JPS5932088Y2 - solenoid - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a solenoid used in a solenoid valve, etc. It provides a solenoid that has an extremely simple configuration, can obtain a large electromagnetic force with low power consumption, and can therefore be miniaturized. This is what I am trying to do.

Hereinafter, an embodiment of the present invention will be described in detail based on the drawings. In FIG. 1, an excitation coil 2 wound around a bobbin 1 has magnetic frames 3 and 4 forming a magnetic path on the outside thereof. A fixed core 5 is directly fitted and fixed to one end of the shaft hole 1a at the center of the bobbin 1, and a movable core 5 is attached to the other end of the shaft hole 1a to be attracted to the fixed core 5 when the coil 2 is energized. An iron core 6 is fitted so as to be slidable in the axial direction.

Thus, the exposed upper end portion of the fixed iron core 5 is fitted onto the top plate portion 3a of the magnetic frame 3.

As shown in FIG. 2, the bobbin 1 includes a lead-like bobbin body 7 made of a non-magnetic material around which a coil 2 is wound, and a magnetic flange-like member 8 for reinforcement and reduction of magnetic resistance as shown in FIG.
It is composed of.

The bobbin body 7 includes a shaft tube portion 7a and flange portions 7b, 7b at both ends thereof, and a magnetic plate 4a forming a part of the magnetic frame 4 is attached to one end of the shaft tube portion 7a. Hole 4
A tube wall 7C inserted through b is extended, and further the tube wall 7C is inserted into the tube wall 7C.
A circumferential groove 7d recessed in the shaft tube portion 7a on the outside of the tube wall 7C is opened in the end face of the flange portion 7b located on the side.

Further, the flange-like member 8 is connected to the circumferential groove 7 of the bobbin body 7.
d, and a flange portion 8b that abuts against the flange portion 7b of the bobbin body 7, and a slit 8C for removing eddy currents is cut in the axial direction of these portions.

The bobbin 1 is constructed by inserting the cylindrical portion 8a of the flange-like member 8 into the circumferential groove 7d of the bobbin body 7, and when the bobbin 1 is installed in the solenoid, the shaft The fixed core 5 and the movable core 6 are directly fitted into the tube portion 7a, and the tube portion 8a of the flange-like member 8 connects the movable core 6 with a part of the wall thickness of the shaft tube portion 7a of the bobbin body 7.
The flange portion 8b of the flange-like member 8 is configured to be in contact with the inner surface of the magnetic plate 4a forming a part of the magnetic frame 4.

The solenoid having the above configuration is biased in a direction away from the fixed core 5 by the movable core 6 or a spring (not shown) when the coil 2 shown in FIG. 1 is not energized, and when the coil 2 is energized , the movable core 6 is attracted to the fixed core 5 against the biasing force of the spring or the like.

In the above solenoid, the cylindrical portion 8a of the flange-like member 8 with the flange portion 8b in contact with the magnetic plate 4a faces the movable iron core 6 at a small distance and over a wide area, so that the magnetic path is The magnetic resistance is reduced and the magnetic flux density is increased, and since the flange-like member 8 is equipped with grooves (8C) cut in the axial direction for removing eddy currents, the supplied power is effectively utilized. 6 and the fixed iron core 5, a large suction force can be obtained with low power consumption.

In addition, since the bobbin body 7 of the bobbin 1 is reinforced by the flange-like member 8, it can also be used as a sliding guide pipe for the movable iron core 6, and therefore, other guide pipes can be inserted into the shaft tube portion 7a of the bobbin body 7. There is no need to insert
The overall size can be reduced, and material costs and processing costs can be reduced.

FIG. 4 shows an exploded state of a bobbin in another embodiment of the present invention. This bobbin 11 is composed of a bobbin body 17 and a pair of flange-like members 18 similar to those shown in FIG. are doing.

The bobbin main body 17 includes a shaft tube portion 17a and flange portions 17b at both ends thereof, and a tube wall 17C extends from one end of the shaft tube portion 17H.
7b.

A circumferential groove 17d recessed in the shaft tube portion 7a is provided on the end surface of 17b.
, 17d are opened.

These circumferential grooves 17d. 17d is a flange-like member 18.
18 (7) Cylindrical portions 18 a , 18 a are inserted into the cylinder portions, and the bobbin 11 is constituted by this.

By using the bobbin 11 configured in this manner, the magnetic resistance in the magnetic path of the solenoid is reduced and the supplied power is effectively utilized by eliminating eddy currents, so that the bobbin 11 is even smaller than the embodiment shown in FIG. It is possible to obtain large electromagnetic force using electricity.

Further, since both ends of the bobbin body 17 are reinforced by the pair of flange-like members 18, 18, it can withstand a larger load.

As described above, according to the solenoid of the present invention, the cylindrical portion of the magnetic flange-like member is axially inserted into the circumferential groove provided in the axial tube portion of the bobbin body, so that the cylindrical portion can be inserted into the axial tube portion. Regardless of the wall thickness of the movable core, it can be opposed to the movable core with a small gap and a wide area, and since the flange part of the flange-like member is in contact with the magnetic frame, magnetic resistance in the magnetic path is reduced. is reduced, the magnetic flux density is increased, and large electromagnetic force can be obtained with low power consumption.Also, since the bobbin body is reinforced with a flange-like member, the movable iron core can be slid directly within the bobbin body. I can,
This not only makes it possible to downsize the solenoid, but also to reduce manufacturing costs. There is no contact between the cylindrical part and the shaft tube part on the sliding surface with the moving iron core, so the movable iron core slides smoothly, and there is no possibility of sliding defects of the movable iron core due to the contact. Therefore, it is not necessary to align the bobbin body and the flange member with high accuracy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is an exploded sectional view of its bobbin, and Fig. 3 is a perspective view of its flange-like member.
FIG. 4 is an exploded sectional view of a bobbin in another embodiment of the present invention. 1.11...Bobbin, 1a...Shaft hole,
2...Coil, 3゜4...Magnetic frame, 5
...Fixed core, 6...Movable core, 7゜17...Bobbin body, 7a, 17a...
・Shaft tube part, 8°18...Flange-like member, 8a
, 18a...Cylinder part.

Claims (1)

[Scope of utility model registration request] A magnetic frame that forms a magnetic path is arranged outside the excitation coil wound around the bobbin, and a fixed iron core is fitted and fixed into the shaft hole located at the center of the bobbin. In the bobbin in which a movable iron core to be absorbed is fitted, the bobbin is composed of a shaft tube section provided with the shaft hole and seven run parts at both ends thereof, and a circumferential groove is recessed in the shaft tube section from the end surface in the axial direction. It consists of a non-magnetic reel-shaped bobbin main body, a magnetic flange-like member for reinforcing and reducing magnetic resistance, consisting of a cylindrical part inserted into the circumferential groove and a flange part connected to one end of the cylindrical part, The fixed iron core and the movable iron core are directly fitted into the axial holes in the tube part, so that the cylindrical part of the flange-like member faces the movable iron core across the thick part of the axial tube part of the bobbin body, and the flange A solenoid characterized in that a flange portion of a shaped member is brought into contact with a magnetic frame.