Valves and valve actuation – Electrically actuated valve – Including solenoid
Reexamination Certificate
2001-12-24
2004-04-13
Mancene, Gene (Department: 3754)
Valves and valve actuation
Electrically actuated valve
Including solenoid
C251S331000, C251S335200, C277S640000
Reexamination Certificate
active
06719268
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a solenoid-operated valve which makes it possible to improve the durability of a diaphragm by reducing the load applied to a root portion of the diaphragm for opening/closing a fluid passage.
2. Description of the Related Art
Solenoid-operated valves have been hitherto used, for example, for controlling the flow direction of the compressed air by supplying the compressed air to an actuator or discharging the compressed air to the atmospheric air. The solenoid-operated valve generally adopts the system in which a valve plug is operated by a solenoid (electromagnet).
As shown in
FIG. 4
, such a solenoid-operated valve concerning the conventional technique comprises a coil housing
4
which includes a fixed iron core
1
, a coil
2
, and a movable iron core (plunger)
3
arranged therein, and a valve body
8
. The valve body
8
is arranged with a diaphragm
7
for opening/closing a valve seat
6
to make communication between a pair of fluid inlet/outlet ports
5
a
,
5
b
(see Japanese Laid-Open Patent Publication No. 3-61776).
The diaphragm
7
has a thick-walled section
7
a
seated on the valve seat
6
, and a thin-walled section
7
b
formed integrally with the thick-walled section
7
a
. A peripheral edge of the thin-walled section
7
b
is secured to a recess
9
of the valve body
8
.
In this arrangement, when the electric power is applied to the coil
2
, the attracting force is generated. The movable iron core
3
is displaced by the attracting force, and thus the diaphragm
7
is operated.
However, in the conventional solenoid-operated valve described above, whenever the diaphragm
7
is displaced integrally with the movable iron core
3
by the magnetically exciting action exerted on the coil
2
or the non-exciting action, the excessive load is applied to the vicinity (root portion) of the peripheral edge secured to the recess
9
of the valve body
8
. Therefore, the durability of the diaphragm
7
is extremely deteriorated.
Further, it is preferable to increase the response speed of the solenoid-operated valve by enhancing the attracting force of the coil
2
by increasing the magnetic flux density brought about by the coil
2
.
SUMMARY OF THE INVENTION
A general object of the present invention is to provide a solenoid-operated valve which makes it possible to improve the durability of a diaphragm by smoothly operating the diaphragm by reducing the load applied to a root portion of the diaphragm for opening/closing a fluid passage.
A principal object of the present invention is to provide a solenoid-operated valve which makes it possible to increase the response speed by enhancing the attracting force of a coil to be exerted on a movable iron core.
The above and other objects, features, and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which a preferred embodiment of the present invention is shown by way of illustrative example.
REFERENCES:
patent: 4171792 (1979-10-01), Bass
patent: 4304391 (1981-12-01), Yamaguchi
patent: 4930747 (1990-06-01), Nakamura
patent: 5535987 (1996-07-01), Wlodarczyk
patent: 6006728 (1999-12-01), Matsuda et al.
patent: 6073908 (2000-06-01), Koga et al.
patent: 6352144 (2002-03-01), Brooks
patent: 1 196 032 (1965-07-01), None
patent: 295 13 047 (1995-12-01), None
patent: 3-61776 (1991-03-01), None
patent: WO 98/22727 (1998-05-01), None
Fukano Yoshihiro
Uchino Tadashi
Buechner Patrick
Guss Paul A.
Mancene Gene
SMC Kabushiki Kaisha
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