Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2002-01-10
2004-06-08
Yu, Justine R. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S416000, C417S520000
Reexamination Certificate
active
06746217
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 that is capable of minimizing a loss of driving force, reducing noise occurrence, simplifying a structure and heightening a precision of assembly.
2. Description of the Background Art
In general, a refrigerating cycle unit is formed as a compressor, a condenser, expansion unit and evaporator, and the like, are sequentially connected by a connecting tube.
Among them, the compressor sucks and discharges a refrigerant gas. Depending on the method for compressing gas, there are various types of compressors including a rotary compressor, a reciprocating compressor and a scroll compressor, etc.
The compressor includes a closed container having an internal space, an electric mechanism part mounted in the closed container and generating a driving force, and a compression mechanism part compressing gas upon receiving the driving force of the electric mechanism part.
As shown in
FIG. 1
, in the rotary compressor, as a rotor
2
of the electric mechanism part (M) mounted in the closed container
1
is rotated, a rotational shaft
3
press-fit in the rotor
2
is rotated.
According to the rotation of the rotational shaft
3
, in a state that a rolling piston
5
inserted in an eccentric portion
3
a
of the rotational shaft
3
positioned in the compression space (P) of the cylinder
4
is linearly in contact with a vane which is inserted at the inner circumferential surface of a compression space (P) of the cylinder
4
and one side of a cylinder
4
, dividing the compression space (P) into a high pressure portion and a low pressure portion, the rolling piston
5
is rotated inside the compression space (P) of the cylinder
4
.
In the rotation process, a series of processes in which the refrigerant gas is introduced into a suction hole
4
a
formed at one side of the cylinder
4
, compressed in the compression space (P) and discharged through a discharge hole
4
b
positioned at one side of the compressor are repeatedly performed.
With reference to
FIG. 2
, in the reciprocating compressor, a rotor
12
of the electric mechanism part (M) mounted in the closed container
11
is rotated, a crank shaft
13
press-fit in the rotor
12
is rotated. As the crank shaft
13
is rotated, a piston
14
coupled to an eccentric portion
13
a
of the crank shaft
13
is linearly moved in the compression space (P) of the cylinder
14
, compressing refrigerant gas sucked through a valve assembly
16
coupled to the cylinder
15
, and at the same time, discharging the gas through the valve assembly
16
, and this process is repeatedly performed.
With reference to
FIG. 3
, in the scroll compressor, as a rotor
22
of an electric mechanism part (M) mounted in a closed container
21
is rotated, a rotational shaft
23
provided with an eccentric part
23
a
press-fit at the rotor
22
is rotated.
According to the rotation of the rotational shaft
23
, a revolving scroll
24
coupled to the eccentric portion
23
a
of the rotational shaft
23
is engaged with a fixed scroll
25
and makes a revolving movement, according to which a plurality of compression pockets formed by wraps
24
a
and
25
a
in an involute curve form respectively formed at the revolving scroll
24
and the fixed scroll
25
are made small, thereby successively sucking, compressing and discharging refrigerant gas. This process is repeatedly performed.
Problems of the rotary compressor, the reciprocating compressor and the scroll compressor operated in each compression mechanism will now be described in its structural aspect, performance aspect and reliability aspect.
First, the rotary compressor will now be described.
Referring to its structural aspect, the rolling piston
5
press-fit at the rotational shaft
3
having the eccentric portion
3
a
and at the eccentric portion
3
a
and a plurality of balance weights
6
coupled to the rotor
2
for a rotational balance of the eccentric portion
3
are used. Thus, as the parts are increased in number, its construction is complicated. In addition, since the sliding contact portion is wide, oil use amount is increased.
Referring to its performance, since the eccentric portion
3
a
of the rotational shaft
3
and the rolling piston
5
inserted into the eccentric portion
3
a
are positioned inside the compression space (P) of the cylinder
4
, the compression volume is small compared to the compression mechanism part. In addition, when the rotational shaft
3
is rotated once, compression stroke is made by one time, so that the compression performance is low. Moreover, since a rotational torque becomes large as the plurality of balance weights
6
are attached, the loss of power is large.
Referring to its reliability, the eccentric portion
3
a
formed at the rotational shaft
3
and the rolling piston
5
are eccentrically rotated, so that a vibration noise is generated during the rotation.
Secondly, the reciprocating compressor will now be described.
Referring to its structural aspect, the crank shaft
13
provided with the eccentric portion
13
a
, the piston
14
coupled to the crank shaft
13
and the balance weight
13
b
for a rotational balance with the eccentric portion
13
a
formed at the crank shaft
13
are used. Thus, the number of parts is increased to complicate its structure. In addition, since the sliding contact area between the piston
14
and the cylinder
15
is wide, so that more oil is to be used.
Referring to its performance, the piston
14
compresses gas while being reciprocally moved in the compression space (P) formed in the cylinder
15
, the compression discharge amount can be somewhat increased when the crank shaft
13
is rotated one time. But since one time of compression stroke is made for one time of rotation of the crank shaft
13
, it's also inefficient. In addition, since the rotation torque becomes large by the eccentric portion
13
a
of the crank shaft
13
and the balance weight
13
b
, a loss in the driving power is large.
Referring to its reliability, since the eccentric portion
13
a
formed at the crank shaft
13
is eccentrically rotated, a vibration noise is generated. Also, since the valve assembly
16
is operated in sucking and discharging gas, the sucking/discharging noise is loud.
Lastly, the scroll compressor will now be described.
Referring to its structural aspect, since the rotational shaft
23
having the eccentric portion
23
a
, the revolving scroll
24
having the wraps in an involute curve form, and the balance weight
26
for a rotation balance of the fixing scroll
25
and the eccentric portion
23
a
are used, the parts are increased in number and its construction is complicated. In addition, processing of the revolving scroll
24
and the fixing scroll
25
is very difficult.
Referring to its performance and reliability, the plurality of compression pockets formed by the wrap
24
a
of the revolving scroll
24
and the wrap
25
a
of the fixing scroll
25
continuously compresses the refrigerant gas. Thus, the compression performance is desirable, but a vibration noise is generated due to the revolving movement of the revolving scroll and the eccentric movement appearing at the eccentric portion
23
a
formed at the rotational shaft
23
.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a reciprocating compressor that is capable of minimizing a loss of driving force, reducing noise occurrence, simplifying a structure and heightening a precision of assembly.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a reciprocating compressor including: a closed container having a suction tube and a discharge tube connected thereto; a reference frame elastically supported and mounted in the closed container; a driving motor mounted at one side of the reference frame and generating a linear reciprocating driving force;
Kim Byung Jik
Kim Dong Han
Kim Hyeong Seok
Park Jin Sung
Belena John F
Yu Justine R.
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