JPS5932087Y2 - solenoid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solenoid used in a solenoid valve or the like that changes the flow direction of fluid mainly by electromagnetic operating force.

A conventional electromagnetic valve equipped with a solenoid generally has a configuration as shown in FIG. When the coil 1 is energized, the fixed iron core 6,
An annular magnetic path 8 passing through the magnetic frame 7 and the movable core 3 is formed, and the movable core is attracted to the fixed core 6 against the biasing force of the spring 2, thereby opening the valve seat 5. be.

As shown in FIGS. 1 and 2, the magnetic frame 7 has a U-shaped magnetic frame piece 7a surrounding the top and side surfaces of the coil 1, and a plate 8 surrounding the bottom surface of the coil 1. The coil 1 is sandwiched and overlapped on the magnetic frame piece 7b, so that a gap naturally exists between the two pieces 7a and 7b, and this gap is the magnetic flux in the magnetic path 8. This created a large resistance, reducing the suction force between the two iron cores 3 and 6.

Furthermore, as shown in FIG. 3, there is also a magnetic frame 7 configured by a pair of U-shaped magnetic frame pieces 7c, 7c.
For example, in Japanese Utility Model Application Publication No. 54-64952), the two magnetic frame pieces 7c, 7c had to be connected by adhesive, welding, or other special means, and the connection required a considerable amount of effort.

The present invention has been made in view of the above, and when a pair of magnetic frame pieces are connected to form a magnetic frame, the resistance to magnetic flux of the magnetic frame itself is reduced, and the connection of the magnetic frame pieces is This method is characterized in that it can be carried out reliably by simple means.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.The solenoid 11 shown in FIG.
Insert the guide pipe 14 inside the coil 13 surrounded by
A fixed iron core 15 is fitted inside and above the guide pipe 14, and a movable iron core 16 is arranged below it so as to be slidable in the axial direction, and is used for driving a solenoid valve or the like.

The magnetic frame 12 consists of a pair of magnetic frame pieces 17 and 17 of the same shape, which are formed by bending a metal plate into a U-shape, and each magnetic frame piece 17 is a top plate that covers the top and bottom surfaces of the coil 13. The portion 18 and the bottom plate portion 19 are integrally connected to both the upper and lower ends of the side plate portion 20 that covers one side of the coil 13, and the top plate portion 18.18 and the bottom plate portion 19.19, respectively. As shown in FIG. 5, a half-split dovetail-shaped protrusion 21.21 and a half-split dovetail-shaped recess 22, 22 are formed at the end of the tip side, respectively.

A pair of magnetic frame pieces 17.17 thus formed
With the convex portion 21.21 and the four portions 22.22 engaged with each other, the tip sides of the top plate portion 18.18 and the tip sides of the bottom plate portion 19.19 are brought into contact with each other, and the tips of each A sixth hole is formed in the through holes 23 and 24 formed in the center between the sides.
A bushing 25 made of an elastic material, which is composed of a cylindrical part 26 and a flange part 27 having a slit 28 as shown in the figure, is press-fitted, and the convex part 21. 21 and the recesses 22, 22 are held in a locked state, thereby both magnetic frame pieces 17.17
It unifies them.

Note that by removing the bushing 25, the pair of magnetic frame pieces 17, 17 can be easily separated.

The bushing 25 can be made of a magnetic material or a non-magnetic material. When a magnetic material is used, the cylindrical portion 26 is made long so that the area facing the fixed iron core 15 and the movable iron core 16, that is, the magnetic path It is also possible to expand the cross-sectional area.

As mentioned above, the magnetic frame 12 is connected to the top plate part 18 and the side plate part 20.
and a magnetic frame piece 17.1 in which the bottom plate portion 19 is integrally connected.
7, there is no gap between the side plate portion 20 and the bottom plate portion 19 in each magnetic frame piece 17, and the resistance to magnetic flux is significantly reduced compared to the conventional structure in which a gap exists there.

On the other hand, gaps exist substantially in the abutting portions 29.30 between the top plate portions 18.18 and the bottom plate portions 19.19 of the magnetic frame pieces 17.17 constituting the magnetic frame 12, but each magnetic frame piece 17.17 constitutes an annular magnetic path 31 together with the fixed iron core 15 and the movable iron core 16, so the above-mentioned gap forms the magnetic path 3.
does not affect the reluctance in coil 1, but rather
Due to the reversal of the direction of the excitation current flowing in the magnetic frame 12
This effectively acts to suppress eddy currents generated in the top plate 12a and bottom plate 12b.

According to the solenoid of the present invention constructed in this way, the top plate portion and the bottom plate portion of the pair of magnetic frame pieces are formed at the ends of their tip sides, and have a half-split dovetail-shaped protrusion and a dovetail-shaped recess. A cylindrical bushing made of an elastic material is press-fitted into a through hole provided in the center of the tip side, so that the elastic force in the direction of diameter expansion of the bushing causes The convex portion and the concave portion are held in a locked state, thereby making it possible to connect the pair of magnetic frame pieces together.

In addition, since the structure of the magnetic frame piece and the bushing is very simple, it is not only easy to manufacture them, but also the work for connection, that is, the engagement of the convex part and the concave part, and the press-fitting of the bushing into the through hole. However, since the top plate, bottom plate, and side plate of the magnetic frame piece are integrally formed, there is no gap in the magnetic frame piece that would cause magnetic resistance, and therefore the attraction force is reduced. Since there is no decrease in , a high-capacity, high-efficiency solenoid can be obtained.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional electromagnetic valve equipped with a solenoid, Fig. 2 is a perspective view of its main parts, Fig. 3 is a perspective view of main parts of another conventional example, and Figs. 4 and 5 are the invention of the present invention. FIG. 6 is a sectional view and a plan view of one embodiment, and FIG. 6 is a perspective view of a bushing used therein. 12... Magnetic frame, 13... Coil, 1
5... Fixed iron core, 16... Movable iron core,
17... Magnetic frame piece, 18... Top plate part, 19... Bottom plate part, 21... Convex part,
22... Concavity, 23° 24... Through hole,
25...Butshu.

Claims (1)

[Scope of utility model registration request] A fixed iron core is disposed inside a coil whose outside is surrounded by a magnetic frame, and a movable iron core which is attracted to the fixed iron core when the coil is energized is arranged so as to be able to slide in the axial direction. Consisting of a pair of magnetic frame pieces of the same shape, each magnetic frame piece has a half-split shape with a top plate part and a bottom plate part that cover the top and bottom surfaces of the coil formed at the ends of their tip sides. The dovetail-shaped convex part and the dovetail-shaped concave part are butted together in a mutually engaged state, and a cylindrical bushing made of an elastic material is press-fitted into a through hole provided in the center of the tip side to connect them. Features a solenoid.