JP2008210972A - Transformer for high-frequency induction heating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance a cooling efficiency of a transformer for high-frequency induction heating by omnidirectionally absorbing a generated heat of a core with a primary winding wound, downsizing the transformer. <P>SOLUTION: The transformer 1 for the high-frequency induction heating is manufacturered by winding the multi-winding conductor (the primary winding 4) around a hollow core 2, encapsulating the primary winding 4 annularly formed by the winding of the multi-winding conductor (the primary winding 4) at the both end sides of the core 2 in a secondary winding 6 with a single-winding conductor formed in an annular hollow shape, providing inflow ports for a cooling water (a tube 3 for the cooling water, a hole 65a for the cooling water) to a secondary winding 6 in order to flow the cooling water for immersing the primary winding 4 and the core 2 into the secondary winding 6, and providing an outflow port for the cooling water in the secondary winding 6 (a tube 5 for the cooling water, a port 67a for the cooling water) to the secondary winding 6 so as to face to the inflow port for the cooling water (the tube 3 for the cooling water, the hole 65a for the cooling water). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high frequency induction heating transformer that is reduced in size by increasing the cooling efficiency of heat generation of a primary winding and a core by energizing the primary winding.

  A conventional high frequency transformer will be described with reference to FIG. As shown in FIG. 6, a ring-shaped cooling water pipe 124 is disposed concentrically in contact with the outer periphery of a cylindrical ring core 123, and an insulating tape 125 is wound around the ring core 123 and the cooling water pipe 124. A secondary winding 122 is wound around the ring core 123 and the cooling water pipe 124 via an insulating tape 125. The secondary winding 122 is wound in one row. An insulating tape 125 is wound around the outer periphery of the secondary winding 122, and a primary winding 121 is wound around the secondary winding 122 via the insulating tape 125. The primary winding 121 is wound in one row.

A voltage is applied to the primary winding 121 from a power source via a primary terminal bolt (not shown), and the voltage generated in the secondary winding 122 is supplied to a load via a secondary terminal bolt (not shown). Further, the cooling water flows through the cooling water nipple 127. Since the cooling water pipe 124 is disposed in contact with the ring core 123 and the windings 121 and 122 are wound around the ring core 123 and the cooling water pipe 124, the ring core 123 and the windings 121 and 122 can be linearly cooled by the cooling water pipe 124 (Patent Document). 1).
JP-A-8-148346 (paragraph 0023 to paragraph 0025, paragraph 0027, paragraph 0030 FIG. 5)

  However, as shown in FIG. 6, the cooling water pipe 124 is disposed adjacent to the ring core 123, the cooling water is passed through the cooling water pipe 124, and heat is indirectly absorbed from the ring core 123. Therefore, only the heat of the portion of the ring core 123 adjacent to the cooling water pipe 124 is cooled, and if the entire ring core 123 alone is to be cooled, the cooling water pipe 124 becomes large, leading to an increase in size of the high frequency transformer. Further, since the cooling water pipe 124 is disposed between the ring core 123 and the primary winding 121, the magnetic coupling between the primary winding 121 and the ring core 123 is deteriorated.

  The present invention has been made in view of the above circumstances, and can absorb heat generated from the core wound with the primary winding from all directions, reduce the temperature rise of the core, and efficiently transmit power. An object of the present invention is to provide a small-sized high frequency induction heating transformer.

  In order to achieve the above object, according to the first aspect of the present invention, by winding a multi-winding conductor around a hollow core, the multi-winding conductor is wound around both ends of the core. In a high frequency induction heating transformer in which a primary winding having an annular shape is enclosed in a secondary winding formed by forming a single winding conductor in a hollow annular shape, the secondary winding includes the primary winding. And a cooling water inlet provided to flow cooling water for immersing the core into the secondary winding, and the cooling water in the secondary winding so as to face the cooling water inlet. And a cooling water outlet provided in the secondary winding in order to flow out.

  Therefore, according to the first aspect of the present invention, the cooling water inlet and the cooling water outlet are provided in the secondary winding so that the cooling water flows into the secondary winding and the primary winding in the secondary winding. By immersing the wire and the core, it is possible to cool the primary winding, the secondary winding and the core from all directions, and the cooling water used for cooling the primary winding, the secondary winding and the core is the cooling water flow. Since the outlet is provided so as to face the cooling water outlet, it can easily flow out of the secondary winding.

  In addition to the configuration described in claim 1, the invention described in claim 2 includes at least a pair of the cooling water inlet and the cooling water outlet provided on the end side of the secondary winding. The secondary winding is located along a diagonal line in the longitudinal direction of the secondary winding.

  Therefore, according to the second aspect of the present invention, the cooling water inlet and the cooling water outlet provided on the annular lid on the end side of the secondary winding are diagonal in the longitudinal direction of the secondary winding. Since it is provided in the upper position, the cooling water from the cooling water inlet to the cooling water outlet is likely to cause turbulence, and the cooling water can be easily distributed in the secondary winding.

  Furthermore, the invention according to claim 3 is provided at the position along the diagonal line in the longitudinal direction of the secondary winding on the end side of the secondary winding in addition to the configuration according to claim 2. The cooling water from the cooling water inlet flows in an oblique direction with respect to the primary winding and the core, and is closer to the end of the secondary winding than the oblique direction with respect to the primary winding and the core. And flowing out from the cooling water outlet provided at a position along the diagonal in the longitudinal direction of the secondary winding.

  Therefore, according to the third aspect of the present invention, the cooling water from the cooling water inlet flows into the primary winding and the core from an oblique direction to cause a turbulent flow of the cooling water. Other than the primary winding and the core part, the cooling water is also applied, and even if the flow direction of the cooling water is one direction, the primary winding and the entire core can be easily immersed, so that Allow cooling.

  According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the core includes a plurality of ring-shaped cores coupled to each of the coupled ring-shaped cores. Is provided with a coating for insulation and waterproofing, and each ring-shaped core is characterized in that its axial thickness is shorter than its outer diameter.

  Therefore, according to the invention described in claim 4, since the core is immersed in the cooling water in the secondary winding, the core can be waterproofed by applying a waterproof coating, and the primary winding is also Since it is covered with an insulator, it can be waterproofed. Furthermore, by equalizing the outer diameter and axial thickness of each ring-shaped core, it is possible to prevent cooling of only the surface of the ring-shaped core and to evenly cool the entire ring-shaped core. become. In addition, each ring-shaped core can be made uniform in heat inside the ring-shaped core by reducing the axial thickness compared to the outer diameter.

  According to the present invention, since the heat from the core (ring-shaped core) is absorbed from all directions, the heat release from the core (ring-shaped core) is improved, and the temperature of the core (ring-shaped core) is increased. Can be suppressed, and the amount of electric power to be transmitted can be increased. In addition, a cooling water pipe for cooling the core (ring-shaped core) becomes unnecessary, and the multi-turn winding (primary winding) is also cooled, so that the multi-turn winding (primary winding) is cooled. The cooling water pipe is not necessary, and the entire transformer can be downsized. Furthermore, since a cooling water pipe or the like for cooling the core (ring-shaped core) is unnecessary, the magnetic coupling between the core and the multi-turn winding (primary winding) is improved. And it becomes possible to directly connect the core (ring-shaped core) and the multi-turn winding (primary winding), and the core (ring-shaped core) and the multi-turn winding (primary winding). And can be connected without breaking. Moreover, since the core is coated, the generation of rust can be suppressed even when ferrite, a silicon steel plate, or amorphous is used as the core material.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows a high-frequency induction heating transformer 1 according to the present invention. The high frequency induction heating transformer 1 according to the present invention basically has a cylindrical shape as shown in FIGS. The secondary winding 6 of the high-frequency induction heating transformer 1 is formed of a circular container body 61 and annular lid bodies 62 and 66 in which a single winding conductor is formed in a hollow ring shape. The annular container body 61 has a length that can accommodate the primary winding 4, and the annular lid body 66 of the annular container body 61 has cooling that leads to the annular container body 61 as shown in FIGS. 1 and 2. As shown in FIGS. 1 and 2, cooling water holes 65a and 67a communicating with the annular container body 61 are provided on the annular lid body 62 side. .

  A through hole 64 is provided in the central portion of the annular lid 62 in the annular lid 62 that faces the annular lid 66. A conduit portion 63 of the secondary winding 6 extending from the center of the annular lid 66 extends through the through hole 64 of the annular lid 62. As shown in FIGS. 1 and 2, an output terminal electrode 65 of the secondary winding 6 is formed at the end of the extended conduit portion 63. As shown in FIG. 4, the output terminal electrode 65 is provided with a cooling water hole 65 a (cooling water inlet) so that the cooling water can flow through the conduit 63. The cooling water flowing in from the cooling water hole 65a and flowing into the conduit 63 is cooled by the cooling water pipe 5 (cooling water) provided in the annular lid 66 facing the cooling water hole 65a (cooling water inlet). The water flows out from the water outlet.

  Further, in order to fill the gap between the conduit portion 63 and the through hole 64 and ensure water tightness, an annular ring is formed between the conduit portion 63 and the through hole 64 as shown in FIGS. A packing 68 is incorporated. And as shown in FIG.1 and FIG.4, the output terminal electrode 67 is provided so that this conduit | pipe part 63 may be adjoined. As shown in FIG. 1, the output terminal electrode 67 is formed so as to protrude from the annular lid 62 so as to be aligned with the output terminal 65. An insulating material 69 is incorporated between the output terminal electrode 65 and the output terminal electrode 67 to ensure insulation (see FIG. 4). Similarly to the output terminal electrode 65, the output terminal electrode 67 is also provided with a cooling water hole 67a (cooling water outlet) as shown in FIGS. 1 and 4, and the cooling water hole 67a (cooling). The water outlet) communicates with the annular container body 61.

  This cooling water hole 67a (cooling water outlet) flows in from the cooling water pipe part 3 (cooling water inlet) provided in the annular lid 66 opposite to the cooling water hole 67a (cooling water inlet). The cooling water will flow out. As shown in FIG. 1, the cooling water pipe 3 (cooling water inlet) and the cooling water hole 67a (cooling water outlet) are on the end side of the secondary winding 6 (the annular lid 62). 66), the cooling water flowing in from the cooling water pipe section 3 (cooling water inlet) is introduced into the secondary winding 6 because the cooling water is provided at a position along the longitudinal diagonal of the secondary winding 6. This makes it easier to spread the primary winding 4 and the core 2 in the secondary winding 6.

  As shown in FIG. 1, the primary winding 4 enclosed in the secondary winding 6 is configured by winding the primary winding 4, which is a multi-winding conductor, around the core 2. Specifically, as shown in FIG. 1, the primary winding 4 is wound around the core 2 and formed in an annular shape in which the ends of the primary winding 4 are close to each other and enclosed in the secondary winding 6. . As shown in FIG. 2, one end 42 and the other end 43 of the primary winding 4 of the primary winding 4 are drawn out of the annular lid 66 on the side opposite to the opening end 63 of the annular container 61. It is incorporated in the parts 66a and 66a and is connected to the input terminals 7 and 8 attached to the lead parts 66a and 66a.

  The core 2 connects a plurality of ring-shaped cores 21, and each of the connected ring-shaped cores 21 is coated for insulation and waterproofing. Then, the axial thickness of each of the connected ring-shaped cores 21 is made smaller than the outer diameter. Specifically, the thickness of each of the connected ring-shaped cores 21 is made thinner. It is also possible to equalize the heat inside the ring-shaped core 21 by increasing the surface area. In this example, since the surface of the core 2 is coated, any material of ferrite, silicon steel plate, or amorphous can be used as the material of the core 2.

  The primary winding (primary conductor) 4 and the secondary winding (secondary conductor) 6 are insulated from each other by a fluororesin that is a covering of the primary winding 4 and cooling water. The input terminals 7 and 8 are insulated from the annular lid 66 by an insulating material (not shown).

  Next, the operation of the high frequency induction heating transformer 1 according to the present invention will be described.

  First, as shown in FIG. 5, the cooling water flows into the secondary winding 6 from the cooling water inlet (cooling water conduit 3) of the bottom plate portion 66 of the annular container body 61 in the direction of the arrow A, and As shown in FIG. 5, cooling water flows into the secondary winding 6 from the direction of arrow B from the cooling water inlet (cooling water hole 65 a) of the output terminal plate 65 of the lid 62. Thereafter, the input terminals 7 and 8 of the high frequency induction heating transformer 1 are connected to an AC power source, and the primary current is passed through the primary winding 4. The magnetic flux Φ due to the primary current circulates in a closed loop. On the other hand, since the secondary winding 6 has a hollow annular shape surrounding the closed loop, the magnetic flux Φ is linked to the secondary winding 6 over the entire length of the closed loop, and as a result, the secondary voltage corresponding to the number of linkages is obtained. Occurs in the secondary winding 6, and a voltage transformed between the output terminal electrodes 65 and 67 at a turn ratio appears.

  At this time, if the primary current is continuously supplied from the AC power source to the input terminals 7 and 8 of the high frequency induction heating transformer 1, heat is generated in the primary winding 4 and the core 2. Cooling water from the cooling water inlet (cooling water conduit 3) flows into the secondary winding 6 and heads toward the cooling water outlet (cooling water hole 67a), and the primary winding 4 and the core. 2 is filled in the secondary winding 6 so that the cooling water from the cooling water inlet (cooling water hole 65a) flows into the conduit 63 and the cooling water outlet (cooling water pipe). Head to Road 5).

  Specifically, as shown in FIGS. 3 and 5, the cooling water flowing in from the cooling water pipe 3 along the direction of the arrow A flows in an annular shape, and in the secondary winding 6, the annular lid Start to fill cooling water from 66 side. When the cooling water continues to flow in the direction of arrow A from the cooling water pipe portion 3, the cooling water filled from the annular lid body 66 side is filled toward the annular lid portion 62. When the cooling water reaches the annular lid 62, the cooling water flows out from the cooling water hole 67b as shown in FIGS. Thus, since the flow of the cooling water is along the diagonal line in the secondary winding 6 that is the direction of the arrow E, the cooling water flowing in the direction of the arrow E results in the flow toward the cooling water hole 67b. It becomes the same as having produced a turbulent flow.

  That is, the cooling water from the cooling water pipe portion 3 flows in an oblique direction (arrow E direction) to the primary winding 4 and the core 2 while generating a turbulent flow. And the inflowing cooling water goes to the hole 67a for cooling water from the diagonal direction (arrow E direction) with respect to the primary winding 4 and the core 2. FIG. Further, the cooling water from the cooling water hole 65a flows along the conduit portion 63 of the secondary winding 6 and cools the secondary winding 6 from the center of the secondary winding 6, while the cooling water pipe Head to part 5.

  In this way, the cooling water reaches every corner in the secondary winding 6. As a result, the secondary winding 6 is cooled and the primary winding 4 and the core 2 immersed in the cooling water absorb heat from all directions by the cooling water. Thus, when the primary winding 4 and the core 2 are immersed in the cooling water, not only the surface of the primary winding 4 and the core 2 but also the primary winding 4 and the entire core 2 are uniformly cooled. Therefore, in particular, heat from the core 2 is easily released, and temperature rises of the primary winding 4 and the core 2 are suppressed. As a result, a large current can be passed through the primary winding 4, and a large capacity and small high frequency induction heating transformer 1 can be realized.

  And the cooling water which flowed in from the cooling water pipe line 3 from the direction of arrow A and flowed in the secondary winding 6 in the direction of arrow E flows out from the cooling water hole 67b along the direction of arrow C. Further, the cooling water that has flowed in from the cooling water hole 65b from the direction of arrow B flows along the conduit portion 63 and flows out of the cooling water pipe portion 5 along the direction of arrow D.

It is explanatory drawing which shows the inside of the side surface direction of the high frequency induction heating transformer which is this invention. It is explanatory drawing which shows the inside of the front direction of the high frequency induction heating transformer which is this invention. It is explanatory drawing which shows the cyclic | annular cover body side of the high frequency induction heating transformer which is this invention. It is explanatory drawing which shows the cyclic | annular cover body side of the high frequency induction heating transformer which is this invention. It is explanatory drawing which shows the flow of a cooling water. It is sectional drawing which shows the cross section of the conventional transformer main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... High frequency induction heating transformer, 2 ... Core, 21 ... Ring-shaped core 3, 5 ... Cooling water pipe part 4 ... Primary winding (multi-winding conductor), 42 ... One end part, 43 ... The other end, 6 ... secondary winding (secondary conductor), 61 ... annular container, 62, 66 ... annular lid, 63 ... conduit part, 64 ... through hole, 65, 67 ... output terminal electrode, 65a , 67a ... Cooling water hole portion, 66a ... Lead-out portion, 68 ... Packing, 69 ... Insulating material 7, 8 ... Input terminal

Claims (4)

By winding a multi-winding conductor around a hollow core, a primary winding having an annular shape formed by winding the multi-winding conductor is formed on both ends of the core. In the high frequency induction heating transformer enclosed in the formed secondary winding,
In the secondary winding, a cooling water inlet provided to flow cooling water for immersing the primary winding and the core into the secondary winding;
A cooling water outlet provided in the secondary winding for allowing the cooling water in the secondary winding to flow out so as to face the cooling water inlet; Transformer.   The at least one pair of the cooling water inlet and the cooling water outlet provided on the end side of the secondary winding are located along a diagonal line in the longitudinal direction of the secondary winding. The high frequency induction heating transformer according to claim 1.   The cooling water from the cooling water inflow port provided at a position along the diagonal line in the longitudinal direction of the secondary winding on the end side of the secondary winding is oblique to the primary winding and the core. Flowing from the direction, provided at a position along the diagonal line in the longitudinal direction of the secondary winding on the end side of the secondary winding from the oblique direction with respect to the primary winding and the core, The transformer for high frequency induction heating according to claim 2, wherein the transformer flows out from a cooling water outlet. A plurality of ring-shaped cores are connected to each other, and each of the connected ring-shaped cores is provided with a coating for insulation and waterproofing, and each ring-shaped core is compared with the outer diameter. The high-frequency induction heating transformer according to any one of claims 1 to 3, wherein the axial thickness is short.

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