JPS6128204B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention applies high frequency high voltage to the primary coil and supplies low voltage from the secondary coil to the work coil. The present invention relates to a transformer that heats a heated object by generating eddy current and hysteresis loss, and is particularly suitable as a device for sealing metal studs to color cathode ray tube panels.

(Prior Art) A known transformer of this type is disclosed in Japanese Patent Publication No. 48-24291. The induction coil has a single turn, and it can be said that the coupling is tighter and more efficient than a multi-turn coil. In addition, it is miniaturized so that it can be placed with sufficient space together with a vacuum holder device for positioning the metal stud in a narrow space on the inner surface of the panel and a moving mechanism for pushing the stud into the glass wall.

However, since the secondary coil is cooled by the cooling medium of the primary coil, it is less effective.
Furthermore, since the secondary coil forms a common conductive path with the primary coil over a portion thereof, an extremely high high frequency voltage is generated in the secondary coil. Since the metal stud is held at zero potential through the holder, the secondary coil and the metal stud are tightly coupled and a high voltage is applied between them, often causing sparks. Sparks create harmful traces on the inner surface of the glass, which is also a problem from a work safety standpoint.

(Problems to be Solved by the Invention) The present inventors have been wondering what kind of configuration should be used to sufficiently cool the secondary coil, and how to prevent sparks by grounding the secondary coil in the same way as a metal stud. Since it is clear that the problem can be solved by changing the voltage to a potential, we have completed the present invention by conducting extensive research into what kind of structure should be used to separate and independently separate the secondary coils and provide a grounded structure.

(Means for Solving the Problems) In order to solve the above-mentioned problems of the prior art, the present invention provides a secondary winding section with a double tube structure of a large diameter and a small diameter, and a base that supports the secondary coil. It is characterized in that it is formed integrally with the winding part, the base is grounded, and the primary coil is inserted into the secondary coil via an insulator.

This completely prevents sparks between the secondary coil and the metal studs, and improves the cooling effect to ensure stable sealing, evenly heating the studs and ensuring high-precision sealing to the panel. This made it possible.

(Example) In Figures 1 and 2, 1 is a secondary coil with a double tube structure that heats with an induced current, and 2 is a secondary coil installed inside the secondary coil 1 via an insulating layer 3. A primary coil that generates an induced current in the coil 1, and a base that is integrally formed with a cylindrical secondary winding portion and support the secondary coil 1, constitute a transformer A. As shown in FIGS. 3 to 5, the secondary coil 1 is an open-loop cylindrical secondary winding part 7 made of conductive metal that is integrally provided with mounting flanges 5 and 6 of predetermined dimensions on the outer periphery of both ends. An open-loop cylindrical secondary winding part 8 made of conductive metal having an inner diameter the same as the outer diameter of the flanges 5 and 6 is placed over and concentrically with a predetermined gap between them, Also, a work coil 1 for holding a metal stud at one end within the opening 9 of the large diameter side secondary winding part 8.
The lower part of the conductive metal inductor block 12 integrally provided with the holding part 11 formed with 0 is fitted, and its arcuate lower surface is fitted onto the upper surface of the small diameter side secondary winding part 7 to be integrally connected. , the open end of the gap is closed at the side surface of the inductor block 12 to form a cooling chamber 13 between the secondary windings 7 and 8. Then, semicircular notches 14 and 14' are provided in a suitable part of one of the flanges 5 of the small-diameter side secondary winding part 7, and cut grooves 15 and 15 are also provided at corresponding positions in the large-diameter side secondary winding part 8. ' are provided to allow communication between the inside and outside, and a supply pipe 16 and a discharge pipe 17 are connected respectively. Holding part 11 of inductor block 12
An insulator 19 such as a Teflon sheet is interposed within the vertically divided portion 18 formed in the vertically divided portion 18 . Reference numerals 20 and 21 are lid members made of an insulating material that close the openings at both ends of the large-diameter side secondary winding section 8, and the shaft 2 has screws carved into both ends.
2, and by tightening this shaft 22, the space between the lids 20 and 21 is reduced and the secondary winding portion 8 is closed. The supply pipe 16, the discharge pipe 17, and the cylindrical tube 25 of the primary coil 2 are passed through one lid member 21 and held therein. As shown in FIG. 6, the primary coil 2 is made by winding a cylindrical tube 25 made of conductive metal in a circular and helical manner so as to match the secondary coil 1, with both ends protruding in parallel in the same direction. Further, an insulating tube 26 such as a Teflon tube is attached to the outer periphery of the cylindrical tube 25 to completely insulate the adjacent winding portions. This primary coil 2 has an end connected to the inductor block 1.
2, so that both ends of the primary coil 2 protrude outward from the lid member 21, and connecting fittings 27 and 28 are attached, respectively. The cap nuts 24 of these connecting fittings 27, 28,
24' to the screws 35 of the fixed side water supply pipe 34 and drainage pipe (not shown) provided with the power supply terminal 33 as shown in FIG.
7 and 28 are connected to the water supply pipe 34 and the drainage pipe. In this way, the cooling medium is circulated within the primary coil 2 and a high frequency voltage is applied via the power supply terminal 33. Similarly, the cap nuts 23 and 23' of the supply pipe 18 and discharge pipe 17 of the secondary coil 1 are connected to other water supply pipes and discharge pipes (not shown) on the fixed side.
Connect to. The base 4 has a bulge 29 in the center along the axial direction, and the upper surface of the bulge 29 is connected to the secondary coil 1.
It is formed into an arc shape that matches the outer diameter of the secondary winding part 8 on the large diameter side, and a fitting groove 30 is provided in the center of the bulge part 29. The projection 31 is fitted into the fitting groove 30 and its lower surface is brought into contact with the bulge 29, and screws or the like are inserted from the lower surface side of the base 4 to integrally connect them. This base 4 is slidably mounted on a separately formed mount (not shown). Since this mounting base is grounded and electrically connected to the chuck device that supports the metal stud, the secondary coil 1 is held at zero potential, and by doing so, the holding portion 11 of the secondary coil 1 is held at zero potential. It is possible to prevent a spark phenomenon between the secondary coil 1 and the metal stud when the metal stud is eccentrically inserted into the work coil 10 of the work coil 10, and work can be performed stably because there is no potential difference.

When a high frequency voltage is applied to both ends of the primary coil 2 of the transformer A, a current flows through the tube 25, forming a magnetic field around the tube 25, causing an induced current in the secondary coil 1 near the inductor block 12. It produces a particularly strong high-frequency induced magnetic field. Therefore, when a metal stud is inserted into the work coil 10 formed in the holding portion 11 of the inductor block 12, an eddy current is generated therein and the stud is heated. By the way, since the primary coil 2 and the secondary coil 1 also generate heat to high temperatures due to their own eddy current loss, the coils need to be cooled. This is because when the coil generates heat, it oxidizes or deforms, reducing the sealing accuracy of the stud. The primary coil 2 can be configured by circulating a cooling medium (for example, water) in the tube 25, but since the secondary coil 1 is a flat plate formed into a cylindrical shape, the cooling structure is different from that of the primary coil 2. A cooling chamber 13 with a double pipe structure was adopted. A supply pipe 16 and a discharge pipe 17 are connected to the cooling chamber 13, and a cooling medium is supplied from the supply pipe 16, circulated, and discharged from the discharge pipe 17. In addition, the holding portion 1 of the inductor block 12
1 has a high cooling effect on the secondary coil 1, and the amount of heat generated in this part is small, so there is no need to particularly cool it.

In order to seal a metal stud to the inner surface of the panel using the transformer A, attach an arbitrary chuck device that supports the metal stud to the end face of the holding part 11 of the inductor block 12, and attach one of the connecting fittings of the primary coil 2. 27 is connected to a cooling medium supply source, the other connecting fitting 28 is connected to a discharge tank, the supply pipe 16 of the secondary coil 1 is connected to the supply source, and the discharge pipe 17 is connected to the discharge tank. Then, the metal stud is fixedly held in the work coil 10 of the holding part 11, and its tip is made to protrude toward the secondary winding part 8 side,
Only the holding part 11 and the chuck device C are inserted into the inner surface of the panel, and with the tip of the metal stud approaching the inner surface of the panel, a high frequency voltage is applied to both ends of the primary coil 2 to generate an induced current in the secondary coil 1. The heated metal stud is brought into contact with the sealed part of the Panelo, the heat of the metal stud melts the sealed part of the Panelo, and the transformer A is moved to place the metal stud into the Panelo. The metal stud is penetrated by a predetermined distance into the interior of the panel, the voltage applied to the primary coil 2 is released, heating of the metal stud is stopped, and the metal stud is welded and fixed inside the panel, and then removed from the chuck device to complete the work. In this case, three or four transformers may be used and sealed at three or four predetermined locations on the panel at the same time.

During the above-mentioned sealing process, since the secondary coil 1 has a single turn, unlike a multi-turn coil that is loosely coupled, the magnetic flux density is uniform, and the metal studs placed within the magnetic field are uniformly distributed over the entire surface. Since heating is performed, stable sealing work can be performed and work time can be shortened. Furthermore, a very high voltage acts on the primary coil 2 and the secondary coil 1, and a considerable potential difference occurs between them, but the insulation between the primary coil 2 and the primary coil 2 and the secondary coil 1 are completely applied, there is no short circuit between them, and there is no discharge between the primary coil 2 and the secondary coil 1, so that stable operation can be performed. Furthermore, the primary coil 2 and the secondary coil 1 are completely separated, and only the current induced by the primary coil 2 flows through the secondary coil 1. Furthermore, the secondary coil 1 is grounded via the base 4, and is at zero potential. Even if it is exposed to the outside, workers will not suffer accidents such as electric shock, and it is safe and does not require any special cover. In addition, the primary coil 2 and the secondary coil 1 are each cooled independently, and in particular, the secondary coil 1 has a double tube structure by combining two secondary winding parts 7 and 8 with different diameters, so that both A cooling chamber 13 is formed around the entire circumference between the primary coil 2 and the primary coil 2.
Both the secondary coil 1 and the secondary coil 1 have a high cooling effect, preventing deterioration of work accuracy due to heat generated by these coils, allowing continuous work, and improving work efficiency. In addition, since both the primary coil 2 and the secondary coil 1 are formed into a cylindrical shape, manufacturing and assembly are easy, and since the primary coil 2 and the secondary coil 1 are each independent, there is no need to worry about which parts. Even if it is damaged, it can be easily repaired.

As explained above, the present invention has a small diameter open loop cylindrical secondary winding part concentrically disposed within a large diameter open loop cylindrical secondary winding part, and a predetermined gap is provided around the entire circumference between the two. A single-turn secondary coil in which the openings at both ends of the secondary winding section with a double tube structure are closed with a lid member, and the opening on the top surface is closed with an inductor block having an insertion hole that holds a metal stud at one end. a primary coil formed by spirally winding a conductive metal tube whose outer periphery is covered with an insulating tube, with both ends facing in the same direction in parallel; and a base supporting the secondary coil. The secondary coil is grounded, the primary coil is inserted into the secondary coil via an insulator, both ends of the primary coil are made to protrude from one lid member, and the gap and the outside are connected to both sides of the secondary winding part. A pipe is provided to communicate with the primary coil, and a current is applied to both ends of the primary coil, and a cooling medium is circulated within the pipe and within the gap between the secondary coils.

(Effect of the invention) The primary coil and the secondary coil are each configured independently, and the insulation between them is completely provided,
Work can be performed safely without the risk of sparks or electric shock during work. Furthermore, since both the primary coil and the secondary coil are individually cooled, the cooling effect is high, the work accuracy is improved, continuous work can be performed, and work efficiency is improved. Furthermore, the structure is simple, and manufacturing, assembly, and repair can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a side view of a transformer according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a sectional view taken along the line of FIG.
Figure 4 is a sectional view taken along the line shown in Figure 2, Figure 5 is a front view with one lid member removed, Figure 6 is a side view showing the structure of the primary coil, and Figure 7 is the terminal of the primary coil. This is an example of a connection structure. 1... Secondary coil, 2... Primary coil, 4...
Base, 7... Small diameter side secondary winding part, 8... Large diameter side secondary winding part, 12... Inductor block, 20, 21...
...Lid member, 25...Cylindrical tube, 26...Insulating tube.

Claims (1)

[Claims] 1. A double-layer winding system in which an open-loop, small-diameter cylindrical secondary winding part is concentrically arranged within an open-loop, large-diameter cylindrical secondary winding part, with a predetermined gap provided around the entire circumference between the two. A single-turn secondary coil that has a tube structure and is closed with an inductor block that has an insertion hole that holds a metal stud at one end of the opening on the upper surface of the secondary winding part, and a conductive metal whose outer periphery is covered with an insulating tube. A primary coil made of a spirally wound tube with both ends facing in the same direction in parallel, and a base that supports the secondary coil are integrally formed in a cylindrical secondary winding part. The base is grounded, the primary coil is inserted into the secondary coil through an insulator, both ends of the primary coil protrude from one side, and two pipes are installed to pass the cooling medium through the gap between the secondary windings. A high frequency induction heating transformer, characterized in that a high frequency voltage is applied to both ends of the primary coil and a cooling medium is circulated within the tube and within the gap between the secondary coils.