CN210321337U

CN210321337U - Circular micro-channel wave panel type heat exchanger core and heat exchanger

Info

Publication number: CN210321337U
Application number: CN201920241064.9U
Authority: CN
Inventors: 徐雅岚
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-02-26
Filing date: 2019-02-26
Publication date: 2020-04-14
Anticipated expiration: 2029-02-26

Abstract

The utility model discloses a circular microchannel wave panel heat exchanger core and heat exchanger, wherein, circular microchannel wave panel heat exchanger core includes: the heat exchanger comprises heat exchanger core body frames, a plurality of circular micro-channel wavy-surface heat exchange plates and a plurality of tube plate strips, wherein the circular micro-channel wavy-surface heat exchange plates are alternately stacked and fixed in the two heat exchanger core body frames through the tube plate strips at two ends of a circular micro-channel; each round micro-channel wave surface heat exchange plate is formed by fixedly connecting a plurality of single-layer round micro-channels which are attached side by side, and the inner diameters of the round micro-channels in the same round micro-channel wave surface heat exchange plate are the same. Utilize the utility model discloses a heat exchanger that the heat exchanger core can be made has increased heat transfer surface area on the one hand, and on the other hand, the wave surface passes through the vortex, can change heat transfer boundary layer, makes the heat exchange more abundant.

Description

Circular micro-channel wave panel type heat exchanger core and heat exchanger

Technical Field

The utility model belongs to the technical field of heat exchanger equipment, especially, relate to a circular microchannel wave panel heat exchanger core and heat exchanger.

Background

Common heat exchangers, such as a fin-tube heat exchanger and an aluminum parallel flow microchannel heat exchanger, increase heat exchange area and increase wind disturbance to enhance heat dissipation by arranging fins. Because the fins and the heat exchange tubes are in cross connection, a series of negative effects which influence the heat exchange efficiency, such as difficult defrosting, easy dust accumulation, easy water bridge bridging and the like are generated in use. The aluminum parallel flow micro-channel heat exchanger is rarely used as an evaporator until now because the fins are too dense to affect defrosting. With the use of new green refrigerants, such as CO2, which require the tubing to withstand greater pressures, conventional heat exchangers are difficult to meet.

The common parallel flow heat exchanger mainly comprises a pair of mutually parallel and mutually separated collecting pipes, a plurality of flat pipes, fins and two side plates, wherein the two ends of each flat pipe are communicated with the inner cavities of the two collecting pipes respectively and are mutually parallel, the fins are arranged between the adjacent flat pipes, the two side plates are fixedly connected with the outer side flat pipes through the fins, a plurality of holes used for connecting the flat pipes are formed in the collecting pipes, and the whole heat exchanger is of a flat plate-shaped structure after being assembled. During operation, the refrigerant flows along the flat pipes between the collecting pipes along the design direction, and exchanges heat with air blown through the fins while flowing.

A microchannel parallel flow heat exchanger for transcritical CO2 cycles is disclosed in chinese patent publication No. CN 2800210Y. However, the small holes of the flat tubes in the parallel flow heat exchanger are generated by extrusion, and only aluminum can be used as a material at present. On the other hand, in some cases of high corrosion, high corrosion resistance materials such as copper are required, but the materials such as copper cannot be manufactured into the flat tube by a similar process due to the difference between the hardness and ductility of the materials such as copper and aluminum, so that it is difficult to manufacture the parallel flow heat exchanger using other materials such as copper.

In order to solve the above problems, chinese patent publication No. CN101029808A discloses a round tube parallel flow heat exchanger, which comprises fins, a header pipe, a baffle, a round tube bundle and an inter-tube connector, wherein the round tube bundle is composed of one or more round tubes side by side, two ends of the round tube bundle extend into the inter-tube connector and are fixed in square grooves of the header pipes at two ends through the inter-tube connector, the fins are placed between the parallel round tube bundles, and the round tube bundle and the inter-tube connector, the inter-tube connector and the header pipe, and the fins and the round tube bundle are fixed by welding.

The parallel flow heat exchanger addresses the limitation that the material must be aluminum, however, due to the smaller fin spacing, the heat exchanger is prone to clogging by water droplets and frost layers. When the flat pipe of the micro-channel heat exchanger is horizontally placed, water and frost are easily accumulated on the surface of the flat pipe under the low-temperature working condition; when the flat tube of the micro-channel heat exchanger is vertically placed, frost is easily accumulated on the surface of the fin under the low-temperature working condition. The finned micro-channel heat exchanger has the advantages that the fin structure is omitted, so that the same air side heat exchange area is guaranteed, the tube spacing of the finned micro-channel heat exchanger is at least reduced to 1/4, the prior art is adopted for processing, the minimum tube spacing of the finned micro-channel heat exchanger can only be reduced to 1/2, the heat exchange air side area is obviously reduced, and the same heat exchange area and heat exchange amount cannot be guaranteed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a circular microchannel wave panel heat exchanger core and based on the heat exchanger of this circular microchannel wave panel heat exchanger core, can improve the not enough of prior art, improve heat exchange efficiency.

In order to realize the purpose of the utility model, the utility model provides a following technical scheme:

on the first aspect, the circular micro-channel wave panel type heat exchanger core comprises heat exchanger core body frames, a plurality of circular micro-channel wave surface heat exchange plates and a plurality of tube plate strips, wherein the plurality of circular micro-channel wave surface heat exchange plates are alternately stacked and fixed in the two heat exchanger core body frames through the tube plate strips at the two ends of the circular micro-channel;

each round micro-channel wave surface heat exchange plate is formed by fixedly connecting a plurality of single-layer round micro-channels which are attached side by side, and the inner diameters of the round micro-channels in the same round micro-channel wave surface heat exchange plate are the same.

The inner diameters of the circular micro-channels on different circular micro-channel wave panels in the core body of the circular micro-channel wave panel type heat exchanger can be the same or different. The inner diameter of the micro-channel of the circular micro-channel wave panel type heat exchanger core body can be one or a combination of several types, so that the advantage is that when the fluid in the pipe has phase change, the problem that the volume is changed greatly after the phase change and needs corresponding inner volume is solved creatively in different processes.

The utility model discloses in, the circular microchannel that the heat transfer board was hugged closely by each other constitutes, and circular microchannel has constituted a plurality of crests and trough on the heat transfer board surface for the surface of heat transfer board is the wave, and the line of the centre of a circle of circular microchannel and adjacent trough, crest locates to become the right angle in the centre of a circle. On the one hand, the heat exchange surface area of the wave-surface heat exchange plate of the circular micro-channel is maximized, and the best heat exchange effect is achieved. The surface of the heat exchange plate is smooth, dust and water are not easy to accumulate, defrosting is easy, and long-time efficient heat exchange is facilitated.

The utility model discloses in, the pipe lath is the burnishing surface with the connection face of circular microchannel, need not set up the recess. The difficult problem that the microchannel tube penetrates through a thick plate to be connected is creatively solved through the connection between the wave surface heat exchange plate and the tube plate strip (the microchannel tube is very thin, the tube plate is thicker, the thickness of the plate is far larger than the outer diameter of the tube, and a thin hole is very difficult to drill on the thick plate). The tube strip may be in the shape of a flat strip, a corrugated strip, a broken strip, a wedge strip or the like. By changing the shape of the tube sheet strip, the shape of the heat exchanger plate can be controlled.

When the inner diameter of the circular microchannel is smaller, the connection surface of the pipe lath and the circular microchannel is a flat surface, so that a better sealing effect can be achieved between the pipe lath and the wave trough of the circular microchannel.

When the inner diameter of the circular microchannel is larger, in order to achieve better sealing effect between the pipe lath and the wave trough of the circular microchannel, a plurality of side-by-side semicircular grooves matched with the circular microchannel can be arranged on the pipe lath.

The corrugated plate strip is preferably a corrugated plate strip, the forming of the corrugated plate strip is based on the optimal heat exchange shape obtained by Computer Fluid Dynamics (CFD) simulation according to the use condition of the heat exchanger, the bending section is angled at an angle α, the angle is between 0 and 75 degrees, and the appropriate bending angle is selected according to the flow velocity.

In order to ensure that the liquid distribution between the circular micro-channel wavy surface heat exchange plates on different layers is more uniform, pipe battens extend out of two ends of each circular micro-channel wavy surface heat exchange plate, the extending parts are flush, and the length of the extending parts is 0.1-10 mm.

In order to improve the heat exchange effect, in the utility model, the thickness of the pipe lath is 0.2-15mm, and the width is 1-40 mm; the inner diameter of the circular micro-channel is 0.1-4mm, the wall thickness is 0.02-0.4mm, the micro-channel effect is obvious, the wall of the inner diameter tubule is thin, and the heat exchange efficiency is high; and because the pipe diameter is thin, the pressure-bearing is high. Further preferably, the inner diameter of the circular microchannel is 0.1 to 1.5 mm.

The utility model discloses in, the material of circular microchannel wave face heat transfer board, tube sheet strip, heat exchanger core frame can be stainless steel, alloy material or non-metallic material, is fit for high temperature resistant, abominable operating mode environment such as corrosion-resistant.

When the material is stainless steel or alloy, the whole heat exchanger core can be manufactured by a welding process; when the material is nonmetal such as pottery, whole heat exchanger core still can be printed the preparation through 3D and become.

According to different requirements, the cross section of the heat exchanger core frame can be a circular ring, an elliptical ring, a rectangular ring or other polygonal rings, and can also be arranged into other irregular rings according to the shape of the tube plate strip.

In order to further increase the heat exchange effect, a plurality of fins are further arranged on the circular micro-channel wavy-surface heat exchange plate, and the fins are parallel to the radial direction of the circular micro-channel and are tightly and fixedly connected with the circular micro-channel. The number of the fins can be determined according to the requirement, and the fins can be arranged at intervals between a single round micro-channel and the fins, or the fins can be arranged at intervals between a plurality of round micro-channels.

In a second aspect, the round micro-channel wave panel type heat exchanger comprises a liquid collecting pipe and the core body of the round micro-channel wave panel type heat exchanger,

the two ends of the core body of the round micro-channel wave panel type heat exchanger are respectively connected with a liquid collecting pipe; a plurality of flow baffles are respectively arranged in the liquid collecting pipes at two sides, or a flow baffle is arranged in the liquid collecting pipe at one side, or the flow baffles are not arranged in the liquid collecting pipes at two sides;

when the liquid collecting pipe is internally provided with the flow baffle, the flow baffle divides the interior of the liquid collecting pipe into a plurality of flows, and the liquid collecting pipe is provided with a fluid inlet and a fluid outlet.

This heat exchanger is air-cooled heat exchanger, can place the heat exchanger is vertical during the use, and the water droplet that the condensation produced on the circular microchannel this moment can flow downwards under the action of gravity to avoid staying between the heat transfer board, lead to the heat exchanger to be blockked up by the water droplet easily.

Preferably, in the liquid collecting pipe, a plurality of liquid homogenizing covers (including each liquid inlet or only each liquid inlet) are arranged at the position of the circular microchannel liquid inlet of at least one process, the liquid homogenizing covers divide the circular microchannel liquid inlet in the same process into a plurality of small chambers, and a plurality of liquid homogenizing holes are formed in the liquid homogenizing covers. By adding the liquid separation cover, liquid separation among different circular microchannels can be more uniform.

The circular micro-channel corrugated panel type heat exchanger core can be manufactured by two methods. The first manufacturing method includes the steps of:

(1) coating solder on a welding area of the tube plate strip, closely attaching a plurality of micro-channel metal circular tubes in parallel, clamping two ends of each micro-channel metal circular tube by a pair of tube plate strips with the solder, and extending two ends of each micro-channel metal circular tube out of the tube plate strips;

(2) after each pair of pipe strips is pre-fixed, coating solder resist on the micro-channel metal circular pipes on two sides of a welding area of the pipe strips and performing integral welding to obtain a circular micro-channel wave surface heat exchange plate;

(3) manufacturing a plurality of round micro-channel wavy-surface heat exchange plates matched with the frame of the heat exchanger core body by using the method;

(4) arranging two heat exchanger core body frames with inner walls coated with welding fluxes at intervals, cutting and trimming tube plate strips of the round micro-channel wavy-surface heat exchange plates, coating the welding fluxes on the surfaces of the tube plate strips, sequentially laminating the tube plate strips in the two arranged heat exchanger core body frames, enabling two ends of the tube plate strips to be attached to the inner walls of the heat exchanger core body frames, and integrally welding to obtain an initial heat exchanger core body;

(5) and cutting and trimming the initial heat exchanger core body to obtain the circular micro-channel wave panel type heat exchanger core body.

In order to more conveniently enable the micro-channel metal round tubes to be mutually attached and have better attaching effect, in the step (1), before the welding area is coated with the solder, the method further comprises the step of arranging bulges at two ends of the welding area of at least one tube plate strip, wherein the height of the bulges is smaller than the outer diameter of the micro-channel metal round tubes.

In order to improve the overall welding effect of the round microchannel heat exchange plate and prevent pores from being formed between the tube plate strip and the microchannel metal circular tube, in the step (2), after each pair of tube plate strips is pre-fixed, a mixture of powder and welding flux which is consistent with the metal base material is spot-coated on the gap between the microchannel metal circular tube and the tube plate strip.

When the circular micro-channel wavy panel type heat exchanger core body is provided with fins, in the manufacturing process, in the step (1), the fins are arranged between the plurality of micro-channel metal round tubes in a clinging manner, and the two ends of each of the micro-channel metal round tubes and the fins extend out of the tube laths; in the step (2), after each pair of tube strips is pre-fixed, solder resists are coated on the fins on two sides of a welding area of the tube strips; and spot-coating a mixture of powder and solder consistent with the metal base material on the gap between the round microchannel metal tube and the tube plate strip and the gap between the fin and the tube plate strip.

Another method of manufacture, comprising:

(1') coating welding fluxes on a welding area on the inner side of a frame of the heat exchanger core and a welding area of a pipe plate strip, tightly attaching a plurality of micro-channel metal circular pipes in parallel, respectively clamping two ends of each micro-channel metal circular pipe by a pair of pipe plate strips with the welding fluxes to form a first layer of circular micro-channel layer, extending two ends of each micro-channel metal circular pipe out of the pipe plate strip, and attaching two ends of each pipe plate strip to the inner wall of the frame of the heat exchanger core;

(2') coating solder resists on the micro-channel metal circular tubes on two sides of the welding area of the tube plate strip; coating a mixture of powder and solder consistent with the metal base material on a gap between the micro-channel metal round pipe and the pipe plate strip;

(3') after the pipe plate strip pairs are pre-fixed, repeatedly coating welding flux on the pipe plate strips, paving a plurality of metal circular pipes to form a plurality of circular micro-channel layers, and finally integrally welding the circular micro-channel layers with the frame of the heat exchanger core to obtain an initial heat exchanger core;

and (4') cutting and trimming the initial heat exchanger core body to obtain the circular micro-channel wave panel type heat exchanger core body.

When the circular micro-channel wavy panel type heat exchanger core body is provided with fins, in the manufacturing process, in the step (1'), the fins are arranged among the plurality of micro-channel metal round pipes in a clinging manner, and the pipe laths extend out of two ends of each of the micro-channel metal round pipes and the fins; in the step (2'), after each pair of tube plates is pre-fixed, solder resists are coated on the fins on two sides of a welding area of the tube plates, and powder and solder mixtures consistent with the metal base material are spot-coated on gaps between the fins and the tube plates.

According to the two manufacturing methods of the circular micro-channel wave panel type heat exchanger core body, the outer diameter of the circular micro-channel is very small, so that the wave trough between the circular micro-channels can be filled after the welding flux is melted, and the pipe plate strip and the circular micro-channel are naturally sealed. The two ends of the circular micro-channel extend out of the tube plate strips, the process length is reserved, and after each pair of tube plate strips is pre-fixed, solder resists are coated on the circular micro-channels on the two sides of a welding area of the tube plate strips, so that when the whole welding is prevented, the solder is subjected to capillary action to cause solder loss, the connection line of the circle center of the circular micro-channel on the wave surface heat exchange plate of the circular micro-channel and the adjacent wave trough and wave crest can keep a 90-degree right angle at the circle center, and the heat exchange area is maximized. The whole manufacturing method is simple and easy to operate, ensures that the minimum pipe spacing is reduced, simultaneously ensures that the manufactured circular micro-channel is not deformed, has high flatness, solves the problem of high welding difficulty of the circular micro-channel, and simultaneously can use pipe laths in different shapes as required to increase the heat exchange effect.

Compared with the prior art, the utility model discloses following technological effect has:

1. the utility model discloses an among the circular microchannel wave panel heat exchanger, the heat transfer board of the heat exchanger core hugs closely the constitution each other by the circular microchannel of a plurality of, and the surface of heat transfer board is the wave, has increased the heat transfer surface area on the one hand, and on the other hand, the wave surface passes through the vortex, can change the heat transfer boundary layer, makes the heat exchange more abundant. Meanwhile, the circular microchannels are firstly mutually attached to form a heat exchange plate and then are stacked and fixed to form the microchannel heat exchanger core, so that the pressure bearing capacity of the heat exchanger core is improved.

2. The utility model discloses a circular microchannel wave panel heat exchanger core has saved the fin between circular microchannel wave face heat transfer plate, and sets up the fin between circular microchannel to solved it when being used for air-cooled heat exchanger, the problem of heat transfer plate surface ponding and long-pending frost easily under the low temperature operating mode.

Drawings

Fig. 1 is a schematic structural diagram of a circular microchannel wave panel heat exchanger core in embodiment 1 of the present invention;

FIG. 2 is a left side view of the heat exchanger core of FIG. 1;

FIG. 3 is a front view of the heat exchanger core of FIG. 1;

FIG. 4 is a schematic view of one of the heat exchange plates of the microchannel heat exchanger core of FIG. 1;

fig. 5 is a schematic view of a heat exchanger core body when a pipe lath is a corrugated plate in embodiment 1 of the present invention;

fig. 6 is a schematic view of a heat exchanger core body when a pipe lath is a wire folding plate in embodiment 1 of the present invention;

fig. 7 is a schematic view of a heat exchanger core body in the case that a pipe lath is a wedge-shaped plate according to embodiment 1 of the present invention;

fig. 8 is a schematic structural view of a circular microchannel wave panel heat exchanger according to embodiment 2 of the present invention;

fig. 9 is a schematic view of a liquid-equalizing cover in embodiment 2 of the present invention.

Detailed Description

The invention will be described in further detail with reference to the following figures and examples, which are intended to facilitate the understanding of the invention without limiting it.

Example 1

As shown in fig. 1 to 3, a circular micro-channel corrugated panel type heat exchanger core is formed by alternately stacking and fixing a plurality of circular micro-channel corrugated panel heat exchange plates in two heat exchanger core frames 21 through tube plate strips 2. The structure of each round microchannel wave surface heat exchange plate is shown in fig. 4, and comprises a plurality of round microchannels 1, the round microchannels 1 are arranged in a mutual clinging manner, two ends of each round microchannel 1 are respectively clamped and fixed by two tube plate strips 2, and a bulge 3 is arranged between the tube plate strips 2 and used for keeping the round microchannels 1 tightly attached to each other.

The round micro-channel wavy-surface heat exchange plates are mutually stacked and fixed through the tube plate strips 2 at the two ends of the round micro-channel 1, the two ends of the round micro-channel 1 extend out of the tube plate strips 2 for a certain length, and the extending parts are flush. As shown in fig. 2, the surface of the heat exchange plate with the wavy surface of the circular microchannel forms a plurality of wave crests and wave troughs, so that the surface of the heat exchange plate is wavy, and when the circular microchannel 1 is clamped by the tube plate bars 2, the tube plate bars 2 are sealed with the wave troughs on the surface of the heat exchange plate.

The tube plate strips 2 between the circular micro-channel wavy-surface heat exchange plates shown in fig. 1 to 3 are single-layer, which is equivalent to laying the tube plate strips 2 and a plurality of circular micro-channels 1 at intervals.

Alternatively, the tube plate strip 2 may be formed by two layers which are stacked and fixed, which is equivalent to that a plurality of circular micro-channels 1 are fixed by a pair of tube plate strips 2 to form a circular micro-channel corrugated surface heat exchange plate, referring to fig. 4, and then the plurality of circular micro-channel corrugated surface heat exchange plates are stacked to fix the tube plate strips 2 which are stacked with each other.

In this embodiment, the tube sheet 2 is a flat plate, and optionally, the tube sheet 2 may also be a wave plate, a broken line plate or a wedge plate. When the tube plate strip 2 is a wave plate strip, the round micro-channel wave panel type heat exchanger core body is shown in figure 5; when the tube sheet is a broken line sheet, the round micro-channel wave panel heat exchanger core is shown in fig. 6, and when the tube sheet is a wedge-shaped sheet, the round micro-channel wave panel heat exchanger core is shown in fig. 7.

As shown in fig. 2, 5, 6 and 7, the wave crests of two adjacent round microchannel wave surface heat exchange plates are opposite to the wave crests. The utility model discloses be not limited to this kind of mode of arranging as shown in the figure, optionally, the crest of two adjacent circular microchannel wave surface heat transfer plates can also just right with the trough, perhaps the crest is just right with partial trough.

In order to further increase the heat exchange effect, a plurality of fins can be further arranged on the wave-surface heat exchange plate of the circular micro-channel, and the fins are parallel to the radial direction of the circular micro-channel 1 and are tightly and fixedly connected with the circular micro-channel 1. The number of the fins can be determined according to the needs, and the fins can be arranged at intervals between a single circular microchannel 1 and the fins, or the fins can be arranged at intervals between a plurality of circular microchannels 1.

The embodiment also provides two manufacturing methods of the core body of the circular microchannel corrugated panel type heat exchanger, and the first manufacturing method comprises the following steps:

(1) after the two ends of the welding area of the tube plate strip are provided with the bulges, welding flux is coated in the welding area; two ends of a plurality of micro-channel metal round tubes are respectively clamped through a pair of tube plate strips with welding fluxes, the micro-channel metal round tubes are mutually attached, the two ends of each micro-channel metal round tube extend out of the tube plate strips, and a certain process length is reserved.

(2) After each pair of tube plates are pre-fixed by spot welding, a mixture of powder and solder which is consistent with the material of the metal round tube is spot-coated on a gap between the metal round tube of the micro-channel and the tube plate; and coating solder resist on the micro-channel metal circular tubes on two sides of the welding area of the tube plate strip and performing integral welding to obtain the circular micro-channel wavy-surface heat exchange plate.

(5) and cutting and trimming the initial heat exchanger core body to obtain the circular micro-channel wave panel type heat exchanger core body. The cutting and trimming comprises the step of cutting the two ends of the micro-channel metal round pipe extending out of the pipe plate strip and the two ends of the pipe plate strip, so that the parts of the two ends of the micro-channel metal round pipe extending out of the pipe plate strip are flush, and the length of the extending parts is 1-10 mm.

The steps of the second manufacturing method are as follows:

Example 2

This example is a heat exchanger utilizing the round microchannel corrugated panel heat exchanger core of example 1. As shown in fig. 8, the two ends of the core body of the circular micro-channel wave panel heat exchanger are respectively connected with the liquid collecting pipes 4, and the liquid collecting pipes 4 on the two sides are provided with the flow baffle plates 5 fixed with the tube plate strips 2 of the core body of the micro-channel circular tube heat exchanger. The flow baffle 5 divides the interior of the liquid collecting pipe 4 into a plurality of flows, and the liquid collecting pipe is provided with a fluid inlet and a fluid outlet.

In order to make the liquid separation between the different heat exchange plates and between the different circular microchannels 1 more uniform, in the liquid collecting pipe 4, the circular microchannel liquid inlet of each flow is provided with a plurality of liquid homogenizing covers 6, the liquid homogenizing covers 6 divide the liquid inlet of the circular microchannel 1 in the same flow into a plurality of small chambers, and the liquid homogenizing covers 6 are provided with a plurality of liquid homogenizing holes 7, see fig. 9.

The heat exchanger in this embodiment is an air-cooled heat exchanger, and when in use, two sets of fluids (such as refrigerant and air) that need to exchange heat are introduced from the opening of the header pipe 4 at one end along the direction indicated by the arrow in fig. 8, and are distributed into the circular microchannel 1 of the heat exchange plate through the deflection of the flow baffle 5, and thus flow out from the opening of the header pipe 4 at the other end after passing through a plurality of flows.

The optimal mode of placing when the heat exchanger of this embodiment uses is vertical placing, and the water droplet that the condensation produced on microchannel pipe 1 this moment can flow downwards under the action of gravity to avoid staying between the heat transfer plate, lead to the heat exchanger to be blockked up by the water droplet easily.

In the heat exchanger, the heat transfer plate comprises circular microchannel 1 that hugs closely each other, and circular microchannel 1 on heat transfer plate surface has constituted a plurality of crests and trough for the surface of heat transfer plate is the wave, has increased the heat transfer surface area on the one hand, and on the other hand, the wave surface passes through the vortex, can change the heat transfer boundary layer, makes the heat exchange more abundant. The air can sufficiently exchange heat with the surface of the circular microchannel 1 while passing through the flow passages between the heat exchange plates.

Meanwhile, the tube plate strips 2 in the circular micro-channel wave panel type heat exchanger core body can be flat plate strips, wave plate strips, broken line plate strips or wedge-shaped plate strips. The circular micro-channel wave panel type heat exchanger core with different tube plate strips 2 can be selected according to different requirements. When the pipe lath 2 is a wave plate or a broken line plate, the turbulent flow generated when the fluid flows can be further increased, so that the heat exchange is more sufficient.

According to the flow velocity of the air, the bending angle of the wave-shaped lath and the broken-line lath can be properly selected, so that the heat exchange efficiency is optimal. The relationship between the specific bending angle and the wind speed is as follows: when the wind speed is more than 3 m/s, the bending angle is between 0 and 20 degrees; when the wind speed is 2-3 m/s, the bending angle is 15-30 degrees; the bending angle is between 30 and 45 degrees when the wind speed is between 1.5 and 2 m/s; the bending angle is between 45 and 60 degrees when the wind speed is 1-1.5 m/s; the bending angle is between 60 and 75 degrees when the wind speed is more than 0.5-1 m/s.

The above-mentioned embodiment is to the technical solution and the beneficial effects of the present invention have been described in detail, it should be understood that the above is only the specific embodiment of the present invention, not used for limiting the present invention, any modification, supplement and equivalent replacement made within the principle scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A circular micro-channel wave panel type heat exchanger core is characterized by comprising heat exchanger core frames, a plurality of circular micro-channel wave surface heat exchange plates and a plurality of tube plate strips, wherein the plurality of circular micro-channel wave surface heat exchange plates are alternately stacked and fixed in the two heat exchanger core frames through the tube plate strips at the two ends of the circular micro-channel;

2. The circular microchannel corrugated panel heat exchanger core of claim 1, wherein the tube sheet strip is a flat sheet strip, a corrugated sheet strip, a broken sheet strip, or a wedge-shaped sheet strip.

3. The circular microchannel wave panel heat exchanger core of claim 2, wherein when the tube sheet is a wave sheet, the angle of the wave sheet bend is 0-75 degrees.

4. The circular microchannel wave panel heat exchanger core as claimed in claim 1, wherein the tube sheet strips are provided with a plurality of side-by-side semicircular grooves matching the circular microchannels.

5. The core body of the round microchannel corrugated panel heat exchanger of claim 1, wherein the two ends of the round microchannel corrugated panel heat exchanger plate extend out of the tube sheet strip, the extension parts are flush, and the length of the extension parts is 0.1-10 mm.

6. The circular microchannel corrugated panel heat exchanger core as claimed in claim 1, wherein the tube sheet strips have a thickness of 0.2-15mm and a width of 1-40 mm.

7. The circular microchannel wave panel heat exchanger core of claim 1, wherein the circular microchannels have an inner diameter of 0.1 to 4mm and a wall thickness of 0.02 to 0.4 mm.

8. The circular microchannel wave panel heat exchanger core as claimed in claim 1, wherein the frame of the heat exchanger core is circular, elliptical, rectangular or polygonal in cross-section.

9. The core body of the circular microchannel wave panel heat exchanger of claim 1, wherein the connection line between the center of the circular microchannel and the adjacent trough and crest on the circular microchannel wave panel heat exchanger is at right angle.

10. The core body of the round microchannel wavy panel heat exchanger of claim 1, wherein the round microchannel wavy panel heat exchange plate is further provided with fins parallel to the radial direction of the round microchannel and tightly attached to the round microchannel.

11. A circular micro-channel wave panel heat exchanger, which is characterized by comprising a liquid collecting pipe and a circular micro-channel wave panel heat exchanger core body as claimed in any one of claims 1 to 10, wherein two ends of the circular micro-channel wave panel heat exchanger core body are respectively connected with the liquid collecting pipe; a plurality of flow baffles are respectively arranged in the liquid collecting pipes at two sides, or a flow baffle is arranged in the liquid collecting pipe at one side, or the flow baffles are not arranged in the liquid collecting pipes at two sides;

12. The round microchannel wave panel heat exchanger as claimed in claim 11, wherein the liquid collecting pipe is provided with a plurality of liquid homogenizing covers at the inlet of the round microchannel in at least one process, the liquid homogenizing covers divide the liquid inlet of the round microchannel in the same process into a plurality of small chambers, and the liquid homogenizing covers are provided with a plurality of liquid homogenizing holes.