CN109423874B

CN109423874B - Clothes dryer

Info

Publication number: CN109423874B
Application number: CN201810717347.6A
Authority: CN
Inventors: 田中豪
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 2017-08-25
Filing date: 2018-07-03
Publication date: 2022-09-13
Anticipated expiration: 2038-07-03
Also published as: JP2019037590A; JP6890068B2; KR102464691B1; KR20190022387A; CN109423874A

Abstract

The invention provides a clothes dryer capable of reliably executing drying operation. The clothes dryer is provided with a clothes containing drum, a fan, a burner, a blowing temperature sensor, a relevant temperature detection mechanism and a control device. The control device is configured to be capable of executing a burner control operation in which the burner is stopped when the associated temperature becomes equal to or higher than a predetermined off threshold after the drying operation is started by operating the burner and the fan, and the burner is operated again when the associated temperature is lower than a predetermined on threshold lower than the predetermined off threshold after the burner is stopped. The control device starts the burner control operation when the correlated temperature is first equal to or greater than a predetermined cutoff threshold after the drying operation is started, and corrects the predetermined cutoff threshold according to the blowing temperature during a period from the start of the drying operation to the time when the correlated temperature is first equal to or greater than the predetermined cutoff threshold.

Description

Clothes dryer

Technical Field

The present invention relates to a clothes dryer.

Background

In patent document 1, there is disclosed a clothes dryer having: a laundry accommodation drum (drum) which accommodates laundry; a burner (burner) for heating air to be supplied from the outside into the laundry storage tub; a blowing temperature sensor for detecting a blowing temperature which is a temperature of air heated by the burner and before being transferred into the laundry accommodation tub; and a control device. In the clothes dryer, a lint filter for preventing lint (lint) generated in the clothes storage drum from being discharged to the outside is provided in an exhaust path for discharging air from the inside of the clothes storage drum to the outside.

In general, when the lint filter is clogged with lint, the amount of air passing through the laundry accommodating drum is reduced. As a result, the blowing temperature becomes higher than before the lint filter is clogged. In the clothes dryer of patent document 1, the control device monitors the blowing temperature detected by the blowing temperature sensor after the drying operation is started by operating the fan and the burner, determines whether or not the lint filter is clogged, and performs the notification operation when the lint filter is clogged.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 6-319898

Disclosure of Invention

When the lint filter is clogged, the lint filter may not be quickly cleaned, and the drying operation may be continued in this state. In such a case, there is a possibility that the drying operation cannot be completed properly.

In the present specification, a dryer capable of appropriately performing a drying operation is disclosed.

The dryer disclosed in this specification has: a laundry accommodating drum for accommodating laundry; a fan for supplying air from outside into the laundry container; a burner for heating air to be supplied into the laundry storage tub; a blowing temperature sensor for detecting a blowing temperature which is a temperature of air heated by the burner and before the air is sent into the laundry accommodation tub; a related temperature detecting means for detecting a related temperature related to drying of the laundry in the laundry storage drum; and a control device. The control device is configured to be capable of executing a burner control operation in which the burner is stopped when the correlated temperature becomes equal to or higher than a predetermined off threshold after the drying operation is started by operating the burner and the fan, and the burner is operated again when the correlated temperature becomes lower than a predetermined on threshold lower than the predetermined off threshold after the burner is stopped. The control device starts the burner control operation when the correlated temperature becomes equal to or greater than the predetermined cutoff threshold for the first time after the drying operation is started, and corrects the predetermined cutoff threshold according to the blowing temperature during a period from when the drying operation is started until the correlated temperature becomes equal to or greater than the predetermined cutoff threshold for the first time.

At a time point (hereinafter referred to as "transition time point") when the relevant temperature first becomes equal to or higher than a predetermined cutoff threshold, there is a high possibility that the blowing temperature is in a steady state. On the other hand, during a period after the drying operation is started until the relation temperature becomes equal to or higher than a predetermined cutoff threshold for the first time, the laundry may be adhered to the lint filter, and the blowing temperature may become high. However, the adhesion of the clothes to the lint filter is often a temporary phenomenon. That is, the adhesion of the laundry to the lint filter is released in a relatively short period of time, and the blowing temperature returns to the original state. In such a situation, the stable blowing temperature may be lower than the blowing temperature at which the temperature becomes high due to the adhesion of the laundry to the lint filter. Even in the case where the blowing temperature temporarily becomes a high temperature, the possibility that the blowing temperature is restored to a stable temperature at the transition time point is high. According to the above configuration, the control device corrects the predetermined cutoff threshold value according to the blowing temperature until the relation temperature becomes equal to or higher than the predetermined cutoff threshold value for the first time after the drying operation is started. Therefore, even when the blowing temperature temporarily becomes high due to a phenomenon that the clothes are stuck to the lint filter or the like, the control device can correct the predetermined cutoff threshold to an appropriate value corresponding to the clogging degree of the lint filter. Therefore, the control device can appropriately perform the drying operation using an appropriate predetermined cutoff threshold. As a result, the drying operation is completed properly. Further, the case where the drying operation is properly completed means that: the drying operation time is appropriate, or the drying state of the laundry after the drying operation is completed is appropriate.

The dryer may further have a notification device for notifying an error. The control device may drive the notification device when the delivery temperature is equal to or higher than a 1 st predetermined value during a period after the start of the drying operation until the relevant temperature becomes equal to or higher than a predetermined cutoff threshold for the first time, and drive the notification device when the delivery temperature is equal to or higher than a 2 nd predetermined value lower than the 1 st predetermined value when the relevant temperature becomes equal to or higher than the predetermined cutoff threshold for the first time after the start of the drying operation.

According to the above configuration, the control device drives the notification device when the delivery temperature is equal to or higher than the 2 nd predetermined value lower than the 1 st predetermined value after the drying operation is started until the correlation temperature is equal to or higher than the predetermined cutoff threshold for the first time. As described above, at the transition time point, the possibility that the blowing temperature is in the steady state is high. Therefore, the control device can appropriately determine whether or not to drive the notification device even when the blowing temperature temporarily becomes high due to, for example, a phenomenon that the clothes are stuck to the lint filter.

In addition, when the blowing temperature is relatively high, it is necessary to notify the user that the lint filter needs to be cleaned as soon as possible. According to the above configuration, the control device drives the notification device when the delivery temperature is equal to or higher than the 1 st predetermined value during a period after the drying operation is started until the correlation temperature first reaches the predetermined cutoff threshold. Thus, the user can be informed as early as possible that cleaning of the lint filter is required.

The control device may correct the predetermined on threshold according to the blowing temperature until the relevant temperature is first equal to or higher than the predetermined off threshold after the drying operation is started.

According to the above structure, the dryer can correct the off threshold, and can correct the on threshold. Accordingly, the number of repetitions of the operation and stop of the burner can be adjusted, and the temperature in the laundry storing drum can be appropriately maintained at a temperature suitable for drying the laundry.

Drawings

Fig. 1 is a diagram schematically showing the structure of a dryer 2 of the embodiment.

Fig. 2 is a flowchart showing a main process of control device 70 according to the embodiment.

Fig. 3 is a flowchart showing a clogging correction process of the control device 70 according to the embodiment.

Fig. 4 is a flowchart showing a process determination process of control device 70 according to the embodiment.

Fig. 5 is a flowchart showing a clothes temperature adjusting process of control device 70 according to the embodiment.

Fig. 6 is a flowchart showing an exhaust gas temperature adjustment process by control device 70 according to the embodiment.

FIG. 7 shows an example of a correction value table according to the embodiment.

Fig. 8 is a graph showing transition of the laundry temperature, the exhaust air temperature, the blowing temperature, the laundry temperature off set value, the laundry temperature on set value, and the operation state of the solenoid valve in the drying operation performed by the dryer 2 of the embodiment.

Description of the reference numerals

2: a clothes dryer; 4: a box body; 6: a door; 8: an operation section; 10: a laundry accommodating drum; 10 a: a front surface opening; 10 b: a rear surface opening; 12: a motor; 14: a fan; 16: a lint filter; 20: an exhaust port; 22: an exhaust temperature thermistor; 30: a burner; 32: a gas supply pipe; 34: an electromagnetic valve; 36: a blowing port; 40: blowing a temperature thermistor; 50: an electrode; 60: a clothing temperature thermistor; 70: a control device; c: clothes are provided.

Detailed Description

(examples)

(Structure of dryer 2; fig. 1)

As shown in fig. 1, the dryer 2 has a cabinet 4, a door 6, a laundry-receiving drum 10, a fan 14, a burner 30, and a control device 70.

The cabinet 4 is a main body of the dryer 2. The above-described components of the dryer 2 are housed in a cabinet 4. An operation unit 8 is provided on the front surface (left side in fig. 1) of the housing 4, and the operation unit 8 is provided with a notification lamp and a plurality of operation buttons. The user can input various instructions to the dryer 2 through the operation unit 8. The door 6 is a door provided on the front surface of the cabinet 4.

The laundry storing drum 10 is a container for storing laundry C to be dried. The laundry receiving drum 10 is rotated by a motor 12. A front opening 10a is opened on the front surface side of the laundry accommodation tub 10, and the front opening 10a is closed by the door 6. The user of the dryer 2 opens the door 6, and can put the laundry C into the laundry accommodation drum 10 through the front opening 10a and take the laundry C out of the laundry accommodation drum 10. Further, a blowing port 36 is opened on the front surface side of the clothing storing tub 10 and on the side of the front surface opening 10a, and the blowing port 36 is used for blowing the air heated by the burner 30 into the clothing storing tub 10.

The electrodes 50 and the laundry temperature thermistor 60 are provided in the laundry accommodation drum 10. The electrodes 50 detect moisture contained in the laundry C. The laundry temperature thermistor 60 detects the temperature of the laundry C (hereinafter, referred to as "laundry temperature") in the laundry accommodation drum 10. As the laundry accommodating drum 10 rotates, the laundry C comes into contact with the electrodes 50 and the laundry temperature thermistor 60, so that the electrodes 50 can detect moisture of the laundry C and the laundry temperature thermistor 60 can detect the temperature of the laundry. Further, a weight sensor, not shown, is provided in the laundry accommodation drum 10. The weight sensor detects the weight of the laundry C in the laundry accommodating drum 10.

Further, a rear opening 10b is opened on the rear surface side (right side in fig. 1) of the laundry accommodation tub 10. The rear surface opening 10b is closed by the lint filter 16. The lint filter 16 is a filter for collecting lint (lint) generated from the laundry C or the like in the laundry accommodating drum 10. The lint filter 16 allows air to pass therethrough, but traps lint contained in the air without allowing the lint to pass therethrough.

The fan 14 is disposed at the rear side of the laundry storing tub 10. By operating fan 14, air is sent into laundry accommodation drum 10 from the outside of cabinet 4 (see arrows W1 to W3 in fig. 1), and air in laundry accommodation drum 10 can be sent out to exhaust port 20 (see arrows W4 to W6 in fig. 1), where exhaust port 20 is formed in the upper surface of cabinet 4 and located near the rear surface (right side in fig. 1). The exhaust temperature thermistor 22 is provided near the exhaust port 20, and detects the temperature of the air sent from the inside of the clothing storage tube 10 to the exhaust port 20 (hereinafter, may be referred to as "exhaust temperature").

The burner 30 is disposed below the laundry accommodating drum 10. The burner 30 heats the air sent into the clothing storing tube 10 from the outside through the blow port 36 by combustion heat generated by burning the gas (see arrow W3). The gas as the fuel is supplied to the burner 30 through the gas supply pipe 32. The gas supply pipe 32 is provided with an electromagnetic valve 34 for opening and closing the gas supply pipe 32. A blowing temperature thermistor 40 is provided between the burner 30 and the blowing port 36. The blowing temperature thermistor 40 is a thermistor for detecting the temperature of the air heated by the burner 30 (i.e., the air (see arrow W3) sent from the blowing port 36 into the laundry accommodation tub 10) (hereinafter referred to as "blowing temperature").

The control device 70 is electrically connected to each component in the cabinet 4 of the dryer 2, and controls the operation of each component. The control device 70 stores a correction value table 72 (see fig. 7). The correction value table 72 will be described later.

(action of the dryer 2)

Next, the operation of the dryer 2 of the present embodiment will be described. The user puts the laundry C into the laundry storing tub 10, inputs a predetermined drying start operation through the operation unit 8 of the dryer 2, and the dryer 2 performs the drying operation. While the drying operation is being executed, the control device 70 executes each process shown in fig. 2 to 6.

(Main treatment; FIG. 2)

Fig. 2 is a flowchart showing a main process executed by the control device 70 in the drying operation of the dryer 2. When the drying start operation is input to operation unit 8, control device 70 starts the main process of fig. 2. At S10, control device 70 rotates motor 12 and fan 14, and operates burner 30. Accordingly, the drying operation is started. Hereinafter, the operation of the burner 30 (i.e., the combustion state) may be referred to as "turning on the burner 30", and the stop of the burner 30 (i.e., the extinction state) may be referred to as "turning off the burner 30".

In S12, control device 70 sets the duty ratio at this time point to the mode 1. Here, the "duty ratio" is a ratio of a period during which the burner 30 is on (hereinafter referred to as an "on period") and a period during which the burner 30 is off (hereinafter referred to as an "off period") in a predetermined unit period (60 seconds in the present embodiment). As will be described in detail later, after the drying operation is started in S10 and the exhaust gas temperature becomes equal to or higher than a predetermined exhaust gas temperature off setting value, the control device 70 performs exhaust gas temperature adjustment control for switching the burner 30 on and off according to the duty ratio (see fig. 6). As shown in fig. 6, there are a plurality of patterns of duty ratios set in advance. For example, in pattern 1, the on period is 50 seconds, and the off period is 10 seconds within 60 seconds of the unit period. In pattern 2, the on period is 45 seconds, and the off period is 15 seconds. In pattern 3, the on period is 40 seconds, and the off period is 20 seconds. Thus, each mode is set to: the on period becomes shorter and the off period becomes longer every 1 rank of the numerical value of the pattern. At S12 of fig. 2, control device 70 sets the duty ratio to mode 1.

In S14, the control device 70 determines in advance the operation course (operation course) of the drying operation based on the weight of the laundry C in the laundry storage tub 10 and the dehydration degree of the laundry C, and determines whether or not the result is rated. The weight of the laundry C is detected by a weight sensor (not shown) in the laundry accommodation drum 10. The dehydration degree of the laundry C is calculated from the frequency of detecting the moisture of the laundry C by the electrodes 50. If the weight and the dehydration degree of laundry C are within the predetermined rated ranges, controller 70 determines that the result of the preliminary determination of the operation progress is rated. In this case, the controller 70 determines yes in S14, and the process proceeds to S16. On the other hand, when the weight or the dehydration degree of laundry C is outside the predetermined rated range (for example, when laundry C is too much or too little (excessive or small amount), when laundry C has already been dried to some extent (high dehydration), or the like), controller 70 determines that the result of the preliminary determination of the operation schedule is not rated. In this case, control device 70 determines no in S14, and the process proceeds to S18. In S14, control device 70 sets a main determination of the operation progress of the drying operation (hereinafter simply referred to as "main determination") to "not determined".

At S16 and S18, control device 70 sets the initial values of the laundry temperature off initial value, the laundry temperature on initial value, the exhaust temperature off initial value, and the exhaust temperature on initial value. Here, the "laundry temperature off initial value" is an initial set value of the laundry temperature that becomes a reference for turning off the burner 30 after the drying operation is started. The "initial value for the clothes temperature on" is an initial set value of the clothes temperature that becomes a reference for turning on the burner 30 again after the burner 30 is turned off once. The "exhaust gas temperature cutoff initial value" is an initial set value of the exhaust gas temperature that becomes a reference for turning off the burner 30 after the drying operation is started. The "initial value of the exhaust temperature on" is an initial set value of the exhaust temperature that becomes a reference for turning on the burner 30 again after turning off the burner 30 once. The values of the initial values set in the case of S16 and the case of S18 are different.

At S16, the laundry temperature off initial value and the laundry temperature on initial value are set to 90 ℃ and 70 ℃, respectively. The exhaust temperature off initial value and the exhaust temperature on initial value are set to 72 ℃ and 71 ℃, respectively.

On the other hand, in S18, the laundry temperature off initial value and the laundry temperature on initial value are set to 85 ℃ and 65 ℃, respectively. The exhaust temperature off initial value and the exhaust temperature on initial value are set to 70 ℃ and 68 ℃, respectively.

At S20, control device 70 sets the clogging degree to "0", and initially sets each of the correction values of the laundry temperature off correction value, the laundry temperature on correction value, the exhaust temperature off correction value, and the exhaust temperature on correction value. Specifically, the control device 70 performs initial setting of each correction value based on the correction value table 72 (see fig. 7). As shown in fig. 7, in the correction value table 72, each correction value corresponds to each clogging degree. At the time point of S20, any correction value is set to 0. The "clothes temperature off correction value" is a value for correcting the clothes temperature off initial value and calculating a clothes temperature off set value, which is a set value of clothes temperature that becomes a reference for turning off the burner 30 after the drying operation is started. The "clothes temperature on correction value" is a value for correcting the above-described clothes temperature on initial value and calculating a clothes temperature on setting value which is a reference clothes temperature for turning on the burner 30 again after turning off the burner 30 temporarily. The "exhaust temperature cutoff correction value" is a value for correcting the exhaust temperature cutoff initial value described above and calculating an exhaust temperature cutoff set value that is a set value of the exhaust temperature that becomes a reference for cutting off the burner 30 after the drying operation is started. The "exhaust temperature on correction value" is a value for correcting the above exhaust temperature on initial value and calculating an exhaust temperature on set value that is a reference exhaust temperature for turning the burner 30 on again after the burner 30 is turned off once.

At S22, control device 70 calculates each of the clothes temperature off set value, the clothes temperature on set value, the exhaust temperature off set value, and the exhaust temperature on set value. The laundry temperature cut-off setting value is a value obtained by subtracting the laundry temperature cut-off correction value from the laundry temperature cut-off initial value. The laundry temperature on setting value is a value obtained by subtracting the laundry temperature on correction value from the laundry temperature on initial value. The exhaust temperature cutoff set value is a value obtained by subtracting the exhaust temperature cutoff correction value from the exhaust temperature cutoff initial value. The exhaust temperature on set value is a value obtained by subtracting an exhaust temperature on correction value from an exhaust temperature on initial value. In S22 immediately after the drying operation is started in S10, the correction values are set to 0(S20), and therefore the set values are the same as the initial values set in S16 or S18.

Subsequently, the control device 70 executes each monitoring at S24 and S26. In S24, control device 70 monitors whether or not the exhaust gas temperature detected by exhaust gas temperature thermistor 22 is equal to or higher than an exhaust gas temperature cutoff set value. When the exhaust temperature is equal to or higher than the exhaust temperature cutoff set value, the control device 70 determines yes at S24 and executes each process from S140 of fig. 6 onward (hereinafter referred to as "exhaust temperature adjustment process").

At S26, control device 70 monitors that the temperature of the laundry detected by laundry temperature thermistor 60 is equal to or higher than the laundry temperature cutoff setting. When the laundry temperature is equal to or higher than the laundry temperature cutoff set value, control device 70 determines yes at S26 and executes the processes subsequent to S110 of fig. 5 (hereinafter referred to as "laundry temperature adjustment process"). On the other hand, in the case where the determination in S24 and S26 is "no", the process proceeds to S28.

In S28, control device 70 determines whether or not the main determination is "complete". When the processing subsequent to S90 in fig. 4 (hereinafter referred to as "progress determination processing") is executed, control device 70 determines that the main determination has been completed. In the case where the main determination has been made, the control device 70 determines yes at S28 and executes the processing after S50 of fig. 3 (hereinafter referred to as "jam correction processing"). On the other hand, if the main determination is not completed, the control device 70 determines no in S28 and the process proceeds to S30.

In S30, the controller 70 monitors whether a predetermined period (for example, 2 minutes and 30 seconds) has elapsed after the drying operation is started in S10. When the predetermined period of time has elapsed after the drying operation is started in S10, control device 70 determines yes in S30 and executes the progress determination process (fig. 4). On the other hand, if the predetermined period has not elapsed, the control device 70 determines no in S30 and executes the clogging correction process (fig. 3).

(clogging correction treatment; FIG. 3)

The content of the jam correction process will be described with reference to fig. 3 and 7. The clogging correction processing is processing for setting respective correction values of the clothes temperature off correction value, the clothes temperature on correction value, the exhaust temperature off correction value, and the exhaust temperature on correction value. In the following processing, the setting of each correction value is performed using the correction value table 72 (see fig. 7). Therefore, in the following description, the explanation of "use of the correction value table 72" is omitted in setting each correction value.

At S50, the control device 70 sets the degree of clogging to "0", and sets each correction value to a correction value corresponding to the degree of clogging 0.

In S52, the control device 70 determines whether or not the blowing temperature detected by the blowing temperature thermistor 40 is 130 ℃ or more and less than 150 ℃. In the case where the blowing temperature is in the range of 130 ℃ or more and less than 150 ℃, the control device 70 determines yes in S52, and the process proceeds to S54. When the lint filter 16 is clogged with lint, the air volume of the air flowing in the ventilation path of the dryer 2 is reduced, and accordingly the blowing temperature becomes high. In the case where the lint filter 16 is hardly clogged, normally, the blowing temperature is maintained in a range lower than 130 ℃, but when the lint filter 16 is clogged, the blowing temperature rises to 130 ℃ or more. Further, as the clogging degree of the lint filter 16 becomes higher, the blowing temperature also becomes higher. In S54, the control device 70 sets the clogging degree to "1" and resets each correction value. At S54, the laundry temperature off correction value is set to 5, the laundry temperature on correction value is set to 5, the exhaust temperature off correction value is set to 3, and the exhaust temperature on correction value is set to 3. When S54 ends, the process advances to S56. On the other hand, in the case where the blowing temperature is out of the range of 130 ℃ or more and less than 150 ℃, the control device 70 determines no in S52, and the process proceeds to S56 while skipping S54.

In S56, the control device 70 determines whether or not the blowing temperature is 150 ℃ or higher and lower than 170 ℃. In the case where the blowing temperature is in the range of 150 ℃ or more and less than 170 ℃, the control device 70 determines yes in S56 and the process proceeds to S58. In S58, the control device 70 sets the clogging degree to "2" and resets the correction values. At S56, the laundry temperature off correction value is set to 10, the laundry temperature on correction value is set to 10, the exhaust temperature off correction value is set to 5, and the exhaust temperature on correction value is set to 5. When S58 ends, the process advances to S60. On the other hand, in the case where the blowing temperature is out of the range of 150 ℃ or more and less than 170 ℃, the control device 70 determines no in S56, and the process proceeds to S60 while skipping S58.

In S60, the control device 70 determines whether or not the blowing temperature is 170 ℃ or higher and lower than 190 ℃. In the case where the blowing temperature is in the range of 170 ℃ or more and less than 190 ℃, the control device 70 determines yes in S60 and proceeds to S62. In S62, the control device 70 sets the clogging degree to "3" and resets the correction values. At S62, the clothing temperature off correction value is set to 15, the clothing temperature on correction value is set to 15, the exhaust temperature off correction value is set to 10, and the exhaust temperature on correction value is set to 10. When S62 ends, the process proceeds to S64. On the other hand, in the case where the blowing temperature is out of the range of 170 ℃ or more and less than 190 ℃, the control device 70 determines no in S60, and the process proceeds to S64 while skipping S62.

In S64, the control device 70 determines whether or not the blowing temperature is 190 ℃ or higher and lower than 210 ℃. If the blowing temperature is in the range of 190 ℃ or higher and lower than 210 ℃, the control device 70 determines yes in S64 and proceeds to S66. In S66, the control device 70 sets the clogging degree to "4" and resets the correction values. At S64, the clothing temperature off correction value is set to 20, the clothing temperature on correction value is set to 20, the exhaust temperature off correction value is set to 15, and the exhaust temperature on correction value is set to 15. When S66 ends, the process proceeds to S68. On the other hand, in the case where the blowing temperature is out of the range of 190 ℃ or more and less than 210 ℃, the control device 70 determines no in S64, and the process proceeds to S68 while skipping S66.

In S68, the control device 70 determines whether or not the blowing temperature is 210 ℃ or higher and lower than 230 ℃. If the blowing temperature is in the range of 210 ℃ or higher and lower than 230 ℃, the control device 70 determines yes in S68 and proceeds to S70. In S70, the controller 70 sets the clogging degree to "5" and resets each correction value. At S68, the clothing temperature off correction value is set to 30, the clothing temperature on correction value is set to 30, the exhaust temperature off correction value is set to 18, and the exhaust temperature on correction value is set to 18. When S70 ends, the process proceeds to S72. On the other hand, in the case where the blowing temperature is out of the range of 210 ℃ or more and less than 230 ℃, the control device 70 determines no in S68, and the process proceeds to S72 while skipping S70.

In S72, the control device 70 determines whether or not the blowing temperature is 230 ℃. In the case where the blowing temperature exceeds 230 ℃, the control device 70 determines no in S72, and the process proceeds to S74. Then, in S74, control device 70 causes the drying operation to be "error-stopped". In this case, control device 70 stops motor 12 and fan 14 and turns off burner 30. Then, control device 70 turns on the notification lamp. When S74 ends, control device 70 causes the drying operation to "end with error". Accordingly, a user viewing the notification light can know that the lint filter 16 is currently clogged and needs cleaning. On the other hand, in the case where the blowing temperature is 230 ℃ or less, the control device 70 determines yes in S72, and the process returns to S22 of fig. 2. That is, at S22, controller 70 recalculates the set values using the correction values (S50, S54, S58, S62, S66, and S70 in fig. 3) set at the time points. Then, the drying operation is continued in accordance with the newly calculated set values.

As described above, during the period until the determination of yes at S24 or S26, the control device 70 repeatedly executes the clogging correction process (fig. 3), and continues the drying operation while updating the set values as needed (S22 of fig. 2) using the latest correction values set during the period.

(progress judgment processing; FIG. 4)

The contents of the process determination processing will be described with reference to fig. 4. The progress determination process is a process executed only once when a predetermined period has elapsed without determining yes at S24 and S26 in fig. 2.

At S90, controller 70 determines the operation progress of the drying operation based on the weight of laundry C in laundry accommodation drum 10 and the dehydration degree of laundry C (main determination), and determines whether or not the result is rated. The processing content of S90 is the same as S14 of fig. 2, and therefore, detailed description is omitted. If it is determined that the determination result of the operation progress is the rated one (yes at S90), the process proceeds to S92. On the other hand, if it is determined that the determination result of the operation schedule is not the rated one (no in S90), the process proceeds to S94. In S90, control device 70 sets the main determination to "determined completed".

The processing of S92, S94 is the same processing as the processing of S16, S18 of fig. 2, respectively. When S92 or S94 ends, the process proceeds to S50 of fig. 3. That is, the control device 70 executes the clogging correction processing.

(clothing temperature adjustment treatment; FIG. 5)

The laundry temperature adjustment process will be described with reference to fig. 5. In S110, the control device 70 determines whether or not the clogging degree is 4 or more. That is, the controller 70 determines whether or not the blowing temperature is 190 ℃. If the clogging degree is 4 or 5, the control device 70 determines yes in S110 and the process proceeds to S112. In S112, control device 70 turns on the notification lamp. Accordingly, a user viewing the notification light can know that the lint filter 16 is currently clogged and needs cleaning. On the other hand, when the clogging degree is 0 to 3, the control device 70 determines no in S110, and the process proceeds to S114 by skipping S110.

In S114, control device 70 turns off burner 30. In S116, the control device 70 monitors that the laundry temperature is lower than the laundry temperature on-set value. When the laundry temperature falls below the laundry temperature on-set value after the burner 30 is turned off, the control device 70 determines yes in S116 and the process proceeds to S118.

In S118, control device 70 switches on burner 30 again. Then, the control device 70 performs monitoring at S120 and S122. In S120, control device 70 monitors whether the exhaust temperature is equal to or higher than an exhaust temperature cutoff set value. When the exhaust temperature is equal to or higher than the exhaust temperature cutoff set value, the control device 70 determines yes in S120 and executes the exhaust temperature adjustment process of fig. 6. In this case, the laundry temperature adjusting process is ended. In S122, control device 70 monitors that the temperature of the laundry reaches the laundry temperature cutoff set value or more. If the laundry temperature is equal to or higher than the laundry temperature off-setting value, control device 70 determines yes in S122 and the process returns to S114. That is, the controller 70 controls the operation of the burner 30 based on the temperature of the laundry until the exhaust temperature becomes equal to or higher than the exhaust temperature cutoff set value.

(exhaust gas temperature adjustment treatment; FIG. 6)

The content of the exhaust gas temperature adjustment process will be described with reference to fig. 6. The processing of S140 and S142 is the same processing as the processing of S110 and S112 in fig. 5, respectively.

In S144, control device 70 turns off burner 30 and starts a turn-off timer for counting the turn-off period. Subsequently, the control device 70 performs monitoring at S146 and 148. In S146, control device 70 monitors whether or not the off period has elapsed after the off timer is turned on in S144. If the off period has not elapsed, control device 70 determines no in S146, and the process proceeds to S148. In S148, the control device 70 monitors that the exhaust gas temperature becomes lower than the exhaust gas temperature on-set value. If the exhaust temperature falls below the exhaust temperature on-set value after the burner 30 is turned off, the control device 70 determines yes in S148 and the process proceeds to S150. On the other hand, when the off period elapses, control device 70 determines yes in S146, and the process skips S148 and proceeds to S150.

In S150, control device 70 turns on burner 30 again, and starts an on-timer for counting the on-period.

In S152, the control device 70 monitors whether or not the on period has elapsed. When the on period has elapsed, control device 70 determines yes in S152, and the process returns to S144. On the other hand, if the on period has not elapsed, control device 70 determines no in S152 and the process proceeds to S154.

The process at S154 is the same as S26 of fig. 2. If the laundry temperature is equal to or higher than the laundry temperature cutoff set value, control device 70 determines yes in S154, and the process proceeds to S156. On the other hand, if the laundry temperature is lower than the laundry temperature off setting value, control device 70 determines no in S154, and the process proceeds to S170. In S156, control device 70 turns off burner 30.

Subsequently, the control device 70 executes monitoring at S158 and S160. In S158, the control device 70 monitors whether the laundry temperature is lower than the laundry temperature on set value. After turning off the burner 30, when the laundry temperature falls below the laundry temperature on-set value, the control device 70 determines yes in S158, and the process proceeds to S160. In S160, the control device 70 monitors that the exhaust gas temperature becomes lower than the exhaust gas temperature on-set value. If the exhaust temperature falls below the exhaust temperature on-set value after the burner 30 is turned off, the control device 70 determines yes in S160 and the process returns to S152.

In S170, control device 70 determines whether or not the exhaust temperature is equal to or higher than the exhaust temperature cutoff set value. If the exhaust temperature is equal to or higher than the exhaust temperature cutoff set value, control device 70 determines yes in S170 and the process proceeds to S172. On the other hand, when the exhaust temperature is lower than the exhaust temperature cutoff set value, control device 70 determines no in S170 and the process returns to S152.

In S172, control device 70 advances the pattern of duty ratios by 1 step. For example, when the duty mode is set to mode 1 (i.e., on: off is 50 seconds: 10 seconds), control device 70 changes the duty mode to mode 2 (i.e., on: off is 45 seconds: 15 seconds) in S172. When S172 ends, the process returns to S144, and control device 70 turns off burner 30 again, and starts the off timer. After that, control device 70 executes the processes of S144 to S172 in accordance with the on period and the off period indicated by the pattern of the duty ratio changed in S172.

As described above, while the drying operation is being executed, the above-described respective processes are executed (see fig. 2 to 6). When a predetermined drying operation time has elapsed or a predetermined drying suspension operation is input to operation unit 8, controller 70 turns off burner 30, stops motor 12 and fan 14, and ends the drying operation. In this case, the processing of fig. 2 to 6 is also ended.

(drying operation; FIG. 8)

An example of the drying operation realized by the processing of fig. 2 to 6 will be described with reference to fig. 8. Fig. 8 is a graph showing transition of the blowing temperature, the exhaust temperature, the laundry temperature off set value, the laundry temperature on set value, and the operation state of the solenoid valve 34. The "on" of the solenoid valve 34 indicates that the burner 30 is in the operating state, and the "off" indicates that the burner 30 is in the stopped state. The exhaust temperature off set value and the exhaust temperature on set value are omitted for easy observation of the graphs. In the drying operation of fig. 8, since the exhaust gas temperature does not exceed the exhaust gas temperature cutoff set value, the initial value, the correction value, and the set value relating to the exhaust gas temperature will not be described below. In the drying operation of fig. 8, the weight of laundry C is 7kg, which is outside the rated range of the weight of laundry C. Further, the drying operation time was set to 45 minutes. In addition, the lint filter 16 is clogged to some extent.

At time T0, when the drying start operation is input from operation unit 8, control device 70 starts the main process (fig. 2). Then, the controller 70 rotates the motor 12 and the fan 14, operates the burner 30 (S10 in fig. 2), and sets the duty ratio to the mode 1 (S12 in fig. 2). Then, controller 70 determines that the result of the preliminary determination of the operation progress is not rated (excessive) (no in S14 of fig. 2), and sets the laundry temperature off initial value and the laundry temperature on initial value to 85 ℃ and 65 ℃, respectively (S18 of fig. 2). Next, controller 70 sets the clogging degree to "0", initially sets the correction values (the laundry temperature off correction value and the laundry temperature on correction value) (S20 in fig. 2), and calculates the setting values (the laundry temperature off setting value and the laundry temperature on setting value) (S22 in fig. 2). At this point in time, each set value is the same value as each initial value.

When the delivery temperature reaches 130 ℃ at time T1, the controller 70 determines that the delivery temperature is in the range of 130 ℃ or higher and lower than 150 ℃ (yes in S52 of fig. 3), changes the clogging degree from 0 to 1, and resets the correction values (S54 of fig. 3). Then, controller 70 corrects the laundry temperature off set value and the laundry temperature on set value to 80 ℃ and 60 ℃, respectively (S22 of fig. 2).

When the blowing temperature reaches 150 ℃ at time T2, the control device 70 determines that the blowing temperature is in the range of 150 ℃ or higher and lower than 170 ℃ (yes in S56 of fig. 3), changes the clogging degree from 1 to 2, and resets the correction values (S58 of fig. 3). Then, the controller 70 corrects the laundry temperature off setting value and the laundry temperature on setting value to 75 ℃ and 55 ℃, respectively (S22 in fig. 2).

When the predetermined time (2 minutes 30 seconds) has elapsed at time T3, control device 70 determines that the predetermined time has elapsed (yes in S30 of fig. 2), and executes the process determination processing of fig. 4. The control device 70 determines that the main determination result of the operation schedule is not the rated one (no in S90 of fig. 4), and specifies the initial values (S92 of fig. 4).

When the blowing temperature reaches 170 ℃ at time T4, the controller 70 determines that the blowing temperature is in the range of 170 ℃ or higher and lower than 190 ℃ (yes in S60 of fig. 3), changes the clogging degree from 2 to 3, and resets the correction values (S62 of fig. 3). Then, controller 70 corrects the laundry temperature off set value and the laundry temperature on set value to 70 ℃ and 50 ℃, respectively (S22 of fig. 2).

In the drying operation of fig. 8, the blowing temperature temporarily increases during a period from a time immediately before the time T5 to a time T6. This is because the laundry C is adhered to the lint filter 16. In this case, when the blowing temperature reaches 190 ℃ at time T5, the control device 70 determines that the blowing temperature is in the range of 190 ℃ or higher and lower than 210 ℃ (yes in S64 of fig. 3), changes the clogging degree from 3 to 4, and resets the correction values (S66 of fig. 3). Then, the controller 70 corrects the laundry temperature off setting value and the laundry temperature on setting value to 65 ℃ and 45 ℃, respectively (S22 in fig. 2).

When the adhesion of the laundry C to the lint filter 16 is released at time T6, the blowing temperature rapidly decreases. When the blowing temperature is lower than 190 ℃ at time T7, the controller 70 determines that the blowing temperature is in the range of 170 ℃ or higher and lower than 190 ℃ (yes in S60 of fig. 3), changes the clogging degree from 4 to 3, and resets the correction values (S62 of fig. 3). That is, the control device 70 reduces the clogging degree. Then, controller 70 corrects the laundry temperature off set value and the laundry temperature on set value to 70 ℃ and 50 ℃, respectively (S22 of fig. 2).

When the blowing temperature reaches 190 ℃ at time T8, the control device 70 determines that the blowing temperature is in the range of 190 ℃ or higher and lower than 210 ℃ (yes in S64 of fig. 3), changes the clogging degree from 3 to 4, and resets the correction values (S62 of fig. 3). Then, the controller 70 corrects the laundry temperature off setting value and the laundry temperature on setting value to 65 ℃ and 45 ℃, respectively (S22 in fig. 2).

When the blowing temperature is lower than 190 ℃ at time T9, the controller 70 determines that the blowing temperature is in the range of 170 ℃ or higher and lower than 190 ℃ (yes in S60 of fig. 3), changes the clogging degree from 4 to 3, and resets the correction values (S62 of fig. 3). Then, the controller 70 corrects the laundry temperature off setting value and the laundry temperature on setting value to 70 ℃ and 50 ℃, respectively (S22 in fig. 2).

When the laundry temperature reaches 70 c at time T10, control device 70 determines that the laundry temperature is equal to or higher than the laundry temperature off setting value (yes in S26 of fig. 2), and performs the laundry temperature adjustment process of fig. 5. After that, controller 70 controls the operation of burner 30 by using the clothes temperature off set value (70 ℃) and the clothes temperature on set value (50 ℃) at the time point of time T10. The control device 70 determines that the clogging degree is lower than 4 (S110 in fig. 5), turns off the burner 30 without lighting the notification lamp (S114 in fig. 5). If the laundry temperature is lower than 50 ℃ after stopping burner 30 (yes in S116 of fig. 5), control device 70 turns on burner 30 again (S118 of fig. 5). When the temperature of the laundry becomes 70 ℃ or higher after turning on the burner 30 again (yes in S122 of fig. 5), the controller 70 turns off the burner 30 (S114 of fig. 5). The control device 70 repeatedly executes these processes until 45 minutes elapses from the start of the drying operation.

The structure and operation of the dryer 2 of the present embodiment are explained above. As described above, after the drying operation is started, the blowing temperature becomes a stable temperature at the time point when the temperature of the laundry becomes equal to or higher than the laundry temperature cutoff set value for the first time (time T10 in fig. 8, hereinafter referred to as "transition time point"). On the other hand, during the period from the start of the drying operation to the time when the temperature of the laundry becomes equal to or higher than the laundry temperature cutoff set value for the first time (time T0 to time T10 in fig. 8), the laundry C adheres to the lint filter 16, and the blow temperature temporarily becomes high (time T5 to time T6 in fig. 8). However, the adhesion of the laundry C to the lint filter 16 is a temporary phenomenon in many cases. That is, the adhesion of the laundry C to the lint filter 16 is released in a relatively short period of time, and the blowing temperature returns to the original state. In such a situation, the stabilized blowing temperature (the blowing temperature at the time point of time T10 in fig. 8) may be lower than the blowing temperature at which the temperature becomes high due to the adhesion of the laundry C to the lint filter 16 (the blowing temperature at the time point of time T6 in fig. 8). Even in the case where the blowing temperature temporarily becomes a high temperature due to the laundry C adhering to the lint filter 16, there is a high possibility that the blowing temperature is restored to a stable temperature at the transition time point. According to the above configuration, controller 70 corrects the clothes temperature cutoff set value according to the blowing temperature until the clothes temperature is first equal to or higher than the clothes temperature cutoff set value after the drying operation is started. Therefore, even when the blowing temperature temporarily becomes high due to a phenomenon such that the laundry C is stuck to the lint filter 16, the control device 70 can correct the laundry temperature cutoff setting value to an appropriate value corresponding to the clogging degree of the lint filter 16. Therefore, control device 70 can appropriately perform the drying operation (the drying operation after time T10 in fig. 8) using the appropriate clothes temperature cutoff setting value. As a result, the drying operation is completed appropriately. Further, the case where the drying operation is properly completed means that: the drying operation time is appropriate, or the drying state of laundry C after the drying operation is completed is appropriate.

Further, when the laundry temperature is first equal to or higher than the laundry temperature cutoff set value after the drying operation is started (yes in S26 of fig. 2), control device 70 turns on the notification lamp when the blowing temperature is 190 ℃ (S110 and S112 of fig. 5). At the transition time point, the possibility that the blowing temperature becomes a relatively stable temperature is high. Therefore, the control device 70 can appropriately determine whether or not the notification lamp is turned on when the blowing temperature temporarily becomes high due to, for example, the clothes C adhering to the lint filter 16.

In addition, in the case where the blowing temperature is relatively high (230 ℃ or more in the present embodiment), it is necessary to notify the user as soon as possible that the lint filter 16 needs to be cleaned. According to the above configuration, when the blower temperature is 230 ℃ or higher (yes in S72 of fig. 3) until the clothes temperature becomes equal to or higher than the clothes temperature cutoff set value for the first time after the drying operation is started, controller 70 turns on the notification lamp. Therefore, the user can be informed as early as possible that the lint filter 16 needs to be cleaned.

In the present embodiment, control device 70 corrects the clothes temperature on correction value and the exhaust temperature on correction value together with the clothes temperature off correction value and the exhaust temperature off correction value in the jam correction process of fig. 3. Therefore, the clothes temperature and the exhaust temperature (i.e., the clothes temperature on setting value and the exhaust temperature on setting value) which become the references when the burner 30 is turned on can be corrected together with the clothes temperature and the exhaust temperature (i.e., the clothes temperature off setting value and the exhaust temperature off setting value) which become the references when the burner 30 is turned off. Therefore, the number of repetitions of turning on and off the burner 30 can be adjusted to properly maintain the temperature inside the laundry-receiving drum 10 at a temperature suitable for drying the laundry C.

(corresponding relationship)

The laundry temperature or the exhaust temperature is an example of the "associated temperature". The clothing temperature thermistor 60 or the exhaust temperature thermistor 22 exemplifies "related temperature detection means". The laundry temperature cutoff set value or the exhaust temperature cutoff set value is an example of the "predetermined cutoff threshold". The laundry temperature on setting value or the exhaust temperature on setting value is an example of "predetermined on threshold". The notification lamp of the operation unit 8 is an example of "notification device". 230 ℃ in S72 and 190 ℃ in S64 are the "1 st predetermined value" and "2 nd predetermined value", respectively.

The embodiments have been described in detail, but these are merely examples and are not intended to limit the scope of the claims. The techniques described in the scope of the claims include various modifications and alterations to the specific examples described above.

(modification 1)

The controller 70 may turn on the notification lamp when the supply temperature becomes 190 ℃ before the clothes temperature exceeds the clothes temperature off-set value, that is, before the clothes temperature adjustment process is started, and turn off the notification lamp when the supply temperature returns to below 190 ℃. The controller 70 may turn on the notification lamp when the time for which the supply temperature is 190 ℃.

(modification 2)

Controller 70 may set only the clothes temperature off correction value and the exhaust temperature off correction value at S20 in fig. 2 and S54, S58, S62, S66, and S70 in fig. 3, and omit the setting of the clothes temperature on correction value and the exhaust temperature on correction value. In this case, at S22 in fig. 2, the control device 70 may directly determine the laundry temperature on initial value and the exhaust temperature on initial value as the laundry temperature on set value and the exhaust temperature on set value, respectively (that is, the calculation of the subtraction correction value may not be performed).

The technical elements described in the specification and drawings exhibit technical usefulness alone or in various combinations, but are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in the present specification or the drawings can achieve a plurality of objects at the same time, and achieving one of the objects has technical usefulness by itself.

Claims

1. A clothes dryer characterized by having:

a laundry storing drum for storing laundry;

a fan for supplying air from outside into the laundry container;

a burner for heating air supplied into the laundry storage drum;

a blowing temperature sensor for detecting a blowing temperature which is a temperature of the air heated by the burner and before the air is transferred into the laundry accommodation tub;

a related temperature detecting means for detecting a related temperature related to drying of the laundry in the laundry storage drum; and

a control device for controlling the operation of the motor,

the control device is configured to be capable of executing a burner control operation in which the burner is stopped when the correlated temperature becomes equal to or higher than a predetermined off threshold after the drying operation is started by operating the burner and the fan, and the burner is operated again when the correlated temperature is lower than a predetermined on threshold lower than the predetermined off threshold after the burner is stopped,

the control device is configured to control the operation of the motor,

starting the burner control operation when the temperature of the drying operation is first equal to or higher than the predetermined cut-off threshold after starting the drying operation,

during a period after the drying operation is started until the correlation temperature is first equal to or higher than the predetermined cutoff threshold, the predetermined cutoff threshold is corrected to a lower side when the blowing temperature is high, and the predetermined cutoff threshold is corrected to a higher side when the blowing temperature is low.

2. The clothes dryer of claim 1,

there is also a notification means for notifying an error,

the control device is configured to control the operation of the motor,

driving the informing means when the blowing temperature is a 1 st predetermined value or more during a period from when the drying operation is started to when the correlation temperature is first equal to or more than the predetermined cutoff threshold,

when the temperature is equal to or higher than the predetermined cutoff threshold for the first time after the drying operation is started, the notification device is driven when the blowing temperature is equal to or higher than a 2 nd predetermined value that is lower than the 1 st predetermined value.

3. The clothes dryer according to claim 1 or 2,

the control device is configured to control the operation of the motor,

during a period after the drying operation is started until the temperature of the air conditioner becomes equal to or higher than the predetermined off threshold for the first time, the predetermined on threshold is corrected to a lower side when the air temperature is high, and the predetermined on threshold is corrected to a higher side when the air temperature is low.