JP2021126474A - Electric kettle having latent heat storage agent built-in and manufacturing method therefor - Google Patents

Abstract

To provide an electric kettle and a manufacturing method therefor, the electric kettle having a latent heat storage agent for heat retention built-in and characterized in that a container having the latent heat storage agent and metal built-in is set so as to be in contact with an inner wall periphery and a bottom and a heat retention effect for a long period of time is maintained by the latent heat storage agent, in order to solve problems of conventional electric kettles in that once boiled hot water's temperature reduces after power-off of an electric kettle and requires re-heating by performing power-on again in the case of use after a certain period of time and in that temperature reduction inside the electric kettle is caused by contact with outside air from a hot water supply port and re-heating by performing power-on again is required for availability for use as hot water in the case of high use frequency.SOLUTION: A container having a latent heat storage agent and metal built-in is set so as to be in contact with an inner wall periphery and a bottom of an electric kettle. A heat retention effect for a long period of time can be maintained by the latent heat storage agent.SELECTED DRAWING: Figure 1

Description

The present invention is characterized in that a container containing a latent heat storage agent and a metal is set so as to be in contact with the peripheral portion and the bottom of the inner wall of the electric kettle, and the latent heat storage agent maintains a heat retention effect for a long period of time. It relates to the manufacturing method.

The latent heat storage material of the present invention is derived from food, and mainly contains a latent heat storage agent containing myoban as a main component, which can maintain a temperature of 80 ° C to 95 ° C, and erythritol and mannitol, which can maintain a temperature of 100 ° C or higher. It is a latent heat storage agent used as an ingredient, and is characterized by being effective for a long period of time and being able to be used repeatedly at the same time.

The latent heat storage capacity of the latent heat storage agent of the present invention is five times or more that of water in terms of volume, and is characterized in that it is effective in light weight and small volume.

The resin container containing the latent heat storage agent used in the present invention is a high-temperature heat-resistant resin molded product such as syndiotactic polystyrene compatible with a high temperature range or a crystalline olefin polymer containing 4-methylpenten-1 as a main raw material. It is characterized by being a material that can sufficiently withstand weighting, pressurization, and high temperature. Further, a polypropylene resin may be used for measures other than the high temperature range.

The resin container with a built-in latent heat storage agent according to the present invention is characterized in that it is coated with a foamed ceramic heat insulating paint and covered with a heat insulating agent such as a melamine resin foam to maintain heat retention without adopting a vacuum method.

As a method of keeping the electric kettle warm, by energizing the electric heater at the bottom of the electric kettle, the water in the electric kettle is heated until it boils, and when the set temperature is reached, the power is turned off to supply hot water. doing.

In the above case, the temperature of the hot water in the electric kettle drops at once as soon as the power is turned off, and when it comes into contact with the outside air from the hot water supply port, the temperature inside the electric kettle drops further, and if it is used frequently. , It is not suitable for use as hot water unless the power is turned on again and heated.

In order to prevent the above-mentioned temperature drop, an air insulation layer or a vacuum layer is provided around the electric kettle, or the temperature control switch is repeatedly turned on and off to maintain an appropriate temperature.

In order to have the above-mentioned temperature control function, the structure and measures for controlling the electric kettle are added, so that the price of the electric kettle becomes high, and it is necessary to always energize the electric kettle, resulting in an increase in electricity consumption.

In the present invention, a high temperature resin container filled with a latent heat storage agent is inserted so as to be in contact with the peripheral portion and the bottom of the inner wall of the electric kettle, and when the heater of the electric kettle is turned on, the water in the kettle is heated and at the same time latent heat is generated. The heat storage agent is also heated. When the water reaches 95 ° C. or 100 ° C., the filled latent heat storage agent changes from a solid phase to a liquid phase, and when the kettle is turned off, the latent heat storage agent changes from a liquid to a solid and releases heat. This solid phase conversion makes it possible to maintain the temperature at a high temperature for a long time.

In the present invention, it is possible to keep heat quickly and always when necessary, so that a safe and lightweight heat retention system can be ensured.

Means to solve the problem

Electric kettles that do not have a heat insulation system are sold in the market, and at present, one or more electric kettles are widely used in each household because of their simplicity and low cost.

However, in actual use, the temperature of the hot water is maintained when the hot water is supplied after energization, but when the hot water is supplied again after that, the temperature of the hot water drops sharply, and it is necessary to turn on the power to heat it. ..

Conventionally, there is no latent heat storage agent with a built-in latent heat storage agent in the electric kettle. By heating the latent heat storage agent, heat (latent heat) is stored when changing from solid to liquid, and from liquid by cooling. It keeps warm by utilizing the phenomenon of melting and solidification that releases heat (latent heat) when it changes to a solid.

The invention's effect

According to the present invention, by setting an inner container having a latent heat storage agent built in the peripheral portion and the bottom of the inner wall of the electric kettle, it is possible to maintain the temperature at around 90 ° C. for a long time without turning on the electric heater having the electric kettle. At the same time as keeping warm, it is possible to keep hot water light and safe.

As described above, heat can be maintained without turning on the power, so that the amount of power consumption can be reduced.

The above-mentioned latent heat storage agent is a latent heat storage agent containing alum as a main component and a latent heat storage agent containing erythritol or mannitol as a main component, which is a material derived from food and is non-toxic and flame-retardant in terms of safety.

The latent heat storage agent used in the present invention can be used at least 2000 times or more, which is economically advantageous and has a small environmental load even when it is discarded.

Overall front view of the electric kettle Internal structure of electric kettle Cross-sectional view of a container set with a built-in latent heat storage agent in an electric kettle

1a of [FIG. 1] of the present invention is a main body of an electric kettle, which includes a lid portion 1b, a spout 1c, a handle 1d, a switch 1e, a water amount remaining window 1f, a main body bottom portion 1g, a main body pedestal 1h, and a power supply convex contact 1k. It consists of a power cord 1j, a power connector 1i, and hot water 1m.

FIG. 2 is a cross-sectional view showing the internal structure of an electric kettle. To show a normal usage example and procedure, water is put into the tank of the electric kettle, and when the main body is placed on the main body cradle, the power supply convex contact 1k and the power supply connection fitting portion 2c on the main body side are fitted. When the switch 1e is turned on, the electric kettle uses the built-in electric heater 2a to heat the heated metal plate 2b set in contact with the electric heater in advance, and the water boils. When the water boils and becomes hot water, the heat sensing sensor 2d set in the inner bottom of the electric kettle detects the boiling state, the power switch 1e is automatically turned off, and the heating of the electric kettle ends.

FIG. 3 is a cross-sectional view of a container set with a latent heat storage agent built into an electric kettle. The structure set in is shown. 3g indicates a tank containing hot water. The high heat resistant resin container 3a is set so that the bottom surface is in close contact with the heated metal plate 2b, and when the electric heater 2a is heated, the metal heating plate 2b is also overheated and the bottom of the high heat resistant resin 3a is also heated at the same time. As a result, the latent heat storage agent 3e is heated, and the portion of the latent heat storage agent material located at a higher position is heated by the heat conduction of the built-in thin aluminum plate 3b. Since not only the bottom portion but also the side portion of the high temperature resin container is heated, the filled latent heat storage agent 3e can efficiently perform solid phase conversion. A foamed ceramic heat insulating material 3f is coated on the outside around the heated heat-resistant resin container 3a, which makes it difficult for heat to escape to the exterior 3c of the electric kettle, so that the latent heat storage agent 3e is contained. The highly heat-resistant resin container 3a has a structure that does not easily cool. Furthermore, there is also a space 3d between the outside of the main body and the high-temperature heat-resistant resin container between the high-heat-resistant resin container 3a and the exterior 3c, and by filling this space with a heat insulating material, a higher heat-retaining effect can be obtained. ..

The latent heat storage agent 3e is a latent heat storage agent containing myoban as a main component at 80 ° C. to 95 ° C., a latent heat storage agent containing erythritol as a main component or a latent heat storage agent containing mannitol as a main component, and erythritol and mannitol at 100 ° C. or higher. Fill with a heat storage agent containing a mixture as the main component. Since the temperature is set to be higher than the boiling temperature of water, after the power is turned off, heat can be dissipated at a temperature higher than the boiling temperature of water during solid phase conversion from liquid to solid, and heat retention can be maintained for a long period of time. can.

The filling of the heat storage agent can be easily performed by setting the pressure to negative pressure. Further, since a reinforcing bridge can be inserted in the highly heat-resistant resin container 3a, a structure that can sufficiently withstand pressure fluctuations can be formed. The thin aluminum plate 3b may be an aluminum plate having a punched hole.

Possibility of industrial use

According to the present invention, when the electric kettle is turned on, not only water but also the heat storage agent is heated at the same time, so that the temperature can be maintained for a longer period of time.

Since the latent heat storage agent of the present invention is derived from food and is nontoxic and nonflammable, it can be safely used in general households and medical use, and has a small burden on environmental problems even in an accident such as disposal or leakage. ..

The built-in container 3a of the present invention is a high-temperature heat-resistant resin molded product such as syndiotactic polystyrene or a crystalline olefin polymer containing 4-methylpenten-1 as a main raw material, and has an allowable range in the operating heating temperature range. Safety can be ensured because it is a large material that can sufficiently withstand loads, pressurization, and high temperatures.

1a ・ ・ Electric kettle body upper part 1b ・ ・ Lid part 1c ・ ・ Spout 1d ・ ・ Handle 1e ・ ・ Power switch 1f ・ ・ Water amount confirmation window 1g ・ ・ Main body bottom 1h ・ ・ Main body cradle 1i ・ ・ Power connector 1j ・・ Power cord 1k ・ ・ Power convex contact 1m ・ ・ Hot water 2a ・ ・ Built-in electric heater 2b ・ ・ Heating metal plate 2c ・ ・ Concave power contact fitting part 2d ・ ・ Heat sensing sensor 3a ・ ・ High heat resistant resin container 3b ・ ・ Thin Aluminum plate 3c ... Exterior 3d ... Space between the outside of the main body and the high-temperature heat-resistant resin container (filled with heat insulating agent)
3e ... Latent heat storage agent 3f ... Foamed ceramic heat insulating paint 3g ... Hot water tank

Claims (2)

An electric kettle and a method for manufacturing the electric kettle, which is provided with a container containing a latent heat storage agent and a metal so as to be in contact with the peripheral portion and the bottom of the inner wall, and maintains a heat retention effect for a long time by the latent heat storage agent. In addition to claim 1, by applying a foamed ceramic heat insulating paint to the outer peripheral surface of the resin container containing the latent heat storage agent and further covering it with a heat insulating agent such as a melamine resin foam, heat retention is performed without using a vacuum method. An electric kettle and a method for manufacturing the electric kettle, which is characterized in that the state can be maintained.

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