CN110307745A - A plate-fin heat exchanger fin with plow-shaped micro-convex - Google Patents

Abstract

The invention discloses a kind of plate-fin heat exchanger fins with plow-shape dimpling, including fin body and one group of fin runner being arranged in fin body, the two sides of the fin runner are respectively equipped with towards the first heat bulge of protrusion on the outside of fin runner and towards the second heat bulge of fin runner inner bulge, the height of first heat bulge and the second heat bulge on fin runner along fluid flow direction is gradually increased, to form plow-shape micro-convex structure.The beneficial effects of the present invention are: Novel fin is formed by fin runner, when flowing through plow-shape micro-convex structure, fluid thermal boundary layer is destroyed fluid by protrusion, and fluid is shunted along plow-shape dimpling two sides, the flow disturbance inside runner is increased, the heat convection of fluid and fin is increased.

Description

A plate-fin heat exchanger fin with plow-shaped micro-convex

technical field

The invention relates to the technical field of heat exchange in air separation engineering, in particular to a plate-fin heat exchanger fin with plow-shaped micro-convex.

Background technique

In petroleum metallurgy and air separation engineering, heat exchangers play a very important role. There are many kinds of heat exchangers, and the plate-fin heat exchanger is one of the most widely used types of heat exchangers in engineering applications. Plate-fin heat exchangers are generally used in air separation plants, and fins are the most basic and most important components of plate-fin heat exchangers. The heat transfer process of heat exchangers mainly relies on the heat conduction of fins to the fluid. At present, the fins of plate-fin heat exchangers in air separation equipment have four common types of fins: straight, porous, sawtooth and corrugated. The design and manufacture level of the fins has a great influence on the heat exchange performance of the plate-fin heat exchanger, and the improved fin structure has a significant influence on the heat exchange performance of the heat exchanger.

SUMMARY OF THE INVENTION

In view of the problems existing in the prior art, the present invention provides a plate-fin heat exchanger fin with plow-shaped micro-convex with reasonable structure.

The technical scheme of the present invention is as follows:

A plate-fin heat exchanger fin with plow-shaped slightly convex is characterized in that it comprises a fin body and a group of fin flow channels arranged on the fin body, and the two sides of the fin flow channel are respectively A first heat dissipation protrusion protruding toward the outside of the fin channel and a second heat dissipation protrusion protruding toward the inner side of the fin channel are provided, and the first heat dissipation protrusion and the second heat dissipation protrusion are on the fin channel The height along the fluid flow direction increases gradually, thereby forming a plow-shaped asperity structure.

The plate-fin heat exchanger fin with plow-shaped micro-convex is characterized in that the rear end of the plow-shaped micro-convex structure is provided with an opening for convection heat exchange inside and outside the fin flow channel.

The plate-fin heat exchanger fin with plow-shaped micro-convex is characterized in that the first heat dissipation protrusion and the second heat dissipation protrusion are on both sides of the fin flow channel along the fluid flow direction and Set perpendicular to the direction of fluid flow.

The plate-fin heat exchanger fin with plow-shaped micro-convex is characterized in that the first heat dissipation protrusion and the second heat dissipation protrusion are misaligned along the fluid flow direction and perpendicular to the fluid flow direction. and staggered settings.

The plate-fin heat exchanger fin with plow-shaped micro-convex is characterized in that the cross-section of the fin flow channel is a rectangular structure.

The heat exchanger with plate-fin heat exchanger fins is characterized in that it includes one or more fin bodies.

The beneficial effects of the present invention are:

1) In the fin flow channel formed by the new type of fin, when the fluid flows through the plow-shaped asperity structure, the fluid thermal boundary layer is destroyed by the bulge, and the fluid is divided along the two sides of the plow-shaped asperity, increasing the fluid inside the flow channel The disturbance increases the convective heat transfer between the fluid and the fins;

2) Using the opening at the rear end of the plough-shaped micro-convex, the fluids on both sides of the fin can communicate with each other at the opening, which increases the flow mixing between the fluids and reduces the temperature gradient inside the fluid;

3) The new fins have the same installation and matching dimensions as the original straight fins, have good versatility with the original fins, and can be used alone or in conjunction with the original fins according to the requirements of the working conditions;

4) Through the reasonable arrangement of plough-shaped micro-convex and the utilization of openings, the heat exchange performance of the heat exchanger is improved and the pressure drop is kept within a reasonable range.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

2 is a schematic diagram of the three-dimensional structure of a single fin flow channel of the present invention;

3 is a front view of a single fin flow channel structure of the present invention;

4 is a top view of a single fin flow channel structure of the present invention;

In the figure: 1-fin body, 2-fin flow channel, 3-first heat dissipation protrusion, 4-second heat dissipation protrusion.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings.

As shown in Figures 1-4, a plate-fin heat exchanger fin with plow-shaped micro-convex includes a fin body 1, a fin flow channel 2, a first heat dissipation protrusion 3 and a second heat dissipation protrusion 4 .

Plate-fin heat exchanger fins with plow-shaped micro-convex, new type of heat exchanger fins, made of aluminum alloy material, the plough is obtained by punching the fin wall according to the design size and punching according to the design distance and arrangement. The shape is slightly convex, and the fin body is obtained by rolling and forming according to the design size. Its appearance and installation dimensions are the same as those of traditional fins, and it has good versatility with traditional straight fins. It can replace the original fins on the basis of the original heat exchanger. This new type of fins can be used alone. , or used in conjunction with other types of fins according to actual working conditions.

The plough-shaped micro-convex structure is gradually raised in the fluid flow direction of the fin, and is periodically arranged on both sides of the fin plate. The inner side of the plough-shaped micro-convex structure is also dislocated and opened to make the second heat-dissipating protrusions 4 in the same arrangement. When the fluid flows through the flow channel, it is divided by the front end of the plough-shaped micro-convex structure, and a turbulent flow is formed at the rear end of the plough-shaped micro-convex structure. The front end of the plough-shaped asperities divides the flow and forms turbulent flow, destroys the thermal boundary layer formed in the fluid flow, and improves the heat exchange effect between the fluid boundary and the fins; Intercommunication, strengthening fluid mixing, reducing the temperature gradient between the same layer of the heat exchanger, and improving the uniformity of temperature distribution in the layer.

Plate-fin heat exchanger fins with plow-shaped asperities, its structural parameters include: fin height h, fin thickness t, fin inner flow channel spacing s, other structural dimensions and the structural dimensions of the plow-shaped asperities and Distribution size. The structural dimensions and distribution dimensions of the plough-shaped asperities are: length l of the plough-shaped asperities, height b of the plough-shaped asperities, front-end angle α of the plough-shaped asperities, distance x in the flow direction of the plough-shaped asperities, height of the plough-shaped asperities Direction spacing y; size varies according to design in different heat exchangers.

Plate-fin heat exchanger with plough-shaped asperities The heat exchanger with fins is separated by partitions to form different layers. Inflow in the direction of increasing bulge height. In the direction of fluid flow, the height of the plough-shaped micro-convex gradually increases along a certain angle, resulting in a small pressure drop of the heat exchanger, which improves the heat exchange performance while maintaining the pressure drop of the heat exchanger within a reasonable range. When the fluid passes through the plough-shaped asperity, the fluid is diverted from both sides of the plough-shaped asperity, and the plough-shaped asperity destroys the thermal boundary layer of the fluid. , separated by a certain distance, in response to the shunting effect of the previous plough-shaped asperity structure, the plough-shaped asperity structure is set up again for shunting, and the newly formed thermal boundary layer is destroyed again. The periodic arrangement of such plough-shaped asperities continuously destroys the thermal boundary layer and improves the heat transfer effect of the fins. At the rear end opening of the plow-shaped micro-convex, the fluid on both sides is communicated through the plow-shaped micro-convex opening on the fin, and the fluid is redistributed to reduce the temperature gradient between the same layer of the heat exchanger. In summary, this fin form can destroy the fluid thermal boundary layer, enhance the heat exchange effect of the fins, and redistribute the fluid, and the resulting pressure drop is within a reasonable range.

The content described in the present invention is only an enumeration of the realization forms of the inventive concept, and the protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments, and equivalents made according to the structure, shape and principle of the present invention Variations should be included within the protection scope of the present invention.

Claims (5)

1. a kind of plate-fin heat exchanger fin with plow-shape dimpling, which is characterized in that distinguish the two sides of the fin runner (2) It is convex equipped with the first heat bulge (3) towards protrusion on the outside of fin runner (2) and the second heat dissipation towards fin runner (2) inner bulge It rises (4), first heat bulge (3) and the second heat bulge (4) are on fin runner (2) along the height of fluid flow direction It is gradually increased, to form plow-shape micro-convex structure.

2. a kind of plate-fin heat exchanger fin with plow-shape dimpling according to claim 1, which is characterized in that the plow-shape The rear end of micro-convex structure is equipped with opening, for outside heat convection in fin runner (2).

3. a kind of plate-fin heat exchanger fin with plow-shape dimpling according to claim 1, which is characterized in that described first Heat bulge (3) and the second heat bulge (4) are flowed in two lateral edge fluid flow directions of fin runner (2) and perpendicular to fluid Direction setting.

4. a kind of plate-fin heat exchanger fin with plow-shape dimpling according to claim 3, which is characterized in that described first Heat bulge (3) and the second heat bulge (4) are along fluid flow direction and perpendicular to dislocation on fluid flow direction and staggeredly Setting.

5. a kind of heat exchanger according to claim 1 to 4 containing the plate-fin heat exchanger fin with plow-shape dimpling, It is characterized in that, including one or more fin bodies (1).