Dual generator parallel ultrasonic cleaning machine

Abstract

The utility model provides a kind of double generator parallel ultrasonic cleaning machine, in the bottom surface outer wall of stainless steel cleaning tank 7, two industrial-grade ultrasonic generators 10 are symmetrically deviated from center and installed in parallel, are synchronously driven by single driving plate 13 "one drags two", single transducer power is less than or equal to 75% rated value, make the average of five-point field strength in tank reach higher value, uniformity is improved by 24% compared with single generator.The tank bottom is sequentially arranged with ceramic heat insulation cotton 21, heater box 20 and ceramic heater 22 capacitor inductive control panel 27 is sealed by PETG box cover 28, with gas removal, memory and overheat protection function;Fan 23 forced air cooling.4mm engineering plastic double stopper shell of complete machine, meet medical, commercial high frequency, high reliability cleaning demand.

Description

Technical Field

[0001] This utility model relates to cleaning devices, and more particularly to a dual-generator parallel ultrasonic cleaner. Background Technology

[0002] In precision industries such as medical dentistry, nail art, and jewelry, the cleanliness requirements for small instruments are becoming increasingly stringent. Currently available commercially available household ultrasonic cleaners with a capacity of ≤2 L generally adopt a "single drive board + single transducer" structure: the transducer is centrally bonded to the bottom of the stainless steel tank, and the drive board continuously outputs power at 90%–95% of its rated power. This design has the following drawbacks: 1. Uneven sound field: A single transducer forms a high-intensity standing wave at the center of the tank bottom, while the sound energy attenuates by 30% to 50% in the four corner areas. For slender workpieces such as dental handpieces and nail files whose length is close to the diagonal of the tank, there is an over-cleaning phenomenon in the middle and under-cleaning at both ends, which seriously affects the consistency of cleaning and the reliability of disinfection.

[0003] 2. Power and temperature rise contradiction: In order to compensate for insufficient edge energy, users often extend the working time or increase the driving power, resulting in a transducer temperature rise of >20 K, accelerated aging of piezoelectric ceramics, and shortened life of the whole machine; at the same time, high heat is conducted to the electronic cavity, increasing the failure rate of the drive board.

[0004] 3. Structural limitations make upgrades difficult: Due to the small volume of less than 2 L, it is impossible to improve uniformity by simply increasing the size of the transducer or the number of oscillators; if the driving voltage is forcibly increased, EMI exceeding the standard and cavitation corrosion of the tank will become prominent problems.

[0005] 4. Limited functionality and poor reliability: Traditional models lack independent heat dissipation channels, and the internal temperature can reach over 65°C after 15 minutes of continuous operation; the control board mostly consists of mechanical buttons, which are easily corroded by disinfectant and become ineffective; it also lacks an interface for linkage with external circulation filtration devices, making it difficult to meet the high-frequency use requirements of medical or commercial applications.

[0006] Therefore, developing a small ultrasonic cleaner that can significantly improve sound field uniformity, reduce individual unit load, and possess medical-grade reliability without increasing the overall size of the machine has become a pressing technical challenge for the industry. Summary of the Invention

[0007] To address the above deficiencies, this utility model proposes a dual-generator parallel ultrasonic cleaning machine, characterized by comprising: a housing assembly; a stainless steel cleaning tank 7 disposed within the housing assembly; two ultrasonic generators 10 fixed to the bottom outer surface of the stainless steel cleaning tank 7 and symmetrically offset from the geometric center of the tank bottom and arranged in parallel; an ultrasonic drive circuit electrically connected to the two ultrasonic generators 10 for simultaneously driving the two ultrasonic generators 10 in parallel with a single drive board; the parameters of the two ultrasonic generators are identical.

[0008] The dual-generator parallel ultrasonic cleaning machine is characterized in that the ultrasonic drive circuit includes: a main PCB board 13, which is provided with a drive circuit composed of transistors Q3 and Q4, resonant inductors L3 and L4, and resonant capacitor C36. The drive circuit is connected in parallel with the first transducer HTD and the second transducer HTD1 to synchronously distribute a single drive signal to the two ultrasonic generators 10.

[0009] The dual-generator parallel ultrasonic cleaning machine is characterized in that the tolerance of the resonant capacitor C36 is ≤5%.

[0010] The dual-generator parallel ultrasonic cleaning machine is characterized in that the resonant frequency of the resonant network formed by the resonant inductors L3 and L4 and the resonant capacitor C36 is 32kHz±5kHz, and the main PCB board 13 limits the output power of each ultrasonic generator 10 to 55~80% of its rated power to reduce the individual load and extend the service life.

[0011] The dual-generator parallel ultrasonic cleaning machine is characterized in that the output power of each ultrasonic generator 10 is limited to 65-75% of its rated power.

[0012] The dual-generator parallel ultrasonic cleaning machine is characterized by further comprising: a ceramic heater 22 disposed below the stainless steel cleaning tank 7 and insulated from its bottom; a heater box 20 and a heater cover 19 encapsulating the ceramic heater 22; and ceramic heat insulation cotton 21 sandwiched between the heater box 20 and the stainless steel cleaning tank 7.

[0013] The dual-generator parallel ultrasonic cleaning machine is characterized in that the two ultrasonic generators 10 are symmetrically offset from the center by 7mm, and the center distance is 106.6mm.

[0014] The dual-generator parallel ultrasonic cleaning machine is characterized by further comprising: a capacitive sensing control board 27, which is sealed and installed on the upper cover 4 by a PETG material control box cover 28; and a forced air-cooled fan 23, which is fixed to the fan cover 24 and faces the main PCB board 13, the capacitive sensing control board 27, and the ultrasonic generator 10 to reduce the continuous operating temperature rise.

[0015] The technical effects of the technical solution of this utility model are as follows: 1. By arranging two ultrasonic generators 7mm off-center with a center distance of 106.6mm, and verifying the results through five-point field strength testing, the average field strength of the whole machine is increased by about 24% compared with the single generator solution, and the cleaning uniformity is significantly improved.

[0016] 2. The "one-to-two" parallel drive circuit is adopted, with a single drive board driving two transducers simultaneously. The output power of the transducers is controlled within 75% of the rated power, reducing the load on each unit and extending its lifespan.

[0017] 3. The capacitive sensing control board is used in conjunction with the PETG material control box cover, which has the characteristics of chemical corrosion resistance and high waterproof rating, meeting the requirements of medical disinfection environment.

[0018] 4. The built-in ceramic heat insulation cotton and forced air cooling dual heat dissipation structure enable the whole machine to work continuously without overheating, improving reliability by more than 30%.

[0019] 5. An independent DC12V socket allows for the connection of an external water circulation filter, enabling the cleaning solution to circulate and purify, thus expanding application scenarios. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a dual-generator parallel ultrasonic cleaner; Figure 2 This is an exploded view of a dual-generator parallel ultrasonic cleaner; Figure 3 This is a schematic diagram of a single generator layout; Figure 4 This is a schematic diagram of a dual-generator layout; Figure 5 This is a five-point field strength distribution diagram of a single-generator ultrasonic cleaner. Figure 6 This is a five-point field strength distribution diagram of a dual-generator ultrasonic cleaner; Figure 7 This is a schematic diagram of the drive circuit for an ultrasonic cleaner. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Figure 1 This is a schematic diagram of a dual-generator parallel ultrasonic cleaner; Figure 2 This is an exploded view of a dual-generator parallel ultrasonic cleaner; the entire machine, from bottom to top, consists of: a base shell 14, a main PCB board 13, ceramic insulation cotton 21, a heater box 20, a ceramic heater 22, a heater cover 19, a stainless steel cleaning tank 7, an inner cylinder 12, a silicone rubber sealing ring 6, a pressure ring 5, an upper cover 4, a transparent lens on the upper cover 2, an upper cover handle 3, a handle pressure block 1, a decorative panel 26, a left handle 25, and a right handle 8; a capacitive sensing control board 27 is installed inside the control box cover 28 and has a control panel label attached. The adhesive strip 29 is fixed to one side of the top cover 4; the fan 23 is fixed to the side wall of the bottom shell 14 through the fan cover 24, and provides forced heat dissipation for the main PCB board 13, the capacitive sensing control board 27, and the ultrasonic generator 10; the AC socket 16, DC socket 18, and rocker switch 17 are arranged sequentially on the rear wall of the bottom shell 14, and are electrically connected to the main PCB board 13 through the socket PCB board 15; the insulating sheet 9 is sandwiched between the rocker switch 17 and the AC socket 16 to meet the creepage distance requirements of safety regulations.

[0023] Ordinary household ultrasonic cleaners with a capacity of 2L or less use a single drive board and a single transducer. The ultrasonic effect is strongest at the center of the transducer, while the ultrasonic waves attenuate significantly at the sides far from the transducer. This can lead to uneven distribution of ultrasonic intensity when cleaning high-quality items or long, narrow objects. Figure 3 This is a schematic diagram of a single generator layout; the ultrasonic generator is glued to the outer surface of the center bottom of the stainless steel cleaning tank. Figure 5 This is a five-point field strength distribution diagram of a single-generator ultrasonic cleaner. After testing the field strength at five points, it is found to be very uneven. For example, the center reaches 99W / cm², while the four corners are 55W / cm², 59W / cm², 69W / cm², and 72W / cm², respectively. The average field strength at the five points is 70.8W / cm².

[0024] To solve this problem, a 1-to-2 method is adopted, that is, one drive board drives two transducers HTD and HTD1, which can achieve uniform ultrasonic wave distribution throughout the cleaning tank.

[0025] Figure 4This is a schematic diagram of the dual-generator layout; the two ultrasonic generators 10 are glued to the outer surface of the bottom of the stainless steel cleaning tank 7, with the center line parallel to the long side of the cleaning tank, the center distance L=106.6 mm, and the center line offset 7 mm from the geometric center of the bottom of the tank towards the short side.

[0026] Figure 6 This is a five-point field strength distribution diagram of a dual-generator ultrasonic cleaner. After testing and sampling, the center reaches 106 W / cm², while the four corners are 87 W / cm², 84 W / cm², 82 W / cm², and 80 W / cm² respectively. The average field strength at the five points is 87.8 W / cm². The average difference is 24% for the same output power.

[0027] Figure 7 This is the schematic diagram of the drive circuit for an ultrasonic cleaner. In the practical application of a 1-to-2 configuration, the most challenging aspect of the drive circuit is maintaining the consistency of the output from the two transducers, HTD and HTD1, and ensuring the stability of the circuit operation. This is achieved by first determining the transducer parameters and then adjusting the drive board to match appropriate parameters. For transducers HTD and HTD1 to operate stably for extended periods, good parameter consistency is crucial on the same machine. Capacitor value error should not exceed 5%, and the transducer output power should not exceed 75% of its rated power, or 95% when using a single transducer circuit. By adjusting L3, L4, and C36 on the drive board, a stable output frequency and power for transducers HTD and HTD1 are achieved. The main PCB board 13 uses single drive chips Q3 and Q4, matched to the two parallel transducers HTD and HTD1 via a resonant network of L3, L4, and C36. The resonant frequency is 32kHz±5kHz, and the output power is stable at 42W*2±10W.

[0028] The main components of the drive circuit include the power supply section, the control section, the ultrasonic generator drive section, the heating control section, and the cooling fan control section.

[0029] 1. Power Supply Section: The circuit is powered by an AC 220V-240V power supply, which is stepped down to a suitable voltage for circuit operation by transformer T1. The rectifier bridge converts the AC power to DC power, and after filtering and voltage regulation, it provides a stable DC power supply for the circuit.

[0030] 2. Control Section: The circuit includes a control board, which controls the operation of the cleaning machine via a capacitive sensing control board 27. The control board is sealed to the upper cover 4 by a PETG material control box cover 28 to improve waterproof performance and chemical corrosion resistance.

[0031] 3. Ultrasonic Generator Drive Section: The circuit includes two ultrasonic generators 10, controlled by a drive circuit on the main PCB board 13. The drive circuit consists of transistors Q3 and Q4, resonant inductors L3 and L4, and resonant capacitor C36, achieving a "one-to-two" drive mode, that is, one drive board simultaneously drives two transducers HTD and HTD1, ensuring uniform distribution of ultrasonic waves in the cleaning tank.

[0032] 4. Heating Control Section: The circuit includes a ceramic heater 22, encapsulated by a heater housing 20 and a heater cover 19, and insulated by ceramic insulation cotton 21. Heating control is achieved through a control board; the heater stops heating when the water temperature reaches 55℃.

[0033] 5. Cooling fan control section: The circuit includes a cooling fan 23, which is fixed by a fan cover 24 to provide forced air cooling for the main PCB board 13, the capacitive sensing control board 27 and the ultrasonic generator 10, so as to reduce the temperature rise during continuous operation.

[0034] Examples of the functions of each indicator light can be flexibly adjusted according to actual operational needs: 1. Power On and Overheat Alarm Indicator Lights: When the washer is powered on, the green light will illuminate, indicating normal power supply. If the red light is on, it indicates that the internal temperature is too high, and the water needs to be changed. Normal operation can only resume after the internal temperature has decreased and the red light turns green.

[0035] 2. Degassing button: Press the degassing button to start the degassing process. To extend the degassing time, press the button again after the degassing process is complete.

[0036] 3. Time Down arrow key: When the time is 00:50, each press of the ▽ key lowers the time by 10 seconds. When the time is in minutes, such as 03:00, each press of the ▽ key lowers the time by 1 minute.

[0037] 4. Power On / Off Key: Upon first power-on and pressing the power button, the program will automatically enter a 01:30 degassing phase, and then enter the set cleaning time. It has a memory function; 5 seconds after cleaning completes at 00:00, it returns to the last set cleaning time. It has a continuous operation protection function: if the machine operates continuously for a cumulative total of 45 minutes (with intervals of less than 5 minutes), it will be forcibly stopped for 10 minutes (during which time the cooling fan will continuously dissipate heat for 10 minutes). During this time, the digital display will show no display and instead show a loop waiting symbol.

[0038] 5. Heating button: When the water temperature reaches 55℃, the heater stops heating and the symbol goes out.

[0039] The above-disclosed embodiments are merely one example of the present utility model and should not be construed as limiting the scope of the present invention. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes in accordance with the claims of the present utility model still fall within the scope of the present utility model.

Claims

1. A double generator parallel ultrasonic cleaning machine, characterized by, include: The housing assembly; a stainless steel cleaning tank (7) disposed within the housing assembly; two ultrasonic generators (10) fixed to the bottom outer surface of the stainless steel cleaning tank (7) and symmetrically offset from the geometric center of the bottom of the tank and arranged in parallel; an ultrasonic drive circuit electrically connected to the two ultrasonic generators (10) for simultaneously driving the two ultrasonic generators (10) in parallel with a single drive board; the parameters of the two ultrasonic generators are the same.

2. The dual generator parallel ultrasonic cleaning machine according to claim 1, wherein, The ultrasonic driving circuit includes a main PCB board (13), which is provided with a driving circuit consisting of transistors Q3 and Q4, resonant inductors L3 and L4, and resonant capacitor C36. The driving circuit is connected in parallel with the first transducer HTD and the second transducer HTD1 to synchronously distribute a single driving signal to the two ultrasonic generators (10).

3. The dual generator parallel ultrasonic cleaning machine according to claim 2, wherein, The tolerance of the resonant capacitor C36 is ≤5%.

4. The dual generator parallel ultrasonic cleaning machine according to claim 3, wherein, The resonant frequency of the resonant network formed by the resonant inductors L3 and L4 and the resonant capacitor C36 is 32kHz±5kHz. The main PCB board (13) limits the output power of each ultrasonic generator (10) to 55~80% or less of its rated power in order to reduce the individual load and extend the service life.

5. The dual generator parallel ultrasonic cleaning machine of claim 3, wherein, The output power of each ultrasonic generator (10) is limited to 65-75% of its rated power.

6. The dual generator parallel ultrasonic cleaning machine according to any one of claims 1 to 5, characterized in that, Further includes: A ceramic heater (22) is placed below the stainless steel cleaning tank (7) and insulated from its bottom; a heater box (20) and a heater cover (19) encapsulate the ceramic heater (22); and ceramic insulation cotton (21) is sandwiched between the heater box (20) and the stainless steel cleaning tank (7).

7. The dual generator parallel ultrasonic cleaning machine of claim 5, wherein The two ultrasonic generators (10) are symmetrically offset from the center by 7mm, and the center distance is 106.6mm.

8. The dual generator parallel ultrasonic cleaning machine as defined in claim 6 wherein, Further includes: A capacitive sensing control board (27) is sealed and installed on the upper cover (4) by a control box cover (28) made of PETG material; and a forced air cooling fan (23) is fixed to the fan cover (24) and faces the main PCB board (13) and the capacitive sensing control board (27) to reduce the continuous operating temperature rise.

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