Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Reexamination Certificate
2000-02-07
2002-10-29
Barrera, Ramon M. (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
C335S281000, C335S297000
Reexamination Certificate
active
06472968
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an iron core and an electromagnetic driving mechanism employing the iron core. More particularly, the present invention relates to an iron core employed in, for instance, an electromagnetic oscillating type pump of diaphragm type or piston type, and an electromagnetic driving mechanism employing the iron core, which can improve the thrust of an oscillator disposed between electromagnets disposed in an opposing manner.
2. Description of the Related Art
Electromagnetic type pumps are conventionally used mainly for supplying oxygen to fish-farming aquariums or purifying tanks for domestic use and for sampling gas for inspection to observe pollution. Such a pump comprises, as shown, for example, in
FIG. 23
, electromagnets
101
disposed in an opposing manner, an oscillator
103
having permanent magnets
102
, diaphragms
104
coupled to both ends of the oscillator
103
, pump casings
105
fixed at both ends of the electromagnets
101
, and a pump compressing chamber
106
formed between the diaphragm
104
and the pump casing
105
. Each of the electromagnets
101
is finished by assembling a wound coil
108
in an E-shaped iron core
107
, and the oscillator
103
is disposed in an air gap
109
formed between the iron cores
107
.
In such a pump, oscillation of the oscillator
103
which is supported by the diaphragms
104
causes an increase/decrease in a capacity of the pump compressing chamber
106
in a deflective manner on the right and left, whereby suction and discharge of air is alternately performed on the right and left.
In a conventional pump, thrust in right and left directions F
1
, F
2
of the oscillator
103
can be achieved by suction force between a pole portion
110
a
of a side pole
110
of each iron core
107
and the permanent magnet
102
as well as that between a pole portion
111
a
of a center pole
111
and the permanent magnet
102
, as shown in FIG.
24
and in FIG.
25
.
At this time, there are respectively generated on a magnetic field formed between the iron cores
107
and the permanent magnets
102
a magnetic path A of a closed-circuit type which is formed by the side pole
110
, center pole
111
outer yoke
112
and permanent magnets
102
and a magnetic path B of closed-circuit type which is formed by the center pole
111
and permanent magnets
102
.
However, the magnetic path B presents a drawback in that it limits the thrust of the oscillator because it causes short-circuiting of magnetic flux of the permanent magnets
102
.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided an iron core comprising an outer yoke, side poles disposed on both end portions of the outer yoke, and a center pole disposed between the side poles, wherein a magnetic path of pole portions of the center pole is formed as an open-circuit.
The center pole is preferably formed of a pair of magnetic poles which are separated from each other by a specified distance.
In accordance with the present invention, there is further provided an electromagnetic driving mechanism comprising electromagnets each composed of the iron core and a winding coil which is wound around pole portions of the iron core, and an oscillator with a pair of permanent magnets disposed in an air gap within the electromagnets and separated from each other by a specified distance, wherein outer shape of the pair of permanent magnets which are directly attached to a shaft assume a square or circular shape, and a polarity of the pair of permanent magnets in a peripheral direction is magnetized to be an anisotropic magnetic pole.
REFERENCES:
patent: 2925538 (1960-02-01), Rasmusen
patent: 4700165 (1987-10-01), Brisson et al.
patent: 5013223 (1991-05-01), Takahashi et al.
patent: 5104298 (1992-04-01), Takahashi et al.
patent: 5808537 (1998-09-01), Kondo et al.
Armstrong Westerman & Hattori, LLP
Barrera Ramon M.
Techno Takatsuki Co., Ltd.
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