JPH0335511A - Method of adhering core of transformer - Google Patents

Abstract

PURPOSE:To raise the temperature of a thermosetting adhesive in a short period of time and to cure it by filling the adhesive having conductivity in one gap, filling a nonconductive spacer and a normal temperature curable nonconductive adhesive in the other gap when the end of a first core and the end of a second core are abutted against each other, and conducting to cure the thermosetting adhesive. CONSTITUTION:A spacer 2a having conductivity is filled between the end 1a1 of a leg 1a of a core 1 and the end 11a1 of a leg 11a of a core 11 together with thermosetting adhesive 3a, and nonconductive spacer 2b is filled between the end 1b1 of a leg 1b of the core 1 and the end 11b1 of a leg 11b of the core 11 together with normal temperature curable adhesive 3b. After the adhesive 3a is cured by heat generated from the spacer 2a by conducting, the adhesive 3b is cured to electrically and mechanically couple the legs 1a, 1b of the core 1 to the legs 11a, 11b of the core 11 fixedly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for bonding the core of a flyback transformer that supplies high voltage to a picture tube used in a television receiver or the like.

(Prior Art) Conventionally, the following two methods have been mainly used to bond the core.

The first method is to use the joint surface of the core legs (the first
Legs 1a and 1b of core 1 and leg 11a of core 11 shown in the figure,
Apply a thermosetting adhesive to the joint surface with the
After heating to 00 to 120° C. for 1 to 2 hours and cooling for about 4 hours, the tightening jig was removed.

The second method is to temporarily fix the core with a core band, apply adhesive to the joint surface of the core and the core band, and leave it for 3 to 10 hours to dry the adhesive naturally. It was glued together.

The present applicant proposed a third method for the bow of Japanese Patent Application No. 63-331302, in which a thermosetting adhesive is used and the adhesive is thermosetted by passing an electric current through the core.

(Problems to be Solved by the Present Invention) The first method described above requires a jig and a drying oven for core tightening! The drawback is that FJ manufacturing costs are high, and the heating time in the drying oven takes 1 to 2 hours, followed by about 4 hours of cooling time, which results in long production times and poor workability. There were drawbacks. Furthermore, even if you want to increase the temperature of the drying oven to shorten the heating time in the drying oven, the heat resistance temperature and thermal expansion coefficient of the other constituent materials of the flyback transformer, such as the insulating resin, diode, and coil bobbin material, There was a problem in that the temperature could not be raised to 120°C or higher because peeling at the interface due to the difference was a problem.

In addition, in the second method described above, a core band is required, and the adhesive must be handled to prevent it from adhering to anything else until it dries, and it takes 3 to 10 hours to dry. The problem was that it was difficult to handle and had extremely poor workability.

In the third method shown in Japanese Patent Application No. 63-331302q, since the internal resistance of the core itself varies, the current flowing to the tips of the left and right legs is biased, and the current applied to the tips of each leg is uneven. The heat generation of the adhesive also causes unevenness,
It was difficult to obtain uniform curing on both legs, and the quality, especially the core adhesive strength, was unreliable.

Furthermore, with this method, it was impossible to uniformly cure the adhesive in the case of one side gapless type.

Therefore, in order to solve the above problems, the present invention has the following (1)
) to (3) are proposed.

(1) When gluing the core, a conductive thermosetting adhesive is used on one leg, the heat generated by electricity is used to harden this adhesive, and a non-conductive spacer is used on the other leg. Gradually cure using a non-conductive room-temperature curing adhesive.

■When gluing the core, use a conductive spacer and thermosetting adhesive on one leg, use the heat generated by the spacer to harden the adhesive, and use a non-conductive spacer on the other leg. The spacer is gradually cured using a non-conductive room-temperature curing adhesive.

(3) When gluing the core, use a thermosetting adhesive on one leg, apply electricity to the core itself to generate heat and harden the adhesive, and use a non-conductive room temperature curing adhesive on the other leg. Gradually harden using

(Means for Solving the Problems) As a means for achieving the above object, we propose the following transformer core bonding method.

(1) A first core portion comprising a first leg having a first tip portion and a second leg having a second tip portion and forming one of the cores; and a first core portion having a third tip portion. a second core part forming the other of the cores, the second core part having a third leg and a fourth leg having a fourth tip part; The fourth legs of the two core parts are each inserted into the coil and abutted, and the first leg of the first core part and the third leg of the second core part are abutted. ,
In the core bonding method for a transformer, the first and second tip portions of the first core portion and the third and fourth tip portions of the second core portion are butted and bonded, respectively. the first and second tip portions of the core portion of No. 1;
When the third and fourth tips of the second core are butted and joined, one gap is filled with a conductive thermosetting adhesive, and the other gap is filled with a non-conductive adhesive. A spacer and a non-conductive room-temperature curing adhesive are filled, and electricity is applied to the thermosetting adhesive to generate heat through the first and second core parts, and the thermosetting l1 adhesive is A method for bonding a core of a transformer, characterized in that the core is formed by joining the first and second core portions by gradually curing the room temperature curing adhesive after curing the adhesive.

(2) A first core portion forming one of the cores, including a first leg having a first tip portion to the right and a second leg having a second tip portion, and a first core portion having a third tip portion to the right. a second core portion forming the other of the cores by subtracting a third leg having a fourth tip portion and a fourth leg having a fourth tip portion; The legs and the fourth legs of the second core section are respectively inserted into the coil and abutted, and the first legs of the first core section and the third leg of the second core section are inserted into the coil and abutted against each other. the first and second tip portions of the first core portion;
In the L-lance core adhesion method in which the third and fourth tip portions of the second core portion are butted and joined, the first and second tip portions of the first core portion; When the third and fourth tip portions of the second core portion are abutted and joined, a spacer having a conductivity of t is inserted into one of the gaps, and a thermosetting adhesive is filled, and the other is filled with a thermosetting adhesive. A non-conductive spacer and a non-conductive room-temperature curing adhesive are filled in the space between them, and electricity is applied to the spacer through the first and second core portions to generate heat. After curing the adhesive, the room-temperature curing adhesive is gradually cured to join the first and second core portions to form the core. Adhesion method.

(3) A first core portion comprising a first leg having a first tip portion and a second leg having a second tip portion and forming one of the cores; and a first core portion having a third tip portion. a second core part forming the other of the cores, the second core part having a third leg and a fourth leg having a fourth tip part; The fourth legs of the second core section are respectively inserted into the coils and abutted, and the first leg of the first core section of IIQ and the third leg of the second A transformer core bonding method in which the first and second tip portions of the first core portion and the third and fourth tip portions of the second core portion are butted and joined, respectively. In, when the first and second tip portions of the first core portion and the third and fourth tip portions of the second core portion are brought into contact with each other, one of the intervals is inserts a conductive spacer and fills it with a thermosetting adhesive, and fills the other space with a non-conductive room temperature curing adhesive, and at least one of the first and second core parts. After the thermosetting adhesive is cured by applying electricity to generate heat, the room temperature curing adhesive is gradually cured to join the first and second core parts to form the core. A transformer core adhesion method characterized by:

<Example> An example of the transformer core adhesion method of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram for explaining a flyback transformer manufactured using the transformer core bonding method of the present invention.

As shown in the figure, a pair of U-shaped core portions 1 and 11 forming the conductive core each have legs 1a.

1b, 11a, 11b, and the core part 1
The leg 1b of the core portion 11 and the leg 11b of the core portion 11 are inserted into the low voltage coil 4 of the flyback transformer. This low voltage coil 4 is inserted and fixed into a high voltage coil 5 of a flyback transformer.

Therefore, the leg 1b of the core part 1 and the leg 1b of the core part 11
1b is inserted so as to interlink with the low voltage coil 4 and high voltage coil 5 of the flyback transformer.

The tip portion 1a1 of the leg 1a of the core portion 1 and the core portion 11
A thermosetting adhesive 3a is used to join the legs 11a of the legs 11a to the tips 11a1 of the core part 1.
b and the tip 11 of the leg 11b of the core part 11.
For bonding with b1, room temperature curing type) H? Three drugs 3b are used. During this bonding, due to circumstances in the production process, the adhesive 3a is heat-cured.
applied to either a1 or the tip lal
It may be injected into the gap between the tip portion 11a1 and the tip portion 11a1.

Similarly, the room temperature curing adhesive 3b also has a tip portion 1b1.
It may be applied to either the tip portion 11b1 or injected into the gap.

The rectifier circuit 9 used in the above flyback transformer supplies an anode voltage to the cathode ray tube, and the insulating resin 6 such as epoxy resin connects the rectifier circuit 9, the low voltage coil 4, and the high voltage coil 5, respectively. Insulated.

Figure 2 shows the core part 1.11 glued with thermosetting adhesive.
It is a figure showing the state where electricity is supplied to the core consisting of. In this figure, the low-voltage coil 4, high-voltage coil 5, insulating resin 6, rectifier circuit 9, etc. shown in FIG. 1 are omitted, but in reality,
The legs 1b of the core part 1 and the legs 11b of the core part 11 are energized while being inserted therein. Further, the same components as those described above are given the same reference numerals, and the explanation thereof will be omitted.

As shown in the figure, an electrode 7a is attached to the rear end portion 1a2 of the leg 1a of the core portion 1 so as to be wearable. Similarly,
The electrode 7b is attached to the rear end 1 b2 of the llll11b, and the core part 1
The electrode 8a is attached to the rear end 11a2 of the leg 11a of the first leg 11b.
The electrodes 8b are removably attached to the rear end portions 11b2 of the electrodes 8b. And these electrodes 7a, 7b, 8a,
Connect the power supply 10 to 8b. The power supply 10 shown in the figure is
The fL power source may be an AC power source, or a constant current power source instead of a constant voltage power source.

The above-mentioned thermosetting adhesive 3a is a thermosetting silicone rubber adhesive used as an adhesive sealant for electronics, which has almost no electrical conductivity and a volume resistivity of 2×10150 phase, for example, a thermosetting silicone rubber adhesive manufactured by Toshiba Silicon Co., Ltd. It is an adhesive having electrical conductivity with a volume resistivity of 101 to 107 Ω·phase, which is produced by mixing a 34-electrode material, such as carbon, into the electronics adhesive sealant rTsE322-BJ.

On the other hand, the room temperature curing adhesive 3b is a -wave type RTV rubber rK.
E4.0RTVJ (manufactured by Shin-Etsu Chemical) etc. can be used.

In this way, the distal end 1al of the leg 1a of the core section 1 and the distal end 11a1 of the leg 11a of the core section 11 are adhered with the thermosetting adhesive 3a, and the distal end of the leg 1b of the core section 1 is After filling the space between 1b1 and the tip 11b1 of the leg 11b of the core part 11 with room temperature curing adhesive 3b,
Electrodes 7a, 7b.

By applying electricity to 8a and 8b, the thermosetting adhesive 3
a is heated and hardened, and the legs 1a of the core part 1 and the legs 11a of the core part 11 are electrically and mechanically strongly connected, and the core shown in FIG. 1 can be formed.

Therefore, at this time, even before the room temperature curing adhesive 3b hardens, it can withstand the post-manufacturing process and transportation, so the leg 1
Room temperature curing adhesive 3 filled in the space between b and leg 11b
b may be gradually hardened during the process.

As a result, it can be manufactured only by the time required to cure the thermosetting adhesive 3a, and workability is greatly improved.

Furthermore, since current flows only through the leg on the side where the conductive thermosetting adhesive 3a is used, the core can be firmly bonded within a certain period of time regardless of the difference in internal resistance between the two legs.

As described above, when bonding the core, a conductive thermosetting adhesive 3a and a room temperature curing adhesive 3b are used, and the thermosetting adhesive 3a is cured using heat generated by electricity. The method for curing the room-temperature curing adhesive 3b has been described below, but the method described below is for the conductive spacer 2.
a, thermosetting adhesive 3a, and non-conductive spacer 2b
A non-conductive room-temperature curing adhesive 3b is used, and the adhesive is cured by utilizing the heat generated by the 1[characteristic spacer 2a] when energized.

As shown in FIGS. 1 and 2, the spacer 2a having a conductivity of
A spacer 2a is inserted together with a thermosetting adhesive 3a between the distal end portion 11a1 of the core portion 1 and the distal end portion 1b1 of the leg 1b of the core portion 1 and the distal end portion 1b1 of the leg 11b of the core portion 11. A spacer (J 2 b) is inserted between the portion 11b1 and the room temperature curing adhesive 3b.

Then, similar to the case where the core is bonded using only the thermosetting adhesive 3a having 2J conductivity and the room temperature curing adhesive 3b as described in #J, the heat generated by the spacer 2a due to energization is utilized to generate heat. After curing the curable adhesive 3a, the room temperature curable adhesive 3b is cured to form the legs la of the core portion 1.
, 1b and the legs 11a, 11b of the core portion 11 are electrically and mechanically strongly connected, thereby forming the core shown in FIG.

In this case, when the thermosetting adhesive 3a is a conductive thermosetting adhesive, the above-mentioned conductive spacer 2a
Of course, a non-conductive spacer may be used instead.

Furthermore, if this core is a gapless type on one side,
A conductive thermosetting adhesive 3a is used for the leg on the gapless side that does not use a spacer, and a non-1m spacer 2b and a non-3!3 conductive room temperature curing adhesive are used for the leg on the gap side using adhesive 4]. The core may be formed using the adhesive 3b.

In the above-mentioned method, electricity is applied through two pairs of electrodes 7a, 7b, 8a, 8b attached to the core parts 1, 11 to generate heat in the thermosetting adhesive 3a or the base plate 2a. Curing and then gradually curing at room temperature adhesive 3b'4i:
Liii! In Kasaba, it was described that the core part 1.11 was F-1, but using a negative pair of electrodes 7a and 7b, electricity was applied only to the core part 1, and the thermosetting adhesive 3a was applied. It is also possible to generate heat to harden it and to bond the core part 1.11.

That is, if the thermosetting adhesive 3a, the room temperature setting adhesive 3b, and the spacers 2a, 2b are not both on the right side of the conductor T5f9, as shown in FIG. ! A power supply 10 is provided and connected between the electrode 7a and the electrode 7b, and the core part 1 is energized to generate heat. The adhesive 3b is cured and fixed to the core part 11.

The transformer core bonding method of the present invention described above not only accelerates the curing of the adhesive, but also greatly improves the work of adjusting the regulation inductance of the flyback transformer to the standard.

In other words, when attaching the core to the flyback transformer, there are large variations in the magnetic permeability of the core (±20%) and variations in the thickness of the spacer (±5%), so the regulation inductance of the flyback i-lance must be adjusted. <±5%), it is necessary to replace the spacer, etc.
However, in the transformer core bonding method of the present invention, a thermosetting adhesive with IJ conductivity is applied to one bonding surface of the core, and a non-conductive adhesive is applied to the other bonding surface. After applying a room temperature curing adhesive and incorporating it into the flyback transformer, change the gap length of the core with a jig etc. while measuring the -order inductance. When the regulation inductance is within the standard, the core Since electricity is applied to heat and cure the heat-curable adhesive, the heat-curable adhesive can be reliably cured even if there are variations in the internal resistance of the core itself, making it extremely reliable.] - Manufacturing run cores. I can do it.

Furthermore, even if post-processing or transportation is performed before the room-temperature curing adhesive hardens, the joints of the core will not shift, so the curing time can be extremely shortened, greatly improving workability. can do.

Also, as the conductivity of the adhesive and spacer increases, heat generation due to eddy currents of the magnetic flux passing through the adhesive and spacer increases, so it is necessary to set the conductivity of the adhesive and spacer to a value where heat generation due to eddy current does not become a problem. , the generation of eddy currents must be suppressed as much as possible.

Since eddy currents are generated in a plane orthogonal to the magnetic flux, the generation of eddy currents can be prevented if at least one of the following two conditions is satisfied.

■Reducing the quadruplicity in the plane approximately perpendicular to the magnetic flux passing direction.

■Reducing the area of the conductor on a plane substantially perpendicular to the direction of magnetic flux passage.

As an example that satisfies both of these conditions, as shown in FIG. 3(A), the insulator 12 such as a film is arranged so that its longitudinal direction is oriented in the same direction as the magnetic flux direction (in the thickness direction of the spacer 2C).
If a spacer 2C is used in which a linear conductor 13 is mixed, or if a spacer 2d is used in which a spherical conductor 14 having a diameter approximately equal to the thickness of the spacer 2d is mixed in an insulator 12 as shown in FIG. 3(B). The generation of eddy currents can be prevented.

In the embodiment described above, the room temperature curing adhesive 3b is applied between the legs 1b and 11b inserted into the high voltage coil 5.
However, it goes without saying that the thermosetting adhesive 3a may be filled between the legs 1b and the legs 11b, and the room temperature setting adhesive 3b may be filled between the legs 1a and the legs 11a. It goes without saying that various modifications can be made without departing from the spirit of the invention.

(Effects of the Invention) The transformer core bonding method of the present invention heats the thermosetting adhesive used on one joint surface directly or from the vicinity, so the thermosetting adhesive can be effectively and quickly bonded. It can be cured by raising the temperature above.

Since the core is completely bonded by this thermosetting adhesive, post-processing, transportation, etc. can be carried out before the room-temperature curing adhesive used on the other bonding surface is fixed.

Therefore, compared to the first conventional method, the work of loading and unloading the drying oven can be omitted, and the heating and cooling time can be significantly shortened.

Further, the -order inductance can be easily adjusted, and the core bonding process can be carried out online, so that workability is significantly improved.

In addition, core tightening eliminates the need for jigs and drying ovens, making it possible to perform stop-down operations.

Furthermore, the conductive thermosetting adhesive can be used even when there is no gap between the joint surfaces of the first core part and the second core part due to the design. If there is a gap between the joint surfaces of the parts, a normal thermosetting adhesive can be used by using a conductive spacer. Furthermore, by supplying electricity to at least one of the first core portion and the second core portion, the thermosetting adhesive can be cured in a short time regardless of the conductivity of the thermosetting adhesive or the spacer.

In addition, since the thermosetting adhesive was used only on one joint surface, the applied current does not split, the time to complete curing is faster and constant, and the adhesive strength is stable.
This has the effect of being able to provide a transformer core with high reliability in terms of quality.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main parts of a flyback transformer using an embodiment of the transformer core bonding method of the present invention, FIG. 2 is a sectional view of the main parts of the flyback transformer with the coil section omitted, and FIG. A) and (B) are sectional views of a conductive spacer, and FIG. 4 is a sectional view of a main part of a flyback transformer using another embodiment of the present invention. 1... First core part, 11... Second core part, 1a
...first leg, 1b...second leg, 11a...third leg, 11b...fourth leg, 1a1...first tip, 1b1...th 2 tip, 11a1...3rd
Tip part, 11b1...Fourth tip part, 1 a2.1
b2. 11 a2.11 b2... End of core leg, 2a, 2C, 2(j・-) 4-electrode subeki, 2
b...Non-conducting spacer, 3a...Thermosetting adhesive, 3b...Room temperature curing adhesive, 4...Low voltage coil, 5...High voltage coil, 7a,
7b, 8a, 8b-1 pole, 10...power supply, 12...
- Insulator, 13... Linear conductor, 14... Spherical conductor. ψ σ)

Claims (3)

[Claims] (1) A first core portion comprising a first leg having a first tip portion and a second leg having a second tip portion and forming one of the cores; and a first core portion having a third tip portion. and a second core part forming the other of the cores, the second core part having a third leg and a fourth leg having a fourth tip part, and a second core part forming the other of the cores; The fourth legs of the two core parts are each inserted into the coil and abutted, and the first leg of the first core part and the third leg of the second core part are abutted. In the transformer core bonding method, the first and second tip portions of the first core portion and the third and fourth tip portions of the second core portion are butted and bonded, respectively. When the first and second tip portions of the first core portion and the third and fourth tip portions of the second core portion are butted and joined, one of the gaps has conductivity. A thermosetting adhesive is filled, and the other gap is filled with a non-conductive spacer and a non-conductive cold-curing adhesive. The mold adhesive is energized to generate heat, the thermosetting adhesive is cured, and then the room temperature curing adhesive is gradually cured to join the first and second core parts together. A method for bonding a transformer core, the method comprising forming a core. (2) a first core portion comprising a first leg having a first tip portion and a second leg having a second tip portion and forming one of the cores; and a first core portion having a third tip portion. and a second core part forming the other of the cores, the second core part having a third leg and a fourth leg having a fourth tip part, and a second core part forming the other of the cores; The fourth legs of the two core parts are each inserted into the coil and abutted, and the first leg of the first core part and the third leg of the second core part are abutted. In the transformer core bonding method, the first and second tip portions of the first core portion and the third and fourth tip portions of the second core portion are butted and bonded, respectively. When the first and second tip portions of the first core portion and the third and fourth tip portions of the second core portion are butted and joined, one of the gaps has conductivity. A spacer is inserted and a thermosetting adhesive is filled, and the other space is filled with a non-conductive spacer and a non-conductive room-temperature curing adhesive, and the spacer is inserted through the first and second core parts. Then, the spacer is energized to generate heat to cure the thermosetting adhesive, and then the room temperature curing adhesive is gradually cured to join the first and second core parts. A method for bonding a transformer core, comprising forming the core. (3) a first core portion comprising a first leg having a first tip portion and a second leg having a second tip portion and forming one of the cores; and a first core portion having a third tip portion. and a second core part forming the other of the cores, the second core part having a third leg and a fourth leg having a fourth tip part, and a second core part forming the other of the cores; The fourth legs of the two core parts are each inserted into the coil and abutted, and the first leg of the first core part and the third leg of the second core part are abutted. In the transformer core bonding method, the first and second tip portions of the first core portion and the third and fourth tip portions of the second core portion are butted and bonded, respectively. When the first and second tip portions of the first core portion and the third and fourth tip portions of the second core portion are butted and joined, one of the gaps has conductivity. A spacer is inserted and a thermosetting adhesive is filled, the other space is filled with a non-conductive room temperature curing adhesive, and at least one of the first and second core parts is energized to generate heat. , after curing the thermosetting adhesive, gradually curing the room temperature curing adhesive;
and a second core portion to form the core.