JPH0632079Y2 - Dryer - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a dryer for clothes and the like.

[Prior art]

Conventionally, there are two types of dryers, which are an internal circulation type and an intake / exhaust type, which are described below, for drying clothes by sending air heated by a heater into a drum.

That is, in the internal circulation type dryer, the high-humidity recirculated air that has passed through the drum is cooled and condensed by an air-cooled or water-cooled heat exchanger to be dehumidified, and then this dehumidified air is heated by a heater. The clothes are sent into the drum to dry clothes and the like in the drum.

In addition, in the intake / exhaust type dryer, the above-mentioned heat exchanger is not used, the above-mentioned recirculated air is directly discharged to the outside of the refrigerator, and the air newly sucked from the outside is heated by a heater and sent to the inside of the drum. The clothes inside are dried.

[Problems to be solved by the device]

The conventional in-compartment circulation type dryer described above has an advantage that humidity does not leak out of the apparatus because the drying is performed in the closed cycle of the in-compartment circulation although there is some variation due to the heat exchange capacity of the heat exchanger. On the other hand, however, the drying efficiency is generally inferior to that of the above-mentioned suction / discharging type, and the time required for drying is generally long.

Further, in the conventional suction / exhaust type dryer, the time required for drying is shorter than that in the internal circulation type, but since high-humidity air is directly discharged into the room, there is a problem that dew condensation occurs in each part of the room. there were.

Therefore, according to the present invention, by utilizing the advantages of each of the above-mentioned internal circulation type and the above-mentioned intake / exhaust type dryer, it is possible to prevent condensation in the room and to dry clothes etc. in a shorter time than the internal circulation type. The purpose of the present invention is to provide a dryer having the above structure.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a dryer for sending clothes heated air into a drum to dry clothes and the like. After cooling and condensing with a heat exchanger to dehumidify, the dehumidified air is heated by the heater and sent to the inside of the drum, and the circulating air is directly sent to the outside of the refrigerator without passing through the heat exchanger. Switching valve means for switching between an outside air intake / exhaust path for discharging and sucking new air, heating it by the heater, and sending it into the drum; and a first temperature sensor for detecting the temperature of the recirculated air flowing back from the drum. 2 with a second temperature sensor that detects the temperature of the air in the internal circulation path before being heated by the heater
Dry state detecting means for detecting the dry state of clothes and the like in the drum based on the temperature difference detected by the two temperature sensors, and the switching valve means driven in response to a detection signal from the dry state detecting means to drive the temperature difference. Is a predetermined value or less during the dry finishing period, the route of the recirculated air is switched to the internal circulation path, and from the dry finishing period state in which the temperature difference exceeds the predetermined value, the route switching control means is switched to the outside intake / exhaust route. It is comprised as a dryer characterized by including and.

[Action]

The switching valve means is driven by the path switching control means according to the degree of drying of the material to be dried detected by the dry state detecting means. As a result, at the start of high-humidity drying, an internal circulation path is used to dry until the humidity drops to a certain degree.
After that, at the stage of finish drying, the intake / exhaust path outside the refrigerator is switched to, and efficient drying is performed.

Therefore, it is possible to obtain a sufficiently dried laundry in a relatively short time without causing dew condensation in the room.

As described above, according to the present invention, it is possible to obtain a dryer that takes advantage of the advantages of the conventional internal circulation type that has the advantage of preventing indoor dew condensation and the conventional external intake and exhaust type that has the advantage of shortening the drying time. it can.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following embodiments are examples of embodying the present invention and are not of the nature to limit the technical scope of the present invention.

FIG. 1 is a block diagram of a dryer according to an embodiment of the present invention,
FIG. 2 is an explanatory graph showing an example of a change in the dry state by the dryer, FIG. 3 is a flowchart showing a processing procedure of the dryer, and FIG. 4 is an example of a mechanism of a three-way valve used in the dryer. FIG.

In FIG. 1, in the dryer 1, the air heated by the heater 4 (indicated by an arrow X) is sent into the drum 3 which is rotationally driven by the drum driving motor 2, and the drum 3 is rotated.
The clothes etc. put inside are dried.

The high-humidity recirculation air indicated by the arrow Y that has passed through the drum 3 is sucked by the blower 5, further passed through the three-way valve 6, cooled and condensed by the heat exchanger 7, and dehumidified. The dehumidified air further passes through the three-way valve 8, is heated again by the heater 4 and is sent into the drum 3.

The above-mentioned air flow path is the in-compartment circulation path. During this time, the solenoid SLD of the three-way valve 6 is, for example, in the OFF state (a and c are in the conduction state in this figure) as shown in FIG. .

Since the same applies to the three-way valve 8, the description is omitted.

Further, if the solenoid SLD of the three-way valve 6 is, for example, in an on state (a and b are in a conducting state in this figure), the recirculation air sucked by the blower 5 passes through the three-way valve 6 and is returned to the first position.
As indicated by an arrow Za in the figure, the heat is not directly passed through the heat exchanger 7 but directly discharged to the outside. At this time, the 3-way valve 8 is also switched,
Fresh air is sucked from the three-way valve 8 as shown by an arrow Zb, heated by the heater 4, and fed into the drum 3.

The above-mentioned path that causes the flow of air is the outside-compartment suction / discharge path.

Therefore, the internal circulation path and the external intake / exhaust path can be easily switched by turning on / off the solenoid SLD of the three-way valves 6 and 8.

The three-way valves 6 and 8 for realizing the above-mentioned function of switching between the internal circulation path and the external intake / exhaust path is an example of the switching valve means in the present invention.

The dry state of the clothes and the like in the drum 3 is detected by the temperature sensors 9 and 10 including, for example, thermistors.

That is, the temperature sensor 9 detects the state of the circulating air, and the temperature sensor 10 detects the state of the air before being heated by the heater 4.

Then, at the time of the internal circulation path, the temperature sensor 9
When the difference between the recirculated air temperature t ₁ shown in FIG. 2 detected by the temperature sensor 10 and the pre-heater air temperature t ₂ detected by the temperature sensor 10 exceeds, for example, a predetermined temperature ΔT, the controller 11 controls the clothes, etc. Is determined to be in a predetermined dry state.

The detection of the predetermined dry state based on the predetermined temperature ΔT is equivalent to detecting the state of the clothes or the like during the dry finishing period.

The temperature sensors 9 and 10 that realize the function of detecting the dry state of clothes and the like in the drum 3 described above are an example of the dry state detecting means in the present invention.

Then, the solenoid SLD of the three-way valves 6 and 8 is turned on and off by a valve switching command output from the control unit 11 in response to the detection signal of the predetermined dry state based on the predetermined temperature ΔT, and the path of the recirculated air is the above-mentioned. It is switched between the in-compartment circulation path and the outside-compartment suction / discharge path.

Therefore, for example, when the clothes are wet and in an initial dry state, the temperature difference between t ₁ and t ₂ is equal to or less than the predetermined temperature ΔT, and therefore it is determined that the predetermined dry state is not reached yet, and the solenoid SLD of the three-way valves 6 and 8 is turned off. Keeping the above condition and continuing to dry the clothes, etc. by the circulation route in the refrigerator. In this state, moisture does not leak into the room as in the case of the conventional internal circulation type, so that dew condensation does not occur in the room.

Then, clothes etc. are dried to some extent, and t
_When the temperature difference between ₁ and t ₂ increases and exceeds the predetermined value ΔT, it is considered that the dry finishing stage state has been reached, and the three-way valves 6 and 8 are turned on and switched to the outside-compartment suction / discharge path.

In this state, new dry air is sucked in from the outside of the refrigerator and heated by the heater 4 to be supplied to clothes and the like, and moist high-temperature air is discharged to the outside of the machine. The clothes can be dried in a shorter time than the machine.

Further, at this time, the clothes and the like are in the state of the dry finishing period due to the drying already performed in the inside circulation path, and the moisture content of the clothes and the like is small, so that the air discharged from the dryer is Contains only a small amount of water.

Therefore, it is possible to make it difficult for indoor dew condensation to occur.

The valve device (three-way valve 6, 8) is driven according to the detection signal from the temperature sensor 9, 10 or the like described above, and the route of the recirculated air is provided between the internal circulation route and the external intake / exhaust route. The means for realizing the switching function is an example of the path switching control means in the present invention.

Next, with reference to FIG. 3, the drying process procedure of the dryer 1 will be described in the order of steps S1, S2, ....

When clothes or the like are put into the drum 3 of the dryer 1 and a predetermined start operation is performed by, for example, a start switch (S1), the drum drive motor 2 is driven and the drum 3 starts rotating (S2).

Then, the operation of the blower 5 is started (S3), the heater 4 is further energized (S4), and the drying of the clothes and the like by the circulation path in the refrigerator is started.

Then, when the temperature difference between the recirculated air temperature t ₁ detected by the thermistors 9 and 10 and the pre-heater air temperature t ₂ becomes equal to or more than the predetermined temperature ΔT, it is determined that the clothes and the like are in a predetermined dry finish period. A determination is made (S5), and the process proceeds to the next step.

In the next step S6, the solenoid SL of the three-way valves 6 and 8
When D is turned on together, the circulation air path is switched from the in-compartment circulation path to the outside-compartment intake / exhaust path, and clothes and the like are further dried.

Then, when the reflux air temperature t ₁ exceeds a predetermined constant temperature T ₂ (S7), the controller 11 determines that the drying of the clothes and the like is completed, and the heater 4 is de-energized (S8).

Further, the drum drive motor 2 is stopped (S9), and the operation of the blower 5 is also stopped (S10).

Then, the solenoids SLD of the three-way valves 6 and 8 are both turned off, and the return air path is returned to the original internal circulation path (S11).

As described above, when the clothes are wet and dry in the initial state, the clothes are dried in the internal circulation path, and when the clothes are in the dry finishing state, the clothes are sucked and discharged outside the room. Etc. are dried.

Therefore, it is possible to prevent indoor dew condensation, and it is possible to dry the clothes and the like in a shorter time as compared with a conventional in-compartment circulation type dryer.

Further, although the valve device is configured by using the three-way valves 6 and 8, it may be configured by using another valve, for example, a two-way valve or a four-way valve, and the drive system thereof is not the solenoid system. Alternatively, a motorized valve system may be used.

[Effect of device]

According to the present invention, in a dryer for sending air heated by a heater into a drum to dry clothes or the like, the humidified recirculated air which is provided in the dryer and passed through the drum is cooled and condensed by a heat exchanger. After dehumidifying by dehumidification, the dehumidified air is heated by the heater and sent to the inside of the drum, and the circulating air is directly discharged to the outside of the refrigerator without passing through the heat exchanger, and fresh air is discharged. Switching valve means for switching between the outside suction / discharge path for sucking and heating by the heater and sending into the drum, dry state detecting means for detecting the dry state of clothes and the like in the drum, and detection from the dry state detecting means Provided is a dryer comprising path switching control means for driving the switching valve means in response to a signal to switch the circulation air path between an internal circulation path and an external intake / exhaust path. It is.

Therefore, according to the dry state of clothes and the like, the internal circulation path and the external intake / exhaust path can be switched, so that dew condensation is less likely to occur in the room, and in a shorter time than the conventional internal circulation dryer. It is possible to dry clothes and the like.

Further, in the dryer of the present invention, the first means for detecting the temperature of the recirculated air recirculated from the drum is used as the dry state detecting means.
Temperature sensor and a second temperature sensor that detects the temperature of the air in the internal circulation path before being heated by the heater, and the temperature difference detected by the two temperature sensors Based on the detection of the dry state of clothes in the drum based on the above, it is possible to accurately capture the dry finish period when the detected temperature difference increases, and when the dry finish period is reached, circulation in the warehouse until then The route can be smoothly switched to the outside intake / exhaust route.

[Brief description of drawings]

FIG. 1 is a block diagram of a dryer according to an embodiment of the present invention,
FIG. 2 is an explanatory graph showing an example of a change in the dry state by the dryer, FIG. 3 is a flowchart showing a processing procedure of the dryer, and FIG. 4 is an example of a mechanism of a three-way valve used in the dryer. FIG. [Description of Reference Signs] 1 ... Dryer, 3 ... Drum 4 ... Heater, 5 ... Blower 6, 8 ... 3-way valve (switching valve means) 7 ... Heat exchanger 9, 10 ... Temperature sensor (dry state detecting means) 11 … Control unit

Claims (1)

[Scope of utility model registration request] 1. A dryer for feeding clothes heated by a heater into a drum to dry clothes and the like. The high-concentration reflux air, which is provided in the dryer and has passed through the drum, is cooled and condensed by a heat exchanger. After being dehumidified, the dehumidified air is heated by the heater and sent to the inside of the drum, and the circulating air is directly discharged to the outside of the refrigerator without passing through the heat exchanger, and fresh air is supplied. A switching valve means for switching between an outside air intake / exhaust path for sucking air, heating it by the heater and sending it into the drum; and a first detecting the temperature of the recirculated air flowing back from the drum.
Of the clothes in the drum based on the temperature difference between the temperature sensor of No. 2 and the second temperature sensor that detects the temperature of the air in the internal circulation path before being heated by the heater. A dry state detecting means for detecting the state, and the switching valve means driven in response to a detection signal from the dry state detecting means, and a path of the recirculation air until the state of the dry finishing period in which the detected temperature difference is a predetermined value or less. And a path switching control means for switching from the drying finish period state in which the detected temperature difference exceeds a predetermined value to the outside intake / exhaust path.