JPH0712893U - drying furnace - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate insufficient heating in the center of a tall work and enable uniform heating and drying. [Structure] The furnace body 1 is provided with throttle portions (31, 32) that substantially reduce the cross-sectional area of the hot air flow passage in the same height region as the central portion of the tall work.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drying oven. Specifically, the present invention relates to a drying furnace capable of uniformly heating and drying tall works such as aluminum sash building materials that are long in the vertical direction.

[0002]

[Prior art]

 FIG. 3 is a cross sectional view showing a conventional structure of a drying furnace, FIG. 4 is a side sectional view of the same, and FIG. 5 is a view showing an example of a tall work.

In FIGS. 3 and 4, reference numeral 1 is a furnace body of a drying furnace. Inside the furnace body 1, there is provided a hot air forming means 10 for heating and drying a tall work W which is conveyed in the longitudinal direction of the furnace body 1 (direction orthogonal to the paper surface in FIG. 3) by the conveying means 5 (conveying rail 6 or the like). Has been. Here, the tall work W (height dimension H) is, as shown in FIG. 5, a plurality of objects to be heated (here, aluminum sash construction) supported by the transfer jig 9 in the upward and downward directions at predetermined intervals. It is made of material 8). The tall work W may be formed of a single object to be heated that is long in the vertical direction (for example, height dimension H = 2 m). In FIG. 3, 7 is an entrance / exit of a tall work W.

The hot air forming means 10 positively utilizes the fact that the temperature of the air, which is higher than the ambient air, rises due to the density difference in order to improve the equipment economy, and moves from the lower part to the upper part in the furnace body 1. The hot air blowing duct 11, the suction duct 13, the falling duct 15, and the hot air circulating device 21 are means for forming hot air that rises.

As shown in FIGS. 3 and 4, the hot-air blowing ducts 11 are arranged on both sides of the lower part of the furnace body 1, and are directed toward the lower part Wl of the tall work W conveyed in the furnace body 1. It has an outlet 12 capable of blowing hot air (Q) at a right angle.

The suction duct 13 is arranged in the upper portion of the furnace body 1 and has a suction port 14 for sucking air in the furnace body 1. Usually, the number of the suction ducts 13 is set to be smaller than that of the hot air blowing ducts 11 in order to suppress the fluctuation of the air temperature in the furnace body 1.

The hot air circulation device 21 is formed so as to suck and introduce air in the furnace body 1 from the suction port 14 of the suction duct 13 and to circulate and supply the air to the hot air blowing duct 11 after heating. The fan 22, the heater (burner 23), the blower 24, and the falling duct 15 are included.

Therefore, the air in the furnace body 1 (including the air from the blower 24) sucked from the suction port 14 of the suction duct 13 by driving the circulation fan 22 is heated to a predetermined temperature (for example, 250 ° C.) by the burner 23. ), Is supplied to the hot air blowing duct 11 through the falling duct 15, and is blown from each outlet 12 toward the lower portion Wl of the tall work W. The hot air Q blown out heats the central portion Wm and the upper portion Wu of the work W while rising inside the furnace body 1 toward the upper portion, and is sucked into the suction port 14 of the suction duct 13.

As described above, the tall work W conveyed in the furnace body 1 is heated and dried by the hot air Q circulated and supplied into the furnace body 1.

[0010]

[Problems to be solved by the device]

 By the way, in the above-mentioned drying furnace, the lower part W1 of the tall work W is heated well because the hot air is blown from the outlets 12 in the direction orthogonal to each other, and the upper part Wu thereof stays at the high temperature inside the furnace body 1 Although it is not heated insufficiently by being heated by air, its central portion Wm tends to be insufficiently heated.

Therefore, in order to prevent such inconvenience, it is conceivable to form the hot-air blowing duct 11 in a vertically longer direction so that hot air can be blown to the central portion Wm of the work W from a direction orthogonal to the central portion Wm. However, this would increase the size of the equipment and increase the cost.

In view of the above circumstances, an object of the present invention is to provide a drying furnace capable of eliminating insufficient heating of the central portion of a tall work and uniformly heating and drying the tall work.

[0013]

[Means for Solving the Problems]

 The drying furnace according to the present invention has a hot air forming means for forming hot air rising from the lower part to the upper part in the furnace body, and is capable of heating and drying a tall work carried in the furnace body by the hot air. In the above, the furnace body is provided with a throttle portion that substantially reduces the cross-sectional area of the hot air flow passage in the same height region as the central portion of the tall work.

[0014]

[Action]

 In the case of the present invention configured as described above, the tall work conveyed in the furnace is heated and dried by hot air. At this time, the hot air is forcibly reduced in the cross-sectional area of the flow passage as it passes through the narrowed portion, so that the rising speed is amplified and the flow rate in contact with the central portion of the tall work is increased. As a result, heat transfer to the central portion of the tall work is promoted, and insufficient heating of the central portion of the work is eliminated.

[0015]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the present drying furnace has the same basic configuration (furnace body 1, conveying means 5, hot air forming means 10, etc.) as the conventional example (FIGS. 3 and 4), and the squeezing section (31). By reducing the flow passage cross-sectional area of the hot air Q, the hot air flow rate in contact with the central portion Wm of the tall work W is increased to promote heat transfer. The same components as those of the conventional example (FIGS. 3 and 4) are designated by the same reference numerals, and the description thereof will be omitted or simplified.

The throttle portion is a means for substantially reducing the flow passage cross-sectional area of the hot air Q in the same height region as the central portion Wm of the tall work W. In the present embodiment, the narrowed portion is formed by sectional partition plates 31, 31 arranged on both sides of the work W so as to face the central portion Wm and the upper portion Wu of the tall work W. The sectional partition plate 31 is attached to the inner wall surface of the furnace body 1 via a mounting member, and is formed of a plate member having a high heat radiation property. Examples of the plate member include a smooth surface-treated steel plate, a smooth black skin thin steel plate, and a black skin thin steel plate. In this embodiment, the black skin thin steel plate is selected.

Next, the operation of this embodiment will be described. The tall work W conveyed in the furnace body 1 is heated and dried by the hot air Q. At this time, when the hot air Q passes through the narrowed portion (between the partition plates 31 and 31), the cross-sectional area of the flow passage is forcibly reduced, so that the rising speed is amplified and the central portion Wm of the tall work W is The contacting flow rate is increased. As a result, heat transfer to the central portion Wm of the tall work is promoted, and the insufficient heating of the central portion Wm of the work is resolved.

Therefore, according to this embodiment, the throttle portions (31, 31) that substantially reduce the flow passage cross-sectional area of the hot air in the furnace body 1 in the same height region as the central portion Wm of the tall work W 1. Since the above configuration is provided, the rising speed of the hot air Q is increased in the workpiece central portion Wm, and heat transfer to the workpiece central portion Wm is promoted. As a result, insufficient heating of the central portion Wm of the tall work W can be eliminated.

Further, since the sectional partition plate 31 is formed of a black skin thin steel plate, it is possible to further promote the temperature rise of the central portion Wm of the tall work W by the thermal radiation of the heated steel plate surface. It is possible to more efficiently eliminate the insufficient heating of the central portion Wm.

Although the narrowed portion is formed by the sectional partition plates 31 and 31 arranged to face the tall work center Wm, the cross-sectional area of the hot air flowing around the work center Wm is substantially the same. Any method can be used as long as it can reduce For example, as shown in FIG. 2, the narrowed portion may be formed by fin members 32, 32 that are arranged so as to face the tall work central portion Wm. The fin member 32 is formed of a plurality of horizontal plate members 33 arranged vertically with a supporting shaft member 34 at predetermined intervals.

[0021]

[Effect of device]

 According to the present invention, the furnace body is provided with the throttle portion that substantially reduces the cross-sectional area of the hot air flow passage in the same height region as the central portion of the tall work, so that the central portion of the tall work is reduced. Insufficient heating can be eliminated and the work can be heated uniformly.

[Brief description of drawings]

FIG. 1 is a cross-sectional view for explaining an embodiment of the present invention.

FIG. 2 is also a diagram for explaining a modified example of the diaphragm unit.

FIG. 3 is a cross-sectional view showing a conventional configuration of a drying furnace.

FIG. 4 is likewise a side sectional view.

FIG. 5 is a diagram showing an example of a tall work.

[Explanation of symbols]

 1 Furnace Body 10 Hot Air Forming Means 31 Cross Section Partition Plate (Throttle Portion) 32 Fin Member (Throttle Portion)

Claims (1)

[Scope of utility model registration request] 1. A drying oven having hot air forming means for forming hot air rising from the lower part to the upper part in the furnace body and capable of heating and drying a tall work carried in the furnace body by the hot air, A drying furnace, wherein the body is provided with a throttle portion that substantially reduces the cross-sectional area of the hot air flow passage in the same height region as the central portion of the tall work.