JPH01273997A - Sheel and tube type heat exchanger - Google Patents

Abstract

PURPOSE:To enable a pressing force to be applied to a cooling pipe and fix the cooling pipe by a method wherein some baffle plates worked with some cooling pipe insertion holes being displaced by an assembly completion size are alternatively arranged to make a tube net. CONSTITUTION:Baffles plates are worked such that the plates arranged above a center of a heat exchanger (a) and the plates arranged below it (b) are displaced by a size alpha in respect to a size l. The baffle plates 1 are fixed in advance at positions where upper plates (a) and lower plates (b) are arranged. Pipe plates 4 are fixed to both ends of the baffle plates. The baffle plates and cooling pipe insertion holes of the pipe plates are located at positions where they are all coincided with other at their central points. The cooling pipes 2 are all inserted into the holes to form a tube nest. A barrel plate 3 is wound around an outer circumference of the cooling pipes so as to weld the barrel plate and the pipe plates. At this time, a pressing force is applied to the baffle plates from the barrel plate in a central direction to press the cooling pipe and thus the pipes can be fixed. Then, the cooling pipes and the pipe plates are fixed by an expanded pipe or braxing and lastly the side covers 5 and 6 of the coolant chamber are fixed by fastening some bolts or welding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shell-and-tube heat exchanger, and particularly to a structure suitable for fixing cooling pipes and baffle plates.

[Conventional technology]

The conventional technology is that the baffle plate has an insertion hole that is somewhat larger than the outer diameter of the cooling pipe, as described in 4 Mechanical Engineering Handbook "B Heat Exchangers, Air Conditioning, Refrigeration" New Edition, page B8-7, edited by the Japan Society of Mechanical Engineers. Processed to facilitate workability when assembling the heat exchanger.

Because there is a gap between this baffle plate insertion hole and the cooling pipe, if the flow rate of the fluid flowing in the river is excessive, this gap can cause the cooling pipe to vibrate and make abnormal noises, leading to cracking accidents. There was no consideration given to

[Problems that the invention helps solve]

The above conventional technology does not take into consideration the vibration caused by the contact between the cooling pipe and the baffle plate, which is caused by the gap between the cooling pipe insertion hole in the baffle plate and the cooling pipe, resulting in abnormal noises and accidents caused by wear and tear of the cooling pipe. There was a question about the danger of

A gap between the cooling pipe insertion hole of the baffle plate and the cooling pipe is necessary for workability in assembling the heat exchanger.

The object of the present invention is to solve the above problem without changing the gap or workability.

[Means to solve the problem]

The above purpose is to create a tube nest in which baffle plates, which have been machined in advance to make the cooling pipe insertion holes eccentric to the finished assembly dimensions, are arranged alternately, and the cooling pipes are wrapped around the body by using baffle plates that are straightened from the outer periphery toward the center during welding. In contrast, pressing is achieved by applying force and being able to fix.

[Effect]

When assembling the Teupnest, there is no problem because the gap between the cooling pipe insertion hole of the baffle plate and the cooling pipe is set to a certain depth according to the prior art level according to workability. In addition, during welding work when winding the body plate around the chave nest, the outer periphery of the baffle plate y is pushed toward the center by the body plate and straightened into a 2L cylindrical shape. This can prevent vibration of the cooling pipe due to the gap between the cooling pipe insertion hole of the baffle plate and the cooling pipe, which is the case in the prior art.

[Example] An example of the present invention will be described below with reference to FIGS. 1 and 2.

Figure 1 shows a cross section of the shell-and-tube heat exchanger of the present invention, and Figure 2 shows a detailed view of the baffle plate 1.

In FIG. 1, baffle plates 1 are arranged alternately in a direction perpendicular to cooling pipes 2, and both ends of the cooling pipes are fixed by tube plates 4 to form a teave nest. A water side thermal section is formed by wrapping and attaching a body plate 3 around the outer periphery, and long side covers 5 and 6 are attached to both ends of the tube plate to form a refrigerant chamber.

In Fig. 2, the baffle plates are arranged in the upper part (a) and the lower part (b) with respect to the center of the heat exchanger, as shown in Fig. It is machined to be eccentric by the α dimension.

Next, the heat exchanger of the present invention will be explained based on the assembly order.
As shown in Fig. 1, the baffle plate 1 is placed at the top (
A) and the lower part (b) are fixed at predetermined positions, and a tube plate 4 is fixed to both sides. Moreover, the centers of the cooling pipe insertion holes on the baffle plate and the signboard are all aligned. Next, insert all the cooling pipes 2 to form a TV nest, wrap the body plate 3 around its outer periphery, and perform butt welding of the body plate and welding to the signboard. A pressing force is applied toward the center to hold down and fix the cooling pipe. The cooling pipe and the signboard are fixed by pipe expansion or brazing, and finally, the side covers 5 and 6 of the refrigerant chamber are attached by bolting or welding.

As described above, according to the present invention, it is possible to insert the cooling pipe during assembly work as in the conventional case, and at the same time, it is possible to securely fix the cooling pipe and the baffle plate at the time of completion.

〔Effect of the invention〕

According to the present invention, since the fixation between the cooling pipe and the baffle plate can be further strengthened, vibrations and abnormal noises of the cooling pipe can be prevented.
It has the effect of preventing the occurrence of cracks, etc.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a 7-hole and tube heat exchanger according to an embodiment of the present invention, and Fig. 2 (a), Φ) is a detailed view of the baffle plate used in this.・Baffle plate 2...Cooling pipe 3...Body plate 4
...Tube plate 5,6...Side cover.

Claims (1)

[Claims] In a shell-and-tube heat exchanger that uses multiple baffle plates, we create a tube nest in which baffle plates machined with eccentric cooling tube insertion holes are arranged alternately, and the body plates are wrapped and welded. A shell-and-tube heat exchanger with stronger fixation of cooling pipes and baffle plates.