JPH0532983Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to transformers used in high-frequency inverter transformers used in magnetron drive devices, etc., and flyback transformers used in display devices such as televisions using CRTs. It is.

Conventional technology This type of transformer uses a U-shaped core, one magnetic leg is wound with a wire, and a gap paper made of a plate-like non-magnetic material is inserted into the abutting surface of the core to increase magnetic resistance. The required inductance was obtained by increasing the height.

Figure 3 shows a conventional transformer.
1' is a U-shaped core, 2 is a winding, 3 is a U-shaped core 1,
This is a gap paper inserted into the joint 1'. 4
is a linear metal fitting for fixing the core, and uses spring elasticity to hold the U-shaped cores 1, 1' vertically. 5,
Reference numeral 5' denotes a magnetic leg of the U-shaped cores 1, 1', which has a circular cross section and has a groove 6 on its outer surface for passing the linear metal fitting 4 therethrough.

Problems to be solved by the invention In such a conventional configuration, the U-shaped cores 1, 1'
The magnetic legs 5, 5' and the linear metal fitting 4 are in contact with each other,
The U-shaped cores 1, 1' have a disadvantage in that the vibrations at the point of contact with the wire fitting 4 produce a loud noise because magnetostrictive vibrations peculiar to magnetic materials occur. Since the linear metal fitting 4 is hard, it is particularly difficult to use the magnetic legs 5 and 1 of the U-shaped cores 1 and 1'.
If the contact was made with a relatively weak force to 5', the sound was likely to be produced.

Furthermore, in the conventional configuration, a plate-shaped material is used as the gap paper 3, so when inserting it into the joint surface of the U-shaped cores 1 and 1', it is difficult to control the position, and it easily comes off, making it difficult to work. There were flaws.

In addition, in the conventional configuration, the gap paper 3 tends to shift when the magnetic legs 5, 5' of the U-shaped cores 1, 1' are butted, and even after being fixed with the linear metal fittings 4, it may shift due to lateral force. It is difficult to work with, and requires the use of adhesive to fix it.

This invention solves these problems,
The purpose is to prevent the generation of noise due to vibration and to improve workability during transformer assembly.

Means for Solving the Problem In order to solve this problem, the present invention has a winding attached to one magnetic leg, and a U-shaped core having a groove on the outer surface of the other magnetic leg. A gap-forming spacer part, a cylindrical part with a partially open peripheral wall surrounding the gap-forming spacer part, and a semi-cylindrical protrusion inscribed in the groove of the U-shaped core are integrated. A molded gap structure is provided,
The semi-cylindrical protrusion is configured to hold a linear metal fitting for fixing the U-shaped core.

Function In this configuration, the semicircular protrusion provided on the gap structure integrally molded using resin can be easily and reliably set between the linear metal fitting and the magnetic leg without mutually adjusting them. With this configuration, the magnetostrictive vibration of the U-shaped core is absorbed by the semicircular protrusion molded with resin and is not directly transmitted to the linear metal fittings, which prevents the generation of vibration noise and further reduces the gap formation spacer part. By virtue of the cylindrical portion with a partially open peripheral wall surrounding the gap structure, it is possible to prevent the gap member from coming off and to prevent the magnetic legs of the U-shaped core from shifting.

Embodiment FIG. 1 is a perspective view of a transformer according to an embodiment of the present invention. In Fig. 1, 7 and 7' are U-shaped cores made of ferrite, etc., and a winding 8 is attached to one magnetic leg of the open magnetic path formed by these U-shaped cores 7 and 7'. has been done. This U-shaped core 7,
A semicircular groove 9 is formed on the outer surface of one magnetic leg on the side where the winding 8 is not wound in 7', and a U-shaped wire fitting 10 having spring elasticity is incorporated into this groove 9. Re,
The U-shaped cores 7 and 7' are fixed in abutted state. 11 is a gap structure. FIG. 2 is a perspective view showing the gap structure 11.
In FIG. 2, reference numeral 12 denotes a spacer portion for forming a gap, which has the required uniform thickness.
A semi-cylindrical protrusion 14 is integrally molded with a resin into the open part 3 of the gap forming spacer part 12, and the material is PPO, PET, PBT, etc., which has good dimensional stability and is rich in moldability. Also, thermoplastic resins, which are softer than thermosetting resins, are suitable, but there is no need to limit the material as long as it has similar functions.

As shown in FIG. 1, the semi-cylindrical protrusion 14 is
It is configured to fit into the groove 9 provided in the magnetic legs 15, 15' of the shaped cores 7, 7', and a linear metal fitting 10 is incorporated in this semi-cylindrical protrusion 14 so as to be in contact therewith. As a result, the linear metal fitting 10 is attached to the magnetic legs 15,1.
In the groove 9 of 5', the U-shaped cores 7, 7' are held by semi-cylindrical protrusions 14 without directly contacting them.

Furthermore, the cylindrical portion 13 can prevent the magnetic legs 15, 15' from shifting.

In the embodiment, the linear metal fitting 10 has a substantially U-shape, but the same effect can be obtained even if a rod-shaped screw is used.

Effects of the invention As described above, according to the invention, since it has a semi-cylindrical protrusion that holds the linear metal fitting and prevents it from slipping,
The magnetostrictive vibration of the U-shaped core is absorbed by the semicircular convex molded with resin and is not directly transmitted to the linear metal fittings, which prevents the generation of vibration noise and allows the gap-forming spacer part and the cylindrical part to be integrated. Therefore, it is possible to easily prevent the gap structure from coming off and the magnetic legs from shifting without adjusting the linear metal fittings and the magnetic legs, and there is no need to use adhesive to fix them, which improves work efficiency. It is possible to provide a transformer that is highly mass-producible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a transformer according to an embodiment of the present invention, FIG. 2 is a perspective view of an embodiment of the gap structure of the transformer according to the same embodiment, and FIG. 3 is a perspective view of a conventional transformer. It is a diagram. 7, 7'...U-shaped core, 8...Winding, 9...U
Groove of shaped core, 10... linear metal fitting, 11... gap structure, 12... gap forming spacer part,
13... Cylindrical part, 14... Semi-cylindrical convexity, 15,1
5'...magnetic leg.

Claims (1)

[Scope of utility model registration request] A winding is attached to one magnetic leg part, and a gap forming spacer part is attached to the abutting surface of a U-shaped core having a groove on the outer surface of the other magnetic leg part, and a gap forming spacer part is attached so as to surround this gap forming spacer part. A gap structure is attached, which is integrally formed with a cylindrical part with a partially open peripheral wall and a semi-cylindrical protrusion inscribed in the groove of the U-shaped core, and the semi-cylindrical protrusion is , a transformer that holds a core fixing wire metal fitting that fixes a U-shaped core.