JPS61170495A - Clothing dryer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a clothes dryer for drying clothes.

BACKGROUND OF THE INVENTION Conventional clothes dryers of this type utilize the correlation between the temperature change at one point in a general hot air circulation path and the degree of dryness.

That is, as shown in FIG. 5, the temperature continues to rise at the beginning of the operation, and after a certain period of time has passed, a constant rate drying period is entered in which the drying operation continues with the temperature rising stopped.

Then, as the drying progresses further, the temperature rises again,
It takes advantage of the fact that a set degree of dryness is reached by a constant temperature rise.

Therefore, conventional clothes dryers detect the constant rate drying period using a humidity sensor installed in the hot air circulation path, calculate the detected temperature change, and determine the appropriate time to dry the clothes. It was something to detect.

Problems to be Solved by the Invention In such conventional clothes dryers, one
Since only one temperature control unit is provided, there are problems in distinguishing between the initial temperature rise period and the temperature rise after the constant rate drying period, detection within the constant rate drying period, and processing for data variations. The former was handled by not performing the detection process for a certain period of time after the start of operation, and the latter was handled by increasing the number of calculation processing steps.

However, even in the above-mentioned dryer, the accuracy of determining the constant rate drying period is ambiguous, and there is a problem in that the degree of drying varies.

The present invention solves these problems and improves the accuracy of constant rate drying period detection even with variations in temperature changes including the condition of the material to be dried, and improves drying accuracy with simple calculation processing. The purpose is to measure.

Means for Solving the Problem In order to solve this problem, the present invention detects the temperature by temperature sensors installed at the population and outlet of the heat exchanger in the hot air circulation path, and detects the temperature difference for a certain period of time. It performs calculation processing of the amount of change in .

The temperature changes at the inlet and outlet of the heat exchanger are different, so by detecting the temperature difference between them with a temperature sensor and calculating the amount of change over a certain period of time, we can calculate the initial temperature rise and the temperature after the constant rate drying period. The temperature rise can be clearly distinguished, and the constant rate drying period can be accurately detected.

Examples Examples of the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 8 denotes a hot air circulation path, in which there is a heat exchanger outlet 9 and a heat exchanger outlet 10, respectively.
A first temperature sensor 1 and a second temperature sensor 2 are installed.

The temperature changes at the heat exchanger outlet 9 and the heat exchanger outlet 10 during operation of the clothes dryer are T1. as shown in FIG. 2, respectively. It will look like T2. This state is sequentially introduced into the first temperature sensor 1 and the second temperature sensor using the time division switching unit 3 in the arithmetic processing storage unit 11 which is a control unit, and the temperature difference calculation unit 4 Calculate the temperature difference between T1 and T2 shown in Figure 2 and
The results shown in the figure are obtained and stored in the storage unit 5.

The temperature difference at this time and the temperature difference stored in the storage unit 6 a certain time ago are compared and calculated in the temperature difference change calculation unit 6, and the result is predetermined in the constant rate drying period determination unit 7. It is determined whether the constant rate drying period has been reached.

In particular, as shown in FIG. 4, the amount of change in temperature difference initially attenuates, and the constant rate drying period is detected when it is determined that the temperature difference is zero.

As in this embodiment, depending on the ambient temperature, T1 in FIG.
T2 changes up and down, and the absolute value of the temperature difference shown in FIG. 3 also changes, but as shown in FIG. 4, the amount of change in the temperature difference during the constant rate drying period becomes almost zero, and accurate detection is performed.

Effects of the Invention In the present invention, the constant rate drying period can be accurately detected based on the amount of change in the temperature difference between two points at the outlet and inlet of the heat exchanger in a series of hot air circulation paths, which have different temperature changes, and can be efficiently carried out without waste.
Highly accurate drying can be performed.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the control section of a clothes dryer according to an embodiment of the present invention, Fig. 2 is a diagram showing when the clothes dryer is in operation, and Fig. 6 is a diagram showing temperature changes during operation of a conventional clothes dryer. It is a diagram. 1...First temperature sensor, 2...Second
Temperature sensor, 8...Hot air circulation path, 11...
...Arithmetic processing storage unit. Name of agent Patent attorney Toshio Nakao 11 or 1 person w & Shirozuka
Regret

Claims (1)

[Claims] The constant rate drying period can be detected by detecting and storing the temperature difference between temperature sensors installed at the inlet and outlet of the heat exchanger in the hot air circulation path, and calculating the amount of change in the temperature difference over a certain period of time. Clothes dryer equipped with a control section.