JPS63135111A - Vacuum electronic heat insulating pot - 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 vacuum type electric heating pot for use in general households.

(Prior art) This type of conventional vacuum type electric heating pot was developed in 1987-
As disclosed in Japanese Patent No. 166840, a metal inner container and an outer container form a vacuum double container having a vacuum space, and a lid part with a built-in known bellows type air pump in the upper part of the vacuum double container. and an inner stopper located below the pump and equipped with a liquid lift pipe, a discharge pipe, and an air injection pipe is installed in close contact with the upper part of the container. The single bottom part that does not form a vacuum insulation space is made of an integral metal plate, and a band-shaped heating element is attached to the outer periphery of the single bottom part.

In addition, the liquid level display device had a transparent display pipe on one side of the container that communicated with the inside of the container, and a protective cover was installed from the outside to protect the entire display pipe. .

(Problems to be Solved by the Invention) Generally, when performing insulation using a vacuum space, a high degree of vacuum of 10-'Torr or more is required, but in the above conventional configuration, the inner container and the outer container Even if the leakage at the container joint is completely eliminated, the degree of vacuum will gradually decrease.

There was a problem that the insulation effect was weakened.

This is because even if consideration is given to carefully selecting the container material and making the vacuum holding surface smooth, hydrogen gas and air will gradually come out from the minute irregularities inside the material and on the surface.

For this reason, there are cases where a getter or the like is sealed in the vacuum layer of the container, and the getter or the like absorbs the generated gas to maintain the vacuum.

Further, the getter generally has a cylindrical shape and is porous.

For this reason, the getter cannot be directly attached to the wall of the container in the vacuum space by spot welding or the like, and it is held using an open auxiliary fitting.

In this case, metal fittings are required for attaching the getter, and minute holes are often formed in the spot welds, which may cause vacuum deterioration.

Furthermore, in order to make the getter work, it is necessary to raise the temperature to a high temperature to destroy the oxide film on the getter surface and activate it to absorb gas. Heat to 100°C.

Therefore, in order to withstand such high temperatures, the auxiliary fittings require expensive high temperature heat resistant materials.

However, even with these considerations, the auxiliary metal fittings were annealed, resulting in insufficient retention of the getter, and when the container was moved, the getter produced a rattling sound, which was an inconvenience.

The present invention solves these problems by supporting the getter without using any auxiliary fittings, and by constantly increasing the activity of the getter even while the pot is in use, and maintaining a high vacuum at all times. The purpose is to provide a vacuum-type electric heating pot that can be heated.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides heating of the inner container to the outer surface of the inner container in the vacuum space between the inner container and the outer container that constitute the vacuum double container. In addition, a plurality of groove-like ribs are provided in the cylindrical portion of the outer container.

Therefore, a wire-shaped ring-shaped getter is attached to the groove-shaped rib near the heater by utilizing its own spring property, and the getter is reliably supported with a simple structure.
While the pot is in use, the getter is constantly activated by the heater.

(Function) According to the above configuration, since the getter is supported by the grooved ribs necessary for the container configuration, cost reduction is achieved, and
Container yield during manufacturing also improves.

Furthermore, when the heater is energized, i.e., when a vacuum electric heating pot is used, the radiant heat of the heater activates the getter, which not only further improves the degree of vacuum at the time the pot was manufactured, but also targets that have deteriorated due to gas absorption. The gas generated from the container wall is constantly restored, and the gas generated from the container wall is reabsorbed extremely efficiently, allowing the desired insulation effect to be maintained indefinitely.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, 1 is a vacuum double container, and this vacuum double container 1
connects the inner container 4 and outer container 5 with the upper container 2 and lower container 3,
The vacuum space 6 between these is subjected to vacuum treatment.

The members constituting this vacuum double container 1 are fixed by the method i, in which base materials such as 18-8 stainless steel plates, which have low thermal conductivity among metals, are welded together, and the entire structure is shaped like a cylinder with a bottom. has been done.

Further, a sheathed heater 9 is wrapped around an exceptional surface near the bottom of the inner container 4 of the vacuum double container 1 and soldered by a method such as brazing.

Both terminal portions 12 of the sheathed heater 9 penetrate the lower container 3, and are taken out downward with the periphery sealed.

On the other hand, an outlet pipe 14 is provided at the bottom of the inner container 4, passing through the lower container 3 and having a sealed periphery.

A liquid lift pipe 16 is connected to the outlet pipe 14, and a liquid volume display pipe 17 made of a transparent material is connected vertically to the liquid volume display pipe 16.
An upper discharge pipe 18 is connected to the upper discharge pipe 18.

On the other hand, in order to facilitate the accommodation of the liquid 10 and the cleaning of the inner container 4, the upper opening 8 of the vacuum double container 1 has a diameter of at least 80 mm or more so that cleaning tools or hands can easily enter, and A vacuum space 6 extends from the upper part of the vacuum double container 1.

The vacuum double container 1 configured in this manner includes an upper body 19, a cylindrical side body 20, a lower body 21, and a back plate 2.
2 and a display frame 23, and is held via a mounting bracket 24 and a gasket 25.

A transparent cover 26 is fitted to a part of the display frame 23 at a position facing the liquid amount display vibrator 17,
The liquid 10 is displayed at the liquid level display pipe 17 through this cover 26.
A portion of the information can be confirmed from the outside.

Further, the upper opening 8 is provided with a bowl-shaped lid cover 29 that is fixed to the lower cover 28 of the lid 27 that is engaged with the upper body 19. This lid cover 29 and the lower cover 28
A heat insulating layer 30 is formed in the space between.

The lid cover 29 is fitted into the opening 8 so as not to hit the opening 8 when the lid 27 is opened using the pin 31 as a rotational fulcrum, and the tip of the lid cover 29 is designed to make the heat insulating layer 30 as thick as possible. It is made to hang down slightly toward the inner container 4 side.

Further, in the center of the lid cover 29 is an air inlet pipe 33 that connects to the space inside the inner container 4, and this air inlet pipe 33 communicates with a bellows type air pump 32.

13 is a thermostat provided approximately at the center of the bottom of the inner container 4, which detects and controls the temperature of the liquid 10.

Since the vacuum double container 1 is subjected to a pressure of IKg/cm2, the outer container 5, which is subjected to compressive force, needs to be particularly strong. Therefore, in order to make the container lighter, the outer container 5 is made of a thin plate, and its cylindrical portion 11 is provided with a plurality of concentric groove-like ribs 7.

Among these grooved ribs 7, a wire-shaped ring-shaped getter 15 is attached to the inner side of the grooved rib 7 near the sheathed heater 9 using its own springiness.

Generally, to manufacture this type of metal vacuum double container, a getter is fixed to some of the container components, each component is finished airtight by TIG welding, etc., and then this is placed in a vacuum furnace. Perform vacuum evacuation treatment.

Therefore, when the degree of vacuum reaches about 10-'Torr, the furnace is heated to expel the adsorbed gas from the surface of the container components and the container sealing part is brazed.After this is completed, the furnace is cooled. Air is returned to the furnace from

The container taken out from the furnace is placed in the high-frequency heating device again, and heated to a high temperature centering on the enclosed getter. While being careful not to melt the sealing solder, the getter is activated and heated to 10-'Torr or more. Achieve a high vacuum.

Since the present invention is configured in this manner, no special metal fittings are required to hold the getter 15, and the groove-like ribs necessary for the structure of the outer container 5 are skillfully utilized, making it inexpensive and free of inconveniences in use. do not have.

Moreover, each time the getter 15 is used, the sheathed heater 9
The high vacuum is maintained for many years by absorbing hydrogen gas etc. generated in the vacuum space 6, and there is no deterioration of the insulation effect.

Further, the getter 15 is not limited to a wire shape, but may be a sheet metal shape, and it goes without saying that the same effect can be achieved as long as it can be attached to the grooved rib 7.

(Effects of the Invention) As explained above, according to the present invention, the getter is simply fitted into the grooved rib of the outer container without using any auxiliary supporting metal fittings, so there is no need for spot welding or the like for installation. , cost reduction was achieved. In addition, the yield during container manufacturing also improved.

Furthermore, since the getter is placed near the heating element such as a sheathed heater fixed to the outer surface of the inner container of the vacuum double container,
By using a pot, the getter is activated, and the degree of vacuum does not deteriorate, resulting in a practical effect.

[Brief explanation of the drawing]

The figure is a sectional view of a vacuum electric heat-retaining pot showing an embodiment of the present invention. 1...Vacuum double container, 4...Inner container, 5...
- Outer container, 7... Grooved rib, 9... Sheathed heater, 11... Cylindrical part, 12... Both terminal parts, 14... Leading pipe, 15... Getter. Patent applicant: Matsushita Electric Industrial Co., Ltd. 1, J, Eni Ko δ No. 2-Upper container 31. ．． Osamu Shitaya 4. -Inner container 51. , outer container 6, -
Vacuum space 7-Groove lip 8, -9 Soil-shaped recess 9-' No-in heater 10, -Liquid-I main 11-Cylindrical part +2-Jlj/Ill child part +3
-, Lee Mosque, 14-, 4 pipes 15-0γ°,
, Tar 16 - Sweeping pipe 17 - Fluid quantity honomia 18 , , Discharging pipe 19 ,
,,Tsuchibote'-Otsu 11.狽It! I button °-21,-
Lower bottom °-22-6l & 23-tuRn24-,
! Also, clasp L 25, knob 2
6-j) One sword 0 with l. ．． 128. ,, lower it' knee
29-, XtJl'nee 30. -2ITfi layer 31
4. 32, - 7 claws. 33, -attention

Claims (1)

[Claims] A vacuum double container formed of a metal inner container and an outer container,
A sheathed heater is fixed near the bottom of the outside of the inner container, and both terminals of this sheathed heater are fixed to the outside of the inner container near the bottom. The cylindrical portion of the outer container is provided with a plurality of groove-like ribs, and one of the groove-like ribs is attached to the sheathed heater. A vacuum-type electric heat-retaining pot featuring a wire-shaped ring-shaped getter attached using its spring properties.