JPS6026477Y2 - Heating element of heated thermos bottle - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heating element for a heating thermos bottle.

[Conventional technology]

Conventionally, heated thermos bottles have a vacuum double inner bottle made of glass surrounded by an outer case, and a drainage member is attached to the mouth of the inner bottle via an annular gasket, while a heating element of a sheathed heater is installed to remove the heat generated. Either the body is suspended directly from the mouth of the medium bottle, and a thermostat that senses the temperature of the liquid in the medium bottle and controls the heating of the heating element is provided separately from the heat generating body, and both are suspended separately within the medium bottle. The thermostat was attached to the top of the heating element near the mouth of the inner bottle, but since the mouth of the inner bottle in this type of heating thermos bottle has a much smaller diameter than the body of the middle bottle, a separate sheath is hung from the mouth of the inner bottle. It is extremely difficult to install the heater and thermostat, and since a sheathed heater is used as the heating element, it is expensive.Moreover, the heating of the heating element is controlled by sensing the temperature near the mouth of the inner bottle. As a result, the temperature difference between the liquid near the bottom of the inner bottle and the liquid near the mouth of the inner bottle is markedly different, especially in thermos bottles that use air pressure and have a pumping pipe suspended into the inner bottle. However, there was a drawback that satisfactory heat retention conditions could not be obtained and the liquid inside the inner bottle would be sucked up at a low temperature.

In addition, the thermostat always senses the temperature near the mouth of the inner bottle, so even if the liquid in the inner bottle decreases during use and the liquid runs out, the heater will be energized and will not run dry to maintain the heating state. Next, there was a drawback that was extremely dangerous.

[Purpose of invention]

The present invention was developed in view of the above drawbacks, and it has an extremely simple structure and can be produced at low cost. It also eliminates temperature differences in the liquid inside the inner container, allowing the heated state to be maintained at all times, and can be used for a long period of time. To provide a heating element for a heating type thermos flask that can withstand long periods of time and is highly safe by preventing dry cooking.

[Structure of the idea]

According to the present invention, the heating element is suspended almost vertically toward the inner bottom of the inner bottle, and a hollow tubular body is provided that surrounds the heating part of the nichrome wire heater, and the upper end of the tubular body is connected to the heat-resistant and waterproof member for the tubular body. , the lower end is sealed with an insulator, and a cylindrical body is provided that covers the thermostat except for the sensing surface of the thermostat. The objective is to be distantly related only by the structure in which the annular waterproof comb is brought into close contact with the outer circumferential wall at the point of contact with the body.

[Example of idea]

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

The heating element 1 of the heating type thermos bottle A is suspended inside the inner bottle of the thermos bottle 6, which has a drainer member 5 attached to the inner bottle 30 surrounded by the outer case 2 via the annular gasket 4, and is connected to a nichrome wire heater. a heat generating part 7, a lead wire 8 which connects one end to the terminal of the heat generating part and the other end to an external power supply;
It is installed at the lower end of the heat generating part and detects the temperature of the liquid inside the inner bottle to heat the heat generating part. tatll thermostat 9, a cylindrical body 10 containing this thermostat, a hollow tubular body 12 surrounding the heating element, a heat-resistant waterproof member 15 for the tubular body that seals off the upper end of the tubular body, and a lower end of the tubular body that seals the tubular body. It is composed of an insulator 11 and an annular waterproof comb 13 surrounding the outer circumference of the lower end of the tubular body and the outer circumference of the upper end of the cylindrical body.

The heating element 1 is suspended almost vertically from the lower end of the draining member near the inner bottom of the inner bottle 3 to improve the convection of the liquid in the inner bottle and shorten the heating time. As shown in FIG. 3, the heating portion 7 of the heating element is a nichrome wire heater stretched along the longitudinal direction of the tubular body 12.

The tubular body 12 is formed into a hollow cylindrical shape from a material such as metal or heat-resistant insulator, and has a lead wire storage pipe 1 in the center.
6 is installed vertically.

The tubular body 12 has a disk-shaped heat-resistant and waterproof member 15 made of a heat-resistant insulator etc. fixed to its upper end via the heat-generating portion 7 and the space 14, and a disk-shaped insulator 11 is fixed to its lower end. The inside of the body is sealed.

A through hole is bored in the center of the disc-shaped heat-resistant waterproof member 15 for a tubular body, and a lead wire storage pipe 16 passes through this through hole.

The cylindrical body 10 is formed in a cylindrical shape from a heat-resistant and waterproof member, and covers the peripheral wall of the thermostat 9 except for the sensing bottom surface.

The outer diameter of this cylindrical body is equal to the outer diameter of the tubular body 12.

The thermostat 9 has one terminal connected to the heating part within the insulator 11 and the other terminal connected to the lead wire 8.
It is set so that when the temperature of the liquid in the inner bottle falls below 80°C, the heat generating part is turned on and electricity is applied to heat it, and when the liquid temperature approaches the boiling point, the heat generating part is turned on.

The annular waterproof rubber 13 is formed in an annular shape from a heat shielding material such as silicone resin or epoxy resin, and is located on the outer periphery of the lower end of the tubular body at the contact point between the tubular body 12 and the cylindrical body 10, and on the insulator 11.
The outer circumferential side and the outer circumferential side of the upper end of the cylindrical body 10 are sealed and fixed.

The lead wire 8 connected to the terminal of the heat generating part inside the tubular body is housed in a lead wire storage pipe 16, and one end of this lead wire storage pipe 16 is connected to the through hole in the center of the heat resistant waterproof member 15 for the tubular body at the upper end of the heat generating part. The other one passes through and is fixed through the draining member 5 of the magic pin main body 6.

Although the lead wire 8 is built in the lead wire storage pipe 16, it may be passed through the tubular heat-resistant waterproof member 15 and the draining member 5 as it is.

In the above embodiment, the upper end of the heating element is fixed to the draining member, but the upper end of the heating element is detachably attached to the upper end of the mouth of the inner bottle, and the heating element is suspended toward the inner bottom of the inner bottle. Good too.

[Effect of idea]

In this invention, a heating element made of a nichrome wire heater with a lead wire storage pipe arranged in the center is surrounded by a tubular body,
The upper end of the tubular body is sealed with a heat-resistant waterproof material for tubular bodies, the lower end is sealed with an insulator, and a cylindrical body is provided that covers the peripheral wall of the thermostat except for the sensing surface. Since the annular waterproof rubber is stretched on the outer circumferential wall of the abutment area, the structure and assembly are extremely simple and can be manufactured at low cost and easily.

In addition, the heating element is suspended almost vertically toward the inner bottom of the inner bottle, and the thermostat is installed directly below the heating element.
Even if the liquid in the inner bottle becomes less than the heat generating part, dry cooking can be prevented and safety is high, and the liquid in the inner bottle can always be heated without fail.

In other words, the liquid in the inner bottle is warmed by the heating of the heat generating part and rises vertically, causing a convection phenomenon in which the liquid in the upper cold part falls along the inner wall of the inner bottle. It senses the liquid and can maintain the liquid inside the bottle at a high temperature.

Furthermore, since the sensing surface of the thermostat is in direct contact with the liquid, the temperature of the liquid can be accurately detected.

Furthermore, the heat-generating part and the thermostat are completely separated via an insulator, and their outer peripheries are sealed and fixed with an annular waterproof comb, so the thermostat is not directly heated by the heat-generating part. Early deterioration of the thermostat can be prevented, and even if the thermostat becomes defective, the annular waterproof comb can be removed and the thermostat part can be dismantled and replaced extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a heating thermos flask incorporating the heating element of the invention, FIG. 2 is a perspective view of the heating element of the invention, and FIG. 3 is a longitudinal sectional view of the heating element of the invention. A: Heating thermos bottle, 1: Heating element, 2: Exterior case, 3: Inner bottle,
5... Draining member, 7... Heat generating part, 8...
...Lead wire, 9 ...Thermostat,
10... Cylindrical body, 11... Insulator,
12... Tubular body, 13... Annular waterproof rubber, 15... Heat resistant waterproof member for tubular body, 16...
...Lead wire storage pipe.

Claims (1)

[Scope of utility model registration request] A draining member is attached to the mouth of the inner bottle surrounded by the outer case through an annular gasket, and a heating element is installed inside the bottle, which is equipped with a heat generating part that heats the liquid and a thermostat that controls the heat generating part by sensing the temperature of the liquid. In a heated thermos bottle built into the bottle, the heating element is suspended almost vertically toward the inner bottom of the inner bottle, and a hollow tubular body surrounding the heat generating part of the nichrome wire heater is provided, and the upper end of the tubular body is The lower end is sealed with a heat-resistant waterproof material for tubular bodies, and the lower end is sealed with an insulator.A cylindrical body is provided that covers the thermostat except for the sensing surface of the thermostat, and the upper end of the cylindrical body is connected to the lower end of the tubular body through the insulator. A heating element for a thermos thermos flask, characterized in that an annular waterproof rubber is closely abutted on the outer circumferential wall of the abutment area between a tubular body and a cylindrical body.