CN-121993875-A - Anion purifier ion yield drift self-calibration control method and system

CN121993875ACN 121993875 ACN121993875 ACN 121993875ACN-121993875-A

Abstract

The invention relates to the technical field of air purification and discloses a self-calibration control method and a self-calibration control system for the ion yield drift of an anion purifier, wherein the method comprises the steps of obtaining the accumulated running time of an air pump to determine the reference drift amount of mechanical fatigue; the method comprises the steps of establishing a theoretical evaporation model, solving theoretical water evaporation rate and theoretical conductivity reference slope, comparing the theoretical water evaporation rate and the theoretical conductivity reference slope with actual conductivity change slope to obtain deviation indexes, executing binary judgment of water quality states and generating water quality damping drift quantity according to the deviation indexes, superposing the mechanical fatigue reference drift quantity and the water quality damping drift quantity to obtain total performance drift quantity, generating a target driving instruction, and executing clamping output by combining an operation envelope.

Inventors

Song Hufeng
FENG MING

Assignees

西安市新希望医疗器械有限公司

Dates

Publication Date: 20260508
Application Date: 20260409

Claims (10)

1. A method for self-calibration control of anion purifier ion yield drift, the method comprising: Acquiring the accumulated running time of the air pump, and determining the mechanical fatigue reference drift amount based on the accumulated running time of the air pump; Calculating saturated steam pressure difference of a water-gas interface, obtaining theoretical water evaporation rate according to the saturated steam pressure difference of the water-gas interface, calculating theoretical conductivity reference slope according to the theoretical water evaporation rate, obtaining actual conductivity change slope, comparing the actual conductivity change slope with the theoretical conductivity reference slope to obtain conductivity deviation index, executing binary judgment of water quality state according to the conductivity deviation index, and generating water quality damping drift amount according to the judgment result; And linearly superposing the mechanical fatigue reference drift amount and the water quality damping drift amount to obtain total performance drift amount, generating a target driving instruction based on the total performance drift amount, judging whether to execute operation envelope clamping on the target driving instruction, and outputting the target driving instruction or the clamped target driving instruction.
2. The method of claim 1, wherein the method for determining the mechanical fatigue reference drift amount comprises: taking the accumulated running time of the air pump as an index, inquiring a prestored diaphragm stiffness life cycle attenuation curve, and determining the current pressure attenuation percentage through linear interpolation; a drive power compensation value is calculated based on the current percent pressure decay, and the drive power compensation value is defined as a mechanical fatigue reference drift amount.
3. The method for self-calibration control of ion yield drift of an anion purifier according to claim 2, wherein the method for calculating the saturated vapor pressure difference of the water-gas interface comprises: collecting the current environment temperature, environment humidity and internal heat load of the equipment, calculating the actual temperature of the water body according to the internal heat load of the equipment, and calculating the saturated vapor pressure at the water-air interface according to the actual temperature of the water body; And calculating the actual partial pressure of the water vapor in the current air according to the ambient temperature and the ambient humidity, and subtracting the actual partial pressure of the water vapor in the air from the saturated vapor pressure at the water-air interface to obtain the saturated vapor pressure difference of the water-air interface.
4. The method of claim 3, wherein the method for performing binary water quality state determination comprises: Comparing the conductivity deviation index with a preset evaporation tolerance threshold, judging a natural concentration state if the conductivity deviation index is smaller than or equal to the evaporation tolerance threshold, and judging a pollution invasion state if the conductivity deviation index is larger than the evaporation tolerance threshold.
5. The method for self-calibration control of ion yield drift of an anion purifier according to claim 4, wherein the method for generating the water quality damping drift according to the determination result comprises the following steps: If the judging result is in a natural concentrated state, setting the water quality damping drift amount to be zero, and if the judging result is in a pollution invasion state, inputting the conductivity deviation index into a pre-stored impurity damping mapping function to calculate the corresponding water quality damping drift amount.
6. The method of claim 5, wherein the generating the target drive command based on the total performance drift amount comprises: And (3) invoking a voltage-power response characteristic curve of the air pump, reversely addressing and calculating a driving voltage increment by taking the total performance drift amount as a target value, and superposing the driving voltage increment to a basic driving voltage to generate a target driving instruction.
7. The method of claim 6, wherein the determining whether to perform operating envelope clamping for the target drive command comprises: Calculating a residual water quantity estimated value according to the theoretical water evaporation rate and the accumulated running time of the air pump since the last water adding, comparing the residual water quantity estimated value with a preset water quantity safety threshold, if the residual water quantity estimated value is larger than or equal to the water quantity safety threshold, not executing running envelope clamping, directly outputting a target driving instruction, and if the residual water quantity estimated value is smaller than the water quantity safety threshold, executing the running envelope clamping on the target driving instruction.
8. The method of claim 7, wherein the accumulated running time of the air pump since the last water addition is the current reading value of a water addition timer, and the water addition timer is zeroed and restarted to count when a water addition event is detected; The method for detecting the water adding event comprises the steps of continuously monitoring the conductivity value of the current water body in the water tank of the negative ion purifier through a conductivity sensor, and judging that the water adding event is detected when the conductivity value falls by an extent exceeding a preset conductivity sudden drop threshold value within a preset detection time window.
9. The method of claim 8, wherein the method of performing operating envelope clamping on the target drive command comprises: determining a corresponding upper limit of available driving power according to the residual water quantity estimated value, and converting a driving voltage value corresponding to the target driving instruction into a power value corresponding to the target driving instruction; If the power value corresponding to the target driving instruction is larger than the upper limit of the available driving power, the driving voltage value corresponding to the target driving instruction is forcedly truncated to the driving voltage value corresponding to the upper limit of the available driving power, and the truncated driving voltage value is output as the clamped target driving instruction.
10. A negative ion purifier ion yield drift self-calibration control system for implementing a negative ion purifier ion yield drift self-calibration control method according to any one of claims 1-9, the system comprising: The mechanical fatigue drift module is used for acquiring the accumulated running time of the air pump and determining the reference drift amount of the mechanical fatigue based on the accumulated running time of the air pump; The water quality damping drift module is used for calculating the saturated steam pressure difference of a water-air interface, obtaining a theoretical water evaporation rate according to the saturated steam pressure difference of the water-air interface, calculating a theoretical conductivity reference slope according to the theoretical water evaporation rate, obtaining an actual conductivity change slope, comparing the actual conductivity change slope with the theoretical conductivity reference slope to obtain a conductivity deviation index, executing binary judgment of a water quality state according to the conductivity deviation index, and generating a water quality damping drift amount according to a judgment result; And the driving instruction generation module is used for linearly superposing the mechanical fatigue reference drift amount and the water quality damping drift amount to obtain a total performance drift amount, generating a target driving instruction based on the total performance drift amount, judging whether to execute operation envelope clamping on the target driving instruction, and outputting the target driving instruction or the clamped target driving instruction.

Description

Anion purifier ion yield drift self-calibration control method and system Technical Field The invention relates to the technical field of air purification, in particular to a self-calibration control method and a self-calibration control system for ion yield drift of a negative ion purifier. Background The anion purifier utilizes the Lyrad effect, namely the principle that water drops are crushed under high-speed airflow shearing to generate anions, and has wide application in improving indoor air quality, settling particulate matters and sterilizing. In order to maintain a constant purification performance, it is important to precisely control the air pump pressure and the water quality state. In the prior art, as disclosed in chinese patent application with publication number CN109974157a, a mute anion purifier capable of being remotely controlled, which implements remote monitoring and mute operation of a device by integrating an air quality detector, a PLC controller and a wireless transmitter, and mainly focuses on optimization of a device structure and improvement of interactive experience. Another example is chinese patent application CN119983454a, which discloses a control method and apparatus for a microminiature negative oxygen ion generator, the technology uses a machine learning model to analyze air quality information, and enhances the electrode by quantum dot material to optimize ionization efficiency, and meanwhile, builds a distributed purification network to realize task allocation, focusing on improvement of electrode material and networked intelligent cooperation. Although the prior art has advanced in terms of structural convenience and ionization efficiency improvement, there is still a limit in maintaining constant control of ion yield over the full life cycle. In the long-term operation of the anion purifier, the water conductivity signal serving as a core feedback variable has a physical meaning 'ambiguity' characteristic, so that the system is difficult to distinguish natural evaporation concentration of water caused by environmental thermodynamic factors from water quality deterioration caused by invasion of exogenous pollutants. Specifically, under the high-temperature low-humidity environment, the natural evaporation of water causes the physical increase of the mineral concentration in the water tank, the conductivity rises along with the physical increase, but the surface tension characteristic of the water body is not changed substantially, the excitation efficiency of the Lyard effect is still maintained at a normal level, and conversely, if the increase of the conductivity is caused by the mixing of external impurities, the surface tension of the water body is changed directly, the breakage of water drops is restrained from physical mechanism, and the real attenuation of the ion yield is caused. The existing control logic lacks decoupling capability for the two distinct physical processes, and often adopts a single negative feedback mechanism, namely, once the conductivity rise is detected, the water quality is judged to be poor, so that the power of the air pump is forcedly increased. In addition, natural evaporation is usually accompanied by water level drop, and at this time, high-power driving of the air pump is very easy to induce dry combustion phenomenon at low water level, so as to accelerate thermal aging and fatigue damage of the rubber diaphragm, and finally, the service life of the device is greatly shortened and the expected ion generation amount cannot be maintained. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a self-calibration control method and a self-calibration control system for the ion yield drift of a negative ion purifier, wherein a thermodynamic theoretical evaporation model based on environmental parameters is constructed, a natural reference for conductivity change is established, an evaporation concentration component in an actual detection signal and a real water quality pollution component are subjected to accurate decoupling, and the total performance drift is generated by combining a mechanical fatigue reference drift amount determined by the accumulated running time of an air pump in a linear superposition mode. The invention effectively eliminates the false judgment of the deficiency and high conductivity caused by natural evaporation, realizes the double accurate compensation of hardware aging and water quality change, radically eliminates the risk of dry heating of the air pump caused by excessive compensation by operating an envelope clamping mechanism, and ensures the constant and safe operation of the ion yield in the whole life cycle of the equipment. In order to achieve the above purpose, the present invention provides the following technical solutions: a self-calibration control method for the ion yield drift of a negative ion purifier comprises the following steps: Acquiring the ac