WO2017137328A1

WO2017137328A1 - A compressor that is operated in a silent manner

Info

Publication number: WO2017137328A1
Application number: PCT/EP2017/052415
Authority: WO
Inventors: Emirhan ULUG
Original assignee: Arcelik Anonim Sirketi
Priority date: 2016-02-09
Filing date: 2017-02-03
Publication date: 2017-08-17

Abstract

A hermetic compressor (1), used preferably in refrigerators, comprises: an electric motor (2) having a rotor (3) and a stator (4), a crankshaft (5) fixed onto the rotor (3), a rod (6) connected to the crankshaft (5), a piston (7) connected to the rod (6), and a cylinder block (8) having a compression chamber (9) wherein the piston (7) compresses the refrigerant fluid. The cylinder block (8) comprises at least one foot (10) that enables the cylinder block (8) to be fixed onto the stator (4), wherein a dampening member (11) is disposed between the stator (4) and the cylinder block (8) for preventing vibrations emitted from the stator (4) from being transmitted to the cylinder block (8).

Description

A COMPRESSOR THAT IS OPERATED IN A SILENT MANNER

The present invention relates to a compressor comprising a cylinder block that has the compression chamber thereon, wherein the fluid in the cooling cycle is compressed.

In hermetic compressors used in cooling devices, the movement of the piston that compresses the refrigerant fluid is provided by an electric motor. The rotor of the electric motor is connected to the crankshaft and the crankshaft transmits the movement to the pistons by means of a rod. The compression chamber into which the pistons moves forwards and backwards is disposed on a cylinder block. The cylinder block is fixed on the stator of the electric motor. When the compressor is operated, the electric motor is energized and the rotor starts to rotate. A vibration occurs on the stator due to the magnetic field. Moreover, another vibration occurs due to the movement of the rotor depending on the rotational speed of the rotor. The forward-backward movement of the pistons also create a similar vibration. The vibrations generated due to the electric motor and the movement of the pistons are transmitted to the body of the compressor and create a whirring noise that can be heard from the outside. In an ideal compressor, it is desired to dampen the vibrations generated in the compressor before being transmitted to the outer body of the compressor.

In the state of the art International Patent Application No. WO2015127998, a compressor is disclosed, having a damping means that is disposed between the stator and the compressor body and that provides the damping the vibrations on the stator before being transmitted to the body.

In the state of the art US Patent Application No. US20140070469, a compressor is disclosed, having a damping means that is disposed between the cylinder block and the compressor body and that provides the damping the vibrations on the cylinder block before being transmitted to the body.

In the state of the art US Patent Application No. US2005053485, a compressor is disclosed, having a damping means that is disposed between the stator feet and the compressor body and that has a resonance frequency not corresponding to the frequency of the vibrations on the stator.

The aim of the present invention is the realization of a compressor that is operated with less noise.

The compressor realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a dampening member that is disposed between the stator of the electric motor and the cylinder block with the compression chamber and that prevents the vibrations generated on the stator from being transmitted to the cylinder block. The vibrations generated on the stator are transmitted to the dampening member and the dampening means absorbs the vibrations and prevents the vibrations from being transmitted to the cylinder block. By means of the dampening member, the vibrations are dampened at the source without increasing. Thus, the compressor is enabled to be operated with less noise.

In another embodiment of the present invention, the dampening member are disposed into grooves arranged on the stator and/or the cylinder block. Thus, the dampening member is prevented from creating an elevation between the cylinder block and the stator, thereby keeping the dimensions of the compressor the same.

In another embodiment of the present invention, the ends of the feet where the cylinder block is connected to the stator are thinned down so as to allow the dampening member to be mounted thereover. In this embodiment, the dimensions of the compressor are kept the same.

In another embodiment of the present invention, the dampening member is a spring that is tightly squeezed between the stator and the cylinder block, meaning that is not free. In this embodiment, by preventing the dampening member from stretching, it is aimed that the latter dampens the vibrations directly on itself.

In another embodiment of the present invention, the dampening member is produced from elastic material. Thus, the vibrations are dampened without reaching the cylinder block, in other words without the magnitude thereof increasing or causing noise.

By means of the present invention, the vibrations on the stator are prevented from being transmitted to the cylinder block, thus the vibrations are enabled to be dampened without their amplitude increasing, in other words without the vibrations creating a higher noise by expanding over a larger mass. By dampening the vibrations at the source region, the compressor is enabled to be operated with less noise. Different from the state of the art samples, the dampening member is not connected to the compressor body or casing, thus the vibrations generated inside the compressor are dampened again in the compressor.

The compressor realized in order to attain the aim of the present invention is illustrated in the attached figures, where:

Figure 1 - is a cross-sectional view of a compressor.

Figure 2 – is the perspective view of the stator and the cylinder block in an embodiment of the present invention.

Figure 3 – is the cross-sectional view of the stator and the cylinder block in an embodiment of the present invention.

Figure 4 – is the cross-sectional view of the stator and the cylinder block in another embodiment of the present invention.

The elements illustrated in the figures are numbered as follows:

Compressor
Electric motor
Rotor
Stator
Crankshaft
Rod
Piston
Cylinder block
Compression chamber
Foot
Dampening member
Groove

In household appliances, preferably in cooling devices, the circulation of the refrigerant fluid used for refrigeration is provided by a hermetic reciprocating compressor (1).

The compressor (1) comprises an electric motor (2) having a rotor (3) and a stator (4) disposed around the rotor (3) so as to be concentric with the rotor (3); a crankshaft (5) that is fixed onto the rotor (3); a rod (6) whereto the crankshaft (5) is connected; a piston (7) whereto the rod (6) is connected, and a cylinder block (8) that has a compression chamber (9) wherein the piston (7) compresses the refrigerant fluid and at least one foot (10) that enables the cylinder block (8) to be fixed onto the stator (4) (Figure 1).

In the compressor (1), the rotor (3) starts to rotate as the electric motor (2) is energized. The rotational movement of the rotor (3) is converted into linear movement by means of the crankshaft (5) so as to be transmitted to the piston (7) by means of the rod (6). The piston (7) enables the refrigerant fluid to be pressurized in the compression chamber (9) by moving forwards and backwards. The compression chamber (9) is disposed on the cylinder block (8) and the cylinder block (8) is fixed onto the stator (4) by means of the feet (10). The feet (10) and the stator (4) are fixed to each other preferably by means of fixing elements such as bolt, etc.

The compressor (1) of the present invention comprises a dampening member (11) that is disposed between the stator (4) and the cylinder block (8) and that prevents the vibrations emitted from the stator (4) from being transmitted to the cylinder block (8) (Figure 2).

In the compressor (1) of the present invention, the dampening member (11) is disposed between the stator (4) and the cylinder block (8). The dampening member (11) is preferably around the bolt connecting the stator (4) and the feet (10) and the bolts are torqued so that the vibrations generated by the stator (4) are dampened by the dampening member (11). While the vibrations generated by the stator (4) are transmitted to the cylinder block (8) over the feet (10), by means of the dampening member (11) of the present invention, the generated vibrations are dampened on the dampening member (11). Thus, the vibrations generated on the stator (4) are dampened at the source of the vibrations. By dampening the vibrations generated on the stator (4) without the magnitude thereof increasing, the compressor (1) is enabled to be operated with less noise. The dampening member (11) furthermore prevents the vibrations generated due to the movement of the piston (7) from being transmitted to the stator (4) over the cylinder block (8).

In an embodiment of the present invention, the dampening member (11) prevents the contact between the stator (4) and the cylinder block (8). In this embodiment, by preventing the contact between the stator (4) and the cylinder block (8), the vibrations generated on the stator (4) and the cylinder block (8) are prevented from being transmitted to each other (Figure 2). In this embodiment, contrary to what is known, the dampening member (11) is disposed between the stator (4) and the cylinder block (8) in a pre-stressed manner without leaving any room for flexibility, the bolt between the stator (4) and the cylinder block (8) is prevented from getting loose.

In another embodiment of the present invention, the compressor (1) comprises a groove (12) that is arranged on the feet (10) and/or the stator (4) and wherein the dampening member (11) is fitted. In this embodiment, a groove (12) is formed on the stator (4) and/or the feet (10) so as to prevent the dimensions of the compressor (1) from increasing and the dampening member (11) fulfills its function by being disposed into the dampening member (11) (Figure 4).

In another embodiment of the present invention, the end of the foot (10) is thinned down so as to allow the dampening member (11) to be mounted thereover. In this embodiment, different from the above-described embodiment, the dampening member (11) is disposed to the thinned area at the end of the foot (10), not into the groove (12) arranged at the inner part of the foot (10). In other words, the dampening member (11) is fitted around the foot (10) (Figure 3).

In another embodiment of the present invention, the dampening member (11) is a pre-tensioned spring, in other words without any room for flexibility. In this embodiment, by preventing the dampening member (11) from stretching, the vibrations transmitted from the stator (4) are enabled to be dampened on the dampening member (11). In this embodiment, the vibrations on the stator (4) are attenuated and prevented from being transmitted to the cylinder block (8). In other words, the dampening member (11) functions as a vibration spring whereon the vibrations are dampened, rather than a shock absorber.

In another embodiment of the present invention, the dampening member (11) is produced from elastic material. In this embodiment, the dampening member (11) is produced from an elastic material such as rubber, etc. In this embodiment, the vibrations on the stator (4) are enabled to be dampened on the dampening member (11).

In another embodiment of the present invention, the dampening member (11) dampens vibrations at about 50 Hz. The electric motor (2) is energized with the mains power. Therefore, the vibrations are generated on the stator at about 50 Hz due to the mains power. The dampening member (11) is configured so as to dampen the vibrations generated due to the mains power. The mains power oscillates at the frequency of 50 Hz ± 1 Hz The dampening member (11) is configured so as to dampen the vibrations between 49 to 51 Hz. In different embodiments of the present invention, the dampening member (11) can be configured so as to dampen vibrations at different frequencies.

By means of the dampening member (11) used in the compressor (1) of the present invention, the vibrations generated on the compressor (1) are dampened without being transmitted to the body or the casing of the compressor (1). Moreover, by positioning the dampening member (11) between the stator (4) and the cylinder block (8), the vibrations generated on the stator (4) and the cylinder block (8) are prevented without their magnitude increasing.

Claims

A compressor (1) comprising an electric motor (2) having a rotor (3) and a stator (4) disposed around the rotor (3) so as to be concentric with the rotor (3) and a cylinder block (8) having at least one foot (10) that enables the latter to be fixed onto the stator (4), characterized by a dampening member (11) that is disposed between the stator (4) and the cylinder block (8) and that prevents the vibrations emitted from the stator (4) from being transmitted to the cylinder block (8)
A compressor (1) as in Claim 1, characterized by a groove (12) that is arranged on the feet (10) and/or the stator (4) and wherein the dampening member (11) is fitted.
A compressor (1) as in Claim 1 or 2, characterized by the foot (10) with the end thereof being thinned down so as to enable the dampening member (11) being fitted thereover.
A compressor (1) as in any one of the above claims, characterized by the dampening element (11) that is a pre-tensioned spring.
A compressor (1) as in any one of the Claims 1 to 4, characterized by the dampening member (11) that is produced from elastic material.