JPH0534084A - Heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a heat exchanger, having a new structure capable of coping with the difference of thermal expansions between a heat transfer tube and a circular cylinder without employing any expansion joint, U-shaped heat transfer tube or a loose head, which have some troubles, and easy in the cleaning of the heat transfer tubes and the circular cylinder. CONSTITUTION:One end of a heat transfer tube 5 is communicated with a high-temperature fluid chamber 1 and the other end of the same is provided with a heat transfer tube header 9 having a guide 10 while one end 6 of the circular cylinder 13, receiving the heat transfer tubes 5, is provided in the high- temperature fluid chamber 1. The other ends 8 of the heat transfer tubes are connected movably and air-tightly to the guide 10 through O-rings.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger widely used in chemical plants and the like. More specifically, it relates to a multi-tube cylindrical heat exchanger.

[0002]

2. Description of the Related Art Conventionally, as a multi-tubular cylindrical heat exchanger, FIG.
~ Various types as shown in Fig. 5 are used. Figure 3
The one shown in Fig. 6 is called a fixed tube plate type, and in the figure, a is a cylindrical body, inside which a heat transfer tube b is provided,
The heat transfer tube b is communicated with the high temperature fluid chambers c and d provided at both ends of the cylindrical body a. One of the high temperature fluid chambers c is provided with a partition plate, f is a high temperature fluid inlet, g is the same outlet,
h is the inlet of the cryogenic fluid, i is the outlet, and j is the baffle.
Further, k is a fixed frame. An expansion joint l is provided on the cylindrical body a. The hot fluid enters through its inlet f,
It passes through the heat transfer tube b in the upper part of the cylindrical body a, then reaches the heat transfer tube b in the lower part, is discharged from the outlet g, and heats the low temperature fluid in the cylindrical body a during that time. If the difference in thermal expansion between the heat transfer tube b and the cylindrical body a is large during operation of the device thus formed, the expansion joint 1 expands and contracts and the difference is automatically adjusted. Next, the device shown in FIG. 4 is a U-shaped tube heat exchanger, and the heat transfer tube b is formed in a U shape as shown in the drawing. Since it is fixed at the part, there is no problem even if there is a difference in thermal expansion between both a and b. The device shown in FIG. 5 is called a floating cylinder type, and is formed so that a floating head m corresponding to a high-temperature fluid chamber provided on one side of the heat transfer tube b can move freely with respect to the cylindrical barrel a. This makes it possible to cope with the difference in thermal expansion between the heat transfer tube b and the cylindrical movement a.

[0003]

However, each of the above-mentioned conventional devices has the following drawbacks. That is, FIG.
The device shown in (1) must be provided with the expansion joint (1), which is troublesome to manufacture. In addition, the scale accumulates at the location of this expansion joint l, and expansion and contraction becomes gradually impossible. In addition, the scale causes corrosion. Moreover, cleaning of the cylinder body is difficult except by a chemical method. Further, in the device shown in FIG. 4, the U-shaped portion is formed in the heat transfer tube b, so that the U-shaped portion is often worn and corroded. In addition, the manufacturing cost of the U-shaped heat transfer tube b is inevitable because the manufacturing cost is high.

Further, the apparatus shown in FIG. 5 has a risk of leakage from a portion of the flange n inside the barrel of the idler head m. In addition, the structure is complicated and the manufacturing cost is high. The present invention has been made in order to solve such various problems, and its purpose is to omit the expansion joint l, so that the scale can be prevented from accumulating in that portion, and the cylindrical body a can be easily cleaned. In addition, the heat transfer tube b need not be formed with a U-shaped portion, and therefore there is no fear of wear, and the idler head m need not be formed, which is easy to clean and the manufacturing cost is high. It is to provide a heat exchanger that does not exist.

[0005]

The present invention which achieves the above object will be described in which one end of a plurality of heat transfer tubes is connected to a high temperature fluid chamber which is partitioned by a partition plate and has an inlet and an outlet for the high temperature fluid. The heat transfer tube has a second end connected to a heat transfer tube header having a guide, and a cylindrical cylinder for accommodating the heat transfer tube and having a low temperature fluid inlet and a low temperature fluid outlet is provided. The heat exchanger is characterized in that the chamber side end is connected to the same fluid chamber, and the other end is provided in an airtight and movable manner on the guide via an O-ring.

[0006]

The high temperature fluid is caused to flow into the high temperature fluid chamber, and the low temperature fluid is supplied from the low temperature fluid inlet of the cylindrical body. Then, heat exchange is performed on the tube wall of the heat transfer tube, and the cryogenic fluid is heated. When a difference in thermal expansion occurs between the heat transfer tube and the cylinder body, one end of the cylinder body is provided in the guide of the heat transfer tube header via an O-ring in an airtight and movable manner. The O-ring portion moves relatively in an airtight state, and therefore both the heat transfer tube and the cylindrical body are not restrained, so that problems due to expansion do not occur. Therefore, the expansion joints l and U-shaped as described in the above-mentioned conventional example are not generated. Shaped heat transfer tube B,
The floating cylinder m and the like can be omitted.
Therefore, the production cost is not expensive. Then, the entire heat transfer tube can be taken out from the inside of the cylindrical body, and the outer surface of the heat transfer tube can be easily cleaned. Also, since the inner surface has no bend portion, it can be easily cleaned. Also, the inner surface of the cylindrical body can be easily cleaned.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is a high temperature fluid chamber having a partition plate 2 and provided with an inlet 3 and an outlet 4 for the high temperature fluid. Reference numeral 5 denotes a plurality of heat transfer tubes, one end 6 of which is opened to the high temperature fluid chamber 1 and the other end 8 of which is connected to a heat transfer tube header 9. Same header 9
Has a cylindrical guide 10 and a fluid chamber 11 as shown,
The lid 12 is formed so as to be openable and closable. Next, 13 is a cylindrical body, which has the heat transfer tube 5 built-in, one end portion 14 is provided in the high temperature fluid chamber 1, and the other end portion 15 is an O ring
To the tubular guide 10 of the heat transfer tube header 9 via 6,
It is airtight and movable. Reference numeral 17 is an inlet of the low temperature fluid, 18 is an outlet thereof, 19 is a flange, and 20 is an opening / closing lid. 21 is a base. The details of the portion provided with the O-ring 16 are shown in FIG. In the figure, reference numeral 22 is a holding member, which is the other end portion 1 of the cylindrical body 13.
5 is fixed by bolts 23 to the concave O-ring 16
The holding portion 24 of the O-ring 1 is formed on the holding portion 24.
6 are accommodated. 25 is a stopper. The O-ring 16 is formed of an elastic body such as rubber, heat resistant rubber, polyurethane, or other appropriate synthetic resin.

The operation of the heat exchanger of this embodiment is substantially the same as the operation of the present invention described above, and therefore will be omitted. However, when cleaning this heat exchanger, the opening / closing lid 20, the lid body 12 and the like are removed. Further, since the O-ring 16 is housed in the groove-shaped holding portion 24, it operates stably.

[0008]

The heat exchanger of the present invention is constructed as described above, one end of the cylindrical body is provided in the high temperature fluid chamber, and the other end is hermetically sealed to the guide of the heat transfer tube header via the O-ring. Since it is provided movably and freely, it is possible to omit all the expansion joints, U-shaped heat transfer tubes, floating heads, etc. as shown in the above-mentioned conventional example, and the scale accumulation that occurs in the expansion joints It is possible to solve all the problems such as malfunction, corrosion caused by scale accumulation, wear and corrosion of the U-shaped heat transfer tube, and leakage from the flange portion of the floating head. Moreover, the manufacturing cost can be made relatively low because the structure is simple and not a complicated structure as in various conventional examples. Further, at the time of cleaning, the entire heat transfer tube can be pulled out from the cylindrical body at the portion of the O-ring, so that the outside of the heat transfer tube and the inside of the cylindrical body can be easily cleaned. Also, the inside of the heat transfer tube can be easily cleaned by eliminating the U-shaped portion and the like of the conventional example. As yet another effect, the difference in thermal expansion between the cylindrical barrel and the heat transfer tube can be accurately known by looking at the length of the heat transfer tube header that extends outside the O-ring.

[Brief description of drawings]

FIG. 1 is a sectional view of a heat exchanger showing an embodiment of the present invention.

FIG. 2 is an enlarged detailed view of the portion shown in FIG. 1, showing an embodiment of the present invention.

FIG. 3 is a sectional view of a conventional heat exchanger.

FIG. 4 is a cross-sectional view of a conventional heat exchanger different from that shown in FIG.

5 is a cross-sectional view of a conventional heat exchanger different from that shown in FIGS. 3 and 4. FIG.

[Explanation of symbols]

 1 High Temperature Fluid Chamber 2 Partition Plate 3 High Temperature Fluid Inlet 4 High Temperature Fluid Outlet 5 Heat Transfer Tube 6 One End 7 Opening 8 Other End 9 Heat Transfer Tube Header 10 Guide 13 Cylindrical Body 14 One End 15 Other End

Claims (1)

Claim: What is claimed is: 1. A high temperature fluid chamber, which is partitioned by a partition plate and has an inlet and an outlet for the high temperature fluid, is provided with one end of a plurality of heat transfer tubes in communication with the other end of the heat transfer tube. A heat transfer tube header having a guide is connected to the heat transfer tube, and a cylindrical cylinder having the heat transfer tube and having an inlet and an outlet for the low temperature fluid is provided, and the end of the cylindrical cylinder on the high temperature fluid chamber side is connected to the fluid chamber. The heat exchanger is characterized in that the other end is airtightly and movably provided on the guide through an O-ring.