JPH0531207U - solenoid - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a noise reduction solenoid that reduces the collision noise when the movable iron core of the solenoid hits the fixed iron core by the air damper effect. [Structure] The diameter of the movable iron core that slides in the sleeve is reduced by 50 μ to 100 μ with respect to the diameter of the inner surface of the sleeve,
An air damper effect is provided by slowing the change in the amount of air when the movable iron core moves, using this clearance as a flow passage for air. Further, an O-ring is used on the shaft portion extending outside from the solenoid so that the air inside the solenoid does not flow into and out of the outside (for example, a valve) so that the air damper effect does not affect the outside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for providing an air damper effect of a solenoid.

[0002]

[Prior Art]

 A dry solenoid of this type is shown in FIG. 1 and generally has no O-ring 12.

That is, when the coil 4 is excited, the movable iron core 7 is attracted and moved in the direction of the fixed iron core 6 in the sleeve 14 of the non-magnetic body against the spring 15, and the non-excitation of the coil 4 causes the movable iron core 7 to move. Separated from the fixed iron core 6. At this time, the solenoid can be opened and closed by the shaft 11 if it is fixed to the valve (not shown) by the mountain mounting screw portion 13, for example.

The clearance 8 between the movable iron core 7 and the sleeve 14 is generally set to be larger than 100 μ in diameter so that the eccentricity at the time of assembling the solenoid does not cause a problem such as scraping the inner surface of the sleeve 14 when the movable iron core 7 is moved. ing.

Due to the movement of the movable iron core 7, the volume of air generated between the movable iron core 7 and the fixed iron core 6 changes, and the air passes through the clearance 8 and passes through the front portion of the movable iron core 7 or the clearance of the shaft 11. It flows in and out to the outside (valve part).

As a result, the movable iron core 7 suddenly collides with the fixed iron core 6 and separates to generate noise during solenoid operation.

[0007]

[The purpose of the device]

 The present invention makes the movement of the air by the operation of the movable iron core as slow as possible, eliminates the air flowing in and out from outside the solenoid through the gap of the shaft, and gives the movable iron core an air damper effect and hits the fixed iron core. It is intended to provide a solenoid that softens impact noise and produces a sound deadening effect.

[0008]

[Means of the present invention for solving the problems]

 The sleeve is press-fitted and fixed around the fixed iron core, the bearing of the movable iron core is held by the sleeve, and the O-ring is used on the shaft part to prevent the movable iron core from shifting concentrically, and the clearance between the movable iron core and the sleeve. The diameter is 50μ to 100μ to reduce the air flow passage cross-sectional area, and the O-ring used on the shaft surface prevents the movement of air with the outside to provide an air damper effect and a sound deadening effect. .

[0009]

【Example】

 FIG. 1 is an embodiment solenoid of the present invention, in which the movable iron core 7 and the clear clearance 8 of the sleeve 14 are assembled with a diameter of 50 μ to 100 μ, and the portion protruding to the outside of the shaft 11 and the inside of the mountain mounting screw portion 13 are assembled. An O-ring 12 is provided on the inside to prevent air from flowing in and out. Therefore, the movement of the air due to the movement of the movable iron core 7 is slowed down and the air damper effect is brought about, so that the silencer solenoid can be realized. Further, the air inside the solenoid does not pass through the gap of the shaft 11 and does not affect the external mechanism, for example, the air damper effect on the valve.

[0010]

[Effect of the device]

 As is clear from the above, this type of silencer solenoid has a great effect particularly when it is used for communication devices, OA devices, etc. that reject noise.

[Brief description of drawings]

FIG. 1 Structure diagram of the solenoid of the present invention

[Explanation of symbols] 1 case (magnetic material) 2 end plate (magnetic material) 3 bobbin 4 coil 5 insulating tape 6 fixed iron core 7 movable iron core 8 clearance 9 front case (magnetic material) 10 washer (non-magnetic material) 11 Shaft 12 O-ring 13 Mounting screw part 14 Sleeve (non-magnetic material) 15 Spring

Claims (1)

[Scope of utility model registration request] 1. A fixed iron core press-fitted and fixed to one end of a magnetic case containing a coil, and an axially non-magnetic cylindrical sleeve fixed to the circumferential surface of the fixed iron core. In a solenoid having a movable iron core arranged so as to be movable in the axial direction facing the fixed iron core end surface, and a shaft fixed to the movable iron core protruding to the outside, the inner circumferential surface of the cylindrical sleeve. The clearance between the diameter of the movable iron core and the diameter of the movable iron core is 50 μ or more and 100 μ or less, and the shaft portion protruding from the solenoid is O-ring,
A solenoid characterized in that gas outside the solenoid is prevented from flowing into or out of the void inside the solenoid.