JPH04306483A - Air circulation type drying machine - Google Patents

Abstract

PURPOSE:To provide an air circulation type drying machine capable of drying matters to be dried sufficiently in a short time and retaining the inside of a drying chamber in clean atmosphere. CONSTITUTION:A drying chamber 1 for receiving matters to be dried is provided with a communicating passage 2, connecting the lower part of the drying chamber 1 with the upper part of the same, a dust collecting filter 3, provided between said drying chamber 1 and the communicating passage 2, a far infrared ray heater 4, radiating electromagnetic waves against the drying chamber 1 through the dust collecting filter 3, and a fan 5, circulating air in the drying chamber 1 into said communicating passage 2 through said far infrared ray heater 4.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The invention of this application relates to a type of dryer (herein referred to as an air circulation type dryer) that circulates heated clean air and uses this air to dry objects to be dried. It is.

0002

[Prior Art] This type of dryer is shown in Fig. 4, for example.
There is something like this. As shown in the figure, this drying chamber 1 has a casing 9 formed in the shape of a rectangular parallelepiped, and has a drying chamber 1 for accommodating objects to be dried, and a communication passage 2 that communicates the lower and upper parts of the drying chamber 1. and a fan 5 provided above the communication path 2 to create a downward air flow.A dust collection filter 3 is provided downstream of the fan 5, and a sheathed heater 90 is provided upstream. (
The terms upstream and downstream mentioned above refer to the direction of air flow). In this dryer, the air intake port 91 is located on the outer wall of the communication path 2.

[0003] When using this dryer, first, the material to be dried is placed in the drying chamber 1, and then the fan 5 and heater 90 are turned on. Then, by the heater 90,
The temperature of the surrounding air (ambient temperature) is heated and raised, and the heated air is circulated by the fan 5 through the path of dust collection filter 3 → drying chamber 1 → communication path 2. .

[0004] Therefore, the objects to be dried stored in the drying chamber 1 are dried by purified heated air. However, the dryer described above has a problem in that it takes a long time to sufficiently dry the material to be dried. (See line B in FIG. 3) This is because the dryer heats the material to be dried only by conduction through air, and therefore it takes a long time for so-called start-up.

On the other hand, as shown in FIG. 5, there is a drying device which has the same basic structure as the one described above, but the heater 90 is placed in the upper part of the drying chamber 1. In this one, drying room 1
Since the radiant heat from the heater 90 directly acts on the objects to be dried housed inside, the objects to be dried can be dried in a short time. (See line C in FIG. 3) However, in this air circulation dryer, dust that could not be collected by the dust collection filter 3 or that was attracted to the drying chamber 1 from the outside accumulates on the upper surface of the heater 90. However, there is a problem in that the accumulated dust is scattered due to the turbulent flow within the drying chamber 1 caused by the presence of the heater 90. That is,
With this, a predetermined level of cleanliness within the drying chamber 1 cannot be ensured.

[0006]

[Problems to be Solved by the Invention] Therefore, the invention of this application shortens the time required for rising, allows the drying object to be sufficiently dried in a short period of time, and maintains a clean atmosphere inside the drying chamber. Our objective is to provide an air circulation dryer.

[0007]

[Means for Solving the Problems] The invention according to claim 1 of this application relates to an air circulation dryer, in which a lower part and an upper part thereof are connected in communication with a drying chamber 1 for accommodating objects to be dried. A far-infrared heater 4 is provided with a communication path 2, a dust collection filter 3 is provided between the drying chamber 1 and the communication path 2, and a far-infrared heater 4 that emits electromagnetic waves toward the drying chamber 1 through the dust collection filter 3. Furthermore, the communication path 2 described above is provided with a fan 5 that circulates the air in the drying chamber 1 via the far-infrared heater 4.

Regarding the invention set forth in claim 1 of this application, the dust collecting filter 3 is disposed in the upper part of the drying chamber 1, and the far infrared heater 4 is provided above the dust collecting filter 3. The radiation direction of the electromagnetic waves in the far-infrared heater 4 may be set downward.

[0009]

[Operations] The invention of this application has the following functions. fan 5
When the far-infrared heater 4 is turned on, the air inside the air circulation dryer flows through the far-infrared heater 4 arrangement section → the dust collection filter 3 → the drying chamber 1 → the communication path 2 → the far-infrared heater 4 arrangement part. As a result, the atmospheric temperature within the drying chamber 1 rises as in the conventional drying chamber. That is, the material to be dried in the drying chamber 1 is heated by conduction through the air.

Furthermore, in the invention of this application, since the electromagnetic waves from the far infrared heater 4 are radiated into the drying chamber 1 through the dust collection filter 3, in addition to the above-mentioned effects, the drying chamber 1 Radiant heat is applied to the objects to be dried housed inside, and the objects to be dried are heated. On the other hand, in this case, since the dust collection filter 3 is interposed between the far-infrared heater 4 and the drying chamber 1, even if dust accumulates on the upper surface of the far-infrared heater 4, the A large amount of dust will not be scattered inside the drying chamber 1.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the invention of this application will be explained below with reference to the drawings showing examples. This example is an air circulation type dryer used in a clean room, which sucks purified air from the clean room through the air intake and uses this air to cleanly dry the target. It is used to dry objects such as jigs.

As shown in FIG. 1, a rectangular parallelepiped-shaped casing 9 having a heat insulating material on its inner surface is provided with a partition wall 8 that divides the inside of the casing 9, and the casing 9 is connected to the drying chamber 1. It constitutes a passage 2. Partition wall 8 mentioned above
As shown in FIG. 1, it is composed of a vertical wall 80, an upper horizontal frame 81, and a horizontal frame 82. is installed at a constant distance from the rear wall of the casing 9, and the communication path 2 described in the means column is connected to the space between the rear wall of the casing 9 and the vertical wall 80, and between the upper wall of the casing 9 and the lower horizontal frame 82. It consists of a space of

In this embodiment, as shown in the figure, the fan 5 for air circulation is attached to the upper horizontal frame 81, and the dust collecting filter 3 having a corrugated cross section is attached to the lower horizontal frame in an airtight manner around the outer periphery. On the other hand, a plurality of far-infrared heaters 4 are arranged between the fan 5 and the dust collection filter 3 in such a manner that the radiation direction of electromagnetic waves is on the drying chamber 1 side.

In this case, an air intake port 91 is formed in the rear wall of the casing 9 constituting the communication passage 2, and as shown in FIG. 2, the front wall constituting the drying chamber 1 can be opened and closed. The door is designated as 92. Since the air circulation type dryer of this embodiment is configured as described above, the material to be dried stored in the drying chamber 1 is heated by conduction and radiation, as described in the operation section. As a result, the rise time can be shortened, and the material to be dried can be sufficiently dried in a short period of time. Furthermore, since the dust collection filter 3 is interposed between the far-infrared heater 4 and the drying chamber 1, even if dust accumulates on the upper surface of the far-infrared heater 4, a large amount of the accumulated dust can be dried. They will not be scattered inside the drying chamber 1, and as a result, the cleanliness inside the drying chamber 1 can be ensured.

The rise time of the dryer of this embodiment is shown as a line in FIG. 3. The specifications of the dryer used in this experiment and the conventional dryer are as follows. (Common parts between the dryer of this embodiment and the conventional one) Casing 9: Height 1800 x Width 800 x Depth 1000 Drying room 1: Height 1450 x Width 800 x Depth 750
Circulation air volume: Approx. 60m3/min M
AX drying temperature: 40°C (Differences between the dryer of this example and the conventional one) Heater of conventional dryer: Sheath type heater, 2.0
kw Heater of the dryer in this example: far infrared heater, 1.2
kw From Figure 3 above, the time required for startup is approximately 2 minutes in the dryer of this embodiment, compared to 20 minutes in the conventional type dryer, which is approximately 1/10 the time required. I can see that.

[0016]

Effects of the Invention Since the invention of this application has the above-described configuration, it has the following effects. Since the material to be dried stored in the drying chamber 1 is heated by conduction and radiation, the rise time can be shortened, and even if dust is deposited on the upper surface of the far-infrared heater 4, the A large amount of dust will not be scattered inside the drying chamber 1.

[0017] Therefore, it is possible to provide an air circulation type dryer which can sufficiently dry objects to be dried in a short time and can maintain a clean atmosphere inside the drying chamber.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an air circulation dryer according to the invention of this application.

FIG. 2 is a front view of the air circulation dryer.

FIG. 3 is a diagram showing the rise time of the air circulation dryer and that of a conventional type.

FIG. 4 is a sectional view of a conventional air circulation dryer.

FIG. 5 is a cross-sectional view of another conventional type of air circulation dryer.

[Explanation of symbols]

1 Drying room 2 Communication path 3 Dust collection filter 4 Far infrared heater 5 Fan

Claims (2)

[Claims] 1. A drying chamber 1 for accommodating objects to be dried is provided with a communication passage 2 that communicates and connects a lower part and an upper part of the drying chamber 1, and a dust collection space is provided between the drying chamber 1 and the communication passage 2. Filter 3
In addition, a far-infrared heater 4 is provided that emits electromagnetic waves toward the drying chamber 1 through the dust collection filter 3, and the air in the drying chamber 1 is supplied to the communication path 2 through the far-infrared heater 4. An air circulation dryer characterized in that it is equipped with a fan 5 that circulates air. 2. The dust collection filter 3 is disposed in the upper part of the drying chamber 1, the far infrared heater 4 is provided above the dust collection filter 3, and the radiation direction of electromagnetic waves in the far infrared heater 4 is directed downward. The air circulation type dryer according to claim 1, characterized in that the air circulation type dryer is set to .