Heat pump system and control method thereof, air conditioner and storage medium

Abstract

The invention discloses a heat pump system, a control method of the heat pump system, an air conditioner and a storage medium. The heat pump system comprises a refrigerant loop, the refrigerant loop comprises a compressor, at least two first heat exchangers and a refrigerant adjusting assembly, and the compressor is provided with an air return port and an air suction port close to the air return port; the at least two first heat exchangers, the air return port and the air suction port are all connected with the refrigerant adjusting assembly, the refrigerant adjusting assembly is used for switching the connecting state of each first heat exchanger between a first state and a second state, the first state comprises that the first heat exchangers are connected with the air return port, and the second state comprises that the first heat exchangers are connected with the air suction port. And the second state comprises that the first heat exchanger is connected with the air suction port. The heat pump system can meet different load requirements, and meanwhile the energy efficiency of the system is improved.

Description

Technical Field

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

[0002] Some heat pump systems are equipped with at least two indoor heat exchangers to regulate the environment of the indoor space. The indoor load varies, and different temperature requirements are placed on different indoor heat exchangers.

[0003] However, when the indoor heat exchanger is in the evaporating state, all evaporators are connected to the return air port of the compressor and have the same evaporation pressure. Currently, the load is adjusted by adjusting the flow rate through the opening of the electronic expansion valve, and differentiated adjustment of different indoor heat exchangers cannot be achieved, which easily leads to low system energy efficiency. Summary of the invention

[0004] The main purpose of the present invention is to provide a heat pump system, a control method for the heat pump system, an air conditioner and a storage medium, aiming to enable the heat pump system to meet different load requirements while improving the system energy efficiency.

[0005] To achieve the above object, the present invention provides a heat pump system, the heat pump system includes a refrigerant circuit, the refrigerant circuit includes a compressor, at least two first heat exchangers and a refrigerant regulating component, the compressor is provided with an air return port and an air intake port provided near the air return port;

[0006] The at least two first heat exchangers, the return air port and the intake air port are all connected to the refrigerant regulating component, and the refrigerant regulating component is used to switch the connection state of each first heat exchanger between a first state and a second state, the first state includes the first heat exchanger being connected to the return air port, and the second state includes the first heat exchanger being connected to the intake air port.

[0007] Optionally, the refrigerant regulating component includes at least two refrigerant components, and the refrigerant components are arranged in a one-to-one correspondence with the first heat exchangers, and each of the first heat exchangers is connected to the return air port and the intake air port through the corresponding refrigerant component.

[0008] Optionally, the heat pump system further includes a second heat exchanger, the compressor further includes an exhaust port, and the refrigerant regulating component includes:

[0009] A reversing assembly, wherein the exhaust port, the return air port and the second heat exchanger are all in communication with the reversing assembly;

[0010] At least two refrigerant components are provided in one-to-one correspondence with the first heat exchanger, each first heat exchanger is connected to the corresponding refrigerant component, and the reversing assembly and the air intake port are respectively connected to each refrigerant component.

[0011] Optionally, the refrigerant component includes a three-way valve.

[0012] Optionally, an evaporation pressure of the first heat exchanger corresponding to the first state is smaller than an evaporation pressure of the first heat exchanger corresponding to the second state.

[0013] Optionally, the ratio of the pressure at the air intake port to the pressure at the air return port is not less than 10% and not more than 50%;

[0014] Optionally, the ratio of the compression stroke corresponding to the air intake port to the compression stroke corresponding to the air return port is not less than 10% and not more than 50%.

[0015] Optionally, a one-way valve is provided on the air intake port or on a pipeline between the refrigerant regulating component and the air intake port, and the one-way valve is configured to conduct one-way flow from the refrigerant regulating component to the air intake port.

[0016] Optionally, the frequency range of the compressor is not less than 8 Hz and not more than 160 Hz.

[0017] In addition, in order to achieve the above object, the present invention further proposes a control method for a heat pump system. Based on the heat pump system as described in any one of the above items, the control method for the heat pump system further includes:

[0018] Obtaining a first indoor temperature of each indoor space regulated by the first heat exchanger having a heat exchange demand;

[0019] The operation of the refrigerant regulating component is controlled according to each of the first indoor temperatures and the corresponding set temperature.

[0020] Optionally, the step of controlling the operation of the refrigerant regulating component according to each of the first indoor temperatures and the corresponding set temperature includes:

[0021] Determine a first temperature difference between each of the first indoor temperatures and the corresponding set temperature;

[0022] When the first temperature difference satisfies a first condition, controlling the refrigerant regulating component to operate so that the corresponding first heat exchanger is connected to the return air port;

[0023] When the first temperature difference satisfies a second condition, controlling the refrigerant regulating component to operate so that the corresponding first heat exchanger is connected to the air intake port;

[0024] The first condition includes that the first temperature difference is greater than a first threshold value, the second condition includes that the first temperature difference is less than a second threshold value or the first temperature difference is less than the second threshold value and lasts for a first time period, and the second threshold value is less than or equal to the first threshold value.

[0025] Optionally, after the step of controlling the operation of the refrigerant conditioning component according to each of the first indoor temperatures and the corresponding set temperature, the method further includes:

[0026] Acquire a second indoor temperature corresponding to the first heat exchanger currently connected to the air intake port;

[0027] Determine a second temperature difference between the second indoor temperature and the corresponding set temperature;

[0028] When the second temperature difference satisfies a third condition, controlling the refrigerant regulating component to operate so that the corresponding first heat exchanger is connected to the return air port;

[0029] The third condition includes that the second temperature difference value is greater than a third threshold value or the second temperature difference value is greater than the third threshold value and lasts for a second time period, and the third threshold value is greater than the second threshold value and not greater than the first threshold value.

[0030] Optionally, the refrigerant regulating component includes at least two refrigerant components, the refrigerant components are arranged in a one-to-one correspondence with the first heat exchanger, the refrigerant components have a first operating state and a second operating state, the first valve port of the refrigerant component is arranged corresponding to the return air port, the second valve port of the refrigerant component is arranged corresponding to the intake air port, the first operating state includes the first valve port being open and the second valve port being closed, the second operating state includes the first valve port being closed and the second valve port being open, and the control method of the heat pump system further includes:

[0031] When the refrigerant component switches between the first operating state and the second operating state, determining that the valve port to be opened among the first valve port and the second valve port is a first target valve port and the valve port to be closed is a second target valve port;

[0032] Controlling the first target valve port to open at an initial opening and increase the opening to a maximum opening for operation;

[0033] When the first target valve port is opened to the maximum opening, controlling the second target valve port to be closed;

[0034] The flow cross-sectional area corresponding to the initial opening is not less than 50% of the outlet area corresponding to the maximum opening.

[0035] Optionally, after the step of determining a first temperature difference between each first indoor temperature and the corresponding set temperature, the method further comprises:

[0036] When all of the first temperature difference values ​​satisfy the second condition, the refrigerant regulating component is controlled to operate so that at least one of the first heat exchangers is connected to the return air port.

[0037] Optionally, the interval duration for switching the refrigerant regulating component between different operating states is greater than a preset duration.

[0038] In addition, in order to achieve the above-mentioned purpose, the present application also proposes an air conditioner, the air conditioner comprising:

[0039] A heat pump system as described in any one of the above items;

[0040] A control device, the heat pump system is connected to the control device, and the control device comprises:

[0041] A memory, a processor, and a control program for a heat pump system stored in the memory and executable on the processor, wherein the control program for the heat pump system, when executed by the processor, implements the steps of the control method for the heat pump system as described in any one of the above items.

[0042] 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.

[0043] The present invention proposes a heat pump system, in which the compressor is provided with an air intake port near the return air port in addition to the return air port and the exhaust port, at least two first heat exchangers, the air intake port and the return air port are all connected to the refrigerant regulating component, and the first heat exchanger can adapt to the actual load and be connected to the return air port and the air intake port under the regulation of the refrigerant regulating component. When the first heat exchanger is in an evaporating state, the return air port and the air intake port have different corresponding evaporation pressures, thereby realizing that the evaporation temperature of the first heat exchanger adapts to the load change to accurately meet different load requirements, and different first heat exchangers can realize differentiated regulation, thereby effectively improving the energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the system structure of an embodiment of a heat pump system of the present invention;

[0045] Figure 2 A schematic diagram of the system structure of another embodiment of the heat pump system of the present invention;

[0046] Figure 3 A schematic diagram of the hardware structure involved in the operation of an embodiment of a control method for a heat pump system of the present invention;

[0047] Figure 4 It is a flow chart of an embodiment of a control method of a heat pump system of the present invention.

[0048] 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

[0049] 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.

[0050] The embodiment of the present invention provides a heat pump system. In this embodiment, the heat pump system is a system in a multi-split air conditioner. In other embodiments, the heat pump system may also be a system in other electrical appliances, such as a three-pipe air conditioner, a constant temperature dehumidification air conditioner, a refrigerator, or a water heater.

[0051] In the embodiment of the present invention, refer to Figure 1 The heat pump system includes a refrigerant circuit, which includes a compressor 1, at least two first heat exchangers 2, a throttling device 3, a second heat exchanger 4 and a refrigerant regulating component 5. The compressor 1 is provided with a return air port 01 and an air intake port 02 arranged near the return air port 01.

[0052] The at least two first heat exchangers 2, the return air port 01 and the air intake port 02 are all connected to the refrigerant regulating component 5, and the refrigerant regulating component 5 is used to switch the connection state of each first heat exchanger 2 between a first state and a second state, the first state includes the first heat exchanger 2 being connected to the return air port 01, and the second state includes the first heat exchanger 2 being connected to the air intake port 02.

[0053] At least two first heat exchangers 2 , a throttling device 3 , and a second heat exchanger 4 are arranged in sequence, and the throttling device 3 can throttle and reduce the pressure of the refrigerant flowing between the first heat exchanger 2 and the second heat exchanger 4 .

[0054] In this embodiment, the first heat exchanger 2 is an indoor heat exchanger, and the second heat exchanger 4 is an outdoor heat exchanger. In other embodiments, both the first heat exchanger 2 and the second heat exchanger 4 can be arranged indoors. Different first heat exchangers 2 are arranged in different indoor spaces, and different indoor spaces are spaces separated from each other. In other embodiments, different first heat exchangers 2 can also be arranged corresponding to different areas of the indoor space, or at least two first heat exchangers 2 are arranged in sequence along the air outlet direction.

[0055] The compressor 1 is any form such as a rotary compressor, a scroll compressor, a screw compressor, etc. The compressor 1 can also be any form such as a single-stage compressor, a two-stage compressor or an injection enthalpy compressor, etc.

[0056] The return air port 01 of the compressor 1 and the air intake port 02 of the compressor 1 correspond to different compression strokes, respectively, and the return air pressure of the return air port 01 is different from the air intake pressure of the air intake port 02. In the present embodiment, the compressor 1 includes a first compression chamber and a second compression chamber that are isolated from each other, and the high-pressure side of the first compression chamber and the high-pressure side of the second compression chamber are both connected to the exhaust port 03 of the compressor 1, the low-pressure side of the first compression chamber is connected to the return air port 01, and the low-pressure side of the second compression chamber is connected to the air intake port 02. In other embodiments, the return air port 01 of the compressor 1 and the air intake port 02 of the compressor 1 can be connected to different positions of the same compression chamber, respectively.

[0057] When the heat pump system is running, the refrigerant discharged from the compressor 1 flows through the second heat exchanger 4, the throttling device 3, and at least two first heat exchangers 2 in sequence, and then flows back to the compressor 1 from the return air port 01 or the intake air port 02 under the regulation of the refrigerant regulating component 5. The first heat exchanger 2 is in an evaporating state, and the second heat exchanger 4 is in a condensing state.

[0058] The refrigerant regulating component 5 may be an integrated component, or may include more than one refrigerant regulating component. The refrigerant regulating component 5 may switch the connection state of each first heat exchanger 2 between the first state and the second state by switching the operation state. The refrigerant regulating component 5 may independently adjust the connection states of different first heat exchangers 2. Under the action of the regulating group of the refrigerant regulating component 5, all first heat exchangers 2 may be in the first state, may be in the second state, or may be partially in the first state and partially in the second state.

[0059] Under the regulation of the refrigerant regulating component 5, at least two first heat exchangers 2 can have different combinations of connection states, so that different first heat exchangers 2 in at least two first heat exchangers 2 can have different combinations of evaporation temperatures to meet different load requirements. For example, at least two first heat exchangers 2 include heat exchanger A and heat exchanger B, and the pressure of the return air port 01 is lower than the pressure of the intake air port 02. Then, under the regulation of the refrigerant regulating component 5, the heat exchanger A and the heat exchanger B can have the following matching states:

[0060] Coordination state 1: heat exchanger A is connected to the return air port 01, and heat exchanger B is connected to the return air port 01. The evaporation temperatures of heat exchanger A and heat exchanger B are both low to meet the high load requirements of the indoor spaces regulated by heat exchanger A and heat exchanger B respectively.

[0061] Coordination state 2: heat exchanger A is connected to the return air port 01, and heat exchanger B is connected to the air intake port 02. The evaporation temperature of heat exchanger A is lower and the evaporation temperature of heat exchanger B is higher, so as to meet the high load demand of the indoor space regulated by heat exchanger A and the low load demand of the indoor space regulated by heat exchanger B.

[0062] Coordination state 3: heat exchanger A is connected to the air intake port 02, and heat exchanger B is connected to the air return port 01. The evaporation temperature of heat exchanger A is higher and the evaporation temperature of heat exchanger B is lower, so as to meet the low load demand of the indoor space regulated by heat exchanger A and the high load demand of the indoor space regulated by heat exchanger B.

[0063] Coordination state 4: heat exchanger A is connected to the air intake port 02, and heat exchanger B is connected to the air intake port 02. The evaporation temperatures of heat exchanger A and heat exchanger B are both high to meet the low load requirements of the indoor spaces regulated by heat exchanger A and heat exchanger B respectively.

[0064] An embodiment of the present invention proposes a heat pump system, in which the compressor 1 is provided with an air intake port 02 near the return air port 01 in addition to the return air port 01 and the exhaust port 03, and at least two first heat exchangers 2, the air intake port 02 and the return air port 01 are all connected to the refrigerant regulating component 5. The first heat exchanger 2 can be connected to the return air port 01 and the air intake port 02 to adapt to the actual load under the regulation of the refrigerant regulating component 5. When the first heat exchanger 2 is in an evaporating state, the return air port 01 and the air intake port 02 have different corresponding evaporation pressures, so that the evaporation temperature of the first heat exchanger 2 can adapt to the load change to accurately meet different load requirements. Different first heat exchangers 2 can achieve differentiated regulation, thereby effectively improving the system energy efficiency.

[0065] Furthermore, in one embodiment, the frequency range of the compressor 1 is not less than 8 Hz and not more than 160 Hz.

[0066] In this embodiment, compressor 1 is a small-displacement compressor, the displacement of the small-displacement compressor is 70% to 75% of the large-displacement compressor, and the minimum frequency of the small-displacement compressor is less than or equal to 50% of the minimum frequency of the large-displacement compressor. Among them, the value range of the minimum frequency of the large-displacement compressor is [16Hz, 24Hz], and the value range of the minimum frequency of the small-displacement compressor is [8Hz, 15Hz]. In this embodiment, the displacement corresponding to the large-displacement compressor is greater than or equal to the standard displacement corresponding to the preset cooling capacity of the heat pump system. Based on this, the frequency range of compressor 1 can vary between 8Hz and 160Hz, and the frequency variation range of compressor 1 is relatively large, which is conducive to further improving the system energy efficiency at high and low loads.

[0067] Furthermore, in one embodiment, the refrigerant regulating assembly 5 includes at least two refrigerant components 51 , and the refrigerant components 51 are arranged in one-to-one correspondence with the first heat exchangers 2 , and each of the first heat exchangers 2 is connected to the return air port 01 and the intake air port 02 through the corresponding refrigerant component 51 .

[0068] Each refrigerant component 51 can switch the connection state of the corresponding first heat exchanger 2 between a first state and a second state.

[0069] In this embodiment, the exhaust port 03 of the compressor 1, the second heat exchanger 4, the throttling device 3 and at least two first heat exchangers 2 are connected in sequence.

[0070] Each refrigerant component 51 has a first operating state and a second operating state. When the refrigerant component 51 operates in the first operating state, the first heat exchanger 2 is connected to the reversing component 52, and the first heat exchanger 2 is blocked from the air intake port 02. At this time, the corresponding first heat exchanger 2 is in the first state; when the refrigerant component 51 operates in the second operating state, the first heat exchanger 2 is connected to the air intake port 02, and the first heat exchanger 2 is blocked from the reversing component 52. At this time, the corresponding first heat exchanger 2 is in the second state.

[0071] In one implementation of this embodiment, the refrigerant component 51 includes a three-way valve. The three-way valve includes a first valve port, a second valve port, and a third valve port. Each first heat exchanger 2 is connected to the first valve port of the corresponding three-way valve, the second valve port of each three-way valve is connected to the return air port 01, and the third valve port of each three-way valve is connected to the intake port 02.

[0072] In another implementation of this embodiment, the refrigerant component 51 may also include one-way valves arranged at different positions. For example, each refrigerant component 51 includes a first one-way valve and a second one-way valve. Each first heat exchanger 2 is connected to the return air port 01 through the corresponding first branch and to the intake air port 02 through the corresponding second branch. The first one-way valve is arranged on the first branch, and the second one-way valve is arranged on the second branch.

[0073] In this embodiment, each first heat exchanger 2 is provided with a corresponding refrigerant component 51 to adjust its connection state, which is conducive to achieving accurate adjustment of the connection state of each first heat exchanger 2 to adapt to the actual load demand of the indoor space it regulates, and is conducive to further improving the energy efficiency of the system.

[0074] Furthermore, in one embodiment, the heat pump system also includes a second heat exchanger 4, the compressor 1 is also provided with an exhaust port 03, the refrigerant regulating component 5 includes a reversing component 52 and at least two refrigerant components 51, the exhaust port 03, the return air port 01 and the second heat exchanger 4 are all connected to the reversing component 52, the refrigerant component 51 is arranged in a one-to-one correspondence with the first heat exchanger 2, each first heat exchanger 2 is connected to the corresponding refrigerant component 51, and the reversing component 52 and the air intake port 02 are respectively connected to each of the refrigerant components.

[0075] In this embodiment, the reversing component 52 is a four-way valve. The four-way valve has a first interface, a second interface, a third interface and a fourth interface, and the exhaust port 03, the return port 01, the second heat exchanger 4 and all the refrigerant components 51 are connected to the first interface, the second interface, the third interface and the fourth interface respectively. In other embodiments, the reversing component 52 may also include a combination of more than one multi-way valve or solenoid valve with the same regulating effect.

[0076] In one implementation of this embodiment, the refrigerant component 51 includes a three-way valve. The three-way valve includes a first valve port, a second valve port, and a third valve port. Each first heat exchanger 2 is connected to the first valve port of the corresponding three-way valve, the second valve port of each three-way valve is connected to the reversing component 52 (for example, the fourth interface of the four-way valve), and the third valve port of each three-way valve is connected to the air intake port 02.

[0077] In another implementation of this embodiment, the refrigerant component 51 may also include one-way valves arranged at different positions. For example, each refrigerant component 51 includes a first one-way valve and a second one-way valve. Each first heat exchanger 2 is connected to the reversing assembly 52 (for example, the fourth interface of the four-way valve) through the corresponding first branch and to the intake port 02 through the corresponding second branch. The first one-way valve is arranged on the first branch, and the second one-way valve is arranged on the second branch.

[0078] In this embodiment, the reversing component 52 has a third operating state and a fourth operating state. When the reversing component 52 operates in the third operating state, the exhaust port 03 is connected to the second heat exchanger 4, and the return air port 01 is connected to the refrigerant component 51; when the reversing component 52 operates in the fourth operating state, the exhaust port 03 is connected to the refrigerant component 51, and the return air port 01 is connected to the second heat exchanger 4.

[0079] Each refrigerant component 51 has a first operating state and a second operating state. When the refrigerant component 51 operates in the first operating state, the first heat exchanger 2 is connected to the reversing component 52, and the first heat exchanger 2 is blocked from the air inlet 02. When the refrigerant component 51 operates in the second operating state, the first heat exchanger 2 is connected to the air inlet 02, and the first heat exchanger 2 is blocked from the reversing component 52. The operating modes of the heat pump system through the cooperation of the reversing component 52 and at least two refrigerant valves include at least the following modes:

[0080] In the first mode, when the reversing assembly 52 operates in the third operating state and the refrigerant component 51 operates in the first operating state, the refrigerant discharged from the compressor 1 can flow through the second heat exchanger 4, the throttling device 3, and the first heat exchanger 2 corresponding to the refrigerant component 51 in sequence, and then flow into the return air port 01 of the compressor 1 under the regulation of the refrigerant component 51; when the refrigerant component 51 operates in the second operating state, the refrigerant discharged from the compressor 1 can flow through the second heat exchanger 4, the throttling device 3, and the first heat exchanger 2 corresponding to the refrigerant component 51 in sequence, and then flow into the suction port 02 of the compressor 1 under the regulation of the refrigerant component 51. In the first mode, the second heat exchanger 4 is in a condensing state and the first heat exchanger 2 is in an evaporating state.

[0081] In the second mode, when the reversing assembly 52 operates in the fourth operating state and the refrigerant component 51 operates in the first operating state, the refrigerant discharged from the compressor 1 can flow through the refrigerant component 51, the first heat exchanger 2, the throttling device 3, and the second heat exchanger 4 in sequence and then flow back to the return air port 01 of the compressor 1. In the first mode, the second heat exchanger 4 is in an evaporating state and the first heat exchanger 2 is in a condensing state.

[0082] In this embodiment, the heat pump system satisfies the heat exchange requirements of the first heat exchanger 2 for regulating different indoor spaces through the setting of the reversing component 52. At the same time, each first heat exchanger 2 is provided with a corresponding refrigerant component 51 to adjust its connection state, which is beneficial for the connection state of each first heat exchanger 2 to adapt to the actual load requirement of the indoor space it regulates during indoor cooling to achieve accurate adjustment, which is beneficial for meeting different heat exchange requirements and further improving the cooling efficiency of the system without affecting the heating efficiency.

[0083] Furthermore, in one embodiment, the evaporation pressure of the first heat exchanger 2 corresponding to the first state is lower than the evaporation pressure of the first heat exchanger 2 corresponding to the second state.

[0084] In one implementation of this embodiment, the ratio of the pressure of the air intake port 02 to the pressure of the air return port 01 is not less than 10% and not greater than 50%. The ratio here may be 10% or 20% or 30% or 40% or 50%, etc. In this embodiment, the pressure of the air return port 01 is the lowest pressure of the compressor 1. In other embodiments, the pressure of the air return port 01 and the pressure of the air intake port 02 may both be greater than the lowest pressure of the compressor 1.

[0085] In another implementation of this embodiment, the ratio between the compression stroke corresponding to the air intake port 02 and the compression stroke corresponding to the air return port 01 is not less than 10% and not more than 50%. The compression stroke corresponding to the air intake port 02 may be the compression distance from the air intake port 02 to the exhaust port 03, and the compression stroke corresponding to the air return port 01 may be the compression distance from the air return port 01 to the exhaust port 03. The ratio here may be 10% or 20% or 30% or 40% or 50%, etc. In this embodiment, the compression stroke of the air return port 01 is the maximum compression stroke of the compressor 1. In other embodiments, the compression stroke of the air return port 01 and the compression stroke of the air intake port 02 may both be less than the maximum compression stroke of the compressor 1.

[0086] Based on this, when the first heat exchanger 2 is connected to the return air port 01, the first heat exchanger 2 can reach a lower evaporation temperature to meet its high load demand for regulating the indoor space; when the second heat exchanger 4 is connected to the intake port 02, the first heat exchanger 2 can reach a higher evaporation temperature to meet its low load demand for regulating the indoor space.

[0087] Furthermore, in one embodiment, a one-way valve is provided on the air intake port 02 or on the pipeline between the refrigerant regulating component 5 and the air intake port 02 , and the one-way valve is provided to conduct one-way flow from the refrigerant regulating component 5 to the air intake port 02 .

[0088] In this embodiment, the one-way valve is provided to prevent the refrigerant in the compressor 1 from flowing back to the refrigerant regulating component 5, which is beneficial to improving the compression efficiency of the compressor 1 and further improving the energy efficiency of the system.

[0089] The embodiment of the present invention also provides an air conditioner, referring to Figure 3 The air conditioner includes the above-mentioned heat pump system and the control device 100, and the heat pump system is connected to the control device 100. Specifically, the refrigerant adjustment component 5, the compressor 1, and the throttling device 3 are connected to the control device 100.

[0090] The air conditioner further includes at least two temperature sensors 6, which are arranged one-to-one corresponding to the first heat exchangers 2. The temperature sensors 6 are arranged in the indoor space regulated by the corresponding first heat exchanger 2 to detect the corresponding indoor temperature.

[0091] In the embodiments, reference Figure 3 The control device 100 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.

[0092] Those skilled in the art will understand that Figure 3 The 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.

[0093] like Figure 3 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0094] exist Figure 3 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.

[0095] 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.

[0096] Reference Figure 4 , 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:

[0097] Step S10, obtaining a first indoor temperature of the indoor space regulated by each first heat exchanger 2 having a heat exchange demand;

[0098] Corresponding ambient temperature sensors may be respectively arranged in different indoor spaces regulated by different first heat exchangers 2, and the first indoor temperature is detected by the corresponding ambient temperature sensors.

[0099] In one implementation, different first heat exchangers 2 can be provided in different indoor units, and users can turn on or off the indoor units according to their own needs. The first heat exchanger 2 in the turned-on indoor unit has a heat exchange demand, and the first heat exchanger 2 in the turned-off indoor unit does not have a heat exchange demand. Based on this, the on / off state of the indoor unit can be obtained, and based on the on / off state, the indoor temperature of the indoor space adjusted by the indoor unit currently in the turned-on state is obtained as the first indoor temperature here.

[0100] In another implementation, the current operating mode of the heat pump system can be obtained, and whether each first heat exchanger 2 has a heat exchange demand can be determined based on the operating mode, and the indoor temperature of the indoor space regulated by the first heat exchanger 2 that currently has a heat exchange demand is obtained as the first indoor temperature here.

[0101] In this embodiment, the heat exchange demand is a cooling demand, and the first heat exchanger 2 with the cooling demand is obtained to adjust the first indoor temperature of the indoor space.

[0102] Step S20, controlling the operation of the refrigerant regulating component 5 according to each of the first indoor temperatures and the corresponding set temperature.

[0103] The set temperature is the target temperature reached by the indoor environment of the corresponding indoor space. The set temperatures corresponding to different first heat exchangers 2 can be set according to the adjustment requirements of the corresponding indoor space.

[0104] Determine the relationship value (such as temperature difference value or relationship value, etc.) between each first indoor temperature and the corresponding set temperature, and determine the corresponding target connection state of each first heat exchanger 2 in the first state and the second state according to the relationship value. Control the operation of the refrigerant regulating component 5 according to all the target connection states so that each first heat exchanger 2 reaches the corresponding target connection state.

[0105] A control method for a heat pump system proposed in an embodiment of the present invention, the first indoor temperature and the corresponding set temperature can accurately reflect the high and low indoor load requirements that the corresponding first heat exchanger 2 needs to meet, and therefore the refrigerant regulating component 5 is controlled to operate according to each first indoor temperature and the corresponding set temperature so that each first heat exchanger 2 can adapt to the actual load and be connected to the return air port 01 and the intake air port 02, so that the evaporation temperature of each first heat exchanger 2 can adapt to the load changes to accurately meet different load requirements, and different first heat exchangers 2 can achieve differentiated regulation, thereby effectively improving the system energy efficiency.

[0106] 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, the step S20 includes:

[0107] Step S21, determining a first temperature difference between each of the first indoor temperatures and the corresponding set temperature;

[0108] The first temperature difference is a calculation result obtained by subtracting the corresponding set temperature from the second indoor temperature.

[0109] Step S22, when the first temperature difference satisfies a first condition, controlling the refrigerant regulating component 5 to operate so that the corresponding first heat exchanger 2 is connected to the return air port 01;

[0110] Step S23, when the first temperature difference satisfies the second condition, controlling the refrigerant regulating component 5 to operate so that the corresponding first heat exchanger 2 is connected to the air intake port 02;

[0111] The first condition includes that the first temperature difference is greater than a first threshold value, the second condition includes that the first temperature difference is less than a second threshold value or the first temperature difference is less than the second threshold value and lasts for a first time period, and the second threshold value is less than or equal to the first threshold value.

[0112] The first threshold is used to distinguish whether the corresponding indoor space is in a high-load state. When the first temperature difference value is greater than the first threshold, it indicates that the corresponding indoor space is in a high-load state; when the first temperature difference value is not greater than the first threshold, it indicates that it is not in a high-load state. The second threshold is used to distinguish whether the corresponding indoor space is in a low-load state. When the first temperature difference value is less than the second threshold, it indicates that the corresponding indoor space is in a low-load state; when the first temperature difference value is not less than the second threshold, it indicates that the corresponding indoor space is not in a low-load state.

[0113] The first threshold may range from 2 degrees to 10 degrees, and may be 4 degrees. The second threshold may range from 0.5 degrees to 2.5 degrees, and may be 2 degrees.

[0114] When all first temperature difference values ​​satisfy the first condition, the refrigerant regulating assembly 5 is controlled to operate so that all first heat exchangers 2 are connected to the return air port 01. In this embodiment, the refrigerant regulating assembly 5 includes at least two refrigerant components 51, and each refrigerant component 51 can be controlled to operate in the first operating state.

[0115] When all the first temperature difference values ​​satisfy the second condition, the refrigerant regulating assembly 5 can be controlled to operate so that all the second heat exchangers 4 are connected to the air intake port 02, or the refrigerant regulating assembly 5 can be controlled to operate so that at least one first heat exchanger 2 is connected to the air return port 01, and at least one first heat exchanger 2 is connected to the air intake port 02. In this embodiment, the refrigerant regulating assembly 5 includes the above-mentioned at least two refrigerant components 51, and each refrigerant component 51 can be controlled to operate in the second operating state, or at least one refrigerant component 51 can be controlled to operate in the first operating state and at least one refrigerant component 51 can be controlled to operate in the second operating state.

[0116] When there is a first temperature difference value that satisfies the first condition and a first temperature difference value that satisfies the second condition, the refrigerant regulating component 5 can be controlled to operate so that the first heat exchanger 2 corresponding to the first temperature difference value that satisfies the first condition is connected to the return air port 01, and the first heat exchanger 2 corresponding to the first temperature difference value that satisfies the second condition is connected to the intake port 02.

[0117] It should be noted that the execution order of step S22 and step S23 is not limited.

[0118] In this embodiment, the refrigerant regulating component 5 is used to accurately adapt to the different indoor space load requirements represented by the first temperature difference value to perform differential adjustments on different first heat exchangers 2. A large temperature difference indicates a high load. At this time, the first heat exchanger 2 is connected to the return air port 01, so that the temperature of the first heat exchanger 2 can be lower to meet the high load. A small temperature difference indicates a low load. At this time, the first heat exchanger 2 is connected to the intake port 02, so that the temperature of the first heat exchanger 2 can be higher to meet the low load, thereby accurately meeting the high and low loads of different spaces to effectively improve the energy efficiency of the heat pump system.

[0119] 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, after step S20, it also includes:

[0120] Step S30, obtaining a second indoor temperature corresponding to the first heat exchanger 2 currently connected to the air inlet 02;

[0121] Step S40, determining a second temperature difference between the second indoor temperature and the corresponding set temperature;

[0122] The second temperature difference value is a calculation result obtained by subtracting the corresponding set temperature from the second indoor temperature.

[0123] Step S50, when the second temperature difference satisfies the third condition, controlling the refrigerant regulating component 5 to operate so that the corresponding first heat exchanger 2 is connected to the return air port 01;

[0124] The third condition includes that the second temperature difference value is greater than a third threshold value or the second temperature difference value is greater than the third threshold value and lasts for a second time period, and the third threshold value is greater than the second threshold value and not greater than the first threshold value.

[0125] When step S20 is present, step S30 is performed when there is a first heat exchanger 2 connected to the air intake port 02. When all first heat exchangers 2 are connected to the air return port 01, the process returns to step S10.

[0126] The third threshold is specifically used to distinguish whether the indoor space has resumed a high load critical value. If the second temperature difference value is greater than the third threshold, it indicates that the corresponding indoor space has resumed a high load state; if the second temperature difference value is less than the third threshold, it indicates that the corresponding indoor space is still in a low load state.

[0127] When all the second temperature difference values ​​meet the third condition, the refrigerant regulating component 5 is controlled to adjust the operating parameters so that all the first heat exchangers 2 currently connected to the air intake port 02 are connected to the air return port 01. In this embodiment, the refrigerant regulating component 5 includes the above-mentioned at least two refrigerant components 51, and all the refrigerant components 51 currently operating in the second operating state can be controlled to switch to the first operating state.

[0128] When some of the second temperature difference values ​​meet the third condition and some of the second temperature difference values ​​do not meet the third condition, the refrigerant regulating component 5 is controlled to adjust the operating parameters to operate the first heat exchanger 2 corresponding to the second temperature difference value that currently meets the third condition to be connected to the return air port 01, and the first heat exchanger 2 corresponding to the second temperature difference value that currently does not meet the third condition to maintain connection with the intake port 02.

[0129] When all the second temperature difference values ​​do not satisfy the third condition, the refrigerant regulating component 5 is controlled to operate so that the first heat exchanger 2 currently connected to the air intake port 02 maintains being connected to the air intake port 02 .

[0130] In this embodiment, after the first heat exchanger 2 is connected to the air intake port 02, the first heat exchanger 2 is switched to be connected to the return air port 01 when the second temperature difference value satisfies the third condition, thereby ensuring that when the load of the indoor space increases, the connection state of the corresponding first heat exchanger 2 can be switched in time through the refrigerant regulating component 5, so as to effectively ensure that the system can meet the comfort of the corresponding indoor space.

[0131] It should be noted that, in the present embodiment, the third indoor temperature of the indoor space regulated by the first heat exchanger 2 currently connected to the return air port 01 can also be obtained. When the third indoor temperature meets the second condition, the refrigerant regulating component 5 is controlled to operate so that the corresponding first heat exchanger 2 is connected to the air intake port 02; when the third indoor temperature does not meet the second condition, the refrigerant regulating component 5 is controlled to operate so that the corresponding first heat exchanger 2 maintains connection with the return air port 01.

[0132] 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, the refrigerant regulating component 5 includes at least two refrigerant components 51, and the refrigerant components 51 are arranged in a one-to-one correspondence with the first heat exchanger 2. The refrigerant components 51 have a first operating state and a second operating state. The first valve port of the refrigerant component 51 is arranged corresponding to the return air port 01, and the second valve port of the refrigerant component 51 is arranged corresponding to the intake air port 02. The first operating state includes the first valve port being open and the second valve port being closed, and the second operating state includes the first valve port being closed and the second valve port being open. The control method of the heat pump system also includes:

[0133] When the refrigerant component 51 switches between the first operating state and the second operating state, the valve port to be opened among the first valve port and the second valve port is determined to be the first target valve port, and the valve port to be closed is determined to be the second target valve port;

[0134] Controlling the first target valve port to open at an initial opening and increase the opening to a maximum opening for operation;

[0135] When the first target valve port is opened to the maximum opening, controlling the second target valve port to be closed;

[0136] The flow cross-sectional area corresponding to the initial opening is not less than 50% of the outlet area corresponding to the maximum opening.

[0137] The refrigerant component 51 here may be the three-way valve mentioned above, the first valve port of the refrigerant component 51 here may be the second valve port of the three-way valve mentioned above, and the second valve port of the refrigerant component 51 here may be the third valve port of the three-way valve mentioned above.

[0138] The first operating state and the second operating state here are the same concepts as the first operating state and the second operating state mentioned above, and are not described in detail here.

[0139] When the refrigerant component 51 switches from the first operating state to the second operating state, the second valve port is the first target valve port, and the first valve port is the second target valve port. The second valve port is controlled to operate at an initial opening and increase to a maximum opening at a preset rate. When the second valve port is opened to the maximum opening, the first valve port is controlled to be completely closed.

[0140] When the refrigerant component 51 switches from the second operating state to the first operating state, the first valve port is the first target valve port, and the second valve port is the second target valve port. The first valve port is controlled to operate at an initial opening and increase to a maximum opening at a preset rate. When the first valve port is opened to the maximum opening, the first valve port is controlled to be completely closed.

[0141] In this embodiment, controlling the refrigerant component 51 in the above manner is beneficial to improving the switching efficiency of the connection state of the first heat exchanger 2, thereby further improving the energy efficiency of the heat pump system.

[0142] Further, based on any of the above embodiments, the interval duration of switching between different operating states of the refrigerant regulating component 5 is greater than a preset duration.

[0143] In this embodiment, the refrigerant regulating assembly 5 includes at least two refrigerant components 51, and the refrigerant components 51 are arranged one-to-one corresponding to the first heat exchanger 2. The interval time of switching between the first operating state and the second operating state of the refrigerant component 51 is greater than the preset time.

[0144] The preset duration ranges from [10min, 60min], for example, 20min, 30min, or 40min, etc. It can be a parameter set by the user or a parameter determined according to the outdoor ambient temperature.

[0145] In this embodiment, limiting the interval duration of switching between the operating states of the refrigerant regulating component 5 to be greater than the preset duration is conducive to achieving an effective balance between indoor comfort requirements and energy-saving requirements of the heat pump system.

[0146] Further, based on any of the above embodiments, after the step of determining a first temperature difference between each of the first indoor temperatures and the corresponding set temperature, the step further includes:

[0147] When all of the first temperature difference values ​​satisfy the second condition, the refrigerant regulating component 5 is controlled to operate so that at least one of the first heat exchangers 2 is connected to the return air port 01 .

[0148] Specifically, the first heat exchanger 2 corresponding to the largest first temperature difference value among all the first temperature difference values ​​can be determined as the target heat exchanger, and the refrigerant regulating component 5 is controlled to operate so that the target heat exchanger is connected to the return air port 01, and other first heat exchangers 2 other than the target heat exchanger are connected to the intake port 02.

[0149] In this embodiment, by ensuring that at least one first heat exchanger 2 is connected to the return air port 01 in the above manner, excessive exhaust temperature can be avoided, which is beneficial to the energy efficiency of the heat pump system while ensuring the stability and reliability of the operation of the compressor 1.

[0150] In other embodiments, when all the first temperature difference values ​​satisfy the second condition, the refrigerant regulating component 5 is controlled to operate so that the designated first heat exchanger 2 is connected to the return air port 01, and other first heat exchangers 2 other than the designated first heat exchanger 2 are connected to the intake port 02.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0155] 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 heat pump system, characterized in that: The heat pump system comprises a refrigerant circuit, the refrigerant circuit comprises a compressor, at least two first heat exchangers and a refrigerant regulating component, the compressor is provided with an air return port and an air intake port arranged near the air return port; The at least two first heat exchangers, the return air port and the intake air port are all connected to the refrigerant regulating component, and the refrigerant regulating component is used to switch the connection state of each first heat exchanger between a first state and a second state, the first state includes the first heat exchanger being connected to the return air port, and the second state includes the first heat exchanger being connected to the intake air port.

2. The heat pump system according to claim 1, characterized in that: The refrigerant regulating component includes at least two refrigerant components, and the refrigerant components are arranged in a one-to-one correspondence with the first heat exchangers. Each of the first heat exchangers is connected to the return air port and the intake air port through the corresponding refrigerant component.

3. The heat pump system according to claim 1, characterized in that: The heat pump system further includes a second heat exchanger, the compressor further includes an exhaust port, and the refrigerant regulating component includes: A reversing assembly, wherein the exhaust port, the return air port and the second heat exchanger are all in communication with the reversing assembly; At least two refrigerant components are provided in one-to-one correspondence with the first heat exchanger, each first heat exchanger is connected to the corresponding refrigerant component, and the reversing assembly and the air intake port are respectively connected to each refrigerant component.

4. The heat pump system according to claim 2 or 3, characterized in that: The refrigerant component includes a three-way valve.

5. The heat pump system according to any one of claims 1 to 3, characterized in that: An evaporation pressure of the first heat exchanger corresponding to the first state is lower than an evaporation pressure of the first heat exchanger corresponding to the second state.

6. The heat pump system according to claim 5, characterized in that: The ratio of the pressure of the air inlet to the pressure of the air return outlet is not less than 10% and not more than 50%; And / or, the ratio of the compression stroke corresponding to the air intake port to the compression stroke corresponding to the air return port is not less than 10% and not more than 50%.

7. The heat pump system according to any one of claims 1 to 3, characterized in that: A one-way valve is arranged on the air intake port or on a pipeline between the refrigerant regulating component and the air intake port, and the one-way valve is arranged to conduct one-way flow from the refrigerant regulating component to the air intake port.

8. The heat pump system according to any one of claims 1 to 3, characterized in that: The frequency range of the compressor is not less than 8 Hz and not more than 160 Hz.

9. A control method for a heat pump system, based on the heat pump system according to any one of claims 1 to 8, characterized in that: The control method of the heat pump system further includes: Obtaining a first indoor temperature of each indoor space regulated by the first heat exchanger having a heat exchange demand; The operation of the refrigerant regulating component is controlled according to each of the first indoor temperatures and the corresponding set temperature.

10. The control method of the heat pump system according to claim 9, characterized in that: The step of controlling the operation of the refrigerant regulating component according to each of the first indoor temperatures and the corresponding set temperature comprises: Determine a first temperature difference between each of the first indoor temperatures and the corresponding set temperature; When the first temperature difference satisfies a first condition, controlling the refrigerant regulating component to operate so that the corresponding first heat exchanger is connected to the return air port; When the first temperature difference satisfies a second condition, controlling the refrigerant regulating component to operate so that the corresponding first heat exchanger is connected to the air intake port; The first condition includes that the first temperature difference is greater than a first threshold value, the second condition includes that the first temperature difference is less than a second threshold value or the first temperature difference is less than the second threshold value and lasts for a first time period, and the second threshold value is less than or equal to the first threshold value.

11. The control method of the heat pump system according to claim 10, characterized in that: After the step of controlling the operation of the refrigerant conditioning component according to each of the first indoor temperatures and the corresponding set temperature, the method further includes: Acquire a second indoor temperature corresponding to the first heat exchanger currently connected to the air intake port; Determine a second temperature difference between the second indoor temperature and the corresponding set temperature; When the second temperature difference satisfies a third condition, controlling the refrigerant regulating component to operate so that the corresponding first heat exchanger is connected to the return air port; The third condition includes that the second temperature difference value is greater than a third threshold value or the second temperature difference value is greater than the third threshold value and lasts for a second time period, and the third threshold value is greater than the second threshold value and not greater than the first threshold value.

12. The control method of the heat pump system according to claim 10, characterized in that: The refrigerant regulating component includes at least two refrigerant components, the refrigerant components are arranged in a one-to-one correspondence with the first heat exchanger, the refrigerant components have a first operating state and a second operating state, the first valve port of the refrigerant component is arranged corresponding to the return air port, the second valve port of the refrigerant component is arranged corresponding to the intake air port, the first operating state includes the first valve port being open and the second valve port being closed, the second operating state includes the first valve port being closed and the second valve port being open, and the control method of the heat pump system further includes: When the refrigerant component switches between the first operating state and the second operating state, determining that the valve port to be opened among the first valve port and the second valve port is a first target valve port and the valve port to be closed is a second target valve port; Controlling the first target valve port to open at an initial opening and increase the opening to a maximum opening for operation; When the first target valve port is opened to the maximum opening, controlling the second target valve port to be closed; The flow cross-sectional area corresponding to the initial opening is not less than 50% of the outlet area corresponding to the maximum opening.

13. The control method of the heat pump system according to claim 10, characterized in that: After the step of determining the first temperature difference between each of the first indoor temperatures and the corresponding set temperature, the method further includes: When all of the first temperature difference values ​​satisfy the second condition, the refrigerant regulating component is controlled to operate so that at least one of the first heat exchangers is connected to the return air port.

14. The control method of a heat pump system according to any one of claims 9 to 13, characterized in that: The interval duration for switching the refrigerant regulating component between different operating states is greater than a preset duration.

15. An air conditioner, characterized in that: The air conditioner comprises: The heat pump system according to any one of claims 1 to 8; A control device, the heat pump system is connected to the control device, the control device comprises: a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor, the control program of the heat pump system, when executed by the processor, implements the steps of the control method of the heat pump system as described in any one of claims 9 to 14.

16. 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 9 to 14 are implemented.

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