JPS62272097A - Multi-tube cylindrical heat exchanger - Google Patents

Abstract

PURPOSE:To obtain tie rods strong in strength against fatigue even when they are vibrated, by a method wherein the title heat exchanger is made by a structure in which the screw thread of the tie rod, which is screwed into the fore tube plate of the multi-tube cylindrical heat exchanger, is denied and the tip end of the tie rod is made round without notches while the tie rod is penetrated through the fore tube plate. CONSTITUTION:Fluid A flows into a heat exchanger through a fluid entrance nozzle 8a and hits once a shock absorbing plate 9 at the entrance of the fluid, then is distributed, therefore, Karman vortex is generated below the shock absorbing plate 9 at the entrance of the fluid. Further, the force of water hammer F is exerted on the shock absorbing plate 9 by the fluid A which flows into the heat exchanger through the fluid entrance nozzle 8a, therefore, they provide spacers 6 and penetrating type tie rods 15 with vibration. The penetrating type tie rod 15 is penetrated through a penetrating hole 15a provided on a fore tube plate 3a and is fixed thereto through welding Wr. On the other hand, the shock absorbing plate 9 at the entrance of the fluid is welded to the spacers 6 and is fitted to the penetrating type tie rods 15. A round rod is used as the tie rod 15 as it is, whereby the sectional area as well as the modulus of section thereof may be increased and the strength as well as the fatigue strength may be increased since the rod has no notch.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Industrial application field] The present invention relates to a multi-tubular cylindrical heat exchanger.

[Conventional technology]

As shown in FIG. 5, the multi-tubular cylindrical heat exchanger has a body 1. Water chamber 2. Tube plate 3. Panful 4. Tie rod5. Spacer 6, heat transfer tube 7. It is composed of a fluid inlet/outlet nozzle 8 and a fluid inlet buffer plate 9.

The heat exchanger tube 7 is fixed to the tube plate 3 and supported by a panfle 4, and the panfle 4 is fixed to the tie rod 1 5 and a spacer 6.

One end of the tie rod 5 is screwed to the tube plate 3, and the other end is screwed with a nut 10.

In addition, when fluid A flows in from the fluid inlet nozzle 8, a buffer plate 9 is provided at the fluid inlet portion to prevent the fluid A from directly hitting the heat transfer tube 7.
has been established.

The fluid inlet buffer plate 9 is fixed to the spacer 6 by welding, and the spacer 6 is inserted into the tie rod 5.

FIG. 6 shows an example of the method of assembling the structure of the prior art.

First, (1) as shown in the figure, tie rod screw holes 5a and heat transfer tube holes 7a are bored in the front tube plate 3a.

Next, (2) as shown in the figure, the body 1 is joined to the front tube plate 3a by welding or the like, and the tie rod 5 is screwed into the tie rod screw hole 5a provided in the front tube plate 3a.

Next, (3) as shown in the figure, spacer 6 is attached to tie rod 5.
and panful 4 in turn.

When the spacer 6 and baffle 4 are all inserted into the tie rod S, (4) as shown in the figure, tie rod screw 5b
Press the spacer 6 and panfur 4 with the nut 10.

Next, (5) as shown in the figure, the rear tube plate 3b where the heat transfer tube holes 7a are opened is joined to the body 1 by welding etc., and finally (6)
As shown in the figure, the heat exchanger tubes 7 are inserted into the heat exchanger tube holes 7a formed in the front tube plate 3a and the rear tube plate 3b, and the baffle holes 4a formed in the baffle 4, and the multi-tube cylindrical heat exchanger is assembled. Finished assembling the tube bundle.

In the conventional structure assembly method, the spacer 6 and the panfur 4 are inserted into the tie rod 5.

If the body 1 was not machined into a perfect circle, the insertion work would be very tedious and one assembly process would take too many man-hours.

[Problems to be Solved by the Invention] In the structure of the prior art described above, as shown in FIG. 7, the fluid Δ flowing in from the fluid inlet nozzle 8a once hits the fluid inlet buffer plate 9, A Karman vortex K is generated below the buffer plate 9, and the fluid A flows in from the fluid inlet nozzle 8a.

Since it hits the fluid inlet buffer plate 9, water hammer force F acts.

On the other hand, the tie rod 5 is attached to the front tube plate 3 as shown in FIG.
A tie rod screw 5c is provided at the tip of the tie rod 5 so as to be screwed into the tie rod screw hole 5a provided at a.

However, as explained above, due to the generation of Karman vortices and the action of water hammer force F, the tie rod 5 always vibrates ft6.Furthermore, since the tip of the tie rod 5 is screwed into the front tube plate 3a, the tie rod tip screw 5c is cut out.

The tie rod screw root 5d has a notched shape, and no consideration has been given to fatigue strength, resulting in a problem of fatigue failure.

An object of the present invention is to provide a structure of the tie rod 5 that is strong against fatigue even when the tie rod 5 vibrates ftL.

[Means for solving problems]

The above problem was solved by eliminating the threaded part of the tie rod that is screwed into the front tube plate of the multi-tube cylindrical heat exchanger, and by making the tie rod tip a round bar without a notch, and creating a structure in which the tie rod penetrates the front tube plate. resolved.

[Effect]

Even if the tie rod is subjected to vibrations caused by Karman vortices and water hammer force, the tie rod has no cutout and is made of a round bar, so it is strong against fatigue.
There is less risk of fatigue failure.

〔Example〕

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

FIG. 1 shows the overall configuration of the multi-tubular cylindrical heat exchanger of the present invention.

The fluid A on the side to be cooled flows in from the fluid inlet nozzle 8a provided in the body 1, and once hits the fluid inlet buffer plate 9,
The force of the fluid is relaxed (divided) and flows into the body 1.

The fluid A that has flowed into the body 1 flows on the outer surface of the heat transfer tube 7 while being bent by the baffle 4 (at this time, it is cooled and performs a predetermined heat exchange) and exits from the fluid outlet nozzle 8b. .

On the other hand, fluid B on the cooling side flows into the rear water chamber 2b from the fluid inlet nozzle 8c provided in the rear water chamber 2b, flows through the heat transfer tube 7 into the front ice chamber 2a, and exits from the fluid outlet nozzle 8d. .

At this time, the fluid A flows in from the fluid inlet nozzle 8a, once hits the fluid inlet buffer plate 9 and is divided, so a Karman vortex K is generated under the fluid inlet buffer plate 9, and further flows through the fluid inlet nozzle 8a. Water hammer force F acts on the fluid inlet buffer plate 9 due to the inflowing fluid, which gives vibration to the spacer 6 and the penetrating tie rod 15. Since it is fixed, the strength will be increased.

Here, the structure of the penetrating tie rod 15 of the present invention will be explained with reference to FIG. 2.

The penetrating tie rod 15 has a through hole 1 provided in the front tube plate 3a.
5a and fix it with welding Wr.

On the other hand, the fluid inlet buffer plate 9 is joined to the spacer 6 by welding and inserted into the penetrating tie rod 1S.

At this time, as explained above, vibrations due to the water hammer force F and the Karman vortex K are constantly acting on the penetrating tie rod 15 during operation, and repeated loads are acting on the penetrating tie rod 15.

However, in the case of the structure of the prior art (see FIG. 7), a tie rod screw 5c is cut at the tip of the tie rod 5.
Although it was weak against repeated loads, the penetrating tie rod 15 of the present invention has a large alignment by using a round bar as it is, and has strong strength and fatigue strength by not providing a notch.

Next, the assembly method of the present invention will be explained with reference to FIG.

First, (1) as shown in the figure, a through hole 15a for the penetrating tie rod 15 and a heat transfer tube hole 7a are made in the front tube plate 3a.

Next, (2) as shown in the figure, the body 1 is joined to the front tube plate 3a by welding or the like, and the through-type tie rod 15 is inserted into the through hole 15a by 1 minute of the length of the spacer 6. Insert the spacer 6 into.

Next, (3) as shown in the figure, insert the through-type tie rod 15 into one
spacer 6 and baffle 4 in the same manner as above, and repeat.

Next, (4) as shown in the figure, spacer 6 and panful 4
At the time when all the tubes have been inserted, the penetrating tie rod 15 and the front tube plate 3a are fixed by welding Wr.

Next, tighten the spacer 6 and the panfur 4 with the nut 10.

Next, (5) as shown in the figure, the fuselage 1 and the rear tube plate 3b are joined by welding etc., and finally (6) the front tube plate 3a is connected as shown in the figure.
Then, the heat transfer tubes 7 are inserted into the heat transfer tube holes 7a formed in the rear tube plate 3b and the baffle holes 4a formed in the baffle 4, thereby completing the assembly of the tube bundle of the multi-tubular cylindrical heat exchanger of the present invention. .

According to the present invention, the strength of the tie rod is increased, and
In the tube bundle assembly method, the spacer and baffle are inserted while passing the through-type tie rod through the front tube bundle by the length of the spacer, so even if the body is not perfectly round (
In the case of nuclear power generation equipment, 5 According to Ministry of International Trade and Industry Notification No. 501,
The difference between the maximum inside diameter and the minimum inside diameter in the same cross section passing through the center of the fuselage is allowed to be up to 1% of the nominal inside diameter. ) Since the length of insertion into the tie rod is the same at all locations, assembly work is facilitated.

Next, the present invention will be described in detail.6 The overall configuration of the multi-tubular cylindrical heat exchanger of the present invention using high-temperature fluid will be explained with reference to FIG.

When the high temperature fluid C flows into the body 1, the body 1 expands due to the heat.

At this time, if the materials of the body 1 and the heat exchanger tubes 7 are different, the amount of thermal expansion of the body 1 and the heat exchanger tubes 7 will be different, so in this case,
A body bellows 1a is provided in a body 1.

However, when the fuselage 1 is provided with the fuselage bellows 1a, there is a problem that the fuselage 1 loses its rigidity and the method of supporting the fuselage 1 becomes unstable, as in the case of the mocha structure shown in FIG. According to the application example, the fuselage 1 is
The rigidity of the can be improved.

〔Effect of the invention〕

According to the invention, when fluid enters the fuselage.

Even if the tie rod vibrates, the tie rod will not suffer from fatigue failure.

Furthermore, it can be used even when using high-temperature fluid.

Furthermore, the assembly method also facilitates assembly work.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a multi-tubular cylindrical heat exchanger according to an embodiment of the present invention, FIG. 2 is a detailed diagram of the fluid inlet section of FIG. 1, and FIG.
The figures are an explanatory diagram of the assembly method of Fig. 1, Fig. 4 is an overall configuration diagram of a multi-tubular cylindrical heat exchanger according to an application example of the present invention, and Fig. 5 is a conventional multi-tubular cylindrical heat exchanger. The overall configuration diagram, Figure 6, is
5 is an explanatory diagram of the assembly method, FIG. 7 is a sectional view of the fluid inlet part of FIG. 5, and FIG. 8 is a detailed diagram of the fluid inlet part of FIG. 5. Baffle, tie rod,
6... Spacer, 7... Heat exchanger tube, 9... Fluid inlet buffer plate. 15...Through type tie rod.

Claims (1)

[Claims] 1. A multi-tube cylindrical heat exchanger composed of a tube sheet, a tie rod, a spacer, a baffle, and a heat transfer tube, characterized in that the tube sheet is provided with a hole for a tie rod and a penetrating tie rod is provided. type heat exchanger.