Indoor unit and air conditioner with same

Abstract

The indoor unit comprises a driving mechanism, a first fan blade, a speed change mechanism and a second fan blade, the speed change mechanism is provided with a first rotating shaft and a second rotating shaft, the first rotating shaft is connected with the first fan blade, and the second rotating shaft is connected with the second fan blade. The first fan blade and the second fan blade are located on the two sides of the speed change mechanism respectively, and the driving mechanism is in driving connection with one of the first fan blade and the second fan blade. According to the fan, due to the fact that the speed change mechanism is additionally arranged to connect the first fan blade with the second fan blade, when the driving mechanism drives one of the first fan blade and the second fan blade to rotate, through the transmission and speed change effects of the speed change mechanism, the other one of the first fan blade and the second fan blade can synchronously rotate; and the rotating speeds of the first fan blade and the second fan blade can be the same or different, so that the rotating speeds of the two fan blades can be controlled to be mutually independent and adjustable by only utilizing one driving mechanism, and the cost is saved.

Description

Technical Field

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

[0002] As living standards improve, people's requirements for their living environment are becoming increasingly demanding. To maintain a comfortable ambient temperature, air conditioners have become indispensable. The dehumidification function of air conditioners is crucial for use in humid environments. According to the dehumidification principle of air conditioners, to handle indoor latent heat loads, the evaporation temperature of the indoor heat exchanger must be lowered below the air dew point, thereby condensing water vapor in the indoor air into water and reducing humidity. This process typically lowers the indoor temperature, impacting user comfort. Furthermore, during low-temperature dehumidification, the unit can frequently enter and exit anti-freeze protection, resulting in poor dehumidification effectiveness. To address these issues, existing technical solutions propose indoor units that include side-by-side heat exchange and dehumidification vents, each equipped with two sets of heat exchangers and crossflow blades to achieve dual temperature and humidity control, preventing the problem of excessively low temperatures during dehumidification. To achieve independent and adjustable speeds for the two crossflow blades, existing technical solutions use two DC motors to control each blade, resulting in high costs. Summary of the Invention

[0003] Therefore, the present invention provides an indoor unit that can solve the technical problem that the rotational speeds of the two cross-flow blades of an indoor unit with a dehumidification function need to be independent and adjustable, and two motors are required to control the two cross-flow blades respectively, which causes high costs.

[0004] In order to solve the above problems, the present invention provides an indoor unit, including a driving mechanism, a first fan blade, a speed changing mechanism and a second fan blade, the speed changing mechanism having a first rotating shaft and a second rotating shaft, the first rotating shaft being connected to the first fan blade, the second rotating shaft being connected to the second fan blade, the first fan blade and the second fan blade being respectively located on both sides of the speed changing mechanism, and the driving mechanism being driven and connected to one of the first fan blade and the second fan blade.

[0005] In some embodiments, the speed change mechanism includes a first conical wheel, a second conical wheel and a first transmission belt, the first conical wheel and the second conical wheel are arranged at an interval, the first transmission belt is simultaneously mounted on the first conical wheel and the second conical wheel, the first rotating shaft is configured to rotate synchronously with the first conical wheel, and the second rotating shaft is configured to rotate synchronously with the second conical wheel, and any one of the first conical wheel and the second conical wheel can move along the axial direction of the speed change mechanism to change the relative position relationship between the first transmission belt and the first conical wheel and the second conical wheel, thereby changing the transmission ratio between the first conical wheel and the second conical wheel.

[0006] In some embodiments, the speed change mechanism further includes a telescopic component connected to one of the first conical gear and the second conical gear.

[0007] In some embodiments, the first rotating shaft is connected to the first conical gear via a first transmission assembly, the second rotating shaft is connected to the second conical gear via a second transmission assembly, and the axis of the first rotating shaft coincides with the axis of the second rotating shaft.

[0008] In some embodiments, the transmission ratio produced by the first transmission assembly is the same as the transmission ratio produced by the second transmission assembly.

[0009] In some embodiments, the first transmission assembly includes a first gear and a second gear, the first gear is mounted on the first rotating shaft, the first bevel gear has a first insertion portion, the second gear is mounted on the first insertion portion, and the first gear is meshed with the second gear.

[0010] In some embodiments, the first transmission assembly includes a first pulley, a second pulley and a second transmission belt, the first pulley is mounted on the first rotating shaft, the first cone pulley has a first insertion portion, the second pulley is mounted on the first insertion portion, the first pulley and the second pulley are spaced apart, and the second transmission belt is mounted on the first pulley and the second pulley at the same time.

[0011] In some embodiments, when the first transmission assembly includes the second gear, after the second gear is mounted on the first insertion portion, the first bevel gear can move axially along the second gear through the first insertion portion; when the first transmission assembly includes the second pulley, after the second pulley is mounted on the first insertion portion, the first bevel gear can move axially along the second pulley through the first insertion portion.

[0012] In some embodiments, the second transmission assembly includes a third gear, a fourth gear, a third rotating shaft, a fifth gear, and a sixth gear, the third gear is mounted on the second rotating shaft, the fourth gear and the fifth gear are both mounted on the third rotating shaft, the second bevel gear has a second plug-in portion, the sixth gear is mounted on the second plug-in portion, the third gear is meshed with the fourth gear, and the fifth gear is meshed with the sixth gear.

[0013] In some embodiments, the second transmission assembly includes a third pulley, a fourth pulley, a third rotating shaft, a third transmission belt, a fifth pulley, a sixth pulley and a fourth transmission belt, the third pulley is mounted on the second rotating shaft, the fourth pulley and the fifth pulley are both mounted on the third rotating shaft, the second cone pulley has a second plug-in portion, the sixth pulley is mounted on the second plug-in portion, the third pulley and the fourth pulley are spaced apart, the third transmission belt is simultaneously mounted on the third pulley and the fourth pulley, the fifth pulley and the sixth pulley are spaced apart, and the fourth transmission belt is simultaneously mounted on the fifth pulley and the sixth pulley.

[0014] In some embodiments, when the second transmission assembly includes the sixth gear, after the sixth gear is mounted on the second insertion portion, the second bevel gear can move axially along the sixth gear through the second insertion portion; when the second transmission assembly includes the sixth pulley, after the sixth pulley is mounted on the second insertion portion, the second bevel gear can move axially along the sixth pulley through the second insertion portion.

[0015] The present invention also provides an air conditioner, comprising the aforementioned indoor unit.

[0016] The present invention provides an indoor unit and an air conditioner having the same, which have the following beneficial effects:

[0017] Since the present application adds a speed changing mechanism to connect the first fan blade and the second fan blade, when the driving mechanism drives one of the first fan blade and the second fan blade to rotate, the transmission and speed changing action of the speed changing mechanism can not only make the other of the first fan blade and the second fan blade rotate synchronously, but also make the rotation speeds of the first fan blade and the second fan blade the same or different. In this way, it is possible to use only one driving mechanism to control the rotation speeds of the two fan blades independently and adjustable, thereby saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0019] Figure 1 is a schematic diagram of an indoor unit according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the appearance of a speed change mechanism according to an embodiment of the present invention;

[0021] Figure 3 is a cross-sectional view of a speed change mechanism according to a first embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the internal structure of the speed change mechanism according to the first embodiment of the present invention at a first viewing angle;

[0023] Figure 5 Schematic diagram of the internal structure of the speed change mechanism according to the first embodiment of the present invention from a second viewing angle;

[0024] Figure 6 Schematic diagram of the internal structure of the speed change mechanism according to the second embodiment of the present invention from a first viewing angle;

[0025] Figure 7 Schematic diagram of the internal structure of the speed change mechanism according to the second embodiment of the present invention from a second viewing angle.

[0026] The reference numerals indicate:

[0027] 1. Driving mechanism; 2. First fan blade; 3. Speed changing mechanism; 31. First rotating shaft; 32. Second rotating shaft; 33. First bevel pulley; 34. Second bevel pulley; 35. First transmission belt; 36. Telescopic component; 37. First gear; 38. Second gear; 39. First pulley; 40. Second pulley; 41. Second transmission belt; 42. Third gear; 43. Fourth gear; 44. Third rotating shaft; 45. Fifth gear; 46. Sixth gear; 47. Third pulley; 48. Fourth pulley; 49. Third transmission belt; 50. Fifth pulley; 51. Sixth pulley; 52. Fourth transmission belt; 53. Housing; 54. Speed sensor; 4. Second fan blade; 5. Bottom housing. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0032] See also Figures 1 to 7 As shown, according to an embodiment of the present invention, an indoor unit is provided, including a drive mechanism 1, a first fan blade 2, a speed change mechanism 3 and a second fan blade 4, the speed change mechanism 3 has a first rotating shaft 31 and a second rotating shaft 32, the first rotating shaft 31 is connected to the first fan blade 2, and the second rotating shaft 32 is connected to the second fan blade 4, the first fan blade 2 and the second fan blade 4 are respectively located on both sides of the speed change mechanism 3, and the drive mechanism 1 is drivingly connected to one of the first fan blade 2 and the second fan blade 4.

[0033] In this technical solution, since the present application adds a speed change mechanism 3 to connect the first fan blade 2 and the second fan blade 4, when the driving mechanism 1 drives one of the first fan blade 2 and the second fan blade 4 to rotate, the transmission and speed change action of the speed change mechanism 3 can not only make the other of the first fan blade 2 and the second fan blade 4 rotate synchronously, but also make the speeds of the first fan blade 2 and the second fan blade 4 the same or different. In this way, it is possible to use only one driving mechanism 1 to control the speeds of the two fan blades independently and adjustable, thereby saving costs. At the same time, for dehumidification of the indoor unit, the installation positions of the first fan blade 2 and the second fan blade 4 correspond to the reheating part and the dehumidification part of the indoor heat exchanger, respectively. The first fan blade 2 and the second fan blade 4 are responsible for reheating the air intake and dehumidifying the air intake, respectively. The speed change mechanism 3 separates the first fan blade 2 and the second fan blade 4, which is equivalent to forming two air cavities. This can reduce the mutual interference between the reheating air intake and the dehumidifying air intake, so there is no need to add a separate partition structure on the bottom shell 5 to separate the two sides. Preferably, the driving mechanism 1 is a motor, and the first fan blade 2 and the second fan blade 4 are both cross-flow fan blades.

[0034] See also Figures 2 to 7 As shown, the speed change mechanism 3 includes a first conical wheel 33, a second conical wheel 34 and a first transmission belt 35. The first conical wheel 33 and the second conical wheel 34 are arranged at an interval. The first transmission belt 35 is simultaneously sleeved on the first conical wheel 33 and the second conical wheel 34. The first rotating shaft 31 is configured to rotate synchronously with the first conical wheel 33, and the second rotating shaft is configured to rotate synchronously with the second conical wheel 34. Any one of the first conical wheel 33 and the second conical wheel 34 can move along the axial direction of the speed change mechanism 3 to change the relative position relationship between the first transmission belt 35 and the first conical wheel 33 and the second conical wheel 34, thereby changing the transmission ratio between the first conical wheel 33 and the second conical wheel 34.

[0035] In this embodiment, by enabling either the first or second bevel gear 33 , 34 to move axially along the transmission mechanism 3 , the relative position between the first and second bevel gears 33 , 34 can be changed, thereby changing the position of the first transmission belt 35 on the first and second bevel gears 33 , 34 . This, in turn, changes the transmission ratio between the first and second bevel gears 33 , 34 , ultimately achieving independent and adjustable rotational speeds for the first and second impeller blades 2 , 4 . It will be appreciated that the first transmission belt 35 is made of an elastic material and can change its circumference and maintain constant tension at various positions on the first and second bevel gears 33 , 34 , thereby ensuring stable power transmission. Preferably, the first and second bevel gears 33 , 34 face opposite directions.

[0036] See also Figures 4 to 7As shown, the speed change mechanism 3 further includes a telescopic component 36, which is connected to one of the first bevel gear 33 and the second bevel gear 34. When the telescopic component 36 is extended or retracted, either the first bevel gear 33 or the second bevel gear 34 can be moved axially along the speed change mechanism 3. The telescopic component 36 is preferably an electric push rod.

[0037] See also Figures 1 to 3 As shown, the first rotating shaft 31 is connected to the first cone gear 33 through the first transmission assembly, the second rotating shaft 32 is connected to the second cone gear 34 through the second transmission assembly, and the axis of the first rotating shaft 31 coincides with the axis of the second rotating shaft 32.

[0038] In this technical solution, when the first rotating shaft 31 is directly connected to the first conical pulley 33, and the second rotating shaft 32 is directly connected to the second conical pulley 34, while the rotational speeds of the first rotating shaft 31 and the second rotating shaft 32 can be independently and adjustable, thereby achieving independent and adjustable rotational speeds of the first fan blade 2 and the second fan blade 4, the first rotating shaft 31 and the second rotating shaft 32 will inevitably be misaligned, thereby causing misalignment between the first fan blade 2 and the second fan blade 4. This will cause three problems: first, it is difficult to install the first fan blade 2, the speed change mechanism 3, and the second fan blade 4 in the indoor unit; second, it is difficult to accurately align the first fan blade 2 and the second fan blade 4 with the reheat and dehumidification parts of the indoor heat exchanger; and third, the misalignment gap between the first fan blade 2 and the second fan blade 4 affects the overall air intake of the indoor unit. When the first rotating shaft 31 is connected to the first bevel gear 33 via the first transmission assembly, and the second rotating shaft 32 is connected to the second bevel gear 34 via the second transmission assembly, the first and second transmission assemblies can be used to change the relative position between the first rotating shaft 31 and the second rotating shaft 32, so that the axes of the first rotating shaft 31 and the second rotating shaft 32 coincide with each other and do not misalign, thereby preventing misalignment of the first fan blade 2 and the second fan blade 4. This facilitates the installation of the first fan blade 2, the speed change mechanism 3, and the second fan blade 4 in the indoor unit; facilitates accurate alignment of the first fan blade 2 and the second fan blade 4 with the reheating part and the dehumidification part of the indoor heat exchanger; ensures that the first fan blade 2 and the second fan blade 4 do not misalign, thereby ensuring the overall air intake of the indoor unit.

[0039] As a specific embodiment, the transmission ratio generated by the first transmission assembly is the same as the transmission ratio generated by the second transmission assembly. Thus, the first and second transmission assemblies only change the direction of the power, without changing the transmission ratio. The speed changes of the first and second rotating shafts 31, 32 are completely controlled by the two bevel gears, making the speed control of the first and second rotating shafts 31, 32 simpler and more convenient.

[0040] As an embodiment 1, Figures 3 to 5As shown, the first transmission assembly includes a first gear 37 and a second gear 38. The first gear 37 is mounted on the first rotating shaft 31. The first bevel gear 33 has a first insertion portion, and the second gear 38 is mounted on the first insertion portion. The first gear 37 meshes with the second gear 38, and the first bevel gear 33 and the first rotating shaft 31 rotate synchronously through the gear meshing transmission mode. The second transmission assembly includes a third gear 42, a fourth gear 43, a third rotating shaft 44, a fifth gear 45, and a sixth gear 46. The third gear 42 is mounted on the second rotating shaft 32, and the fourth gear 43 and the fifth gear 45 are both mounted on the third rotating shaft 44. The second bevel gear 34 has a second insertion portion, and the sixth gear 46 is mounted on the second insertion portion. The third gear 42 meshes with the fourth gear 43, and the fifth gear 45 meshes with the sixth gear 46. The second bevel gear 34 and the second rotating shaft 32 rotate synchronously through the gear meshing transmission mode.

[0041] It should be noted that in the first embodiment, in order to achieve the same transmission ratio as that produced by the first transmission assembly, the first gear 37 and the third gear 42 preferably have the same specifications, and the second gear 38, the fourth gear 43, the fifth gear 45, and the sixth gear 46 preferably have the same specifications. In order to enable either the first bevel gear 33 or the second bevel gear 34 to move axially of the speed change mechanism 3 to change the transmission ratio between the first bevel gear 33 and the second bevel gear 34, the first bevel gear 33 can be moved axially along the second gear 38 via the first insertion portion, or the second bevel gear 34 can be moved axially along the sixth gear 46 via the second insertion portion. Specifically, the second gear 38 and the first inserting portion can be matched similarly to a keyway, or the first inserting portion can be a square shaft and the second gear 38 has a square hole. When the second gear 38 is mounted on the first inserting portion, the first bevel gear 33 and the second gear 38 can both rotate synchronously and move the first bevel gear 33 along the axial direction of the second gear 38; the sixth gear 46 and the second inserting portion can be matched similarly to a keyway, or the second inserting portion can be a square shaft and the sixth gear 46 has a square hole. When the sixth gear 46 is mounted on the second inserting portion, the second bevel gear 34 and the sixth gear 46 can both rotate synchronously and move the second bevel gear 34 along the axial direction of the sixth gear 46.

[0042] As a second embodiment, Figure 6 and Figure 7As shown, the first transmission assembly includes a first pulley 39, a second pulley 40 and a second transmission belt 41. The first pulley 39 is mounted on the first rotating shaft 31. The first conical pulley 33 has a first plug-in portion. The second pulley 40 is mounted on the first plug-in portion. The first pulley 39 and the second pulley 40 are spaced apart. The second transmission belt 41 is simultaneously mounted on the first pulley 39 and the second pulley 40. The synchronous rotation between the first conical pulley 33 and the first rotating shaft 31 is achieved through the transmission method of the pulley belt. The second transmission assembly includes a third pulley 47, a fourth pulley 48, a third rotating shaft 44, a third transmission belt 49, a fifth pulley 50, a sixth pulley 51 and a fourth transmission belt 52. The third pulley 47 is mounted on the second rotating shaft 32, the fourth pulley 48 and the fifth pulley 50 are both mounted on the third rotating shaft 44, the second conical pulley 34 has a second plug-in portion, the sixth pulley 51 is mounted on the second plug-in portion, the third pulley 47 and the fourth pulley 48 are arranged at intervals, the third transmission belt 49 is simultaneously mounted on the third pulley 47 and the fourth pulley 48, the fifth pulley 50 and the sixth pulley 51 are arranged at intervals, and the fourth transmission belt 52 is simultaneously mounted on the fifth pulley 50 and the sixth pulley 51, and the synchronous rotation between the second conical pulley 34 and the second rotating shaft 32 is achieved through the transmission mode of the pulley belt.

[0043] It should be noted that in the second embodiment, in order to achieve the same transmission ratio generated by the first transmission assembly as that generated by the second transmission assembly, preferably, the first pulley 39 and the third pulley 47 have the same specifications, and the second pulley 40, the fourth pulley 48, the fifth pulley 50, and the sixth pulley 51 have the same specifications. In order to enable either the first bevel pulley 33 or the second bevel pulley 34 to move axially of the speed change mechanism 3 to change the transmission ratio between the first bevel pulley 33 and the second bevel pulley 34, the first bevel pulley 33 can be moved axially along the second pulley 40 via the first insertion portion, or the second bevel pulley 34 can be moved axially along the sixth pulley 51 via the second insertion portion. Specifically, the second pulley 40 and the first plug-in part can be matched similarly to a keyway, or the first plug-in part can be a square shaft and the second pulley 40 has a square hole. When the second pulley 40 is installed on the first plug-in part, the first bevel wheel 33 and the second pulley 40 can not only rotate synchronously, but also the first bevel wheel 33 can move axially along the second pulley 40; the sixth pulley 51 and the second plug-in part can be matched similarly to a keyway, or the second plug-in part can be a square shaft and the sixth pulley 51 has a square hole. When the sixth pulley 51 is installed on the second plug-in part, the second bevel wheel 34 and the sixth pulley 51 can not only rotate synchronously, but also the second bevel wheel 34 can move axially along the sixth pulley 51.

[0044] It should also be noted that a speed sensor 54 is provided at the end of the first bevel gear 33. The speed sensor 54 is used to detect the output speed. The output of the speed sensor 54 is used as feedback to more accurately control the extension and retraction distance of the telescopic member 36, thereby more accurately controlling the output speed of the speed change mechanism 3. The speed change mechanism 3 also includes a housing 53. The first bevel gear 33, the second bevel gear 34, the first drive belt 35, the telescopic member 36, the first transmission assembly, the second transmission assembly, and the speed sensor 54 are all mounted within the housing 53. The first rotating shaft 31 and the second rotating shaft 32 respectively extend through the left and right end walls of the housing 53.

[0045] The present invention also provides an air conditioner including the aforementioned indoor unit. By adding a speed change mechanism 3, the first or second blades 2, 4 can achieve a lower rotational speed, thereby extending the dehumidification limit of the air conditioner. During normal cooling or heating operation, the first and second rotating shafts 31, 32 of the speed change mechanism 3 rotate at the same speed, and the first and second blades 2, 4 rotate at the same speed. Ultimately, the air conditioner of the present application is capable of achieving dual temperature and humidity control.

[0046] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0047] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. An indoor unit, characterized in that: The invention comprises a driving mechanism (1), a first fan blade (2), a speed change mechanism (3) and a second fan blade (4); the speed change mechanism (3) comprises a first rotating shaft (31) and a second rotating shaft (32); the first rotating shaft (31) is connected to the first fan blade (2); the second rotating shaft (32) is connected to the second fan blade (4); the first fan blade (2) and the second fan blade (4) are respectively located on both sides of the speed change mechanism (3); and the driving mechanism (1) is drivingly connected to one of the first fan blade (2) and the second fan blade (4).

2. The indoor unit according to claim 1, characterized in that: The speed change mechanism (3) comprises a first cone wheel (33), a second cone wheel (34) and a first transmission belt (35); the first cone wheel (33) and the second cone wheel (34) are spaced apart; the first transmission belt (35) is simultaneously sleeved on the first cone wheel (33) and the second cone wheel (34); the first rotating shaft (31) is configured to rotate synchronously with the first cone wheel (33); the second rotating shaft is configured to rotate synchronously with the second cone wheel (34); any one of the first cone wheel (33) and the second cone wheel (34) can move along the axial direction of the speed change mechanism (3) to change the relative position relationship between the first transmission belt (35) and the first cone wheel (33) and the second cone wheel (34), thereby changing the transmission ratio between the first cone wheel (33) and the second cone wheel (34).

3. The indoor unit according to claim 2, characterized in that: The speed change mechanism (3) further includes a telescopic component (36), and the telescopic component (36) is connected to one of the first cone wheel (33) and the second cone wheel (34).

4. The indoor unit according to claim 2 or 3, characterized in that: The first rotating shaft (31) is connected to the first cone wheel (33) through a first transmission assembly, the second rotating shaft (32) is connected to the second cone wheel (34) through a second transmission assembly, and the axis of the first rotating shaft (31) coincides with the axis of the second rotating shaft (32).

5. The indoor unit according to claim 4, characterized in that: The transmission ratio produced by the first transmission assembly is the same as the transmission ratio produced by the second transmission assembly.

6. The indoor unit according to claim 4, characterized in that: The first transmission assembly comprises a first gear (37) and a second gear (38), wherein the first gear (37) is mounted on the first rotating shaft (31), the first bevel gear (33) has a first insertion portion, the second gear (38) is mounted on the first insertion portion, and the first gear (37) is meshed with the second gear (38).

7. The indoor unit according to claim 4, characterized in that: The first transmission assembly includes a first pulley (39), a second pulley (40) and a second transmission belt (41), wherein the first pulley (39) is sleeved on the first rotating shaft (31), the first cone wheel (33) has a first insertion portion, the second pulley (40) is sleeved on the first insertion portion, the first pulley (39) and the second pulley (40) are spaced apart, and the second transmission belt (41) is sleeved on the first pulley (39) and the second pulley (40) at the same time.

8. The indoor unit according to claim 6 or 7, characterized in that: When the first transmission assembly includes the second gear (38), after the second gear (38) is mounted on the first insertion portion, the first bevel wheel (33) can move along the axial direction of the second gear (38) through the first insertion portion; when the first transmission assembly includes the second pulley (40), after the second pulley (40) is mounted on the first insertion portion, the first bevel wheel (33) can move along the axial direction of the second pulley (40) through the first insertion portion.

9. The indoor unit according to claim 4, characterized in that: The second transmission assembly comprises a third gear (42), a fourth gear (43), a third rotating shaft (44), a fifth gear (45) and a sixth gear (46); the third gear (42) is mounted on the second rotating shaft (32); the fourth gear (43) and the fifth gear (45) are both mounted on the third rotating shaft (44); the second bevel gear (34) has a second plug-in portion; the sixth gear (46) is mounted on the second plug-in portion; the third gear (42) is meshed with the fourth gear (43); and the fifth gear (45) is meshed with the sixth gear (46).

10. The indoor unit according to claim 4, characterized in that: The second transmission assembly comprises a third pulley (47), a fourth pulley (48), a third rotating shaft (44), a third transmission belt (49), a fifth pulley (50), a sixth pulley (51) and a fourth transmission belt (52), wherein the third pulley (47) is sleeved on the second rotating shaft (32), the fourth pulley (48) and the fifth pulley (50) are both sleeved on the third rotating shaft (44), the second cone wheel (34) has a second plug-in portion, the sixth pulley (51) is sleeved on the second plug-in portion, the third pulley (47) and the fourth pulley (48) are spaced apart, the third transmission belt (49) is simultaneously sleeved on the third pulley (47) and the fourth pulley (48), the fifth pulley (50) and the sixth pulley (51) are spaced apart, and the fourth transmission belt (52) is simultaneously sleeved on the fifth pulley (50) and the sixth pulley (51).

11. The indoor unit according to claim 9 or 10, characterized in that: When the second transmission assembly includes the sixth gear (46), after the sixth gear (46) is mounted on the second insertion portion, the second bevel gear (34) can move along the axial direction of the sixth gear (46) through the second insertion portion; when the second transmission assembly includes the sixth pulley (51), after the sixth pulley (51) is mounted on the second insertion portion, the second bevel gear (34) can move along the axial direction of the sixth pulley (51) through the second insertion portion.

12. An air conditioner, characterized in that: The indoor unit comprises the indoor unit according to any one of claims 1 to 11.

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