Double-headed piston compressor

Details Double-headed piston compressor Double-headed piston compressor

2000-06-15

2002-06-11

Freay, Charles G. (Department: 3745)

Pumps

Three or more cylinders arranged in parallel, radial, or...

C417S312000, C417S540000

Reexamination Certificate

active

06402483

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a double-headed piston compressor for an air conditioner used in vehicles.
As shown in
FIG. 7
, a typical double-headed piston compressor includes front and rear cylinder blocks
101
,
102
, which are joined together. A front housing member
103
is attached to one end of the front cylinder block
101
. A rear housing member
104
is attached to the other end of the rear cylinder block
102
.
A drive shaft
105
is rotatably supported by the cylinder blocks
101
,
102
, and the front housing member
103
. Cylinder bores
106
are formed in the cylinder blocks
101
,
102
. The cylinder bores
106
formed in the front cylinder block
101
correspond to those in the rear cylinder block
102
. Double-headed pistons
107
are accommodated in the cylinder bores
106
and are connected the drive shaft
105
through a swash plate
108
. A suction chamber
109
and a discharge chamber
110
are formed in each of the front and rear housing members
103
,
104
.
Rotation of the drive shaft
105
is converted into reciprocation of the pistons
107
by the swash plate
108
. The pistons
107
draw refrigerant gas to the corresponding cylinder bores
106
, compress the gas, and discharge the gas to the discharge chambers
110
. Then, the compressed refrigerant gas is sent to an external refrigerant circuit.
Each piston
107
intermittently discharges refrigerant gas from the corresponding cylinder bore
106
. The intermittent discharge of compressed gas generates pressure pulsation, which causes vibration and noise in the external refrigerant circuit. Therefore, in the compressor of
FIG. 7
, a muffler chamber
118
is formed on the outer circumferential portions of the cylinder blocks
101
,
102
. Refrigerant gas that is discharged from the front and rear discharge chambers
110
flows to the muffler chamber
118
. The muffler chamber
118
attenuates the pressure pulsation of the refrigerant gas before sending the gas to the external refrigerant circuit.
In the past, attenuation of the pressure pulsation was accomplished by increasing the volume of the muffler chamber
118
, which increased the size of the compressor. However, there is a need to improve the attenuation of the pressure pulsation without increasing the size of the compressor.
SUMMARY OF THE INVENTION
An objective of the present invention is to provide a double head piston compressor that can attenuate pressure pulsation of discharged gas without increasing the size of the compressor.
To achieve the above objective, the present invention provides a compressor including a drive shaft and a drive plate, which is supported by the drive shaft. A piston is coupled to the drive plate. The piston includes two opposed piston heads, and the drive plate converts rotation of the drive shaft into reciprocation of the piston. A pair of compression chambers correspond to the piston heads. A pair of discharge chambers correspond to the compression chambers. Each compression chamber is connected to a corresponding one of the discharge chambers through a respective discharge port. The piston heads compress gas in the corresponding compression chambers and discharge compressed gas from the corresponding compression chambers to the corresponding discharge chambers. Each discharge chamber has an outlet for compressed gas. A limit wall is formed in each discharge chamber. Each limit wall limits the flow of compressed gas in the corresponding discharge chamber so that compressed gas in the corresponding discharge chamber flows circularly about the axis of the drive shaft in one direction from the discharge port toward the outlet.
Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.


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