A control method and system of a gas tank, a terminal and a storage medium

Abstract

The application relates to a control method and system of a gas tank, a terminal and a storage medium, and relates to the technical field of power equipment. The method comprises the following steps: acquiring the temperature and humidity in the gas tank, and calculating the moisture content according to the humidity; acquiring the pressure value of the gas tank; calculating the actual density of the gas in the gas tank according to the pressure value, the moisture content and the temperature; calculating the theoretical pressure difference range corresponding to the working frequency of the air blowing device based on the actual density; acquiring the gas pressure difference value on both sides of the filtering assembly through a pressure difference sensor; and generating a filter cotton replacement prompt information in the case that the gas pressure difference value exceeds the theoretical pressure difference range. According to the temperature and humidity sensor signal, the air blowing device is controlled to run, dry air treated by a dehumidifier is sent into the gas tank; meanwhile, the opening degree of an electromagnetic proportional valve is adjusted based on the feedback of a pressure detection device, the wet hot gas is discharged, the gas replacement is realized through coordination of air intake and air exhaust, the positive pressure value of the gas tank is maintained, and the cooling and dehumidification effects are achieved.

Description

A control method, system, terminal, and storage medium for an air box. Technical Field

[0001] This application relates to the field of power equipment technology, and in particular to a control method, system, terminal and storage medium for a gas box. Background Technology

[0002] In the modern power equipment operation and maintenance system, the gas tank monitoring system is a key technology supporting the safety of the internal environment of the gas tank and the improvement of the accuracy of fault diagnosis.

[0003] In related technologies, the air box monitoring system is based on preset fixed threshold logic. By collecting basic environmental parameters inside the box and matching them with a preset single action command library, it triggers the start and stop of the blower or generates a simple alarm, and finally guides maintenance personnel to perform on-site inspections or component replacements.

[0004] Regarding the aforementioned technologies, when judging the condition of the filter cotton or the abnormality of the air box environment, there are problems such as insufficient accuracy of fault identification and limited level of intelligence, resulting in delayed response and inaccurate maintenance decisions, and difficulty in effectively controlling the temperature and humidity inside the air box, affecting the cooling and dehumidification effect. Summary of the Invention

[0005] To ensure the safety of the internal environment of the gas box and improve the accuracy of fault diagnosis, this application provides a control method, system, terminal and storage medium for the gas box.

[0006] In a first aspect, this application provides a method for controlling a gas box, employing the following technical solution:

[0007] A method for controlling a gas box includes:

[0008] The temperature and humidity inside the air chamber are obtained by temperature and humidity sensors, and the moisture content is calculated based on the temperature and humidity.

[0009] The pressure value of the air box is obtained through a pressure detection device;

[0010] Calculate the actual density of the gas inside the gas box based on the pressure value, moisture content, and temperature;

[0011] Based on the actual density, calculate the theoretical pressure difference range corresponding to the operating frequency of the blower.

[0012] The gas pressure difference across the filter assembly is obtained using a differential pressure sensor.

[0013] If the gas pressure difference exceeds the theoretical pressure difference range, a filter cotton replacement reminder message will be generated.

[0014] By adopting the above technical solution, the temperature and humidity inside the gas chamber are obtained, the actual gas density is calculated, and the theoretical pressure difference range of the filter components under the current operating conditions is determined in conjunction with the operating frequency of the blower. When the measured pressure difference exceeds this range, a filter replacement reminder is triggered. This solution significantly improves the accuracy of fault diagnosis, reduces human error and ineffective inspections, and provides a reliable foundation for the regulation of temperature and humidity inside the gas chamber and effective dehumidification.

[0015] Optionally, the outlet temperature and operating current of the dehumidifier can be obtained;

[0016] A frost blockage signal is generated when the outlet temperature is higher than the temperature threshold and the operating current is higher than the current threshold.

[0017] Based on the frost blockage signal, the filter replacement prompt message is ignored, and the dehumidifier defrost program is started.

[0018] After starting the dehumidifier defrost program, reassess the dehumidifier's dehumidification status;

[0019] If the dehumidification process results in frost blockage, repeat the above two steps.

[0020] If the dehumidification mode is defrosting, the filter replacement reminder message will be unblocked, and the blower will be controlled to run in the forward direction.

[0021] By adopting the above technical solution, the outlet temperature and operating current of the dehumidifier are monitored, and the frost blockage status is identified by combining preset thresholds, thus blocking any false filter replacement prompts caused by this. Simultaneously, the blower is controlled to reverse to promote defrosting, and forward operation and normal diagnostic functions are restored after defrosting is confirmed. This solution significantly improves the accuracy of fault diagnosis, reduces false alarms and ineffective maintenance caused by frost blockage, and ensures that the dehumidifier promptly restores normal dehumidification capacity after defrosting, avoiding disruption to the continuity and reliability of temperature and humidity control within the air chamber due to dehumidification interruption.

[0022] Optionally, after the dehumidifier defrost program is started, the first reverse pressure difference value on both sides of the filter component is obtained within the first preset time after the blower reverses operation;

[0023] Determine whether the first reverse pressure differential exceeds the blockage threshold;

[0024] If so, the blower will continue to run in reverse, and within the second preset time after startup, the second reverse pressure difference value on both sides of the filter assembly will be obtained;

[0025] If the second reverse pressure differential value exceeds the blockage threshold, the blower is controlled to switch to forward operation, so that the blower operates at the highest working frequency and obtains the positive pressure differential value within the third preset time after startup.

[0026] If the positive pressure difference exceeds the high-frequency theoretical pressure difference range corresponding to the blower at its highest operating frequency, the filter component is determined to be hard-clogged.

[0027] Based on the hard blockage, the frost blockage operation is terminated, the shielding of the filter cotton replacement prompt message is removed, and a filter cotton replacement prompt message is generated.

[0028] By adopting the above technical solution, instantaneous and trend pressure difference values ​​are acquired in stages during the reverse phase of the blower. Combined with pressure difference verification under high airflow conditions during forward rotation, the system can distinguish between frost blockage and hard blockage of the filter cotton. Upon confirmation of hard blockage, the defrosting process is terminated and a filter cotton replacement prompt is triggered. This solution significantly improves the accuracy of fault identification, reduces ineffective operation and delayed processing due to misjudgment, and ensures that the filter components are repaired promptly when truly blocked, providing a smooth airflow path for subsequent ventilation and dehumidification processes.

[0029] Optionally, the actual operating current and actual rotational speed of the blower can be obtained;

[0030] Compare the actual operating current with the factory-calibrated operating current and calculate the current deviation rate.

[0031] Compare the actual speed with the factory-calibrated speed and calculate the speed deviation rate;

[0032] If the current deviation rate exceeds the current tolerance threshold or the speed deviation rate exceeds the speed tolerance threshold, the effective air volume is obtained based on the actual operating current and the actual speed.

[0033] Based on the effective air volume and actual density, the actual theoretical pressure difference range corresponding to the blower at the highest operating frequency is recalculated.

[0034] By adopting the above technical solution, the actual operating current and speed of the blower are obtained, and the performance status of the blower is evaluated in conjunction with the factory calibration parameters. When deviations exceed limits, the effective air volume and theoretical pressure difference range are corrected. Simultaneously, blockage judgment is performed based on the corrected pressure difference benchmark. This solution significantly improves the accuracy of filter clogging diagnosis, reduces false alarms and missed alarms caused by blower aging or changes in operating conditions, and avoids insufficient ventilation or dehumidification interruption due to misjudgment of airflow conditions, thereby ensuring the reliability of temperature and humidity control inside the air chamber.

[0035] Optionally, the gas pressure difference across the filter assembly and the theoretical pressure difference range corresponding to the gas pressure difference can be collected to form time series data;

[0036] Based on time series data, the relative deviation of the gas pressure difference value relative to the theoretical pressure difference range is calculated;

[0037] Calculate the rate of change of the relative deviation over N consecutive sampling periods, where N is an integer greater than 1;

[0038] When the rate of change exceeds a preset rate of change threshold, the operating current of the blower is obtained;

[0039] Perform the first judgment step, which includes combining the operating current and operating frequency to determine whether the effective air volume increases synchronously;

[0040] If so, it is determined to be an environmental parameter disturbance, and the theoretical pressure difference range is recalculated;

[0041] If not, an early warning message will be generated indicating that the filter cotton is deteriorating rapidly.

[0042] By employing the above technical solution, a time series of pressure differentials and their theoretical ranges for the filter components is collected. This time series is then used to identify the deterioration trend of the filter cotton performance, combined with the relative deviation change rate. The operating current and frequency of the blower are also linked to verify the airflow response. If the airflow does not increase synchronously, it is determined to be an environmental disturbance, and the theoretical pressure differential range is updated. If the airflow synchronization is abnormal, an early warning of accelerated filter cotton degradation is issued. This solution significantly improves the accuracy of early blockage identification, reduces false alarms caused by environmental fluctuations and missed detections of actual faults, and avoids a slow decline in ventilation capacity due to the hidden deterioration of the filter cotton. This ensures the airflow replacement efficiency within the air chamber and maintains the effectiveness of dehumidification and heat dissipation functions.

[0043] Optionally, the operating frequency of the continuous sampling points of the blower can be obtained;

[0044] Based on the operating frequency, the frequency change between adjacent consecutive sampling points is calculated to obtain the frequency change sequence;

[0045] Perform the second judgment step, which includes judging whether the absolute value of each frequency change in the frequency change sequence is lower than the stability threshold.

[0046] If not, pause the first judgment step and repeat the above three steps;

[0047] If so, the blower is determined to have entered a steady-state operation phase, and the first judgment step is executed.

[0048] By adopting the above technical solution, the operating frequency of the blower is obtained from continuous sampling points, the frequency change is calculated, and the stability of the blower's operating frequency is determined. The differential pressure and current correlation diagnosis is only performed after the blower has entered steady-state operation. The judgment is delayed during frequency fluctuations to avoid interference from unsteady-state data during frequency conversion transitions. This solution significantly improves the accuracy of blockage diagnosis and reduces false alarms caused by blower speed adjustments.

[0049] Optionally, the pressure value of the air box can be obtained through a pressure detection device;

[0050] If the pressure value is lower than the positive pressure value but higher than the critical value, the decision on whether to inflate the air box is based on whether a filter cotton replacement prompt message is generated.

[0051] If the judgment result is to generate a filter cotton replacement prompt message, then the inflation operation will be prohibited, and the filter cotton will be prompted to be replaced first.

[0052] If the result indicates that no filter replacement prompt has been generated, the inflation operation will be initiated until the air box reaches a positive pressure value.

[0053] By adopting the above technical solution, the positive pressure detection device obtains the pressure value of the air chamber and, combined with the judgment result of the filter cotton replacement prompt information, determines the inflation strategy: if it is confirmed that the filter cotton is not blocked, it initiates air replenishment to restore a slight positive pressure; if it is determined that the filter cotton is blocked, it prohibits inflation and prioritizes prompting the replacement of the filter cotton. This solution significantly improves the accuracy of air chamber pressure control and reduces safety hazards caused by blindly inflating to mask actual blockages.

[0054] Secondly, this application provides a control system for a gas box, which adopts the following technical solution:

[0055] A control system for a gas box, comprising:

[0056] The acquisition module is used to acquire temperature, humidity, and gas pressure difference values.

[0057] A memory for storing the program of the control method for the air box;

[0058] The processor and the program in the memory can be loaded and executed by the processor to implement the control method of the air box.

[0059] By adopting the above technical solution, the module acquires temperature, humidity and differential pressure data of the air box and filter components. The processor quickly executes logic such as blockage identification, frost blockage judgment and positive pressure linkage control. The complete environmental control program is solidified in the memory and runs reliably. It realizes the whole process from state perception to maintenance decision-making, which significantly improves the operation and maintenance response efficiency while ensuring the accuracy of fault diagnosis, and provides an efficient and reliable solution for intelligent operation and maintenance of power equipment.

[0060] Thirdly, this application provides a smart terminal, which adopts the following technical solution:

[0061] A smart terminal includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any one of 1 to 7 above.

[0062] Fourthly, this application provides a computer storage medium capable of storing corresponding programs, which facilitates ensuring the safety of the internal environment of the gas box and improving the accuracy of fault diagnosis. The technical solution adopted is as follows:

[0063] A computer-readable storage medium storing a computer program that can be loaded by a processor and executed any of the above-described air box control methods.

[0064] In summary, this application includes at least one of the following beneficial technical effects:

[0065] 1. The system acquires the temperature and humidity inside the gas chamber, calculates the actual gas density, and, in conjunction with the blower's operating frequency, determines the theoretical pressure difference range of the filter components under current operating conditions. When the measured pressure difference exceeds this range, a filter replacement reminder is triggered. This solution significantly improves the accuracy of fault diagnosis, reduces human error and ineffective inspections, and provides a reliable foundation for the regulation of temperature and humidity inside the gas chamber and effective dehumidification.

[0066] 2. A time series of pressure differentials and their theoretical ranges for the filter components is collected. This data, combined with the relative deviation rate of change, identifies the deterioration trend of the filter cotton performance. The operating current and frequency of the blower are then linked to verify the airflow response. If the airflow does not increase synchronously, it is determined to be an environmental disturbance, and the theoretical pressure differential range is updated. If the airflow is synchronously abnormal, an early warning of accelerated filter cotton degradation is issued. This solution significantly improves the accuracy of early blockage identification, reduces false alarms caused by environmental fluctuations and missed detections of actual faults, and avoids a slow decline in ventilation capacity due to the hidden deterioration of the filter cotton. This ensures the efficiency of airflow replacement within the air chamber and maintains the effectiveness of dehumidification and heat dissipation functions.

[0067] 3. Obtain the operating frequency of continuous sampling points of the blower, calculate the frequency change, and determine whether the blower's operating frequency is stable. Only after confirming that the blower has entered steady-state operation will the differential pressure and current correlation diagnosis be performed. The judgment is delayed during frequency fluctuations to avoid interference from unsteady-state data during frequency conversion transitions. This solution significantly improves the accuracy of blockage diagnosis and reduces false alarms caused by blower speed adjustments.

[0068] 4. If no filter replacement prompt is generated, control the blower to run in the forward direction. At this time, the forward check valve opens, allowing dry air processed by the dehumidifier and filter to enter the air box to restore and maintain the positive pressure value in the air box. Ensure that inflation is performed only when the filter is functioning normally and the airflow channel is unobstructed. Avoid overloading the blower due to forced inflation in a blocked state. At the same time, effectively block external humid air from entering the air box and reduce the frequency of unplanned shutdowns and manual intervention caused by the air box not being at a positive pressure value.

[0069] 5. An electromagnetic proportional valve is installed at the air outlet at the top of the air box, which adjusts the valve position according to the temperature and humidity signals detected by the temperature and humidity sensor. When the temperature or humidity exceeds the preset threshold, the opening degree of the electromagnetic proportional valve is increased to discharge the hot and humid gas inside the air box and improve exhaust efficiency. At the same time, the pressure detection device monitors the pressure status inside the air box in real time, and controls the blower to start while opening the positive check valve, so that the outside air enters the air box after being dried by the dehumidifier, realizing the orderly replacement of hot and humid gas discharge and dry gas replenishment. In the entire gas replacement process, through the cooperation of the electromagnetic proportional valve and the blower, the temperature and humidity inside the air box are effectively reduced, and the pressure value is prevented from dropping suddenly, ensuring that the air box always maintains a slight positive pressure and preventing the backflow of external humid air. Attached Figure Description

[0070] Figure 1 is a schematic flowchart of a gas box control method provided in an embodiment of this application.

[0071] Figure 2 is a schematic flowchart of a gas box reverse conversion defrosting method provided in an embodiment of this application.

[0072] Figure 3 is a flowchart illustrating a method for identifying hard blockage of filter cotton provided in an embodiment of this application.

[0073] Figure 4 is a flowchart illustrating a filter clogging diagnosis method based on effective airflow provided in an embodiment of this application.

[0074] Figure 5 is a flowchart illustrating an early warning method for filter cotton blockage provided in an embodiment of this application.

[0075] Figure 6 is a flowchart illustrating a steady-state monitoring method for a blower provided in an embodiment of this application.

[0076] Figure 7 is a schematic flowchart of an air box inflation method based on the state of filter cotton provided in an embodiment of this application.

[0077] Figure 8 is a schematic diagram of the structure of a gas box control system provided in an embodiment of this application.

[0078] Figure 9 is a schematic diagram of an air box provided in an embodiment of this application. Detailed Implementation

[0079] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to Figures 1 to 9 and embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit this application.

[0080] This application discloses a method for controlling an air box. Referring to Figure 1, the method includes:

[0081] Step S101: Obtain the temperature and humidity inside the air chamber using a temperature and humidity sensor, and calculate the moisture content based on the temperature and humidity.

[0082] A gas box is a closed gas-insulated container that relies on clean, dry gas as an electrical insulating medium. Its electrical performance is highly dependent on the humidity, cleanliness, and stable positive pressure environment of the gas.

[0083] An air inlet is located at the bottom of the air chamber, and an air outlet is located at the top. A dehumidifier, filter assembly, blower, reverse check valve, and forward check valve are sequentially arranged at the air inlet. The forward check valve is located at the interface between the air inlet and the air chamber. The reverse check valve is located on a bypass branch between the blower and the forward check valve. A differential pressure sensor is installed between the inlet and outlet sides of the filter assembly. An electromagnetic proportional valve is installed at the air outlet. A temperature and humidity sensor and a pressure detection device are installed inside the air chamber. The forward check valve... The valve opens when the blower is running in the forward direction, allowing dehumidified and filtered dry air to enter the air box to establish and maintain positive pressure inside the air box. The forward check valve closes when the blower is running in reverse to defrost, preventing gas in the air box from flowing back to the outside through the reverse direction of the blower. At the same time, the reverse check valve opens, and the airflow is discharged from the blower through the bypass branch, blown back into the dehumidifier through the filter assembly, and discharged to the outside from the dehumidifier inlet, ensuring that the positive pressure of the air box is maintained and defrosting is achieved during the reverse rotation of the blower. The electromagnetic proportional valve adjusts its position based on the temperature and humidity signals detected by the temperature and humidity sensor. When the temperature or humidity exceeds a preset threshold, the electromagnetic proportional valve is controlled to increase its opening degree to increase the air output and expel the hot and humid gas inside the air chamber. A pressure detection device monitors the pressure inside the air chamber and controls the operation of the blower on the intake side based on this pressure. External air is first processed by a dehumidifier and then sent into the air chamber through the blower to replenish dry gas and complete gas replacement. During gas replacement, the pressure inside the air chamber is monitored in real time to ensure a positive pressure level is maintained. The air chamber 911, air outlet 912, electromagnetic proportional valve 913, forward check valve 914, reverse check valve 915, blower 916, filter assembly 917, dehumidifier 918, and air inlet 919 can be referenced in Figure 9.

[0084] Moisture content refers to the physical quantity of moist air composition, specifically the mass of water vapor contained in one kilogram of dry air. The calculation of moisture content is based on measured temperature and humidity. First, the saturated water vapor pressure is determined from the temperature. Then, the actual partial pressure of water vapor is calculated by combining this with the relative humidity. The actual partial pressure of water vapor is calculated as P. v =∅∙P sat Where ∅ represents humidity, P v P is the actual partial pressure of water vapor. sat Given the saturated water vapor pressure, we finally substitute it into the formula d=K∙[P v / (PPv The moisture content is obtained by taking d as the moisture content, P as the local atmospheric pressure, and K as a dimensionless proportionality constant, which is taken as 622 here.

[0085] The calculated moisture content is compared with the preset dehumidification threshold. If the moisture content is greater than or equal to the dehumidification threshold, it is determined that the moisture content in the air chamber is too high, and dehumidification operation needs to be initiated and a dehumidification command is generated. According to the dehumidification command, the blower is first controlled to run in the forward direction, and the forward check valve is opened at the same time. The operating intensity is adjusted according to the proportion of moisture content exceeding the limit: η = (dd s ) / d s Where η is the excess ratio, d is the current moisture content, and d s To preset a safe moisture content, when η is less than or equal to 0, the blower operates at a low frequency or is shut down; when η is greater than 0 but less than or equal to 0.5, the blower operates at a medium frequency; when η > 0.5, the blower operates at a high frequency, sending outside air into the air chamber after deep drying by the dehumidifier. Simultaneously, the opening of the electromagnetic proportional valve is adjusted in real time by a pressure detection device to discharge humid gas and ensure the pressure inside the air chamber remains positive. As the gas is continuously replaced, changes in moisture content are continuously monitored. When the moisture content drops to a safe threshold, the operating frequency of the blower is gradually reduced. At the same time, the pressure detection device continuously monitors the pressure inside the air chamber and adjusts the opening degree of the electromagnetic proportional valve based on the pressure value to match the output air volume with the current intake air volume, maintaining stable positive pressure inside the air chamber. The exhaust flow rate of the electromagnetic proportional valve is greater than the supply air flow rate of the blower at its maximum operating frequency, thus ensuring effective maintenance of the positive pressure in the air chamber.

[0086] In actual operation, the internal temperature of the gas chamber may rise rapidly due to sudden changes in the external environment or a sudden increase in the load on internal equipment. To avoid localized overheating affecting insulation performance, the rate of temperature rise per unit time can be calculated based on temperature data continuously collected by temperature and humidity sensors; the formula for calculating the rate of temperature rise is: V T = (T k -T k-1 ) / ∆t, where V T T represents the rate of temperature rise. k and T k-1The temperature values ​​are for two sampling periods, and ∆t is the sampling interval. When the temperature rise rate exceeds the preset temperature rise rate threshold, or the current temperature is higher than the preset warning temperature, an overheating risk is identified. At this time, based on the overheating risk level, the blower is controlled to run in the forward direction, and the forward check valve is opened. The blower's air supply intensity is adjusted according to the temperature rise rate, sending the dried gas treated by the dehumidifier into the air box. Meanwhile, the opening degree of the electromagnetic proportional valve is controlled by the pressure value fed back in real time by the positive pressure detection device. By adjusting the exhaust flow rate, the pressure value in the air box is ensured to remain stable at a positive pressure value. The continuous inflow and controlled discharge of the dried gas form an orderly replacement, effectively removing heat and achieving the purpose of heat dissipation. When the temperature drops back to a safe range, the operating frequency of the blower is gradually reduced. At the same time, the pressure detection device continuously monitors the pressure value in the air box and adjusts the opening degree of the electromagnetic proportional valve based on the pressure value to match the air output with the current air intake, maintaining a stable positive pressure in the air box.

[0087] Step S102: Obtain the pressure value of the air box through the pressure detection device.

[0088] The pressure detection device installed on the air box collects the internal pressure value of the air box, which is used to determine whether the air box is in a positive pressure state and to provide feedback for adjusting the opening degree of the electromagnetic proportional valve.

[0089] Step S103: Calculate the actual density of the gas in the gas box based on the pressure value, moisture content, and temperature.

[0090] Actual density refers to the true density of air inside the gas chamber under the current pressure, temperature, and moisture content conditions. The formula for calculating actual density is: ρ=[P / (R∙T)][1 / (1+d / 1000∙1.6087)], where ρ is the actual density, P is the pressure value, R is the gas constant of dry air, T is the temperature, d is the moisture content, and 1.6078 is a constant determined by the physical properties of the gas, derived from the ratio of the gas constant of water vapor to that of dry air.

[0091] Step S104: Based on the actual density, calculate the theoretical pressure difference range corresponding to the operating frequency of the blower.

[0092] The operating frequency refers to the speed control signal of the blower, which is generated by the temperature and humidity sensor based on the environmental conditions inside the air box, and is used to adjust the air supply intensity.

[0093] The theoretical pressure drop range refers to the normal pressure drop range that the filter components should produce under the conditions of gas density and blower operation. The formula for calculating the theoretical pressure drop range is: ∆P=K∙(ρ / ρ0)∙Q 2 K is the filter cotton resistance coefficient, with a value of 480 Pa / (m). 3 / h) 2ρ represents the actual density, ρ0 represents the nominal density, and Q represents the effective air volume, which is the gas volume flow rate passing through the filter assembly per unit time. For example, when the calculated theoretical pressure difference ∆P is 1630Pa, considering factors such as the manufacturing tolerance of the blower, batch differences in the filter cotton, and sensor measurement errors, a reasonable fluctuation range is determined according to a tolerance band of ±8%, i.e., 1500Pa to 1760Pa.

[0094] Step S105: Obtain the gas pressure difference across the filter assembly using a differential pressure sensor.

[0095] The gas pressure difference refers to the difference in static pressure between the outlet and inlet sides of the filter element. The gas pressure difference is formed by the pressure drop caused by resistance when the airflow passes through the filter cotton, and directly reflects the degree of clogging of the filter cotton.

[0096] Step S106: If the gas pressure difference exceeds the theoretical pressure difference range, generate a filter cotton replacement prompt message.

[0097] Filter replacement reminder information refers to a warning signal or notification sent to maintenance personnel via local indicator lights or remote display screen when the gas pressure difference exceeds the theoretical pressure difference range, prompting them to replace the filter cotton in a timely manner.

[0098] By adopting the above technical solution, the temperature and humidity inside the gas chamber are obtained, the actual gas density is calculated, and the theoretical pressure difference range of the filter components under the current operating conditions is determined in conjunction with the operating frequency of the blower. When the measured pressure difference exceeds this range, a filter replacement reminder is triggered. This solution significantly improves the accuracy of fault diagnosis, reduces human error and ineffective inspections, and provides a reliable foundation for the regulation of temperature and humidity inside the gas chamber and effective dehumidification.

[0099] This application discloses a method for reverse conversion defrosting of a gas box. Referring to Figure 2, the method includes:

[0100] Step S201: Obtain the outlet temperature and operating current of the dehumidifier.

[0101] The outlet temperature refers to the temperature at the air outlet of the dehumidifier. When the evaporator frosts during dehumidifier operation, airflow is obstructed, causing the outlet temperature to rise. The operating current is used to help determine the frost blockage status. The outlet temperature is generally obtained through a temperature sensor.

[0102] Operating current refers to the current flowing through the power supply circuit when the dehumidifier is running, and it reflects the load status of the dehumidifier. The operating current is obtained through a current sensor installed in the dehumidifier's power supply circuit.

[0103] Step S202: When the outlet temperature is higher than the temperature threshold and the operating current is higher than the current threshold, a frost blockage signal is generated.

[0104] The frost blockage signal is an abnormal status indication signal generated by the dehumidifier due to increased airflow resistance and obstructed airflow caused by frost formation on the evaporator.

[0105] By determining that the dehumidifier outlet temperature is higher than the temperature threshold and the operating current is higher than the current threshold, the system identifies temperature and load abnormalities caused by airflow obstruction due to evaporator frost, thereby generating a frost blockage signal.

[0106] Step S203: Based on the frost blockage signal, block the filter replacement prompt and start the dehumidifier defrosting program.

[0107] The filter replacement reminder is to prevent the increased pressure due to airflow obstruction when the dehumidifier is frosted and clogged from being mistaken for a clogged filter. This avoids unnecessary warnings and ensures that the reminder is only given when the filter is actually clogged.

[0108] Initiating the dehumidifier defrosting program involves controlling the blower to run in reverse for a preset time. This reverse airflow blows across the surface of the dehumidifier evaporator, promoting the melting or removal of frost and restoring ventilation. The preset time ensures effective defrosting while preventing prolonged reverse operation from affecting normal ventilation or causing other abnormalities. When the blower reverses, the forward check valve is closed to prevent gas in the air chamber from flowing back to the outside through the blower, ensuring the air chamber maintains a positive pressure. Simultaneously, the reverse check valve is opened, allowing outside air to enter the blower and flow in reverse through the filter components and dehumidifier, achieving back-blowing defrosting. This process does not disrupt the positive pressure environment inside the air chamber.

[0109] Step S204: After starting the dehumidifier defrost program, reassess the dehumidification status of the dehumidifier.

[0110] The dehumidification status refers to whether the dehumidifier is currently in normal operation, frost blockage, or defrost. This is determined by re-detecting the dehumidifier's outlet temperature and operating current and comparing them with preset thresholds to decide whether to continue defrosting or resume the forward operation of the blower.

[0111] Step S205: If the dehumidification status is frost blockage, repeat the above two steps.

[0112] If the frost blockage is confirmed to be unresolved, repeat the shielded filter warning and reverse the blower operation to gradually eliminate stubborn frost through a cycle, preventing the malfunction from persisting due to insufficient defrosting in a single operation. For example, if after 60 seconds of reverse operation, the dehumidifier is still determined to be frost-blocked based on the outlet temperature and current, then repeat the reverse operation for another 60 seconds.

[0113] After reassessing based on the outlet temperature and operating current, if the dehumidifier still meets the frost blockage conditions, the shielding filter replacement prompt message will be executed again, and the blower will be controlled to run in reverse for a preset time. The defrosting process will be repeated until the frost blockage is resolved, thus avoiding the continued failure due to insufficient defrosting in a single operation. For example, if the outlet temperature and operating current are still higher than their respective thresholds after the blower has run in reverse for 60 seconds, the reverse operation will be executed again for another 60 seconds.

[0114] Step S206: If the dehumidification mode is defrosting, then remove the shielding of the filter cotton replacement prompt information and control the blower to run in the forward direction.

[0115] After confirming that the dehumidifier frost has been removed and ventilation has been restored, the filter clogging monitoring function is reactivated and the blower is put back into forward operation to ensure accurate response to actual filter clogging faults. For example, after the blower finishes reversing operation, if the measured air outlet temperature and operating current meet the defrosting conditions, the blower is switched back into forward operation, and the filter clogging monitoring function is reactivated.

[0116] By adopting the above technical solution, the outlet temperature and operating current of the dehumidifier are monitored, and the frost blockage status is identified by combining preset thresholds, thus blocking any false filter replacement prompts caused by this. Simultaneously, the blower is controlled to run in reverse to promote defrosting, and after defrosting is confirmed, it resumes forward operation and normal diagnostic functions. This solution significantly improves the accuracy of fault diagnosis, reduces false alarms and ineffective maintenance caused by frost blockage, and ensures that the dehumidifier promptly restores its normal dehumidification capacity after defrosting.

[0117] This application discloses a method for identifying hard clogging of filter cotton. Referring to Figure 3, the method includes:

[0118] Step S301: After starting the dehumidifier defrosting program, within the first preset time after the blower reverses operation, obtain the first reverse pressure difference value on both sides of the filter component.

[0119] The first preset time refers to the short window used to collect the initial pressure difference after the blower is reversed and started, which is usually set to 5 seconds.

[0120] The first reverse pressure difference value refers to the pressure difference between the side of the filter component near the inside of the air box and the side near the air inlet, measured at the first preset time. This pressure difference value is only used for fault diagnosis of hard blockage and is not used as a basis for adjusting the operating frequency or start / stop status of the blower. The control operation performed based on this pressure difference value is a safety protection mechanism triggered when defrosting is abnormal. Its triggering conditions and execution logic are different from the control of the blower under normal operating conditions driven by temperature and humidity sensor signals.

[0121] Step S302: Determine whether the first reverse pressure differential value exceeds the blockage threshold.

[0122] The purpose of this judgment is to initially screen whether the resistance is abnormally high during the reverse operation state, so as to determine whether it is necessary to obtain a second reverse pressure difference value, and to avoid misjudgment caused by airflow disturbance at the moment of the blower's reverse start-up.

[0123] Step S303: If yes, control the blower to continue running in reverse, and within the second preset time after startup, obtain the second reverse pressure difference value on both sides of the filter component.

[0124] The second preset time refers to a stable operating period after the blower starts in reverse, usually 20 to 30 seconds, to avoid transient fluctuations and obtain a more representative second reverse pressure difference value when the airflow is relatively stable in order to confirm the blockage trend.

[0125] The second reverse pressure difference value refers to the pressure difference across the filter component measured when the blower reverses to the second preset time. It is used to compare with the blockage threshold to determine whether the resistance decreases with reverse operation. It is also used to confirm the trend of the first reverse pressure difference value and eliminate instantaneous interference.

[0126] Step S304: If the second reverse pressure differential value exceeds the blockage threshold, control the blower to switch to forward operation, so that the blower operates at the highest working frequency, and obtain the positive pressure differential value within the third preset time after startup.

[0127] The third preset time refers to the period after the blower switches to forward operation and operates at the highest working frequency, during which the airflow is allowed to stabilize and a reliable differential pressure value is collected. This period is usually 5 to 10 seconds, ensuring that the obtained positive differential pressure value can truly reflect the resistance status of the current filter components.

[0128] The forward pressure difference value refers to the pressure difference across the filter component measured when the blower resumes forward operation and runs stably at the highest operating frequency. It is used to verify whether the resistance is indeed outside the normal range under the maximum airflow condition.

[0129] Operating at the highest frequency is intended to fully expose the true resistance of the filter components under maximum airflow, making the differential pressure response most significant, thereby providing a clear basis for judging whether the theoretical differential pressure range has been exceeded.

[0130] Switching the blower to forward operation is to restore the normal ventilation direction and to perform final verification of the filter component resistance under standard operating conditions.

[0131] Step S305: If the positive pressure difference value exceeds the high-frequency theoretical pressure difference range corresponding to the blower at its highest operating frequency, it is determined that the filter component has become hard blocked.

[0132] Hard blockage refers to an irreversible increase in resistance caused by long-term dust accumulation or foreign object embedding in the filter cotton. Even if the blower is reversed to blow it clean, it cannot be restored. The filter cotton must be replaced to restore normal ventilation.

[0133] The positive pressure difference at the highest operating frequency still significantly exceeded the theoretical pressure difference range of high frequency, indicating that the resistance was still abnormal even under the maximum air volume condition. The influence of insufficient air volume or instantaneous disturbance was ruled out, confirming that the filter cotton was irreversibly blocked.

[0134] Step S306: Based on hard blockage, terminate the frost blockage operation, remove the shielding of the filter cotton replacement prompt information, and generate the filter cotton replacement prompt information.

[0135] Once a hard blockage is confirmed in the filter cotton, the frost-clogging operation is stopped, the filter cotton replacement prompt message is restored, and a replacement reminder is issued to ensure that maintenance personnel address genuine blockage faults promptly. The frost-clogging operation can be performed according to steps S202-S206.

[0136] By adopting the above technical solution, instantaneous and trend pressure difference values ​​are acquired in stages during the reverse phase of the blower. Combined with pressure difference verification under high airflow conditions during forward rotation, the system can distinguish between frost blockage and hard blockage of the filter cotton. Upon confirmation of hard blockage, the defrosting process is terminated and a filter cotton replacement prompt is triggered. This solution significantly improves the accuracy of fault identification, reduces ineffective operation and delayed processing due to misjudgment, and ensures that the filter components are repaired promptly when truly blocked, providing a smooth airflow path for subsequent ventilation and dehumidification processes.

[0137] This application discloses a method for diagnosing filter clogging based on effective airflow. Referring to Figure 4, the method includes:

[0138] Step S401: Obtain the actual operating current and actual rotation speed of the blower.

[0139] The actual operating current refers to the real-time current value flowing through the power supply circuit when the blower is in operation, which is obtained directly through the current detection circuit.

[0140] The actual rotational speed refers to the real rotational speed of the blower during operation, which is obtained by the back electromotive force detection circuit.

[0141] Step S402: Compare the actual operating current with the factory-calibrated operating current and calculate the current deviation rate.

[0142] The factory-rated operating current refers to the reference current value measured by the blower under standard test conditions, at a specific operating frequency and in a standard air density environment before it leaves the factory.

[0143] Current deviation rate refers to the relative deviation between the actual operating current and the factory-rated operating current, usually expressed as a percentage. The formula is: I = [(I实 -I 标 ) / I 标 ]×100%, where I is the current deviation rate, I 实 I is the actual operating current. 标 This is the factory-calibrated operating current.

[0144] Comparing the actual operating current with the factory-calibrated operating current is to determine whether the blower's operating status deviates from the normal range due to aging, voltage fluctuations, or changes in mechanical resistance, thus providing a basis for subsequent effective airflow correction.

[0145] Step S403: Compare the actual speed with the factory-calibrated speed and calculate the speed deviation rate.

[0146] The factory-calibrated speed refers to the reference speed value measured by the blower under standard test conditions, in a specific operating frequency and standard air density environment before it leaves the factory.

[0147] Speed ​​deviation rate refers to the relative deviation between the actual speed and the factory-calibrated speed, expressed as a percentage. The formula is: V=[(V 实 -V 标 ) / V 标 ]×100%, where V is the speed deviation rate, V 实 V represents the actual rotational speed. 标 This is the factory-calibrated speed.

[0148] Comparing the actual speed with the factory-calibrated speed is to determine whether the speed of the blower deviates from the normal range due to abnormal power supply, mechanical wear, or load changes, thereby affecting the accuracy of the effective air volume output.

[0149] Step S404: If the current deviation rate exceeds the current tolerance threshold or the speed deviation rate exceeds the speed tolerance threshold, the effective air volume is obtained based on the actual operating current and the actual speed.

[0150] Effective air volume refers to the actual volumetric flow rate of gas output by the blower under actual speed and operating current conditions, reflecting its true ventilation capacity. (Q) 有 =Q 标 ×(V 实 / V 标 )×f(I 实 / I 标 ), where Q 标 The reference air volume is measured under factory calibration conditions. f(∙) is an empirical correction function, obtained by looking up a table. It is used to reflect the air volume reduction caused by load changes, and its value is usually less than or equal to 1.

[0151] If either the current deviation rate or the speed deviation rate exceeds the corresponding tolerance threshold, it means that the actual operating state of the blower has deviated from the factory calibration conditions. If the reference air volume is continued to be used, the differential pressure judgment will be inaccurate.

[0152] Step S405: Based on the effective air volume and actual density, recalculate the actual theoretical pressure difference range corresponding to the blower at the highest operating frequency.

[0153] The actual theoretical pressure difference range refers to the reasonable range of pressure difference that the filter component of the blower should have at its highest operating frequency, calculated by combining the effective air volume and the actual density of the gas using the formula for the theoretical pressure difference range in step S103.

[0154] By adopting the above technical solution, the actual operating current and speed of the blower are obtained, and the performance status of the blower is evaluated in conjunction with the factory calibration parameters. When deviations exceed limits, the effective air volume and theoretical pressure difference range are corrected. Simultaneously, blockage judgment is performed based on the corrected pressure difference benchmark. This solution significantly improves the accuracy of filter clogging diagnosis, reduces false alarms and missed alarms caused by blower aging or changes in operating conditions, and avoids insufficient ventilation or dehumidification interruption due to misjudgment of airflow conditions, thereby ensuring the reliability of temperature and humidity control inside the air chamber.

[0155] This application discloses an early warning method for filter cotton clogging. Referring to Figure 5, the method includes:

[0156] Step S501: Collect the gas pressure difference on both sides of the filter component and the theoretical pressure difference range corresponding to the gas pressure difference to form time series data.

[0157] Time series data refers to a data sequence consisting of gas pressure difference values ​​and the corresponding theoretical pressure difference ranges recorded sequentially at a fixed sampling period, used to reflect the changing trend of pressure difference over time.

[0158] Step S502: Based on time series data, calculate the relative deviation of the gas pressure difference value relative to the theoretical pressure difference range.

[0159] Relative deviation refers to the degree to which the gas pressure difference deviates from the theoretical pressure difference range. If the gas pressure difference exceeds the theoretical pressure difference range, the percentage of the excess value relative to the theoretical pressure difference range is calculated; if it does not exceed the range, the relative deviation is zero or considered normal. For example, if the theoretical pressure difference range is calculated to be 1400 Pa - 1680 Pa, and the gas pressure difference is 1764 Pa, then the relative deviation is (1764 - 1680) / 1680 × 100% = 5.0%.

[0160] Step S503: Calculate the rate of change of the relative deviation over N consecutive sampling periods, where N is an integer greater than 1.

[0161] The rate of change refers to the rate at which the relative deviation increases over time. It is usually taken as N=3 to 5 periods and is expressed as the slope of a linear regression or the average difference between adjacent periods. For example, if the relative deviations of the most recent 3 periods are 2.1%, 3.5%, and 4.9%, then the rate of change is approximately (4.9%−2.1%) / 2≈1.4%.

[0162] Step S504: If the rate of change exceeds the preset rate of change threshold, obtain the operating current of the blower.

[0163] The purpose of obtaining the working current of the blower when the rate of change exceeds the rate of change threshold is to determine whether the effective air volume increases synchronously in conjunction with the current working frequency, thereby distinguishing whether the pressure difference rise is due to filter blockage or changes in the output of the blower.

[0164] Step S505: Execute the first judgment step, which includes combining the operating current and operating frequency to determine whether the effective air volume increases synchronously.

[0165] Determining whether the effective air volume increases synchronously is to distinguish whether the increase in gas pressure difference is due to the increased output of the blower or an abnormal increase in the resistance of the filter cotton itself.

[0166] Step S506: If yes, then it is determined to be an environmental parameter disturbance, and the theoretical pressure difference range is recalculated.

[0167] If the effective air volume increases synchronously, it is determined that the increase in the gas pressure difference across the filter assembly is caused by changes in environmental parameters. In this case, the theoretical pressure difference range is recalculated based on the current operating frequency of the blower and the actual gas density. The calculation method for the theoretical pressure difference range is the same as that in step S104.

[0168] Step S507: If not, generate an early warning message about accelerated degradation of the filter cotton.

[0169] If the effective air volume does not increase synchronously, it indicates that the increase in the gas pressure difference on both sides of the filter component is not caused by changes in environmental parameters, but by an abnormal increase in the resistance of the filter cotton. At this time, an early warning message of accelerated filter cotton degradation is generated to remind maintenance personnel to check or replace the filter cotton in time.

[0170] By employing the above technical solution, a time series of pressure differentials and their theoretical ranges for the filter components is collected. This time series is then used to identify the deterioration trend of the filter cotton performance, combined with the relative deviation change rate. The operating current and frequency of the blower are also linked to verify the airflow response. If the airflow does not increase synchronously, it is determined to be an environmental disturbance, and the theoretical pressure differential range is updated. If the airflow synchronization is abnormal, an early warning of accelerated filter cotton degradation is issued. This solution significantly improves the accuracy of early blockage identification, reduces false alarms caused by environmental fluctuations and missed detections of actual faults, and avoids a slow decline in ventilation capacity due to the hidden deterioration of the filter cotton. This ensures the airflow replacement efficiency within the air chamber and maintains the effectiveness of dehumidification and heat dissipation functions.

[0171] This application discloses a method for steady-state monitoring of a blower device. Referring to Figure 6, the method includes:

[0172] Step S601: Obtain the operating frequency of the continuous sampling points of the blower.

[0173] Continuous sampling points refer to the operating frequency data of the blower collected at fixed time intervals, which are used to reflect the change process of the blower's operating status over time.

[0174] The purpose of obtaining the operating frequency of continuous sampling points is to monitor whether the operating status of the blower is becoming stable.

[0175] Step S602: Based on the operating frequency, calculate the frequency change between adjacent consecutive sampling points to obtain the frequency change sequence.

[0176] Frequency change refers to the difference in the operating frequency of the blower at two adjacent sampling times, which indicates whether the operating status of the blower is being dynamically adjusted.

[0177] A frequency variation sequence is an array composed of the operating frequency differences between adjacent sampling points, used to comprehensively evaluate whether the blower has stopped speed regulation and tended to stabilize operation over a period of time. For example, if the operating frequencies of four consecutive sampling points are 48.0Hz, 49.2Hz, 49.8Hz, and 50.0Hz, then the absolute values ​​of the adjacent differences are 1.2Hz, 0.6Hz, and 0.2Hz, respectively, resulting in a frequency variation sequence of [1.2, 0.6, 0.2].

[0178] Step S603: Perform the second judgment step, which includes judging whether the absolute value of each frequency change in the frequency change sequence is lower than the stable threshold.

[0179] The absolute value of each change in the frequency change sequence is lower than the stable threshold. This is to ensure that the blower has entered steady-state operation and to avoid interference from air volume fluctuations during speed regulation, which could affect the accurate judgment of the relationship between the effective air volume and the gas pressure difference.

[0180] Step S604: If not, pause the execution of the first judgment step and repeat the above three steps.

[0181] The judgment step is paused before the blower device is stable, and the frequency is re-acquired and the change sequence is updated to prevent misjudgment caused by data interference during the dynamic speed adjustment stage. The judgment step refers to the first judgment step.

[0182] Step S605: If yes, then the blower is determined to have entered the steady-state operation stage, and the first judgment step is executed.

[0183] After confirming that the operating frequency of the blower is stable, it is determined that it has entered the steady-state operation stage, and the logic of the first judgment step can be carried out to ensure that the analysis of the relationship between the gas pressure difference and the effective air volume is not disturbed by the speed adjustment process of the blower.

[0184] By adopting the above technical solution, the operating frequency of the blower is obtained from continuous sampling points, the frequency change is calculated, and the stability of the blower's operating frequency is determined. The differential pressure and current correlation diagnosis is only performed after the blower has entered steady-state operation. The judgment is delayed during frequency fluctuations to avoid interference from unsteady-state data during frequency conversion transitions. This solution significantly improves the accuracy of blockage diagnosis and reduces false alarms caused by blower speed adjustments.

[0185] This application discloses a method for inflating an air box based on the state of the filter cotton. Referring to Figure 7, the method includes:

[0186] Step S701: Obtain the pressure value of the air box through the pressure detection device.

[0187] The pressure value refers to the internal pressure of the air box measured by the pressure detection device, which is used to determine whether the air box is under positive pressure.

[0188] Step S702: When the pressure value is lower than the positive pressure value but higher than the critical value, decide whether to perform an air filling operation on the air box based on the judgment result of whether a filter cotton replacement prompt message is generated.

[0189] If the pressure value is lower than the positive pressure value but higher than the critical value, it means that although the pressure inside the air box is lower than the positive pressure value, it has not yet dropped to the critical value and there is still a safety margin. It is permissible to first determine whether the filter cotton is blocked before the air box is filled. If the filter cotton is blocked, even if it is filled, it will be difficult to enter the air box effectively, and it may cause the blower to overload.

[0190] When the temperature and humidity are within the normal range, if the air box pressure is detected to be lower than the positive pressure value but higher than the critical value, and the filter cotton is in normal condition, the blower will operate at the preset minimum frequency to send dehumidified and filtered external air into the air box to restore the positive pressure. The inflation operation is triggered by the pressure state, but the operating parameters of the blower adopt a fixed strategy and are not adjusted based on the pressure signal. The pressure value does not participate in the adjustment of the operating parameters of the blower, and its closed-loop control only acts on the electromagnetic proportional valve.

[0191] The inflation operation refers to starting the blower and rotating it in the forward direction, so that the outside air is sent into the air box after being deeply dried by the dehumidifier and purified by the filter components. At the same time, the opening degree of the electromagnetic proportional valve is adjusted according to the pressure value inside the air box to maintain the positive pressure value inside the air box.

[0192] Step S703: If the judgment result is to generate a filter cotton replacement prompt message, then the inflation operation is prohibited, and the filter cotton is prompted to be replaced first.

[0193] When it is confirmed that the filter cotton is clogged and needs to be replaced, do not perform air inflation to avoid ineffective air replenishment, and remind the operator to address the filter cotton problem first.

[0194] Step S704: If the judgment result is that no filter cotton replacement prompt message is generated, start the inflation operation until the air box reaches the positive pressure value.

[0195] If the filter cotton is confirmed to be unblocked and the ventilation is normal, the air box may be inflated to raise the pressure inside the air box to a positive pressure value.

[0196] By adopting the above technical solution, the positive pressure detection device obtains the pressure value of the air chamber and, combined with the judgment result of the filter cotton replacement prompt information, determines the inflation strategy: if it is confirmed that the filter cotton is not blocked, it initiates air replenishment to restore a slight positive pressure; if it is determined that the filter cotton is blocked, it prohibits inflation and prioritizes prompting the replacement of the filter cotton. This solution significantly improves the accuracy of air chamber pressure control, ensuring that the air chamber positive pressure value is always maintained. If the pressure value drops to the critical value, inflation must be performed regardless of the filter cotton condition to prevent irreversible damage to the air chamber.

[0197] Based on the same inventive concept, embodiments of this application provide a control system for a gas box, including:

[0198] The acquisition module 801 is used to acquire temperature, humidity and gas pressure difference values;

[0199] The memory 802 is used to store the program for the control method of the air box;

[0200] The processor 803 can load and execute programs in memory to implement the control method of the air box.

[0201] By adopting the above technical solution, the module acquires temperature, humidity and differential pressure data of the air box and filter components. The processor quickly executes logic such as blockage identification, frost blockage judgment and positive pressure linkage control. The complete environmental control program is solidified in the memory and runs reliably. It realizes the whole process from state perception to maintenance decision-making, which significantly improves the operation and maintenance response efficiency while ensuring the accuracy of fault diagnosis, and provides an efficient and reliable solution for intelligent operation and maintenance of power equipment.

[0202] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0203] This application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed to control a gas box.

[0204] Computer storage media include, for example, USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media that can store program code.

[0205] Based on the same inventive concept, embodiments of this application provide a smart terminal, including a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and execute a control method for an air box.

[0206] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0207] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A method for controlling a gas box, characterized in that, An air inlet is located at the bottom of the air box, and an air outlet is located at the top. A dehumidifier, a filter assembly, a blower, a reverse check valve, and a forward check valve are sequentially arranged at the air inlet. The forward check valve is located at the interface between the air inlet and the air box. The reverse check valve is located on the bypass branch between the blower and the forward check valve. A differential pressure sensor is installed between the inlet and outlet sides of the filter assembly. An electromagnetic proportional valve is installed at the air outlet; The gas chamber is equipped with temperature and humidity sensors and a pressure detection device. This includes: acquiring the temperature and humidity inside the gas chamber using the temperature and humidity sensors, and calculating the moisture content based on these values; acquiring the pressure value of the gas chamber using the pressure detection device; calculating the actual density of the gas inside the gas chamber based on the pressure value, moisture content, and temperature; calculating the theoretical pressure difference range corresponding to the operating frequency of the blower based on the actual density; acquiring the gas pressure difference across the filter assembly using a differential pressure sensor; generating a filter replacement reminder when the gas pressure difference exceeds the theoretical pressure difference range; and collecting the gas pressure difference across the filter assembly and the gas... The theoretical pressure difference range corresponding to the gas pressure difference is used to form time series data. Based on the time series data, the relative deviation of the gas pressure difference relative to the theoretical pressure difference range is calculated. The rate of change of the relative deviation over N consecutive sampling periods is calculated, where N is an integer greater than 1. If the rate of change exceeds a preset rate of change threshold, the operating current of the blower is obtained. The first judgment step is executed, which includes combining the operating current and operating frequency to determine whether the effective air volume increases synchronously. If so, it is determined to be an environmental parameter disturbance, and the theoretical pressure difference range is recalculated. If not, an early warning information of accelerated filter cotton degradation is generated.

2. The method for controlling a gas box according to claim 1, characterized in that, The method further includes: acquiring the outlet temperature and operating current of the dehumidifier; generating a frost blockage signal when the outlet temperature is higher than a temperature threshold and the operating current is higher than a current threshold; based on the frost blockage signal, blocking the filter replacement prompt information and starting the dehumidifier defrosting program; after starting the dehumidifier defrosting program, re-evaluating the dehumidification status of the dehumidifier; if the dehumidification status is frost blockage, repeatedly blocking the filter replacement prompt information and starting the dehumidifier defrosting program; if the dehumidification status is defrosting, removing the blocking of the filter replacement prompt information and controlling the blower to run in the forward direction.

3. The method for controlling a gas box according to claim 2, characterized in that, The method further includes: after starting the dehumidifier defrosting program, within a first preset time after the blower device reverses operation, acquiring the first reverse pressure difference value on both sides of the filter component; determining whether the first reverse pressure difference value exceeds the clogging threshold; if so, controlling the blower device to continue reversing operation, and acquiring the second reverse pressure difference value on both sides of the filter component within a second preset time after startup; if the second reverse pressure difference value exceeds the clogging threshold, controlling the blower device to switch to forward operation, making the blower device operate at the highest working frequency, and acquiring the forward pressure difference value within a third preset time after startup; if the forward pressure difference value exceeds the high-frequency theoretical pressure difference range corresponding to the blower device at the highest working frequency, determining that the filter component has hard clogging; based on the hard clogging, terminating the defrosting operation, removing the shielding of the filter cotton replacement prompt information, and generating the filter cotton replacement prompt information.

4. The method for controlling a gas box according to claim 3, characterized in that, After the blower is switched to forward operation and runs at its highest operating frequency, the following steps are also included: acquiring the actual operating current and actual rotational speed of the blower; comparing the actual operating current with the factory-calibrated operating current to calculate the current deviation rate; comparing the actual rotational speed with the factory-calibrated rotational speed to calculate the rotational speed deviation rate; if the current deviation rate exceeds the current tolerance threshold or the rotational speed deviation rate exceeds the rotational speed tolerance threshold, then obtaining the effective air volume based on the actual operating current and actual rotational speed; and recalculating the actual theoretical pressure difference range corresponding to the blower at its highest operating frequency based on the effective air volume and actual density.

5. The method for controlling a gas box according to claim 1, characterized in that, Before determining whether the effective air volume increases synchronously when the rate of change exceeds a preset rate of change threshold, the method further includes: acquiring the operating frequency of continuous sampling points of the blower; calculating the frequency change between adjacent continuous sampling points based on the operating frequency to obtain a frequency change sequence; executing a second judgment step, which includes determining whether the absolute value of each frequency change in the frequency change sequence is lower than a stable threshold; if not, pausing the execution of the first judgment step and repeating the above three steps; if yes, determining that the blower has entered a steady-state operation stage and executing the first judgment step.

6. The method for controlling a gas box according to claim 1, characterized in that, The method further includes: obtaining the pressure value of the air box through a pressure detection device; when the pressure value is lower than the positive pressure value but higher than the critical value, deciding whether to perform an inflation operation on the air box based on the judgment result of whether a filter cotton replacement prompt message is generated; if the judgment result is that a filter cotton replacement prompt message is generated, the inflation operation is prohibited, and the filter cotton is prompted to be replaced first; if the judgment result is that no filter cotton replacement prompt message is generated, the inflation operation is started until the air box reaches the positive pressure value.

7. A control system for a gas box, characterized in that, The system is used to execute the control method of the gas box as described in any one of claims 1 to 6, comprising: an acquisition module for acquiring temperature, humidity and gas pressure difference values; a memory for storing a program of the control method of the gas box; and a processor, wherein the program in the memory can be loaded and executed by the processor to implement the control method of the gas box.

8. A smart terminal, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer program is stored that can be loaded by a processor and executed as described in any one of claims 1 to 6.

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