CN210802175U - Fin and heat exchanger comprising same - Google Patents

Abstract

The utility model discloses a fin to disclose the heat exchanger that has this fin, wherein the fin includes the fin body, be provided with on the fin body: more than two openings are arranged in a linear arrangement; the heat exchange flow channel is arranged between any two adjacent openings and comprises a primary groove and a secondary groove which are sequentially communicated; wherein, the one end of one-level recess communicates two at least the one end of second grade recess, the utility model provides high temperature fluid and the intermix between the low temperature fluid to the heat transfer effect between fin and the flue gas has been improved.

Description

Fin and heat exchanger comprising same

Technical Field

The utility model relates to a heat exchange equipment, in particular to fin and heat exchanger.

Background

The fin flue gas heat exchanger is a device for exchanging heat by utilizing external high-temperature flue gas and low-temperature water, fins are important components, and play an important role in influencing the overall heat exchange effect, in the heat exchanger, cold medium circularly flows in the heat exchange tube, and exchanges heat with the heat exchange tube wall, the fins exchange heat with the high-temperature flue gas, and the laminar flow boundary greatly obstructs the heat exchange between the flue gas and the fins, so the turbulent flow design of the fins directly determines the heat exchange efficiency of the heat exchanger, flat fins are adopted in most of the existing heat exchangers, the heat exchange coefficient of the flat fins is lower, and the heat exchange efficiency of the heat exchanger is difficult to further improve.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a fin can improve the heat exchange efficiency of fin.

The utility model also provides a heat exchanger of having above-mentioned fin.

According to the utility model discloses a fin of first aspect embodiment, including the fin body, be provided with on the fin body: more than two openings are arranged in a linear arrangement; the heat exchange flow channel is arranged between any two adjacent openings and comprises a primary groove and a secondary groove which are sequentially communicated; wherein, one end of the primary groove is at least communicated with one end of the two secondary grooves.

According to the utility model discloses fin has following beneficial effect at least: the fin body is provided with the open pores for inserting the external heat exchange tubes, and the heat exchange flow channel for improving the heat exchange effect is arranged between any two adjacent open pores.

According to some embodiments of the utility model, the one end intercommunication of one-level recess is two the one end of second grade recess. Namely, the flue gas passing through the first-stage groove is divided into two second-stage grooves to form a crotch-shaped divided flow.

According to the utility model discloses a some embodiments, the other end of one-level recess extends to one side of fin body, the other end of second grade recess extends to another avris of fin body. When the flue gas flowed through the fin body promptly, partial flue gas directly got into by the other end of one-level recess, then directly flowed out the fin body from the other end of second grade recess.

According to some embodiments of the utility model, the heat transfer runner still including set up in arch on the fin body is protruding, arch bellied protruding direction with the recessed direction of one-level recess is the same, arch is protruding to be followed the extending direction of one-level recess runs through the setting, arch is located two between the second grade recess. The position between the two secondary grooves is a heat exchange weak area, the arched bulge is arranged at the position of the heat exchange weak area and forms a flaring, and partial flue gas flowing through the fin body passes through the arched bulge, so that the coordination degree of a local area velocity field and a temperature field can be enhanced, and low-resistance heat exchange is realized.

According to some embodiments of the invention, the arch-shaped protrusion height is 2mm to 4 mm. The structure strength and the heat exchange effect of the arch-shaped bulge can be ensured in the range.

According to the utility model discloses a some embodiments, the width of one-level recess is n, arbitrary adjacent two distance between the trompil is n, and the ratio of m and n is 0.4 to 0.6. The width of the first-stage groove is determined by the distance between two adjacent openings, so that a good heat exchange effect is achieved.

According to some embodiments of the present invention, the width of the second-stage groove is l, and the ratio of l to m is 0.7 to 0.8. The width of the secondary grooves is smaller than that of the primary grooves, and the secondary grooves are designed according to the proportion to ensure the structural strength.

According to some embodiments of the utility model, the other end of one-level recess with connect in the one-level recess the distance of the other end of second grade recess is not less than 10 mm. Namely, the distance from the primary groove to the bifurcation point is not less than 10mm, so as to obtain better heat exchange effect.

According to the utility model discloses a heat exchanger of second aspect embodiment, including the heat exchange tube, still include the above-mentioned that a plurality of block align to grid set up the fin, on the fin the trompil is used for supplying the heat exchange tube passes, arbitrary piece the fin the one-level recess the degree of depth of second grade recess is h, and arbitrary two are adjacent distance between the fin is d, and wherein, the ratio of h and d is 0.4 to 0.6.

According to the utility model discloses a heat exchanger has following beneficial effect at least: utilize the fin to arrange the setting, form a flue gas channel between two fins, when the flue gas passes through flue gas channel, partial flue gas can flow in to the heat transfer runner, alternate the heat exchange tube in the trompil internal fixation of every fin, the one-level groove depth and the second grade groove depth homogeneous phase of every fin, the processing of being convenient for, and one-level groove depth, the second grade groove depth and the distance between the arborescent fin of arbitrary two adjacent trompil formulas have certain proportional relation, can obtain better heat transfer effect in this proportional design.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a fin according to an embodiment of the present invention.

A fin body 100,

An opening 200, a primary recess 210, a secondary recess 220, and an arcuate projection 230.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1, in the heat exchanger, including a plurality of fins arranged uniformly, the heat exchange tube is inserted into the opening 200 of each fin to connect and fix the fins, the fins are connected with the heat exchange tube by welding, heat exchange channels are punched on the fins, when the flue gas enters the flue gas channel, the high temperature flue gas and the surfaces of the fins and the heat exchange tube generate heat convection, the heat is transferred to the low temperature water in the heat exchange tube by heat conduction and heat convection, the heat exchange channels include a primary groove 210 and a secondary groove 220 arranged on the fin body 100, the depth of the primary groove 210 and the depth of the secondary groove 220 are set according to the distance between two fins, specifically, the depth of the primary groove 210 and the depth of the secondary groove 220 of any fin are h, the distance between any two adjacent fins is d, and the ratio of h to d is 0.4 to 0.6, and a good heat exchange effect can be achieved under the ratio, in some embodiments, the ratio is 0.5, at which the best heat transfer is achieved.

The fin includes fin body 100, be provided with on the fin body 100: more than two openings 200 arranged in a linear arrangement; the heat exchange flow channel is arranged between any two adjacent openings 200 and comprises a primary groove 210 and a secondary groove 220 which are sequentially communicated; wherein, one end of the primary groove 210 is communicated with at least one end of the two secondary grooves 220.

The fin body 100 is provided with the open pores 200 for inserting the external heat exchange tubes, and the heat exchange flow channel for improving the heat exchange effect is arranged between any two adjacent open pores 200, specifically, when the flue gas passes through the surface of the fin body 100, the first-stage grooves 210 and the second-stage grooves 220 improve the mutual mixing of the high-temperature fluid and the low-temperature fluid, so that the heat exchange effect is improved, especially when the flue gas flows in from the first-stage grooves 210 and flows out from the second-stage grooves 220, the fluid flows through the bifurcation points formed by at least two second-stage grooves 220, and forms a secondary flow near the bifurcation points, namely, the backflow and separation phenomena are generated, the mutual mixing of the high-temperature fluid and the low-temperature fluid is further improved, the secondary flow has higher strength even at a low Reynolds number, and the heat exchange effect of the flue gas flowing through the fin body.

In some embodiments, the primary grooves 210 and the secondary grooves 220 may have a bent extension, which also improves the heat exchange effect of the flue gas flowing through the fin body 100.

In this embodiment, one end of the primary groove 210 is communicated with one end of the two secondary grooves 220. Namely, the flue gas passing through the primary groove 210 is divided into two secondary grooves 220 to form a fork-shaped divided flow. Namely, the flue gas passing through the primary groove 210 is divided into two secondary grooves 220 to form a fork-shaped divided flow. One end of each of the two secondary grooves 220, which is far away from the primary groove 210, extends to the side of the heat exchange tube, which is far away from the primary groove 210, and the structure forms a reduction type flow channel, so that a backflow area of fluid behind the heat exchange tube can be restrained, and friction loss caused by vortex formed by boundary layer separation is reduced.

In this embodiment, the other end of the primary groove 210 extends to one side of the fin body 100, and the other end of the secondary groove 220 extends to the other side of the fin body 100. That is, when the flue gas flows through the fin body 100, part of the flue gas directly enters from the other end of the primary groove 210, and then directly flows out of the fin body 100 from the other end of the secondary groove 220.

In this embodiment, the heat exchange flow channel further includes an arch protrusion 230 disposed on the fin body 100, a protrusion direction of the arch protrusion 230 is the same as a concave direction of the first-stage groove 210, if the first-stage groove 210 and the second-stage groove 220 are disposed on the bottom surface of the fin body 100, the arch protrusion 230 is disposed on the top surface of the fin body 100, the arch protrusion 230 is disposed along an extending direction of the first-stage groove 210, and the arch protrusion 230 is disposed between the second-stage grooves 220. The position between the two secondary grooves 220 is a heat exchange weak area, the arched bulge 230 is arranged at the position of the heat exchange weak area, the arched bulge 230 forms a flaring, and partial flue gas flowing through the fin body 100 passes through the arched bulge 230, so that the coordination degree of a local area velocity field and a temperature field can be enhanced, and low-resistance heat exchange is realized.

In this embodiment, the height of the flare is 3 mm. Under the structural design, the structural strength and the heat exchange effect of the flaring can be optimized.

In this embodiment, the width of the primary groove 210 is n, the distance between any two adjacent openings 200 is n, the ratio of m to n is 0.4, and the optimal heat exchange effect is achieved under the setting of the ratio.

In this embodiment, the width of the secondary groove 220 is l, and the ratio of l to m is 0.7 to 0.8. The secondary grooves 220 have a smaller width than the primary grooves 210 and are designed according to this ratio to ensure structural strength.

In this embodiment, the distance between the other end of the primary groove 210 and the other end of the secondary groove 220 connected to the primary groove 210 is 10 mm. That is, the distance from the first-stage groove 210 to the branching point is 10mm, the heat exchange enhancement effect of the first-stage groove 210 is fully utilized, and the flue gas enters the second-stage groove 220 after the heat exchange effect is weakened, so that the speed is redistributed, and the heat exchange is enhanced again.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (9)

1. A fin, characterized by: including fin body (100), be provided with on fin body (100):

more than two openings (200) which are arranged in a linear arrangement;

the heat exchange flow channel is arranged between any two adjacent openings (200), and comprises a primary groove (210) and a secondary groove (220) which are sequentially communicated;

wherein, one end of the primary groove (210) is communicated with one end of at least two secondary grooves (220).

2. A fin according to claim 1, wherein: one end of the primary groove (210) is communicated with one end of the two secondary grooves (220).

3. A fin according to claim 2, wherein: the other end of one-level recess (210) extends to one side of fin body (100), the other end of second grade recess (220) extends to another avris of fin body (100).

4. A fin according to claim 2, wherein: the heat exchange flow channel further comprises an arch protrusion (230) arranged on the fin body (100), the protrusion direction of the arch protrusion (230) is the same as the concave direction of the first-level groove (210), the arch protrusion (230) is arranged in a penetrating mode along the extending direction of the first-level groove (210), and the arch protrusion (230) is located between the second-level grooves (220).

5. A fin according to claim 4, wherein: the height of the arch-shaped bulge (230) is 2mm to 4 mm.

6. A fin according to claim 2, wherein: the width of the primary groove (210) is n, the distance between any two adjacent open holes (200) is n, and the ratio of m to n is 0.4-0.6.

7. A fin according to claim 6, wherein: the width of the secondary groove (220) is l, and the ratio of l to m is 0.7-0.8.

8. A fin according to claim 2, wherein: the distance between the other end of the primary groove (210) and the other end of the secondary groove (220) connected to the primary groove (210) is not less than 10 mm.

9. A heat exchanger, characterized by: the heat exchange tube comprises a heat exchange tube and further comprises a plurality of fins as set forth in any one of claims 1 to 8, wherein the fins are uniformly arranged, the open holes (200) on the fins are used for the heat exchange tube to pass through, the depth of the primary grooves (210) and the depth of the secondary grooves (220) of any one fin are h, the distance between any two adjacent fins is d, and the ratio of h to d is 0.4-0.6.

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