U.S. patent application number 10/348978 was filed with the patent office on 2004-02-26 for reciprocating compressor.
This patent application is currently assigned to LG ELECTRONICS INC.. Invention is credited to Kim, Byung-Jik, Kim, Dong-Han, Kim, Hyeong-Seok, Park, Jin-Sung.
Application Number | 20040037725 10/348978 |
Document ID | / |
Family ID | 31492893 |
Filed Date | 2004-02-26 |
United States Patent
Application |
20040037725 |
Kind Code |
A1 |
Kim, Byung-Jik ; et
al. |
February 26, 2004 |
Reciprocating compressor
Abstract
A reciprocating compressor, including a piston which performs a
reciprocating movement by receiving a driving force of a
reciprocating motor, a cylinder in which a piston is inserted to
form compression spaces therein together with the piston, and an
inclined discharging surface is formed at the end surface and a
valve assembly including a discharging cover which is combined with
a side of the cylinder, a discharging valve which is installed at
an end of the cylinder to adjust gas discharge in the compression
spaces and a valve spring for elastically supporting the
discharging valve.
Inventors: |
Kim, Byung-Jik; (Seoul,
KR) ; Kim, Hyeong-Seok; (Gyeonggi- Do, KR) ;
Kim, Dong-Han; (Gyeonggi-Do, KR) ; Park,
Jin-Sung; (Gwangmyeong, KR) |
Correspondence
Address: |
GREENBLUM & BERNSTEIN, P.L.C.
1950 ROLAND CLARKE PLACE
RESTON
VA
20191
US
|
Assignee: |
LG ELECTRONICS INC.
Seoul
KR
|
Family ID: |
31492893 |
Appl. No.: |
10/348978 |
Filed: |
January 23, 2003 |
Current U.S.
Class: |
417/570 |
Current CPC
Class: |
F04B 39/102
20130101 |
Class at
Publication: |
417/570 |
International
Class: |
F04B 039/10 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 21, 2002 |
KR |
49514/2002 |
Claims
What is claimed is:
1. A reciprocating compressor, comprising: a piston which performs
a reciprocating movement by receiving a driving force of a
reciprocating motor; a cylinder in which a piston is inserted to
form compression spaces therein together with the piston, and a
inclined discharging surface is formed at the end surface; and a
discharging valve assembly including a discharging cover which is
combined with a side of the cylinder, a discharging valve which is
installed at an end of the cylinder to adjust gas discharge in the
compression spaces and a valve spring for elastically supporting
the discharging valve.
2. The compressor of claim 1, wherein the rear surface of the
discharging valve is positioned to be linearly contacted on the
inclined discharging surface.
3. The compressor of claim 1, wherein the inclined discharging
surface is adjacent to the inner circumferential surface of the
cylinder.
4. The compressor of claim 1, wherein a pressure supporting surface
which is contacted on the inclined discharging surface is protruded
and formed at a predetermined curvature.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a reciprocating compressor
and particularly, to a reciprocating compressor, capable of
improving compression performance by improving structures of a
discharging valve for adjusting discharge of gas and an end surface
of the cylinder which is rubbed and contacted with the discharging
valve.
[0003] 2. Description of the Background Art
[0004] Generally, a compressor is an instrument for compressing
refrigerant gas under the condition of low temperature and
pressure, which is introduced from an evaporator and discharging
the gas by changing the condition to high temperature and
pressure.
[0005] The compressor can be classified to a rotary compressor,
reciprocating compressor and a scroll compressor according to the
method of compressing fluid.
[0006] Particularly, the reciprocating compressor sucks and
compresses fluid while a piston moves linearly, and such
reciprocating compressor is divided into a method which compresses
fluid by converting the rotary movement of a driving motor into a
reciprocating movement of the piston, and a method which compresses
and sucks fluid by having the piston perform a reciprocating
movement as the driving motor performs a linear reciprocating
movement.
[0007] FIG. 1 is a cross-sectional view showing a conventional
reciprocating compressor, FIG. 2 is a partially cross-sectional
view showing an operation state of a discharging valve assembly in
operating suction of gas in FIG. 1 and FIG. 3 is a partially
cross-sectional view showing an operation state of a discharging
valve assembly in operating discharging of gas in FIG. 1.
[0008] As shown in the drawing, the conventional reciprocating
compressor includes a case 10 having a gas suction pipe SP and gas
discharging pipe DP, a frame unit 20 which is elastically installed
inside the case 10, a reciprocating motor 30 for generating a
driving force while being fixed on the frame unit 20, a compression
unit 40 for sucking, compressing and discharging gas using a linear
reciprocating force of the reciprocating motor 30 and a resonance
spring unit 50 for inducing resonating movement by elastically
supporting the compression unit 40 in the movement direction.
[0009] The frame unit 20 includes a front frame 21 for supporting
the compression unit 40, a middle frame 22 which is combined with
the front frame 21, for supporting the front side of the
reciprocating motor 30, and a rear frame 23 which is combined with
the middle frame 22, for supporting the rear side of the
reciprocating motor 30.
[0010] The reciprocating motor 30 includes an outer stator 31 which
is installed between the middle frame 22 and rear frame 23, an
inner stator 32 which is combined with the outer stator 31 at a
predetermined interval and is inserted and combined with the rear
frame 23, and a movable element 33 which is installed between the
outer stator 31 and inner stator 32, for performing a linear
reciprocating movement.
[0011] The compression unit 40 includes a cylinder 41 which is
integrally formed in the front frame 21, a piston 42 which is
combined with the movable element 33 of the reciprocating motor 30,
for performing a reciprocating movement in a compression space P1
of the cylinder 41, a suction valve 43 which is mounted at the
front end of the piston 42, for restricting suction of gas opening
and closing the suction path F of the piston 42 and a discharging
valve assembly 70 which is mounted at the discharging side of the
cylinder 41, for adjusting discharge of compression gas while
opening and closing the compression space P1.
[0012] The discharging valve assembly 70 includes a discharging
cover 71 for covering a side of the cylinder 41, a discharging
valve 72 which is inserted inside the discharging cover 71, for
opening and closing the compression space P1 of the cylinder 41 and
a valve spring 73 which is supported on the inner side of the
discharging cover 71 and is combined with the discharging valve 72,
for elastically supporting the discharging valve 72 while setting
the position of the discharging valve 72.
[0013] The operation process of the conventional reciprocating
compressor with the above construction will be described as
follows.
[0014] When a flux is formed between the outer stator 31 and inner
stator 32 by applying a power source to the reciprocating motor 30,
the movable element 33 of the reciprocating motor 3 elastically
performs a reciprocating movement by the resonance spring unit
50.
[0015] At this time, as the piston 42 performs a reciprocating
movement inside the cylinder 41, the volume of the compression
space P1 is changed, and the gas is sucked and compressed.
[0016] As the pressure of the gas is higher than a predetermined
pressure, when it becomes higher than an elastic force of the valve
spring 73, the discharging valve 72 is moved. As the sequential
process that the compression gas is discharged into the compression
space P2 is repeated, the discharged gas by opening and closing of
the discharging valve 72 is discharged to the outside through a gas
discharging pipe DP which is formed in the discharging cover
71.
[0017] However, as shown as a wave-line in FIG. 2, conventionally,
in case the compressor is operated for a long time, the discharging
valve 72 is deformed by a pressure difference of the compression
spaces P1 and P2 and abrasion is occurred at the contact portion by
friction contact between the discharging valve 72 and cylinder
41.
[0018] In case the discharging valve is deformed and the end
surface of the cylinder is worn away, the performance of the
discharging valve 72 is degraded and accordingly the performance of
the compressor is degraded.
SUMMARY OF THE INVENTION
[0019] Therefore, an object of the present invention is to provide
a reciprocating compressor, capable of improving compression
performance by improving structures of a discharging valve for
adjusting discharge of gas and an end surface of the cylinder which
is rubbed and contacted with the discharging valve.
[0020] 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 piston which performs a reciprocating movement by
receiving a driving force of a reciprocating motor, a cylinder in
which a piston is inserted to form compression spaces therein
together with the piston, and an inclined discharging surface is
formed at the end surface and a valve assembly including a
discharging cover which is combined with a side of the cylinder, a
discharging valve which is installed at an end of the cylinder to
adjust gas discharge in the compression spaces and a valve spring
for elastically supporting the discharging valve.
[0021] 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 invention when
taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings, which are included to provide a
further understanding of the invention and are incorporated in and
constitute a part of this specification, illustrate embodiments of
the invention and together with the description serve to explain
the principles of the invention.
[0023] In the drawings:
[0024] FIG. 1 is a cross-sectional view showing a conventional
reciprocating compressor;
[0025] FIG. 2 is a partially cross-sectional view showing an
operation state of a discharging valve assembly in operating
suction of gas in FIG. 1;
[0026] FIG. 3 is a partially cross-sectional view showing an
operation state of a discharging valve assembly in operating
discharging of gas in FIG. 1;
[0027] FIG. 4 is a longitudinal sectional view showing a
reciprocating compressor in accordance with the present
invention;
[0028] FIG. 5 is a partially cross-sectional view showing an
operation state of a discharging valve assembly in performing gas
suction in FIG. 4; and
[0029] FIG. 6 is a partial cross-sectional view showing an
operation state of a discharging valve assembly in performing gas
discharging in FIG. 4.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0030] Reference will now be made in detail to the preferred
embodiments of the present invention, examples of which are
illustrated in the accompanying drawings.
[0031] FIG. 4 is a longitudinal sectional view showing a
reciprocating compressor in accordance with the present invention,
FIG. 5 is a partially cross-sectional view showing an operation
state of a discharging valve assembly in performing gas suction in
FIG. 4, and FIG. 6 is a partial cross-sectional view showing the
operation state of a discharging valve assembly in performing gas
discharging in FIG. 4.
[0032] As shown in the drawing, the reciprocating compressor in
accordance with the present invention includes a case 10 having a
gas suction pipe SP and gas discharging pipe DP, a frame unit 20
which is elastically installed inside the case 10, a reciprocating
motor 30 for generating a driving force while being fixed on the
frame unit 20, a compression unit 140 for sucking, compressing and
discharging gas using a linear reciprocating force of the
reciprocating motor 30 and a resonance spring unit 50 for inducing
resonating movement by elastically supporting the compression unit
140 in the movement direction.
[0033] The compression unit 140 includes a cylinder 141 which is
formed in the front frame 121, a piston 142 which is combined with
the movable element 133 of the reciprocating motor 130, for
performing a reciprocating movement in a compression space P1 of
the cylinder 141, a suction valve 143 which is mounted at the front
end of the piston 142, for controlling suction of gas opening and
closing the suction path F of the piston 142 and a discharging
valve assembly 170 which is mounted at the discharging side of the
cylinder 141, for adjusting discharge of compression gas while
opening and closing the compression spaces P1 and P2.
[0034] The discharging valve assembly 170 includes a discharging
cover 171 which is formed to have a predetermined space, for
covering a side of the cylinder 141 again, a discharging valve 172
which is inserted inside the discharging cover 171, for opening and
closing the compression spaces P1 and P2 of the cylinder 141 and a
valve spring 173 which is supported on the inner side of the
discharging cover 171 and is combined with the discharging valve
172, for elastically supporting the discharging valve 172 while
setting the position of the discharging valve 172.
[0035] As a characteristic of the present invention, an inclined
discharging surface 141B is formed on the end surface of the
cylinder 141. In other words, the inclined discharging surface 141B
is formed on a cylinder discharging surface 141A which is adjacent
to the inner circumferential surface of the cylinder 141 and is
contacted on the compression space P1.
[0036] Also, the pressure supporting surface 172A is protruded and
formed at a predetermined curvature on the rear surface of the
discharging valve 172, which is abutted on the cylinder discharging
space 141A of the cylinder 141.
[0037] The outer portion of the pressure supporting surface 172A is
composed to be abutted on the inclined discharging surface 141B of
the cylinder 141.
[0038] In the initial driving without deformation of the
discharging valve 172, the outline of the pressure supporting
surface 172A is linearly contacted with the inclined discharging
surface 141B of the cylinder 141, and even if the discharging valve
172 is deformed by the operation for a long time, the outline of
the pressure supporting surface 172A is also linearly contacted
with the inclined discharging surface 141B of the cylinder 141.
[0039] In other words, even though the discharging valve 172 is
deformed, the rear surface of the discharging valve 172 is formed
at a predetermined curvature so that the end surfaces of the
discharging valve 172 and the cylinder 141 are not rubbed and
contacted, and the inclined discharging surface 141B is formed at
an end surface of the cylinder 141.
[0040] The operation effect of the reciprocating compressor with
the above construction will be described as follows.
[0041] When the gas is sucked into the compression space P1 and
compressed while varying the volume of the compression space P1 as
the piston 142 performs a reciprocating movement inside the
cylinder 141, the pressure of the gas becomes higher than a
predetermined pressure. Wen the pressure becomes higher than that
of the elastic force of the valve spring 173, the discharging valve
172 is moved.
[0042] At this time, the pressure supporting surface 172A of the
discharging valve 172 is opened, and the compressed gas is
discharged to the compression space P2 through the opened gap.
[0043] The gas which is discharged to the compression space P2 is
discharged through the gas discharging pipe DP which is connected
to the discharging cover 171.
[0044] When the pressure of the compression space P1 becomes lower
than a predetermined pressure by moving the compressed gas to the
compression space P2, the discharging valve 172 is restored to the
original state by the elastic force of the valve spring 173, and
the sequential process of sucking and compressing the gas is
repeatedly performed again.
[0045] Since the pressure supporting surface 172A of the
discharging valve 172 which is protruded at a predetermined
curvature is linearly contacted on the inclined discharging surface
141B of the cylinder 141, suction noise can be reduced by reducing
the contact area.
[0046] Also, in case the process of suction, compression and
discharge is repeatedly performed for a long time, the discharging
valve 172 can be deformed by abrasion by friction and pressure
difference of the compression spaces P1 and P2.
[0047] At this time, since the pressure supporting surface 172A of
the discharging valve 172 maintains a linearly contacted state with
the inclined discharging surface 141B, the opening and closing
performance of the discharging valve can be maintained.
[0048] As described above, the present invention can improve the
compressing performance by maintaining opening and closing
performance even though the discharging valve is deformed by using
the valve for a long time, and the discharging valve and cylinder
are linearly contacted, thus to reduce suction noise.
[0049] As the present invention may be embodied in several forms
without departing from the spirit or essential characteristics
thereof, it should also be understood that the above-described
embodiments are not limited by any of the details of the foregoing
description, unless otherwise specified, but rather should be
construed broadly within its spirit and scope as defined in the
appended claims, and therefore all changes and modifications that
fall within the metes and bounds of the claims, or equivalence of
such metes and bounds are therefore intended to be embraced by the
appended claims.
* * * * *