JPS6116653Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to a solenoid used in a solenoid valve that switches the direction of fluid flow using electromagnetic operating force.

PRIOR ART

Conventionally, a pair of magnetic frame pieces made by bending plate materials into a U-shape are combined by overlapping their end plate parts, and a hole for preventing eddy current is inserted into a hole provided in the overlapping part of the end plate part. A slotted magnetic frame of a solenoid is known, for example, from German Patent Application No. 1489622.

The above-mentioned known magnetic frame has the advantage that the magnetic frame can be constructed by a simple sheet metal process of bending the plate material, but since the plate material to be bent is T-shaped or H-shaped in plan view, the plate There is a disadvantage that it is troublesome to fix the magnetic frame and the coil when assembling the solenoid because there is a lot of waste in removing the magnetic frame and there is no means for fixing the magnetic frame and the coil disposed within the magnetic frame. Ta.

[Problem that the invention attempts to solve]

The present invention utilizes eddy current prevention slits cut into the end plates of the magnetic frame for fixing the coil to the magnetic frame, thereby making it possible to fix the magnetic frame and the coil by a simple means. This is a problem that must be solved.

[Means for solving problems]

The present invention combines a pair of magnetic frame pieces of the same shape, which are made by bending plate material into a U-shape and integrally connecting end plate parts at both ends of the side plate part, by overlapping the end plate parts. A magnetic frame, a coil provided within the magnetic frame, a fixed core attached to the magnetic frame and disposed within the coil, and a magnetic frame that is attracted to the fixed core and slides in the axial direction when the coil is energized. In a solenoid consisting of a moving movable iron core, the plate material is approximately rectangular, and the eddy current is cut from the hole for inserting the fixed iron core provided at the overlapping part of the end plate part to the center of the tip of the end plate part. The above problem was solved by fixing the magnetic frame and the coil by fitting the protrusions provided on both the upper and lower plates of the bobbin of the coil into the preventive slit.

[Effect]

Insert the protrusion provided on one of the upper and lower plates of the coil bobbin into the slit cut in the end plate of one magnetic frame piece, and then insert the other magnetic frame piece from the opening side of the one magnetic frame piece. When the magnetic frame is inserted and the slit is fitted into the convex portion provided on the other of the upper and lower plates of the bobbin, the magnetic frame is assembled and the magnetic frame and bobbin are fixed.

〔Example〕

FIGS. 1 and 2 show an embodiment of the present invention. As shown in FIG. It is composed of a pair of magnetic frame pieces 2 and 3, and these magnetic frame pieces 2 and 3 have horizontal end plate portions 4, 5, 6, and 7 that cover the upper and lower surfaces of the coil 20, which will be described later.
, a vertical side plate portion 8 that covers the side surface of the coil 20,
The end plate portions 4 to 7 are integrally connected to both the upper and lower ends of the plate member 9, and the end plate portions 4 to 7 are brought into contact with and overlap with each other.

In addition, in the above embodiment, the end plate portions 4 to 7
are within the range where the required size of the cross section of the magnetic path formed by them can be obtained,
The peripheral portion thereof is formed into an arc shape.

Holes 11 and 12 for inserting fixed cores 28 and 29, which will be described later, are bored in the overlapped portions of the end plate portions 4 to 7, and holes 11 and 12 are formed in the overlapping portions of the end plate portions 4 to 7. Slits 13, 14, 15, 16 are cut across the holes 11, 12 to eliminate eddy current loss.

FIG. 2 shows an example in which the present invention is applied to a proportional solenoid that can obtain an output proportional to the current value.
8, 29 are arranged, and the fixed cores 28, 29 are inserted into the holes 11, 12, and the coil 2
A movable core 30 that is attracted to the fixed cores 28 and 29 when energized is arranged in the axial direction.

On the other hand, the coil 20 is made by winding a winding 22 around a bobbin 21, and includes both upper and lower plates 2 of the bobbin 21.
3 and 24 have convex portions 25 and 2 that protrude in the vertical direction.
6 are provided at symmetrical positions with respect to the center of the bobbin, and the convex portions 25 and 26 are connected to the magnetic frame pieces 2 and 3.
By fitting the magnetic frame 1 and the coil 20 into the slits 14 and 15, the magnetic frame 1 and the coil 20 are fixed together.

The connection area between the holes 11 and 12 drilled in the end plate portion and the fixed cores 28 and 29 inserted therein is set to be equal to or larger than the cross-sectional area S of the core. , 12 is d, and the thickness of the magnetic frame pieces 2 and 3 is t, they are set so as to maintain the relationship S≦2πdt.

Also, when the width of the magnetic frame pieces 2 and 3 is w, S≦2wt A plate material that satisfies the following is used.

In the above embodiment, it is desirable that the end plates of the magnetic frame pieces 2 and 3 are connected to each other by spot welding to minimize the air gap between them.

Further, the solenoid of the present invention is not limited to the proportional solenoid shown in FIG. 2, but can also be applied to a normal solenoid.

[Effect of idea]

In the present invention, since the magnetic frame pieces are formed by bending a substantially rectangular plate, it is easier to remove the plate than the conventional T-shaped or H-shaped plate. Not only can this prevent waste, but also it can be easily bent.

In addition, the present invention has an extremely simple structure in which only convex portions are provided on both the upper and lower plates of the coil bobbin.
Since the magnetic frame and the coil can be fixed using the eddy current prevention slit provided in the magnetic frame, the two can be easily fixed without increasing costs.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the magnetic frame in the present invention, Figure 2 is a perspective view of the magnetic frame in the present invention;
The figure is a longitudinal sectional front view of an embodiment of the present invention. 1... Magnetic frame, 2, 3... Magnetic frame piece, 4, 5,
6, 7... End plate part, 8, 9... Side plate part, 1
1, 12... Hole, 13, 14, 15, 16... Slit, 20... Coil, 21... Bobbin, 2
5, 26... Convex portion, 28, 29... Fixed core, 3
0...Movable iron core.

Claims (1)

[Scope of utility model registration request] A magnetic frame is made by combining a pair of magnetic frame pieces of the same shape, each of which is formed by bending a plate material into a U-shape and integrally connecting end plate portions to both ends of a side plate portion, by overlapping the end plate portions; A coil provided within the magnetic frame, a fixed core attached to the magnetic frame and disposed within the coil, and a movable core that is attracted to the fixed core and slides in the axial direction when the coil is energized. In the solenoid, the plate material has a substantially rectangular shape, and a slit for preventing eddy currents is cut from a hole for inserting a fixed iron core provided at the overlapping part of the end plate part to the center of the tip of the end plate part. A solenoid characterized in that the magnetic frame and the coil are fixed by fitting projections provided on both upper and lower plates of the bobbin of the coil.