JP2013055025A - Multi-division electromagnetic coil for air bubble micronization boiling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-division electromagnetic coil for air bubble micronization boiling in which distribution of a coil is taken into account to adjust a magnetic field applied across the board so that an applied output is distributed, in order to solve the problem that, although there exists a two-split coil or multi-division coil whose objective is uniform heating, it is required to balance magnetic forces between both poles and adjust a magnetic field applied entirely between gaps, for the purpose of realizing air bubble micronization boiling.SOLUTION: A multi-division electromagnetic coil for air bubble micronization boiling is provided which allows practical air bubble micronization boiling by adjusting magnetic balance between an outermost peripheral coil (Ln) and an innermost peripheral coil (L1), being both poles based on the number of turns and the length of Litz wire, distributing magnetic field by using a plurality of independent coils (L2), (L3), and the like which are inserted between the outermost peripheral coil (Ln) and the innermost peripheral coil (L1), for settling an issue of uneven temperature.

Description

The present invention is an electromagnetic coil for use in an electromagnetic cooker, in which a magnetic field formed from the coil is uniform, magnetic flux density is dispersed, temperature unevenness is eliminated, and bubble miniaturization boiling, which is a kind of boiling, is enabled. The present invention relates to a miniaturized boiling electromagnetic coil.

The conventional coil for an electromagnetic cooker could not be heated uniformly because the densely wound coil is the mainstream, the magnetic flux density is concentrated at the center of the donut, and the eddy current is not dispersed and generated.

In order to compensate for this drawback, a two-divided coil and a multi-divided coil have been devised. However, although the effect of distributed heating is exhibited to some extent, it cannot be said to be sufficient uniform heating, and the bubble micronized boiling is achieved as in the present invention. I couldn't go.

  JP 2008-117722 A   JP 2007-257777 A   JP 08-0669867 A   Japanese Patent Application Laid-Open No. 08-055678   Japanese Utility Model Publication No. 06-070193

  Takeshi Ezaki, Takimoto, etc., Masao Kondo “Toshiba Review Vol.59 No.11 (2004)”

However, in Patent Documents 1 and 5, the purpose is only uniform heating, and bubble refinement boiling is not considered. In order to develop bubble refinement boiling, it is necessary to disperse the magnetic field more densely, and by eliminating the unevenness of magnetic flux density and eliminating temperature irregularities, the electromagnetic coil for bubble refinement boiling that enables bubble refinement boiling Was invented by the present invention.

The present invention aims at the following (a) and (b).
(A) Uniform heating is achieved by adjusting the balance of magnetic flux density by equalizing the magnetic force of the outermost coil (Ln) and the magnetic force of the innermost coil (L1) as both poles. An object of the present invention is to provide an electromagnetic coil for bubbling refined boiling that makes possible.
(B) Individually provided divided coil groups promote each other's magnetic field, suppress the magnetic field formed individually, disperse the magnetic field throughout, and realize uniform heating to enable bubble micronization boiling An object of the present invention is to provide an electromagnetic coil for bubbling refined boiling.

Means to solve the problem

In order to solve the above problem, the magnetic balance between the outermost coil (Ln) and the innermost coil (L1), which are both poles, is adjusted by the number of turns and the wire length of the litz wire, and the outermost coil (Ln) ) And a plurality of independent coils (L2), (L3), etc. inserted between the innermost coil (L1) and the like to disperse the magnetic field to eliminate temperature unevenness and enable practical bubble micronization boiling. It is characterized by this.

Effect of the invention

The invention according to claim 1 is the outermost outermost pole that is configured by adjusting the ratio of the optimal number of turns to be antagonized and the line length of the litz wire in which the magnetic balance of the coils (Ln) and (L1) that are bipolar is antagonized. It has a coil (Ln) and an innermost peripheral coil (L1), and distributes the magnetic flux density.

The magnetic fields formed by the outermost coil (Ln) and the innermost coil (L1) that are the two poles are the eddy currents generated by equalizing the magnetic force, the outermost coil (Ln) and the innermost coil ( L1) is most strongly expressed at the center.

The formed magnetic field is inserted between the outermost peripheral coil (Ln) and the innermost peripheral coil (L1) which are both poles, and is affected by the magnetic fields of a plurality of independent coils (L2), (L3), etc. Is distributed, and eddy currents are developed over a wide area.

The invention according to claim 2 (1) adjusts the number of turns of the coil by adjusting the difference in the strength of the magnetic force caused by the difference in the number of turns of the outermost coil (Ln) and the innermost coil (L1) which are both poles. And equalizing.

The magnetic flux density, that is, the strength of the magnetic force is determined by the number of turns of the coil. The larger the number of turns, the stronger the magnetic flux density.

A flat air-core coil has a coil diameter larger than the inner circumference as it goes to the outer circumference, and the outermost coil (Ln) and the innermost circumference coil (L1), which are both poles, have no difference in the number of turns. The magnetic force of the outermost peripheral coil (Ln) whose diameter is increased increases, and the magnetic flux density with the innermost peripheral coil (L1) falls into an imbalance.

It is possible to equalize the magnetic flux density between the outermost coil (Ln) and the innermost coil (L1), which are both poles, by providing a difference in the number of turns of the coil.

The ratio of the number of turns most suitable for equalization is about 1.5 times to about 2 times of the innermost coil (L1) with respect to the outermost coil (Ln) which is bipolar with (Ln) <(L1). It is winding with the number of turns.

In the invention according to (2) of the second aspect, the strength of the magnetic force resulting from the difference in the length of the Litz wire between the outermost coil (Ln) and the innermost coil (L1), which are both poles, is reduced. It is characterized by adjusting and equalizing.

Originally, the strength of the magnetic force is determined by the number of turns of the coil, but there is a large difference even if the length of the litz wire is different.

The outermost outermost coil (Ln) serving as both poles is smaller in number of turns than the innermost innermost coil (L1), but on the other hand, the length of the litz wire is longer and the magnetic force becomes stronger.

Similar to the adjustment of the number of turns, it is not possible to equalize the magnetic force between the outermost coil (Ln) and the innermost coil (L1) which are both poles unless the length of the litz wire is adjusted.

The ratio of the length of the litz wire most suitable for equalization is about twice to about 2 for the outermost coil (Ln) with respect to the innermost coil (L1) that is bipolar with (Ln)> (L1). Require 5 times longer litz wire length.

In the invention according to claim 3, a plurality of independent coils (L2), (L3), etc., inserted between the outermost peripheral coil (Ln) and the innermost peripheral coil (L1), which are both poles, have a constant gap. The magnetic field applied to the whole can be dispersed by being within the range of about 10 mm to about 20 mm.

  Magnetic field distribution diagram of closely wound coils   Magnetic field distribution diagram of electromagnetic coil for bubble miniaturization boiling   Magnetic field distribution diagram in a state where the magnetic force balance between (Ln) and (L1) is unbalanced   Magnetic field distribution diagram in a state where the magnetic force balance between (Ln) and (L1) is balanced   Magnetic field distribution diagram with insertion coil gap narrower than specified range   Magnetic field distribution diagram with insertion coil gap wider than specified range   Plan view showing a state in which eddy currents appear in ripples   Embodiment diagram of multi-divided electromagnetic coil for bubble miniaturization boiling

FIG. 1 shows a magnetic field a and a line of magnetic force b of a normal type closely wound coil 1. The magnetic flux density c is concentrated at the center d, and the eddy current f is most likely to flow at the position of the center d. However, the eddy current f becomes weaker as e moves away from the center d inward and outward, the temperature distribution becomes uneven, and the bubble micronization boiling cannot be expected.

An electromagnetic coil that enables bubble boil-down boiling practically cannot be achieved unless eddy current f appears on the entire surface of the electromagnetic coil, uniform heating is possible, and temperature unevenness is eliminated.

FIG. 2 shows the magnetic field formation of the multi-divided electromagnetic coil 3 for bubble miniaturization boiling.

A constant gap 2 is provided from the innermost peripheral coil (L1) serving as both poles to the outermost peripheral coil (Ln), and independent coils (L2) and (L3) are inserted.

The outermost outermost coil (Ln) and the innermost innermost coil (L1) which are both poles are configured with the number of turns and the coil length at a constant ratio.

The inserted coils (L2) and (L3), etc. are wound in a direction that reduces the number of turns toward the outer periphery, but the inserted coils (L2), (L3), etc. may have the same number of turns.

The problem point is adjusted by the number of inserted coils (L2) and (L3) and the like because the L value is restricted in the matching of the coil and the inverter.

Separately inserted coils (L2) and (L3), etc. contribute to disperse the original magnetic field a between the two poles by forming an independent magnetic field h.

If the magnetic force is equalized between the outermost coil (Ln) and the innermost coil (L1) which are both poles, the magnetic field line b and the magnetic field line b toward the center d of the multi-divided electromagnetic coil 3 for doughnut-shaped bubble miniaturization boiling. A magnetic field a is formed.

The magnetic flux density c concentrates at the center d of the magnetic field lines b formed, that is, the center d of the multi-divided electromagnetic coil 3 for doughnut-shaped bubble miniaturization boiling, and the strongest eddy current f is generated near the center d.

FIG. 3 shows the line of magnetic force b in the case where the balance of the magnetic force between the outermost coil (Ln) and the innermost coil (L1), which are both poles, in the multi-divided electromagnetic coil 3 for bubble miniaturization boiling is unbalanced. The distribution is shown.

When the magnetic force of the outermost coil (Ln) that is the two poles is weaker than that of the innermost coil (L1), the unique magnetic field h that appears in each independent coil (L1) to (Ln) is absorbed by the strong magnetic field a. Thus, the weak magnetic field g becomes difficult or no longer contributes to the entire magnetic field a, and the eddy current f becomes less likely or not generated.

In the case of FIG. 3, since the magnetic force of (Ln) is weak g, a strong magnetic field a appears between (L3) and (L1), and the combined magnetic field line b applied to the whole ignoring the magnetic force of (Ln). Will occur between (L3) and (L1).

On the contrary, when the magnetic force of the innermost coil (L1) is weak, the magnetic flux density c generated in (L1) is also weakened, and the eddy current f is difficult to flow, resulting in temperature unevenness.

FIG. 4 shows that the balance of magnetic force between the outermost coil (Ln) and the innermost coil (L1) which are both poles is balanced, and the inserted independent coils (L2) and (L3) are within the specified gap 2 range. Therefore, each coil (Ln) to (L1) has an influence on the magnetic field a exerted on the whole, and there is no magnetic field a between the gaps 2 between the coils. In part of the magnetic field a, a weak magnetic field i appears, and the strength of the magnetic force is suppressed to form a uniform magnetic flux density c. The eddy current f is applied to the entire surface of the multi-divided electromagnetic coil 3 for bubbling micronization boiling. It can be expressed.

Uniform expression of the eddy current f on the surface of the multi-divided electromagnetic coil 3 for boiled micronized boiling allows the applied output from the inverter to be dispersed and applied to the multi-divided magnetized coil 3 for boiled micronized boiling. Bubble boiling can be achieved.

FIG. 5 shows the case where the gap 2 between the outermost coil (Ln) and the innermost coil (L1), which are both poles, is narrower than the size within a specified range, and the lines of magnetic force b are regarded as a single magnetic field a. Therefore, the eddy current f is concentrated only at the center d of the magnetic field a and e away from the inside and outside as in the case of the densely wound coil 1, and the eddy current f becomes weaker and bubble micronization boiling does not occur.

FIG. 6 shows the case where the gap 2 between the outermost coil (Ln) and the innermost coil (L1), which is both poles, is expanded beyond the specified range, and is expressed from each coil (Ln) to (L1). The unique magnetic field h becomes stronger, the eddy current f also flows in a ripple shape on each coil, and bubble miniaturization boiling also appears in a ripple shape, making it impractical.

FIG. 7 shows an eddy current f flowing in a ripple shape. When a pan filled with water is placed on the eddy current f, a subcooled boiling phenomenon appears along the eddy current f, and a ripple-like bubble is generated. Micronized boiling appears.

FIG. 8 shows that the ratio of the number of turns from the outermost coil (Ln) to the innermost coil (L1), which is both poles, is (Ln) <(L1) 4, and the line length ratio of the litz wire is (Ln)> (L1). The multi-divided electromagnetic coil 3 for bubbling refinement boiling is set to 5 and the gap 2 is also configured within a specified range.

The appearance looks the same as the existing multi-segment coil, but the multi-segment electromagnetic coil 3 for boiled micronized boiling aims to disperse the magnetic field by the number of turns of the coil, the length of the litz wire, and the width of the gap. There is a certain condition, and practical bubble refinement boiling cannot be expected unless these three conditions are satisfied.

DESCRIPTION OF SYMBOLS 1 Closely wound coil 2 Gap 3 Multi-divided electromagnetic coil 4 for bubble refinement | miniaturization boiling (Ln) <(L1) [about 1.5 times-about 2 times]
5 (Ln)> (L1) [about 2 times to about 2.5 times]
a magnetic field b magnetic field line c magnetic flux density d center e f away from inside and outside eddy current g magnetic force is weak (or magnetic field not related to the influence of the whole magnetic field line)
h Original magnetic field i Magnetic field is weak

Claims (3)

A multi-divided electromagnetic coil designed to disperse the magnetic flux density, which eliminates temperature irregularities at the bottom of the pan and allows the subcooled boiling phenomenon to be achieved, enabling bubbles to be used for micro-bubbles. Multi-division electromagnetic coil for miniaturized boiling. The multi-divided electromagnetic coil for boiled micronized boiling according to claim 1, comprising the following features (1) and (2).
(1) The outermost coil (Ln) and the innermost coil (L1), which are both poles, have (Ln) <(L1) in the number of turns, and the ratio is the number of turns in which (L1) is (Ln). On the other hand, it consists of the number of turns that falls within the range of about 1.5 times to about 2 times.
(2) The outermost coil (Ln) and the innermost coil (L1), which are both poles, have a Litz wire length (Ln)> (L1), and the ratio is (Ln) (L1). On the other hand, the line length is in the range of about 2 to 2.5 times. A plurality of coils inserted between the outermost coil (Ln) and the innermost coil (L1) which are both poles are configured as independent coils (L2), (L3), etc. with a certain gap. The gap is in the range of 10 mm or more and 20 mm or less regardless of the wire diameter, and one litz that reaches the outermost coil (Ln) through the innermost coil (L2), (L3), etc. The multi-divided electromagnetic coil for bubbling refined boiling according to claim 1, wherein the coil is wound with a wire.

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