JP2544441B2 - Manufacturing method of parallel flow multi-tube heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cooler for a nuclear power plant, a chemical device, etc., and in particular, to manufacture a multi-tube heat exchanger in which a body fluid flows in parallel with a heat transfer tube. Concerning the law.

[Conventional technology]

In the conventional apparatus, as described in JP-A-57-498, a method of supporting a heat transfer tube by inserting a rod between the heat transfer tubes as a support member of the heat transfer tube has been adopted.

The rod is fixed to a ring provided on the outer circumference of the heat transfer tube group by welding or the like. The rods are assembled by intersecting at right angles or at 60 ° by the arrangement of heat transfer tubes.
In this way, the rod-full unit is assembled, and a large number of the rod-full unit are provided.

The conventional device has a drawback that the rigidity of the rod baffle is weak because the heat transfer tube and the gear gap of the heat transfer tube are small.

Further, as a method of preventing this, a method of enlarging the pitch of the heat transfer tube and enlarging the rod diameter of the rod baffle can be considered, but if the pitch of the heat transfer tube is increased, the flow passage area of the body side fluid increases, There was a problem that the flow velocity of the body side fluid became slow and the heat transfer performance deteriorated.

The adoption of corrugated plates having unevenness in the axial direction of the heat transfer tube is a means for achieving improved support synthesis of the heat transfer tube and improved heat transfer performance. 3929
No. 2 and No. 59-130985.

[Problems to be Solved by the Invention]

When a corrugated sheet is used, if the corrugated sheet is used in a shape that supports the heat transfer tube when assembling the heat exchanger, when the heat transfer tube is inserted between the corrugated sheets and assembled, the heat transfer tube and the corrugated sheet interfere with each other. Therefore, the heat transfer tube is easily damaged. By the way, if an excessive gap is set between the corrugated plates for the heat transfer tube insertion work, the interference force between the heat transfer tube and the corrugated plate during the heat transfer tube insertion work will be small and damage to the heat transfer tube will be reduced, but after assembly Since the pressing force of the tube between the heat transfer tube and the corrugated plate is weakened by the existence of the excessive gap, the support force of the heat transfer tube is weak and the heat transfer tube is easily vibrated by the fluid, and the heat transfer tube is damaged.

An object of the present invention is to provide a method of manufacturing a heat exchanger that can prevent damage to the heat transfer tube when assembling or using the heat exchanger using a corrugated plate as a heat transfer tube supporting member.

[Means for solving the problem]

To achieve the above object, the present invention mainly includes a water chamber, a body, a large number of heat transfer tubes provided inside the body, and a grid-shaped heat transfer tube support member provided at a plurality of positions for supporting the heat transfer tubes. In manufacturing a parallel-flow multi-tube heat exchanger in which the body side fluid as a component flows in parallel with the heat transfer tubes, ring-shaped plates are provided at both ends of a grid-like corrugated plate having irregularities in the axial direction of the heat transfer tubes. Are fitted and fixed so that a gear is provided between the plates, and the two corrugated plates are compressed by bolts to narrow the gears of the rings to compress the lattice corrugated plate. By fixing the heat transfer tubes to each other by enlarging the unevenness thereof, the heat transfer tubes can be easily assembled and manufactured without damaging the heat transfer tubes.

[Action]

If you insert a heat transfer tube between each corrugated plate and then compress the corrugated plate, the unevenness of the corrugated plate will be compressed and the height difference of the unevenness of the wavelength will be expanded, and the heat transfer tube and the corrugated plate will be in firm contact. Even if the vibration of the heat transfer tube is loosened because the support between the heat transfer tube and the corrugated plate is damaged before inserting the heat transfer tube before assembly, it is possible to reliably suppress the vibration after assembly. .

〔Example〕

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

In the body 1 of the parallel-flow multitubular heat exchanger, a plurality of tie rods 13 are installed at positions closer to the inner surface of the body 1 in a posture parallel to the heat transfer tubes 5.

Each tie rod 13 is fixed to the tube plate of the heat exchanger, and the spacer 12 is fitted around it.

Each tie rod 13 is inserted into two rings 7A arranged so as to surround a group of heat transfer tubes 5, and the left ring 7A of the two rings 7A hits the right end of the spacer 12 and is stopped. .

A female screw of a nut 14 is combined with a male screw formed on the right end of each tie rod 13.

In this state, the two rings 7A have a large horizontal gap.

Both ends of a corrugated plate 6 serving as a heat transfer tube supporting member are previously fixed to the two rings 7A so as to be arranged between the heat transfer tubes 5.

 The heat transfer tube support member 11 is configured as described above.

At the time of such a construction, the height of the corrugated peaks is slightly lower than the heat transfer tube interval.

The heat transfer tube 5 of the heat exchanger is put in the body 1 and inserted between the corrugations 6.

At the time of insertion, the height of the corrugated peaks of each corrugated sheet 6 is slightly lower than the heat transfer tube spacing to ensure a wider spacing of the corrugated sheet 6 than the outer diameter of the heat transfer tube 6. Damage to the heat transfer tube 5 due to strong pressing between the corrugated plate 5 and the corrugated plate 6 is suppressed.

When the insertion work of all the heat transfer tubes to be supported by the corrugated plate 6 is completed, the nut 14 at the end of the tie rod 13 is tightened to narrow the horizontal gap between the two rings 7A, that is, the gap between the two rings 7A.

In this way, as the gear gap between the two rings 7A narrows, the corrugated plate 6 changes from the state of FIG. 1 to the state of FIG. 2 and is compressed to greatly expand the wave height,
The heat transfer tube 5 is strongly pressed against the heat transfer tube 5 to form a strong heat transfer tube supporting state.

After tightening the tie rod, insert the heat transfer tube 5 into the other tube plate, and then insert the assembled assembly of the heat transfer tube support member 11, the heat transfer tube 5, both tube plates, the tie rod 13, the nut 14 and the spacer 12 into the body. It is inserted in 1 and it is liquid-tightly connected with both tube sheets and the body 1.

During operation of the heat exchanger, cooling water enters through the pipe side inlet nozzle, flows through the transfer pipe 5 and exits through the pipe side outlet nozzle, as in the conventional case. The fluid to be cooled on the cylinder side enters through the cylinder-side inlet nozzle, flows outside the heat transfer tube 5 substantially parallel to the heat transfer tube, and exits through the cylinder-side outlet nozzle.

Since the waveform 6 has a shape having irregularities in the direction perpendicular to the flow of the body-side fluid, the flow is disturbed by the waveform 6 and the heat exchange efficiency is improved.

When the heat exchanger is in use, the compressed corrugated sheet 6 firmly supports the heat transfer tube 5, so that the heat transfer tube 5 is prevented from being damaged by vibration of the heat transfer tube 5 due to the flow of the body side fluid. ing.

According to this embodiment, the corrugated plate 6 and the gear cups of the heat transfer tube 5 are
Since the heat transfer tube is large when it is inserted, it can be assembled without damaging the heat transfer tube 5. After the heat transfer tube is assembled, the corrugated plate 6 and the heat transfer tube 5 have small gears, so that the support force of the heat transfer tube 5 increases. It is possible to prevent damage to the heat transfer tube due to vibration of the heat transfer tube due to the fluid.

〔The invention's effect〕

According to the manufacturing method of the heat exchanger of the present invention, the heat exchanger having high heat exchange performance is protected against damage to the heat transfer tube during the assembly of the heat transfer tube into the heat transfer tube supporting member and the manufacturing and use of the heat exchanger after assembly. It can be provided while suppressing.

[Brief description of drawings]

FIG. 1 is a diagram showing a state immediately after inserting a heat transfer tube into a heat transfer tube support member of a heat exchanger according to an embodiment of the present invention. FIG. 2 is a diagram showing a completed state of the heat transfer tube supporting state by the heat transfer tube supporting member of the heat exchanger according to the embodiment of the present invention. 1 ... Body, 5 ... Heat transfer tube, 6 ... Corrugated plate, 7A ... Ring, 11 ... Heat transfer tube support member, 12 ... Spacer, 13 ... Tie rod, 14 ... Nut.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoichi Ubakai 3-1-1, Saiwaicho, Hitachi, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Koji Kontani 3-chome, Saiwaicho, Hitachi, Ibaraki No. 1 in Hitachi New Clear Engineering Co., Ltd. (56) References Actual Open Sho 59-130992 (JP, U) Actual Open Sho 61-39292 (JP, U) Actual Open Sho 59-130985 (JP, U)

Claims (1)

(57) [Claims] 1. A body side having a water chamber, a body, a large number of heat transfer tubes provided inside the body, and grid-shaped heat transfer support members provided at a plurality of positions for supporting the heat transfer tubes as main constituent elements. In manufacturing a parallel flow type multi-tube heat exchanger in which a fluid flows in parallel with a heat transfer tube, ring-shaped plates are provided between both ends of a grid-like corrugated plate having irregularities in the axial direction of the heat transfer tube. Fit and fix with a gap,
Further, the heat transfer tubes are fixed to each other by tightening the two ring-shaped plates with each other by bolts to narrow the gap of the ring and thereby compressing the grid-like corrugated plate to expand the unevenness thereof. Of parallel flow type multi-tube heat exchanger.