JPS6211599Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a dryer that is widely used at home to dry clothes, etc.

(b) Prior Art In most conventional dryers, the drying time was determined by the user based on the amount of clothes and surrounding conditions using a timer. Therefore, once the dryer has run for the set time, it will stop regardless of how dry the clothes are, and if the drying time is too long, the dryer will overdry, damaging the clothes, and damaging the heat source. It is uneconomical because it operates more than necessary, and when the drying time is short, it is in an undried state and needs to be dried again.

For this reason, in recent years, the temperature of the exhaust air from the drying room increases rapidly when the clothes approach the appropriate degree of dryness, regardless of the type, amount, or degree of dehydration. There are devices that detect this and stop the heat source or stop operation when it reaches a predetermined temperature. However, there was a significant difference in the temperature of the exhaust air between summer and winter, causing problems such as setting the thermostat to the summer temperature would result in over-drying in the winter, and setting it to the winter temperature would result in under-drying in the summer. .

Therefore, a system is being considered that measures the outside air temperature and exhaust temperature using a sensor such as a temperature-sensitive resistance element, and stops the drying operation when the temperature difference between the two reaches a predetermined value, but this control device It is quite expensive, and since the dryer is used in a high-humidity atmosphere such as a bathroom or other water source in general households, circuit elements such as resistors, capacitors, transistors, printed circuit boards, and solder used in this control device are required. There was a drawback that the reliability of joints etc. was reduced.

(c) Purpose of the invention The object of the invention is to obtain a control device that is simple and inexpensive and can detect a certain degree of dryness and terminate the operation without being affected by the outside temperature.

(d) Structure of the invention The present invention consists of a plurality of exhaust temperature detection thermostats that detect exhaust temperature from drying chambers with different operating temperatures, and a plurality of outside air temperature detection thermostats that detect outside air temperatures with different operating temperatures. and a dryness detection means that selects an exhaust temperature detection thermostat whose operating temperature is high as the outside air temperature increases, and is activated by the selected exhaust temperature detection thermostat. This makes it possible to detect a certain degree of dryness and end the operation, regardless of the outside temperature.

(E) Embodiment 1 is a timer that opens the first timer switch 2 when a set time elapses;
The second timer switch 3 is driven by a timer motor 4 and is opened a certain period of time before the second timer switch 3 is opened. A timer motor 4 and a drive motor 5 are connected to the first timer switch 2. The drive motor 5 rotates a drum serving as a drying chamber, and also rotates a blower to pass heated air heated by a heater 6 into the drum and then discharge it. A heater 6 is connected to the second timer switch 3 via a normally closed contact 8 of an automatic manual changeover switch 7 and a normally closed thermostat 9 for temperature adjustment.
The first timer switch 2 is further connected to a relay coil 1 via a normally open contact 10 of the changeover switch 7.
1 is connected to the dryness detection means. 12, 13, and 14 are normally closed thermostats that detect the exhaust temperature from the drying chamber, and their operating temperatures are different.
13 and 14 have exhaust temperatures of T ₁ [℃] and T ₂ respectively.
[°C], is opened when T ₃ [°C] is reached. however
T ₁ <T ₂ <T ₃ . 15 and 16 are normally open thermostats that detect the outside temperature, and the thermostats 15 and 16 are closed when the outside air temperature reaches t ₁ [°C] and t ₂ [°C], respectively. However, t ₁ < t ₂
It is. An exhaust temperature detection thermostat 12 is inserted between the relay coil 11 and the normally open contact 10 of the changeover switch 7, and in parallel with this thermostat 12, an outside temperature detection thermostat 15, an exhaust temperature detection thermostat 13, and 1
6 and 14 series circuits are connected. The normally closed contact 17 of the relay coil 11 is connected to the timer motor 4
The normally open contact 18 is inserted between the normally open contact 10 of the changeover switch 7 and the heater 6. 19 is a power source.

Next, the operation will be explained. First, when all operations are controlled by the timer 1, the automatic/manual changeover switch 7 is set to manual, the normally open contact 10 is opened, the normally closed contact 8 is kept closed, and the timer 1 is set to a time limit. Then, the timer motor 4 and drive motor 5 are driven via the first timer switch 2, and the heater 6 is energized via the second timer switch 3, the normally closed contact 8, and the temperature adjustment thermostat 9, and heats up. Air is supplied into the drum, dries the clothes inside, and then is discharged to the outside of the drum. Then, at a certain time before the set time of the timer 1, the second timer switch 3 is opened to turn off the heater 6, and then air is supplied to the drum without heating until the first timer switch 2 is opened to maintain the temperature of the clothes. lower. When the timer set time elapses and the first timer switch 2 is opened, all circuits are turned off.

Next, when performing automatic operation that automatically detects the degree of dryness, set the changeover switch 7 to automatic, open the normally closed contact 8, close the normally open contact 10, and set the timer 1. . Then, the relay coil 1 is activated via the normally open contact 10 of the changeover switch and the exhaust temperature detection thermostat 12.
1 is energized, its normally open contact 18 is closed to energize the heater 6, and its normally closed contact 17 is opened to cut off the energization to the timer motor 4, thereby stopping the timer 1 from advancing.

Now, assuming that the outside air temperature is below the above t ₁ [°C], both the outside air temperature detection thermostats 1
5 and 16 are open, the thermostat 12 is opened when the drying progresses and the exhaust temperature rises to T ₁ [°C], cutting off the excitation to the relay coil 11 and opening its normally open contacts. 18 is opened to cut off the power to the heater 6, and at the same time, the normally closed contact 17 is closed to drive the timer motor 4 to start the timer, and supply unheated air to the drum for the time set by the timer. Lower the temperature of the clothes inside. When the timer set time elapses and the first timer switch 2 is opened, all circuits are turned off.

Furthermore, since the thermostat 15 is closed when the outside air temperature is between t ₁ [°C] and t ₂ [°C], even if the exhaust temperature reaches t ₁ [°C] and the thermostat 12 is opened, the thermostat 15 remains closed. and 13, the relay coil 11 is continuously energized, and when the exhaust temperature reaches T ₂ [° C.] higher than T ₁ [° C.] and the thermostat 13 is opened, the excitation to the relay coil 11 is cut off. The rest is as described above.

Furthermore, when the outside air temperature is above t ₂ [°C], the thermostat 16 is closed, so when the exhaust temperature reaches T ₃ [°C], which is higher than the above T ₂ [°C], the thermostat 14 is opened. Relay coil 11
The excitation to is cut off.

In this way, one exhaust temperature detection thermostat is selected so that its operating temperature increases as the outside air temperature increases, and the selected thermostat controls the energization of the relay coil 11. Therefore, when the outside air temperature is high, the end of drying can be detected with a high exhaust temperature, and when it is low, the end of drying can be detected with a low exhaust temperature, and the operation can be ended by detecting a nearly constant degree of dryness without being affected by the outside air temperature.

The above outside temperature detection thermostat 15, 16
and exhaust temperature detection thermostat 12, 13, 1
4 can be connected as shown in FIG. 2 to obtain the same operation. The figure shows only the main parts of the circuit.

In the above embodiments, the outside air temperature sensing thermostat is of the normally open type and the exhaust temperature sensing thermostat is of the normally closed type, but the reverse is also possible. FIG. 3 shows the circuit in this case. Here, the outside temperature detection thermostats 20 and 21 each have an outside temperature of _t1.
It opens when it becomes higher than [℃] and t ₂ [℃]. However, t ₁ <t ₂ . Furthermore, the exhaust temperature detection thermostats 22, 23, and 24 each detect the exhaust temperature.
It closes when it becomes higher than T ₁ [℃], T ₂ [℃], T ₃ [℃]. However, T ₁ < T ₂ < T ₃ . Also, the relationship between the front closed contact 17 and the normally open contact 18 of the relay coil 11 is opposite to that shown in FIG. A normally closed contact 17 is inserted between them.

Therefore, if the outside air temperature is below t ₁ [℃], the exhaust temperature reaches T ₁ [℃] and the thermostat 2 is turned off.
2 is closed, the relay coil 11 is energized, the power to the heater 6 is cut off, and the outside temperature is lowered.
If t ₁ [°C] to t ₂ [°C], the exhaust temperature is T ₂
When the temperature reaches [°C] and the thermostat 23 closes, the relay coil 11 is energized, and if the outside air temperature is _t2 [°C] or more, the exhaust temperature becomes _T3.
When the temperature reaches [° C.] and the thermostat 24 closes, the relay coil 11 is energized.

FIG. 4 shows the main part of a circuit different from that in FIG. 3 when the same thermostat as in FIG. 3 is used, but the operation is exactly the same.

The control device of the present invention can be applied to various types of dryers, such as those in which exhaust air from the drying chamber is cooled with a cooler to remove moisture, and then reheated and supplied to the drying chamber. In this case, an outside air temperature sensing thermostat may be installed at the outside air intake port for cooling the cooler by exposing it to outside air.

(f) Effects of the invention According to the invention, the dryness detection means is activated at a high exhaust temperature when the outside air temperature is high and at a low exhaust air temperature when it is low, so that dryness can be maintained at an almost constant level without being affected by the outside air temperature. It is possible to control the operation by detecting the temperature. The circuit configuration is also inexpensive, since the dryness detection means is activated simply by combining a plurality of outside temperature detection thermostats and exhaust temperature detection thermostats, and no expensive electronic circuits are required.

[Brief explanation of the drawing]

The drawings show a dryer according to the present invention; FIG. 1 is an electric circuit diagram, and FIGS. 2 to 4 are electric circuit diagrams of different embodiments. 12, 13, 14, 22, 2
3, 24...Exhaust temperature detection thermostat, 1
5, 16, 20, 21...Outside temperature detection thermostat, 11...Relay (dryness detection means).

Claims (1)

[Scope of utility model registration request] A plurality of exhaust temperature detection thermostats that detect the temperature of exhaust gas from drying chambers with different operating temperatures, a plurality of outside air temperature detection thermostats that detect outside air temperatures with different operating temperatures, and selection based on the outside air temperature detection thermostats. and a dryness detection means operated by one exhaust temperature detection thermostat, the exhaust temperature detection thermostat having a higher operating temperature selected as the outside air temperature becomes higher by the outside air temperature sensing thermostat. A dryer control device that allows