JPH049197A - Dryer - Google Patents

Abstract

PURPOSE:To reduce drying hours and effectively utilize the heat from the exhaust air and also reduce the noises, by providing a conduction passage flow in the fresh air heated by a heatexchanger to the circulating air passage from the cooling and dehumidifying part to the heating part. CONSTITUTION:Circulating air passages X1-X4 are provided to circulate the air from a drying chamber 10 thereto again after the air from the drying chamber 10 is conducted from a cooling and dehumidifying part 5 to a heating part 11 by a heatexchanger for the air from the drying chamber 10 and the outside air Y1. And also, a conductive passage 15 is provided to conduct the heated outside air Y1 into the above circulating air passage from the cooling and dehumidifying part 5 to the heating part 11 by heatexchanging. As a result, the circulating air volume in the circulating air passage can be increased and the drying hours can be reduced, and further, the exhaust air can be effectively utilized and the noises can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement of a dryer, and more specifically, to increase the circulating air volume of a circulating air path to shorten drying time and to effectively utilize waste heat. The present invention relates to a dryer that can prevent noise from increasing.

[Prior art]

FIG. 5 is a schematic longitudinal cross-sectional view showing a conventional dryer. In this dryer 1, a fan 5 is rotationally driven via a belt 4 by a pulley 3 attached to one shaft of a motor 2. At the same time, the drum 8 is rotationally driven via the belt 7 by the boolean I76 attached to the other shaft of the motor 2.

The fan 5 is a so-called double-blade fan having blowing blades on both sides, and sucks the air in the drying chamber 10 composed of the drum 8 as shown by arrow XI with one blowing blade, and sucks the air into the drying chamber 10 made up of the drum 8 as shown by arrow XI, and with the other blowing blade. Outside air is sucked in and exhausted as shown by arrows Yl and Y2, and the air sucked in from the drying chamber 10 is cooled and dehumidified by this outside air through heat exchange during this time (cooling and dehumidifying section).

It should be noted that the drain generated by the above-mentioned dehumidification is discharged to the outside from the drain hole 9 as shown by arrow Z.

The air sucked in by the fan 5 and cooled and dehumidified is
Further, as shown by arrows X, X3, the air is passed through a heating section 11 consisting of a heater, etc., and heated by this heating section 11 to become dry high temperature air, which is then reintroduced into the drying chamber 10 as shown by arrow X4. .

Clothes and the like (not shown) stored in the drying chamber 10 are dried by this dry high-temperature air.

In addition, in this drying fla1, a circulating air path (X+
, X2, X3, X4), for example, a filter cover 12 and a filter 14 are attached to the rear surface of the drum 8,
The dry air is purified.

Generally, in order to shorten the drying time of the dryer 1, it is most effective to increase the volume of the circulating air or the thermal output of the heating section 11 to improve the drying capacity.

By the way, in this type of dryer, a PTC heater (PositiveTe) is used as a heater constituting the heating section 11.
mperatureCharacteristic
Heater) is commonly used.

This PTC heater has a property that the lower the surface temperature is, the lower its resistance is, the input current increases, and the heat output increases. Therefore, in a dryer using such a PTC heater, by increasing the volume of the circulating air, not only can the drying capacity be improved by increasing the volume of air, but the surface temperature of the PTC heater can also be increased by increasing the volume of air. heating section 1 using this PTC heater.
The heat output of 1 can also be increased, further increasing the drying capacity.

Therefore, in such conventional dryers, various measures are taken to increase the amount of air blown, but the usual methods for increasing the amount of air are increasing the diameter or blade size of the fan 5, or increasing the size of the fan 5. For example, increasing the number of rotations of the motor.

[Problem to be solved by the invention]

However, the conventional method of increasing the diameter etc. of the fan 5 described above requires the overall height and depth of the product to be significantly increased, and is adopted because of the structure of the product whose development mission is to make it smaller and lighter. You shouldn't.

Furthermore, the method of increasing the rotational speed of the fan 5 causes adverse effects such as an increase in noise and progressing wear of the fan bearing.

By the way, as mentioned above, the fan 5 sucks in outside air and exhausts it (arrows Yl, Y2), and uses this outside air to cool and dehumidify the circulating air sucked in from the drying chamber 10, but the exhaust air shown by the above arrow Y2 is normally , the temperature becomes high due to heat exchange with the above-mentioned suction circulating air.

As a result, this exhaust air not only causes an increase in indoor temperature, which has an adverse effect, but also causes waste in terms of thermal efficiency of the dryer 1, which is not preferable.

Therefore, the present invention makes it possible to increase the volume of the circulating air without increasing the diameter of the fan 5, thereby improving the drying ability and shortening the drying time. This was done with the purpose of providing a dryer that can be used effectively and that can prevent an increase in noise.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a circulating air path that cools and dehumidifies air from the drying chamber by exchanging heat with outside air, circulates the air from the cooling and dehumidifying section to the heating section, and then circulates it back to the drying chamber. The dryer is configured as a dryer characterized in that an introduction passage is provided for introducing outside air heated by the heat exchange into the circulating air path between the cooling and dehumidifying section and the heating section.

(Function) In this dryer, heated outside air after heat exchange is introduced into the circulating air path between the cooling and dehumidifying section and the heating section through the introduction passage.

As a result, in this dryer, the volume of circulating air is greatly increased, and since the temperature is already raised before entering the heating section, the drying capacity can be significantly increased and the drying time can be shortened. .

Further, the heated outside air after the heat exchange is introduced into the circulating air path as described above and is not exhausted wastefully, so that its exhaust heat is effectively utilized.

Further, as described above, by introducing the outside air after the heat exchange into the circulating air path through the introduction passage, the exhaust noise can also be reduced.

〔Example〕

Hereinafter, embodiments embodying the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

In addition, the following example is an example embodying the present invention,
It is not intended to limit the technical scope of the present invention.

Here, FIG. 1 is a vertical cross-sectional schematic diagram showing a dryer according to an embodiment of the present invention, FIG. 2 is a flowchart showing an example of the drying process of the dryer, and FIG. 3 is a diagram showing three directions of the dryer. FIG. 4 is a schematic explanatory diagram showing the valve, and a time chart showing temperature changes in various parts due to drying processing of the dryer.

Further, the same reference numerals are used for elements common to the conventional dryer shown in FIG. 5, and the suffix 8 is added to distinguish elements that are common to the dryer but have different functions.

The characteristic feature of the dryer 1a according to this embodiment is that, as shown in FIG. The circulating air path between the heating section 11 and
For example, arrow X2. (between X3).

Therefore, this dryer 1. Now, due to the rotation of the fan 5, the air from the drying chamber 10 is drawn as indicated by the arrow XI.

X,,X3. The outside air (Y+) is circulated as shown in X, and sucked in by the fan 5, and after exchanging heat with the circulating air and increasing its temperature, it passes through the bypass duct 15 as shown by arrow Y2, and is then sucked in by the fan 5. X of circulating air,,X
, as shown by arrow Y3.

Note that at this time, a part of the circulating air is exhausted through the drain hole 9.

As a result, in this dryer 1a, the volume of the circulating air can be significantly increased.

Therefore, due to the increase in the volume of the circulating air, the thermal output of the heating section 11 composed of a PTC heater etc. is also increased, and the synergistic effect of the increase in the air volume and the increase in heat output greatly increases the drying capacity of the dryer 1a. .

Furthermore, since the air sent through the bypass duct 15 has already been heated, the temperature of the heated air will rise significantly, and a significant increase in drying capacity can be expected.

In this dryer 1a, a three-way valve 16 is attached to the bypass duct 15, and this three-way valve 16 is turned on or off to switch between a-b or a-4c as shown in FIG. and its conduction state can be switched.

In addition, a temperature sensor T consisting of a thermistor or the like is installed in the circulating air path and the bypass duct path of this dryer 1a.
, , T2 and T3. T4 is installed, and the temperature of the circulating suction air from the drying chamber 10 tI+ The temperature of the circulating air after heat exchange with the outside air by the fan 5 t2. Outside air temperature t3. The exhaust outside air temperature t4 after heat exchange with the circulating air is detected.

In this dryer 1□, the three-way valve 16 is switched as described later based on the detection signals of these temperature sensors.

Next, referring to FIG. 2, steps SL, S2. ... will be explained in order.

When the predetermined starting operation of this dryer 1a is performed (31)
, the motor 2 is driven, the fan 5 and the drum 8 start rotating (S2), and the heating unit 11 is turned on (S2).
3. Figure 4 (a)).

(2) At this time, the solenoid 17 is turned off, and the outside air (Y,) sucked in by the fan 5 is exhausted from the three-way valve 16 as shown by arrow Y4 after heat exchange.

Moreover, the air sucked by the fan 5 from the drying chamber 10 is circulated through the circulation path (X+, X2, X3, X4).

That is, this dryer 1. At the time of startup, the temperature of the circulating air is still low and the same temperature as the outside air, so the heat output of the PTC heater in the heating section 11 is sufficiently large, and the temperature of the outside air (Y,) after the heat exchange is Since the air pressure is not high and the amount of waste heat is small, it can be operated using the same air path as before.

At this time, as described above, the outside air is exhausted through the bypass duct 15 and the three-way valve 16 as shown in Y, Y, so that the exhaust noise of the fan 5 can be reduced.

Then, the temperature inside the drying chamber 10 rises, and the temperature of the circulating suction air from the drying chamber 10 increases. and outside temperature t.

If the difference exceeds the predetermined temperature ΔT1 (S4. Fig. 4 (b)
), the solenoid 17 is turned on and the three-way valve 16 is switched (S5).

That is, as described above, the outside air Y drawn in by the fan 5 becomes high temperature after heat exchange, and flows through the circulating air path X2. as shown by the arrow Y3. The above-mentioned drying capacity increasing operation is performed in which the amount of circulating air is increased by introducing the air between X3 and X3.

Therefore, it is possible to shorten the drying time of items to be dried (not shown) such as clothes stored in the drying chamber 10, and also to utilize the exhaust heat of the outside air which has become high temperature after heat exchange as described above. Furthermore, since the exhaust air at this time is discharged to the outside from the drain hole 9 as described above, exhaust noise can also be reduced.

After that, the temperature inside the drying chamber 10 further increases, and the drying chamber 10
When the temperature of the circulating suction air exceeds the predetermined temperature TX (S6, FIG. 4 (c)), the heating section 11 is de-energized (S7), and the rotation of the motor 8 is also stopped ( S
8).

Then, the solenoid 7 is turned off and the three-way valve 16 returns to its original switching state (S9).

In the above embodiment, the heating section 11 is composed of a PTC heater, but the heating section 11 may be replaced by another heater.

For example, a sheathed heater or the like may be used.

〔Effect of the invention〕

According to the present invention, a dryer is provided with a circulating air path that cools and dehumidifies air from the drying chamber by heat exchange with outside air, passes the air from the cooling and dehumidifying section to the heating section, and then circulates it back to the drying chamber. A dryer is provided, characterized in that an introduction passage is provided for introducing heated outside air into the circulating air path between the cooling and dehumidifying section and the heating section.

Therefore, the amount of circulating air in the circulating air path can be increased to shorten the drying time, and exhaust heat can be effectively utilized and noise can be reduced.

[Brief explanation of drawings]

Fig. 1 is a schematic vertical cross-sectional view showing a dryer according to an embodiment of the present invention, Fig. 2 is a flowchart showing an example of drying processing of the dryer, and Fig. 3 shows a three-way valve of the dryer. FIG. 4 is a time chart showing temperature changes in various parts due to the drying process of the dryer, and FIG. 5 is a schematic vertical cross-sectional view showing a conventional dryer. [Explanation of symbols]

Claims (1)

[Scope of Claims] 1. In a dryer equipped with a circulating air path that cools and dehumidifies air from the drying chamber through heat exchange with outside air, circulates the air from the cooling and dehumidifying section to the heating section, and then circulates it back to the drying chamber. A dryer characterized in that an introduction passage is provided for introducing outside air whose temperature has been raised by the heat exchange into the circulating air path between the cooling and dehumidifying section and the heating section.