Air conditioner and defrosting control method thereof

Abstract

The present invention discloses an air conditioner and a defrost control method for the air conditioner. When the air conditioner is in a heating mode, the outdoor ambient temperature is obtained, the continuous running time after the air conditioner is turned on is recorded, and the initial value of the number of actions of the solenoid valve is set to 0; when the outdoor ambient temperature does not reach a first preset temperature, it is determined whether the number of actions of the solenoid valve is 0; if so, the continuous running time after the air conditioner is turned on is set as the whole machine running time after the solenoid valve is powered off, and it is determined whether the outdoor ambient temperature reaches a second preset temperature; if not, it is determined whether the outdoor ambient temperature reaches the second preset temperature; when the outdoor ambient temperature does not reach the second preset temperature, if the whole machine running time after the solenoid valve is powered off reaches a first preset action cycle, the solenoid valve is controlled to be powered on and the outdoor fan is stopped to perform defrosting. The air conditioner can be defrosted without stopping heating, the low-temperature heating amount is increased, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a defrosting control method for the air conditioner. Background Art

[0002] When traditional air conditioners realize the defrost function, they generally need to power on and off the four-way valve. During the defrost process, the four-way valve often needs to be de-energized to put the air conditioner in a cooling state, and use the high-temperature refrigerant discharged by the compressor for heat exchange defrosting. However, this defrosting method is in a cooling state. If the air conditioner is originally in a low-temperature heating state, the indoor unit will be unable to continue to provide heat to the room, resulting in low heating capacity of the air conditioner during low-temperature heating, which will also bring a bad user experience. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide an air conditioner and a defrost control method for the air conditioner, which can enable the air conditioner to defrost in a low-temperature heating state while still continuing to heat, thereby increasing the low-temperature heating capacity of the air conditioner and improving the user experience.

[0004] In order to achieve the above object, an embodiment of the present invention provides an air conditioner, comprising:

[0005] The refrigerant circulation circuit circulates the refrigerant in a circuit consisting of a compressor, a four-way valve, a condenser, a throttling component and an evaporator, wherein the throttling component is composed of a throttling device and a solenoid valve connected in parallel;

[0006] Compressor, used to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas;

[0007] An outdoor heat exchanger and an indoor heat exchanger, wherein one works as a condenser and the other works as an evaporator;

[0008] A four-way valve is used to control the flow direction of the refrigerant in the refrigerant circulation loop so that the outdoor heat exchanger and the indoor heat exchanger are switched between serving as a condenser and an evaporator;

[0009] Outdoor fan, used to supply air to the outdoor heat exchanger;

[0010] A first temperature sensor is used to obtain the outdoor ambient temperature;

[0011] The controller is used to: after the air conditioner is turned on, when it is detected that the air conditioner is in heating mode, obtain the outdoor ambient temperature, record the continuous running time after the air conditioner is turned on, and set the initial value of the number of actions of the solenoid valve to 0; when the outdoor ambient temperature does not reach the first preset temperature, determine whether the number of actions of the solenoid valve is 0; if so, set the continuous running time after the air conditioner is turned on as the whole machine running time after the solenoid valve is powered off and closed, and determine whether the outdoor ambient temperature reaches the second preset temperature; if not, determine whether the outdoor ambient temperature reaches the second preset temperature; when the outdoor ambient temperature does not reach the second preset temperature, compare the whole machine running time after the solenoid valve is powered off and closed with the first preset action cycle; when the whole machine running time after the solenoid valve is powered off and closed reaches the first preset action cycle, control the solenoid valve to be powered on and open and the outdoor fan to stop for defrosting.

[0012] Furthermore, the controller is further configured to:

[0013] After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the first preset action cycle, setting the first preset action cycle as a heating and defrosting cycle;

[0014] After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a first preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1;

[0015] Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle;

[0016] When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition;

[0017] When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting;

[0018] After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

[0019] Furthermore, the controller is further configured to:

[0020] When the whole machine operation time after the solenoid valve is powered off and closed does not reach the first preset action cycle, re-determine whether the number of actions of the solenoid valve is 0, and perform corresponding processing according to the determination result;

[0021] When the total operating time of the air conditioner does not reach the preset regular defrost cycle, re-determining whether the outdoor ambient temperature reaches the first preset temperature, and performing corresponding processing according to the determination result;

[0022] When the air conditioner does not meet the preset normal defrosting condition, it is re-determined whether the outdoor ambient temperature reaches the first preset temperature, and corresponding processing is performed according to the determination result.

[0023] Furthermore, the controller is further configured to:

[0024] When the outdoor ambient temperature reaches a second preset temperature, the whole machine operation time after the solenoid valve is powered off is compared with a second preset action cycle; wherein the second preset action cycle is greater than the first preset action cycle;

[0025] When the whole machine operation time after the electromagnetic valve is powered off and closed reaches a second preset action cycle, the electromagnetic valve is controlled to be powered on and opened and the outdoor fan is stopped to perform defrosting processing.

[0026] Furthermore, the controller is further configured to:

[0027] After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the second preset action cycle, setting the second preset action cycle as a heating and defrosting cycle;

[0028] After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a second preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1;

[0029] Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle;

[0030] When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition;

[0031] When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting;

[0032] After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

[0033] To achieve the above objectives, an embodiment of the present invention further provides a defrost control method for an air conditioner, applicable to any of the above air conditioners, the method being executed by the controller and comprising:

[0034] After the air conditioner is turned on, when it is detected that the air conditioner is in a heating mode, the outdoor ambient temperature is obtained, the continuous operation time after the air conditioner is turned on is recorded, and the initial value of the number of operations of the solenoid valve is set to 0;

[0035] When the outdoor ambient temperature does not reach the first preset temperature, determining whether the number of operations of the solenoid valve is 0;

[0036] If so, the continuous running time after the air conditioner is turned on is set as the whole machine running time after the solenoid valve is powered off, and it is determined whether the outdoor ambient temperature reaches the second preset temperature; if not, it is determined whether the outdoor ambient temperature reaches the second preset temperature;

[0037] When the outdoor ambient temperature does not reach the second preset temperature, the whole machine operation time after the solenoid valve is powered off is compared with the first preset action cycle;

[0038] When the whole machine operation time after the electromagnetic valve is powered off and closed reaches a first preset action cycle, the electromagnetic valve is controlled to be powered on and opened and the outdoor fan is stopped to perform defrosting processing.

[0039] Furthermore, the method further comprises:

[0040] After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the first preset action cycle, setting the first preset action cycle as a heating and defrosting cycle;

[0041] After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a first preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1;

[0042] Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle;

[0043] When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition;

[0044] When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting;

[0045] After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

[0046] Furthermore, the method further comprises:

[0047] When the whole machine operation time after the solenoid valve is powered off and closed does not reach the first preset action cycle, re-determine whether the number of actions of the solenoid valve is 0, and perform corresponding processing according to the determination result;

[0048] When the total operating time of the air conditioner does not reach the preset regular defrost cycle, re-determining whether the outdoor ambient temperature reaches the first preset temperature, and performing corresponding processing according to the determination result;

[0049] When the air conditioner does not meet the preset normal defrosting condition, it is re-determined whether the outdoor ambient temperature reaches the first preset temperature, and corresponding processing is performed according to the determination result.

[0050] Furthermore, the method further comprises:

[0051] When the outdoor ambient temperature reaches a second preset temperature, the whole machine operation time after the solenoid valve is powered off is compared with a second preset action cycle; wherein the second preset action cycle is greater than the first preset action cycle;

[0052] When the whole machine operation time after the electromagnetic valve is powered off and closed reaches a second preset action cycle, the electromagnetic valve is controlled to be powered on and opened and the outdoor fan is stopped to perform defrosting processing.

[0053] Furthermore, the method further comprises:

[0054] After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the second preset action cycle, setting the second preset action cycle as a heating and defrosting cycle;

[0055] After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a second preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1;

[0056] Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle;

[0057] When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition;

[0058] When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting;

[0059] After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

[0060] Compared with the prior art, an embodiment of the present invention provides an air conditioner and a defrost control method for an air conditioner, wherein the air conditioner includes a refrigerant circulation circuit, so that the refrigerant circulates in a circuit composed of a compressor, a four-way valve, a condenser, a throttling component and an evaporator, wherein the throttling component is composed of a throttling device and a solenoid valve in parallel; it also includes a compressor for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas; it also includes an outdoor heat exchanger and an indoor heat exchanger, wherein one works for the condenser and the other works for the evaporator; it also includes a four-way valve for controlling the flow direction of the refrigerant in the refrigerant circulation circuit so that the outdoor heat exchanger and the indoor heat exchanger are switched between the condenser and the evaporator; it also includes an outdoor fan for supplying air to the outdoor heat exchanger; it also includes a first temperature sensor for obtaining the outdoor ambient temperature; it also includes a controller for: after the air conditioner is turned on, when it is detected that the air conditioner is in heating mode, obtaining the outdoor ambient temperature, and recording the temperature after the air conditioner is turned on Continuous running time, and the initial value of the number of actions of the solenoid valve is set to 0; when the outdoor ambient temperature does not reach the first preset temperature, it is determined whether the number of actions of the solenoid valve is 0; if so, the continuous running time after the air conditioner is turned on is set to the whole machine running time after the solenoid valve is powered off, and it is determined whether the outdoor ambient temperature reaches the second preset temperature. If not, it is determined whether the outdoor ambient temperature reaches the second preset temperature; when the outdoor ambient temperature does not reach the second preset temperature, the whole machine running time after the solenoid valve is powered off is compared with the first preset action cycle; when the whole machine running time after the solenoid valve is powered off reaches the first preset action cycle, the solenoid valve is controlled to be powered on and the outdoor fan is stopped to perform defrosting. The embodiment of the present invention connects a solenoid valve in parallel at the position of the throttling device. Under the action of special control logic, the air conditioner can achieve defrosting in the low-temperature heating state while still continuing to heat, thereby increasing the low-temperature heating capacity of the air conditioner and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 1 is a schematic diagram of the external structure of an air conditioner provided by an embodiment of the present invention;

[0062] Figure 2 This is a schematic diagram of the internal structure of an air conditioner provided by an embodiment of the present invention;

[0063] Figure 3 This is a structural diagram of a throttling component of an air conditioner provided by an embodiment of the present invention;

[0064] Figure 4 This is a flowchart of a controller for an air conditioner provided by an embodiment of the present invention;

[0065] Figure 5 is another working flow diagram of a controller of an air conditioner provided by an embodiment of the present invention;

[0066] Figure 6 This is another working flow diagram of a controller of an air conditioner provided by an embodiment of the present invention;

[0067] Figure 7 This is another working flow diagram of a controller of an air conditioner provided by an embodiment of the present invention;

[0068] Figure 8 1 is a flow chart of a defrost control method for an air conditioner provided by an embodiment of the present invention;

[0069] Figure 9 This is another flow chart of a defrost control method for an air conditioner provided by an embodiment of the present invention;

[0070] Figure 10 This is another flow chart of a defrost control method for an air conditioner provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0071] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this technical field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0072] See also Figures 1 to 3 As shown, Figure 1 1 is a schematic diagram of the external structure of an air conditioner provided by an embodiment of the present invention. Figure 2 1 is a schematic diagram of the internal structure of an air conditioner provided by an embodiment of the present invention. Figure 3 Schematic diagram of the structure of a throttling component of an air conditioner provided by an embodiment of the present invention; Figure 1 As shown, the external structure of the air conditioner includes an indoor unit 100 and an outdoor unit 200, wherein the indoor unit 100 is used to adjust the temperature and humidity of the indoor air, and the outdoor unit 200 is connected to the indoor unit 100 through an online pipe. The indoor unit 100 is generally installed indoors, and the outdoor unit 200 is generally installed outdoors.

[0073] Combine Figure 2 As shown, in an embodiment of the present invention, the air conditioner includes: a refrigerant circulation circuit, through which the refrigerant circulates in a circuit composed of a compressor, a four-way valve, a condenser, a throttling component and an evaporator; also includes a compressor arranged in the outdoor unit 200, and the compressor is used to compress the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas; also includes an outdoor heat exchanger arranged in the outdoor unit 200 and an indoor heat exchanger arranged in the indoor unit 100, wherein one works as a condenser and the other works as an evaporator; also includes a four-way valve arranged in the outdoor unit 200, and the four-way valve is used to control the flow direction of the refrigerant in the refrigerant circulation circuit so that the outdoor heat exchanger and the indoor heat exchanger are switched between the condenser and the evaporator; also includes an outdoor fan in the fan system in the outdoor unit 200, and the outdoor fan is used to supply air to the outdoor heat exchanger.

[0074] Combine Figure 2 As shown, the indoor unit 100 mainly includes an evaporator, and the outdoor unit 200 mainly includes a compressor, a four-way valve, a condenser and a throttling component; Figure 3 As shown, the throttling component includes a throttling device and a solenoid valve, and the throttling component is composed of the throttling device and the solenoid valve in parallel.

[0075] In addition, combined Figure 2 As shown, the outdoor unit 200 also includes a piping system, a three-way stop valve, and a two-way stop valve. The compressor, condenser, throttling component, four-way valve, three-way stop valve, and two-way stop valve in the outdoor unit 200 are connected through the piping system, wherein the piping system includes a C pipe, a D pipe (i.e., an exhaust pipe), an E pipe, and an S pipe (i.e., a return air pipe); the outdoor unit 200 is connected to the indoor unit 100 through a thin connecting pipe and a thick connecting pipe.

[0076] When the air conditioner is in cooling mode, the refrigerant is compressed by the compressor and flows out through the D pipe (i.e., the exhaust pipe) and flows through the four-way valve. At this time, the four-way valve is in the power-off state, and the D pipe (i.e., the exhaust pipe) is connected to the C pipe. The refrigerant flows from the D pipe (i.e., the exhaust pipe) to the C pipe through the four-way valve, and then flows into the condenser. After the refrigerant flows through the flow path of the condenser and dissipates heat under the action of the fan system, it converges and flows into the throttling component. The throttling component is composed of a throttling device and a solenoid valve in parallel. In cooling mode, the solenoid valve is in the closed state. state, the refrigerant flows through the throttling device (the throttling device includes but is not limited to a capillary tube, a throttling valve, and an electronic expansion valve) for throttling treatment. The refrigerant after throttling treatment passes through the two-way stop valve and flows into the indoor unit 100 through the thin connection pipe. After the refrigerant absorbs heat and evaporates in the evaporator, it flows back to the outdoor unit 200 from the three-way stop valve through the thick connection pipe. The refrigerant entering the outdoor unit 200 flows from the E pipe into the four-way valve. At this time, the E pipe is connected to the S pipe (i.e., the return air pipe), and the refrigerant flows from the E pipe into the S pipe (i.e., the return air pipe) and flows back to the compressor to complete the refrigeration cycle.

[0077] When the air conditioner is in heating mode, the refrigerant is compressed by the compressor and flows out through the D pipe (i.e., the exhaust pipe) and flows through the four-way valve. At this time, the four-way valve is in the energized state, and the D pipe (i.e., the exhaust pipe) is connected to the E pipe. The refrigerant flows from the D pipe (i.e., the exhaust pipe) into the E pipe through the four-way valve, and then flows through the thick connecting pipe and flows into the indoor unit 100 from the three-way stop valve. After the refrigerant releases heat and cools in the evaporator, it flows back to the outdoor unit 200 from the two-way stop valve through the thin connecting pipe. The refrigerant entering the outdoor unit 200 flows through the throttling component for throttling treatment, enters the condenser for heat absorption and evaporation, and then flows along the C pipe through the four-way valve. At this time, the C pipe is connected to the S pipe (i.e., the return air pipe). The refrigerant flows from the C pipe into the S pipe (i.e., the return air pipe) and flows back to the compressor to complete the heating cycle.

[0078] It should be noted that when the air conditioner is in cooling mode and non-defrosting action, the solenoid valves in the throttling component are always in a power-off closed state. At this time, the cooling and heating of the air conditioner can be achieved through the throttling effect of the throttling device in the throttling component. When the air conditioner needs to perform a defrosting action, the solenoid valve can be periodically powered on and off and closed under the action of the special control logic of the controller (that is, the defrost control scheme provided by the embodiment of the present invention), thereby achieving short-term periodic defrosting.

[0079] In an embodiment of the present invention, the air conditioner further includes a first temperature sensor, which is used to obtain the outdoor ambient temperature and send the obtained outdoor ambient temperature to the controller so that the controller executes the defrost control scheme provided in the embodiment of the present invention according to the received outdoor ambient temperature.

[0080] In an embodiment of the present invention, the air conditioner further includes a controller, and the controller is configured to control the air conditioner accordingly using the defrost control solution provided in the embodiment of the present invention.

[0081] As one of the optional embodiments, the controller is used to: after the air conditioner is turned on, when it is detected that the air conditioner is in heating mode, obtain the outdoor ambient temperature, record the continuous running time after the air conditioner is turned on, and set the initial value of the number of actions of the solenoid valve to 0; when the outdoor ambient temperature does not reach the first preset temperature, determine whether the number of actions of the solenoid valve is 0; if so, set the continuous running time after the air conditioner is turned on to the whole machine running time after the solenoid valve is powered off and closed, and determine whether the outdoor ambient temperature reaches a second preset temperature; if not, determine whether the outdoor ambient temperature reaches the second preset temperature; when the outdoor ambient temperature does not reach the second preset temperature, compare the whole machine running time after the solenoid valve is powered off and closed with the first preset action cycle; when the whole machine running time after the solenoid valve is powered off and closed reaches the first preset action cycle, control the solenoid valve to be powered on and open and the outdoor fan to stop for defrosting.

[0082] Combine Figure 4 FIG. 1 is a flowchart of a controller for an air conditioner provided by an embodiment of the present invention. When the embodiment of the present invention is implemented, the specific working process of the controller is as follows: After the air conditioner is turned on ( Figure 4 Step S101) first detects the working mode of the air conditioner ( Figure 4 Step S102), if it is detected that the air conditioner is in heating mode ( Figure 4 If the air conditioner is turned on, the first temperature sensor is used to collect the outdoor ambient temperature Tout in real time, and the continuous running time t0 after the air conditioner is turned on is recorded (if it is detected that the air conditioner has performed a regular defrost procedure, t0 is cleared and the recording is restarted), and the initial value of the number of solenoid valve actions N after the power is turned on is set to 0, that is, N=0 ( Figure 4 Then, it is determined whether the outdoor ambient temperature Tout obtained by real-time acquisition reaches the first preset temperature Te1, for example, it is determined whether the outdoor ambient temperature Tout satisfies Tout<Te1( Figure 4 Step S105 is shown); when it is determined that the outdoor ambient temperature Tout obtained by real-time acquisition does not reach the first preset temperature Te1, for example, it is determined that the outdoor ambient temperature Tout satisfies Tout<Te1, and further determines whether the current number of actions N of the solenoid valve is 0, that is, whether N=0( Figure 4If so, that is, it is determined that N = 0, the continuous operation time t0 after the air conditioner is turned on is set to the whole machine operation time ti after the solenoid valve is powered off, that is, let ti = t0 ( Figure 4 Step S107 is shown), and it is further determined whether the outdoor ambient temperature Tout acquired in real time reaches the second preset temperature Te2, for example, whether the outdoor ambient temperature Tout satisfies Tout≤Te2( Figure 4 If not, that is, if N≠0, then it is directly further determined whether the outdoor ambient temperature Tout acquired in real time reaches the second preset temperature Te2 ( Figure 4 (The process jumps from step S106 to step S108); when it is determined that the outdoor ambient temperature Tout acquired in real time does not reach the second preset temperature Te2, for example, it is determined that the outdoor ambient temperature Tout satisfies Tout≤Te2, the whole machine running time ti after the solenoid valve is powered off is compared with the first preset action cycle T1 to determine whether the whole machine running time ti after the solenoid valve is powered off reaches the first preset action cycle T1, for example, it is determined whether the whole machine running time ti after the solenoid valve is powered off satisfies ti≥T1 ( Figure 4 When it is determined that the whole machine operation time ti after the solenoid valve is powered off and closed reaches the first preset action period T1, for example, it is determined that the whole machine operation time ti after the solenoid valve is powered off and closed satisfies ti≥T1, the solenoid valve is controlled to be powered on and opened, and at the same time, the outdoor fan is controlled to stop to defrost the condenser ( Figure 4 Step S110 is shown).

[0083] Understandably, combined Figure 4 As shown, after executing step S102 to detect the working mode of the air conditioner, if it is detected that the air conditioner is in the cooling mode, it is determined that defrosting action is not required, so the solenoid valve does not work and continues to remain in the power-off closed state.

[0084] Understandably, combined Figure 4 As shown, after executing step S105 to determine whether the outdoor ambient temperature Tout satisfies Tout<Te1, if it is determined that the outdoor ambient temperature Tout does not satisfy Tout<Te1, it is determined that defrosting action is not required, so the solenoid valve does not work, the solenoid valve continues to remain in the power-off closed state, and returns to re-execute step S104.

[0085] It should be noted that the first preset temperature Te1 is the rated operating temperature. The outdoor ambient temperature Tout collected in real time is compared with the first preset temperature Te1 in order to determine whether the ambient temperature of the air conditioner (i.e., the outdoor ambient temperature Tout) is higher than the rated operating temperature or lower than the rated operating temperature. Generally speaking, if the outdoor ambient temperature Tout is higher than the rated operating temperature (i.e., Tout≥Te1), frost is not allowed, so there is no need to perform defrosting. However, since the outdoor unit needs to absorb heat from the environment when the air conditioner is heating, after the air conditioner has been working for a period of time, the outdoor ambient temperature Tout may satisfy Tout<Te1. Therefore, it is still necessary to continue to detect the outdoor ambient temperature Tout and make a judgment, that is, return to re-execute step S104.

[0086] It should be noted that when it is determined that the outdoor ambient temperature Tout satisfies Tout<Te1, it indicates that frost may occur on the air conditioner after continuing to work for a period of time. Then, step S106 is further executed to determine whether the current number of actions N of the solenoid valve satisfies N=0. This is to determine whether it is the first time to determine the machine running time after starting up, so as to determine the running time parameters for subsequent judgments.

[0087] Exemplarily, the first preset temperature Te1 can be 7°C. Accordingly, if it is determined that the outdoor ambient temperature Tout satisfies Tout<7°C, step S106 is continued to be executed. If it is determined that the outdoor ambient temperature Tout does not satisfy Tout<7°C, the solenoid valve is controlled to remain in the power-off closed state, and the process returns to step S104. In addition, the first preset temperature Te1 can also be set according to actual needs, and the embodiment of the present invention does not make any specific limitations.

[0088] Exemplarily, the second preset temperature Te2 is lower than the first preset temperature Te1, and the second preset temperature Te2 may be 2°C. Accordingly, if it is determined that the outdoor ambient temperature Tout satisfies Tout≤2°C, step S109 is continued; in addition, the second preset temperature Te2 may also be set according to actual needs, and the embodiment of the present invention does not specifically limit it.

[0089] It should be noted that the first preset action cycle T1 is: when the outdoor ambient temperature Tout satisfies Tout≤Te2, the action cycle of the solenoid valve preset for the air conditioner, and the first preset action cycle T1 is preferably 5 minutes to 20 minutes; illustratively, assuming that the first preset action cycle T1 = 5 minutes, accordingly, if it is determined that the whole machine operation time ti after the solenoid valve is powered off satisfies ti≥5 minutes, then step S110 is continued; in addition, the first preset action cycle T1 can also be set according to matching test data or actual needs, and the embodiment of the present invention does not make specific limitations.

[0090] It should be noted that in the heating mode, after the refrigerant flows through the indoor evaporator for heat exchange, when the solenoid valve is energized and opened, since the channel resistance corresponding to the solenoid valve is much smaller than the channel resistance corresponding to the throttling device, it is equivalent to a short circuit phenomenon in the circuit, that is, the throttling device is short-circuited. Therefore, a large amount of refrigerant will pass through the solenoid valve without being throttled by the throttling device. Therefore, the temperature of the refrigerant flowing into the outdoor condenser through the solenoid valve is similar to the outlet temperature of the indoor evaporator, but higher than the temperature of the outdoor condenser and the ambient temperature in which it is located. Therefore, the frost condensed on the outdoor condenser at this time will absorb heat, melt and evaporate. By performing this defrosting action periodically, the frost can be removed before a large area of ​​frost forms on the outdoor condenser, thereby achieving defrosting of the condenser.

[0091] When the above-mentioned defrost function is implemented, the air conditioner does not shut down and the four-way valve does not reverse. The indoor evaporator continues to release heat to the indoor environment when the air conditioner is defrosting. This overcomes the problem that when the traditional defrost function is implemented, the heating cannot continue due to the reversal of the four-way valve, which brings a poor user experience. At the same time, through periodic non-stop defrosting actions, the outdoor condenser is continuously kept in a frost-free state and the heat exchange effect is kept in the best state. Therefore, the heat exchange performance of the air conditioner can be significantly improved, and the heating capacity can be indirectly increased.

[0092] An air conditioner provided by an embodiment of the present invention includes a refrigerant circulation circuit, which circulates the refrigerant in a circuit composed of a compressor, a four-way valve, a condenser, a throttling component and an evaporator, wherein the throttling component is composed of a throttling device and a solenoid valve in parallel; the air conditioner also includes a compressor for compressing low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas; the air conditioner also includes an outdoor heat exchanger and an indoor heat exchanger, wherein one works for the condenser and the other works for the evaporator; the air conditioner also includes a four-way valve for controlling the flow direction of the refrigerant in the refrigerant circulation circuit so that the outdoor heat exchanger and the indoor heat exchanger are switched between the condenser and the evaporator; the air conditioner also includes an outdoor fan for supplying air to the outdoor heat exchanger; the air conditioner also includes a first temperature sensor for obtaining the outdoor ambient temperature; the air conditioner also includes a controller for: after the air conditioner is turned on, when it is detected that the air conditioner is in heating mode, obtaining the outdoor ambient temperature, recording the continuous running time after the air conditioner is turned on, and setting the initial value of the number of actions of the solenoid valve to 0; when the outdoor ambient temperature is When the temperature does not reach the first preset temperature, it is determined whether the number of actions of the solenoid valve is 0; if so, the continuous running time after the air conditioner is turned on is set to the whole machine running time after the solenoid valve is powered off, and it is determined whether the outdoor ambient temperature reaches the second preset temperature. If not, it is determined whether the outdoor ambient temperature reaches the second preset temperature; when the outdoor ambient temperature does not reach the second preset temperature, the whole machine running time after the solenoid valve is powered off is compared with the first preset action cycle; when the whole machine running time after the solenoid valve is powered off reaches the first preset action cycle, the solenoid valve is controlled to be powered on and the outdoor fan is stopped to perform defrosting; the embodiment of the present invention connects a solenoid valve in parallel at the position of the throttling device, and under the action of special control logic, the air conditioner can achieve defrosting in a low-temperature heating state while still continuing to heat, that is, the air conditioner can achieve defrosting action without stopping the machine, which can effectively improve the energy efficiency of the low-temperature heating capacity, thereby improving the low-temperature heating amount of the air conditioner and improving the user experience.

[0093] As an optional embodiment, the controller is further configured to:

[0094] After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the first preset action cycle, setting the first preset action cycle as a heating and defrosting cycle;

[0095] After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a first preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1;

[0096] Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle;

[0097] When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition;

[0098] When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting;

[0099] After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

[0100] Combine Figure 5 FIG. 1 is another working flow chart of a controller of an air conditioner provided by an embodiment of the present invention. Based on the above embodiment, when the embodiment of the present invention is implemented, the controller executes Figure 4 or Figure 5 Step S109 is shown, and after determining that the whole machine running time ti after the solenoid valve is powered off and closed satisfies ti≥T1, the execution Figure 4 or Figure 5 Before step S110, the first preset action cycle T1 is also set as the heating and defrosting cycle Th, that is, Th=T1( Figure 5 Step S111 shown); the controller executes Figure 4 or Figure 5 After step S110, the system is further configured to start recording the power-on time of the solenoid valve when the solenoid valve is powered on, and periodically determine whether the power-on time of the solenoid valve reaches the first preset time t1. When it is determined that the power-on time of the solenoid valve reaches the first preset time t1 (i.e., after the solenoid valve is powered on for t1), the solenoid valve is controlled to be powered off and closed. At the same time, the outdoor fan is controlled to resume rotation and reach the speed before defrosting ( Figure 5 After completing the above action, immediately record the whole machine running time ti after the electromagnetic valve is powered off and closed, and add 1 to the number of actions N of the electromagnetic valve, that is, let N = N + 1 ( Figure 5 According to the number of solenoid valve actions after adding 1 and the heating defrost cycle Th, the total running time T0 of the air conditioner in the current defrost mode is calculated, where T0 = N*Th ( Figure 5 Step S114 shown); further determine whether the total running time T0 of the air conditioner continuous periodic defrost reaches the preset regular defrost cycle Tc, for example, determine whether the total running time T0 of the air conditioner continuous periodic defrost satisfies T0≥Tc( Figure 5When it is determined that the total running time T0 of the continuous periodic defrosting of the air conditioner reaches the preset regular defrosting period Tc, for example, it is determined that the total running time T0 of the continuous periodic defrosting of the air conditioner satisfies T0≥Tc, it is further determined whether the air conditioner satisfies the preset regular defrosting condition ( Figure 5 When it is determined that the air conditioner meets the preset conventional defrosting conditions, conventional defrosting is performed by executing the conventional defrosting program ( Figure 5 After the conventional defrost is completed, the outdoor ambient temperature Tout is re-acquired, the continuous running time t0 after the air conditioner is turned on is reset and the recording is restarted, and the number of actions N of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature Tout (that is, equivalent to returning to re-execution of step S104), and the cycle is repeated until the user turns off the air conditioner.

[0101] It should be noted that the preset conventional defrost cycle Tc and the preset conventional defrost conditions may be the defrost cycle and defrost conditions set in the defrost scheme provided by the prior art, and may be selected and set according to actual needs, and are not specifically limited in the embodiment of the present invention.

[0102] Among them, the preset regular defrost cycle Tc is preferably 4 hours to 6 hours; for example, assuming that the preset regular defrost cycle Tc = 6 hours, accordingly, if it is determined that the total operating time T0 of the air conditioner for continuous periodic defrosting satisfies T0≥6 hours, then step S116 is continued to be executed; if it is determined that the total operating time T0 of the air conditioner for continuous periodic defrosting does not satisfy T0≥6 hours, then step S105 is returned to be executed; in addition, the preset regular defrost cycle Tc can also be set according to matching test data or actual needs, and the embodiment of the present invention does not make specific limitations.

[0103] It should be noted that when adding 1 to the number of solenoid valve action times N, N=N+1 will only be made after the solenoid valve completes a complete set of actions of power-on opening and power-off closing. That is, one solenoid valve action includes the matching power-on opening action and power-off closing action.

[0104] As an optional embodiment, the controller is further configured to:

[0105] When the whole machine operation time after the solenoid valve is powered off and closed does not reach the first preset action cycle, re-determine whether the number of actions of the solenoid valve is 0, and perform corresponding processing according to the determination result;

[0106] When the total operating time of the air conditioner does not reach the preset regular defrost cycle, re-determining whether the outdoor ambient temperature reaches the first preset temperature, and performing corresponding processing according to the determination result;

[0107] When the air conditioner does not meet the preset normal defrosting condition, it is re-determined whether the outdoor ambient temperature reaches the first preset temperature, and corresponding processing is performed according to the determination result.

[0108] Combine Figure 4 As shown, based on the above embodiment, when the embodiment of the present invention is implemented, the controller executes Figure 4 After step S109 determines whether the whole machine operation time ti after the solenoid valve is powered off and closed satisfies ti≥T1, when it is determined that the whole machine operation time ti after the solenoid valve is powered off and closed does not reach the first preset action cycle T1, for example, it is determined that the whole machine operation time ti after the solenoid valve is powered off and closed does not satisfy ti≥T1, then it is re-determined whether the number of actions N of the solenoid valve is 0, and corresponding processing is performed according to the judgment result (that is, it is equivalent to returning to re-execute step S106 and continuing subsequent processing).

[0109] For example, assuming that the first preset action cycle T1 = 10 minutes, accordingly, if it is determined that the whole machine running time ti after the solenoid valve is powered off and closed satisfies ti≥10 minutes, then continue to execute step S110; if it is determined that the whole machine running time ti after the solenoid valve is powered off and closed does not satisfy ti≥10 minutes, then return to execute step S106.

[0110] Combine Figure 5 As shown, based on the above embodiment, when the embodiment of the present invention is implemented, the controller executes Figure 5 After the step S115 shown determines whether the total running time T0 of the continuous periodic defrost of the air conditioner satisfies T0≥Tc, when it is determined that the total running time T0 of the continuous periodic defrost of the air conditioner does not reach the preset regular defrost cycle Tc, for example, it is determined that the total running time T0 of the continuous periodic defrost of the air conditioner does not satisfy T0≥Tc, it is re-determined whether the outdoor ambient temperature Tout reaches the first preset temperature Te1, and corresponding processing is performed according to the judgment result (that is, it is equivalent to returning to re-execute step S105 and continuing subsequent processing), and the cycle is repeated until the user turns off the power.

[0111] Combine Figure 5 As shown, based on the above embodiment, when the embodiment of the present invention is implemented, the controller executes Figure 5 After step S116 determines whether the air conditioner meets the preset regular defrost conditions, when it is determined that the air conditioner does not meet the preset regular defrost conditions, it re-determines whether the outdoor ambient temperature Tout reaches the first preset temperature Te1, and performs corresponding processing based on the judgment result (that is, it is equivalent to returning to re-execute step S105 and continue subsequent processing), and the cycle continues until the user turns off the power.

[0112] It should be noted that during the operation of the air conditioner in the heating mode, the outdoor ambient temperature Tout is periodically collected by the first temperature sensor, that is, the value of Tout is constantly updated. Therefore, each time the outdoor ambient temperature needs to be compared and judged, the real-time outdoor ambient temperature detected by the first temperature sensor is used.

[0113] As an optional embodiment, the controller is further configured to:

[0114] When the outdoor ambient temperature reaches a second preset temperature, the whole machine operation time after the solenoid valve is powered off is compared with a second preset action cycle; wherein the second preset action cycle is greater than the first preset action cycle;

[0115] When the whole machine operation time after the electromagnetic valve is powered off and closed reaches a second preset action cycle, the electromagnetic valve is controlled to be powered on and opened and the outdoor fan is stopped to perform defrosting processing.

[0116] Combine Figure 6 FIG. 1 is another working flow chart of a controller of an air conditioner provided by an embodiment of the present invention. Based on the above embodiment, when the embodiment of the present invention is implemented, the specific working process of the controller is as follows: After the air conditioner is turned on ( Figure 6 Step S101) first detects the working mode of the air conditioner ( Figure 6 Step S102), if it is detected that the air conditioner is in heating mode ( Figure 6 If the air conditioner is turned on, the first temperature sensor is used to collect the outdoor ambient temperature Tout in real time, and the continuous running time t0 after the air conditioner is turned on is recorded (if it is detected that the air conditioner has performed a regular defrost procedure, t0 is cleared and the recording is restarted), and the initial value of the number of solenoid valve actions N after the power is turned on is set to 0, that is, N=0 ( Figure 6 Then, it is determined whether the outdoor ambient temperature Tout obtained by real-time acquisition reaches the first preset temperature Te1, for example, it is determined whether the outdoor ambient temperature Tout satisfies Tout<Te1( Figure 6 Step S105 is shown); when it is determined that the outdoor ambient temperature Tout obtained by real-time acquisition does not reach the first preset temperature Te1, for example, it is determined that the outdoor ambient temperature Tout satisfies Tout<Te1, and further determines whether the current number of actions N of the solenoid valve is 0, that is, whether N=0( Figure 6If so, that is, it is determined that N = 0, the continuous operation time t0 after the air conditioner is turned on is set to the whole machine operation time ti after the solenoid valve is powered off, that is, let ti = t0 ( Figure 6 Step S107 is shown), and it is further determined whether the outdoor ambient temperature Tout acquired in real time reaches the second preset temperature Te2, for example, whether the outdoor ambient temperature Tout satisfies Tout≤Te2( Figure 6 If not, that is, if N≠0, then it is directly further determined whether the outdoor ambient temperature Tout acquired in real time reaches the second preset temperature Te2 ( Figure 6 (shown as jumping from step S106 to step S108); when it is determined that the outdoor ambient temperature Tout acquired in real time reaches the second preset temperature Te2, for example, it is determined that the outdoor ambient temperature Tout does not satisfy Tout≤Te2, the whole machine running time ti after the solenoid valve is powered off is compared with the second preset action period T2 to determine whether the whole machine running time ti after the solenoid valve is powered off reaches the second preset action period T2, for example, it is determined whether the whole machine running time ti after the solenoid valve is powered off satisfies ti≥T2 ( Figure 6 When it is determined that the whole machine operation time ti after the solenoid valve is powered off and closed reaches the second preset action period T2, for example, it is determined that the whole machine operation time ti after the solenoid valve is powered off and closed satisfies ti≥T2, the solenoid valve is controlled to be powered on and opened, and at the same time, the outdoor fan is controlled to stop to defrost the condenser ( Figure 6 Step S110 is shown).

[0117] Understandably, combined Figure 6 As shown, after executing step S209 to determine whether the whole machine running time ti after the solenoid valve is powered off and closed satisfies ti≥T2, if it is determined that the whole machine running time ti after the solenoid valve is powered off and closed does not satisfy ti≥T2, it is necessary to return to and re-execute step S106.

[0118] It should be noted that the second preset action cycle T2 is: when the outdoor ambient temperature Tout satisfies Te2<Tout<Te1, the action cycle of the solenoid valve preset for the air conditioner, and the second preset action cycle T2 is preferably more than 20 minutes; illustratively, assuming that the second preset action cycle T2=21 minutes, accordingly, if it is determined that the whole machine running time ti after the solenoid valve is powered off and closed satisfies ti≥21 minutes, then continue to execute step S110; if it is determined that the whole machine running time ti after the solenoid valve is powered off and closed does not satisfy ti≥21 minutes, then return to execute step S106; in addition, the second preset action cycle T2 can also be set according to matching test data or actual needs, and the embodiment of the present invention does not make specific limitations.

[0119] It should be noted that, since the possibility of frost of the air conditioner when the outdoor ambient temperature Tout satisfies Tout≤Te2 is much greater than the possibility of frost of the air conditioner when the outdoor ambient temperature Tout satisfies Te2<Tout<Te1, the frost speed of the air conditioner when the outdoor ambient temperature Tout satisfies Tout≤Te2 is much faster than the frost speed of the air conditioner when the outdoor ambient temperature Tout satisfies Te2<Tout<Te1. Therefore, the action cycles of the solenoid valve in the two cases are inconsistent, and it is necessary to satisfy that the second preset action cycle T2 is greater than the first preset action cycle T1.

[0120] As an optional embodiment, the controller is further configured to:

[0121] After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the second preset action cycle, setting the second preset action cycle as a heating and defrosting cycle;

[0122] After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a second preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1;

[0123] Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle;

[0124] When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition;

[0125] When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting;

[0126] After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

[0127] Combine Figure 7 As shown in FIG. 1 , another working flow chart of an air conditioner controller provided by an embodiment of the present invention is shown. Based on the above embodiment, when the embodiment of the present invention is implemented, the controller executes Figure 6 or Figure 7 Step S209 is shown, and after determining that the whole machine running time ti after the solenoid valve is powered off and closed satisfies ti≥T2, the execution Figure 6 or Figure 7Before step S110, the second preset action cycle T2 is also set as the heating and defrosting cycle Th, that is, Th=T2( Figure 7 Step S211 shown); the controller executes Figure 6 or Figure 7 After step S110, the system is further configured to start recording the power-on time of the solenoid valve when the solenoid valve is powered on, and periodically determine whether the power-on time of the solenoid valve reaches the second preset time t2. When it is determined that the power-on time of the solenoid valve reaches the second preset time t2 (i.e., after the solenoid valve is powered on for t2), the solenoid valve is controlled to be powered off and closed. At the same time, the outdoor fan is controlled to resume rotation and reach the speed before defrosting ( Figure 7 After completing the above action, immediately record the whole machine running time ti after the electromagnetic valve is powered off and closed, and add 1 to the number of actions N of the electromagnetic valve, that is, let N = N + 1 ( Figure 7 According to the number of solenoid valve actions after adding 1 and the heating defrost cycle Th, the total running time T0 of the air conditioner in the current defrost mode is calculated, where T0 = N*Th ( Figure 7 Step S114 shown); further determine whether the total running time T0 of the air conditioner continuous periodic defrost reaches the preset regular defrost cycle Tc, for example, determine whether the total running time T0 of the air conditioner continuous periodic defrost satisfies T0≥Tc( Figure 7 When it is determined that the total running time T0 of the continuous periodic defrosting of the air conditioner reaches the preset regular defrosting period Tc, for example, it is determined that the total running time T0 of the continuous periodic defrosting of the air conditioner satisfies T0≥Tc, it is further determined whether the air conditioner satisfies the preset regular defrosting condition ( Figure 7 When it is determined that the air conditioner meets the preset conventional defrosting conditions, conventional defrosting is performed by executing the conventional defrosting program ( Figure 7 After the conventional defrost is completed, the outdoor ambient temperature Tout is re-acquired, the continuous running time t0 after the air conditioner is turned on is reset and the recording is restarted, and the number of actions N of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature Tout (that is, equivalent to returning to re-execution of step S104), and the cycle is repeated until the user turns off the air conditioner.

[0128] It should be noted that the first preset time t1 in the above embodiment and the second preset time t2 in this embodiment are both the duration of the solenoid valve being open when powered on, which are generally preset parameters of the air conditioner and can be set according to actual test data, and it is necessary to satisfy that the first preset time t1 is greater than or equal to the second preset time t2; since the throttling device does not have a throttling effect when the solenoid valve is powered on and open, if the duration is too long, it may cause damage to the compressor. Therefore, the first preset time t1 and the second preset time t2 should not be set too long. The first preset time t1 is preferably less than 1 minute, and the second preset time t2 is preferably less than 1 minute.

[0129] The embodiment of the present invention also provides a defrosting control method for an air conditioner, see Figure 8 FIG. 1 is a flow chart of a defrost control method for an air conditioner provided by an embodiment of the present invention. The method is applicable to the air conditioner described in any of the above embodiments. The method is executed by the controller and includes steps S11 to S15:

[0130] Step S11, after the air conditioner is turned on, when it is detected that the air conditioner is in heating mode, obtaining the outdoor ambient temperature, recording the continuous operation time after the air conditioner is turned on, and setting the initial value of the number of operations of the solenoid valve to 0;

[0131] Step S12: When the outdoor ambient temperature does not reach the first preset temperature, determining whether the number of operations of the solenoid valve is 0;

[0132] Step S13: If yes, then set the continuous running time of the air conditioner after it is turned on as the whole machine running time after the solenoid valve is powered off, and determine whether the outdoor ambient temperature reaches a second preset temperature; if not, then determine whether the outdoor ambient temperature reaches the second preset temperature;

[0133] Step S14: When the outdoor ambient temperature does not reach the second preset temperature, the whole machine operation time after the solenoid valve is powered off is compared with the first preset operation cycle;

[0134] Step S15: When the entire machine operation time after the solenoid valve is powered off and closed reaches a first preset operation cycle, the solenoid valve is controlled to be powered on and open and the outdoor fan is stopped to perform defrosting.

[0135] In a specific implementation of the embodiment of the present invention, after the air conditioner is turned on, the controller first detects the working mode of the air conditioner. If it is detected that the air conditioner is in the heating mode, it is determined that a defrosting action may be required, and it is necessary to further confirm whether the defrosting conditions are met. Furthermore, the outdoor ambient temperature Tout is acquired in real time by the first temperature sensor, and at the same time, the continuous running time t0 after the air conditioner is turned on is recorded (if it is detected that the air conditioner has performed a regular defrosting procedure, t0 is cleared and recording is restarted), and the initial value of the number of actions N of the solenoid valve after startup is set to 0, that is, let N=0; then, it is determined whether the outdoor ambient temperature Tout acquired in real time reaches the first preset temperature Te1, for example, it is determined whether the outdoor ambient temperature Tout satisfies Tout<Te1; when it is determined that the outdoor ambient temperature Tout acquired in real time does not reach the first preset temperature Te1, for example, it is determined that the outdoor ambient temperature Tout satisfies Tout<Te1, it is further determined whether the current number of actions N of the solenoid valve is 0, that is, it is determined whether N=0; if so, that is, it is determined that N=0, the continuous running time t0 after the air conditioner is turned on is set as the solenoid valve. The whole machine running time after power failure is ti, that is, let ti = t0, and further determine whether the outdoor ambient temperature Tout obtained by real-time acquisition reaches the second preset temperature Te2, for example, determine whether the outdoor ambient temperature Tout satisfies Tout≤Te2. If not, that is, determine N≠0, then directly further determine whether the outdoor ambient temperature Tout obtained by real-time acquisition reaches the second preset temperature Te2; when it is determined that the outdoor ambient temperature Tout obtained by real-time acquisition does not reach the second preset temperature Te2, for example, determine that the outdoor ambient temperature Tout satisfies Tout≤Te2, The whole machine operation time ti after the solenoid valve is powered off and closed is compared with the first preset action cycle T1 to determine whether the whole machine operation time ti after the solenoid valve is powered off and closed reaches the first preset action cycle T1, for example, determine whether the whole machine operation time ti after the solenoid valve is powered off and closed satisfies ti≥T1; when it is determined that the whole machine operation time ti after the solenoid valve is powered off and closed reaches the first preset action cycle T1, for example, it is determined that the whole machine operation time ti after the solenoid valve is powered off and closed satisfies ti≥T1, the solenoid valve is controlled to be powered on and opened, and at the same time, the outdoor fan is controlled to stop to defrost the condenser.

[0136] It should be noted that in the heating mode, after the refrigerant flows through the indoor evaporator for heat exchange, when the solenoid valve is energized and opened, since the channel resistance corresponding to the solenoid valve is much smaller than the channel resistance corresponding to the throttling device, it is equivalent to a short circuit phenomenon in the circuit, that is, the throttling device is short-circuited. Therefore, a large amount of refrigerant will pass through the solenoid valve without being throttled by the throttling device. Therefore, the temperature of the refrigerant flowing into the outdoor condenser through the solenoid valve is similar to the outlet temperature of the indoor evaporator, but higher than the temperature of the outdoor condenser and the ambient temperature in which it is located. Therefore, the frost condensed on the outdoor condenser at this time will absorb heat, melt and evaporate. By performing this defrosting action periodically, the frost can be removed before a large area of ​​frost forms on the outdoor condenser, thereby achieving defrosting of the condenser.

[0137] When the above-mentioned defrost function is implemented, the air conditioner does not shut down and the four-way valve does not reverse. The indoor evaporator continues to release heat to the indoor environment when the air conditioner is defrosting. This overcomes the problem that when the traditional defrost function is implemented, the heating cannot continue due to the reversal of the four-way valve, which brings a poor user experience. At the same time, through periodic non-stop defrosting actions, the outdoor condenser is continuously kept in a frost-free state and the heat exchange effect is kept in the best state. Therefore, the heat exchange performance of the air conditioner can be significantly improved, and the heating capacity can be indirectly increased.

[0138] See also Figure 9 FIG. 1 is another flow chart of a defrost control method for an air conditioner provided by an embodiment of the present invention. In some embodiments, the method further includes steps S16 to S21:

[0139] Step S16: after determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the first preset operation cycle, setting the first preset operation cycle as a heating and defrosting cycle;

[0140] Step S17: After the solenoid valve is powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a first preset time, the solenoid valve is powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1;

[0141] Step S18: Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle;

[0142] Step S19: When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition;

[0143] Step S20: When the air conditioner meets the preset normal defrosting conditions, perform normal defrosting;

[0144] Step S21: After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and the recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

[0145] Specifically, in combination with the above embodiment, after determining that the whole machine running time ti after the solenoid valve is powered off and closed satisfies ti≥T1, before controlling the solenoid valve to be powered on and the outdoor fan to be stopped, the controller sets the first preset action cycle T1 to the heating and defrosting cycle Th, that is, let Th=T1; after controlling the solenoid valve to be powered on and the outdoor fan to be stopped, the controller starts to record the power-on time of the solenoid valve when the solenoid valve is powered on and opened, and periodically determines whether the power-on time of the solenoid valve reaches the first preset time t1. When it is determined that the power-on time of the solenoid valve reaches the first preset time t1 (that is, after the solenoid valve is powered on and runs for t1 time), the solenoid valve is controlled to be powered off and closed, and at the same time, the outdoor fan is controlled to resume rotation and reach the speed before defrosting; after completing the above action, the controller immediately records the whole machine running time ti after the solenoid valve is powered off and closed, and adds 1 to the number of actions N of the solenoid valve, that is, let N=N+1; the number of actions of the solenoid valve after the addition of 1 and the heating and defrosting cycle Th is calculated to obtain The total running time T0 of the continuous periodic defrost of the air conditioner in the current defrost mode is obtained, wherein T0=N*Th; whether the total running time T0 of the continuous periodic defrost of the air conditioner reaches the preset conventional defrost cycle Tc is further determined, for example, whether the total running time T0 of the continuous periodic defrost of the air conditioner satisfies T0≥Tc. When it is determined that the total running time T0 of the continuous periodic defrost of the air conditioner reaches the preset conventional defrost cycle Tc, for example, it is determined that the total running time T0 of the continuous periodic defrost of the air conditioner satisfies T0≥Tc, it is further determined whether the air conditioner satisfies the preset conventional defrost condition; when it is determined that the air conditioner satisfies the preset conventional defrost condition, conventional defrost is performed by executing the conventional defrost program; after the conventional defrost is completed, the outdoor ambient temperature Tout is continued to be reacquired, the continuous running time t0 after the air conditioner is turned on is reset and the recording is restarted, the number of actions N of the solenoid valve is reset to perform corresponding processing according to the reacquired outdoor ambient temperature Tout, and this cycle is repeated until the user turns off the air conditioner.

[0146] In some embodiments, the method further comprises:

[0147] When the whole machine operation time after the solenoid valve is powered off and closed does not reach the first preset action cycle, re-determine whether the number of actions of the solenoid valve is 0, and perform corresponding processing according to the determination result;

[0148] When the total operating time of the air conditioner does not reach the preset regular defrost cycle, re-determining whether the outdoor ambient temperature reaches the first preset temperature, and performing corresponding processing according to the determination result;

[0149] When the air conditioner does not meet the preset normal defrosting condition, it is re-determined whether the outdoor ambient temperature reaches the first preset temperature, and corresponding processing is performed according to the determination result.

[0150] See also Figure 10 FIG. 1 is another flow chart of a defrost control method for an air conditioner provided by an embodiment of the present invention. In some embodiments, the method further includes steps S22 to S23:

[0151] Step S22: When the outdoor ambient temperature reaches a second preset temperature, the whole machine operation time after the solenoid valve is powered off is compared with a second preset operation cycle; wherein the second preset operation cycle is greater than the first preset operation cycle;

[0152] Step S23: When the whole machine operation time after the solenoid valve is powered off and closed reaches a second preset action cycle, the solenoid valve is controlled to be powered on and open and the outdoor fan is stopped to perform defrosting.

[0153] Specifically, in combination with the above embodiment, after the air conditioner is turned on, the controller first detects the working mode of the air conditioner. If it is detected that the air conditioner is in the heating mode, it is determined that a defrosting action may be required, and it is necessary to further confirm whether the defrosting condition is met. Furthermore, the outdoor ambient temperature Tout is acquired in real time by the first temperature sensor, and at the same time, the continuous running time t0 after the air conditioner is turned on is recorded (if it is detected that the air conditioner has performed a regular defrosting procedure, t0 is cleared and recording is restarted), and the initial value of the number of actions N of the solenoid valve after startup is set to 0, that is, let N=0; then, it is determined whether the outdoor ambient temperature Tout acquired in real time reaches the first preset temperature Te1, for example, it is determined whether the outdoor ambient temperature Tout satisfies Tout<Te1; when it is determined that the outdoor ambient temperature Tout acquired in real time does not reach the first preset temperature Te1, for example, it is determined that the outdoor ambient temperature Tout satisfies Tout<Te1, it is further determined whether the current number of actions N of the solenoid valve is 0, that is, it is determined whether N=0; if so, that is, it is determined that N=0, the continuous running time t0 after the air conditioner is turned on is set as the solenoid valve The whole machine running time after power failure is ti, that is, let ti = t0, and further determine whether the outdoor ambient temperature Tout obtained by real-time acquisition reaches the second preset temperature Te2, for example, determine whether the outdoor ambient temperature Tout satisfies Tout≤Te2. If not, that is, determine N≠0, then directly further determine whether the outdoor ambient temperature Tout obtained by real-time acquisition reaches the second preset temperature Te2; when it is determined that the outdoor ambient temperature Tout obtained by real-time acquisition reaches the second preset temperature Te2, for example, determine that the outdoor ambient temperature Tout does not satisfy Tout≤Te2, The whole machine operation time ti after the solenoid valve is powered off and closed is compared with the second preset action cycle T2 to determine whether the whole machine operation time ti after the solenoid valve is powered off and closed reaches the second preset action cycle T2, for example, determine whether the whole machine operation time ti after the solenoid valve is powered off and closed satisfies ti≥T2; when it is determined that the whole machine operation time ti after the solenoid valve is powered off and closed reaches the second preset action cycle T2, for example, it is determined that the whole machine operation time ti after the solenoid valve is powered off and closed satisfies ti≥T2, the solenoid valve is controlled to be powered on and opened, and at the same time, the outdoor fan is controlled to stop to defrost the condenser.

[0154] In some embodiments, the method further comprises:

[0155] After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the second preset action cycle, setting the second preset action cycle as a heating and defrosting cycle;

[0156] After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a second preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1;

[0157] Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle;

[0158] When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition;

[0159] When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting;

[0160] After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

[0161] Specifically, in combination with the above embodiment, after determining that the whole machine running time ti after the solenoid valve is powered off and closed satisfies ti≥T2, before controlling the solenoid valve to be powered on and the outdoor fan to be stopped, the controller sets the second preset action cycle T2 to the heating and defrosting cycle Th, that is, let Th=T2; after controlling the solenoid valve to be powered on and the outdoor fan to be stopped, the controller starts to record the power-on time of the solenoid valve when the solenoid valve is powered on and opened, and periodically determines whether the power-on time of the solenoid valve reaches the second preset time t2. When it is determined that the power-on time of the solenoid valve reaches the second preset time t2 (that is, after the solenoid valve is powered on and runs for t2 time), the solenoid valve is controlled to be powered off and closed, and at the same time, the outdoor fan is controlled to resume rotation and reach the speed before defrosting; immediately after completing the above action, the whole machine running time ti after the solenoid valve is powered off and closed is recorded, and the number of actions N of the solenoid valve is added by 1, that is, let N=N+1; the number of actions of the solenoid valve after the addition of 1 and the heating and defrosting cycle Th is calculated to obtain The total running time T0 of the continuous periodic defrost of the air conditioner in the current defrost mode is continuously periodically defrosted, where T0=N*Th; further determine whether the total running time T0 of the continuous periodic defrost of the air conditioner reaches the preset conventional defrost cycle Tc, for example, determine whether the total running time T0 of the continuous periodic defrost of the air conditioner satisfies T0≥Tc. When it is determined that the total running time T0 of the continuous periodic defrost of the air conditioner reaches the preset conventional defrost cycle Tc, for example, determine that the total running time T0 of the continuous periodic defrost of the air conditioner satisfies T0≥Tc, further determine whether the air conditioner meets the preset conventional defrost condition; when it is determined that the air conditioner meets the preset conventional defrost condition, perform conventional defrost by executing the conventional defrost program; after the conventional defrost is completed, continue to re-acquire the outdoor ambient temperature Tout, reset the continuous running time t0 after the air conditioner is turned on and restart recording, reset the number of actions N of the solenoid valve to perform corresponding processing according to the re-acquired outdoor ambient temperature Tout, and repeat this cycle until the user turns off the air conditioner.

[0162] It should be noted that the defrost control method for an air conditioner provided in an embodiment of the present invention can realize all the working processes of the air conditioner described in any of the above embodiments. The specific implementation plan and the technical effects achieved corresponding to the defrost control method are respectively the same as the specific implementation plan and the technical effects achieved of the air conditioner described in the above embodiments, and will not be repeated here.

[0163] In summary, an embodiment of the present invention provides an air conditioner and a defrost control method for an air conditioner, wherein the air conditioner includes a refrigerant circulation circuit, wherein the refrigerant circulates in a circuit consisting of a compressor, a four-way valve, a condenser, a throttling component and an evaporator, wherein the throttling component is composed of a throttling device and a solenoid valve in parallel; the air conditioner also includes a compressor for compressing low-temperature, low-pressure refrigerant gas into high-temperature, high-pressure refrigerant gas; the air conditioner also includes an outdoor heat exchanger and an indoor heat exchanger, wherein one works for the condenser and the other works for the evaporator; the air conditioner also includes a four-way valve for controlling the flow direction of the refrigerant in the refrigerant circulation circuit so that the outdoor heat exchanger and the indoor heat exchanger are switched between serving as a condenser and an evaporator; the air conditioner also includes an outdoor fan for supplying air to the outdoor heat exchanger; the air conditioner also includes a first temperature sensor for obtaining the outdoor ambient temperature; the air conditioner also includes a controller for: after the air conditioner is turned on, when it is detected that the air conditioner is in heating mode, obtaining the outdoor ambient temperature, recording the continuous running time after the air conditioner is turned on, and initializing the number of actions of the solenoid valve. The value is set to 0; when the outdoor ambient temperature does not reach the first preset temperature, it is determined whether the number of actions of the solenoid valve is 0; if so, the continuous running time after the air conditioner is turned on is set to the whole machine running time after the solenoid valve is powered off, and it is determined whether the outdoor ambient temperature reaches the second preset temperature. If not, it is determined whether the outdoor ambient temperature reaches the second preset temperature; when the outdoor ambient temperature does not reach the second preset temperature, the whole machine running time after the solenoid valve is powered off is compared with the first preset action cycle; when the whole machine running time after the solenoid valve is powered off reaches the first preset action cycle, the solenoid valve is controlled to be powered on and the outdoor fan is stopped to perform defrosting. The embodiment of the present invention connects a solenoid valve in parallel at the position of the throttling device. Under the action of special control logic, the air conditioner can achieve defrosting in a low-temperature heating state while still continuing to heat, that is, the air conditioner can achieve defrosting without stopping, which can effectively improve the energy efficiency of low-temperature heating capacity, thereby improving the low-temperature heating amount of the air conditioner and improving the user experience.

[0164] The above are only some embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An air conditioner, characterized in that: include: The refrigerant circulation circuit circulates the refrigerant in a circuit consisting of a compressor, a four-way valve, a condenser, a throttling component and an evaporator, wherein the throttling component is composed of a throttling device and a solenoid valve connected in parallel; Compressor, used to compress low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure refrigerant gas; An outdoor heat exchanger and an indoor heat exchanger, wherein one works as a condenser and the other works as an evaporator; A four-way valve is used to control the flow direction of the refrigerant in the refrigerant circulation loop so that the outdoor heat exchanger and the indoor heat exchanger are switched between serving as a condenser and an evaporator; Outdoor fan, used to supply air to the outdoor heat exchanger; A first temperature sensor is used to obtain the outdoor ambient temperature; The controller is used to: after the air conditioner is turned on, when it is detected that the air conditioner is in heating mode, obtain the outdoor ambient temperature, record the continuous running time after the air conditioner is turned on, and set the initial value of the number of actions of the solenoid valve to 0; when the outdoor ambient temperature does not reach the first preset temperature, determine whether the number of actions of the solenoid valve is 0; if so, set the continuous running time after the air conditioner is turned on as the whole machine running time after the solenoid valve is powered off and closed, and determine whether the outdoor ambient temperature reaches the second preset temperature; if not, determine whether the outdoor ambient temperature reaches the second preset temperature; when the outdoor ambient temperature does not reach the second preset temperature, compare the whole machine running time after the solenoid valve is powered off and closed with the first preset action cycle; when the whole machine running time after the solenoid valve is powered off and closed reaches the first preset action cycle, control the solenoid valve to be powered on and open and the outdoor fan to stop for defrosting.

2. The air conditioner according to claim 1, wherein The controller is also used to: After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the first preset action cycle, setting the first preset action cycle as a heating and defrosting cycle; After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a first preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1; Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle; When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition; When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting; After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

3. The air conditioner according to claim 2, wherein: The controller is also used to: When the whole machine operation time after the solenoid valve is powered off and closed does not reach the first preset action cycle, re-determine whether the number of actions of the solenoid valve is 0, and perform corresponding processing according to the determination result; When the total operating time of the air conditioner does not reach the preset regular defrost cycle, re-determining whether the outdoor ambient temperature reaches the first preset temperature, and performing corresponding processing according to the determination result; When the air conditioner does not meet the preset normal defrosting condition, it is re-determined whether the outdoor ambient temperature reaches the first preset temperature, and corresponding processing is performed according to the determination result.

4. The air conditioner according to claim 1, wherein The controller is also used to: When the outdoor ambient temperature reaches a second preset temperature, the whole machine operation time after the solenoid valve is powered off is compared with a second preset action cycle; wherein the second preset action cycle is greater than the first preset action cycle; When the whole machine operation time after the electromagnetic valve is powered off and closed reaches a second preset action cycle, the electromagnetic valve is controlled to be powered on and opened and the outdoor fan is stopped to perform defrosting processing.

5. The air conditioner according to claim 4, wherein: The controller is also used to: After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the second preset action cycle, setting the second preset action cycle as a heating and defrosting cycle; After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a second preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1; Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle; When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition; When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting; After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

6. A defrost control method for an air conditioner, characterized in that: Applicable to the air conditioner according to any one of claims 1 to 5, the method is executed by the controller, and the method includes: After the air conditioner is turned on, when it is detected that the air conditioner is in a heating mode, the outdoor ambient temperature is obtained, the continuous operation time after the air conditioner is turned on is recorded, and the initial value of the number of operations of the solenoid valve is set to 0; When the outdoor ambient temperature does not reach the first preset temperature, determining whether the number of operations of the solenoid valve is 0; If so, the continuous running time after the air conditioner is turned on is set as the whole machine running time after the solenoid valve is powered off, and it is determined whether the outdoor ambient temperature reaches the second preset temperature; if not, it is determined whether the outdoor ambient temperature reaches the second preset temperature; When the outdoor ambient temperature does not reach the second preset temperature, the whole machine operation time after the solenoid valve is powered off is compared with the first preset action cycle; When the whole machine operation time after the electromagnetic valve is powered off and closed reaches a first preset action cycle, the electromagnetic valve is controlled to be powered on and opened and the outdoor fan is stopped to perform defrosting processing.

7. The defrost control method for an air conditioner according to claim 6, wherein: The method further comprises: After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the first preset action cycle, setting the first preset action cycle as a heating and defrosting cycle; After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a first preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1; Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle; When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition; When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting; After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

8. The defrost control method for an air conditioner according to claim 7, wherein: The method further comprises: When the whole machine operation time after the solenoid valve is powered off and closed does not reach the first preset action cycle, re-determine whether the number of actions of the solenoid valve is 0, and perform corresponding processing according to the determination result; When the total operating time of the air conditioner does not reach the preset regular defrost cycle, re-determining whether the outdoor ambient temperature reaches the first preset temperature, and performing corresponding processing according to the determination result; When the air conditioner does not meet the preset normal defrosting condition, it is re-determined whether the outdoor ambient temperature reaches the first preset temperature, and corresponding processing is performed according to the determination result.

9. The defrost control method for an air conditioner according to claim 6, wherein: The method further comprises: When the outdoor ambient temperature reaches a second preset temperature, the whole machine operation time after the solenoid valve is powered off is compared with a second preset action cycle; wherein the second preset action cycle is greater than the first preset action cycle; When the whole machine operation time after the electromagnetic valve is powered off and closed reaches a second preset action cycle, the electromagnetic valve is controlled to be powered on and opened and the outdoor fan is stopped to perform defrosting processing.

10. The defrost control method for an air conditioner according to claim 9, wherein: The method further comprises: After determining that the entire machine operation time after the solenoid valve is powered off and closed reaches the second preset action cycle, setting the second preset action cycle as a heating and defrosting cycle; After the solenoid valve is controlled to be powered on and the outdoor fan is stopped, when the power-on time of the solenoid valve reaches a second preset time, the solenoid valve is controlled to be powered off and closed, and the outdoor fan is restored to the speed before defrosting, the whole machine running time after the solenoid valve is powered off and closed is recorded, and the number of operations of the solenoid valve is increased by 1; Calculate the total operating time of the air conditioner according to the number of operations of the solenoid valve and the heating and defrosting cycle; When the total operating time of the air conditioner reaches a preset normal defrost cycle, determining whether the air conditioner meets the preset normal defrost condition; When the air conditioner meets the preset normal defrosting conditions, performing normal defrosting; After conventional defrosting is completed, the outdoor ambient temperature is re-acquired, the continuous running time after the air conditioner is turned on is reset and recording is restarted, and the number of actions of the solenoid valve is reset to perform corresponding processing according to the re-acquired outdoor ambient temperature.

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