The invention discloses a
solar water heater air pressure emptying freeze-proofing
system mainly comprising the members of a
water storage inner
barrel, a heat preservation shell, a water inlet and outlet
pipe, an overflow air inflation
pipe, an air inflation
pipe, a one-way valve, a switch valve, a pressure pump and the like. When emptying is needed, a water
nozzle at the bottom end of the water inlet and outlet pipe is opened firstly, then the pressure pump is opened,
compressed air enters the water inlet and outlet pipe to squeeze out water, and after the water drains away, the pressure pump is closed. When hot water is used again, the switch valve and the overflow air inflation pipe are made to communicate firstly, then the pressure pump is opened, the
compressed air enters the
water storage inner
barrel, the hot water is squeezed out of the water inlet and outlet pipe, and the pressure pump is closed. Due to the fact that all parts except a pipeline are arranged in the heat preservation shell or indoors, the parts are not frozen A
mechanical valve is adopted instead of an electric valve, so that the defect that the electric valve and a controlling circuit of the electric valve break down frequently is effectively eliminated. In addition, an air pressure pump and a controlling circuit of the air pressure pump are arranged indoors, therefore maintenance is convenient, and normal operation of the air pressure emptying freeze-proofing
system can be fully guaranteed.