JPS5912294A - Production of multitubular-type heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a multitubular-type heat exchanger having a little pressure loss and a high heat-exchanging efficiency, by a method wherein plate members so bent as to form a part of a spiral are sequentially connected to each other to constitute a spiral baffle plate. CONSTITUTION:A blank plate formed by blanking from a metallic plate is bent by press working to obtain a spiral from having a pitch equal to one half of a predetermined pitch, thereby producing the plate member 11. The obtained plate members 11 are arranged as to form a continuous spiral at the outside peripheral surface of a central shaft S, and end edges 14 are jointed by welding to produce the baffle plate B having a predetermined length. The baffle plate B is inserted into a shell C, both ends of the shaft S are brought into contact with tube plates D, and bonnets E, F are provided on the outer sides thereof to assemble the multitubular-type heat exchager. Accordingly, since the plate members 11 can be easily produced by press working or casting, a large-type heat exchanger comprising a spiral baffle plate B can be produced extremely easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for manufacturing a multi-tube heat exchanger in which a baffle plate installed in a body and supporting a large number of tubes is formed in a spiral shape;
In particular, it relates to a method of providing a baffle plate in a spiral shape on the outer peripheral surface of a central shaft.

In a multi-tubular heat exchanger, in order to improve the efficiency of heat exchange between the fluid flowing inside the body and the fluid flowing inside the tubes, a baffle plate is provided to allow the fluid inside the body to flow across the tubes. is well known.

There are various shapes of baffle plates, but the most commonly used is a circular plate with a part of the disc cut out, and the notches are alternately positioned on opposite sides to obtain the required σ ~ 1. They are placed in the body at regular intervals so that the fluid flows meanderingly across the tubes. The size of the notch is determined by taking into account the flow velocity, flow rate, etc., since the fluid passes through this notch and flows while repeatedly changing direction by 180 degrees.

Pressure loss occurs every time there is a change in direction. Fluid stagnates in the part of the horse surrounded by the baffle plate and body, impeding heat exchange.

There were other problems. On the other hand, 1:00 a.m.
The spiral baffle plate disclosed in Japanese Utility Model Publication No. 5547 and Japanese Utility Model Application Publication No. 55-73190 can be formed into a shape that follows the natural flow of fluid, so it significantly reduces pressure loss and reduces stagnation. It has advantages such as good heat exchange efficiency because of its low temperature and high C.

Suitable for heat exchangers that handle oil.

However, it is extremely difficult to manufacture a helical baffle plate that is heavy-bearing and twists into a plurality of coils to form a continuous flow path. In other words, fIAU can be manufactured by casting, but large ones require a long mold, so it is practically impossible to manufacture only small ones.Also, it is thought that it can be made into a coiled metal plate and processed into a baffle plate. However, it was extremely difficult to make the coiled metal plate itself, and shell-and-tube heat exchangers equipped with spiral R plates were hardly ever put into practical use.

The present invention solves these problems and provides a multi-tubular heat exchanger, both small and large, that has low pressure loss and good heat exchange efficiency by manufacturing spiral baffle plates at low cost and easily. α) was invented for the purpose of

2. The present invention achieves this objective.

- Using a plate member having a length equal to or less than one of the pitch parts and equally dividing the circumference, and having holes for supporting the tube and bent to form a part of the spiral, and the inner side of this plate member The gist is to form a continuous spiral baffle plate around the central axis by aligning the peripheral edge along the outer circumferential surface of the central axis and sequentially connecting the edges.

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

Figure 1 shows a raw material plate L formed by punching out a gold figurine plate, with the radius R equal to the radius of the central axis S placed at the center of the heat exchanger as the short axis, and the larger radius R2 as the short axis. It is formed to have a constant width to grow an elliptical arc-shaped inner circumferential edge 2 that has long sleeves, and an elliptical arc-shaped outer circumferential edge 3 is formed so as to be in contact with the inner surface of the body C of the heat exchanger. Further, a predetermined number of elliptical holes 50 whose diameter in the circumferential direction is larger than the diameter in the radial direction are provided in the material plate 1 at a predetermined interval, and the two edges 4 of the material plate 1 are connected to the short axis. and is formed on a straight line passing through the center of the long sleeve.

Next, the above-mentioned raw material plate 1 is bent by press working into a helical shape with a predetermined pitch of one pitch, thereby forming a plate member 11 as shown in FIG. 2.3. By bending the raw material plate 1, the inner peripheral edge 2. The outer circumferential edge 3 is formed on the inner circumference a12#outer circumferential edge 13 having an arcuate shape, and the two edges 4 are formed on the edge 14 arranged on one diameter of the central axis S,
An oval hole 5 is formed in a circular hole 15 through which the pipe P is supported.

The plate members 11 thus formed are arranged so that a continuous spiral is formed by bringing the inner periphery @ 12 into contact with the outer surface of the central axis S with almost no gap, and the mating edges 14 and 14 are welded. The baffle plate B of a predetermined length is made by sequentially connecting the baffle plates B. In this case, at least the plate members 11 at both ends may be welded and fixed to the central axis S. I cut it. A part of the pipe P is arranged in advance parallel to the central axis S and the hole]5
are fitted into this pipe P, and the plate members 11 are sequentially connected while being shifted in the axial direction.

The corresponding holes 15 of each plate member 11 can be accurately aligned on a straight line, making it easier to penetrate the remaining pipes P (see FIG. 4). Motoo.

The old plate portion 11 is approached from the outside, brought into contact with the outer circumferential surface of the center shaft S, and connected sequentially by bath welding.

FIG. 5 shows an am#21 formed into a spiral shape with a one-third pitch, and the inner peripheral edge 22. Outer periphery 23 that is almost in contact with the fuselage C. It has a hole 25 for penetrating and supporting the pipe P, and two edges 24 are provided with projecting edges 27 having attachment holes 26. The projecting edge 27 is the plate member 2
1/3 of the thickness, and these are overlapped [plate member 2 by inserting a rivet or bolt into the mounting hole 26 (C) and tightening] are sequentially connected, and the continuous spiral baffle plate B is the center. formed around an axis S.

In this way, the bonnets E and F are provided on the baffle plate B around the central axis S, and a multi-tubular heat exchanger as shown in FIG. 6 is assembled.

The order of this assembly is arbitrary.

The fluid on the body side flows in from an inlet C1 at one end of the body C, spirals along the baffle plate BK, and flows out from an outlet C2 at the opposite end. The fluid on the pipe side flows in from the inlet E of one bonnet E, flows through some pipes P, reverses at the opposite bonnet F, flows through another pipe P, and flows out from the outlet E2.

In addition, the central axis S may be formed hollow to allow the pipe-side fluid to flow, or the baffle plate B may be formed in double or more layers to form a plurality of flow paths.

Although the plate members forming the baffle plate B are made at one-third pitch or at one-third pitch, it is of course possible to make them at, for example, one-quarter pitch, that is, the length that divides the circumference into four equal parts. . Further, this plate member may be made by casting instead of being made by pressing a metal plate, and in some cases, it may be made of synthetic resin. When plate members are made of synthetic resin, they can be connected to each other with adhesive to form a spiral baffle plate.

As described above, according to the present invention, - a plate member is used which has a length equal to or less than one-third of the pitch and which equally divides the circumference and is bent to form a part of a spiral; Since the inner periphery of the plate is aligned with the outer surface of the central axis and the edges are sequentially connected, a large number of plate members can be easily arranged using the central axis as a guide ruler, making it possible to create an accurate spiral baffle plate. Since a plate member with a length that appropriately divides two circumferences can be easily made by press working or casting, a large heat exchanger with a spiral baffle plate can be manufactured extremely easily. . Also, since the plate member divides the circumference into equal parts,
When these tubes are connected one after another, the holes that support the tubes are aligned on an axis parallel to the central axis, which has the advantage of facilitating the work of inserting and assembling the tubes.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a front view of a raw material plate for forming a plate member, FIG. 2 is a side view of the plate member, FIG. 3 is a front view thereof, and FIG. 4 FIG. 5 is a perspective view of a different embodiment of the plate member, and FIG. 6 is a longitudinal sectional view showing an example of a heat exchanger manufactured according to the present invention. 11.21...Plate member, 12.22...
...Inner periphery. 14.24...-edge, 5.25... hole, B... baffle plate. C...Body, S...Central axis, P...
···tube. Agent Mutsumi Nozawa Aki (11) Figure 1 Figure 4

Claims (1)

[Claims] A plate member is used, which has a length equal to or less than half of one pitch and equally divides the circumference, has a hole to support the pipe, and is bent to form a part of a spiral. A method for manufacturing a multi-tube heat exchanger, characterized in that a continuous spiral baffle plate is formed around a central axis by sequentially connecting the peripheral edges along the outer surface of the central axis.