JPH119898A - Clothing drying machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the temperature of clothing reliably as shortening the time of cooling-down operation of clothing as much as possible after heating and drying. SOLUTION: In the case that the temperature of the outlet of a drum continuously exceeds 50 deg.C (S19→S20→S21) within l minute from the point in time that the predetermined time of cooling-down operation is completed (S18), operating time is extended by 3 minutes (S22). In the case that the temperature of the outlet of the drum is less than 40 deg.C continuously for 10 seconds (S13→S14→S15), in the case that the temperature of the outlet of the drum does not exceed 50 deg.C continuously for 10 seconds and that operating time has elapsed (S19→S25→S26), and in the case that the temperature of the outlet of the drum further exceeds 50 deg.C continuously for 10 seconds after the extension of operating time 8 times (S23→S24), a motor is turned off and cooling down is completed (S16).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a clothes dryer.

[0002]

2. Description of the Related Art A home-use clothes dryer sends dehydrated hot air into a drum containing wet clothes and cools the wet hot air containing moisture evaporated from the clothes to dehumidify and dry the air. Is reheated by a heater and circulated to the drum. The drum is rotated slowly about a horizontal axis, which causes the clothes in the drum to be agitated and an even drying to be performed.

At the end of such a drying operation, the temperature of the clothes in the drum has been high (usually 60 ° C. or higher). For this reason, for example, when oil or a flammable substance remains in clothing, spontaneous ignition may occur if the rotation of the drum is stopped and the high-temperature clothing is left in the drum as it is. Therefore, in the clothes dryer, in order to stop the operation in a state where the temperature of the clothes is lowered, a cool-down operation is performed in which the unheated air is circulated through the drum while rotating the drum after the drying operation.

[0004]

The longer the cool-down operation time, the more reliably the temperature of the clothes in the drum can be lowered. On the other hand, in order to shorten the time required for the entire drying operation, it is desirable that the cool-down operation time be as short as possible. Therefore, in the conventional clothes dryer, for example, a relatively long predetermined cool-down operation time is set in advance, and even before the operation time ends, the temperature in the drum is continuously maintained for a predetermined time. If the temperature falls below the temperature, the cool-down operation is terminated.

However, the speed at which the temperature in the drum falls during the cool-down operation is greatly affected by the amount of clothing contained in the drum, the type of fibers thereof, and the outside air temperature. For this reason, depending on the conditions, there is a possibility that the temperature of the clothes in the drum does not drop sufficiently even after the predetermined cool-down operation time has ended. In addition, if you set the cool down driving time in anticipation of such a thing,
The driving time could be very long.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to reduce the time required for the cool-down operation as much as possible and to surely lower the temperature of the garment. An object of the present invention is to provide a dryer.

[0007]

According to a first aspect of the present invention, there is provided a clothes dryer in which heated air is sent to a drum containing clothes, and the air passing through the drum is cooled. After performing the drying operation of circulating the drying air after dehumidifying the drying air, the clothing drying machine performs the cooling down operation in which the rotation of the drum is continued and the cooling air is sent into the drum. Temperature detecting means for detecting a temperature; b) first temperature determining means for determining whether a temperature detected by the temperature detecting means is equal to or less than a first specified value during a cool-down operation; c) cool-down A second temperature determining means for determining whether or not the temperature detected by the temperature detecting means exceeds a second specified value higher than the first specified value during a period which is a predetermined time earlier than the end of the operation time; D) the number Operating time extending means for extending the cool-down operation time when the detected temperature exceeds the second specified value by the temperature determining means; e) detecting the detected temperature by the first temperature determining means; And an operation control means for terminating the cool-down operation when it is determined that the cool-down operation time is equal to or less than a prescribed value of 1 or when a predetermined cool-down operation time has elapsed.

In a second clothes dryer according to the present invention, in the first clothes dryer, the second temperature judging means detects the temperature during a period that is a predetermined time before the end of the cool-down operation time. It is characterized in that it is determined whether or not the temperature detected by the means continuously exceeds a second specified value for a predetermined time.

A third clothes dryer according to the present invention is characterized in that in the first or second clothes dryer, the operation time extending means limits the extension operation of the cool down operation time to a predetermined number of times. I have.

[0010] In a fourth clothes dryer according to the present invention, in any one of the first to third clothes dryers, the cool-down operation time before being extended by the operation time extension means is:
It is characterized in that it is determined based on the time required for the drying operation before the cool-down operation and the temperature detected by the temperature detecting means immediately before or immediately after the start of the cool-down operation.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first clothes dryer, during the cool-down operation period, the first temperature determining means determines that the detected temperature is equal to or less than the first specified value. Then, the operation control means determines that the temperature of the clothes in the drum has sufficiently decreased, and stops the drum rotation and air blowing even before the predetermined cool-down operation time has elapsed, and ends the cool-down operation. On the other hand, when the second temperature determining means determines that the detected temperature exceeds the second specified value during a period that is a predetermined time earlier than the end of the cool-down operation time, the operating time extending means: It is determined that the temperature of the clothes in the drum is not sufficiently lowered, and the cool-down operation time is extended by a certain time. Therefore, even when the operation time elapses without determining that the detected temperature has exceeded the second specified value during a period that is a predetermined time earlier than the end point of the cool-down operation time, the operation control means continues to operate the drum. The rotation and the blowing are stopped, and the cool-down operation ends.

Since the second specified value is appropriately set higher than the first specified value, the temperature of the clothes in the drum is still lower than the second specified value just before the end of the cool-down operation. Is too high, the cool down operation time is extended and unheated air is pumped into the drum to facilitate cooling of the garment.

Therefore, according to the first clothes dryer,
For example, when the temperature in the drum decreases slowly due to a high ambient temperature of the clothes dryer or the like, the cool-down operation is performed for a longer time than the initially set operation time. The temperature of the clothing can be reliably reduced, and high safety can be secured. Further, when the temperature in the drum falls in a short time, the operation is terminated even before the predetermined cool-down operation time has elapsed, so that the operation time does not needlessly prolong.

Since the temperature distribution of the air detected by the temperature detecting means is not always stable and uniform, the instantaneous value of the detected temperature does not always accurately reflect the temperature of the clothes in the drum. Absent. Therefore, in the second clothes dryer, the determination is made more accurately by determining whether or not the detected temperature exceeds the second specified value continuously for a predetermined time. . Therefore, it is possible to prevent the operation time from being unnecessarily prolonged.

Further, in the above-mentioned clothes dryer, after the cool-down operation time is once extended, the detected temperature exceeds the second specified value during a period that is a predetermined time before the end of the extended cool-down operation time. If it is determined that there is, the cool-down operation time is extended again. However, for example, when the ambient temperature is abnormally high, the temperature in the drum does not drop below a certain level, and if the operation time is extended without limitation,
It can happen that the operation does not end.

In the third clothes dryer, the number of times of extension of the cool-down operation time is limited. Therefore, when the temperature in the drum does not drop below a certain value due to abnormally high ambient temperature or the like. Driving is aborted. For this reason, it is possible to avoid a state where the operation is not completed forever.

In general, when the drying operation requires a long time, it can be estimated that cooling is difficult because the amount of clothes stored in the drum is large and the heat capacity is large. Therefore, in the fourth clothes dryer, if it is expected that it will take time to lower the temperature to the first or second specified value depending on the time required for the drying operation and the detected temperature, the initial cooling is performed. Set a longer down operation time. This allows
Unnecessarily prolonged operation time can be avoided.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a clothes dryer according to the present invention will be described below with reference to the drawings. First, the overall configuration of the clothes dryer will be described with reference to the side sectional view of FIG. A clothes input port 3 is provided at the center of the front of the machine frame 2 of the clothes dryer 1, and its opening is opened and closed by a door 4. A rear plate 5 is fixed to the back of the machine casing 2, and an intake port 6 for external air is formed substantially in the center of the rear plate 5. On the other hand, an air outlet 7 for air is formed on the lower surface of the machine casing 2. In the machine frame 2, an annular sheet metal drum support plate 8 is attached so as to surround the clothes input port 3, and a support plate 9 is erected at a rear portion in a lateral direction with a predetermined interval from the rear plate 5. I have. A partly cut-out fan casing 10 is fixed to the support plate 9, so that the inside of the machine frame 2 is divided into a fan chamber 11 and a drum accommodating chamber 12.

A drum 13 of a horizontal axis type is supported in the drum accommodating chamber 12 by a drum support plate 8 via felt or the like with its front opening facing the clothes input port 3. It is rotatably supported. Drum 13
Air outlet 1 covered with a lint filter 16
5, while an air inlet 17 is formed below the drum support plate 8 on the front side. The support plate 9 is provided with a communication port 18 for communicating the drum chamber 12 and the fan chamber 11, and the air flow from the air outlet 15 is reliably formed in the communication port 18.
The seal member 19 is attached between the drum 13 and the support plate 9 so as to reach.

In the fan chamber 11, a disc-shaped double-sided synthetic resin fan 20 is fixed to the main shaft 14, and a circulation fan 20a located on the drum housing chamber 12 side and a cooling fan 20b located on the rear panel 5 side. Are radially and integrally formed on both sides. A partition 21 is provided in the fan casing 10 so as to surround the double-sided fan 20. The double-sided fan 20 and the partition 21 are combined to accommodate the fan chamber by accommodating the double-sided fan 20 in a substantially central circular opening of the partition 21. 11 is divided into a drying air passage 22 and a cooling air passage 23. On the periphery of the double-sided fan 20, a concentric rotating groove that opens toward the drying air passage 22 is integrally formed.
A concentric fixing groove that opens toward the cooling air passage 23 is formed on the inner peripheral edge of the partition 21, and the rotating groove of the double-sided fan 20 and the fixing groove of the partition 21 are loosely fitted in a non-contact state with each other. ing. That is, the rotating groove of the double-sided fan 20 and the partition 21
The labyrinth connection is formed with the fixing groove. For this reason,
Air cannot be exchanged between the drying air passage 22 and the cooling air passage 23.

A lower portion of the drying air passage 22 and an air inlet 17 formed in the drum support plate 8 are connected by a drying duct 24, and a heater 25 is arranged near the air inlet 17 inside the drying duct 24. I have. The heater 25 is formed of, for example, a honeycomb-shaped positive temperature coefficient thermistor. At the lowermost part of the drying duct 24, a drain port 26 for discharging the dehumidified water condensed in the drying duct 24 to the outside of the machine is provided.

A motor 27 is provided at the bottom of the machine casing 2. The motor 27 applies a rotational force to a V-belt 32 wound around the outer peripheral surface of the drum 13 via a pulley 31, and a pulley 28 formed at the center of the cooling fan 20 b via a pulley 28 and a fan belt 29. Giving rotational force. Further, in order to prevent the V-belt 32 from slipping, the idler pulley 33 is driven by the V-belt 32 during rotation of the drum.
Apply appropriate tension to A rotation sensor 34 for detecting the number of rotations of the motor 27 is attached to the pulley 28.

During the drying operation, the drum 13 is driven at a low speed by the rotational driving force of the
Are rotated at high speed, and at the same time, the heater 25 is energized to heat the drying air. Thereby, the circulation fan 20
The wind generated by the rotation of a is the drying air path 22, the drying duct 2
4. Circulates through the drum 13 and removes moisture from clothing as hot air passes through the drum 13. On the other hand, cooling fan 2
By the rotation of Ob, outside air is introduced into the cooling air passage 23 from the intake port 6 and discharged from the exhaust port 7. At this time, the double-sided fan 20 itself is cooled by the cool air. The hot air containing moisture after passing through the drum 13 contacts the double-sided fan 20 and is cooled, and condensed water flows down the inner wall of the drying air passage 22 and is discharged from the drain port 26.

An outlet temperature sensor 35 for detecting the temperature of air exhausted from the drum 13 is disposed near the air outlet 15 of the drum 13. Outlet temperature sensor 3
Numeral 5 is composed of a thermosensitive element such as a thermistor. An operation panel 36 provided with various input keys and a display is provided below the front of the machine casing 2. A synthetic resin substrate case 37 is attached to the inside of the machine casing 2 behind the operation panel 36 with screws, and the substrate case 37 is a member having a large heat capacity that is not easily affected by a sudden change in ambient temperature. A control board 38 composed of On the control board 38, a microcomputer (hereinafter referred to as "microcomputer") described later, an atmosphere temperature sensor 39 for detecting the temperature of the control board 38 itself, and other various electric components are mounted.

FIG. 2 is a diagram showing an electric system configuration of the clothes dryer 1. As shown in FIG. CPU51, ROM5 at the center of control
2. A microcomputer 50 including a RAM 53, a timer 54, an A / D converter 55, and the like is provided, and a drying operation is executed by controlling each unit described below according to an operation program stored in the ROM 52 in advance. The microcomputer 50 includes an input key circuit 6 including input keys of the operation panel 36.
0, a door switch 61 for detecting opening and closing of the door 4, an LED lighting circuit 62 for driving an LED provided on the operation panel 36, an exit temperature sensor 35, an ambient temperature sensor 39, a rotation speed detection circuit 63 including a rotation sensor 34, A buzzer circuit 64 for driving an electronic buzzer, a power supply circuit 65 connected to a commercial power supply, a commercial power supply zero-cross signal detection circuit 66 for detecting a zero-cross point of the commercial power supply, a motor 27, a heater 25, and automatically after the drying operation is completed. A load drive circuit 68 for driving an auto power off circuit (APO) 67 for interrupting power supply, a clock oscillation circuit 69 for generating a master clock signal, a reset circuit 70, and a current detection circuit 71 are connected. I have.

FIG. 3 is a flow chart showing the flow of the entire process of the drying operation of the clothes dryer 1 of the present embodiment, focusing on the control operation of the microcomputer 50. As shown in FIG. 3, when the power key on the operation panel 36 is turned on (step S1), the microcomputer 50 receives the reset signal from the reset circuit 70 and executes the initial setting (step S1).
2) This resets various flags and variables. When the user puts the clothes in the drum 13 and presses the start key (step S3), the drying operation is started. That is, first, the microcomputer 50 turns on the motor 27.
Then, the motor 27 is started with the initial target rotation speed set to, for example, 1250 rpm (step S4). As a result, the rotation speed of the motor 27 rapidly increases to the target rotation speed, and the drum 13 and the double-sided fan 20 rotate at a predetermined rotation speed (for example, the drum 13
Rotate at about 41 rpm, and the double-sided fan 20 rotates at about 810 rpm.

Next, the microcomputer 50 determines the ON / OFF state of the heater 25 according to the temperature condition or the like, and executes a heater control process for energizing the heater 25 in accordance with the ON / OFF state (step S5). Further, the microcomputer 50 performs a rotation control process of the motor 27 (Step S6). In particular,
The microcomputer 50 receives a signal of an analog value proportional to the power supply current including the motor 27 and the heater 25 detected by the current detection circuit 71, converts the signal into a digital value by the A / D converter 55, and converts this into a predetermined value. Motor 2
7 is corrected. When a positive temperature coefficient thermistor is used for the heater 25, the current flowing through the heater 25 increases when the rotation speed of the double-sided fan 20 is high and the air flow rate is large, and the current flowing through the heater 25 decreases when the air flow rate is small. Therefore, by adjusting the rotation speed of the motor 27 as described above, the power supply current is prevented from flowing excessively.

After controlling the heater 25 and the motor 27, the microcomputer 50 determines whether or not the drying operation has been completed (step S7). If not, the microcomputer 50 returns to step S4 and returns to step S4. The processing of S4 to S7 is repeatedly executed.

FIG. 5A shows the outlet temperature T1 detected by the outlet temperature sensor 35 in the clothes dryer of the present embodiment.
And the substrate temperature T detected by the ambient temperature sensor 39.
FIG. 2 is a diagram showing a change in the drying operation time of No. 2; When the drying operation is performed as described above, the outlet temperature T1 changes as shown by a curve L1. That is, in the preheating period [i], the outlet temperature T1 gradually rises because the given amount of heat is used to increase the temperature of the dryer main body and the clothes containing much moisture. Subsequent constant rate drying period [ii]
In this case, since most of the applied heat is used to evaporate the moisture in the clothes, the outlet temperature T1 is kept almost constant. In the reduced-rate drying period [iii], the supplied heat is consumed not only for evaporation of the water but also for the temperature rise of the clothes itself or the body of the dryer in which the water has been reduced, so that the outlet temperature T1 rises again.

On the other hand, the substrate temperature T2 changes as shown by a curve L2. That is, the substrate temperature T2 gradually rises for a while after the start of the operation, and changes to a substantially constant level after a certain period of time. This is because the control board 38 to which the ambient temperature sensor 39 is attached is a member having a large heat capacity which is affected by the ambient temperature itself but is not easily affected by the rapid change. This is because it almost depends on heat radiation of each electric component mounted on the board 38.

Therefore, the temperature difference T between the outlet temperature T1 and the substrate temperature T2 changes as shown by a curve L3 in FIG. That is, the temperature rises slowly at first, and the preheating period [i]
, Gradually decreases after reaching the maximum near the end of, and then remains almost constant. Then, the lapse rate drying period [ii
In i), the temperature difference T gradually increases as the outlet temperature T1 increases.

The end of the drying operation in step S7 is determined, for example, when the temperature difference T reaches a predetermined value Tb, when a predetermined drying operation time has elapsed, or when the outlet temperature T1 has reached a predetermined temperature. After reaching Ta (for example, 80 ° C.), the temperature is maintained substantially constant by ON / OFF control of the heater 25, and when the predetermined time elapses, this is performed. After the end of the drying operation, a cool-down operation described below is continuously performed (step S
8) If the cool-down operation is completed (step S
9) Turn off the motor 27 and end all the processing.

Next, the control processing of the cool-down operation in step S8 will be described in detail with reference to the flowchart of FIG. When the cool-down operation is started, the microcomputer 50 turns off the heater 25 and keeps the motor 27 on (step S10). Then, the microcomputer 50 determines a cool-down operation time (Step S11).
That is, using the drum outlet temperature T1 and the drying operation time t1 as parameters, a cool-down operation time is selected from a table as shown in FIG. Such a table is stored in the ROM 52 in advance. Here, the drying operation time t1 is a required time ta from when the drying operation is started to when the drum outlet temperature T1 reaches a predetermined temperature Ta (for example, 80 ° C.), or until the temperature difference T reaches a predetermined value Tb. For the shorter required time t of the required time tb, t1 = 0 minutes when the required time t is less than 30 minutes, and t1 = 30 minutes, 60 minutes or more when the required time t is 30 minutes or more and less than 60 minutes. If less than 90 minutes, t1 = 60 minutes, if more than 90 minutes, t1
= 90 minutes.

When the required time t is long, it is considered that the heat capacity is large, for example, the amount of clothes in the drum 13 is large. In such a case, it can be determined that it takes a longer time to cool the clothes, so the cool-down operation time is set long in advance. Further, even when the drum outlet temperature T1 is high at the beginning of the cool-down operation, it can be determined that a longer time is required to cool the clothes, so the cool-down operation time is set to be long in advance. When the cool-down operation time is set in the operation time timer included in the timer 54, time measurement is started (step S12).

Next, the microcomputer 50 determines the drum outlet temperature T
It is determined whether or not 1 is lower than 40 ° C. (step S1)
3). If it is determined that the outlet temperature T1 has not fallen below 40 ° C., the 10-second timer (10
Reset the timer that counts seconds (step S
17) It is determined whether or not the remaining time of the operation time timer is within one minute (step S18). If it is determined that the remaining time exceeds one minute, the process returns to step S13, and it is determined again whether the drum outlet temperature T1 is less than 40 ° C. If it is determined in step S18 that the remaining time is within one minute, then the drum outlet temperature T1 is set to 50 ° C.
Is determined (step S19). If it is determined that the outlet temperature T1 exceeds 50 ° C., 10
The timer of the second timer is started (step S20), and it is determined whether or not the timer of the 10-second timer has ended (step S20).
21). If the time measurement has not ended, it is determined whether or not the operation time timer has ended (step S2).
6).

If it is determined in step S26 that the counting of the operation time timer has not ended, the process returns to step 19. On the other hand, in step S19, the outlet temperature T1 is 5
If it is determined that the temperature is equal to or lower than 0 ° C., after resetting the 10-second timer (step S25), it is determined whether or not the counting of the operation time timer is completed (step S26). Therefore, when it is determined in step S21 that the counting of the 10-second timer has ended, it means that the state in which the drum outlet temperature T1 has exceeded 50 ° C. has continued for 10 seconds. In this case, the cool-down operation time is extended by 3 minutes by adding 3 minutes to the remaining time of the operation time timer (step S22). Then, the extension number counter value C is incremented by 1 (step S23), and it is determined whether or not the counter value C is 8 or less (step S24). The counter value C has been reset to zero at the time of the initial setting of the step S2 or at an appropriate time thereafter. When it is determined in step S24 that the count value C is 8 or less, the process returns to step S13. Therefore, the operation time is extended up to eight times as described above, and the count value C becomes 9
If so, the process proceeds from step S24 to S16 to turn off the motor 27 and end the operation.

In step S13, the drum outlet temperature T
If it is determined that 1 is lower than 40 ° C., the counting of the 10-second timer is started (step S14), and it is determined whether or not the counting of the 10-second timer is completed (step S15). If the timing has not ended, the process returns to step S13.
Therefore, it is determined in step S15 that the time measurement has ended when the state where the outlet temperature T1 is less than 40 ° C. has continued for 10 seconds. At this time, since it can be determined that the temperature of the clothes in the drum 13 has sufficiently decreased, the process proceeds to step S16, in which the motor 27 is turned off and the operation ends.

As described above, in the clothes dryer of this embodiment, (1) when the drum outlet temperature T1 is continuously lower than 40 ° C. for 10 seconds (that is, in step S13 → S1 in FIG. 4).
4 → S15 → S16) or
(2) When the operation time ends without the drum outlet temperature T1 continuously exceeding 50 ° C. for 10 seconds within one minute after the end of the cool-down operation time (that is, steps S19 → S25 in FIG. 4). If the process proceeds from step S26 to step S16), it is determined that the temperature of the clothes in the drum 13 has been sufficiently lowered, and the cool-down operation ends.

(3) Since the drum outlet temperature T1 continuously exceeded 50 ° C. for 10 seconds within one minute after the end of the cool-down operation time, the operation time was extended by three minutes, and this was extended eight times. When repeated (that is, step S in FIG. 4)
(When the processing proceeds from 22 to S23 to S24 to S16), it is determined that the temperature does not decrease even if the cool-down operation is continued further, depending on the conditions such as the ambient temperature, and the cool-down operation ends.

The numerical values in the above embodiment are merely examples, and the present invention is not limited to these numerical values. The above embodiment is merely an example, and it is apparent that modifications and modifications can be made as appropriate within the scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a side longitudinal sectional view of a clothes dryer according to an embodiment of the present invention.

FIG. 2 is an electric configuration diagram of the clothes dryer.

FIG. 3 is a flowchart of a process of the entire drying operation in the clothes dryer.

FIG. 4 is a flowchart of a cool-down operation process in the clothes dryer.

FIG. 5 is a diagram showing changes in outlet temperature and substrate temperature with respect to operation time during a drying operation.

FIG. 6 is a diagram illustrating an example of a table used when determining a cool-down operation time.

[Explanation of symbols]

 13: drum 25: heater 27: motor 35: outlet temperature sensor 39: ambient temperature sensor 50: microcomputer 68: load drive circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Fukuda 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Akito Shimamoto 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5-5 in Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A drying operation in which heated air is sent to a drum containing clothes to cool and dehumidify the air passing through the drum and then circulate the drying air, and then the rotation of the drum is continued to generate the cold air. In a clothes dryer that performs a cool-down operation of feeding into a drum, a) a temperature detection unit that detects a temperature of air immediately after passing through the drum, and b) a temperature detected by the temperature detection unit during the cool-down operation is the third temperature. First temperature determining means for determining whether the temperature is equal to or less than a prescribed value of 1; c) the temperature detected by the temperature detecting means during the period preceding the end of the cool-down operation time by a predetermined time; A second temperature determining means for determining whether or not the temperature exceeds a second specified value higher than the specified value; d) if the detected temperature exceeds the second specified value by the second temperature determining means; Coolda when judged Operating time extending means for extending the operating time; e) when the first temperature determining means determines that the detected temperature is equal to or less than a first specified value, or when a predetermined cool-down operating time has elapsed. And an operation control means for ending the cool-down operation. 2. The temperature control device according to claim 2, wherein the temperature detected by the temperature detecting means continuously exceeds a second specified value for a predetermined time during a period that is a predetermined time before the end of the cool-down operation time. The clothes dryer according to claim 1, wherein it is determined whether or not the clothes are present. 3. The clothes dryer according to claim 1, wherein the operation time extending means limits the extension operation of the cool down operation time to a predetermined number of times. 4. The cooling down operation time before being extended by the operation time extending means includes a time required for a drying operation before the cooling down operation and a temperature detected by the temperature detecting means immediately before or immediately after the start of the cooling down operation. The clothes dryer according to any one of claims 1 to 3, wherein the clothes dryer is determined based on: