JPH0249513Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a side member of a heat exchanger that is fastened with bolts, and relates to a side member that is configured so that no residual stress is generated during assembly.

[Prior art and its problems] In particular, there has been a relatively large heat exchanger used in construction machinery and the like as shown in FIG. 2. This heat exchanger has a large number of tubes 1 located in parallel, and fins 15 are disposed in contact between them. At the same time, a pair of tube plates 2, 2 are fixed to both ends of each tube 1 by brazing to form a heat exchanger core. Then, a side member 14 with a distance slightly shorter than the distance between the pair of tube plates 2, 2 is manufactured in advance, and a space adjustment not shown is provided between the upper surface of the flange portion of the side member 14 and the lower surface of the tube plate 2. Insert a thin iron plate (shim). Then, the tank body 6 is brought into contact with the other end of the tube plate 2 via a packing 9, and they are integrally fastened and fixed with fasteners 5 such as bolts.

However, in such a fastening type side member, residual stress is generated in the tube plate 2 during assembly, and thermal stress, vibration, and other stresses are superimposed on the residual stress during use, resulting in cracks in the brazed part or damage to other parts. This caused damage and reduced durability.
This is based on the fact that it is difficult to accurately match the distance between the pair of upper and lower tube plates 2, 2 and the length of the side member 14 even if the thin plates and the like are included. In particular, since tube plate 2 and tube 1 are integrally fixed by brazing or other means, there will be some variation in the spacing between the upper and lower tube plates, which will require additional side member assembly work. This becomes troublesome and causes the residual stress described above.

[Summary of the idea]

Therefore, the present invention aims to provide a side member structure for a heat exchanger that eliminates the above-mentioned problems, and its gist is as follows.

A large number of tubes 1 through which a heat exchange medium flows are arranged in parallel, and both ends of each of the tubes 1 are inserted into a pair of elongated tube plates 2 having flanges extending around the periphery, and the inserted portions are brazed together. Two pairs of brackets 12, which are fixed to form a heat exchanger core and have screw holes 10 formed on their sides for attaching side members, are arranged at the upper and lower ends on both sides of the core, and the flanges 4 of the brackets 12 and both longitudinal edges of the flange portion of the tube plate 2 are fastened and fixed via a fastener 5, and a core length adjustment hole 11 having a size sufficiently larger than the diameter of the screw hole 10 is formed. A pair of side members 7, each having a hole drilled at both ends thereof, are positioned such that the holes 11 are aligned with the screw holes 10, respectively.
This is a side member structure of a heat exchanger in which bolts 8 are fastened and fixed to.

[Example of idea]

Next, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is an explanatory diagram of the assembly of the side member of the present invention.

The side member structure of this embodiment differs from the conventional one in that the side member 7 is fastened and fixed to a pair of upper and lower brackets 12 with bolts 8 through holes 11 that are elongated holes. Although only one side member is shown in this embodiment, a similar side member can be attached to the other side as well.

Therefore, to assemble this side member, proceed as follows.

First, the opening edges of the tank body 6 are brought into contact with one side of the pair of upper and lower tube plates 2 of the heat exchanger core 3 via the gaskets 9, respectively. At the same time, a first bracket 12 is attached to the other surface of the tube plate 2.
They abut as shown in the figure, and are integrally fastened and fixed using the fastener 5. Next, the screw hole 10 previously drilled in the bracket 12 and the elongated hole 11 of the side member 7 are aligned, and the bolt 8 is screwed into place.
Then, bolts 8 may be fastened to the upper and lower tube plates 2 in a free state so that the assembly stress does not change. That is, since the holes 11 formed at both the upper and lower ends of the side member 7 are formed longer than the screw holes 10 of the bracket 12 at least in the vertical direction, even if manufacturing variations occur in the length of the core 3, the holes 11 This is to be absorbed by the margin.

[Effect of idea]

(1) The side member of this structure is divided into parts that can be moved toward and away from one or more positions in the longitudinal direction, and the total length when joined can be finely adjusted, so the side member is fastened and fixed to the tube plate. When doing so, it is possible to prevent initial stress from being generated in the tube plate during assembly, thereby improving durability during use of the heat exchanger. That is, since the distance between the upper and lower tube plates varies to some extent due to manufacturing technology, when fixing the upper and lower ends of the conventional side member 14 as shown in FIG. It was difficult to completely eliminate the stress associated with this. Therefore, if the heat exchanger is used with residual stress still present, thermal stress and stress due to vibration will be superimposed on it, causing cracks, especially at the bases of tube 1 and tube plate 2, and causing liquid leakage and other accidents. However, it had the drawback of lacking durability. However, according to this structure, the distortion caused by assembling the side member can be completely eliminated by the core length adjustment hole 11 which is sufficiently larger than the diameter of the screw hole 10, and the side member can be assembled. Therefore, no residual stress or the like is generated in the tube plate 2, and a heat exchanger with excellent durability can be provided.

(2) Furthermore, according to the present side member structure, it is extremely easy to finely adjust the overall length of the side member so as not to cause distortion during assembly, so assembly is easy and assembly time can be shortened. In other words, conventional side members require troublesome measures such as interposing a thin metal plate (shim) between the upper end of the side member and the tube plate to remove strain, but despite this, it is difficult to eliminate residual stress completely. could not be removed. In addition, in order to adjust it within a certain level of residual stress,
Although a lot of man-hours were required for assembly, according to the present structure, the entire length of the side member itself is formed to be expandable and retractable, so such troublesome assembly is not required.

[Brief explanation of the drawing]

FIG. 1 is an explanatory perspective view of main parts of a side member of the present invention, and FIG. 2 is a perspective view of a conventional side member. 1...Tube, 2...Tube plate, 3
... Heat exchanger core, 4 ... Flange, 5 ... Fastener, 6 ... Tank body, 7, 14 ... Side member, 8 ... Bolt, 9 ... Packing, 10 ...
Screw hole, 11... Long hole, 12... Bracket, 1
5... Huynh.

Claims (1)

[Scope of utility model registration request] A large number of tubes 1 through which a heat exchange medium flows are arranged in parallel, and both ends of each of the tubes 1 are inserted into a pair of elongated tube plates 2 having flanges extending around the periphery, and the inserted portions are brazed together. Two pairs of brackets 12, which are fixed to form a heat exchanger core and have screw holes 10 formed on their sides for attaching side members, are arranged at the upper and lower ends on both sides of the core, and the flanges 4 of the brackets 12 and both longitudinal edges of the flange portion of the tube plate 2 are fastened and fixed via a fastener 5, and a core length adjustment hole 11 having a size sufficiently larger than the diameter of the screw hole 10 is formed. A pair of side members 7, each having a hole drilled at both ends thereof, are positioned such that the holes 11 are aligned with the screw holes 10, respectively.
The side member structure of the heat exchanger is formed by fastening and fixing bolts 8 to the side member structure.