JPH06231979A - Transformer - Google Patents

Abstract

PURPOSE:To reduce the weight of a transformer by sealing either a primary-side coil or a secondary-side coil, which is a high-voltage side one, with insulating compound. CONSTITUTION:In a coil case 23, a secondary side coil K2 is loosely bit around a hanger tube 25. A secondary-side coil bobbin of the secondary-side coil K2 is constituted of a cylindrical body 28 and a plurality of flanges 29 which are formed on the outer face of the body 28. Between each two flanges 29 of the body 28, a secondary-side coil wire 30 is wound. Then, the secondary-side coil wire 30 is impregnated with insulating compound 33 to insulate the secondary- side coil K2. By this method, a transformer can be light-weighted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer such as a neon transformer.

[0002]

2. Description of the Related Art Conventionally, a primary side coil and a secondary side coil are housed in a transformer main body case. A coil wire is wound around the primary coil and the secondary coil, and when the main body case is filled with an insulating compound of a liquid material, the insulating compound is impregnated between the wires of the primary coil and the secondary coil. After that, the insulating compound is hardened and the entire primary coil and secondary coil are sealed to be insulated.

[0003]

However, since the insulating compound is filled in the entire main body case, as described above, the entire primary side coil and secondary side coil, or a part of the transformer other than the coil may be provided. The transistors that make up
Elements such as capacitors and resistors will also be sealed with an insulating compound. Therefore, there is a problem that the entire transformer becomes heavy.

An object of the present invention is to provide a transformer which can reduce the weight of the transformer.

[0005]

In order to solve the above problems, the present invention provides an insulating compound for insulation treatment in a transformer in which a primary side coil and a secondary side coil are housed in a body case. The high-voltage side coil of the primary side coil and the secondary side coil is sealed.

[0006]

In the transformer configured as described above, the high voltage side coil is sealed with the insulating compound of liquid material. Therefore, it is possible to reduce the weight of the transformer by performing the insulation treatment with a small amount of the insulation compound.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a neon transformer for supplying power to neon will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, a lid 2 (illustrated only in FIG. 2) is provided at the opening of a bottomed box-shaped body case 1. Although not shown, the lid 2 has a plurality of slit-shaped ventilation holes. A printed circuit board 3 is screwed and fixed to the inner bottom surface of the body case 1 with screws 4, 5, and 6. Near the center of the printed circuit board 3, a power transistor 7 composed of an FET that constitutes a part of an inverter circuit is connected, and a radiation fin 9 is fixed to each power transistor 7. Although not shown, elements such as a transistor, a capacitor and a resistor are connected in addition to the power transistor 7 from the vicinity of the center of the printed circuit board 3 to the lower part thereof, and an electric circuit necessary for the inverter circuit is constituted by these.

On the printed circuit board 3, there is disposed a transformer including a primary coil K1 as a low voltage side coil, a secondary side coil K2 as a high voltage side coil, and ferrite cores 34 and 35. In this embodiment, the commercial power source is first rectified, and the high frequency (several 10K
Hz) and then applied to the primary coil K1, and the secondary coil K2 is designed to generate a secondary voltage of about 9000V.

First, the primary coil K1 will be described. As shown in FIG. 4, a primary coil bobbin 17 is fixed on the printed circuit board 3. As shown in FIG.
The primary coil bobbin 17 is a body 18 having a substantially rectangular tube shape.
And collar portions 19a formed on the outer peripheral surfaces of both ends of the body 18,
And 19b. The wire diameter of the body 18 is 50
A primary coil wire 20 having a size of mm is wound.

Connector parts 21 are provided at the four corners of the lower part of the body 18.
Is formed, and a pin 22 projecting to the back side is planted in the connector 21 portion. The winding start end and winding end of the primary coil wire 20 are connected to two of the pins 22 and soldered. The primary side coil bobbin 17 is fixed to the printed board 3 by inserting the four pins 22 into the printed board 3. Further, the pair of pins 22 to which the primary side coil wire 20 is connected are connected to an inverter circuit and a rectifier circuit (not shown) on the printed circuit board 3.

Next, the secondary coil K2 will be described.
As shown in FIGS. 1 to 3, ABS is provided on the printed circuit board 3.
A coil case 23 made of resin is arranged, and both ends of its upper wall are screwed and fixed to the main body case 1 together with the printed circuit board 3 by the screws 5 and 6. The coil case 23 is formed in a bottomed box shape having an opening 23d on the upper side. As shown in FIGS. 2 and 8, the coil case 23
A hook-shaped positioning portion 24 is formed on the bottom rear surface of the coil case 23, and the coil case 23 is positioned in the vertical direction by engaging the positioning portion 24 with the side edge of the printed circuit board 3.

As shown in FIG. 8, bushing insertion ports 44 and 45 are provided on both sides of the upper portion of the side wall 23e of the coil case 23, and two notches 46 are formed in the diameter directions of both insertion ports 44 and 45, respectively. Has been done.

As shown in FIGS. 1 and 3, a pair of trapezoidal projecting portions 39 and 40 are formed on the upper portions of the left and right side walls 23a and 23b of the coil case 23 so as to project to the outside of the case 23. There is. Left and right side walls 23a of the coil case 23,
23b has a mounting hole 23c below the projecting portions 39 and 40.
The support pipe 25 is tightly fitted and supported in the mounting hole 23c so as to connect the side walls 23a and 23b. The diameter of the support tube 25 is reduced so that the outer peripheral surface is tapered from the base end to the tip. A tapered portion 25a is formed at the tip of the support tube 25, and the tapered portion 25a is formed on the side wall 23.
projected from b. A flange-shaped stopper portion 26 is formed at the base end portion of the support tube 25 so as to project in the circumferential direction.
6 is positioned and locked on the outer surface of the right side wall 23a of the coil case 23 by being engaged with the step portion 43 formed on the side wall 23a.

In the coil case 23, the support tube 25
A secondary coil K2 is loosely provided around the circumference of. The secondary coil bobbin 27 of the secondary coil K2 is a cylindrical body 2
8 and a plurality of flanges 29 (13 in this case) formed on the outer peripheral surface of the body 28, and the body 28 has a secondary coil wire having a diameter of 0.1 mm between the flanges 29. 30 is wound. The winding start end and winding end of the secondary coil wire 30 are wound around each pair of terminals 31 and 32 projecting from both ends of the secondary coil bobbin 27, and the secondary lead wire 12 introduced into the main body case 1 is introduced. , 13 are soldered together. The secondary coil bobbin 27 is connected to the secondary coil wire 3
After the varnish is impregnated in the wound state of 0, it is assembled into the coil case 23 by the support tube 25.

An insulating compound 33 is filled in the space inside the coil case 23 excluding the secondary coil bobbin 27 and the support tube 25. The insulating compound 33 is composed of a low-viscosity resin (epoxy or the like) and a filler (insulating particles such as silica sand), and is hardened after a predetermined time has passed and is integrated with the coil case 23. That is, the insulating compound 33 is impregnated between the secondary coil wires 30 to insulate the secondary coil K2. Further, bulging insulating portions 41 and 42 are formed in the bulging portions 39 and 40 by the insulating compound 33, and a sufficient creeping distance from each terminal 31, 32 of the secondary coil K2 is secured.

In the body 18 of the primary coil K1 and in the support tube 25 of the secondary coil K2, a pair of ferrite cores 34 and 35 are loosely inserted from the left and right sides. As shown in FIG. 6, the ferrite cores 34 and 35 have an E shape on the front surface, and the primary cores 34a and 35a, the secondary core 34b,
35b and leakage cores 34c and 35c. Grooves 36 are formed on the outer peripheral surfaces of the ferrite cores 34 and 35 along the circumferential direction thereof. These grooves 36
A front U-shaped stopper metal fitting 37 is engaged along with, and both ferrite cores 34 and 35 are butt-joined to each other by screwing and tightening a nut 38 at the tip of the metal stopper 37. That is, each primary core 34a, 35
The front end surfaces of a and the secondary cores 34b and 35b are in contact with each other, and a magnetic circuit can be formed as indicated by the broken line. The leakage cores 34c and 35c are separated by an interval L, and the interval L determines the current value to the secondary side.

A switch 11 for supplying power to the neon transformer is fitted on the lower side wall of the main body case 1, and a primary side lead wire 1 made of a coaxial cable.
A primary-side bushing 10 made of synthetic resin, which penetrates through 2, is fitted. The end of one wire of the primary side lead wire 12 is connected to the switch 11 in the main body case 1, and the end of another wire is connected to the inverter circuit via the printed circuit board 3.

On the other hand, secondary side bushings 13 and 14 made of synthetic resin and fitted with secondary side lead wires 15 and 16 on the load side are fitted to the upper side wall of the main body case 1. The ends of the lead wires 15 and 16 are connected to the terminals 31 and 32 of the secondary coil K2 in the body case 1, respectively. The lead wires 12, 15, 16 are immovable relative to the bushings 10, 13, 14 by welding their coatings to the bushings 10, 13, 14. When the lid 2 is attached to the main body case 1, the main body case 1
And is supported by being sandwiched by the lid body 2.

As shown in FIG. 9, the bushing 10,
Reference numerals 13 and 14 denote a main body portion 47 that abuts the outer surface of the main body case 1.
The main body case 1 includes a small diameter portion 48, and a stopper portion 49 that contacts the inner surface of the main body case 1. Further, the coil case 23 is provided at the inner end of the bushing 13.
Small-diameter portion 50 to be inserted into the bushing insertion ports 44 and 45 of
Is formed, and an engaging projection 51 that can pass through the notch 46 is provided in the diametrical direction. The engagement protrusion 51 is adapted to engage with the inner surface of the coil case 23 and prevent the bushing 13 from coming out of the coil case 23.

The engaging projection 51 has a coil case 23.
And a sandwiching projection 52 is formed on the inner surface side of the sandwiching projection 5
2 is formed such that an intermediate portion thereof enters the notch 44 and an outer end portion thereof is located outside the side wall 23e. Then, the small diameter portion 50 of the bushing 13 is inserted into the bushing insertion opening 44 and the bushing 13 is rotated, whereby the sandwiching projection 52 engages with the corner portion of the side wall 23e and the stopper portion 49 closes the side wall 23e. It is designed to be pressed against the outer surface of. Thereby, when the insulating compound 33 is filled in the coil case 23, the insulating compound 33 is prevented from leaking from the bushing insertion port 44 and the notch 46.

A pair of detents 53 are cut out on the outer periphery of the stopper portion 49, and the detents 53 in the primary side bushing 10 project from the lid 2 into the body case 1. The bushing is prevented from rotating by engaging with the restriction piece 54.

Now, the varnish-impregnated secondary coil bobbin 27 and the support tube 25 are assembled in the coil case 23 of the neon transformer having such a configuration. The winding start end and winding end of the secondary coil wire 30 are connected to the terminals 31 and 32 of the secondary coil bobbin 27, and the secondary lead wires 15 and 1 are connected.
Weld 6 by soldering. That is, the winding start end of the secondary coil wire 30 is connected to the secondary lead wire 15, and the winding end end of the secondary coil wire 30 is connected to the secondary lead wire 16.

After that, the insulating compound 3 softened in the remaining space excluding the secondary coil bobbin 27 and the support tube 25.
3 is filled, and the insulating compound 33 is impregnated between each wire of the secondary coil wire 30, so that the insulating compound 33 can be filled in a short time.
Is cured and insulated. Even if the insulating compound 33 leaks from between the tip of the support tube 25 and the mounting hole 23c of the coil case 23 before it is filled with the insulating compound 33, the insulating compound 33 leaks.
Does not flow into the support tube 25 because it flows along the tapered portion 25 a of the support tube 25. After that, the positioning portion 24 is engaged with the printed circuit board 3 to perform vertical positioning,
The coil case 23 is tightened and fixed to the main body case 1 via the printed circuit board 3 with screws 5 and 6.

Therefore, in this embodiment, the secondary coil K2, which is the high voltage side coil, is sealed with the insulating compound 33 for insulation treatment. Therefore, unlike the prior art, by sealing only the secondary coil K2 with the insulating compound 33, the neon transformer can be made lighter, and the workability of attaching the main body case 1 to a wall or the like is improved.

Further, unlike the prior art, since the secondary coil K2 can be insulated with a small amount of the insulating compound 33, the curing time of the insulating compound 33 can be shortened and the delivery time for manufacturing can be shortened. At the same time, the manufacturing cost can be reduced.

Further, since the coil case 23 and the printed circuit board 3 are fixed to the main body case 1 by common screws 5 and 6, the work efficiency is improved by making the assembling work common. The manufacturing cost can be reduced. Further, by engaging the positioning portion 24 with the printed circuit board 3, the coil case 23 can be easily positioned in the vertical direction, so that the work efficiency of attaching the coil case 23 to the printed circuit board 3 is improved.

The present invention is not limited to the above-mentioned embodiments, but may be modified as follows without departing from the spirit of the present invention. (1) In the above embodiment, the secondary coil K2 on the high voltage side was sealed with the insulating compound 33. However, in addition to this, the winding ratio of the primary coil wire 20 and the secondary coil wire 30 may be changed. The primary coil K1 may be on the high voltage side and the primary coil K1 may be on the low voltage side, and only the primary coil K1 may be sealed with the insulating compound 33.

(2) The coil case 23 and the support tube 25 may be made of a material other than ABS. (3) In addition to the insulating compound 33 described above, a heat-plasticizable insulating material containing asphalt as a main component may be used.

[0030]

As described above in detail, according to the present invention, it is possible to reduce the weight of the transformer.

[Brief description of drawings]

FIG. 1 is a front view showing the inside of a transformer in this embodiment.

FIG. 2 is a side view showing the inside of the transformer.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a cross-sectional view showing an engagement state between a positioning portion of the coil case and a printed circuit board.

FIG. 6 is a front view showing an assembled state of a ferrite core.

FIG. 7 is a front view showing a coil case.

FIG. 8 is a side view of the coil case showing a bushing insertion port.

FIG. 9 is a side view of the secondary side and primary side bushings.

FIG. 10 is a front view of the secondary side and primary side bushings.

FIG. 11 is a plan view showing an engaged state of the coil case and the bushing.

[Explanation of symbols]

1 ... Main body case, 33 ... Insulation compound, K1 ... Primary coil, K2 ... Secondary coil

Claims (1)

[Claims] 1. A primary coil (K) is provided in a body case (1).
1) and a secondary coil (K2) are housed in a transformer, an insulating compound (33) for insulation treatment is used to reduce the high voltage of the primary coil (K1) and the secondary coil (K2). A transformer characterized in that the side coil is sealed.