A control method for adaptively adjusting the concentration of a sterilizing gas according to the size of a water flow and a sterilized water preparation system

Abstract

This invention provides a control method and a sterilizing water preparation system that adaptively adjust the concentration of sterilizing gas based on water flow rate, belonging to the field of water treatment sterilization technology. The method uses an audio sensor to sample the audio signal generated by the water flow in the gas path. After filtering and noise reduction, it determines whether there are effective water flow audio characteristics, thereby automatically controlling the start and stop of the sterilizing gas generator. Based on the frequency and / or amplitude characteristics of the audio signal, it adaptively adjusts the concentration of the sterilizing gas output by the generator, thus maintaining the concentration of the final sterilizing water within a reasonable and effective range. This invention employs a sliding window weighted filtering algorithm to improve control accuracy and also introduces a temperature sensor to achieve water temperature interlock control. While ensuring the sterilization effect of the sterilizing water, it also features economy and ease of operation. Furthermore, it achieves corrosion resistance through non-contact audio sensing, making it widely applicable to various sterilization application scenarios.

Description

Technical Field

[0001] This invention relates to the field of disinfection and sterilization technology, and in particular to a method for controlling the concentration of sterilizing gas and a system for preparing sterilizing water. Background Technology

[0002] Ozone water, as a disinfection and sterilization medium, has outstanding advantages: it not only has strong and rapid sterilization capabilities, but also releases oxygen upon decomposition, making it safe and without side effects. Ozone water is considered widely applicable in water treatment, air purification, food processing, medical disease control, biopharmaceuticals, and aquaculture. In daily life, ozone water is typically prepared by mixing tap water and ozone gas using a gas-water mixer. The tap water supply line and the ozone gas supply line are both connected to the gas-water mixer, and the outlet of the mixer is the ozone water outlet. However, existing ozone generators either cannot adjust the ozone concentration of the ozone water according to actual needs, or require manual operation to adjust the ozone concentration. Mechanical manual switches on the market are inconvenient to operate, have low adjustment precision, and are not very practical; while some pressure-sensitive switches are not durable and are easily corroded by ozone. Furthermore, water supply lines often experience pressure fluctuations, causing changes in water flow and thus fluctuations in the ozone concentration of the ozone water, ultimately resulting in the inability to obtain ozone water with a stable sterilization effect. Furthermore, some users find it difficult to easily match the ozone concentration with the current water flow rate when manually adjusting the water flow, causing significant inconvenience. This is especially problematic for children, as incorrect ozone concentration adjustments could potentially harm their health. In addition, the accuracy of ozone generator control in the industry is currently not high enough. Summary of the Invention

[0003] To address at least one of the aforementioned problems, the present invention provides a control method for adaptively adjusting the concentration of bactericidal gas based on the water flow rate, and a bactericidal water preparation system.

[0004] This invention is implemented using the following scheme: This invention proposes a control method for adaptively adjusting the concentration of bactericidal gas based on water flow rate, comprising the following steps: S1: The audio signal in the gas passage is sampled using an audio sensor; S2: Perform filtering and noise reduction processing on the sampled audio signal; S3: Based on the processed audio signal, determine whether the audio signal includes a valid water flow audio signal, and use this to determine whether to turn the sterilization gas generator on or off. S4: If in step S3 it is determined that the audio signal does not include a valid water flow audio signal, then the sterilization gas generator is turned off. If in step S3 it is determined that the audio signal includes a valid water flow audio signal, then the sterilization gas generator is started, and the signal characteristics of the processed audio signal are further acquired. The signal characteristics include at least one of frequency characteristics and amplitude characteristics. Based on the acquired signal characteristics, the water flow rate is determined. Based on the determined water flow rate, the concentration of sterilization gas generated by the sterilization gas generator is controlled. S5: Repeat steps S1-S4.

[0005] In one embodiment, step S2 involves filtering and noise reduction of the audio electrical signal, specifically including: Hardware filtering is applied to the audio electrical signal. A high-pass filter is set to filter out low-frequency vibration signal interference, and a low-pass filter is set to filter out high-frequency noise signal interference.

[0006] In one embodiment, in step S3 above, determining whether the processed audio signal includes a valid water flow audio signal specifically includes: Based on the audio signal sampled by the first timer, if the audio signal level is maintained continuously for a set number of times, the audio signal level is considered stable and valid; if the stable and valid audio signal level is high, the audio signal is determined to include a valid water flow audio signal; otherwise, it is not included.

[0007] In one embodiment, step S3 further includes: using sliding window filtering and two-level weighted comparison to judge the sampled audio signal in order to perform start-stop judgment of the sterilization gas generator.

[0008] In one embodiment, the sampled audio signal is subjected to sliding window filtering and two-level weighted comparison judgment, specifically including: according to the second timer, performing a weighted comparison between the number of valid high-level signals and the number of valid low-level signals of the sampled audio level signal, and generating a start record or a stop record based on the comparison result; The generated start or stop records are stored in the start sliding window cache or stop sliding window cache respectively; the sliding window address is accumulated in a loop; the proportion of start records in the start sliding window cache or stop records in the stop sliding window cache is compared with the threshold; if the threshold is exceeded, the action program for starting or stopping the sterilization gas generator is executed.

[0009] In one embodiment, step S4, controlling the concentration of the sterilizing gas generated by the sterilizing gas generator, specifically includes: Adjust the operating power of the sterilizing gas generator to control the concentration of the sterilizing gas generated by the sterilizing gas generator; and / or adjust the duty cycle of the pulse signal controlling the sterilizing gas generator to control the concentration of the sterilizing gas generated by the sterilizing gas generator.

[0010] In one embodiment, in step S4, a mapping table between the signal characteristics of the audio electrical signal and the concentration of the sterilizing gas is pre-established; based on the acquired signal characteristics and the pre-defined mapping table between the signal characteristics and the concentration of the sterilizing gas, the concentration of the sterilizing gas generated by the sterilizing gas generator is adjusted.

[0011] In one embodiment, step S1 further includes: sampling the water temperature signal using a temperature sensor; Step S2 also includes: filtering and noise reduction processing of the sampled water temperature signal; In step S3, the conditions for determining whether to turn the sterilization gas generator on or off also include: determining whether the water temperature value is within the preset water temperature range based on the water temperature signal; The above step S4 is replaced by step S40: If in step S3 it is determined that the audio signal does not include a valid water flow audio signal, or the water temperature value is not within the preset water temperature value range, then the sterilization gas generator is turned off. If in step S3 it is determined that the audio signal includes a valid water flow audio signal and the water temperature is within a preset water temperature range, then the sterilization gas generator is started, and the signal characteristics of the processed audio signal are further acquired. The signal characteristics include at least one of frequency characteristics and amplitude characteristics. Based on the acquired signal characteristics, the water flow rate is determined. Based on the determined water flow rate, the concentration of sterilization gas generated by the sterilization gas generator is controlled. The present invention also proposes a sterilizing water preparation system, including a sterilizing gas preparation host, a gas-liquid mixer, an audio sensor, a gas pipe, and a water supply system. The sterilizing gas preparation host includes a sterilizing gas generator and a control module. The control module is characterized in that it is used to execute the control method described in the preceding claim, which adaptively adjusts the concentration of sterilizing gas according to the water flow rate, based at least on the audio signal from the audio sensor, and outputs sterilizing water containing sterilizing gas of a controlled adjusted concentration through the water supply system.

[0012] In one embodiment, the sterilizing gas generating unit includes an air inlet channel and an exhaust channel, the air inlet channel and the exhaust channel being respectively connected to both ends of the sterilizing gas generator; the audio sensor is disposed in the air inlet channel; and / or, The sterilization gas preparation host is an ozone preparation host, and the sterilization gas generator is an ozone generator.

[0013] The technical solution provided by this invention has the following technical effects: This invention provides a control method and a sterilizing water preparation system that adaptively adjust the concentration of sterilizing gas based on water flow rate, belonging to the field of water treatment sterilization technology. The method uses an audio sensor to sample the audio signal generated by the water flow in the gas path. After filtering and noise reduction, it determines whether there are effective water flow audio characteristics, thereby automatically controlling the start and stop of the sterilizing gas generator. Based on the signal characteristics of the audio signal, it adaptively adjusts the concentration of the sterilizing gas output by the generator, thus maintaining the concentration of the final sterilizing water within a reasonable and effective range. This invention employs a sliding window weighted filtering algorithm to improve control accuracy and also introduces a temperature sensor to achieve water temperature interlock control. While ensuring the sterilization effect of the sterilizing water, it also features economy and ease of operation. Furthermore, it achieves corrosion resistance through non-contact audio sensing, making it widely applicable to various sterilization application scenarios. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the bactericidal water preparation system according to the first embodiment of the present invention; Figure 2 This is a schematic diagram of the main unit of the sterilization water preparation system according to the first embodiment of the present invention; Figure 3 This is a full sectional view of the gas-liquid mixer according to the first embodiment of the present invention; Figure 4 This is a flowchart of the audio signal filtering process according to the first embodiment of the present invention; Figure 5 This is a flowchart of the sterilization gas concentration control method according to the first embodiment of the present invention; Figure 6 This is a flowchart of step S3 in the sterilization gas concentration control method of the first embodiment of the present invention, which is a process for determining whether the audio signal includes a valid water flow audio signal. Figure 7 This is a flowchart of step S3 of the sterilization gas concentration control method in the first embodiment of the present invention, which describes the process of using sliding window filtering and two-level weighted comparison to judge the sampled audio signal; Figure 8 This is a schematic diagram of the bactericidal water preparation system under another embodiment of the first embodiment of the present invention; Figure 9 This is a schematic diagram of the bactericidal water preparation system according to the second embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of each module of the host unit in the sterilization water preparation system according to the third embodiment of the present invention; Figure 11 This is a schematic diagram of the main unit of the bactericidal water preparation system according to the fourth embodiment of the present invention. Detailed Implementation

[0015] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0016] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0017] Example 1 Reference Figures 1-7 This embodiment provides a sterilization water preparation system, including a sterilization gas preparation host 10, a gas-liquid mixer 20, a faucet 30, an air pipe 40, a water pipe 50, and a sterilization water pipe 60. The sterilization gas preparation host 10 includes a control module 11, a sterilization gas generator 12, an audio sensor 13, a power module 14, a display module 15, an air intake channel 16, and an exhaust channel 17. The air intake channel 16 and the exhaust channel 17 are respectively connected to the two ends of the sterilization gas generator 12. The sterilization gas generator 12 can be a reactive gas generator, or it can be a plasma generator or an ozone generator. The reactive gas generator is used to ionize the oxygen or oxygen-containing air supplied by the air intake channel 16 to generate reactive sterilization gases such as ozone, superoxide anions, active free radicals, and negative oxygen ions, and output them through the exhaust channel 17.

[0018] Reference Figure 3 The gas-liquid mixer 20 is a Venturi effect tube, having a liquid inlet 21, a gas inlet 22, and a gas-liquid mixing outlet 23. Further reference... Figure 1 as well as Figure 2 The liquid inlet 21 of the gas-liquid mixer 20 is connected to a water pipe 50, and the gas inlet 22 is connected to one end of a gas pipe 40. The other end of the gas pipe 40 is connected to the gas outlet 17 of the sterilizing gas generating unit 10. The gas-liquid mixing outlet 23 of the gas-liquid mixer 20 is connected to a faucet 30 via a sterilizing water pipe 60. When water flows through the gas-liquid mixer 20 in the water pipe 50, a negative pressure is generated at the gas inlet 22 due to the Venturi effect, thus creating a negative pressure gas pipe 40. This allows the sterilizing gas generated by the sterilizing gas generator 12 to be drawn into the gas-liquid mixer 20, where it is thoroughly mixed with water and other liquids to form sterilizing water. This sterilizing water is then output to the faucet 30 via the gas-liquid mixing outlet 23 and the sterilizing water pipe 60 for use. The gas-liquid mixer 20 is a known technology and will not be described in detail here.

[0019] The power module 14 is connected to the control module 11 and the display module 15, etc., to supply power to these components. The power module 14 may include an AC transformer power supply or a DC transformer power supply. The control module 11 is connected to the sterilizing gas generator 12. In this embodiment, the sterilizing gas generator 12 is exemplified as an ozone generator, the core of which includes a high-voltage discharge component. The control module 11 is used to control the working state of the high-voltage discharge component of the sterilizing gas generator 12, such as discharging or stopping, thereby controlling whether sterilizing gas is generated. The discharge component of the sterilizing gas generator 12 can generate a high-voltage discharge, thereby ionizing oxygen in the air into ozone gas, etc. Ozone and oxygen have different solubilities in solvent media. For example, in water solvent, the solubility of ozone is more than 10 times that of oxygen, so ozone gas can quickly dissolve in water to form sterilizing water. In other applications, the sterilizing gas generator 12 may also be a plasma generator or an active oxygen generator, etc. The display module 15 can be used to display the concentration of sterilizing gases, such as ozone concentration, and information such as water temperature and flow rate, so that users can easily obtain the status of water use.

[0020] Although this embodiment uses a faucet 30 pipe as an example for illustration, it is not limited thereto. This sterilizing water preparation system can also be used in the water supply pipes of washing machines or bathroom fixtures to prepare sterilizing water for use, for example. Figure 8 The image shows a sterilization water preparation system applied to the shower head water path 80.

[0021] Reference Figure 1 as well as Figure 2 In this embodiment, the gas-liquid mixer 20 is located below the countertop, and for aesthetic reasons, the sterilization gas generator 10 is typically positioned below the faucet 30. After water usage ceases, water in the faucet 30 and its pipes may flow backward along the sterilization water pipe 60 due to gravity, gradually seeping into the sterilization gas generator 10 via the gas pipe 40, causing damage to the generator 10. This problem can be solved by adding a one-way valve to the gas pipe 40 and / or the sterilization water pipe 60.

[0022] Reference Figure 1 as well as Figure 2The intake channel 16, exhaust channel 17, air pipe 40, and gas inlet 22 form a gas passage. An audio sensor 13 is located within the gas passage; specifically, the audio sensor 13 can be located on the side wall of the gas passage or inside the gas passage. In this embodiment, the audio sensor 13 is located on the side wall of the intake channel 16, resulting in more accurate audio sampling and achieving adaptive flow control through non-contact audio sensing. Compared to traditional pressure / flow sensor solutions, it features corrosion resistance, high reliability, and high control accuracy. Regarding the specific installation method of the audio sensor 13, it can be installed within the housing of the sterilization gas preparation host 10 or integrated onto the circuit board of the sterilization gas preparation host 10. When liquids such as water pass through the gas-liquid mixer 20, under the influence of the Venturi effect, they mix with the sterilization gas, generating audio signals with frequencies ranging from tens to thousands of hertz. These audio signals are transmitted through the gas passage and captured by the audio sensor 13 located on the side wall, causing the audio sensor 13 to generate an audio signal. The audio sensor 13 is electrically connected to the control module 11. The control module 11 can sample the audio signal through the audio sensor 13, and perform filtering, noise reduction, amplification, and other processing on the sampled audio signal. Based on the processed audio signal, it determines whether the user has turned on the water tap 30 or other water-using equipment. If the control module 11 determines that the user has turned on the water-using equipment, it automatically controls the sterilizing gas generator 12 to start according to the preset sterilizing gas concentration value to generate sterilizing gas, thereby producing sterilized water for use.

[0023] However, existing sterilizing gas generators typically produce sterilizing gases at fixed concentrations, failing to automatically adjust the concentration according to actual needs. This leads to fluctuations in the concentration of the sterilizing water due to unstable water flow, resulting in inconsistent sterilization effects. Therefore, this embodiment proposes a control method that adaptively adjusts the sterilizing gas concentration based on water flow rate. This method automatically adjusts the concentration of the sterilizing gas produced by the generator according to the water flow rate, maintaining the concentration of the sterilizing water within a reasonable and effective range to ensure its sterilization effect.

[0024] In this embodiment, refer to Figure 1 , Figure 2 as well as Figure 4 The control module 11 in the sterilization gas preparation host 10 is used to execute a control method that adaptively adjusts the concentration of sterilization gas according to changes in water flow rate, based at least on the audio signal from the audio sensor 13, including the following steps: S1: The audio signal in the gas passage is sampled by the audio sensor 13; S2: The sampled audio signal is filtered and noise-reduced. In the above embodiment, this can be achieved through the high-pass filter 111 and low-pass filter 112 of the control module 11 of the sterilization gas preparation host 10, such as... Figure 5 As shown; the order of high-pass filter 111 and low-pass filter 112 can be interchanged; in other embodiments, software algorithms are also used for filtering and noise reduction. S3: Based on the processed audio signal, determine whether the audio signal includes a valid water flow audio signal, and use this to determine whether to turn the sterilization gas generator 12 on or off; S4: If in step S3 it is determined that the audio signal does not include a valid water flow audio signal, then the sterilization gas generator 12 is turned off. If in step S3 it is determined that the audio signal includes a valid water flow audio signal, then the sterilizing gas generator 12 is started, and the signal characteristics of the processed audio signal are further acquired. The signal characteristics include at least one of frequency characteristics and amplitude characteristics. Based on the acquired signal characteristics, the water flow rate is determined. Based on the determined water flow rate, the concentration of sterilizing gas generated by the sterilizing gas generator 12 is controlled.

[0025] S5: Repeat steps S1-S4.

[0026] The sterilizing gas concentration control method provided in this embodiment samples the audio signal generated by the water flow in the gas path through an audio sensor. After filtering and noise reduction, it determines whether there are effective water flow audio characteristics, thereby automatically controlling the start and stop of the sterilizing gas generator 12. Based at least on the frequency and / or amplitude characteristics of the audio signal, it adaptively adjusts the concentration of the sterilizing gas output by the sterilizing gas generator 12, thereby maintaining the concentration of the final sterilized water within a reasonable and effective range. While ensuring the sterilization effect of the sterilized water, it is also economical and easy to operate, and has high control accuracy, making it widely applicable to various sterilization application scenarios.

[0027] In step S4 above, controlling the concentration of the sterilizing gas generated by the sterilizing gas generator 12 specifically includes: The operating power of the sterilizing gas generator 12 is adjusted to control the concentration of the sterilizing gas generated by the generator 12; and / or, the duty cycle of the pulse signal controlling the sterilizing gas generator 12 is adjusted to control the concentration of the sterilizing gas generated by the generator 12. This combination of methods improves the accuracy of the sterilizing gas concentration adjustment and expands the adjustment range of the sterilizing gas concentration.

[0028] Adjust the operating power of the sterilizing gas generator 12, or more specifically, adjust the operating voltage of the sterilizing gas generator 12, in order to control the concentration of the sterilizing gas generated by the sterilizing gas generator 12.

[0029] In step S2 above, the audio electrical signal is filtered and noise-reduced, specifically including: Hardware filtering of audio electrical signals, such as Figure 4 As shown, a high-pass filter 111 is configured to filter out low-frequency vibration signal interference; a low-pass filter 112 is configured to filter out high-frequency noise signal interference, such as ambient music. The high-pass filter 111 and the low-pass filter 112 can also be simplified to be implemented using a single band-pass filter.

[0030] In step S3 above, based on the processed audio signal, it is determined whether the audio signal includes a valid water flow audio signal, specifically including: Reference Figure 6 Based on the audio signal sampled by the first timer, if the audio signal level is maintained continuously for a set number of times, the audio signal level is considered stable and valid; if the stable and valid audio signal level is high, the audio signal is considered to include a valid water flow audio signal; otherwise, it is not. The first timer is, for example, a 300-microsecond timer.

[0031] Step S3 further includes: using sliding window filtering and two-level weighted comparison to judge the sampled audio signal in order to perform start-stop judgment of the sterilization gas generator 12.

[0032] More specifically, refer to Figure 7 According to the second timer (the second timer is a 50-millisecond timer in this embodiment), the sampled audio level signal is compared with the number of high-level effective times and the number of low-level effective times, and a start record or a stop record is generated based on the comparison result. The generated start or stop records are stored in the start sliding window cache or stop sliding window cache respectively; the sliding window address is accumulated in a loop; the proportion of start records in the start sliding window cache or stop records in the stop sliding window cache is compared with the threshold; if the threshold is exceeded, the action program for starting or stopping the sterilization gas generator 12 is executed.

[0033] By using sliding window filtering and two-level weighted comparison to judge the sampled audio signal, the control accuracy can be improved. This is used to execute the start and stop judgment of the sterilization gas generator 12, which can minimize noise interference, has strong anti-interference ability, and greatly improves the accuracy of judgment.

[0034] In this embodiment, the gas passage is a negative pressure gas passage, rather than sending air in through a positive pressure air pump, thereby eliminating the noise effect of the air pump and making the judgment result more accurate.

[0035] Furthermore, after a certain period of operation or experimentation, a mapping table between the signal characteristics of the audio electrical signal and the concentration of the bactericidal gas can be pre-established in step S4. Thus, in step S4, the concentration of the bactericidal gas generated by the bactericidal gas generator 12 can be controlled directly based on the mapping table between the signal characteristics and the concentration of the bactericidal gas without judging the water flow rate.

[0036] That is, in step S4, the concentration of sterilizing gas generated by sterilizing gas generator 12 is adjusted according to the acquired signal characteristics and based on the preset mapping table of the relationship between signal characteristics and sterilizing gas concentration.

[0037] This method can more quickly and accurately adjust the concentration of the sterilizing gas generated by the sterilizing gas generator 12 according to the changes in water flow, thereby maintaining the concentration of the final sterilizing water within a reasonable and effective range to ensure the sterilization effect of the sterilizing water.

[0038] Example 2 See Figure 9 The layout of the air pipe and gas-liquid mixer in this embodiment differs from that in Embodiment 1. In this embodiment, the gas-liquid mixer 20a is located at the outlet of the faucet 30a, and the air pipe 40 extends to the tabletop and is connected to the gas inlet of the gas-liquid mixer 20a. This achieves complete separation of the water and air paths, completely preventing liquid from seeping into the sterilization gas preparation host 10 and significantly improving equipment safety. All other parts not mentioned in this embodiment are consistent with Embodiment 1 and will not be repeated here.

[0039] Example 3 See Figure 10 The pipe layout in this embodiment differs from that in Embodiment 1, and this embodiment is a further improvement upon Embodiment 1. In this embodiment, both the air pipe 40 and the water pipe 50 extend into the body of the faucet 30b, forming a "pipe-in-pipe" structure. The gas-liquid mixer 20b is located at the outlet of the faucet 30b, thereby achieving complete separation of the water and air paths. This completely prevents liquid from seeping into the sterilization gas preparation host 10a, significantly improving equipment safety. In addition, a temperature sensor 70 is added in the water path for monitoring the water temperature. The temperature sensor 70 is electrically connected to the control module 11. Other parts not mentioned are consistent with Embodiment 1 and will not be repeated here.

[0040] Because the solubility of ozone and other bactericidal gases in water is temperature-dependent, when the temperature exceeds a certain range, such as above 60°C, the solubility of ozone and other bactericidal gases in water decreases significantly. This results in ineffective disinfection of the water, and the ozone and other bactericidal gases can easily escape directly from the water supply system, potentially harming the human respiratory system. Therefore, in this embodiment, the bactericidal gas generator 12 is shut off when the water temperature exceeds a certain range to avoid ineffective waste and reduce harm to human health.

[0041] Specifically, in this embodiment, a control method for adaptively adjusting the concentration of bactericidal gas according to the water flow rate is provided, including the following steps: S10: The audio signal in the gas passage is sampled by the audio sensor 13, and the water temperature signal is sampled by the temperature sensor 70; S20: Performs filtering and noise reduction processing on the sampled audio signal and water temperature signal; S30: Based on the processed audio signal, determine whether the audio signal includes a valid water flow audio signal, and based on the water temperature signal, determine whether the water temperature value is within the preset water temperature value range, and thereby determine whether to turn the sterilization gas generator 12 on or off. S40: If in step S30 it is determined that the audio signal does not include a valid water flow audio signal, or the water temperature value is not within the preset water temperature value range, then the sterilization gas generator 12 is turned off. If in step S30 it is determined that the audio signal includes a valid water flow audio signal and the water temperature is within a preset water temperature range, then the sterilizing gas generator 12 is started, and the signal characteristics of the processed audio signal are further acquired. The signal characteristics include at least one of frequency characteristics and amplitude characteristics. Based on the acquired signal characteristics, the water flow rate is determined. Based on the determined water flow rate, the concentration of sterilizing gas generated by the sterilizing gas generator 12 is controlled.

[0042] S50: Repeat steps S10-S40.

[0043] The control method for adaptively adjusting the concentration of bactericidal gas according to the water flow rate in this embodiment is consistent with the method in Embodiment 1, and will not be repeated here.

[0044] The method for controlling the concentration of bactericidal gas according to the water flow rate provided in this embodiment can shut down the bactericidal gas generator 12 when the water temperature exceeds a certain range, thereby achieving water temperature interlock control. This avoids energy waste caused by the gas dissolution rate of bactericidal gas in the water not meeting the standard, and at the same time, it can prevent the release of bactericidal gases such as ozone that are not dissolved in water and cause harm to human health.

[0045] Example 4 See Figure 11 This embodiment is a further improvement on embodiment 3. The communication method between the temperature sensor 70b and the control module 11 in this embodiment is different from that in embodiment 3. In this embodiment, the sterilization gas preparation host 10b also includes a wireless module 18, and the control module 11 communicates with the temperature sensor 70b through the wireless module 18.

[0046] In this embodiment, the temperature sensor 70b is wirelessly connected to the control module 11. Using wireless communication allows users greater freedom in choosing the installation locations of the sterilization gas generator 10b and the water flow sensor 70b. The wireless communication method can be selected as 315 MHz / 433 MHz single-wire communication or bidirectional communication functions such as 2.4G and BLE. Furthermore, the temperature sensor 70b can have a built-in lithium battery for power supply.

[0047] In addition, see Figure 11 In this embodiment, a wireless control device 90 is also included. The wireless control device 90 can be a wireless remote control or a wall-mounted control box, etc. The wireless control device 90 includes a control MCU 91, a second display module 92, a second wireless module 93, and a touch module 94. The second display module 92, the second wireless module 93, and the touch module 94 are electrically connected to the control MCU 91, which is used to control and coordinate the operation of each component. The second wireless module 93 and the wireless module 18 are wirelessly connected. The wireless communication method can be selected as 315 MHz / 433 MHz single-wire communication or 2.4G and BLE bidirectional communication functions. In this embodiment, the second wireless module 93 and the wireless module 18 are connected in a bidirectional wireless communication manner. Using the bidirectional communication method, the working status and working parameters of the sterilizing gas preparation host 10b can be transmitted back to the second display module 92 of the wireless control device 90 to display working parameters and working status such as water flow rate and sterilizing gas concentration, and can display the working status and working parameters of the sterilizing gas preparation host 10b with eye-catching patterns.

[0048] The wireless control device 90 can receive control commands input by the user through the touch module 94, and transmit the control commands to the sterilization gas preparation host 10b through the second wireless module 93, thereby remotely controlling the working status or working parameters of the sterilization gas preparation host 10b, such as remotely controlling the switch of the sterilization gas preparation host 10b or adjusting the concentration of sterilization gas, making control more convenient.

[0049] All other parts not mentioned in this embodiment are the same as in Embodiment 3, and will not be repeated here.

[0050] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A control method for adaptively adjusting the concentration of bactericidal gas based on water flow rate, characterized in that, Includes the following steps: S1: The audio signal in the gas passage is sampled using an audio sensor; S2: Perform filtering and noise reduction processing on the sampled audio signal; S3: Based on the processed audio signal, determine whether the audio signal includes a valid water flow audio signal, and use this to determine whether to turn the sterilization gas generator on or off. S4: If in step S3 it is determined that the audio signal does not include a valid water flow audio signal, then the sterilization gas generator is turned off. If in step S3 it is determined that the audio signal includes a valid water flow audio signal, then the sterilization gas generator is started, and the signal characteristics of the processed audio signal are further acquired. The signal characteristics include at least one of frequency characteristics and amplitude characteristics. Based on the acquired signal characteristics, the water flow rate is determined. Based on the determined water flow rate, the concentration of sterilization gas generated by the sterilization gas generator is controlled. S5: Repeat steps S1-S4.

2. The control method according to claim 1, characterized in that: In step S2, the audio electrical signal is filtered and noise-reduced, specifically including: Hardware filtering is applied to the audio electrical signal. A high-pass filter is set to filter out low-frequency vibration signal interference, and a low-pass filter is set to filter out high-frequency noise signal interference.

3. The control method according to claim 1, characterized in that: In step S3 above, based on the processed audio signal, it is determined whether the audio signal includes a valid water flow audio signal, specifically including: Based on the audio signal sampled by the first timer, if the audio signal level is maintained continuously for a set number of times, the audio signal level is considered stable and valid; if the stable and valid audio signal level is high, the audio signal is determined to include a valid water flow audio signal; otherwise, it is not included.

4. The control method according to claim 3, characterized in that: Step S3 further includes: using sliding window filtering and two-level weighted comparison to judge the sampled audio signal in order to perform start-stop judgment of the sterilization gas generator.

5. The control method according to claim 4, characterized in that: The sampled audio signal is filtered using a sliding window and a two-level weighted comparison. Specifically, according to the second timer, the sampled audio level signal is compared with the number of valid high-level signals and the number of valid low-level signals, and a start record or a stop record is generated based on the comparison result. The generated start or stop records are stored in the start sliding window cache or stop sliding window cache respectively; the sliding window address is accumulated in a loop; the proportion of start records in the start sliding window cache or stop records in the stop sliding window cache is compared with the threshold; if the threshold is exceeded, the action program for starting or stopping the sterilization gas generator is executed.

6. The control method according to claim 1, characterized in that: In step S4, controlling the concentration of the sterilizing gas generated by the sterilizing gas generator specifically includes: Adjust the operating power of the sterilizing gas generator to control the concentration of the sterilizing gas generated by the sterilizing gas generator; and / or adjust the duty cycle of the pulse signal controlling the sterilizing gas generator to control the concentration of the sterilizing gas generated by the sterilizing gas generator.

7. The control method according to claim 1, characterized in that: In step S4, a mapping table between the signal characteristics of the audio electrical signal and the concentration of the sterilizing gas is established; based on the acquired signal characteristics and the preset mapping table between the signal characteristics and the concentration of the sterilizing gas, the concentration of the sterilizing gas generated by the sterilizing gas generator is adjusted.

8. The control method according to claim 1, characterized in that: Step S1 also includes: sampling the water temperature signal using a temperature sensor; Step S2 also includes: filtering and noise reduction processing of the sampled water temperature signal; In step S3, the conditions for determining whether to turn the sterilization gas generator on or off also include: determining whether the water temperature value is within the preset water temperature range based on the water temperature signal; The above step S4 is replaced by step S40: If in step S3 it is determined that the audio signal does not include a valid water flow audio signal, or the water temperature value is not within the preset water temperature value range, then the sterilization gas generator is turned off. If in step S3 it is determined that the audio signal includes a valid water flow audio signal and the water temperature is within the preset water temperature range, then the sterilization gas generator is started, and the signal characteristics of the processed audio signal are further acquired. The signal characteristics include at least one of frequency characteristics and amplitude characteristics. Based on the acquired signal characteristics, the water flow rate is determined. Based on the determined water flow rate, the concentration of sterilization gas generated by the sterilization gas generator is controlled.

9. A sterilization water preparation system, comprising a sterilization gas preparation host, a gas-liquid mixer, an audio sensor, a gas pipe, and a water supply system, wherein the sterilization gas preparation host includes a sterilization gas generator and a control module, characterized in that, The control module is used to execute the control method as described in any one of claims 1-8, which adaptively adjusts the concentration of the bactericidal gas according to the water flow rate, based at least on the audio signal from the audio sensor, and outputs bactericidal water containing the bactericidal gas with the controlled adjusted concentration through the water supply system.

10. The sterilization water preparation system according to claim 9, characterized in that: The sterilizing gas generating unit includes an air inlet channel and an exhaust channel, which are respectively connected to both ends of the sterilizing gas generator; the audio sensor is located in the air inlet channel; and / or, The sterilization gas preparation host is an ozone preparation host, and the sterilization gas generator is an ozone generator.

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