KR100819594B1 - Safety device for dryer - Google Patents

Abstract

A safety device of a dryer is provided to prevent overheat of a heater by stopping a dry process if a failure of a thermostat is detected. A safety device of a dryer comprises a temperature control unit, a judging unit, a connection line, a display unit(9b), an operation stopping unit(90c), and a storage unit(90d). The temperature control unit is mounted close to a heater(30), and turned on and off according to the temperature of air flow. The judging unit judges operation of the temperature control unit according to on/off state of the temperature control unit. The connection line connects the temperature control unit with the judging unit. The display unit displays operational possibility of the temperature control unit. The operation stopping unit communicates with the judging unit to stop a dry process of the dryer, and turns off the heater and a motor of the dryer. The storage unit stores operational possibility.

Description

Safety device for the dryer {SAFETY DEVICE FOR DRYER}

1 is a configuration diagram of a safety device of a conventional dryer.

2 is a cross-sectional view of the dryer according to the present invention.

3 is an exploded perspective view of the dryer according to the present invention.

4 is a partial cutaway view of a dryer according to the present invention.

5 is a block diagram of a safety device of a dryer according to the present invention.

6 is an embodiment of the sensing circuit of FIG. 5.

7 and 8 are graphs of output waveforms of the sensing circuit.

9 is an on / off graph recognized by the microcomputer.

10 is a driving flowchart of the safety device of the dryer according to the present invention.

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

9a: input section 9b: display section

30: heater 72: motor

80: detection circuit 90: microcomputer

The present invention relates to a dryer, and more particularly, to a safety device of a dryer for notifying a user of a failure of a thermostat built in a dryer.

In general, a dry washing machine includes a main body having a predetermined shape, a drum installed inside the main body, a toughness surrounding the drum and collecting wash water, a driving motor for rotating the drum, and a detergent container for injecting detergent. And a water supply pipe connected to the detergent container for supplying the washing water or the washing water mixed with the detergent of the detergent container, a drain pipe for discharging the washing water used in the washing stroke to the outside, and forcibly draining the washing water connected to the end of the drain pipe. It consists of pump and drain hose.

Such a washing machine having a drying function is to wash laundry by friction with the washing water generated by dropping the laundry feeling and washing water into the drum and the washing feeling falling in the direction of gravity when the drum is rotated. In recent years, such a drum washing machine has been added to its function to dry not only laundry but also dry laundry by hot air.

The dry washing machine as described above may be further divided into condensation type and exhaust type, and the condensation type sends heat generated by the heater to the drum side by a blowing fan to dry the laundry in the drum. At this time, the air in the drum drying the laundry is in a high temperature and high humidity state and is moved to the exhaust port communicating with the tub. At this time, a nozzle for injecting cold water is installed at one side of the exhaust port to remove moisture from the high temperature and high humidity air to supply dry air to the blower fan again.

In the exhaust type, the hot air generated by the heater and the blower fan is passed through the laundry in the drum, and then the hot air is discharged to the outside of the washing machine through the exhaust port formed at one side of the washing machine. Here, the exhaust port is connected by a corrugated hose that is connected to the tough, the exhaust port serves as a pore when the infant or pet is trapped in the washing machine.

In such a washing machine having an exhaust type drying function, lint (fine lint) is generated in the dryness of the laundry. The lint circulates along the hot air from the drum in the washing machine and is discharged out of the washing machine along the exhaust port.

Lint filter in the exhaust port to prevent lint from blocking the exhaust port due to long-term use of the washing machine by providing a structure that can collect the lint regularly so that lint generated from the feeling of washing after washing does not accumulate in the exhaust outlet discharged to the outside of the washing machine Is fitted.

1 is a configuration diagram of a safety device of a conventional dryer. As shown in FIG. 1, the safety device of the dryer includes a heater 110 for generating heat by receiving external commercial power, and a first thermostat TS1 and a second thermostat for supplying external commercial power to the heater 110. It consists of a stat TS2.

The first thermostat TS1 is a mechanical switch that cuts off the power when the temperature around the heater 110 reaches a predetermined temperature or more, and once it is turned off, the first thermostat TS1 does not automatically return to the on state. On the other hand, the second thermostat TS2 is also a mechanical switch that cuts off the power supply when the temperature around the heater 110 is higher than or equal to a predetermined temperature and resumes supply of power when lowering to or lower than the predetermined temperature. Usually, the first thermostat TS1 is mounted in case the second thermostat TS2 does not operate normally.

The safety device of the conventional dryer does not include a configuration that can recognize the failure or notify the user when the first and second thermostats TS1 and TS2 described above fail. Therefore, when the user breaks down the first thermostat TS1 and the second thermostat TS2, an overheating problem of the heater 110 and a fire occurrence problem may occur due to the overheating.

In order to solve this problem, it is an object of the present invention to provide a safety device for a dryer informing the user by determining the failure of the thermostat.

Further, an object of the present invention is to provide a safety device for a dryer that solves an overheating problem such as a heater by stopping a drying operation according to a failure of a thermostat.

In addition, it is an object of the present invention to provide a safety device for a dryer that continuously displays the failure of the thermostat so that the user can take action or repair thereof.

The safety device of the dryer of the present invention comprises a temperature control unit that is on / off in accordance with the temperature of the air flow path, and a determination unit for determining whether the operation of the temperature control unit in accordance with the on / off operation of the temperature control unit.

At this time, the temperature control unit is preferably mounted near the heater of the dryer.

In addition, the safety device is preferably provided with a connection line connecting the temperature control unit and the determination unit.

In addition, the safety device is preferably provided with a display unit for indicating whether the operation is possible.

In addition, the safety device is preferably provided with an operation stop unit for stopping the drying operation of the dryer in conjunction with the determination unit.

In addition, it is preferable that the operation stop unit turns off the heater of the dryer.

In addition, the operation stop unit preferably further turns off the motor of the dryer.

In addition, the safety device is preferably provided with a storage unit for storing the operation or not.

In addition, the determination unit may calculate the cumulative time of the off operation of the temperature controller, and when the cumulative time is more than the reference cumulative time, it is preferable to determine that the temperature controller is inoperable.

In addition, the display unit preferably displays an error message corresponding to the inoperation.

In addition, the safety device of the dryer of the present invention comprises a storage unit for storing information on whether or not the operation of the temperature controller, and a display unit for displaying the information about whether the operation after the power is applied.

In addition, the safety device of the dryer of the present invention, the operation unit for performing the drying operation, the temperature control unit for turning on / off the power supply to the operation unit in accordance with the temperature of the air flow path, and the on / off operation of the temperature control It consists of an operation stop part which stops the said operation part.

In the following, the invention has been described in detail based on the embodiments of the invention and the accompanying drawings. However, the scope of the present invention is not limited by the following embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

Figure 2 is a cross-sectional view of the dryer according to the invention, Figure 3 is an exploded perspective view of the dryer according to the invention, Figure 4 is a partial cutaway view of the dryer according to the invention. The present invention uses the exhaust type dryer as an embodiment, but is not necessarily limited to the exhaust type dryer.

As shown in FIG. 2, the exhaust dryer according to the present exemplary embodiment includes a drum 10 disposed inside the cabinet 1 to accommodate a fabric and a suction flow path 20 installed to suck air into the drum 10. And a heater 30 provided on the suction passage 20 and an exhaust passage 40 installed so that the air passing through the drum 10 is exhausted to the outside of the cabinet 1. In addition, when the exhaust type dryer is installed, an external exhaust duct 50 coupled to the exhaust flow passage 40 and passing through the inner wall 60 of the building and the like to exhaust the air to the outside is installed.

The blower fan 43 is provided on one side of the suction flow path 20 and the exhaust flow path 40, and will be described below in that it is provided in the exhaust flow path 40.

As shown in FIGS. 3 and 4, the cabinet 1 includes a base fan 2, a cabinet main body 3 installed above the base fan 2, and a cabinet cover provided in front of the cabinet main body 3. (4), a back panel (7) provided on the back of the cabinet body (3), a top cover (8) provided on the upper surface of the cabinet body (3), and a control panel (9) provided on the top of the cabinet cover (4). It is configured to include).

As shown in FIG. 3, the cabinet cover 4 is formed with a gun entry hole 5 so that the carriage drum 10 can enter and exit, and a door 6 for opening and closing the gun entry hole 5 is rotated. Possibly connected. In addition, a control panel 9 is installed at the upper end of the cabinet cover 4. The control panel 9 includes an input unit 9a for acquiring a user's input, and a display unit for displaying the state of the dryer (for example, the drying progress state, the drying progress degree, the remaining drying time, the selection of the drying mode, etc.) 9b). Moreover, the front supporter 11 which mounts the back end of the drum 10 rotatably is mounted in the back of the cabinet cover 4.

In front of the back panel 7, a rear supporter 12 is mounted to support the rear end of the drum 10 in a rotatable manner. The rear supporter 12 has a communication hole 13 for communicating the inlet of the suction channel 20 and the drum 10 so that air passing through the suction channel 20 can be sucked into the inlet of the drum 10. do.

3 and 4, the drum 10 is a circular barrel that is accommodated therein and opened in the front-rear direction so that air passes in the front-rear direction, and the rear opening forms the drum inlet, and the front opening is the drum. Form an outlet. The drum 10 is installed so that the lift 14 protrudes from the inner circumferential surface so that the fabric can be lifted and dropped during rotation.

The suction passage 20 is formed by a suction duct installed so that the lower end communicates with the rear end of the heater 30 and the upper end communicates with the communication hole 13 of the rear supporter 12.

3 and 4, the heater 30 is installed on the upper surface of the base fan 2 and arranged in the heater case communicating with the suction flow path 20, that is, the suction duct 20, and inside the heater case. When the power is supplied to the heating coil, the inner space of the heater case and the heater case are heated to heat the air passing through the inside of the heater case with high temperature and low humidity air.

3 and 4, the exhaust flow passage 40 is installed to communicate with the drum outlet so that the air inside the drum 10 can be exhausted, so that foreign matters such as seams in the exhausted air can be filtered out. A lint duct 42 having a lint filter 41 mounted thereon, a fan housing 44 communicating with the lint duct 42 and having a blower fan 43 built therein, and one end communicating with the fan housing 44 and the other end thereof. The other end is made by an exhaust pipe 46 extending out of the cabinet 1. The exhaust pipe 46 is connected to an external exhaust duct 50 for guiding outdoor air exhausted to the outside of the cabinet 1. The external exhaust duct is formed outside the cabinet 1 to direct air to the external space and can pass through the building inner wall 60.

The air flow path used in the present invention includes a suction flow path 20, an internal space of the drum 10, an exhaust flow path 40, and an external exhaust duct 50, and the clogging of the air flow path is the exhaust flow path 40. Mainly occurs in the lint filter 41 and the external exhaust duct 50. The degree of obstruction of air flow due to the blockage of the lint filter 41 of the exhaust passage 40 is relatively smaller than the degree of obstruction of air flow due to the blockage of the external exhaust duct 50.

The operation of the exhaust dryer is an embodiment of the present invention is as follows.

First, after the cloth is introduced into the drum 10, the door 6 is closed, and the control panel 9 is operated to operate the exhaust dryer, and the exhaust dryer turns on the heater 30 and the motor. Drive 72.

When the heater 30 is turned on, the heater 30 heats the inside, and when the motor 72 is driven, the belt 70 and the blowing fan 43 rotate. When the belt 70 rotates, the drum 10 is rotated, and the artillery in the drum 10 is lifted up by the lift 14 and then repeatedly drops.

When the blowing fan 43 is rotated, air outside the cabinet 1 is sucked into the air suction hole 7a of the back cover 7 by the blowing force generated when the blowing fan 43 is rotated, and the cabinet 1 ) And the drum 10. The air between the cabinet 1 and the drum 10 changes into high temperature and low humidity as it enters the heater 30 and is heated, and thereafter, the drum passes through the communication hole 13 of the suction channel 20 and the rear supporter 12. It is sucked into the inside of 10.

When the high temperature and low humidity air sucked into the drum 10 moves toward the front of the drum 10, the high temperature and low humidity air comes into contact with the fabric and changes to high humidity. Then, the air is exhausted to the exhaust flow path 40.

Air exhausted to the exhaust flow passage 40 passes through the exhaust pipe 46 as it is and is exhausted to the outside through the external exhaust duct 50.

5 is a block diagram of a safety device of a dryer according to the present invention. The safety device shown in FIG. 5 receives an external commercial power source to be supplied to the heater 30, but is turned on / off according to the temperature of the heater 30 or the temperature of the air heated by the heater 30. The second thermostat TS1, TS2, a switch SW for applying commercial power to the heater 30 by being turned on / off by a control command of the microcomputer 90, an input unit 9a, and a display unit. Power to the heater 30 in accordance with the on / off of 9b, the heater 30, the blowing fan 43, the motor 72, the first and second thermostats TS1, TS2. The sensing circuit 80 to determine whether or not to supply, and the microcomputer 90 to determine whether the first and second thermostat (TS1), (TS2) can be operated according to the power supply state from the sensing circuit 80 Is done. However, although a power supply unit for supplying a DC power source used for the microcomputer 90, the input unit 9a, the display unit 9b, and the like from a commercial power source is not shown, such a power supply unit is easy for those familiar with the technical field to which the present invention belongs. It is only about.

The first and second thermostats TS1 and TS2 are kinds of temperature controllers, which are mounted on or near the heater 30 to control the temperature of the heater 30 or the air heated by the heater 30. In response to the temperature, the on state is maintained before reaching the predetermined overheating temperature, and when the overheating temperature is exceeded, the state is turned off so that commercial power is not applied to the heater 30. In particular, the first thermostat TS1 does not return to the on state once it is in the off state, as in the prior art. The first and second thermostats TS1 and TS2 are mounted to the suction passage 20 connected to the heater 30, for example.

In addition, the switch SW is configured of an element such as a relay, and maintains an on state during the drying operation according to the on control of the microcomputer 90, and maintains an off state according to the off control of the microcomputer 90.

In addition, the input unit 9a receives a control command related to a drying operation from a user and applies it to the microcomputer 90.

In addition, the display unit 9b may not only input the drying operation input by the user, the progress of the drying operation, and the remaining time, but also whether the first or second thermostat TS1 or TS2 is operable (eg, For example, a text or an error code indicating the inability of the temperature controller to display).

The sensing circuit 80 is connected to the nodes N1 and N2, respectively, to determine whether a current flows through the series circuit including the heater 30, that is, whether power is supplied to the heater 30.

The sensing circuit 80 is connected to the nodes N1 and N2, respectively, to determine whether a current flows through the series circuit including the heater 30, that is, whether power is supplied to the heater 30. For this determination, the sensing circuit 80 is connected to the nodes N1 and N2 by the connecting lines 80a and 80b, respectively. Since the sensing circuit 80 is mounted on the control panel 9 in which the microcomputer 90 is mounted, the connecting lines 80a and 80b are formed in the inner space between the drum 10 and the cabinet body 3 or in the cabinet body 3. Proceed along the inner surface of

More specifically, the sensing circuit 80 is connected to the heater 30 by the on / off operation of the first and second thermostats TS1 and TS2 operating according to the temperature of the heater 30 or air. It is to determine if power is supplied. Of course, the power supply to the heater 30 is also controlled by the switch SW, but since the switch SW is operated by the control of the microcomputer 90, the microcomputer 90 is in the switch SW state. In this case, the power supply state is checked according to the signal from the sensing circuit 80. When the switch SW is turned off by the microcomputer 90, the microcomputer 90 does not consider the signal applied from the sensing circuit 80.

 The sensing circuit 80 applies different signals to the microcomputer 90 according to the power supply state, so that the microcomputer 90 can check the power supply state of the heater 30. Unlike FIG. 5, the input terminal of the sensing circuit 80 may be connected between the first thermostat TS1 and a commercial power supply, and between the heater 30 and the switch SW. In a series circuit composed of the commercial power source, the first and second thermostats TS1 and TS2, the heater 30, and the switch SW, the potential difference across the heater 30 is the most depending on the supply of the commercial power source. As can be clearly identified, the sensing circuit 80 is always connected to sense the potential difference of the portion in which the heater 30 is included.

As described above, the microcomputer 90 basically controls the heater 30, the switch SW, and the motor 72 according to a user's command through the input unit 9a, and the like, and controls the motor 72. The blowing fan 43 is controlled to perform a drying operation.

The microcomputer 90 and the sensing circuit 80 are mounted on the rear of the control panel 9 described above.

In addition, the microcomputer 90 determines information on power supply and shutdown by the first and second thermostats TS1 and TS2 according to the detection signal from the sensing circuit 80. For this determination, the microcomputer 90 calculates and calculates the off time of the first and second thermostats TS1 and TS2 according to the detection signal, and calculates the calculated off time. At least one of the first and second thermostats TS1 and TS2 when the cumulative off time exceeds the reference accumulation time according to the result of the comparison unit 90b and the comparison unit 90b comparing with the reference accumulation time. It is determined that one operation is inoperable, and the switch SW is controlled to cut off the power supply to the heater 30, and the stop unit 90c stops the driving of the motor 72 and the blower fan 43. That is, when the first and second thermostats TS1 and TS2 normally operate, the microcomputer 90 has already stored the reference accumulation time for their off time in the storage unit 90d, and thus accumulated off. The time is less than or equal to these reference cumulative times. When the first and second thermostats TS1 and TS2 operate abnormally, the cumulative off time exceeds the reference accumulation time, so that the power supply to the heater 30 is cut off, and the drying operation is normally performed. The microcomputer 90 may determine this state. This may be a state in which the first thermostat TS1 may be permanently turned off, and thus, power may not be supplied to the heater 30 without replacing the first thermostat TS1.

In addition, the microcomputer 90 displays an inoperable state caused by abnormal states of the first and second thermostats TS1 and TS2 on the display unit 9b. This display portion 9b includes not only visual display but also audio display means (for example, a speaker).

In addition, the microcomputer 90 stores the inoperable states of the first and second thermostats TS1 and TS2 in the storage unit 90d. For example, the storage unit 90d may use an EEPROM. Accordingly, when the dryer is newly supplied with external commercial power, the user may not know the inoperable states of the first and second thermostats TS1 and TS2, and thus is displayed on the display unit 9b. The drying operation is not performed until the inoperable states of the first and second thermostats TS1 and TS2 are resolved.

6 is an embodiment of the sensing circuit of FIG. 5. As shown in FIG. 6, the sensing circuit 80 depressurizes the diode D1 for applying a positive voltage from the input voltage from the node N1 and the input voltage from the node N1. The resistor R1, the noise preventing diode D2 and the capacitor C1 included in the input voltage applied to the input terminals I1 and I2 of the photo coupler PC, and the photo coupler turned on / off according to the input voltage And a different voltage waveform below the reference voltage Vref, which is a DC voltage, to the microcomputer 90 when the photo coupler PC is connected to the output terminal O1 of the photo coupler PC. It consists of a resistor R2 and a capacitor C2. The reference voltage Vref is used as a driving voltage of the microcomputer 90 in the circuit in which the microcomputer 90 is provided, and a description of the voltage supply unit generating the reference voltage Vref is omitted. The generation of Vref) is a technique easily recognized by a person familiar with the technical field to which the present invention belongs.

In particular, since the potential difference between the node N1 and N2 is about 240V when the commercial power source is AC 240V, for example, the resistor R1 is a photocoupler when the voltage is directly applied to the photocoupler PC. This is to reduce the input voltage to several tens of volts since the PC may be damaged.

In addition, the photo coupler PC has a potential difference between the node N1 and N2, that is, when the first and second thermostats TS1 and TS2 are turned on so that power is supplied to the heater 30. Since the voltage corresponding to the potential difference is applied to the input terminal, and this voltage is an AC voltage, the internal photodiode emits light according to the period of this voltage, and the transistor which is the light receiving part is turned on / off, and the square wave is applied to the microcomputer 90. Is approved. If there is no potential difference between the nodes N1 and N2, that is, when the first or second thermostat TS1, TS2 is turned off so that power is not supplied to the heater 30, the input terminal of the sensing circuit 80 is turned off. Since the inside of the photodiode does not emit light, the transistor which is the light receiving part is turned off, and thus the DC voltage waveform close to the reference voltage Vref is continuously applied to the microcomputer 90.

7 and 8 are graphs of output waveforms of the sensing circuit. As shown in FIG. 7, when the first and second thermostats TS1 and TS2 are in an on state, commercial power, which is AC, is applied to the heater 30, so that the nodes N1 and N2 are connected to each other. A voltage difference of a magnitude corresponding to this commercial power source is caused, and the photo coupler PC is turned on according to the voltage difference, but since the AC voltage is applied, the photo coupler PC is repeatedly turned on and off in response to the cycle of the commercial power source. The square wave smaller than the reference voltage Vref is applied to the microcomputer 90.

As shown in FIG. 8, when the first or second thermostats TS1 and TS2 are in an off state, power is not supplied to the heater 30, and the nodes N1 and N2 are coincided with each other. The photo coupler PC is always turned off, so that a DC voltage (for example, a high signal) close to the reference voltage Vref is applied to the microcomputer 90.

Accordingly, the microcomputer 90 may calculate the power cutoff time to the heater 30 due to the OFF state of the first and second thermostats TS1 and TS2 according to the waveform of the DC voltage applied thereto.

9 is an on / off graph recognized by the microcomputer. As shown in FIG. 9, the microcomputer 90 recognizes information about supply and interruption of power by the first and second thermostats TS1 and TS2 according to the signals according to FIGS. 7 and 8. . Accordingly, the microcomputer 90 may accumulate the off times of the first and second thermostats TS1 and TS2. For example, the cumulative sum of the off-times (t1 to t7) is calculated to calculate the cumulative off-time.

10 is a driving flowchart of the safety device of the dryer according to the present invention. In the following, the first thermostat TS1 and the second thermostat TS2 are collectively referred to as a temperature controller. The driving flowchart of FIG. 10 senses an operation state of the temperature controller while the dryer performs a drying operation.

In detail, in step S51, the microcomputer 90 applies an ON command to the switch SW to operate the heater 30, and causes the motor 72 and the blower fan 43 to drive to perform the drying operation. To start.

In operation 52, the operation unit 90a of the microcomputer 90 checks the on / off state of the temperature controller according to the detection signal received from the detection circuit 80, and accumulates the off time. As the drying operation proceeds, the temperature controller repeatedly adjusts the temperature by repeating the on / off state as described above.

In step S53, the comparing unit 90b of the microcomputer 90 compares the reference off time previously stored in the storage unit 90d with the cumulative off time, and if the cumulative off time is greater than the reference off time, the control unit 90b proceeds to step S56. Otherwise, the flow advances to step S54. This reference off time may be set to 400 seconds, for example. This reference off time may be variablely set depending on the amount of cloth fed into the dryer.

In step S54, the microcomputer 90 determines whether the drying operation currently in progress is completed, and if the drying operation is completed, proceeds to step S55, otherwise proceeds to step S52 to continue the drying operation. do.

In step S55, since the microcomputer 90 is in a normal state in which the temperature controller is operable, the microcomputer 90 stores the operable state of the temperature controller in the storage unit 90d.

In step S56, the stopper 90c of the microcomputer 90 applies an OFF command to the switch SW according to the result of the comparator 90b so that the heat generation by the heater 30 is preferentially stopped. Then, the driving operation is stopped by stopping the driving of the motor 72. This is because if the drying operation is continued in the inoperable state of the temperature control unit, unexpected damages such as a fire problem in the dryer and damage to clothes may be caused.

In step S57, the microcomputer 90 stores in the storage unit 90d that the temperature control unit is in an inoperable state, and displays a text or an error code (e.g., ' TSE '(thermostat error)).

By the above-described step S57, the microcomputer 90 stores the temperature control unit in an inoperable state in the storage unit 90d, so that after the user turns off the dryer, even if the power is supplied again, the storage unit The inoperable state of the temperature controller stored in 90d can be displayed.

Through the indication of the inoperable state of the temperature control unit, the user can recognize the failure of the temperature control unit of the dryer, and can take appropriate measures for repair thereof.

The present invention has the effect of determining the failure of the thermostat to notify the user to use the dryer safely.

In addition, the present invention has the effect of preventing the unexpected damage by solving the problem of overheating, such as a heater by stopping the drying operation according to the failure of the thermostat.

In addition, the present invention has the effect of continuously displaying the failure of the thermostat so that the user can take action or repair for it.

Claims (18)

A temperature controller which is turned on / off in accordance with the temperature of the air passage; Safety device of the dryer, characterized in that consisting of a determination unit for determining whether the operation of the temperature control unit according to the on / off operation of the temperature control unit. The method of claim 1, The temperature controller is a safety device of the dryer, characterized in that mounted to the heater of the dryer. The method of claim 1, The safety device is a safety device of the dryer, characterized in that it comprises a connection line connecting the temperature control unit and the determination unit. The method of claim 1, The safety device is a safety device of the dryer, characterized in that it comprises a display unit for displaying whether or not the operation. The method of claim 1, The safety device of the dryer, characterized in that it comprises an operation stop unit for stopping the drying operation of the dryer in conjunction with the determination unit. The method of claim 5, And the operation stopper turns off the heater of the dryer. The method of claim 6, And the operation stopper further turns off the motor of the dryer. The method of claim 1, The safety device is a safety device of the dryer, characterized in that it comprises a storage for storing the operation. The method according to any one of claims 1 to 8, And the determination unit calculates a cumulative time of the off operation of the temperature controller, and determines that the temperature controller is inoperable when the cumulative time is equal to or greater than a reference cumulative time. The method of claim 9, The display unit is a safety device of the dryer, characterized in that for displaying an error message corresponding to the inoperable. A storage unit which stores information on whether the temperature controller is operable; The safety device of the dryer, characterized in that consisting of a display unit for displaying information on whether the operation is possible after the power is applied. The method of claim 11, Safety information of the dryer, characterized in that the information on whether the operation includes the inoperable state of the temperature controller. The method according to claim 11 or 12, wherein And the display unit displays the information as an error message. An operating unit for performing a drying operation; A temperature control unit for turning on / off a power supply to the operation unit according to the temperature of an air flow path; Safety device of the dryer, characterized in that consisting of an operation stop unit for stopping the operation unit in accordance with the on / off operation of the temperature control unit. The method of claim 14, The safety device is a safety device of the dryer, characterized in that it comprises a display unit for displaying the operation stop state of the operation unit in conjunction with the operation stop unit. The method of claim 14, And the operation stopper sequentially turns off the heater and the motor of the operation unit. The method according to any one of claims 14 to 16, The operation stop unit may be configured to calculate a cumulative off time of the temperature controller, a comparator to compare the cumulative off time with a reference off time, and when the cumulative off time is greater than a reference off time, the temperature controller may be inoperable. The safety device of the dryer, characterized in that consisting of a stop for stopping the operation of the operating unit judged to be. The method of claim 17, And the display unit displays an inoperable state of the temperature control unit as an error message.

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