NZ741346A - Hot-air oxygen-free brazing system - Google Patents
Hot-air oxygen-free brazing systemInfo
- Publication number
- NZ741346A NZ741346A NZ741346A NZ74134617A NZ741346A NZ 741346 A NZ741346 A NZ 741346A NZ 741346 A NZ741346 A NZ 741346A NZ 74134617 A NZ74134617 A NZ 74134617A NZ 741346 A NZ741346 A NZ 741346A
- Authority
- NZ
- New Zealand
- Prior art keywords
- hot
- fan
- air oxygen
- furnace body
- free brazing
- Prior art date
Links
- 229920002456 HOTAIR Polymers 0.000 title claims abstract description 63
- 238000005219 brazing Methods 0.000 title claims abstract description 59
- 238000001816 cooling Methods 0.000 claims description 90
- 238000009413 insulation Methods 0.000 claims description 54
- 238000010438 heat treatment Methods 0.000 claims description 53
- 238000005192 partition Methods 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 18
- HBMJWWWQQXIZIP-UHFFFAOYSA-N Silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 15
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 claims description 14
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims description 14
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 239000010431 corundum Substances 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 239000011733 molybdenum Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052721 tungsten Inorganic materials 0.000 claims description 6
- 239000010937 tungsten Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 230000003044 adaptive Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 60
- 239000010410 layer Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 12
- 238000007789 sealing Methods 0.000 description 9
- 210000002268 Wool Anatomy 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- PZZYQPZGQPZBDN-UHFFFAOYSA-N Aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000006011 modification reaction Methods 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 210000003660 Reticulum Anatomy 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000001681 protective Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N Tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
Disclosed is a hot-air oxygen-free brazing system, including a furnace body and a hot-air circulation system. Under an oxygen-free environment, the hot-air circulation system leads gas into a working chamber of the furnace body and cyclically heats a workpiece under the condition of brazing. The hot-air oxygen-free brazing system of the present invention is good in temperature uniformity, high in brazing quality, long in service life, and wide in application range. -air oxygen-free brazing system of the present invention is good in temperature uniformity, high in brazing quality, long in service life, and wide in application range.
Description
HOT-AIR OXYGEN-FREE BRAZING SYSTEM
Technical Field
The present invention relates to the field of brazing technologies, and particularly to a
hot-air oxygen-free brazing system.
Related Art
When brazing a workpiece, most of the existing vacuum brazing furnaces adopt a
radiative-convective heating mode. This heating mode is low in heating speed, and easily
leads to non-uniform heating of the workpiece, thereby generating thermal deformation,
greatly increasing the defective rate, shortening the service life, and increasing the
production costs. Hot-air heating modes also exist in the prior art. However, for some
modes, hot-air circulation cannot be carried out, i.e., gas enters an inlet but exits from an
outlet; and for some other modes, a brazing temperature is low, basically less than 450 ℃,
and therefore the material and structure of equipment are not highly required, so a brazing
furnace is poor in universality, and can only be applied to a workpiece brazed at the
temperature less than 450 ℃. Moreover, due to not high temperature, even if a fan is
disposed in the furnace, the fan cannot be greatly affected, and therefore the structure of the
fan is not highly required.
Therefore, the foregoing furnace body cannot be applied to a workpiece brazed at the
temperature more than 450 ℃.
SUMMARY
In view of the foregoing disadvantages of the prior art, the present invention is directed
to provide a hot-air oxygen-free brazing system that is good in temperature uniformity, long
in service life, and wide in application range.
The technical solution of the present invention is as follows. A hot-air oxygen-free
brazing system includes a furnace body and a hot-air circulation system. Under an
oxygen-free environment, the hot-air circulation system leads gas into a working chamber
of the furnace body and cyclically heats a workpiece under the condition of brazing.
Further, the hot-air circulation system is of an external circulation structure, a heating
body is disposed outside the furnace body, and the heating body is connected to an inlet and
an outlet of the furnace body via a circulation pipeline.
Further, the hot-air circulation system is of an internal circulation structure, a heating
zone is disposed inside the furnace body, the heating zone is communicated with the
working chamber, and a power device leads gas passing through the heating zone into the
working chamber to form a hot-air circulation channel.
Further, the heating zone and the working chamber are disposed in a same cavity, and
partitioned by a partition plate; or the heating zone and the working chamber are
independent cavities, respectively.
Further, the hot-air circulation system leads gas into an inner chamber of the workpiece
and heats the workpiece.
Further, the power device is a fan, the fan being disposed inside or outside the furnace
body, or the fan being partially disposed inside the furnace body and partially disposed
outside the furnace body.
Further, when the structure of the fan is disposed inside the furnace body partially or
entirely, the fan is a high-temperature fan, the high-temperature fan includes a shaft and a
main cooling body, and a part, extending into the working chamber, of the shaft is wrapped
by the main cooling body.
Further, the high-temperature fan resists a temperature of not lower than 450 ℃.
Further, the high-temperature fan resists a temperature of not lower than 600 ℃.
Further, the main cooling body is a hollow housing made of a
high-temperature-resistant material, and the part, extending into the working chamber, of
the shaft penetrates through an inner chamber of the housing; or the main cooling body is a
shaft seat, a shaft body inner chamber of the shaft seat is hollow, a water cooling jacket is
disposed in the inner chamber of the shaft seat to form a water cooling shaft seat, and the
part, extending into the working chamber, of the shaft penetrates through the inner chamber
of the shaft seat.
Further, rollers are disposed in the working chamber, each roller is installed on a roller
holder, and a bottom plate is placed on the rollers.
Further, a rapid cooling fan is disposed outside a furnace cover of the furnace body, the
rapid cooling fan being communicated with the working chamber.
Further, a heat exchanger is disposed outside a furnace cover of the furnace body, the
inner side of the furnace cover is communicated with the heat exchanger via a pipeline, and
a cooling medium is fed into the pipeline.
Further, an upper part and/or lower part of a furnace cover of the furnace body are/is
provided with a thermal insulation door(s).
Further, the thermal insulation door is opened electrically or adaptively.
Further, the adaptive structure is: the thermal insulation door is disposed at a cooling
blowing side or a cooling suction side, and is opened by cooling blowing or suction.
Further, the furnace body includes a liner, the liner adopting an integral liner or a
multi-section liner; and a thermal insulation layer is disposed on the liner.
Further, the partition plate adopts a multi-cavity grid structure; or the partition plate is
of a solid or hollow structure.
Further, the rollers and/or roller holders and/or bottom plate are made of at least one of
graphite, carbon-carbon, silicon carbide, corundum, molybdenum, and tungsten.
Further, the high-temperature fan is made of at least one of graphite, carbon-carbon,
silicon carbide, and heat-resistant steel.
The present invention has beneficial effects as follows. (1) The surface of a workpiece
and an inner chamber of the workpiece are cyclically heated by using hot air under an
oxygen-free environment, so that all points of the workpiece are approximate in
temperature, thereby greatly improving the quality of brazing. (2) A high-temperature fan
extending into a working chamber is cooled, so that on one hand, a shaft between a main
cooling body and a fan impeller can be shortened, thereby greatly improving the stability of
rotation of the fan impeller, and on the other hand, a part, extending into the working
chamber, of the shaft and a motor can be cooled and cannot be damaged due to
over-heating, thereby greatly prolonging the service life. (3) A liner is good in thermal
insulation, steady in structure, good in sealing performance and high in ductility. (4) A
cooling device on a furnace cover can rapidly cool the workpiece, and all components are
arranged reasonably, so that the size of a furnace body cannot be increased. (5) The hot-air
oxygen-free brazing system can be applied to brazing of any workpiece.
BRIEF DESCRIPTION OF THE DRAWINGS
is a structure diagram illustrating an external circulation structure of a hot-air
circulation system according to the present invention;
is a structure diagram illustrating a specific implementation for an internal
circulation structure of a hot-air circulation system according to the present invention;
is a structure diagram illustrating another specific implementation for an
internal circulation structure of a hot-air circulation system according to the present
invention;
is a structure diagram illustrating a partition plate according to the present
invention;
is a structure diagram illustrating a connection between two partition plates
according to the present invention;
is a structure diagram illustrating a specific implementation for a fan according
to the present invention;
is a structure diagram illustrating structure and internal configurations of a liner
according to the present invention;
is a structure diagram illustrating a furnace cover according to the present
invention;
is a structure diagram illustrating a specific implementation for a workpiece
structure according to the present invention;
is a structure diagram illustrating a workpiece adopting hot-air internal
circulation according to the present invention;
is a structure diagram illustrating a workpiece adopting hot-air external
circulation according to the present invention; and
is a structure diagram illustrating another specific implementation for a
workpiece structure according to the present invention.
DETAILED DESCRIPTION
The present invention will be further elaborated hereinbelow in conjunction with the
accompanying drawings of the specification and specific embodiments.
A hot-air oxygen-free brazing system includes a furnace body and a hot-air circulation
system. Under an oxygen-free environment, the hot-air circulation system leads gas into a
working chamber of the furnace body and cyclically heats a workpiece under the condition
of brazing.
The brazing refers to: a melting point of a solder for brazing is more than or equal to
450 ℃.
The technical solution has the following advantages: (1) in the present invention,
high-temperature brazing is performed in an oxygen-free environment, so that inflammable
gas can be prevented from entering a working chamber to come into contact with oxygen at
a high temperature to cause an explosion and the like, thereby improving safety and
reducing costs; and (2) a workpiece is cyclically heated by using hot air, so that on one
hand, the heating time can be shortened, and on the other hand, the workpiece can be
directly filled with hot gas so as to be more uniformly heated, thereby greatly improving the
quality of brazing of the workpiece.
The hot-air circulation system includes at least a power device for leading hot gas into
the working chamber and a heating body for heating the gas.
The heating body may be a heater, a resistance wire, or the like.
At least a gas supply device for conveying gas to be heated, protective gas, reducing
gas, or the like needs to be disposed outside the furnace body.
The structure of the hot-air circulation system will be described hereinbelow.
The hot-air circulation system may be of two structures, the first structure being an
external circulation structure.
As shown in a specific implementation for the external circulation structure is:
a heating body 2 is disposed outside a furnace body 1, the heating body 2 is connected to an
inlet and an outlet of the furnace body 1 via a circulation pipeline 3, and at least one power
device 4 may be disposed at one side of the furnace body 1. The power device 4 leads gas
passing through the heating body 2 into a working chamber, and the heat-exchanged gas
flows from the outlet into the circulation pipeline again to cyclically heat a workpiece 6.
On the above basis, the present invention may be further provided with a cooler 5
disposed outside the furnace body, cooled gas cyclically cooling the workpiece. For
example, the heating body and the cooler are connected to a circulation pipeline separately
to work independently without influencing each other; or the heating body and the cooler
are connected to two branches of a circulation pipeline; or the heating body and the cooler
are connected to two branches of a circulation pipeline, namely a heating branch and a
cooling branch, a front electrically operated valve and a rear electrically operated valve
being disposed at a junction between the heating branch and the cooling branch to switch a
hot gas channel and a cold gas channel.
The hot-air circulation system is set to be of the external circulation structure, so that
other components or structure designs in the working chamber can be saved, the structure is
greatly simplified, and the size of the furnace body may be designed to be smaller.
The second structure of the hot-air circulation system is an internal circulation
structure.
A specific implementation for the internal circulation structure is: a circulation pipeline
and a heating body are disposed in a working chamber, and a workpiece is cyclically heated
via the circulation pipeline.
A second specific implementation for the internal circulation structure is: a heating
body is disposed inside a furnace body, the heating body is communicated with a working
chamber, and a power device leads gas passing through the heating body into the working
chamber to form a hot-air circulation channel. Compared with the foregoing structure of
arranging the circulation pipeline in the working chamber, the structure is better in effect.
Requirements of high-temperature brazing for a pipeline are severe, so that the costs will be
greatly increased; moreover, the structure of the working chamber will be complicated, and
the circulation pipeline will affect the quality of brazing.
For example, as shown in a heating body 2 and a working chamber 7 are
disposed in a same cavity, and partitioned by a partition plate 8. Heated gas flows into the
working chamber 7 along the partition plate 8 to heat a workpiece, and flows to the position
of the heating body 2 again along the partition plate 8 to cyclically heat under the action of
a power device.
For another example, as shown in a heating body 2 and a working chamber 7
are independent cavities, respectively. Heated gas flows into the working chamber 7 to heat
a workpiece 6, and returns to a heating zone to cyclically heat under the action of a power
device.
The situation of the partition plate will be described hereinbelow.
The working chamber is partitioned, by the partition plate, into two parts namely a
heating zone and a workpiece brazing zone. The partition plate may adopt a multi-cavity
grid structure, a solid structure or a hollow structure.
There may be one partition plate, or there may be a plurality of partition plates that are
spliced.
As shown in and a specific implementation of splicing a plurality of
partition plates 8 is: each of the plurality of partition plates 8 adopts a grid structure, that is,
an inner chamber of each partition plate consists of a plurality of cavities 81 arranged to
form a gas channel. The end size of one partition plate 8 is reduced, so the reduced section
may be sheathed in the inner chamber of another partition plate 8. A hole is provided at a
connected position between every two adjacent partition plates, the holes are opposite to
each other, and the adjacent partition plates are connected via a bolt 82 after a sleeved
connection. The entire partition plate 8 and a liner of the furnace body are fixed via a bolt.
The partition plate may be made of a carbon-carbon material, silicon carbide,
corundum, stainless steel, copper, or another high-temperature-resistant material. The
surface of the partition plate is provided with a silicon carbide coating.
When the partition plate adopts the multi-cavity grid structure, a grid direction is
parallel to the partition plate, and the workpiece may be placed over, below or beside the
partition plate. When the workpiece is placed over the partition plate, the workpiece can be
directly heated due to feeding of hot gas into grids of the partition plate, and meanwhile,
hot-air circulation heating is also carried out, thereby greatly improving the brazing
efficiency. When the workpiece is placed below or beside the partition plate, hot gas inside
the partition plate and outside the partition plate can be led to the workpiece via a power
device to perform heat circulation.
The situation of the power device will be described hereinbelow.
The power device is a fan. The fan may be an air blower, a draft fan, or the like. A fan
impeller may be a centrifugal impeller, an axial-flow impeller, a diagonal-flow impeller, a
mixed-flow impeller, or a multi-stage impeller.
The fan may be disposed inside or outside the furnace body, or the fan is partially
disposed inside the furnace body and partially disposed outside the furnace body.
When the structure of the fan is disposed inside the furnace body partially or entirely,
the fan is a high-temperature fan, a main cooling body is disposed on the high-temperature
fan, and a part, extending into the working chamber, of the structure is wrapped by the
main cooling body.
The high-temperature fan resists a temperature of 450 ℃ or above. Preferably, the
high-temperature fan resists a temperature of 600 ℃ or above. More preferably, the
high-temperature fan resists a temperature of 800 ℃ or above. Further preferably, the
high-temperature fan resists a temperature of 1,000 ℃ or above. Furthermore preferably, the
high-temperature fan resists a temperature of 1,500 ℃ ℃ or above.
As shown in a specific implementation for a fan in the present invention is: the
whole fan is disposed inside a working chamber, a fan 9 includes an impeller and a motor
91 driving the impeller to act, the impeller is a centrifugal impeller, preferably, that is, the
fan 9 is a high-temperature centrifugal fan. A housing of the motor 91 is provided with a
water cooling jacket 92, the front end of the water cooling jacket 92 wrapping a motor shaft
93 conically. Short pipes 94 are disposed at the upper and lower parts of the water cooling
jacket 92, wherein the short pipes 94 may be threading connectors or may be other
connectors, and serve as a water outlet and a water inlet of the water cooling jacket. A
flange 95 is disposed at the rear end of the housing of the motor, and the surface of the
flange is smooth or provided with an annular groove. A rubber sealing ring is installed in
the annular groove. A ventilation pipeline 96 is disposed on the motor 91, and the
ventilation pipeline 96 connects the exterior of a furnace body to the interior of the motor,
and can perform heat dissipation or cooling on the motor 91. The ventilation pipeline 96
may be installed on a rear cover of the motor, or may be installed on the water cooling
jacket of the motor. The front end of the motor shaft is completely sleeved by the water
cooling jacket, a gap being 0.1mm or above.
An installation seat of the motor 91 is fixed to the water cooling jacket 92 via an
installation flange. At least one sealing groove is provided on the installation flange. A
bayonet of the motor is disposed on the installation flange. Rib plates are arranged in the
water cooling jacket at intervals, and the rib plates may be disposed annularly or
longitudinally.
Another specific implementation for the fan in the present invention is: a motor of the
fan is disposed outside a working chamber, and a part of a shaft of the motor and an
impeller are located in the working chamber. A main cooling body is disposed at a position
close to the fan impeller, a water cooling jacket is disposed in an inner chamber of the main
cooling body, and the part, extending into the working chamber, of the shaft penetrates
through the inner chamber of the main cooling body.
The main cooling body may be a shaft seat, a shaft body inner chamber of the shaft
seat is hollow, a water cooling jacket is disposed in the inner chamber of the shaft seat to
form a water cooling shaft seat, and the part, extending into the working chamber, of the
shaft penetrates through the inner chamber of the shaft seat. Or, the main cooling body is a
hollow housing made of a high-temperature-resistant material, a cooling medium is fed into
an inner chamber of the housing, and the part, extending into the working chamber, of the
shaft penetrates through the inner chamber of the housing.
According to the fan in the present invention, on the one hand, the main cooling body
moves forward, so that the shaft between the main cooling body and the fan impeller is
shortened, thereby greatly improving the stability of rotation of the fan impeller; and on the
other hand, the part, extending into the working chamber, of the shaft and the motor can be
cooled and cannot be damaged due to over-heating, thereby greatly prolonging the service
life.
A thermal insulation layer is also disposed outside the main cooling body and is used
to prevent heat in the furnace from being transferred to a water cooling jacket. The thermal
insulation layer may be a high-temperature-resistant coating applied to an outer wall of the
main cooling body, or may be a high-temperature-resistant thermal insulation material
disposed on the outer wall of the main cooling body. A thermal insulation material may be
also disposed beside the impeller. The thermal insulation material may be a carbon felt (soft
felt or hard felt), the carbon felt being wrapped by a shield made of carbon-carbon/silicon
carbide/corundum/molybdenum/tungsten.
The foregoing motor shaft is a solid shaft or a hollow shaft. When the motor shaft is
the hollow shaft, the hollow shaft may be filled with the thermal insulation material. For
example, the thermal insulation material is disposed at the end, connected to the fan
impeller, of the motor shaft. Due to over-high temperature of the fan impeller at high
temperature, the temperature of a junction between the shaft and the fan impeller is high,
and a large temperature difference of the junction can be prevented by means of the thermal
insulation material.
A fan housing and impeller of the high-temperature fan may be made of materials such
as a carbon-carbon material, graphite, silicon carbide, heat-resistant steel or the like, and a
fan housing substrate and an impeller substrate may adopt fiber needled green bodies or 3D
knitted green bodies. The fan shaft adopts a water cooling manner. A vacuum water cooling
shielded motor is adopted as the motor.
A specific implementation for the impeller is: after an entire circular ring of the
impeller is made of a carbon-carbon material, fan blades are completed by machining. The
fan blades, bottom plate and cover plate of the impeller are connected in an insertion
manner, junctions being fastened by using pins or screwed by using threads. Fan blade,
bottom plate and cover plate substrates of the impeller adopt fiber needled green bodies or
3D knitted green bodies.
The situation of the liner of the furnace body will be described hereinbelow.
The liner is disposed in the furnace body, and the foregoing working chamber is
encircled by the liner. The foregoing partition plate may partition the liner into two parts.
The liner adopts an integral liner or a multi-section liner, wherein sections of the
multi-section liner can be connected via grooved bending plates.
As shown in a specific implementation for a liner structure is: a liner 10 is of a
thermal insulation structure, and includes an inner thermal insulation shell 101, a thermal
insulation layer, and an outer thermal insulation shell 102.
The inner thermal insulation shell 101 is made of one of a carbon-carbon plate, a
silicon carbide plate, a corundum plate, a graphite plate, a molybdenum plate or a tungsten
plate. A panel of the inner thermal insulation shell is a single-layer flat plate or a hollow
grid plate. Seams of the panel are covered by a thin flat plate, and the thin flat plate is
adhered to a base material by using high-temperature glue, and compressed by using a bolt
103 made of carbon-carbon, graphite, molybdenum, tungsten or silicon carbide. The shear
strength of the high-temperature glue is greater than 5MPa.
The thermal insulation layer includes a ceramic wool layer 104 and a carbon felt layer
105, the carbon felt layer 105 being an inner layer, and the ceramic wool layer 104 being an
outer layer. The ceramic wool layer 104 may be replaced with an aluminum silicate wool
layer.
The outer thermal insulation shell 102 is made of one of stainless steel, carbon steel or
low-alloy steel. The surface of the outer thermal insulation shell 102 is provided with a
plurality of convex or concave holes. A steel plate of the outer thermal insulation shell 102
is connected to two sides of the holes to form a ripple-like telescopic structure.
Outer rollers 11 are installed at the lower part of the liner, the outer rollers 11 being
placed on a track of a furnace body 1. The upper part of the liner is connected to a furnace
top, a gap being reserved between the upper part of the liner and the furnace top.
The liner 10 is connected to the furnace body 1 via a supporting frame 12; or the liner
is connected to the furnace body via a cross bar by the supporting frame, a groove is
provided on the cross bar, and a connecting bolt is installed in the groove.
The situation of internal configurations of the liner will be described hereinbelow.
As shown in rollers 13 are disposed in an inner chamber, namely a working
chamber, of the liner 10.
A specific implementation for a roller structure is: a roller 13 is installed on a roller
holder 14. The roller holder 14 is installed on a supporting column 15, the supporting
column 15 is installed in a sleeve with threads, the threads are screwed in a base, and the
base is fixed to a liner 10. A shaft extends out of the roller 13, the shaft is inserted into a
bearing, and the bearing is fixed to a bearing block. The diameter of the roller 13 is greater
than the outer diameter of the bearing.
The roller, the bearing and the bearing block are all made of one of carbon-carbon,
silicon carbide or corundum. Both the roller holder and the supporting column are made of
one of graphite, carbon-carbon, silicon carbide, corundum, molybdenum or tungsten.
A bottom plate 16 is placed on the roller 14, and a workpiece may be placed on the
bottom plate 16 for pushing a workpiece in and out under the driving of the roller. The
bottom plate is made of one of graphite, carbon-carbon, silicon carbide, corundum,
molybdenum or tungsten. The bottom plate 16 may be of a multi-cavity grid structure, a
solid structure or a hollow structure; or the bottom plate is of a solid or hollow structure,
and a multi-cavity grid structure plate is placed on the solid or hollow bottom plate. There
may be one bottom plate 16, or there may be a plurality of partition plates that is spliced.
The upper and lower surfaces of the bottom plate are smooth.
A specific implementation of splicing a plurality of bottom plates is: the end size of
one bottom plate is reduced, so the reduced section may be sheathed in an inner chamber of
another bottom plate. A hole is provided at a connected position between every two
adjacent bottom plates, the holes are opposite to each other, and the adjacent bottom plates
are connected via a bolt after a sleeved connection. Both the inner and outer surfaces of the
bottom plate are provided with a silicon carbide coating separately.
The structure of a furnace cover will be described herein below.
A furnace cover is connected to at least one end of the furnace body, a cooling device
is disposed on the furnace cover, and the cooling device can cool the working chamber.
When furnace covers are disposed on both ends of the furnace body, a cooling device may
be disposed on one of the furnace covers.
A specific implementation for the cooling device is: a rapid cooling fan is disposed
outside the furnace cover, and the rapid cooling fan is communicated with the working
chamber in the furnace body via a pipeline. The furnace cover is provided with a thermal
insulation door, the thermal insulation door being disposed at a blowing side of the rapid
cooling fan. When the rapid cooling fan is not started, the thermal insulation door is not
opened. Only when the rapid cooling fan is operating, the thermal insulation door can be
blown to be opened, so that external wind is conveyed to the working chamber, thereby
cooling the brazed workpiece to make temperature reduced.
A second specific implementation for the cooling device is: a heat exchanger is
installed outside the furnace cover, the heat exchanger is of a tube-shell type structure, the
tube is filled with water, and gas needing to be cooled passes through the shell. A water
cooling jacket or a winding coil is disposed outside the heat exchanger. The interior of the
furnace body is communicated with the heat exchanger via a pipeline, the pipeline being a
water cooling jacket pipe. The furnace cover is provided with a thermal insulation door, the
thermal insulation door being opened by using an electric switch. After the thermal
insulation door is opened, water in the heat exchanger and water in the water cooling jacket
pipe cool passing gas, and the cooled gas enters the working chamber to cool the workpiece
to make temperature reduced.
As shown in a third specific implementation for the cooling device is: a rapid
cooling fan 201 and a heat exchanger 202 are disposed outside a furnace cover 20
simultaneously, the rapid cooling fan 201, the heat exchanger 202 and the working chamber
are communicated via a pipeline, a pipeline 203 between the rapid cooling fan 201 and the
heat exchanger 202 is not provided with a water cooling jacket, and the pipeline 203
between the heat exchanger 202 and the working chamber is a water cooling jacket pipe.
The furnace cover 20 is provided with two thermal insulation doors 204, one of the thermal
insulation doors 204 is disposed between the rapid cooling fan 201 and an inner chamber of
the furnace body 1, and the other thermal insulation door 204 is disposed between the heat
exchanger 202 and the inner chamber of the furnace body 1. The two thermal insulation
doors are disposed at a blowing side of the rapid cooling fan 201 and a suction side of a fan
9 in the furnace. The fan 9 is a high-temperature centrifugal fan. When the fan 9 operates to
heat a workpiece, none of the two thermal insulation doors 204 can be automatically
opened. Only when the rapid cooling fan 201 operates, the thermal insulation doors 204 can
be opened. Thus, water in the heat exchanger 202 and water in water cooling jacket pipe
cool passing gas, and the cooled gas is rapidly conveyed into the working chamber via the
rapid cooling fan 201 to cool the workpiece to make temperature reduced.
The thermal insulation doors 204 may be further provided with electric switches 205,
the thermal insulation doors being opened by using the electric switches.
The structure of a thermal insulation door will be described herein below.
As shown in a thermal insulation door 204 is connected to a door frame via a
hinge, the hinge being disposed above the center of gravity of the thermal insulation door
204. The thermal insulation door keeps close to the door frame under a free state. When the
thermal insulation door is disposed at the blowing side of the rapid cooling fan, the door
frame is disposed behind the thermal insulation door; and when the thermal insulation door
is disposed at the suction side of the rapid cooling fan, the door frame is disposed in front
of the thermal insulation door.
The door frame is provided with a sealing strip. The sealing strip is made of a flexible
material which may be a soft felt, ceramic wool felt or an aluminum silicate felt. The
sealing strip is clamped into a C-shaped clamping groove of the door frame in a Ω shape,
preferably. The C-shaped clamping groove may be made of stainless steel, carbon-carbon,
silicon carbide or the like. The sealing strip and the C-shaped clamping groove are disposed
at a low-temperature end of a high-temperature sealing face of the door frame. The other
face of the door frame is provided with a high-temperature material such as a soft felt,
ceramic wool felt or an aluminum silicate felt.
The amount of compression of the sealing strip is 10% or above.
The situation of brazing of a workpiece will be described hereinbelow.
The workpiece is of a structure enabling gas to flow into it and to flow out of it, and a
power device leads hot gas or cold gas into an inner chamber of the workpiece via a
circulation pipeline to cyclically heat or cool the workpiece.
As shown in a specific implementation for a workpiece structure is: a
workpiece 6A includes a first panel 61A, a second panel 62A and a plurality of core tubes
63A disposed therebetween.
The section of the core tube 63A is round or N-polygonal, where N≥3. Or, the section
is specially-shaped such as angular, I-shaped, concave or the like. The core tubes in the
present embodiment are circular tubes, preferably. The plurality of core tubes 63A is
arranged to form a through gas channel, copper solders 64A are disposed between the core
tubes 63A and the panels. The upper and lower ends of the core tube are provided with
flanges 65A.
As shown in , a specific implementation for hot-air internal circulation of the
above workpiece is: a workpiece 6A is disposed on a bottom plate 16 at the upper side of a
roller 13, and the roller 13 is disposed on a track. A heating body 2 and a working chamber
7 are partitioned by a partition plate 8. Both the bottom plate 16 and the partition plate 8 are
of a multi-cavity grid structure. The bottom plate 16 and the partition plate 8 are placed in
parallel to a furnace body, and a flowing direction of gas in grids is also parallel to the
furnace body. During brazing, protective gas is led to a heating zone by a fan 9, the fan 9
being a high-temperature centrifugal fan. The gas is heated into hot gas by the heating body
2, some entering the working chamber 7 along the partition plate, some entering a grid
chamber of the partition plate 8, and some entering a grid chamber of the bottom plate 16.
Thus, the surface of a first panel, the surface of a second panel and a cavity between the
two panels are heated by the hot gas, high-temperature gas runs through an inner chamber
of the workpiece and comes into contact with each core tube, so the upper, lower, left, right,
front and rear ends of the workpiece are approximate in temperature, thereby greatly
improving the temperature uniformity. Thus, the workpiece 6A cannot deform due to heat
difference. After brazing is completed, the fan 9 and the heating body 2 are closed, a rapid
cooling fan 201 is opened, the rapid cooling fan 201 blows to open a thermal insulation
door 204, water in a heat exchanger 202 and water in a water cooling jacket pipe cool
passing gas, the cooled gas is led into the furnace body by the rapid cooling fan 201, some
of cold gas enters the working chamber 7 along the bottom plate 16, some gas enters the
grid chamber of the bottom plate 16, and some gas enters the grid chamber of the partition
plate 8. Thus, the upper, lower, left, right, front and rear ends of the workpiece 6A are
approximate in temperature, thereby uniformly cooling the workpiece, improving the
quality of brazing, and cooling the partition plate and the bottom plate.
A specific implementation for hot-air external circulation of a workpiece is as follows.
As shown in , a heating body 2 and a cooler 5 are disposed outside a furnace
body 1, the heating body 2 and the cooler 5 are connected to an inlet and an outlet of the
furnace body 1 via a circulation pipeline 3, the heating body 2 and the cooler 5 are
connected to two branches of a circulation pipeline, namely a heating branch and a cooling
branch, a front electrically operated three-way valve 17 and a rear electrically operated
three-way valve 18 are disposed at a junction between two ends of the heating branch and
the cooling branch to switch a hot gas channel and a cold gas channel, and the openness of
the front electrically operated three-way valve 17 and the rear electrically operated
three-way valve 18 is adjustable, so that the flow of gas can be adjusted.
Thermal insulation layers are provided on the inner sides of housings of the front
electrically operated three-way valve 17 and the rear electrically operated three-way valve
18 respectively, and the thermal insulation layers are made of carbon felts, so that gas
entering the housings is in direct contact with the thermal insulation layers, instead of the
housings, for heat exchange, thereby ensuring the temperature of the gas.
A power device 4 such as a draft fan is disposed between the rear side of the outlet of
the furnace body and the circulation pipeline, and forcedly performs gas circulation, and the
flowing speed of the gas can be controlled via the rotating speed of the draft fan.
The heating body 2 can heat the gas into hot gas, the cooler 5 can cool the gas into cold
gas, and the hot gas or the cold gas is led into a furnace chamber along the circulation
pipeline via the draft fan and flows into the inner chamber of the workpiece 6. Baffles 19
are disposed between the upper and lower sides of the end, close to the outlet, of the
workpiece 6 and the working chamber, and the baffles 19 can seal a gap between the
workpiece 6 and the outlet, so as to ensure that the gas can only flow to the outlet from the
inner chamber of the workpiece 6 and cannot flow out from the upper and lower sides of
the workpiece 6. Thus, the defective rate can be greatly reduced. The gas flows into the
circulation pipeline 3 via the outlet to form a circulation channel.
As shown in , a specific implementation for the workpiece structure is: a
workpiece 6B includes a first panel 61B, a second panel 62B and a plurality of core plates
63B disposed therebetween.
The core plate 63B may be one of a wavy core plate, a corrugated core plate, a rib core
plate, a straight core plate, a grid core and a honeycomb core, or any combination thereof;
or the core plate consists of two symmetric wavy core plates, corrugated core plates or rib
core plates, and two core plates are connected into a whole face to face or back to back; or
the grid core includes a plurality of triangular or quadrangular grid channels; and the
honeycomb core includes a plurality of N-polygonal grid channels, where 5≤N≤30. The
core plates in the present embodiment are wavy core plates, preferably. The plurality of
core plates is arranged to form a through gas channel. Copper solders are disposed between
the core plates 63B and the panels.
In the present invention, the water cooling jacket is disposed on the furnace body, and
can cool the furnace body. The furnace body can bear a high pressure, brazing is performed
under the pressure of 0.1MPa or above, the pressure is measured by a pressure gage, and
the furnace pressure is controlled by controlling the openness ratio of an inlet valve to an
exhaust valve. The atmosphere of brazing is hydrogen and nitrogen, the content of the
hydrogen is 50% or above, the nitrogen enables the workpiece to be under an oxygen-free
environment in a brazing process, and the hydrogen protects the workpiece from being
oxidized in the brazing process.
Apparently, a person skilled in the art can make various changes and modifications on
the present invention without departing from the spirit and scope of the present invention.
Thus, if these changes and modifications for the present invention fall within the scope of
claims of the present invention and equivalent technologies thereof, the present invention
also contains these changes and modifications.
Claims (20)
1. A hot-air oxygen-free brazing system, comprising a furnace body and a hot-air circulation system, wherein under an oxygen-free environment, the hot-air circulation system leads gas into a working chamber of the furnace body and cyclically heats a 5 workpiece under the condition of brazing.
2. The hot-air oxygen-free brazing system according to claim 1, wherein the hot-air circulation system is of an external circulation structure, a heating body is disposed outside the furnace body, and the heating body is connected to an inlet and an outlet of the furnace body via a circulation pipeline. 10
3. The hot-air oxygen-free brazing system according to claim 1, wherein the hot-air circulation system is of an internal circulation structure, a heating zone is disposed inside the furnace body, the heating zone is communicated with the working chamber, and a power device leads gas passing through the heating zone into the working chamber to form a hot-air circulation channel. 15
4. The hot-air oxygen-free brazing system according to claim 3, wherein the heating zone and the working chamber are disposed in a same cavity, and partitioned by a partition plate; or the heating zone and the working chamber are independent cavities, respectively.
5. The hot-air oxygen-free brazing system according to any one of claims 1 to 4, wherein the hot-air circulation system leads gas into an inner chamber of the workpiece and 20 heats the workpiece.
6. The hot-air oxygen-free brazing system according to any one of claims 2 to 4, wherein the power device is a fan, the fan being disposed inside or outside the furnace body, or the fan being partially disposed inside the furnace body and partially disposed outside the furnace body. 25
7. The hot-air oxygen-free brazing system according to claim 6, wherein when the structure of the fan is disposed inside the furnace body partially or entirely, the fan is a high-temperature fan, the high-temperature fan comprises a shaft and a main cooling body, and a part, extending into the working chamber, of the shaft is wrapped by the main cooling body.
8. The hot-air oxygen-free brazing system according to claim 7, wherein the high-temperature fan resists a temperature of 450 ℃ or above. 5
9. The hot-air oxygen-free brazing system according to claim 7, wherein the high-temperature fan resists a temperature of 600 ℃ or above.
10. The hot-air oxygen-free brazing system according to claim 7, wherein the main cooling body is a hollow housing made of a high-temperature-resistant material, and the part, extending into the working chamber, of the shaft penetrates through an inner chamber 10 of the housing; or the main cooling body is a shaft seat, a shaft body inner chamber of the shaft seat is hollow, a water cooling jacket is disposed in the inner chamber of the shaft seat to form a water cooling shaft seat, and the part, extending into the working chamber, of the shaft penetrates through the inner chamber of the shaft seat.
11. The hot-air oxygen-free brazing system according to any one of claims 1 to 4, 15 wherein rollers are disposed in the working chamber, each roller is installed on a roller holder, and a bottom plate is placed on the rollers.
12. The hot-air oxygen-free brazing system according to any one of claims 1 to 4, wherein a rapid cooling fan is disposed outside a furnace cover of the furnace body, the rapid cooling fan being communicated with the working chamber. 20
13. The hot-air oxygen-free brazing system according to any one of claims 1 to 4, wherein a heat exchanger is disposed outside a furnace cover of the furnace body, the inner side of the furnace cover is communicated with the heat exchanger via a pipeline, and a cooling medium is fed into the pipeline.
14. The hot-air oxygen-free brazing system according to any one of claims 1 to 4, 25 wherein an upper part and/or lower part of a furnace cover of the furnace body are/is provided with a thermal insulation door(s).
15. The hot-air oxygen-free brazing system according to claim 14, wherein the thermal insulation door is opened electrically or adaptively.
16. The hot-air oxygen-free brazing system according to claim 15, wherein the adaptive structure is: the thermal insulation door is disposed at a cooling blowing side or a cooling suction side, and is opened by cooling blowing or suction. 5
17. The hot-air oxygen-free brazing system according to any one of claims 1 to 4, wherein the furnace body comprises a liner, the liner adopting an integral liner or a multi-section liner; and a thermal insulation layer is disposed on the liner.
18. The hot-air oxygen-free brazing system according to claim 4, wherein the partition plate adopts a multi-cavity grid structure; or the partition plate is of a solid or hollow 10 structure.
19. The hot-air oxygen-free brazing system according to claim 11, wherein the rollers and/or roller holders and/or bottom plate are made of at least one of graphite, carbon-carbon, silicon carbide, corundum, molybdenum, and tungsten.
20. The hot-air oxygen-free brazing system according to claim 7, wherein the 15 high-temperature fan is made of at least one of graphite, carbon-carbon, silicon carbide, and heat-resistant steel.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201611072348.7 | 2016-11-29 | ||
CN201710379554.0 | 2017-05-25 | ||
CN201710742327 | 2017-08-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ741346A true NZ741346A (en) |
Family
ID=
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