Micro-channel flat tube

Abstract

The utility model belongs to the technical field of heat exchangers, particularly relates to a micro-channel flat tube, and solves the problem that the heat exchange efficiency of an outer channel and the heat exchange efficiency of an inner channel are different, so that the maximization of the overall heat exchange efficiency is not facilitated. The micro-channel flat tube comprises a tube body, at least three axially-penetrating micro-channels are arranged in the tube body in the width direction, an arc-shaped side wall is arranged on the width side of the tube body, and each micro-channel comprises two outer channels located on the two sides and a plurality of inner channels located between the two outer channels. The width of the inner channel is larger than that of the outer channel. The heat exchange capacity of the inner channel and the outer channel is balanced, and the overall heat exchange efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to heat exchanger technical field, especially relates to a microchannel flat tube. BACKGROUND

[0002] The microchannel flat tube is a very important part of the heat exchange device, wherein a plurality of microchannels are generally arranged for the flow of heat exchange medium and have high heat and mass transfer characteristics.

[0003] In the microchannel flat tube, one side of the outer channel is adjacent to the inner channel, and the other side is connected to the outside through the side wall; and both sides of the inner channel are adjacent to other microchannels. Therefore, under the condition of the same cross-sectional area, the heat exchange efficiency of the outer channel is higher, resulting in a large difference in the temperature of the heat exchange medium compared with the inner channel.

[0004] In the prior art, most flat tubes have the same width of the microchannels, i.e., the cross-sectional area is basically the same, which cannot balance the heat exchange efficiency of the inner channel and the outer channel and is not conducive to the maximization of the heat exchange efficiency. INVENTION CONTENTS

[0005] The utility model aims at the above problems existing in the prior art and provides a microchannel flat tube.

[0006] In order to achieve the purpose of the utility model, the following technical solutions can be used:

[0007] A microchannel flat tube comprises a tube body, at least three axial microchannels are arranged in the tube body along the width direction, arc-shaped side walls are arranged on the width sides of the tube body, the microchannels comprise two outer channels arranged on both sides and a plurality of inner channels arranged between the two outer channels, and the width of the inner channels is greater than the width of the outer channels.

[0008] The microchannel flat tube of the utility model takes a strip-shaped tube body as the main body, the microchannels are arranged in the tube body for the flow of heat exchange medium, the heat exchange medium exchanges heat with the outside air through the tube wall during the flow process, and when viewed along the arrangement direction, the microchannels can be divided into outer channels arranged at both ends and inner channels arranged at the middle position. For the inner channels, both width sides thereof are adjacent to other microchannels, and for the outer channels, one side thereof is adjacent to the inner channels and the other side thereof is connected to the outside through the arc-shaped side walls. Therefore, under the condition of the same cross-sectional area, the heat exchange capacity of the outer channels is stronger than that of the inner channels, and during the heat exchange process, the temperature of the outer channels is closer to the temperature of the outside air than that of the inner channels. The heat conduction capacity is positively correlated with the temperature difference. Based on this, the width of the outer channels is arranged to be smaller than that of the inner channels, which balances the heat exchange efficiency of the outer channels and the inner channels to some extent and ensures that the temperature change of the heat exchange medium passing through the microchannels is basically consistent.

[0009] As an illustration, the width direction mentioned herein is the width direction of the tube body, i.e. the arrangement direction of the micro-channels, the height direction is the thickness direction of the tube body, and the length direction is the axial direction of the tube body.

[0010] In the micro-channel flat tube mentioned above, the micro-channels are provided with axially extending strip-shaped protrusions on the bottom surface and / or the top surface, and the height of the strip-shaped protrusions is less than the height of the micro-channels.

[0011] The strip-shaped protrusions arranged in the micro-channels are beneficial to increase the contact area with the heat exchange medium, and also beneficial to improve the compression resistance in the thickness direction, and particularly applicable to the processing requirement of bending the flat tube to avoid the micro-channels being flattened and blocked during the bending process. In addition, there is a certain gap between the height end of the strip-shaped protrusion and the opposite bottom surface or top surface of the micro-channel, which reduces the influence of the strip-shaped protrusion on the flow rate of the heat exchange medium, and the unconnected mode can further increase the contact surface of the height end with the heat exchange medium.

[0012] In the micro-channel flat tube mentioned above, the adjacent micro-channels are separated by a rib plate, and a plurality of strip-shaped through grooves are arranged on the rib plate.

[0013] The strip-shaped through grooves arranged on the rib plate can communicate the micro-channels, and the heat exchange efficiency of the micro-channels may be different due to the dirt on the outer wall, the wind shielding, etc. Therefore, the temperature of the heat exchange medium in the micro-channels may be different, and the heat transfer efficiency is related to the temperature difference. At this time, due to the heat diffusion principle, the heat exchange medium with different temperatures can flow between the micro-channels to make them uniform, which helps to fully utilize the high-efficiency micro-channels and improve the heat exchange efficiency.

[0014] In the micro-channel flat tube mentioned above, the strip-shaped protrusions and the strip-shaped through grooves are arranged in the axial direction, and the strip-shaped through grooves and the strip-shaped protrusions correspond to each other in the axial position.

[0015] The strip-shaped through grooves are located on the width side of the strip-shaped protrusions, which can compensate for the reduction of the flow cross-sectional area caused by the arrangement of the strip-shaped protrusions, and ensure the efficient flow of the heat exchange medium.

[0016] In the micro-channel flat tube mentioned above, the thickness of the strip-shaped protrusions is adapted to the thickness of the rib plate, at least a flow guide part is arranged at the upstream end of the strip-shaped protrusions, the flow guide part extends along the height direction of the strip-shaped protrusions, and the cross section is triangular or arc-shaped.

[0017] The thickness of the strip-shaped convex is same as the rib plate, and the cross-sectional area of the strip-shaped through groove is adapted to the cross-sectional area of the strip-shaped convex, which is beneficial to ensure that the flow capacity of the heat exchange medium at different axial positions is substantially same, and the flow guide part on the strip-shaped convex has an inclined surface or an arc surface which is inclined from both sides to the middle, so as to guide the heat exchange medium to the strip-shaped through groove and improve the flow efficiency. As a more refined optimization, the sum of the cross-sectional areas of all the strip-shaped convexes and the sum of the cross-sectional areas of all the strip-shaped through grooves are designed to be same in the cross section.

[0018] In the above micro-channel flat tube, the strip-shaped convexes of adjacent micro-channels are arranged on the bottom surface and the top surface respectively.

[0019] The strip-shaped convexes are uniformly distributed on the top and bottom, so as to ensure that the contact areas of the bottom surface and the top surface of the tube body with the heat exchange medium are substantially same, and improve the heat exchange efficiency.

[0020] As a specific size optimization, the width of the inner channel is between 4.01-4.11 mm, and the width of the outer channel is between 3.75-3.85 mm.

[0021] Alternatively, the width of the inner channel is between 4.41-4.51 mm, and the width of the outer channel is between 4.38-4.48 mm.

[0022] Alternatively, the width of the inner channel is between 5.37-5.47 mm, and the width of the outer channel is between 5.06-5.16 mm.

[0023] As a specific size optimization, the thickness of the rib plate is between 0.3-0.5 mm.

[0024] As a specific size optimization, the tube body is provided with an arc-shaped side wall on both width sides, the thickness of the arc-shaped side wall is between 0.65-1.05 mm, and the radius of the arc-shaped side wall is between 0.5-0.65 mm.

[0025] As a specific size optimization, the micro-channel is provided with an inner chamfer, and the radius of the inner chamfer is between 0.15-0.25 mm.

[0026] As a specific size optimization, the thickness of the tube body is between 1.95-2.05 mm, and the height of the micro-channel is between 1.15-1.25 mm.

[0027] Compared with the prior art, the micro-channel flat tube has the following advantages:

[0028] 1. The width of the outer channel of the micro-channel flat tube is smaller than the width of the inner channel, which balances the heat exchange efficiency of the outer channel and the inner channel to some extent, and ensures that the temperature change of the heat exchange medium passing through each micro-channel is substantially same.

[0029] 2. The strip-shaped convex body is arranged in the micro-channel, which is beneficial to increase the contact area with the heat exchange medium, and is also beneficial to improve the compression resistance in the thickness direction, and is especially suitable for the processing requirement of bending the flat tube, so as to avoid the micro-channel from being compressed and blocked in the bending process. In addition, there is a certain gap between the height end of the strip-shaped convex body and the opposite bottom surface or top surface of the micro-channel, which reduces the influence of the strip-shaped convex body on the flow rate of the heat exchange medium, and the non-connected mode can further increase the contact surface between the height end surface and the heat exchange medium.

[0030] 3. The strip-shaped through slot arranged on the rib plate can communicate the micro-channels, which is beneficial to fully utilize the high-efficiency micro-channel and improve the heat exchange efficiency.

[0031] 4. The strip-shaped through slot is located on the width side of the strip-shaped convex body, which can compensate for the reduction of the flow cross-sectional area caused by the arrangement of the strip-shaped convex body, and ensure the efficient flow of the heat exchange medium.

[0032] 5. The strip-shaped convex bodies are uniformly distributed on the upper and lower parts, so as to ensure that the contact areas of the bottom surface and the top surface of the tube body with the heat exchange medium are basically the same, and improve the heat exchange efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic view of the cross section of embodiment 1 provided by the utility model;

[0034] Figure 2 is a schematic view of the size of embodiment 1 provided by the utility model;

[0035] Figure 3 is a schematic view of the cross section of embodiment 2 through the strip-shaped through slot provided by the utility model;

[0036] Figure 4 is a schematic view of the cross section of embodiment 2 without passing through the strip-shaped through slot provided by the utility model;

[0037] Figure 5 is a schematic view of the longitudinal section of embodiment 2 provided by the utility model;

[0038] Figure 6 is a schematic view of the size of embodiment 2 provided by the utility model;

[0039] Figure 7 is a schematic view of the size of embodiment 3 provided by the utility model.

[0040] In the drawing, the tube body 1, the arc-shaped side wall 2, the micro-channel 3, the outer channel 4, the inner channel 5, the strip-shaped convex body 6, the rib plate 7, the strip-shaped through slot 8 and the flow guide part 9. DETAILED DESCRIPTION

[0041] The technical scheme of the utility model will be further described in combination with the drawings and embodiments of the utility model, but the utility model is not limited to these embodiments.

[0042] Embodiment 1

[0043] The specific implementation such as Figure 1 、 2 As shown in the figure, the micro-channel flat tube comprises a tube body 1, 6 axial through micro-channels 3 are arranged in the tube body 1 along the width direction, the width side of the tube body 1 is provided with an arc-shaped side wall 2, the micro-channel 3 comprises two outer channels 4 located on both sides and a plurality of inner channels 5 located between the two outer channels 4, and the width of the inner channel 5 is greater than the width of the outer channel 4.

[0044] Specifically, the width of the outer channel 4 is less than the width of the inner channel 5, which balances the heat exchange efficiency of the outer channel 4 and the inner channel 5 to a certain extent, and ensures that the temperature change of the heat exchange medium passing through each micro-channel 3 is basically consistent.

[0045] In this embodiment, the total thickness of the tube body 1 is 2mm, the total width is 36mm, the upper and lower wall thickness of the tube body 1 is 0.45mm; the width of the inner channel 5 is 5.42mm, the width of the outer channel 4 is 5.11, the inner chamfer radius of the micro-channel 3 is 0.2mm; the thickness of the rib plate 7 is 0.42mm, and the thickness of the arc-shaped side wall 2 is 1mm.

[0046] Embodiment 2

[0047] The specific working principle of this embodiment is basically the same as that of embodiment 1, and the difference lies in that a strip-shaped convex body 6 and a strip-shaped through slot 8 are further arranged in the tube body 1.

[0048] The specific implementation such as Figures 3-5 As shown in the figure, the top surface and the bottom surface of adjacent micro-channels 3 are respectively provided with an axially extending strip-shaped convex body 6, and the height of the strip-shaped convex body 6 is less than the height of the micro-channel 3. The adjacent micro-channels 3 are separated by a rib plate 7, and a plurality of strip-shaped through slots 8 are arranged on the rib plate 7. The strip-shaped convex body 6 and the strip-shaped through slot 8 are arranged in the axial direction, and the strip-shaped through slot 8 and the strip-shaped convex body 6 correspond to each other in the axial position.

[0049] Specifically, the strip-shaped convex body 6 is arranged in the micro-channel 3, which is beneficial to increase the contact area with the heat exchange medium, and is also beneficial to improve the compression resistance in the thickness direction, and is particularly suitable for the processing requirement of bending the flat tube, so as to avoid the micro-channel 3 from being flattened and blocked during the bending process. In addition, there is a certain gap between the height end of the strip-shaped convex body 6 and the opposite bottom surface or top surface of the micro-channel 3, which reduces the influence of the strip-shaped convex body 6 on the flow rate of the heat exchange medium, and the non-connected mode can further increase the contact surface of the height end surface with the heat exchange medium. The strip-shaped through groove 8 arranged on the rib plate 7 can communicate each micro-channel 3, thereby improving the heat exchange efficiency. The strip-shaped through groove 8 is located on the side of the width side of the strip-shaped convex body 6, which can compensate for the reduction of the flow cross-sectional area caused by the arrangement of the strip-shaped convex body 6, thereby ensuring the efficient flow of the heat exchange medium.

[0050] As the optimization of the embodiment, the thickness of the strip-shaped convex body 6 is adapted to the thickness of the rib plate 7, and the strip-shaped convex body 6 is provided with a flow guide part 9 at the upstream end and the downstream section, the flow guide part 9 extends along the height direction of the strip-shaped convex body 6, and the cross section is triangular.

[0051] Specifically, the thickness of the strip-shaped convex body 6 is the same as that of the rib plate 7, and the cross-sectional area of the strip-shaped through groove 8 is adapted to the cross-sectional area of the strip-shaped convex body 6, which is beneficial to ensure that the flow capacity of the heat exchange medium at different axial positions is basically the same, and in addition, the flow guide part 9 on the strip-shaped convex body 6 has an inclined surface or an arc surface inclined from both sides to the middle, which can guide the heat exchange medium to the strip-shaped through groove 8, thereby improving the flow efficiency.

[0052] Specific working principle: After the heat exchange medium enters each micro-channel 3, it flows to both sides when passing through the strip-shaped convex body 6, and flows through the strip-shaped through groove 8. In this process, heat exchange media of different temperatures can diffuse and mix, and then branch into the micro-channels 3 between the strip-shaped convex bodies 6, and so on, until they flow out of the pipe body 1. The heat exchange medium exchanges heat with the pipe body 1 when flowing through the pipe body 1, and the pipe body 1 exchanges heat with the outside air.

[0053] Embodiment 3

[0054] The specific working principle of the embodiment is basically the same as that of embodiment 1, and the difference lies in the specific size.

[0055] Specific embodiments such as Figure 6 As shown in the figure, the pipe body 1 is provided with 5 micro-channels 3, the total thickness of the pipe body 1 is 2mm, the total width is 25.4mm, and the upper and lower wall thicknesses of the pipe body 1 are 0.4mm; the width of the inner channel 5 is 4.46mm, the width of the outer channel 4 is 4.43, and the inner chamfer radius of the micro-channel 3 is 0.2mm; the thickness of the rib plate 7 is 0.44mm, and the thickness of the arc-shaped side wall 2 is 0.7mm.

[0056] Embodiment 4

[0057] The specific working principle of the embodiment is basically the same as that of embodiment 1, and the difference lies in the specific size.

[0058] The specific implementation is as follows Figure 7 As shown in the figure, the pipe body 1 is provided with 7 micro-channels 3, the total thickness of the pipe body 1 is 2 mm, the total width is 32 mm, the upper and lower wall thickness of the pipe body 1 is 0.45 mm; the width of the inner channel 5 is 4.06 mm, the width of the outer channel 4 is 0.35, the inner chamfer radius of the micro-channel 3 is 0.2 mm; the thickness of the rib plate 7 is 0.35 mm, and the thickness of the arc-shaped side wall 2 is 1 mm.

[0059] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art to which the present application belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A microchannel flat tube comprising a tube body (1) having at least three axially extending microchannels (3) arranged in the width direction, and arc-shaped side walls (2) provided on the width sides of the tube body (1), characterized in that, The micro-channel (3) comprises two outer channels (4) on both sides and several inner channels (5) between the two outer channels (4), and the width of the inner channel (5) is greater than that of the outer channel (4).

2. The micro-channel flat tube of claim 1 wherein, The micro-channel (3) is provided with an axially extending strip-shaped convex (6) on the bottom surface and / or top surface, and the height of the strip-shaped convex (6) is less than that of the micro-channel (3).

3. The micro-channel flat tube of claim 2 wherein, The adjacent micro-channels (3) are separated by a rib plate (7), and a plurality of strip-shaped through grooves (8) are provided on the rib plate (7).

4. The micro-channel flat tube of claim 3 wherein, The strip-shaped convex (6) and the strip-shaped through groove (8) are arranged in the axial direction, and the strip-shaped through groove (8) and the strip-shaped convex (6) correspond to each other in the axial position.

5. The micro-channel flat tube of claim 4 wherein, The thickness of the strip-shaped convex (6) is adapted to the thickness of the rib plate (7), and the strip-shaped convex (6) is provided with a flow guide portion (9) at least at the upstream end, the flow guide portion (9) extends along the height direction of the strip-shaped convex (6), and the cross section is triangular or arc-shaped.

6. The micro-channel flat tube of claim 2 wherein, The strip-shaped convex (6) of the adjacent micro-channel (3) is arranged on the bottom surface and the top surface, respectively.

7. The micro-channel flat tube according to any of claims 1-6, wherein, The width of the inner channel (5) is between 4.01-4.11mm, and the width of the outer channel (4) is between 3.75-3.85mm; Or, the width of the inner channel (5) is between 4.41-4.51mm, and the width of the outer channel (4) is between 4.38-4.48mm; Or, the width of the inner channel (5) is between 5.37-5.47mm, and the width of the outer channel (4) is between 5.06-5.16mm.

8. The micro-channel flat tube according to any of claims 1-6, wherein, The adjacent micro-channels (3) are separated by a rib plate (7), and the thickness of the rib plate (7) is between 0.3-0.5mm.

9. The micro-channel flat tube according to any of claims 1-6, wherein, The thickness of the arc-shaped side wall (2) is between 0.65-1.05mm, and the radius of the arc-shaped side wall (2) is between 0.5-0.65mm.

10. The micro-channel flat tube according to any of claims 1-6, wherein The micro-channel (3) is provided with an inner chamfer, and the radius of the inner chamfer is between 0.15-0.25mm; The thickness of the pipe body (1) is between 1.95-2.05mm, and the height of the micro-channel (3) is between 1.15-1.25mm.

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