Pumps – Three or more cylinders arranged in parallel – radial – or...
Patent
1995-01-17
1997-10-07
Thorpe, Timothy
Pumps
Three or more cylinders arranged in parallel, radial, or...
91499, 417540, F04B 112
Patent
active
056740549
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a reciprocating type compressor in which suction, compression and discharge of a refrigerant are implemented by the reciprocation of pistons. More particularly, it relates to a reciprocating type compressor, suitable for use in a climate control system, which can compress a refrigerant gas.
2. Prior Art
Wobble-plate type and swash-plate type compressors, in which reciprocating pistons slidably is fitted in a plurality of respective cylinder bores formed in a cylinder block are reciprocated at different respective phases via a swash plate, are generally known and are, frequently applied to automotive climate control systems.
A pulsation of the discharge pressure has been a problem in the compressor of this kind. When the compressor is incorporated into an automotive climate control system, the pulsation of the discharge pressure propagates through a gas-conduit to a condenser, causing the condenser and the associated conduit to vibrate and, consequently, noise is generated inside the vehicle.
Generally, the pulsating discharge pressure that propagates from the discharge chamber of the compressor to the gas-conduit has a direct component that propagates from the cylinder bores directly to the conduit, and complex indirect components, in a wide frequency band, that is generated in the discharge chamber owing to the shape etc. of the discharge chamber. The direct component of the pulsating discharge pressure produced in the cylinder bore nearer to the gas-conduit generates greater noise. The frame of the vehicle resonates to the indirect components of the vehicle and amplifies the noise when the natural frequency of the frame or the like of the vehicle falls in the frequency band of the indirect component.
In the conventional automotive climate control system, a muffler is provided in a gas-conduit connecting the discharge chamber of the compressor to the condenser so as to suppress the generation of noise attributable to vibration of the condenser.
Nevertheless, any muffler provided in the gas-conduit requires additional space for mounting the muffler in the vehicle, and it has become difficult to install the muffler in the engine compartment of recent vehicles in which parts are densely arranged.
Since the pulsating discharge pressure is inversely proportional to the volume of the discharge chamber, the muffler may be omitted after increasing the volume of the discharge chamber relative to the volume of the cylinder bores. However, an expansion of the discharge chamber entails an increase in the size of the compressor, which, like the placement of the muffler in the gas-conduit, causes a problem regarding available space.
Even if the volume of each discharge chamber of a compressor is increased so as to suppress the discharge pressure pulsation, the direct component that propagates directly from the cylinder bores of the compressor to the gas-conduit and, particularly, the pulsation attributable to the cylinder bores near the conduit, cannot be appreciably reduced and propagates to the gas-conduit, the equipment in a vehicle then resonates due to the indirect component when the respective natural vibration frequencies of the equipment coincide with the frequency of the indirect component of the discharge pulsation and, therefore, the noise that prevails in the passenger compartment cannot be effectively reduced.
The suction pressure pulsation in the suction chamber of a compressor, similarly to the discharge pressure pulsation, also propagates through the gas-conduit to the evaporator and causes similar noise problems.
It is known that the resonant frequency of the evaporator of an automotive climate control system is in the range of 500 to 1000 Hz. Accordingly, a muffler has been arranged for reducing the suction pressure pulsation of a frequency in the range of 500 to 1000 Hz in the conduit connecting the evaporator to the suction chamber of a compressor.
Nevertheless, the muffler requires an additional space in the veh
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Hibino Sokichi
Kobayashi Hisakazu
Makino Yasunori
Ota Masaki
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Korytnyk Peter G.
Thorpe Timothy
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