JPH0232199Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a metal vacuum double container in which a vacuum is created between the metal double walls.

Prior Art In order to create a vacuum between the metal double walls in this type of container, at least one final joint of each metal double wall is joined in a vacuum space with a predetermined degree of vacuum, or in the atmosphere. After all bonding is completed, the air inside the double wall is removed through a vacuum chip provided in a part of the double wall, and when a predetermined degree of vacuum is reached, the vacuum chip is closed. At this time, air remains inside the double wall in the narrow corners of the joint boundary and in a part of the rough inner surface of the double wall, and after creating a sealed vacuum space between the double walls, over time The degree of vacuum decreases. This results in a decrease in the heat insulation properties of the vacuum double wall, which means the most important decrease in performance when the vacuum double wall container is used as a heat insulating container such as a thermos flask.

Conventionally, a device has been proposed in which a gas adsorbing substance, so-called getter, is housed within the vacuum double wall and residual gas is adsorbed by the getter to prevent the degree of vacuum from decreasing. Solid gettua is used because of its ease of handling and management.
In order to exhibit a sufficient gas adsorption effect, consideration was given to exposing as much of the getter surface as possible within the vacuum space, and whether the getter surface was simply housed in the vacuum space (Special Publications Publication No. 1973)
-1546 Publication), provide a ventilation chamber in the vacuum space to house it (Utility Model Application Publication No. 55-151238), or use elastic clamping between the inner surface of the vacuum space and a fixture fixed thereto ( (Utility Model Application Publication No. 58-26435).

However, in the first two cases, the getters rattle and make noise during handling of the vacuum double container, which causes discomfort to the user. The latter one is superior in that it can prevent wobbling while leaving the geta sufficiently exposed, but the fixture has one end fixed to the inner surface of the vacuum space, and the other free end elastically presses the geta. The elastic holding force tends to loosen because it is only held in place. Moreover, the elastic holding force is also weakened by heating of the fixture when the vacuum double container is soldered and sealed in the heating chamber. As a result, the grip of the getter loosens during use of the container, causing wobbling.

This invention aims to solve these problems, and the getter housed in the vacuum double wall is connected between the inner surface of the vacuum double wall and the holder fixed to the inner surface. In a double vacuum container made of metal that is partially clamped and held, the holder is applied to the back of the getter in an almost cross shape, and its arms in a straight line are attached to the back of the getter along both sides of the getter. It is characterized in that the retaining pieces reach the inner surface and are fixed, and the other holding pieces on a straight line are bent along both sides of the getter, and the getter is held between the getter and the inner surface.

With this configuration, both arms of the cross-shaped holder applied to the back of the geta extend along both sides of the geta, and reach the inner surface of the vacuum space where the geta is applied. Since it is fixed to the inner surface of the vacuum space, it forms a support member that is fixed at both ends by crossing the getter and along both sides of it, and can securely hold the getter without causing any loosening between it and the inner surface of the vacuum space. . In addition, both holding pieces on the other straight line of the holder extend in a direction perpendicular to the arms and are bent along both sides of the getter, so that the getter is held between the arms and the inner surface of the vacuum space. It is possible to reliably prevent it from coming off in the lateral direction from the firm clamping position. Furthermore, since the holder is approximately cross-shaped and the two holder pieces located on one straight line need only hang over part of the side surface of the geter, the exposed area of the geter can be increased.

Purpose This invention provides a metal vacuum double-walled container that can eliminate the above-mentioned drawbacks of the conventional vacuum double-walled container by holding the getter without wobbling on the inner surface of the vacuum double-wall with its surface exposed to a sufficient extent for gas adsorption. The purpose is to provide

Structure/Function In this device, the getter housed in the vacuum double wall is partially held between the inner surface of the vacuum double wall and the holder fixed to the inner surface, and the getter is held by the holder. A communication portion that exposes the surface of the non-pinched portion of the getter to the vacuum space within the vacuum double wall is formed alone or between the getter and the inner surface of the vacuum double wall.

Holding the getter with this holder prevents the getter from wobbling within the vacuum double wall. In addition, the holder that holds the getter holds the getter between the inner surface of the vacuum double wall without wobbling, but it is used alone or between Since the getter has a communication portion formed between the inner surface of the heavy wall and the inner surface of the heavy wall, the surface of the non-clamped portion, which occupies most of the entire surface, is exposed to the vacuum space through the communication portion, and exhibits a sufficient gas adsorption effect.

If the getter is held between the holder and the inner surface of the vacuum double wall using a pressing force due to the elasticity of the holder, the getter will be prevented from wobbling due to the small contact surface with the getget, and the getter will be held by the inner surface of the vacuum double wall. The surface area communicating with the vacuum space increases.

When one of the mutual contact surfaces between the getter, the holder, and the inner surface of the vacuum double wall is formed into an uneven surface that communicates with the vacuum space, the surface area of the getter exposed to the vacuum space increases accordingly. In this case, by forming irregularities on the getter surface, the specific surface area of the getter increases.

Getsuta is activated by heating and exhibits a strong gas adsorption effect, and the final joint of the vacuum double wall can be brazed while being heated in a vacuum space, or
The internal air is suctioned out while heating, and the vacuum chip is finally closed by cold pressure welding to form a vacuum-sealed space.The inside of the double wall becomes a vacuum-sealed space by receiving the heat. It exhibits a gas adsorption effect and is also activated by heating.
It adsorbs residual gases such as N ₂ and O ₂ , but when the getter is activated, the getter itself releases the H ₂ gas it had already adsorbed. Therefore, if the getter is held near the final joint of the vacuum double wall or the vacuum chip, the gas released from the getter itself will be exhausted to the outside as the vacuum double wall is evacuated. The residual gas adsorption limit of the getter increases accordingly.

Embodiment To explain the embodiment shown in FIGS. 1 to 3, a vacuum double-walled metal container 4 with a vacuum space 3 between an inner container 1 and an outer container 2 made of stainless steel is used. The case where it is used as a portable thermal insulation bowl is shown. The container 4 is joined 5 between the openings of the inner container 1 and the outer container 2, and between the body 2a and the bottom 2b of the outer container 2, so that the space between the double walls 1 and 2 is sealed. Between these sealed double walls 1 and 2,
A predetermined degree of vacuum is achieved by suctioning and removing the internal air while heating it through a copper vacuum chip 6 that is bonded 5 to the center of the outer container bottom 2b, and when the predetermined degree of vacuum is reached, the chip is removed while maintaining the suction state. Close the tip of 6 by cold pressure welding 7.
By doing so, a sealed vacuum space 3 is created.

The bottom of the container 3 is covered with a synthetic resin bottom plate 9 that is force-fitted 8 to the lower end of the outer periphery. A synthetic resin spout member 10 communicating with the inner container 1 is forcibly fitted 11 into the upper end of the container 3, and the inner container 1 can be attached to the inner circumference of the spout member 10 by a slight rotation that does not result in attachment or detachment.
A stopper 12 is screwed 13 to open and close the spout 1a. The upper spout 10a of the spout member 10 is closed by a synthetic resin lid 15 screwed 14 around its outer periphery.

The inner surfaces of the vacuum double walls 1 and 2, especially the outer container bottom 2b
A getter 16 is arranged near the vacuum chip 6 on the inner surface. The getter 16 is a holder 1 fixed to the inner surface of the bottom portion 2b by spot welding 17 or the like.
It is partially held between 8 and 8. Holder 18
A communicating portion 19 is formed either alone or between the inner surface of the bottom portion 2b and exposing the surface of the non-pinched portion of the getter 16 to the vacuum space 3. The holder 18 is formed by pressing a suitable metal plate such as stainless steel, and has a small ring 18b that is applied to the top surface of the getter 16.
Width-width connecting arms 18c extending in a straight line on both sides centering on
and the small ring 18b on a straight line orthogonal to them.
The connecting arm 18c has a substantially cross-shaped holding piece 18d extending on both sides, and one of the two split-ring mounting seats 18a is attached to one end of the connecting arm 18c, and the other mounting seat 18a is attached to the other end of the connecting arm 18c. 18a are connected. These mounting seats 18a, 18a surround the getter 16 and are fixed to the inner surface of the bottom portion 2b by spot welding or the like, so that the small ring body 18b comes into pressure contact with the back of the getter 16, and the getter 16 is placed between the inner surface of the bottom portion 2b. The connecting arms 18c, 18c are bent along the sides of the getter 16 while being held under pressure.
Since the tips of both holding pieces 18d are bent along the side surface of the getter 16, the getter 16 is prevented from coming off or moving around from the clamping position. The getter 16 is held between the inner surface of the bottom portion 2b and the small ring body 18b in a state where the getter 16 is surrounded from the periphery.

In this case, the holder 18 can accommodate variations in the thickness of the geta 16 by changing the interval between the two split annular mounting seats 18a and changing the angle of the holding piece 18d. Variations in the height of the getter 16 can be accommodated by changing the bending angle of the bending portion.

The second embodiment shown in FIGS. 4 and 5 is similar to the first embodiment.
A cross-shaped holder 21 is used when viewed from the plane without the annular mounting seat and small ring body in the embodiment. The holder 21 has a pair of mounting arms 21a facing each other.
The ends of the mounting arms 21a are attached by spot welding 17 to the bottom part 2b, and the rising parts of the mounting arms 21a and the holding pieces 21b on both sides that are perpendicular to the mounting arms 21a are attached.
The getter 16 is surrounded by the elastic tongue piece 21c formed on the cross-shaped top plate portion, and the getter 16 is pressed and held between the inner surface of the bottom portion 2b and the elastic tongue piece 21c.

In this embodiment, the holder 21 is simpler than in the first embodiment, and the pressure and clamping by the elastic tongues 21c can stabilize the getter 16 with less contact, and the can increase the exposed surface of

In the third embodiment shown in FIG. 6, the portion of the inner surface of the bottom portion 2b that holds the getter 16 between the holder 21 and the like is formed into an uneven surface 61, so that the contact area of the getter 16 with the inner surface of the bottom portion 2b is reduced, and the getter 16 is held between the holder 21 and the like. 16 vacuum spaces 3
Increased surface exposure to

In the fourth embodiment shown in FIG. 7, the upper and lower surfaces of the getter 16 are made into uneven surfaces 81, and even if the holding structure is like that of the first embodiment, the holder 18 of the getter 16 is
The contact surface with the inner surface of the bottom part 2b can be extremely reduced.
At the same time, the specific surface area of the getter 16 increases, so that the residual gas absorption effect of the getter 16 is improved. Providing through holes 82 in the getter 16 can also increase the specific surface area of the getter 16 and make it easier for residual gas to flow around the getter 16, thereby increasing the gas absorption effect.

In the case of the above embodiment, only the liquid container was shown, but it goes without saying that other heat-insulating containers such as a lunch box may also be used.

Effects According to this invention, a getter housed in a vacuum double wall is a metal getter that is partially held between the inner surface of the vacuum double wall and a holder fixed to the inner surface. In the vacuum double container, the holder is placed in a nearly cross shape on the back of the getter, and its arms extending in a straight line extend along both sides of the getter to reach the inner surface and are fixed. The holding pieces on the line are bent along both sides of the geta, and since the geta is held between them and the inner surface, both arms of the cross-shaped holder placed on the back of the geta are bent to fit the geta. It extends along both sides of the getter and reaches the inner surface of the vacuum space where the getter is applied, and is fixed to the inner surface of the vacuum space. The getter can be securely held between the inner surface of the vacuum space and the getter without loosening, and both holding pieces on the other straight line of the holder extend in a direction perpendicular to the arms, so that the getter can be firmly held on both sides of the getter without loosening. Since the getter is bent along the plane, it is possible to reliably prevent the getter from coming off laterally from the securely held position between the arms and the inner surface of the vacuum space. Therefore, it is possible to prevent rattling noises caused by loosening or dislodging of the catch during use of the container. Furthermore, since the getter is held by the cross-shaped holder, there is no problem of reducing its exposure and limiting its action.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the first embodiment, Fig. 2 is a sectional view of the main part, Fig. 3 is a slope view of the main part, and Fig. 4 is a cross-sectional view of the main part.
FIG. 5 is a sectional view of the main part of the embodiment, FIG. 5 is a perspective view of the main part, and FIGS. 6 and 7 are sectional views of the main part showing other embodiments. 1, 2... Vacuum double wall, 3... Vacuum space, 4...
... Vacuum double container, 5 ... Joint, 6 ... Vacuum chip, 16 ... Getter, 17 ... Spot welding, 18, 21 ... Holder, 61, 81 ... Uneven surface, 18c, 21a ... Arm , 18d, 21b...
holding piece.

Claims (1)

[Claims for Utility Model Registration] (1) A getter housed in a vacuum double wall is partially held between the inner surface of the vacuum double wall and a holder fixed to the inner surface. In the double vacuum container made of metal, the holder has a substantially cross shape and is applied to the back of the getter, and both arms in a straight line extend along both sides of the getter and reach the inner surface and are fixed, A metal vacuum double container characterized in that the other straight holding pieces are bent along both sides of the getter to sandwich the getter between them and the inner surface. (2) The metal vacuum double container according to claim 1, wherein the getter is provided near the final joint part of the vacuum double wall or the vacuum chip mounting part. (3) The metal vacuum double container according to claim 1, wherein one of the contact portions between the getter, the holder, and the inner surface of the vacuum double wall has an uneven surface. (4) The metal vacuum double container according to claim 1, wherein the vacuum double wall is formed in the liquid container. (5) The metal vacuum double container according to claim 1, wherein the vacuum double wall is formed in a lunch box.