JP2008099853A - Clothes dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce uneven drying caused by a bunch of entangled clothes in a drum during drying operation. <P>SOLUTION: After starting drying operation, an increase ΔT in temperature of a drum outlet is evaluated every minute during drying operation (S10, S11). Bunching clothes in the drum causes an insufficient heat exchange between clothes and heated air, and the heated air passes through the drum, so that the temperature at the drum outlet is suddenly increased. Accordingly, the bunch of the clothes is determined by an increase ΔT of ≥3°C (Y in S12), and the rotation speed of the drum is changed stepwise (S13-S15). Therefore, the agitation state of the clothes in the drum is changed, and loosening of the bunching clothes is promoted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drum-type clothes dryer for drying washed clothes.

  2. Description of the Related Art A drum-type clothes dryer that dries clothes by rotating a drum containing clothes to be dried at a relatively low speed and feeding heated air into the drum is known (for example, Patent Documents). 1 etc.). In such conventional clothes dryers, in order to reduce tangling of clothes, the drum repeats left-right reversal, for example, right rotation → pause → left rotation → pause, and the rotation speed during rotation drive is almost constant. Control that is maintained is performed.

  However, particularly when the amount of clothing contained in the drum is large, once the clothing is intertwined into a dumpling-like mass, there is a problem that the clothing is difficult to loosen by conventional rotation control. When clothes are dumped in the drum, the area near the outer surface is exposed to heated air and drying progresses, but the clothes located on the inner side do not reach the clothes and are not easily dried. As a result, uneven drying tends to occur and there is a garment that is insufficiently dried, but there is also a risk of fabric damage due to excessive drying. Moreover, since the area of heat exchange between clothing and heated air is reduced, the drying efficiency is also reduced overall.

  In addition, when the drum reversal control is performed as described above, the rotation of the drum is always temporarily stopped, but when such a drum is stopped, clothing gathers at the bottom of the drum, so that heated air enters the drum. Hard to enter. Therefore, a large amount of heated air flows through the gap between the drum outer peripheral surface and the drying chamber (outer tub), and heat exchange between clothing and heated air is not performed very well in the drum. That is, the drum reversal control has a certain effect in preventing tangling of clothes, but it may not be preferable from the viewpoint of drying efficiency, and this is one of the factors that lengthen the drying time.

JP 2002-35491 A

  The present invention has been made to solve the above problems, and a first object of the present invention is to provide clothing that can reduce drying unevenness and increase drying efficiency even when the amount of clothing is large. It is to provide a dryer. Further, the second object of the present invention is to provide a clothes dryer capable of improving the drying efficiency and shortening the drying time especially when the amount of clothes is relatively small while suppressing the tangling of clothes as much as possible. It is to provide.

According to a first aspect of the present invention, there is provided a drum which is disposed in a drying chamber and accommodates clothes to be dried therein, a rotation driving means for rotating the drum, and the drying chamber. In a clothes dryer comprising heated air supply means for supplying heated air to an air passage including
Temperature detecting means for detecting the temperature of the air that has passed through the drying chamber;
A control means for obtaining a temperature rise width within a predetermined time by the temperature detection means during a drying operation, and controlling the rotation driving means to change the rotation speed of the drum based on the temperature rise width;
It is characterized by having.

A second invention made to achieve the first object is a rotational drive including a drum disposed in a drying chamber and containing clothes to be dried inside, and a motor for rotationally driving the drum. A clothes dryer comprising: means; and heated air supply means for supplying heated air to an air passage including the drying chamber;
Temperature detecting means for detecting a current supplied to the motor;
A control means for obtaining an index value reflecting the magnitude of the motor current within a predetermined time by the current detection means during the drying operation, and for controlling the rotation driving means to change the rotational speed of the drum based on the index value;
It is characterized by having.

Further, the third invention made to achieve the second object is to provide a drum which is disposed in a drying chamber and accommodates clothes to be dried inside, a rotation driving means for rotating the drum, and the drying In a clothes dryer comprising heated air supply means for supplying heated air to an air passage including a chamber,
Temperature detecting means for detecting the temperature of the air that has passed through the drying chamber;
In the initial stage of the drying operation, the temperature detection means determines the temperature increase degree. When the temperature increase degree is relatively large, the drum is rotated in one direction. When the temperature increase degree is relatively small, Control means for controlling the rotation driving means so as to rotate the drum in both left and right directions;
It is characterized by having.

  When the drying operation is started, the drum is rotationally driven at a predetermined rotational speed, and heated air begins to be supplied into the drying chamber, heat exchange is performed between the heated air that has entered the drum and the wet clothing. At this time, if the clothes are scattered in the drum, the heat air easily passes between the clothes and between the fibers of the clothes, so that heat exchange is performed well, thereby the temperature of the air passing through the drum. Is relatively low. On the other hand, if clothing is in a tangled state in the drum, the chance of heat exchange between the clothing and the heated air is reduced, and the amount of heat taken away from the heated air is reduced. Get higher. Similarly, when the clothing is stuck to the inner peripheral surface of the drum by the action of moisture contained in the clothing and closes the vent hole, the temperature of the air that has passed through the drum becomes high.

  Therefore, in the clothes dryer according to the first invention, the control means obtains the temperature rise width of the air on the drum outlet side within a predetermined time based on the temperature detected by the temperature detection means, and when this temperature rise width is large, It is determined that the clothes are being gathered together in a dumpling shape or the clothes are stuck to the inner peripheral surface of the drum. In that case, the rotation driving means is controlled so as to increase the rotation speed of the drum, for example. Then, the agitation state of the clothes in the drum changes, and it is possible to promote the loosening of the clothes that have been entangled or to promote the loosening of the clothes that have gathered together. In addition, when clothing is attached to the inner peripheral surface of the drum, peeling can be promoted.

  Thus, according to the clothes dryer which concerns on 1st invention, when clothing is entangled in the drum in connection with execution of drying operation, and when clothing is sticking to the drum inner peripheral surface Such a situation can be quickly resolved, and the heated air can easily pass between clothing or between the fibers of clothing. Thereby, unevenness in drying can be reduced, overall drying efficiency can be improved, and sufficient drying performance can be obtained in a shorter time.

  Also, as described above, if clothes are getting tangled in the drum and becoming clumped, or if clothes are stuck to the inner peripheral surface of the drum, the rotational load of the drum increases, so a motor is used to maintain the same rotational speed. Therefore, it is necessary to pass a larger current. Therefore, in the clothes dryer according to the second aspect of the invention, the current value of the current supplied to the motor is used instead of using the temperature of the air that has passed through the drying chamber. However, since the motor current changes from moment to moment, for example, an average value or an integrated value of motor current values within a predetermined time may be used as the index value.

  In the clothes dryer according to the second invention as well as the first invention, the rotation speed of the drum is changed to quickly eliminate clumps caused by tangling of clothes in the drum and sticking of clothes to the inner peripheral surface of the drum. can do. Thereby, unevenness in drying can be reduced, overall drying efficiency can be improved, and sufficient drying performance can be obtained in a shorter time.

  In addition, when the amount of clothing stored in the drum is small, that is, when the load amount is small, the amount of heat taken away by heat exchange between the heated air and the clothing in the drum is relatively small, so the load amount is large. Compared to the case, the temperature rise degree of the air on the outlet side of the drying chamber at the initial stage of the drying operation is increased. That is, the magnitude of the load amount in the drum can be estimated by determining the temperature rise degree of the air that has passed through the drying chamber in the initial stage of drying.

  In the clothes dryer according to the third aspect of the invention, when the degree of temperature rise is relatively large, that is, when it can be estimated that the load amount is small, the drying operation is performed while rotating the drum in one direction. If the drum is continuously rotated in one direction without reversal control, the garment is generally easily entangled. However, the entanglement of the garment is not a problem when the load is originally small. Since the drum continues to rotate (there is no temporary stop during reversal control), the heated air is always sent into the drum satisfactorily, so that drying can be performed efficiently. On the other hand, when the temperature increase degree is relatively small, that is, when it can be estimated that the load amount is large, the drying operation is performed while the drum is reversely controlled. Thereby, the tangle of clothing can be suppressed and drying unevenness can be reduced, and as a result, a large amount of clothing can be dried well.

  According to the clothes dryer which concerns on 3rd invention, when especially load amount is small, compared with the case where the inversion control of a drum like the past is performed, drying performance can be improved and the time which drying operation can shorten can be shortened. .

  An embodiment (first embodiment) of a clothes dryer according to the first invention will be described with reference to the drawings. The clothes dryer according to the present embodiment is a two-stage clothes dryer in which clothes dryers having the same structure are stacked in two upper and lower stages in order to effectively use the installation space. Of course, the present invention can also be applied.

  FIG. 1 is a front plan view of the clothes dryer of this embodiment. In this clothes dryer, an upper clothes dryer 1 is arranged on a lower clothes dryer 2, and the housings 3 of both are integrated. Both clothes dryers 1 and 2 have large circular clothing input ports on the front surface of the housing 3, and each clothing input port can be opened and closed by a laterally opening type circular doors 4 and 5.

  Circuit boards equipped with control circuits and the like for independently controlling the operations of the upper and lower clothes dryers 1 and 2 are intensively disposed between the upper door 4 and the lower door 5. On the right edge, an operation panel is provided separately for upper and lower stages. The operation panel includes a start key 71 for instructing operation start (resumption of operation) as the operation unit 7, a time setting unit 72 for setting a drying operation time, and a temperature setting for setting an ultimate temperature during the drying operation. A unit 73 is provided, and a display unit 8 for displaying such set values and the remaining time during operation is arranged.

  The internal configuration of the upper garment dryer 1 and the lower garment dryer 2 is basically the same. FIG. 2 is a schematic longitudinal sectional view showing an internal configuration of a main part of the upper clothing dryer 1.

  A drying chamber 20 that is substantially sealed by the door 4 is formed inside the housing 3, and a drum 21 having a cylindrical surface and a large number of vent holes 21 a is formed in the drying chamber 20 in a substantially horizontal manner. The main shaft 22 is installed so as to be rotatable. The main shaft 22 is supported by a bearing 24 fixed to the partition wall 23 on the back surface of the drying chamber 20, and a large-diameter main pulley 25 is attached to the rear end of the main shaft 22 protruding rearward of the partition wall 23. . A drum motor 26 is installed on the back of the drying chamber 20, and the rotational driving force of the drum motor 26 is transmitted to the main pulley 25 via a motor pulley 27 and a timing belt 28, whereby the drum 21 rotates at a relatively low speed. Driven.

  An intake passage 31 is formed between the intake wall 30 and the intake port 30 opened on the back surface of the housing 3 in the upper part of the partition wall 23 on the back surface of the drying chamber 20. Gas (city gas or LP gas) is burned in the intake passage 31 A heating unit 32 for heating the air is provided. A drum inlet temperature sensor 33 for detecting the temperature of the hot air supplied into the drying chamber 20 is disposed between the heating unit 32 and the drying chamber 20 in the intake passage 31. The drying chamber 20 communicates with the ventilation chamber 36 through a vent hole 35 formed at the bottom thereof, and further communicates with an exhaust passage 38 that communicates with an exhaust port 39 opened on the back surface of the housing 3 through a lint filter 37. Yes. A fan 41 that is rotationally driven by a fan motor 40 is provided in the exhaust path 38, and when the fan 41 is operated, outside air is sucked from the intake port 30 and supplied to the drying chamber 20, and passes through the drying chamber 20. The air passes through the ventilation chamber 36 and the exhaust passage 38 and is discharged from the exhaust port 39 to the outside of the machine. A drum outlet temperature sensor (corresponding to temperature detecting means in the present invention) 42 for detecting the temperature of the air (exhaust gas) discharged from the drying chamber 20 is disposed in the exhaust passage 38.

  If the heating unit 32 operates (gas combustion is performed) in a state where the air flow is generated, high-temperature air heated by the heating unit 32 is supplied into the drying chamber 20. That is, the heating unit 32, the fan 41, and the like correspond to the heated air feeding unit in the present invention. Then, as indicated by arrows in FIG. 2, the hot air passes through the drum 21 in the drying chamber 20, and heat exchange is performed between the wet clothing housed in the drum 21 and the hot air. And the clothes are dried. Moist air containing water vapor from the clothing passes into the ventilation chamber 36, and foreign matters such as lint from the clothing when passing through the lint filter 37 are removed and finally discharged from the exhaust port 39 to the outside of the machine. The

  FIG. 3 is a block diagram of the control system of the clothes dryer 1 of the present embodiment. A control unit 50 (corresponding to the control means in the present invention) placed at the center of the control is configured around the CPU, and each of the start key 71, time setting unit 72, and temperature setting unit 73 provided on the operation unit 7 An instruction signal corresponding to the operation is input from the door switch 43 that detects the opening / closing of the door 4 (or 5), and the temperature detection signal is input from the drum inlet temperature sensor 33 and the drum outlet temperature sensor 42, respectively. Then, the control unit 50 sends a display control signal such as the remaining operation time to the display unit 8. The control unit 50 also controls the rotation of the drum motor 26 via the drum motor drive unit 51, controls the rotation of the fan motor 40 via the fan motor drive unit 52, and further heats the heating unit 32 via the heating drive unit 53. The igniter 321 for controlling the opening of the gas valve 322 for supplying gas to the gas burner and igniting the gas burner is driven. The control unit 50 is common to the upper garment dryer 1 and the lower garment dryer 2, and the other components are provided separately for the upper and lower stages.

  In the clothes dryer of the present embodiment, the user sets the drying operation time with the time setting unit 72 of the operation unit 7 before the operation is started. Further, the temperature setting unit 73 sets the maximum temperature during the drying operation. This temperature setting is selected from four of 50 ° C., 60 ° C., 70 ° C., and 80 ° C. If the clothing to be dried is made of a fabric that is relatively resistant to heat, the temperature is set. In general, the temperature is reduced to prevent shrinkage and fabric damage, and in the case of a material that is resistant to heat such as cotton, the temperature is generally increased to increase the drying efficiency. When the user presses the start key 71 after making such settings, the drying operation is started. Further, after performing the drying operation for a set time, in order to lower the temperature of the clothes and make it easy for the user to take out, only the air is blown by the operation of the fan 41 and the clothes are stirred by the rotation of the drum 21 without heating. Perform cool-down operation.

  Next, control during the drying operation, which is a feature of the clothes dryer according to the present embodiment, will be described with reference to FIGS. FIG. 4 is a flowchart of this control, FIG. 5 is a diagram showing an example of a temperature change from the start of the drying operation, and FIG. 6 is a diagram showing an example of a change in the rotation speed of the drum 21.

  As described above, when the drying operation is started in accordance with the operation of the start key 71, the control unit 50 first controls the drum motor driving unit 51 so that the drum rotation speed is initially set to 45 rpm and is rotated. As a result, the drum 21 is rotated at 45 rpm, and the internal clothing is stirred. Further, the fan motor drive unit 52 is controlled so as to drive the fan motor 40 at a predetermined rotation speed, and ignition is performed by the igniter 321 via the heating drive unit 53. Thereby, the fan 41 rotates and heated air is supplied into the drying chamber 20 (step S10). Since the temperature of the air supplied to the drying chamber 20, that is, the temperature detected by the drum inlet temperature sensor 33 rises rapidly as indicated by A in FIG. 5, the control unit 50 makes this temperature almost constant around a predetermined temperature. The gas valve 322 is controlled so as to be maintained at the same time.

  Next, the control unit 50 measures the temperature rise ΔT for one minute based on the detection signal from the drum outlet temperature sensor 42 (step S11). As described above, the temperature of the air on the inlet side of the drying chamber 20 rapidly increases, but when the heated air supplied into the drying chamber 20 performs sufficient heat exchange with the wet clothing in the drum 21. Since a large amount of heat is taken from the heated air in the drum 21, the temperature rise of the air on the outlet side of the drying chamber 20 is small. When the clothes accommodated in the drum 21 vary, the heated air easily passes between the clothes and between the fibers of the clothes, so that heat exchange between the heated air and the clothes is performed well. Is called. The temperature change in such a case is indicated by B in FIG. In this case, the temperature rise is moderate.

  On the other hand, when the clothes accommodated in the drum 21 are gathered and in a state close to a lump, the heated air is difficult to pass through the clothes, so that the heat exchange is not sufficiently performed. Further, even when the water-absorbing clothing sticks to the inner peripheral surface of the drum 21 and closes the vent hole 21a, the heated air is difficult to enter into the drum 21 and thus heat exchange is not easily performed. . If the heat exchange is not sufficient, the amount of heat is not deprived from the heated air, so that the temperature of the air rapidly rises also on the outlet side of the drying chamber 20. An example of the temperature change in such a case is indicated by C in FIG.

  In the case of a gradual temperature change as shown in FIG. 5B, the temperature rise width ΔT for 1 minute is, for example, about 1 to 2 ° C., and N is determined in step S12. On the other hand, when a rapid temperature rise as shown in FIG. 5C occurs, the temperature rise width ΔT for 1 minute exceeds 3 ° C., and it is determined as Y in step S12. If the temperature increase width ΔT is 3 ° C. or more, the control unit 50 next determines whether or not the drum rotation speed setting at that time is 55 rpm (step S13). Control is performed to increase the speed by 2.5 rpm (step S14). Therefore, for example, when the current drum rotation speed is the initial speed of 45 rpm, the rotation speed is increased from 45 rpm to 47.5 rpm in step S14.

  When the rotation speed of the drum 21 is increased, the agitation state of the clothes accommodated in the drum 21 changes, so that the clothes that have been clumped up to the dumpling state are easily loosened and easily separated. On the other hand, if it is determined in step S13 that the drum rotational speed is set to 55 rpm, the drum rotational speed is not increased any more, and conversely, the drum rotational speed is decreased to 40 rpm (step S15). Then, regardless of which of steps S14 and S15 is executed, it is determined whether or not the operation has been completed by determining whether or not the preset operation time has elapsed (step S16). If not, the process returns to step S11. If it is determined in step S12 that the temperature increase width ΔT is less than 3 ° C., the process proceeds to step S16. Therefore, the drum rotation speed is maintained as it is, and if the operation has not been completed yet, the process returns to step S11.

  For example, in the case where a temperature rise of 3 ° C. or more continues for one minute by the above-described control, that is, when it can be estimated that good drying cannot be performed due to clothes gathering in the drum 21 or the like, FIG. As shown in D, the drum rotation speed is increased by 2.5 rpm every minute from 45 rpm, once reaching 55 rpm, it is once reduced to 40 rpm, and thereafter it is increased by 2.5 rpm from 40 rpm to 55 rpm. Repeat the change. Normally, due to such a change in the rotational speed, the lump of clothes in the drum 21 is scattered, and changes to a state in which heat exchange with the heated air can be easily performed. On the other hand, for example, when the temperature rise of less than 3 ° C. continues for one minute, that is, when it can be estimated that the clothes in the drum 21 are moderately dispersed and good drying is performed, E in FIG. As shown, the drum rotation speed will be maintained at an initial speed of 45 rpm.

  As described above, in the clothes dryer of the present embodiment, it is possible to reduce the occurrence of tangling of clothes in the drum 21 and clumping into a dumpling, and to prevent drying unevenness and perform a good dry finish.

  Next, a clothes dryer which is an embodiment (second embodiment) of the second invention will be described. Since the basic configuration is the same as that of the clothes dryer according to the first embodiment, characteristic control during the drying operation will be described with reference to FIG.

  In the clothes dryer of the first embodiment, the temperature detected by the drum outlet temperature sensor 42 is used to estimate the state of the clothes in the drum 21. In the clothes dryer of the second embodiment, the drum The motor current supplied from the drum motor driving unit 51 to the drum motor 26 is used to rotate the motor 21. That is, when the drum 21 is rotated at an initial speed (45 rpm) with the start of the drying operation and heated air is started to be supplied into the drying chamber 20 (step S20), the control unit 50 provides the drum motor driving unit 51. Based on the detected current value, the average value P of the motor current fluctuation for 1 minute is measured (step S21).

  If clothes are formed in the drum 21, a large rotational load is applied when trying to lift the collection, and a large motor current flows. Also, when clothes are scattered on the inner periphery of the drum 21, a large rotational load is similarly applied, and a large motor current flows. Therefore, in such a situation, the motor current average value P becomes larger than when the clothes are appropriately dispersed in the drum 21 and can be satisfactorily dried. Therefore, it is next determined whether or not the motor current average value P is equal to or greater than a predetermined threshold value X (step S22). If the motor current average value P is equal to or greater than the threshold value X, the clothing is in a lump state or the inner circumference of the drum 21 It is determined that it is stuck to the surface, and the same processes of steps S23 to S26 as those of steps S13 to S16 are executed.

  Therefore, in the clothes dryer according to the second embodiment, when the clothes are entangled in the drying operation and become clumps or stick to the inner peripheral surface of the drum 21, it is difficult to dry the drum. For example, the rotational speed of 21 varies as indicated by D in FIG.

  Next, a clothes dryer which is an embodiment (third embodiment) of the third invention will be described. Since the basic configuration is the same as that of the clothes dryer according to the first embodiment, characteristic control during the drying operation will be described here with reference to FIGS. FIG. 8 is a flowchart of this control, and FIG. 9 is a diagram showing an example of a temperature change from the start of the drying operation.

  With the start of the drying operation, the controller 50 reversely drives the drum 21 left and right at the initial speed (45 rpm), and starts supplying heated air into the drying chamber 20 (step S31). As this inversion drive, for example, it is possible to repeat this as one cycle of 30 seconds on right rotation-2 seconds off-left rotation 5 seconds on-2 seconds off. When 15 minutes have elapsed since the start of the drying operation (Y in step S31), the temperature increase width ΔT2 from the operation start time is obtained from the temperature detected by the drum outlet temperature sensor 42 (step S32).

  When the amount of clothes accommodated in the drum 21 is small, the heat exchange between the heated air and the clothes in the drum 21 is relatively small compared to the case where the amount of clothes (load amount) is large. The amount of heat taken away from the air is small. Therefore, as indicated by G in FIG. 9, the temperature rise at the drum outlet from the start of the drying operation increases. As a result, for example, the temperature rise width ΔT2 when a predetermined time (15 minutes in this example) has elapsed from the start of operation has a large load amount when the load amount is small (ΔT2 ′ in curve G) as shown in FIG. In the case (ΔT2 in curve F), there is a large difference. Therefore, the control unit 50 determines whether or not the temperature increase width ΔT2 is 10 ° C. or more (step S33), and determines that the load amount is small when it is 10 ° C. or more. When the load is small, the tangling of clothing does not matter so much even if the drum 21 is not rotated in the reverse direction and continues to rotate in either the left or right direction, so control is performed so that the drum 21 is rotated in one direction. Change (step S34).

  When the drum 21 is driven in the reverse direction, the drum 21 is always temporarily stopped as described above. During this time, it is difficult for heated air to enter the drum 21 and the drying efficiency is unavoidably reduced. On the other hand, if the drum 21 is continuously rotated in one direction, the temporary rotation stop of the drum 21 as described above is eliminated, so that the drying efficiency is improved correspondingly and the drying time can be shortened. On the other hand, when the temperature increase width ΔT2 is less than 10 ° C. in step S33, it is determined that the load amount is large, and the inversion driving of the drum 21 is continued (step S35). In this case, since the drum 21 is temporarily stopped, the drying efficiency is inevitably lowered at that time, but even if the load is large, the clothes are hardly entangled. Moreover, since there is no entanglement of clothes, generation | occurrence | production of drying unevenness can also be reduced and favorable drying can be performed as a whole.

  As described above, according to the clothes dryer of this embodiment, it is possible to improve the drying efficiency and shorten the drying time particularly when the load is small.

  It should be noted that each of the above-described embodiments is merely an example, and it is obvious that any modification, correction, or addition as appropriate within the scope of the present invention is included in the scope of the claims of the present application.

The front top view of the clothes dryer by one Example (1st Example) of this invention. The schematic longitudinal cross-sectional view which shows the internal structure of the principal part of an upper stage clothes dryer. The block block diagram of the control system of an upper stage clothes dryer. The flowchart of the control at the time of drying operation. The figure which shows an example of the temperature change after drying operation start. The figure which shows an example of the change of the rotational speed of a drum. The flowchart of the control at the time of drying operation in the clothes dryer of another Example (2nd Example). The flowchart of the control at the time of drying operation in the clothes dryer of another Example (3rd Example). The figure which shows an example of the temperature change from the drying operation start in the clothes dryer of 3rd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 ... Drying chamber 21 ... Drum 21a ... Vent hole 22 ... Main shaft 23 ... Partition wall 24 ... Bearing 25 ... Main pulley 26 ... Drum motor 27 ... Motor pulley 28 ... Timing belt 30 ... Intake port 31 ... Intake passage 32 ... Heating part 35 ... Ventilation port 36 ... ventilating chamber 37 ... lint filter 38 ... exhaust passage 39 ... exhaust port 40 ... fan motor 41 ... fan 42 ... drum outlet temperature sensor 50 ... control unit 51 ... drum motor drive unit 52 ... fan motor drive unit 53 ... heating Drive part

Claims (3)

A drum which is disposed in the drying chamber and accommodates clothes to be dried; a rotation driving unit which rotationally drives the drum; and a heating air supply unit which supplies heating air to an air passage including the drying chamber. In the clothes dryer provided,
Temperature detecting means for detecting the temperature of the air that has passed through the drying chamber;
A control means for obtaining a temperature rise width within a predetermined time by the temperature detection means during a drying operation, and controlling the rotation driving means to change the rotation speed of the drum based on the temperature rise width;
A clothes dryer comprising: A drum which is disposed in the drying chamber and accommodates clothes to be dried; rotation driving means including a motor for rotating the drum; and heating air supply for supplying heated air to the air passage including the drying chamber A clothes dryer comprising:
Temperature detecting means for detecting a current supplied to the motor;
A control means for obtaining an index value reflecting the magnitude of the motor current within a predetermined time by the current detection means during the drying operation, and for controlling the rotation driving means to change the rotational speed of the drum based on the index value;
A clothes dryer comprising: A drum which is disposed in the drying chamber and accommodates clothes to be dried; a rotation driving unit which rotationally drives the drum; and a heating air supply unit which supplies heating air to an air passage including the drying chamber. In the clothes dryer provided,
Temperature detecting means for detecting the temperature of the air that has passed through the drying chamber;
In the initial stage of the drying operation, the temperature detection means determines the temperature increase degree. When the temperature increase degree is relatively large, the drum is rotated in one direction. When the temperature increase degree is relatively small, Control means for controlling the rotation driving means so as to rotate the drum in both left and right directions;
A clothes dryer comprising:

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