Air conditioner and fresh air control method thereof

Abstract

The present invention discloses an air conditioner and a fresh air control method thereof. The air conditioner comprises: a refrigeration system, a fresh air system, a fresh air regulating system, a first temperature sensor, and a second temperature sensor. A controller is configured to: obtain an operation mode of the air conditioner; after determining that the fresh air system is continuously turned on for a first preset time, based on the operation mode, control the solenoid valve and the electronic expansion valve according to the first temperature, so that the fresh air regulating system is turned on and operated to control the second temperature, thereby avoiding condensation water on the inner surface or outer surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances.

Description

Technical Field

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

[0002] In summer, when the outdoor temperature is high and the humidity is high, the air conditioner is running for cooling or dehumidification. If the fresh air system is turned on, the outer surface temperature of the indoor part of the fresh air duct is lower than the inner surface temperature of the fresh air duct. Condensation water is easily generated on the inner surface of the fresh air duct, resulting in an increase in condensation water in the fresh air duct when the fresh air system is running for a long time, which is easy to breed bacteria and odor, affecting human comfort and health; in addition, when the fresh air blows through the water in the fresh air duct, it is easy to produce gurgling noises due to excessive water accumulation. In winter, when the air conditioner is running for heating, if the fresh air system is turned on, the inner surface temperature of the indoor part of the fresh air duct is lower than the outer surface temperature of the fresh air duct, which is easy to produce condensation water on the outer surface of the fresh air duct. Condensation water dripping down will cause damage to indoor walls and electrical appliances. Therefore, when the fresh air system is running, how to reduce condensation water is an urgent problem to be solved. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the purpose of the present invention is to provide an air conditioner and a fresh air control method thereof.

[0004] An air conditioner proposed by the present invention comprises: a refrigeration system, wherein the positions of the suction and exhaust pipes in the refrigeration cycle system are swapped so as to utilize the evaporator to heat the indoor air so as to realize the heating operation of the air conditioner, wherein the refrigeration system comprises a compressor, and the compressor is used to compress the low-temperature and low-pressure refrigerant gas into the high-temperature and high-pressure refrigerant gas and discharge it to the condenser; a fresh air system, wherein the fresh air system comprises a fresh air inlet, a fresh air inlet filter, a fresh air motor, a fresh air fan, a fresh air outlet and a fresh air outlet filter, and the fresh air system is used to supply air to the room for ventilation; a fresh air conditioning system, wherein the fresh air conditioning system comprises a fresh air heat exchanger, a fresh air An air duct, a solenoid valve and an electronic expansion valve, the fresh air regulating system is used to regulate the temperature of the fresh air outlet; a first temperature sensor is arranged at the fresh air inlet, and is used to obtain a first temperature of the fresh air inlet; a second temperature sensor is arranged at the fresh air outlet, and is used to obtain a second temperature of the fresh air outlet; the controller is configured to: obtain the operating mode of the air conditioner; after determining that the fresh air system is continuously turned on for a first preset time, based on the operating mode, control the solenoid valve and the electronic expansion valve according to the first temperature, so that the fresh air regulating system is turned on and operated to control the second temperature.

[0005] In addition, the air conditioner according to the embodiment of the present invention may also have the following additional technical features:

[0006] Further, when the solenoid valve and the electronic expansion valve are controlled according to the first temperature based on the operating mode so that the fresh air conditioning system is started and operated, the controller is specifically configured as follows: when the air conditioner is in cooling mode, determine the first dew point temperature of the inner surface of the fresh air duct; determine whether the first temperature exceeds the first dew point temperature; when the first temperature exceeds the first dew point temperature, control the solenoid valve and the electronic expansion valve to open to reduce the second temperature until the second temperature is less than the first dew point temperature; when the first temperature does not exceed the first dew point temperature, control the solenoid valve and the electronic expansion valve not to open.

[0007] Further, when the first temperature exceeds the first dew point temperature, the solenoid valve and the electronic expansion valve are controlled to open to lower the second temperature until the second temperature is less than the first dew point temperature. The controller is specifically configured to: after the first temperature does not exceed the first dew point temperature and lasts for a second preset time, control the solenoid valve and the electronic expansion valve to close.

[0008] Furthermore, the air conditioner also includes a third temperature sensor and a first humidity sensor, wherein the third temperature sensor is used to obtain the indoor ambient temperature, and the first humidity sensor is used to obtain the outdoor ambient humidity. When the air conditioner is in cooling mode and determines the first dew point temperature of the inner surface of the fresh air duct, the controller is specifically configured to: obtain the indoor ambient temperature and the outdoor ambient humidity; and determine the first dew point temperature by querying a pre-calibrated first temperature and humidity mapping table according to the indoor ambient temperature and the outdoor ambient humidity.

[0009] Further, the controller is specifically configured to: when the air conditioner exits the cooling mode, control the air conditioner to operate in heating mode, and control the solenoid valve and the electronic expansion valve to be closed after being opened for a third preset time.

[0010] Further, when the solenoid valve and the electronic expansion valve are controlled according to the first temperature based on the operating mode so that the fresh air conditioning system is turned on and operated, the controller is specifically configured as follows: when the air conditioner is in heating mode, determine the second dew point temperature of the outer surface of the fresh air duct; determine whether the first temperature exceeds the second dew point temperature; when the first temperature does not exceed the second dew point temperature, control the solenoid valve and the electronic expansion valve to open to increase the second temperature until the second temperature is greater than the second dew point temperature; when the first temperature exceeds the second dew point temperature, control the solenoid valve and the electronic expansion valve not to open.

[0011] Further, when the first temperature does not exceed the second dew point temperature, the solenoid valve and the electronic expansion valve are controlled to open to increase the second temperature until the second temperature is greater than the second dew point temperature. The controller is specifically configured to: after the second temperature exceeds the second dew point temperature and lasts for a second preset time, control the solenoid valve and the electronic expansion valve to close.

[0012] Furthermore, the air conditioner also includes a fourth temperature sensor and a second humidity sensor, wherein the fourth temperature sensor is used to obtain indoor ambient humidity, and the second humidity sensor is used to obtain outdoor ambient temperature. When the air conditioner is in heating mode and determines the second dew point temperature of the outer surface of the fresh air duct, the controller is specifically configured to: obtain the indoor ambient humidity and the outdoor ambient temperature; and determine the second dew point temperature by querying a pre-calibrated second temperature and humidity mapping table according to the indoor ambient humidity and the outdoor ambient temperature.

[0013] According to the air conditioner of the embodiment of the present invention, after determining that the fresh air system is continuously turned on for the first preset time, the solenoid valve and the electronic expansion valve are controlled according to the operation mode of the air conditioner and the first temperature, so that the fresh air adjustment system is turned on and operated to control the second temperature, which can avoid the formation of condensation water on the inner surface or outer surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances. Further, when the air conditioner refrigeration ends, the fresh air adjustment system is controlled to enter the mildew-proof operation mode, which can prevent the fresh air duct from breeding mildew, and avoid the mildew in the fresh air duct from endangering human health when the fresh air system is turned on next time.

[0014] In response to the above-mentioned problems, the present invention also proposes a fresh air control method for an air conditioner, which is used for an air conditioner as described in any of the above embodiments, and the method comprises the following steps: obtaining the operating mode of the air conditioner; after determining that the fresh air system is continuously turned on for a first preset time, based on the operating mode, controlling the solenoid valve and the electronic expansion valve according to the first temperature, so that the fresh air regulation system is turned on and operated to control the second temperature.

[0015] In addition, the fresh air control method for the air conditioner according to the embodiment of the present invention may also have the following additional technical features:

[0016] Further, based on the operating mode, the solenoid valve and the electronic expansion valve are controlled according to the first temperature so that the fresh air conditioning system is started and operated, including: when the air conditioner is in cooling mode, determining the first dew point temperature of the inner surface of the fresh air duct; judging whether the first temperature exceeds the first dew point temperature; when the first temperature exceeds the first dew point temperature, controlling the solenoid valve and the electronic expansion valve to open to reduce the second temperature until the second temperature is less than the first dew point temperature; when the first temperature does not exceed the first dew point temperature, controlling the solenoid valve and the electronic expansion valve not to open.

[0017] According to the fresh air control method of the air conditioner of the embodiment of the present invention, after determining that the fresh air system is continuously turned on for the first preset time, the solenoid valve and the electronic expansion valve are controlled according to the operation mode of the air conditioner and the first temperature, so that the fresh air adjustment system is turned on and operated to control the second temperature, which can avoid condensation water on the inner surface or outer surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances. Further, when the air conditioner refrigeration is completed, the fresh air adjustment system is controlled to enter the mildew-proof operation mode, which can prevent the fresh air duct from breeding mildew, and avoid the mildew in the fresh air duct from endangering human health when the fresh air system is turned on next time.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a structural schematic diagram of an air conditioner according to an embodiment of the present invention;

[0021] Figure 2 is a structural schematic diagram of an air conditioner according to another embodiment of the present invention;

[0022] Figure 3 is a control flow chart of an air conditioner in cooling operation according to an embodiment of the present invention;

[0023] Figure 4 is a control flow chart of an air conditioner in cooling operation according to another embodiment of the present invention;

[0024] Figure 5 is a control flow chart of an air conditioner in heating operation according to an embodiment of the present invention;

[0025] Figure 6 is a control flow chart of an air conditioner in heating operation according to another embodiment of the present invention;

[0026] Figure 7 is a flow chart of a fresh air control method for an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0028] The air conditioner of the present invention performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0029] The compressor compresses the refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0030] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0031] The outdoor unit of the air conditioner refers to a part of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0032] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0033] In the present invention, when the air conditioner is in heating operation, the high-temperature and high-pressure refrigerant discharged from the compressor flows into the condenser. At this time, the condenser functions as a radiator. Therefore, the refrigerant heats the indoor air by heat exchange with the indoor air as it flows in the condenser, and dissipates heat by itself and is cooled. The low-temperature and high-pressure refrigerant whose temperature is taken away by the condenser is decompressed by the expansion valve and changed into a low-temperature and low-pressure refrigerant. The refrigerant that flows into the evaporator through the expansion valve is heated by heat exchange with the outdoor air. Then, mainly the low-temperature gas refrigerant is sucked into the compressor from the evaporator via the accumulator.

[0034] Reference below Figure 1-Figure 7An air conditioner and a fresh air control method thereof according to an embodiment of the present invention are described.

[0035] Figure 1 FIG. 1 is a schematic diagram of the structure of an air conditioner according to an embodiment of the present invention. Figure 1 As shown, an air conditioner includes: a refrigeration system, a fresh air system, a fresh air adjustment system, a first temperature sensor, a second temperature sensor and a controller. The refrigeration system swaps the positions of the suction and exhaust pipes in the refrigeration cycle system to heat the indoor air with the evaporator to realize the heating operation of the air conditioner. The refrigeration system includes a compressor, which is used to compress the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharge it to the condenser; the fresh air system includes a fresh air inlet, a fresh air inlet filter, a fresh air motor, a fresh air fan, a fresh air outlet and a fresh air outlet filter, and the fresh air system is used to supply air to the room for ventilation; the fresh air adjustment system includes a fresh air heat exchanger, a fresh air duct, a solenoid valve and an electronic expansion valve, and the fresh air adjustment system is used to adjust the temperature of the fresh air outlet; the first temperature sensor is arranged at the fresh air inlet, and is used to obtain the first temperature of the fresh air inlet; the second temperature sensor is arranged at the fresh air outlet, and is used to obtain the second temperature of the fresh air outlet; the controller is configured to: obtain the operation mode of the air conditioner; after determining that the fresh air system is continuously turned on for a first preset time, based on the operation mode, the solenoid valve and the electronic expansion valve are controlled according to the first temperature, so that the fresh air adjustment system is turned on and operated to control the second temperature.

[0036] Specifically, if Figure 2 As shown, the solenoid valve of the fresh air regulating system is arranged after the throttling device of the outdoor unit, and the fresh air outlet is connected to the indoor heat exchanger. When the solenoid valve and the electronic expansion valve in the fresh air regulating system are in the open state, and the air conditioner is in the heating or cooling mode, the refrigerant in the refrigeration cycle system pipeline can flow through the fresh air regulating system, and after passing through the electronic expansion valve and the fresh air heat exchanger, the temperature of the fresh air outlet can be regulated; when the solenoid valve and the electronic expansion valve in the fresh air regulating system are in the closed state, the refrigerant in the refrigeration cycle pipeline cannot flow through the fresh air regulating system, thereby failing to regulate the temperature of the fresh air outlet.

[0037] In a specific embodiment, when the air conditioner is in cooling mode, the temperature of the outer surface of the indoor fresh air duct (i.e., the indoor temperature) is lower than the fresh air temperature of the inner surface of the fresh air duct (i.e., the outdoor temperature). When the fresh air system is in continuous operation, condensation water is easily generated on the inner surface of the fresh air duct. At this time, if the solenoid valve and the electronic expansion valve in the fresh air conditioning system are in an open state, the fresh air conditioning system is also in a cooling state, and the temperature of the fresh air outlet will gradually decrease, that is, the fresh air temperature of the inner surface of the fresh air duct will gradually decrease. When the fresh air temperature of the inner surface of the fresh air duct does not exceed the first dew point temperature, condensation water will not be generated on the inner surface of the fresh air duct. Among them, the first dew point temperature corresponds to the dew point temperature of the inner surface of the fresh air duct at the indoor ambient temperature and the outdoor ambient humidity.

[0038] In a specific embodiment, when the air conditioner is in the heating mode, the temperature of the outer surface of the indoor fresh air duct (i.e., the indoor temperature) is higher than the fresh air temperature of the inner surface of the fresh air duct (i.e., the outdoor temperature). When the fresh air system is in continuous operation, condensation water is easily generated on the outer surface of the fresh air duct. At this time, if the solenoid valve and the electronic expansion valve in the fresh air conditioning system are in the open state, the fresh air conditioning system is also in the heating state. At this time, the temperature of the fresh air outlet will gradually increase, that is, the fresh air temperature of the inner surface of the fresh air duct will gradually increase. When the fresh air temperature of the inner surface of the fresh air duct exceeds the second dew point temperature, condensation water will not be generated on the outer surface of the fresh air duct. Among them, the second dew point temperature corresponds to the dew point temperature of the outer surface of the fresh air duct at the indoor ambient humidity and the outdoor ambient temperature.

[0039] It should be noted that the first preset time is set to keep the fresh air system in a stable operating state. Exemplarily, the first preset time is 5 minutes.

[0040] Therefore, by obtaining the operating mode of the air conditioner and controlling the solenoid valve and the electronic expansion valve based on the operating mode and the first temperature (i.e., the outdoor temperature), the fresh air conditioning system is turned on to control the second temperature (i.e., the temperature of the fresh air outlet), thereby avoiding the formation of condensation water on the inner or outer surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances.

[0041] In one embodiment of the present invention, when the solenoid valve and the electronic expansion valve are controlled according to the first temperature based on the operating mode so that the fresh air conditioning system is turned on and operated, the controller is specifically configured as follows: when the air conditioner is in cooling mode, determine the first dew point temperature of the inner surface of the fresh air duct; determine whether the first temperature exceeds the first dew point temperature; when the first temperature exceeds the first dew point temperature, control the solenoid valve and the electronic expansion valve to open to lower the second temperature until the second temperature is less than the first dew point temperature; when the first temperature does not exceed the first dew point temperature, control the solenoid valve and the electronic expansion valve not to open.

[0042] In a specific embodiment, Figure 3As shown, when the air conditioner is in cooling mode, if the first temperature exceeds the first dew point temperature, that is, the outdoor temperature exceeds the first dew point temperature, it is considered that the inner surface of the fresh air duct is prone to condensation. At this time, the solenoid valve and the electronic expansion valve are controlled to be turned on, that is, the fresh air conditioning system is controlled to be turned on and operated, so that the temperature of the fresh air outlet will gradually decrease. When the temperature of the fresh air outlet is reduced to less than the first dew point temperature, condensation can be avoided on the inner surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances. When the first temperature does not exceed the first dew point temperature, that is, the outdoor temperature does not exceed the first dew point temperature, it is considered that no condensation will be generated on the inner surface of the fresh air duct, and there is no need to turn on the fresh air conditioning system, that is, the solenoid valve and the electronic expansion valve are controlled not to be turned on.

[0043] In one embodiment of the present invention, when the first temperature exceeds the first dew point temperature, the solenoid valve and the electronic expansion valve are controlled to open to lower the second temperature until the second temperature is less than the first dew point temperature. The controller is specifically configured as follows: after the first temperature does not exceed the first dew point temperature and continues for a second preset time, the solenoid valve and the electronic expansion valve are controlled to close.

[0044] In a specific embodiment, Figure 3 As shown, when the air conditioner is in cooling mode, if the first temperature exceeds the first dew point temperature, that is, the outdoor temperature exceeds the first dew point temperature, it is considered that condensation water is easy to form on the inner surface of the fresh air duct. At this time, the solenoid valve and the electronic expansion valve are controlled to be opened, that is, the fresh air conditioning system is controlled to be started and operated, so that the temperature of the fresh air outlet will gradually decrease. When the temperature of the fresh air outlet decreases to less than the first dew point temperature and lasts for a second preset time, for example, 3 minutes, it is considered that the temperature of the fresh air outlet has been reduced and stabilized below the first dew point temperature. The solenoid valve and the electronic expansion valve are controlled to be closed, and condensation water will not form on the inner surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances.

[0045] In one embodiment of the present invention, the air conditioner also includes a third temperature sensor and a first humidity sensor, wherein the third temperature sensor is used to obtain the indoor ambient temperature, and the first humidity sensor is used to obtain the outdoor ambient humidity. When the air conditioner is in cooling mode and determines the first dew point temperature of the inner surface of the fresh air duct, the controller is specifically configured to: obtain the indoor ambient temperature and the outdoor ambient humidity; and determine the first dew point temperature by querying a pre-calibrated first temperature and humidity mapping table based on the indoor ambient temperature and the outdoor ambient humidity.

[0046] In a specific embodiment, the first dew point temperature is determined according to a first temperature and humidity mapping table, and the first temperature and humidity mapping table includes multiple groups of dew point temperatures corresponding to different indoor ambient temperatures and outdoor ambient temperatures. After the indoor ambient temperature and outdoor ambient humidity are obtained by the third temperature sensor and the first humidity sensor, the first temperature and humidity mapping table can be queried to determine the first dew point temperature, so that when the air conditioner is in cooling mode, the fresh air conditioning system is controlled according to the first temperature and the first dew point temperature, so that the temperature of the fresh air outlet is reduced to less than the first dew point temperature, so as to avoid condensation water on the inner surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances.

[0047] In one embodiment of the present invention, the controller is specifically configured to: when the air conditioner exits the cooling mode, control the air conditioner to operate in heating mode, and control the solenoid valve and the electronic expansion valve to be closed after being opened for a third preset time.

[0048] Specifically, if Figure 3 As shown, when the air conditioner is in cooling mode and the fresh air system is in the on state for a long time, for example, more than 2 hours, if the outdoor humidity is high, the inner surface of the fresh air duct is very humid, which is easy to breed mold and affect human health. Therefore, when the air conditioner refrigeration is finished, the fresh air adjustment system is controlled to enter the anti-mold operation mode, that is, the air conditioner is controlled to heat, and the fresh air adjustment system is controlled to be turned on for a third preset time, for example, 5 minutes, that is, the solenoid valve and the electronic expansion valve are controlled to be closed after being turned on for 5 minutes, so as to prevent the fresh air duct from breeding mold, so as to avoid the mold in the fresh air duct from endangering human health when the fresh air system is turned on next time.

[0049] As a specific embodiment, the following Figure 4 An exemplary description is given of the control flow of the controller in a specific embodiment so as to better understand the control flow of the controller when the air conditioner in the embodiment of the present invention is in a cooling mode.

[0050] Step S102, detect whether the air conditioner is in cooling (dehumidification) mode, if so, go to step S104, otherwise, go to step S118.

[0051] Step S104, detect whether the fresh air function of the air conditioner is turned on, if so, go to step S106, otherwise, go to step S118.

[0052] Step S106, detecting and determining whether the fresh air fan operation time T1 reaches a first preset time, for example, 5 minutes. If so, proceed to step S108, otherwise, proceed to step S118.

[0053] Step S108, detect and determine whether the fresh air inlet temperature exceeds the first dew point temperature, if so, proceed to step S110, otherwise, proceed to step S118.

[0054] Step S110, controlling the solenoid valve and the electronic expansion valve to open so that the temperature of the fresh air outlet will gradually decrease.

[0055] Step S112, after the first temperature does not exceed the first dew point temperature and lasts for a second preset time, the solenoid valve and the electronic expansion valve are controlled to close to avoid condensation on the inner surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances.

[0056] Step S114, the fresh air system is turned on for more than 2 hours and enters the mildew prevention operation mode.

[0057] Step S116, controlling the air conditioner to operate in heating mode, and controlling the solenoid valve and the electronic expansion valve to be closed after being opened for a third preset time, so as to prevent mold from growing in the fresh air duct, thereby preventing the mold in the fresh air duct from endangering human health when the fresh air system is turned on next time.

[0058] Step S118, ending the detection of the control process.

[0059] In one embodiment of the present invention, when the solenoid valve and the electronic expansion valve are controlled according to the first temperature based on the operating mode so that the fresh air conditioning system is turned on and operated, the controller is specifically configured as follows: when the air conditioner is in heating mode, determine the second dew point temperature of the outer surface of the fresh air duct; determine whether the first temperature exceeds the second dew point temperature; when the first temperature does not exceed the second dew point temperature, control the solenoid valve and the electronic expansion valve to open to increase the second temperature until the second temperature is greater than the second dew point temperature; when the first temperature exceeds the second dew point temperature, control the solenoid valve and the electronic expansion valve not to open.

[0060] In a specific embodiment, Figure 5 As shown, when the air conditioner is in heating mode, if the first temperature does not exceed the second dew point temperature, that is, the outdoor temperature does not exceed the second dew point temperature, it is considered that the outer surface of the fresh air duct is prone to condensation. At this time, the solenoid valve and the electronic expansion valve are controlled to be turned on, that is, the fresh air conditioning system is controlled to be turned on and run, so that the temperature of the fresh air outlet will gradually increase. When the temperature of the fresh air outlet increases to be greater than the second dew point temperature, condensation can be avoided on the outer surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances. When the first temperature exceeds the second dew point temperature, that is, the outdoor temperature exceeds the second dew point temperature, it is considered that no condensation will be generated on the outer surface of the fresh air duct, and there is no need to turn on the fresh air conditioning system, that is, the solenoid valve and the electronic expansion valve are controlled not to be turned on.

[0061] In one embodiment of the present invention, when the first temperature does not exceed the second dew point temperature, the solenoid valve and the electronic expansion valve are controlled to open to increase the second temperature until the second temperature is greater than the second dew point temperature. The controller is specifically configured to: after the second temperature exceeds the second dew point temperature and lasts for a second preset time, the solenoid valve and the electronic expansion valve are controlled to close.

[0062] In a specific embodiment, Figure 5 As shown, when the air conditioner is in heating mode, if the first temperature does not exceed the second dew point temperature, that is, the outdoor temperature does not exceed the second dew point temperature, it is considered that condensation water is easy to form on the outer surface of the fresh air duct. At this time, the solenoid valve and the electronic expansion valve are controlled to open, that is, the fresh air regulation system is controlled to start running, so that the temperature of the fresh air outlet will gradually increase. When the temperature of the fresh air outlet increases to be greater than the second dew point temperature and lasts for a second preset time, for example, 3 minutes, it is considered that the temperature of the fresh air outlet has increased and stabilized to above the second dew point temperature, and condensation water will not form on the outer surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances.

[0063] In one embodiment of the present invention, the air conditioner also includes a fourth temperature sensor and a second humidity sensor, wherein the fourth temperature sensor is used to obtain the indoor ambient humidity, and the second humidity sensor is used to obtain the outdoor ambient temperature. When the air conditioner is in heating mode and determines the second dew point temperature of the outer surface of the fresh air duct, the controller is specifically configured to: obtain the indoor ambient humidity and the outdoor ambient temperature; and determine the second dew point temperature by querying a pre-calibrated second temperature and humidity mapping table based on the indoor ambient humidity and the outdoor ambient temperature.

[0064] In a specific embodiment, the second dew point temperature is determined according to a second temperature and humidity mapping table, and the second temperature and humidity mapping table includes a plurality of dew point temperatures corresponding to different indoor ambient humidity and outdoor ambient temperature. After the indoor ambient humidity and the outdoor ambient temperature are acquired by the fourth temperature sensor and the second humidity sensor, the second temperature and humidity mapping table can be queried to determine the second dew point temperature, so that when the air conditioner is in the heating mode, the fresh air conditioning system is controlled according to the first temperature and the second dew point temperature, so that the temperature of the fresh air outlet is increased to be greater than the second dew point temperature, so as to avoid condensation water on the outer surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances.

[0065] As a specific embodiment, the following Figure 6 An exemplary description of the control flow of the controller in the specific embodiment is given to facilitate a better understanding of the control flow of the controller when the air conditioner in the embodiment of the present invention is in the heating mode.

[0066] Step S202, detect whether the air conditioner is in heating mode, if so, proceed to step S204, otherwise, proceed to step S214.

[0067] Step S204, detect whether the fresh air function of the air conditioner is turned on, if so, go to step S206, otherwise, go to step S214.

[0068] Step S206, detect and determine whether the fresh air fan operation time T1 reaches a first preset time, such as 5 minutes. If so, proceed to step S208, otherwise, proceed to step S214.

[0069] Step S208, detect and determine whether the fresh air inlet temperature exceeds the second dew point temperature, if so, proceed to step S210, otherwise, proceed to step S214.

[0070] Step S210, controlling the solenoid valve and the electronic expansion valve to open so that the temperature of the fresh air outlet gradually increases.

[0071] Step S212, after the second temperature exceeds the second dew point temperature and lasts for a second preset time, the solenoid valve and the electronic expansion valve are controlled to close, so that condensation water will not be generated on the outer surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances.

[0072] Step S214, ending the detection of the control process.

[0073] According to the air conditioner of the embodiment of the present invention, after determining that the fresh air system is continuously turned on for the first preset time, the solenoid valve and the electronic expansion valve are controlled according to the operation mode of the air conditioner and the first temperature, so that the fresh air adjustment system is turned on and operated to control the second temperature, which can avoid the formation of condensation water on the inner surface or outer surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances. Further, when the air conditioner refrigeration ends, the fresh air adjustment system is controlled to enter the mildew-proof operation mode, which can prevent the fresh air duct from breeding mildew, and avoid the mildew in the fresh air duct from endangering human health when the fresh air system is turned on next time.

[0074] A further embodiment of the present invention further discloses a fresh air control method for an air conditioner, which is used for the air conditioner as described in any of the above embodiments. Figure 7 FIG. 1 is a flow chart of a fresh air control method for an air conditioner according to an embodiment of the present invention. Figure 7 As shown, the method comprises the following steps:

[0075] Step S1: Obtain the operating mode of the air conditioner.

[0076] Step S2: After determining that the fresh air system is continuously turned on for the first preset time, based on the operation mode, the solenoid valve and the electronic expansion valve are controlled according to the first temperature, so that the fresh air conditioning system is turned on and operated to control the second temperature.

[0077] In one embodiment of the present invention, based on the operation mode, the solenoid valve and the electronic expansion valve are controlled according to the first temperature so that the fresh air conditioning system is turned on and operated, including: when the air conditioner is in the cooling mode, determining the first dew point temperature of the inner surface of the fresh air duct; judging whether the first temperature exceeds the first dew point temperature; when the first temperature exceeds the first dew point temperature, controlling the solenoid valve and the electronic expansion valve to open to reduce the second temperature until the second temperature is less than the first dew point temperature; when the first temperature does not exceed the first dew point temperature, controlling the solenoid valve and the electronic expansion valve not to open.

[0078] In one embodiment of the present invention, when the first temperature exceeds the first dew point temperature, the solenoid valve and the electronic expansion valve are controlled to open to lower the second temperature until the second temperature is less than the first dew point temperature, and it also includes: after the first temperature does not exceed the first dew point temperature and continues for a second preset time, the solenoid valve and the electronic expansion valve are controlled to close.

[0079] In one embodiment of the present invention, the air conditioner also includes a third temperature sensor and a first humidity sensor, wherein the third temperature sensor is used to obtain the indoor ambient temperature, and the first humidity sensor is used to obtain the outdoor ambient humidity. When the air conditioner is in cooling mode, determining the first dew point temperature of the inner surface of the fresh air duct includes: obtaining the indoor ambient temperature and the outdoor ambient humidity; and determining the first dew point temperature by querying a pre-calibrated first temperature and humidity mapping table according to the indoor ambient temperature and the outdoor ambient humidity.

[0080] In one embodiment of the present invention, the fresh air control method of the air conditioner further includes: when the air conditioner exits the cooling mode, controlling the air conditioner to operate in heating mode, and controlling the solenoid valve and the electronic expansion valve to close after opening for a third preset time.

[0081] In one embodiment of the present invention, when the solenoid valve and the electronic expansion valve are controlled according to the first temperature based on the operating mode so that the fresh air conditioning system is turned on and operated, it includes: when the air conditioner is in heating mode, determining the second dew point temperature of the outer surface of the fresh air duct; judging whether the first temperature exceeds the second dew point temperature; when the first temperature does not exceed the second dew point temperature, controlling the solenoid valve and the electronic expansion valve to open to increase the second temperature until the second temperature is greater than the second dew point temperature; when the first temperature exceeds the second dew point temperature, controlling the solenoid valve and the electronic expansion valve not to open.

[0082] In one embodiment of the present invention, when the first temperature does not exceed the second dew point temperature, the solenoid valve and the electronic expansion valve are controlled to open to increase the second temperature until the second temperature is greater than the second dew point temperature, and it also includes: after the second temperature exceeds the second dew point temperature and lasts for a second preset time, the solenoid valve and the electronic expansion valve are controlled to close.

[0083] In one embodiment of the present invention, the air conditioner also includes a fourth temperature sensor and a second humidity sensor, wherein the fourth temperature sensor is used to obtain the indoor ambient humidity, and the second humidity sensor is used to obtain the outdoor ambient temperature. When the air conditioner is in heating mode, determining the second dew point temperature of the outer surface of the fresh air duct includes: obtaining the indoor ambient humidity and the outdoor ambient temperature; and determining the second dew point temperature by querying a pre-calibrated second temperature and humidity mapping table according to the indoor ambient humidity and the outdoor ambient temperature.

[0084] It should be noted that when the fresh air control method of the air conditioner in the embodiment of the present invention controls the temperature of the fresh air system outlet, its specific implementation method is similar to the specific implementation method of the control method of the controller of the mobile air conditioner in the embodiment of the present invention. Please refer to the description of the method part for details. In order to reduce redundancy, it will not be repeated here.

[0085] According to the fresh air control method of the air conditioner of the embodiment of the present invention, after determining that the fresh air system is continuously turned on for the first preset time, the solenoid valve and the electronic expansion valve are controlled according to the operation mode of the air conditioner and the first temperature, so that the fresh air adjustment system is turned on and operated to control the second temperature, which can avoid condensation water on the inner surface or outer surface of the fresh air duct, thereby avoiding damage to indoor walls and electrical appliances. Further, when the air conditioner refrigeration is completed, the fresh air adjustment system is controlled to enter the mildew-proof operation mode, which can prevent the fresh air duct from breeding mildew, and avoid the mildew in the fresh air duct from endangering human health when the fresh air system is turned on next time.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0087] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: A refrigeration system, wherein the positions of the suction and exhaust pipes in the refrigeration cycle system are swapped so as to utilize the evaporator to heat the indoor air, thereby realizing the heating operation of the air conditioner, wherein the refrigeration system comprises a compressor, wherein the compressor is used to compress the low-temperature and low-pressure refrigerant gas into the high-temperature and high-pressure refrigerant gas and discharge it to the condenser; A fresh air system, the fresh air system comprising a fresh air inlet, a fresh air inlet filter, a fresh air motor, a fresh air fan, a fresh air outlet and a fresh air outlet filter, the fresh air system is used to supply air to the room for ventilation; A fresh air conditioning system, the fresh air conditioning system comprising a fresh air heat exchanger, a fresh air duct, a solenoid valve and an electronic expansion valve, the fresh air conditioning system is used to adjust the temperature of the fresh air outlet; the solenoid valve is arranged after the throttling device of the outdoor unit, and the fresh air outlet is connected to the indoor heat exchanger; A first temperature sensor is disposed at the fresh air inlet and is used to obtain a first temperature of the fresh air inlet; A second temperature sensor is provided at the fresh air outlet, and is used to obtain a second temperature of the fresh air outlet; The controller is configured to: obtain the operation mode of the air conditioner; after determining that the fresh air system is continuously turned on for a first preset time, based on the operation mode, control the solenoid valve and the electronic expansion valve according to the first temperature, so that the fresh air conditioning system is turned on and operated to control the second temperature; When the solenoid valve and the electronic expansion valve are controlled according to the first temperature based on the operation mode so that the fresh air conditioning system is turned on and operated, the controller is specifically configured as follows: When the air conditioner is in cooling mode, determining a first dew point temperature of the inner surface of the fresh air duct; determining whether the first temperature exceeds the first dew point temperature; when the first temperature exceeds the first dew point temperature, controlling the solenoid valve and the electronic expansion valve to open, so as to reduce the second temperature until the second temperature is less than the first dew point temperature; when the first temperature does not exceed the first dew point temperature, controlling the solenoid valve and the electronic expansion valve not to open; When the first temperature exceeds the first dew point temperature, the solenoid valve and the electronic expansion valve are controlled to open to reduce the second temperature until the second temperature is less than the first dew point temperature, and the controller is specifically configured as follows: After the first temperature does not exceed the first dew point temperature and lasts for a second preset time, the solenoid valve and the electronic expansion valve are controlled to close.

2. The air conditioner according to claim 1, characterized in that: The air conditioner further includes a third temperature sensor and a first humidity sensor, wherein the third temperature sensor is used to obtain the indoor ambient temperature, and the first humidity sensor is used to obtain the outdoor ambient humidity. When the air conditioner is in a cooling mode and the first dew point temperature of the inner surface of the fresh air duct is determined, the controller is specifically configured as follows: Acquiring the indoor environment temperature and the outdoor environment humidity; The first dew point temperature is determined by querying a pre-calibrated first temperature and humidity mapping table according to the indoor ambient temperature and the outdoor ambient humidity.

3. The air conditioner according to claim 1, characterized in that: The controller is specifically configured as follows: When the air conditioner exits the cooling mode, the air conditioner is controlled to operate in a heating mode, and the solenoid valve and the electronic expansion valve are controlled to be closed after being opened for a third preset time.

4. The air conditioner according to claim 1, characterized in that: When the solenoid valve and the electronic expansion valve are controlled according to the first temperature based on the operation mode so that the fresh air conditioning system is turned on and operated, the controller is specifically configured as follows: When the air conditioner is in a heating mode, determining a second dew point temperature of the outer surface of the fresh air duct; determining whether the first temperature exceeds the second dew point temperature; When the first temperature does not exceed the second dew point temperature, controlling the solenoid valve and the electronic expansion valve to open, so as to increase the second temperature until the second temperature is greater than the second dew point temperature; When the first temperature exceeds the second dew point temperature, the solenoid valve and the electronic expansion valve are controlled not to open.

5. The air conditioner according to claim 4, characterized in that: When the first temperature does not exceed the second dew point temperature, the solenoid valve and the electronic expansion valve are controlled to open to increase the second temperature until the second temperature is greater than the second dew point temperature, and the controller is specifically configured as follows: After the second temperature exceeds the second dew point temperature and lasts for a second preset time, the solenoid valve and the electronic expansion valve are controlled to close.

6. The air conditioner according to claim 3, characterized in that: The air conditioner further includes a fourth temperature sensor and a second humidity sensor, wherein the fourth temperature sensor is used to obtain indoor environmental humidity, and the second humidity sensor is used to obtain outdoor environmental temperature. When the air conditioner is in a heating mode and the second dew point temperature of the outer surface of the fresh air duct is determined, the controller is specifically configured as follows: Get indoor ambient humidity and outdoor ambient temperature; The second dew point temperature is determined by querying a pre-calibrated second temperature and humidity mapping table according to the indoor ambient humidity and the outdoor ambient temperature.

7. A fresh air control method for an air conditioner, characterized in that: For the air conditioner according to any one of claims 1 to 6, the method comprises the following steps: Acquire the operating mode of the air conditioner; After determining that the fresh air system is continuously turned on for a first preset time, based on the operation mode, the solenoid valve and the electronic expansion valve are controlled according to the first temperature, so that the fresh air conditioning system is turned on and operated to control the second temperature.

8. The fresh air control method of the air conditioner according to claim 7, characterized in that: Based on the operation mode, the solenoid valve and the electronic expansion valve are controlled according to the first temperature so that the fresh air conditioning system is turned on and operated, including: When the air conditioner is in cooling mode, determining a first dew point temperature of the inner surface of the fresh air duct; determining whether the first temperature exceeds the first dew point temperature; When the first temperature exceeds the first dew point temperature, controlling the solenoid valve and the electronic expansion valve to open, so as to reduce the second temperature until the second temperature is less than the first dew point temperature; When the first temperature does not exceed the first dew point temperature, the solenoid valve and the electronic expansion valve are controlled not to open.

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