Heat pump type hot water supplying device

Abstract

The present invention provides a heat pump type hot water supplying device that has solved the inconvenience of an antifreeze operation being not carried out due to the phenomenon of a backflow from a hot water storage tank without increasing the number of components. A control device 70 carries out an antifreeze operation, in which a water pump 23 is operated, if the temperature of water for hot water supply in a hot water supply circuit 20 positioned in a heating unit 50 decreases to a predetermined value or less. The water pump 23 is operated if the temperature of the water for hot water supply in the hot water supply circuit 20 positioned in the heating unit 50 increases while the water pump 23 is in a stopped state.

1 . A heat pump type hot water supplying device comprising:
 a heating unit provided with a heat pump circuit formed by connecting a compressor, a water heat exchanger, a decompressor and an evaporator;   a tank unit provided with a hot water storage tank for storing water for hot water supply;   a hot water supply circuit in which the water for hot water supply in the hot water storage tank is taken out from a lower part of the hot water storage tank by a water pump, circulated into the water heat exchanger and led into an upper part of the hot water storage tank; and   a control device which carries out a boiling operation for heating, by a refrigerant, the water for hot water supply, which circulates through the water heat exchanger, by operating the water pump and the compressor,   wherein the control device carries out an antifreeze operation, in which the water pump is operated, in the case where the temperature of the water for hot water supply in the hot water supply circuit positioned in the heating unit decreases to a predetermined value or lower, and   operates the water pump in the case where the temperature of the water for hot water supply in the hot water supply circuit positioned in the heating unit increases while the water pump is in a stopped state.   
     
     
         2 . The heat pump type hot water supplying device according to  claim 1 , wherein the control device operates the water pump in the case where the temperature of the water for hot water supply in the hot water supply circuit positioned in the heating unit temporarily decreases and then switches to increase while the water pump is in a stopped state. 
     
     
         3 . The heat pump type hot water supplying device according to  claim 1 , wherein the control device operates the water pump in the case where the temperature of the water for hot water supply in the hot water supply circuit positioned in the heating unit increases by a predetermined value or more within a predetermined time while the water pump is in a stopped state. 
     
     
         4 . The heat pump type hot water supplying device according to  claim 1 , wherein the control device operates the water pump in the case where an outside air temperature is a predetermined value or lower and the temperature of the water for hot water supply in the hot water supply circuit positioned in the heating unit increases while the water pump is in a stopped state. 
     
     
         5 . The heat pump type hot water supplying device according to  claim 1 , wherein the control device operates the compressor in the case where the temperature of the water for hot water supply on an inflow side of the water heat exchanger is a predetermined low value despite the water pump having been operated for a predetermined time in the antifreeze operation. 
     
     
         6 . The heat pump type hot water supplying device according to  claim 5 , wherein the control device carries out the antifreeze operation in the case where the temperature of the water for hot water supply in the hot water supply circuit positioned in the heating unit increases while the water pump is in a stopped state. 
     
     
         7 . The heat pump type hot water supplying device according to  claim 1 , wherein the temperature of the water for hot water supply in the hot water supply circuit positioned in the heating unit is the temperature of the water for hot water supply on the inflow side of the water heat exchanger or the temperature of the water for hot water supply on the hot water outflow side of the water heat exchanger. 
     
     
         8 . The heat pump type hot water supplying device according to  claim 1 , wherein the heating unit is disposed at a position that is higher than the position of the tank unit. 
     
     
         9 . The heat pump type hot water supplying device according to  claim 1 , wherein the hot water supply circuit has an inflow pipe, which is positioned between the heating unit and the tank unit to take out the water for hot water supply in the hot water storage tank from the lower part of the hot water storage tank, and an outflow pipe for passing the water for hot water supply, which has circulated through the water heat exchanger, into the upper part of the hot water storage tank, and
 at least a part of the inflow pipe and the outflow pipe is provided at a position that is higher than the position of the tank unit.