JP2824404B2 - 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 which is easy to manufacture, eliminates uneven flow such as drift of a fluid substance to be heat-exchanged, and performs uniform heat exchange.

[0002]

2. Description of the Related Art Spiral heat exchangers are widely used to continuously cool or heat a fluid substance with a compact device. In a conventional spiral heat exchanger, a plurality of partition plates (heat transfer plates) are attached to pieces at the respective winding start ends and spirally wound, and fluid flow paths for performing heat exchange are adjacent to each other via the partition plates. It is composed. FIGS. 4 to 6 show heat exchangers in which spiral flow paths A and spiral axial flow paths B are alternately arranged. This is accomplished by welding pieces at the flow path intervals along the longitudinal axis direction of the outer peripheral surface of the central cylinder and at substantially opposing positions, and welding the base end side of each partition plate to each piece. The diaphragm is spirally wound around the outer periphery of the central cylinder so that spiral flow paths A and axial flow paths B are alternately arranged.

[0003]

Accordingly, in the conventional spiral heat exchanger having an axial flow passage, the winding start portion of the heat transfer plate serving as a partition of the flow passage is formed as shown in FIGS. Since each heat transfer plate is attached to the cylinder via a piece, it is necessary to attach a number of pieces equal to the number of heat transfer plates, and the number of welding points for this piece and the heat transfer plate becomes large, Since the width of the flow path in the axial direction is wider only in the piece portion at the plate winding start portion than in the other portions and is not constant, there is a disadvantage that the heat exchange of the fluid substance to be heat exchanged is not uniform. Further, since the axial flow path protrudes outward at the end of winding of the heat transfer plate, it is necessary to provide a heat retaining means for preventing burns and recovering heat when flowing a high-temperature fluid through the axial flow path. In addition, there is a disadvantage that the heat exchange at the protruding portion becomes non-uniform on the outside.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of welding points and the number of pieces to facilitate manufacture, and to make the heat exchange of a fluid uniform by keeping the axial flow path width constant.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. A plurality of heat transfer plates are spirally wound around the outer periphery of a central cylinder, and a spiral flow path and a spiral shaft are provided. In the spiral heat exchanger that performs heat exchange by alternately arranging the flow passages in the direction, the base end side of the heat transfer plate forming the axial flow passage and the spiral flow passage is welded to the central cylinder. The gist of the present invention is that the heat transfer plate for the axial flow path is placed in the spiral flow path while the winding end side of the heat transfer plate for the axial flow path is mounted on the stepped surface portion so as to have the flow path width.

[0006]

According to the present invention, the base end side of the heat transfer plate, which is composed of the spiral flow path and the axial flow path adjacent to each other via a partition plate, is welded and fixed to the stepped portion of the piece welded to the central cylinder. Since the number of mounting pieces at the start of winding of the heat transfer plate is reduced, labor can be saved, and the stepped piece allows the axial flow path to have a uniform width over the entire circumference.
Flow unevenness such as drift can be prevented, and uniform heat exchange can be performed even with a fluid substance having a high viscosity. Further, at the end of winding of the heat transfer plate on the axial flow path side, all of the heat transfer plates are accommodated in the spiral flow path and covered, so that even at the end of the axial flow path, uniform heat exchange is possible. , And it is not necessary to keep the heat as in the conventional case.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spiral heat exchanger according to the present invention will be described below with reference to the illustrated embodiment. In the figure, reference numeral 1 denotes a closed central cylinder disposed inside a spiral heat exchanger.
The central cylinder 1 is housed in an outer casing 2, and an end plate 3 having a fluid inlet 21 and an end plate 4 having an outlet 22 are provided on both end surfaces of the outer casing 2, respectively. The outer casing 2 is sealed.

A spiral heat exchanger is formed by spirally winding two heat transfer plates 6 and 7 serving as partition plates around the outer periphery of the central cylinder 1, and the two heat transfer plates 6 and 7 are wound. As shown in FIGS. 1 and 2, a piece 5 is used at the start end. The piece 5 is attached along the entire length of the central cylinder 1 in the axial direction of the outer peripheral surface, and is fixed to the central cylinder 1 in a watertight manner by welding.

As shown in FIG. 2, the outer surface of the piece 5 is formed with stepped steps 51 and 52, and the steps 5 and 52 are cut only by the thickness of the heat transfer plates 6 and 7, respectively. Thus, the heat transfer plate mounting portions 51a and 52a are respectively formed. At this time, the space between the step surfaces of the pieces, that is, the space in the diameter direction of the spiral heat exchanger is determined so as to be the width of each of the spiral flow path A and the axial flow path B.

The base ends of the heat transfer plates 6 and 7 are overlapped and welded to the heat transfer plate mounting portions 51a and 52a of the respective stages of the piece 5 welded to the central cylinder 1. This is the heat transfer plate mounting part 51 of the piece.
After the heat transfer plate 6 is welded onto the heat transfer plate a, the heat transfer plate 7 is welded onto the heat transfer plate mounting portion 52a to be integrated.

Then, the heat transfer plates 6 and 7 are spirally wound via distance pieces so as to keep the width of each flow path. The winding number is determined so as to have a predetermined spiral flow path length, and the end portion of the heat transfer plate 7 forming the axial flow path B has a spiral flow path A as shown in detail in FIG. To be covered inside.

The main body of the spiral heat exchanger formed by winding the heat transfer plates 6 and 7 around the outer periphery of the central cylinder 1 is housed in the outer casing 2, and the axial flow path B is formed in the outer casing 2. The inflow port 11 protrudes from the end of winding of the heat transfer plate 6 of the spiral flow path A, and the outflow port 12 protrudes from the central cylinder 1 side. It protrudes outward from the outer housing 2.

Therefore, in the spiral heat exchanger constructed as described above, a high-viscosity, high-temperature fluid flows through the axial flow path A, and cooling water for cooling the same flows through the spiral flow path B. When the fluid having a high viscosity passes through the heat transfer plates 6 and 7 and flows through the axial flow path A having the uniform width, desired heat exchange is performed. At this time, since the axial flow path width is uniform, uneven flow such as drifting does not occur, so that uniform heat exchange is reliably performed.

The spiral heat exchanger can also be used for fluids such as heating and cooling of gases other than high-viscosity fluid substances and condensation. Further, in the above embodiment, one piece 5
Although the two heat transfer plates 6 and 7 are mounted stepwise, it is also possible to mount three heat transfer plates. Also, two pieces 5 for attaching the base ends of the two heat transfer plates in a stepped manner were attached to one central cylinder at two locations, and a total of four heat transfer plates were simultaneously spirally wound to form four flow paths. It is also possible to use a spiral heat exchanger.

[0015]

According to the spiral heat exchanger of the present invention, the number of mounting pieces is reduced at the beginning of winding of the heat transfer plate wound around the outer periphery of the central cylinder, so that labor saving can be achieved.
By devising the shape of the piece, the width of the flow path on the axial direction side can be made uniform. Thereby, uneven flow such as drift can be prevented. Further, at the winding end portion of the heat transfer plate, the heat transfer plate in the axial direction is entirely covered with the spiral-side flow path, so that there is an advantage that there is no need to perform uniform heat exchange and heat insulation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a spiral heat exchanger of the present invention.

FIG. 2 is an enlarged cross-sectional view of the heat transfer plate winding start portion.

FIG. 3 is a longitudinal sectional view of the same.

FIG. 4 is a cross-sectional plan view of a conventional example.

FIG. 5 is an enlarged cross-sectional view of the heat transfer plate winding start portion.

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

[Explanation of symbols]

 Reference Signs List A spiral channel B axial channel 1 central cylinder 2 outer casing 5 piece 51 stepped surface 52 stepped surface 6 heat transfer plate 7 heat transfer plate

Claims (2)

(57) [Claims] 1. A spiral heat exchanger in which a plurality of heat transfer plates are spirally wound around the outer periphery of a central cylinder, and a spiral flow path and a spiral axial flow path are alternately arranged to exchange heat. In the exchanger, the base end side of the heat transfer plate forming the axial flow path and the spiral flow path is attached to the step surface portion of the piece in which the heat transfer plate is welded to the central cylinder so as to have the respective flow path widths. A spiral heat exchanger wherein the winding end of a heat transfer plate for a flow path is accommodated in a spiral flow path. 2. The spiral heat exchanger according to claim 1, wherein the heat transfer plate is spirally wound so that the axial flow path has a uniform width over the entire circumference.