JPH05149690A - Heat exchanger - Google Patents

Abstract

PURPOSE:To improve a heat exchanging efficiency by a method wherein a clearance between an outer circumferential part of a baffle plate and an inner circumferential surface of a shell is positively sealed without making any complex manufacturing step. CONSTITUTION:Belt-like members 10 of shape memory alloy not abutting against an inner circumferential surface of a shell 1 until they are heated or cooled to a predetermined temperature, deformed into a predetermined shape stored as they are heated or cooled to the predetermined temperature, abutted against the inner circumferential surface of the shell 1 and sealing a clearance between the baffle plate 3 and the shell 1 are fixed to a circumferential part of the baffle plate 3 arranged within the cylindrical shell 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for exchanging heat energy between two fluids having different heat energy.

[0002]

2. Description of the Related Art For example, a multi-tube heat exchanger as shown in FIG. 6 is widely used as a heat exchanger for exchanging heat between two liquids having different temperatures. This heat exchanger has a plurality of U-shaped heat transfer tubes 32 in a cylindrical shell 31.
Is held and fixed by the fixed tube plate 38,
It is formed by arranging a disc-shaped baffle plate (radial baffle plate) 33 in the shell 31 at a predetermined interval at a substantially right angle to the axial direction of the heat transfer tube 32. The baffle plate 33 controls the flow of the shell-side fluid, and a part of the baffle plate 33 serves as a notch 33 serving as a passage port for the shell-side fluid.
a is formed.

In this conventional heat exchanger, the fluid supplied from the shell side inlet nozzle 34 into the shell 31 is
Through the passage opening 39 formed between the notch 33a of each baffle plate 33 and the shell 31, it flows in the shell 31 in the flow path as shown in FIG.
The shell side fluid is discharged from the shell side outlet nozzle 36 and the heat transfer tube side fluid is discharged from the partition chamber outlet nozzle 37 by efficiently exchanging heat with the fluid supplied to No. 2 via the heat transfer tube 32.

[0004]

However, in the above conventional heat exchanger, a gap (for example, 5 mm to 5 mm) is formed between the inner peripheral surface of the shell 31 and the outer peripheral portion of the baffle plate 33 due to reasons such as processing accuracy. 20 mm) G is formed (FIG. 7), and the shell-side liquid passes (short-circuits) through this gap G, so that there is a problem that the heat exchange efficiency decreases.

Further, even if the outer peripheral portion of the baffle plate 33 is brought into close contact with the inner peripheral surface of the shell 31 by improving the processing accuracy, it is extremely difficult to insert the baffle plate 33 into the shell 31 and the workability is also improved. Since it deteriorates, it is practically impossible to completely eliminate the gap between the outer peripheral portion of the baffle plate 33 and the inner peripheral surface of the shell 31 by this method.

The present invention solves the above problems, and it is possible to reliably seal the gap between the outer peripheral portion of the baffle plate and the inner peripheral surface of the shell without complicating the manufacturing process. An object is to provide a heat exchanger having high heat exchange efficiency.

[0007]

In order to achieve the above object, a heat exchanger of the present invention accommodates a plurality of heat transfer tubes in a cylindrical shell and partitions the inside of the shell to control the fluid on the shell side. In a heat exchanger provided with a baffle plate for controlling the flow, the peripheral portion of the baffle plate does not come into contact with the inner peripheral surface of the shell until it is heated or cooled to a predetermined temperature, and is heated or cooled to a predetermined temperature. Then, a band-shaped member made of a shape memory alloy is attached, which is deformed into a predetermined shape to be memorized, contacts the inner peripheral surface of the shell, and seals the gap between the baffle plate and the shell.

Further, the baffle plate is arranged in the shell at a predetermined interval at a right angle to the axis of the heat transfer tube to partition the shell in the radial direction. The notch serves as a passage port for the fluid on the shell side. Is a longitudinal baffle for partitioning the radial baffle and / or the shell in the longitudinal direction.

[0009]

In the heat exchanger of the present invention, the band-shaped member attached to the peripheral portion of the baffle plate is deformed into a predetermined shape memorized by the temperature of the fluid on the shell side, and the outer peripheral portion of the baffle plate and the inner peripheral surface of the shell. By sealing the gap between and, the shell-side fluid is prevented from leaking (short-circuiting) from the gap, and the shell-side fluid is passed through a predetermined flow path to improve the heat exchange efficiency.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The overall structure of the heat exchanger according to this embodiment is the same as that of the heat exchanger of FIG. 6 used in the description of the conventional example, and therefore the description thereof is omitted here. explain in detail.

FIG. 1 is a sectional view showing the internal structure of a heat exchanger according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the essential parts thereof. As shown in FIGS. 1 and 2, in the heat exchanger of this embodiment, the passage of the shell side fluid, which is disposed in the shell 1 at a predetermined interval and substantially at right angles to the axis of the heat transfer tube 2, The baffle plate (radial baffle plate) 3 having the notch 3a serving as the mouth 9 has a predetermined shape that is memorized when a predetermined temperature (for example, 70 ° C.) is reached around the entire circumference except the portion where the notch 3a is formed. A band-shaped member 10 made of a shape memory alloy that deforms is attached. The band-shaped member 10 made of this shape memory alloy does not come into contact with the inner peripheral surface of the shell 1 until it is heated to a predetermined temperature (70 ° C.), and a predetermined memory that is remembered when heated to a predetermined temperature (70 ° C.) is stored. It is formed into a shape that deforms into a shape and contacts the shell 1 to seal the gap G between the baffle plate 3 and the shell 1. In the heat exchanger of this embodiment, the strip member 10 is attached to the baffle plate 3 by spot welding.

When heat is exchanged between two fluids using the heat exchanger constructed as described above, the fluid (shell fluid) supplied from the shell inlet nozzle (not shown) into the shell 1 Flow through a passage opening 9 formed between the notch 3 a of each baffle plate 3 and the shell 1. At this time, when the temperature of the strip-shaped member 10 made of the shape memory alloy attached to the baffle plate 3 reaches a predetermined temperature (70 ° C.) or higher, the strip-shaped member 10 is deformed into a predetermined stored shape and the shell 1 Abut the inner peripheral surface (Fig. 2). Therefore, the gap (G (FIG. 2) = about 15 mm) between the baffle plate 3 and the inner peripheral surface of the shell 1 is sealed by the band-shaped member 10, and the shell-side fluid flows from the gap between the baffle plate 3 and the inner peripheral surface of the shell 1. Leakage (short circuit) is reliably prevented. as a result,
The fluid on the shell side passes through the inside of the shell through a predetermined flow path as shown in FIG. 3, and high heat exchange efficiency is realized.

Further, since the strip-shaped member 10 has a shape that does not come into contact with the shell 1 until it is heated or cooled to a predetermined temperature, the strip-shaped member 10 contacts the shell 1 in the manufacturing process (assembly process). It is possible to manufacture a heat exchanger having excellent heat exchange efficiency without coming into contact with each other and making the assembling work difficult and without particularly lowering the workability of the assembling process.

FIG. 4 is a sectional view showing a heat exchanger according to another embodiment of the present invention. As shown in the schematic configuration of FIG. 5, the heat exchanger of this embodiment partitions the shell 11 in the longitudinal direction by a longitudinal baffle plate 14 and, in the upper and lower two chambers partitioned by the longitudinal baffle plate 14, the shell side A baffle plate (radial baffle plate) 13 having a notch that serves as a fluid passage is provided at predetermined intervals.
It is formed by arranging it substantially at right angles to the axis.

Then, a band-shaped member made of a shape memory alloy is attached to the peripheral portions of the longitudinal baffle plate 14 and the radial baffle plate 13 by spot welding so as to be deformed into a predetermined shape which is memorized at a predetermined temperature (for example, 70 ° C.). Has been.
FIG. 4 shows a state in which the belt-shaped member 20 is attached to the longitudinal baffle plate 14. Although not particularly shown, the manner of attaching the belt-shaped member to the radial baffle plate is the same as that of the heat exchanger (FIGS. 1 and 2) of the above-described embodiment.

In the heat exchanger constructed as described above, the shell 11 is reliably divided in the longitudinal direction by the longitudinal baffle plate 14 to which the strip-shaped member 20 made of a shape memory alloy is attached, and the strip-shaped member (not shown). The shell-side fluid is reliably controlled by the baffle plate 13 to which the () is attached and flows through a predetermined flow path, so that the heat exchange between the shell-side fluid and the heat transfer tube-side fluid is more efficiently performed. It will be possible to do. Further, regarding the simplification of the manufacturing process, the same effect as that of the heat exchanger of the above-mentioned embodiment can be obtained.

In each of the above embodiments, the strip-shaped members 10 and 20 are used.
Baffle with spot welding method (radial baffle)
Although the case of attaching to 3, 3 and the longitudinal baffle plate 14 has been described, the attaching method is not particularly limited, and it is also possible to attach using a method other than spot welding, such as welding or screwing.

Further, in the heat exchanger of the present invention, there is no particular restriction on the specific shape of the strip-shaped member, and the strip-shaped member does not come into contact with the inner peripheral surface of the shell in the manufacturing process, and is predetermined by the temperature of the shell-side fluid during use. It can be formed into various shapes that can be deformed into the shape of (3) and come into contact with the inner peripheral surface of the shell to seal the gap with the baffle plate.

Further, in the above embodiment, the so-called U-shaped tube heat exchanger having the U-shaped heat transfer tube has been described, but the present invention is not limited to this, and a fixed tube plate type, a floating head type, etc. Can also be applied to various types of heat exchangers.

It is to be noted that a two-way shape memory alloy which is deformed into a predetermined shape and is then deformed into a predetermined shape again when the supply of the heat exchange fluid is stopped and the temperature changes (decreases or rises). By using it, it is possible to configure so that disassembly and reassembly can be easily performed.

[0021]

As described above, the heat exchanger of the present invention is
The inner peripheral surface of the baffle does not come into contact with the inner peripheral surface of the shell until it is heated or cooled to a predetermined temperature, and when it is heated or cooled to a predetermined temperature it deforms into a predetermined shape that it remembers. Since a strip-shaped member made of a shape memory alloy that abuts the surface and seals the gap between the baffle plate and the shell is attached, the gap between the baffle plate and the shell can be prevented by the strip-shaped member without complicating the manufacturing process. The shell side fluid is prevented from being short-circuited through the gap between the two and the shell side fluid is allowed to pass through the inside of the shell through a predetermined flow path, so that high heat exchange efficiency can be realized.

Furthermore, since the partitioning effect of the baffle plate is large and a partitioning effect similar to that when completely partitioned is obtained,
The pressure loss of the fluid supplied to the shell, the film heat transfer coefficient, etc. can be calculated relatively accurately, and a reliable design can be performed without waste.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view showing a main part of the sectional view of FIG.

FIG. 3 is a diagram showing a flow state of shell side fluid of the heat exchanger according to the embodiment of the present invention.

FIG. 4 is a sectional view showing a heat exchanger according to another embodiment of the present invention.

FIG. 5 is a diagram showing a schematic configuration of a heat exchanger according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a conventional heat exchanger.

FIG. 7 is an enlarged sectional view showing a main part of a conventional heat exchanger.

[Explanation of symbols]

 1, 11 Shell 2, 12 Heat transfer tube 3, 13 (radial direction) Baffle plate 3 a Notch 14 Long-term baffle plate 10, 20 Band-shaped member

Claims (2)

[Claims] 1. A heat exchanger in which a plurality of heat transfer tubes are housed in a tubular shell, and a baffle plate for partitioning the inside of the shell to control the flow of shell-side fluid is provided in the heat exchanger. Does not come into contact with the inner peripheral surface of the shell until it is heated or cooled to a predetermined temperature, but when it is heated or cooled to a predetermined temperature, it deforms into a predetermined shape that it remembers and comes into contact with the inner peripheral surface of the shell. A heat exchanger having a band-shaped member made of a shape memory alloy for sealing a gap between the baffle plate and the shell. 2. A notch serving as a passage for a fluid on the shell side, in which the baffle plate is arranged in the shell at a predetermined interval at substantially right angles to the axis of the heat transfer tube to partition the shell in the radial direction. The heat exchanger according to claim 1, wherein the heat exchanger is a radial baffle and / or a longitudinal baffle that partitions the shell in a longitudinal direction.