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
  • B23K1/00—Soldering, e.g. brazing, or unsoldering
  • B23K1/012—Soldering with the use of hot gas
  • B23K1/015—Vapour-condensation soldering

Definitions

• the present invention relates to improvements to machines for heating articles or products by condensation of vapors thereon.
• Machines for heating articles or products by condensation of vapors on them are known (see, for example, FR-A-2,243,045, FR-A-2,553,186 and US-A-4,055-217).
• the articles or products are heated to the desired temperature by condensation of primary steam.
• the primary liquid constituting the source of the primary vapor is usually an inert perfluorocarbon liquid with a high boiling point which is very expensive, it is customary to confine the mass of primary vapor with respect to the atmosphere by a mass of vapor secondary generated from a secondary liquid usually a chlorofluorocarbon, with a lower boiling point than the primary liquid.
• the object of the invention is to provide various improvements to the type of machine mentioned above.
• a first improvement aims to lower the content of chlorine and fluorine ions in the primary and secondary vapors of the equipment and resulting from the decomposition of these vapors.
• the invention provides for improved washing of the secondary liquid.
• a sweeping of dry gases interposed between the humid atmospheric air and the secondary vapor opposes the introduction of atmospheric humidity.
• Another improvement consists in compensating variations in the operating regime automatically by controlling the power balance.
• FIG. 1 is a schematic representation of an improved machine
• FIG. 2 is a detailed section of the acid washer shown to the right of Figure 1.
• FIG. 1 schematically shows an example of a machine to which the improvements of the invention can be applied.
• This machine comprises a vertical tank 1, for example of rectangular section, comprising from the bottom up, primary liquid 2 (usually a liquid perfluorocarbon) which can be brought to the boil by one or more heating elements 3 and / or means equivalents (bain-marie), a heating chamber 4 of the article or product to be heated filled, in service, with vapors of the primary liquid; a thermostatically controlled coil 5 for condensing the primary liquid vapors maintained at an intermediate temperature between the boiling points of the primary and secondary liquids; a zone 6 filled with a mass of vapors of a secondary liquid (usually a chlorofluorocarbon) having a boiling point lower than that of the primary liquid, this mass of vapors forming a plug for the vapors of primary liquid; a cooled coil 7 for condensing the secondary liquid vapors.
• secondary steam can be generated by injection of secondary liquid by means of a sprayer boom 8, as shown, connected to a reservoir of secondary liquid. Alternatively, the secondary liquid could be simply mixed with the primary liquid 2.
• the secondary liquid condensed on the coil 7 is collected in a gutter 9 and directed towards the purifier device of FIG. 2 which constitutes one of the improvements of the invention. After purification, the liquid secondary is used to feed the ramp 8 (or is returned to the bottom of the tank in the case of the variant indicated).
• the acid washing device shown in detail in FIG. 2 comprises a first tank 80 placed on the condensate return 80a which passes through a layer of water 81 in order to trap the ions.
• a diffuser 82 divides the condensates into fine droplets before entering the water.
• the water layer is supplied at constant level by an injection of clean water with diffuser 84, at the bottom point of the washer and polluted water outlet at the top at level n3.
• a swan neck 85 on the line 86 for supplying the washing water prevents a return of secondary liquid into the water, which could block the flow meter 87.
• the secondary liquid is taken through a solenoid valve 88b.
• This solenoid valve isolates the tank 80 from the tanks 88 and 89 during the equipment shutdown and start-up periods.
• the tank 88 ensures filling at the start or during operation of the equipment. It is provided with a removable cover 88a for filling.
• the tank 89 acts as a reserve of secondary liquid and for drying it on a molecular sieve 90, in order to eliminate any trace of water. This arrangement makes it possible to eliminate the residual washing water as well as the water introduced in loading of equipment with secondary liquid.
• This sieve can be constituted for example by zeolite forming a crystalline network of silico-aluminate in which monovalent K or Na or diva-slow cations have been introduced, the size of the cations determines the size of the pores which trap water.
• a material of this kind is known under the brand "silliporite".
• Two level controls S1 at 91 and S2 at 92 make it possible to detect the minimum level of operation, requiring filling of the equipment, and the maximum level at the end of filling.
• the metering pump 94 allows the secondary liquid to be recycled to the equipment tank through the spray nozzles 23.
• the level ni determines a volume V 1 in the tray 80.
• the level n2 determines in the tray 88 a volume V 2 such that
• Level n4 is variable during walking.
• a dry gas sweep is made according to the invention on the upper part of the machine tank, which prevents direct contact of atmospheric air with the vapors produced in the tank.
• nozzles 95 distributed over the top of the tank and through which dry air is injected radially.
• the heat balance of the machine is such that the energy transmitted by the heating element or elements to the primary liquid, by the play of primary steam, balances the heat loss of the walls of the tank, causes the evaporation of the secondary liquid , heats the water in the secondary coil and also heats the load.
• the loss of the walls and the energy absorbed by the condensation of the secondary liquid are constants, characteristic of the dimensioning of the equipment.
• the heating of the water will therefore be the result of the energy supply by the heating elements and the absorption of the mass introduced.
• the thermal operation of the machine is regulated by adjusting the power transmitted to the heating elements as a function of the nature of the charge introduced, by controlling the rise in temperature of the water in the coil 7, used to condense the vapors of the secondary liquid.

Landscapes

• Mechanical Engineering (AREA)
• Engineering & Computer Science (AREA)
• Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
• Cleaning By Liquid Or Steam (AREA)
• Mechanical Optical Scanning Systems (AREA)
• Exposure Or Original Feeding In Electrophotography (AREA)
• Detail Structures Of Washing Machines And Dryers (AREA)
• Electric Connection Of Electric Components To Printed Circuits (AREA)
• Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
• Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
• Vending Machines For Individual Products (AREA)
• General Preparation And Processing Of Foods (AREA)
• Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9315894

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (3)

Citations (3)

Family Cites Families (8)

• 1985
  • 1985-02-04 FR FR8501489A patent/FR2577031B2/fr not_active Expired
• 1986
  • 1986-02-03 AT AT86400223T patent/ATE34687T1/de not_active IP Right Cessation
  • 1986-02-03 WO PCT/FR1986/000028 patent/WO1986004533A1/fr not_active Ceased
  • 1986-02-03 JP JP61500805A patent/JPS62500647A/ja active Granted
  • 1986-02-03 DE DE8686400223T patent/DE3660236D1/de not_active Expired
  • 1986-02-03 US US06/921,044 patent/US4708645A/en not_active Expired - Fee Related
  • 1986-02-03 EP EP86400223A patent/EP0192536B1/fr not_active Expired

Patent Citations (3)

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