Heat exchanger, air conditioner

Abstract

The present invention provides a heat exchanger and an air conditioner, wherein the heat exchanger includes a heat exchange core, the heat exchange core has a plurality of first heat exchange tubes arranged in parallel, the first port of each first heat exchange tube is connected to a first flow diversion structure, the first flow diversion structure includes a first header and a second header arranged at intervals from each other, at least two first connecting tubes are arranged at intervals between the first header and the second header to connect the first header and the second header to form a refrigerant circuit, at least two first connecting tubes are arranged at intervals along the length direction of the first header, and part of the refrigerant introduced into the first flow diversion structure enters the first heat exchange tube through the first connecting tube. According to the present invention, the first flow diversion structure has a ladder-shaped connecting structure, and the refrigerant forms a circulating flow mixing in this connecting cavity, thereby achieving full mixing and uniform diversion of the inflowing gas-liquid two-phase refrigerant, and the refrigerant can enter the heat exchange tube in a uniform mist form, thereby improving the heat exchange performance of the heat exchanger.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular relates to a heat exchanger and an air conditioner. Background Art

[0002] In traditional microchannel heat exchangers, the flow diversion structure uses a header on each side for diversion. The refrigerant is roughly diverted through the header and enters the heat exchange tube for diversion. The header of the traditional microchannel heat exchanger has no diversion measures. After entering the header, the gas-liquid two-phase stratification phenomenon is obvious, resulting in uneven distribution of the refrigerant entering the flat tube and poor heat exchange performance of the heat exchanger. The current microchannel heat exchanger system uses a header diversion method. During the diversion process, the refrigerant is prone to vapor-liquid stratification and deposition, resulting in uneven diversion of the refrigerant, affecting the heat exchange effect of the heat exchanger. Summary of the invention

[0003] Therefore, the present invention provides a heat exchanger and an air conditioner that can overcome the shortcomings of the related art that the heat exchanger is prone to gas-liquid stratification and deposition when the gas-liquid two-phase refrigerant is diverted and flows in, resulting in uneven diversion of the refrigerant and reduced heat exchange effect of the heat exchanger.

[0004] In order to solve the above problems, the present invention provides a heat exchanger, including a heat exchange core, the heat exchange core having a plurality of first heat exchange tubes arranged in parallel, the first port of each of the first heat exchange tubes being connected to a first diversion structure in parallel, the first diversion structure comprising a first collecting tube and a second collecting tube arranged at intervals from each other, at least two first connecting tubes are provided at intervals between the first collecting tube and the second collecting tube to connect the first collecting tube and the second collecting tube to form a refrigerant circuit, at least two first connecting tubes are arranged at intervals along the length direction of the first collecting tube, and part of the refrigerant introduced into the first diversion structure enters the first heat exchange tube through the first connecting tube.

[0005] In some embodiments, the first collecting pipe is connected to the first connecting pipe through a first flow hole, and the diameter of the first flow hole is φa, 3mm≤φa≤12mm; and / or the second collecting pipe is connected to the first connecting pipe through a second flow hole, and the diameter of the second flow hole is φb, 3mm≤φb≤12mm.

[0006] In some embodiments, both ends of the first connecting tube are in a tapered cone shape; or, both ends of the first connecting tube have arc-shaped grooves matching the outer circumferential wall of the corresponding first header or second header.

[0007] In some embodiments, the first connecting pipe, the first collecting pipe, and the second collecting pipe are integrally welded together in a welding furnace.

[0008] In some embodiments, the heat exchange core also has a plurality of second heat exchange tubes arranged in parallel, the first port of each of the second heat exchange tubes is connected to a second diversion structure in parallel, and the second port of each of the second heat exchange tubes is connected to a third diversion structure in parallel, wherein the third diversion structure can divert the refrigerant into the second heat exchange tube, and the second diversion structure can divert the refrigerant from the second heat exchange tube into the first collecting pipe.

[0009] In some embodiments, the second diversion structure includes a third collecting pipe and at least two second connecting pipes, at least two second connecting pipes are connected between the third collecting pipe and the first collecting pipe to connect the first collecting pipe and the third collecting pipe to form a refrigerant circuit, and the second connecting pipe is connected to the first port of the second heat exchange tube.

[0010] In some embodiments, the third diversion structure includes a fourth collecting pipe and a fifth collecting pipe spaced apart from each other, at least two third connecting pipes are provided at the interval between the fourth collecting pipe and the fifth collecting pipe to connect the fourth collecting pipe and the fifth collecting pipe to form a refrigerant circuit, and a refrigerant inlet and outlet pipe is connected to one of the fourth collecting pipe and the fifth collecting pipe.

[0011] In some embodiments, the heat exchanger is a microchannel heat exchanger.

[0012] The present invention also provides an air conditioner, comprising the above-mentioned heat exchanger.

[0013] The present invention provides a heat exchanger and an air conditioner. Before the gas-liquid two-phase refrigerant enters the first heat exchange tube for heat exchange, it is firstly diverted in the first diversion structure. Due to the ladder-shaped connecting structure of the first diversion structure, the refrigerant forms a circulating flow and mixing in this connecting cavity, thereby achieving sufficient mixing and uniform diversion of the inflowing gas-liquid two-phase refrigerant. The refrigerant can enter the heat exchange tube in a uniform mist form, thereby improving the heat exchange performance of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of a heat exchanger according to an embodiment of the present invention;

[0015] Figure 2 for Figure 1 A local enlarged schematic diagram of the middle A;

[0016] Figure 3 for Figure 1 Schematic diagram of the structure after each shunt structure is disassembled;

[0017] Figure 4 A schematic diagram of the refrigerant flow direction under one structure of each flow diversion structure of the present invention;

[0018] Figure 5 A schematic diagram of the refrigerant flow direction under another structure of each flow diversion structure of the present invention;

[0019] Figure 6 The figure is a schematic diagram of the refrigerant flow direction under another structure of each diversion structure of the present invention.

[0020] The reference numerals are:

[0021] 1. Heat exchange core; 11. First heat exchange tube; 12. Second heat exchange tube; 21. First header; 211. First flow hole; 22. Second header; 221. Second flow hole; 23. First connecting tube; 24. Third header; 25. Second connecting tube; 26. Fourth header; 27. Fifth header; 28. Third connecting tube; 29. ​​Refrigerant inlet and outlet pipes; 31. First shunt structure; 32. Second shunt structure; 33. Third shunt structure. DETAILED DESCRIPTION

[0022] See also Figures 1 to 6 As shown, according to an embodiment of the present invention, a heat exchanger is provided, comprising a heat exchange core 1, wherein the heat exchange core 1 has a plurality of first heat exchange tubes 11 arranged in parallel, wherein the first ports of each of the first heat exchange tubes 11 are connected in parallel with a first flow distribution structure 31, wherein the first flow distribution structure 31 comprises a first header 21 and a second header 22 arranged at intervals (preferably in parallel), wherein at least two first connecting tubes 23 are arranged at intervals between the first header 21 and the second header 22 to connect the first header 21 and the second header 22 to form a cold flow. The refrigerant circuit comprises at least two first connecting pipes 23 arranged at intervals along the length direction of the first collecting pipe 21, so that the first diversion structure 31 forms a ladder-like connecting structure, and part of the refrigerant introduced into the first diversion structure 31 enters the first heat exchange tube 11 through the first connecting pipe 23. It can be understood that the second port of the first heat exchange tube 11 is connected in parallel with a sixth collecting pipe (not shown in the figure), and when the heat exchanger is used as an outdoor heat exchanger, the sixth collecting pipe is a refrigerant inlet pipe when the air conditioner operates in cooling mode, and is a refrigerant outlet pipe when the air conditioner operates in heating mode. In this technical solution, the gas-liquid two-phase refrigerant (generally the refrigerant flowing out of the indoor heat exchanger) is firstly diverted in the first diversion structure 31 before entering the first heat exchange tube 11 for heat exchange. Due to the ladder-shaped connecting structure of the first diversion structure 31, the refrigerant forms a circulating flow and mixing in this connecting cavity, thereby achieving sufficient mixing and uniform diversion of the inflowing gas-liquid two-phase refrigerant. The refrigerant can enter the heat exchange tube in a uniform mist form, thereby improving the heat exchange performance of the heat exchanger.

[0023] In some embodiments, the first collecting pipe 21 is connected to the first connecting pipe 23 through a first flow hole 211, and the diameter of the first flow hole 211 is φa, 3mm≤φa≤12mm; and / or, the second collecting pipe 22 is connected to the first connecting pipe 23 through a second flow hole 221, and the diameter of the second flow hole 221 is φb, 3mm≤φb≤12mm. If the flow hole is too small, it will throttle the refrigerant and affect the heat exchange effect. If it is too large, it will increase the volume of the diversion structure and make processing inconvenient. If it is within the aforementioned range, both can be taken into account.

[0024] In some embodiments, Figure 5 As shown, the two ends of the first connecting tube 23 are in a conical shape with a narrowed mouth. At this time, when the first connecting tube 23 is assembled with the first header 21 and the second header 22, the two ends of the first connecting tube 23 can be respectively inserted into the first flow hole 211 and the second flow hole 221, thereby forming an assembly positioning to facilitate assembly; or Figure 4 As shown, in other embodiments, both ends of the first connecting pipe 23 have arc-shaped grooves matching the outer circumferential wall of the corresponding first header 21 or second header 22, and the arc-shaped grooves can form assembly positioning for the first header 21 and the second header 22, facilitating assembly. Figure 6 As shown, in other embodiments, both ends of the first connecting tube 23 are respectively constructed with through holes perpendicular to its flow direction, and the first collecting pipe 21 and the second collecting pipe 22 are respectively inserted into the through holes. In this way, the matching requirements for the tube diameters of the first collecting pipe 21 and the second collecting pipe 22 and the apertures of the through holes are relatively high, and there may be assembly difficulties when the matching degree is not high.

[0025] In a specific implementation, the first connecting pipe 23, the first collecting pipe 21, and the second collecting pipe 22 are integrally welded together in a welding furnace.

[0026] In some embodiments, the heat exchange core 1 also has a plurality of second heat exchange tubes 12 arranged in parallel, and the first port of each of the second heat exchange tubes 12 is connected in parallel with a second diversion structure 32, and the second port of each of the second heat exchange tubes 12 is connected in parallel with a third diversion structure 33, wherein the third diversion structure 33 can divert the refrigerant into the second heat exchange tube 12, and the second diversion structure 32 can divert the refrigerant from the second heat exchange tube 12 into the first collecting pipe 21. In this technical solution, when the heat exchanger is used as an outdoor heat exchanger, when the air conditioner operates in cooling mode, the second heat exchange tube 12 can increase the supercooling of the refrigerant and thereby improve the energy efficiency of the air conditioner, and when the air conditioner operates in heating mode, the second diversion structure 32 can fully and evenly divert the refrigerant entering the first diversion structure 31 and the first heat exchange tube 11. Similar to the structure of the first diversion structure 31, the second diversion structure 32 includes a third collecting pipe 24 and at least two second connecting pipes 25, at least two of the second connecting pipes 25 are connected between the third collecting pipe 24 and the first collecting pipe 21 to connect the first collecting pipe 21 and the third collecting pipe 24 to form a refrigerant circuit, and the second connecting pipe 25 is connected to the first port of the second heat exchange tube 12. Furthermore, the third diversion structure 33 includes a fourth collecting pipe 26 and a fifth collecting pipe 27 which are arranged at intervals (preferably parallel intervals) from each other, and at least two third connecting pipes 28 are provided at the intervals between the fourth collecting pipe 26 and the fifth collecting pipe 27 to connect the fourth collecting pipe 26 and the fifth collecting pipe 27 to form a refrigerant circuit, and a refrigerant inlet and outlet pipe 29 is connected to one of the fourth collecting pipe 26 and the fifth collecting pipe 27. In this way, when the heat exchanger is used as an outdoor heat exchanger, when the air conditioner operates in cooling mode, the second heat exchange tube 12 can increase the supercooling of the refrigerant and thereby improve the energy efficiency of the air conditioner, and when the air conditioner operates in heating mode, the second diversion structure 32 can fully and evenly divert the refrigerant entering the second heat exchange tube 12.

[0027] In some embodiments, the heat exchanger is a microchannel heat exchanger, and in this case, the first heat exchange tube 11 and the second heat exchange tube 12 are both U-shaped flat tubes.

[0028] The specific embodiments of the present invention are described below in conjunction with the accompanying drawings:

[0029] First embodiment:

[0030] Combination Figure 6The first header 21 and the second header 22 in the figure have a diameter range of φ4 to φ14 (unit: mm, the same below), and are formed with N small holes (i.e., the aforementioned first flow holes 211 and the second flow holes 221, the same below), with a diameter range of φ3 to φ12. The connecting tube (i.e., the first connecting tube 23, the same below) has a diameter range of φ6 to φ16, a length range of 15mm to 35mm, and has flat holes to match the flat tubes, and through holes are opened at both ends. The N connecting tubes and the first header 21 and the second header 22 form a ladder-shaped mixed interconnection structure through-fitting, and the spacing of the connecting tube combination is 4mm to 50mm, which can be freely configured. The length of the first header 21 and the second header 22 matches the height of the heat exchanger, and the specific length can be freely matched.

[0031] Working principle: The refrigerant finally enters the first header 21 from the refrigerant inlet and outlet pipe 29 (via the third flow diversion structure 33, the second heat exchange tube 12, and the second flow diversion structure 32 in sequence), and is first ejected to the far end under pressure, enters the connecting tube through the small hole of the first header 21, and then enters the flat tube through the flat hole. At the same time, part of the refrigerant flows downward after passing through the second header 22, and then flows into the flat tube through the connecting tube, forming a circulation flow of the first header 21-connecting tube-second header 22-connecting tube-first header 21. The refrigerant deposited in the liquid phase can achieve full mixing of the gas and liquid phases in the circulation flow, and even diversion, thereby improving the heat exchange performance.

[0032] This scheme adopts the structure of tube-to-tube stringing together, which is relatively difficult to assemble. After this structure is assembled with the heat exchanger, it is integrally welded by a welding furnace to form a heat exchanger component.

[0033] Second embodiment:

[0034] Combination Figure 5 , the main difference between the structure and the first embodiment lies in the shape of the connecting pipe. Specifically, the connecting pipe of the ladder-shaped connecting and diverting structure of this combination has a pipe diameter range of φ5 to φ15 and a length range of 15mm to 35mm. Both ends are spun into a cone and flat holes are opened to match the flat pipes. The N connecting pipes and the first header 21 and the second header 22 form an inserted combination into a ladder-shaped mixed connecting structure. The spacing of the connecting pipe combination is 4mm to 50mm and can be freely configured. The first header 21 and the second header 22 have a pipe diameter range of φ6 to φ16 and are formed with N small holes with a hole diameter range of φ5 to φ12. The length of the first header 21 and the second header 22 matches the height of the heat exchanger, and the length can be freely matched. The two ends of the header are closed with end covers.

[0035] This combined assembly adopts the method of inserting the conical mouth of the connecting pipe into the round holes of the first header 21 and the second header 22. The assembly is relatively simple, but the processing procedures of each part are relatively difficult. After the structure is assembled with the heat exchanger, it is integrally welded in a welding furnace to form a heat exchanger component.

[0036] Third embodiment:

[0037] Combination Figure 4 , the main difference between the structure and the first embodiment lies in the shape of the connecting pipe. Specifically, the connecting pipe of the ladder-shaped connecting and diverting structure has a diameter range of φ5 to φ15 and a length range of 15mm to 35mm. After punching semicircular holes at both ends, N connecting pipes and the first header 21 and the second header 22 are assembled into a ladder-shaped connecting and diverting structure. The spacing of the connecting pipe combination is 4mm to 50mm and can be freely configured. The first header 21 and the second header 22 have a diameter range of φ5 to φ15 and are formed with N small holes with a diameter range of φ3 to φ12. The length of the first header 21 and the second header 22 matches the height of the heat exchanger, and the length can be freely matched. The two ends of the header are closed with end caps.

[0038] This combined assembly adopts direct assembly of the first header 21, the second header 22 and the semicircular holes at both ends of the connecting pipe, and the assembly method is simple. After this structure is assembled with the heat exchanger, it is integrally welded by a welding furnace to form a heat exchanger component.

[0039] According to an embodiment of the present invention, there is also provided an air conditioner, comprising the above-mentioned heat exchanger.

[0040] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A heat exchanger, It is characterized in that The invention comprises a heat exchange core (1), wherein the heat exchange core (1) has a plurality of first heat exchange tubes (11) arranged in parallel, wherein the first port of each of the first heat exchange tubes (11) is connected in parallel to a first flow distribution structure (31), wherein the first flow distribution structure (31) comprises a first header (21) and a second header (22) arranged at intervals from each other, wherein at least two first connecting tubes (23) are arranged at intervals between the first header (21) and the second header (22) to connect the first header (21) and the second header (22) to form a refrigerant circuit, and wherein the at least two first connecting tubes (23) are arranged at intervals between the first header (21) and the second header (22) to form a refrigerant circuit. A connecting pipe (23) is arranged at intervals along the length direction of the first collecting pipe (21), and part of the refrigerant introduced into the first flow distribution structure (31) enters the first heat exchange tube (11) through the first connecting pipe (23); the heat exchange core (1) also has a plurality of second heat exchange tubes (12) arranged in parallel, the second heat exchange tubes (12) are located below the first heat exchange tube (11), the first ports of each of the second heat exchange tubes (12) are connected in parallel with the second flow distribution structure (32), and the second ports of each of the second heat exchange tubes (12) are connected in parallel with the second flow distribution structure (32). A third flow-dividing structure (33) is connected, wherein the third flow-dividing structure (33) is capable of diverting the refrigerant into the second heat exchange tube (12), and the second flow-dividing structure (32) is capable of diverting the refrigerant from the second heat exchange tube (12) into the first header (21); the second flow-dividing structure (32) includes a third header (24) and at least two second connecting tubes (25), and the at least two second connecting tubes (25) are connected between the third header (24) and the first header (21) to connect the first header (21) and the third header (24) to form a refrigerant circuit, the second connecting pipe (25) is connected to the first port of the second heat exchange tube (12); the third diversion structure (33) includes a fourth collecting pipe (26) and a fifth collecting pipe (27) which are arranged at intervals from each other, at least two third connecting pipes (28) are provided at the intervals between the fourth collecting pipe (26) and the fifth collecting pipe (27) to connect the fourth collecting pipe (26) and the fifth collecting pipe (27) to form a refrigerant circuit, and a refrigerant inlet and outlet pipe (29) is connected to one of the fourth collecting pipe (26) and the fifth collecting pipe (27).

2. The heat exchanger according to claim 1, It is characterized in that The first collecting pipe (21) is connected to the first connecting pipe (23) via a first flow hole (211), and the diameter of the first flow hole (211) is φa, 3mm≤φa≤12mm; and / or the second collecting pipe (22) is connected to the first connecting pipe (23) via a second flow hole (221), and the diameter of the second flow hole (221) is φb, 3mm≤φb≤12mm.

3. The heat exchanger according to claim 1, It is characterized in that The two ends of the first connecting tube (23) are in the shape of a tapered cone; or the two ends of the first connecting tube (23) have arc-shaped grooves matching the outer circumferential wall of the corresponding first header (21) or second header (22).

4. The heat exchanger according to claim 1, It is characterized in that The first connecting pipe (23), the first collecting pipe (21), and the second collecting pipe (22) are integrally welded together in a welding furnace.

5. The heat exchanger according to claim 1, It is characterized in that The heat exchanger is a microchannel heat exchanger.

6. An air conditioner comprising a heat exchanger, It is characterized in that The heat exchanger comprises the heat exchanger according to any one of claims 1 to 5.

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