CN-122015321-A - Heat pump system, control method for heat pump system, electric appliance and storage medium

Abstract

The application discloses a heat pump system, a control method of the heat pump system, an electric appliance and a storage medium, and relates to the technical field of electric appliances, wherein in the heat pump system, an exhaust port of a compressor, a return port of the compressor, a first heat exchanger, a second heat exchanger and a refrigerant branch are respectively communicated with different valve ports of a five-way valve, and a pipeline between a throttling device and the second heat exchanger is communicated with the refrigerant branch; the five-way valve has a first operation state, a second operation state and a third operation state, wherein the first operation state is that the exhaust port is communicated with the first heat exchanger, the air return port is communicated with the second heat exchanger and the refrigerant branch is blocked from the compressor, the second operation state is that the exhaust port is communicated with the second heat exchanger, the air return port is communicated with the first heat exchanger and the refrigerant branch is blocked from the compressor, and the third operation state is that the exhaust port is communicated with the first heat exchanger, the air return port is communicated with the second heat exchanger and the refrigerant branch is communicated with the exhaust port. The application aims to improve defrosting efficiency and simplify system structure.

Inventors

• QI WENDUAN
• DU FUQUAN
• XU XUEFEI

Assignees

• 广东美的制冷设备有限公司

Dates

Publication Date

20260512

Application Date

20241111

Claims (20)

1. 1. The heat pump system is characterized by comprising a compressor, a five-way valve, a refrigerant branch and a first heat exchanger, a throttling device and a second heat exchanger which are sequentially connected, wherein an exhaust port of the compressor, a return port of the compressor, the first heat exchanger, the second heat exchanger and a first end of the refrigerant branch are respectively communicated with different valve ports of the five-way valve, and a pipeline between the throttling device and the second heat exchanger is communicated with a second end of the refrigerant branch; the five-way valve has a first operating state, a second operating state, and a third operating state: The exhaust port is communicated with the first heat exchanger, the air return port is communicated with the second heat exchanger, and the refrigerant branch is blocked from the compressor in the first running state; The exhaust port is communicated with the second heat exchanger, the air return port is communicated with the first heat exchanger, and the refrigerant branch is blocked from the compressor in the second running state; And in the third running state, the exhaust port is communicated with the first heat exchanger, the air return port is communicated with the second heat exchanger, and the refrigerant branch is communicated with the exhaust port.
2. 2. The heat pump system of claim 1, wherein the refrigerant leg is provided with a one-way valve configured to be one-way conductive from a first end of the refrigerant leg toward a second end of the refrigerant leg.
3. 3. A control method of a heat pump system, characterized by being applied to the heat pump system according to claim 1 or 2, the method comprising: Controlling the five-way valve to operate in the first operating state; and under the condition that the heat pump system meets the starting condition of a preset defrosting mode, controlling the five-way valve to operate in the third operation state.
4. 4. The method of claim 3, wherein prior to the step of controlling the five-way valve to operate in the third operating state, further comprising: and determining the starting condition of the preset defrosting mode according to the running rotating speed state of the first fan.
5. 5. The method of claim 4, wherein the initiation condition of the preset defrost mode comprises at least one of a temperature of the second heat exchanger being less than a first preset heat exchanger temperature and a temperature change value of the second heat exchanger being less than a first temperature change threshold, an ambient temperature of an environment in which the second heat exchanger is located being less than a first preset ambient temperature, a temperature of the second heat exchanger being less than a second preset heat exchanger temperature, a duration of operation of the five-way valve in the first operational state being greater than or equal to a first time threshold, the defrost mode of last operation of the heat pump system being a preset defrost mode; the step of determining the starting condition of the preset defrosting mode according to the running rotating speed state of the first fan comprises the following steps: And determining at least one of the first preset heat exchanger temperature, the first temperature change threshold, the second preset heat exchanger temperature and the first time length threshold according to the running rotating speed state of the first fan.
6. 6. The method of claim 5, wherein, The first preset heat exchanger temperature when the first fan meets the first rotation speed condition is smaller than the first preset heat exchanger temperature when the first fan does not meet the first rotation speed condition, and/or, The first temperature change threshold value when the first fan meets the first rotation speed condition is smaller than the first temperature change threshold value when the first fan does not meet the first rotation speed condition, and/or, The second preset heat exchanger temperature when the first fan meets the first rotation speed condition is smaller than the second preset heat exchanger temperature when the first fan does not meet the first rotation speed condition, and/or, The first time length threshold value when the first fan meets the first rotation speed condition is smaller than the first time length threshold value when the first fan does not meet the first rotation speed condition; The first rotation speed condition comprises that the running time length of the first fan in a state that the running rotation speed is larger than the preset rotation speed is larger than a second time length threshold value.
7. 7. The method of claim 5, wherein the preset start-up conditions for the defrost mode include a first start-up condition for the first defrost mode or a second start-up condition for the second defrost mode; The first preset heat exchanger temperature in the first start-up condition is greater than the first preset heat exchanger temperature in the second start-up condition; a first temperature change threshold in the first start-up condition is greater than a first temperature change threshold in the second start-up condition; The second preset heat exchanger temperature in the first starting condition is greater than the second preset heat exchanger temperature in the second starting condition; The first time length threshold value in the first starting condition is smaller than the first time length threshold value in the second starting condition; the defrosting mode of the heat pump system operated last time in the second starting condition is a preset defrosting mode, and the defrosting mode of the heat pump system operated last time is the first defrosting mode; The frosting thickness of the second heat exchanger corresponding to the first defrosting mode is smaller than that of the second heat exchanger corresponding to the second defrosting mode.
8. 8. The method of claim 3, wherein prior to the step of controlling the five-way valve to operate in the third operating state, further comprising: executing the step of controlling the five-way valve to operate in the third operation state under the condition that the heat pump system meets the starting condition of a preset defrosting mode under the condition that the heating time length of the heat pump system is longer than or equal to a fourth preset time length; The heating time length starts from the start of the heat pump system and the five-way valve starts to run in the first running state.
9. 9. A method as claimed in claim 3, wherein the preset start-up conditions for the defrost mode include a first start-up condition for the first defrost mode or a second start-up condition for the second defrost mode, and wherein the step of controlling the five-way valve to operate in the third operating state is performed by: controlling the heat pump system to operate according to defrosting parameters corresponding to the first defrosting mode under the condition that the heat pump system meets the first starting condition; Controlling the heat pump system to operate according to defrosting parameters corresponding to the second defrosting mode under the condition that the heat pump system meets the second starting condition; Wherein the frosting thickness of the second heat exchanger corresponding to the first defrosting mode is smaller than that of the second heat exchanger corresponding to the second defrosting mode, and the defrosting intensity of the defrosting parameter corresponding to the first defrosting mode is smaller than that of the defrosting parameter corresponding to the second defrosting mode.
10. 10. The method of claim 9, wherein the frequency of the compressor in the first defrosting mode is smaller than the frequency of the compressor in the second defrosting mode, and/or the rotating speed of a first fan corresponding to the first heat exchanger in the first defrosting mode is larger than the rotating speed of the first fan in the second defrosting mode, and/or an electrothermal module in an area where the first heat exchanger is located in the first defrosting mode maintains current state operation, and the electrothermal module in the second defrosting mode is turned off, and/or the shortest operation duration of the first defrosting mode is smaller than the shortest operation duration of the second defrosting mode.
11. 11. The method of claim 3, wherein after the step of controlling the five-way valve to operate in the first operating state, further comprising: Acquiring the ambient temperature of the environment in which the second heat exchanger is located before the heat pump system meets the starting condition of the preset defrosting mode under the condition that the heat pump system meets the starting condition of the preset defrosting mode; during the execution of the step of controlling the five-way valve to operate in the first operation state, the method further comprises: Controlling a second fan corresponding to the second heat exchanger to maintain running under the condition that the ambient temperature meets the preset temperature condition; Controlling the second fan to be closed under the condition that the ambient temperature does not meet the preset temperature condition; the preset temperature condition indicates that the environment where the second heat exchanger is located is sufficient in heat.
12. 12. The method of claim 11, wherein the preset temperature conditions include at least one of: the ambient temperature is greater than a second preset ambient temperature; the environmental temperature is greater than a third preset environmental temperature and less than or equal to the second preset environmental temperature, and the temperature difference value between the environmental temperature and the temperature of the second heat exchanger is greater than a first preset temperature difference; the environmental temperature is larger than a fourth preset environmental temperature and smaller than or equal to the third preset environmental temperature, and the temperature difference value between the environmental temperature and the temperature of the second heat exchanger is larger than a second preset temperature difference; The second preset environmental temperature is greater than the third preset environmental temperature, the third preset environmental temperature is greater than the fourth preset environmental temperature, and the first preset temperature difference is smaller than the second preset temperature difference.
13. 13. A method according to claim 3, wherein said step of controlling said five-way valve to operate in said third operating state in the event that said heat pump system meets a preset defrost mode initiation condition further comprises: Determining an exit condition of the preset defrosting mode according to the running rotating speed state of the first fan corresponding to the first heat exchanger before the heat pump system meets the starting condition of the preset defrosting mode; and under the condition that the heat pump system meets the exit condition of the preset defrosting mode, controlling the five-way valve to operate in the first operation state.
14. 14. The method of claim 13, wherein the exit condition of the preset defrost mode comprises at least one of a temperature of the second heat exchanger being greater than or equal to a third preset heat exchanger temperature; the step of determining the exit condition of the preset defrosting mode according to the running rotation speed state of the first fan corresponding to the first heat exchanger before the heat pump system meets the starting condition of the preset defrosting mode comprises the following steps: And determining the third preset heat exchanger temperature and/or the third duration threshold according to the running rotating speed state of the first fan corresponding to the first heat exchanger before the heat pump system meets the starting condition of the preset defrosting mode.
15. 15. The method of claim 14, wherein, The third preset heat exchanger temperature when the first fan meets the second rotating speed condition is greater than the third preset heat exchanger temperature when the first fan does not meet the second rotating speed condition, and/or, The third duration threshold value when the first fan meets the second rotating speed condition is larger than the third duration threshold value when the first fan does not meet the second rotating speed condition; The second rotating speed condition comprises that the operating time length of the first fan in the state that the operating rotating speed is larger than the preset rotating speed is larger than a fourth time length threshold value.
16. 16. The method of claim 13, wherein the exit condition of the preset defrost mode comprises a first exit condition of a first defrost mode or a second exit condition of a second defrost mode; the third preset heat exchanger temperature in the first exit condition is less than the third preset heat exchanger temperature in the second exit condition; the third duration threshold value in the first exit condition is smaller than the third duration threshold value in the second exit condition; The frosting thickness of the second heat exchanger corresponding to the first defrosting mode is smaller than that of the second heat exchanger corresponding to the second defrosting mode.
17. 17. The method of any one of claims 3 to 16, wherein after the step of controlling the five-way valve to operate in the first operating state, further comprising: Controlling the five-way valve to operate in the second operation state under the condition that the heat pump system meets the judgment condition of the reversing defrosting mode and meets the starting condition of the reversing defrosting mode; judging whether the heat pump system meets the starting condition of the preset defrosting mode or not under the condition that the heat pump system does not meet the judging condition; And the frosting thickness of the second heat exchanger corresponding to the preset defrosting mode is smaller than that of the second heat exchanger corresponding to the reversing defrosting mode.
18. 18. The method of claim 17, wherein the determination condition comprises at least one of: The heating time length reaches a first preset time length, the temperature of the space where the first heat exchanger is located is smaller than a first preset room temperature and lasts for the first time length or the temperature of the space where the first heat exchanger is located is smaller than a second preset room temperature, and the second preset room temperature is smaller than the first preset room temperature; The temperature of the second heat exchanger is smaller than the first preset temperature and lasts for a second duration before the second defrosting mode is exited last time, or the temperature of the second heat exchanger is smaller than the second preset temperature before the second defrosting mode is exited last time, and the second preset temperature is smaller than the first preset temperature; the heating time length reaches a first preset time length, and the temperature change value of the second heat exchanger is smaller than a first preset temperature change value or the temperature of the second heat exchanger is smaller than a third preset temperature; The total time length meeting the third condition and meeting the first condition in the third time length is greater than a first time length threshold, or the total time length meeting the third condition and meeting the second condition in the third time length is greater than a second time length threshold, wherein the first condition comprises that the temperature of the environment where the second heat exchanger is located is smaller than the set environment temperature, the second condition comprises that the temperature of the second heat exchanger is smaller than a fourth preset temperature, and the third condition comprises that a reversing defrosting mode is not operated, and the first time length threshold and the second time length threshold are both smaller than the third time length; the heating time length is counted from the start of the heat pump system and the operation of the five-way valve in the first running state, the third time length is longer than the first preset time length, and the third preset temperature is smaller than the first preset temperature.
19. 19. The method of claim 15, wherein the start-up condition of the reverse defrosting mode comprises: The heating time length reaches a second preset time length, the temperature change value of the second heat exchanger is smaller than a second preset temperature change value and lasts for a fourth time length, and the temperature of the second heat exchanger is smaller than a fifth preset temperature; the heating time length reaches a third preset time length, the temperature change value of the second heat exchanger is smaller than the third preset temperature change value and lasts for a fifth time length, and the temperature of the second heat exchanger is smaller than a sixth preset temperature; The second preset time length and the third preset time length are both longer than the first preset time length, the second preset time length is longer than the third preset time length, the fifth preset temperature is greater than the sixth preset temperature, and the second preset temperature change value and the third preset temperature change value are both smaller than the first preset temperature change value.
20. 20. An appliance comprising a control device and a heat pump system according to claim 1 or 2, the heat pump system being connected to the control device, the control device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the control method of the heat pump system according to any one of claims 3 to 19.

Description

Heat pump system, control method for heat pump system, electric appliance and storage medium Technical Field The present application relates to the field of electrical appliances, and in particular, to a heat pump system, a control method of the heat pump system, an electrical appliance, and a storage medium. Background When the heat pump system heats and runs in a low-temperature environment, the outdoor heat exchanger is easy to generate frosting phenomenon to influence the heating performance of the system. At present, defrosting operation of a heat pump system can be divided into reverse defrosting and forward defrosting, when the reverse defrosting is performed, an outdoor heat exchanger is required to be switched to a condensation state and an indoor heat exchanger is required to be switched to an evaporation state through a four-way valve switching valve position, when the forward defrosting is performed, the valve position of the four-way valve is not switched, the indoor heat exchanger can maintain heat release, and the temperature of the outdoor heat exchanger is increased by increasing the opening of an electronic expansion valve between the indoor heat exchanger and the outdoor heat exchanger or setting a bypass pipeline of exhaust. The mode of increasing the opening degree of the electronic expansion valve has the problem of insufficient defrosting heat because the refrigerant enters the outdoor heat exchanger after circulation, and the mode of arranging the bypass pipeline requires additional components such as a switching valve and the like, thus the structure is complex. Therefore, the problem of insufficient defrosting heat and complex structure exists in the forward defrosting of the current heat pump system. Disclosure of Invention The application mainly aims to provide a heat pump system, a control method of the heat pump system, an electric appliance and a storage medium, and aims to ensure indoor comfort in a defrosting process, improve defrosting efficiency and simplify a system structure. In order to achieve the above object, the present application provides a heat pump system, which comprises a compressor, a five-way valve, a refrigerant branch, and a first heat exchanger, a throttling device and a second heat exchanger which are sequentially connected, wherein an exhaust port of the compressor, a return port of the compressor, the first heat exchanger, the second heat exchanger and a first end of the refrigerant branch are respectively communicated with different valve ports of the five-way valve, and a pipeline between the throttling device and the second heat exchanger is communicated with a second end of the refrigerant branch; the five-way valve has a first operating state, a second operating state, and a third operating state: The exhaust port is communicated with the first heat exchanger, the air return port is communicated with the second heat exchanger, and the refrigerant branch is blocked from the compressor in the first running state; The exhaust port is communicated with the second heat exchanger, the air return port is communicated with the first heat exchanger, and the refrigerant branch is blocked from the compressor in the second running state; And in the third running state, the exhaust port is communicated with the first heat exchanger, the air return port is communicated with the second heat exchanger, and the refrigerant branch is communicated with the exhaust port. In an embodiment, the refrigerant branch is provided with a one-way valve, and the one-way valve is arranged to be in one-way conduction from the first end of the refrigerant branch to the second end of the refrigerant branch. In addition, to achieve the above object, the present application also proposes a control method of a heat pump system, applied to the heat pump system as described above, the method comprising: Controlling the five-way valve to operate in the first operating state; and under the condition that the heat pump system meets the starting condition of a preset defrosting mode, controlling the five-way valve to operate in the third operation state. In an embodiment, before the step of controlling the five-way valve to operate in the third operating state, the method further includes: and determining the starting condition of the preset defrosting mode according to the running rotating speed state of the first fan. In an embodiment, the starting condition of the preset defrosting mode comprises at least one of the following conditions that the temperature of the second heat exchanger is smaller than a first preset heat exchanger temperature and the temperature change value of the second heat exchanger is smaller than a first temperature change threshold value, the ambient temperature of the environment where the second heat exchanger is located is smaller than the first preset ambient temperature, the temperature of the second heat exchanger is smaller than a second preset heat exchan