JPH0953891A - Shell and tube type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shell and tube type heat exchanger capable of being assembled and brazed without any jig, improving its assembling property, efficiently collecting the heat, and inserting a baffle plate to change the water flow direction. SOLUTION: Attention is paid to assembly of a flange 21 to the prescribed position using a spacer 22 and fixing of a pipe 4 by providing a guide plate 23 capable of being fixed to the spacer 22 between the flanges 21, and the spacer 22 arranged in the longitudinal direction of the pipe 4 is provided, the flange 21 is fixed to each end of the spacer 22, and the guide plate 23 having the area smaller than that of the flange is supported by the spacer 22 within a shell 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell-and-tube heat exchanger, and more particularly to a shell-and-tube heat exchanger having improved assemblability and heat exchange rate.

[0002]

2. Description of the Related Art Conventionally, a shell-and-tube type heat exchanger is generally adopted when a reverse Stirling cycle or a Vilmier cycle is applied to a refrigerator having a refrigerating capacity of several kW or more.

FIG. 5 is a plan view of a conventional shell-and-tube heat exchanger 1, and FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5. The shell-and-tube heat exchanger 1 has a cylindrical shape. 2 has a pair of upper and lower disc-shaped flanges 3, and a large number of pipes 4 (capillary tubes, tubes). Both ends of each pipe 4 are fixed between a pair of upper and lower flanges 3 to form a pipe assembly 5, and the pipe assembly 5 is inserted into the shell 2.

FIG. 7 is a cross-sectional view of the shell 2 and the lid member 6. The shell 2 has an inlet 7 for a heat exchange medium such as water.
Further, an O-ring 9 is provided which forms a lead-out port 8 and seals with the flange 3.

The lid member 6 is attached to the shell 2 by the mounting bolt 10.
The space in which the pipe 4 is arranged inside the shell 2 and the flange 3 is fixed to the heat exchange space 1
It is formed as 1.

In the case of a Stirling refrigerator or a Wilmier refrigerator, the working gas is passed through the pipe 4 and the water is passed outside the pipe 4 so that the working gas and the water are exchanged in the heat exchange space 11. Allow heat exchange between.

In such a shell-and-tube heat exchanger 1, it is necessary to braze the pipe assembly 5 in the furnace in order to prevent leakage of the working gas sealed in the pipe 4 at high pressure.

However, the conventional shell-and-tube heat exchanger 1 has the following problems when brazing in the furnace. That is, the shell 2 and the flange 3
Since it is necessary to seal the space between the pair of flanges 3 with the O-ring 9, there is a problem that a jig for accurately matching the distance, parallelism and concentricity between the pair of flanges 3 is required.

Further, since no baffle for changing the flow direction of water is installed in the heat exchange space 11, it is difficult to efficiently recover heat, and it is difficult to dispose the baffle. There is.

Further, since the gap between the group of pipes 4 and the shell 2 is relatively large in the heat exchange space 11, water flows through this gap, and a sufficient amount of water is evenly distributed over the entire group of pipes 4. However, there is a problem that the heat exchange efficiency is low because it is not supplied to the.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a shell-and-tube heat exchanger which can be assembled and brazed without a jig. The task is to do.

Another object of the present invention is to provide a shell-and-tube type heat exchanger capable of efficiently recovering heat.

Another object of the present invention is to provide a shell-and-tube heat exchanger which can be applied to Stirling refrigerators, Wilmier refrigerators, and other refrigerators and has improved assemblability.

Another object of the present invention is to provide a shell-and-tube heat exchanger in which a baffle capable of changing the flow direction of water can be inserted.

[0015]

That is, according to the present invention, a flange is assembled in a predetermined posture by using a spacer,
Focusing on fixing the pipe by providing a guide plate that can be fixed to the spacer between the flanges, the tubular shell, the plate-like flange to be stored in this shell, and both ends of this flange A plurality of pipes having a portion arranged therein, and a shell-and-tube heat exchanger having a space in which the pipe is arranged inside the shell and the flange as a heat exchange space, A shell characterized in that spacers arranged along the length direction are provided, the flanges are fixed to both ends of the spacers, and a guide plate having an area smaller than the funnel radius is supported by the spacers inside the shell. It is an and-tube type heat exchanger.

The flange and the spacer can be positioned by a knock pin.

The guide plate can be inserted into a plate insertion groove formed in the spacer.

If the guide plate preferably has a semicircular or arcuate end portion along an arc of the shell inner wall, the guide plate is arranged with the end portion abutting the shell inner wall. , It can function as a baffle that effectively uses the inside of the shell.

In the shell-and-tube heat exchanger according to the present invention, since the flange can be fixed in a predetermined posture by the spacer, the distance between the pair of flanges, parallelism, and concentricity can be set to desired values. It can be set in advance.

Since the pipe can be fixed to the flange and the guide plate, the pipe assembly does not need a jig for assembling and brazing the pipe assembly, thus improving the assemblability. You can

Since the spacer blocks the flow of water around the pipe group in the heat exchange space, the water can sufficiently pass around the pipes and the heat exchange rate can be improved.

Since the guide plate can be fixed to the plate insertion groove formed in the spacer, the guide plate can be made to function as a baffle plate and the water can be made to flow over almost the entire area of the pipe group, so that water can be evenly distributed. The heat can be supplied, and the heat exchange rate can be further improved.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a shell-and-tube heat exchanger 20 according to an embodiment of the present invention will be described with reference to FIGS.
It will be explained based on the following. However, the same parts as those in FIGS. 5 to 7 are designated by the same reference numerals, and the detailed description thereof will be omitted.
1 is a vertical cross-sectional view of the shell and tube heat exchanger 20, FIG. 2 is a view taken in the direction of arrow II in FIG. 1, and FIG. 3 is III- in FIG.
FIG. 3 is a cross-sectional view taken along line III, in which a shell-and-tube heat exchanger 20 includes a cylindrical shell 2, a pair of upper and lower lid members 6,
A pair of upper and lower flanges 21 corresponding to the flange 3,
It has a pair of left and right spacers 22, a pipe 4, and a guide plate 23.

FIG. 4 is an exploded perspective view of the pipe assembly 24. The pipe assembly 24 is a pair of upper and lower flanges 2.
1, a pair of left and right spacers 22, and a guide plate 23
And the pipe 4 constitute this.

In particular, as shown in FIG. 4, the flange 21
Has an arcuate support base 25 formed to face each other in the diametrical direction, and a hollow pipe fixing portion 26 formed between the support bases 25. A pair of knock pin insertion holes 27 are formed in the arc-shaped support base portion 25, and a large number of pipe insertion holes 28 are formed in the pipe fixing portion 26 in a predetermined arrangement.

The spacer 22 has an arcuate cross-section similar to that of the support base 25, and has a knock pin insertion hole 29 formed similarly to the support base 25. A flange is formed by a pair of upper and lower knock pins 30. 21 and the spacer 22 can be integrally fixed, and the heat exchange space 1 is provided inside thereof.
1 can be formed.

Further, for example, three plate insertion grooves 31 are formed in parallel with each other on the inner wall surface of the flange 21 on the side facing the pipe fixing portion 26 at predetermined intervals, and a pair of left and right spacers 22 are formed. Plate insertion groove 31
The guide plate 23 can be fixed by inserting both side surface portions 23A of the guide plate 23 into the.

The guide plate 23 has a smaller area than the flange 21 (pipe fixing portion 26), one end of which is an arcuate end 23B, and the other end is a linear end 23C. The arcuate end 23B and the straight end 2
The length between 3C and 3C is shorter than the length of the plate insertion groove 31.

Further, as shown in FIG. 1, the arc-shaped end portion 2
3B is brought into contact with the inner wall of the shell and fixed in the plate insertion groove 31 of the spacer 22 so that the positions of the guide plates 23 adjacent to each other in the upper and lower directions in the figure are displaced from each other, and thus the water winds around the pipe 4. (See the phantom line in FIG. 1).

On the surface of the guide plate 23,
A pipe insertion hole 32 is formed at the same position as the pipe insertion hole 28 and at the same position, so that the pipe 4 can be inserted.

In the shell-and-tube heat exchanger 20 having such a structure, the pipe assembly 24 is first assembled. That is, a pair of upper and lower knock pins 30 are inserted into the knock pin insertion hole 27 of the flange 21 and the knock pin insertion hole 29 of the spacer 22 to assemble the pair of upper and lower flanges 21 at a predetermined interval, parallelism, and concentricity.

Between the pair of upper and lower flanges 21 and the pair of left and right spacers 22, the guide plate 23 is inserted and fixed in the plate insertion groove 31 of the spacer 22, and the pipe insertion hole 28 of the flange 21 and the pipe insertion of the guide plate 23 are inserted. The pipe 4 is inserted into the hole 32.

Therefore, the flange 21 and the pipe 4
Via the spacer 22 without the need for a jig
Not only can the flanges 21 be assembled at predetermined intervals, parallelism, and concentricity, but also the relative positions of the pipe 4 and the guide plate 23 can be assembled with desired accuracy, and the assemblability can be improved. .

Next, this pipe assembly 24 is brazed in the furnace, housed in the cylindrical shell 2, and the lid member 6
Shell-and-tube heat exchanger 20 in a state of being covered with
And

In the shell-and-tube heat exchanger 20 thus assembled, the guide plate 23 acts as a baffle plate to cause the water to meander as shown in FIG. 1, so that the heat exchange with the pipe 4 is efficiently performed. be able to. Further, the spacers 22 block the flow of water to the outer peripheral portion of the assembly of the pipes 4 in the heat exchange space 11 and can supply sufficient water to the respective pipes 4, thus further improving the heat exchange efficiency. Can be made.

[0036]

As described above, according to the present invention, the flange is positioned by the spacer and the guide plate is fixed to the spacer at a predetermined position to ensure the meandering of water and the attachment of the pipe. And the heat exchange rate can be improved.

[0037]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a shell-and-tube heat exchanger 20 according to an embodiment of the present invention.

FIG. 2 is a view taken along the arrow II of FIG.

3 is a sectional view taken along line III-III of FIG.

FIG. 4 is an exploded perspective view of the pipe assembly 24 of the same.

FIG. 5 is a plan view of a conventional shell-and-tube heat exchanger 1.

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5;

FIG. 7 is a sectional view of the shell 2 and the lid member 6 of the same.

[Explanation of symbols]

 1 Shell-and-tube heat exchanger (Fig. 5) 2 Cylindrical shell 3 A pair of upper and lower disk-shaped flanges 4 Pipes (fine tubes, tubes) 5 Pipe assembly 6 Lid 7 Water inlet 8 Water outlet 9 O-ring 10 Mounting bolt 11 Heat exchange space 20 Shell and tube heat exchanger (Fig. 1) 21 A pair of upper and lower flanges 22 A pair of left and right spacers 23 Guide plates 23A Both side portions of guide plate 23B Arc-shaped end portions of guide plate 23C Straight end of the guide plate 24 Pipe assembly 25 Arc-shaped support base 26 Recessed pipe fixing portion 27 Knock pin insertion hole 28 Pipe insertion hole 29 Knock pin insertion hole 30 Pair of upper and lower knock pins 31 Plate insertion groove 32 Pipe insertion Hole

Claims (3)

[Claims] 1. A tubular shell, a disk-shaped flange to be housed in the shell, and a plurality of pipes having both ends arranged on the flange, and the inner side of the shell and the flange. In the shell-and-tube heat exchanger in which the space in which the pipe is arranged is formed as a heat exchange space, spacers arranged along the length direction of the pipe are provided, and the flanges are fixed to both ends of the spacer. A shell-and-tube heat exchanger, characterized in that a guide plate having an area smaller than the fan radius is supported by the spacer inside the shell. 2. The flange and the spacer are
The shell-and-tube heat exchanger according to claim 1, wherein this is positioned by a knock pin. 3. The shell and tube heat exchanger according to claim 1, wherein the guide plate can be inserted into a plate insertion groove formed in the spacer.