MXPA97010128A - Heater, type bar, high frequency - Google Patents

Abstract

The present invention relates to a high frequency flexible rod heater, comprising: a heat resistant and insulated flexible tube having its opposite ends closed and sealed such that it can form an impermeable container; a flexible conductive coil extending therein; heat-resistant and insulated tube, said flexible conductor coil having an inner side inside said heat-resistant and insulated flexible tube, a magnetic core having a longitudinal direction and which is disposed on the inner side of said flexible conductor coil, said core being segmented in the longitudinal direction such that it may comprise a plurality of parts of the magnetic core, and a flexible tube of cold water extended in said heat-resistant tube and insulated for the purpose of cooling the interior of said heat-resistant and insulated tube; said high frequency bar heater is flexible as a to

Description

HEATER, BAR TYPE, HIGH FREQUENCY BACKGROUND OF THE INVENTION: Field of the Invention: The present invention relates to a high frequency bar-type heater inserted in a thin hole drilled along the central axis of an object to be heated, for example a bolt of clamping, etc. to heat this object by means of a high frequency electromagnetic induction.

Description of the Prior Art: Figure 1 shows a high frequency bar-type heater of the prior art. As shown in Fig. 3 (A), the high-frequency bar-type heater of the prior art 01 consists of an insulated and heat-resistant tube 02 made of glass fiber or ceramics. a coil in the form of a hair pin 03 of a turn, inserted therein, made of a copper tube and a high permeability magnetic core disposed in the conductor coil 03. This heater, rod type, of high frequency 01 is inserted in a hole 9h of an object to be heated 9, which is made of a material having a conductivity, such as steel, etc., and a strong high-frequency electric current is provided to the conducting coil 03, then a parasitic current occurs it alternates around the object to be heated 9 by electromagnetic induction and the object to be heated 9 is heated exothermically and its temperature is raised by a heat Joule of a parasitic current. The cold water for cooling the conductive coil 03, made of a copper tube, causes a flow therein, in such a way that current flow and magnetic generation are facilitated with the result that the electromagnetic induction is improved. In this prior art high frequency bar-type heater, like none of the heat-resistant and insulated tubes, the conductive coil and the magnetic core have flexibility due to their material, structure, configuration, etc., the heater itself completely lacks flexibility. Therefore, as shown in Figure 3 (B), if there is an obstruction 10 above the hole 9h of the object to be heated 9 into which the heater, bar-type, high-frequency 01 is to be inserted, The problem arises that the high-frequency rod-type heater 01 can not be inserted in the hole 9h of the object to be heated 9.

SUMMARY OF THE INVENTION: In order to solve the problem in the prior art, it is an object of the present invention to provide a high frequency bar-type heater that is flexible enough to be inserted in a hole of a leaving object. to heat, even if there is an obstruction on top of the object to be heated, in which the heater, bar type, of high frequency is inserted. (1) The bar-type, high-frequency heater according to the present invention is characterized in that it comprises a thin heat-resistant and insulated tube having both closing ends in such a way as to form a water-proof container, a flexible and thin conductive coil is disposed inserted in the heat-resistant and insulated tube; the magnetic core, sectioned in several parts in its longitudinal direction, contained on an internal side of the conductive coil; and a flexible tube for cold water disposed in an inserted manner in the heat-resistant tube and insulated so as to cool the interior thereof, therefore the bar-type, high-frequency heater is completely flexible. In the bar-type, high-frequency heater according to the present invention, the entire heat-resistant and insulated tube, the conductive coil and the cold water tube have flexibility and a magnetic core, sectioned into various pieces in their longitudinal direction , contained therein, with the result that the heater, bar type, high frequency has total flexibility, even if there is an obstruction above the hole of the object to be heated and in which the heater is inserted, the heater bends flexibly and can be easily inserted into the hole. (2) The high-frequency bar-type heater mentioned above (2) is also characterized in that the core, contained on the inner side of the conductive coil, is made of a flexible material instead of being sectioned into a diversity of pieces in its longitudinal direction. In the bar-type, high-frequency heater according to the present invention, the magnetic core is also made of a flexible material, whereby the heater becomes more flexible in its entirety than that mentioned in point (1) above and can be inserted more easily in the hole of the object to be heated.

BRIEF DESCRIPTION OF THE DRAWINGS: Figure 1 is an explanation view of a bar-type, high-frequency heater of an embodiment according to the present invention, wherein Figure (A) is a cross-sectional view in FIG. perspective and figure 1 (B) is an explanation view of a stage of the insertion entering and exiting a hole of an object to be heated. Figure 2 is an explanation view of another embodiment of a bar-type, high-frequency heater according to the present invention. Figure 3 is an explanation view of the high-frequency bar-type heater of the prior art, wherein Figure 3 (A) is a perspective cross-sectional view and Figure 3 (B) is a view that explains that the insertion in a hole of an object that is going to be heated is possible, even though there is an obstruction in the hole. Figure 4 is a cross-sectional view of an example of the bar-type, high-frequency heater according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT: The high-frequency bar-type heater of one embodiment according to the present invention is described with reference to figure 1. In figure 1, the numeral 2a designates a resistant tube heat-insulated and made of a material of heat-resistant nature and electrically insulated and low-stiffness, such as polytetrafluoroethylene plastics, and 2b designates an insulated jacket, consisting of a glass ribbon (fiberglass molds in the form of tape) etc., attached to the outer surface of the heat-resistant and insulated tube 2a. Numeral 2 designates an insulated and insulated heat resistant tube having a heat-resistant and insulated tube 2a which is encamised with an insulated jacket 2b, this insulated and insulated heat-resistant tube 2 which is formed in a flexible container, tested and thin tube-shaped water with a predetermined diameter and length such that it is inserted into a hole 9h to heat the selected object to be heater 9 and with its two closing ends sealed. Numeral 3 designates a conductive coil formed in a coil, in the form of a one-turn hair pin, by a flexible conductor, such as a radiofrequency cable in which thin insulated copper wires are twisted together, etc. , and numeral 4 designates a pair of terminals of a conductive coil 3. Numeral 5 designates a magnetic core, made of a soft magnetic material of high permeability, such as for example Sendust etc., formed with a plurality of magnetic core units short, in the form of columns aligned in axial direction.

Numeral 6 designates a flexible cold water pipe, made of plastic, such as polytetrafluoroethylene, etc., arranged in such a way that the inlet of the cold water supply 7 is placed in a lower portion of the insulated jacket and insulated pipe 2. Incidentally, an outlet of cold water 8 is provided in the upper end portion of a jacket resistant to encapsulated and insulated 2. Then, a form of use, etc., is described with respect to the heater, bar type, high frequency 1. shown in Figure 1. The heater, rod type, high frequency 1 is inserted into a hole 9h, which is very thin, for example, the internal diameter is 20 mm and the length is 1 m, drilled to along the central axis of the object to be heated 9, such as for example a fastening pin., for heating the object to be heated 9 by means of an electromagnetic frequency induction. After the conductive coil 3 is supplied with a wide high frequency electric current from an electrical source (not shown), a parasitic current arises from the electromagnetic induction within the object to be heated 9, around the hole 9h, this parasitic current flows in the object to be heated 9 and generates a Joule heat thanks to the electrical resistance of the object to be heated 9.

In this embodiment, the object to be heated raises the exothermic temperature, in itself, so there is no need to provide a heater, bar type, high frequency at a high temperature, the object that is going to heating can raise its temperature quickly. It should be noted that the frequency of the electric current can be decided according to the conditions of the thickness of the heating (depth), etc. When an electric current is provided to the conductive coil 3, if the frequency is too high, it is caused that the electric current flows only on the conductor surface of the conductive coil 3 (skin effect). Thus, the radiofrequency cable conductor, in which thin insulated copper wires are screwed, etc., is used to increase the resistance of the conductor coil 2, which was mentioned above, because the effect can be avoided skin and you can ensure flexibility. Furthermore, as regards the magnetic core 5 made of a soft magnetic material of high permeability, if not used, a large amount of electromagnetic flux could not pass between two wires of the conductor coil 3 inside the heater, bar type, of high frequency 1, and it would only be possible to pass a small amount of magnetic flux inside the object to be heated 9 and only a small amount of induction current is generated in the object to be heated 9. However, by interposing a high permeability magnetic core 5 between the two wires of the conductive coil 3, a large amount of magnetic flux is passed between them and a high induction current can be generated in the object to be heated 9. Furthermore, when provides the conductive coil 3 with an electric current, the heater, type bar, high frequency 1 itself, raises its temperature by the exothermicity of the coil conduc 3, and the magnetic core 5, and by the radiation of the heat from the object to be heated 9, etc., therefore a quantity of cold water is provided which is provided by a cooling device with water (not shown) through the inlet for the cold water 7 and the cold water pipe 6 in the lower portion of the heater, bar-type, high frequency 1 and then the already hot water is discharged from the cold water outlet 8, of This method avoids the increase in the temperature of the heater, bar-type, of high frequency 1. As regards the cooling method, which is mentioned with respect to the prior art, it could be used instead of the cooling method that It was mentioned above. However, in the high-frequency bar-type heater 1 of the present embodiment, as the insulated and insulated heat-resistant tube 2 consists of flexible materials that do not have much strength, it is desirable that the heat-resistant tubing be jacketed and isolated 2 that is waterproof, fill with cold water so that it is cooled directly thanks to the water that is in contact with it. It is important to note that the insulating jacket 2b is provided primarily to prevent the heat-resistant and insulated tube 2a from being heated to a high temperature by the heat radiating from the object to be heated 9. The flexible conductor coil mentioned above 3 and the magnetic core 5 is immersed in cold water so that they come into direct contact with the water to obtain a better cooling effect. Generally, the water has a very high electrical resistance and there is no specific problem for being in contact with the cold water, but if you can consider the reduction of its electrical resistance due to the water quality, an insulator will be applied on the surfaces of the conductive coil 3 and the magnetic core 5. In the heater, bar-type, high-frequency 1, the heat-resistant and insulated tube 2, in the conductive coil 3 and the cold-water pipe 6 are flexible and the magnetic core 5 cuts into various pieces in its longitudinal direction, therefore the heater, rod type, high frequency 1 has total flexibility. Thus, and in accordance with what is shown in Figure 1 (B), even if there is an obstruction 10 above the hole 9h of the object to be heated 9, the heater, bar-type, of high frequency 1 can be bent and inserted for, through the hole 9h, heating the selected object to be heated 9 and then removed through it. It is important to note that while the conductive coil 3 is made as a serpentine in the form of a one-turn hair pin, according to FIG. 1, it can be formed in two or more turns in a solenoid coil. Also, for the magnetic core 5, different kinds of ferrous or amorphous magnetic materials that do not have the properties of magnetic anisotropy of the crystal, the ability to have a low magnetic force, high permeability, high magnetic flux density, high electrical resistivity, etc. In addition, for the heat-resistant and insulated tube 2 and the cold water tube 6, materials such as silicone rubber or fluoro rubber can be used. A high-frequency bar-type heater according to another embodiment of the present invention is described in FIG. The high-frequency bar-type heater 1, according to the embodiment shown in Fig. 2, is provided with a flexible magnetic core 15, made of a rubber, plastic, etc. material having particles magnetic particles blended therein, formed in one unit in the longitudinal direction, instead of a magnetic core 5 sectioned into various pieces in the longitudinal direction of the first embodiment. In this embodiment, since the magnetic core 15 is formed of a flexible material, a more flexible, high-frequency bar-type heater can be made as compared to that of the aforementioned first embodiment and which is inserted more easily in the hole 9h of the object to be heated 9. It is also possible for the magnetic core 15 to be cut into various pieces, if necessary, and to isolate its surface. It should be noted that while the cross-sectional shapes of the conductive coil 3 and the magnetic core 5, 15 shown in FIGS. 1 and 2 are substantially circular, any cross-sectional shape can be employed in accordance with the shapes of the hole of the object to be heated. In Figure 4, an example is shown in which the cross section of the conductor coil in the form of a half moon, that of the magnetic core is rectangular and the cold water tube 6 is provided in the central portion of the magnetic core.

Since the bar-type, high-frequency heater of the present invention is formed by a heat-insulated and insulated tube, a conductive coil and a cold water tube, all made of flexible materials, and has the core sectioned in a variety of pieces in the longitudinal direction, has a sufficient flexibility in its entirety. Thus, if there is an obstruction in the hole of the object to be heated, the bar-type, high-frequency heater can be bent and inserted through the hole to heat the selected object and then removed from it. Also, the magnetic core is formed of a flexible material and the high-frequency bar-type heater becomes more flexible and its insertion into the hole of the object to be heated is made easier. While the preferred embodiment of the present invention is described, variations thereof may occur to those skilled in the art, without departing from the scope of the concepts of the present invention, which are specified in the following claims.

Claims (2)

1. A high-frequency bar-type heater that is inserted into a thin hole to heat an object around the hole, characterized in that the high-frequency bar-type heater comprises a thin flexible tube, heat-resistant and insulated which has its two ends closed to, in this way, form a waterproof container; a thin and flexible conductive coil disposed, inserted in the heat-resistant and insulated tube; a magnetic core, sectioned into a plurality of pieces in its longitudinal direction, contained on an inner side of the conductive coil; and a flexible cold water tube disposed in an inserted manner in the heat resistant tube and insulated so as to cool the interior thereof, therefore the high frequency bar type heater has total flexibility. The heater, bar-type, high-frequency according to claim 1, characterized in that the magnetic core contained on the inner side of the conductive coil is formed of a flexible material instead of being sectioned into a plurality of pieces in its longitudinal direction.