JPS61175491A - Spacer for heat transfer tube - Google Patents

Abstract

PURPOSE:To make it possible to assemble heat transfer tubes individually with no relation with other by making the planar shape of a spacer hexagonal or quadri- lateral and dividing the periphery in two and forming on each a projection and a U-shaped groove. CONSTITUTION:The three sides in succession of a spacer 18 has on each of those three sides a projection 9 with a step betwen the upper and lower faces of the spacer 8. The planar shape of the projection 9 has edges made by extensions of the adjacent sides to form a trapezoid. The height H of a U-shaped groove 10 is a little larger than the width of the projection 9 to facilitate insertion of the projection 9 into the U-shaped groove 10. The hole 11 into which a heat transfer tube 3 is inserted has outer diameter larger than that of the tube 3, and the heat transfer medium flows through the fluid flow hole 2. Within a circular shell 1 many heat transfer tubes are assembled by arranging them criss-crossed to others. In the assembly firstly the central heat transfer tube (a) is welded on to the tube plate and thereafter spacers 8 are successively laid in the order of (b), (c), (d), and so on with the projections 9 and U-shaped grooves 10 fitted together.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spacer for heat exchanger tubes that facilitates assembly of heat exchanger tubes.

[Prior Art] As shown in FIG. 6, a heat exchanger has a tube plate 2 provided at the upper and lower ends of a shell 1, and supports a large number of heat transfer tubes 3 on the tube plate 2.

These heat exchanger tubes 3 are arranged in a staggered or base shape, and are held aligned by spacers 4 so that the arrangement is not disturbed.

In addition, the tube plate 2 and the heat exchanger tube 3 are joined by W as shown in FIG.
Butt welded in sections. In particular, for high-temperature, high-pressure heat exchangers such as those used in nuclear power plants, the welds mentioned above are rigorously inspected, and if a weld is found to be defective, the heat exchanger tube is removed, the weld groove is reprocessed, and the weld is reworked. Perform welding.

The conventional spacer 4 is made of a plate or square material as shown in Fig. 8, processed to match the outer diameter and arrangement pitch of the heat exchanger tubes 3 (staggered arrangement in this case), and inserted between the rows of heat exchanger tubes. was. Note that 6 is a fluid flow hole.

[Problems to be Solved by the Invention] By the way, in the conventional spacer 4 described above, when assembling the heat transfer tubes 3 to the tube plate 2 while welding, if one of the tube rows has a welding defect, the entire tube row could not be assembled, heat transfer tube 3
The disadvantage was that it took a long time to assemble. Furthermore, since the spacers 4 are fastened one by one to the shell 1 with bolts 7, there is a drawback that it takes a lot of time to tighten the bolts 7.

Therefore, the present invention aims to provide a spacer for a heat exchanger tube that allows the assembly of the heat exchanger tube alone, regardless of other heat exchanger tubes.

[Means for Solving the Problems 1] One of the spacers for heat exchanger tubes of the present invention which solves the above problems is one in which small spacers are combined, and the planar shape of the spacers is hexagonal. , a protrusion with a step between the top and bottom surfaces of the spacer is formed on the side surfaces of the three sides of this hexagonal surface, and the planar shape of the protrusion is made into a trapezoidal shape with the extension line of the adjacent sides as the ridgeline, and U-shaped grooves with dimensions that allow the projections to fit are formed on three sides of the spacer, and a hole for inserting the heat exchanger tube is provided in the center of the plane of the spacer.

Another heat exchanger tube spacer of the present invention has a quadrangular shape instead of the hexagonal shape described above, and has protrusions on two side surfaces and protrusions on the other two side surfaces, similar to the above spacer. It is characterized by the formation of a U-shaped groove.

[Function] In this way, by using small spacers and assembling them by fitting them into each heat exchanger tube one by one, the heat exchanger tubes can be assembled independently.

[Example] An embodiment of the present invention will be described in detail below.

FIG. 1 shows a spacer 8 having a hexagonal planar shape. Reference numeral 9 denotes a protrusion having a step between the upper and lower surfaces of the spacer 8 on the side surfaces of three consecutive sides of the spacer 8, and the planar shape of the protrusion 9 on each side is similar to that of the adjacent side, as shown in FIG. It is a trapezoid with the ridge line being the extension of the side. Again 1
0 is a U-shaped groove formed on the other three side surfaces of the spacer 8. The height H of this U-shaped groove 10 is slightly larger than the thickness t of the protrusion 9, so that the protrusion 9 fits into the U-shaped groove 10. 11
is a heat exchanger tube insertion hole provided at the center of the plane of the spacer 8. This insertion hole 11 is inserted into the heat exchanger tube 3 as shown in FIG.
is larger than the outer diameter of Reference numeral 12 denotes a communication hole through which a heat medium flows. The spacer 8' in FIG. 2 has a rectangular planar shape, and the protrusion 9' and the U-shaped groove 10' are
Each side is divided into two sides. 11 is a heat exchanger tube insertion hole provided at the center of the plane of the spacer 8';
2' is a communication hole through which a heat medium flows.

Next, the operation of this embodiment configured as described above will be explained. As shown in FIG. 4, the required number of spacers 8 are fitted into the heat exchanger tubes 3. For example, for the heat exchanger shown in Figure 6, 2
1 to 22 pieces are inserted.

With the heat transfer tube 3 fitted into the heat transfer tube 3 as described above, move the heat transfer tube 3 in the direction of the arrow in FIG. 4 to fit the projection 9 of the spacer 8 into the U-shaped groove 10, and then Tube plate 2 as shown in
and the heat exchanger tube 3 are welded together.

For example, as shown in FIG. 5, when a large number of heat exchanger tubes 3 are assembled in a staggered arrangement in a circular shell 1 like a heat exchanger for nuclear power, as an example of such assembly, first Heat exchanger tube A is welded to tube plate 2. Next, as shown in FIG. 4, the heat exchanger tube opening is fitted with a spacer 8 and welded to the tube plate 2.

Thereafter, the spacers 8 are fitted one after another in the same manner, and the assembly is continued in steps C and 2. The welding with the tube sheet 2 is strictly inspected each time, and if the welding is defective, the heat exchanger tube 3
Remove the chisel, prepare a bevel and re-weld.

In this way, the heat exchanger tubes 3 are independently welded to the tube sheet, and finally fixed to the shell 1 with the hoop material 13. 7
are bolts and nuts for fixing the hoop material 13.

The thus assembled spacer 8 is held in a single plate shape by fitting the projection 9 and the U-shaped groove 10. If necessary, a tie rod may be welded to pass through the spacer 8 to support the assembled plate-shaped spacer 8.

Moreover, in FIG. 3, when the flow holes 12 are not provided, it is also possible to use it as a baffle plate of a heat exchanger.

[Effects of the Invention] As detailed above, the spacer for heat exchanger tubes of the present invention is divided into small pieces, the planar shape of the spacer is made into a hexagonal or quadrangular shape, and the periphery of the spacer is divided into two parts, each having a protrusion and a U-shape. In the case of a hexagonal spacer, the planar shape of the protrusion is a trapezoid with the extension line of the hexagonal side as the ridgeline, or
Since the square shape is a rectangle with the extension line of the side as the side, each heat transfer tube must be assembled independently by fitting the protrusion of each spacer into the U-shaped groove. is possible,
The heat exchanger can be easily assembled. In addition, the planar shape of the spacer is hexagonal or quadrangular, and each
Since each spacer has the same shape and can be manufactured in large quantities with highly accurate dimensions, the assembled spacer can accurately form the pitch of the tube arrangement, and the heat exchanger tubes can be held at an accurate pitch. It has excellent effects such as improved performance.

[Brief explanation of drawings]

1 to 3 show examples of the present invention, in which FIG. 1 is a perspective view of a spacer with a hexagonal planar shape, FIG. 2 is a perspective view of a spacer with a quadrangular planar shape, and FIG. Figure 3 is a plan view showing how to assemble a spacer with a hexagonal plan view, Figure 4 is a vertical sectional view showing the assembled state of the spacer and heat transfer tubes, and Figure 5 is a plan view of a heat exchanger with a hexagonal plan view. A partial plan view showing the assembled state of the spacer, Fig. 6 is a longitudinal cross-sectional view showing an example of a heat exchanger, Fig. 7 is a longitudinal cross-sectional view showing the welded part between the tube plate and the heat transfer tube, and Fig. 8 is a conventional FIG. 2 is a partial plan view showing a state in which a heat exchanger tube is assembled using spacers. 8.8'...Spacer 9,9'...Protrusion 10
．． 10'... U-shaped groove 11... Hole for heat exchanger tube insertion 12.12'... For general distribution purposes Person Kawasaki Heavy Industries, Ltd. Figure 1 Figure 2 Figure 3m Figure 4 Δ Figure 5 Figure 2

Claims (2)

[Claims] (1) The planar shape of the spacer is hexagonal, and a protrusion with a step between the top and bottom surfaces of the spacer is formed on the side surfaces of three consecutive sides of the hexagon, and the planar shape of the protrusion is an extension of the adjacent sides. For heat exchanger tubes, the spacer has a trapezoidal shape with lines as ridgelines, U-shaped grooves into which the projections fit are formed on the other three sides, and a hole through which the heat exchanger tube is inserted is provided in the center of the plane of the spacer. Spacer. (2) The planar shape of the spacer is a quadrilateral, and a protrusion with a step between the upper and lower surfaces of the spacer is formed on the side surfaces of the two sides that the quadrilateral passes through, and the planar shape of the protrusion is changed to that of the adjacent sides. The spacer has a rectangular shape with the extension line as the side, a U-shaped groove into which the projection fits is formed on the other two sides, and a hole through which the heat transfer tube is inserted is provided in the center of the plane of the spacer. Spacer for heat exchanger tubes.