RU53676U1 - ULTRASONIC WASHING DEVICE (OPTIONS) - Google Patents

Abstract

The utility model relates to household appliances and is intended for use in devices for acoustic activation of liquid media, mainly during washing. An ultrasonic washing device comprises a power supply unit, an ultrasonic frequency generator and an ultrasonic emitter connected in series. The ultrasonic frequency generator is powered by direct current, the voltage of which is equal to the voltage of the household electrical network, and its electrical circuit is made on high-voltage switching transistors, connected by a half-bridge, and controlled by the driver of the upper and lower keys, containing an integrated generator connected to an external timing device. In another embodiment, the ultrasonic washing device comprises a serially connected power supply, an ultrasonic frequency generator, an ultrasonic emitter, and the generator circuitry is made on a microcontroller that digitally generates the operating frequency and generates control pulses for the driver of the upper and lower keys that control the external high-voltage switching transistors.

Description

The utility model relates to household appliances and is intended for use in devices for acoustic activation of liquid media, mainly during washing.

Known household ultrasonic devices for washing clothes, including a circuit for converting the supply voltage of the mains, an electric oscillation generator and an acoustic emitter containing a piezoceramic element (RF patent No. 2116396, publ. 1998, RF patent No. 2152121, publ. 2000, RF patent No. 2200780, publ. 2003).

Also known is an ultrasonic device for washing clothes, containing an electric oscillation generator connected to a power source and an acoustic emitter with a vibrator made in the form of a piezoceramic element. The generator of electrical vibrations is made in the form of a source of acoustic oscillations of a oscillating frequency in the frequency range f _H -f _B (RF patent No. 2109095, publ. 1998).

The basis of the known ultrasonic washing devices is the principle of preliminary lowering the supply alternating voltage, converting it into a direct current of low voltage, converting this current by an analog ultrasonic generator into a high-frequency signal, and then increasing the received signal to the level necessary for the operation of the ultrasonic emitter. All these transformations lead to a decrease in the efficiency of ultrasonic devices,

decrease in the intensity of the ultrasonic field, unstable operation of ultrasonic erasers.

A known generator designed for use in a portable device with a piezoceramic emitter (patent RF No. 2210174, publ. 2003).

The known device has a high efficiency due to the operation of the generator at the resonant frequency of the emitter.

A disadvantage of the known device is the large number of discrete elements, winding products and the complexity of tuning the generator to the resonant frequency of the emitter.

The task of creating this utility model is to increase the efficiency of the ultrasonic washing device and increase the power supplied to the ultrasonic emitter.

The essence of the proposed utility model is as follows.

An ultrasonic washing device comprises a power supply unit, an ultrasonic frequency generator and an ultrasonic emitter connected in series. The ultrasonic frequency generator is powered by direct current, the voltage of which is equal to the voltage of the household electrical network, and its electrical circuit is made on high-voltage switching transistors, connected by a half-bridge, and controlled by the driver of the upper and lower keys, containing an integrated generator connected to an external timing device.

The ultrasonic frequency generator can be performed on the driver of the half-bridge and high-voltage switching transistors integrated in a single housing.

The ultrasonic frequency generator may further comprise a bias unit of the main operating frequency from 20 kHz to 60 kHz with a swing frequency of 4-5 Hz.

In another embodiment, the ultrasonic washing device comprises a serially connected power supply, an ultrasonic frequency generator, an ultrasonic emitter, and the generator circuitry is made on a microcontroller that digitally generates the operating frequency and generates control pulses for the driver of the upper and lower keys that control the external high-voltage switching transistors.

In both versions, between the output of the generator and the emitter, an electronic self-diagnosis unit can additionally be placed.

Figure 1-3 presents embodiments of block diagrams of an ultrasonic washing device.

The ultrasonic washing device shown in Fig. 1 contains a power supply 1, an ultrasonic frequency generator 2, an ultrasonic emitter 3. An electric generator 2 includes a half-bridge driver 4, a block of high-power high-voltage switching transistors 5 and a transformer 6. The half-bridge driver 4 is controlled by an external timing device 7.

The device operates as follows.

The power supply unit 1 converts an alternating mains voltage of 220 V into a constant voltage of 220 V, which is subsequently converted by switching transistors into alternating voltage of a high frequency. The half-bridge driver 4 has a built-in generator, the frequency of which is determined by an external time-setting device 7, which includes an RC circuit, and provides control of the upper and lower keys of the half-bridge circuit. The frequency is set by the parameters of the RC circuit, which is calculated according to the standard formula for

each particular type of half-bridge driver used. The transformer 6 provides galvanic isolation from the network and coordination with the load 3, made in the form of an ultrasonic emitter with a working element of ferroelectric piezoceramics based on a solid solution of lead zirconate-titanium sealed with a compound.

Used for domestic purposes, ultrasonic devices for washing clothes have a low sound intensity. This makes it possible to use a functionally identical driver integrated with transistors in one housing instead of a half-bridge driver 4 and a block of powerful transistors 5. This allows you to minimize the dimensions of the ultrasonic device for washing clothes, reduce the complexity of its assembly and increase the reliability of the entire device.

Based on the acoustic capillary effect, the washing process occurs due to the passage of ultrasonic waves through the liquid medium and promotes the impregnation of tissue with a solution of surfactants. The fluctuation of microflows that occurs in a liquid leads to more active mixing of the washing solution at the surface of the erased products, if the medium is affected by ultrasound of a sweeping frequency.

Figure 2 shows a block diagram of an ultrasonic device for washing clothes, which provides acoustic ultrasonic vibrations of variable frequency in the range of 20-60 kHz with a swing frequency of 4-5 Hz. The device differs from that shown in figure 1 by the presence of block 8, which sets the offset of the main operating frequency to the upper and lower limits of the range and the swing frequency. Block 8 includes a sawtooth voltage generator with a signal frequency of 4-5 Hz and a multivibrator operating at a variable frequency of 20-60 kHz.

This scheme is quite simple to implement, but does not have the ability to dynamically adjust the swing frequency and range of operation, which is necessary for high-quality washing of tissues of different densities.

Figure 3 shows the implementation of the circuit of another embodiment of an ultrasonic device for washing clothes, where the frequency parameters are set by a programmable microcontroller, which allows you to set various modes of operation of the device. This leads to a deeper penetration of surfactants into the structure of the fabric and, consequently, to increase the quality of the product to be washed off and to reduce the washing time.

The ultrasonic washing device shown in FIG. 3 comprises a power supply unit 9, an electric oscillation generator 10, an ultrasonic emitter 3, a mode and indication selection unit 11, a current sensor 15. The electric oscillation generator 10 includes a microcontroller 13, an upper and lower key driver 14, a block high-power high-voltage switching transistors 15, transformer 16.

The device proposed in FIG. 3 works as follows.

The power supply unit 9 provides the rectification of an alternating mains voltage of 220 V into a constant voltage of 220 V and the formation of a low-voltage voltage for operation of the microcontroller 13 and the driver of the upper and lower keys 14. The microcontroller 13 receives control signals from the operation mode and indication unit 11 and, in accordance with them, generates control pulses for the driver of the upper and lower keys 14, which controls the external high-voltage switching transistors 15. The microcontroller 13 also sets the operating time of the device in accordance Corollary to the selected mode and display mode in block 11. The resulting signals from the microcontroller 13, current sensor 12 and processed

The ultrasonic device for washing clothes has the ability to track changes in the load and form an overload protection.

Also, the presented circuits may contain a self-diagnostic device 17 - “SDS Nevoton” (application for ПМ 2005133471, a decision on the grant of a patent dated 11.29.05), containing an LED and a system of resistors connected to each other with the possibility of measuring the voltage drop on block resistors. The self-diagnosis device 17 monitors the performance of all systems of the ultrasonic device for washing clothes.

The proposed options for an ultrasonic device for washing clothes, due to the simplification of the network voltage conversion circuit and the use of a digital ultrasonic frequency synthesizer with a transistor key driver, increase the efficiency and intensity of the ultrasonic field in the washing medium, the quality and productivity of washing, cleaning, and disinfection while ensuring high reliability of the ultrasonic device .

Declared as a useful model, the device allows to increase the efficiency of the ultrasonic device for acoustic activation of liquid media and the power supplied to the ultrasonic emitter. This is achieved by eliminating from the power supply circuit of ultrasonic washing devices a step-down voltage converter of the mains voltage and the use of high-voltage switching transistors as an ultrasonic generator, included by a half-bridge controlled by an upper and lower key driver.

Claims (6)

1. An ultrasonic washing device containing a serially connected power supply, an ultrasonic frequency generator, an ultrasonic emitter, characterized in that the ultrasonic frequency generator is powered by direct current, the voltage of which is equal to the voltage of the household electrical network, and its electrical circuit is made on high-voltage switching transistors connected by a half-bridge , and managed by the driver of the upper and lower keys, containing a built-in generator connected to an external timing device woo. 2. The device according to claim 1, characterized in that the ultrasonic frequency generator is made on an integrated driver of a half-bridge and high-voltage switching transistors integrated in a single housing. 3. The device according to claim 1, characterized in that the ultrasonic frequency generator further comprises a bias unit for the main working frequency from 20 to 60 kHz with a swing frequency of 4-5 Hz. 4. The device according to any one of claims 1 to 3, characterized in that between the output of the generator and the emitter is placed an electronic self-diagnosis unit. 5. An ultrasonic washing device containing a serially connected power supply unit, an ultrasonic frequency generator, an ultrasonic emitter, characterized in that the generator circuitry is made on a microcontroller that digitally generates an operating frequency and generates control pulses for the upper and lower key driver that controls the external high-voltage switching transistors. 6. The device according to claim 5, characterized in that between the output of the generator and the emitter is placed an electronic self-diagnosis unit.