Fluid handling – With means for separating solid material from the fluid – Planar strainer normal to flow path
Patent
1997-05-05
2000-06-20
Lee, Kevin
Fluid handling
With means for separating solid material from the fluid
Planar strainer normal to flow path
251 38, 251 3003, 335255, 335281, H01F 716, F16K 31365
Patent
active
06076550&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a solenoid and a solenoid valve.
BACKGROUND ART
A solenoid valve driving a plunger is provided with an electromagnetic coil encapsulated in a yoke. A longitudinal hole is formed at the center of the electromagnetic coil and a cylindrical plunger guide is mounted in the longitudinal hole. Further, a pole core is fixedly fitted to the upper portion of the plunger guide and the plunger moving relative to the pole core is abrasively inserted into the plunger guide. Also, a bleed hole communicating with water supply source and a pilot hole communicating with the secondary side of water supply are installed to a diaphragm provided to a diaphragm valve.
According to such a structure, the outer shell of a solenoid is formed by the yoke, a lower end plate thereof and a pole core fixing plate to which the pole core is fixed. Further, the plunger is operated movably to and from a through hole at a yoke lower end plate by receiving a magnetic sucking action caused by the electromagnetic force generated by conducting electricity to the electromagnetic coil. Thereby, the diaphragm valve is opened and closed by opening and closing the pilot hole of the diaphragm in accordance with the movement of the plunger.
The field of use of a solenoid valve for water supply control has been diversified in recent years and, for example, the valve is adopted in water related devices in general life such as an automatic cock, a privates washing device and the like. Hence, reduction in cost and further downsizing have been desired by the market.
However, there is a limitation in dealing with the downsizing according to the above-described structure and there are various hazards in achieving the further downsizing thereof.
That is, in downsizing a solenoid valve, plunger stroke or diaphragm area may be reduced in order to simply downsize it. However, it is known that handling performance of a solenoid valve for water supply control is deteriorated unless it is used normally under a hydraulic pressure of 0.5 through 10 kg/cm.sup.2 and a flow rate of approximately 20 liter per minute is ensured even under aminimum hydraulic pressure of use.
Therefore, there is a limitation in decreasing the plunger stroke or the diaphragm area. On the other hand, if other constitutions are to be reconstructed, deterioration in the function, or deterioration in the water proof function may be caused. Therefore, it is extremely difficult to achieve downsizing exceeding the current state while maintaining the function.
It is an object of the present invention to provide a solenoid and a solenoid valve capable of solving the above-described problem.
DISCLOSURE OF THE INVENTION
In order to resolve such a problem, a solenoid and a solenoid valve of the present invention are provided with the following constitutions.
That is, according to a solenoid of a first invention, there is provided solenoid for driving a plunger, comprising: nonmagnetic material for defining a moving region in which the plunger is moving, and a coil winding portion wound around the region-defining member to generate a magnetic field of a first magnetic flux path penetrating the moving region along a direction of moving of the plunger, the electromagnetic coil exerting a magnetic force of the first magnetic flux path on the plunger; arranged at an external side of a partitioning face formed to partition the moving region and on an end side of the region-defining member opposed to the plunger, the irregular magnetic field forming member forming a second magnetic flux path of the magnetic field formed by the electromagnetic coil at the external side of the partitioning face from the end side of the region-defining member, the irregular magnetic field forming member exerting a magnetic force of the second magnetic path from a top end of the irregular magnetic field forming member on the plunger via the partitioning face; and to arrange one of the irregular magnetic field forming members on the end side of the region-defining member oppose
REFERENCES:
patent: 4290039 (1981-09-01), Tochizawa
patent: 5217200 (1993-06-01), Hutchings et al.
patent: 5259416 (1993-11-01), Kunz et al.
patent: 5363873 (1994-11-01), Richmond
patent: 5573224 (1996-11-01), Kim
Hiraishi Kazuo
Houei Taisuke
Kawahara Katsuhiro
Koga Itsunao
Matsufuji Takanobu
Lee Kevin
Toto Ltd.
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