JP6994355B2 - How to operate the laundry dryer - Google Patents

Description

The present invention relates to an operation method of a laundry dryer that dries the washed and dehydrated laundry contained in the laundry accommodating area with heated air, and has a set value set when the laundry dryer is operated. It is about how to change.

In commercial laundry facilities that mainly wash linen products in hotels and hospitals, the operating conditions are empirically determined according to the type of laundry such as sheets or towels and the amount of laundry to be processed at one time. It is set and operated. If the washing facility is a dryer that dries the laundry in the drum by passing dry air heated by a heater through a rotating drum that houses the laundry after washing with water and dehydration, the dry air at the inlet and outlet of the drum The operation is performed by setting the set values based on experience such as the temperature, the air volume of the dry air passing through the drum, the number of rotations of the rotating drum, the timer for judging the end of drying, and the outlet temperature of the dry air.

These set values are not necessarily constant throughout the drying operation, and as shown in FIG. 9, for example, the set values of the rotation speed of the blower that sends dry air are gradually lowered every time the set time elapses. Controls such as reducing the air volume of dry air are performed. As an example of such control, for example, in Patent Document 1, laundry drying that maintains the inlet temperature of dry air by adjusting the flow rate of steam flowing through the steam heater so that the inlet temperature of the dry air becomes a set temperature. In the method, a drying method in which the set temperature of the dry air is lowered in a plurality of stages and a drying method in which the flow rate of the dry air is reduced in a plurality of stages have been proposed.

Further, in Patent Document 2, the inlet temperature is set to a high value (for example, 120 ° C.), the operation is started while adjusting the steam valve so that the inlet temperature is maintained, and the temperature rises as the laundry dries. When the outlet temperature reaches a predetermined set value (for example, 80 ° C.), a technique has been proposed in which the setting is changed to the predetermined lower inlet temperature (for example, 100 ° C.) and the outlet temperature (for example, 60 ° C.) for operation. There is.

Further, in Patent Document 3, the rotation speed of the blower fan at the start of drying is set to be larger than the rotation speed at the end of drying, and based on the difference between the ambient temperature and the detection temperature of the outlet temperature sensor, the rotation speed is set to be larger than the rotation speed at the end of drying. A technique for controlling the timing of lowering the rotation speed of the blower fan from the one at the start of drying to the one at the end of drying has been proposed.

As described above, an operation method for changing the set values of the temperature and air volume of the dry air during the drying operation has been known, but conventionally, the set values are changed stepwise, that is, during the preset operation. At the timing of, or when the temperature of the dry air detected by the temperature sensor reaches a predetermined temperature, the rotation speed of the blower fan is changed to the predetermined constant rotation speed after the change, or the dry air When the detection value of the temperature sensor that detects the temperature reaches a predetermined temperature, the set value of the temperature of the dry air is changed to a predetermined fixed value, and the rotation speed of the blower and the steam flow rate of the steam heater are changed. The setting value of was changed.

Japanese Unexamined Patent Publication No. 2007-61411 Jitsukaihei 1-104997 Gazette Japanese Unexamined Patent Publication No. 2010-259852

Laundry has different drying methods depending on the type (mainly fiber material, fabric thickness, weaving method). For example, sheets and pillowcases dry quickly, towels with good water absorption dry slowly, and towels and bath mats dry even more slowly. Therefore, the speed of drying and the progress of drying differ depending on what kind of laundry is contained in the laundry put into the dryer and in what proportion. In addition, the progress of drying may be slowed down depending on the amount of laundry put in.

Therefore, the control that changes the set value at a predetermined timing after starting the operation of the dryer cannot cope with the slow speed of drying, and when the drying progresses quickly, the setting change is delayed and the amount of heat of the heater is increased. If waste occurs and the progress of drying is slowed down, the setting change is performed too quickly and it takes time to dry, resulting in variations in drying quality and drying time.

On the other hand, it is considered that the method of changing the set value when the outlet temperature of the dry air reaches a predetermined set value can be controlled according to the progress rate of drying. The detected value of is not always constant with the progress of drying, but is accompanied by changes such as pulsation.

For example, in a dryer that scoops up laundry with a rotating drum and passes dry air through the falling laundry to dry it, a certain amount of laundry is not always dropped, and the amount of dropped laundry is not always dropped due to uneven distribution of laundry. It increases and decreases. In such a case, the outlet temperature and the air volume of the dry air may pulsate due to the amount of the falling laundry, and the detected value may temporarily fluctuate greatly due to the delay in controlling the heater.

That is, for example, in the method of gradually changing the set value when the outlet temperature of the dry air reaches a predetermined temperature, the timing of changing the set value may be shifted due to a temporary fluctuation of the detected temperature. Even if the setting is changed at an inappropriate timing, the changed setting value is maintained after that, so the waste of heat source and the delay of drying time due to the setting change at the inappropriate timing are repaired. Not done.

The present invention has been made in view of the above problems, and is a detection value of a monitoring target (inlet temperature sensor 31 or outlet temperature sensor 32 detected as an inlet temperature of dry air) which is a trigger (index) for changing a set value. Even if the set value of the controlled object is changed at an inappropriate timing due to temporary fluctuations (such as the outlet temperature and the temperature of the laundry detected by the infrared sensor), heat wasted and dried due to the timing error. It is an object of the present invention to provide a method capable of efficiently drying under appropriate conditions in which the delay is repaired and the temperature changes according to the progress of drying of the laundry.

In the present invention, the control target is controlled so as to maintain the initial set value (hereinafter referred to as "constant control"), the drying operation is started, and the detection value of the monitoring target is a predetermined trigger during the drying operation. In the operation method of the laundry dryer that changes the initial setting value when the value is reached and controls the control target with the changed setting value, the changed control target setting value (hereinafter, "changed setting value") It is a method of operating a laundry dryer that changes (increases or decreases in the same direction as or in the opposite direction to the increase or decrease of the monitored object) so as to follow the change of the detected value of the monitored object after the change.

The monitoring target is the inlet temperature and outlet temperature of the dry air A passing through the laundry storage area (rotating drum 12 and the like), the temperature of the laundry in the storage area detected by the infrared sensor and the like. The control targets are the air volume of the dry air and the heating means of the heater for heating the dry air (means for controlling the pressure and flow rate of steam supplied to the steam heater, the electric power supplied to the electric heater, the circulation amount of the refrigerant of the heat pump, etc.). The rotation speed of the rotary drum 12, the exhaust circulation rate (the ratio of returning the dry air that has passed through the storage area of the laundry to the air flow path before passing through), and the like.

A preferable means for changing the changed set value so as to follow the detected value of the monitored target is a control for changing the initial set value and trigger value of the controlled target and the constant control so as to follow the detected value of the monitored target (hereinafter,). One or more set values after shifting to "variation control") The detected value of the monitoring target at the specified points P1 and P2 and the changed set value are registered in the controller and changed from these registered values. It is a means to obtain the changed setting value for the detected value of the monitoring target after the above is performed.

In the above means, the controller 4 calculates the changed setting value by a relational expression connecting the setting change point P0 and one or a plurality of setting value designation points P1 and P2 with a polygonal line or a curve. According to such means, the changed setting value can be registered by the same operation as the conventional stepwise changing setting value, and the process for continuously changing the changed setting value is also easy. become.

There are many control targets that set set values when the laundry is dried, and there are also many monitoring targets. Therefore, there are many combinations of control targets and monitoring targets that serve as indicators for changing the set values. A plurality of setting devices 42, 43, 44 for changing the setting value of the control target based on the detected value of the monitoring target are provided, and changeover switches 47, 48, 49 for enabling or disabling the setting value changing operation of each setting device are provided. By doing so, it is possible to select which control target and which monitoring target to change the set value according to the type and amount of laundry, or the environmental conditions such as the temperature and outside air humidity when washing, and optimal drying. You can drive.

In the laundry dryer, the change in the outlet temperature of the dry air to be monitored may become unstable for a while (usually several minutes) after the operation is started. When there is a possibility that such a phenomenon may occur, it is preferable to start monitoring the monitoring target after a predetermined time has elapsed from the start of operation.

When the type of laundry to be processed and the amount of one-time input are almost constant, constant control to variable control when the elapsed time set from the start of operation elapses, regardless of the detected value of the monitored object. It is also possible to control the transition to. That is, when the set time elapses from the start of the drying operation, the control of the controlled object is switched from the constant control to the variable control.

Along with the above control, the heater that monitors both the inlet temperature and outlet temperature of the dry air to the rotating drum containing the laundry and heats the air volume of the dry air or the dry air so as not to exceed their upper limit set value. It is also possible to control the heating means.

When the detected value of the monitoring target reaches one predetermined trigger value or the first preset time elapses after the operation is started, the change of the set value of the controlled target is started. The changed set value changes according to the difference between the detected value to be monitored and the trigger value. The correspondence relationship is defined by a straight line or a curve in which the relationship between the detected value to be monitored and the set value after the change passes through the trigger value and the initial set value.

Therefore, even if the detection value of the monitoring target temporarily rises or falls and the set value of the control target is changed to the changed set value, when the detection value of the monitoring target subsequently falls or rises, the control target The set value moves in the direction of returning, that is, in the direction of the set value before the change, and returns to the state in which the set value is practically not changed. After that, if the detected value of the monitored object changes in the correct direction as the drying progresses, the set value of the controlled object also continuously changes in accordance with the change.

That is, according to the present invention, even if the set value of the controlled object is changed to the changed set value due to the temporary change of the detected value of the monitored object, the time when the temporary change of the detected value of the monitored object disappears. Then, since the set value of the controlled target returns to the appropriate set value, the changed set value due to the temporary fluctuation of the detected value of the monitored target is automatically restored.

Further, after the setting is changed, the set value of the controlled object changes to an appropriate value according to the drying of the laundry, so that the drying operation is always continued under the optimum conditions.

Therefore, according to the present invention, in the drying of laundry in which the set value of the controlled object is changed during the drying operation, the loss of heat and the delay of the drying time due to the fact that the set value is not changed at the optimum timing are caused. There is an effect that drying under optimum conditions can be realized without occurring.

Block diagram showing an example of a laundry dryer Diagram showing an example of heat source control of a heater Diagram showing the first embodiment of the setting change operation Schematic diagram showing the driving operation in the case of the first embodiment Diagram showing the second embodiment of the setting change operation Schematic diagram showing the driving operation in the case of the second embodiment Schematic diagram showing the driving operation of the third embodiment Diagram showing an example of boost control Diagram showing an example of heat source control of a conventional heater

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a main part of a dryer main body 1 and a controller 4. The dryer main body 1 includes a rotating drum 12 that rotates inside the outer body 11. The laundry W to be dried is put into the rotary drum 12, and is dried by the dry air A passing through the rotary drum 12 while being scraped up and dropped from above as the rotary drum 12 rotates.

The dry air A is a rotating drum from the suction port 13 provided on the opposite side of the outer body through the heater 14 and the suction duct 15 by the blower 17 installed in the discharge duct 16 provided in a part of the outer body 11. It flows into the 12 and is discharged from the exhaust port 18. An air return path 19 is provided between the discharge duct 16 and the suction duct 15, and a part of the exhaust gas is returned to the suction duct 15 by adjusting the opening degree of the damper 20 provided in the exhaust port 18. It has become.

A steam heater 14 is provided in the air suction port 13, and the dry air A is heated by the steam passing through the steam heater. The amount of heat supplied to the steam heater 14 is adjusted by the steam valve 24.

The rotary drum 12 is rotationally driven by the drum motor 22, and the blower blower 17 is rotationally driven by the blower motor 27. The drum motor 22 and the blower motor 27 are inverter motors, and the rotation speed can be changed by changing the frequencies of the inverters 23 and 28.

The suction duct 15 is provided with an inlet temperature sensor 31 that detects the temperature of the dry air after passing through the heater 14. The discharge duct 16 is provided with an outlet temperature sensor 32 that detects the temperature of the dry air that has passed through the rotating drum 12.

The controller 4 includes a steam valve opening degree adjuster 41, a blower rotation speed setting device 42, an exhaust circulation rate setting device 43, a drum rotation speed setting device 44, and a boost controller 45. The steam valve opening degree adjuster 41 adjusts the opening degree of the steam valve 24 based on the detected temperatures of the inlet temperature sensor 31 and the outlet temperature sensor 32.

The blower rotation speed setting device 42 controls the blower motor 27 by setting the rotation speed of the blower blower 17 based on the detection value of the outlet temperature sensor 32. The exhaust circulation rate setting device 43 adjusts the opening degree of the exhaust damper 20 based on the difference between the detection value of the inlet temperature sensor 31 and the detection value of the outlet temperature sensor 32, and controls the amount of exhaust gas returned to the suction duct 15. is doing. The drum rotation speed setting device 44 sets the rotation speed of the rotating drum 12 based on the detection signal of the outlet temperature sensor 32, and controls the drum motor 22 based on the set value.

When the detection value Ts of the outlet temperature sensor 32 deviates from the target value Tt by a threshold value or more at a predetermined monitoring timing t, the boost controller 45 brings the outlet temperature closer to the target value Tt. Temporarily change the rotation speed. When the set value of the blower rotation speed setting device 42 and the command value of the boost controller 45 are different, the command value of the boost controller 45 is prioritized by the selector 46 to drive the blower motor 27.

The controller 4 has changeover switches 47, 48, which select whether to enable or disable the setting change operation of the blower rotation speed setting device 42, the exhaust circulation rate setting device 43, and the drum rotation speed setting device 44. 49 is provided.

The steam valve opening adjuster of this type of conventional dryer is adjusted either based on the detection value of the inlet temperature sensor 31 or based on the detection value of the outlet temperature sensor 32. For example, when the laundry is a towel, the opening degree of the steam valve 24 is adjusted so that the detection value of the inlet temperature sensor 31 is maintained at a constant Tit (FIG. 2-a), and the laundry is a bath mat. The control was performed such that the opening degree of the steam valve 24 was adjusted so that the detected value of the outlet temperature sensor 32 was maintained at a constant Tdt (Fig.-B).

However, when controlled only by the inlet temperature, if the drying progresses quickly, the outlet temperature may rise more than necessary (Fig. C), and the exhaust gas at a higher temperature than necessary will be discharged. , The problem of large heat loss arises. On the other hand, when controlled only by the outlet temperature, the outlet temperature does not rise easily for slow-drying materials such as bath mats (Fig.-D), and the inlet temperature rises excessively in order to raise the outlet temperature to the set value. There was a problem (Fig.-E).

The steam valve opening adjuster 41 in FIG. 1 adjusts so that the detected value Ti of the inlet temperature sensor 31 and the detected value Td of the outlet temperature sensor 32 do not exceed the respective set values. In addition, when the drying is fast, the outlet temperature Td quickly reaches the set value Tdt (Fig. 2-b), and the drying is performed in a state where the inlet temperature Ti is low. When Ti reaches the set value Tit first (Fig. 2-a), the inlet temperature can be prevented from rising excessively, and in any case, the excessive temperature rise can be prevented, resulting in unnecessary heat loss. It has the characteristic that it can be prevented.

The blower rotation speed setting device 42, the exhaust circulation rate setting device 43, and the drum rotation speed setting device 44 are controlled by the method of the present invention. First, the blower rotation speed setting device 42 will be described with reference to FIGS. 3 and 4.

The blower rotation speed setting device 42 has an initial value of 100% of the blower rotation speed to be controlled, a trigger value T0 of the outlet temperature to be monitored, an outlet temperature T1 at the first set value designated point P1, and a set value after the change. It is provided with a memory for registering 90%, the outlet temperature T2 at the second set value designated point P2, and the changed set value 80%.

Further, in the blower rotation speed setting device 42, the initial value 100% of the registered blower rotation, the trigger temperature T0, the detection value T1 at the first set value specified point P1, the changed set value 90%, and the second set value specified point An arithmetic expression for calculating a curve K (FIG. 3) that smoothly connects the detected value T2 in P2 and the changed set value 80% is registered.

Next, the operation (FIG. 4) when the blower rotation speed setting device 42 is enabled will be described. The controller 4 first sets the blower rotation speed to 100% of the initial rotation speed and starts the drying operation. As the laundry dries, the outlet temperature gradually rises. When the detection value of the outlet temperature sensor 32 reaches the trigger value T0 in the middle of the drying operation, it corresponds to the detection value of the outlet temperature sensor 32 at that time based on the relationship between the outlet temperature and the blower rotation speed of the above-mentioned calculation formula. The number of rotations of the blower is calculated, and the number of rotations of the blower at that time is given to the inverter 28 of the blower motor 27.

That is, when the drying progresses from the start of the drying operation and the outlet temperature of the dry air (detected temperature of the outlet temperature sensor 32) reaches the trigger value T0, the control is performed from the constant control of the initial rotation speed of 100% to the outlet temperature and the blower. It switches to fluctuation control according to the arithmetic formula that defines the relationship of the number of rotations. Therefore, for example, when the detection value of the outlet temperature sensor 32 decreases after reaching the trigger value T0, the blower rotation speed is changed to follow the decrease of the outlet temperature. Generally, after the blower rotation speed is changed from the constant control to the fluctuation control according to the curve K based on the above calculation formula, the blower rotation speed continuously decreases as the outlet temperature rises. Drying is completed in that state.

According to such control, even if the blower rotation speed is changed by the temporary increase in the outlet temperature, the blower rotation speed is changed to be low when the temporary increase in the outlet temperature is restored to the original value. It is no longer maintained at the value, and an appropriate blower rotation speed according to the outlet temperature is maintained. Further, since the blower rotation speed changes continuously according to the change of the outlet temperature, efficient and stable drying can be realized.

When the blower rotation speed setting device 42 is disabled, the blower rotation speed is maintained at a constant rotation speed set by the initial setting value from the start to the end of the drying operation.

In the above example, the set value of the control target after changing the set value is controlled so as to be on a smooth curve passing through a plurality of set value specified points P1 and P2. The set value of the controlled object may be changed by a straight line connecting the two. An example of linearly changing the changed set value by taking the exhaust circulation rate setting device 43 as an example will be described with reference to FIGS. 5 and 6.

In the exhaust circulation rate setting device 43, the initial opening degree of the damper 20 to be controlled is 100% (fully open, the exhaust circulation rate is 0%), and the inlet / outlet temperature difference which is the difference between the inlet temperature Ti and the outlet temperature Td to be monitored. Trigger value ΔT0 of ΔT = Ti-Td, inlet / outlet temperature difference ΔT1, ΔT2 at the first set value specified point P1 and the second set value specified point P2, and the set value of the damper opening that realizes the exhaust circulation rate of 20% and 40%. It has a memory to register with.

Further, when the detection value of the inlet / outlet temperature difference is the temperature difference between the set change point P0 and the set value designation points P1 and P2 registered in the exhaust circulation rate setting device 43, the detected temperature difference is present. An interpolation calculation formula is registered in which the exhaust circulation rate corresponding to is interpolated by a straight line L (FIG. 5) connecting the exhaust circulation rates of the setting change points P0 on both sides thereof and the set value designation points P1 and P2.

Next, the operation when the exhaust circulation rate setting device 43 is enabled will be described. The controller 4 sets the damper opening to the fully open position (exhaust circulation rate 0%) and starts the drying operation. As the drying of the laundry progresses, the temperature difference ΔT between the inlet and outlet of the dry air gradually decreases. If the difference ΔT between the detected values of the outlet temperature sensor 32 and the inlet temperature sensor 31 drops below the trigger value ΔT0 during the drying operation, the damper opening corresponding to the detected temperature difference at that time is interpolated and the damper 20 is calculated. The set value of the opening degree of is taken as the damper opening degree calculated by interpolation at that time.

That is, as shown in FIG. 6, the drying operation is started with the damper opening set to 100%, the drying progresses, and the inlet / outlet temperature difference ΔT of the dry air is the trigger value ΔT0 and the inlet / outlet temperature at the first set value designated point P1. When the temperature difference is between the difference ΔT1, the damper opening is linearly interpolated from the registered values of the inlet / outlet temperature difference and the damper opening of the setting change point P0 and the set value designation points P1 and P2 from the constant control. It switches to the fluctuation control.

Therefore, between the setting change point P0 and the last set value designation point P2, the damper opening is changed to follow the decrease in the temperature difference between the inlet and outlet of the dry air, and the drying returns from the discharge duct 16 to the suction duct 15. The amount of air increases as the temperature difference between the inlet and outlet decreases. In the example of the figure, after the lapse of the last set value designated point P2, the control is such that the damper opening designated at the last set value designated point is kept constant until the end of drying.

According to such control, even if the damper opening is changed due to a temporary rise in the outlet temperature of the dry air, the exhaust circulation rate is changed when the temporary rise in the outlet temperature is restored. It is no longer maintained at a high value, and an appropriate exhaust circulation rate according to the temperature difference between the inlet and outlet is maintained. Further, since the exhaust circulation rate changes according to the change in the temperature difference between the inlet and the outlet, efficient and stable drying can be realized.

When the exhaust circulation rate setting device 43 is disabled, the damper opening degree is maintained at full throttle (exhaust circulation rate 0%) from the start to the end of the drying operation.

In the above example of the blower rotation speed setting device 42 and the exhaust circulation rate setting device 43, the detection value of the monitoring target and the changed setting value of the control target are controlled in a one-to-one relationship. Depending on the situation, it may be desired to change the set value of the controlled object after changing the setting. An example of such control will be described with reference to FIG. 7 by taking a setting change operation of the drum rotation speed setting device 44 as an example.

The drum rotation speed setting device 44 of FIG. 7 changes the set value of the drum rotation speed, which is the control target, by monitoring the outlet temperature. When drying is performed while maintaining the inlet temperature constant, the outlet temperature rises as the drying progresses. When drying laundry with thin and light fabrics, the laundry tends to spread as the drying progresses, so it is better to increase the drum rotation speed in order to spread a lot of laundry in the drum and promote drying. desirable. On the other hand, in the case of laundry made of thick and heavy fabric, it is preferable to reduce the drum rotation speed in order to prevent the laundry from being easily peeled off from the drum peripheral surface due to centrifugal force.

In order to realize the above control, the setting change point P0 on the drum rotation speed setting device 44, the multiple setting value designation points P1 and P2 adopted when the laundry fabric is light, and the setting adopted when the fabric is heavy. Register the value specification points Q1 and Q2. Then, the drum rotation speed is continuously controlled with reference to a curve or a polygonal line (interpolation line) connecting the setting change point P0 and the two sets of set value designation points P1, P2 and Q1 and Q2, respectively.

With reference to FIG. 7, the operation when the drum rotation speed setting device 44 is enabled will be described. In the case of laundry with a light cloth, the controller 4 specifies a speed increase change, sets the drum rotation speed to 100% of the initial rotation speed, and starts the drying operation. When the drying of the laundry progresses and the detected value of the outlet temperature sensor 32 rises to the trigger value T0 or more, the setting change point P0 and the set value specified points in the case of speed increase, P1 and P2, are changed to the outlet temperature at that time. The corresponding drum rotation speed is interpolated, and the rotation speed of the rotating drum 12 is taken as the rotation speed calculated at that time.

On the other hand, in the case of heavy laundry, the controller 4 specifies a deceleration change, sets the drum rotation speed to 100% of the initial rotation speed, starts the drying operation, and then triggers the detection value of the outlet temperature sensor 32. When the value rises above T0, the rotation speed of the rotating drum 12 is calculated by interpolating the drum rotation speed corresponding to the outlet temperature at the setting change point P0 and the setting value specification points Q1 and Q2 in the case of deceleration. It is assumed that the rotation speed is interpolated at the time point.

In each of the above examples, the set value designation points are set to two points, but the set value after the change is set by a curve that smoothly connects the registered setting change points like the blower rotation speed setting device 42 of the embodiment. When obtaining, it is necessary to register two or more set value specified points. On the other hand, when the set value of the control target is obtained by linear interpolation like the exhaust circulation rate setting device 43 and the drum rotation speed setting device 44, at least one set value designated point may be registered.

Next, the operation of the boost controller 45 will be described. In normal drying operation, the outlet temperature of the drying air gradually rises until the end of drying, as shown by the curve C in FIG. Since this curve C is empirically obtained, the target outlet temperature Tt at a predetermined timing during the drying operation can be set in the setter of the boost controller 45.

Then, in the actual operation of the dryer, the outlet temperature Ts detected by the outlet temperature sensor 32 at the designated timing t in the latter half of the drying operation is deviated from the registered target value Tt by a threshold value or more. At that time, the blower rotation speed is temporarily changed for a certain period of time to control the outlet temperature so as to approach the target temperature Tt. The timing for comparing the outlet temperature with the target temperature may be set in advance by a timer, and if necessary, the timing is compared at a plurality of timings and controlled so that the drying is completed within a desired drying time.

The target to be boosted can be a set value of the blower rotation speed, as well as a set value of the inlet temperature and the outlet temperature. With such boost control, even if the initial setting value or the set value after the change is inappropriate, the laundry can be dried within a desired drying time.

4 Controller 12 Rotating drum 42 Blower rotation speed setting device 43 Exhaust circulation rate setting device 44 Drum rotation speed setting device A Dry air P0 Setting change point P1 1st set value specified point P2 2nd set value specified point

Claims (5)

Control the control target so as to maintain the initial setting value, start the drying operation, and start the drying operation.
When the detected value of the monitoring target reaches a predetermined trigger value in the middle of the drying operation, or when a preset time has elapsed since the operation was started , the initial setting value is changed and the changed setting value is changed. It is a method of operating a laundry dryer that controls the control target with
In the operation method of the laundry dryer in which the set value of the controlled object after the change is changed in the same direction as or in the opposite direction to the direction of the change so as to follow the change of the detected value of the monitored object after the change.
The trigger value, which is the detection value of the monitoring target at the setting change point that changes the initial setting value and the setting value, and the detection value and control of the monitoring target at one or more setting value specified points after the initial setting value is changed. The target setting value is registered in the setting device, and the setting device calculates the setting value after the setting value is changed by a relational expression connecting the setting change point and one or more setting value designation points with a polygonal line or a curve. Characteristic method of operating the laundry dryer Both the inlet temperature and the outlet temperature of the dry air to the rotating drum containing the laundry are monitored, and the air volume of the dry air or the heating means of the heater for heating the dry air is controlled so as not to exceed the upper limit set value thereof. The operation method according to claim 1. The operation method according to claim 1 or 2 , wherein a plurality of setting devices for changing the setting value of the control target based on the detected value of the monitoring target are provided, and a changeover switch for enabling or disabling the setting value changing operation of each setting device is provided . .. The operation method according to claim 1 or 2, wherein the monitoring target is the temperature of the dry air that has passed through the storage area of the laundry, and the control target is the air volume of the dry air or the heating means of the heater that heats the dry air . The operation method according to claim 1 or 2, wherein the monitoring target is the temperature of the dry air passing through the rotating drum accommodating the laundry, and the controlled object is the rotation speed of the rotating drum .

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