CN104746753A - Double-vacuum-layer composite vacuum panel with sealing strips and mounting holes and manufacturing method thereof - Google Patents

Abstract

A double-vacuum-layer composite vacuum panel with sealing strips and mounting holes comprises a surface plate, a core plate and a vacuum chamber and is characterized in that the mounting holes are combined with pumping holes, the surface plate is fixed to the outer upper surface of the vacuum chamber, the core plate is arranged at the inner bottom of the vacuum chamber, the surface plate and/or the core plate provide the vacuum chamber with additional strength, the vacuum chamber is a closed chamber formed by a low-carbon steel plate subjected to glass soldering edge sealing at atmospheric pressure and high temperature and high-temperature opening sealing in vacuum, welding portions of the edge of the low-carbon steel plate are provided with the sealing strips, the coefficient of thermal expansion of the low-carbon steel plate is matched with that of glass solder, a separation plate separating the vacuum chamber into two to form double vacuum layers is arranged in the vacuum chamber, and supporting members are arranged in the vacuum layers. A manufacturing method of the double-vacuum-layer composite vacuum panel with the sealing strips and the mounting holes is simple in process. The manufactured double-vacuum-layer composite vacuum panel can overcome the deficiencies of existing insulation boards and vacuum insulation panels and the strength, thermal insulation, sound insulation and fireproof performance and decorative functions can be improved.

Description

Composite evacuated plate of two vacuum layer having weather strip and installing hole and preparation method thereof

Technical field

The present invention relates to energy-saving building technology field, particularly relate to a kind of composite evacuated plate of two vacuum layer having weather strip and installing hole and preparation method thereof.

Background technology

Current building exterior wall heat preserving material used is divided into A level heat insulating material and B level heat insulating material, and the fireproof performance of A level heat insulating material is good, but its heat-insulating property, water resistance etc. are all lower than B level heat insulating material, and there is the problems such as price is high, complicated construction technique; B level heat insulating material has the advantages such as cost is low, good heat insulating, construction technology are ripe, but its durability is bad, heat resistance is poor, easy firing, a large amount of poison gas is not only discharged during burning, and spreading of big fire can be accelerated, so prohibit the use organic insulation material for exterior-wall heat insulation in highrise building and public building.Vacuum heat-insulating plate was applied to building heat preservation field in recent years, its major advantage be belong to A level heat insulating material, good heat insulating, thickness is thin, unit mass is light, but also have that obvious shortcoming is as low in vacuum bag poor air-tightness, puncture-resistant intensity, edge exists cold bridge, soon, easily rise bag, insulation life-span of vacuum decay is short etc.Therefore, building heat preservation needs the new A level heat insulating material researching and developing good heat insulating, long service life.

Applicant discloses a series of evacuated panel and preparation method thereof in July, 2013, although solve the contradiction and problems of the aspect such as fire prevention, insulation, application life that existing heat insulating material exists, but owing to directly metal sheet being welded together, so its edge exists obvious cold bridge, its heat-insulating property is made not reach optimum state.

Evacuated panel can substitute existing warming plate and be applied to and require heat insulation and place that is sound insulation, and some installation sites need punching on warming plate to install, and evacuated panel obviously cannot punch when mounted thereon, otherwise can destroy its vacuum.

Summary of the invention

technical problem to be solved by this invention is for existing building insulating board, warming plate, the defect that vacuum heat-insulating plate exists, a kind of novel composite evacuated plate of two vacuum layer having weather strip and installing hole and preparation method thereof is provided, the preparation method technique of this pair of composite evacuated plate of vacuum layer is simple, the prepared composite evacuated plate of two vacuum layer can overcome existing insulating board, the deficiency of vacuum heat-insulating plate and warming plate, effectively can ensure the tightness of two composite evacuated plate of vacuum layer, increase the service life, and its intensity and heat insulation can be increased, sound insulation, fireproof performance, also there is good decorative effect simultaneously.

In order to solve the problems of the technologies described above, the invention provides a kind of composite evacuated plate of two vacuum layer having weather strip and installing hole, comprise panel, central layer and vacuum chamber, it is characterized in that installing hole and extract opening unite two into one, described installing hole is through whole composite plate, described panel is fixed on the upper surface outside described vacuum chamber by welding or bonding mode, described central layer is placed on the bottom in described vacuum chamber, described panel and or described central layer provide additional strength for described vacuum chamber, ensure vacuum chamber planarization under atmospheric pressure, described vacuum chamber welds edge sealing by low carbon steel plate at constant-pressure and high-temperature lower-glass, high temperature seals and the closed cavity of formation under vacuo, the edge weld of described low carbon steel plate has weather strip, the coefficient of thermal expansion of described low carbon steel plate and described glass solder matches, described sealing utilizes solder according to hydraulic seal principle automatic-sealed in a vacuum furnace pre-extract opening on vacuum chamber, described solder comprises low-temperature metal and solder, a dividing plate is had in described vacuum chamber, described dividing plate forms two vacuum layer by being divided into two in described vacuum chamber, have supporter in described vacuum layer, above support makes separately or directly formed on vacuum chamber or dividing plate or central layer.

In order to solve the problems of the technologies described above, the invention provides a kind of preparation method having the composite evacuated plate of two vacuum layer of weather strip and installing hole, it is characterized in that comprising the following steps:

The first step, the have shape of the composite evacuated plate of two vacuum layer of weather strip and installing hole and size according to required making make one piece of panel, one piece of central layer, one piece of dividing plate and two pieces of low carbon steel plates for the formation of vacuum chamber respectively, two pieces of low carbon steel plates for the formation of vacuum chamber are carried out flanging shaping, make weather strip at edge weld, and make supporter or extract opening on one piece of low carbon steel plate or on central layer or on dividing plate; Each block of plate makes bleed-off passage and installing hole;

Second step, first by the weld coated glass solder of the lower low carbon steel plate in two pieces of low carbon steel plates, again central layer and dividing plate are placed on consistency from top to bottom between two pieces of low carbon steel plates to be combined, then send in edge sealing heating furnace, by the heat fused of glass solder, cooling solidification, the edge of two pieces of low carbon steel plates is hermetic welded together; Vacuum chamber after edge sealing is joined together to form composite plate by welding or bonding mode and panel; In extract opening, place solder, composite plate is sent in vacuum drying oven, once can send into one to several piece;

3rd step, first vacuum drying oven is warming up to the temperature of bleeding, again vacuum drying oven is evacuated to below 0.1Pa, then vacuum drying oven is warming up to the temperature of sealing, solder fusing is by extract opening self-closed, with stove cooling, solder solidify rear to vacuum chamber realize tightness welding, open the composite evacuated plate of two vacuum layer that vacuum drying oven obtains weather strip and installing hole.

Wherein, the composite evacuated plate of two vacuum layer of weather strip and installing hole is had to comprise the various forms of sheet materials such as surface plate, curved slab, bending plate, sketch plate described in.

Wherein, the composite evacuated plate of two vacuum layer of weather strip and installing hole is had can also to have connector for installing or groove or hole etc. described in.

Wherein, the composite evacuated plate of two vacuum layer of weather strip and installing hole or the surrounding of vacuum chamber is had to scribble fluid sealant or structure glue described in.

Wherein, described panel is metal sheet, ceramic wafer, glass plate, plastic plate or composite plate etc., can have decoration, overcoat above it and on the soffit of vacuum chamber, as coating, electrodeposited coating, F-C paint etc.;

Further, the preferred ultra thin plate of described panel, with weight reduction and cost;

Further, described panel can be commaterial, also can be two kinds of different materials.

Wherein, described panel can connect as one with vacuum chamber before vacuumizing or in vacuum or after vacuumizing.

Wherein, the surface of described central layer can be coated with low-radiation film, as aluminium film etc.

Wherein, described bonding employing bonding adhesive, described bonding adhesive comprises organic gel, inorganic glue and composite adhesive, is commercially available prod; Described organic gel comprises thermosetting cement, PUR etc., and preferred resistant to elevated temperatures bonding adhesive, as phenolic resins, epoxy resin, organic siliconresin etc.

Wherein, described central layer can be one to several layers;

Wherein, described vacuum chamber is the air-tight cavity be welded by a piece or two pieces of low carbon steel plates, and the C content of described low carbon steel plate is not more than 0.06%, preferred enamel low carbon steel plate, and thickness is 0.3-3mm, preferred 0.3-1mm.

Wherein, described vacuum chamber can be one to several, and when described vacuum chamber is two, upper and lower two vacuum chambers stack bonding along the diagonal dislocation of lower upper surface, make it form overlap edge, to reduce edge cold bridge impact when described composite evacuated plate is installed.

Wherein, the low carbon steel plate of described vacuum chamber can adopt mirror board, if its surface is senior finish, or its inner surface makes it have extremely low emissivity, as aluminizer etc. through process.

Wherein, the inwall of described vacuum chamber can have coating that is heat insulation, sound insulation; Can have getter in described vacuum chamber, getter is automatic activation under high temperature, high vacuum.

Wherein, the edge weld of described low carbon steel plate has weather strip, and described weather strip is made up of glass or metal etc.;

Further, when described weather strip is made up of glass, preferably cryogenic glass powder is produced on described low carbon steel plate by modes such as printing, printing, sprayings and forms through high temperature sintering, can carry out separately sintering, also can sintering together with glass solder; The fusion temperature of described cryogenic glass powder is higher than the welding temperature of described glass solder;

Further, can be the metal sheet, the bar that are welded on separately on described low carbon steel plate when described weather strip is metal, also can be described low carbon steel plate flanging; Can only be connected with one piece of low carbon steel plate when described weather strip is metal sheet, bar, cold bridge can not be formed in described vacuum chamber;

Further, described weather strip forms an airtight bar frame at the weld of described low carbon steel plate, described weather strip has two airtight bar frames at least at the edge weld of lower low carbon steel plate of the described vacuum chamber of composition, described glass solder is positioned in the region that described two airtight bar frames surround, described weather strip has an airtight bar frame at least at the edge weld of upper low carbon steel plate of the described vacuum chamber of composition, and the weather strip of described upper low carbon steel plate can insert between two weather strips of described lower low carbon steel plate.

Wherein, described dividing plate is low carbon steel plate, glass plate, ceramic wafer or resistant to elevated temperatures high polymer plate.

Wherein, described dividing plate can be integrally welded with the inwall of vacuum chamber, makes vacuum chamber form two independently vacuum layer; Described dividing plate also can be placed directly in vacuum chamber, makes vacuum chamber form the vacuum layer of Liang Ge UNICOM.

Wherein, described dividing plate is that mirror board or its surface are coated with low-radiation film.

Wherein, described glass solder refers to and utilizes glass solder at high temperature to be welded together by two pieces of low carbon steel plates, commercially available low temperature glass solder selected by described glass solder, and its welding temperature is generally 380-480 DEG C, selects low temperature glass solder to be conducive to reducing costs, improving production capacity etc.; Described glass solder, certain pressure can be applied, namely pressure welding is carried out, with make welding and combine more solid and reliable, vacuum chamber and plate face more smooth, and can eliminate because solder thickness is uneven, vacuum chamber surface irregularity can not get supporter and evenly effectively supports and the edge sealing stress that causes; Described pressure is approximately 0.1MPa, described in the mode of exerting pressure can adopt mechanical compression, air pressure or hydraulic pressure etc.

Wherein, described extract opening or installing hole have one to several.

Wherein, described extract opening can directly be pressed in shell upper punch, also first can make extract opening and be welded on shell again.

Wherein, described vacuum layer can share an extract opening or each vacuum layer respectively has an extract opening.

Wherein, described edge sealing heating furnace or vacuum drying oven are the single-unit furnaces of batch production, or the tunnel kiln that continous way is produced; The edge sealing temperature of described edge sealing heating furnace is 360-500 DEG C, is preferably 380-480 DEG C; The vacuum of described vacuum drying oven is 0.001-0.1Pa, is preferably 0.005-0.05Pa; The sealing temperature of described vacuum drying oven is 150-450 DEG C, is preferably 280-350 DEG C.

Wherein, above support can be the supporter made separately, also can be the projection directly formed on the low carbon steel plate making vacuum chamber or on central layer or on dividing plate, as point, line etc.;

Further, when above support makes separately, be point, line or the net etc. that adopt the materials such as metal, glass, pottery, high polymer to make.

Wherein, above support has one to several layers.

Wherein, above support can directly be produced on described dividing plate, also can form one with the inwall of described vacuum chamber or central layer by punching press, roll extrusion and welding, the mode such as bonding.

The invention has the beneficial effects as follows:

The present invention adds weather strip at the weld of glass solder, weather strip not only can limit the rear random flowing of glass solder fusing, make edge sealing neatly good-looking, prevent the solder skip phenomenon caused because glass solder runs off, the qualification rate improving product, and the plane-welding of glass solder can be become three-dimensional welding, make welding more firmly, reliably, the tightness of vacuum chamber is fine, the longer service life of evacuated panel; The present invention replaces metal () to weld with glass solder, coefficient of thermal conductivity due to glass only has 1% of metal even less so can solve the edge cold bridge problem of evacuated panel well, because glass is different with the material of metal so the evacuated panel of glass solder has better sound insulation value; The low carbon steel plate matched with coefficient of thermal expansion and glass solder replaces conventional metal sheet, solves the Welding Problems between glass and metal; An about atmospheric pressure is applied when glass solder, glass solder is made to solidify the sizing of final vacuum chamber in using state, eliminate edge sealing stress, avoid the evacuated panel in use damage that causes because of unbalance stress of brittle glass solder, thus ensure that heat-proof quality and the application life of evacuated panel; The composite evacuated plate of two vacuum layer by weather strip and installing hole of the present invention forms primarily of metal material, and panel can select inorganic material or fire proofing, so have good fireproof performance; Of the present invention have its panel of the composite evacuated plate of two vacuum layer of weather strip and installing hole can select multiple decorative panel, so have good decorative effect, do not need to do decorative layer again after installation, not only saves material and also save manpower and time; Of the present invention have the composite evacuated plate of two vacuum layer of weather strip and installing hole to be composited by multiple material, so not only thickness is thin, lightweight, and has very high mechanical strength; Of the present invention have its vacuum chamber of the composite evacuated plate of two vacuum layer of weather strip and installing hole to be divided into two by dividing plate to form two vacuum layer, the cost of increase and operation little, but effectively can improve heat insulation, sound insulation and the mechanical performance of composite evacuated plate; Of the present invention have the composite evacuated plate of two vacuum layer of weather strip and installing hole to adopt normal temperature and pressure lower sealing edge, high-temperature vacuum lower sealing, installing hole and extract opening unite two into one, its manufacture craft is simple, cost of production is low, can mechanization, automation, production in enormous quantities, product can be widely used in interior wall, exterior wall and curtain wall, the consumption that can greatly reduce material and the energy, the weight alleviating building, shortening building cycle; Of the present invention have the composite evacuated plate of two vacuum layer of weather strip and installing hole not only can be applied to new building, and the energy-conservation of existing building and outward appearance transformation can be applied to, installing hole can have one to several, not only can wet combining but also can be cladding, can greatly save the engineering time compared with existing heat insulating material, improve heat insulation and soundproof effect; Of the present invention have the composite evacuated plate of two vacuum layer of weather strip and installing hole to make sketch plate, is directly used in the production of refrigerator, refrigerator-freezer, refrigerator carriage, incubator, cold store, frozen products insulated container etc.; High-temperature field can also be used for, as the Surgery therapy etc. of various body of heater.

Accompanying drawing explanation

Fig. 1 of the present inventionly has the composite evacuated plated construction schematic diagram of two vacuum layer of weather strip and installing hole.

In figure: 1. panel, 2. central layer, 3. vacuum chamber, 4. supporter, 5. dividing plate, 6. extract opening and installing hole, 7. solder, 8. glass solder, 9. weather strip.

Detailed description of the invention

See accompanying drawing, there is the composite evacuated plate of two vacuum layer of weather strip and installing hole by panel 1, central layer 2, vacuum chamber 3, supporter 4 and dividing plate 5 form, panel 1 is metal sheet, ceramic wafer, glass plate, plastic plate or composite plate, the armorplate glass that preferred 3-5mm is thick, ceramic wafer, stone plate, artificial stone plate or Aluminiumplastic composite panel etc., and be pasted onto on the upper surface of vacuum chamber 3 by high temperature adhesive, high temperature adhesive can select the resistant to elevated temperatures phenolic resin glue of normal temperature or hot setting, epoxide-resin glue, the organic adhesion agents such as organic siliconresin glue and polyimides and conventional inorganic adhesive or organo-mineral complexing bonding adhesive etc., central layer 2 is metal sheet, ceramic wafer, glass plate, plastic plate or composite plate, the aluminium alloy plate that the armorplate glass that preferred 3-4mm is thick, 1-2mm are thick or fiber composite plate etc., the low carbon steel plate that vacuum chamber 3 is 0.3-1.0mm by thickness is welded, dividing plate 5 can adopt same sheet material, directly weld together with vacuum chamber 3, the mechanical performance of vacuum chamber 3 can be increased, dividing plate 5 also can adopt glass plate, plastic plate etc., be placed directly in vacuum chamber 3, make vacuum chamber 3 form the vacuum layer of Liang Ge UNICOM, supporter 4 is made up of metal, pottery, glass or high polymer, modes such as utilizing printing, print, spray, machinery lays is that dot matrix is distributed on two surfaces up and down of dividing plate 5, the bearing height of supporter 4 is advisable with 0.15-1.0mm, and the diameter of the strong point is advisable with 0.3-1.0mm, metal annular groove on the air exhaust nozzle that extract opening 6 is directly stamped out by the upper low carbon steel plate of vacuum chamber 3 and lower low carbon steel plate forms, place solder 7 in metal annular groove as tin, zinc, magnesium and low-melting alloy thereof, solder 7 dissolves and automatically to seal extract opening 6 afterwards, installing hole 6 and the same hole of air exhaust nozzle, through the whole pair of composite evacuated plate of vacuum layer.There is the preparation method of the composite evacuated plate of two vacuum layer of weather strip and installing hole as follows: the low carbon steel plate that first cutting two pieces is onesize is for making vacuum chamber 3, and it is shaping and make extract opening and installing hole 6 to utilize the mode of punching press to carry out flanging to two pieces of low carbon steel plates, the low carbon steel plate that cutting one piece is more smaller again as dividing plate 5 and reserved bleed-off passage and installing hole 6, by the mode of printing or spray take cryogenic glass powder as raw material weather strip 9 be printed on low carbon steel plate edge weld, supporter 4 is printed on two surfaces up and down of dividing plate 5; Secondly cutting one piece of glass plate is as central layer 2, and is treated as tempered glass through punching and tempering; By the weld coated glass solder 8 of the lower low carbon steel plate in two pieces of low carbon steel plates, again central layer 2 and dividing plate 5 are placed between two pieces of low carbon steel plates, two pieces of low carbon steel plate consistencies from top to bottom are combined, then send in edge sealing heating furnace, the edge sealing temperature of edge sealing heating furnace is 400-450 DEG C, by the heat fused of glass solder 8, cooling solidification, the edge of two pieces of low carbon steel plates is hermetic welded together, complete edge sealing; Again get one piece of aluminium alloy plate as panel 1, aluminium alloy plate has installing hole 6, choose epoxide-resin glue as bonding adhesive, upper surface panel 1 being pasted onto vacuum chamber 3 forms composite plate; Finally place solder 7 at extract opening 6 place, one piece or composite plate are in batch sent in vacuum drying oven, first heating makes epoxy resin adhesive curing, be evacuated to below 0.1Pa again, temperature when vacuumizing is preferably more than 300 DEG C, to promote the eliminating of gas in vacuum chamber 3, after vacuum reaches, be warming up to sealing temperature again, solder 7 melts extract opening 6 self-closed, with stove cooling, solder 7 solidifies final vacuum chamber 3 and realizes airtight sealing, opens the composite evacuated plate of two vacuum layer that vacuum drying oven obtains weather strip and installing hole; In order to protect the impact of vacuum chamber 3 and elimination heat bridge, the surrounding of vacuum chamber 3 can smear fluid sealant or structure glue; In order to protect panel 1 and play decoration function, fluid sealant smeared by bleed-off passage can brushing F-C paint with the soffit of installation protective casing, vacuum chamber 3.

All above-mentioned this intellectual properties of primary enforcement, not setting restriction this new product of other forms of enforcement and/or new method.Those skilled in the art will utilize this important information, and foregoing is revised, to realize similar implementation status.But all modifications or transformation belong to the right of reservation based on new product of the present invention.

The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.

Claims (10)

1. one kind has the composite evacuated plate of two vacuum layer of weather strip and installing hole, comprise panel, central layer and vacuum chamber, it is characterized in that installing hole and extract opening unite two into one, described installing hole is through whole composite plate, described panel is fixed on the upper surface outside described vacuum chamber by welding or bonding mode, described central layer is placed on the bottom in described vacuum chamber, described panel and or described central layer provide additional strength for described vacuum chamber, ensure vacuum chamber planarization under atmospheric pressure, described vacuum chamber welds edge sealing by low carbon steel plate at constant-pressure and high-temperature lower-glass, high temperature seals and the closed cavity of formation under vacuo, the edge weld of described low carbon steel plate has weather strip, the coefficient of thermal expansion of described low carbon steel plate and described glass solder matches, described sealing utilizes solder according to hydraulic seal principle automatic-sealed in a vacuum furnace pre-extract opening on vacuum chamber, described solder comprises low-temperature metal and solder, a dividing plate is had in described vacuum chamber, described dividing plate forms two vacuum layer by being divided into two in described vacuum chamber, have supporter in described vacuum layer, above support makes separately or directly formed on vacuum chamber or dividing plate or central layer.

2. there is the composite evacuated plate of two vacuum layer of weather strip and installing hole as claimed in claim 1, described in it is characterized in that, have the composite evacuated plate of two vacuum layer of weather strip and installing hole to comprise surface plate, curved slab, bending plate and sketch plate.

3. there is the composite evacuated plate of two vacuum layer of weather strip and installing hole as claimed in claim 1, it is characterized in that described panel or described central layer are metal sheet, ceramic wafer, glass plate, plastic plate or composite plate.

4. there is the composite evacuated plate of two vacuum layer of weather strip and installing hole as claimed in claim 1, it is characterized in that the surface of described central layer can be coated with low-radiation film.

5. there is the composite evacuated plate of two vacuum layer of weather strip and installing hole as claimed in claim 1, it is characterized in that described vacuum chamber has one to several, when described vacuum chamber is two, upper and lower two vacuum chambers stack bonding along the diagonal dislocation of lower upper surface, it is made to form overlap edge, to reduce edge cold bridge impact during installation.

6. there is the composite evacuated plate of two vacuum layer of weather strip and installing hole as claimed in claim 1, it is characterized in that described dividing plate is low carbon steel plate, glass plate, ceramic wafer or resistant to elevated temperatures high polymer plate.

7. there is the composite evacuated plate of two vacuum layer of weather strip and installing hole as claimed in claim 1, it is characterized in that described dividing plate can be integrally welded with the inwall of vacuum chamber, make vacuum chamber form two independently vacuum layer; Described dividing plate also can be placed directly in vacuum chamber, makes vacuum chamber form the vacuum layer of Liang Ge UNICOM.

8. there is the composite evacuated plate of two vacuum layer of weather strip and installing hole as claimed in claim 1, it is characterized in that described glass solder is pressure welding.

9. there is the composite evacuated plate of two vacuum layer of weather strip and installing hole as claimed in claim 1, it is characterized in that the inwall of described vacuum chamber can have coating that is heat insulation, sound insulation, in described vacuum chamber, have getter.

10. the preparation method having the composite evacuated plate of two vacuum layer of weather strip and installing hole described in any one of claim 1 to 9, is characterized in that comprising the following steps:

The first step, the have shape of the composite evacuated plate of two vacuum layer of weather strip and installing hole and size according to required making make one piece of panel, one piece of central layer, one piece of dividing plate and two pieces of low carbon steel plates for the formation of vacuum chamber respectively, two pieces of low carbon steel plates for the formation of vacuum chamber are carried out flanging shaping, make weather strip at edge weld, and make supporter or extract opening on one piece of low carbon steel plate or on central layer or on dividing plate; Each block of plate makes bleed-off passage and installing hole;

Second step, first by the weld coated glass solder of the lower low carbon steel plate in two pieces of low carbon steel plates, again central layer and dividing plate are placed on consistency from top to bottom between two pieces of low carbon steel plates to be combined, then send in edge sealing heating furnace, by the heat fused of glass solder, cooling solidification, the edge of two pieces of low carbon steel plates is hermetic welded together; Vacuum chamber after edge sealing is joined together to form composite plate by welding or bonding mode and panel; In extract opening, place solder, composite plate is sent in vacuum drying oven, once can send into one to several piece;

3rd step, first vacuum drying oven is warming up to the temperature of bleeding, again vacuum drying oven is evacuated to below 0.1Pa, then vacuum drying oven is warming up to the temperature of sealing, solder fusing is by extract opening self-closed, with stove cooling, solder solidify rear to vacuum chamber realize tightness welding, open the composite evacuated plate of two vacuum layer that vacuum drying oven obtains weather strip and installing hole.