JPS5930289Y2 - Solenoid for solenoid valve - Google Patents

Description

[Detailed explanation of the idea] Field of use The present invention relates to a solenoid for an electromagnetic valve.

Prior art and its problems For example, as described in U.S. Pat. No. 3,262,027, a magnetic frame for a solenoid is formed into a U-shaped structure in which wing-shaped walls are connected at right angles to the upper and lower ends of the side walls. Those constructed from magnetic fragments are known.

However, since the button is formed by bending a sheet metal in such a magnetic frame, it is extremely difficult to maintain the perpendicularity between the side wall and the wing-like wall due to the suffling back phenomenon. If this is not possible, the button-sized inner surface of the wing-shaped wall cannot be opposed to the fixed core or the movable core with a sufficiently narrow gap, and the magnetic path cross-sectional area may be reduced due to the partial proximity of the two. The decrease in magnetic resistance or the increase in magnetic resistance due to the large gap between the two is significant, and as a result, there is a drawback that sufficient attraction force cannot be obtained between the two iron cores even if the same excitation coil is used.

This problem can be solved by using the first magnetic frame piece, which has a side plate part 7a and an end plate part 7b which cover one side surface and both upper and lower end surfaces of the excitation coil, as shown in FIGS. 1 and 2. 7, and a locking hook part 8 at the upper and lower ends of the side plate part 8a that covers the other side of the coil.
The problem is solved by constructing a magnetic frame 2 with a second magnetic frame piece 8 formed in series with c, and locking the locking hook part of the second magnetic piece to the end plate part of the first magnetic piece. However, in this case, a new problem arises: how to easily and reliably bring the local edges of the end plate of the first magnetic fragment and the upper and lower edges of the side plates of the first and second magnetic fragments into close contact with each other. occurs.

Technical Problem The technical problem of the present invention is to effectively and appropriately expand the magnetic path cross-sectional area between the end plate part and the side plate part of both magnetic fragments in a magnetic frame constituted by the first and second magnetic fragments. The objective is to reduce magnetic resistance.

Technical Means The technical means taken to solve the above problem is to insert magnetic fragments into the magnetic frame, the inner cylinder part facing the fixed iron core or the movable iron core, and the outer cylinder part inscribed in the side plate part of the magnetic frame piece. An auxiliary magnetic frame is provided that is integrally connected to the inside and outside of the flat plate portion that abuts the end plate portion of the magnetic head.

action The above technical means works as follows.

That is, when the end plate portion of the first magnetic fragment is engaged with the locking hook portion of the second magnetic fragment, the end plate portion and the upper and lower ends of the side plate portions of the first and second magnetic fragments are connected to each other. Even if there is a gap between them, the outer cylindrical portion and flat plate portion of the auxiliary magnetic frame and the side plate portions and end plate portions of both magnetic frame pieces will contact each other with a wide contact surface, and the two will be connected via the auxiliary magnetic frame. The contact area, that is, the cross-sectional area of the magnetic path is increased, thereby reducing the magnetic resistance between the two magnetic fragments.

In addition, if the above-mentioned auxiliary magnetic frame is not provided, the cross-sectional area of the magnetic path facing the fixed iron core or movable iron core with a button on the end plate is:
This corresponds to the inner area of the shaft hole in the end plate, and since the end plate is integrally formed with the side plate by sheet metal, the magnetic path cross-sectional area is relatively small compared to that of the side plate. However, by installing the auxiliary magnetic frame, the magnetic path cross-sectional area of the end face facing the iron core in the end plate increases, and at the same time, the magnetic path between the end plate and the iron core is increased by the inner cylindrical part of the auxiliary magnetic frame. The cross-sectional area increases, and a large electromagnetic force can be obtained due to the reduction in magnetic resistance.

effect According to the present invention, the following unique effects are produced.

That is, since the magnetic frame pieces and the auxiliary magnetic frame are brought into close contact with each other at their end plate portions and flat plate portions, and their side plate portions and outer cylinder portion, the machining accuracy of the first and second magnetic pieces is not good. Even in this case, the magnetic resistance does not particularly increase, and a solenoid for a solenoid valve having a large electromagnetic attraction force can be obtained.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings. In FIG. 1, reference numeral 1 denotes an excitation coil, the outside of which is surrounded by a magnetic frame 2, which will be described later.

A guide pipe 3 made of a non-magnetic material inserted into the axial center of the coil 1, a fixed iron core 4 inserted inside the guide pipe 3, and a fixed iron core that resists the biasing force of a spring 6 when the coil 1 is energized. The movable iron core 5 is arranged to be slidable in the axial direction within the guide pipe 3 to open and close the valve.

As is clear from FIGS. 2 and 3, the magnetic frame 2 is composed of first and second magnetic frame pieces 7 and 8 formed by plastic working of sheet metal, and the first magnetic frame piece 7 is , a side plate portion 7a covering approximately half of one side of the coil 1, and a pair of circular end plate portions 7b covering both upper and lower end surfaces of the coil 1,
7b are integrally connected, a shaft hole 7c through which the guide pipe 3 is inserted is bored in the center of the end plate part 7b, and a suline 1-7d for removing eddy current is cut in the radial direction. A pair of end plate portions 7b, 7b are bent to face each other, and side plate portion 7a is bent.
is curved into a semicircular shape to match the end plate portions 7b, 7b.

The second magnetic frame piece 8 has a window 8b for leading out the lead wire cut in the center of the side plate 8a that covers the remaining half of the side surface of the coil 1, and a window 8b for leading out the lead wires at both upper and lower ends of the side plate 8a. T-shaped locking hook parts 8c, 8c are arranged in series, and the side plate part 8a is connected to the side plate part 8a.
is curved in a semicircular shape as shown in Fig. 3.

When the first and second magnetic frame pieces 7 and 8 are joined as shown in FIG. magnetic frame piece 8
The locking hook portion 8c is locked.

As a result, the magnetic resistance between the end plate part 7b and the side plate part 7a s8a is reduced.

Further, as shown in FIG. 4, auxiliary magnetic frames 9, 9 made of a magnetic material, which are disposed opposite to each other at both the upper and lower ends of the excitation coil, have an inner cylindrical portion 9a that fits around the guide pipe 3, and a The outer cylinder part 9b inscribed in the side plate parts 7a and 8a of the first and second magnetic fragments are integrally arranged inside and outside of the flat plate part 9c that abuts the end plate part 7b of the first magnetic frame piece, A sulin) 9d for removing eddy currents is cut in a part, and it is constructed by drawing the sheet metal, and the end plate part 7b and the side plate part 7at8a are formed by drawing the sheet metal.
The magnetic resistance between the end plate portion 7b and the fixed iron core 4 or the movable iron core 5 is further reduced.

That is, the end plate part 7b and side plate parts 7a, 8a of the magnetic frame 2 are connected by the flat plate part 9c and the outer cylinder part 9b of the auxiliary magnetic frame 9.
The cross-sectional area of the magnetic path between the
The reduction in magnetic resistance due to this auxiliary magnetic frame 9 is due to the reduction in magnetic resistance caused by the end plate portion 7b.
This is effective when sufficient adhesion between the side plate portions 7a and 8a cannot be ensured.

At the same time, the inner cylindrical portion 9a of the auxiliary magnetic frame 9
is the fixed iron core 4 or the movable iron core 5 across the guide pipe 3.
The cross-sectional area of the magnetic path between the end plate portion 7b of the magnetic frame 2 and the fixed iron core 4 or the movable iron core 5 is also increased, and the magnetic resistance is reduced.

In this way, by reducing the magnetic resistance of the magnetic path surrounding the coil 1 by various means, a large attractive force can be obtained between the fixed iron core 4 and the movable iron core 5 when the coil 1 is energized.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a perspective view of the magnetic frame shown in Fig. 1, Fig. 3 is a perspective view of the separated state, and Fig. 4 is a perspective view of the auxiliary magnetic frame. . DESCRIPTION OF SYMBOLS 1... Excitation coil, 2... Magnetic frame, 4... Fixed iron core, 5... Movable iron core, 7, 8... Magnetic frame piece, 7a
, 8a... Side plate part, 7b... End plate part, 8c... Locking hook part, 9... Auxiliary magnetic frame, 9a... Inner cylinder part, 9b
... Outer cylinder part, 9c... Flat plate part.

Claims (1)

[Scope of utility model registration request] A magnetic frame surrounding the excitation coil in a solenoid, in which a fixed iron core is inserted into the axial center of the excitation coil and a movable iron core is arranged so as to be slidable in the axial direction, covers approximately half of one side of the coil. A first magnetic fragment is formed by integrally forming a side plate part and an end plate part covering both upper and lower end surfaces by plastic processing of a sheet metal, and a side plate part covering the remaining half of the other side surface of the coil and its upper and lower ends are engaged. A second magnetic fragment is integrally formed with a locking hook portion by plastic working of a sheet metal, and the locking hook portion of the second magnetic fragment is engaged with an end plate portion of the first magnetic fragment. In the magnetic frame, an inner cylindrical part facing the fixed core or the movable core and an outer cylindrical part inscribed in the side plate part of the magnetic fragment, and a flat plate part that abuts against the end plate part of the magnetic fragment. A solenoid for a solenoid valve, characterized by having an auxiliary magnetic frame integrally arranged inside and outside the solenoid.