Multi-cylinder rotary compressor

Details Multi-cylinder rotary compressor Multi-cylinder rotary compressor

2000-06-30

2001-08-28

Denion, Thomas (Department: 3748)

Rotary expansible chamber devices

Weight balanced working member or partition

C418S060000, C418S063000, C418S150000

Reexamination Certificate

active

06280168

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multi-cylinder rotary compressor mounted in, for example, an air conditioner or a freezing machine.
2. Description of the Prior Art
This kind of conventional multi-cylinder rotary compressor
200
will be explained with reference to FIG.
10
. In this drawing, reference numeral
201
denotes a closed container in which an electric motor
202
constituted by a DC brushless motor as an electric element is provided on the upper side and a rotary compression element
203
driven to rotate by the electric element
202
is accommodated on the lower side. The closed container
201
has a half-split structure composed of a cylindrical shell portion
201
A whose upper end is opened and an end cap portion
201
B for closing the upper end opening of the shell portion
201
A, and it is constituted by fitting the end cap portion
201
B on the shell portion
201
A to be sealed by high frequency deposition and the like after accommodating the electric motor
202
and the compression element
203
in the shell portion
201
A. Further, the bottom portion in the shell portion
201
A of the closed container
201
is an oil bank B.
The electric motor
202
is constituted by a stator
204
fixed on the inner wall of the closed container
201
, and a rotator
205
which is supported by a rotating shaft
206
extending in the axial direction of the cylinder of the closed container
201
and which is rotatable around the rotating shaft
206
on the inner side of the stator
204
. The stator
204
is constituted by a stator core
274
configured by superimposing a plurality of stator iron plates having a substantially donut-like shape, and a stator winding (driving coil)
207
which is wound around a plurality of cog portions formed on the inner periphery of the stator core
274
by the distributed winding method and supplies the rotating magnetic field to the rotator
205
. The outer peripheral surface of the stator core
274
is brought into contact with and fixed to the inner wall of the shell portion
201
A of the closed container
201
.
The rotary compression element
203
includes rotary cylinders
209
and
210
separated by an intermediate partition plate
208
. Eccentric portions
211
and
212
driven to rotate by the rotating shaft
206
are attached to the respective cylinders
209
and
210
, and the phases of these eccentric portions
211
and
212
are shifted from each other 180 degrees at the eccentric positions.
Reference numeral
213
and
214
designate a first roller and a second roller which rotate in the cylinders
209
and
210
respectively and turn in the cylinders by rotation of the eccentric portions
211
and
212
. Reference numerals
215
and
216
denote a first bearing and a second bearing. The first bearing
215
forms a closed compression space of the cylinder
209
between itself and the intermediate partition plate
208
while the second bearing
216
forms a closed compression space of the cylinder
210
between itself and the intermediate partition plate
208
. Further, the first bearing
215
and the second bearing
216
respectively include bearing portions
217
and
218
which rotatably pivot the lower portion of the rotating shaft
206
.
Reference numerals
219
and
220
represent cup mufflers which are disposed so as to cover the first bearing
215
and the second bearing
216
. It is to be noted that the cylinder
209
communicates with the cup muffler
219
via a non-illustrated communication hole formed to the first bearing
215
, and the cylinder
210
also communicates with the cup muffler
220
via a non-illustrated communication hole formed to the second bearing
216
. In addition, the lower cup muffler
220
communicates with the inside of the closed container
201
above the cup muffler
219
through a through hole
279
piercing each bearing or cylinder and a bypass pipe
221
attached to the outside of the closed container
201
.
Reference numeral
222
denotes a discharge pipe provided above the closed container
210
, and reference numerals
223
and
224
represent suction pipes leading to the cylinders
209
and
210
. Moreover, reference numeral
225
designates a closed terminal which supplies power from the outside of the closed container
201
to the stator winding
207
of the stator
204
(a lead wire connecting the closed terminal
225
to the stator winding
207
is not illustrated).
Reference numeral
226
represents a rotator core of the rotator
205
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 predetermined shape and caulking them each other to be integrally layered.
In this case, the rotator iron plate of the rotator core
226
is punched out from the electromagnetic steel plate in such a manner that salient pole portions constituting four magnetic poles are formed, and a magnetic body (a permanent magnet) is inserted into the rotator core
226
.
Reference numeral
251
is a rivet for caulking the rotator core
226
;
272
, a discoid oil separation plate attached to the rotator
205
at a position above the rotator
205
;
273
, an upper balancer attached between the plate
272
and the top face of the rotator core
226
; and
284
, a lower balancer attached to the bottom face of the rotator core
226
.
With such a configuration, when the rotator winding
207
of the rotator
204
of the electric motor
202
is energized, the rotating magnetic field is formed to rotate the rotator
205
. Rotation of the rotator
205
causes eccentric rotation of the rollers
213
and
214
in the cylinders
209
and
210
through the rotating shaft
206
, and an intake gas absorbed from the suction pipes
223
and
224
is compressed.
The compressed high pressure gas is emitted from the cylinder
209
into the cup muffler
219
through the communication hole and discharged from a discharge hole formed to the cup muffler
219
into the upper (a direction of the electric motor
202
) closed container
201
. On the other hand, the gas is emitted from the cylinder
210
into the cup muffler
220
through the communication hole and further discharged into the closed container
201
above the cup muffler
219
via the through hole
279
and the bypass pipe
221
.
The discharged high pressure gas passes a gap in the electric motor
202
to reach the discharge pipe
222
and is discharged outside. On the other hand, although the oil is contained in the gas, this oil is separated by the plate
272
and others before reaching the discharge pipe
222
and directed to the outside by the centrifugal force. Further, it flows down to the oil bank B through the passage formed between the stator
204
and the closed container
201
.
FIG. 11
shows a multi-cylinder rotary compressor
300
using an AC motor as an electric motor. In this drawing, reference numeral
301
denotes a closed container in which an electric motor
302
composed of an AC motor (an induction motor) is accommodated on the upper side as the electric element and a rotary compression element
303
driven to rotate by the electric motor
302
is housed on the lower side. The closed container
301
has a half-split configuration made up of a cylindrical shell portion
301
A whose upper end is opened and an end cap portion
301
B for closing the upper opening of the shell portion
301
A, and this closed container
301
is constituted by accommodating the electric motor
302
and the rotary compression element
303
in the shell portion
301
A and thereafter fitting the end cap portion
301
B to the shell portion
301
A to be sealed by high frequency deposition and the like. The bottom portion in the shell portion
301
A of the closed container
301
serves as an oil bank B.
The electric motor
302
is constituted by a stator
304
fixed on the inner wall of the closed container
301
and a rotator
305
which is supported by a rotating shaft extending in the axial direction of the cylinder of t

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