JPH0292399A - Clothing drier - Google Patents

Abstract

PURPOSE:To enable drying to be performed properly and evenly in every time the drying running is continued a plurality of times by turning off a heater and turning on only a blast mamas by both temperature sensors provided an inlet and outlet of a heat exchanging means if the starting temperature condition is judged insufficient. CONSTITUTION:In a prior clothing drier, the running thereof is started while a difference between T1, T2 is present, so that sufficient drying is not achieved. Thus, when at least a predetermined difference between temperatures T1, T2 is present in the start of running or temperature T1 or T2 is at least a predetermined one, a heater 11 is suspended until temperatures of an inlet and outlet 21, 22 of a heat exchanger are made equal to each other, and after blast running of running only a motor 12 both heater power control switch 7 and motor power control switch 8 are turned on to perform the normal drying running. Thus, even if another clothing is to be continuously dried a plurality of times, the condition for the starting point of running can be made equal to that for the first time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a clothes dryer that dries clothes stored in a rotating drum by exposing them to hot air.

2. Description of the Related Art In a conventional clothes dryer of this type, a heat exchanger for removing humidity is provided in a part of a hot air circulation path including a rotating drum and a heater, and each of the inlet and outlet portions of the heat exchanger is provided with a heat exchanger for removing humidity. was equipped with a temperature sensor. Then, the temperature detected by these temperature sensors and the amount of change in the temperature difference over a certain period of time were calculated. This temperature difference has a correlation with the degree of dryness. For example, as shown in Figure 2, as drying progresses, a difference in temperature between the inlet part T1 and the exhaust part T2 is used to dry the air. He was assessing the condition. In addition, the amount of clothes to be dried is determined based on the detected temperature after a predetermined period of time has elapsed from the start of operation, and when the amount of clothes to be dried is small, intermittent operation of the morph that drives the rotating drum is performed.

Problem to be Solved by the Invention However, with the conventional dryness detection means as described above, when the drying object is divided into two or more operations, regardless of the second operation, new There has been a problem in that when drying an object to be dried, drying becomes insufficient.

That is, when drying a new material to be dried from the second time onwards, as shown in Figure 4, the temperature inside the rotating drum may be high or the temperature near the heat exchanger inlet of the hot air circulation path may be too high. The conditions at the start of operation may be different from the first time, such as a large temperature difference near the outlet, and even immediately after starting operation, drying may have already progressed halfway, or the amount of material to be dried may be less than standard. The motor and heater could not be controlled correctly because it was determined as if it were.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a clothes dryer that can perform drying correctly and evenly each time even if the drying operation is repeated multiple times.

Means for Solving All the Problems In order to achieve the above objects, the present invention provides temperature sensors provided near the inlet and near the outlet of the heat exchange means in the hot air circulation path, and temperature and Calculate the amount of change in the temperature difference over a certain period of time,
If it is determined that the detected temperature or temperature difference exceeds a predetermined value during a predetermined period of time immediately after the start of operation, the heater is turned off until the temperature difference disappears or becomes below a very small value, and only the air blowing means is turned on. The configuration includes a control means for performing air blowing operation.

Function: In the clothes dryer of the present invention, when restarting operation after putting clothes to be dried in the middle of drying, the rain detection temperature and the temperature difference at a predetermined time after restarting the operation are set to a predetermined value. If the temperature exceeds this value, it is determined that the starting temperature conditions are insufficient, and the heater is turned off until the temperature difference disappears or becomes less than a very small value, and then the heater and motor are turned off again after performing ventilation operation. Turn on and perform normal drying operation.

As described above, even when drying new objects to be dried multiple times in succession, an appropriate drying state can always be obtained by making the conditions at the start of operation the same as those for the first time.

EXAMPLES Hereinafter, examples of the present invention will be explained based on FIGS. 1 to 3.

In FIG. 1, 23 is a hot air circulation path, a part of which has an inlet 21 and an outlet 22 of a heat exchanger having a dehumidifying function, and the temperature near the inlet 21 and outlet 22, respectively. Sensors 1 and 2 are provided. Reference numeral 20 denotes a control device for the clothes dryer, which includes a main control section 5, a temperature-voltage conversion section 3 that converts the temperature detected by both the sensors 1 and 2 into voltage, and a heater for generating hot air arranged in the circulation path. 11. Power control unit 7 for automatically controlling the motor 12 that drives the blower and the rotating drum;
8. The display unit 9 for displaying the operation status further includes a door opening/closing detection unit 6 for detecting the states of the start/stop switch 4 and the door switch 13. 10 is a control power supply section.

The operation of the above configuration will be explained below.

The temperature changes at the heat exchanger inlet 21 and the heat exchanger outlet 22 during a series of operations of the clothes dryer form curves such as T1 and T2 shown in FIG. 2, respectively.

In other words, the temperatures T1 and T2 at the start of operation are equal;
The difference gradually increases, and after maintaining a constant difference, the difference widens again to achieve proper drying.

Thereafter, the difference gradually decreases, and the temperatures T and T2 become equal as they were at the start of operation.

This state is detected by the temperature sensors 1 and 2, these detected temperatures are converted into voltage by the temperature-voltage converter 3, and the main controller 5 performs arithmetic processing, determination, storage, and control.

Next, in a conventional clothes dryer, the temperature changes at the heat exchanger inlet section 21 and the heat exchanger outlet section 22 when the operation is continued again after a series of operations are completed are shown in FIG. 4, respectively. As shown, the curve becomes T1゜T2,
The energization control of the heater and motor starts operation while there is a difference between T1 and T2, and a sufficient drying result cannot be obtained.

Accordingly, temporal changes in the temperatures T and T2 of the heat exchanger inlet section 21 and the heat exchanger outlet section 22 and energization control of the heater and motor in the present invention will be explained using FIG. 3.

At the start of operation, if there is a difference between T1 and T2 of more than a predetermined value, or if the temperature of T or T2 is more than a predetermined value, the temperatures of the heat exchanger inlet part 21 and the heat exchanger outlet part 22 are made equal. until the heater section power control switch 7
After turning off the heater 1, stopping the heater 1, and performing an air blowing operation in which only the motor 2 is operated, the heater section power control switch 71 and the motor section power control switch 8 are both turned on to perform a normal drying operation.

By doing this, even when drying new objects to be dried multiple times in succession, the detected temperature of the temperature sensor 1.2 can be made the same, that is, the conditions at the start of operation can be made the same as the first time. This makes it possible to always obtain an appropriate dry state.

Effects of the Invention As described above, according to the present invention, at the start of operation,
If the temperature at the inlet and outlet of the heat exchanger exceeds a specified value, or if there is a difference between them by more than a specified value, turn off the heater until the temperature difference disappears or becomes below a very small value. By performing the normal drying operation after performing the air blowing operation, it is possible to always obtain an appropriate drying state, and moreover, it is possible to eliminate concerns about the clothes dryer.

[Brief explanation of the drawing]

FIG. 1 is a pronk diagram of a clothes dryer according to an embodiment of the present invention, and FIG. 2 shows temporal changes in temperatures T1 and T2 at the heat exchanger inlet and heat exchanger outlet during operation of the clothes dryer. The graph in FIG. 3 shows temporal changes in temperatures T1 and T2 at the inlet and outlet of the heat exchanger and the heater when the operation is continued again after a series of operations have been completed.
FIG. 4 is a diagram showing the energization control of the motor, and shows the temperatures T1 and T2 at the heat exchanger inlet and heat exchanger outlet when the conventional clothes dryer is operated again after a series of operations have been completed. FIG. 3 is a diagram illustrating temporal changes in , and energization control of a heater and a motor. 1.2...Temperature sensor, 5...Main control section, 7...Heater section power control switch, 8.
...Motor power control switch, 13...
・Door opening/closing detection switch, 14...Power switch, 20...Control device, 21...Heat exchanger inlet, 22...Heat exchanger outlet Department, 23・
...Hot air circulation path. Name of agent: Patent attorney Shigetaka Awano and one other person
Kutsutsu T,, 77~J Hikinu 4-7 Chi 20-! #, flll

Claims (1)

[Claims] A hot air circulation path including a rotating drum and a heater for stirring the clothes, and a blowing means for blowing air in the hot air circulation path;
A heat exchange means for removing humidity from the hot and humid air flowing out from the rotating drum, temperature sensors placed near the inlet and outlet of the heat exchange means, and the temperatures detected by these two temperature sensors and their temperatures. The amount of change in the difference over a certain period of time is calculated, and if it is determined that the detected temperature or temperature difference exceeds a predetermined value at a predetermined time immediately after the start of operation, the temperature difference disappears or becomes below a very small value. A clothes dryer equipped with a control means that performs an air blowing operation by turning off a heater and turning on only the air blowing means until the temperature is reached.