Method and device for precisely adjusting atomization amount of ultrasonic humidifier

Abstract

The application discloses a method and device for precisely adjusting atomization quantity of an ultrasonic humidifier, and relates to the technical field of ultrasonic humidification atomization and air conditioning. The method comprises the following steps: S1, supplying power to E transducers in the ultrasonic humidifier one by one, and the atomization quantity of the ultrasonic humidifier increases with the increase of the number of the powered transducers until all the E transducers are powered; S2, after all the E transducers in the ultrasonic humidifier are powered, gradually increasing the power supply voltage of the transducers, and the atomization quantity of the ultrasonic humidifier increases with the increase of the power supply voltage until the power supply voltage increases to a nominal value, at which time the atomization quantity of the ultrasonic humidifier reaches the nominal value. The application realizes the precise adjustment of the atomization quantity of the ultrasonic humidifier by using the coupling strategy of the number grading control of the transducers and the power supply voltage adjustment of the transducers.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic humidification and atomization technology and air conditioning technology, and in particular to a method and apparatus for precisely adjusting the atomization amount of an ultrasonic humidifier. Background Technology

[0002] Ultrasonic humidifiers are widely used in industrial plants due to their compact structure, small footprint, easy mobility, low energy consumption, simple maintenance, and low operating costs. Ultrasonic humidification is a mechanical atomization method. It uses a transducer to convert high-frequency oscillating electrical energy into high-frequency vibrations of a diaphragm. Driven by the diaphragm, water overcomes its own surface tension, producing fine atomized particles. This mist is then pressurized by a fan and diffused into the air or air ducts, absorbing heat from the air and forming water vapor, thus humidifying the air. In other words, the amount of atomization ultimately determines the humidification output, which in turn depends on the amount of effective mechanical work done by the transducer's vibrations.

[0003] Furthermore, during atomization humidification, the fine water particles evaporate, absorbing heat from the air without requiring additional energy or introducing any latent heat, making it an isenthalpic humidification process. Unlike steam humidification, which introduces a large amount of latent heat, ultrasonic humidification, as an isenthalpic process, is more suitable for the needs of precision environmental control scenarios. It can greatly reduce the amount of cooling required to offset the latent heat of steam, thus reducing equipment investment costs and operating energy consumption.

[0004] However, in industries requiring precise control of humidification, such as walk-in environmental rooms, air conditioning performance laboratories, and automotive environmental laboratories, ultrasonic humidification technology is rarely used. It is merely used as a supplement to steam humidification, failing to leverage its energy-saving advantages. The main reason for this is that existing ultrasonic humidification technologies and products cannot meet the demands for precise adjustment.

[0005] Conventional industrial ultrasonic humidifiers typically have a single unit humidification capacity of 5-60 kg / h. They contain multiple atomizing plates, each generally composed of 6-10 transducers. During humidification, the number of atomizing plates operating in stages determines the energy value of the high-frequency vibrations in the water, ultimately controlling the atomization rate. Considering that each transducer's atomization rate is 300-900 g / h, the atomization rate of a single atomizing plate is between 2000-8000 g / h. The atomization rate of a single atomizing plate determines the minimum control increment for humidification adjustment. This falls far short of the precise adjustment performance required for applications such as environmental laboratories, severely limiting the market for ultrasonic humidifiers in these fields.

[0006] In conclusion, it is essential to develop an economical and reliable method for precisely adjusting the atomization volume of ultrasonic humidifiers, which can greatly expand the application range of ultrasonic humidifiers. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the present invention provides a method for precisely adjusting the atomization amount of an ultrasonic humidifier. By utilizing a coupling strategy of graded control of the number of transducers and adjustment of the power supply voltage of the transducers, the precise adjustment of the atomization amount of the ultrasonic humidifier is achieved.

[0008] To achieve the above objectives, the present invention adopts the following technical solution, including:

[0009] A method for precisely adjusting the atomization volume of an ultrasonic humidifier, wherein the ultrasonic humidifier contains E transducers, and the method for adjusting the atomization volume of the ultrasonic humidifier is as follows:

[0010] S1, power is supplied to each of the E transducers in the ultrasonic humidifier one by one. The atomization amount of the ultrasonic humidifier increases with the increase of the number of transducers powered, until all E transducers are powered.

[0011] S2, after all E transducers in the ultrasonic humidifier are powered, the power supply voltage of the transducers is gradually increased. The atomization amount of the ultrasonic humidifier increases with the increase of the power supply voltage until the power supply voltage increases to the nominal value. At this time, the atomization amount of the ultrasonic humidifier reaches the nominal value.

[0012] Preferably, it is assumed that: the nominal atomization amount of the transducer is Qo; when the supply voltage of the transducer is u1, the atomization amount of the transducer is x*Qo, x∈(0,1); when the supply voltage of the transducer is u2, the atomization amount of the transducer is Qo; when the supply voltage of the transducer is in the range of u1-u2, the atomization amount of the transducer is linearly related to the supply voltage.

[0013] So:

[0014] In step S1, power is supplied to each of the E transducers in the ultrasonic humidifier one by one, and the power supply voltage of each transducer is u1. For each additional transducer supplied with power, the atomization amount of the ultrasonic humidifier increases by x*Qo, until all E transducers are supplied with power and the atomization amount of the ultrasonic humidifier reaches E*x*Qo.

[0015] In step S2, after all E transducers in the ultrasonic humidifier are powered, that is, after the atomization amount of the ultrasonic humidifier reaches E*x*Qo, the power supply voltage of the transducers is gradually increased. The atomization amount of the ultrasonic humidifier increases linearly with the increase of the power supply voltage until the power supply voltage increases to u2. At this time, the atomization amount of the ultrasonic humidifier reaches E*Qo.

[0016] The present invention also provides a device for precisely adjusting the atomization amount of an ultrasonic humidifier. Through the structure of a roller and a cylindrical cam, it integrates the functions of graded control of the number of transducers and adjustment of the power supply voltage of the transducers, and finally realizes the precise adjustment of the atomization amount of the ultrasonic humidifier.

[0017] To achieve the above objectives, the present invention adopts the following technical solution, including:

[0018] An apparatus for precisely adjusting the atomization amount of an ultrasonic humidifier, the apparatus comprising: a stepper motor, a first coupling, a roller, a power-taking pin array, a brush, a second coupling, a sliding potentiometer, a cylindrical cam, and an adjustable DC power supply;

[0019] The first coupling is used to connect the motor shaft of the stepper motor to the roller, which rotates under the drive of the stepper motor;

[0020] The power-collecting needle array is located below the drum. The power-collecting needle array includes n power-collecting needles evenly arranged, where n ≥ E. The placement direction of these n power-collecting needles is parallel to the axial direction of the drum, and the length of the power-collecting needle array is equal to the axial length of the drum. The top of the power-collecting needles is in contact with the outer wall surface of the drum.

[0021] Each of the power-collecting needles in the power-collecting needle array is connected to the power supply circuit of each transducer, and is used to supply power to each transducer respectively.

[0022] The outer wall of the drum includes a conductive area and an insulating area. When the rotation angle θ of the drum is 0°, the tops of all n charging needles are in contact with the insulating area on the outer wall of the drum. As the drum rotates, if the rotation angle θ increases from 0° but does not reach α°, the tops of all n charging needles will contact the conductive area on the outer wall of the drum one by one. This continues until the rotation angle θ increases to α°, at which point the tops of all n charging needles will contact the conductive area on the outer wall of the drum.

[0023] One end of the brush is connected to the output terminal of the adjustable DC power supply, and the other end of the brush is connected to the conductive area of ​​the roller, so that the adjustable DC power supply supplies power to the conductive area of ​​the roller through the brush.

[0024] The second coupling is used to connect the roller to the cylindrical cam, which rotates under the drive of the roller;

[0025] The cylindrical cam has a groove circumferentially formed on its side surface. The top of the slide rod of the sliding potentiometer is located in the groove. The slide rod moves as the cylindrical cam rotates, i.e., as the roller rotates. When the rotation angle θ of the roller is 0°, the slide rod is in its initial position. As the roller rotates, if the rotation angle θ increases from 0° but does not reach α°, the slide rod remains in its initial position and does not move. Only when the rotation angle θ increases to α° does the slide rod begin to move. The amount of displacement increases linearly with the increase of the rotation angle θ.

[0026] The sliding potentiometer generates a potential signal based on the position of the sliding rod. When the rotation angle θ of the roller is within the range of 0°-α°, the sliding rod does not move, and the potential signal does not change, remaining at the initial potential value. When the rotation angle θ of the roller is greater than α°, the sliding rod moves, and the displacement increases linearly with the increase of the rotation angle θ. The potential signal also increases linearly with the increase of the displacement. This continues until the rotation angle θ of the roller reaches its maximum, at which point the sliding rod reaches its maximum displacement, and the potential signal reaches its maximum potential value.

[0027] The adjustable DC power supply is used to receive the potential signal from the sliding potentiometer and adjust the output voltage according to the potential signal. This output voltage is the power supply voltage for the conductive area of ​​the roller.

[0028] Preferably, the device further includes: an encoder;

[0029] The encoder is used to input control signals and drive the stepper motor according to the control signals, thereby controlling the rotation of the stepper motor and thus controlling the rotation angle θ of the roller.

[0030] Preferably, the device further includes: an angle sensor;

[0031] The angle sensor is used to collect the actual rotation angle of the roller, generate a feedback signal based on the actual rotation angle of the roller, and send the feedback signal to the encoder;

[0032] After receiving the feedback signal, the encoder compares the control signal with the feedback signal. If the control signal and the feedback signal are inconsistent, the stepper motor is adjusted to make the control signal and the feedback signal consistent.

[0033] Preferably, the control signal input to the encoder is a 4-20mA current signal, and the 4-20mA current signal corresponds linearly to the rotation angle θ of 0-360°.

[0034] Preferably, the outer wall surface of the drum is a conductive area within a central angle range of α°-360°; within a central angle range of 0°-α°, the area of ​​the insulating area gradually decreases along the axial direction, while the area of ​​the conductive area gradually increases along the axial direction.

[0035] Preferably, the cylindrical cam has a groove circumferentially formed on its side surface. Within the range of 0°-α° central angle, the position of the groove on the side surface does not change; within the range of α°-360° central angle, the position of the groove on the side surface gradually shifts axially.

[0036] Preferably, if the number of transducers E in the ultrasonic humidifier is equal to the number of electrodes n in the electrode row, then the initial rotation angle of the drum and the cylindrical cam is 0°; if the number of transducers E in the ultrasonic humidifier is less than the number of electrodes n in the electrode row, then the initial rotation angle of the drum is 0°, and the initial rotation angle of the cylindrical cam is [(nE) / n]*α°.

[0037] Preferably, it is assumed that: the nominal atomization amount of the transducer is Qo; when the supply voltage of the transducer is u1, the atomization amount of the transducer is x*Qo, x∈(0,1); when the supply voltage of the transducer is u2, the atomization amount of the transducer is Qo; when the supply voltage of the transducer is in the range of u1-u2, the atomization amount of the transducer is linearly related to the supply voltage.

[0038] So:

[0039] When the potential signal of the sliding potentiometer is the initial potential value, the output voltage of the adjustable DC power supply is u1; when the potential signal of the sliding potentiometer is the maximum potential value, the output voltage of the adjustable DC power supply is u2.

[0040] The advantages of this invention are:

[0041] (1) The method of the present invention utilizes a coupling strategy of graded control of the number of transducers and adjustment of the power supply voltage of the transducers to achieve precise adjustment of the atomization amount of the ultrasonic humidifier.

[0042] (2) The device of the present invention converts the current control signal into the rotational motion of the stepper motor, and integrates the functions of graded control of the number of transducers and adjustment of the power supply voltage of the transducers through the roller and cylindrical cam structure, and finally realizes the precise adjustment of the atomization amount of the ultrasonic humidifier.

[0043] (3) The device of the present invention has strong compatibility. It can achieve precise control by accepting 4-20mA current signals, without the need for communication and repeated adjustment, and is convenient to power supply.

[0044] (4) The device of this invention is low in cost, easy to maintain, and has a simple structure. It is highly applicable, requires no complex algorithms, and can be used to retrofit existing ultrasonic humidifiers on the market, requiring only modifications to the transducer or mist generating chamber. It can quickly improve the adjustment performance of ultrasonic humidifiers and has high application value. Attached Figure Description

[0045] Figure 1 This is a flowchart of a method for precisely adjusting the atomization amount of an ultrasonic humidifier according to the present invention.

[0046] Figure 2 This is a structural diagram of a device for precisely adjusting the atomization amount of an ultrasonic humidifier according to the present invention.

[0047] Figure 3 This is a schematic diagram showing the connection between the device of the present invention and the ultrasonic humidifier.

[0048] Figure 4 This is a schematic diagram of the structure of the roller in the device of the present invention.

[0049] Figure 5 This is a schematic diagram of the cylindrical cam structure in the device of the present invention.

[0050] Figure 6 This is a schematic diagram of the operation of the device of the present invention.

[0051] Figure 7 This is a schematic diagram showing the relationship between the control signal input to the device of the present invention and the rotation angle.

[0052] Figure 8 This is a schematic diagram showing the relationship between the output voltage value and the rotation angle of the device of the present invention.

[0053] Figure 9 This diagram illustrates the relationship between the control signal input to the device of the present invention and the amount of atomization generated by the ultrasonic humidifier.

[0054] Figure 10 This is a schematic diagram showing the relationship between the atomization amount of a single transducer and the power supply voltage in this embodiment.

[0055] Explanation of reference numerals in the attached figures:

[0056] Encoder-1, Stepper Motor-2, First Coupling-3, Hall Angle Sensor-4, Roller-5, Power Pin Pack-6, Power Pin-61, Brush-7, Second Coupling-8, Sliding Potentiometer-9, Slide Rod-91, Cylindrical Cam-10, Groove-101, Bearing-11, Adjustable DC Power Supply-12, Terminal Block-13, Transducer Module-14. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] This invention designs a method for precisely adjusting the atomization amount of an ultrasonic humidifier. By utilizing a coupling strategy of graded control of the number of transducers and adjustment of the power supply voltage of the transducers, the precise adjustment of the atomization amount of the ultrasonic humidifier is achieved. A corresponding device is designed, which accepts a 4-20mA analog current signal for control, ultimately making the atomization amount of the ultrasonic humidifier linearly related to the signal intensity, with a control accuracy of up to 1.5% of the maximum atomization amount.

[0059] The amount of atomization produced by an ultrasonic humidifier depends on the mechanical work of the effective vibration generated by the transducer diaphragm. The transducer diaphragm is driven by a high-frequency oscillation circuit. Once the capacitors and inductors of the circuit hardware are fixed, the oscillation frequency of the circuit can be determined. In addition, the oscillation intensity of the circuit can be controlled by current or voltage. Generally speaking, the higher the voltage, the greater the oscillation current of the circuit, the greater the vibration amplitude of the diaphragm, and the greater the amount of atomization.

[0060] In this embodiment, the most common 36VdC powered, 1.7MHz transducer on the market is used as an example, with a nominal atomization amount of Qo, in g / h. For example... Figure 10 As shown, the amount of atomization produced by a single transducer is not linearly related to the power supply voltage of the single transducer's power supply circuit.

[0061] like Figure 10 As shown, when the supply voltage is less than a certain value, the mechanical work of the diaphragm vibration cannot break the surface tension of the water surface, and atomization cannot be formed. When the supply voltage reaches a critical value, the continuity of the liquid surface is disrupted, and the atomization amount increases rapidly. In this embodiment, when the supply voltage of the transducer is around 22V, the atomization amount begins to increase steadily as the supply voltage increases.

[0062] like Figure 10 As shown, when the power supply voltage of the transducer is in the range of u1-u2, the atomization amount of the transducer is linearly related to the power supply voltage. In this embodiment, the power supply voltage of the transducer is in the range of 24V-34V, that is, u1=24V, u2=34V, and the atomization amount of the transducer shows a relatively obvious linear relationship with the power supply voltage.

[0063] like Figure 10 As shown, when the transducer is driven by a 34V supply voltage, the atomization amount reaches the nominal atomization amount Qo. Although 36V is the nominal value, the atomization amount corresponding to 34V actually reaches the nominal value Qo. When the transducer is driven by a 24V supply voltage, the ratio of the transducer's atomization amount to the nominal atomization amount Qo is x, that is, the transducer's atomization amount is x*Qo.

[0064] Under fixed water depth and water temperature (which determines the viscosity of the water), excluding factors such as circuit aging, the values ​​of u1, u2 and x are constant for transducers of the same model. Generally, x∈(0.25,0.35).

[0065] In this embodiment, the industrial ultrasonic humidifier contains E transducers. If only the power supply voltage is continuously adjustable, the minimum atomization amount of the ultrasonic humidifier is E*x*Qo. It is evident that adjusting the atomization amount solely by the power supply voltage is not precise enough; the portion of the atomization amount below E*x*Qo requires further fine-tuning. Therefore, this invention controls the number of transducers in operation and individually controls the power supply circuit of each transducer, achieving a fine-tuned, segmented control. This allows for precise adjustment of the atomization amount below E*x*Qo. If each transducer is powered independently, at a 24V power supply voltage, the minimum control level difference is the atomization amount of a single transducer, which is x*Qo. The corresponding control precision is x*Qo / E*Qo, or x / E. To achieve a control precision within 1.5%, considering the range of x, an E value above 24 is sufficient.

[0066] like Figure 1 As shown, the present invention provides a method for precisely adjusting the atomization amount of an ultrasonic humidifier, as detailed below:

[0067] S1, power is supplied to each of the E transducers in the ultrasonic humidifier one by one, and the power supply voltage of each transducer is u1. In this embodiment, u1 = 24V. The atomization amount of the ultrasonic humidifier increases with the increase of the number of transducers powered, and increases continuously in small increments. For each additional transducer powered, the atomization amount of the ultrasonic humidifier increases by x*Qo; until all E transducers are powered, the atomization amount of the ultrasonic humidifier reaches E*x*Qo.

[0068] S2, after all E transducers in the ultrasonic humidifier are powered, the power supply voltage of the transducers is gradually increased. The atomization amount of the ultrasonic humidifier increases linearly with the increase of the power supply voltage. Until the power supply voltage increases to u2, in this embodiment, u2 = 34V, at which point the atomization amount of the ultrasonic humidifier reaches E*Qo.

[0069] like Figure 2 , Figure 3 As shown, the present invention provides a device for precisely adjusting the atomization amount of an ultrasonic humidifier. It utilizes a stepper motor, a power-taking pin array, a cylindrical cam, an adjustable DC power supply, etc., to ultimately achieve a coupled control strategy of graded control of the number of transducers and adjustment of the power supply voltage of the transducers.

[0070] like Figure 2 , Figure 3 As shown, a device for precisely adjusting the atomization amount of an ultrasonic humidifier specifically includes: an encoder 1, a stepper motor 2, a first coupling 3, an angle sensor 4, a roller 5, a power pin array 6, a brush 7, a second coupling 8, a sliding potentiometer 9, a cylindrical cam 10, a bearing 11, an adjustable DC power supply 12, a terminal block 13, and a transducer module 14.

[0071] The first coupling 3 is used to connect the motor shaft of the stepper motor 2 to the roller 5; the roller 5 rotates under the drive of the motor shaft and the first coupling 3.

[0072] The encoder 1 is used to receive control signals, which are 4-20mA current signals. Based on the control signals, the encoder drives the stepper motor 2, controlling the rotation of the stepper motor 2, thereby controlling the rotation angle θ of the roller 5.

[0073] The encoder 1 is also used to receive the feedback signal from the angle sensor 4, compare the control signal with the feedback signal from the angle sensor 4, and if the control signal is greater than the feedback signal, the encoder 1 outputs a clockwise driving signal and sends it to the stepper motor 2; otherwise, the encoder 1 outputs a counterclockwise driving signal and sends it to the stepper motor 2.

[0074] The stepper motor 2 is used to receive the drive signal sent by the encoder 1 and to operate according to the drive signal.

[0075] The angle sensor 4 is used to acquire the actual rotation angle of the roller 5, generate a feedback signal based on the actual rotation angle of the roller 5, linearly convert the 0-360° rotation angle into a 4-20mA current signal as the feedback signal, and send the feedback signal to the encoder 1. In this embodiment, the angle sensor 4 is a Hall angle sensor.

[0076] The power-collecting needle array 6 is located below the drum 5. The power-collecting needle array 6 comprises n power-collecting needles 61 evenly spaced, where n ≥ E. The placement direction of these n power-collecting needles 61 is parallel to the axial direction of the drum 5, and the length of the power-collecting needle array 6 is equal to the axial length of the drum 5. The needle body of the power-collecting needle 61 is made of copper. The top of the power-collecting needle 61 contacts the outer wall surface of the drum 5, and the bottom of the power-collecting needle 61 is supported by a spring to ensure reliable contact between the needle top and the drum 5.

[0077] Each power-collecting needle 61 in the power-collecting needle row 6 is connected to the power supply circuit of each transducer, and is used to supply power to each transducer respectively. In this embodiment, the power-collecting needle row 6 includes 30 power-collecting needles 61, i.e., n=30. These 30 power-collecting needles are numbered from right to left as 1#, 2#, 3#...30#.

[0078] The cylinder of the roller 5 is mainly made of copper, and a portion of the outer wall of the roller 5 is covered with insulating material, thus dividing the outer wall into conductive and insulating areas. Specifically, as follows... Figure 4As shown, the outer wall surface of the drum 5 is a conductive area within the range of α°-360° of the central angle θ1; within the range of 0°-α° of the central angle θ1 of the outer wall surface of the drum 5, the area of ​​the insulating area gradually decreases along the axial direction, while the area of ​​the conductive area gradually increases along the axial direction. In this embodiment, α°=144°.

[0079] When the rotation angle θ of the drum 5 is 0°, the tops of all 30 power-collecting needles 61 are in contact with the insulating area on the outer wall of the drum. As the drum 5 rotates, when the rotation angle θ increases from 0° but does not reach α°, the tops of the 30 power-collecting needles 61 contact the conductive area on the outer wall of the drum one by one, until the rotation angle θ increases to α°, at which point the tops of all 30 power-collecting needles 61 are in contact with the conductive area on the outer wall of the drum.

[0080] One end of the brush 7 is connected to the positive output terminal of the adjustable DC power supply 12, and the other end of the brush 7 is connected to the conductive area of ​​the roller 5, so that the adjustable DC power supply 12 supplies power to the conductive area of ​​the roller 5 through the brush 7.

[0081] The second coupling 8 is used to connect the roller 5 and the cylindrical cam 10. The cylindrical cam 10 rotates under the drive of the roller 5. The cylindrical cam 10 and the roller 5 rotate synchronously, that is, the rotation angle θ is the same.

[0082] The cylindrical cam 10 has a groove 101 circumferentially formed on its side surface. The groove shape of the groove 101 is as follows: Figure 5 As shown, within the range of central angle θ2 from 0° to α°, the position of groove 101 on the side remains unchanged; within the range of central angle θ2 from α° to 360°, the position of groove 101 on the side gradually shifts along the axial direction of the column wheel. In this embodiment, α° = 144°.

[0083] The top end of the slide rod 91 of the sliding potentiometer 9 is located in the groove 101. The slide rod 91 is displaced horizontally, i.e., in a direction parallel to the axis of the roller, as the cylindrical cam 10 rotates, i.e., as the roller 5 rotates. In this embodiment, the top end of the slide rod 91 is provided with a ball bearing. The ball bearing is placed in the groove of the cylindrical cam 10. Under the action of the bottom spring tension, the slide rod is displaced horizontally along the groove shape.

[0084] When the rotation angle θ of the roller 5 is 0°, the slide bar 91 is in the initial position. As the roller 5 rotates, the rotation angle θ increases from 0° and does not reach α°. The slide bar 91 remains in the initial position and does not produce displacement until the rotation angle θ increases to α°. The slide bar 91 then begins to produce displacement, and the amount of displacement increases with the increase of the rotation angle θ, showing a linear relationship.

[0085] The sliding potentiometer 9 generates a potential signal based on the position of the slide rod 91. When the rotation angle θ of the roller 5 is within the range of 0°-α°, the slide rod 91 does not move, and the potential signal remains unchanged, remaining at the initial potential value. When the rotation angle θ of the roller 5 is greater than α°, the slide rod 91 moves, and the potential signal increases linearly with the increase in displacement. This continues until the rotation angle θ of the roller 5 reaches its maximum angle of 360°, at which point the slide rod 91 reaches its maximum displacement, and the potential signal increases to its maximum potential value. In this embodiment, an adjusting nut is provided at the bottom of the slide rod 91 to adjust its initial position, thereby adjusting the initial potential value of the potential signal.

[0086] The adjustable DC power supply 12 receives the potential signal from the sliding potentiometer 9 and adjusts the output voltage according to the potential signal. The output voltage is a DC voltage of 24-34V, which is the power supply voltage for the conductive area of ​​the roller 5. Specifically, when the potential signal of the sliding potentiometer 9 is the initial potential value, the output voltage of the adjustable DC power supply 12 is u1, i.e., 24V; when the potential signal of the sliding potentiometer 9 is the maximum potential value, the output voltage of the adjustable DC power supply 12 is u2, i.e., 34V.

[0087] The terminal block 13 includes all the power supply terminals and signal terminals involved in the device.

[0088] The transducer module 14 consists of E transducers from the ultrasonic humidifier, numbered sequentially as 1#, 2#, 3#...E#, where E≤n, i.e., E≤30. Each transducer is powered by 36VdC at a power frequency of 1.7MHz. The positive and negative terminals of each transducer must be individually led out. The negative terminal of each transducer is connected to the negative output terminal of the adjustable DC power supply 12, and the positive terminal of each transducer is connected to the respective power-taking pin 61 via the terminal block 13.

[0089] If the number of transducers E in the ultrasonic humidifier is equal to the number of electrodes 61 in the electrode pin array 6 (i.e., 30 transducers are connected to the terminal block 13), then the initial rotation angle of both the roller 5 and the cylindrical cam 10 is 0°. If the number of transducers E in the ultrasonic humidifier is less than the number of electrodes 61 in the electrode pin array 6, then the initial rotation angle of the roller 5 is 0°, and the initial rotation angle of the cylindrical cam 10 is [(nE) / n]*α°, still achieving a control accuracy of x / E. The initial rotation angle of the cylindrical cam 10 can be adjusted to [(nE) / n]*α° by adjusting the second coupling 8.

[0090] like Figure 6 As shown, the specific working process of a device for precisely adjusting the atomization amount of an ultrasonic humidifier is as follows:

[0091] The adjustable DC power supply 12 accepts an external 220VAC power supply; the encoder 1 accepts an external 124VdC power supply and a 4-20mA current signal as a control signal. In this embodiment, it is assumed that the number of transducers in the transducer module 14 is 30, and the initial rotation angle of the roller 5 and the cylindrical cam 10 is 0°.

[0092] Encoder 1 compares the control signal with the feedback signal from angle sensor 4, controlling stepper motor 2 to rotate forward until the feedback signal and control signal are consistent. The linear correspondence between the 4-20mA current signal and the 0-360° rotation angle is as follows: Figure 7 As shown.

[0093] Under the drive of the second coupling 8, the cylindrical cam 10 rotates synchronously with the roller 5, and drives the slide rod 91 of the sliding potentiometer 9 to move through the groove shape of the groove 101, generating a potential signal, and finally controlling the output voltage value of the adjustable DC power supply 12 through the potential signal.

[0094] Groove 101 is shaped like Figure 5 As shown, when the rotation angle θ ≤ 144°, the groove 101 does not cause the slider 91 of the sliding potentiometer 9 to move. Therefore, when the rotation angle θ ≤ 144°, the potential signal of the sliding potentiometer 9 is the initial potential value, and the output voltage value of the adjustable DC power supply 12 is a fixed value. This fixed value is adjusted to 24V by adjusting the bottom nut of the sliding potentiometer 9. When the rotation angle θ ≥ 144°, as the rotation angle θ increases, the groove 101 causes the slider 91 of the sliding potentiometer 9 to move, and the potential signal of the sliding potentiometer 9 increases linearly, eventually achieving a linear increase in the output voltage value of the adjustable DC power supply 12 to 34V with the increase of the rotation angle θ. The linear correspondence between the output voltage value of the adjustable DC power supply 12 and the rotation angle θ is as follows: Figure 8 As shown.

[0095] The conductive and insulating areas of roller 5 are as follows Figure 4 As shown, the conductive area draws power from the positive output terminal of the adjustable DC power supply 12 via brush 7. Driven by stepper motor 2, it rotates. As the rotation angle θ increases, the power-collecting needles 61 in the power-collecting needle row 6 (1#, 2#, 3#, etc.) successively contact the conductive area of ​​the roller 5. At the same time, the power supply circuits of transducers 1#, 2#, 3#, etc. in the transducer module 14 are successively turned on and begin to work. Until the rotation angle θ reaches 144° (corresponding to a control current of 10.4mA), all 30 transducers in the transducer module 14 begin to work.

[0096] When the transducer is driven by a 24V power supply voltage, the ratio of the transducer atomization amount to the nominal atomization amount Qo is x. When the transducer is driven by a 34V power supply voltage, the transducer atomization amount reaches the nominal atomization amount Qo.

[0097] Therefore, when the rotation angle θ < 144°, the control increment of the atomization amount produced by the ultrasonic humidifier is x*Qo; when the rotation angle θ is 144°, the atomization amount produced by the ultrasonic humidifier is 30*x*Qo; and when θ > 144°, as... Figure 9 As shown, the number of transducers in operation no longer increases. The output voltage of the adjustable DC power supply 12 increases linearly with the increase of the rotation angle θ. The amount of atomization produced by the transducer increases linearly and continuously with the increase of voltage. Considering that the amount of atomization increases linearly and continuously, it belongs to stepless adjustment and there is no control step difference. Therefore, the control accuracy depends on the control accuracy in the range of θ≤144°. The control accuracy Ψ=(x*Qo) / (30*Qo)=x / 30. Since x∈(0.25,0.35), the designed control accuracy is between 0.83-1.17%, and the linear relationship between the amount of atomization and the control signal is finally achieved well.

[0098] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for precisely adjusting the atomization amount of an ultrasonic humidifier, characterized in that, The ultrasonic humidifier has a total of E transducers, and the device includes: a roller (5), a power-taking pin array (6), a brush (7), a second coupling (8), a sliding potentiometer (9), a cylindrical cam (10), and an adjustable DC power supply (12). The power-collecting needle array (6) is located below the drum (5). The power-collecting needle array (6) includes n power-collecting needles (61) evenly arranged, where n ≥ E. The placement direction of these n power-collecting needles (61) is parallel to the axial direction of the drum (5). The top of the power-collecting needles (61) is in contact with the outer wall surface of the drum (5). Each of the power-collecting needles (61) in the power-collecting needle array (6) is connected to the power supply circuit of each transducer, and is used to supply power to each transducer respectively; The outer wall of the drum (5) includes a conductive area and an insulating area. When the rotation angle θ of the drum (5) is 0°, the tops of the n charging needles (61) are in contact with the insulating area in the outer wall of the drum. As the drum (5) rotates, when the rotation angle θ increases from 0° and does not reach α°, the tops of the n charging needles (61) contact the conductive area in the outer wall of the drum one by one. Until the rotation angle θ increases to α°, the tops of the n charging needles (61) are in contact with the conductive area in the outer wall of the drum. One end of the brush (7) is connected to the output end of the adjustable DC power supply (12), and the other end of the brush (7) is connected to the conductive area of ​​the roller (5), so that the adjustable DC power supply (12) supplies power to the conductive area of ​​the roller (5) through the brush (7); The second coupling (8) is used to connect the roller (5) to the cylindrical cam (10), which rotates under the drive of the roller (5); The cylindrical cam (10) has a groove (101) circumferentially formed on its side surface. The top of the slide rod (91) of the sliding potentiometer (9) is located in the groove (101). The slide rod (91) moves with the rotation of the cylindrical cam (10), which is the same as the rotation of the roller (5). When the rotation angle θ of the roller (5) is 0°, the slide rod (91) is in the initial position. As the roller (5) rotates, the rotation angle θ increases from 0° and does not reach α°. The slide rod (91) remains in the initial position and does not move. The slide rod (91) begins to move after the rotation angle θ increases to α°. The amount of displacement increases with the increase of the rotation angle θ and is linear. The sliding potentiometer (9) generates a potential signal based on the position of the sliding rod (91). When the rotation angle θ of the roller (5) is within the range of 0°-α°, the sliding rod (91) does not move, and the potential signal does not change; both are the initial potential values. When the rotation angle θ of the roller (5) is greater than α°, the sliding rod (91) moves, and the displacement increases linearly with the increase of the rotation angle θ. The potential signal also increases linearly with the increase of the displacement. The sliding rod (91) reaches its maximum displacement and the potential signal reaches its maximum potential value when the rotation angle θ of the roller (5) reaches its maximum angle. The adjustable DC power supply (12) is used to receive the potential signal of the sliding potentiometer (9) and adjust the output voltage according to the potential signal. The output voltage is the power supply voltage of the conductive area of ​​the roller (5). When the potential signal is the initial potential value, the output voltage is the initial voltage. When the potential signal increases, the output voltage increases. When the potential signal reaches the maximum potential value, the output voltage reaches the maximum voltage.

2. The device for precisely adjusting the atomization amount of an ultrasonic humidifier according to claim 1, characterized in that, The device also includes: an encoder (1), a stepper motor (2), and a first coupling (3); The first coupling (3) is used to connect the motor shaft of the stepper motor (2) to the roller (5), which rotates under the drive of the stepper motor (2); The encoder (1) is used to input control signals and drive the stepper motor (2) according to the control signals, thereby controlling the rotation of the stepper motor (2) and thus controlling the rotation angle θ of the roller (5).

3. The device for precisely adjusting the atomization amount of an ultrasonic humidifier according to claim 2, characterized in that, The device also includes: an angle sensor (4); The angle sensor (4) is used to collect the actual rotation angle of the roller (5), generate a feedback signal based on the actual rotation angle of the roller (5), and send the feedback signal to the encoder (1). After receiving the feedback signal, the encoder (1) compares the control signal with the feedback signal. If the control signal and the feedback signal are inconsistent, the stepper motor (2) is adjusted to make the control signal and the feedback signal consistent.

4. A device for precisely adjusting the atomization amount of an ultrasonic humidifier according to claim 2 or 3, characterized in that, The control signal input to the encoder (1) is a 4-20mA current signal, which is linearly related to the rotation angle θ of 0-360°.

5. The device for precisely adjusting the atomization amount of an ultrasonic humidifier according to claim 1, characterized in that, The outer wall of the drum (5) is a conductive area within the range of central angle α°-360°; within the range of central angle 0°-α°, the area of ​​the insulating area gradually decreases along the axial direction, while the area of ​​the conductive area gradually increases along the axial direction.

6. The device for precisely adjusting the atomization amount of an ultrasonic humidifier according to claim 1, characterized in that, The cylindrical cam (10) has a groove (101) circumferentially formed on its side surface. Within the range of 0°-α° central angle, the position of the groove (101) on the side surface does not change. Within the range of α°-360° central angle, the position of the groove (101) on the side surface gradually shifts axially.

7. The device for precisely adjusting the atomization amount of an ultrasonic humidifier according to claim 1, characterized in that, If the number of transducers E in the ultrasonic humidifier is equal to the number of electrodes (61) n in the electrode row (6), then the initial rotation angle of the roller (5) and the cylindrical cam (10) is 0°; if the number of transducers E in the ultrasonic humidifier is less than the number of electrodes (61) n in the electrode row (6), then the initial rotation angle of the roller (5) is 0°, and the initial rotation angle of the cylindrical cam (10) is [(nE) / n]. α°.

8. The device for precisely adjusting the atomization amount of an ultrasonic humidifier according to claim 1, characterized in that, Assumptions: The nominal atomization quantity of the transducer is Qo; when the supply voltage of the transducer is u1, the corresponding atomization quantity of the transducer is x. Qo, x∈(0,1); when the supply voltage of the transducer is u2, the atomization amount of the transducer is Qo; when the supply voltage of the transducer is in the range of u1-u2, the atomization amount of the transducer is linearly related to the supply voltage. So: When the potential signal of the sliding potentiometer (9) is the initial potential value, the output voltage of the adjustable DC power supply (12) is u1; when the potential signal of the sliding potentiometer (9) is the maximum potential value, the output voltage of the adjustable DC power supply (12) is u2.

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