JPH05277421A - Drying oven - Google Patents

Abstract

PURPOSE:To simply and economically clean an object to be treated such as a filter to which tar or the like is bonded on the spot. CONSTITUTION:A heat treatment chamber 30 formed so as to be accessible to an object Q to be treated is provided in the vicinity of a deodorizing apparatus 20 and a bypass duct 35 guiding the high temp. gas heated by burner 22 forming the deodorizing apparatus 20 is provided to the heat treatment chamber 30 and a damper device 4OA for introducing and cutting off the high temp. gas is provided to the bypass duct 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying oven equipped with a heating type deodorizing device.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing a schematic configuration of a drying furnace equipped with a conventional catalytic combustion type deodorizing device.

In a conventional drying furnace, a hot air supply device is supplied to the furnace body 1 while the object W to be coated such as an automobile body is conveyed by a conveying means 51 (for example, an overhead conveyor 52 and a hanger 53) in the longitudinal direction of the tunnel type furnace body 1. 10 is used to circulate and supply hot air to a predetermined temperature (for example, 120 to 140 ° C.)
In general, the coating film electrodeposited on the surface of the article W is baked and dried. In many of such drying furnaces, a heating type deodorizing device 20 is provided so that exhaust gas from the furnace body 1 is deodorized and released into the atmosphere.

More specifically, the hot air supply device 10 comprises a burner 11, a filter 12, a circulation fan 13, a circulation duct 14 and the like.

The deodorizing device 20 heats and deodorizes exhaust gas containing a harmful odorous substance that evaporates from the coating film of the article W, and is roughly classified into a catalytic combustion type and a direct thermal baking type. The deodorizing device 20 shown in FIG. 5 is a catalytic combustion type,
It is connected to the furnace body 1 via an exhaust duct 5. The deodorizing device 20 includes a catalyst 21 that burns and decomposes harmful odorous substances in exhaust gas, a catalyst heating burner 22 that heats the catalyst 21 to a predetermined processing temperature (for example, 300 to 350 ° C.), and the like. .. Where the burner 22
The catalyst 21 and the catalyst 21 are connected by a deodorizing duct 23. The exhaust gas deodorized by the deodorizing device 20 is conveyed in the discharge duct 9 by the discharge fan 7 and is discharged to the atmosphere.

In FIG. 5, 6 is an exhaust fan for sending the exhaust gas generated in the furnace body 1 to the external deodorizing device 20. Further, 8 is a heat exchanger, which is interposed in the middle of the discharge duct 9. The heat exchanger 8 serves to preheat the exhaust gas introduced into the device 20 by utilizing the heat of the exhaust gas heat-treated in the deodorizing device 20.

[0007]

By the way, in the above-mentioned drying furnace, when the hot air supply device 10 and the like are driven to bake and dry the object W to be coated for a considerable period of time, the filter 12
The tars and paint dregs adhere to and the filtration function deteriorates.

Therefore, it is necessary to clean the filter 12 in order to restore the filtration function. However, such cleaning work is time-consuming and labor-intensive and requires a dedicated processing facility. The actual situation is to entrust a cleaning company. Similarly, a cleaning company is entrusted with the cleaning work of the hanger 53 of the transporting means 51 to which tar and paint dregs adhere, and the slats forming the floor surface. The cleaning company takes the consigned filter 12 and the like back to the company and heats it with a dedicated heating device to remove tars and the like.

However, if the cleaning of the filter 12 and the like is entrusted to a contractor in this way, the cleaning work will take too much time and there is a problem from the economical point of view.

In view of the above circumstances, an object of the present invention is to provide a drying oven which can easily and economically clean an object to be treated such as a filter on site.

[0011]

A drying furnace according to the present invention is
In a drying furnace that is provided with a heating-type deodorizing device connected to the furnace body through an exhaust duct and is configured to discharge exhaust gas after deodorizing treatment to the outside through a discharge duct, an object to be treated is placed in the vicinity of the deodorizing device. In order to provide a heat treatment chamber that can be moved in and out, and to provide a bypass duct that introduces high temperature gas heated by a burner that forms a deodorizing device to this heat treatment chamber, and to introduce and block high temperature gas in this bypass duct It is characterized in that a damper device is provided.

[0012]

In the present invention having the above-described structure, the object to be treated (for example, a filter or a hanger to which tar and paint dregs are attached) is placed in a heat treatment chamber, and a deodorizing device is provided in the heat treatment chamber by using a damper device and a bypass duct. When the high temperature gas heated by the burner is introduced, the object to be processed is heated and the paint residue and the like are burned and removed.

Since the heat treatment chamber is provided in the vicinity of the deodorizing device, a worker on site can easily clean the object to be treated. Further, since the heat of the burner of the deodorizing device is used, the facility cost and running cost are not so high and the economical efficiency can be improved.

Therefore, the object to be processed can be cleaned on site easily and economically.

[0015]

1 is a diagram for explaining a first embodiment of the present invention, FIG. 2 is an external perspective view of a heat treatment chamber, FIG. 3 is a diagram showing a second embodiment of the present invention, and FIG. 4 is a book. It is a figure for demonstrating the 3rd Example of invention.

Embodiments of the present invention will be described with reference to the drawings. (First Embodiment) As shown in FIG. 1, the drying furnace according to the present embodiment uses a high temperature gas generated in a deodorizing device to heat and remove tars and the like adhering to a filter. Exhaust duct 5, hot air supply device 10, catalytic combustion type deodorizing device 2
0, and the heat treatment chamber 30 and the damper device 40A, which are the features of the present drying furnace. The same components as those shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

Here, the heat treatment chamber 30 includes the deodorizing device 20.
Is disposed in the vicinity of, and is formed so that the object to be processed Q such as the filter 12 and the hanger 53 to which the tar or the paint residue adheres can enter and leave. In this embodiment, the heat treatment chamber 30
As shown in FIG. 2, the box-shaped main body 31 and the main body 31
And an opening / closing door 32 for letting the object to be processed Q in and out. The main body 31 has a closed heat insulating structure and is provided so as to be able to accommodate the object to be processed Q. Further, the opening / closing door 32 is provided on the main body 31 so as to be openable and closable, and is configured to be sealed with the main body 31 when closed.

The bypass duct 35 is a means for introducing high temperature gas heated by the burner 22 constituting the deodorizing device 20 into the heat treatment chamber 30. In the present embodiment, the bypass duct 35 is an upstream side portion 36 that connects the deodorizing duct 23 portion in the immediate vicinity of the burner 22 and the heat treatment chamber 30.
And a downstream side portion 37 that connects the deodorizing duct 23 portion near the catalyst 21 and the heat treatment chamber 30.

Further, the damper device 40A introduces the high temperature gas heated by the burner 22 into the bypass duct 35.
A means for shutting off the dampers 41a, 41b,
41c and each drive motor (not shown) for driving the dampers 41a to 41c to open and close. Here, the damper 41a is the deodorizing duct 2 between the upstream and downstream portions 36, 37 of the bypass duct 35.
It is arranged in three parts. In addition, the dampers 41b, 41
c is disposed in the upstream side portion 36 and the downstream side portion 37 of the bypass duct 35. In addition, each drive motor is configured to be controlled by using a partial function of a control device (not shown) that controls the drive of the entire drying oven.

When a cleaning start button (not shown) is pressed, the control device drives the exhaust fan 6 and the burner 22 and closes the damper 41a and the damper 4 as well.
Each drive motor is drive-controlled so that 1b and 41c are opened. When a cleaning stop button (not shown) is pressed, the damper 41a is opened and the dampers 41b, 4
The drive motors are controlled so that 1c is closed.

Next, the operation will be described. To clean the object to be processed Q, first, the object to be processed Q is housed in the main body 31 by opening / closing the opening / closing door 32 of the heat treatment chamber 30. After the accommodation, when the cleaning start button is pressed, the control device drives the exhaust fan 6 and the burner 22, and the damper 41a of the damper device 40A is closed, and the dampers 41b, 4b.
Each drive motor is drive-controlled so that 1c is opened.

As a result, the high temperature gas heated by the burner 22 is introduced into the heat treatment chamber 30 through the upstream portion 36 of the bypass duct 35 to heat the object to be treated Q, and then the downstream portion 37 through the catalyst 21. Sent to the side. As a result, the object to be processed Q is heated by the high temperature gas (300 to 350 ° C.), and the tar and the like attached to the object to be processed Q are burned and removed.

Since the heat treatment chamber 30 is provided in the vicinity of the deodorizing device 20, the worker at the work site receives the object Q to be treated.
Can be easily cleaned. In addition, the deodorizing device 20
Since the heat of the burner 22 is used, the facility cost and running cost are not so high, and the economical efficiency can be improved.

According to the first embodiment, however, the heat treatment chamber 30 is connected to the deodorizing duct 23 of the deodorizing device 20 via the bypass duct 35, and the high temperature gas heated by the burner 22 is connected to the bypass duct 35. Since the damper device 40A for introducing and shutting off the workpiece is provided, the object to be processed Q can be cleaned easily and economically on site.

Further, since the heat treatment chamber 30 has the closed heat insulating structure, the object to be treated Q can be heated with high thermal efficiency and cleaned more rapidly and economically.

(Second Embodiment) As shown in FIG. 2, the drying furnace according to the second embodiment has a catalytic combustion type deodorizing device 20, and a heat treatment chamber 30 is disposed near the deodorizing device 20. As described above, the damper device 40B is connected to the discharge duct 9 and the discharge duct 5 via the bypass duct 35, and the bypass duct 35 is provided with a damper device 40B for introducing / shutting off the high temperature gas heated by the burner 22. Is characterized by.
The same components as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted or simplified.

Here, the upstream portion 36 of the bypass duct 35 communicates the discharge duct 9 portion upstream of the heat exchanger 8 with the heat treatment chamber 30, and the downstream portion 37 of the duct 35 is the exhaust fan 6. It is provided so as to connect the portion of the exhaust duct 5 on the upstream side to the heat treatment chamber 30.

Further, the damper device 40B includes the damper 4
2a, 42b, 42d, and drive motors (not shown) for opening and closing the dampers (42 to 42d). The damper 42a is arranged in a portion of the discharge duct 9 upstream of the heat exchanger 8. Also, the damper 42
b and 42c are upstream parts 36 of the bypass duct 35,
It is arranged in the downstream portion 37. Also, the damper 42
d is disposed upstream of the connecting portion of the bypass duct downstream side portion 37 of the discharge duct 5. Each drive motor of the damper device 40B is configured to be drive-controlled by a control device.

Therefore, when the object to be processed Q housed in the heat processing chamber 30 is heat-treated, the damper 42a,
42d is closed and dampers 42b and 42c are opened, and the high temperature gas heated by the burner 22 is circulated and supplied to the processing chamber 30.

Here, the heat treatment chamber 30 includes the deodorizing device 20.
Since it is provided in the vicinity of, the worker at the site can easily clean the object to be processed Q.

Further, the hot gas heated by the burner 22 can be circulated and supplied to the heat treatment chamber 30 to more effectively remove and clean the tar and the like adhering to the object to be treated Q.

(Third Embodiment) As shown in FIG. 4, the drying furnace according to the third embodiment has a direct combustion type deodorizing device 20 ', and the heat treatment chamber 30 is located near the deodorizing device 20'. Is connected to the discharge duct 9 and the discharge duct 5 via the bypass duct 35 so as to be disposed in the
5 is provided with a damper device 40C for introducing / shutting off the high temperature gas heated by the burner 22. The same components as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be simplified or omitted.

Here, the deodorizing device 20 'is the burner 2
2'is included, and the exhaust gas sent from the furnace body 1 is directly heated to a high temperature (700 to 750 ° C in this embodiment) for deodorization.

The upstream side portion 3 of the bypass duct 35
Reference numeral 6 communicates the portion of the discharge duct 9 in the immediate vicinity of the burner 22 ′ with the heat treatment chamber 30, and the downstream portion 3 of the duct 35.
7 is provided so as to connect the exhaust duct 5 upstream of the exhaust fan 6 and the heat treatment chamber 30.

Further, the damper device 40C includes the damper 4
3a, 43b, 43c, 43d and each damper (43a
Up to 43d) are opened and closed by a drive motor (not shown). The damper 43a is provided downstream of the upstream duct partial connection portion of the bypass duct 35 of the discharge duct 9. The dampers 43b and 43c are provided on the upstream side portion 36 and the downstream side portion 37 of the bypass duct 35. Further, the damper 43d is arranged on the upstream side of the downstream duct partial connection portion of the bypass duct 35 of the discharge duct 5. Each drive motor is drive-controlled by the control device.

Since the exhaust gas conveyed in the discharge duct 9 has a high temperature, the hot air supply device 10 is constructed so as to circulate the hot air into the furnace body 1 by utilizing the exhaust gas. Therefore, the burner (12) is unnecessary.

Therefore, when the object to be processed Q housed in the heat processing chamber 30 is heat-treated, the damper 43a,
43d is closed and the dampers 43b and 43c are opened, and the hot gas (700 to 750 ° C.) heated by the burner 22 is circulated and supplied to the processing chamber 30.

Here, the heat treatment chamber 30 includes the deodorizing device 2
Since it is provided in the vicinity of 0 ', the worker at the site can easily clean the object to be processed Q.

In addition, a high temperature gas (700
(About 750 ° C.) is circulated and supplied, so that the tar and the like adhering to the object to be treated Q can be removed more rapidly and reliably.

[0040]

According to the present invention, a heat treatment chamber is formed in the vicinity of a deodorizing device so that an object to be treated can move in and out, and a high temperature gas heated by a burner forming the deodorizing device is provided in the heat treatment chamber. The bypass duct that guides the gas and the damper device that introduces and blocks high-temperature gas are installed in this bypass duct, so that the object to be treated such as a filter to which tars and paint dregs are attached can be easily and on-site. Can be cleaned economically.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a first embodiment of the present invention.

FIG. 2 is an external perspective view showing a heat treatment chamber.

FIG. 3 is a diagram for explaining a second embodiment of the present invention.

FIG. 4 is a diagram for explaining a third embodiment of the present invention.

FIG. 5 is a diagram showing a schematic configuration of a drying furnace provided with a conventional catalytic combustion type deodorizing device.

[Explanation of symbols]

 1 Furnace Main Body 5 Exhaust Duct 20 Deodorizer 30 Heat Treatment Chamber 35 Bypass Duct 40A Damper Device

Claims (1)

[Claims] 1. A drying furnace provided with a heating-type deodorizing device connected to a furnace body through an exhaust duct, and configured to discharge exhaust gas after deodorizing treatment to the outside through a discharge duct, in the vicinity of the deodorizing device. In addition to the heat treatment chamber formed so that the object to be treated can be moved in and out, a bypass duct for introducing the high temperature gas heated by the burner forming the deodorizing device is provided in this heat treatment chamber, and the high temperature gas is introduced into this bypass duct. A drying furnace equipped with a damper device for introducing and shutting off.