CN218238518U

CN218238518U - Tube-fin heat exchanger combined with longitudinal corrugation and vortex generator

Info

Publication number: CN218238518U
Application number: CN202222311841.7U
Authority: CN
Inventors: 万萱兴; 胡东亮; 胡红雷; 宋克伟
Original assignee: Lanzhou Jiaotong University
Current assignee: Lanzhou Jiaotong University
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2023-01-06
Anticipated expiration: 2032-08-31

Abstract

The utility model relates to a heat exchanger technical field discloses a tube fin heat exchanger of longitudinal corrugation and vortex generator combination, including the heat exchange tube, longitudinal corrugation fin punches the wing section vortex generator that comes out on the fin. The longitudinal corrugated fin is additionally provided with a triangular corrugated area among tube rows of the heat exchange tube, and the airfoil vortex generator is arranged in a straight fin area behind the heat exchange tube. The utility model discloses the vertical ripple that adopts and vortex generator combination fin can produce vertical whirlpool under the condition that has the incoming flow to produce with the ripple region of fin and interfere, weaken the speed that vertical whirlpool disappears, increase heat transfer area simultaneously, further strengthen the whole heat transfer performance of fin side.

Description

Tube-fin heat exchanger combined with longitudinal corrugation and vortex generator

Technical Field

The utility model relates to a heat exchanger technical field specifically is a tube-fin heat exchanger of vertical ripple and vortex generator combination.

Background

The tube fin heat exchanger has wide application in the industries of power, chemical engineering, refrigeration and the like. Practice proves that the thermal resistance of the fin side of the tube-fin heat exchanger generally accounts for more than 90% of the total thermal resistance, so that the heat exchange efficiency is improved while the flow resistance is not greatly improved, which is the focus of attention of researchers. Because of the economical efficiency and the fin efficiency, the fin area of the tube-fin heat exchanger cannot be increased without limit, and therefore, it is one of the main directions of research to enhance the heat exchange characteristics of the fin surface by using the secondary flow generated by the vortex generator.

The prior vortex generator strengthens the heat exchange mode, can generate longitudinal vortex in fluid, and aggravates the disturbance intensity of the fluid around the vortex generator, thereby weakening or destroying a heat transfer boundary layer, promoting the heat transfer between a heat transfer wall surface and main flow fluid, promoting the mixing between cold fluid and hot fluid, and effectively strengthening the convection heat exchange performance. The vertical whirlpool that the vortex generator produced weakens gradually along with the mainstream motion and disappears, for further promoting the heat transfer performance of pipe fin heat exchanger, the utility model discloses a vertical ripple and wing section vortex generator common work's form can slow down disappearing of the vertical whirlpool that the vortex generator produced as far as, increases fin heat transfer area simultaneously, promotes the whole heat transfer effect of fin.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to design a tube fin heat exchanger of vertical ripple and vortex generator combination to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a tube fin heat exchanger of vertical ripple and vortex generator combination, includes heat exchange tube and the vertical ripple fin of cover on the pipe, its characterized in that: longitudinal corrugation fin and heat exchange tube cooperation, the rear of every heat exchange tube is provided with a pair of wing type vortex generator, wing type vortex generator is the little wing of triangle, wing type vortex generator frontal surface direction is towards the incoming flow direction. And the longitudinal corrugated fin is stamped and folded at the center of the heat exchange tube bank to form a longitudinal triangular corrugation.

Preferably, the airfoil vortex generators are symmetrical about a central line of the pipe hole; the airfoil vortex generator is formed by stamping and folding the longitudinal corrugated fins, and corresponding punched holes are left on the longitudinal corrugated fins.

Preferably, the triangular corrugation is symmetrical about the central line of the two tube rows, the triangular corrugation is punched by the longitudinal corrugated fin to form an isosceles triangle, and the folding direction of the triangular corrugation comprises upward and downward. The triangular corrugations are arranged neatly, the manufacturing is simple, the processing is easy, the integral heat exchange area of the fins is increased, the structure is compact, the disappearance of longitudinal vortexes is slowed down, and the integral heat exchange efficiency of the fins is enhanced.

Preferably, the length ratio of the long right-angle edge to the short right-angle edge of the airfoil vortex generator is 2.0-1.0, and the short right-angle edge of the airfoil vortex generator is 2/3 of the fin pitch.

Preferably, the vertex of the bottom edge of the airfoil vortex generator is positioned on an arc which takes the center of the pipe hole as a concentric circle, the distance from the vertex to the center of the pipe is 1.25 to 1.5 times of the radius of the outside of the pipe, and the included angle between the airfoil vortex generator and the incoming flow direction is 115 degrees to 150 degrees.

Preferably, the base a of the triangular corrugation is 1/3-1/5 of the tube spacing S1, the height b is 2/3 of the fin spacing h1, the base is as high as the height of the airfoil vortex generator, and the extension direction of the triangular corrugation is as same as the incoming flow direction.

Preferably, the shape of the heat exchange tube includes, but is not limited to, a circle and an ellipse, and the heat exchange tube is arranged in such a way that the working fluid among the longitudinal corrugated fins, including, but not limited to, gas, is sequentially arranged.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses heat exchange efficiency is high, and the vortex generator that sets up on the fin can guide and separate the incoming flow to form vertical whirlpool, vertical whirlpool reinforcing fluid disturbance has reduced the flow resistance loss, and the triangle-shaped ripple can effectively increase heat transfer area simultaneously, slows down vertical whirlpool and disappears, has improved the holistic heat exchange efficiency of fin, has reduced pump power under the same heat load, has improved energy economy.

2. The utility model discloses simple structure, the arrangement rule can turn over a fin and make the triangle-shaped ripple when making vertical corrugated fin, and the triangle-shaped ripple can be when increasing less flow resistance, and cooperation airfoil vortex generator improves the whole heat exchange efficiency of fin, and airfoil vortex generator's size is less, all arranges both sides behind the pipe, and stamping die makes fairly simplely, and airfoil vortex generator is gone out in vertical corrugated fin assigned position punching press, has increased indirect heating equipment's compactedness.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a top view of the present invention;

FIG. 3 is a right side view of the present invention;

fig. 4 is a front view of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a heat exchange pipe; 2. punching; 3. a wing vortex generator; 4. a longitudinal corrugated fin; 5. a tube hole; 6. triangular corrugations; s1, longitudinal pipe spacing; s2, transverse pipe spacing; h1, fin spacing; a. a corrugation height; b. the width of the corrugations.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: vertical corrugated fin (4) are through punching press triangle-shaped ripple (6), triangle-shaped ripple (6) are located in the middle of the bank of tubes, be equipped with suit heat exchange tube (1) on vertical corrugated fin (4), every heat exchange tube (1) rear is provided with a pair of wing type vortex generator (3), and the wing type vortex generator (3) are the little wing type of triangle, wing type vortex generator (3) frontal surface direction is towards the incoming flow direction. The wing-shaped vortex generator (3) is symmetrical about the central line of the heat exchange tube (1), and the wing-shaped vortex generator (3) is formed by stamping and folding the longitudinal corrugated fins (4), so that the design and manufacturing process is simple and easy to process. Triangular bevel edges and short right-angle edges are punched on the longitudinal corrugated fins (4) at the rear part of the heat exchange tube (1), and the triangular wing-shaped vortex generator (3) can be obtained by turning the longitudinal corrugated fins upwards for 90 degrees.

The working principle is as follows: the flow resistance of the fluid of the tube fin heat exchangers arranged in sequence is small, the accumulated dust is easy to clean in the form of sequential arrangement, the triangular corrugations added in the middle of the tube bank can not increase too much flow resistance, and meanwhile, the heat exchange area of the fins can be increased. The wing-shaped vortex generators formed by stamping at two sides behind the heat exchange tube can guide and separate incoming flow and form longitudinal vortices, the longitudinal vortices gradually weaken along with the flow of fluid and finally disappear, and the longitudinal vortices can disturb the fluid and enhance heat exchange. The triangular corrugations can guide the fluid to flow, and certain benefit is brought to the enhanced heat exchange under the condition that the flow resistance among the fins is not obviously increased. Also reduced the flow resistance loss simultaneously, improved heat exchange efficiency, increased indirect heating equipment's compactedness, reduced pump power under the same heat load, improved energy economy, this is exactly the utility model relates to a tube-fin heat exchanger's of longitudinal corrugation and vortex generator combination theory of operation.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a tube fin heat exchanger of vertical ripple and vortex generator combination, includes heat exchange tube (1) and longitudinal ripple fin (4) of cover on heat exchange tube (1), its characterized in that: the heat exchanger is characterized in that the longitudinal corrugated fins (4) are provided with pipe holes (5), the heat exchange pipes (1) are arranged in sequence, a pair of wing-shaped vortex generators (3) are arranged behind each pipe hole (5), the wing-shaped vortex generators (3) are triangular small wing-shaped, and the frontal surface direction of the wing-shaped vortex generators (3) faces the incoming flow direction; the triangular corrugation (6) is added in the middle of the tube row of the heat exchange tube (1), and when the airfoil vortex generator (3) generates longitudinal vortexes, the triangular corrugation (6) can slow down weakening of the longitudinal vortexes.

2. The tube and fin heat exchanger in combination with a longitudinal corrugation and a vortex generator of claim 1, wherein: the airfoil vortex generators (3) are symmetrically obtained about the central line of the pipe hole (5); the airfoil vortex generator (3) is formed by stamping and folding a longitudinal corrugated fin (4), and a corresponding punched hole (2) is reserved on the longitudinal corrugated fin (4).

3. The tube and fin heat exchanger in combination with a longitudinal corrugation and a vortex generator of claim 1, wherein: the triangular corrugations (6) are arranged on the central lines of the two tube rows, the triangular corrugations (6) are punched and folded by the longitudinal corrugated fins (4) to form a triangle, the length of the triangular height b is equal to that of the short right-angle side of the airfoil vortex generator (3), and the folding direction of the triangular corrugations (6) comprises upward and downward.

4. The tube and fin heat exchanger in combination with a longitudinal corrugation and a vortex generator of claim 1, wherein: the length ratio of the long right-angle edge to the short right-angle edge of the airfoil vortex generator (3) is 2.0-1.0, and the short right-angle edge of the airfoil vortex generator (3) is 2/3 of the fin spacing.

5. The tube and fin heat exchanger in combination with a longitudinal corrugation and a vortex generator of claim 1, wherein: the starting point of the long right-angle edge of the airfoil vortex generator (3) is positioned on the concentric circular arc of the pipe hole (5), and the included angle between the airfoil vortex generator (3) and the incoming flow direction is 115-150 degrees.

6. The tube and fin heat exchanger in combination with a longitudinal corrugation and a vortex generator of claim 1, wherein: the triangular corrugations (6) are isosceles triangles, the bottom side a is 1/3-1/5 of the tube spacing S1, the height b is 2/3 of the fin spacing h1, the height of the triangular corrugations is the same as that of the airfoil vortex generator (3), and the extending direction of the triangular corrugations (6) is the same as the incoming flow direction.

7. The tube and fin heat exchanger with longitudinal corrugations and a vortex generator in combination as claimed in claim 1, wherein: the shape of the heat exchange tube (1) comprises, but is not limited to, a circle and an ellipse, the heat exchange tube is arranged in sequence, and the working fluid between the longitudinal corrugated fins (4) comprises, but is not limited to, gas.