JPH01175898A - Clothes dryer - Google Patents

Abstract

PURPOSE:To enable drying operation to be stopped in a desired drying rate with no influence by dispersion of ambient temperature, thermostat operating temperature, etc., by calculating the time, after detecting a fixed drying rate to the end of the operation, by an integrated value of the time in proportion to an input value of a heater. CONSTITUTION:Time t2, from time t1 after a start of operation to a point D of an operation end, is the experimentally predetermined time, for instance, being set to 20min. This time t2 is set as the integrated time with a heater 9 in a condition Hi. Accordingly, in case of temperature after a point C passing through a rotary drum 1, that is, the temperature, detected by a thermostat 12, reaching the controlled temperature Tmax, the heater 9 decreases its input to Lo, for instance, 600W half the input value of Hi, obtaining a drying speed to about 1/2. Then the heater 9, when it is placed in the condition Lo, is calculated integrating 1/2 the time of Hi. Accordingly, when the heater input obtains a condition that a sum of the time Hi(H1+H2+H3) and 1/2 the time Lo, that is, 1/2(L1+L2) is equal to t2, operation is stopped. The actual delay time (t) obtains (H1+H2+H3)+(L1+L2), and a desired drying rate D2 is always obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a clothes dryer that automatically detects dryness.

2. Description of the Related Art One of the conventional methods of controlling a clothes dryer that automatically detects the drying state and ends the operation will be explained with reference to FIG. After a certain drying rate D1 is detected by the drying rate detection means that detects the drying rate by detecting a change in the electrical resistance of clothing or a change in the temperature difference between the intake and exhaust temperatures, the operation is started for a certain time t. The operation was then completed at the desired drying rate D2.

The calculation method for this fixed-time eclipse is simply counting the passage of time, and in order to protect clothing from high-temperature hot air, the heater input value is lowered so that the exhaust temperature does not exceed the temperature control temperature Tmax. The time calculations were the same both when using normal heater input values.

Problems to be Solved by the Invention In such a conventional configuration, when the ambient temperature is high or the return temperature of the thermostat that controls the exhaust temperature is low due to variations in the return temperature of the thermostat, the problem shown in Fig. 4 occurs. As shown, even after lowering the heater input value, the exhaust temperature does not fall to the return temperature TR, and a certain period of operation time elapses after the drying rate is detected while the heater input value remains low, and as a result, the desired drying rate is reached. There was a problem that the operation ended and the drying process ended.

The present invention solves these problems, and even when the heater is operated with a low input value due to high ambient temperature or variations in the 2j1m temperature TR of the thermostat, the desired drying rate can be achieved. The purpose is to prevent drying.

Means for Solving the Problems In order to achieve the above objects, the present invention provides an exhaust temperature detection means having a temperature sensor, a drying drum for introducing hot air heated by a heater, and a drying drum for introducing clothes in the drum. a drying detection means for detecting the drying rate of the drying rate; an operation determining means for calculating and setting a delay time from when the drying rate from the drying detecting means reaches a predetermined value until drying is completed; control means for later stopping the load on the heater or the like; The configuration is such that when the time obtained by calculating and integrating the time proportional to the input value becomes equal, an operation end signal is output.

Effect With this configuration, the calculation method for the eclipse during constant operation after the detection of the drying rate is based on the cumulative time proportional to the subsequent heater input value. The heater input time is directly counted and accumulated as the operating time, and when the exhaust temperature reaches the temperature control temperature and the heater input is lowered, the operating time is counted and accumulated at the lowered rate. the result,
When the heater input during the temperature control operation is decreasing, in other words, when the drying speed is decreasing, the cumulative time is also decreased at the rate of the heater input value. Therefore, it is possible to reflect the influence on the drying speed due to changes in ambient temperature or changes in the thermostat's set temperature in the calculation of the operating time after detection, making it ideal regardless of variations in the operating temperature of the atmosphere or thermostat. This allows for drying operation.

Examples Below, examples of the present invention will be explained with reference to FIGS. 1, 2, and 3.
This will be explained with reference to the figures. In FIG. 1, reference numeral 1 denotes a rotating drum forming a drying chamber, which is rotatably supported within an outer box 2, and its rotation causes the clothes 3 inside to rotate and fall. 4
is a motor provided in the upper part of the outer box 2, which rotates the rotary drum 1 via the belt 5 and simultaneously rotates the heat exchange mold 7778 inside the fan case 7 via the belt 6.

When the heat exchange type fan 8 is rotated, the circulating air gKA in the drum is changed into hot air by the heater 9, and then enters the rotating drum 1 to heat the clothes 3 and turn into moist air. After exchanging heat with the cooling air B through the tube 71 and dehumidifying the air, the air enters the heater 9. Clothes are dried by the series of operations described above. 1-0 is a pre-heat exchange temperature sensor that detects the temperature of the circulating air immediately after passing through the drum 1 and before heat exchange, and 11 is a post-heat exchange temperature sensor that detects the temperature of the circulating air after heat exchange. Similarly to the pre-heat exchange temperature sensor 1o, 12 is a thermostat that detects the temperature of hot air from the rotating drum 1 and controls the input value of the heater.

In the dryer having the above configuration, control until the end of operation will be explained. When the clothes are put in and the heater 9 starts operating, the heater 9 starts operating in the Hl state, for example, in the 1200W state. As the drying progresses, the temperature difference detected by the temperature sensors 10.11 at the outlet and inlet of the heat exchange fan described above is small at first, but gradually increases. Since the rate of increase is proportional to the drying rate, as shown in FIG. 2, the point C when the rate of increase reaches a specified value can be set as a substantially constant drying rate. The time point C is the time point after the start of operation. After t has elapsed, the time t2 from which the operation ends is determined empirically in advance, and is set to, for example, 20 minutes. This t2 is set as the cumulative time when the heater 9 is in the Hl state. Therefore, the temperature after passing the rotating drum 1 after the 0 point, in other words, the temperature detected by the thermostat 12 is the temperature control temperature TmaxK
In such a case, the input to the heater 9 is Lo, for example ao.
The input value decreases to half of oW and Hi, and the drying rate increases by about 3. Therefore, when the heater e is in the Lo state, the time is integrated and calculated using 4, which is Hi. Therefore, in FIG. 2, the operation is stopped when the sum of 4 (L1 + L2), that is, 4 (L1 + L2) of the time when the heater input is Hi (H4 + H2 + H3) and Lo time, is equal to t2.
As shown in FIG. 3, the actual delay time t is (H1+H2+H3)+(L1+L2), and the desired drying rate D2 can always be obtained.

As a result, the heater input value may be low due to reasons such as when the ambient temperature is high or when the thermostat return temperature TR is low.
In the case of condition o, that is, when the drying rate is low, the actual operating time is longer even though 12 hours are the same, and there is no inconvenience such as undrying.

Effects of the Invention As described above, according to the present invention, by calculating the time from when a certain drying rate is detected to the end of operation using the cumulative time proportional to the input value of the heater, the atmospheric temperature or the temperature of the thermostat can be adjusted. It is possible to stop the drying operation at a desired drying rate without being influenced by variations in operating temperature, etc.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a clothes dryer according to an embodiment of the present invention, and FIG. 2 is a drying rate for the same operating time. A diagram showing changes in temperature and heater input value after passing through the drum; Figure 3 is a diagram showing changes in exhaust temperature and drying rate; Figure 4 is a diagram showing changes in exhaust temperature and drying rate of a conventional clothes dryer. It is. 1... Rotating drum, 9... Heater, 1
0, 11...Temperature sensor, 12...
thermostat. Name of agent: Patent attorney Toshio Nakao and 1 other person1°
-Kyototsuyu4 Figure 2 1 Atsushi B8M

Claims (1)

[Claims] an exhaust temperature detection means having a temperature sensor; a drying drum for introducing hot air heated by a heater; a dryness detection means for detecting the drying rate of clothes in the drum; and a dryness rate from the dryness detection means. comprises an operation determining means for calculating and setting a delay time from when the temperature reaches a predetermined value to the completion of drying, and a control means for stopping a load such as a heater after the delay time of the operation determining means has elapsed; When the predetermined delay time from when the drying detection means detects a predetermined drying rate until the end of the operation is equal to the calculated cumulative time proportional to the heater input value after detecting the predetermined drying rate, the operation starts. A clothes dryer that outputs an exit signal.