Air conditioner

Abstract

The application discloses an air conditioner, comprising a shell, a fresh air module, a negative ion generator, a fresh air motor, a driving motor and a fresh air valve, the driving motor is used for driving the fresh air valve to open or close, the fresh air module is used for introducing outdoor fresh air into indoor, a micro pressure difference sensor is used for sensing the pressure difference between indoor and outdoor air and outputting a voltage signal, and a controller is configured to acquire the voltage signal V output by the micro pressure difference sensor and control the flow of outdoor air and indoor air. The controller can control the negative ion generator, the fresh air motor and the driving motor according to the detection of the micro pressure sensor, when the concentration of pollutants or carbon dioxide in the indoor air exceeds the set value, the concentration of pollutants or carbon dioxide in the indoor air is reduced, and when the concentration of pollutants or carbon dioxide in the indoor air is in the normal range, the unnecessary energy consumption of the negative ion generator, the fresh air motor and the driving motor is reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to an air conditioner. Background Technology

[0002] In related technologies, commonly used pollutant sensors in the industry include PM2.5 dust sensors, organic pollutant sensors, and carbon dioxide sensors. There are two common control methods for air conditioning fresh air systems: one is manual mode, where the air conditioner usually does not have a sensor to detect indoor air quality, but only a button or icon for turning on the fresh air system on the display screen or mobile APP interface. When users feel that the indoor air quality is poor, they can manually turn the fresh air system on and off by clicking the button or icon. The other is semi-automatic mode, where the air conditioner collects the concentration of pollutants in the indoor air through pollutant sensors. When the pollutant concentration is detected to rise to a certain value, the air conditioner prompts the user to manually turn on the air conditioning fresh air system on the display screen or mobile APP. When the pollutant concentration is detected to drop to a certain value, the air conditioner prompts the user to manually turn off the air conditioning fresh air system.

[0003] However, in terms of detection and control, due to the complex composition of pollutants in the home environment, including organic pollutants, particulate pollutants, and carbon dioxide, individual PM2.5 dust sensors, organic pollutant sensors, and carbon dioxide sensors are difficult to comprehensively and accurately reflect the indoor pollution situation. If these sensors are used simultaneously for indoor air quality detection, not only is the detection cost high, but the data processing workload of the indoor controller is also large, requiring high storage and data processing capabilities from the chip. Moreover, conventional methods for detecting pollutant composition and concentration cannot accurately reflect subtle changes in indoor air quality, only indicating the air quality level to the user, which is not suitable for precise control of the fresh air module. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an air conditioner. This air conditioner can reduce the concentration of pollutants or carbon dioxide in indoor air, and can also reduce unnecessary energy consumption of negative ion generators, fresh air motors, and drive motors.

[0005] An air conditioner according to the present invention includes: a housing; a fresh air module disposed within the housing, the fresh air module comprising: a negative ion generator, a fresh air motor, a drive motor, and a fresh air valve, the drive motor being drivenly connected to the fresh air valve, the drive motor being used to drive the fresh air valve to open or close, the fresh air module being used to introduce outdoor fresh air into the room to achieve indoor-outdoor air exchange; a micro-differential pressure sensor disposed on the housing, the micro-differential pressure sensor being used to sense the pressure difference between indoor air and outdoor air, and outputting a voltage signal proportional to the pressure difference value; and a controller configured to: acquire the voltage signal V output by the micro-differential pressure sensor; when determining that the voltage signal V exceeds a preset value V1, control the negative ion generator to turn on, control the drive motor to drive the fresh air valve to open, and control the fresh air motor to operate at a speed v1 to introduce outdoor air into the room; when determining that the voltage signal V does not exceed the preset value V1, control the negative ion generator not to turn on, control the fresh air motor not to operate, and control the fresh air valve not to open.

[0006] According to the air conditioner of the present invention, the pressure difference between indoor and outdoor air is detected by a micro-pressure sensor, which can reflect the indoor air quality. Moreover, the controller can control the negative ion generator, the fresh air motor, and the drive motor according to the detection results of the micro-pressure sensor. In this way, when the indoor pollutant concentration or carbon dioxide concentration exceeds the set value, the exchange between outdoor and indoor air is realized, thereby reducing the concentration of pollutants or carbon dioxide in the indoor air. When the indoor pollutant concentration or carbon dioxide concentration is within the normal range, unnecessary energy consumption of the negative ion generator, the fresh air motor, and the drive motor can be reduced.

[0007] In some examples of the present invention, after controlling the negative ion generator to turn on, controlling the drive motor to drive the fresh air valve to open, and controlling the fresh air motor to operate at a speed v1, the controller is further configured to: after time T1, determine whether the voltage signal V output by the micro differential pressure sensor has decreased; if so, control the fresh air motor to continue operating at a speed v1 until the voltage signal V does not exceed the preset value V1, then control the negative ion generator to turn off, control the fresh air motor to stop operating, and control the drive motor to drive the fresh air valve to close.

[0008] In some examples of the present invention, the controller is further configured to: after time T1, if it is determined that the voltage signal V output by the micro differential pressure sensor has not decreased, then control the fresh air motor to operate at a speed v2, where v2 > v1.

[0009] In some examples of the present invention, the controller is further configured to: after controlling the fresh air motor to run at a speed of v2 for a time T1, determine whether the voltage signal V output by the micro differential pressure sensor has decreased; if so, control the fresh air motor to continue running at a speed of v2 until the voltage signal V does not exceed the preset value V1, control the negative ion generator to turn off, control the fresh air motor to stop running, and control the drive motor to drive the fresh air valve to close.

[0010] In some examples of the present invention, the controller is further configured to: after controlling the fresh air motor to run at a speed of v2 for T1, if it is determined that the voltage signal V output by the micro differential pressure sensor has not decreased, then control the fresh air motor to run at a speed of v3, wherein v3 > v2.

[0011] In some examples of the present invention, the controller is further configured to: determine whether the time T during which the fresh air motor operates at speed v3 exceeds a preset time threshold T2; when the time T does not exceed the preset time threshold T2, determine whether the voltage signal V output by the micro differential pressure sensor exceeds the preset value V1; when the voltage signal V does not exceed the preset value V1, control the negative ion generator to turn off, control the fresh air motor to stop operating, and control the drive motor to drive the fresh air valve to close; when the voltage signal V exceeds the preset value V1, control the fresh air motor to continue operating at speed v3.

[0012] In some examples of the present invention, the controller is further configured to: when time T exceeds a preset time threshold T2, control the negative ion generator to turn off, control the fresh air motor to stop running, and control the drive motor to drive the fresh air valve to close; and after the time for controlling the negative ion generator to turn off, controlling the fresh air motor to stop running, and controlling the drive motor to drive the fresh air valve to close reaches time T3, control the negative ion generator to turn on, control the drive motor to drive the fresh air valve to open, and control the fresh air motor to run at a speed v3.

[0013] In some examples of the present invention, the controller is further configured to: determine whether the time for which the fresh air motor operates continuously at a speed of V3 reaches a time threshold T4, wherein T4>T2; if so, control the negative ion generator to turn off, control the fresh air motor to stop operating, and control the drive motor to drive the fresh air valve to close.

[0014] In some examples of the present invention, the controller is further configured to: determine whether the voltage signal V output by the micro differential pressure sensor exceeds the preset value V1 if the time for which the fresh air motor continuously operates at speed V3 does not reach the time threshold T4; control the negative ion generator to turn off, control the fresh air motor to stop operating, and control the drive motor to drive the fresh air valve to close if the voltage signal V exceeds the preset value V1; and control the fresh air motor to continue operating at speed v3 if the voltage signal V exceeds the preset value V1.

[0015] In some examples of the present invention, the controller is further configured to periodically acquire the voltage signal V output by the micro differential pressure sensor with a time period of T4, so as to periodically control the operating status of the negative ion generator, the fresh air valve and the fresh air motor according to the relationship between the voltage signal V and the preset value V1.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the structure of an air conditioner according to the present invention;

[0019] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 This is a schematic diagram of the structure of a micro differential pressure sensor;

[0021] Figure 4 This is an automatic control flowchart of an air conditioner according to the present invention.

[0022] Figure label:

[0023] 1. Air conditioner;

[0024] 10. Housing; 20. Fresh air module; 21. Negative ion generator; 22. Fresh air motor; 23. Drive motor; 24. Fresh air valve; 30. Controller; 40. Micro differential pressure sensor; 41. Printed circuit board; 42. Interface terminal; 43. Microelectromechanical system; 44. High-pressure chamber pressure tap; 45. Low-pressure chamber pressure tap; 50. Fresh air duct socket; 60. Fresh air inlet baffle; 61. Connecting hole; 70. Fresh air outlet. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0026] The following is for reference. Figures 1-4 An air conditioner 1 according to an embodiment of the present invention is described.

[0027] Air conditioner 1 includes an indoor unit and an outdoor unit. The indoor and outdoor units are connected by pipes to transfer refrigerant. The indoor unit includes an indoor heat exchanger and an indoor fan. The outdoor unit includes a compressor, a four-way valve, an outdoor heat exchanger, an outdoor fan, and an expansion valve. The compressor, outdoor heat exchanger, expansion valve, and indoor heat exchanger, connected in sequence, form a refrigerant circuit. The refrigerant circulates in the refrigerant circuit and exchanges heat with the air through the outdoor and indoor heat exchangers, respectively, to achieve either the cooling or heating mode of air conditioner 1.

[0028] The compressor is configured to compress the refrigerant so that the low-pressure refrigerant is compressed to form a high-pressure refrigerant.

[0029] The outdoor heat exchanger is configured to exchange heat between outdoor air and refrigerant transported within it. For example, in the cooling mode of the air conditioner 1, the outdoor heat exchanger operates as a condenser, causing the refrigerant compressed by the compressor to dissipate heat to the outdoor air and condense. In the heating mode of the air conditioner 1, the outdoor heat exchanger operates as an evaporator, causing the depressurized refrigerant to absorb heat from the outdoor air and evaporate.

[0030] In some embodiments, the outdoor heat exchanger further includes heat exchange fins to increase the contact area between the outdoor air and the refrigerant transported in the outdoor heat exchanger, thereby improving the heat exchange efficiency between the outdoor air and the refrigerant.

[0031] The outdoor fan is configured to draw outdoor air into the outdoor unit through the second air inlet and discharge the outdoor air, after heat exchange with the outdoor heat exchanger, through the third air outlet. The outdoor fan provides power for the flow of outdoor air.

[0032] An expansion valve connects the outdoor and indoor heat exchangers. The opening degree of the expansion valve regulates the refrigerant pressure flowing through both heat exchangers, thereby regulating the refrigerant flow rate between them. The flow rate and pressure of the refrigerant flowing between the outdoor and indoor heat exchangers affect their heat exchange performance. The expansion valve can be an electronic valve. Its opening degree is adjustable to control the flow rate and pressure of the refrigerant passing through it.

[0033] The four-way valve is connected to the refrigerant circuit and is configured to switch the flow direction of the refrigerant in the refrigerant circuit so that the air conditioner 1 can perform a cooling mode or a heating mode.

[0034] The indoor heat exchanger is configured to exchange heat between indoor air and refrigerant transported within it. For example, in the cooling mode of the air conditioner 1, the indoor heat exchanger operates as an evaporator, causing the refrigerant, after dissipating heat from the outdoor heat exchanger, to absorb heat from the indoor air and evaporate. In the heating mode of the air conditioner 1, the indoor heat exchanger operates as a condenser, causing the refrigerant, after absorbing heat from the outdoor heat exchanger, to dissipate heat to the indoor air and condense.

[0035] In some embodiments, the indoor heat exchanger further includes heat exchange fins to increase the contact area between indoor air and the refrigerant transported in the indoor heat exchanger, thereby improving the heat exchange efficiency between indoor air and the refrigerant.

[0036] The indoor fan is configured to draw indoor air into the indoor unit through the third air inlet and discharge the indoor air, after heat exchange with the indoor heat exchanger, through the fourth air outlet. The indoor fan provides power for the airflow.

[0037] The air conditioner 1 also includes a control unit. The control unit is configured to control the operating frequency of the compressor, the opening degree of the expansion valve, the speed of the outdoor fan, and the speed of the indoor fan. The control unit is connected to the compressor, expansion valve, outdoor fan, and indoor fan via data cables to transmit communication information.

[0038] The control device includes a processor. The processor may include a central processing unit (CPU), a microprocessor, or an application-specific integrated circuit (ASIC), and may be configured to perform corresponding operations described in the control device when the processor executes a program stored in a non-transitory computer-readable medium coupled to the control device. The non-transitory computer-readable storage medium may include magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), smart cards, or flash memory devices (e.g., erasable programmable read-only memory (EPROM), card, stick, or keyboard drivers).

[0039] like Figures 1-3As shown, the air conditioner 1 according to an embodiment of the present invention includes: a housing 10, a fresh air module 20, a micro differential pressure sensor 40, and a controller 30. The housing 10 mainly serves for installation and fixation, allowing other components of the air conditioner 1 to be fixed to the housing 10, thus making the overall setup of the air conditioner 1 more stable and reliable. Furthermore, the housing 10 makes the external structure of the air conditioner 1 more integrated and concise. The fresh air module 20 mainly functions for indoor-outdoor air exchange, introducing fresh outdoor air into the room to achieve indoor-outdoor air exchange. The micro differential pressure sensor 40 serves a detection function, detecting the pressure difference between indoor and outdoor air. The controller 30 mainly functions for control.

[0040] like Figure 1 and Figure 2 As shown, the fresh air module 20 is housed within the casing 10, which secures its position and ensures a more robust and stable installation, allowing for more consistent operation. The fresh air module 20 includes a negative ion generator 21, a fresh air motor 22, a drive motor 23, and a fresh air valve 24. The negative ion generator 21 primarily purifies the air, cleaning the indoor air. The fresh air motor 22 powers the fresh air fan, drawing fresh air into the fresh air module 20 and ultimately releasing it into the room. The drive motor 23 provides the driving function, while the fresh air valve 24 opens and closes, selectively allowing fresh air to enter the fresh air module 20.

[0041] like Figure 1 , Figure 2 and Figure 4 As shown, the drive motor 23 is connected to the fresh air valve 24, and the drive motor 23 is used to drive the fresh air valve 24 to open or close. That is, when the drive motor 23 is working, it can rotate the drive shaft. Since the drive shaft of the drive motor 23 is connected to the fresh air valve 24, the drive motor 23 can provide power for the operation of the fresh air valve 24, thereby controlling the opening or closing of the fresh air valve 24. When the drive motor 23 controls the fresh air valve 24 to close, the fresh air valve 24 is in a closed state, and outdoor fresh air cannot enter the room through the fresh air module 20, that is, it cannot circulate and exchange with the indoor air. When the drive motor 23 controls the fresh air valve 24 to open, the fresh air valve 24 is in a connected state, and outdoor fresh air can enter the room through the fresh air valve 24. That is, outdoor fresh air can be introduced into the room through the fresh air module 20, realizing the exchange of indoor and outdoor air.

[0042] like Figures 1-3As shown, the micro differential pressure sensor 40 is mounted on the housing 10 to sense the pressure difference between indoor and outdoor air and output a voltage signal proportional to the pressure difference. The micro differential pressure sensor 40 primarily functions to detect pressure differences. Mounting it on the housing 10 secures its position, making its installation more robust and stable, and allowing for more consistent operation. Furthermore, mounting the micro differential pressure sensor on the housing 10 provides a more rational placement, facilitating contact sensing between the sensor and both indoor and outdoor air.

[0043] like Figures 1-3 As shown, the micro differential pressure sensor 40 is used to sense the pressure difference between indoor and outdoor air and output a voltage signal proportional to the pressure difference. It should be noted that the micro differential pressure sensor 40 includes a printed circuit board 41 and an interface terminal 42. The interface terminal 42 is connected to the indoor main control board via a wiring harness. The micro differential pressure sensor 40 also includes a microelectromechanical system 43, i.e., a MEMS system, the core of which is a silicon piezoresistive pressure-sensitive chip, which is surface-mount packaged and soldered to the printed circuit board 41. The two sides of this silicon piezoresistive pressure-sensitive chip sense different pressures through pressure taps, thereby forming a pressure difference and generating a voltage signal proportional to the pressure difference. This voltage signal is then output to the controller 30 through the interface terminal 42. The micro differential pressure sensor 40 also includes a high-pressure chamber pressure tap 44 and a low-pressure chamber pressure tap 45. The high-pressure chamber pressure tap 44 is connected to the indoor air through an air tube to sense the indoor air pressure, and the low-pressure chamber pressure tap 45 is connected to the outdoor air through an air tube to sense the outdoor air pressure.

[0044] Among them, the micro differential pressure sensor 40 adopts a surface-mount package, which occupies little space and is easy to install in the narrow fresh air duct. Moreover, the micro differential pressure sensor 40 integrates a silicon piezoresistive pressure sensitive chip. By sensing the small pressure difference between the two air inlets, it can detect the slight change in the indoor and outdoor air pressure difference, and has high control accuracy.

[0045] In addition, such as Figure 4 As shown, controller 30 is configured as follows:

[0046] S1. Obtain the voltage signal V output by the micro differential pressure sensor 40. That is, the analog voltage signal V output by the micro differential pressure sensor 40 will be sent to the controller 30. The controller 30 will analyze and judge the received voltage signal V, and then issue corresponding control signals to the corresponding actuators based on the analysis and judgment results.

[0047] S11. When the voltage signal V exceeds the preset value V1, the controller controls the negative ion generator 21 to turn on, controls the drive motor 23 to open the fresh air valve 24, and controls the fresh air motor 22 to run at speed v1 to introduce outdoor air into the room. In other words, when the voltage signal V received by the controller 30 is greater than the preset voltage signal V1, i.e., the indoor pollutant concentration or carbon dioxide concentration exceeds the set value, the controller 30 first controls the negative ion generator 21 to purify the indoor air. Then, the controller 30 controls the drive motor 23 to open the fresh air valve 24, thus connecting the indoor and outdoor environments. Finally, the controller 30 controls the fresh air motor 22 to start and run at speed v1, thereby introducing outdoor air into the room, achieving air exchange between the indoor and outdoor air, and reducing the concentration of pollutants or carbon dioxide in the indoor air.

[0048] S12. When the voltage signal V does not exceed the preset value V1, the negative ion generator 21 is not turned on, the fresh air motor 22 is not operated, and the fresh air valve 24 is not opened. In other words, when the indoor pollutant concentration or carbon dioxide concentration is within the normal range, there is no need for air exchange between the indoor and outdoor environments. The negative ion generator 21, fresh air motor 22, and drive motor 23 do not need to be turned on. Naturally, the fresh air valve 24 remains closed, thus reducing unnecessary energy consumption by the negative ion generator 21, fresh air motor 22, and drive motor 23.

[0049] Therefore, by detecting the pressure difference between indoor and outdoor air through a micro-pressure sensor, the indoor air quality can be reflected. Moreover, the controller 30 can control the negative ion generator 21, the fresh air motor 22, and the drive motor 23 based on the results detected by the micro-pressure sensor. This allows for the exchange of outdoor and indoor air when the indoor pollutant concentration or carbon dioxide concentration exceeds the set value, thereby reducing the indoor pollutant concentration or carbon dioxide concentration. When the indoor pollutant concentration or carbon dioxide concentration is within the normal range, unnecessary energy consumption of the negative ion generator 21, the fresh air motor 22, and the drive motor 23 can be reduced.

[0050] In addition, such as Figure 4 As shown, after step S11, the controller 30 is further configured to:

[0051] S2. After time T1, determine whether the voltage signal V output by the differential pressure sensor 40 has decreased. That is, after the controller 30 controls the fresh air motor 22 to run at speed v1 for time T1, it is necessary to use the differential pressure sensor 40 to re-determine the pressure difference between indoor air and outdoor air, specifically to determine whether the voltage signal V output by the differential pressure sensor 40 has decreased.

[0052] S21. If so, the fresh air motor 22 is controlled to continue operating at speed v1 until the voltage signal V does not exceed the preset value V1. Then, the negative ion generator 21 is controlled to turn off, the fresh air motor 22 is controlled to stop operating, and the drive motor 23 is controlled to drive the fresh air valve 24 to close. That is, when the voltage signal V output by the micro-differential pressure sensor 40 to the controller 30 decreases after the fresh air motor 22 has been operating at speed v1 for time T1, and the voltage signal V is still greater than V1, the controller 30 will control the fresh air motor 22 to continue operating at speed v1, that is, to continue the exchange between outdoor and indoor air. In this way, the voltage signal V output by the micro-differential pressure sensor 40 will gradually decrease until the voltage signal V output by the micro-differential pressure sensor 40 does not exceed the preset value V1, that is, the concentration of pollutants or carbon dioxide in the room is reduced to a suitable range. At this time, the controller 30 will first control the negative ion generator 21 to close, stop the purification of indoor air, and control the fresh air motor 22 to stop operating. Then, it will control the drive motor 23 to drive the fresh air valve 24 to close, thus completing the purification process of indoor air.

[0053] Among them, such as Figure 4 As shown, controller 30 is also configured to:

[0054] S22. After time T1, if it is determined that the voltage signal V output by the micro differential pressure sensor 40 has not decreased, then the fresh air motor 22 is controlled to operate at a speed v2, where v2 > v1. That is, when the voltage signal V output by the micro differential pressure sensor 40 to the controller 30 after the fresh air motor 22 has been running at a speed v1 for time T1 has not decreased, and of course, the voltage signal V is greater than the preset value V1, the indoor pollutant concentration or carbon dioxide concentration still exceeds the appropriate range, the controller 30 will control the fresh air motor 22 to operate at a speed of v2. Since v2 is greater than v1, the fresh air motor 22 will rotate at a faster speed, thereby accelerating the exchange rate between outdoor and indoor air and reducing the indoor pollutant concentration or carbon dioxide concentration.

[0055] In addition, such as Figure 4 As shown, controller 30 is also configured to:

[0056] S3. After the fresh air motor 22 runs at speed v2 for time T1, determine whether the voltage signal V output by the differential pressure sensor 40 has decreased. That is, after the controller 30 controls the fresh air motor 22 to run at speed v2 for time T1, it is necessary to use the differential pressure sensor 40 to re-determine the pressure difference between indoor and outdoor air, specifically to determine whether the voltage signal V output by the differential pressure sensor 40 has decreased.

[0057] S31. If so, the fresh air motor 22 is controlled to continue operating at speed v2 until the voltage signal V does not exceed the preset value V1. Then, the negative ion generator 21 is controlled to turn off, the fresh air motor 22 is controlled to stop operating, and the drive motor 23 is controlled to drive the fresh air valve 24 to close. Similarly, when the voltage signal V output by the micro-differential pressure sensor 40 to the controller 30 decreases after the fresh air motor 22 has been operating at speed v2 for time T1, and the voltage signal V is still greater than V1, the controller 30 will control the fresh air motor 22 to continue operating at speed v2, that is, to continue the exchange between outdoor and indoor air. In this way, the voltage signal V output by the micro-differential pressure sensor 40 will gradually decrease until the voltage signal V output by the micro-differential pressure sensor 40 does not exceed the preset value V1, that is, the concentration of pollutants or carbon dioxide in the room is reduced to a suitable range. At this time, the controller 30 will first control the negative ion generator 21 to close, stop the purification of indoor air, and control the fresh air motor 22 to stop operating. Then, it will control the drive motor 23 to drive the fresh air valve 24 to close, thus completing the purification process of indoor air.

[0058] Furthermore, such as Figure 4 As shown, controller 30 is also configured to:

[0059] S32. After controlling the fresh air motor 22 to run at speed v2 for T1, if it is determined that the voltage signal V output by the micro differential pressure sensor 40 has not decreased, then the fresh air motor 22 is controlled to run at speed v3, where v3 > v2. That is to say, when the voltage signal V output by the micro differential pressure sensor 40 to the controller 30 after the fresh air motor 22 has run at speed v2 for T1 has not decreased, of course, the voltage signal V at this time is greater than the preset value V1, and the indoor pollutant concentration or carbon dioxide concentration still exceeds the appropriate range, the controller 30 will control the fresh air motor 22 to run at speed v3. Since v3 is greater than v2, the fresh air motor 22 will rotate at a speed faster than v2, thereby further accelerating the exchange speed between outdoor air and indoor air, so as to reduce the indoor pollutant concentration or carbon dioxide concentration.

[0060] Of course, such as Figure 4 As shown, controller 30 is also configured to:

[0061] S4. Determine whether the time T during which the fresh air motor 22 operates at speed v3 exceeds the preset time threshold T2. In other words, after the controller 30 controls the fresh air motor 22 to operate at speed v3 for a certain period, it is necessary to determine whether the time T during which the fresh air motor 22 operates at speed v3 has exceeded the preset time threshold T2. It should be noted that if the fresh air motor 22 operates at speed v3 for too long, the temperature of the outdoor fresh air will have a certain impact on the indoor temperature, thus affecting the user's experience.

[0062] S41. When the time T does not exceed the preset time threshold T2, determine whether the voltage signal V output by the micro differential pressure sensor 40 exceeds the preset value V1. When the fresh air motor 22 runs at speed v3 for a time T that does not exceed the preset time threshold T2, the temperature of the outdoor fresh air has a relatively small impact on the indoor temperature, and the next step of judgment can be performed, namely, whether the voltage signal V output by the micro differential pressure sensor 40 exceeds the preset value V1.

[0063] S411. When the voltage signal V does not exceed the preset value V1, the controller shuts off the negative ion generator 21, stops the fresh air motor 22, and drives the drive motor 23 to close the fresh air valve 24. Understandably, when the voltage signal V output by the micro-differential pressure sensor 40 does not exceed the preset value V1, meaning the indoor pollutant concentration or carbon dioxide concentration is within the normal range and there is no need for indoor-outdoor air exchange, the controller 30 first shuts off the negative ion generator 21 to stop indoor air purification, and stops the fresh air motor 22. Then, it controls the drive motor 23 to close the fresh air valve 24, thus completing the indoor air purification process.

[0064] S412. When the voltage signal V exceeds the preset value V1, the fresh air motor 22 is controlled to continue operating at a speed of v3. When the voltage signal V output by the micro differential pressure sensor 40 exceeds the preset value V1, that is, the indoor pollutant concentration or carbon dioxide concentration exceeds the normal range, it is necessary to continue to ventilate the room with fresh air. The controller 30 will control the fresh air motor 22 to continue operating at a speed of v3, thereby continuing to allow outdoor air and indoor air to circulate rapidly, which can better reduce the indoor pollutant concentration or carbon dioxide concentration.

[0065] Correspondingly, such as Figure 4 As shown, controller 30 is also configured to:

[0066] S42. When time T exceeds the preset time threshold T2, control the negative ion generator 21 to turn off, control the fresh air motor 22 to stop running, and control the drive motor 23 to drive the fresh air valve 24 to close. After the time for controlling the negative ion generator 21 to turn off, controlling the fresh air motor 22 to stop running, and controlling the drive motor 23 to drive the fresh air valve 24 to close reaches time T3, control the negative ion generator 21 to turn on, control the drive motor 23 to drive the fresh air valve 24 to open, and control the fresh air motor 22 to run at speed v3.

[0067] In other words, when the fresh air motor 22 operates at speed v3 for a time T exceeding the preset time threshold T2, meaning the high-speed operation of the fresh air motor 22 is prolonged, the outdoor fresh air temperature will affect the indoor temperature, thus impacting the user experience. At this point, the controller 30 will first shut down the negative ion generator 21 to stop purifying the indoor air and stop the fresh air motor 22. Then, it will control the drive motor 23 to close the fresh air valve 24, pausing the exchange of indoor and outdoor air to restore the indoor temperature. After the pause in the air exchange reaches time T3, the controller 30 will restart the negative ion generator 21 to purify the indoor air, and control the drive motor 23 to open the fresh air valve 24. Then, it will control the fresh air motor 22 to run at speed v3, thus restarting the exchange of outdoor and indoor air and ensuring indoor air quality.

[0068] In addition, such as Figure 4 As shown, controller 30 is also configured to:

[0069] S5. Determine whether the continuous operation time of the fresh air motor 22 at speed V3 reaches the time threshold T4, where T4 > T2. That is, after the controller 30 controls the fresh air motor 22 to continue operating at speed v3 multiple times, whether the total operating time of the fresh air motor 22 exceeds the time threshold T4. For example, if the time threshold T4 is the time it takes for the fresh air motor 22 to operate continuously at speed v3 three times, then the number of times the fresh air motor 22 operates continuously at speed v3 cannot exceed three times. This also helps to prevent the outdoor fresh air temperature from affecting the indoor temperature, thus impacting the user experience. Of course, the time threshold T4 for continuous operation of the fresh air motor 22 at speed v3 must be longer than the time threshold T2 for a single operation.

[0070] S51. If so, then control the negative ion generator 21 to turn off, control the fresh air motor 22 to stop running, and control the drive motor 23 to drive the fresh air valve 24 to close. That is to say, when the fresh air motor 22 runs continuously at speed v3 for a time threshold T4, it needs to be forcibly stopped. The controller 30 will first control the negative ion generator 21 to turn off, the negative ion generator 21 will stop purifying the indoor air, and the controller 30 will control the fresh air motor 22 to stop running. Then, it will control the drive motor 23 to drive the fresh air valve 24 to close. At this time, the outdoor air and the indoor air are isolated, and the exchange between indoor and outdoor air is suspended in order to restore the indoor temperature.

[0071] Correspondingly, such as Figure 4 As shown, controller 30 is also configured to:

[0072] S52. If the fresh air motor 22 operates continuously at speed V3 for less than the time threshold T4, then it is determined whether the voltage signal V output by the micro differential pressure sensor 40 exceeds the preset value V1. In other words, when the total operating time of the fresh air motor 22 does not exceed the time threshold T4, the outdoor fresh air temperature has a relatively small impact on the indoor temperature. The voltage signal V output by the micro differential pressure sensor 40 can be judged again, specifically whether the voltage signal V output by the micro differential pressure sensor 40 exceeds the preset value V1, that is, whether the concentration of indoor pollutants or carbon dioxide is within the normal range.

[0073] S521. When the voltage signal V does not exceed the preset value V1, the controller 30 controls the negative ion generator 21 to turn off, the fresh air motor 22 to stop running, and the drive motor 23 to drive the fresh air valve 24 to close. When the voltage signal V does not exceed the preset value V1, that is, when the concentration of indoor pollutants and carbon dioxide is within the normal range, there is no need to ventilate the room. At this time, the controller 30 will first control the negative ion generator 21 to turn off, so that the negative ion generator 21 stops purifying the indoor air. The controller 30 will also control the fresh air motor 22 to stop running, and then control the drive motor 23 to drive the fresh air valve 24 to close, thus completing the indoor air purification process.

[0074] S522. When the voltage signal V exceeds the preset value V1, the controller 30 will control the fresh air motor 22 to maintain operation at a speed of v3. When the voltage signal V output by the micro differential pressure sensor 40 exceeds the preset value V1, that is, the concentration of indoor pollutants and carbon dioxide is still high, the controller 30 will control the fresh air motor 22 to maintain operation at a speed of v3, so that outdoor air and indoor air can circulate quickly, thereby better reducing the concentration of indoor pollutants or carbon dioxide.

[0075] Of course, such as Figure 4As shown, controller 30 is also configured to:

[0076] The voltage signal V output by the micro-differential pressure sensor 40 is periodically acquired over a period of time T5. Based on the relationship between the voltage signal V and the preset value V1, the operating status of the negative ion generator 21, the fresh air valve 24, and the fresh air motor 22 are periodically controlled. In other words, the indoor air can be periodically exchanged to keep the concentration of indoor pollutants and carbon dioxide within a reasonable range. Each cycle lasts for T5. During each cycle, the voltage signal V output by the micro-differential pressure sensor 40 is compared with the preset value V1. Based on the relationship between the voltage signal V output by the micro-differential pressure sensor 40 and the preset value V1, the controller 30 controls the operating status of the negative ion generator 21, the fresh air valve 24, and the fresh air motor 22, thereby achieving automatic adjustment of indoor air.

[0077] In addition, such as Figures 1-3 As shown, the fresh air module 20 can be installed at the lower part of the air conditioner 1. The fresh air module 20 mainly includes: a fresh air motor 22, a fresh air fan, a fan casing, a drive motor 23, a fresh air valve 24, a fresh air duct socket 50, a fresh air duct, a fresh air filter, and a micro-differential pressure sensor 40. The fresh air duct socket 50 is used to connect the fresh air duct to the outside. The fresh air valve 24 is in the shape of a large fan and is installed at the fresh air inlet. The fresh air valve 24 is driven by the drive motor 23, and the entry of outdoor air is controlled by controlling the opening and closing of the fresh air valve 24. The fresh air inlet baffle 60 is in the shape of a small fan and, together with the large fan-shaped fresh air valve 24, forms a complete circle to close the air inlet. A micro differential pressure sensor is installed inside the small fan-shaped fresh air inlet baffle 60. The high-pressure chamber pressure tap 44 of the micro differential pressure sensor 40 extends through an air pipe to the fresh air outlet 70, which is connected to the indoor air. The low-pressure chamber pressure tap 45 of the micro differential pressure sensor 40 is connected through an air pipe to the connecting hole 61 on the fresh air inlet baffle 60, which is connected to the outdoor air connected to the fresh air duct.

[0078] It should be noted that the output of the micro differential pressure sensor 40 can also be a digital signal, which can be transmitted to the controller 30 through one-way or two-way communication. The shape of the fresh air valve 24 and the shape of the fresh air inlet baffle 60 can also be other shapes, as long as the air inlet is closed. In addition, the fresh air outlet 70 can also be located in front of or on the side of the air conditioner.

[0079] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0080] In the description of this invention, "first feature" and "second feature" may include one or more of the features. In the description of this invention, "a plurality of" means two or more. In the description of this invention, "above" or "below" the second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them. In the description of this invention, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0081] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0082] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that, The air conditioner includes: case; The fresh air module is disposed inside the housing and includes: a negative ion generator, a fresh air motor, a drive motor, and a fresh air valve. The drive motor is connected to the fresh air valve and is used to drive the fresh air valve to open or close. The fresh air module is used to introduce outdoor fresh air into the room to realize indoor and outdoor air exchange. A micro differential pressure sensor, disposed on the housing, is used to sense the pressure difference between indoor and outdoor air and output a voltage signal proportional to the pressure difference. The micro differential pressure sensor includes a printed circuit board and interface terminals. The interface terminals are connected to the indoor main control board via a wiring harness. The micro differential pressure sensor also includes a microelectromechanical system (MEMS), which is surface-mount packaged and soldered to the printed circuit board. The micro differential pressure sensor also includes a high-pressure chamber pressure tap and a low-pressure chamber pressure tap. The high-pressure chamber pressure tap is connected to the indoor air via an air tube to sense the indoor air pressure, and the low-pressure chamber pressure tap is connected to the outdoor air via an air tube to sense the outdoor air pressure. The controller is configured as follows: Obtain the voltage signal V output by the micro differential pressure sensor; When it is determined that the voltage signal V exceeds the preset value V1, the negative ion generator is turned on, the drive motor is driven to open the fresh air valve, and the fresh air motor is controlled to run at a speed v1 to introduce outdoor air into the room. When it is determined that the voltage signal V does not exceed the preset value V1, the negative ion generator is controlled not to turn on, the fresh air motor is controlled not to run, and the fresh air valve is controlled not to open. Specifically, after controlling the negative ion generator to turn on, controlling the drive motor to open the fresh air valve, and controlling the fresh air motor to operate at speed v1, the controller is further configured to: After time T1, determine whether the voltage signal V output by the micro differential pressure sensor has decreased; If so, the fresh air motor is controlled to continue operating at a speed of v1 until the voltage signal V does not exceed the preset value V1. Then, the negative ion generator is controlled to turn off, the fresh air motor is controlled to stop operating, and the drive motor is controlled to drive the fresh air valve to close. After time T1, if it is determined that the voltage signal V output by the micro differential pressure sensor has not decreased, then the fresh air motor is controlled to operate at a speed v2, where v2 > v1.

2. The air conditioner according to claim 1, characterized in that, The controller is also configured to: After the fresh air motor is controlled to run at a speed of v2 for a time of T1, it is determined whether the voltage signal V output by the micro differential pressure sensor has decreased. If so, the fresh air motor is controlled to continue operating at a speed of v2 until the voltage signal V does not exceed the preset value V1. Then, the negative ion generator is controlled to turn off, the fresh air motor is controlled to stop operating, and the drive motor is controlled to drive the fresh air valve to close.

3. The air conditioner according to claim 2, characterized in that, The controller is also configured to: After controlling the fresh air motor to run at speed v2 for T1, if it is determined that the voltage signal V output by the micro differential pressure sensor has not decreased, then the fresh air motor is controlled to run at speed v3, where v3 > v2.

4. The air conditioner according to claim 3, characterized in that, The controller is also configured to: Determine whether the time T during which the fresh air motor runs at speed v3 exceeds a preset time threshold T2; When the time T does not exceed the preset time threshold T2, determine whether the voltage signal V output by the micro differential pressure sensor exceeds the preset value V1; When the voltage signal V does not exceed the preset value V1, the negative ion generator is controlled to turn off, the fresh air motor is controlled to stop running, and the drive motor is controlled to drive the fresh air valve to close. When the voltage signal V exceeds the preset value V1, the fresh air motor is controlled to continue operating at a speed of v3.

5. The air conditioner according to claim 4, characterized in that, The controller is also configured to: When time T exceeds the preset time threshold T2, the negative ion generator is controlled to turn off, the fresh air motor is controlled to stop running, and the drive motor is controlled to drive the fresh air valve to close. After the time T3 of controlling the negative ion generator to turn off, controlling the fresh air motor to stop running, and controlling the drive motor to drive the fresh air valve to close reaches time T3, the negative ion generator is controlled to turn on, the drive motor is controlled to drive the fresh air valve to open, and the fresh air motor is controlled to run at a speed v3.

6. The air conditioner according to claim 5, characterized in that, The controller is also configured to: Determine whether the time during which the fresh air motor continuously operates at speed V3 reaches the time threshold T4, where T4>T2; If so, then control the negative ion generator to turn off, control the fresh air motor to stop running, and control the drive motor to drive the fresh air valve to close.

7. The air conditioner according to claim 6, characterized in that, The controller is also configured to: If the time for which the fresh air motor runs continuously at speed V3 does not reach the time threshold T4, then it is determined whether the voltage signal V output by the micro differential pressure sensor exceeds the preset value V1. When the voltage signal V does not exceed the preset value V1, the negative ion generator is controlled to turn off, the fresh air motor is controlled to stop running, and the drive motor is controlled to drive the fresh air valve to close. When the voltage signal V exceeds the preset value V1, the fresh air motor is controlled to continue operating at a speed v3.

8. The air conditioner according to claim 6, characterized in that, The controller is also configured to: The voltage signal V output by the micro differential pressure sensor is periodically acquired with time T5 as the period, and the operating status of the negative ion generator, the fresh air valve and the fresh air motor are periodically controlled according to the relationship between the voltage signal V and the preset value V1.

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