JP5743160B2 - UV irradiation equipment - Google Patents

Description

  The present invention relates to an ultraviolet irradiation device used for curing a resin, paint, ink, adhesive or the like.

  As this type of ultraviolet irradiation device, as shown in Patent Document 1, a straight tubular ultraviolet lamp, a housing for housing the ultraviolet lamp, an air supply structure and an exhaust structure for cooling the ultraviolet lamp are provided. There is something to prepare. The air supply structure and the exhaust structure each include an air supply duct and an exhaust duct extending in the longitudinal direction in the housing, respectively, and a blower and an exhaust air are provided at an air supply opening and an exhaust opening that are open on an end surface of the housing. Cooling gas is supplied and exhausted by connecting the device.

  More specifically, the flow of the cooling gas will be described. The cooling gas introduced from the air supply port first proceeds in the longitudinal direction in the air supply duct 41A, and as shown in the cross-sectional view of FIG. A discharge opening 411A that opens on the lower surface of the air duct 41A is supplied directly above the ultraviolet lamp 1A and near the lower surface opening of the housing 2A. Then, the cooling gas heated in the vicinity of the ultraviolet lamp 1A is sucked from a suction opening 511A formed obliquely above the ultraviolet lamp 1A formed on the side surface of the reflector 51B, and then in the exhaust duct 51A in the longitudinal direction. To the outside of the housing 2A from the exhaust port.

  However, in the exhaust structure thus configured, the cooling gas discharged from the discharge opening of the air supply duct is configured to flow along the outer surface of the exhaust duct, and thus reaches the ultraviolet lamp. In the meantime, heat exchange occurs with the warmed cooling gas flowing in the exhaust duct. For this reason, there is a problem that the temperature of the cooling gas rises before reaching the ultraviolet lamp from the air supply duct, and the cooling efficiency is lowered.

  Further, in the air supply structure and the exhaust structure of Patent Document 1, a cooling gas flows along a laminar flow on the side surface of the ultraviolet lamp and is then collected into the exhaust duct. A turbulent flow such as a vortex cannot be formed in the vicinity of the side surface of the plate, and sufficient heat transfer is not performed.

JP 7-256190 A

  The present invention has been made in view of the above-described problems. The cooling gas can be supplied from the air supply duct to the ultraviolet lamp while maintaining a low temperature state, and sufficient heat exchange is performed in the vicinity of the ultraviolet lamp. It aims at providing the cold ultraviolet irradiation device comprised so that it might occur.

  That is, the ultraviolet irradiation apparatus of the present invention accommodates a long ultraviolet lamp and the ultraviolet lamp, and has a long casing having an ultraviolet emission window for irradiating the irradiated object with ultraviolet rays from the ultraviolet lamp. A cooling duct that extends in the longitudinal direction in the body and that is supplied from outside and flows from one end side to the other end side, and the cooling gas from the supply duct to the vicinity of the ultraviolet lamp An air supply structure having a discharge flow path for discharging air, an exhaust duct that extends in the longitudinal direction in the housing, and that flows out from one end side to the other end side to be exhausted to the outside, and the ultraviolet lamp And an exhaust structure having a suction passage for sucking the cooling gas from the vicinity to the exhaust duct.

  Further, in the ultraviolet irradiation device of the present invention, the suction flow path flows along the inner surface of the exhaust nozzle extending from the exhaust duct to the vicinity of the ultraviolet lamp, and the ultraviolet emission window and the ultraviolet emission window on the side surface of the ultraviolet lamp. Is configured to suck the cooling gas from the opposite end side, and the discharge flow path flows along the outer surface of the exhaust nozzle, and is opposite to the ultraviolet emission window on the side surface of the ultraviolet lamp. The cooling gas is discharged to the side.

  In such a case, the cooling gas flows along the outer surface of the exhaust nozzle and then hits the ultraviolet lamp, and then flows along the inner surface of the exhaust nozzle and is sucked into the exhaust duct. The flow direction of the cooling gas can be greatly changed on the side surface of the lamp to form a turbulent flow such as a vortex in the vicinity of the side surface of the ultraviolet lamp, so that heat transfer efficiency can be improved. A sufficient amount of heat can be taken away.

  The cooling gas supplied to the ultraviolet lamp does not come into contact with the exhaust duct, makes it difficult to exchange heat with the heated cooling gas, and reaches the ultraviolet lamp while keeping the cooling gas at a low temperature. In order to improve the cooling efficiency by doing so, it is sufficient that the discharge flow path is formed at least a predetermined distance away from the exhaust duct.

  A flow path forming structure suitable for greatly changing the flow path directions of the discharge flow path and the suction flow path, and a configuration for cooling the reflecting member in the vicinity of the ultraviolet lamp with high efficiency For example, the suction flow path is formed by an exhaust nozzle extending from the exhaust duct to the vicinity of the ultraviolet lamp, and is disposed between the ultraviolet lamp and the exhaust duct, and is emitted from the ultraviolet lamp. And a reflection member that reflects the ultraviolet light to the ultraviolet emission window, and the discharge passage is configured to reach the ultraviolet lamp through the exhaust nozzle and the reflection member. .

  The ultraviolet lamp and the exhaust duct are kept close to each other so that the heated cooling gas is quickly exhausted outside so that heat is not trapped in the housing, and the air supply structure is in contact with the exhaust structure. As the arrangement of the members and the flow path configuration that can reduce as much as possible, when the cross section of the casing is viewed, the ultraviolet emission window, the ultraviolet lamp, the exhaust duct, and the air supply duct are arranged in this order. When the cross section of the housing is viewed, the exhaust nozzle extends linearly from the exhaust duct to the vicinity of the ultraviolet lamp, and the discharge passage extends from the air supply duct to the exhaust duct. The thing comprised so that a duct may be bypassed and the said ultraviolet lamp may be mentioned is mentioned.

  For example, in the normal mode in which the ultraviolet irradiation device operates at a high output, the reflecting member can be cooled together with the ultraviolet lamp, and the ultraviolet irradiation device is operated at a low output to enter a standby mode, so that the cooling to the reflecting member is not so necessary. In this case, in order to further improve the cooling amount of the ultraviolet lamp, the reflecting member reflects the ultraviolet ray emitted from the ultraviolet lamp on the ultraviolet emission window and the ultraviolet lamp. When the reflection member is in the reflection position, the discharge flow path is configured to be the exhaust nozzle and the reflection member. And reaches the ultraviolet lamp through the space between the reflecting member and the housing. When the reflecting member is in the blocking position only needs to be configured such that the reflecting member is closed between said housing.

  Thus, according to the ultraviolet irradiation device of the present invention, the discharge flow path is formed so that the cooling gas that has not reached the ultraviolet lamp flows to the ultraviolet lamp side along the outer surface of the exhaust nozzle. In addition, a suction flow path is formed in which the cooling gas sucked from the vicinity of the ultraviolet lamp flows along the inner surface of the exhaust nozzle, so that the flow direction of the discharge flow path and the suction flow path changes greatly. By doing so, a turbulent flow such as a vortex can be generated in the vicinity of the ultraviolet lamp. Accordingly, the heat transfer efficiency from the ultraviolet lamp to the cooling gas can be improved, and a larger amount of heat can be cooled from the ultraviolet lamp.

The typical perspective view of the ultraviolet irradiation device concerning one embodiment of the present invention. The schematic diagram which shows the housing | casing cross section in the same embodiment. The typical perspective view which shows the housing | casing longitudinal cross-sectional view in the same embodiment. The typical expanded sectional view of the vicinity of the ultraviolet lamp in the embodiment. The typical enlarged view which shows the partition plate in the embodiment. The elements on larger scale which show the holding structure of the ultraviolet lamp in the embodiment. The typical expanded view of a housing | casing cross section in case the reflection member of the ultraviolet irradiation device which concerns on another embodiment of this invention exists in a obstruction | occlusion position. The typical cross-sectional view which shows the air supply structure and exhaust structure in the conventional ultraviolet irradiation device.

  An ultraviolet irradiation apparatus 100 according to an embodiment of the present invention will be described with reference to the drawings.

  The ultraviolet irradiation device 100 according to the present embodiment cures the UV ink by irradiating the irradiated object (work) formed by applying UV ink or the like on a substrate such as paper or film. It is used to make it.

  Specifically, as shown in FIG. 1, the ultraviolet irradiation device 100 is emitted from a long ultraviolet lamp 1, a casing 2 having a substantially long rectangular parallelepiped shape that accommodates the ultraviolet lamp 1, and the ultraviolet lamp 1. A pair of reflecting members 3 that rotate between a reflecting position for reflecting the ultraviolet rays and a blocking position for blocking the ultraviolet rays from the ultraviolet lamp 1, and an air supply structure 4 for supplying cooling gas to the ultraviolet lamp 1. And an exhaust structure 5 for exhausting the cooling gas heated by the heat radiation of the ultraviolet lamp 1 to the outside of the housing 2. The air supply structure 4 and the exhaust structure 5 are provided with a buffer space between the structures so that heat conduction between the cooling gases flowing in the housing 2 is unlikely to occur.

  Each part will be described in detail.

  The ultraviolet lamp 1 is, for example, a mercury lamp or a metal halide lamp that emits ultraviolet light having a wavelength of 365 nm. Specifically, the ultraviolet lamp 1 has a long cylindrical shape made of quartz glass, and discharges, for example, argon (Ar) gas or the like in a sealed container having a circular cross section perpendicular to the axial direction. Gas, mercury iodide, iron iodide and the like are enclosed, and electrodes are provided at both ends between the cylinders.

  As shown in FIG. 1, the housing 2 has a substantially long rectangular parallelepiped shape, and has an ultraviolet emission window 21 for irradiating the workpiece with ultraviolet rays on the lower surface. The ultraviolet emission window 21 of the present embodiment is a substantially long rectangular shape formed on the lower surface of the housing 2 and is closed by a cover 22 having ultraviolet transparency. The ultraviolet emission window 21 may not be closed by the cover 22 but communicate with the work space.

  When the cross section of the central portion of the housing 2 is viewed, the ultraviolet emission window 21, the ultraviolet lamp 1, the reflecting member 3, and the exhaust structure 5 are sequentially formed from the lower surface of the housing 2 as shown in FIG. The respective constituent members are arranged in the order of (exhaust duct 51 described later) and the air supply structure 4 (air supply duct 41 described later).

  The pair of reflecting members 3 form a pair provided on both sides of the ultraviolet lamp 1 along the longitudinal direction of the ultraviolet lamp 1, and rotate around the ultraviolet lamp 1 attached to the housing 2. Thus, the light is rotated between a reflection position where the ultraviolet light emitted from the ultraviolet lamp 1 is reflected by the ultraviolet emission window 21 and a light shielding position where the ultraviolet light from the ultraviolet lamp 1 to the ultraviolet emission window 21 is blocked. The reflection position is a position where the inner surfaces of the pair of reflecting members 3 reflect ultraviolet rays emitted upward from the ultraviolet lamp 1 toward the work side (downward). The light shielding position is a position where the pair of reflecting members 3 is located between the ultraviolet lamp 1 and the ultraviolet emission window 21 and blocks ultraviolet rays to the ultraviolet emission window 21.

  The reflection member 3 configured as described above is provided on the other end side in the longitudinal direction of the casing 2 (on the back side in the present embodiment), for example, a drive mechanism using a cylinder drive system such as an air cylinder or an electric cylinder. (Not shown) is driven to open and close.

  As shown in FIG. 3, the air supply structure 4 introduces a cooling gas from the end surface of the housing 2, and then supplies the cooling gas to the ultraviolet lamp 1 from the inner surface of the housing 2. From another viewpoint, the air supply structure 4 forms a cooling gas flow path from the uppermost part in the housing 2 to the ultraviolet lamp 1 at the lower part as shown in the cross section of FIG. The air supply structure 4 includes a supply duct 41 extending in the longitudinal direction of the housing 2, that is, the same direction as the longitudinal direction of the ultraviolet lamp 1, and cooling gas from the supply duct 41 to the vicinity of the ultraviolet lamp 1. It is comprised from the discharge flow path 42 to supply.

  The air supply duct 41 is a cylindrical body having an octagonal cross section extending in the longitudinal direction in the housing 2 as shown in the cross sectional view of FIG. 2 and the cross sectional perspective view of FIG. An air supply port I is provided on one end side exposed to the outside of the housing 2. The air supply duct 41 in the vicinity of the air supply port I has a circular cross-sectional shape. A separate blower (not shown) is connected to the air supply port I so that cooling gas flows in the longitudinal direction from the air supply port I side to the other end side. In addition, when the cross section of FIG. 2 is viewed, a discharge opening 411 through which the cooling gas is discharged from the supply duct 41 to the discharge flow path 42 is symmetrically provided in the diagonally lower portion of the side surface of the supply duct 41. A plurality are provided extending in the longitudinal direction.

  The discharge passage 42 is a passage through which the refrigerant gas flows from the discharge opening 411 to the ultraviolet lamp 1 by bypassing the exhaust structure 5 as shown in the transverse sectional view of FIG. 2 and the sectional perspective view of FIG. . More specifically, the discharge flow path 42 includes an air supply nozzle 421 extending from the discharge opening 411 to the outer surface side of the reflection member 3, a gap P1 between the reflection member 3 and an exhaust nozzle 521 described later, and the A gap P <b> 2 between the reflecting member 3 and the inner surface of the housing 2 is formed.

  As shown in FIG. 2, the air supply nozzle 421 maintains the same width dimension as the discharge opening 411 and extends in the longitudinal direction, and is configured so that the cooling gas flows from the upper side to the lower side. It is. The cooling gas exiting the air supply nozzle 421 flows along the reflection member 3 and passes through the gap P1 between the upper portion of the reflection member 3 and the exhaust nozzle 521. The flow is divided into a flow path that flows obliquely from above and a flow path that flows downward along the reflection member 3 toward the ultraviolet emission window 21 and flows into the gap P <b> 2 between the reflection member 3 and the housing 2. That is, the cooling gas hits the ultraviolet lamp 1 at least on the side opposite to the side where the ultraviolet emission window 21 is located.

  The exhaust structure 5 is cooled so that the cooling gas in the vicinity of the ultraviolet lamp 1 is sucked upward, and the cooling gas is exhausted from the exhaust port E opened in the end surface of the housing 2 to the outside of the housing 2. A gas flow is formed.

  More specifically, as shown in FIG. 2, the exhaust structure 5 is disposed at the center in the cross section inside the housing 2, and the air in the vicinity of the ultraviolet lamp 1 is sucked upward. A flow path 52, an exhaust duct 51 that flows the cooling gas sucked from the suction flow path 52 in the longitudinal direction and is discharged to the outside from the exhaust port E, and a partition that partitions the inside of the exhaust duct 51 in the longitudinal direction It consists of a plate 512.

  The suction passage 52 is formed by an exhaust nozzle 521 extending from the suction opening 511 of the exhaust duct 51 to the vicinity of the ultraviolet lamp 1 as shown in FIG. The exhaust nozzle 521 extends in the longitudinal direction along the side surface in the upper part of the ultraviolet lamp 1, and the width thereof is set to about ３ of the diameter of the ultraviolet lamp 1. Since the exhaust nozzle 521 is arranged in this way, when the cooling gas hits the side of the ultraviolet lamp 1 from between the exhaust nozzle 521 and the reflecting member 3, the exhaust nozzle is bent after 90 degrees or more. 521 will be inhaled. In this way, since the cooling gas flow has a bend of 90 degrees or more and heat exchange is performed in a turbulent flow caused by a vortex or the like, the cooling gas flows in a laminar flow along the side surface of the ultraviolet lamp 1. Compared with this, heat exchange is more easily performed, and the cooling efficiency can be improved.

  Explaining the flow path structure more strictly, as shown in the enlarged sectional view of FIG. 4, the discharge flow path 42 passing through the gap P <b> 1 between the reflecting member 3 and the exhaust nozzle 521 extends along the outer surface of the exhaust nozzle 521. It is configured to flow and reach the side surface of the ultraviolet lamp 1, and the cooling gas flows from the ultraviolet lamp 1 to the exhaust duct 51 along the inner surface of the exhaust nozzle 521 and is sucked. It is. That is, by forming the discharge channel 42 and the suction channel 52 so as to flow along the outer surface and the inner surface of the exhaust nozzle 521, respectively, the channel direction of the suction channel 52 in the vicinity of the ultraviolet lamp 1, The flow path direction of the discharge flow path 42 is set so as to be substantially opposite, and is made to flow while contacting at substantially one point on the side surface of the ultraviolet lamp. By forming the flow path in this manner, the cooling gas can be supplied from the discharge flow path 42 to the ultraviolet lamp 1 at a predetermined flow rate or more by the nozzle effect, and the flow path direction can be changed most greatly. The heat transfer efficiency can also be good.

  Further, as shown in FIG. 6, several support rings 11 for suppressing the amount of deflection of the central portion of the ultraviolet lamp 1 are inserted into the gap between the exhaust nozzles 521. The support ring 11 is configured to be sufficiently small so as not to hinder the formation of the suction channel 52.

  The exhaust duct 51 is a substantially rectangular parallelepiped tubular body extending in the longitudinal direction as shown in FIG. 3, and has an exhaust port E to which an exhaust device (not shown) is connected at one end. The suction opening 511 extending in the longitudinal direction is formed at the center of the lower surface. The exhaust port E is opened on the same side as the end surface of the housing 2 where the air supply port I is opened, and a blower and an air exhaust device are connected to the air supply port I and the exhaust port E by one attachment. Are connected. As shown in FIGS. 2 and 3, the exhaust duct 51 is separated from the supply duct 41 and the supply nozzle 421 of the supply structure 4 by a predetermined distance, and a buffer space is formed therebetween. . For this reason, it is directly between the low-temperature cooling gas that is blown from the air supply port I and flows through the air supply structure 4 and the cooling gas that is flowing through the exhaust duct 51 and has already been heated to a high temperature. Heat conduction does not occur. Therefore, the temperature of the cooling gas can be kept low until it reaches the vicinity of the ultraviolet lamp 1, and the cooling efficiency of the ultraviolet lamp 1 with respect to the amount of the cooling gas blown can be further improved.

  The partition plate 512 partitions the upper and lower portions of the exhaust duct 51 so as to be divided into two spaces. That is, the partition plate 512 has the suction opening 511 open, the inflow space 51a in which cooling air flows from the exhaust nozzle 521 and temporarily stays therein, and the exhaust port E is open. An exhaust space 51b in which cooling gas flows in the longitudinal direction toward the mouth E is formed in the exhaust duct 51.

  As shown in FIGS. 3 and 5, the partition plate 512 is arranged such that the vent hole 513 is spaced apart from the suction opening 511 when the face plate portion of the partition plate 512 is viewed from the suction opening 511 side. is there. In other words, when viewed from a direction perpendicular to the face plate portion of the partition plate 512, the suction opening 511 and the vent hole 513 are arranged so as not to overlap each other.

  In addition, a plurality of the vent holes 513 are formed side by side in the longitudinal direction in the partition plate 512, and the density of the vent holes 513 is set so as to decrease toward the exhaust port E side. In the present embodiment, the vent holes 513 are set such that the number of the vent holes 513 on the side opposite to the exhaust port E is larger than that on the exhaust port E side. By doing so, the suction amount of the cooling gas is increased on the side opposite to the exhaust port where the suction force falls because it is away from the exhaust port E, and the suction amount of the cooling gas is increased on the exhaust port E side where the suction force becomes strong. Therefore, the cooling gas can be sucked uniformly in the longitudinal direction. Therefore, the long ultraviolet lamp 1 can be uniformly cooled.

  Next, the flow of the cooling gas and the cooling effect in the ultraviolet irradiation apparatus 100 of the present embodiment configured as described above will be described together.

  The inside of the exhaust duct 51 is partitioned in the longitudinal direction by the partition plate 512. Further, when the face plate portion of the partition plate 512 is viewed from the suction opening 511 side, the vent hole 513 extends from the suction opening 511. Since they are arranged apart from each other, the cooling gas sucked into the inflow space 51a from the vicinity of the ultraviolet lamp 1 through the suction opening 511 hits the face plate portion of the partition plate 512 and then enters the vent hole 513. It will flow. Then, the cooling gas passes through the vent hole 513 and flows into the exhaust space 51b, and then flows in the longitudinal direction toward the exhaust port E.

  Therefore, the cooling air that has flowed into the exhaust duct 51 does not immediately flow in the longitudinal direction toward the exhaust port E, but stays in the inflow space 51a for a predetermined time. Heat exchange with air in the vicinity of 1 can be performed, and the cooling efficiency with respect to the amount of cooling gas supplied from the air supply structure 4 can be increased.

  Further, a buffer space is provided between the air supply structure 4 before the cooling gas reaches the ultraviolet lamp 1 and the exhaust structure 5 after the cooling gas reaches the ultraviolet lamp 1. Since heat exchange is unlikely to occur between the cooling gases, a sufficiently low-temperature cooling gas can be supplied to the ultraviolet lamp 1 for cooling, and the cooling efficiency can be increased.

  Further, since the cooling gas is blown from above the ultraviolet lamp 1 through the gap between the reflecting member 3 and the exhaust nozzle 521 and is sucked by the exhaust nozzle 521, the discharge flow path 42 and the suction flow are The traveling direction of the path can be changed greatly to generate a turbulent flow such as a vortex, so that heat can be efficiently exchanged with the cooling gas.

  From these things, if it is the air supply structure 4 and the exhaust structure 5 of the ultraviolet irradiation device 100 of this embodiment, cooling efficiency can be improved significantly conventionally. Moreover, since the cooling gas is not taken in and out from the upper part of the housing 2, the dimension in the height direction of the ultraviolet irradiation device 100 can be reduced, so that not much space can be taken at the time of factory installation or the like.

  Other embodiments will be described.

  As shown in FIG. 7, the movement of the reflecting member 3 may change the form of the flow in the vicinity of the ultraviolet lamp 1 in the discharge flow path 42 to perform cooling according to the purpose.

  More specifically, in this embodiment, the reflecting member 3 reflects the ultraviolet rays emitted from the ultraviolet lamp 1 shown in the transverse sectional view of the housing 2 in FIG. 7 is configured to rotate and move between light blocking positions for blocking the ultraviolet rays from the ultraviolet lamp 1 to the ultraviolet emission window 21 shown in the transverse section of the housing 2 in FIG.

  When the reflecting member 3 is in the reflection position and the output of the ultraviolet lamp 1 is increased in order to irradiate the irradiation target with ultraviolet rays, as shown in FIG. Similarly, the discharge flow path 42 reaches the ultraviolet lamp 1 through the gap P1 between the exhaust nozzle 521 and the reflection member 3, and the gap P2 between the reflection member 3 and the housing 2 is formed. It passes through the ultraviolet lamp 1. The flow path passing through the gap P1 mainly cools the ultraviolet lamp 1, and the flow through the gap P2 cools the reflecting member 3 and the ultraviolet emission window 21 that are warmed by the heat radiation of the ultraviolet lamp 1 and the ultraviolet lamp. It is.

  On the other hand, in the standby state where the output of the ultraviolet lamp 1 is suppressed to the minimum necessary to maintain discharge so that the normal use state can be immediately restored, and when the reflecting member is in the light shielding position, FIG. As shown in FIG. 4, the P3 is closed between the reflecting member 3 and the housing 2.

  In this way, even in the standby state, the gap between the exhaust nozzle 521 and the ultraviolet lamp 1 can be maintained at the same distance as in the normal use state, and high cooling capacity can be maintained.

  In the embodiment, the exhaust structure is provided between the air supply structure and the ultraviolet lamp. However, the arrangement order is changed, and the air supply structure is provided between the exhaust structure and the ultraviolet lamp. It may be arranged.

  Further, the air supply port and the exhaust port may be opened on separate end faces of the housing. The discharge opening of the air supply duct may be configured such that the discharge amount of the cooling gas is constant in the longitudinal direction by increasing the opening area on the counter air supply port side than on the air supply port side. In addition, the air supply port and the exhaust port may be open on the upper surface, the lower surface, or the side surface of the housing, for example, instead of the end surface of the housing.

  The discharge flow channel and the suction flow channel are not formed by the air supply nozzle and the exhaust nozzle, respectively, but may be formed by using gaps between the inner surface of other housings and other members. Absent. Further, the angle of bending of the cooling gas generated by hitting the ultraviolet lamp may be a predetermined angle or more, and the cooling efficiency can be improved as compared with the case of forming a substantially laminar flow along the shape of the ultraviolet lamp. Anything is acceptable. When considered in the form of a cooling gas streamline in a cross-sectional view, it may be bent at an angle smaller than the angle shown in the above embodiment as long as it is in contact with the surface of the ultraviolet lamp at one point and bent. I do not care.

  More specifically, the outer surface shape of the exhaust nozzle may be appropriately changed to adjust the angle at which the discharge flow path is incident on the side surface of the ultraviolet lamp. For example, in the embodiment, since the tip of the exhaust nozzle is substantially plate-shaped, the flow direction of the discharge flow channel and the suction flow channel is approximately 180 degrees different from each other. By forming so as to bulge toward the base end side, a cooling gas is allowed to flow through the ultraviolet lamp at a desired incident angle, and the angle formed by the flow path direction of the discharge flow path and the suction flow path is smaller than 180 degrees. A desired angle can be obtained.

  The density of the air holes formed in the partition plate may be adjusted by the number of air holes per unit area, for example, the density may be adjusted by appropriately changing the opening area of the air holes. Good. Specifically, the installation interval of the air holes may be kept constant, the diameter of the air holes on the exhaust port side may be small, and the diameter of the air holes may be larger on the side opposite to the exhaust port. Further, the shape of the vent hole is not limited to the round hole shape, and may be various shapes such as a slit shape. Similarly, the shape of the discharge opening and the suction opening is not limited to the slit shape, and may be a round hole shape or the like.

  In addition, various modifications and combinations of embodiments may be performed without departing from the spirit of the present invention.

100: Ultraviolet irradiation device 1: Ultraviolet lamp 2: Case 21: Ultraviolet emission window 3: Reflecting member 4: Air supply structure 41: Air supply duct 411: Discharge opening 42: Discharge flow path 421: Air supply nozzle 5: Exhaust structure 51: Exhaust duct 51a: Inflow space 51b: Exhaust space 512: Partition plate 513: Vent hole 52: Suction passage 521: Exhaust nozzle E: Exhaust port I: Inlet port

Claims (5)

A long UV lamp,
A long casing having an ultraviolet exit window for housing the ultraviolet lamp and irradiating the irradiated object with ultraviolet rays from the ultraviolet lamp;
A supply air duct that extends in the longitudinal direction in the casing and includes a supply duct through which a cooling gas supplied from the outside flows, and a discharge passage that discharges the cooling gas from the supply duct to the vicinity of the ultraviolet lamp. Qi structure,
An exhaust structure that extends in the longitudinal direction in the housing and includes an exhaust duct through which cooling gas flows and exhausts to the outside, and an intake passage that sucks the cooling gas from the vicinity of the ultraviolet lamp into the exhaust duct; With
The suction flow path flows along the inner surface of an exhaust nozzle extending from the exhaust duct to the vicinity of the ultraviolet lamp, and sucks the cooling gas from the side opposite to the ultraviolet emission window on the side of the ultraviolet lamp. Is configured to
The discharge flow path flows along the outer surface of the exhaust nozzle, and is configured to discharge cooling gas to the side opposite to the ultraviolet emission window on the side surface of the ultraviolet lamp. UV irradiation device.   The ultraviolet irradiation device according to claim 1, wherein the discharge flow path is formed at least a predetermined distance from the exhaust duct. A reflection member disposed between the ultraviolet lamp and the exhaust duct, further comprising a reflecting member that reflects the ultraviolet light emitted from the ultraviolet lamp to the ultraviolet emission window;
The ultraviolet irradiation device according to claim 1, wherein the discharge flow path is configured to reach the ultraviolet lamp through between the exhaust nozzle and the reflection member. When viewing the cross section of the housing, each is arranged in the order of the ultraviolet emission window, the ultraviolet lamp, the exhaust duct, the air supply duct,
When the cross section of the housing is viewed, the exhaust nozzle extends linearly from the exhaust duct to the vicinity of the ultraviolet lamp,
The ultraviolet irradiation device according to any one of claims 1 to 3, wherein the discharge passage is configured to bypass the exhaust duct from the air supply duct and reach the ultraviolet lamp. The reflection member is configured to rotate between a reflection position for reflecting the ultraviolet light emitted from the ultraviolet lamp to the ultraviolet emission window and a light shielding position for blocking the ultraviolet light from the ultraviolet lamp to the ultraviolet emission window. And
When the reflection member is in the reflection position, the discharge flow path passes between the exhaust nozzle and the reflection member and reaches the ultraviolet lamp, and passes between the reflection member and the casing. Reaching the UV lamp,
5. The ultraviolet irradiation device according to claim 3, wherein, when the reflecting member is in the light shielding position, the reflecting member is configured to block between the housings.