JPS5936527B2 - electric water heater warmer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an airtight container with a double wall such as a thermos flask.
An evaporative heat medium is sealed in a deaerated cavity between the outer and inner walls of a closed container, and a part of the closed container is heated to take advantage of the phase change caused by the evaporation and condensation of the heat transfer medium. Regarding electric water heaters that heat the water inside and keep it warm,
In particular, it relates to improvements in its structure.

Conventionally, in closed containers made of glass, ceramic, etc., which have a double structure, a heating medium is sealed in the sealed cavity, and a part of the heat medium is heated to heat and insulate the liquid in the container. Due to the impact, the container body made of glass, ceramic, etc. may be damaged and the hot water inside the container may leak out of the container, causing burns.Also, there is a risk of electric shock due to electrical parts being impregnated with hot water, resulting in poor electrical insulation. There were some drawbacks, such as:

The present invention improves the above-mentioned drawbacks.In the present invention, the outer wall of the double-walled container body is made of metal, and the inner wall is made of glass, ceramic, etc., so that even if the glass, ceramic, etc. of the inner wall is damaged, the inside of the container remains intact. Since the boiling water does not leak out of the container body, there is no risk of fire or electric shock due to poor electrical insulation of electrical parts, or there is no risk of burns caused by hot water leaking out of the container. There is little heating loss from the outside, and the container has strong corrosion resistance.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an electric water heater and heat insulator showing one embodiment of the present invention.

1 is a sealed double-structure container body, which is composed of an outer wall 2 made of metal such as stainless steel, copper, or aluminum, and an inner wall 3 made of glass or ceramic, etc.; It has a closed cavity 4.

This airtight cavity 4 is filled with an appropriate amount of an evaporative heat medium 5 such as alcohol, Freon, or water.
is collected at the heating part 6 of the bottomed annular protrusion at the bottom due to the action of gravity.

7 is an annular cylindrical heating device provided in close contact with the outer periphery of the heating section, and 8 is an annular retaining ring for fixing the heating device 7.

9 is a container case, 9' is an upper stopper of the container body 1, 10
is a liquid such as hot water in the container body 1.

11 is a heat insulating material such as hard urethane, glass wool, air, vacuum, etc. provided between the container body 1 and the container case 9.

Reference numeral 12 denotes a temperature detector such as a thermostat provided in close contact with the bottom of the outer wall 3 of the container body, which detects the temperature of the liquid 10 and controls the heating device 7.

13 is a case of the temperature sensor 12, 14 is a top lid, 1
Reference numeral 5 denotes a pressure pump for taking out the liquid 10 in the container to the outside through a discharge pipe 16.

Reference numeral 17 denotes a threaded plate provided on the inner periphery of the bottom of the container case 9, and 18, the lower receiver of the container body 1 is fixed to the threaded plate 17 by screwing the body.

19 is a bottom plate screwed to the bottom of the container case 9, and 19' is a plurality of small holes drilled in the bottom plate 19.

20 is a plug receiver provided on the bottom side wall of the container case 9.

Next, the above operation will be explained.

When the heat medium 5 is heated by the heating device 7, the heat medium 5 absorbs heat as latent heat and evaporates to become steam, and the steam quickly moves into the cavity 4 due to the pressure difference.

Then, it condenses on the outer wall 2 and inner wall 3, which are lower temperature than the heating section 6, and releases heat.

In this case, it mainly condenses on the inner wall 3.

The condensed heat medium 5 is returned to the heating section 6 by gravity.

By repeating the above cycle, the liquid 1 in the container body 1
0 heating and keeping warm.

At this time, the vapor temperature of the heat medium 5 in the container body 1 is almost equal to the temperature of the liquid 10 in the container, the temperature rise in the heating section 6 is small, and despite the small heating area, the heat generated in the heating device 7 is easily absorbed. The heat is transferred to the heat medium 5 and the liquid 10 in the container is quickly heated with almost no temperature difference.

Even if the inner wall 2 of the container body 1, which is made of glass, ceramic, etc., is damaged by accidentally dropping the warmer after heating the hot water electrically, the inner wall 2 is covered with the metal outer wall 2 according to the present invention. It can prevent the boiling water liquid 10 from flowing out in the container, and prevent hot water from soaking into electrical parts such as the heating device 7, temperature detector 12, and plug holder 20, resulting in poor electrical insulation, resulting in electric shock or fire. It is safe and there is no risk of getting burned.

In addition, since the heating device 7 directly heats the heat medium 5 in the metal heating section 6, there is little heat loss and high thermal efficiency.
The heating device can be a small-capacity heater.

Further, since the inner wall 3 is made of glass, ceramic, etc., there is no elution of metal into the liquid 10.

Moreover, it has strong corrosion resistance.

Moreover, since the metal outer wall 2 has a double structure that also serves as protection, the production cost is low.

FIG. 2 is a cross-sectional view of an electric water heater and heat insulator showing another embodiment of the present invention.

The bottom heating part 6' of the metal outer wall 2 of the container body 1 is made into a hemispherical shape, and the hemispherical heating device 7' is in close contact with the lower surface of the bottom heating part 6' and is supported by the heating device support 8'. The structure of the main body 1 is simple and manufacturing is easy.

The welded part 1' between the metal outer wall 2 and the glass or ceramic inner wall 3 has a slightly wider opening at the bottom, making it easier to manufacture.

It has the same effects as those mentioned above in terms of safety, thermal efficiency, etc.

In addition, a troll-shaped heating element (not shown) made of aluminum or the like with good thermal conductivity is brought into close contact with the lower surface of the bottom of the heating section 6', and a planar heating device (not shown) is further brought into close contact with the lower surface of the heating element. This makes manufacturing easier because the heating device has a planar shape.

FIG. 3 is a wiring diagram of an electric water heater and heat insulator showing an embodiment of the present invention, in which 7 is a heating device, 12 is a temperature detector such as a thermostat, 21 is a temperature fuse, 22 is a current fuse, and 23 is a power supply switch. It is an indicator lamp.

As is clear from the above description, the present invention achieves the following effects by integrating the outer wall of the double-walled container body with metal, the inner wall with glass, ceramic, etc., and providing a heating section at the bottom.

(1) Even if the inner wall of glass, ceramic, etc. is damaged, it is possible to prevent liquids such as boiling water from flowing out, so there is no risk of burns, fire, or electric shock, making it safe.

(2) Since the heating medium is heated directly from the heating section, there is little heat loss and the thermal efficiency is good, so a heater with a small capacity can be used as the heating device.

(3) Manufacturing costs are low because the metal outer wall doubles as protection.

(4) Even if the container body is damaged, it can be easily replaced, improving serviceability.

(5) Low power consumption due to good heat retention efficiency.

(6) It becomes easier to manufacture and assemble.

(Strength) Since the inner wall is glass or ceramic, there is no elution of metal into the liquid, and it is highly corrosion resistant.

(8) Can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an electric water heater and heat insulator showing one embodiment of the present invention, FIG. 2 is a sectional view of an electric water heater and heat insulator showing another embodiment of the present invention, and FIG. A wiring diagram of an electric water heater and heat insulator showing an example. 1...Container body, 2...Outer wall, 3...
...Inner wall, 4...Cavity, 5...Heating medium, 6,6'...Heating part, 7゜7'...
...Heating device, 10...Liquid.

Claims (1)

[Claims] 1. A heating medium is sealed in the deaerated cavity of a double-walled sealed container body that has heating and heat retention functions, and by heating a part of the sealed container, evaporation and condensation of the heating medium are prevented. In a container that uses phase change to heat and keep the liquid in the container body warm, the outer wall of the double-structured container body is made of metal, the inner wall is made of glass, ceramic, etc., and the bottom of the outer wall is heated. An electric water heater with the following features: