Information
-
Patent Grant
-
6688856
-
Patent Number
6,688,856
-
Date Filed
Monday, February 4, 200222 years ago
-
Date Issued
Tuesday, February 10, 200420 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
- Wenderoth, Lind & Ponack, L.L.P.
-
CPC
-
US Classifications
Field of Search
US
- 417 363
- 417 312
- 417 902
- 181 403
- 181 229
- 062 296
-
International Classifications
-
Abstract
A closed motor-driven compressor includes a compression component (2) and an electric component (3) for driving the compression component (2), both of which are elastically supported within a closed vessel (1). A suction muffler (8) is mounted on the compression component (2) and includes a plurality of elements (10, 11, 12; 14, 15, 16; 18, 19, 20; 22, 23, 24; 26, 27, 28) assembled together and each made of synthetic resin. One of the plurality of elements (10, 11, 12; 14, 15, 16; 18, 19, 20; 22, 23, 24; 26, 27, 28) has a guide rib (13; 17; 21) integrally formed therewith that is tapered down toward an adjoining one of the plurality of elements (10, 11, 12; 14, 15, 16; 18, 19, 20; 22, 23, 24; 26, 27, 28), thereby facilitating assembly of the two elements.
Description
TECHNICAL FIELD
The present invention relates to a closed motor-driven compressor for use in refrigerators, air conditioners or the like.
BACKGROUND ART
Recently, closed motor-driven compressors are demanded to have a high energy efficiency, and it is well known that a suction muffler having a low thermal conductivity and made of, for example, synthetic resin is suited for use in such compressors.
Japanese Laid-Open Patent Publication (unexamined) No. 10-47248 discloses a closed motor-driven compressor as shown in
FIGS. 11 and 12
. This compressor includes a compression component
2
and an electric component
3
, both elastically supported within a closed vessel
1
. The compression component
2
includes a cylinder
4
, a piston
5
reciprocatingly accommodated in the cylinder
4
, a valve plate
6
mounted on the cylinder
4
so as to cover an opening defined therein, and a cylinder head
7
secured to the cylinder
4
. A suction muffler
8
′ made of synthetic resin and made up of three elements is mounted on the cylinder head
7
for introducing a refrigerant gas into the cylinder
4
. The suction muffler
8
′ is connected to a suction pipe
9
extending through a side wall of the closed vessel
1
to introduce the refrigerant gas into the closed vessel
1
.
As shown in
FIG. 13
, the muffler
8
′ includes a first element
29
, a second element
30
to which the first element
29
is secured, and a third element
31
secured to the second element
30
. As shown in
FIG. 14
, the first element
29
has an inwardly protruding guide rib
32
integrally formed therewith. The guide rib
32
acts to facilitate the assembling of the first and second elements
29
,
30
. After the first and second elements
29
,
30
have been assembled using the guide rib
32
, they are assembled with the third element
31
, and all of them are joined together by ultrasonic welding.
In the closed motor-driven compressor of the above-described construction, the refrigerant gas from the low-pressure side in a refrigerating cycle is introduced into the closed vessel
1
through the suction pipe
9
and then into the cylinder
4
through the suction muffler
8
′ before the refrigerant gas is compressed by the piston
5
.
In the above-described construction, however, because the suction muffler
8
′ is made of synthetic resin, it is apt to be deformed after injection molding. Accordingly, a difficulty is encountered in assembling the first and second elements
29
,
30
with the use of the guide rib
32
.
U.S. Pat. No. 5,341,654 discloses a refrigeration compressor, wherein V-shaped ribs extend laterally across respective flange portions as well as a tubular member adjacent the opposite ends of the flange portions of a muffler, which is fabricated from a polymeric composition.
The present invention has been developed to overcome the above-described disadvantages.
It is accordingly an objective of the present invention to provide a closed motor-driven compressor having an improved suction muffler that facilitates the assembly of its elements.
DISCLOSURE OF THE INVENTION
In accomplishing the above and other objectives, the closed motor-driven compressor according to the present invention includes a closed vessel, a compression component elastically supported within the closed vessel, an electric component elastically supported within the closed vessel for driving the compression component, and a suction muffler mounted on the compression component and including a plurality of elements assembled together and each made of synthetic resin. One (first element) of the plurality of elements has a guide rib integrally formed therewith that is tapered down toward an adjoining one (second element) of the plurality of elements. The tapered guide rib acts to reform deformation of the second element into which it is inserted, thus facilitating an assembly of the first and second elements.
The guide rib is formed discontinuously or intermittently along a peripheral edge of the first element. By so doing, strains caused by the cooling of the first element after injection molding are relatively small, thus reducing deformation of the first element.
The first element may have first and second peripheral portions and third and fourth peripheral portions each interposed between the first and second peripheral portions, wherein the first and second peripheral portions have first and second radii of curvature, respectively, while the third and fourth peripheral portions have third and fourth radii of curvature, respectively, that are smaller than the first and second radii of curvature, and wherein the guide rib is formed at the third or fourth peripheral portion and at the first and second peripheral portions adjacent thereto.
In assembling the first and second elements, the first and second portions of the second element having large radii of curvature are subjected to relatively small deformation, while the third and fourth portions of the second element having small radii of curvature are subjected to larger deformation. Accordingly, the guide rib formed at the first and second peripheral portions of the first element can be readily inserted into the corresponding portions of the second element, and the guide rib gradually reforms the deformation of the second element. Such insertion facilitates subsequent insertion of the guide rib into the third and fourth portions of the second element, making it possible to realize automated assembling of suction mufflers.
The plurality of elements are secured to one another by welding. The welding reduces a leakage of suction gas from the suction muffler.
Alternatively, the plurality of elements are secured to one another by fastening means such, for example, as rivets, screws, or the like. The use of such fastening means requires no expensive welding machine or the like.
Again alternatively, the plurality of elements are secured to one another by introducing projections formed therewith into openings defined therein. The assembling of the elements by engagement of the projections with the openings requires no fastening means referred to above.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objectives and features of the present invention will become more apparent from the following description of preferred embodiments thereof with reference to the accompanying drawings, throughout which like parts are designated by like reference numerals, and wherein:
FIG. 1
is a top plan view of a closed motor-driven compressor according to the present invention with a closed vessel partially removed;
FIG. 2
is a vertical sectional view of the closed motor-driven compressor of
FIG. 1
;
FIG. 3
is an exploded view of a suction muffler mounted in the closed motor-driven compressor of
FIG. 1
;
FIG. 4
is an enlarged cross-sectional view of a portion A in
FIG. 3
;
FIG. 5
is a view similar to
FIG. 3
, but depicting a modification thereof;
FIG. 6
is a view similar to
FIG. 3
, but depicting another modification thereof;
FIG. 7
is a front view of one of a plurality of elements constituting the suction muffler of
FIG. 6
;
FIG. 8
is a bottom plan view of the element of
FIG. 7
;
FIG. 9
is a view similar to
FIG. 3
, but depicting a further modification thereof;
FIG. 10
is a view similar to
FIG. 3
, but depicting a still further modification thereof;
FIG. 11
is a top plan view of a conventional closed motor-driven compressor with a closed vessel partially removed;
FIG. 12
is a vertical sectional view of the closed motor-driven compressor of
FIG. 11
;
FIG. 13
is an exploded view of a suction muffler mounted in the closed motor-driven compressor of
FIG. 11
; and
FIG. 14
is an enlarged cross-sectional view of a portion A in FIG.
13
.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
This application is based on application No. 11-147955 filed May 27, 1999 in Japan, the content of which is incorporated hereinto by reference.
Referring now to the drawings, there is shown in
FIGS. 1 and 2
a closed motor-driven compressor embodying the present invention. The compressor shown therein includes a compression component
2
and an electric component
3
for driving the compression component
2
, both of which are elastically supported within a closed vessel
1
. The compression component
2
includes a cylinder
4
, a piston
5
reciprocatingly accommodated in the cylinder
4
, a valve plate
6
mounted on the cylinder
4
so as to cover an opening defined therein, and a cylinder head
7
secured to the cylinder
4
. A suction muffler
8
is mounted on the cylinder head
7
for introducing a refrigerant gas into the cylinder
4
. The suction muffler
8
is made of synthetic resin and includes three elements assembled together. The suction muffler
8
is connected to a suction pipe
9
extending through a side wall of the closed vessel
1
to introduce the refrigerant gas into the closed vessel
1
.
As shown in
FIG. 3
, the suction muffler
8
includes a first element
10
, a second element
11
to which the first element
10
is secured, for example, by welding, and a third element
12
secured to the second element
11
, for example, by welding. The welding reduces a leakage of suction gas from the suction muffler
8
. Each of the first to third elements
10
,
11
,
12
is injection-molded from polybutylene terephthalate (PBT).
As shown in
FIG. 4
, the first element
10
has an inwardly or downwardly protruding guide rib
13
integrally formed therewith. The guide rib
13
is formed continuously along the peripheral edge of the first element
10
and is tapered down inwardly or downwardly. More specifically, the inner surface of the guide rib
13
extends substantially straight in the vertical direction, while the outer surface of the guide rib
13
is inclined such that the thickness of the guide rib
13
gradually decreases inwardly or downwardly.
By the above-described construction, in assembling the first and second elements
10
,
11
, the guide rib
13
of the first element
10
reforms deformation of the second element
11
. Accordingly, the first and second elements
10
,
11
can be assembled together merely by inserting the guide rib
13
into an associated end portion of the second element
11
, thus facilitating the assembling work.
FIG. 5
depicts a modification
8
A of the suction muffler
8
shown in FIG.
3
.
This suction muffler
8
A includes first to third elements
14
,
15
,
16
assembled together, just like the suction muffler
8
. The suction muffler
8
A, however, differs from the suction muffler
8
in that the first element
14
has an inwardly or downwardly protruding guide rib
17
that is formed discontinuously along the peripheral edge of the first element
14
.
Because the tapered guide rib
17
is formed intermittently along the peripheral edge of the first element
14
, strains caused by the cooling of the first element
14
after the injection molding are relatively small, thus reducing deformation of the first element
14
.
FIG. 6
depicts another modification
8
B of the suction muffler
8
, and as shown therein, the suction muffler
8
B includes first to third elements
18
,
19
,
20
assembled together.
The second element
19
has a generally crescent-shaped open end portion (upper end portion in this case), which has first and second portions opposite to each other and third and fourth portions opposite to each other and each interposed between the first and second portions. The first and second portions have respective relatively large radii of curvature, while the third and fourth portions have respective relatively small radii of curvature.
As shown in
FIGS. 7 and 8
, the first element
18
has a shape corresponding to that of the generally crescent-shaped open end portion of the second element
19
and, hence, has first and second peripheral portions having respective large radii of curvature and third and fourth peripheral portions having respective small radii of curvature and each interposed between the first and second peripheral portions. The first element
18
also has inwardly or downwardly protruding tapered guide ribs
21
each integrally formed therewith at the third or fourth peripheral portion and at the first and second peripheral portions adjacent thereto.
In assembling the first and second elements
18
,
19
, the first and second portions of the second element
19
having the large radii of curvature are subjected to relatively small deformation, while the third and fourth portions of the second element
19
having the small radii of curvature are subjected to larger deformation. Accordingly, the guide ribs
21
formed at the first and second peripheral portions of the first element
18
can be readily inserted into the corresponding portions of the second element
19
, and the former gradually reform the deformation of the second element
19
. Such insertion facilitates subsequent insertion of the guide ribs
21
into the third and fourth portions of the second element
19
, making it possible to realize automated assembling of suction mufflers.
As is the case with the suction muffler
8
A shown in
FIG. 5
, the first element
18
has separated or discontinuous guide ribs
21
and, hence, strains caused by the cooling of the first element
18
after the injection molding are relatively small, thus reducing deformation of the first element
18
.
As shown in
FIG. 9
depicting a further modification
8
C of the suction muffler, first to third elements
22
,
23
,
24
may have respective tabs
22
a
,
23
a
,
24
a
integrally formed therewith and extending laterally outwardly therefrom so that the three elements
22
,
23
,
24
may be assembled together by means of rivets
25
. The assembling of the elements
22
,
23
,
24
by the rivets
25
requires no expensive welding machine or the like. Screws may be used in place of the rivets
25
.
Alternatively, as shown in
FIG. 10
depicting a still further modification
8
D of the suction muffler, first to third elements
26
,
27
,
28
may have respective tabs and/or projections integrally formed therewith. In the case of
FIG. 10
, the first element
26
has downwardly extending tabs
29
each having an opening defined therein, while the second element
27
has projections
31
each formed at an upper portion thereof. Likewise, the second element
27
has downwardly extending tabs
30
each having an opening defined therein, while the third element
28
has projections
32
each formed at an upper portion thereof.
In assembling the three elements
26
,
27
,
28
, each of the projections
31
of the second element
27
is introduced into and received in the opening of the associated tab
29
of the first element
26
, while each of the projections
32
of the third element
28
is introduced into and received in the opening of the associated tab
30
of the second element
27
. The assembling of the elements
26
,
27
,
28
by the engagement of the projections
31
,
32
with the tabs
29
,
30
requires no additional fastening means such, for example, as screws, rivets, or the like.
Claims
- 1. A closed motor-driven compressor comprising:a closed vessel; a compression component elastically supported within the closed vessel; an electric component elastically supported within the closed vessel for driving the compression component; and a suction muffler mounted on the compression component and comprising a plurality of elements assembled together and each made of synthetic resin, one first of the plurality of elements having a guide rib integrally formed therewith that is tapered down toward an adjoining one second of the plurality of elements, thereby facilitating assembly of the two elements, wherein the guide rib is formed discontinuously alone a peripheral edge of the first element, and wherein the one first element has first and second peripheral portions and third and fourth peripheral portions each interposed between the first and second peripheral portions, the first and second peripheral portions having first and second radii of curvature, respectively, the third and fourth peripheral portions having third and fourth radii of curvature, respectively, that are smaller than the first and second radii of curvature, and wherein the guide rib is formed at the third or fourth peripheral portion and at the first and second peripheral portions adjacent thereto.
- 2. The closed motor-driven compressor according to claim 1, wherein the plurality of elements are secured to one another by welding.
- 3. The closed motor-driven compressor according to claim 1, wherein the plurality of elements are secured to one another by fastening elements.
- 4. The closed motor-driven compressor according to claim 1, wherein the plurality of elements are secured to one another by introducing projections formed therewith into openings defined therein.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-147955 |
May 1999 |
JP |
|
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP00/03124 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO00/73656 |
12/7/2000 |
WO |
A |
US Referenced Citations (9)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0 073 469 |
Mar 1983 |
EP |
0 902 184 |
Mar 1999 |
EP |
59-43917 |
Mar 1984 |
JP |