CN-224215887-U - Double-pipe heat exchanger with bidirectional spiral flow passage

CN224215887UCN 224215887 UCN224215887 UCN 224215887UCN-224215887-U

Abstract

The utility model relates to a double-pipe heat exchanger with bidirectional spiral flow channels, which comprises a first pipe box, a second pipe box and a pipe bundle section, wherein an inner pipe and a plurality of sleeves are arranged in the pipe bundle section, spiral fins are respectively arranged between the inner pipe and adjacent sleeves, between each sleeve and between the outermost sleeve and the outer wall of the pipe bundle section, a plurality of spiral flow channels are formed in the pipe bundle section, a first partition plate is arranged in the middle of the first pipe box and is provided with a first medium inlet and a second medium outlet, and a second partition plate is arranged in the middle of the second pipe box and is provided with a second medium inlet and a first medium outlet. The first heat exchange medium and the second heat exchange medium exchange heat in a countercurrent mode through the corresponding spiral flow channels, the heat exchange area is large, the heat exchange efficiency is high, the structure is simple, and the manufacturing is convenient.

Inventors

DUAN MENGLIN
XIAO CHANGZHI

Assignees

中冶焦耐(大连)工程技术有限公司

Dates

Publication Date: 20260508
Application Date: 20250530

Claims (3)

1. A double-pipe heat exchanger with bidirectional spiral flow channels is composed of a first pipe box, a second pipe box and a pipe bundle section, and is characterized in that the pipe bundle arranged in the pipe bundle section comprises an inner pipe arranged at the center and a plurality of sleeves coaxially arranged with the inner pipe, spiral fins are respectively arranged between the inner pipe and adjacent sleeves and between the outermost sleeves and the outer wall of the pipe bundle section, a plurality of spiral flow channels are formed in the pipe bundle section, the inner pipe extends into the first pipe box and the second pipe box, a partition plate is arranged in the middle of the first pipe box and divides the first pipe box into a medium first inlet area and a medium second outlet area, the odd spiral flow channel ends of the medium first inlet area are sealed through an inlet baffle, the even spiral flow channel ends of the medium second outlet area are sealed through an outlet baffle, the medium first inlet area is sealed through an even spiral flow channel end of the first inlet area, the medium second inlet area is sealed through an even spiral flow channel end of the second inlet area, and the medium second medium outlet area is sealed through an even spiral channel end of the second inlet area.
2. The double-pipe heat exchanger with the bidirectional spiral flow passage according to claim 1, wherein the double-pipe heat exchanger is a horizontal double-pipe heat exchanger, the first pipe box, the second pipe box and the outer wall of the pipe bundle section are of an integrated structure, a cylinder body of the double-pipe heat exchanger is formed together, the inner pipe is arranged along the axial direction of the cylinder body, the first medium inlet is arranged at the top of the first pipe box, the second medium outlet is arranged at the bottom of the first pipe box, the second medium inlet is arranged at the top of the second pipe box, the first medium outlet is arranged at the bottom of the second pipe box, and supports are arranged on two sides of the bottom of the pipe bundle section.
3. The double-pipe heat exchanger with the bidirectional spiral flow channel is characterized in that a first semicircular end closure plate is arranged at the outer end of a first pipe box, the first end closure plate is welded with the inner pipe and the inner wall of the first pipe box respectively along the circumferential direction, a circular cover plate I is arranged at the outer side of the first 2 end closure plates, the cover plate I is welded with the first end closure plate and the inner pipe to seal the corresponding ends of a cylinder body and the inner pipe, a second semicircular end closure plate is arranged at the outer end of the second pipe box, the second end closure plate is welded with the inner pipe and the inner wall of the second pipe box respectively along the circumferential direction, a circular cover plate II is arranged at the outer side of the second end closure plate, and the cover plate II is welded with the second end closure plate and the inner pipe to seal the corresponding ends of the cylinder body and the inner pipe.

Description

Double-pipe heat exchanger with bidirectional spiral flow passage Technical Field The utility model relates to a double-pipe heat exchanger, in particular to a double-pipe heat exchanger with bidirectional spiral flow channels. Background The double-pipe heat exchanger is a common dividing wall type heat exchange device and consists of concentric or eccentric sleeved pipes, and in the conventional double-pipe heat exchanger, cold and hot fluid respectively flows in an inner pipe and an outer pipe and exchanges heat through the pipe walls. The basic structure of the device comprises an inner pipe (used as a flow passage of high-temperature fluid such as steam and hot water), an outer pipe (namely a sleeve pipe, wrapped on the outer side of the inner pipe and used as a flow passage of low-temperature fluid such as cold water and air), and connecting parts such as a U-shaped elbow, a flange and the like, wherein the connecting parts are used for extending the flow passage or connecting a plurality of groups of sleeve pipes in series. In general, a double-pipe heat exchanger adopts a countercurrent mode (two fluids flow reversely) to improve the heat transfer efficiency. The double-pipe heat exchanger has the advantages of simple structure, easy disassembly and cleaning, high pressure bearing, high heat transfer efficiency (especially in countercurrent) and small heat transfer area per unit volume, and is suitable for high temperature difference working conditions. The petrochemical standard SH-T3119-2000 (design Specification for petrochemical steel double-pipe heat exchanger) enumerates the structures of a single-pipe heat exchanger and a multi-pipe heat exchanger, wherein the single-pipe heat exchanger adopts a return bend structure, the manufacturing is difficult, and the heat exchange area is small. The heat exchange tubes of the multi-sleeve heat exchanger are connected by adopting the U-shaped connecting tubes and the tube plates, the manufacturing is difficult, and the heat exchange efficiency is low. Disclosure of Invention The utility model provides a double-pipe heat exchanger with bidirectional spiral flow passages, which adopts a structure that spiral fins are arranged between an inner pipe and a plurality of double-pipes coaxially, a plurality of spiral flow passages are formed on a pipe bundle section of the heat exchanger, and a first heat exchange medium and a second heat exchange medium exchange heat in countercurrent through the corresponding spiral flow passages, so that the heat exchange area is large, the heat exchange efficiency is high, the structure is simple, and the manufacturing is convenient. In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme: A double-pipe heat exchanger with bidirectional spiral flow channels comprises a double-pipe heat exchanger composed of a first pipe box, a second pipe box and a pipe bundle section, wherein the pipe bundle arranged in the pipe bundle section comprises an inner pipe arranged at the center and a plurality of sleeves coaxially arranged with the inner pipe, spiral fins are respectively arranged between the inner pipe and adjacent sleeves and between the outermost sleeve and the outer wall of the pipe bundle section, a plurality of spiral flow channels are formed in the pipe bundle section, the inner pipe extends into the first pipe box and the second pipe box, a first partition plate is arranged in the middle of the first pipe box and divides the first pipe box into a medium first inlet area and a medium second outlet area, the first end of the spiral flow channel is counted outwards from the center of the double-pipe heat exchanger, the odd end of the medium first inlet area is closed through an inlet blocking plate, the even end of the medium second outlet area is closed through an outlet blocking plate, the medium first inlet is arranged in the medium second outlet area, the medium second outlet is arranged in the medium outlet area, the even spiral flow channel end of the medium second inlet area is counted outwards from the center of the double-pipe heat exchanger, and the medium outlet area is closed through the first spiral flow channel blocking plate. The double-pipe heat exchanger is a horizontal double-pipe heat exchanger, the outer walls of a first pipe box, a second pipe box and a pipe bundle section are of an integrated structure, a barrel body of the double-pipe heat exchanger is formed together, an inner pipe is arranged along the axial direction of the barrel body, a first medium inlet is arranged at the top of the first pipe box, a second medium outlet is arranged at the bottom of the first pipe box, a second medium inlet is arranged at the top of the second pipe box, a first medium outlet is arranged at the bottom of the second pipe box, and two sides of the bottom of the pipe bundle section are provided with supports. The outer end of the first pipe box is provided wi