JPH0229687Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvements in solenoids used in electromagnetic valves and the like.

Generally, the bobbin for winding the coil in a solenoid is required to be as thin as possible in order to miniaturize the coil and make effective use of electromagnetic force. There is a problem of deformation due to the tightening force of the winding, and it is necessary to prevent this deformation by some means.

The present invention effectively utilizes a magnetic flange-like member for reducing magnetic resistance to reinforce the bobbin. By integrally embedding the core and the armature, the bobbin is made to maintain sufficient strength and the suction force between the core and the armature is increased.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. A valve seat 4 provided therein is configured to be opened and closed by a valve body 6 driven by a solenoid 5.

The solenoid 5 includes an excitation coil 8 wound around a bobbin 7, and a magnetic frame 9 that molds the coil 8 into an electrically insulating resin layer 11 as needed to form a magnetic path around its outer periphery. 10, and a non-magnetic guide tube 12 is inserted into the shaft hole at the center of the bobbin 7. A core 13 is provided at the upper end of the guide tube 12.
is fitted and fixed by rolling caulking or the like, and an armature 15 that is attracted to the core 13 against the urging force of the spring 14 when the coil 8 is energized is slidable in the axial direction within the guide tube 12. A valve element 6 for opening and closing the valve seat 4 is provided at the lower end of the armature 15.

As shown in FIGS. 1 and 2, the bobbin 7 includes a reel-shaped member 16 made of an electrical insulator around which the coil 8 is wound, and a pair of reinforcing and magnetic resistance reducing members integrally embedded in both ends of the reel-shaped member 16. It is composed of magnetic flange-like members 17, 17. The reel-like member 16 of the electric insulator includes flange parts 16b, 16b at both ends of a pipe part 16a for winding, and magnetic flange-like members 17, 17 are connected to the inner surface of both ends of the pipe part 16a and the flange parts 16b, 1.
It is buried so as to be exposed to the outside at the outer end surface of 6b. These flange-like members 17
As shown in FIG. 3, it has a cylindrical portion 17a and a flange portion 17b, and a slit 17c for removing eddy currents is cut across both.

When the bobbin 7 is assembled into the solenoid 5, the flange portions 1 of the magnetic flange-like members 17, 17, as shown in FIG.
7b, 17b are in contact with the magnetic frames 9, 10, and the cylindrical parts 17a, 17a in the magnetic flange-like members 17, 17 are in contact with the core 13 across the guide tube 12.
and the armature 15, thereby increasing the cross-sectional area of the magnetic path from the magnetic frames 9, 10 to the core 13 and the armature 15, and reducing magnetic resistance in the magnetic path.

In FIG. 1, reference numerals 18 and 19 indicate a retaining ring and washer fitted to the guide tube 12;
0 is O arranged between the valve body 1 and the solenoid 5
It's a ring.

In the solenoid valve having the above configuration, when the coil 8 shown in FIG. 1 is not energized, the armature 15
is biased by a spring 14, and the valve body 6 at its tip closes the valve seat 4. However, when the coil 8 is energized, the armature 15 resists the biasing force of the spring 14 and is attracted to the core 13. The valve body 6 moves upward and the valve seat 4 is opened.

In the above-mentioned solenoid 5, the bobbin 7 on which the coil 8 is wound is constituted by a reel-like member 16 of electrical insulator and flange-like members 17, 17 embedded in both ends of the reel-like member 16.
Since the bobbin 7 is reinforced by the wires 7 and 17, it is possible to prevent the bobbin from deforming due to the load applied during winding, and the reel-shaped member 16 can be formed thin due to the above-mentioned reinforcement. coil 8
The magnetic flux density can be increased by shortening the distance between the magnetic flange-like members 17, 17, and the like. Furthermore, since the cross-sectional area of the magnetic path is increased by the flange-like members 17, 17, the magnetic resistance is of course reduced, but these effects also increase the magnetic flux in the magnetic path. , a large suction force can be obtained between the core 13 and the armature 15.

As described above, according to the solenoid of the present invention, the bobbin around which the excitation coil is wound is constructed by integrally embedding the magnetic flange-like member in the reel-like member of the electrical insulator. It is possible to maintain sufficient strength against the load applied during winding, which makes handling and assembly extremely easy.Moreover, the magnetic flange-like member reduces the cross-sectional area of the magnetic path. Since the magnetic flux is increased, a large attractive force can be obtained between the core and the armature due to the increase in magnetic flux.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electromagnetic valve using the solenoid of the present invention, FIG. 2 is a sectional view of its bobbin, and FIG. 3 is a perspective view of a flange-like member of the bobbin. 7... Bobbin, 8... Coil, 9, 10... Magnetic frame, 12... Guide tube, 13... Core, 15...
Armature, 16... Reel-shaped member, 16a...
...Pipe part, 16b...Flange part, 17...
...Magnetic flange-like member.

Claims (1)

[Scope of utility model registration request] A magnetic frame that forms a magnetic path is arranged outside the excitation coil wound around the bobbin, and the core is fitted and fixed inside the non-magnetic guide tube inserted into the shaft hole at the center of the bobbin. The bobbin is fitted with an armature that is attracted to the core when energized, and the bobbin is reinforced with a cylindrical portion and a flange portion on the flange portions at both ends of the winding pipe portion of the reel-shaped member of the electrical insulator. It is constructed by integrally embedding a magnetic flange-like member for reducing magnetic resistance, and the cylindrical portions of both flange-like members face the core and armature, respectively, across the guide tube, and the flange-like members A solenoid characterized in that each of the flange portions of the solenoid is in contact with a magnetic frame.