JPS6236267Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses a transformer having an iron core formed by laminating a plurality of thin amorphous magnetic plates and a heat radiation casing for dissipating the heat generated from the iron core into the outside air. This relates to a fixing device for an iron core.

Amorphous magnetic plates are amorphous magnetic materials that have higher magnetic flux density than conventional magnetic materials such as silicon steel plates and have less core loss due to high frequencies, but their magnetic properties deteriorate due to internal stress caused by external forces. It has a nature. Therefore, when constructing an iron core by laminating these magnetic plates, the mechanical and thermal connection between the iron core and the heat dissipation casing requires a fixing method that does not cause mechanical strain in the magnetic path of the iron core. For example, as shown in FIG. 1, an E-type primary core 1 and a secondary core 2 are constructed by laminating amorphous magnetic plates.
The end faces of the laminated surfaces of the heat dissipating casings 3 and 4 respectively
As a method of fixing it in close contact with
U-shaped notches 1b and 2b are provided at both corner portions of the iron cores 1 and 2, respectively.
When the holding pieces 11 and 12 are inserted into the inside of the notch 1 and fixed by tightening bolts, the notch 1
The holding pieces 21, 22 are used in order to prevent stress from being applied to the portions clamped between the inner surfaces of b and 2b and the contact surfaces of the heat dissipation casings 3 and 4, and to prevent the iron core from wobbling in the left-right direction in the drawing. The problem is that internal stress is generated within the core over a wide range as shown by the mesh in the drawing, and this extends into the magnetic path, deteriorating the magnetic properties.

In the figure, 5 is the primary winding wound around the primary iron core 1, 6 is the secondary winding wound around the secondary iron core 2, and 7 and 8 are the windings of the heat dissipation casings 3 and 4. End plates are attached to the front and rear to sandwich the cores 1 and 2, 9 is a fixing bolt that fixes the heat dissipation casings 3 and 4 and connects the primary core 1 and the secondary core 2, and 10 is a heat dissipation casing. Cooling fins 3 and 4 are provided outside, and 11 indicates a magnetic path.

The object of the present invention is to prevent deterioration of magnetic properties in the method of fixing an iron core as described above.

Hereinafter, the present invention will be explained based on the embodiment shown in FIGS. 2 and 3. Inwardly inclined slopes 1 are located near the upper corners of both sides of the laminated surface of the iron core 1.
A V-groove having a diameter is provided. Although the slope 1a is a flat surface in this drawing, it may be a curved surface if the curvature is small.

A U-shaped groove 14 is provided on the inner surface of the heat dissipation casing 3 facing the V-groove, and a clamp rod 12 is provided between the lower surface of this groove 14 and the slope 1a of the iron core 1.
Insert. As a method of pressing this clamp rod 12, as shown in FIG.
There is a method in which a plurality of screw holes opening in the U-shaped groove 14 are provided on the side surface of the casing, and the clamp rod 12 is evenly pressed with bolts 13 screwed into the screw holes. A plurality of holes are formed in the side surface of 3 with internal threads cut halfway through and the diameter of the tip is reduced, and a protruding piece 15 that protrudes into the U-shaped groove 14 is inserted into the tip of the hole. This protruding piece 15
is pressed by the spring 16 and screw 17 to clamp the clamp rod 1.
There is a method of pressing 2. With the configuration shown in FIG. 3, the protruding piece 15 can slide back and forth within the hole, so if the longitudinal tip of the clamp rod 12 and the tip of the protruding piece 15 are rounded, the protruding piece 15 can slide back and forth within the hole. The clamp rod 12 can be inserted after installing 15 in the heat dissipation casing 3. Also screw 1
The clamp rod 11 can be pulled out without loosening the clamp 7.

In this way, the clamp rod 12 pressed from the side of the heat dissipation casing 3 presses the slope of the iron core 1 in the normal direction, and the pressing force is divided into horizontal and vertical directions. The upper surface of the iron core 1 is fixed in close contact with the heat dissipation casing 3, and is also fixed in the horizontal direction. Therefore, the heat generated in the iron core 1 is radiated to the outside through the cooling fins 10 from the portion in close contact with the heat radiation casing 3. If thermally conductive grease is applied to this contact area, heat transfer will be further improved and the heat radiation effect can be improved.

Note that the clamp rod 12 does not have to be a round rod, but has a slope 1.
The part in contact with a may be rounded, or the slope may have the same slope as the slope 1a. Further, the iron core may have an integral structure instead of the divided structure as shown.

As described above, the present invention provides an iron core fixing device that tightly fixes the end face of the laminated surface of an iron core formed by laminating and fixing a plurality of thin amorphous magnetic plates to the inner surface of a heat dissipation casing. A groove having an inclined surface is formed on both sides near the end surface of the laminated surface, and at least one clamp rod is disposed between the casing and the groove and comes into contact with the inclined surface of the groove, and the clamp By pressing the rod from the casing side, the end face of the laminated surface of the iron core and the heat dissipation casing are fixed in close contact with each other, so the core and the heat dissipation casing can be fixed simultaneously in the vertical and horizontal directions. Sufficient fixation can be achieved without applying a large force, and the internal stress generated within the core is limited to the corners of the core, which are outside the magnetic path, as shown by the mesh in Figures 2 and 3. This prevents deterioration of characteristics and maximizes the advantages of the amorphous magnetic plate.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a transformer showing a comparative example of the present invention, and FIGS. 2 and 3 are enlarged views of essential parts showing the configuration of an embodiment of the present invention, respectively. 1...Primary side core, 2...Secondary side core, 3, 4
...Radiation casing, 5...Primary winding, 6...
Secondary winding, 7, 8... End plate, 9... Fixing bolt, 10... Cooling fin, 11... Magnetic path, 1a...
...Slope, 12...Clamp rod, 13...Bolt,
14... U-shaped groove, 15... Projecting piece, 16... Spring, 17... Screw.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In an iron core fixing device that tightly fixes the end face of the laminated surface of an iron core formed by laminating and fixing a plurality of thin amorphous magnetic plates to the inner surface of a heat dissipation casing, A groove having an inclined surface is formed on both sides of the surface near the end surface of the laminated surface, and at least one clamp rod is disposed between the casing and the groove and comes into contact with the inclined surface of the groove. An iron core fixing device characterized in that it is configured to tightly fix the laminated surface end face of the iron core and the heat radiation casing by pressing a clamp rod from the casing side. 2 Utility model registration claim 1 characterized in that cooling fins are formed in the vicinity of the portion of the heat dissipation casing where the end face of the laminated surface of the iron core is in close contact.
Iron core fixing device as described in section. 3. The iron core according to claim 1 or 2, wherein the clamp rod is configured to be pressed by the tip of a bolt that is screwed into a plurality of screw holes provided on the side surface of the heat dissipation casing. fixation device. 4. The iron core according to any one of claims 1 to 3 of the claims for utility model registration, characterized in that the close contact between the end face of the laminated portion of the iron core and the inner surface of the heat dissipation casing is filled with thermally conductive grease. fixation device.