JP4029380B2 - UV irradiation equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ultraviolet irradiation device including a low-pressure mercury lamp in which a discharge tube portion is held by a holding portion.
[0002]
[Prior art]
Such an ultraviolet irradiation device is used for various applications such as sterilization and washing by using ultraviolet rays emitted from a low-pressure mercury lamp.
The low-pressure mercury lamp used in this ultraviolet irradiation device cools the holding part that holds the discharge tube part so that the mercury vapor pressure in the discharge tube becomes an appropriate vapor pressure during light emission operation, and near the attachment part of the holding part It is necessary to store mercury condensed in liquid form in the discharge tube.
Also, the discharge tube portion of the low-pressure mercury lamp also requires some cooling means because the surface of the discharge tube becomes as high as 100 ° C. to several hundred ° C.
[0003]
In order to cool the low-pressure mercury lamp in this way, conventionally, as schematically shown in FIG. 6, the holding portion 1a of the low-pressure mercury lamp 1 is attached to the stainless steel cooling hollow container 100, and the low-pressure mercury lamp A cooling square pipe 101 made of stainless steel was placed near the discharge tube portion 1b, and a stainless steel pipe 102 was connected to the cooling hollow container 100 and the cooling square pipe 101 to allow cooling water to flow. In FIG. 6, the ultraviolet irradiation device is applied to a device for irradiating and cleaning the plate-like processed member 104 supported by the idle roller 103 and conveyed in a direction perpendicular to the paper surface. Illustrated. Here, the cooling hollow container 100 or the like is made of stainless steel having a low thermal conductivity so as to suppress erosion caused by ultraviolet rays emitted from the low-pressure mercury lamp or ozone generated by the ultraviolet rays, and cooling. This is to prevent the generation of rust caused by water flow. For example, if a material having a good thermal conductivity such as aluminum is used, contact with ultraviolet rays such as anodizing is prevented. Need surface treatment for.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, it is necessary to process and form a hollow container or a square pipe with stainless steel.
This invention is made | formed in view of this situation, The objective is to reduce the apparatus cost of an ultraviolet irradiation device as much as possible.
[0005]
[Means for Solving the Problems]
In the ultraviolet irradiation apparatus provided with the low pressure mercury lamp which hold | maintained the discharge tube part in the holding | maintenance part by providing the structure of the said Claim 1, the flat lamp support member arrange | positioned along the said discharge tube part the holding portion is attached to the lamp cooling means for cooling the area facing the discharge tube portion and the holding portion of the support member is provided, et al is, the cooling means, mounting of the holding portion in the lamp support member A pipe member that forms a coolant flow path so as to cool the surface opposite to the surface, and a fixing means that fixes the pipe member to the lamp support member or a member connected to the lamp support member And a gap between the pipe member and the lamp support member or a member connected to the lamp support member is filled with a heat conduction filling member. To have.
That is, not only the holding part of the low-pressure mercury lamp is attached to the lamp supporting member cooled by the cooling means to cool the holding part, but also the lamp supporting member cools the heat released from the discharge tube part. Therefore, the configuration for cooling the low-pressure mercury lamp can be simplified.
[0006]
In addition, the lamp support member, which is the direct cooling target of the cooling means, has a simple shape to reduce costs, and the direct cooling target of the cooling means is used as the lamp support member, so that adverse effects such as ultraviolet rays can be prevented. It is possible to block by the presence of, and the burden of countermeasures against ultraviolet rays on the constituent materials of the cooling means and the like is eased.
Therefore, the apparatus cost of the ultraviolet irradiation device can be reduced as much as possible.
[0007]
Further, as a cooling means for cooling the lamp support member to which the low-pressure mercury lamp is attached, from the viewpoint of simplifying the shape of the lamp support member itself as much as possible, the cooling liquid can be used rather than forming the coolant flow path in the lamp support member itself. It is more rational to fix the pipe member forming the flow path so as to cool the lamp support member, and it is not necessary to make the lamp support member resistant to the coolant. .
[0008]
However, according to the experiment of the inventor of the present invention, even if the pipe member is fixed by the fixing means, the cooling effect on the holding portion of the low-pressure mercury lamp attached to the lamp support member is not necessarily sufficient. It has been found that the cooling effect on the holding part of the low-pressure mercury lamp is drastically improved by filling the gap between the contact points with the support member side with a filling member for heat conduction.
Accordingly, a sufficient cooling effect can be obtained while the lamp support member and the cooling means are simply configured.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the ultraviolet irradiation device of the present invention is applied to an ultraviolet cleaning device will be described with reference to the drawings.
As shown in the cross-sectional view of FIG. 1, the ultraviolet cleaning apparatus includes an object transport unit TU disposed in the lower part of the apparatus and an ultraviolet irradiation apparatus UI disposed in the upper part of the apparatus.
Although not shown, the ultraviolet irradiation device UI is configured to be able to swing open and close with one end thereof as a support shaft.
[Configuration of object to be cleaned TU]
In the present embodiment, a plate material 2 such as a glass plate is illustrated as an object to be cleaned, and the plate material 2 that is moved and operated by a driving unit (not shown) in a direction perpendicular to the paper surface in FIG. The idler roller 4 supported by is supported.
[0010]
[Schematic configuration of UV irradiation device UI]
The ultraviolet irradiation device UI includes a low-pressure mercury lamp 1, a flat lamp support member 5 that attaches and supports the low-pressure mercury lamp 1, and cooling means CM that directly cools the lamp support member 5. .
The low-pressure mercury lamp 1 is a plate material 2 on which three low-pressure mercury lamps 1 are cleaned as shown in FIG. 2 showing a state in which the holding portion 1a of the low-pressure mercury lamp 1 is attached and fixed to the lamp support member 5 as viewed from the bottom. The lamp support member 5 is arranged along the discharge tube portion 1b with the surface formed by the discharge tube portion 1b of the low-pressure mercury lamp 1 and the lamp support member 5 in a parallel posture. .
The flat lamp support member 5 is formed of an aluminum plate having a good thermal conductivity, and an alumite process is applied to the surface to ensure sufficient ultraviolet resistance. This alumite processing may be performed by purchasing an already anodized aluminum plate and performing the necessary machining, or by purchasing an anodized aluminum plate and performing the necessary machining, and then applying the anodized processing. Also good. The thickness of the lamp support member 5 is set to a thickness having a sufficient strength to constitute the frame of the ultraviolet irradiation device UI.
[0011]
[Configuration of cooling means CM]
The cooling means CM is configured to cool an area facing the discharge tube portion 1b and the holding portion 1a in the lamp support member 5 as shown in FIG. 3 showing the ultraviolet irradiation device UI in plan view, and mainly holds it. It comprises a first cooling part C1 for the purpose of cooling the part 1a and a second cooling part C2 for the purpose of cooling mainly against the heat radiation of the discharge tube part 1b.
Both the first cooling unit C1 and the second cooling unit C2 cool the surface of the lamp support member 5 opposite to the mounting surface of the holding unit 1a (that is, the upper surface side of the lamp support member 5). The pipe member 6 that forms the coolant flow path and the fixing means PS that presses and fixes the pipe member 6 to the lamp support member 5 or a member that is connected to the lamp support member 5 are provided. . In the present embodiment, it is assumed that the coolant is general cooling water, and the pipe member 6 is suitable for passing cooling water, has good thermal conductivity, and is bent. Easy copper pipes are used. The shape of the pipe member 6 is a round pipe.
[0012]
As shown in FIG. 3, the pipe member 6 passes from the cooling water inlet 10 provided on the side wall of the ultraviolet irradiation device UI through the first cooling unit C1 through the second cooling unit C2, and on the side wall of the ultraviolet irradiation device UI. Although a series of flow paths to the provided cooling water outlet 11 is formed, the pipe joint 12 is provided between the first cooling part C1 and the second cooling part C2 from the viewpoint of convenience in processing the pipe member 6 and the like. It is comprised by two round pipes connected by.
The bending shape of the pipe member 6 is such that the pipe member 6 is bent on the short side of the area to be cooled that is assumed to be substantially rectangular in both the first cooling portion C1 and the second cooling portion C2. The number of times is reduced as much as possible to lower the resistance of the cooling water flow path.
[0013]
The fixing means PS presses and fixes the straight path portion of the pipe member 6. In the first cooling part C 1, the pipe member 6 is directly pressed against the lamp support member 5, whereas the lamp support member is fixed. The pipe member 6 is pressed against a member connected to the pipe 5.
The pressing structure of the pipe member 6 by the fixing means PS will be described in more detail. In the first cooling part C1, as shown in FIG. 4 showing an enlarged cross section taken along the line AA ′ in FIG. A groove 13 having a semicircular cross section is formed on the upper surface of 5 along the position where the pipe member 6 is arranged so as to conform to the shape of the pipe member 6. The fixing means PS is constituted by a first pressing member 14 having a groove 14a having a semicircular cross section so as to conform to the shape, and the first pressing member 14 is clamped to the lamp support member 5 in a state where the pipe member 6 is sandwiched. Securely screw on top of the.
When the first pressing member 14 is fixed, a gap formed slightly between the pipe member 6 and the lamp support member 5 is filled with a filling member for heat conduction.
More specifically, in the present embodiment, a heat radiating grease such as silicon grease is used as the filling member, and the heat radiating grease is used as the outer periphery of the pipe member 6, the lower surface of the first pressing member 14, and the lamp support. The first pressing member 14 is screwed to the lamp support member 5 after being thinly applied to the contact portion of the member 5 with the first pressing member 14 and the pipe member 6.
[0014]
On the other hand, in the second cooling section C2, as shown in FIG. 5 showing an enlarged cross-sectional view taken along the line BB ′ of FIG. The pipe receiving member 15 formed with a semicircular groove 15a is arranged on the upper surface of the lamp support member 5 along the arrangement position of the pipe member 6, and the shape of the pipe member 6 is formed on the lower surface of a square member made of, for example, aluminum. The fixing means PS is configured by the second pressing member 16 having a groove 16a having a semicircular cross section so as to fit, and the pipe member 6 and the pipe receiving member 15 that supports the pipe member 6 are sandwiched. 2 The pressing member 16 is firmly screwed to the upper surface of the lamp support member 5.
When the second pressing member 16 is fixed, a filling member for heat conduction is provided in the gap generated slightly between the pipe member 6 and the pipe receiving member 15 and between the pipe receiving member 15 and the lamp support member 5. Filled.
[0015]
More specifically, in the present embodiment, as in the first cooling unit C1, heat dissipating grease such as silicon grease is used as the filling member, and the outer periphery of the pipe member 6 and the lower surface of the second pressing member 16 are used. The second pressing member 16 is screwed to the lamp support member 5 after being thinly applied to the upper and lower surfaces of the pipe support member 15 and the portion of the lamp support member 5 that contacts the pipe support member 15.
Thus, in the second cooling unit C2, the pipe member 6 is not directly pressed against the upper surface of the lamp support member 5, but is connected to the pipe receiving member 15 which is a member provided continuously to the lamp support member 5. It is easier to form the straight groove 15a in the square member than to form the groove 13 along the arrangement shape of the pipe member 6 on the surface of the lamp support member 5 having a large area. In addition, in the first cooling part C1, it is desirable to reduce the thermal resistance between the pipe member 6 and the holding part 1a as much as possible in order to strongly cool the holding part 1a of the low-pressure mercury lamp 1. On the other hand, the second cooling unit C2 comprehensively considers that the cooling capacity as high as that of the first cooling unit C1 is not required.
[0016]
Next, the cooling capacity of the cooling means CM configured as described above will be described.
In the above configuration, when the flow rate of the cooling water at 20 ° C. is set to 6.5 L / min and the low-pressure mercury lamp 1 with a rated power of 1.3 kW is used, the temperature in the vicinity of the holding portion 1a of the low-pressure mercury lamp 1 is 30 minutes after starting lighting, 30.8 ° C. and 60 minutes after starting lighting, both 30.8 ° C. showed good values, and the low-pressure mercury lamp 1 operated stably at almost the rated output (electric power).
On the other hand, in the above configuration, when the cooling means CM is configured without applying the heat-dissipating grease, the temperature near the holding portion 1a of the low-pressure mercury lamp 1 is 30 minutes after the start of lighting under the same experimental conditions as described above. Even at 60 minutes after starting lighting at 38.2 ° C., the value was as high as 37.6 ° C., and the low-pressure mercury lamp 1 did not reach the rated output (power).
For reference, in the configuration of the cooling means CM, the low pressure mercury lamp 1 is held in the stainless steel cooling hollow container 100 (thickness is less than 2 mm) described in the prior art for the configuration of the first cooling section C1. As a result of an experiment when the part 1a is replaced, the temperature in the vicinity of the holding part 1a of the low-pressure mercury lamp 1 is 32.8 ° C. 30 minutes after the start of lighting, and 32.4 ° C. even 60 minutes after the start of lighting. The cooling capacity was lower than that of the cooling means CM to which the present invention was applied, and the high cooling capacity of the cooling means CM of the present invention was confirmed.
As described above, the gap is made into heat-dissipating grease while reducing the cost of the apparatus with a simple configuration in which the copper pipe serving as the flow path of the cooling water is pressed against the anodized aluminum plate or a member connected thereto. Thus, it is possible to provide an ultraviolet irradiation device UI that can improve the cooling effect on the low-pressure mercury lamp 1 rather than the conventional configuration.
[0017]
Next, a configuration for supplying cooling water to the cooling means CM will be described.
As a cooling water supply source, for example, a cooling water supply facility in a factory is used. As shown in FIG. 3, after adjusting the flow rate of the cooling water supplied from the cooling water supply facility with a flow meter 20, cooling means The cooling water flowing into the CM cooling water inlet 10 and flowing out of the cooling water outlet 11 through the first cooling section C1 and the second cooling section C2 circulates to the cooling water supply facility.
In this cooling water flow path, a relay pipe 21 made of a resin pipe such as Teflon (R) is connected to the cooling water inlet 10 and the cooling water outlet 11, and a supply side pipe 22 made of a stainless steel pipe is further connected to the relay pipe 21. Is connected.
[0018]
As described above, the stainless steel pipe is not directly connected to the cooling water inlet 10 and the cooling water outlet 11 when the copper pipe on the cooling means CM side and the stainless steel pipe on the cooling water supply side are brought into contact with each other. This is because so-called electric contact occurs.
From this point of view, the pipe joint 12 in the pipe of the pipe member 6 and the joints of the cooling water inlet 10 and the cooling water outlet 11 are all made of brass, and the pipe joint connecting the relay pipe 21 and the supply side pipe 22. 23 is made of stainless steel.
Furthermore, the length of the resin pipe of the relay pipe 21 is desirably 1 mm or more and 3000 mm or less, and the electrical conductivity of the cooling water is desirably 1 μS / cm or more.
[0019]
[Another embodiment]
Hereinafter, other embodiments of the present invention will be listed.
(1) In the above embodiment, the case where the holding portion 1a of the low-pressure mercury lamp 1 is directly attached and fixed to the flat lamp support member 5 is illustrated, but a spacer is used as a part of the lamp support member 5. It may be configured so that the holding portion 1a is attached via the spacer.
[0020]
(2) In the above embodiment, the pipe receiving member 15 that presses the pipe member 6 directly against the lamp support member 5 in the first cooling section C1 and the pipe member 6 is connected to the lamp support member 5 in the second cooling section C2. However, the pipe member 6 may be directly pressed against the lamp support member 5 in both the first cooling part C1 and the second cooling part C2, or the first cooling part You may comprise so that the pipe member 6 may be pressed on the member connected with the lamp support member 5 in both C1 and the 2nd cooling part C2.
[0021]
(3) In the above embodiment, the case where the cleaning apparatus is equipped with the ultraviolet irradiation device of the present invention is illustrated, but it can be applied to various uses such as a sterilization apparatus.
(4) In the above embodiment, the heat dissipating grease is exemplified as the heat conducting filling member, but various filling members such as epoxy resin (selecting one having as high thermal conductivity as possible) and a heat dissipating silicon sheet are used. Can be used.
[0022]
【The invention's effect】
According to the configuration of the first aspect, not only the holding part of the low-pressure mercury lamp is attached to the lamp supporting member cooled by the cooling means to cool the holding part but also the lamp supporting member is discharged from the discharge tube part. Since it also cools the generated heat, the configuration for cooling the low-pressure mercury lamp can be simplified.
In addition, the lamp support member, which is the direct cooling target of the cooling means, has a simple shape to reduce costs, and the direct cooling target of the cooling means is used as the lamp support member, so that adverse effects such as ultraviolet rays can be prevented. Therefore, the burden on the cooling means against ultraviolet rays can be reduced.
Therefore, the apparatus cost of the ultraviolet irradiation device can be reduced as much as possible.
[0023]
Further, in the case of simplifying the configuration in which the pipe member forming the coolant flow path is fixed to the lamp support member so as to cool, the lamp member can be fixed even if the pipe member is fixed by the fixing means. The cooling effect on the holding part of the low-pressure mercury lamp attached to the support member is not always sufficient. By filling the gap between the contact points between the pipe member and the lamp support member side with a heat conduction filling member, Based on the knowledge that the cooling effect on the holding part is drastically improved, by configuring the ultraviolet irradiation device using the filling member, a sufficient cooling effect can be achieved while the lamp support member and the cooling means are simply configured. Was obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an ultraviolet irradiation device according to an embodiment of the present invention. FIG. 2 is a bottom view of the ultraviolet irradiation device according to an embodiment of the present invention. FIG. 4 is an enlarged view of a main part according to an embodiment of the present invention. FIG. 5 is an enlarged view of a main part according to an embodiment of the present invention. Explanation of]
DESCRIPTION OF SYMBOLS 1 Low pressure mercury lamp 1a Holding part 1b Discharge tube part 5 Lamp support member 6 Pipe member CM Cooling means PS Fixing means

Claims (1)

An ultraviolet irradiation device equipped with a low-pressure mercury lamp that holds a discharge tube part in a holding part,
The holding part is attached to a flat lamp support member arranged along the discharge tube part,
The lamp cooling means for cooling the area facing the discharge tube portion and said holding portion of the support member is provided, et al is,
The cooling means includes a pipe member that forms a flow path for cooling liquid so as to cool the surface of the lamp support member opposite to the mounting surface of the holding portion, and the lamp support member or the lamp support. A fixing means for fixing the pipe member to a member connected to the member; and
An ultraviolet irradiation device configured such that a gap between the pipe member and the lamp support member or a member connected to the lamp support member is filled with a heat conduction filling member .

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