Atomizer anti-dry burning identification application and circuit

Abstract

The present invention discloses an anti-dry burning identification application for atomizers, which is specifically as follows: (1) the atomization circuit in the atomizer is used as a switch circuit, a sampling resistor is set on the branch of the switch circuit, and the circuit resonance signal is detected; (2) when the atomizer is turned on, the frequency of the atomizer sheet is scanned within the corresponding range, and the equivalent curve H(f) of the amplitude-frequency curve of the circuit is obtained; (3) after the frequency sweep is completed, the resonance point is taken to work, and the resonance feedback signal is continuously detected; (4) for the above-mentioned signal that fails to exceed the threshold Th, the process returns to the frequency sweep stage; (5) the initial state of the atomizer is calibrated. The present invention has the advantages of adding an inaccurate judgment backtracking judgment process during the atomization process to improve the accuracy of the judgment of lack of liquid; in addition, the atomization process can also be used to reduce the problem of liquid residue, which plays a significant role in the atomization process of the liquid medicine, and re-sweeping can also correct the current optimal atomization frequency to achieve the best atomization effect and reduce the power consumption.

Description

Technical Field

[0001] The invention relates to the field of medical atomizers, and in particular to an atomizer anti-dry burning identification application and a circuit thereof. Background Art

[0002] With the development of medical technology, atomization inhalation therapy is mainly used for the treatment of respiratory diseases. The method is to atomize the liquid medicine into tiny particles. The patient inhales the atomized medicine into the respiratory tract and lungs through breathing, which can directly reach the lesions, accelerate the action of the medicine, and achieve painless, rapid and effective treatment. However, the most common problem of the nebulizer during use is dry burning. The nebulizer will dry burn in the absence of liquid medicine. In order to prevent dry burning, the existing nebulizer generally uses an additional probe to identify whether the nebulizer liquid is atomized by an electrode sheet or a method of detecting the voltage threshold of the feedback resistor. When the atomizer is atomizing, whether there is liquid attached to the atomizer outlet will cause the current to change. Simply judging by the current threshold is not only easily affected by the consistency problem of the device and the atomizer circuit, but also affected by the current fluctuation caused by the state of the atomizer during atomization, resulting in misjudgment, causing the atomizer to dry burn and rupture, and then be absorbed by the human body and cause harm. Now a Chinese patent has been retrieved, with the patent number of 202010331473.5, the application date of April 24, 2020, and the patent name of the patent is atomizer anti-dry burning method, device, atomizer and storage medium. The patent requires sampling to determine the preset scanning curve model diagram and store it in the atomizer. The accuracy of the sampling scheme and the sampling model are related to the size of the sampling sample, and the size of the sampling sample will affect the capacity of the atomizer storage, and then affect the atomizer cost, and the actual operation process of the scheme has a certain degree of complexity. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a method for adding an inaccurate backtracking judgment process during the atomization process to improve the accuracy of liquid deficiency judgment; in addition, the atomization process can also be used to reduce the problem of liquid residue, which plays a significant role in the atomization process of the liquid medicine. Re-scanning the frequency can also correct the current optimal atomization frequency to achieve the best atomization effect and reduce power consumption of the atomizer anti-dry burning identification application and its circuit.

[0004] To achieve the above-mentioned purpose, the present invention provides an atomizer anti-dry burning identification application, wherein:

[0005] (1) The atomization circuit in the atomizer is used as a switch circuit, a sampling resistor is set on a branch of the switch circuit, and circuit resonance signal detection is performed;

[0006] (2) When the atomizer is turned on, the frequency of the atomizer is scanned within the corresponding range, and the equivalent curve H(f) of the amplitude-frequency curve of the circuit is obtained;

[0007] The above-mentioned process of scanning the frequency of the atomizer within the corresponding range is as follows:

[0008] First, take the coordinates of the resonance point Af, and find the minimum coordinates on both sides of the resonance point, denoted as Ast and Asp;

[0009] Then, calculate the horizontal distance from the resonance point Af to Ast and Asp, and find the point farthest from the resonance point, which is recorded as Aff;

[0010] Finally, calculate the coordinates of the resonance point Af and the point far from the resonance point Aff to make a straight line L(f), and calculate the size of the area enclosed by the equivalent curve H(f) of the amplitude-frequency curve and the straight line L(f), and take the area on the upper side of the straight line as positive;

[0011] By judging the area, it is possible to effectively judge whether the atomizer sheet is dry-burned. After testing, it is found that when water contacts the atomizer sheet, the impedance of the atomizer sheet will decrease, the Q value of the resonant circuit will decrease, the curve will protrude outward at the resonant frequency, and the curve will appear as a convex function; otherwise, the curve will be concave inward at the resonant frequency, and the curve will appear as a concave function.

[0012] In this embodiment, whether there is liquid in the medicine liquid cup is determined by calculating the positive or negative of the area enclosed by the curve and the straight line;

[0013] S = ∫(H(f)-L(f))df

[0014] (3) After the frequency sweep is completed, the resonant point is selected for operation, and the resonant feedback signal is continuously detected;

[0015] The above process of continuously detecting the resonant feedback signal is as follows:

[0016] First, when the solution is free of bubbles and the last drop of water adsorbed on the atomization port of the atomizer is atomized, the signal will drop significantly.

[0017] At this time, it is only necessary to perform a differential operation on the signal D(k)=f(k)-f(k-1) to remove the judgment interference caused by the baseline drift; by judging the variability of D(k), the dry burning of the atomizer can be completed;

[0018] Afterwards, if bubbles are generated in the solution during the atomization process, when the liquid is lower than the atomization port of the atomizer, a fluctuation signal will be formed on the atomizer, and the overall signal will slowly decrease; at this time, it is impossible to judge whether the atomizer is dry-burned by the variation of D(k); therefore, while performing the differential operation, the original signal is dynamically evaluated, the fluctuation of the signal is calculated, and the signal with a fluctuation exceeding a certain threshold Th is directly judged as a dry-burn of the atomizer; the fluctuation is evaluated using the SD of the interval sliding window;

[0019] Xk is the K-th window, D(k) is the k-th data, and w is the window width;

[0020] Calculate SD(Xk) to assess volatility;

[0021] (4) For the above signal that fails to exceed the threshold value Th, the process returns to the frequency sweep stage; the circuit is swept again to obtain the resonance point Af2; the dry burning of the atomizer is judged according to the process of step 2, and the frequency deviation calculation of the original resonance point Af and the new resonance point Af2 is added. When the frequency deviation exceeds the predetermined value PreF, it will be judged as dry burning; for the solution that cannot be judged to be in the form of bubbles, it can actually continue to be atomized. At this time, atomization is performed according to the new frequency Af2;

[0022] (5) Calibrate the initial state of the nebulizer;

[0023] Optionally, after the atomizer is produced, a water addition test can be performed. At this time, the atomizer automatically records the characteristic curve when the atomizer has water. When there is no water, the atomizer can be compared with the curve when there is water, and the difference in area can be calculated to determine the water shortage state of the atomizer.

[0024] Another object is to provide an atomizer anti-dry burning identification circuit, which includes a switch circuit connected to the atomizer sheet, and a sampling resistor module for detecting a circuit resonance signal connected to a branch of the switch circuit; the sampling resistor module includes a resonance control circuit and a feedback circuit respectively connected to the switch circuit; and a programmable logic device is provided on the resonance control circuit.

[0025] The beneficial effect of the present invention is that it has the function of adding a backtracking judgment process for inaccurate judgment during the atomization process to improve the accuracy of liquid shortage judgment; in addition, the atomization process can also be used to reduce the problem of liquid residue, which plays a significant role in the atomization process of the liquid medicine. Re-scanning can also correct the current optimal atomization frequency to achieve the best atomization effect and reduce the effect of power consumption. Since the circuit bandwidth and the resonance point offset are calculated using the resonance characteristic curve, and the bandwidth and frequency deviation variability are compared, the requirements for the circuit are reduced. The working curve is continuously sampled, and the volatility and variability of the signal are analyzed, combined with the characteristic curve analysis, the dry burning recognition ability of the atomization is improved and the residual liquid is reduced, and the solution used in the current solution is accurately judged. It is realized that the backtracking judgment process for inaccurate judgment is added during the atomization process to improve the accuracy of liquid shortage judgment; in addition, the atomization process can also be used to reduce the problem of liquid residue, which plays a significant role in the atomization process of the liquid medicine. Re-scanning can also correct the current optimal atomization frequency to achieve the best atomization effect and reduce the effect of power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a block diagram of the present invention;

[0027] Figure 2 A circuit diagram of the present invention;

[0028] Figure 3 It is a block diagram of the present invention.

[0029] Figure 4 is a curve diagram of Example 1 without dry burning;

[0030] Figure 5 is a curve diagram of dry-burning Example 2;

[0031] Figure 6 It is a curve diagram of Example 3 for determining the absence of bubbles;

[0032] Figure 7 This is a graph of Example 4 for determining the presence of bubbles. DETAILED DESCRIPTION

[0033] The invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] like Figure 1-3 As shown, an anti-dry burning identification application of an atomizer, wherein (1) the atomization circuit in the atomizer is used as a switch circuit, a sampling resistor is set on the branch of the switch circuit, and the circuit resonance signal is detected; (2) when the atomizer is turned on, the frequency of the atomizer sheet is scanned within a corresponding range, and the equivalent curve H(f) of the amplitude-frequency curve of the circuit is obtained;

[0035] The above-mentioned process of scanning the frequency of the atomizer within the corresponding range is as follows:

[0036] First, take the coordinates of the resonance point Af, and find the minimum coordinates on both sides of the resonance point, denoted as Ast and Asp;

[0037] Then, calculate the horizontal distance from the resonance point to Ast and Asp, and find the point farthest from the resonance point, which is recorded as Aff;

[0038] Finally, calculate the coordinates of the resonance point Af and the point far from the resonance point Aff to make a straight line L(f), and calculate the size of the area enclosed by the equivalent curve H(f) of the amplitude-frequency curve and the straight line L(f), and take the area on the upper side of the straight line as positive;

[0039] By judging the area, it is possible to effectively judge whether the atomizer sheet is dry-burned. After testing, it is found that when water contacts the atomizer sheet, the impedance of the atomizer sheet will decrease, the Q value of the resonant circuit will decrease, the curve will protrude outward at the resonant frequency, and the curve will appear as a convex function; otherwise, the curve will be concave inward at the resonant frequency, and the curve will appear as a concave function.

[0040] In this embodiment, whether there is liquid in the medicine liquid cup is determined by calculating the positive or negative of the area enclosed by the curve and the straight line;

[0041] S = ∫(H(f)-L(f))df

[0042] (3) After the frequency sweep is completed, the resonant point is selected for operation, and the resonant feedback signal is continuously detected;

[0043] The above process of continuously detecting the resonant feedback signal is as follows:

[0044] First, when the solution is free of bubbles and the last drop of water adsorbed on the atomization port of the atomizer is atomized, the signal will drop significantly.

[0045] At this time, it is only necessary to perform a differential operation on the signal D(k)=f(k)-f(k-1) to remove the judgment interference caused by the baseline drift; by judging the variability of D(k), the dry burning of the atomizer can be completed;

[0046] Afterwards, if bubbles are generated in the solution during the atomization process, when the liquid is lower than the atomization port of the atomizer, a fluctuation signal will be formed on the atomizer, and the overall signal will slowly decrease; at this time, it is impossible to judge whether the atomizer is dry-burned by the variation of D(k); therefore, while performing the differential operation, the original signal is dynamically evaluated, the fluctuation of the signal is calculated, and the signal with a fluctuation exceeding a certain threshold Th is directly judged as a dry-burn of the atomizer; the fluctuation is evaluated using the SD of the interval sliding window;

[0047] Xk is the K-th window, D(k) is the k-th data, and w is the window width;

[0048] Calculate SD(Xk) to assess volatility;

[0049] (4) For the above signal that fails to exceed the threshold value Th, the process returns to the frequency sweep stage; the circuit is swept again to obtain the resonance point Af2; the dry burning of the atomizer is judged according to the process of step 2, and the frequency deviation calculation of the original resonance point Af and the new resonance point Af2 is added. When the frequency deviation exceeds the predetermined value PreF, it will be judged as dry burning; for the solution that cannot be judged to be in the form of bubbles, it can actually continue to be atomized. At this time, atomization is performed according to the new frequency Af2;

[0050] (5) Calibrate the initial state of the nebulizer;

[0051] Optionally, after the atomizer is produced, a water addition test can be performed. At this time, the atomizer automatically records the characteristic curve when the atomizer has water. When there is no water, the atomizer can be compared with the curve when there is water, and the difference in area can be calculated to determine the water shortage state of the atomizer.

[0052] An atomizer anti-dry burning identification circuit includes a switch circuit connected to an atomizer sheet, and a sampling resistor module for detecting a circuit resonance signal is connected to a branch of the switch circuit; the sampling resistor module includes a resonance control circuit and a feedback circuit respectively connected to the switch circuit; and a programmable logic device is provided on the resonance control circuit.

[0053] When applied, the resonance characteristic curve is used to calculate the circuit bandwidth and resonance point offset, and the bandwidth and frequency deviation variability are compared, which reduces the requirements for the circuit. The working curve is continuously sampled, and the volatility and variability of the signal are analyzed in combination with the characteristic curve analysis to improve the atomization dry burning recognition ability and reduce residual liquid. At the same time, it has the ability to accurately judge the solution used normally in the current solution. It is realized that the inaccurate judgment backtracking judgment process is added during the atomization process to improve the accuracy of liquid shortage judgment; in addition, the atomization process can also be used to reduce the problem of liquid residue, which plays a significant role in the atomization process of the liquid medicine. Re-scanning can also correct the current optimal atomization frequency to achieve the best atomization effect and reduce power consumption.

[0054] Example 1 is a non-dry burning example

[0055] like Figure 4 As shown: The blue line is the swept-frequency voltage sampling curve (equivalent curve of amplitude-frequency characteristics). Determine the resonance point Af (the point with the highest voltage value, the same below). Determine the lowest point on both sides of the resonance point, Ast / Asp. In the above table, the distances from Ast and Asp to Af on the horizontal axis are equal, so take any point of Ast and Asp, take Ast in the above table, and make a straight line with Af, the orange line in the table. Calculate the area S1 enclosed by the blue curve and the orange straight line.

[0056] Obviously S1>0, so the atomizer is not dry-burned.

[0057] Example 2 is a dry burning example

[0058] like Figure 5 As shown: The blue line is the swept-frequency voltage sampling curve (equivalent curve of amplitude-frequency characteristics). Determine the resonance point Af (the point with the highest voltage value, the same below). Determine the lowest point on both sides of the resonance point, Ast / Asp. In the above table, Ast is farther than the distance from Asp to Af on the horizontal axis, so Ast and Af are taken as straight lines, the orange lines in the table. Calculate the area S2 enclosed by the blue curve and the orange straight line.

[0059] Obviously S2<0, so the atomizer is not dry-burned.

[0060] Example 3 is an example of determining if there is no bubble

[0061] like Figure 6As shown: The blue curve is the original differential curve D(f), which is offset 90 units upward along the y-axis. The orange curve is the original voltage sampling signal collected in real time. The signal is differentially processed to obtain the differential function D(f). During normal atomization, D(f) fluctuates within a certain range. When D(f) suddenly fluctuates continuously and becomes larger, the function is judged to have mutated. In the above table, after differential processing, during normal atomization, D(f) is concentrated in the range of ±2. When a mutation occurs, the instantaneous fluctuation of D(f) is in the range of 7 to -6, and the continuous fluctuation range becomes ±4. Therefore, it can be judged that the atomizer is short of liquid.

[0062] Example 4 is an example of determining whether there are bubbles

[0063] like Figure 7 As shown: The blue curve is the original differential curve D(f), which is offset 40 units upward along the y-axis. The orange curve is the original voltage sampling signal collected in real time. The signal is differentially processed to obtain the differential function D(f). During normal atomization, D(f) fluctuates within a certain range. When D(f) suddenly fluctuates continuously and becomes larger, it is determined that the function has mutated. In the above table, after differential processing, during normal atomization, D(f) is concentrated in a certain range and changes stably. When a mutation occurs, the instantaneous fluctuation of D(f) is in the range of 20 to -40, and the continuous fluctuation range is about 3 times the original range. From this, it can be determined that the contact point between the liquid medicine and the atomizer is in the shape of a bubble. At this time, atomization can be stopped. If atomization needs to continue, it is necessary to return to the frequency sweeping stage and start again.

[0064] The existing technology is compared with the Chinese patent, whose patent number is 202010331473.5, the application date is April 24, 2020, and the patent name is atomizer anti-dry burning method, device, atomizer and storage medium.

[0065] First, the above-mentioned existing patents require sampling to determine the preset scanning curve model diagram and store it in the atomizer. The accuracy of the sampling scheme and the sampling model are related to the size of the sampling sample, and the size of the sampling sample will affect the capacity of the atomizer storage device, thereby affecting the cost of the atomizer, and the actual operation process of the scheme has a certain degree of complexity. The technical solution of the present patent application is a solution in which the electrical parameters of the circuit components change when there is liquid medicine, resulting in a change in the resonance curve. The influence of the presence or absence of liquid medicine on the atomizer is consistent with the prior art, so the curve change is also consistent. Under the existing atomizer manufacturing technology, the influence of the presence or absence of water on the curve of different atomizers can be shown to be consistent. In particular, a calibration can be added, and water can be used for atomization once to record the effect model of the electrical parameters of the atomizer on the resonance curve of the circuit when there is water in the atomizer.

[0066] Secondly, the step of matching and judging the actual frequency sweep curve according to the preset frequency sweep curve includes: determining the first current value according to the actual frequency sweep curve; the first current value is the current value corresponding to the first frequency in the preset frequency range; determining the first predetermined value according to the current value corresponding to the first frequency in the preset frequency sweep curve, and comparing the first current value with the first predetermined value; if the first current value is greater than the first predetermined value, it is judged as mismatch. The first predetermined value of this patent is the maximum value in the sample. According to the test results, the current of the atomizer at the first current value when there is no water is smaller than the current value when there is water. Therefore, judging here that it is greater than the predetermined value as mismatch will only increase the misjudgment. The following is some test data. At the first current value, most of the data without liquid medicine is lower than that with liquid medicine. Therefore, according to the above logic, liquid medicine is more easily identified as dry burning without liquid.

[0067]

[0068] Third, if dry burning occurs according to the real-time current value, the step of executing dry burning protection includes: step S510, judging whether the real-time current value falls into the dry burning protection interval. The dry burning protection interval is the range interval of the current value flowing through the atomizer when the atomizer is in a non-dry burning state. If the real-time current value does not fall into the dry burning protection interval, step S600 is executed. If the current value flowing through the atomizer falls into the dry burning protection interval, dry burning does not occur; if it does not fall into the dry burning protection interval, dry burning occurs, and the controller executes dry burning protection at this time. If the real-time current value falls into the dry burning protection interval, it returns to step S400. In one embodiment, the real-time current value includes several current values ​​obtained according to a preset time. If dry burning occurs according to the real-time current value, the step of executing dry burning protection includes: if only a single real-time current value falls into the dry burning protection interval to judge whether dry burning occurs, misjudgment may occur, resulting in false triggering of dry burning protection. In order to improve the accuracy of dry burning detection, multiple real-time current values ​​are obtained according to the preset time for judgment. The preset time is a preset time range, for example, two or more real-time current values ​​are collected within 0.2S. In one embodiment, the time intervals between two adjacent collections may be equal or unequal. Step S520, determine whether each real-time current value does not fall into the dry burning protection interval. If the several real-time current values ​​collected within the preset time do not fall into the dry burning protection interval, it can be determined that the atomizer has dry burning. In one embodiment, if only the real-time current values ​​of no more than a preset proportion of the multiple real-time current values ​​collected fall into the dry burning protection interval, and the rest do not fall into the dry burning protection interval, it is considered that the atomizer has dry burning. If so, execute step S600. After determining that the atomizer has dry burning, the controller executes dry burning protection. In one embodiment, before executing the step of obtaining the real-time current value of the atomizer, it also includes: step S700, establishing a dry burning protection interval. The dry burning protection interval may be different under different atomizers, different operating frequencies or different atomizing liquid capacities, so it is necessary to establish a dry burning protection interval under the current working state. In one of the embodiments, a preset dry burning protection interval can also be used for detection. This solution uses a fixed interval method to determine whether the current is within the interval during the atomization process to determine dry burning. It can be seen from the embodiments of this solution that during the atomization process, the atomization current will have a baseline drift phenomenon, so the method of directly judging whether it falls within the fixed interval will cause misjudgment to a large extent. In addition, sample collection and sampling evaluation are required, which will inevitably be affected by the sample size.

[0069] The technical solution of this patent application uses a signal processing method and a differential operation to remove the baseline drift of the signal. In addition, this solution uses a variation point method, which only requires comparison of subsequent data with previous data, and uses standard deviation to calculate the volatility to determine the variation point, that is, the liquid-free dry-burning point. In addition, for liquids that can produce bubbles, this solution uses a volatility assessment solution to identify. In liquids that are prone to bubble generation, signal fluctuations will increase significantly. It is only necessary to test the distribution of fluctuations when the liquids with and without bubbles are close to dry-burning as a judgment condition. In addition, the technical solution of this patent application adds an inaccurate backtracking judgment process during the atomization process to improve the accuracy of liquid shortage judgment. In addition, this process can also be used to reduce the problem of liquid residue, which plays a significant role in the atomization process of the liquid medicine. Re-scanning can also correct the current optimal atomization frequency to achieve the best atomization effect and reduce power consumption.

[0070] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the invention.

Claims

1. A method for identifying an atomizer to prevent dry burning, wherein: The details are as follows: (1) The atomization circuit in the atomizer is used as a switch circuit, a sampling resistor is set on a branch of the switch circuit, and circuit resonance signal detection is performed; (2) When the atomizer is turned on, the frequency of the atomizer is scanned within the corresponding range, and the equivalent curve H(f) of the amplitude-frequency curve of the circuit is obtained; The above-mentioned process of scanning the frequency of the atomizer within the corresponding range is as follows: First, take the coordinates of the resonance point Af, and find the minimum coordinates on both sides of the resonance point, denoted as Ast and Asp; Then, calculate the horizontal distance from the resonance point Af to Ast and Asp, and find the point farthest from the resonance point, which is recorded as Aff; Finally, calculate the coordinates of the resonance point Af and the point far from the resonance point Aff to make a straight line L(f), and calculate the size of the area enclosed by the equivalent curve H(f) of the amplitude-frequency curve and the straight line L(f), and take the area on the upper side of the straight line as positive; By judging the area, it is possible to effectively judge whether the atomizer sheet is dry-burned. After testing, it is found that when water contacts the atomizer sheet, the impedance of the atomizer sheet will decrease, the Q value of the resonant circuit will decrease, the curve will protrude outward at the resonant frequency, and the curve will appear as a convex function; otherwise, the curve will be concave inward at the resonant frequency, and the curve will appear as a concave function. Determine whether there is liquid in the medicine cup by calculating the positive or negative value of the area enclosed by the curve and the straight line; S = ∫(H(f)-L(f))df (3) After the frequency sweep is completed, the resonant point is selected for operation, and the resonant feedback signal is continuously detected; The above process of continuously detecting the resonant feedback signal is as follows: When the solution is free of bubbles and the last drop of water adsorbed on the atomization port of the atomizer is atomized, the signal will drop significantly. At this time, it is only necessary to perform a differential operation on the signal D(k)=f(k)-f(k-1) to remove the judgment interference caused by the baseline drift; by judging the variability of D(k), the dry burning of the atomizer can be completed; During the atomization process, bubbles are generated in the solution, and the liquid is lower than the atomization port of the atomizer. A fluctuation signal will be formed on the atomizer, and the overall signal will slowly decrease. At this time, it is impossible to judge whether the atomizer is dry-burned by the above-mentioned variation of D(k). Therefore, while performing the differential operation, the original signal is dynamically evaluated, the fluctuation of the signal is calculated, and the signal with a fluctuation exceeding a certain threshold Th is directly judged as a dry-burn of the atomizer. The fluctuation is evaluated using the SD of the interval sliding window. Xk is the K-th window, D(k) is the k-th data, and w is the window width; Calculate SD(Xk) to assess volatility; (4) For signals that fail to exceed the threshold value Th, the process returns to the frequency sweep stage; the circuit is swept again to obtain the resonance point Af2; the dry burning of the atomizer is judged according to the process of step 2, and the frequency deviation calculation of the original resonance point Af and the new resonance point Af2 is added. When the frequency deviation exceeds the predetermined value PreF, it will be judged as dry burning; for the solution that cannot be judged to be in the form of bubbles, it can actually continue to be atomized. At this time, atomization is performed according to the new resonance point Af2; (5) Calibrate the initial state of the nebulizer; After the atomizer is produced, a water adding test is carried out. At this time, the atomizer automatically records the characteristic curve when the atomizer piece has water.

2. The method for identifying an atomizer against dry burning according to claim 1, characterized in that: In the above (5), when there is no water, the atomizer is compared with the curve when there is water, and the difference in area is calculated to determine the water shortage state of the atomizer.

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