Air conditioner indoor unit

Abstract

The present invention provides an air conditioner indoor unit, comprising a shell having an air inlet area and upper and lower air outlets distributed up and down, and two single-suction backward centrifugal fans arranged in an internal storage space of the shell, wherein one single-suction backward centrifugal fan is configured to cause part of the air flow to flow from the air inlet area to the upper part of the storage space, so that the part of the air flow is blown out from the upper air outlet, and the other single-suction backward centrifugal fan is configured to cause part of the air flow to flow from the air inlet area to the lower part of the storage space, so that the part of the air flow is blown out from the lower air outlet. The present invention adopts two air outlets and two relatively small single-suction backward centrifugal fans, which can improve the aesthetics of the indoor unit and reduce the overall volume and thickness of the air conditioner indoor unit. In addition, the operation of different single-suction backward centrifugal fans can be controlled according to different operation modes of the air conditioner indoor unit, thereby improving the cooling and heating experience.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an indoor unit of an air conditioner. Background Art

[0002] The existing wall-mounted air conditioner indoor unit generally uses a cross-flow fan and a bent heat exchanger to supply air to an air outlet. The air supply range is limited, the air supply mode is fixed and inflexible, and it is difficult to meet the comfort and diversity needs of users. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide an air conditioner indoor unit that overcomes the above problems or at least partially solves the above problems.

[0004] A further object of the present invention is to improve the air supply effect and air supply efficiency of the indoor unit.

[0005] The present invention provides an air conditioner indoor unit, comprising:

[0006] The shell is formed with an air inlet area, an upper air outlet is formed at the upper front side of the shell, and a lower air outlet is formed at the lower front side of the shell;

[0007] Two single-suction backward centrifugal fans are arranged in the accommodation space inside the shell, one of which is configured to force part of the air flow to flow from the air inlet area to the upper part of the accommodation space so that the part of the air flow is blown out from the upper air outlet, and the other single-suction backward centrifugal fan is configured to force part of the air flow to flow from the air inlet area to the lower part of the accommodation space so that the part of the air flow is blown out from the lower air outlet.

[0008] Optionally, each single-suction backward centrifugal fan comprises:

[0009] The volute has a transversely extending accommodating cavity, the accommodating cavity has a fan air inlet, and the volute also has a fan air outlet communicated with the accommodating cavity;

[0010] An impeller is disposed in the accommodating cavity and is rotatable relative to the volute about a transverse axis;

[0011] The impeller blades are installed with an outlet angle of 30° to 40°.

[0012] Optionally, the specific speed of each single-suction backward centrifugal fan is 58 to 60.

[0013] Optionally, the circumferential speed of each single-suction backward centrifugal fan is 11 to 12 m / s.

[0014] Optionally, the total pressure coefficient of each single-suction backward centrifugal fan is 0.7 to 0.9.

[0015] Optionally, the upper air outlet and the lower air outlet are recorded as two air outlets of an indoor unit of the air conditioner;

[0016] The single-suction backward centrifugal fan that forces part of the airflow to flow toward the upper portion of the accommodation space has an upward fan outlet, and the single-suction backward centrifugal fan that forces part of the airflow to flow toward the lower portion of the accommodation space has a downward fan outlet;

[0017] The air conditioner indoor unit also includes two air guide covers corresponding to the two single-suction rear-facing centrifugal fans. Each of the air guide covers has an air collecting chamber connected to the fan outlet of the corresponding single-suction rear-facing centrifugal fan and an air guide duct running through the air collecting chamber. A air guide outlet opposite to the corresponding air outlet is formed on the front side of the air guide duct.

[0018] Optionally, the air conditioner indoor unit further includes:

[0019] Two air outlet pipes extending front and back and distributed up and down in the accommodation space, the air outlet pipe located at the top corresponds to the air guide cover located at the top, and the air outlet pipe located at the bottom corresponds to the air guide cover located at the bottom;

[0020] Each air outlet pipe comprises an outer pipe extending forward and backward and a first inner pipe connected to the inner peripheral wall of the outer pipe and extending from the back to the front in a gradually expanding manner to protrude from the front side of the outer pipe. The air inlet end of the outer pipe passes through the guide air outlet of the corresponding air guide cover and is located in the corresponding guide air duct, so that the heat exchange airflow enters the corresponding air outlet pipe;

[0021] The air inlet end of the first inner tube is located inside the outer tube near the front end of the outer tube, the air outlet end of the first inner tube protrudes from the front side of the corresponding air outlet, and a first spacing space is formed between the inner peripheral wall of the outer tube and the outer peripheral wall of the first inner tube to allow heat exchange airflow to pass through.

[0022] Optionally, each air outlet pipe also includes a second inner tube, which extends gradually from back to front in the corresponding first inner tube, and a second spacing space is formed between the outer peripheral wall of the second inner tube and the inner peripheral wall of the corresponding first inner tube to facilitate the passage of heat exchange airflow.

[0023] Optionally, each air outlet pipe is configured to be controllably movable in the front-to-rear direction between a position protruding from the front side of the corresponding air outlet and a position retracted to the corresponding air outlet;

[0024] When the air outlet pipe retracts to the position in the corresponding air outlet, the outer peripheral wall of the air outlet end of the first inner pipe abuts against the inner peripheral wall of the corresponding air outlet to close the first partition space, so that the heat exchange airflow is blown out to the front side from the second partition space and the second inner pipe respectively;

[0025] When the air outlet pipe is located at a position protruding from the front side of the corresponding air outlet, the air outlet end of the first inner pipe protrudes from the front side of the corresponding air outlet to expose the first partition space, so that the heat exchange airflow is blown toward the front side from the first partition space, the second partition space and the second inner pipe respectively.

[0026] Optionally, the inner peripheral wall of the outer tube includes a rear wall section and a front wall section which are sequentially connected in a direction from the air inlet end to the air outlet end of the outer tube, and the air inlet end of the first inner tube is located in a space formed by the front wall section to form a first spacing space between the front wall section and the outer peripheral wall of the first inner tube;

[0027] The rear wall section is a hollow truncated cone that gradually expands forward from the air inlet end of the outer tube, and the front wall section is a hollow truncated cone that gradually expands from the position connected to the rear wall section to the air outlet end of the outer tube; and

[0028] The taper angle of the rear wall section is greater than the taper angle of the front wall section.

[0029] The air-conditioning indoor unit of the present invention has two air outlets distributed in the upper and lower parts, and the upper air outlet and the lower air outlet set off each other, avoiding the visual abruptness brought by one air outlet, making the overall appearance of the indoor unit more harmonious and beautiful, and meeting the user's higher aesthetic needs; and, the air-conditioning indoor unit has a single-suction rear-facing centrifugal fan. Compared with the traditional air-conditioning indoor unit with one air supply fan, two relatively small single-suction rear-facing centrifugal fans are used, which is convenient for more reasonable allocation of the internal accommodation space of the indoor unit and reducing the overall volume and thickness of the air-conditioning indoor unit; furthermore, the two single-suction rear-facing centrifugal fans can be independently controlled to operate, which is convenient for controlling the opening of different single-suction rear-facing centrifugal fans according to different operating modes of the air-conditioning indoor unit, thereby improving the cooling and heating experience.

[0030] Furthermore, in the air-conditioning indoor unit of the present invention, multiple parameters of each single-suction backward centrifugal fan are designed to meet specific values, so that the size and air supply efficiency of the two single-suction backward centrifugal fans reach an optimal balance, thereby maximizing the reduction of the overall size of the indoor unit and meeting the user's demand for a miniaturized appearance of the indoor unit.

[0031] Furthermore, in the air-conditioning indoor unit of the present invention, air outlet ducts are respectively arranged at the two air outlets, and the air outlet ducts with specially designed structures are used to expand the air outlet range of the indoor unit, thereby improving the air supply uniformity and air supply comfort.

[0032] Furthermore, in the air-conditioning indoor unit of the present invention, the two air outlet ducts can be moved forward and backward under control, and the air outlet range, air outlet distance, air outlet uniformity and air supply efficiency of the two air outlet ducts of the indoor unit can be adjusted respectively according to different operating modes of the indoor unit, thereby further enhancing the air supply effect of the indoor unit and improving the user's comfort experience.

[0033] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0035] Figure 1 is a schematic diagram of the appearance structure of an air conditioner indoor unit according to an embodiment of the present invention;

[0036] Figure 2 is a schematic diagram of the internal structure of an indoor unit of an air conditioner according to an embodiment of the present invention, wherein the front panel is hidden to show the internal structure of the indoor unit;

[0037] Figure 3 is a schematic diagram of the appearance structure of an air-conditioning indoor unit according to another embodiment of the present invention;

[0038] Figure 4 is a schematic diagram of the internal structure of an air conditioner indoor unit according to another embodiment of the present invention, wherein the front panel is hidden to show the internal structure of the indoor unit;

[0039] Figure 5 is an exploded schematic diagram of an air conditioner indoor unit according to an embodiment of the present invention;

[0040] Figure 6 is a schematic structural diagram of an air guide cover of an air conditioner indoor unit according to an embodiment of the present invention;

[0041] Figure 7 is a schematic structural diagram of an air outlet duct of an indoor unit of an air conditioner according to one embodiment of the present invention in one direction; and

[0042] Figure 8 4 is a cross-sectional schematic diagram of an air outlet duct of an indoor unit of an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] Refer to the following Figures 1 to 8 The air conditioner indoor unit 10 of the embodiment of the present invention is described. The directions or positional relationships indicated by "front", "rear", "upper", "lower", "inner", "outer", "lateral", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention.

[0044] Figure 1 is a schematic structural diagram of an air-conditioning indoor unit 10 according to an embodiment of the present invention. Figure 2 1 is a schematic diagram of the internal structure of an air-conditioning indoor unit 10 according to an embodiment of the present invention, wherein the front panel 12 is hidden to illustrate the internal structure of the indoor unit 10.

[0045] The air-conditioning indoor unit of the present embodiment is a wall-mounted air-conditioning indoor unit 10, which includes a shell and two single-suction backward centrifugal fans 14 arranged in a storage space inside the shell. The shell is formed with an air inlet area 11a and two air outlets, one air outlet is formed at the upper front side of the shell, denoted as the upper air outlet 12a, and the other air outlet is formed at the lower front side of the shell, denoted as the lower air outlet 12b. One of the two single-suction backward centrifugal fans 14 is configured to cause part of the airflow to flow from the air inlet area 11a to the upper part of the storage space, so that the part of the airflow is blown out from the upper air outlet 12a, and the other single-suction backward centrifugal fan 14 is configured to cause part of the airflow to flow from the air inlet area 11a to the lower part of the storage space, so that the part of the airflow is blown out from the lower air outlet 12b. Among them, the front-to-back direction is as follows: Figure 1 The direction indicated.

[0046] In some embodiments, the projection of the shell in a plane parallel to the rotation axis of the single-suction rear-facing centrifugal fan 14 is a square, and the projections of the upper air outlet 12a and the lower air outlet 12b in a plane parallel to the rotation axis of the single-suction rear-facing centrifugal fan 14 can both be square or circular.

[0047] In some embodiments, the projection of the shell in a plane parallel to the rotation axis of the single-suction rear-facing centrifugal fan 14 is circular, and the projections of the upper air outlet 12a and the lower air outlet 12b in a plane parallel to the rotation axis of the single-suction rear-facing centrifugal fan 14 are both circular, making the entire air-conditioning indoor unit 10 unique and beautiful in appearance, completely different from the existing long wall-mounted air-conditioning indoor unit 10, meeting the user's personalized aesthetic needs.

[0048] In the existing scheme, the air conditioner indoor unit 10 with similar appearance has an air outlet and an air supply fan. In order to meet the air supply demand of the air conditioner indoor unit 10, the air supply fan has a large power and a large volume, resulting in a large overall thickness of the air conditioner indoor unit 10 (the size of the air conditioner indoor unit 10 in the front and rear directions), and an air outlet is opened on the flat surface of the front side of the indoor unit 10, which affects the overall aesthetics of the indoor unit 10. In this embodiment, the air supply of the air conditioner indoor unit 10 is achieved by adopting two single-suction backward centrifugal fans 14. The sizes of the two single-suction backward centrifugal fans 14 are relatively small, which can greatly reduce the overall volume and thickness of the air conditioner indoor unit 10; and, by forming an upper air outlet 12a at the upper part of the front side of the shell and a lower air outlet 12b at the lower part of the front side of the shell, the upper air outlet 12a and the lower air outlet 12b complement each other, avoiding the visual abruptness brought by one air outlet, making the overall appearance of the indoor unit 10 more harmonious and beautiful, meeting the higher aesthetic needs of users.

[0049] In addition, since the indoor unit 10 has two independent single-suction backward centrifugal fans 14 and two independent air outlets, the states of the two single-suction backward centrifugal fans 14 can be controlled according to the operation mode of the indoor unit 10 to control the air outlet position, achieve better heating / cooling effect and improve air supply comfort. For example, in the cooling mode, the single-suction backward centrifugal fan 14 that causes part of the airflow to flow to the upper part of the housing space in the shell can be controlled to open. Under the action of the single-suction backward centrifugal fan 14, the cold air flows to the upper part and blows forward through the upper air outlet 12a, while the other single-suction backward centrifugal fan 14 (the single-suction backward centrifugal fan 14 that causes part of the airflow to flow to the lower part of the housing space in the shell) remains closed, and the cold air is only blown forward from the upper air outlet 12a, raising the cold air outlet position to avoid the cold air blowing directly downward to the user and causing discomfort to the user. Since the cold air has a tendency to sink, the cold air is blown upward as much as possible to improve the cooling effect and avoid the cold air blowing directly to the human body and affecting the user's cooling experience.

[0050] In heating mode, the single-suction backward centrifugal fan 14 that causes part of the airflow to flow to the lower part of the housing space in the shell can be controlled to be turned on, while the other single-suction backward centrifugal fan 14 (the single-suction backward centrifugal fan 14 that causes part of the airflow to flow to the upper part of the housing space in the shell) is turned off, and the hot air is only blown forward from the lower air outlet 12b, which lowers the hot air outlet position, avoids the hot air rising and causing the temperature of the lower space in the room to fail to rise in time, affecting the user's heating experience. Since hot air has an upward trend, the hot air is blown downward as much as possible, so that the temperature of the upper space and the temperature of the lower space in the room are uniform, improving the heating effect and the user's heating experience.

[0051] In some embodiments, the housing includes a rear shell 11 with an open front side and a front panel 12 located at the front side of the rear shell 11 and forming a receiving space with the rear shell 11. Accordingly, the projections of the rear shell 11 and the front panel 12 on the vertical plane supporting the air conditioner indoor unit 10 are both circular. The rear shell 11 is formed with the aforementioned air inlet area 11a, the upper portion of the front panel 12 is formed with the aforementioned upper air outlet 12a, and the lower portion of the front panel 12 is formed with the aforementioned lower air outlet 12b.

[0052] In some embodiments, the diameter of the upper air outlet 12a is equal to the diameter of the lower air outlet 12b, and the ratio of the diameter of the upper air outlet 12a to the diameter of the shell is in the range of 0.2:1 to 0.3:1. For example, the ratio of the diameter of the upper air outlet 12a to the diameter of the shell is 0.26. In some embodiments, the upper air outlet 12a and the lower air outlet 12b are symmetrically distributed relative to the transverse center line of the shell. By designing the upper air outlet 12a and the lower air outlet 12b to be circular and symmetrically distributed, the upper air outlet 12a and the lower air outlet 12b are designed to meet the public's aesthetic standards, further increasing the aesthetics and coordination of the indoor unit 10.

[0053] In some embodiments, the ratio of the distance dimension between the center point of the upper air outlet 12a and the center point of the lower air outlet 12b to the shell diameter dimension ranges from 0.6:1 to 0.75:1. For example, the ratio of the distance dimension between the center point of the upper air outlet 12a and the center point of the lower air outlet 12b to the shell diameter dimension is 0.66. The position and size of the upper air outlet 12a and the lower air outlet 12b are designed in this way, so that the size and position of the upper air outlet 12a and the lower air outlet 12b can be more harmoniously matched with the overall size of the front panel 12, further increasing the aesthetics and coordination of the indoor unit 10.

[0054] In some embodiments, there may be only one air inlet area 11a, and the position of the air inlet area 11a formed in the shell satisfies that both air supply fans can drive the airflow outside the indoor unit 10 into the shell through the air inlet area 11a, for example, the air inlet area 11a is formed at the upper part or rear part of the shell.

[0055] In some embodiments, there may be two air inlet areas 11a, and the two air inlet areas 11a may be formed on both sides of the housing in the lateral direction (also referred to as the left-right direction or the width direction of the housing) such as Figure 2 The two air inlet areas 11a are symmetrically distributed relative to the longitudinal center line of the housing, further improving the aesthetics of the indoor unit 10.

[0056] The air conditioner indoor unit 10 of this embodiment further includes two heat exchangers 13, which correspond to the two air inlet areas 11a one by one and are respectively arranged inside the shell on the inner side of the corresponding air inlet area 11a to perform heat exchange with the ambient air entering through the corresponding air inlet area 11a.

[0057] like Figure 2 As shown, the projection of each heat exchanger 13 on a plane parallel to the rotation axis of the single-suction backward centrifugal fan 14 is arc-shaped to match the corresponding air inlet area 11a, increase the air inlet area, reduce the air inlet resistance, and improve the heat exchange efficiency of the heat exchanger 13. The center of the arc-shaped heat exchanger 13 can coincide with the center of the shell, and the two heat exchangers 13 are symmetrically distributed relative to the vertical center line of the shell, which ensures the size of the heat exchanger 13 and provides sufficient remaining space for the arrangement of the single-suction backward centrifugal fan 14 and other components in the shell.

[0058] In some embodiments, the maximum value of the lateral distance between the heat exchanger 13 and the corresponding air inlet area 11a ranges from 30 to 40 mm, and the size of the heat exchanger 13 is sufficient to cover the position relative to the air inlet area 11a, thereby ensuring the heat exchange efficiency of the heat exchanger 13.

[0059] In some embodiments, the air conditioner indoor unit 10 further includes two water receiving pans 16, which correspond to the two heat exchangers 13 one by one and are respectively located at the bottom of the corresponding heat exchangers 13. A drain port (not shown) is formed at the bottom of each water receiving pan 16, and the drain port is connected to a drain pipe, through which the condensed water received in the water receiving pan 16 is discharged.

[0060] In this embodiment, an air inlet area 11a is formed on both lateral sides of the shell, so as to increase the air intake volume of the indoor unit 10 on the one hand, and facilitate the arrangement of the water receiving tray 16 on the other hand, so that the arrangement position of the water receiving tray 16 is more reasonable, which is convenient for receiving the condensed water of the heat exchanger 13 and more reasonably allocates the space utilization in the shell.

[0061] Figure 3 is a schematic diagram of the appearance structure of an air-conditioning indoor unit 10 according to another embodiment of the present invention. Figure 4 1 is a schematic diagram of the internal structure of an air conditioner indoor unit 10 according to another embodiment of the present invention, wherein the front panel 12 is hidden to show the internal structure of the indoor unit 10. Figure 5 is an exploded schematic diagram of an air conditioner indoor unit 10 according to an embodiment of the present invention, Figure 6 1 is a schematic structural diagram of an air deflector 15 of an air conditioner indoor unit 10 according to an embodiment of the present invention.

[0062] In this embodiment, Figure 2 , Figure 4 and Figure 5As shown, the rotating shafts of the two single-suction backward centrifugal fans 14 are both extended laterally, and the two single-suction backward centrifugal fans 14 are located on both sides of the vertical center line of the shell in the lateral direction. The fan air inlet 14a of one single-suction backward centrifugal fan 14 faces the air inlet area 11a located on the same side as the single-suction backward centrifugal fan 14, and the fan air inlet 14a of the other single-suction backward centrifugal fan 14 faces the air inlet area 11a located on the same side as the single-suction backward centrifugal fan 14. That is to say, the fan air inlets 14a of the two single-suction backward centrifugal fans 14 face back to back and face the corresponding air inlet areas 11a, respectively, so as to encourage the ambient air around the indoor unit 10 to enter the shell through the corresponding air inlet areas 11a.

[0063] The fan outlet 14b of one of the single-suction backward centrifugal fans 14 is upward, and the fan outlet 14b of the other single-suction backward centrifugal fan 14 is downward. The single-suction backward centrifugal fan 14 with the fan outlet 14b upward is configured to cause part of the air flow to enter the shell through the air inlet area 11a corresponding to the single-suction backward centrifugal fan 14, exchange heat with the corresponding heat exchanger 13, and flow toward the upper part of the accommodating space, so that the part of the air flow is blown out from the upper air outlet 12a; the single-suction backward centrifugal fan 14 with the fan outlet 14b downward is configured to cause part of the air flow to enter the shell through the air inlet area 11a corresponding to the single-suction backward centrifugal fan 14, exchange heat with the corresponding heat exchanger 13, and flow toward the lower part of the accommodating space, so that the part of the air flow is blown out from the lower air outlet 12b, so that air flow is blown out from both the upper air outlet 12a and the lower air outlet 12b.

[0064] In some embodiments, Figure 6 As shown, in order to guide the airflow to the upper air outlet 12a and the lower air outlet 12b respectively, the air conditioner indoor unit 10 also includes two air guide covers 15 corresponding to the two single-suction backward centrifugal fans 14, each air guide cover 15 has an air collecting chamber connected to the fan outlet 14b of the corresponding single-suction backward centrifugal fan 14 and a guide air duct running through the air collecting chamber, and a guide air outlet 15b opposite to the corresponding air outlet is formed on the front side of the guide air duct. The air guide cover 15 is configured to guide the airflow of the fan outlet 14b of the corresponding single-suction backward centrifugal fan 14 to the corresponding air outlet, that is, the air guide cover 15 corresponding to the single-suction backward centrifugal fan 14 with the fan outlet 14b upward guides the airflow of the fan outlet 14b of the single-suction backward centrifugal fan 14 to the upper air outlet 12a, so that the airflow is blown forward from the upper air outlet 12a; the air guide cover 15 corresponding to the single-suction backward centrifugal fan 14 with the fan outlet 14b downward guides the airflow of the fan outlet 14b of the single-suction backward centrifugal fan 14 to the lower air outlet 12b, so that the airflow is blown forward from the lower air outlet 12b.

[0065] In some embodiments, the air guide cover 15 includes a horizontal wall 151 extending forward and backward, a curved wall 152, a front side wall 153, a rear side wall (not marked), and an arc-shaped partition wall 154. The horizontal wall 151 is formed with an air guide inlet 15a connected to the fan outlet 14b of the corresponding single-suction backward centrifugal fan 14, one end of the curved wall 152 in the circumferential direction is connected to one end of the horizontal wall 151 in the transverse direction, and the other end of the curved wall 152 in the circumferential direction is connected to the other end of the horizontal wall 151 in the transverse direction, thereby defining a cavity with the horizontal wall 151; the front side wall 153 connects the front side of the horizontal wall 151 with the front side of the curved wall 152. The front side of the air guide cover 15 is closed to close the front side of the cavity, and the rear side wall connects the rear side of the horizontal wall 151 and the rear side of the curved wall 152 to close the rear side of the air guide cover 15 to close the rear side of the cavity; the arc-shaped partition wall 154 is formed in the cavity to divide the cavity into the aforementioned air collecting cavity and the guide air duct, and the arc-shaped partition wall 154 is formed with an opening connecting the air collecting cavity and the guide air duct, and the front side wall 153 is formed with the aforementioned guide air outlet 15b opposite to the guide air duct. The air guide cover 15 thus formed has an air collecting cavity, and the airflow flowing out of the fan outlet 14b of the single-suction backward centrifugal fan 14 enters the air collecting cavity of the air guide cover 15, and is mixed in the air collecting cavity to ensure the uniformity of the air outlet; and the air guide cover 15 with the aforementioned special shape is used to cooperate with the single-suction backward centrifugal fan 14 to achieve smooth transition air supply, which can reduce airflow loss, reduce turbulence, thereby improving air supply efficiency and reducing noise.

[0066] In some embodiments, the guide air duct defined by the arc-shaped partition wall 154 and the curved wall 152 is preferably a cylindrical structure, that is, the portion of the curved wall 152 opposite to the arc-shaped partition wall 154 is an arc shape that forms a circular arc with the arc-shaped partition wall 154, so that the guide air duct defined by the cylindrical structure matches the corresponding circular air outlet shape, and the airflow of the guide air duct is directly blown forward through the corresponding air outlet, thereby improving the smoothness of the airflow delivery, reducing airflow loss, and further improving the air supply efficiency.

[0067] It can be understood that the single-suction backward centrifugal fan 14 generally includes a volute 141 having a accommodating chamber and an impeller (not shown) arranged in the accommodating chamber. In this embodiment, the accommodating chamber should extend laterally, the accommodating chamber has a fan air inlet 14a, the volute 141 has a fan air outlet 14b connected to the accommodating chamber, and the impeller can rotate around a transverse axis relative to the volute 141.

[0068] In some embodiments, in order to reduce the overall structural size of the entire indoor unit 10, two efficient single-suction backward centrifugal fans 14 are required to deliver air, so as to improve the performance requirements on the basis of meeting the appearance size of the indoor unit 10. Based on the centrifugal fan pressure loss, with the help of simulation analysis, each single-suction backward centrifugal fan 14 meets the following conditions:

[0069] The blade installation outlet angle βb2 of the impeller of each single-suction backward centrifugal fan 14 satisfies 30°≤βb2≤40°. For example, the blade installation outlet angle βb2 of each single-suction backward centrifugal fan 14 is 35°. The specific speed ns of each single-suction backward centrifugal fan 14 satisfies 58≤ns≤60. For example, the specific speed ns of each single-suction backward centrifugal fan 14 is 59.48. The circumferential speed u2 of each single-suction backward centrifugal fan 14 satisfies 11≤u2≤12 m / s. For example, the circumferential speed u2 of each single-suction backward centrifugal fan 14 is 11.83 m / s. The total pressure coefficient Ψ of each single-suction backward centrifugal fan 14 satisfies 0.7≤Ψ≤0.9. For example, the total pressure coefficient Ψ of each single-suction backward centrifugal fan 14 is 0.88.

[0070] In this way, by adopting a single-suction backward centrifugal fan as the air supply fan of this embodiment, the air supply efficiency is higher than that of the forward centrifugal fan, and since the airflow through the curved blade path of the air supply fan forms a speed difference due to the centrifugal force, the single-suction backward centrifugal fan can alleviate the degree of unevenness caused by the airflow speed difference. In addition, by limiting the installation outlet angle βb2, specific speed ns, circumferential speed u2 and total pressure coefficient Ψ of the single-suction backward centrifugal fan to the above special numerical range, the pressure loss of the single-suction backward centrifugal fan can be reduced and the air intake of the single-suction backward centrifugal fan can be increased. At the same time, under the premise of ensuring the above-mentioned better performance of the single-suction backward centrifugal fan, the size of each single-suction backward centrifugal fan can be adjusted to a lower size, for example, each single-suction backward centrifugal fan meets: Ф120*80mm, that is, the diameter of the volute is 120 mm and the thickness is 80 mm.

[0071] This ensures that the size of the indoor unit 10 can be adjusted to a lower size. For example, the overall size of the shell is Φ500*200mm, that is, the diameter of the shell is 500mm and the thickness is 220mm. The diameters of the upper air outlet 12a and the lower air outlet 12b can both be 120mm. Under the premise of ensuring the air supply performance of the indoor unit 10, the overall size of the indoor unit 10 is reduced to meet the user's demand for a miniaturized appearance of the air conditioner indoor unit 10.

[0072] Figure 7 is a schematic structural diagram of an air outlet duct 18 of an air conditioner indoor unit 10 in one direction according to an embodiment of the present invention. Figure 8 FIG. 1 is a schematic cross-sectional view of an air outlet duct 18 of an air conditioner indoor unit 10 according to an embodiment of the present invention.

[0073] In some embodiments, Figures 3 to 5 , and refer to Figure 7As shown, the air conditioner indoor unit 10 also includes two air outlet ducts 18 extending front to back and distributed up and down in the accommodating space. The upper air outlet duct 18 passes through the guide air outlet 15b of the upper air guide cover 15 and is located in the guide air duct. The lower air outlet duct 18 passes through the guide air outlet 15b of the lower air guide cover 15 and is located in the guide air duct.

[0074] Each air outlet pipe 18 includes an outer pipe 181 extending forward and backward and a first inner pipe 182 connected to the inner wall of the outer pipe 181 and extending gradually from back to front to protrude from the front side of the outer pipe 181. The air inlet end of the outer pipe 181 passes through the guide outlet 15b of the corresponding air guide cover 15 and is located in the corresponding guide air duct, so that the heat exchange air flow enters the corresponding air outlet pipe 18 from the guide air duct through the air inlet end of the outer pipe 181. The air inlet end of the first inner tube 182 is located in the outer tube 181 near the front end of the outer tube 181, and the air outlet end of the first inner tube 182 protrudes from the front side of the corresponding air outlet, and a first spacing space 103 is formed between the inner peripheral wall of the outer tube 181 and the outer peripheral wall of the first inner tube 182, that is, the first inner tube 182 is a trumpet-shaped structure from back to front, and the outer tube 181 and the first inner tube 182 form a round tube, and part of the heat exchange airflow can flow forward through the internal space of the first inner tube 182, and part of the heat exchange airflow can flow forward through the first spacing space 103. This increases the air outlet range and achieves a better air supply effect.

[0075] In some embodiments, each air outlet duct 18 further includes a second inner tube 183, which gradually extends from the back to the front in the corresponding first inner tube 182, and a second partition space 104 is formed between the outer peripheral wall of the second inner tube 183 and the inner peripheral wall of the corresponding first inner tube 182. The heat exchange air flowing to the upper part of the shell accommodating space enters the outer tube 181 and is divided into three parts, part of the heat exchange air flows through the space in the second inner tube 183 and blows forward, part of the heat exchange air flows through the first partition space 103 and blows forward, and part of the heat exchange air flows through the second partition space 104 and blows forward; the heat exchange air flowing to the lower part of the shell accommodating space enters the outer tube 181 and is also divided into three parts and blows forward. As a result, the air flow is blown forward in a more dispersed manner, further improving the uniformity and comfort of air supply.

[0076] In this embodiment, by designing each air outlet pipe 18 as a zigzag structure as described above, the air outlet range can be increased and a wide-area air supply effect can be achieved; and the heat exchange air flows toward the front side of the air outlet corresponding to the indoor unit 10 and diffuses around it, sucking in the surrounding air to flow forward, further improving the uniformity of air supply, making the wind softer and more natural, and feeling cool but not cold when blowing on people, thereby improving user comfort.

[0077] The first inner tube 182 passes through the bracket ( Figure 8 ) is connected to the inner wall of the outer tube 181, and the second inner tube is connected to the inner wall of the outer tube 181 by another bracket ( Figure 8 The bracket (not shown) is connected to the inner wall of the first inner tube 182, and the bracket plays the role of fixing the first inner tube 182 and the second inner tube 183, and is small in size to avoid blocking the forward flow of the airflow. For example, the outer wall of the first inner tube 182 is spaced apart with a plurality of first connecting rods (not shown) along the circumferential direction, and the plurality of first connecting rods constitute the aforementioned bracket, and the first inner tube 182 is fixed to the outer tube through the plurality of first connecting rods distributed at intervals. Correspondingly, the outer wall of the second inner tube 183 is distributed with a plurality of second connecting rods (not shown), and the plurality of second connecting rods constitute the aforementioned other bracket, and the second inner tube 183 is fixed to the first inner tube 182 through the plurality of second connecting rods distributed at intervals.

[0078] In some embodiments, Figure 8 As shown, the inner circumferential wall of the outer tube 181 of each air outlet duct 18 includes a rear wall section 181a and a front wall section 181b which are connected in sequence from the air inlet end to the air outlet end of the outer tube 181. The rear wall section 181a is a hollow truncated cone which gradually expands from the air inlet end of the outer tube 181 to the front, and the front wall section 181b is a hollow truncated cone which gradually expands from the position connected to the rear wall section 181a to the air outlet end of the outer tube 181, and the cone angle 2e of the rear wall section 181a is greater than the cone angle 2c of the front wall section 181b. It can also be understood that the inner circumferential wall of the outer tube 181 is divided into two sections from the rear end to the front end of the outer tube 181, namely the rear wall section 181a and the front wall section 181b, and the rear wall section 181a is a trumpet-shaped which gradually expands from the back to the front, and the front wall section 181b is a trumpet-shaped which gradually expands from the back to the front, and the degree of gradual expansion of the rear wall section 181a is greater than that of the front wall section 181b. As shown Figure 8 As shown, angle e is the angle between the wall surface of the rear wall section 181a and the horizontal line extending front and back, and the cone angle of the rear wall section 181a is 2e; angle c is the angle between the wall surface of the front wall section 181b and the horizontal line extending front and back, and the cone angle of the front wall section 181b is 2c.

[0079] The air inlet end of the first inner tube 182 is located in the space formed by the front wall section 181b, so as to form a first spacing space 103 between the front wall section 181b and the outer peripheral wall of the first inner tube 182, so as to ensure that the airflow enters the outer tube 181, is first mixed and combed in the rear wall section 181a of the outer tube 181, and then flows forward and blows out along different flow paths, thereby reducing eddy current losses. The air inlet end of the first inner tube 182 (that is, the rear end of the first inner tube 182) is approximately the same distance from the rear end of the front wall section 181b of the outer tube 181 as from the front end of the front wall section 181b (that is, the air outlet end of the outer tube 181).

[0080] In some embodiments, the first inner tube 182 is a hollow truncated cone with uniform wall thickness, which gradually expands from its air inlet end to its air outlet end, and the cone angle 2b of the first inner tube 182 is greater than the cone angle 2c of the front wall section 181b of the outer tube 181. It can also be understood that the first inner tube 182 is a gradually expanding trumpet shape from its rear end to the front end.

[0081] In some embodiments, the second inner tube 183 of the air outlet duct 18 extends from back to front in a gradually expanding manner in the corresponding first inner tube 182. It can be understood that the second inner tube 183 is entirely in the first inner tube 182, and is in a gradually expanding trumpet shape from back to front, and the outer peripheral wall of the second inner tube 183 is a truncated cone that gradually expands from back to front. The inner peripheral wall of the second inner tube 183 is a truncated cone that gradually expands from the air inlet end to the air outlet end of the second inner tube 183, that is, the inner peripheral wall of the second inner tube 183 is a truncated cone that gradually expands from back to front. The cone angle 2d of the inner peripheral wall of the second inner tube 183 is greater than the cone angle 2a of the outer peripheral wall of the second inner tube 183, and the cone angle 2a of the outer peripheral wall of the second inner tube is equal to the cone angle 2c of the front wall section 181b of the outer tube 181.

[0082] By limiting the inner wall of the outer tube 181 to the above structure, and limiting the shapes of the first inner tube 182 and the second inner tube 183 to the above structure, the first spacing space 103 (the space between the outer tube 181 and the first inner tube 182), the second spacing space 104 (the space between the first inner tube 182 and the second inner tube 183) and the space within the second inner tube 183 defined thereby can divert the airflow, expand the air outlet range, further reduce eddy losses, and improve air supply efficiency; and make the air outlet softer and more uniform.

[0083] In some embodiments, the cone angle 2c of the front wall section 181b satisfies: 0°<2c≤40°, and the cone angle 2e of the rear wall section 181a satisfies: 0°<2e≤50°. For example, the cone angle 2c of the front wall section 181b is 7.8°, and the cone angle 2e of the rear wall section 181a is 46.2°. In some embodiments, the cone angle 2b of the first inner tube 182 may satisfy: 20°<2b≤80°, and the cone angle 2d of the inner circumferential wall of the second inner tube 183 may satisfy: 30°<2d≤60°. For example, the cone angle 2b of the first inner tube 182 is 60°, and the cone angle 2d of the inner circumferential wall of the second inner tube 183 is 45°. The air outlet duct 18 thus formed can further reduce eddy current loss and improve air supply efficiency.

[0084] In some embodiments, each air outlet duct 18 is configured to be controllably movable along the front-to-back direction between a position protruding from the front side of the air outlet of the corresponding indoor unit 10 and a position retracted into the air outlet of the corresponding indoor unit 10, that is, the upper air outlet duct 18 is configured to be controllably movable along the front-to-back direction between a position protruding from the front side of the upper air outlet 12a and a position retracted into the upper air outlet 12a, and the lower air outlet duct 18 is configured to be controllably movable along the front-to-back direction between a position protruding from the front side of the lower air outlet 12b and a position retracted into the lower air outlet 12b.

[0085] Specifically, when the air outlet duct 18 is controlled to retract backward to the position in the corresponding air outlet, the outer peripheral wall of the air outlet end of the first inner tube 182 abuts against the inner peripheral wall of the corresponding air outlet to close the first compartment 103, so that part of the heat exchange airflow is blown out from the second inner tube 183 to the front side, and part of the heat exchange airflow is blown out from the second compartment 104 to the front side. In other words, when the air outlet duct 18 located at the top is controlled to retract to the position in the upper air outlet 12a, the outer peripheral wall of the air outlet end of the first inner tube 182 of the air outlet duct 18 abuts against the inner peripheral wall of the upper air outlet 12a, and part of the heat exchange airflow flowing to the upper part of the housing space is blown out from the second inner tube 183 of the air outlet duct 18 located at the top, and part of the heat exchange airflow is blown out from the second compartment 104 to the front side. When the air outlet duct 18 located below is controlled to retract to the position in the lower air outlet 12b, the outer peripheral wall of the air outlet end of the first inner tube 182 of the air outlet duct 18 abuts against the inner peripheral wall of the lower air outlet 12b, and part of the heat exchange airflow flowing to the lower part of the accommodating space in the shell is blown forward from the second inner tube 183 of the air outlet duct 18 located below, and part of the heat exchange airflow is blown forward from the second partition space 104.

[0086] When the air outlet duct 18 is controlled to move forward to a position protruding from the front side of the corresponding air outlet, the air outlet end of the first inner tube 182 protrudes from the front side of the corresponding air outlet. Since the first inner tube 182 gradually expands from back to front, it can be understood that the outer diameter of the front section of the first inner tube 182 is greater than the outer diameter of the rear section. When the air outlet duct 18 moves forward, the air outlet end of the first inner tube 182 is separated from the inner circumferential wall of the corresponding air outlet, and the air outlet end of the first inner tube 182 protrudes from the front side of the corresponding air outlet, so that the space between the outer wall of the first inner tube 182 and the inner wall of the outer tube 181 (the first partition space 103) is exposed, so that the heat exchange airflow in the first partition space 103, the second partition space 104 and the second inner tube 183 is blown forward.

[0087] The movement of the two air outlet ducts 18 and the state of the two single-suction backward centrifugal fans 14 can be controlled according to the operation mode of the air conditioner indoor unit 10. For example, in the cooling mode, the air outlet duct 18 corresponding to the upper air outlet 12a can be controlled to move to a position protruding from the front side of the upper air outlet 12a, and the single-suction backward centrifugal fan 14 that causes part of the air flow to flow to the upper part of the housing space in the shell can be controlled to open; while the air outlet duct 18 corresponding to the lower air outlet 12b can be kept in the lower air outlet 12b and not move forward. Accordingly, the corresponding single-suction backward centrifugal fan 14 (that is, the single-suction backward centrifugal fan 14 that causes part of the air flow to flow to the lower part of the housing space in the shell) remains closed, and the cold air is only blown forward through the air outlet duct 18 located at the upper part, raising the cold air outlet position to avoid the cold air blowing directly downward to the user and causing discomfort to the user. Since the cold air has a tendency to sink, the cold air is blown upward as much as possible to improve the cooling effect and avoid the cold air blowing directly to the human body and affecting the user's cooling experience. In addition, since the air outlet duct 18 located at the upper portion is moved forward to protrude from the front side of the upper air outlet 12a, the air supply range is expanded, the air supply uniformity is improved, and the user's cooling comfort experience is further enhanced.

[0088] In the heating mode, the air outlet 18 corresponding to the lower air outlet 12b can be controlled to move to a position protruding from the front side of the lower air outlet 12b, and the corresponding single-suction backward centrifugal fan 14 (that is, the single-suction backward centrifugal fan 14 that causes part of the airflow to flow to the lower part of the storage space in the shell) can be controlled to open, while the air outlet 18 corresponding to the upper air outlet 12a can be kept in the upper air outlet 12a and not move forward. Correspondingly, the corresponding single-suction backward centrifugal fan 14 (that is, the single-suction backward centrifugal fan 14 that causes part of the airflow to flow to the upper part of the storage space in the shell) remains closed, and the hot air is only blown forward through the air outlet 18 located at the bottom, which lowers the hot air outlet position, avoids the hot air rising and causing the temperature of the lower space in the room to fail to rise in time, affecting the user's heating experience. Since the hot air has an upward trend, the hot air is blown downward as much as possible, so that the temperature of the upper space and the temperature of the lower space in the room are uniform, thereby improving the heating effect and the user's heating experience. In addition, since the air outlet duct 18 located at the lower portion is moved forward to protrude from the front side of the lower air outlet 12b, the air supply range is expanded, the air supply uniformity is improved, and the user's heating comfort experience is further enhanced.

[0089] In this embodiment, Figure 2 , Figure 4 and Figure 5As shown, the air conditioner indoor unit 10 further includes an electric control board 17, which is disposed between the two single-suction backward centrifugal fans 14. The electric control board 17 is configured to control the operation of the two single-suction backward centrifugal fans 14. In some embodiments, the electric control board 17 also controls the movement of the two air outlet ducts 18. The electric control board 17 is arranged in the space between the two single-suction backward centrifugal fans 14, so that the arrangement of the components in the housing is compact and orderly, and the overall size of the indoor unit 10 is further reduced.

[0090] like Figure 4 , Figure 5 as well as Figure 7 As shown, the air-conditioning indoor unit 10 of this embodiment also includes two driving units, and the two driving units correspond to the two air outlet ducts 18 one by one. Each driving unit may include a rack 102, a gear (not shown) and a motor (not shown) for driving the gear to rotate, wherein the motor is arranged in the accommodating space of the shell, and the gear is engaged with the rack 102 to drive the corresponding air outlet duct 18 to move along the front-to-back direction between a position protruding from the front side of the corresponding air outlet and a position retracted into the corresponding air outlet.

[0091] The length of the tooth segment of the rack 102 that meshes with the gear should be equal to or greater than the distance between the corresponding air outlet end of the outer tube 181 and the air outlet end of the first inner tube 182, so as to ensure that the air outlet duct 18 can be moved forward so that the part of the first inner tube 182 located in front of the outer tube 181 is completely extended out of the corresponding air outlet of the indoor unit 10, so as to further increase the air outlet range and air supply distance, and improve the air supply efficiency and air outlet uniformity.

[0092] The air inlet end of the air outlet pipe 18 is in sliding contact with the inner wall of the corresponding guide air duct, and during the forward and backward movement of the air outlet pipe 18, the rear section of the air outlet pipe 18 is always in the guide air duct of the corresponding guide cover 15. It can be understood that the size of the air outlet pipe 18, the size of the guide air duct, and the size of the opening connecting the air collecting cavity and the guide air duct formed by the arc-shaped partition wall 154 need to ensure that when the air outlet pipe 18 moves forward or backward, the heat exchange air can enter the guide air duct through the air collecting cavity.

[0093] In some implementations of this embodiment, the rack 102 may be formed on the outer peripheral wall of the corresponding air outlet pipe 18, extending from front to rear. Figure 5 and Figure 6The two air guide ducts of the two air guide covers 15 are formed with front-to-rear extending notches 15c adapted to the corresponding racks 102 on the air outlet pipe 18. The racks 102 pass through the notches 15c so that the teeth of the racks 102 are exposed on the outside of the air guide duct of the air guide cover 15 to engage with the corresponding gears, thereby realizing the front-to-rear movement of the air outlet pipe 18 and maintaining the sealing of the air guide duct. The length of the racks 102 is sufficient to extend along the corresponding notches 15c to the rear side of the air guide duct to ensure that when the air outlet pipe 18 moves forward, the notch 15c of the air guide duct is always covered by the racks 102 to ensure the sealing of the air guide duct.

[0094] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. An air conditioner indoor unit, comprising: A housing, wherein the housing is formed with an air inlet area, an upper air outlet is formed at an upper front side of the housing, and a lower air outlet is formed at a lower front side of the housing; Two single-suction backward centrifugal fans are arranged in the accommodation space inside the shell, wherein one of the single-suction backward centrifugal fans is configured to cause part of the airflow to flow from the air inlet area to the upper part of the accommodation space, so that the part of the airflow is blown out from the upper air outlet, and the other single-suction backward centrifugal fan is configured to cause part of the airflow to flow from the air inlet area to the lower part of the accommodation space, so that the part of the airflow is blown out from the lower air outlet; The upper air outlet and the lower air outlet are recorded as two air outlets of the air conditioner indoor unit; Each air outlet pipe is configured to be controllably movable along the front-to-back direction between a position protruding from the front side of the corresponding air outlet and a position retracted to the corresponding air outlet; The air conditioner indoor unit further includes two air guide covers corresponding to the two single-suction backward centrifugal fans, each of the air guide covers having an air collecting cavity connected to the fan air outlet of the corresponding single-suction backward centrifugal fan and an air guide duct penetrating the air collecting cavity, and an air guide outlet opposite to the corresponding air outlet is formed on the front side of the air guide duct to guide the heat exchange airflow to the corresponding air outlet; The projections of the upper air outlet and the lower air outlet parallel to the rotation axis of the centrifugal fan are both circular; The air conditioner indoor unit also includes: Two air outlet pipes extending front and back and distributed up and down in the accommodation space, the air outlet pipe located at the top corresponds to the air guide cover located at the top, and the air outlet pipe located at the bottom corresponds to the air guide cover located at the bottom; Each of the air outlet pipes comprises an outer pipe extending forward and backward and a first inner pipe connected to the inner peripheral wall of the outer pipe and extending from the back to the front in a gradually expanding manner to protrude from the front side of the outer pipe. The air inlet end of the outer pipe passes through the guide air outlet of the corresponding air guide cover and is located in the corresponding guide air duct, so that the heat exchange airflow enters the corresponding air outlet pipe; The air inlet end of the first inner tube is located in the outer tube near the front end of the outer tube, the air outlet end of the first inner tube protrudes from the front side of the corresponding air outlet, and a first spacing space is formed between the inner peripheral wall of the outer tube and the outer peripheral wall of the first inner tube to facilitate the passage of heat exchange airflow; Each of the air outlet pipes also includes a second inner pipe, which gradually extends from back to front in the corresponding first inner pipe, and a second spacing space is formed between the outer peripheral wall of the second inner pipe and the inner peripheral wall of the corresponding first inner pipe to facilitate the passage of heat exchange airflow.

2. The air conditioner indoor unit according to claim 1, wherein Each of the single-suction backward centrifugal fans comprises: A volute having a transversely extending accommodating cavity, the accommodating cavity having a fan air inlet, and the volute also having a fan air outlet communicated with the accommodating cavity; An impeller is disposed in the accommodating chamber and is rotatable about a transverse axis relative to the volute; The impeller blade installation outlet angle is 30° to 40°.

3. The air conditioning indoor unit according to claim 1, wherein The specific speed of each of the single-suction backward centrifugal fans is 58 to 60.

4. The air conditioning indoor unit according to claim 1, wherein The peripheral speed of each of the single-suction backward centrifugal fans is 11 to 12 m / s.

5. The air conditioner indoor unit according to claim 1, wherein The total pressure coefficient of each of the single-suction backward centrifugal fans is 0.7 to 0.

9.

6. The air conditioning indoor unit according to claim 1, wherein The single-suction backward centrifugal fan that forces part of the airflow to flow toward the upper portion of the accommodating space has an upward fan outlet, and the single-suction backward centrifugal fan that forces part of the airflow to flow toward the lower portion of the accommodating space has a downward fan outlet.

7. The air conditioning indoor unit according to claim 1, wherein When the air outlet pipe is retracted to the position in the corresponding air outlet, the outer peripheral wall of the air outlet end of the first inner pipe abuts against the inner peripheral wall of the corresponding air outlet to close the first interval space, so that the heat exchange airflow is blown out to the front side from the second interval space and the second inner pipe respectively; When the air outlet pipe is located at a position protruding from the front side of the corresponding air outlet, the air outlet end of the first inner tube protrudes from the front side of the corresponding air outlet to expose the first partition space, so that the heat exchange airflow is blown toward the front side from the first partition space, the second partition space and the second inner tube respectively.

8. The air conditioner indoor unit according to claim 1, wherein The inner peripheral wall of the outer tube includes a rear wall section and a front wall section which are connected in sequence from the air inlet end to the air outlet end of the outer tube, and the air inlet end of the first inner tube is located in the space formed by the front wall section to form the first spacing space between the front wall section and the outer peripheral wall of the first inner tube; The rear wall section is a hollow truncated cone that gradually expands forward from the air inlet end of the outer tube, and the front wall section is a hollow truncated cone that gradually expands from the position connected to the rear wall section to the air outlet end of the outer tube; and The taper angle of the rear wall section is greater than the taper angle of the front wall section.

Images