An air purifier system

Abstract

This invention belongs to the field of air purification technology, specifically disclosing an air purifier system, including a housing, a purification module, a differential pressure module, and a control module. The control module is equipped with a state machine to define multiple discrete operating states and state transition directions, and an asymmetric hysteresis threshold is configured for each state transition direction. This threshold includes an upper threshold H. up With lower threshold H down And H up >H down The control module also includes an integral counter, used to accumulate counts when the real-time differential pressure signal crosses an upper or lower threshold, and to accumulate counts until a preset integral window W is reached. integrate The corresponding state transition command is triggered in time. This invention effectively filters out signal interference and suppresses state oscillation by combining asymmetric hysteresis and integral judgment, avoiding frequent switching of wind turbine power and state oscillation, thus effectively improving the stability and reliability of system control.

Description

Technical Field

[0001] This invention belongs to the field of air purification technology, and particularly relates to an air purifier system. Background Technology

[0002] Pet-owning families constantly face the dual challenges of pet hair shedding and odor diffusion. Current air purification devices primarily rely on fans to drive airflow circulation, treating air pollutants through physical interception. A typical structure uses a grille or a simple filter at the air inlet, with the airflow then directed directly to a high-efficiency particulate air (HEPA) filter. While this design can block some large hairs, the continuous pressure difference allows fine hairs to penetrate the barrier and embed themselves deep within the HEPA filter. Once clogged with hair, the HEPA filter is not only difficult to clean thoroughly but also accelerates filter aging, significantly shortening its lifespan, reducing purification efficiency, and increasing maintenance costs. Furthermore, HEPA filters only filter particulate matter and lack the ability to decompose volatile odor components such as ammonia and sulfides produced by pet metabolism, failing to effectively eliminate indoor odor pollution.

[0003] Some improved equipment attempts to incorporate differential pressure monitoring sensors to assess the degree of filter clogging. However, in actual operation, when the differential pressure signal fluctuates randomly within the critical threshold range, the control system is prone to false triggering, causing the fan operating power to repeatedly switch between high and low levels or frequently alternate between start and stop states, resulting in obvious oscillations. This fluctuation not only increases equipment operating noise, disturbing users' lives, but also exacerbates fatigue damage to mechanical components and reduces the long-term reliability of the system. Existing technology lacks an effective mechanism to distinguish the nature of signal fluctuations, making it difficult to differentiate between instantaneous noise interference and actual changes in clogging trends, leading to a decline in user experience and low equipment maintenance efficiency.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0005] The purpose of this invention is to provide an air purifier system to solve the technical problem of frequent system state oscillation caused by differential pressure signal fluctuations in the prior art, and to achieve stable and reliable system operation and control.

[0006] To achieve the above objectives, the present invention provides an air purifier system, comprising: The casing has an air inlet on its side wall and an air outlet on its top surface; The purification module, housed within the housing, includes at least a fan for guiding airflow and an electrostatic electret filter for actively capturing and filtering hair. The differential pressure module is installed in the airflow path of the purification module and is used to collect real-time differential pressure signals before and after the electrostatic electret filter. The control module is connected to the differential pressure module and the purification module via signals. The control module is equipped with at least a state machine, which is used to define multiple discrete operating states and state transition directions; The control module configures an asymmetric hysteresis threshold for each state transition direction. The asymmetric hysteresis threshold includes an upper threshold. With lower threshold ,and ; The control module is also equipped with an integral counter, which is used to accumulate counts when the real-time differential pressure signal crosses the upper or lower threshold, and to accumulate counts until a preset integral window is reached. The corresponding state transition instruction is triggered at that time.

[0007] Furthermore, the state machine includes a state unit and a discrimination unit, and the integral counter includes a counting unit and an execution unit. The state unit is signal-connected to the counting unit through the discrimination unit, and the counting unit is signal-connected to the execution unit for coordinated execution of state transitions. The state unit maintains the current discrete operating state and the expected jump direction; The discrimination unit receives the real-time differential pressure signal and compares it with the upper threshold H corresponding to the current state. up and lower threshold H down Perform a comparison; The counting unit continuously accumulates and counts forward or reverse crossing events based on the comparison results from the discrimination unit. The execution unit accumulates the value in the counting unit until the integral window W is reached. integrate When this occurs, the output status jump command is used to adjust the operating power of the fan in the purification module and / or trigger a maintenance alarm.

[0008] Furthermore, the purification module also includes a fine filter, a partition plate, and a positioning ring; the side wall of the housing has multiple air inlets to form a ring-shaped air inlet structure, and the electrostatic electret filter is installed on the inner wall of the housing. The number of electrostatic electret filters is the same as the number of air inlets and their positions correspond one-to-one. The fine filter screen is installed inside the housing and is coaxially arranged with the housing. The fine filter screen has a hollow cylindrical structure and is configured with side air intake and axial air exhaust. The partition plate has a radially closed annular structure. The partition plate is pressed against the top surface of the fine filter screen, and the outer edge of the partition plate is attached to the inner wall of the housing. The partition plate is provided with a clearance groove corresponding to the position of the electrostatic electret filter screen. The positioning ring is located in the inner ring of the annular structure of the partition plate. The positioning ring is inserted and engaged with the inner wall of the hollow cavity of the fine filter screen to achieve radial and axial positioning of the fine filter screen.

[0009] Furthermore, the differential pressure module includes a pressure port group and a miniature differential pressure transmitter. The pressure port group includes a first pressure port, a second pressure port, and a third pressure port distributed sequentially along the gas flow direction. The first pressure port is located before the electrostatic electret filter, the second pressure port is located between the electrostatic electret filter and the fine filter, and the third pressure port is located after the fine filter. The miniature differential pressure transmitter is installed in the housing or partition plate and is connected to the first pressure port, the second pressure port, and the third pressure port respectively. It is used to calculate the first differential pressure between the first pressure port and the second pressure port, and the second differential pressure between the second pressure port and the third pressure port, and outputs the first differential pressure and the second differential pressure as real-time differential pressure signals to the control module.

[0010] Furthermore, the purification module also includes an ultraviolet lamp and an air freshener. The fan is installed inside the cylinder and located near the air outlet. The ultraviolet lamp is located in the hollow cavity of the fine filter. The air freshener is detachably installed on the top surface of the partition plate and located between the partition plate and the fan.

[0011] Furthermore, the purification module also includes a cleaning brush. The inner wall of the housing is provided with mounting slots for installing electrostatic electret filters. Each air inlet has a mounting slot on both sides. The electrostatic electret filter is slidably installed on the inner wall of the housing through the mounting slots, and after installation, the electrostatic electret filter is attached to the corresponding air inlet. Each air inlet has a sliding groove on both sides. The two ends of the cleaning brush are provided with mounting sliders that slide with the sliding grooves. The cleaning brush is slidably installed on the air inlet through the mounting sliders. In the installed state, the bristles of the cleaning brush are attached to the outer surface of the electrostatic electret filter, and are used to scrape off the attached hair when the electrostatic electret filter and the cleaning brush move relative to each other.

[0012] Furthermore, the cumulative count update logic of the counting unit satisfies: ; ; Where t is the index of the discrete sampling time, P t Let C be the real-time differential pressure signal value at time t, S be the current discrete operating state, S→S+1 represents the forward jump direction, and S+1→S represents the reverse jump direction. up (t) and C down (t) represents the forward cumulative count and the reverse cumulative count at time t, respectively.

[0013] Furthermore, the upper threshold The value is 1.1 to 1.3 times the nominal differential pressure corresponding to the state transition, and the lower threshold is... The value is 0.8 to 0.9 times the nominal differential pressure corresponding to the state transition; Integral window With Integral Window The value ranges from 5 to 30 samples.

[0014] Furthermore, the discrete operating states include a static state S0, a low-power state S1, a high-power state S2, and a shutdown alarm state S3. The status transition instructions include: increasing the fan power of the purification module or outputting a filter cleaning alarm when a positive transition is triggered; reducing the fan power or deactivating the alarm when a reverse transition is triggered; and cutting off the fan operation and outputting a filter replacement alarm when entering the shutdown alarm state S3.

[0015] Furthermore, the control module also includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, is used to implement the following steps: Collect real-time pressure difference signals before and after the filter. ; Based on the current discrete operating state of the state machine Given the desired jump direction, query the corresponding asymmetric hysteresis threshold. The asymmetric hysteresis threshold includes the upper threshold. With lower threshold ,and ; Real-time differential pressure signal With upper threshold and lower threshold Perform a comparison and adjust the forward traversal event counter based on the comparison results. Or reverse travel event counter Perform continuous cumulative counting, and reset the corresponding counter to zero when a reverse crossover occurs; Determine the forward travel event counter Or reverse travel event counter Has the accumulated value reached the preset points window? ; If the points window is reached If this occurs, the corresponding state transition command will be triggered, executing the wind turbine power adjustment or maintenance alarm action, and the positive crossover event counter will be updated. With the reverse travel event counter Set to zero synchronously.

[0016] The beneficial effects of this technical solution are as follows: This invention provides an air purifier system that uses a control module configured with a state machine, sets an asymmetric hysteresis threshold for each state transition direction, and employs an integral counter for continuous accumulation and judgment. The asymmetric hysteresis threshold establishes an asymmetric hysteresis range for system state transitions, ensuring that the real-time differential pressure signal must traverse different paths to trigger a positive transition when rising from below the lower threshold and to trigger a reverse transition when falling from above the upper threshold. This effectively prevents the differential pressure signal from directly triggering a state switch when there are minor fluctuations near a single threshold. Furthermore, the integral counter requires the real-time differential pressure signal to continuously cross the corresponding threshold (upper or lower threshold) for a preset integration window number of times before finally triggering the state transition command. This mechanism effectively filters out instantaneous noise interference or short-term fluctuations; the system only confirms the need for a state transition when the signal change shows a continuous and stable trend. Therefore, this invention can significantly suppress frequent state switching and oscillations caused by signal fluctuations, improving the stability and reliability of the air purifier system. Compared with existing technologies, this invention uses a state machine, an asymmetric hysteresis threshold, and an integral counter in the control module to accumulate and count the differential pressure signal, effectively filtering out instantaneous fluctuation interference, avoiding frequent switching of wind turbine power and state oscillation, and significantly improving the reliability of system operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the working logic of the control module of an air purifier system according to the present invention; Figure 2 A structural front view of an air purifier system for the invention; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 for Figure 2 Sectional view at point BB; Figure 5 for Figure 2 Sectional view at CC; Figure 6 This is a schematic diagram of the partition plate structure; Figure 7 This is a schematic diagram of the shell structure; Figure 8 A structural diagram showing the mounting slots and slides; Figure 9 This is a schematic diagram of the structure of a cleaning brush; Reference numerals: 1-Housing; 101-Air inlet; 102-Air outlet; 103-Mounting slot; 104-Slide groove; 2-Electrostatic electret filter; 3-Cleaning brush; 301-Mounting slider; 302-Brush bristles; 4-Fine filter; 5-Divider plate; 501-Allowing groove; 6-Positioning ring; 7-Ultraviolet lamp; 8-Air fragrance; 9-Fan; 10-Miniature differential pressure transmitter; 11-First pressure port; 12-Second pressure port; 13-Third pressure port; 14-Control module. Detailed Implementation

[0018] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figure 1-9 As shown, an embodiment of the present invention illustrates an air purifier system, comprising: The housing 1 has air inlets 101 on its side walls and air outlets 102 on its top surface. The housing 1 is the external structure of the air purifier system, typically made of a robust material, and houses core components such as the purification module, differential pressure module, and control module 14. The housing 1 can be made of various materials and structural forms; for example, it can be integrally molded from plastic or metal. Multiple air inlets 101, arranged in a circular or rectangular pattern, are provided on the side walls to guide external air in. The air outlets 102 are located in the center of the top surface of the housing 1, or distributed in a circular array on the top surface, to discharge purified air. Thus, the entire purifier system constitutes a side-inlet, top-outlet gas flow system.

[0020] The purification module, housed within the casing 1, includes at least a fan 9 for guiding airflow and an electrostatic electret filter 2 for actively capturing and filtering pet hair. The purification module is the core component for achieving air purification, and it contains at least the fan 9 and the electrostatic electret filter 2. The fan 9 drives the airflow to circulate within the system, while the electrostatic electret filter 2 actively captures and filters particulate matter in the air, especially pet hair. The fan 9 can be a centrifugal fan or an axial fan, bolted to a bracket inside the casing 1. The electrostatic electret filter 2 can be a sheet-like structure, fixed to the airflow path by snaps or adhesive, for example, behind the air inlet 101. This filter captures hair and larger particles through electrostatic adsorption.

[0021] A differential pressure module, positioned along the airflow path of the purification module, is used to collect real-time differential pressure signals before and after the electrostatic electret filter 2. This module monitors the operating status of the filters within the purification module. By collecting the pressure difference before and after the electrostatic electret filter 2, the module generates a real-time differential pressure signal to reflect the degree of filter clogging.

[0022] Control module 14 is signal-connected to the differential pressure module and the purification module; control module 14 is equipped with at least a state machine, which defines multiple discrete operating states and state transition directions; control module 14 configures an asymmetric hysteresis threshold for each state transition direction, the asymmetric hysteresis threshold including an upper threshold. With lower threshold ,and The control module 14 is also equipped with an integral counter, which is used to accumulate counts when the real-time differential pressure signal crosses the upper or lower threshold, and to accumulate counts until a preset integral window is reached. The corresponding state transition instruction is triggered at that time.

[0023] The control module 14 is the core control unit of the entire air purifier system. It is responsible for receiving signals from the differential pressure module and controlling the purification module according to preset logic. This module processes real-time data to determine the operating power of the fan 9, trigger maintenance alarms, and perform other operations. The control module 14 can be a microcontroller unit (MCU) that establishes a connection with the differential pressure module and the purification module via wires or wireless communication. For example, the differential pressure module can send real-time differential pressure signals to the control module 14 via I2C or SPI interfaces. The control module 14 can then control the speed or start / stop of the fan 9 in the purification module via PWM signals or relays. The state machine is a logical structure within the control module 14 used to define multiple discrete operating states that the system may be in. The state machine can be implemented in the firmware of the control module 14 through software logic. For example, discrete operating states such as "standby," "low speed," "medium speed," and "high speed" can be defined. Each state can preset a specific fan 9 speed or operating mode. Meanwhile, the state machine also defines the allowed transition directions between these states; discrete operating states refer to the stable states of the system under different operating modes. Each state corresponds to specific operating parameters and behaviors. The state transition direction refers to the path by which the system transitions from one discrete operating state to another. The state transition direction of the state machine can be defined as from "low speed" to "medium speed", or from "high speed" to "low speed", etc. These transition paths are explicitly encoded in the software.

[0024] The asymmetric hysteresis threshold is a set of criteria configured for each state transition direction, including an upper threshold H. up With a lower threshold H down The upper threshold H up Typically greater than the lower threshold H downThis creates a hysteresis interval, preventing the system from frequently switching states near the critical point. The asymmetric hysteresis threshold can be stored in the memory of the control module 14 in the form of a lookup table. For example, for the jump direction from "low speed" to "medium speed", a higher upper threshold H can be set. up For the reverse jump from "medium speed" to "low speed", a lower threshold H is set. down These thresholds can be set based on empirical values ​​or experimental data to ensure H up Always greater than H down This forms a hysteresis interval.

[0025] The integral counter is a timing or counting mechanism in control module 14, used to accumulate counts when the real-time differential pressure signal crosses an upper or lower threshold. This counter determines the duration of the signal crossing through continuous accumulation, distinguishing between instantaneous fluctuations and true trend changes. A preset integral window W is provided. integrate This is the continuous accumulated count value required for the integrator counter to reach the state jump command. The system will only confirm the state change and execute the corresponding command when the real-time differential pressure signal continuously crosses the threshold and reaches this preset window. The state jump command is an operation command issued by the control module 14 based on the accumulated result of the integrator counter, such as adjusting the power of fan 9, triggering filter cleaning or replacement alarms, etc., to respond to changes in the system's operating state. The integrator counter can be implemented as a variable in the software of the control module 14. The counter accumulates when the real-time differential pressure signal remains above (or below) a certain threshold for multiple consecutive sampling periods. For example, if the differential pressure signal is above the upper threshold H for 5 consecutive sampling periods... up The counter accumulates to 5. Once the counter value reaches the preset integration window W... integrate For example, after 10 samples, control module 14 will issue a corresponding state transition command. If the signal crosses in the reverse direction during the accumulation process, the counter will be reset to zero.

[0026] The air purifier system in this embodiment actively captures hair by configuring an electrostatic electret filter 2, effectively alleviating the problems of easy clogging and short lifespan of traditional filters. Simultaneously, combined with real-time monitoring of the filter status by the differential pressure module and the state anti-shaking switching mechanism based on an asymmetric hysteresis threshold and an integral counter in the control module 14, the system can stably respond to the degree of filter clogging, avoiding frequent start-stop or power fluctuations of the fan 9, improving operational stability and user comfort, and reducing maintenance costs.

[0027] In this embodiment, the state machine includes a state unit and a discrimination unit, and the integral counter includes a counting unit and an execution unit. The state unit is signal-connected to the counting unit through the discrimination unit, and the counting unit is signal-connected to the execution unit for coordinated execution of state transitions. The state unit maintains the current discrete operating state and the desired transition direction. The discrimination unit receives the real-time differential pressure signal and compares it with the upper threshold H corresponding to the current state. up and lower threshold H down The comparison is performed; the counting unit continuously accumulates counts of forward or reverse crossing events based on the comparison results from the discrimination unit; the execution unit executes the count when the accumulated value of the counting unit reaches the integration window W. integrate When this occurs, the output status jump command is used to adjust the operating power of the fan 9 of the purification module and / or trigger a maintenance alarm.

[0028] Specifically, the state unit maintains the current discrete operating state and the expected transition direction. The state unit is the core component of the state machine, and its main function is to record and manage the current operating state of the air purifier system (e.g., stationary, low power, high power, etc.). Simultaneously, it maintains the next possible transition direction expected based on the current state and system logic. This maintenance mechanism provides the discrimination unit with contextual information for threshold comparison, ensuring the logical correctness of state transitions. The discrimination unit receives the real-time differential pressure signal and compares it with the upper threshold H corresponding to the current state. up and the lower threshold H down The comparison is performed. The discrimination unit is responsible for real-time monitoring of pressure difference changes along the airflow path of the purification module. It receives real-time pressure difference signals from the pressure difference module and, based on the current operating status and desired jump direction provided by the status unit, queries and obtains the corresponding asymmetric hysteresis threshold, i.e., the upper threshold H. up and lower threshold H down Subsequently, the discrimination unit precisely compares the real-time differential pressure signal with these thresholds to determine whether the differential pressure signal has crossed the preset threshold, thus providing the counting unit with a basis for triggering cumulative counting. Based on the comparison results from the discrimination unit, the counting unit continuously accumulates counts for either forward or reverse crossing events. This continuous accumulation counting mechanism filters out instantaneous signal fluctuations; only when the differential pressure signal consistently and stably crosses the threshold for a period of time is it considered a valid state transition signal, thereby enhancing the system's anti-interference capability. The execution unit then executes when the accumulated value in the counting unit reaches the integration window W. integrateWhen necessary, the output state transition command adjusts the operating power of the fan 9 of the purification module and / or triggers a maintenance alarm. These commands include, but are not limited to, adjusting the operating power of the fan 9 of the purification module (e.g., increasing from low power to high power, or decreasing from high power to low power), or triggering a maintenance alarm (e.g., filter cleaning alarm or filter replacement alarm). In this way, the execution unit ensures that only fully confirmed differential pressure changes will lead to actual changes in system state or trigger maintenance actions, avoiding misoperation. This embodiment refines the state machine and integral counter into state units, discrimination units, counting units, and execution units, and clarifies the signal connections and collaborative working mechanisms between them, effectively solving the problem of frequent system state switching caused by real-time differential pressure signal fluctuations or noise. The state unit maintains the current state and the expected transition direction, providing context for the discrimination unit to ensure the accuracy of the comparison. The discrimination unit accurately compares the real-time differential pressure signal with the asymmetric hysteresis threshold corresponding to the current state and transmits the preliminary judgment result to the counting unit. The counting unit effectively filters out instantaneous interference by continuously accumulating counts of forward or reverse crossing events. The accumulated value only reaches the integration window when the differential pressure signal consistently and stably meets the jump condition. Finally, the execution unit outputs a state jump command only after confirming that the accumulated value has reached the preset integration window, thus avoiding misjudgments and unnecessary fan power adjustment or maintenance alarms caused by instantaneous signal fluctuations. This modular and collaborative design significantly improves the robustness, stability, and reliability of the air purifier system's state jumps, ensuring accurate operation and maintenance of the system in complex environments.

[0029] In this embodiment, the purification module further includes a fine filter 4, a partition plate 5, and a positioning ring 6; the side wall of the housing 1 is provided with multiple air inlets 101 to form an annular air inlet structure; the electrostatic electret filter 2 is installed on the inner wall surface of the housing 1, and the number of electrostatic electret filters 2 is the same as the number of air inlets 101 and their positions correspond one-to-one; the fine filter 4 is installed inside the housing 1 and is coaxially arranged with the housing 1; the fine filter 4 has a hollow cylindrical structure and is configured to allow air to enter from the side and exit from the axis; the partition plate 5 has a radially closed annular structure; the partition plate 5 is pressed against the top surface of the fine filter 4, and the outer edge of the partition plate 5 is attached to the inner wall of the housing 1; the partition plate 5 is provided with a clearance groove 501 corresponding to the position of the electrostatic electret filter 2; the positioning ring 6 is located in the inner ring of the annular structure of the partition plate 5; the positioning ring 6 is inserted and engaged with the inner wall of the hollow cavity of the fine filter 4 to achieve radial and axial positioning of the fine filter 4.

[0030] Specifically, the fine filter 4 added to the purification module is used to filter fine particulate matter in the air, such as PM2.5, bacteria, and viruses, and its filtration accuracy is higher than that of the electrostatic electret filter 2. The fine filter 4 can be made of high-efficiency particulate air (HEPA) material, activated carbon material, or other composite filter materials to meet different purification needs. In this embodiment, HEPA material is preferred. The partition plate 5 is mainly used to form specific airflow channels inside the purification module, guiding airflow through different filters, and also serves as support and sealing. The positioning ring 6 is used to precisely fix the fine filter 4, preventing it from shifting or shaking under the action of airflow, and ensuring the stability of the filtration effect. Multiple air inlets 101 are opened on the side wall of the housing 1. These air inlets 101 are evenly distributed on the side periphery of the housing 1, forming a surrounding air intake structure. This annular air intake design can significantly increase the effective area of ​​air entering the purifier, making the airflow distribution more uniform, thereby reducing local wind resistance, improving the overall air intake efficiency, and helping to reduce operating noise. The electrostatic electret filter 2 is installed on the inner wall of the housing 1, with the same number and position as the air inlet 101. This installation method ensures that all air entering through the air inlet 101 undergoes preliminary filtration through the electrostatic electret filter 2, effectively capturing hair, large particles, etc., protecting the subsequent fine filter 4 and extending its service life. The electrostatic electret filter 2 can be fixed to the inner wall of the housing 1 by means of clips, sliding grooves 104, magnetic attraction, or adhesive, facilitating user replacement and maintenance. The fine filter 4 is installed inside the housing 1 and coaxially arranged with the housing 1, and its structure is a hollow cylinder. This coaxial cylindrical structure makes the overall layout of the purification module more compact, which is beneficial for optimizing the airflow path. The fine filter 4 is configured with side air intake and axial air exhaust, that is, air enters from the side wall of the cylindrical filter, is filtered, and then discharged axially from the hollow cavity of the filter. This design increases the effective filtration area of ​​the filter, while reducing airflow resistance and improving purification efficiency. The partition plate 5 has a radially closed annular structure, which serves to separate the internal space of the purification module and guide airflow. The partition plate 5 is pressed against the top surface of the fine filter screen 4, and its outer edge is tightly attached to the inner wall of the housing 1, thereby forming a relatively closed space above the fine filter screen 4. This ensures that the airflow does not bypass the fine filter screen 4 and directly enter the air outlet 102, preventing air short-circuiting. In addition, the clearance groove 501 provided by the partition plate 5 provides the necessary installation space for the electrostatic electret filter screen 2, avoiding interference from the partition plate 5 on the electrostatic electret filter screen 2, making the installation and removal of the electrostatic electret filter screen 2 more convenient. The insertion and engagement method between the positioning ring 6 and the fine filter screen 4 enables precise radial and axial positioning of the fine filter screen 4. Radial positioning ensures the center position of the filter screen within the housing 1, preventing its lateral swaying; axial positioning ensures the vertical fixation of the filter screen, preventing its vertical movement.This bidirectional positioning mechanism effectively improves the installation stability of the fine filter screen 4 in the purification module, ensures the sealing between the filter screen and the partition plate 5, and thus guarantees the filtration effect.

[0031] In this embodiment, the differential pressure module includes a pressure inlet group and a micro differential pressure transmitter 10. The pressure inlet group includes a first pressure inlet 11, a second pressure inlet 12, and a third pressure inlet 13 distributed sequentially along the gas flow direction. The first pressure inlet 11 is located before the electrostatic electret filter 2, the second pressure inlet 12 is located between the electrostatic electret filter 2 and the fine filter 4, and the third pressure inlet 13 is located after the fine filter 4. The micro differential pressure transmitter 10 is installed on the housing 1 or the partition plate 5. The micro differential pressure transmitter 10 is connected to the first pressure inlet 11, the second pressure inlet 12, and the third pressure inlet 13 respectively. It is used to calculate the first differential pressure between the first pressure inlet 11 and the second pressure inlet 12, and the second differential pressure between the second pressure inlet 12 and the third pressure inlet 13, and outputs the first differential pressure and the second differential pressure as real-time differential pressure signals to the control module 14.

[0032] The pressure tapping port assembly is a device used to acquire pressure information at specific locations in the airflow channel. It consists of several pressure tapping holes or tubes, which are connected to the differential pressure measuring equipment via conduits. The design of the pressure tapping ports should ensure minimal disturbance to the airflow and accurately reflect the static pressure at their location. The first pressure tap 11 is located before the electrostatic electret filter 2 and is used to measure the airflow pressure before entering the electrostatic electret filter 2. The second pressure tap 12 is located between the electrostatic electret filter 2 and the fine filter 4 and is used to measure the airflow pressure after passing through the electrostatic electret filter 2 but before entering the fine filter 4. The third pressure tap 13 is located after the fine filter 4 and is used to measure the clean airflow pressure after passing through all filters. This segmented pressure tapping layout is the basis for realizing differential pressure measurement of each filter stage. The miniature differential pressure transmitter 10 is a sensor that can convert minute differential pressure signals into standard electrical signals (such as voltage or current). Its characteristics include small size, high sensitivity, fast response speed, and the ability to accurately capture minute pressure changes before and after the filter. The transmitter can be installed in a suitable location inside the housing 1, such as on the inner wall of the housing 1, or on the partition plate 5, to facilitate connection with the conduit of the pressure port assembly and reduce external interference. The miniature differential pressure transmitter 10 performs internal calculations by receiving pressure signals from different pressure ports. For example, by comparing the pressure values ​​of the first pressure port 11 and the second pressure port 12, a first differential pressure can be obtained, which directly reflects the resistance of the electrostatic electret filter 2. Similarly, by comparing the pressure values ​​of the second pressure port 12 and the third pressure port 13, a second differential pressure can be obtained, which reflects the resistance of the fine filter 4. This calculation method makes it possible to evaluate the performance of a single filter. The miniature differential pressure transmitter 10 transmits the calculated multiple independent differential pressure signals (i.e., the first differential pressure and the second differential pressure) to the control module 14 in the form of electrical signals. These signals are real-time, meaning that the control module 14 can continuously monitor the operating status of the filters. By configuring multiple pressure ports, the air purifier system can obtain more refined and accurate filter operating status information. By setting pressure inlets before the electrostatic electret filter 2, between the electrostatic electret filter 2 and the fine filter 4, and after the fine filter 4, and using a micro differential pressure transmitter 10 to calculate the first differential pressure (reflecting the resistance of the electrostatic electret filter 2) and the second differential pressure (reflecting the resistance of the fine filter 4), the control module 14 no longer relies solely on a single overall differential pressure signal. This allows the control module 14 to independently monitor the degree of clogging of the electrostatic electret filter 2 and the fine filter 4. When the differential pressure of either filter reaches a preset threshold, the control module 14 can trigger a maintenance alarm (e.g., prompting for cleaning the electrostatic electret filter 2 or replacing the fine filter 4), or adjust the operating power of the fan 9 to compensate for the increase in filter resistance.This sophisticated monitoring and control mechanism significantly improves the accuracy of filter maintenance, avoids unnecessary filter replacements, extends the overall lifespan of the filters, and ensures that the air purifier system maintains efficient and stable purification performance under different filter clogging levels.

[0033] In this embodiment, the purification module also includes an ultraviolet lamp 7 and an air freshener 8. A fan 9 is installed inside the cylinder and located near the air outlet 102. The ultraviolet lamp 7 is located within the hollow cavity of the fine filter 4. The air freshener 8 is detachably installed on the top surface of the partition plate 5 and located between the partition plate 5 and the fan 9. The ultraviolet lamp 7 is a device that emits ultraviolet radiation. Its main function is to utilize the sterilization and disinfection capabilities of ultraviolet light to perform secondary treatment on the air purified by the filter, effectively killing any bacteria, viruses, and other microorganisms that may remain in the air. The ultraviolet lamp 7 can use a UVC band ultraviolet light source, such as a low-pressure mercury lamp or an array of ultraviolet LED beads, to ensure a highly efficient sterilization effect. Its placement within the hollow cavity of the fine filter 4 fully utilizes the airflow channel formed by the cylindrical structure of the fine filter 4, allowing the airflow to be fully exposed to ultraviolet radiation in a relatively concentrated space before being discharged by the fan 9, thereby improving sterilization efficiency. The air freshener 8 is a device or material used to release fragrance to improve the odor of indoor air. It can take various forms, such as solid fragrance blocks, liquid fragrance boxes, or essential oil diffusers. The air freshener 8 is detachably installed on the top surface of the partition 5 and located between the partition 5 and the fan 9. This installation method allows users to easily change or replenish the fragrance according to their personal preferences and needs, while ensuring that the fragrance released by the air freshener is evenly dispersed by the fan 9 to the air outlet 102, thereby quickly and effectively improving the indoor air odor. The fan 9, as the core power component of the purification module, is installed inside the cylinder and located near the air outlet 102, forming an exhaust structure. This layout helps to create negative pressure inside the purification module, causing the airflow to pass more evenly through the electrostatic electret filter 2 and the fine filter 4, improving overall purification efficiency. At the same time, this installation position also provides reasonable space for the integration of the ultraviolet lamp 7 and the air freshener 8, allowing these additional functions to be integrated into the purification module compactly and efficiently. In a preferred embodiment, the top of the housing 1 can be designed as a detachable cover structure, with the fan 9 directly installed on the cover and powered by a connector harness. The fan 9, relying on the cover, forms a flexible modular structure. When the filter or air freshener 8 needs to be replaced, simply remove the cover and unplug the connector harness for convenient replacement. The air purifier system provided in this embodiment, while providing basic physical filtration, further achieves air sterilization and odor improvement. The ultraviolet lamp 7 is cleverly integrated into the hollow cavity of the fine filter 4. Utilizing the structural characteristics of the fine filter 4, the airflow, after passing through the fine filter 4, can receive ultraviolet irradiation in a relatively enclosed and concentrated area, thereby efficiently killing bacteria and viruses in the air while avoiding the risk of ultraviolet leakage. The detachable design of the air freshener 8 and its placement on the top surface of the partition plate 5 and in front of the fan 9 allow the fragrance released by the air freshener to be evenly and quickly diffused throughout the space by the fan 9, significantly improving the user experience.The installation position of the fan 9 near the air outlet 102 not only optimizes the airflow path and improves purification efficiency, but also provides structural convenience for the rational integration of the ultraviolet lamp 7 and the air fragrance 8, allowing these additional functions to be compactly and efficiently integrated into the purification module. Overall, this application, through its ingenious structural design, expands the functionality of the air purifier without significantly increasing the size and complexity of the device, enabling it to provide a more comprehensive and higher-quality air quality management solution.

[0034] In this embodiment, the purification module also includes a cleaning brush 3. The inner wall of the housing 1 is provided with mounting slots 103 for installing the electrostatic electret filter 2. Each air inlet 101 has a mounting slot 103 on each of its two lateral sides. The electrostatic electret filter 2 is slidably installed onto the inner wall of the housing 1 through the mounting slots 103, and after installation, the electrostatic electret filter 2 adheres to the corresponding air inlet 101. Each air inlet 101 has a sliding groove 104 on each side. The cleaning brush 3 has mounting sliders 301 at both ends of its lateral side that slide in cooperation with the sliding grooves 104. The cleaning brush 3 is slidably installed onto the air inlet 101 through the mounting sliders 301. In the installed state, the bristles 302 of the cleaning brush 3 adhere to the outer surface of the electrostatic electret filter 2, used to scrape off attached hair when the electrostatic electret filter 2 and the cleaning brush 3 move relative to each other. The cleaning brush 3 is a component used to physically remove hair attached to the surface of the electrostatic electret filter 2. The bristles 302 can be made of wear-resistant and non-deformable synthetic fiber materials, such as nylon or polypropylene, to ensure effective hair removal without damaging the filter screen during long-term use. The shape and size of the cleaning brush 3 can be designed according to the geometry of the electrostatic electret filter 2. For example, if the electrostatic electret filter 2 is planar, the cleaning brush 3 can be designed as a strip; if the electrostatic electret filter 2 is arc-shaped, the cleaning brush 3 can also be designed as arc-shaped accordingly. The cleaning brush 3 can be operated manually or automatically reciprocated or rotated by a motor or other drive device. In this embodiment, a handle is provided on the brush, configuring it as a manual structure. The inner wall of the housing 1 is provided with mounting slots 103 for installing the electrostatic electret filter 2. These mounting slots 103 are structures reserved inside the housing 1 for fixing the electrostatic electret filter 2. These slots are designed as grooves that match the edges of the electrostatic electret filter 2, so that the electrostatic electret filter 2 can be accurately and securely positioned. The mounting slots 103 ensure that the electrostatic electret filter 2 will not shift under airflow impact, while also facilitating filter installation and removal for users. One mounting slot 103 is provided on each of the two lateral sides of any air inlet 101. This layout ensures that the electrostatic electret filter 2 fits tightly against the air inlet 101, forming an effective primary filtration barrier. By providing mounting slots 103 on both sides of the air inlet 101, the electrostatic electret filter 2 can be firmly fixed at the very front of the airflow entering the housing 1, thereby maximizing its hair capture efficiency. The electrostatic electret filter 2 is slidably installed onto the inner wall of the housing 1 via the mounting slots 103, and after installation, the electrostatic electret filter 2 fits against the corresponding air inlet 101. This sliding installation method provides a convenient and reliable filter installation method. Users simply push the electrostatic electret filter 2 in along the direction of the mounting slot 103 to complete the installation. After installation, the electrostatic electret filter 2 fits tightly against the air inlet 101, preventing airflow short-circuiting and ensuring that all incoming air passes through the filter, thus guaranteeing the purification effect. The slide 104 is a track structure designed to guide the movement of the cleaning brush 3.The slide groove 104 engages with the mounting slider 301 of the cleaning brush 3. The precise design of the slide groove 104 ensures that the cleaning brush 3 maintains proper contact with the surface of the electrostatic electret filter 2 during movement, achieving uniform and effective cleaning. The mounting slider 301 is a protruding component on the cleaning brush 3, its shape and size matching the slide groove 104. The function of the mounting slider 301 is to allow the cleaning brush 3 to move smoothly and steadily along the slide groove 104, while limiting its freedom of movement in non-cleaning directions, ensuring the stability and effectiveness of the cleaning action. The sliding installation allows the cleaning brush 3 to cover the entire surface of the electrostatic electret filter 2. By sliding the mounting slider 301 within the slide groove 104, the cleaning brush 3 can reciprocate, thus thoroughly cleaning the electrostatic electret filter 2. When the cleaning brush 3 slides within the slide groove 104, its bristles 302 generate relative movement with the surface of the electrostatic electret filter 2, peeling off the hair adhering to the filter through physical friction and scraping. The shaved hair is collected to keep the filter clean.

[0035] In this embodiment, the cumulative count update logic of the counting unit satisfies: ; ; This cumulative count update logic is the core mechanism for achieving steady-state transitions. Here, t is the index of the discrete sampling time. For example, if control module 14 samples and processes the differential pressure signal at regular intervals, t is the index of that sampling sequence; P t This represents the real-time differential pressure signal value collected at the current sampling time t, which is the basis for the system to make state judgments; S is the current discrete operating state, such as stationary, low power, high power, etc.; S→S+1 indicates the positive jump direction, that is, the direction in which the system expects to jump from the current state S to the next higher state S+1, which usually corresponds to the situation of increased differential pressure and increased filter clogging; S+1→S indicates the negative jump direction, that is, the direction in which the system expects to jump from state S+1 to the current state S, which usually corresponds to the situation of decreased differential pressure and filter cleaning or replacement; C up (t) and C down (t) represents the forward cumulative count and the reverse cumulative count at time t, respectively.

[0036] Specifically, the positive cumulative count value C up The update logic for (t) is as follows: if the current real-time differential pressure signal P t The upper threshold H of the positive jump is greater than up (S→S+1), and the reverse cumulative count value C down If (t-1) is zero, then the positive cumulative count value C up (t) at the previous time Cup The key is to add 1 to (t-1). The crucial point here is the condition "C_down(t-1)=0", which ensures that the forward count is not erroneously accumulated before the reverse counting trend is completely eliminated. This avoids simultaneous accumulation or frequent switching of the forward and reverse counters when the signal fluctuates near the threshold. Conversely, if the real-time differential pressure signal P... t The lower threshold H for reverse jump is less than or equal to down (S+1→S), then the positive cumulative count value C up (t) is reset to zero, which means that the current signal trend no longer supports a positive jump, and any previous positive cumulative counts should be cleared.

[0037] Similarly, the reverse cumulative count value C down The update logic for (t) is as follows: if the current real-time differential pressure signal P t The lower threshold H for reverse jump down (S+1→S), and the positive cumulative count value C up If (t-1) is zero, then the reverse cumulative count value C down (t) at the previous time C down Add 1 to (t-1). Here, "C" up The condition (t-1)=0 is equally important; it prevents the erroneous accumulation of reverse counts before the positive counting trend has been completely eliminated. If the real-time differential pressure signal P... t Greater than or equal to the upper threshold H of the positive jump up (S→S+1), then the reverse cumulative count value C down The value (t) is reset to zero, indicating that the current signal trend no longer supports a reverse transition, and the previous reverse cumulative count should be cleared. Thus, this embodiment introduces a refined cumulative count update logic. This logic effectively avoids frequent counter jumps when the real-time differential pressure signal fluctuates near the threshold by requiring the reverse counter to be zero when counting forward crossing events and the forward counter to be zero when counting reverse crossing events. Furthermore, when the signal clearly crosses the threshold in the opposite direction, the corresponding counter is immediately cleared to zero, ensuring that only a continuous and stable signal trend can drive the cumulative count and trigger a state transition. This mechanism significantly enhances the robustness and stability of state transitions, avoiding misjudgments and frequent system switching caused by instantaneous signal fluctuations, thereby improving the operational reliability and user experience of the air purifier system.

[0038] In this embodiment, the upper threshold The value is set to 1.1 to 1.3 times the nominal pressure difference for the corresponding state transition. Setting it to 1.1 to 1.3 times the nominal pressure difference for the corresponding state transition provides the system with a judgment standard that is effective in identifying filter blockage or increased operating load without being overly aggressive. In practical applications, the nominal pressure difference value corresponding to each state transition direction (S→S+1) can be pre-stored in the memory of the control module 14 or calculated through the system's self-learning and calibration program. For example, it can be calibrated using actual operating data at different filter life stages and different airflow rates. Subsequently, multiplying the nominal pressure difference value by a coefficient of 1.1 to 1.3 allows for dynamic or static determination of the specific upper threshold. This range allows for flexible adjustment based on the specific design goals and application scenarios of the air purifier system. For example, for scenarios requiring rapid response to filter blockage, a lower multiple (such as 1.1 times) can be selected, while for scenarios that prioritize system operational stability, a higher multiple (such as 1.3 times) can be selected.

[0039] lower threshold The value of is set to 0.8 to 0.9 times the nominal differential pressure at the corresponding state transition. This, together with the upper threshold H_up, forms an asymmetric hysteresis interval. This asymmetry ensures that the system does not immediately jump back to the previous state when the differential pressure signal decreases, effectively avoiding frequent and unnecessary state switching when the differential pressure signal fluctuates slightly around the threshold. up The determination method is similar. The nominal differential pressure value corresponding to each state transition direction (S+1→S) can be preset in the memory of the control module 14 or calculated through a calibration program. Then, multiplying this nominal differential pressure value by a coefficient of 0.8 to 0.9 yields the specific lower threshold. This range also provides flexibility; for example, 0.8 times can provide a faster reverse response, while 0.9 times provides higher reverse transition stability.

[0040] Integral window With Integral Window The value ranges from 5 to 30 samples. Integration window W integrate The number of consecutive samplings required for the real-time differential pressure signal to meet the threshold crossing condition is defined before the corresponding state transition command can be triggered. This integral window mechanism is designed to prevent system misjudgment caused by transient interference, short-term differential pressure fluctuations, or sensor noise. In the memory of control module 14, an integral window value can be preset for each state transition direction (including forward transition S→S+1 and reverse transition S+1→S). This value indicates that within a continuous sampling period, the differential pressure signal must continuously meet the threshold crossing condition (e.g., 5 to 30 consecutive samples must be above the upper threshold H). up or below the lower threshold H downThe accumulated value of the counting unit must reach the preset integration window value before the integration window can be reached. For example, if the differential pressure module samples at a frequency of 1Hz and the integration window is set to 10, it means that the differential pressure signal needs to continuously meet the transition condition for 10 seconds before the state transition will be executed. This range of 5 to 30 samples allows for a fine-grained trade-off between the system's anti-interference capability and response speed based on the actual application scenario. A smaller window value (such as 5 samples) makes the system more sensitive to changes in differential pressure and responds faster, but may be more sensitive to environmental noise or instantaneous airflow fluctuations; while a larger window value (such as 30 samples) makes the system more stable and has stronger anti-interference capability, but the response to actual filter clogging or cleaning will be relatively slower.

[0041] This embodiment uses an upper threshold. and lower threshold By defining specific limits, a reasonable and effective asymmetric hysteresis interval was constructed. This interval effectively avoids interference with the real-time differential pressure signal P. t When there are small fluctuations around the threshold, control module 14 frequently switches between two discrete operating states, thereby significantly improving the operational stability of the control system. Simultaneously, by defining the integral window... With Integral Window The range of values ​​further enhances the system's robustness to instantaneous disturbances, short-term differential pressure fluctuations, and sensor noise. Only when the differential pressure signal continuously and stably meets the jump condition, and the continuous cumulative count reaches the preset integration window W... integrate The status transition command is only triggered at specific times, avoiding misjudgments and unnecessary fan 9 power adjustment or maintenance alarms caused by accidental factors. This mechanism, which combines a precisely set asymmetric hysteresis threshold and an integral counter, enables the air purifier system to more accurately and stably determine the actual degree of clogging of the electrostatic electret filter 2 in the purification module and the system's operating load. This not only enables more precise fan 9 power adjustment, ensuring continuous and efficient purification, but also provides more reliable maintenance reminders, extends the lifespan of the filter and equipment, optimizes the user experience, and reduces the inconvenience caused by misjudgments.

[0042] In this embodiment, the discrete operating states include a static state S0, a low-power state S1, a high-power state S2, and a shutdown alarm state S3. State transition commands include: increasing the power of the fan 9 in the purification module or issuing a filter cleaning alarm when a positive transition is triggered; decreasing the power of the fan 9 or deactivating the alarm when a reverse transition is triggered; and cutting off the operation of the fan 9 and issuing a filter replacement alarm when entering the shutdown alarm state S3. Specifically, the setting of discrete operating states provides a clear division of working modes for the air purifier system. The static state S0 corresponds to the system being in standby or off state, where the fan 9 is not running or is running at very low power, and the differential pressure signal is close to the reference value. The low-power state S1 corresponds to the system operating at a lower fan 9 power, suitable for lightly polluted environments or scenarios requiring quiet operation, where the purification efficiency is moderate and energy consumption and noise are low. The high-power state S2 corresponds to the system operating at a higher fan 9 power, suitable for heavily polluted environments or scenarios requiring rapid purification, where the purification efficiency is higher, but energy consumption and noise also increase accordingly. The shutdown alarm state S3 corresponds to the system stopping operation and issuing an alarm due to the detection of a serious abnormality (such as severe filter blockage, equipment failure, etc.), aiming to protect the equipment and prompt the user to intervene. These state definitions allow the control module 14 to clearly classify and manage the system operating modes based on changes in the real-time differential pressure signal, thereby achieving refined control of the air purification process. Simultaneously, the state transition command is a specific operation performed by the control module 14 on the purification module based on the accumulated results of the integrator counter. When the system triggers a positive transition, the corresponding real-time differential pressure signal continuously increases, indicating increased filter resistance or worsening air pollution. At this time, the control module 14 will increase the power of the fan 9 of the purification module to maintain or improve purification efficiency; or, if the differential pressure reaches a certain level, the system will output a filter cleaning alarm, prompting the user to clean the filter. When the system triggers a reverse transition, the corresponding real-time differential pressure signal continuously decreases, indicating reduced filter resistance (e.g., after the filter has been cleaned) or reduced air pollution. At this time, control module 14 will reduce the power of fan 9 to save energy and reduce noise; or, if a filter cleaning alarm existed previously, the system will clear the alarm. Specifically, when the system enters the shutdown alarm state S3, for example, when the differential pressure signal is abnormally high and reaches a preset severe blockage threshold, or when the system detects other serious faults, control module 14 will shut down the operation of fan 9 to prevent equipment damage and output a filter replacement alarm, clearly reminding the user that the filter needs to be replaced.

[0043] In this embodiment, the control module 14 further includes a memory and a processor. The memory stores a computer program. The memory and processor configured in the control module 14 are the hardware foundation for implementing the above-mentioned control logic. The processor is responsible for executing the preset computer program in the memory, performing data processing, logical judgment, and instruction output, etc. The memory is used to store the computer program and various operating parameters (such as threshold H). up H down Integral window W integrate This configuration includes real-time data acquisition and the current value of counters. This allows complex control strategies to be flexibly implemented and updated in software.

[0044] When a computer program is executed by a processor, it performs the following steps: Collect real-time pressure difference signals before and after the filter. ; Based on the current discrete operating state of the state machine Given the desired jump direction, query the corresponding asymmetric hysteresis threshold. The asymmetric hysteresis threshold includes the upper threshold. With lower threshold ,and ; Real-time differential pressure signal With upper threshold and lower threshold Perform a comparison and adjust the forward traversal event counter based on the comparison results. Or reverse travel event counter Perform continuous cumulative counting, and reset the corresponding counter to zero when a reverse crossover occurs; Determine the forward travel event counter Or reverse travel event counter Has the accumulated value reached the preset points window? ; If the points window is reached If this occurs, the corresponding state jump instruction will be triggered, executing the power adjustment or maintenance alarm action for fan 9, and the positive crossover event counter will be updated. With the reverse travel event counter Set to zero synchronously.

[0045] More specifically, the operation process of this control module is as follows: During operation, the processor first collects the real-time differential pressure signal P before and after the filter. t The process involves connecting to the signal interface of the differential pressure module, receiving its output analog or digital signal, and converting it into a digital quantity that can be processed by a processor via an analog-to-digital converter (ADC). The real-time differential pressure signal P... t It is a key input for judging the degree of filter clogging and the system operating status.

[0046] Subsequently, the processor, based on the current discrete operating state S of the state machine and the desired transition direction, retrieves the corresponding asymmetric hysteresis thresholds from memory. These thresholds H up and H down These are pre-set and stored, and they have different values ​​for different state transition directions (e.g., from low power to high power, or from high power to low power), and the upper threshold H... up Always greater than the lower threshold H down This provides hysteresis characteristics. This query mechanism ensures that the system can apply the most appropriate judgment criteria under different operating scenarios.

[0047] Next, the processor will transmit the real-time differential pressure signal P t Compared with the upper threshold H found in the query up and lower threshold H down Perform a comparison. The comparison result is used to determine whether the differential pressure signal crosses the upper threshold (indicating worsening filter clogging) or crosses the lower threshold (indicating reduced or restored filter clogging).

[0048] Based on the comparison results, the processor adjusts the forward traverse event counter C. up Or reverse travel event counter C down Perform continuous cumulative counting. For example, P t consistently higher than H up Then C up It will continue to increase; if P t Persistently below H down Then C down This will continue to increase. Meanwhile, to ensure the accuracy of the count and the rigor of the logic, when a reverse crossover event occurs (e.g., in C...), up During accumulation, P t Suddenly dropped to H down The following is the corresponding counter (C in this example). up The value will be immediately set to zero to avoid the accumulation of errors.

[0049] In each sampling period, the processor determines the forward crossover event counter C. up Or reverse travel event counter C down Has the accumulated value reached the preset integration window W? integrate Integral window W integrate The number of times the differential pressure signal needs to be continuously sampled outside the threshold is defined to confirm that this is a stable and real trend change, rather than an instantaneous fluctuation.

[0050] If the accumulated value of any counter reaches the integration window W integrate Then the processor will trigger the corresponding state transition instruction. For example, if Cup Reaching W integrate This may trigger a command to increase the power of fan 9 or an output filter cleaning alarm; if C down Reaching W integrate This may trigger a command to reduce the power of wind turbine 9 or clear the alarm. After executing the corresponding action, the processor will update the positive pass-through event counter C. up With the reverse travel event counter C down The state is simultaneously reset to zero to prepare for the next state check.

[0051] The air purifier system disclosed in this invention can perform accurate, stable, and reliable state judgment and switching when faced with real-time differential pressure signal fluctuations. This effectively avoids misjudgments and frequent state switching caused by instantaneous signal interference or brief fluctuations, thereby improving system operational stability, extending equipment lifespan, and ensuring continuous optimization of purification efficiency. Furthermore, the clearly defined steps facilitate system debugging, maintenance, and functional upgrades.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An air purifier system, characterized in that, include: The casing has an air inlet on its side wall and an air outlet on its top surface; The purification module, disposed within the housing, includes at least a fan for guiding airflow and an electrostatic electret filter for actively capturing and filtering hair. A differential pressure module is installed in the airflow path of the purification module and is used at least to collect real-time differential pressure signals before and after the electrostatic electret filter. The control module is signal-connected to the differential pressure module and the purification module; The control module is equipped with at least a state machine, which is used to define multiple discrete operating states and state transition directions; The control module configures an asymmetric hysteresis threshold for each state transition direction. The asymmetric hysteresis threshold includes an upper threshold. With lower threshold ,and ; The control module is also equipped with an integral counter, which is used to accumulate counts when the real-time differential pressure signal crosses the upper threshold or the lower threshold, and to accumulate counts until a preset integral window is reached. The corresponding state transition instruction is triggered at that time.

2. The air purifier system according to claim 1, characterized in that: The state machine includes a state unit and a discrimination unit, and the integral counter includes a counting unit and an execution unit. The state unit is signal-connected to the counting unit through the discrimination unit, and the counting unit is signal-connected to the execution unit for coordinated execution of state transitions. The state unit maintains the current discrete operating state and the expected jump direction; The discrimination unit receives the real-time differential pressure signal and compares it with the upper threshold H corresponding to the current state. up and the lower threshold H down Perform a comparison; The counting unit continuously accumulates and counts forward crossing events or reverse crossing events based on the comparison results of the discrimination unit. The execution unit reaches the integral window W when the accumulated value of the counting unit reaches the integral window. integrate When this occurs, a status jump command is output to adjust the operating power of the fan in the purification module and / or trigger a maintenance alarm.

3. The air purifier system according to claim 1, characterized in that: The purification module also includes a fine filter, a partition plate, and a positioning ring; the side wall of the housing has multiple air inlets to form an annular air inlet structure, and the electrostatic electret filter is installed on the inner wall of the housing. The number of electrostatic electret filters is the same as the number of air inlets and their positions correspond one-to-one. The fine filter screen is installed inside the housing and coaxially arranged with the housing. The fine filter screen has a hollow cylindrical structure. The partition plate has a radially closed annular structure. The partition plate is pressed against the top surface of the fine filter screen, and the outer edge of the partition plate is attached to the inner wall of the housing. The partition plate is provided with a clearance groove corresponding to the position of the electrostatic electret filter screen. The positioning ring is located in the inner ring of the annular structure of the partition plate. The positioning ring is inserted and engaged with the inner wall of the hollow cavity of the fine filter screen to achieve radial and axial positioning of the fine filter screen.

4. An air purifier system according to claim 3, characterized in that: The differential pressure module includes a pressure port group and a miniature differential pressure transmitter. The pressure port group includes a first pressure port, a second pressure port, and a third pressure port distributed sequentially along the gas flow direction. The first pressure port is located before the electrostatic electret filter, the second pressure port is located between the electrostatic electret filter and the fine filter, and the third pressure port is located after the fine filter. The miniature differential pressure transmitter is installed in the housing or a partition plate and is connected to the first pressure port, the second pressure port, and the third pressure port, respectively. It is used to calculate the first differential pressure between the first pressure port and the second pressure port, and the second differential pressure between the second pressure port and the third pressure port, and outputs the first differential pressure and the second differential pressure as the real-time differential pressure signal to the control module.

5. An air purifier system according to claim 3, characterized in that: The purification module also includes an ultraviolet lamp and an air fragrance. The fan is installed inside the cylinder and located near the air outlet. The ultraviolet lamp is located in the hollow cavity of the fine filter. The air fragrance is detachably installed on the top surface of the partition plate and located between the partition plate and the fan.

6. An air purifier system according to claim 5, characterized in that: The purification module also includes a cleaning brush. The inner wall of the housing is provided with a mounting slot for installing an electrostatic electret filter. Each of the air inlets has a mounting slot on each of its two lateral sides. The electrostatic electret filter is slidably installed on the inner wall of the housing through the mounting slot, and after installation, the electrostatic electret filter is attached to the corresponding air inlet. Each of the air inlets has a sliding groove on each of its two sides. The two ends of the cleaning brush are provided with mounting sliders that slide in cooperation with the sliding grooves. The cleaning brush is slidably installed on the air inlet through the mounting sliders. In the installed state, the bristles of the cleaning brush are attached to the outer surface of the electrostatic electret filter, and are used to scrape off the attached hair when the electrostatic electret filter and the cleaning brush move relative to each other.

7. An air purifier system according to claim 2, characterized in that: The cumulative count update logic of the counting unit satisfies: ； ； Where t is the index of the discrete sampling time, P t Let C be the real-time differential pressure signal value at time t, S be the current discrete operating state, S→S+1 represents the forward jump direction, and S+1→S represents the reverse jump direction. up (t) and C down (t) represents the forward cumulative count and the reverse cumulative count at time t, respectively.

8. An air purifier system according to claim 7, characterized in that: The upper threshold The value is 1.1 to 1.3 times the nominal pressure difference corresponding to the state transition, and the lower threshold is... The value is 0.8 to 0.9 times the nominal differential pressure corresponding to the state transition; The integration window With the integration window The value ranges from 5 to 30 samples.

9. An air purifier system according to claim 8, characterized in that: The discrete operating states include a static state S0, a low-power state S1, a high-power state S2, and a shutdown alarm state S3. The state transition instructions include: increasing the fan power of the purification module or outputting a filter cleaning alarm when a positive transition is triggered; reducing the fan power or deactivating the alarm when a reverse transition is triggered; and cutting off the fan operation and outputting a filter replacement alarm when entering the shutdown alarm state S3.

10. An air purifier system according to claim 9, characterized in that, The control module further includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, performs the following steps: Collect real-time pressure difference signals before and after the filter. ; Based on the current discrete operating state of the state machine Given the desired jump direction, query the corresponding asymmetric hysteresis threshold, whereby the asymmetric hysteresis threshold includes an upper threshold. With lower threshold ,and ; The real-time differential pressure signal With the upper threshold and the lower threshold Perform a comparison and adjust the forward traversal event counter based on the comparison results. Or reverse travel event counter Perform continuous cumulative counting, and reset the corresponding counter to zero when a reverse crossover occurs; Determine the forward traversal event counter or the reverse travel event counter Has the accumulated value reached the preset points window? ; If the integration window is reached If the corresponding state transition command is triggered, the wind turbine power adjustment or maintenance alarm action will be executed, and the forward pass event counter will be updated. With the reverse traversal event counter Set to zero synchronously.

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