JPS5849785B2 - Tunnel drying oven - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tunnel drying oven for drying relatively large objects.

A conventional tunnel type drying oven is shown in FIGS. 1 and 2.

As shown in FIG. 1, the tunnel type drying oven 1 includes a drying chamber 2, an air seal chamber 3, and an exhaust chamber 4.

The drying chamber 2 is shaped like a tunnel, and the object to be heated 5 is heated and dried inside the drying chamber 2.

The air seal chamber 3 is shaped like a tunnel, and is connected to the drying chamber 2.

This air seal chamber 3 prevents leakage of hot air generated in the drying chamber 2.

The front air exhaust chamber 4 has a tunnel shape and is connected to the air seal chamber 3.

This exhaust chamber 4 is provided with an exhaust port 6 at the top, and an exhaust fan 7 is installed outside of this exhaust port 6.

An exhaust hood 8 is formed inside this exhaust port 6.

That is, the hot air 9 leaking from the drying chamber 2 through the air seal chamber 3 is collected in the exhaust hood 8 and discharged from the exhaust port 6 by the exhaust fan 7.

Further, the exhaust chamber 4 has an opening 10, and the object to be heated 5 is carried into the drying chamber 2 through the opening 10 through the air seal chamber 3.

The object to be heated 5 is transported from the outside of the exhaust chamber 4 through the opening 10 into the exhaust chamber 4, through the air seal chamber 3, and then into the drying chamber 2.
This is carried out by a conveyor 11 that reaches the inside of the building.

This conveyor 11 is provided above, and suspends and conveys the object 5 to be heated.

Further, as shown in FIG. 3, this conveyor 11 is surrounded by a cover 12.

By the way, the hot air 9 leaking from the drying chamber 2 is caused by the inflow of cold air 14 from the exhaust chamber 4 along the floor surface 13.

Of course, if the air seal in the air seal chamber 3 is perfect, no leakage will occur.

Air sealing in the air sealing chamber 3 is performed by providing a blowout duct 15, a suction duct 16, and a mirror plate 17 in the air sealing chamber 3, as shown in FIGS. 2 and 3.

This blow-off duct 15 has a blow-off port 18, and the suction duct 1
6 has a suction port 19.

However, the conveyor 11 is installed passing through the exhaust chamber 4, the air seal chamber 3, and the drying chamber 2, and the conveyor 11 is connected to the cover 1.
2, the air seal effect does not reach the inside of this cover 12, and the hot air 9 along the conveyor 11
It is difficult to prevent leakage.

Since this hot air 9 contains toxic substances, it must be completely prevented from leaking into the workplace.

For this reason, as described above, the hot air 9 is exhausted from the exhaust port 6 by the exhaust fan 7 and guided to the purification device (not shown).

However, due to the suction force of the exhaust fan 7, a large amount of cold air 20 flows in from the opening 10, and this, together with the hot air 9, becomes exhaust gas 21 and is discharged from the exhaust port 6.

The amount of cold air 20 is more than twice the amount of hot air 9.

For this reason, the concentration of toxic substances decreases and the amount of exhaust gas 21 increases, so the purification device is required to have a large capacity and high performance.

That is, the conventional tunnel-type drying oven 1 had a drawback in that large equipment was required to purify the exhaust gas 21.

The present invention has been made to solve these drawbacks.
It is an object of the present invention to provide a tunnel type drying furnace that can easily purify exhaust gas.

The tunnel type drying furnace according to the present invention has a plurality of baffle plates installed in the air seal chamber to prevent leakage of hot air, and a plurality of baffle plates installed inside the exhaust port and on the floor of the exhaust chamber to air cool air. This prevents the inflow of hot air and the leakage of hot air.

Next, a first embodiment of the present invention will be described based on the drawings.

Here, the same or equivalent parts as in the conventional example are given the same reference numerals.
Explanation of these parts will be omitted.

As shown in FIG. 4, a plurality of baffle plates 23 are provided on the inner wall surface 22 of the air seal chamber 3 of the tunnel type drying oven 1.

As shown in FIG. 7, this baffle plate 23 protrudes toward the object to be heated 5 and has a gap 24 between it and the object to be heated 5. As shown in FIG.

This interval 24 allows almost all of the hot air 9 flowing out from the drying chamber 2 and the airflow 25 flowing out from the air outlet 18 of the suction duct 15 from the suction port 19 of the suction duct 16 within the range of the velocity distribution D1 of the suction air flow. The interval is set to maintain the strength of the suction airflow that can be sucked.

Further, as shown in FIG. 4, the exhaust hood 8 of the exhaust chamber 4 is provided with a plurality of baffle plates 26.

This baffle plate 26 extends in the vertical direction, and
1 and extends perpendicularly to the direction of extension of 1.

Therefore, the flow along the conveyor 11 is suppressed by the baffle plate 26.

Furthermore, a plurality of baffle plates 27 are provided on the floor surface 13 of the exhaust chamber 4.
is erected vertically.

An outside air suction blower 28 is installed below this baffle plate 27.

This outside air suction blower 28 is operated by a suction duct 29.
It communicates with an outside air suction port 30 between the baffle plates 27.

As shown in FIG. 9, between the heated object 5 and the upper end of the baffle plate 27, the strength of the suction airflow that has the power to overcome the infiltration of the outside air 14 is maintained within the range of the speed distribution D2 of the suction airflow. A gap 31 is formed.

As mentioned above, the baffle plate 23 is provided in the air seal chamber 3 to enhance the air sealing effect, but the baffle plate 26 in the exhaust chamber 4 is
．． 27 makes leakage of hot air 9 even more complete.

That is, as shown in FIG. 8, the hot air 9 flows into the exhaust hood 8 as an upward airflow 32 due to buoyancy and a horizontal airflow 33 due to the tunnel effect.

These air flows 32 , 33 are weakened by the baffle plate 26 and further blocked by the cold air 20 flowing in through the opening 10 .

At the same time, the cold air 2o is also weakened by the baffle plate 26.

This allows the exhaust port 6 to pass through the rising passage 34 in FIG.
The exhaust gas 21 discharged from the exhaust gas 21 has a high ratio of hot air 9 and a small amount.

Furthermore, the baffle plate 27 provided on the floor surface 13 weakens the cold air 14 flowing along the floor surface 13.

Then, a small amount of cold air 1 flows in by climbing over the baffle plate 27.
4 is sucked in from the outside air suction port 30 by the outside air suction blower 28 .

As a result, almost no cold air 14 flows into the drying chamber 2 from the air seal seat 35, and therefore almost no hot air 9 leaks out.

Therefore, in this embodiment, there is almost no leakage of the hot air 9, and the amount of exhaust gas 21 discharged from the exhaust port 6 is small and highly concentrated, so that the exhaust gas 21 can be easily purified.

Next, a second embodiment of the tunnel type drying oven according to the present invention will be described based on the drawings.

Here, the same or equivalent parts as in the first embodiment are given the same reference numerals, and the explanation of these parts will be omitted.

In FIG. 10, a suction duct 29 connected to the outside air suction port 3o is connected to a water tank 36.

An outside air suction blower 28 is connected to the top of this water tank via a filter 37.

Further, a pump 39 is connected to the outside air suction port 30 via a pipe 38.

This pump 39 is further communicated with a water tank 36 via a pipe 40.

That is, a circulation path is formed in which the pump 39 sucks water from the water tank 36, introduces it to the outside air suction port 30, and then drains water into the water tank 36.

This embodiment is designed to prevent the outside air suction port 30 and the suction duct 29 from being blocked and unable to prevent outside air 14 from entering when drying the object to be heated 5 on which an aqueous solution containing a sticky substance is dripped. It is something.

That is, the outside air suction port 30 and the suction duct 29 are contaminated by the aqueous solution containing the sticky substance dripping from the heated object 5, and as a result, the outside air suction port 30 and the suction duct 29 are blocked.

In this case, it becomes impossible to prevent the outside air 14 from entering, and in order to prevent this, in this embodiment, water is flowed through the outside air suction port 30 to form a water film on the surface of the outside air suction port 30, and the object to be heated 5 This prevents contamination caused by aqueous solution dripping from the tank.

Further, the aqueous solution that has passed through the outside air suction port 30 and the suction duct 29 is led to a water tank 36, and the water is used for circulation.

As described above, the tunnel type drying oven according to the present invention provides a plurality of baffle plates in the air seal chamber to prevent leakage of hot air,
Furthermore, since a plurality of baffle plates are provided inside the exhaust port and on the floor of the exhaust chamber to prevent the inflow of cold air and the leakage of hot air, an excellent effect is obtained in that the exhaust gas can be easily purified.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing a conventional example, Fig. 2 is a sectional view taken along the line of arrows 1-1 in Fig. 1, Fig. 3 is a sectional view taken along the line of arrow I-1 in Fig. The figure is a side sectional view showing one embodiment of the tunnel type drying oven according to the present invention, FIG. 5 is a sectional view taken along the line of arrows ■-■ in FIG. 4, and FIG. 7 is a plan view of the air seal chamber of the same embodiment, FIG. 8 is an enlarged view of the ■ section in FIG. 4, FIG. 9 is an enlarged view of the ■ section in FIG. 4, and FIG. The figure is a side sectional view showing a second embodiment of the tunnel type drying oven according to the present invention. 1... Tunnel drying oven, 2... Drying room, 3...
Air seal, 4...exhaust chamber, 6...exhaust port, 7...
・Exhaust fan, 9...hot air, 13...floor, 22.
...Inner wall surface, 23...Baffle plate, 26...Baffle plate, 2
7...Baffle board.

Claims (1)

[Claims] 1. A tunnel-shaped drying chamber, an air sealing chamber connected to this drying chamber and preventing hot air from leaking from the drying chamber, and an air sealing chamber connected to this air sealing chamber and leaking hot air from the drying chamber via the air sealing chamber. In a tunnel-type drying furnace, the air inside the air seal chamber is equipped with an exhaust chamber in which the air is discharged from an upper exhaust port by an exhaust fan, and a conveyor installed passing through the exhaust chamber, the air seal chamber, and the drying chamber. A tunnel type drying oven characterized in that a plurality of baffle plates are provided on a wall surface, inside an exhaust port of the exhaust chamber, and on a floor surface of the exhaust chamber.