High-efficiency low-temperature absorptive refrigerating machine

The invention discloses a high efficient low temperature absorption refrigerating machine, which is a signal grade ammonia absorption refrigeration machine with low refrigeration temperature by utilizing strong solution to recover rectify heat, absorption heat and calorific potential. A medium and low temperature generator is arranged between a high temperature generator and a dephlegmator, which is able to recover the generating heat by utilizing a first solution heat exchanger and a second solution heat exchanger; a medium temperature absorber is positioned between a solution throttle valve and the low temperature generator, which recovers the rectify heat by utilizing the heat exchanger in the dephlegmator and recovers the absorption heat by utilizing the heat exchanger arranged in the medium temperature absorber as well as stores the potential by utilizing an ammonia liquid storage tank and a solution storage tank. By applying simple and reliable calorific potential system, the invention is able to effectively utilize the regenerative energy and the valley electricity and to achieve the refrigeration temperature as 30 DEG C. under zero, and has the advantages of high efficiency, saving energy and steady performance, etc.; therefore, the invention is particularly suitable for occasions needing low refrigeration temperature for freezing or chilling food.