Duty driven solenoid valve

Details Duty driven solenoid valve Duty driven solenoid valve

2000-01-27

2000-12-19

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

25112901, H01F 300

Patent

active

061632392

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a solenoid valve, and more particularly, to a duty-driven solenoid valve in which a plunger displaces under the action of driving by a solenoid apparatus in response to an electric signal, thereby variably controlling the flow rate.


BACKGROUND ART

FIG. 6 is a sectional view illustrating a conventional three-way nomally closed type duty-driven solenoid valve as disclosed, for example, in Japanese Unexamined Utility Model Publication No. H7-34,271.
This conventional solenoid valve 100 comprises a main body 101 having a coil 102 wound on the outer periphery thereof and a guide hole 103 provided in the interior thereof, a plunger 105 made of a magnetic material which is slidably inserted into a sleeve 104 engaged with the guide hole 103 of the main body 101, a fixed iron core 106 made of a magnetic material, provided coaxially opposite to this plunger 105, a spring 107 which is provided in contact with the plunger 105 and imparts a force to the plunger 105 in a direction of separating the plunger 105 from the fixed iron core 106, and a rod 108 operably connected integrally to a side opposite to the fixed iron core 106 of the plunger 105.
The main body 101 is provided integrally with a valve body 101A. The valve body 101A comprises a ball 109 serving as the valve, an input side and a discharge side valve seats 110a and 110b with and from which the ball 109 comes into contact and is separated, an input port 111 for inputting a fluid pressure into the input side valve seat 110a, and an output port 112 for putting out the fluid pressure to outside. A throughhole is pierced in the fixed iron core 106 at the axial center position, to form a discharge port 113. A shim 114 made of a nonmagnetic material is provided between the plunger 105 and the fixed iron core 106.
In this solenoid valve 100, in a state in which current is fed to the coil 102, the force imparted by the spring 107 acts to press the plunger 105 in a direction toward the discharge side valve seat 110b. The plunger 105, guided by the sleeve 104, slides in the direction toward the discharge side valve seat 110b. Along with displacement of the plunger 105, the rod 108 moves toward the input side valve seat 110a, to bring the ball 109 into contact with the input side valve seat 110a. The input port 111 is thus closed to achieve communication between the output port 112 and the discharge port 113.
When current is fed to the coil 102, a magnetic attracting force acts to attract the plunger 105 toward the fixed iron core 106 against the force imparted by the spring 107. The plunger 105, guided by the sleeve 104, slides toward the fixed iron core 106. Along with displacement of the plunger 105, the rod 108 moves in a direction leaving the input side valve seat 110a. The fluid pressure acts from the input port 111 to the ball 109 which leaves the input side valve seat 110a and comes into contact with the discharge side valve seat 1110b. The discharge port 113 is thus closed, thus achieving communication between the input port 111 and the output port 112.
By thus controlling the power to the coil 102, opening/closing operation of the channel is accomplished. Pressure of the output port 112 varies as shown in FIG. 9 by changing the ratio of power fed to the coil 102, i.e., driving ratio (duty %). It is thus possible to control the pressure of the output port 112 to a prescribed pressure by controlling the driving ratio.
When the plunger 105 is magnetically attracted toward the fixed iron core 106 through feeding of power to the coil 102, the plunger 105 comes into contact with the fixed iron core 106 via the shim 114. At this point, there is a gap corresponding to the shim 114 thickness between the plunger 105 and the fixed iron core 106. When feeding of current to the coil 102 is discontinued, therefore, the effect of a residual magnetic flux retaining the plunger on the fixed iron core 106 side is reduced, and the plunger 105 is caused to rapidly move in a direction leaving the fixed iron core 106 by the forc

REFERENCES:
patent: 5000420 (1991-03-01), Hendrixon et al.
patent: 5075584 (1991-12-01), Hendrixon et al.
patent: 5556175 (1996-09-01), Hayakawa et al.
patent: 5915416 (1999-06-01), Okazaki et al
patent: 6027037 (2000-02-01), Murakami et al.

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