JPH02302012A - Electromagnetic iron core device - Google Patents

Abstract

PURPOSE:To accurately suppress a vibration of iron cores and to surely reduce noise by a method wherein an adhesive is laid at an end face of the central leg of a first E-shaped iron core and at end faces of individual side legs and at a part facing a second iron core and faced parts are bonded. CONSTITUTION:A first iron core and a second iron core 2, 3 are formed respectively to be E-shaped. End parts of central legs 8, 8 and end faces of individual side legs 9, 9 of these iron cores 2, 3 are confronted so as to be faced mutually; an adhesive 15 by, e.g. a one-liquid epoxy resin is laid between individual faced parts; the end faces of the central legs 8, 8 and the end faces of the individual side legs 9, 9 are bonded to each other by using the adhesive 15. That is to say, the end faces of the central legs 8, 8 of the iron cores 2, 3 are bonded, and the end faces of the individual side legs 9, 9 are bonded by using the adhesive 15. The iron cores 2, 3 are bonded to each other firmly. Consequently, it is possible to accurately suppress a vibration of the iron cores 2, 3 and to surely reduce noise.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an electromagnetic core device used in a ballast or the like incorporated in a lighting device.

(Prior art) The configuration of a ballast built into a lighting fixture is shown in Figures 4 and 5.
As shown in the figure, reference numeral 1 denotes an electromagnetic core device. This electromagnetic core device 1 is made up of a pair of first and second cores 2.3 butted against each other, and a coil 4 is installed between these cores 2.3. A terminal block 5 is provided on one end surface of the coil 4, and an end of the winding of the coil 4 is drawn out onto the terminal block 5.

As shown in FIG. 6, the pair of cores 2 and 3 constituting the electromagnetic core device 1 are each formed into an E-shape integrally having a central leg 8 and side legs 9 and 9 disposed on both sides thereof. The end surfaces of the center legs 8, 8 and the end surfaces of the side legs 9, 9 are abutted so as to face each other.

The electromagnetic core device 1 is housed in a metal case 10, and the case 10 has a cross section with an open top surface shaped like a U-shape. Each has a caulking piece 13 integrally therein. Then, a top cover 16 is placed on the top surface of the electromagnetic core device 1.
This upper cover 16 is secured to the case 1 by the caulking pieces 13...
The electromagnetic core device 1 is fixed to the case 10 by this crimping force.

In such a state, the coil 4 is energized, but this energization causes the core 2.3 to vibrate and generate a so-called whining noise. The gap G between the end faces is filled with an adhesive 15, and the center legs 8.8 are bonded together using the adhesive 15 to suppress vibration.

(Problem to be Solved by the Invention) However, if only the center legs 8.8 are bonded together, the effect of suppressing vibrations on the core 2.3 is weak and large noise is generated. The crimping force of .3 is increased to suppress the perturbation. However, in order to increase the crimping force on the iron core 2.3, it is necessary to increase the thickness of the case 10 including the crimping pieces 13, which not only increases the material cost but also increases the crimping force. The tightening work is also troublesome, and furthermore, there is a problem that the degree of noise reduction varies depending on the quality of the tightening.

The present invention has been made with attention to these points, and an object of the present invention is to provide an electromagnetic core device that can reliably and stably reduce noise by simple means without particularly increasing the crimping force on the core. The purpose is to

[Structure of the Invention] (Means for Solving the Problems) In order to achieve such an object, the present invention includes an E-shaped first iron core having a central leg and a pair of side legs, and a first iron core of the E-type. A second iron core abuts against the first iron core and faces the end face of the central leg and the end faces of each side leg, and the central leg and each side leg of the E-shaped first iron core and the second An adhesive is interposed between the opposing parts of the iron core to bond the opposing parts.

(Function) The central leg of the E-type first core! Since the facing portions of the #A side and the end faces of each side leg and the second core are bonded with adhesive, the first and second cores are firmly connected to each other and vibrations occur when the coil is energized. is definitely suppressed.

(Example) Examples of the present invention will be described below.

A first embodiment is shown in FIG. 1, in which the first and second cores 2.3 are each formed in an E-shape.

The end faces of the central leg 8.8 of these iron cores 2.3 and the end faces of the side legs 9, 9 are abutted so as to face each other, and between the opposing faces, for example, liquid epoxy resin is applied. The end faces of the central leg 8.8 and the end faces of the side legs 9.9 are bonded to each other with the adhesive 15.

The electromagnetic core device of the present invention configured as described above and the conventional electromagnetic core device shown in FIG. 6 in which only the end faces of the central legs 8.8 are bonded with adhesive 15 were stabilized under the same conditions. The table below shows the results of measuring the noise after assembling the device into a container. As shown in Figure 2, the method for measuring noise is to place a single stable $a connected to the lighting circuit of a fluorescent lamp on a maltbrain stand, and wait for 1 hour after turning on the fluorescent lamp. 1 above from the top surface of ballast a at the time when
Noise at a position of 0 cm was measured with sensor C.

As is clear from this table, in the present invention, in addition to bonding the end surfaces of the central leg 8.8 of the iron core 2.3, the end surfaces of the side legs 9, 9 are also bonded together with the adhesive 15. Since the iron cores 2 and 3 are strongly connected to each other, vibrations of the iron cores 2 and 3 are suppressed more accurately than in the past, and noise is reliably reduced.

FIG. 3 shows a second embodiment, in which the first iron core 2 is formed in an E-shape and the second iron core 3 is formed in an I-shape. Then, the side surfaces of the I-shaped core 3 are abutted so as to be opposed to the end surfaces of the central leg 8 and the end surfaces of each side leg 9 of the E-shaped core 2, and in this state, an adhesive 15 is interposed between each of the opposing sides. The I-type second core 3 is bonded to the E-type first core 2 with these adhesives 15.

Even in this configuration, since the side surfaces of the I-type core 3 are bonded to the end face of the center leg 8 and the end face of each side leg 9 of the E-type core 2, the entire core 2.3 vibration is effectively suppressed and noise is reliably reduced.

[Effects of the Invention] As explained above, according to the present invention, an adhesive is interposed between the end face of the central leg and the end face of each side leg of the E-type first core and the second core, respectively. Since the opposing portions are bonded together, it is possible to accurately suppress the lift of the iron core and reliably reduce noise.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an electromagnetic core device according to a first embodiment of the present invention, FIG. 2 is an explanatory diagram showing a method for measuring noise, and FIG. 3 is a plan view of an electromagnetic core device according to a second embodiment of the present invention. 4 is a perspective view of the ballast, FIG. 5 is a sectional view, and FIG. 6 is a plan view of a conventional electromagnetic core device. 1... Electromagnetic core device, 2... First core, 3...
Second iron core, 8... Central leg, 9... Side leg, 15...
·glue.

Claims (1)

[Claims] an E-shaped first core having a central leg and a pair of side legs;
a second iron core abutting against the E-shaped first iron core and facing an end surface of the central leg and an end surface of each side leg; An electromagnetic core device characterized in that the facing portions of the second core are bonded by interposing an adhesive between the facing portions of the second core.