Pumps – Motor driven – Electric or magnetic motor
Patent
1997-03-27
2000-03-14
Freay, Charles G.
Pumps
Motor driven
Electric or magnetic motor
230173, F04B 3500
Patent
active
060364548
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is directed to a motor-driven compressor comprises a drive shaft driven by an electric actuator and acting on a crank mechanism having a crank to which a connecting rod is eccentrically connected and the connecting rod is connected to a piston movable in a corresponding cylinder.
With particular reference to the field of refrigerators, a motor-driven compressor used in a domestic appliance of this type has a cylinder in which the respective piston moves, and which has a longitudinal axis generally perpendicular to the axis of the drive shaft. The latter is generally perpendicular to a surface supporting the refrigerator. The axis of the cylinder, in particular, lies in a plane containing the longitudinal axis of the connecting rod at each point of the stroke of the piston in the cylinder, the plane being parallel to that in which the crank lies.
This solution consequently involves a fairly large vertical dimension of the motor-driven compressor. As a result of this and in order not to have very hulky motor-driven compressors, the dimensions of the cylinder have to be kept within limited values. It is therefore impossible to increase the displacement of the motor-driven compressor beyond certain values, clearly involving problems which also adversely affect the flowrate per unit time of the coolant fluid circulating in the refrigerator circuit.
Moreover, known solutions require the various parts of the crank mechanism and the drive shaft to be formed with considerable precision in order to achieve the required perpendicularity between the longitudinal axis of the cylinder and the drive shaft. This is to prevent any jamming of the piston in the cylinder and of the connecting rod on the eccentric pin, which would clearly involve problems in the use of the compressor.
SUMMARY OF THE INVENTION
An object of the present invention is to produce a motor-driven compressor which does not have the disadvantages of known motor-driven compressors mentioned above.
A particular object of the invention is to produce a motor-driven compressor with reduced vertical dimensions to permit better positioning thereof, particularly in refrigerators.
Another object is to offer a range of motor-driven compressors of the type mentioned, having a plurality of displacements so as to permit greater versatility in use.
Yet another object is to offer a motor-driven compressor of the type mentioned which is easy to produce, reliable and of low cost.
A further object is to offer a range of motor-driven compressors of the type mentioned, having pistons which can move at variable speeds during the intake and compression stages in order to improve the thermodynamic performance of the compressors.
These and other objects which will become clear to an expert in the art are achieved by means of a motor-driven compressor according to the characterizing part of the main claim.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be understood better from a reading of the description which follows with reference to the single appended drawing, given by way of non-limiting example and showing a cross-section of a motor-driven compressor according to a preferred embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
With reference to the drawing, a motor-driven compressor, indicated 1, comprises a casing 2 defined by two half-shells 3 and 4 coupled in any known manner. An electric motor 8 disposed in a cavity 5 defined by the casing 2 comprises a conventional stator 9 and a rotor 10. The motor is oblong and is supported, in any known manner, on spring shock-absorbers 11 (only one of which is visible in the drawing) which in turn are associated with a wall 12 of the half-shell 3.
The stator 9 is supported by a conventional support member disposed laterally on the motor 8 and carried in turn by an element 7 of known type fixed to the casing 2 in any known manner. The member 6 is drilled at 6A and supports a ball bearing 6B keyed to an output shaft (or drive shaft) 13 which is hollow
REFERENCES:
patent: 4718830 (1988-01-01), Middleton et al.
Bianchi Vittorio
Dietmar Lilie
Giraudo Roberto
Gurubatham Vincent
Todescat Marcio L.
Embraco Europe S.r.l.
Evora Robert Z.
Freay Charles G.
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