Ultrasonic freezing equipment and freezing method using same

An ultrasonic freezing equipment, comprising:

• a casing;
• a circulating pump system;
• an ultrasonic generator;
• a vortex-tube freezing device comprising a vortex tube;
• a temperature-measuring device;
• a hydraulic telescopic mast;
• and
• a net cover;
• wherein the casing has a cuboid shape;
• a recess is provided inside the casing;
• the recess is of a hexagonal-prism shape, and comprises six side surfaces connected end to end;
• the recess is configured as a freezing chamber of the ultrasonic freezing equipment, and is configured to accommodate a salt solution;
• the salt solution is configured to immerse a food to be frozen;
• the circulating pump system is in communication with the recess;
• the circulating pump system is configured to perform a circulating flow of the salt solution in the recess;
• a refrigeration coil is arranged in the recess of the casing;
• the vortex tube comprises a vortex chamber, a cold-end tube and a hot-end tube communicated with each other;
• the vortex-tube freezing device is connected to the refrigeration coil;
• the vortex-tube freezing device is configured to adjust a temperature of the salt solution through the refrigeration coil, so as to freeze the food to be frozen in the salt solution;
• the ultrasonic generator is configured to emit an ultrasonic wave to the food to be frozen in the salt solution, so as to reduce a damage during a freezing process;
• the ultrasonic generator comprises six ultrasonic generating plates, and the six ultrasonic generating plates are sequentially arranged on the six side surfaces of the recess;
• the six ultrasonic generating plates consists of a first ultrasonic generating plate, a second ultrasonic generating plate, a third ultrasonic generating plate, a fourth ultrasonic generating plate, a fifth ultrasonic generating plate and a sixth ultrasonic generating plate;
• the first ultrasonic generating plate and the fourth ultrasonic generating plate are configured to emit an ultrasonic wave of 0-20 KHz;
• the second ultrasonic generating plate and the fifth ultrasonic generating plate are configured to emit an ultrasonic wave of 20-40 KHz;
• and the third ultrasonic generating plate and the sixth ultrasonic generating plate are configured to emit an ultrasonic wave of 40-60 KHz;
• a control panel is arranged on the casing, and is configured to control a frequency of the ultrasonic generator;
• the temperature-measuring device is arranged near an inside surface of the ultrasonic generator, and is configured to measure a temperature of the salt solution;
• and
• the net cover is connected to the hydraulic telescopic mast;
• the hydraulic telescopic mast is arranged in the recess, and is connected to a bottom of the recess;
• the hydraulic telescopic mast is telescopic to drive the net cover to move up and down;
• and the net cover is configured to press and fix the food.