Fresh air handling unit, control method and control device for fresh air handling unit

Abstract

The application relates to the technical field of intelligent household electrical appliances, and discloses a fresh air handling unit, a control method and a control device for the fresh air handling unit. The fresh air handling unit comprises a fresh air host, a first self-cleaning module arranged in a fresh air pipeline connected with the fresh air host, the first self-cleaning module comprising a first air door and a second air door, a second self-cleaning module arranged in an exhaust air pipeline connected with the fresh air host, the second self-cleaning module comprising a third air door and a fourth air door, the first air door and the third air door being communicated through the pipeline, and a control device electrically connected with the fresh air host, the first air door, the second air door, the third air door and the fourth air door. The control device is used for controlling the opening and closing states of the first air door, the second air door, the third air door and the fourth air door, switching the flow paths of air flow in the fresh air pipeline and the exhaust air pipeline, and enabling the fresh air handling unit to execute a self-cleaning mode. The application can reduce the cleaning difficulty of the fresh air handling unit pipeline and improve the cleaning efficiency.

Description

Technical Field

[0001] This application relates to the field of smart home appliance technology, such as a fresh air handling unit, a control method for the fresh air handling unit, and a control device. Background Technology

[0002] Currently, fresh air systems, central air conditioning, and air purification equipment are widely used. Fresh air units work by supplying fresh air into the room through ductwork and exhausting stale air through exhaust ductwork. However, during long-term operation, the ducts inevitably accumulate large amounts of dust, lint, microorganisms (such as mold and bacteria), and even insect carcasses. These pollutants reduce the quality of indoor air, harm human health, increase air resistance, and lead to higher energy consumption for the fresh air system.

[0003] In related technologies, when cleaning the ducts of a fresh air handling unit, it is necessary to use external special tools to enter the ducts or to disassemble the ducts before cleaning.

[0004] In the process of implementing the embodiments of this disclosure, it was found that the related technology has at least the following technical problems: When using related technologies to clean the ducts of fresh air handling units, the units need to be shut down for extended periods, resulting in low cleaning efficiency and high cleaning difficulty.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a fresh air handling unit, a control method for the fresh air handling unit, and a control device, which can reduce the cleaning difficulty and improve the cleaning efficiency when cleaning the ducts of the fresh air handling unit.

[0008] In some embodiments, a fresh air handling unit includes: a fresh air host; a first self-cleaning module disposed in a fresh air duct connected to the fresh air host, the first self-cleaning module including a first damper and a second damper; a second self-cleaning module disposed in an exhaust duct connected to the fresh air host, the second self-cleaning module including a third damper and a fourth damper; the first damper and the third damper being connected through a duct; a control device electrically connected to the fresh air host, the first damper, the second damper, the third damper and the fourth damper; the control device is used to control the opening and closing states of the first damper, the second damper, the third damper and the fourth damper, switch the airflow path in the fresh air duct and the exhaust duct, and enable the fresh air handling unit to perform a self-cleaning mode.

[0009] Optionally, the self-cleaning mode includes a first cleaning mode and a second cleaning mode; when the first cleaning mode is executed, the control device is used to control the opening of the first air damper, the second air damper and the third air damper, and to control the closing of the fourth air damper; when the second cleaning mode is executed, the control device is used to control the closing of the first air damper and the third air damper, and to control the opening of the second air damper and the fourth air damper.

[0010] Optionally, the first self-cleaning module further includes: a first filter screen disposed at the first air damper and the second air damper; the second self-cleaning module further includes: a second filter screen disposed at the third air damper and the fourth air damper.

[0011] Optionally, the fresh air handling unit further includes: a timer for recording the cumulative operating time since the last execution of the self-cleaning mode; a differential pressure sensor installed in the fresh air duct and the exhaust air duct for detecting differential pressure changes within the duct; a PM2.5 sensor installed in the fresh air unit for detecting indoor particulate matter concentration; and a control device electrically connected to the timer, the differential pressure sensor, and the PM2.5 sensor, the control device determining whether to execute the self-cleaning mode based on at least one of the cumulative operating time, differential pressure changes, and particulate matter concentration.

[0012] In some embodiments, the control method for a fresh air handling unit is applied to the fresh air handling unit as described above. The control method includes: acquiring the status monitoring parameters of the fresh air handling unit operation; determining the target cleaning mode to be executed based on the self-cleaning trigger conditions satisfied by the status monitoring parameters; and controlling the opening and closing states of the dampers of the first self-cleaning module and the second self-cleaning module according to the control strategy corresponding to the target self-cleaning mode.

[0013] Optionally, the status monitoring parameters include the cumulative running time of the fresh air unit since the last execution of the self-cleaning mode, the pressure difference change data in the duct, and the indoor particulate matter concentration; the self-cleaning modes include a first cleaning mode and a second cleaning mode; based on the self-cleaning trigger conditions satisfied by the status monitoring parameters, the target cleaning mode to be executed is determined, including: if the cumulative running time is greater than or equal to a time threshold, the first cleaning mode and the second cleaning mode are jointly determined as the target cleaning mode; if the cumulative running time is less than a time threshold and the particulate matter concentration is greater than or equal to a first concentration threshold, the first cleaning mode and the second cleaning mode are jointly determined as the target cleaning mode; if the cumulative running time is less than a time threshold and the particulate matter concentration is greater than or equal to a second concentration threshold and less than a first concentration threshold, the target cleaning mode is determined based on the pressure difference change data.

[0014] Optionally, the differential pressure change data includes a first differential pressure ratio of the fresh air duct and a second differential pressure ratio of the exhaust air duct. When the cumulative operating time is less than a duration threshold and the particulate matter concentration is greater than or equal to a second concentration threshold and less than a first concentration threshold, the target cleaning mode is determined based on the differential pressure change data, including: when both the first and second differential pressures are greater than or equal to the first differential pressure threshold, the first and second cleaning modes are jointly determined as the target cleaning mode; when the first differential pressure is greater than or equal to the first differential pressure threshold and the second differential pressure is less than the first differential pressure threshold, the first cleaning mode is determined as the target cleaning mode; when the first differential pressure is less than the first differential pressure threshold and the second differential pressure is greater than or equal to the first differential pressure threshold, the second cleaning mode is determined as the target cleaning mode.

[0015] Optionally, if the target self-cleaning mode includes a first cleaning mode and a second cleaning mode, the first cleaning mode is executed first and lasts for a first set duration, and then the second cleaning mode is switched to and lasts for a second set duration.

[0016] Optionally, after controlling the opening and closing states of the dampers of the first and second self-cleaning modules according to the control strategy corresponding to the target self-cleaning mode, the control method further includes: obtaining the current pressure difference in the duct and / or the current particulate matter concentration in the room; and adjusting the fan speed of the fresh air unit according to the current pressure difference and / or the current particulate matter concentration.

[0017] In some embodiments, a control device for a fresh air handling unit includes a processor and a memory storing program instructions, the processor being configured to execute the control method for the fresh air handling unit as described above when the program instructions are executed.

[0018] The fresh air handling unit, control method, and control device for the fresh air handling unit provided in this disclosure can achieve the following technical effects: In this embodiment, a first self-cleaning module is installed in the fresh air duct of the fresh air handling unit, and a second self-cleaning module is installed in the exhaust duct of the fresh air handling unit. The first self-cleaning module includes a first damper and a second damper, and the second self-cleaning module includes a third damper and a fourth damper. The first damper and the third damper are connected by a duct, and the control device of the fresh air handling unit is electrically connected to the first damper, the second damper, the third damper, and the fourth damper. When it is necessary to clean the duct of the fresh air handling unit, the airflow path in the fresh air duct and the exhaust duct can be switched by controlling the opening and closing states of the first damper, the second damper, the third damper, and the fourth damper. This causes the turbulent airflow formed by the convergence of airflows in the duct to impact the pollutants attached to the inner wall of the duct. In this way, the self-cleaning of the duct is achieved without the need to use external special tools to enter the duct or disassemble the duct, avoiding long-term shutdown of the fresh air handling unit. Therefore, this embodiment can reduce the cleaning difficulty of fresh air handling unit duct cleaning and improve cleaning efficiency.

[0019] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a schematic diagram of a fresh air handling unit provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of an airflow path in a first cleaning mode provided by an embodiment of this disclosure; Figure 3 This is a schematic diagram of the airflow path in a second cleaning mode provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of a first self-cleaning module provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of a second self-cleaning module provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of a control method for a fresh air handling unit provided in an embodiment of this disclosure; Figure 7 This is a schematic diagram of a control device for a fresh air handling unit provided in an embodiment of this disclosure.

[0021] Explanation of reference numerals in the attached figures: 100. Fresh air handling unit; 110. Fresh air main unit; 120. Fresh air duct; 130. First self-cleaning module; 131. First damper; 132. Second damper; 133. First filter; 140. Exhaust duct; 150. Second self-cleaning module; 151. Third damper; 152. Fourth damper; 153. Second filter; 700. Control device for fresh air handling units (control device); 701. Processor; 702. Memory; 703. Communication interface; 704. Bus. Detailed Implementation

[0022] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0023] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0024] Unless otherwise stated, the term "multiple" means two or more features.

[0025] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, the A / B feature means: A or B.

[0026] The term "and / or" describes an association between objects, and the feature indicates that there can be three relationships. For example, A and / or B, the feature indicates three relationships: A or B, or A and B.

[0027] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0029] Combination Figure 1As shown in the figure, this disclosure provides a fresh air handling unit 100, including: a fresh air main unit 110, a first self-cleaning module 130, a second self-cleaning module 150, and a control device 700. The first self-cleaning module 130 is disposed in a fresh air duct 120 connected to the fresh air main unit 110, and includes a first damper 131 and a second damper 132. The second self-cleaning module 150 is disposed in an exhaust duct 140 connected to the fresh air main unit 110, and includes a third damper 151 and a fourth damper 152; the first damper 131 and the third damper 151 are connected by a duct. The control device 700 is electrically connected to the fresh air unit 110, the first damper 131, the second damper 132, the third damper 151, and the fourth damper 152. The control device 700 is used to control the opening and closing states of the first damper 131, the second damper 132, the third damper 151, and the fourth damper 152, switch the airflow path in the fresh air duct 120 and the exhaust air duct 140, and enable the fresh air unit 100 to perform a self-cleaning mode.

[0030] Specifically, the fresh air unit 110 is the core power unit of the entire fresh air system, used to achieve the exchange of indoor and outdoor air. It can introduce fresh outdoor air into the room and expel stale indoor air to the outside, thereby improving indoor air quality.

[0031] Specifically, in self-cleaning mode, the fan of the fresh air unit 110 can provide the necessary airflow for the cleaning process; Specifically, the first self-cleaning module 130 is installed in the fresh air duct 120 connected to the fresh air unit 110, that is, on the duct path where outdoor fresh air enters the room. The first self-cleaning module 130 includes a first damper 131 and a second damper 132. The second damper 132 of the first self-cleaning module 130 is located on the side of the fresh air duct 120 that connects to the fresh air unit 110.

[0032] Specifically, the second self-cleaning module 150 is installed in the exhaust duct 140 connected to the fresh air unit 110, that is, in the duct path from indoor air to the outside. The second self-cleaning module 150 includes a third damper 151 and a fourth damper 152. The fourth damper 152 of the second self-cleaning module 150 is located on the side of the exhaust duct 140 that connects to the outside.

[0033] Specifically, by connecting the first damper 131 of the first self-cleaning module 130 and the third damper 151 of the second self-cleaning module 150 through a pipe, a bypass path connecting the fresh air duct 120 and the exhaust duct 140 can be formed. When the first damper 131 and the third damper 151 are open, the fresh air duct 120 and the exhaust duct 140 achieve airflow interconnection.

[0034] Specifically, the first damper 131, the second damper 132, the third damper 151 and the fourth damper 152 are all controllable valves that can be driven by a stepper motor to achieve opening and closing control.

[0035] Specifically, by electrically connecting the control device 700 to the fresh air unit 110, the first damper 131, the second damper 132, the third damper 151, and the fourth damper 152, when self-cleaning of the fresh air duct 120 and / or the exhaust duct 140 of the fresh air unit 100 is required, the fan of the fresh air unit 110 can be controlled to control the opening and closing states of the first damper 131, the second damper 132, the third damper 151, and the fourth damper 152, thereby switching the airflow path in the fresh air duct 120 and the exhaust duct 140, so that the turbulent airflow formed by the convergence of airflows in the duct impacts the pollutants attached to the inner wall of the duct.

[0036] In this embodiment, a first self-cleaning module 130 is installed in the fresh air duct 120 of the fresh air handling unit 100, and a second self-cleaning module 150 is installed in the exhaust duct 140 of the fresh air handling unit 100. The first self-cleaning module 130 includes a first damper 131 and a second damper 132, and the second self-cleaning module 150 includes a third damper 151 and a fourth damper 152. The first damper 131 and the third damper 151 are connected by a pipe, and the control device 700 of the fresh air handling unit 100 is electrically connected to the first damper 131, the second damper 132, the third damper 151, and the fourth damper 152. When cleaning the ducts of the fresh air handling unit 100 is required, the airflow path between the fresh air duct 120 and the exhaust duct 140 can be switched by controlling the opening and closing states of the first damper 131, the second damper 132, the third damper 151, and the fourth damper 152. This causes the turbulent airflow formed by the convergence of airflows within the ducts to impact the pollutants adhering to the inner wall of the ducts. In this way, self-cleaning of the ducts is achieved without the need for external special tools to enter or disassemble the ducts, avoiding prolonged downtime of the fresh air handling unit 100. Therefore, the embodiments of this disclosure can reduce the cleaning difficulty and improve the cleaning efficiency of the fresh air handling unit 100 ducts.

[0037] In some embodiments, the self-cleaning mode includes a first cleaning mode and a second cleaning mode; when the first cleaning mode is executed, the control device 700 is used to control the opening of the first damper 131, the second damper 132 and the third damper 151, and to control the closing of the fourth damper 152; when the second cleaning mode is executed, the control device 700 is used to control the closing of the first damper 131 and the third damper 151, and to control the opening of the second damper 132 and the fourth damper 152.

[0038] Specifically, in the first cleaning mode, the control device 700 controls the opening of the first damper 131, the second damper 132, and the third damper 151, and controls the closing of the fourth damper 152, so that the exhaust airflow flows into the fresh air duct 120 through the bypass pipe (i.e. the pipe connecting the first damper 131 and the third damper 151), and merges with the fresh air flow in the fresh air duct 120, forming two turbulent airflows with opposite directions or with an angle. The irregular movement of the turbulent airflow will generate multi-directional impact force on the inner wall of the pipe, effectively removing dust, lint and other pollutants attached to the pipe wall, and can penetrate into pipe bends, connections, dead corners and other places, achieving deep cleaning of the fresh air duct 120.

[0039] For example, in the first cleaning mode, the airflow path within the fresh air unit 100 is as follows: Figure 2 As shown.

[0040] Specifically, in the second cleaning mode, the control device 700 controls the first air damper 131 and the third air damper 151 to close, and controls the second air damper 132 and the fourth air damper 152 to open, so that the airflow path is restored to the circulation mode of a conventional fresh air system, that is, fresh air is sent from the outside into the room through the fresh air unit 110, and the indoor stale air is discharged to the outside through the exhaust duct 140. In this way, the dust raised in the previous cleaning mode can be discharged from the fresh air unit 100, and the pollutants in the exhaust duct 140 can be carried away.

[0041] For example, in the second cleaning mode, the airflow path within the fresh air unit 100 is as follows: Figure 3 As shown.

[0042] Specifically, when cleaning the duct of the fresh air unit 100, the first cleaning mode can be executed first to remove and loosen pollutants by impacting the duct wall with turbulent airflow, and then the second cleaning mode can be executed to discharge the removed pollutants outdoors with unidirectional airflow.

[0043] Combination Figure 4 As shown, the first self-cleaning module 130 also includes a first filter 133. The first filter 133 is disposed at the first damper 131 and the second damper 132.

[0044] Specifically, by setting a first filter 133 at the first air damper 131 and the second air damper 132, pollutants cleaned out of the fresh air duct 120 can be effectively prevented from flowing into the room when the self-cleaning mode is executed.

[0045] Combination Figure 5 As shown, the second self-cleaning module 150 also includes a second filter 153. The second filter 153 is disposed at the third damper 151 and the fourth damper 152.

[0046] Specifically, by installing a second filter 153 at the third air damper 151 and the fourth air damper 152, pollutants from the exhaust duct can be effectively prevented from flowing back into the room.

[0047] In some embodiments, the fresh air handling unit 100 further includes a timer, a differential pressure sensor, and a PM2.5 sensor. The timer records the cumulative operating time of the fresh air handling unit 100 since the last execution of the self-cleaning mode. The differential pressure sensor is disposed in the fresh air duct 120 and the exhaust duct 140 to detect changes in differential pressure within the ducts. The PM2.5 sensor is disposed in the fresh air main unit 110 to detect the concentration of particulate matter indoors. A control device 700 is electrically connected to the timer, the differential pressure sensor, and the PM2.5 sensor, and the control device 700 determines whether to execute the self-cleaning mode based on at least one of the cumulative operating time, differential pressure change data, and particulate matter concentration.

[0048] Specifically, after the fresh air unit 100 has been running for a period of time, dust and dirt will gradually accumulate in the duct. By setting a time threshold, when the cumulative running time reaches the time threshold, the control device 700 can start the self-cleaning mode to ensure the cleanliness and normal operation of the fresh air unit 100.

[0049] Specifically, pressure difference changes within the pipeline can reflect the degree of blockage. When dust, dirt, and other contaminants accumulate in the pipeline, the ventilation resistance increases, leading to changes in pressure difference. The differential pressure sensor transmits the detected pressure difference data to the control device 700, which can determine the degree of blockage based on these changes. If the pressure difference exceeds the normal range, it indicates a potentially severe blockage, at which point the control device 700 can activate a self-cleaning mode.

[0050] Specifically, if the indoor particulate matter concentration is too high, it indicates that the fresh air unit 100 may not be effectively filtering and purifying the air, suggesting that dust accumulation in the ductwork is affecting air exchange. Therefore, the control device 700 can also determine whether to activate the self-cleaning mode based on the indoor particulate matter concentration.

[0051] In conjunction with the aforementioned fresh air handling unit, this disclosure provides a control method for the fresh air handling unit, wherein the executing entity of the control method can be the aforementioned control device. For example... Figure 6 As shown, the control method includes: S601, the control device acquires the status monitoring parameters of the fresh air handling unit.

[0052] Specifically, the status monitoring parameters include at least one of the following: the cumulative running time of the fresh air unit since the last self-cleaning mode, the pressure difference change data in the duct, and the indoor particulate matter concentration.

[0053] Specifically, the control device can obtain the cumulative running time of the fresh air unit since the last self-cleaning mode through a timer; obtain the pressure difference change data in the duct through differential pressure sensors installed in the fresh air duct and exhaust duct; and obtain the indoor particulate matter concentration through a PM2.5 sensor installed in the fresh air unit.

[0054] S602, the control device determines the target cleaning mode to be executed based on the self-cleaning trigger conditions met by the status monitoring parameters.

[0055] Specifically, different status monitoring parameters reflect the level of contamination within the fresh air handling unit's ductwork. Therefore, based on the self-cleaning trigger conditions met by the status monitoring parameters, it can be determined whether duct cleaning is necessary and, if so, which method to use. For example, if only the cumulative operating time is long, while the differential pressure change data and particulate matter concentration are within normal ranges, a standard self-cleaning mode can be executed to thoroughly clean both the fresh air and exhaust ducts. Conversely, if the differential pressure change data and particulate matter concentration are not within normal ranges, an enhanced self-cleaning mode can be executed. Therefore, the control device can determine the target cleaning mode to be executed based on the self-cleaning trigger conditions met by the status monitoring parameters.

[0056] S603, the control device controls the opening and closing status of the dampers of the first self-cleaning module and the second self-cleaning module according to the control strategy corresponding to the target self-cleaning mode.

[0057] Specifically, different target cleaning modes require different airflow paths and cleaning methods. By controlling the opening and closing states of the dampers of the first and second self-cleaning modules, that is, by controlling the opening or closing of the first damper, the second damper, the third damper and the fourth damper, the airflow path in the fresh air duct and the exhaust air duct can be changed, thereby achieving different self-cleaning effects.

[0058] In this embodiment, during the operation of the fresh air handling unit, status monitoring parameters of the unit's operation can be acquired. These parameters are then compared to the self-cleaning trigger conditions to determine whether a self-cleaning mode needs to be executed, and if so, the target cleaning mode to be executed. After determining the target cleaning mode, the opening and closing states of the dampers of the first and second self-cleaning modules can be controlled according to the control strategy corresponding to the target self-cleaning mode. This achieves self-cleaning of the fresh air handling unit's ductwork, ensuring the quality of the air entering the room.

[0059] In some embodiments, the status monitoring parameters include the cumulative running time of the fresh air unit since the last execution of the self-cleaning mode, the pressure difference change data in the duct, and the indoor particulate matter concentration; the self-cleaning mode includes a first cleaning mode and a second cleaning mode; the target cleaning mode to be executed is determined according to the self-cleaning trigger conditions satisfied by the status monitoring parameters, including: when the cumulative running time is greater than or equal to a duration threshold, the first cleaning mode and the second cleaning mode are jointly determined as the target cleaning mode; when the cumulative running time is less than the duration threshold and the particulate matter concentration is greater than or equal to a first concentration threshold, the first cleaning mode and the second cleaning mode are jointly determined as the target cleaning mode; when the cumulative running time is less than the duration threshold and the particulate matter concentration is greater than or equal to a second concentration threshold and less than a first concentration threshold, the target cleaning mode is determined based on the pressure difference change data.

[0060] Specifically, if the cumulative runtime of the fresh air handling unit is greater than or equal to the time threshold, it indicates that the fresh air handling unit has been running for a considerable period of time since the last duct self-cleaning, and a large amount of dust and dirt may have accumulated inside the duct. In this case, setting both the first and second cleaning modes as the target cleaning mode can comprehensively and thoroughly clean the fresh air handling unit duct, ensuring that dust, dirt, and other pollutants inside the duct are effectively removed.

[0061] Optionally, the duration threshold is 500 to 720 hours.

[0062] Specifically, if the cumulative running time is less than the duration threshold, but the particulate matter concentration is greater than or equal to the first concentration threshold, it indicates that the indoor air quality is poor and the fresh air unit is not effectively introducing fresh air. This may be due to a large amount of pollutants accumulating in the ductwork. Therefore, in this case, both the first and second cleaning modes should be selected as the target cleaning modes to thoroughly clean the ductwork of the fresh air unit.

[0063] Optionally, the first concentration threshold is 300 to 350 μg / m³.

[0064] Specifically, if the cumulative runtime is less than the duration threshold, and the particulate matter concentration is greater than or equal to the second concentration threshold but less than the first concentration threshold, it indicates that the indoor air quality has declined to some extent, but the situation is not serious. Therefore, in this case, it is necessary to further determine the extent of contaminant blockage in the pipes based on the pressure difference data within the pipes, and then determine the target cleaning mode to be adopted.

[0065] Optionally, the second concentration threshold is 100 to 150 μg / m³.

[0066] Optionally, the differential pressure change data includes a first differential pressure ratio of the fresh air duct and a second differential pressure ratio of the exhaust air duct. When the cumulative operating time is less than a duration threshold and the particulate matter concentration is greater than or equal to a second concentration threshold and less than a first concentration threshold, the target cleaning mode is determined based on the differential pressure change data, including: when both the first and second differential pressures are greater than or equal to the first differential pressure threshold, the first and second cleaning modes are jointly determined as the target cleaning mode; when the first differential pressure is greater than or equal to the first differential pressure threshold and the second differential pressure is less than the first differential pressure threshold, the first cleaning mode is determined as the target cleaning mode; when the first differential pressure is less than the first differential pressure threshold and the second differential pressure is greater than or equal to the first differential pressure threshold, the second cleaning mode is determined as the target cleaning mode.

[0067] Specifically, after initial installation or after each effective self-cleaning, the fresh air handling unit automatically records and stores the reference pressure difference P0 between the beginning and end of the fresh air duct and the reference pressure difference P1 between the beginning and end of the exhaust duct at standard wind speed. Each time the fresh air handling unit is turned on, after controlling the fan of the fresh air unit to run at the same standard speed for a preset time (e.g., 5 minutes), it will measure the current pressure difference P2 between the beginning and end of the fresh air duct and the current pressure difference P3 between the beginning and end of the exhaust duct. The first pressure difference ratio = (P2 - P0) / P0; the second pressure difference ratio = (P3 - P1) / P0.

[0068] Specifically, if the cumulative running time is less than the duration threshold, and the particulate matter concentration is greater than or equal to the second concentration threshold but less than the first concentration threshold, and if both the first and second pressure differentials are greater than or equal to the first pressure differential threshold, it indicates that both the fresh air duct and the exhaust duct have significant ventilation resistance issues. Therefore, in this case, both the first and second cleaning modes should be selected as the target cleaning modes to thoroughly clean the fresh air unit's ductwork.

[0069] Specifically, if the cumulative running time is less than the duration threshold, and the particulate matter concentration is greater than or equal to the second concentration threshold and less than the first concentration threshold, and if the first pressure difference is greater than or equal to the first pressure difference threshold and the second pressure difference is less than the first pressure difference threshold, it indicates that only the fresh air duct has a relatively serious ventilation resistance problem. Therefore, in this case, only the first cleaning mode should be selected as the target cleaning mode, and the fresh air duct should be cleaned.

[0070] Specifically, if the cumulative running time is less than the duration threshold, and the particulate matter concentration is greater than or equal to the second concentration threshold and less than the first concentration threshold, and if the first pressure difference is less than the first pressure difference threshold, and the second pressure difference is greater than or equal to the first pressure difference threshold, it indicates that only the exhaust duct has a relatively serious ventilation resistance problem. Therefore, in this case, only the second cleaning mode is determined as the target cleaning mode, and the exhaust duct is cleaned.

[0071] Optionally, if the cumulative running time is less than the duration threshold and the particulate matter concentration is greater than or equal to the second concentration threshold and less than the first concentration threshold, the target cleaning mode is determined based on the differential pressure change data, including: if the first differential pressure and the second differential pressure are greater than or equal to the second differential pressure threshold and less than the first differential pressure threshold, prompting the user that the fresh air duct and / or exhaust air duct may need cleaning; if both the first differential pressure and the second differential pressure are less than the second differential pressure threshold, confirming that the fresh air unit is executing a self-cleaning mode that does not require self-cleaning.

[0072] Optionally, the first differential pressure threshold is 25% to 30%, and the second differential pressure threshold is 15% to 20%.

[0073] Optionally, if the target self-cleaning mode includes a first cleaning mode and a second cleaning mode, the first cleaning mode is executed first and lasts for a first set duration, and then the second cleaning mode is switched to and lasts for a second set duration.

[0074] Specifically, the first cleaning mode can use turbulent airflow to impact the pipe wall, stripping and loosening pollutants. Then, the second cleaning mode can use unidirectional airflow to discharge the stripped pollutants outdoors.

[0075] Optionally, the first set duration is 20 to 30 minutes, and the second set duration is 10 to 20 minutes.

[0076] In this embodiment, the target cleaning mode to be executed is determined based on the cumulative running time of the fresh air unit since its last self-cleaning mode, the pressure difference change data in the duct, and the indoor particulate matter concentration. This allows for a more accurate determination of whether the fresh air unit's ductwork needs cleaning and how to perform the cleaning, improving the relevance and accuracy of the determined target cleaning mode.

[0077] In some embodiments, after controlling the opening and closing states of the dampers of the first self-cleaning module and the second self-cleaning module according to the control strategy corresponding to the target self-cleaning mode, the control method further includes: obtaining the current pressure difference in the duct and / or the current particulate matter concentration in the room; and adjusting the fan speed of the fresh air unit according to the current pressure difference and / or the current particulate matter concentration.

[0078] Specifically, based on the current pressure difference within the duct or the current particulate matter concentration indoors, the current level of blockage by pollutants in the duct can be determined during the duct cleaning process. If the blockage remains severe, the fan speed of the fresh air unit can be increased to enhance the airflow into the duct. If the blockage situation changes, the fan speed of the fresh air unit can be adjusted accordingly to ensure adequate airflow into the duct while preventing excessive airflow from causing pollutants to flow back into the room.

[0079] Combination Figure 7 As shown, this disclosure provides a control device 700 for a fresh air handling unit, including a processor 701 and a memory 702. Optionally, the device may further include a communication interface 703 and a bus 704. The processor 701, communication interface 703, and memory 702 can communicate with each other via the bus 704. The communication interface 703 can be used for information transmission. The processor 701 can call logical instructions in the memory 702 to execute the control method for the fresh air handling unit described in the above embodiment.

[0080] Furthermore, the logic instructions in the aforementioned memory 702 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0081] The memory 702, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 701 executes functional applications and data processing by running the program instructions / modules stored in the memory 702, thereby implementing the control method for the fresh air unit in the above embodiments.

[0082] The memory 702 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 702 may include high-speed random access memory and may also include non-volatile memory.

[0083] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described control method for a fresh air handling unit.

[0084] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0085] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0086] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0087] The methods and products disclosed in the embodiments herein (including but not limited to devices and equipment) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0088] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A fresh air handling unit, characterized in that, include: Fresh air unit; The first self-cleaning module is installed in the fresh air duct connected to the fresh air unit. The first self-cleaning module includes a first damper and a second damper. The second self-cleaning module is installed in the exhaust duct connected to the fresh air unit. The second self-cleaning module includes a third damper and a fourth damper; the first damper and the third damper are connected by a duct. The control device is electrically connected to the fresh air unit, the first air damper, the second air damper, the third air damper, and the fourth air damper. The control device is used to control the opening and closing status of the first air damper, the second air damper, the third air damper, and the fourth air damper, switch the airflow path in the fresh air duct and the exhaust air duct, and enable the fresh air unit to perform a self-cleaning mode.

2. The fresh air handling unit according to claim 1, characterized in that, The self-cleaning modes include a first cleaning mode and a second cleaning mode; When the first cleaning mode is executed, the control device is used to control the opening of the first air door, the second air door and the third air door, and to control the closing of the fourth air door; When the second cleaning mode is executed, the control device is used to control the first and third air dampers to close, and to control the second and fourth air dampers to open.

3. The fresh air handling unit according to claim 1, characterized in that, The first self-cleaning module also includes: a first filter screen, which is disposed at the first air damper and the second air damper; The second self-cleaning module also includes a second filter screen, which is located at the third and fourth air dampers.

4. The fresh air handling unit according to any one of claims 1 to 3, characterized in that, Also includes: A timer is used to record the cumulative running time of the fresh air unit since the last time it executed the self-cleaning mode; Differential pressure sensors are installed in fresh air ducts and exhaust air ducts to detect changes in differential pressure within the ducts; A PM2.5 sensor, installed in the fresh air unit, is used to detect the concentration of particulate matter indoors; The control device is electrically connected to a timer, a differential pressure sensor, and a PM2.5 sensor. The control device is used to determine whether to execute the self-cleaning mode based on at least one of the following: cumulative running time, differential pressure change data, and particulate matter concentration.

5. A control method for a fresh air handling unit, applied to a fresh air handling unit as described in any one of claims 1 to 4, characterized in that, Control methods include: Obtain the status monitoring parameters of the fresh air handling unit; Based on the self-cleaning trigger conditions met by the status monitoring parameters, determine the target cleaning mode to be executed; According to the control strategy corresponding to the target self-cleaning mode, control the opening and closing status of the dampers of the first self-cleaning module and the second self-cleaning module.

6. The control method according to claim 5, characterized in that, The status monitoring parameters include the cumulative running time of the fresh air unit since the last self-cleaning mode, the pressure difference change data in the duct, and the indoor particulate matter concentration; the self-cleaning modes include the first cleaning mode and the second cleaning mode; Based on the self-cleaning trigger conditions met by the status monitoring parameters, determine the target cleaning mode to be executed, including: If the cumulative runtime is greater than or equal to the runtime threshold, the first cleaning mode and the second cleaning mode will be jointly determined as the target cleaning mode. If the cumulative running time is less than the duration threshold and the particulate matter concentration is greater than or equal to the first concentration threshold, the first cleaning mode and the second cleaning mode will be jointly determined as the target cleaning mode. If the cumulative running time is less than the duration threshold and the particulate matter concentration is greater than or equal to the second concentration threshold but less than the first concentration threshold, the target cleaning mode is determined based on the pressure difference change data.

7. The control method according to claim 6, characterized in that, Pressure difference change data includes the first pressure difference ratio of the fresh air duct and the second pressure difference ratio of the exhaust air duct; when the cumulative running time is less than the duration threshold and the particulate matter concentration is greater than or equal to the second concentration threshold and less than the first concentration threshold, the target cleaning mode is determined based on the pressure difference change data, including: When both the first differential pressure and the second differential pressure are greater than or equal to the first differential pressure threshold, the first cleaning mode and the second cleaning mode are jointly determined as the target cleaning mode. If the first differential pressure is greater than or equal to the first differential pressure threshold and the second differential pressure is less than the first differential pressure threshold, the first cleaning mode is determined as the target cleaning mode. If the first differential pressure is less than the first differential pressure threshold and the second differential pressure is greater than or equal to the first differential pressure threshold, the second cleaning mode is determined as the target cleaning mode.

8. The control method according to claim 6 or 7, characterized in that, If the target self-cleaning mode includes a first cleaning mode and a second cleaning mode, the first cleaning mode is executed first and lasts for a first set duration, and then the second cleaning mode is switched to and lasts for a second set duration.

9. The control method according to any one of claims 5 to 7, characterized in that, After controlling the opening and closing states of the dampers of the first and second self-cleaning modules according to the control strategy corresponding to the target self-cleaning mode, the control method further includes: Obtain the current differential pressure in the pipeline and / or the current particulate matter concentration in the room; Adjust the fan speed of the fresh air unit based on the current pressure difference and / or the current particulate matter concentration.

10. A control device for a fresh air handling unit, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute, when running the program instructions, the control method for a fresh air handling unit as described in any one of claims 5 to 9.

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