CN115143831A - Double-dislocation type high-heat-dissipation-performance plate-fin heat exchanger - Google Patents

Abstract

The invention discloses a double-displacement type plate-fin heat exchanger with high heat dissipation performance. , and along the length direction of the heat exchange space, the upper cover plate is sequentially provided with a number of upper heat exchange fin groups, and the lower cover plate is sequentially provided with a number of lower heat exchange fin groups; The heat exchange fin group and the lower heat exchange fin group are respectively provided with a number of heat exchange fins at intervals; The heat exchange fin groups are staggered in sequence; along the length direction of the heat exchange space, the flow channel gap between two adjacent heat exchange fins in the upper heat exchange fin group of each row, and the adjacent lower heat exchange fin group The forehead channel gaps between two adjacent heat exchange fins in the middle are staggered from each other. By adopting this scheme, the local turbulent flow state is artificially created by two-way staggered arrangement, thereby improving the heat exchange capacity.

Description

A double-displacement plate-fin heat exchanger with high heat dissipation performance

technical field

The invention relates to the technical field of heat exchange equipment, in particular to a double dislocation type plate-fin heat exchanger with high heat dissipation performance.

Background technique

In order to solve the urgent heat dissipation needs of current electronic equipment, plate-fin heat exchangers have been more and more widely researched and applied due to the advantages of large heat exchange area per unit volume and higher efficiency. At present, the measures for strengthening heat exchange of plate-fin heat exchangers mainly include changing the cross-sectional shape, such as the patent with the application number CN03221546.0 and the name is corrugated finned tubes; by adopting rough surface fins, fins, grooves etc., for example, the application number is CN201210407001.9, and the name is a patent for a pulse jet fin cooling device; an interpolated turbulent element is used, such as the application number CN201410389255.1, the name is a heat exchanger and the heat exchanger of these three ways of manufacturing methods.

In recent years, more and more scientific researchers have been working on the research and development of new compact heat exchangers. In addition to increasing the heat transfer area to increase the compactness of the heat exchanger to improve heat transfer efficiency, they have gradually turned to some complex internal structures. developed for this purpose.

Most of the current compact plate-fin heat exchangers, such as the above three published patents, are based on straight fins for design improvements. In the plate-fin type, the direction of the fins is consistent with the direction of fluid flow, and the flow channel is too long, resulting in The temperature difference between the inlet and outlet is large, the heat exchange efficiency at the inlet is high, and the efficiency at the rest is low. At the same time, there is the problem of uneven distribution of fluid in the flow channel, which limits the efficiency of the plate-fin heat exchanger.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a double-displacement type plate-fin heat exchanger with high heat dissipation performance. By adopting this scheme, by staggering a number of heat exchange fins in the vertical direction and the length direction, the fluid in the flow channel and the fluid in the flow channel are destroyed. The heat exchange boundary layer between the walls artificially creates a local turbulent state to improve the heat exchange capacity.

The present invention is achieved through the following technical solutions:

A double-displacement plate-fin heat exchanger with high heat dissipation performance includes a butt-jointed upper cover plate and a lower cover plate;

A heat exchange space is left between the upper cover plate and the lower cover plate; located in the heat exchange space, and along the length direction of the heat exchange space, the upper cover plate is sequentially provided with a number of upper heat exchange fins A plurality of lower heat exchange fin groups are arranged on the lower cover plate in sequence;

along the width direction of the heat exchange space, each row of the upper heat exchange fin group and the lower heat exchange fin group are respectively provided with a plurality of heat exchange fins at intervals;

along the vertical direction of the heat exchange space, each row of heat exchange fin groups of the upper cover plate and each row of heat exchange fin groups of the lower cover plate are arranged at intervals and staggered in sequence;

Along the length direction of the heat exchange space, the flow channel gap between the adjacent two heat exchange fins in the upper heat exchange fin group of each row, and the adjacent two heat exchange fins in the adjacent lower heat exchange fin group The forehead channel gaps between the fins are staggered from each other.

Compared with the prior art, for a long plate-fin heat exchanger, the thermal performance of the traditional plate-fin heat exchanger at its rear end will be greatly reduced, mainly because the traditional plate-fin heat exchanger is in The flow of the back-end fluid will form a stable and thicker boundary layer, and its heat exchange performance will be greatly reduced. This solution provides a double-displacement high heat dissipation plate-fin heat exchanger. In the scheme, the upper cover plate and the lower cover plate are connected to each other, and the heat exchange space enclosed by the upper cover plate and the lower cover plate is included. The heat exchange fin group, the lower cover plate is sequentially provided with several rows of lower heat exchange fin groups along its length direction, by dislocating the fins protruding from the upper and lower cover plates to each other, so that the upper and lower cover plates can be realized in the length direction, that is, horizontal At the same time, the upper heat exchange fin group and the lower heat exchange fin group are arranged with a number of heat exchange fins at intervals along the width direction, and in two adjacent heat exchange fin groups, the heat exchange The flow channel gaps at the fins are staggered, so that in the vertical direction, the breaking positions of the fins protruding from the upper and lower cover plates are different, so that the upper and lower cover plates are dislocated in the vertical direction.

The above design aims to achieve: through the design of bidirectional dislocation interruption, a stable boundary layer cannot be formed. When the fluid passes through each interruption position, the original boundary layer will break, and the fluid will contact the fin again. Thus, a new boundary layer is formed, and the thickness of the boundary layer is reduced. In this process, the heat transfer coefficient is improved, and the overall heat transfer capacity is improved. At the same time, the fins between the upper and lower cover plates are double-displaced. , forming a staggered flow channel, which will make the fluid flow more uniform and its heat exchange efficiency is higher.

Further optimization, the width direction of the heat exchange fins is set along the direction perpendicular to the flow channel in the heat exchange space; in order to further shorten the length of each flow channel, in this solution, the width direction of each heat exchange fin is They are all perpendicular to the flow channel direction in the heat exchange space, that is, the heat exchange fins are arranged vertically, and are arranged along the width direction of the upper and lower cover plates. When the fluid flows into the flow channel in the heat exchanger, the vertical arrangement makes the flow channel change If it is shorter, it is difficult to form a stable boundary layer, which further improves the heat exchange efficiency.

Further optimization, each of the heat exchange fins are parallel to each other, so that the heat exchange in each flow channel is uniform.

Further optimization, the horizontal height of the lower ends of the heat exchange fins in the upper heat exchange fin group is lower than the horizontal height of the upper ends of the heat exchange fins in the lower heat exchange fin group.

Further optimization, the lower ends of the heat exchange fins in the upper heat exchange fin group extend out of the upper cover plate; the upper ends of the heat exchange fins in the lower heat exchange fin group extend out of the lower cover plate; Increasing the length of the heat exchange fins can increase the heat exchange area of each heat exchange fin and improve the heat exchange efficiency.

Further optimization, a flow channel gap is left between the lower ends of the heat exchange fins in the upper heat exchange fin group and the lower cover plate; the upper ends of the heat exchange fins in the lower heat exchange fin group and the upper cover There is a flow channel gap between the plates; in order to reduce the pressure, in this scheme, a flow channel gap is left between the heat exchange fins of the upper cover plate and the lower cover plate, or it is not directly in contact with the base of the lower cover plate. The heat exchange fins of the lower cover plate and the upper cover plate are left with a flow channel gap, or are not directly contacted with the base of the upper cover plate, so as to ensure that the pressure of the heat exchanger is small.

Further optimization, the two ends along the length direction of the heat exchange space are respectively provided with an inlet and an outlet; in order to improve the heat exchange efficiency, in this scheme, the two ends respectively in the length direction of the heat exchange space, that is, the two ends of the upper and lower cover plates Set the inlet and outlet to make the fluid pass through as many flow channels and heat exchange fins as possible.

Further optimization, the cross section of the heat exchange space is rectangular, and the inlet and the outlet are respectively set at two diagonal positions; in order to maximize the heat exchange efficiency, in this scheme, the inlet and outlet positions need to be set at two diagonal positions respectively. It is located at two diagonal positions, that is, the two ends of the longest diagonal line inside, so that the fluid passes through the most flow channels and heat exchange fins.

Further optimization, the end portion of the upper cover plate and the end portion of the lower cover plate are welded and connected.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The present invention provides a double-displacement type plate-fin heat exchanger with high heat dissipation performance. Using this scheme, the plate-fin heat exchanger is designed in the form of upper and lower cover plates, and the fins of the upper and lower cover plates are of a dislocation structure. The perforation design on the fins is also a dislocation design, which realizes the double dislocation structure of the plate-fin heat exchanger, thereby destroying the heat exchange boundary layer between the fluid and the wall in the flow channel, artificially creating a local turbulent state, and improving the heat exchange capacity.

2. The present invention provides a double-displacement type plate-fin heat exchanger with high heat dissipation performance. With this solution, the direction of the fins in the plate-fin heat exchanger is perpendicular to the fluid flow direction, so that the length of the flow channel is reduced, and the Improve the thermal efficiency of the flow channel; and break the design on the fins to make the distribution of the fluid more uniform, which can provide the utilization rate of the heat exchanger, greatly improve the heat exchange capacity, and make the temperature distribution of the heat exchanger more uniform; The interrupted design also reduces the overall pressure drop.

3. The present invention provides a double-dislocation type plate-fin heat exchanger with high heat dissipation performance. Using this scheme, the fluids in different flow channels inside the plate-fin heat exchanger are mixed with each other, so that the fluids with different temperatures are mixed with each other to exchange heat. The temperature difference of the fluid in each flow channel becomes smaller, and the overall flow field and temperature distribution are more uniform.

4. The present invention provides a double-displacement type plate-fin heat exchanger with high heat dissipation performance. With this solution, the fins of the upper cover do not contact the base of the lower cover, and the fins of the lower cover do not contact the upper cover. The base of the cover plate is in contact to ensure that the pressure of the heat exchanger is small.

Description of drawings

In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only illustrate some embodiments of the present invention, Therefore, it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort. In the attached image:

1 is a schematic structural diagram of a cross-section of an embodiment provided by the present invention;

2 is a schematic structural diagram of a longitudinal section of an embodiment provided by the present invention;

3 is a front view of an upper cover plate according to an embodiment of the present invention;

4 is a top view of an upper cover plate according to an embodiment of the present invention;

5 is a front view of a lower cover plate according to an embodiment of the present invention;

FIG. 6 is a bottom view of a lower cover plate according to an embodiment of the present invention.

The marks in the attached drawings and the corresponding parts names:

1-upper cover, 2-lower cover, 3-heat exchange fins, 4-inlet, 5-outlet.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. as a limitation of the present invention.

Example

As shown in FIG. 1 to FIG. 6 , this embodiment provides a double-displacement type plate-fin heat exchanger with high heat dissipation performance, including an upper cover plate 1 and a lower cover plate 2 that are butted;

A heat exchange space is left between the upper cover plate 1 and the lower cover plate 2; located in the heat exchange space, and along the length direction of the heat exchange space, the upper cover plate 1 is sequentially provided with a number of upper exchange There are 3 sets of heat fins, and the lower cover plate 2 is sequentially provided with a number of 3 sets of lower heat exchange fins;

Along the width direction of the heat exchange space, each row of the 3 sets of upper heat exchange fins and the 3 sets of lower heat exchange fins are respectively provided with a number of heat exchange fins 3 at intervals;

Along the vertical direction of the heat exchange space, the 3 groups of heat exchange fins in each row of the upper cover plate 1 and the 3 groups of heat exchange fins in each row of the lower cover plate 2 are arranged at intervals in sequence;

Along the length direction of the heat exchange space, the flow channel gap between the adjacent two heat exchange fins 3 in the 3 groups of upper heat exchange fins in each row, and the adjacent two adjacent groups of the 3 adjacent lower heat exchange fins. The forehead channel gaps between the heat exchange fins 3 are all staggered from each other.

Compared with the prior art, for a long plate-fin heat exchanger, the thermal performance of the traditional plate-fin heat exchanger at its rear end will be greatly reduced, mainly because the traditional plate-fin heat exchanger is in The flow of the back-end fluid will form a stable and thicker boundary layer, and its heat exchange performance will be greatly reduced. This solution provides a double-displacement high heat dissipation plate-fin heat exchanger. In the scheme, the upper cover plate 1 and the lower cover plate 2 are connected to each other, and the heat exchange space enclosed by the upper cover plate 1 and the lower cover plate 2 is included. In the heat exchange space, the upper cover plate 1 is along its length direction. Several rows of 3 sets of upper heat exchange fins are arranged in sequence, and several rows of 3 sets of lower heat exchange fins are arranged in sequence along the length direction of the lower cover plate 2 . The dislocation of the upper and lower cover plates 2 in the length direction, that is, the horizontal direction along the fluid flow direction; at the same time, the 3 groups of upper heat exchange fins and the 3 groups of lower heat exchange fins are arranged with a number of heat exchange fins 3 at intervals along the width direction, and In the adjacent two groups of heat exchange fins 3, the flow channel gaps at the heat exchange fins 3 are staggered from each other, so that in the vertical direction, the breaking positions of the fins protruding from the upper and lower cover plates 2 are different. The upper and lower cover plates 2 are dislocated in the straight direction.

The above design aims to achieve: through the design of bidirectional dislocation interruption, a stable boundary layer cannot be formed. When the fluid passes through each interruption position, the original boundary layer will break, and the fluid will contact the fin again. Thereby, a new boundary layer is formed, and the thickness of the boundary layer is reduced. In this process, the heat transfer coefficient is improved, and the overall heat transfer capacity is improved. At the same time, the fins between the upper and lower cover plates 2 The dislocation forms a staggered flow channel, which will make the fluid flow more uniform and its heat exchange efficiency is higher.

Referring to FIG. 2, as a specific embodiment way to further shorten the length of each flow channel, it is set as follows: the width direction of the heat exchange fins 3 is arranged along the direction perpendicular to the flow channel in the heat exchange space; In the scheme, the width direction of each heat exchange fin 3 is perpendicular to the flow channel direction in the heat exchange space, that is, the heat exchange fins 3 are arranged vertically, and are arranged along the width direction of the upper and lower cover plates 2. When the flow channel in the heat exchanger is arranged vertically, the flow channel becomes shorter, so that it is difficult to form a stable boundary layer, and the heat exchange efficiency is further improved.

A specific embodiment for uniform heat exchange in each flow channel is set as follows: each of the heat exchange fins 3 are parallel to each other.

In this embodiment, the horizontal height of the lower ends of the heat exchange fins 3 in the 3 groups of upper heat exchange fins is lower than the horizontal height of the upper ends of the heat exchange fins 3 in the 3 groups of lower heat exchange fins.

Please continue to refer to FIG. 2 , in the above-mentioned embodiments, a further solution is: the lower ends of the heat exchange fins 3 in the 3 sets of upper heat exchange fins protrude from the upper cover plate 1 ; the lower heat exchange fins The upper ends of the heat exchange fins 3 in the 3 groups of fins protrude from the lower cover plate 2; by increasing the length of the heat exchange fins 3, the heat exchange area of each heat exchange fin 3 can be increased, and the heat exchange efficiency can be improved.

In this embodiment, as a specific implementation for reducing the internal pressure of the heat exchanger, it is set as follows: there is a flow between the lower ends of the heat exchange fins 3 in the 3 groups of upper heat exchange fins and the lower cover plate 2 . There is a flow channel gap between the upper end of the heat exchange fins 3 in the lower heat exchange fin group 3 and the upper cover plate 1; in this scheme, the heat exchange fins 3 of the upper cover plate 1 are There is a flow channel gap between it and the lower cover plate 2, or it is not directly in contact with the base of the lower cover plate 2, and a flow channel gap is left between the heat exchange fins 3 of the lower cover plate 2 and the upper cover plate 1, Or directly not in contact with the base of the upper cover plate 1, so as to ensure that the pressure of the heat exchanger is small.

Please refer to FIG. 1, as a specific embodiment for improving the heat exchange efficiency, it is set as follows: the two ends along the length direction of the heat exchange space are respectively provided with an inlet 4 and an outlet 5; The two ends in the length direction, that is, the two ends of the upper and lower cover plates 2 are provided with an inlet 4 and an outlet 5, so that the fluid can pass through as many flow channels and heat exchange fins 3 as possible.

Please continue to refer to FIG. 1 , as a specific embodiment to maximize the heat exchange efficiency, the cross section of the heat exchange space is rectangular, and the inlet 4 and the outlet 5 are respectively set at two diagonal positions; in this solution, It is necessary to set the positions of the inlet 4 and the outlet 5 at two diagonal positions, that is, at the two ends of the longest inner diagonal line, so that the fluid can pass through the most flow channels and heat exchange fins 3 .

As a redundant solution, the end of the upper cover plate 1 and the end of the lower cover plate 2 are connected by welding.

Working principle: The present invention firstly adjusts the direction of the fins of the traditional plate-fin heat exchanger to be perpendicular to the flow direction of the fluid. When the fluid flows into the flow channel of the heat exchanger, the flow channel will become shorter and difficult to form. Stable boundary layer; at the same time, the flow channel is designed to be interrupted, so that the boundary layer cannot form a stable boundary layer, and the original boundary layer will be fractured. When the fluid flows through the interrupted position, it will contact the fin again. , a new boundary layer will be regenerated, so that the thickness of the boundary layer will become smaller, and this process will increase the heat transfer coefficient, thereby improving the overall heat transfer capacity. At the same time, the fins between the upper and lower plates are misaligned with each other, forming a staggered flow channel, which makes the fluid flow more uniform and its heat exchange efficiency is higher.

The specific embodiments described above further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A double-displacement type high heat dissipation plate-fin heat exchanger, characterized in that it comprises a butt-jointed upper cover plate (1) and a lower cover plate (2); A heat exchange space is left between the upper cover plate (1) and the lower cover plate (2); it is located in the heat exchange space, and along the length direction of the heat exchange space, the upper cover plate (1) is on the A plurality of upper heat exchange fin groups are arranged in sequence, and a plurality of lower heat exchange fin groups are arranged on the lower cover plate (2) in sequence; Along the width direction of the heat exchange space, each row of the upper heat exchange fin group and the lower heat exchange fin group is respectively provided with a plurality of heat exchange fins (3) at intervals; Along the vertical direction of the heat exchange space, each row of heat exchange fin groups of the upper cover plate (1) and each row of heat exchange fin groups of the lower cover plate are arranged at intervals in sequence; Along the length direction of the heat exchange space, the flow channel gap between the adjacent two heat exchange fins (3) in the upper heat exchange fin group of each row, and the adjacent two adjacent heat exchange fin groups in the adjacent lower heat exchange fin group. The forehead channel gaps between the heat exchange fins (3) are all arranged staggered from each other. 2 . The double-displacement high heat dissipation plate-fin heat exchanger according to claim 1 , wherein the width direction of the heat exchange fins ( 3 ) is perpendicular to the width direction in the heat exchange space. 3 . Runner direction setting. 3 . The double-displacement plate-fin heat exchanger with high heat dissipation performance according to claim 1 , wherein each of the heat exchange fins ( 3 ) is parallel to each other. 4 . 4 . The double-displacement plate-fin heat exchanger with high heat dissipation performance according to claim 1 , wherein the horizontal height of the lower ends of the heat exchange fins (3) in the upper heat exchange fin group is lower than The upper end level of the heat exchange fins (3) in the lower heat exchange fin group. 5 . The double-displacement plate-fin heat exchanger with high heat dissipation performance according to claim 4 , wherein the lower ends of the heat exchange fins ( 3 ) in the upper heat exchange fin group protrude from the an upper cover plate (1); the upper ends of the heat exchange fins (3) in the lower heat exchange fin group protrude from the lower cover plate (2). 6 . The double-displacement high heat dissipation plate-fin heat exchanger according to claim 1 , wherein the lower ends of the heat exchange fins ( 3 ) in the upper heat exchange fin group and the lower cover plate are 6 . (2) There is a runner gap between them. 7 . The double-displacement plate-fin heat exchanger with high heat dissipation performance according to claim 1 , wherein the upper ends of the heat exchange fins ( 3 ) in the lower heat exchange fin group and the upper ends of the upper heat exchange fins There is a runner gap between the cover plates (1). 8 . The double-dislocation type high heat dissipation plate-fin heat exchanger according to claim 1 , wherein the two ends along the length direction of the heat exchange space are respectively provided with an inlet (4) and an outlet (5). ). 9 . The double-displacement plate-fin heat exchanger with high heat dissipation performance according to claim 7 , wherein the cross section of the heat exchange space is rectangular, and the inlet (4) and the outlet (5) are respectively provided with 9 . at two diagonal positions. 10. A double-displacement type high heat dissipation plate-fin heat exchanger according to claim 1, characterized in that the end of the upper cover plate (1) and the end of the lower cover plate (2) Weld connection between.

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