JPS6044942A - Method of connecting quartz tube for discharge lamp - Google Patents

Abstract

PURPOSE:To achieve the vacuum airtightness of the joint area between an emission tube consisting of a quartz tube and an exhaustion branch tube consisting of a quartz tube by expanding its connection end into a trumpet-like form, the fusing the end of the branch tube around the exhaust hole of the emission tube. CONSTITUTION:A combustion gas fed from a combustion gas supply tube 5, while passing through the nozzle hole of a burner 4, burns in a jet flame 6. When the end of an exhaust branch tube 2 consisting of a quartz tube is heated by the jet flame 6, the end and the inner surface of the branch tube 2 are gradually softened by being heated by the jet flame 6 thereby being formed into a trumpet-like shape 7. Next, after the trumpet-like end of the branch tube 2 is placed facing an exhaust hole 1a which is formed in an emission tube 1 consisting of a quartz tube, they are fused after being heated with an annular burner 3 to a given temperature. By the means mentioned above, the emission tube 1 and the branch tube 2 can be connected while maintaining the vacuum airtightness of the joint area without causing any decrease of the inner diameter of the branch tube 2.

Description

[Detailed Description of the Invention] For example, a hl &
It is related to.

Generally, a quartz tube is used for the arc tube and exhaust branch θ of a HID lamp, and as shown in FIG. The electrodes are sealed at both ends and sent to the exhaust process.

Then, in the second stage of exhaustion, the arc tube 1 is evacuated with a vacuum pump through all the branch pipes.1. Thereafter, in addition to mercury in a mercury or metal halide lamp, a metal sheet piece of metal halide, scandium, etc. is sealed into the light emitting uI through the branch pipe 2. For this reason, during the exhaust process, the connection part A between the arc tube l and the branch pipe 2 must be kept vacuum-tight, and the branch pipe It is necessary that the hole is equal to or larger than the inner diameter of 2.

Fig. 1 shows a conventional connection method. In Fig. 1(a), a ring-shaped burner nozzle 3a is inserted into the annular burner 3. For example, a mixed gas of city gas and , the connection hole 1a formed in the arc tube 1 and the branch tube 2 cut off! iia 1ll ('f: fc which is uniformly heated to a temperature that can be welded). By the way, connect as shown in (b). In this way, the heated part of the end of the Q branch pipe 2 is ( c) As shown in the previous tjM force 11A
Since the outer diameter and inner diameter of section A are oriented to contract, there are many cases where the outer diameter and inner diameter of section A do not coincide with the hole 1a of the arc tube 1, and therefore, the vacuum tightness tends to occur at the connection section A. Moreover, since the inner diameter of the branch pipe 2 is reduced at the connection part A, there is a drawback that it has a negative effect on the pumping speed and the Jm of the enclosed material.

This invention was made in order to eliminate the drawbacks of the conventional ones as described in d and -.The end of the exhaust branch pipe is enlarged in diameter into a trumpet shape, and this end is connected to the exhaust hole of the arc tube. By welding and connecting to the joint, the vacuum seal of the joint is ensured, and the inner diameter of the branch pipe is also reduced, so the stone casing for discharge lamps is stiff so that exhaust and the passage of the enclosed material can be carried out without any hindrance. The purpose is to provide a connection method.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows a burner that expands the diameter of the end of the branch pipe 2 and heats it into a trumpet shape. 4 is the burner main body, and 5 is a combustion gas supply pipe. The burner body 4 has a nozzle hole 4a with a diameter d,
The combustion gas ejected from this nozzle hole becomes an ejected bundle 6 and burns. When the end of the branch pipe 2 is brought close to the jet bundle 6 and heated by this heater as shown in FIG. 5, the end and inner surface of the branch pipe are pressurized by the jet bundle and gradually soften.
．． As a result, the end of the branch pipe 2 is processed into a trumpet-shaped portion 7 as shown in FIG. In the processing method described above, since the thermal power and ejection force of the burner jet bundle 6 are used, the gap H between the end of the branch pipe 2 and the burner 4 is set as the inner diameter of the branch pipe 2.
It is preferable that D=0.5d-d and H=1.0d to 5d. d is the nozzle hole diameter of the burner. In FIG. 6, reference numeral 8 denotes a water-cooled vibrator for water-cooling the burner body 4, which is a steel pipe silver-brazed to the burner body.

The branch pipe 2, whose end has been processed into a trumpet shape, is connected to the second pipe.
As shown in the figure, an exhaust hole 1 is pre-formed in the arc tube 1.
Place the trumpet-shaped ends facing a and heat them using the annular nozzle □-3. When the temperature reaches a welding temperature, weld them together, and the light emitted from the branch pipe 2 shown in Figure 2 will be produced. Pipes can be manufactured.

As described above, according to the present invention, the end of the exhaust branch pipe is expanded into a trumpet shape and welded to the exhaust hole of the arc tube, thereby making it possible to connect the arc tube and the branch pipe. Since the connecting portion is kept vacuum-tight and the inner diameter of the branch pipe at the connecting portion is not reduced, it is possible to smoothly evacuate the arc tube or insert materials into the arc tube without any trouble.

[Brief explanation of the drawing]

Figure 1 shows the conventional connection method; (a) shows the heating state, (b) shows the contact between the arc tube and the branch pipe, and (c)
2 is a perspective view of the arc tube and the branch pipe connected according to the present invention, FIG. 3 is a diagram showing the heated state, FIG. 4 is a sectional view of the burner, and FIG. Figure Q-1 shows the heating state of the branch pipe, and Figure 6 shows the branch pipe expanded in diameter in a trumpet shape. ■... Arc tube, 1a... Exhaust hole, 2... Branch pipe,
3... Annular burner, 4... Burner, 7... Trumpet-shaped part. In addition, in the drawings, the direction number indicates the same or equivalent part 0 Agent Masuo Oiwa Figure 1 (C1) Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Procedural amendment (voluntary) '4 ;l, H1=,! , Mr. Director-General 1 °j [A'1 front box ↑, 1. Lighting 58-151
255 No. 2 Zatoaki's name: Method for connecting quartz tubes for indicator discharge lamps; 3. Detail of the invention in the amended description of the invention 6. Contents of amendment il+ Specification page 1, lines 14-15 “Branch pipe J’ff:r
σ for the branch pipe” and amend it. (21, 2nd line, 13th r (b) Correct J to “(b) figure”. (3) Same page, 15th line, r (c) Correct J to “(C) figure”. (4) Same page Correct “Figure 2” to “Figure 3” on page 4, line 90

Claims (1)

[Claims] A quartz tube is also used for discharge lamp arc tubes made of stone-filled tubes, f:
! J) Method of connecting F air branch pipes ν (place, v
The connecting end of the air branch pipe was enlarged in diameter into a trumpet shape, and this branch bone end 15 was welded and connected to the exhaust hole of the arc tube 4: Patented quartz tube connection for discharge lamp Method.