CN106944704A - A kind of inert gas heater for wave soldering device - Google Patents
A kind of inert gas heater for wave soldering device Download PDFInfo
- Publication number
- CN106944704A CN106944704A CN201611234429.2A CN201611234429A CN106944704A CN 106944704 A CN106944704 A CN 106944704A CN 201611234429 A CN201611234429 A CN 201611234429A CN 106944704 A CN106944704 A CN 106944704A
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- CN
- China
- Prior art keywords
- inert gas
- temperature
- heater according
- spirality
- heat carrier
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/08—Soldering by means of dipping in molten solder
- B23K1/085—Wave soldering
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Furnace Details (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
The inert gas of wave soldering simply can accurately be heated to required temperature by a kind of inert gas heater for wave soldering device, heating and gas temperature control problem available for the inert gas for solving wave soldering, device.Gas temperature at the inert gas heating means exit reaches as high as 600 DEG C, and the adjustable scope of temperature is larger, from 100 DEG C to 600 DEG C, and the gas temperature measured in heater gas vent is fluctuated in positive and negative 2 DEG C of setting heating-up temperature.
Description
Technical field
The present invention relates to a kind of inert gas heater for wave soldering device.
Background technology
Wave soldering is a kind of important Electronic Assembly Foundation, by the solder under molten condition, in solder bath liquid level
The solder wave of given shape is formed, the printed circuit board (PCB) for having inserted electronic component passes through solder wave through certain angle and depth
Peak so that the pin that electronic component is exposed by through hole immerses solder wave, and solder is realized because capillary effect climbs into through hole
The welding of electronic component.
During wave soldering, the workpiece of processing to be welded, such as printed circuit board (PCB) are at least one produced by solder bath
Pass through on individual solder wave, as the ripple in wave soldering processes is stirred, the oxidation of solder can aggravate, and the oxidation of solder is not only produced
A large amount of molten slages, and more weld defects can be produced and the reliability of solder joint is reduced.Typically set above solder bath lazy
Property atmosphere, be covered in solder surface, completely cut off air, so as to reduce or prevent the oxidation of solder.United States Patent (USP) US5044542
（1989）A kind of gas shield wave-soldering is described, wave-soldering is carried out in the environment of inert gas, inert gas can be with
It is simple inert gas or is mixed with the inert gas of a small amount of reducing gas for removing oxygen.But during welding equipment works
Solder sputter and scaling powder volatilization always occurs, they can stick on nanoporous pipe and cause inert gas gas outlet to block up
Plug.
Because the temperature in gas shield wave soldering region is typically 250-270 DEG C, and need substantial amounts of inert gas
Completely cut off air；If inert gas can influence the temperature stability of welding region without preheating, and then cause welding effect not
It is good.United States Patent (USP) US4606493（1984）Disclose a kind of method and dress that printed circuit board (PCB) is welded in atmosphere of inert gases
Put, if touching the inert gas that the high speed splashed is sprayed into provided with carried interest and printed circuit board (PCB) bottom surface by gap, inert gas jet flow
Temperature is set to 2 times of fusion welding temperature in solder bath（More than 600 DEG C）, due to produced heat when can prevent from welding
And make terminal（Typically copper）Aoxidize and reduce the defect that thermal stress occurs in circuit board.United States Patent (USP) US5520320
（1994）A kind of wave soldering processes for having inert gas atmosphere to inject wave-soldering unit are disclosed, pass through control input gas
Temperature improves from ambiance to the thermal efficiency of printed circuit board (PCB) heat transfer to improve the quality of pad.Wave-soldering unit enters
Atmosphere around the especially printed circuit board (PCB) of the region of solder bath should keep laminar condition and its temperature should be controlled at 20 DEG C to 250
℃（Preferably 80 DEG C to 200 DEG C）Between to improve the quality of pad.United States Patent (USP) US5769305（1996）Disclose one kind
Wave soldering apparatus, wherein inert gas is fed into wave soldering region via the inert gas supply pipeline through solder bath.
Inert gas supply pipeline is arranged to from above through cover lid and comes gas distribution member through solder bath.Inert gas is supplied
Pipeline is connected to the gas distribution member particularly below cover lid.However, the inert gas supply pipe being immersed in solder bath
The curtailment of line with inert gas by be immersed in solder with inert gas supply pipeline when significantly raise indifferent gas
The temperature of body.Chinese invention patent Authorization Notice No. CN201020583Y（2007）Disclose a kind of nitrogen-protective soldering furnace intermittently
Stove preheating purification device, will be placed in the wall of preheating purification device for the nitrogen pipeline to brazing area supplying nitrogen,
Between zone of heating and heat-insulation layer, the gap of nitrogen-protective soldering furnace door and preheating purification device cavity is utilized so that overflow brazing area
The nitrogen gone out enters preheating purifying area.The B2 of United States Patent (USP) US 8,403,200（2010）Disclose a kind of for supplied for inert gas
Body is to protect the surface of the solder bath in wave soldering device to exempt from the method for oxidation, and wherein inert gas is from above through cover
Lid is supplied to the heat exchanger in the solder bath being immersed in below cover lid, is heated by heat exchanger, and be supplied back through cover lid
Top and reach wave soldering device.Prevent at a temperature of inert gas is practically at solder bath and thus solder in crest
Solidification and part to be welded are cooled down between two crests on distributor in welding equipment.The solder of splashing is prevented to exist
Solidify on the component of inert gas distribution system.Carry out heat exchange to heat using the solder in solder bath and inert gas piping
Inert gas, can make the temperature of solder reduces, particularly when solder bath volume is little, and solder cooling may be more than 15
DEG C, it can so have a strong impact on the effect of follow-up wave soldering.In addition, being influenceed by solder bath temperature, inert gas after heat exchange
Temperature be difficult more than 220 DEG C.In addition the heat exchanging pipe of inert gas is immersed in solder and can be corroded throughout the year, once heat is handed over
Change pipe damaged, inert gas leakage will cause solder sputter.
The content of the invention
It is an object of the invention to the heating problems for the inert gas that solves wave soldering, especially it is to provide one
Inert gas heater is planted, the protection gas of wave soldering simply can accurately be heated to required temperature by the device
Degree.
The technical solution adopted by the present invention is to use a kind of inert gas heater for wave soldering device, comprising
Shell, insulation material, heat carrier, spirality inert gas piping, heating element heater, wherein temperature control system, heating element heater bag
Containing heating rod and heating wire, the air inlet of spirality inert gas piping and gas outlet are located on shell respectively, air inlet and go out
Gas port is connected by pipeline with outside gas circuit, spirality inert gas piping outer wrapping heat carrier, is thermal insulating material outside heat carrier
It is shell outside material, insulation material, temperature control system is connected with heating element heater, temperature control system includes two temperature sensings
Device and heating control apparatus, heating control apparatus are connected with hygrosensor and heating element heater, control the switch of heating element heater.
Preferably, the heating rod is located at the axis line position of spirality inert gas piping wound interior, the electric heating
Silk is wrapped in outside heat carrier.
Preferably, the groove of external screw thread shape, groove of the heating wire winding outside heat carrier are provided with outside the heat carrier
Interior, groove spacing is 5-100mm.
Preferably, the pitch of the spirality inert gas piping is the 0.01-10 of spirality inert gas piping caliber
Times.
Preferably, the insulation material selected from titanium silicate, silica, aluminum oxide, titanium oxide in composite porous one
Plant or several compounds.
Preferably, the insulation material is titanium silicate（Ti2Si2O5）.
Preferably, the aperture of the titanium silicate insulation material is less than 70nm.
Preferably, inert gas gas outlet pipeline connects entering for the inert gas protection device of wave soldering device
Mouthful, inert gas air inlet connection noble gas source.
Preferably, the hygrosensor be arranged on the pipeline of inert gas gas outlet and heat carrier in.
Preferably, the hygrosensor can be that thermocouple, thermal resistance or liquid rise the temperature probe of formula temperature switch.
Preferably, the heat carrier can also be Cu, Al and the good material of other heat conductivilitys, and the material includes copper
Alloy or other alloys.
Preferably, the heat carrier is cast on together with spirality inert gas piping.
Preferably, the inert gas is nitrogen or the protection gas of other wave solderings.
The present invention has advantages below compared with prior art：
1st, simple installation of the present invention, can protect direct improvement and installation, the wave-soldering of all size on wave-soldering furnace in existing nitrogen
Stove can be applicable.
2nd, the present invention is easy to operate, and heated perimeter is larger, and the inert gas temperature at heating means exit reaches as high as 600
DEG C, and the adjustable scope of temperature is larger, from 100 DEG C to 600 DEG C.And the gas measured in the inert gas gas outlet of heater
Temperature is fluctuated in positive and negative 2 DEG C of setting heating-up temperature.
3rd, the present invention can conveniently and accurately adjust the inert gas temperature at heating means exit, preferably to adjust
This parameter of inert gas temperature during wave-soldering.
4th, the present invention is not required to inert gas piping being immersed in solder bath, and maintenance is convenient.
Brief description of the drawings
Fig. 1 is the front section view of inert gas heater.
Fig. 2 is the winding schematic diagram of the outer heating wire of heat carrier in Fig. 1.
Wherein：1- shells；2- insulation materials；3- heat carriers；4- spirality inert gas pipings；5- heating rods；6- electric heating
Silk；7- inert gas piping air inlets；8- inert gas pipings gas outlet；9- hygrosensors；10- hygrosensors；11- is recessed
Groove.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
As shown in figure 1, a kind of inert gas heater for wave-soldering of the present invention, includes shell 1, insulation
Material 2, heat carrier 3, spirality inert gas piping 4, heating rod 5 and heating wire 6, temperature control system.Wherein spirality is lazy
Property gas piping air inlet 7 and gas outlet 8 respectively be located at shell on, air inlet by soon insert be connected with Nitrogen source gases, outlet
Mouth is connected by cutting ferrule with wave-soldering nitrogen charging equipment.The caliber of spirality inert gas piping is 8mm, and pitch is about 0.1 times of pipe
Footpath, the diameter of spirality inert gas piping wound interior is about 3cm.The power of heating rod 5 is 5000w, and length is about 30cm, position
In the axis line position of helix tube wound interior, the diameter of heating rod and the diameter base of spirality inert gas piping wound interior
This is consistent.Spirality inert gas piping outer wrapping cast copper heat carrier 3, spirality inert gas piping is cast with cast copper heat carrier
Together.The power of heating wire 6 is 2000w, is wrapped in the pre-processed external screw thread shape groove outside heat carrier, between groove
Away from for 30mm.The outside of heat carrier 3 is insulation material 2, because heating wire 6 is fixed in the groove 11 outside heat carrier 3（Such as Fig. 2
It is shown）, it is possible to reduce heating wire moves and cast copper heat conduction external surface is preferably fitted with insulation material, while can be with
Increase the heat exchange area of heat carrier and heating wire.It is shell 1 outside insulation material 2, insulation material is titanium silicate Ti2Si2O5It is micro-
Hole heat-barrier material, aperture in 40nm or so, with normal temperature than still air also low thermal conductivity factor, even if heat conduction temperature is super
600 DEG C are crossed, shell is still unlikely to overheat.Temperature control system includes two hygrosensors 9,10, and heating control apparatus, two
Hygrosensor measures the temperature of heat carrier and the temperature of gas at inert gas piping gas outlet, heating control apparatus respectively
For control relay, it is connected with hygrosensor and be connected with heating rod 5 and heating wire 6, controls the switch of heating element heater.Temperature control
System processed can set heating-up temperature, by heating element heats heat carrier, and spirality nitrogen pipeline is wound positioned at helix tube
Cast copper heat carrier outside internal heating rod and its winding is fully heated, the spirality inert gas of inert gas heater
Nitrogen temperature at pipeline gas outlet is monitored by hygrosensor, and the temperature of cast copper heat carrier is also monitored, and can be gone out according to nitrogen
The nitrogen temperature of gas port, switch control is carried out by heating control apparatus to heating element heater.
A kind of occupation mode of the present invention during wave soldering：
First by the gas in nitrogen displacement heater gas circuit, operation is started after closing source of the gas.
Temperature control system sets heating-up temperature as 400 DEG C, opens heating control apparatus, opens heating element heater, is passed through nitrogen
The temperature of gas, wherein nitrogen is that nitrogen pressure is 4atm at room temperature, source outlet, and the flow velocity of nitrogen in normal conditions is
6Nm3/h.The nitrogen temperature detector on the pipeline of nitrogen gas outlet is read after about 10min, 398 DEG C -402 DEG C are shown as.Simultaneously
The temperature in the nitrogen atmosphere in solder for wave crest welding groove nitrogen protection device is measured, maximum temperature takes up to 280 DEG C -350 DEG C
Certainly in the nitrogen pipeline length of heater to Wave-soldering device, and whether it is surrounded by the factors such as insulation material.The temperature and weldering
220 DEG C of the maximum temperature of the hot inert gas of hopper heat exchange production is compared to much higher.
Temperature control system sets heating-up temperature as 600 DEG C, opens heating control apparatus, opens heating element heater, about 15-
The nitrogen temperature detector on the pipeline of nitrogen gas outlet is read after 20min, 598 DEG C -602 DEG C are shown as.Nitrogen is measured simultaneously
Temperature in inert gas atmosphere, maximum temperature is up to 330 DEG C -500 DEG C.Inert gas heating dress in the present invention for wave-soldering
Putting accurately can adjust and control the temperature of inert gas, to find and confirm for the optimal indifferent gas body temperature of wave-soldering
Spend parameter.Compared with nitrogen inert gas mode of heating traditional and that solder bath heat exchange is produced, the present invention need not be by nitrogen
Pipeline incident wave weld groove, can prevent the corrosion of nitrogen pipeline, and the influence to solder temperature.
If heat carrier is Al materials, about 400 DEG C of maximum heating temperature uses other heat carriers, maximum heating temperature root
It is different according to heat carrier composition difference.The nitrogen that wave soldering needs protects temperature degree about at 300 DEG C or so, than the temperature of solder bath
Degree is slightly higher, and the gas temperature to be heated can be protected to select suitable heat carrier according to nitrogen.
The nitrogen flow rate general control of spirality inert gas piping is flowed through in 4-8Nm3In/h, inert gas heater
Spiral air pipeline total length can be calculated by heat transfer basic equation, Q=KA △ tm, major parameter Q is thermic load, and K is heat transfer
Coefficient (entire thermal resistance is reciprocal), A is heat exchange area, △ tmFor logarithmic mean temperature difference (LMTD) (logarithmic mean motive force), pipeline total length takes
Certainly in gaseous species and flow velocity, tubing internal diameter, pipe thickness, heat carrier material, the parameter such as heating-up temperature.
It should be understood that, although the present specification is described in terms of embodiments, but not each embodiment only includes one
Individual independent technical scheme, this narrating mode of specification is just for the sake of for the sake of clear, and those skilled in the art should be by
Specification is as an entirety, and technical scheme in embodiment can also be through appropriately combined, and forming those skilled in the art can
The other embodiment of understanding.Above is of the invention obtain preferred embodiment, but the invention is not limited to the embodiment, this
A variety of equivalent modifications or replacement that the technical staff in field is substantially made according to the technology of the present invention, being all contained in the application right will
Ask in limited range, such as spirality inert gas piping can be round screw thread or square spiral or other
The spiral of shape, the shape of heat carrier can be cylinder, cuboid or other shapes.
Claims (13)
1. a kind of inert gas heater for wave soldering device, it is characterised in that comprising shell, insulation material is led
Hot body, spirality inert gas piping, heating element heater, wherein temperature control system, heating element heater include heating rod and heating wire,
The air inlet of spirality inert gas piping and gas outlet are located on shell respectively, and air inlet and gas outlet pass through pipeline and outside
Gas circuit is connected, spirality inert gas piping outer wrapping heat carrier, is outside being outside heat carrier outside insulation material, insulation material
Shell, temperature control system is connected with heating element heater, and temperature control system includes two hygrosensors and heating control apparatus, plus
Heat control device is connected with hygrosensor and heating element heater, controls the switch of heating element heater.
2. inert gas heater according to claim 1, it is characterised in that the heating rod is located at spirality inertia
The axis line position of gas piping wound interior, the heating wire winding is outside heat carrier.
3. inert gas heater according to claim 2, it is characterised in that external screw thread is provided with outside the heat carrier
The groove of shape, heating wire winding is in the groove outside heat carrier, and groove spacing is 5-100mm.
4. inert gas heater according to claim 1 or 2, it is characterised in that the spirality inert gas tube
The pitch on road is 0.01-10 times of spirality inert gas piping caliber.
5. inert gas heater according to claim 1 or 2, it is characterised in that the insulation material is selected from silicic acid
One or more of compounds during titanium, silica, aluminum oxide, titanium oxide are composite porous.
6. inert gas heater according to claim 5, it is characterised in that the insulation material is titanium silicate.
7. inert gas heater according to claim 6, it is characterised in that the aperture of the titanium silicate insulation material
Less than 70nm.
8. inert gas heater according to claim 1 or 2, it is characterised in that the inert gas outlet tube
The import of the inert gas protection device of road connection wave soldering device, inert gas air inlet connection noble gas source.
9. inert gas heater according to claim 1 or 2, it is characterised in that the hygrosensor is arranged on
On the pipeline of inert gas gas outlet and in heat carrier.
10. inert gas heater according to claim 9, it is characterised in that the hygrosensor can be heat
Galvanic couple, thermal resistance or liquid rise the temperature probe of formula temperature switch.
11. inert gas heater according to claim 1 or 2, it is characterised in that the heat carrier can also be
Cu, Al and the good material of other heat conductivilitys, the material include copper alloy or other alloys.
12. inert gas heater according to claim 11, it is characterised in that the heat carrier and spirality inertia
Gas piping is cast on together.
13. inert gas heater according to claim 1 or 2, it is characterised in that the inert gas be nitrogen or
The protection gas of other wave solderings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611234429.2A CN106944704B (en) | 2016-12-28 | 2016-12-28 | A kind of inert gas heating device for wave soldering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611234429.2A CN106944704B (en) | 2016-12-28 | 2016-12-28 | A kind of inert gas heating device for wave soldering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106944704A true CN106944704A (en) | 2017-07-14 |
| CN106944704B CN106944704B (en) | 2019-10-25 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611234429.2A Active CN106944704B (en) | 2016-12-28 | 2016-12-28 | A kind of inert gas heating device for wave soldering device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556199A (en) * | 2020-06-25 | 2021-03-26 | 明宝能源株式会社 | Control system for electrode type boiler |
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| FR2505461A1 (en) * | 1981-05-05 | 1982-11-12 | Guilhaumon Aime | Heat recuperator for hot water boiler - has water coil around exhaust gas duct with insulation packing |
| CN101655472A (en) * | 2009-10-09 | 2010-02-24 | 丁五行 | Constant temperature insulation system for thermal conductivity gas detection |
| JP2011214537A (en) * | 2010-04-01 | 2011-10-27 | Sakamoto Industry Co Ltd | Exhaust gas heat recovery device |
| CN203140915U (en) * | 2013-02-04 | 2013-08-21 | 日东电子科技(深圳)有限公司 | Nitrogen protection device |
| KR101420348B1 (en) * | 2013-03-18 | 2014-07-16 | 우성이엔디주식회사 | Nitrogen gas injection apparatus using heat of dry pump |
| CN203849084U (en) * | 2014-04-15 | 2014-09-24 | 南京国电环保科技有限公司 | Gas-heating constant temperature preheater |
| CN206677349U (en) * | 2016-12-28 | 2017-11-28 | 乔治洛德方法研究和开发液化空气有限公司 | A kind of inert gas heater for wave soldering device |
-
2016
- 2016-12-28 CN CN201611234429.2A patent/CN106944704B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2505461A1 (en) * | 1981-05-05 | 1982-11-12 | Guilhaumon Aime | Heat recuperator for hot water boiler - has water coil around exhaust gas duct with insulation packing |
| CN101655472A (en) * | 2009-10-09 | 2010-02-24 | 丁五行 | Constant temperature insulation system for thermal conductivity gas detection |
| JP2011214537A (en) * | 2010-04-01 | 2011-10-27 | Sakamoto Industry Co Ltd | Exhaust gas heat recovery device |
| CN203140915U (en) * | 2013-02-04 | 2013-08-21 | 日东电子科技(深圳)有限公司 | Nitrogen protection device |
| KR101420348B1 (en) * | 2013-03-18 | 2014-07-16 | 우성이엔디주식회사 | Nitrogen gas injection apparatus using heat of dry pump |
| CN203849084U (en) * | 2014-04-15 | 2014-09-24 | 南京国电环保科技有限公司 | Gas-heating constant temperature preheater |
| CN206677349U (en) * | 2016-12-28 | 2017-11-28 | 乔治洛德方法研究和开发液化空气有限公司 | A kind of inert gas heater for wave soldering device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556199A (en) * | 2020-06-25 | 2021-03-26 | 明宝能源株式会社 | Control system for electrode type boiler |
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