CN211119671U - Indoor unit of air conditioner and air conditioner - Google Patents

Abstract

The utility model provides an indoor unit of air conditioner, air conditioner. The air-conditioning indoor unit comprises a shell and a heat exchanger, wherein an air channel is formed in the shell, the heat exchanger is arranged in the air channel, when the airflow direction in the air channel is a first direction, the flow direction of a refrigerant in the heat exchanger is a second direction, when the airflow direction in the air channel is a second direction, the flow direction of the refrigerant in the heat exchanger is a first direction, the first direction is opposite to the second direction, so that the heat exchanger can form reverse flow with the air-conditioning indoor unit when the airflow direction of the heat exchanger is opposite, the heat exchanger comprises a first heat exchange tube group and a second heat exchange tube group, the first heat exchange tube group is connected with the second heat exchange tube group in parallel, and the flow direction of the refrigerant in the first heat exchange tube group is opposite to the flow direction in the second heat exchange tube group. The utility model provides a pair of machine, air conditioner in air conditioning can the different characteristics of the density of gaseous phase and liquid phase in the double-phase refrigerant of make full use of gas-liquid, reduces the tube side loss of refrigerant in the heat exchanger, promotes the heat exchange efficiency of heat exchanger.

Description

Indoor unit of air conditioner and air conditioner

Technical Field

The utility model belongs to the technical field of air conditioning, concretely relates to machine, air conditioner in air conditioning.

Background

Along with the improvement of living standards of people and the wide use of air conditioners, the requirements of people on the use comfort and energy conservation of the air conditioners are higher and higher, the function of the air inlet can be adapted to the working mode of the air conditioners through the design of the air inlet of the air conditioners, specifically, for example, under the heating working condition, the air inlet is used as an air inlet, the air flow direction is the first direction, under the cooling working condition, the air inlet is used as an air outlet, the air flow direction is the second direction, the first direction is just opposite to the second direction, the heat exchange efficiency of the air flow under different working conditions cannot be considered by the structure of the existing heat exchanger, for example, only the heat exchange efficiency under the heating working condition or only the heat exchange efficiency under the cooling working condition can be ensured, the heat exchange efficiency of the heat exchanger of the air conditioners can not be balanced under different working conditions, and the overall working performance of the air conditioners is lower, the comfort of the air conditioner needs to be improved.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model is to provide an indoor set of air conditioner, can the different characteristics of density of gaseous phase and liquid phase in the double-phase refrigerant of make full use of gas-liquid, reduce the tube side loss of refrigerant in the heat exchanger, promote the heat exchange efficiency of heat exchanger.

In order to solve the above problem, the present invention provides an air-conditioning indoor unit, including a casing and a heat exchanger, wherein an air duct is provided inside the casing, the heat exchanger is located in the air duct, when the air flow direction in the air duct is a first direction, the refrigerant flow direction in the heat exchanger is a second direction, when the air flow direction in the air duct is a second direction, the refrigerant flow direction in the heat exchanger is a first direction, the first direction is opposite to the second direction, so that the heat exchanger can also form a reverse flow with the air-conditioning indoor unit when the air flow direction of the air-conditioning indoor unit is opposite, the heat exchanger includes a first heat exchange tube set and a second heat exchange tube set, the first heat exchange tube set and the second heat exchange tube set are arranged up and down along the height direction of the heat exchanger, the first heat exchange tube set and the second heat exchange tube set are connected in parallel, in the height direction of the heat exchanger, the flow direction of the refrigerant in the first heat exchange tube group is opposite to the flow direction of the refrigerant in the second heat exchange tube group.

Preferably, the first heat exchange tube group includes a first tube bank and a second tube bank, the first tube bank is communicated with the top of the second tube bank in series, the second heat exchange tube group includes a third tube bank and a fourth tube bank, the third tube bank is communicated with the bottom of the fourth tube bank in series, the first tube bank and the third tube bank are located on a first heat exchange surface of the heat exchanger, the second tube bank and the fourth tube bank are located on a second heat exchange surface of the heat exchanger, and the first heat exchange surface and the second heat exchange surface are arranged oppositely and perpendicular to the flow direction of heat exchange air flow.

Preferably, the first heat exchange tube group and/or the second heat exchange tube group are formed by connecting a plurality of U-shaped tubes in series, and the projections of the U-shaped tubes in the first tube row and the U-shaped tubes in the second tube row in the direction along the airflow direction are staggered; and/or projections of the third tube row and the fourth tube row in the direction along the airflow direction are staggered.

Preferably, the first heat exchange tube group has a first cross section in the airflow flowing direction, and the first tube row and the second tube row form a U-shape with an opening facing downwards on the first cross section; the second heat exchange tube group is provided with a second cross section in the airflow flowing direction, and the third tube row and the fourth tube row form a U shape with an upward opening on the second cross section.

Preferably, the first heat exchange tube group and the second heat exchange tube group are respectively provided with a plurality of groups, and the plurality of groups of the first heat exchange tube group and the second heat exchange tube group are sequentially, alternately and adjacently arranged in the height direction.

Preferably, the refrigerant main tube passes of the first heat exchange tube sets at different height positions in the heat exchanger are different.

Preferably, the heat exchanger has a plurality of heat exchange surfaces, and the plurality of heat exchange surfaces can exchange heat for air flows in different directions respectively.

Preferably, the heat exchanger is in a C-shape or a G-shape in a plane perpendicular to the heat exchange surface.

Preferably, the heat exchanger further comprises a shell, an air duct is arranged inside the shell, a first air opening and a second air opening are formed in one end of the air duct, and the heat exchanger is arranged at the first air opening or the second air opening.

Preferably, the first air opening and/or the second air opening are provided with a plurality of air openings, and the plurality of air openings and/or the second air openings are respectively arranged corresponding to the plurality of heat exchange surfaces of the heat exchanger in a one-to-one manner.

Preferably, the first air opening is located at the lower end of the air duct, the heat exchanger is arranged at the first air opening, a water pan is arranged at the lower part of the heat exchanger, and the position of the first heat exchange tube group with the large refrigerant main tube pass in the heat exchanger is higher than the position of the first heat exchange tube group with the small refrigerant main tube pass.

The utility model also provides an air conditioner, machine in the foretell air conditioning.

The utility model provides a pair of machine in air conditioning, air conditioner, because the flow direction of refrigerant is opposite in the flow direction of refrigerant in first heat exchange tube group and the flow direction of refrigerant in the second heat exchange tube group in the heat exchanger direction of height, this kind of direction of height refrigerant flow direction's opposite has directly injectd the refrigerant must possess under same state and has risen to flow and descend to flow, it is specific, during refrigerant rises to flow in the first heat exchange tube group, refrigerant descends to flow in the second heat exchange tube group, consequently, it is when the air conditioner is in refrigeration operating mode or heating operating mode, first heat exchange tube group in the heat exchanger, heat exchange tube group of a type can make full use of gas phase refrigerant density little characteristic rise in-process have less tube side resistance, or heat exchange tube group of another type can make full use of liquid phase refrigerant density big characteristic decline in-process can rely on the dead weight to descend, thereby make the heat exchanger can make full use of the heat exchange efficiency of characteristic promotion heat exchanger behind And the air conditioner takes the refrigeration working condition and the heating working condition into consideration, and is particularly suitable for the working condition that the flow direction of the heat exchange airflow of the heat exchanger is reversible.

Drawings

Fig. 1 is a schematic structural diagram of a heat exchanger according to an embodiment of the present invention (when the airflow is in a first direction);

fig. 2 is a schematic structural diagram of a heat exchanger according to an embodiment of the present invention (when the airflow is in the second direction);

fig. 3 is an external view of a heat exchanger according to an embodiment of the present invention;

FIG. 4 is a schematic top view of the structure of FIG. 3;

fig. 5 is a schematic structural view of an indoor unit of an air conditioner according to another embodiment of the present invention.

The reference numerals are represented as:

1. a first heat exchange tube set; 11. a first tube bank; 12. a second tube bank; 2. a second heat exchange tube set; 21. a third tube bank; 22. a fourth tube bank; 3. a U-shaped pipe; 4. a heat exchange surface; 100. a heat exchanger; 101. a housing; 102. an air duct; 103. a first tuyere; 104. a second tuyere; 105. a fan.

Detailed Description

Referring to fig. 1 to 5 in combination, according to an embodiment of the present invention, there is provided an indoor unit of an air conditioner, including a casing 101, a heat exchanger 100, the housing 101 has an air duct 102 therein, the heat exchanger 100 is disposed in the air duct 102, when the airflow direction in the air duct 102 is the first direction, the refrigerant flow direction in the heat exchanger 100 is the second direction, when the airflow direction in the air duct 102 is a second direction, the flow direction of the refrigerant in the heat exchanger 100 is a first direction, the first direction is opposite to the second direction, so that the heat exchanger 100 can form a counter flow with the air-conditioning indoor unit when the airflow direction of the air-conditioning indoor unit is opposite, and the flow direction of a refrigerant in the heat exchanger can form a counter flow with the airflow direction no matter the air-conditioner is in a heating mode or a cooling mode, thereby improving the heat exchange efficiency of the heat exchanger and the energy efficiency of the air-conditioner; specifically, the heat exchanger includes a first heat exchange tube set 1 (shown by a dotted line in fig. 1) and a second heat exchange tube set 2 (shown by a dotted line in fig. 1), the first heat exchange tube set 1 and the second heat exchange tube set 2 are arranged up and down along a height direction of the heat exchanger, the first heat exchange tube set 1 and the second heat exchange tube set 2 are connected in parallel, and a flow direction of a refrigerant in the first heat exchange tube set 1 is opposite to a flow direction of a refrigerant in the second heat exchange tube set 2 in the height direction of the heat exchanger. In the technical scheme, because the flow direction of the refrigerant in the first heat exchange tube group 1 is opposite to the flow direction of the refrigerant in the second heat exchange tube group 2 in the height direction of the heat exchanger, the flow direction of the refrigerant in the height direction is opposite to directly limit that the refrigerant inevitably has ascending flow and descending flow in the same state, specifically, as shown in figure 1, when the refrigerant in the first heat exchange tube group 1 ascends and flows, the refrigerant in the second heat exchange tube group 2 descends and flows, therefore, when an air conditioner is in a refrigerating working condition or a heating working condition, one type of heat exchange tube group in the first heat exchange tube group 1 and the second heat exchange tube group 2 in the heat exchanger can fully utilize the small density characteristic of a gas-phase refrigerant to have smaller tube pass resistance in the ascending process, or the other type of heat exchange tube group can fully utilize the large density characteristic of a liquid-phase refrigerant to descend depending on the dead weight in the descending process, so that the heat exchanger can fully utilize the characteristic of the gas-liquid-, and the air conditioner takes the refrigeration working condition and the heating working condition into consideration, and is particularly suitable for the working condition that the heat exchange airflow of the heat exchanger is reversible.

As a specific implementation manner, preferably, as shown in fig. 1, the first heat exchange tube group 1 includes a first tube bank 11 and a second tube bank 12, the first tube bank 11 is in series communication with the top or bottom of the second tube bank 12, the second heat exchange tube group 2 includes a third tube bank 21 and a fourth tube bank 22, the third tube bank 21 is in series communication with the bottom or top of the fourth tube bank 22, the first tube bank 11 and the third tube bank 21 are located on a first heat exchange surface (for example, an inner tube bank of a heat exchanger) of the heat exchanger, the second tube bank 12 and the fourth tube bank 22 are located on a second heat exchange surface (for example, an outer tube bank of a heat exchanger) of the heat exchanger, and the first heat exchange surface and the second heat exchange surface are disposed opposite to each other and perpendicular to a flow direction of the heat exchange air flow. More specifically, the first heat exchange tube group 1 has a first cross section in the airflow flowing direction, and the first tube row 11 and the second tube row 12 form a U-shape with an opening facing downward on the first cross section; the second heat exchange tube group 2 has a second cross section in the airflow flowing direction, and the third tube row 21 and the fourth tube row 22 form a U-shape with an upward opening on the second cross section. In the technical scheme, on one hand, the first tube bank 11, the third tube bank 21, the second tube bank 12 and the fourth tube bank 22 are respectively located on an air inlet side and an air outlet side of an air flow, so that a counter flow can be formed by fully utilizing a relative relation between a refrigerant flow direction and the air flow direction, and further the heat exchange efficiency of a heat exchanger and the energy efficiency of an air conditioner are improved, specifically, as shown in fig. 1 and fig. 2, fig. 1 shows that the air flow direction (from right to left in the direction shown in fig. 1, that is, a first direction) is formed when the air conditioner is in a refrigeration working condition, and at this time, the refrigerant in the corresponding heat exchanger flows from the first tube bank 11 and the third tube bank 21 (inner tube bank) to the second tube bank 12 and the fourth tube bank 22 (outer tube bank) to form a counter flow of the refrigerant and the air flow direction; fig. 2 shows the airflow direction (from left to right of the orientation shown in fig. 2, that is, the second direction) when the air conditioner is in the heating condition, and at this time, the refrigerant in the corresponding heat exchanger flows from the second tube bank 12, the fourth tube bank 22 (the outer tube bank) to the first tube bank 11, and the third tube bank 21 (the inner tube bank), so as to form a counter flow between the refrigerant and the airflow direction; on the other hand, the density characteristics of the gas-liquid two-phase refrigerant can be fully utilized to reduce the corresponding tube pass resistance and reduce the pressure loss, taking the flow direction of the heat exchange airflow of the air conditioner under the heating working condition as a second direction as an example, the refrigerant inlet of each first heat exchange tube group 1 in fig. 2 is a high-temperature gas phase, the gas-phase refrigerant has the advantage of upward floating flow due to low density, after heat exchange of a plurality of U-shaped tubes 3, the high-temperature gas phase refrigerant forms a partial liquid phase, the formed liquid phase refrigerant flows to the first tube row 11 through the serial through part of the second tube row 12 and the first tube row 11, the density of the liquid phase refrigerant is high, and at least part of the liquid phase refrigerant flows downwards along the first tube row 11 by utilizing the self gravity, so that the pass resistance of the refrigerant in the first heat exchange tube group 1 is greatly reduced, and the pressure drop (pressure loss) of the refrigerant is smaller, thereby improving the heat exchange efficiency of the heat exchanger; and when being in the refrigeration operating mode to the air conditioner, promote the heat exchange efficiency of heat exchanger and then rely on the design of second heat transfer nest of tubes 2, its principle is similar with aforementioned, and it is no longer repeated here.

Preferably, the first heat exchange tube group 1 and/or the second heat exchange tube group 2 are formed by a plurality of U-shaped tubes 3 connected in series, and the projections of the U-shaped tubes 3 in the first tube bank 11 and the U-shaped tubes 3 in the second tube bank 12 in the direction along the airflow flow direction are staggered; and/or the projections of the third tube row 21 and the fourth tube row 22 in the direction along the airflow direction are staggered. Specifically, as shown in fig. 1, the U-shaped tubes 3 in the first tube bank 11 on the left side of the illustrated orientation are staggered from the U-shaped tubes 3 in the second tube bank 12 on the right side in the height direction by approximately the diameter of one U-shaped tube, and such staggered arrangement can make the air flow contact with the U-shaped tubes 3 more sufficiently, thereby effectively improving the heat exchange efficiency of the heat exchanger.

Preferably, the first heat exchange tube group 1 and the second heat exchange tube group 2 are respectively provided with a plurality of groups, the plurality of groups of the first heat exchange tube group 1 and the second heat exchange tube group 2 are sequentially and alternately arranged adjacently in the height direction, at this time, the plurality of groups of the first heat exchange tube group 1 and the second heat exchange tube group 2 are respectively provided with a refrigerant inlet and a refrigerant outlet which can be connected through corresponding current collectors or current dividers, so as to form uniform distribution of refrigerants in the air conditioning system, and the plurality of groups of the first heat exchange tube groups 1 are mutually formed in parallel, thereby effectively reducing the main pipe pass of the refrigerants, and further improving the heat exchange efficiency of the heat exchanger.

Preferably, refrigerant main pipe passes of the first heat exchange pipe group 1 at different height positions in the heat exchanger are different, and more specifically, for example, the refrigerant main pipe pass of the first heat exchange pipe group 1 or the second heat exchange pipe group 2 at a higher position in the heat exchanger is greater than or less than the refrigerant main pipe pass of the first heat exchange pipe group 1 or the second heat exchange pipe group 2 at a lower position, which is specifically determined according to a flow rate change of an airflow along a height change of the heat exchanger, and a corresponding specific embodiment will be given in combination with a subsequent air conditioner, and will not be described herein again.

Fig. 3 and 4 show a specific structure of an embodiment of the present invention, specifically, the heat exchanger has a plurality of heat exchange surfaces 4, and the plurality of heat exchange surfaces 4 are respectively capable of exchanging heat for air flows in different directions, for example, a heat exchanger similar to a C-shaped or G-shaped structure shown in the figure, i.e. on a plane perpendicular to the heat exchange surfaces 4, the heat exchanger 100 has a C-shaped or G-shaped shape, and can be applied to an air conditioner having a C-shaped or annular air opening, so as to greatly increase the heat exchange area of the heat exchanger, as a more preferred embodiment, the heat exchange surfaces 4 are 4 shown in fig. 3 and 4, and at this time, the 4 heat exchange surfaces 4 can be respectively used for exchanging heat for air flows in 4 directions around the heat exchanger.

According to an embodiment of the present invention, as shown in fig. 5, there is further provided an indoor unit of an air conditioner, including a heat exchanger 100, where the heat exchanger 100 is the above heat exchanger, specifically, the indoor unit of an air conditioner further includes a casing 101, an air duct 102 is provided inside the casing 101, one end of the air duct 102 has a first air opening 103 and a second air opening 104, the heat exchanger 100 is disposed at the first air opening 103 or the second air opening 104, as shown in fig. 5, the heat exchanger 100 is disposed at the first air opening 103, specifically, the first air opening 103 is disposed at a lower portion of the casing 101 and has a plurality of air openings, the plurality of air openings are disposed around a circumferential direction of the casing 101, the fan 105 rotates in a first direction, for example, so that an external air flow can flow out through the first air opening 103, the heat exchanger 100, the air duct 102, and the second air opening 104 to form an air circulation, at this time, corresponding to the cooling condition of the air conditioner, and at this time, correspondingly controlling the refrigerant in the heat exchanger 100 to flow from the first tube bank 11 (inside the heat exchanger 100 in fig. 5) to the second tube bank 12 (outside the heat exchanger 100 in fig. 5), so as to make the refrigerant and the air flow form a reverse flow, in the same way, when the fan 105 rotates in the first direction, for example, so that the external air flow can flow out through the second air opening 104, the air duct 102, the heat exchanger 100 and the first air opening 103 to form an air circulation, corresponding to the heating working condition of the air conditioner, and at this time, the refrigerant in the heat exchanger 100 is correspondingly controlled to flow from the second tube bank 12 (outside the heat exchanger 100 in fig. 5) to the first tube bank 11 (inside the heat exchanger 100 in fig. 5), therefore, the refrigerant and the air flow form reverse flow, and the heat exchanger 100 can have better heat exchange efficiency when the air conditioner is in a heating working condition or a refrigerating working condition. The first air openings 103 and/or the second air openings 104 are multiple, and the multiple first air openings 103 and/or the multiple second air openings 104 are respectively arranged in a one-to-one correspondence manner with the multiple heat exchange surfaces 4 of the heat exchanger 100.

Furthermore, the first air opening 103 is located on the lower end side of the air duct 102, the heat exchanger 100 is disposed at the first air opening 103, a water pan is disposed at the lower portion of the heat exchanger 100, and the water pan is used for receiving condensed water formed by the heat exchanger 100, the position of the first heat exchange tube group 1 or the second heat exchange tube group 2 with a large refrigerant main tube pass in the heat exchanger 100 is higher than the position of the first heat exchange tube group 1 or the second heat exchange tube group 2 with a small refrigerant main tube pass, the refrigerant main tube pass refers to tube passes of all U-shaped tubes 3 in the first heat exchange tube group 1 or the second heat exchange tube group 2, and in general, the structural style and specification of the U-shaped tubes 3 adopted in one heat exchanger are consistent, at this time, for example, as shown in fig. 2, at this time, the first air opening 103 is air outlet corresponding to an air conditioner, and because heat exchanger 100 lower extreme department quilt the water collector shutoff leads to the air-out great at the wind pressure static pressure of lower position to make the air-out air current of first wind gap 103 great and the higher position velocity of flow of velocity of flow great in height, and through aforementioned technical scheme, in the big position of the 100 velocity of flow of heat exchanger, set up less U type pipe, in the position that the velocity of flow is little, then set up more U type pipe, so that 100 refrigerant outlet temperature of heat exchanger keep the unanimity, so the whole heat transfer effect of heat exchanger is better, also can not be because the difference in temperature is too big during the refrigeration, the condition of condensation appears. Specifically, for example, as shown in fig. 2, a first group to a fourth group of heat exchange tube sets (possibly, the first heat exchange tube set 1 may also be the second heat exchange tube set 2) are respectively defined from top to bottom with the orientation shown in the figure, wherein the fourth group has 5U-shaped tubes 3 (i.e., a refrigerant main tube pass), which are respectively an inner row of 3 tubes and an outer row of 2 tubes; the third group is provided with 5U-shaped tubes 3 (namely, a refrigerant main tube pass), and the number of the tubes is 2 in the inner row and 3 in the outer row; the second group and the first group respectively have 6U-shaped tubes 3 (i.e. refrigerant main tube pass), and 3 inner rows and 3 outer rows, respectively, when the first air port 103 is used as an air outlet (the air conditioner is in a heating condition), due to the plugging action of a lower water receiving tray, a wind pressure static pressure is formed, so that the airflow velocity of the first air port 103 from bottom to top in height decreases progressively, that is, the airflow velocity at a position with a lower height is larger and the airflow velocity at a position with a higher height is smaller, correspondingly, the first heat exchange tube group 1 has fewer U-shaped tubes 3 (e.g. 5U-shaped tubes 3 in the third group and the fourth group) at a position with a larger airflow velocity, and has more U-shaped tubes 3 (e.g. 6U-shaped tubes in the first group and the second group) at a position with a smaller airflow.

It should be noted that the cross sections given in fig. 1 and fig. 2 are cross sections of the heat exchanger in the airflow direction, wherein circles show end faces of the U-shaped tubes 3, and a connection between two adjacent circles through a dotted line shows one U-shaped tube 3.

According to the utility model discloses an embodiment still provides an air conditioner, machine in the foretell air conditioning.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (12)

1. An air-conditioning indoor unit is characterized by comprising a shell (101) and a heat exchanger (100), wherein an air duct (102) is arranged in the shell (101), the heat exchanger (100) is positioned in the air duct (102), when the airflow direction in the air duct (102) is a first direction, the flow direction of a refrigerant in the heat exchanger (100) is a second direction, when the airflow direction in the air duct (102) is a second direction, the flow direction of the refrigerant in the heat exchanger (100) is a first direction, the first direction is opposite to the second direction, so that the heat exchanger (100) can form a reverse flow with the heat exchanger (100) when the airflow direction of the air-conditioning indoor unit is opposite, the heat exchanger (100) comprises a first heat exchange pipe set (1) and a second heat exchange pipe set (2), the first heat exchange pipe set (1) and the second heat exchange pipe set (2) are arranged up and down along the height direction of the heat exchanger (100), the first heat exchange tube set (1) and the second heat exchange tube set (2) are connected in parallel, and in the height direction of the heat exchanger (100), the flow direction of a refrigerant in the first heat exchange tube set (1) is opposite to the flow direction of the refrigerant in the second heat exchange tube set (2).

2. An air conditioning indoor unit according to claim 1, wherein the first heat exchange tube group (1) comprises a first tube bank (11) and a second tube bank (12), the first tube bank (11) and the top of the second tube bank (12) are communicated in series, the second heat exchange tube group (2) comprises a third tube bank (21) and a fourth tube bank (22), the third tube bank (21) and the bottom of the fourth tube bank (22) are communicated in series, the first tube bank (11) and the third tube bank (21) are on a first heat exchange surface of the heat exchanger (100), the second tube bank (12) and the fourth tube bank (22) are on a second heat exchange surface of the heat exchanger (100), and the first heat exchange surface and the second heat exchange surface are arranged oppositely and perpendicular to the flow direction of the heat exchange air flow.

3. An air-conditioning indoor unit according to claim 2, characterized in that the first heat exchange tube group (1) and/or the second heat exchange tube group (2) is formed by a plurality of U-shaped tubes (3) connected in series, and the projections of the U-shaped tubes (3) in the first tube row (11) and the U-shaped tubes (3) in the second tube row (12) in the direction along the airflow direction are staggered; and/or the projections of the third tube row (21) and the fourth tube row (22) in the direction along the airflow direction form an interlace.

4. An air-conditioning indoor unit according to claim 2, characterized in that the first heat exchange tube group (1) has a first cross section in the airflow flowing direction, and the first tube row (11) and the second tube row (12) form a U-shape with an opening facing downward on the first cross section; the second heat exchange tube group (2) has a second cross section in the airflow flowing direction, and the third tube row (21) and the fourth tube row (22) form an upward-opening U-shape on the second cross section.

5. The indoor unit of air conditioner according to claim 1, wherein the first heat exchange tube group (1) and the second heat exchange tube group (2) have a plurality of sets, and the plurality of sets of the first heat exchange tube group (1) and the second heat exchange tube group (2) are alternately and adjacently arranged in the height direction.

6. The indoor unit of air conditioner as claimed in claim 5, wherein the first heat exchange tube sets (1) at different height positions in the heat exchanger (100) have different refrigerant total tube passes.

7. The indoor unit of air conditioner according to any one of claims 1 to 6, wherein the heat exchanger (100) has a plurality of heat exchange surfaces (4), and the plurality of heat exchange surfaces (4) are respectively capable of exchanging heat with respect to air flows in different directions.

8. Air conditioning indoor unit according to claim 7, characterized in that the shape of the heat exchanger (100) is C-shaped or G-shaped in a plane perpendicular to the heat exchange surface (4).

9. The indoor unit of air conditioner as claimed in claim 1, wherein one end of the air duct (102) has a first air opening (103) and a second air opening (104), and the heat exchanger (100) is disposed at the first air opening (103) or the second air opening (104).

10. The indoor unit of air conditioner according to claim 9, wherein the first air opening (103) and/or the second air opening (104) has a plurality of air openings, and the plurality of air openings (103) and/or the plurality of air openings (104) are arranged in one-to-one correspondence with the plurality of heat exchange surfaces (4) of the heat exchanger (100).

11. The indoor unit of air conditioner as claimed in claim 9, wherein the first air opening (103) is located at the lower end of the air duct (102), the heat exchanger (100) is disposed at the first air opening (103), a water pan is disposed at the lower part of the heat exchanger (100), and the position of the first heat exchange tube set (1) with large refrigerant main tube pass in the heat exchanger (100) is higher than the position of the first heat exchange tube set (1) with small refrigerant main tube pass.

12. An air conditioner comprising an indoor unit of an air conditioner, characterized in that the indoor unit of an air conditioner is the indoor unit of an air conditioner according to any one of claims 8 to 11.

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