JPH07270072A - Dryer - Google Patents

Abstract

PURPOSE:To remarkably lower the thermal energy loss of a drying furnace and to effectively prevent the stain and breakage due to a resin by providing a hot air outflow controller for forming a sealing flow in one direction at lower speed than the air flow of an air curtain unit. CONSTITUTION:A hot air outflow controller 20 is provided in the intermediate zone 7 of a drying furnace 2 and includes blow-off ports 21, an inlet 23 and an air feed source 25 so that a sealing flow at lower speed than the air flow of an air curtain unit 10 can be formed in one direction. Air is blown off from the slit blow-off nozzles 11 of the air curtain unit 10 at high speed so that an air curtain is formed. A seal motor 26M is driven to blow off air from the blow-off ports 21 in a wide range so that the sealing flow is formed in one direction. Herein, the pressure of the sealing flow is set to a value slightly higher than that of a hot air in the main body 2D of the drying furnace 2 under the same pressure and air quantity as those of the air curtain of the air curtain unit 10. Thus, the outflow of the hot air in the main body 2D of the drying furnace 2 is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying device used for drying a work (for example, painted small parts, automobile body, etc.).

[0002]

2. Description of the Related Art In a conventional drying device, a work (for example, painted small parts) W is conveyed by a conveyor 9 as shown in FIG.
The main body 2 of the drying oven 2 with (conveyor rail 9R, hanger 9H, etc.)
Hot air convection zone 2H1 in D (or radiation heating zone 2H
It is generally configured to heat-dry while 2) is continuously conveyed. Here, the inside and outside of the drying furnace 2 are often shut off by using the air curtain unit 10P, which has a small installation space and can keep equipment costs low.

As shown in FIGS. 5 and 6, the conventional air curtain unit 10P includes a slit blowing nozzle 11, a blowing duct 12, a suction port 13, an air circulating device 15 (circulating fan 16, air curtain motor 17, dust removing filter). 1
8, ducts 19A, 19B, 19C), and the air AR blown from the slit blow nozzle 11 is sucked into the suction port 13
The air curtain AC that shuts off the inside of the drying furnace 2 from the outside is formed by being sucked into the. The slit blowing nozzle 11 is formed in a vertically elongated shape so as to blow out a predetermined amount of air AR supplied from the air circulation device 15 at high speed (for example, 6 m / s).

The air A sucked from the suction port 13
R is the duct 19A, the filter 18 and the duct 19B
Is introduced into the circulation fan 16 through the duct 19C, is again introduced into the blowout duct 12 through the duct 19C, and is blown out from the slit blowout nozzle 11.

[0005]

By the way, in the above conventional drying apparatus, the work W is the air curtain unit 1.
When passing through the 0P air curtain AC, the air curtain A
The air flow (AR) forming C hits the work W strongly and laterally flows in the work conveyance direction. As a result, the airflow AC air-flow shutoff function is impaired, and incomplete shutoff of air inside and outside the furnace occurs. Further, fluctuations due to changes in the flow rate of hot air in the main body 2D of the drying furnace 2 and the action of the air flow outside the furnace may impair the air curtain AC air flow blocking function, resulting in incomplete shutoff inside and outside the furnace. .

When such a situation occurs, the air curtain AC
The hot air in the main body 2D of the drying furnace 2 flows out of the furnace through the upper part of the above, or the cold outside air flows into the main body 2D of the drying furnace 2 through the lower part, and the heat energy loss of the drying furnace 2 is reduced. As the number of paints increases, the paint tar contained in the outflowing hot air condenses and contaminates outside the structure of the air curtain unit 10P or outside the furnace, and the tar peels off from the structure due to vibration and the like to the work W being conveyed. Adverse effects occur that adhere and impair the surface finish.

In view of the above circumstances, an object of the present invention is to provide a drying device capable of significantly reducing heat energy loss of a drying furnace and effectively preventing tar stain.

[0008]

A drying apparatus according to the present invention is a drying apparatus having an air curtain unit on the outlet side of a drying furnace, wherein the intermediate zone between the outlet of the main body of the drying furnace and the air curtain unit is provided. A hot air outflow suppressing device is provided, which includes a blowout port, a suction port, and an air supply source, and forms a seal flow at a lower speed than the air flow of the air curtain unit in one direction.

[0009]

In the present invention having the above-mentioned structure, air is blown out from the air outlet in the intermediate zone to form a seal flow in one direction. This seal flow exerts pressure on the air curtain unit side and the main body side, and even if the outside air passing through the air curtain unit tries to flow into the main body, it can be pushed back to the outside. Further, it is possible to push back that hot air is about to flow out from the inside of the main body into the main body.

Even when the work passes through the intermediate zone, the seal flow is slower and slower than the air flow of the air curtain unit, so that the disturbance of the seal flow due to the work passage is small and the air flow blocking function is not impaired. Therefore, it is possible to sufficiently shut off the inside and outside of the drying furnace without allowing the air flow inside and outside the main body of the drying furnace to pass through. Further, since the force exerted on the work by the seal flow is reduced, even if the work is, for example, small parts, it is not shaken, and the work is not conveyed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, this drying apparatus has the same basic configuration (drying furnace 2, conveyor 9, air curtain unit 10, etc.) as the conventional example (FIGS. 5 and 6), and a hot-air outflow suppression device. 20 is provided so that a seal flow can be formed in the intermediate zone 7 between the outlet 3 of the main body 2D of the drying furnace 2 and the air curtain unit 10. It should be noted that the same components as those of the conventional example (FIGS. 5 and 6) are designated by the same reference numerals, and the description thereof will be simplified or omitted.

First, the hot air outflow suppressing device 20 is used in the drying furnace 2.
Is provided in the intermediate zone 7 of the air curtain unit 10 and includes an outlet 21, an inlet 23, and an air supply source 25, and is configured to be able to form a seal flow in one direction at a lower speed than the air flow of the air curtain unit 10. . In this embodiment, the flow velocity of the seal flow is set to 1 m / s or less (particularly 0.3 to 0.5 m / s). In addition, the air volume of the seal flow is determined by the air curtain unit
It is considered to be equivalent to the air flow rate of 0.

As shown in FIG. 1 and FIG. 2, the outlets 21 are blowout ducts 2 provided on both sides of the drying furnace 2 in the width direction.
2 is formed so as to face the work W. In the present embodiment, the work W is a painted small part, and is continuously transported in the longitudinal direction in the drying furnace 2 along the transport rail 9R while being suspended from the hanger 9H of the conveyor 9.

Further, the blow-out port 21 is larger in size in the work transfer direction and in the vertical direction than the slit blow-out nozzle 11 of the air curtain unit 10 and forms a large opening. A panel surface filter 21F for equalizing the blown air flow is attached to the outlet 21. The suction port 23 is formed so that air can be sucked into a suction duct 24 provided in the upper portion of the intermediate zone 7.

The air supply source 25 is the circulation fan 2
6, a seal motor 26M, ducts 29A and 29B, and is formed to be able to supply air of a predetermined pressure to the air outlet 21 of the air outlet duct 22. In the present embodiment, it is assumed that the air that is higher than the maximum working pressure in the main body 2D of the drying furnace 2 by about 1 mmAq and has the same air flow as the air flow of the air curtain unit 10 is supplied. The circulation fan 26 is connected to the suction duct 24 via a duct 29A, and is connected to the blowout duct 22 via a duct 29B. The circulation fan 26 is configured to be rotationally driven by the seal motor 26M.

The duct 29A is provided with an air volume adjusting automatic damper 27. The air volume adjusting automatic damper 2
Reference numeral 7 has a configuration in which the opening degree is adjusted by a damper motor 27M.

Further, in this embodiment, as shown in FIG.
An air curtain unit 10A having the same configuration as the air curtain unit 10 on the outlet side described above on the inlet 4 side of the drying furnace 2 as well.
Is provided and the air curtain unit 10
A hot air outflow suppression device 20A having the same configuration as the hot air outflow suppression device 20 on the outlet side is provided in the intermediate zone 8 between the inlet and the main body 2D of the drying furnace 2. The air curtain unit 10A on the inlet side and the hot air outflow suppression device 20
A is provided in a symmetrical relationship with the air curtain unit 10 and the hot air outflow suppressing device 20 on the outlet side.

Thus, by providing the air curtain unit 10A and the hot air outflow suppressing device 20A on the inlet side of the drying furnace 2, the work W is carried into the main body 2D of the drying furnace 2 without adhering dust or the like. The workpiece W can be heated and dried, and the work W can be dried with higher quality.

Next, the operation of this embodiment will be described. Slit blowing nozzle 1 of air curtain unit 10
Air is blown out at high speed from 1 to form an air curtain, and at the same time, the seal motor 26M is driven to blow out air from the blowout port 2
Air is blown out from a wide area from 1 to form a seal flow in one direction.

Here, the seal flow has the same pressure and the same air volume as the air curtain of the air curtain unit 10 and the drying furnace 2.
Slightly smaller than the hot air in the main body 2D (1 mmA in this embodiment)
q) Since the pressure is set high, the main body 2 of the drying oven 2
It is possible to push back the hot air in D that is about to flow out. Further, it is possible to push back the outside air that has temporarily passed through the air curtain unit 10 to try to flow into the intermediate zone 7.

Further, even when the work W passes through the intermediate zone 7, since the seal flow is set to a low speed (0.3 to 0.5 m / s), the seal flow is less disturbed and the air flow blocking function is impaired. I don't know. Therefore, the airflow inside and outside the drying furnace 2 is not allowed to pass, and the inside and outside of the furnace can be sufficiently shut off.

Further, the force exerted by the seal flow on the work W is small, and the work W does not swing greatly. As a result, the work W can be transported without any trouble.

Therefore, according to this embodiment, the drying oven 2
A hot-air outflow suppression device 20 that includes a blowout port 21, a suction port 23, and an air supply source 25 in the intermediate zone 7 on the outlet side of the hot air outflow suppression device 20 that forms a seal flow that is slower than the air flow of the air curtain unit 10 in one direction is provided. With this configuration, it is possible to significantly reduce the heat energy loss of the drying furnace 2 and effectively prevent the tar stain.

Further, since the hot air outflow suppressing device 20A having the same structure is provided in the intermediate zone 8 on the inlet side of the drying furnace 2, the heat energy loss of the drying furnace 2 can be further reduced and at the same time, It is possible to effectively prevent tar stains.

[0025]

According to the present invention, the intermediate zone between the outlet of the drying furnace and the air curtain unit includes the air outlet, the suction port, and the air supply source, and the air flow of the air curtain unit is higher than the air flow in the one direction. Since the hot-air outflow suppressing device that forms a low-speed seal flow is provided, it is possible to significantly reduce the heat energy loss of the drying furnace and to effectively prevent tar stain.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an example of the present invention.

FIG. 2 is likewise a transverse sectional view of the intermediate zone.

FIG. 3 is also a diagram for explaining an air curtain unit and a hot air outflow suppressing device provided on the inlet side of the drying device.

FIG. 4 is a side sectional view for explaining a conventional configuration of a drying device.

FIG. 5 is likewise a side sectional view for explaining the air curtain unit.

FIG. 6 is likewise a cross-sectional view for explaining the air curtain unit.

[Explanation of Codes] 2 Drying Furnace 2D Main Body 3 Main Body Outlet 10, 10A Air Curtain Unit 20, 20A Hot Air Outflow Suppression Device 21 Air Outlet 23 Suction Inlet 25 Air Supply Source

Claims (1)

[Claims] 1. A drying device having an air curtain unit on the outlet side of a drying furnace, wherein a blowout port, a suction port, and an air supply source are provided in an intermediate zone between the main body outlet of the drying furnace and the air curtain unit. A drying device comprising a hot air outflow suppressing device that forms a seal flow that is slower than the air flow of the air curtain unit in one direction.