JP6143696B2 - High frequency induction heating device - Google Patents

Description

  The present invention relates to a high frequency induction heating apparatus that heats a member to be heated by a high frequency heating coil.

  The high frequency induction heating is a direct heating method in which an induction current is generated in a member to be heated by passing a high frequency current through a coil and the member to be heated is heated by Joule heat. In principle, the surface of the metal member can be heated intensively, and a constant amount of heat can be input to the heated member regardless of the ambient temperature, allowing rapid heating, shrink fitting, melting of the metal, etc. Used in many ways. However, since the amount of heat input to the member to be heated depends on the material and the positional relationship with the coil, there is a disadvantage that temperature distribution is likely to occur in the member to be heated. Further, unlike the heating by the atmospheric temperature, the amount of heat input does not depend on the temperature difference between the heat source and the heated member, so it is difficult to keep the heated member at a uniform temperature. For example, in the coating and drying process where baking is performed for several tens of minutes at about 150 ° C., it is required to maintain the entire object to be heated at a uniform temperature in order to satisfy the required coating film performance. In order to apply, it is necessary to devise to suppress the temperature distribution.

For example, by arranging a metal tube on the inner surface of the heating coil, the entire heated member is uniformly heated by radiant heat from the metal tube heated by induction heating (for example, Patent Document 1). reference).
In addition, a ring made of non-ferrous metal is placed around the object to be heated so that an eddy current that generates a magnetic flux in the direction opposite to the magnetic flux generated by the high frequency flows at a position corresponding to the outer peripheral surface of the location where overheating is prevented. By doing this, there is one that prevents local overheating (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 02-297888 (FIG. 1) JP 2002-343550 A (FIG. 1)

  In the conventional high-frequency induction heating method, the amount of heat input depends on the induced electromotive force and the electrical resistance. Therefore, when heating a member to be heated composed of multiple materials, the heat generation density differs between regions of different materials. , The temperature difference increases. In addition, regarding a member to be heated having a complicated shape such as having a thin portion locally, a temperature difference during heating increases due to a difference in heat capacity between regions having different shapes.

  The present invention has been devised to solve the above-described problems, and can be cited as a merit of induction heating by suppressing temperature variation in a heated member due to the material and shape. It aims at providing the high frequency induction heating apparatus which enables uniform heating of a to-be-heated member, implement | achieving rapid heating.

The high-frequency induction heating device according to the present invention is arranged in the vicinity of a heating coil that generates an induction current in a heated member by heating a high-frequency current and heats the heated member, and the heated member. An auxiliary heating member that partially heats the heated member; and a shielding member made of a nonmagnetic metal material that partially shields the magnetic field around the heated member that is heated by the heating coil, One planar portion constituting the shielding member is disposed in a direction perpendicular to the direction of the magnetic field formed by the heating coil , and the shielding member suppresses heating by the auxiliary heating member. To do .

According to the high frequency induction heating device of the present invention, the member to be heated is induction-heated while being locally heated , and overheating due to the auxiliary heating is suppressed by the shielding member to adjust the heating state of the member to be heated. Is possible.

It is a block diagram of the high frequency induction heating apparatus by Embodiment 1 of this invention. 3 is a perspective view of a main part of a heating coil portion of the high frequency induction heating device according to Embodiment 1. FIG. FIG. 3 is a schematic diagram showing a magnetic field distribution in a heating coil section in the first embodiment. It is a principal part perspective view of the heating coil part which shows Embodiment 2 of this invention. 6 is a schematic diagram showing a magnetic field distribution in a heating coil section in Embodiment 2. FIG. It is a principal part perspective view of the heating coil part which shows Embodiment 3 of this invention. 6 is a cross-sectional view of a heating coil unit according to a comparative example of Embodiment 3. FIG. It is sectional drawing of the heating coil part which concerns on the Example of Embodiment 3 of this invention. 6 is a diagram illustrating a temperature history of a member to be heated according to a comparative example of Embodiment 3. FIG. It is a figure which shows the temperature history of the to-be-heated member which concerns on the Example of Embodiment 3. FIG. It is a principal part perspective view of the heating coil part which shows Embodiment 4 of this invention.

Embodiment 1 FIG.
Hereinafter, the high frequency induction heating apparatus in Embodiment 1 of this invention is demonstrated with reference to FIGS. 1 is a schematic configuration diagram showing a high-frequency induction heating apparatus according to Embodiment 1 of the present invention. The high frequency induction heating apparatus according to the first embodiment is characterized in that an auxiliary heating member is provided so as to cover a portion where uneven heating of the member to be heated occurs. The part where the heating unevenness of the member to be heated is, for example, a protrusion-shaped part as shown in the schematic diagram of the heating coil part in FIG. When such a protrusion-shaped part is made of a material other than magnetic metal, the temperature rise by high frequency induction heating tends to be slower than the other part.

  As shown in FIG. 1, in the high frequency induction heating apparatus, a high frequency current 2 is generated by a high frequency oscillator 1 (for the sake of convenience, only the flow direction is indicated by an arrow), and the current is suitably increased by a high frequency current transformer 3. Then, the current is passed through the heating coil 4. An alternating magnetic flux (not shown) generated by the high-frequency current 2 flowing through the heating coil 4 penetrates the heated member 5, so that an induced current 6 (flow direction is indicated by an arrow) is generated in the heated member 5. The heating member 5 is heated by Joule heat according to its inherent resistance value. Therefore, since the direct heating method is capable of generating heat to the heated member 5 without using a medium for transporting thermal energy such as air, the energy input efficiency to the heated member 5 is good. . In order to suppress the temperature rise due to Joule heat generated in the heating coil 4 by the high-frequency current 2 and radiant heat from the heated member 5 during heating, a cooling water circulation device 7 is provided to cool the heating coil 4 inside. Circulating water.

  FIG. 2 is an enlarged view of the heating coil portion of FIG. 1 (for convenience, only the heating coil 4 is shown in a sectional view), and an outline of the heating coil portion of the high frequency induction heating device according to the first embodiment is shown. FIG. The high-frequency induction heating apparatus according to the first embodiment includes a heating coil 4 and an auxiliary heating member 8 disposed in the vicinity of an accessory 5b that is a protrusion-shaped portion of the member to be heated 5. The substantially cylindrical member to be heated 5 is arranged in a space surrounded by the heating coil 4, and is composed of a cylindrical main body portion 5a made of a magnetic metal material and a projection-shaped accessory 5b made of a nonmagnetic metal material. . In addition, the to-be-heated member 5 may be arrange | positioned in the position facing the heating coil 4 at the time of a heating. The auxiliary heating member 8 disposed in the vicinity of the accessory 5 b of the heated member 5 is held between the heated member 5 and the heating coil 4 using a resin stand or the like. In the high frequency induction heating apparatus according to the first embodiment, the induction current 6 is generated and heated in the member to be heated 5 and the auxiliary heating member 8 by the high frequency current 2 generated by the high frequency oscillator 1.

  As described above, in the induction heating method, the amount of heat input to the member to be heated depends on the material of the member to be heated and the positional relationship with the coil, so that a temperature distribution is likely to occur in the member to be heated. In particular, a general induction heating device that oscillates in a frequency range of about 30 kHz can efficiently heat a metal having magnetism such as iron, but is not suitable for a nonmagnetic metal material such as copper. Since the magnetic permeability of the material is extremely small as compared with the magnetic metal material, the amount of induced current is small, and it is often impossible to sufficiently heat. Therefore, when the above-described heated member 5 is constituted by the main body portion 5a made of a magnetic metal material and the accessory 5b made of a nonmagnetic metal material, a temperature difference of several tens to several hundred degrees is generated between the two.

  In the high frequency induction heating device according to the first embodiment, unlike the conventional induction heating device, an auxiliary heating member made of a magnetic metal material that is easily affected by induction heating is located near the accessory 5b made of a nonmagnetic metal material. 8 is arranged. The auxiliary heating member 8 is characterized in that the heat capacity is smaller than that of the member to be heated 5 and the temperature of the member to be heated 5 is rapidly increased by induction heating.

  In the high frequency induction heating apparatus according to the first embodiment, an induction current (not shown) is generated in the auxiliary heating member 8 by the high frequency current 2 flowing through the heating coil 4, and the auxiliary heating member 8 is heated. At this time, since the auxiliary heating member 8 has a smaller heat capacity than the member to be heated 5, the temperature of the auxiliary heating member 8 rises quickly and reaches a temperature higher than the target heating temperature of the member to be heated 5. Since the accessory 5b made of a nonmagnetic metal material is disposed in the vicinity of the auxiliary heating member 8, the accessory 5b is supplementarily heated by the radiant heat from the auxiliary heating member 8. At this time, since the auxiliary heating member 8 is locally disposed only in the vicinity of the accessory 5b and does not cover the main body 5a, the amount of heat applied to the main body 5a is generated by the induced current 6. Compared to Joule heat, it is negligibly small and does not affect the temperature of the main body 5a. In this way, by using the auxiliary heating member 8 heated to a high temperature by induction heating as a heat source, for example, a member to be heated rapidly and uniformly by an induction heating method alone without adding another type of heat source such as a halogen lamp. 5 can be heated.

  Here, the form suitably used as the auxiliary heating member 8 will be described. As the magnetic metal material constituting the auxiliary heating member 8, the larger the amount of heat generated by induction heating, the better. That is, a metal having high magnetic permeability and high electrical resistance is preferred. As such a material, in addition to pure metals such as iron, nickel, and cobalt, alloys such as carbon steel and ferritic stainless steel can be used. In the case of using the above material as the material of the auxiliary heating member 8, the high frequency induction heating device according to the present invention can be preferably used.

  In addition, the auxiliary heating member 8 has a shape including at least one flat portion such as a thin plate shape, and preferably has a shape that can surround the accessory 5b with a low heat capacity. Furthermore, the auxiliary heating member 8 is formed so as to have a wider surrounding area with respect to the accessory 5b, such as a U-shape, an L-shape, or a curved surface, with respect to the accessory 5b. The amount of radiant heating to 5b increases. Moreover, in the high frequency induction heating apparatus according to the first embodiment, the power consumption of the power source increases as the temperature of the auxiliary heating member 8 increases, so that the auxiliary heating member 8 has a thin plate shape with a low heat capacity from the viewpoint of power consumption. It is preferable that

  FIG. 3 is a schematic diagram showing the distribution of the magnetic field around the heating coil 4 when the high-frequency current 2 flows through the heating coil 4. For example, when the heating coil 4 is a solenoid coil, a vertical magnetic field 9a (indicated by a solid arrow in the figure) is generated in the heating coil 4. This magnetic field 9a is a vertical direction in the drawing, and in the case of FIG. Since the high-frequency current 2 is an alternating current, its direction changes with time, and accordingly, the magnetic field 9a inside the heating coil 4 changes with time in the vertical vertical direction alternately, and the heated member 5 is changed according to the amount of change. An induced current 6 is generated. At this time, when the direction of the magnetic field 9a is parallel to the surface direction of the auxiliary heating member 8, the auxiliary heating member 8 is caused by the induced current 6 because the surrounding magnetic field converges on the auxiliary heating member 8 made of a magnetic metal material. There is a characteristic that the temperature rises easily. For this reason, in the case where the surface direction of at least one plane portion of the auxiliary heating member 8 is installed in parallel with the direction of the magnetic field 9a, the effect of auxiliary heating is obtained, and the high frequency induction heating device according to the present invention is preferably used. Can be used.

The heated member 5 shown in FIGS. 2 and 3 is assumed to be a container of a cylindrical iron-based component such as a compressor or a fire extinguisher, for example, but the same effect can be obtained even in another shape such as a flat plate shape. Can be obtained.
The accessory 5b according to the first embodiment has been described as an example of a case made of a non-magnetic metal, but it is difficult to raise the temperature by induction heating compared to the main body 5a regardless of the shape or material. In this case, since the effects of the present invention can be obtained, the shape and material are not particularly specified. In the first embodiment, the case where a solenoid coil is used as the heating coil 4 has been described as an example. However, since the effect of the present invention can be obtained even with other heating coils, the heating coil 4 is particularly shaped. It is not specified.

  In the above first embodiment, the batch charging type usage method in which the single heated member 5 is heated by the single heated coil 4 has been described. However, the heated member 5 is continuously conveyed to the heated coil 4. Similarly, in the continuous charging type heating apparatus, auxiliary heating using the auxiliary heating member 8 can be performed, and the scope of application of the present invention is not limited to the conveying method. The same applies to other embodiments described later.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIGS. In addition, about the part which is common in Embodiment 1, and the part which carries out the same effect | action, the same code | symbol is attached | subjected and description is abbreviate | omitted.
FIG. 4 is a main part perspective view showing an outline of a heating coil part of the high-frequency induction heating device according to Embodiment 2 of the present invention. The high-frequency induction heating device according to the second embodiment includes a heating coil 4, a body portion 5 a made of a magnetic metal material, disposed in a space facing the heating coil 4 or in a space surrounded by the heating coil 4, and the body The portion 5a is made of a magnetic metal material, and includes a heated member 5 constituted by an accessory 5c having a small heat capacity with respect to the main body portion 5a, and a shielding member 10 disposed in the vicinity of the accessory 5c. In the high frequency induction heating apparatus according to the second embodiment, the induction current 6 is generated and heated in the heated member 5 having the accessory 5c by the high frequency current 2 generated by the high frequency oscillator 1. Note that the accessory 5c is, for example, a protrusion-shaped part protruding from the main body part 5a.

  When the main body portion 5a and the accessory 5c are both made of a magnetic metal material and the heat capacity of the accessory 5c is smaller than that of the main body portion 5a as in the second embodiment, it is caused by the difference in heat capacity between the two. And since the accessory 5c heats up rapidly compared with the main-body part 5a, the temperature difference of several tens-several hundred degrees occurs between both.

  In the high frequency induction heating device according to Embodiment 2 of the present invention, a shielding member 10 made of a nonmagnetic metal material is disposed in the vicinity of the accessory 5c. Further, the magnetic field around the accessory 5c can be suppressed (shielded) by an induced current (not shown) flowing through the shielding member 10.

  An induction current is generated in the shielding member 10 by the high-frequency current 2 flowing through the heating coil 4. However, since the induced electromotive force is smaller in the nonmagnetic metal material than in the magnetic metal material, the generated Joule heat is generated from the magnetic metal material. It is small compared to the heated member 5. At this time, the magnetic field around the accessory 5 c is superimposed on the magnetic field generated by the induced current flowing through the shielding member 10. Therefore, when the directions of the magnetic fields are opposite, the magnetic field around the accessory 5c is weakened by the shielding member 10, and the heating amount of the accessory 5c can be suppressed. Here, since the shielding member 10 is locally disposed only in the vicinity of the accessory 5c and does not cover the main body 5a, the influence of the reverse magnetic field generated by the induced current flowing through the shielding member 10 is affected by the main body. It does not reach 5a and does not affect the temperature of the main body 5a. For this reason, even when the member to be heated 5 has the accessory 5c having a smaller heat capacity compared to the main body 5a, it is possible to heat rapidly and uniformly.

  Here, the form used suitably as the shielding member 10 is described. As the nonmagnetic metal material of the shielding member 10, the smaller the amount of heat generated by the induced current, the better. That is, the nonmagnetic metal material having the lower electrical resistance is more suitable. As such a material, in addition to pure metals such as gold, silver, aluminum, and copper, alloys such as austenitic stainless steel can be used. In the case of using the above material as the material of the shielding member 10, the apparatus according to the present invention can be suitably used.

  Next, arrangement | positioning of the shielding member 10 used suitably is demonstrated using FIG. FIG. 5 is a schematic diagram showing the distribution of the magnetic field when the shielding member 10 is arranged in the space in the heating coil 4 through which the high-frequency current 2 (not shown) flows. Here, it is preferable that the shielding member 10 has a shape that can easily form a loop of an induced current in a direction opposite to the high-frequency current 2 flowing through the heating coil 4. For example, when a flat plate is used as the shielding member 10, a heating coil is formed in the surface direction in accordance with the change of the magnetic field penetrating the surface direction by arranging the surface direction of at least one plane portion perpendicular to the magnetic field 9a. 4, an inductive current is generated in the direction opposite to that of the high-frequency current 2 (not shown) flowing through the magnetic field 9, so that a magnetic field 9 b (in the opposite direction to the magnetic field 9 a on the inner side of the shielding member 10) Indicated by broken arrows in the figure). For this reason, the superposition of the magnetic field 9a and the magnetic field 9b suppresses the magnetic field in the region where the accessory 5c located on the extension line of the shielding member 10 in the thickness direction of the shielding member 10 is disposed with respect to the magnetic field 9a. The amount of heat generated by heating is reduced, and overheating of the accessory 5c is suppressed. In this way, when one flat portion of the shielding member 10 is arranged perpendicular to the direction of the magnetic field 9a and the magnetic field around the accessory 5c is weakened (shielded), the effect of suppressing overheating of the accessory 5c is obtained. The high-frequency induction heating apparatus according to the present invention can be suitably used.

  In the second embodiment, the case of the accessory 5c in which the object of overheating suppression is a protrusion-shaped part has been described. However, the object of overheating suppression is guided in comparison with the main body part 5a regardless of its shape and material. The temperature can be easily increased by heating, and the effects of the present invention can be obtained in all cases where the shielding member 10 can be disposed. In the second embodiment, the case where a solenoid coil is used has been described as an example. However, the effect of the present invention can be obtained with a heating coil having other shapes.

Embodiment 3 FIG.
A third embodiment will be described with reference to FIG. In addition, about the part which is common in Embodiment 1 and 2, and the part which carries out the same effect | action, the same code | symbol is attached | subjected and description is abbreviate | omitted.
The high-frequency induction heating device according to the third embodiment is characterized by including both the auxiliary heating member 8 shown in the first embodiment and the shielding member 10 shown in the second embodiment.
FIG. 6 is a main part perspective view showing an outline of a heating coil part of a high frequency induction heating device according to Embodiment 3 of the present invention. The high-frequency induction heating device according to the third embodiment includes a heating coil 4 and a body portion 5a made of a magnetic metal material and a nonmagnetic metal disposed in a space facing the heating coil 4 or in a space surrounded by the heating coil 4. Heated member 5 composed of accessory 5b made of material and accessory 5c made of magnetic metal material, auxiliary heating member 8 disposed in the vicinity of accessory 5b, and shielding disposed in the vicinity of accessory 5c The configuration includes the member 10.

  When the member to be heated 5 has both the accessory 5b and the accessory 5c described above, in the member to be heated 5, the temperature reached by the member to be heated 5 varies due to the reasons described in the first and second embodiments. . At this time, by arranging the auxiliary heating member 8 and the shielding member 10 in the vicinity of each other, without affecting the heating amount of the main body 5a, the attachment 5b and the main body 5a generated in the accessory 5c The temperature difference can be suppressed at the same time, and heating can be performed rapidly and uniformly by the induction heating method alone without adding another type of heat source.

Here, since the form suitably used as the auxiliary heating member 8 and the shielding member 10 is the same as that described in the first and second embodiments, the description thereof is omitted.
Next, the feasibility and effects of the present invention as described above will be described with reference to comparative examples and examples. In addition, the Example mentioned later is an example, This invention is not limited to this example, As long as the objective of this invention is achieved, without deviating from this invention, various conditions can be employ | adopted. Needless to say.

(Comparative example)
In order to explain the effect of the high-frequency induction heating device according to Embodiment 3 of the present invention, first, a high-frequency heating device of a general type (a type that does not use the auxiliary heating member 8 and the shielding member 10) is used as a comparative example. Shown in FIG. 7 is a cross-sectional view of a heating coil portion of a high-frequency induction heating apparatus that is a comparative example, and is a diagram showing a positional relationship between the heating coil 4 and the member to be heated 5 and the like.
As the heating coil 4, a solenoid coil made of a copper pipe having an outer diameter D of Φ350 mm, a height H of 350 mm, and a winding number of 10 was used. At an ambient temperature of 20 ° C., the heated member 5 has an outer diameter D of Φ20 mm, a height H of 100 mm, and a pipe-shaped accessory 5b made of oxygen-free copper, as well as an outer diameter D of Φ20 mm and a height H of 100 mm. It has a pipe-shaped accessory 5c made of SUS430, and is composed of a cylindrical pressure vessel steel plate having an outer diameter D of 180 mm, a height H of 180 mm, and a plate thickness t of 5 mm. The heated member 5 was placed on the resin block 11 and installed in the center of the heating coil 4 to perform a heating test. Here, a resin block 11 made of Beth Thermo F manufactured by Nikko Kasei Co., Ltd. was used for the stage on which the member 5 to be heated was installed. For heating, a high-frequency induction heating device D-5TM manufactured by Shimada Rika Kogyo Co., Ltd. was used. The heating conditions were an oscillation frequency of 28 kHz, a current value flowing through the heating coil 4 of 100 A, and a power supply voltage of 270 V. In addition, at the time of a heating, the temperature rise of the heating coil 4 is suppressed by circulating cooling water through the heating coil 4. The temperature change of the member 5 to be heated was measured by a thermocouple 12a, 12b, 12c (K-type thermocouple) attached to each surface by spot welding.

(Example)
An example according to the third embodiment of the present invention will be described. FIG. 8 is a cross-sectional view of the heating coil portion of the high-frequency induction heating device according to the present embodiment, and shows the positional relationship among the heating coil 4, the heated member 5, the auxiliary heating member 8, the shielding member 10, and the like. The auxiliary heating member 8 according to the present embodiment has a U-shaped cold rolled steel sheet having a plate thickness (not shown) of 2 mm, a width W of 50 mm, a length (not shown) of 60 mm, and a height h of 120 mm. It was fixed by the resin stand 13 made of Vesthermo F in an arrangement (shape) facing the side surface and the back surface of the accessory 5b. Here, the resin stand 13 is fixed to the resin block 11. Further, the shielding member 10 according to the present embodiment has a U-shaped tough pitch copper having a plate thickness d (not shown) of 1 mm, a width W of 60 mm, a length (not shown) of 100 mm, and a height h of 120 mm. It was fixed using the resin stand 13 in the arrangement (shape) facing the upper and lower surfaces and the back surface of the accessory 5c. In addition, the apparatus, heating conditions, and ambient environment used in the heating experiment were the same as those in the comparative example for comparison with the comparative example.

  At this time, the temperature history of the heated member 5 in the comparative example is shown in FIG. Moreover, the temperature history of the to-be-heated member 5 in an Example is shown in FIG. In the case of the comparative example of the third embodiment, as shown in FIG. 9, the temperature rise tendency of the main body 5a, the accessory 5b, and the accessory 5c of the member to be heated 5 varies, and the accessory 5c made of a magnetic metal material. It is understood that the temperature rising tendency is the highest, and then the temperature rising tendency of the main body 5a and the accessory 5b made of a nonmagnetic metal material is the lowest. On the other hand, in the case of the example, as shown in FIG. 10, it can be seen that the temperature rise variation in each part is small, and when the time reaches 600 s, the temperature is raised to the same level in all parts. Thus, the auxiliary heating effect of the accessory 5b by the auxiliary heating member 8 and the uniform heating effect of the heated member 5 by the overheating suppression effect of the accessory 5c by the shielding member 10 were recognized.

  According to Embodiment 3 of the present invention, when the member to be heated 5 has a region (accessory 5b) where it is difficult to raise the temperature locally by induction heating, the auxiliary heating member 8 is used to heat the member to be heated by induction heating. With the radiant heat from the auxiliary heating member 8 that has been raised to the target temperature of the member 5 or higher, the temperature of the region can be raised to a temperature that is comparable to that of the other regions. Further, when the member to be heated 5 has a region (accessory 5c) that easily heats up locally by induction heating, the temperature of the region rises to the same level as other regions. Can be suppressed. For this reason, even the member to be heated 5 having a complicated structure can be heated rapidly and uniformly.

Embodiment 4 FIG.
The fourth embodiment will be described with reference to FIG. In addition, about the part which is common in Embodiment 1-3, and the part which carries out the same effect | action, the same code | symbol is attached | subjected and description is abbreviate | omitted.
In the above-described third embodiment, the high-frequency induction heating apparatus having both the auxiliary heating member 8 and the shielding member 10 has been described. However, in the fourth embodiment, the shielding member 10 is configured to suppress heating of the auxiliary heating member 8. It is characterized by having been arranged in.
FIG. 11 is a main part perspective view showing an outline of the heating coil part of the high-frequency induction heating device according to Embodiment 4 of the present invention. The high-frequency induction heating device according to the fourth embodiment includes a heating coil 4, an auxiliary heating member 8 disposed in the vicinity of the accessory 5 b of the member to be heated 5, and a shielding member disposed in the vicinity of the auxiliary heating member 8. 10 is included. The member to be heated 5 is disposed at a position facing the heating coil 4 or in a space surrounded by the heating coil 4, and includes a main body portion 5 a made of a magnetic metal material and an accessory 5 b made of a nonmagnetic metal material.

  In the high frequency induction heating apparatus according to the first and third embodiments, as described in the first embodiment, in order to raise the temperature of the auxiliary heating member 8 to be higher than the temperature of the member to be heated 5, The power consumption increases according to the amount of heating. Therefore, the smaller the heat capacity of the auxiliary heating member 8, the more the power consumption of the high frequency induction heating device can be suppressed. However, when the heat capacity of the auxiliary heating member 8 is small, the auxiliary heating member 8 is rapidly heated to assist. As a result, the temperature difference between the heating member 8 and the member to be heated 5 increases, and as a result, the accessory 5b is rapidly heated by the radiant heat from the auxiliary heating member 8, and the temperature difference with the main body 5a may increase. .

In the fourth embodiment, as shown in FIG. 11, the shielding member 10 is arranged in the vicinity of the auxiliary heating member 8. For this reason, by suppressing the induced current generated in the auxiliary heating member 8 by the shielding member 10, it is possible to suppress a sudden temperature rise of the accessory 5 b due to overheating of the auxiliary heating member 8 and increase the heat capacity of the auxiliary heating member 8. Therefore, the member 5 to be heated can be heated uniformly. Therefore, even when the heat capacity of the auxiliary heating member 8 is small, the auxiliary heating member 8 can be held at a suitable temperature, and the entire heated member 5 is uniformly heated while minimizing power loss. It becomes possible to do.
At this time, since the suitable form as the shielding member 10 which suppresses the heating of the auxiliary heating member 8 is the same as the shielding member 10 applied to the accessory 5c in the second embodiment, the description thereof is omitted here.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

DESCRIPTION OF SYMBOLS 1 High frequency oscillator, 2 High frequency current, 3 High frequency current transformer, 4 Heating coil, 5 Heated member, 5a Body part, 5b, 5c Accessories, 6 Induction current, 7 Cooling water circulation device, 8 Auxiliary heating member, 9a, 9b Magnetic field, 10 shielding member, 11 resin block, 12a, 12b, 12c thermocouple, 13 resin stand.

Claims (8)

When a high-frequency current is applied, an induction current is generated inside the heated member, the heating coil that heats the heated member, and the heating member that is disposed in the vicinity of the heated member, partially assisting the heated member An auxiliary heating member for heating, and a shielding member made of a nonmagnetic metal material that partially shields the magnetic field around the heated member heated by the heating coil,
One planar portion constituting the shielding member is disposed in a direction perpendicular to the direction of the magnetic field formed by the heating coil , and the shielding member suppresses heating by the auxiliary heating member. High frequency induction heating device. In the vicinity of the partially formed projected part on the heated member, the high-frequency induction heating apparatus according to claim 1, wherein said auxiliary heating element is disposed. 3. The high frequency induction heating apparatus according to claim 1, wherein the auxiliary heating member is made of a magnetic metal material. The high-frequency induction heating device according to any one of claims 1 to 3 , wherein the auxiliary heating member is made of at least one material selected from iron, nickel, cobalt, carbon steel, and ferritic stainless steel. . The one plane part which comprises the said auxiliary | assistant heating member is arrange | positioned in the direction parallel to the direction of the magnetic field formed by the said heating coil, The one of Claim 1 to 4 characterized by the above-mentioned. High frequency induction heating device. The high frequency induction heating device according to any one of claims 1 to 5, wherein the shielding member is made of at least one material selected from gold, silver, aluminum, copper, and austenitic stainless steel. The heated member is heat-treated in a state of being placed on the resin block, and the auxiliary heating member is held by a resin stand fixed to the resin block, and is disposed in the vicinity of the heated member. The high frequency induction heating device according to any one of claims 1 to 6 , wherein the high frequency induction heating device is characterized. The heated member is heat-treated in a state of being placed on the resin block, and the shielding member is held by a resin stand fixed to the resin block, and is disposed in the vicinity of the heated member. The high frequency induction heating apparatus according to any one of claims 1 to 7 .