Integrated water device applied to heat pump system, heat pump system, and control method thereof

Abstract

Provided are integrated water device applied to heat pump system, heat pump system, and control method thereof. The integrated water device includes: main module, auxiliary module, and three-way valve; when the heat pump system simultaneously has heating water demand and air conditioning demand, first end and second end of the three-way valve are controlled to be communicated, so that the heat pump main unit heats the water in the domestic water tank through the main module, and the heat pump auxiliary unit provides heat source or cooling source to the terminal device through the auxiliary module; and, when the heating for the domestic water tank is completed, the first end of the three-way valve is controlled to switch to be communicated with the third end so that the heat pump main unit and the heat pump auxiliary unit jointly provide heat source or cooling source to the terminal device.

1 . An integrated water device applied to a heat pump system, wherein the integrated water device comprises a main module, an auxiliary module, and a three-way valve; the main module is connected to a heat pump main unit of the heat pump system; the auxiliary module is respectively connected to a heat pump auxiliary unit and a terminal device in the heat pump system; a first end of the three-way valve is connected to the main module; a second end is connected to a domestic water tank of the heat pump system; and a third end is connected between the auxiliary module and the terminal device; and
 when the heat pump system simultaneously has a heating water demand and an air conditioning demand, the first end and the second end of the three-way valve are controlled to be communicated, so that the heat pump main unit heats water in the domestic water tank through the main module, and the heat pump auxiliary unit provides a heat source or a cooling source to the terminal device through the auxiliary module; and, when a heating for the domestic water tank is completed, the first end of the three-way valve is controlled to switch to be communicated with the third end, so that the heat pump main unit and the heat pump auxiliary unit jointly provide the heat source or the cooling source to the terminal device. 
 
     
     
         2 . The integrated water device applied to the heat pump system according to  claim 1 , wherein the main module comprises multiple main pipelines arranged in parallel, and each main pipeline is arranged with an electric heater, a first water pump, a first target flow switch, and a first check valve. 
     
     
         3 . The integrated water device applied to the heat pump system according to  claim 2 , wherein the number of the main pipelines are consistent with the number of heat pump main units. 
     
     
         4 . The integrated water device applied to the heat pump system according to  claim 1 , wherein the auxiliary module comprises multiple auxiliary pipelines arranged in parallel, and each auxiliary pipeline is provided with a second water pump, a second target flow switch, and a second check valve. 
     
     
         5 . The integrated water device applied to the heat pump system according to  claim 4 , wherein the number of auxiliary pipelines are consistent with the number of heat pump auxiliary units. 
     
     
         6 . A heat pump system, comprising: at least one heat pump main unit, at least one heat pump auxiliary unit, a domestic water tank, a terminal device, and the integrated water device applied to the heat pump system according to  claim 1 , wherein the heat pump main unit, the heat pump auxiliary unit, the domestic water tank, and the terminal device are all connected to the integrated water device. 
     
     
         7 . The heat pump system according to  claim 6 , wherein the terminal device comprises a buffer water tank and an air conditioning terminal; the buffer water tank is connected to the auxiliary module and the air conditioning terminal, respectively; and the air conditioning terminal comprises at least one of a floor heating coil, a radiator group, and a fan coil. 
     
     
         8 . A control method for a heat pump system, applied to the heat pump system according to  claim 6 , wherein the method comprises:
 controlling, when both the heating water demand and the air conditioning demand are simultaneously acquired, the first end and the second end of the three-way valve to be communicated, and controlling the heat pump main unit and the heat pump auxiliary unit to start operating, so that the heat pump main unit, through the main module, heats the water in the domestic water tank, and the heat pump auxiliary unit, through the auxiliary module, provides the heat source or the cooling source to the terminal device;   acquiring, during operation, a water temperature of the domestic water tank and an indoor environment temperature corresponding to the terminal device, wherein the indoor environment temperature is an indoor environment temperature at a location where the air conditioning terminal is located;   determining whether a heating for the domestic water tank is complete based on the water temperature and a preset water temperature threshold;   determining, if yes, whether to control a switching of the three-way valve, based on the indoor environment temperature and a preset temperature threshold; and   controlling, if yes, the first end of the three-way valve to switch to communicate with the third end, and controlling the heat pump main unit and the heat pump auxiliary unit to continue operation, so that both the heat pump main unit and the heat pump auxiliary unit jointly provide the heat source or the cooling source to the terminal device.   
     
     
         9 . The method according to  claim 8 , wherein the step of determining whether a heating for the domestic water tank is complete based on the water temperature and a preset water temperature threshold comprises:
 determining that the heating for the domestic water tank is complete, when a difference between the water temperature and the preset water temperature threshold is not greater than a first difference threshold.   
     
     
         10 . The method according to  claim 9 , wherein the method further comprises:
 controlling the heat pump main unit to maintain a previous state, when the difference between the water temperature and the preset water temperature threshold is greater than the first difference threshold but not greater than a second difference threshold; or   controlling the heat pump main unit to continue heating the water in the domestic water tank, when the difference between the water temperature and the preset water temperature threshold is greater than the second difference threshold.   
     
     
         11 . The method according to  claim 8 , wherein the step of determining whether to control a switching of the three-way valve, based on the indoor environment temperature and a preset temperature threshold comprises:
 determining to control the switching of the three-way valve, when the air conditioning demand is a cooling demand and when a temperature difference between the indoor environment temperature and the preset temperature threshold is greater than a third difference threshold; or,   determining to control the switching of the three-way valve, when a temperature difference between the indoor environment temperature and the preset temperature threshold is not greater than the third difference threshold but greater than a fourth difference threshold, and a difference between two consecutive indoor environment temperatures within a preset duration is not greater than a fifth difference threshold.   
     
     
         12 . The method according to  claim 8 , wherein the step of determining whether to control a switching of the three-way valve, based on the indoor environment temperature and a preset temperature threshold comprises:
 determining to control the switching of the three-way valve, when the air conditioning demand is a heating demand and when a temperature difference between the indoor environment temperature and the preset temperature threshold is less than a sixth difference threshold; or,   determining to control the switching of the three-way valve, when a temperature difference between the indoor environment temperature and the preset temperature threshold is not less than the sixth difference threshold but less than a seventh difference threshold, and a difference between two consecutive indoor environment temperatures within a preset duration is not less than an eighth difference threshold but less than a ninth difference threshold.   
     
     
         13 . The heat pump system according to  claim 6 , wherein the main module comprises multiple main pipelines arranged in parallel, and each main pipeline is arranged with an electric heater, a first water pump, a first target flow switch, and a first check valve. 
     
     
         14 . The heat pump system according to  claim 13 , wherein the number of the main pipelines are consistent with the number of heat pump main units. 
     
     
         15 . The heat pump system according to  claim 6 , wherein the auxiliary module comprises multiple auxiliary pipelines arranged in parallel, and each auxiliary pipeline is provided with a second water pump, a second target flow switch, and a second check valve. 
     
     
         16 . The heat pump system according to  claim 15 , wherein the number of auxiliary pipelines are consistent with the number of heat pump auxiliary units. 
     
     
         17 . The method according to  claim 8 , wherein the terminal device comprises a buffer water tank and an air conditioning terminal; the buffer water tank is connected to the auxiliary module and the air conditioning terminal, respectively; and the air conditioning terminal comprises at least one of a floor heating coil, a radiator group, and a fan coil.