Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1990-06-26
1991-09-24
Rosenthal, Arnold
Valves and valve actuation
Electrically actuated valve
Including solenoid
25112908, 251368, 335297, F16K 3106, H01F 716
Patent
active
050508407
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an electromagnet for solenoid valves, which is used to operate a valve body of a solenoid valve, and more particularly to a so-called wet type electromagnet of a structure having a movable core housed in a pipe unit filled with a liquid.
BACKGROUND ART
The electromagnets of this kind for solenoid valves include an electromagnet shown in FIG. 19. Referring to FIG. 19, a valve body B' is attached to a base frame of a machine, for example, a machine tool. An electromagnet A' is fastened to the valve body B' with setting bolts 50' with the electromagnet A' and valve body B' facing each other in a corresponding condition (for example, in such a condition that the positions of plug pins 54 correspond to those of receptacles 54' in the valve body B'). Since the valve body B' is designed in accordance with an object machine, the direction in which the valve body B' attached to a base frame of the machine faces varies. Accordingly, it is possible that the electromagnet A' is fastened to the valve body B' with any of first, second and third surfaces 51, 52, 53 thereof facing in the upward direction. In order that air can be released no matter whichever surface of the electromagnet A' fastened to the valve body B' faces in the upward direction, air vent holes 41' in which packing-carrying plugs 42' are fitted are provided in the portions of a cap E' for the electromagnet A' which correspond to these surfaces 51, 52, 53 respectively.
In this conventional structure, at least three air vent holes 41' mentioned above are required. However, providing a plurality of such air holes in which packing-carrying plugs are fitted costs a great deal to cause the cost of manufacturing an electromagnet for solenoid valves to increase.
DISCLOSURE OF INVENTION
In an operation of combining the electromagnet for solenoid valves according to the present invention with a valve body, a pipe unit, a coil unit and a cap can be put together simply in order.
In this operation, the coil unit is simply fitted around the pipe unit. When the cap formed so as to seal an opened portion of the pipe unit is then tightened by turning the same, the coil unit is pressed by the cap and set firmly. This enables labor for fixing the coil unit to be saved.
According to the present invention, the cap is formed so that it can be turned as mentioned above. Therefore, the present invention has the following effects when air in the pipe unit is released after the completion of the assembling of the electromagnet. In the case where an air vent hole is provided in one portion of a cap and faces in the lateral or downward direction, it is difficult to let out air from a pipe unit. However, the air remaining in the pipe unit in the present invention can be released by turning the cap a little so as to displace an air vent hole to the upper side. This advantageously enables the extra cost, which is required in the production of a prior art electromagnet of this kind, of forming a plurality of air vent hole structures in the cap to be saved, and the cost of manufacturing an electromagnet for a solenoid valve to be reduced.
When the cap in the present invention is turned so as to be loosened, the air vent hole provided in the cap is allowed to communicate with the interior of the pipe unit. When this cap is turned so as to be tightened, the air vent hole is displaced to the outer side of a packing, so that the air vent hole is shut off from the interior of the pipe unit. Therefore, it is unnecessary to provide the air vent hole with an opening and closing structure. This enables the air vent hole structure to be simplified. The advantage thus achieved constitutes a very profitable solution to the problems in a conventional electromagnet of this kind in which the air vent hole sealing structures incur a lot of expenses.
In the electromagnet according to the present invention, the forward and backward movements of a movable core are guided stably by a pipe. Accordingly, the loci of the forward and backward movements of the
REFERENCES:
patent: 3791408 (1974-02-01), Saitou et al.
patent: 4725039 (1988-02-01), Kolchinsky
patent: 4919390 (1990-04-01), Ichiryu et al.
Kondo Yusuke
Nakamura Shinji
Rosenthal Arnold
Sanmeidenki Kabushikikaisha
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