JP2020054632A - 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

  The present invention relates to a dryer for drying laundry or the like after washing.

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

  The lint filter causes clogging of the filter when the collected lint is left unattended, and reduces the drying capacity of the dryer. For this reason, in the dryer, it is necessary to clean the lint filter.

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

JP 2017-196271 A

  In the dryer described in Patent Literature 1, even if the filter is cleaned at the end of the drying operation, it is not possible to prevent the filter from being clogged during the drying operation. In particular, when laundry such as cotton, which has a lot of lint, is dried, filter clogging may occur at an early stage of the drying operation, and the filter cleaning at the end of the drying operation cannot cope with this.

  On the other hand, when the automatic cleaning is performed at the time of detecting the filter clogging, the lint filter can be automatically cleaned even during the drying operation, and a drastic decrease in the drying capacity of the dryer can be prevented. However, even in this case, it is not possible to detect the filter clogging based on the wind pressure of the circulating air or the motor current value of the blower fan until a certain degree of clogging occurs in the lint filter. That is, even if automatic cleaning is performed after detecting the clogging of the lint filter, it is inevitable that the drying capacity temporarily decreases due to clogging of the lint filter during the drying operation.

  The present invention has been made in view of the above problems, and has as its object to provide a dryer capable of performing automatic cleaning of a lint filter at an appropriate timing and suppressing a decrease in drying ability due to filter clogging. And

  In order to solve the above-mentioned problems, the present invention provides a storage tub for storing laundry to be dried, a dry air generation unit for generating dry air to be sent into the storage tub, and collecting lint generated during a drying operation. A filter unit having a lint filter and a filter unit having an automatic cleaning function of the lint filter, wherein the parameter detection unit detects a parameter for determination that changes according to the degree of drying of the laundry during the drying operation; A control unit that controls timing of automatic cleaning of the filter unit based on the determination parameter.

  According to the above configuration, the clogging of the lint filter is detected by using the determination parameter that changes according to the degree of drying of the laundry and controlling the timing of automatic cleaning of the lint filter based on the determination parameter. Unlike the case where the lint filter is clogged during the drying operation, unlike the case where the lint filter is clogged, the lint filter can be automatically cleaned during the drying operation, and a decrease in drying ability due to filter clogging can be suppressed. .

  Further, in the above dryer, the parameter detection unit may be configured to detect the humidity of 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 sucked into the storage tank and exhaust gas exhausted from the storage tank.

  In the dryer, the control unit may compare the determination parameter with a first determination threshold, and execute the automatic cleaning of the filter unit when the determination parameter falls below the first determination threshold. It can be.

  Further, in the dryer, the control unit compares the determination parameter with a first determination threshold, and compares a drying time when the determination parameter falls below the first determination threshold with a time threshold. (1) If the drying time is lower than the time threshold, the automatic cleaning of the filter unit is not performed. (2) If the drying time is higher than the time threshold, the filter is The configuration may be such that automatic cleaning of the section is performed.

  Further, in the dryer, the control unit compares the determination parameter at a point in time when the drying time reaches a predetermined time with a second determination threshold, and (1) the determination parameter satisfies the second determination threshold. If it is lower, the automatic cleaning of the filter unit is not performed, and (2) if the determination parameter is higher than the second determination threshold, further comparing the determination parameter with a first determination threshold, An automatic cleaning of the filter unit may be performed when the determination parameter falls below the first determination threshold.

  According to the above configuration, when it is predicted that no lint is generated (or is small), the automatic cleaning of the filter unit can be not executed. Accordingly, automatic cleaning is not performed when the synthetic fiber is dried, and unnecessary cleaning can be prevented.

  Further, the dryer further includes a cloth quality determination unit that determines the cloth quality of the laundry, and the control unit determines the first cloth according to the cloth quality of the laundry determined by the cloth quality determination unit. A configuration in which the determination threshold is changed can be adopted.

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

  The dryer of the present invention uses a parameter for determination that changes according to the degree of drying of the laundry, and controls the timing of automatic cleaning of the lint filter based on the parameter for determination. It is possible to perform automatic cleaning of the lint filter before clogging, and it is possible to suppress a decrease in drying ability due to filter clogging.

It is a schematic diagram which shows the internal structure of the drum type washing and drying machine according to Embodiment 1. It is a schematic diagram which shows one structural example of the filter part in a drum type washing and drying machine. FIG. 3 is a block diagram illustrating a control system related to filter cleaning timing control according to the first embodiment. 6 is a graph for explaining filter cleaning timing control according to the first embodiment and is a graph showing a relationship between a drying time and a humidity of circulating air. FIG. 13 is a block diagram illustrating a control system related to filter cleaning timing control according to the second embodiment. 9 is a graph for explaining filter cleaning timing control according to the second embodiment, and is a graph showing a relationship between a drying time and a difference between an intake and exhaust temperature. FIG. 13 is a block diagram illustrating a control system related to filter cleaning timing control according to a third embodiment. 10 is a graph for explaining filter cleaning timing control according to the third embodiment, and is a graph showing a relationship between a drying time and humidity of circulating air when drying cotton and synthetic fibers. 14 is a graph illustrating a modification of the filter cleaning timing control according to the third embodiment, and is a graph illustrating a relationship between a drying time and humidity of circulating air when cotton and synthetic fibers are dried. FIG. 13 is a block diagram illustrating a control system related to filter cleaning timing control according to a fourth embodiment. 14 is a graph for explaining filter cleaning timing control according to the fourth embodiment and is a graph showing a relationship between a drying time and humidity of circulating air when cotton and synthetic fibers are dried.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the first embodiment, a case where the present invention is applied to a washing and drying machine having both a washing function and a drying function will be exemplified. 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 illustrating a configuration of a drum-type washing / drying machine (drying machine) 10 according to the first embodiment. However, FIG. 1 shows only the configuration relating to the drying function of the drum-type washing / drying machine 10. The drum-type washing / drying machine 10 includes a main body 100 and a door 120, and has a washing tub 110 having a rotating drum 111 therein on the main body 100 side. The washing tub 110 is open on the front side of the main body 100, and the inside thereof is liquid-tightly sealed when the door 120 is closed.

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

  As components for the drying operation, the drum-type washing / drying machine 10 includes a drying air generating unit 130, a blowing fan 140, and a filter unit 150. The washing tub 110, the filter unit 150, the dry air generation unit 130, and the blower fan 140 are connected by an air circulation path 160.

  The dry air generator 130 is means for converting wet 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 (refrigeration 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 (condensation of moisture in the air) by the evaporator 131, and the dehumidified air is heated by the condenser 132 to become dry air. The drum-type washing / drying machine 10 also includes other components (such as a compressor and an expansion valve) of the heat pump, but these are not shown in the drawing because they are not arranged in the air circulation path 160. . The blower fan 140 is a unit that generates a flow of air in the air circulation path 160.

  The filter unit 150 is a unit for collecting lint generated from the laundry during the drying operation. One 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 has a configuration in which a lint filter 152 and a cleaning arm unit 153 are provided inside a housing 151, and an air inlet 151A and an air outlet 151B are formed in the housing 151. That is, the filter unit 150 allows the circulating air flowing from the air inlet 151A to pass through the lint filter 152 to collect the lint, and discharges the circulating air from which the lint has been removed from the air outlet 151B.

  The cleaning arm 153 includes a rotation arm 153B that can rotate around the support shaft 153A, and a cleaning member 153C provided at a tip of the rotation arm 153B. The rotating arm 153B is formed in a rectangular frame shape so as not to obstruct the flow of air in the filter unit 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 an initial position (a position shown in FIG. 2A) to a final position (a position shown in FIG. 2B). It is rotatable in the range shown.

  The cleaning member 153C is attached to a side of the rotating arm 153B that faces the support shaft 153A. The cleaning member 153C cleans by removing the lint on the surface of the lint filter 152 when the rotating arm 153B is rotated from the initial position to the final position. Further, as the cleaning member 153C, an elastic blade member, a brush member, or the like can be suitably used 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 a lint housing 154 in the housing 151 (see FIG. 2B). After the cleaning of the lint filter 152, the cleaning arm 153 is returned to the initial position again (see FIG. 2C). The lint collected in the lint storage unit 154 can be easily discarded by the user.

  The drum-type washing / drying machine 10 according to the first embodiment is characterized by timing control of automatic cleaning in the filter unit 150 (hereinafter, timing control). Hereinafter, this timing control will be described in detail.

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

  The humidity sensor 201 is disposed in the air circulation path 160 between the washing tub 110 and the filter unit 150. That is, the humidity sensor 201 detects the humidity of the circulating air discharged from the washing tub 110 (a storage tub for storing laundry to be dried), and inputs the detected value to the control unit 200. The threshold storage unit 202 stores a determination threshold for the present timing control. The control unit 200 determines the cleaning timing based on the detection value of the humidity sensor 201 and the determination threshold read from the threshold storage unit 202, and drives the driving unit 170 based on the determination result to perform the 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 (the value detected by the humidity sensor 201) in the drum-type washing / drying machine 10. As shown in this graph, since the laundry is wet immediately after the start of the drying operation, the humidity of the circulating air discharged from the washing tub 110 is high, which is almost 100%. Then, the drying time has elapsed, and as 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, the filter unit 150 Perform 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 the automatic cleaning.

  Lint generated during the drying operation is less likely to be generated while the laundry is wet, and tends to increase as the laundry dries. For this reason, in the present timing control, a determination parameter (here, humidity) that changes according to the degree of drying of the laundry is used, and the timing of the occurrence of lint is predicted based on the determination parameter. Can perform automatic cleaning. As a result, unlike the case where the lint filter is clogged and the automatic cleaning is performed, it is possible to prevent the lint filter from being clogged during the drying operation itself, and to suppress a decrease in the drying ability due to the filter clogging. Can be.

  In the present timing control, the automatic cleaning of the filter unit 150 performed during the drying operation is not limited to the above-described one time. That is, even if automatic cleaning is performed at an early stage when lint is generated, lint is further generated after that. Therefore, it is preferable to perform automatic cleaning a plurality of times during the drying operation. For example, it is conceivable that after the humidity first falls below the first determination threshold Th1 (for example, 80%), automatic cleaning is performed every time the humidity further falls by 10%.

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

  FIG. 5 is a block diagram showing a control system relating to the present timing control according to the second embodiment. As shown in FIG. 5, in the drum-type washing / drying machine 10, an intake 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 performs the present timing control. .

  The intake air temperature sensor 211 detects the temperature of air (intake air) sucked into the washing tub 110, and the exhaust air temperature sensor 212 detects the temperature of air (exhaust air) discharged from the washing tub 110. The control unit 200 calculates a temperature difference between the intake air and the exhaust gas (hereinafter, an 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 air temperature sensor 212, and the control unit 200 correspond to a parameter detection unit described in the claims.

  FIG. 6 is a graph showing the relationship between the drying time and the difference between the intake and exhaust temperatures in the drum-type washing and drying machine 10. As shown in this graph, immediately after the start of the drying operation, the difference between the intake and exhaust temperatures greatly increases in a short time. This is because the intake air temperature is low immediately after the start of the drying operation, but the intake air temperature rises sharply by driving the dry air generation unit 130.

  After the intake air temperature reaches a predetermined temperature by driving the dry air generation unit 130, there is no large change in the intake air temperature, but the exhaust gas temperature changes. In other words, while the laundry is moist, much heat is taken to dry the laundry, and the exhaust gas temperature decreases and the intake / exhaust temperature difference becomes a large value. The exhaust gas temperature difference becomes smaller. Therefore, as the laundry dries, the intake and exhaust temperature difference decreases.

  In this timing control, the intake / exhaust temperature difference (determination parameter) is compared with a first determination threshold Th1 ′ (for example, 18 ° C.), and when the intake / exhaust temperature difference falls below the first determination threshold Th1 ′ in the course of decreasing. , The automatic cleaning in the filter unit 150 is executed. In this timing control, it is possible to predict the timing of the occurrence of lint based on the degree of drying of the laundry reflected in the determination parameter (here, the difference between the intake and exhaust temperatures), and to execute automatic cleaning at an early stage when lint occurs. it can. As a result, unlike the case where the lint filter is clogged and the automatic cleaning is performed, it is possible to prevent the lint filter from being clogged during the drying operation itself, and to suppress a decrease in the drying ability due to the filter clogging. Can be.

[Embodiment 3]
The amount of lint generated during the drying operation differs depending on the type of laundry. For example, when cotton laundry is dried, a large amount of lint is generated, but when synthetic fiber laundry is dried, little lint is generated. However, in the automatic cleaning timing control according to the first and second embodiments, the determination regarding the type of the laundry is not particularly performed. Therefore, in the timing control of the first and second embodiments, automatic cleaning is performed even when the synthetic fiber that does not generate lint is dried, and unnecessary cleaning may occur.

  The automatic cleaning timing control according to the third embodiment does not execute the automatic cleaning of the filter unit 150 when it is predicted that no lint is generated (or is small). Accordingly, automatic cleaning is not performed when the synthetic fiber is dried, and unnecessary cleaning can be prevented.

  FIG. 7 is a block diagram showing a control system relating to the present timing control according to the third embodiment. The control system shown in FIG. 7 is similar to that shown in FIG. 3, but a timer 221 is further connected to the control unit 200. The threshold storage unit 202 stores a time threshold T1 other than the first determination threshold Th1 used in the first embodiment. The time threshold value T1 is a threshold value that is compared with the drying time and is used to determine whether or not to execute the automatic cleaning.

  FIG. 8 is a graph showing the relationship between the drying time and the circulating air humidity when drying cotton and synthetic fibers in the drum-type washing / drying machine 10. As shown in this graph, when the cotton is dried, the laundry dries slowly and the decreasing gradient of the humidity decreases. On the other hand, when the synthetic fiber is dried, the laundry dries quickly and the decreasing gradient of the humidity increases. For this reason, in this timing control, execution / non-execution of automatic cleaning is determined based on a temporal change in humidity.

  In this timing control, the detected humidity (parameter for determination) is compared with a first determination threshold Th1 (for example, 80%). The control unit 200 measures the drying time by the timer 221, and determines the drying time (the time ta (cotton) and tb (chemical fiber) in FIG. 8) when the humidity falls below the first determination threshold Th1 as the time threshold. 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 is dried quickly and the synthetic fiber is dried. In the case of drying the synthetic fiber, since it is expected that almost no lint will be generated, the automatic cleaning of the filter unit 150 is not executed.

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

  In the timing control described above, a case where two thresholds, that is, a first determination threshold Th1 that is compared with the determination parameter and a time threshold T1 that is compared with the drying time, is used. However, the threshold used is not limited to the above example. 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 parameter. The second determination threshold value Th2 is a threshold value that is compared with the determination parameter before the first determination threshold value Th1 and is used to determine whether or not execution of automatic cleaning is necessary.

  In this modification, first, as shown in FIG. 9, the humidity (the humidity ha (cotton) and hb (synthetic fiber) in FIG. 9) at the time when the drying time reaches the predetermined time t1 is first determined by the second determination threshold Th2. (For example, 90%). If the humidity at this time is lower than the second determination threshold value Th2, it can be estimated that the laundry is dried quickly and the synthetic fiber is dried, so that 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 dried slowly, and it can be estimated that the cotton is dried, so that 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, the automatic cleaning in the filter unit 150 is executed. In this modified example, the timing for determining whether or not the automatic cleaning is required and the timing for performing the automatic cleaning can be changed, so that each can be set to more appropriate timing and determination conditions.

  In the present embodiment, the time threshold T1 and the predetermined time t1 are not fixed values but may be changed by parameters. For example, it may be changed according to the amount of laundry. The amount of the laundry is, for example, before pouring water in the washing operation or during the spin-drying operation, etc., by rotating the washing tub in a state where the laundry is in the washing tub, the current of the drive motor, the drive rotation speed and the like are detected. A determination can be made based on the result. When the amount of laundry is large, the time threshold T1 and the predetermined time t1 are set to be long, and when the amount of laundry is small, the time threshold T1 and the predetermined time t1 are set to be short.

  The drying time of the laundry tends to be proportional to the amount of the laundry. For example, even if the laundry is cotton, if the amount of the laundry is small, the laundry is dried faster. Therefore, when the amount of laundry is small, the time threshold T1 or the predetermined time t1 is shortened, so that even if the drying time is short, if the laundry is cotton, the automatic cleaning of the filter unit 150 can be performed. Can be executed. On the other hand, if the amount of laundry is large, the time threshold T1 or the predetermined time t1 is set to be long, so that even if the drying time is long, if the laundry is synthetic, the filter unit 150 is automatically cleaned. Can be non-executable.

[Embodiment 4]
In the timing control of the automatic cleaning according to the third embodiment, the case where the execution / non-execution of the automatic cleaning is switched according to the type of the laundry is illustrated. However, only switching between execution and non-execution does not generate a large amount of lint, but cannot sufficiently cope with a case where a small amount of lint occurs.

  In the automatic cleaning timing control according to the fourth embodiment, the automatic cleaning timing of the filter unit 150 is changed according to the quality of the laundry, and the automatic cleaning is performed at more optimal timing.

  FIG. 10 is a block diagram showing a control system related to the present timing control according to the fourth embodiment. The control system shown in FIG. 10 is similar to the control system shown in FIG. 3, but a cloth determination unit 231 is further connected to the control unit 200. Further, the threshold value storage unit 202 stores two types of first determination threshold values, that is, a first determination threshold value Th11 for cotton and a first determination threshold value Th12 for synthetic fibers.

  The cloth quality determination unit 231 determines the cloth quality of the laundry at the time of washing. The cloth quality determining unit 231 may, for example, determine the cloth quality of the laundry (for example, cotton or Or synthetic fiber).

  When the cloth quality of the laundry is determined to be cotton by the cloth quality determination unit 231, as shown in FIG. 11, the humidity is compared with a first determination threshold Th11 (for example, 80%) for cotton, and When the value falls below the one determination threshold Th11, the automatic cleaning in the filter unit 150 is executed. On the other hand, when the cloth determining unit 231 determines that the cloth of the laundry is synthetic fiber, the humidity is compared with the first determination threshold Th12 for synthetic fiber, and the humidity is set to the first determination threshold Th12 (for example, 30%). At this point, the automatic cleaning in the filter unit 150 is executed. This makes it possible to automatically clean, at an appropriate timing, lint which may accumulate on the filter due to the progress of the drying operation even if the synthetic fiber does not easily generate lint.

  In the above description, the cloth quality determination unit 231 determines two types of cloth, cotton and synthetic fiber, but it is also possible to perform three or more types of determination according to the ratio between cotton and synthetic fiber. That is, more precise timing control can be performed using three or more types of first determination thresholds.

  In the first embodiment, the automatic cleaning of the filter unit 150 performed during the drying operation may be performed a plurality of times during the drying operation. This is the same in the present timing control, but in the present timing control, the number of times of automatic cleaning may be changed according to the determined quality of the laundry. For example, it is possible to increase the number of times of automatic cleaning when it is determined that the laundry is cotton, and to decrease the number of times of automatic cleaning when it is determined that the laundry is synthetic fiber.

  The embodiment disclosed this time is an example in all respects, and is not a basis for restrictive interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the claims. In addition, all changes within the meaning and scope equivalent to the claims are included.

10 Drum type washer / dryer (dryer)
100 Body 110 Washing tub (storage tub)
111 Rotating drum 120 Door 130 Dry air generation unit 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 detection unit)
202 Threshold storage unit 211 Intake air temperature sensor (part of parameter detection unit)
212 Exhaust gas temperature sensor (part of parameter detector)
221 Timer 231 Cloth determination unit Th1, Th1 ', Th11, Th12 First determination threshold Th2 Second determination threshold T1 Time threshold

Claims (7)

An automatic cleaning function for the lint filter, including a storage tank for storing laundry to be dried, a dry air generating unit for generating dry air sent to the storage tank, and a lint filter for collecting lint generated during a drying operation. A dryer having a filter unit having:
A parameter detection unit that detects a determination parameter that changes according to the degree of drying of the laundry during the drying operation,
A control unit for controlling a timing of automatic cleaning of the filter unit based on the determination parameter. The dryer according to claim 1, wherein
The dryer wherein the parameter detector detects the humidity of air discharged from the storage tank as the determination parameter. The dryer according to claim 1, wherein
The dryer according to claim 1, wherein the parameter detector detects a temperature difference between intake air sucked 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, wherein
The dryer, wherein the control unit compares the determination parameter with a first determination threshold, and causes the filter unit to perform automatic cleaning when the determination parameter falls below the first determination threshold. The dryer according to any one of claims 1 to 3, wherein
The control unit compares the parameter for determination with a first determination threshold, and compares a drying time at a time when the parameter for determination is less than the first determination threshold with a time threshold, (1) the drying If the time is lower than the time threshold, the automatic cleaning of the filter unit is not executed. (2) If the drying time is longer than the time threshold, the automatic cleaning of the filter unit is executed at that time. A dryer characterized in that: The dryer according to any one of claims 1 to 3, wherein
The control unit compares the determination parameter at the time when the drying time reaches a predetermined time with a second determination threshold, and (1) if the determination parameter is lower than the second determination threshold, the filter Without performing the automatic cleaning of the unit, (2) if the determination parameter is greater than the second determination threshold, further comparing the determination parameter with a first determination threshold, the determination parameter is the A dryer for automatically cleaning the filter unit when the value falls below one determination threshold. The dryer according to claim 4, wherein
Furthermore, a cloth quality determination unit that determines the cloth quality of the laundry is provided,
The dryer, wherein the control unit changes the first determination threshold value according to the cloth quality of the laundry determined by the cloth quality determination unit.

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