Compressor having discharge pulsation reducing structure

Pumps – With muffler acting on pump fluid

Reexamination Certificate

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Reexamination Certificate

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06572345

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a reciprocating type compressor and more particularly, to a compressor having a discharge pulsation reducing structure for reducing pulsation when discharging refrigerant.
2. Description of the Prior Art
Generally, compressors are widely used for compressing refrigerant in refrigerating apparatus, such as refrigerators.
As shown in
FIG. 1
, general reciprocating type compressors comprise a casing
10
having an upper shell
11
and a lower shell
12
, a compressing part composed of components, which are placed at a lower part of inside of the case
10
for compressing refrigerant, and a motoring part
20
for driving the compressing part.
The motoring part includes a stator
21
, a rotator
22
that is rotated by the electronic interaction with the stator
21
, and a crankshaft
23
press-fit in the center of the rotator
22
.
The compressing part includes a cylinder block
30
installed at the lower part of the inside of the case
10
, a connecting rod
40
eccentrically connected to a lower part of the crankshaft
23
, a piston
50
connected to a front end of the connecting rod
40
, reciprocating linearly inside of a compressive chamber
31
formed in the cylinder block
30
, and a cylinder head
60
disposed at the front (
32
; refer to
FIG. 2
) of the cylinder block
30
to seal the compressive chamber
31
. In the cylinder head
60
, a refrigerant suction chamber
61
and a refrigerant discharge chamber
62
are separately formed up and down respectively. A valve assembly
70
is installed between the cylinder head
60
and the front
32
of the cylinder block
30
. The valve assembly
70
controls flow of the refrigerant in the refrigerant suction chamber
61
, the refrigerant discharge chamber
62
, and the compressive chamber
31
.
Meanwhile, a suction muffler
80
connected to the refrigerant suction chamber
61
is disposed at an upper of the cylinder head
60
. A refrigerant suction pipe
81
that draws refrigerant from an evaporator (not shown) is connected to the suction muffler
80
.
As shown in
FIGS. 2 and 3
, a discharge muffler
33
protrudes from the bottom of the cylinder block
30
, and the discharge muffler
33
is sealed by a muffler cover
34
. A refrigerant discharge pipe
35
, a channel for supplying refrigerant to a condenser (not shown), is connected to the muffler cover
34
. A refrigerant discharge hole
32
a
is formed in the front
32
of the cylinder block
30
, and the refrigerant discharge hole
32
a
is connected to the discharge muffler
33
by a refrigerant passage
37
.
On the other hand, the valve assembly
70
comprises a suction valve plate
71
having a suction valve
71
a
formed thereon, and a discharge valve plate
72
having a discharge valve
72
a
formed thereon. The suction valve
71
a
controls flow of refrigerant between the compressive chamber
31
and the refrigerant suction chamber
61
of the cylinder head
60
. The discharge valve
72
a
controls flow of refrigerant between the compressive chamber
31
and the refrigerant discharge chamber
62
of the cylinder head
60
.
In the above construction, a process of discharge of refrigerant drawn into the compressor after being compressed by the piston
50
is as follows.
Firstly, if the piston
50
retreats to a bottom dead point (to the left direction in
FIG. 1
) inside of the compressive chamber
31
by rotation of the crankshaft
23
, refrigerant of low temperature and low pressure is drawn from an evaporator into the suction pipe
81
. The refrigerant is drawn into the compressive chamber
31
after passing the suction muffler
80
and the refrigerant suction chamber
61
of the cylinder head
60
, sequentially. Then, as the piston
50
progresses to a top dead point (to the right direction in
FIG. 1
) in the compressive chamber
31
rotation of the crankshaft
23
, refrigerant is compressed to high temperature and high pressure by the refrigerant. Such compressed refrigerant is drawn into the discharge muffler
33
via the refrigerant discharge hole
32
a
of the front plate
32
of the cylinder block
30
and the refrigerant passage
37
, after staying in the refrigerant discharge chamber
62
of the cylinder head
60
for a determined time. After that, the high temperature and high pressure refrigerant is discharged to a condenser (not shown) via the refrigerant discharge pipe
35
connected to the muffler cover
34
.
However, the reciprocating compressor as described above has a problem of generating discharge pulsation since refrigerant cannot be discharged consecutively because the piston
50
discharges refrigerant after drawing and compressing by doing reciprocal action in the compressive chamber
31
. This discharge pulsation of refrigerant becomes a main reason of vibration and noise of the compressor. Especially, the noise of the compressor that is generated in low frequency band about 120 Hz~500 Hz of natural frequency of other components of a refrigerating apparatus increases the noise of the entire refrigerating apparatus and vibration due to resonance with other components of the refrigerating apparatus.
Increasing the flow resistance of the discharged refrigerant can reduce this kind of discharge pulsation of refrigerant. In other words, discharge pulsation of refrigerant would be reduced by decreasing the cross-sectional area of the refrigerant passage
37
between the discharge muffler
33
and the refrigerant discharge chamber
62
of the cylinder head
60
or by lengthening the length of the refrigerant passage
37
. Yet, if the cross-sectional area of the refrigerant passage
37
becomes too small, the efficiency of the compressor would be reduced since refrigerant cannot flow smoothly between the refrigerant discharge chamber
62
and the discharge muffler
33
. In addition, there is a limitation to the possible length of the refrigerant passage
37
, since the refrigerant passage
37
is passed through the cylinder block
30
.
SUMMARY OF THE INVENTION
The present invention has been made to overcome the above-mentioned problems of the related art. Accordingly, an object of the present invention is to provide a compressor that can reduce discharge pulsation without decreasing the compressing efficiency by improving refrigerant discharge structure.
The above object is accomplished by a compressor including a cylinder block having a refrigerant discharge chamber installed in a cylinder head; a first discharge muffler that is installed at a lower part of the cylinder block; a second discharge muffler installed at a lower part of the cylinder block and whereto a refrigerant discharge pipe is connected; a refrigerant passage having a greater cross-sectional area of refrigerant suction part than that of refrigerant discharge part, and the refrigerant passage connects the refrigerant discharge chamber and the first discharge muffler; a connector that connects the first discharge muffler and the second discharge muffler. Each of the cross-sectional diameter of the refrigerant suction part and an inner diameter of the connector has different sizes with predetermined proportions.
It is preferable that the cross-sectional diameter of the refrigerant suction part and the inner diameter of the connector have predetermined proportions to meet the following conditional expression.
[Conditional expression]
(&PHgr;
1
):(&PHgr;
2
)=2.0×6.4:1.78×2.6
Moreover, the relative proportion between the diameter (&PHgr;
1
) and the inner diameter (&PHgr;
2
) of the compressor is 6.4:1.78.
It is advisable that the relative proportion between the diameter (&PHgr;
1
) and the inner diameter (&PHgr;
2
) is 6.4:2.16.
It is also advisable that the relative proportion between the diameter (&PHgr;
1
) the inner diameter (&PHgr;
2
) is 6.0:1.78.
In addition, it is preferable that the proportion between the diameter (&PHgr;
1
) and the inner diameter (&PHgr;
2
) is 6.0:2.16.
In addition to the above proportions, it is preferable that the relative proportion between t

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