JPH0138385Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic-encased solenoid valve, and more particularly to a solenoid valve that improves the sealing performance of a joint.

Waterproofness is one of the important characteristics of solenoid valves, especially those used in outdoor equipment and automobiles, due to their usage conditions.
This is even more important for solenoid valves installed in the engine compartment of automobiles.

In order to improve this waterproof property, a waterproof cover is provided on the solenoid valve, but there are drawbacks such as increased size and cost, and a method has been proposed in which the coil portion and the like are covered with plastic material.

However, in this method, although the waterproofness of the exterior part is greatly improved, there is a gap between the covered material and the exterior material, and moisture that enters through this gap can cause
There was a problem in which the insulation of the lead wire part where the insulation part was peeled off and the connection process was performed was reduced.

The present invention provides a structure that prevents water intrusion and a decrease in insulation resistance.The present invention provides a structure that prevents water intrusion and a decrease in insulation resistance, and increases the resistance of the ingress path by providing a plurality of acute-angled unevenness at the combined joint of the covering material and exterior material. be.

FIG. 1 is a longitudinal cross-sectional view of a plastic-encased solenoid valve according to the present invention, in which 1 is a solenoid valve, 2 is a bobbin member, 3 is a passage member that is opened and closed by the action of electromagnetic force, and 4 is a passage member that is connected to the bobbin member 2. A wound coil, 5 a lead wire that supplies power to the coil 4 from the outside, 6 a movable body with a valve at its tip to open a flow path attracted by electromagnetic force, 7 a winding of the coil 4 and a lead wire 5 8 is an exterior end portion of the exterior member which is the end portion of the exterior member, and 9 is a case of the coil portion which also serves as a magnetic path material.

The solenoid valve 2 is exactly the same as a general one, and when a current is passed through the coil 4 through the lead wire 5, an electromagnetic attractive force is generated, and the movable body 6 moves in the direction of opening the valve seat provided in the flow path member. and open a fluid passage. When the current is cut off, the electromagnetic attractive force disappears and the movable body 6 is seated on the valve seat by the spring.

The windings of the coil 4 and the lead wires 5 are each insulated with enamel, plastic, etc., but the insulator is peeled off at the connection portions to electrically connect the conductor portions.

To protect this joint, the exterior is covered with electrically insulating plastic.

In the case of solenoid valves for outdoor equipment or automobile engine compartments, if rainwater, etc. scatters and adheres to the aforementioned plastic exterior member or exterior end, the passage member 3 and the plastic exterior member may be damaged. Since there is a small gap at the end, moisture will penetrate into the electrical connection section described above through this gap.

In some cases, water infiltration lowers the insulation resistance of electrical connections, causing problems such as heat generation and corrosion, which causes wire breakage.

In the present invention, a plurality of acute-angled uneven portions are provided at the contact portion between the channel member 3 having this gap and the exterior end 8, which is the exterior material, to lengthen the passage length and increase resistance to moisture. This is to prevent infiltration.

In order to further increase the waterproofing effect, the above-mentioned gap existing between the two should be blocked in the middle, and this method can be achieved by the method shown in FIG.

FIG. 2 shows an exterior end portion 8 of an exterior member made of a channel member 3 which is a covered material and a plastic material which is a covering material.
This is an enlarged view of the joint with the flow path member 3, with a convex portion having an acute-angled tip portion formed on the flow path member 3 side, and a concave portion formed on the exterior end portion 8 side.

When making an exterior using a plastic material, the semi-finished product that has undergone the coil winding and lead wire connection processes is placed in a mold of a plastic exterior molding machine, and the outside of the coil and lead wire connection section is placed in the mold of a plastic exterior molding machine. Although it is integrally formed with a plastic exterior,
At this time, the plastic sheathing material in a high temperature molten state comes into contact with the tip of the protrusion provided on the channel member 3 side,
Due to the acute angle shape, the tip portion, which has a small heat capacity, is melted and the channel member 3 and the exterior material are welded together.

By welding the tip of the convex portion on the flow path member 3 side, a minute gap that becomes a passage for moisture intrusion is closed in the middle, making it possible to completely prevent moisture intrusion.

In this way, the present invention has the effect of providing a reliable waterproof structure without making any major changes in the shape of the covered material or the covering material.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a plastic-clad solenoid valve showing an embodiment of the present invention, and FIG. 2 is an enlarged view of a joint portion of a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Solenoid valve, 2... Bobbin member, 3... Channel member, 4... Coil, 5... Lead wire, 6... Movable body, 7... Connection part exterior member, 8... Exterior end ,
9...Case.

Claims (1)

[Scope of utility model registration request] A bobbin member partially provided with a flow path, a coil wound around a part of the bobbin member, and a valve mover disposed inside the bobbin and operated in response to excitation of the coil. In the electromagnetic valve equipped with the above-mentioned solenoid valve, a connection portion between the coil wound around the bobbin and the lead wire is integrally formed by covering with an exterior member made of plastic, and a joint portion of the bobbin member is formed at the end of the exterior. 1. A plastic-exposed solenoid valve characterized in that a plurality of convex and convex portions are provided on the bobbin member, and the plurality of convex and convex portions are shaped as acute-angled convex portions on a bobbin member side.