Pipe joints or couplings – With assembly means or feature – Guide and support
Reexamination Certificate
1997-12-30
2001-02-13
Browne, Lynne H. (Department: 3626)
Pipe joints or couplings
With assembly means or feature
Guide and support
C285S027000, C285S055000, C285S330000, C285S332000, C285S332100
Reexamination Certificate
active
06186556
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an enclosed type compressor used in a refrigerating machine, air conditioner and others, and more particularly, to the connection between the connection pipe and the compression element used in the enclosed type compressor. A sectional view of a conventional enclosed type compressor is shown in FIG.
3
. In FIG.
3
. when connecting a suction pipe
101
to an enclosed type compressor, first, a motor
103
and a compression element
104
, such as a cylinder
105
, are accommodated and fixed in an enclosed container
102
by press-fitting or other means. Then a connection pipe
107
is inserted from outside of a case into a refrigerant suction hole
106
formed in the cylinder
105
. Further, the suction pipe
101
is coupled to this connection pipe
107
.
An essential sectional view showing the connection state of a conventional suction pipe is shown in FIG.
4
. In a connection pipe insertion hole
110
in the enclosed container
102
, a guide pipe
109
is preliminarily affixed by silver brazing or other means. In this enclosed container
102
, the motor
103
and the compression element
104
, such as cylinder
105
are accommodated and fixed by press-fitting or other means. The cylinder
105
is formed in this refrigerant suction hole
106
, and the connection pipe
107
is inserted into the connection pipe insertion hole
110
communicating with this refrigerant suction hole
106
by penetrating through the guide pipe
109
. A copper plating
111
is applied on the outer surface of the connection pipe
107
, and this copper plating facilitates brazing between the connection pipe
107
and the suction pipe
101
of the accumulator.
In the conventional structure in
FIG. 4
, however, when press-fitting the copper plated connection pipe
107
into the connection pipe insertion hole
106
of the cylinder
105
, the copper plating is peeled off by an inlet end portion
112
of the insertion hole. The peeled copper plating may be caught in the compression mechanism, which may lead to a locking phenomenon. To solve this problem, attempts have been made to prevent the troubles due to the peeling of copper plating by removing the copper plating preliminarily from the insertion area
120
of the connection pipe
107
. However, such involves an additional cost required for removal of the copper plate. Hence, the cost of manufacturing is raised.
It is hence an object of the invention to present an enclosed type compressor capable of preventing the occurrence of the locking of the compression mechanism by preventing the peeling of the copper plating when inserting and connecting the connection pipe into the compression element.
SUMMARY OF THE INVENTION
The invention provides an enclosed type compressor comprising an enclosed container, a compression element placed in the enclosed container, and a connection pipe for connecting a suction pipe for circulating a refrigerant to the compression element. The compression element has an insertion hole for inserting a first end of the connection pipe inside. The insertion hole has an inlet in a shape smoothly spreading toward the inlet. The connection pipe has a plating layer formed at least on the outer surface. The first end of the connection pipe is press-fitted into the inlet of the insertion hole, and an outer surface of the connection pipe is connected to the inside of the insertion hole.
A method of manufacturing an enclosed type compressor of an enclosed type compressor comprising an enclosed container, a compression element placed in the enclosed container, and a connection pipe for connecting a suction pipe for circulating a refrigerant to the compression element, comprises: (a) a step of forming an inlet having a shape that spreads smoothly toward the inlet in an insertion hole of the compression element, (b) a step of placing a plating layer at least on an outer surface in the connection pipe, and (c) a step of press-fitting a first end of the connection pipe into the inlet of the insertion hole, and connecting the outer surface of the connection pipe and inside of the insertion hole.
Preferably, the plating layer is a copper plating layer.
Preferably, the compression element is a cylinder.
Preferably, a second end of the connection pipe is brazed and connected to the suction pipe placed outside of the enclosed container.
Preferably, the inlet of the insertion hole is in a curvature form of which the sectional area increases gradually toward the inlet.
Preferably, the inlet of the insertion hole is in a taper form of which the sectional area increases gradually toward the inlet.
Preferably, the taper form of the inlet of the insertion hole has an angle in a range from about 1 degree to about 30 degree.
Preferably, the connection pipe is a steel pipe.
Preferably, the copper plating layer has a thickness in a range from about 5 microns to about 100 microns.
Preferably, the invention further comprises a guide pipe installed outside of the enclosed container covering the inlet of the insertion hole. The connection pipe is connected to the insertion hole penetrating through the guide pipe.
In this constitution, when the connection pipe, having the plating layer, is press-fitted into the insertion hole of the compression element, the peeling of the plating layer of the connection pipe is prevented. Therefore, there in no peeled plating that can get caught in the compression mechanism, and the locking phenomenon due to the biting of peeled plating can be prevented. As a result, the present invention has the advantage of providing a compressor of high reliability. Moreover, it is not necessary to peel off the plating from the insertion area out of the plating layer placed in the connection pipe. As a result, the manufacturing cost is not increased.
The invention itself, together with further objects and attendant advantages, will best be understood by reference to the following detailed description taken in conjunction with the accompanying figures.
REFERENCES:
patent: 746801 (1903-12-01), Earheart
patent: 1402978 (1922-01-01), Thomas
patent: 1513687 (1924-10-01), Bacon
patent: 2516743 (1950-07-01), Allin
patent: 4508367 (1985-04-01), Oreopoulos
patent: 4659116 (1987-04-01), Cameron
patent: 5171042 (1992-12-01), Faidiga
patent: 5215452 (1993-06-01), Yamamura et al.
patent: 5217359 (1993-06-01), Kawahara et al.
patent: 5338072 (1994-08-01), Bitter et al.
patent: 5667255 (1997-09-01), Kato
patent: 5695326 (1997-12-01), Oka et al.
patent: 5848813 (1998-12-01), Albrecht
Masunaga Hiroyuki
Masuyama Ryoko
Mori Akiko
Muramatsu Shigeru
Browne Lynne H.
Matsushita Electric - Industrial Co., Ltd.
McDermott & Will & Emery
Pickard Alison K.
LandOfFree
Enclosed type compressor and its manufacturing method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Enclosed type compressor and its manufacturing method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Enclosed type compressor and its manufacturing method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2613116