KR19990079866A - Hypoallergenic heating element and its wiring method for reducing microwave frequencies - Google Patents

Abstract

The present invention relates to a hypothermic heating element and a method for connecting the same for reducing microwave radiation, and its object is to focus on arranging four strands of heating wire in two layers, which is easier to manufacture and use than the prior art, and has better heat generation efficiency. In addition, the present invention provides a low-frequency low-frequency electromagnetic wave element and a connection method thereof for reducing low-frequency electromagnetic waves that can more effectively reduce an ELF magnetic field.

The configuration of the present invention in the heating element for reducing the generation of the magnetic field,

Enclose the heating wires (2, 3, 4, 5) of the four strands in small insulated corners in the insulator (1), an insulating material having high electric field strength and excellent heat resistance, and keep the distance between the strands as close as possible. The currents between the heating wire strands are the same in magnitude but opposite in direction, and the currents between the heating wire strands facing each other diagonally are the same in size and direction. At the other end, connect the remaining two strands (8) and install the power input terminals (9, 10).

Description

Hypoallergenic heating element and its wiring method for reducing microwave frequencies

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a low-frequency electromagnetic wave element and a connection method thereof. In particular, an element for minimizing occurrence of an extremely low frequency (ELF) magnetic field, such as a commercial power supply frequency (60 Hz), and a connection method thereof. It is about.

These devices include earth beds, stone beds, water beds, medical bedding, electric blankets, electrical blankets, chairs, sheets, heating floors, electrical heating walls, heating tiles that can be installed on floors or walls, electric heaters, and heat treatment devices. It can be widely used in medical and medical equipment.

The claim that electromagnetic waves in the commercial power frequency (60 Hz) and the ultra-low frequency (ELF) band to which it belongs can have a detrimental effect on health has been made for a long time by the scientific community in developed countries, but in recent years, the public interest in social welfare and health has increased. It is a high concern.

Although there are no specific and active regulations or standards with clear conclusions, the Swedish standards MPR II and TCO, which are implemented in the case of VDT (Visual Display Terminal) such as computer monitors, are generally very low frequency. It can be seen that the (ELF) regulatory limits for electric and magnetic fields are very tightly set at 10 V / m to 25 V / m and 2 mG to 2.5 mG, respectively, at normal working distances (30 to 50 cm from the surface of the VDT). .

And, unlike VDT, electric heaters are usually used in close proximity to the human body and have a characteristic that they work on all parts of the human body continuously for a long time in a state of weakening of physiological activity such as bedtime and rest.

Considering such a situation, it is required to reduce the ELF electric field and the magnetic field generated in the heater as close to zero as possible at a normal working distance.

Normally, the electric field can be sufficiently reduced by sealing the electric element around with a conductive material such as a metal and connecting the shield with an electric ground, but in the case of a magnetic field, shielding is not easy.

However, the heaters generate heat by using a relatively large current by using a commercial power supply frequency (60 Hz) power to the heating wire, which is a resistor, to generate a very large magnetic field in the heating element.

Even when a DC power supply is used to prevent this, an ELF magnetic field of considerable magnitude may be generated even by an AC component such as ripple.

Therefore, research to develop a technology to effectively reduce the magnetic field of the heater is important.

In the prior art developed for the above purpose, it was invented to reduce the magnetic field generated in the heater, the two-strand heating element made to be the current direction +,-or-, + (Fig. 1, Korea Utility Model Publication 96- 5022), and a horizontal four-strand heating element (FIG. 2, U.S. Patent No. 4,908,497) in which the current direction is in the order of +,-,-, + or-, +, +,-on the plane; There is a coaxial heating element (Fig. 3, Japanese Patent Publication No. 05-021145) configured in the form of a coaxial line. The basic principle is to reduce the size of the magnetic field by allowing the magnetic fields to cancel each other by the same current flowing in opposite directions. will be.

However, the problem of the prior art as described above is that in the case of a two-strand heating element (Fig. 1), the magnetic field can be significantly reduced within a limit that can narrow the distance between the strands, but the magnetic field of a size that cannot be ignored at a position near the bundle of heating elements. There is a problem that arises.

In addition, in the case of a horizontal four-element heating element (FIG. 2), since the magnetic field canceling effect of the two-strand heating element is repeated, the magnetic field can be greatly reduced compared to two-heating elements having the same distance between heating wire strands. Since it is difficult to bend the heating element in an arbitrary shape because of the large width, it is inconvenient to install the long heating element in an arbitrary curve shape on the heater, and therefore, there is a problem in that the wiring must be wired in a fixed shape on the substrate.

In the case of the coaxial heating element (Fig. 3), the magnetic field is completely canceled when the center of the core and the outer conductor exactly match each other, but when the position is not exactly coincident, a significant magnetic field is generated near the heating wire. It is expensive to produce a precise match, and a large part of the generated heat is concentrated on the insulator trapped between the core and the outer conductor, which may cause excessive heating element temperature.

The object of the present invention for solving the above problems is to focus on arranging four strands of heating wires in two layers, which is easier to manufacture and use than the prior art, and generates a very low frequency (ELF) magnetic field more effectively. The present invention provides a low-frequency heating element and a connection method thereof for reducing microwave frequencies.

1 is a structural diagram of a conventional two-stranded heating element for reducing the magnetic field,

2 is a structural diagram of a conventional horizontal four-wire heating element for reducing the magnetic field,

3 is a structural diagram of a conventional coaxial heating element for reducing a magnetic field,

4 is a basic structural diagram of a heating element according to the present invention;

5 is a preferred embodiment 1 of the present invention,

Figure 6 is a preferred embodiment 2 of the present invention,

7 is a modified embodiment 3 of the present invention;

8 is a cross-sectional view taken along the line AA ′ of FIG. 7;

9 is Example 4 which is another modified embodiment of the present invention;

10 is Embodiment 5 which is another modified embodiment of the present invention;

FIG. 11 is a cross-sectional view taken along the line BB ′ of FIG. 10.

<Description of the symbols for the main parts of the drawings>

(1): insulators (2, 3, 4, 5): heating wire

(6,7,8): Wiring (9,10): Power input terminal

(11): shielding electrode layer (12): insulating protective layer

(13): Insulation Board

(14, 15, 16, 17): elbow connector

When described in detail with reference to the accompanying drawings, the configuration and the operation of the embodiment of the present invention to achieve the object as described above and to perform the task for eliminating the conventional drawbacks.

Figure 4 shows the basic structure of the heating element according to the present invention, the solid line and the circular bar is the heating wire, the arrow indicates the direction of the current.

FIG. 5 shows an insulator 1 that forms the basis of the heating element and respective heating wires 2, 3, 4, and 5 inserted therein, as a preferred embodiment 1 of the present invention. 6 and 7 and the wiring 8 at the other end of the heating element are shown, and the heating element power input terminals 9 and 10 are shown.

FIG. 6 is a structure in which the shielding electrode layer 11 surrounds the insulator 1 and the insulation protection layer 12 surrounds the insulator 1 as the preferred embodiment 2 of the present invention.

7 is a modified embodiment of the present invention as a third embodiment of the circular dotted line represents a bundle of four strand heating wire according to the present invention, the insulation board 13 and the wiring (6,7) of one end of the heating element and the other end of the heating element The wiring 8 and the power input terminals 9 and 10 of the heating element are shown.

FIG. 8 is a cross-sectional view taken along the line AA ′ of FIG. 7.

FIG. 9 is a fourth modified embodiment of the present invention, in which an electric field shielding electrode layer is added to the third embodiment, and includes a shielding electrode layer 11, an insulator 1, and an insulating protective layer 12.

FIG. 10 shows a form in which the width of the heating element of Example 3 is reduced as much as Example 5, which is another modified embodiment of the present invention. The heating elements are arranged at 60 °, 90 °, 120 °, and 180 ° angles. The elbow connectors 14, 15, 16, and 17 are shown.

FIG. 11 is a cross-sectional view taken along the line BB ′ of FIG. 10.

The present invention relates to a novel hypothermic heating element in a bundle of four strands of heating wires.

As shown in FIG. 4, each heating wire strand is located at four corners of a very small square, and each current direction is opposite to the nearest neighboring strand.

If the heating element is configured in this way, the magnetic field canceling effect by the two-pair heating element pair is repeated twice like the flat four-strand heating element, and the occurrence of the magnetic field is greatly reduced. The magnetic field canceling effect is larger than that of the horizontal four-strand heating element having the same distance (FIG. 2), and the symmetry of the heating wire bundle is increased, so that the magnitude of the magnetic field does not change significantly even when the heating element is twisted at an arbitrary azimuth angle.

Therefore, the extremely low frequency (ELF) magnetic field generated when the heaters are arranged at appropriate intervals on the plane to form the heaters is extremely small to be negligible.

In addition, since the heating wire is arranged outside of the insulator and the insulator is not sealed by the heating element, there is little phenomenon of excessive temperature rise of the internal insulator, which is likely to occur in the coaxial heating element, and the generated heat is effectively transferred to the surface of the heater.

Best Mode for Carrying Out the Invention The following describes an optimal embodiment of the present invention.

<Example 1>

5 shows an optimal embodiment according to the invention.

In the insulator 1, which is an insulating material having a high electric field strength and excellent heat resistance, the heating wires (2, 3, 4, 5) of the four strands described above are placed at small square corners, and the distance between the strands is as close as possible. The currents between neighboring heating wire strands are the same in magnitude but opposite in direction, and the currents between the heating wire strands facing each other diagonally are the same in magnitude and direction. 7), and connect the other two strands at the other end (8) and install the power input terminals (9, 10) to configure the heating element of the present invention.

<Example 2>

As shown in FIG. 6, the outside of the insulator 1 of the heat transfer element of Embodiment 1 is wrapped with the shielding electrode layer 11, and the outside of the shielding electrode layer 11 is covered with the insulating protective layer 12 again. It consists of a heating element that adds an extremely low frequency (ELF) electric field shielding layer to 1.

The shielding electrode layer 11 is intended to prevent the very low frequency (ELF) electric field generated from the heating element itself by only grounding the shield when the heating element is used as the non-heating element.

Hereinafter, another embodiment of the present invention will be described.

<Example 3>

FIG. 7 is a modified embodiment of the present invention in which the characteristics of the heating element are implemented on the planar insulating substrate 13, and the bundles of four heating elements are successively arranged as necessary on one insulating substrate 13 in succession. To make one flat heating element.

In this case, each strand in a bundle of heating wires is formed at four corners of a rectangle or a square so as to be suitable for the arrangement of the substrate, and heating wires on the surface of the insulation board 13 have two strands of heating wires at a predetermined interval on the entire surface of the insulation board 13. Arrange the shape and position of upper and lower heating wires to be identical to each other, and realize the heating element by applying an insulator (1) which is an electrical insulation protective film on both heating wires, and then apply the current to the heating wires arranged on the upper and lower layers. Connect the heating wire strands (6, 7) up and down or left and right at one end of the plane side by side, and the other connection (8) and power connection terminals (9, 10) at the other end.

8 is a cross-sectional view taken along the line AA ′ of FIG. 7.

<Example 4>

If necessary, as shown in FIG. 9, the electric field shielding electrode layer 11 may be added on the insulator 1 on the planar heating element of the third embodiment, and the planar heating element may be formed to cover the insulation protection layer 12 thereon.

The length and width of such a substrate-type heating element is generally determined to be convenient to use, but the length of the heating element perpendicular to the heating wire on the plate can be used as many times as desired.

In this case, the electrical connection between the heating elements may be performed by first removing an insulating protective film on the conductor and then soldering, electric welding, or spot welding.

Example 5

As shown in FIG. 10, another linear heating element may be configured by thinning the heating element of Example 3 to include only one bundle of four strand heating elements of the present invention.

When it is necessary to arrange such heating wires, the elbow connectors 14, 15, 16 and 17 of several angles, such as 60, 90, 120 and 180 degrees, can be easily arranged on a plane. To be able.

FIG. 11 is a cross-sectional view taken along the line BB ′ of FIG. 10.

The present invention as described above can reduce the magnetic field much larger than the conventional invention, and because the structure is simple, the manufacturing is relatively simple, economical, small size and large symmetry with respect to the azimuth angle, so that the installation in an arbitrary curved shape on the heating surface It is very simple, it can be applied in various forms, such as the form of a line of a rectangular or circular cross section or a planar shape arranged on a substrate according to various uses, and there is an advantage that the heat generated from the heating wire effectively reaches the heating surface.

Among them, the most important advantage of the present invention is the magnetic field reduction effect, compared with the conventional two-strand (FIG. 1) and four horizontal (FIG. 2) heating elements having the same distance between the heating wire strands of 0.2 mm. Computer simulations show that at a distance of 1 cm from the center, the magnetic field is about 20 times smaller than two-strand heating elements and about two times less than flat four-strand heating elements.

On the other hand, if the bundles of heating wires are regularly arranged at an appropriate distance, the magnetic field becomes spatially uniform at the center of the heating surface due to interactions with neighboring heating wires. Even when comparing the size of the magnetic field for the optimal array spacing to minimize the magnetic field, the magnetic field reduction effect of the heating element of the present invention is also 20 times compared to the two strands (FIG. 1) and the horizontal four-strand heating element (FIG. 2) of the conventional invention. It is confirmed that about 2 to 2 times excellent.

Claims (6)

In the heating element for reducing the occurrence of the magnetic field, Enclose the heating wires (2, 3, 4, 5) of the four strands in small insulated corners in the insulator (1), an insulating material having high electric field strength and excellent heat resistance, and keep the distance between the strands as close as possible. The currents between the heating wire strands are the same in magnitude but opposite in direction, and the currents between the heating wire strands facing each other diagonally are the same in size and direction. And, the other two strands at the other end of the connection (8) and the power input terminals (9, 10) characterized in that the low-frequency electromagnetic wave element for low frequency electromagnetic waves characterized in that the installation. In the heating element for reducing the occurrence of the magnetic field, Enclose the heating wires (2, 3, 4, 5) of the four strands in small insulated corners in the insulator (1), an insulating material having high electric field strength and excellent heat resistance, and keep the distance between the strands as close as possible. The currents between the heating wire strands are the same in magnitude but opposite in direction, and the currents between the heating wire strands facing each other diagonally are the same in size and direction. And connect the remaining two strands at the other end (8) and install the power input terminals (9, 10), and wrap the outside of the insulator (1) with the shielding electrode layer (11), which is a non-heating element, to use the heating element. The shielding body is grounded to prevent the extremely low frequency (ELF) electric field generated from the heating element itself from flowing out, and the outside of the shielding electrode layer 11 is covered with the insulating protective layer 12 again. By the series heating element for extremely low frequency electromagnetic wave decreases. In the heating element for reducing the occurrence of the magnetic field, Four bundles of heating wires can be arranged in series to form a single flat heating element by arranging several wires on a single insulating board 13 as necessary, with each strand in one bundle of heating wires being rectangular or square It is located at four corners, and the heating wire on the surface of the insulated substrate 13 has the same shape as the two stranded heating wires arranged at regular intervals on the entire surface of the insulating substrate 13, and the shape and position of the heating wire up and down coincide with each other. After realizing a heating element by applying an insulator (1), which is an electrical insulating protective film, on the double-sided heating wire, heating wire strands of up and down or left and right at one end of the plane to flow current in opposite directions to the heating wires arranged on the upper and lower layers. (6,7) connected side by side and the other wire (8) and power connectors (9, 10) at the other end By based heating element for extremely low frequency electromagnetic waves, which reduces to the gong. In the heating element for reducing the occurrence of the magnetic field, Four bundles of heating wires can be arranged in series to form a single flat heating element by arranging several wires on a single insulating board 13 as necessary, with each strand in one bundle of heating wires being rectangular or square It is located at four corners, and the heating wire on the surface of the insulated substrate 13 has the same shape as the two stranded heating wires arranged at regular intervals on the entire surface of the insulating substrate 13, and the shape and position of the heating wire up and down coincide with each other. After realizing a heating element by applying an insulator (1), which is an electrical insulating protective film, on the double-sided heating wire, heating wire strands of up and down or left and right at one end of the plane to flow current in opposite directions to the heating wires arranged on the upper and lower layers. (6,7) connected side by side, and at the other end, install the remaining connections (8) and power connectors (9, 10), and again By based heating element for extremely low frequency electromagnetic waves, characterized in that additional reducing lung electrode layer 11 on an insulator (1) and configured to cover the insulating protective layer 12 thereon. The method according to any one of claims 3 and 4, Elbow connector of several angles such as 60 °, 90 °, 120 °, 180 °, etc., when it is necessary to make another heating element by thinning the bundle of the four wire heating wires and to arrange the heating wires. A low-frequency electromagnetic element for low frequency electromagnetic waves, characterized in that it is easily arranged on a plane using a connector (13, 14, 15, 16). In the wiring method of the heating element for reducing the occurrence of the magnetic field, Connect two strands at one end side by side in the horizontal or vertical direction, connect two of the four strands at the other end so that the heating wire four strands form one closed circuit as a whole, and connect one power source to the remaining two unwired strands. When supplying, the electric currents of the nearest neighboring heating wire strands are equal in size but opposite in direction, and the currents of the heating wire strands facing in the diagonal direction are connected to the heating wire strands so that the magnitude and direction are the same. Wiring method for reduction.