Compressor

Details Compressor Compressor

1999-07-30

2001-07-03

Walberg, Teresa (Department: 3742)

Pumps

Miscellaneous

C062S175000

Reexamination Certificate

active

06254365

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a compressor, and more particularly, it relates to a pipe connection structure of a compressor.
2. Description of the Prior Art
In general, a closed rotary compressor forming a refrigerant cycle is known as a compressor employed for an air conditioner or the like. For example, Japanese Patent Laying-Open No. 63-36075 (1988) discloses such a rotary compressor.
FIG. 18
is a longitudinal sectional view showing the overall structure of the conventional rotary compressor disclosed in the above gazette, and
FIG. 19
is an enlarged sectional view showing a pipe connecting portion of the conventional rotary compressor shown in FIG.
18
.
Referring to
FIG. 18
, a conventional rotary compressor
101
has a motor (electric element)
103
arranged in an upper portion of an iron body shell (casing)
102
. A compression element
105
is coupled to a lower portion of the motor
103
through a crankshaft
104
. An accumulator
130
is arranged on a side portion of the rotary compressor
101
.
With reference to
FIGS. 18 and 19
, the structure of the pipe connecting portion of the conventional rotary compressor
101
is now described in detail. The iron body shell
102
is provided with a connection hole
102
a
projecting outward from the outer surface of the body shell
102
. Such an outwardly projecting connection hole
102
a
is formed by perforating a portion of the body shell
102
for forming the connection hole
102
a
and thereafter performing burring. An iron body liner
122
is engaged into the connection hole
102
a
formed in the aforementioned manner. The iron body liner
122
is fixed to the projecting end surface of the connection hole
102
a
by brazing
141
. The body liner
122
relaxes transmission of vibration of the body shell
102
to a refrigerant flow pipe
131
of the accumulator
130
.
An iron pump liner
123
for connecting the refrigerant flow pipe
131
with a refrigerant suction port
110
is inserted into the body liner
122
. An end of the pump liner
123
is press-fitted into the refrigerant suction port
110
having a uniform inner diameter over the whole, while the refrigerant flow pipe
131
is inserted into the other end of the pump liner
123
. The pump liner
123
of iron and the refrigerant flow hole
131
of copper are fixed to the body liner
122
of copper by brazing
142
.
In the pipe connection structure of the aforementioned conventional rotary compressor
101
, however, the number of components is disadvantageously increased due to the triple structure of the refrigerant flow pipe
131
, the pump liner
123
and the body liner
122
. Further, burring or the like must be performed in addition to perforation in order to form the connection hole
102
a
in the outwardly projecting shape, and hence the step of forming the connection hole
102
a
is disadvantageously complicated.
In this regard, a pipe connection structure reducing the number of components by omitting the body liner
122
and the pump liner
123
is proposed in general. For example, Japanese Patent Laying-Open No. 7-117042 (1995) or 7-117043 (1995) discloses such a structure. In the proposed pipe connection structure, however, the connection hole
102
a
of the body shell (casing)
102
projects outward, and burring or the like must be performed after perforation for forming this shape. Although the number of components can be reduced to some extent in this structure, it is difficult to solve the problem that the step of forming the connection hole
102
is complicated.
Thus, it is generally difficult to provide a compressor which can reduce the number of components while simplifying a step of forming a connection hole of a casing.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a compressor which can reduce the number of components while simplifying a step of forming a connection hole.
Another object of the present invention is to provide a compressor which can smoothly and readily press-fit a refrigerant flow pipe of an accumulator into a refrigerant suction port of a compression element.
A compressor according to an aspect of the present invention comprises a compression element and a casing. The compression element has a refrigerant suction port connected with a refrigerant flow pipe of an accumulator. The casing is formed to enclose the compression element, and has a connection hole in a portion opposed to the refrigerant suction port. The connection hole is formed substantially flush with the outer surface of the casing without projecting from the outer surface of the casing. A forward end portion of the refrigerant flow pipe of the accumulator is inserted into the refrigerant suction port of the compression element, and fixed to the casing. In the compressor according to this aspect, the connection hole of the casing is formed substantially flush with the outer surface of the casing without projecting from the outer surface of the casing as described above so that the connection hole is formed only by perforation with no requirement for burring or the like, whereby the step of forming the connection hole can be simplified. Further, the refrigerant flow pipe of the accumulator is inserted into the refrigerant suction port to require no pump liner (connection pipe) for connecting the refrigerant flow pipe with the refrigerant suction port, whereby the number of components and the number of assembly steps can be reduced. In the structure according to this aspect of the present invention, therefore, it is possible to provide a compressor which can reduce the number of components and simplify a step of forming a connection hole.
In the structure of the compressor according to the aforementioned aspect of the present invention, the inner surface of the refrigerant suction port may include a tapered part and the forward end portion of the refrigerant flow pipe of the accumulator may include a chamfered part, so that the refrigerant flow pipe is press-fitted into the tapered part of the refrigerant suction port. According to this structure, the tapered part of the refrigerant suction port absorbs dispersion of the outer diameter of the refrigerant flow pipe when the refrigerant flow pipe is press-fitted into the refrigerant suction port, whereby a substantially uniform press-fit margin can be obtained even if the outer diameter of the refrigerant flow pipe is dispersed. If the refrigerant flow pipe is press-fitted into a straight refrigerant sunction port having no tapered part, the forward end portion of the refrigerant flow pipe may be stripped off and pulverized into fine crushed powder (foreign matter), which may exert a bad influence on the performance of the compressor when entering the compressor. According to the structure of the present invention, the forward end portion of the refrigerant flow pipe can be effectively prevented from being stripped off by providing the tapered part on the refrigerant suction port while providing the chamfered part on the forward end portion of the refrigerant flow pipe. According to this structure, therefore, the refrigerant flow pipe of the accumulator can be smoothly and readily press-fitted into the refrigerant suction port. In this structure, further, a portion of the compression element opposed to the connection hole may include a flat surface part. According to this structure, the accuracy of the tapered part can be readily checked with reference to the flat surface part after formation of the tapered part, so that the accuracy of the tapered part can be kept substantially uniform.
The compressor according to the aforementioned aspect may further comprise a cylindrical body inserted into the connection hole and fixed to the casing, so that the forward end portion of the refrigerant flow pipe of the accumulator passes through the cylindrical body and is press-fitted into the refrigerant suction port and fixed to the casing through the cylindrical body. According to this structure, the cylindrical body can relax transmission

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