JP2002110265A - Airtight vacuum terminal and electric pot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airtight vacuum terminal improved in impact resistance thereof and to be used for electric products and electric equipment easy to be carried and moved and easy to be damaged by falling and a colliding, and to provide an electric pot improved in impact resistance and energy efficiency when heating and keeping the temperature by using the improved airtight vacuum terminal. SOLUTION: A peripheral part of a peripheral conductor is connected to this airtight vacuum terminal through a metal frame-like impact absorbing member 41. The impact absorbing member 4a has a cylindrical part A connected to the peripheral part at the inner peripheral surface thereof, a folding part B formed by folding one end of the cylindrical part A on the way of the peripheral part at 1-5 mm of curvature radius, an inclined part C inclined so as to be spread outside from the folding part B, and a flange part D continued to the outside from the inclined part C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum hermetic terminal, and more particularly to a power supply and an electric signal transmission between parts installed inside and outside a vacuum double container such as an electric pot, electric equipment and various electric appliances. The present invention relates to a vacuum-tight terminal used for performing transmission and an electric pot using the terminal.

[0002]

2. Description of the Related Art Conventionally, in a physics and chemistry instrument having a vacuum double container such as an electron microscope, power supply and transmission of electric signals are performed between parts in the vacuum double container and various devices outside the vacuum double container. Vacuum-tight terminals are used to do this. The basic structure of the vacuum-tight terminal is shown in the sectional view of FIG. In FIG. 2, 1 is an insulator, 2 is a conductor pin, 3 is a metal sleeve as an outer conductor, 4 is a cap-shaped joining member, 5 and 6
Is a metal layer, and 7 is a metal washer, which mainly constitutes a vacuum-tight terminal.

In general, this vacuum-tight terminal is made of an insulator 1 made of a sintered body of aluminum oxide (Al ₂ O ₃ ), an insulator 1 having a through hole in the axial direction, and both ends inserted into the through hole. Conductor pin 2 made of a metal material such as oxygen-free copper (Cu) or iron (Fe) -nickel (Ni) -cobalt (Co) alloy, and at least one end face of insulator 1 and conductor pin 2 A metal washer 7 made of a brazed metal material such as an Fe-Ni-Co alloy; and a cylindrical member made of a metal material such as an Fe-Ni-Co alloy joined to the outer peripheral surface of the insulator 1 via a brazing material. And a metal sleeve 3.

The outer periphery of the cap-shaped joining member 4 is fixed to the through hole of the vacuum double container by welding or the like, and the components inside the vacuum double container and the power supply device outside the vacuum double container are connected to each other. By electrically connecting to both ends of the conductor pin 2 via a cable or the like, power can be supplied and electric signals can be transmitted between components and devices installed inside and outside the vacuum double container.

[0005] The metal washer 7 is brazed to the insulator 1 before the metal layer 5 having a two-layer structure of a metalized layer of molybdenum (Mo) -manganese (Mn) and a Ni plating layer is formed on the end face of the insulator 1. Is adhered, and the metal layer 5 and the metal washer 7 are joined via the plate-shaped brazing material 8.

[0006] Similarly to the metal washer 7, the metal sleeve 3 is brazed to the insulator 1 on the outer peripheral surface of the insulator 1 in advance to the extent necessary for bonding. A metal layer 6 having a two-layer structure is adhered, and the metal sleeve 3 is coated on the metal layer 6 with the linear brazing material 9.
It is performed by joining through a.

As a conventional example of such a vacuum-tight terminal,
A metal cylinder having a through hole hermetically joined to a through hole of an airtight container, a cylindrical ceramic insulator having a through hole inserted into the through hole of the metal cylinder, and a through hole of the ceramic insulator The conductor for energization provided with terminal portions at both ends, a cylindrical cap for hermetically joining the metal cylinder and the ceramic insulator on the side in contact with the outside air of the hermetic container, the ceramic insulator and the conductor for energization In a vacuum hermetic insulation terminal consisting of a cylindrical cap that is hermetically bonded, a thermosetting seal is provided in the gap between the current-carrying conductor and the ceramic insulator and the gap between the ceramic insulator and the metal cylinder that is bonded to the metal hermetic container. A cap is inserted between the current-carrying conductor and the ceramic insulator and between the ceramic insulator and the metal tube joined to the airtight container by injecting or inserting an insulator or the like to fix the current-carrying conductor. Min mechanical force has been proposed to have effects that do not concentrate (patent 2903
No. 976).

FIG. 6 is a cross-sectional view showing the basic structure of a conventional electric hot water storage container having a vacuum double container, in which water or the like heated by an electric heater 13 of a heating container 18 connected to the outside of the vacuum double container. This is a heating method in which the content liquid 17 is circulated through the connection passage 19 to the vacuum double container. This heating vessel 1
8 has a single structure capable of efficiently transmitting heat to the internal solution 17. Further, since the heating container 18 is smaller than the bottom area of the vacuum double container, it is hardly affected by the heat radiation due to the convection of the atmosphere. (Japanese Unexamined Patent Application Publication No. 2000-15741).
7 gazette).

[0009]

However, the above-mentioned conventional vacuum-tight terminals are used for physical and chemical instruments such as an electron microscope, and are hardly impacted after the equipment is installed. In various electric appliances and electric appliances such as an electric pot which can be easily moved, an impact due to an external force at the time of a drop or collision is likely to be applied.

For example, in the case of the vacuum hermetic terminal shown in FIG. 2, the metal sleeve 3 of the vacuum hermetic terminal is joined to a through hole provided in the outer wall of the vacuum double container via a cap-shaped joining member 4. In addition, the vacuum-tight terminal is tightly integrated with the vacuum double container. Then, the vacuum-tight terminal is almost directly subjected to the impact of external force such as dropping or collision, and cracks or cracks of the members themselves are generated at the joints of the members, and as a result, the vacuum in the vacuum double container is reduced. There was a problem that the terminal was broken at the vacuum-tight terminal portion.

[0011] Since various kinds of members are joined through a brazing material or the like after high-temperature treatment, the internal residual stress due to the difference in the coefficient of thermal expansion causes a tensile stress or a stress near each joint of the various members. It is considered that the compressive stress remains, and when an impact due to an external force such as a drop or a collision is applied to the vacuum-tight terminal having the internal residual stress, a crack or a crack of the member itself easily occurs at the joint of each member. Can be inferred.

For example, the thermal expansion coefficient of various members of the vacuum-tight terminal is about 20 × 10 ⁻⁶ / ° C. for oxygen-free copper for the conductor pins 2.
(Room temperature to 800 ° C.), about 8 × 10 ⁻⁶ / ° C. (room temperature to 800 ° C.) for the aluminum oxide sintered body for the insulator 1, and about 6 × for the Fe—Ni—Co alloy for the metal sleeve 3 and the like. 10 ^-6 /
° C (room temperature to 800 ° C). Therefore, when various members are subjected to high-temperature treatment and brazed, a large stress is generated in each member due to a difference in thermal expansion coefficient.
When the residual stress due to the heat is subjected to the impact of an external force such as dropping or collision, each joint is very fragile and easily cracks or cracks of the member itself. However, there was a problem that the wire was broken at the vacuum-tight terminal portion.

Further, the heating vessel 18 having the above-mentioned conventional structure is used.
In the electric hot water storage container having the vacuum double container provided with the above, since the portion for heating the inner solution is a separate heating container from the vacuum double container, the electric heater 13 attached to the heating container is exposed to the atmosphere. Basically, there has been a problem that heat at the time of heating is easily convected to the outside atmosphere side and easily radiated by radiation.

Regarding the heat radiation after heating the content liquid 17, the heating by the convection of the atmosphere when the electric heater 13 is not energized because the heating vessel 18 is provided separately at the bottom of the vacuum double vessel. There was a problem that the rate of heat radiation from the container 18 was high, and the heat retention effect was easily reduced.

The present invention has been completed in view of the above-mentioned problems in the prior art. An object of the present invention is to prevent an impact due to an external force such as a drop or a collision from being transmitted almost directly to a vacuum-tight terminal. It is an object of the present invention to provide a stable and highly reliable vacuum hermetic terminal which significantly suppresses the occurrence of cracks or the like in the joints of members due to impact or cracks in the members themselves. Another object of the present invention is to provide an electric pot with an improved energy saving effect by efficiently heating the content liquid and further increasing the heat retention.

[0016]

According to the present invention, there is provided a vacuum hermetic terminal comprising: a columnar insulator having a through hole formed in an axial direction; a conductor pin inserted and joined to the through hole; and an outer peripheral surface of the insulator. And a cylindrical outer conductor joined to the through hole, which is inserted into a through hole provided in the outer wall of the vacuum double container, and an outer peripheral portion of the outer conductor is connected to the through hole via a metal frame-shaped shock absorbing member. A vacuum-tight terminal joined to the shock-absorbing member, wherein the shock-absorbing member has a cylindrical portion having an inner peripheral surface joined to the outer peripheral portion, and one end of the cylindrical portion has a radius of curvature of 1 in the middle of the outer peripheral portion.
It is characterized by having a folded portion that is folded at about 5 mm, an inclined portion that is inclined so as to spread outward from the folded portion, and a flange portion that extends outward from the inclined portion.

According to the present invention, the vacuum double container equipped with the vacuum airtight terminal of the present invention has the above structure even if a large stress due to the difference in thermal expansion coefficient is generated at each joint of the vacuum airtight terminal. Even if an impact due to an external force such as a drop or a collision is applied, cracks or cracks of the members themselves are greatly suppressed at each joint, and a stable and highly reliable vacuum-tight terminal can be provided. Having.

In the present invention, the thickness of the shock absorbing member is preferably 0.3 to 1.5 mm.

With the above configuration, even if an impact due to an external force such as a drop or a collision is applied, the elastic deformation of the shock absorbing member itself is effectively used, and cracks and cracks of the member itself are formed at each joint of the vacuum-tight terminal. Greatly reduces the occurrence of
There is an operational effect that a stable and highly reliable vacuum hermetic terminal can be provided.

In the present invention, preferably, a distance in a direction perpendicular to the axial direction between an outer surface of the cylindrical portion and a surface of the bent portion at a boundary between the inclined portion and the flange portion on the outer surface of the cylindrical portion. Is 1 to 5 mm.

According to the above configuration, even when an impact due to an external force such as a drop or a collision is applied, a gap at least equal to the amplitude of the vibration of the outer conductor of the vacuum-tight terminal is secured, and the outer conductor and the outer surface of the cylindrical portion are vibrated. Can greatly suppress the occurrence of cracks or cracks in the members of the vacuum hermetic terminal due to contact with the inner surface of the inclined portion, thereby providing a stable and highly reliable vacuum hermetic terminal. Having.

The electric pot of the present invention has an inner side wall and an outer side wall formed at a substantially constant interval, and a space between the inner side wall and the outer side wall is hermetically sealed in a vacuum. A vacuum double container having a container formed by the inner wall and the outer wall, an electric heater provided on the inner wall of the vacuum double container, and airtightly connected by being inserted into a through hole formed in the outer wall. And an electric pot provided with a vacuum-tight terminal for supplying electric power to the electric heater, wherein the vacuum-tight terminal is the vacuum-tight terminal of the present invention.

With the above arrangement, when the internal solution is heated,
Heating can be performed with extremely high thermal efficiency by the electric heater provided on the inner side wall of the vacuum double container, and heat transfer to the content liquid can be performed without waste. In addition, when maintaining the temperature of the internal solution, the vacuum area of the vacuum double container is maximized, and the electric heater is less affected by the heat radiation due to the convection of the atmosphere. Very good. As a result, an electric pot having a vacuum double container having high heat efficiency at the time of heating and high heat retention at the time of heat retention has an excellent energy saving effect.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The vacuum-tight terminal of the present invention will be described in detail below.

FIG. 1 is a sectional view of a vacuum-tight terminal of the present invention, and the same parts as those in FIG. 2 are denoted by the same reference numerals. In FIG. 1, 1 is an insulator, 2 is a conductor pin, 3 is a metal sleeve as an outer conductor, 4a is a shock absorbing member, 5 and 6 are metal layers, and 7 is a washer. Be composed.

This vacuum-tight terminal is generally made of an aluminum oxide sintered body, has an insulator 1 having a through hole in the axial direction, and oxygen-free copper or Fe- A conductor pin 2 made of a metal material such as a Ni-Co alloy; a metal washer 7 made of a metal material such as an Fe-Ni-Co alloy brazed to at least one end face of the insulator 1 and the conductor pin 2; A cylindrical metal sleeve 3 made of a metal material such as an Fe—Ni—Co alloy joined to the outer peripheral surface of the insulator 1 via a brazing material;
And a frame-shaped shock-absorbing member 4a made of a metal such as an Fe-Ni-Co alloy joined to the outer peripheral portion.

Then, the flange on the outer periphery of the shock absorbing member 4a of the vacuum-tight terminal is fixed to a through hole provided in the outer wall of the vacuum double container by welding or the like, so that the vacuum double container is attached to the vacuum double container.

The vacuum airtight terminal electrically connects the components inside the vacuum double container and the power supply device and the like outside the vacuum double container to both ends of the conductor pin 2 via a cable or the like, whereby the vacuum airtight terminal is connected. Power supply and transmission of electric signals are possible between components and devices installed inside and outside the heavy container.

When the metal washer 7 is brazed to the insulator 1, a metal layer 5 having a two-layer structure of a metallized layer of Mo—Mn and a Ni plating layer is previously applied to the end face of the insulator 1. The bonding is performed by joining the metal layer 5 and the metal washer 7 via the plate-shaped brazing material 8.

Further, the brazing of the metal sleeve 3 to the insulator 1 is performed on the outer peripheral surface of the insulator 1 in advance in the range necessary for bonding, as in the case of the metal washer 7, by forming a Mo-Mn metallized layer and a Ni plating layer in advance. This is performed by attaching a metal layer 6 having a two-layer structure and joining the metal sleeve 3 to the metal layer 6 via a linear brazing material 9.

In the present invention, as shown in FIG. 3, the shock absorbing member 4a has a cylindrical portion A where the outer peripheral portion of the metal sleeve 3 and the inner peripheral surface of the shock absorbing member 4a are joined. A folded portion B in which one end of the shape portion A is folded with a radius of curvature of 1 to 5 mm, an inclined portion C inclined so as to spread outward from the folded portion B, and a flange portion D extending outward from the inclined portion C. Have. The cross-sectional shape of the folded portion B may be an arc shape, a substantially arc shape including an elliptical portion, or the like.

When the radius of curvature of the folded portion B is 1 mm or less, an external force such as a drop or a collision is applied, so that the cylindrical portion A and the inclined portion C tend to collapse in the direction of the external force before elastic deformation occurs. Without absorbing the impact without utilizing the elasticity effect, the impact is directly applied to the vacuum hermetic terminal, and a crack or a crack of the member itself is generated at the joint, and the vacuum in the vacuum double container is easily broken. In addition, since it becomes difficult to work in terms of metal working, the yield is reduced, which is not practical. When the radius of curvature is 5 mm or more, it is difficult for the shock absorbing member 4a to elastically deform to effectively absorb the shock, and the shock is directly applied to the vacuum-tight terminal without absorbing the shock,
Abnormalities such as cracks or cracks in the members themselves occur at the joints, and the vacuum in the vacuum double container is easily broken.

The thickness of the shock absorbing member 4a is 0.3 to 1.5.
mm, and if it is less than 0.3 mm, the cylindrical portion A and the inclined portion C are crushed in the direction of the external force due to excessive elasticity, and are weakly dropped and collide with the joint of the vacuum-tight terminal. Abnormalities such as cracks or cracks in the members themselves are generated, and the vacuum in the vacuum double container is easily broken. In addition, in fixing to the through-hole portion of the vacuum double container by welding, the shock absorbing member 4a itself is melted and deformed by the heat of welding, and a hole is easily formed. On the other hand, if the thickness of the shock absorbing member 4a exceeds 1.5 mm, the elasticity of the shock absorbing member 4a itself is lost, and it becomes difficult to absorb the shock. Cracks and the like are generated, and the vacuum of the vacuum double container is easily broken.

As shown in FIG. 3, the outer surface of the cylindrical portion A and the cylindrical portion A of the bent portion K at the boundary between the inclined portion C and the flange portion D are formed.
The distance L between the outer surface and the surface perpendicular to the axial direction of the vacuum-tight terminal is preferably 1 to 5 mm.
Is less than 1 mm, the cylindrical portion A and the inclined portion C are crushed in the direction of the external force without being able to secure an interval sufficient to absorb the impact,
Abnormalities such as cracks or cracks in the member itself are generated at each joint of the member, and the vacuum of the vacuum double container is easily broken. If it exceeds 5 mm, there is no problem in shock absorption, but the miniaturization of the vacuum-tight terminal and the miniaturization of the space inside the vacuum double container are hindered.

Thus, the vacuum hermetic terminal of the present invention can secure airtight stably against an impact due to an external force such as a drop or a collision, and can be an extremely highly reliable vacuum hermetic terminal.

FIG. 5 is a sectional view of an electric pot using the vacuum-tight terminal of the present invention. In FIG. 5, the same parts as those in FIG. 6 are denoted by the same reference numerals. This electric pot has an inner side wall 10 and an outer side wall 11 formed at a substantially constant interval, and the space between the inner side wall 10 and the outer side wall 11 is hermetically sealed in a vacuum. A vacuum double container having a container formed by an inner wall 10 and an outer wall 11, and an electric heater 13 provided on the inner wall 10 of the vacuum double container.
And a vacuum airtight terminal 15 inserted into a through hole formed in the outer wall 11 and connected in an airtight manner to supply electric power to the electric heater 13.

The inner wall 10 and the outer wall 11 are made of stainless steel or the like, and have a heat conduction of about 60 W / (m · K). The space between the inner wall 10 and the outer wall 11 is a degree of vacuum of 1.3 × 1
It is a vacuum region 16 of 0 ^-6 Pa, and the thermal conductivity of air is 2.
6 × 10 ⁻² W / (m · K) (room temperature) to 3.2 × 10 ⁻² W
/ (M · K) (100 ° C), the heat insulation effect is very high, and the thermal conductivity is 0 W / (m · K
K) is as close as possible.

Although the electric heater 13 is provided outside the inner wall 10 in the above embodiment, it may be provided inside the inner wall 10. In that case, the thermal efficiency of the electric heater 13 is further improved, enabling quick heating and increasing the heat retaining effect.

Thus, the electric pot using the vacuum-tight terminal of the present invention has a high impact resistance against an impact due to an external force such as a drop or a collision, and the electric heat provided on the inner side wall of the vacuum double container. The heater efficiently heats the content liquid such as water, and improves the thermal efficiency.

Further, the electric pot of the present invention has a configuration in which the vacuum region is maximized and incorporates an electric heater, thereby effectively suppressing the influence of heat radiation due to convection of the atmosphere when the electric heater is not energized. And has the effect of improving the heat retention.

[0041]

Embodiments of the present invention will be described below.

Example 1 The vacuum-tight terminal of FIG. 1 was constructed as follows. The joining between the metal washer 7 and the insulator 1 and the joining between the conductor pin 2 and the metal washer 7 are performed by forming a 15 μm-thick Mo-Mn metallized layer and a 2 μm-thick Ni plating layer on the end face of the insulator 1 in advance. This was performed by attaching a metal layer 5 having a two-layer structure in advance, and joining the metal layer 5 and the metal washer 7 at an end face. At this time,
In the gap of 0.05 mm between the metal layer 5 and the metal washer 7,
Inner diameter Φ (diameter) 1mm, outer diameter Φ3mm, thickness 0.05m
m-plate-shaped brazing material 8 made of Ag-Cu alloy
Was set and heated to 820 ° C. to join.

Further, the metal sleeve 3 and the insulator 1 are placed in a 0.
In order to fill the gap of 05mm, the diameter Φ of the section is 0.3
A linear brazing material 9 made of an Ag-Cu alloy having a thickness of 2 mm was placed in the gap, and was heated to 820 ° C and joined. Thereafter, a frame-shaped shock absorbing member 4a of various dimensions is fitted into a region of about half from one end of the outer peripheral portion to the center portion of the metal sleeve 3, and one end of the metal sleeve 3 and one end of the shock absorbing member 4a are attached. Various welded joints were produced.

As shown in FIG. 4A, the shock absorbing member 4
a is 0.2 mm, the interval L between the outer surface of the cylindrical portion A and the outer surface of the cylindrical portion A of the bent portion K at the boundary between the inclined portion C and the flange portion D is 2 mm, and R ( Radius of curvature)
mm and the same product as in Example 1
And

As shown in FIG. 4B, the shock absorbing member 4
a has a thickness of 0.3 mm, an interval L of 2 mm, and a folded portion B
The product B was prepared in the same manner as in Example 1 above, with R (curvature radius) of 1.3 mm.

As shown in FIG. 4C, the shock absorbing member 4
a has a thickness of 1.5 mm, an interval L of 2 mm, and a folded portion B
The product C was prepared in the same manner as in Example 1 above, with the R (curvature radius) of 2.5 mm.

As shown in FIG. 4D, the shock absorbing member 4
The thickness of a is 2.0 mm, the interval L is 2 mm, and the folded portion B
The product D was prepared in the same manner as in Example 1 above, with R (curvature radius) of 3.0 mm.

As shown in FIG. 4E, the shock absorbing member 4
a has a thickness of 0.5 mm, an interval L of 1 mm, and a folded portion B
The product E was manufactured in the same manner as in Example 1 except that R (curvature radius) was 1.0 mm.

As shown in FIG. 4F, the shock absorbing member 4
a has a thickness of 0.5 mm, an interval L of 5 mm, and a folded portion B
And R (curvature radius) was set to 3.0 mm, and a product produced in the same manner as in Example 1 was designated as product F.

As shown in FIG. 4 (g), the conventional product shown in FIG.

For each of these products A to G,
Impact test at room temperature in air atmosphere {MIL-STD (Milita
ry Standard) -202F METHOD
213A}, an impact of about 50 G (G: gravitational acceleration) was applied once with a half-sine wave waveform within 11 msec, and it was confirmed whether or not there was any abnormality in each joint.

As a result, in the product A, it was confirmed that the shock absorbing member 4a was crushed, and microcracks occurred in the insulator 1 made of the aluminum oxide sintered body. In addition, the shock absorbing member 4a may be used at the time of manufacturing before the impact test.
While welding is performed to the through hole provided on the outer wall of the vacuum double container, holes are formed in several places within 1 mm from the welded part in the shock absorbing member 4a due to the heat of welding. It was confirmed that the vacuum double container could not be vacuum sealed.

For the product B, deformation of the shock absorbing member 4a was confirmed, but no abnormality was confirmed at the joint.

In the product C, no abnormality was confirmed.

In the product D, the shock absorbing member 4a was not deformed, but microcracks occurred in the insulator 1 made of the aluminum oxide sintered body.

In the product E, it was confirmed that the shock absorbing member 4a was slightly deformed, but no other abnormality was found.

In the product F, it was confirmed that the shock absorbing member 4a was slightly deformed, but no other abnormality was found.

It was confirmed that the product G had cracks on the insulator 1 side at the joint between the insulator 1 and the metal sleeve 3.

As described above, in the vacuum-tight terminal (products B, C, E, F) provided with the shock absorbing member 4a of the present invention,
It was found that abnormalities such as joints were unlikely to occur due to the impact.

An electric pot A of the present invention using the vacuum airtight terminal 15 and having a vacuum double container with a built-in electric heater 13 was constructed as shown in FIG. As a comparative example, a conventional electric pot B shown in FIG. 6 was manufactured.

The heating characteristics and the heat retention characteristics were measured as follows. FIG. 7 is a block circuit diagram of the measuring circuit. The measuring method will be described below. 500 cc of tap water is placed as the content liquid 17 in each of the electric hot water container (electric pot) A and the electric hot water container (electric pot) B, and power is supplied in parallel from an external power source via the same slidac. An electric current of 60 V is applied to the electric heater 13 from the vacuum hermetic terminal 15 attached to the heavy container. The content liquid 17 is heated by this method, and the content liquid 17 is heated to 100 ° C.
The power supply was stopped at the time when the temperature became, and then the product was naturally cooled. The parameters of the experimental data of heating and heat retention at this time were the temperature and the time required for its change. That is, the time required for the content liquid 17 to reach 100 ° C. from the start of power supply and the time required for the heated content liquid to fall from 100 ° C. to 90 ° C. were investigated.

FIG. 8 shows the time required for heating, in which the horizontal axis represents time and the vertical axis represents the temperature of the content liquid 17, and the required time required for temperature rise was measured. About 26 liquid 17
When the temperature is raised from 100 ° C. to 100 ° C., the required time is 40.5 minutes in the electric pot A of the present invention, the required time is 43.5 minutes in the conventional electric pot B, It was found that the temperature reached 100 ° C. three minutes earlier than the electric pot B.

FIG. 9 shows the time required for keeping the temperature, where the horizontal axis represents time and the vertical axis represents the temperature of the content liquid 17, and the time required for cooling was measured. When the internal solution 17 is cooled from 100 ° C. to 90 ° C., the electric pot A of the present invention
It was found that the required time was 21.2 minutes, that the conventional electric pot B had a possession time of 13.5 minutes, and that the electric pot A was cooled 7.7 minutes later than the electric pot B.

It should be noted that the present invention is not limited to the above embodiment, and that various changes may be made without departing from the spirit of the present invention.

[0065]

According to the present invention, there is provided a vacuum-tight terminal in which the outer peripheral portion of an outer conductor is joined to a through hole of a vacuum double container via a metal frame-shaped shock absorbing member. A tubular portion whose inner peripheral surface is joined to the outer peripheral portion of the outer conductor; a folded portion in which one end of the tubular portion is folded in the middle of the outer peripheral portion with a radius of curvature of 1 to 5 mm; By having an inclined portion that is inclined to spread and a flange portion that continues outward from the inclined portion, even if a large residual thermal stress due to a difference in thermal expansion coefficient occurs at each joint portion, the vacuum of the present invention can be used. The vacuum double container with the hermetic terminal attached, when dropped or impacted by external force such as collision, greatly suppresses the occurrence of cracks or cracks of the members themselves at each joint of the vacuum hermetic terminal, As a result, the vacuum is hermetically stable and highly reliable. It has the effect that can provide children.

Further, according to the present invention, since the shock absorbing member has a thickness of 0.3 to 1.5 mm, elastic deformation of the shock absorbing member itself is effective even when an impact due to an external force such as a drop or a collision is applied. In this case, the occurrence of cracks and cracks of the members themselves at each joint of the vacuum hermetic terminal is greatly suppressed, and a stable and highly reliable vacuum hermetic terminal can be provided.

Further, in the present invention, the interval in the direction perpendicular to the axial direction between the outer surface of the cylindrical portion and the outer surface of the cylindrical portion of the bent portion at the boundary between the inclined portion and the flange portion is 1 to 5 mm. As a result, even if an impact due to an external force such as a drop or a collision is applied,
By securing an interval equal to or greater than the amplitude of the vibration of the outer conductor of the vacuum-tight terminal, the outer conductor and the outer surface of the cylindrical portion come into contact with the inner surface of the inclined portion due to the vibration, and cracks or members themselves are formed at each joint of the vacuum-tight terminal Cracks and the like are greatly suppressed, and a stable and highly reliable vacuum-tight terminal can be provided.

The electric pot of the present invention comprises an electric heater provided on the inner side wall of the vacuum double container, and an electric heater inserted into a through hole formed on the outer side wall and connected in an airtight manner to supply electric power to the electric heater. An electric pot having a vacuum-tight terminal, wherein the vacuum-tight terminal is the vacuum-tight terminal of the present invention, so that when the inner solution is heated, the electric heater provided on the inner side wall of the vacuum double container is extremely high. Heating can be performed with thermal efficiency, and heat transfer to the content liquid can be performed without waste.
Further, when the inner solution is kept warm, the vacuum area of the vacuum double container is configured to be maximized, and it is hardly affected by the heat radiation due to the convection of the atmosphere. As a result, it has an excellent energy saving effect.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a vacuum-tight terminal of the present invention.

FIG. 2 is a sectional view showing a conventional vacuum-tight terminal.

FIG. 3 is an enlarged sectional view of the shock absorbing member of the present invention.

FIGS. 4A to 4G are cross-sectional views showing various forms of a shock absorbing member.

FIG. 5 is a sectional view of an electric pot using the vacuum-tight terminal of the present invention.

FIG. 6 is a sectional view of a conventional electric pot.

7 is a block circuit diagram of a measurement circuit for measuring heating characteristics and heat retention characteristics of the electric pot A of FIG. 5 and the electric pot B of FIG.

FIG. 8 is a graph showing the results of measuring the heating characteristics of an electric pot A of the present invention and a conventional electric pot B.

FIG. 9 is a graph showing the results of measuring the heat retention characteristics of an electric pot A of the present invention and a conventional electric pot B.

[Explanation of symbols]

 1: Insulator 2: Conductor pin 3: Metal sleeve 4a: Shock absorbing member 5, 6: Metal layer 7: Metal washer 8: Plate brazing material 9: Linear brazing material 10: Inner wall 11: Outer wall 13: Electric heating Heater 15: Vacuum-tight terminal 16: Vacuum area A: Cylindrical part B: Folded part C: Inclined part D: Flange part

Claims (4)

[Claims] 1. An insulator comprising: a columnar insulator having a through hole formed in an axial direction; a conductor pin inserted and joined to the through hole; and a cylindrical outer conductor joined to the outer peripheral surface of the insulator. A vacuum-tight terminal that is inserted into a through-hole provided on an outer wall of the vacuum double container, and an outer peripheral portion of the outer conductor is joined to the through-hole via a metal frame-shaped shock absorbing member, The shock absorbing member has a tubular portion whose inner peripheral surface is joined to the outer peripheral portion, a folded portion in which one end of the tubular portion is folded in the middle of the outer peripheral portion with a radius of curvature of 1 to 5 mm, and the folded portion. What is claimed is: 1. A vacuum-tight terminal, comprising: an inclined portion inclined to spread outward from a portion; and a flange portion extending outward from the inclined portion. 2. The shock absorbing member has a thickness of 0.3 to 1.5.
2. The vacuum-tight terminal according to claim 1, wherein 3. An interval in a direction perpendicular to the axial direction between an outer surface of the cylindrical portion and a surface of the bent portion at a boundary between the inclined portion and the flange portion on the outer surface of the cylindrical portion is 1 to 5 mm. The vacuum hermetic terminal according to claim 1 or 2, wherein the terminal is provided. 4. An inner wall and an outer wall formed at a substantially constant distance from each other, and a space between the inner wall and the outer wall is hermetically sealed in a vacuum. A vacuum double container having a container formed by an outer wall, an electric heater provided on an inner wall of the vacuum double container, and the electric heater inserted in a through hole formed in the outer wall and connected in an airtight manner to the heater And a vacuum-tight terminal for supplying electric power to the electric pot, wherein the vacuum-tight terminal is
3. An electric pot, which is the vacuum-tight terminal according to any one of 3.