The present invention relates to an ammonia pump automatic fluid infusion continuous constant pressure technology which is characterized in that between the input terminal and the output terminal of said ammine pump there are connected in turns with an automatic fluid infusion tube, a master valve, an electromagnetic valve, a pressure regulator valve and an automatic fluid infusion driver tube, a lower fluid tube of a circulation barrel is connected in parallel to the automatic fluid infusion tube, a high-pressure ammoniacal liquor tube is connected with the entrance end of the master valve. Said invention possesses the advantages that it can ensure the continuous solution feeding by the ammine pump; when the liquid to the ammine pump is stopped, the automatic fluid infusion from the pump to the import of the ammine pump is continuous by depending on ammoniacal liquor under higher pressures such as medium-pressure of 0.25 mpa or throttling high pressure, then the air and accumulated oil inside the pump is extruded to fall the ammine pump to normal. Since the ammine pump does not lack fluid during the fluid infusion course, the ensure of ammine pump lubricating facilitates the continuance of the entire refrigerating cycle. A supplementary solution feeding tube is connected in parallel to the entrance end of the ammine pump or the liquor feeding tube intersection ahead of the filter, which is controlled by the constant pressure electro-magnetism master valve to automatically switch on and off according to ammine pump outlet pressure, wherein when the ammine pump outlet pressure is lower than the setting value, the fluid infusion is executed automatically to fall the ammine pump to normal. |