CN103817925A - Fluoroplastic condenser welding equipment and welding process thereof - Google Patents
Fluoroplastic condenser welding equipment and welding process thereof Download PDFInfo
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- CN103817925A CN103817925A CN201410058531.6A CN201410058531A CN103817925A CN 103817925 A CN103817925 A CN 103817925A CN 201410058531 A CN201410058531 A CN 201410058531A CN 103817925 A CN103817925 A CN 103817925A
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Abstract
The invention provides fluoroplastic condenser welding equipment, comprising an outer shell, an infrared heater disposed at the inner side of the outer shell, a fan disposed at the upper part of the outer shell, a fixing mold disposed at the lower end of the outer shell, a tube plate disposed below the outer shell through the fixing mold, a tube bundle connected to the tube plate through the fixing mold and a temperature sensor connected to the fixing mold. The tube bundle is provided with a modified PTFE inner core. Besides, the invention also provides a process for welding by using the equipment. The fluoroplastic condenser welding equipment prepared by the welding process provided by the invention is expected to achieve the following technical indexes: (1) a welding depth is larger than 8 mm; a welding surface is flat; and the fluoroplastic condenser welding equipment has no bubble; (2) pressure tests after shaping show that the fluoroplastic condenser welding equipment has no bubble after being kept for 30 minutes at a temperature of 25 DEG C and gas tightness of 0.45 MPa; and hydrostatic test show that the fluoroplastic condenser welding equipment has no leakage after being kept for 30 minutes at a pressure of 0.6 MPa.
Description
Technical field
The present invention relates to a kind of industrial equipment and application thereof, be specifically related to a kind of fluoroplastics condenser welding equipment and welding procedure thereof.
Background technology
Trichloroacetic acid, hydrogen fluoride all belong to poisonous class chemical products, if accidentally suck dust, respiratory tract are had to spread effect, can cause that cough, pectoralgia and central nervous system suppress; Eye directly contact can cause serious harm, and severe one can cause blind; Skin contact can cause chemical burn.Therefore strictly avoid in process of production links to produce and reveal, especially in cooling link.Therefore the performance technologies of condenser is had higher requirement.
Condenser belongs to heat exchanger, and first teflon heat exchanger is manufactured success and realized commercialization production in nineteen sixty-five by DuPont company of the U.S..China has also dropped into substantial contribution and manpower and has been devoted to the development of teflon heat exchanger, and domestic various types of teflon heat exchangers drop into successively production application and obtain good effect.Sun Yuhong has introduced the corrosion-resistant and high-low temperature resistant characteristic of polytetrafluoroethylene (PTFE) brilliance for 2008 all-sidely, makes it to become the resistant material of extensive use, but polytetrafluoroethylene (PTFE) itself still exists the defect such as difficult melt-processed, difficult welding.Xia Qiao adopts plastic heat exchanger to replace metallic recuperator to solve the etching problem of lithium bromide refrigerator for bright 2011, and the heat transfer coefficient of this heat exchanger is 229W/ (m2K), and the theoretical COP of economic benefits and social benefits plastics Australia clang refrigeration unit can reach 1.27.The plastic heat exchanger that QiYuan roc proposes to adopt thin-walled pipe with small pipe diameter polytetrafluoroethylplastic plastic pipe to make for 2010 replaces the metallic recuperator in traditional sewage source heat pump system; Experimental result shows that it is better than traditional metallic recuperator at aspects such as volume, installation and maintenance expense, job stabilitys, has not only expanded the mentality of designing of native sewage water heat pump heat exchanger, has expanded the application of plastic heat exchanger.But it is simple that current fluoroplastics tube sheet and pipe are connected technique, the advantage such as processing ease and technological process are short, but labor productivity is low, and technological operation is difficult to mechanization, tube sheet material consumption is many, makes teflon heat exchanger price high, affects it and applies.In addition, traditional welding procedure, welding equipment can not well be controlled the uniformity of temperature, therefore the depth of weld is inadequate, under long-term use, easily cause leakage, and adopt the swollen technique of metal-cored limit, be subject to the metal-cored meeting of effect of gravity to tilt sagging, perfluoroalkoxy resin (being called for short PFA) tube sheet is restrained in the time of molten condition, because metal-cored proportion is greater than 3.5 times, fluoroplastics, cause face of weld imbalance, and affect the quality of weld appearance and welding, in use often occurring expands with heat and contract with cold causes the distortion of plastic tube, cause in use easily occurring leakage phenomenon, and PFA material meeting corroding metal core in higher temperature situation, there is bonding to need irregularly to change in core, increase manufacturing cost.
Summary of the invention
For addressing the above problem, inventor's autonomous Design the infrared heating welding equipment that welds of a kind of PFA tube bank and the tube sheet degree of depth, and this equipment of a kind of application technique of carrying out the welding of fluoroplastics condenser.
A kind of fluoroplastics condenser welding equipment, comprise shell, also comprise infrared heater inside the shell of setting, be arranged on shell upper fan, be arranged on the fixed mould of shell lower end, be arranged on tube sheet, the tube bank being connected with tube sheet by fixed mould of shell below and be connected to the temperature sensor on fixed mould by fixed mould, tube bank is provided with modified ptfe inner core.Adopt the infrared heating technology of high-efficiency environment friendly, heat up rapidly, heat transmits by forms of radiation, thermal inertia is little, and heating properties is good, and top is provided with fan, after stirring, make whole welding surroundings temperature even, adopt high sensitivity temperature sensor control, guarantee that tube sheet and tube bank are heated evenly, and can carry out degree of depth melting; Through development test repeatedly, adopt modified ptfe inner core, can solve the defect of fluoroplastics limit expanded and welded tube joint in connecing, make more than the depth of weld reaches 8mm bright and clean, the smooth zero defect of soldering opening.
As preferably, tube sheet is PFA tube sheet.Adopt PFA tube bank to carry out condensation to corrosive liquids such as acidity, chemical property stabilizer pole, the etch resistant properties of PFA are good, and welding procedure is simple compared with other fluoroplastics simultaneously, firm and durable more after welding.
As preferably, restrain the tube bank into PFA.
As preferably, shell inner side is provided with heat-insulation layer, and infrared heater is positioned at heat-insulation layer the inner.
In addition, also provide a kind of application technique that this equipment welds: step 1) PFA and auxiliary material are heated, compression moulding, pressurize moulding, the then demoulding, 2 heat treatment shapings, Vehicle Processing, numerical control are deployed to ensure effective monitoring and control of illegal activities, cleaning is processed, check and obtain qualified PFA tube sheet; Step 2) PFA and auxiliary material are through extruding and shaping, and obtain moulding tube bank through 2 pipe heat treatment, 2 pipe sizings; Step 3) moulding tube bank and PFA tube sheet location, dedusting, sleeve pipe, tack, installs welding external mold, inserts nonmetal inner core, 2 clean processing; Step 4) installation infrared line heater is also used its fusion weld, and cooling rear check, pulls out inner core, removes welding equipment; Step 5) pressure check is qualified completes welding job.
Wherein, nonmetal inner core is the nonmetal inner core of polytetrafluoroethylene (PTFE), its its swelling employing Single cell fusion welding procedure.In welding procedure, a key technical index is as follows:
PFA raw material melt index 1～2.6; Density>=2.13～2.16 after tube sheet and tube bank moulding, surface color is even, maximum contaminant < 1mm, quantity Area Ratio < 5/m
2; Tube bank circularity and diameter error < 0.05mm; Tube sheet punching interval error is less than 0.2mm, aperture error ± 0.05mm; 10 ℃ of the melt temperatures of this material of melt temperature > PFA of non-technology core; Welding temperature is the highest is no more than 365 ℃; Depth of weld > 8mm; Welding rear surface is smooth; Pore-free; Percentage of plugged hole is less than 2 ‰.
Infrared heating welding equipment provided by the invention adopts the infrared heating technology of high-efficiency environment friendly, heat up rapidly, heat transmits by forms of radiation, thermal inertia is little, and heating properties is good, and top is provided with fan, after stirring, make whole welding surroundings temperature even, adopt the control of WZP-PT100 high sensitivity temperature sensor, guarantee that tube sheet and tube bank are heated evenly, and can carry out degree of depth melting; Through development test repeatedly, adopt the nonmetal inner core of polytetrafluoroethylene (PTFE), successfully solve the defect of PFA material limit expanded and welded tube joint in connecing, make more than the depth of weld reaches 8mm bright and clean, the smooth zero defect of soldering opening.
Welding procedure provided by the invention is heat-treated technique to PFA pipe before welding, and expanding with heat and contract with cold of stopping in use to occur causes the distortion of plastic tube; In welding process strict control temperature between 323-326 ℃, the time is between 1-2h, adopt " fusion process that the nonmetal molten core of PFA is swollen " and " PFA tube sheet is limit the swollen infrared heating welding of exerting pressure " technology, solved the key technology that fluoroplastics pipe is connected with tube sheet.Before tube bank and Tube-sheet Welding, PFA tube bank is shaped, special annealing heat treatment (320 ℃ insulation 1 hour) etc., that reduces that it in use occurs expands with heat and contract with cold and causes the possibility of plastic pipe deformation, has improved the mechanical property that tube bank is used; Be more conducive to the suit of tube bank and tube sheet simultaneously.In addition, adopt the tube bank of PFA material to carry out condensation to corrosive liquids such as acidity, the chemical property stabilizer pole of PFA, etch resistant properties is good; Fluorine plastic tube wall surface is smooth, and has the flexible of appropriateness, and micro-when use have vibration, therefore less scaling; Teflon heat exchanger volume is little, compact conformation, more than 4 times of shell-and-tube heat exchanger that in FU volume, heat transfer area is metal tube; Simultaneously welding procedure is simple compared with other fluoroplastics, firm and durable more after welding.
Adopt fluoroplastics condenser prepared by welding procedure provided by the invention to estimate to reach following technical indicator:
(1) depth of weld > 8mm; Face of weld is smooth; Pore-free.
(2) pressure test after moulding: 25 ℃ of test temperatures, air-tightness 0.45Mpa, pressurize 30 minutes is without bubbling; 30 minutes nothings of water pressure test 0.6Mpa pressurize are leaked.
Accompanying drawing explanation
Fig. 1 is the profile of infrared heating welding equipment.
Fig. 2 is welding process flow figure.
The toponym that in accompanying drawing, each number designation refers to is as follows: wherein 1-shell, 2-infrared heater, 3-fan, 4-fixed mould, 5-tube sheet, 6-tube bank, 7-temperature sensor, 8-modified ptfe inner core, 9-heat-insulation layer.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Embodiment 1
A kind of fluoroplastics condenser welding equipment, as shown in Figure 1, comprise shell 1, also comprise be arranged on shell 1 inner side infrared heater 2, be arranged on shell 1 top fan 3, be arranged on the fixed mould 4 of shell 1 lower end, by fixed mould 4 be arranged on the tube sheet 5 of shell 1 below, the tube bank 6 that is connected with tube sheet 5 by fixed mould 4 and be connected to the temperature sensor 7 on fixed mould 4, tube bank 6 is provided with modified ptfe inner core 8.Tube sheet 5 is fixedly installed on fixed mould 4.
In the present embodiment, tube sheet 5 is PFA tube sheet, and tube bank 6 is PFA tube bank.
Shell 1 inner side is provided with heat-insulation layer 9, and infrared heater 2 is positioned at heat-insulation layer 9 the inners.
The flabellum of fan 3 extends to shell 1 middle part.
Employing has the PFA material of strong corrosion resistant performance and restrains 6 convey materials, has solved the defect that metal cold condenser can not use under special high corrosion operating mode.Constantly perfect by structure, PFA welding technique, has solved fluoroplastics and has restrained the key technology being connected with tube sheet 5.And the depth of weld has reached 8mm, under long-term use, the familiar lacunas such as can guarantee that ftracture, expand, break does not appear in tube sheet 5 and tube bank 6 welds, has guaranteed the security that hazardous gas is produced, and the while has also extended the service life of equipment greatly.
Due to the chemical property stabilizer pole of fluoroplastics, etch resistant properties is especially good.Fluorine plastic tube wall surface is smooth, and has the flexible of appropriateness, and micro-when use have vibration, therefore less scaling.Fluoroplastics condensation vessel volume is little, compact conformation, more than 4 times of shell-and-tube heat exchanger that in FU volume, heat transfer area is metal tube.Flexible fluorine plastic tube can be in the shock and vibration of fluid trouble free service, tube bank 6 can be made various special shapes on demand.Be widely used in the industries such as chemical industry, pickling, plating medicine, anodic oxidation, meanwhile, because its heat resistance is splendid, be both applicable to Steam Heating, be also applicable to hot water heating.The present invention adopts 6 pairs of acid corrosive liquids that wait of tube bank of PFA material to carry out condensation, and progressively alternative metals heat exchanger, reaches energy-saving and emission-reduction, reduces Enterprise Integrated cost.
This infrared heating welding equipment can be used for the welding of nonmetallic core and PFA tube bank in the condenser of fluoroplastics.
Embodiment 2
A kind of technique of utilizing infrared heating welding equipment to carry out condenser welding, as shown in Figure 2, its step comprises: 1) PFA and auxiliary material heat, compression moulding, pressurize moulding, the then demoulding, 2 heat treatment shapings, Vehicle Processing, numerical control are deployed to ensure effective monitoring and control of illegal activities, cleaning is processed, check and obtain qualified PFA tube sheet; 2) PFA and auxiliary material, through extruding and shaping, obtain moulding tube bank through 2 pipe heat treatment, 2 pipe sizings; 3) moulding tube bank and PFA tube sheet location, dedusting, sleeve pipe, tack, installs welding external mold, inserts the nonmetal inner core of polytetrafluoroethylene (PTFE), 2 clean processing; 4) installation infrared line heater is also used its fusion weld, and cooling rear check, pulls out inner core, removes welding equipment; 5) pressure check is qualified completes welding job.Wherein, PFA raw material melt index 1～2.6; Density>=2.13～2.16 after tube sheet and tube bank moulding, surface color is even, maximum contaminant < 1mm, quantity Area Ratio < 5/m
2; Tube bank circularity and diameter error < 0.05mm; Tube sheet punching interval error is less than 0.2mm, aperture error ± 0.05mm; 10 ℃ of the melt temperatures of this material of melt temperature > PFA of non-technology core; Welding temperature is the highest is no more than 365 ℃, and be 1-2h weld interval; Depth of weld > 8mm; Welding rear surface is smooth; Pore-free; Percentage of plugged hole is less than 2%.Wherein, the preferred 323-326 ℃ of welding temperature.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (8)
1. a fluoroplastics condenser welding equipment, it is characterized in that, comprise shell (1), it is characterized in that: also comprise be arranged on shell (1) inner side infrared heater (2), be arranged on shell (1) top fan (3), be arranged on the fixed mould (4) of shell (1) lower end, be arranged on tube sheet (5), the tube bank (6) being connected with tube sheet (5) by fixed mould (4) of shell (1) below and be connected to the temperature sensor (7) on fixed mould (4) by fixed mould (4), restrain (6) and be provided with modified ptfe inner core (8).
2. a kind of fluoroplastics condenser welding equipment according to claim 1, is characterized in that: tube sheet (5) is PFA tube sheet.
3. a kind of fluoroplastics condenser welding equipment according to claim 1 and 2, is characterized in that: tube bank (6) is PFA tube bank.
4. a kind of fluoroplastics condenser welding equipment according to claim 1 and 2, is characterized in that: shell (1) inner side is provided with heat-insulation layer (9), and infrared heater (2) is positioned at heat-insulation layer (9) the inner.
5. a kind of fluoroplastics condenser welding equipment claimed in claim 1, it uses as infrared heater in the welding of fluoroplastics condensation tube bank and tube sheet, and its welding procedure comprises the following steps:
Step 1) PFA and auxiliary material are heated, compression moulding, pressurize moulding, the then demoulding, 2 heat treatment shapings, and Vehicle Processing, numerical control are deployed to ensure effective monitoring and control of illegal activities, cleaning is processed, check and obtain qualified PFA tube sheet;
Step 2) PFA and auxiliary material are through extruding and shaping, and obtain moulding tube bank through 2 pipe heat treatment, 2 pipe sizings;
Step 3) moulding tube bank and PFA tube sheet location, dedusting, sleeve pipe, tack, installs welding external mold, inserts nonmetal inner core, 2 clean processing;
Step 4) installation infrared line heater is also used its fusion weld, and cooling rear check, pulls out inner core, removes welding equipment;
Step 5) pressure check is qualified completes welding job.
6. welding procedure according to claim 5, is characterized in that step 2) in PFA moulding tube bank is carried out to special showing tremendous enthusiasm processing sizing, concrete steps be to be incubated 1 hour at 320 ℃.
7. welding procedure according to claim 5, is characterized in that, it is the nonmetal inner core of polytetrafluoroethylene (PTFE) that built-in nonmetal inner core is restrained in the moulding in step 3), its swelling employing Single cell fusion welding procedure.
8. welding procedure according to claim 5, is characterized in that, the welding temperature of the infrared heater in step 4) is controlled at 323-326 ℃, and be 1-2h its weld interval.
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| CN201410058531.6A CN103817925B (en) | 2014-02-20 | 2014-02-20 | A kind of fluoroplastics condenser welding equipment and welding procedure thereof |
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| CN201410058531.6A CN103817925B (en) | 2014-02-20 | 2014-02-20 | A kind of fluoroplastics condenser welding equipment and welding procedure thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105711078A (en) * | 2016-04-29 | 2016-06-29 | 华南理工大学 | Device and method for welding FEP heat exchange tube with tube plate |
| CN106017149A (en) * | 2016-05-30 | 2016-10-12 | 欧阳顺亮 | Fume heat exchanger and welding method of fume heat exchanger |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105711078A (en) * | 2016-04-29 | 2016-06-29 | 华南理工大学 | Device and method for welding FEP heat exchange tube with tube plate |
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| CN106017149A (en) * | 2016-05-30 | 2016-10-12 | 欧阳顺亮 | Fume heat exchanger and welding method of fume heat exchanger |
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| CN103817925B (en) | 2015-12-30 |
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Denomination of invention: A fluorine plastic condenser welding equipment and its welding process Effective date of registration: 20230921 Granted publication date: 20151230 Pledgee: Agricultural Bank of China Limited by Share Ltd. Jinhua Wucheng branch Pledgor: ZHEJIANG JINFULONG CHEMICAL EQUIPMENT Co.,Ltd. Registration number: Y2023980058035 |