JPH0665775U - Plate fin heat exchanger - Google Patents

Abstract

(57) [Summary] [Objective] The object of the present invention is to provide a plate fin heat exchanger capable of preventing cracks in the mounting portion of the header and the core portion in advance and easily repairing the cracks even if they occur. It is a thing. According to the present invention, fins 4 and separate plates 5 are alternately laminated to form a core portion 1, and headers 2a, 2 for inflowing or exhausting a low temperature fluid and a high temperature fluid into the core portion 1 are provided.
In the plate fin heat exchanger to which b, 3a and 3b are attached, the headers 2a, 2b, 3a and 3b are attached to the core portion 1 with the joint plate 12 interposed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a plate fin heat exchanger widely used in petroleum, chemical and energy related industries.

[0002]

[Prior art]

 A typical plate fin heat exchanger as one of the heat exchangers is, as shown in FIGS. 3 and 4, an inlet 6a and an outlet 6b for a low temperature fluid and an inlet 7a and an outlet for a high temperature fluid of the core portion 1 for heat exchange. 7b is provided with headers 3a, 3b, 2a and 2b, respectively. That is, as shown in FIGS. 4 and 6, the core portion 1 has fins 4 and separate plates 5 alternately stacked to form a low temperature fluid passage 6 through which a low temperature fluid such as combustion air flows in a direct current, and a combustion gas. The high-temperature fluid passages in which high-temperature fluids such as S flow in an alternating manner are alternately formed, and the heat of the high-temperature fluids flowing in the high-temperature fluid passages 7 is passed through the low-temperature fluid passages 6 through the fins 4 and the separate plate 5 to the low-temperature fluid side It is designed to be transferred to and exchange heat.

Further, as shown in FIGS. 5 and 6, when the headers 2 a, 2 b, 3 a and 3 c are attached to the core portion 1, respectively, side plates 8 forming the outer shell of the core portion 1 and the core portion 1 The welded portions 11 provided on the side bars 9 provided at the end portions of No. 1 are respectively welded to be integrally connected.

[0004]

[Problems to be solved by the device]

 By the way, as shown in FIG. 6, since the fins 4, the side plates 8 and the side bars 9 are brazed together by using the brazing material 10, the side bars 9 are particularly joined as shown in FIG. When the welded portion 11 and the headers 2a to 3c are welded, the brazing filler metal 10 is melted by the welding heat, and boron or silicon of the 10 components of the brazing filler metal is deposited as inclusions in the padding portion 11, Later, thermal stress may cause cracks in the core portion 1 and the headers 2a to 3c near the mounting portion. In this case, the headers 2a to 3c have to be removed again to repair the cracked place, but cracks may occur again after repairing.

Therefore, the present invention has been devised to effectively solve this problem, and the purpose thereof is to prevent cracks in the attachment portion of the header and the core portion from occurring and to cause cracks. It provides a plate fin heat exchanger that can be easily repaired.

[0006]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION The present invention for solving the above problems is a plate fin heat mounting method in which fins and separate plates are alternately stacked to form a core portion, and a header for inflowing or discharging a low temperature fluid and a high temperature fluid is attached to the core portion. In the exchanger, the above header is attached to the core part with a joint plate interposed.

[0007]

[Action]

 Since the present invention is configured as described above, the welding heat at the time of attaching the header is not directly transmitted to the core portion, so that the brazing material forming the core portion does not melt out. Therefore, it is possible to prevent cracks that are likely to occur in the attachment portion of the core portion and the header. Further, even if the core portion is cracked when the joint plate is attached to the core portion, the repair can be easily performed because the header is not attached yet.

[0008]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 denotes a core portion for alternately exchanging a high temperature fluid such as combustion exhaust gas and a low temperature fluid such as combustion air for heat exchange, and 3b is attached to an outlet 6b of the low temperature fluid and collects the low temperature fluid after the heat exchange. The low temperature fluid discharge header 2b for exhausting the high temperature fluid is a high temperature fluid discharge header which is attached to the outlet 7b for the high temperature fluid and collects and discharges the high temperature fluid after heat exchange.

As described above, the core portion 1 is formed by alternately stacking the low temperature fluid passages 6 including the fins 4 and the separate plates 5 and the high temperature fluid passages 7 shown in FIGS. It is surrounded by the plate 8, and its configuration is similar to the conventional one. Similarly to the conventional one, the low temperature fluid discharge header 3b and the high temperature fluid discharge header 2b are connected to exhaust pipes 2d and 3d at the upper ends of casings 2c and 3c which are kamaboko-shaped in order to collect the fluid discharged from the core portion 1. It will be done.

Further, as shown in FIG. 1, the low temperature fluid discharge header 3b and the high temperature fluid discharge header 2b are attached to a low temperature fluid outlet 6b and a high temperature fluid outlet 7b, respectively, via a joint plate 12. . As shown in the figure, the joint plate 12 is a rectangular frame body having opening areas similar to those of the low temperature fluid discharge header 3b and the high temperature fluid discharge header 2b, and the low temperature fluid outlet 6b and the high temperature fluid outlet 7b. Has become.

Next, a method of attaching the joint plate 12 will be described.

When the low temperature fluid discharge header 3b is attached to the low temperature fluid outlet 6b, first, the padding portion is formed on the side bar 9 located at the boundary between the low temperature fluid outlet 6b and the high temperature fluid outlet 7b. 11 is applied to form the base for welding. Next, a joint plate 12 is applied to the cryogenic fluid outlet 6b, and the joint plate 12 is connected to the end portion of the side plate 8 forming the outer shell of the core portion 1 and the padding portion 11 by welding. To do. After that, it is confirmed whether the low temperature fluid outlet 6b and the joint plate 12 are welded well. At this time, as described above, due to the melting of the brazing filler metal due to the welding heat or the thermal stress, the core portion 1 or the welded portion is If a crack occurs in the, the cracked part will be repaired.

When the repair is completed, the low temperature fluid discharge header 3b is welded and connected to the upper end portion of the joint plate 12, as shown in FIG. Since the joint plate 12 and the low temperature fluid discharge header 3b are welded at a position separated from the core portion 1 by the height of the joint plate 12, a large thermal stress is applied to the core portion 1 due to welding heat. There is no risk of the brazing filler metal penetrating into this welded part, and there is no adverse effect. Therefore, the joint plate 12 and the low temperature fluid discharge header 3b can be welded easily and reliably. Further, by similarly connecting the hot fluid outlet 7b and the hot fluid discharge header 2b through the joint plate 12, the welding can be performed easily and surely.

In this embodiment, the low temperature fluid discharge header 3b, the low temperature fluid outlet 6b, the high temperature fluid discharge header 2b, and the high temperature fluid outlet 7b have been described as an example. It goes without saying that the introduction header 2a and the high temperature fluid inlet 7a and the low temperature fluid introduction header 3a and the low temperature fluid inlet 6a can be connected to each other through the connecting plate 12 in the same manner as described above to achieve the same effect.

[0016]

[Effect of device]

 In short, according to the present invention, since the header is attached to the core portion for heat exchange via the joint plate, cracking of the core portion and the welded portion can be prevented in advance, and further, cracking can be prevented. Even in the case of occurrence of heat, the repair and reliable welding work can be easily achieved, and the reliability of the heat exchanger itself is improved, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a portion A in FIG.

FIG. 3 is an external perspective view showing an example of a conventional plate fin heat exchanger.

FIG. 4 is a side view showing a low temperature fluid passage (A) and a high temperature fluid passage (B) of a conventional plate fin heat exchanger.

FIG. 5 is a partial perspective view showing the vicinity of a header mounting portion of a conventional plate fin heat exchanger.

6 is an enlarged plan view of a portion A in FIG.

FIG. 7 is an enlarged perspective view of a portion A in FIG.

[Explanation of symbols]

 1 core part 2a, 2b, 3a, 3b header 4 fins 5 separate plate 12 joint plate

Claims (1)

[Scope of utility model registration request] 1. A plate fin heat exchanger in which fins and separate plates are alternately laminated to form a core part, and a header for inflowing or discharging a low temperature fluid and a high temperature fluid is attached to the core part. A plate fin heat exchanger characterized by being attached to a core portion with a joint plate interposed.