JPH06101406B2 - Method for manufacturing coil assembly in electromagnet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to solve the following problems.

(Field of Industrial Application) The present invention relates to a method for manufacturing a coil assembly in an electromagnet.

(Prior Art) In a conventional method of manufacturing a coil assembly in an electromagnet, a case having a through hole for inserting a tube assembly is used, a coil or the like is left in the case, and then a casting resin is injected. As a preparatory step, the casting jig must be screwed and fixed in a state where it penetrates through the through hole of the above case as a preparatory step, and then be marked with silicone grease or the like to prevent resin leakage. Not
The preparatory work involved a very troublesome problem.

(Problems to be Solved by the Invention) The present invention is intended to provide a method for manufacturing a coil assembly in an electromagnet, which is capable of performing work with less labor, except for the above-mentioned conventional problems.

The configuration of the present invention is as follows.

(Means for Solving Problems) The invention of the present application employs means as described in the claims, and its operation is as follows.

(Operation) A casting jig and a coil are placed in a case where a portion of the tube assembly to be inserted is closed by a temporary lid. After that, the casting resin is poured into the case. A method for manufacturing a coil assembly in an electromagnet, characterized in that the jig and the temporary lid are removed after the resin is cured.

(Example) Hereinafter, drawings showing an example of the present application will be described. In FIG. 1 showing the cross-sectional structure of the electromagnet, the electromagnet 1 comprises a coil assembly 2, a tube assembly 3 and a fastener 4 for integrally fixing the two. The coil assembly 2 has an insertion space 2a for inserting the tube assembly 3 as shown in FIG. In this coil assembly 2, 5 is a case body,
With a metal material such as aluminum or a synthetic resin such as nylon, the plane shape is formed into a square shape in addition to the round shape as shown in FIG. The case body 5 may be made of a hard or soft material as long as it has a rigidity enough to keep its shape. Reference numeral 6 denotes a cylindrical portion of the case body 5, and reference numeral 7 denotes a concave-convex portion for engagement, and a large number of them are arranged side by side in an annular shape as clearly shown in FIG. Reference numeral 8 denotes a coil device provided in the case body 5. In this, 9
Is a bobbin, 10 is a coil winding, and 11 is an electric element connected to the coil winding 10. For example, a surge absorbing element or a rectifying element is used. 12 is a lead wire connected to the coil winding 10,
Reference numerals 13 denote electric connection pins connected to the lead wire 12, respectively. 1
Reference numerals 4, 15 and 16 are well-known yokes that form an external magnetic circuit, and are formed by stacking multiple sheets of high-permeability material such as an iron plate or a silicon steel plate whose surface is insulated to form a single plate. Has been. Reference numeral 17 denotes a lid, which is made of a material such as resin or aluminum and has a casting hole 18. 19 is the case body 5
The casting resin filled between the coil device 8 and the yokes 14, 15, 16 is shown. As this resin, a resin having a good insulating property and having a hardness that prevents relative movement of the coil device 8 and the yokes 14, 15, 16 is used. As an example, an epoxy liquid resin is used, but any other resin material such as polyester resin may be used.

Next, in the tube assembly 3, 21 is a fixed iron core, which is made of a magnetic material such as a corrosion-resistant soft magnetic material, electromagnetic stainless steel, and silicon iron, and has a connecting portion 22 for the valve device. A hollow cylinder 23 is made of an extremely low magnetic permeability material such as non-magnetic stainless steel and has one end welded to the fixed iron core 21. Reference numeral 24 denotes a closed body, which is welded to the other end of the hollow cylinder 23. 25 is a closed body
A male screw portion for screwing formed on the outer peripheral surface of 24, 26 is a well-known push pin provided on the axial center of the closing body so as to be able to move forward and backward, and 27 is an O-ring for maintaining airtightness. Reference numeral 28 denotes a movable iron core provided in the hollow cylinder 23, which can be moved up and down in the vertical direction in FIG. Reference numeral 29 is a rod for transmitting the movement of the movable iron core 28 to the valve device, and is made of a material such as high manganese steel or nitrogen-containing stainless steel that is not magnetized even when work hardened.

Next, in the fastener 4, 31 is an internal thread portion and 32 is an engaging portion, which can be engaged with the uneven portion 7.

Next, a manufacturing procedure of the electromagnet 1 having the above configuration will be described.
The coil assembly 2 and the tube assembly 3 are manufactured in separate processes. The coil assembly 2 is manufactured as follows. First, the case 34 as shown in FIG. 2 is formed by a known molding means. This case 34
In the figure, reference numeral 35 denotes a temporary lid that closes a portion of the case body 5 where the tube assembly is to be inserted (inside the tubular portion 6). Reference numeral 36 indicates a connecting portion between the main body 5 and the temporary lid 35. In FIG. 7 showing the structure in detail, 37 is an annular groove, which has a section V
It is formed in a letter shape. In addition, in FIG. 7, an example of the dimensions of the portions indicated by reference characters A to D is 1.5 mm for A and 1 to 1.5 m for B.
m and C are 0.5 to 0.8 mm, and D is about 0.2 mm. The annular groove 37 may be provided on the inner surface side (lower surface in FIG. 7) of the temporary lid 35. Next, a yoke is provided in the case 34 shown in FIG.
The post casting jig 38, in which 14, 15, the coil device 8, the yoke 16 and the lid 17 are mounted in this order, is inserted and the tip thereof is positioned inside the cylindrical portion 6 of the case body 5. The outer diameter of the jig 38 is preferably the same as the outer diameter of the tube assembly 3 or larger by about 0.1 mm. In this state, the jig 38 is used by the jig 38, the cylindrical holes of the yokes 14 and 16 and the coil bobbin 9,
Furthermore, the hole 17 for inserting the tube assembly in the lid 17
a is all coaxial. Next, as shown in FIG. 5, the casting resin 19 is poured from the casting nozzle 39 through the casting hole 18 into the case 34 until it reaches the lid 17. This injection work is generally performed in a vacuum state in a vacuum container in order to improve the permeability of the resin into the details, but may be performed in the atmosphere. After the injection of the resin 19 is completed as described above, the resin 19 is cured by leaving or heating at room temperature.

When the resin 19 is completely hardened or almost hardened, next, as shown in FIG. 6, the coil assembly 2 with the temporary lid 35 and the jig 38 attached is placed on the jig 40, and the punching tool is used. 41
Is pushed or driven downward from above the temporary lid 35. This work may be performed by a press machine or manually using a hammer or the like. By pushing or punching the punching tool 41 as described above, the temporary lid 35 is broken from the case body 5 along a fracture surface starting from the groove bottom 37a as shown by reference numeral 42 in FIG. It is pushed down. As a result, the coil assembly 2 having the insertion space 2a is completed as shown in FIG.

Next, the tube assembly 3 is inserted into the insertion space 2a of the coil assembly 2 completed as described above from the bottom to the top in FIG. 8, and the female screw portion 31 of the fastener 4 is inserted into the male screw portion 25 of the tube assembly 3. Then, the fastener 4 is tightened so that the engaging portion 32 is in pressure contact with the engaging concave-convex portion 7. As a result, the electromagnet 1 as shown in FIG. 1 is completed.

(Effect of the invention) As described above, in the present invention, when the resin 19 is injected because the bottomed case 34 is used, the resin
No worries about leaking 19. Therefore, the work of the pre-setting work as in the prior art is unnecessary, and the workability is greatly improved.

[Brief description of drawings]

The drawings show the embodiments of the present application. FIG. 1 is a vertical cross-sectional view of an electromagnet, FIG. 2 is a vertical cross-sectional view of a case, FIG. 3 is a view on arrow III in FIG. 2, and FIGS. The drawing is a vertical cross-sectional view for explaining the manufacturing process of the coil assembly, FIG. 7 is an enlarged view of the portion VII in FIG. 6, and FIG. 8 is a vertical cross-sectional view of the completed coil assembly. 5 …… Case body, 34 …… Case, 35 …… Temporary lid, 38 ……
Jig, 19 ... Casting resin, 8 ... Coil device.

Claims (1)

[Claims] 1. A casting jig and a coil are allowed to remain in a case in which a portion to be inserted into a tube assembly is closed by a temporary lid, and then a casting resin is injected into the case to A method for manufacturing a coil assembly in an electromagnet, wherein the jig and the temporary lid are removed after curing.