Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2002-05-09
2003-06-03
Tyler, Cheryl J. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C417S410100, C417S488000, C417S547000
Reexamination Certificate
active
06572348
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electromagnetic compressor and a manufacturing method therefor, and more particularly, to an electromagnetic compressor suitably used to suck in and compress a combustible gas, such as town gas, or some other gas and a manufacturing method therefor.
2. Description of the Related Art
Conventionally, electromagnetic compressors that compress and discharge fluids such as air have widely been used, and various inventions related to the electromagnetic compressors have been made. A typical example of an electromagnetic compressor of this type is described in Jpn. Pat. Appln. KOKOKU Publication No. 57-30984, which will be described in brief with reference to FIG.
13
.
An electromagnetic compressor
200
has a structure such that a front frame
202
and a front cover
203
are arranged successively in front (see the left-hand side of the drawing) of a stationary electromagnetic circuit
201
, while a rear frame
204
and a rear cover
205
are arranged successively in the rear (see the right-hand side of the drawing). These elements are coupled together to form the body shell of the electromagnetic compressor
200
.
The front frame
202
has a front collar
206
and a rear collar
207
. The front collar
206
is formed integrally having a front fitting cylinder portion
208
and a rear fitting cylinder portion
209
that are aligned with each other. A front cylinder
210
is fitted in the front fitting cylinder portion
208
, a rear cylinder
211
is fitted in the rear fitting cylinder portion
209
, and the front frame
202
and the rear cylinder
211
are fixed together by means of a plurality of screws
212
.
The rear frame
204
has a front collar
213
and an outer collar
214
. The rear collar
207
of the front frame
202
and the front collar
213
of the rear frame
204
are screwed together to the stationary electromagnetic circuit
201
. Thus, the respective opposite faces of the rear collar
207
and the front collar
213
abut against the front and rear faces, respectively, of the stationary electromagnetic circuit
201
.
The stationary electromagnetic circuit
201
is wound with a coil
215
. North or south magnetic poles that are formed as the coil
215
is energized are located in longitudinal notches of the rear fitting cylinder portion
209
. A magnetic armature
220
that is electromagnetically attracted to the magnetic poles is held between a front piston
222
, which has a piston head
221
slidable in the front cylinder
210
, and a rear piston
223
slidable in the rear cylinder
211
. These three elements are fixed together by means of a screw
224
. A return spring
226
is interposed between the rear piston
223
and a cap
225
of the rear cylinder
211
.
If the stationary electromagnetic circuit
201
is excited in the compressor constructed in this manner, the magnetic armature
220
, which is integral with the front and rear pistons
222
and
223
(hereinafter referred to simply as the piston
222
), is advanced by electromagnetic attraction as illustrated, resisting the resilient force of the return spring
226
. If the excitation is cancelled, on the other hand, the piston
222
returns pressed by the return spring
226
. As the piston
222
reciprocates in this manner, air in a working chamber
227
that is fixed in the front cylinder
210
is repeatedly brought to rare and dense states.
Thus, when the piston
222
is retreated by means of the force of electromagnetic attraction, an inlet valve
228
attached to the piston head
221
opens to the working chamber
227
. Thereupon, air introduced into the compressor body through inlet ports
230
of the rear cover
205
flows into the working chamber
227
through a filter
231
, supply holes
232
,
232
, and inlet ports
233
. When the piston
222
advances pressed by the return spring
226
, on the other hand, the air in the working chamber
227
becomes dense. Consequently, a discharge valve that is attached to a part of the wall portion of the working chamber
227
opens, whereupon the compressed air is supplied through discharge ports
234
, a tank
235
, and a discharge port
236
to an external apparatus that is connected to a hose as required.
If the compressor constructed in this manner is applied to the suction and compression of a combustible gas such as town gas, however, the combustible gas sucked into the working chamber
227
is inevitably guided to the supply holes
232
and the inlet ports
233
via the periphery of electrical parts, e.g., the coil
215
and the like. Since the front and rear faces of the stationary electromagnetic circuit
201
, the rear collar
207
, and the front collar
213
abut against one another, moreover, there is a possibility of the combustible gas leaking out through the abutting portions.
BRIEF SUMMARY OF THE INVENTION
According to the present invention, there is provided an electromagnetic compressor capable of reciprocating a piston to suck in and compress a gas by means of the force of attraction of an electromagnet and the resilient force of a return spring. The compressor comprises a cylinder assembly including a front cylinder portion, a rear cylinder portion, and a center hole capable of storing the piston for reciprocation and having a working chamber defined by the piston; an electromagnet located between the front cylinder portion and the rear cylinder portion and capable of actuating the piston; an electrically conductive member for supplying electricity to the electromagnet; and an internal passage connecting the working chamber to the outside of the compressor. The cylinder assembly and the electromagnet have an integral structure molded from a resin in a manner such that the internal passage is hermetically sealed with respect to the electromagnet and the electrically conductive member.
According to the present invention, there is further provided an electromagnetic compressor capable of reciprocating a piston to suck in and compress a gas by means of the force of attraction of an electromagnet and the resilient force of a return spring. The compressor comprises a housing assembly having a center hole in which the piston is located and a resin layer molded around an electromagnet forming a pair of magnetic poles on the diametrically opposite sides of the piston; and a cylinder portion stored in the center hole, storing the piston for reciprocation, and having a working chamber defined by means of the piston. The inside diameter of the cylinder portion and the outside diameter of the piston sliding in the cylinder are selectable.
According to the present invention, there is still further provided a manufacturing method for an electromagnetic compressor capable of reciprocating a piston to suck in and compress a gas by means of the force of attraction of an electromagnet and the resilient force of a return spring. The method comprises providing a cavity-side mold having a cavity and a columnar protrusion for centering in the cavity and a movable mold having a gate hole; inserting an iron core wound with coils along the columnar protrusion into the cavity-side mold and positioning the iron core so that magnetic poles formed on the iron core are located in given positions; locating the movable mold on the cavity-side mold; and injecting a thermosetting resin into the molds through the gate hole of the movable mold, thereby molding a housing assembly.
Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter.
REFERENCES:
patent: 3302582 (1967-02-01), Kofink
patent: 4090816 (1978-05-01), Takahashi
patent: 4547757 (1985-10-01), Yamada
patent: 4925155 (1990-05-01), Carman
patent: 5518372 (1996-05-01), Chin
patent: 5818131 (1998-10-01), Zhang
patent: 6326706 (
Nakao Haruki
Nishikiori Masanori
Sakurai Hiroto
Nitto Kohki Co. Ltd.
Pennie & Edmonds LLP
Tyler Cheryl J.
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