Heat exchanger and air conditioning system having the same

Abstract

The present invention discloses a heat exchanger and an air conditioning system having the same. The heat exchanger includes: a first heat exchanger core, comprising: a first sub-heat exchanger core and a second sub-heat exchanger core, each of the first and second sub-heat exchanger cores including heat exchange tubes, the heat exchange tubes of the first and second sub-heat exchanger cores being interconnected, and the orthographic projections of the first and second sub-heat exchanger cores on a plane on which the second sub-heat exchanger core lies at least partially overlapping; and a second heat exchanger core, comprising heat exchange tubes, the heat exchange tubes of the second heat exchanger core being connected to the heat exchange tubes of the second sub-heat exchanger core of the first heat exchanger core. At the same inlet air velocity, the ratio of the wind resistance of the heat exchanger to air passing through the first heat exchanger core to the wind resistance of the heat exchanger to air passing through the second heat exchanger core is less than a predetermined value. Using the heat exchanger according to the present invention can improve the performance of the heat exchanger.

Description

Technical Field

[0001] Embodiments of the present invention relate to a heat exchanger and an air conditioning system having the heat exchanger. Background Art

[0002] The heat exchanger includes a header and heat exchange tubes and may include multiple rows of heat exchanger cores. Summary of the Invention

[0003] An object of embodiments of the present invention is to provide a heat exchanger and an air conditioning system having the same, whereby, for example, the performance of the heat exchanger can be improved.

[0004] 19. The heat exchanger of claim 18, wherein the heat exchanger comprises a first heat exchanger core, the first heat exchanger core comprising a first sub-heat exchanger core and a second sub-heat exchanger core, each of the first sub-heat exchanger core and the second sub-heat exchanger core comprising a heat exchange tube, the heat exchange tubes of the first sub-heat exchanger core and the second sub-heat exchanger core being connected to each other, and the orthographic projections of the first sub-heat exchanger core and the second sub-heat exchanger core on the plane where the second sub-heat exchanger core is located at least partially overlap; and a second heat exchanger core, the second heat exchanger core comprising a heat exchange tube, the heat exchange tubes of the second heat exchanger core being connected to the heat exchange tubes of the second sub-heat exchanger core of the first heat exchanger core, wherein at the same inlet wind speed, the ratio of the wind resistance of the heat exchanger to the air passing through the first heat exchanger core to the wind resistance of the heat exchanger to the air passing through the second heat exchanger core is less than a predetermined value.

[0005] According to an embodiment of the present invention, each of the first sub-heat exchanger core and the second sub-heat exchanger core of the first heat exchanger core further includes fins; the second heat exchanger core further includes fins; and under the same inlet wind speed, the wind resistance or pressure drop caused by at least a portion of at least one fin of the second heat exchanger core is greater than the wind resistance or pressure drop caused by at least a portion of at least one fin of the first heat exchanger core.

[0006] According to an embodiment of the present invention, a cross-sectional area of at least one heat exchange tube of the second heat exchanger core is greater than a cross-sectional area of at least one heat exchange tube of the first heat exchanger core.

[0007] According to an embodiment of the present invention, the heat exchanger further includes: a first wind baffle plate, which is located on one side of the second heat exchanger core in the thickness direction of the second heat exchanger core, and the first wind baffle plate and the orthographic projection of the second heat exchanger core on the plane where the second heat exchanger core is located at least partially overlap.

[0008] According to an embodiment of the present invention, the heat exchanger further includes: a connecting portion, through which the heat exchange tubes of the first sub-heat exchanger core and the second sub-heat exchanger core of the first heat exchanger core are connected, and the first wind baffle is located on the side of the first sub-heat exchanger core of the first heat exchanger core away from the connecting portion in the length direction of the heat exchange tubes of the first sub-heat exchanger core of the first heat exchanger core.

[0009] According to an embodiment of the present invention, the first wind resistance plate and the first sub-heat exchanger core of the first heat exchanger core are located on the same side of the second sub-heat exchanger core of the first heat exchanger core in the thickness direction of the second sub-heat exchanger core of the first heat exchanger core.

[0010] According to an embodiment of the present invention, the heat exchanger further comprises: a second wind baffle, which at least partially overlaps with the orthographic projection of the first heat exchanger core on the plane where the second sub-heat exchanger core of the first heat exchanger core is located.

[0011] According to an embodiment of the present invention, the first wind baffle plate and the second wind baffle plate are located on the side of the second sub-heat exchanger core of the first heat exchanger core opposite to the first sub-heat exchanger core in the thickness direction of the second sub-heat exchanger core of the first heat exchanger core, and the wind resistance of the second wind baffle plate is less than or equal to the wind resistance of the first wind baffle plate under the same inlet wind speed.

[0012] According to an embodiment of the present invention, the heat exchanger further comprises: a third wind baffle, which is located between the first sub-heat exchanger core and the second sub-heat exchanger core of the first heat exchanger core in the thickness direction of the second sub-heat exchanger core of the first heat exchanger core.

[0013] According to an embodiment of the present invention, the heat exchanger further includes: a connecting portion, through which the heat exchange tubes of the first sub-heat exchange core and the second sub-heat exchange core of the first heat exchanger core are connected; a first collecting pipe, which is connected to the heat exchange tubes of the second heat exchanger core on a side of the second sub-heat exchanger core of the second heat exchanger core away from the first heat exchanger core; and a second collecting pipe, which is connected to the heat exchange tubes of the first sub-heat exchanger core of the first heat exchanger core on a side of the first sub-heat exchanger core of the first heat exchanger core away from the connecting portion.

[0014] According to an embodiment of the present invention, a cross-sectional area of the first header is greater than a cross-sectional area of the second header.

[0015] According to an embodiment of the present invention, the connection portion includes a plurality of connection pipes, and the heat exchange pipes of the first sub-heat exchange core of the first heat exchange core are respectively connected with the heat exchange pipes of the second sub-heat exchange core of the first heat exchange core through the plurality of connection pipes.

[0016] According to an embodiment of the present invention, at least one of the density of at least part of the fins of at least one fin of the second heat exchange core, the width of the fins, the angle of the fin windows, the number of windows and the length of the windows is greater than at least one of the density of at least part of the fins of at least one fin of the first heat exchange core, the width of the fins, the angle of the fin windows, the number of windows and the length of the windows.

[0017] An embodiment of the present invention further provides an air-conditioning system, comprising: the above-mentioned heat exchanger.

[0018] According to an embodiment of the present invention, the heat exchanger further includes: a connecting portion, through which the heat exchange tubes of the first sub-heat exchange core and the second sub-heat exchange core of the first heat exchanger core are connected; a first collecting pipe, which is connected to the heat exchange tubes of the second heat exchanger core on a side of the second sub-heat exchanger core of the second heat exchanger core away from the first heat exchanger core; and a second collecting pipe, which is connected to the heat exchange tubes of the first sub-heat exchanger core of the first heat exchanger core on a side of the first sub-heat exchanger core of the first heat exchanger core away from the connecting portion.

[0019] According to an embodiment of the present invention, the first header and the second header are arranged horizontally during use.

[0020] According to an embodiment of the present invention, the heat exchanger further includes: a first header, which is connected to the heat exchange tubes of the second heat exchanger core on a side of the second sub-heat exchanger core of the second heat exchanger core away from the first heat exchanger core, wherein the first header is horizontally arranged during use, and the first header is below the second heat exchanger core during use.

[0021] According to an embodiment of the present invention, in use, the first header is below the second heat exchanger core, and the second header is below the second sub-heat exchanger core of the first heat exchanger core.

[0022] According to an embodiment of the present invention, in use, the first header is above the second heat exchanger core, and the second header is above the second sub-heat exchanger core of the first heat exchanger core.

[0023] According to an embodiment of the present invention, in the direction of air flowing through the heat exchanger, the second heat exchanger core and the second sub-heat exchanger core of the first heat exchanger core are located upstream of the first sub-heat exchanger core of the first heat exchanger core.

[0024] According to an embodiment of the present invention, in the direction of air flowing through the heat exchanger, the second heat exchanger core and the second sub-heat exchanger core of the first heat exchanger core are located downstream of the first sub-heat exchanger core of the first heat exchanger core.

[0025] By using the heat exchanger according to the embodiment of the present invention and the air conditioning system having the heat exchanger, for example, the performance of the heat exchanger can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic perspective view of a heat exchanger according to one embodiment of the present invention;

[0027] Figure 2 is a schematic perspective view of a heat exchanger according to another embodiment of the present invention;

[0028] Figure 3 is a schematic perspective view of a fin of a heat exchanger according to an embodiment of the present invention; and

[0029] Figure 4 for Figure 3 A cross-sectional view of the fin is shown. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] An air conditioning system according to an embodiment of the present invention includes a compressor as a heat exchanger of an evaporator and a condenser.

[0032] See also Figures 1 to 2, a heat exchanger 100 according to an embodiment of the present invention includes: a first heat exchanger core 1, the first heat exchanger core 1 includes: a first sub-heat exchanger core 11 and a second sub-heat exchanger core 12, each of the first sub-heat exchanger core 11 and the second sub-heat exchanger core 12 includes a heat exchange tube 8, the heat exchange tubes 8 of the first sub-heat exchanger core 11 and the second sub-heat exchanger core 12 are connected to each other, and the orthographic projections of the first sub-heat exchanger core 11 and the second sub-heat exchanger core 12 on the plane where the second sub-heat exchanger core 12 is located at least partially overlap; and a second heat exchanger core 2, the second heat exchanger core 2 includes: a heat exchange tube 8, and the heat exchange tube 8 of the second heat exchanger core 2 is connected to the heat exchange tube 8 of the second sub-heat exchanger core 12 of the first heat exchanger core 1. At the same inlet air velocity, the ratio of the wind resistance of the heat exchanger 100 to air A passing through the first heat exchanger core 1 to the wind resistance of the heat exchanger 100 to air A passing through the second heat exchanger core 2 is less than a predetermined value. For example, when the heat exchange tubes and fin structures of the first and second heat exchanger cores are identical and no wind resistance plate is installed, at the same inlet air velocity, the ratio of the wind resistance of the heat exchanger pair passing through the first heat exchanger core to the wind resistance of the heat exchanger pair passing through the second heat exchanger core is approximately 2. Without a wind resistance plate, the wind resistance of the heat exchanger 100 to air A passing through the first heat exchanger core 1 is solely the wind resistance of the first heat exchanger core 1. With a wind resistance plate, the wind resistance of the heat exchanger 100 to air A passing through the first heat exchanger core 1 is the combined wind resistance of the first heat exchanger core 1 and the wind resistance plate. Similarly, the wind resistance of the heat exchanger 100 to air A passing through the second heat exchanger core 2, when there is no wind resistance plate, is solely the wind resistance of the second heat exchanger core 2 to air A. When there is a wind resistance plate, the wind resistance of the second heat exchanger core 2 and the wind resistance plate to air A is combined. It should be noted that "at the same inlet air speed" does not mean that the inlet air speeds of the first and second heat exchanger cores must be the same when the heat exchanger is in use. Rather, it means that the ratio of the wind resistance of the heat exchanger pair passing through the first heat exchanger core to the wind resistance of the heat exchanger pair passing through the second heat exchanger core must be measured and compared at the same inlet air speed. The term "at the same inlet air speed" mentioned below should be interpreted similarly.

[0033] In the embodiments of the present invention, see Figures 1 to 4 , each of the first sub-heat exchanger core 11 and the second sub-heat exchanger core 12 of the first heat exchanger core 1 further includes a fin 9; the second heat exchanger core 2 further includes a fin 9; and at the same inlet wind speed, the wind resistance or pressure drop caused by at least a portion of at least one fin 9 of the second heat exchanger core 2 is greater than the wind resistance or pressure drop caused by at least a portion of at least one fin 9 of the first heat exchanger core 1. For example, the density of at least a portion of at least one fin 9 of the second heat exchanger core 2 is greater than the density of the fin 9 of the first heat exchanger core 1. Figure 3 and Figure 4For the wavy fins shown in , the density of the fins can be the number of peaks or troughs per unit length of the wave. If the fins are plate-shaped fins through which the heat exchange tubes pass, the fin density refers to the number of fins per unit length perpendicular to the plane where the fins extend. In addition, the wind resistance or pressure drop can be adjusted by changing at least one of the width W of the fins (along the direction A of the wind), the angle α of the fin openings 91 (the angle α with the direction A of the wind), the number of windows 91, and the length H of the windows 91. For example, at least one of the density of at least part of the fins of at least one fin 9 of the second heat exchange core 2, the width W of the fins, the angle α of the fin openings 91, the number of windows 91, and the length H of the windows 91 is greater than at least one of the density of at least part of the fins of at least one fin 9 of the first heat exchange core 1, the width W of the fins, the angle α of the fin openings 91, the number of windows 91, and the length H of the windows 91. It should be noted that Figure 1 and Figure 2 Only some of the fins are shown as examples, and the number and distribution of the fins are not limited thereto.

[0034] In the embodiments of the present invention, see Figure 1 and Figure 2 , the cross-sectional area of at least one heat exchange tube 8 of the second heat exchanger core 2 is greater than the cross-sectional area of at least one heat exchange tube 8 of the first heat exchanger core 1 .

[0035] In some embodiments of the present invention, the fins of the second heat exchanger core 2 can be identical to the fins of the second sub-heat exchange core 12 of the first heat exchanger core 1. At the same inlet air velocity, the wind resistance or pressure drop caused by at least a portion of at least one fin 9 of the second heat exchanger core 2 is greater than the wind resistance or pressure drop caused by at least a portion of at least one fin 9 of the first heat exchanger sub-core 11 of the first heat exchanger core 1. In some examples of the present invention, the flat tubes of the second heat exchanger core 2 can be identical to the flat tubes of the second sub-heat exchange core 12 of the first heat exchanger core 1. The cross-sectional area of at least one heat exchange tube 8 of the second heat exchanger core 2 is greater than the cross-sectional area of at least one heat exchange tube 8 of the first heat exchanger sub-core 11 of the first heat exchanger core 1. Having the same fins and / or heat exchange tubes of the second heat exchanger core 2 as those of the second sub-heat exchange core 12 of the first heat exchanger core 1 can reduce manufacturing complexity.

[0036] In the embodiments of the present invention, see Figure 1 and Figure 2 The heat exchanger 100 further includes: a first wind baffle plate 31, which is located on one side of the second heat exchanger core 2 in the thickness direction of the second heat exchanger core 2, and the first wind baffle plate 31 at least partially overlaps with the orthographic projection of the second heat exchanger core 2 on the plane where the second heat exchanger core 2 is located.

[0037] In the embodiments of the present invention, see Figure 1 and Figure 2 The heat exchanger 100 further includes a connecting portion 5, through which the heat exchange tubes 8 of the first sub-heat exchange core 11 and the second sub-heat exchange core 12 of the first heat exchange core 1 are connected. The first wind baffle 31 is located on a side of the first sub-heat exchange core 11 of the first heat exchange core 1 away from the connecting portion 5 in the length direction of the heat exchange tubes 8 of the first sub-heat exchange core 11 of the first heat exchange core 1. According to an example of the present invention, the first wind baffle 31 and the first sub-heat exchange core 11 of the first heat exchange core 1 are located on the same side of the second sub-heat exchange core 12 of the first heat exchange core 1 in the thickness direction of the second sub-heat exchange core 12 of the first heat exchange core 1.

[0038] In the embodiments of the present invention, see Figure 2 The heat exchanger 100 further includes a second wind baffle 32, which at least partially overlaps with the orthographic projection of the first heat exchanger core 1 on the plane where the second sub-heat exchanger core 12 of the first heat exchanger core 1 is located. According to an example of the present invention, the first wind baffle 31 and the second wind baffle 32 are located on a side of the second sub-heat exchanger core 12 of the first heat exchanger core 1 opposite to the first sub-heat exchanger core 11 in the thickness direction of the second sub-heat exchanger core 12 of the first heat exchanger core 1. At the same inlet wind speed, the wind resistance of the second wind baffle 32 is less than or equal to the wind resistance of the first wind baffle 31.

[0039] In the embodiments of the present invention, see Figure 2 The heat exchanger 100 further includes: a third wind resistance plate 33, which is located between the first sub-heat exchanger core 11 and the second sub-heat exchanger core 12 of the first heat exchanger core 1 in the thickness direction of the second sub-heat exchanger core 12 of the first heat exchanger core 1.

[0040] In the embodiments of the present invention, see Figure 2 The heat exchanger 100 further includes: a first header 61 connected to the heat exchange tubes 8 of the second heat exchanger core 2 on a side of the second heat exchanger core 2 away from the second sub-heat exchanger core 12 of the first heat exchanger core 1; and a second header 62 connected to the heat exchange tubes 8 of the first sub-heat exchanger core 11 of the first heat exchanger core 1 on a side of the first sub-heat exchanger core 11 of the first heat exchanger core 1 away from the connecting portion 5. The cross-sectional area of the first header 61 may be larger than the cross-sectional area of the second header 62.

[0041] In the embodiments of the present invention, see Figure 1 and Figure 2 The connecting portion 5 includes a plurality of connecting pipes 51 , and the heat exchange pipes 8 of the first sub-heat exchange core 11 of the first heat exchanger core 1 and the heat exchange pipes 8 of the second sub-heat exchange core 12 of the first heat exchanger core 1 are respectively connected through the plurality of connecting pipes 51 .

[0042] In the embodiments of the present invention, see Figure 1 and Figure 2 , the first header 61 and the second header 62 are arranged horizontally during use.

[0043] In the embodiments of the present invention, see Figure 1 and Figure 2 The first header 61 is arranged horizontally during use, and the first header 61 is below the second heat exchanger core 2 during use.

[0044] In the embodiments of the present invention, see Figure 1 and Figure 2 In use, the first header 61 is below the second heat exchanger core 2 , and the second header 62 is below the second sub-heat exchanger core 12 of the first heat exchanger core 1 .

[0045] In the embodiments of the present invention, see Figure 1 and Figure 2 In use, the first header 61 is above the second heat exchanger core 2 , and the second header 62 is above the second sub-heat exchanger core 12 of the first heat exchanger core 1 .

[0046] In the embodiments of the present invention, see Figure 1 and Figure 2 In use, in the direction of air A flowing through the heat exchanger 100 , the second heat exchanger core 2 and the second sub-heat exchanger core 12 of the first heat exchanger core 1 are located upstream of the first sub-heat exchanger core 11 of the first heat exchanger core 1 .

[0047] In the embodiments of the present invention, see Figure 1 and Figure 2 In use, in the direction of air A flowing through the heat exchanger 100 , the second heat exchanger core 2 and the second sub-heat exchanger core 12 of the first heat exchanger core 1 are located downstream of the first sub-heat exchanger core 11 of the first heat exchanger core 1 .

[0048] Although the headers are described in conjunction with the figures, the headers may have any suitable shape and structure and are not limited to Figure 1 and Figure 2 The header shown in .

[0049] See also Figures 1 to 2According to an embodiment of the present invention, the heat exchanger 100 includes: a first row of heat exchanger cores 101 composed of the second sub-heat exchanger core 12 of the first heat exchanger core 1 and the second heat exchanger core 2, the first row of heat exchanger cores 101 including a plurality of heat exchange tubes 8; a second row of heat exchanger cores 102 composed of the first sub-heat exchanger cores 11 of the first heat exchanger core 1 and located on one side of the first row of heat exchanger cores 101 in the thickness direction of the first row of heat exchanger cores 101, the second row of heat exchanger cores 102 including a plurality of heat exchange tubes 8, the length of the heat exchange tubes 8 of the first row of heat exchanger cores 101 being greater than the length of the heat exchange tubes 8 of the second row of heat exchanger cores 102; and a connecting portion 5, the plurality of heat exchange tubes 8 of the first row of heat exchanger cores 101 and the plurality of heat exchange tubes 8 of the second row of heat exchanger cores 102 being connected through the connecting portion 5. The difference between the wind resistance of the heat exchanger 100 for air A passing through the second row of heat exchanger cores 102 and the wind resistance of the heat exchanger 100 for air A passing through the first row of heat exchanger cores 101 outside the second row of heat exchanger cores 102 is less than a predetermined value.

[0050] In the embodiments of the present invention, see Figure 1 and Figure 2 The connecting portion 5 includes a plurality of connecting tubes 51, through which the plurality of heat exchange tubes 8 of the first row of heat exchanger cores 101 are respectively connected to the plurality of heat exchange tubes 8 of the second row of heat exchanger cores 102. In the embodiment shown in the figure, the first row of heat exchanger cores 101 and the second row of heat exchanger cores 102 are formed by bending the same heat exchanger core, and the bent portion of the heat exchanger core constitutes the connecting portion 5. The connecting portion 5 may include heat exchange tubes serving as the plurality of connecting tubes 51 and fins arranged alternately with the plurality of connecting tubes 51.

[0051] In the embodiments of the present invention, see Figures 1 to 4The first row of heat exchanger cores 101 further includes a plurality of fins 9 arranged alternately with the plurality of heat exchange tubes 8; the second row of heat exchanger cores 102 further includes a plurality of fins 9 arranged alternately with the plurality of heat exchange tubes 8; and the density of the fins 9 of the second row of heat exchanger cores 102 is less than the density of the fins 9 of the first row of heat exchanger cores 101. If the density of the fins used in the second row of heat exchanger cores 102 is less than the density of the fins of the first row of heat exchanger cores 101, the wind resistance of the second row of heat exchanger cores 102 will be small. For another example, the density of the fins used in the portion of the first row of heat exchanger cores 101 that extends beyond the second row of heat exchanger cores 102 is greater than the density of the fins in the portion where the first row of heat exchanger cores 101 and the second row of heat exchanger cores 102 face each other, thereby increasing the wind resistance of this portion. This allows for approximately the same wind speed across the entire surface of the heat exchanger, thereby increasing the amount of heat exchanged. At least one of the first row of heat exchanger cores 101 and the second row of heat exchanger cores 102 may not include fins.

[0052] In the embodiments of the present invention, see Figure 1 and Figure 2 , the cross-sectional area of the heat exchange tubes 8 of the second row of heat exchanger cores 102 is smaller than the cross-sectional area of the heat exchange tubes 8 of the first row of heat exchanger cores 101 .

[0053] In the embodiments of the present invention, see Figure 1 and Figure 2 The heat exchanger 100 further includes a first wind baffle 31. The first wind baffle 31 is located on one side of the first row of heat exchanger cores 101 in the thickness direction of the first row of heat exchanger cores 101 and on the side of the second row of heat exchanger cores 102 away from the connection portion 5 in the length direction of the heat exchange tubes 8. The first wind baffle 31 is located near the first row of heat exchanger cores 101 to generate wind resistance, thereby making the wind field between the first row of heat exchanger cores 101 and the second row of heat exchanger cores 102 more uniform, thereby improving heat exchange.

[0054] In one embodiment of the present invention, see Figure 1 , the first wind resistance plate 31 and the second row of heat exchanger cores 102 are located on the same side of the first row of heat exchanger cores 101 in the thickness direction of the first row of heat exchanger cores 101. In another embodiment of the present invention, see Figure 2 , the first wind resistance plate 31 and the second row of heat exchanger cores 102 are located on different sides of the first row of heat exchanger cores 101 in the thickness direction of the first row of heat exchanger cores 101. Figure 1 As shown, the first wind baffle 31 can be placed on the windward side of the first row of heat exchanger cores 101. The size of the first wind baffle 31 is close to the size difference between the first row of heat exchanger cores 101 and the second row of heat exchanger cores 102.

[0055] In the embodiments of the present invention, see Figure 2 The heat exchanger 100 further includes: a second wind baffle 32. The first wind baffle 31 and the second wind baffle 32 are located on the side of the first row of heat exchanger cores 101 opposite to the second row of heat exchanger cores 102 in the thickness direction of the first row of heat exchanger cores 101. The second wind baffle 32 is located on the side of the first wind baffle 31 facing the connecting portion 5 in the length direction of the heat exchange tube 8. The wind resistance of the second wind baffle 32 is less than the wind resistance of the first wind baffle 31. Figure 1 As shown, air A flows through the first row of heat exchanger cores 101 and then flows through the first wind baffle 31 and the second wind baffle 32. The overall size of the first wind baffle 31 and the second wind baffle 32 can be close to the size of the heat exchanger 100.

[0056] In the embodiments of the present invention, see Figure 1 and Figure 2 The heat exchanger 100 further includes: a first header 61, which is connected to the multiple heat exchange tubes 8 of the first row of heat exchanger cores 101 on the side of the first row of heat exchanger cores 101 away from the connecting portion 5; and a second header 62, which is connected to the multiple heat exchange tubes 8 of the second row of heat exchanger cores 102 on the side of the second row of heat exchanger cores 102 away from the connecting portion 5.

[0057] In the embodiments of the present invention, see Figure 1 The heat exchanger 100 further includes: a third wind baffle 33 , wherein the third wind baffle 33 is located between the first row of heat exchanger cores 101 and the second header 62 in the thickness direction of the first row of heat exchanger cores 101 .

[0058] In an embodiment of the present invention, the wind resistance plate can also be airtight. The wind resistance plate can play a filtering role. The wind resistance plate can be a filter screen, a grid, a porous plate, etc. The wind resistance plate can be made of any material and can be metal, plastic, nylon, etc.

[0059] In the embodiments of the present invention, see Figure 1 and Figure 2 The first header 61 is arranged horizontally during use, and the first header 61 is below the first row of heat exchanger cores 101 during use.

[0060] In the embodiments of the present invention, see Figure 1 and Figure 2The first header 61 and the second header 62 are arranged horizontally or substantially horizontally during use. For example, during use, the first header 61 is below the first row of heat exchanger cores 101, and the second header 62 is below the second row of heat exchanger cores 102; or during use, the first header 61 is above the first row of heat exchanger cores 101, and the second header 62 is above the second row of heat exchanger cores 102. For example, during use, in the direction in which air A flows through the heat exchanger 100, the first row of heat exchanger cores 101 is upstream of the second row of heat exchanger cores 102; or during use, in the direction in which air A flows through the heat exchanger 100, the first row of heat exchanger cores 101 is downstream of the second row of heat exchanger cores 102.

[0061] During use, as air A flows through the heat exchanger 100, the first row of heat exchanger cores 101 is located upstream of the second row of heat exchanger cores 102. For example, when the heat exchanger is used as an evaporator, the refrigerant enters the heat exchanger 100 through the connecting pipe 72 connected to the second header 62, and the refrigerant can flow out of the heat exchanger 100 through the connecting pipe connected to the first header 61. The air and refrigerant exchange heat in countercurrent, which can increase the heat transfer rate. At the same time, with only a small reduction in heat transfer rate, a large amount of material is saved (only the material of the second row of heat exchanger cores 102 is removed). Compared to a single-row heat exchanger, this design can save space (along the length of the heat exchange tubes).

[0062] During operation, as air A flows through heat exchanger 100, first row heat exchanger cores 101 are located downstream of second row heat exchanger cores 102. When the heat exchanger is used as an evaporator (the air temperature is greater than the refrigerant temperature, second row heat exchanger cores 102 are the first row in the air flow direction, and first row heat exchanger cores 101 are the second row), refrigerant enters heat exchanger 100 through connecting tube 72 connected to second header 62 and can exit heat exchanger 100 through connecting tube 72 connected to first header 61. The air and refrigerant exchange heat in a co-current flow. By the time the refrigerant reaches the end of heat exchange tubes 8 of first row heat exchanger cores 101 (near first header 61), it must be superheated and its temperature must have risen. If the two rows of heat exchangers are the same length, the air must pass through the first row. After passing through the first row, the air temperature drops and it begins to pass through the second row. However, the refrigerant temperature in the second row has risen. In this way, the temperature difference between the air and the refrigerant is very small or even non-existent, which is not conducive to heat exchange and the refrigerant is less likely to overheat. This design can avoid this problem.

[0063] During operation, the first manifold 61 is located below the first row of heat exchanger cores 101. When the heat exchanger is used as a condenser, the refrigerant changes phase from gas to liquid along the flow direction, significantly increasing its density. If the first manifold 61 is located at the bottom, the liquid refrigerant can automatically flow to the bottom under the influence of gravity during the refrigerant phase change, thereby reducing the refrigerant's pressure drop along the entire length of the heat exchanger and increasing the heat transfer capacity of the heat exchanger.

[0064] During operation, the first manifold 61 is located above the first row of heat exchanger cores 101. When the heat exchanger is used as an evaporator, the refrigerant changes from a two-phase gas-liquid state to a pure gas along the flow direction, significantly reducing its density. If the first manifold 61 is located at the top, the gaseous refrigerant can automatically rise to the top during the phase change due to buoyancy, thereby reducing the pressure drop along the refrigerant and increasing the heat transfer capacity of the heat exchanger.

[0065] In the embodiments of the present invention, see Figure 1 and Figure 2 , the cross-sectional area of the first header 61 is larger than the cross-sectional area of the second header 62. For example, the diameter of the first header 61 is larger than the diameter of the second header 62, and the ratio of the diameter of the first header 61 to the diameter of the second header 62 is 2 to 1. When the diameter of the second header 62 is smaller, the distance between the multiple heat exchange tubes 8 of the first row of heat exchanger cores 101 and the multiple heat exchange tubes 8 of the second row of heat exchanger cores 102 can be made closer, thereby reducing the volume of the heat exchanger along the wind direction. The first header 61 is larger, which can reduce the pressure drop on the refrigerant side in the first header 61. If the heat exchanger is a condenser, the pressure drop of the refrigerant passing through the first header 61 is lower, then the saturated condensation temperature of the refrigerant in the heat exchange tube will be higher, so that the temperature difference with the air is larger, thereby increasing the heat exchange capacity.

[0066] In the embodiments of the present invention, see Figure 1 and Figure 2 When the heat exchanger 100 acts as an evaporator, the refrigerant enters the heat exchanger 100 from the connecting pipe 72 connected to the second header 62 .

[0067] In the embodiments of the present invention, see Figure 1 and Figure 2 The ratio of the length of the heat exchange tubes 8 of the first row of heat exchanger cores 101 to the length of the heat exchange tubes 8 of the second row of heat exchanger cores 102 is 0.1 to 1. The length of the heat exchange tubes 8 of the second row of heat exchanger cores 102 is greater than 100 mm.

[0068] By using the heat exchanger 100 according to the embodiment of the present invention, the performance of the heat exchanger 100 can be improved.

[0069] Although the above embodiments have been described, some features of the above embodiments may be combined to form new embodiments.

Claims

1. A heat exchanger comprising: a first heat exchanger core, the first heat exchanger core comprising: a first sub-heat exchanger core and a second sub-heat exchanger core, each of the first sub-heat exchanger core and the second sub-heat exchanger core comprising a heat exchange tube, the heat exchange tubes of the first sub-heat exchanger core and the second sub-heat exchanger core being connected to each other, and orthographic projections of the first sub-heat exchanger core and the second sub-heat exchanger core on a plane where the second sub-heat exchanger core is located at least partially overlapping; and a second heat exchanger core, wherein the second heat exchanger core comprises heat exchange tubes, and the heat exchange tubes of the second heat exchanger core are directly connected to the heat exchange tubes of the second sub-heat exchanger core of the first heat exchanger core; When the first heat exchanger core and the second heat exchanger core have the same structure and no wind resistance plate is installed, at the same inlet wind speed, the ratio of the wind resistance of the heat exchanger pair through the first heat exchanger core to the wind resistance of the heat exchanger pair through the second heat exchanger core is approximately 2.

2. The heat exchanger according to claim 1, wherein: Each of the first sub-heat exchanger core and the second sub-heat exchanger core of the first heat exchanger core further includes fins; The second heat exchanger core further includes fins; and At the same inlet wind speed, the wind resistance or pressure drop caused by at least a portion of at least one fin of the second heat exchanger core is greater than the wind resistance or pressure drop caused by at least a portion of at least one fin of the first heat exchanger core.

3. The heat exchanger according to claim 1, wherein: The cross-sectional area of at least one heat exchange tube of the second heat exchanger core is greater than the cross-sectional area of at least one heat exchange tube of the first heat exchanger core.

4. The heat exchanger according to claim 1, further comprising: The first wind baffle is located on one side of the second heat exchanger core in the thickness direction of the second heat exchanger core, and the first wind baffle at least partially overlaps with the orthographic projection of the second heat exchanger core on the plane where the second heat exchanger core is located.

5. The heat exchanger according to claim 4, further comprising: a connecting portion, through which the heat exchange tubes of the first sub-heat exchange core and the second sub-heat exchange core of the first heat exchange core are connected, The first wind baffle is located on a side of the first sub-heat exchanger core of the first heat exchanger core away from the connecting portion in the length direction of the heat exchange tube of the first sub-heat exchanger core of the first heat exchanger core.

6. The heat exchanger according to claim 5, wherein: The first wind resistance plate and the first sub-heat exchanger core of the first heat exchanger core are located on the same side of the second sub-heat exchanger core of the first heat exchanger core in the thickness direction of the second sub-heat exchanger core of the first heat exchanger core.

7. The heat exchanger according to claim 4, further comprising: The second wind baffle plate at least partially overlaps with an orthographic projection of the first heat exchanger core on a plane where the second sub-heat exchanger core of the first heat exchanger core is located.

8. The heat exchanger according to claim 7, wherein: The first wind baffle plate and the second wind baffle plate are located on the side of the second sub-heat exchanger core of the first heat exchanger core opposite to the first sub-heat exchanger core in the thickness direction of the second sub-heat exchanger core of the first heat exchanger core, and the wind resistance of the second wind baffle plate is less than or equal to the wind resistance of the first wind baffle plate at the same inlet wind speed.

9. The heat exchanger according to claim 1, further comprising: The third wind baffle is located between the first sub-heat exchanger core and the second sub-heat exchanger core of the first heat exchanger core in the thickness direction of the second sub-heat exchanger core of the first heat exchanger core.

10. The heat exchanger according to claim 1, further comprising: a connecting portion, through which heat exchange tubes of the first sub-heat exchange core and the second sub-heat exchange core of the first heat exchange core are connected; a first header connected to the heat exchange tubes of the second heat exchanger core at a side of the second heat exchanger core away from the second sub-heat exchanger core of the first heat exchanger core; as well as A second header is connected to the heat exchange tubes of the first sub-heat exchange core of the first heat exchange core at a side of the first sub-heat exchange core of the first heat exchange core away from the connecting portion.

11. The heat exchanger according to claim 10, wherein: A cross-sectional area of the first header is greater than a cross-sectional area of the second header.

12. The heat exchanger according to claim 5 or 10, wherein: The connecting portion includes a plurality of connecting pipes, and the heat exchange pipes of the first sub-heat exchange core of the first heat exchange core are respectively connected with the heat exchange pipes of the second sub-heat exchange core of the first heat exchange core through the plurality of connecting pipes.

13. The heat exchanger according to claim 1, wherein: At least one of the density of at least part of the fins, the width of the fins, the angle of the fin windows, the number of windows and the length of the windows of at least part of at least one fin of the second heat exchange core is greater than at least one of the density of at least part of the fins, the width of the fins, the angle of the fin windows, the number of windows and the length of the windows of at least one fin of the first heat exchange core.

14. An air conditioning system comprising: The heat exchanger according to claim 1.

15. The air conditioning system according to claim 14, wherein: The heat exchanger further comprises: a connecting portion, through which heat exchange tubes of the first sub-heat exchange core and the second sub-heat exchange core of the first heat exchange core are connected; a first header connected to the heat exchange tubes of the second heat exchanger core at a side of the second heat exchanger core away from the second sub-heat exchanger core of the first heat exchanger core; and A second header is connected to the heat exchange tubes of the first sub-heat exchange core of the first heat exchange core at a side of the first sub-heat exchange core of the first heat exchange core away from the connecting portion.

16. The air conditioning system according to claim 15, wherein: The first header and the second header are arranged horizontally during use.

17. The air conditioning system according to claim 14, wherein: The heat exchanger further comprises: a first header connected to the heat exchange tubes of the second heat exchanger core at a side of the second sub-heat exchanger core of the second heat exchanger core away from the first heat exchanger core; The first header is arranged horizontally during use, and is below the second heat exchanger core during use.

18. The air conditioning system according to claim 15, wherein: In use, the first header is below the second heat exchanger core, and the second header is below the second sub-heat exchanger core of the first heat exchanger core.

19. The air conditioning system according to claim 15, wherein: In use, the first header is above the second heat exchanger core, and the second header is above the second sub-heat exchanger core of the first heat exchanger core.

20. The air conditioning system according to claim 14, wherein: In use, in the direction of air flowing through the heat exchanger, the second heat exchanger core and the second sub-heat exchanger core of the first heat exchanger core are located upstream of the first sub-heat exchanger core of the first heat exchanger core.

21. The air conditioning system according to claim 14, wherein: In use, in the direction of air flowing through the heat exchanger, the second heat exchanger core and the second sub-heat exchanger core of the first heat exchanger core are located downstream of the first sub-heat exchanger core of the first heat exchanger core.

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