Large-temperature-rise two-stage second-class lithium bromide absorption heat pump water heater

The invention relates to a large-temperature-rise two-stage second-class lithium bromide absorption heat pump water heater. The large-temperature-rise two-stage second-class lithium bromide absorption heat pump water heater is composed of a high-temperature side solution circulation process and a low-temperature side solution circulation process which are relatively independent and associated with each other, wherein waste heat water is sequentially connected to a low-temperature evaporator, a high-temperature generator and a low-temperature generator in series; cooling water is sequentially connected to a high-temperature condenser and a low-temperature condenser in series; and internal circulating hot water enters a high-temperature absorber through an internal circulating hot water pump to be heated and then enters a high-temperature evaporator to be cooled. The waste heat water cooling gradient is reasonably utilized, the waste heat water cooling amplitude is increased, the low-temperature side evaporation temperature is guaranteed, the low-temperature absorber can produce high-temperature internal circulating hot water to be used by the high-temperature evaporator, the high-temperature side evaporation temperature is effectively increased, the temperature of hot water entering the high-temperature absorber is increased, and high-grade hot water can be produced to be used by a user. The water heater breaks through the temperature rising amplitude of a common single-effect second-class heat pump, and a larger temperature rising amplitude is achieved.