JPH04249884A - High frequency magnetic flux generating coil holder in induction heating system - Google Patents

Abstract

PURPOSE:To carry out heating operation of a heating member of an induction heating system stably by decreasing temperature difference in the heating member. CONSTITUTION:An heating member 3 is arranged in a coil holder in one united body so that a high frequency magnetic flux generating coil 1 can be held together. Thereby, the distance between the high frequency magnetic flux generating coil 1 and the heating member 3 can be controlled accurately both in small numbers of parts and in a simple constitution, and temperature distribution of the heating member 3 can be also uniformized.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating device used, for example, in a bookbinding device.

0002

[Prior Art] Conventionally, heating means for bookbinding uses a sheathed heater as a heat source to heat melt adhesive set between the folded part of a bookbinding member and a bundle of sheet-like recording materials to be bound. Bookbinding was performed by heating the paper to melt the hot-melt adhesive.

0003

[Problems to be Solved by the Invention] However, in the above-mentioned heating method, since a sheathed heater is used as a heat source, it takes time to raise the temperature of the heat generating member, and even if heating of the heat generating member is started, thermal melting occurs. It took a considerable amount of time to reach a predetermined temperature suitable for the melting temperature of the adhesive. For this reason, a bookbinding apparatus using induction heating, which has a heating time several times faster than that of a sheathed heater, can be considered. A possible configuration of an induction heating device includes a high-frequency magnetic flux generating coil that generates high-frequency magnetic flux in response to a signal from a control device, a coil support member that supports the coil, and a coil holder that fixes the high-frequency magnetic flux generating coil so that it does not move. , has a heat generating member made of a magnetic material and placed on the coil, a heat generating member supporting member supporting the heat generating member, and a pressing member fixing the heat generating member.

However, in such an induction heating device for bookbinding, the temperature variation on the surface of the heat generating member is large due to the non-uniformity of the high frequency magnetic flux generated by the device. There is a possibility that areas where the agent has dissolved well and areas where it has not dissolved sufficiently coexist. That is, it is difficult to accurately determine the gap, particularly the parallelism, between the high-frequency magnetic flux generating coil and the heat generating member, resulting in variations in the distribution of magnetic flux density on the surface of the heat generating member. That is, there is also the problem that the amount of heat generated by the heat generating member differs depending on the location. Additionally, if the temperature of the heat-generating member is set higher than the melting temperature of the adhesive and the heating time is set for a long time, the binding member may become overheated or deformed during binding. There was also a fear. Furthermore, since the heating coil 1 and the load 4 are supported separately, the number of parts increases and the material cost increases. Since a heat generating member support member and a coil holder are required, there is also the problem that the gap between the high frequency magnetic flux generating coil and the heat generating member cannot be reduced beyond a certain level.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an induction heating device that enables a heating effect with a reduced surface temperature difference of a heat generating member.

[0006]

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned circumstances. For example, as shown with reference to FIGS. 1, 4, and 5, In the induction heating device, the induction heating device includes a flat high-frequency magnetic flux generating coil (1) and a heat-generating member (3) heated by Joule heat of an eddy current caused by the high-frequency magnetic flux generated by the high-frequency magnetic flux generating coil (1). High frequency magnetic flux generating coil (1)
a coil support member (2) that supports the high frequency magnetic flux generating coil (1), a coil holder (15, 20, 22) that fixes the high frequency magnetic flux generating coil (1) to the coil support member (2), and a coil support member (2) that supports the heat generating member (
3), the coil holder (15, 20, 2
2).

[0007] Furthermore, the coil holder (20) is characterized in that the high-frequency magnetic flux generating coil (1) is sandwiched and fixed from both sides.

[0008] Furthermore, the high-frequency magnetic flux generating coil (1) is constructed by laminating at least two coils (25a, 25b), and the coil holder (22) has a spacer function of forming a gap between the two coils. It is characterized by having a protrusion with.

[0009]

[Operation] Based on the above configuration, the heat generating member (3) is supported by the heat generating member support portion (16), and the heat generating member support portion (16) is provided integrally with the coil holder (15) in a simple structure. Hold the high frequency magnetic flux generating coil (1). As a result, the high frequency magnetic flux generating coil (1) and the heat generating member (3)
You can accurately manage the distance from the heat-generating component (
3) The temperature distribution can be made uniform.

Further, the coil holder (20) is configured to be separated into left and right sides so as to sandwich the high frequency magnetic flux generating coil (1) from both sides. As a result, the widthwise expansion of the heat generating member (3), which causes variations in the surface temperature of the heat generating member (3), is reduced. Further, the high frequency magnetic flux generating coil (1) is connected to at least two or more coils (25a, 2
5b), and the coil holder (22) is provided with a protrusion (23) having a spacer function to create a gap between the two coils (25a, 25b).
5a, 25b) can be freely set, and variations in temperature distribution on the surface of the heat generating member (3) can be suppressed with a simple configuration.

Note that the above-mentioned symbols in parentheses are shown for reference to the drawings, and do not limit the structure of the present invention in any way.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a high-frequency magnetic flux generating coil holding device according to a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional side view of the main parts thereof. In the figure, reference numeral 1 indicates a high-frequency magnetic flux generating coil formed into an elongated flat plate shape. This high frequency magnetic flux generating coil 1 is
It is formed of a stranded wire made by twisting a large number of insulating wires each having a self-bonding layer, and is shaped by fusing the self-bonding layer.

Reference numeral 2 designates a coil support member that supports the high frequency magnetic flux generating coil 1. Reference numeral 3 indicates a heat generating member made of a magnetic material and provided above the high frequency magnetic flux generating coil 1. This heat generating member 3 interlinks with the high frequency magnetic flux generated by the high frequency magnetic flux generating coil 1, induces an eddy current according to the density of this magnetic flux, and generates heat by Joule heat.

FIG. 3 shows an electric circuit of an induction heating device for heating the heat generating member 3. As shown in FIG. In the figure, a high-frequency magnetic flux generating coil 1 constitutes a resonant circuit 6 together with a resonant capacitor 5, and generates high-frequency magnetic flux. If, for example, a book to be bound and a hot-melt adhesive for binding are placed on top of the heat generating member 3, binding will be performed in a short time. code 7
is a switching element, which supplies current to the resonant circuit 6 by turning on and off.

Reference numeral 9 denotes temperature detection means for detecting the surface temperature of the heat generating member 3, and numeral 10 denotes a final temperature setting means for setting the final temperature of the heat generating member 3. Reference numeral 11 denotes a temperature determining means that compares the currents of the temperature detecting means 9 and the final temperature setting means 10 and indicates the comparison result. Reference numeral 12 is a DC power supply that supplies DC current to the resonant circuit 6. The temperature control means 13 operates upon receiving a signal from the temperature determination means 11 and drives the switching element 7 .

In FIGS. 1 and 2, reference numeral 15 indicates a coil holder having a heat generating member support portion 16, which fixes the high frequency magnetic flux generating coil 1 to the coil support member 2 and supports the heat generating member support portion 16 to generate heat. The heat generating member 3 is held in contact with the member 3. In this embodiment, the coil holder 15 is made of a shaped article made of a highly heat-resistant phenol resin. Reference numeral 17 indicates that the heat generating member 3 is heated for 1 time.
Reference numeral 9 indicates a heat generating member suppressing member fixed to the coil holder 15.

Next, the operation of this embodiment will be explained.

Simultaneously with the command to start heating, a direct current flows through the high frequency magnetic flux generating coil 1 and high frequency magnetic flux is generated. This high frequency magnetic flux interlinks with the heat generating member 3 made of a magnetic material, and the secondary heat generating member 3 induces an eddy current according to this magnetic flux density and generates heat due to Joule heat. In this way, an object to be heated (not shown) placed on the heat generating member 3 is heated.

At this time, the temperature on the surface of the heat generating member 3 is not the same, but varies depending on the magnetic flux density, causing variations. Factors for this temperature variation include the shape of the high-frequency magnetic flux generating coil 1, variations in the gap between the heat generating member 3 and the high-frequency magnetic flux generating coil 1, especially variations in parallelism, and deformation of the high-frequency magnetic flux generating coil 1. It will be done. The shape of the high-frequency magnetic flux generating coil 1 examines the main performance of the temperature distribution of the heat generating member 3, and as mentioned above, the variation in the gap, particularly the variation in parallelism, has a large influence on the variation.

In particular, when the gap between the heat generating member 3 and the high-frequency magnetic flux generating coil 1 is reduced in order to increase the electric power applied to the heat generating member 3, variations in this gap have a large effect on the temperature distribution. .

In this embodiment, the coil holder 15 is provided with a heat generating member support portion 16 that integrally contacts the heat generating member 3 and supports the heat generating member 3. In this way, the heat generating member support part 16
When the heat generating member 3 comes into contact with the heat generating member 3, the temperature of the surface of the contact portion of the heat generating member 3 with the heat generating member support portion 16 is transmitted to the heat generating member support portion 16 side and is lowered. That is, if the setting position of the heat generating member support part 16 is set at the center of the coil,
The temperature at the center of the coil portion of the high-frequency magnetic flux generating coil 1 where the magnetic flux density is highest can be lowered, and a uniform temperature distribution can be achieved as a whole.

In addition, in this embodiment, the coil holder 15 is constructed of a shaped product made of phenol resin that is integrally provided with the heat generating member support portion 16, so the dimensional accuracy is quite accurate. 15 can accurately set the gap between the high frequency magnetic flux generating coil 1 and the heat generating member 3 including the parallelism. Therefore, the gap between the high-frequency magnetic flux generating coil 1 and the heat generating member 3 can be set to the minimum value, and a highly efficient induction heating device can be provided.

As described above, in this embodiment, by reducing the number of components constituting the induction heating device, the high frequency magnetic flux generating coil 1 and the heat generating member, which are the cause of variations in the heat generating portion of the heat generating member 3, are reduced. It is possible to suppress variations in the gap including the degree of parallelism between the two, and a highly efficient induction heating device can be constructed. At the same time, the heat of the high-temperature portion of the heat-generating member 3 can be dissipated to the surroundings by the heat-generating member support portion 16, and variations in the surface temperature distribution of the heat-generating member 3 can be reduced. Furthermore, by reducing the number of parts, the induction heating device can be manufactured easily.

Next, a second embodiment of the present invention will be explained based on FIG. 4. Components having the same functions as those described in the first embodiment described above are denoted by the same reference numerals, and the description thereof will be omitted.

In the figure, the reference numeral 20 indicates a coil holder, which in this embodiment is constructed of two symmetrical heat-resistant resin molded parts. This coil holder 2
0 is a stepped portion 2 for holding the high frequency magnetic flux generating coil 1.
0a is formed. Reference numeral 21 denotes a coil guide for the center of the high-frequency magnetic flux generating coil 1, which is provided integrally with the coil support member 2. In this way, the high frequency magnetic flux generating coil 1 is held on the coil support member 2 by the coil guide 21.

The operation of this embodiment will be explained below.

The high frequency magnetic flux generating coil 1 is fixed with a self-adhesive layer as in the first embodiment. by the way,
This high-frequency magnetic flux generating coil 1 becomes stronger in terms of strength when the number of turns is large, but when the number of turns is small, twisting and deformation are likely to occur during the assembly process, and in particular, the width is likely to expand. If the high-frequency magnetic flux generating coil 1 is deformed in this way, the temperature distribution on the surface of the heat generating member 3 will be distorted, and temperature variations will become large.

In this embodiment, both sides of the high frequency magnetic flux generating coil 1 held by the coil support member 2 are fixed by coil holders 20 to constitute an induction heating device. For this reason, the above-mentioned high frequency magnetic flux generating coil 1
Deformation, especially an increase in the width of the coil 1, does not occur. Furthermore, since the coil guide 21 is inserted into the center of the high-frequency magnetic flux generating coil 1, it is possible to prevent the high-frequency magnetic flux generating coil 1 from deforming inward due to the pressing pressure applied to the high-frequency magnetic flux generating coil 1 by the coil holder 20.

As described above, according to this embodiment, deformation of the high frequency magnetic flux generating coil 1 in the width direction can be reduced, and variations in the temperature distribution of the heat generating member 3 can be suppressed.

Next, a third embodiment of the present invention will be explained based on FIG. 5.

Components having the same functions as those explained in the first embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted. Reference numeral 22 denotes a coil holder divided into two left and right pieces, and has a protrusion 23 in which a groove 23a is formed. According to this embodiment, the high frequency magnetic flux generating coil 1 explained in each of the above embodiments is laminated in two layers.
a, 25b. That is, the protrusions 23 are inserted between each coil, so that the distance between the coils and the distance between the coils 25a, 25b and the heat generating member 3 can be maintained accurately.

The operation of this embodiment will be explained below. In this embodiment, the high frequency magnetic flux generating coil is composed of coils 25a and 25b stacked in two layers. Upper layer coil 25
a is the lower layer coil 2 that acts as the main magnetic flux generating coil;
5b is placed at a position where the distribution state of magnetic flux density can be corrected. That is, it is arranged in a portion of the heat generating member 3 where the surface temperature is low, and acts to make the surface temperature distribution state of the heat generating member 3 uniform. In other words, by adjusting the positional relationship between the two coils 25a and 25b and the heat generating member 3, the surface temperature distribution of the heat generating member 3 can be changed.

As explained above, according to this embodiment,
Variations in the surface temperature of the heat generating member 3 can be further reduced, and the number of parts can be reduced, so assembly work can be easily performed.

On the other hand, if an induction heating device is constructed without applying the present invention, the high frequency magnetic flux generating coil 1 and the heat generating member 3 will be supported separately, which increases the number of parts and increases costs. It's also expensive. Furthermore, it becomes difficult to accurately determine the gap, particularly the parallelism, between the high-frequency magnetic flux generating coil 1 and the heat generating member 3, and therefore variations occur in the magnetic flux density at the surface temperature of the heat generating member 3. That is, the amount of heat generated by the heat generating member 3 differs depending on the location. Furthermore, since a support member and a coil holder are required to support the heat generating member, the gap between the high frequency magnetic flux generating coil 1 and the heat generating member 3 cannot be reduced beyond a certain level.

On the other hand, according to the induction heating device to which the present invention is applied, the distance between the high frequency magnetic flux generating coil 1 and the heat generating member 3 can be accurately controlled, and the distance between the high frequency magnetic flux generating coil 1 and the heat generating member 3 can be accurately controlled.
temperature distribution can be made uniform.

[0037]

[Effects of the Invention] As explained above, according to the present invention,
By integrating the heat generating member into the coil holder to hold the high frequency magnetic flux generating coil, it is possible to accurately manage the distance between the high frequency magnetic flux generating coil and the heat generating member with a simple configuration with a small number of parts. The temperature distribution of the member can be made uniform.

[0038] Furthermore, by adopting a configuration in which the high-frequency magnetic flux generating coil is held between the coil holders so as to be sandwiched from both sides, it is possible to suppress the expansion of the high-frequency magnetic flux generating coil in the width direction, which causes variations in the temperature distribution of the heat generating member. This makes it possible to further suppress variations in the temperature distribution of the heat generating member.

Furthermore, the high-frequency magnetic flux generating coil is made by stacking at least two coils, and the coil holder is provided with a protrusion that functions as a spacer to create a gap between the two coils, so that the gap between the two coils can be freely created. can be set, and variations in the temperature distribution on the surface of the heat generating member can be suppressed with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a high-frequency magnetic flux generating coil holding device of an induction heating device showing a first embodiment of the present invention.

FIG. 2 is a longitudinal side view as well.

FIG. 3 is an electric circuit of the temperature control section of the heat generating member.

FIG. 4 is an exploded perspective view of main parts of a high-frequency magnetic flux generating coil holding device showing a second embodiment of the present invention.

FIG. 5 is an exploded perspective view of main parts of a high-frequency magnetic flux generating coil holding device showing a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... High frequency magnetic flux generating coil, 2... Coil support member, 3... Heat generating member, 12... DC power supply,
15, 20, 22...coil holder, 16...
Heat generating member support portion, 25a, 25b...High frequency magnetic flux generating coil, 23...Protrusion 23.

Claims (3)

[Claims] 1. A flat high-frequency magnetic flux generating coil connected to a DC power supply, a heat generating member heated by Joule heat of eddy current caused by high-frequency magnetic flux generated by the high-frequency magnetic flux generating coil, and the high-frequency magnetic flux generating coil. A coil support member that supports the high-frequency magnetic flux generating coil, a coil holder that fixes the high-frequency magnetic flux generating coil to the coil support member, and a heat-generating member support portion provided on the coil holder to support the heat-generating member. High-frequency magnetic flux generating coil holding device for induction heating equipment. 2. The high frequency magnetic flux generating coil holding device for an induction heating apparatus according to claim 1, wherein the coil holder sandwiches and fixes the high frequency magnetic flux generating coil from both sides. 3. The high-frequency magnetic flux generating coil is constructed by stacking at least two or more coils, and the coil holder has a projection having a spacer function to form a gap between the two coils. A high frequency magnetic flux generating coil holding device for an induction heating device according to claim 1.