JPH08332300A - Clothes drier - Google Patents

Abstract

PURPOSE: To complete drying in the optimum drying time in response to the quantity of clothes and the wet degree regardless of the quantity of the clothes even when the temperature of the operating environment is high in a clothes drier feeding hot air into a rotary drum rotatively driven by a motor to dry the clothes. CONSTITUTION: A rotary drum and a heat exchange type double-vane fan are rotatively driven. A draft path to the rotary drum is provided with a PTC heater 3, the first thermistor 6 detecting the temperature the air before it is heat-exchanged by the heat exchange type double-vane fan, and the second thermistor 7 detecting the temperature of the air before it is sucked by the PTC heater 3 after it is heat-exchanged by the heat exchange type double-vane fan. A control means 9 receives the temperature data of the first thermistor 6 and the second thermistor 7 and completes the drying operation based on the change quantity of the maximum value or the minimum value of the temperature of the suction air during the residual drying period after a temperature regulator is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clothes dryer for sending warm air into a rotary drum which is driven by a motor to dry clothes.

[0002]

2. Description of the Related Art In recent years, household clothes dryers have become widespread, and it is required that they can be dried without unevenness in drying regardless of the kind of material to be dried.

Conventionally, this kind of clothes dryer circulates warm air in a rotary drum for drying clothes and detects exhaust temperature of the rotary drum, an internal temperature of the rotary drum and an intake temperature of the heating means. And a temperature difference detection means for detecting the temperature difference of the
When the rate of change in the temperature difference obtained by the temperature difference detecting means becomes equal to or greater than a predetermined value, the remaining drying time is generally set to a predetermined value. It should be noted that in FIG. 14, a curve a shows the temperature detected by the exhaust gas temperature detecting means, and a curve b shows the intake air temperature.

However, when the amount of clothes in the rotating drum is small, or when the clothes are large in capacity and dried, as shown in FIG. 15, the temperature in the rotating drum tends to become high, and the clothes are damaged by the heat. Predetermined temperature Tx to prevent the increase
When it reaches, as shown in a period T1 of FIG. 15, the heating means is stopped and controlled until the temperature falls below a predetermined temperature Ty.
In this case, since it is difficult to judge the remaining drying operation time from the reduced rate drying state as shown in FIG. 14, the time ta and the temperature control cycle at the time of temperature adjustment (hereinafter referred to as temperature adjustment) operation are generated as shown in FIG. It was general to set the remaining drying time by (T1 + T2).

[0005]

In such a conventional clothes dryer, the temperature control becomes easy to work when the environment temperature is high, and even if a lot of clothes are put in such a case, the clothes are dried sufficiently. As described above, since the drying operation time after the temperature control has to be set long, there is a problem that the drying time becomes too long when the amount of clothes is small.

The present invention solves the above-mentioned problems, and it is possible to finish the drying time in an optimum manner according to the amount of clothes and the degree of wetness, regardless of the amount of clothes, even when the environment temperature is high. It is an object.

[0007]

In order to achieve the above object, the present invention has a rotating drum for drying clothes, a blowing means for sending warm air into the rotating drum, and an air blowing into the rotating drum. Heating means provided in the path, a motor for rotationally driving the blower means or the rotating drum, an exhaust temperature detecting means for detecting an internal temperature of the rotating drum, and an intake temperature detecting means for detecting an intake temperature of the heating means. A control means for controlling the drying operation by inputting the exhaust gas temperature detected by the exhaust gas temperature detection means and the intake air temperature detected by the intake air temperature detection means, wherein the control means has an exhaust gas temperature of a predetermined temperature. The first problem solving means is to finish the drying by the amount of change of the maximum value or the minimum value of the intake air temperature during the remaining drying time after reaching the temperature.

Further, a rotating drum for drying clothes, an air blowing means for sending warm air into the rotating drum, a heating means provided in an air blowing path into the rotating drum, the air blowing means or the rotating drum. A motor for rotationally driving, an exhaust temperature detecting means for detecting the temperature inside the rotating drum, and an intake temperature detecting means for detecting an intake temperature of the heating means,
The exhaust gas temperature detected by the exhaust gas temperature detection means and the intake air temperature detected by the intake air temperature detection means are input to control means for controlling the drying operation. A second problem-solving means is that the remaining drying time after the end of the drying is finished during the operation depending on the amount of change in the intake air temperature at every predetermined timing.

In addition to the second problem-solving means, the heating means is divided into a plurality of parts, and a switching means for turning on / off each heating means is provided, and the control means sets a predetermined time when the exhaust gas temperature reaches a predetermined temperature. Thirdly, the intake air temperature is measured as a timing, and at least one of the heating means is turned off by the switching means.
Is used as a means for solving the problem.

Further, a rotating drum for drying clothes, a blowing means for sending warm air into the rotating drum, a heating means provided in a blowing path into the rotating drum, the blowing means or the rotating drum. A motor for rotationally driving, an exhaust temperature detecting means for detecting the temperature inside the rotating drum, and an intake temperature detecting means for detecting an intake temperature of the heating means,
The exhaust gas temperature detected by the exhaust gas temperature detection means and the intake air temperature detected by the intake air temperature detection means are input to control means for controlling the drying operation. A fourth problem solving means is that the drying is finished when the exhaust gas temperature reaches a predetermined temperature plus a predetermined value or more during the remaining dry time after reaching the predetermined time.

In the first, second or fourth problem solving means, the control means is set by the temperature difference between the exhaust temperature and the intake temperature and the operating time when the exhaust temperature reaches a predetermined temperature. A fifth problem solving means is that the total time of the delay time and the correction time set by the temperature difference after the delay time is set as the remaining drying time.

In addition to the fourth means for solving the problem, an ambient temperature detecting means for detecting the ambient temperature is provided, and the control means inputs the ambient temperature detected by the ambient temperature detecting means to obtain the ambient temperature. The sixth problem solving means is that the predetermined value is corrected by.

[0013]

According to the first means for solving the above problems, the present invention provides:
Even when the operating environment temperature is high, the drying operation is performed when the change in intake air temperature is detected during operation for the remaining drying time set after the temperature control works and the change in the maximum or minimum value disappears. Since it is finished, it is possible to finish in an optimal drying time according to the amount of clothes and the degree of wetness.

Further, according to the second means for solving the problem, even when the use environment temperature is high, the intake air temperature does not change at every predetermined timing during the remaining drying time set after the temperature control works. Since the drying operation is terminated when the dry state is reached, it is possible to complete the dry period optimally according to the amount of clothes and the degree of wetness without a complicated algorithm for detecting the maximum value or the minimum value.

Further, according to the third problem solving means, at least one of the heating means divided into a plurality is turned off each time temperature control works, and the intake air temperature at that time is measured, and when the change disappears. Since the drying operation is ended, the intake air temperature becomes a value close to the maximum value at the timing when the temperature control works and the heating means is turned off, and it is possible to detect a highly accurate change in the maximum value by a simple method.

Further, by the fourth means for solving the problem, the clothes are dried, and the temperature of the clothes is controlled to increase the amount of overshoot in which the exhaust temperature continues to rise even if the heating means is turned off. Even when the temperature is high,
While operating the remaining drying time set after the temperature control works,
When the exhaust gas temperature is equal to or higher than the predetermined temperature plus the predetermined value, the drying operation is ended, so that the drying time can be ended in an optimum drying time according to the amount of clothes and the degree of wetness.

According to the fifth means for solving the problems, the delay time set by the temperature difference between the exhaust gas temperature and the intake air temperature when the temperature control first works and the operating time, and the temperature difference after the delay time elapses. By making the total time with the correction time set by the remaining drying time set after the temperature control works, even if it becomes impossible to accurately grasp the change of the maximum value or the minimum value of the intake air temperature. , A small amount of clothes does not take too long to dry, and a large amount of clothes does not become undried.

Further, according to the sixth means for solving the problems, the overshoot amount for ending the drying operation can be corrected by the ambient temperature during the operation of the remaining drying time set after the temperature control works. The optimum drying time can be completed depending on the amount of clothes and the degree of wetness regardless of the ambient temperature.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 2, the rotary drum 1 is for accommodating and drying an object to be dried (clothes), and warm air is circulated in the rotary drum 1 by a heat exchange type double-blade fan (blowing means) 2. Let The heat exchange type double-blade fan 2 circulates warm air in the rotary drum 1 and at the same time takes in air from the outside to cool the fan and dehumidify the circulating air in the rotary drum 1. The PTC heater (heating means) 3 is arranged in the air blowing path to the rotary drum 1, that is, in the circulating air intake, and heats the circulating air.

The filter 4 is provided in the air blowing path of the heat exchange type double-blade fan 2, that is, in the air outlet of the rotary drum 1 so as to collect the thread waste in the circulating air.
The motor 5 rotationally drives the rotary drum 1 and the heat exchange type double-blade fan 2. First thermistor (exhaust gas temperature detecting means) 6
Is for detecting the air temperature before heat exchange by the heat exchange type double-blade fan 2, and the second thermistor (intake air temperature detecting means) 7 is P after heat exchange by the heat exchange type double-blade fan 2.
The temperature of the air before being taken into the TC heater 3 is detected.

Next, as shown in FIG. 1, the ambient temperature detecting means 8 detects the ambient temperature used from the temperature data of the first thermistor 6 and the temperature data of the second thermistor 7. The control means 9 inputs the temperature data from the first thermistor 6 and the second thermistor 7 and the ambient temperature detected by the ambient temperature detecting means 8, and when the temperature control works, as shown in FIG. (Time at which the temperature of the first thermistor 6 reaches Tx), the time from the start of operation (ton)
Based on the temperature difference (Tson) between the first thermistor 6 and the second thermistor 7, an optimum delay time (td) is set according to the amount of clothes and the degree of wetness, and the temperature difference during the delay time is set. Of the maximum value (Tsmax) of the correction time (th, th = 0)
~ ~ Several tens of minutes).

Further, the control means 9 has P divided into two parts.
One of the TC heaters 3 is a heater 3a and the other is a heater 3b, and relays 10a and 10b connected in series to the TC heater 3 and the heater 3a, respectively.
Then, the drying operation is controlled while controlling the motor drive element 11 for driving the motor 5. Ambient temperature detection means 8,
The control means 9 can be easily realized by the microcomputer 12. In addition, 13 is a power switch, and
4 is a commercial power source.

Further, the control means 9 changes the maximum value or the minimum value of the temperature of the second thermistor 7 during the remaining drying time after the temperature of the first thermistor 6 reaches a predetermined temperature. I am trying to finish drying.

The operation of the above configuration will be described with reference to FIGS. 4 and 5. FIG. 4 shows the operation when the drying operation is terminated when the temperature control is performed during the drying operation. First, the operation is started in step 40, the initialization is performed in step 41, the motor 5 is turned on in step 42, and the rotary drum 1 and the heat exchange type double-blade fan 2 are rotationally driven. After a delay of 20 seconds in step 43, room temperature (ambient temperature) is detected in step 44, and the detected room temperature is defined as Ta. The method of detecting the room temperature will be described later.

Then, in steps 45 to 47, the relay 10a is turned on to energize the heater 3a,
After a delay of 0 second, the relay 10b is turned on to energize the heater 3b. In step 48, it is determined whether or not the temperature has been adjusted, that is, the temperature detected by the first thermistor 6 has reached a predetermined value (for example, 68 ° C.) or more.
Then, it is determined whether or not 5 hours have elapsed from the start of operation. If it has not elapsed, the process returns to step 48, and if it has elapsed, the process goes to step 56 to end the drying operation.

If there is temperature control in step 48, step 5
The delay time td is set to 0, the timer 1 is cleared, and the temperature of the second thermistor 7 at that time is set to T2po as the initial value of the maximum value. Here, the delay time td
Is an optimum delay time according to the amount of clothes and the degree of wetness, based on the time from the start of operation and the temperature difference between the temperature of the first thermistor 6 and the temperature of the second thermistor 7. In steps 51 to 52, the temperature of the second thermistor 7 is input, and if the temperature is the maximum value, it is set to T2pn, and if it is not the maximum value, the process proceeds to step 55.

In step 53, it is judged whether or not the change from the previous maximum value T2po has become less than or equal to a predetermined value TC1, and if the change in maximum value is less than or equal to TC1, step 5
Go to 6 and finish the drying operation. If the change in the maximum value exceeds TC1, go to step 54 and change the value of T2pn to T2po.
Replace. In step 55, it is judged whether or not the time measured by the timer 1 has reached the delay time td, and if it has reached, the drying operation is terminated, and if it has not reached, it returns to step 51 to detect a new maximum value. To

Although FIG. 4 shows a method of ending the drying operation when the maximum value changes, when the drying operation is ended when the minimum value changes, the temperature of the second thermistor 7 in step 51 is input. Then, when it is determined whether the temperature is the maximum value, it may be determined whether the temperature is the minimum value.

FIG. 5 shows the temperature TH1 of the first thermistor 6 until the end of the drying operation when the temperature control is performed during the drying operation,
It shows the change over time of the temperature TH2 of the second thermistor 7. Here, ton is the time from the start of operation to the time when temperature control works, and in general, when the clothes in the rotary drum 1 have dried, that is, immediately before the end of the drying operation, the heat capacity in the rotary drum 1 becomes small, The temperature of the first thermistor 6 is TH1
Has a large overshoot from the controlled temperature Tx,
The temperature TH2 of the second thermistor 7 decreases, but the change is saturated after the clothes are completely dried. Where the first
When the temperature TH1 of the thermistor 6 becomes equal to or higher than Tx, either of the heaters 3a and 3b is turned off, and when the temperature becomes equal to or lower than Ty, both heaters are turned on.

In FIG. 5, when the maximum value of the temperature TH2 of the second thermistor 7 after the temperature control is plotted, it is M
1, M2, M3 ... M7, from M1 to M2 and M2
From M6 to M3 gradually decrease, but from M6 to M7, there is almost no change, so that the change is regarded as saturated, and the drying operation is ended there. Further, when the minimum value of the temperature TH2 of the second thermistor 7 is plotted, N1,
N2, N3 ... N6, and there is almost no change from N5 to N6, so it is considered that the change is saturated and the drying operation may be ended there.

Next, a second embodiment of the present invention will be described. The control means 9 in FIG. 1 controls whether the heater 3a and the heater 3b are both turned on by the temperature control during the remaining drying time after the temperature of the first thermistor 6 reaches a predetermined temperature, and one of them is turned off. When the state (2) is reached (predetermined timing), the drying is completed depending on the amount of change in the temperature of the second thermistor 7. The other structure is the same as that of the first embodiment.

The operation of the above configuration will be described with reference to FIGS. 6 and 7. FIG. 6 shows an operation when the drying operation is terminated when the temperature control is performed during the drying operation. In FIG. 6, step 60 to step 69
The steps up to are the same as steps 40 to 49 in FIG. If the temperature is adjusted in step 68, the delay time td is set in step 70, the timer 1 is cleared, and the temperature T of the second thermistor 7 is further increased.
As an initial value for detecting a change in H2, the temperature TH2 of the second thermistor 7 at that time is T2o. Here, the delay time td is the time from the start of operation, the temperature TH1 of the first thermistor 6 and the temperature T of the second thermistor 7.
It is the optimum delay time according to the amount of clothes and the degree of wetness based on the temperature difference of H2.

From step 71 to step 72, when either one of the heater 3a and the heater 3b is turned on by the temperature control to be turned off, the temperature TH2 of the second thermistor 7 at that time is changed. The temperature is T2n,
Otherwise, skip to step 75. In step 73, it is determined whether or not the change from the previous value T2o has become less than or equal to a predetermined value TC2. If the change in the temperature TH2 of the second thermistor 7 is less than or equal to TC2, go to step 76 and carry out the dry operation. To finish.

If the change in the temperature TH2 of the second thermistor 7 exceeds TC2, the value of T2n is replaced with T2o in step 74. In step 75, it is judged whether or not the time measured by the timer 1 has reached the delay time td,
If it has reached, the drying operation is ended, and if it has not reached, it returns to step 71 and continues the drying operation.

FIG. 7 shows the temperature TH1 of the first thermistor 6 until the end of the drying operation when the temperature control is performed during the drying operation,
It shows the change over time of the temperature TH2 of the second thermistor 7. The characteristics of the changes over time of the temperature TH1 of the first thermistor 6 and the temperature TH2 of the second thermistor 7 are the same as in the case of FIG.

In FIG. 7, the temperature TH2 of the second thermistor 7 when both the heater 3a and the heater 3b are in the on state and the heater 3a and the heater 3b are in the off state is plotted. P2, P3 ... P7. The temperature TH1 of the first thermistor 6 or the temperature TH2 of the second thermistor 7 reaches a maximum with a slight delay from the moment when two heaters are turned on from one turned off. This is due to the slowness and the delay due to the heat capacity of the thermistor itself. Therefore, from P1 to P2
And P2 to P3 gradually decrease, but there is almost no change from P6 to P7, and it is considered that the change is saturated, and the drying operation is ended there.

Next, a third embodiment of the present invention will be described. When the temperature of the first thermistor 6 exceeds a predetermined temperature plus a predetermined value during the remaining drying time after the temperature of the first thermistor 6 reaches the predetermined temperature, the control means 9 in FIG. I am trying to. The other structure is the same as that of the first embodiment.

The operation of the above configuration will be described with reference to FIGS. 8 and 9. FIG. 8 shows the operation when the drying operation is terminated when the temperature control is performed during the drying operation. In FIG. 8, steps 80 to 89
The steps up to are the same as steps 40 to 49 in FIG. If there is temperature control in step 88, the delay time td is set in step 90 and the timer 1 is cleared. Here, the delay time td is an optimum delay time according to the amount of clothes and the degree of wetness based on the time from the start of operation and the temperature difference between the temperature TH1 of the first thermistor 6 and the temperature TH2 of the second thermistor 7. Is.

Subsequently, in step 91, it is judged whether or not the temperature TH1 of the first thermistor 6 is equal to or higher than the temperature control temperature Tx + α (predetermined predetermined value), and if the condition is satisfied, the clothes are dried. Step 93
Go to the end of the drying operation. If the condition is not satisfied, the routine proceeds to step 92, where it is judged whether or not the time measured by the timer 1 has reached the delay time td. If it has reached, the drying operation is terminated, and if it has not reached, the routine returns to step 91. Try to continue the dry operation.

FIG. 9 shows the temperature TH1 of the first thermistor 6 until the end of the drying operation when the temperature control works during the drying operation,
It shows the change over time of the temperature TH2 of the second thermistor 7. The characteristics of the changes over time of the temperature TH1 of the first thermistor 6 and the temperature TH2 of the second thermistor 7 are the same as in the case of FIG.

Next, a fourth embodiment of the present invention will be described. The control means 9 in FIG. 1 inputs the ambient temperature from the ambient temperature detection means 8 which detects the ambient temperature from the temperature data of the first thermistor 6 and the temperature data of the second thermistor 7, and the first thermistor. When the temperature of the first thermistor 6 becomes a predetermined temperature plus a predetermined value or more during the remaining drying time after the temperature of 6 reaches the predetermined temperature, the predetermined value at the end of drying is corrected by the ambient temperature. I am trying. The other structure is the same as that of the third embodiment.

The operation of detecting the room temperature (ambient temperature) in the above structure will be described with reference to FIG. FIG. 10 shows an example of a room temperature detection subroutine performed during the drying operation. First, in step 101, the temperatures detected by the first thermistor 6 and the second thermistor 7 are set to TH1i and TH2i, respectively. From step 102 to step 103, the temperature difference is 1.5K or less, and TH1i
Is below 35 ° C., and if the above conditions are satisfied, the routine proceeds to step 109, where TH2i is set to room temperature Ta, and the routine ends at step 110.

If the above conditions are not satisfied, the maximum time is set to t5 (for example, 5 minutes) from step 104 to step 106, the temperature difference is 1.5 K or less, and T
Blower operation is performed until H1i falls below 35 ° C. Then, in step 107, the temperatures detected by the first thermistor 6 and the second thermistor 7 are set to TH1e and TH2e, respectively, and in step 108, the room temperature Ta is obtained by the proportional calculation from TH1i, TH2i, TH1e, and TH2e, and ends in step 110. To do.

That is, when the operation is started in a state where the inside of the rotary drum 1 is cold, the temperature of the second thermistor 7 at the start of operation is set to the room temperature Ta, and when the operation is started in a warm state, Blower operation is performed for a maximum of 5 minutes, and the temperature TH1 of the first thermistor 6 and the second thermistor 7 during that period are
The room temperature Ta is calculated from the temperature gradient of the temperature TH2.

FIG. 11 shows the temperature TH of the first thermistor 6 after the operation is started with the inside of the rotary drum 1 being cold.
1 shows the change over time of the temperature TH2 of the second thermistor 7, and is an example in which the temperature TH2 of the second thermistor 7 at the start of operation is the room temperature Ta.

FIG. 12 shows the temperature T of the first thermistor 6 after the operation is started with the inside of the rotary drum 1 warmed.
H1 and the temperature TH2 of the second thermistor 7 are shown with time, and show the case where the air blowing operation is performed from the start of operation to time t5 and the drying operation is started from time t5. In the figure, a straight line connecting TH1i and TH1e and TH2i and TH
The temperature Tc at the intersection of the straight lines connecting 2e is easily obtained by proportional calculation, and the room temperature Ta is a value obtained by further subtracting ΔTc from Tc. ΔTc is a correction value peculiar to the aircraft, which is obtained by experiment.

FIG. 13 shows the changes over time in the temperature TH1 of the first thermistor 6 and the temperature TH2 of the second thermistor 7 since the operation was started with the inside of the rotary drum 1 warmed. There is a case in which the blowing operation is performed until the temperature TH1 of the first thermistor 6 and the temperature TH2 of the second thermistor 7 become equal to the room temperature Ta after the time t5 from the start of the operation. In this case, the room temperature Ta can be accurately obtained, but it is necessary for several tens of minutes, so that the total operation time from the start of operation to the end of the drying operation becomes too long and practically impossible.

In this way, the ambient temperature is detected, and the overshoot amount for ending the drying operation can be corrected by the ambient temperature during the remaining drying time set after the temperature control works. Thus, it is possible to finish in an optimum drying time according to the amount of clothes and the degree of wetness regardless of the ambient temperature.

In the present embodiment, the room temperature detection timing is set to 20 seconds after the start of operation, but it may be set immediately after the start of operation or for detecting the intake air temperature immediately before being heated by the PTC heater. Although the room temperature is detected by the thermistor, a thermistor for detecting the room temperature may be separately provided in the main body.

[0051]

As described above, according to the present invention, a rotating drum for drying clothes, an air blowing unit for sending warm air into the rotating drum, and a heating unit provided in an air blowing path into the rotating drum. A motor for rotating the blower means or the rotating drum, an exhaust temperature detecting means for detecting an internal temperature of the rotating drum, an intake temperature detecting means for detecting an intake temperature of the heating means, and an exhaust temperature detecting means. Control means for controlling the drying operation by inputting the detected exhaust gas temperature and the intake air temperature detected by the intake air temperature detecting means, wherein the control means is the remaining drying after the exhaust gas temperature reaches a predetermined temperature. Since the drying is completed by changing the maximum value or the minimum value of the intake air temperature during operation, the remaining drying time set after the temperature control works even when the operating environment temperature is high. During the transfer, when the change in the intake air temperature is detected and the change in the maximum value or the minimum value disappears, the drying operation is terminated, so it should be completed in the optimum drying time according to the amount of clothes and the degree of wetness. You can

Further, a rotating drum for drying clothes, an air blowing means for sending warm air into the rotating drum, a heating means provided in an air blowing path into the rotating drum, the air blowing means or the rotating drum. A motor for rotationally driving, an exhaust temperature detecting means for detecting the temperature inside the rotating drum, and an intake temperature detecting means for detecting an intake temperature of the heating means,
The exhaust gas temperature detected by the exhaust gas temperature detection means and the intake air temperature detected by the intake air temperature detection means are input to control means for controlling the drying operation. The remaining drying time after reaching the temperature is set to be completed after the temperature is adjusted even when the operating environment temperature is high, because the drying is completed by the change amount of the intake air temperature at every predetermined timing during operation. While the remaining drying time is running, the drying operation is terminated when the intake air temperature does not change at every predetermined timing, so there is no complicated algorithm for detecting maximum and minimum values, and the amount of clothes and wetness The drying time can be optimized depending on the degree.

Further, the heating means is divided into a plurality of parts, and a switching means for turning on / off each heating means is provided. The control means measures the intake air temperature at a predetermined timing when the exhaust gas temperature reaches a predetermined temperature, and Since at least one of the heating means is turned off by the switching means, at least one of the heating means divided into a plurality of times is turned off every time temperature control works, and the intake air temperature at that time is measured to change the change. Since the drying operation is terminated when the temperature disappears, the intake air temperature becomes a value close to the maximum value at the timing when the temperature control works and the heating means is turned off, and it is possible to detect a highly accurate change in the maximum value by a simple method.

Further, a rotary drum for drying clothes, an air blowing means for sending warm air into the rotary drum, a heating means provided in an air blowing path into the rotary drum, the air blowing means or the rotary drum. A motor for rotationally driving, an exhaust temperature detecting means for detecting the temperature inside the rotating drum, and an intake temperature detecting means for detecting an intake temperature of the heating means,
The exhaust gas temperature detected by the exhaust gas temperature detection means and the intake air temperature detected by the intake air temperature detection means are input to control means for controlling the drying operation. During the remaining drying time after reaching, if the exhaust temperature exceeds the specified temperature plus the specified value, the drying process will end, so the clothes will dry and the temperature control will work to turn off the heating means. Even when the operating environment temperature is high, the exhaust temperature rises above the specified temperature during operation for the remaining drying time that is set after temperature control works, even if the operating environment temperature is high. Since the drying operation is terminated when the value is equal to or more than the predetermined value, the drying operation can be terminated in an optimum drying time according to the amount of clothes and the degree of wetness.

Further, the control means controls the delay time set by the temperature difference between the exhaust gas temperature and the intake air temperature and the operating time when the exhaust gas temperature reaches a predetermined temperature, and the temperature difference after the delay time elapses. Since the total time with the set correction time is set as the remaining drying time, even if it becomes impossible to accurately detect the change of the maximum value or the minimum value of the intake air temperature, the drying time is long for a small amount of clothes. It is possible to prevent the product from becoming too dry and not becoming undried in the case of a large amount of clothes.

Further, since the ambient temperature detecting means for detecting the ambient temperature is provided, the control means inputs the ambient temperature detected by the ambient temperature detecting means and corrects the predetermined value by the ambient temperature. The optimum drying time can be completed depending on the amount of clothes and the degree of wetness regardless of the ambient temperature.

[Brief description of drawings]

FIG. 1 is a block diagram of a clothes dryer according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the clothes dryer.

FIG. 3 is a characteristic diagram showing changes with time in temperature of each part of the clothes dryer.

FIG. 4 is an operation flowchart of the clothes dryer.

FIG. 5 is a characteristic diagram showing changes with time in temperature of each part of the clothes dryer.

FIG. 6 is an operation flowchart of the clothes dryer according to the second embodiment of the present invention.

FIG. 7 is a characteristic diagram showing changes with time in temperature of each part of the clothes dryer.

FIG. 8 is an operation flowchart of the clothes dryer according to the third embodiment of the present invention.

FIG. 9 is a characteristic diagram showing changes with time in temperature of each part of the clothes dryer.

FIG. 10 is a room temperature detection flowchart of the clothes dryer according to the fourth embodiment of the present invention.

FIG. 11 is a characteristic diagram showing changes with time in temperature of each part when operation is started in a state where the rotating drum of the clothes dryer is cold.

FIG. 12 is a characteristic diagram showing changes with time in temperature of each part when the operation is started in a state where the rotary drum of the clothes dryer is warm.

FIG. 13 is a reference characteristic diagram for explaining the operation of the clothes dryer.

FIG. 14 is a characteristic diagram showing changes with time in temperature of various parts of a conventional clothes dryer.

FIG. 15 is a characteristic diagram showing a temperature control operation of the clothes dryer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotating drum 2 heat exchange type | mold double-blade fan (blowing means) 3 PTC heater (heating means) 5 motor 6 1st thermistor (exhaust temperature detection means) 7 2nd thermistor (intake temperature detection means) 9 control means

Claims (6)

[Claims] 1. A rotating drum for drying clothes, an air blowing unit for sending warm air into the rotating drum, a heating unit provided in an air blowing path into the rotating drum, the air blowing unit or the rotating drum. For rotating the motor, exhaust temperature detecting means for detecting the temperature in the rotating drum, intake temperature detecting means for detecting the intake temperature of the heating means, exhaust temperature detected by the exhaust temperature detecting means, and intake air And a control means for controlling the drying operation by inputting the intake air temperature detected by the temperature detection means, wherein the control means controls the remaining drying time after the exhaust gas temperature reaches a predetermined temperature during operation. A clothes dryer that finishes drying depending on the amount of change in the maximum value or the minimum value of. 2. A rotating drum for drying clothes, an air blowing unit for sending warm air into the rotating drum, a heating unit provided in an air blowing path into the rotating drum, the air blowing unit or the rotating drum. For rotating the motor, exhaust temperature detecting means for detecting the temperature in the rotating drum, intake temperature detecting means for detecting the intake temperature of the heating means, exhaust temperature detected by the exhaust temperature detecting means, and intake air A control means for controlling the drying operation by inputting the intake air temperature detected by the temperature detection means, wherein the control means controls the drying time remaining after the exhaust temperature reaches a predetermined temperature during a predetermined operation. A clothes dryer that finishes drying depending on the amount of change in intake air temperature at each timing. 3. The heating means is divided into a plurality of parts, and the switching means is provided for turning on / off each heating means, and the control means measures the intake air temperature at a predetermined timing when the exhaust gas temperature reaches a predetermined temperature, and at the same time, The clothes dryer according to claim 2, wherein at least one of the heating means is turned off by a switching means. 4. A rotating drum for drying clothes, an air blowing unit for sending warm air into the rotating drum, a heating unit provided in an air blowing path into the rotating drum, the air blowing unit or the rotating drum. For rotating the motor, exhaust temperature detecting means for detecting the temperature in the rotating drum, intake temperature detecting means for detecting the intake temperature of the heating means, exhaust temperature detected by the exhaust temperature detecting means, and intake air And a control means for controlling the drying operation by inputting the intake air temperature detected by the temperature detection means, wherein the control means controls the exhaust temperature while operating the remaining drying time after the exhaust temperature reaches a predetermined temperature. A clothes dryer that finishes drying when the temperature exceeds a predetermined temperature plus a predetermined value. 5. The control means controls the delay time set by the temperature difference between the exhaust gas temperature and the intake air temperature and the operating time when the exhaust gas temperature reaches a predetermined temperature, and the temperature difference after the delay time elapses. The clothes dryer according to claim 1, 2 or 4, wherein a total time including a set correction time is a remaining drying time. 6. An ambient temperature detecting means for detecting the ambient temperature is provided, and the control means inputs the ambient temperature detected by the ambient temperature detecting means and corrects a predetermined value by the ambient temperature. Item 4. The clothes dryer according to item 4.