Patent ID: 7536867

Claim:
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: pressure regulating means for keeping the pressure of refrigerant to be supplied to the evaporator at a specified low pressure; an outlet temperature sensor for sensing refrigerant temperature at an outlet of the evaporator; motor controlling means for controlling the rotational speed of the motor that drives the compressor in response to the refrigerant temperature at the outlet of the evaporator sensed by the outlet temperature sensor and thereby performing feedback control such that the refrigerant temperature at the outlet of the evaporator is kept at a specified refrigerant outlet temperature, resulting in the degree of superheat of refrigerant in the evaporator being kept at a predetermined constant value; a water temperature sensor for sensing temperature of water to be supplied to the freezing cylinder; and refrigerant outlet temperature change controlling means for decreasing the specified refrigerant outlet temperature as the sensed water temperature rises.