Control arrangement for a refrigeration apparatus

F - Mech Eng,Light,Heat,Weapons – 25 – B

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F25B 5/02 (2006.01) F25B 49/02 (2006.01) G05D 23/19 (2006.01) F25B 41/04 (2006.01) F25B 41/06 (2006.01)

Patent

CA 2037271

A control arrangement for a refrigeration apparatus has for each evaporator (41, 51, 61) a temperature sensor (46, 56, 66) and an electro-magnetic valve (42, 52, 62) connected upstream of the evaporator and controlled by the temperature sensor, the switch-on time "on" to switch-off time "off" ratio of which electro-magnetic valve is influenced by the associated temperature sensor. A control apparatus (7) has a computation circuit (71) which calculates for each evaporator, as load value B, the relative switch-on ratio on and adjusts the ' on + off output of the compressor arrangement (1) so that the greatest load value Bmax is close to 1. That allows operation with a compressor output that is very low under the given load conditions.

Dispositif de commande pour appareil de réfrigération dans lequel chaque évaporateur (41, 51 et 61) comporte une sonde de température (46, 56 et 66) et une électrovanne (42, 52 et 62) raccordée en amont de l'évaporateur et commandée par la sonde de température; le rapport cyclique de marche-arrêt de chaque électrovanne est déterminé par la sonde de température qui lui est associée. Un appareil de régulation (7) comporte un circuit de calcul (71) qui calcule, à titre de facteur de charge B, le rapport relatif de mise en circuit et qui règle le débit compresseur (1) de telle sorte que le facteur de charge B le plus important soit au voisinage de 1. Ceci assure un fonctionnement avec un très bas débit compresseur compte tenu des conditions de charge.

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