Control method of heat pump system, heat pump system and storage medium

Abstract

The invention discloses a control method of a heat pump system, the heat pump system and a storage medium. The heat pump system comprises a refrigerant main path and a refrigerant branch path connected with the refrigerant main path, the refrigerant main path comprises an indoor unit, an outdoor unit and a compressor connected with the indoor unit and the outdoor unit, the refrigerant branch path comprises an energy storage device, and the method comprises the steps that the heat pump system is controlled to operate in a preset mode, acquiring pressure characteristics of the heat pump system; in the preset mode, the energy storage device is in a heat storage state, and an outdoor heat exchanger in the outdoor unit is in an evaporation state; and when the pressure characteristic is larger than a first preset pressure characteristic, an outdoor fan corresponding to the outdoor heat exchanger is controlled to reduce the operation rotating speed. The invention aims to reduce the operation energy consumption of the outdoor fan in the process that the heat pump system operates in the independent heat storage mode.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a control method for a heat pump system, a heat pump system and a storage medium. Background Art

[0002] In addition to using energy to regulate the indoor environment, the heat pump system also has energy storage devices such as water tanks to provide the required energy for other needs. Among them, the heat pump system is generally equipped with a separate heat storage mode, in which the indoor air conditioning is stopped and the heat is stored in the energy storage device alone.

[0003] However, when the heat pump system is in the separate heat storage mode, the speed of the outdoor fan is generally adjusted according to the outdoor ambient temperature. The outdoor ambient temperature is generally relatively stable during the operation of the heat pump system, which will cause the outdoor fan to maintain a fixed speed, which can easily lead to excessively high speed of the outdoor fan and cause energy waste. Summary of the invention

[0004] The main purpose of the present invention is to provide a control method for a heat pump system, a heat pump system and a storage medium, aiming to reduce the operating energy consumption of an outdoor fan during operation of the heat pump system in a separate heat storage mode.

[0005] To achieve the above object, the present invention provides a control method for a heat pump system, wherein the heat pump system comprises a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, wherein the refrigerant main circuit comprises an indoor unit, an outdoor unit, and a compressor respectively connected to the indoor unit and the outdoor unit, and the refrigerant branch circuit comprises an energy storage device, and the control method for the heat pump system comprises the following steps:

[0006] Controlling the heat pump system to run in a preset mode, obtaining a pressure characteristic of the heat pump system that characterizes the system pressure; in the preset mode, the energy storage device is in a heat storage state, and the outdoor heat exchanger in the outdoor unit is in an evaporation state;

[0007] When the pressure characteristic is greater than the first preset pressure characteristic, the outdoor fan corresponding to the outdoor heat exchanger is controlled to reduce the operating speed.

[0008] Optionally, when the pressure characteristic is greater than a first preset pressure characteristic, the step of controlling an outdoor fan corresponding to the outdoor heat exchanger to reduce an operating speed includes:

[0009] When the pressure characteristic is greater than a first preset pressure characteristic, and the pressure characteristic is less than a second preset pressure characteristic, determining a first speed adjustment value according to a pressure difference between the first preset pressure characteristic and the pressure characteristic, and controlling the outdoor fan to reduce the operating speed according to the first speed adjustment value;

[0010] When the pressure characteristic is greater than or equal to the second preset pressure characteristic, and the pressure characteristic is less than the third preset pressure characteristic, controlling the outdoor fan to reduce the operating speed according to a preset rate;

[0011] When the pressure characteristic is greater than or equal to the third preset pressure characteristic, controlling the outdoor fan to reduce the speed to the lowest speed;

[0012] The first preset pressure characteristic is smaller than the second preset pressure characteristic, and the second preset pressure characteristic is smaller than the third preset pressure characteristic.

[0013] Optionally, after the step of controlling the outdoor fan to reduce the speed to the lowest speed, the method further comprises:

[0014] Controlling the outdoor fan to maintain the minimum speed until the current pressure characteristic of the heat pump system representing the current system pressure is less than or equal to a fourth preset pressure characteristic, and returning to the step of controlling the heat pump system to operate in a preset mode to obtain the pressure characteristic of the heat pump system;

[0015] Wherein, the fourth preset pressure characteristic is smaller than the second preset pressure characteristic.

[0016] Optionally, after the step of obtaining the pressure characteristics of the heat pump system, the method further includes:

[0017] When the pressure characteristic is less than or equal to the target pressure characteristic of the heat pump system, controlling the outdoor fan to increase the operating speed;

[0018] When the pressure characteristic is greater than the target pressure characteristic, and the pressure characteristic is less than or equal to the first preset pressure characteristic, controlling the outdoor fan to maintain the current speed;

[0019] Wherein, the target pressure characteristic is smaller than the first preset pressure characteristic.

[0020] Optionally, after the step of controlling the outdoor fan corresponding to the outdoor heat exchanger to reduce the operating speed when the pressure characteristic is greater than the first preset pressure characteristic, the method further includes:

[0021] When the current speed of the outdoor fan is greater than the preset speed, returning to the step of controlling the heat pump system to operate in the preset mode at intervals of a first time length to obtain a pressure characteristic representing the system pressure of the heat pump system;

[0022] When the current speed of the outdoor fan is less than or equal to the preset speed, returning to the step of controlling the heat pump system to operate in the preset mode and obtaining a pressure characteristic representing the system pressure of the heat pump system at an interval of a second time length;

[0023] The first duration is greater than the second duration.

[0024] Optionally, the control method of the heat pump system further includes:

[0025] Controlling the heat pump system to start the preset mode, and obtaining the outdoor ambient temperature and the frequency characteristic value of the compressor;

[0026] Determining an initial rotation speed of the outdoor fan according to the outdoor ambient temperature and the frequency characteristic value;

[0027] When the outdoor fan is controlled to run at the initial speed until a first preset condition is met, the step of controlling the heat pump system to run in a preset mode and obtaining a pressure characteristic representing the system pressure of the heat pump system is executed.

[0028] Optionally, the frequency characteristic value comprises a ratio of a target frequency of the compressor to a maximum frequency of the compressor; and / or,

[0029] The first preset condition includes one of the following conditions:

[0030] The activation duration of the preset mode is greater than or equal to the first preset duration;

[0031] The startup duration of the preset mode is greater than or equal to a second preset duration, and the current pressure characteristic of the heat pump system representing the current system pressure is greater than or equal to a fifth preset pressure characteristic, and the second preset duration is less than the first preset duration.

[0032] Optionally, the step of determining the initial rotation speed of the outdoor fan according to the outdoor ambient temperature and the frequency characteristic value includes:

[0033] When the outdoor ambient temperature is less than or equal to the preset ambient temperature, determining the maximum rotation speed to be the initial rotation speed;

[0034] When the outdoor ambient temperature is greater than the preset ambient temperature, the initial rotational speed is determined within a rotational speed range less than the maximum rotational speed according to the outdoor ambient temperature and the frequency characteristic value.

[0035] Optionally, the heat pump system includes more than one indoor unit, and the control method of the heat pump system further includes:

[0036] Controlling the heat pump system to operate in a preset mode, when the number of the turned-on indoor units among the more than one indoor units changes, obtaining an initial speed of the outdoor fan and an energy demand parameter of the indoor unit that currently has energy demand for the energy storage device, wherein the initial speed is determined according to the outdoor ambient temperature and the frequency characteristic value of the compressor;

[0037] When the energy demand parameter and the initial speed meet a second preset condition, controlling the outdoor fan to run at the initial speed;

[0038] When the energy demand parameter and the initial rotation speed do not satisfy the second preset condition, performing the step of obtaining the pressure characteristic representing the system pressure of the heat pump system;

[0039] The second preset condition includes that the increase amplitude of the energy demand parameter is greater than or equal to a preset amplitude, and the initial rotation speed is greater than or equal to the current rotation speed of the outdoor fan.

[0040] Optionally, the step of obtaining energy requirement parameters includes:

[0041] Obtaining the total energy demand value of all the indoor units that currently have energy demand for the energy storage device and the capacity of the outdoor unit;

[0042] The energy demand parameter is determined according to a ratio of the total energy demand value to the capacity.

[0043] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a heat pump system, the heat pump system comprising a control device, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprising an indoor unit, an outdoor unit and a compressor respectively connected to the indoor unit and the outdoor unit, the refrigerant branch circuit comprising an energy storage device;

[0044] The compressor and the outdoor fan in the outdoor unit are connected to the control device, which includes: a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, the steps of the control method for the heat pump system as described in any one of the above items are implemented.

[0045] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of a heat pump system is stored. When the control program of the heat pump system is executed by a processor, the steps of the control method of the heat pump system as described in any of the above items are implemented.

[0046] The present invention proposes a control method for a heat pump system, which is based on a heat pump system with a refrigerant branch provided with an energy storage device. In this method, when the energy storage device is storing heat and the outdoor heat exchanger is evaporating, the outdoor fan is no longer adjusted according to the outdoor ambient temperature. The pressure characteristic that characterizes the system pressure of the heat pump system can accurately reflect the condensation effect of the heat pump system. An excessively large pressure characteristic indicates that the outdoor heat exchanger absorbs too much heat from the outdoor environment, which exceeds the actual heat storage demand of the energy storage device, and the outdoor fan speed is high. At this time, the outdoor fan reduces the speed of operation, which can reduce the heat absorbed by the outdoor heat exchanger from the outdoor environment, so as to meet the actual heat storage demand of the energy storage device and reduce the energy consumption of the outdoor fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic diagram of the structure of a refrigerant system of an embodiment of a heat pump system of the present invention;

[0048] Figure 2 A schematic diagram of the hardware structure involved in the operation of an embodiment of a heat pump system of the present invention;

[0049] Figure 3 A schematic flow chart of an embodiment of a control method for a heat pump system of the present invention;

[0050] Figure 4 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0051] Figure 5 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0052] Figure 6 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0053] Figure 7 The figure is a flow chart of another optional embodiment of the control method of the heat pump system of the present invention.

[0054] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0055] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0056] An embodiment of the present invention provides a heat pump system.

[0057] In the embodiment of the present invention, refer to Figure 1 and Figure 2 The heat pump system includes a control device 100, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit includes a compressor 1, an indoor unit, an outdoor heat exchanger 3, a throttling device 4 and a reversing component 5, and the refrigerant branch circuit includes an energy storage device 7 and a first control valve 8. The indoor unit, the reversing component 5, the compressor 1, the throttling device 4 and the first control valve 8 are all connected to the control device 100. The heat pump system also includes an outdoor indoor unit, and the outdoor unit includes an outdoor heat exchanger 3 and an outdoor fan corresponding to the outdoor heat exchanger 3. The compressor 1 can also be built into the outdoor unit.

[0058] In this embodiment, the energy storage device 7 includes a water tank, and an external water-using device can be connected to the water tank to utilize the water with energy stored in the energy storage device 7. In other embodiments, the energy storage device 7 can also include other types of devices with energy storage functions. When the refrigerant in the refrigerant branch flows through the energy storage device 7, it can exchange heat with the energy storage material therein, and the energy storage material can absorb and store the energy flowing through the refrigerant.

[0059] In an implementation of this embodiment, one end of the refrigerant branch is connected to the exhaust port of the compressor 1, and the pipeline between the indoor unit and the outdoor heat exchanger 3 is connected to the other end of the refrigerant branch.

[0060] In another implementation of this embodiment, the heat pump system may also be provided with a flow direction regulating member, the pipeline between the indoor unit and the outdoor heat exchanger 3 is connected to the second end of the refrigerant branch, the return air port of the compressor 1, the exhaust port of the compressor 1 and the first end of the refrigerant branch are all connected to the flow direction regulating member, and the refrigerant branch is switched between being connected to the return air port of the compressor 1 and being connected to the exhaust port of the compressor 1 through the flow direction regulating member. The refrigerant branch is connected to the exhaust port of the compressor 1 through one end of the refrigerant branch.

[0061] In this embodiment, the number of indoor units is more than one, and more than one indoor units can be connected in parallel. In other embodiments, the number of indoor units can also be one.

[0062] The indoor unit includes an indoor heat exchanger 21 and a second control valve 22 connected in series with the indoor heat exchanger 21 . The second control valve 22 is connected to a control device 100 . The control device 100 can be used to control the flow rate of refrigerant passing through the indoor heat exchanger 21 .

[0063] The indoor unit, the throttling device 4 and the outdoor heat exchanger 3 are connected in sequence, and the pipeline between the throttling device 4 and the indoor unit is connected to one end of the refrigerant branch. The indoor unit, the outdoor heat exchanger 3, the exhaust port of the compressor 1 and the return air port of the compressor 1 are all connected to the reversing component 5. The reversing component 5 can be used to switch the connection state between the indoor unit and the outdoor heat exchanger 3 and the exhaust port of the compressor 1 and the return air port of the compressor 1.

[0064] In this embodiment, the reversing assembly 5 includes a first reversing valve 51 and a second reversing valve 52. The exhaust port of the compressor 1, the return air port of the compressor 1, and the indoor unit are respectively connected to different valve ports of the first reversing valve 51, and the exhaust port of the compressor 1, the return air port of the compressor 1, and the outdoor heat exchanger 3 are respectively connected to different valve ports of the second reversing valve 52. In one implementation of this embodiment, the first reversing valve 51 is a first four-way valve, and the second reversing valve 52 is a second four-way valve. In another implementation of this embodiment, the first reversing valve 51 is a first three-way valve, and the second reversing valve 52 is a second three-way valve.

[0065] The first reversing valve 51 has a first valve position and a second valve position. In the first valve position, the return air port of the compressor 1 is connected to the indoor heat exchanger 21, and the exhaust port of the compressor 1 is blocked from the indoor heat exchanger 21. In the second valve position, the return air port of the compressor 1 is blocked from the indoor heat exchanger 21, and the exhaust port of the compressor 1 is connected to the indoor heat exchanger 21.

[0066] The second reversing valve 52 has a third valve position and a fourth valve position. In the third valve position, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 3, and the return air port of the compressor 1 is blocked from the outdoor heat exchanger 3; in the fourth valve position, the exhaust port of the compressor 1 is blocked from the outdoor heat exchanger 3, and the return air port of the compressor 1 is connected to the outdoor heat exchanger 3.

[0067] In some embodiments, the reversing assembly 5 may further include a switching valve (not shown), and the reversing assembly 5 (switching valve) may be used to switch the connection state between the energy storage device 7 and the exhaust port of the compressor 1 and the return port of the compressor 1. The switching valve may be a three-way valve or a four-way valve, and the switching valve includes a first switching state and a second switching state; when the switching valve is in the first switching state, the return port of the compressor 1 is connected to the energy storage device 7; when the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7.

[0068] Through the regulation of the first reversing valve 51, the second reversing valve 52, the first control valve 8 and the second control valve 22, the operation modes of the heat pump system include but are not limited to the following modes:

[0069] In the first mode, refer to Figure 1 , the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the fourth valve position, the second control valve 22 is closed, and the first control valve 8 is opened. If the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7, and all the refrigerant discharged from the compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7. The refrigerant flowing out of the refrigerant branch flows through the throttling device 4 and the outdoor heat exchanger 3 in turn and then flows back to the compressor 1. In the first mode, the indoor heat exchanger 21 stops heat exchange, the outdoor heat exchanger 3 is in an evaporating state, the energy storage device 7 is in a condensing state, and all heat is used for heat storage in the energy storage device 7. In the first mode, the energy storage device 7 can store heat separately.

[0070] In the second mode, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the third valve position, the first control valve 8 is opened, and the second control valve 22 is opened. If the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7, a part of the refrigerant discharged by the compressor 1 flows through the outdoor heat exchanger 3 and the throttling device 4 in sequence, and another part of the refrigerant discharged by the compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7. The refrigerant flowing out of the refrigerant branch merges with the refrigerant flowing out of the throttling device 4 and flows into the indoor unit for evaporation and then flows back to the compressor 1. In the second mode, the indoor heat exchanger 21 is in an evaporating state, and the outdoor heat exchanger 3 is in a condensing state. In the second mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the second mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the second mode, the heat absorbed by the outdoor heat exchanger 3 from the environment can be stored in the energy storage device 7. In the second mode, the indoor environment can be cooled while the energy storage device 7 stores heat or the compressor 1 oil in the refrigerant branch can be returned to the compressor 1 while the energy storage device 7 stores heat.

[0071] In the third mode, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the fourth valve position, the first control valve 8 is opened, and the second control valve 22 operates in throttling mode. If the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7, and all the refrigerant discharged from the compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7. A part of the refrigerant flowing out of the refrigerant branch flows through the throttling device 4 and the outdoor heat exchanger 3 in sequence and then flows back to the compressor 1. Another part of the refrigerant flowing out of the refrigerant branch flows through the second control valve 22 and the indoor heat exchanger 21 in sequence and then flows back to the compressor 1. In the third mode, the indoor heat exchanger 21 and the outdoor heat exchanger 3 are both in an evaporating state. In the third mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the third mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the third mode, the heat absorbed by the indoor heat exchanger 21 and the outdoor heat exchanger 3 from their environment can be stored in the energy storage device 7. In the third mode, the indoor environment can be cooled while the energy storage device 7 stores heat.

[0072] In the fourth mode, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the third valve position, the first control valve 8 is closed, and the second control valve 22 is opened. The refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 3, the throttling device 4, the second control valve 22, and the indoor heat exchanger 21 in sequence and then flows back to the compressor 1. In the fourth mode, the indoor heat exchanger 21 is in an evaporating state and the outdoor heat exchanger 3 is in a condensing state. In the fourth mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the fourth mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the fourth mode, the indoor environment can be cooled while the energy storage device 7 stops storing heat.

[0073] In other embodiments, the reversing assembly 5 may also include a third four-way valve, and the exhaust port of the compressor 1, the return air port of the compressor 1, the indoor heat exchanger 21 and the outdoor heat exchanger 3 are respectively connected to different valve ports of the third four-way valve.

[0074] Further, see Figure 1 to Figure 2 The heat pump system also includes a pressure characteristic sensor 03, which is connected to the control device 100. The pressure characteristic sensor 03 is used to detect the pressure characteristics of the heat pump system. In this embodiment, the pressure characteristic sensor 03 is arranged on the exhaust side of the compressor 1 to detect the high-pressure pressure characteristics of the heat pump system. In this embodiment, the pressure characteristic sensor 03 is a temperature sensor, which is used to detect the condensing temperature of the heat pump system (or condenser), and the condensing temperature is used to characterize the condensing pressure of the system; alternatively, the pressure characteristic sensor 03 can also be used for the exhaust temperature of the compressor 1, and the control device 100 can determine the high-pressure pressure characteristics according to the exhaust temperature. In other embodiments, the pressure characteristic sensor 03 can be a pressure sensor.

[0075] Further, see Figure 2 The heat pump system further includes an environment detection module 02, which is connected to the control device 100. The environment detection module 02 can be arranged in an outdoor environment to detect the outdoor environment temperature.

[0076] In the embodiment of the present invention, refer to Figure 2 The control device of the heat pump system includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0077] Those skilled in the art will understand that Figure 2The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0078] like Figure 2 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0079] exist Figure 2 In the device shown, the processor 1001 can be used to call the control program of the heat pump system stored in the memory 1002, and execute the relevant step operations of the control method of the heat pump system in the following embodiment.

[0080] An embodiment of the present invention further provides a control method for a heat pump system, which is applied to the above-mentioned heat pump system.

[0081] Reference Figure 3 , an embodiment of a control method of a heat pump system of the present application is proposed. In this embodiment, the control method of the heat pump system includes:

[0082] Step S10, controlling the heat pump system to run in a preset mode, obtaining a pressure characteristic of the heat pump system that represents the system pressure; in the preset mode, the energy storage device is in a heat storage state, and the outdoor heat exchanger in the outdoor unit is in an evaporation state;

[0083] In this embodiment, one end of the refrigerant branch is connected to the exhaust port of the compressor, and the preset mode is the first mode mentioned above, that is, the separate heat storage mode. The heat pump system can be placed in the separate heat storage mode by regulating the above-mentioned reversing component.

[0084] In this embodiment, the pressure feature includes a high pressure feature that characterizes the high pressure of the system. In other embodiments, the pressure feature may also be an original feature that characterizes the low pressure of the heat pump system or the pressure at other locations, such as a pressure feature that characterizes the inlet pressure of the energy storage device or the outlet pressure of the energy storage device, the inlet pressure of the outdoor heat exchanger or the outlet pressure of the outdoor heat exchanger, and so on.

[0085] The pressure characteristic can be detected by the detection module in the heat pump system, or can be determined based on the data detected by the detection module in the heat pump system. In this embodiment, the pressure characteristic includes the exhaust temperature or the exhaust pressure or the saturation temperature corresponding to the exhaust pressure, and the pressure characteristic can also be the condensation temperature.

[0086] During operation in the preset mode, the data detected by the pressure characteristic sensor can be obtained in real time or at intervals of a set time to obtain the pressure characteristics here.

[0087] Step S20: When the pressure characteristic is greater than the first preset pressure characteristic, the outdoor fan corresponding to the outdoor heat exchanger is controlled to reduce the operating speed.

[0088] The first preset pressure characteristic is specifically the minimum pressure characteristic reached by the pressure characteristic when the outdoor heat exchanger of the preset heat pump system absorbs ambient heat exceeding the heat storage requirement of the energy storage device in a preset mode.

[0089] When the pressure characteristic is greater than the first preset pressure characteristic, it indicates that the heat absorbed by the outdoor heat exchanger of the heat pump system in the preset mode exceeds the heat storage demand of the energy storage device; when the pressure characteristic is less than or equal to the first preset pressure characteristic, it indicates that the heat absorbed by the outdoor heat exchanger of the heat pump system in the preset mode does not exceed the heat storage demand of the energy storage device.

[0090] In the process of reducing the operating speed of the outdoor fan: the outdoor fan speed is reduced according to a preset fixed speed adjustment value, or the outdoor fan speed is reduced according to a speed adjustment value determined according to actual operating state parameters of the heat pump system (for example, the pressure difference between the first preset pressure characteristic and the pressure characteristic), or the outdoor fan speed is reduced according to a preset fixed speed, or the outdoor fan is controlled to be reduced to a preset target speed (for example, a minimum speed, etc.), and so on.

[0091] Furthermore, after step S20, the process may return to step S10.

[0092] A control method for a heat pump system proposed in an embodiment of the present invention is based on a heat pump system with a refrigerant branch provided with an energy storage device. In this method, when the energy storage device is storing heat and the outdoor heat exchanger is evaporating, the outdoor fan is no longer adjusted according to the outdoor ambient temperature. The pressure characteristic characterizing the system pressure of the heat pump system can accurately reflect the condensation effect of the heat pump system. An excessively large pressure characteristic indicates that the outdoor heat exchanger absorbs too much heat from the outdoor environment, exceeding the actual heat storage demand of the energy storage device, and the outdoor fan speed is high. At this time, the outdoor fan reduces the speed of operation, which can reduce the heat absorbed by the outdoor heat exchanger from the outdoor environment, so as to meet the actual heat storage demand of the energy storage device and reduce the energy consumption of the outdoor fan.

[0093] Further, based on the above embodiment, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, referring to Figure 4 , the step S20 comprises:

[0094] Step S21, when the pressure characteristic is greater than a first preset pressure characteristic, and the pressure characteristic is less than a second preset pressure characteristic, determining a first speed adjustment value according to a pressure difference between the first preset pressure characteristic and the pressure characteristic, and controlling the outdoor fan to reduce the operating speed according to the first speed adjustment value;

[0095] A corresponding relationship (such as a calculation formula, a mapping relationship, etc.) between the pressure difference and the first speed adjustment value may be established in advance, and the speed adjustment value corresponding to the current pressure difference may be determined based on the corresponding relationship.

[0096] Furthermore, more than one correspondence relationship between the pressure difference and the first speed adjustment value is pre-set, and a target correspondence relationship among the more than one correspondence relationships can be determined according to the temperature change rate of the energy storage device and / or the temperature of the refrigerant heat dissipation module set between the first control valve and the throttling device, and the first speed adjustment value corresponding to the pressure difference is determined based on the target correspondence relationship.

[0097] The first speed adjustment value may be a speed adjustment amplitude or a speed adjustment coefficient. In this embodiment, the first speed adjustment value is a speed adjustment amplitude, and the sum of the current speed of the outdoor fan and the speed adjustment amplitude is used as the target speed of the outdoor fan, and the outdoor fan is controlled to run at the target speed.

[0098] When the pressure characteristic is greater than the first preset pressure characteristic, and the pressure characteristic is less than the second preset pressure characteristic, the first speed adjustment value is determined according to the pressure difference between the first preset pressure characteristic and the pressure characteristic, and the outdoor fan is controlled to reduce the operating speed according to the first speed adjustment value (step S21) and is periodically executed. The period can be 40 seconds.

[0099] Step S22, when the pressure characteristic is greater than or equal to the second preset pressure characteristic, and the pressure characteristic is less than the third preset pressure characteristic, controlling the outdoor fan to reduce the operating speed according to a preset rate;

[0100] The second preset pressure characteristic is specifically a preset pressure characteristic critical value for distinguishing the extent to which the heat absorbed by the outdoor heat exchanger of the heat pump system exceeds the heat storage demand of the energy storage device in the preset mode. The second preset pressure characteristic can be a preset fixed value, or a value determined according to the actual operation of the heat pump system (such as the outdoor ambient temperature and / or the temperature of the energy storage device, etc.).

[0101] In this embodiment, the preset rate is a preset fixed rate, for example, reducing the current rotation speed of the outdoor fan by 30% every 40 seconds.

[0102] When the pressure characteristic is greater than or equal to the second preset pressure characteristic, and the pressure characteristic is less than the third preset pressure characteristic, the step of controlling the outdoor fan to reduce the operating speed at a preset rate (step S22) is performed periodically, and the cycle can be 40 seconds.

[0103] In other embodiments, the preset rate may be determined from more than one preset fixed frequency according to actual operating parameters of the heat pump system (eg, outdoor ambient temperature and / or temperature of the energy storage device, etc.).

[0104] Step S23, when the pressure characteristic is greater than or equal to the third preset pressure characteristic, control the outdoor fan to reduce to the minimum speed; wherein the first preset pressure characteristic is smaller than the second preset pressure characteristic, and the second preset pressure characteristic is smaller than the third preset pressure characteristic.

[0105] The third preset pressure characteristic is specifically a pressure characteristic critical value used to distinguish whether the heat pump system has a reliable risk. The second preset pressure characteristic can be a preset fixed value, or a value determined according to the actual operation of the heat pump system (such as the outdoor ambient temperature and / or the temperature of the energy storage device and / or the compressor frequency, etc.).

[0106] When the pressure characteristic is greater than or equal to the third preset pressure characteristic, the control of the outdoor fan to reduce to the minimum speed (step S23) is executed immediately. In another embodiment, when the pressure characteristic is greater than or equal to the third preset pressure characteristic, the time for executing the control of the outdoor fan to reduce to the minimum speed (step S23) is less than a preset value, and the preset value is less than the execution cycle of step S21 and step S22.

[0107] It should be noted that the execution order of step S21 to step S23 is not specifically limited.

[0108] In this embodiment, the pressure characteristic is greater than the first preset pressure characteristic and is less than the second preset pressure characteristic, indicating that at this time, the degree of heat absorbed by the outdoor heat exchanger from the environment exceeds the heat storage demand of the energy storage device to a small extent. At this time, the speed adjustment value determined by the pressure difference is adapted to reduce the speed of the outdoor fan, and the outdoor fan can be adapted to the pressure difference for intermittent fine adjustment, so as to ensure that after the outdoor fan speed is adjusted, the energy consumption of the outdoor fan is reduced while the energy storage efficiency of the energy storage device is guaranteed; when the pressure characteristic is greater than the first preset pressure characteristic, the pressure characteristic is greater than or equal to the second preset pressure characteristic and less than the third preset temperature, indicating that at this time, the degree of heat absorbed by the outdoor heat exchanger from the environment exceeds the heat storage demand of the energy storage device to a large extent, but the heat pump system does not have a risk of reliable operation. At this time, the outdoor fan is controlled to reduce the operating speed according to the preset rate, and the speed of the outdoor fan can continue to decrease, which is conducive to quickly reducing the energy consumption of the outdoor fan while ensuring that the heat required by the energy storage device and the environmental heat absorbed by the outdoor heat exchanger can quickly reach a matching state, thereby ensuring the energy storage effect while further reducing the energy consumption of the outdoor fan. When the pressure characteristic is greater than or equal to the third preset pressure characteristic, it indicates that the heat pump system has a reliability operation risk. At this time, the outdoor fan is directly controlled to operate at the lowest speed to maximize the reduction of ambient heat absorbed by the outdoor heat exchanger, so that the system condensing pressure is quickly reduced, thereby improving the operation reliability of the heat pump system.

[0109] Furthermore, in this embodiment, after the step of controlling the outdoor fan to reduce the speed to the minimum speed, it also includes: controlling the outdoor fan to maintain the minimum speed until the current pressure characteristic of the heat pump system is less than or equal to a fourth preset pressure characteristic, returning to execute the step of controlling the heat pump system to operate in a preset mode, and obtaining the pressure characteristic of the heat pump system; the fourth preset pressure characteristic is less than the second preset pressure characteristic.

[0110] The fourth preset pressure characteristic is a pressure characteristic critical value used to distinguish whether the risk of reliability problems of the heat pump system is completely eliminated.

[0111] In this embodiment, the outdoor fan maintains the minimum speed until the pressure characteristic is reduced sufficiently to ensure that the risk of reliability problems is effectively eliminated, and then the speed of the outdoor fan is re-adapted to the pressure characteristic to adjust and control, thereby further reducing the energy consumption of the outdoor fan while improving the operating reliability of the heat pump system.

[0112] In other embodiments, the outdoor fan may be controlled to maintain the lowest speed for a preset period of time and then return to step S10.

[0113] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. Figure 5 , after step S10, further comprising:

[0114] Step S30, when the pressure characteristic is less than or equal to the target pressure characteristic of the heat pump system, controlling the outdoor fan to increase the operating speed;

[0115] The target pressure characteristic is the minimum pressure characteristic allowed when the heat pump system meets the heat storage demand of the energy storage device.

[0116] In this embodiment, the target pressure characteristic can be specifically determined according to the temperature of the energy storage device. Different energy storage temperatures correspond to different target pressure characteristics. In this embodiment, the energy storage temperature is positively correlated with the target pressure characteristic. A corresponding relationship between the energy storage temperature and the target pressure characteristic is established in advance, and the corresponding relationship may include a quantitative relationship, a mapping relationship, etc. Based on the corresponding relationship, the target pressure characteristic corresponding to the current energy storage temperature can be determined.

[0117] In the process of increasing the operating speed of the outdoor fan: the outdoor fan speed is increased according to a preset fixed speed adjustment value, or the outdoor fan speed is increased according to a speed adjustment value determined according to actual operating state parameters of the heat pump system (for example, the difference between the first preset pressure characteristic and the pressure characteristic), or the outdoor fan speed is increased according to a preset fixed speed, or the outdoor fan is controlled to increase to a preset target speed, etc.

[0118] Step S40, when the pressure characteristic is greater than the target pressure characteristic, and the pressure characteristic is less than or equal to the first preset pressure characteristic, control the outdoor fan to maintain the current speed; wherein the target pressure characteristic is less than the first preset pressure characteristic.

[0119] The target pressure characteristic may be increased according to a preset value to obtain a first preset pressure characteristic.

[0120] In this embodiment, when the pressure characteristic is less than or equal to the target pressure characteristic of the heat pump system, it indicates that the heat pump system fails to meet the heat storage demand of the energy storage device. At this time, the speed of the outdoor fan is promptly increased to increase the heat absorbed by the outdoor heat exchanger from the outdoor heat exchanger, thereby ensuring that there is sufficient heat to meet the heat storage demand of the energy storage device. When the pressure characteristic is greater than the target pressure characteristic but less than or equal to the first preset pressure characteristic, the outdoor fan is in a relatively energy-saving state while meeting the heat storage demand of the energy storage device. At this time, the outdoor fan maintains the current speed, which is conducive to improving the operating stability of the outdoor fan.

[0121] Furthermore, in this embodiment, after step S20, the following steps are further included:

[0122] When the current speed of the outdoor fan is greater than the preset speed, returning to the step of controlling the heat pump system to operate in the preset mode at intervals of a first time length to obtain a pressure characteristic representing the system pressure of the heat pump system;

[0123] When the current speed of the outdoor fan is less than or equal to the preset speed, the step of returning to the step of controlling the preset operation mode of the heat pump system and obtaining the pressure characteristics of the heat pump system characterizing the system pressure is performed at an interval of a second time length; wherein the first time length is greater than the second time length.

[0124] The minimum speed of the outdoor fan can be reduced to 0. In this embodiment, the preset speed is 0. In other embodiments, the preset speed may also be other values ​​greater than 0.

[0125] The first duration and the second duration may be preset fixed durations, for example, the first duration is 40 seconds and the second duration is 20 seconds. In addition, the first duration and the second duration may be determined according to actual operating parameters of the heat pump system, for example, the first duration and the second duration may be determined according to the operating frequency of the compressor and / or the energy storage temperature of the energy storage device.

[0126] In this embodiment, when the speed of the outdoor fan is very low or even stopped, the outdoor fan is re-regulated based on the pressure characteristics at short intervals; when the speed of the outdoor fan is relatively high, the outdoor fan is re-regulated based on the pressure characteristics at long intervals. Based on this, it is helpful to avoid the outdoor fan running at a low speed for a long time or shutting down to affect the heat storage efficiency of the energy storage device, thereby effectively improving the heat storage effect of the energy storage device.

[0127] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, referring to Figure 6 , the control method of the heat pump system further includes:

[0128] Step S01, controlling the heat pump system to start the preset mode, and obtaining the outdoor ambient temperature and the frequency characteristic value of the compressor;

[0129] In this embodiment, the frequency characteristic value includes the ratio of the target frequency of the compressor to the maximum frequency of the compressor, the target frequency can be determined according to the temperature difference between the energy storage device and the set energy storage temperature, and the maximum frequency can be determined according to the outdoor ambient temperature.

[0130] In other embodiments, the frequency characteristic value may also include the actual operating frequency of the compressor.

[0131] Step S02, determining the initial rotation speed of the outdoor fan according to the outdoor ambient temperature and the frequency characteristic value;

[0132] Different outdoor ambient temperatures and different frequency characteristic values ​​correspond to different initial speeds. Among them, the corresponding relationship between the outdoor ambient temperature, the frequency characteristic value and the initial speed can be preset, and the corresponding relationship may include a calculation formula, a mapping relationship, etc. Based on the corresponding relationship, the initial speed corresponding to the current outdoor ambient temperature and the frequency characteristic value speed can be determined.

[0133] In this embodiment, when the outdoor ambient temperature is less than or equal to the preset ambient temperature (e.g., 20°C in the table below), the maximum speed is determined to be the initial speed; when the outdoor ambient temperature is greater than the preset ambient temperature, the initial speed is determined within a speed range less than the maximum speed based on the outdoor ambient temperature and the frequency characteristic value. The initial speed here can be determined based on the temperature interval of the outdoor ambient temperature and the numerical interval of the frequency characteristic value.

[0134] For example, the corresponding relationship between the outdoor ambient temperature T4, the frequency characteristic value n and the speed characteristic value X corresponding to the initial speed is shown in the following table:

[0135]

[0136] The above table can be used to determine the speed characteristic value X corresponding to the current outdoor ambient temperature and frequency characteristic value, and the initial speed of the outdoor fan can be calculated using the speed characteristic value X.

[0137] In other embodiments, the initial rotation speed of the outdoor fan may also be calculated by using the outdoor ambient temperature and the frequency characteristic value.

[0138] Step S03, controlling the outdoor fan to run at the initial speed until a first preset condition is met, and executing the step of obtaining the pressure characteristic representing the system pressure of the heat pump system.

[0139] The first preset condition is specifically a condition that the heat storage amount of the preset energy storage device is greater than or equal to the preset heat amount and the heat pump system operating parameters need to meet when the preset heat amount does not reach the target heat amount.

[0140] In this embodiment, the first preset condition includes one of the following conditions:

[0141] The activation duration of the preset mode is greater than or equal to the first preset duration;

[0142] The startup duration of the preset mode is greater than or equal to a second preset duration, and the current pressure characteristic of the heat pump system representing the current system pressure is greater than or equal to a fifth preset pressure characteristic, and the second preset duration is less than the first preset duration.

[0143] The fifth preset pressure characteristic is specifically smaller than the third preset pressure characteristic mentioned above.

[0144] The first preset time length and the second preset time length are preset fixed values. For example, the first preset time length is 2 minutes, and the second preset time length is 20 seconds.

[0145] In this embodiment, during the startup phase of the preset mode, the initial speed of the outdoor fan is controlled according to the outdoor ambient temperature and the frequency characteristic value of the compressor, which is conducive to ensuring that the system can provide sufficient heat to quickly increase the temperature of the energy storage device, so as to effectively improve the energy storage effect of the energy storage device. Among them, when the outdoor ambient temperature is low, the outdoor fan runs at the maximum speed, which is conducive to the outdoor heat exchanger to recover the outdoor ambient heat as much as possible for the energy storage device to store heat, thereby improving the heat storage efficiency; when the outdoor ambient temperature is high, the outdoor fan is adapted to the outdoor ambient temperature and the frequency characteristic value of the compressor to determine the initial speed, which is conducive to meeting the heat storage demand while reducing energy consumption.

[0146] Further, based on any of the above embodiments, another optional embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, the heat pump system includes more than one indoor unit, referring to Figure 7 , the control method of the heat pump system further includes:

[0147] Step S50, controlling the heat pump system to run in a preset mode, when the number of the indoor units turned on among the more than one indoor units changes, obtaining an initial speed of the outdoor fan and an energy demand parameter of the indoor unit that currently has energy demand for the energy storage device, wherein the initial speed is determined according to the outdoor ambient temperature and the frequency characteristic value of the compressor;

[0148] The specific process of determining the initial rotation speed here can be found in the above embodiment, and will not be described in detail here.

[0149] When the number of opened indoor units increases or decreases in more than one indoor unit, the initial rotation speed and energy demand parameters can be obtained here.

[0150] The initial speed is determined based on the current outdoor ambient temperature and the current compressor frequency characteristic value.

[0151] The indoor unit that has energy demand for the energy storage device refers to the indoor space regulated by the indoor unit that has a demand for the energy in the energy storage device. In order to adapt to the actual needs of the user, there can be one or more indoor units that have energy demand for the energy storage device at the same time.

[0152] The energy demand parameter is specifically a state parameter that characterizes the demand size of the energy storage device for the compressor output capacity in a preset mode when the indoor unit has a capacity demand for the energy storage device. The energy demand parameter can be determined based on the detection data inside the energy storage device and / or the detection data of the environment where the heat pump system is located and / or the number of indoor units that have energy demand for the energy storage device and / or the compressor operating parameters.

[0153] Step S60, when the energy demand parameter and the initial speed meet a second preset condition, controlling the outdoor fan to run at the initial speed; the second preset condition includes that the increase amplitude of the energy demand parameter is greater than or equal to a preset amplitude, and the initial speed is greater than or equal to the current speed of the outdoor fan;

[0154] Step S70, when the energy demand parameter and the initial speed do not meet the second preset condition, execute the step of obtaining the pressure characteristics of the heat pump system characterizing the system pressure; the second preset condition includes that the amplitude of the increase of the energy demand parameter is greater than or equal to the preset amplitude, and the initial speed is greater than or equal to the current speed of the outdoor fan.

[0155] The second preset condition includes that the increase amplitude of the energy demand parameter is greater than or equal to a preset amplitude, and the initial rotation speed is greater than or equal to the current rotation speed of the outdoor fan.

[0156] It should be noted that during the execution of step S10 and step S20, before step S10 or after step S20, it can be detected in real time whether the number of turned-on indoor units changes. When changes occur, the control method of the outdoor fan is determined based on the initial speed and energy demand parameters.

[0157] In this embodiment, when the number of indoor units turned on changes, the energy demand increases significantly, and the initial speed is greater than the current speed of the outdoor fan, a larger initial speed is used to control the operation of the outdoor fan to ensure that the energy of the energy storage device can accurately meet the use needs of the newly added indoor units. When the number of indoor units turned on changes, the energy demand increases slightly, the energy demand decreases, or the initial speed is less than the current speed of the outdoor fan, the speed of the outdoor fan is determined according to the pressure characteristics in the manner mentioned in the above embodiment, which is conducive to meeting the indoor demand for the use of the energy storage device while reducing energy consumption.

[0158] Furthermore, in this embodiment, the step of obtaining energy demand parameters includes: obtaining the total energy demand value of all the indoor units that currently have energy demand for the energy storage device and the capacity of the outdoor unit; and determining the energy demand parameters according to the ratio of the total energy demand value to the capacity.

[0159] In this embodiment, the capacity here is the rated capacity. In other embodiments, the capacity here can also be determined according to the operating frequency of the u outdoor unit.

[0160] Obtaining an actual energy requirement value of the energy storage device under current working conditions and a rated energy requirement value of the energy storage device; and determining the total energy requirement value according to the actual energy requirement value and the rated energy requirement value.

[0161] The actual energy demand value is related to the actual operating conditions of the energy storage device and can change with the actual operating conditions. The rated energy demand value is related to the inherent properties of the energy storage device and does not change with the actual operating conditions.

[0162] In this embodiment, the sum of the actual energy demand value and the rated energy demand value is determined as the total energy demand value. In other embodiments, the rated energy demand value can also be used to determine the correction coefficient, and the actual energy demand value is corrected according to the correction coefficient to obtain the total energy demand value.

[0163] The process of obtaining the actual energy requirement value is as follows: obtaining the energy storage temperature of the energy storage device and the outdoor ambient temperature corresponding to the heat pump system; and determining the actual energy requirement value according to the energy storage temperature and the outdoor ambient temperature.

[0164] The energy storage temperature is detected by the above-mentioned temperature sensor. The outdoor environment temperature is detected by the above-mentioned environment detection module.

[0165] Different energy storage temperatures and different outdoor ambient temperatures correspond to different actual energy demand values. The actual energy demand value is negatively correlated with the outdoor ambient temperature, and the actual energy demand value is negatively correlated with the energy storage temperature.

[0166] Specifically, a correspondence between the energy storage temperature, the outdoor ambient temperature and the actual energy requirement value can be established in advance. The correspondence may include a calculation formula, a mapping relationship, etc. Based on the correspondence, the actual energy requirement value corresponding to the current energy storage temperature and the outdoor ambient temperature can be determined.

[0167] Furthermore, more than one correspondence relationship between the energy storage temperature, the outdoor ambient temperature and the actual energy demand value can be pre-set, and the target correspondence relationship can be determined in more than one correspondence relationship based on the operating speed of the outdoor fan corresponding to the outdoor heat exchanger and the temperature difference between the energy storage temperature and the target temperature, and the actual energy demand value corresponding to the current energy storage temperature and the outdoor ambient temperature is determined based on the target correspondence relationship.

[0168] Here, the operating conditions of the preset mode can be accurately reflected by combining the outdoor ambient temperature and the energy storage temperature. Therefore, the actual energy demand value is determined according to the outdoor ambient temperature and the energy storage temperature, which is beneficial to ensure that the actual energy demand value can accurately reflect the actual energy demand of the energy storage device under the current operating conditions, thereby facilitating further improving the accuracy of the compressor frequency operation control and improving the energy storage efficiency of the energy storage device.

[0169] In other implementations, the actual energy requirement value may also be determined based on one of the outdoor ambient temperature and the energy storage temperature, or based on other parameters other than the outdoor ambient temperature and the energy storage temperature. The other parameters here may be, for example, the temperature difference between the energy storage temperature and the set temperature of the energy storage device and / or the temperature change rate of the outdoor heat exchanger and / or the temperature difference between the inner surface temperature and the outer surface temperature of the energy storage device and / or the temperature difference change rate between the inner surface temperature and the outer surface temperature of the energy storage device, and / or the temperature difference change rate between the inner surface temperature and the outer surface temperature of the energy storage device, and the like.

[0170] In other implementations, one of the actual energy demand value and the rated energy demand value may be used as the total energy demand value.

[0171] In this embodiment, the energy demand parameter is determined according to the ratio of the total energy demand value to the capacity, which is conducive to accurately reflecting the degree of matching of the output capacity of the compressor with the demand when the indoor unit has a capacity demand for the energy storage device. Therefore, the outdoor fan is regulated based on the energy demand parameter determined in this way in combination with the initial speed, which is conducive to further meeting the indoor demand for the use of the energy storage device while reducing the energy consumption of the outdoor fan and improving the operating stability of the heat pump system.

[0172] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program of a heat pump system is stored. When the control program of the heat pump system is executed by a processor, the relevant steps of any embodiment of the control method of the heat pump system are implemented.

[0173] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0174] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0175] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, including a number of instructions for a terminal device (which can be a mobile phone, computer, server, heat pump system, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0176] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a heat pump system, characterized in that: The heat pump system comprises a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprises an indoor unit, an outdoor unit and compressors respectively connected to the indoor unit and the outdoor unit, the refrigerant branch circuit comprises an energy storage device, and the control method of the heat pump system comprises the following steps: Controlling the heat pump system to run in a preset mode, obtaining a pressure characteristic of the heat pump system that characterizes the system pressure; in the preset mode, the energy storage device is in a heat storage state, and the outdoor heat exchanger in the outdoor unit is in an evaporation state; When the pressure characteristic is greater than the first preset pressure characteristic, the outdoor fan corresponding to the outdoor heat exchanger is controlled to reduce the operating speed.

2. The control method of the heat pump system according to claim 1, characterized in that: When the pressure characteristic is greater than the first preset pressure characteristic, the step of controlling the outdoor fan corresponding to the outdoor heat exchanger to reduce the operating speed includes: When the pressure characteristic is greater than a first preset pressure characteristic, and the pressure characteristic is less than a second preset pressure characteristic, determining a first speed adjustment value according to a pressure difference between the first preset pressure characteristic and the pressure characteristic, and controlling the outdoor fan to reduce the operating speed according to the first speed adjustment value; When the pressure characteristic is greater than or equal to the second preset pressure characteristic, and the pressure characteristic is less than the third preset pressure characteristic, controlling the outdoor fan to reduce the operating speed according to a preset rate; When the pressure characteristic is greater than or equal to the third preset pressure characteristic, controlling the outdoor fan to reduce the speed to the lowest speed; The first preset pressure characteristic is smaller than the second preset pressure characteristic, and the second preset pressure characteristic is smaller than the third preset pressure characteristic.

3. The control method of the heat pump system according to claim 2, characterized in that: After the step of controlling the outdoor fan to reduce the speed to the lowest, the method further includes: Controlling the outdoor fan to maintain the minimum speed until the current pressure characteristic of the heat pump system characterizing the current system pressure is less than or equal to a fourth preset pressure characteristic, returning to the step of controlling the heat pump system to operate in a preset mode, and obtaining the pressure characteristic characterizing the system pressure of the heat pump system; Wherein, the fourth preset pressure characteristic is smaller than the second preset pressure characteristic.

4. The control method of the heat pump system according to claim 1, characterized in that: After the step of obtaining the pressure characteristics of the heat pump system, the method further includes: When the pressure characteristic is less than or equal to the target pressure characteristic of the heat pump system, controlling the outdoor fan to increase the operating speed; When the pressure characteristic is greater than the target pressure characteristic, and the pressure characteristic is less than or equal to the first preset pressure characteristic, controlling the outdoor fan to maintain the current speed; Wherein, the target pressure characteristic is smaller than the first preset pressure characteristic.

5. The control method of the heat pump system according to claim 1, characterized in that: After the step of controlling the outdoor fan corresponding to the outdoor heat exchanger to reduce the operating speed when the pressure characteristic is greater than the first preset pressure characteristic, the method further includes: When the current speed of the outdoor fan is greater than the preset speed, returning to the step of controlling the heat pump system to operate in the preset mode at intervals of a first time length to obtain a pressure characteristic representing the system pressure of the heat pump system; When the current speed of the outdoor fan is less than or equal to the preset speed, returning to the step of controlling the heat pump system to operate in the preset mode and obtaining a pressure characteristic representing the system pressure of the heat pump system at an interval of a second time length; The first duration is greater than the second duration.

6. The control method of the heat pump system according to claim 1, characterized in that: The control method of the heat pump system further includes: Controlling the heat pump system to start the preset mode, and obtaining the outdoor ambient temperature and the frequency characteristic value of the compressor; Determining an initial rotation speed of the outdoor fan according to the outdoor ambient temperature and the frequency characteristic value; When the outdoor fan is controlled to run at the initial speed until a first preset condition is met, the step of controlling the heat pump system to run in a preset mode and obtaining a pressure characteristic representing the system pressure of the heat pump system is executed.

7. The control method of the heat pump system according to claim 6, characterized in that: The frequency characteristic value includes a ratio of a target frequency of the compressor to a maximum frequency of the compressor; and / or, The first preset condition includes one of the following conditions: The activation duration of the preset mode is greater than or equal to the first preset duration; The startup duration of the preset mode is greater than or equal to a second preset duration, and the current pressure characteristic of the heat pump system representing the current system pressure is greater than or equal to a fifth preset pressure characteristic, and the second preset duration is less than the first preset duration.

8. The control method of the heat pump system according to claim 6, characterized in that: The step of determining the initial rotation speed of the outdoor fan according to the outdoor ambient temperature and the frequency characteristic value comprises: When the outdoor ambient temperature is less than or equal to the preset ambient temperature, determining the maximum rotation speed to be the initial rotation speed; When the outdoor ambient temperature is greater than the preset ambient temperature, the initial rotational speed is determined within a rotational speed range less than the maximum rotational speed according to the outdoor ambient temperature and the frequency characteristic value.

9. The control method of the heat pump system according to claim 1, characterized in that: The heat pump system includes more than one indoor unit, and the control method of the heat pump system further includes: Controlling the heat pump system to operate in a preset mode, when the number of the turned-on indoor units among the more than one indoor units changes, obtaining an initial speed of the outdoor fan and an energy demand parameter of the indoor unit that currently has energy demand for the energy storage device, wherein the initial speed is determined according to the outdoor ambient temperature and the frequency characteristic value of the compressor; When the energy demand parameter and the initial speed meet a second preset condition, controlling the outdoor fan to run at the initial speed; When the energy demand parameter and the initial rotation speed do not satisfy the second preset condition, performing the step of obtaining the pressure characteristic representing the system pressure of the heat pump system; The second preset condition includes that the increase amplitude of the energy demand parameter is greater than or equal to a preset amplitude, and the initial rotation speed is greater than or equal to the current rotation speed of the outdoor fan.

10. The control method of the heat pump system according to claim 9, characterized in that: The steps to obtain the required parameters include: Obtaining the total energy demand value of all the indoor units that currently have energy demand for the energy storage device and the capacity of the outdoor unit; The energy demand parameter is determined according to a ratio of the total energy demand value to the capacity.

11. A heat pump system, characterized in that: The heat pump system comprises a control device, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprises an indoor unit, an outdoor unit and a compressor respectively connected to the indoor unit and the outdoor unit, and the refrigerant branch circuit comprises an energy storage device; The compressor and the outdoor fan in the outdoor unit are connected to the control device, which includes: a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor, wherein the control program of the heat pump system implements the steps of the control method of the heat pump system as described in any one of claims 1 to 10 when executed by the processor.

12. A storage medium, characterized in that: The storage medium stores a control program of the heat pump system, and when the control program of the heat pump system is executed by the processor, the steps of the control method of the heat pump system according to any one of claims 1 to 10 are implemented.

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