KR100751131B1 - Method for sensing belt-cutoff of dryer - Google Patents

Abstract

A method for sensing belt-cutoff of a dryer is provided to reduce unnecessary power consumption by suspending operations of a motor and a heater when a belt of a drum is cut off. A method for sensing belt-cutoff of a dryer includes the steps of: detecting an 'on'-state of a sensor in real time for determining whether a belt-cutoff signal is generated during a dry process(S130); suspending a heater and a motor simultaneously when a controller receives an 'on' signal of the detector(S140); repeating positive rotations and reverse rotations of the motor in a preset time from a point in which the motor is suspended(S150,S160); detecting the 'on'-state of the sensor again(S170); determining that the belt is cut off if the detector is turned on, and displaying a signal indicating that the belt is cut off(S180); and completing the dry process according to an input dry condition if the 'on' signal of the detector is not received by the controller(S190).

Description

Method for detecting belt break in dryer {Method for sensing belt-cutoff of dryer}

1 is a cross-sectional view of the dryer provided with a belt break detection structure according to the spirit of the present invention.

Figure 2 is a perspective view showing the internal structure of the dryer.

Figure 3 is an external perspective view of a motor mounted to the dryer according to the spirit of the present invention.

Figure 4 is a front view of the rear bracket constituting the motor.

5 is a side view showing a motor state in a normal state.

6 is a side view showing a motor state in a state where a belt break occurs.

7 is a shape of the heat dissipation unit for preventing the interference between the base and the pressing portion of the motor.

8 is a view for explaining the distribution of the force acting on the motor part in the dryer according to the idea of the present invention.

9 is a block diagram showing a system configuration for implementing a belt break detection control method of a dryer according to the spirit of the present invention.

10 is a flowchart for explaining a belt break detection control method for a dryer according to an embodiment of the present invention.

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

10 dryer 11 cabinet

12: drying drum 13: door

14 heater 15 circulation passage

16 cooling fan 17 belt

18: drying fan 30: motor

31: motor shaft 37: pressurizing portion

40: spring 50: micro switch

The present invention relates to a dryer, and more particularly, to a drum belt break detection method of a dryer for immediately detecting a break of a belt driving a drying drum to prevent idling of a motor and preventing overheating by a heater.

In general, in the drum dryer, when the drying drum rotates, the laundry contained in the drying drum rotates together, and the laundry rises and falls by the rotation. Then, the hot dry air flowing into the drying drum is mixed with the laundry to evaporate the moisture permeating the laundry, thereby allowing the laundry inside the drying drum to dry. In addition, the dryer air is introduced into the drum again through the condenser and the heater, the air inside the drum is condensation type dryer circulating in the dryer without being discharged to the outside, and the air inside the drum passes through the condenser It is roughly classified as an exhaust dryer that removes moisture and then discharges it to the outside.

In detail, in the case of the condensation type dryer, the circulating air circulating in the dryer absorbs moisture permeating the laundry inside the drum, and then the temperature is lowered by heat exchange while passing through the condenser. As the temperature decreases, moisture contained therein condenses. The condensed water condensed is pumped by a condensation pump and finally discharged to the outside.

On the other hand, the exhaust dryer takes a manner in which air in a high temperature and high humidity state in which the laundry absorbs moisture in the drum is discharged to the outside of the dryer through a lint filter.

However, the condensation-type and exhaust-type dryers are the same in that the laundry contained in the drum is repeatedly heated and dropped by the rotation of the drum, while actively exchanging heat with the hot dry air inside the drum.

On the other hand, in the conventional drum dryer, a drum belt is wound around the outer circumferential surface of the drum, and the drum belt is wound around the motor shaft so that the drying drum is rotated by the rotational force of the motor.

However, since the conventional drum dryer does not have a structure capable of detecting the breakage of the drum belt, the motor and the heater continue to operate even after the drum belt is broken. That is, as the fan connected to the motor continues to rotate, heat is continuously generated in the heater. As a result, since the hot air continues to be supplied while the drum is not rotating, there is a problem that the laundry is locally overheated and exposed to the risk of fire. In addition, the clothing to be dried has a disadvantage in that the drying efficiency is reduced since only the part which contacts the hot air supplied is dried and the remaining part remains wet.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a detection method for quickly detecting the breakage of the drum belt during the drying process.

In detail, when the drum belt break occurs during the drying process, the operation of the motor and the heater is stopped quickly, and a belt break detection method that prevents a part of the fabric contained inside the drum from being overheated and ignited in advance. The purpose is to provide.

In addition, it is an object of the present invention to provide a belt break detection method to reduce unnecessary power consumption by stopping the operation of the motor and the heater at the same time as the belt is broken.

Belt disconnection detection method of the dryer according to the present invention for achieving the object as described above is the step of operating the drying drum is input; The sensor is turned on due to the belt disconnection; and the driving of the heater and the motor is stopped at the moment the sensor is turned on.

In another aspect, the belt breaking detection method of the dryer according to the present invention is characterized in that, when a belt break occurs, the motor itself rotates to determine whether the belt breaks by pressing the belt break detection unit.

By the above configuration, the drum belt is cut off and at the same time the operation of the motor and the heater is stopped, thereby securing the stability and reducing the power consumption.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other embodiments included in the scope of the present invention and other degenerate inventions can be easily added by adding, changing, or deleting other elements. I can suggest.

1 is a cross-sectional view of a dryer provided with a belt break detection structure according to the spirit of the present invention, Figure 2 is a perspective view showing the internal structure of the dryer.

1 and 2, a dryer 10 having a belt break detection structure according to the present invention includes a cabinet 11 forming an outer shape and a drying drum provided inside the cabinet 11 and containing laundry. (12), a front frame (20) mounted at the front of the cabinet (11), and a front cover (21) attached to the rear surface of the front frame (20) to support the front opening of the drying drum (12). And a control panel 22 seated on an upper side of the front frame 20 to allow input of drying conditions, a base 23 provided below the drying drum 12, and the front frame 20. The door 13 is rotatably mounted on the front of the motor, and the motor 30 is seated on the upper side of the base 23 to generate a rotational force.

In detail, a door lint filter 131 for filtering lint is provided in the door 13, and a circulation passage 15 is provided directly below the door 13. In addition, a body lint filter 151 for filtering lint is provided at the inlet side of the circulation channel 15. The base 23 is provided with a cooling fan 16 for sucking external air and a drying fan 18 for sucking circulating air discharged to the front of the drying drum 12. Here, the cooling fan 16 and the drying fan 18 are connected in a direction opposite to the motor shaft 31 of the motor 30, respectively. The belt 17 is wound around the outer circumferential surface of the drum 12, and the belt 17 is wound around the motor shaft 31. Therefore, the drying drum 12 rotates while the belt 17 rotates in accordance with the rotation of the motor shaft 31.

In addition, a drying duct 19 is provided on the outside of the cabinet 11, ie on the back of the dryer 10. In detail, the drying fan 18 is accommodated in the lower side of the drying duct 19, and an upper end of the drying duct 19 is connected to the rear of the drying drum 12. In addition, the drying duct 19 is provided with a heater 14 for generating high temperature heat to heat the circulating air. The rear of the drying drum 12 is connected to and supported by the cabinet 11 by the drum shaft 121.

In addition, the cooling fan 16 is seated in the base 23, and the base 23 is provided with a circulating air flow path and a cooling flow path. The condenser is provided at the point where the circulation air flow path and the cooling flow path intersect.

In addition, a heat dissipation unit 231 in which repair holes are arranged is formed at a portion where the motor 30 is seated, so that heat generated from the motor is quickly released. In addition, the motor 30 is connected to the base 23 by a spring 40, and one side of the base 23 is provided with a micro switch 50 for detecting the disconnection of the belt 17. . Here, the belt 17 is connected to the motor shaft 31, the moment to rotate the motor 30 in the direction of the drying drum 12 is generated. The spring 40 is connected to offset this and to prevent the motor 30 itself from rotating by the moment. This will be described in more detail later with reference to the drawings.

The operation of the condensation type dryer 10 constituting the above configuration will be described.

First, when a drying object is put into the drying drum 12 and an operation command is input, the motor 30 and the heater 14 operate. Then, the air is circulated into the drying drum 12 while the drying fan 18 connected to the motor 30 is driven. Then, the belt 17 connected to the motor shaft 31 rotates to rotate the drying drum 12. As the cooling fan 16 rotates, indoor air flows through the cooling flow path formed inside the base. The circulating air flowing along the circulating air flow path and the indoor air sucked through the cooling flow path do not mix with each other while passing through the condenser. After the heat exchange is performed, the circulating air is introduced into the drying duct 19, heated by the heater 14 in the drying duct 19, and then introduced into the drying drum 12 again. Then, the indoor air heat exchange is discharged back to the room.

At this time, when the belt 17 is broken due to age, the motor 30 is pressed by the micro switch 50 while rotating by the elastic force of the spring (40). Here, a structure for pressing the micro switch 50 is formed on the outer circumferential surface of the motor 30. Hereinafter, a structure for detecting the case where the belt 17 is broken will be described in more detail with reference to the accompanying drawings.

Figure 3 is an external perspective view of a motor mounted to the dryer according to the spirit of the present invention, Figure 4 is a front view of the rear bracket constituting the motor.

Referring to FIG. 3, the motor 30 of the dryer according to the present invention includes a motor bracket 34, a stator 32, a rotor (not shown) provided inside the stator 32 to rotate, and A motor shaft 31 connected to the rotor to rotate and a pulley 33 extending to the outer circumferential surface of the motor bracket 34 to which the belt 17 is connected are included.

In detail, the motor bracket 34 includes a front bracket 35 having a spring catching hole 351 to which one end of the pulley 33 and the spring 40 are connected, and a pressure for pressing the micro switch 50. It consists of a rear bracket (36) provided with a portion (37). In addition, one side of the belt 17 is in close contact with the pulley 33, and an opposite side of the surface in close contact with the drying drum 12 is in close contact with the pulley 33. The portion wound around the motor shaft 31 becomes the same surface as the surface in close contact with the drying drum 12. That is, the belt 17 connected to the pulley 33 and the motor shaft 31 is wound in a substantially "S" shape.

Referring to FIG. 4, a motor shaft through hole 361 through which the motor shaft 31 penetrates is formed at the center of the rear bracket 36, and the pressing unit 37 is formed at an outer circumferential surface thereof.

In detail, the pressing portion 37 is formed to protrude from the edge of the rear bracket 36. By this structure, when the belt 17 is broken, the motor 30 itself rotates around the motor shaft 31. In addition, the pressing unit 37 presses the micro switch 50 while the motor 30 rotates. Here, the driving force of the rotation of the motor 30 at the moment when the belt 17 is broken is a moment generated by the elastic force to return the spring 40 to its original position.

In more detail, the pressing unit 37 may include a first curved portion 371 that is curved at a predetermined curvature, a second curved portion 373 that is curved at a predetermined curvature at an end of the first curved portion 372, and the first curved portion 371. It consists of the tip part 372 which is the point which switches from 1st curved part 371 to the 2nd curved part 373, ie, the highest point of the said press part 37. As shown in FIG.

Here, the curvature of the first curved portion 371 is greater than that of the second curved portion 373. That is, the inclination of the first curved portion 371 is gently curved, and the inclination of the second curved portion 373 is more sharply curved than that of the first curved portion 371.

The first curved portion 371 is gently curved to prevent the micro switch 50 from being pressed by the pressing portion 37 in a normal state in which the belt 17 is not broken. That is, in the drying process, the motor 30 may be eccentric due to vibration or vibration generated in the rotation process of the belt 17. In addition, the motor 30 itself may rotate by a predetermined angle due to the vibration and the eccentricity. In this situation, the first curved portion 371 is gently inclined to prevent the pressing portion 37 from pressing the micro switch 50. That is, despite being in a normal state, it is prevented from being erroneously detected by a broken belt.

In addition, the second curved portion 373 that is curved at a predetermined curvature at the point where the first curved portion 371 ends is formed to prevent breakage of the micro switch 50.

In detail, as shown in FIG. 7, when the motor 30 is seated on the base by the assembler, the pressing part 37 may be positioned below the micro switch 50. In this case, the assembler rotates the motor to correct the position of the motor 30. The micro switch may be damaged by being caught by the pressing part 37 while the motor 30 is rotating. In order to prevent such a problem, by allowing the second curved portion 373 to be bent at a predetermined curvature, it is possible to prevent the micro switch 50 from being damaged when the motor is incorrectly assembled.

In addition, the tip portion 372 should be located at the point where the micro switch 50 is pressed when a rotation moment is generated in the motor 30 due to the elasticity of the spring 40 due to the belt breaking. In detail, the formation position of the tip portion 372 is determined according to the amount of rotation of the motor 30 that is rotated by the linear distance from the extended state of the spring 40 to the original state. In other words, it is preferable that the amount of rotation be approximately equal to the length of the arc from the micro switch to the tip portion 372. This will be described in more detail with reference to the accompanying drawings.

FIG. 5 is a side view showing a motor state in a normal state, and FIG. 6 is a side view showing a motor state in a state where a belt break occurs.

Referring to FIG. 5, in a state where the belt 17 connected to the motor shaft 31 is not broken, the pressing unit 37 of the motor 30 is pulled by the force of the belt 17. ) Will be located above.

Here, a contact protrusion 52 protrudes from an upper surface of the micro switch 50, and a contact bar 51 extends above the contact protrusion 52. In addition, in the normal state, the contact bar 51 is maintained in a state spaced apart from the contact protrusion 52.

Referring to FIG. 6, when the belt 17 is broken, the motor 30 is rotated counterclockwise in the state shown by the return force of the spring 40. In addition, the pressing part 37 also rotates in a counterclockwise direction to contact the contact bar 51 in the order of the first curved part 371-> tip 371. In addition, the contact bar 51 is pressed by the pressing unit 37, thereby contacting the contact bar 51 and the contact protrusion 52. The micro switch 50 is turned on to generate a pulse when the contact bar 51 contacts the contact protrusion 52. The pulse signal is transmitted to the controller, and the controller recognizes that the belt is broken.

7 is a view showing the shape of the heat dissipation unit for preventing the interference between the pressing portion of the base and the motor.

Referring to FIG. 7, the pressing part 37 forms a shape protruding more than the circumference of the rear bracket 36. Therefore, when the heat dissipation part 231 of the base 23 is in a flat state, there is a possibility that the pressing part 37 rotates and interferes with the heat dissipation part 231.

In order to eliminate this possibility, the heat dissipation part 231 has a shape recessed to a predetermined depth. In detail, the heat dissipation part 231 is preferably curved with the same curvature or more than the circle drawn in the process of rotating the tip portion 372 of the pressing unit 37.

In more detail, when the belt 17 is broken in the process of rotating the drying drum 12, when the motor 30 is rotated by the return elastic force of the spring 40, the weight of the motor 30 Due to the inertial force by the pressing portion 37 may occur more than the rotation of the micro switch 50 point. Alternatively, the pressing part may be located under the micro switch 50 due to the misassembly of the assembler. In this possible situation, the heat radiating portion 231 is bent downward a predetermined depth in order to prevent interference between the pressing portion 37 and the heat radiating portion 231.

8 is a view for explaining the distribution of the force acting on the motor part in the dryer according to the idea of the present invention.

Referring to FIG. 8, the belt 17 forms a shape in which the belt 17 is wound around the motor shaft 31 after being in contact with the outer circumferential surface of the pulley 33.

In detail, since the belt 17 is wound tightly on the drying drum 12, the tension of the belt 17 acts on the pulley 33. That is, the force (F1) for pressing the pulley 33 acts.

On the other hand, the spring 40 is an elastic body having a predetermined modulus of elasticity, it is maintained in an extended state when connected to the motor. Therefore, an elastic force (F2) to return to the original state is applied to the spring 40.

When viewed from the center of the motor, by the force (F1) acting on the pulley generates a rotation moment M1 to rotate in the counterclockwise direction, the magnitude of the rotation moment (M1) It becomes F1 * R1 (the radius of the motor).

In addition, by the elastic force (F2) of the spring 40 is generated a rotation moment (M2) to rotate in the clockwise direction to the motor 30, the size of the rotation moment (M2) is F2 * R2 (motor Distance from the center of the spring hanger). Then, the two rotation moments are the same size, and the motor is stopped.

Here, when the belt 17 is broken, the rotation moment M1 acting on the pulley is lost, and the motor 30 is in the state shown by the moment M2 generated by the spring 40. It will rotate clockwise. Therefore, the pressing part 37 also rotates and presses the contact bar 51 of the micro switch 50.

On the other hand, the rotation amount θ of the motor 30 is an angle corresponding to the straight line length B reduced from the length A in which the spring 40 is extended to the length C in the original position.

That is, L = R2 * θ.

In addition, the position where the tip portion 373 is formed is the micro switch 50 when the motor rotates by the rotation amount θ from the position of the motor 30 in a state where the belt 17 is not broken. It is preferable that it is formed in the point which can pressurize.

9 is a block diagram showing a system configuration for implementing a belt break detection control method of a dryer according to the spirit of the present invention.

9, a system of a dryer for implementing a belt break detection control method according to the present invention includes a control unit 400, a key input unit 410 for inputting a drying condition and an operation command, and an input drying condition. Accordingly, the driving unit 440 for driving the motor and the heater, the sensing unit 430 for detecting the break of the belt, and the memory 420 in which various data are stored are included.

In detail, the sensing unit 430 corresponds to the micro switch 50 mentioned above.

By the above configuration, when the belt 17 is broken and the motor 30 rotates, the sensing unit 430 detects this, and the detected signal is transmitted to the control unit 400. In addition, the control unit 400 determines the signal and transmits a control signal to stop the operation of the driving unit 440 to stop the operation of the motor and the heater.

Hereinafter, a belt break detection control method according to the present invention will be described in more detail with a flowchart.

10 is a flowchart for explaining a belt break detection control method for a dryer according to an embodiment of the present invention.

Referring to FIG. 10, first, a user inputs a drying condition and inputs an operation command using an operation button (S110). Then, the motor is driven and the drying drum is rotated according to the input drying condition and the operation command (S120).

In addition, the controller 400 determines whether a belt break signal is generated during the drying process. In other words, it is determined in real time whether the sensing unit is turned on (S130). Here, the detection unit being turned on means that the pressing unit 37 presses the micro switch 50 to generate an electric signal.

On the other hand, if the sensing unit ON signal is not received by the control unit is a drying process according to the input drying conditions (S190). Then, it is determined whether the drying is completed (S200), and when the drying is completed, the dryer operation is stopped to terminate the drying process. If it is determined that the drying is not completed, the drying drum is continuously rotated (S120), and the process of determining whether the sensing unit is turned on by the controller (S130) is repeatedly performed.

However, when the control unit receives the detection unit on signal, the heater and the motor stop at the same time (S140). If the motor and the heater continue to be driven even though the belt break signal is received, the risk of fire due to the overheating of the heater and the overheating of the drying drum is caused.

In addition, when the motor and the heater are stopped and the set time elapses (S150), the forward and reverse rotation of the motor is repeatedly performed for the set number of times or the set time (S160). Then, it is again detected whether the detection unit is on (S170). This is because the detection unit on-signal may be generated due to electrical noise even though the belt is not broken. That is, when the detection unit ON signal is generated, once the driving of the motor and the heater is stopped, and the detection unit ON signal is re-checked whether the detection unit ON signal is due to the belt break or the electrical noise through the reversing of the motor.

On the other hand, if it is determined that the detection unit is on, it is determined that the belt is broken, so that the belt break signal is displayed on the display unit (S180). As a method of displaying the belt disconnection signal, voice, text, and lights may be used. If it is determined that the detection unit is not turned on, it is determined that it is due to electric noise, so that normal drying processes S190 to S200 are performed.

By the control method as described above, it is possible not only to quickly detect the breakage of the belt winding the drying drum 12, but also to quickly detect whether the belt is due to true belt breakage. In addition, by stopping the belt and stopping the operation of the driving unit, there is an advantage that the power consumption is reduced and the stability of the product is secured.

By the belt break detection structure of the dryer according to the present invention constituting the configuration as described above, there is an effect that the operation of the motor and the heater is stopped by detecting at the same time the drum belt is broken during the drying process.

In detail, the drum belt is broken and at the same time the operation of the motor and the heater is stopped, thereby reducing the unnecessary power consumption.

In addition, since the operation of the motor and the heater is stopped at the same time as the drum belt is broken, there is an effect of preventing the risk of a fire being caused by a part of the fabric being overheated by hot air supplied into the drum.

Claims (11)

Inputting an operation command to rotate the drying drum; The sensing unit is turned on due to the belt breaking; and And stopping the driving of the heater and the motor as soon as the detection unit is turned on. The method of claim 1, When the belt break occurs, the motor is rotated by the rotational moment to detect the belt break of the dryer, characterized in that for pressing the detection unit. The method of claim 1, After the set time has elapsed since the driving of the heater and the motor are stopped, the forward and reverse rotation of the motor is repeatedly performed for a predetermined number or a predetermined time; And determining again whether the detector is on.  The method of claim 3, wherein In the step of determining again whether the detection unit is on, if it is determined that the detection unit is on, the belt break detection method of the dryer, characterized in that the signal indicating that the belt is broken through the display unit. The method of claim 4, wherein The belt disconnection signal detecting method of the belt breakage of the dryer, characterized in that at least one of voice, text or light can be selected. The method of claim 3, wherein In the step of determining again whether the detection unit is on, if it is determined that the detection unit is off, the belt breaking detection method of the dryer, characterized in that the normal drying process is performed. When the belt break occurs, the belt break detection method of the dryer, characterized in that for determining whether the belt breaks by pressing the belt break detection unit by rotating the motor itself. The method of claim 7, wherein One side of the outer peripheral surface of the motor belt disconnection detection method of the dryer, characterized in that the pressing portion for pressing the belt disconnection detection unit is provided. The method of claim 7, wherein And after the belt break detection unit is turned on to determine that the belt break is on, the belt break detection unit is further determined to determine whether the belt break detection unit is still on. The method of claim 9, The method of detecting a belt break of the dryer, wherein the forward and reverse rotation of the motor is repeatedly performed for a set number of times or a set time before the belt breakage detecting unit is judged again. The method of claim 9, In the step of judging whether the belt break detection unit is continuously on, if it is determined that the belt break detection unit is not on, the normal drying process is performed again. Belt disconnection detection method of the dryer, characterized in that displayed to the outside.

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