Pressure cylinder pneumatic control system and intelligent water purifier

Abstract

This application provides a pressure tank pneumatic control system and an intelligent water purifier, specifically relating to the field of fluid pressure control technology. The system includes: a pressure tank body, internally divided into a purified water chamber and an air chamber by a diaphragm; the purified water chamber is connected to the inlet and outlet via a first pipe, and the air chamber is connected to the air supply port via a second pipe; a pressure detection device, located on the first pipe, for detecting real-time pressure data; an inflation actuator, located on the second pipe, for controlled inflation of the air chamber; and a control device electrically connected to both the pressure detection device and the inflation actuator. The control device is configured to: activate the inflation actuator to inflate the air chamber when the real-time pressure data is below the lower limit of the target pressure range; and stop the inflation actuator from inflating the air chamber after a first preset time interval from when the real-time pressure data enters a preset buffer zone. The preset buffer zone is located within the target pressure range and adjacent to its upper limit. This application solves the problems of repeated start-stop cycles, insufficient inflation, or apparent over-inflation.

Description

Technical Field

[0001] This application relates to the field of fluid pressure control technology, and in particular to a pressure tank pneumatic control system and an intelligent water purifier. Background Technology

[0002] In water treatment equipment such as water purifiers, diaphragm pressure tanks are widely used to store purified water and maintain system pressure. The pressure tank's interior is divided into a purified water chamber and an air chamber by a diaphragm. The air chamber is pre-filled with pressurized gas to provide the driving force for discharging the purified water. With long-term operation, the gas in the air chamber will inevitably leak slowly, causing the internal pressure to gradually decrease. This directly affects the effective water storage capacity and output capacity of the pressure tank, leading to frequent start-ups and shutdowns of the water purifier and reduced water flow. Therefore, pressure monitoring and air replenishment maintenance of the pressure tank's air chamber are necessary.

[0003] To address this issue, existing technologies have developed control systems capable of automatically inflating pressure tanks. These systems typically utilize pressure sensors to monitor the pressure in the tank in real time, activating an air pump or other inflation device when the detected pressure falls below a preset lower limit, and stopping inflation when the pressure rises to a preset upper limit. However, in practical applications, due to signal fluctuations in pressure sensors, mechanical inertia during air pump shutdown, and response delays in the control loop, a simple threshold-triggered shutdown method can easily lead to repeated start-stop cycles of the air pump near the shutdown threshold. This not only generates noise and affects device lifespan but also makes it difficult for the actual pressure after inflation stops to consistently fall within the preset target operating range, resulting in over-inflation or under-inflation, thus impacting the normal use of the pressure tank and the diaphragm's lifespan. Summary of the Invention

[0004] To address at least one of the shortcomings of the prior art, this application provides a pressure tank pneumatic control system, comprising: The pressure tank body is divided into a water purification chamber and an air chamber by a diaphragm; the water purification chamber is connected to the inlet and outlet via a first pipe, and the air chamber is connected to the air supply port via a second pipe. A pressure detection device is installed on the first pipeline to detect real-time pressure data; An inflation actuator, disposed on the second pipeline, is used to controllably inflate or stop inflating the air cavity; A control device is electrically connected to the pressure detection device and the inflation execution component, respectively. The control device is configured to: when the real-time pressure data is lower than the lower limit of the target pressure range, start the inflation execution component to inflate the air cavity; after a first preset time period from when the real-time pressure data enters the preset buffer zone, stop the inflation execution component from inflating the air cavity, wherein the preset buffer zone is located within the target pressure range and adjacent to its upper limit.

[0005] Optionally, the control device is further configured to generate a warning signal when the real-time pressure data is between the lower limit of the target pressure range and the warning pressure value; the warning pressure value is higher than the lower limit of the target pressure range and lower than the upper limit of the target pressure range.

[0006] Optionally, the pressure detection device is further configured to detect the target pressure data after a second preset time period since inflation stops; the control device is further configured to compare the target pressure data with the target pressure range to obtain the inflation verification result.

[0007] Optionally, comparing the target pressure data with the target pressure range to obtain the inflation verification result includes: If the target pressure data is lower than the lower limit of the target pressure range, then the inflation execution component is controlled to perform secondary inflation. If the target pressure data detected after the second air replenishment is still lower than the lower limit of the target pressure range, it is determined that there is a leak in the air cavity, and a leak fault alarm signal is generated.

[0008] Optionally, the control device is further configured to: When the real-time pressure data is higher than the upper limit of the target pressure range, it is determined that the inflation is excessive. A high-pressure abnormality alarm signal is generated, and the inflation actuator is locked to prevent it from starting.

[0009] Optionally, the control device is further configured to: Obtain the inflation trigger pressure value, inflation duration, and stable pressure value after inflation stops from historical inflation operations; The pressure decay trend of the air cavity is determined based on multiple sets of inflation trigger pressure values, inflation duration, and stable pressure values ​​after inflation stops. Based on the pressure decay trend, the monitoring cycle of the pressure detection device for detecting the real-time pressure data is adjusted.

[0010] Optionally, the control device is further configured to: Based on the pressure decay trend, a preventative maintenance reminder is output before the real-time pressure data approaches the lower limit of the target pressure range.

[0011] Optionally, the first preset duration is determined based on the inflation rate of the inflation actuator and the volume of the air cavity.

[0012] Optionally, the inflation actuator includes an air circuit solenoid valve and an air pump.

[0013] On the other hand, this application provides an intelligent water purifier, including a pressure tank pneumatic control system as described in any of the above aspects.

[0014] By adopting the above technical solution, this application has the following beneficial effects: This application provides a pressure tank pneumatic control system that solves the problems of repeated start-stop and pressure instability by setting the inflation shutdown condition to a delayed shutdown after entering the buffer zone, using extremely simple control logic. To address the repeated start-stop problem, a mandatory minimum inflation time is provided: once the pressure reaches the lower limit of the buffer zone, regardless of whether the pressure continues to rise, fluctuates slightly, or falls back, the system will continue to inflate for at least a fixed first preset time. This naturally eliminates the possibility of "stop-start-stop" oscillations in a very short time due to instantaneous signal jitter or a slight pressure drop at the shutdown threshold. To address the issue of pressure stability after inflation, this application changes the shutdown timing mechanism by shifting the shut-off control point from "pressure reaching a specific value" to "entering the buffer zone." The predetermined inflation volume, determined by a first preset duration, takes precedence in determining the shutdown timing. The uncertain air volume caused by the mechanical inertia delay and system response lag during pump shutdown is merely a minor disturbance following this predetermined inflation volume, and its fluctuation range is contained within the design margin of the buffer zone, no longer affecting the final stable pressure after shutdown. This ensures that the final stable pressure after shutdown is fully and reliably within the target operating range, thus resolving the problems of insufficient or seemingly over-inflated inflation in one go. This application achieves excellent control performance without requiring complex pressure stability judgment logic, resulting in lower cost and higher reliability.

[0015] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. The same reference numerals usually represent the same components. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural block diagram of the pressure tank pneumatic control system provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the pressure tank pneumatic control system provided in the embodiments of this application; Figure 3 This is a schematic flowchart of the pressure tank pneumatic control method provided in the embodiments of this application.

[0018] The following is supplementary explanation of the attached figures: 1. Pressure tank body; 2. Diaphragm; 3. Clean water chamber; 4. Air chamber; 5. Inlet and outlet; 6. Air supply port; 7. Pressure detection device; 8. Normally open manual ball valve; 9. Water circuit solenoid valve; 10. Air inflation actuator; 11. Air circuit solenoid valve; 12. Air pump; 13. Control device. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] The term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. In the description of this application, it should be understood that the terms "upper," "lower," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., 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 so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0021] refer to Figure 1-2 This application provides a pressure tank pneumatic control system, comprising: The pressure tank body 1 is internally divided into a purified water chamber 3 and an air chamber 4 by a diaphragm 2. The purified water chamber 3 is connected to the inlet / outlet 5 via a first pipe, and the air chamber 4 is connected to the air supply port 6 via a second pipe. Specifically, the diaphragm 2 is an arc-shaped diaphragm that divides the internal space of the pressure tank body 1 into upper and lower chambers. The upper chamber is the purified water chamber 3, and the lower chamber is the air chamber 4. The purified water chamber 3 is used to store purified water produced by the water purifier, and the air chamber 4 is used to fill with gas at a preset pressure to provide the driving force for pushing the purified water out of the purified water chamber 3 through the inlet / outlet 5.

[0022] A pressure detection device 7, installed on the first pipeline, is used to detect real-time pressure data. The installation of the pressure detection device 7 on the first pipeline ensures that it actually detects the water pressure within the purified water chamber 3. Since the pressure in the air chamber 4 of the diaphragm pressure tank is equal to the pressure in the purified water chamber 3 under static equilibrium, detecting the water pressure indirectly reflects the pressure in the air chamber 4. Specifically, the pressure detection device 7 can be an electronic pressure gauge, used to continuously collect or collect real-time pressure data from the first pipeline according to a preset monitoring cycle. This real-time pressure data reflects the pressure state within the air chamber 4. The pressure detection device 7 transmits the collected real-time pressure data to the control device 13, which then executes corresponding control logic based on the real-time pressure data.

[0023] In practice, the diaphragm 2 is a flexible arc-shaped diaphragm, its periphery sealed and fixed to the inner wall of the pressure tank body 1, sealingly dividing the internal space of the pressure tank body 1 into two non-communicating chambers. When the water volume in the purified water chamber 3 increases, the diaphragm 2 arches and deforms towards the air chamber 4, reducing the volume of the air chamber 4 and increasing the air pressure. When the purified water in the purified water chamber 3 flows out through the inlet / outlet 5, the air pressure in the air chamber 4 pushes the diaphragm 2 back to the purified water chamber 3, continuously pressurizing the purified water out, thereby ensuring stable outlet water pressure. Since the diaphragm 2 is a flexible component, the pressure on both sides remains balanced under steady state. Therefore, the pressure of the purified water in the first pipeline corresponds to the air pressure in the air chamber 4, and the pressure state of the air chamber 4 can be indirectly obtained by detecting the water pressure in the first pipeline.

[0024] The first pipeline is also equipped with a normally open manual ball valve 8 and a water circuit solenoid valve 9 in sequence. The normally open manual ball valve 8 is located on the first pipeline and is used to manually shut off the first pipeline during inspection or maintenance, facilitating the disassembly and replacement of the pressure tank or pipeline components. The water circuit solenoid valve 9 is located on the first pipeline and is electrically connected to the control device 13, used to controllably open or close the first pipeline to achieve automatic control of the water output from the water purifier.

[0025] An inflation actuator 10, disposed on the second pipeline, is used to controllably inflate or stop inflation in the air chamber 4. The inflation actuator 10 includes a pneumatic solenoid valve 11 and an air pump 12. Specifically, the pneumatic solenoid valve 11 and the air pump 12 are connected in series on the second pipeline. The air pump 12 generates compressed gas and provides inflation power, while the pneumatic solenoid valve 11 controls the opening or closing of the second air passage. When inflation is required, the control device 13 simultaneously starts the air pump 12 and opens the pneumatic solenoid valve 11, allowing compressed gas to enter the air chamber 4 through the air inlet 6. When inflation needs to be stopped, the control device 13 shuts off the air pump 12 and closes the pneumatic solenoid valve 11 to prevent gas in the air chamber 4 from leaking back through the second air passage.

[0026] In one embodiment, the air pump 12 is a miniature air pump integrated inside the water purifier, directly driven by the control device 13, thereby achieving fully automatic inflation without manual intervention from the user. In another embodiment, the air pump 12 is an external air pump. When the control device 13 determines that inflation is needed, it can send a prompt message to the user terminal through indicator lights, screen text display, or communication module, prompting the user to connect the external air pump. The control device 13 then controls the external air pump to complete the automatic inflation, adapting to different product configurations and usage scenarios.

[0027] Specifically, a simple yet fully functional inflation actuator is constructed by combining a solenoid valve and an air pump in series. The air pump provides the inflation power, while the solenoid valve controls the opening and closing of the air path. Together, they achieve precise inflation control. Simultaneously, the dual shut-off mechanism of the air pump stopping and the solenoid valve closing effectively prevents reverse gas leakage from the air chamber, ensuring stable pressure maintenance. This combined solution is simple in structure, low in cost, and reliable in control, making it easy to integrate into small devices such as water purifiers.

[0028] The control device 13 is electrically connected to the pressure detection device 7 and the inflation execution component 10, respectively. The control device 13 is configured to: activate the inflation execution component 10 to inflate the air chamber 4 when the real-time pressure data is lower than the lower limit of the target pressure range; and stop inflating the air chamber 4 after a first preset time period from when the real-time pressure data enters the preset buffer zone. The preset buffer zone is located within the target pressure range and adjacent to its upper limit. The control device 13 can be a power board integrated into the water purifier or a separately set control circuit board. The target pressure range has a lower limit and an upper limit. The lower limit is the minimum working pressure that ensures the pressure tank has a basic effective water storage capacity, and the upper limit is the maximum permissible pressure that does not affect the normal water production of the water purifier and does not pose a risk to the system. By maintaining the pressure in the air chamber 4 within the target pressure range, it can be ensured that the pressure tank always has sufficient effective water storage capacity and stable water output capability.

[0029] The preset buffer zone is a sub-zone that falls entirely within the target pressure range, with its upper limit not exceeding the upper limit of the target pressure range and its lower limit not falling below the upper limit of the target pressure range minus a preset pressure difference. In practice, the upper limit of the preset buffer zone is equal to the upper limit of the target pressure range, and the lower limit is 90% to 95% of the upper limit of the target pressure range. In other words, the preset buffer zone is a pressure range within the target pressure range closest to its upper limit. By setting the buffer zone to the upper limit of the adjacent target pressure range, the stable pressure after inflation can reliably fall within the upper region of the target pressure range, ensuring the pressure tank has sufficient effective water storage capacity, while also reserving sufficient pressure margin for pump shutdown inertia and system response lag.

[0030] The first preset duration is determined based on the inflation rate of the inflation actuator 10 and the volume of the air chamber 4. Specifically, the first preset duration can be determined according to the formula t = ΔV / Q, where t is the first preset duration, ΔV is the change in volume of the air chamber 4 corresponding to the preset buffer zone, and Q is the inflation rate of the inflation actuator 10. The change in volume ΔV corresponding to the preset buffer zone is determined by the total volume of the air chamber 4 and the pressure range between the preset buffer zones. By determining the first preset duration in this way, it can be ensured that the amount of gas injected within the first preset duration is just enough to raise the pressure from the lower limit of the buffer zone to near the upper limit of the target pressure range, thereby achieving precise inflation control and avoiding under-inflation or over-inflation.

[0031] Specifically, based on the nominal flow rate of the air pump 12 in the inflation actuator 10 and the pipeline resistance characteristics of the second pipeline, the actual inflation rate of the inflation actuator 10 into the air chamber 4 is determined, i.e., the volume of gas injected into the air chamber 4 per unit time. Based on the pressure range of the preset buffer zone and the effective volume of the air chamber 4, the amount of gas required to raise the pressure in the air chamber 4 from the lower limit of the buffer zone to the upper limit of the target pressure range is calculated. This gas volume is divided by the actual inflation rate to obtain the theoretical inflation time, and the first preset time is set based on this theoretical inflation time. In practical applications, the first preset time can be slightly less than the theoretical inflation time to allow for the amount of gas that continues to be injected after the air pump 12 is turned off due to mechanical inertia and the delayed closing of the solenoid valve 11, ensuring that the stable pressure after inflation stops is exactly in the upper middle part of the target pressure range. By determining the first preset time based on the inflation rate and the air chamber volume, the coordination accuracy between the buffer zone and the delayed shutdown can be guaranteed, ensuring that the final stable pressure after inflation stops reliably falls within the target pressure range.

[0032] Specifically, by linking the first preset duration with the inflation rate and air chamber volume, a scientific basis for determining the parameters of the delay-off mechanism is provided. This ensures that the delay duration precisely corresponds to the pressure range within the buffer zone, guaranteeing that the amount of gas injected within the first preset duration is just enough to raise the pressure from the lower limit of the buffer zone to the ideal position within the target pressure range. This parameter determination method makes the control effect predictable and reproducible, facilitating rapid adaptation and optimization for different specifications of pressure tanks and inflation devices, and significantly reducing product debugging costs.

[0033] Specifically, during the inflation actuator 10 inflating the air chamber 4, the pressure detection device 7 continuously monitors the real-time pressure data and feeds it back to the control device 13 in real time. When the real-time pressure data rises to the preset buffer zone, the control device 13 starts a timer, and after a first preset time, controls the inflation actuator 10 to stop inflation. The preset buffer zone is located within the target pressure range and is close to its upper limit; that is, the lower limit of the preset buffer zone is lower than the upper limit of the target pressure range, and the upper limit of the preset buffer zone is lower than or equal to the upper limit of the target pressure range. By setting a delay shutdown mechanism for the first preset time, overcharging problems caused by mechanical inertia of the air pump shutdown and system response delay can be avoided, and the inflation actuator 10 can be prevented from repeatedly starting and stopping near the pressure threshold, thus improving the stability of inflation control and the lifespan of the device.

[0034] The control device 13 is also configured to: during the inflation process of the first preset duration, if the real-time pressure data exceeds the upper limit of the target pressure range, determine that the inflation is excessive; generate a high-pressure abnormality alarm signal; and lock the inflation actuator 10 to prevent it from starting. The high-pressure abnormality alarm signal can be output in various forms, such as a buzzer sounding, an indicator light flashing, a display screen prompting, or sending a message to the user terminal, to alert the user that the system pressure is abnormal and that timely pressure relief is necessary. After locking the inflation actuator 10, the system will no longer respond to any inflation trigger commands until the abnormality is resolved and a manual reset is performed, thereby effectively ensuring the safe operation of the system and avoiding diaphragm damage or other safety risks caused by continuous over-inflation.

[0035] In practice, once the high-pressure anomaly is resolved, the locking of the inflation actuator 10 can be released through a manual reset operation, allowing the system to return to normal operation. The manual reset operation can be performed by pressing the reset button, sending a reset command via the user terminal, or powering off and restarting the system. This ensures that the inflation function is only reactivated after safety has been confirmed, preventing accidental inflation attempts that could lead to safety risks if the fault has not been resolved.

[0036] Specifically, during the inflation process of the first preset duration, the control device 13 continuously monitors the real-time pressure data. If the real-time pressure data exceeds the upper limit of the target pressure range before the first preset duration expires, the control device 13 immediately terminates inflation and determines that the inflation is excessive. This situation is usually caused by the failure of the air circuit solenoid valve 11 of the inflation actuator 10 to close, abnormal control signals, or calibration deviations of the pressure detection device 7. After determining that the inflation is excessive, the control device 13 generates a high-pressure abnormality alarm signal, which is output in the form of a prominent audible and visual alarm to remind the user that the system is in an abnormally high-pressure state. At the same time, the control device 13 performs a locking operation on the inflation actuator 10. That is, in the locked state, regardless of whether the real-time pressure data is lower than the lower limit of the target pressure range, the inflation actuator 10 is prohibited from starting, thereby preventing the safety risk of the pressure in the air chamber 4 further increasing due to continuous inflation, which could endanger the life of the diaphragm 2 or even damage the pressure tank body 1. The locked state must be manually reset by the user after troubleshooting to ensure safety. Through the aforementioned high-pressure anomaly protection mechanism, the system can monitor pressure anomalies in real time during the inflation process, and achieve automatic shutdown and fault locking in case of overpressure, thus ensuring the safe operation of the equipment.

[0037] Specifically, when the pressure exceeds the upper limit, not only is a high-pressure anomaly alarm generated, but the inflation actuator is also actively locked to prevent its activation, fundamentally eliminating the risk of continuous overcharging due to accidental inflation triggering in fault conditions. This effectively prevents serious consequences such as diaphragm rupture and barrel deformation caused by extreme situations such as pressure sensor failure, control logic abnormalities, or device failure, significantly improving the system's safety level.

[0038] Specifically, in this embodiment, by setting the inflation shutdown condition to "delay for a first preset duration after entering the preset buffer zone before shutting down," the system overcomes the two major technical challenges of repeated start-stop and unstable pressure in the prior art with extremely simple control logic. Regarding the repeated start-stop problem, this solution provides a mandatory minimum inflation duration: once the pressure reaches the lower limit of the buffer zone, regardless of whether the pressure continues to rise, fluctuates slightly, or briefly drops, the system will continue to inflate for at least another fixed duration, thus completely eliminating the possibility of "stop-start-stop" oscillations in a very short time due to signal jitter or a slight drop in pressure at the shutdown threshold. To address the issue of pressure stability after inflation, this solution moves the shut-off control point from "pressure reaching a specific value" to "entering the buffer zone," altering the mechanism for determining the shut-off timing. The predetermined inflation volume, determined by a first preset duration, takes precedence in determining the shut-off timing. The uncertain volume caused by the mechanical inertia delay and system response lag during pump shutdown serves only as a minor disturbance following this predetermined inflation volume. Its fluctuation range is contained within the design margin of the buffer zone and no longer influences the final stable pressure after shutdown. This ensures that the final stable pressure after shutdown is fully and reliably within the target operating range, thus resolving the issues of insufficient or seemingly over-inflated inflation in one go. Furthermore, it eliminates the need for complex pressure stability judgment logic, resulting in lower costs and higher reliability.

[0039] In one possible implementation, the control device 13 is further configured to generate a warning signal when the real-time pressure data is between the lower limit of the target pressure range and the warning pressure value; the warning pressure value is higher than the lower limit of the target pressure range but lower than the upper limit of the target pressure range. Specifically, the warning pressure value is slightly higher than the lower limit of the target pressure range, meaning that the lower limit of the target pressure range is less than the warning pressure value and the warning pressure value is less than the upper limit of the target pressure range. When the real-time pressure data is between the lower limit of the target pressure range and the warning pressure value, it indicates that the pressure tank pressure is at a low level but can still operate normally. At this time, the control device 13 generates a warning signal, for example, through an indicator light, a display screen, or by sending a notification to the user terminal, reminding the user that the pressure tank pressure is low and suggesting that they check and refill it soon. This warning mechanism helps users to arrange preventative maintenance in advance and prevent the pressure from dropping further to a level that affects normal use.

[0040] The warning range is defined as the area between the warning pressure value and the lower limit of the target pressure range. During real-time monitoring, the control device 13 compares the real-time pressure data with both the lower limit of the target pressure range and the warning pressure value. When the real-time pressure data is higher than the warning pressure value, it indicates that the pressure in the air chamber 4 is within the normal operating range. When the real-time pressure data drops to between the warning pressure value and the lower limit of the target pressure range, the control device 13 determines that the pressure is in a warning state and generates and outputs a warning signal. The warning signal can be output through an audible and visual indicator, such as flashing indicator lights, intermittent buzzer sounds, or a pop-up message on the display interface, to remind the user that the pressure in the air chamber 4 is too low and the inflation process is about to begin. By setting the warning range, the system can provide a warning to the user before the inflation process is officially triggered, allowing the user to monitor the working status of the pressure tank. It also provides a window for manual intervention or maintenance, improving the system's interactivity and user experience.

[0041] Specifically, in this embodiment, a three-tiered pressure state judgment mechanism—normal, warning, and requiring inflation—is constructed by setting a warning pressure value above the lower limit of the target pressure range. Compared to the single threshold judgment in existing technologies that only triggers inflation when the pressure falls below the lower limit, this embodiment issues a warning before the pressure drops to a level that affects normal use, providing users with ample time for preventative maintenance and avoiding sudden drops in water flow or frequent start-ups and shutdowns of the water purifier due to sudden pressure deficiency. This tiered warning mechanism significantly improves the user experience and the continuity of system operation by enabling preventative maintenance of the pressure tank.

[0042] In one possible implementation, the pressure detection device 7 is further configured to detect the target pressure data after a second preset time elapsed since inflation stops; the control device 13 is further configured to compare the target pressure data with the target pressure range to obtain the inflation verification result.

[0043] The process involves comparing the target pressure data with the target pressure range to obtain the inflation verification result. This includes: if the target pressure data is lower than the lower limit of the target pressure range, the inflation execution component 10 is controlled to perform secondary inflation; if the target pressure data detected after secondary inflation is still lower than the lower limit of the target pressure range, it is determined that there is a leak in the air cavity 4, and a leak fault alarm signal is generated.

[0044] Specifically, the second preset duration is the settling time after inflation stops to allow the pressure to stabilize. This is used to eliminate measurement errors caused by airflow disturbances and temperature changes during inflation, and can be preset to 10 to 30 seconds. After the settling period, the target pressure data is checked. If the target pressure data is within the target pressure range, inflation is considered successful, and the system returns to normal monitoring status. If the target pressure data is still below the lower limit of the target pressure range, the inflation execution component 10 is controlled to perform secondary air replenishment. If the target pressure data detected after secondary air replenishment is still below the lower limit of the target pressure range, a leak is detected in the air chamber 4 or the second pipeline, and a leak fault alarm signal is generated to prompt the user to perform maintenance. If the target pressure data is above the upper limit of the target pressure range, an overcharge alarm signal is generated to indicate that the system has an overcharge abnormality.

[0045] The secondary air replenishment process is the same as the initial air replenishment process. The control device 13 restarts the air replenishment execution component 10 to replenish the air chamber 4, and stops replenishment after a first preset time interval once the real-time pressure data enters the preset buffer zone. After the secondary air replenishment is completed, a second preset time interval is followed for stabilization, and the target pressure data is acquired again and compared with the target pressure range. If the target pressure data after the secondary air replenishment is still lower than the lower limit of the target pressure range, it indicates that the pressure decay rate of the air chamber 4 is abnormal, and normal pressure cannot be maintained by conventional air replenishment alone. Based on this, the control device 13 determines that there is a leakage fault in the air chamber 4 and generates a leakage fault alarm signal. The leakage fault alarm signal is different from the warning signal; it has a higher alarm level and can be output through continuous audible and visual alarms, fault notifications pushed to the user terminal, etc., to prompt the user to perform timely maintenance. Furthermore, after determining that a leakage fault exists, the control device 13 can further lock the air replenishment execution component 10, prohibiting it from continuing to start, to avoid overheating and damage to the air pump due to frequent ineffective air replenishment, and to prevent further leakage and loss of more gas. Through a two-level verification mechanism of secondary gas replenishment and leakage detection, the system can distinguish between normal pressure decay and abnormal leakage, and realize automatic fault identification and graded alarm.

[0046] Specifically, compared to existing open-loop control technologies that rely solely on real-time pressure during inflation without subsequent verification, this embodiment effectively eliminates interference from dynamic pressure fluctuations and pipeline resistance pressure drops during inflation by allowing the system to stand still for a second preset time after inflation stops before detecting and verifying the target pressure data. This ensures that the actual stable pressure after inflation is accurately reflected, guaranteeing that the inflation effect meets the expected target. This verification mechanism significantly improves the accuracy and reliability of inflation control at extremely low implementation costs. By attempting a second inflation attempt to eliminate accidental factors during a single inflation cycle, if the pressure still falls short after the second inflation attempt, a leak in the air chamber or air path is detected, generating a fault alarm. This automatically resolves minor leaks causing insufficient inflation and promptly detects serious leaks, alerting the user for maintenance. This prevents the system from continuously operating ineffectively under fault conditions, improving system reliability and safety.

[0047] In one possible implementation, the control device 13 is further configured to: acquire the inflation trigger pressure value, inflation duration, and stable pressure value after inflation stops from historical inflation operations; determine the pressure decay trend of the air chamber 4 based on multiple sets of inflation trigger pressure values, inflation duration, and stable pressure values ​​after inflation stops; adjust the monitoring cycle of the pressure detection device 7 for detecting real-time pressure data based on the pressure decay trend; and / or output a preventive maintenance reminder before the real-time pressure data approaches the lower limit of the target pressure range based on the pressure decay trend.

[0048] Specifically, the control device 13 records historical data such as the inflation trigger pressure value, inflation duration, and stable pressure value after inflation stops for each inflation operation. By analyzing multiple sets of historical data, the control device 13 can determine the pressure decay rate and pressure decay trend of the air chamber 4. Based on this pressure decay trend, the control device 13 can dynamically adjust the monitoring cycle of the pressure detection device 7, for example, shortening the monitoring cycle when the pressure decay is rapid and extending the monitoring cycle when the pressure decay is slow, so as to reduce system power consumption while ensuring timely monitoring. In addition, the control device 13 can also output preventive maintenance reminders in advance before the real-time pressure data approaches the lower limit of the target pressure range, so that users can arrange maintenance in advance and avoid affecting normal use.

[0049] In practice, after each inflation operation, the control device 13 stores the inflation trigger pressure value, inflation duration, and stable pressure value after inflation stops as a set of historical data in the storage unit. As the number of inflations increases, the control device 13 accumulates multiple sets of historical inflation data. It then performs time-series analysis on the inflation trigger pressure values ​​in each set, calculates the pressure decay rate between two adjacent inflations, and, combined with the correspondence between inflation duration and stable pressure value, fits a pressure decay trend curve for the air cavity 4. The pressure decay trend reflects the pressure drop in the air cavity 4 per unit time, and its trend indicates the degree of degradation in the sealing performance of the air cavity 4. Based on the determined pressure decay trend, the control device 13 dynamically adjusts the monitoring cycle of the pressure detection device 7: when the pressure decay trend is gentle (i.e., the pressure drops slowly), the monitoring cycle is appropriately increased to reduce system power consumption; when the pressure decay trend is steep (i.e., the pressure drops rapidly), the monitoring cycle is appropriately decreased to increase the monitoring frequency, ensuring timely detection of moments when the pressure falls below the lower limit. In addition, the control device 13 predicts when the real-time pressure data will approach the lower limit of the target pressure range based on the pressure decay trend, and outputs a preventive maintenance reminder before that moment. The preventive maintenance reminder may include suggestions such as checking the air circuit seal, replacing the seals, or contacting a professional for maintenance, so that users can perform maintenance in advance before the pressure tank shows a significant decline in function, thereby avoiding problems such as reduced water flow and frequent start-ups and shutdowns of the equipment due to insufficient pressure in the air chamber 4, and extending the service life of the pressure tank.

[0050] The control device 13 determines the pressure decay trend of the air cavity 4 as follows: For each set of historical inflation data, the difference between the current inflation trigger pressure value and the stable pressure value after the previous inflation stopped is used as the pressure decay amount during the two inflation intervals, and the time interval between the two inflation operations is used as the decay time. The average pressure decay rate during this time period is calculated. The control device 13 performs linear fitting or weighted averaging on the average pressure decay rates corresponding to multiple sets of historical inflation data to obtain a decay rate change curve reflecting the overall pressure decay trend of the air cavity 4. When the decay rate change curve shows an upward trend, it indicates that the sealing performance of the air cavity 4 is gradually deteriorating and the leakage rate is gradually increasing; when the decay rate change curve tends to be stable, it indicates that the air cavity 4 is in a stable slow leakage state. Based on the above pressure decay trend, the control device 13 adjusts the monitoring cycle of the pressure detection device 7 according to a preset mapping relationship: the larger the decay rate, the shorter the monitoring cycle, to ensure timely detection of moments when the pressure is below the lower limit; the smaller the decay rate, the longer the monitoring cycle, to reduce system power consumption. In this way, the system can adaptively adjust the monitoring frequency according to the actual sealing state of the air cavity, thereby optimizing the system's operating power consumption while ensuring the timeliness of pressure monitoring.

[0051] Specifically, in this embodiment, the monitoring cycle is adaptively and dynamically adjusted through historical data analysis and pressure decay trend learning. The monitoring cycle is shortened when pressure decay is rapid to ensure timeliness, and extended when pressure decay is slow to reduce system power consumption. This adaptive mechanism allows the system to adapt to different usage environments and pressure tanks with varying degrees of aging, maintaining a balance between monitoring accuracy and operating power consumption without requiring manual parameter setting, significantly improving its intelligence. Based on the learned pressure decay trend, preventative maintenance prompts are output in advance before the pressure approaches the lower limit, allowing users to perform maintenance at their own pace, completely avoiding interruptions caused by sudden pressure drops and greatly improving the user experience.

[0052] To facilitate understanding of the technical solution of this application, the following will be used as an example. Figure 3 Taking this example, the working process of the pressure tank pneumatic control system provided in this application embodiment will be described in detail.

[0053] S301, acquire real-time pressure data detected by pressure detection device 7. Control device 13 acquires real-time pressure data detected by pressure detection device 7 installed on the first pipeline. The first pipeline connects the water purification chamber 3 of the pressure tank body 1 to the inlet / outlet 5. Pressure detection device 7 indirectly reflects the air pressure state of air chamber 4 by detecting the water pressure in the first pipeline, thereby realizing continuous monitoring of the internal pressure of the pressure tank. Control device 13 periodically collects real-time pressure data at a preset monitoring cycle, and can dynamically adjust the monitoring cycle according to the pressure decay trend of air chamber 4 to balance monitoring timeliness and system power consumption.

[0054] S303, when the real-time pressure data is lower than the lower limit of the target pressure range, the inflation actuator 10 is activated to inflate the air chamber 4. The control device 13 compares the acquired real-time pressure data with the preset target pressure range. When it is determined that the real-time pressure data is lower than the lower limit of the target pressure range, it indicates that the air pressure in the air chamber 4 is insufficient and cannot provide enough driving force for the water purification chamber 3 to output water. At this time, the control device 13 outputs an inflation start signal to activate the inflation actuator 10 installed on the second pipeline to inflate the air chamber 4. The inflation actuator 10 includes a gas path solenoid valve 11 and an air pump 12. When inflation is activated, the gas path solenoid valve 11 opens and the air pump 12 operates. External gas is pumped into the air chamber 4 through the air supply port 6 and the second pipeline, causing the air pressure in the air chamber 4 to gradually increase. Optionally, when the real-time pressure data is between the lower limit of the target pressure range and the warning pressure value, the control device 13 also generates a warning signal to remind the user to pay attention to the pressure status before formally triggering inflation.

[0055] S305, after a first preset time elapsed since the real-time pressure data enters the preset buffer zone, the inflation actuator 10 stops inflating the air chamber 4. The preset buffer zone is located within the target pressure range and adjacent to its upper limit. During the continuous inflation of the air chamber 4 by the inflation actuator 10, the control device 13 continuously monitors the changes in the real-time pressure data. When the real-time pressure data rises and enters the preset buffer zone, the control device 13 starts timing for the first preset time. After the first preset time elapsed since the real-time pressure data enters the preset buffer zone, the control device 13 outputs an inflation stop signal, stopping the inflation actuator 10 from inflating the air chamber 4. The preset buffer zone is located within the target pressure range and adjacent to its upper limit; that is, the lower limit of the buffer zone is higher than the midpoint of the target pressure range, and the upper limit does not exceed the upper limit of the target pressure range. The first preset time is determined based on the inflation rate of the inflation actuator 10 and the volume of the air chamber 4 to ensure that the amount of gas injected within this time elapsed allows the pressure of the air chamber 4 to stably fall within the target pressure range after inflation stops. By adopting a control method that delays shutdown after entering the buffer zone, a mandatory minimum inflation time is provided. Once the pressure reaches the lower limit of the buffer zone, the system will continue to inflate for at least the first preset time, regardless of subsequent pressure changes due to signal fluctuations or slight pressure drops. This naturally eliminates the "stop-start-stop" oscillation phenomenon caused by signal jitter or slight pressure drops near the shutdown threshold. On the other hand, by moving the shutdown control point from "pressure reaching a specific value" to "starting timing upon entering the buffer zone," the fixed inflation volume determined by the first preset time takes the lead in the shutdown timing. The uncertain inflation volume caused by the mechanical inertia delay of the air pump shutdown and the system response lag is only a minor disturbance, and its fluctuation range is included within the design margin of the buffer zone. It no longer affects the final stable pressure result after shutdown, thus ensuring that the final stable pressure after inflation stops is fully and reliably within the target operating range. Furthermore, during the first preset inflation period, if the real-time pressure data is abnormally higher than the upper limit of the target pressure range, the control device 13 determines that the inflation is excessive, generates a high-pressure abnormality alarm signal, and locks the inflation execution component 10 to prevent it from starting, thereby achieving overpressure protection.

[0056] S307, after a second preset time elapsed since inflation stopped, the target pressure data detected by the pressure detection device 7 is acquired. From the moment the inflation execution component 10 stops inflating the air chamber 4, the control device 13 begins timing for the second preset time; after this second preset time elapsed, the control device 13 again acquires the pressure data detected by the pressure detection device 7 as the target pressure data. The purpose of setting the second preset time is to wait for the gas pressure in the air chamber 4 to fully stabilize after inflation stops, avoiding pressure reading deviations caused by factors such as pressure shock at the moment the air pump is turned off, gas flow inertia in the pipeline, or diaphragm deformation and rebound, thereby ensuring that the acquired target pressure data can truly reflect the stable pressure state of the air chamber 4 after inflation is completed.

[0057] S309, the target pressure data is compared with the target pressure range to obtain the inflation verification result. The control device 13 compares the target pressure data with the target pressure range to obtain the inflation verification result, in order to determine whether the inflation operation has achieved the expected effect. Specifically, if the target pressure data is within the target pressure range, the inflation is considered successful and the inflation verification result is qualified; if the target pressure data is lower than the lower limit of the target pressure range, it indicates that the inflation has failed to bring the pressure of the air cavity 4 to the target range, and the control device 13 controls the inflation execution component 10 to perform secondary air replenishment to attempt to replenish the pressure; if the target pressure data detected again after secondary air replenishment is still lower than the lower limit of the target pressure range, the control device 13 determines that there is an abnormal leak in the air cavity 4 and generates a leak fault alarm signal to prompt the user to perform timely maintenance; if the target pressure data is higher than the upper limit of the target pressure range, an overcharge alarm signal is generated to indicate that there is an overcharge abnormality in the system. Through the above inflation verification mechanism, the system can not only automatically replenish air when it is underinflated, but also identify continuous pressure deficiency faults caused by leakage, thereby improving the reliability and maintainability of the system.

[0058] The pressure tank air control system of this application can monitor the pressure status of the pressure tank in real time, providing early warnings and preventative maintenance prompts to prevent problems before they occur. The system can achieve fully automatic inflation via a built-in air pump, or prompt the user to connect an external air pump for inflation. The inflation method can be flexibly selected according to different product configurations, improving the user experience. Compared to the traditional method of maintenance only after the user notices insufficient water output, the inflation trigger condition of this application is automatically determined by the control device based on a preset pressure range. This allows for timely air replenishment before the pressure drops to a level that affects usability, ensuring the continuous and stable operation of the water purifier.

[0059] On the other hand, a smart water purifier is also provided, including any of the pressure tank pneumatic control systems provided in the above system embodiments.

[0060] Specifically, the intelligent water purifier also includes a filter cartridge assembly, an inlet solenoid valve, a faucet, and a control mainboard. The pressure tank body 1 of the pressure tank pneumatic control system is connected between the purified water outlet of the filter cartridge assembly and the faucet via a first pipe. The air replenishment end of the air-pressurizing actuator 10 is connected to the air replenishment port 6 of the pressure tank body 1 via a second pipe. The control device 13 is integrated into the control mainboard of the water purifier. The purified water produced by the water purifier is stored in the purified water chamber 3 of the pressure tank body 1. When the user opens the faucet, the air pressure in the air chamber 4 pushes the diaphragm 2 to expel the purified water. When the control device 13 detects through the pressure detection device 7 that the pressure in the air chamber 4 is lower than the lower limit of the target pressure range, it automatically activates the air-pressurizing actuator 10 to replenish air, ensuring that the pressure tank is always in optimal working condition.

[0061] In summary, the pressure tank pneumatic control system of this application solves the problems of repeated start-stop and pressure instability by setting the inflation shutdown condition to a delayed shutdown after entering the buffer zone, using extremely simple control logic. Regarding the repeated start-stop problem, a mandatory minimum inflation time is provided: once the pressure reaches the lower limit of the buffer zone, regardless of whether the pressure continues to rise, fluctuates slightly, or falls back, the system will continue to inflate for at least a fixed first preset time. This naturally eliminates the possibility of "stop-start-stop" oscillations in a very short time due to instantaneous signal jitter or a slight pressure drop at the shutdown threshold. To address the issue of pressure stability after inflation, this application changes the shutdown timing mechanism by shifting the shut-off control point from "pressure reaching a specific value" to "entering the buffer zone." The predetermined inflation volume, determined by a first preset duration, takes precedence in determining the shutdown timing. The uncertain air volume caused by the mechanical inertia delay and system response lag during pump shutdown is merely a minor disturbance following this predetermined inflation volume, and its fluctuation range is contained within the design margin of the buffer zone, no longer affecting the final stable pressure after shutdown. This ensures that the final stable pressure after shutdown is fully and reliably within the target operating range, thus resolving the problems of insufficient or seemingly over-inflated inflation in one go. This application achieves excellent control performance without requiring complex pressure stability judgment logic, resulting in lower cost and higher reliability.

[0062] In this application, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0063] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, while this specification describes specific embodiments, other embodiments are also within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in the order shown in different embodiments and still achieve the desired results. Additionally, the processes depicted in the drawings do not necessarily require a specific order or sequence of connections to achieve the desired results; in some implementations, parallel processing of multiple tasks is possible or may be advantageous.

[0064] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. The focus of each embodiment is to describe the differences from other embodiments.

[0065] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pressure tank pneumatic control system, characterized in that, The system includes: The pressure tank body is divided into a water purification chamber and an air chamber by a diaphragm; the water purification chamber is connected to the inlet and outlet via a first pipe, and the air chamber is connected to the air supply port via a second pipe. A pressure detection device is installed on the first pipeline to detect real-time pressure data; An inflation actuator, disposed on the second pipeline, is used to controllably inflate or stop inflating the air cavity; A control device is electrically connected to the pressure detection device and the inflation execution component, respectively. The control device is configured to: when the real-time pressure data is lower than the lower limit of the target pressure range, start the inflation execution component to inflate the air cavity; after a first preset time period from when the real-time pressure data enters the preset buffer zone, stop the inflation execution component from inflating the air cavity, wherein the preset buffer zone is located within the target pressure range and adjacent to its upper limit.

2. The pressure tank pneumatic control system according to claim 1, characterized in that, The control device is further configured to generate a warning signal when the real-time pressure data is between the lower limit of the target pressure range and the warning pressure value; the warning pressure value is higher than the lower limit of the target pressure range and lower than the upper limit of the target pressure range.

3. The pressure tank pneumatic control system according to claim 1, characterized in that, The pressure detection device is further configured to detect the target pressure data after a second preset time period following the start of inflation; the control device is further configured to compare the target pressure data with the target pressure range to obtain the inflation verification result.

4. The pressure tank pneumatic control system according to claim 3, characterized in that, The step of comparing the target pressure data with the target pressure range to obtain the inflation verification result includes: If the target pressure data is lower than the lower limit of the target pressure range, then the inflation execution component is controlled to perform secondary inflation. If the target pressure data detected after the second air replenishment is still lower than the lower limit of the target pressure range, it is determined that there is a leak in the air cavity, and a leak fault alarm signal is generated.

5. The pressure tank pneumatic control system according to claim 1, characterized in that, The control device is also configured to: When the real-time pressure data is higher than the upper limit of the target pressure range, it is determined that the inflation is excessive. A high-pressure abnormality alarm signal is generated, and the inflation actuator is locked to prevent it from starting.

6. The pressure tank pneumatic control system according to claim 1, characterized in that, The control device is also configured to: Obtain the inflation trigger pressure value, inflation duration, and stable pressure value after inflation stops from historical inflation operations; The pressure decay trend of the air cavity is determined based on multiple sets of inflation trigger pressure values, inflation duration, and stable pressure values ​​after inflation stops. Based on the pressure decay trend, the monitoring cycle of the pressure detection device for detecting the real-time pressure data is adjusted.

7. The pressure tank pneumatic control system according to claim 6, characterized in that, The control device is also configured to: Based on the pressure decay trend, a preventative maintenance reminder is output before the real-time pressure data approaches the lower limit of the target pressure range.

8. The pressure tank pneumatic control system according to claim 1, characterized in that, The first preset duration is determined based on the inflation rate of the inflation actuator and the volume of the air cavity.

9. The pressure tank pneumatic control system according to claim 1, characterized in that, The inflation actuator includes a pneumatic solenoid valve and an air pump.

10. A smart water purifier, characterized in that, Includes the pressure tank pneumatic control system as described in any one of claims 1 to 9.

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