JP2714904B2 - Spiral heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral heat exchanger in which the structure of an inlet / outlet of a spiral flow path is easily formed.

[0002]

2. Description of the Related Art A spiral heat exchanger having partitions above and below a spiral heat transfer section is generally used as a top condenser mounted on the top of a distillation column as shown in FIGS. In this spiral heat exchanger, the upper and lower partitioning chambers are connected by a single cylinder, and the header of the spiral channel is formed by welding a half-cylinder inside the cylinder.

[0003]

Accordingly, in the conventional spiral heat exchanger, since the half cylinder is attached to the inside of the connecting cylinder by welding, an operator must enter the connecting cylinder to perform the welding operation. Therefore, there is a limit in reducing the diameter of the connecting cylinder. In addition, this welding work is difficult because it is performed in a narrow space, and this connecting cylinder is indispensable because it connects the upper and lower partitioning chambers, but the shape inside this connecting cylinder becomes complicated, and the cross-sectional area of the flow path inside the connecting cylinder is Due to the change, the pressure loss of the fluid flowing in the flow path increases. Further, it is desirable that the fluid that rises in the connecting cylinder and flows down from the upper partition chamber is uniformly dispersed in the spiral heat transfer portion, but the header portion of the spiral flow path inside the connecting cylinder obstructs the flow of the fluid. There are disadvantages such as poor dispersion and poor heat transfer performance.

[0004] The present invention solves design constraints and machining problems, simplifies the shape of the inside of a connecting pipe, reduces pressure loss of fluid, and makes uniform distribution to a heat transfer section. Aim.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and a plurality of plates are spirally wound to form a spiral flow path and a spiral axial flow path alternately. To form a heat exchanger main body, and an outer cylinder is inserted into the heat exchanger main body, and an annular flow path is formed between the inner cylinder and the outer cylinder inserted into the outer cylinder. The gist of the invention is that the annular flow path and the center of the spiral flow path are electrically connected, and both ends of the inner cylinder are opened to partition chambers formed at the upper and lower ends of the heat exchanger body.

[0006]

[Function] Insert the inner cylinder into the outer cylinder of the required diameter, and insert the upper and lower ends of the inner and outer cylinders into the upper plate and the lower plate by inserting the header of the spiral flow passage arranged in the center of the spiral heat transfer section. Since it is manufactured, welding work in a narrow cylinder as in the past is eliminated,
Workability is good, and the diameter of the connecting portion can be freely set. Furthermore, since the connecting pipe has a simple shape with a cylinder, and there is no change in the cross-sectional area of the flow path, the pressure loss of the fluid is reduced, and the dispersion of the fluid that has risen in the connecting pipe in the partition chamber is improved,
The heat uniformly flows into the spiral heat transfer portion, and the heat transfer performance is improved.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a spiral heat exchanger according to the present invention. In the drawing, reference numeral 1 denotes a main body outer tube of a spiral heat exchanger having a required diameter and a total length. A heat exchanger main body 2 serving as a spiral heat exchanger is inserted into the main body outer tube 1 to be integrated therewith. A supply port 3 and a discharge port 4 for a fluid flowing down the spiral flow path a into the heat exchanger main body 2 are provided so as to protrude through the main body outer pipe 1 and supplied from one end opening of the main body outer pipe 1. A condensed water discharge port 5 for the fluid flowing down in the spiral axial flow path b is provided on the outer tube 1 of the main body.

The heat exchanger body 2 has two (or four) heat exchangers.
The metal plates 21 and 22 are opposed to each other with a gap for forming a required flow path between the plates, and are spirally wound. Both end edges of the two metal plates 21 and 22 are as shown in the figure. And is closed by the metal plates 21 and 22 and is spirally swirled.
And a spiral axial flow path b is disposed between the spiral flow paths a. The axial flow path b has a spiral shape, but at the edges of the metal plates 21 and 22. It is open,
The fluid supplied into the main body outer tube 1 is made to flow freely. The fluid supplied from the supply port 3 flows down the spiral flow path a along the spiral flow path, and the fluid is supplied from the discharge port 4 to the outside. It is led to.

In the center of the heat exchanger body 2,
An outer cylinder 23 is disposed and fixed at the center where the metal plates 21 and 22 are spirally wound so as to penetrate the center, and a gap is formed in the outer cylinder 23 to form a required flow path. The inner and outer cylinders 23, 24 are fitted with upper and lower plates 25 and 26 at the upper and lower ends of the inner and outer cylinders 23, 24. , 26 are welded together to form an integral body, and a plurality of holes are drilled at a position in contact with the outer cylinder 23 and the spiral flow path a, and from the end of the spiral flow path a into the outer cylinder, that is, between the inner and outer cylinders. Fluid flows into the annular flow path C.

In the embodiment shown in FIGS. 1 and 2, one fluid is supplied from the outer peripheral portion of the spiral flow path a of the spiral heat exchanger body 2 and is caused to flow down to the inner peripheral side while sequentially performing heat exchange. Although the fluid is led out of the discharge port 4 through the central annular flow path C, the fluid may be supplied from the annular flow path C so as to flow downward from the center of the spiral flow path a in the outer peripheral direction. It is possible.

Therefore, the other fluid supplied into the main body outer tube 1 of the spiral heat exchanger constructed as described above is tapered between the lower plate 26 and the main body outer tube 1 so as to flow through the inner cylinder 24. Is provided. Therefore, the fluid flows upward from below in the inner cylinder, and flows down in the spiral flow path a when flowing down in the axial flow path b of the heat exchanger body 2 from the sealed upper partition R. The heat is exchanged through the metal plates 21 and 22 by the thermal energy of the fluid, and after being cooled or heated as desired, the fluid is discharged from the discharge port 5 to the outside. The discharge port 5 is provided on the partition plate 2 as shown in FIG.
The condensed liquid of the fluid is provided between the heat exchanger 7 and the lower part of the heat exchanger main body, and is discharged from the discharge port 5 through a chamber formed by the partition plate 27.

FIGS. 3 and 4 show an embodiment used as a thermosiphon reboiler. In this case, the heat exchanger main body 2 configured as described above is disposed in the main body outer pipe 1, the upper and lower ends of the main body outer pipe 1 are closed by the cover plates 6, 6, and the fluid is supplied to the lower partition chamber R. A supply port 7 is provided with a discharge port 8 protruding from an upper partition R, and steam or a heat medium is circulated through a spiral flow path a to exchange heat (heat) fluid in an axial flow path b.
Thus, the vaporized gas is led out from the discharge port 8 to the outside.

In the above embodiment, the two metal plates 21 and
2 and are spirally formed. The four metal plates are stacked and spirally wound, and two spiral channels and two axial channels, a total of four channels, are formed. A spiral heat exchanger integrally formed can be similarly configured.

[0014]

According to the spiral heat exchanger of the present invention, a spiral flow path header provided at the center of the spiral heat transfer portion is provided by inserting an inner cylinder into an outer cylinder having a required diameter, and vertically moving the inner and outer cylinders. Since the end is manufactured by welding the upper plate and the lower plate, the connecting pipe has a simple shape with a cylinder and the cross-sectional area of the flow path does not change, so
Advantages such as reduced pressure loss of fluid, better dispersion of fluid flowing down the connecting pipe in the partitioning chamber, uniform flow into the spiral heat transfer section, improved heat transfer performance and simplified manufacturing Having.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a spiral heat exchanger of the present invention.

FIG. 2 is a cross-sectional view of the same.

FIG. 3 is a longitudinal sectional view of an embodiment of a thermosiphon reboiler.

FIG. 4 is a cross-sectional view of the same.

FIG. 5 is a longitudinal sectional view of a known spiral heat exchanger.

FIG. 6 is a transverse sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body outer tube 2 Heat exchanger main body 21 Metal plate 23 Outer cylinder 24 Inner cylinder 25 Upper plate 26 Lower plate a Spiral flow path b Spiral axial flow path c Annular flow path R Partition chamber

Claims (1)

(57) [Claims] 1. A heat exchanger main body is formed by spirally winding a plurality of plates and alternately providing a spiral flow path and a spiral axial flow path to form a heat exchanger main body. An outer cylinder is inserted, an annular flow path is formed between the inner cylinder and the outer cylinder inserted into the outer cylinder, and the annular flow path and the center of the spiral flow path are electrically connected to each other. A spiral type heat exchanger characterized in that both ends of the spiral heat exchanger are opened to partition chambers formed at upper and lower ends of a heat exchanger body.