JPS58209434A - Assembling method of multitubular heat exchanger - Google Patents

Abstract

PURPOSE:To manufacture efficiently a multitubular heat exchanger, by using a baffle plate as a relative positioning jig between respective pipes, fitting a guide jig to a pipe end, and shrinkage-fitting a pipe plate to a pipe group. CONSTITUTION:A pipe plate 2 is placed on a heating plate 1 and is heated, the pipe plate 2 becomes a prescribed temperature and a pipe hole 3 expands, and when the inside diameter becomes larger than the outside diameter of a pipe 4, all the pipes 4 are inserted vertically into the pipe hole 3. Subsequently, when the pipe plate is cooled by cutting off a heating source of the heating plate 1 and the pipe 4 is fixed, the pipe plte is removed from the heating plate 1, into which a necessary number of baffle plates 6 are inserted. Also, a guide jig 10 is fitted into the upper end of each pipe. Subsequently, when a heated pipe plate 7 is dropped into a group of the pipes 4, the group of the pipes 4 is supported by a baffle plate 6 having the same pipe hole pitch as that of the pipe plate 7, and also the guide jig 10 is provided on the upper end of the pipe, therefore, the pipe hole 3 is led to the upper end of the pipe 4 and is fitted.

Description

[Detailed description of the invention] The present invention mainly relates to a shell-and-tube heat exchanger for low BE.

The conventional method of assembling a heat exchanger as described above, especially regarding the method of assembling a straight tube type, is to attach the tube ends to the tube sheet, and then
There, methods such as roller expansion, γf' pressure expansion, etc. are applied to the tube.
It was a time-consuming task to install it for each book. Of course, if the pressure difference between the two heat exchange fluids is large, it is necessary to use a construction method that can sufficiently withstand pressure in the axial direction of the pipe and leakage, but when the pressure difference is small, a strong fixing method like this must be used. Although there are cases where it is not always necessary to use a multi-tubular heat exchanger with a small pressure difference, conventionally the labor-intensive method described above has been used. The purpose is to provide an efficient assembly method for a straight pipe type, and its gist is as follows. That is, a baffle plate is used as a jig for relative positioning between the tubes, a guide jig is attached to the tube end, and the tube sheet is shrink-fitted to the tube group. This will be explained with reference to the process diagrams of FIGS. 1 to 4.

In the figure, numeral 1 indicates a heating plate using electric heating, gas burner, etc., and a tube plate 2 is placed on the 7th plate and is heated (Fig. 1).

Here, the tube hole 6 of the tube plate 2 is machined to be smaller than the outer diameter of the tube 4. When the signboard 2 reaches a predetermined temperature and the tube hole 3 expands and its inner diameter becomes larger than the outer diameter of the tube 4, the entire tube 4 is inserted into the tube hole 6 as shown in Fig. 2, and then heated. Board 1
When the heating source is turned off and the tube sheet 2 cools down, the tubes 4 begin to stick to it.

This is lowered from the heating plate 1, and the required number of baffle plates 6 are inserted into it.The baffle plates 6 are at least 5y, and the two pieces with notches on opposite sides are made of tubes as shown in Fig. 6. A guide/jig 1o shown in side view in FIG. 5 is fitted into the end of each tube. The guide jig 1o is like a conical plug with a pointed upper end, and the diameter of one leg 10a is slightly smaller than the inner diameter of the pipe 4, and the diameter of the head 10b is slightly smaller than the diameter of the pipe hole 3. A heated tube sheet 7 is dropped into a group of tubes 4 prepared in one or more ways (FIG. 4). The group of tubes 4 is supported by a baffle plate B having the same tube hole pitch as the tube plate 7, and since there is a guide jig 10 at the tube end, the tube holes 6 are guided to the L end of the tubes 4 and fit there. Com. At this time, tube plate 7
has expanded, and its pipe hole pitch is slightly larger than that of the baffle plate 6, but this is due to the action of the guide jig 10 and the slight deflection of the pipe 4, as described in 1]2. There is no difficulty in fitting it in.

As described above, according to the present method, the labor involved in expanding each tube can be reduced.

[Brief explanation of the drawing]

Figures 1 to 4 show process diagrams of the method for assembling a multi-tubular heat exchanger according to the present invention. Figure 6 shows the state in which all the tubes are installed in the tube holes in the plate, and the tube group is lowered from the heating plate, and the baffle plate is inserted and fixed. Figure 4 shows the heated tube plate in the basin. 5th side view of the state in which the force adjustment lr is fitted into the guide jig.
The figure is a side view of the guide jig U. 1 Heating plate 2 tube plate 5 Tube plate tube hole 6 Baffle plate Z tube plate 10 Guide jig IQa same leg part 10 se same head applicant Mitsui Engineering & Shipbuilding Co., Ltd. Agent Kawa 1) Shigeo) 1 Figure 13 Figure 5 Kaya 2) I4 Figure 3

Claims (1)

[Claims] A method for assembling a multi-tube heat exchanger in which a baffle plate is used as a jig for relative positioning between tubes, a guide/jig is attached to the tube ends, and the tube sheet is shrink-fitted to the tube group.