JPH0330404A - Transformer - Google Patents

Abstract

PURPOSE:To prevent the movement of gap formed between closed magnetic passage cores, and to obtain a transformer having complete insulation between the cores and windings by a method wherein the gap of the cores is formed by the intermediate wall of an insulated substrate, and also between the closed magnetic passage and the surface of windings is insulated by the insulating barrier provided on an insulated substrate. CONSTITUTION:In a transformer wherein the opposing surfaces of at least two dividable closed magnetic circuit core B are butt-jointed and the windings 10 to 12 such as a primary winding 10, a secondary winding 11 and the like are wound on either of the two closed magnetic circuit cores 15 and 16 or on both of them, a gap is formed between the opposing surfaces of the divided cores B to be butt-jointed by the intermediate wall 17 which is installed in upright position on an insulated substrate for retention of the above-mentioned divided cores B. The divided cores B are supported in a fixed manner by pressing the opposing surfaces of the divided cores B using the fixture 20 attached to the side walls 19 and 20 which are installed in an upright position from both sides of the above-mentioned insulated substrate, and an insulating barrier is formed between the closed magnetic passage cores B and the outer surface of the windings 10 to 12 such as the primary winding 10, the secondary winding 11 and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a transformer, and particularly to a transformer for consumer electrical equipment.

(Prior art and problems to be solved by the invention) Transformers for recent consumer electrical equipment, such as microwave oven transformers, are high-frequency transformers that use ferrite iron cores to make them smaller, lighter, and more energy efficient. is often used.

This transformer interlinks magnetic flux from a primary winding wound around a closed magnetic circuit iron core made of a ferrite iron core or the like with a secondary winding, thereby generating a large voltage in the secondary winding. In this voltage conversion, when voltage fluctuation occurs in the primary winding, large voltage fluctuation occurs in the secondary winding, so a gap is provided in the closed magnetic circuit iron core of the ferrite iron core of this type of transformer, and a spacer is installed in this gap. It is being This spacer is usually fixed to the opposing surface of the ferrite iron core with adhesive or adhesive tape.

By the way, when a transformer configured in this manner is used for a long period of time, the adhesive force of the adhesive or the like decreases and the spacer moves, which may widen the gap between the ferrite cores or cause the opposed surfaces of the ferrite cores to shift. Therefore, there are problems such as the electrical characteristics of the transformer fluctuating or becoming mechanically weak, making it impossible to use the transformer reliably. .

In addition, in this type of transformer, insulating paper or a separate insulating resin material is installed to maintain the insulation distance between the ferrite iron core and the winding, but this increases the number of parts and complicates the structure. However, there was a problem that the assembly was troublesome.

In order to solve the above problems, the present invention provides a transformer that prevents the gap formed between the closed magnetic circuit iron cores from moving and provides sufficient insulation between the iron core and the windings. .

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a cross-joint connection of the opposing surfaces of a closed magnetic circuit core that can be divided into at least two parts, and also connects either one or each of the two closed magnetic circuit cores to each other. In a transformer wound with windings such as a primary winding and a secondary winding, a gap is formed between opposing surfaces of the split iron cores that are joined together by an intermediate wall erected from an insulating substrate, The opposing faces of the split iron core are pressed against the intermediate wall by fixtures attached to side walls erected from both sides of the insulating substrate, and the closed magnetic path iron is fixedly supported by the partition walls provided on the insulating substrate. It is intended to form an insulating partition between the core and the outer surface of the windings such as the primary winding and the secondary winding.

(Function) The alternating magnetic flux of the primary winding interlinks with the windings such as the secondary winding, and a converted voltage corresponding to the number of turns is generated in the windings such as the secondary winding. In this voltage conversion, alternating magnetic flux generated in the primary winding and the like is suppressed by the gap formed in the closed magnetic path, thereby preventing voltage fluctuations. Moreover, the gap formed between the split iron cores is formed by pressing and supporting the split iron cores on the intermediate wall erected from the insulating substrate with the fixtures on the side walls. No deviation occurs.

Furthermore, since the partition wall is inserted between the divided iron core and the outer periphery of the windings such as the primary winding and the secondary winding, there is no need to separately provide insulating paper or the like.

(Embodiment) An embodiment in which the transformer of the present invention is applied to a microwave oven will be described below with reference to the accompanying drawings.

In FIG. 1, a high-frequency transformer A includes a magnetic core B that forms a closed magnetic path equipped with a primary winding 10, a secondary winding 11, and a filament winding 13112, and an insulating substrate C that fixedly supports this magnetic core B. The insulating substrate C of the high frequency transformer A is fixed to the base 13 of the microwave oven with screws 14 and 14.

For example, as shown in FIG. 2(a), the magnetic iron core B includes two substantially zero-shaped divided ferrite iron cores 15 and 16 facing each other.
5a and 16B are bonded to the intermediate wall 17 of the insulating substrate C to form a closed magnetic path.

One of the divided ferrite iron cores 15 of the magnetic iron cores B is composed of a rectangular leg portion 15b, a round arm portion 15c, and a yoke portion 15d that connects the leg portion 15b and the arm portion 15c. has been done. The leg portions 15b of the divided ferrite iron core 15 are supported by the base 18 of the insulating substrate C, and the arm portions 15b are supported by the base 18 of the insulating substrate C.
The primary winding 10 etc. are attached to 5c.

Further, the yoke portion 15d has one side wall 19 of the insulating substrate C.
A dowel hole 21.21 is formed to be pressed and supported by a tap screw 20 attached to the holder.

Other split ferrite iron cores 16 are also split ferrite iron cores 15.
It is constructed in substantially the same manner as shown in FIG. 1, and is composed of a rectangular leg portion 16b, a round arm portion 16c, and a yoke portion 16d that connects the leg portion 16b and arm portion 16c. The leg portions 16b of the divided ferrite iron core 16 are supported by the base 18 of the insulating substrate C, and the secondary winding 11 and the like are attached to the arm portions 16c.

Further, the other side wall 22 of the insulating substrate C is provided on the yoke portion 16d.
A dowel hole 21.21 is formed which is pressed and supported by a tap screw 20.20 attached to the holder.

The insulating substrate C is formed by molding synthetic resin or other insulating material as shown in FIG. 2(b), for example.

This insulating substrate C has the intermediate wall 17 and left and right side walls 19.degree. 22 erected on a flat base 18 at appropriate intervals. The height of the intermediate wall 17 is equal to that of the left and right side walls 19.2.
A partition wall 23 is provided on the upper part of the intermediate wall 17 and extends parallel to the base unit 8. Both ends 23a and 23b of this partition wall 23 are Attached are upwardly extending vaginal walls 24a, 24b.

These are the base 18, side wall 19. The intermediate wall 17, the left side of the partition wall 23, and the vaginal wall 24a form a substantially L-shaped cavity M into which the leg portions 15b and yoke portions 15d of the split ferrite iron core 15 can be inserted. The arm portions 15c of the split ferrite iron core 15 are supported.

Furthermore, the base 18, the side wall 22. Intermediate wall 17, partition wall 23
On the right side of the vagina wall 24b, the divided ferrite iron core 16
A substantially L-shaped space N is formed into which the leg portion 16b and the yoke portion 16d can be inserted, and the arm portion 16c of the split ferrite core 16 is supported on the vaginal wall 24b. . These are the bases 18 that constitute the void M and the void N,
Side wall 19.22. A support wall 25 is provided on the back side of the intermediate wall 17, etc.
are provided, a base 18, side walls 19, 22 . They are connected so that predetermined relative positions of the intermediate wall 17 and the like are maintained.

Note that 26 and 26 are screw holes drilled in the base 18 of the insulating substrate C. A screw 14.14 is inserted into the hole 26.26 of the insulating substrate C, and the insulating substrate C is fixedly supported on the base 13 of the microwave oven by the screw 14.14.

Further, 27.27 is the side wall 19 or 22 of the insulating substrate C.
This is a tap screw hole drilled in the. This tapped screw hole 2
A tap screw 20° 20 is inserted into 7.27, and the opposing surface 15a of the split ferrite iron core 15 or the opposing surface 16a of the split ferrite iron core 6 is inserted through the notch holes 21.21 of each yoke portion 15d, 16d. It is pressed against the intermediate wall 17, and the opposing surface 15a or 16a is pressed and supported by the intermediate wall 17.

The primary winding 1o is formed by winding an appropriate number of windings around an insulating bobbin 28, and is attached to the arm portion 15c of the split ferrite iron core 15.

The secondary winding 11 is formed by winding an appropriate number of windings around two insulating bobbins.
is attached to the arm portion 16c of the user. Further, the filament winding 2 is wound around the outer circumference of the secondary winding 11 several times. Note that 30, 31.32 are the primary winding 10. This is a terminal for supplying or taking out AC voltage to the secondary winding 11 and the filament winding 12.

To assemble a transformer from such components, proceed as follows. First, the primary winding 10 wound around the bobbin 28 is attached to the arm portion 15c of the ferrite iron core 15. Moreover, the secondary winding 11 and the filament winding 12 wound around the bobbin 31 are attached to the arm portion 16c of the ferrite iron core 16.

Next, the opposing surface 15a of the leg portion 15b of the ferrite iron core 15 to which the primary winding 10 is attached is attached to the intermediate wall 17, and the yoke 1
5d is inserted into the space M so as to be located between the side wall 19 and the vaginal wall 24a. The space N is arranged so that the opposing surface 16a of the leg portion 16b of the ferrite iron core 16 to which the secondary winding 11 etc. are attached is located on the intermediate wall 17, and the yoke 16d is located between the side wall 22 and the vaginal wall 24b. inserted into. In this case, the arm portion 15c of the ferrite iron core 15 equipped with the primary winding 10 is supported by the vaginal wall 24a, and the outer peripheral portion of the primary winding 1o and the arm portion 15c are supported by the vaginal wall 24a.
A wrap L is formed to maintain an appropriate insulation distance between the two. In addition, a ferrite iron core 16 equipped with a secondary winding 11, etc.
The arm portion 16c is supported by the vaginal wall 24b, and a wrap L is formed between the outer periphery of the secondary winding 11 and the arm portion 16c to maintain an appropriate insulation distance. Further, the outer periphery of the primary winding 1° and the leg 15b and the outer periphery of the secondary winding 11 and the leg 1
An insulating wall is formed between the partition wall 2B and the partition wall 6b.

Yoke part 15 of ferrite iron core 15 arranged in this way
The tap screw hole 27.2 of the side wall 19 is inserted into the hole 21 of d.
A tap screw 20.20 screwed together from 7 is inserted, and the facing surface 15a of the ferrite iron core 15 is pressed against the facing surface of the intermediate wall 17 via the notched hole 21 by the tap screw 20.20. Further, a tap screw 20.20 screwed together from a tap screw hole 27.27 of the side wall 22 is inserted into the notch hole 21 of the yoke portion 16d of the ferrite iron core 16, and the opposing surface 16g of the ferrite iron core 16 is inserted into the intermediate wall 17. is suppressed and supported by the opposing side.

In this way, the facing surface 15a of the ferrite iron core 15 and the facing surface 16a of the ferrite iron core 16 are pressed against the intermediate wall 17 by the tap screw 20, and a closed magnetic path having a strong gap T regulated by the intermediate wall 17 is formed. and the transformer is assembled.

The insulating board of this transformer is fixed to the base 13 of the microwave oven with screws 14, 14, and is used as a power supply path for the magnetron.

In this way, the ferrite iron core with the winding attached was attached to the insulating substrate, and a gap was created by pressing the opposite surface of the ferrite iron core against the intermediate wall using the tap screw on the side wall, so even if there is a change in lH degree, etc. The position of the ferrite iron core does not shift.

Further, since the insulating substrate is made of an insulating material, it is possible to maintain a predetermined insulating distance between the winding wire and the ferrite iron core even during winter weather.

In the above embodiment, the closed magnetic circuit was constructed with a ferrite iron core, but any magnetic iron core of good quality may be used.Although two U-shaped magnetic iron cores were used as the magnetic iron core structure, a U-shape and a single-shape An iron core such as a bonded iron core may also be used.

In addition, the partition wall of the insulating substrate was provided on the upper part of the intermediate wall with the height of 1/3 of the side wall, but the height of the intermediate wall was set to the height of the side wall, and this intermediate wall was used to intervene on both sides of the iron core. At the same time, the partition wall may be provided in the middle part of the intermediate wall, or may be provided on the side wall, etc., and the partition wall may be appropriately changed and used.

〔Effect of the invention〕

In the transformer of the present invention, the gap between the iron core with the winding attached is formed by the intermediate wall of the insulating substrate, and this iron core is supported by being pressed against the intermediate wall by a tap screw attached to the insulating substrate. It is easy to assemble, and even if subjected to temperature changes due to long-term use, the position of the iron core will not shift and the electrical characteristics will not be impaired.

In addition, since insulation is provided between the closed magnetic circuit iron core and the windings such as the primary and secondary windings by the insulating partition wall provided on the insulating substrate, the windings can be connected without using separate parts of insulating material. and the iron core.

J] Engraving of t7H (no changes in content)

[Brief explanation of drawings]

Fig. 1 is a side view of the transformer of the present invention, partially shown in cross section;
Figure (a) is a perspective view of a magnetic iron core used in the transformer shown in Figure 1, and Figure W&2 (b) is a perspective view of an insulating substrate used in the transformer shown in Figure 1. 10...Primary winding, 11...Secondary winding, 12...
Filament winding, 13... Base, 14... Screw, 15.16... Magnetic iron core, 17... Intermediate wall, 19
．． 22...Side wall, 20...Tap screw, 23...
Partition wall, 24a, 24b...vaginal wall, 25...support wall,
27...Tap screw hole, 28.29...Bobbin. Figure 1 Procedure Ura Masaaki

Claims (1)

[Claims] The opposing surfaces of closed magnetic circuit iron cores that can be divided into at least two parts are joined together, and a primary winding, a secondary winding, etc. are wound around either one of the two closed magnetic circuit iron cores or each iron core. In the transformer in which the wire is wound, a gap is formed between the opposing surfaces of the split cores that are joined together by an intermediate wall erected from the insulating board for holding the split cores, and both sides of the insulating board The facing surface of the divided iron core is fixedly supported by being pressed against the intermediate wall by a fixture attached to a side wall erected from the side wall, and the closed magnetic circuit iron core and the primary winding are fixedly supported by a partition wall provided on the insulating substrate. A transformer characterized by forming an insulating partition between the outer surface of a winding such as a wire or a secondary winding.