KR20040047193A - heater control apparatus of washing machine - Google Patents

Abstract

PURPOSE: A control apparatus for a heater of a washing machine is provided to prevent the laundry from damaging by interrupting supply of power when the heater is overheated with a second safety device. CONSTITUTION: A control apparatus for a heater(Hx) of a washing machine includes a duct, a first safety device(S1) and a second safety device(S2). The duct is installed to the heater to exhaust hot air. The first safety device stops supply of power not to reach first set temperature on the heater. The second safety device interrupts supply of power to the heater when temperature of heater reaches a second set temperature which is higher than the first set temperature when the first safety device is misoperated. Thereby, damage of the laundry is prevented and a safety accident due to overheating is prevented.

Description

Heater control apparatus of washing machine

The present invention relates to a washing machine for supplying hot air into a drum having a heater built-in to dry laundry after washing, and more particularly, a washing machine capable of preventing safety accidents by cutting off power supplied when the heater is overheated. It relates to a heater control device.

In general, a washing machine is a device that removes dirt by putting laundry in contact with dirt in a washing tank and applying washing and rinsing, dehydration and drying by applying an appropriate detergent and mechanical force.

1 is a side cross-sectional view showing a drum washing machine according to the prior art.

As shown in FIG. 1, the drum washing machine according to the related art has a tub 10 supported by a spring 4 and a damper 5 inside the cabinet 2, and a laundry provided inside the tub 10. A drum (11) on which laundry is placed for cleaning, a door (13) connected to the cabinet (2) to open and close the front of the drum (11), the front of the tub (10) and the cabinet (2). Is installed between the gasket 12 to buffer the vibration during the rotation of the drum 11 while the role of the packing so that the washing water does not flow out when the door 13 is closed, and one side is the lower side of the tub 10 Connected to the condensation duct 20 to discharge the humid air inside the tub 10, the drying duct connected to the condensation duct 20, the heater 31 and the blower fan is built so as to discharge the hot air therein ( 30) is installed. The drying duct is provided with a heater control device for preventing overheating of the heater.

2 is a circuit diagram schematically showing a heater control apparatus of a washing machine according to the prior art, wherein the symbols Ho, Co, So, and Po used herein mean a heater, a microcomputer, a thermostat, and a power source.

That is, the heater Ho is operated by being connected to a power source, and the temperature of the heater Ho is controlled by a microcomputer Co connected to one side and operated below a safety temperature.

In addition, the heater Ho configured as described above is provided with a heater control device for turning on / off the power supplied to the circuit to prevent overheating of the heater when the microcomputer Co malfunctions.

The heater control device is connected in series on the circuit line of the heater (Ho), and generally consists of a thermostat (So) attached to two metal pieces having different expansion indices for heat, and the metal pieces thermally expand due to a temperature difference when overheated. The exponent bends low and shorts the circuit.

However, the heater control apparatus of the washing machine according to the prior art melts the microcomputer and the thermostat due to rapid overheating, so that the circuit is not shorted. Thus, the temperature of the drying duct cannot be controlled and the laundry may be damaged by the high temperature. , There is a problem that a safety accident occurs even in the washing machine fire.

The present invention has been made to solve the above-mentioned problems of the prior art, the second safety means for shutting off the power supplied to the heater when the primary safety means consisting of the thermostat is impossible to normal operation by overheating In order to provide a heater control device of a washing machine, the laundry is not damaged by cutting off the power supply when the heater is overheated, and safety accidents are prevented.

1 is a side cross-sectional view showing a drum washing machine according to the prior art,

2 is a circuit diagram schematically showing a heater control apparatus of a washing machine according to the prior art;

Figure 3 is a side sectional view showing a drum washing machine according to the present invention,

4 is a circuit diagram schematically showing a heater control apparatus of a washing machine according to the present invention;

5 is an exploded perspective view showing a heater control apparatus of the washing machine according to the present invention;

Figure 6 is an enlarged plan view of the main portion of the heater control apparatus of the washing machine of the drum washing machine according to the present invention.

<Explanation of symbols on main parts of the drawings>

52: cabinet 60: tub

61 drum 62 gasket

63: door 65: lifter

67 motor 69 drain pump

70: condensation duct 75: blowing fan

80: drying duct 82: lower duct

83: duct connection hole 84: duct outlet

85: lower rib 86: upper rib

87: upper duct 89: pocket portion

90, S2: Second safety means 91: Temperature fuse

92: first wiring 94: second wiring

96: insulated tube 98: connection terminal

Hx: Heater Cx: Micom

S1: primary safety measures

The heater control apparatus of the washing machine according to the present invention for solving the above problems is a first safety to control the power supply so that the heater is mounted to discharge hot air, and the temperature of the heater does not reach the first set temperature. Means and second safety means for shutting off power supplied to the heater when the temperature of the heater reaches a second set temperature higher than the first set temperature when the first safety means malfunctions.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a side sectional view showing a drum washing machine according to the present invention.

As shown in FIG. 3, the drum washing machine according to the present invention has a tub 60 horizontally installed by a spring 54 and a damper 55 inside the cabinet 52 having the front open, and the tub ( 60, a drum 61 for cleaning the laundry cloth is rotatably installed inside the drum 61, and a plurality of lifters 65 are formed inside the drum 61 to lift and drop the laundry cloth to a predetermined height. A motor 67 is installed at the lower side of the motor 60 to forward and reverse rotation, and pulleys are installed at the rotation shafts 67a and 61a of the motor 67 and the drum 61 to provide a belt 68. And forward and reverse rotation of the motor 67 to the drum 61, and a drain pump 69 is disposed below the tub 60 to drain the washing water in the tub 60 to the outside. A connected drain hose 69a is connected, and a control panel 57 having a control part is provided above the cabinet 52. Is value.

In addition, a door 63 is installed in the cabinet 52 to open and close the front of the drum 61, and the washing water is closed when the door 63 is closed between the front surface of the tub 60 and the cabinet 52. The gasket 62 is provided to cushion the vibration during the rotation of the drum 61 while acting as a packing to prevent leakage.

In addition, one side of the tub 60 is connected to a condensation duct 70 in which one side of the tub 60 is sucked in the humid air and condensed with moisture, and the upper side of the tub 60 is connected to the tub 60. A drying duct 80 having a heater 81 therein, which is connected to the condensation duct 70 and heats the air sucked to discharge the hot air into the drum 61, is installed. Here, a blower fan 75 is installed at one side of the drying duct 80 to smoothly blow air. In addition, the drying duct is provided with a heater control device for preventing overheating of the heater.

4 is a circuit diagram schematically showing a heater control apparatus of a washing machine according to the present invention, wherein the symbols Hx, Cx, S1, S2, and Px used are heaters, micoms, primary safety means, and secondary safety means, respectively. And power.

Here, the heater (Hx) is connected to the power source is operated, the temperature of the heater (Hx) is controlled by the microcomputer (Cx) connected to one side is operated below the safe temperature.

In addition, the heater (Hx) configured as described above, the first safety means (S1) and the second safety means (S2) for shutting off the power supplied to the circuit to prevent overheating of the heater when the microcomputer (Cx) malfunctions. Heater control device consisting of) is shown.

The first safety means (S1) is connected in series on the circuit line of the heater (Hx) to turn on / off the power supply so that the temperature of the heater (Hx) is maintained below the first set temperature, the first The vehicle safety means (S1) is generally composed of a thermostat attached to two metal pieces having different expansion indices for heat, and the metal pieces bend toward the lower side of the thermal expansion index due to a temperature difference when overheating and short-circuit the circuit.

In addition, the second safety means (S2) when the temperature of the heater (Hx) reaches a second set temperature higher than the first set temperature when the thermostat (S1) is stuck to the circuit line by overheating the The power supplied to the heater Hx is cut off.

Here, the second set temperature is set to a temperature higher than the first set temperature, for example, the first set temperature is set to 150 ℃, the second set temperature is set to 240 ℃.

5 is an exploded perspective view showing a heater control apparatus of the washing machine according to the present invention, Figure 6 is an enlarged plan view of the main portion of the heater control apparatus of the washing machine of the drum washing machine according to the present invention.

The drying duct having the heater control device configured as described above is implemented as shown in FIGS. 5 and 6, wherein the drying duct 80 has a duct connection hole 83 connected to the condensation duct 70 at one end thereof. The lower duct 82 is formed integrally with the duct outlet 84 connected to the gasket 62 at the other end, and the upper duct 87 covering the upper portion of the lower duct 82.

An upper rib 86 is formed around the lower end of the upper duct 87, and a plurality of bolt holes 86a are formed in the upper rib 86, and a lower portion is formed around the upper end of the lower duct 82. A rib 85 is formed and a bolt groove 85a corresponding to the bolt hole 86a is formed in the lower rib 85 so that the upper duct 87 and the lower duct 82 are fastened as bolts. do.

Herein, the heater 81 is an electric heater whose temperature is controlled by the microcomputer of the controller. The upper duct 87 and the lower duct 82 are formed with semi-circular grooves 76a and 76b, respectively, so that the upper duct ( 87 and the lower duct 82 is inserted into the heater insertion hole 76, 77 is formed when the wiring is connected.

The drying duct 80 configured as described above may be damaged or laundry when the heater 81 is overheated. Therefore, the drying duct 80 is connected to the heater and the power supply in series so as to cut off the power supply when the heater 81 is overheated. The first safety means (not shown) and the second safety means 90 made of a thermostat are attached.

On the other hand, the drying duct 80 is formed integrally with one side pocket portion 93 on which the second safety means 90 is seated, wherein the pocket portion 93 is the side surface of the drying duct 80 Is formed.

The second safety means (90) includes a first fuse (92) connected to the heater (81), a temperature fuse (91) connected to the first interconnect (92) and melted at a second set temperature; A second wiring 94 connected to the temperature fuse 91 and connected to a power source, and an insulating tube 96 covering the first and second wirings 92 and 94 and the temperature fuse 91 to be insulated from each other. It is composed.

Here, the temperature fuse 91 is made of a material that is melted and shorted at a predetermined temperature or more so that the laundry is not damaged due to overheating of the heater 81 or a fire occurs in the washing machine. ) To break the circuit to which power is supplied.

In the present invention, the insulating tube 96 is made of silicon that is not energized.

In addition, the secondary safety means 90 is provided with a connection terminal 98 connected to the heater or the power source, respectively, at an end thereof so as to be replaced and reused when the temperature fuse 91 is melted.

Looking at the operation of the present invention configured as described above are as follows.

After opening the door 63 installed in the front of the cabinet 52 and putting laundry into the drum 61, the door 63 is closed and washed.

Then, when the washing is completed, the wash water used for washing is drained to the outside by operating the drain pump 69 installed in the drain hose (69a), supplying clean wash water to rinse the laundry, the drum By rotating the high speed 61, the water contained in the laundry is dehydrated using centrifugal force.

Then, the drum 61 is rotated at a low speed to heat the blower fan 75 and the heater 81 to supply hot air into the tub 60.

The heating temperature of the heater 81 is controlled by a microcomputer to blow hot air at a temperature that does not damage the cloth.

Here, when the temperature of the heater 81 cannot be controlled due to the failure of the microcomputer, the thermostat is expanded by heat and cuts off the power supply.

On the other hand, if the thermostat adheres to the wiring circuit due to rapid overheating, the temperature fuse 91 is melted and short-circuited by heat to block the power supply to the heater 81.

As described above, the heater control apparatus of the washing machine according to the present invention has been described with reference to the illustrated drawings. Various modifications can be made, including, of course.

The heater control apparatus of the washing machine according to the present invention configured as described above includes a secondary safety means for shutting off the power supplied to the heater when the heater is overheated when the primary safety means is inoperative. In case of overheating, even when the first safety means is not operated, the power of the heater is cut off, thereby preventing damage to laundry and there is an advantage of preventing safety accidents due to overheating.

In addition, there is an advantage that the connection terminal is provided in the connection portion of the secondary safety means can be easily installed and replaced.

Claims (4)

A duct fitted with a heater to discharge hot air, First safety means for controlling power supply so that the temperature of the heater does not reach a first set temperature; Washing machine comprising a second safety means for shutting off the power supplied to the heater when the temperature of the heater reaches a second set temperature higher than the first set temperature when the first safety means malfunctions Heater control device. The method of claim 1, The second safety means is a heater control device of the washing machine, characterized in that connected in series with the heater. The method according to claim 1 or 2, The second safety means includes a first wiring connected to the heater, A temperature fuse connected to the first wiring and melted at a second set temperature; A second wiring connected to the temperature fuse and connected to a power source; Heater control apparatus of the washing machine comprising an insulating tube covering the first, second wiring and the temperature fuse to insulate the circuit. In the third, The second safety means is a heater control device of the washing machine, characterized in that further comprising a connecting terminal connected to the wiring connected to the heater or the power source at the end so as to be replaceable.