JPH0112954Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a guide jig for a finned heat exchanger tube used when assembling the finned heat exchanger tube to a heat exchanger.

[Technical background of the invention and its problems] For example, in a combined cycle power plant, a finned heat exchanger tube having a large number of fins on the outer periphery is used as a heat exchanger tube of an exhaust heat recovery heat exchanger.

Such finned heat exchanger tubes are sequentially inserted from their tips into tube holes bored in support plates arranged at regular intervals in the exhaust heat recovery heat exchanger.

Figure 4 shows a guide jig for finned heat exchanger tubes used when inserting finned heat exchanger tubes into pipe holes drilled in such support plates. , a tapered part 1 is formed at the tip and an insertion hole 3 is bored at the rear end into which the tip of the finned heat exchanger tube 2 is inserted, and as shown in FIG. It is used as a guide when inserting into the pipe hole 5 drilled in the pipe.

However, in such a conventional guide jig for a finned heat exchanger tube, the finned heat exchanger tube 2 is
Since the fins 6 are wound around the bare tube 7, which is relatively thin in relation to the outer diameter, the tube bends due to its own weight, as shown in FIG. There is a problem in that it bends more than the diameter of the hole 5 and cannot function as a guide jig.

Therefore, in the past, the finned heat exchanger tube 2 was manually lifted upward near the support plate 4 to open the tube hole 5.
It was necessary to insert the tip of the guide jig into the hole, which caused the problem of very poor workability.

On the other hand, once the finned heat exchanger tube 2 is inserted into the support plate 4, it becomes a shape in which both ends are continuously supported, and even with a relatively wide span of the support plate 4, the finned heat exchanger tube 2
Support plate 4
It is desirable to reduce the number of support plates and widen the four spans of the support plates.

[Purpose of the invention] The present invention was made in response to the above-mentioned conventional circumstances, and it is possible to smoothly and continuously insert finned heat exchanger tubes without requiring human labor even when the span spacing of support plates is wide. The present invention aims to provide a guide jig for heat exchanger tubes with fins that can be used.

[Summary of the invention] In other words, the invention consists of a first guide rod having a first tapered portion at its tip and having a smaller diameter than a pipe hole drilled in a support plate arranged at regular intervals; A second guide rod having a second tapered portion at its tip following the rear end of the first guide rod and having approximately the same diameter as the tube hole is connected on the same axis, and the first guide rod The total length of the rod is smaller than the dimension obtained by subtracting the length of the second tapered part from the dimension between the opposing sides of the support plate, and the tip of the finned heat exchanger tube is inserted into the rear end of the second guide rod. This is a guide jig for a heat exchanger tube with fins, which is characterized by having an insertion hole formed therein.

[Embodiment of the invention] The details of the invention will be described below with reference to an embodiment shown in the drawings.

Fig. 1 shows a guide jig for a finned heat exchanger tube according to an embodiment of the present invention. A first guide rod having a smaller diameter than the tube hole 5 bored in the plate 4 is shown.

The first guide rod 8 has the inner wall removed as much as possible to reduce its weight, and is formed of a thin-walled tube made of aluminum or synthetic resin, for example. At the rear end of this first guide rod 8, there is a second guide rod at the tip.
A second guide rod 11 having a slightly smaller diameter than the tube hole 5 is connected thereto. The first guide rod 8 and the second guide rod 11 are arranged on the same axis. The total length of the first guide rod 8 is slightly shorter than the dimension obtained by subtracting the length of the second tapered part 10 from the dimension between the opposing side surfaces of the support plate 4. Furthermore, an insertion hole 12 into which the tip of the finned heat exchanger tube 2 is inserted is formed at the rear end of the second guide rod 11 .

Furthermore, both side surfaces of the second guide rod 11 are chamfered 14 to prevent interference with the U-shaped vent pipe 13, as shown in FIG. Note that the outer diameter of the second guide rod 11 is desirably slightly larger than the outer diameter of the fins in order to prevent damage when the finned heat exchanger tube 2 is inserted into the tube hole 5.

The guide jig for the finned heat exchanger tube constructed as described above is used in the following manner.

That is, first, as shown in Figure 3a, the second
The tip of the bare tube 7 of the finned heat exchanger tube 2 is inserted into the insertion hole 12 formed at the rear end of the guide rod 11 , and the first guide rod 8 is inserted through the tube hole 5 of the support plate 4 . When the first guide rod 8 is completely inserted into the first support plate 4, the tip of the first guide rod 8 is located approximately 300 mm in front of the second support plate 4. In this state, since the first tapered part 9 and the first guide rod 8 are lightweight, the amount of deflection at the tip of the first tapered part 9 is very small, and the distance A from the central axis of the tube hole 5 is located on separate axes.

Furthermore, the guide jig for the finned heat exchanger tube is inserted, and the second tapered portion 10 is inserted into the first support plate 4.
When inserted into the tube hole 5, the center of the first tapered part 9 gradually approaches the central axis of the tube hole 5, as shown in FIG. The tip of the tapered part 9 is connected to the pipe hole 5 of the second support plate 4.
located in front of. At this time, the center of the first tapered part 9 is offset from the axis of the tube hole 5 by, for example, about 7 mm, which is a minute amount of deflection, so the tip of the first taper part 9 easily fits into the tube hole 5. It is ready to be inserted into.

Therefore, by further inserting a guide jig for the finned heat exchanger tube, the first tapered portion 9 can be smoothly inserted into the tube hole 5, as shown in FIG. 3c.

By sequentially inserting the guide jig for the finned heat exchanger tubes into the tube holes 5 of the support plate 4 in this manner, the finned heat exchanger tubes 2 can be easily inserted into the tube holes 5 bored in the support plate 4. I can do it.

[Effects of the invention] As described above, according to the guide jig for a heat exchanger tube with fins of the present invention, the first guide rod and the second guide rod are connected and arranged on the same axis, and the tube hole is The tip of the first guide rod is guided to the pipe hole to be inserted next by the second guide rod inserted into the pipe, so that the fins can be attached to the pipe holes of the support plates arranged at regular intervals. Heat exchanger tubes can be inserted easily.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the guide jig for a finned heat exchanger tube of the present invention, Fig. 2 is a view taken in the direction of Fig. 1, and Fig. 3 a, b, and c are the same as Fig. 1. FIG. 4 is a vertical cross-sectional view showing a conventional guide jig for a heat exchanger tube with fins, and FIG. It is an explanatory view explaining the bending of the guide jig of a heat tube. 2... Heat exchanger tube with fins, 4... Support plate, 5...
Pipe hole, 8...first guide rod, 9...first tapered part, 10...second tapered part, 11...second
guide rod.

Claims (1)

[Claims for Utility Model Registration] (1) A first guide rod having a first tapered portion at its tip and having a smaller diameter than a pipe hole bored in a support plate arranged at regular intervals; A second guide rod having a second tapered portion at the tip following the rear end of the first guide rod and having approximately the same diameter as the tube hole is connected on the same axis, and the first guide rod is connected on the same axis. The total length of the guide rod is smaller than the dimension obtained by subtracting the length of the second tapered part from the dimension between the opposing side surfaces of the support plate, and the tip of the finned heat exchanger tube is attached to the rear end of the second guide rod. A guide jig for a heat exchanger tube with fins, characterized in that an insertion hole for insertion is formed. (2) A guide jig for a finned heat exchanger tube according to claim 1, wherein the first guide rod is a thin-walled tube.