Indoor unit of air conditioner

Abstract

The utility model discloses an air conditioner indoor unit, and belongs to the technical field of air conditioners. The air conditioner indoor unit comprises a heat exchanger. The heat exchanger comprises a first heat exchange part, a second heat exchange part, a third heat exchange part and a main heat exchange pipe. The first heat exchange part is arranged close to the front side of the machine shell. The lower end of the second heat exchange part is connected to the upper end of the first heat exchange part; the upper end of the second heat exchange part faces the top and the rear side of the machine shell. The third heat exchange part is arranged close to the rear side of the machine shell. The upper end of the third heat exchange part is connected to the upper end of the second heat exchange part, and the lower end of the third heat exchange part faces the bottom of the machine shell. The main heat exchange pipes are arranged on the first heat exchange part, the second heat exchange part and the third heat exchange part correspondingly, and the main heat exchange pipes located at the lower ends of the first heat exchange part and the second heat exchange part jointly define a first flow path; the first flow path comprises a plurality of first branches which are arranged in parallel; when the heat exchanger is an evaporator, the first branch close to the lower end of the first heat exchange part flows to the windward side of the first heat exchange part from the leeward side of the first heat exchange part.

Description

Technical Field

[0001] This application relates to the technical field of air conditioners, and particularly to an indoor unit of an air conditioner. Background Art

[0002] The heat exchanger is an important component of the indoor unit of an air conditioner. There are heat exchange tubes arranged in the heat exchanger, and a number of flow paths are defined by the heat exchange tubes. Refrigerant flows in the flow paths to achieve heat exchange. In the existing air conditioner heat exchangers, it is difficult to evenly distribute the refrigerant flow rate in each flow path inside the heat exchanger, which may affect the energy efficiency of the heat exchanger. Moreover, when the refrigerant states in each branch are quite different, there is also a risk of condensation easily occurring. Summary of the Utility Model

[0003] Aiming at the deficiencies in the related art, this application provides an indoor unit of an air conditioner. By adjusting the flow direction of the refrigerant at the position with a relatively high wind speed of the heat exchanger, the heat exchange efficiency at the position with a relatively high wind speed is reduced to prevent local overheating of the heat exchanger.

[0004] This application provides an indoor unit of an air conditioner, including:

[0005] A housing, which includes a housing air inlet and a housing air outlet. The housing air inlet is opened at the top of the housing, and the housing air outlet is opened at the front bottom of the housing;

[0006] A fan, which is arranged inside the housing and is used to introduce air from the housing air inlet into the housing interior, and to output the air inside the housing from the housing air outlet to the outside of the housing;

[0007] A heat exchanger, which is arranged inside the housing and is used to exchange heat with the air passing through it; At least part of the windward side of the heat exchanger is arranged facing the housing air inlet; The leeward side of the heat exchanger is arranged facing the fan;

[0008] The heat exchanger further includes:

[0009] A first heat exchange part, which is arranged close to the front side of the housing;

[0010] A second heat exchange part, the lower end of the second heat exchange part is connected to the upper end of the first heat exchange part; The upper end of the second heat exchange part is arranged facing the top and the rear side of the housing;

[0011] A third heat exchange part, which is arranged close to the rear side of the housing; The upper end of the third heat exchange part is connected to the upper end of the second heat exchange part, and the lower end of the third heat exchange part is arranged facing the bottom of the housing;

[0012] Main heat exchange tubes, which are respectively arranged in the first heat exchange part, the second heat exchange part and the third heat exchange part. The main heat exchange tubes located in the first heat exchange part and the lower end of the second heat exchange part jointly define a first flow path; The main heat exchange tubes located at the upper end of the second heat exchange part and the third heat exchange part jointly define a second flow path, and the second flow path and the first flow path are communicated with each other;

[0013] Among them, the first flow path includes a plurality of first branches, and the plurality of first branches are arranged in parallel; when the heat exchanger is an evaporator, in the first branch near the lower end of the first heat exchange part, the refrigerant flows from the leeward side of the first heat exchange part to the windward side of the first heat exchange part.

[0014] In this technical solution, by adjusting the flow direction of the refrigerant in the first branch at the position with a higher wind speed of the heat exchanger, when the heat exchanger is an evaporator, the first branch near the lower end of the first heat exchange part flows from the leeward side of the first heat exchange part to the windward side of the first heat exchange part, so as to reduce the heat exchange efficiency of the first branch near the lower end of the first heat exchange part and avoid local overheating of the heat exchanger.

[0015] In some embodiments, the plurality of first branches are arranged along a first direction, and the first direction is from the lower end of the first heat exchange part to the upper end of the second heat exchange part along the windward surface of the heat exchanger; the first branch includes a first port and a second port, and the refrigerant flows from the first port to the second port, or the refrigerant flows from the second port to the first port; the first port of the first branch near the lower end of the first heat exchange part is arranged near the leeward side of the first heat exchange part, and the second port of the first branch near the lower end of the first heat exchange part is arranged near the windward side of the first heat exchange part.

[0016] In some embodiments, the second flow path includes a plurality of second branches, and the plurality of second branches are arranged in parallel with each other; when the heat exchanger is an evaporator, the second branch flows from the windward side of the heat exchanger to the leeward side of the heat exchanger; when the heat exchanger is a condenser, the second branch flows from the leeward side of the heat exchanger to the windward side of the heat exchanger.

[0017] In some embodiments, the heat exchanger includes a first auxiliary heat exchange part, and the first auxiliary heat exchange part is arranged on the windward side of the heat exchanger and is used to increase the heat exchange area of the heat exchanger.

[0018] In this technical solution, by arranging the first auxiliary heat exchange part on the windward side of the heat exchanger to increase the heat exchange area of the heat exchanger, thereby increasing the heat exchange efficiency of the heat exchanger.

[0019] In some embodiments, the first auxiliary heat exchange part includes a first auxiliary heat exchange tube, and the first auxiliary heat exchange tube defines a third flow path, and the third flow path is communicated with the second flow path and the first flow path.

[0020] In this technical solution, by making the first auxiliary heat exchange tube define a third flow path to extend the flow path of the refrigerant, thereby increasing the heat exchange efficiency of the heat exchanger.

[0021] In some embodiments, the third flow path includes a third port and a fourth port, the third port is arranged at a position of the first auxiliary heat exchange part near the lower end of the third heat exchange part, and the fourth port is arranged at a position of the first auxiliary heat exchange part near the lower end of the first heat exchange part.

[0022] In some of these embodiments, the pipe diameter of the first auxiliary heat exchange pipe is greater than or equal to the pipe diameter of the main heat exchange pipe.

[0023] In some of these embodiments, the heat exchanger includes a second auxiliary heat exchange part, which is arranged on the windward side of the first heat exchange part and the windward side of the second heat exchange part to increase the heat exchange area of the heat exchanger.

[0024] By arranging the second auxiliary heat exchange part on the windward side of the heat exchanger, the heat exchange area of the heat exchanger is increased, thereby increasing the heat exchange efficiency of the heat exchanger.

[0025] In some of these embodiments, the second auxiliary heat exchange part includes second auxiliary heat exchange pipes. The part of the second auxiliary heat exchange pipes located on the windward side of the first heat exchange part and the part located on the windward side of the second heat exchange part are used to form a first flow path; another part of the second auxiliary heat exchange pipes located on the windward side of the second heat exchange part is used to form a second flow path.

[0026] This application also provides an air conditioner indoor unit, including:

[0027] A casing, which includes a casing air inlet and a casing air outlet. The casing air inlet is opened at the top of the casing, and the casing air outlet is opened at the front bottom of the casing;

[0028] A fan, which is arranged inside the casing and is used to introduce air from the casing air inlet into the casing and output the air inside the casing from the casing air outlet to the outside of the casing;

[0029] A heat exchanger, which is arranged inside the casing and is used to exchange heat for the air passing through it; the heat exchanger is arranged along the length direction of the casing; at least part of the heat exchanger is arranged close to the casing air inlet; the leeward side of the heat exchanger faces the fan;

[0030] The heat exchanger further includes:

[0031] A first heat exchange part, which is arranged close to the front side of the casing; the lower end of the first heat exchange part is arranged close to the bottom of the casing;

[0032] A second heat exchange part, which is connected to the upper end of the first heat exchange part; the upper end of the second heat exchange part is arranged close to the top and the rear side of the casing;

[0033] A third heat exchange part, which is connected to the upper end of the second heat exchange part, and the lower end of the third heat exchange part faces the rear side and the bottom of the casing;

[0034] A second auxiliary heat exchange part, which is arranged on the windward side of the first heat exchange part and the second heat exchange part;

[0035] A first auxiliary heat exchange part, which is arranged on the side where the second auxiliary heat exchange part deviates from the first heat exchange part and / or the side where the second auxiliary heat exchange part deviates from the second heat exchange part and the windward side of the third heat exchange part.

[0036] In this technical solution, a second auxiliary heat exchange part is arranged on the windward side of the heat exchanger to increase the heat exchange area of the heat exchanger, thereby increasing the heat exchange efficiency of the heat exchanger; a second auxiliary heat exchange part is arranged on the windward side of the second auxiliary heat exchange part to further increase the heat exchange area of the heat exchanger, thereby increasing the heat exchange efficiency of the heat exchanger.

[0037] In the above embodiment, an air conditioner indoor unit adjusts the flow direction of the refrigerant in the first branch at the position with a higher wind speed of the heat exchanger. When the heat exchanger is an evaporator, the first branch near the lower end of the first heat exchange part flows from the leeward side of the first heat exchange part to the windward side of the first heat exchange part, so as to reduce the heat exchange efficiency of the first branch near the lower end of the first heat exchange part and avoid local overheating of the heat exchanger; and an auxiliary heat exchange part is arranged on the windward side of the heat exchanger to increase the heat exchange area of the heat exchanger, thereby increasing the heat exchange efficiency of the heat exchanger. Brief Description of the Drawings

[0038] Figure 1 is a schematic structural diagram of an embodiment of an air conditioner indoor unit in the present application;

[0039] Figure 2 is a schematic structural diagram of an embodiment of an air conditioner indoor unit in the present application without the air deflector assembled;

[0040] Figure 3 is a schematic structural diagram of an embodiment of an air conditioner indoor unit in the present application without the front panel assembled;

[0041] Figure 4 is a schematic structural diagram of an embodiment of an air conditioner indoor unit in the present application when the heat exchanger is installed in the housing;

[0042] Figure 5 is a schematic structural diagram of an embodiment of an air conditioner indoor unit in the present application of the heat exchanger;

[0043] Figure 6 is a curve graph showing the relationship between the heat exchange efficiency and the spacing of the main heat exchange tubes in the prior art;

[0044] Figure 7 is a schematic diagram of the flow path of the first flow path when the heat exchanger of an embodiment of an air conditioner indoor unit in the present application is an evaporator;

[0045] Figure 8 is a schematic diagram of the flow path of the first flow path when the heat exchanger of an embodiment of an air conditioner indoor unit in the present application is a condenser;

[0046] Figure 9 is a schematic diagram of the flow path of the second flow path when the heat exchanger of an embodiment of an air conditioner indoor unit in the present application is an evaporator;

[0047] Figure 10It is a schematic diagram of the flow path of the second flow path when the heat exchanger is a condenser in an embodiment of the indoor unit of the air conditioner in the present application;

[0048] Figure 11 It is a schematic diagram of the flow path of the third flow path when the heat exchanger is an evaporator in an embodiment of the indoor unit of the air conditioner in the present application;

[0049] Figure 12 It is a schematic diagram of the flow path of the third flow path when the heat exchanger is a condenser in an embodiment of the indoor unit of the air conditioner in the present application;

[0050] Figure 13 It is a schematic diagram of the flow path when the heat exchanger is an evaporator in an embodiment of the indoor unit of the air conditioner in the present application;

[0051] Figure 14 It is a schematic diagram of the flow path when the heat exchanger is a condenser in an embodiment of the indoor unit of the air conditioner in the present application;

[0052] Figure 15 It is a comparison curve graph of the air velocity at the first heat exchange part in an embodiment of the indoor unit of the air conditioner in the present application and the air velocity at the first heat exchange part in the prior art.

[0053] In the figure,

[0054] 10, housing; 200, air deflector; 300, fan; 400, heat exchanger;

[0055] 101, housing air inlet; 102, housing air outlet;

[0056] 110, outer cover; 120, base;

[0057] 410, first heat exchange part; 420, second heat exchange part; 430, third heat exchange part; 440, first auxiliary heat exchange part; 450, second auxiliary heat exchange part;

[0058] 401, first flow path; 402, second flow path; 403, third flow path;

[0059] 4011, first branch one; 4012, first branch two; 4013, first branch three; 4014, first branch four; 4015, first branch five; 4016, first branch six;

[0060] 4021, second branch one; 4022, second branch two; 4023, second branch three; 4024, second branch four;

[0061] 403a, third port; 403b, fourth port. Detailed implementation manner

[0062] To make the objectives and implementation manners of this application clearer, the following will clearly and completely describe the exemplary implementation manners of this application with reference to the accompanying drawings in the exemplary embodiments of this application. Apparently, the described exemplary embodiments are only a part rather than all of the embodiments of this application.

[0063] It should be noted that the brief description of the terms in this application is only for facilitating the understanding of the subsequent described implementation manners, rather than intending to limit the implementation manners of this application. Unless otherwise specified, these terms should be understood in their ordinary and common meanings.

[0064] In this application, terms such as "first" and "second" in the specification, claims and the above-mentioned drawings are used to distinguish similar or the same kind of objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that such terms can be interchanged under appropriate circumstances.

[0065] The terms "comprising" and "having" and any variations thereof are intended to cover but not be exclusive of inclusion. For example, a product or device comprising a series of components does not necessarily have to be limited to all the clearly listed components, but may include other components not clearly listed or inherent to these products or devices.

[0066] The air conditioner indoor unit provided by this application can have multiple implementation forms. Such as Figures 1 - 15 This is a specific implementation manner of the air conditioner indoor unit of this application.

[0067] Such as Figure 1 And Figure 2 As shown, the housing 10 is used to form the overall appearance of the air conditioner indoor unit. The housing 10 has a top and a bottom. The top of the housing 10 and the bottom of the housing 10 are opposite ends. The direction from the top of the housing 10 to the bottom of the housing 10 is the height direction of the housing 10; the left side of the housing 10 and the right side of the housing 10 are opposite sides. The direction from the left side of the housing 10 to the right side of the housing 10 is the length direction of the housing 10; the front side of the housing 10 and the rear side of the housing 10 are opposite sides. The direction from the front side of the housing 10 to the rear side of the housing 10 is the thickness direction of the housing 10.

[0068] In practical applications, the housing 10 is usually arranged at the indoor top or the upper space indoors. Among them, the rear side of the housing 10 faces the wall, and the front side of the housing 10 faces the user.

[0069] An air heat exchange channel is defined and formed inside the housing 10. Indoor air enters the air heat exchange channel for heat exchange to form air-conditioning air, so as to cool or heat the indoor environment.

[0070] The housing 10 includes an air inlet 101 of the housing. The air inlet 101 of the housing is communicated with the heat exchange channel, and indoor air enters the heat exchange channel from the air inlet 101 of the housing for heat exchange. The air inlet 101 of the housing is located at the top of the housing 10 and extends along the length direction of the housing 10.

[0071] The housing 10 includes an air outlet 102 of the housing. The air outlet 102 of the housing is communicated with the heat exchange channel, and the air in the heat exchange channel is output to the indoor through the air outlet 102 of the housing. The air outlet 102 of the housing is opened on the front side of the housing 10 and is arranged close to the bottom of the housing 10, that is, the air outlet 102 of the housing is located at the front lower side of the housing 10; the air outlet 102 of the housing extends along the length direction of the housing 10.

[0072] The air conditioner indoor unit includes a wind deflector 200. The wind deflector 200 is arranged at the air outlet 102 of the housing in a rotatable manner to open or close the air outlet 102 of the housing.

[0073] The housing 10 includes an outer cover 110, and the air outlet 102 of the housing is opened at the top of the outer cover 110.

[0074] The housing 10 includes a base 120. The base 120 is connected to the outer cover 110, and the base 120 and the outer cover 110 jointly define and form the heat exchange channel.

[0075] As Figure 2 shown, the air conditioner indoor unit includes a fan 300. The fan 300 is arranged in the heat exchange channel, and the fan 300 is installed on the base 120; the axial direction of the fan 300 extends along the length direction of the housing 10. By operating the fan 300, indoor air is introduced into the heat exchange channel from the air inlet 101 of the housing, and the air in the heat exchange channel flows to the indoor through the air outlet 102 of the housing. It should be noted that the fan 300 is a cross-flow fan.

[0076] As Figure 3 shown, the air conditioner indoor unit includes a heat exchanger 400. The heat exchanger 400 is arranged in the heat exchange channel. After the air in the heat exchange channel contacts the heat exchanger 400, it is heat-exchanged by the heat exchanger 400 to form air-conditioning air to meet the cooling or heating needs of users. It should be noted that the air-conditioning air can be cold air, hot air, or even normal-temperature air.

[0077] As Figure 4 shown, the heat exchanger 400 is installed on the base 120. The heat exchanger 400 is arranged close to the air inlet 101 of the housing, at least part of the windward side of the heat exchanger 400 faces the air inlet 101 of the housing, and the leeward side of the heat exchanger 400 faces the fan 300.

[0078] As Figure 4 and 5As shown, the heat exchanger 400 includes a first heat exchange portion 410 that extends along the length direction of the housing 10; the first heat exchange portion 410 is disposed near the front side of the housing 10, the upper end of the first heat exchange portion 410 is generally oriented towards the top of the housing 10, and the lower end of the first heat exchange portion 410 is generally oriented towards the bottom of the housing 10.

[0079] As Figure 4 and 5 shown, the heat exchanger 400 includes a second heat exchange portion 420 that extends along the length direction of the housing 10; the lower end of the second heat exchange portion 420 is connected to the upper end of the first heat exchange portion 410, and the upper end of the second heat exchange portion 420 is generally oriented towards the top of the housing 100 or the top and rear side of the housing 100.

[0080] As Figure 4 and 5 shown, the heat exchanger 400 includes a third heat exchange portion 430 that extends along the length direction of the housing 10 respectively; the third heat exchange portion 430 is disposed near the rear side of the housing 10, the upper end of the third heat exchange portion 430 is connected to the upper end of the second heat exchange portion 420, and the lower end of the third heat exchange portion 430 is generally oriented towards the bottom of the housing 10.

[0081] The first heat exchange portion 410, the second heat exchange portion 420, and the third heat exchange portion 430 are interconnected to form a semi-surrounding structure, so that the heat exchanger 400 covers the outer periphery of the blower 300.

[0082] The heat exchanger 400 includes main heat exchange tubes that are respectively disposed in the first heat exchange portion 410, the second heat exchange portion 420, and the third heat exchange portion 430, and the refrigerant flows in the main heat exchange tubes to enable the heat exchanger 400 to exchange heat with the indoor air.

[0083] The spacing L between adjacent main heat exchange tubes satisfies: L≥10mm, L≤20mm.

[0084] If L>20mm, the arrangement of the main heat exchange tubes is relatively sparse, the number of heat exchange tubes per unit area decreases, thereby reducing the heat exchange area of the first heat exchange portion 410, further reducing the heat exchange performance of the heat exchanger 400, and may also cause local overheating or overcooling phenomena, damaging the heat exchanger 400.

[0085] If L<10mm, the arrangement of the main heat exchange tubes is relatively dense, increasing the flow resistance of the refrigerant in the main heat exchange tubes, which may affect the distribution uniformity of the refrigerant, thereby reducing the heat exchange performance of the heat exchanger 400, and may also cause local stress concentration in the main heat exchange tubes, and there is a risk of cracking and leakage in the main heat exchange tubes.

[0086] As Figure 6As shown, in some embodiments, there is a relationship between the spacing L between the main heat exchange tubes and the heat exchange efficiency, which first increases and then decreases.

[0087] In this embodiment, the spacing L between adjacent main heat exchange tubes is 14.5 mm, so that the heat exchanger 400 has a high heat exchange efficiency.

[0088] When the diameter of the main heat exchange tube is relatively large, the flow resistance of the refrigerant in the pipe can be reduced, and the heat exchange effect can be improved. However, a large diameter will also reduce the surface area of the pipe, thereby reducing the heat transfer area per unit volume, which will to a certain extent reduce the heat exchange effect. When the diameter is relatively small, the flow velocity of the refrigerant in the pipe will increase, resulting in more intense movement of the refrigerant in the pipe, which can enhance the turbulent state of the refrigerant, but it will also increase the frictional resistance of the refrigerant and reduce the heat transfer efficiency, resulting in a more uneven distribution of the refrigerant in the pipe. Especially at high flow velocities, refrigerant retention or vortex phenomena may occur in some areas, affecting the heat transfer effect. The selection of the main heat exchange tube specifications needs to balance the effects of these two aspects. In this embodiment, the diameter of the main heat exchange tube is Φ5.

[0089] For the convenience of description, the main heat exchange tubes provided in the first heat exchange part 410 are called the first heat exchange tubes, the main heat exchange tubes provided at the lower end of the second heat exchange part 420 are called the second heat exchange tubes, and the main heat exchange tubes provided at the upper end of the second heat exchange part 420 are called the third heat exchange tubes; the main heat exchange tubes provided in the third heat exchange part 430 are called the fourth heat exchange tubes.

[0090] The first heat exchange tube and the second heat exchange tube jointly define and form a first flow path 401; the third heat exchange tube and the fourth heat exchange tube jointly define and form a second flow path 402, and the second flow path 402 and the first flow path 401 are in communication with each other.

[0091] When the heat exchanger 400 is an evaporator, the refrigerant flows through the second flow path 402 and the first flow path 401 in sequence; when the heat exchanger 400 is a condenser, the refrigerant flows through the first flow path 401 and the second flow path 402 in sequence.

[0092] In some embodiments of the present application, as Figure 7 and Figure 8 shown, the first flow path 401 includes a plurality of first branches, and the plurality of first branches are arranged in parallel. The plurality of first branches are arranged in a first direction, and the first direction is along the windward surface of the heat exchanger 400 from the lower end of the first heat exchange part 410 to the upper end of the second heat exchange part 420.

[0093] The first branch includes a first port. When the heat exchanger 400 is an evaporator, the first port is the inlet; when the heat exchanger 400 is a condenser, the first port is the outlet.

[0094] The first branch includes a second port. When the heat exchanger 400 is an evaporator, the second port is the outlet; when the heat exchanger 400 is a condenser, the second port is the inlet.

[0095] When the heat exchanger 400 is an evaporator, the refrigerant in the first branch flows from the first port to the second port; when the heat exchanger 400 is a condenser, the refrigerant in the first branch flows from the second port to the first port.

[0096] Since the wind speed is relatively high at the position near the lower end of the first heat exchange part 410, when the heat exchanger 400 is an evaporator, the refrigerant evaporates relatively fast, and overheating has occurred in the latter half of the tube pass. The temperature change of the refrigerant at this place is too large, resulting in a deterioration of the synergy with the air-side temperature field, that is, the temperature difference becomes smaller and the heat transfer performance decays. Due to the overheating in the latter half, the amount of gaseous refrigerant increases, not only deteriorating the heat transfer performance, but also accelerating the increase in pressure drop, which also leads to an increase in the overall power consumption of the machine.

[0097] Based on this, in the present application, by arranging the first branch at the position with a relatively high wind speed to flow from the leeward side of the first heat exchange part 410 to the windward side of the first heat exchange part 410, the wind speed at the inlet of the first branch is reduced, thereby reducing the overheating situation, enabling the air flowing through this place to fully analyze moisture, and avoiding the situation of water blowing in the heat exchange channel due to moisture analysis along the heat exchange channel.

[0098] Specifically, a plurality of first branches are arranged along the first direction and are sequentially numbered as the first branch one 4011, the first branch two 4012... The first branch one 4011 is arranged near the lower end of the first heat exchange part 410.

[0099] The first port 4011a of the first branch one 4011 is arranged near the leeward side of the first heat exchange part, and the second port 4011b of the first branch one 4011 is arranged near the windward side of the first heat exchange part; the first ports 4012a of the other first branches are arranged near the windward side of the first heat exchange part, and the second ports 4012b of the other first branches are arranged near the leeward side of the first heat exchange part.

[0100] By arranging the first port of the first branch 4011 close to the leeward side of the first heat exchange part 410 and the second port of the first branch 4011 close to the windward side of the first heat exchange part 410, the wind speed at the inlet of the first branch 4011 can be reduced, so that the boiling and vaporization speed of the refrigerant flowing along the way becomes slower, thereby extending the two-phase region. The extension of the two-phase region can strengthen the coordination between the air-side temperature field and the refrigerant side inside the pipe, that is, it can keep the temperature difference between the inside and outside of the pipe at a relatively large level and increase the heat transfer amount in this heat exchange area. In addition, due to the extension of the two-phase region, the refrigerant in the first branch 4011 can be kept at a relatively low temperature, and the air flowing outside the pipe through this region can be fully dehumidified. It avoids the risk of condensate being blown out after the air that has not been fully dehumidified flows out and mixes with the low-temperature air flowing out of the other heat exchange parts.

[0101] In some embodiments of the present application, as Figure 9 and Figure 10 shown, the second flow path 402 includes a plurality of second branches, and the plurality of second branches are arranged in parallel with each other. The plurality of second branches are arranged along the second direction, and the second direction is along the windward surface of the heat exchanger 400 from the upper end of the second heat exchange part 420 towards the lower end of the third heat exchange part 430.

[0102] As Figure 9 shown, when the heat exchanger 400 is an evaporator, the second branch flows from the windward side of the heat exchanger 400 to the leeward side of the heat exchanger 400; as Figure 10 shown, when the heat exchanger 400 is a condenser, the second branch flows from the leeward side of the heat exchanger 400 to the windward side of the heat exchanger 400.

[0103] Specifically, the second branch includes a fifth port 402a, and the fifth port 402a is arranged close to the windward side of the first heat exchange part 410; when the heat exchanger 400 is an evaporator, the fifth port 402a is the inlet; when the heat exchanger 400 is a condenser, the fifth port 402a is the outlet.

[0104] The second branch includes a sixth port 402b, and the sixth port 402b is arranged close to the leeward side of the first heat exchange part 410; when the heat exchanger 400 is an evaporator, the sixth port 402b is the outlet; when the heat exchanger 400 is a condenser, the sixth port 402b is the inlet.

[0105] It should be noted that in some embodiments, each branch of the second flow path adopts the design of the same tube pass and the same area, and no jump tube treatment is performed with a crossover elbow, so as to ensure that the flow velocity and heat transfer efficiency of the second branch are approximately the same and avoid wasting the heat exchange area in this region.

[0106] In some embodiments of the present application, as Figure 5As shown, the heat exchanger 400 includes a first auxiliary heat exchange part 440 for increasing the heat exchange area of the heat exchanger 400. The first auxiliary heat exchange part 440 is arranged on the windward side of the heat exchanger 400 and is distributed along the windward side of the heat exchanger 400 from the lower end of the first heat exchange part 410 towards the lower end of the third heat exchange part 430.

[0107] As Figure 11 and Figure 12 shown, the first auxiliary heat exchange part 440 includes first auxiliary heat exchange tubes which define a third flow path 403 that communicates with the second flow path 402 and the first flow path 401.

[0108] The third flow path 403 includes a third port 403a which is an inlet when the heat exchanger 400 is an evaporator and an outlet when the heat exchanger 400 is a condenser.

[0109] The third flow path 403 includes a fourth port 403b which is an outlet when the heat exchanger 400 is an evaporator and an inlet when the heat exchanger 400 is a condenser.

[0110] As Figure 13 shown, when the heat exchanger 400 is an evaporator, the refrigerant flows through the third flow path 403, the second flow path 402 and the first flow path 401 in sequence.

[0111] As Figure 14 shown, when the heat exchanger 400 is a condenser, the refrigerant flows through the first flow path 401, the second flow path 402 and the third flow path 403 in sequence.

[0112] In this application, the third port 403a and the fourth port 403b of the third flow path 403 are arranged at positions with a relatively low wind speed on the windward side of the heat exchanger 400.

[0113] Specifically, the third port 403a is arranged at a position of the first auxiliary heat exchange part 440 close to the lower end of the third heat exchange part 430, and the fourth port 403b is arranged at a position of the first auxiliary heat exchange part 440 close to the lower end of the first heat exchange part 410.

[0114] As Figure 11 shown, when the heat exchanger 400 is an evaporator, the refrigerant flows in the third flow path 403 from the lower end of the first heat exchange part 410 towards the lower end of the third heat exchange part 430.

[0115] As Figure 12 shown, when the heat exchanger 400 is a condenser, the refrigerant flows in the third flow path 403 from the lower end of the third heat exchange part 430 towards the lower end of the first heat exchange part 410.

[0116] When the heat exchanger 400 is an evaporator, the flow rate of the refrigerant is relatively low. When the refrigerant just flows into the heat exchanger 400, the proportion of the gas phase component is relatively low, and the pressure loss of the refrigerant is relatively small. Arranging the third port 403a and the fourth port 403b at a position with a relatively low wind speed on the windward side of the heat exchanger 400 can reduce the excessive increase of the gas phase component, thereby increasing the acceleration pressure drop.

[0117] When the heat exchanger 400 is a condenser, the third flow path 403 is already in the second half of the process. At this time, the refrigerant has completely or nearly completely condensed into a liquid state. In order to allow the liquid refrigerant flowing out of the heat exchanger 400 to be sufficiently subcooled so as not to flash out gaseous refrigerant after flowing out and reduce the system capacity, an undercooling section is usually required. Arranging the fourth port 403b at a position near the lower end of the first heat exchange section 410 of the first auxiliary heat exchange section 440 can allow the refrigerant to fully convert gravitational potential energy into pressure potential energy and reduce the pressure drop.

[0118] The pipe diameter size of the first auxiliary heat exchange tube is greater than or equal to the pipe diameter size of the main heat exchange tube. When the heat exchanger 400 is a condenser, the first auxiliary heat exchange tube is an undercooling section, and the large pipe diameter design can increase the undercooling degree.

[0119] It should be noted that the installation position of the first auxiliary heat exchange section 440 and the number of the first auxiliary heat exchange tubes are not fixed and can be adjusted according to specific design requirements and the wind speed distribution of the heat exchanger 400.

[0120] For the pipe diameter selection of the first auxiliary heat exchange tube, it is necessary to increase the heat exchange area in this area under the condition of ensuring that the pressure drop is not too large for the intermediate refrigeration condition and the intermediate heating condition as much as possible. It should be noted that when the heat exchanger 400 is an evaporator, the indoor unit of the air conditioner is in the refrigeration condition, and when the heat exchanger 400 is a condenser, the indoor unit of the air conditioner is in the heating condition.

[0121] The pressure drop loss inside the pipe follows the Darcy formula: △P = λL / d(ρv^2) / 2. In the case of the same pipe pass, the pressure drop of the first auxiliary heat exchange tube can be approximately regarded as being proportional to the square of the velocity and inversely proportional to the inner diameter of the flow path. And the flow velocity is inversely proportional to the flow diameter. Furthermore, it can be obtained that the pressure drop is approximately inversely proportional to the fifth power of the inner diameter of the flow path. That is, △P1 / △P2≈di2^5 / di1^5. Combining the currently commonly used optional copper pipe specifications and the relationship of the pressure drop, the relationship formula of the flow inner diameters between the first auxiliary heat exchange tube and the main heat exchange tube can be obtained.

[0122] In this application, the relationship between the pipe diameter d1 of the first auxiliary heat exchange tube and the pipe diameter d2 of the main heat exchange tube satisfies the relationship formula: d1 / d2 > 1, d1 / d2 ≤ 2.06.

[0123] In this embodiment, the pipe diameter of the first auxiliary heat exchange tube is Φ7, that is, the ratio of the inner diameters of the flow paths is 1.42.

[0124] It should be noted that the diameter of the first auxiliary heat exchange tube is Φ7, which can increase the contact area between the refrigerant and the heat exchange tube, effectively increase the subcooling degree under the intermediate heating condition, so as to achieve the purpose of enhancing heat exchange. And using a Φ7 diameter can also ensure that in other evaporation conditions, there will be no situations such as reduced capacity and energy efficiency, freezing or water blowing of the heat exchanger 400 caused by excessive refrigerant pressure loss.

[0125] In some embodiments of the present application, the heat exchanger 400 includes a second auxiliary heat exchange part 450, and the second auxiliary heat exchange part 450 is used to increase the heat exchange area of the heat exchanger 400; the second auxiliary heat exchange part 450 is respectively arranged on the windward side of the first heat exchange part 410 and the windward side of the second heat exchange part 420.

[0126] The second auxiliary heat exchange part 450 includes second auxiliary heat exchange tubes, as Figures 7 - 10 shown, the second auxiliary heat exchange tubes located on the windward side of the first heat exchange part 410 and the second auxiliary heat exchange tubes located on the windward side at the lower end of the second heat exchange part 420 jointly define a first flow path 401 with the first heat exchange tube and the second heat exchange tube; the second auxiliary heat exchange tubes located on the windward side at the upper end of the second heat exchange part 420 jointly define a second flow path 402 with the third heat exchange tube and the fourth heat exchange tube.

[0127] In this embodiment, the diameter size of the second auxiliary heat exchange tube is the same as that of the main heat exchange tube, and the diameter of the second auxiliary heat exchange tube is Φ5. If the diameter size of the second auxiliary heat exchange tube is Φ7, it is easy to increase the overall wind resistance of the heat exchanger 400.

[0128] The above indoor air conditioner will be introduced in detail with specific examples below.

[0129] The first flow path adopts a six-way parallel type, that is, the first branch is set to six, and the six first branches are sequentially numbered as the first branch one 4011, the first branch two 4012, the first branch three 4013, the first branch four 4014, the first branch five 4015 and the first branch six 4016 along their arrangement direction. Among them, the first branch one 4011, the first branch two 4012 and the first branch three 4013 are the first heat exchange tubes, and the first branch four 4014, the first branch five 4015 and the first branch six 4016 are the second heat exchange tubes. The first port 4011a of the first branch one 4011 is arranged close to the leeward side of the first heat exchange part 410, and the second port 4011b of the first branch one 4011 is arranged close to the windward side of the first heat exchange part 410; the first ports 4012a of the remaining first branches are arranged close to the windward side of the first heat exchange part 410, and the second ports 4012b of the remaining first branches are arranged close to the leeward side of the first heat exchange part 410.

[0130] The second flow path is of a four-way parallel type, that is, the second branch is provided with four branches, and the four second branches are sequentially numbered as the first second branch 4021, the second second branch 4022, the third second branch 4023, and the fourth second branch 4024 along their arrangement direction. The fifth port 402a is arranged near the windward side of the first heat exchange part 410, and the sixth port 402b is arranged near the leeward side of the first heat exchange part 410.

[0131] The third flow path 403 adopts a one-way in-and-out type. The third port 403a is arranged at a position where the first auxiliary heat exchange part 440 is close to the lower end of the third heat exchange part 430; the fourth port 403b is arranged at a position where the first auxiliary heat exchange part 440 is close to the lower end of the first heat exchange part 410.

[0132] When the heat exchanger 400 is an evaporator, the refrigerant first flows along the third flow path 403 and then flows into the second flow path 402. The refrigerant is split into four paths in the second flow path 402 and then flows into the first flow path 401. The refrigerant is split into six paths in the first flow path 401.

[0133] After the refrigerant flows out through the second flow path 402, the gas-phase component of the refrigerant in the pipeline already accounts for more than half. At this time, the acceleration pressure drop of the refrigerant in the pipe will be aggravated. The design of the 4-way split can no longer meet the design requirements of high efficiency and low resistance. Therefore, it is necessary to perform secondary splitting on the first flow path 401. After splitting, the first flow path 401 is of a six-way parallel type. At this time, the refrigerant flowing into the first branch has a higher dryness, the refrigerant in the pipe is more sensitive to the external wind speed distribution, and the acceleration pressure drop in the pipe is also higher. It is also necessary to control the pressure drop through wind speed adjustment.

[0134] It should be noted that in some embodiments, the outlet temperature difference of the six first branches does not exceed 3°C.

[0135] When the heat exchanger 400 is a condenser, the refrigerant first flows along the first flow path 401. The refrigerant is split into six paths in the first flow path 401 and then flows into the second flow path 402. The refrigerant is split into four paths in the second flow path 402 and then flows into the third flow path 403.

[0136] In some embodiments, the parameter defining the non-uniformity degree of the wind speed distribution In the formula: N is the number of samples; Vi is the wind speed at each sampling point, is the average incoming flow wind speed. As Figure 15 shown, the orange line is the wind speed obtained by the technical solution in this application, and the blue line is the wind speed obtained by the prior art. The wind speed distribution in this application is more uniform than that in the prior art.

[0137] The above air conditioner indoor unit adjusts the flow direction of the refrigerant in the first branch at the position with a relatively high heat exchanger air velocity. When the heat exchanger is an evaporator, the first branch near the lower end of the first heat exchange part flows from the leeward side of the first heat exchange part to the windward side of the first heat exchange part, so as to reduce the heat exchange efficiency of the first branch near the lower end of the first heat exchange part, avoid local overheating of the heat exchanger, reduce the overheating phenomenon of the flow path at this place caused by too high air velocity, and make the heat exchange area at this place be fully utilized; when the humid air flows through this heat exchange part, it can be fully dehumidified, avoiding the situation of mixed water blowing inside the air duct. By arranging an auxiliary heat exchange part on the windward side of the heat exchanger, the heat exchange area of the heat exchanger is increased, thereby increasing the heat exchange efficiency of the heat exchanger.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0139] For the sake of convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. According to the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are for better explaining the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. An air conditioner indoor unit, characterized in that: include: A casing, comprising a casing air inlet and a casing air outlet, wherein the casing air inlet is opened at the top of the casing, and the casing air outlet is opened at the front bottom of the casing; a fan, which is arranged inside the casing and is used to introduce air into the casing through the casing air inlet, and to output the air inside the casing to the outside of the casing through the casing air outlet; A heat exchanger for exchanging heat with air passing therethrough; The windward side of at least part of the heat exchanger is arranged toward the air inlet of the casing; The leeward side of the heat exchanger is arranged toward the fan; The heat exchanger further comprises: A first heat exchange portion, which is disposed near the front side of the housing; a second heat exchange part, wherein the lower end of the second heat exchange part is connected to the upper end of the first heat exchange part; and the upper end of the second heat exchange part is arranged toward the top of the casing and the rear side of the casing; a third heat exchange portion, which is disposed near the rear side of the housing; an upper end of the third heat exchange portion is connected to an upper end of the second heat exchange portion, and a lower end of the third heat exchange portion is disposed toward the bottom of the housing; Main heat exchange pipes, which are respectively arranged in the first heat exchange part, the second heat exchange part and the third heat exchange part, the main heat exchange pipes located in the first heat exchange part and the lower part of the second heat exchange part jointly define a first flow path; the main heat exchange pipes located in the upper part of the second heat exchange part and the third heat exchange part jointly define a second flow path, and the second flow path and the first flow path are connected to each other; Wherein, the first flow path includes multiple first branches, and the multiple first branches are arranged in parallel; when the heat exchanger is an evaporator, the refrigerant in the first branch close to the lower end of the first heat exchange part flows from the leeward side of the first heat exchange part to the windward side of the first heat exchange part.

2. The air conditioner indoor unit according to claim 1, characterized in that: A plurality of first branches are arranged along a first direction, and the first direction is along the windward surface of the heat exchanger from the lower end of the first heat exchange part toward the upper end of the second heat exchange part; the first branch includes a first port and a second port, and the refrigerant flows from the first port to the second port, or the refrigerant flows from the second port to the first port; the first port of the first branch near the lower end of the first heat exchange part is arranged near the leeward side of the first heat exchange part, and the second port of the first branch near the lower end of the first heat exchange part is arranged near the windward side of the first heat exchange part.

3. The air conditioner indoor unit according to claim 1, characterized in that: The second flow path includes multiple second branches, and the multiple second branches are arranged in parallel with each other; when the heat exchanger is an evaporator, the second branch flows from the windward side of the heat exchanger to the leeward side of the heat exchanger; when the heat exchanger is a condenser, the second branch flows from the leeward side of the heat exchanger to the windward side of the heat exchanger.

4. The air conditioner indoor unit according to claim 1, characterized in that: The heat exchanger includes a first auxiliary heat exchange portion, which is arranged on the windward side of the heat exchanger and is used to increase the heat exchange area of ​​the heat exchanger.

5. The air conditioner indoor unit according to claim 4, characterized in that: The first auxiliary heat exchange portion includes a first auxiliary heat exchange tube, the first auxiliary heat exchange tube defines a third flow path, and the third flow path is interconnected with the second flow path and the first flow path.

6. The air conditioner indoor unit according to claim 5, characterized in that: The third flow path includes a third port and a fourth port. The third port is provided at a position of the first auxiliary heat exchange part close to the lower end of the third heat exchange part. The fourth port is provided at a position of the first auxiliary heat exchange part close to the lower end of the first heat exchange part.

7. The air conditioner indoor unit according to claim 5, characterized in that: The diameter of the first auxiliary heat exchange tube is greater than or equal to the diameter of the main heat exchange tube.

8. The air conditioner indoor unit according to claim 1, characterized in that: The heat exchanger includes a second auxiliary heat exchange portion, which is arranged on the windward side of the first heat exchange portion and the windward side of the second heat exchange portion, and is used to increase the heat exchange area of ​​the heat exchanger.

9. The air conditioner indoor unit according to claim 8, characterized in that: The second auxiliary heat exchange part includes a second auxiliary heat exchange tube, and the second auxiliary heat exchange tube located on the windward side of the first heat exchange part and a part of the second auxiliary heat exchange tube located on the windward side of the second heat exchange part are used to form the first flow path; the second auxiliary heat exchange tube located on the other part of the windward side of the second heat exchange part is used to form the second flow path.

10. An air conditioner indoor unit, characterized in that: include: A casing, comprising a casing air inlet and a casing air outlet, wherein the casing air inlet is opened at the top of the casing, and the casing air outlet is opened at the front bottom of the casing; a fan, which is arranged inside the casing and is used to introduce air into the casing through the casing air inlet, and to output the air inside the casing to the outside of the casing through the casing air outlet; A heat exchanger is arranged inside the casing and is used to exchange heat with the air passing through it; the heat exchanger is arranged along the length direction of the casing; at least part of the heat exchanger is arranged close to the air inlet of the casing; The leeward side of the heat exchanger is arranged toward the fan; The heat exchanger further comprises: a first heat exchange portion, which is disposed near the front side of the housing; a lower end of the first heat exchange portion is disposed near the bottom of the housing; a second heat exchange portion connected to the upper end of the first heat exchange portion; the upper end of the second heat exchange portion is disposed close to the top of the housing and the rear side of the housing; A third heat exchange part, which is connected to the upper end of the second heat exchange part, and the lower end of the third heat exchange part is arranged toward the rear side of the casing and the bottom of the casing; a second auxiliary heat exchange portion, which is disposed on the windward side of the first heat exchange portion and the second heat exchange portion; The first auxiliary heat exchange part is arranged on a side of the second auxiliary heat exchange part away from the first heat exchange part and / or a side of the second auxiliary heat exchange part away from the second heat exchange part and a windward side of the third heat exchange part.

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