Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
2001-08-06
2003-02-04
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S057000, C418S188000
Reexamination Certificate
active
06514060
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a scroll compressor, and more particularly, it relates to a scroll compressor reducing pulsation caused when discharging a compressed high-pressure fluid.
BACKGROUND ART
As an example of a conventional scroll compressor, an in-shaft discharge type scroll compressor discharging compressed high-pressure refrigerant gas into a casing through a passage provided in a drive shaft driving the compressor is now described.
As shown in
FIG. 4
, a partition
125
separates a closed casing
101
into a suction chamber
123
and a discharge chamber
122
.
The suction chamber
123
is provided therein with a scroll compression mechanism
103
for sucking and compressing refrigerant gas.
The scroll compression mechanism
103
is formed by a fixed scroll
110
and a movable scroll
111
. Spiral fixed scroll teeth
110
b
project from an end plate
110
a
of the fixed scroll
110
. Spiral movable scroll teeth
111
b
project from an end plate
111
a
of the movable scroll
111
. The movable scroll teeth
111
b
fit with the fixed scroll teeth
110
b
thereby forming a compression chamber
114
.
A suction port
110
c
is provided on a side surface of the fixed scroll
110
for feeding low-pressure refrigerant gas received from a suction pipe
105
into the compression chamber
114
. A discharge port
111
c
is provided on a portion around the center of the end plate
111
a
of the movable scroll
111
for discharging the refrigerant gas compressed to a high-pressure state.
The discharge chamber
122
stores a motor
107
. The scroll compression mechanism
103
is driven through a crank part
130
provided on the upper end of a drive shaft
108
of the motor
107
. The drive shaft
108
is provided with a discharged gas passage
108
e
for guiding the refrigerant gas discharged from the discharge port
111
c
to a discharged gas outlet
108
f
provided on the lower end of the drive shaft
108
.
The suction pipe
105
for feeding the refrigerant gas into the scroll compression mechanism
103
is connected to a portion of the casing
101
closer to the suction chamber
123
. A discharge pipe
106
for discharging the high-pressure refrigerant gas from the casing
101
is connected to a portion of the casing
101
closer to the discharge chamber
122
.
Operation of the aforementioned scroll compressor is now described.
Rotation of the motor
107
is transmitted to the scroll compression mechanism
103
through the drive shaft
108
and the crank part
130
. Thus, the movable scroll
111
revolves with respect to the fixed scroll
110
. The compression chamber
114
formed by the movable scroll teeth
111
b
and the fixed scroll teeth
110
b
contractedly moves from the outer peripheral portion toward the central potion due to the revolution of the movable scroll
111
.
Thus, the low-pressure refrigerant gas fed from the suction pipe
105
into the compression chamber
114
through the suction port
110
c
is compressed to a high-pressure state and discharged from the discharge port
111
c
of the movable scroll
111
.
The high-pressure refrigerant gas discharged from the discharge port
111
c
passes through the discharged gas passage
108
e
provided on the drive shaft
108
and flows out into the discharge chamber
122
from the discharged gas outlet
108
f
. The high-pressure refrigerant gas flowing out into the discharge chamber
122
passes through a clearance between the motor
107
and the casing
101
or the like and is delivered from the casing
101
through the discharge pipe
106
.
However, the aforementioned scroll compressor has the following problems:
The compression chamber
114
formed by the movable scroll teeth
111
b
and the fixed scroll teeth
110
b
spirally moves from the outer peripheral portion toward the central portion following revolution of the movable scroll
111
. At this time, the refrigerant gas compressed in the compression chamber
114
is discharged from the discharge port
111
c
, whereafter the refrigerant gas compressed in a next compression chamber is discharged.
The scroll compression mechanism
103
intermittently performs such discharge along with revolution of the movable scroll
111
, and hence it follows that the discharged refrigerant gas pulsates. The pulsating refrigerant gas may vibrate the drive shaft
108
particularly when passing through the discharged gas passage
108
f.
Depending on operating conditions of the scroll compressor, further, the natural frequency of the drive shaft
108
may resonate with the vibration frequency of the pulsation to make noise.
DISCLOSURE OF INVENTION
The present invention has been proposed in order to solve the aforementioned problems, and an object thereof is to provide a scroll compressor suppressing vibration or noise by suppressing pulsation of discharged gas.
A scroll compressor according to the present invention comprises a first scroll, a second scroll, a discharge port, a pressure chamber and a port. The first scroll has a first spiral body projecting from an end plate. The second scroll has a second spiral body projecting from an end plate for fitting with the first spiral body and forming a compression chamber. The discharge port is provided on the end plate of one of the first and second scrolls. The pressure chamber is provided on the back surface of the other one of the first and second scrolls. The port is provided on the end plate of the other scroll to communicate with the pressure chamber.
This scroll compressor, suppressing pulsation of a fluid compressed in the compression chamber by introducing the fluid into the pressure chamber, can suppress vibration or noise following such pulsation.
Preferably, the pressure chamber is formed by the other scroll and a lid.
In this case, it is possible to prevent pulsation of the fluid flowing into the pressure chamber from directly influencing a casing of the scroll compressor.
Preferably, the scroll compressor further comprises a relief port provided on the end plate of the other scroll for guiding a fluid in the process of compression to the pressure chamber and a relief valve opening/closing the relief port.
In this case, the relief valve is open when the pressure of the fluid in the compression chamber in the process of compression exceeds the pressure in the pressure chamber for feeding the fluid from the compression chamber in the process of compression into the pressure chamber, so that the pressure of the compression chamber in the process of compression is not increased beyond the pressure in the pressure chamber but over-compression is suppressed while the difference between the pressure of the compression chamber immediately before communicating with the discharge port and a discharge pressure is reduced and pulsation of the discharged fluid can be more suppressed when the compression chamber communicates with the discharge port. The timing for feeding the fluid into the pressure chamber through the relief valve deviates from the timing for discharging the fluid from the discharge port, thereby leveling the pressure of the fluid and reducing pulsation thereof.
More preferably, the discharge port communicates with a passage provided in a drive shaft for driving the first scroll or the second scroll.
In this case, vibration of the drive shaft or the like can be effectively suppressed in the so-called in-shaft discharge type scroll compressor having a drive shaft formed with a passage for passing a fluid therethrough.
Preferably, the first scroll is a fixed scroll, the second scroll is a movable scroll, and the port is provided on the fixed scroll.
In this case, the pressure chamber and the port communicating with the pressure chamber are formed on the side of the fixed scroll, whereby the pressure chamber and the port can be more readily formed as compared with the case of forming the same on the side of the movable scroll.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present inve
Deguchi Ryohei
Ishiguro Suguru
Kajiwara Mikio
Nojima Nobuhiro
Shibamoto Yoshitaka
Burns Doane , Swecker, Mathis LLP
Daikin Industries Ltd.
Vrablik John J.
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