JP2023076743A - Dryer - Google Patents

Abstract

To provide a dryer that performs automatic cleaning of a lint filter and can suppress degradation of drying capability caused by clogging in the filter.SOLUTION: The dryer comprises a housing tub for putting laundry to be dried therein, a dry air generation part for generating dry air to be fed into the housing tub, and a filter part that is for catching lint occurring during drying operation and has an automatic cleaning function. During the drying operation, a determination parameter that changes according to a dried degree of laundry (for example, humidity) is detected and when the determination parameter has fallen below a prescribed first determination threshold value Th1, automatic cleaning of the filter part is executed.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a dryer for drying laundry after washing.

A dryer for drying laundry after washing connects a storage tank for storing the laundry to be dried and a dry air generation unit (usually using a heat pump) that generates dry air through an air circulation path. The dry air generated by the generator is sent into the storage tank to dry the laundry. Further, in such a dryer, a lint filter for collecting lint (thread waste) generated from the laundry during the drying process is arranged in the air circulation path.

If the collected lint is left unattended, the lint filter will become clogged and the drying capacity of the dryer will be reduced. For this reason, the dryer requires cleaning of the lint filter.

Patent Literature 1 discloses a dryer having an automatic lint filter cleaning function. Automatic cleaning in Patent Document 1 is performed at the end of the drying operation or upon detection of filter clogging. Filter clogging is detected based on the wind pressure in the air circulation path (detected by a pressure sensor) and the current value of the blower fan motor (detected by a current sensor).

JP 2017-196271 A

In the dryer disclosed in Patent Document 1, even if the filter is cleaned at the end of the drying operation, clogging of the filter that occurs during the drying operation cannot be prevented. In particular, when laundry such as cotton that produces a large amount of lint is dried, filter clogging may occur at an early stage of the drying operation, and cleaning the filter at the end of the drying operation cannot cope with this.

On the other hand, when automatic cleaning is performed when filter clogging is detected, automatic cleaning of the lint filter can be performed even during the drying operation, and a drastic decrease in the drying ability of the dryer can be prevented. However, even in this case, filter clogging detection based on the wind pressure of circulating air or the motor current value of the blower fan cannot detect clogging of the lint filter until it is clogged to some extent. That is, even if automatic cleaning is performed after detecting clogging of the lint filter, the clogging of the lint filter during the drying operation inevitably lowers the drying capacity.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dryer capable of automatically cleaning a lint filter at an appropriate timing and suppressing deterioration in drying performance due to clogging of the filter. and

In order to solve the above problems, the present invention provides a storage tub for storing laundry to be dried, a dry air generator for generating dry air to be sent to the storage tub, and a lint waste generated during the drying operation. A drying machine having a lint filter and a filter unit having an automatic cleaning function for the lint filter, wherein the parameter detection unit detects a determination parameter that changes according to the dryness of the laundry during the drying operation. and a control section for controlling timing of automatic cleaning of the filter section based on the determination parameter.

According to the above configuration, clogging of the lint filter is detected by using the determination parameter that changes according to the dryness of the laundry and controlling the timing of automatic cleaning of the lint filter based on the determination parameter. Unlike the case where automatic cleaning is performed after cleaning, the automatic cleaning of the lint filter can be performed before the lint filter becomes clogged during the drying operation, and a decrease in drying performance due to filter clogging can be suppressed. .

Further, in the dryer, the parameter detection unit may detect humidity of the air discharged from the storage tank as the determination parameter. Alternatively, the parameter detection unit may be configured to detect, as the determination parameter, a temperature difference between intake air taken into the storage tank and exhaust gas discharged from the storage tank.

Further, in the dryer, the control unit compares the determination parameter with a first determination threshold, and executes automatic cleaning of the filter unit when the determination parameter falls below the first determination threshold. can be

Further, in the dryer, the control unit compares the determination parameter with a first determination threshold, and compares the drying time when the determination parameter falls below the first determination threshold with the time threshold. (1) if the drying time is less than the time threshold, automatic cleaning of the filter unit is not performed; and (2) if the drying time is greater than the time threshold, the filter is It can be configured to execute automatic cleaning of the unit.

Further, in the dryer, the control unit compares the determination parameter with a second determination threshold when the drying time reaches a predetermined time, and (1) the determination parameter exceeds the second determination threshold. (2) if the determination parameter exceeds the second determination threshold, further comparing the determination parameter with the first determination threshold, The automatic cleaning of the filter section may be executed when the determination parameter falls below the first determination threshold value.

According to the above configuration, when it is predicted that no (or little) lint will be generated, automatic cleaning of the filter portion can be disabled. As a result, automatic cleaning is disabled when synthetic fibers are dried, and unnecessary cleaning can be prevented.

Further, the dryer further includes a fabric quality determination unit that determines a fabric quality of the laundry, and the control unit determines the first It can be configured to change the determination threshold.

According to the above configuration, by changing the timing of automatic cleaning of the filter part according to the quality of the laundry, automatic cleaning of the filter part can be performed at a more optimal timing.

The dryer of the present invention uses a determination parameter that changes according to the dryness of the laundry, and controls the timing of automatic cleaning of the lint filter based on this determination parameter. The automatic cleaning of the lint filter can be carried out before it becomes clogged, and it is possible to suppress the deterioration of the drying performance due to clogging of the filter.

1 is a schematic diagram showing an internal configuration of a drum-type washing/drying machine according to Embodiment 1; FIG. It is a schematic diagram which shows one structural example of the filter part in a drum type washing-drying machine. 4 is a block diagram showing a control system relating to filter cleaning timing control in Embodiment 1. FIG. 5 is a graph for explaining the filter cleaning timing control of Embodiment 1 and showing the relationship between the drying time and the humidity of the circulating air. FIG. 9 is a block diagram showing a control system relating to filter cleaning timing control according to Embodiment 2; 7 is a graph illustrating the relationship between the drying time and the intake/exhaust temperature difference for explaining the filter cleaning timing control of the second embodiment. FIG. 11 is a block diagram showing a control system relating to filter cleaning timing control of Embodiment 3; FIG. 10 is a graph for explaining filter cleaning timing control of Embodiment 3, and showing the relationship between drying time and humidity of circulating air when cotton and synthetic fibers are dried. FIG. FIG. 10 is a graph illustrating a modification of the filter cleaning timing control of Embodiment 3, and showing the relationship between drying time and humidity of circulating air when cotton and synthetic fibers are dried. FIG. FIG. 11 is a block diagram showing a control system relating to filter cleaning timing control of Embodiment 4; 10 is a graph for explaining filter cleaning timing control in Embodiment 4 and showing the relationship between drying time and humidity of circulating air when cotton and synthetic fibers are dried.

[Embodiment 1]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Embodiment 1 will exemplify a case where the present invention is applied to a washing/drying machine having both a washing function and a drying function. However, the present invention is not limited to this, and it is also possible to apply the present invention to a dedicated dryer having only a drying function.

FIG. 1 is a schematic diagram showing the configuration of a drum-type washer/dryer (dryer) 10 according to the first embodiment. However, in FIG. 1, only the configuration related to the drying function of the drum-type washer/dryer 10 is illustrated. The drum type washing/drying machine 10 comprises a main body 100 and a door 120, and has a washing tub 110 with a rotating drum 111 inside on the main body 100 side. The washing tub 110 is open on the front side of the main body 100, and its interior is liquid-tightly sealed when the door 120 is closed.

The drum-type washing/drying machine 10 can dry the laundry by sending dry air into the washing tub 110 after washing and dehydrating the laundry put into the washing tub 110 (rotating drum 111). That is, when the drum-type washer/dryer 10 functions as a dryer, the washing tub 110 is used as a storage tub for storing the laundry to be dried.

The drum-type washer/dryer 10 has a dry air generating section 130, a blower fan 140, and a filter section 150 as components for the drying operation. Washing tub 110 , filter section 150 , dry air generating section 130 and blower fan 140 are connected by air circulation path 160 .

The dry air generator 130 is means for changing the moist air sent from the washing tub 110 into dry air. Specifically, the dry air generator 130 has a configuration in which an evaporator 131 and a condenser 132 in a heat pump (refrigerating cycle) are arranged in order from the upstream side in the air flow direction. That is, the moist air sent from the washing tub 110 is dehumidified by the evaporator 131 (moisture in the air is condensed), and the dehumidified air is warmed by the condenser 132 to become dry air. The drum-type washer/dryer 10 also includes other components in the heat pump (compressor, expansion valve, etc.), but these are not shown because they are not arranged in the air circulation path 160. . Blower fan 140 is means for generating air flow in air circulation path 160 .

The filter unit 150 is means for collecting lint generated from the laundry during the drying operation. A configuration example of the filter unit 150 will be described with reference to FIG. However, the structure of the filter unit 150 is not particularly limited as long as it has an automatic filter cleaning function.

The filter unit 150 includes a lint filter 152 and a cleaning arm unit 153 inside a housing 151. The housing 151 is formed with an air inlet 151A and an air outlet 151B. That is, the filter unit 150 passes the circulating air flowing in from the air inlet 151A through the lint filter 152 to collect the lint, and discharges the lint-removed circulating air from the air outlet 151B.

The cleaning arm portion 153 is composed of a rotating arm 153B rotatable around a support shaft 153A and a cleaning member 153C provided at the tip of the rotating arm 153B. The rotating arm 153B is formed in a rectangular frame shape so as not to block the flow of air in the filter section 150, and one side of the rectangular frame is attached to the support shaft 153A. The rotating arm 153B can be driven by a driving unit 170 (see FIG. 3) such as a stepping motor, and moves from the initial position (the position shown in FIG. 2(a)) to the final position (the position shown in FIG. 2(b)). Rotation is possible within the indicated range.

The cleaning member 153C is attached to the side of the rotating arm 153B facing the support shaft 153A. The cleaning member 153C scrapes and cleans the lint on the surface of the lint filter 152 when the rotary arm 153B is rotated from the initial position to the final position. An elastic blade member, a brush member, or the like can be preferably used as the cleaning member 153C so as not to damage the lint filter 152 during cleaning.

The lint removed from the lint filter 152 by the cleaning arm 153 is collected in the lint container 154 inside the housing 151 (see FIG. 2(b)). After cleaning the lint filter 152, the cleaning arm 153 is returned to the initial position (see FIG. 2(c)). The lint collected in the lint container 154 can be easily discarded by the user.

Drum-type washer/dryer 10 according to Embodiment 1 is characterized by automatic cleaning timing control (hereinafter referred to as main timing control) in filter unit 150 . This timing control will be described in detail below.

FIG. 3 is a block diagram showing a control system for this timing control. As shown in FIG. 3, in the drum-type washing/drying machine 10, a humidity sensor (parameter detection section) 201, a threshold storage section 202, and a drive section 170 are connected to a control section 200 that executes this timing control.

Humidity sensor 201 is arranged in air circulation path 160 between washing tub 110 and filter unit 150 . That is, the humidity sensor 201 detects the humidity of the circulating air discharged from the washing tub 110 (the storage tub for storing the laundry to be dried) and inputs the detected value to the control unit 200 . The threshold storage unit 202 stores determination thresholds for this timing control. The control unit 200 determines the cleaning timing based on the detection value of the humidity sensor 201 and the determination threshold value read from the threshold storage unit 202, and drives the drive unit 170 based on the determination result to perform automatic cleaning in the filter unit 150. let it run.

FIG. 4 is a graph showing the relationship between the drying time (elapsed time from the start of the drying operation) and the humidity of the circulating air (detection value of the humidity sensor 201) in the drum-type washer/dryer 10. As shown in FIG. As shown in this graph, since the laundry is wet immediately after the drying operation is started, the humidity of the circulating air discharged from the washing tub 110 is high, almost 100%. As the drying time elapses and the laundry dries, the humidity also decreases.

In this timing control, the humidity (parameter for determination) detected by the humidity sensor 201 is compared with a first determination threshold Th1 (for example, 80%), and when the humidity falls below the first determination threshold Th1, Execute automatic cleaning. That is, the first determination threshold Th1 is a threshold that is compared with the determination parameter and used to determine the execution timing of automatic cleaning.

The lint generated during the drying operation is less likely to occur while the laundry is wet, and tends to occur more as the laundry dries. For this reason, in this timing control, a determination parameter (humidity in this case) that changes according to the dryness of the laundry is used, and based on this determination parameter, the timing of occurrence of lint is predicted, and the early stage when lint occurs. can perform automatic cleaning. As a result, unlike the case where clogging of the lint filter is detected and then automatic cleaning is performed, clogging of the lint filter itself can be prevented during the drying operation, and deterioration of the drying performance due to clogging of the filter can be suppressed. can be done.

Further, in this timing control, the automatic cleaning of the filter unit 150 that is performed during the drying operation is not limited to the one time described above. That is, even if automatic cleaning is performed at an early stage when lint is generated, more lint will be generated later, so it is preferable to perform automatic cleaning multiple times during the drying operation. For example, after the humidity first falls below the first determination threshold Th1 (for example, 80%), automatic cleaning may be performed each time the humidity further drops by 10%.

[Embodiment 2]
In the automatic cleaning timing control in the first embodiment, the case where the humidity of the circulating air is used as the determination parameter has been exemplified. However, the determination parameter used in this timing control is not limited to humidity as long as it changes according to the dryness of the laundry.

FIG. 5 is a block diagram showing a control system for this timing control according to the second embodiment. As shown in FIG. 5, in the drum-type washer/dryer 10, an intake air temperature sensor 211, an exhaust temperature sensor 212, a threshold storage unit 202, and a driving unit 170 are connected to a control unit 200 that executes this timing control. .

An intake air temperature sensor 211 detects the temperature of air (intake air) sucked into the washing tub 110 , and an exhaust temperature sensor 212 detects the temperature of air (exhaust air) discharged from the washing tub 110 . The control unit 200 calculates the temperature difference between the intake air and the exhaust air (hereinafter referred to as intake/exhaust temperature difference). In this timing control, this intake/exhaust temperature difference is used as a determination parameter. In this timing control, the intake air temperature sensor 211, the exhaust temperature sensor 212 and the control section 200 correspond to the parameter detection section described in the claims.

FIG. 6 is a graph showing the relationship between drying time and intake/exhaust temperature difference in drum-type washing/drying machine 10 . As shown in this graph, the intake/exhaust temperature difference rises significantly in a short period of time immediately after the start of the drying operation. This is because the intake air temperature is low immediately after the start of the dry operation, but the intake air temperature rises rapidly as the dry air generating unit 130 is driven.

After the intake air temperature reaches a predetermined temperature by driving the dry air generating unit 130, the intake air temperature does not fluctuate significantly, but the exhaust temperature fluctuates. That is, while the laundry is damp, a lot of heat is taken away to dry the laundry, the temperature of the exhaust air decreases, and the temperature difference between the intake and exhaust air becomes a large value. The exhaust temperature difference becomes smaller. Therefore, as the laundry dries, the temperature difference between intake and exhaust decreases.

In this timing control, the intake/exhaust temperature difference (parameter for determination) is compared with a first determination threshold value Th1′ (for example, 18° C.). , performs automatic cleaning in the filter unit 150 . In this timing control, it is possible to predict when lint will occur based on the dryness of the laundry, which is reflected in the determination parameter (intake/exhaust temperature difference in this case), and perform automatic cleaning at an early stage when lint occurs. can. As a result, unlike the case where clogging of the lint filter is detected and then automatic cleaning is performed, clogging of the lint filter itself can be prevented during the drying operation, and deterioration of the drying performance due to clogging of the filter can be suppressed. can be done.

[Embodiment 3]
The amount of lint generated during the drying operation differs depending on the type of laundry. For example, a large amount of lint is generated when cotton laundry is dried, but little lint is generated when synthetic fiber laundry is dried. However, in the automatic cleaning timing control in Embodiments 1 and 2, the type of laundry is not particularly determined. Therefore, in the timing control of the first and second embodiments, automatic cleaning is executed even when synthetic fibers that do not generate lint are dried, and there is a risk that unnecessary cleaning will occur.

The automatic cleaning timing control according to the third embodiment does not perform the automatic cleaning of the filter unit 150 when it is predicted that no (or little) lint will be generated. As a result, automatic cleaning is disabled when synthetic fibers are dried, and unnecessary cleaning can be prevented.

FIG. 7 is a block diagram showing a control system relating to this timing control according to the third embodiment. The control system shown in FIG. 7 is similar to that shown in FIG. In addition to the first determination threshold Th1 used in the first embodiment, the threshold storage unit 202 stores a time threshold T1. The time threshold T1 is a threshold that is compared with the drying time and used to determine whether automatic cleaning is necessary.

FIG. 8 is a graph showing the relationship between the drying time and the humidity of the circulating air when drying cotton and synthetic fibers in the drum-type washer/dryer 10 . As shown in this graph, when cotton is dried, the laundry dries more slowly and the humidity decrease gradient is smaller. On the other hand, when synthetic fibers are dried, the laundry dries quickly and the gradient of humidity decrease increases. Therefore, in this timing control, execution/non-execution of automatic cleaning is determined based on the change in humidity over time.

In this timing control, the detected humidity (parameter for determination) is compared with a first determination threshold Th1 (eg, 80%). The control unit 200 measures the drying time with the timer 221, and sets the drying time (time ta (cotton) and tb (synthetic fiber) in FIG. 8) at the time when the humidity falls below the first determination threshold value Th1 to the time threshold value. Compare with T1. If the drying time at this time is less than the time threshold value T1, it can be estimated that the laundry was dried quickly and that the laundry was dried for synthetic fibers. In the case of drying synthetic fibers, since it is expected that lint will hardly occur, the automatic cleaning of the filter unit 150 is not executed.

On the other hand, if the drying time exceeds the time threshold value T1 when the humidity falls below the first determination threshold value Th1, it can be estimated that the laundry is dried slowly and that it is cotton. In the case of drying cotton, it is expected that a large amount of lint will be generated, so automatic cleaning of the filter unit 150 is executed at this time.

In the timing control described above, the case of using two thresholds, the first determination threshold Th1 compared with the determination parameter and the time threshold T1 compared with the drying time, has been exemplified. However, the thresholds to be used are not limited to the above examples. As a modification, it is also possible to use two thresholds, a first determination threshold Th1 and a second determination threshold Th2, which are compared with the determination parameters. The second determination threshold Th2 is a threshold that is compared with a determination parameter before the first determination threshold Th1 and used to determine whether automatic cleaning is necessary.

In this modification, as shown in FIG. 9, first, the humidity (humidity ha (cotton), hb (synthetic fiber) in FIG. 9) when the drying time reaches the predetermined time t1 is set to the second determination threshold value Th2. (eg 90%). If the humidity at this time is lower than the second determination threshold Th2, the laundry will dry quickly, and it can be estimated that the synthetic fibers are drying, so the automatic cleaning of the filter unit 150 is not executed.

On the other hand, if the humidity at the predetermined time t1 exceeds the second determination threshold Th2, the laundry is slow to dry, and it can be estimated that the cotton is drying, so the automatic cleaning of the filter unit 150 is executed. In this case, the detected humidity is further compared with a first determination threshold Th1 (for example, 80%), and when the humidity falls below the determination threshold Th1, automatic cleaning in the filter section 150 is performed. In this modification, the timing for determining the necessity of automatic cleaning and the timing for executing automatic cleaning can be changed, so that each can be set to more appropriate timings and determination conditions.

Note that in the present embodiment, the time threshold T1 and the predetermined time t1 may be changed by parameters instead of being fixed values. For example, you may change according to the amount of laundry. The amount of laundry is detected, for example, by rotating the washing tub with the laundry in it before pouring water in the washing operation or during the spin-drying operation, and detecting the current of the drive motor and the number of rotations of the drive motor. A determination can be made based on the results. When the amount of laundry is large, the time threshold T1 and the predetermined time t1 are lengthened, and when the amount of laundry is small, the time threshold T1 and the predetermined time t1 are shortened.

The drying time of laundry tends to be proportional to the amount of laundry. For example, even if the laundry is cotton, the smaller the amount of laundry, the faster the laundry will dry. Therefore, when the amount of laundry is small, the time threshold value T1 and the predetermined time t1 are shortened so that even if the drying time is shortened, automatic cleaning of the filter unit 150 is not possible when the laundry is cotton. can be run. On the other hand, when the amount of laundry is large, the time threshold value T1 and the predetermined time t1 are set longer, so that even if the drying time is long, the automatic cleaning of the filter unit 150 can be performed when the laundry is made of synthetic fibers. can be disabled.

[Embodiment 4]
In the timing control of automatic cleaning in the third embodiment, the case of switching between execution/non-execution of automatic cleaning according to the type of laundry has been exemplified. However, simply switching between execution and non-execution in this manner does not sufficiently cope with cases where a large amount of lint does not occur but a small amount of lint does occur.

The automatic cleaning timing control in the fourth embodiment changes the automatic cleaning timing of the filter unit 150 according to the fabric quality of the laundry, and performs automatic cleaning at a more optimal timing.

FIG. 10 is a block diagram showing a control system for this timing control according to the fourth embodiment. The control system shown in FIG. 10 is similar to that shown in FIG. The threshold storage unit 202 stores two types of first determination thresholds, that is, a first determination threshold Th11 for cotton and a first determination threshold Th12 for synthetic fibers.

The fabric quality determination unit 231 determines the fabric quality of the laundry during washing. For example, the cloth quality determination unit 231 determines the cloth quality of the laundry (for example, whether it is cotton or not) based on the water level change (reflecting the water absorption of the laundry) after a certain period of time has passed since immediately after water supply to the washing tub 110 during washing. synthetic fiber) can be determined.

When the cloth quality determination unit 231 determines that the cloth quality of the laundry is cotton, as shown in FIG. Automatic cleaning in the filter part 150 is performed when it is less than 1 determination threshold value Th11. On the other hand, when the fabric quality determination unit 231 determines that the fabric quality of the laundry is synthetic, the humidity is compared with the first determination threshold Th12 for synthetic fibers, and the humidity exceeds the first determination threshold Th12 (for example, 30%). When it falls below, automatic cleaning in the filter section 150 is executed. As a result, lint that may accumulate on the filter during the drying operation can be automatically cleaned at an appropriate timing, even for synthetic fibers that are less likely to generate lint.

In the above description, the cloth quality determination unit 231 determines the quality of two types, cotton and synthetic fiber. That is, three or more types of first determination thresholds can be used to perform more precise timing control.

Embodiment 1 explained that the automatic cleaning of the filter unit 150 performed during the drying operation may be performed multiple times during the drying operation. This is the same for this timing control, but in this timing control, the number of times of automatic cleaning may be changed according to the determined fabric quality of the laundry. For example, it is possible to increase the frequency of automatic cleaning when the quality of the laundry is determined to be cotton, and decrease the frequency of automatic cleaning when the quality of the laundry is determined to be synthetic.

The embodiments disclosed this time are exemplifications in all respects and are not grounds for restrictive interpretation. Therefore, the technical scope of the present invention is not to be interpreted only by the above-described embodiments, but is defined based on the claims. In addition, all changes within the meaning and range of equivalents to the scope of claims are included.

10 drum-type washing and drying machine (dryer)
100 Main body 110 Washing tub (accommodating tub)
111 rotating drum 120 door 130 dry air generator 140 blower fan 150 filter unit 151 housing 152 lint filter 153 cleaning arm unit 160 air circulation path 170 drive unit 200 control unit (part of parameter detection unit)
201 Humidity sensor (parameter detector)
202 threshold storage unit 211 intake air temperature sensor (part of parameter detection unit)
212 Exhaust temperature sensor (part of parameter detection unit)
221 timer 231 fabric quality determination unit Th1, Th1′, Th11, Th12 first determination threshold Th2 second determination threshold T1 time threshold

In order to solve the above problems, a dryer according to an aspect of the present invention includes a storage tub for storing laundry to be dried, a dry air generation unit for generating dry air to be sent to the storage tub, and A dryer having a lint filter for collecting generated lint and having a filter unit having an automatic cleaning function for the lint filter, wherein a determination parameter that changes according to the dryness of the laundry during drying operation a parameter detection unit for detecting, a cloth quality determination unit for determining the cloth quality of the laundry, and the determination parameter is set according to the cloth quality of the laundry determined by the cloth quality determination unit. and a control unit for controlling the start timing of the automatic cleaning of the filter unit based on the fact that the number is below the 1 determination threshold .

Claims (7)

It has a storage tank for storing laundry to be dried, a dry air generator for generating dry air sent to the storage tank, and a lint filter for collecting lint generated during the drying operation, and has an automatic cleaning function for the lint filter. A dryer comprising a filter unit having
a parameter detection unit that detects a determination parameter that changes according to the dryness of the laundry during the drying operation;
and a control section that controls the timing of automatic cleaning of the filter section based on the determination parameter. The dryer according to claim 1,
The drying machine, wherein the parameter detection unit detects humidity of the air discharged from the storage tank as the determination parameter. The dryer according to claim 1,
The drying machine, wherein the parameter detection unit detects a temperature difference between intake air drawn into the storage tank and exhaust gas discharged from the storage tank as the determination parameter. The dryer according to any one of claims 1 to 3,
The control unit compares the determination parameter with a first determination threshold, and executes automatic cleaning of the filter unit when the determination parameter falls below the first determination threshold. The dryer according to any one of claims 1 to 3,
The control unit compares the determination parameter with a first determination threshold, and compares the drying time when the determination parameter falls below the first determination threshold with the time threshold, (1) the drying if the time is less than the time threshold, do not perform automatic cleaning of the filter unit; and (2) if the drying time is greater than the time threshold, perform automatic cleaning of the filter unit at that time. A dryer characterized by: The dryer according to any one of claims 1 to 3,
The control unit compares the determination parameter with a second determination threshold when the drying time reaches a predetermined time, and (1) if the determination parameter is lower than the second determination threshold, the filter (2) if the determination parameter exceeds the second determination threshold value, the determination parameter is further compared with the first determination threshold value, and the determination parameter is determined to be the first determination threshold value. A drying machine characterized in that automatic cleaning of the filter section is executed when the number falls below the 1 determination threshold. The dryer according to claim 4,
Furthermore, it has a cloth quality determination unit that determines the quality of the laundry,
The drying machine is characterized in that the control section changes the first determination threshold according to the fabric quality of the laundry determined by the fabric quality determining section.

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