Patent ID: 7565808

Claim:
A refrigerator comprising: an inlet device for receiving a flow of gas under pressure, the inlet device having a cylindrical interior surface bounding an inlet chamber outwardly, a gas flow generator having a cylindrical exterior surface bounding the inlet chamber inwardly and also having a cylindrical interior surface bounding a gas flow chamber, the gas flow generator having inclined passages that provide communication between the inlet chamber and the gas flow chamber, so that gas under pressure in the inlet chamber flows through the passages and into the gas flow chamber, an energy transfer tube having first and second ends and having a cylindrical interior space in communication with the gas flow chamber, the second end of the energy transfer tube having a least one port at a location adjacent to the tube for allowing gas to escape from inside the energy transfer tube, wherein an inner portion of each passage of the generator lies in a plane inclined at an angle in the range of 4 degrees to 30 degrees to a plane perpendicular to a central axis of the energy transfer tube, wherein each passage is not straight but rather is curved, the refrigerator being configured such that an acoustic tone is spontaneously generated in the energy transfer tube when gas at a pressure exceeding about 100 psig is supplied to the inlet chamber.