Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2000-06-28
2003-03-18
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S368000, C417S902000
Reexamination Certificate
active
06533558
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a closed rotary compressor mounted in, for example, an air conditioner or a freezing machine.
2. Description of the Prior Art
This kind of conventional closed rotary compressor
100
will be explained with reference to
FIGS. 14
to
16
. In each drawing, reference numeral
101
denotes a closed container in which an electric motor (for example, a DC brushless motor)
102
as an electric element is provided on the upper side and a compression element
103
driven to rotate by the electric motor
102
is accommodated on the lower side. The closed container
101
has a half-split structure composed of a cylindrical shell portion
101
A whose upper end is opened and an end cap portion
101
B whose upper end opening is closed above the shell portion
101
A, and it is constituted by fitting the end cap portion
101
B on the shell portion
101
A to be closed by high frequency deposition and the like after accommodating the electric motor
102
and the compression element
103
in the shell portion
101
A. Further, the bottom portion in the shell portion
101
A of the closed container
101
is an oil bank B.
The electric motor
102
is constituted by a stator
104
fixed on the inner wall of the closed container
101
, and & rotator
105
supported so as to be rotatable around a rotating shaft
106
inside the stator
104
. The stator
104
is constituted by a stator core
174
configured by superimposing a plurality of stator iron plates having a substantially donut-like shape, and a stator winding (driving coil)
107
for giving a rotating magnetic field to the rotator
105
attached to a plurality of cog portions
175
formed on the internal periphery of the stator core
174
by the distributed winding method. The outer peripheral surface of the stator core
174
is brought into contact with and fixed to the inner wall of the shell portion
101
A of the closed container
101
.
In this case, a plurality of notches
176
are formed on the outer peripheral surface of the stator core
174
, and the notch
176
is estranged from the inner wall of the shell portion
101
A so that a passage
177
is formed in that space.
The compression element
103
includes a first rotary cylinder
109
and a second rotary cylinder
101
separated by an intermediate partition plate
108
. Eccentric portions
111
and
112
driven to rotate by the rotating shaft
106
are attached to the respective cylinders
109
and
110
, and the phases of these eccentric portions
111
and
112
are shifted from each other 180 degrees at the eccentric positions.
Reference numerals
113
and
114
designate a first roller and a second roller which rotate in the cylinders
109
and
110
respectively and turn in the cylinders by rotation of the eccentric portions
111
and
112
. Reference numerals
115
and
116
denote first frame body and a second frame body, and the first frame body
115
forms a closed compression space for the cylinder
109
between itself and the partition plate
108
while the second frame body
116
similarly forms a closed compression space for the cylinder
110
between itself and the partition plate
108
. Further, the first frame body
115
and the second frame body
116
respectively include bearing portions
117
and
118
which rotatably pivot the lower portion of the rotating shaft
106
.
Reference numerals
119
and
120
represent cup mufflers which are disposed so as to cover the first frame body
115
and the second frame body
116
, respectively. It is to be noted that the cylinder
109
communicates with the cup muffler
119
via a non-illustrated communication hole formed to the first frame body
115
, and the cylinder
110
also communicates with the cup muffler
120
via a non-illustrated communication hole formed to the second frame body
116
. Reference numeral
121
denotes a bypass pipe provided outside the closed container
101
to communicate with the inside of the cup muffler
120
.
Reference numeral
122
denotes a discharge pipe provided above the closed container
101
, and reference numerals
123
and
124
represent suction pipes leading to the cylinders
109
and
110
. Moreover, reference numeral
125
designates a closed terminal which supplies power from the outside of the closed container
101
to the stator winding
107
of the stator
104
(a lead wire connecting the closed terminal
125
to the stator winding
107
is not illustrated).
Reference numeral
126
represents a rotator core of the rotator
105
which is obtained by superimposing a plurality of rotator iron plates punched out from an. electromagnetic steel plate having a thickness of 0.3 mm to 0.7 mm in a shape such as shown in
FIGS. 15 and 16
and caulking them each other to be integrally layered.
In this case, the rotator iron plate of the rotator core
126
is punched out from the electromagnetic steel plate in such a manner that salient pole portions
128
to
131
constituting four magnetic poles, and reference numerals
132
to
135
represent concave portions provided so that salient pole portions are formed between the respective salient pole portions
128
to
131
.
Reference numerals
141
to
144
denote slots into which a magnetic body
145
(a permanent magnet) is inserted. These slots
141
to
144
correspond to the respective salient pole portions
128
to
131
and formed on a concentric circle on the outer peripheral side of the rotator core
126
along the axial direction of the rotating shaft
106
.
Further, reference numeral
146
designates a hole which is formed at the center of the rotator core
126
and to which the rotating shaft
106
is shrinkage-fitted.
Reference numerals
147
to
150
denote through holes having a size and a shape with which later-described rivets
151
for caulking are inserted. These through holes
147
to
150
are formed to be associated with the inner sides of the respective slots
141
to
144
. Furthermore, reference numerals
161
to
164
represent air holes for forming oil passages formed between the respective through holes
147
to
150
. After the multiple respective rotator iron plates are superimposed, they are caulked each other to be integrated, thereby forming the rotator core
126
.
On the other hand, the magnetic body
145
is constituted by a rare earth magnet member such as a praseodymium based magnet or a neodymium based magnet whose surface is nickel-plated, and the outward form thereof is a rectangular shape as a whole with a rectangular cross section. The respective slots
141
to
144
have a size allowing insertion of the magnetic body
145
therethrough.
Reference numerals
166
and
167
denote tabular edge members attached to the upper and lower ends of the rotator core
126
and molded into a substantially discoid shape by using a non-magnetic material such as stainless or brass. Through holes are similarly formed to the edge members
166
and
167
at positions corresponding to the through holes
147
to
150
.
It is to be noted that reference numeral
172
represents a discoid oil separation plate attached to the rotator
105
so as to be positioned above the edge member
166
and
173
designates a balance weight disposed between the plate
172
and the edge member
166
.
With such a configuration, when the rotator winding
107
of the rotator
104
of the electric motor
102
is energized, the rotating magnetic field is formed to rotate the rotator
105
. Rotation of the rotator
105
causes eccentric rotation of the rollers
113
and
114
in the cylinders
109
and
110
through the rotating shaft
106
, and an intake gas absorbed from the intake pipes
123
and
124
is compressed.
The compressed high pressure gas is emitted from the cylinder
109
into the cup muffler
119
through the communication hole and discharged from a non-illustrated discharge hole formed to the cup muffler
119
into the closed container
101
. On the other hand, the gas is emitted from the cylinder
110
into the cup muffler
120
through the com
Fujiwara Kazuaki
Hashimoto Akira
Higuchi Tsuyoshi
Matsumoto Kenzo
Matsuura Dai
Freay Charles G.
Sanyo Electric Co., LTD
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