Air duct assembly, indoor unit and heating and ventilation equipment

Abstract

The utility model provides an air duct assembly, an indoor unit and heating and ventilation equipment. The air duct assembly comprises a water pan and a volute tongue structure, the water pan and the volute tongue structure form part of the inner wall of an air duct, and the volute tongue structure comprises a first volute tongue and a second volute tongue; the first volute tongue is connected with the water pan, and the second volute tongue is connected with the first volute tongue and / or the water pan; the first volute tongue and the second volute tongue are arranged in a split mode. The water pan and the volute tongue structure in the indoor unit are low in process difficulty in the manufacturing and forming process.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an air duct assembly, an indoor unit using the air duct assembly, and a heating and ventilation device using the indoor unit. Background Art

[0002] Embedded indoor units generally refer to indoor units installed on the ceiling, and ceiling units are more commonly used in taller buildings.

[0003] In the related art, the embedded indoor unit generally includes a shell, a fan, a heat exchanger and a water collecting pan. An installation cavity is formed in the shell. The fan and the heat exchanger are arranged side by side in the installation cavity. The water collecting pan is arranged below the heat exchanger. Generally, in order to reduce noise and increase air volume, a volute tongue is provided on the side of the water collecting pan close to the fan, and the volute tongue is integrally formed with the water collecting pan.

[0004] However, in the above-mentioned embedded indoor unit, since the size of the water receiving tray is relatively large, the process of integrally forming the water receiving tray and the volute tongue is relatively difficult. Utility Model Content

[0005] The embodiments of the present application provide an air duct assembly, an indoor unit and HVAC equipment, which are used to solve the problem of the difficulty of the integrated molding process between the water receiving tray and the volute tongue in the related art.

[0006] In a first aspect, the present application provides an air duct assembly, comprising a water receiving tray and a volute tongue structure, wherein the water receiving tray and the volute tongue structure form part of the inner wall of the air duct, and the volute tongue structure comprises a first volute tongue and a second volute tongue; the first volute tongue is connected to the water receiving tray, and the second volute tongue is connected to the first volute tongue and / or the water receiving tray; wherein the first volute tongue and the second volute tongue are arranged separately.

[0007] As an optional embodiment, the first volute tongue and the second volute tongue are buckled together along the extension direction of the air duct; wherein the first volute tongue and the water receiving tray are an integral structure, and the second volute tongue and the water receiving tray are detachably connected; or, the first volute tongue and the water receiving tray are detachably connected, and the second volute tongue and the water receiving tray are an integral structure.

[0008] As an optional embodiment, the air duct assembly provided in the present application also includes a plurality of guide ribs, which are protruded from the surface of the snail tongue structure at intervals along the length direction of the snail tongue structure; each guide rib includes a first guide section and a second guide section spliced ​​together, the first guide section is formed on the surface of the first snail tongue, and the second guide section is formed on the surface of the second snail tongue.

[0009] As an optional embodiment, the first volute tongue and the second volute tongue are buckled together in the up-down direction; wherein the first volute tongue and the water receiving tray are an integral structure, and the second volute tongue is detachably connected to the first volute tongue; or, the first volute tongue is detachably connected to the water receiving tray, and the second volute tongue is detachably connected to the first volute tongue. In this way, the first volute tongue can be used as a connection carrier, and when the water receiving tray and the second volute tongue are manufactured and formed, it is convenient to determine the size of the water receiving tray and the second volute tongue.

[0010] As an optional embodiment, it also includes a plurality of guide ribs, which are protruded on the surface of the second volute tongue at intervals along the length direction of the volute tongue structure.

[0011] In the above scheme, by setting a plurality of guide ribs, when the wind flow blown out by the fan flows through the volute tongue structure, part of the wind flow is allowed to flow between two adjacent guide ribs, so that the wind flow with noise will be separated, so that the energy of the noise can be weakened, so that the noise can be effectively reduced, and thus the performance of the HVAC equipment is better. In addition, the plurality of guide ribs are arranged at intervals along the length direction of the volute tongue structure, so that under the guiding effect of the plurality of guide ribs, the flow of the wind flow in the length direction of the volute tongue structure can be reduced, that is, the flow of the wind flow in the axial direction of the fan can be reduced, thereby reducing the energy loss of the wind flow in the process of flowing to the air outlet.

[0012] As an optional embodiment, a stopper structure is provided between the first volute tongue and the second volute tongue, and the stopper structure is used to limit the relative position between the first volute tongue and the second volute tongue. In this way, by providing the stopper structure, the relative position between the first volute tongue and the second volute tongue can be limited, thereby improving the assembly efficiency of the first volute tongue and the second volute tongue connected together.

[0013] As an optional embodiment, the first volute tongue has two first guide walls arranged opposite to each other, and a first stop groove is formed on the side of each first guide wall facing the other first guide wall, so as to form a first stop protrusion beside the first stop groove; the second volute tongue has two second guide walls arranged opposite to each other, and a second stop groove is formed on the side of each second guide wall facing away from the other second guide wall, so as to form a second stop protrusion beside the second stop groove; wherein, the stop structure includes a first stop protrusion and a second stop protrusion, and the first stop protrusion extends into the second stop groove, and the second stop protrusion extends into the first stop groove. In this way, through the cooperation between the first stop protrusion and the second stop groove and the cooperation between the second stop protrusion and the first stop groove, the relative position between the first volute tongue and the second volute tongue can be limited, so that the assembly efficiency between the first volute tongue and the second volute tongue is higher.

[0014] As an optional embodiment, the first volute tongue has two oppositely arranged first guide walls, and a first stop groove is formed on the side of one first guide wall facing the other first guide wall to form a first stop protrusion beside the first stop groove; the second volute tongue has two oppositely arranged second guide walls, and a second stop groove is formed on the side of each second guide wall facing away from the other second guide wall to form a second stop protrusion beside the second stop groove; wherein, on one side of the volute tongue structure, the stop structure includes a first stop protrusion and a second stop protrusion, and the first stop protrusion extends into the second stop groove, and the second stop protrusion extends into the first stop groove; on the other side of the volute tongue structure, the stop structure includes a second stop protrusion, and the end of the first guide wall extends into the second stop groove.

[0015] As an optional implementation, the second volute tongue is detachably connected to the water receiving tray via a fastener.

[0016] As an optional embodiment, a limiting structure is provided between the second volute tongue and the water receiving tray, and the limiting structure is used to limit the relative position of the second volute tongue and the water receiving tray. In this way, the position of the second volute tongue and the tray body can be limited by the limiting structure first, and then the second volute tongue and the tray body are connected by a fastener, so that the second volute tongue is installed on the water receiving tray more efficiently.

[0017] As an optional embodiment, the limiting structure includes a limiting protrusion; the limiting protrusion is arranged on one of the second volute tongue and the water receiving tray, and the other of the second volute tongue and the water receiving tray is provided with a limiting hole for the protrusion to be inserted. In this way, the relative position between the second volute tongue and the tray body can be limited by the plug-in cooperation between the limiting protrusion and the limiting hole. Before the second volute tongue and the water receiving tray are connected by the fastener, the second volute tongue and the water receiving tray can be positioned first by the cooperation between the second volute tongue and the tray body, so that the assembly efficiency of the second volute tongue can be improved.

[0018] As an optional implementation, a return channel is formed between the volute tongue structure and the water receiving tray, or a return channel is formed on the volute tongue structure; the return channel is used to guide part of the airflow on the air outlet side of the fan to the air inlet side of the fan. In this way, through the formation of the return channel, a certain air replenishment effect can be achieved, and the utilization efficiency of the airflow can be improved, so as to improve the performance of the indoor unit.

[0019] As an optional embodiment, a reflux channel is formed between the volute tongue structure and the water receiving tray; the reflux channel has a first wall and a second wall that are relatively arranged, the first wall is formed by a portion of the side wall of the water receiving tray, and the second wall is formed by a first guide wall and a second guide wall.

[0020] As an optional implementation, a support structure is provided between the first volute tongue and / or the second volute tongue and the water receiving tray, and the height of the support structure matches that of the limiting structure to jointly define the height of the reflux channel.

[0021] As an optional embodiment, the support structure is arranged between the first volute tongue and the water receiving tray, and the support structure includes a plurality of support ribs arranged at intervals along the length direction of the volute tongue structure. In this way, a certain gap can exist between the first volute tongue and the top wall of the tray body to form a reflux channel, and by providing a plurality of support ribs, the height of the reflux channel in the length direction of the volute tongue structure can be relatively uniform, which can improve the air replenishment effect of the reflux channel.

[0022] As an optional embodiment, the first volute tongue and the second volute tongue are buckled together to form a cavity. In this way, a part of the side wall of the cavity is formed by the side wall of the first volute tongue, and another part of the side wall of the cavity is formed by the side wall of the second volute tongue, that is, the interior of the volute tongue structure is hollow. When the first volute tongue and the second volute tongue are buckled together to form the cavity, the mass of the first volute tongue and the second volute tongue themselves is reduced, so that it is more convenient to form the first volute tongue and the water receiving tray as one piece or to install the second volute tongue on the first volute tongue, thereby making the assembly efficiency between the volute tongue structure and the water receiving tray higher.

[0023] As an optional embodiment, a first reinforcing rib is provided on the side of the first volute tongue facing the second volute tongue, and the shape of the first reinforcing rib is consistent with the contour shape of the first volute tongue; and / or a second reinforcing rib is provided on the side of the second volute tongue facing the first volute tongue, and the shape of the second reinforcing rib is consistent with the contour shape of the second volute tongue. In this way, by providing the first reinforcing rib on the first volute tongue and the second reinforcing rib on the second volute tongue, the structural strength of the volute tongue structure can be improved.

[0024] As an optional embodiment, a plurality of concave cavities are formed on the outer side of the second volute tongue and are spaced apart along the length direction of the volute tongue structure. Thus, the arrangement of the concave cavities facilitates the demoulding of the mold for producing the second volute tongue, thereby improving the processing efficiency of the second volute tongue.

[0025] In a second aspect, the present application provides an indoor unit, comprising a fan, a heat exchanger and the above-mentioned air duct assembly; the fan and the heat exchanger are both arranged in the air duct and are spaced apart on the flow path of the airflow, the heat exchanger is located above the water receiving tray, and the fan is arranged adjacent to the volute tongue structure.

[0026] As an optional embodiment, the indoor unit provided in the present application also includes a panel and a casing, the bottom of the casing is open, and the panel cover is arranged at the opening; the panel has a return air inlet and an air outlet connected to the air duct and arranged at intervals, the return air inlet is arranged adjacent to the heat exchanger, and the air outlet is arranged adjacent to the fan.

[0027] In a third aspect, the present application provides a HVAC device, including the above-mentioned indoor unit.

[0028] In the air duct assembly, indoor unit and HVAC equipment provided by the embodiment of the present application, the air duct assembly includes a water receiving tray and a volute tongue structure, and the volute tongue structure includes a first volute tongue and a second volute tongue; the first volute tongue is connected to the water receiving tray, and the second volute tongue is connected to the first volute tongue and / or the water receiving tray, wherein the first volute tongue and the second volute tongue are separately arranged. In this way, regardless of whether the first volute tongue and the water receiving tray are integrally formed or separately formed, when the first volute tongue and the second volute tongue are a split structure, the second volute tongue can be manufactured separately, and then connected to the first volute tongue and / or the water receiving tray after manufacturing. Compared with the method of integrally forming the water receiving tray and the volute tongue in the related art, such a manufacturing process can reduce the process difficulty when manufacturing the water receiving tray and the volute tongue structure, thereby improving the assembly efficiency of the indoor unit provided by this embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A cross-sectional view of an indoor unit provided in an embodiment of the present application;

[0031] Figure 2 A schematic plan view of a partial structure of an indoor unit provided in an embodiment of the present application;

[0032] Figure 3 for Figure 2 Cross-sectional view along AA direction;

[0033] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at B in the middle;

[0034] Figure 5 for Figure 2 A schematic diagram of a three-dimensional structure from another viewing angle;

[0035] Figure 6 for Figure 5 A magnified schematic diagram of the local structure at C in the middle;

[0036] Figure 7 for Figure 2 Cross-sectional view along DD direction;

[0037] Figure 8 for Figure 7A magnified schematic diagram of the local structure at E in the middle;

[0038] Fig. 9 for Figure 2 Schematic diagram of the three-dimensional structure from another perspective;

[0039] Fig.10 for Fig. 9 A magnified schematic diagram of the local structure at F in the middle;

[0040] Fig.11 A schematic diagram of the three-dimensional structure of the water receiving tray and the first volute tongue in the indoor unit provided in an embodiment of the present application after being connected;

[0041] Fig.12 for Fig.11 A magnified schematic diagram of the local structure at G in the middle;

[0042] Fig.13 A schematic diagram of the three-dimensional structure of the second volute tongue in the indoor unit provided in an embodiment of the present application;

[0043] Fig.14 for Fig. 9 Schematic diagram of the structure from another perspective;

[0044] Fig.15 for Fig.14 A magnified schematic diagram of the local structure at H in the middle;

[0045] Fig.16 for Fig.13 A magnified schematic diagram of the local structure at position I in the middle;

[0046] Fig.17 for Fig.13 Enlarged schematic diagram of the local structure at J in the middle.

[0047] Description of reference numerals:

[0048] 1. Shell; 2. Fan; 3. Heat exchanger; 4. Fasteners; 5. Limiting structure; 6. Support ribs; 7. Guide ribs;

[0049] 11. housing; 12. air duct; 13. return air outlet; 14. air outlet; 15. water tray; 16. volute tongue structure; 17. return flow channel; 51. limiting protrusion; 52. limiting hole; 71. first guide section; 72. second guide section;

[0050] 121, heat exchange cavity; 122, fan cavity; 151, disk body; 152, mounting portion; 153, first reinforcing column; 161, first volute tongue; 162, second volute tongue; 163, second reinforcing column; 164, cavity; 165, first reinforcing rib; 166, second reinforcing rib; 171, first wall surface; 172, second wall surface; 511, first protruding section; 512, second protruding section;

[0051] 1611, first guide wall; 1612, first stop groove; 1613, first stop protrusion; 1621, second guide wall; 1622, second stop groove; 1623, second stop protrusion; 1624, concave cavity; 1651, first reinforcement section; 1652, second reinforcement section; 1661, third reinforcement section; 1662, fourth reinforcement section. DETAILED DESCRIPTION

[0052] In the related art, the embedded indoor unit generally includes a housing, a fan, a heat exchanger and a water receiving tray. An installation cavity is formed in the housing. The fan and the heat exchanger are arranged side by side in the installation cavity. The water receiving tray is arranged below the heat exchanger. Generally, in order to reduce noise and increase air volume, a volute tongue is arranged on the side of the water receiving tray close to the fan. The volute tongue and the water receiving tray are integrally formed. However, in the above-mentioned embedded indoor unit, due to the large size of the water receiving tray, the integral forming process between the water receiving tray and the volute tongue is relatively difficult.

[0053] Moreover, in general, in order to reduce the mass of the volute tongue and improve the ease of assembly of the volute tongue, a hollow area is formed inside the volute tongue. This hollow area cannot be formed by traditional mold opening methods, and a core pulling process is required to form the hollow area. It is understandable that due to the large length of the water receiving tray and the volute tongue, the core pulling process will be difficult to carry out. Therefore, the difficulty of the one-piece molding process between the water receiving tray and the volute tongue will be further increased.

[0054] Therefore, the embodiments of the present application provide an air duct assembly, an indoor unit and HVAC equipment, which can solve the problem of the difficulty of the integrated molding process between the water receiving tray and the volute tongue in the related art.

[0055] It should be noted that the indoor unit provided in the embodiments of the present application includes but is not limited to a ceiling unit.

[0056] The embodiments of the present application will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0057] See also Figure 1 , Figure 1 This is a cross-sectional view of the indoor unit provided in the embodiment of the present application. Figure 1 As shown, this embodiment provides an air duct assembly, including a water receiving tray 15, which is arranged below the heat exchanger 3 of the indoor unit. Through the setting of the water receiving tray 15, condensed water can flow into the water receiving tray 15, wherein the inner wall of the water receiving tray 15 forms a part of the inner wall of the air duct 12.

[0058] Moreover, in order to prevent the airflow from circulating in the casing of the fan 2 and to guide the airflow to a certain extent, the air duct assembly provided in this embodiment also includes a volute tongue structure 16, which forms a part of the inner wall of the air duct 12, and the fan 2 is arranged adjacent to the volute tongue structure 16. From the above, it can be seen that in the related art, since the volute tongue and the water receiving tray are integrally formed, the molding process of the volute tongue and the water receiving tray is more difficult.

[0059] To do this, combine Figures 2 to 4 , Figure 2 A schematic diagram of a planar structure of a local structure of an indoor unit provided in an embodiment of the present application, Figure 3 for Figure 2 Cross-sectional view along AA direction, Figure 4 for Figure 3 The enlarged schematic diagram of the local structure at B in the figure. In the air duct assembly provided in the present embodiment, the volute tongue structure 16 includes a first volute tongue 161 and a second volute tongue 162; the first volute tongue 161 is connected to the water receiving tray 15, the second volute tongue 162 can be connected to the first volute tongue 161, the second volute tongue 162 can also be connected to the water receiving tray 15, and the second volute tongue 162 can also be connected to the first volute tongue 161 and the water receiving tray 15 at the same time; wherein, the first volute tongue 161 and the second volute tongue 162 are separately arranged. In this way, the second volute tongue 162 can be manufactured separately, and then connected to the first volute tongue 161 and / or the water receiving tray 15 after manufacturing. Compared with the method of integrally forming the water receiving tray and the volute tongue in the related art, such a manufacturing process can reduce the process difficulty when manufacturing the water receiving tray 15 and the volute tongue structure 16, thereby improving the assembly efficiency of the indoor unit.

[0060] It should be noted that the water receiving tray 15 includes a tray body 151 and a mounting portion 152 connected to the tray body 151, the tray body 151 is located below the heat exchanger 3, and the first volute tongue 161 is connected to the tray body 151, and the second volute tongue 162 is connected to the first volute tongue 161 and / or the tray body 151; a water level switch (not shown in the figure) and a water pump (not shown in the figure) can be set on the mounting portion 152, and when the condensed water level in the water receiving tray 15 reaches a certain height, the water pump will pump the water out of the water receiving tray 15.

[0061] The first volute tongue 161 and the disk body 151 may be an integral structure or a split structure. The integral structure may be made by integral molding, while the split structure may be a detachable connection.

[0062] In addition, when the second volute tongue 162 is connected to the first volute tongue 161, the second volute tongue 162 is detachably connected to the first volute tongue 161. Specifically, when the first volute tongue 161 is integrally formed with the disk body 151, the second volute tongue 162 is detachably connected to the first volute tongue 161; when the first volute tongue 161 is detachably connected to the disk body 151, the second volute tongue 162 is detachably connected to the first volute tongue 161.

[0063] When the second volute tongue 162 is connected to the disk body 151, the second volute tongue 162 and the disk body 151 can be integrally formed or detachably connected. Specifically, when the first volute tongue 161 and the disk body 151 are integrally formed, the second volute tongue 162 and the disk body 151 are detachably connected; when the first volute tongue 161 and the disk body 151 are detachably connected, the second volute tongue 162 and the disk body 151 are integrally formed.

[0064] When the second volute tongue 162 is connected to the first volute tongue 161 and the disk body 151 at the same time, the second volute tongue 162 is detachably connected to the first volute tongue 161, and the second volute tongue 162 is detachably connected to the disk body 151. Specifically, when the first volute tongue 161 and the disk body 151 are integrally formed, the second volute tongue 162 is detachably connected to the first volute tongue 161, and the second volute tongue 162 is detachably connected to the disk body 151; when the first volute tongue 161 is detachably connected to the disk body 151, the second volute tongue 162 is detachably connected to the first volute tongue 161, and the second volute tongue 162 is detachably connected to the disk body 151.

[0065] In some specific implementations, in order to improve the assembly efficiency of the air duct assembly provided in this embodiment, the first volute tongue 161 and the disk body 151 may be an integral structure. The integral structure here may be understood as the first volute tongue 161 and the disk body 151 being manufactured and formed by an integral molding method, and since the disk body 151 and the first volute tongue 161 may both be plastic parts, the integral molding method adopted between the disk body 151 and the first volute tongue 161 may be injection molding. Here, there is no limitation on the integral molding method adopted between the disk body 151 and the first volute tongue 161.

[0066] Moreover, when the second volute tongue 162 is connected to the first volute tongue 161 and the disk body 151 at the same time, the second volute tongue 162 and the first volute tongue 161 may be detachably connected, and the second volute tongue 162 and the disk body 151 may also be detachably connected.

[0067] Therefore, in the specific implementation of this embodiment, the second volute tongue 162 is buckled with the first volute tongue 161, and the second volute tongue 162 is detachably connected to the disk body 151. The buckling direction of the second volute tongue 162 and the first volute tongue 161 can be along the extension direction of the air duct 12, or along the up and down direction.

[0068] Specifically, when the buckling direction of the first volute tongue 161 and the second volute tongue 162 is consistent with the extension direction of the air duct 12, the first volute tongue 161 and the water receiving tray 15 are an integral structure, and the second volute tongue 162 and the water receiving tray 15 are detachably connected; or, the first volute tongue 161 and the water receiving tray 15 are detachably connected, and the second volute tongue 162 and the water receiving tray 15 are an integral structure; when the buckling direction of the first volute tongue 161 and the second volute tongue 162 is consistent with the up and down direction, the first volute tongue 161 and the water receiving tray 15 are an integral structure, and the second volute tongue 162 and the first volute tongue 161 are detachably connected; or, the first volute tongue 161 and the water receiving tray 15 are detachably connected, and the second volute tongue 162 and the first volute tongue 161 are detachably connected.

[0069] It is understandable that when the first volute tongue 161 and the second volute tongue 162 are buckled together, if it is necessary to improve the assembly efficiency between the first volute tongue 161 and the second volute tongue 162, a positioning structure can be set between the first volute tongue 161 and the second volute tongue 162 to limit the relative position between the first volute tongue 161 and the second volute tongue 162, thereby improving the assembly efficiency between the first volute tongue 161 and the second volute tongue 162.

[0070] Therefore, please combine Figure 4 In some optional embodiments, a stopper structure may be provided between the first volute tongue 161 and the second volute tongue 162, and the stopper structure is used to limit the relative position between the first volute tongue 161 and the second volute tongue 162. In this way, by providing the stopper structure, the relative position between the first volute tongue 161 and the second volute tongue 162 can be limited, thereby improving the assembly efficiency of the first volute tongue 161 and the second volute tongue 162 connected together.

[0071] Specifically, the first volute tongue 161 has two oppositely arranged first guide walls 1611, and a first stop groove 1612 is formed on the side of each first guide wall 1611 facing the other first guide wall 1611, so as to form a first stop protrusion 1613 beside the first stop groove 1612; the second volute tongue 162 has two oppositely arranged second guide walls 1621, and a second stop groove 1622 is formed on the side of each second guide wall 1621 away from the other second guide wall 1621, so as to form a second stop protrusion 1623 beside the second stop groove 1622; wherein, the stop structure includes a first stop protrusion 1613 and a second stop protrusion 1623, and the first stop protrusion 1613 extends into the second stop groove 1622, and the second stop protrusion 1623 extends into the first stop groove 1612. In this way, through the cooperation between the first stop protrusion 1613 and the second stop groove 1622 and the cooperation between the second stop protrusion 1623 and the first stop groove 1612, the relative position between the first volute tongue 161 and the second volute tongue 162 can be limited, so that the assembly efficiency between the first volute tongue 161 and the second volute tongue 162 is higher.

[0072] Among them, when the first volute tongue 161 and the second volute tongue 162 are buckled together along the extension direction of the air duct 12, the two first guide walls 1611 are relatively arranged in the up and down direction, the two second guide walls 1621 are relatively arranged in the up and down direction, and the first stop protrusion 1613 is covered on the outside of the second stop protrusion 1623, so that the second stop protrusion 1623 exerts an outward expansion squeezing force on the first stop protrusion 1613 to limit the position between the first volute tongue 161 and the second volute tongue 162 in the up and down direction.

[0073] In another embodiment, the first volute tongue 161 has two first guide walls 1611 disposed opposite to each other, and a first stop groove 1612 is formed on one side of the first guide wall 1611 facing the other first guide wall 1611, so as to form a first stop protrusion 1613 beside the first stop groove 1612; the second volute tongue 162 has two second guide walls 1621 disposed opposite to each other, and a second stop groove 1622 is formed on one side of each second guide wall 1621 facing away from the other second guide wall 1621. , so as to form a second stop protrusion 1623 beside the second stop groove 1622; wherein, on one side of the volute tongue structure 16, the stop structure includes a first stop protrusion 1613 and a second stop protrusion 1623, and the first stop protrusion 1613 extends into the second stop groove 1622, and the second stop protrusion 1623 extends into the first stop groove 1612; on the other side of the volute tongue structure 16, the stop structure includes a second stop protrusion 1623, and the end of the first guide wall 1611 extends into the second stop groove 1622.

[0074] Different from the above-mentioned stopper structure, the first stopper groove 1612 and the first stopper protrusion 1613 can be formed on only one first guide wall 1611, and the end of the other first guide wall 1611 can be directly matched with the corresponding second stopper groove 1622. In this way, the manufacturing cost of the first volute tongue 161 can be reduced.

[0075] It should be noted that the above-mentioned up and down directions are Figure 1 and Figure 4 The up and down directions are consistent.

[0076] Please combine Figure 5 and Figure 6 , Figure 5 for Figure 2 A schematic diagram of the three-dimensional structure from another perspective. Figure 6 for Figure 5The enlarged schematic diagram of the local structure at C in the middle. Noise and energy loss will be generated during the flow of gas. In order to reduce the noise and energy loss of gas when flowing through the volute tongue structure 16, in some embodiments, the air duct assembly provided in this embodiment may also include a plurality of guide ribs 7, which are convexly arranged on the surface of the volute tongue structure 16 at intervals along the length direction of the volute tongue structure 16; when the first volute tongue 161 and the second volute tongue 162 are buckled together along the extension direction of the air duct, each guide rib 7 includes a first guide segment 71 and a second guide segment 72 spliced ​​together, the first guide segment 71 is formed on the surface of the first volute tongue 161, and the second guide segment 72 is formed on the surface of the second volute tongue 162; when the first volute tongue 161 and the second volute tongue 162 are buckled together in the up and down direction, the plurality of guide ribs 7 are formed on the surface of the second volute tongue 162.

[0077] In this way, by providing a plurality of guide ribs 7, when the wind flow blown out by the fan 2 flows through the volute tongue structure 16, part of the wind flow is allowed to flow between two adjacent guide ribs 7, so that the wind flow with noise will be separated, so that the energy of the noise can be weakened, so that the noise can be effectively reduced, and thus the performance of the HVAC equipment is better. In addition, the plurality of guide ribs 7 are arranged at intervals along the length direction of the volute tongue structure 16, so that under the guiding effect of the plurality of guide ribs 7, the flow of the wind flow in the length direction of the volute tongue structure 16 can be reduced, that is, the flow of the wind flow in the axial direction of the fan 2 can be reduced, so that the energy loss of the wind flow in the process of flowing to the air outlet 14 can be reduced.

[0078] From the above, it can be known that when the first volute tongue 161 and the second volute tongue 162 are buckled together along the extension direction of the air duct 12, the relative position of the second volute tongue 162 and the first volute tongue 161 in the up and down directions can be limited by the above-mentioned stop structure, and at this time the first volute tongue 161 is connected to the water receiving tray 15. Therefore, the relative position between the second volute tongue 162 and the water receiving tray 15 in the up and down directions can be limited by the stop structure.

[0079] In addition, the relative position of the second volute tongue 162 and the water receiving tray 15 in the extension direction of the air duct 12 and the relative position in the axial direction of the fan 2 also need to be defined.

[0080] Therefore, please combine Figure 7 and Figure 8 , Figure 7 for Figure 2 Cross-sectional view along DD direction, Figure 8 for Figure 7The enlarged schematic diagram of the local structure at E in the middle. As shown in the figure, when the first volute tongue 161 and the disk body 151 are an integral structure, the second volute tongue 162 and the disk body 151 are detachably connected, and the second volute tongue 162 and the disk body 151 can be detachably connected through the fastener 4. Among them, the axial direction of the fastener 4 is consistent with the up and down direction, and the fastener 4 can realize the detachable connection between the second volute tongue 162 and the disk body 151, so as to limit the relative position between the second volute tongue 162 and the water receiving tray 15 in the extension direction of the air duct 12 and the axial direction of the fan 2.

[0081] It should be noted that the above-mentioned fastener 4 can be a screw, and the type of the fastener 4 is not specifically limited.

[0082] When the second volute tongue 162 and the disk body 151 are detachably connected by the fastener 4, it is necessary to open a threaded hole on both the second volute tongue 162 and the disk body 151. After the threaded hole is opened, the structural strength of the second volute tongue 162 and the disk body 151 at the connection point will be affected. Therefore, in some specific embodiments, a first reinforcing column 153 can be provided on the disk body 151, and the threaded hole opened on the disk body 151 passes through the disk body 151 and the first reinforcing column 153; a second reinforcing column 163 aligned with the first reinforcing column 153 can be provided on the second volute tongue 162, and the threaded hole opened on the second volute tongue 162 passes through the second volute tongue 162 and the second reinforcing column 163. In this way, by setting the first reinforcing column 153 and the second reinforcing column 163, the structural strength of the connection point of the disk body 151 and the second volute tongue 162 is made greater, and the connection between the disk body 151 and the second volute tongue 162 is made more reliable.

[0083] It should be noted that, in this embodiment, in order to improve the connection reliability between the second volute tongue 162 and the disk body 151, the second volute tongue 162 and the disk body 151 can be connected by a plurality of fasteners 4, and the distribution direction of the plurality of fasteners 4 is consistent with the length direction of the volute tongue structure 16, that is, consistent with the axial direction of the fan 2. Here, the number of the above-mentioned fasteners 4 is not specifically limited.

[0084] The length direction of the volute tongue structure 16 is Figure 2 The xx-axis direction is consistent.

[0085] It is understandable that when connecting the second volute tongue 162 and the disk body 151 , the threaded holes opened on the two need to be aligned before connection, and the alignment process will affect the assembly efficiency of the second volute tongue 162 installed on the disk body 151 .

[0086] Therefore, in some optional embodiments, a limiting structure 5 is provided between the second volute tongue 162 and the water receiving tray 15, and the limiting structure 5 is used to limit the relative position of the second volute tongue 162 and the water receiving tray 15. In this way, the position of the second volute tongue 162 and the tray body 151 can be limited by the limiting structure 5 first, and then the second volute tongue 162 and the tray body 151 are connected by the fastener 4, so that the second volute tongue 162 is installed on the water receiving tray 15 with higher efficiency.

[0087] Please combine Fig. 9 and Fig.10 , Fig. 9 for Figure 2 Schematic diagram of the three-dimensional structure from another perspective. Fig.10 for Fig. 9 A schematic diagram of the enlarged local structure at F in the middle. As shown in the figure, in some optional embodiments, the limiting structure 5 includes a limiting protrusion 51; the limiting protrusion 51 is arranged on one of the second volute tongue 162 and the water receiving tray 15, and a limiting hole 52 for inserting the protrusion is arranged on the other of the second volute tongue 162 and the water receiving tray 15. In this way, the relative position between the second volute tongue 162 and the tray body 151 can be limited by the plug-in cooperation between the limiting protrusion 51 and the limiting hole 52. Before the second volute tongue 162 and the water receiving tray 15 are connected by the fastener 4, the second volute tongue 162 and the water receiving tray 15 can be positioned first by the cooperation between the second volute tongue 162 and the tray body 151, so that the assembly efficiency of the second volute tongue 162 can be improved.

[0088] It should be noted that, in this embodiment, the protruding direction of the limiting protrusion 51 is consistent with the up-down direction, that is, the axial direction of the limiting hole 52 is consistent with the up-down direction.

[0089] Moreover, in a specific implementation of this embodiment, the limiting protrusion 51 is arranged on the second volute tongue 162 , and the limiting hole 52 is opened on the tray body 151 and penetrates the tray body 151 in the thickness direction of the water receiving tray 15 .

[0090] From the above, it can be seen that the fasteners 4 are provided in plurality and are spaced apart along the length direction of the volute tongue structure 16. Therefore, in the present embodiment, the limiting structures 5 can also be provided in plurality and are spaced apart along the length direction of the volute tongue structure 16. In this way, for each connection point of the fasteners 4, the second volute tongue 162 and the disk body 151 can be aligned through the limiting structures 5, which can further improve the assembly efficiency between the second volute tongue 162 and the disk body 151.

[0091] It can be understood that when the first volute tongue 161 and the water receiving tray 15 are integrally formed or when the second volute tongue 162 is simultaneously connected to the first volute tongue 161 and the water receiving tray 15, if the weight of the first volute tongue 161 and the second volute tongue 162 are larger, it is not conducive to the integral forming of the first volute tongue 161 and the water receiving tray 15 and is not conducive to the assembly between the first volute tongue 161 and the second volute tongue 162. Therefore, in an optional embodiment, the first volute tongue 161 and the second volute tongue 162 are buckled together to form a cavity 164. In this way, a part of the side wall of the cavity is formed by the side wall of the first volute tongue 161, and the other part of the side wall of the cavity 164 is formed by the side wall of the second volute tongue 162, that is, the interior of the volute tongue structure 16 is hollow. When the first volute tongue 161 and the second volute tongue 162 are buckled together to form the cavity 164, the mass of the first volute tongue 161 and the second volute tongue 162 themselves is reduced, so it is more convenient to integrate the first volute tongue 161 and the water receiving tray 15 or to install the second volute tongue 162 on the first volute tongue 161, thereby making the assembly efficiency between the volute tongue structure 16 and the water receiving tray 15 higher.

[0092] From the above, it can be seen that in the present embodiment, the interior of the volute tongue structure 16 is hollow. When the interior of the volute tongue structure 16 is hollow, the strength of the volute tongue structure 16 itself may be reduced. Therefore, in order to improve the strength of the volute tongue structure 16 itself, a corresponding reinforcement structure may be provided on the first volute tongue 161 and / or the second volute tongue 162 to improve the strength of the volute tongue structure 16 itself.

[0093] Please combine Figures 11 to 13 , Fig.11 This is a schematic diagram of the three-dimensional structure of the water receiving tray and the first volute tongue in the indoor unit provided in an embodiment of the present application after being connected. Fig.12 for Fig.11 The enlarged schematic diagram of the local structure at G in the middle. Fig.13 A schematic diagram of the three-dimensional structure of the second volute tongue in the indoor unit provided in an embodiment of the present application. As shown in the figure, in this embodiment, a first reinforcing rib 165 is provided on the side of the first volute tongue 161 facing the second volute tongue 162, and the shape of the first reinforcing rib 165 is consistent with the outline shape of the first volute tongue 161; a second reinforcing rib 166 is provided on the side of the second volute tongue 162 facing the first volute tongue 161, and the shape of the second reinforcing rib 166 is consistent with the outline shape of the second volute tongue 162. In this way, by providing the first reinforcing rib 165 on the first volute tongue 161 and the second reinforcing rib 166 on the second volute tongue 162, the structural strength of the volute tongue structure 16 can be improved.

[0094] pass Fig.12 and Fig.13It can be seen that in a specific implementation manner of this embodiment, the first reinforcement rib 165 includes a first reinforcement segment 1651 and a second reinforcement segment 1652 connected together, the first reinforcement segment 1651 extends in the up and down directions, the extension direction of the second reinforcement segment 1652 is perpendicular to the extension direction of the first reinforcement segment 1651, and the second reinforcement segment 1652 is connected to one end of the first reinforcement segment 1651 close to the disk body 151, that is, the second reinforcement segment 1652 is connected to the lower end of the first reinforcement segment 1651.

[0095] pass Fig.13 It can be seen that in a specific implementation of this embodiment, the second reinforcement rib 166 includes a third reinforcement segment 1661 and a fourth reinforcement segment 1662 connected together, the third reinforcement segment 1661 and the fourth reinforcement segment 1662 are arranged at an angle, and there is an angle between the extension direction of the third reinforcement segment 1661 and the fourth reinforcement segment 1662 and the up and down directions.

[0096] In order to further improve the strength of the volute tongue structure 16, the first reinforcing rib 165 and the second reinforcing rib 166 can be provided in plurality, and the plurality of first reinforcing ribs 165 and the plurality of second reinforcing ribs 166 can be distributed at intervals along the length direction of the volute tongue structure 16, that is, distributed at intervals along the axial direction of the fan 2. In this embodiment, the number of the first reinforcing rib 165 and the second reinforcing rib 166 is not specifically limited.

[0097] As can be seen from the above, a hollow area extending along the length direction of the volute tongue structure 16 is formed in the volute tongue structure 16. By forming the hollow area, the weight of the volute tongue structure 16 is reduced, and the connection efficiency between the volute tongue structure 16 and the water receiving tray 15 is improved.

[0098] Please combine Fig.14 and Fig.15 As shown, Fig.14 for Fig. 9 A schematic diagram of the structure from another perspective. Fig.15 for Fig.14 A schematic diagram of the enlarged local structure at H in the middle. In some optional embodiments, in order to improve the utilization efficiency of the airflow, a return channel 17 can be formed. In this embodiment, the return channel 17 is formed between the volute tongue structure 16 and the water receiving tray 15; wherein the return channel 17 is used to guide part of the airflow on the air outlet side of the fan 2 to the air inlet side of the fan 2. In this way, through the formation of the return channel 17, a certain air replenishment effect can be achieved, and the utilization efficiency of the airflow can be improved, so as to improve the performance of the indoor unit.

[0099] Specifically, the reflux channel 17 has a first wall surface 171 and a second wall surface 172 that are oppositely disposed. The first wall surface 171 is located below the second wall surface 172 . The first wall surface 171 is formed by a portion of the side wall of the water receiving tray 15 .

[0100] When the first volute tongue 161 and the second volute tongue 162 are buckled together along the extension direction of the air duct 12, the second wall surface 172 is formed by the first guide wall 1611 and the second guide wall 1621; when the first volute tongue 161 and the second volute tongue 162 are buckled together along the up and down direction, the second wall surface 172 is formed by a portion of the outer surface of the first volute tongue 161.

[0101] In order to allow air to flow through, the return channel 17 needs to have a certain height. Therefore, in order to form a return channel 17 with a certain height, in some optional embodiments, a support structure is provided between the first volute tongue 161 and / or the second volute tongue 162 and the water receiving tray 15, and the support structure is adapted to the height of the limiting structure 5 to jointly define the height of the return channel 17. In other words, through the provision of the support structure, the support structure and the limiting structure 5 jointly define the height of the return channel 17, that is, the height of the support structure and the limiting structure 5 is consistent with the height of the return channel 17.

[0102] like Fig.11 , Fig.12 , Fig.14 and Fig.15 As shown, the support structure is arranged between the first volute tongue 161 and the water receiving tray 15, and the support structure includes a plurality of support ribs 6 arranged at intervals along the length direction of the volute tongue structure 16. In this way, a certain gap can exist between the first volute tongue 161 and the top wall of the tray body 151 to form a reflux channel 17, and by providing a plurality of support ribs 6, the height of the reflux channel 17 in the length direction of the volute tongue structure 16 can be relatively uniform, which can improve the air replenishment effect of the reflux channel 17. Here, the number of the above-mentioned support ribs 6 is not specifically limited.

[0103] It should be noted that in a specific implementation of this embodiment, the support rib 6, the first volute tongue 161 and the water receiving tray 15 are integrally formed, for example, the integrally formed water receiving tray 15, the support rib 6 and the first volute tongue 161 are formed by injection molding.

[0104] From the above, it can be known that when the first volute tongue 161 and the second volute tongue 162 are buckled together along the extension direction of the air duct 12, the second wall surface 172 is formed by the first guide wall 1611 and the second guide wall 1621. Therefore, a certain gap should also be formed between the second volute tongue 162 and the disk body 151 to define the above-mentioned return channel 17.

[0105] Please combine Fig.16 , Fig.16 for Fig.13In order to form a certain gap between the second volute tongue 162 and the disk body 151 and to reduce the manufacturing cost of the second volute tongue 162, in a specific implementation of this embodiment, the shape of the limiting protrusion 51 can be limited to form the above-mentioned gap.

[0106] For example, the limiting protrusion 51 may include a first protruding section 511 and a second protruding section 512. The first protruding section 511 is connected to the second volute tongue 162, and the second protruding section 512 extends into the limiting hole 52. In order to enable the limiting protrusion 51 to define the above-mentioned gap, the size of the first protruding section 511 in the extension direction of the air duct 12 is larger than the size of the second protruding section 512 in this direction, and the shape and size of the limiting hole 52 are adapted to the shape and size of the second protruding section 512, so that the first protruding section 511 abuts against the top wall of the disk body 151, thereby being able to form a partial reflux channel 17 between the second volute tongue 162 and the disk body 151.

[0107] Please combine Fig.17 , Fig.17 for Fig.13 The enlarged schematic diagram of the local structure at J in the middle. In the process of manufacturing the second volute tongue 162, in order to facilitate the demolding of the mold, a plurality of concave cavities 1624 spaced apart along the length direction of the volute tongue structure 16 can be formed on the outer side of the second volute tongue 162. In this way, the provision of the concave cavities 1624 facilitates the demolding of the mold for producing the second volute tongue 162, thereby improving the processing efficiency of the second volute tongue 162. Among them, the setting surface of the concave cavities 1624 is opposite to the setting surface of the limiting protrusion 51.

[0108] It should be noted that the number of the above-mentioned concave cavities 1624 is determined according to the actual demolding conditions of the mold, and here, there is no specific limitation on the number of concave cavities 1624.

[0109] like Figure 1 As shown, this embodiment also provides an indoor unit, including a fan 2, a heat exchanger 3 and the air duct assembly in the above-mentioned embodiment. Taking the ceiling unit as an example, the indoor unit also includes a panel (not shown in the figure) and a casing 11. The bottom of the casing 11 is open, and the panel cover is arranged at the open part. An air duct 12 is formed in the casing 1, and the air duct 12 includes a heat exchange cavity 121 and a fan cavity 122 that are connected. The heat exchanger 3 is arranged in the heat exchange cavity 121, and the fan 2 is arranged in the fan cavity 122. The panel has a return air port 13 and an air outlet 14 that are connected to the air duct 12 and are arranged at intervals. The return air port 13 is arranged adjacent to the heat exchanger 3, and the air outlet 14 is arranged adjacent to the fan 2. Specifically, the return air port 13 is connected to the heat exchange cavity 121, and the air outlet 14 is connected to the fan cavity 122.

[0110] During the operation of the indoor unit, the external air flow enters the heat exchange chamber 121 from the return air port 13. Under the action of the fan 2, the air flow is heated or cooled by the heat exchanger 3, flows into the fan chamber 122, and finally flows to the indoor environment through the air outlet 14, heating or cooling the indoor environment.

[0111] It should be noted that when the indoor unit provided in this embodiment is a ceiling unit, the casing 11 is embedded in the ceiling, and the panel is flush with the ceiling, that is, the above-mentioned return air inlet 13 and air outlet 14 are both located at the top of the indoor environment.

[0112] This embodiment further provides a HVAC device, including the indoor unit in the above embodiment. The indoor unit has been described in detail in the above embodiment, and will not be described again here.

[0113] It should be noted that the HVAC equipment provided in this embodiment should also include other components or modules such as an outdoor unit. Here, other components or modules in the HVAC equipment provided in this embodiment will not be introduced one by one.

Claims

1. An air duct assembly, It is characterized in that It includes a water receiving tray and a volute tongue structure, wherein the water receiving tray and the volute tongue structure form part of the inner wall of the air duct, and the volute tongue structure includes a first volute tongue and a second volute tongue; The first volute tongue is connected to the water receiving tray, and the second volute tongue is connected to the first volute tongue and / or the water receiving tray; Wherein, the first volute tongue and the second volute tongue are arranged separately.

2. The air duct assembly according to claim 1, It is characterized in that The first volute tongue and the second volute tongue are buckled together along the extension direction of the air duct; Wherein, the first volute tongue and the water receiving tray are an integral structure, and the second volute tongue and the water receiving tray are detachably connected; or, The first volute tongue is detachably connected to the water receiving tray, and the second volute tongue is an integral structure with the water receiving tray.

3. The air duct assembly according to claim 2, It is characterized in that It also includes a plurality of guide ribs, which are protruded and arranged on the surface of the volute tongue structure at intervals along the length direction of the volute tongue structure; Each of the guide ribs includes a first guide segment and a second guide segment that are spliced ​​together. The first guide segment is formed on the surface of the first volute tongue, and the second guide segment is formed on the surface of the second volute tongue.

4. The air duct assembly according to claim 1, It is characterized in that The first volute tongue and the second volute tongue are buckled together along the up-down direction; Wherein, the first volute tongue and the water receiving tray are an integrated structure, and the second volute tongue is detachably connected to the first volute tongue; or, The first volute tongue is detachably connected to the water receiving tray, and the second volute tongue is detachably connected to the first volute tongue.

5. The air duct assembly according to claim 4, It is characterized in that It also includes a plurality of guide ribs, which are protruded and arranged on the surface of the second volute tongue at intervals along the length direction of the volute tongue structure.

6. The air duct assembly according to claim 1, It is characterized in that A stop structure is provided between the first volute tongue and the second volute tongue, and the stop structure is used to limit the relative position between the first volute tongue and the second volute tongue.

7. The air duct assembly according to claim 6, It is characterized in that The first volute tongue has two first guide walls arranged opposite to each other, and a first stop groove is formed on one side of each first guide wall facing the other first guide wall, so as to form a first stop protrusion beside the first stop groove; The second volute tongue has two second guide walls arranged opposite to each other, and a second stop groove is formed on a side of each second guide wall facing away from the other second guide wall, so as to form a second stop protrusion beside the second stop groove; Wherein, the stop structure includes the first stop protrusion and the second stop protrusion, and the first stop protrusion extends into the second stop groove, and the second stop protrusion extends into the first stop groove.

8. The air duct assembly according to claim 6, It is characterized in that The first volute tongue has two first guide walls arranged opposite to each other, and a first stop groove is formed on one side of one of the first guide walls facing the other first guide wall, so as to form a first stop protrusion beside the first stop groove; The second volute tongue has two second guide walls arranged opposite to each other, and a second stop groove is formed on a side of each second guide wall facing away from the other second guide wall, so as to form a second stop protrusion beside the second stop groove; Among them, on one side of the volute tongue structure, the stop structure includes the first stop protrusion and the second stop protrusion, and the first stop protrusion extends into the second stop groove, and the second stop protrusion extends into the first stop groove; on the other side of the volute tongue structure, the stop structure includes the second stop protrusion, and the end of the first guide wall extends into the second stop groove.

9. The air duct assembly according to claim 7 or 8, It is characterized in that The second volute tongue is detachably connected to the water receiving tray via a fastener.

10. The air duct assembly according to claim 9, It is characterized in that A limiting structure is provided between the second volute tongue and the water receiving tray, and the limiting structure is used to limit the relative position of the second volute tongue and the water receiving tray.

11. The air duct assembly according to claim 10, It is characterized in that The limiting structure includes a limiting protrusion; The limiting protrusion is arranged on one of the second volute tongue and the water receiving tray, and a limiting hole for inserting the protrusion is arranged on the other of the second volute tongue and the water receiving tray.

12. The air duct assembly according to claim 10, It is characterized in that A reflux channel is formed between the volute tongue structure and the water receiving tray, or a reflux channel is formed on the volute tongue structure; The return flow channel is used to guide part of the airflow on the air outlet side of the fan to the air inlet side of the fan.

13. The air duct assembly according to claim 12, It is characterized in that The reflux channel is formed between the volute tongue structure and the water receiving tray; The reflux channel comprises a first wall surface and a second wall surface which are arranged opposite to each other. The first wall surface is formed by a part of the side wall of the water receiving tray, and the second wall surface is formed by the first guide wall and the second guide wall.

14. The air duct assembly according to claim 12, It is characterized in that A supporting structure is provided between the first volute tongue and / or the second volute tongue and the water receiving tray, and the height of the supporting structure matches that of the limiting structure to jointly define the height of the reflux channel.

15. The air duct assembly according to claim 14, It is characterized in that The support structure is arranged between the first volute tongue and the water receiving tray, and the support structure includes a plurality of support ribs arranged at intervals along the length direction of the volute tongue structure.

16. The air duct assembly according to any one of claims 1 to 8 and 10 to 15, It is characterized in that The first volute tongue and the second volute tongue are buckled together to form a cavity.

17. The air duct assembly according to claim 16, It is characterized in that A first reinforcing rib is provided on a side of the first volute tongue facing the second volute tongue, and a shape of the first reinforcing rib is consistent with a contour shape of the first volute tongue; and / or, A second reinforcing rib is provided on a side of the second volute tongue facing the first volute tongue, and a shape of the second reinforcing rib is consistent with a contour shape of the second volute tongue.

18. The air duct assembly according to any one of claims 1 to 8 and 10 to 15, It is characterized in that A plurality of concave cavities are formed on the outer side of the second volute tongue and are distributed at intervals along the length direction of the volute tongue structure.

19. An indoor unit, It is characterized in that It comprises a fan, a heat exchanger and the air duct assembly according to any one of claims 1 to 18; The fan and the heat exchanger are both arranged in the air duct and spaced apart on the flow path of the airflow. The heat exchanger is located above the water receiving tray, and the fan is arranged adjacent to the volute tongue structure.

20. The indoor unit according to claim 19, It is characterized in that It also includes a panel and a casing, wherein the casing has an open bottom, and the panel cover is arranged at the open bottom; The panel is provided with a return air port and an air outlet which are connected with the air duct and are arranged at intervals. The return air port is arranged adjacent to the heat exchanger, and the air outlet is arranged adjacent to the fan.

21. A heating and ventilation equipment, It is characterized in that Includes the indoor unit according to claim 19 or 20.

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