JP2518364Y2 - Latching solenoid - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention relates to a shutoff valve for gas equipment, an O
The present invention relates to a latching solenoid used for holding a magnetic head of a device A and the like.

[0002]

2. Description of the Related Art Conventionally, as a latching solenoid of this type, as shown in FIG. 2, a coil 4 wound around a cylindrical bobbin 3 having an upper brim 12 and a lower brim 13 and the inside of the bobbin 3 are slid. It is composed of a moving plunger 1, a permanent magnet 2 that attracts and holds the plunger 1, an outer peripheral yoke 6 that forms a magnetic circuit, an inner yoke 5, and a columnar yoke 8. The structure of the magnetic circuit is such that the inner yoke 5 and the permanent magnet 2 are arranged outside the inner yoke 5 in contact with the upper brim of the bobbin 3 around which the coil 4 is wound, and directly below the plunger 1 arranged inside the bobbin 3. The cylindrical yoke 8 is arranged in the. An outer peripheral yoke 6 is arranged so as to surround the permanent magnet 2 and the coil 4.

The operation of the plunger of the latching solenoid is such that when the coil is not energized, the plunger is held by the attraction of the magnetic force of the permanent magnet, and a magnetic flux is generated in the coil in the direction opposite to the direction of the magnetic flux of the permanent magnet. When energized in the flowing direction, the attraction force of the permanent magnet becomes small, and the force of the spring 11 shown in FIG. 2 attached to the plunger from the outside pulls the plunger to move it in the pulling direction 10 shown in FIG. When the coil is energized in the opposite direction, the plunger is attracted by the magnetic force generated in the coil, moves in the attraction direction 9 and returns to its original position.

[0004]

In the conventional latching solenoid, when the plunger is attracted by the magnetic force generated in the energized coil and returns to its original position, the cylindrical yoke is arranged directly below the plunger. Moreover, there is a problem that an impact sound is generated due to the contact of the plunger.

An object of the present invention is to provide a latching solenoid having a magnetic circuit in which the plunger of the latching solenoid does not come into contact with the yoke when the plunger of the latching solenoid is attracted and returns to its original position, and an impact noise is not generated. There is.

[0006]

In order to achieve the above object, in the latching solenoid of the present invention, a plunger sliding inside the bobbin is provided directly below the plunger so as to be movable through an inner diameter portion of the bobbin. Remove the existing cylindrical yoke, contact the lower brim of the bobbin around which the coil is wound, arrange the inner yoke inside, arrange the permanent magnet outside the inner yoke, and connect the permanent magnet, inner yoke and coil. A magnetic circuit is formed by arranging an outer peripheral yoke having a through hole larger than the diameter of the plunger so as to surround it.

That is, the latching solenoid of the present invention is
A coil wound in a cylindrical bobbin, a plunger that slides inside the bobbin, a permanent magnet that attracts and holds the plunger, and a yoke that forms a magnetic circuit. The inner yoke and a permanent magnet are arranged outside the inner yoke in contact with the lower brim of the bobbin, and a through hole having a size larger than the diameter of the plunger is provided at the tip of the plunger so as to surround the inner yoke, the permanent magnet, and the coil. And a plunger sliding inside the bobbin to form a magnetic circuit that does not come into contact with the yoke during operation.

[0008]

When the coil of the latching solenoid configured as described above is energized so that the magnetic flux flows in the same direction as that of the magnetic flux of the permanent magnet, the magnetic force generated in the coil causes the plunger to be attracted to the coil and the direction of attraction. However, since the bobbin is in a penetrating state, there is no conventional cylindrical yoke with which the plunger comes into contact, so no impact noise is generated. Further, since the permanent magnet is arranged in contact with the lower collar of the bobbin under the coil, the tip of the plunger is held by the attraction force of the permanent magnet at the position where the permanent magnet is arranged.

[0009]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a sectional view showing the structure of a latching solenoid of the present invention. In FIG. 1, a coil 4 wound around a cylindrical bobbin 3 having an upper brim 12 and a lower brim 13, a plunger 1 sliding inside the bobbin 3, and a permanent magnet 2 attracting and holding the plunger 1. It is composed of an outer yoke 6 and an inner yoke 5 that form a magnetic circuit. The magnetic circuit is configured such that the inner yoke 5 and the permanent magnet 2 are arranged outside the inner yoke 5 in contact with the lower flange 13 of the bobbin 3 around which the coil 4 is wound, and the permanent magnet 2, the inner yoke 5 and the coil 4 are connected to each other. An outer peripheral yoke 6 having a through hole 7 through which the tip of the plunger 1 having a size larger than the diameter of the plunger 1 is arranged so as to surround it.

[0010]

Since the present invention is constructed as described above, it has the following effects. At the tip of the plunger inside the bobbin where the sliding plunger is arranged, there is no cylindrical yoke that was conventionally arranged, and since the inside of the bobbin forms a magnetic circuit in the penetrating state, Even if the plunger moves in the direction,
Since there is no contacting portion, it is possible to provide a latching solenoid that does not generate impact noise and that has a silenced magnetic circuit.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a latching solenoid of the present invention.

FIG. 2 is a sectional view showing the configuration of a conventional latching solenoid.

[Explanation of symbols]

 1 Plunger 2 Permanent magnet 3 Bobbin 4 Coil 5 Inner yoke 6 Outer peripheral yoke 7 Through hole 8 Cylindrical yoke 9 Suction direction 10 Tension direction 11 Spring 12 Upper brim 13 Lower brim

Claims (1)

(57) [Scope of utility model registration request] 1. A latching solenoid including a coil wound around a cylindrical bobbin, a plunger sliding inside the bobbin, a permanent magnet attracting and holding the plunger, and a yoke forming a magnetic circuit. , The inner yoke and a permanent magnet are placed outside the inner yoke in contact with the lower brim of the bobbin around which the coil is wound, and the end of the plunger is surrounded by the diameter of the plunger so as to surround the inner yoke, the permanent magnet and the coil. A latching solenoid, wherein an outer peripheral yoke having a large-sized through hole is arranged, and a plunger that slides inside the bobbin forms a magnetic circuit that does not come into contact with the yoke during operation.