Pumps – Including means to prevent foreign material settling from... – By application of separate fluid
Reexamination Certificate
2001-01-02
2003-03-18
Freay, Charles G. (Department: 3746)
Pumps
Including means to prevent foreign material settling from...
By application of separate fluid
C417S312000, C417S534000
Reexamination Certificate
active
06533560
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Techincal Field
The present invention relates to an electromagnetic oscillating type pump and a method for manufacturing the same. More particularly, the present invention relates to an electromagnetic oscillating type pump which is mainly utilized for suction and discharge of air of indoor type air mattresses or airbeds, for supplying oxygen to fish-farming aquariums or purifying tanks for domestic use as well as for sampling gas for examination purposes in monitoring pollution.
2. Discussion of Related Art
An example of a conventionally known electromagnetic oscillating type pump is a diaphragm type pump as illustrated in
FIG. 39
which utilizes magnetic interaction between electromagnets and permanent magnets wherein suction and discharge of fluid is performed by utilizing oscillating force of an oscillator provided with such permanent magnets.
This pump comprises an electromagnetic portion composed of electromagnets
151
disposed as to oppose each other, an oscillator
153
having permanent magnets
152
, diaphragms
154
connected to both ends of the oscillator
153
, diaphragm bases
154
a
and pump casings
155
respectively fixed to both end sides of the electromagnetic portion, and a pump compressing chamber
156
formed between the diaphragm
154
and the pump casing
155
. Each electromagnet
151
is assembled by installing a wound coil portion
158
around an E-shaped iron core
157
, and the oscillator
153
is disposed in a clearance portion
159
formed between the iron cores
157
.
Suction and discharge of air is performed in an alternating manner on the right and left of the pump, being affected by changes in capacity of the pump compressing chamber
156
to increase and decrease contrarily on the right and left owing to oscillation of the oscillator
153
supported by the diaphragms
154
.
However, there is presented a drawback with such a conventional type pump that it is difficult to secure a specified dimension for the clearance portion at the time of assembling the electromagnetic portion since specified positions for the iron cores are shifted. It is also quite costly when housing the pump in a separate sound isolating case to insulate noise arising from the pump portions. It is also difficult to improve productivity since three parts, namely the electromagnetic portion, the diaphragm base and the pump casing, need to be assembled.
An alternative pump is a pump as illustrated in
FIG. 40
comprising two sets of casings
203
,
204
for supporting a diaphragm
201
while forming a pump chamber
202
, an oscillator
205
connected to the diaphragm
201
, an electromagnetic portion
207
comprising electromagnets
206
, a filter holding portion
208
, and an air tank
209
. A cylindrical body
210
is attached between the casings
203
,
204
by means of screws
210
a
, and a pump main body
211
is formed by accommodating the electromagnetic portion
207
in the cylindrical body. The pump main body
211
is accommodated in a housing
212
with the filter holding portion
208
being fitted into an upper portion of the housing
212
while the air tank
209
is attached to its lower portion by means of screws
212
a.
This pump also utilizes forced oscillation of the diaphragm
201
so that the pump main body
211
itself is oscillated and thus generates a large noise. Therefore, it has been devised to support the pump main body
211
at the air tank
209
through four stepped cushions
213
to thereby absorb oscillation within the housing
212
.
However, this arrangement of making the pump main body
211
be supported at the air tank
209
by the four stepped cushions
213
makes it troublesome to mount the pump main body
211
, and it is still difficult to satisfactorily absorb the oscillation. There are further presented drawbacks that the housing
212
becomes large-sized in contrast to the pump main body, and that it is difficult to reduce manufacturing cost because the cost for the housing is most expensive among utilized parts.
The present invention has been made in view of the above facts, and it is an object thereof to provide an electromagnetic oscillating type pump exhibiting high acoustic insulating effects while reducing manufacturing costs.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided an electromagnetic oscillating type pump for oscillating diaphragms connected to an oscillator through electromagnetic oscillation of the oscillator with magnetic body by utilizing magnetic interaction between an electromagnetic portion comprising one or a plurality of iron cores and the magnetic body, wherein a frame portion of resin mold is formed by molding resin on an outer surface of the electromagnetic portion.
The electromagnetic oscillating type pump of the present invention is further so arranged that an oscillator formed with a piston is employed in place of the oscillator to which the diaphragms are connected, and that it further comprises a cylinder portion integrally formed with the electromagnetic portion in place of a mounting portion for the diaphragms.
In accordance with the present invention, there is further provided a method for manufacturing an electromagnetic oscillating type pump for oscillating diaphragms connected to an oscillator through electromagnetic oscillation of the oscillator with magnetic body by utilizing magnetic interaction between an electromagnetic portion comprising one or a plurality of iron cores and the magnetic body, wherein the method comprises the steps of assembling the electromagnetic portion by fitting the iron cores forming the electromagnetic portion into a periphery of an iron core positioning tool, disposing the assembled electromagnetic portion into dies with an angular core for insertion formed at a concaved central portion thereof, and injecting resin into a cavity of the dies for molding the resin on an outer surface of the electromagnetic portion.
In accordance with the present invention, there is also provided a method for manufacturing an electromagnetic oscillating type pump for oscillating diaphragms connected to an oscillator through electromagnetic oscillation of the oscillator with magnetic body by utilizing magnetic interaction between an electromagnetic portion comprising one or a plurality of iron cores and the magnetic body, wherein the method comprises the steps of assembling the electromagnetic portion by placing the iron cores forming the electromagnetic portion to a periphery of an iron core positioning tool obtained by adhering soft magnetic bodies with a magnet pinched therebetween, disposing the assembled electromagnetic portion into dies, injecting resin into a cavity of the dies for molding the resin on an outer surface of the electromagnetic portion, and detaching the iron core positioning tool upon completion of molding.
In accordance with the present invention, there is still further provided a method for manufacturing an electromagnetic oscillating type pump for oscillating diaphragms connected to an oscillator through electromagnetic oscillation of the oscillator with magnetic body by utilizing magnetic interaction between an electromagnetic portion comprising one or a plurality of iron cores and the magnetic body, wherein the method comprises the steps of disposing, upon assembly of the electromagnetic portion, the assembled electromagnetic portion into dies with an angular core for insertion formed at a concaved central portion thereof, positioning and fixing the iron cores to the angular core for insertion through a magnetic attraction by applying power to the electromagnetic portion, and injecting resin into a cavity of the dies for molding the resin on an outer surface of the electromagnetic portion.
The method for manufacturing the electromagnetic oscillating type pump of the present invention utilizes an oscillator formed with a piston in place of the oscillator to which the diaphragms are connected, and further comprises a cylinder portion integrally formed with the electromagnetic portion in place of a
Kawasaki Nozomu
Ohya Ikuo
Freay Charles G.
Solak Timothy P.
Techno Takatsuki Co., Ltd.
Ware Fressola Van Der Sluys & Adolphson LLP
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