KR20170125247A - Heat Insulation Heater for Electrical Rice Cooker - Google Patents

Abstract

A heat insulation heater for an electrical rice cooker of the present invention comprises: a substrate attached to an outer surface of an electric rice cooker inner pot; a planar heating element attached on an outer surface of the substrate and having an electrode part at both ends based on the width to transmit heat to the inner pot of the electrical rice cooker; an insulation tape attached on an outer surface of the planar heating element and made of a polyimide material; and an insulating tape attached on an outer surface of the insulating tape and made of an aluminum material, wherein the width of the planar heating element is narrower than the width of the substrate, and the width of the heat insulating tape is set to be equal to the width of the planar heating element excluding the electrode part of the planar heating element. The electrical rice cooker can secure electric safety by adjusting the width of the planar heating element so as to satisfy the withstand voltage of an insulation heater for the electrical rice cooker.

Description

[0001] Heat Insulation Heater for Electrical Rice Cooker [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an insulating heater used in an electric rice cooker.

Generally, an electric rice cooker is an apparatus for heating an inner pot provided inside a main body to make a state of high temperature and high pressure to cook the food in a short time.

Therefore, it is essential that a heater is provided inside the rice cooker to heat the inner pot. Such a heater is provided on the lower side of the inner cooker and is provided on the lid of the rice cooker, A top heater for preventing water droplets from forming on the side of the inner pot, and an insulating heater provided on the side of the inner pot.

Here, the warming heater not only performs the cooking function by heating the inner pot of the rice cooker, but also performs a warming function of keeping the remaining food after cooking at a constant temperature.

In this connection, Korean Patent Laid-Open Publication No. 2000-0072886 (hereinafter referred to as "prior art") and the like are known. The prior art suggests an electric rice cooker.

Specifically, in the prior art, a plurality of heater wires having different energizing cycles are provided so as to cook fermented foods such as Cheonggukjang and sikhye, in addition to a cooking function and a warming function, and a fermenting function is performed while performing a fermenting function. It is a technology that can eliminate the deviation and improve the efficiency and control the temperature.

However, in the prior art, since both the heater for maintaining the warming function and the fermenting heater for performing the fermentation function generate heat by using the heater wire, it is difficult to uniformly transmit heat to the inner pot of the rice cooker, .

An object of the present invention is to provide a heat-retaining heater for an electric rice cooker which can transmit heat evenly to an inner pot of an electromagnetic cooker using an area heating element and is excellent in heat generation efficiency.

According to an aspect of the present invention, there is provided a heater for an electric cooker, comprising: a substrate attached to an outer surface of an inner pot of an electric cooker; A planar heating element attached on an outer surface of the substrate and having electrodes at both ends based on a width to transmit heat to the inner pot of the electromagnetic cooker; An insulating tape attached on an outer surface of the planar heating element and made of a polyimide material; And a heat insulating tape attached on an outer surface of the insulating tape and made of aluminum. The width of the surface heating element is narrower than the width of the substrate, and the width of the heat insulating tape is larger than the width of the surface heating element. Is equal to the width of the planar heating element except for the electrode portion of the planar heating element.

Here, the substrate is made of stainless steel.

The planar heating element may include: a base film portion formed of a polyimide material; A carbon heating part formed of carbon material and uniformly dispersed on the surface of the base film part by a screen printing method; And electrode portions formed on both end portions of the surface of the base film portion.

The polyimide material constituting the base film portion and the carbon material constituting the carbon heat generating portion are provided in a weight ratio of 1: 1.

In addition, the carbon material may include 98 to 99 parts by weight of graphite; And 0.1 to 2 parts by weight of a carbon nanotube (CNT).

The width of the insulation tape is the same as the width of the base film portion.

In addition, the heat insulating heater for the rice cooker may further include an adhesive tape attached between the substrate and the surface heating element for attaching the surface heating element to the substrate.

The present invention has the following effects.

First, since the area heating area is wider than that of heating the inner pot of the rice cooker using the heater wire by providing the surface heating element, heat can be uniformly applied to the entire outer surface of the inner pot, thereby maximizing thermal insulation.

Secondly, since the heat generating efficiency is excellent by providing the surface heat generating element, power consumption can be reduced not only when operating in the burnout mode with the largest power consumption but also when operating in the heat keeping mode.

Third, by adjusting the width of the surface heating element, it is possible to satisfy the withstand voltage of the heater for the electric cooker, so that the electrical safety can be ensured.

FIG. 1 is an exploded perspective view showing a coupling relation between a heat-generating heater for an electric cooker and an inner pot according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of the heat shielding heater for the rice cooker of Fig. 1 taken along line AA. Fig.
3 is an exploded cross-sectional view illustrating widths of respective components in the heat shielding heater for the rice cooker of FIG.
4 is a graph showing power consumption according to the conventional operation of the heat shielding heater for an electric cooker.
FIG. 5 is a graph showing power consumption according to the operation of the warming heater for an electric cooker according to the embodiment of the present invention.
FIG. 6 is a graph showing a deviation temperature according to the operation of the heat shielding heater for an electric cooker according to the embodiment of the present invention.
FIG. 7 is a graph showing the warmth according to the operation of the warming heater for an electric cooker according to the embodiment of the present invention.

Hereinafter, a detailed description of related art will be omitted if it is determined that the gist of the present invention may be unnecessarily obscured. In addition, numerals used in the description of the present invention are merely an identifier for distinguishing one component from another.

In addition, the terms used in the specification and claims should not be construed in a dictionary meaning, and the inventor may, on the principle that the inventor can properly define the concept of a term in order to explain its invention in the best way, And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Therefore, the embodiments shown in the present specification and the drawings are only exemplary embodiments of the present invention, and not all of the technical ideas of the present invention are presented. Therefore, various equivalents It should be understood that water and variations may exist.

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

≪ Explanation of constituent elements of the heater for electric rice cooker >

FIG. 1 is a cross-sectional view showing components of an electric heater for an electric cooker according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the heaters for electric cooker of FIG. 1 taken along line AA, 2 is an exploded sectional view showing the widths of the respective components in the heat shielding heater for the rice cooker of FIG.

1 is a perspective view of a heater for an electric rice cooker according to an embodiment of the present invention; FIG. 3 is a cross- An insulating tape 130, an insulating tape 140, and an adhesive tape 150.

The substrate 110 may be attached to the outer surface of the rice cooker inner pot 10 and may be made of stainless steel, which is a material having excellent thermal conductivity. As shown in FIG. 1, the substrate 110 is formed in a hollow cylindrical shape so that the inner surface of the substrate 110 can be attached or coupled to the outer surface of the inner pot 10 for efficient heat retention of the inner cooker 10. .

The planar heating element 120 is attached on the outer surface of the substrate 110. As shown in FIG. 2, electrodes are provided at both ends of the planar heating element 120 on the basis of the width, and heat is generated by power application. And serves to transmit heat to the inner pot 10 of the rice cooker. That is, since the heat generated from the planar heating element 120 is transmitted to the inner pot 10 of the electromagnetic cooker through the substrate 110 having excellent heat conductivity, the planar heating element 120 is heated by the inner pot 10 of the electromagnetic cooker It serves to provide heat or warmth.

To this end, the planar heating element 120 may include a base film portion 121, a carbon heating portion 122, and an electrode portion 123.

The base film part 121 is attached on the center part in the width direction on the outer surface of the substrate 110 and may be provided in the form of a film made of polyimide.

The carbon heating part 122 may be made of carbon and uniformly dispersed on the surface of the base film part 121 according to a screen printing method. Here, the carbon material may include 98 to 99 parts by weight of graphite and 0.1 to 2 parts by weight of carbon nanotubes. Such carbon nanotubes can be classified into a single walled carbon nanotube (SWCNT), a double-walled carbon nanotube (DWCNT), a thin multi-walled carbon nanotube, And a multi-walled carbon nanotube (MWCNT), or a combination thereof.

More specifically, the planar heating element 120 can be manufactured by the following method.

First, a carbon material containing 49.9 g of graphite and 0.1 g of MWCNT is heat-treated at a temperature of 1,000 ° C. to 1,200 ° C. for 1 hour, and the heat-treated carbon material is subjected to a stirring process using a dispersing impeller and a 3 roll mill 3 Roll Mill), a paste-like carbon heating unit 122 is manufactured through a milling process.

Thereafter, the carbon heating unit 122 manufactured in the form of a paste is printed on the surface of the base film unit 121 in the center of the base film unit 121 in the width direction according to the screen method, The electrode unit 123 is printed on the both end surfaces of the base film unit 121 with the carbon heating unit 122 as a center and with the width as a reference, thereby producing the planar heating element 120. It is preferable that the electrode unit 123 prints on both end surfaces of the base film unit 121 so that a part of the electrode unit 123 overlaps with the carbon heating unit 122 in order to generate heat of the carbon heating unit 122.

The polyimide material forming the base film part 121 and the carbon material forming the carbon heating part 122 are preferably provided in a weight ratio of 1: 1 for efficient heat generation.

The width W ₄ of the carbon heating portion 122 in the planar heating element 120 or the width W _{1 of the} electrode portion 123 in order to satisfy the withstand voltage of the heater for an electric cooker according to the embodiment of the present invention W _3), the width of the carbon heating element 122 comprising a (W ₄₎ is as shown in Figure 3, is preferably smaller than the width provided (W ₇₎ of the substrate (110).

In addition, since the present invention provides the inner pot 10 of the rice cooker with the surface heat generating element 120, the heat generating area can be widened more than that of the inner pot 10 of the rice cooker using the heater wire It is possible to uniformly heat the entire outer surface of the inner pot 10, thereby maximizing the warmth.

The insulating tape 130 is attached on the outer surface of the surface heating element 120 and may be made of a polyimide material like the base film 121 having excellent insulating properties. In addition, the insulating tape 130 serves to protect the planar heating element 120.

3, the width W ₂ of the insulating tape 130 is set to be equal to the width W ₅ of the base film portion 121 so as to correspond to the entire width of the area heating element 120 .

The heat insulating tape 140 is attached on the outer surface of the insulating tape 130 to transmit the heat generated through the surface heat emitting body 120 to the inside of the surface heat emitting body 120. For this purpose, Aluminum). That is, the heat insulating tape 140 enhances the effect of keeping the heat generated in both directions (inside and outside) through the surface heating element 120 in the inside direction of the surface heating element 120 (the inner pot direction of the rice cooker) .

3, the width (W ₁ ) of the heat insulating tape 140 is set so that the width (W ₁ ) of the carbon (C 1) that directly acts as a heat generating part in the surface heat emission element 120, in order to increase heat transfer efficiency toward the inner pot 10 of the rice cooker It is preferable that it is the same as the width W ₄ of the heat generating portion 122.

The adhesive tape 150 is attached between the substrate 110 and the surface heating element 120 so as to adhere the surface heating element 120 having no adhesive force to the outer surface of the substrate 110, Nonwoven fabric material. By the adhesive tape 150, the planar heating element 120 can be adhered on the outer circumferential surface of the substrate 110 and can be firmly fixed. It is preferable that the width W ₆ of the adhesive tape 150 is equal to the width W ₅ of the base film portion 121 of the surface heating element 120.

<Withstanding voltage test>

3, in order to measure the heating area, the heating value, and the withstand voltage of the heat shielding heater 100 for an electric rice cooker according to the embodiment of the present invention, experiments were performed by varying the widths of the carbon heating zones in the surface heating body 120, The results are shown in Table 1 below.

Width of carbon heating part The width of the carbon heating portion including the electrode portion Width spaced from electrode to substrate Heating area Withstanding voltage test Example 1 35mm 39mm 2.5 mm 250.25 cm ² fail Example 2 31mm 35mm 4.5mm 221.65 cm ² fail Example 3 30mm 34mm 5.0mm 214.50 cm ² pass Example 4 25mm 29mm 7.5mm 178.75 cm ² pass

<The width of the substrate (W _7): 44mm, width of the base film portion (W _5): 44mm, width of the electrode (W _3): 3mm, carbon heat generating portion and the electrode portion overlap width (d): 1mm>

3, the width of the carbon heat generating portion 122 including the electrode portion 123 of Table 1 is set to W ₄ (see FIG. ₃ ), except for the width d of overlapping the electrode portion 123 and the carbon heat generating portion 122. + 2 x (W ₃ -d). Using this formula, the width of the carbon heat generating portion 122 including the electrode portion 123 of Embodiment 3, which is the most preferable embodiment in Table 1, can be calculated to be 2 x 3 mm + 30 mm-2 x 1 mm = 34 mm )to be.

The widths from the electrode portion 123 to the substrate 110 in Table 1 are the widths from the both ends of the electrode portion 123 to both ends of the substrate 110 in the width direction. 3, the width W ₄ +2 of the carbon heat generating portion 122 including the electrode portion 123 in the width W ₇ of the substrate 110 is equal to the width W ₂ + × (W ₃ -d)) and subtracting it by 2. That is, the distance from the electrode portion 123 to the substrate 110 can be calculated by the formula: {W ₇ - (2 x W ₃ + W ₄ -2 x d)} 2. Using the above equation, the width of the gap between the electrode portion 123 of the third embodiment and the substrate 110 in Table 1 is (44 mm-34 mm) / 2 = 5 (mm).

Therefore, only when the widths spaced from the electrode part 123 to the substrate 110 are 5.0 mm or more through the above Table 1, the heater 10 for an electric rice cooker according to the embodiment of the present invention is acceptable in the withstand voltage test Able to know. In addition, when the width from the electrode portion 123 to the substrate 110 is 5.0 mm (the width of the area heating element: 34 mm), the withstand voltage is satisfied and the exothermic area (214.50 cm ² ) is wider It can be seen that the heating effect is more excellent because the amount of heat generation is larger.

Accordingly, in the case where the width of the carbon heating unit 122 is 30 mm and the width of the surface heat emission element 120 including the electrode unit 123 is 34 mm according to the third embodiment of the present invention, It is possible to provide a warmth suitable for the inner pot 10 of the rice cooker by satisfying the withstand voltage and ensuring a sufficient heat generating area.

<Characteristic Analysis>

FIG. 4 is a graph showing power consumption according to operation of a conventional heater for a rice cooker, FIG. 5 is a graph showing power consumption according to the operation of the heater for an electric cooker according to an embodiment of the present invention, 6 is a graph showing a deviation temperature according to the operation of the thermo-electric cooker for an electric cooker according to the embodiment of the present invention, and FIG. 7 is a graph showing the heat insulation according to the operation of the thermo-electric cooker for an electric cooker according to the embodiment of the present invention .

The heat retaining heater 100 for an electric rice cooker according to the embodiment of the present invention may include a substrate 110, an area heating body 120, an insulation tape 130, 140 and the length and width of the adhesive tape 150 are most suitably set and are shown in Table 2 below.

Board The base film portion Carbon heating part The electrode portion Isolated Tape Insulating tape Adhesive tape Length 743mm 743mm 715mm 727mm 743mm 724mm 743mm width 44mm 42mm 30mm 3mm 42mm 30mm 42mm

The respective constitutions of the heater 100 for the rice cooker according to the embodiment of the present invention are provided with the width and length as shown in Table 2 in order to efficiently provide the warming resistance to the inner pot 10 of the rice cooker while satisfying the withstand voltage And the characteristics such as the power consumption due to the operation of the thermo-electric heater 100 for the rice cooker, the deviation temperature inside the inner pot 10, and the warmth property were analyzed by applying the same.

As shown in FIG. 4, the conventional electric heater for a rice cooker (a wire heater) consumes about 55 watt when operated in a burning mode in which the power consumption for heat generation is the greatest, ), The power consumption is about 53w.

On the other hand, as shown in FIG. 5, the heat-retaining heater 100 for an electric rice cooker according to the embodiment of the present invention has a power consumption of about 50 w when operated in the burnout mode for heat generation, The power consumption is about 46 W, so that the overall power consumption for heat generation can be reduced as compared with the above-described conventional heaters for rice cookers.

As shown in FIG. 6, the internal heater temperature of the conventional rice cooker (comparative example) when operating in the burnout mode and the keep-warm mode, The heating temperature of the rice cooker can be evenly increased. Therefore, it is possible to maximize the warmth of the rice cooker.

7, the heat-retaining heater 100 for an electric rice cooker according to the embodiment of the present invention generally includes a top heater disposed in a lid of an electromagnetic cooker and a heater disposed inside the electromagnetic cooker for heating the food Since the temperature is generally the same as that of the cooker, it can provide the warmth of the rice cooker.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. And the scope of the present invention should be understood as the scope of the following claims and their equivalents.

Description of the Related Art [0002]
100: Heated heater for rice cooker
110: substrate
120: plane heating element
121: base film portion
122: Carbon heating part
123:
130: Insulated Tape
140: Insulation tape
150: Adhesive tape

Claims (7)

A substrate attached to the outer surface of the rice cooker inner pot;
A planar heating element attached on an outer surface of the substrate and having electrodes at both ends based on a width to transmit heat to the inner pot of the electromagnetic cooker;
An insulating tape attached on an outer surface of the planar heating element and made of a polyimide material; And
And an insulating tape attached on an outer surface of the insulating tape and made of aluminum material,
Wherein a width of the planar heating element is set to be narrower than a width of the substrate and a width of the heat insulating tape is set equal to a width of the planar heating element excluding an electrode part of the planar heating element.
Heated heater for rice cooker.
The method according to claim 1,
Characterized in that the substrate is made of stainless steel material
Heated heater for rice cooker.
The method according to claim 1,
The planar heating element,
A base film portion provided from a polyimide material;
A carbon heating part formed of carbon material and uniformly dispersed on the surface of the base film part by a screen printing method; And
And an electrode portion provided on both ends of the surface of the base film portion, the electrode portion being made of silver (Ag)
Heated heater for rice cooker.
The method of claim 3,
A polyimide material constituting the base film part and a carbon material constituting the carbon heating part are provided in a weight ratio of 1: 1
Heated heater for rice cooker.
The method of claim 3,
The carbon material may include,
98 to 99 parts by weight of graphite; And
0.1 to 2 parts by weight of a carbon nanotube (CNT)
Heated heater for rice cooker.
The method of claim 3,
Wherein a width of the insulating tape is equal to a width of the base film portion
Heated heater for rice cooker.
The method according to claim 1,
In the above-described heat-retaining heater for an electric cooker,
And an adhesive tape attached between the substrate and the planar heating element for attaching the planar heating element to the substrate.
Heated heater for rice cooker.

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