U.S. patent application number 11/731219 was filed with the patent office on 2007-10-11 for hermetic compressor.
This patent application is currently assigned to SAMSUNG GWANGJU ELECTRONICS CO., LTD. Invention is credited to Bo Hyun Kim.
Application Number | 20070237663 11/731219 |
Document ID | / |
Family ID | 38575496 |
Filed Date | 2007-10-11 |
United States Patent
Application |
20070237663 |
Kind Code |
A1 |
Kim; Bo Hyun |
October 11, 2007 |
Hermetic compressor
Abstract
Disclosed is a hermetic compressor capable of preventing an
intake valve from making contact with a piston without reducing
compressing efficiency of the compressor. The hermetic compressor
includes a cylinder block having a compressing chamber, a piston
performing a reciprocation, a cylinder block coupled at an side of
the cylinder block so as to close the compressing chamber and an
intake valve plate which is provided between the cylinder block and
the cylinder head and has an intake valve which controls a flow of
a refrigerant introduced into the compressing chamber, wherein a
compressing surface of the piston facing the intake valve plate
forms a flat surface parallel to the intake valve plate and an
anti-contact portion which receives a part of the intake valve is
formed on the compressing surface so as to prevent the piston from
making contact with the intake valve during the reciprocation of
the piston.
Inventors: |
Kim; Bo Hyun; (Gwangju,
KR) |
Correspondence
Address: |
Charles N.J. Ruggiero;Ohlandt, Greeley, Ruggiero & Perle, L.L.P.
10th Floor, One Landmark Square
Stamford
CT
06901-2682
US
|
Assignee: |
SAMSUNG GWANGJU ELECTRONICS CO.,
LTD
|
Family ID: |
38575496 |
Appl. No.: |
11/731219 |
Filed: |
March 30, 2007 |
Current U.S.
Class: |
417/562 |
Current CPC
Class: |
F04B 39/0005 20130101;
F04B 39/1073 20130101 |
Class at
Publication: |
417/562 |
International
Class: |
F04B 39/10 20060101
F04B039/10 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 10, 2006 |
KR |
2006-32423 |
Claims
1. A hermetic compressor comprising: a cylinder block having a
compressing chamber; a piston performing a reciprocation in the
compressing chamber; a cylinder head which is coupled to one side
of the cylinder block so as to close the compressing chamber; and
an intake valve plate having an intake valve which is provided
between the cylinder block and the cylinder head so as to control a
flow of a refrigerant which is introduced into the compressing
chamber, wherein a compressing surface of the piston facing the
intake valve plate forms a flat surface parallel to the intake
valve plate, and an anti-contact portion which receives a part of
the intake valve is formed on the compressing surface so as to
prevent the piston from making contact with the intake valve during
the reciprocation of the piston.
2. The hermetic compressor as claimed in claim 1, wherein the
anti-contact portion includes a recess having a shape corresponding
to a shape of the intake valve.
3. The hermetic compressor as claimed in claim 2, wherein the
anti-contact portion has a width larger than a width of the intake
valve so that the intake valve passes through the anti-contact
portion.
4. The hermetic compressor as claimed in claim 2, wherein the
intake valve is formed by cutting the intake valve plate, in which
one end of the intake valve serves as a fixing end and the other
end of the intake valve serves as a free end.
5. The hermetic compressor as claimed in claim 4, wherein a depth
of the anti-contact portion gradually increases from the fixing end
to the free end.
6. The hermetic compressor as claimed in claim 2, wherein a volume
of the anti-contact portion is set within a predetermined range
which does not reduce a compressing efficiency of the hermetic
compressor.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of Korean Patent
Application No. 2006-32423 filed on Apr. 10, 2006, in the Korean
Intellectual Property Office, the disclosure of which is
incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a hermetic compressor, and
more particularly to a hermetic compressor capable of preventing an
intake valve from making contact with a piston without reducing the
compressing efficiency of the compressor.
[0004] 2. Description of the Prior Art
[0005] A hermetic compressor has been widely used in a
refrigerating cycle for a refrigerator or an air conditioner. Such
a hermetic compressor includes a closed casing forming an external
appearance, a compressing unit which is provided in the closed
casing to compress refrigerant and a driving unit which provides
the compressing unit with driving force.
[0006] Among these components, the compressing unit includes a
cylinder block forming a compressing chamber in which the
refrigerant is compressed, a piston performing a linear
reciprocation in the compressing chamber so as to compress the
refrigerant, a cylinder head coupled to one side of the cylinder
block so as to close the compressing chamber and provided with an
intake chamber and an exhaust chamber that are separated from each
other, and a valve unit which is provided between the cylinder
block and the cylinder head so as to control the flow of the
refrigerant which is introduced into the compressing chamber from
the intake chamber or is exhausted from the compressing chamber
into an exhaust chamber.
[0007] Under this configuration, if the driving unit is operated,
the piston performs the linear reciprocation in the compressing
chamber so that the refrigerant provided at an outer portion of the
closed casing is introduced into the intake chamber of the cylinder
head, and then is transferred to the compressing chamber so that
the refrigerant is compressed in the compressing chamber. In this
manner, the refrigerant compressed in the compressing chamber is
exhausted into the exhaust chamber of the cylinder head and then is
exhausted out of the closed casing through an exhaust tube. Such a
process is repeated, so that the refrigerant is compressed by means
of the compressor.
[0008] The valve unit includes a valve plate having an intake hole
and an exhaust hole through which the compressing chamber is
communicated with the intake chamber and the exhaust chamber, an
intake valve which opens/closes the intake hole and an exhaust
valve assembly which opens/closes the exhaust hole.
[0009] the intake valve is designed to be easily opened according
to the movement of the piston during an intake process of such a
hermetic compressor. In order to allow the intake valve to be
easily opened, the intake valve is designed to be easily bent
according to pressure variation in the compressing chamber.
[0010] Since the intake valve is designed to be easily bent
according to the pressure variation in the compressing chamber, if
the intake vlave is excessively bent relative to the moving
distance of the piston when the piston moves from the top dead
point to the bottom dead point, the intake valve makes contact with
a surface of the piston. If the intake valve makes contact with the
piston, the intake valve or the piston may be broken, degrading the
reliability of the product. In addition, if debris derived from the
breakage remains in the compressing chamber, the cylinder block may
be worn.
[0011] In this manner, in order to prevent the intake valve from
making contact with the piston, a gasket having a large thickness
is interposed between the piston and the intake valve. However, if
the thickness of the gasket is too large, a dead volume is
increased between the piston and the intake valve, degrading the
compressing efficiency of the compressor.
SUMMARY OF THE INVENTION
[0012] The present invention has been made to solve the
above-mentioned problems occurring in the prior art, and an object
of the present invention is to provide a hermetic compressor
capable of preventing an intake valve from making contact with a
piston without reducing the compressing efficiency of the
compressor.
[0013] In order to accomplish the above object, according to an
aspect of the present invention, there is provided a hermetic
compressor comprising a cylinder block having a compressing
chamber, a piston performing a reciprocation in the compressing
chamber, a cylinder head which is coupled to one side of the
cylinder block so as to close the compressing chamber and an intake
valve plate having an intake valve which is provided between the
cylinder block and the cylinder head so as to control a flow of a
refrigerant which is introduced into the compressing chamber,
wherein a compressing surface of the piston facing the intake valve
plate forms a flat surface parallel to the intake valve plate, and
an anti-contact portion which receives a part of the intake valve
is formed on the compressing surface so as to prevent the piston
from making contact with the intake valve during the reciprocation
of the piston.
[0014] The anti-contact portion includes a recess having a shape
corresponding to a shape of the intake valve.
[0015] The anti-contact portion has a width larger than a width of
the intake valve so that the intake valve passes through the
anti-contact portion.
[0016] The intake valve is formed by cutting the intake valve
plate, in which one end of the intake valve serves as a fixing end
and the other end of the intake valve serves as a free end.
[0017] A depth of the anti-contact portion gradually increases from
the fixing end to the free end.
[0018] A volume of the anti-contact portion is set within a
predetermined range which does not reduce a compressing efficiency
of the hermetic compressor.
[0019] A volume of the anti-contact portion is set within a
predetermined range which does not reduce a compressing efficiency
of the hermetic compressor.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is a schematic sectional view representing a hermetic
compressor according to an embodiment of the present invention;
[0021] FIG. 2 is an exploded perspective view representing a valve
unit and a piston shown in FIG. 1;
[0022] FIG. 3 is a sectional view representing a piston when the
piston shown in FIG. 2 reaches a top dead point; and
[0023] FIG. 4 is a sectional view representing an operation of an
intake valve when the piston moves back from the top dead
point.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0024] Hereinafter, a hermetic compressor according to a preferred
embodiment of the present invention will be explained in detail
with reference to the accompanying drawings.
[0025] A hermetic compressor according to an embodiment of the
present invention is as shown in FIG. 1 includes a closed casing 1
in which a top casing 1a and a bottom casing 1b are coupled with
each other, a compressing unit 10 which is provided in the closed
casing 1 to compress refrigerant and a driving unit 20 which
provides the compressing unit 10 with driving force. An intake tube
2 which guides the refrigerant from an exterior into the closed
casing 1 is provided at one side of the closed casing 1 and an
exhaust tube 3 which exhausts the compressed refrigerant in the
compressed unit 10 into the outside of the closed casing 1 is
provided at the other side of the closed casing 1.
[0026] Among these components, the compressing unit 10 includes a
cylinder block 11 which has a compressing chamber 11a for
compressing the refrigerant, a piston 12 which compresses the
refrigerant while performing a linear reciprocation in the
compressing chamber 11a, a cylinder head 13 which is coupled to one
side of the cylinder block 11 to close the compressing chamber 11a
and has an intake chamber 13aand an exhaust chamber 13b that are
separated from each other, and a valve unit 30 which is provided
between the cylinder block 11 and the cylinder head 13 and controls
a flow of the refrigerant which is introduced into the compressing
chamber 11a from the intake chamber 13a, or is exhausted from the
compressing chamber 11a into the exhaust room 13b.
[0027] the driving unit 20 provides a driving force to allow the
piston 12 to reciprocate in the compressing chamber 11a, and
includes a stator 21 fixed in the closed casing 1 and a rotor 22
which is spaced apart from the stator 21 so as to
electro-magnetically interact with the stator 21. A rotating shaft
23 is provided on the center portion of the rotor 22 such that the
rotating shaft 23 can rotate together with the rotor 22. Provided
below the rotating shaft 23 are an eccentric portion 24, which is
eccentrically rotated, and a connecting rod 25. In order to convert
the eccentric movement of the eccentric portion 24 connecting rod
25. In order to convert the eccentric movement of the eccentric
portion 24 into the linear movement, one end of the connecting rod
25 is rotatably coupled to the eccentric portion 24 and the other
end of the connecting rod 25 is coupled to the piston 12 such that
the connecting rod 25 can perform the linear and rotating
movement.
[0028] When a power is applied to the hermetic compressor, the
rotating shaft 23 is rotated according to an electromagnetic
interaction between the stator 21 and the rotor 22, and the piston
12 which is connected with the eccentric portion 24 by means of the
connecting rod 25 performs the linear reciprocation in the
compressing chamber 11a. Through this process, the refrigerant
remaining at the outside of the closed casing 1 is introduced into
the intake chamber 13aof the cylinder head 13 through the intake
tube 2 and then is transferred to the compressing chamber 11a so as
to be compressed in the compressing chamber 11a. In this manner,
the refrigerant compressed in the compressing chamber 11a is
exhausted into the exhaust chamber 13b of the cylinder head 13 and
is exhausted out of the closed casing 1 through an exhaust tube
4.
[0029] Meanwhile, a valve unit 30 includes a valve plate 40 which
has an intake hole 41 and an exhaust hole (not shown) through which
the compressing chamber 11a of the cylinder block 11 communicates
with the intake chamber 13a and the exhaust chamber 13b of the
cylinder 13. Further, an intake valve plate 35 having an intake
valve 31, which opens/closes the intake hole 41, is assembled to
one side surface of the valve plate 40 facing the cylinder block 11
and an exhaust valve assembly 50, which opens/closes the exhaust
hole, is assembled to the other side surface of the valve plate 40
facing the cylinder head 13.
[0030] For reference, reference numerals 32 and 33 represent
gaskets which are interposed between the cylinder head 13 and the
valve plate 40, and between the cylinder block 11 and the intake
valve plate 35, respectively. Bolt coupling holes are formed at
outer peripheral portions of the gaskets, 32 and 33, the valve
plate 40, and the cylinder head 13, respectively. Such a valve unit
30 is installed between the cylinder block 11 and the cylinder head
13 by means of a fixing bolt 34, which is screw-coupled into the
bolt coupling hole from the outside the cylinder head 13 so as to
be coupled with the cylinder block 11.
[0031] A peripheral portion of the intake valve 31, except for an
end portion thereof, is cut from the intake valve plate 35 so that
the intake valve 31 is integrally formed with the intake valve
plate 35. At this time, one end portion of the intake valve 31
serves as a fixing end 31a fixed to the intake plate 35 and the tip
portion of the intake valve 31 serves as a free end 31b, which is
elastically deformed so as to open or close the intake hole 41.
[0032] Meanwhile, the piston 12, which is guided by the cylinder
block 11 while moving in forward and backward directions, has a
cylindrical shape and a compressing surface 12a of the piston 12
facing the intake valve plate 35 forms a flat surface which is
parallel to the intake valve plate 35. Further, the compressing
surface 12a has an anti-contact portion 60 so as to prevent the
compressing surface 12a from making contact with the intake valve
31 during the reciprocation of the piston 12.
[0033] The anti-contact portion 60 is a recess having a shape
corresponding to the shape of the intake valve 31 and the volume of
the anti-contact portion 60 is set within a range which does not
reduce the compressing efficiency of the hermetic compressor. In
addition, the anti-contact portion 60 has a width larger than a
width of the intake valve 31, so that the intake valve 31 can pass
through the anti-contact portion 60 when the free end 31b of the
intake valve 31 is bent to be received in the anti-contact portion
60.
[0034] In addition, since the free end 31b of the intake valve 31
is rotated about the fixing end 31a, the depth of the anti-contact
portion 60 is gradually increased from the fixing end 31a to the
free end 31b.
[0035] Hereinafter, the operation and functions of the hermetic
compressor according to the exemplary embodiment of the present
invention will be explained with reference to FIGS. 3 and 4.
[0036] FIG. 3 is a view representing a piston when the piston moves
forward to the maximum extent so as to reach a top dead point. At
this time, pressure is applied in a direction in which the piston
12 pushes the intake valve 31, so that the intake valve 31 does not
open the intake hole 41.
[0037] FIG. 4 is a view representing positions of the piston 12 and
the intake valve 31 when the piston 12 moves back from the top dead
point to the bottom dead point. If the piston 12 reaches the top
dead point and moves back to the bottom dead point, negative
pressure is applied to an inside of the compressing chamber 11a, so
that the free end 31b of the intake valve 31 is bent toward the
inside of the compressing chamber 11a about the fixing end 31a.
[0038] In this case, the anti-contact portion 60, which can receive
the free end 31b of the intake valve 31, is formed on the
compressing surface 12a of the piston 12 so as to prevent the
intake valve 31 from making contact with the piston 12.
[0039] As described above, the hermetic compressor according to the
present invention can prevent the components from being damaged by
preventing the intake valve from making contact with the piston,
and can prevent the cylinder block from being worn by preventing
debris derived from the breakage of the components from being
introduced into the compressing chamber.
[0040] In addition, since the recess having a minimum volume is
formed in the compressing surface of the piston, the distance
between the piston and the intake valve plate can be reduced, so
that the compressing efficiency of the compressor can be prevented
from being degraded.
* * * * *