Motor compressor and cooling apparatus using the same

Pumps – Motor driven – Electric or magnetic motor

Reexamination Certificate

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Details

C417S423700, C417S902000, C310S156530, C310S254100, C310S216006

Reexamination Certificate

active

06582207

ABSTRACT:

BACKGROUND OF THE INVENTION
(i) Field of the Invention
The present invention relates to a motor compressor comprising a motor element and a compression element which is driven by a rotating shaft connected to the motor element in a closed vessel.
(ii) Description of the Related Art
Heretofore, this kind of motor compressor has been disclosed in Japanese Patent Application Laid-Open Nos. 288180/1998 (FO4C29/00) and 350444/1993 previously filed by the present applicant. An induction motor, a DC motor, and so forth are used as the motor of the conventional motor compressor, but the DC motor is designed so that a laminated thickness of a permanent magnet and a rotor is the same as that of a stator in case that it is a rare earth permanent magnet motor, and the laminated thickness of the rotator and the permanent magnet is higher than that of the stator in case that it is a ferrite permanent motor.
Next, this conventional type of the motor
100
will be explained by use of FIG.
21
and
FIG. 22. A
closed vessel
101
in the drawings contains a motor
102
(e.g., a DC motor) as the motor element in the internal upper side thereof, and a compression element
103
being rotatably driven by this motor
102
in the lower side. The closed vessel
101
, which comprises a cylindrical shell
101
A with the upper end thereof opened, and an end cap
101
B that clogs the upper end opening of the shell
101
A, is a two-section configuration and is configured by capping the cylindrical shell
101
A with the end cap
101
B to close it with a high frequency deposition, and so forth, after inserting the motor
102
and the compression element
103
within the shell
101
A. Furthermore, the bottom within the shell
101
A of the closed vessel
101
becomes an oil sump SO.
The motor
102
is constituted of a stator
104
fixed to the internal wall of the closed vessel
101
and a rotator
105
with a rotating shaft
106
centered rotatably supported in the inside of this stator
104
. The stator
104
is constituted of a stator core
174
configured by laminating a plurality of steel sheets for stator sheets with substantially a donut shape, and a stator winding (drive coil)
107
for applying rotating magnet field to the rotator
105
, which is mounted with a distributed winding technique on a plurality of teeth formed in an internal periphery of this stator core
174
. Moreover, the peripheral surface of this status core
174
contacts and is fixed to the internal wall of the shell
101
A of the closed vessel
101
.
In this case, a plurality of notches
176
are formed in the peripheral surface of the stator core
174
, and these notches
176
are spaced from the internal wall of the shell
101
A, wherein a path
177
is configured.
The compression element
103
comprises a first cylinder for a rotary
109
and a second cylinders for a rotary
110
separated by an intermediate parting stop
108
. To each of the cylinder
109
and
110
are attached eccentrics
111
and
112
being rotatably driven by the rotating shaft
106
, and each eccentricity of the eccentrics
111
and
112
is 180° degree out of phase from the other.
113
and
114
indicate a first roller and a second roller that rotate within the cylinder
109
and
110
, respectively, and each rotates within the cylinders by the rotation of the eccentrics
111
and
112
, respectively.
115
and
116
indicate a first frame and a second frame. The first frame
115
causes compressed air to be formed between the parting stop
108
and the frame with the cylinder
109
closed, and the second frame
116
also causes compressed air to be formed between the parting stop
108
and the frame with the cylinder
110
closed. Furthermore, the first frame
115
and the second frame
116
comprise bearings
117
and
118
, respectively, that rotatably and axially support the lower portion of the rotating shaft
106
.
119
and
120
indicate cap mufflers which are attached so as to cover the first frame
115
and the second frame
116
. In addition, the cylinder
109
and the cap muffler
119
are in mutual communication by a communicating hole (not shown) provided in the first frame
115
, and the cylinder
110
and the cap muffler
120
are also in mutual communication by a communicating hole (not shown) provided in the second frame
116
,
121
, which is a bypass pipe provided outside the closed vessel
101
, is in communication with the internal side of the cap muffler
120
.
122
is a vent pipe provided on the top of the closed vessel
101
, and
123
and
124
are suction pipes that connect to the cylinder
109
and
110
respectively. Furthermore,
125
, which is a closed terminal, is for supplying a power from the external side of the closed vessel
101
to the stator winding
107
(a lead wire that connects the closed terminal
125
and the stator winding
107
is not shown in the figure).
A rotator core
126
of the rotator
105
has a plurality of steel sheets for a rotator with a predetermined shape stamped from magnetic steel sheets with thickness 0.003 mm to 0.007 mm to be laminated to caulk each other for integration.
In this case, the steel sheets for a rotor of the rotator core
126
are stamped from magnetic steel sheets so that salient poles
128
,
129
,
130
and
131
are formed that construct a quadrupole, and
132
,
133
,
134
and
135
are concavities provided so that the salient poles are formed between each of the salient poles
128
,
129
,
130
and
131
, and the other respectively.
Slots
141
,
142
,
143
and
144
for inserting a magnetic substance
145
(permanent magnet) correspond to each of the salient poles
128
,
129
,
130
and
131
, respectively, and they are concentrically slotted on the periphery side of the rotator core
126
along the direction of an axis of the rotating shaft
106
.
Furthermore, a hole
146
, into which the rotating shaft
106
is shrink-fitted, is formed at the center of the rotator core
126
. Each rotator core
126
is formed by caulking each other for integration after laminating a plurality of steel sheets for a rotator.
The magnetic substance
145
set forth above is constituted of a rare earth magnetic material such as a praseodymium magnet material or a neodymium magnetic material whose surface is plated with nickel or the like, and the external shape thereof is to be a profile rectangle, and, as a whole, to be rectangular. Each of the slots
141
,
142
,
143
and
144
is to be sized so that this magnetic substance
145
is inserted. Moreover,
166
and
167
, which are flat-shape end members being attached to the upper and the lower end of the rotator core
126
, are formed of non-magnetic materials such as stainless steel, brass or the like in a nearly discus shape.
In addition,
172
, which is located above the end member
166
, is a discus-shape plate for separating oil attached to the rotator
105
, and
173
is a balancing weight attached between the plate
172
and the end surface
166
.
In such a configuration, when a power is applied to the stator winding
107
of the stator
104
of the motor
102
, a rotating magnetic filed is formed to rotate the rotator
105
. Rollers
113
, and
114
within the cylinder
109
and
110
are eccentrically rotated via the rotating shaft
106
by this rotation of the rotator
105
, and suction gas sucked from the suction
123
and
124
is compressed.
The compressed high-pressure gas is vented within the cap muffler
119
and from the cylinder
109
via the communicating hole, and is vented within the closed vessel
101
from the vent hole (not shown) formed in this cup muffler
119
. On the other hand, from the cylinder
110
, the compressed high-pressure gas is vented into the cup muffler
120
via the communicating hole, and is vented into the closed vessel
101
through the bypass pipe
121
.
The vented high-pressure gas passes through a gap within the motor
102
to reach the vent pipe
122
, and is vented to the external side. On the other hand, oil is contained in the gas, but this oil, which is separated by the plate
172

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