Mobile air conditioner

Abstract

Embodiments of the present application provide a mobile air conditioner, comprising: a refrigerant circulation loop, which circulates refrigerant in a loop formed by a compressor, an outdoor heat exchanger, a throttling element, and an indoor heat exchanger connected in sequence; an indoor fan blade; an outdoor fan blade; a fan motor, which is used to synchronously drive the indoor fan blade and the outdoor fan blade to rotate; an ambient temperature sensor; a voltage detection module; and a controller, which is configured to perform the following steps: in a refrigeration mode operating state, obtaining an indoor ambient temperature detected by the ambient temperature sensor and an input voltage of the whole machine detected by the voltage detection module; determining whether the indoor ambient temperature and the input voltage of the whole machine simultaneously satisfy a preset trigger condition; and if the preset trigger condition is simultaneously satisfied, controlling the fan motor to operate a corresponding preset wind level. Embodiments of the present application can avoid the whole machine from being shut down due to low wind level operation in adverse working conditions without changing the inherent structure of a single fan motor, thereby ensuring the stability of refrigeration operation and user experience.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, specifically to a portable air conditioner. Background Technology

[0002] Portable air conditioners are air conditioners that can be moved around freely. As the application scenarios for portable air conditioners continue to expand, their operational stability under harsh working conditions and the optimization of user experience have become important research and development directions in the industry.

[0003] Currently, single-fan motor portable air conditioners, because the indoor and outdoor fans share the same motor and their speeds are forced to be synchronized, are prone to problems such as a sudden drop in the overall heat exchange efficiency and a surge in current when users mistakenly select the low-speed cooling mode under high temperature and low voltage conditions, which inevitably affects the user's normal user experience.

[0004] Therefore, how to avoid the problem of the whole machine stopping due to low fan speed operation under harsh conditions without changing the inherent structure of the single fan motor, and ensure the stability of cooling operation and user experience, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned problems and other issues.

[0006] The purpose of this invention is also to avoid the problem of the whole machine stopping due to low fan speed operation under harsh working conditions without changing the inherent structure of the single fan motor, thus ensuring the stability of cooling operation and user experience.

[0007] The purpose of this invention is not limited to the purposes mentioned above, and those skilled in the art will clearly understand other purposes not mentioned from the following description.

[0008] In some embodiments of this application, a portable air conditioner is provided, comprising:

[0009] The refrigerant circulation loop allows the refrigerant to circulate in a loop consisting of the compressor, outdoor heat exchanger, throttling element, and indoor heat exchanger connected in sequence. An indoor fan blade is located on the corresponding side of the indoor heat exchanger and is used to drive indoor air to flow through the indoor heat exchanger. An outdoor fan blade is located on the corresponding side of the outdoor heat exchanger and is used to drive outdoor air to flow through the outdoor heat exchanger. A fan motor is connected to the indoor fan blade and the outdoor fan blade respectively, and is used to synchronously drive the indoor fan blade and the outdoor fan blade to rotate; An ambient temperature sensor is used to detect indoor ambient temperature. The voltage detection module is used to detect the input voltage of the entire machine. The controller is electrically connected to the fan motor, the ambient temperature sensor, and the voltage detection module. The controller is configured to perform the following steps: In cooling mode, the indoor ambient temperature detected by the ambient temperature sensor and the overall input voltage detected by the voltage detection module are obtained. Determine whether the indoor ambient temperature and the unit input voltage simultaneously meet the preset triggering conditions; If the preset triggering conditions are met simultaneously, the fan motor is controlled to operate at the corresponding preset fan speed.

[0010] The above technical solution has the following advantages or beneficial effects: For a portable air conditioner with a single fan motor, in cooling mode, it simultaneously collects two parameters: indoor ambient temperature and unit input voltage. Using the simultaneous fulfillment of preset conditions as the trigger logic, it can accurately identify the combined severe operating conditions of high temperature and high load with low voltage, avoiding false intervention caused by triggering a single parameter and ensuring the accuracy of protection actions. When the trigger conditions are met, it actively controls the fan motor to operate at the corresponding preset fan speed, simultaneously enhancing the heat exchange efficiency between the indoor and outdoor heat exchangers by increasing the fan speed, reducing the condensing pressure of the refrigeration system and the compressor operating load, thereby suppressing the surge in unit power and current, fundamentally preventing overcurrent protection tripping, and ensuring the continuity and stability of cooling operation.

[0011] In some embodiments of this application, a portable air conditioner is provided, wherein the preset triggering conditions include a first preset condition and a second preset condition; the controller is further configured to perform the following steps: Determine whether the indoor ambient temperature and the overall machine input voltage simultaneously meet the first preset condition; If the first preset condition is met simultaneously, the fan motor is controlled to operate at the first fan speed. If the first preset condition is not met, then determine whether the indoor ambient temperature and the whole machine input voltage simultaneously meet the second preset condition; If the second preset condition is met simultaneously, the fan motor is controlled to operate at a speed not higher than the first wind speed.

[0012] The above technical solution has the following advantages or beneficial effects: the triggering conditions are divided into a first preset condition (more severe operating conditions) and a second preset condition (secondary severe operating conditions), which correspond to different levels of operating wind speeds. The more severe the operating conditions, the higher the wind speed, thus achieving a precise match between risk level and heat exchange enhancement intensity. The two-level judgment adopts the logic of prioritizing the judgment of high-risk conditions, ensuring that the most severe operating conditions receive the highest level of heat exchange protection first, avoiding the omission of high-risk scenarios. Furthermore, the graded control avoids unnecessary high-wind-speed operation under non-extreme operating conditions, reduces the magnitude of wind speed increase, and reduces the sensory impact of sudden airflow changes on users. While ensuring the anti-shutdown effect, it also takes into account the user's comfort.

[0013] In some embodiments of this application, a portable air conditioner is provided, wherein the controller is further configured to perform the following steps: When it is determined that the first preset condition is met simultaneously, it is determined whether the set windshield is the first windshield; If the set wind speed is the first wind speed, then control the fan motor to run at the set wind speed; If the set wind speed is not the first wind speed, then control the fan motor to force it to run at the first wind speed.

[0014] The above technical solution has the following advantages or beneficial effects: Under the highest risk conditions, the system will only force the system to upgrade to the first wind speed if the user's set wind speed is not the first wind speed (high wind speed); if the user has already set the first wind speed, the system will operate directly according to the user's setting. This logic accurately covers the core scenario of "risk caused by user mistakenly selecting low / medium wind speed", without interfering with users who originally selected the first wind speed. This ensures that the wind speed meets the heat exchange safety requirements in all scenarios, while fully respecting the user's first wind speed selection, avoiding unnecessary forced operation, and improving the user experience.

[0015] In some embodiments of this application, a portable air conditioner is provided, wherein the controller is further configured to perform the following steps: When it is determined that the second preset condition is met simultaneously, it is determined whether the set wind speed is the second wind speed, wherein the second wind speed is lower than the first wind speed; If the set wind speed is the second wind speed, then the fan motor is controlled to force the third wind speed to run, wherein the third wind speed is higher than the second wind speed and lower than the first wind speed; If the set wind speed is not the second wind speed, then control the fan motor to run at the set wind speed.

[0016] The above technical solution has the following advantages or beneficial effects: Under the second highest risk conditions, only the second fan speed (lowest fan speed) is forcibly increased to the third fan speed (middle fan speed), and no intervention is made for the user settings of medium and high fan speeds; Under the second worst conditions, the heat exchange capacity of the medium fan speed is sufficient to control the current of the whole machine within the safe threshold, and there is no need to forcibly increase it to the high fan speed; Only the low fan speed is slightly increased, the change in wind speed is small, the user's perception is weak, and while effectively avoiding shutdown, the impact on the user experience is minimized.

[0017] In some embodiments of this application, a portable air conditioner is provided, wherein the first preset condition includes the indoor ambient temperature reaching or exceeding a first temperature threshold and the overall input voltage being below a first voltage threshold; The second preset condition includes the indoor ambient temperature reaching or exceeding a second temperature threshold, and the overall input voltage being below a second voltage threshold, wherein the first temperature threshold is greater than the second temperature threshold, and the first voltage threshold is less than the second voltage threshold.

[0018] In some embodiments of this application, a portable air conditioner is provided, wherein the first voltage threshold is determined based on the rated voltage of the portable air conditioner and a first proportional value; The second voltage threshold is determined based on the rated voltage of the portable air conditioner and a second proportional value, wherein the first proportional value is less than the second proportional value.

[0019] In some embodiments of this application, a portable air conditioner is provided, wherein the controller is further configured to perform the following steps: If it is determined that the indoor ambient temperature and the unit input voltage do not simultaneously meet the preset triggering conditions, the fan motor is controlled to run at the set fan speed.

[0020] The above technical solution has the following advantages or beneficial effects: when the indoor ambient temperature and the input voltage of the whole machine do not meet the trigger conditions at the same time, it will operate completely according to the fan speed set by the user. The controller will not perform any forced intervention and will only intervene in protection under high-risk conditions, so as to achieve the effect of full autonomy under normal working conditions and strong protection under harsh working conditions, thereby maximizing the user experience.

[0021] In some embodiments of this application, a portable air conditioner is provided, further comprising: The display screen shows the set fan speed. The controller is also electrically connected to the display screen, and the controller is further configured to perform the following steps: If the preset triggering conditions are met simultaneously, the fan motor is controlled to run at the corresponding preset wind speed, and the display screen is controlled to keep displaying the set wind speed.

[0022] The above technical solution has the following advantages or beneficial effects: This design avoids the user's illusion that the equipment is not responding to instructions and automatically switching gears. It completes overcurrent protection without the user's awareness, which not only solves the tripping problem technically, but also eliminates user confusion and dissatisfaction from the perspective of user experience, effectively reducing the user complaint rate.

[0023] In some embodiments of this application, a portable air conditioner is provided, wherein the controller is further configured to perform the following steps: When the fan motor is controlled to run at the preset forced wind speed, if a wind speed adjustment command is received, the display screen is controlled to update and display the adjusted set wind speed, and the fan motor is kept running at the preset forced wind speed.

[0024] The above technical solution has the following advantages or beneficial effects: the logic takes into account both interactive experience and operational safety: it ensures that the user's operation has positive visual feedback and will not cause misunderstanding of button failure, while always maintaining sufficient heat exchange capacity to avoid the risk of tripping again when the user adjusts to a lower fan speed.

[0025] In some embodiments of this application, a portable air conditioner is provided, wherein the controller is further configured to perform the following steps: When it is detected that the indoor ambient temperature and the unit input voltage no longer simultaneously meet the preset triggering conditions, the fan motor is controlled to resume operation at the set fan speed after a preset time.

[0026] The above technical solution has the following advantages or beneficial effects: When the triggering condition disappears, the controller does not immediately restore the user-set fan speed, but restores it after a preset time delay. This can filter out short-term changes in operating conditions such as instantaneous fluctuations in ambient temperature and instantaneous drops in voltage, avoid forced frequent changes in fan speed, and ensure the stability of the portable air conditioner's operating status through the delayed recovery mechanism. This not only improves the user's sensory experience, but also helps to extend the service life of the equipment.

[0027] The effects of the above-mentioned technical solutions are not limited to those mentioned above. Those skilled in the art can clearly understand other effects not mentioned from the description in the claims. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1This is a schematic diagram of the structure of a portable air conditioner provided in one embodiment of this application.

[0029] Figure 2 This is a schematic diagram of the structure of a portable air conditioner provided in another embodiment of this application.

[0030] Figure 3 This is a schematic diagram illustrating the steps that a controller can execute according to an embodiment of this application.

[0031] Figure 4 This is a schematic diagram illustrating the steps that the controller can execute according to another embodiment of this application.

[0032] Figure 5 This is a schematic diagram illustrating the steps that the controller can execute according to another embodiment of this application.

[0033] Figure 6 This is a schematic diagram illustrating the steps that the controller can execute according to another embodiment of this application.

[0034] Figure 7 This is a schematic diagram illustrating the steps that the controller can execute according to another embodiment of this application.

[0035] Explanation of reference numerals in the attached diagram: 1. Compressor; 2. Outdoor heat exchanger; 3. Indoor heat exchanger; 4. Indoor fan blade; 5. Outdoor fan blade; 6. Fan motor. Detailed Implementation

[0036] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0037] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily need to be executed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the actual situation. It should also be noted that "multiple" as mentioned in this application refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0038] The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a particular order. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0039] When a structural element is mentioned as being "connected" or "in contact" with another structural element, it may mean that it is directly connected to or in contact with the other structural element, but it can also be understood as meaning that there are other structural elements between them. Conversely, when a structural element is mentioned as being "directly connected" or "directly in contact" with another structural element, it should be understood as meaning that there are no other structural elements between them.

[0040] Unless the context clearly indicates a different meaning, the singular form includes the plural form.

[0041] Portable air conditioners are air conditioners that can be moved around freely. As the application scenarios for portable air conditioners continue to expand, their operational stability under harsh working conditions and the optimization of user experience have become important research and development directions in the industry.

[0042] Currently, single-fan motor portable air conditioners, because the indoor and outdoor fans share the same motor and their speeds are forced to be synchronized, are prone to problems such as a sudden drop in the overall heat exchange efficiency and a surge in current when users mistakenly select the low-speed cooling mode under high temperature and low voltage conditions, which inevitably affects the user's normal user experience.

[0043] Therefore, how to avoid the problem of the whole machine stopping due to low fan speed operation under harsh conditions without changing the inherent structure of the single fan motor, and ensure the stability of cooling operation and user experience, is a technical problem that urgently needs to be solved in this field.

[0044] Figure 1 This is a schematic diagram of the structure of a portable air conditioner provided in one embodiment of this application. Figure 2 This is a schematic diagram of the structure of a portable air conditioner provided in another embodiment of this application.

[0045] See Figure 1 and Figure 2 As shown below, each part of the portable air conditioner will be described in detail.

[0046] In some embodiments of this application, the portable air conditioner is an integrated refrigeration device that can be placed indoors without separate installation. It only exhausts waste heat from the outdoor side to the outside of the building through an exhaust duct. Its core working logic is as follows: it transfers indoor heat through the phase change of the refrigerant in the refrigerant circulation loop, and then achieves indoor air temperature regulation and outdoor heat dissipation through two independent air ducts. The indoor fan blades 4 and the outdoor fan blades 5 are synchronously driven by the same fan motor 6, and the rotation speed on both sides is always consistent, making it impossible to adjust the wind speed on one side individually.

[0047] During cooling operation, the indoor side air duct continuously draws in hot indoor air, which is cooled by the indoor heat exchanger 3 and then returned to the room, thus achieving room cooling. The outdoor side air duct draws in air, which flows through the outdoor heat exchanger 2, carrying the condensation heat released by the refrigerant, and is then forced out to the outside through the exhaust pipe, completing the heat transfer to the outside. The entire unit can simultaneously change the heat exchange air volume on both the indoor and outdoor sides by adjusting the speed of the fan motor 6, thereby changing the heat exchange efficiency and operating load of the entire cooling system.

[0048] It should be noted that the indoor air duct and the outdoor air duct are two completely independent and sealed chambers, and the hot and cold air do not mix, which avoids the cancellation of indoor cooling and outdoor heat, and ensures cooling efficiency and operational stability.

[0049] In some embodiments of this application, the portable air conditioner may include a refrigerant circulation loop, which is the core system for the portable air conditioner to achieve cooling. The refrigerant circulation loop consists of a compressor 1, an outdoor heat exchanger 2, a throttling element, and an indoor heat exchanger 3 connected in sequence and sealed through refrigerant pipelines to form a closed circulation loop. The loop is filled with refrigerant as a heat transfer medium, so that the refrigerant circulates in the loop formed by the sequential connection of the compressor 1, the outdoor heat exchanger 2, the throttling element, and the indoor heat exchanger 3.

[0050] In some embodiments of this application, compressor 1 serves as the power core of the refrigerant cycle. Its function is to draw in low-temperature, low-pressure gaseous refrigerant returning from indoor heat exchanger 3, compress the refrigerant to convert it into high-temperature, high-pressure gaseous refrigerant, and then discharge it to outdoor heat exchanger 2. The operating power of compressor 1 determines the cooling capacity of the portable air conditioner.

[0051] In some embodiments of this application, the outdoor heat exchanger 2 can adopt a finned tube structure and be arranged in the outdoor side air duct. Its function is to receive the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 1, and transfer the heat of the refrigerant to the flowing air through the heat exchange tube wall and fins; after releasing heat, the refrigerant condenses into a medium-temperature, high-pressure liquid refrigerant, which flows to the throttling element. In cooling mode, the outdoor heat exchanger 2 undertakes the function of dissipating heat to the outside, and its heat exchange efficiency directly affects the condensing pressure and the operating load of the compressor 1.

[0052] In some embodiments of this application, in cooling mode, the outdoor heat exchanger 2 can be a condenser.

[0053] In some embodiments of this application, the throttling element can be a capillary tube or an electronic expansion valve, connected in series in the refrigerant pipeline between the outdoor heat exchanger 2 and the indoor heat exchanger 3. Its function is to throttle and reduce the pressure of the medium-temperature, high-pressure liquid refrigerant: after flowing through the narrow throttling channel, the pressure and temperature of the liquid refrigerant drop sharply, transforming it into a low-temperature, low-pressure gas-liquid two-phase mixture, which is then sent to the indoor heat exchanger 3. The throttling element is the core component in the refrigeration system for achieving refrigerant cooling, directly determining the cooling temperature of the indoor heat exchanger 3.

[0054] In some embodiments of this application, the indoor heat exchanger 3 can adopt a finned tube structure, and is not located in the indoor side air duct. Its function is to receive the low-temperature, low-pressure gas-liquid two-phase refrigerant after throttling. The refrigerant evaporates and absorbs heat in the heat exchange tube, absorbing heat from the air flowing through it through the tube wall and fins. After absorbing heat, the refrigerant completely vaporizes into a low-temperature, low-pressure gaseous state and flows back to the compressor 1, completing one cycle. In cooling mode, the indoor heat exchanger 3 undertakes the function of indoor cooling, and the air flowing over its surface is cooled and sent into the room as cold air.

[0055] In some embodiments of this application, in cooling mode, the indoor heat exchanger 3 can be an evaporator.

[0056] In some embodiments of this application, the portable air conditioner may include an indoor fan blade 4. The indoor fan blade 4 is disposed on the corresponding side of the indoor heat exchanger 3 and is used to drive indoor air to flow through the indoor heat exchanger 3, ensuring that indoor air flows continuously and stably through the surface of the indoor heat exchanger 3, thereby enhancing the convective heat transfer efficiency on the indoor side; the higher the rotation speed of the indoor fan blade 4, the greater the amount of air flowing through the indoor heat exchanger 3 per unit time, and the stronger the heat transfer effect on the indoor side.

[0057] In some embodiments of this application, the portable air conditioner may include an outdoor fan blade 5. The outdoor fan blade 5 is located on the corresponding side of the outdoor heat exchanger 2 and is used to drive outdoor air to flow through the outdoor heat exchanger 2, so as to remove the condensing heat released by the outdoor heat exchanger 2 in a timely manner and avoid the continuous rise of condensing temperature and pressure; the higher the rotation speed of the outdoor fan blade 5, the stronger the heat exchange capacity on the outdoor side, the lower the condensing pressure, and the smaller the operating load of the compressor 1.

[0058] In some embodiments of this application, the portable air conditioner may include a fan motor 6. The fan motor 6 is connected to the indoor fan blade 4 and the outdoor fan blade 5 respectively, and is used to synchronously drive the indoor fan blade 4 and the outdoor fan blade 5 to rotate.

[0059] In some embodiments of this application, the fan motor 6 can be an internal and external coaxial motor.

[0060] In some embodiments of this application, the portable air conditioner may include an ambient temperature sensor. The ambient temperature sensor is used to detect the indoor ambient temperature. The ambient temperature sensor may be located at the indoor return air vent.

[0061] In some embodiments of this application, the portable air conditioner may include a voltage detection module. The voltage detection module is used to detect the input voltage of the entire unit.

[0062] In some embodiments of this application, the portable air conditioner may include a display screen. The display screen is used to display the set fan speed.

[0063] In some embodiments of this application, the portable air conditioner may include a controller. The controller may be electrically connected to the fan motor 6, the ambient temperature sensor, and the voltage detection module. The controller may also be electrically connected to the fan motor 6, the ambient temperature sensor, the voltage detection module, and the display screen.

[0064] For portable air conditioners with a single fan motor, the indoor and outdoor fan speeds are forced to be synchronized. When the user selects a low fan speed, the heat exchange efficiency of the outdoor and indoor heat exchangers decreases simultaneously, leading to an increase in the condensing pressure of the refrigeration system and an increase in the compressor's operating load. If this is compounded by low voltage conditions, according to the power formula I=P / U, the combined effect of the increased overall power P and the decreased input voltage U will cause the operating current I to rise sharply, ultimately triggering overcurrent protection and causing the entire unit to trip.

[0065] Based on this, this application avoids risks before a failure occurs by proactively identifying high-risk operating conditions and increasing fan speed to enhance heat exchange. Specifically: Figure 3 This is a schematic diagram illustrating the steps that a controller can execute according to an embodiment of this application. See also... Figure 3 As shown, in some embodiments of this application, the controller can be configured to perform the following S110-S130: S110, in cooling mode, acquires the indoor ambient temperature detected by the ambient temperature sensor and the overall input voltage detected by the voltage detection module.

[0066] S120 determines whether the indoor ambient temperature and the unit input voltage simultaneously meet the preset trigger conditions.

[0067] S130 If the preset trigger conditions are met simultaneously, the fan motor is controlled to run at the corresponding preset fan speed.

[0068] S110-S130 will be described in detail below.

[0069] In S110, in some embodiments of this application, when the portable air conditioner receives the cooling mode start command and the compressor and fan motor start running normally, the controller can start a periodic sampling mechanism, for example, to complete a complete parameter acquisition and data filtering process every 10 seconds, to ensure the real-time performance and stability of the detection data and avoid misjudgment caused by instantaneous operating condition fluctuations.

[0070] The indoor ambient temperature detected by the ambient temperature sensor can accurately reflect the actual cooling load in the room. The higher the indoor ambient temperature, the greater the room's heat load, the stronger the cooling capacity required by the compressor, and the higher the overall unit's basic operating power.

[0071] The voltage detection module measures the overall input voltage of the unit, which directly reflects the current power grid's supply capacity. The lower the overall input voltage, the higher the operating current of the unit at the same operating power, and the higher the risk of overcurrent tripping.

[0072] In S120, the trigger condition is only considered met when both the indoor ambient temperature and the overall input voltage reach the threshold. If either condition is not met, the system is not triggered.

[0073] This logic can accurately identify the combined severe operating conditions of "high temperature and high load + low voltage", effectively eliminating false triggering caused by fluctuations in a single parameter. For example, when there is only high temperature but the voltage is normal, the overall current is still within the safe range, and there is no need to forcibly adjust the fan speed; when there is only low voltage but the ambient temperature is low, the cooling load is small, and there will be no overcurrent tripping.

[0074] In S130, in some embodiments of this application, the preset fan speed can correspond one-to-one with the risk level of the operating condition. When the first-level high-risk condition is met, the corresponding preset fan speed can be high; when the second-level medium-risk condition is met, the corresponding preset fan speed can be medium. The higher the risk level, the higher the fan speed and the stronger the heat exchange enhancement, in order to match the heat dissipation requirements of the system.

[0075] Because the indoor and outdoor fan blades are coaxially connected to the fan motor, when the fan motor speeds up, the indoor and outdoor fan blades simultaneously increase their speeds. Increased outdoor airflow significantly improves the condenser's heat exchange efficiency, reduces condensing temperature and pressure, and consequently reduces the compressor's exhaust resistance and operating load, causing a decrease in the overall unit power (P). According to the current calculation formula I=P / U, assuming the input voltage U remains constant, the decrease in overall unit power (P) directly leads to a drop in operating current (I), bringing the current value below the overcurrent protection threshold and preventing the unit from tripping. Simultaneously, the synchronous increase in indoor airflow also enhances the evaporator's heat exchange effect, ensuring cooling output capacity and preventing a decrease in cooling performance due to protection controls.

[0076] As shown in S110-S130 above, for a portable air conditioner with a single fan motor, in cooling mode, two parameters are simultaneously collected: indoor ambient temperature and unit input voltage. The system uses the simultaneous fulfillment of preset conditions as the trigger logic, accurately identifying adverse operating conditions of high temperature and high load combined with low voltage. This avoids false intervention caused by triggering a single parameter, ensuring the accuracy of protection actions. When the trigger conditions are met, the system actively controls the fan motor to operate at the corresponding preset fan speed. By increasing the fan speed, the heat exchange efficiency between the indoor and outdoor heat exchangers is simultaneously enhanced, reducing the condensing pressure of the cooling system and the compressor's operating load. This suppresses the surge in unit power and current, fundamentally preventing overcurrent protection tripping and ensuring the continuity and stability of cooling operation.

[0077] Figure 4 This is a schematic diagram illustrating the steps that a controller can execute according to another embodiment of this application. See also... Figure 4 As shown, in some embodiments of this application, the preset triggering conditions include a first preset condition and a second preset condition; the controller can be configured to execute the following S210-S240: S210, determine whether the indoor ambient temperature and the whole machine input voltage simultaneously meet the first preset condition; S220, if the first preset condition is met simultaneously, the fan motor is controlled to run at the first speed setting.

[0078] S230, if the first preset condition is not met, then determine whether the indoor ambient temperature and the whole machine input voltage simultaneously meet the second preset condition.

[0079] S240, if the second preset condition is met at the same time, control the fan motor to run at a speed not higher than the first wind speed.

[0080] S210-S240 will be described in detail below.

[0081] In S210, in some embodiments of this application, the first preset condition corresponds to the highest risk level of the whole machine operation, namely the extreme and severe condition of high cooling and low voltage. Under this condition, the probability of tripping when running at low fan speed is the highest. Therefore, it is set as the highest judgment priority to ensure that extreme risks are identified first and protected first, and to avoid missing high-risk scenarios due to judging low-level conditions first.

[0082] In some embodiments of this application, the first preset condition may include an indoor ambient temperature that is above a first temperature threshold and a total input voltage that is below a first voltage threshold.

[0083] In some embodiments of this application, the first temperature threshold may be set to 33 degrees Celsius. The first temperature threshold may also be set to other values.

[0084] In some embodiments of this application, the first voltage threshold can be determined based on the rated voltage of the portable air conditioner and a first proportional value. Specifically, the first voltage threshold can be equal to the product of the rated voltage of the portable air conditioner and the first proportional value. The first proportional value can be set to 90%. The first proportional value can also be set to other values.

[0085] In S220, in some embodiments of this application, when the indoor ambient temperature reaches or exceeds a first temperature threshold and the overall machine input voltage is below a first voltage threshold, it can be determined that the indoor ambient temperature and the overall machine input voltage simultaneously meet the first preset condition.

[0086] In some embodiments of this application, if the indoor ambient temperature reaches 33 degrees Celsius or above and the input voltage of the whole unit is below 90% of the rated voltage of the portable air conditioner, it can be determined that the first preset condition is met simultaneously.

[0087] In S230, in some embodiments of this application, when the indoor ambient temperature is below a first temperature threshold or the whole machine input voltage reaches above a first voltage threshold, it can be determined that the indoor ambient temperature and the whole machine input voltage do not meet the first preset conditions.

[0088] In some embodiments of this application, if the indoor ambient temperature is below 34 degrees Celsius, or the total input voltage of the unit reaches more than 90% of the rated voltage of the portable air conditioner, it can be determined that the indoor ambient temperature and the total input voltage do not meet the first preset condition.

[0089] In some embodiments of this application, the second preset condition may include an indoor ambient temperature exceeding a second temperature threshold and a system input voltage below a second voltage threshold. Wherein, the first temperature threshold is greater than the second temperature threshold, and the first voltage threshold is less than the second voltage threshold.

[0090] In some embodiments of this application, the second temperature threshold may be set to 34 degrees Celsius. The first temperature threshold may also be set to other values.

[0091] In some embodiments of this application, the second voltage threshold can be determined based on the rated voltage of the portable air conditioner and a second proportional value. The first proportional value can be less than the second proportional value. Specifically, the second voltage threshold can be equal to the product of the rated voltage of the portable air conditioner and the second proportional value. The second proportional value can be set to 95%. The second proportional value can also be set to other values.

[0092] In S240, in some embodiments of this application, when the indoor ambient temperature reaches or exceeds the second temperature threshold and the overall machine input voltage is below the second voltage threshold, it can be determined that the indoor ambient temperature and the overall machine input voltage simultaneously meet the second preset condition.

[0093] In some embodiments of this application, if the indoor ambient temperature reaches 33 degrees Celsius or above and the input voltage of the whole unit is below 95% of the rated voltage of the portable air conditioner, it can be determined that the second preset condition is met simultaneously.

[0094] Since the second preset condition is a less severe operating condition and the first preset condition is a more severe operating condition, if the second preset condition is met at the same time, the fan motor is controlled to run at a speed no higher than the first wind speed. This adapts to the operating logic that the higher the wind speed corresponds to the more severe the operating condition, avoiding unnecessary high wind speed operation under non-extreme operating conditions, reducing the magnitude of wind speed increase, and reducing the sensory impact of sudden air volume changes on users. While ensuring the anti-shutdown effect, it also takes into account the user's comfort.

[0095] As shown in S210-S240 above, the triggering conditions are divided into the first preset condition (more severe operating conditions) and the second preset condition (secondary severe operating conditions), which correspond to different levels of operating wind speed. The more severe the operating condition, the higher the wind speed, thus achieving a precise match between the risk level and the heat exchange enhancement intensity. The two-level judgment adopts the logic of prioritizing the judgment of high-risk conditions to ensure that the most severe operating conditions receive the highest level of heat exchange protection first, avoiding the omission of high-risk scenarios. In addition, the graded control avoids unnecessary high-wind speed operation under non-extreme operating conditions, reduces the magnitude of wind speed increase, and reduces the sensory impact of sudden air volume changes on users. While ensuring the anti-shutdown effect, it also takes into account the user's comfort.

[0096] Figure 5 This is a schematic diagram illustrating the steps that a controller can execute according to another embodiment of this application. See also... Figure 5 As shown, in some embodiments of this application, the controller can be configured to perform the following S310-S330: S310, when it is determined that the first preset condition is met at the same time, determine whether the set windshield is the first windshield.

[0097] S320: If the set wind speed is the first wind speed, the fan motor will be controlled to run at the set wind speed.

[0098] S330: If the set fan speed is not the first fan speed, the fan motor will be forced to run at the first fan speed.

[0099] S310-S330 will be described in detail below.

[0100] In S310, in some embodiments of this application, the first wind deflector can be the wind deflector with the highest wind speed, i.e., the highest wind deflector, which corresponds to the strongest heat exchange capacity.

[0101] In some embodiments of this application, the set wind speed can be input by the user via remote control, control panel, or mobile app. Under normal operating conditions without triggering forced control, the fan motor always operates at the set wind speed.

[0102] In the S320, when the user has actively selected the first fan speed, both the indoor and outdoor fan blades operate at their highest speeds. The outdoor condenser's heat exchange capacity is at its peak, efficiently removing the condensing heat released by the refrigerant and maintaining the condensing pressure and compressor load within a reasonable range. The overall operating current is naturally below the overcurrent protection threshold, eliminating the risk of shutdown. No additional intervention is required at this time; simply maintaining the user settings will simultaneously meet both cooling needs and safe operation requirements.

[0103] In S330, in some embodiments of this application, under extreme operating conditions of the first preset condition, the outdoor heat exchange air volume corresponding to the low and medium fan speeds is insufficient to meet the system's condensation and heat dissipation requirements. This leads to a continuous increase in condensation pressure, a sharp increase in compressor exhaust resistance, and a rapid increase in overall operating power and current, ultimately triggering overcurrent protection tripping. At this time, when the fan speed actively selected by the user is not the first fan speed, by forcibly increasing it to the first fan speed, the heat exchange air volume on both the indoor and outdoor sides can be increased simultaneously, quickly enhancing the condenser's heat dissipation effect, reducing the system's operating load and overall current, and eliminating the risk of tripping from the root cause.

[0104] As shown in S310-S330 above, under the highest risk conditions, the fan speed will only be forcibly increased to the first fan speed if the user's set fan speed is not the first fan speed (high fan speed). If the user has already set the first fan speed, the operation will be directly based on the user's setting. This logic accurately covers the core scenario of "risk caused by user mistakenly selecting low / medium fan speed". It does not interfere with users who originally selected the first fan speed. It ensures that the fan speed meets the heat exchange safety requirements in all scenarios, while fully respecting the user's first fan speed selection, avoiding unnecessary forced operation, and improving the user experience.

[0105] Figure 6 This is a schematic diagram illustrating the steps that a controller can execute according to another embodiment of this application. See also... Figure 6 As shown, in some embodiments of this application, the controller can be configured to perform the following S410-S430: S410, when it is determined that the second preset condition is met at the same time, it is determined whether the set wind speed is the second wind speed, wherein the second wind speed is lower than the first wind speed.

[0106] S420 If the set wind speed is the second wind speed, the fan motor is controlled to force the third wind speed to run. The third wind speed is higher than the second wind speed and lower than the first wind speed.

[0107] S430: If the set wind speed is not the second wind speed, the fan motor will be controlled to run at the set wind speed.

[0108] S410-S430 will be described in detail below.

[0109] In S410, in some embodiments of this application, the second wind deflector can be the wind deflector with the lowest wind speed, i.e., the lowest wind deflector, corresponding to the weakest heat exchange capacity.

[0110] In S420, in some embodiments of this application, the third fan speed can be a moderate fan speed, i.e., a medium fan speed, corresponding to a moderate heat exchange capacity. This step adopts a gradient control strategy of increasing only one speed level, rather than directly jumping to the first fan speed level. Under medium-risk operating conditions, the outdoor heat exchange air volume corresponding to the third fan speed level (medium fan speed) is sufficient to control the condensing pressure and compressor load within a reasonable range, causing the overall current to drop below the safe threshold, completely eliminating the risk of shutdown. Compared to directly increasing to a high fan speed level, the change in fan speed by only one speed level is smaller, and the fluctuations in indoor air supply noise and perceived air volume are much weaker, making it almost imperceptible to the user. This ensures operational safety while maximizing user comfort.

[0111] In S430, in some embodiments of this application, under the medium-risk operating condition of the second preset condition, the outdoor heat exchange capacity corresponding to the medium fan speed and above is sufficient to meet the system's condensation and heat dissipation requirements. The overall operating current is naturally below the overcurrent protection threshold, and there is no risk of tripping. At this time, the user's fan speed selection is fully respected without any intervention. This not only does not affect operational safety but also fully protects the user's autonomy and avoids confusion for the user regarding changing the fan speed on their own.

[0112] As shown in S410-S430 above, under the second highest risk conditions, only the second fan speed (lowest fan speed) is forcibly increased to the third fan speed (middle fan speed). No intervention is made for user settings of medium and high fan speeds. Under the second worst conditions, the heat exchange capacity of the medium fan speed is sufficient to control the current of the whole machine within the safe threshold, so there is no need to forcibly increase it to the high fan speed. Only the low fan speed is slightly increased, the change in wind speed is small and the user's perception is weak. While effectively avoiding shutdown, the impact on the user experience is minimized.

[0113] In other embodiments of this application, the controller is also configured to perform the following steps: S510: If it is determined that the indoor ambient temperature and the whole machine input voltage do not simultaneously meet the preset trigger conditions, the fan motor is controlled to run at the set fan speed.

[0114] In S510, the following three scenarios are included when the indoor ambient temperature and the unit's input voltage do not meet the requirements simultaneously: First, the indoor ambient temperature does not reach the threshold, and the cooling load is small, which is insufficient to cause the current to exceed the limit; Second, the unit's input voltage is higher than the threshold, the power supply capacity is sufficient, and the operating current will not reach the protection value under the same power; Third, neither the temperature nor the voltage reaches the risk threshold.

[0115] In the three scenarios described above, there are no objective conditions that would cause the system to trip due to overcurrent when operating at a low fan speed. Therefore, there is no need for forced airflow intervention, and the fan motor can be controlled to operate at the set fan speed.

[0116] Therefore, when the indoor ambient temperature and the unit's input voltage do not simultaneously meet the triggering conditions, the unit will operate entirely according to the fan speed set by the user, without any forced intervention from the controller. It will only intervene to protect the unit under high-risk conditions, achieving the effect of full autonomy under normal operating conditions and strong protection under harsh operating conditions, thus maximizing the user experience.

[0117] In other embodiments of this application, the controller is also electrically connected to the display screen, and the controller is further configured to perform the following steps: S610, if the preset trigger conditions are met simultaneously, controls the fan motor to run at the corresponding preset fan speed and controls the display screen to keep displaying the set fan speed.

[0118] In S610, the issue of forced fan speed adjustment causing discrepancies between the displayed fan speed and the user's setting, leading to the user's misperception of equipment malfunction and automatic speed changes, resulting in confusion and complaints, is addressed in this embodiment by proposing a control strategy that decouples the actual operating fan speed from the displayed fan speed. The actual operating link prioritizes operational safety, dynamically adjusting the fan motor speed based on operating conditions to ensure continuous operation without shutdown. The display output link prioritizes user-defined consistency, always using the user-defined fan speed as the display basis, unaffected by forced control from the backend.

[0119] Under harsh operating conditions of high temperature and low voltage, the controller forcibly increases the fan motor speed to ensure operational safety, and the display screen always displays the user's original fan speed setting. This achieves safety protection without the user's awareness, providing dual protection for operational safety and user experience.

[0120] Therefore, this design avoids giving users the illusion that the device is not responding to commands or automatically switching gears. It completes overcurrent protection without the user's awareness, which not only solves the tripping problem technically, but also eliminates user confusion and dissatisfaction from the perspective of user experience, effectively reducing the user complaint rate.

[0121] In other embodiments of this application, the controller is also configured to perform the following steps: S710: When the fan motor is controlled to run at the preset forced air level, if an air level adjustment command is received, the control display screen will update to show the adjusted set air level, and the fan motor will continue to run at the preset forced air level.

[0122] In S710, it should be noted that this step only takes effect when "the preset trigger condition is still met and the fan motor is in forced wind speed operation state"; if the operating condition no longer meets the trigger condition and the forced control has been released, the wind speed adjustment command will change both the display and the actual operation, returning to the normal control logic.

[0123] Therefore, this logic balances user experience and operational safety: it ensures that users' operations receive positive visual feedback and avoids the misunderstanding that buttons are malfunctioning, while maintaining sufficient heat exchange capacity to prevent the risk of shutdown when users adjust to a lower fan speed.

[0124] In other embodiments of this application, the controller is also configured to perform the following steps: S810, when it detects that the indoor ambient temperature and the whole machine input voltage no longer simultaneously meet the preset trigger conditions, controls the fan motor to resume the set fan speed operation after a preset time.

[0125] In S810, in some embodiments of this application, a software timing unit is integrated within the controller. The preset duration can be set to 2-3 minutes. The preset duration can also be set to other values.

[0126] When restoring the fan speed, the controller gradually adjusts the fan motor speed to the set fan speed instead of jumping instantaneously, further reducing the sudden change in airflow and noise. At the same time, since the display screen always shows the set fan speed, the display status does not need to be changed during the restoration process. The actual operation and display are restored from a decoupled state to consistency, and there is no visual change for the user.

[0127] Therefore, when the triggering condition disappears, the controller does not immediately restore the user-set fan speed, but delays for a preset time before restoring it. This can filter out short-term changes in operating conditions such as instantaneous fluctuations in ambient temperature and instantaneous drops in voltage, avoiding forced frequent changes in fan speed. The delayed recovery mechanism ensures the stability of the portable air conditioner's operation, which not only improves the user's sensory experience but also helps extend the equipment's service life.

[0128] Please see Figure 7 , Figure 7 This is a schematic diagram illustrating the steps that a controller can execute according to another embodiment of this application. See also... Figure 7 As shown, the specific steps and process sequence are as follows: Users can start the portable air conditioner and select the cooling mode via remote control, control panel, or mobile app. The compressor and fan motor will then start running according to the user's initial settings. At the same time, the controller will enter the loop detection process of this control logic to continuously monitor the operating conditions.

[0129] The controller can acquire the current indoor ambient temperature T through an ambient temperature sensor and the current unit input voltage V1 through a voltage detection module on the control board. The rated voltage V2 of the portable air conditioner is a fixed parameter pre-stored in the controller's storage unit and can be 220V. This step can employ a periodic sampling method, for example, completing a full data acquisition and filtering process every 10 seconds to ensure stable and accurate detection parameters, providing a reliable basis for subsequent operating condition judgments.

[0130] The controller compares the collected parameters T and V1 with the first preset condition to determine whether "the indoor ambient temperature T ≥ 34℃ and the total input voltage V1 ≤ 90% of the rated voltage V2" are simultaneously met. This step corresponds to extremely severe high-risk operating conditions and is set as the highest priority to ensure that the most dangerous operating conditions are identified and protected first. A two-parameter "AND logic" judgment is used, and the high-risk operating condition is only determined when both temperature and voltage reach the threshold.

[0131] If both of the above conditions are met simultaneously, the current condition is determined to be high-risk and severe. Subsequently, the controller reads the user-set fan speed W recorded in the storage unit and determines whether the user-set fan speed is high. If the user-set fan speed is high: the fan motor is controlled to run directly at the user-set high fan speed. At this time, the user-selected high fan speed already has sufficient heat exchange capacity, ensuring that the system operating current is within a safe threshold, requiring no additional forced intervention and fully respecting user operation. If the user-set fan speed is not high (i.e., set to low or medium fan speed): the controller executes a forced control program, controlling the fan motor to run at high fan speed. By increasing the fan speed, the heat exchange efficiency of the indoor and outdoor heat exchangers is simultaneously enhanced, quickly reducing the condensing pressure and compressor operating load, causing the overall operating current to drop back to a safe range, and completely avoiding overcurrent tripping.

[0132] If either the indoor ambient temperature T or the unit input voltage V1 fails to reach the threshold of the first preset condition, it is determined that the current high-risk operating condition is not met, and the process enters the second-level medium-risk operating condition determination stage.

[0133] The controller compares the collected parameters with the second preset condition to determine whether the conditions "indoor ambient temperature T≥33℃ and total input voltage V1≤95% of rated voltage V2" are simultaneously met. This step corresponds to a moderately severe, medium-risk operating condition. The second temperature threshold of 33℃ is lower than the first temperature threshold of 34℃, and the second voltage threshold (95% of rated voltage) is higher than the first voltage threshold (90% of rated voltage). The trigger boundary is more lenient, which is used to cover operating conditions with a slightly lower risk level.

[0134] If both of the above conditions are met simultaneously, the current operating condition is determined to be medium-risk. Subsequently, the controller reads the user-set fan speed W and determines whether the user-set fan speed is low. If the user-set fan speed is low: the controller executes a forced control program, controlling the fan motor to run at medium speed. Under medium-risk conditions, only the low fan speed poses a risk of insufficient heat exchange and current approaching the protection threshold. Simply increasing the fan speed by one level to medium speed eliminates the risk of tripping; a slight increase in airflow reduces changes in user experience, balancing operational safety and user comfort. If the user-set fan speed is not low (i.e., set to medium or high speed): the fan motor is controlled to run at the user-set fan speed. Under medium-risk conditions, the heat exchange capacity of medium speed and higher speeds already meets the safety requirements, requiring no forced intervention and fully complying with the user's airflow needs.

[0135] If either the indoor ambient temperature T or the unit input voltage V1 does not reach the threshold of the second preset condition, it is determined that no level of risk condition has been reached and there is no risk of tripping due to low fan speed operation. The controller controls the fan motor to run completely according to the fan speed W set by the user and does not perform any forced adjustments, thus fully ensuring the normal user experience.

[0136] The preferred embodiments of the present invention have been illustrated and described above. However, the present invention is not limited to the specific embodiments described above. Of course, those skilled in the art can make various modifications without departing from the spirit of the invention as claimed in the claims. These modifications should not be understood separately from the technical concept or prospect of the present invention.

[0137] This invention can be implemented in various forms, and its scope of claim is not limited to the embodiments described above. Therefore, any modified embodiment that includes the constituent elements within the scope of the claims of this invention should be considered to fall within the scope of the claims of this invention.

[0138] The embodiments of the present invention described above, or other embodiments thereof, are not mutually exclusive or distinct. The embodiments of the present invention described above, or other embodiments thereof, can be used in combination or in combination of their respective configurations or functions.

[0139] For example, it indicates that configuration A described in a particular embodiment and / or figure and configuration B described in another embodiment and / or figure can be combined. That is, even if no combination between the configurations is directly described, it indicates that they can be combined, except where cases where combination is impossible are explained.

[0140] The detailed description above should not be construed as limiting in all respects, but should be considered exemplary. The scope of the invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the invention are included within the scope of the invention.

Claims

1. A portable air conditioner, characterized in that, include: The refrigerant circulation loop allows the refrigerant to circulate in a loop consisting of the compressor, outdoor heat exchanger, throttling element, and indoor heat exchanger connected in sequence. An indoor fan blade is located on the corresponding side of the indoor heat exchanger and is used to drive indoor air to flow through the indoor heat exchanger. An outdoor fan blade is located on the corresponding side of the outdoor heat exchanger and is used to drive outdoor air to flow through the outdoor heat exchanger. A fan motor is connected to the indoor fan blade and the outdoor fan blade respectively, and is used to synchronously drive the indoor fan blade and the outdoor fan blade to rotate; An ambient temperature sensor is used to detect indoor ambient temperature. The voltage detection module is used to detect the input voltage of the entire machine. The controller is electrically connected to the fan motor, the ambient temperature sensor, and the voltage detection module. The controller is configured to perform the following steps: In cooling mode, the indoor ambient temperature detected by the ambient temperature sensor and the overall input voltage detected by the voltage detection module are obtained. Determine whether the indoor ambient temperature and the unit input voltage simultaneously meet the preset triggering conditions; If the preset triggering conditions are met simultaneously, the fan motor is controlled to operate at the corresponding preset fan speed.

2. The portable air conditioner according to claim 1, characterized in that, The preset triggering conditions include a first preset condition and a second preset condition; the controller is also configured to perform the following steps: Determine whether the indoor ambient temperature and the overall machine input voltage simultaneously meet the first preset condition; If the first preset condition is met simultaneously, the fan motor is controlled to operate at the first fan speed. If the first preset condition is not met, then determine whether the indoor ambient temperature and the whole machine input voltage simultaneously meet the second preset condition; If the second preset condition is met simultaneously, the fan motor is controlled to operate at a speed not higher than the first wind speed.

3. The portable air conditioner according to claim 2, characterized in that, The controller is also configured to perform the following steps: When it is determined that the first preset condition is met simultaneously, it is determined whether the set windshield is the first windshield; If the set wind speed is the first wind speed, then control the fan motor to run at the set wind speed; If the set wind speed is not the first wind speed, then control the fan motor to force it to run at the first wind speed.

4. The portable air conditioner according to claim 2, characterized in that, The controller is also configured to perform the following steps: When it is determined that the second preset condition is met simultaneously, it is determined whether the set wind speed is the second wind speed, wherein the second wind speed is lower than the first wind speed; If the set wind speed is the second wind speed, then the fan motor is controlled to force the third wind speed to run, wherein the third wind speed is higher than the second wind speed and lower than the first wind speed; If the set wind speed is not the second wind speed, then control the fan motor to run at the set wind speed.

5. The portable air conditioner according to claim 2, characterized in that, The first preset condition includes the indoor ambient temperature reaching or exceeding a first temperature threshold, and the overall input voltage being below a first voltage threshold. The second preset condition includes the indoor ambient temperature reaching or exceeding a second temperature threshold, and the overall input voltage being below a second voltage threshold, wherein the first temperature threshold is greater than the second temperature threshold, and the first voltage threshold is less than the second voltage threshold.

6. The portable air conditioner according to claim 5, characterized in that, The first voltage threshold is determined based on the rated voltage of the portable air conditioner and a first proportional value; The second voltage threshold is determined based on the rated voltage of the portable air conditioner and a second proportional value, wherein the first proportional value is less than the second proportional value.

7. The portable air conditioner according to claim 1, characterized in that, The controller is also configured to perform the following steps: If it is determined that the indoor ambient temperature and the unit input voltage do not simultaneously meet the preset triggering conditions, the fan motor is controlled to run at the set fan speed.

8. The portable air conditioner according to claim 1, characterized in that, Also includes: The display screen shows the set fan speed. The controller is also electrically connected to the display screen, and the controller is further configured to perform the following steps: If the preset triggering conditions are met simultaneously, the fan motor is controlled to run at the corresponding preset wind speed, and the display screen is controlled to keep displaying the set wind speed.

9. The portable air conditioner according to claim 7, characterized in that, The controller is also configured to perform the following steps: When the fan motor is controlled to run at the preset forced wind speed, if a wind speed adjustment command is received, the display screen is controlled to update and display the adjusted set wind speed, and the fan motor is kept running at the preset forced wind speed.

10. The portable air conditioner according to claim 1, characterized in that, The controller is also configured to perform the following steps: When it is detected that the indoor ambient temperature and the unit input voltage no longer simultaneously meet the preset triggering conditions, the fan motor is controlled to resume operation at the set fan speed after a preset time.

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