JPH0330863A - Cooling blow duct apparatus - Google Patents

Abstract

PURPOSE:To uniformize cooling capacity by equal wind velocity by connecting a fan case having an axial fan to a duct having an inclined surface toward a ventilation port by a connection part having a blow passage formed thereto and forming an airflow control plate to the blow passage. CONSTITUTION:The ventilation port 8 of a duct device 7 is opened to the upper part of the frame body 4 of an irradiation ventilating unit 2 equipped with a reflecting body 3 having a high voltage discharge lamp 1 enclosed therein. An axial fan 10 is driven by the lighting of the high voltage discharge lamp 1 and the air sucked from the opening part of a fan case 11 is sent to a duct 14 through a blow passage 15 of a connection part 16 to cool the reflecting body 3 of the frame body 4. The air stream is controlled by the airflow control plate 18 formed to the blow passage 15 in the vicinity of the wing part 17 of the axial fan 10 in a direction of 60-90 deg. and the flow rate of the air flowing toward the center of the duct 14 increases. By this constitution, the velocity of cooling air becomes almost uniform over the total length of the duct in the longitudinal direction of the emitting port and cooling can be made uniform.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention relates to a cooling air duct device, and is used in the printing process of, for example, printed plywood, printed wiring boards, or newspaper printing. This invention relates to a cooling air duct device used to cool an ultraviolet irradiation high-pressure discharge lamp of an ultraviolet irradiation device that irradiates ultraviolet rays onto a substrate coated with paint, ink, etc. to cure the paint, ink, etc.

(Prior Art) Conventional ultraviolet irradiation devices emit ultraviolet rays using, for example, high-pressure discharge lamps such as high-pressure mercury lamps and metal Harald lamps, and these high-pressure discharge lamps are generally of the straight tube type with a long arc tube length. is often used. However, recently, high-power discharge lamps with a large wattage per unit length have been used, and these high-pressure discharge lamps emit not only ultraviolet rays but also heat rays such as visible and infrared rays. The temperature of equipment such as the reflector containing the lamp may rise, causing thermal damage to the equipment, or
There is a problem of thermal damage to the irradiated object.

Therefore, in the conventional ultraviolet irradiation device, an exhaust passage is provided above the reflector and communicates with the internal space of the high-pressure discharge lamp along almost the entire length in the longitudinal direction of the high-pressure discharge lamp. A structure is known in which air is exhausted and outside air is sucked in through an irradiation opening or the like to cool a high-pressure discharge lamp, a reflector, or the like. In this conventional ultraviolet irradiation device, the air in the internal space of almost the entire length of the high-pressure discharge lamp is exhausted through the exhaust passage. The capacity differs in the longitudinal direction, and the cooling of the high-pressure discharge lamp becomes uniform in the longitudinal direction.<<, the surface temperature distribution of the high-pressure discharge lamp becomes uneven in the longitudinal direction,
There is a problem that the lighting state of the high pressure discharge lamp, that is, the ultraviolet irradiation ability becomes unstable.

Therefore, a configuration can be considered in which cooling air is generated using an axial fan and this cooling air is supplied from a duct.

(Problems to be Solved by the Invention) In the device that supplies the cooling air generated by the axial fan from the duct, the wind speed at the center is lower than at both ends in the longitudinal direction of the duct, resulting in uneven air volume. In ultraviolet irradiation equipment, the cooling of the high-pressure discharge lamp becomes uneven in the longitudinal direction, and the surface temperature distribution of the high-pressure discharge lamp becomes uneven in the longitudinal direction, making the lighting state of the high-pressure discharge lamp, that is, the ultraviolet irradiation ability unstable. At the same time, there is a problem in that the restartability of high-pressure discharge lamps is poor.

The present invention has been made in view of the above-mentioned problems, and even when the discharge port of the duct is long in the longitudinal direction, cooling air is discharged at an even speed over substantially the entire length, and the cooling air is discharged over substantially the entire length of the discharge port in the longitudinal direction. It is an object of the present invention to provide a cooling air duct device that can supply a uniform amount of air over the entire length and make the cooling capacity uniform over substantially the entire length.

[Structure of the invention]

(Means for Solving the Problems) The cooling air duct device of the present invention includes a fan case in which an axial fan is disposed, and an end face in the longitudinal direction from the air supply side toward the narrow groove-shaped discharge port. The duct is made up of a duct whose width is expanded in an inclined manner and the width of the duct is narrowed in an inclined manner, and a connecting part in which an air passage is formed to connect the discharge side of the fan case and the air supply side of the duct. Air volume control plates are formed in the width direction from a position near the base of the blade of the axial fan on both ends of the air passage formed in the connecting part toward the duct side, and the air volume control plates control the air volume. It is characterized in that it is formed in a direction of approximately 60° to 9G' from the horizontal plane inside the base on the fan case side of the plate toward the vertical direction that is the axial direction of the axial fan.

(Function) In the present invention, the cooling air generated by driving the axial fan is blown from the fan case to the duct via the air passage of the connecting portion, and is discharged from the outlet of the duct. The cooling air discharged from the outlet of the duct is controlled by an air volume control plate from a position near the base of the blade of the axial fan in the connection part toward the duct side. Approximately 60 degrees to 9 (10
By forming the cooling air in the direction of , cooling air is discharged at a uniform wind speed over substantially the entire length in the longitudinal direction of the discharge opening of the duct, and the volume of cooling air is increased.

(Example) Hereinafter, a cooling air duct device in which the configuration of an example of the present invention is implemented in an ultraviolet irradiation device will be described.

In FIGS. 1 and 2, the ultraviolet irradiation device includes a straight tube-shaped high-pressure discharge lamp 1 and an irradiation ventilation unit 2.

The high pressure discharge lamp 1 is made of, for example, a high pressure mercury lamp, a metal Harald lamp, etc.
When turned on, ultraviolet rays, visible light, infrared rays, etc. are emitted.

The irradiation ventilation unit 2 includes a reflector 3 that includes a high-pressure discharge lamp 1 and a frame 4 that supports the reflector 3 downward in an enlarged opening state. An internal space 5 for the discharge lamp 1 is formed, an irradiation opening 6 is opened in the lower surface of the frame 4, and a discharge port 8 of a duct device 7 is formed in the upper center along the longitudinal direction of the lamp 1. The reflector 3 includes a high refractive index layer made of, for example, titanium oxide (TiO2), zirconium oxide (2rO2), etc., and a silica (SiO□ ), low refractive index layers made of magnesium fluoride (Mgh), etc. are deposited alternately. The reflector 3 on which this multilayer interference coating is formed is a high-pressure discharge lamp 1.
It effectively reflects ultraviolet rays with wavelengths of 200 to 400n11 emitted from It allows infrared rays of QQnm or higher to pass through, and also allows some visible light rays to pass through.

The duct device 7 also includes a fan case 11 in which an electric axial fan 10 is disposed, and both end surfaces 12 in the longitudinal direction inclined from the air supply side toward the narrow groove-shaped discharge port 8. When expanded, both sides 13 in the width direction are reduced in width in an inclined manner, and a duct 14 is formed in which the discharge port 8 at the lower end is shaped like a long and narrow groove and the air supply side at the upper end is approximately square in shape, and the fan case 11 has a discharge outlet. The connecting portion 16 has an air passage 15 formed therein to connect the side and the air sending side of the duct.

Then, from a position outside the bearing (not shown) of the axial fan 10, which is a position near the base of the blade part 17 of the axial fan 10 on both end sides of the air passage 15 formed in the connecting part 16, Air volume control plate 18 in the width direction toward the duct 14 side
are formed respectively. The air volume control plate 18 is oriented approximately 60' to 9G' from the horizontal plane inside the base on the fan case 11 side of the air volume control plate 18 in the vertical direction, which is the axial direction of the axial fan 10, at an optimal angle. is formed in the θ angle direction of approximately 80°.

In addition, when the length of the discharge port 8 of the duct device 7 in the longitudinal direction is long, the duct device 7 can also be divided into a plurality of units in the longitudinal direction.

Next, the operation of this embodiment will be explained.

When the high-pressure discharge lamp 1 is turned on, ultraviolet rays, visible rays, and infrared rays are emitted. A portion of the light rays and heat rays such as infrared rays pass through the reflector 3 and are absorbed inside the frame 4.

On the other hand, when the high-pressure discharge lamp 1 is lit, the axial fan 10 of the duct device 7 is driven, and the air sucked in from the top opening 19 of the fan case 11 is transferred to the air passage 1 of the connecting portion 16.
5 to the air supply side of the duct 14. The air supplied to the blowing side of the duct 14 becomes cooling air and is exhausted from the discharge port 8 into the enclosed space 5 of the lamp 1, and the cooling air cools the high-pressure discharge lamp 1, the reflector 3, and the like.

At this time, air volume control plates 18 in the width direction are formed from positions near the base of the blade portions 17 of the axial fan 10 on both ends of the air passage 15 formed in the connecting portion 16 toward the duct 14 side. Therefore, the airflow supplied to the duct 14 is controlled by the airflow control plate 18, and the airflow flowing towards the center in the longitudinal direction of the duct 14 increases. Since it is formed in a direction of about 60' to 90 degrees from the horizontal plane inside the base on the fan case II side to the vertical direction which is the axial direction of the axial fan 10, the airflow exhausted from the discharge port 8 is The cooling air has a uniform wind speed over the entire length in the longitudinal direction, and even if the arc tube length of the high-pressure discharge lamp 1 is long, the amount of air flow in the longitudinal direction of the lamp 1 is small, and the cooling capacity is uniform, so that the high-pressure discharge lamp 1 The surface temperature distribution in the longitudinal direction can be made uniform, and the lighting state of the high-pressure discharge lamp 1, that is, the ultraviolet irradiation ability can be stabilized.

In addition, when each duct device 7 is divided into a plurality of units in the longitudinal direction, the drive of each fan 10 is different from that of the high-pressure discharge lamp 1 because, for example, heat generation is different between both ends and the center of the high-pressure discharge lamp 1. Since heat generation differs at each location in the longitudinal direction of the high-pressure discharge lamp 1, adjustment settings are made corresponding to each location in the longitudinal direction of the high-pressure discharge lamp 1. The operation of each fan 10 can also be controlled individually.

Next, the inventor's experimental results will be explained.

In the duct device 7 used in the experiment, as shown in FIG. The length was 125 mm, and the duct diameter was 80 mm. Further, the inclination of both end surfaces 12 of the duct 14 is 70°.

As a result of measuring the wind speed at each position in the longitudinal direction of the discharge port 8 shown in FIG. 3, the following results were confirmed.

When θ of the air volume control board 18 is 90° The amount is 0. It became 31,425m371n.

When θ of the air volume control board 18 is 80', the difference between the average maximum wind speed and the average minimum wind speed is 0.34n.
/S, the average wind speed is 3.98n/S, and the air volume is 0. 2
It became 985m'/lin.

When θ of the air volume control board 18 is 70'', the difference between the average maximum wind speed and the average minimum wind speed is 0.39n.
/S, the average wind speed is 4.19+*/S, and when θ of the air flow control plate 18 is 40', the difference between the maximum average wind speed and the minimum average wind speed is 0.39n.
/S, the average wind speed is 3.74n/S, and the air volume is 0. 2
The distance was 805m'/l1in.

When θ of the air volume control board 18 is 6G', the difference between the average maximum wind speed and the average minimum wind speed is 0.81n.
/S, the average wind speed is 3.02n/S, and the air volume is 0.22
It became 65 m'/sin.

When there is no air volume control plate 18, the difference between the average maximum wind speed and the average minimum wind speed is 0.57n.
/S, the average wind speed is 3.67II/S, and the air volume is 0.2
It became 7525m3/l1in.

And the difference between the average maximum wind speed and the average minimum wind speed is 2.53n
+/S, the average wind speed is 3.72m/S, and the air volume is 0.
It became 279 m3/l1in.

From the above experiments, it was found that by forming the air volume control plate 18, the difference between the average maximum wind speed and the average minimum wind speed becomes smaller, and the wind speed is made equal over substantially the entire length of the discharge port 8 of the duct 14 in the longitudinal direction. It's obvious.

In addition, by setting the angle θ of the air volume control plate 18 to 60° to 90°, there is no decrease in the average wind speed, and in particular, by setting the angle θ of the air volume control plate 18 to 80°, the average maximum wind speed and the minimum wind speed The difference from the average is small, and the discharge port 8 of the duct 14
It is clear that the wind speed is most equalized over substantially the entire length in the longitudinal direction.

〔Effect of the invention〕

According to the present invention, the end face in the longitudinal direction is expanded in an inclined manner from the discharge side and the air supply side of the fan case in which the axial fan is disposed inside toward the narrow groove-shaped discharge port, and the side face in the width direction The connection part, which has an air passage formed inside that connects the duct with the air supply side of the duct whose width has been reduced in an inclined manner, extends from a position near the base of the blade of the axial fan on both ends of the air passage to the duct side. They form air volume control plates in the width direction, and the air volume control plates are arranged at an angle of about 60° to a vertical direction, which is the axial direction of the axial fan, from the horizontal plane inside the base on the fan case side of the air volume control plates. Since it is formed in the direction of 9G', with a simple configuration, the speed of the cooling air from the duct outlet is approximately equal over the entire length in the longitudinal direction of the duct outlet, and a uniform air volume can be obtained. The cooling capacity can be made uniform by reducing the difference in air ventilation in the direction, and the surface temperature distribution in the longitudinal direction of the high-pressure discharge lamp can be made uniform.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of an ultraviolet irradiation device implementing the cooling air duct device of the present invention, FIG. 2 is a longitudinal sectional side view of the same, and FIG. 3 is an explanatory diagram of the same experiment. 7. Duct device, 8. Discharge port, 1o. Axial fan, 11. Fan case, 14. Duct, 15. Air duct, 16. Connecting section, 17. Wing section, 18.・Air volume control board.

Claims (1)

[Claims] (1) A fan case with an axial fan installed inside, and a longitudinal end face that expands in an inclined manner from the air supply side toward a narrow groove-shaped discharge port, and a widthwise side face that narrows in an inclined manner. the axial flow fan, and a connecting part having an air passage formed therein that connects the discharge side of the fan case and the air supply side of the duct; An air volume control plate is formed in the width direction from a position near the base of the blade section toward the duct side, and this air volume control plate is formed from a horizontal plane on the inside of the base on the fan case side of the air volume control plate of the axial fan. A cooling air duct device characterized in that it is formed in a direction of approximately 60° to 90° in the vertical direction, which is the axial direction.