KR100300857B1 - Induction heating apparatus of washing machine - Google Patents

Abstract

PURPOSE: An induction heating apparatus of a washing machine is provided to prevent the corrosion of heater by providing a heater on an external wall surface of an outer water tank. CONSTITUTION: A plurality of magnetic field generating units(8,9) generate a high frequency magnetic field in an external wall of the washing machine comprised of an inner water tank(1) made of a magnetic material and an outer water tank(2) made of a plastic. An inverter(10) supplies a high frequency current for generating an inductive magnetic field in the magnetic field generating units(8,9). A control unit(5) controls the inverter(10) to maintain a predetermined water temperature. The magnetic field generating units(8,9) is comprised of coils(8a,9a) for generating the inductive magnetic field and ferrites(8b,9b) for absorbing the magnetic field that are generated in the coils(8a,9a) to be transmitted to the external side of the outer water tank(2).

Description

Induction heating device of washing machine

1 is a schematic view of a conventional heating washing machine.

2 is a block diagram of the induction heating laundry machine of the present invention.

3 is a principle diagram for explaining the induction heating of FIG.

4 is an installation example according to the number of installation of the induction heating coil of FIG.

5 is an installation example according to the connection method of the induction heating coil of FIG.

* Explanation of symbols for main parts of the drawings

1: inner tank 2: outer tank

3: temperature sensor 4: heater

5: temperature control unit 6: washing machine driving unit

7: pulsator 8, 9: magnetic field generator

10: inverter

The present invention relates to a washing water heating apparatus of a washing machine, in particular to enable the corrosion control of the washing tank and precise control of the water temperature by using an induction heating apparatus.

1 is a schematic configuration diagram of a conventional washing water heating apparatus, which includes a water tank (1) rotatable to contain water and laundry, and is separated from the water tank by a predetermined interval and flows in and out through a hole drilled in the water tank. It consists of an external water tank (2) fixed to hold water, and in particular, the temperature sensor (3) for detecting the temperature of the wash water is attached to the wall of the external water tank, and the temperature of the wash water inside the external water tank The heater 4 for adjusting is located, the temperature sensor 3 and the heater 4 is connected to the temperature control device 5 outside the washing tank.

In addition, a pulsator for generating a vortex of the washing water at the lower end of the inner tank is connected to the washing machine driving unit 6 outside the washing tank.

Looking at the washing operation by the washing water heating of the washing machine configured as described above are as follows.

First, when the pulsator 7 driven by the washing machine drive unit 6 rotates at a high speed in the inner water tank 1 into which laundry laundry and detergent are mixed, strong water flow is issued to wash the laundry.

By the way, it is necessary to increase the temperature of the washing water in order to increase the washing performance in the washing process, the heating process is to set the temperature of the washing water first in the temperature control unit 5, accordingly in the outer tank (2) Heat is generated in the heater 4 to raise the temperature of the wash water.

The temperature information converted according to the heating of the heater is sensed by the temperature sensor 3 and input to the temperature control unit 5, the temperature control unit 5 is the temperature input from the temperature sensor 3 is set When the temperature is reached, the operation of the heater 4 is cut off.

When the heater 4 is heated as described above, the thermal efficiency problem, which is a problem, is solved by applying an input method in which the washing water directly contacts the heater, and the water temperature control sets the water temperature detected by the water temperature sensor 3. Compared to temperature, the relay connected to the heater was energized and controlled.

However, since the washing water is heated by the washing water heating device, the input heater is in direct contact with the washing water, and the washing water is denatured to alkaline, not neutral, due to detergents of various chemical components included in the washing water, which corrodes the heater. Problems may occur, which may cause fatal problems such as a short circuit, fire, and device damage.

Therefore, the present invention is to solve the above problems by supplying heat to the wash water through induction heating on the outer wall surface of the outer tank without placing the heater in the outer tank.

The object of the present invention is a plurality of magnetic field generating means for generating a high frequency magnetic field in the outer wall of the washing machine having a water tank made of a magnetic material and the outer tank made of plastic, and a high frequency current for generating a magnetic field in the magnetic field generating means. It can be achieved by configuring an inverter to supply, and a control means for controlling the inverter to maintain a set water temperature, the magnetic field generating means is a coil for generating an induction magnetic field, and generated from the coil to the outside of the external tank The ferrite for absorbing the magnetic field is installed outside the coil, the magnetic field generating means is located between the water level when a minimum amount of laundry is put from the bottom of the inner tank, the coil is configured in series or parallel connection to the inverter This can be achieved by doing so.

2 is a schematic configuration diagram of the induction heating apparatus of the present invention, which includes an inner water tank 1 of a magnetic material, an outer water tank 2 of a nonmagnetic material, a pulsator 7, a driving part 6, and a temperature sensor ( In the configuration of 3), the magnetic field generator 8 installed on the outer wall surface of the outer tank, the inverter 10 connected to the magnetic field generator 8, and the temperature control unit 5 for controlling the inverter The magnetic field generating part 8 is composed of an induction heating coil 8a and a ferrite 8b.

The operation and effects of the induction heating apparatus of the present invention configured as described above will be described with reference to FIGS. 2 to 5.

When the temperature is set in the display unit outside the washing machine to wash at a predetermined set temperature, the set temperature is input to the control unit 5, and the recess 5 is inputted from the set temperature and the temperature sensor 3. By comparing the temperature of the current wash water, if the temperature of the wash water and lower than the set temperature, and outputs a control signal to the inverter unit 10 to increase the temperature of the wash water.

In accordance with the control signal of the control unit, the inverter unit 10 supplies a high frequency current having a frequency of several tens of KHZ to the coils 8a and 9a of the magnetic field generating units 8 and 9, thereby generating an induction magnetic field. Passing the outer tank (2) will generate its own eddy current in the inner tank (1), which is a magnetic body.

The eddy current generated in the inner tank 1 flows through the inner surface of the inner tank metal, and the electric current is disturbed by the resistance component present in the inner tank metal, and heat is generated.

The inner water tank 1 which generates heat by this induction process is surrounded by being in direct contact with the wash water, thereby enabling high efficiency heating.

On the other hand, among the magnetic fields generated by the induction heating coil, the magnetic fields directed toward the outside rather than the inside of the external water tank 2 are transferred to the ferrites 8b and 9b provided outside the induction coils 8a and 9a of the magnetic field generating sections 8 and 9. Unlike metal, this ferrite hardly loses energy due to the magnetic field, so that the ferrite has little loss due to the magnetic field directed to the outside and is excellent in efficiency.

The induction heating is described in more detail with reference to FIG. 3 as follows.

When a high frequency alternating current flows through the induction heating coil, a magnetic flux is generated around the coil.

The magnetic flux lines escaping upward of the heating coil pass through the metal plate located above and generate high frequency current in the metal.

When this current flows, the metal itself is heated due to the resistance component inside the metal material.

On the other hand, the magnetic flux flowing out of the heating coil is absorbed by the ferrite having a strong magnetic flux absorbing power and less energy consumption, so there is almost no energy loss due to the magnetic flux flowing down.

FIG. 4 is a diagram limiting various installation examples according to the number of induction heating coils. As shown in (a), FIG. 4 is mounted at 180 ° for two installations and 120 as in (b) for three installations. Each coil may be mounted at an angle of °, and in the case of four installations as shown in (c), the coil may be mounted at an angle of 90 °.

5 is an installation example according to a method of connecting an induction heating coil, and a plurality of coils may be serially connected to the inverter 10 as in (a) or in parallel as in (b).

As described above, since the induction heating coil of the present invention can heat the washing water without directly contacting the washing water, the risk of corrosion can be eliminated by a conventional heater, and since the heat source for heating the washing water is a water tank, the heater Since high efficiency can be obtained and the output of the inverter can be freely adjusted, it is possible to precisely control the water temperature.

Claims (3)

A plurality of magnetic field generating means for generating a high frequency magnetic field in an outer wall of a washing machine having an inner water tank made of magnetic material and an outer water tank made of plastic; An inverter for supplying a high frequency current for generating an induction magnetic field in the magnetic field generating means; Induction heating apparatus of the washing machine, characterized in that configured as a control means for controlling the inverter to maintain a set water temperature. The method of claim 1, The magnetic field generating means includes a coil for generating an induction magnetic field; Induction heating apparatus of the washing machine, characterized in that consisting of ferrite for absorbing the magnetic field generated in the coil to the outside of the outer tank. The method of claim 1, Induction heating apparatus of the washing machine characterized in that the magnetic field generating means is located between the water level when the minimum amount of laundry from the inner end of the tank.