Phase change heat storage-type electrical water heater

Abstract

The utility model relates to a phase change heat storage-type electrical water heater, comprising a phase change heat storage device, wherein the phase change heat storage device comprises a housing; the housing is internally filled in with a phase change material; a heat exchange pipe is embedded in the phase change material; the heat exchange pipe has one end connected with a circulating medium inflow pipe and the other end connected with a circulating medium outflow pipe; the circulating medium inflow pipe and the circulating medium outflow pipe are externally connected with a circulating medium backflow pipe there-between; the circulating medium inflow pipe, the heat exchange pipe, the circulating medium outflow pipe and the circulating medium backflow pipe form a circulating system in which a circulating medium flow; the circulating medium backflow pipe is provided with a circulating pump, an electrical heater, a function switching valve and a heat exchanger in turn; and the heat exchanger is provided with a water inlet pipe for heating tap water and a water outlet pipe. Compared with the prior art, the phase change heat storage-type electrical water heater heats water for a long time, has a high yield of hot water, and is safe and reliable.

What is claimed is: 
     
         1 . A phase change heat storage-type electrical water heater, comprising a phase change heat storage device ( 3 ), wherein the phase change heat storage device ( 3 ) comprises a housing; the housing is internally filled in with a phase change material ( 2 ); a heat exchange pipe ( 1 ) is embedded in the phase change material ( 2 ); the heat exchange pipe ( 1 ) has one end connected with a circulating medium inflow pipe ( 14 ) and the other end connected with a circulating medium outflow pipe ( 15 ); the circulating medium inflow pipe ( 14 ) and the circulating medium outflow pipe ( 15 ) are externally connected with a circulating medium backflow pipe ( 16 ) there-between; the circulating medium inflow pipe ( 14 ), the heat exchange pipe ( 1 ), the circulating medium outflow pipe ( 15 ) and the circulating medium backflow pipe ( 16 ) form a circulating system in which a circulating medium flows, characterized in that, the circulating medium backflow pipe ( 16 ) is provided with a circulating pump ( 4 ), an electrical heater ( 5 ), a function switching valve ( 7 ) and a heat exchanger ( 10 ) in turn; and the heat exchanger ( 10 ) is provided with a water inlet pipe ( 12 ) for heating tap water and a water outlet pipe ( 13 ). 
     
     
         2 . The phase change heat storage-type electrical water heater according to  claim 1 , characterized in that the water outlet pipe ( 13 ) is provided with a water flow detector ( 11 ). 
     
     
         3 . The phase change heat storage-type electrical water heater according to  claim 2 , characterized in that the circulating pump ( 4 ), the water flow detector ( 11 ) and the electrical heater ( 5 ) are connected to a controller at the same time. 
     
     
         4 . The phase change heat storage-type electrical water heater according to  claim 2 , characterized in that the water flow detector ( 11 ) is any one or a combination of a water flow switch and a water flow sensor. 
     
     
         5 . The phase change heat storage-type electrical water heater according to  claim 1 , characterized in that the circulating medium backflow pipe ( 16 ) at both ends of the function switch valve ( 7 ) is respectively provided with a circulating medium reserved inflow pipe ( 8 ) and a circulating medium reserved outflow pipe ( 9 ) which are externally connected with auxiliary energy sources. 
     
     
         6 . The phase change heat storage-type electrical water heater according to  claim 1 , characterized in that the circulating medium backflow pipe ( 16 ) is provided with a pressure release valve ( 6 ). 
     
     
         7 . The phase change heat storage-type electrical water heater according to  claim 1 , characterized in that the circulating medium backflow pipe ( 16 ) is provided with a phase change material leak detecting device, and the phase change material leak detecting device is any one or a combination of several ones of an aluminum pipe, a zinc pipe, a magnesium pipe and a PH value tester. 
     
     
         8 . The phase change heat storage-type electrical water heater according to  claim 1 , characterized in that the function switching valve ( 7 ) is any one or a combination of several ones of a ball valve, an electric pipe or an electromagnetic valve. 
     
     
         9 . The phase change heat storage-type electrical water heater according to  claim 1 , characterized in that the circulating medium is any one or a combination of several ones of tap water, distilled water, anti-freezing liquid and heat conducting oil.