Control method and control device of air conditioner, air conditioner and storage medium

Abstract

The application discloses a control method and device of an air conditioner, the air conditioner and a storage medium, and belongs to the technical field of air conditioners. The air conditioner comprises a main circuit, the main circuit comprising a compressor, a first reversing component and a first liquid storage device forming a circulating loop; and at least one liquid storage branch, and the liquid storage branch is arranged between the first reversing component and the first liquid storage device, and has a conducting state and a cut-off state. The control method of the air conditioner comprises the following steps: acquiring a first real-time running frequency of the compressor; judging whether the first real-time running frequency is greater than a first preset threshold value; if yes, controlling the at least one liquid storage branch to switch from the cut-off state to the conducting state; and if no, controlling the at least one liquid storage branch to switch from the conducting state to the cut-off state, or controlling the state of all the liquid storage branches to be unchanged. The application can not only better ensure the anti-liquid-knock capability of the compressor in high-frequency operation, but also ensure the energy efficiency of the air conditioner in low-frequency operation of the compressor.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to control methods, control devices, air conditioners, and storage media for air conditioners. Background Technology

[0002] In related technologies, the compressor of an air conditioner operates at different frequencies in cooling and heating modes. Especially during ultra-low temperature heating, the compressor operates at a very high frequency, and refrigerant evaporation is also more difficult, resulting in a greater risk of liquid slugging. In this case, a large-capacity liquid receiver can better ensure the compressor's ability to prevent liquid slugging during high-frequency operation.

[0003] However, when the compressor is running at low frequency, a large-capacity liquid storage tank can affect the energy efficiency of the air conditioner.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this invention is to provide a control method, control device, air conditioner, and storage medium for an air conditioner, aiming to solve the technical problem that the energy efficiency of an air conditioner is affected by a large-capacity liquid storage tank.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a control method for an air conditioner, the air conditioner comprising:

[0007] The main circuit includes a compressor, a first commutation assembly, and a first liquid storage device forming a circulation loop; and

[0008] At least one liquid storage branch is provided, and the liquid storage branch is disposed between the first reversing component and the first liquid storage device. The liquid storage branch has a conducting state and a cut-off state.

[0009] The method includes:

[0010] Obtain the compressor's first real-time operating frequency;

[0011] Determine whether the first real-time operating frequency is greater than the first preset threshold;

[0012] If the first real-time operating frequency is greater than the first preset threshold, then control at least one of the liquid storage branches to switch from the cut-off state to the on state;

[0013] If the first real-time operating frequency is less than or equal to the first preset threshold, then at least one of the liquid storage branches is controlled to switch from the on state to the off state, or the state of all the liquid storage branches is controlled to remain unchanged.

[0014] In one embodiment, after controlling at least one of the liquid storage branches to switch from the on state to the off state if the first real-time operating frequency is less than or equal to the first preset threshold, or controlling the state of all the liquid storage branches to remain unchanged, the method further includes:

[0015] When a shutdown command is received for the air conditioner, at least one of the liquid storage branches is controlled to be disconnected from the main circuit.

[0016] In one embodiment, the method further includes:

[0017] When the air conditioner is turned on again, the second real-time operating frequency of the compressor is obtained;

[0018] Determine whether the second real-time operating frequency is less than a second preset threshold; the second preset threshold is less than the first preset threshold.

[0019] If the second real-time operating frequency is less than the second preset threshold, then control at least one of the liquid storage branches to switch from the on state to the off state;

[0020] If the second real-time operating frequency is greater than or equal to the second preset threshold, then at least one of the liquid storage branches is controlled to switch from the cut-off state to the conduction state, or the state of all the liquid storage branches is controlled to remain unchanged.

[0021] Secondly, the present invention also provides a control device for an air conditioner, the air conditioner comprising:

[0022] The main circuit includes a compressor, a first commutation assembly, and a first liquid storage device forming a circulation loop; and

[0023] At least one liquid storage branch is provided, and the liquid storage branch is disposed between the first reversing component and the first liquid storage device. The liquid storage branch has a conducting state and a cut-off state.

[0024] The control device includes:

[0025] The frequency acquisition module is used to acquire the compressor's first real-time operating frequency;

[0026] The frequency determination module is used to determine whether the first real-time operating frequency is greater than the first preset threshold.

[0027] The first control module is used to control at least one of the liquid storage branches to switch from the cut-off state to the on state if the first real-time operating frequency is greater than the first preset threshold.

[0028] The second control module is used to control at least one of the liquid storage branches to switch from the on state to the off state if the first real-time operating frequency is less than or equal to the first preset threshold, or to control the state of all the liquid storage branches to remain unchanged.

[0029] Thirdly, the present invention also provides an air conditioner comprising:

[0030] The main circuit includes a compressor, a first commutation assembly, and a first liquid storage device forming a circulation loop; and

[0031] At least one liquid storage branch is provided, and the liquid storage branch is disposed between the first reversing assembly and the first liquid storage device, the liquid storage branch having a conducting state and a cut-off state; and

[0032] The control device of an air conditioner.

[0033] In some embodiments, the liquid storage branch includes a second liquid storage device and a second reversing assembly;

[0034] The return gas end of the second liquid storage device is connected to the main circuit;

[0035] The second reversing assembly includes a first port, a second port and a third port. The second reversing assembly is connected to the main circuit through the first port and the third port. The second port is connected to the air inlet of the corresponding second liquid storage device.

[0036] The second reversing component has a first state and a second state. When the second reversing component is in the first state, the first port is connected to the second port so that the liquid storage branch is in a closed state. When the second reversing component is in the second state, the first port is connected to the third port so that the liquid storage branch is in a conductive state.

[0037] In some embodiments, the liquid storage branch further includes:

[0038] A one-way valve, one end of which is connected to the main circuit and the other end of which is connected to the second liquid storage device.

[0039] In some embodiments, the first reversing assembly has a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port being in communication with either the second valve port or the third valve port, the other of the second valve port and the third valve port being in communication with the fourth valve port, and the first valve port being in communication with the discharge end of the compressor.

[0040] The fourth valve port is connected to the second reversing component of the corresponding liquid storage branch.

[0041] In some embodiments, the first reversing component is a four-way valve; and / or

[0042] The second reversing component is a solenoid three-way valve.

[0043] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, performs the control method for an air conditioner as described above.

[0044] An air conditioner proposed in this invention provides an additional liquid storage branch that can be connected or disconnected sequentially on the main circuit. This allows the liquid storage volume in the main circuit to be increased when the first real-time operating frequency is greater than a first preset threshold, i.e., when the system liquid storage demand of the air conditioner is large. Alternatively, the liquid storage volume in the main circuit can be reduced or maintained when the first real-time operating frequency is less than the first preset threshold. This effectively ensures the anti-liquid slugging capability of the compressor during high-frequency operation and also ensures the energy efficiency of the air conditioner during low-frequency operation of the compressor. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of an embodiment of the air conditioner of the present invention;

[0046] Figure 2 This is a flowchart illustrating the first embodiment of the control method for an air conditioner according to the present invention;

[0047] Figure 3 This is a flowchart illustrating the second embodiment of the control method for an air conditioner according to the present invention;

[0048] Figure 4 This is a flowchart illustrating the third embodiment of the control method for an air conditioner according to the present invention;

[0049] Figure 5 This is a schematic diagram of the functional modules of the control device of the air conditioner of the present invention.

[0050] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0051] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0052] In related technologies, to prevent liquid slugging in the compressor during air conditioner operation, a liquid receiver or other liquid storage device is added before the compressor. This allows the liquid refrigerant to remain in the receiver, ensuring that the refrigerant entering the compressor is in a gaseous state. However, because the compressor operates at different frequencies during cooling and heating, especially during ultra-low temperature heating where the compressor frequency is very high and refrigerant evaporation is difficult, the risk of liquid slugging increases. While increasing the volume of the receiver can better ensure anti-liquid slugging capability during high-frequency compressor operation, increasing the receiver's volume during low-frequency compressor operation will affect the air conditioner's energy efficiency.

[0053] Therefore, in this embodiment of the invention, the overall liquid storage demand of the air conditioner is determined by the relationship between the first real-time operating frequency and the first preset threshold. Thus, when the liquid storage demand increases, at least one liquid storage branch is controlled to be open; when the liquid storage demand decreases or remains unchanged, at least one of the liquid storage branches is controlled to be closed, or the control state remains unchanged. This embodiment of the invention not only effectively ensures the anti-liquid slugging capability of the compressor during high-frequency operation, but also ensures the energy efficiency of the air conditioner during low-frequency compressor operation.

[0054] The inventive concept of this application is further illustrated below with reference to some specific embodiments.

[0055] See Figure 1 , Figure 1 An air conditioner is shown.

[0056] In this embodiment, the air conditioner includes:

[0057] The main circuit includes a compressor 1, a first commutation assembly 2, and a first liquid storage device 3a forming a circulation loop; and

[0058] At least one liquid storage branch is provided between the first commutation component 2 and the first liquid storage device 3a. The liquid storage branch includes a conducting state and a cut-off state.

[0059] In this embodiment, the pipeline between the first commutation component 2 of the liquid storage branch and the main circuit and the first liquid storage device 3a is connected in parallel.

[0060] When the liquid storage branch is in the conductive state, it is connected to the main circuit, which increases the liquid storage volume in the main circuit. When the liquid storage branch is in the closed state, it is disconnected from the main circuit, which decreases the liquid storage volume in the main circuit.

[0061] In this embodiment, by adjusting the liquid storage volume in the main circuit through at least one liquid storage branch, the high liquid storage volume required to ensure the anti-liquid slugging capability of the compressor during high-frequency operation can be better guaranteed, and the low liquid storage requirement required for the energy efficiency of the air conditioner can also be guaranteed when the compressor is running at low frequency.

[0062] The air conditioner may also include the control device of the air conditioner as described in the following device embodiments.

[0063] In one embodiment, the liquid storage branch includes: a second liquid storage device 3b and a second reversing assembly 4;

[0064] The second commutation component 4 has a first state and a second state. When the second commutation component 4 is in the first state, it connects the corresponding second liquid storage device 3b to the main circuit. When the second commutation component 4 is in the second state, it disconnects the corresponding second liquid storage device 3b from the main circuit.

[0065] In this embodiment, the second reversing assembly 4 has a reversing element, which can control whether the refrigerant flowing through this point continues to circulate in the main circuit or passes through the corresponding liquid storage branch before returning to the main circuit. When the second reversing assembly 4 is in the first state, the corresponding second liquid storage device 3b is connected to the main circuit, the main circuit is cut off at this point, and the refrigerant returns to the main circuit through the corresponding liquid storage branch. When the second reversing assembly 4 is in the second state, the corresponding second liquid storage device 3b is cut off from the main circuit, and the refrigerant directly passes through the second reversing assembly 4 and continues to circulate in the main circuit.

[0066] When multiple liquid storage branches are connected to the main circuit, the refrigerant flows through the multiple liquid storage branches in sequence, thereby increasing the liquid storage volume in the main circuit.

[0067] When the connection between a second liquid storage device 3b and the main circuit is cut off, the overall liquid storage volume in the main circuit is reduced to ensure the energy efficiency of the air conditioner when the compressor 1 is running at low frequency.

[0068] Therefore, this embodiment allows multiple liquid storage branches to be connected in series with the main circuit or partially connected in series with the main circuit, changing the liquid storage volume in the main circuit. This not only better ensures the compressor's anti-liquid slugging capability at high frequencies, but also ensures the air conditioner's energy efficiency when the compressor is running at low frequencies.

[0069] In one embodiment, see Figure 1 The air conditioner includes a compressor 1, a first commutation assembly 2, a first liquid storage device 3a, at least one second liquid storage device 3b, at least one second commutation assembly 4, an indoor heat exchanger, and an outdoor heat exchanger.

[0070] The compressor 1 has an exhaust end 11 and an intake end 12.

[0071] The first reversing assembly 2 has a first valve port D, a second valve port C, a third valve port E and a fourth valve port S. The first valve port D is connected to either the second valve port C or the third valve port E, and the fourth valve port S is connected to the other of the second valve port C and the third valve port E. The first valve port D is connected to the exhaust end 11.

[0072] One end of the first liquid storage device 3a is connected to the suction end 12 of the compressor, and the compressor 1, the first reversing assembly 2, and the first liquid storage device 3a constitute the main circuit. Multiple liquid storage branches are provided between the other end of the first liquid storage device 3a and the fourth valve port S.

[0073] The liquid storage branch includes a second liquid storage device 3b, a second reversing assembly 4, and a diversion pipe 5.

[0074] The diversion pipe 5 has a first port, a second port, and a third port. The diversion pipe 5 is connected to the main circuit through the first port and the second port. The third port of the diversion pipe 5 is connected to the return gas end 32 of the corresponding second liquid storage device 3b.

[0075] The second reversing assembly 4 includes a first port 41, a second port 42 and a third port 43. The first port 41 and the third port 43 are connected to the main circuit, and the second port 42 is connected to the air inlet 31 of the corresponding second liquid storage device 3b.

[0076] When the second reversing assembly 4 is in the first state, the first port 41 is connected to the second port 42. At this time, the refrigerant enters the second reversing assembly 4 through the first port 41, flows out through the second port 42 and is conducted to the corresponding second liquid storage device 3b, and then returns to the main circuit through the diversion pipe.

[0077] When the second reversing assembly 4 is in the second state, the first port 41 is connected to the third port 43. At this time, the refrigerant enters the second reversing assembly 4 through the first port 41 and flows out from the third port 43, still conducting in the main circuit.

[0078] The fourth valve port S is connected to the second reversing component 4 of at least one of the liquid storage branches that is far from the first liquid storage device 3a.

[0079] In heating mode, the high-temperature, high-pressure gaseous refrigerant from compressor 1 flows through the first and third valve ports of the first reversing assembly 2 and enters the indoor heat exchanger. After passing through the indoor heat exchanger, the high-temperature, high-pressure gaseous refrigerant transforms into liquid refrigerant. The liquid refrigerant is depressurized by a throttling device and enters the outdoor heat exchanger, where it evaporates and absorbs heat, becoming gaseous. Simultaneously, it absorbs heat from the outdoor air, becoming gaseous again. After becoming gaseous refrigerant, it sequentially passes through the fourth and second valve ports of the first reversing assembly 2, and all liquid storage branches connected to the main circuit, before re-entering compressor 1 to begin the next cycle.

[0080] In cooling mode, the refrigerant from compressor 1 flows through the first and second valves of the first reversing assembly 2 and enters the outdoor heat exchanger. After passing through the outdoor heat exchanger, it condenses and liquefies, releasing heat and becoming a liquid, while simultaneously releasing heat to the outside. The liquid refrigerant is depressurized by the throttling device and enters the indoor heat exchanger, where it evaporates and absorbs heat, becoming a gas and simultaneously absorbing heat from the indoor air, thereby lowering the indoor temperature. The gaseous refrigerant then passes through the third and fourth valves again and enters compressor 1 through all the liquid storage branches connected to the main circuit to begin the next cycle.

[0081] In one specific implementation, see [reference] Figure 1 The air conditioner includes a second liquid storage device 3b and a second commutation assembly 4.

[0082] The return gas end 32 of the first liquid storage device 3a is connected to the compressor 1, and the inlet gas end 31 is connected to the first port of the diverter pipe 5. The return gas end 32 of the second liquid storage device 3b is connected to the second port of the diverter pipe 5. The third port of the diverter pipe 5 is connected to the third port 43 of the second reversing assembly 4. The second port 42 is connected to the inlet gas end 31 of the second liquid storage device 3b. The third port 43 is connected to the fourth valve port S of the first reversing assembly 2.

[0083] Therefore, when the air conditioner is running at high frequency, the second port 42 of the second commutation assembly 4 can be connected to the first port 41. At this time, both the first liquid storage device 3a and the second liquid storage device 3b are connected to the circuit, increasing the overall liquid storage volume, so as to better ensure the anti-liquid slugging capability of the compressor 1 at high frequency. When the air conditioner is running at low frequency, the third port 43 of the second commutation assembly 4 can be connected to the first port 41. The connection between the second liquid storage device 3b and the circuit is cut off, and only the first liquid storage device 3a is connected in the circuit, thereby reducing the overall liquid storage volume of the liquid storage device 3 in the circuit, so as to ensure the energy efficiency of the air conditioner when the compressor 1 is running at low frequency.

[0084] Furthermore, in this embodiment, compared to the use of large-volume liquid storage tanks in related technologies, this embodiment can achieve the same liquid storage volume by connecting two small-volume liquid storage tanks to the circuit simultaneously. In this case, multiple smaller liquid storage devices 3 are easier to arrange.

[0085] In one embodiment, the liquid storage branch further includes a one-way valve 6, one end of which is connected to the main circuit and the other end of which is connected to the second liquid storage device 3b.

[0086] See Figure 1 A one-way valve 6 is connected between the diversion pipe 5 and the second liquid storage device 3b, so that the refrigerant can only flow in one direction here, in order to prevent the refrigerant in the main circuit from not flowing correctly to the compressor 1.

[0087] In one embodiment, the first liquid storage device 3a and the second liquid storage device 3b have the same shape.

[0088] In this embodiment, the first liquid storage device 3a and the second liquid storage device 3b with the same shape are easy to arrange and combine. Compared with directly using a large-capacity liquid storage tank, it is more convenient to install the liquid storage device in the air conditioner in a small space.

[0089] In one embodiment, the first reversing component 2 is a four-way valve; the second reversing component 4 is a solenoid three-way valve.

[0090] The electromagnetic three-way valve can be a two-position electromagnetic three-way valve. In the first state, the first port 41 and the second port 42 are connected. In the second state, the first port 41 and the third port 43 are connected. The second reversing assembly 4 can switch between the first state and the second state based on the control of the controller.

[0091] Based on the air conditioner provided in the above embodiments, a first embodiment of the control method for the air conditioner of the present invention is proposed. (See also...) Figure 2 , Figure 2 A flowchart illustrating the first embodiment of the control method for the air conditioner of the present invention is shown.

[0092] In this embodiment, the method includes:

[0093] Step S101: Obtain the first real-time operating frequency of the compressor.

[0094] Step S102: Determine whether the first real-time running frequency is greater than the first preset threshold.

[0095] Step S103: If the first real-time operating frequency is greater than the first preset threshold, control at least one of the liquid storage branches to switch from the cut-off state to the conduction state.

[0096] Step S104: If the first real-time operating frequency is less than or equal to the first preset threshold, control at least one of the liquid storage branches to switch from the on state to the off state, or control the state of all the liquid storage branches to remain unchanged.

[0097] Specifically, the liquid storage requirement of the air conditioner is mainly related to the frequency of the compressor 1. Therefore, when the air conditioner is running, the first real-time operating frequency of the compressor 1 can be monitored in real time, and it can be determined whether the air conditioner has a large liquid storage requirement if the first real-time operating frequency of the compressor 1 is greater than the first preset threshold.

[0098] If the first preset threshold is F0, and if the frequency range of compressor 1 is 30-130Hz, the first preset threshold can be 120Hz. The first real-time operating frequency is F1. When F1 > F0, it can be determined that compressor 1 is operating at high frequency, that is, the risk of liquid slugging in the air conditioner is increased, and there is a large demand for liquid storage.

[0099] When there is a large demand for liquid storage, at least one liquid storage branch is controlled to switch from a cut-off state to a conductive state. For example, the first port 41 and the second port 42 of at least one second reversing assembly 4 can be connected, i.e., switched to the first state, and the corresponding second liquid storage device is connected to the main circuit. The second reversing assembly 4 connected to the first port 41 and the second port 42 connects the liquid storage device 3 corresponding to the reversing assembly to the circuit, so that the liquid storage device 3 is connected in series with the liquid storage device 3 already in the circuit, increasing the liquid storage volume in the circuit.

[0100] When there is no large liquid storage requirement, at least one of the liquid storage branches is controlled to switch from the conducting state to the cut-off state. For example, the first port 41 and the third port 43 of at least one second commutation component that has been integrated into the main circuit can be connected, cutting off the corresponding second liquid storage device from the main circuit, i.e., switching to the second state, thereby reducing the liquid storage volume in the circuit.

[0101] Alternatively, the state of all the aforementioned liquid storage branches can be kept unchanged. For example, the number of second reversing components 4 connecting the first port 41 and the second port 42 can also be kept constant, i.e., the state of all second reversing components remains unchanged. In other words, the liquid storage volume already connected can meet the needs of the air conditioner.

[0102] Understandably, the air conditioner's liquid storage requirements vary at different operating stages. Therefore, the value of the first preset threshold can be adjusted according to the specific situation. For example, when the air conditioner is repeatedly turned on and off after being turned off, the first preset threshold can be set to F1-ΔF, where 8Hz≤ΔF≤15Hz. ΔF can be selected as 10Hz.

[0103] It is worth mentioning that controlling at least one liquid storage branch to switch from the off state to the on state, or controlling at least one liquid storage branch to switch from the on state to the off state, here the specific number of at least one liquid storage branch can be multiple or all. This number can be specifically set according to the specific situation of the air conditioner circuit, such as controlling only one liquid storage branch to operate at a time or controlling two liquid storage branches to operate.

[0104] Alternatively, in some embodiments, the specific number of at least one liquid storage branch can be determined based on the difference between a first real-time operating frequency and a first preset threshold. The specific number of at least one liquid storage branch is determined by the threshold range in which the difference falls. For example, when the difference is within the first threshold range, one liquid storage branch is controlled to switch from a cutoff state to a conducting state, or one liquid storage branch is controlled to switch from a conducting state to a cutoff state. When the difference is within the second threshold range, two liquid storage branches are controlled to switch from a cutoff state to a conducting state, or two liquid storage branches are controlled to switch from a conducting state to a cutoff state. The specific distribution and number of threshold ranges can be set according to the specific situation of the air conditioner circuit, and are not limited here.

[0105] In one specific embodiment, the air conditioner circuit has a total of 5 second liquid storage devices 3b, of which 2 have been connected to the circuit.

[0106] When there is a large liquid storage requirement, that is, when F1 > F0, control two or all of the remaining three second reversing components to connect the first port 41 to the second port 42 so that the corresponding second liquid storage device 3b is connected to the circuit.

[0107] When there is no large liquid storage requirement, that is, when F1≤F0, control the first port 41 and the third port 43 of one or two of the second reversing components to connect them, so as to cut off the corresponding second liquid storage device 3b.

[0108] Furthermore, after step S104, the method further includes:

[0109] Step S105: When a shutdown command for the air conditioner is received, at least one of the liquid storage branches is controlled to be disconnected from the main circuit.

[0110] In this embodiment, when the air conditioner is turned off, at least one, such as one or more, or all of the first port 41 and the third port 43 of the second reversing components 4 are connected to reduce the number of second liquid storage devices 3b connected to the main circuit. For example, only the first liquid storage device 3a is connected to the main circuit, and the rest are disconnected from the main circuit to avoid refrigerant accumulation in the second liquid storage device 3b and reduce the energy efficiency of the air conditioner.

[0111] Furthermore, based on the first embodiment of the control method for the air conditioner of the present invention, a second embodiment of the control method for the air conditioner of the present invention is proposed. (See reference...) Figure 3 , Figure 3 A flowchart illustrating a second embodiment of the control method for an air conditioner according to the present invention is shown.

[0112] In this embodiment, after step S104, the method further includes:

[0113] Step S106: When the air conditioner is turned on again, obtain the second real-time operating frequency of the compressor;

[0114] Step S107: Determine whether the second real-time operating frequency is less than the second preset threshold;

[0115] Step S108: If the second real-time operating frequency is less than the second preset threshold, control at least one of the liquid storage branches to switch from the conducting state to the cut-off state;

[0116] Step S109: If the second real-time operating frequency is greater than or equal to the second preset threshold, control at least one of the liquid storage branches to switch from the cut-off state to the conduction state, or control the state of all the liquid storage branches to remain unchanged.

[0117] The second real-time operating frequency is F2, the first preset threshold is F1, and the second preset threshold is F2. The second preset threshold satisfies F2=F1-△F, where 8hz≤△F≤15hz, such as 10Hz.

[0118] In this embodiment, after the air conditioner is turned off and then turned back on, the real-time operating frequency of compressor 1 is detected.

[0119] If the real-time operating frequency of compressor 1 is less than the second preset threshold, i.e., F2 < F0 - ΔF is true, it indicates that the frequency decreases after the air conditioner restarts. At this time, it can be determined that the air conditioner's liquid storage demand has decreased, so the number of second commutation components 4 connected to the first port 41 and the second port 42 can be reduced. That is, the number of second commutation components 4 connected to the first port 41 and the third port 43 can be increased. The second commutation components 4 connected to the first port 41 and the third port 43 cut off the connection between the corresponding second liquid storage device 3b and the main circuit, reducing the liquid storage volume in the main circuit.

[0120] If the second real-time operating frequency of compressor 1 is not less than the second preset threshold, i.e., F2≥F0-△F holds true, it indicates that the frequency did not decrease after the air conditioner was restarted, and the air conditioner's liquid storage requirement did not decrease. Therefore, the number of second commutation components 4 connected to the first port 41 and the second port 42 can be increased. The second commutation components 4 connected to the first port 41 and the second port 42 connect the second liquid storage device 3b corresponding to the commutation component to the circuit, so that the second liquid storage device 3b is connected in series with the second liquid storage device 3b already in the main circuit, increasing the liquid storage volume in the circuit. Alternatively, the number of second commutation components 4 connected to the first port 41 and the second port 42 can remain unchanged, i.e., the liquid storage volume already connected can meet the air conditioner's requirements.

[0121] In one specific embodiment, the air conditioner includes a liquid storage branch.

[0122] At this time, refer to Figure 4 The method includes the following steps:

[0123] Step S201: Obtain the first real-time operating frequency of the compressor;

[0124] Step S202: Determine whether the first real-time running frequency is greater than the first preset threshold.

[0125] Step S203: If the first real-time operating frequency is greater than the first preset threshold, control the second reversing component to switch to the first state, and connect the corresponding second liquid storage device 3b to the main circuit;

[0126] Step S204: If the first real-time operating frequency is less than or equal to the first preset threshold, control the second reversing component to switch to the second state, and disconnect the corresponding second liquid storage device 3b from the main circuit.

[0127] In this embodiment, it is determined whether F1>F0 is true. If it is true, it is determined that the system has a large liquid storage demand. The electric three-way valve is powered on and the first port 41 and the second port 42 are connected. The refrigerant flows through the first liquid storage device 3a and the second liquid storage device 3b.

[0128] Otherwise, it is determined that the system has a small liquid storage requirement, the electric three-way valve remains in the de-energized and closed state, the first port 41 is connected to the third port 43, and the refrigerant only flows through the first liquid storage device 3a.

[0129] As an example, see Figure 5 The present invention also proposes a control device for an air conditioner.

[0130] In this embodiment, the control device for the air conditioner includes:

[0131] Frequency acquisition module 10 is used to acquire the first real-time operating frequency of the compressor;

[0132] The frequency determination module 20 is used to determine whether the first real-time operating frequency is greater than the first preset threshold.

[0133] The first control module 30 is used to control at least one of the liquid storage branches to switch from the cut-off state to the on state if necessary.

[0134] The second control module 40 is used to control at least one of the liquid storage branches to switch from the on state to the off state if the first real-time operating frequency is less than or equal to the first preset threshold, or to control the state of all the liquid storage branches to remain unchanged.

[0135] Other embodiments of the control device for the air conditioner of the present invention refer to the above method embodiments, and will not be repeated here.

[0136] Furthermore, embodiments of the present invention also propose a computer-readable storage medium storing a control program for an air conditioner. When executed by a processor, the control program implements the steps of the air conditioner control method described above. Therefore, further details will not be repeated here. Additionally, the beneficial effects of using the same method will not be repeated. For technical details not disclosed in the embodiments of the computer-readable storage medium involved in this application, please refer to the description of the method embodiments of this application. As an example, program instructions can be deployed to execute on a single computing device, or on multiple computing devices located at one location, or on multiple computing devices distributed across multiple locations and interconnected via a communication network.

[0137] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0138] It should also be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0139] Through the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general-purpose hardware, and of course, it can also be implemented by special hardware including application-specific integrated circuits, special CPUs, special memory, special components, etc. Generally, any function performed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be diverse, such as analog circuits, digital circuits, or special-purpose circuits. However, for the present invention, software program implementation is more often the preferred implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a computer floppy disk, USB flash drive, portable hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0140] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method of an air conditioner, characterized by, The application relates to an air conditioner, which comprises: a main circuit comprising a compressor, a first switching assembly and a first liquid storage device; at least one liquid storage branch circuit, which is arranged between the first switching assembly and the first liquid storage device, has a conducting state and a cut-off state, comprises a second liquid storage device and a second switching assembly, and is in communication with the main circuit at a gas inlet end of the second liquid storage device; the second switching assembly comprises a first pipe opening, a second pipe opening and a third pipe opening, is in communication with the main circuit through the first pipe opening and the third pipe opening, and is in communication with the gas inlet end of the corresponding second liquid storage device through the second pipe opening; the second switching assembly has a first state and a second state; when the second switching assembly is in the first state, the first pipe opening is in communication with the second pipe opening, so that the liquid storage branch circuit is in the cut-off state; when the second switching assembly is in the second state, the first pipe opening is in communication with the third pipe opening, so that the liquid storage branch circuit is in the conducting state; when the liquid storage branch circuit is in the conducting state, refrigerant returns to the main circuit through the liquid storage branch circuit; and when the liquid storage branch circuit is in the cut-off state, the refrigerant flows in the main circuit. The method comprises the following steps: acquiring a first real-time running frequency of the compressor; judging whether the first real-time running frequency is greater than a first preset threshold value; if the first real-time running frequency is greater than the first preset threshold value, switching at least one liquid storage branch circuit from the cut-off state to the conducting state; if the first real-time running frequency is less than or equal to the first preset threshold value, switching at least one liquid storage branch circuit from the conducting state to the cut-off state.

2. The control method of the air conditioner according to claim 1, characterized by, After the first real-time running frequency is less than or equal to the first preset threshold value, at least one liquid storage branch circuit is switched from the conducting state to the cut-off state, or the state of all the liquid storage branch circuits remains unchanged, the method further comprises the following steps: when a shutdown instruction of the air conditioner is received, cutting off at least one liquid storage branch circuit from the main circuit.

3. The control method of an air conditioner according to claim 1 or 2, characterized by, The method further comprises the following steps: when the air conditioner is started again, acquiring a second real-time running frequency of the compressor; judging whether the second real-time running frequency is less than a second preset threshold value; the second preset threshold value is less than the first preset threshold value; if the second real-time running frequency is less than the second preset threshold value, switching at least one liquid storage branch circuit from the conducting state to the cut-off state; if the second real-time running frequency is greater than or equal to the second preset threshold value, switching at least one liquid storage branch circuit from the cut-off state to the conducting state, or controlling the state of all the liquid storage branch circuits to remain unchanged.

4. A control device for an air conditioner, characterized by comprising: The application relates to an air conditioner, which comprises: a main circuit comprising a compressor, a first switching assembly and a first liquid storage device; and At least one liquid storage branch is arranged between the first switching assembly and the first liquid storage device, and has a conducting state and a cut-off state; the liquid storage branch comprises a second liquid storage device and a second switching assembly; a gas return end of the second liquid storage device is in communication with the main circuit; the second switching assembly comprises a first port, a second port and a third port, and is in communication with the main circuit through the first port and the third port; the second port is in communication with a gas inlet end of the corresponding second liquid storage device; the second switching assembly has a first state and a second state; when the second switching assembly is in the first state, the first port is in communication with the second port, so that the liquid storage branch is in the cut-off state; when the second switching assembly is in the second state, the first port is in communication with the third port, so that the liquid storage branch is in the conducting state; when the liquid storage branch is in the conducting state, the refrigerant returns to the main circuit through the liquid storage branch; when the liquid storage branch is in the cut-off state, the refrigerant flows in the main circuit; The control device comprises: a frequency acquisition module configured to acquire a first real-time operating frequency of the compressor; a frequency judgment module configured to judge whether the first real-time operating frequency is greater than a first preset threshold value; a first control module configured to control at least one liquid storage branch to switch from the cut-off state to the conducting state if the first real-time operating frequency is greater than the first preset threshold value; a second control module configured to control at least one liquid storage branch to switch from the conducting state to the cut-off state if the first real-time operating frequency is less than or equal to the first preset threshold value.

5. An air conditioner characterized by comprising: comprise: a main circuit comprising a compressor, a first switching assembly and a first liquid storage device forming a circulating loop; and at least one liquid storage branch arranged between the first switching assembly and the first liquid storage device, and having a conducting state and a cut-off state; when the liquid storage branch is in the conducting state, the refrigerant returns to the main circuit through the liquid storage branch; when the liquid storage branch is in the cut-off state, the refrigerant flows in the main circuit; and the control device of the air conditioner of claim 4; wherein the liquid storage branch comprises a second liquid storage device and a second switching assembly; a gas return end of the second liquid storage device is in communication with the main circuit; the second switching assembly comprises a first port, a second port and a third port, and is in communication with the main circuit through the first port and the third port; the second port is in communication with a gas inlet end of the corresponding second liquid storage device; wherein the second switching assembly has a first state and a second state; when the second switching assembly is in the first state, the first port is in communication with the second port, so that the liquid storage branch is in the cut-off state; when the second switching assembly is in the second state, the first port is in communication with the third port, so that the liquid storage branch is in the conducting state.

6. The air conditioner of claim 5, wherein The liquid storage branch further comprises: A one-way valve, one end of which is in communication with the main circuit, and the other end of which is in communication with the second liquid storage device.

7. The air conditioner of claim 5, wherein The first reversing assembly has a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is in communication with any one of the second valve port and the third valve port, the other one of the second valve port and the third valve port is in communication with the fourth valve port, and the first valve port is in communication with the exhaust end of the compressor; The fourth valve port is in communication with the second reversing assembly of the corresponding connected liquid storage branch.

8. The air conditioner according to any one of claims 5 to 7, characterized by The first reversing assembly is a four-way valve; and / or The second reversing assembly is an electromagnetic three-way valve.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, wherein the computer program, when executed by the processor, performs the control method of the air conditioner according to any one of claims 1 to 3.

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