WO2008031679A1

WO2008031679A1 - A compressor

Info

Publication number: WO2008031679A1
Application number: PCT/EP2007/058357
Authority: WO
Inventors: Ergin Arslan; Kenan Atac; Cetin Aydintug; Faruk Bayraktar
Original assignee: Arcelik Anonim Sirketi
Priority date: 2006-09-14
Filing date: 2007-08-13
Publication date: 2008-03-20
Also published as: TR200900590T1

Abstract

The present invention relates to a compressor (1) wherein the noise generated by the refrigerant fluid is decreased by a suction muffler (2), and which comprises inside the suction muffler (2) resonator rooms (4) serving to dampen the vibration, flow pipes (8) through which the refrigerant fluid flows, and an acoustic tuning means (10) that intersects the flow pipe (8) for changing the cross-section area.

Description

A COMPRESSOR

[0001] The present invention relates to a compressor comprising a suction muffler that attenuates the noise generated by the circulating fluid during the refrigerant cycle.

[0002] The motion of the refrigerant fluid in the hermetic compressors used in the cooling devices, for example refrigerators, is a major source of noise. The sound energy resulting from motion of the refrigerant fluid during operation of the compressor is transmitted to the compressor casing and propagates outside as compressor noise. In compressors, suction mufflers are used for dampening the pressure oscillations and thereby decreasing the noise power level resulting from the operation of the piston in the cylinder making periodic compression-contraction movements and opening closing of the suction valve. Inside a suction muffler generally resonator chambers are provided having different volumetric resonance frequencies for decreasing the noise power level, refrigerant fluid tubes passing through the resonator chambers and openings for diffusion of the refrigerant fluid into the resonator rooms. During the flow of the refrigerant fluid flowing inside the suction muffler, noise can be generated and this noise can arise from the configuration of the flow tube.

[0003] In the United States of America patent document no. US6446454, a suction muffler for a compressor includes more than one chamber for temporary storage of the refrigerant, a resonator chamber for attenuating a noise of a specific frequency, and a vibration plate in one of the chambers. By means of the vibration plate, the pressure by a sudden increase in volume of the refrigerant fluid is decreased and the pulsating flows occurring by the piston and transmission of noise from a suction valve are prevented.

[0004] In the International patent application no. WO05066494, a suction muffler of a compressor comprises muffler chambers having different volumetric resonance frequencies to achieve acoustic attenuation at different frequencies, and the refrigerant fluid flows through a flow pipe passing through the chambers. In the suction muffler, furthermore attenuation conduits are provided having a different cross-sectional area at the ends which open to different muffler chambers between the resonator rooms that is used to bypass the acoustical energy and minimize the noise at the desired frequencies.

[0005] In the United States of America patent document no. US5821475, in suction muffler of a compressor venturi nozzles having gas inlet and outlet openings and a throat therebetween are provided and the total throat area can be changed by an adjustable collar.

[0006] The aim of the present invention is the realization of a compressor comprising a suction muffler that can adjust the noise level for different models and different capacities.

[0007] The compressor realized in order to attain the aim of the present invention is explicated in the claims.

[0008] In the compressor, a suction muffler is used for decreasing the noise generated by the refrigerant fluid and the refrigerant fluid flows through the flow pipes passing through the suction muffler. In the embodiment of the present invention, an acoustic tuning means is used that is disposed on the path of the refrigerant fluid flowing through the flow pipe such that the flow pipe is intersected, having tuning holes thereon having a size smaller than the cross-section area of the flow pipe. When the acoustic tuning means is moved, a narrowing down of the flow pipe cross-section area is maintained by means of the tuning hole that enters into the flow pipe and overlaps with the cross- sectional area.

[0009] Resistance is formed for the refrigerant flow by changing the cross-sectional area of the flow pipe and noise adjustment is made by overlapping the tuning hole with the most suitable cross-section area with the flow pipe cross section.

[0010] In an embodiment of the present invention, the area of the biggest tuning hole on the acoustic tuning means is the same as the flow pipe cross-sectional area and the area of the other tuning holes have smaller sizes than the flow pipe cross-section area.

[0011] In another embodiment of the present invention, the acoustic tuning means is configured as a plate that intersects the flow pipe and is moved during production to adjust the noise level.

[0012] In another embodiment of the present invention, the acoustic tuning means is moved vertically with respect to the flow pipe direction. During adjustment, the tuning holes of different sizes are passed through the flow pipe one after another and the noise is decreased by the most suitably sized tuning hole left in the flow pipe.

[0013] In another embodiment of the present invention, the acoustic tuning means is positioned next to the separator inside the muffler casing and also the acoustic tuning means is centered on the flow pipe by means of the guides disposed on the separator and sliding sideways is prevented.

[0014] In the production and testing phases of the compressor, while the noise level is adjusted by the acoustic tuning means in the suction muffler, the noise level is measured for different compressor models or for the same compressor operating at different capacities and for determining the most suitable tuning hole corresponding to the flow pipe cross-section and the acoustic tuning means is fixed to the suction muffler in the latest adjusted position by various methods. Consequently, the adjustment made during the production phase is provided not to change during usage.

[0015] The compressor realized in order to attain the aim of the present invention is illustrated in the attached figures, where:

[0016] Hgure 1 - is the cross-sectional view of a compressor.

[0017] Hgure 2 - is the schematic view of a suction muffler.

[0018] Hgure 3 - is the perspective view of a suction muffler.

[0019] Hgure 4 - is the schematic view of an acoustic tuning means and a separator.

[0020] The elements illustrated in the drawings are numbered as follows:

1. Compressor

2. Suction muffler

3. Casing

4. Resonator room

5. Separator

6. Inlet orifice

7. Outlet orifice

8. Flow pipe

9. Tuning hole

10. Acoustic tuning means

11. Guide

[0021] The compressor (1) comprises a suction muffler (2) that attenuates the noise generated by the refrigerant fluid passing therethrough.

[0022] The suction muffler (2) comprises a casing (3) forming the outer wall thereof and guarding the components within, one or more resonator rooms (4) disposed inside the casing (3) serving to dampen the vibration, one or more separators (5) that separate the resonator rooms (4) from each other, one or more flow pipes (8) wherein the refrigerant fluid flows, having an inlet orifice (6) allowing entrance of the refrigerant fluid returning from the refrigerant cycle into the suction muffler (2) and an outlet orifice (7) for discharge of the refrigerant fluid from the suction muffler (2) and having a certain cross-section area (A).

[0023] The suction muffler of the present invention (2) comprises

- at least one acoustic tuning means (10),

- having at least one tuning hole (9) smaller than the cross-section area (A) of the flow pipe (8) and

- the tuning hole (9) overlaps with the flow pipe (8) cross-section when moved, resulting in narrowing down of the flow pipe (8) cross-section area (A).

[0024] The cross-section area (A) of the flow pipe (8) can be changed by moving the acoustic tuning means (10) by means of the tuning holes (9) thereon, resistance to the refrigerant flow is formed and also this resistance can be regulated and noise level adjustment can be made by determining the tuning hole (9) corresponding to the minimum noise level.

[0025] In an embodiment of the present invention, the acoustic tuning means (10) is configured as a plate that intersects the flow pipe (8) and is moved during production to adjust the noise level.

[0026]

[0027] The acoustic tuning means (10) is preferably moved vertically with respect to the direction of the flow pipe (8). During adjustment, the tuning holes (9) of different sizes are passed through the flow pipe (8) one after another and the noise is decreased by the most suitably sized tuning hole (9) left in the flow pipe (8).

[0028] In another embodiment of the present invention, the area of largest tuning hole (9) on the acoustic tuning means (10) is equal to the cross-section area (A) of the flow pipe (8) and the areas of the other tuning holes (9) are of a smaller size than the cross- section area (A).

[0029] If narrowing of the flow pipe (8) cross-section area (A) is not required according to the noise measurement results, then the tuning hole (9) having an equal area to the cross-section area (A) is positioned inside the flow pipe (8).

[0030] If narrowing of the flow pipe (8) cross-section area (A) is required according to the noise measurement results, then the tuning hole (9) having a smaller size than the cross-section area (A) is positioned inside the flow pipe (8).

[0031] In an embodiment of the present invention, the acoustic tuning means (10) is positioned next to the separator (5) inside the casing (3). Thus buckling or bending of the acoustic tuning means (10) is prevented by supporting in the casing (3). In this embodiment, the suction muffler (2) furthermore comprises one or more guides (11) disposed on the separator (5) that prevents the acoustic tuning means (10) from sliding sideways by centering on the flow pipe (8).

[0032] In the production and testing phases of the compressor (1), while the noise level is adjusted by the acoustic tuning means (10) in the suction muffler (2), the noise level is measured for different compressor (1) models or for the same compressor (1) operating at different capacities, aiming to determine the most suitable cross-section areas and the acoustic tuning means (10) is fixed to the suction muffler (2) by various methods in the latest position by adjusting the most suitable tuning hole (9) and the cross-section area (A). Consequently, the adjustment made during the production phase is provided not to change during usage.

[0033] The acoustic tuning means (10) can be easily moved by means of a holder attached to the acoustic tuning means (10) and extending out of the casing (3) without having to reach inside the casing (3).

[0034] A resistance adjustable with respect to the flow and thus an acoustic filter is provided by narrowing down the cross-section of the flow pipe (8) by means of the tuning holes (9) disposed on the acoustic tuning means (10).

[0035] Besides the acoustic adjustment made in the suction muffler (2), the coefficient of performance of the compressor (1) is enhanced by regulating the flow of the refrigerant fluid.

[0036] The suction mufflers (2) comprising acoustic tuning means (10) can be used in different compressors (1) having different capacities.

Claims

[0001] A compressor (1) comprising a suction muffler (2) having a casing (3) forming the outer wall thereof and guarding the components within, one or more resonator rooms (4) disposed inside the casing (3) serving to dampen the vibration, one or more separators (5) that separate the resonator rooms (4) from each other, one or more flow pipes (7) with a certain cross-sectional area (A), having an inlet orifice (5) allowing entrance of the refrigerant fluid returning from the refrigerant cycle and an outlet orifice (6) for discharging the refrigerant fluid and characterized by a suction muffler (2) comprising an acoustic tuning means (10), having at least one tuning hole (9) smaller than the cross-section area (A) of the flow pipe (8) and the tuning hole (9), which overlaps with the flow pipe (8) cross-section, when moved, resulting in narrowing down of the flow pipe (8) cross-section area (A).

[0002] A compressor (1) as in Claim 1, characterized by the acoustic tuning means

(10) configured as a plate intersecting the flow pipe (8).

[0003] A compressor (1) as in Claim 1 or 2, characterized by the acoustic tuning means (10) that is moved vertically with respect to the direction of the flow pipe (8).

[0004] A compressor (1) as in any one of the above claims, characterized by the acoustic tuning means (10) wherein the area of largest tuning hole (9) thereon is equal to the cross-section area (A) of the flow pipe (8) and the areas of the other tuning holes (9) are of a smaller size than the cross-section area (A).

[0005] A compressor (1) as in any one of the above claims, characterized by the acoustic tuning means (10) that is positioned in the casing (3) next to the separator (5).

[0006] A compressor (1) as in Claim 5, characterized by one or more guides (11) disposed on the separator (5) that prevents the acoustic tuning means (10) from sliding sideways by centering on the flow pipe (8).

[0007] A compressor (1) as in any one of the above claims, characterized by the acoustic tuning means (10) comprising a handle that extends out of the casing (3).