projections, additional labor costs for the chamfering and debarring of the pins have also been saved. In addition, with the omission of the solid pins, a weight of the hermetic reciprocating compressor has been further reduced. With the present invention, the compressor can be manufactured and assembled in a cost effective way without compromising the damping performance.

Additional advantages of the hermetic reciprocating compressor of the present invention and the manufacturing method of the present invention will become apparent with the detailed description of the embodiments with reference to the accompanying drawings in which:

Figure 1 – is a schematic vertical sectional view of a conventional hermetic reciprocating compressor;

Figure 2 – is a schematic perspective view of a support mechanism inside a base part of a casing of the conventional hermetic reciprocating compressor in Fig. 1;

Figure 3 – is a schematic enlarged perspective view of the support mechanism of the conventional hermetic reciprocating compressor shown in Fig.2;

Figure 4 – is a schematic vertical sectional view of the support mechanism of the conventional hermetic reciprocating compressor shown in Fig.3;

Figure 5 – is a schematic vertical sectional view of a hermetic reciprocating compressor according to an embodiment of the present invention;

Figure 6 – is a schematic perspective view showing a support mechanism in a base part of a casing of the hermetic reciprocating compressor shown in Fig.5;

Figure 7 – is a schematic enlarged perspective view of the support mechanism of the hermetic reciprocating compressor shown in Fig. 6;

Figure 8 – is a schematic vertical sectional view of the support mechanism of the hermetic reciprocating compressor shown in Fig. 7;

The reference signs appearing on the drawings relate to the following technical features.

Compressor
Compressor-kit

2a. Cylinder block
2b. Compression chamber
2c. Cylinder head
2d. Exhaust chamber
2e. Intake chamber
2f. Valve assembly
2g. Exhaust port
2h. Intake port
2i. Suction silencer
2j. Exhaust silencer
2k. Piston head
2l. Piston rod
2m. Crank shaft
2n. Rotor
2o. Stator
3. Casing

3a. Upper part

3b. Base part
4. Spring element

4a. Coil spring
5. Projection

5a. Body portion
5b. Tip portion
5c. Seating portion
6. Metal sheet

The hermetic reciprocating compressor (1) is suitable for use in a refrigeration appliance (not shown), in particular a domestic refrigerator (Figs. 5 to 8).

The hermetic reciprocating compressor (1) comprises a compressor-kit (2) for compressing a refrigerant, a casing (3) for hermetically enclosing the compressor-kit (2) and at least one spring element (4) for supporting the compressor-kit (2). The casing (3) has an upper part (3a) and a base part (3b) (Fig. 5).

The hermetic reciprocating compressor (1) of the present invention comprises at least one projection (5) which is press-formed into the base part (3b). The projection (5) extends upwards into the casing (3). The projection (5) has a size and shape configured to attach to the spring element (4). A lower end of the spring element (4) is attached to the projection (5) and an upper end of the spring element (4) is attached to the compressor-kit (2) (Figs. 5 to 8).

The refrigeration appliance of the present invention comprises the hermetic reciprocating compressor (1) according to the present invention (Figs. 5 to 8).

In an embodiment, the compressor-kit (2) comprises a cylinder block (2a) which has a compression chamber (2b), a cylinder head (2c) which has an exhaust chamber (2d) and an intake chamber (2e), a valve assembly (2f) which is arranged between the cylinder block (2a) and the cylinder head (2c), wherein the valve assembly (2f) has an exhaust port (2g) and an intake port (2h), a suction silencer (2i) which is located on a upstream side of the intake chamber (2h), an exhaust silencer (2j) which is located on a downstream side of the exhaust chamber (2h), a piston head (2k) which is arranged to reciprocate inside the compression chamber (2b), a piston rod (2l) which is coupled to the piston head (2k), a crank shaft (2m) which is eccentrically coupled to the piston rod (2l) and rotatably mounted the cylinder block (2a), a rotor (2n) which is fixed to the crank shaft (2m) and a stator (2o) which is fixed to the cylinder block (2a) (Figs. 5 to 8).

In another embodiment, the hermetic reciprocating compressor (1) further comprises four projections (5) which are press-formed into the base part (3b) and four spring elements (4) which are respectively attached to the projections (5) (Figs. 5 to 8).

In another embodiment, each projection (5) comprises a cup-shaped body portion (5a) which is press-formed in the base part (3b) (Fig. 8).

In another embodiment, each projection (5) comprises a truncated cone-shaped tip portion (5b) which is press-formed in the base part (3b) (Fig. 8).

In another embodiment, each projection (5) is surrounded by a flat seating portion (5c) which is press-formed into the base part (3b). The flat seating portion (5c) is configured to bear the spring element (4) (Fig. 8).

In another embodiment, each spring element (4) is a compression coil spring (4a) which is compress-fitted to a corresponding projection (5). In an alternative embodiment, each spring element (4) is made from a rubber material which is compress-fitted to a corresponding projection (5).

The manufacturing method comprises a step of forming from a metal sheet (6) by machine pressing the base part (3b) of the casing (3). The casing (3) is suitable for hermetically enclosing the compressor-kit (2) of the hermetic reciprocating compressor (1).

In the manufacturing method of the present invention, at least one projection (5) is formed on the metal sheet (6) by machine pressing. The press-formed projection (5) extends upwards into the casing (3) and has a size and shape which allows attaching a spring element (4) to the same for supporting the compressor-kit (2) and damping the vibrations which are generated when hermetic reciprocating compressor (1) is taken into operation.

In an embodiment, in the forming step a die including a female and a male part (not shown) are utilized to form the base part (3b) concurrently with each projection (5) from the metal sheet (6) by machine pressing, preferably by deep drawing. Thereby the base part (3b) is obtained in a single operation.

In another embodiment, in the forming step four projections (5) are formed on the metal sheet (6) by machine pressing.

In another embodiment, a body portion (5a) of each press-formed projection (5) is cup-shaped.

In another embodiment, a tip portion (5b) of each press-formed projection (5) is truncated cone-shaped.

In another embodiment, in the forming step one or more than one flat seating portion (5c) is formed on the metal sheet (6) by machine pressing. Each projection (5) is surrounded by a flat seating portion (5c).

In another embodiment, in the forming step the base part (3) including the projections (5) is formed from the metal sheet (6) by deep drawing.

In another embodiment, after the forming step, a spring element (4) is attached to each projection (5). In a version of this embodiment, each spring element (4) is a compression coil spring (4a). In an alternative version of this embodiment, the spring element (4) is made from rubber material.

With the manufacturing method of the present invention, the hermetic reciprocating compressor (1) can be manufactured and assembled in an easy and a cost effective way without compromising the damping performance. The material costs for the auxiliary pins (5´) and the labor costs for welding the pins (5´) to the base part (3b´) and chamfering, debarring the pins (5´) have been saved. Thereby, the total number of steps of the manufacturing method has been reduced. With the omission of the solid pins (5´), a weight of the hermetic reciprocating compressor (1) has been further reduced.

Claims

A hermetic reciprocating compressor (1) for use in a refrigeration appliance, in particular a domestic refrigerator, the hermetic reciprocating compressor (1) comprising a compressor-kit (2) for compressing a refrigerant, a casing (3) for hermetically enclosing the compressor-kit (2), wherein the casing (3) has an upper part (3a) and a base part (3b) and at least one spring element (4) for supporting the compressor-kit (2),

characterized in that at least one projection (5) which is press-formed into the base part (3b), wherein the projection (5) extends upwards into the casing (3), wherein the projection (5) has a size and shape configured to attach to the spring element (4) and wherein a lower end of the spring element (4) is attached to the projection (5) and an upper end of the spring element (4) is attached to the compressor-kit (2).
The hermetic reciprocating compressor (1) according to claim 1, characterized in that four projections (5) which are press-formed into the base part (3b) and four spring elements (4) respectively attached to the projections (5).
The hermetic reciprocating compressor (1) according to claim 1 or 2, characterized in that the each projection (5) comprises a cup-shaped body portion (5a) which is press-formed in the base part (3b).
The hermetic reciprocating compressor (1) according to any one of claims 1 to 3, characterized in that each projection (5) comprises a truncated cone-shaped tip portion (5b) which is press-formed in the base part (3b).
The hermetic reciprocating compressor (1) according to any one of claims 1 to 4, characterized in that each projection (5) is surrounded by a flat seating portion (5c) which is press-formed into the base part (3b), wherein the flat seating portion (5c) is configured to bear the spring element (4).
The hermetic reciprocating compressor (1) according to any one of claims 1 to 5, characterized in that each spring element (4) is a compression coil spring (4a) which is compress-fitted to a corresponding projection (5).
A refrigeration appliance, in particular a domestic refrigerator comprising a hermetic reciprocating compressor (1) as defined in any one of claims 1 to 6.
A method of manufacturing a hermetic reciprocating compressor (1) for use in a refrigeration appliance, in particular a domestic refrigerator,

the manufacturing method comprising

- a step of forming from a metal sheet (6) by machine pressing a base part (3b) of a casing (3) which is suitable for hermetically enclosing a compressor-kit (2) of the hermetic reciprocating compressor (1),

the manufacturing method being characterized in that

- in the forming step at least one projection (5) is formed on the metal sheet (6) by machine pressing, wherein the projection (5) extends upwards into the casing (3) and wherein the projection (5) has a size and shape which allows attaching a spring element (4) for supporting the compressor-kit (2).
The manufacturing method according to claim 8, characterized in that in the forming step four projections (5) are formed on the metal sheet (6) by machine pressing.
The manufacturing method according to any one of claims 8 to 9, characterized in that a body portion (5a) of each projection (5) is cup-shaped.
The manufacturing method according to any one of claims 8 to 10, characterized in that a tip portion (5b) of each projection (5) is truncated cone-shaped.
The manufacturing method according to any one of claims 8 to 11, characterized in that in the forming step one or more than one flat seating portion (5c) is formed on the metal sheet (6) by machine pressing, wherein each projection (5) is surrounded by a flat seating portion (5c).
The manufacturing method according to any one of claims 8 to 12, characterized in that in the forming step the base part (3) inclusive each projection (5) is formed from the metal sheet (6) by deep drawing.
The manufacturing method according to any one of claims 8 to 13, characterized in that a step of attaching a spring element (4) to each projection (5).
The manufacturing method according to claim 14, characterized in that each spring element (4) is a compression coil spring (4a).