Application method of plasma air disinfection and purification technology in commercial refrigerator

Abstract

The invention discloses an application method of a plasma air disinfection and purification technology in a commercial refrigerator, and relates to the technical field of plasma air disinfection and purification, a plasma purifier is selected according to the size of the commercial refrigerator, the air circulation condition and the required purification effect, the plasma purifier is installed at an air outlet of the commercial refrigerator, and the plasma air disinfection and purification technology is applied to the commercial refrigerator. A starting switch and a touch screen are adopted for starting, parameters of the plasma purifier are configured, a high-voltage electric field is adopted for generating an ionization effect to achieve plasma generation, a solid-state filter is adopted for removing solid-state impurities in air, and the problem that the solid-state impurities cannot be removed is solved; harmful gas in air is decomposed into harmless substances through oxidation-reduction reaction, the plasma purifier is controlled by an electronic control system to enter a standby state, the energy consumption of the plasma purifier is reduced, a grid electrode plate and a high-efficiency filter of the plasma purifier are regularly soaked and cleaned by adopting a neutral cleaning agent, and the service life of the plasma purifier is prolonged. And dust and dirt deposited on the surface are removed.

Description

Technical Field

[0001] The present invention relates to the field of plasma air disinfection and purification technology, and more specifically to an application method of the plasma air disinfection and purification technology in a commercial refrigerator. Background Art

[0002] As the commercial environment becomes increasingly complex, refrigerators are an important piece of equipment, and their sanitary condition is crucial to food quality and safety. Traditional disinfection methods may not meet this high standard, and plasma air disinfection and purification technology provides a new solution for the sanitary treatment of refrigerators. Plasma air disinfection and purification technology is a new disinfection technology based on the reaction of high-energy plasma with harmful substances such as bacteria, viruses, and molds in the air, making them inactive or even completely eliminated.

[0003] In the prior art, there are many deficiencies in the traditional plasma air disinfection and purification application methods. On the one hand, the traditional plasma air disinfection and purification application methods have high energy consumption and need to consume high-power electrical energy to generate plasma, which leads to an increase in the total energy consumption of commercial refrigerators and increases the cost of use. On the other hand, the traditional plasma air disinfection and purification application methods can only eliminate gaseous pollutants in the air, but cannot effectively remove solid impurities such as dust and foreign matter, which affects the purification effect. Therefore, the present invention proposes an application method of plasma air disinfection and purification technology in commercial refrigerators, aiming to provide an application method of plasma air disinfection and purification technology in commercial refrigerators that can reduce energy consumption and clear solid impurities. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention discloses an application method of plasma air disinfection and purification technology in a commercial refrigerator, which can reduce the use energy consumption and remove solid impurities. According to the size of the commercial refrigerator, the air circulation conditions and the required purification effect, a plasma purifier is selected and installed at the air outlet of the commercial refrigerator. A start switch and a touch screen are used to start and configure the parameters of the plasma purifier. A high-voltage electric field is used to generate an ionization effect to achieve the generation of plasma. A solid filter is used to remove solid impurities in the air, so as to solve the problem that the plasma air disinfection and purification application method can only eliminate gaseous pollutants in the air. Harmful gases in the air are oxidized and reduced to be decomposed into harmless substances through oxidation-reduction reactions, and an electronic control system is used to control the plasma purifier to enter a standby state, so as to reduce the energy consumption of the plasma purifier and reduce the use cost. A neutral detergent is used to regularly soak and clean the grid electrode plate and the high-efficiency filter of the plasma purifier to remove dust and dirt deposited on the surface, so as to ensure the best purification effect.

[0005] The present invention adopts the following technical solutions: A method for applying plasma air disinfection and purification technology in a commercial refrigerator comprises the following steps: Step 1: Choose and install a plasma purifier. According to the size of the commercial refrigerator, air circulation conditions and required purification effect, select a plasma purifier and install it at the air outlet of the commercial refrigerator. Step 2: Start and configure the parameters of the plasma purifier, start the plasma purifier using a start switch, and use a touch screen to input the parameters of the plasma purifier, the parameters of the plasma purifier including voltage, current, temperature and purification level; Step 3: generating plasma, using a high voltage electric field to generate an ionization effect to achieve the generation of plasma, wherein the plasma includes oxygen ions, free electrons and free radicals; Step 4: Adsorbing solid impurities in the air, using a solid filter to remove solid impurities in the air, the solid impurities include dust, microorganisms and food residues, the solid filter includes a pre-filter, a high-efficiency filter and a fan module, the fan module is arranged at the front end of the pre-filter, and the pre-filter is arranged at the front end of the high-efficiency filter; Step 5: decomposing harmful gases in the air, and decomposing the harmful gases in the air into harmless substances through redox reactions, wherein the harmful gases include chlorofluorocarbons, nitric oxide and sulfur dioxide; Step 6. The plasma purifier enters a standby state. An electronic control system is used to control the plasma purifier to enter a standby state. The electronic control system includes a data acquisition module, a data processing module, a control module and a data display module. The control module controls the plasma purifier to enter a standby state through a state control algorithm. The output end of the data acquisition module is connected to the input end of the data processing module, the output end of the data processing module is connected to the input end of the control module, and the output end of the control module is connected to the input end of the data display module. Step 7. Regular maintenance. A neutral detergent is used to regularly soak and clean the grid electrode plate and the high-efficiency filter of the plasma purifier to remove dust and dirt deposited on the surface.

[0006] As a further technical solution of the present invention, the ionization effect dissociates oxygen molecules into oxygen ions, free electrons and free radicals through the action of a high-energy electric field. The working steps of generating plasma by the ionization effect are as follows: Step 1, generating a high voltage electric field; The plasma purifier is connected to a socket of an external power source through a plug, and the external power source is started, so that the plasma purifier obtains electric energy. The plasma purifier converts the low voltage of the external power source into a high voltage through a transformer to generate a high voltage electric field; Step 2, generating plasma; The plasma purifier generates an ionization effect through a high-voltage electric field, ionizing oxygen molecules in the air into oxygen ions, free electrons and free radicals. The chemical equation of the ionization effect is: Step 3, releasing ions; The plasma purifier generates positive ions and negative ions through an ionizing material loaded with strontium titanate to stabilize the charge environment in the air. The chemical equation for the ionizing material to generate positive ions and negative ions is: As a further technical solution of the present invention, the working method of the solid-state filter includes the following steps: The S1 solid-state filter starts working after being powered on; The solid-state filter is provided with electric energy by an external power supply, and the solid-state filter is controlled to start working by a start switch; S2 external air enters the solid filter; The solid-state filter generates airflow through a fan module to draw external air into the filter, and controls the air flow by adjusting fan parameters, wherein the fan parameters include motor power, speed, wind pressure and air volume; S3 filters large particles in the air; The solid filter removes large particles in the air through a pre-filter to protect the high-efficiency filter. The large particles include food residues, sand and fibers. The pre-filter uses a metal mesh and sponge to form a barrier layer to filter out large particles in the air. S4 filters tiny particles in the air; The solid-state filter removes tiny particles in the air through a high-efficiency filter, and the tiny particles include dust particles, PM2.5 and bacteria and viruses. The high-efficiency filter intercepts dust particles in the air through a screen, and the high-efficiency filter removes PM2.5 and bacteria and viruses in the air by electrostatic adsorption.

[0007] As a further technical solution of the present invention, the harmful gas undergoes a redox reaction with oxygen ions, free electrons and free radicals under the conditions of high temperature of 200°C and ultraviolet irradiation to generate harmless hydrogen chloride, hydrogen fluoride, nitrogen dioxide ions and sulfate ions. The redox reaction accelerates the reaction rate and efficiency by adding metal catalysts and biological enzymes. The chemical equation of the redox reaction is: As a further technical solution of the present invention, the data acquisition module collects air quality data through an air quality detector, and the air quality data includes PM2.5 concentration, nitrogen monoxide concentration, sulfur dioxide concentration and chlorofluorocarbons. The data processing module smoothes the air quality data through a median filtering method to remove noise data. The data processing module corrects or adjusts the air quality data through zero-point drift correction to eliminate systematic errors and random errors.

[0008] As a further technical solution of the present invention, the control module constructs a state control algorithm based on the PID control algorithm to realize the control of the working state of the plasma purifier. The operation steps of the state control algorithm are as follows: S01 obtains current air quality data and sets target values; The state control algorithm receives the air quality data processed by the data processing module through the RS485 communication port, and the state control algorithm inputs the target value of the air quality data into the state control algorithm by means of host computer command input; S02 calculates the deviation value; The state control algorithm constructs a deviation function based on the least squares method to calculate the deviation between the current air quality data and the set air quality data target value. The deviation function removes the error during air quality data collection by adding an error adjustment factor. The formula of the deviation function is: S03 calculates the PID control amount; The state control algorithm calculates the control amount through the PID control amount function, and the PID control amount function calculates the proportional control amount, the derivative control amount and the integral control amount according to the deviation between the current air quality data and the set air quality data target value. The formula of the PID control amount function is: S04 outputs control instructions; The state control algorithm uses programming statements to output the output of the PID calculation as a control instruction to the drive motor. The drive motor adjusts the operation and speed of the motor according to the control instruction to control the operating state of the plasma purifier. If the current air quality data exceeds the set target value, the plasma purifier enters the working state. If the current air quality data is lower than the set target value, the plasma purifier enters the standby state.

[0009] As a further technical solution of the present invention, the data display module realizes the display of air quality data and the operating status of the plasma purifier through a liquid crystal display screen. The liquid crystal display screen includes a display data processing module, a driving circuit module and a display module. The data processing module converts the air quality data and the operating status of the plasma purifier into a liquid crystal display signal through a decoder. The driving circuit module drives the liquid crystal display screen for display through an oscillation and modulation circuit. The display module realizes the liquid crystal display screen displaying different data information by driving liquid crystal molecules and controlling the backlight.

[0010] As a further technical solution of the present invention, the neutral detergent is diluted with water in a ratio of neutral detergent to water = 1:3 to obtain a cleaning solution for the grid electrode plate and the high-efficiency filter, and the cleaning solution is covered on the grid electrode plate and the high-efficiency filter by soaking or applying, so as to clean the grid electrode plate and the high-efficiency filter. The present invention has the following positive and beneficial effects compared with the prior art: The invention discloses an application method of plasma air disinfection and purification technology in a commercial refrigerator, which can reduce the use energy consumption and remove solid impurities. According to the size of the commercial refrigerator, the air circulation situation and the required purification effect, a plasma purifier is selected and installed at the air outlet of the commercial refrigerator. A start switch and a touch screen are used to start and configure the parameters of the plasma purifier. A high-voltage electric field is used to generate an ionization effect to achieve the generation of plasma. A solid filter is used to remove solid impurities in the air, so as to solve the problem that the plasma air disinfection and purification application method can only eliminate gaseous pollutants in the air. Harmful gases in the air are oxidized and reduced to be decomposed into harmless substances through oxidation-reduction reactions, and an electronic control system is used to control the plasma purifier to enter a standby state, so as to reduce the energy consumption of the plasma purifier and reduce the use cost. A neutral detergent is used to regularly soak and clean the grid electrode plate and the high-efficiency filter of the plasma purifier to remove dust and dirt deposited on the surface, so as to ensure the best purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall process of an application method of the plasma air disinfection and purification technology in a commercial refrigerator of the present invention; Figure 2 A schematic diagram of the working process of a solid-state filter in a method for applying a plasma air disinfection and purification technology in a commercial refrigerator according to the present invention; Figure 3 A schematic diagram of the architecture of an electronic control system in a method for applying plasma air disinfection and purification technology in a commercial refrigerator according to the present invention; Figure 4 A schematic diagram of the workflow of a state control algorithm in a method for applying a plasma air disinfection and purification technology in a commercial refrigerator according to the present invention; Figure 5 This is a schematic diagram of the architecture of a data display module in a method for applying plasma air disinfection and purification technology in a commercial refrigerator according to the present invention. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] A method for applying plasma air disinfection and purification technology in a commercial refrigerator comprises the following steps: Step 1: Choose and install a plasma purifier. According to the size of the commercial refrigerator, air circulation conditions and required purification effect, select a plasma purifier and install it at the air outlet of the commercial refrigerator. Step 2: Start and configure the parameters of the plasma purifier, start the plasma purifier using a start switch, and use a touch screen to input the parameters of the plasma purifier, the parameters of the plasma purifier including voltage, current, temperature and purification level; Step 3: generating plasma, using a high voltage electric field to generate an ionization effect to achieve the generation of plasma, wherein the plasma includes oxygen ions, free electrons and free radicals; Step 4: Adsorbing solid impurities in the air, using a solid filter to remove solid impurities in the air, the solid impurities include dust, microorganisms and food residues, the solid filter includes a pre-filter, a high-efficiency filter and a fan module, the fan module is arranged at the front end of the pre-filter, and the pre-filter is arranged at the front end of the high-efficiency filter; Step 5: decomposing harmful gases in the air, and decomposing the harmful gases in the air into harmless substances through redox reactions, wherein the harmful gases include chlorofluorocarbons, nitric oxide and sulfur dioxide; Step 6: The plasma purifier enters a standby state. An electronic control system is used to control the plasma purifier to enter a standby state. The electronic control system includes a data acquisition module, a data processing module, a control module and a data display module. The control module controls the plasma purifier to enter a standby state through a state control algorithm. The output end of the data acquisition module is connected to the input end of the data processing module, the output end of the data processing module is connected to the input end of the control module, and the output end of the control module is connected to the input end of the data display module. Step 7: Regular maintenance: Use a neutral detergent to regularly soak and clean the grid electrode plate and high-efficiency filter of the plasma purifier to remove dust and dirt deposited on the surface. In the above embodiment, the ionization effect dissociates oxygen molecules into oxygen ions, free electrons and free radicals through the action of a high-energy electric field. The working steps of the ionization effect to generate plasma are as follows: Step 1, generating a high voltage electric field; The plasma purifier is connected to a socket of an external power source through a plug, and the external power source is started, so that the plasma purifier obtains electric energy. The plasma purifier converts the low voltage of the external power source into a high voltage through a transformer to generate a high voltage electric field; Step 2, generating plasma; The plasma purifier generates an ionization effect through a high-voltage electric field, ionizing oxygen molecules in the air into oxygen ions, free electrons and free radicals. The chemical equation of the ionization effect is: Step 3, releasing ions; The plasma purifier generates positive ions and negative ions through an ionizing material loaded with strontium titanate to stabilize the charge environment in the air. The chemical equation for the ionizing material to generate positive ions and negative ions is: In a specific embodiment, the core principle of the plasma air purifier is to use a stable DC high-voltage electric field to cause a large number of air molecules in the environment to ionize into positive and negative ions, thereby purifying and degrading harmful gases in the air during the process of adsorption, ionization, diffusion, and recombination, thereby achieving the purpose of purifying the air. In the working process of the specific embodiment, the process of plasma generation by the plasma purifier is as follows: 1. Produce DC high voltage: The plasma purifier usually uses transformers, capacitors and other equipment to convert AC power into DC high voltage electric field; 2. Release electrons: The high electric field can ionize atoms or molecules in the air, and electrons and atomic / molecular free electrons are released to form unique ions, which are negative ions carrying negative charges and positive ions carrying positive charges; 3. Uniform electron free path: The generated ions will form a stable plasma after further ionization and attachment processes. It can be self-driven and self-regulated, and form a uniformly distributed plasma area inside the air purifier, with a radius of approximately 1 mm to 2 mm; 4. Stabilize the charge environment in the air: Changes in the concentration of charged gas molecules in the air will affect the charge distribution shape and size of the electrostatic field in the air, thereby causing instability in the ion yield generated by the ionizer, which will reduce the effectiveness and stability of the air ion purifier. The ionization material loaded with strontium titanate utilizes the negative ions in the hierarchical structure of strontium titanate to stabilize the charge in the environment, inhibits the electrical neutralization of positive and negative ions, thereby stabilizing the charge environment in the air, increasing the survival period of the plasma, and improving the purification effect of the plasma evolver.

[0014] In the above embodiment, the working method of the solid-state filter includes the following steps: The S1 solid-state filter starts working after being powered on; The solid-state filter is provided with electric energy by an external power supply, and the solid-state filter is controlled to start working by a start switch; S2 external air enters the solid filter; The solid-state filter generates airflow through a fan module to draw external air into the filter, and controls the air flow by adjusting fan parameters, wherein the fan parameters include motor power, speed, wind pressure and air volume; S3 filters large particles in the air; The solid filter removes large particles in the air through a pre-filter to protect the high-efficiency filter. The large particles include food residues, sand and fibers. The pre-filter uses a metal mesh and sponge to form a barrier layer to filter out large particles in the air. S4 filters tiny particles in the air; The solid-state filter removes tiny particles in the air through a high-efficiency filter, and the tiny particles include dust particles, PM2.5 and bacteria and viruses. The high-efficiency filter intercepts dust particles in the air through a screen, and the high-efficiency filter removes PM2.5 and bacteria and viruses in the air by electrostatic adsorption.

[0015] In a specific embodiment, a solid filter is a common gas purification device used to remove solid impurities in the air. Its working principle is to intercept solid impurities such as particulate matter, dust, smoke, microorganisms, etc. in the air flow on the surface or inside through the filter medium, so that the concentration of solid particles in the air passing through the filter eventually reaches a certain level to achieve a purification effect. In the working process of the specific embodiment, the working process of the solid filter is as follows: first, the solid filter is connected to the power supply socket of the external power supply through a plug, and the external power supply is used to provide power to the solid filter, and then the solid filter is started by the start switch, so that the solid filter starts to work; secondly, the external power supply provides power to the solid filter while also providing power to the fan module. When the voltage provided to the fan module by the power supply meets the requirements, the motor can start and drive the fan to rotate, generating airflow to suck the external air into the filter, and by controlling the rotation speed and angle of the fan, multiple parameters of the fan module, such as air flow, airflow direction, airflow intensity, etc., can be adjusted; then, the filter medium of the pre-filter is used to filter out particles with larger diameters in the air to reduce the burden of the high-efficiency filter and protect the working state of the high-efficiency filter; finally, the high-efficiency filter forms a continuous micro-channel through filter media such as electrostatic filter screens and glass fibers, and air flows through it. Through the collision and screening of air and filter media, tiny particles with a diameter of less than 0.5 microns are selectively adsorbed and removed. The statistical results of the solid impurity content in the air after being filtered by the solid filter are shown in Table 1: Two methods are respectively used to filter the air in the commercial freezer. Method 1 filters the air in the commercial freezer through an activated carbon filter, and Method 2 filters the air in the commercial freezer through a solid filter. The air quality data after filtration are shown in Table 1. By comparing the filtering effects of the two methods, it can be seen that the filtering effect of Method 2 is better than that of Method 1. It can be seen that the solid-state filter of the present invention has outstanding technical effects in removing solid impurities.

[0016] In the above embodiment, the harmful gas undergoes a redox reaction with oxygen ions, free electrons and free radicals under the conditions of high temperature of 200° C. and ultraviolet irradiation to generate harmless hydrogen chloride, hydrogen fluoride, nitrogen dioxide ions and sulfate ions. The redox reaction accelerates the reaction rate and efficiency by adding metal catalysts and biological enzymes. The chemical equation of the redox reaction is: In a specific embodiment, a redox reaction is an electron exchange process of an element. Oxidation refers to a substance losing electrons, and reduction refers to a substance gaining electrons. In a redox reaction, the electron transfer between atoms and ions leads to changes in the chemical structure of molecules and ions. In the working process of a specific embodiment, the gas entering the plasma purifier reacts chemically with the plasma generated under a high voltage electric field under the conditions of a high temperature of 200°C and ultraviolet irradiation, converting harmful gases into harmless substances, wherein hydrofluorocarbons undergo a redox reaction with superoxide radicals to generate hydrogen fluoride and carbon dioxide, and nitric oxide and sulfur dioxide undergo an oxidation reaction with oxygen ions to generate nitrogen dioxide ions and sulfate ions. The rate of the redox reaction can be accelerated by adding metal catalysts and biological enzymes to improve the reaction efficiency. The statistical results of the content of harmful gases in the plasma-treated gas are shown in Table 2: Two methods are respectively used to purify the air in the commercial freezer. Method 1 purifies the air in the commercial freezer by mechanical filtration, and method 2 purifies the air in the commercial freezer by plasma. The air quality data after purification are shown in Table 2. By comparing the purification effects of the two methods, it can be seen that the purification effect of method 2 is better than that of method 1. It can be seen that the plasma purification of harmful gases of the present invention has outstanding technical effects.

[0017] In the above embodiment, the data acquisition module collects air quality data through an air quality detector, and the air quality data includes PM2.5 concentration, nitrogen monoxide concentration, sulfur dioxide concentration and chlorofluorocarbons. The data processing module smoothes the air quality data through a median filtering method to remove noise data. The data processing module corrects or adjusts the air quality data through zero drift correction to eliminate systematic errors and random errors.

[0018] In a specific embodiment, first, an air quality detector is installed at the air outlet of a commercial freezer to collect the PM2.5 concentration, nitric oxide concentration, sulfur dioxide concentration and chlorofluorocarbon concentration in the air in real time, and then the collected data is transmitted to a data processing module. Then, the collected data is processed by the data processing module to improve the reliability and accuracy of the data. The data processing module removes outliers, noise and other information in the data while retaining the original characteristics of the data through a median filtering method, and establishes a reference value of the sensor based on the linear fitting of the sensor signal through zero drift correction, thereby eliminating the measurement data error caused by error changes.

[0019] In the above embodiment, the control module constructs a state control algorithm based on the PID control algorithm to realize the control of the working state of the plasma purifier. The operation steps of the state control algorithm are as follows: S01 obtains current air quality data and sets target values; The state control algorithm receives the air quality data processed by the data processing module through the RS485 communication port, and the state control algorithm inputs the target value of the air quality data into the state control algorithm by means of host computer command input; S02 calculates the deviation value; The state control algorithm constructs a deviation function based on the least squares method to calculate the deviation between the current air quality data and the set air quality data target value. The deviation function removes the error during air quality data collection by adding an error adjustment factor. The formula of the deviation function is: S03 calculates the PID control amount; The state control algorithm calculates the control amount through the PID control amount function, and the PID control amount function calculates the proportional control amount, the derivative control amount and the integral control amount according to the deviation between the current air quality data and the set air quality data target value. The formula of the PID control amount function is: S04 outputs control instructions; The state control algorithm uses programming statements to output the output of the PID calculation as a control instruction to the drive motor. The drive motor adjusts the operation and speed of the motor according to the control instruction to control the operating state of the plasma purifier. If the current air quality data exceeds the set target value, the plasma purifier enters the working state. If the current air quality data is lower than the set target value, the plasma purifier enters the standby state.

[0020] In a specific embodiment, an application platform of a state control algorithm can be constructed. During the operation of the platform, a hardware platform can be constructed, such as by constructing the following components for processing: a programmable controller, a storage device, a bus, and a display. The following is a more detailed description of the implementation method: Programmable controller: A programmable controller can perform arithmetic and logical operations on data, as well as basic operations such as reading and storing data in memory.

[0021] Storage devices: The state control algorithm needs to store a large amount of air quality data and needs to read and write data quickly during the operation process, so high-speed storage devices such as SSD (solid-state drive) or NVMe (non-volatile memory extension) are required.

[0022] Bus: The bus is used to connect the various components of the equipment, and realize communication and coordination between the various components by transmitting data, control and address information. Display: The display is used to display the operation status and parameters of the equipment algorithm, providing users with a window to observe and adjust parameters in a timely manner.

[0023] With the collaboration of these hardware components, the operation of the state control algorithm can be realized according to specific application needs and system requirements. In actual applications, control instructions can be output according to the current air quality data to control the working state of the plasma purifier, reduce the energy consumption of the plasma purifier, and thus reduce the total energy consumption of commercial freezers and reduce the cost of use.

[0024] In a specific embodiment, the PID control algorithm is an adaptive control algorithm for feedback control systems. The control variable is adjusted to meet the target requirements by weighted combination operations on the error, error change rate and error integral. The PID control algorithm consists of three control parameters: proportional coefficient (P), integral coefficient (I) and differential coefficient (D), where the proportional coefficient P is the linear change of the current error value, corresponding to the current deviation value. This parameter is used to adjust the system's sensitivity to errors. When the deviation increases, the adjustment amount of the control variable also increases; the integral coefficient I is the linear change of the error integral, which is used to stabilize the static and dynamic performance of the system. It can correct long-term deviations, so that even if the proportional control cannot completely solve the problem, more precise regulation can be achieved through integral control; the differential coefficient D is the linear change of the deviation change rate, which is used to increase the system's response speed and suppress system oscillations caused by fluctuations in the dependent variable. The specific implementation process of the state control algorithm constructed based on the PID control algorithm is as follows: first, the air quality data processed by the data processing module is received through the RS485 communication port, and the upper computer inputs the target value of the air quality data into the control system by sending commands; secondly, the target value is compared with the current air quality data, and the deviation between the two is calculated by constructing a deviation function based on the least squares method; then, the deviation is used as input, and the proportional control amount, derivative control amount and integral control amount are calculated according to the PID control algorithm, and then the proportional control amount, derivative control amount and integral control amount are weightedly combined to output the control amount of the state control algorithm; finally, the control amount is converted into a control instruction through code programming to control the operation of the drive motor, and then the working state of the plasma purifier is controlled. When the current air quality data is lower than the set target value, the plasma purifier enters the standby state to reduce energy consumption and reduce costs.

[0025] In the above embodiment, the data display module realizes the display of air quality data and the operating status of the plasma purifier through a liquid crystal display screen. The liquid crystal display screen includes a display data processing module, a drive circuit module and a display module. The data processing module converts the air quality data and the operating status of the plasma purifier into a liquid crystal display signal through a decoder. The drive circuit module drives the liquid crystal display screen for display through an oscillation and modulation circuit. The display module realizes the liquid crystal display screen to display different data information by driving liquid crystal molecules and controlling the backlight.

[0026] In a specific embodiment, the liquid crystal display screen is an electro-optical imaging technology, which changes the molecular arrangement state in the liquid crystal through the action of an external electric field, thereby controlling the penetration or blocking of light, and finally forming an image display. Its specific working steps are as follows: 1. Display data processing: After the liquid crystal display screen receives the display data, it decodes and processes it through the processor inside the liquid crystal display screen, and converts the display data into a signal suitable for the liquid crystal display screen; 2. Drive circuit control: The internal drive circuit of the liquid crystal display controls the arrangement of the internal units of the LCD through the oscillation and modulation circuit, so that the pixels in different areas get the correct voltage and polarization direction, thereby displaying the required graphics, characters, numbers and other information; 3. Voltage drive liquid crystal molecules: Liquid crystal molecules are composed of liquid crystal molecules, which contain two layers of transparent electrodes. Applying different voltages on the electrodes will change the polarization angle between the electrode layers, thereby controlling the light transmittance of the liquid crystal display screen to display different information. At the same time, the backlight of the liquid crystal display screen is controlled by adjusting the brightness of the backlight, and then the brightness of the screen is controlled to adapt to the requirements of different ambient lighting, providing users with a better visual experience.

[0027] In the above embodiment, the neutral detergent is diluted with water in a ratio of neutral detergent: water = 1:3 to obtain a cleaning solution for the grid electrode plate and the high-efficiency filter, and the cleaning solution is covered on the grid electrode plate and the high-efficiency filter by soaking or applying, thereby cleaning the grid electrode plate and the high-efficiency filter.

[0028] In a specific embodiment, first, the neutral detergent is diluted with clean water, and the dilution ratio is neutral detergent: water = 1:3. The composition and concentration of the diluted detergent become milder, which can better protect the surface of the cleaned object and reduce the impact on the environment and personal safety; secondly, turn off the power of the plasma purifier and unplug the power plug, remove the grid electrode plate and the high-efficiency filter, and use a soft brush to evenly cover the surface of the grid electrode plate and the high-efficiency filter with the diluted neutral detergent or soak the grid electrode plate and the high-efficiency filter in the diluted neutral detergent for 30 minutes to 1 hour; then, take out the grid electrode plate and the high-efficiency filter, wash their surfaces with pure water, and dry them in the air or use a hair dryer to blow dry; finally, put the grid electrode plate and the high-efficiency filter back into the plasma purifier, check whether the cleaned part is dry before connecting the power, and ensure that the plasma purifier is in a dry environment.

[0029] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these specific embodiments are only illustrative, and those skilled in the art may omit, replace, and change the details of the above methods and systems in various ways without departing from the principles and essence of the present invention. For example, merging the above method steps so as to perform substantially the same functions in substantially the same manner to achieve substantially the same results is within the scope of the present invention. Therefore, the scope of the present invention is limited only by the appended claims.

Claims

1. A method for applying plasma air disinfection and purification technology in commercial refrigerators, characterized in that: The following steps are involved: Step 1: Choose and install a plasma purifier. According to the size of the commercial refrigerator, air circulation conditions and required purification effect, select a plasma purifier and install it at the air outlet of the commercial refrigerator. Step 2: Start and configure the parameters of the plasma purifier, start the plasma purifier using a start switch, and use a touch screen to input the parameters of the plasma purifier, the parameters of the plasma purifier including voltage, current, temperature and purification level; Step 3: generating plasma, using a high voltage electric field to generate an ionization effect to achieve the generation of plasma, wherein the plasma includes oxygen ions, free electrons and free radicals; Step 4: Adsorbing solid impurities in the air, using a solid filter to remove solid impurities in the air, the solid impurities include dust, microorganisms and food residues, the solid filter includes a pre-filter, a high-efficiency filter and a fan module, the fan module is arranged at the front end of the pre-filter, and the pre-filter is arranged at the front end of the high-efficiency filter; Step 5: decomposing harmful gases in the air, and decomposing the harmful gases in the air into harmless substances through redox reactions, wherein the harmful gases include chlorofluorocarbons, nitric oxide and sulfur dioxide; Step 6: The plasma purifier enters a standby state. An electronic control system is used to control the plasma purifier to enter a standby state. The electronic control system includes a data acquisition module, a data processing module, a control module and a data display module. The control module controls the plasma purifier to enter a standby state through a state control algorithm. The output end of the data acquisition module is connected to the input end of the data processing module, the output end of the data processing module is connected to the input end of the control module, and the output end of the control module is connected to the input end of the data display module. Step 7. Perform regular maintenance and use a neutral detergent to regularly soak and clean the grid electrode plate and high-efficiency filter of the plasma purifier to remove dust and dirt deposited on the surface.

2. The method for applying the plasma air disinfection and purification technology in a commercial refrigerator according to claim 1, characterized in that: The ionization effect dissociates oxygen molecules into oxygen ions, free electrons and free radicals through the action of a high-energy electric field. The working steps of generating plasma by the ionization effect are as follows: Step 1, generating a high-voltage electric field; the plasma purifier is connected to a socket of an external power supply through a plug, and the external power supply is started, the plasma purifier obtains electric energy, and the plasma purifier converts the low voltage of the external power supply into a high voltage through a transformer to generate a high-voltage electric field; Step 2, generating plasma; The plasma purifier generates an ionization effect through a high-voltage electric field, ionizing oxygen molecules in the air into oxygen ions, free electrons and free radicals. The chemical equation of the ionization effect is: Step 3, releasing ions; The plasma purifier generates positive ions and negative ions through an ionizing material loaded with strontium titanate to stabilize the charge environment in the air. The chemical equation for the ionizing material to generate positive ions and negative ions is: 。 3. The method for applying the plasma air disinfection and purification technology in a commercial refrigerator according to claim 1, characterized in that: The working method of the solid state filter includes the following steps: The S1 solid-state filter starts working after being powered on; The solid-state filter is provided with electric energy by an external power supply, and the solid-state filter is controlled to start working by a start switch; S2 external air enters the solid filter; The solid-state filter generates airflow through a fan module to draw external air into the filter, and controls the air flow by adjusting fan parameters, wherein the fan parameters include motor power, speed, wind pressure and air volume; S3 filters large particles in the air; The solid filter removes large particles in the air through a pre-filter to protect the high-efficiency filter. The large particles include food residues, sand and fibers. The pre-filter uses a metal mesh and sponge to form a barrier layer to filter out large particles in the air. S4 filters tiny particles in the air; the solid-state filter removes tiny particles in the air through a high-efficiency filter, the tiny particles include dust particles, PM2.5 and bacteria and viruses, the high-efficiency filter intercepts dust particles in the air through a screen, and the high-efficiency filter removes PM2.5 and bacteria and viruses in the air by electrostatic adsorption.

4. The method for applying the plasma air disinfection and purification technology in a commercial refrigerator according to claim 1, characterized in that: Under the conditions of high temperature of 200°C and ultraviolet irradiation, the harmful gas undergoes a redox reaction with oxygen ions, free electrons and free radicals to generate harmless hydrogen chloride, hydrogen fluoride, nitrogen dioxide ions and sulfate ions. The redox reaction is accelerated by adding metal catalysts and biological enzymes to accelerate the reaction rate and efficiency. The chemical equation of the redox reaction is: 。 5. The method for applying the plasma air disinfection and purification technology in a commercial refrigerator according to claim 1, characterized in that: The data acquisition module collects air quality data through an air quality detector, and the air quality data includes PM2.5 concentration, nitrogen monoxide concentration, sulfur dioxide concentration and chlorofluorocarbons. The data processing module smoothes the air quality data through a median filtering method to remove noise data. The data processing module corrects or adjusts the air quality data through zero drift correction to eliminate systematic errors and random errors.

6. The method for applying the plasma air disinfection and purification technology in a commercial refrigerator according to claim 1, characterized in that: The control module constructs a state control algorithm based on the PID control algorithm to realize the control of the working state of the plasma purifier. The operation steps of the state control algorithm are as follows: S01 obtains current air quality data and sets target values; The state control algorithm receives the air quality data processed by the data processing module through the RS485 communication port, and the state control algorithm inputs the target value of the air quality data into the state control algorithm by means of host computer command input; S02 calculates the deviation value; The state control algorithm constructs a deviation function based on the least squares method to calculate the deviation between the current air quality data and the set air quality data target value. The deviation function removes the error during air quality data collection by adding an error adjustment factor. The formula of the deviation function is: S03 calculates the PID control amount; The state control algorithm calculates the control amount through the PID control amount function, and the PID control amount function calculates the proportional control amount, the derivative control amount and the integral control amount according to the deviation between the current air quality data and the set air quality data target value. The formula of the PID control amount function is: S04 outputs control instructions; The state control algorithm uses programming statements to output the output of the PID calculation as a control instruction to the drive motor. The drive motor adjusts the operation and speed of the motor according to the control instruction to control the operating state of the plasma purifier. If the current air quality data exceeds the set target value, the plasma purifier enters the working state. If the current air quality data is lower than the set target value, the plasma purifier enters the standby state.

7. The method for applying the plasma air disinfection and purification technology in a commercial refrigerator according to claim 1, characterized in that: The data display module realizes the display of air quality data and the operating status of the plasma purifier through a liquid crystal display screen. The liquid crystal display screen includes a display data processing module, a drive circuit module and a display module. The data processing module converts the air quality data and the operating status of the plasma purifier into a liquid crystal display signal through a decoder. The drive circuit module drives the liquid crystal display screen for display through an oscillation and modulation circuit. The display module realizes the liquid crystal display screen displaying different data information by driving liquid crystal molecules and controlling the backlight.

8. The method for applying the plasma air disinfection and purification technology in a commercial refrigerator according to claim 1, characterized in that: The neutral detergent is diluted with water in a ratio of neutral detergent: water = 1:3 to obtain a cleaning solution for the grid electrode plate and the high-efficiency filter, and the cleaning solution is covered on the grid electrode plate and the high-efficiency filter by soaking or applying, thereby cleaning the grid electrode plate and the high-efficiency filter.

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