Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2000-12-21
2002-03-12
Leung, Philip H. (Department: 3742)
Pumps
Motor driven
Electric or magnetic motor
C417S415000, C417S416000, C060S039440
Reexamination Certificate
active
06354818
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an oscillation-type compressor preferably used in a refrigerator and an air-conditioner.
Various conventional oscillation-type compressors are disclosed in Published Japanese Patent Applications Nos. Kokai 51-57009, Kokai 8-247025, Kokai 9-324764, and Kokai 4-347460.
The oscillation-type compressors basically comprise a movable element including a piston and a stationary element including a cylinder, so that gas is introduced into a compression chamber defined by the piston and the cylinder and compressed by the piston that reciprocates in the axial direction.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an oscillation-type compressor capable of minimizing the top clearance of the piston in a given piton stroke and maintaining efficient compressor operations.
Another object of the present invention is to realize a practical cooling device, such as a refrigerator, which is capable of automatically increasing the stroke of the piston in response to a high ambient air temperature so that the cooling power can be sufficiently obtained even in such a high load condition and is also capable of automatically reducing the stroke of the piston in response to a decreased ambient air temperature, thereby realizing efficient compressor operation in accordance with the driving conditions of the cooling device without using additional detecting and control devices.
Another object of the present invention is to provide an oscillation-type compressor capable of suppressing the top clearance of the piston even in the start-up operation where the piston is operated with short strokes, thereby realizing efficient compressor operation.
Another object of the present invention is to provide an oscillation-type compressor capable of stabilizing the cylinder position during an ordinary operation.
Another object of the present invention is to provide an oscillation-type compressor capable of optimizing the piston position with respect to the cylinder position irrespective of changed operating pressure conditions, thereby minimizing the top clearance and realizing efficient compressor operation.
Another object of the present invention is to provide an oscillation-type compressor capable of preventing the piston from colliding with the exhaust valve when the piston stroke is increased, thereby eliminating any damage and noise.
Another object of the present invention is to provide an oscillation-type compressor having an exhaust or intake pipe shiftable in the axial direction even when large vibration occurs in the axial direction, thereby reducing a large amplitude stress repetitively acting on the exhaust or intake pipe.
In order to accomplish the above and other related objects, one aspect of the present invention provides an oscillation-type compressor comprising a tightly closed casing having an inside space for storing coolant gas, a block accommodated in the tightly closed casing, a motor including a stator and a mover, a piston connected to the mover of the motor, a movable element including the mover of the motor and the piston, a stationary element including the stator of the motor and the block, an elastic element having a portion fixed to the movable element and another portion fixed to the stationary element, a cylinder shiftable in an axial direction with respect the block, and a shifting device for shifting the cylinder in the axial direction.
Another aspect of the present invention provides an oscillation-type compressor comprising a tightly closed casing having an inside space for storing coolant gas, a block accommodated in the tightly closed casing, a motor including a stator and a mover, a piston connected to the mover of the motor, a movable element including the mover of the motor and the piston, a stationary element including the stator of the motor and the block, an elastic element having one portion fixed to the movable element and another portion fixed to the stationary element, a cylinder shiftable with respect the block, a cylinder head fixed to the cylinder, back-pressure chambers formed in the coolant gas space and airtightly partitioned by an integral unit including at least one of the cylinder and the cylinder head, and at least one of the back-pressure chambers being held at a low pressure level and another one of the back-pressure chambers being held at a high pressure level.
It is preferable that this oscillation-type compressor further comprises an elastic member having one end connected to the integral unit including at least one of the cylinder and the cylinder head and the other end connected to the stationary element, and further comprises a cylinder position detecting sensor fixed to one of the stationary element and the cylinder.
Another aspect of the present invention provides an oscillation-type compressor, comprising a tightly closed casing having an inside space for storing coolant gas, a block accommodated in the tightly closed casing, a motor including a stator and a mover, a piston connected to the mover of the motor, a movable element including the mover of the motor and the piston, a stationary element including the stator of the motor and the block, an elastic element having one portion fixed to the movable element and another portion fixed to the stationary element, a cylinder fixed to the block or shiftable in an axial direction with respect the block, a cylinder head fixed to the cylinder, an auxiliary pipe having one end shiftable in the axial direction with respect to one of an exhaust pipe and an intake pipe and the other end fixed to one of the cylinder and the cylinder head.
Furthermore, another object of the present invention is to provided an oscillation-type compressor capable of causing the cylinder to shift toward the top dead center when the ambient temperature is high and therefore the required cooling power is high.
Another object of the present invention is to provide an oscillation-type compressor capable of surely reducing the pulsation of the compressor even when the discharged gas amount increases in response to an increased stroke, thereby suppressing noise and vibration.
Another object of the present invention is to provide an oscillation-type compressor capable of preventing the compressor efficiency from deteriorating due to the leakage of coolant gas.
Another object of the present invention is to provide an oscillation-type compressor capable of preventing the cylinder from shifting excessively toward the top dead center, while causing no problems in the reliability of the elastic element or the like.
In order to accomplish the above and other related objects, one aspect of the present invention provides an oscillation-type compressor comprising a block and a piston accommodated in a tightly closed casing, a motor including a stator and a mover, a movable element including the mover and the piston, a stationary element including the block and the stator, an elastic element having a portion fixed to the movable element and another portion fixed to the stationary element, a cylinder accommodating the piston so that the piston is shiftable in an axial direction, the cylinder being inserted in the block so as to reciprocate in the axial direction with a closed space formed between the block and the cylinder, a cylinder head comprising an exhaust chamber and attached to the cylinder, and a communication passage connecting the closed space and the exhaust chamber.
It is preferable that the above-described closed space is connected to an outside space via an exhaust pipe. And, a slide surface between the cylinder and the block is connected to a lower part of the closed space via a passage. A groove is provided on a slide surface of one of the cylinder and the block.
Furthermore, another object to the present invention is to provide an oscillation-type compressor capable of increasing the top clearance of the piston in response to a decreased ambient air temperature or a decreased load without deteriorating the operating efficiency of the compres
Inagaki Koh
Katayama Makoto
Kobayashi Masanori
Morita Ichiro
Leung Philip H.
Matsushita Refrigeration Company
Van Quang
Woo Louis
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