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CN-121993925-A - Multi-connected heat pump system

CN121993925ACN 121993925 ACN121993925 ACN 121993925ACN-121993925-A

Abstract

The application provides a multi-connected heat pump system, which relates to the technical field of household appliances and is used for realizing flexible switching and combination of a plurality of working modes such as a heating mode, a refrigerating mode, a domestic hot water mode and the like. The multi-connected heat pump system comprises a refrigerant circulation loop, a target valve assembly and a controller, wherein the refrigerant circulation loop circulates a refrigerant in a loop formed by a compressor, a plurality of heat exchangers, a liquid storage tank, a plurality of expansion valves, a four-way valve, a three-way valve and the target valve assembly, the liquid storage tank is used for providing a refrigerant collecting point for the refrigerant in a refrigerant flow path among the plurality of heat exchangers, the target valve assembly is used for controlling the on-off state of the refrigerant flow path where a domestic hot water heat exchanger is located, the controller is configured to control the working state of the four-way valve and the on-off state of the target valve assembly and the plurality of electronic expansion valves according to a first working mode indicated by a first control instruction, and the first working mode represents a combined working mode of any two functions of a heating function, a refrigerating function and a domestic hot water function.

Inventors

  • ZHONG WENCHAO

Assignees

  • 海信（广东）空调有限公司

Dates

Publication Date
20260508
Application Date
20260130

Claims (10)

  1. 1. A multiple heat pump system, comprising: A refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the plurality of heat exchangers, the liquid storage tank, the plurality of expansion valves, the four-way valve, the three-way valve and the target valve assembly; the plurality of heat exchangers comprises a first heat exchanger, a second heat exchanger and a third heat exchanger; The liquid storage tank is arranged on a refrigerant flow path among the first heat exchanger, the second heat exchanger and the third heat exchanger and is used for providing a refrigerant collecting point for a refrigerant in a refrigerant flow path among the first heat exchanger, the second heat exchanger and the third heat exchanger; The plurality of expansion valves comprise a first expansion valve, a second expansion valve and a third expansion valve, the first expansion valve is arranged on a first refrigerant branch between the first heat exchanger and the liquid storage tank, the second expansion valve is arranged on a second refrigerant branch between the second heat exchanger and the liquid storage tank, and the third expansion valve is arranged on a third refrigerant branch between the third heat exchanger and the liquid storage tank; the four-way valve is characterized in that a first port of the four-way valve is connected with an exhaust pipe of the compressor, a second port of the four-way valve is connected with the third heat exchanger, a third port of the four-way valve is connected with the first heat exchanger through the three-way valve, and a fourth port of the four-way valve is connected with an air return pipe of the compressor; The third port is connected with the first heat exchanger, the fourth port is connected with the third port, and the fifth port is connected with the air return pipe of the compressor; The target valve assembly is arranged on a refrigerant flow path between the exhaust pipe of the compressor and the second heat exchanger; The water tank is used for storing domestic hot water, and at least one part of a water pipe connected with the water tank is in heat conduction contact with the second heat exchanger; The controller is used for controlling the operation of the controller, the controller is configured to: Receiving a first control instruction, wherein the first control instruction is used for indicating and controlling the multi-connected heat pump system to be in a first working mode, and the first working mode represents a combined operation mode of any two functions of a heating function, a refrigerating function and a domestic hot water function; and according to the first working mode, controlling the working state of the four-way valve and the switching states of the target valve assembly and the plurality of electronic expansion valves so as to enable the multi-connected heat pump system to be in the first working mode.
  2. 2. The multiple heat pump system of claim 1, wherein the first operating mode characterizes a combined operating mode of a heating function and a domestic hot water function, the controller being configured to: detecting whether the initial water temperature of the hot water stored in the water tank is smaller than or equal to a preset first threshold value; When the initial water temperature is less than or equal to the first threshold value, controlling the four-way valve to be switched to a heating state and the third port to be in a closing state, controlling the sixth port and the seventh port of the three-way valve to be in a conducting state, and controlling the target valve assembly and the expansion valves to be in a conducting state; When the four-way valve is in a heating state, part of refrigerant flowing out of the compressor flows to the third heat exchanger through the first port and the second port, flows through the third refrigerant branch and is converged into the liquid storage tank, and the refrigerant in the liquid storage tank flows to the first heat exchanger through the first refrigerant branch and flows into the compressor through the sixth port and the seventh port; And under the condition that the target valve assembly is in a conducting state, the other part of refrigerant flowing out of the compressor flows to the second heat exchanger through the target valve assembly, flows through the second refrigerant branch and is converged into the liquid storage tank.
  3. 3. The multiple heat pump system of claim 2, wherein the controller is further configured to: Detecting the real-time water temperature of hot water in the water tank; Calculating a temperature difference between the real-time water temperature and a set water temperature of a user; and adjusting the opening degree of the second expansion valve according to the temperature difference value.
  4. 4. The multiple heat pump system of claim 2, wherein the controller is further configured to: Receiving a second control instruction, wherein the second control instruction is used for indicating the demand degree of the heating demand and the hot water demand of a user under the condition that the first working mode represents the combined operation mode of the heating function and the domestic hot water function; and adjusting the opening degree of the second expansion valve according to the heating requirement and the requirement degree of the hot water requirement.
  5. 5. The multiple heat pump system according to claim 2, the multi-connected heat pump system is characterized by further comprising: the economizer is arranged between the liquid storage tank and the first expansion valve and is used for cooling the middle-temperature high-pressure liquid refrigerant into a supercooled high-pressure liquid refrigerant; the environment temperature sensor is used for measuring the environment temperature of the outdoor environment where the multi-connected heat pump system is located; the plurality of expansion valves further comprise a fourth expansion valve, wherein the fourth expansion valve is arranged between the first expansion valve and the economizer, and a fourth refrigerant branch is formed between the fourth expansion valve and the compressor; the controller is further configured to: Controlling the fourth expansion valve to be in a conducting state under the condition that the ambient temperature is less than or equal to a preset temperature; And when the fourth expansion valve is in a conducting state, after the refrigerant in the liquid storage tank flows through the economizer, one part of the refrigerant flows to the first heat exchanger through the first refrigerant branch, and the other part of the refrigerant flows back to the compressor through the fourth refrigerant branch.
  6. 6. The multiple heat pump system of claim 1, wherein the first mode of operation characterizes a combined mode of operation of a refrigeration function and a domestic hot water function, the controller being configured to: Detecting whether the initial water temperature of the hot water stored in the water tank is smaller than or equal to a preset second threshold value; controlling the four-way valve to switch to a refrigeration state and the first port and the third port of the four-way valve to be in a closed state, controlling the target valve assembly to be in a conducting state, controlling the second expansion valve and the third expansion valve to be in a conducting state, and controlling the first expansion valve to be in a closed state when the initial water temperature is less than or equal to the second threshold; under the condition that the target valve assembly is in a conducting state, refrigerant flowing out of the compressor flows to the second heat exchanger through the target valve assembly, flows through the second refrigerant branch and is converged into the liquid storage tank; Under the condition that the four-way valve is controlled to be switched to a refrigerating state and the first port and the third port of the four-way valve are in a closed state, the refrigerant in the liquid storage tank sequentially flows through the third heat exchanger, the second port and the fourth port through the third refrigerant branch and flows into the compressor.
  7. 7. The multiple heat pump system of claim 6, wherein the controller is further configured to: receiving a third control instruction, wherein the third control instruction is used for indicating the demand degree of the refrigeration demand and the hot water demand of a user under the condition that the first working mode represents a combined operation mode of the refrigeration function and the domestic hot water function; when the demand level of the hot water demand is smaller than the demand level of the refrigeration demand, controlling the four-way valve to switch to a refrigeration state and the first port and the third port of the four-way valve to be in an open state, controlling the fifth port and the sixth port of the three-way valve to be in a conducting state, controlling the first expansion valve to be in a conducting state, and reducing the opening of the second expansion valve; And when the four-way valve is switched to a refrigerating state and the first port and the third port of the four-way valve are in an opening state, part of refrigerant flowing out of the compressor flows to the first heat exchanger through the first port, the third port, the fifth port and the sixth port, and flows into the liquid storage tank from the first heat exchanger through the first refrigerant branch.
  8. 8. The multiple heat pump system of claim 2 or 6, wherein the controller is further configured to: Detecting the real-time water temperature of hot water in the water tank; and under the condition that the real-time water temperature is larger than a preset third threshold value, controlling the four-way valve to be in a heating state or a refrigerating state and controlling the target valve assembly to be in a closing state.
  9. 9. The multiple heat pump system of claim 1, wherein the first operating mode characterizes a combined operating mode of a heating function and a cooling function, the second heat exchanger and the third heat exchanger are respectively disposed in different rooms, and the controller is configured to: Controlling the four-way valve to be switched to a refrigerating state, wherein a first port and a third port of the four-way valve are in a closed state, controlling the target valve assembly to be in a conducting state, controlling the second expansion valve and the third expansion valve to be in a conducting state, and controlling the first expansion valve to be in a closed state; under the condition that the target valve assembly is in a conducting state, refrigerant flowing out of the compressor flows to the second heat exchanger through the target valve assembly, flows through the second refrigerant branch and is converged into the liquid storage tank; Under the condition that the four-way valve is controlled to be switched to a refrigerating state and the first port and the third port of the four-way valve are in a closed state, the refrigerant in the liquid storage tank sequentially flows through the third heat exchanger, the second port and the fourth port through the third refrigerant branch and flows into the compressor.
  10. 10. The multiple heat pump system of claim 9, wherein the controller is configured to: Calculating the first heat exchange amount of the second heat exchanger and the second heat exchange amount of the third heat exchanger; Controlling a sixth port and a seventh port of the three-way valve to be in a conducting state and controlling the first expansion valve to be in a conducting state under the condition that the first heat exchange amount is larger than the second heat exchange amount; Wherein, when the first expansion valve is in a conducting state and the sixth port and the seventh port of the three-way valve are in a conducting state, part of the refrigerant in the liquid storage tank flows through the first heat exchanger, the sixth port and the seventh port in sequence through the first refrigerant branch and flows into the compressor, or When the first heat exchange amount is smaller than the second heat exchange amount, the four-way valve is controlled to be switched to a refrigerating state, the first port and the third port of the four-way valve are in an opening state, the fifth port and the sixth port of the three-way valve are controlled to be in a conducting state, and the first expansion valve is controlled to be in a conducting state; And when the four-way valve is switched to a refrigerating state and the first port and the third port of the four-way valve are in an opening state, part of refrigerant flowing out of the compressor flows to the first heat exchanger through the first port, the third port, the fifth port and the sixth port, and flows into the liquid storage tank from the first heat exchanger through the first refrigerant branch.

Description

Multi-connected heat pump system Technical Field The application relates to the technical field of household appliances, in particular to a multi-connected heat pump system. Background With the improvement of people's demands for comfort of life and energy efficiency, heat pump systems capable of both space conditioning (cooling/heating) and domestic hot water supply are receiving attention. However, conventional multi-function heat pumps often have some limitations in that they are typically operated in a single mode only, and it is difficult to simultaneously meet diverse energy requirements. For example, in summer, the condensation heat generated when the system is used for indoor refrigeration is often directly discharged to the outside, so that energy waste is caused, and in spring and autumn, a user may have both light heating and hot water requirements, so that the traditional heat pump system is difficult to efficiently cope. Disclosure of Invention The application provides a multi-connected heat pump system which is used for realizing flexible switching and combination of various working modes such as a heating mode, a refrigerating mode, a domestic hot water mode and the like and meeting diversified energy requirements. The application is realized by the following modes: The embodiment of the application discloses a multi-connected heat pump system, which comprises a refrigerant circulation loop, a heat pump control system and a control system, wherein the refrigerant circulation loop circulates in a loop formed by a compressor, a plurality of heat exchangers, a liquid storage tank, a plurality of expansion valves, a four-way valve, a three-way valve and a target valve assembly; the plurality of heat exchangers comprises a first heat exchanger, a second heat exchanger and a third heat exchanger, the liquid storage tank is arranged on a refrigerant flow path between the first heat exchanger, the second heat exchanger and the third heat exchanger and is used for providing a refrigerant collecting point for refrigerant in a refrigerant flow path between the first heat exchanger, the second heat exchanger and the third heat exchanger, the plurality of expansion valves comprise a first expansion valve, a second expansion valve and a third expansion valve, the first expansion valve is arranged on a first refrigerant branch path between the first heat exchanger and the liquid storage tank, the second expansion valve is arranged on a second refrigerant branch path between the second heat exchanger and the liquid storage tank, the third expansion valve is arranged on a third refrigerant branch path between the third heat exchanger and the third heat exchanger, the four-way valve is connected with an exhaust pipe of the four-way valve and the compressor, the second port is connected with the third heat exchanger, the three-way valve is connected with the three-way valve through a third port, the three-way valve is connected with the three-way valve, the three-way valve is connected with the three-way valve, at least one part of a water pipe connected with the water tank is in heat conduction contact with the second heat exchanger; The controller is configured to receive a first control instruction, the first control instruction is used for indicating and controlling the multi-connected heat pump system to be in a first working mode, the first working mode represents a combined operation mode of any two functions of a heating function, a refrigerating function and a domestic hot water function, the working state of the four-way valve is controlled according to the first working mode, and the switching states of the target valve assembly and the plurality of electronic expansion valves are controlled so that the multi-connected heat pump system is in the first working mode. In the embodiment of the application, the working states of the four-way valve, the target valve component and the switching states of the plurality of electronic expansion valves are controlled to realize flexible switching and combination of various working modes such as a heating mode, a refrigerating mode, a domestic hot water mode and the like, so as to meet diversified energy consumption requirements. In one possible implementation, the first working mode represents a combined working mode of a heating function and a domestic hot water function, and the controller is configured to detect whether an initial water temperature of hot water stored in the water tank is smaller than or equal to a preset first threshold value, and if the initial water temperature is smaller than or equal to the first threshold value, control the four-way valve to be switched to a heating state and the third port to be in a closed state, control the sixth port and the seventh port of the three-way valve to be in a conducting state, and control the target valve assembly and the expansion valves to be in a conducting state; When the four-way valve is in a heat