JP6683469B2 - Clothes dryer - Google Patents

Description

  The present invention relates to a clothes dryer capable of reducing the temperature of clothes during overdrying and reducing damage to the clothes regardless of the type and amount of clothes.

  BACKGROUND ART Conventionally, there is known a clothes dryer in which a drying air heated by a burner is introduced into a drum into which clothes to be dried are put by a fan and exhausted from a back side of a main body (for example, Patent Document 1). .

  FIG. 5: is a flowchart which shows the process procedure in the drying operation in the conventional clothes dryer. In the clothes dryer disclosed in Patent Document 1, it is usual that the control means performs the processing shown in FIG. 5, and when the start button is pressed, the operation is started and the process proceeds to step T1.

<Step T1>
In step T1, the control means starts the rotation of the drum and the fan. As a result, the supply and exhaust of the drying air to the drum is started.

<Step T2>
In step T2, the control means ignites the burner. As a result, the supply of high-temperature drying air to the drum is started.

<Step T3>
In step T3, the control means starts counting the operating time.

<Step T4>
In step T4, the control means determines whether or not the operation time has reached the end time, and determines whether or not to end the operation. If it is determined that the driving is ended, the process proceeds to step T10, and if it is not determined that the driving is ended, the process proceeds to step T5.

<Step T5>
In step T5, the control means determines whether or not the exhaust temperature has reached the upper limit temperature. When it is determined that the exhaust temperature has reached the upper limit temperature, the process proceeds to step T6, and when it is not determined that the exhaust temperature has reached the upper limit temperature, the process returns to step T4.

<Step T6>
In step T6, the control means stops the burner. As a result, the air for drying, which is not heated, at a substantially normal temperature is supplied to the drum, and the temperature in the drum is lowered.

<Step T7>
In step T7, the control means determines whether or not the operation time has reached the end time, and determines whether or not to end the operation. If it is determined that the driving is ended, the process proceeds to step T10, and if it is not determined that the driving is ended, the process proceeds to step T8.

<Step T8>
In step T8, the control means determines whether the exhaust temperature has reached the relighting temperature. When it is determined that the relighting temperature has been reached, the process proceeds to step T9, and when it is not determined that the relighting temperature has been reached, the process returns to step T7.

<Step T9>
In step T9, the control means reignites the burner, and the process proceeds to step T4. As a result, the supply of high-temperature drying air to the drum is restarted, and the temperature inside the drum rises again.

<Step T10>
In step T10, the control means stops the burner and also stops the rotation of the fan and the drum. This completes this flow.

  Thus, in the conventional clothes dryer, when the exhaust temperature from the drum reaches a predetermined upper limit temperature, the burner (heat source) is stopped to lower the temperature inside the drum, and then the exhaust temperature reaches the predetermined re-ignition temperature. By repeating the process of re-igniting the burner when the temperature drops, an abnormal rise in temperature inside the drum is suppressed, and damage to clothes due to overheating is suppressed.

JP-A-9-290095

  However, in the above-described drying operation, even after the exhaust gas temperature reaches the upper limit temperature, that is, the water content in the clothes decreases and at least some of the clothes are almost dried and become overdried, Since the burner is re-ignited as soon as the temperature decreases to the re-ignition temperature, the inside of the drum is kept at a high temperature and the surface temperature of the clothes remains elevated. Such a state leads to damage to clothes, and the clothes dryer that performs the conventional drying operation has room for improvement in reducing damage to clothes due to heat.

  To solve this problem, it is conceivable to control the burner to stop before the temperature in the drum rises by lowering the upper limit temperature in the latter half of the operation in which the fire extinguishing and ignition of the burner are repeated. However, due to the characteristics of clothes dryers that are preferably used in coin laundry, it is difficult for the clothes dryer to determine the type and weight of clothes stored in the drum, and it is difficult to determine when the second half of operation is to be performed. Therefore, it is difficult to adopt the control.

  The present invention has an object to effectively solve such problems, and can lower the temperature of clothes in the latter half of operation regardless of the kind and amount of clothes, and sufficiently reduce the damage of clothes due to overheating. It is an object of the present invention to provide a clothes dryer that can dry the entire clothes evenly.

  The present invention takes the following measures in view of the above problems.

That is, the clothes dryer of the present invention includes a drum capable of accommodating clothes, an air supply / exhaust unit for supplying / exhausting drying air to / from the drum, and a heating device for heating the drying air supplied to the drum. Means, exhaust temperature detecting means for detecting the temperature of the drying air exhausted from the drum, and when the exhaust temperature detected by the exhaust temperature detecting means reaches a predetermined upper limit temperature, the heating means is stopped, and And a heating control means for performing a temperature adjustment process for restarting the heating means and re-igniting when the exhaust gas temperature drops to a predetermined re-ignition temperature, the heating control means performing re-ignition for adjusting to lower the re-ignition temperature. It has a temperature adjustment unit, the temperature adjustment process is configured to perform gradually pulled down reignition re-ignition temperature through the re-ignition temperature adjusting unit each time a repeated intermittently, the re-ignition temperature The conditioning unit determines the new re-ignition temperature by gradually lowering the re-ignition temperature by a predetermined temperature each time the temperature adjustment process is performed, and the elapsed time from re-ignition until the exhaust temperature reaches the predetermined upper limit temperature. And a correction value is added to the predetermined temperature based on the elapsed time .

  Further, the re-ignition temperature adjusting unit has a lower limit value to the re-ignition temperature, and when the re-ignition temperature reaches the lower limit value by repeating the temperature adjustment process, the re-ignition temperature adjusting unit sets the re-ignition temperature to the re-ignition temperature. It is preferable that the lower limit value is maintained and the heating control unit subsequently re-ignites at the re-ignition temperature.

  Further, it is preferable that the heating means is a non-adjustable burner having no heat power adjusting function.

  According to the present invention described above, the drying air heated by the heating means is supplied into the drum by the air supply / exhaust means to dry the clothes, and the exhaust temperature detected by the exhaust temperature detection means is the upper limit temperature. As a boundary between the first half and the second half of the drying operation, the time when the exhaust temperature reaches the upper limit temperature, not the time when the exhaust temperature decreases to the re-ignition temperature, is used as the standard for restarting the heating means. The temperature control process can be performed by the heating control means in the latter half of the drying operation without strictly estimating the type and amount of clothes to be dried. Then, every time this temperature adjustment process is repeated intermittently, the heating control unit gradually lowers the re-ignition temperature to the required temperature through the re-ignition temperature adjusting unit, so that the clothes are dried by the unheated drying air. While continuing, the temperature inside the drum can be reliably reduced to a temperature lower than that at the previous temperature adjustment processing. Therefore, regardless of the type and amount of clothes to be dried, the peak temperature in the drum for each temperature adjustment process can be gradually decreased in the latter half of the drying operation to decrease the temperature of clothes in the overdry state, While the damage to the clothes due to heat is sufficiently reduced, the entire clothes can be evenly dried.

Particularly, according to the present invention in which the re-ignition temperature adjusting unit lowers the re-ignition temperature step by step by a predetermined temperature, the above-mentioned control which can sufficiently dry the entire clothing while sufficiently reducing the damage to the clothing due to heat Can be achieved easily and gently.
Furthermore, according to the present invention, a correction value is added to the re-ignition temperature according to the elapsed time from the re-ignition to the heating stop. The smooth temperature reduction function can be effectively used.

  Further, according to the present invention, in which the re-ignition temperature adjusting unit sets a lower limit value to the re-ignition temperature, it is possible to prevent the clothing temperature from dropping too much in the latter half of the drying operation, and to ensure the necessary drying performance without falling into insufficient drying. it can.

  Further, according to the present invention in which the heating means is a non-adjustable burner, the manufacturing cost can be reduced as compared with the case where an adjustable burner is used.

The figure which shows the clothes dryer which concerns on one Embodiment of this invention typically. The block diagram which shows the structure of the clothes dryer. The flowchart which shows the process sequence in the drying operation in the clothes dryer. The flowchart corresponding to FIG. 3 which shows the modification of this invention. The flowchart which shows the process procedure in the drying operation in the conventional clothes dryer.

  An embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram schematically showing a clothes dryer 1 according to an embodiment of the present invention. FIG. 1 (a) is a front view of the clothes dryer 1 and FIG. 1 (b) is a clothes dryer 1. It is a side view. FIG. 2 is a block diagram showing the configuration of the clothes dryer 1.

  The clothes dryer 1 of the present embodiment has a device body 10, a drum 20 and a drum case 21, a drum motor 23, a burner 30, an air supply / exhaust means 4, a temperature sensor (thermistor) 31, and a control means 5 ( (See FIG. 2), and is preferably used especially in a coin laundry.

  The inside of the apparatus main body 10 is separated by an upper partition plate 11 and a lower partition plate 12, a combustion chamber 13 is formed in the upper part, a drying chamber 14 is formed in the middle part, and a ventilation chamber 15 and a fan motor chamber 16 are formed in the lower part. It

  The drum 20 is provided in a cylindrical drum case 21 in the drying chamber 14, and is arranged concentrically with the drum case 21 with its axis in the front-back direction of the dryer main body 1. Further, the drum 20 has a diameter slightly smaller than that of the drum case 21 and has a large number of small holes (not shown) on the peripheral surface thereof, and is configured to be able to repeat forward rotation and reverse rotation for loosening clothes. . Such a drum 20 can accommodate clothes L to be dried.

  An intake port 21a (see FIG. 11A) is formed at a position on the upper left side of the drum case 21, and the intake port 21a communicates with a combustion chamber 13 described later via a short ventilation duct 17. An exhaust port 21b (see (a) in the figure) is formed at a lower right position of the drum case 21. A front opening of the drum 20 can be opened and closed by a door 22.

  The drum motor 23 is attached to the upper part on the rear surface side of the apparatus body 10. The drum 20 is driven to rotate by the rotational force of the drum motor 23.

  The burner 30 as a heating unit is provided in the combustion chamber 13 and heats the drying air supplied into the drum 20 through the small holes. Further, the burner 30 is a non-adjustable type that does not have a heat power adjusting function. Gas is supplied to the burner 30 by the gas valve 30b shown in FIG. An igniter 30a (see FIG. 2) is provided near the burner 30.

  The air supply / exhaust unit 4 supplies / exhausts the drying air to / from the drum 20, and includes a supply / exhaust passage 40, an exhaust fan 48a, and a fan motor 48b.

  The supply / exhaust passage 40 includes a combustion chamber 13, a ventilation duct 17, a drum case 21, a ventilation port 40b formed in the lower partition plate 12 facing the exhaust port 21b, a ventilation chamber 15, and a fan motor chamber 16. .

  The ventilation chamber 15 is formed below the lower partition plate 12, and is separated from the fan motor chamber 16 by a partition plate 44 that is arranged substantially vertically. In addition, the air filter 45 is arranged straddling the lower end of the shield plate 42 whose upper end is fixed to the lower partition plate 12 and the lower end of the partition plate 44, and the position of the partition plate 44 to the right of A vent hole 44a (see FIG. 1A) is formed in the air vent.

  In the fan motor chamber 16, an exhaust fan 48a on the front side of the fan partition plate 47 and a fan motor 48b on the rear side of the fan partition plate 47 for rotating the exhaust fan 48a are arranged. An exhaust port 47a (see FIG. 1A) is formed in the upper left part of the fan partition plate 47.

  The temperature sensor 31 as an exhaust temperature detecting means detects the temperature of the drying air exhausted from the drum 20 (exhaust temperature), and is located near the exhaust fan 48a, that is, at the exhaust port 47a of the fan partition plate 47. It is provided. Although it is difficult to measure the temperature inside the drum 20 in operation in real time, the temperature inside the drum 20 is indirectly measured in real time by using the temperature sensor 31.

  The operation of such a clothes dryer 1 is controlled by the control means 5 (see FIG. 2) including a microcomputer. The control unit 5 includes a heating control unit 55, a timer 51, a ROM 53, and a RAM 54, and a microcomputer executes a program (for example, a temperature adjustment process described later) stored in the ROM 53 to perform a predetermined driving operation. Be seen. The RAM 54 temporarily stores data (for example, a re-ignition lowering temperature N described later) used when the above program is executed.

  The control means 5 can output a fan motor drive signal to the fan motor 48b and a drum motor drive signal to the drum motor 23.

  The heating control means 55 can output an ignition signal to the igniter 30a and a gas supply signal to the gas valve 30b.

  Further, the heating control means 55 stops the burner 30 when the exhaust gas temperature detected by the temperature sensor 31 reaches a predetermined upper limit temperature, and restarts the burner 30 and re-ignites it when the exhaust gas temperature drops to a predetermined re-ignition temperature. Temperature adjustment processing. In this embodiment, for example, the upper limit temperature is set to about 70 ° C. and the re-ignition temperature is set to 40 to 45 ° C. in advance.

  Further, the heating control means 55 has a re-ignition temperature adjusting unit 56 for adjusting the re-ignition temperature to be lowered, and the re-ignition temperature is gradually increased through the re-ignition temperature adjusting unit 56 every time the temperature adjusting process is repeated. It is configured to pull down to re-ignite.

  As described above, in the clothes dryer 1 of the present embodiment, the drum 20 capable of accommodating the clothes L, the air supply / exhaust means 4 for supplying / exhausting the drying air to / from the drum 20, and the drum 20 are supplied with air. The burner 30 as a heating means for heating the drying air, the temperature sensor 31 as an exhaust temperature detecting means for detecting the temperature of the drying air exhausted from the drum 20, and the exhaust temperature detected by the temperature sensor 31 are predetermined. Heating control means 55 for stopping the burner 30 when the upper limit temperature is reached, and for restarting the burner 30 when the exhaust gas temperature drops to a predetermined re-ignition temperature and performing re-ignition. Has a re-ignition temperature adjusting unit 56 for performing adjustment to lower the re-ignition temperature, and the re-ignition temperature is gradually increased through the re-ignition temperature adjusting unit 56 every time the temperature adjustment process is repeated intermittently. To re-ignition down trees.

  With such a configuration, the drying air heated by the burner 30 is supplied to the drum 20 by the air supply / exhaust means 4 to dry the clothes L, and at the time when the exhaust temperature reaches the upper limit temperature, it is almost dried. As a boundary between the first half and the second half of the operation, the time when the exhaust temperature reached the upper limit temperature, not the time when the exhaust temperature decreased to the re-ignition temperature, was used as the reference for re-ignition of the burner 30, and the burner 30 was injected into the drum 20. The temperature control process can be performed by the heating control unit 55 in the latter half of the drying operation without strictly estimating the type and weight of the clothes L. Then, every time this temperature adjustment process is repeated intermittently, the heating control unit 55 surely lowers the re-ignition temperature through the re-ignition temperature adjusting unit 56, so that the clothes L are dried by the unheated drying air. While continuing, the temperature inside the drum 20 can be reliably reduced to a temperature lower than that at the previous temperature adjustment processing. Therefore, regardless of the type and amount of the clothes L to be dried, after the latter half of the drying operation, the peak temperature in the drum 20 for each temperature adjustment process is gradually decreased to reduce the temperature of the clothes L in the over-dried state. It is possible to gently lower the temperature, and as compared with the conventional method of continuing the operation at a high temperature, it is possible to sufficiently reduce the damage to the clothing L due to heat and dry the entire clothing L evenly.

  Furthermore, in order to exert such an effect, new sensors are unnecessary, and the conventional mechanical configuration can be adopted without increasing the cost.

  As another method of lowering the clothing temperature after reaching the upper limit temperature, it is conceivable to lower the upper limit temperature itself from the time when the exhaust temperature reaches the upper limit temperature. However, in this method, the time for the exhaust temperature to reach the upper limit temperature again after re-ignition of the burner 30 is shortened, so that the number of ignitions and extinguishments of the burner 30 increases throughout the operation, which is disadvantageous in terms of machine durability. Will be working.

  In the present invention, the number of times the burner 30 is ignited and extinguished is reduced as compared with the above method, which is also advantageous in terms of machine durability.

  Further, while paying attention to the fact that the surface of the clothing L is almost dry at the time when the exhaust temperature reaches the upper limit temperature for the first time, and the already dried portion is more easily damaged by heat than the wet portion, The idea of lowering the re-ignition temperature to lower the temperature inside the drum 20 in a state where there is a high possibility that an undried portion remains is not present in the prior art.

  FIG. 3 is a flowchart showing a processing procedure in the drying operation in the clothes dryer 1. Hereinafter, the processing procedure of the drying operation will be specifically described with reference to FIG. At that time, the initial value of the re-ignition temperature is 45 ° C., the subtraction value (predetermined value) for gradually reducing the re-ignition temperature is 1 ° C., the cumulative value of the subtraction values is the re-ignition lowering temperature N, and the lower limit value of the re-ignition temperature is 40 degreeC.

  This flow is started when the door 22 is opened and the clothes L to be dried are put into the drum 20 and the door 22 is closed, and then a start button (not shown) is pressed.

<Step S1>
In step S1, the control means 5 outputs a drum motor drive signal to the drum motor 23 to start rotation of the drum 20, and outputs a fan motor drive signal to the fan motor 48b to start rotation of the exhaust fan 48a. Let As a result, the air in the fan motor chamber 16 is discharged to the outside of the device, the air flows from the combustion chamber 13 to the fan motor chamber 16 in the supply / discharge passage 40, and the supply / exhaust of the drying air to / from the drum 20 is started. It

<Step S2>
In step S2, the heating control means 55 outputs a gas supply signal to the gas valve 30b to turn on the gas valve 30b, and outputs an ignition signal to the igniter 30a to ignite the burner 30. As a result, the supply of high-temperature drying air to the drum 20 is started.

<Step S3>
In step S3, the control means 5 sets the initial value of the re-ignition lowering temperature N to 0 (° C.).

<Step S4>
In step S4, the control means 5 causes the timer 51 to start counting the operating time.

<Step S5>
In step S5, the control means 5 determines, based on the count value of the timer 51, whether or not the operation time has reached the end time, and determines whether or not to end the operation. When it is determined that the driving is ended, the process proceeds to step S14, and when it is not determined that the driving is ended, the process proceeds to step S6.

<Step S6>
In step S6, the control means 5 determines whether the exhaust gas temperature detected by the temperature sensor 31 has reached the upper limit temperature. When it is determined that the exhaust temperature has reached the upper limit temperature, the process proceeds to step S7, and when it is not determined that the exhaust temperature has reached the upper limit temperature, the process returns to step S5. If the amount of water in the drum 20 is large, the amount of heat is used to evaporate water and the temperature in the drum 20 is hard to rise even if high-temperature drying air is supplied, and the amount of clothes and the amount of water contained therein are increased. As the amount of exhaust gas increases, it takes more time for the exhaust temperature to reach the upper limit temperature. Although it depends on the cloth and amount of the clothing L, when the exhaust temperature first reaches the upper limit temperature, even if the surface of the clothing L is dry, the inside thereof is still in a wet state in many cases.

<Step S7>
In step S7, the heating control unit 55 stops the gas supply to the burner 30 by the gas valve 30b, and stops (extinguishes) the burner 30.

<Step S8>
In step S8, the control means 5 determines, based on the count value of the timer 51, whether or not the operation time has reached the end time, and determines whether or not to end the operation. If it is determined that the driving is ended, the process proceeds to step S14, and if it is not determined that the driving is ended, the process proceeds to step S9.

<Step S9>
In step S9, the control means 5 determines whether the exhaust gas temperature detected by the temperature sensor 31 has dropped to the relighting temperature. If it is determined that the exhaust temperature has dropped to the relighting temperature, the process proceeds to step S10, and if it is not determined that the exhaust temperature has dropped to the relighting temperature, the process returns to step S8.

<Step S10>
In step S10, the re-ignition temperature of the gas supply signal and the ignition signal is lowered by the re-ignition lowering temperature N ° C. through the re-ignition temperature adjusting unit 56.

<Step S11>
In step S11, the heating control unit 55 outputs a gas supply signal to the gas valve 30b and an ignition signal to the igniter 30a to reignite the burner 30.

<Step S12>
In step S12, the heating control means 5 determines whether or not the re-ignition temperature has reached the lower limit value, based on whether or not the re-ignition lowering temperature N has reached a set value (for example, 5 ° C.). When the re-ignition falling temperature N is determined to be 5 ° C. or higher, the process proceeds to step S5, and when the re-ignition falling temperature N is not determined to be 5 ° C. or higher, the process proceeds to step S13.

  That is, when the re-ignition temperature reaches the lower limit value, the re-ignition temperature adjustment unit 56 maintains the re-ignition temperature at the lower limit value (40 ° C.) by maintaining the re-ignition lowering temperature N at the set value, and the heating control means 5 The subsequent temperature adjustment process is performed at the re-ignition temperature. For this reason, the clothing temperature is prevented from dropping too much, and the necessary drying performance is secured without falling into insufficient drying. The lower limit value of the re-ignition temperature, that is, the set value of the re-ignition lowering temperature N is not limited to 5 ° C as long as the effect of the present invention can be exhibited.

<Step S13>
In step S13, the control means 5 adds 1 ° C. to the re-ignition lowering temperature N as a predetermined value. As a result, the re-ignition lowering temperature N is increased by 1 ° C. (re-ignition temperature is decreased by 1 ° C.) each time the temperature adjustment process is performed until the re-ignition lowering temperature N reaches a set value (for example, 5 ° C.). . As described above, the re-ignition lowering temperature N gradually decreases the re-ignition temperature by gradually increasing the re-ignition lowering temperature N with respect to the initial value of the re-ignition temperature for each temperature adjustment process. Since this is performed, it is possible to easily realize the above-described control that can uniformly dry the entire clothing L while sufficiently reducing damage to the clothing L due to heat. Furthermore, since the predetermined value is about 1 ° C., in the latter half of the operation, the peak temperature in the drum 20 for each temperature adjustment process can be adjusted with an appropriate temperature difference that can both reduce the damage to the clothes L and dry the undried portion. It can be lowered. Even when the upper limit of the exhaust gas temperature reaches the upper and lower boundaries of the actual drying operation, the re-ignition lowering temperature N is added little by little, so the peak temperature in the drum 20 for each temperature adjustment process gradually increases. However, it does not significantly affect the drying performance. Of course, the predetermined value is not limited to 1 ° C.

<Step S14>
In step S14, the heating control means 55 stops the burner 30, and the control means 5 also stops the rotation of the exhaust fan 48a and the drum 20, respectively, thereby ending the present flow.

  As described above, the clothes dryer 1 according to the present embodiment has an operation course in which the clothes temperature can be lowered and the damage to the clothes can be reduced when the clothes L are overdried. In the clothes dryer 1, the upper limit temperature is about 70 ° C., the re-ignition temperature is about 40 to 45 ° C., and the additional time A is set to 5 seconds. The peak temperature in the drum 20 during the drying operation could be reduced by about 10 ° C. as compared with the case of performing the above. The experimental numerical values are obtained from Thermolabel (registered trademark) capable of measuring the highest temperature in the drum 20.

  As another method of lowering the clothing temperature during overdrying, use a firepower adjustment type burner that can adjust the firepower in multiple stages, and adjust the firepower of the burner small after the exhaust temperature reaches the upper limit temperature. It is also possible to lower the clothing temperature.

  In this case, depending on the adjustment of the heating power of the burner, it may be possible to reduce the number of ignitions and extinguishments, and there are few problems in terms of machine durability, but since an adjustable burner is used, Manufacturing costs will increase. In the present invention, the temperature inside the drum 20 is adjusted by updating the re-ignition lowering temperature, and since the heating means only needs to be controlled to be ON / OFF, the non-adjustable burner 30 can be used as the heating means. This is particularly advantageous in terms of manufacturing cost of equipment.

  Although one embodiment of the present invention has been described above, the specific configuration of each unit is not limited to the above-described embodiment.

  For example, it is effective that the re-ignition temperature adjusting unit 56 obtains the elapsed time T from the re-ignition until the exhaust temperature reaches the predetermined upper limit temperature, and the correction value is added to the re-ignition falling temperature based on the elapsed time T. Is.

  FIG. 4 is a flowchart corresponding to FIG. 3 showing the procedure. Common parts are denoted by the same reference numerals and the description thereof will be omitted, and the added steps will be described below.

<Step S13a>
In step S13a, counting of the elapsed time from re-ignition (re-ignition elapsed time) is started.

<Step S7a>
In step S7a, the elapsed time required until the exhaust temperature reaches the upper limit temperature is acquired.

<Step S9a>
In step S9a, the correction value α is added to the re-ignition lowering temperature N according to the elapsed time. That is, if the re-ignition lowering temperature N is lowered, the elapsed time until reaching the predetermined upper limit temperature after the re-ignition should be extended, but the elapsed time may hardly change depending on the amount of laundry and the outside air temperature. Therefore, the reignition lowering temperature N is corrected to N + α. If both N and α are 1 ° C., the re-ignition temperature is lowered by 2 ° C. in steps S9a and S10. Whether or not the elapsed time has changed is determined based on whether or not the threshold value (for example, 5 seconds) or more has changed. On the other hand, in some cases, when the elapsed time increases significantly even if the temperature is lowered by 1 ° C. in step S10, α can be configured to take a negative value depending on the situation.

  By doing so, it is possible to feed back the quality of the effect obtained by lowering the re-ignition lowering temperature, and more accurately realize the gentle temperature lowering in the drum.

  Further, in the present embodiment, the burner 30 is used as the heating means, but any other means may be used as long as it can heat the drying air.

  Further, in the above embodiment, the re-ignition temperature in the next temperature adjustment process is determined by adding a predetermined value to the re-ignition lowering temperature N, but the present invention is not limited to this, and the re-ignition temperature is t = 0. May be used as a predetermined variable, or the next relighting temperature may be determined by multiplying the relighting temperature by a predetermined coefficient. Further, a new re-ignition temperature may be determined based on a table in which the number of times the temperature adjustment process is repeated and the re-ignition temperature are associated with each other.

  Other configurations can be variously modified without departing from the spirit of the present invention.

1 ... Clothes dryer 4 ... Air supply / exhaust means 20 ... Drum 30 ... Burner (heating means)
31 ... Temperature sensor (exhaust gas temperature detection means)
55 ... Heating control means 56 ... Re-ignition temperature adjusting section L ... Clothes N ... Re-ignition falling temperature

Claims (3)

A drum that can hold clothes,
An air supply / exhaust means for supplying / exhausting the drying air to / from the drum,
Heating means for heating the drying air supplied to the drum,
Exhaust temperature detecting means for detecting the temperature of the drying air exhausted from the drum,
The temperature at which the heating means is stopped when the exhaust gas temperature detected by the exhaust gas temperature detecting means reaches a predetermined upper limit temperature, and the heating means is restarted to re-ignite when the exhaust gas temperature drops to a predetermined re-ignition temperature. And a heating control means for performing adjustment processing,
The heating control means has a re-ignition temperature adjusting unit for performing adjustment for lowering the re-ignition temperature, and gradually lowers the re-ignition temperature through the re-ignition temperature adjusting unit every time the temperature adjustment process is repeated intermittently. Configured to re-ignite ,
The re-ignition temperature adjustment unit,
Each time the temperature adjustment process is performed, the re-ignition temperature is gradually lowered by a predetermined temperature to determine a new re-ignition temperature,
A clothes dryer , which acquires an elapsed time from re-ignition until the exhaust gas temperature reaches a predetermined upper limit temperature, and adds a correction value to the predetermined temperature based on the elapsed time . The re-ignition temperature adjusting unit has a lower limit value for the re-ignition temperature, and when the re-ignition temperature reaches the lower limit value by repeating the temperature adjustment process, the re-ignition temperature adjusting unit sets the re-ignition temperature to the lower limit value. maintaining the value, clothes dryer of claim 1 wherein the heating control means, characterized in that to re-ignition at the re-ignition temperature later. The clothes dryer according to claim 1 or 2 , wherein the heating means is a non-adjustable burner that does not have a heat power adjusting function.

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