JPH04200500A - Dryer for clothe - Google Patents

Abstract

PURPOSE:To shorten drying time by providing a sensor to detect temperature of exhaust from a drying room and a fan to control air flow rate of outside air to be supplied to a heat exchanger according to the detected exhaust temperature. CONSTITUTION:Clothes 4 to be dried is put into a tumbler 2, which is driven by a motor 3 to agitate clothes 4. Also, a circulating fan 8 is driven to circulate air in the tumbler 2, and a heater 5 is energized to start operation. After operation is started, a thermal element 7 detects temperature of circulating air Tcir exhausted from the tumbler 2. When the detected circulating air temperature Tcir is higher than a supremum set value T2, a cooling fan 10 is driven to increase the heat exchanging function of a heat exchanger 9, causing the circulating air temperature Tcir to be kept below a fixed temperature. On the other hand, when lower than a lowest limit set value T1, the cooling fan 11 is turned OFF to control the heat exchanging function of the heat exchanger 9 down, resulting in shortening of drying time at high operating efficiency.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is a method for exchanging heat between exhaust air from a drying room and outside air, cooling the exhaust air, and removing moisture contained in the exhaust air. 2. It relates to a warm air circulation type clothes dryer that reheats the initial air using a heater and supplies it to the drying chamber.

(Prior art) Generally, in the drying process of a hot air circulation type clothes dryer, high temperature and low humidity circulating air is applied to the items to be dried, and the temperature is raised to
The water vapor n4 on the surface of the object to be dried is increased, and the water vapor n4 is moved due to the water vapor pressure difference with the circulating air, so that the object to be dried is not dried. Absorbs moisture from the material to be dried (7. The temperature of the circulating air is 11) to the temperature of the river L+r. The circulating air is placed in the circulation flow path, cooled with a heat exchanger, dehumidified, and then heated with a heater to return to high humidity and low humidity. - Supply 1 - Apply the above process to the material to be dried (2). The volume of circulating air, the volume of cooling air that draws the heat exchanger, and the human power of the heater are operated at approximately constant levels regardless of the material m to be dried, that is, the cloth m.

In the drying process described in J-1, as shown in Fig. 6, the circulating air temperature at the entry point of the circulation flow path (drying run [-1)] is 11Tc i
From the start of drying to the end of drying,
That is, it is roughly divided into a heating period, a loss rate period, and a decreasing rate period. During the heating period, the material to be dried and the drying chamber are warmed up, and the circulating air temperature Tcir increases as time passes.1. =,
Eventually, the heater input and the amount of heat dissipated by the dehumidifying heat exchanger are balanced and the period shifts to a cautious period in which the circulating air temperature Te1r becomes constant. Then, near the end of drying, the balance is lost and the cycle shifts to a decreasing rate period in which the circulating air temperature Tc1r increases, and the drying process ends.

Figure 7 shows the drying cycle during the careful period. Now, if we consider the case where there is no leakage of circulating air in the circulation channel, the state of the drying air (J, Stroke (isoenthalpic change), ■-■, Water is cooled by a heat exchanger and condenses (moves on the saturation line), ■-■, Temperature rises with constant absolute humidity due to heater heating.

The effectiveness of such hot air circulation clothes dryers is limited by the fact that the input energy for one night is used for evaporating moisture from the items to be dried. Reducing the heating rate will lead to improved efficiency.

(Problem to be solved by the invention) In conventional warm air circulation type clothes dryers, the volume of circulating air,
The cooling air m for cooling the heat exchanger and the heater power are operated at a substantially constant level regardless of the amount of material to be dried, that is, the amount of cloth.

However, in this operating method, as the number of fabrics m increases, the temperature in the drying room during the constant period decreases, and the saturation curve -L in Fig. 7,
The temperature of the circulating air was high, making it impossible to operate under efficient operating conditions, resulting in long drying times. A possible solution to this problem is to increase the heater capacity. 1. However, if the heater capacity is increased, the heat exchanger capacity must also be increased in order to keep the circulating air temperature below a certain level when the amount of clothes is small, resulting in a larger clothes dryer. There is. Furthermore, it is difficult to increase the heater capacity to a constant value when considering the capacity of the commercial power source.

SUMMARY OF THE INVENTION Therefore, the present invention provides a clothes dryer that can reduce the drying time with high operating efficiency by increasing the drying room temperature to <1-2 without increasing the input power when the amount of cloth is large. The purpose is to

U Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention exchanges heat between the FA air from the drying chamber containing the material to be dried and the outside air using a heat exchanger. Cooling the exhaust gas and removing moisture contained in the exhaust gas
, a clothes dryer that reheats the exhaust gas with a heater and supplies the same to the drying chamber, a temperature sensor that detects the initial temperature from the drying chamber, and #J+ detected by the temperature sensor.
The main feature is to include a fan that controls the amount of outside air supplied to the heat exchanger according to the air temperature.

(Function) The operation of the cooling fan for air-cooling the heat exchanger is controlled according to the exhaust temperature from the drying chamber detected by the temperature sensor. As a result, the temperature of the circulating air in the drying chamber is maintained at a constant temperature that provides the best operational efficiency during the careful period, regardless of the amount of material to be dried.

As a result, even when there is a large amount of material to be dried, the temperature inside the drying chamber remains constant without increasing the heater power, and the drying time is shortened with high operating efficiency.

(Example) Hereinafter, I.-1 Examples of the present invention will be described based on the drawings.

1 to 4 are diagrams showing one embodiment of the present invention.

First, to explain the configuration of a clothes dryer using Figures 1 and 2, 1 is the main body of the clothes dryer, 2 is a rotating drum that is rotatably supported by a shaft within the main body and serves as a drying chamber, and 3 is a rotating drum. A driving motor is provided, and clothes 4 to be dried are housed in a rotating drum 2 and are agitated by the rotation of the rotating drum 2. 5 is a heater that heats the circulating air guided into the rotating drum 2; 6 is a rotating drum; a circulation duct that guides the circulating air (exhaust air) spun from 2 to the heater 5; (J) A heating element 7 is installed as a temperature sensor to detect the temperature of the exhaust gas. 8 is a circulation fan that circulates the circulating air;
9 is a heat exchanger that exchanges heat between circulating air and cooling air using outside air, and a cooling fan 10 is installed on the side of the heat exchanger 9.
or has been set up.

The cooling fan 10 is configured to control the amount of cooling air supplied to the heat exchanger 9 according to the exhaust temperature detected by the heat-sensitive element 7. Reference numeral 11 indicates an intake port 1 for cooling air, which is outside air. 12 indicates an exhaust port for cooling air. 13 indicates a train hole for introducing dehumidified water to the outside of the machine. Reference numeral 14 indicates a lid for putting in clothes provided on the front surface of the main body.

As mentioned above, the heat exchanger 9 is forced into air with cooling air whose air volume is controlled by the cooling fan 10.
A smaller size than before is used. In addition, in FIGS. 1 and 2, black arrows indicate the flow of circulating air]-7, and self-arrows indicate the flow of cooling air.

Next, the operation of the clothes dryer configured as described above will be explained using the control flowchart of FIG. 3 and FIG. 4.

Clothes 4 to be dried are put into the rotating drum 2, and the rotating drum 2 is driven by the motor 3 to agitate the clothes 4. At the same time, the circulation fan 8 is driven to circulate circulating air within the rotary tram 2, and the heater 5 is energized to start operation (step 21). After the start of operation, the circulating air temperature Te1r captured from the rotation l/ram 2
is detected by the heat sensitive element 7 (step 22). So [, 5
Then, the detected circulating air temperature Tc1r or the 1st limit set value 'r2
If the temperature is higher, the cooling fan 1 [-] is driven to enhance the heat exchange function of the heat exchanger 9, and the circulating air temperature 1゛r: i
R is suppressed to F below a certain temperature (Step: 23.24
). On the other hand, the circulating air temperature T' c i r is the lower limit set value T
, the cooling fan 10 is turned off and the heat exchange function of the heat exchanger 9 is controlled to 0 (step 25.26). In this way, the rotation of the cooling fan 10 is controlled by the circulating air temperature T c i r detected by the heat sensitive element 7, and the rotation of the cooling fan 10 is controlled by the circulating air temperature T c i r detected by the heat sensitive element 7.
As shown in FIG. 4, the temperature of the circulating air inside the tank is maintained at a temperature 'r1 to T2° C. that provides the most efficient operation during the careful period.

As a result, drying time is shortened even when the amount of cloth is large.

Next, FIG. 5 does not show other embodiments of the present invention. In this embodiment, a double-blade fan 15 which also serves as a first heat exchanger is provided in the drying room Z and at the temperature of the circulating air from the rotating drum 2. The heat exchanger 9 in the above embodiment is the second
It functions with 12 heat exchangers.

Then, the double-blade fan 15, which also serves as the first heat exchanger, circulates hot air for drying the clothes 4 and draws in outside air for cooling (1. A preliminary heat exchange between the two is performed. In the second heat exchanger 9, the same control as in the first embodiment is performed, and almost the same effects can be obtained.

[Effects of the Invention] As described in 1-1 above, according to the present invention, there is provided a temperature sensor that detects the temperature of tJ+- air from a drying chamber that accommodates objects to be dried, and an exhaust temperature detected by this temperature sensor. Since it is equipped with a fan that controls the volume of outside air supplied to the heat exchanger that cools the exhaust air according to can do.

Therefore, even when the amount of material to be dried is large, the temperature in the drying chamber can be raised to a constant temperature without increasing the heater input, and the drying time can be shortened with high operating efficiency.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the clothes dryer according to the present invention, and FIG. The figure is a block diagram of the internal structure seen from the side, and Figure 3 is a t-th flowchart explaining the A'1 operation. Figure 3 is a side view of the internal configuration of another embodiment of the present invention, and Figure 6 is a characteristic diagram showing the temporal change in circulating air temperature during drying operation of a conventional clothes dryer. Figures 1 and 7 are 4 diagrams showing the eaves lamp during the careful period of eaves lamp 1. 5. Heater, 7. Heat sensitive element (temperature sensor), 9. Heat exchanger, 10: Cooling fan.

Claims (1)

[Scope of Claims] A heat exchanger exchanges heat between the exhaust air from a drying chamber containing the material to be dried and outside air, cools the exhaust air, removes moisture contained in the exhaust air, and recycles the exhaust air with a heater. A clothes dryer that heats and supplies the clothes to the drying chamber, the clothes dryer comprising: a temperature sensor that detects the temperature of exhaust air from the drying chamber;
A clothes dryer comprising: a fan that controls the volume of outside air supplied to the heat exchanger according to the exhaust temperature detected by the temperature sensor.