JP2504926Y2 - Heat exchanger tube support structure for heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a support structure for a helical coil heat transfer tube used in a heat exchanger such as a high temperature gas furnace.

"Prior art" As a heat exchanger for high temperature gas reactors, fast breeder reactors, etc., a plurality of helical coil heat transfer tubes with different spiral diameters are concentrically arranged outside a vertical center pipe provided in the center of the body There is a configuration. In this case, it is necessary to constrain the movement of each helical coil heat transfer tube against its own weight or external force during an earthquake, etc., to keep the mutual intervals constant.

Therefore, conventionally, for example, as shown in FIG. 5, a support member 2 called a ladder in a spiral shape along the length direction of the spiral is provided inside and outside the spiral of each helical coil heat transfer tube 1. Plural pairs are arranged at intervals in the circumferential direction,
A support structure in which the helical coil heat transfer tubes 1 are held by these support members 2, while support beams 4 are radially arranged on the outer surface of the center pipe 3, and the end portions of the support members 2 are fixed to these support beams 4. It is said that.

[Problems to be Solved by the Invention] However, since each helical coil heat transfer tube 1 is only supported by the center pipe 3 at the end of the support member 2, the above-mentioned support is caused by the gap formed between them. At a position apart from the beam 4, vibration may occur at the time of an earthquake and the like, and the seismic resistance may be reduced.

The present invention effectively solves the above-mentioned problems, and an object of the present invention is to reliably restrain the occurrence of vibration and the like in each part of the helical coil heat transfer tube to improve the earthquake resistance.

[Means for Solving the Problems] The heat transfer tube support structure of the present invention is such that each helical coil heat transfer tube is provided with a plurality of pairs of support members sandwiching them from the inside and outside of the spiral in the circumferential direction of the spiral. Set in a row in the radial direction and fastened to the support members of each pair to the surface of the support member in the adjacent helical coil heat transfer tube by passing through both in the radial direction of the spiral and fastening bolts that integrally fix them to each other. Arrange a centering bolt that contacts the state,
A notch and a groove are formed on the outer side and the inner side of one of the support members to suppress the movement in the circumferential direction by fitting the other support member, and the centering bolt is provided between the notch and the groove. A technique is adopted in which a female screw hole into which is screwed is formed in a penetrating state.

"Operation" In the heat transfer tube support structure of the present invention, since the support member holds each helical coil heat transfer tube,
Fluctuations in the helical pitch of the helical coil heat transfer tube are constrained, and since each support member is stretched radially outward by the centering bolt, the mutual spacing in the radial direction of each helical coil heat transfer tube is fixed. It is also possible to hold it at the same time and restrain the movement of the spiral in the longitudinal direction and the circumferential direction. That is, the pressing amount of the surface of the other support member is adjusted by the screwing state with the female screw hole in the centering bolt, and the mutual spacing in the radial direction of each helical coil heat transfer tube is set. By fitting the other support member into the notch and the groove, the movement in the circumferential direction is suppressed.

[Embodiment] An embodiment of the heat transfer tube support structure of the present invention will be described below with reference to FIGS. 1 to 4.

Also in this heat exchanger, a center pipe 3 is vertically provided in the center of a tower-shaped body (not shown), and a plurality of helical coil heat transfer tubes 1 having different spiral diameters are concentrically provided outside the center pipe 3. Each of the helical coil-shaped heat transfer tubes 1 is arranged in a plurality of pairs of support members 11A.
・ Holded by 11B. A plurality of positioning members 12 are provided on the outer surface of the center pipe 3 in the circumferential direction, for example.
The support members 11A are arranged at 60 ° intervals and at intervals in the length direction.
・ 11B are arranged so that they are lined up in the radial direction.

The pair of support members 11A and 11B are formed in a rod shape as a whole along the lengthwise direction of the spiral, and as shown in FIG.
Recesses that engage approximately half of the outer circumference of the pipe that constitutes the
A plurality of 13 are arranged at the same intervals as the pitch of the spiral. Further, one of the support members (support member arranged inside the spiral of the helical coil heat transfer tube 1) 11A is formed wider than the other support member (support member arranged outside the spiral) 11B. As a result, notches 15 for fitting the protrusions 14 of the other support member 11B are formed in the protrusions 14 formed between the recesses 13, and the adjacent helical coil-shaped conductor is formed on the outer surface. A groove 16 that engages with the support member 11B in the heat pipe 1 is formed. Then, the support members 11A and 11B are butted against each other in a state in which the protrusion 14 is fitted in the cutout portion 15, so that the helical coil-shaped heat transfer tube 1 arranged in the recesses 13 is formed.
It is designed to be held together, and is integrated by screwing a fastening bolt 17 into the butted portion.

In this case, the one support member 11A is provided with a female screw hole 21 at each abutting portion in a penetrating state, and the other support member 11B is provided with a part of the support member 11A as shown in FIGS. A stepped insertion hole 22 is formed leaving the butted portion, and a straight insertion hole 23 is formed in the remaining portion, and the fastening bolt 17 stores the head in each stepped insertion hole 22. It is arranged in a state.
Then, a straight centering bolt 24 is inserted into the straight insertion hole 23 and screwed into the female screw hole 21, and the tip of the centering bolt 24 projects from the female screw hole 21 and is radially inward. It is in contact with the outer surface of the support member 11B of the helical coil heat transfer tube 1 at the position. A protrusion 25 having the same width as that of the support member 11B is formed along the length direction on the positioning member 12 of the center pipe 3, and the groove 1 of the support member 11A in the helical coil heat transfer tube 1 of the innermost layer is formed.
6 which is engaged with the centering bolt 24 of the support member 11A.
Is in contact with the surface of the protrusion 25 of the positioning member 12. Then, the centering bolts 24 press the inner support member 11B or the positioning member 12 so that each helical coil heat transfer tube 1 is radially outwardly stretched.

The pair of support members 11A and 11B holding the helical coil heat transfer tube 1 and the fastening bolt 17 are welded after fastening, and the centering bolt 24 is also welded to the support member 11B after centering adjustment. In addition, the support members 11A ・ 11
A sleeve 26 surrounding the helical coil heat transfer tube 1 is arranged in the portion held by B so as to relieve the stress concentration on the tube.

With such a support structure, the helical pitch of each helical coil heat transfer tube 1 has a support member 11A.
-Fixed according to the arrangement pitch of the concave portions 13 of 11B, and restrain the fluctuation. In addition, each support member 11A, 11B,
The groove 16 and the notch 15 are engaged with each other, and the support member 11A of the innermost layer is engaged with the positioning member 12 of the center pipe 3, so that the support member 11A is reliably aligned in the radial direction and has a circumferential position. It is fixed, and movement of the helical coil heat transfer tube 1 in the circumferential direction can be restricted. Further, by radially extending the centering bolts 24, the radial coil-to-tube heat transfer tubes 1 are kept at a constant mutual distance in the radial direction, and the helical coil-to-tube heat transfer tubes 1 are concentric around the center pipe 3. It is possible to maintain the shape of the helical coil-shaped heat transfer tube 1 and prevent the support members 11A and 11B from moving in the lengthwise direction.

In addition, by arranging support beams for suspending each support member radially on the center pipe, or by providing a pedestal for supporting each support member from below, the self-weight of the helical coil heat transfer tube may be supported. Good.

[Advantage of Invention] As is clear from the above description, according to the heat transfer tube support structure of the present invention, the helical pitch of the helical coil heat transfer tube varies due to the support member holding each helical coil heat transfer tube. It is possible to set the radial mutual intervals of the helical coil heat transfer tubes to be constant by the centering bolts that are constrained and each support member is stretched outward in the radial direction, and one support By fitting the other support member into the notch and the groove of the member, the movement in the circumferential direction can be restrained. Therefore, it is possible to reliably maintain the mutual interval of the tubes forming each helical coil heat transfer tube, to restrain the fluctuation during an earthquake, etc., and to improve the earthquake resistance.

[Brief description of drawings]

FIG. 1 is a horizontal cross-sectional view of a main part showing an embodiment of the heat transfer tube support structure of the present invention, FIG. 2 is a vertical cross-sectional view taken along line II-II of FIG. 1, and FIG. 3 is of FIG. Fourth vertical sectional view along line III-III, No. 4
FIG. 5 is an exploded perspective view of the support member in these figures, and FIG. 5 is a front view showing an example of a conventional support structure. 1 ... Helical coil heat transfer tube, 3 ... Center pipe, 11A / 11B ... Support member, 12 ... Positioning member,
13 ... recess, 14 ... projection, 15 ... notch, 16 ... groove,
17 …… tightening bolt, 21 …… female screw hole, 22 …… stepped insertion hole, 23 …… straight insertion hole, 24 …… centering bolt,
25 …… Protrusion, 26 …… Sleeve.

Claims (1)

(57) [Scope of utility model registration request] 1. A plurality of pairs in which a plurality of helical coil heat transfer tubes (1) are arranged concentrically with an interval between each other, and each helical coil heat transfer tube holds them from the inside and the outside of the spiral. The support members (11A) and (11B) of (1) are provided at intervals in the circumferential direction of the spiral and are arranged in the radial direction, and the fastening bolts (17) for integrally fixing the two to the support members of each pair, and the two of the spiral members. Centering bolts (24) that penetrate in the radial direction and abut against the surface of the support member in the adjacent helical coil heat transfer tube in a pressed state are provided, and the support of the other is provided on the outside and the inside of one support member. Notches (15) and grooves (1) that fit the members together to prevent circumferential movement
6) is formed, and a female screw hole (21) into which the centering bolt is screwed is formed in a penetrating state between the notch and the groove. Support structure.