JP2000182847A - Fixing structure for transformer core and transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing structure capable of fixing a large-size transformer with a screw, without lowering the characteristics of the transformer, even if by chance the screw loosens. SOLUTION: In a fixing structure, an elastic flat spring 1 is used. The flat spring 1 includes a ceiling part bent inward, and both arm parts elongated into an L-shape from both sides of the ceiling part in such a way that transformer cores 3a and 3b are thereby held. In addition, two or more holes 16 for fixing transformer cores 3a and 3b to a base plate and the like are formed. A bent part 11 of the ceiling part pushes the central part of the transformer cores 3a and 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer core fixing structure and a transformer capable of always fixing a transformer core with a constant pressure and enabling mounting by screwing.

[0002]

2. Description of the Related Art In a conventional transformer core fixing structure, a leaf spring for fixing a transformer core is described as in Japanese Patent Application Laid-Open No. 7-106157, but the mounting is performed by fixing a coil bobbin to a substrate. Since the transformer core is as large as possible, it does not have a shape that can be screwed.

For this reason, a high-power type power supply requires a large transformer, and cannot be fixed by soldering on a board. Therefore, a leaf spring was screwed together with the transformer core to a heat dissipation base plate or the like.

FIG. 3 is an explanatory view of a conventional example. In FIG. 3, the transformer core fixing structure includes a bent portion 11 for pressing the center of the transformer core 3a, positioning portions 24 and 25 for positioning the transformer cores 3a and 3b, and a screw hole 16 for fixing.
, A transformer winding unit 2 having primary and secondary terminals, upper and lower transformer cores 3a, 3b, and a leaf spring 1 are screwed into screw holes 21a, 21b of a heat dissipation base plate or the like. Screws 4a and 4b are provided.

[0005] The transformer core is fixed by the transformer winding 2
Is inserted into the leaf spring 1 in combination with the transformer cores 3a and 3b, and the leaf spring 1 is screwed into the screw holes 21a and 21b of the heat dissipation base plate or the like with screws 4a and 4b.
4b and the spring pressure of the leaf spring 1, the transformer core 3a,
3b was fixed.

[0006]

In the prior art described above, the gap between the transformer core 3a and the transformer core 3b is shifted depending on how the screws 4a and 4b are tightened, resulting in variations in characteristics, vibration, and the like. The loosening of the screws 4a and 4b causes an increase in the gap, causing a problem such as deterioration of the characteristics.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transformer core fixing structure and a transformer having a structure capable of screwing a large-sized transformer and preventing the characteristics of the transformer from being degraded even if the screws are loosened.

[0008]

FIG. 1 is an explanatory diagram of a transformer structure according to the present invention. In FIG. 1, 1 is a leaf spring, 2 is a transformer winding part, 3a and 3b are transformer cores, 11 is a bent part,
12 is a Z-bend, 13 is a bend, 14 is a positioning part, 15 is a bottom part, and 16 is a hole. The present invention is configured as follows in order to solve the above problems.

(1): A leaf spring 1 made of an elastic material is used. The leaf spring 1 has an inwardly bent ceiling portion and L cores that hold the transformer cores 3a and 3b from both sides of the ceiling portion.
And the transformer core 3a at the bottom,
There are provided two or more holes 16 for fixing 3b to a base plate or the like, and the bent portion 11 of the ceiling presses the center of the transformer core 3a.

(2) A transformer winding 2 having primary and secondary terminals, transformer cores 3a and 3b sandwiching the transformer winding 2 from above and below, and the transformer cores 3a and 3b are fixed. A leaf spring 1 made of an elastic material. The leaf spring 1 has an inwardly bent ceiling portion, and both arms extending in an L-shape to hold the transformer cores 3a and 3b from both sides of the ceiling portion. And the transformer core 3 at the bottom.
a, 3b to two or more holes for fixing to the base plate or the like, and the bent portion 11 of the ceiling presses the center of the transformer core 3a.

(Operation) Since the present configuration is configured as described above, the following operation is provided. Using the leaf spring 1 made of an elastic material, the transformer cores 3a and 3b are held by the arms extending in an L-shape from both sides of the ceiling of the leaf spring 1 so that the bent portion 11 of the ceiling is The center of the transformer core 3a is pressurized, and the transformer cores 3a, 3b are fixed to a base plate or the like with two or more holes 16 at the bottom. For this reason, the gap between the transformer cores 3a and 3b is not delicately changed by the tightening torque of the screw in the hole 16 for fixing the transformer core, and the characteristics of the transformer are deteriorated even if the screw is loosened. Is gone.

The transformer windings 2 having primary and secondary terminals are sandwiched between the transformer cores 3a and 3b from above and below. 3a and 3b, the center of the transformer core 3a is pressurized by a bent portion 11 of a ceiling portion bent inward, and the transformer core 3 is pressed by two or more holes 16 at the bottom.
a, 3b are fixed to a base plate or the like. For this reason, the gap between the transformer cores 3a and 3b is not delicately changed by the tightening torque of the screw in the hole 16 for fixing the transformer core, and the characteristics of the transformer are deteriorated even if the screw is loosened. Is gone.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a transformer structure according to an embodiment of the present invention. In FIG. 1, the transformer structure is such that a transformer winding portion 2 is sandwiched between transformer cores 3a and 3b and fixed by a leaf spring 1 for fixing the transformer core.

The leaf spring 1 has a bent portion 11 for pressing the center of the transformer core 3a, a Z-bend 12 for facilitating the insertion of the transformer core, and a bend 1 for facilitating the insertion of the transformer core.
3. A positioning part 14 for the transformer core, a bottom part 15 for supporting the bottom of the transformer core, and a hole 16 for screwing are provided.

The transformer winding section 2 has a primary terminal on one side and a secondary terminal on the other side.
The hole shown in FIG.

As shown in FIG. 3, the transformer cores 3a and 3b sandwich the transformer winding 2 from above and below.

FIG. 2 is an explanatory view of a method of mounting a transformer core fixing leaf spring. In FIG. 2, the leaf spring 1 for fixing the transformer core is inserted in the direction of insertion so as not to damage the appearance of the transformer core when the transformer cores 3a and 3b incorporating the transformer winding part 2 are inserted, and to facilitate the insertion. Are opened, and a Z-bend 12 and a bend 13 are arranged.

When the transformer cores 3a and 3b are inserted up to the positioning portion 14, the bent portion 11 presses the center of the transformer core 3a. The strength of the applied pressure is determined by the bending portion 11 and the bottom portion 15.
, The thickness of the plate, and the width of the plate.

The Z-bend 12 is located at the joint of the transformer core 3a and the transformer core 3b.
a, 3b, and also serves as a lock mechanism for preventing the transformer cores 3a, 3b from coming off. And the bottom 1
The screw holes 16 provided in the screw 5 enable screw mounting on a heat-dissipating base plate such as copper or aluminum having excellent thermal conductivity.

The material of the leaf spring 1 is preferably a metal that can withstand the heat generated by the transformer. For example, a spring stainless steel, phosphor bronze, or the like can be manufactured by sheet metal processing.

As described above, the leaf spring 1 has the ceiling portion (bent portion 11) bent inward, and the L-shaped springs are held so as to hold the transformer cores 3a and 3b from both sides of the ceiling portion.
It has both arms extending in the shape of a letter, and as shown in FIG. 2, by inserting the leaf spring 1 in the direction of the arrow, the bent portion 11 of the ceiling presses the center of the transformer core to fix the transformer core. can do.

For this reason, the transformer core is elastically fixed between the bent portion 11 and the bottom portion 15, and the gap between the transformer cores 3a and 3b is not delicately changed by the tightening torque of the screw. Even if the screws are loosened, the characteristics of the transformer will not deteriorate.

As described above, as described in the embodiment, anyone can assemble with stable pressurization, so that there is little variation among products. In addition, since the inspection can be performed without attaching to the base plate, the number of assembling steps can be reduced. Further, the lock of the Z-bend 12 can be easily released by opening it with the thumb and can be easily disassembled. The bending 13 provided on the positioning portion 14 has an effect of preventing the transformer core 3a from being damaged when the leaf spring 1 is removed. The screw holes 16 may be provided at two locations on the bottom 15 symmetrically with respect to the point, and any space may be used. The dead space of the transformer having the shape shown in FIG. 1 can be effectively used, and the size of the product can be reduced. be able to.

[0024]

As described above, the present invention has the following effects. (1): The transformer core is held by both arms extending in an L-shape from both sides of the ceiling portion of the leaf spring, and the bent portion of the ceiling portion presses the central portion of the transformer core, and the bottom portion of the transformer core is pressed. Since the transformer core is fixed to the base plate or the like with more than two holes, the gap of the transformer core does not change delicately by the tightening torque of the screw for fixing the transformer core, and the screw is loosened by any chance. However, the characteristics of the transformer do not deteriorate.

(2): The transformer winding portion having the primary and secondary terminals is sandwiched between the transformer cores from above and below, and the transformer core is held from both sides by the L-shaped extended arms of the leaf spring. In order to press the center of the transformer core at the bent portion of the ceiling portion bent inward and fix the transformer core to the base plate or the like with two or more holes at the bottom, tighten the screws in the holes for fixing the transformer core. Due to the torque, the gap of the transformer core does not change delicately, and even if the screw is loosened, the characteristics of the transformer will not deteriorate.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a transformer structure according to an embodiment.

FIG. 2 is an explanatory diagram of a method of attaching a transformer core fixing leaf spring in the embodiment.

FIG. 3 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leaf spring 2 Transformer winding part 3a, 3b Transformer core 11 Bent part 12 Z bending 13 Bending 14 Positioning part 15 Bottom part 16 Hole

Claims (2)

[Claims] 1. A leaf spring made of an elastic material, wherein the leaf spring has an inwardly bent ceiling, and both arms extending in an L-shape to hold a transformer core from both sides of the ceiling. A transformer core fixing structure comprising: a bottom portion having two or more holes for fixing the transformer core to a base plate or the like; and a bent portion of the ceiling presses a central portion of the transformer core. A transformer winding having primary and secondary terminals; a transformer core sandwiching the transformer winding from above and below; and a leaf spring made of an elastic material fixing the transformer core. The leaf spring secures the transformer core to a base plate or the like at a ceiling portion bent inward, both arms extending in an L-shape to hold the transformer core from both sides of the ceiling portion, and a bottom portion. Wherein the bent portion of the ceiling presses the central portion of the transformer core.