EP1910677B1

EP1910677B1 - A compressor

Info

Publication number: EP1910677B1
Application number: EP06780311A
Authority: EP
Inventors: Davut Ayhan Serabatir; Emre Oguz; Erkan Tarakci
Original assignee: Arcelik AS
Current assignee: Arcelik AS
Priority date: 2005-08-04
Filing date: 2006-08-03
Publication date: 2010-01-20
Anticipated expiration: 2026-08-03
Also published as: CN101238293B; ES2339053T3; KR20080033477A; KR100932254B1; DE602006011903D1; EP1910677A1; ATE455960T1; CN101238293A; SI1910677T1; WO2007015222A1; BRPI0611050A2

Abstract

The present invention relates to a connection mechanism (8) that provides the refrigerant fluid circulating in the refrigerant cycle of the compressors (1) to be delivered to the suction muffler (5) or the cylinder head (4) after it enters the compressor (1), attenuating the vibrations of the compressor (1) motor in both the radial and axial directions, preventing the transmittance of the motor vibrations to the casing (2), helping to balance the inner pressure and providing pressure balancing within the casing (2). The connection mechanism (10) comprises a disc shaped damper (10) made of elastic material.

Description

The present invention relates to a compressor utilized in cooling devices wherein the refrigerant fluid is delivered to the suction muffler by means of a connection mechanism.
In the hermetic compressors utilized preferably in the cooling devices, a suction muffler made of plastic material is used in attenuating the noise resulting from the refrigerant fluid and the refrigerant vapor with decreased temperature, and pressure received from the evaporator is delivered to the suction muffler or the suction volume on the cylinder head by means of the connection ducts. In these implementations, since the refrigerant fluid delivered from the evaporator is not mixed with the hot gases within the compressor casing, it reaches the cylinder unheated, however, pressure losses increase as it flows through the connection ducts and the compressor is strained at the starts-up. In the implementations where the refrigerant fluid is delivered directly to the suction muffler or the cylinder, the vibrations of the components like the motor, crank, piston rod etc. within the compressor casing can be transmitted to the casing by way of the connection ducts. The connection ducts are supported by additional connection parts to be able to function under vibrational and high temperature conditions for long periods of time; however, these additional parts make the assembly of the compressor more difficult, sufficient performance cannot be achieved due to the small size of the casing and other geometric limitations. Bellows-like connection parts are utilized for attenuating the vibrational motion of the movable components and for providing a certain flexibility between the compressor inlet and the suction muffler, however the desired outcome for long term functioning and durability cannot be achieved. Even though the connection ducts having a bellows-like structure provide the desired flexibility and leak-proofing, after some period of time they tend to become deformed under the working conditions and are torn or punctured becoming unable to function. In some implementations, o-rings are assembled between the connection ducts that move relative to each other to provide flexibility and leak-proofing, however, the o-rings are insufficient in attenuating the vibrations in this type of connections and are worn away in the course of time due to friction.
In the United States Patent no. US4160625 , a direct suction system implemented in the hermetic compressors is described. In this system the suction port of the cylinder head is directly connected to the compressor inlet by way of a connecting pipe, and the refrigerant is aimed to be delivered to the cylinder without being heated. This connecting pipe situated between the pipe extending from the suction port of the cylinder head and the pipe forming the compressor inlet, attenuates the movement of the compressor unit by means of the o-rings and radial cavities at each end forming articulated joints with the other metallic fittings.
In the United States Patent no. US5803717 , a direct suction system is explicated which is formed of a flange arranged with a certain angle to the suction connector at the inlet of the suction muffler, a telescopic tube having a leading end being in full contact with this flange and a helical spring for restraining the telescopic tube. The pressure inside the housing is balanced by means of the gap left in between the compressor suction channel and the telescope tube fitted into the compressor channel.
In the United States Patent no. US6155800 , a description is given of a direct suction system wherein the suction muffler is outside of the hermetic shell and the gas from the muffler is delivered to the suction chamber by way of a flexible connection tube that can compress and extend like a bellows.
In the United States Patent no. US4793775 representing the closest prior art with respect to claim 1, a direct suction system is described that is formed by a bellows-like connector duct in between the compressor suction inlet pipe and the muffler inlet. After one end of the connector duct is fitted into the muffler inlet which is in form of a stopper, the other end is pressed into resilient engagement with the inner surface of the casing wall facing the compressor suction inlet pipe. In the case of oil accumulation in the connector duct, the end that bears on the casing is bended downwards to allow the oil to drain into the casing again.
In the United States Patent no. US6390788 , a description is given of a direct suction system which is formed by a coupling cap that connects a suction muffler to a compressor suction pipe the one at the top being inserted into the muffler having an elastic member to hold it in place and the bottom one having a limiting surface for firmly setting the coupling cap on the suction muffler. A helical spring arranged between the coupling cap and the compressor suction pipe provides for direct suction and pressure equalization, and attenuates the motor vibrations.
The aim of the present invention according to claim 1 is the realization of a compressor utilized in the cooling devices comprising a connection mechanism that provides to deliver the refrigerant fluid to the suction muffler and prevents the transmittance of the motor vibrations to the casing.
The compressor realized in order to attain the aim of the present invention is explicated in the claims.
In the compressor of the present invention, the compressor inlet pipe extending into the casing from the outside which provides the entrance of the refrigerant fluid returning from the refrigerant cycle, is connected to the suction pipe that is connected to the suction muffler or the cylinder head by means of a connection mechanism and the vibration of the suction pipe resulting from the operation of the parts such as the motor, piston, cylinder etc. is attenuated within this connection mechanism. The connection mechanism allows some amount of the refrigerant fluid to enter into the casing providing the balancing of the pressure within the casing.
The connection mechanism comprises a flexible, disc shaped attenuating element and the vibrations in both the radial and axial directions are attenuated by means of the spring section disposed within the shell structure of the attenuating element.
The connection configuration of the attenuating element to the compressor inlet pipe and the suction pipe prevents the low amplitude vibrations to be transmitted to the casing and the noise level of the compressor is reduced.
The compressor realized in order to attain the aim of the present invention is shown in the attached figures, where:
Figure 1 - is the sectional view of a compressor.
Figure 2 - is the sectional view of a suction pipe.
Figure 3 - is the sectional view of a compressor inlet pipe.
Figure 4 - is the perspective view of a damper.
Figure 5 - is the A-A sectional view of a damper.
Figure 6 - is the perspective view of a compressor inlet pipe.
Figure 7 - is the perspective view of a compressor inlet pipe, a suction pipe and a connection mechanism.
Figure 8 - is the schematic view of a connection mechanism.
Figure 9 - is the schematic view of detail D of a connection mechanism.
Elements shown in figures are numbered as follows:
1. Compressor
2. Casing
3. Cylinder
4. Cylinder head
5. Suction muffler
6. Compressor inlet pipe
7. Suction pipe
8. Connection mechanism
9. Hole
10. Damper
11. Spring section
12. Interior housing channel
13. , 113. Retainer
14. Exterior housing channel
The compressor (1) comprises a casing (2) that guards the movable components within, a cylinder (3) providing the suction and pumping of the circulation fluid, a cylinder head (4) situated on the cylinder (3), directing the sucked and pumped circulation fluid, a suction muffler (5) that attenuates the noise resulting from the circulation fluid, a compressor inlet pipe (6) that extends from outside the casing (2) to the interior providing the entrance of the circulation fluid delivered from the evaporator, a suction pipe (7) allowing the entrance of the circulation fluid to the suction muffler (5) or directly to the cylinder head (4) and a connection mechanism (8) that connects the compressor inlet pipe (6) with the suction pipe (7), attenuating the vibrations of the movable components of the compressor (1) in the radial and axial directions, and providing the balancing of pressure within the interior of the casing (2) by allowing the passage of the refrigerant fluid into the casing (2).
The connection mechanism (8) comprises a damper (10) of elastic material having a disc shaped structure, with a hole in the middle allowing it to be attached to the compressor inlet pipe (6), situated between the suction pipe (7) and the compressor inlet pipe (6) that move relative to one another during the operation of the compressor (1), fitted on the exterior surface of the compressor inlet pipe (6) and surrounded by the inner surface of the suction pipe (7), attenuating the radial and axial vibrations of the suction pipe (7) that move together with the movable components such as the motor, piston etc.
The damper (10) comprises a spring section (11) formed of a U or V shaped circular protrusion having a diameter smaller than its exterior diameter and larger than that of the hole (9) positioned on one surface of its shell and a U or V shaped circular recess aligned with the protrusion, on the rear surface of its shell.
The spring section (11) enables the damper (10) to stretch more in the radial and axial directions, increasing its capacity in attenuating particularly the high amplitude vibrations.
The connection mechanism (8) comprises an interior housing channel (12), situated on the compressor suction pipe (7), shaped as a ring, surrounding the exterior surface of the compressor inlet pipe (6), providing the damper (10) to be housed by clasping the hole (9) from its inner walls, and more than one ring shaped retainers (13) that bound the inner housing channel (12) from the sides and contacts the damper (10).
The connection mechanism (8) furthermore comprises a ring shaped exterior housing channel (14) positioned on the compressor inlet pipe (6), having a ring shape, said interior housing channel (12) surrounding the inner surface of the suction pipe (7), with a larger diameter than the outer diameter of the damper (10) and having a gap (B) between the outer side of the damper (10), allowing the passage of the circulation fluid through this gap (B) and allowing the suction pipe (7) to move freely within a certain distance without stretching the damper (10), preventing the transmission of low amplitude vibrations to the casing (2) and providing to reduce the noise level and more than one ring shaped retainers (113) that bound the exterior housing channel (14) from the sides, and provides to stretch the suction pipe (7) in the axial direction by bearing on the damper (10) during its high amplitude vibrations.
The retainers (13, 113) can be produced separately or as single piece with the compressor inlet pipe (6) and/or the suction pipe (7). The interior and exterior housing channels (12, 14) are formed by way of the retainers (13,113) in a simple way, housing the damper (10) by clasping from the hole (9) and housing from the outer side with a gap (B).
While the connection mechanism (8) is being assembled, the damper (10) is fitted on the interior housing channel (12) that is between the retainers (13) on the compressor inlet pipe (6) such that the walls of the hole (9) firmly clasps the interior housing channel (12) and then the outer side of the damper (10) is positioned between the retainers (13) on the suction pipe (7). For ease of assembly, the end of the suction pipe (7) extending to the connection mechanism (8) is made up of two separable top and bottom parts (Figure 7). After the damper (10) is assembled on the exterior housing channel (14) that is on the bottom part of the suction pipe (7), then the top part of the suction pipe (7) is fitted on the bottom part, completing the assembly of the connection mechanism (8). After the assembly, a structure is formed wherein the walls of the hole (9) of the damper (10) are clasped by the interior housing channel (12) and there is a gap (B) between the outer side of the damper (10) and the exterior housing channel (14).
The damper (10) attenuates the vibrations of the suction pipe (7) in the axial direction by means of its disc shaped shell and the interior and exterior housing channels (12, 14) that house firmly from the interior and with a gap (B) from the outside, and the spring section (11) increases the attenuating capacity in the axial direction, also providing the attenuation of vibrational movements in the radial direction. The gap (B) between the exterior housing channel (14) of the damper (10) allows some amount of the circulation fluid to pass into the casing (2) to provide the balancing of pressure and the easy start-up of the compressor (1). The gap (B) also provides the suction pipe (7) to move freely within a certain distance in low amplitude vibrations without stretching the damper (10) and the noise level is reduced by preventing the transmittance of the low amplitude vibrations to the casing (2).

Claims

A compressor (1) comprising a casing (2) that protects the movable components within, a suction muffler (5) that attenuates the noise resulting from the circulation fluid, a compressor inlet pipe (6) that extends from outside the casing (2) to the interior providing the entrance of the circulation fluid, and a suction pipe (7) allowing the entrance of the circulation fluid to the suction muffler (5) and whereby a connection mechanism (8) having a damper (10) that
- is situated between the suction pipe (7) and the compressor inlet pipe (6) that move relative to one another during functioning,

- attenuates the vibrations of the suction pipe (7) in the radial and axial directions,
characterised in that said damper
- is attached to the exterior surface of the compressor inlet pipe (6),

- is surrounded by the inner surface of the suction pipe (7),

- has a hole (9) in the middle allowing it to be fitted on the compressor inlet pipe (6),

- is made of an elastic material having a disc shaped structure,

- has a spring section (11) positioned on one of the damper (10) surfaces and formed of a U or V shaped circular protrusion having a diameter smaller than said spring section (11) exterior diameter and larger than that of the hole (9) and a U or V shaped circular recess aligned with the protrusion on said spring section (11) rear surface.
A compressor (1) as in Claim 1, characterized by the connection mechanism (8) comprising an interior housing channel (12), situated on the compressor suction pipe (7), providing to firmly house the damper (10) from the interior and an exterior housing channel (14) positioned on the compressor inlet pipe (6), providing to house the damper (10) from the outside with a gap (B).
A compressor (1) as in Claim 2, characterized by the connection mechanism (8) comprising a ring shaped exterior housing channel (14), surrounding the inner surface of the suction pipe (7), with a larger diameter than the outer diameter of the damper (10) and having the gap (B) between the damper (10) and itself, allowing the passage of the circulation fluid from this gap (B) and allowing the suction pipe (7) to move freely within a certain distance without stretching the damper (10), preventing the transmission of low amplitude vibrations to the casing (2) and more than one ring shaped retainers (113) that bound the exterior housing channel (14) from the sides, and providing to stretch the suction pipe (7) in the axial direction by bearing on the damper (10) during its vibration movements.
A compressor (1) as in Claim 3, characterized by the connection mechanism (8) comprising the interior housing channel (12), shaped like a ring, surrounding the exterior surface of the compressor inlet pipe (6), providing the damper (10) to be housed by clasping the hole (9) from its inner walls, and more than one ring shaped retainers (13) that bound the inner housing channel (12) from the sides and contacts the damper (10).