A refrigeration device, wherein the refrigeration device comprises a compressor, a condenser, an expansion valve, an evaporator, intake electromagnetic valves and exhaust electromagnetic valves, two-position three-way electromagnetic valves or two-position five-way electromagnetic valves, a cylinder group, a volume-variable airproof container, two-position two-way electromagnetic valves, a generator, and a three-way tube;
- the intake electromagnetic valves and the exhaust electromagnetic valves are normally closed valves;
- the cylinder group consists of two or more cylinders, the cylinders are double-acting cylinders, a pipeline from the compressor to the cylinders are wrapped with a heat preservation material, and the cylinders are made of a material with good performance of heat insulation;
- the area affected by a force on a side of the cylinders without a rod is larger than the area affected by a force on a side with a piston rod of the cylinders, the force affected on the side without a rod of the cylinders is larger or equal to the sum of the force affected on the side with the piston rod of the cylinders plus the frictional force of the piston and a cylinder wall, and the area affected by a force on a side with a piston rod of the cylinders is larger or equal to an effective cross-sectional area of a condenser tube;
- an air hole on the side of the cylinders with a piston rod is connected to the volume-variable airproof container, when the refrigeration device is in operation, the gas pressure in the airproof container is equal to or higher than the refrigerant liquefaction pressure of the refrigerant at the environmental temperature, the gas pressure in the airproof container is larger than or equal to an outlet pressure of the compressor;
- an air hole on the side of the cylinders without a rod is connected to one three-way tube, one opening of the three-way tube is connected to the cylinder via one filter, the function of the filter is to prevent impurities from entering into the intake electromagnetic valves and the exhaust electromagnetic valves, the other two openings are respectively connected to the intake electromagnetic valves and the exhaust electromagnetic valves, the intake electromagnetic valves are connected to the compressor, and the exhaust electromagnetic valves are connected to the condenser;
- when the piston is pushed to the top of the cylinder by the refrigerant from the compressor, the intake electromagnetic valves close and the exhaust electromagnetic valves open, the piston is pressed towards the bottom of the cylinder by atmospheric pressure in the airproof container, when the piston is pressed to the bottom of the cylinder by the atmospheric pressure in the airproof container, the exhaust electromagnetic valves close, the intake electromagnetic valves open, and the refrigerant from the compressor enters into the cylinder again;
- the refrigerant flows successively through the compressor, the intake electromagnetic valves, the cylinder group, the exhaust electromagnetic valves, the condenser, the expansion valve and the evaporator and finally enters the compressor from the evaporator, the cylinder group can do work to generate electricity through atmospheric pressure in the volume-variable airproof container and compensates for electric energy consumed by the compressor.