JPH02287097A - Shell and tube type heat exchanger - Google Patents

Abstract

PURPOSE:To strengthen a fixing of a pipe and a plate and reduce a clearance between them by a method wherein two buffle plates having cooling pipe insertions holes eccentric in different directions to each other in respect to a center are overlapped to make a tube nest, a copper plate is wound and welded. CONSTITUTION:Cooling pipe holes are machined such that a buffle plate (a) is eccentric in respect to an upper side and a buffle plate (b) is eccentric in respect to a lower side for a center of a heat exchanger. During assembling operation, the plates (a) and (b) are overlapped to each other while the cooling pipe holes being coincided to each other. Then, all number of cooling pipes 2 are inserted to form a tube nest, a barrel plate 3 is wound around an outer circumference of the tube nest and a butt weld of the barrel plate 3 and a welding with the pipe plate 4 are carried out. At this time, since the cooling pipe holes at the plates (a) and (b) are eccentric to each other, a pushing force is applied as shown by an arrow to enable the cooling pipes to be pushed and fixed to each other. A clearance between the cooling pipe 2 and the plate is reduced. With such an arrangement, it is possible to reduce a vibration of the cooling pipes during the operation and a short-pass of the fluid.

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 and improving performance.

[Conventional technology]

In the conventional technology, as described in Mechanical Engineering Handbook "B Heat Exchangers, Air Conditioning, Refrigeration" New Edition, Page B8-7, the buckle grate is machined with an insertion hole that is somewhat larger than the outer diameter of the cooling pipe. This makes it easier to assemble the heat exchanger. Due to the existence of a gap between this baffle plate insertion hole and the cooling pipe, if the flow rate of fluid flowing through the body meat is excessive, this gap will cause the cooling pipe to vibrate and make abnormal noises, leading to cracking accidents. , and the fact that the performance as a heat exchanger is not fully demonstrated due to the fluid passing through this gap.

[Problem to be solved by the invention J The above-mentioned prior art 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 of the baffle plate and the cooling pipe. There are also problems with abnormal noise and the risk of wear and tear of the cooling pipes.Fic, there is also a problem that the performance as a heat exchanger cannot be fully demonstrated due to the fluid shuttling through this gap. there were.

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 problems]

The above purpose is to create a tube nest using two overlapping baffle plates that have been machined in advance so that the cooling and α insertion holes are eccentric in a different direction from the assembled finished dimensions, and the body plate winding is corrected from the outer periphery toward the center during welding. Due to the buckle grate, pressing against the cooling pipe can be achieved by simply fixing it with a large amount of force. Furthermore, since the baffle plate is sandwiched between the cooling pipes from both sides, the gap between the cooling pipes and the baffle plate holes can be further reduced.

[Effect]

When assembling the Teave Nest, the two buckle grate holes are found to be aligned, and the gap between the cooling pipe insertion hole of the pub full grate and the cooling a is secured at the level of the prior art in terms of workability, so there is no problem. - Also, when the body plate is wrapped around the TV nest, the baffle plate is pushed toward the center by the outer circumferential body plate 71. By straightening it into a circular shape (・'C), it is possible to press it against the cooling pipe at the same time and fix it with less force. It is possible to prevent vibration of the cooling pipe due to the gap between the cooling pipe and the baffle plate.Moreover, the gap between the baffle plate and the baffle plate hole can be made smaller than the gap between the baffle plate and the baffle plate. Therefore, the amount of fluid syrup bath can be reduced, and the performance of the heat exchanger can be improved.

〔Example〕

An embodiment of the present invention will be described above with reference to FIGS. 1, 2, 3, and 4.

Fig. 1 shows a cross section of the shell-and-wave heat exchanger of the present invention, Figs. 2(a) and (b) show detailed views of the baffle plate, and Figs. A cross-sectional view of the full-grate installation state is shown.

Baffle plate 1 (a) (b) in Figure 1 VC
The cooling pipes are arranged alternately in a direction perpendicular to the cooling pipes 2, and the cooling pipes are fixed at both ends by a barbed plate 4 to form a teabench. Water side heat exchange part is formed, pipe plate I1, ii]
4, side covers 5 and 6 are attached to form a colander refrigerant chamber.

In Figure 2 & C, the baffle plate is machined with the cooling/d holes eccentrically placed upwards relative to the center of the heat exchanger (a)
There is also one in which the hole for the cooling pipe is eccentrically located on the lower side with respect to the center of the jA junction (Φ).

Next, the heat exchanger of the present invention will be explained based on the order of construction t-r.As shown in FIG.
, ) and Φ) are fixed in a predetermined position by aligning the cooling holes and overlapping them, and U plates are fixed at both ends. Furthermore, the cooling pipe holes in the pub full grate and the soundboard are all aligned in the center. Next, all the cooling pipes 2 are inserted to form a teacup nest, and the body plate 3 is wrapped around the outer circumference.
Perform butt welding of the shell plate and bath welding to the tube plate. At this time, the pub full plate can be fixed by applying a pressing force 7 to the center as shown by the arrow, and applying cooling force 7 to the center as shown by the arrow.

The cooling pipe and tube plate are fixed by expanding or brazing, and finally the long side covers 5 and 6 of the refrigerant chamber are attached to the holes by bolts or welding. In addition, cooling pipe 2 and baffle plate (a) (
In the sectional view of b) in the installed state, the gap is smaller as shown in Figure 3. In addition, in the cross-sectional view of the mounting state of the cooling pipe and baffle plate of the prior art, the clearance Q11j shown in FIG. 4 is large.

According to the present invention, the cooling pipes can be inserted in the same way as before during the assembly process, and at the same time, the cooling capacity and the baffle plate can be reliably fixed at 1 ml at the time of completion. I can do it. Furthermore, the size of the connection between the cooling 'a and the baffle plate hole can be made smaller [Effect of the Invention] According to the present invention, the fixation between the cooling 'a' and the baffle plate can be further strengthened. It has the effect of preventing the occurrence of vibrations, abnormal noises, cracks, etc. in the cooling pipe. In addition, the gap between the cooling pipe and the pub full grate hole can be made smaller, allowing the fluid to seal a
- There are 7 effects of ``Seikou'' 2 because the amount of heat is reduced.

[Brief explanation of drawings]

Fig. 1 is a -T view of a shell-and-table thermal device according to an embodiment of the present invention, and Fig. 2 (a), υ) is a detailed view of a bubble full plate used in this device. FIGS. 8 and 4 are cross-sectional views before cooling and with the baffle plate installed. 1... Baffle plate 2... Cold u9 3.
...Body plate 4...Tube plate 5.6...Side cover.

Claims (1)

[Claims] 1. In a shell-and-tube heat exchanger using multiple baffle plates, a tube nest is used in which two baffle plates are stacked on top of each other, and the cooling tube insertion holes are eccentrically disposed in different directions relative to the center. A shell-and-tube type with a structure in which the body plate is wrapped and welded to strengthen the fixation between the cooling pipe and baffle plate, while at the same time creating a smaller gap between the cooling pipe and the baffle plate. Heat exchanger.