Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1998-09-29
1999-11-09
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181229, 181403, F01N 108
Patent
active
059795972
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an inlet silencer system for a refrigeration motor-compressor set.
DISCUSSION OF THE BACKGROUND
Refrigeration motor-compressor sets are well known devices generally having, within a hermetically sealed capsule, a motor driving a compressor. The motor-compressor set is connected in a tightly sealed manner to the refrigeration circuit and the compressor is therefore submerged in the refrigerant gas within the capsule.
The compression is generally of the alternating type and therefore has a piston that moves within a cylinder and is actuated by the motor. The refrigerant gas is sucked into the capsule, compressed in the cylinder and then sent back to the refrigeration circuit.
Motor-compressor sets radiate a non-negligible amount of acoustic energy firstly because of the mechanical vibrations generated and secondly because of the noise, especially the suction noise, generated by the flow of gas.
This acoustic energy is inconvenient, especially for household applications.
In known systems, it has been attempted to reduce the nuisance caused by this sound level through various devices that lessen the vibrations and through silencers that lessen the gas flow noises. These silencers may, for example, be formed by chambers into which the refrigerant gas flows at the inlet and the outlet of the compressor. These chambers have volumes and inlet and outlet conduit sections that are determined to obtain the greatest possible attenuation of the band of audible frequencies.
Thus, the U.S. Pat. No. 3,396,907 describes a system where one or more chambers are series-connected with the crank-case of the crankshaft/connecting-rod assembly, which is itself connected by a tube to the suction chamber of the compressor.
The British patent No. 1,043,888 for its part describes a back-flow silencer system for compressors. This silencer has two unequal chambers in series on the back-flow tube of the compressor, these chambers being obtained by means of sheets that are folded and joined by welding.
However, none of the approaches known to date enables satisfactory attenuation and, in particular, it can be seen that suction noises remain and are the source of noise at a level that is as yet far too high, especially in a frequency band around 500 Hz.
SUMMARY OF THE INVENTION
An object of the present invention therefore is an inlet silencer system that considerably improves the reduction of the suction noises in a motor-compressor set.
According to a first aspect of the invention, there is provided an inlet silencer system for motor-compressor sets of the type comprising, in a hermetically sealed capsule, a compressor comprising a body, within which there are positioned a cylinder containing a piston and at least one back-flow chamber, a motor for the driving of said piston and a cylinder head closing said cylinder frontally through a set of valves, said silencer system comprising at least one inlet silencer conveying the refrigerant gas to be compressed from within the capsule towards the cylinder head and comprising two chambers separated by a wall, an intake tube conveying the gas from within the capsule towards a first of said chambers, a coupling tube going through said wall to provide for the passage of the gas from the first chamber to the second chamber and a lead-in pipe connecting the second chamber to said cylinder head, said silencer system being characterised in that the ratio by volume between the two chambers is of the order of 1 and is determined to obtain a diminishing of acoustic energy in the region of a frequency of 500 Hz and in that the total volume of the two chambers is in the range of 7 to 11 times the cubic capacity of the compressor.
According to another aspect of the invention, said silencer system is also characterised in that it furthermore comprises an additional chamber serving as a resonator, parallel-connected on the suction path of the refrigerant gas.
Through these arrangements and other particular features that shall be described her
REFERENCES:
patent: 3396907 (1968-08-01), Valbjorn
patent: 4111278 (1978-09-01), Bergman
patent: 4370104 (1983-01-01), Nelson et al.
Dang Khanh
Tecumseh Europe S.A.
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