JP3022154B2 - Clothes dryer - Google Patents

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 drying clothes stored in a rotating drum.

[0002]

2. Description of the Related Art Conventionally, a clothes dryer that supplies heated air to a rotating drum containing clothes and rotates the rotating drum to dry the clothes has been used. Such a clothes dryer is generally provided with a fan, and the air in the clothes dryer is circulated through a circulation duct connected to a rotating drum by rotation of the fan. A heating heater is mounted near the entrance of the rotating drum, and the air that has been sent through the circulation duct is heated by the heating heater to generate heated air, and the generated heated air is supplied to the rotating drum. You. In the rotating drum, heat exchange is performed between the supplied heated air and the clothing, and thereby the moisture permeating the clothing is evaporated. The moist air is exhausted from the rotating drum to the circulation duct. The exhausted hot and humid air is circulated again by the fan. At this time, by taking in outside air from the outside air intake formed on the back of the clothes dryer,
For example, cooling the back of the fan cools the hot and humid air exhausted from the rotating drum that hits the fan,
The water contained therein is condensed. The dehumidified air is sent to the outlet side of the circulation duct again by the rotation of the fan. The condensed water is drained out of the dryer from a predetermined drain port.

In this type of clothes dryer, generally, ON / OFF control of a heater is performed in order to realize good drying. An example of a clothes dryer that performs ON / OFF control of the heater is disclosed, for example, in JP-A-4-643 9 9 No.. In the prior art disclosed in this publication, two heaters each composed of a positive temperature coefficient thermistor are used, a drum outlet temperature detected by a temperature sensor provided near an outlet of the rotating drum, and a heater outlet temperature. ON / OFF of the heater based on a heater inlet temperature detected by a temperature sensor provided on the upstream side.
OFF control is performed.

More specifically, the ON / OFF control of the heater is performed so that the temperature of the clothes stored in the rotating drum is maintained within a predetermined range after the temperature of the clothes reaches a reference temperature or higher. Done. The temperature of the clothes stored in the rotating drum can be considered to be the same as the temperature at the outlet of the drum because heat is exchanged in the rotating drum. Therefore, in the ON / OFF control of the heater, when the drum outlet temperature is equal to or higher than the predetermined upper limit temperature, the drum outlet temperature is controlled to be lower, and the drum outlet temperature is lower than the predetermined lower limit temperature. In such a case, the temperature is controlled so that the temperature at the outlet of the drum is increased. The above control for lowering the drum outlet temperature is performed by turning off the heater. That is, when the heating heater is turned off, the temperature of the heated air to be supplied to the rotary drum decreases, so that the drum outlet temperature also decreases.

Here, the number of heaters to be turned off is
It depends on whether the heater inlet temperature is equal to or higher than a predetermined temperature. That is, when the heater inlet temperature is equal to or higher than the predetermined temperature and the drum outlet temperature is equal to or higher than the upper limit temperature, both heaters are turned off. On the other hand, when the heater inlet temperature is lower than the predetermined temperature and the drum outlet temperature is equal to or higher than the upper limit temperature, only one of the heaters is turned off.

As described above, when only one heater is turned off when the heater inlet temperature is lower than the predetermined temperature, the drum outlet temperature can be sufficiently reduced without turning off both heaters. Because. More specifically, the heater inlet temperature is a value proportional to room temperature. That is, the case where the heater inlet temperature is lower than the predetermined temperature is a case where the room temperature is relatively low in winter or the like. Therefore, when the room temperature is relatively low, the drum outlet temperature can be sufficiently reduced even if only one of the heaters is turned off.

[0007]

However, in the above prior art, for example, when the room temperature is relatively low, the outside air for cooling cannot be taken in when the outside air intake is blocked by dust or the like. The air exhausted from the rotating drum cannot be cooled. As a result, the uncooled air is reheated by one of the heaters that are turned on, so that the temperature inside the rotating drum rises abnormally. Therefore, there is a problem that the subsequent operation cannot be performed normally.

Therefore, an object of the present invention is to solve the above-mentioned technical problems, and to solve the problem even when the room temperature is relatively low and the outside air intake is blocked by dust or the like. An object of the present invention is to provide a clothes dryer capable of performing a normal operation.

[0009]

According to a first aspect of the present invention, there is provided a clothes dryer having an air inlet and an air outlet, a rotating drum for storing clothes, and an air in the rotating drum. One end is connected to the outlet and the other end is connected to the air intake of the rotary drum. A circulation air passage means, and two heating means provided near the other end in the circulation air passage means for generating heated air. Means and clothing to enter and exit from outside air inlet and outlet
The outer surface is exposed to the atmosphere in which the class of dryers are arranged , and the inner surface thereof has a heat exchange type air blower provided with a fan for circulating the air in the circulation air passage means, and a heat exchange type air blower. First temperature detecting means for detecting the temperature of the air circulated by the means and exhausted from the air outlet of the rotary drum, and an atmosphere in which the clothes dryer is arranged
A second temperature detecting means for detecting a temperature proportional to the temperature of the atmosphere or an ambient temperature; and detecting the temperature by the first temperature detecting means when the temperature detected by the second temperature detecting means is lower than a predetermined temperature. Temperature is the drying temperature in the drum
Equal to or greater than the set upper limit temperature within a predetermined temperature range
Sometimes, one of conductible out of the two heating means ban was
Sealed, the temperature detected by the first temperature detecting means is a drum
Setting within the temperature range set as the drying temperature within
When the temperature becomes lower than the lower limit temperature, the energization control means for energizing both of the two heating means, and the temperature detected by the first temperature detection means becomes equal to or higher than a predetermined abnormal temperature higher than the set upper limit temperature. and a discriminating means for discriminating whether or not becomes, the energization control means, when the upper Symbol discriminating means is detected by the first temperature detector temperature is determined to equal to or higher than the abnormal temperature, the two It is characterized in that both energization of the heating means is prohibited.

[0010]

[0011]

[Action] In the configuration according to the first aspect, when the temperature detected by the second temperature detection means is lower than a predetermined temperature, sometimes the temperature detected by said first temperature detecting means becomes higher than the set upper limit temperature , of one of the two heating means
Conductible is prohibited, sometimes the temperature detected by the first temperature detecting means becomes lower than the set lower limit temperature, both of the two heating means are energized.

When only one of the two heating means is energized, the temperature of the heated air to be supplied to the rotary drum is usually lower than when both are energized. The temperature of the air exhausted from is relatively reduced. The temperature of the heated air to be supplied to the rotary drum is lowered because the high-temperature and high-humidity air exhausted from the air outlet of the rotary drum is cooled by the outside air and dehumidified.

If the outside air intake is blocked by dust or the like, outside air cannot be taken in. Then, the temperature of the air exhausted from the rotating drum does not decrease, and the air whose temperature has not decreased is reheated by one of the heating means that is energized. The temperature of the heated air to be supplied becomes abnormally high. As a result, the temperature of the air exhausted from the rotating drum rises rather than decreases, and the subsequent operation cannot be performed normally.

Therefore, according to the present invention, an abnormal temperature is set for the temperature of the air exhausted from the rotating drum, and when the temperature of the air exhausted from the rotating drum becomes higher than the abnormal temperature , the two heating means are connected. Are prohibited from being energized. Therefore, even if the outside air intake is blocked by dust or the like, the temperature of the air exhausted from the rotating drum can be reduced, and the subsequent operation can be performed normally.

[0015]

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view showing a schematic configuration of a clothes dryer according to one embodiment of the present invention. Dryer body 1
A drying chamber 2 is formed inside the drying chamber 2, and a rotating drum 3 for storing clothes is provided in the drying chamber 2. A door 4 is attached to the center of the front surface of the dryer body 1 so as to be openable and closable, and clothes are put into the rotating drum 3 from the door 4.

The rotary drum 3 is rotatably supported on the dryer main body 1 via felt or the like by a ring-shaped sheet metal drum support plate 5 attached so as to surround the door 4 on the front side, and has a rear surface side. The shaft 6 is rotatably supported by the dryer body 1. Further, an air inlet 7 for taking in heated air, which will be described later, is formed in the lower part of the front surface. Further, an air outlet 8 is formed near the center of the rear surface, and the air outlet 8 is covered with a lint filter 9. Reference numeral 10 denotes a sealing member that seals between the drying chamber 2 and a fan chamber described below so that air exhausted from the air outlet 8 does not enter the drying chamber 2.

Behind the rotary drum 3, a fan chamber 12 containing a heat exchange type double-sided fan 11 fixed to the shaft 6 is defined by a partially cut away fa casing 13. As will be described in detail later, the double-sided fan 11 functions as a core of a heat exchange type blower that supplies heated air generated by a heater to the rotating drum 3. The fan casing 13 is provided with a partition plate 14 made of synthetic resin so as to surround the double-sided fan 11. This partition plate 14
A double-sided fan 11 is accommodated in a central circular opening of the fan chamber 12, whereby the internal space of the fan chamber 12 is divided into a drying air passage 12a and a cooling air passage 12b. The cooling air passage 12b is
The notched portion of the fan casing 13 is connected to the drying chamber 2.

At the periphery of the double-sided fan 11, a drying air path 12
A concentric rotating groove group 15 opening toward a is formed integrally. The rotating groove group 15 is loosely fitted in a non-contact state with a fixed groove group 16 formed integrally with the partition plate 14. That is, the labyrinth connection is formed by the rotating groove group 15 and the fixed groove group 16. Therefore, the drying air path 12
The air cannot flow between a and the cooling air passage 12b.

A circulation duct 17 is provided below the dryer body 1.
Is provided. This circulation duct 17 is used for drying air path 1
2a and the air inlet 7 are connected, and a heater 18 functioning as a heating means is disposed near the air inlet 7. The heater 18 is composed of, for example, four honeycomb-shaped positive temperature coefficient thermistors. At the lowest part of the circulation duct 8, condensed water described below is
A drain port 19 for draining outside is formed. In this embodiment, the circulation duct 17 and the drying air path 12
a constitutes a circulation air path means.

A motor 20 is provided at the bottom of the main body 1 of the dryer. The motor 20 applies a rotational force to the belt 21 wound around the outer peripheral surface of the rotary drum 3 via a pulley 22, while applying a rotational force to the shaft 6 via a pulley 23 and a fan belt 24. As a result, the rotating drum 3
And the double-sided fan 11 is rotated. Pulley 2 above
A rotation sensor 25 for detecting the number of rotations of the motor 20 is attached to 3. The idler pulley 26 is for applying a tension to the belt 21 when the rotary drum 3 rotates, thereby preventing the belt 21 from slipping.

When the double-sided fan 11 rotates, air is sent from the drying air passage 12a to the circulation duct 17. The air sent to the circulation duct 17 is heated by the heater 18 to become heated air, and is taken into the rotating drum 3 from the air inlet 7. In the rotating drum 3, heat exchange is performed between the taken-in heated air and the clothes. As a result, the moisture contained in the clothes is evaporated. The air containing moisture is sent again to the drying air passage 12a by the rotation of the double-sided fan 11. In other words, the air circulates through the drying air passage 12a, the circulation duct 17 and the rotating drum 3 by the rotation of the double-sided fan 11.

When the double-sided fan 11 rotates, outside air is taken into the cooling air passage 12b from an outside air inlet 27 formed in the center of the rear surface of the dryer main body 1. At this time, the double-sided fan 11 is cooled by the outside air. The taken outside air passes through the drying chamber 2 from the cooling air passage 12b, and is exhausted from an outside air outlet 28 formed at a lower portion of the dryer main body 1. In addition,
In the present embodiment, the double-sided fan 11 and the outside air inlet 2 are used.
7 functions as a heat exchange type blowing means.

The air in the drying air passage 12a is
Cools when in contact with. That is, since the two-sided fan 11 is cooled by the outside air, the air in the drying air passage 12a is cooled by contacting the two-sided fan 11. Therefore, moisture in the air exhausted from the rotating drum 3 is condensed. The dehumidified air is sent to the circulation duct 17 again by the rotation of the double-sided fan 11. The condensed water flows down the drying air passage 12a and is drained from the drain port 19.

In the vicinity of the air outlet 8 of the rotary drum 3, an outlet temperature sensor 29H for detecting the temperature of the air exhausted from the rotary drum 3 is arranged. Outlet temperature sensor 29
H is constituted by a heat-sensitive element such as a thermistor. A control plate 30 provided with various input keys and indicators is provided below the front surface of the dryer main body 1. A substrate case 31 made of a synthetic resin is attached to the rear of the control plate 30 and in the drying chamber 2 below the dryer main body 1 with screws 32. The board case 31 contains a control board (not shown) made of a member having a large heat capacity that is not easily affected by a sudden change in the ambient temperature. On the control board,
A microcomputer described later and an ambient temperature sensor 33L for detecting a substrate temperature of the control substrate are mounted. This ambient temperature sensor 33L is also formed of a heat-sensitive element such as a thermistor.

FIG. 2 is a front view in which a part of the control plate 30 is omitted. The control plate 30 has a power switch (S) for turning on the power.
W) 40, a start / pause switch (SW) 41 for starting or temporarily stopping the drying operation, and a course selection switch 42 for selecting a drying course such as "standard course" or "slightly drying". I have. The control plate 30 has a heater changeover switch 4 for selecting the degree of air heating by the heater 18.
3. LED display 4 to inform the user of the drying process
4, and a sign display 45 for notifying the user of clogging of the lint filter 9 is provided.

FIG. 3 is a block diagram showing an electrical configuration of the clothes dryer. The clothes dryer is provided with a microcomputer 50 for controlling the operation of each part of the clothes dryer. This microcomputer 5
0 includes a CPU, a ROM, a RAM, and a timer, all of which are not shown, and performs predetermined control according to a program stored in the ROM. In the present embodiment, the microcomputer 50 functions as an energization control unit, a determination unit, and the like.

The microcomputer 50 includes a rotation speed detection circuit 51 including a rotation sensor 25, a power switch 4
0, etc., an input key circuit 52, a door switch 53 for detecting opening and closing of the door 4, an LED lighting circuit 54 including an LED indicator 44, etc., a reset circuit 55 including the start / pause switch 41, and a clock for generating a clock The oscillation circuit 56 is connected.

The microcomputer 50 is connected to a power supply circuit 57 connected to a commercial power supply, a power supply voltage determination circuit 58 for determining the voltage of the power supply circuit 57, and a buzzer for notifying the end of the drying operation. Buzzer circuit 59,
And a commercial power supply zero-cross signal detection circuit 60 for detecting the zero cross of the commercial power supply. Further, the microcomputer 50 has an outlet temperature sensor 29H,
Atmospheric temperature sensor 33L, motor 20, heater 18 including first heater 18a and second heater 18b, and automatic power for automatically shutting off the power supply to the clothes dryer after the drying operation is completed. Off (A
PO) 61 is connected to a load drive circuit 62 for driving the same. Each of the first heater 18a and the second heater 18b has a structure in which two positive temperature coefficient thermistors are formed in a honeycomb shape. When "weak" is selected by the heater switch 43, only one of the first and second heaters 18a and 18b is turned on. When energized, and "strong" is selected, both are energized.

FIG. 4 is a diagram showing changes in the outlet temperature T1 detected by the outlet temperature sensor 29H and the substrate temperature T2 detected by the ambient temperature sensor 33L with respect to the operation time t in this embodiment. The outlet temperature T1 changes as shown by a curve L1. That is, in the preheating period I, the amount of heat applied is spent to increase the temperature of the dryer main body 1 and the clothing itself containing a large amount of moisture, so that the outlet temperature T1 gradually increases, and in the constant-rate drying period II, Since most of the applied heat is used to evaporate the moisture in the clothes, the outlet temperature T1 is substantially constant. In addition, in the decreasing rate drying period III, the outlet temperature T1 rises again because the amount of heat applied is consumed not only for evaporation of moisture but also for increasing the temperature of the clothing itself or the dryer main body 1 in which moisture is reduced. I will do it.

In the deceleration drying period III, the outlet temperature T1 is set to a predetermined upper limit temperature _Tmax (for example, _Tmax = 84).
Lowered after reaching ° C.), outlet temperature T1 rises again when reduced to a predetermined lower limit temperature T _{mi n} (e.g. T _min = 82 ° C.), and so on, the outlet temperature T1 is the predetermined range T
_mm (T _mm = 2 ° C. in the above example) because the ON / OFF control of the heater 18 described later is performed. The ON / OFF control of the heater 18 is performed to achieve good drying.

On the other hand, the substrate temperature T2 is represented by a curve L2
It changes like That is, it rises very slowly at first, and after a certain period of time (for example, 60
Minutes), stable transition. FIGS. 5, 6 and 7 show that the drying process in the clothes dryer is performed by turning on the heater 18.
6 is a flowchart for explaining mainly the / OFF control.

As shown in FIG. 5, when the user puts clothes into the rotating drum 3 and turns on the power switch 40 and the start / pause switch 41 (step S1), first, various flags are initialized. You. That is,
A temperature down flag DF indicating whether the outlet temperature T1 is higher or lower than the predetermined range T _mm and a heater strong flag HF indicating whether both heaters 18 are to be turned on are reset (steps S2 and S3). . Thereafter, as will be described in detail later, the time to be counted by the counter for counting the time until both heaters 18 are turned on is set to a predetermined time (for example, 2 minutes) (step S4).

Next, a process for acquiring various data necessary for ON / OFF control of the heater 18 is performed (step S5). Details of this data acquisition processing will be described later. Thereafter, the motor 20 is turned on (step S
6). When the motor 20 is turned on, a driving force is applied to the rotating drum 3 and the double-sided fan 11 in accordance with this,
The rotating drum 3 and the double-sided fan 11 rotate. Subsequently, ON / OFF control of the heater 18 is performed based on the various data acquired in step S5 (step S7). The details of the ON / OFF control processing will also be described later. Then, after performing other controls necessary for drying (step S8), it is determined whether the drying process has been completed (step S9).

In the drying process, for example, the outlet temperature sensor 29
H and the temperature difference T (T = | T) between the outlet temperature T1 and the substrate temperature T2 detected by the ambient temperature sensor 33L, respectively.
1-T2 |) reaches a predetermined temperature difference T _th1 (for example, T _th1 = 10 deg) or when a separately designated time elapses from the start of the drying process. You.

If it is determined in step S9 that the drying process has not been completed, the process proceeds to step S2.
Steps S8 to S8 are repeated. On the other hand, if it is determined that the drying process has been completed, a cool-down process is performed for the purpose of cooling the clothing, which has become hot in the drying process, so that the user can easily take it out (step S10). This cool-down process is performed with the heater 18 turned off, and when the outlet temperature T1 detected by the outlet temperature sensor 29H reaches a predetermined temperature difference T _th2 (for example, T _th2 = 40 ° C.), or It ends when the cool down time has elapsed.

After the cooling down process is completed, the motor 20 is turned off, and the entire drying process is completed. FIG. 6 is a flowchart for explaining the data acquisition process in step S5. In the following description, FIG.
See also In this data acquisition process, first, the substrate temperature T2 detected by the ambient temperature sensor 33L is set to the reference temperature T.
₀ (for example, T ₀ = 40 ° C.) or more is determined (step S11). The substrate temperature T2 is a temperature substantially proportional to room temperature. That is, in step S11,
The level of the room temperature is determined. The purpose of determining the level of the room temperature is to make the number of the heaters 18 to be turned off differ depending on the level of the room temperature, as described later.

The result of the discrimination at step S11, the substrate temperature T2 is determined to be the reference temperature T ₀ or more, are set reference temperature flag KF indicating that the substrate temperature T2 is the reference temperature T ₀ or more (step S12), the the substrate temperature T2 is determined to be less than the reference temperature T _0, the reference temperature flag KF is reset (step S1
3).

Next, when the outlet temperature T1 detected by the outlet temperature sensor 29H is equal to the abnormal temperature T ₁ (for example, T ₁ = 88 ° C.)
It is determined whether this is the case (step S14). The abnormal temperatures T ₁ and, when the outlet temperature T1 rises more, clothing and rotary drum are housed in the rotary drum 3 3
This is the temperature at which it is determined that the device itself abnormally heats and the subsequent operation of the clothes dryer cannot be performed normally.

The result of the discrimination at the step S14, when the outlet temperature T1 is determined to be abnormal temperature above T _1, is abnormal temperature flag EF is set to indicate that the outlet temperature T1 is abnormal temperature above T ₁ (step S15), and the outlet temperature T1 is determined to be less than the abnormal temperature T _1, the abnormal temperature flag EF is reset (step S1
6).

[0041] Incidentally, there possibly the outlet temperature T1 becomes abnormal temperature above T ₁ is only falling rate drying period III (see FIG. 4). Next, it is determined whether or not the temperature down flag DF is set (step S17). As a result, if it is determined that the temperature down flag DF is not set, then it is determined whether the outlet temperature T1 is _lower than the upper limit temperature _Tmax (step S18), and the outlet temperature T1 is set to the upper limit temperature _Tmax. Only when this occurs, the temperature down flag DF is set (step S19). On the other hand, if it is determined that the temperature down flag DF is set, then it is determined whether the outlet temperature T1 is _{equal to} or higher than the lower limit temperature Tmin (step S20), and the outlet temperature T1 is determined.
Is lower than the lower limit temperature _Tmin , the temperature down flag DF is reset (step S21).

More specifically, in FIG.
During the period, the temperature down flag DF remains reset (since it has been reset in advance in step S2). When the outlet temperature T1 becomes higher than the upper limit temperature _Tmax , the temperature down flag DF is set, and this state is continued. And the outlet temperature T1
Is reached, the temperature becomes lower than the lower limit temperature _Tmin , so that the temperature down flag DF is reset.

After the processes in steps S17 to S21 are completed, if the time to be counted by the counter is set, the counting of the counter is started (step S22). For example, immediately after the start of the drying process, since a predetermined time (two minutes in the above example) is set in the above step S4, counting is started. After such counting is completed (step S23), the heater strength flag HF is set (step S24).

FIG. 7 shows the heater 1 in step S6.
8 is a flowchart for explaining ON / OFF control of No. 8; FIG. 4 is also referred to in the description of the ON / OFF control. In the ON / OFF control of the heater 18, it is first determined whether or not the temperature down flag DF is set (step S25). As a result, when it is determined that the temperature down flag DF has not been set, it is determined whether or not the heater strong flag HF has been set (step S26). As a result, if it is determined that the heater is set, the first and second heaters 18
Both a and 18b are turned ON (step S27).
On the other hand, if it is determined that the heater has not been set, one of the first and second heaters 18a and 18b is turned on and the other is turned off (step S28).

More specifically, the temperature down flag DF and the heater strong flag HF are reset immediately after the start of the drying process and before the counting of the counter is completed. Therefore, only one of the first and second heaters 18a and 18b is turned on. After the end of the counting by the counter, until the outlet temperature T1 becomes equal to or higher than the upper limit temperature _Tmax , the temperature down flag DF and the heater strong flag HF
Are reset and set respectively, so the first
The second heaters 18a and 18b are both turned on.

Meanwhile, as a result of the discrimination at the step S25, if the temperature down flag DF is judged to have been set, whether the outlet temperature T1 has reached an abnormal temperature T ₁ is it is determined (step S29 ). As a result, when the outlet temperature T1 is determined to have reached the abnormal temperature T _1, the first and second heater 18a, 18b are OFF both (step S33). In other words, the level of the substrate temperature T2, i.e. regardless of the level of room temperature, the outlet temperature T1 becomes abnormal temperature above T _1, the first and second heater 18a, 18b are OFF both. This allows
Since the temperature of the heated air to be supplied to the rotating drum 3 can be greatly reduced, the outlet temperature T1 decreases. That is, as shown in FIG. 4, after the outlet temperature T1 has become lower, it decreases as in the period after.

The first and second heaters 18
Prior to turning off a and 18b, the heater strong flag HF is reset (step S31), and a predetermined time (for example, one minute) is set in a counter (step S32). The predetermined time to be set is a time sufficiently longer than the time when the outlet temperature T1 changes from the state shown in FIG. This is to prevent as much as possible the burden on each of the heaters 18a, 18b due to the sudden turning on of both the first and second heaters 18a, 18b. That is, while the counter is counting, the heater strong flag HF is reset, so that the first or second heater 18a, 18a,
18b is turned ON. Therefore, the load on the heater 18 can be minimized.

Meanwhile, as a result of the discrimination at the step S29, when the outlet temperature T1 is determined not to be abnormal temperature above T _1, whether the reference temperature flag KF is set is determined (step S30) . Next, the purpose of this determination will be described. That is, the temperature down flag DF
Is set when it is determined that the outlet temperature T1 is _{equal to} or higher than the upper limit temperature _Tmax. Therefore, when the temperature down flag DF is set, the ON / OFF of the heater 18 is set.
In the F control, the heater 18 is turned off to lower the outlet temperature T1. However, when the room temperature is low, the heaters 18 to be turned off are usually both turned off.
Even without doing so, the outlet temperature T1 drops sufficiently. Therefore, the level of the room temperature is determined in step S30.

If it is determined in step S30 that the reference temperature flag KF has been set, the room temperature is determined to be relatively high. In order to lower the temperature, the heater strong flag HF is reset (step S31), and after a predetermined time is set in the counter (step S32),
If the first and second heaters 18a and 18b are both O
FF is performed (step S33). On the other hand, if it is determined that the reference temperature flag KF is not set, it is determined that the room temperature is relatively low, so that either one of the first and second heaters 18a and 18b is turned on and the other is turned on. Is turned off (step S28).

When the outside air inlet 27 is closed by dust or the like, the outlet temperature T1 rises without decreasing even if only one of the heaters 18 is turned off. However,
When the outlet temperature T1 becomes to continue abnormal temperature above T ₁ increases, the first and second by the discrimination at step S28
Since both the heaters 18a and 18b are turned off,
The outlet temperature T1 drops without fail. Therefore, subsequent operations can be performed normally, so that good drying can be realized.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above embodiment, the ambient temperature sensor 33L mounted on the control board has been described as an example of the second temperature detecting means, but the second temperature detecting means detects the temperature near the inlet of the heater 18 as the second temperature detecting means. Temperature sensor for directly detecting the room temperature, or any other sensor that detects a temperature proportional to the room temperature can be applied. When the temperature near the inlet of the heater 18 is detected, the reference temperature T ₀ is 50
C. is preferable, and when the room temperature is directly detected, the reference temperature T ₀ is preferably 30 ° C.

In the above embodiment, the case where the positive temperature coefficient thermistor is used as the heating means has been described. However, for example, a gas heater or other heating elements can be applied as the heating means. Various other design changes can be made without changing the gist of the present invention.

[0053]

According As described above, according to the present invention the clothes drying machine of the present invention, there is when low outside air in winter or the like, even when the temperature detected by the second temperature detection means is lower than a predetermined temperature,
When the determining means determines that the temperature detected by the first temperature detecting means has become equal to or higher than a predetermined abnormal temperature, 2
The energization of both heating means is prohibited. Therefore, since the temperature of the air exhausted from the rotating drum decreases, the subsequent operation can be performed normally. Therefore, good drying can be realized.

[0054]

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of a clothes dryer according to one embodiment of the present invention.

FIG. 2 is a front view in which a part of a control plate constituting a part of the clothes dryer is omitted.

FIG. 3 is a block diagram showing an electrical configuration of the clothes dryer.

FIG. 4 is a diagram showing a time change of each temperature detected by two temperature sensors constituting a part of the clothes dryer.

FIG. 5 is a flowchart illustrating a drying process of the clothes dryer.

FIG. 6 is a flowchart for explaining a drying process of the clothes dryer.

FIG. 7 is a flowchart for explaining a drying process of the clothes dryer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dryer main body 3 Rotary drum 11 Double-sided fan 12a Dry air path 17 Circulation duct 18 Heater 29H Outlet temperature sensor 33L Atmospheric temperature sensor 50 Microcomputer

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-64399 (JP, A) JP-A-62-243598 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06F 58/28 F26B 25/22

Claims (1)

(57) [Claims] 1. A rotating drum having an air inlet and an air outlet for containing clothes, a circulation drum having one end connected to the air outlet of the rotating drum and the other end connected to the air intake of the rotating drum. An atmosphere in which an air path means, two heating means provided near the other end in the circulation air path means for generating heated air, and a clothes dryer which enters and exits through an outside air inlet / outlet;
The heat exchange type air blower provided with a fan for circulating the air in the circulation air passage means, and the inner surface thereof is circulated by the heat exchange type air blower, First temperature detecting means for detecting the temperature of the air exhausted from the air outlet of the drum, and the temperature or atmosphere of the atmosphere in which the clothes dryer is arranged
A second temperature detecting means for detecting a temperature proportional to the temperature; and, if the temperature detected by the second temperature detecting means is lower than a predetermined temperature, the temperature detected by the first temperature detecting means is set to a value within the drum. Within the temperature range set as the drying temperature
Sometimes becomes more definitive set upper limit temperature setting, prohibit one conductible out of the two heating means, the temperature detected by the first temperature detecting means as the drying temperature in the drum
Has been a <br/> Kiniwa becomes less than the set lower limit temperature in the temperature range, the energization control means for energizing both of the two heating means, the temperature detected by the first temperature detecting means, Set upper limit temperature
And a judging means for judging whether an abnormal temperature or higher which is determined higher advance than degrees, the energization control means, the temperature detected by the first temperature detecting means by an upper SL discrimination means abnormal temperature If it is determined that the above is the case, the current supply to both of the two heating means is prohibited.