Patent ID: 7743618
Filing Date: 2010-06-29
Classification: F25B,F25C

Abstract:
1. An auger type ice making machine provided with a freezing cylinder which has an evaporator on its outer peripheral surface and into which water used for making ice is supplied, an ice-scraping auger for scraping ice formed on an inner surface of the freezing cylinder, an auger motor for driving the ice-scraping auger, a freezing apparatus which includes a compressor, a condenser and the evaporator and circulates refrigerant discharged from the compressor through the condenser and the evaporator to cool the freezing cylinder, and a motor which drives the compressor, the auger type ice making machine comprising: a variable control valve being interposed between the condenser and the evaporator; the opening of the variable control valve being electrically controlled and changed; an outlet temperature sensor for sensing refrigerant temperature at an outlet of the evaporator; an inlet temperature sensor for sensing refrigerant temperature at an inlet of the evaporator; superheat calculating means for subtracting the sensed refrigerant temperature at the inlet of the evaporator from the sensed refrigerant temperature at the outlet of the evaporator and thereby obtaining the degree of superheat of refrigerant in the evaporator; valve opening controlling means for controlling the opening of the variable control valve such that the calculated degree of superheat is kept at a specified degree of superheat; an ambient temperature sensor for sensing ambient temperature; and superheat change controlling means for decreasing the specified degree of superheat as the sensed ambient temperature rises.