A microchannel heat exchanger

Abstract

The present invention discloses a microchannel heat exchanger including a first header, a second header, a condensation module and an evaporation module. The first header and the second header are both provided with a transverse hole area and a longitudinal hole area along the length direction. The condensation module includes a plurality of first flat tubes and fins arranged between adjacent first flat tubes. The plurality of first flat tubes are installed in parallel between the longitudinal hole area of ​​the first header and the longitudinal hole area of ​​the second header. The two ends of the first flat tubes extend into the longitudinal holes. The evaporation module includes a single or multiple second flat tubes. The single or multiple second flat tubes are installed in parallel between the transverse hole area of ​​the first header and the transverse hole area of ​​the second header. The two ends of the second flat tubes extend into the transverse holes. The microchannel heat exchanger of the present invention increases the heat dissipation effect of the evaporation side on the product, reduces the occupied space and refrigerant filling amount of the heat exchanger, can realize the circulation flow of the refrigerant by relying on the siphon effect, and is suitable for occasions without external power and with relatively high space requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of microchannel heat exchange, and in particular relates to a microchannel heat exchanger suitable for a small space without external power. Background Art

[0002] Traditional air conditioning heat exchangers have always adopted a fin-tube structure, and its technology is relatively mature. However, as the requirements for compactness, high efficiency and low cost of traditional air conditioning continue to increase, fin-tube heat exchangers are becoming increasingly difficult to meet the requirements. At the same time, this traditional fin-tube heat exchanger also generally has disadvantages such as low heat exchange efficiency, large size, and easy leakage of refrigerant. Therefore, a microchannel heat exchanger with better performance has begun to be used in air conditioning equipment. Its compact structure and high heat exchange efficiency have groundbreaking significance for the development of air conditioning equipment.

[0003] In the prior art, microchannel heat exchangers generally include a variety of structural forms. Heat exchange tubes generally use flat tubes with multiple microchannels. Heat exchange fins are arranged between the flat tubes, and the flat tubes are fixed to the manifold by welding. Among them, the manifolds also have various forms, and the cross-section is generally circular. The microchannel heat exchangers currently on the market are mainly for household air-conditioning equipment and refrigeration equipment in the industrial field. The connection between the fins and the microchannel flat tubes of traditional microchannel heat exchangers mostly adopts an expansion tube connection method, which places high demands on the strength of the structure. At the same time, the heat exchanger designed for this type of product occupies a relatively large space and is not suitable for occasions where the heat exchanger has no external power and has relatively high space requirements; and the small space limits the size of the heat exchanger, making the heat exchange efficiency of the microchannel heat exchanger in the existing small space not high. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a microchannel heat exchanger that can meet higher heat dissipation efficiency even in the absence of external power and in situations where space requirements are high.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A microchannel heat exchanger includes a first header, a second header, a condensation module and an evaporation module. The first header and the second header are both provided with a transverse hole area and a longitudinal hole area along the length direction. The transverse hole area includes a single or multiple transverse holes parallel to the length direction, and the longitudinal hole area includes a multiple longitudinal holes perpendicular to the length direction. The condensation module includes a plurality of first flat tubes, fins and side plates arranged between adjacent first flat tubes. The plurality of first flat tubes are installed in parallel between the longitudinal hole area of ​​the first header and the longitudinal hole area of ​​the second header, and both ends of the first flat tubes extend into the longitudinal holes. The evaporation module includes a single or multiple second flat tubes. The single or multiple second flat tubes are installed in parallel between the transverse hole area of ​​the first header and the transverse hole area of ​​the second header, and both ends of the second flat tubes extend into the transverse holes.

[0007] As one of the further preferred solutions, the width of the second flat tube is greater than, equal to or smaller than that of the first flat tube.

[0008] As one of the further preferred solutions, when the second flat tube is single, a large wide flat hollow profile is used.

[0009] As one of the further preferred schemes, the evaporation module is close to the heat source, the condensation module is provided with a cold source, and the refrigerant is circulated in the evaporation module and the condensation module by means of siphon effect.

[0010] As one of the further preferred solutions, the installation angle between the evaporation module and the condensation module is 0-90°.

[0011] As one of the further preferred solutions, both the first flat tube and the second flat tube are made of full aluminum material.

[0012] As one of the further preferred schemes, both ends of the first collecting tube and the second collecting tube are fixed with end covers, the two ends of the first flat tube are respectively brazed with the first collecting tube and the second collecting tube as one, the two ends of the second flat tube are respectively brazed with the first collecting tube and the second collecting tube as one, and the fins are brazed between adjacent first flat tubes.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] A transverse hole area and a longitudinal hole area are provided on both the first collecting pipe and the second collecting pipe, the first flat tube of the condensing module is arranged between the longitudinal hole areas, and the second flat tube of the evaporating module is arranged between the transverse hole areas, so that the contact area between the second flat tube and the heat source is significantly increased, thereby maximizing the heat exchange effect between the evaporating module and the heat source, and the first flat tube group with fins can also fully exchange heat with the cold source to meet the recycling of the refrigerant.

[0015] The evaporation module is placed close to the heat source, and the condensation module is placed close to the cold source. The refrigerant relies on the siphon effect to circulate in the evaporation module and the condensation module. This can not only ensure a high absorption and heat dissipation effect, but also realize fluid circulation without external power. It is especially suitable for occasions without external power and with relatively high space requirements.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] Figure 1 Schematic diagram of the structure of the microchannel heat exchanger of the present invention;

[0019] Figure 2 is a schematic diagram of the structure of the header of the present invention;

[0020] Figure 3 is a schematic diagram of the structure of another side of the header of the present invention;

[0021] Figure 4 It is a schematic diagram of the refrigerant flow principle of the microchannel heat exchanger of the present invention.

[0022] In the figure, 1-first collecting pipe, 2-second collecting pipe, 3-condensing module, 4-evaporating module, 5-first flat tube, 6-fin, 7-side plate, 8-end cover group, 9-second flat tube; P1-longitudinal hole area, P2-transverse hole area, 10-longitudinal hole, 20-transverse hole. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0024] Please refer to Figure 1-3The microchannel heat exchanger described in this embodiment includes a first header 1, a second header 2, a condensation module 3 and an evaporation module 4. The two ends of the condensation module 3 and the evaporation module 4 are respectively connected to the first header 1 and the second header 2. The first header 1 and the second header 2 are both provided with a transverse hole area P2 and a longitudinal hole area P1 along the length direction. The transverse hole area P2 includes a single or multiple transverse holes 20 parallel to the length direction of the header, and the longitudinal hole area P1 includes a plurality of longitudinal holes 10 perpendicular to the length direction of the header. The condensation module 3 includes a plurality of first flat tubes 5, fins 6 arranged between adjacent first flat tubes and side plates 7 on both sides. The plurality of first flat tubes 5 are installed in parallel between the longitudinal hole areas P1 of the two headers 1, and the two ends of the first flat tubes 5 extend into the longitudinal holes 10. The evaporation module 4 includes a single or multiple second flat tubes 9. The single or multiple second flat tubes 9 are installed in parallel between the transverse hole areas P2 of the two headers, and the two ends of the second flat tubes 9 extend into the transverse holes 20.

[0025] The microchannel heat exchanger described in the present invention adopts a manifold with a special structure. A transverse hole area and a longitudinal hole area are arranged on opposite sides of the two manifolds. The condensation module is arranged between the longitudinal hole areas, and the evaporation module is arranged between the transverse hole areas, so that the heat exchange mode of the condensation module and the evaporation module is different. The second flat tube 9 in the evaporation module is arranged horizontally, so that its contact area with the heat source is significantly increased compared with the traditional method, thereby greatly improving the heat dissipation effect of the product. The first flat tubes in the condensation module are arranged in parallel longitudinally to ensure the condensation effect of the refrigerant. Therefore, the microchannel heat exchanger described in the present invention can not only meet the higher heat absorption and heat dissipation effect, but also meet the high-performance recycling of the refrigerant.

[0026] In this embodiment, the width of the second flat tube 9 used in the evaporation module can be greater than, equal to, or less than the width of the first flat tube 5. Preferably, the width of the second flat tube 9 is greater than that of the first flat tube 5, so that the contact area between the evaporation side and the heat source is larger. When the second flat tube 9 is single, a large wide flat hollow profile is used to achieve a higher heat absorption effect. At the same time, the number and size of the transverse holes and the longitudinal holes can be adjusted according to different working conditions to meet the heat dissipation requirements of spaces of different sizes.

[0027] When in use, the evaporation module 4 is placed close to the heat source, and the condensation module 3 is provided with a cold source, and the refrigerant is circulated in the evaporation module 4 and the condensation module 3 by means of siphon effect. Figure 4As shown, when the microchannel heat exchanger of the present invention is filled with a refrigerant, when in use, the evaporation module 4 is placed close to the heat source of the product to be dissipated. The refrigerant absorbs the heat source of the product at the evaporation module 4, evaporates from liquid to gas, and takes away the heat while the refrigerant rises. The refrigerant reaches the condensation module 3 through the first header 1. The condensation module 3 forces air convection through the fan, and the heat of the refrigerant is taken away at the condensation module 3, condensing from gas to liquid. The liquid refrigerant flows downward under the action of gravity. The refrigerant reaches the evaporation module 4 through the second header 2 and continues to evaporate, thereby forming a siphon-type heat dissipation system that does not require internal drive. Therefore, the microchannel heat exchanger of the present invention can be used in a small space without external power or internal drive to achieve a higher heat exchange effect.

[0028] Under the condition of ensuring the siphon effect to realize the circulation of refrigerant, the evaporation module and the condensation module can be arranged side by side left and right or side by side up and down, or side by side with relative inclination. The installation angle of the two can be adjusted between 0-90°, so as to meet the installation size requirements of microchannel heat exchangers in different spaces.

[0029] In order to achieve the lightness of the heat exchanger, the first flat tube and the second flat tube used in the present invention are all made of aluminum, which is environmentally friendly and has a long service life. The microchannel heat exchanger used in the present invention is provided with end covers at both ends of the first header and the second header to realize a closed refrigerant circuit, and the two ends of the first flat tube are brazed with the first header and the second header respectively, and the two ends of the second flat tube are brazed with the first header and the second header respectively, and the fins are brazed between adjacent first flat tubes to ensure the best heat exchange effect.

[0030] The microchannel heat exchanger described in the present invention increases the heat dissipation effect of the evaporation side on the product, reduces the occupied space and refrigerant filling amount of the heat exchanger, can rely on the siphon effect to achieve the circulation flow of the refrigerant, and provides a heat exchanger structure with better performance for occasions without external power and with relatively high space requirements, and has great potential for market promotion.

[0031] The above description is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A microchannel heat exchanger, comprising a first header, a second header, a condensation module and an evaporation module, characterized in that: The first header and the second header are both provided with a transverse hole area and a longitudinal hole area along the length direction, the transverse hole area includes a single or multiple transverse holes parallel to the length direction, and the longitudinal hole area includes multiple longitudinal holes perpendicular to the length direction. The condensing module comprises a plurality of first flat tubes, fins and side plates arranged between adjacent first flat tubes, the plurality of first flat tubes are installed in parallel between the longitudinal hole area of ​​the first header and the longitudinal hole area of ​​the second header, and the two ends of the first flat tubes extend into the longitudinal holes. The evaporation module comprises a single or multiple second flat tubes, wherein the single second flat tube is installed between the transverse hole area of ​​the first header and the transverse hole area of ​​the second header, or multiple second flat tubes are installed in parallel between the transverse hole area of ​​the first header and the transverse hole area of ​​the second header, and both ends of the second flat tube extend into the transverse holes; The evaporation module is close to the heat source, the condensation module is provided with a cold source, and the refrigerant is circulated in the evaporation module and the condensation module by siphoning; The second flat tube is wider than the first flat tube; and both the first flat tube and the second flat tube are made of full aluminum.

2. The microchannel heat exchanger according to claim 1, characterized in that: When the second flat tube is single, a large wide flat hollow profile is used.

3. The microchannel heat exchanger according to claim 1, characterized in that: The installation angle between the evaporation module and the condensation module is 0-90°.

4. The microchannel heat exchanger according to claim 1, characterized in that: Both ends of the first and second current collecting tubes are fixed with end covers, both ends of the first flat tubes are brazed to the first and second current collecting tubes as a whole, both ends of the second flat tubes are brazed to the first and second current collecting tubes as a whole, and the fins are brazed between adjacent first flat tubes.

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