Air conditioner

Abstract

The present application discloses an air conditioner, comprising: a refrigerant circuit in a refrigeration cycle and a fresh air system. The fresh air system includes: a fresh air fan, a fresh air duct, a dehumidifying heat exchanger provided at a fresh air inlet, a drying heat exchanger provided on a side of the dehumidifying heat exchanger away from the fresh air inlet, an outdoor temperature sensor, an outdoor humidity sensor, an indoor temperature sensor, an indoor humidity sensor, and a controller. The dehumidifying heat exchanger and the drying heat exchanger are connected to the refrigerant circuit to introduce refrigerant. The controller is configured to: during the execution of the refrigeration cycle by the air conditioner, when the fresh air system is started and it is determined that the indoor temperature value detected by the indoor temperature sensor does not reach the upper limit value of the outdoor temperature parameter, the first solenoid valve, the second solenoid valve, the third solenoid valve, and the fourth solenoid valve are opened. The dehumidifying heat exchanger is used for cooling and dehumidifying, and the drying heat exchanger is used for heating and drying. The problem of condensate generation at the fresh air duct under the refrigeration cycle is effectively reduced, and the user experience is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of air conditioners, and particularly to an air conditioner. Background Art

[0002] For an air conditioner with a fresh air system for fresh air function, the fresh air system includes a fresh air fan and a fresh air duct. The fresh air fan introduces outdoor air and discharges it into the room through the fresh air duct.

[0003] During the operation of the fresh air, due to temperature difference and air humidity, in the cooling mode, it will cause condensed water on the inner surface of the part of the fresh air duct in the room and at the fresh air outlet of the indoor unit in the fresh air system. Due to structural reasons, the condensed water generated at the fresh air outlet of the indoor unit cannot be completely discharged, and part of the condensed water will flow back into the duct, resulting in a whooshing noise of the air conditioner; in the heating mode, it will also cause condensed water on the outside of the fresh air duct and at the fresh air outlet of the indoor unit, thus affecting the user experience.

[0004] In view of this, this application is proposed. Summary of the Invention

[0005] This application provides an air conditioner. A dehumidification module with a dehumidification heat exchanger and a drying heat exchanger is added to the fresh air system of the air conditioner. The solenoid valve is used to control the flow path to enable the dehumidification heat exchanger to be used for cooling and dehumidification, and the drying heat exchanger is used for heating to ensure dry fresh air, so as to effectively reduce the humidity of the fresh air, avoid the generation of condensed water in the duct during the operation of the fresh air system, and affect the user experience.

[0006] This application provides an air conditioner, including:

[0007] A refrigerant circuit in which the refrigerant circulates through a compressor, a condenser, a throttling device, and an evaporator in sequence in the refrigeration cycle;

[0008] A fresh air system for introducing outdoor fresh air into the room. The fresh air system further includes:

[0009] A fresh air duct for discharging the outdoor fresh air entering the fresh air system from the fresh air inlet into the room;

[0010] A dehumidification heat exchanger provided at the fresh air inlet. One end of the dehumidification heat exchanger is connected to the throttling device through a first solenoid valve, and the other end is connected to the evaporator through a second solenoid valve;

[0011] An exhaust pipe provided at the exhaust end of the compressor;

[0012] A drying heat exchanger is provided on the side of the dehumidifying heat exchanger away from the fresh air inlet. One end of the drying heat exchanger is connected to the air inlet of the exhaust pipe through a third solenoid valve, and the other end of the drying heat exchanger is connected to the air outlet of the exhaust pipe through a fourth solenoid valve;

[0013] An outdoor temperature sensor for detecting the outdoor temperature;

[0014] An outdoor humidity sensor for detecting the outdoor humidity;

[0015] An indoor temperature sensor for detecting the indoor temperature;

[0016] A controller is configured to: during the refrigeration cycle of the air conditioner, when the fresh air system is started, determine the indoor temperature parameter according to the outdoor temperature and outdoor humidity, and when it is determined that the indoor temperature value detected by the indoor temperature sensor does not reach the upper limit value of the indoor temperature parameter, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is opened, the fourth solenoid valve is opened, and the outdoor fresh air passes through the dehumidifying heat exchanger and the drying heat exchanger in sequence and then enters the room through the fresh air duct;

[0017] In the above process, the dehumidifying heat exchanger is used to condense the moisture in the outdoor fresh air to generate condensed water, and the drying heat exchanger is used to heat the outdoor fresh air flowing through the dehumidifying heat exchanger to compensate for the decrease in the temperature of the outdoor fresh air after condensation.

[0018] In some embodiments, the air conditioner further includes:

[0019] An indoor humidity sensor for detecting the indoor temperature;

[0020] A refrigerant circuit in which the refrigerant circulates through a compressor, an evaporator, a throttling device, and a condenser in sequence during the heating cycle;

[0021] The controller is configured to, during the heating cycle of the air conditioner, when the fresh air system is started, determine the indoor temperature parameter according to the indoor temperature and indoor humidity, and when it is determined that the outdoor temperature value detected by the outdoor temperature sensor does not reach the upper limit value of the indoor temperature parameter, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is opened, the fourth solenoid valve is opened, and the outdoor fresh air passes through the dehumidifying heat exchanger for heat exchange and temperature rise and the drying heat exchanger for heat exchange and temperature rise in sequence and then enters the room through the fresh air duct.

[0022] In some embodiments, the controller is configured to, during the heating cycle of the air conditioner, when the fresh air system is started, when it is determined that the outdoor temperature reaches the upper limit value of the indoor temperature parameter, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is closed, the fourth solenoid valve is closed, and the outdoor fresh air passes through the dehumidifying heat exchanger for heat exchange and temperature rise and then enters the room through the fresh air duct.

[0023] In some embodiments, it further includes a partition board which is arranged between the dehumidifying heat exchanger and the drying heat exchanger.

[0024] In some embodiments, it further includes a water guide groove which is arranged below the dehumidifying heat exchanger and is used for collecting the condensed water formed by the condensation of water vapor in the outdoor fresh air in the refrigeration mode.

[0025] In some embodiments, a drain hole is formed at a position of the water guide groove close to the condenser, and the water guide groove is inclined from the side far away from the drain hole to the side close to the drain hole.

[0026] In some embodiments, the fresh air system further includes a filter which is arranged on one side of the dehumidifying heat exchanger close to the fresh air inlet, and the filter is used for filtering impurities in the outdoor fresh air.

[0027] In some embodiments, the controller is configured to, when the air conditioner executes the refrigeration cycle and the fresh air system is used to exchange fresh air indoors, if it is determined that the indoor temperature value has not reached the upper limit value of the outdoor temperature parameter, the first solenoid valve is closed, the second solenoid valve is closed, the third solenoid valve is closed, the fourth solenoid valve is closed, and the outdoor fresh air directly flows to the indoor through the fresh air duct without passing through the heat exchange of the dehumidifying heat exchanger and the drying heat exchanger.

[0028] In some embodiments, in the refrigeration cycle, before determining the relationship between the indoor temperature value and the outdoor temperature parameter, it further includes the step of determining whether the indoor temperature sensor, the outdoor temperature sensor, the indoor humidity sensor and the indoor temperature sensor are working properly. When one or a combination of the indoor temperature sensor, the outdoor temperature sensor, the indoor humidity sensor and the indoor temperature sensor cannot work properly, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is opened, and the fourth solenoid valve is opened.

[0029] In some embodiments, in the heating cycle, before determining the relationship between the outdoor temperature value and the indoor temperature parameter, it further includes the step of determining whether the indoor temperature sensor, the outdoor temperature sensor, the indoor humidity sensor and the indoor temperature sensor are working properly. When one or a combination of the indoor temperature sensor, the outdoor temperature sensor, the indoor humidity sensor and the indoor temperature sensor cannot work properly, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is closed, and the fourth solenoid valve is closed.

[0030] In some embodiments, the indoor temperature parameter is set as the indoor dew point temperature, and the outdoor temperature parameter is set as the outdoor dew point temperature.

[0031] In some embodiments, the outdoor temperature sensor and the outdoor humidity sensor are arranged at the fresh air inlet to detect the temperature and humidity of the outdoor fresh air entering the fresh air system.

[0032] In the above embodiment, an air conditioner can at least implement a refrigeration cycle. In the refrigeration cycle, a refrigerant circuit in which a refrigerant circulates in sequence through a compressor, a condenser, a throttling device, and an evaporator. The air conditioner further includes a fresh air system for introducing outdoor fresh air into the room. The fresh air system further includes a fresh air fan and a fresh air duct for discharging the outdoor fresh air entering the fresh air system from the fresh air inlet to the room, a dehumidifying heat exchanger provided at the fresh air inlet, a drying heat exchanger provided on the side of the dehumidifying heat exchanger away from the fresh air inlet, and an exhaust pipe provided at the exhaust end of the compressor; an outdoor temperature sensor for detecting the outdoor temperature, an outdoor humidity sensor for detecting the outdoor humidity, an indoor temperature sensor for detecting the indoor temperature, an indoor humidity sensor for detecting the indoor humidity, and a controller. The dehumidifying heat exchanger and the drying heat exchanger are connected to the refrigerant circuit to introduce the refrigerant. Specifically, one end of the dehumidifying heat exchanger is connected to one end of the throttling device close to the evaporator through a first solenoid valve, and the other end of the dehumidifying heat exchanger is connected to one end of the evaporator close to the throttling device through a second solenoid valve. One end of the drying heat exchanger is connected to the air inlet of the exhaust pipe through a third solenoid valve, and the other end of the drying heat exchanger is connected to the air outlet of the exhaust pipe through a fourth solenoid valve. The controller is configured to: during the process of the air conditioner executing the refrigeration cycle, when the fresh air system is started and it is determined that the indoor temperature value detected by the indoor temperature sensor does not reach the upper limit value of the outdoor temperature parameter, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is opened, the fourth solenoid valve is opened, and the outdoor fresh air passes through the dehumidifying heat exchanger and the drying heat exchanger in sequence and then enters the room through the fresh air duct. During this process, the dehumidifying heat exchanger is used to condense the moisture in the outdoor fresh air to generate condensed water, and the drying heat exchanger is used to heat the outdoor fresh air flowing through the dehumidifying heat exchanger to compensate for the decrease in the temperature of the outdoor fresh air after condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Shows an operation scenario of an air conditioner according to some embodiments;

[0034] Figure 2 Shows a schematic diagram of the refrigerant flow in the refrigeration mode of a heat pump according to some embodiments;

[0035] Figure 3 Shows a schematic diagram of the refrigerant flow in the heating mode of a heat pump according to some embodiments;

[0036] Figure 4 Shows a schematic diagram of the refrigerant flow in the refrigeration mode of a single refrigerant according to some embodiments;

[0037] Figure 5 Shows a schematic diagram of the structure of a fresh air system in the related art;

[0038] Figure 6Shows a schematic structural diagram of a fresh air system according to some embodiments;

[0039] Figure 7 Shows a partial schematic structural diagram of a fresh air system according to some embodiments;

[0040] A flowchart of a method for displaying time zone information;

[0041] Figure 8 Shows another schematic structural diagram of a fresh air system according to some embodiments;

[0042] Figure 9 Shows a schematic diagram of the refrigerant flow in the air-conditioning system and fresh air system of a cooling and heating machine in the cooling mode according to some embodiments;

[0043] Figure 10 Shows a schematic diagram of the refrigerant flow in the air-conditioning system and fresh air system of a cooling and heating machine in the heating mode according to some embodiments;

[0044] Figure 11 Shows a schematic diagram of the refrigerant flow in the air-conditioning system and fresh air system of a single-cooling machine in the cooling mode according to some embodiments;

[0045] Figure 12 Shows a flowchart of the operation of an air conditioner under a refrigeration cycle according to some embodiments;

[0046] Figure 13 Shows the operation process of an air conditioner under a heating cycle according to some embodiments;

[0047] Figure 14 Shows a logic flowchart of the working states of various sensors in the cooling mode according to some embodiments;

[0048] Figure 15 Shows a control logic diagram of a fresh air system in the cooling mode according to some embodiments;

[0049] Figure 16 Shows a control logic diagram of a fresh air system in the heating mode according to some embodiments.

[0050] Figure 17 Shows a logic flowchart of the working states of various sensors in the heating mode according to some embodiments;

[0051] In the above figures:

[0052] Indoor unit 100; outdoor unit 200; control device 300;

[0053] Compressor 1; condenser 2; exhaust end 11; suction end 12; four-way valve 5;

[0054] Two-way stop valve 6; three-way stop valve 7; outdoor fan 81; outdoor fan motor 82;

[0055] Evaporator 3; throttling device 4; first solenoid valve 91; second solenoid valve 92;

[0056] Third solenoid valve 93; fourth solenoid valve 94;

[0057] Fresh air system 400; dehumidifying heat exchanger 401; drying heat exchanger 402; filter 403;

[0058] Fresh air fan 404; fresh air system housing 405; partition 406; controller 407;

[0059] Water guide groove 408; drain hole 409; fresh air duct 410. Detailed implementation mode

[0060] To make the purpose and implementation mode of this application clearer, the following will clearly and completely describe the exemplary implementation mode of this application in combination with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only a part of the embodiments of this application, rather than all the embodiments.

[0061] It should be noted that the brief description of the terms in this application is only for the convenience of understanding the following described implementation mode, rather than intending to limit the implementation mode of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meanings.

[0062] The terms "first", "second", "third", etc. in the specification, claims and above-mentioned drawings of this application are used to distinguish similar or the same kind of objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that such used terms can be interchanged under appropriate circumstances.

[0063] The terms "include" and "have" and any of their variations are intended to cover but not exclusively include. For example, a product or device that includes a series of components does not necessarily have to be limited to all the clearly listed components, but may include other components that are not clearly listed or are inherent to these products or devices.

[0064] An air conditioner provided in this embodiment performs the refrigeration and heating cycles of the air conditioner by using a compressor 1, a condenser 2, a throttling device 4 and an evaporator 3. The refrigeration cycle and the heating cycle include a compression process, a condensation process, an expansion process and an evaporation process, and provide cooling or heating to the indoor space through the heat absorption and heat release processes of the refrigerant, so as to realize the temperature adjustment of the indoor space.

[0065] The compressor 1 compresses the refrigerant gas into a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser 2. The condenser 2 condenses the compressed high-temperature and high-pressure gaseous refrigerant into a liquid refrigerant, and the heat is released to the surrounding environment through the condensation process.

[0066] The liquid refrigerant flowing out of the condenser 2 enters the throttling device 4, and the throttling device 4 throttles the high-temperature and high-pressure liquid refrigerant condensed in the condenser 2 into a low-pressure liquid refrigerant. The low-pressure liquid refrigerant flowing out of the throttling device 4 enters the evaporator 3. When the liquid refrigerant flows through the evaporator 3, it absorbs heat and evaporates into a low-temperature and low-pressure refrigerant gas, and returns the low-temperature and low-pressure refrigerant gas to the compressor 1. The evaporator 3 can achieve the refrigeration effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the whole cycle, the air conditioner can adjust the temperature of the indoor space.

[0067] The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor 1 and the outdoor heat exchanger. The indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0068] The indoor heat exchanger and the outdoor heat exchanger can be used as the condenser 2 or the evaporator 3. When the indoor heat exchanger is used as the condenser 2, the air conditioner is used as a heater in the heating mode. When the indoor heat exchanger is used as the evaporator 3, the air conditioner is used as a cooler in the cooling mode.

[0069] The air conditioner provided by the present embodiment can have various implementation forms. For example, an integrated air conditioner, a split air conditioner, etc. Figure 1 This is a specific implementation manner of the air conditioner of the present application.

[0070] Figure 1 It is a schematic diagram of the operation scenario of the air conditioner according to the embodiment, as Figure 1 shown, the user controls the air conditioner through a smart device or a control device 300.

[0071] In some embodiments, the control device 300 can be a remote control. The communication between the remote control and the air conditioner includes infrared protocol communication or Bluetooth protocol communication, as well as other short-distance communication methods, to control the air conditioner wirelessly or wiredly. The user can input user instructions through the buttons on the remote control, voice input, and control panel input to control the air conditioner.

[0072] In some embodiments, a smart device (such as a mobile terminal, a tablet computer, a computer, a laptop computer, etc.) can also be used to control the air conditioner. For example, use an application program running on the smart device to control the air conditioner.

[0073] In some embodiments, instead of receiving instructions using the above-mentioned intelligent device or control device, the controller 407 can receive user control through touch or gestures, etc.

[0074] In some embodiments, the air conditioner can also be controlled in ways other than the control device 300 and the intelligent device. For example, it can directly receive voice instructions from the user through a module configured inside the air conditioner device to obtain voice instructions, or it can receive voice instructions from the user through a voice control device set outside the air conditioner device.

[0075] In some embodiments, the air conditioner also communicates with a server. The air conditioner is allowed to communicate and connect through a local area network (LAN), a wireless local area network (WLAN), and other networks. The server can provide various contents and interactions to the air conditioner. The server can be a cluster or multiple clusters, and can include one type or multiple types of servers.

[0076] Taking a split air conditioner as an example, the air conditioner includes an indoor unit 100 and an outdoor unit 200. Among them, the indoor unit 100 further includes a housing of the indoor unit 100, and the housing of the indoor unit 100 includes an indoor fan, an indoor fan motor, and an evaporator 3. When the indoor fan motor operates, the indoor fan rotates, and uses negative pressure to suck indoor air from the indoor air inlet into the housing of the indoor unit 100. After heat exchange through the evaporator 3, it flows out from the air outlet of the indoor unit 100.

[0077] The outdoor unit 200 includes a housing of the outdoor unit 200, and the housing of the outdoor unit 200 includes a compressor 1, a throttling device 4, a condenser 2, an outdoor fan 81, and an outdoor fan motor 82. Among them, the compressor 1, the throttling device 4, and the condenser 2 can be connected by copper pipes, and refrigerant is filled inside. The outdoor fan motor 82 drives the outdoor fan 81 to rotate, forming negative pressure on the side of the outdoor fan 81, so that the outdoor air exchanges heat with the condenser 2. The heat exchange devices of the indoor unit 100 and the outdoor unit 200 are connected by indoor and outdoor connecting pipes.

[0078] The air conditioner in this application can be a single-cooling air conditioner or a heat pump. A single-cooling air conditioner refers to an air conditioner that only has a refrigeration function, and a heat pump refers to an air conditioner that has both refrigeration and heating capabilities.

[0079] Next, first take a heat pump as an example to illustrate the structure of the air conditioning system.

[0080] Refer to Figures 2-3 , the heat pump has an air conditioning system that can perform a refrigeration cycle and a heating cycle. The air conditioning system includes a compressor 1, a condenser 2, an evaporator 3, a throttling device 4, a three-way stop valve 7, a two-way stop valve 6, and a four-way valve 5.

[0081] Refer to Figure 2In the refrigeration cycle, port 1 and port 3 of the four-way valve 5 are connected, and port 2 and port 4 are connected. The high-temperature refrigerant compressed by the compressor 1 passes through port 3 and port 1 of the four-way valve 5 and then enters the condenser 2, causing the temperature in the condenser 2 to rise. Under the operation of the outdoor fan motor 82, the air flow passing through the condenser 2 will take away the heat of the condenser 2, thereby reducing the refrigerant temperature. Then the refrigerant enters the throttling device 4. After the refrigerant pressure is reduced by the throttling device 4, the refrigerant temperature is further reduced. The refrigerant passes through the indoor and outdoor connecting pipes and the two-way stop valve 6 and flows into the evaporator 3. After the refrigerant flows through the evaporator 3 for heat exchange, it returns to the outdoor unit 200 through the indoor and outdoor connecting pipes and the three-way stop valve 7, passes through ports 2 and 4 of the four-way valve 5, and then enters the compressor 1 through the suction end of the compressor 1 for compression. This cycle is repeated, thereby continuously transferring the heat in the indoor environment to the outdoors.

[0082] Reference Figure 3 In the heating cycle, port 2 and port 3 of the four-way valve 5 are connected, and port 1 and port 4 are connected. The high-temperature refrigerant compressed by the compressor 1 passes through ports 2 and 3 of the four-way valve 5, and then passes through the indoor and outdoor connecting pipes and the three-way stop valve 7 to enter the evaporator 3. After the refrigerant exchanges heat through the evaporator 3, it passes through the indoor and outdoor connecting pipes and the two-way stop valve 6 and enters the throttling device 4. After the refrigerant pressure is reduced by the throttling device 4, the refrigerant temperature is further reduced, and then the refrigerant enters the condenser 2. After heat exchange, it returns to the compressor 1 again through ports 1 and 4 of the four-way valve 5 and the suction end of the compressor 1 for compression, and the cycle continues, thereby continuously absorbing heat from the outdoor environment and transmitting it to the indoor unit 100.

[0083] Then, the structure of the air conditioning system is explained by taking a cooling-only air conditioner as an example.

[0084] Reference Figure 4 The single-cooling type air conditioner has an air conditioning system that can perform a refrigeration cycle. The air conditioning system includes a compressor 1, a condenser 2, an evaporator 3, a throttling device 4, a three-way stop valve 7 and a two-way stop valve 6.

[0085] In the refrigeration cycle, the high-temperature refrigerant compressed by the compressor 1 enters the condenser 2, causing the temperature inside the condenser 2 to rise. Under the operation of the outdoor fan motor 82, the air flow passing through the condenser 2 will take away the heat of the condenser 2, thereby reducing the refrigerant temperature. Then the refrigerant enters the throttling device 4. After the refrigerant pressure is reduced by the throttling device 4, the refrigerant temperature is further reduced. The refrigerant passes through the indoor and outdoor connecting pipes and the two-way stop valve 6 and flows into the evaporator 3. After the refrigerant flows through the evaporator 3 for heat exchange, it passes through the indoor and outdoor connecting pipes and the three-way stop valve 7, and then enters the compressor 1 through the suction end of the compressor 1 for compression. This cycle is repeated, thereby continuously transferring the heat in the indoor environment to the outdoors.

[0086] In the related art, in order to improve the indoor air quality, the concept of a fresh air system 400 was proposed. Specifically, the fresh air system 400 is used to introduce outdoor fresh air into the room to improve the user's comfort. Specifically, referring to Figure 5 , the negative pressure generated by the fresh air fan 404 system is used to introduce outdoor fresh air into the fresh air system housing 405, and then it is discharged into the room through the fresh air duct 410. Although the above technical solution can achieve the introduction of fresh air, it does not consider the impact of outdoor fresh air in different scenarios on the fresh air system 400. Exemplarily, due to the indoor-outdoor temperature difference and air humidity, during the refrigeration cycle and heating cycle of the air conditioner, condensate will be generated in the fresh air duct 410 of the fresh air system 400 and flow back to the indoor unit 100, resulting in noise during the operation of the indoor unit 100, which greatly affects the user experience.

[0087] To solve the above problems, the present application improves the fresh air system 400 to change the temperature and humidity state of the outdoor fresh air entering the room, so as to solve the problem of condensate generation near the fresh air duct 410 of the fresh air system 400.

[0088] Referring to Figure 6 , the fresh air system 400 in the present application, in addition to including a fresh air fan 404, a fresh air inlet, a fresh air duct 410 and a fresh air outlet, further includes a dehumidification system. Among them, the dehumidification system includes a dehumidification heat exchanger 401 and a drying heat exchanger 402. The dehumidification heat exchanger 401 is arranged at the fresh air inlet, and the drying heat exchanger 402 is arranged on the side of the dehumidification heat exchanger 401 away from the fresh air inlet. Refrigerant flows inside the dehumidification heat exchanger 401 and the drying heat exchanger 402. The dehumidification heat exchanger 401 and the drying heat exchanger 402 are connected to the air conditioning system through pipelines and the flow path is controlled by a solenoid valve. The dehumidification heat exchanger 401 is used for cooling and dehumidifying, and the drying heat exchanger 402 is used for heating to ensure the dryness of the fresh air, so as to effectively reduce the humidity of the outdoor fresh air and avoid the generation of condensate in the fresh air duct 410 during the operation of the fresh air system 400, affecting the user experience.

[0089] Specifically, referring to Figures 9-11The way to connect the dehumidifying heat exchanger 401 to the air-conditioning system is that the refrigerant in the dehumidifying heat exchanger 401 is introduced through a pipeline from the position between the throttling component and the evaporator 3. Exemplarily, one end of the dehumidifying heat exchanger 401 is connected to one end of the throttling device 4 close to the evaporator 3 through the first solenoid valve 91, and the other end of the dehumidifying heat exchanger 401 is connected to one end of the evaporator 3 close to the throttling device 4 through the second solenoid valve 92; More specifically, the refrigerant in the dehumidifying heat exchanger 401 is introduced through a pipeline from the position between the throttling component and the two-way stop valve 6. Exemplarily, one end of the dehumidifying heat exchanger 401 is connected to one side of the throttling device 4 close to the two-way stop valve 6 through the first solenoid valve 91, and the other end of the dehumidifying heat exchanger 401 is connected to the side of the two-way stop valve 6 away from the evaporator 3 through the second solenoid valve 92.

[0090] Referring to Figure 9 , in the refrigeration mode, the refrigerant flow direction of the dehumidifying heat exchanger 401 is: flowing in from the throttling device 4 end through the second solenoid valve 92, after heat exchange in the dehumidifying heat exchanger 401, flowing back through the first solenoid valve 91 into the refrigerant circuit in the refrigeration cycle of the air-conditioning system, and then flowing into the evaporator 3 through the two-way stop valve 6.

[0091] Referring to Figure 10 , in the heating mode, the refrigerant flow direction of the dehumidifying heat exchanger 401 is: flowing into the dehumidifying heat exchanger 401 from the evaporator 3 end through the first solenoid valve 91, after heat exchange in the dehumidifying heat exchanger 401, flowing through the second solenoid valve 92 to the throttling device 4.

[0092] It should be noted that the refrigerant in the dehumidifying heat exchanger 401 can also be introduced from other positions of the air-conditioning system, as long as the condition of low-temperature refrigerant is satisfied. Exemplarily, the suction end 12 of the compressor 1.

[0093] The way to connect the drying heat exchanger 402 to the air-conditioning system is that one end of the drying heat exchanger 402 is connected to the inlet of the exhaust pipe provided at the exhaust end 11 of the compressor 1 through the third solenoid valve 93, and the other end of the drying heat exchanger 402 is connected to the outlet of the above exhaust pipe through the fourth solenoid valve 94, so that the high-temperature refrigerant passing through the compressor 1 of the compressor 1 enters the condenser 2 or the evaporator 3 all the way through the exhaust pipe, and the other way passes through the third solenoid valve 93 into the drying heat exchanger 402, after heat exchange in the drying heat exchanger 402, and then returns to the outlet end of the exhaust pipe through the fourth solenoid valve 94.

[0094] Since the refrigerant flowing in the drying heat exchanger 402 is the high-temperature refrigerant after compression, the refrigerant flow direction in the drying heat exchanger 402 is: flowing into the drying heat exchanger 402 from the exhaust port of the compressor 1 through the third solenoid valve 93, and after heat exchange, flowing back through the fourth solenoid valve 94 to the end far from the exhaust port of the inlet to rejoin the refrigerant circuit to form the refrigerant cycle.

[0095] The on-off states of the flow paths where the above-mentioned dehumidifying heat exchanger 401 and drying heat exchanger 402 are located are controlled by solenoid valves.

[0096] It should be noted that when the fresh air system 400 of the air conditioner is closed, the first solenoid valve 91, the second solenoid valve 92, the third solenoid valve 93, and the fourth solenoid valve 94 are all in the closed state, and the flow paths where the dehumidifying heat exchanger 401 and the drying heat exchanger 402 are located are in the disconnected state.

[0097] In some embodiments of the present application, referring to Figure 8 , the fresh air system 400 further includes a partition plate 406, and the partition plate 406 is disposed between the dehumidifying heat exchanger 401 and the drying heat exchanger 402.

[0098] Specifically, the fresh air system 400 includes a fresh air system housing 405. Inside the fresh air system housing 405, a dehumidifying heat exchanger 401 and a drying heat exchanger 402 are provided. A partition plate 406 is disposed between the dehumidifying heat exchanger 401 and the drying heat exchanger 402 to separate the two, which can prevent the condensed water generated by the dehumidifying heat exchanger 401 from flowing into the area of the drying heat exchanger 402 and being evaporated and re-entering the fresh air, thereby realizing the function of collecting condensed water. Exemplarily, the partition plate 406 can be formed by extending from the base of the fresh air system housing 405.

[0099] In some embodiments of the present application, referring to Figures 7-8 , the fresh air system 400 further includes a water guide groove 408, and the water guide groove 408 is disposed below the dehumidifying heat exchanger 401 for collecting the condensed water formed by the condensation of water vapor in the outdoor fresh air in the cooling mode.

[0100] Specifically, a water guide groove 408 is provided inside the fresh air system housing 405, and the water guide groove 408 is disposed below the dehumidifying heat exchanger 401 to receive the condensed water condensed at low temperature by the dehumidifying heat exchanger 401.

[0101] It should be noted that the water guide groove 408 can extend to below the drying heat exchanger 402 to receive the condensed water condensed on the surface of the drying heat exchanger 402 during the heat exchange process.

[0102] In some embodiments of the present application, in order to facilitate the drainage of condensed water, referring to Figure 7 , a drain hole 409 is provided in the water guide groove 408 at a position close to the condenser 2 of the outdoor unit 200, and the water guide groove 408 is inclined from the side far from the drain hole 409 to the side close to the drain hole 409 to facilitate the drainage of the condensed water in the water guide groove 408.

[0103] Specifically, a through hole is provided at a position on the base of the fresh air system housing 405 corresponding to the position of the dehumidification heat exchanger 401 and close to the condenser 2. This through hole is used for draining water. At the same time, the water guide groove 408 is set to be inclined towards the drain hole 409, enabling the condensed water generated during the dehumidification process to be discharged from the small holes in a timely manner. At the same time, the drain hole 409 is arranged close to the condenser 2 and above the condenser 2, so that the condensed water generated during the dehumidification process can flow onto the condenser 2 of the outdoor unit 200 after flowing out of the fresh air system 400, thereby making full use of the cold quantity of the condensed water, improving the heat exchange efficiency of the outdoor condenser 2, and enhancing the performance of the air conditioning system.

[0104] In some embodiments of the present application, referring to Figure 8 , the fresh air system 400 further includes a filter 403. The filter 403 is arranged on the side of the dehumidification heat exchanger 401 close to the fresh air inlet. The filter 403 is used to filter impurities in the outdoor fresh air. When the outdoor fresh air enters the fresh air system 400, it first passes through the filter 403 for filtration to filter out particulate impurities contained in the outdoor fresh air.

[0105] In order to further detect the indoor and outdoor environmental parameters, the indoor unit 100 further includes an indoor temperature sensor and an indoor humidity sensor. The indoor humidity sensor is used to detect the indoor humidity, and the indoor temperature sensor is used to detect the indoor temperature Ti. The indoor temperature parameter can be determined based on the indoor temperature Ti and the indoor humidity.

[0106] The outdoor unit 200 further includes an outdoor temperature sensor for detecting the outdoor temperature To and an outdoor humidity sensor for detecting the outdoor humidity. The outdoor temperature parameter can be determined based on the outdoor humidity and the outdoor temperature To.

[0107] It should be noted that a temperature and humidity sensor can also be directly used to detect temperature and humidity simultaneously.

[0108] It should be noted that in order to more accurately judge the various parameters of the outdoor fresh air, the outdoor temperature sensor and the outdoor humidity sensor are arranged at the fresh air inlet of the fresh air system 400 to collect the temperature and humidity conditions of the outdoor air in real time. In cooperation with the indoor temperature and humidity sensors, under the action of a special control logic, the operation of the entire air conditioner equipped with the fresh air system 400 can be made more intelligent, reliable, and energy-saving.

[0109] In some embodiments of the present application, the indoor temperature parameter is the indoor dew point temperature Tis, and the outdoor temperature parameter is the outdoor dew point temperature Tos.

[0110] The indoor dew point temperature Tis can be calculated by the collected indoor temperature Ti and indoor humidity through a formula. Different indoor temperatures Ti and indoor humidities correspond to different indoor dew point temperatures Tis. Similarly, the outdoor dew point temperature Tos can be calculated by the collected outdoor temperature To and outdoor humidity through a formula. Different outdoor temperatures To and outdoor humidities correspond to different outdoor dew point temperatures Tos.

[0111] In order to better control the operation of each component of the air conditioner, especially to control the operation of the fresh air system 400 under the refrigeration cycle and the heating cycle, the controller 407 in this application is configured to control the on / off states of the first solenoid valve 91, the second solenoid valve 92, the third solenoid valve 93, and the fourth solenoid valve 94 under the refrigeration cycle and the heating cycle according to the comparison of indoor and outdoor environmental parameters, so as to control the working states of the dehumidification heat exchanger 401 and the drying heat exchanger 402, and solve the problem of condensate water in the fresh air system 400.

[0112] The above-mentioned controller 407 controls the operation of the air conditioner and responds to the operations of users through various software control programs stored in the memory. The controller 407 controls the overall operation of the air conditioner. For example: in response to a control instruction received from a user using the control device 300 or a smart device, perform an operation related to the object selected by the control instruction, or control the working states of each solenoid valve according to the detected environmental parameters.

[0113] In some embodiments, the controller 407 includes at least one of a Central Processing Unit (CPU), a video processor, an audio processor, a Graphics Processing Unit (GPU), a Random Access Memory (RAM), a Read-Only Memory (ROM), a first interface to an nth interface for input / output, a communication bus (Bus), etc.

[0114] Refer to Figure 12 , to illustrate the working process of the air conditioner under the refrigeration cycle. Specifically, determine whether the fresh air system 400 is started (step S11);

[0115] After determining in step S11 that the fresh air system 400 is not started, execute step S121 and continue to execute the refrigeration cycle;

[0116] After determining in step S11 that the fresh air system 400 is started, measure the indoor temperature parameter according to the outdoor temperature and outdoor humidity, and then execute step S122 to determine whether the indoor temperature value detected by the indoor temperature sensor reaches the upper limit value of the outdoor temperature parameter;

[0117] When it is determined in step S122 that the indoor temperature value detected by the indoor temperature sensor has not reached the upper limit value of the outdoor temperature parameter, it is determined that the environmental difference between the indoor and outdoor is large and condensation water is likely to be generated. Then, step S131 is executed, the first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is opened, the fourth solenoid valve 94 is opened, and the outdoor fresh air passes through the dehumidification heat exchanger 401 and the drying heat exchanger 402 in sequence and then enters the room through the fresh air duct 410;

[0118] In step S131, the low-temperature refrigerant flows in the dehumidification heat exchanger 401 to cool and dehumidify the outdoor fresh air, so as to condense the moisture in the outdoor fresh air to generate condensation water; the high-temperature refrigerant flows in the drying heat exchanger 402 to heat and dry the low-temperature and low-humidity outdoor fresh air flowing through the dehumidification heat exchanger 401, thereby compensating for the decrease in the temperature of the outdoor fresh air after condensation, enabling the outdoor fresh air to achieve constant-temperature dehumidification, effectively avoiding the generation of condensation water on the inner surface of the fresh air duct 410, and further improving the user experience.

[0119] It should be noted that the low temperature and low humidity, and high temperature and high humidity in this application are relative states in the circulation loop.

[0120] When it is determined in step S122 that the indoor temperature value detected by the indoor temperature sensor reaches the upper limit value of the outdoor temperature parameter, it is determined that the environmental difference between the indoor and outdoor is in a safe state, that is, it is not easy to generate condensation water near the fresh air duct 410. The fresh air system 400 does not need to perform dehumidification operation on the outdoor fresh air. Step S132 is executed, the first solenoid valve 91 is closed, the second solenoid valve 92 is closed, the third solenoid valve 93 is closed, the fourth solenoid valve 94 is closed, and the outdoor fresh air directly flows through the fresh air duct 410 to the room without passing through the heat exchange of the dehumidification heat exchanger 401 and the drying heat exchanger 402.

[0121] In the refrigeration mode, under the action of the fresh air fan 404, the outdoor fresh air enters the fresh air system 400 from the fresh air inlet, and the particulate impurities in the fresh air are filtered out by the filter 403, and then cooled and dehumidified through the dehumidification heat exchanger 401. The low-temperature refrigerant with a temperature similar to that of the throttled refrigerant flows in the dehumidification heat exchanger 401. When the outdoor fresh air passes through, heat exchange occurs with it and the temperature decreases. When the temperature drops below the dew point temperature of the outdoor fresh air, the water vapor in the outdoor fresh air will condense to generate condensation water, thereby achieving the purpose of fresh air dehumidification, effectively avoiding the problem of condensation water generation at the fresh air supply outlet and in the fresh air duct when the untreated high-temperature and high-humidity fresh air enters the relatively low-temperature indoor environment;

[0122] The outdoor fresh air cooled by the dehumidification heat exchanger 401 flows through the drying heat exchanger 402. In the drying heat exchanger 402, there is a refrigerant with a relatively high temperature flowing. When the outdoor fresh air passes through, heat exchange occurs with it to dry and warm the low-temperature and low-humidity outdoor fresh air, which can avoid the generation of condensate on the outer surface of the outside of the fresh air system 400 and the fresh air duct 410 due to the low-temperature fresh air after cooling and dehumidification, thus affecting the service life of the machine.

[0123] Through the above steps, the problem in the related art that the air conditioner with the fresh air system 400 will cause condensate on the inner surface of the indoor part of the fresh air duct 410 and at the fresh air outlet position of the indoor unit during refrigeration, and due to structural reasons, the condensate generated at the fresh air outlet position of the indoor unit cannot be completely discharged, and part of the condensate will flow back into the duct, resulting in a whooshing sound of the machine, is effectively solved.

[0124] In some embodiments of the present application, with reference to Figure 13 , the working process of the air conditioner under the heating cycle is described. Specifically, it is judged whether the fresh air system 400 is started (step S21);

[0125] After judging in step S21 that the fresh air system 400 is not started, step S221 is executed, and the heating cycle is continued;

[0126] After judging in step S21 that the fresh air system 400 is started, after measuring the indoor temperature parameter according to the indoor temperature and indoor humidity, step S222 is executed to judge whether the outdoor temperature value detected by the outdoor temperature sensor reaches the upper limit value of the indoor temperature parameter;

[0127] When it is judged in step S222 that the outdoor temperature value detected by the outdoor temperature sensor does not reach the upper limit value of the indoor temperature parameter, step S231 is executed, the first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is opened, the fourth solenoid valve 94 is opened, and the outdoor fresh air enters the room through the dehumidification heat exchanger 401 for heat exchange and temperature rise and the drying heat exchanger 402 for heat exchange and temperature rise and then through the fresh air duct 410;

[0128] In step S231, a refrigerant with a temperature similar to that of the refrigerant at the front end of the throttling device 4 flows in the dehumidification heat exchanger 401 to initially heat the outdoor fresh air and slightly increase the temperature of the outdoor fresh air; a high-temperature refrigerant with a temperature close to that at the exhaust end 11 of the compressor 1 flows in the drying heat exchanger 402. When the outdoor fresh air passes through the drying heat exchanger 402 and heat exchange occurs with it, the preheated outdoor fresh air is further heated and raised to a state close to the indoor supply air temperature, which can effectively avoid the problem of condensate generation on the outer surface of the indoor part of the fresh air duct 410 due to the too low temperature of the outdoor fresh air, and at the same time improve the heating efficiency.

[0129] In step S222, when it is determined that the outdoor temperature value detected by the outdoor temperature sensor reaches the upper limit value of the indoor temperature parameter, step S232 is executed. The first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is closed, and the fourth solenoid valve 94 is closed. The outdoor fresh air is heated and raised in temperature through the dehumidifying heat exchanger 401 and then enters the room through the fresh air duct 410.

[0130] In step S222, the possibility of generating condensate is relatively low at this time. The first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is closed, and the fourth solenoid valve 94 is closed. Only the dehumidifying heat exchanger 401 is used to preliminarily preheat the outdoor fresh air.

[0131] Through the above steps, in the heating mode, under the action of the fresh air fan 404, fresh air enters the fresh air system 400 from the system inlet end, and the particulate impurities in the fresh air are filtered out by the filter 403, and then are preliminarily preheated through the dehumidifying heat exchanger 401; the fresh air after being preheated by the dehumidifying heat exchanger 401 flows through the drying heat exchanger 402, and when the fresh air passes through, heat exchange is carried out with it to further dry and raise the temperature of the preheated fresh air. The fresh air after being preheated by the two heat exchangers enters the fresh air duct 410 under the action of the fresh air fan 404 system and is finally sent into the room. It effectively solves the problem of generating condensate outside the fresh air duct 410 during heating and improves the user experience.

[0132] In practical applications, when each sensor fails, it will not be possible to correctly serve as the basis for the controller 407 to control the solenoid valve switch. Therefore, it is planned to first determine whether the indoor temperature sensor, indoor humidity sensor, outdoor temperature sensor, and outdoor humidity sensor are working properly before using the controller 407 to judge the relationship between each environmental parameter to ensure the smooth progress of the entire fresh air dehumidification process. When one or more of the above sensors fail or malfunction, the dehumidification function of the fresh air system 400 is turned on.

[0133] Specifically, refer to Figure 14 , to illustrate the logical process of the working states of each sensor in the cooling mode.

[0134] First, determine whether the indoor temperature sensor is in a normal working state (step S135);

[0135] In step S135, when it is determined that the indoor temperature sensor is in a normal working state, step S136 is executed to determine whether the indoor humidity sensor is in a normal working state;

[0136] In step S136, when it is determined that the indoor humidity sensor is in a normal working state, step S137 is executed to determine whether the outdoor temperature sensor is in a normal working state;

[0137] In step S137, it is judged that the outdoor temperature sensor is in a normal working state, and step S138 is executed to judge whether the outdoor humidity sensor is in a normal working state;

[0138] In step S138, it is judged that the outdoor humidity sensor is in a normal working state, and step S139 is executed, and all sensors of the air conditioner are in a normal working state.

[0139] In step S138, it is judged that the outdoor humidity sensor is not in a normal working state, and step S100 is executed, the first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is opened, and the fourth solenoid valve 94 is opened;

[0140] In step S137, it is judged that the outdoor temperature sensor is not in a normal working state, and step S100 is executed, the first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is opened, and the fourth solenoid valve 94 is opened;

[0141] In step S136, it is judged that the indoor humidity sensor is not in a normal working state, and step S100 is executed, the first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is opened, and the fourth solenoid valve 94 is opened;

[0142] In step S135, it is judged that the indoor temperature sensor is not in a normal working state, and step S100 is executed, the first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is opened, and the fourth solenoid valve 94 is opened.

[0143] Refer to Figure 17 , and illustrate the logical flow of the working states of each sensor in the heating mode.

[0144] First, judge whether the indoor temperature sensor is in a normal working state (step S175);

[0145] In step S175, it is judged that the indoor temperature sensor is in a normal working state, and step S176 is executed to judge whether the indoor humidity sensor is in a normal working state;

[0146] In step S176, it is judged that the indoor humidity sensor is in a normal working state, and step S177 is executed to judge whether the outdoor temperature sensor is in a normal working state;

[0147] In step S177, it is judged that the outdoor temperature sensor is in a normal working state, and step S178 is executed to judge whether the outdoor humidity sensor is in a normal working state;

[0148] In step S178, it is judged that the outdoor humidity sensor is in a normal working state, and step S179 is executed, and all sensors of the air conditioner are in a normal working state;

[0149] In step S178, it is determined that the outdoor humidity sensor is not in a normal working state, and step S200 is executed. The first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is closed, and the fourth solenoid valve 94 is closed;

[0150] In step S177, it is determined that the outdoor temperature sensor is not in a normal working state, and step S200 is executed. The first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is closed, and the fourth solenoid valve 94 is closed;

[0151] In step S176, it is determined that the indoor humidity sensor is not in a normal working state, and step S200 is executed. The first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is closed, and the fourth solenoid valve 94 is closed;

[0152] In step S175, it is determined that the indoor temperature sensor is not in a normal working state, and step S200 is executed. The first solenoid valve 91 is opened, the second solenoid valve 92 is opened, the third solenoid valve 93 is closed, and the fourth solenoid valve 94 is closed.

[0153] It should be noted that the judgment process of whether the above sensors fail can be adjusted according to requirements or settings, and the judgment order is not unique. Similarly, the steps for judging the working state of the air conditioner are not unique. It can first judge the cooling mode and then the heating mode, or first judge the heating mode and then the cooling mode.

[0154] To sum up, referring to Figure 15 , it illustrates the control logic diagram of the fresh air system 400 in the cooling mode in this application.

[0155] First, in the cooling mode, the fresh air system 400 is started (step S151); then the indoor and outdoor temperature sensors and the indoor and outdoor humidity sensors continuously detect the indoor and outdoor temperatures and the indoor and outdoor humidities, and calculate the indoor dew point temperature Tis and the outdoor dew point temperature Tos (step S152); subsequently, it is determined whether the indoor and outdoor temperature sensors and the indoor and outdoor humidity sensors fail (step S153);

[0156] If it is determined in step S153 that there is no failure, then step S154 is executed to determine whether the indoor environmental temperature is less than or equal to the dew point temperature corresponding to the outdoor fresh air temperature and humidity,

[0157] In step S154, if it is determined that the indoor environmental temperature is less than or equal to the dew point temperature corresponding to the outdoor fresh air temperature and humidity, then step S155 is executed. The first solenoid valve 91, the second solenoid valve 92, the third solenoid valve 93, and the fourth solenoid valve 94 are all opened, and the fresh air module performs dehumidification and drying treatment on the fresh air;

[0158] In step S154, if it is determined that the indoor environmental temperature is not less than or equal to the dew point temperature corresponding to the outdoor fresh air temperature and humidity, then step S156 is executed, and the first solenoid valve 91, the second solenoid valve 92, the third solenoid valve 93, and the fourth solenoid valve 94 are all closed, and the fresh air is directly supplied without dehumidifying the fresh air.

[0159] If it is determined to be invalid in step S153, then step S155 is executed, and the first solenoid valve 91, the second solenoid valve 92, the third solenoid valve 93, and the fourth solenoid valve 94 are all opened, and the fresh air module dehumidifies and dries the fresh air.

[0160] Refer to Figure 16 , and illustrate the control logic diagram of the fresh air system 400 in the heating mode in this application.

[0161] First, in the heating mode, the fresh air system 400 is started (step S161); then the indoor and outdoor temperature sensors and the indoor and outdoor humidity sensors continuously detect the indoor and outdoor temperatures and the indoor and outdoor humidities, and calculate the indoor dew point temperature Tis and the outdoor dew point temperature Tos (step S162); subsequently, it is determined whether the indoor and outdoor temperature sensors and the indoor and outdoor humidity sensors are invalid (step S163);

[0162] If it is determined to be not invalid in step S163, then step S164 is executed to determine whether the outdoor fresh air temperature is less than or equal to the dew point temperature corresponding to the indoor temperature Ti.

[0163] In step S164, if it is determined that the outdoor fresh air temperature To is less than or equal to the dew point temperature corresponding to the indoor temperature Ti, then step S165 is executed, and the first solenoid valve 91, the second solenoid valve 92, the third solenoid valve 93, and the fourth solenoid valve 94 are all opened, and the fresh air module performs a deep preheating process on the fresh air.

[0164] In step S164, if it is determined that the outdoor fresh air temperature To is not less than or equal to the dew point temperature corresponding to the indoor temperature Ti, then step S166 is executed, and the first solenoid valve 91 and the second solenoid valve 92 are opened, and the third solenoid valve 93 and the fourth solenoid valve 94 are closed, and the outdoor fresh air is subjected to a preliminary preheating process.

[0165] If it is determined to be invalid in step S163, then step S166 is executed, and the first solenoid valve 91 and the second solenoid valve 92 are opened, and the third solenoid valve 93 and the fourth solenoid valve 94 are closed, and the outdoor fresh air is subjected to a preliminary preheating process.

[0166] In an embodiment of the present application, an air conditioner is proposed. The air conditioner has a fresh air system 400 provided with a dehumidification system. The dehumidification system at least includes a dehumidification heat exchanger 401 and a drying heat exchanger 402. The on-off of the flow path is controlled by a solenoid valve to achieve that in the refrigeration cycle, the dehumidification heat exchanger 401 is used for cooling and dehumidifying, and the drying heat exchanger 402 is used for heating and drying. At the same time, in the heating cycle, the dehumidification heat exchanger 401 and the drying heat exchanger 402 are used for preheating, so as to effectively reduce the problem of condensate generation at the fresh air duct 410 in the refrigeration cycle and the heating cycle, effectively improve the user experience. At the same time, a partition 406 is provided on the base of the fresh air system 400 to separate the dehumidification heat exchanger 401 and the drying heat exchanger 402, so as to realize the function of collecting fresh air condensate; the water guide groove 408 on the base of the fresh air system 400 is slightly inclined at the position corresponding to the dehumidification heat exchanger 401, and small holes are opened at the position close to the condenser 2, so that the condensate generated during the dehumidification process can be discharged and flow onto the condenser 2, so as to make full use of the cold quantity of the condensate, improve the heat exchange efficiency of the outdoor condenser 2, reduce energy consumption and improve the performance of the air conditioning system.

[0167] In the description process of the solution of the present invention, in order to take into account both the refrigeration and heating modes, the heat pump unit is mainly taken as an example for illustration. For the single-cooling unit, the above-mentioned fresh air system 400 with dehumidification function can also be installed. The specific situation is as Figure 5 shown. Therefore, whether it is a single-cooling unit or a heat pump unit, as long as the above-mentioned fresh air dehumidification solution is adopted, it should be included in the protection scope. The above-mentioned invention solution gives the control logic in order to make the functions of the whole system more accurate and perfect. However, in the actual use process, if the above control logic is not adopted and the temperature is not collected and judged, and it is directly defaulted that the fresh air system 400 starts to dehumidify or preheat the fresh air, a similar effect can also be achieved. Therefore, those who adopt the above solution principle but do not adopt the control logic should also be included in the protection scope of this invention.

[0168] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0169] For the sake of convenience in explanation, the above description has been made in connection with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. According to the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. An air conditioner, characterized in that, Comprising: A refrigerant circuit in which the refrigerant circulates in sequence through a compressor, a condenser, a throttling device, and an evaporator in a refrigeration cycle; A fresh air system for introducing outdoor fresh air into the room, and the fresh air system further includes: A fresh air duct for discharging the outdoor fresh air entering the fresh air system from the fresh air inlet into the room; A dehumidifying heat exchanger provided at the fresh air inlet, one end of the dehumidifying heat exchanger is connected to one end of the throttling device close to the evaporator through a first solenoid valve, and the other end of the dehumidifying heat exchanger is connected to one end of the evaporator close to the throttling device through a second solenoid valve; An exhaust pipe provided at the exhaust end of the compressor; A drying heat exchanger provided on the side of the dehumidifying heat exchanger away from the fresh air inlet, one end of the drying heat exchanger is connected to the inlet of the exhaust pipe through a third solenoid valve, and the other end of the drying heat exchanger is connected to the outlet of the exhaust pipe through a fourth solenoid valve; An outdoor temperature sensor for detecting the outdoor temperature; An outdoor humidity sensor for detecting the outdoor humidity; An indoor temperature sensor for detecting the indoor temperature; A controller configured to: during the refrigeration cycle of the air conditioner, when the fresh air system is started, obtain an outdoor temperature parameter according to the outdoor temperature and the outdoor humidity, and when it is determined that the indoor temperature value detected by the indoor temperature sensor does not reach the upper limit value of the outdoor temperature parameter, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is opened, the fourth solenoid valve is opened, and the outdoor fresh air sequentially passes through the dehumidifying heat exchanger and the drying heat exchanger and then enters the room through the fresh air duct; During the above process, the dehumidifying heat exchanger is used to condense the moisture in the outdoor fresh air to generate condensed water, and the drying heat exchanger is used to heat the outdoor fresh air flowing through the dehumidifying heat exchanger to compensate for the decrease in the temperature of the outdoor fresh air after condensation.

2. The air conditioner according to claim 1, characterized in that, Further comprising: An indoor humidity sensor for detecting the indoor humidity; A refrigerant circuit in which the refrigerant circulates in sequence through a compressor, an evaporator, a throttling device, and a condenser in a heating cycle; The controller is configured to, during the heating cycle of the air conditioner, when the fresh air system is started, obtain an indoor temperature parameter according to the indoor temperature and the indoor humidity, and when it is determined that the outdoor temperature value detected by the outdoor temperature sensor does not reach the upper limit value of the indoor temperature parameter, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is opened, the fourth solenoid valve is opened, and the outdoor fresh air sequentially passes through the dehumidifying heat exchanger for heat exchange and temperature rise and the drying heat exchanger for heat exchange and temperature rise and then enters the room through the fresh air duct.

3. The air conditioner according to claim 2, characterized in that, The controller is configured to, during the heating cycle of the air conditioner, when the fresh air system is started and it is determined that the outdoor temperature reaches the upper limit value of the indoor temperature parameter, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is closed, the fourth solenoid valve is closed, and the outdoor fresh air passes through the dehumidifying heat exchanger for heat exchange and temperature rise and then enters the room through the fresh air duct.

4. The air conditioner according to claim 1, characterized in that, It further includes a partition board which is arranged between the dehumidifying heat exchanger and the drying heat exchanger.

5. The air conditioner according to claim 4, characterized in that, It further includes a water guide trough which is arranged below the dehumidifying heat exchanger and is used for collecting the condensed water formed by the condensation of water vapor in the outdoor fresh air in the refrigeration mode.

6. The air conditioner according to claim 5, characterized in that, A drain hole is formed at a position of the water guide trough close to the condenser, and the water guide trough inclines from a side far away from the drain hole to a side close to the drain hole.

7. The air conditioner according to claim 1, characterized in that, The fresh air system further includes a filter which is arranged on a side of the dehumidifying heat exchanger close to the fresh air inlet, and the filter is used for filtering impurities in the outdoor fresh air.

8. The air conditioner according to claim 1, characterized in that, The controller is configured to, during the process of the air conditioner executing the refrigeration cycle, after the fresh air system is started, when it is judged that the indoor temperature value does not reach the upper limit value of the outdoor temperature parameter, the first solenoid valve is closed, the second solenoid valve is closed, the third solenoid valve is closed, the fourth solenoid valve is closed, and the outdoor fresh air directly flows to the room through the fresh air duct without passing through the heat exchange of the dehumidifying heat exchanger and the drying heat exchanger.

9. The air conditioner according to claim 1, characterized in that, In the refrigeration cycle, before judging the relationship between the indoor temperature value and the outdoor temperature parameter, it further includes a step of judging whether the indoor temperature sensor, the outdoor temperature sensor, the indoor humidity sensor and the indoor temperature sensor are working normally. When one or a combination of the indoor temperature sensor, the outdoor temperature sensor, the indoor humidity sensor and the indoor temperature sensor cannot work normally, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is opened, and the fourth solenoid valve is opened.

10. The air conditioner according to claim 2, characterized in that, In the heating cycle, before judging the relationship between the outdoor temperature value and the indoor temperature parameter, it further includes a step of judging whether the indoor temperature sensor, the outdoor temperature sensor, the indoor humidity sensor and the indoor temperature sensor are working normally. When one or a combination of the indoor temperature sensor, the outdoor temperature sensor, the indoor humidity sensor and the indoor temperature sensor cannot work normally, the first solenoid valve is opened, the second solenoid valve is opened, the third solenoid valve is closed, and the fourth solenoid valve is closed.

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