Pumps – With muffler acting on pump fluid
Reexamination Certificate
2001-09-04
2003-04-15
Freay, Charles G. (Department: 3746)
Pumps
With muffler acting on pump fluid
C417S415000, C181S212000, C181S403000
Reexamination Certificate
active
06547536
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a reciprocating compressor, and more particularly to a reciprocating compressor having a structure for reducing a pulsation that is generated during a refrigerant discharge.
2. Description of the Related Art
Generally, a reciprocating compressor is widely used in freezing appliances such as refrigerator, or the like, to compress refrigerant.
As shown in
FIG. 1
, the reciprocating compressor includes a casing
10
having an upper shell
11
and a lower shell
12
, a compressing device portion formed in a lower portion of the casing
10
and having components for compressing refrigerant, and an electric device portion
20
for driving the components of the compressing device portion.
The electric device portion
20
includes a stator
21
, a rotator
22
rotated by an electro-magnetic operation with the stator
21
, and a crank shaft
23
press-fitted in the center portion of the rotator
22
.
The compressing device portion includes a cylinder block
30
disposed in the lower portion of the casing
10
, a connecting rod
40
eccentrically connected to a lower end of the crank shaft
23
, a piston
50
connected to a leading end of the connecting rod
40
to linearly reciprocate within a compressing chamber
31
defined in the cylinder block
30
, and a cylinder head
60
disposed on a front side
32
(
FIG. 2
) of the cylinder block
30
for sealing the compressing chamber
31
. The cylinder head
60
(
FIG. 1
) has a refrigerant intake chamber
61
and a refrigerant discharge chamber
62
formed at upper and lower portion thereof, respectively. Between the cylinder head
60
and the front side
32
of the cylinder block
30
, a valve assembly
70
is disposed. The valve assembly
70
controls a flow rate of the refrigerant between the refrigerant intake chamber
61
and the compressing chamber
31
and also between the refrigerant discharge chamber
62
and the compressing chamber
31
.
Meanwhile, at an upper portion of the cylinder head
60
, an intake muffler
80
is disposed, intercommunicating with the refrigerant intake chamber
61
. The intake muffler
80
is connected to a refrigerant intake pipe
81
, through which the refrigerant is drawn from an evaporator (not shown).
As shown in
FIGS. 2 and 3
, a discharge muffler
33
protrudes from a lower surface of the cylinder block
30
, and a muffler cover
34
provides a cover for sealing the discharge muffler
33
. The muffler cover
34
is connected to a refrigerant discharge pipe
35
through which the refrigerant is fed to a condenser (not shown). On the front side
32
of the cylinder block
30
, a refrigerant discharge port
32
a
is formed, intercommunicating with the discharge muffler
33
through a refrigerant channel
37
.
Meanwhile, the valve assembly
70
includes an intake valve plate
71
having an intake valve
71
a
formed thereon, and a discharge valve plate
72
having a discharge valve
72
a
formed thereon. The intake valve
71
a
controls the flow rate of the refrigerant between the compressing chamber
31
and the refrigerant intake chamber
61
of the cylinder head
60
, while the discharge valve
72
a
controls the flow rate of the refrigerant between the compressing chamber
31
and the refrigerant discharge chamber
62
of the cylinder head
60
.
In the compressor constructed as above, the discharge of the refrigerant after being compressed by the piston is as follows:
First, the piston is retreated in the compressing chamber
31
by the rotation of the crank shaft
23
to a bottom dead center (to a left hand side of FIG.
1
), and low temperature and low pressure refrigerant is fed from the evaporator (not shown). The refrigerant sequentially passes through the intake muffler
80
and the refrigerant intake chamber
61
of the cylinder head
60
, and flows into the compressing chamber
31
. Next, by the rotation of the crank shaft
23
, the piston
50
is advanced in the compressing chamber
31
to a top dead center (right hand side of FIG.
1
), and accordingly the refrigerant is compressed to high temperature and high pressure refrigerant. The compressed refrigerant stays in the refrigerant discharge chamber
62
of the cylinder head
62
for a predetermined time, and flows to the discharge muffler
33
through the refrigerant discharge port
32
a
and the refrigerant channel
37
. Then, the high temperature and high pressure refrigerant is discharged to the condenser (not shown) through the refrigerant discharge pipe
35
that is connected to the muffler cover
34
.
In the above reciprocating compressor, however, since the refrigerant is drawn, compressed, and discharged by the reciprocating movement of the piston
50
in the compressing chamber
31
, the consistent discharge of the refrigerant can not be guaranteed. Accordingly, a discharge pulsation of the refrigerant occurs. The discharge pulsation of the refrigerant causes noise and vibration of the compressor. In particular, the noise produced in a frequency range of 120 Hz-500 Hz, which is a characteristic frequency of the components of the freezing appliance, causes resonance with the components, and increases the level of noise and vibration of the freezing appliance.
The discharge pulsation of the refrigerant can be reduced by increasing a streaming resistance of the discharged refrigerant. That is, by reducing a sectional area of the refrigerant channel
37
between the refrigerant discharge chamber
62
and the discharge chamber
33
, or by lengthening the refrigerant channel
37
, the discharge pulsation of the refrigerant can be reduced. However, making the cross-sectional area of the refrigerant channel
37
smaller hinders smooth refrigerant flow between the refrigerant discharge chamber
62
and the discharge muffler
33
. Accordingly, the compressing efficiency deteriorates. Further, since the refrigerant channel
37
is passed through the interior of the cylinder block
30
, the length of the refrigerant channel
37
is limited.
SUMMARY OF THE INVENTION
The present invention has been made to overcome the above-described problems of the related art, and accordingly, it is an object of the present invention to provide a reciprocating compressor having an improved refrigerant discharging structure, capable of reducing a discharge pulsation of refrigerant without dropping compressing efficiency of the refrigerant compressor.
The above object is accomplished by a reciprocating compressor according to the present invention, including a pair of discharge mufflers disposed on the lower portion of a cylinder block; a first and a second refrigerant channels interconnecting the pair of discharge mufflers and a refrigerant discharge chamber of a cylinder head; a pair of muffler covers for sealing the pair of discharge mufflers, respectively; a connecting pipe for connecting the pair of muffler covers with each other; and a refrigerant discharge pipe connected to one of the pair of muffler covers that is interconnected with the second refrigerant channel. The first and the second refrigerant channels have refrigerant inflow sides which are connected to the refrigerant discharge chamber and have a predetermined cross-sectional area, and refrigerant outflow sides which are connected to the pair of discharge mufflers and have a cross-sectional area smaller than the cross-sectional area of the refrigerant inflow sides. A discharge pulsation of refrigerant is reduced by varying a proportion between the cross-sectional areas of the refrigerant outflow side of the first refrigerant channel, the refrigerant outflow side of the second refrigerant channel, and the connecting pipe according to an exhaust air volume of the compressor, respectively.
In the reciprocating compressor having exhaust air volume of 3.0 cc, it is preferable that the relationship between a cross-sectional diameter of the refrigerant outflow side of the first refrigerant channel, the cross-sectional diameter of the refrigerant outflow side of the second refrigerant channel, and an inner dia
Belena John F
Freay Charles G.
Ladas & Parry
Samsung Kwangju Electronics., Ltd.
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