JPH0212363Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil-immersed solenoid used in a hydraulic solenoid valve.

The oil-immersed solenoid has a plunger guide 2 inserted into the center of the solenoid 1 as shown in Figure 1.
A fixed iron core 3 is provided at one end, a stopper member 4 is fixed at the other end, and a plunger 5 is movably inserted into the plunger guide.
The inside of the guide is formed by sealing oil, but when sealing oil, it is necessary to extract the air from inside the plunger guide in order to seal it completely. It is necessary to provide an air venting function. It is also necessary to provide a push button for manually operating the plunger 5.

For this reason, in conventional oil-immersed solenoids,
A push button 41 is provided at the center of the stopper member in alignment with the extension of the axis of the plunger, and an air vent hole 42 is provided at the upper position, into which an air vent screw 43 is screwed. Therefore, the stopper member 4 has to become larger, making the entire device larger, and depending on the mounting location and mounting condition, there are often locations where it is difficult to perform the air purge operation. This has resulted in drawbacks such as restrictions on the mounting position and mounting direction of the solenoid itself, and the need to provide air vent holes at multiple locations.

The purpose of the present invention is to address the drawbacks of the conventional oil-immersed solenoid, and to provide an oil-immersed solenoid that eliminates restrictions on the mounting direction and allows the stopper itself to be made compact.

The oil-immersed solenoid of the present invention is characterized by the configuration of a stopper member that is provided with a push button for manual operation and an air vent mechanism. The configuration of the device of the present invention will be specifically explained below with reference to the embodiments shown in the drawings.

In FIG. 2, a plunger guide 2 is inserted into the center of the solenoid 1, and a fixed iron core 3 is fixed to one end of the plunger guide 2.
Further, a plunger 5 is fitted inside. A push button 6 is fitted and inserted into the other end of the plunger guide 2 adjacent to the plunger 5, and a sleeve-shaped stopper member 7 is fixedly attached to the extreme end of the guide 2. .

As shown in FIG. 4, the push button 6 has a plunger abutment part 61 at its tip that has approximately the same diameter as the plunger, and a push shaft 62 that has a smaller diameter than the corresponding part at the rear.
It is a sliding member integrally formed with an air vent hole 63 at the axial center position, and is prevented from coming off by a stopper member 7 after being fitted into the plunger guide. . Further, in order to prevent the push button 6 from rotating in the circumferential direction, a flat part 71 is formed in a part of the part that fits into the stopper member 7, and at the same time, a flat part 71 is formed on the circumferential surface of the plunger contact part 61 of the push button. Parallel chamfered portions 64 are also formed on both sides, and these are fitted together in a combined state as shown in FIG. The push button 6 is connected to the stopper member 7 through an O-ring 65.
It is also fitted with the air vent hole 6 of the push button.
3 is screwed with an air bleed screw 8 with an O-ring 81 to ensure watertightness.

FIG. 5 shows another embodiment of the push button, in which the circumference of the plunger contact portion 61 is octagonal (Figure A) and hexagonal (Figure B).
It is. In the stopper member combined with these push buttons, the inner surface of the sleeve is formed to correspond to the octagonal or hexagonal portions to prevent rotation of the push button. Furthermore, as shown in FIG. 6, key grooves 66 and 72 may be provided in the circumferential portion of the plunger contact portion 61 and the corresponding portion of the stopper member 7, and the key 9 may be fitted therein to prevent rotation. .

According to the present invention, since the stopper member including the push button can be formed in a small size, the entire device becomes small and installation etc. becomes extremely convenient. Furthermore, since the air vent is located on the axis of the solenoid, there is no direction restriction during installation, and operation is always easy together with the push button. Furthermore, since the stopper member is constructed to be attached only to the plunger guide, it is also possible to separate the coil and tube portion. The device of the present invention has the advantage of being structurally highly reliable in terms of oil leakage and being inexpensive to manufacture.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional oil-immersed solenoid, and FIG. 2 is a sectional view of an oil-immersed solenoid according to the present invention.
3 is a partial sectional view taken along the line - in FIG. 2; FIG. 4 is an exploded perspective view showing the engaged state of the stopper member and push button, which constitute the essential parts of the device of the present invention; 5 and 6 are perspective views showing another embodiment of the push button. 1: Coil, 2: Plunger guide, 3: Fixed core, 5: Plunger, 6: Push button,
7: Stopper member, 8: Air vent screw.

Claims (1)

[Scope of utility model registration request] An oil-immersed solenoid having a structure in which a plunger guide inserted into the solenoid has a fixed iron core at one end, a stopper is fitted at the other end, and a plunger is slidably inserted into the plunger guide,
A push button having a screw hole for air venting at the axial center position and having a rotation preventing shape on a part of the circumference and fitted into the stopper so as to be movable in the axial direction; and a push button that is screwed into the screw hole of the push button. An oil-immersed solenoid equipped with an air bleed screw to be inserted and an O-ring to prevent oil leakage between the stopper and the push button and between the push button and the air bleed screw.