JPS61109597A - 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] Industrial Application Field The present invention relates to a hot air dryer using a dehumidifier.
In particular, it relates to a dryer for drying clothes and the like.

Structure of a conventional example and its problems A conventional drying system is shown in the block diagram of FIG. 1, and its operation is shown in the psychrometric diagram of FIG. 2. Temperature tAC
C), the absolute humidity is xA<biu), -[-7Talpi is i
A (lal/%-') drying air A (A in Figure 2) is heated with heater 1 to give a temperature tB and an enthalpy iB.
The hot air B in the state shown in FIG. 2 (B in FIG. 2) is blown into the drying object storage 2 by the fan 3 to dry the drying objects.

At this time, since there is no exchange of heat with the outside, the drying air undergoes an isenthalpic change, and as the temperature drops to tc, the absolute humidity rises to xc (C in Figure 2) and becomes hot air C, which condenses. The heat exchanger is fed into a heat exchanger. In the heat exchanger 4, the drying air is cooled to tA by the cooling air at room temperature outside the machine and dehumidified to an absolute humidity of xA. Thereafter, it is heated again by the heater 1 and used again to dry the material to be dried. On the other hand, the cooling air D~ is heated to a temperature tE and discharged outside the machine.

In such a conventional dryer, in order to increase the drying speed, it is necessary to lower the absolute humidity of the drying air entering the drying object storage 2 or to increase the temperature. Possible ways to lower absolute humidity include cooling and dehumidifying with a refrigerator, etc., or dehumidifying with a moisture absorbent, but both require extra power for one operation of the refrigerator or for regenerating the moisture absorbent. This becomes extremely inefficient. One way to raise the temperature of drying air is to increase the input to the heater, but this was not practical.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and provides a dryer with high drying speed and high efficiency without increasing the heater input.

Structure of the Invention In order to achieve this object, the dryer of the present invention includes a drying air circulation path formed between a drying material storage and a dehumidifier, and a drying air circulating path within the circulation path. a regeneration heater of the dehumidifier; a heat exchanger for recovering heat from the first regeneration air after being used for regeneration to the second regeneration air; It consists of a fan for air. With this configuration, the humid drying air that has removed moisture from the object to be dried is dehumidified using a dehumidifier, and the temperature is raised by isenthalpic change to dry the object again. To regenerate the dehumidifier, the first regeneration air is heated by a regeneration heater and then supplied to the dehumidifier, and is further heated by exchanging heat with the first regeneration air using a heat exchanger. The dehumidifier is regenerated by the second regeneration air. By performing heat recovery as described above, it is possible to realize a dryer with high drying speed and high efficiency without increasing the heater input.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram of a dryer according to an embodiment of the present invention, and FIG. 4 is a psychrometric diagram illustrating its operation.

In the figure, j5i"l is a drying item storage for storing clothes, etc., and 6 is a rotating cylindrical dehumidifier, which is made by impregnating cardboard or the like with a dehumidifier such as lithium chloride, and has a ventilation hole in the axial direction. 7 is a fan for circulating the drying air, and the drying air is circulated between the drying material storage 6 and the dehumidifying area 8 of the dehumidifier 6. 9 is a regeneration heater that heats the first regeneration air, and 10 is a heat exchanger that recovers heat from the first regeneration air.The first regeneration air is It is heated by the regeneration heater 9, then regenerates the dehumidifier in the first regeneration area 11 of the dehumidifier 6, and then enters the heat exchanger 10 and is cooled and then exhausted. The second regeneration air introduced into the first
After being heated by the regeneration air, it enters the second regeneration area 12 of the dehumidifier 6, regenerates the dehumidifier, and is discharged. 13-a
・13-b is the 1st. This is a second fan for blowing air for regeneration.

The operation of the dryer configured as described above will be explained below using an psychrometric chart. The drying air F after drying clothes, etc. at a temperature of 30° C., a relative humidity of 70 degrees, and an absolute humidity of 0.0188 KJl/9' enters the moisture absorption area 8 of the dehumidifier 6.
When air is blown at a rate of 164KIP/h by the fan 7, the drying air G undergoes an isenthalpic change and the temperature rises to 50.5°C, while at the same time the absolute humidity decreases to 0.0106()' (4th Figure F→G). This high-temperature, low-humidity drying air G efficiently dries the items to be dried, such as clothes, evaporates 1.5 sKP/h of moisture, undergoes isentropic change again, returns to point F, and the drying air circulates. (Figure 4 F-+G→F). Dehumidifier 6 5-10 per hour
Because of the rotation, the dehumidifier that has dehumidified in the dehumidifying area 8 moves to the regenerating areas 11 and 12 of the dehumidifier 6, where regeneration is performed. 20'C, the temperature of the first regeneration air H of the 60th section is 138C by the regeneration heater 9 of 120oW.
(I), and the first regeneration region 11 is heated to 3eKy'.
When air is blown at a rate of /b, the moisture in the dehumidifier is reduced to o, 17/
The first regeneration air undergoes isentropic change, with a temperature of 73°C2 and an absolute humidity of 0.0.
It becomes the first regeneration air ■ of 339 H/I&'. Air is then blown to the heat exchanger 1°, where air is drawn in from outside the machine.
56°C (L) by the second regeneration air K of °C960
point). On the other hand, moisture in the second regeneration dehumidifier, which sucks air from the outside, is evaporated at a rate of 0.451 (,/h) and regenerated.

As mentioned above, in the dryer of this embodiment, 1200W = 1
1,35 Kl/for input of 0321 cal/h
The evaporation rate of water, that is, the drying rate of b, is obtained, and the latent heat of evaporation is 791 to 2 Il/h, and the ratio of the latent heat of evaporation to the input, that is, the drying efficiency, is 1.
With an input of 0.050 W, the water evaporation rate, that is, the drying rate, is 1 KP/h, and the drying efficiency is 65%, whereas the drying efficiency is approximately 2.
The drying efficiency is high, and the drying speed can be increased without increasing the heater input, or the heater input can be reduced at the same drying speed.

In this example, the first regeneration area and the second regeneration area were provided in series with respect to the rotational direction of the dehumidifier, but these regeneration areas were arranged concentrically, that is, in the radial direction as shown in FIG. If they are provided separately, the first regeneration area and the second regeneration area can be provided completely independently, thereby increasing the regeneration efficiency of each and allowing more efficient drying.

Effects of the Invention As described above, the present invention dries objects to be dried using a dehumidifier and regenerates the dehumidifier in the first step. By efficiently performing the drying with the second regeneration air, the drying efficiency can be greatly improved and the drying time can be shortened without increasing the heater input, which is of great value.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional example, FIG. 2 is a psychrometric diagram thereof, and FIG. 3 is a block diagram showing an embodiment of the present invention.
FIG. 4 is a psychrometric diagram thereof, and FIG. 5 is a perspective view showing the main structure of another embodiment. 5... Storage for items to be dried, 6... Dehumidifier, 7... Fan for blowing drying air, 9...
... Heater for regeneration, 10 ... Heat exchanger. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1; Figure 2 Beard/% ('a) Figure 3 Figure 4:, gJL Kubo (@C) Figure 5

Claims (2)

[Claims] (1) A fan that forms a circulation path for drying air between the drying material storage and the dehumidifier and circulates the drying air within the circulation path, a heater for regeneration of the dehumidifier, and a fan used for regeneration. It is equipped with a heat exchanger for recovering heat from the first regeneration air to the second regeneration air, and a fan for blowing the first and second regeneration air, and is heated by a regeneration heater. The first regeneration air regenerated by the dehumidifier is supplied to the heat exchanger,
The second regeneration air is heated in a heat exchanger with the first regeneration air in a dryer that regenerates a dehumidifier. (2) The dehumidifier is a rotary type having a vent in the axial direction, and the regions to be regenerated by the first and second regenerating air are respectively formed separately in the radial direction. dryer.