Cold test chamber for electronic building blocks has fan in front of evaporator with heating coil and meandering channel connected to volume flow regulator and heater

• Main Author: BRUNNER, FRANZ
• Format: Patent
• Language: English; German
• Published: 30.03.2006
• Subjects: BLASTING; COLD ROOMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; CONTROLLING; COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED,LIQUEFIED, OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; HEAT PUMP SYSTEMS; HEATING; ICE-BOXES; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; MECHANICAL ENGINEERING; PHYSICS; REFRIGERATION OR COOLING; REFRIGERATORS; REGULATING; STORING OF DISTRIBUTING GASES OR LIQUIDS; SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES; TESTING; VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED ORSOLIDIFIED GASES; WEAPONS

A cooling fluid (5) e.g. liquid nitrogen passes through a pressure regulator valve (6) and a shutoff valve. It passes into the chamber (1) and flows through a meander-shaped evaporation channel (7). There are a heater coil (8) and a fan (10) adjacent to the evaporation channel. The nitrogen flows through a line (11) to a volume flow regulating valve (13-13''). The evaporated nitrogen flows through a heater (14) to a nozzle (12) releasing nitrogen gas into the chamber. The electronic building block (3) is placed in front of the nozzle. Electric contacts (4) extend through the insulated walls (2) of the chamber. Bei einer Kältetestvorrichtung für elektronische Bauelemente ist eine Kältemittelzufuhrleitung (5) zum Zuführen eines flüssigen Kältemittels, ein Verdampfer (9) sowie eine Kältemittelleitung (11) zum Weitertransport des gasförmigen Kältemittels zu einem elektronischen Bauelement (3) vorgesehen, wobei in der das gasförmige Kältemittel transportierenden Kältemittelleitung (11) ein den Druck und den Volumenstrom des Kältemittels stabilisierender Volumenstromregler (13, 13', 13'') vorgesehen ist.