JPS59225299A - Heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a heat exchanger of small size and of high heat exchanging efficiency, by preventing the U-shaped bend parts of heat transfer pipes from breakage by vibration, by shortening the whole length of a heat exchanger, by utilizing a gap between the inner diameter of a shell and the maximum height of heat transfer pipes, and by providing a guide plate in the gap under the last baffle which supports all the number of U-shaped bend parts of heat transfer pipes, and by providing a branched pipe on the side of an end plate to the side of a water chamber. CONSTITUTION:In a heat exchanger of U-pipe type, heat is exchanged between a fluid (a) fed from the inlet branched pipe 8 of a water chamber 3 and a fluid (b) fed from the branched pipe 6 on the side of tube plate of a shell 2. A buffer plate 11 is provided under the branch pipe 6 in the shell body 2, so that the heat transfer pipes 1 are not vibrated by the shock of fed fluid (b) which is directly hit at the pipes 1 when the fluid is fed into the shell body 2. By providing the buffer plate 11 in the shell, the pipes 1 are not able to be arranged in all part of a shell, inside of the inner diameter D1, and a gap (h) which is the same height as of the plate 11 is produced. Utilizing the gap (h) a guide plate 13 is provided to the branched pipe 7 on the side of an end plate in the shell body 2, providing the branched pipe 7 to the side of a water chamber 3, so that the whole length of a heat exchanger is shortened. A baffle 5 supports all the pipes 1, while the last baffle 12 is provided to prevent the pipes 1 from being oscillated. The baffle 12 is cut out in order to flow a fluid (b) through the U-shaped bend parts of heat transfer pipes.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a multi-tubular cylindrical U-tube heat exchanger.

[Background of the invention]

A conventional technique will be explained with reference to FIGS. 1, 2, and 3.

- The conventional U-tube heat exchanger, as shown in Fig. 1, has fluid a flowing in from the ice chamber inlet nozzle 8 provided in the water chamber 3 and a tube plate side nozzle 6 provided on the body 2. This is to exchange heat with the inflowing fluid.

At this time, the heat exchanger tube 1 is bent like a U section in order to return the fluid a that has flowed into the water chamber 3 to the water chamber 3 again.

The fluid on the body 2 side passes through the tube plate side nozzle 6 and the buffer plate 11, and flows between the evenly arranged buckles 5, during which time it comes into contact with the outer surface of the heat transfer tube 1 to perform a predetermined heat exchange. However, the fluid flows into the U section of the U-shaped tube before flowing out from the end plate side nozzle 7, so if the developed dimension t of the U-shaped tube U section is long, the natural frequency of the heat exchanger tube itself becomes small. There was a drawback that the heat exchanger tube 1 caused resonance, leading to damage to the heat exchanger tube 1.

In addition, as shown in Figure 3, the mirror side exit tube holder 7 attachment part and the body 2
and the distance between the fuselage mirror plate 4 attachment part 1. must be separated by at least 5 times the body thickness t or 100wn or more according to the law.
The overall length of the heat exchanger was long, making it extremely uneconomical.

[Purpose of the invention]

An object of the present invention is to provide a small-sized heat exchanger that prevents vibration from occurring in the U section of a heat exchanger tube, prevents damage to the heat exchanger tube due to vibration, and has a good heat exchange efficiency.

[Summary of the invention]

The present invention utilizes the gap between the inner diameter D1 of the body and the maximum height H of the heat exchanger tubes 1, as shown in FIGS. 4 and 5, as a means to shorten the overall length of the heat exchanger as much as possible. Heat exchanger tube U
A guide plate 13 is provided in the gap below the final cross-section 2 which fully supports the character part so as not to vibrate, and the end plate side nozzle holder 7
The heat exchanger is moved to the water chamber 3 side to shorten the overall length of the heat exchanger.

[Embodiments of the invention]

Examples of the present invention will be explained with reference to FIGS. 4, 5, 6, and 7.

As shown in FIG. 6, the U-shaped tube heat exchanger consists of a fluid a flowing in from an ice chamber inlet nozzle 8 provided in the water chamber 3 and a fluid flowing in from a tube plate side nozzle 6 provided in the body 2. It is a device that exchanges heat.

At this time, the flow force of the fluid flowing into the body 2 from the tube plate side nozzle stub 6 directly hits the heat exchanger tube 1, and the heat exchanger tube 1 vibrates due to the impact force, causing the tube plate side inside the body 2 to vibrate like a woman. Buffer plate 1 at the bottom of nozzle 6
1 will be provided.

As a result, it is no longer possible to arrange the heat exchanger tubes l all over the inside diameter DI of the fuselage, and a gap corresponding to the height of the buffer plate 11 is created.

In the present invention, this gap is utilized, as shown in FIG.

As shown in FIGS. 6 and 7, the head plate side nozzle 7 in the body 2
A guide plate 13 is provided in the heat exchanger section, and the end plate side nozzle holder 7 is moved to the ice chamber 3 side, thereby shortening the overall length of the heat exchanger.

Furthermore, the nokatsuful 5 (see Figure 1) that supports the heat exchanger tubes 1 in the U-shaped portion is made so that it can support all the heat exchanger tubes 1 as shown in Figures 5, 6, and 7. A final groove 12 is provided to prevent the heat exchanger tube 1 in the U-shaped portion from vibrating.

At this time, in order to effectively utilize the heat exchange part of the heat exchanger tube 1 in the U-shaped part, the final tube 12 is cut out as shown in FIG. Let it flow.

According to an embodiment of the present invention, by providing the guide plate 13, the total length of the υ heat exchanger is 5 times the outer diameter d of the head plate side nozzle head, or the outer diameter d of the head plate side nozzle head, or 5 times the body plate thickness t. It can be shortened by 11001Il+1.

Furthermore, by providing the final baffle 12, the fuselage inner diameter DI of approximately 700 mg can be reduced by
The ratio of the unfolded dimension t of the tube portion was approximately 1.5 to 1.9 times in the conventional structure (see Fig. 1), but it is approximately 1.0 to 1.4 times in the present invention. According to formula (1) for determining the natural frequency of the heat exchanger tube itself, the distance between supports ML is inversely proportional to the square of the square, so it is possible to increase the natural frequency of the heat exchanger tube itself. Problems such as damage to the heat exchanger tube 1 due to vibration are eliminated.

Explanation of symbols in formula (1) f... Natural frequency λ of the heat exchanger tube itself...
Frequency coefficient L... Distance between supports (L=lort,) E...
... Coefficient of longitudinal elasticity ■ ... Moment of inertia g ... Gravitational acceleration r ... Weight of unit volume A ... Cross-sectional area [Effects of the invention According to the present invention, by shortening the total length of the heat exchanger, extra space can be created in the building layout.By supporting all the heat exchanger tubes in the U-shaped part with the final baffle, By eliminating the risk of vibration of the heat exchanger tube in the tube section, the structure of the U-tube heat exchanger can be enlarged, and this U-tube heat exchanger can be used for large capacity. This has the effect of allowing the use of exchangers.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram of a conventional U-tube heat exchanger, Fig. 2 is a detailed view of the U-tube section in Fig. 1, and Fig. 3 is a diagram of the end plate side nozzle section in Fig. 1. Detailed view, Figure 4 is a cross-sectional view of the heat exchanger from the center of the nozzle on the tube plate side and a detailed view of the buffer plate, and Figure 5 is a cross-sectional view of the heat exchanger from the center of the nozzle on the head plate side and the main part. FIG. 6 is a structural diagram of the U-tube heat exchanger of the present invention, and FIG. 7 is a detailed view of the guide plate and final baffle of FIG. 6 in an embodiment of the invention. It is a diagram. Figure 5 $4 Figure $5 Figure 6 Figure 7

Claims (1)

[Claims] 1. A heat exchanger characterized in that the heat exchanger tubes are supported by a final baffle for the U-assisted heat tube bundle of the heat exchanger, and a guide plate is provided below the final baffle.