JPH07289796A - Dryer - Google Patents

Abstract

PURPOSE:To shorten drying time while eliminating power supply breaker troubles. CONSTITUTION:A microcomputer 33, from the time of starting heating operation until the time when a certain time elapses, is to heat air sent to a drying room by a regenerator only. When such a certain time has passed, it is to give heat to air transmitted to the drying room, not only by the regenerator, but also PTC heaters 22a, 22b electrified by the microcomputer, for generating heat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer provided with a heater having a positive temperature characteristic as a heater for generating warm air.

[0002]

2. Description of the Related Art Conventionally, a dryer provided with a heater having a positive temperature characteristic is used as a heater for generating warm air. In this device, warm air is generated by the heater and the fan and is supplied to the inside of the drum, that is, the drying chamber, so that the material to be dried previously stored in the drying chamber is dried. In this case, the drying rate of the material to be dried is detected, and when the detected drying rate reaches a predetermined value, the completion of drying is detected, and then the finishing operation is performed and the drying operation is ended. .

[0003]

By the way, in the dryer, it has been desired to shorten the drying time more than before. As measures against this, the following measures are considered.
That is, a heater having a positive temperature characteristic increases the amount of heat generated by an increase in the amount of air blown.
The amount of air blown by the fan is increased to increase the amount of heat generated by the heater. However, while the wind passing through the heater is cold in the initial stage of the dry operation, a large current flows through the heater having a positive temperature characteristic to operate the power breaker in a general household. Therefore, the rated capacity of the heater cannot be increased so much, the amount of heat generated by the heater during steady operation cannot be expected to increase, and the drying time cannot be shortened.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a dryer capable of shortening the drying time while preventing the power breaker from operating.

[0005]

According to the present invention, there is provided a fan for supplying air into a drying chamber in which an article to be dried is accommodated, and a main heater having a positive temperature characteristic provided in an air passage to the drying chamber. A heat storage device configured to have a heat storage body and a heat storage heater for heating the heat storage body and provided in a ventilation path to the drying chamber; and controlling the heat storage heater to bring the heat storage body into a heat storage state. The heat storage control means and the main heater is turned off until the predetermined time elapses from the start of the drying operation to heat the air supplied to the drying chamber by the heat of the heat storage body, and then the main heater is energized. And an operation control means for controlling the air to be heated by the heat generation of the main heater and the heat of the heat storage body (the invention of claim 1).

In this case, the heat storage device may be provided upstream of the main heater in the ventilation passage.
Invention). The heat storage control means energizes the heat storage heater to heat the heat storage body, and when the temperature of the heat storage body reaches a predetermined temperature, controls the heat storage heater to keep the heat storage state, and after the drying operation starts, the main heater The heat retention state may be canceled when the power is supplied to the device (the invention of claim 3).

Further, the heat storage control means energizes the heat storage heater to heat the heat storage body after the completion of the drying operation, and when the temperature of the heat storage body reaches a predetermined temperature, controls the heat storage heater to keep the heat storage state. May be set (the invention of claim 4).

Furthermore, when the drying operation is repeated, the heat storage control means does not energize the heat storage heater when the temperature of the heat storage body is equal to or higher than a predetermined temperature, and energizes the heat storage heater when the temperature is lower than the predetermined temperature, and thereafter. The heat storage heater may be turned off when the predetermined temperature is reached (the invention of claim 5).

[0009]

In the above means, since the main heater is in the power-off state and heats the air supplied to the drying chamber by the heat of the heat storage body until a predetermined time elapses from the start of the drying operation, at the start of this drying operation. The air is warmed without a large current flowing through the main heater having a positive temperature characteristic.
Then, after a lapse of a predetermined time, the main heater is energized to heat the wind by the heat generation of the main heater and the heat of the heat storage body, but since the wind has already been warmed at this time, a large current is applied to the main heater. It doesn't flow. Therefore, there is no problem even if the rated capacity of the main heater is increased, the heat generation amount of the main heater can be increased, and the drying time can be shortened.

In this case, if the heat storage device is provided upstream of the main heater in the ventilation passage, the air warmed by the heat storage body of the heat storage device will pass through the main heater.
The main heater itself is satisfactorily warmed up, so that a large current when the main heater is energized can be suppressed satisfactorily.

Further, the heat storage control means controls the heat storage heater by energizing the heat storage heater to heat the heat storage body, and when the temperature of the heat storage body reaches a predetermined temperature, the heat storage heater is controlled to keep the heat storage state,
If the main heater is energized after the start of the drying operation, the heat retention state is released, so that the heat storage body can be kept in the heat storage state at all times and the power consumption when the main heater is energized can be reduced.

Further, the heat storage control means controls the heat storage heater by energizing the heat storage heater to heat the heat storage body after the drying operation is completed, and when the temperature of the heat storage body reaches a predetermined temperature, the heat storage heater is controlled to keep the heat storage state. This is convenient because the heat storage body can always be kept in the heat storage state at the start of the drying operation.

Furthermore, in the heat storage control means, when the drying operation is repeated, the heat storage heater is not energized when the temperature of the heat storage body is equal to or higher than a predetermined temperature, and when the temperature is lower than the predetermined temperature, the heat storage heater is energized and thereafter. If the heat storage heater is turned off when the predetermined temperature is reached, it is possible to continuously perform the drying operation within a short time while preventing the power breaker from operating.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 2 shows a schematic vertical sectional structure of the entire dryer. In this FIG.
The outer box 1 is provided with an entrance / exit 2 of the material to be dried at the center of the front surface, and an entrance / exit door 3 is provided in the entrance / exit 2. The drum 4 housed in the outer box 1 has a drying chamber 4a inside, and a shaft 5 projecting from the center of the rear surface of the drum 4 is rotatable on a support plate 6 provided at the rear part of the outer box 1. In addition to being supported, the cylindrical flange portion 7 formed on the periphery of the large-diameter opening portion of the front surface portion is rotatably supported by the drum support 8 provided in the front portion of the outer box 1. ing. The drum 4 configured as described above is driven by the belt transmission mechanism 1 by the motor 9 disposed in the upper portion of the outer case 1 and capable of rotating in the forward and reverse directions.
It is designed to be rotationally driven through 0.

The air supply device 11 for supplying the air into the drying chamber 4a has a vent hole 12 formed by forming a large number of small holes in the center of the rear part of the drum 4, and a vent hole 12 in the vent hole 12. A fan casing 13 that is in communication with the fan casing 13 is divided into a front and a rear inside of the fan casing 13 and is arranged on the same axis as the shaft 5 to serve as a dehumidifier and has a double-blade shape. And a warm air outlet 16 which is formed by forming a large number of small holes in the drum support 8 and communicates with the duct 15.
And a belt transmission mechanism 17 for transmitting the rotational force of the motor 9 to the fan 14.

The vent 12 of the air supply device 11
A filter 18 is arranged in the portion so as to cover them from the inside of the drum 4. Further, a back plate 19 is provided at the open portion on the back surface of the outer box 1 so as to close the back plate 19, and the back plate 19 is provided with an outside air intake port 20 having a large number of small holes in the central portion, In addition, the louvered outside air return port 21 is provided in the lower portion.

PTC heaters 22a and 22b (only one of the PTC heaters 22a is shown in FIG. 2) which are main heaters having a positive temperature characteristic are provided in a portion in front of the warm air outlet 16 in the duct 15 constituting the ventilation passage. It is arranged. In addition, the duct 15 is located upstream of the PTC heaters 22a and 22b and is located in the heat storage device 2.
3 is arranged via a fixture 23a. As shown in FIG. 3, the heat storage device 23 includes upper and lower heat storage bodies 24, and a heat storage heater 25 formed of, for example, a nichrome wire heater and sandwiched therebetween. . Each heat storage body 24 is configured such that a heat storage material 27 made of, for example, polyethylene glycol is housed inside a metal heat storage case 26, and heat radiation fins 26 a are formed on the outer surface of each heat storage case 26. . Further, a heat storage temperature sensor 28 that detects the temperature of the heat storage body 24 is attached to the heat storage device 23.

On the lower part of the drum support 8, a pair of electrodes 29 are attached so as to face the inside of the drum 4 with a predetermined insulating gap therebetween. These electrodes 2
In FIG. 9, the material to be dried in the drying chamber 4a comes into contact with the rotation of the drum 4, and the resistance value between the electrodes 29 changes to a value lower than that in the steady state at each contact. In this case, the amount of change in resistance between the electrodes 29 has a property that it decreases as the amount of water contained in the material to be contacted decreases, in other words, as the drying rate of the material to be dried increases.
When the resistance value between the electrodes 29 changes, the drying chamber 4a
It is possible to detect the drying rate of the material to be dried.

The casing 13 has a temperature sensor 30 for detecting the temperature of the air (air) flowing out from the drying chamber 4a through the ventilation port 12, that is, the temperature in the drying chamber 4a.
And a control circuit device 31 (see FIG. 1) to be described later for controlling the drying operation in the upper part of the outer box 1.
And a circuit board 3 on which electronic components constituting peripheral circuits are mounted
2 are provided.

FIG. 1 schematically shows an electric configuration of the control circuit device 31 and parts related thereto by a combination of functional blocks, which will be described below. That is, the control circuit device 31 is mainly configured by the microcomputer 33 that constitutes the heat storage control means and the operation control means in the present invention. The power source of the microcomputer 33 is from the AC power source 34 to the rectifier circuit 35.
Although not shown, the power supply of the clock pulse generation circuit 36 for supplying a clock pulse to the microcomputer 33 and the power supply of the detection circuit 37 connected to the electrode 29 are also provided. The configuration is provided from the rectifier circuit 35.

The detection circuit 37 constitutes a drying rate detecting means 38 together with the electrode 29. For example, the resistance value of the pair of electrodes 29 (that is, an electric signal indicating the drying rate of the material to be dried in the drying chamber 4a). ) Is converted into a voltage signal, and the voltage signal is output as a drying rate signal Sk indicating the drying rate of the material to be dried. The drying rate signal Sk is given to the microcomputer 33. On the other hand, a power switch 39 is connected to the AC power source 34, and the motor 9 and the PTC heaters 22 a, 22 are connected via the power switch 39.
b, the heat storage heater 25 and the buzzer 40 are energized.

In the microcomputer 33, in addition to the clock pulse and the drying rate signal Sk described above, a start signal from the start switch 41 for starting the drying operation, a temperature detection signal from the temperature sensor 30, and a temperature sensor 2 for heat storage.
It receives the temperature detection signals from the control unit 8 and the buzzer 40, the motor 9, the PTC heater 22 based on the input signals and the preset control program.
The drive circuit 42 is used to control the connection and disconnection of the heaters a and 22b and the heat storage heater 25.

The drive circuit 42 controls the heater output of the heat storage heater 25 to 200 [W] by phase control, for example.
And 50 [W] can be adjusted. In this case, the means for adjusting the heater output is not limited to the phase control, and for example, a 200 [W] output heater and a 50 [W] output heater may be provided and switched.

The control contents of the microcomputer 33 are shown in FIG. 4, which will be described below along with related operations. The flowchart shown in FIG. 4 starts when a power plug (not shown) is connected to a power outlet, that is, the AC power source 34.
First, the microcomputer 33 uses the heat storage heater 25.
Is energized in the 200 [W] output mode (step S
1). As a result, the heat storage body 24 is heated and stores heat.

Next, it is judged whether or not the temperature t detected by the heat storage temperature sensor 28 has reached a predetermined temperature, for example, 120 ° C. or higher (step S2). When the detected temperature t reaches 120 ° C. or higher, the heat storage heater 25 The output is changed to 50 [W] (step S3), and the temperature is kept warm. After that, when the start switch 41 is operated (determined in step S4) and the drying operation is started, first, the heat storage heater 2
5 is cut off and the motor 9 is turned on.

Then, the drum 4 and the fan 14 are rotated, and as shown by the arrow F in FIG.
The wind generated by 4 is supplied from the fan casing 13 to the drying chamber 4a after passing through the duct 15. In this case, in the duct 15, the above-mentioned air is heated by the heat of the heat storage body 24 kept in a heat-retaining state, so that it is turned into warm air and supplied into the drying chamber 4a. This warm air contributes to the evaporation of the moisture of the material to be dried, and the hot air blows from the drying chamber 4a to the ventilation port 12
Through to the fan casing 13 and circulates as described above. Further, as shown by an arrow G in FIG. 2, an air flow passage is formed in which relatively cool outside air is sucked into the fan casing 13 from the outside air intake port 20 and then returned to the outside from the outside air return port 21. Then, the circulating air causes the fan 14 to exchange heat (cool).
As a result, the water in the hot air flowing through the hot air circulation path condenses on the front side of the fan 14 to cause dew condensation, so that the moisture emitted from the material to be dried in the drum 4 becomes water. A dehumidifying operation of returning and removing is performed.

However, when 30 minutes have passed from the start of the drying operation (determined in step S6), the PTC heater 22
Energize a and 22b (step S7). At this time, since the wind to the drying chamber 4a has already been warmed, the PT
A large current for operating the power breaker does not flow through the C heaters 22a and 22b. In addition to the heat of the heat storage body 24, the heat generated by the PTC heaters 22a and 22b further heats the air to make it hot, which promotes evaporation of moisture in the material to be dried and heat exchange described above.
The material to be dried dries.

In step S8, the drying rate signal Sk
Based on the above, it is determined whether or not the drying rate has reached a predetermined drying rate Ka (drying rate equivalent to completion of drying, for example, 85 to 95%),
When the predetermined drying rate Ka is reached, the finishing operation shown in steps S9 to S14 is executed. That is, the count value of the remaining time T is set to "0" (step S9), and the remaining time T is counted (step S10). When the remaining time T exceeds the predetermined time Ta (step S1
(Determined in 1), the PTC heaters 22a and 22b are turned off (step S12), and thus hot air drying is stopped and cold air drying is performed. This cold air drying operation is executed for 10 minutes (step S13), the motor 9 is cut off (step S14), and the drying operation is completed.

After the completion of the drying operation, the process proceeds to step S15 and thereafter, and the heat storage heater 25 is energized in the 200 [W] output mode (step S15) as in steps S1 to S3 described above, and the heat storage temperature is set. When the temperature t detected by the sensor 28 is 120 ° C. or higher (determined in step S16), the output of the heat storage heater 25 is set to 50 [W].
(Step S17), and the temperature is kept warm. After this, the operation of the start switch 41 is awaited.

According to the present embodiment as described above, the PT is maintained until the predetermined time (30 minutes) elapses from the start of the drying operation.
The C heaters 22a and 22b heat the wind to the drying chamber 4a by the heat of the heat storage body 24 in the power-off state, so at the start of the drying operation, the PTC heater 2 having a positive temperature characteristic.
The wind is warmed to the 2a and 22b without flowing a large current for operating the power breaker. When the above-mentioned predetermined time elapses, the PTC heaters 22a, 22a
b is energized to heat the wind by the heat generated by the PTC heaters 22a and 22b and the heat of the heat storage body 24. At this time, the wind has already been warmed, so the PTC heater 22
No large current flows through a and 22b. Therefore,
There is no problem even if the rated capacity of the PTC heaters 22a and 22b is increased.
The amount of heat generation can be increased. As a result, the drying time can be shortened while preventing the power breaker from operating.

Now, FIG. 5 shows how the temperature of the hot air changes in this embodiment (curve H) and the PTC heaters 22a and 22a.
2b shows how the current changes (curve J) as in the conventional case (curve H).
′, J ′). As can be seen from the figure, the currents of the PTC heaters 22, a, 22b rise immediately after energization (immediately after 30 minutes), but a large current as in the prior art does not flow. Further, the temperature of the warm air is slightly lower than in the conventional case at the initial stage of the drying operation, but when the so-called constant rate drying time zone occupying the main part of the drying time is reached, the temperature of the present example is higher, and eventually, The drying time is shorter in this embodiment.

In particular, according to this embodiment, the heat storage device 23 is
In the duct 15, which is a ventilation path, the PTC heaters 22a, 2a
Since it is provided on the upstream side of 2b, the wind warmed by the heat storage body 24 of the heat storage device 23 is the PTC heater 2
2a, 22b, the PTC heater 22
The a and 22b themselves are satisfactorily warmed up, so that a large current when the PTC heaters 22a and 22b are energized can be satisfactorily suppressed.

Further, according to this embodiment, the heat storage heater 2 is used.
5 is energized to heat the heat storage body 24, and when the temperature of the heat storage body 24 reaches a predetermined temperature (120 ° C.), the heat storage heater 25 is controlled to keep the heat storage state, and after the drying operation is started, PTC is performed.
When the heaters 22a and 22b are energized, the heat retention state is released, so that the heat storage body 24 can be always kept in the heat storage state and the PTC heater 2
It is possible to reduce power consumption when energizing 2a and 22b.

Further, according to this embodiment, since the heat storage and the heat retention are controlled after the completion of the drying operation, the heat storage body 24 can always be kept in the heat storage state at the start of the drying operation, which is convenient.

FIG. 6 shows a second embodiment of the present invention, in which the following points are different. Steps R1 to R4 are the same as steps S1 to S4 of the first embodiment, but in step R5, it is judged whether or not this drying operation is the first one, that is, whether it is a repeated operation or not. Is done. If it is the first time, the process proceeds to steps R6 to R15. The steps R6 to R15 are the same controls as the steps S5 to S14 of the first embodiment.
If the drying operation is the second time or later (“N” in step R5), the process proceeds to step R16 to determine whether the temperature of the heat storage body 24 is equal to or higher than a predetermined temperature (120 ° C.), and is lower than the predetermined temperature. When (NO in step R16), the heat storage heater 25 is energized and the motor 9 is energized (step R17). When the temperature is equal to or higher than the predetermined temperature (step S16 "Y"), the heat storage heater 25 is energized. Without doing so, the motor 9 is energized (step R18).

After this, when 30 minutes have passed from the start of the drying operation (determined in step R19), the PTC heater 22
a and 22b are energized, and the detected temperature t of the heat storage body 24 is 120
When the temperature is higher than or equal to the temperature (determined in step R21), the heat storage heater 25 is turned off (step R22), and the process proceeds to step R9 described above.

According to such a second embodiment, the following effects can be obtained. That is, when the drying operation is completed, the heat of the heat storage body 24 is considerably released (about 40%).
˜50 ° C.), in this case, it is preferable to uniquely perform heat storage and heat retention control in the heat storage body 24 after completion of the drying operation. However, this requires time for the heat storage and heat retention control after the drying operation, and thus it is inconvenient to continuously perform the next drying operation within a short time after the completion of the drying operation.

According to the second embodiment, however, when the drying operation is repeated, the heat storage heater 25 is not energized when the temperature of the heat storage body 24 is equal to or higher than the predetermined temperature, and is lower than the predetermined temperature. Since the heat storage heater 25 is turned off when 25 is energized and then reaches the predetermined temperature, even if the drying operation is continuously started within a short time after the end of the previous drying operation. Immediately, at the start of the drying operation of this time, the drying chamber 4 is heated by the heat of the heat storage device 23.
Even if the PTC heaters 22a and 22b are energized after a predetermined time from the start of the drying operation, a large current does not flow to the PTC heaters 22a and 22b. As a result, it is possible to continuously perform the drying operation within a short period of time while preventing the power breaker from operating.

Next, FIGS. 7 and 8 show a third embodiment of the present invention, which is different from the first embodiment in the following points. In the flowchart of FIG. 7, steps P1 to P7 are the same as steps S1 to S7 of the first embodiment, but in step P8, the drying rate based on the drying rate signal Sk is the predetermined drying rate Ka. It is determined whether or not the lower stage drying rate Kb (for example, 60 to 70%) set lower is reached, and if it is reached, the PTC is determined in step P9.
The heaters 22a and 22b are cut off. After that, when the predetermined drying rate Ka is reached (determined in Step P10), Step P
As shown in Steps 11 to P14, when the time Ta elapses and further 10 minutes elapses from this time point, the motor 9 is turned off as shown in Step P15, and then in Step P16 to Step P18, the first The heat storage and heat retention control is executed in the same manner as in steps S15 to S17 of the embodiment.

The curve Q in FIG. 8 shows the change in the exhaust temperature from the drying chamber 4a, in other words, the change in the hot air temperature. As can be seen from the figure, the drying rate from the start of the drying operation is the pre-stage drying rate Kb. Until (60 to 70%) is reached, the material to be dried is dried by the hot air that has become hot due to the heat generation of the PTC heaters 22a and 22b, and when the pre-stage drying rate Kb is reached, only the heat of the heat storage body 24 is used. As hot air is generated, the temperature of the hot air drops.

In the third embodiment, when the drying rate reaches the pre-stage drying rate Kb (60 to 70%), the heat generation of the PTC heaters 22a and 22b is stopped, and then only the heat of the heat storage body 24 is applied. Since the hot air is generated, it is possible to prevent the cloth from shrinking and prevent the texture from being deteriorated. That is,
When drying the material to be dried, if it is a hydrophilic fiber such as natural fiber, the water not contained in the fiber evaporates first, and then the water contained in the fiber moves to the outside of the fiber and evaporates. . The drying rate of the material to be dried when such movement of water occurs is approximately 60 to 70%. Up to this drying rate of 60 to 70%, it is safe to dry the material to be dried with relatively high temperature warm air.
If the material to be dried is directly dried with warm air of a relatively high temperature after the content exceeds 0 to 70%, there is a concern that the above-mentioned hydrophilic fiber may cause shrinkage of the cloth and deterioration of the texture.

In the third embodiment, however, the temperature of the hot air is lowered when the drying rate of the dried product becomes approximately 60 to 70%, so that the hot air temperature and the moisture inside the fiber are discharged to the outside of the fiber. Balances with the moving speed of the cloth, and as a result, it is possible to prevent the shrinkage of the cloth and the deterioration of the texture.

[0043]

As is apparent from the above description, the present invention can obtain the following effects. According to the invention of claim 1, the main heater heats the air supplied to the drying chamber by the heat of the heat storage body in a disconnected state until a predetermined time elapses from the start of the drying operation, and then the main heater Since the air is heated by heat generation of the main heater and heat of the heat storage body by energization, it is possible to prevent a large current from flowing through the main heater. Therefore, it is safe to increase the rated capacity of the main heater. The amount of heat generated by the main heater can be increased,
Therefore, it is possible to shorten the drying time while preventing the power breaker from operating.

According to the second aspect of the invention, since the heat storage device is provided on the upstream side of the main heater in the ventilation passage, the wind warmed by the heat storage body of the heat storage device can pass through the main heater. Therefore, it is possible to favorably suppress a large current when the main heater is energized.

According to the invention of claim 3, the heat storage control means controls the heat storage heater by energizing the heat storage heater to heat the heat storage body and controlling the heat storage heater when the temperature of the heat storage body reaches a predetermined temperature. Since the heat retention state is set and this heat retention state is canceled when the main heater is energized after the start of the drying operation,
The heat storage body can always be kept in a heat storage state,
Power consumption can be reduced when the main heater is energized.

According to the invention of claim 4, after the drying operation is finished, the heat storage control means is energized to heat the heat storage heater to heat the heat storage body, and when the temperature of the heat storage body reaches a predetermined temperature, the heat storage body is stored. Since the heater is controlled to be in the heat retention state, the heat storage body can always be kept in the heat storage state at the start of the drying operation, which is convenient.

According to the invention of claim 5, when the drying operation is repeated, the heat storage heater is not energized when the temperature of the heat storage body is equal to or higher than a predetermined temperature, and when the temperature is lower than the predetermined temperature. Since the heat storage heater is turned off when the heater is energized and then reaches the predetermined temperature, it is possible to continuously perform the drying operation in a short time without operating the power breaker. it can.

[Brief description of drawings]

FIG. 1 is a block diagram of an electrical configuration showing a first embodiment of the present invention.

[Fig. 2] Vertical side view of the dryer

FIG. 3 is a vertical sectional side view of the heat storage device.

FIG. 4 is a flowchart showing control contents.

FIG. 5 is a diagram showing how the temperature of the warm air changes and how the current of the PTC heater changes.

FIG. 6 is a view corresponding to FIG. 4 showing a second embodiment of the present invention.

FIG. 7 is a view corresponding to FIG. 4, showing a third embodiment of the present invention.

FIG. 8 is a diagram showing how the exhaust temperature changes.

[Explanation of symbols]

4 is a drum, 4a is a drying chamber, 9 is a motor, 11 is an air supply device, 14 is a fan, 15 is a duct (ventilation path), 22
a and 22b are PTC heaters (main heaters), 23 is a heat storage device, 24 is a heat storage body, 25 is a heat storage heater, 28 is a heat storage temperature sensor, and 33 is a microcomputer (heat storage control means, operation control means).

Claims (5)

[Claims] 1. A fan for supplying air into a drying chamber in which an object to be dried is housed, a main heater provided in an air passage to the drying chamber and having a positive temperature characteristic, a heat storage body and the heat storage body. A heat storage device configured to have a heat storage heater for heating and provided in a ventilation path to the drying chamber, a heat storage control unit that controls the heat storage heater to bring the heat storage body into a heat storage state, and a drying operation start The main heater is in a power-off state until the predetermined time elapses and heats the air supplied to the drying chamber by the heat of the heat storage body, and then the main heater is energized to generate heat and the main heater. A dryer comprising: an operation control unit that controls the air to be heated by the heat of the heat storage body. 2. The dryer according to claim 1, wherein the heat storage device is provided upstream of the main heater in the ventilation passage. 3. The heat storage control means energizes the heat storage heater to heat the heat storage body, and when the temperature of the heat storage body reaches a predetermined temperature, controls the heat storage heater to keep the heat storage state and starts a drying operation. The heat retaining state is released when the rear main heater is energized.
Dryer as described. 4. The heat storage control means energizes the heat storage heater to heat the heat storage body after the completion of the drying operation, and when the temperature of the heat storage body reaches a predetermined temperature, controls the heat storage heater to maintain a heat retention state. The dryer according to claim 1, characterized in that 5. The heat storage control means, when the drying operation is repeated, does not energize the heat storage heater when the temperature of the heat storage body is equal to or higher than a predetermined temperature, and turns on the heat storage heater when the temperature is lower than the predetermined temperature, and thereafter The dryer according to claim 1, wherein the heat storage heater is turned off when a predetermined temperature is reached.