Heat pump system and the control method thereof

Abstract

A heat pump system and a control method thereof. The heat pump system includes a compressor; a heat storage heat exchanger, the pipeline connection of which is configured to be disconnectable from the heat pump system; an indoor heat exchanger and an outdoor heat exchanger; a plurality of throttling elements; and a first type four-way valve and a second type four-way valve, the ports of which are respectively connected to the air inlet and the air outlet of the compressor; the unconnected ports of the first type four-way valve are respectively connected to the outdoor heat exchanger and the heat storage heat exchanger; and the unconnected ports of the second type four-way valve are respectively connected to the indoor heat exchanger and connected to the port connected to the air inlet through a capillary or on-off valve; in a combined defrosting mode, the refrigerant dissipates heat from the indoor heat exchanger and the outdoor heat exchanger respectively.

What is claimed is: 
     
         1 . A heat pump system comprising:
 a compressor with an air inlet and an air outlet;   a heat storage heat exchanger, the pipeline connection of which is configured to be disconnectable from the heat pump system;   an indoor heat exchanger and an outdoor heat exchanger;   a plurality of throttling elements respectively arranged between any two of the indoor heat exchanger, the outdoor heat exchanger and the heat storage heat exchanger; and   a first type four-way valve and a second type four-way valve, the ports of which are respectively connected to the air inlet and the air outlet of the compressor; wherein the unconnected ports of the first type four-way valve are respectively connected to the outdoor heat exchanger and the heat storage heat exchanger; and the unconnected ports of the second type four-way valve are respectively connected to the indoor heat exchanger and connected to the port connected to the air inlet through a capillary or on-off valve;   wherein in a combined defrosting mode, the refrigerant dissipates heat from the indoor heat exchanger and the outdoor heat exchanger respectively, and absorbs heat from the heat storage heat exchanger.   
     
     
         2 . The heat exchange system according to  claim 1 , wherein the plurality of throttling elements include a first throttling element and a second throttling element; and a three-way intersection point is provided on connecting pipelines between the indoor heat exchanger, the outdoor heat exchanger and the heat storage heat exchanger; wherein, the first throttling element is arranged on the first connecting pipeline between the three-way intersection point and the heat storage exchanger; the second throttling element is arranged on the second connecting pipeline between the three-way intersection point and the indoor heat exchanger or the third connecting pipeline between the three-way intersection point and the outdoor heat exchanger. 
     
     
         3 . The heat exchange system according to  claim 1 , wherein the plurality of throttling elements include a first throttling element, a second throttling element and a third throttling element; and a three-way intersection point is provided on the connecting pipelines between the indoor heat exchanger, the outdoor heat exchanger and the heat storage heat exchanger; wherein, the first throttling element is arranged on the first connecting pipeline between the three-way intersection point and the heat storage exchanger; the second throttling element is arranged on the second connecting pipeline between the three-way intersection point and the indoor heat exchanger, and the third throttling element is arranged on the third connecting pipeline between the three-way intersection point and the outdoor heat exchanger. 
     
     
         4 . The heat exchange system according to  claim 1 , wherein in the combined defrosting mode, the refrigerant from the air outlet of the compressor flows through the outdoor heat exchanger, the throttling element, the heat storage heat exchanger and the air inlet of the compressor successively; at the same time, the refrigerant from the air outlet of the compressor, flows through the indoor heat exchanger, the throttling element, the heat storage heat exchanger and the air inlet of the compressor successively. 
     
     
         5 . The heat exchange system according to  claim 1 , wherein the heat storage heat exchanger is configured as a PCM heat exchanger. 
     
     
         6 . A control method for the heat pump system according to  claim 1 , comprising: a combined defrosting mode in which switching the pipeline connection of the first type four-way valve and the second type four-way valve, so that the air outlet of the compressor is connected with the outdoor heat exchanger and the indoor heat exchanger respectively, and the PCM heat exchanger is connected with the air inlet of the compressor; wherein a part of refrigerant from the air outlet of the compressor flows through the outdoor heat exchanger, the throttling element, the heat storage heat exchanger and the air inlet of the compressor successively; at the same time, another part of refrigerant from the air outlet of the compressor flows through the indoor heat exchanger, the throttling element, the heat storage exchanger and the air inlet of the compressor successively. 
     
     
         7 . The control method according to  claim 6 , further comprising: a cooling mode in which switching the pipeline connection of the first type four-way valve and the second type four-way valve, so that the air outlet of the compressor is connected with the outdoor heat exchanger, and the indoor heat exchanger is connected with the air inlet of the compressor; at the same time, the pipeline connection of the heat storage heat exchanger is disconnected in the heat pump system; wherein the refrigerant from the air outlet of the compressor flows through the outdoor heat exchanger, the throttling element, the indoor heat exchanger and the air inlet of the compressor successively. 
     
     
         8 . The control method according to  claim 6 , further comprising: a heating mode in which switching the pipeline connection of the first type four-way valve and the second type four-way valve, so that the air outlet of the compressor is connected with the indoor heat exchanger, and the outdoor heat exchanger is connected with the air inlet of the compressor; at the same time, the pipeline connection of the heat storage heat exchanger is disconnected in the heat pump system; wherein the refrigerant from the air outlet of the compressor flows through the indoor heat exchanger, the throttling element, the outdoor heat exchanger and the air inlet of the compressor successively. 
     
     
         9 . The control method according to  claim 6 , further comprising: a heating and heat storage mode in which switching the pipeline connection of the first type four-way valve and the second type four-way valve, so that the air outlet of the compressor is respectively connected with the indoor heat exchanger and the heat storage heat exchanger, and the outdoor heat exchanger is connected with the air inlet of the compressor; wherein a part of refrigerant from the air outlet of the compressor flows through the indoor heat exchanger, the throttling element, the outdoor heat exchanger and the air inlet of the compressor successively; at the same time, another part of refrigerant from the air outlet of the compressor flows through the heat storage exchanger, the throttling element, the outdoor heat exchanger and the air inlet of the compressor successively.