JPS61279090A - Heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating device equipped with a heating element such as a hot plate or iron. We have added functions to improve the heating characteristics by preventing rapid cooling of the heating surface during use, or we have made it cordless so that it can be disconnected from the power source for a certain period of time, making it easier to use. Attempts have been made to improve this.In order to add a heat storage effect, this type of heating device increases the weight of the heating base to increase the heat mass due to specific heat, and is equipped with a heat storage material that has latent heat at a constant temperature. is normal.

The heat storage material used in these heating devices is 150
It is necessary to be able to store and release heat within a temperature range of ~250°C, and to be particularly safe because the environment in which it is used is often in the home. However, there are only a few types of heat storage materials that satisfy this condition. The only known method is one that utilizes the latent heat of crystal transition of pentaerythritol, as shown in Japanese Patent Publication No.

Problems to be Solved by the Invention - However, for example, in a heating device that uses a low melting point metal as a heat storage material, it is difficult to seal it because it inevitably melts and liquefies during heat storage, and the metal that makes up the base There were also problems such as electrolytic corrosion due to contact with metals and diffusion of metals. In addition, when using pentaerythritol as a heat storage material, since pentaerythritol is originally an organic substance, it does not have sufficient heat resistance, and if used for a long period of time, it may deteriorate and fail to achieve its purpose. It is necessary to set a strict upper limit temperature for use, and it is not possible to constantly use the material at high temperatures exceeding the heat storage temperature.0 Also, with these heat storage materials that utilize latent heat during melting or crystal transition, the heat storage and release temperature is Since it is determined by the melting point and crystal transition point, the temperature range in which it can be used effectively is narrow.
For example, in products such as irons that need to be able to be used in a wide temperature range depending on the fabric, it has been difficult to effectively cover the entire operating temperature range.

The present invention addresses these problems, and aims to provide a heating device that can suppress the temperature drop of the base over a wide temperature range, improve heating characteristics, and provide cord laces. shall be.

Means for Solving the Problems The present invention has been made in view of the above problems, and includes a heating element embedded in a heat storage material that absorbs and radiates heat through crystal transition of anhydrous sodium sulfate, and has a heating surface. The base and the heat storage material are integrally provided.

The heat storage material used in the present invention utilizes the crystal transition (endothermic transition from an orthorhombic form to a single crystal form) of IJium (anhydrous sulfuric acid), and anhydrous sodium sulfate alone has a transition point of about 250°C. It has a latent heat of transition of about 6o1/y- and a high melting point of 884°C, so it is very stable at temperatures below this, and at the same time it is not corrosive to metals and has small volume changes. Since it is used as a medicine and bath additive, there is no safety problem even if it comes into contact with the human body.

In the present invention, a heating element is embedded in a heat storage material using anhydrous sodium sulfate as a heat storage material, and a base having a heating surface and the heat storage material are integrally provided. The base is heated from within, and the heated heat storage material heats the base. In fact, a temperature gradient occurs between the heating element and the base, and the heat storage material is always heated to a temperature higher than the base temperature. In other words, even if the base temperature is low, the heat storage material can be heated to a much higher temperature. Therefore, even when the temperature controller is used to set the υ pace temperature lower than the heat storage temperature (transition point) of the heat storage material, the heat storage material can sufficiently reach the heat storage temperature and can be stored as latent heat inside.

The present inventors also added Li to anhydrous sodium sulfate.

Na, K, Rb, Cs,, Mg, Ca
, a compound of Ba and F+ C1rBr, I, i.e., LiF, L'i(J/.

LiBr, LiI, NaF, NaC7, N
aBr, NaI, D”.

KC//, KBr, KI, RbF, R
bC5, RbBr, RbI.

CsF, CsC1, CsBr, Csl, M
gF2. MgC (12゜MgBr2.1v1gI,
, CaF2. CaCj'2. CaBr2. CaI
2゜BaF2r BaCl2. BaBx2y BaI
By mixing at least one type of 2 and causing them to coexist by heating and melting, the transition temperature can be lowered without almost eliminating the latent heat of crystal transition inherent in anhydrous sodium sulfate, and the transition temperature is It has been found that the temperature can be set arbitrarily in the range of 150 to 260°C depending on the amount of the above compound mixed.

Therefore, the shape and size of the heat storage material, base, heating element,
Alternatively, by setting the heat storage temperature according to the temperature gradient between the base and the heating element determined by the capacity of the heating element, etc., the heating device can effectively use the heat storage material over a wide operating temperature range and suppress the temperature drop of the base. design becomes easier.

EXAMPLES Below, examples of the present invention will be explained based on the accompanying drawings.0 Figure 1 shows an example in which the heating device of the present invention is applied to an iron. and Li, Na, K, and Pb.

Mg, Ca, Ba and F, Cl, Bz
, I is a heat storage material made by mixing at least one type of compound with I and making them coexist by heating and melting. The transition start temperature of anhydrous sodium sulfate, that is, the heat storage temperature, can be changed as shown in the graph of FIG. 2 according to the amount of addition. In this embodiment, a heat storage material 1 in which 10 molti of KCg is added to anhydrous sodium sulfate and the heat storage temperature is set to about 200'C will be explained. Reference numeral 2 denotes a base made of aluminum casting, and has a storage chamber 4 formed on its upper surface for accommodating a heat storage material 1 in which a heat generating element 3 such as a sheathed heater is embedded. Reference numeral 5 denotes a pace upper member integrally provided with a vaporization chamber 6 on the upper surface. This base upper member 5 is attached to the upper part of the storage chamber 4, and o7, which is in contact with the heat storage material 1 and covers the storage chamber 4, is a vaporization chamber. The lid covers the upper part of the vaporization chamber 6. An exploded perspective view of this part is shown in FIG. 3. 08 is the tank 9.
This drip nozzle supplies water stored in the vaporizer chamber 6 to the vaporizer chamber 6, and is connected to the vaporizer chamber 6 via a backing 10 attached to the vaporizer chamber lid 7. Reference numeral 11 denotes an opening/closing frame that interlocks with the steam button 13 provided at the top of the handle 12;
1 controls the water supply from the dripping nozzle 8 by moving up and down. 1
4 is a steam outlet provided on the bottom of the base 2, and air 4E is
, communicates with the chamber 6 through a steam passage 16, and blows out the steam generated in the vaporization chamber 6. A power supply terminal 16 is electrically connected to the heating element 3 via a temperature controller (not shown), and is connected to a power source to supply power. A temperature control lever 17 is connected to a temperature control device and is used to set the temperature of the base 2.

The operation of the iron configured as described above will be explained below.0 When a power supply is connected to the power supply terminal 16 and electricity is applied, the heating element 3 embedded in the heat storage material 1 generates heat, and the heat storage material 1 is first heated. , the base 2 is heated as the temperature rises. At this time, a temperature gradient occurs between the heating element 3 and the base 2, and for example, even if the temperature of the base 2 is 180°C, the temperature reaches 250'C or more in the heat storage material 10 near the heating element 3. Therefore, most of the heat storage material 1 rises to the heat storage temperature of 200° C., undergoes crystal transition, and stores heat as latent heat while remaining in a solid state. Further, even if the temperature near the heating element 3 of the heat storage material 1 rises considerably, the melting points of anhydrous sodium sulfate, KC, and 5 are 750'C or more, so they will not melt and liquefy during normal use. The stored heat storage material 1 then starts dissipating heat when the power source is disconnected from the power supply terminal 16, and the heat is transmitted to the base 2 and base upper member 6, suppressing the temperature drop of the heating surface 2A of the base 2 and the vaporization chamber 6. do. This situation is shown in the temperature characteristic diagram of FIG. This figure shows the heating surface 2 of the base 2 when it is left alone after energizing the power supply terminal 16.
A and temperature changes in the vicinity of the heating element 3 of the heat storage material 1 are shown.

In this manner, by energizing the power supply terminal 16, even if the temperature setting of the base 2 is lower than the heat storage temperature of the heat storage material 1, the heat storage material 1 reaches the heat storage temperature and stores heat.

Therefore, even if the power supply is disconnected after that, the temperature drop of the base 2 is suppressed by the heat dissipation of the heat storage material 1, and ironing can be done without a power supply.As a result, the power cord may get caught on clothing, or The operating range is not limited, and the operability of press work can be improved. In addition, when generating steam, operate the steam button 13 to open the opening/closing frame 11, and the drip nozzle 8
Water is supplied from the backing 1o to the vaporization chamber 6,
The steam generated here is ejected from the steam ejection hole 14 via the steam passage 16. At this time, a large amount of heat is taken away from the vaporization chamber 6, but due to the heat radiation of the heat storage material 1, stable steam can be obtained for a long time without a sudden temperature drop.

FIG. 6 shows another embodiment of the present invention.
In the figure, a heat storage material 1, a heating element 3. Vaporizing chamber lid 7° Dripping nozzle 8
．． Tank 9. Backing 10. Opening/closing frame 112 handle 12.
Steam button 13. Steam outlet 14. Power supply terminal 1
6. Temperature adjustment/<-17 is the same as the embodiment shown in Fig. 1.0 In the embodiment shown in Fig. 5, the heat storage material 1 in which the heating element 3 is embedded in advance is inserted into the base 2' when aluminum is cast. Similar to the embodiment shown in FIG.
A steam passage 15' is formed to communicate with the steam passage 15'.

This type of insert molding is possible because the melting point of the heat storage material 1 is higher than that of aluminum, as described above, and this ensures reliable contact between the heat storage material 1 and the base 2'.
Heat conduction can be improved, and the number of parts can be reduced, leading to a reduction in manufacturing costs.

Although the above embodiment describes the case where the heating device of the present invention is applied to an iron, for example, if it is applied to a hot plate, it is possible to improve the temperature distribution at each set temperature on the heating surface. In addition, it can be applied to heating devices such as electric pots, thermal food, deep fryers, electric pots, etc., to improve heating characteristics and usability by making them cordless.In addition, in this example, the heating element is embedded 1 mm into the heat storage material. Although it does not describe the manufacturing method, there are other methods, such as pouring molten heat storage material into a mold and molding the heating element, or press-molding heat storage material powder around the heating element, etc. It is sufficient to bury the heat storage material so that the heat storage material is in contact with the heating element.

Furthermore, the heat storage material of this example was prepared by adding KC to anhydrous sodium sulfate.
However, depending on the operating temperature range of the heating device, it is also possible to use anhydrous sodium sulfate alone without mixing any compounds and use it at a transition temperature of 250' (: The transition temperature may be set at 180°C by adding 6.7 mol% of K (4) and 1.3 mol of CaCl2 to sodium sulfate;
, Na, Rb, Cs.

Two or more types of compounds of Mg, Ca, Ba and F, (4, Br, I) may be added.

Effects of the Invention As described above, according to the present invention, a heating element is embedded in a heat storage material that absorbs and radiates heat through crystal transition of anhydrous sodium sulfate, and a base having a heating surface and the heat storage material are integrally provided. Therefore, heat can be stored in the heat storage material even if the set temperature of the base is lower than the heat storage temperature of the heat storage material, and the temperature drop of the base is suppressed over a wide temperature range by using the latent heat of crystal transition of anhydrous sodium sulfate. With this, it is possible to realize a heating device such as a hot plate, iron, etc., which has improved heating characteristics and is cordless, thereby improving usability.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing an example in which the heating device of the present invention is applied to an iron, Fig. 2 is a characteristic diagram showing changes in the transition start temperature due to changes in the composition of the heat storage material, and Fig. 3 is the same diagram. FIG. 4 is a characteristic diagram showing temperature changes near the heating surface of the iron and the heating element of the heat storage material, and FIG. 5 shows another embodiment in which the heating device of the present invention is applied to an iron. FIG. 3 is a partially cutaway side view. 1... Heat storage material, 2, 2'... Base, 2A. 2A'...Heating surface, 3...Heating element. Name of agent: Patent attorney Toshio Nakao and 1 other person3--
- KtL 4--- F! , bCJ- 5---N0L2SO+Tough Figure 3
10 minutes slow - miracle (minute 2

Claims (3)

[Claims] (1) A heating device in which a heating element is embedded in a heat storage material that absorbs and radiates heat through crystal transition of anhydrous sodium sulfate, and a base having a heating surface and the heat storage material are integrally provided. (2) The heat storage material is anhydrous sodium sulfate containing Li, Na, K,
The heating device according to claim 1, wherein at least one compound of Rb, Cs, Mg, Ca, Ba and F, Cl, Br, I is mixed and made to coexist by heating and melting. (3) The heating device according to claim 1 or 2, wherein the heat storage material in which the heating element is embedded and molded is embedded during molding of the base by aluminum casting.