Head and silencer of a refrigeration compressor

Details Head and silencer of a refrigeration compressor Head and silencer of a refrigeration compressor

1999-05-26

2001-02-13

Walberg, Teresa (Department: 3742)

Pumps

With muffler acting on pump fluid

C181S403000, C417S902000, C062S296000

Reexamination Certificate

active

06186751

ABSTRACT:

DESCRIPTION
The present invention refers to a particular form of both the head and the suction conduit of the silencer through which the refrigerant gas flows inside a sealed casing that encloses an electric motor, as particularly used in refrigerating apparatuses for home and similar applications.
To the purpose of more effectively exemplifying the present invention, said silencer is assumed to operate in close association with the compressor and to be made of plastics moulded by the injection moulding or any other appropriate plastic moulding process, without this of course limiting the scope of the same invention to just such a kind of coupling and material.
The gas pressure oscillations inside positive displacement compressors, in particular those used in domestic refrigeration equipment, are critically important owing to the extent to which they affect both the efficiency of and the level of sound power radiated by the compressors themselves. In these compressors, it is the refrigerant gas that comes from the suction tube that enters inside the sealed casing of the compressor.
The body of the compressor has a suction tube provided inside the casing which is connected to the suction valve through a number of channels and cavities that enable the suction gas to be conveyed into the cylinder.
The basic mechanisms governing the gas motion dynamics and, more generally, the state of the art are described in the Italian patent application no. PN0014 filed by the same Applicant, to which reference should therefore be made for obvious reasons of conciseness and of which the present invention shall be intended as constituting an improvement.
To the purpose of reducing the noise emissions from the suction conduit, the practice is commonly known of mounting a silencer element at the inlet at which the gas enters the head of the compressor, said silencer practically constituting in this manner the terminal portion of the gas suction conduit.
In view of using the sound-deadening effect thereof to the greatest possible extent, such a silencer is usually applied directly on to the inflow mouth of the valve plate, with such a construction as to be able to get over the thickness of the head.
It therefore is quite obvious that the head must be given an appropriately deep recess to accomodate at least a part of the silencer, ie. the one that is applied on to the inflow mouth of the valve plate. Owing to constructive reasons, such a connection is carried out after the valve plate has been assembled on the compressor body, but before assembling the head.
Such a method, however, calls for a number of manual assembly operations to be performed, so that the automatic process used to assemble the whole compressor must necessarily be interrupted and, as a result, a much longer time is required for manufacturing the compressor owing to both said interruption of an automated process and the time required for assembling the silencer manually. This practically turns out to constitute a drawback that considerably affect the overall production efficiency.
From EP 0 195 496 it is shown an hermetic motor-compressor unit for a refrigeration circuit, where the suction or inlet plenum chamber (A) is made as a separate part (
27
) of a plastic material in order to reduce heat transfer from the cylinder head to the suction chamber (A).
In said document it is explained that the spring
31
is first mounted on part
27
through the protrusion
38
. Then the part
27
is inserted into the slot
24
.
However, the presence of the spring
31
, previously mounted on said part
27
, will make more difficult such insertion of part
27
.
But, even more, the unavoidable scratching of the gaskets, pressed by the previously mounted spring
31
, that have to be mounted between the openings
28
and the parts
30
, will certainly damage said gaskets, therefore compromising the hermetic sealing between said openings and ports.
It therefore would be desirable, and it actually is a main purpose of the present invention, to provide a compressor head and silencing apparatus with such a form and size as to enable the whole assembly of the compressor to be carried out without assembling the silencer, and the silencer to be then assembled only upon completion of the actual manufacturing process, ie. after also the compressor head has been assembled.
It is a further purpose of the present invention to provide such a head and such silencer so that they enable techniques and materials to be used which are simple, cost-effective and readily available in the art.


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patent: 5992170 (1999-11-01), Yap

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