KR20060041370A - (a) condensing type dryer for having (a) function of earth leakage current detector - Google Patents

Abstract

The present invention relates to a condensation type dryer having a short-circuit detection function, and in a condensation type dryer having a motor and a heater, a key stroke for inputting a user request command, and a test stroke or A ground fault detecting unit for detecting a ground fault during a drying operation, a ground fault detecting unit for detecting a ground fault according to the ground fault level detected by the ground fault detecting unit, and a controller for outputting a control signal according to the ground fault state detected by the ground fault detecting unit; And a load driver for controlling the driving of the motor and the heater according to the control signal of the controller. Even if a ground fault occurs during normal operation of the dryer or other reasons, the dryer detects a short circuit itself. It can be blocked, and it has a reset function so that the microcomputer can always detect short circuit. In addition, it is possible to prevent the safety accident in advance by cutting off the load in the event of a short circuit, and by executing the short circuit test function by itself, it is possible to determine whether a circuit is broken.

Leakage / Condensation / Dryer

Description

Condensing Dryer with Earth Leak Detection {(A) condensing type dryer for having (a) function of earth leakage current detector}

1 is a cross-sectional view showing a typical condensation dryer.

Figure 2 is a block diagram showing the configuration of a condensation type dryer having a ground fault detection function according to the present invention.

3 is a block diagram showing a relay configuration of a condensation type dryer having a ground fault detection function shown in FIG. 2.

4 is a graph showing a load driving according to the occurrence of a short circuit.

<Description of the symbols for the main parts of the drawings>

100: a ground fault detector 110: a ground fault detector

120: microcomputer 130: load driving unit

140: heater 150: motor

160: display unit

TECHNICAL FIELD The present invention relates to a dryer, and more particularly, to a condensation type dryer having a ground fault detection function.

In general, a washing machine, a dryer or a combined washing machine provided with a drum device is a device using a rotational motion of a drum. That is, as the drum rotates, the laundry inside the drum also rotates, and the laundry rises and falls by the rotation.

For example, in the drum washing machine, a collision with the washing water occurs due to the rising and falling of the laundry, and the dirt on the laundry is removed by the collision.

In the case of a drum type dryer, a hot air generated by an electric heater or a gas combustion device is blown into a drum to absorb moisture remaining in a drying object and to dry the drying object.

The present invention relates to a dryer for drying laundry by rotation of a drum, hereinafter, a drum apparatus used in the dryer will be described as an example.

1 is a cross-sectional view schematically showing a condensing drum dryer.

Referring to Figure 1, the condensation-type drum dryer is configured to control the opening and closing of the cabinet 10, the cylindrical drum 12 formed inside the cabinet 10, and the drum 12 to form an appearance A door 13 and a belt 11 surrounding the outer circumferential surface of the drum 12 are included.

In addition, the motor shaft 21 is connected to the belt 11, the motor 17 is connected to the motor shaft to provide a rotational force, and the rotational force of the motor 17 is connected to the motor shaft 21 A cooling fan 16 that sucks and rotates the indoor air is included.                         

In addition, a drying fan 18 connected to the motor shaft 21 opposite the cooling fan 16 to circulate air inside the drum, and air sucked by the drying fan 18 may be connected to the drum ( As a passage to be moved to 12, the drying duct 19 is provided with a heat generating unit 20 therein.

In addition, a lint filter 14 formed below the opening through which the door 13 is inserted to filter foreign matter such as lint and the like contained in the wet air discharged from the drum, and air entering the lint filter 14 are condensers (not shown). It further includes a circulation duct 15 which is a passage to be moved to).

Referring to the operation of the condensation type dryer according to the prior art configured as described above are as follows.

First, when power is applied to the dryer, the motor 17 rotates, and the heater 20 attached to the drying duct 19 is heated. In addition, the belt 11 connected to the motor shaft 21 rotates to rotate the drum 12.

In addition, as the drum 12 rotates, the object to be dried inside the drum rotates along the inner wall of the drum and falls by its own weight when the drum 12 reaches the uppermost part. Here, the object to be dried is lifted by a lift (not shown) attached to the inner wall of the drum.

On the other hand, the drying fan 18 connected to the motor shaft 21 is operated with the rotation of the motor 17, the circulating air passing through the lint filter 14 is sucked. The sucked air rises along the drying duct 19 and becomes hot dried via the heater. Then, the hot dry air absorbs the moisture present in the object to be dried while passing through the drum, resulting in a high temperature and high humidity.

Subsequently, the hot and humid air is again filtered by the lint filter 14 and then moved to a capacitor (not shown) along the circulation duct 15.

In addition, the cooling fan 16 connected to the motor shaft 21 is rotated to suck the indoor air outside the dryer. The sucked indoor air is then passed through a cooling fan 16 to the condenser.

Here, the hot and humid air moved to the capacitor along the circulation duct 15 and the indoor air sucked by the cooling fan 16 and moved to the capacitor pass through the capacitor.

In addition, the hot and humid air and the indoor air are not mixed with each other by the shape of the capacitor, and only heat exchange occurs. Therefore, the high temperature and high humidity air is changed to low temperature and high humidity air while losing heat to the indoor air while passing through the condenser.

Then, as the temperature decreases, moisture contained in the air condenses and falls to the bottom of the condenser, and is moved to a sump (not shown) in which condensate is collected. In addition, the water moved to the sump is moved to a condensate reservoir (not shown) located at the top of the dryer by a condensation pump.

On the other hand, the indoor air passing through the capacitor takes the heat of the high temperature and high humidity air and converts it into low temperature and high humidity air, and the temperature becomes high.                         

Here, a sealing member (not shown) is attached to prevent the circulating air from leaking through the edge of the door while the circulating air passing through the drum is moved to the capacitor through the lint filter.

However, in the home using the conventional condensation type dryer configured as described above, the dryer itself has no function of detecting a short circuit, so it has no choice but to rely on a home earth leakage breaker installed in the home.

Therefore, in the case of such a general earth leakage breaker, the circuit breaker cuts off the power when a short circuit occurs, and at the same time, the power of the detection circuit is also cut off, which causes inconvenience of manually turning on the power switch when the reset command is input.

In addition, a short circuit occurring during the operation of the condensation type dryer may not be properly sensed due to a failure of the home earth leakage breaker or a poor grounding due to the use of a multi-tab. There was a problem that could be.

The present invention has been made to solve the above problems, the object of the present invention is to enable the condensation type dryer to detect a short circuit by itself.

In addition, there is another purpose to detect a short circuit by yourself to prevent safety accidents in advance.

In order to achieve the above object, a condensation type dryer having a short circuit detecting function according to the present invention includes a key input unit for inputting a user request command and a command input through the key input unit in a condensation type dryer having a motor and a heater. According to the ground fault detection unit for detecting a short circuit during a test stroke or drying administration, a ground fault detection unit for detecting the ground fault according to the ground fault level detected by the ground fault detection unit, and a control signal according to the ground fault state detected through the ground fault detection unit And a load driver for controlling driving of the motor and the heater according to the control signal of the controller.

Preferably, the ground fault detecting unit is configured as a zero current transformer.

More preferably, the ground fault detecting unit detects a ground fault current according to the amount of current sensed through the ground fault detecting unit.

More preferably, the load driver includes a plurality of relays for driving the motor and the heater selectively according to the control signal of the controller.

More preferably, the display unit may further include a display unit for indicating a short circuit occurrence or a load abnormal state according to a control signal of the controller.

Hereinafter, with reference to the accompanying drawings will be described in more detail a condensation type dryer having a short circuit detection function according to the present invention.                     

2 is a block diagram schematically illustrating a condensation type dryer having a short circuit detecting function according to the present invention, and FIG. 3 is a conceptual diagram illustrating a relay concept of the condensation type dryer having a short circuit detecting function according to the present invention shown in FIG. 2. 4 is a graph illustrating load driving according to a short circuit detection.

As shown in FIG. 2, the condensation type dryer having a short circuit detecting function according to the present invention has a key input unit (not shown) for inputting a user request command and a command input through the key input unit (not shown). A ground fault detecting unit 100 for detecting a ground fault during a test stroke or a drying stroke, a ground fault detecting unit 110 for detecting a ground fault according to the ground fault level detected by the ground fault detecting unit 100, and the ground fault detecting unit 110. A control unit 120 for outputting a control signal according to a ground fault state detected through the control unit, a load driver 130 for controlling driving of the motor 150 and the heater 140 according to the control signal of the control unit 120 and According to the control signal of the control unit 120, the display unit 160 for indicating a short circuit occurrence or a load abnormal state.

Here, the ground fault detecting unit 100 includes a zero current transformer, the ground fault detecting unit 110 is configured as an IC capable of detecting a ground current, and the heater 140 includes a plurality of heaters. 141 and 142.

In addition, as shown in FIG. 2, the first to third relays RLY1 and RLY2 turned on / off by a control signal output from the microcomputer 120 according to whether the ground fault detection unit 110 detects the ground fault. And (RLY3).

Therefore, when the user inputs a short circuit test command through the key input unit (not shown) or when a short circuit occurs during a drying administration according to a drying course selected through the key input unit (not shown), the ground fault detecting unit 100 ), Voltage change (VR-IN) occurs.

In general, when a short circuit does not occur, the amount of alternating current passing through the magnetic core of the ground fault detecting unit 100 is opposite in direction, but since the magnetic flux generated by the current cancels each other because the magnitude is the same, the electromotive force is "0". As a result of this detection, the current leakage difference unit 110 cannot detect the difference in current amount.

However, when a short circuit occurs, a difference in the amount of current applied to the ground fault detecting unit 100 occurs, so that an electromotive force other than "0" is sensed by the ground fault detecting unit 100, and accordingly the ground fault detecting unit 110 is detected. Detects leakage.

In addition, when a short circuit is not detected even when a user inputs a short circuit test command through the key input unit (not shown), an error of the short circuit detecting unit 100 or the heater 140 should be suspected.

That is, when power is applied, the ground fault detection unit 100 detects whether a voltage change occurs, and when a voltage change occurs, the ground fault detection unit 110 detects this and outputs it to the microcomputer 120. The load driver 130 may selectively shut off driving of the heater 140 and other loads (not shown) according to the ground fault detection input through the ground fault detector 110. The control signal is output to.

In addition, when a user inputs an earth leakage test command through the key input unit (not shown), the earth leakage detection unit 100 properly transmits a current amount that is sufficient to cause an electric leakage to the earth leakage detection unit 100. The microcomputer 120 determines whether the change can be transmitted to the microcomputer 120, and the microcomputer 120 determines whether the ground fault detecting unit 100 and the ground fault detecting unit 110 operate normally according to the result. have.

Accordingly, as shown in FIG. 4A, when a power is applied, a low signal is input from the ground fault detector 110 to the microcomputer 120, but primary and secondary ground faults are detected. It can be seen that a high signal is applied every time.

In addition, if a user inputs a reset command after detecting the first short circuit, as shown in FIG. 4 (b), after the first short circuit is detected, a reset is executed for a preset time (10 ms). The low signal is input, and when the preset time (10ms) elapses, the high signal is input again.

In addition, in the case of the first to third relays (RLY1), (RLY2), (RLY3), as shown in (c) of FIG. After a time, the relay drive is turned off, and the motor 150 stops the drive according to the control signal of the microcomputer 120 when the secondary leakage is detected from the ground fault detection unit 110.

As described above, the condensation type dryer having the earth leakage blocking function has the following effects.

First, even if a short circuit occurs during operation of the dryer due to lack of normal grounding or other reasons, the dryer may detect and cut off the leakage.

Second, it has a reset function so that the microcomputer can always detect whether there is a short circuit, and in the event of a short circuit, it can cut off the load to prevent safety accidents.

Third, by performing the ground fault test function, it is possible to determine whether or not the circuit is broken.

Claims (5)

In the condensation dryer with a motor and a heater, A key input unit for inputting a user request command; An electric leak detecting unit detecting an electric leak during a test stroke or a drying stroke according to a command input through the key input unit; A ground fault detector for detecting a ground fault according to a ground fault level detected by the ground fault detector; A control unit which outputs a control signal according to the ground fault state detected by the ground fault detection unit; And, Condensation type dryer having a leakage detection function, characterized in that it comprises a load driver for controlling the driving of the motor and the heater according to the control signal of the controller. The method of claim 1, And a ground fault detecting unit configured of a zero current transformer. The method of claim 1, And the ground fault detecting unit detects a ground fault current according to the amount of current sensed through the ground fault detecting unit. The method of claim 1, The load driving unit A condensation type dryer having a ground fault detection function, characterized in that it comprises a plurality of relays for driving the motor and the heater selectively driven according to the control signal of the controller. The method of claim 1, And a display unit for indicating a short circuit occurrence or other load abnormality according to the control signal of the controller.

Images