Air care fan

Abstract

This application provides an air conditioning fan with a cool air mode and a hot air mode. It includes a housing, a fan wheel, a temperature sensor, and a negative ion generator. The housing has an air inlet and an air outlet. The fan wheel is rotatably mounted inside the housing and includes several heating blades. These blades are electrically connected in hot air mode to generate heat and electrically disconnected in cool air mode. The temperature sensor detects the temperature. The negative ion generator is located on the air inlet side of the air outlet. In cool air mode, the negative ion generator generates a first concentration of negative ions. When the negative ion generator is in hot air mode and the detected temperature is higher than a preset temperature, it generates a second concentration of negative ions, where the first concentration is higher than the second concentration. This application uses a temperature sensor to detect the temperature. In hot air mode, when the detected temperature is higher than the preset temperature, the negative ion output concentration is reduced, resulting in a higher negative ion concentration in cool air mode compared to hot air mode, thus achieving differentiated control.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more particularly to an air conditioning fan. Background Technology

[0002] As people's demands for indoor air quality and thermal comfort continue to increase, air conditioning fans that combine air supply, heating, and air purification functions are gradually gaining attention. In existing technologies, the heating and negative ion purification functions are usually implemented by independent modules. However, their structural layout lacks coordinated design, and their control logic is separate. Specifically, the installation location of the negative ion generator does not fully consider the airflow temperature distribution under hot air conditions, making it prone to performance degradation due to high temperatures. Simultaneously, the negative ion output power cannot be adjusted in conjunction with the real-time temperature of the heating element; the same output strategy is used for both cool and hot air conditions, and there is a lack of a dynamic correlation mechanism between the heating power of the electric heating blades and the negative ion output power, making it difficult to balance thermal comfort and purification effects in different modes. Summary of the Invention

[0003] This application provides an air care fan that, by placing a negative ion generator on the air inlet side of the air outlet grille and maintaining a distance between the impeller and the negative ion generator, ensures that the temperature of the airflow passing through the negative ion generator in hot air mode does not exceed a preset safe temperature; at the same time, by detecting the temperature with a temperature sensor, the negative ion output concentration is reduced when the detected temperature is higher than the preset temperature in hot air mode, so that the negative ion concentration in cool air mode is higher than that in hot air mode, thus achieving differentiated control.

[0004] In a first aspect, embodiments of this application provide an air conditioning fan with a cool air mode and a hot air mode. The air conditioning fan includes a housing, a fan wheel, a temperature sensor, and a negative ion generator. The housing has an air inlet and an air outlet grille. The fan wheel is rotatably disposed within the housing and includes a plurality of electric heating blades. The plurality of electric heating blades are electrically connected to generate heat in the hot air mode and electrically disconnected in the cool air mode. The temperature sensor is used to detect the temperature. The negative ion generator is disposed on the air inlet side of the air outlet grille. The negative ion generator generates a first concentration of negative ions in the cool air mode. When the negative ion generator is in the hot air mode and the detected temperature is higher than a preset temperature, the negative ion generator generates a second concentration of negative ions, wherein the first concentration is higher than the second concentration.

[0005] The aforementioned air conditioning fan limits the airflow temperature passing through the negative ion generator in hot air mode by limiting the distance between the impeller and the negative ion generator, thus reducing the adverse effects of high temperatures on the negative ion release effect and device lifespan. In hot air mode, a temperature sensor reduces the negative ion concentration when the detected temperature exceeds a preset temperature, achieving differentiated output between cool and hot air modes and avoiding energy waste and ozone risks caused by excessive negative ions in hot air operation. Furthermore, in hot air mode, the heating power is adjusted according to the temperature of the electric heating blades to maintain a constant temperature, and the negative ion output power and heating power are inversely linked, ensuring thermal comfort while maintaining a reasonable purification level, improving overall energy efficiency and user experience. Attached Figure Description

[0006] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0007] Figure 1 This is a schematic diagram of the structure of the air care fan provided in the embodiment of this application.

[0008] Figure 2 This is a structural block diagram of a high-voltage boost circuit provided in an embodiment of this application.

[0009] The following are the labels in the diagram: 100-Air care fan; 1-Housing; 11-Air inlet; 12-Air outlet grille; 13-Air inlet channel; 14-Air outlet channel; 2-Ignition wheel; 21-Heating blades; 22-Motor; 3-Temperature sensor; 31-First temperature sensor; 32-Second temperature sensor; 4-Negative ion generator; 41-High voltage boost circuit; 411-PWM drive module; 412-Boost transformer module; 413-High voltage rectifier module; 414-High voltage filter module; 42-Discharge needle; 43-High voltage electrode; 5-Controller.

[0010] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0012] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar planned objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data are interchangeable where appropriate; in other words, the described embodiments are implemented according to a sequence other than that illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, may also include other content; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0013] It should be noted that the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0014] This application provides an air conditioning fan 100. The air conditioning fan 100 has a cool air mode and a hot air mode. In cool air mode, the air conditioning fan 100 blows out air at room temperature; in hot air mode, the air conditioning fan 100 heats the airflow and then blows out warm air. Please refer to [link / reference]. Figure 1 and Figure 2 The air care fan 100 includes a housing 1, a fan wheel 2, a temperature sensor 3, and a negative ion generator 4.

[0015] The housing 1 has an air inlet 11 and an air outlet grille 12. The housing 1 is generally cylindrical; in this embodiment, the housing 1 has an overall vertical columnar structure. The air inlet 11 is located at one axial end of the housing 1 (such as the back or bottom surface), and the air outlet grille 12 is located at the other axial end of the housing 1 (such as the front or top surface), i.e., the air inlet 11 and the air outlet grille 12 are arranged opposite to each other. A filter screen (not shown) is detachably installed at the air inlet 11. The filter screen is fixed to the housing 1 by a snap or magnetic attraction, making it easy for the user to remove and replace it regularly. The air outlet grille 12 is composed of multiple grille strips, which both guide the airflow and prevent foreign objects from entering the interior of the housing 1. An air inlet channel 13 and an air outlet channel 14 are formed sequentially along the airflow direction inside the housing 1. The area between the air inlet 11 and the impeller 2 forms the air inlet channel 13, and the area between the impeller 2 and the air outlet grille 12 forms the air outlet channel 14. Airflow enters from the air inlet 11, flows through the air inlet channel 13 and the impeller 2, then enters the air outlet channel 14, and finally exits through the air outlet grille 12.

[0016] The impeller 2 is rotatably mounted within the housing 1, located between the air inlet channel 13 and the air outlet channel 14. In this embodiment, the impeller 2 is a cross-flow impeller, including a hub and a plurality of electric heating blades 21 evenly distributed circumferentially along the hub. The electric heating blades 21 extend axially along the hub, allowing airflow to enter axially along the air inlet channel 13 and exit radially along the air outlet channel 14, achieving a large air volume within a small radial space. The plurality of electric heating blades 21 are spaced apart circumferentially. The surface of each electric heating blade 21 is covered with an electric heating layer (not shown), which is a thick film heating layer, formed by printing conductive paste onto the surface of the electric heating blade 21 through a screen printing process and then sintering and curing at high temperature. An insulating underlayer (not shown) is also provided between the electric heating layer and the electric heating blades 21 to prevent leakage and ensure electrical safety. In hot air mode, the heating layers of several electric heating blades 21 are electrically connected to generate heat. The heat is conducted through the electric heating blades 21 to the airflow flowing over their surface, thereby achieving warm air output. In cool air mode, the heating layers of several electric heating blades 21 are electrically disconnected, and the airflow is only accelerated by the impeller 2 without being heated, thereby achieving cool air output.

[0017] Furthermore, the impeller 2 also includes a motor 22. The motor 22 is coaxially connected to the hub of the impeller 2 and is used to drive the impeller 2 to rotate. In this embodiment, the motor 22 is a DC brushless motor, which has the advantages of wide speed range, high efficiency, and low noise; in other embodiments, the motor 22 may also be a single-phase asynchronous motor or other types of motors, and this application does not limit this. The air conditioning fan 100 also includes a blade power supply circuit (not shown) and a conductive connector (not shown). The blade power supply circuit is used to supply power to the electric heating layer. The conductive connector includes a slip ring and a conductive brush. The slip ring is fixed on the rotating shaft of the motor 22 and rotates synchronously with the motor 22. The conductive brush is fixed inside the housing 1 and slides in contact with the slip ring. In this embodiment, the conductive brush can be made of carbon brush or metal brush. The blade power supply circuit supplies electrical energy to the electric heating layer through the conductive brush and slip ring, ensuring that the electric heating layer continuously receives a stable power supply while rotating.

[0018] Temperature sensor 3 is used to detect temperature. In one embodiment, temperature sensor 3 includes a first temperature sensor 31 and a second temperature sensor 32. The first temperature sensor 31 detects the temperature of several heating blades 21 to obtain the real-time operating status of the heating blades 21. In this embodiment, the first temperature sensor 31 can be an NTC thermistor attached to the surface of the heating blades 21 or embedded inside the heating blades 21, collecting the temperature of the heating blades 21 in real time and feeding it back to the controller 5. The second temperature sensor 32 is located at the air outlet grille 12, or between the air outlet grille 12 and the negative ion generator 4, and is used to detect the temperature of the airflow passing through the negative ion generator 4. In this embodiment, the second temperature sensor 32 can be an NTC thermistor or a thermocouple, installed on the grille bars of the air outlet grille 12 or on the airflow path between the negative ion generator 4 and the air outlet grille 12. The airflow temperature detected by the second temperature sensor 32 reflects the thermal state of the actual working environment of the negative ion generator 4, complementing the temperature of the heating blades 21 detected by the first temperature sensor 31.

[0019] The negative ion generator 4 is located on the air inlet side of the air outlet grille 12, that is, the negative ion generator 4 is located inside the air outlet channel 14, upstream of the air outlet grille 12. The negative ion generator 4 includes a discharge needle 42 and a high-voltage electrode 43. The discharge needle 42 is positioned facing the air outlet grille 12, and a discharge gap is formed between the high-voltage electrode 43 and the discharge needle 42. The discharge gap extends along the airflow direction of the air outlet channel 14. The airflow carrying negative ions flows along the air outlet channel 14 to the air outlet grille 12 and is then delivered out of the housing 1. In this embodiment, the discharge needles 42 are uniformly arranged along the airflow direction of the air outlet channel 14; in other embodiments, the discharge needles 42 may also be arranged in a planar array or other forms, which is not limited in this application.

[0020] A gap exists between the impeller 2 and the negative ion generator 4. This gap is the shortest straight-line distance between the surface of the negative ion generator 4 facing the impeller 2 and the outermost trajectory surface of the impeller 2 during rotation. This gap ensures a mechanical safety clearance between the negative ion generator 4 and the rotating impeller 2, preventing operational interference. Furthermore, in hot air mode, when the heat released from the heating blades 21 is carried by the airflow to the area where the negative ion generator 4 is located, the airflow temperature has sufficiently decreased, ensuring that the airflow temperature flowing through the negative ion generator 4 does not exceed a preset safe temperature. This reduces the adverse effects of high temperatures on the negative ion release effect and the device's lifespan. In this embodiment, the gap ranges from 5mm to 20mm, preferably from 8mm to 12mm.

[0021] Negative ion generator 4 produces a first concentration of negative ions in cool air mode. In hot air mode, when the detected temperature is higher than a preset temperature, negative ion generator 4 produces a second concentration of negative ions, with the first concentration being higher than the second concentration. Accordingly, the output power of negative ion generator 4 in cool air mode is higher than its output power in hot air mode.

[0022] Specifically, in hot air mode, when the temperature detected by temperature sensor 3 reaches the preset temperature, the output power of negative ion generator 4 is lower than that in cool air mode. When the temperature detected by temperature sensor 3 does not reach the preset temperature, the output power of negative ion generator 4 is the same as that in cool air mode. When using the first temperature sensor 31, in hot air mode, when the temperature of the heating blade 21 detected by the first temperature sensor 31 reaches the preset temperature, the output power of negative ion generator 4 is lower than that in cool air mode. When the temperature of the heating blade 21 detected by the first temperature sensor 31 does not reach the preset temperature, the output power of negative ion generator 4 is the same as that in cool air mode. The output power of negative ion generator 4 is also adjusted according to the airflow temperature detected by the second temperature sensor 32.

[0023] In one implementation, the temperature detection, comparison, and power adjustment described above can be achieved through a controller 5. The controller 5 is electrically connected to several heating blades 21, a temperature sensor 3, and a negative ion generator 4. In this embodiment, the controller 5 can be an MCU, a DSP, or a dedicated control chip, which internally stores parameters such as a preset temperature, a preset temperature range, and the standard output power of the negative ion generator 4 in each mode. The controller 5 receives the detection signal from the temperature sensor 3 and adjusts the output power of the negative ion generator 4 based on the comparison result between the detection signal and the preset temperature.

[0024] The negative ion generator 4 also includes a high-voltage boost circuit 41. The output power of the negative ion generator 4 is adjusted by regulating the duty cycle of the PWM signal input to the high-voltage boost circuit 41. Specifically, when the duty cycle increases, the output voltage of the high-voltage boost circuit 41 increases, and the output power of the negative ion generator 4 increases; when the duty cycle decreases, the output voltage decreases, and the output power decreases.

[0025] More specifically, the high-voltage boost circuit 41 includes a PWM drive module 411, a boost transformer module 412, a high-voltage rectifier module 413, and a high-voltage filter module 414. The PWM drive module 411 receives the PWM signal output from the controller 5 and converts it into a switching drive signal suitable for driving the boost transformer module 412. The boost transformer module 412 boosts the low-voltage DC power into high-frequency high-voltage AC power according to the switching drive signal. The high-voltage rectifier module 413 rectifies the high-frequency high-voltage AC power output from the boost transformer module 412 to obtain pulsating DC high voltage. The high-voltage filter module 414 filters and smooths the pulsating DC high voltage, outputting a stable DC high voltage to the discharge gap between the discharge needle 42 and the high-voltage electrode 43 to maintain stable corona discharge and generate negative ions. By adjusting the duty cycle of the PWM signal received by the PWM drive module 411, the energy transferred by the boost transformer module 412 can be continuously adjusted, thereby achieving precise control of the output power of the negative ion generator 4.

[0026] Understandably, the adjustment of negative ion concentration is not limited to adjusting the duty cycle of the PWM signal. In other implementations, it can also be achieved through the following methods. (1) When there are multiple discharge needles 42, the multiple discharge needles 42 can be divided into several groups along the airflow direction of the air outlet channel 14. The controller 5 selectively enables some or all of the groups of discharge needles 42 to participate in corona discharge according to the required negative ion concentration, thereby changing the effective discharge area under the premise that the single needle discharge intensity remains unchanged, and realizing the stepwise adjustment of negative ion concentration. (2) When two or more negative ion generators 4 are integrated in the housing 1 along the airflow direction of the air outlet channel 14, the controller 5 can selectively activate one or more of the negative ion generators 4 according to the operating mode and temperature conditions to match the negative ion demand under different working conditions. (3) The controller 5 can also change the flow rate of the airflow through the discharge area between the discharge needle 42 and the high voltage electrode 43 by adjusting the speed of the motor 22; when the output power of the negative ion generator 4 remains unchanged, reducing the speed of the impeller 2 can prolong the contact time between the airflow and the discharge area and increase the concentration of negative ions in the unit volume of airflow, and conversely, it will dilute the concentration of negative ions.

[0027] The above methods can be used alone or combined with PWM duty cycle adjustment to achieve more precise control of negative ion concentration.

[0028] In hot air mode, the heating power of several electric heating blades 21 is adjusted according to the temperature detected by the first temperature sensor 31 to maintain the temperature of the several electric heating blades 21 within a preset temperature range, achieving constant temperature output. Furthermore, the heating power of the several electric heating blades 21 is inversely linked to the output power of the negative ion generator 4. Specifically, when the heating power of the several electric heating blades 21 increases, the output power of the negative ion generator 4 decreases accordingly; when the heating power of the several electric heating blades 21 decreases, the output power of the negative ion generator 4 increases accordingly. Thus, the heating function and the negative ion purification function work synergistically during variable operating conditions, balancing thermal comfort and air purification effectiveness.

[0029] The following describes the working process of the air care fan 100 in both cool and hot air modes.

[0030] In cool air mode, several electric heating blades 21 are electrically disconnected, the fan wheel 2 rotates to draw in outside air and sends out ambient temperature airflow through the air outlet duct 14. The controller 5 controls the negative ion generator 4 to operate at a first concentration. Specifically, the controller 5 outputs a PWM signal with a high duty cycle to the PWM drive module 411, the high voltage boost circuit 41 outputs a high DC high voltage, and a strong corona discharge is generated between the discharge needle 42 and the high voltage electrode 43, so that the airflow carries a high concentration of negative ions.

[0031] After switching to hot air mode, several heating blades 21 become electrically conductive and begin to heat up. The controller 5 adjusts the heating power of the heating blades 21 based on the temperature detected by the first temperature sensor 31, maintaining the temperature of the heating blades 21 within a preset temperature range (e.g., 60℃-100℃). During this process: When the temperature detected by the first temperature sensor 31 does not reach the preset temperature, it indicates that the air outlet temperature has not yet reached the target warm air temperature. The controller 5 maintains the output power of the negative ion generator 4 at the same level as in the cool air mode, that is, releases negative ions at the first concentration to ensure that the air purification effect is not weakened during the heating phase.

[0032] When the temperature detected by the first temperature sensor 31 reaches or exceeds the preset temperature, it indicates that the outlet air temperature meets the heating requirements and there is a risk of overheating. The controller 5 reduces the duty cycle of the PWM signal input to the PWM drive module 411, and the output voltage of the high-voltage boost circuit 41 decreases accordingly. The negative ion generator 4 switches to the second concentration operation. Thus, while ensuring thermal comfort, the attenuation of negative ion release efficiency by high-temperature airflow is reduced, and the heat load on the discharge needle 42 and high-voltage electrode 43 is reduced.

[0033] Meanwhile, the second temperature sensor 32 continuously monitors the airflow temperature passing through the negative ion generator 4. If the airflow temperature detected by the second temperature sensor 32 rises abnormally and approaches the preset safe temperature, even if the temperature of the heating blade 21 detected by the first temperature sensor 31 has not yet reached the preset temperature, the controller 5 can further reduce the output power of the negative ion generator 4 or temporarily shut down the negative ion generator 4, and resume operation after the airflow temperature drops, thus providing dual temperature protection for the negative ion generator 4. The above-mentioned adjustment based on the second temperature sensor 32 and the adjustment based on the first temperature sensor 31 work together to avoid adjustment lag or over-adjustment caused by uneven temperature distribution in the air duct.

[0034] When the air care fan 100 switches from hot air mode back to cool air mode, several electric heating blades 21 are electrically disconnected, and the controller 5 restores the output power of the negative ion generator 4 to the output power corresponding to the first concentration, thus completing the mode switch.

[0035] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0036] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units through some interfaces, and may be electrical, mechanical, or other forms.

[0037] The unit described as a separate component may or may not be physically separate. The component shown as a unit may or may not be a physical unit; that is, it may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0038] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist independently, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0039] In the above embodiments, the airflow temperature passing through the negative ion generator in hot air mode is limited by the distance between the impeller and the negative ion generator, reducing the adverse effects of high temperature on the negative ion release effect and device lifespan. In hot air mode, when the detected temperature is higher than a preset temperature, the negative ion concentration is reduced by a temperature sensor, achieving differentiated output between cool and hot air modes, avoiding energy waste and ozone risks caused by excessive negative ions in hot air conditions. Furthermore, in hot air mode, the heating power is adjusted according to the temperature of the electric heating blades to maintain a constant temperature, and the negative ion output power and heating power are inversely linked, ensuring thermal comfort while maintaining a reasonable purification level, improving overall energy efficiency and user experience.

[0040] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0041] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0042] The above-listed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. An air conditioning fan, having a cool air mode and a hot air mode, characterized in that, The air care fan includes: The housing has an air inlet and an air outlet grille; A fan wheel is rotatably disposed within the housing. The fan wheel includes a plurality of electric heating blades, which are electrically connected to generate heat in the hot air mode and electrically disconnected in the cool air mode. Temperature sensor, used to detect temperature; A negative ion generator is located on the air inlet side of the air outlet grille. The negative ion generator generates a first concentration of negative ions in the cool air mode. When the negative ion generator is in hot air mode and the detected temperature is higher than a preset temperature, the negative ion generator generates a second concentration of negative ions, where the first concentration is higher than the second concentration.

2. The air conditioning fan as described in claim 1, characterized in that, The negative ion generator has a higher output power in the cool air mode than in the hot air mode.

3. The air conditioning fan as described in claim 2, characterized in that, In the hot air mode, when the temperature detected by the temperature sensor reaches the preset temperature, the output power of the negative ion generator is lower than that in the cool air mode; when the temperature detected by the temperature sensor does not reach the preset temperature, the output power of the negative ion generator is the same as that in the cool air mode.

4. The air conditioning fan as described in claim 1, characterized in that, The temperature sensor includes a first temperature sensor, which is used to detect the temperature of the plurality of electric heating blades; in the hot air mode, when the temperature detected by the first temperature sensor reaches a preset temperature, the output power of the negative ion generator is lower than the output power in the cool air mode. When the temperature detected by the first temperature sensor does not reach the preset temperature, the output power of the negative ion generator is the same as the output power in the cool breeze mode.

5. The air conditioning fan as described in claim 4, characterized in that, The temperature sensor also includes a second temperature sensor, which is located at the air outlet grille or between the air outlet grille and the negative ion generator, for detecting the temperature of the airflow passing through the negative ion generator; the output power of the negative ion generator is also adjusted according to the airflow temperature detected by the second temperature sensor.

6. The air conditioning fan as described in claim 4, characterized in that, In the hot air mode, the heating power of the plurality of electric heating blades is adjusted according to the temperature detected by the first temperature sensor so that the temperature of the plurality of electric heating blades is maintained within a preset temperature range.

7. The air conditioning fan as described in claim 6, characterized in that, When the heating power of several electric heating blades increases, the output power of the negative ion generator decreases accordingly; when the heating power of several electric heating blades decreases, the output power of the negative ion generator increases accordingly.

8. The air conditioning fan as described in claim 2, characterized in that, The negative ion generator includes a high-voltage boost circuit, and the output power of the negative ion generator is adjusted by regulating the duty cycle of the PWM signal input to the high-voltage boost circuit.

9. The air conditioning fan as described in claim 1, characterized in that, There is a gap between the impeller and the negative ion generator, and the gap ensures that the temperature of the airflow passing through the negative ion generator in the hot air mode does not exceed a preset safe temperature; an air inlet channel is formed between the air inlet and the impeller, and an air outlet channel is formed between the impeller and the air outlet grille, and the negative ion generator is located in the air outlet channel.

10. The air conditioning fan as described in claim 9, characterized in that, The negative ion generator also includes a discharge needle and a high-voltage electrode, the discharge needle being positioned toward the air outlet grille; a discharge gap is formed between the high-voltage electrode and the discharge needle, the discharge gap extending along the airflow direction of the air outlet channel.

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