JP2002305074A - Induction heating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost of a heating element even if it is difficult to drill a long hole, and enable to heat fluid efficiently. SOLUTION: In an induction heating equipment constituted with a pipe-shape passage 12 formed with a non-inductive heater substance so that fluid may pass through it, heating elements 13, 14, and 15 installed inside the passage, and a high frequency heating coil 16, which is wound around the outside of the passage and makes induction heating the heating element, the heater elements have two or more penetrating holes 13a, 13b, and so on, and 14a, 14b, and so on, and the like, prepared so that the fluid may pass in them, moreover two or more of them are installed with predetermined interval separated in the direction of the passage, and the coil is wound so that continuous magnetic flux may be obtained in the heating element and the interval part 18. The predetermined interval is 10% or less of full length in the passage direction of the heating elements installed of two or more. Two or more heating elements have the predetermined intervals by the spacer 21 projected from the above heating element with size corresponding to the predetermined intervals. The positions of the penetrating holes are deviated in the direction crossing with right angle to the passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating apparatus in which a fluid is brought into contact with a heating element heated by induction heating to produce a high-temperature fluid.

[0002]

2. Description of the Related Art As one technique for raising the temperature of a fluid, an induction heating device is known. This induction heating device is a device in which a heating element is installed in a passage member through which a fluid passes, and a current is passed through a coil wound around the outer periphery of the passage member to cause the heating element to generate heat, thereby raising the temperature of the fluid. This induction heating device is preferable in that it is easier to control the temperature of the fluid, can perform rapid heating, and is cleaner because it uses electric power, as compared with a device that directly uses the combustion energy of fuel.

As shown in FIG. 4, when electric power is supplied from a high-frequency power supply 3 to a coil 2, an induction heating device 1 generates an eddy current in a heating element 4 by electromagnetic induction, and the heating element 4 generates heat. When a fluid to be heated is supplied from one end into the bobbin 5 at an appropriate flow rate, the fluid flows through the holes 4a, 4b, 4c,
Are heated while passing through… and the temperature rises from the other end and exits.

[0004]

When such a large amount of heat is required, such an induction heating device 1 conventionally has a long heating element 4, but has a high Curie point and excellent heat resistance at high temperatures. However, there is a problem that the heating cost of the heating element increases. In particular, there is a problem that machining of a long hole is difficult and not only increases the machining cost but also may not be possible. The present invention
An object of the present invention is to provide an induction heating device that can reduce the manufacturing cost of a heating element and efficiently heat a fluid even if a material having a long hole is difficult to process.

[0005]

Means of the present invention include a cylindrical passage formed by a non-induction heater so that a fluid passes therethrough, a heating element installed in the passage, and A high-frequency heating coil wound around the heating element for induction heating the heating element, wherein the heating element is provided with a plurality of through holes so that a fluid passes therethrough, and has a predetermined interval in a direction of the passage. Two or more are installed,
The coil is wound so that a continuous magnetic flux is generated in the heating element and the interval (claim 1).

In this means, when power is supplied to the coil to cause the heat generating element to generate heat and fluid is supplied from one end of the passage, the fluid is heated from the other end of the passage and comes out. The provision of two or more heating elements is intended to provide a necessary amount of heat for the desired heating of the fluid and to make the length of the heating element required to be relatively long even for a material which is difficult to process, and to arrange the heating elements at a predetermined interval. The reason for this is to improve the heating efficiency of the fluid. That is, when manufacturing a relatively long heating element having no space at all, for example, when the material is a heat-resistant magnetic ceramic / metal composite material suitable for the heating element, the total length is 50 mm, 1
If the diameter is about 00 mm, the diameter of the through hole through which the fluid passes can be processed up to about 5 mm. However, if the total length is longer than that, it becomes difficult to process the through-hole, so that the processing cost increases and the processing may not be possible. In view of the manufacturing cost of the heating element, the division is naturally superior. In general, it is considered that the heat efficiency is worse when a plurality of heating elements are arranged. Obtained. Table 1 shows the results.

[0007]

[Table 1]

[0008] In the experiment, two types of heating elements, an integral type and a split type, were used, the coil was the same over the entire length of the heating element, the fluid was steam, steam of the same temperature was supplied, and the outlet temperature was the same. The amount of passing steam was compared. As can be seen from Table 1, it can be seen that the split type has a larger amount of passing steam and has better thermal efficiency than the integrated type. In other words, by providing a predetermined interval and generating a continuous magnetic flux also at the interval, it is possible to increase the thermal efficiency and to have an advantage that the manufacturing cost of the heating element is lower than that of the integrated type. found. The reason why the thermal efficiency is improved is that, after the fluid passes through the through-holes of the heating element in a laminar flow state, the fluid becomes turbulent when passing through the space between the heating elements, and the fluid temperature is uniformed in that part. It is thought that the temperature rises efficiently due to the process of entering. In other words, when the fluid passes through the through-hole in a laminar flow state, the central portion is hardly heated, but when the fluid is stirred by being turbulent on the way, the low temperature of the central portion is also equalized. This is because it will be appropriately heated.

In the above means, the predetermined interval is 10% of a total length of the two or more heating elements in the passage direction.
The following configuration is preferable (claim 2). In this configuration, the temperature can be increased efficiently by setting the predetermined interval to 10% or less. If the amount is too small, turbulence does not easily occur, and the efficiency becomes poor.

[0010] In the above means, the two or more heating elements may be positioned so as to be at the predetermined interval by a spacer protruding from the heating element with a dimension corresponding to the predetermined interval. (Claim 3). In this configuration, by providing the heating element with the spacer, a predetermined interval can be maintained, and a stirring state due to the turbulent flow of the fluid can be obtained. Preferably, the position of the spacer is provided so as to be located at the center of the cross section of the fluid passage, whereby the eddy current is concentrated on the skin portion of the heating element. There is almost no.
Furthermore, it is better to provide the spacer and the heating element integrally,
This eliminates the displacement of the spacer when the fluid passage is installed horizontally. In addition, the manufacture of the heating element and the spacer is easier than in the case of separate heating elements.

In the above-mentioned means, it is preferable that the heat generating elements adjacent to each other at intervals are installed so that the positions of the through holes are different from each other in a direction perpendicular to the passage. In this configuration, the through holes are not coaxially aligned between the adjacent heating elements, and the turbulent state of the fluid can be secured.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 (a) and 2 (b). This induction heating device 11
Is composed of a passage 12, heating elements 13, 14, 15, coils 16, and the like. The passage 12 is a fluid passage through which a fluid to be heated passes, and is formed by a ceramic pipe 17 made of a nonmagnetic material and having excellent heat resistance, and is an inner hole of the pipe 17. This passage 12 is formed of, for example, silicon nitride.

The heating elements 13, 14, 15 have a predetermined length L.
And is inserted so as to form a space 18 having a predetermined space h in the axial direction of the passage 12. Although three heating elements are shown in the drawing, at least two or more heating elements are provided with an interval therebetween. Each of the heating elements 13, 14, 15 has a large number of through holes 13a, 13b, 13c,.
a, 14b, 14c,..., 15a, 15b, 15c,... are provided as flow paths through which the fluid passes through the heating elements 13, 14, 15. The interval dimension h is the through hole 13a,
13b, 13c,..., 14a, 14b, 14c,.
(Hereinafter referred to as through-holes 13a, etc.) cause turbulent flow of the fluid in the gaps 18, and the heating elements 13, 14, 15 in the axial direction It is desirable that the total length L is 10% or less in order to cause appropriate turbulence. Further, each of the heating elements 13, 1
For example, the through holes 13a and the like 4 and 15 are arranged such that the positions in the direction perpendicular to the passage 12 are different between the heating elements adjacent to each other before and after, for example,
Using three heating elements having the same shape and dimensions, the heating elements 13, 14, and 15 are installed so that the positions of the through holes 13a and the like do not coincide with each other by being rotationally displaced around the axis in order. That is,
Each heating element is installed in the passage 12 so that the phase of each through hole is shifted. Thereby, turbulence is more likely to occur. The heating elements 13, 14, and 15 are formed of a substance that is heated to a high temperature by electromagnetic induction heating, for example, a heat-resistant magnetic alloy or a heat-resistant magnetic ceramic / metal composite material.

The coil 16 is a high-frequency heating coil for inductively heating the heating elements 13, 14, 15;
It is wound over a heat insulating material 19 provided outside the pipe 17 forming the passage 12 so that a continuous magnetic flux is generated at 4, 15 and a predetermined interval h. The coil 16 receives power from a high-frequency power supply 20, that is, a high-frequency inverter.

In the induction heating device 11, when power is supplied to the coil 16 from the high frequency power supply 20, eddy currents are generated in the heating elements 13, 14, 15 by electromagnetic induction, and the heating element 1
3, 14, and 15 generate heat. For example, this heating element 13,
14 and 15 generate 1200 ° of heat due to large specific resistance.
The temperature can be raised to about C. When the fluid is supplied at an appropriate flow rate from one end of the passage, the fluid is generated by the heating elements 13, 14, 1
5 while passing through the through holes 13a and the like. Further, when the fluid passes through the through hole of the heating element 13, a turbulent flow is generated in the gap 18 of the predetermined spacing dimension h, and then enters the through hole of the next heating element 14, and is further turbulent in the next gap 18. A flow is generated, and further enters the next through hole of the heating element 15 and exits the passage 12 on the outlet side. The turbulence causes the fluid to be stirred and the fluid to be heated uniformly, and the fluid that has passed through the heating element 5
The temperature is raised to 000 ° C.

A second embodiment will be described with reference to FIG. This embodiment is different from the first embodiment in that the gap 1
Spacers 21 and 22 are provided so as to determine an interval dimension h of 8, and the heating element 14 and the spacer 21 and the heating element 15 and the spacer 22 are integrally formed. The spacers 21 and 22 are provided at the center of the heating element 5 and formed in a projecting shape so as not to prevent turbulent flow of the fluid. Other configurations are the same as those in the first embodiment, and are denoted by the same reference numerals and description thereof is omitted.

[0017]

According to the first aspect of the invention, the manufacturing cost of the heating element can be reduced. In addition, since the turbulent flow occurs when the fluid passes through the predetermined interval between the heating elements after passing through the through-hole of the heating element, the fluid can be heated uniformly and efficiently. According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the temperature can be more effectively increased by setting the predetermined interval to 10% or less of the total length in the axial direction of the two or more heating elements. Has the effect that can be. The invention according to claim 3 has, in addition to the effects of the invention according to claim 1 or claim 2, an effect that the turbulence of the fluid does not occur and the heating element is easily manufactured. . According to the fourth aspect of the invention, in addition to the effects of any one of the first, second, and third aspects, the turbulence of the fluid can be further increased, so that the temperature of the fluid is more uniformly increased. It has the effect that it can be done.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional schematic perspective view for explaining a first embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional perspective view for explaining a second embodiment of the present invention.

FIG. 3 is a perspective view illustrating a form of a heating element according to a second embodiment.

FIG. 4 is a partial longitudinal sectional schematic perspective view of a conventional induction heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Induction heating apparatus 12 Passage 13, 14, 15 Heating body 16 Coil 17 Pipe 18 Space part 19 Insulation material 20 High frequency power supply 21 Spacer

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shigeki Yamamoto 3-12 Kanbei-cho, Himeji-shi, Hyogo Pref. Inside the Himeji Higashi Plant of Rainbow Technology Co., Ltd. No.12 F-term in Himeji East factory of Nijigi Co., Ltd. (reference) 3K059 AA08 AB04 AD03 AD40 CD79

Claims (4)

[Claims] 1. A tubular passage formed by a non-induction heating element so that a fluid passes therethrough, a heating element installed in the passage,
A high-frequency heating coil wound around the outside of the passage for induction heating the heating element, wherein the heating element is provided with a plurality of through-holes so that a fluid passes therethrough; At predetermined intervals in the direction of
The above is installed, and the coil is wound so that a continuous magnetic flux is generated in the heating element and the interval. 2. The induction heating apparatus according to claim 1, wherein the predetermined interval is equal to or less than 10% of a total length of the two or more heating elements in the passage direction. 3. The heating device according to claim 2, wherein the two or more heating elements are positioned so as to be at the predetermined intervals by spacers projecting from the heating elements with dimensions corresponding to the predetermined intervals. The induction heating device according to claim 1 or 2. 4. The heating element according to claim 1, wherein said heat generating elements adjacent to each other at intervals are provided so that positions of said through holes are different from each other in a direction perpendicular to said passage. Item 4. The induction heating device according to any one of Items 3 to 7.