JPH0348840Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultraviolet lamp used in a water-cooled ultraviolet irradiation device by being inserted and supported within a double-tube type water-cooled jacket.

In the printing and painting fields, when printing or applying ultraviolet curable ink or paint onto paper, plastic, etc. and curing it by irradiating it with ultraviolet rays, the paper or plastic may deform or shrink due to the heat rays from the ultraviolet lamp. This may cause other abnormalities. To prevent this, if you insert an ultraviolet lamp into the double-tube water cooling jacket and turn it on, the heat generated by the ultraviolet lamp can be effectively removed by the cooling water flowing inside the water cooling jacket.
Ultraviolet curing inks and paints can be used even on materials with poor heat resistance such as paper and plastics, expanding the range of uses for this type of photosensitive material.

FIGS. 3 and 4 show an example of a conventional device of this type. In the figure, reference numeral 1 denotes a water cooling jacket made of a cylindrical tube with a double wall structure made of quartz (hereinafter referred to as a double pipe type water cooling jacket), and an inlet 2a and an outlet 2b for cooling water are provided at both ends. Cooling water is allowed to flow between the double wall surfaces. Reference numeral 3 designates an ultraviolet lamp, and a cap 4 having a collar 4a is attached to both ends of the lamp.By inscribing the collar 4a of the cap 4 into the inner wall of the water-cooling jacket 1, the UV lamp 3 can be placed in the center of the water-cooling jacket. Supported and fixed. A lead wire 5 supplies power to the lamp, and is drawn out from the rear of the base 4.

In this device, the closer the ultraviolet lamp 3 is to the inner wall of the water cooling jacket 1, the greater the cooling effect, but as the lamp output increases and the length of the lamp increases, the heat generated by the lamp and its own weight will cause
It may curve downward at the center of the lamp. When the lamp bends and comes into contact with the inner wall of the water-cooling jacket 2, the contact area is locally cooled, and mercury and other inclusions condense in that area, making it impossible to maintain the normal lighting condition and reducing the lamp output. , or disappear.

The present invention provides a water-cooled ultraviolet lamp in which one or more protrusions are provided approximately at the longitudinal center of the lamp to prevent the lamp from curving and to stably light the lamp.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, reference numeral 1 denotes a double-pipe water cooling jacket made of quartz, and an inlet 2a and an outlet 2b for cooling water are provided at both ends thereof. 3 is an ultraviolet lamp, and a cap 4 with a flange 4a is attached to the end of the lamp. 5 is a lead wire that supplies power to the lamp.
It is pulled out from the rear of the cap 4. Reference numeral 6 denotes a protrusion made of the same material as the outer tube of the lamp for contact prevention, and is provided on the outer periphery of the central portion of the ultraviolet lamp 3 in the longitudinal direction. Incidentally, since the ultraviolet lamp 3 is curved downward, if only one protrusion is provided, when the ultraviolet lamp is inserted into the water cooling jacket 1, it must be inserted so that the protrusion 6 faces downward. Further, the height of the protrusion 6 is made slightly lower than the collar 4a of the cap 4 to facilitate insertion. Further, the number of protrusions 6 is desirably about two or three, taking into account misalignment when the ultraviolet lamp 3 is attached to the water cooling jacket 1. In addition, although the hemispherical protrusion was formed in the above embodiment, the protrusion was formed parallel to the tube axis direction of the lamp outer tube.
Alternatively, the same effect can be obtained by providing a rib-like projection to surround the lamp outer tube.

According to this invention, even if the ultraviolet lamp were to bend, the tip of the protrusion formed on the lamp's outer bulb would simply contact the inner surface of the water cooling jacket, preventing local cooling and continuing stable lighting. can. Therefore, it is possible to prevent problems such as a decrease in the lamp output or the lamp going out while the lamp is on, and it is also possible to prevent the uncured UV-curable ink or paint applied to paper or plastic from flowing away and producing defective products. , its practical effects are great.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the device of the present invention;
Figure 2 is a sectional view taken along the line A-A in Figure 1, Figure 3 is a sectional view showing an example of a conventional device of this type, and Figure 4 is a sectional view taken along the line B-B in Figure 2. be. 1...water cooling jacket, 3...ultraviolet lamp,
4...cap, 6...protrusion.

Claims (1)

[Scope of utility model registration request] In an ultraviolet lamp that is used by being inserted and supported in a cylindrical water-cooled jacket through a cap having a flange having an outer diameter approximately equal to the inner diameter of the water-cooled jacket, the above-mentioned tip tube is provided in the center of the lamp in addition to the exhaust tip tube. An ultraviolet lamp characterized in that one or more hollow or non-hollow protrusions are provided so as not to change the discharge space of the ultraviolet lamp, which is slightly lower than the height of the flange of the base.