[0001] The present invention relates to a gas compressor, and more particularly to a gas
compressor in which a gas leakage from compression chambers of a cylinder is suppressed
to thereby make it possible to enhance compressor characteristics such as a volumetric
efficiency.
[0002] A longitudinal sectional view of a conventional vane rotary type gas compressor 1
used in an automotive air-conditioner or the like is shown in Fig. 9. Also, a cross-sectional
view taken along the line A-A of Fig. 9 is shown in Fig. 10.
[0003] In Figs. 9 and 10, a front head 5, a front side block 7, a cylinder 9, and a rear
side block 11 are arranged in this order from a rotary transmission portion 3 side
in the gas compressor 1. Also, a rotary shaft 13 is pivotally supported so as to penetrate
the interior of the cylinder 9 and a rear cover 15 is provided.
[0004] Compression chambers 21 are formed in the interior of the cylinder 9 for compressing
refrigerant gas, and an intake chamber 23 for feeding the refrigerant gas into the
compression chambers 21 is formed in the interior of an intake port 17 of the front
head 5. A discharge chamber 25 for receiving the refrigerant gas compressed in the
compression chambers 21 is formed in the interior of the rear cover 15, and a discharge
port 27 is opened to the rear cover 15.
[0005] An inner circumferential surface of the cylinder 9 is formed substantially into an
elliptical shape in cross section. One end of the cylinder 9 is fastened and fixed
in intimate contact with the front side block 7 and the other end is fastened and
fixed in intimate contact with the rear side block 11 so that both ends of the cylinder
9 are closed to form the compression chambers 21 in its interior.
[0006] A plurality of partitioning plate-like vanes 31... extending to both side blocks
7 and 11 are arranged substantially radially in the interior of the cylinder 9. Each
vane 31... is fitted retractably and projectably in the radial direction to a groove
33a... of a rotor 33 formed on the rotary shaft 13. A hydraulic pressure is introduced
into each groove 33a... of this rotor 33, and each vane 31... is biased in contact
with the inner circumferential surface of the cylinder 9 by a centrifugal force generated
upon the rotation and the hydraulic pressure. The interior of the cylinder 9 is partitioned
into the plurality of compression chambers 21 by these vanes 31...
[0007] Also, a discharge port 35 for discharging the compressed refrigerant gas is caused
to pass through a circumferential wall of the cylinder 9, and a cylinder cutaway portion
39 provided with a discharge valve 37 is formed on its outer side. In addition, an
intake portion 41 for feeding the refrigerant gas into the interior of the cylinder
9, a hydraulic path 43 for lubricant oil, bolt holes 45 for fastening, and the like
are formed in the axial direction of the cylinder.
[0008] In the thus constructed gas compressor 1, when the rotary shaft 13 is rotated, each
vane 31... of the compression chambers 21 slides along the inner circumferential surface
of the cylinder 9 so that the volume of the compression chamber 21 is changed in accordance
with the change in its radius. The intake and the compression of the gas is performed
by the change in volume.
[0009] The sucked refrigerant gas is introduced from the intake chamber 23 in the interior
of the front head 5 to the interior of the cylinder 9. Also, the compressed refrigerant
gas is fed to the discharge chamber 25 in the interior of the rear cover 15 through
the cylinder cutaway portion 39 in the outer circumferential portion of the cylinder
9 from the discharge port 35 of the cylinder 9.
[0010] By the way, upon assembling, a clearance 40 is generated between the rear cover 15
and the cylinder 9 and this clearance 40 is in communication with the cylinder cutaway
portion 39. Accordingly, in some cases, the refrigerant gas compressed in the cylinder
9 and kept at a high temperature and a high pressure is introduced into the compression
chambers 21 or the intake portion 41, which are spaces at a lower pressure than that
of the cylinder cutaway portion 39, through the cylinder cutaway portion 39 and the
clearance 40 and further through a close contact portion between the cylinder 9 and
both side blocks 7 and 11. The state of the internal leakage during this gas flow
is shown by thick solid arrows in Figs. 9 and 10.
[0011] If the refrigerant gas which is compressed once in the cylinder 9, kept at a high
temperature and a high pressure, and discharged from the discharge port 35 is entrained
again on the intake side, the volumetric efficiency is degraded due to the resuction
of the compressed gas and the compressive efficiency is degraded due to the elevation
of the refrigerant gas temperature. Also, the heat generation upon compression takes
place in accordance with the elevation of the temperature of the refrigerant gas,
which also leads to the oil film shortage in the sliding portion due to the degradation
in viscosity of the lubricant oil.
[0012] In view of the foregoing defects inherent in the prior art, an object of the present
invention is to provide a gas compressor in which the gas leakage from compression
chambers of a cylinder is suppressed to thereby make it possible to enhance compressor
characteristics such as a volumetric efficiency.
[0013] Therefore, according to the present invention, a compressor is characterized by comprising
a cylinder having a hollow portion opened at both ends and in which at least one compression
chamber is formed in the hollow portion; two side blocks in intimate contact with
both end faces of the cylinder for sealing both ends of the cylinder, respectively;
a rear cover for storing the side block and the cylinder; and a first sealing means
interposed in a close contact portion in which at least one of the two side blocks
and the cylinder are brought into intimate contact with each other, in which the first
seal means is arranged so as to surround an opening of the hollow portion.
[0014] Since the first seal means is arranged so as to surround the opening of the hollow
portion at the end surface of the cylinder, it is possible to prevent the flow back
of the refrigerant gas from outside of the compression chamber or the cylinder to
the lower pressure region between the inside and outside of the cylinder with the
sealing means as a border.
[0015] Also, according to the present invention, a compressor is characterized by including:
a cylinder having a hollow portion opened at both ends and in which at least one compression
chamber is formed in the hollow portion; an intake portion having an opening formed
at an end surface of the cylinder for introducing refrigerant gas to the compression
chamber; two side blocks in intimate contact with both end surfaces of the cylinder
for sealing both ends of the cylinder, respectively; and a first seal means interposed
in a close contact portion in which at least one of the two side blocks and the cylinder
are brought into intimate contact with each other, in which the first seal means is
arranged at a position so as to surround the opening of the hollow portion and to
separate the opening of the intake portion and the opening of the hollow portion.
[0016] Since the first seal means is interposed for separating the opening of the intake
portion and the opening of the hollow portion in the close contact portion between
the cylinder and the side block, the hollow portion is sealed separately from the
intake portion. Accordingly, the refrigerant gas in the compression chamber may be
sealed without being entrained in the intake portion.
[0017] Furthermore, according to the present invention, the compressor is characterized
by including a second seal means for surrounding and sealing the opening of the intake
portion.
[0018] Since the second seal means is provided so as to surround the opening of the intake
portion, the intake portion may be sealed independently. Accordingly, even if the
refrigerant gas leaks from the compression chamber, it is possible to prevent the
gas from flowing into the intake portion,
[0019] Furthermore, according to a fourth aspect of the present invention, the compressor
is characterized in that a cylinder cutaway portion for receiving the refrigerant
gas discharged from the compression chamber is formed in an outer circumference of
the cylinder and a fitting projecting portion for fitting the cylinder cutaway portion
is formed in at least one of the two side blocks.
[0020] Since the fitting projecting portion fitting the cylinder cutaway portion is formed
in the side block, the refrigerant gas within the cylinder cutaway portion is sealed
and prevented from leaking by the fitting projecting portion to thereby make it possible
to secure the sealing performance.
[0021] Furthermore, according to a fifth aspect of the present invention, the compressor
is characterized by including an inner contact projecting portion for intimately contacting
the inner circumferential surface of the cylinder with at least one of the two side
blocks, in which the first seal means is interposed in the close contact portion formed
between the inner contact projecting portion and the inner circumferential surface
of the cylinder.
[0022] The first seal means is arranged for the cylinder inner circumferential surface through
the inner contact projecting portion so that, even if it is impossible to obtain a
sufficient space as the close contact portion in the cylinder end surface, it is possible
to realize the seal function without fail.
[0023] Furthermore, according to a sixth aspect of the present invention, the compressor
is characterized in that the first seal means or the second seal means is made of
an elastic sealing member and the elastic seal member is fitted in a groove formed
on one side of the two members facing each other at the close contact portion.
[0024] Since the seal member is provided so as to be fitted in the groove formed in the
close contact portion, pressure seal may be performed by means of the elastic member
having high sealing performance.
[0025] Furthermore, according to a seventh aspect the present invention, the compressor
is characterized in that the first seal means or the second seal means is formed of
a thin plate-like gasket.
[0026] The pressure seal of the close contact portion is possible by the gasket with a simple
structure.
[0027] Furthermore, according to an eighth aspect of the present invention, a compressor
is characterized by including a cylinder having a hollow portion opened at both ends
and in which at least one compression chamber is formed in the hollow portion; and
two side blocks in intimate contact with both end surfaces of the cylinder for sealing
both ends of the cylinder, respectively, in which a cylinder cutaway portion for receiving
the refrigerant gas discharged from the compression chamber is formed in a circumferential
wall outer side portion of the cylinder, a fitting projecting portion for fitting
the cylinder cutaway portion is formed in at least one of the two side block, a groove
extending to the outer circumference of the fitting projecting portion or its proximal
end is formed circumferentially in an outer circumferential edge of a close contact
portion where the side block having the fitting projecting portion and the cylinder
are brought into intimate contact with each other, and an elastic seal member is fitted
in the groove.
[0028] In the case where the cylinder cutaway portion is formed, the outer circumferential
seal may be applied by the fitting projecting portion fitting the cylinder cutaway
portion. It is possible to easily seal the introduction of the refrigerant gas from
the high pressure portion of the cylinder outer portion to the close contact portion
by the outer circumferential seal.
[0029] Embodiments of the present invention will now be described by way of further example
only and with reference to the accompanying drawings, in which:-
[0030] Fig. 1 is a perspective view of a cylinder of a gas compressor in accordance with
a first embodiment of the present invention.
[0031] Fig. 2 is a front view of a cylinder end face of Fig. 1.
[0032] Fig. 3A to 3C are partial cross-sectional views showing a seal condition of the cylinder
end face of Fig. 1.
[0033] Fig. 4A to 4D are partial cross-sectional views showing the seal condition in an
outer circumference of the cylinder end face of Fig. 1.
[0034] Fig. 5A and 5B are cross-sectional views of structural examples at both ends of a
cylinder of a gas compressor according to a second embodiment of the present invention.
[0035] Fig. 6A and 6B are longitudinal sectional views in accordance with another structural
example of Fig. 5.
[0036] Fig. 7 is a perspective view of a cylinder of a gas compressor according to a third
embodiment of the present invention.
[0037] Fig. 8 is a perspective view of a front side block of a gas compressor according
to a fourth embodiment of the present invention.
[0038] Fig. 9 is a longitudinal sectional view (view showing the state of a gas leakage)
of refrigerant a conventional vane rotary type gas compressor.
[0039] Fig. 10 is a view (showing the state of the refrigerant gas leakage) taken along
the line A-A of Fig. 9.
[0040] Embodiments of the present invention will now be described below.
[0041] A perspective view of a cylinder 9 of a gas compressor according to a first embodiment
of the present invention is shown in Fig. 1 and a front view illustrating an end surface
9a of the cylinder 9 shown in Fig. 1 is shown in Fig. 2. Note that, the same reference
numerals are used to indicate the same components as those shown in Figs. 9 and 10
and the explanation thereof will be omitted.
[0042] In Figs. 1 and 2, the end surface 9a of the cylinder 9 is formed into a circular
shape, and a hollow portion 22 thereof is opened substantially in an elliptical shape.
Cylinder cutaway portions 39 and 39 are partially formed in an outer circumferential
portion of the cylinder 9.
[0043] A seal member 51 is arranged in an elliptical shape so as to surround the opening
of a hollow portion 22 in the end surface 9a of the cylinder 9, and is arranged at
a position for separating the opening by intake portions 41 and the hollow portion
22 in the end surface 9a.
[0044] The end face 9a of the cylinder 9 is brought into intimate contact with the end face
of a front side block 7 or a rear side block 11. Then, the confronting surfaces of
these two members are brought into intimate contact with each other to form a close
contact portion.
[0045] The hollow portion 22 of the cylinder 9 is sealed tightly between the thus constructed
cylinder 9 and the front side block 7 by means of the seal member 51 provided at the
end face 9a of the cylinder 9. Then, the intake portions 41 are positively separated
from the hollow portion 22. Accordingly, the refrigerant gas of the compression chamber
21 is blocked just before the intake portions 41 and 41 by means of the seal member
51.
[0046] The specific structure of the seal member 51 will now be described.
[0047] Partial cross-sectional views of the end face 9a of the cylinder 9 in accordance
with the specific embodiments of the seal member 51 are shown in Figs, 3A to 3C.
[0048] In Figs. 3A to 3C, a groove 53 having a rectangular cross-section is formed in elliptical
shape in the end face of the cylinder 9 of Fig. 3A and an elastic seal member 55 such
as an O-ring is fitted in this groove 53. The front side block 7 is brought into intimate
contact with this seal member 55 so as to press it.
[0049] In Fig. 3B, inversely to the above description, a groove 53 facing the end face of
the cylinder 9 is formed in the front side block 7 and the seal member 55 is fitted
in this groove 53. Fig. 3C shows a case where a gasket 57 is interposed between the
cylinder 9 and the front side block 7.
[0050] In the cases of Figs. 3A and 3B, the elastic seal member 55 is fitted into the groove
53 formed in the end face of the cylinder 9 or in the member with which the seal member
is brought in contact, thereby making it possible to attain the pressure seal by the
elastic member 55 that has a good sealing performance.
[0051] Also, in the case of Fig. 3C, it is possible to perform the pressure seal between
both end faces by means of the simple structure obtained by using the gasket. The
same structure is applied between the cylinder 9 and the rear side block 11 to obtain
the same resultant effect.
[0052] Cross-sectional views showing the seal condition in the outer circumferential portions
of the cylinder end face of Fig. 1 are shown in Figs. 4A to 4D.
[0053] In Figs. 4A and 4B, the groove 54 having a rectangular cross section of Fig. 54A
is formed by means of a rectangular cutaway of the end face outer circumferential
portion of the cylinder 9 and the front side block 7. Also, a triangular cross-sectional
groove 54a of Fig. 4B is formed by means of a bevel cutaway of the end face circumferential
portion of the cylinder 9 and the front side block 7. The elastic seal members 55
such as O-rings are fitted in these grooves 54 and 54a.
[0054] In Figs. 4C and 4D, the groove 54 having a rectangular cross section of Fig. 4C is
formed by means of a rectangular cutaway of the end face outer circumferential portion
of the front side block 7 and the cylinder 9. Also, a triangular cross-sectional groove
54a of Fig. 4D is formed by means of a bevel cutaway of the end face circumferential
portion of the front side block 7 and the cylinder 9. The elastic seal members 55
such as O-rings are fitted in these grooves 54 and 54a.
[0055] An outer circumferential seal is formed for sealing the close contact portion on
the outer circumferential surface of the side block 7 and the cylinder 9 which are
in intimate contact with each other, by the rectangular cutaway groove 54 or the beveled
groove 54a. The outer circumferential seal may prevent the refrigerant gas from entering
into the close contact portion from the high pressure region of the outer portion
of the cylinder 9 by means of the simple structure in with the open groove is opened
to the outer circumferential side. Accordingly, it is possible to prevent the flow
back of the refrigerant gas from the high pressure portion to the low pressure region
of the hollow portion 22 and the intake portions 41.
[0056] A second embodiment of the present invention will now be described. Cross-sectional
views of structural examples of both ends of the cylinder 9 of the compressor according
to the second embodiment of the present invention are shown in Figs. 5A and 5B and
Figs. 6A and 6B. Incidentally, the same refcrence numerals are used to indicate the
same components as those in Fig. 3 and the explanation thereof will be omitted.
[0057] An inner contact projecting portion 61 of which is elliptical shaped internally contacting
with the inner circumferential surface of the cylinder 9 is provided in the front
side block 7 and the elastic seal member 55 is interposed between this inner contact
projecting portion 61 and the inner circumferential surface of the cylinder 9. In
the same manner, an inner contact projecting portion 63 internally contacting with
the inner circumferential surface of the cylinder 9 is provided in the rear side block
11 and an elastic seal member 55 is interposed between this inner contact projecting
portion 63 and the inner circumferential surface of the cylinder 9.
[0058] Fig. 5A shows an example in which a groove 53 is formed in the circumferential surface
of the inner contact projecting portion 61 of the front side block 7, an elastic seal
member 55 is fitted therein, and in the same manner, a groove 53 is formed in the
outer circumferential surface of the inner contact projecting portion 63 of the rear
side block 11 and an elastic seal member 55 is fitted therein. Fig, 5B shows an example
in which a triangular groove 53a is formed instead of the groove 53 having a rectangular
cross-section.
[0059] Fig. 6A shows an example in which a groove 53 is formed at a position facing the
outer circumferential surface of the inner contact projecting portion 61, of the front
side block 7 in the inner circumferential surface of the cylinder 9 and an elastic
seal member 55 is fitted in this groove 53. In the same manner, in the inner contact
projecting portion 63 of the rear side block 11, a groove 53 is formed in the outer
circumferential surface of the inner contact projecting portion 63 and an elastic
seal member 55 is fitted therein. Fig. 6B shows an example in which a triangular groove
53a is formed instead of the groove 53 having a rectangular cross-section.
[0060] Since it is possible to seal in intimate contact with the inner circumferential surface
of the cylinder 9 in the example in which the inner contact projecting portions 61
and 63 are formed in the side blocks 7 and 11, this is effective particularly in the
case where a sufficient seal space could not be obtained in the end face 9a of the
cylinder 9.
[0061] A third embodiment of the present invention will now be described.
[0062] A perspective view of a cylinder 70 of a gas compressor in accordance with the third
embodiment of the present invention is shown in Fig. 7. Note that, the same reference
numerals are used to indicate the same components as those shown in Figs. 1, 2, 9
and 10 and the explanation thereof will be omitted.
[0063] In Fig. 7, cylinder cutaway portions 39 and 39 are formed at positions opposite to
each other in the outer circumferential portion of the cylinder 70. The intake portions
41 and 41 penetrate in the longitudinal direction of the cylinder 70 and are opened
to both end faces 70a and 70a adjacent to the cylinder cutaway portions 39 and 39.
[0064] The seal member 51 is provided so as to surround the opening of the hollow portion
22 in the end face 70a of the cylinder 70, and in addition, seal members 71 and 71
are arranged integrally to surround the openings of the intake portions 41 and 41.
In the case where there is a sufficient space in the end face 70a, each seal member
51 and 71 may be provided separately. In the same manner, in the other end face that
will become the lower surface of the cylinder 70 in the drawing, the seal members
51 and 71 are arranged to surround the respective intake portions 41 and 41 of the
hollow portion 22.
[0065] Under this condition, the front side block 7 is brought into intimate contact with
the end face 70a of the cylinder 70 so that the hollow portion 22 and the intake portions
41 and 41 are sealed independently by the seal member 51 and the seal members 71 and
71, respectively.
[0066] It is possible to seal the intake portions 41 and 41 together with the seal of the
hollow portion 22 by both seal members 51 and 71. Accordingly, the gas leakage from
the hollow portion 22 is prevented. Also, it is possible to prevent the entrainment
to the intake portions 41 and 41 with respect to the gas leakage from the cylinder
cutaway portions 39 and 39. This also applies for the case in the rear side block
11 side.
[0067] A fourth embodiment of the present invention will now be described.
[0068] A perspective view of the front side block 7 of a gas compressor according to the
fourth embodiment of the present invention is shown in Fig. 8. The same reference
numerals are used to indicate the same components as those in Fig. 9 and the explanation
thereof will be omitted.
[0069] In Fig. 8, fitting projecting portions 73 and 73 are formed for fitting the cylinder
cutaway portions 39 and 39 of the cylinder 70 of Fig. 7 in the end face 7a of the
front side block 7. In the same manner, the two fitting projecting portions 73 and
73 are formed corresponding to the cylinder cutaway portions 39 and 39 in the rear
side block 11 (not shown).
[0070] The front side block 7 covers from above one of the end faces 70a of the cylinder
70 such that they come into intimate contact with each other and the fitting projecting
portions 73 and 73 of the front side block 7 are fitted with the cylinder cutaway
portions 39 and 39 opened to the end face 70a of the cylinder 70.
[0071] The gas leakage from the cylinder cutaway portions 39 and 39 is prevented by the
seal effect by the fitting projecting portions 73 and 73. Accordingly, it is possible
to prevent the entrainment from the cylinder cutaway portions 39 and 39 side to the
intake portions 41 and 41. This also applies for the case in the rear side block 11
side.
[0072] In this case, by using the fitting projecting portions 73 and 73 fitted in the cylinder
cutaway portions 39 and 39, the grooves may be formed in the circumferential direction
along the close contact portion on the outer circumferential surface at which the
cylinder 70 and the side blocks 7 and 11 are in intimate contact with each other.
The elastic seal member is fitted in the groove to thereby make it possible to form
the above-described outer circumferential seal of Fig. 4. It is possible to easily
seal the flow of the refrigerant gas from the high pressure region of the outer portion
of the cylinder 70 to the close contact portion by this outer seal.
[0073] Also, the seal members 71 and 71 for the intake portions 41 and 41 and the seal member
51 for the hollow portion 22 of Fig. 7 in accordance with the third embodiment are
used together so that the entrainment of the refrigerant gas due to the gas leakage
to the intake side may be further effectively prevented.
[0074] Thus, in the gas compressor in accordance with the present invention, the entrainment
of the refrigerant gas to the compression chambers 21 or the intake portions 41 and
41 is prevented to thereby make it possible to prevent the degradation of the volumetric
efficiency due to the resuction of the compressed gas and the degradation of the compressive
efficiency due to the elevation of the refrigerant gas.
[0075] Also, the mixture of the refrigerant gas accompanied with the increase of the heat
generation upon the compression is prevented to thereby make it possible to prevent
the oil film shortage or the like of the sliding portion due to the degradation in
viscosity of the lubricant oil.
[0076] Accordingly, in the gas compressor according to the present invention, it is possible
to enhance the compressor characteristics such as COP (that is an evaluation coefficient
representing the compressor ability by a ratio of the cooling ability to the power)
.
[0077] Note that, in Fig. 9, in order to prevent leakage of the refrigerant gas to the outside
of the gas compressor and entrainment of the refrigerant gas on the cylinder 9 side
to the intake chamber 23, a single O-ring 81 is embedded in the circumferential direction
in the groove surrounded by the rear cover 15, the front head 5 and the front side
block 7. Then, each surface portion of the front side block 7, the front head 5 and
the rear cover 15 contacting the O-ring 81 is machined with a high precision (surface
roughness of 6.3Z in terms of JIS ten point average roughness) for positively maintaining
the sealing performance with respect to the outside.
[0078] Thus, the cylinder 9, the front side block 7 and the rear side block 11 are formed
into the shell structure covered by the rear cover 15, and the sealing performance
with respect to the outside is maintained by means of only the O-ring 81 and each
surface portion of the front side block 7, the front head 5 and the rear cover 15
contacting with the O-ring 81.
[0079] For this reason, in the first embodiment to the fourth embodiment of the present
invention, it is unnecessary to consider the maintenance of the sealing performance
of the surface portions contacting with the seal members 51 and 71, the elastic seal
member 55 and the gasket 57. It is unnecessary to keep high precision. For example,
in Fig. 3C, the surface roughness of the surface portion 7a of the front side block
7 to be brought into contact with the right end face of the gasket 57 and the surface
portion 9a of the cylinder 9 to be brought into contact with the left end face of
the gasket 57 maybe 12.5Z in terms of JIS ten point average roughness.
[0080] Also, as shown in Fig. 6A, the machining of each surface of the circumferential walls
61a and 63a of the inner contact projecting portions 61 and 63 of the side blocks
7 and 11 and the inner wall 53b of the groove 53 having the rectangular cross-section
contacting with the elastic seal member 55 may be performed also at the surface roughness
of 12.5Z in terms of JIS ten point average roughness.
[0081] As described above, the machining of the metal surface portion that is to be brought
into contact with the seal member arranged in the shell structure internal portion
is easy and may be structured at low cost.
[0082] As described above, according to the present invention, since the seal means are
interposed between the end face of the cylinder and the two side blocks separately
for the hollow portion and the intake portions, it is possible to seal the hollow
portion of the cylinder and to positively separate the intake portions away from the
hollow portion side.
[0083] Therefore, in the gas compressor according to the present invention, it is possible
to suppress the gas leakage of the refrigerant gas medium to thereby enhance the compressor
characteristics such as volumetric efficiency.
1. A gas compressor comprising:
a cylinder having a hollow portion opened at both ends and in which at least one compression
chamber is formed in the hollow portion;
two side blocks in intimate contact with both end faces of the cylinder for sealing
both ends of the cylinder, respectively;
a rear cover for storing the side block and the cylinder; and
a first seal means interposed in a close contact portion in which at least one of
the two side blocks and the cylinder are brought into contact with each other,
wherein the first seal means is arranged so as to surround an opening of the hollow
portion.
2. A gas compressor comprising:
a cylinder having a hollow portion opened at both ends and in which at least one compression
chamber is formed in the hollow portion;
an intake portion having an opening formed at the end face of the cylinder for introducing
refrigerant gas to the compression chamber;
two side blocks in intimate contact with both end faces of the cylinder for sealing
both ends of the cylinder, respectively; and
a first seal means interposed in a close contact portion in which at least one of
the two side blocks and the cylinder are brought into intimate contact with each other,
wherein the first seal means surround the opening of the hollow portion and is
arranged at a position for separating the opening portion of the intake portion and
the opening of the hollow portion.
3. A gas compressor according to claim 2, wherein a second seal means for sealing and
surrounding the opening of the intake portion.
4. A gas compressor according to claim 1, wherein a cylinder cutaway portion for receiving
the refrigerant gas discharged from the compression chamber is formed in an outer
circumference of the cylinder and a fitting projecting portion for fitting the cylinder
cutaway portion is formed in at least one of the two side blocks.
5. A gas compressor according to claim 1, the gas compressor comprising in an inner contact
projecting portion for intimately contacting the inner circumferential surface of
the cylinder with at least one of the two side blocks,
wherein the first seal means is interposed in the close contact portion formed
between the inner contact projecting portion and the inner circumferential surface
of the cylinder.
6. A gas compressor according to claim 1, wherein the first seal means or the second
seal means is made of a elastic seal member and the elastic seal member is fitted
in a groove formed on one side of the two members facing each other at the close contact
portion.
7. A gas compressor according to claim 1, wherein the first seal means or the second
seal means is formed of a thin plate-like gasket.
8. A gas compressor comprising:
a cylinder having a hollow portion opened at both ends and in which at least one compression
chamber is formed in the hollow portion; and
two side blocks in intimate contact with both end faces of the cylinder for sealing
both ends of the cylinder, respectively,
wherein
a cylinder cutaway portion for receiving the refrigerant gas discharged from the
compression chamber is formed in a circumferential wall outer side portion of the
cylinder,
a fitting projecting portion for fitting the cylinder cutaway portion is formed
in at least one of the two side block,
a groove extending to the outer circumference of the fitting projecting portion
or its proximal end is formed circumferentially in an outer circumferential edge of
a close contact portion where the side block having the fitting projecting portion
and the cylinder are brought into intimate contact with each other, and
an elastic seal member is fitted in the groove.