JPS59163807A - Solenoid - Google Patents

Abstract

PURPOSE:To make an armature move smoothly, improve response and reduce the noise by perforating-through an oil flow gateway hole in the bottom plane of a core. CONSTITUTION:A solenoid is composed of an armature 4, an exciting coil 3 and a core 2 which is so provided as to cover the lower open end and the front and back side of a hollow core of the exciting coil. The armature 4 is so provided as to be able to move vertically in the hollow core of the exciting coil 3. These components are placed in a case 6 filled with oil 5 for insulation and cooling. An oil flow gateway hole 2b which is continuously connected to the hollow core of the exciting coil 3 is drilled in the bottom plane of the core 2. With this constitution, the oil 5 in the exciting coil 3 can be introduced into and discharged out of the coil 3 efficiently through the gateway hole 2b and the armature 4 can smoothly be moved vertically without producing the impact noise.

Description

TECHNICAL FIELD The present invention relates to a solenoid in which an armature, an excitation coil, and a magnetic core are immersed in oil to prevent burnout of the excitation coil and vibration and noise during operation of the armature.

Prior Art The present applicant has filed an application (Japanese Patent Application No. 57-8695) in which the solenoid is immersed in oil in order to prevent burnout of the excitation coil and noise caused by I-pull during operation of the armature.
3) was done first.

The above-mentioned solenoid was more effective than expected, but when operating the armature, for example, when the protruding armature moves instantaneously into the air core of the excitation coil, the oil that has entered the air core of the excitation coil is removed. Since there was no way to escape, the oil caused the problem that the rear armature was unable to move instantaneously due to the recoil force. On the other hand, even when the armature protruded, the flow of mail into the air core of the excitation coil was slow, so the armature could not move instantaneously due to the force of pulling it back.

In order to eliminate these problems, it is possible to increase the force by which the armature moves, but if the force by which the armature moves is increased, the reaction will also increase proportionally, causing the entire solenoid to vibrate violently, or There was a new defect, such as the generation of loud noise.

Purpose This invention was made to solve the above-mentioned problems, and its purpose is to provide a solenoid that allows smooth armature movement, excellent responsiveness, and low noise.

EXAMPLES Hereinafter, examples embodying the present invention will be described with reference to the drawings.

In Figure 1, a solenoid 1 has a magnetic core 2 and an exciting coil 3.
and an armature 4, and is disposed in a case 6 filled with oil 5 for insulation and cooling up to the 4-position indicated by the 2-point 1!4 line. The magnetic core 2 is composed of a large number of concave plate-shaped magnetic core materials stacked one on top of the other, and is held in place by mounting brackets 7 placed on both the left and right sides, and the bottom surface 2a of the core 2 is provided at the center of the bottom surface 2a as shown in FIGS. 4 to 6. J shown: Sea urchin oil inflow/outflow hole 2+1 is transparent. The mounting bracket 7 is attached to the magnetic core 2
The fixing portion 7a at the rear end is fixed to the inner wall of the case 6 with screws 8 so that the bottom surface 2a of the case 6 is located above the bottom surface 6a of the case 6.

The excitation coil 3 is disposed in the recess 2c of the magnetic core 2, and the air core 3a communicates with the oil inflow/outflow hole 21).

A rectangular cylindrical frame 9 is disposed in the air core 3a of the excitation coil 3, and two ends of the frame 9 extend to the upper surface of the magnetic core 2.

Inside the frame 9, that is, in the air? '5113 The armature 4, which is disposed in a vertically movable manner, is a T-shaped plate 1! It is composed of a large number of +11 and 1 stacked on top of each other, and is held in place by handle plates 10 placed on both the left and right sides.

The armature 4 is moved up and down based on whether the excitation coil 3 is energized or de-energized. The movable rod 11 has a lower end attached to a support shaft 12 between the upper ends of the pair of left and right mounting plates 10.
The flexible cover 13 is rotatably connected to the flexible cover 13, and its negative end is exposed from the upper part of the flexible cover 13 attached to the upper peripheral edge of the case 2.

Next, the operation of the solenoid 1 configured as above J: will be explained.

Now, when the armage 17-4 is pulled from the upwardly protruding state shown in FIG. 6 to the downward position shown in FIG. The armature 443 is moved down smoothly (without making any impact noise) because it is efficiently taken out through the inlet hole 2b.

On the other hand, when the armature 4 is moved upward as shown in FIGS. 5 to 6, the oil in the case 6 flows into the air core 3a through the oil inflow and outflow holes 2b, so that the same effect as described above occurs. The armature 4 is moved upward smoothly and without making any impact noise.

Note that this invention is not limited to the above embodiments,
For example, the shape or the position of the oil inflow/outflow hole may be changed as appropriate depending on the various solenoids, or other changes may be made as appropriate without departing from the spirit of the present invention.

Effects As detailed above, the present invention includes an armature, an excitation coil disposed inside the armature so as to be movable in the vertical direction, and an excitation coil that covers the lower mouth end of the air center and both front and rear sides of the excitation coil. In the solenoid, the solenoid is composed of a magnetic core arranged so that the magnetic core is immersed in oil. This solenoid is excellent as a solenoid, with smooth movement of the armature, excellent responsiveness, and the ability to minimize the occurrence of buzzing noise.

[Brief explanation of the drawing]

FIG. 1 is a front view of a solenoid immersed in oil embodying the present invention, FIG. 2 is a side view of the solenoid, FIG. 3 is a perspective view, FIG. 4 is a top view of the solenoid, and FIG. This figure and FIG. 6 are front sectional views of the solenoid for explaining the action of the solenoid. Solenoid 1, magnetic core 2, oil inlet/outlet hole 2b, excitation coil 3, air core 3a, armature 4, oil 5, case 6, movable rod 11, spindle 12, flexible cover 13゜Patent tH Kandai Fuji Pack Co., Ltd. System fee
Attorney Patent Attorney On 1) Hironobu-〇- Figure 1 Momo] 7a Figure 6 11 10 Z ba

Claims (1)

[Scope of Claims] 1. An armature, an excitation coil disposed such that the armature can be moved vertically in an air core, and an excitation coil disposed so as to cover the lower end of the air center and both front and rear sides of the excitation coil. What is claimed is: 1. A solenoid comprising a magnetic core which is immersed in oil, characterized in that an oil inflow/outflow hole communicating with an air core portion of the magnetic core coil is provided in a bottom surface of the magnetic core.