Chassis structure, air conditioner indoor unit and air conditioner

Abstract

This invention relates to the field of air conditioning technology and discloses a chassis structure, an indoor air conditioning unit, and an air conditioner. The chassis structure, applied to the indoor air conditioning unit, includes a volute and a front volute tongue. The volute includes a main body and a rear volute tongue connected to the inner end of the main body. The front volute tongue is located on the front side of the volute and forms an air duct with the volute, which is used to install the impeller of the indoor air conditioning unit. The rear volute tongue has a first side facing the impeller and a second side opposite to the first side. Multiple air passage slots are formed at the end of the rear volute tongue furthest from the main body, arranged along the length of the rear volute tongue with their openings facing away from the main body. These air passage slots connect the first and second sides and are used at least to allow airflow from the second side to the first side. The chassis structure provided by this invention, by providing air passage slots on the rear volute tongue, significantly reduces the generation of abnormal noises such as whistling, while improving the efficiency of airflow entering the air duct and enhancing the overall aerodynamic efficiency of the air duct.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a chassis structure, an indoor air conditioning unit, and an air conditioner. Background Technology

[0002] Most existing wall-mounted air conditioners use a cross-flow duct structure for air delivery, and the cross-flow duct is defined by the relatively arranged volute and front volute tongue. The impeller is installed in the cross-flow duct. After the airflow enters the duct from the air inlet through the evaporator, it is guided by the rotation of the impeller and flows out from the air outlet.

[0003] At the rear volute end of the volute, the airflow is unstable due to the large turning angle of the airflow. Furthermore, the rear volute is close to the impeller and has a higher air pressure. When the impeller rotates and does work on the airflow, some of the airflow entering through the evaporator and the airflow guided by the impeller's rotation intersect, which can easily generate abnormal noises such as whistling in the vicinity. At the same time, the instability of the airflow will also cause air volume loss, thereby reducing the overall aerodynamic efficiency of the machine. Summary of the Invention

[0004] The first objective of this invention is to provide a chassis structure that aims to solve the technical problems of abnormal noise and low aerodynamic efficiency in air conditioners in the related art.

[0005] To achieve the above objectives, the present invention provides a chassis structure for use in an air conditioner indoor unit, comprising:

[0006] A volute, the volute comprising a main body and a posterior volute tongue connected to the inner end of the main body;

[0007] The front volute tongue is located on the front side of the volute and forms an air duct with the volute. The air duct is used to install the fan wheel of the indoor unit of the air conditioner.

[0008] The rear volute tongue has a first side facing the impeller and a second side opposite to the first side. The end of the rear volute tongue away from the shell body has a plurality of air passage slots arranged along the length of the rear volute tongue and with the slot openings facing away from the shell body. The air passage slots connect the first side and the second side and are at least used to allow airflow from the second side to the first side.

[0009] As one implementation, the air duct shall satisfy at least one of the following conditions:

[0010] The width of the air passage is greater than or equal to 2 mm and less than or equal to 10 mm, wherein the width direction of the air passage is in the same direction as the length direction of the rear volute tongue;

[0011] The depth of the air duct is greater than or equal to 3 mm and less than or equal to 10 mm;

[0012] The distance between two adjacent air ducts is greater than 0 mm and less than or equal to 15 mm.

[0013] In one embodiment, the width of the air duct is greater than or equal to 4 mm and less than or equal to 6 mm;

[0014] The depth of the air duct is greater than or equal to 6 mm and less than or equal to 8 mm;

[0015] The distance between two adjacent air ducts is greater than 0 mm and less than or equal to 8 mm.

[0016] In one implementation, the width of the air passage groove is the largest at the opening, wherein the width direction of the air passage groove is in the same direction as the length direction of the rear volute tongue.

[0017] In one implementation, all the described air ducts have the same shape; or,

[0018] At least one of the air ducts has a different shape than the other air ducts; or,

[0019] All of the described air ducts have different shapes.

[0020] In one implementation, the air duct is triangular, trapezoidal, arc-shaped, U-shaped, or parallelogram-shaped.

[0021] In one embodiment, the wall of the air duct is a smooth surface; or,

[0022] The wall of the air duct has an uneven surface; or,

[0023] The wall of the air duct is partly smooth and partly uneven.

[0024] In one embodiment, the plurality of air passages are arranged at equal intervals along the length direction of the rear volute tongue.

[0025] A second objective of the present invention is to provide an indoor air conditioning unit, comprising a fan impeller and the aforementioned chassis structure, wherein the fan impeller is located within the air duct of the chassis structure.

[0026] A third objective of the present invention is to provide an air conditioner, comprising an outdoor unit and an indoor unit as described above, wherein the outdoor unit is connected to the indoor unit.

[0027] The chassis structure, indoor air conditioning unit, and air conditioner provided by this invention, by setting multiple air passage slots arranged along the length of the rear volute tongue with their openings facing away from the main body, make the end of the rear volute tongue away from the main body recessed, no longer exhibiting overall continuity; and by setting air passage slots to connect the first side and the second side, so that airflow can at least flow from the second side to the first side, and make the end of the rear volute tongue away from the main body exhibit a sawtooth or wave-like structure. When the airflow entering from the air inlet and the airflow guided by the rotating impeller meet at the rear volute tongue... When the ends of the tongues, furthest from the shell body, meet, no abnormal noises such as whistling will be generated because the meeting areas are at the same height. Instead, some of them meet at the height of the air passage, while others meet at the height of the end of the rear volute tongue furthest from the shell body. By forming meeting areas at different heights, the frequency of the airflow entering the air duct is dispersed, thereby avoiding the generation of abnormal noises of similar frequencies. In addition, by setting multiple air passages, the air intake space here can be increased, making the airflow more stable, thereby improving the air intake efficiency and enhancing the aerodynamic efficiency of the entire air duct. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the indoor unit of the air conditioner provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is a cross-sectional view of the indoor unit of the air conditioner provided in Embodiment 1 of the present invention;

[0031] Figure 3 This is a schematic diagram of the chassis structure and wind turbine assembly structure provided in Embodiment 1 of the present invention;

[0032] Figure 4 This is a schematic diagram of the chassis structure provided in Embodiment 1 of the present invention from one perspective;

[0033] Figure 5 yes Figure 4 A magnified view of a section at point A in the middle;

[0034] Figure 6 This is a schematic diagram of the chassis structure provided in Embodiment 1 of the present invention from another perspective;

[0035] Figure 7 yes Figure 6 A magnified view of a section at point B in the middle;

[0036] Figure 8 This is a curve showing the correlation between the width of the air passage groove provided in Embodiment 1 of the present invention and noise.

[0037] Figure 9 This is a curve showing the correlation between the depth of the air passage groove in the posterior cochlear tongue provided in Embodiment 1 of the present invention and noise.

[0038] Figure 10 This is a graph showing the correlation between the air passage grooves and noise levels in the rear volute tongue provided in Embodiment 1 of the present invention.

[0039] Figure 11 This is a partially enlarged view of the posterior cochlear tongue provided in Embodiment 2 of the present invention;

[0040] Figure 12 This is a partially enlarged view of the posterior cochlear tongue provided in Embodiment 3 of the present invention;

[0041] Figure 13 This is a partially enlarged view of the posterior cochlear tongue provided in Embodiment 4 of the present invention;

[0042] Figure 14 This is a partially enlarged view of the posterior cochlear tongue provided in Embodiment 5 of the present invention;

[0043] Figure 15 This is a partially enlarged view of the cochlear tongue provided in Embodiment Six of the present invention.

[0044] Explanation of icon numbers:

[0045] 100. Chassis structure; 10. Volute; 11. Shell body; 12. Rear volute tongue; 121. First side; 122. Second side; 13. Air passage; 131. Slot opening; 132. First opening; 133. Second opening; 134. Slot wall; 135. Flow channel; 20. Front volute tongue; 30. Air duct; 31. Air inlet; 32. Air outlet; 200. Fan wheel; 300. Evaporator.

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0049] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0050] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0051] Most existing wall-mounted air conditioners use a cross-flow duct formed by a relatively arranged volute and a front volute tongue to deliver air. At the rear volute tongue end of the volute, the airflow is unstable due to the large turning angle. In addition, the rear volute tongue is close to the impeller and has a higher air pressure. When the impeller rotates in the cross-flow duct and does work on the airflow, part of the airflow entering through the evaporator and the airflow guided by the rotating impeller intersect, which can easily produce abnormal noises such as whistling in this area. At the same time, the airflow instability will also cause air volume loss, thereby reducing the aerodynamic efficiency of the whole unit.

[0052] In view of this, the present invention provides a chassis structure, an indoor air conditioning unit, and an air conditioner. The air conditioner includes an indoor air conditioner and an outdoor air conditioner connected to the indoor air conditioner. The indoor air conditioner includes a chassis structure and a fan wheel installed in the chassis structure.

[0053] like Figures 1 to 3 As shown, the chassis structure 100 provided in this embodiment of the invention is applied to an indoor air conditioner unit, including a volute 10 and a front volute tongue 20. The front volute tongue 20 is located on the front side of the volute 10 and forms an air duct 30 with the volute 10. The air duct 30 is used to install the impeller 200 of the indoor air conditioner unit. In specific applications, the air duct 30 has an air inlet 31 and an air outlet 32. Airflow enters the air duct 30 from the air inlet 31, and the impeller 200 rotates to do work on the airflow, causing the airflow to be discharged from the air outlet 32. Figure 2The arrows in the diagram indicate the direction of airflow. The "front" refers to the side of the chassis structure 100 furthest from the wall when the indoor unit is mounted.

[0054] As one implementation method, refer to Figure 2 , Figure 4 and Figure 5 As shown, the volute 10 includes a shell body 11 and a rear volute tongue 12 connected to the inner end of the shell body 11; wherein, the rear volute tongue 12 has a first side portion 121 disposed toward the impeller 200 and a second side portion 122 disposed opposite to the first side portion 121, and a plurality of air passage slots 13 are formed at the end of the rear volute tongue 12 away from the shell body 11, which are arranged along the length direction of the rear volute tongue 12 and have slots 131 disposed opposite to the shell body 11, and the air passage slots 13 connect the first side portion 121 and the second side portion 122, and the air passage slots 13 are at least used to allow airflow from the second side portion 122 to the first side portion 121. In specific applications, the air duct 13 also includes a first opening 132 and a second opening 133 connecting the duct body. The first opening 132 is located on the first side 121, and the second opening 133 is located on the second side 122, so that the air duct 13 connects the first side 121 and the second side 122, thereby allowing airflow to enter the duct body from one of the first opening 132 and the second opening 133, and flow out from the other. The length direction of the rear volute tongue 12 is the same as the length direction of the indoor unit of the air conditioner, that is... Figure 1 The left and right directions are shown.

[0055] By adopting the above technical solution, by setting multiple air passage slots 13 arranged along the length of the rear volute tongue 12 with the slots 131 facing away from the shell body 11, the end of the rear volute tongue 12 away from the shell body 11 is recessed and no longer presents an overall continuity; and by setting the air passage slots 13 to connect the first side 121 and the second side 122, so that the airflow can at least flow from the second side 122 to the first side 121, and the end of the rear volute tongue 12 away from the shell body 11 presents a sawtooth or wave-like structure. When the airflow entering from the air inlet 31 and the air guided by the rotation of the impeller 200 are combined, the airflow can be directed to the shell body 11. When the airflows converge at the end of the rear volute tongue 12 furthest from the shell body 11, no whistling or other abnormal noises are generated because the converging areas are at the same height. Instead, some converge at the height of the air passage 13, and others converge at the height of the end of the rear volute tongue 12 furthest from the shell body 11. By forming converging areas at different heights, the frequency of the airflow entering the air duct 30 is dispersed, thereby avoiding the generation of abnormal noises of similar frequencies. In addition, by setting multiple air passages 13, the air intake space at this location can be increased, making the airflow more stable, thereby improving the air intake efficiency and enhancing the aerodynamic efficiency of the entire air duct 30. Therefore, the chassis structure 100 provided by the present invention greatly reduces the generation of whistling and other abnormal noises, while improving the efficiency of airflow entering the air duct 30 and enhancing the aerodynamic efficiency of the entire air duct 30.

[0056] As one implementation method, refer to Figure 6 and Figure 7 As shown, the air passage 13 shall satisfy at least one of the following conditions: the width W of the air passage 13 is greater than or equal to 2 mm and less than or equal to 10 mm; the depth H of the air passage 13 is greater than or equal to 3 mm and less than or equal to 10 mm; the distance L between two adjacent air passages 13 is greater than 0 mm and less than or equal to 15 mm; wherein, the width direction of the air passage 13 is in the same direction as the length direction of the rear volute tongue 12; in addition, when the shape of the air passage 13 is irregular, its width refers to the maximum width of the air passage 13. Figure 8 The graph shows the correlation between the width of the air duct 13 and the noise level. It can be seen from the graph that when the width W of the air duct 13 is greater than or equal to 2 mm and less than or equal to 10 mm, the noise level is significantly lower than that of other sizes. Figure 9 The graph shows the correlation between the depth of the air duct 13 and the noise level. It can be seen from the graph that when the depth H of the air duct 13 is greater than or equal to 3 mm and less than or equal to 10 mm, the noise level is significantly lower than that of other sizes. Figure 10 The graph shows the correlation between the distance between two adjacent air ducts 13 and the noise. It can be seen from the graph that when the distance L between two adjacent air ducts 13 is greater than 0 mm and less than or equal to 15 mm, the noise is significantly lower than that of other sizes.

[0057] In specific applications, the width W of the air passage 13 can be 2mm, 3mm, 5mm, 7mm, 8mm, 9mm, or 10mm. All air passage 13 can have the same width, some can have the same width and some can have different widths, or all air passage 13 can have different widths. The depth H of the air passage 13 can be 3mm, 5mm, 6mm, 8mm, 9mm, or 10mm. All air passage 13 can have the same depth, some can have the same depth and some can have different depths, or all air passage 13 can have different depths. The distance L between two adjacent air passage 13 can be 1mm, 3mm, 5mm, 7mm, 10mm, 12mm, 14mm, or 15mm. Any two adjacent air passage 13 can have the same distance, meaning multiple air passage 13 are arranged at equal intervals along the length of the rear volute tongue 12. Alternatively, some air passage 13 can have the same distance and some can have different distances, or any two adjacent air passage 13 can have different distances.

[0058] In one implementation, the width W of the air duct 13 is preferably greater than or equal to 4 mm and less than or equal to 6 mm, the depth H of the air duct 13 is preferably greater than or equal to 6 mm and less than or equal to 8 mm, and the distance L between two adjacent air ducts 13 is preferably greater than 0 mm and less than or equal to 8 mm. This results in lower noise, better quietness, and further improves the user's experience with the product.

[0059] In one implementation, the width is greatest at the opening 131 of the air duct 13. That is, the width of the opening 131 of the air duct 13 is greater than other parts of the air duct 13, and the air duct 13 is flared out, causing airflow between adjacent air ducts 13 to interfere with each other, which helps to break resonance and eliminate whistling. Of course, in specific applications, alternative implementation schemes can be used...

[0060] In one implementation, all air passage slots 13 have the same shape; this is beneficial for manufacturing. Of course, in specific applications, as an alternative implementation, it is also possible for at least one air passage slot 13 to have a different shape from the other air passage slots 13, or for all air passage slots 13 to have different shapes.

[0061] As one implementation method, refer to Figure 7 As shown, the air duct 13 is triangular. In this embodiment, the air duct 13 is an isosceles triangle. It is understood that in other embodiments, the air duct 13 can also be an equilateral or scalene triangle. It should be noted that the shape of the air duct 13 is not limited to this and can be designed accordingly based on requirements.

[0062] In one embodiment, the walls 134 of the air duct 13 are smooth surfaces. In this embodiment, the triangular air duct 13 has two walls 134, both of which are smoothly arranged.

[0063] Furthermore, referring to Figures 1 to 3 As shown, the present invention also provides an indoor air conditioning unit, including a fan wheel 200 and the aforementioned chassis structure 100, wherein the fan wheel 200 is located within the air duct 30 of the chassis structure 100. By adopting the aforementioned chassis structure 100, the generation of abnormal noises such as whistling is greatly reduced, making it more comfortable and quiet to use; and at the same time, the efficiency of airflow entering the air duct 30 is improved, effectively enhancing the aerodynamic efficiency of the entire air duct 30.

[0064] As one implementation method, refer to Figure 2 As shown, the indoor unit of the air conditioner also includes an evaporator 300, which is located on the air inlet side of the impeller 200. In practical applications, the airflow enters from the air inlet 31, passes through the evaporator 300, and is then discharged from the air outlet 32 ​​under the action of the impeller 200.

[0065] Furthermore, this embodiment of the invention also provides an air conditioner, including an outdoor unit and the aforementioned indoor unit, wherein the outdoor unit and the indoor unit are connected. Specifically, the outdoor unit is installed outdoors, the indoor unit is installed indoors, the outdoor unit and the indoor unit are connected via refrigerant pipes, and the indoor unit and the outdoor unit exchange heat via refrigerant.

[0066] Example 2:

[0067] Reference Figure 6 , Figure 7 and Figure 11 As shown, the chassis structure 100, air conditioning indoor unit and air conditioner provided in this embodiment are different from those in embodiment one mainly in the shape of the air passage 13. Specifically, in embodiment one, the air passage 13 is triangular; while in this embodiment, the air passage 13 is trapezoidal.

[0068] In one implementation, the air duct 13 is an isosceles trapezoid. Of course, in specific applications, the air duct 13 can also be a trapezoid of other shapes, such as a right trapezoid.

[0069] Apart from the differences mentioned above, the chassis structure 100, the indoor air conditioning unit, and other parts of the air conditioner provided in this embodiment can be set up in accordance with the corresponding configuration in Embodiment 1, and will not be described in detail here.

[0070] Example 3:

[0071] Reference Figure 6 , Figure 7 and Figure 12 As shown, the chassis structure 100, air conditioning indoor unit and air conditioner provided in this embodiment are different from those in embodiment one mainly in the shape of the air passage 13. Specifically, in embodiment one, the air passage 13 is triangular; while in this embodiment, the air passage 13 is arc-shaped.

[0072] In one implementation, the air duct 13 is arc-shaped with a central angle of 180°. Of course, in specific applications, the air duct 13 can also be arc-shaped in other ways, and this is not a limitation.

[0073] Apart from the differences mentioned above, the chassis structure 100, the indoor air conditioning unit, and other parts of the air conditioner provided in this embodiment can be set up in accordance with the corresponding configuration in Embodiment 1, and will not be described in detail here.

[0074] Example 4:

[0075] Reference Figure 6 , Figure 7 and Figure 13As shown, the chassis structure 100, air conditioning indoor unit and air conditioner provided in this embodiment are different from those in embodiment one mainly in the shape of the air passage 13. Specifically, in embodiment one, the air passage 13 is triangular; while in this embodiment, the air passage 13 is U-shaped.

[0076] Apart from the differences mentioned above, the chassis structure 100, the indoor air conditioning unit, and other parts of the air conditioner provided in this embodiment can be set up in accordance with the corresponding configuration in Embodiment 1, and will not be described in detail here.

[0077] Example 5:

[0078] Reference Figure 6 , Figure 7 and Figure 14 As shown, the chassis structure 100, air conditioning indoor unit and air conditioner provided in this embodiment are different from those in embodiment one mainly in the shape of the air passage 13. Specifically, in embodiment one, the air passage 13 is triangular; while in this embodiment, the air passage 13 is parallelogram.

[0079] In one implementation, the air duct 13 is rectangular. A rectangle is a special type of parallelogram. Of course, in specific applications, the air duct 13 can also be a non-special parallelogram.

[0080] Apart from the differences mentioned above, the chassis structure 100, the indoor air conditioning unit, and other parts of the air conditioner provided in this embodiment can be set up in accordance with the corresponding configuration in Embodiment 1, and will not be described in detail here.

[0081] Example 6:

[0082] Reference Figure 6 , Figure 7 and Figure 15 As shown, the chassis structure 100, air conditioner indoor unit and air conditioner provided in this embodiment are different from those in embodiments one to five mainly in the structure of the channel wall 134 of the air passage 13. Specifically, in embodiments one to five, the wall of the air passage 13 is a smooth surface; while in this embodiment, the channel wall 134 of the air passage 13 is a concave-convex surface.

[0083] As one implementation method, refer to Figure 5 and Figure 15 As shown, the wall 134 of the air duct 13 has multiple flow channels 135 connecting the first side 121 and the second side 122. This arrangement increases the air intake space. In this embodiment, multiple flow channels 135 are provided to make the wall 134 form a concave-convex surface. It can be understood that in other embodiments, the wall 134 can be made to form a concave-convex surface in other ways, such as by providing multiple protrusions on the wall 134.

[0084] Apart from the differences mentioned above, the chassis structure 100, the indoor air conditioning unit, and other parts of the air conditioner provided in this embodiment can be set up with reference to Embodiments 1 to 5, and will not be described in detail here.

[0085] Example 7:

[0086] The chassis structure 100, air conditioner indoor unit and air conditioner provided in this embodiment are different from those in embodiments one to five. The main difference is that the structure of the channel wall 134 of the air passage 13 is different. Specifically, in embodiments one to five, the wall of the air passage 13 is a smooth surface; while in this embodiment, the channel wall 134 of the air passage 13 is partly a smooth surface and partly a concave-convex surface.

[0087] Apart from the differences mentioned above, the chassis structure 100, the indoor air conditioning unit, and other parts of the air conditioner provided in this embodiment can be set up with reference to Embodiments 1 to 5, and will not be described in detail here.

[0088] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A chassis structure for use in an air conditioner indoor unit, characterized in that, include: A volute, the volute comprising a main body and a posterior volute tongue connected to the inner end of the main body; The front volute tongue is located on the front side of the volute and forms an air duct with the volute. The air duct is used to install the fan wheel of the indoor unit of the air conditioner. The rear volute tongue has a first side facing the impeller and a second side opposite to the first side. The end of the rear volute tongue away from the shell body has a plurality of air passage slots arranged along the length of the rear volute tongue and with the slot openings facing away from the shell body. The air passage slots connect the first side and the second side and are at least used to allow airflow from the second side to the first side.

2. The chassis structure as described in claim 1, characterized in that, The air duct must satisfy at least one of the following conditions: The width of the air passage is greater than or equal to 2 mm and less than or equal to 10 mm, wherein the width direction of the air passage is in the same direction as the length direction of the rear volute tongue; The depth of the air duct is greater than or equal to 3 mm and less than or equal to 10 mm; The distance between two adjacent air ducts is greater than 0 mm and less than or equal to 15 mm.

3. The chassis structure as described in claim 2, characterized in that, The width of the air duct is greater than or equal to 4 mm and less than or equal to 6 mm; The depth of the air duct is greater than or equal to 6 mm and less than or equal to 8 mm; The distance between two adjacent air ducts is greater than 0 mm and less than or equal to 8 mm.

4. The chassis structure as described in claim 1, characterized in that, The width of the air passage is greatest at the opening of the passage, and the width direction of the air passage is in the same direction as the length direction of the rear volute tongue.

5. The chassis structure as described in claim 1, characterized in that, All of the described air ducts have the same shape; or... At least one of the air ducts has a different shape than the other air ducts; or, All of the described air ducts have different shapes.

6. The chassis structure as described in claim 1, characterized in that, The air duct is triangular, trapezoidal, arc-shaped, "U"-shaped, or parallelogram-shaped.

7. The chassis structure as described in claim 1, characterized in that, The walls of the air duct are smooth; or, The wall of the air duct has an uneven surface; or, The wall of the air duct is partly smooth and partly uneven.

8. The chassis structure as described in any one of claims 1 to 7, characterized in that, The multiple air passages are arranged at equal intervals along the length of the rear volute tongue.

9. An indoor unit for an air conditioner, characterized in that, It includes a wind turbine and a chassis structure as described in any one of claims 1 to 8, wherein the wind turbine is located within the air duct of the chassis structure.

10. An air conditioner, characterized in that, It includes an outdoor air conditioning unit and an indoor air conditioning unit as described in claim 9, wherein the outdoor air conditioning unit is connected to the indoor air conditioning unit.

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