U.S. patent application number 14/008150 was filed with the patent office on 2014-01-16 for scroll compressor.
This patent application is currently assigned to SANYO ELECTRIC CO., LTD.. The applicant listed for this patent is Akihiro Hayashi, Satoshi Iitsuka, Yasunori Kiyokawa, Tsutomu Kon, Kazuyoshi Sugimoto. Invention is credited to Akihiro Hayashi, Satoshi Iitsuka, Yasunori Kiyokawa, Tsutomu Kon, Kazuyoshi Sugimoto.
Application Number | 20140017107 14/008150 |
Document ID | / |
Family ID | 46929961 |
Filed Date | 2014-01-16 |
United States Patent
Application |
20140017107 |
Kind Code |
A1 |
Kon; Tsutomu ; et
al. |
January 16, 2014 |
SCROLL COMPRESSOR
Abstract
A scroll compressor which is capable of preventing thermal
damage to an O-ring and has a filter arrangement structure with
favorable installation work efficiency is provided. The compressor
is configured such that an intake pipe (50) for drawing in a
refrigerant gas through an external pipe (P) is securely joined to
a steel compressor casing (10) by penetrating therethrough, the
compressor casing housing a stationary scroll (22) and a swingable
scroll (24); and the lower end part of the intake pipe is fitted
into an intake portion (22K) with an O-ring (60) disposed
therebetween, the intake portion being provided in the stationary
scroll. The intake pipe is configured to have a steel iron pipe
body (54) on the intake portion side and a copper pipe body (52)
joined to the upper end part of the iron pipe body. The copper pipe
body of the intake pipe is silver-brazed (13) to the compressor
casing, and a filter (F) is installed in the intake pipe.
Inventors: |
Kon; Tsutomu; (Gunma-ken,
JP) ; Iitsuka; Satoshi; (Gunma-ken, JP) ;
Hayashi; Akihiro; (Gunma-ken, JP) ; Sugimoto;
Kazuyoshi; (Gunma-ken, JP) ; Kiyokawa; Yasunori;
(Gunma-ken, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Kon; Tsutomu
Iitsuka; Satoshi
Hayashi; Akihiro
Sugimoto; Kazuyoshi
Kiyokawa; Yasunori |
Gunma-ken
Gunma-ken
Gunma-ken
Gunma-ken
Gunma-ken |
|
JP
JP
JP
JP
JP |
|
|
Assignee: |
SANYO ELECTRIC CO., LTD.
Osaka
JP
|
Family ID: |
46929961 |
Appl. No.: |
14/008150 |
Filed: |
December 27, 2011 |
PCT Filed: |
December 27, 2011 |
PCT NO: |
PCT/JP2011/080590 |
371 Date: |
September 27, 2013 |
Current U.S.
Class: |
418/55.1 |
Current CPC
Class: |
F04C 2240/806 20130101;
F05C 2201/0421 20130101; F05C 2201/0448 20130101; F05C 2201/0475
20130101; F04C 18/0215 20130101; F04C 18/02 20130101; F04C 23/008
20130101 |
Class at
Publication: |
418/55.1 |
International
Class: |
F04C 18/02 20060101
F04C018/02 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 30, 2011 |
JP |
2011-075129 |
Claims
1. A scroll compressor in which an intake pipe for drawing in a
refrigerant gas through an external pipe is securely joined to a
steel compressor casing by penetrating therethrough, the compressor
casing being configured to house a stationary scroll and a
swingable scroll; and a lower end part of the intake pipe is fitted
into an intake portion with an O-ring disposed therebetween, the
intake portion being provided in the stationary scroll, the scroll
compressor being characterized in that the intake pipe is
configured to have a steel iron pipe body on the intake portion
side and a copper pipe body joined to an upper end part of the iron
pipe body, the copper pipe body being made of copper or another
metal a surface of which is plated with copper; the copper pipe
body of the intake pipe is silver-brazed to the compressor casing;
and a filter for removing dust mixed in the refrigerant gas is
installed in the intake pipe.
2. A scroll compressor in which an intake pipe for drawing in a
refrigerant gas through an external pipe is securely joined to a
steel compressor casing by penetrating therethrough, the compressor
casing being configured to house a stationary scroll and a
swingable scroll; and a lower end part of the intake pipe is fitted
into an intake portion with an O-ring disposed therebetween, the
intake portion being provided in the stationary scroll, the scroll
compressor being characterized in that the intake pipe is
configured to have a steel iron pipe body on the intake portion
side and a copper pipe body joined to an upper end part of the iron
pipe body, the copper pipe body being made of copper or another
metal a surface of which is plated with copper; the copper pipe
body of the intake pipe is silver-brazed to the compressor casing;
a stepped portion which has an inner diameter equal to or less than
the minimum inner diameter of the copper pipe body and which is
opened toward the copper pipe body is provided inside the iron pipe
body; and an opening edge portion of a filter for removing dust
mixed in the refrigerant gas has an outer diameter which allows for
passing through a region of the minimum inner diameter, with the
opening edge portion of the filter press-fitted into the stepped
portion.
3. The scroll compressor according to claim 1, wherein the filter
is formed by soldering.
4. The scroll compressor according to claim 2, wherein the filter
is a mesh of thin metal wire, and the opening edge portion is
formed by securely caulking a region into which the opening edge
portion of the body of the filter is outwardly turned over.
5. A scroll compressor in which an intake pipe for drawing in a
refrigerant gas through an external pipe is securely joined to a
steel compressor casing by penetrating therethrough, the compressor
casing being configured to house a stationary scroll and a
swingable scroll; and a lower end part of the intake pipe is fitted
into an intake portion with an O-ring disposed therebetween, the
intake portion being provided in the stationary scroll, the scroll
compressor being characterized in that the intake pipe is
configured to have a steel iron pipe body on the intake portion
side and a copper pipe body joined to the upper end part of the
iron pipe body, the copper pipe body being made of copper or
another metal the surface of which is plated with copper; the
copper pipe body of the intake pipe is silver-brazed to the
compressor casing; and an opening edge portion of a filter for
removing dust mixed in the refrigerant gas is sandwiched between
the iron pipe body and the copper pipe body in a joint area
thereof
6. The scroll compressor according to claim 2, wherein the filter
is formed by soldering.
Description
TECHNICAL FIELD
[0001] The present invention relates to a scroll type compressor
which is provided in an intake pipe with a filter for removing dust
mixed possibly in a refrigerant gas flowing through a refrigerant,
gas pipe, the intake pipe being connected to the refrigerant gas
pipe from an evaporator in a refrigeration cycle so as to draw in
the refrigerant gas.
BACKGROUND ART
[0002] Scroll type compressors are available as a compressor for
drawing in and compressing a refrigerant gas flowing through a
refrigerant gas pipe from an evaporator in a refrigeration cycle.
As this scroll type compressor, disclosed in Patent Literature 1
listed below is a structure in which an intake pipe 51 made of an
integrated material is joined to an end cap 4A which is a part of a
compressor casing. Furthermore, the top part of the intake pipe 51
is fitted into an inlet 18 of a stationary scroll 12 with an O-ring
disposed therebetween for preventing leakage of the refrigerant
gas. Note that the integrated material is typically considered to
be steel. Furthermore, disclosed in Patent Literature 2 is an air
filter for scroll-type fluid machinery.
PRIOR ART DOCUMENT
Patent Literature
[0003] Patent Literature 1: Japanese Patent Application Laid-Open
No. 2009-228439
[0004] Patent Literature 2: Japanese Patent Application Laid-Open
No. 2008-267142
SUMMARY OF INVENTION
Problems to be Solved by Invention
[0005] However, when the intake pipe is made of steel as disclosed.
in Patent Literature 1 and is welded to the end cap made of steel,
welding heat may cause thermal damage to the O-ring. Furthermore,
in the refrigeration cycle, as disclosed in Patent. Literature 2
above, it is necessary to install a filler somewhere in the
refrigerant, piping circuit in order to remove dust in the
refrigerant gas. It would be preferable to be capable of placing
this filter by efficient work.
[0006] It is therefore an object of the invention to solve the
problem by providing a scroll compressor which is capable of
preventing thermal. damage to an O-ring and which has a filter
arrangement structure with favorable installation work
efficiency.
Means for Solving Problems
[0007] In view of the aforementioned problem, the first invention
provides a scroll compressor in which an intake pipe for drawing in
a refrigerant gas through an external pipe is securely joined to a
steel compressor casing by penetrating therethrough, the compressor
casing being configured to house a stationary scroll and a
swingable scroll; and the lower end part of the intake pipe is
fitted into an intake portion with an O-ring disposed therebetween,
the intake portion being provided in the stationary scroll. The
scroll compressor is characterized in that the intake pipe is
configured to have a steel iron pipe body on the intake portion
side and a copper pipe body joined to the upper end part of the
iron pipe body, the copper pipe body being made of copper or
another metal the surface of which is plated with copper; the
copper pipe body of the intake pipe is silver-brazed to the
compressor casing; and a filter for removing dust mixed in the
refrigerant gas is installed in the intake pipe.
[0008] The second invention, an aspect of the first invention,
provides a scroll compressor An which an intake pipe for drawing in
a refrigerant gas through an external pipe is securely joined to a
steel compressor casing by penetrating therethrough, the compressor
casing being configured to house a stationary scroll and a
swingable scroll; and the lower end part of the intake pipe is
fitted into an intake portion with an O-ring disposed.
therebetween, the intake portion being provided in the stationary
scroll. The scroll compressor is characterized in that the intake
pipe is configured to have a steel iron pipe body on the intake
portion side and a copper pipe body joined to the upper end part of
the iron pipe body, the copper pipe body being made of copper or
another metal the surface of which is plated. with copper; the
copper pipe body of the intake pipe is silver-brazed to the
compressor easing; a stepped portion which has an inner diameter
equal to or less than the minimum inner diameter of the copper pipe
body and which is opened toward the copper pipe body is provided
inside the iron pipe body; and the opening edge portion of a filter
for removing dust mixed in the refrigerant gas has an outer
diameter which allows for passing through a region of the minimum
inner diameter, with the opening edge portion of the filter
press-fitted into the stepped portion.
[0009] The third invention is configured such that the filter of
the first or second invention is formed by soldering.
[0010] A fourth invention is configured such that the filter of the
first or second invention is a mesh of thin metal wire, and the
opening edge portion is formed by securely caulking a region into
which the opening edge portion of the body of the filter is
outwardly turned over.
[0011] The fifth invention, an aspect of the first invention,
provides a scroll compressor in which an intake pipe for drawing in
a refrigerant gas through an external pipe is securely joined to a
steel compressor casing by penetrating therethrough, the compressor
casing being configured to house a stationary scroll and a
swingable scroll; and the lower end part of the intake pipe is
fitted into an intake portion with an O-ring disposed therebetween,
the intake portion being provided in the stationary scroll. The
scroll compressor is characterized in that the intake pipe is
configured to have a steel iron pipe body on the intake portion
side and a copper pipe body joined to the upper end part of the
iron pipe body, the copper pipe body being made of copper or
another metal the surface of which is plated with copper; the
copper pipe body of the intake pipe is silver-brazed to the
compressor casing; and the opening edge portion of a filter for
removing dust mixed in the refrigerant gas is sandwiched between
the iron pipe body and the copper pipe body in a joint area
thereof.
EFFECTS OF INVENTION
[0012] In the first invention, the intake pipe is configured to
have an iron pipe body as the lower side and a copper pipe body as
the upper side, with the copper pipe body silver-brazed to the
steel compressor casing. Thus, heat generated during the silver
brazing can be made lower in temperature than heat produced during
welding. It is thus possible to prevent thermal damage to the
O-ring even during fabrication/manufacture with the O-ring
pre-mounted on the intake pipe. Furthermore, since the intake pipe
is formed of two parts, i.e., the iron pipe body and the copper
pipe body, it is possible to install the filter in the intake pipe
as a passing work when these two parts are joined together to form
the intake pipe. That is, the filter can be installed with
favorable work efficiency.
[0013] In the second invention, the intake pipe is configured to
have an iron pipe body as the lower side and a copper pipe body as
the upper side, with the copper pipe body silver-brazed to the
steel compressor casing. Thus, heat generated during the silver
brazing can be made lower in temperature than heat produced during
welding. It is thus possible to prevent thermal damage to the
O-ring even during fabrication/manufacture with the O-ring
pre-mounted on the intake pipe. Furthermore, since the intake pipe
is formed of two parts, i.e., the iron pipe body and the copper
pipe body, it is possible to provide a stepped portion inside the
iron pipe body when the intake pipe is in the form of parts. Since
the inner diameter of the stepped portion is equal to or less than
the minimum inner diameter of the copper pipe body, the iron pipe
body and the copper pipe body can he joined together and
thereafter, the filter can be inserted from the copper pipe body
side (from above) so as to press fit the opening edge portion into
the stepped portion. Thus, forming the intake pipe of the two parts
makes it possible to facilitate installation of the filter as a
passing work, i.e., with favorable installation work
efficiency.
[0014] In the third invention, the filter is formed by soldering.
The filter can be press fitted after the iron pipe body and the
copper pipe body are joined together as well as the copper pipe
body of the intake pipe is silver-brazed to the compressor casing.
It is thus possible to prevent the filter from being subjected to
heat produced during joining each portion together. This also
prevents the solder from being melted and thermal damage to the
filter.
[0015] In the fourth invention, the filter is a mesh of thin metal
wire. The filter can be press fitted. after the iron pipe body and
the copper pipe body are joined together as well as the copper pipe
body of the intake pipe is silver-brazed to the compressor casing.
It is thus possible to prevent the filter from being subjected to
heat produced during joining each portion together. This also
prevents thermal damage to the thin metal wire, that is, the
filter.
[0016] In the fifth invention, the intake pipe is configured to
have an iron pipe body as the lower side and a copper pipe body as
the upper side, with the copper pipe body silver-brazed to the
steel compressor casing. Thus, heat generated during the silver
brazing can be made lower in temperature than heat produced during
welding. It is thus possible to prevent thermal damage to the
O-ring even during fabrication/manufacture with the O-ring
pre-mounted on the intake pipe. Furthermore, since the. intake pipe
is formed of two parts, i.e., the iron pipe body and the copper
pipe body, the opening edge portion of the filter can be sandwiched
between the iron pipe body and the copper pipe body in the joint
area thereof by a passing work when these two parts are joined
together to form the intake pipe. Thus, the filter can be installed
with favorable installation work efficiency.
BRIEF DESCRIPTION OF DRAWINGS
[0017] FIG. 1 is a longitudinal sectional view illustrating a
scroll compressor according to the present invention.
[0018] FIG. 2 is an enlarged view illustrating a main portion of
the scroll compressor of FIG. 1.
[0019] FIG. 3 is a further enlarged longitudinal sectional view
illustrating the main portion of FIG. 2.
[0020] FIG. 4 is a longitudinal sectional view illustrating a
modified embodiment of FIG. 3.
DESCRIPTION OF EMBODIMENTS
[0021] Now, the present invention will be described in more detail
with reference to the accompanying drawings. First, reference will
be made to FIG. 1. Scroll type compressors are connected to a
refrigerant gas pipe P from an evaporator in a refrigerant circuit
(not shown) through which a refrigerant circulates to perform a
refrigeration cycle operation, and are configured to compress a
refrigerant gas. This compressor has a compressor casing 10 which
is of a hermetically sealed dome type with a vertically elongated
cylindrical shape. The compressor casing 10, which is constructed
as a pressure vessel, is made up of a casing body 12 being a
cylindrical barrel section that has an axial line extending in the
vertical direction; an upper end cap 14 which is integrally welded
thereto so as to hermetically seal the upper end thereof and which
is bowl-shaped to be protruded upwardly; and a lower end cap
(bottom) 16 which is integrally welded to the casing body 12 so as
to hermetically seal the lower end thereof and which is bowl-shaped
to be protruded downwardly.
[0022] Housed inside the compressor casing 10 are a scroll type
compression mechanism 20 for compressing the refrigerant gas; and a
driving motor 30 which is disposed below the scroll type
compression mechanism 20. The scroll type compression mechanism 20
and the driving motor 30 are coupled to each other by means of a
driving shaft 36 which extends in the vertical direction within the
compressor casing 10 and serves as the output shaft of the driving
motor 30. There is also formed a high-pressure space KK between the
scroll type compression mechanism 20 and the driving motor 30.
[0023] The scroll type compression mechanism 20 includes an annular
main frame 40; a stationary scroll 22 disposed in close contact
with the upper surface of the main frame 40; and a swingable scroll
24 disposed between the stationary scroll 22 and the main frame 40
so as to be swingingly engaged with the stationary scroll 22. The
main frame 40 is secured, on the entire outer peripheral surface
thereof, to the casing body 12. Furthermore, the main frame 40
divides inside the compressor casing 10 into the high-pressure
space KK below the main frame 40 and a discharge space TK above the
main frame 40. The spaces KK and TK are in communication with each
other via a vertical groove N which is formed to vertically extend
through each of the circumferential portions of the main frame 40
and the stationary scroll 22. The refrigerant gas compressed with
the scroll type compressor 20 to a high pressure flows sequentially
through the discharge space TK, the vertical groove N, and the
high-pressure space KK.
[0024] The main frame 40 has, at the center of the lower surface, a
bearing unit 40T which bears the driving shaft 36 rotatably on a
radial bearing 39 and is protruded downwardly. Furthermore, the
driving shaft 36 is integrally provided, on the upper end, with an
eccentric shaft portion 38 which has a center axis line that is
decentered from the center axis line of the driving shaft 36. The
eccentric shaft portion 38 is inserted into a cylindrical. boss
portion 24B, which is protruded downwardly at the center of the
lower, surface of an end plate 24A of the swingable scroll 24,
allowing the eccentric shaft portion 38 and the boss portion 24B to
be relatively rotatable. The main frame 40 is provided with a space
40H which is formed above and in communication with the hole of the
bearing unit 40T, the space 40H allowing the boss portion 24B of
the swingable scroll 24 having received the eccentric shaft portion
38 to be rotatable. Below the driving motor 30, there is provided a
bearing plate 41 which allows the lower end part of the driving
shaft 36 to be rotatably fitted therein and thereby supported.
[0025] Furthermore, as already mentioned above, at a predetermined
position of the upper end cap 14 of the compressor casing 10, there
is provided a tubular steel mount pipe 14Z which is welded thereto
so as to pierce therethrough with the center axis line oriented in
the vertical direction. As will be described in more detail later,
there is securely provided an intake pipe 50 which passes through
the mount pipe 14Z, the intake pipe 50 being adapted to draw the
refrigerant gas from the refrigerant gas pipe P of the refrigerant
circuit into the scroll type compression mechanism 20. Furthermore,
the casing body 12 is provided hermetically with a discharge pipe
70 which discharges the refrigerant gas in the high-pressure space
KK inside the compressor casing 10 out of the compressor casing 10
and which is secured to the casing body 12 so as to penetrate
therethrough. The intake pipe 50 extends through the discharge
space TK in the vertical direction, and the lower end part thereof
is fitted into an intake portion 22K with an O-ring 60 disposed
therebetween, the intake portion 22K being provided in an end plate
22A of the stationary scroll 22. Furthermore, the intake portion
22K is in communication with a hole portion 2211 that penetrates
the end plate 22A in such a manner as to feed the refrigerant gas
into a compression chamber 26 that is defined by a lap 22R of the
stationary scroll 22 and a lap 24R of the swingable scroll 24. In
this mariner, the refrigerant gas is drawn into the. compression
chamber 26.
[0026] In this example, the driving motor 30 is an
alternating-current motor which includes an annular stator 32
secured to the inner wall surface of the compressor casing 10 and a
rotor 34 rotatably disposed inside the stator 32, with the
aforementioned driving shaft 36 secured to the rotor 34. When being
rotated, the driving shaft 36 causes the eccentric shaft portion 38
to be rotated, thereby driving the aforementioned swingable scroll
24, When the swingable scroll 24 is driven, the swingable scroll 24
is pivoted (swung) while being restricted from rotating around its
own axis, due to the operation of a known Oldham. ring 28. The
pivotal motion is produced in a circle, n with the radius being the
amount of the eccentricity of the eccentric shaft: portion 38
relative to the driving shaft 36.
[0027] There is a lower space UK which is located below the driving
motor 30 and kept at a high pressure, and some oil is stored in the
inner bottom portion of the lower end cap 16 that defines the lower
space UK. There is formed an oil feeding passage 80 as part of
high-pressure oil feeding means within the driving shaft 36, and
the oil feeding passage 80 is in communication with an oil chamber
80KK on the lower surface of the end plate 24A of the swingable
scroll 24. The driving shaft 36 is provided with a pickup (not
shown) which is linked to the lower end so as to pick up the oil
stored in the inner bottom. portion of the lower end cap 16. The
picked-up oil is supplied to the oil, chamber 80KK below the
swingable scroll 24 through the oil feeding passage 80 in the
driving shaft 36, and then. supplied from the oil chamber 80KK to
each sliding portion of the scroll type compression mechanism 20
and the compression chamber 26 through a communication passage 24AR
that is provided in the swingable scroll 24.
[0028] The stationary scroll 22 has the end plate 22A and the
aforementioned spiral, i.e., involute lap 22R which is formed on
the lower surface of the end plate 22A. On the other hand, the
swingable scroll 24 has the end plate 24A and the aforementioned
spiral, i.e., involute lap 24R which is formed on the upper surface
of the end plate 24A, Further, the lap 22R of the stationary scroll
22 and the lap 24R of the swingable scroll 24 are opposed so as to
be swingingly engaged with each other, whereby both the laps 22R
and 24R form three or an appropriate number of compress. on
chambers 26 between the stationary scroll 22 and the swingable
scroll 24.
[0029] The driving shaft 36 located below the bearing unit 40T of
the main frame 40 is provided with a balance weight 37 for
maintaining dynamic balance with the swingable scroll 24 or the
eccentric shaft portion 38 or the like, so that the swingable
scroll 24 is pivoted without being rotated around its own axis
while balance is being maintained with the balance weight 31.
Further, the compression chamber 26 is configured to compress the
refrigerant gas drawn in through the intake pipe 50 to a higher
pressure by contracting the volume between both the laps 22R and
24R toward the center of the stationary scroll 22 as the swingable
scroll 24 is pivoted.
[0030] The stationary scroll 22 is provided at the center with a
discharge hole TP. The high-pressure refrigerant gas discharged
from the discharge hole TP is discharged into the discharge space
TK through the discharge valve 42. Then, as described above, the
high-pressure refrigerant gas flows into the high-pressure space KK
below the main frame 40 through the aforementioned vertical groove
M which is provided. in each outer circumferential portion of the
main frame 40 and the stationary scroll 22. Then, the high-pressure
refrigerant gas is discharged out of the compressor casing 10
through the discharge pipe 70 provided on the casing body 12.
[0031] Now, reference will be made to FIG. 2 showing an enlarged
view of the upper end cap 14 and the intake pipe 50 of the scroll
type compressor described above and to FIG. 3 showing an enlarged
view of the intake pipe 50. First, an iron pipe body 54 made of
steel in an appropriate length and a copper pipe body 52 made of
copper or another metal such as steel plated with copper in an
appropriate length were prepared for the intake pipe 50. The copper
pipe body 52 is less in thickness than the iron pipe body 54. The
copper pipe body of this example is half or less in thickness than
the iron pipe body 54. The iron pipe body 54 is provided on the
lower outer circumference with an annular groove 54M along which
the O-ring 60 is installed, and the lower end outer circumferential
portion is formed into a tapered. guide portion 54G. The intake
portion 22K provided in the end plate 22A of the stationary scroll
22 on the main body side of the scroll type compressor is formed
into a guide portion with the inlet edge portion increased in
diameter toward the top (upwardly), so that this guide portion and
the above-mentioned guide portion 54G facilitate insertion of the
intake pipe 50 into the intake portion 22K.
[0032] Furthermore, the inner periphery of a joint area 54A which
is the upper end part of the iron pipe body 54 is provided with an
upwardly-opened first stepped portion 54D', into which a joint area
52A of the lower end part of the copper pipe body 52 is fitted and
to which the joint area 52A is silver-brazed with a silver braze
Y2. Furthermore, immediately below the first stepped portion 54D',
there is provided a second stepped portion 54D which is opened
(upwardly) toward the copper pipe body 52. The inner diameter D2 of
the second stepped portion 54D is equal to or less than the minimum
inner diameter Di of the copper pipe body 52.
[0033] On the other hand, the outer diameter of an inlet opening
edge portion FA of a basket-like filter F (the maximum outer
diameter of the filter F) for removing dust mixed in the
refrigerant gas is sized to be capable of passing through a region
of the minimum inner diameter D1 of the copper pipe body 52 as well
as being press-fitted into the second stepped portion 54D. FIG. 3
is a view showing the press-fitted filter F. The filter F of this
example is formed of a mesh of thin stainless steel wire, so that
the inlet opening edge portion FA is formed by a turnover of the
mesh being caulked.
[0034] However, a filter F according to another embodiment is also
available. For example, as the inlet opening edge portion FA, it is
also acceptable to employ a stainless-steel annular plate and
solder this plate to an appropriate filter body. On the other hand,
to obtain the appropriate filter body, it is acceptable to solder a
plurality of filter body elements divided in the circumferential
direction so as to join the elements together.
[0035] As described above, the structure in which the filter F is
press-fitted allows the filter F to be inserted and press-fitted
into the intake pipe 50 after each part has been joined together.
Thus, even in the case of the filter F provided by soldering, the
problem with the solder being melted can be prevented. Furthermore,
even in the case of the filter F made of a wire material reduced in
diameter, the thermal damage to the wire material can be prevented.
After such a filter F has been placed, the upper end part of the
copper pipe body 52 is copper-brazed to the refrigerant gas pipe
P.
[0036] Furthermore, even in the case of the filter F having the
inlet opening edge portion FA the size of which is greater than the
maximum outer diameter of the filter F of FIG. 3, the inlet opening
edge portion FA can be installed by being sandwiched between the
lower end bottom surface of the first stepped portion 54D' and the
lower end of the copper pipe body 52, i.e., the lower end of the
joint area 52A. In this case, the inlet opening edge portion FA is
preferably formed in the shape of a so-called flange that is
expanded sideward, which would facilitate sandwiching of the inlet
opening edge portion FA. For the installation by sandwiching, the
inlet opening edge portion FA needs to be sandwiched before being
silver-brazed with the silver braze Y2. Thus, the filter F
requiring no soldering would be preferable.
[0037] According to the present invention, it is able to save the
trouble of providing in a prescribed manner such a filter F into
another pipe such as the refrigerant gas pipe P.
[0038] As another embodiment for press-fitting the opening edge
portion FA of the filter F into the stepped portion, there is also
available an embodiment of FIG. 4 which is different from that of
FIG. 3. That is, the joint area 52A or the lower end part of the
copper pipe body 52 is fitted into and silver-brazed with the
silver braze Y2 to the first stepped portion 54D' of the iron pipe
body 54, in the case of which the size of the step of the first
stepped portion 54D' is greater by an appropriate size than the
thickness of the joint area 52A. The filter F is press-fitted so
that the opening edge portion FA is placed on the step surface that
remains inward of the joint area 52A. The matters in the embodiment
of FIG. 4 are the same as described in relation to the embodiment
of FIG. 3 except that the opening edge portion FA is press fitted
not into the second stepped portion 540 but into the first, step
portion 54D'.
[0039] On the other hand, in this embodiment, the steel mount pipe
14Z is welded to the steel upper end cap 14 by arc welding as
described above (the built-up portion denoted by reference number
Y1). The intake pipe 50 is fitted into the mount pipe 14Z, so that
the fitted portion of the copper pipe body 52 is silver-brazed with
a silver braze Y3 to the mount pipe 14Z. Thus, the upper end cap
assembly is formed. Since this allows the O-ring 60 to remain
detached while the intake pipe 50 is being securely joined to the
upper end cap 14, it is possible to prevent thermal. damage to the
O-ring caused by heat. produced during the joining work. However,
according to the present invention, not the aforementioned sequence
of manufacture/fabrication but the following one may he employed.
That is, the intake pipe 50 may be fabricated in a manner such that
the lower end part thereof is fitted into the intake portion 22K
provided in the end. plate 22A of the stationary scroll 22 with the
O-ring 60 disposed therebetween; after that, the upper part of the
intake e pipe 50 is passed through the mount pipe 14Z welded to the
upper end cap 14; and then the fitted portion of the copper pipe
body 52 is silver-brazed thereto with the silver braze Y3. In this
case, since the copper pipe body 52 is employed, the silver brazing
Y3 can be performed at a temperature lower than that for the arc
welding, and thus thermal damage to the O-ring 60 can also he
prevented or reduced.
[0040] Furthermore, a stepped portion 14D having a step bottom
surface 14S is formed on the outer side of the peripheral lower end
part of the upper end cap 14, so that the stepped portion 14D is
fitted into the upper end part of the casing body 12 and then arc
welded thereto (reference number Y4 of FIG. 1).
INDUSTRIAL APPLICABILITY
[0041] The present invention is applicable to the scroll type
compressor.
DESCRIPTION OF REFERENCE NUMERALS
[0042] 10 compressor casing [0043] 12 casing body [0044] 14 upper
end cap [0045] 14D stepped portion [0046] 14Z mount pipe [0047] 22
stationary scroll [0048] 22K intake portion [0049] 24 swingable
scroll [0050] 50 intake pipe [0051] 52 copper pipe body [0052] 52A
joint area [0053] 54 iron pipe body [0054] 54A joint area [0055]
54D stepped portion [0056] 60 O-ring [0057] D1 minimum inner
diameter of copper pipe body [0058] F filter [0059] FA inlet
opening edge portion [0060] Y1, Y4 arc welded portion [0061] Y2, Y3
silver-brazed portion
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