Defrosting method and system for mobile air conditioner

Abstract

The invention relates to the technical field of air conditioner operation mode control, in particular to a mobile air conditioner defrosting method and system.The heat exchange fluctuation condition of an evaporator is judged by obtaining dripping position information of condensate water on the surface of the evaporator dripping into a collecting tray within a preset position change influence time period; in response to the result of the heat exchange fluctuation condition of the evaporator, the condensation expression trend of the evaporator is judged based on the numerical rule analysis result of the trend representation sequence; and selecting a strategy for pre-defrosting the evaporator according to the condensation performance trend. The frosting trend caused by position changes is accurately captured, targeted intervention measures are taken in advance to avoid the frosting phenomenon that condensate water is splashed to the surface of the evaporator due to position movement of the mobile air conditioner, and the adjustment timeliness and the energy-saving performance of the mobile air conditioner for coping with environment sudden changes are improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning operation mode control technology, and in particular to a method and system for defrosting a portable air conditioner. Background Technology

[0002] Evaporator frosting is a critical issue directly affecting the heat exchange efficiency and operational stability of air conditioners. Frost buildup can clog the channels between the fins, leading to a drop in evaporation temperature and a decrease in energy efficiency. Compared to stationary air conditioners, portable air conditioners are used in significantly more dynamic scenarios. Their frequent relocation makes frosting more complex and unpredictable. Furthermore, the structural limitations of portable air conditioners exacerbate the defrosting challenge. Their compact design makes the condensate collection and treatment system more sensitive to changes in orientation. During relocation, condensate easily splashes onto the evaporator surface, and this residual moisture quickly freezes into frost in low-temperature environments, further worsening the frosting situation. Therefore, there is an urgent need for a technology that can accurately detect the precursors to frosting caused by relocation changes, intervene in advance, and adapt to dynamic scenarios.

[0003] For example, Chinese Patent Publication No. CN119374218A discloses a control method for an air conditioner, a volute control system, an air conditioner, and related devices, relating to the field of air conditioning equipment. The method includes: when the indoor air humidity is greater than a preset humidity threshold and the current coil temperature is not greater than a preset temperature threshold, controlling the volute body to move from a first position to a second position; when the indoor air humidity is not greater than the preset humidity threshold, or the current coil temperature is greater than the preset temperature threshold, controlling the volute body to move from a third position to a fourth position; after the volute body moves to the second position, adjusting the fan speed based on a first and second intake air speed; and after the volute body moves to the fourth position, adjusting the fan speed based on a third and fourth intake air speed. This application avoids condensate splashing by controlling the movement of the volute body to collect condensate, and by configuring the fan speed adjustment based on the intake air speed to regulate the air intake volume, it avoids a decrease in the air conditioning's cooling or defrosting effect.

[0004] Chinese Patent Publication No. CN119665380A discloses a portable air conditioner and its control method. The portable air conditioner includes an airflow control device and a condenser. The airflow control device is configured to allow either indoor airflow or outdoor airflow to exchange heat with the condenser. The portable air conditioner has at least two preset defrost protection programs to trigger a protection mechanism. The control method includes: acquiring the indoor ambient temperature and the outdoor ambient temperature; adjusting the airflow control device and / or the outdoor fan according to the indoor ambient temperature and the outdoor ambient temperature; selecting a defrost protection program to trigger the protection mechanism; and entering the defrost program at least in response to the triggering of the protection mechanism.

[0005] The following problems still exist in the existing technology:

[0006] Existing technologies do not take into account the phenomenon that condensate water can easily splash onto the evaporator surface and cause frost during the movement of portable air conditioners. Existing technologies cannot accurately capture the frost trend caused by changes in location, and cannot take targeted intervention measures in advance, resulting in problems such as delayed adjustment of portable air conditioners to cope with sudden environmental changes and energy waste. Summary of the Invention

[0007] To address this, the present invention provides a method and system for defrosting portable air conditioners, which overcomes the problems of existing technologies being unable to accurately capture the frosting trend caused by changes in location, and being unable to take targeted intervention measures in advance, resulting in the portable air conditioner's delayed adjustment to sudden environmental changes and energy waste.

[0008] To achieve the above objectives, the present invention provides a defrosting method for a portable air conditioner, comprising:

[0009] In response to the trigger signal of the change in the position of the portable air conditioner, the dripping position information of the condensate on the evaporator surface into the collection tray during the preset period of the position change is obtained, and the heat exchange fluctuation of the evaporator is determined based on the change in the dripping position information of the condensate.

[0010] In response to the heat exchange fluctuations in the evaporator, the frosting trend characterization quantity is determined based on the dripping position of the condensate during the continuous dripping process. The condensation performance trend of the evaporator is determined based on the numerical law analysis of the trend characterization sequence composed of the frosting trend characterization quantity.

[0011] Based on the condensation performance trend, the strategy for pre-defrosting the evaporator is selected to be adjusting the valve opening of the condensate in the collection tray into the condenser cooling pipe, or adjusting the tilt direction of the collection tray.

[0012] Furthermore, the process of determining the period of impact of a location change based on a location change trigger signal of a portable air conditioner includes:

[0013] Acquire the electrical signal from the accelerometer inside the portable air conditioner, and determine the position change trigger signal based on the electrical signal from the accelerometer;

[0014] The start time of the time period is determined by taking the end time of the trigger signal for the change in the location of the portable air conditioner as the start time of the time period, and the time period of the preset duration is determined as the time period affected by the change in location.

[0015] Furthermore, the process of determining the dripping location information of condensate droplets from the evaporator surface into the collection tray includes:

[0016] Establish a rectangular coordinate system on the plane containing the collection tray, taking any point on the edge of the collection tray outline as the origin;

[0017] Obtain the coordinates of the droplet position in the rectangular coordinate system where the condensate on the evaporator surface falls.

[0018] Furthermore, the process of determining the changes in the location information of the condensate dripping includes:

[0019] Record the coordinates of the dripping position of the condensate during the continuous dripping process under the influence of position changes in a chronological order;

[0020] Determine the time interval between adjacent droplet position coordinates in the time sequence;

[0021] The standard deviation of the interval distance is calculated based on the distance between adjacent drop position coordinates in several time series.

[0022] Furthermore, the process of determining the heat exchange fluctuations in the evaporator includes:

[0023] The standard deviation of the interval distance is compared with a preset standard deviation threshold of the interval distance;

[0024] If the standard deviation of the interval distance is greater than the threshold value of the standard deviation of the interval distance, it is determined that the evaporator is experiencing heat exchange fluctuations.

[0025] Furthermore, the process of determining the characterization of frosting trend based on the dripping position of condensate during continuous dripping includes:

[0026] The first and second condensing ends of the evaporator are determined based on the distance between the evaporator and the horizontal ground.

[0027] Determine the distance between the coordinates of the condensate dripping location and the marked edge of the collection tray, and define the distance as the frosting trend characterization quantity;

[0028] The first condensing end is the end of the evaporator that is furthest from the horizontal ground, and the second condensing end is the end of the evaporator that is furthest from the horizontal ground; the marked edge is the edge of the collection tray that is furthest from the first condensing end.

[0029] Furthermore, the process of determining the condensation performance trend of the evaporator includes:

[0030] Several frosting trend indicators are combined into a trend indicator series according to the dripping sequence of condensate;

[0031] If the trend characterization sequence satisfies the numerical regularity analysis conditions, then the condensation performance trend of the evaporator is determined to be the first condensation performance trend.

[0032] If the trend characterization sequence does not meet the conditions for numerical regularity analysis, then the condensation performance trend of the evaporator is determined to be the second condensation performance trend.

[0033] The numerical pattern analysis condition is that the trend representation sequence is a decreasing sequence.

[0034] Furthermore, a pre-defrosting strategy for the evaporator is selected based on the aforementioned condensation performance trend, wherein,

[0035] If the evaporator's condensation performance trend is the first condensation performance trend, then the selected pre-defrosting strategy is to adjust the valve opening of the condensate in the collection tray into the condenser cooling pipe.

[0036] If the evaporator's condensation trend is the second condensation trend, then the selected pre-defrosting strategy is to adjust the tilt direction of the collection tray.

[0037] Furthermore, the adjustment amount of the valve opening is determined based on the average value of the differences between several groups of adjacent frosting trend representation values ​​in the trend representation series;

[0038] The process of determining the tilt direction includes controlling the collection tray to tilt at a preset angle toward the direction of the first or second condensing end of the evaporator.

[0039] Furthermore, the present invention also provides a portable air conditioner defrosting system, comprising:

[0040] The air conditioner body includes a housing, an evaporator, a collection tray, and a condenser;

[0041] The collection tray is used to collect condensate dripping from the surface of the evaporator, and the condensate is introduced into the condenser cooling pipe to cool the condenser. The condenser cooling pipe is equipped with a valve with controllable valve opening.

[0042] The data sensing and detection module includes an accelerometer installed in the air conditioner body to obtain the trigger signal of the position change of the mobile air conditioner, and a scanning unit installed above the collection tray to scan the collection tray and obtain the dripping position information of the condensate.

[0043] The data analysis module, which is connected to the data sensing and detection module, includes a first processing unit and a second processing unit. The first processing unit is used to determine the heat exchange fluctuation of the evaporator.

[0044] The second processing unit is used to determine the trend characterization sequence and to determine the condensation performance trend of the evaporator based on the numerical regularity analysis results of the trend characterization sequence;

[0045] An energy-saving scheduling module, which is connected to the data analysis module, is used to select a pre-defrosting strategy for the evaporator based on the condensation performance trend.

[0046] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention determines the heat exchange fluctuation of the evaporator by acquiring the dripping position information of condensate droplets from the evaporator surface onto the collection tray during a preset period affected by positional changes; in response to the heat exchange fluctuations of the evaporator, it determines the condensation performance trend of the evaporator based on the numerical law analysis results of the trend representation series composed of frosting trend characterization quantities; and selects a pre-defrosting strategy for the evaporator based on the condensation performance trend, such as adjusting the valve opening of the condensate in the collection tray into the condenser cooling pipe, or adjusting the tilt direction of the collection tray. Furthermore, this achieves accurate capture of frosting trends caused by positional changes, allowing for proactive intervention to prevent condensate from splashing onto the evaporator surface and causing frosting due to the movement of the portable air conditioner, thus improving the timeliness of the portable air conditioner's adjustment to sudden environmental changes and its energy-saving performance.

[0047] Furthermore, during the period affected by the change in the position of the portable air conditioner, this invention continuously records the specific position coordinates of each drop of condensate in the coordinate system of the collection tray, with time sequence as the axis. First, the position change is converted into an interval distance by calculating the distance between adjacent time sequence drop coordinates. Then, the standard deviation of multiple sets of adjacent interval distances is calculated. The standard deviation index reflects the dispersion of the condensate drop position. If the standard deviation is small, it indicates that the drop position is concentrated and the distribution is stable, corresponding to a stable heat exchange state of the evaporator. If the standard deviation is large, it indicates that the drop position changes significantly, and the evaporator may experience unstable heat exchange efficiency due to the position change. This improves the system's ability to accurately capture the frosting trend caused by position changes.

[0048] Furthermore, this invention clarifies the spatial orientation of the evaporator by the difference in distance between the evaporator and the horizontal ground. The end furthest from the ground is defined as the first condensing end, and the end closest to the ground is defined as the second condensing end. This constructs a natural accumulation path for condensate on the evaporator surface, i.e., flowing from the first condensing end to the second condensing end. Those skilled in the art should understand that during normal condensation, the rate of condensate generation affects the dripping position: when the condensate generation rate is fast, the condensate drips due to gravity during its accumulation path from the first condensing end to the second condensing end, and the landing point will be biased towards the marked edge of the collection tray. In this state, the distance between the dripping position coordinates and the marked edge is small; when the condensate generation rate is slow, the condensate will continue to accumulate to the second condensing end, the lowest point of the evaporator, before dripping, and the landing point will be far from the marked edge. In this state, the distance between the dripping position coordinates and the marked edge is large. Furthermore, evaporator frost directly slows down the rate of local condensation, causing the dripping position to shift away from the marked edge. Therefore, defining the actual distance between the dripping position coordinates of each drop of condensation and the marked edge as the frost trend characterization quantity quantifies the change in condensation rate caused by frost, thereby achieving accurate capture of the frost trend caused by positional changes.

[0049] Furthermore, when determining that the evaporator is in the first condensation trend, the larger the average value of the adjacent differences in the trend characterization series, the faster the frost trend characterization quantity decreases. That is, the faster the condensate generation and dripping speed is, the faster the condensate accumulation speed in the collection tray also increases. At this time, it is necessary to quickly drain the condensate to avoid overflow, and to maximize the utilization of the condensate to achieve energy saving. Therefore, the system dynamically matches the valve opening adjustment amount according to the average value of the difference. The larger the average value of the difference, the larger the valve opening is adjusted. On the one hand, it can quickly guide the excess condensate in the collection tray into the condenser cooling pipe to avoid the problem of condensate frosting on other parts due to overflow. On the other hand, this condensate can directly cool the condenser, reducing energy consumption while quickly handling condensate, and improving the timeliness of the portable air conditioner in response to sudden environmental changes and its energy-saving performance.

[0050] Furthermore, when determining that the evaporator is exhibiting a second condensation trend, the present invention, based on the actual abnormal distribution of condensate, selects to tilt the collection tray at a preset angle towards the first or second condensation end. If the frequency of condensate dripping near the first condensation end is high per unit time, the collection tray is tilted towards the first condensation end, guiding the condensate in the collection tray to accumulate on that side, preventing frost formation on the dry area due to water droplets splashing onto that side. Similarly, if the frequency of condensate dripping near the second condensation end is high per unit time, the collection tray is tilted towards the second condensation end, guiding the condensate in the collection tray to accumulate on that side, preventing frost formation on the dry area due to water droplets splashing onto that side. Subsequent condensate dripping from the evaporator will fall directly into this accumulation area, preventing splashing onto other components and forming new frost. Simultaneously, the tilted collection tray also reduces the splashing range caused by condensate dripping directly onto the collection tray, preventing splashing onto other components and forming new frost, thus improving the portable air conditioner's adaptability to sudden environmental changes and its energy-saving performance. Attached Figure Description

[0051] Figure 1 Step-by-step diagram of how to defrost a portable air conditioner;

[0052] Figure 2 A flowchart illustrating the steps for determining the change in the dripping position information of condensate in an embodiment of the present invention;

[0053] Figure 3 This is a simplified structural diagram of the internal structure of the air conditioner body according to an embodiment of the present invention;

[0054] Figure 4 A logic flowchart for selecting a pre-defrosting strategy in an embodiment of the present invention;

[0055] Figure 5 This is a system block diagram of a portable air conditioner defrosting system according to an embodiment of the present invention;

[0056] In the diagram: 1-Evaporator, 2-Collection tray, 3-Condenser, 4-First condensing end, 5-Second condensing end, 6-Marked edge. Detailed Implementation

[0057] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0058] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0059] It should be noted that in the description of this invention, the terms "upper," "lower," "inner," "outer," etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0060] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] Please see Figure 1 The diagram shows the steps of a portable air conditioner defrosting method according to an embodiment of the present invention. The portable air conditioner defrosting method of the present invention includes:

[0062] Step S100: In response to the position change trigger signal of the portable air conditioner, obtain the dripping position information of condensate on the evaporator surface falling into the collection tray during the preset position change period, and determine the heat exchange fluctuation of the evaporator based on the change of the condensate dripping position information.

[0063] Step S200: In response to the heat exchange fluctuations in the evaporator, the frosting trend characterization quantity is determined based on the dripping position of the condensate during the continuous dripping process. The condensation performance trend of the evaporator is determined based on the numerical law analysis results of the trend characterization sequence composed of the frosting trend characterization quantity.

[0064] Step S300: Based on the condensation performance trend, the strategy for pre-defrosting the evaporator is selected as either adjusting the valve opening of the condensate in the collection tray into the condenser cooling pipe, or adjusting the tilt direction of the collection tray.

[0065] Specifically, the present invention does not limit the valve opening degree and the posture tilting method of the collection tray. In the implementation of the present invention, the valve opening degree of the solenoid valve set on the cooling pipe of the condenser can be determined by adjusting the magnitude of the input current, and the posture tilting of the collection tray can be achieved by the transmission mechanism driven by the motor. This is the existing technical means, and will not be described in detail here.

[0066] Specifically, the process of determining the period of impact of a location change based on a location change trigger signal of a portable air conditioner includes:

[0067] Acquire the electrical signal from the accelerometer inside the portable air conditioner, and determine the position change trigger signal based on the electrical signal from the accelerometer;

[0068] The start time of the time period is determined by taking the end time of the trigger signal for the change in the location of the portable air conditioner as the start time of the time period, and the time period of the preset duration is determined as the time period affected by the change in location.

[0069] In this invention, when the combined acceleration detected by the accelerometer exceeds 1.1g, the system sends a position change trigger signal; when the combined acceleration does not exceed 1.1g, the position change trigger signal is terminated. Using the accelerometer to detect the movement of the device is existing technology and will not be described in detail here.

[0070] In this invention, the preset duration of the period affected by the change in location can be set by those skilled in the art. Preferably, the preset duration of the period affected by the change in location can be set to 5 minutes.

[0071] The portable air conditioner uses a built-in accelerometer to collect electrical signals generated by the device's movement in real time. When the characteristics of the electrical signal meet the set standards, the position of the portable air conditioner is determined. By capturing the positional changes of the portable air conditioner and defining the period of influence, a detection time window is provided to determine whether the condensation process of the condensate on the evaporator surface has changed. After the position of the portable air conditioner changes, the airflow and temperature field distribution around the portable air conditioner will change accordingly. These factors may affect the heat exchange process of the evaporator, which may lead to changes in the amount and rate of condensate generation. The preset period of influence, starting from the end of the position change, determines the key period during which the evaporator may experience fluctuations in the condensation state due to the positional change.

[0072] Specifically, the process of determining the location of condensate droplets from the evaporator surface that fall into the collection tray includes:

[0073] Establish a rectangular coordinate system on the plane containing the collection tray, taking any point on the edge of the collection tray outline as the origin;

[0074] Obtain the coordinates of the droplet position in the rectangular coordinate system where the condensate on the evaporator surface falls.

[0075] Specifically, in this invention, a laser scanner can be used to scan the surface of the collection tray by emitting a laser beam, identify the contour edge of the collection tray, select any point on the edge as the origin of the coordinate system, and then establish a complete rectangular coordinate system by taking two mutually perpendicular directions in the plane of the collection tray as the X-axis and Y-axis. When condensate drips from the evaporator, the water droplets will block the laser beam, causing the reflected signal received by the scanner at the corresponding position to weaken or be interrupted, resulting in missing points. The system can capture these missing points in real time and convert their spatial positions into coordinates by combining them with the established rectangular coordinate system.

[0076] Specifically, please refer to Figure 2 The diagram illustrates the steps for determining the change in the dripping position information of condensate water according to an embodiment of the present invention. The process for determining the change in the dripping position information of condensate water includes:

[0077] Step S101: Record the coordinates of the dripping position of the condensate during the continuous dripping process under the influence of position change in a time sequence.

[0078] Step S102: Determine the interval distance between adjacent drop position coordinates in the time sequence;

[0079] Step S103: Calculate the standard deviation of the interval distance based on the interval distance between several sets of adjacent drop position coordinates in the time series.

[0080] Specifically, the process of determining the heat exchange fluctuation of the evaporator includes:

[0081] The standard deviation of the interval distance is compared with a preset standard deviation threshold of the interval distance;

[0082] If the standard deviation of the interval distance is less than or equal to the threshold of the standard deviation of the interval distance, it is determined that the evaporator has not experienced heat exchange fluctuations.

[0083] If the standard deviation of the interval distance is greater than the threshold value of the standard deviation of the interval distance, it is determined that the evaporator is experiencing heat exchange fluctuations.

[0084] In this invention, the preset standard deviation threshold for the interval distance can be set by those skilled in the art based on the size of the collection tray. Preferably, the standard deviation threshold for the interval distance L0 = δ × L, where L is the longest length of the outline edge of the collection tray, δ is the value factor for the standard deviation threshold for the interval distance, and the value range of δ is [0.15, 0.2]. The value of δ can be set to 0.18.

[0085] Understandably, during the period affected by the change in the location of the portable air conditioner, the system continuously records the specific coordinates of each drop of condensate in the coordinate system of the collection tray, using time sequence as the axis. First, the position change is converted into an interval distance by calculating the distance between adjacent time sequence drop coordinates. Then, the standard deviation of multiple sets of adjacent interval distances is calculated. The standard deviation index reflects the dispersion of the condensate drop position. If the standard deviation is small, it indicates that the drop position is concentrated and the distribution is stable, corresponding to a stable heat exchange state of the evaporator. If the standard deviation is large, it indicates that the drop position changes significantly, and the evaporator may experience unstable heat exchange efficiency due to the position change. This improves the system's ability to accurately capture the frosting trend caused by position changes.

[0086] Specifically, the process of determining the characterization of frosting trend based on the dripping position of condensate during continuous dripping includes:

[0087] The first and second condensing ends of the evaporator are determined based on the distance between the evaporator and the horizontal ground.

[0088] Determine the distance between the coordinates of the condensate dripping location and the marked edge of the collection tray, and define the distance as the frosting trend characterization quantity;

[0089] The first condensing end is the end of the evaporator that is furthest from the horizontal ground, and the second condensing end is the end of the evaporator that is furthest from the horizontal ground; the marked edge is the edge of the collection tray that is furthest from the first condensing end.

[0090] Please see Figure 3 As shown, it is a simplified structural diagram of the air conditioner body in an embodiment of the present invention. The evaporator 1 is set at an incline with respect to the horizontal ground. The collection tray 2 is set at the bottom of the evaporator 1, and the condenser 3 is set at the bottom of the collection tray 2. According to the distance between each end of the evaporator 3 and the horizontal ground, the end with the largest distance from the horizontal ground is determined as the first condensing end 4, the end with the smallest distance from the horizontal ground is determined as the second condensing end 5, and the edge with the smallest distance from the first condensing end among the several edges of the collection tray is determined as the marking edge 6.

[0091] In this invention, the method for determining the distance between each end of the evaporator and the horizontal ground is not limited. Preferably, a three-dimensional model of the evaporator can be pre-established using a laser scanner to determine the coordinates of each end, and the distance from each end of the evaporator to the horizontal ground can be calculated using the coordinates.

[0092] Understandably, the spatial orientation of the evaporator is determined by the difference in distance between the evaporator and the horizontal ground. The end furthest from the ground is defined as the first condensing end, and the end closest to the ground is defined as the second condensing end. This constructs a natural accumulation path for condensate on the evaporator surface, i.e., flowing from the first condensing end to the second condensing end. Those skilled in the art should understand that during normal condensation, the rate of condensate generation affects the dripping position: when the condensate generation rate is fast, the condensate drips due to gravity during its accumulation path from the first condensing end to the second condensing end, and the landing point will be biased towards the marked edge of the collection tray. In this state, the distance between the dripping position coordinates and the marked edge is small; when the condensate generation rate is slow, the condensate will continue to accumulate to the second condensing end, the lowest point of the evaporator, before dripping, and the landing point will be far from the marked edge. In this state, the distance between the dripping position coordinates and the marked edge is large. Therefore, the actual distance between the dripping position coordinates of each drop of condensate and the marked edge is defined as a frosting trend characterization quantity, quantifying the change in condensation rate caused by frosting.

[0093] Specifically, please refer to Figure 4 As shown, it is a logic flowchart for selecting the pre-defrosting strategy in an embodiment of the present invention. The process of determining the condensation performance trend of the evaporator includes:

[0094] Several frosting trend indicators are combined into a trend indicator series according to the dripping sequence of condensate;

[0095] If the trend characterization sequence satisfies the numerical regularity analysis conditions, then the condensation performance trend of the evaporator is determined to be the first condensation performance trend.

[0096] If the trend characterization sequence does not meet the conditions for numerical regularity analysis, then the condensation performance trend of the evaporator is determined to be the second condensation performance trend.

[0097] The numerical pattern analysis condition is that the trend representation sequence is a decreasing sequence.

[0098] Understandably, by judging whether the trend sequence conforms to the numerical pattern of a decreasing sequence, the condensation trend of the evaporator can be inversely deduced. Essentially, this correlates the change in the characteristic quantity with the condensation state. If the trend sequence is decreasing, it means the distance between the condensate droplet position and the marked edge is continuously decreasing, corresponding to a continuously accelerating condensate generation rate, which is identified as the first condensation trend. If the sequence does not meet the decreasing condition, it indicates that the condensate droplet distance is irregular, corresponding to an unstable condensate generation rate, which is identified as the second condensation trend, providing a scientific basis for taking targeted intervention measures.

[0099] Specifically, a pre-defrosting strategy for the evaporator is selected based on the condensation performance trend, wherein...

[0100] If the evaporator's condensation performance trend is the first condensation performance trend, then the selected pre-defrosting strategy is to adjust the valve opening of the condensate in the collection tray into the condenser cooling pipe.

[0101] If the evaporator's condensation trend is the second condensation trend, then the selected pre-defrosting strategy is to adjust the tilt direction of the collection tray.

[0102] Specifically, the adjustment amount of the valve opening is determined based on the average value of the differences between several groups of adjacent frosting trend representation values ​​in the trend representation series;

[0103] In the implementation of this invention, the adjustment amount of valve opening is positively correlated with the average value of the difference between several groups of adjacent frost trend representation values ​​in the trend representation series. That is, the larger the average value of the difference between several groups of adjacent frost trend representation values ​​in the trend representation series, the larger the adjustment amount of valve opening.

[0104] For example, if the average difference between several adjacent frost trend values ​​in the trend characterization series is less than or equal to the first average reference value r1, then the valve opening adjustment is +5%;

[0105] If the average difference between several adjacent frost trend values ​​in the trend characterization series is greater than the first average reference value r1 and less than or equal to the second average reference value r2, then the valve opening adjustment is +10%.

[0106] If the average difference between several adjacent frost trend values ​​in the trend characterization series is greater than the second average reference value r2, then the valve opening adjustment is +15%.

[0107] Among them, the first average reference value r1 and the second average reference value r2 are based on the average of the differences between several groups of adjacent frost trend representation values ​​in several trend representation series in historical data. av Confirmed; Here is one method of value selection: the first average reference value r1 = 1.1 × r av The second average reference value is r² = 1.25 × r. av Understandably, the upper limit of valve opening is 100%.

[0108] Specifically, the process of determining the tilt direction includes controlling the collection tray to tilt at a preset angle toward the direction of the first or second condensing end of the evaporator.

[0109] In this invention, depending on the actual abnormal distribution of condensate, the collection tray can be tilted at a preset angle towards either the first or second condensing end. Using the midpoint between the first and second condensing ends of the evaporator as the boundary, the frequency of condensate dripping near the first condensing end and the frequency of condensate dripping near the second condensing end are obtained per unit time. The comparison of the dripping frequencies on both sides determines which end of the evaporator the collection tray should tilt towards. If the frequency of condensate dripping near the first condensing end is high per unit time, the collection tray is tilted towards the first condensing end to guide the condensate in the collection tray to accumulate on that side, preventing frost formation on the dry area due to water droplets splashing onto that side. Similarly, if the frequency of condensate dripping near the second condensing end is high per unit time, the collection tray is tilted towards the second condensing end to guide the condensate in the collection tray to accumulate on that side, preventing frost formation on the dry area due to water droplets splashing onto that side.

[0110] In this invention, to avoid the condensate in the collection tray from spilling due to an excessively large tilt angle, and to avoid the condensate in the collection tray from accumulating insignificantly due to an excessively small tilt angle, the preset angle value can be 5° relative to the horizontal ground.

[0111] Understandably, when determining that the evaporator is in the first condensation trend, the larger the average value of the adjacent differences in the trend representation series, the faster the frost trend representation decreases. This means that the rate of condensate generation and dripping is more pronounced, and the rate of condensate accumulation in the collection tray also increases. At this point, it is necessary to quickly drain the condensate to prevent overflow, and to maximize the utilization of the condensate to achieve energy saving. Therefore, the system dynamically matches the valve opening adjustment based on the average value of the difference. The larger the average value of the difference, the larger the valve opening is adjusted. On the one hand, this can quickly guide excess condensate in the collection tray into the condenser cooling pipe, avoiding the problem of condensate overflow causing frost on other components. On the other hand, this condensate can directly cool the condenser, reducing energy consumption while quickly handling the condensate, thus improving the timeliness of the portable air conditioner's adjustment to sudden environmental changes and its energy-saving performance.

[0112] Understandably, when the present invention determines that the evaporator is in the second condensation trend, it selects to tilt the collection tray at a preset angle towards the direction of the first or second condensation end based on the actual abnormal distribution of condensate water. Subsequently, the condensate water dripping from the evaporator will fall directly into this water accumulation area, avoiding splashing onto other components and forming a new frost layer. At the same time, the tilted collection tray can also reduce the splash range caused by condensate water dripping directly onto the collection tray, avoiding splashing onto other components and forming a new frost layer, thus improving the timeliness of the portable air conditioner in response to sudden environmental changes and its energy-saving performance.

[0113] Specifically, please refer to Figure 5As shown, it is a system block diagram of a portable air conditioner defrosting system according to an embodiment of the present invention. The present invention also provides a portable air conditioner defrosting system, including:

[0114] The air conditioner body includes a housing, an evaporator 1, a collection tray 2, and a condenser 3;

[0115] The collection tray 2 is used to collect the condensate dripping from the surface of the evaporator, and the condensate is introduced into the condenser cooling pipe to cool the condenser. The condenser cooling pipe is equipped with a valve with controllable valve opening.

[0116] Specifically, the evaporator, collection tray, and condenser in this invention are common components in existing portable air conditioners, and their effects are not limited here.

[0117] Specifically, the present invention does not limit the structure of the valve on the condenser cooling pipe. It can be a solenoid valve that determines the valve opening degree according to the magnitude of the input current. This is the prior art and will not be described in detail here.

[0118] The data sensing and detection module includes an accelerometer installed in the air conditioner body to obtain the trigger signal of the position change of the mobile air conditioner, and a scanning unit installed above the collection tray to scan the collection tray and obtain the dripping position information of the condensate.

[0119] Specifically, this invention does not limit the specific structure of the accelerometer. Accelerometers are widely used in vehicles and other mobile equipment to detect the displacement of such equipment, and will not be described in detail here.

[0120] Specifically, the present invention does not limit the specific structure of the scanning unit. Preferably, it can be a laser scanner to scan the collection tray, determine the outline edge of the collection tray and obtain the coordinates of the dripping position of the condensate based on the point cloud data obtained from the scan. Modeling and identification using a laser scanner is an existing technology and will not be described in detail here.

[0121] The data analysis module, which is connected to the data sensing and detection module, includes a first processing unit and a second processing unit. The first processing unit is used to determine the heat exchange fluctuation of the evaporator.

[0122] The second processing unit is used to determine the trend characterization sequence and to determine the condensation performance trend of the evaporator based on the numerical regularity analysis results of the trend characterization sequence;

[0123] An energy-saving scheduling module, which is connected to the data analysis module, is used to select a pre-defrosting strategy for the evaporator based on the condensation performance trend.

[0124] Specifically, the present invention does not limit the specific structure of the data analysis module and the energy-saving scheduling module. They or their units can be constructed using logic components. The logic components can be field-programmable logic components, microprocessors, processors used in computers, etc. The logic components store relevant computer program code. When the computer program code is run, the computer executes the above-mentioned related method steps to realize the above-mentioned mobile air conditioner defrosting method.

[0125] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0126] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for defrosting a portable air conditioner, characterized in that, include: In response to the trigger signal of the change in the position of the portable air conditioner, the dripping position information of the condensate on the evaporator surface into the collection tray during the preset period of the position change is obtained, and the heat exchange fluctuation of the evaporator is determined based on the change in the dripping position information of the condensate. In response to the heat exchange fluctuations in the evaporator, the frosting trend characterization quantity is determined based on the dripping position of the condensate during the continuous dripping process. The condensation performance trend of the evaporator is determined based on the numerical law analysis of the trend characterization sequence composed of the frosting trend characterization quantity. Based on the condensation performance trend, the strategy for pre-defrosting the evaporator is selected to be adjusting the valve opening of the condensate in the collection tray into the condenser cooling pipe, or adjusting the tilt direction of the collection tray.

2. The defrosting method for a portable air conditioner according to claim 1, characterized in that, The process of determining the time period affected by a location change based on a trigger signal from a mobile air conditioner's location change includes: Acquire the electrical signal from the accelerometer inside the portable air conditioner, and determine the position change trigger signal based on the electrical signal from the accelerometer; The start time of the time period is determined by taking the end time of the trigger signal for the change in the location of the portable air conditioner as the start time of the time period, and the time period of the preset duration is determined as the time period affected by the change in location.

3. The defrosting method for a portable air conditioner according to claim 2, characterized in that, The process of determining the location of condensate droplets from the evaporator surface that fall into the collection tray includes: Establish a rectangular coordinate system on the plane containing the collection tray, taking any point on the edge of the collection tray outline as the origin; Obtain the coordinates of the droplet position in the rectangular coordinate system where the condensate on the evaporator surface falls.

4. The defrosting method for a portable air conditioner according to claim 3, characterized in that, The process of determining changes in the location of condensate dripping includes: Record the coordinates of the dripping position of the condensate during the continuous dripping process under the influence of position changes in a chronological order; Determine the time interval between adjacent droplet position coordinates in the time sequence; The standard deviation of the interval distance is calculated based on the distance between adjacent drop position coordinates in several time series.

5. The defrosting method for a portable air conditioner according to claim 4, characterized in that, The process of determining the heat exchange fluctuation of the evaporator includes: The standard deviation of the interval distance is compared with a preset standard deviation threshold of the interval distance; If the standard deviation of the interval distance is greater than the threshold value of the standard deviation of the interval distance, it is determined that the evaporator is experiencing heat exchange fluctuations.

6. The defrosting method for a portable air conditioner according to claim 4, characterized in that, The process of determining the characterization of frosting trend based on the dripping position of condensate during continuous dripping includes: The first and second condensing ends of the evaporator are determined based on the distance between the evaporator and the horizontal ground. Determine the distance between the coordinates of the condensate dripping location and the marked edge of the collection tray, and define the distance as the frosting trend characterization quantity; The first condensing end is the end of the evaporator that is furthest from the horizontal ground, and the second condensing end is the end of the evaporator that is furthest from the horizontal ground; the marked edge is the edge of the collection tray that is furthest from the first condensing end.

7. The defrosting method for a portable air conditioner according to claim 6, characterized in that, The process of determining the condensation performance trend of the evaporator includes: Several frosting trend indicators are combined into a trend indicator series according to the dripping sequence of condensate; If the trend characterization sequence satisfies the numerical regularity analysis conditions, then the condensation performance trend of the evaporator is determined to be the first condensation performance trend. If the trend characterization sequence does not meet the conditions for numerical regularity analysis, then the condensation performance trend of the evaporator is determined to be the second condensation performance trend. The numerical pattern analysis condition is that the trend representation sequence is a decreasing sequence.

8. The defrosting method for a portable air conditioner according to claim 7, characterized in that, Based on the aforementioned condensation performance trend, a pre-defrosting strategy for the evaporator is selected, wherein... If the evaporator's condensation performance trend is the first condensation performance trend, then the selected pre-defrosting strategy is to adjust the valve opening of the condensate in the collection tray into the condenser cooling pipe. If the evaporator's condensation trend is the second condensation trend, then the selected pre-defrosting strategy is to adjust the tilt direction of the collection tray.

9. The defrosting method for a portable air conditioner according to claim 8, characterized in that, The adjustment amount of the valve opening is determined based on the average of the differences between several groups of adjacent frosting trend representation values ​​in the trend representation series. The process of determining the tilt direction includes controlling the collection tray to tilt at a preset angle toward the direction of the first or second condensing end of the evaporator.

10. A portable air conditioner defrosting system, used to perform the portable air conditioner defrosting method according to any one of claims 1-9, characterized in that, include: The air conditioner body includes a housing, an evaporator, a collection tray, and a condenser; The collection tray is used to collect condensate dripping from the surface of the evaporator, and the condensate is introduced into the condenser cooling pipe to cool the condenser. The condenser cooling pipe is equipped with a valve with controllable valve opening. The data sensing and detection module includes an accelerometer installed in the air conditioner body to obtain the trigger signal of the position change of the mobile air conditioner, and a scanning unit installed above the collection tray to scan the collection tray and obtain the dripping position information of the condensate. The data analysis module, which is connected to the data sensing and detection module, includes a first processing unit and a second processing unit. The first processing unit is used to determine the heat exchange fluctuation of the evaporator. The second processing unit is used to determine the trend characterization sequence and to determine the condensation performance trend of the evaporator based on the numerical regularity analysis results of the trend characterization sequence; An energy-saving scheduling module, which is connected to the data analysis module, is used to select a pre-defrosting strategy for the evaporator based on the condensation performance trend.

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