Pumps – Motor driven – Electric or magnetic motor
Patent
1996-11-05
1999-12-21
Thorpe, Timothy S.
Pumps
Motor driven
Electric or magnetic motor
F04B 1700
Patent
active
060041153
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention refers to a hermetic compressor to be used in refrigeration systems, such as refrigerators, freezers, air conditioners and others which require high pressure pumping.
BACKGROUND OF THE INVENTION
Those compressors commonly used in refrigeration systems of refrigerators in general and in air conditioners should meet some requirements such as reliability, low noise and vibration levels, high energetic yield, small dimensions and low cost. Conventional models on the market only partially meet these requirements.
The pumping of the refrigerant fluid in conventional compressors (of the reciprocating, rotary or centrifugal types, for example) is achieved by the relative movement between some components of these compressors, requiring constant and efficient lubrication for reducing friction and wear between the contacting parts of these components. Although the presence of oil reduces friction and wear in the compressors, it does have some drawbacks, such as the possibility of infiltration in the refrigeration system, the lubricant oil mixing with the refrigerant liquid. The circulation of oil in the refrigeration cycle reduces the efficiency of the system, increasing its energetic consumption. So that the infiltration of oil in the refrigeration system does not contaminate the refrigerant fluid, there should be compatibility between the fluids, which restricts the range of choices of said fluids.
Another drawback of the conventional compressors refers to their energetic consumption to operate the relative movement cited above. A large percentage of energy of said compressors is spent overcoming mechanical friction and inertia and not in pumping the refrigerant gas, thereby limiting the compressor yield and compromising its efficiency. Moreover, the parts with relative movement are continually submitted to mechanical fatigue and wear, requiring more resistant parts, which are consequently more expensive and increase the compressor costs. It has also been observed that the more movable parts a compressor has, higher will be its energetic consumption and costs.
To overcome the above cited problems, solutions have been developed for the pumping system, by pressurizing the refrigerant fluid by thermal variation, stimulating said refrigerant fluid or by the application of sound waves (U.S. Pat. No. 5,020,977, U.S. Pat. No. 5,167,124 and U.S. Pat. No. 5,174,130).
Although other solutions for pumping are known in the state of the art, such as by crystal piezoelectric action (U.S. Pat. No. 5,271,724), such solutions are not applicable to refrigeration systems in general.
DISCLOSURE OF THE INVENTION
Thus, the generic object of the present invention is to provide a compressor for refrigeration systems, especially refrigerators and air conditioners, which uses, at least in its system for pumping the refrigerant fluid to the refrigeration circuit, a smaller quantity of mechanical components presenting relative movement, in order to decrease vibrations and noise.
Another object of the present invention is to provide a compressor such as that mentioned above and which presents a high operational yield with low energetic consumption.
Another object of the present invention is to provide a compressor with the above cited advantages, having small dimensions and reduced costs.
These and other objectives are reached by means of a hermetic compressor for a refrigeration system of the type comprising a hermetic shell presenting an end gas inlet and an opposite end gas outlet; a plurality of pistons arranged inside the hermetic shell according to at least a sequential alignment and constructed of piezoelectric material, said pistons occupying, when in a first energizing condition, all of the corresponding internal volume of the hermetic shell in the assembly region of the pistons, each piston contracting longitudinally, from a same first lateral wall of the hermetic shell to a suction condition, when in a second energizing condition, so as to have one of its end faces distanced from t
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Empresa Brasileira de Compressores S/A - Embraco
Gartenberg Ehud
Thorpe Timothy S.
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