JPH0125827Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Field of Industrial Application The present invention relates to an attractor that is used in a solenoid valve and is provided with a kumatori coil for eliminating residual magnetism.

(2) Prior Art As shown in Figure 1, a solenoid valve has a structure in which an attractor 2 is inserted into one end of a plunger tube 1, an electromagnetic coil 3 is fitted on the outside of the attractor 2, and an electromagnetic coil 3 is inserted into the other end. A valve seat 6 having a valve hole 7 is inserted into the valve hole 7, and an inlet pipe 4 and an outlet pipe 5 are connected in front and behind the valve hole 7. The plunger 8 inserted between the attractor 2 and the valve seat 6 is configured such that one end on the attractor 2 side is supported by a spring 9 and can be moved back and forth by the magnetic force generated in the electromagnetic coil 3 and the elasticity of the spring 9. Then, the ball valve 11 is positioned in the ball valve hole 10 provided in the end face on the valve seat 6 side. That is, the ball valve 11 opens and closes the valve hole 7 provided in the valve seat 6 by the movement of the plunger 8, thereby opening or closing the inlet pipe 4 and the outlet pipe 5.

As shown in Figures 2, 3, and 8, the iron attractor used in such a solenoid valve has a screw hole 13 for fixing on one end, and a circular square groove on the other end. 12 is bored, and a Kumatori coil for erasing residual magnetism when the electromagnetic coil 3 is de-energized is embedded in this circular square groove 12.

In order to construct the Kumatori coil, the conventional suction element is made by punching out a copper plate into a circular shape as shown in Fig. 4.
As shown in FIG. 5, a square copper ring 14a formed with a square cross section is press-fitted into the circular square groove 12, and after fitting, the edges of the circular square groove 12 are caulked at several places to prevent the square copper ring 14a from falling off. Ta.

(3) Problems to be solved by the invention In the conventional attractor, a square copper ring 14a with a square cross section that has been punched out to form the Kumatori coil is press-fitted into the circular square groove 12, and the square copper ring 14a is pressed into the circular square groove 12.
Since the edges of 2 were caulked, not only did it require a lot of manufacturing man-hours, but also the circular square groove 12 and the square copper ring 1
Processing 4a required a high degree of dimensional accuracy and had the drawback of being wasteful in material removal. Therefore,
The problem was that it led to high production costs.

(4) Means for solving the problem The present invention solves the problems of the conventional suction device with a Kumatori coil. In an iron attractor for a solenoid valve, a circular square groove into which a Kumatori coil for residual magnetism elimination is inserted is bored on one end face of the attractor, and a ring-shaped copper wire with a circular cross section inserted into the circular square groove is heated in a non-oxidizing furnace. This is an attractor for a solenoid valve that is made up of a Kumatori coil that is heated and welded inside.

(5) Action When current flows through the electromagnetic coil, the plunger is attracted and moves toward the attractor, and the ball valve at the other end of the plunger is released from the valve opening on the valve seat and opens, connecting the inlet pipe and outlet pipe. let When the electromagnetic coil is de-energized, the plunger is restored by the elasticity of the spring, and the ball valve closes the valve hole again. However, when the power is turned off, the residual magnetism of the electromagnetic coil acts against the elasticity of the spring, resulting in a delay in the plunger's recovery and a reduction in its immediate action.

In this invention, the copper wire inserted into the circular square groove drilled in the end face of the plunger side of the suction element is heated and welded to form the Kumatori coil, so the Kumatori coil does not fall off from the suction element and becomes integrated with the suction element. This effectively eliminates this residual magnetism and improves the resilience of the plunger.

(6) Examples Next, the present invention will be explained using examples. The present invention involves winding a copper wire with a circular cross section as shown in FIG. 14b is inserted into the circular square groove 12 provided on the end face of the plunger 8 side of the suction element 2, and then heated in a non-oxidizing furnace and welded into the circular square groove 12 as shown in FIG. 8, thereby forming the Kumatori coil 14. do. Therefore, the welded Kumatori coil 14 is placed inside the circular square groove 12.
It is in a state where it is integrated with the suction element 2 and fitted, and it does not come off from the circular square groove 12 at all and exhibits the effect as a Kumatori coil.

(7) Effects of the invention The quality of the suction element according to the invention is improved because it is an suction element in which a ring-shaped copper wire with a circular cross section is inserted into a circular square groove and heat welded to form a kumatori coil for eliminating residual magnetism. Not only that, there is no wastage of copper material, the punching work of copper plates, press-fitting work, and crimping work to prevent them from falling off can be omitted, and the dimensional accuracy of circular square grooves and ring-shaped copper wires has also been greatly improved. Therefore, the production cost can be significantly reduced even after the heat welding process. In addition, the Kumatori coil is completely integrated with the attractor by welding the ring-shaped copper wire, so it does not fall off, which improves the residual magnetism erasing effect, and has the advantage of making it easy to fully automate mass production. .

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing the structure of a solenoid valve, Figure 2 is a vertical cross-sectional view of an attractor for a solenoid valve before installing a Kumatori coil, Figure 3 is a bottom view of Figure 2, and Figure 4 is a conventional Fig. 5 is a plan view of the square copper ring used in the Kumatori coil, Fig. 5 is a cross-sectional diagram of the square copper ring, Fig. 6 is a plan view of the ring-shaped copper wire used in the Kumatori coil of the attractor according to the present invention, and Fig. 7 is the ring-shaped copper wire. A cross-sectional view of the copper wire, and FIG. 8 is a vertical cross-sectional view of the attractor according to the present invention.

Claims (1)

[Scope of utility model registration request] In an iron attractor for a solenoid valve that is fitted to one end of a plunger tube 1 that has an electromagnetic coil 3 fitted to the outside, a circular square groove 12 is provided on one end surface of the attractor 2 into which a residual magnetism elimination coil 14 is fitted. The magnet coil 14 is constructed by heat-welding a ring-shaped copper wire 14b having a circular cross section, which is drilled and inserted into the circular square groove 12, in a non-oxidizing furnace.