CN215295966U

CN215295966U - Novel slotted fin of plate-fin heat exchanger

Info

Publication number: CN215295966U
Application number: CN202121729896.9U
Authority: CN
Inventors: 王定标; 刘奥克; 王光辉; 袁洪琳; 彭梦博; 张朋; 张建
Original assignee: Zhengzhou University
Current assignee: Zhengzhou University
Priority date: 2021-07-24
Filing date: 2021-07-24
Publication date: 2021-12-24
Anticipated expiration: 2031-07-24

Abstract

The utility model discloses a novel fin is slotted to plate-fin heat exchanger comprises straight fin and 1/2 tear-drop shape inclusion, at first cracks on the slab through the cutter, then goes out the 1/2 tear-drop shape inclusion that cross-protrusion and sunken being square arranged through the mould punching press, and the rolling is taken shape at last, and its major structure parameter includes: height h of fin_fThickness delta of fin_fDistance s in the wing_fSpacing between adjacent bags c_fDistance b from the bag body to the fin edge_fThe back circle of the bag body is a halfThe diameter R, the length L1 of the tear drop, the curvature K of the front arc of the tear drop, and the front arc of the tear drop is connected with the back circle of the bag body in a tangent way; according to the novel slotted fin of the plate-fin heat exchanger, adjacent fins are supported by partition plates, the partition plates are sealed by sealing strips, fluid flows in the direction vertical to the opening of the bag body, the special structure of the novel slotted fin can realize multiple flows such as forward flow, reverse flow and cross flow, when the fluid flows through or enters the bag body, the local flow velocity can be improved, the boundary layer is thinned, the temperature gradient is increased, strong secondary flow is generated, and the comprehensive performance of the novel slotted fin is improved; the overall shape of the novel fin is the same as that of a common fin, and the novel fin has high universality.

Description

Novel slotted fin of plate-fin heat exchanger

Technical Field

The utility model relates to a novel plate-fin heat exchanger slotting fin belongs to intensive heat transfer and industrial energy saving technique

The field of the technology.

Background

The plate-fin heat exchanger is a general thermal power mechanical device, and is rapidly developed in various fields due to the excellent performances of high heat exchange coefficient, good energy-saving effect, compact and light structure, aluminum structure and the like. The air-conditioning system is mainly applied to industries such as automobile aviation and the like in the early stage, and is widely applied to the fields of aviation, automobiles, diesel locomotives, engineering machinery, air separation, petrifaction, refrigeration, air-conditioning, deep low temperature and the like. The plate-fin heat exchanger is developed in China from the middle of the 60 th century in the twentieth century, and fins produced by the plate-fin heat exchanger comprise three types of straight fins, perforated fins and sawtooth-shaped fins.

The plate-fin heat exchanger has outstanding advantages, so that theoretical research and product research and development of the plate-fin heat exchanger are enhanced, the plate-fin heat exchanger plays a role in wider fields, and the plate-fin heat exchanger has important significance for saving energy and reducing consumption in China, reducing production cost of enterprises, improving equipment efficiency, reducing operation and maintenance cost and the like. However, in China, the development and manufacturing level of the plate-fin heat exchanger is low, the development capacity is weak, the independent property right in the aspect is not available, the produced fin is single, the main fin comes from an inlet, the fin is a core part of the plate-fin heat exchanger, and the design of the fin directly influences the heat exchange effect of the whole plate-fin heat exchanger.

Disclosure of Invention

In order to overcome the above-mentioned not enough, the utility model provides a novel plate-fin heat exchanger cracks fin, this novel plate-fin heat exchanger cracks fin can improve the interior fluid velocity of flow of runner, the attenuate boundary layer, and increase temperature gradient when the fluid flows through or gets into 1/2 tear-drop shape inclusion, produces strong secondary flow to very big improvement its comprehensive properties.

The utility model adopts the technical proposal that: the novel plate-fin heat exchanger slotted fin is formed by combining a straight fin and an 1/2 teardrop-shaped bag body, and is characterized in that: the fin is made of aluminum, firstly, a slot is formed in a light plate, then, crossed convex and concave bodies are punched, 1/2 tear-drop-shaped bag bodies which are arranged in a square shape are formed, and finally, the aluminum fin is formed by rolling according to the size.

The novel plate-fin heat exchanger slotted fin has the same overall dimension as that of a common fin, has good universality, can perfectly replace the original fin, and can be used independently or mixed with the common fin.

The 1/2 teardrop-shaped inclusion is crossed and convex and concave on the fin and is arranged in a square shape, when fluid flows through or enters the 1/2 teardrop-shaped inclusion, the generated strong secondary flow continuously impacts the inclusion, and the fluid boundary layer is thinned, so that the comprehensive heat exchange performance is superior to that of the common plate-fin heat exchanger fin.

The novel plate-fin heat exchanger slotted fin has the following main structural parameters: height h of fin_fThickness delta of fin_fDistance s in the wing_fSpacing between adjacent bags c_fDistance b from the bag body to the fin edge_fThe radius R of the back circle of the bag body, the length L1 of the tear drop, the curvature K of the front arc of the tear drop, the tangent connection of the front arc of the tear drop and the back circle of the bag body, and the fins of different standards correspond to corresponding structural parameters, so that the performance is optimal.

The novel plate-fin heat exchanger slotted fin has the advantages that the flow channel for medium flowing heat exchange is formed in the fin, the adjacent fins are supported through the partition plates, the adjacent partition plates are sealed through the sealing strips, fluid flows in along the vertical bag body slotted direction, different laminar fluids are not fused with each other, and the flowing forms of multiple streams and different fin layer fluids such as downstream flow, countercurrent flow and cross flow are realized.

Compare with current plate-fin heat exchanger ordinary fin, the beneficial effects of the utility model are that: 1. when fluid flows through or flows into the 1/2 teardrop-shaped bag body in the flow channel, the fluid vertically flows into the protrusion part of the 1/2 teardrop-shaped bag body, and the mutual impact of the upper fluid and the lower fluid of the flat fin at the bag body part forms a local pressure difference effect, so that longitudinal vortex and secondary flow are generated, the main flow is guided to impact the inner surface of the bag body, and the velocity gradient at the bag body part is improved; 2. according to the novel plate-fin heat exchanger slotted fin, the flow speed of fluid in a flow channel and the flow speed of a local area formed by uneven pressure distribution are increased, so that a boundary layer is thinned; 3. the novel fin structure has good universality, can perfectly replace the original fin, and can be used independently or mixed with the common fin. 4. Each standard fin corresponds to a corresponding structural parameter, so that the performance is optimized.

Drawings

FIG. 1 is a general schematic view of a slotted fin of a novel plate-fin heat exchanger;

FIG. 2 is a front view of a slotted fin of the novel plate-fin heat exchanger;

FIG. 3 is a left side view of a slotted fin of the novel plate-fin heat exchanger;

FIG. 4 is a distribution diagram of adjacent channels of the slotted fin of the novel plate-fin heat exchanger;

FIG. 5 is a schematic sectional view of the assembled slotted fin of the novel plate-fin heat exchanger;

reference numerals: 1-a separator; 2-1/2 teardrop-shaped bag body; 3-a fin; 4-a flow channel 1; 5-flow channel 2; 6-flow channel 3; 7-sealing strip

Description of the symbols: w-fin width; l-fin length; height h of fin_fThickness delta of fin_fDistance s in the wing_fSpacing between adjacent bags c_fDistance b from the bag body to the fin edge_fThe back circle radius R of the bag body, the length L1 of the tear drop, the front arc curvature K of the tear drop,

Detailed Description

The fin with the fin height of 9.5mm and the fin thickness of 0.2mm is taken as an example, and the utility model is further explained by combining the attached drawings.

FIG. 1 is a schematic view of the whole slotted fin of the novel plate-fin heat exchanger, and FIG. 2 is a schematic view of the novel plate-fin heat exchangerThe slot fin elevation view, fig. 3 is a left side view of the slot fin of the novel plate-fin heat exchanger, wherein: width of fin is W, length of fin is L, height of fin is h_f9.5mm, fin thickness δ_f0.2mm, inter-fin spacing s_f1.7mm, and the distance c between adjacent bags_f2.7mm, bag-to-fin edge distance b_f1.05mm, the radius R of the back circle of the bag body is 0.6mm, the length L1 of the tear drop is 1.8mm, and the curvature K of the front arc of the tear drop is 60.06. FIG. 4 is a distribution diagram of adjacent flow channels of the slotted fin of the novel plate-fin heat exchanger, wherein the inlet of the flow channel is vertical to the slotted direction of 1/2 teardrop-shaped inclusion and comprises a flow channel 1[4 ]]Flow channel 2[5 ]]Flow channel 3[6 ]]The flow forms of forward flow, reverse flow, cross flow and the like can be formed, and the requirement of multi-flow can be met.

The utility model discloses runner that slab fin heat exchanger crack fin formed, when fluid flowed through or flowed into 1/2 teardrop shape inclusion in the runner, fluid flowed in perpendicularly at 1/2 teardrop shape inclusion opening part, at the inclusion department, the mutual impact of straight fin both sides fluid forms local pressure differential effect, thereby produces vertical swirl and secondary flow, guides the mainstream to strike the inclusion internal surface, makes the velocity gradient at inclusion department improve; the flow velocity of the fluid in the flow channel and the flow velocity of the fluid in the flow channel are increased due to the uneven distribution of the pressure to form a high flow velocity area, so that a boundary layer is thinned; in summary, the special structure accelerates the local flow velocity in the flow channel, thins the boundary layer, increases the temperature gradient and generates strong secondary flow, and all the comprehensive capacity is obviously enhanced.

The following further describes the processing method of the slotted fin of the plate-fin heat exchanger with reference to the accompanying drawings.

A preparation stage: blanking aluminum plates with corresponding sizes according to the sizes.

And (3) slotting: and (4) slotting on the aluminum plate according to corresponding sizes.

And (3) stamping: the slotted plate is put into a die, and 1/2 tear-drop-shaped bag bodies which are in square arrangement and are crossed, convex and concave are punched on the die.

And (3) rolling stage: and rolling the punched plate into the novel plate-fin heat exchanger slotted fin on a rolling machine.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a novel plate-fin heat exchanger cracks fin which characterized in that: the novel plate-fin heat exchanger slotted fin is formed by combining a flat fin and an 1/2 teardrop-shaped bag body, a medium flowing heat exchange area is formed in a novel plate-fin heat exchanger slotted fin inner flow channel, fluid flows in along the opening direction of the vertical 1/2 teardrop-shaped bag body, the adjacent novel plate-fin heat exchanger slotted fins are supported through partition plates, and the adjacent partition plates are sealed through sealing strips.

2. The novel plate-fin heat exchanger slotted fin of claim 1, characterized in that: 1/2 the teardrop-shaped bag body is formed by slotting on a plate, punching by a die, and crossing bulges and depressions on the slotted fin of the novel plate-fin heat exchanger in a square arrangement.

3. The novel plate-fin heat exchanger slotted fin of claim 1, characterized in that: the main structural parameters of the fin depend on: height h of fin_fThickness delta of fin_fDistance s in the wing_fSpacing between adjacent bags c_fDistance b from the bag body to the fin edge_fThe radius of the back circle of the bag body is R, the length of the tear drop is L1, the curvature of the front arc of the tear drop is K, and the front arc of the tear drop is tangentially connected with the back circle of the bag body.