DE202017101031U1 - Double-walled vacuum glass insulation can - Google Patents

Abstract

A double-walled vacuum glass solar flask (100) comprising at least one hollow glass body (20) having an evacuated space (24) formed between two spaced-apart extruded glass cylinders (21, 22), and an annular one connectable to a can neck (23) Pouring cap (30) with an inner pouring opening, characterized in that - the glass cylinders (21, 22) consist of two extruded glass tube sections spaced apart from each other by a bottom plate (25, 27) made of glass at their lower end and the are fused together at their respective upper end and form a can neck (23) which closes off the intermediate space (24), - that the glass hollow body (20) consists of heat-resistant borosilicate glass.

Description

• - einen Glashohlkörper mit einem evakuierten Zwischenraum, der zwischen zwei zueinander beabstandeten, extrudierten Glaszylindern gebildet ist,
• - und einen mit einem Kannenhals verbindbaren, ringförmigen Ausgussaufsatz mit einer inneren Ausgießöffnung.

The invention relates to a double-walled vacuum glass insulation can, at least comprising

• a glass hollow body with an evacuated gap formed between two spaced, extruded glass cylinders,
• - And connectable with a Kannenhals, annular Ausgussaufsatz with an inner pouring opening.

An insulated jug is a closable container and serves to keep drinks or other liquids warm or cold for a long time. There is always the requirement for the construction of a jug that the heat transfer between the interior of the jug and the environment is as low as possible, ie heat conduction, heat flow and heat radiation from the inside out or from outside to inside are kept small. Heat conduction is kept low by two measures: The walls made of glass are poor heat conductors. Convection heat losses are reduced by evacuation. The heat radiation is kept low, because the insulating vessel is mirrored inside and heat radiation is strongly reflected on smooth and bright surfaces. This is achieved overall that a hot or warm liquid in the insulated vessel cools only very slowly, because the heat exchange with the environment is low.

The glass bulb is the heart of the vacuum jug and is created by a complex manufacturing process. All known glass flasks are mouth or machine blown and have comparatively very thin walls, usually in the range 1 to 1.5 mm. An inner and an outer piston are fused together to form a vacuum insulation container so that a cavity remains between them. The inner surfaces between the glass bodies are mirrored via a glass tube, which is attached to the bottom of the glass bulb. The result is a heat shield that reflects the heat and "trapped" inside the glass. Then the air is pumped out between the pistons, creating a vacuum. So there are hardly any air molecules that can transport the heat. Thereafter, the tube is fused. The production of the piston requires a lot of unproductive labor, in particular cutting and cutting of the piston end, melting of a new outside, securing the capillary and thus obstructed stability of the bottles. Other vessels of this kind as table or utility containers for many purposes are unknown.

A digital glass test procedure checks each individual vacuum glass for keeping warm and stable. In the assembly process, the glass bulb is placed in a sheath, because he is undressed unattractive and a naked, thin-walled glass bulb is not protected against mechanical stress. Due to the poor dimensional stability of the glass bulb must be padded down padded in the sheath. In addition, constructive measures must be taken to compensate for the very large height tolerances of the glass bulb. This is usually achieved by a threaded can tray or a solid bottom plate for screwing.

If a glass piston breaks, the replacement is time-consuming, requiring the use of tools and manual dexterity. There is a risk of injuring yourself on the glass splinters. The cleaning of the interior, in which the liquid is filled, usually proves to be demanding. The glass bulb is thin-walled and not suitable for cleaning with hard or even pointed objects. The cleaning of conventional glass bulbs is also complicated by the fact that they always have a tapered neck, so an undercut. Special brushes with soft, sponge-like attachments are offered by specialist dealers. When cleaning with special tabs or other home remedies, for example with soda, it is recommended that you leave it overnight with the addition of hot water to ensure residue-free cleaning. It happens that liquid gets into the space between the glass bulb and the casing. It can lead to mold and a cleaning in the rather inaccessible gap area is difficult.

Vacuum insulation containers made of stainless steel are also known. A common problem with stainless steel vessels available today is the loss of insulation after one to two years. To obtain a shiny, stain-free appearance, the vessels are pickled in acid. The resulting hydrogen is partially embedded in the outer steel skin. Because of the pressure gradient, the good heat-conducting hydrogen diffuses gradually into the vacuum and worsens this noticeably, the high insulating capacity is lost. The possibility of a subsequent evacuation is usually not provided.

Double-walled drinking glasses of heat-resistant glass are known in the art. The DE 20 2008 001 921 U1 describes, for example, a drinking glass, which consists of two separate glasses. The inner glass is fused with the outer glass on the surface, creating an isolated space. The glass still has a non-slip plastic lid with a closure for a drinking straw.

Also known is a glass jar for preparing an infusion beverage, as described in the patent DE 10 2014 202 219 A1 is described, which consists of an outer and inner wall with molded spout.

Conventional glass flasks, especially with high insulated vessels, are thin-walled and the inner and outer walls are connected to one another only in the area of the can neck. They have to be stably held in a fixed position, especially with slim vessels, ie with geometries with a high ratio of height to diameter with spacers. The spacers between the inner glass bulb and the jacket prevents strong pivoting movements of the inner piston when the sheath is moved abruptly and thus a high stress load of the can neck. The object of the present invention is therefore to design a double-walled vacuum glass insulation can with dimensionally accurate outer geometry, which can be used without a separate enclosure, and which is mechanically and thermally resilient.

This object is achieved by a double-walled vacuum glass insulating pan with the features of claim 1.

The production of two glass tube sections made of extruded glass tube is advantageous because they do not entail a volumetric variance. The use of extruded glass tube sections is also advantageous because they are exactly round and thus IR radiation reflected by the mirror layer reaches exactly the center of the inner vessel.

Advantageous is the use of extruded glass tube sections or extruded glass cylinder with a higher wall thickness of preferably 2 mm to 4 mm. The product produced is characterized by dimensional accuracy and reproducibility. A series production guarantees in the same time higher quantities compared to a manual production. The material costs such as the labor required for an additional coat around the insulator around deleted.

In particular, highly viscous borosilicate glass is used for the double-walled glass body. It is a very temperature-resistant and low-stress glass, which is mainly used for glassware in the laboratory and in the home use. The insensitivity to sudden temperature fluctuations is a result of the low coefficient of thermal expansion of less than 3.3 × 10 ^-6 K ^-1 , which is necessary when filling hot liquids in a jug. Borosilicate glass is very well suited for the production of cylindrical pistons with constant wall thickness. The wall thickness can be produced 4-8 times as thick as with a conventionally blown glass bulb and is characterized by high mechanical stability and breakage resistance. Due to the constant wall thickness and the interconnections of up to 4 mm, the insulation unit is characterized by a high mechanical stability. The cylindrical shape is robust, offers high pressure stability and resistance to breakage. In the invention set forth herein, insulating body and lining are one. This design of the housing construction combines function and protection in a single unit.

The inner surfaces between the glass bodies, which face the closed, evacuable cavity, are preferably silver-coated or coated with another reflective metal layer and act as a heat shield, which reflects the heat of the filled liquid. The particular advantage of the coating in connection with the use of thick-walled, dimensionally stable glass tube sections is also the excellent optical quality of the mirrored surface when looking from the outside. This appears perfectly smooth through the glass outer layer. Fingerprints and soiling are not visible, so that there is always a perfect and noble looking look

There are several options in the final version of the jug possible. A basic version without handle is designed for space-saving use and low weight, so it is an ideal travel companion in a lightweight and compact format. In addition, a variant with a handle that can be attached to the spout attachment. As an alternative, a handle directly on the glass body is possible.

The spout attachment can be screwed directly to the can neck and is easy to remove. Thus, the hollow glass body is easy to clean and dishwasher-suitable and the lack of rejuvenation, the interior can be cleaned optimally and without residue. The hygienic and fast cleaning of the smooth and non-angled cylinder allows in particular the use in hotels, hospitals and the catering trade.

The insulator can, for. B. for a capacity of 0.75 liters of liquid can be optimally prepared.

The cylindrical shape in conjunction with the solid and heavy glass bottom plate increases the stability through the lower center of gravity and fits well in the hand. The puristic design is timeless and works on the viewer because of the translucent silvered surface of the inner flask noble and is unique in this design.

• 1 eine Vakuumglasisolierkanne in perspektivischer Explosionszeichnung;
• 2 die Vakuumglasisolierkanne im Schnitt und
• 3 die Vakuumglasisolierkanne im Querschnitt.

The invention will be explained in more detail with reference to the drawings. The figures show in detail:

• 1 a Vakuumglasisolierkanne in perspective exploded view;
• 2 the vacuum glass oiling can in section and
• 3 the vacuum glass polishing can in cross section.

In 1 is the vacuum jug 100 shown as an exploded perspective view. Here is the version with handle 32 displayed. The insulating jug 100 consists of three detachable assemblies, which are shown separately from each other according to the invention, namely hollow glass body 20 , Spout attachment 30 with handle 32 and the lid 10 ,

The glass hollow body 20 has a slim cylindrical shape and is made entirely of borosilicate glass. The glass hollow body 20 is at one end with a bottom plate 25 locked. At the opposite, upper end is the glass hollow body 20 open and forms the pitcher neck 23 with a connecting means such as in particular an impressed external thread.

Next to the glass hollow body 20 is in 1 the spout attachment 30 shown. This is a threaded plastic screw cap on the hollow glass body 20 is screwed on.

The spout attachment 30 is annular and has a centered spout opening 33 , through the fluids in the glass hollow body 20 can be filled or by the glass hollow body 20 contained liquid of the spout 31 can be fed. On one side of the spout attachment 30 is a handle 32 appropriate. This leads to the side of the annular spout attachment 30 in a bow down and ends free. At the opposite area of the spout attachment 30 is a spout - also spout 31 called - incorporated. It gets its shape through a recessed area of material at the upper ring area of the spout attachment 30 and the spout 31 has moved to the top something. This is to be granted a precise spout of the liquid.

To close the vacuum glass oiling can 100 is a third component in a preferred embodiment of the invention a jar lid 10 intended. This has the shape of a finger-thick disc, and runs down slightly conical. He is in the spout opening 33 the spout attachment 30 placed. There he finds a firm position, since the spout essay 30 designed so that the lid 10 exactly centered in its dimensions and about one quarter of its height in the recessed annular portion of the spout attachment 30 can be placed accurately. If the spout essay 30 is made of plastic, in particular a seal made of TPE can be formed.

2 shows the vacuum glass cleaning can 100 on average. Here is the exact structure of the double-walled glass hollow body 20 clearly visible. It consists of the inner glass cylinder 21 and the outer glass cylinder 22 , which are formed from extruded glass tube sections. The inner glass cylinder 21 encloses an intended for receiving the liquid inner space 28. This is from the outer glass cylinder 22 , which also represents the outer shell at the same time, encased. The inner glass cylinder 21 and the outer glass cylinder 22 are under education one at the Kannenhals 23 merged together. Essential for the stability of the vacuum glass coffee percolator according to the invention is that in the region of the connection to the can neck 23 at least the preferred, relatively large wall thickness of 2mm to 4 mm is achieved, so that this mechanically stressed area is not weakened.

At the bottom, the glass cylinders are each through a bottom plate 25 , 27 made of glass, with the bottom plates 25 , 27 also maintain a distance from each other, so that the vacuum gap 24 can continue there.

On the open end of the glass hollow body 20 becomes the spout attachment 30 screwed. This preserves the glass hollow body 20 the canoe character.

3 represents the glass hollow body 20 in cross-section. Both glass cylinders 21, 22 are parallel to each other and form between them an evacuable space 24 , The inner layer of the outer glass cylinder 22 and the outer layer of the inner glass cylinder ( 21 ) are silver coated and form a mirror to the cavity side 26 , Liquid only comes with the surface of the inner glass cylinder 21 in touch.

LIST OF REFERENCE NUMBERS

100

Vakuumglasisolierkanne

10

cover

20

Hollow glassware

21

inner glass cylinder

22

outer glass cylinder

23

can neck

24

evacuable space

25

baseplate

26

mirror

30

Spout attachment

31

spout

32

handle

33

spout

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202008001921 U1 [0007]
• DE 102014202219 A1 [0008]

Claims (7)

A double-walled vacuum glass solar flask (100), comprising at least - a hollow glass body (20) with an evacuated space (24) formed between two spaced extruded glass cylinders (21, 22), and an annular one connectable to a can neck (23) Pouring cap (30) with an inner pouring opening, characterized in that - the glass cylinders (21, 22) consist of two mutually spaced, extruded glass tube sections which are each closed at their lower end by a bottom plate (25, 27) made of glass and fused together at their respective upper end and forming a Kannenhals (23) which closes the intermediate space (24); - That the glass hollow body (20) consists of heat-resistant borosilicate glass. Vacuum glass cleaning can (100) according to Claim 1 characterized in that the inner wall of the outer glass cylinder (22) and the outer wall of the inner glass cylinder (21) facing the sealed, evacuated space (24) are coated with a reflective metal layer (26). Vacuum glass cleaning can (100) according to Claim 1 or 2 , characterized in that the can neck (23) of the glass hollow body (20) is provided with an external thread and the pouring attachment (30) is provided with an internal thread. Vakuumglasisolierkanne (100) according to one of Claims 1 to 3 , characterized in that the height of the glass hollow body (20) at least twice the diameter of the outer glass cylinder (22). Vakuumglasisolierkanne (100) according to one of Claims 1 to 4 , characterized in that the spout attachment (30) has a spout (31) and a handle (32). Vacuum glass cleaning can after one of the Claims 1 to 5 , characterized in that the spout opening (33) on the spout attachment (30) with a lid (10) is closable. Vacuum glass cleaning can after one of the Claims 1 to 5 , characterized in that the wall thickness of the glass cylinder (21, 22), the bottom plates (25, 27) and the can neck (23) is at least 2 mm to 4mm.

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