Air duct assembly, indoor unit and heating and ventilation equipment

Abstract

The invention 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 in taller buildings and other structures, ceiling units are more commonly used.

[0003] In related technologies, an embedded indoor unit generally includes a shell, a fan, a heat exchanger and a water collection pan. An installation cavity is formed in the shell, and the fan and the heat exchanger are arranged side by side in the installation cavity. The water collection 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 collection pan close to the fan, and the volute tongue is integrally formed with the water collection pan.

[0004] However, in the above-mentioned embedded indoor unit, since the size of the water receiving tray is relatively large, the integral molding process between the water receiving tray and the volute tongue is relatively difficult. Summary of the Invention

[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 the first aspect, the present application provides an air duct assembly, including a water receiving tray and a volute tongue structure, the water receiving tray and the volute tongue structure form part of the inner wall of the air duct, 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.

[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 and second volute tongues are buckled together in the vertical 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 connecting carrier, which facilitates the determination of the dimensions of the water receiving tray and the second volute tongue during the manufacturing and molding of the water receiving tray and the second volute tongue.

[0010] As an optional embodiment, it further 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-described solution, by providing multiple guide ribs, the wind flow blown by the fan is allowed to partially flow between two adjacent guide ribs when flowing through the volute tongue structure. This separates the noisy wind flow, weakening the noise energy and effectively reducing the noise, thereby improving the performance of the HVAC equipment. Furthermore, the multiple guide ribs are arranged at intervals along the length of the volute tongue structure. Thus, the guiding effect of the multiple guide ribs can reduce the flow of wind along the length of the volute tongue structure, that is, reduce the flow of wind in the axial direction of the fan, thereby reducing energy loss during the flow of wind toward the outlet.

[0012] As an optional embodiment, a stopper structure is provided between the first and second volute tongues to limit the relative position of the first and second volute tongues. Thus, the provision of the stopper structure can limit the relative position of the first and second volute tongues, thereby improving the assembly efficiency of the connection between the first and second volute tongues.

[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 embodiment, 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, the limiting structure being used to restrict 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 first limited by the limiting structure, and then the second volute tongue and the tray body can be connected by fasteners, making the second volute tongue more efficiently installed on the water receiving tray.

[0017] As an optional embodiment, the limiting structure includes a limiting protrusion; the limiting protrusion is provided 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 with the fastener, the second volute tongue and the water receiving tray can be positioned by the cooperation between the second volute tongue and the tray body, thereby improving the assembly efficiency of the second volute tongue.

[0018] As an optional embodiment, a return flow channel is formed between the volute tongue structure and the water tray, or the volute tongue structure has a return flow channel formed therein; the return flow channel is used to guide part of the airflow from the fan outlet side to the fan inlet side. In this way, the formation of the return flow channel can achieve a certain air replenishment effect, improve the efficiency of airflow utilization, and thus enhance the performance of the indoor unit.

[0019] As an optional embodiment, a reflux channel is formed between the volute structure and the water receiving tray; the reflux channel has a first wall and a second wall arranged opposite to each other, the first wall is formed by part of the side wall of the water receiving tray, and the second wall is formed by the first guide wall and the second guide wall.

[0020] As an optional embodiment, 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 is adapted to the limiting structure to jointly define the height of the return channel.

[0021] As an optional embodiment, a support structure is provided between the first volute tongue and the water receiving tray, and the support structure includes a plurality of support ribs spaced along the length of the volute tongue structure. This allows for a certain gap between the first volute tongue and the top wall of the tray body to form a return flow channel. Furthermore, the provision of multiple support ribs ensures a relatively uniform height of the return flow channel along the length of the volute tongue structure, thereby enhancing the return flow channel's air replenishment effect.

[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 portion of the sidewalls of the cavity are formed by the sidewalls of the first volute tongue, and another portion of the sidewalls of the cavity are formed by the sidewalls of the second volute tongue. That is, the interior of the volute tongue structure is hollow. When the first and second volute tongues are buckled together to form the cavity, the mass of the first and second volute tongues themselves is reduced. This makes it more convenient to integrally mold the first volute tongue with the water receiving tray or to install the second volute tongue on the first volute tongue, thereby improving the assembly efficiency between the volute tongue structure and the water receiving tray.

[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 outline 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 outline 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, the outer side of the second volute tongue is formed with a plurality of concave cavities spaced along the length of the volute tongue structure. In this way, the provision of the concave cavities facilitates the demolding of the mold for producing the second volute tongue, thereby improving the processing efficiency of the second volute tongue.

[0025] In the second aspect, the present application provides an indoor unit, including 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 in the embodiments of the present application, the air duct assembly includes a water receiving tray and a volute tongue structure, 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 provided separately. 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 of a separate 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, this 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 in 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0030] Figure 1 A cross-sectional view of the 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 point B in the middle;

[0034] Figure 5 for Figure 2 A schematic diagram of the three-dimensional structure from another perspective;

[0035] Figure 6 for Figure 5 A magnified schematic diagram of the local structure at point 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] Figure 9 for Figure 2 Schematic diagram of the three-dimensional structure from another perspective;

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

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

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

[0042] Figure 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] Figure 14 for Figure 9 Schematic diagram of the structure from another perspective;

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

[0045] Figure 16 for Figure 13 A magnified schematic diagram of the local structure at point I in the middle;

[0046] Figure 17 for Figure 13 A magnified 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. Casing; 12. Air duct; 13. Return air outlet; 14. Air outlet; 15. Drain tray; 16. Snail structure; 17. Return channel; 51. Position-limiting protrusion; 52. Position-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; 172, second wall; 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 related art, embedded indoor units typically include a housing, a fan, a heat exchanger, and a water tray. The housing defines a mounting cavity, within which the fan and heat exchanger are positioned side by side, with the water tray positioned below the heat exchanger. Typically, to reduce noise and increase airflow, a volute is positioned on the side of the water tray near the fan, with the volute and the water tray being integrally formed. However, in these embedded indoor units, the large size of the water tray makes the integral molding process for the water tray and volute quite challenging.

[0053] Moreover, in general, in order to reduce the mass of the volute tongue and improve the assembly convenience of the volute tongue, a hollow area will be formed inside the volute tongue. This hollow area cannot be formed by traditional mold opening methods, and it is necessary to combine the core pulling process 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, and 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 with reference to the accompanying drawings and specific implementation methods.

[0057] See 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 arrangement 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 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 part of the inner wall of the air duct 12. 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 relatively difficult.

[0059] To do this, combine Figures 2 to 4 , Figure 2 This is a schematic plan view of the partial structure of the 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 An enlarged schematic diagram of the local structure at point B in the figure. In the air duct assembly provided in this 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, and 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, or the second volute tongue 162 can be connected to both the first volute tongue 161 and the water receiving tray 15 simultaneously. The first volute tongue 161 and the second volute tongue 162 are provided separately. 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 volute tongue in the related art, this 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 161 is connected to the tray body 151, and the second volute 162 is connected to the first volute 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. When the water level of the condensed water in the water receiving tray 15 reaches a certain height, the water pump will pump out the water in the water receiving tray 15.

[0061] The first volute tongue 161 and the disc body 151 can be an integral structure or a separate structure. The integral structure can be made by integral molding, while the separate structure can be connected in a detachable manner.

[0062] Furthermore, 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 disc 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 disc 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 either 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 simultaneously connected to the first volute tongue 161 and 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. 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 embodiments, to improve the assembly efficiency of the air duct assembly provided in this embodiment, the first volute tongue 161 and the disc body 151 may be integrally formed. The integral structure herein can be understood as meaning that the first volute tongue 161 and the disc body 151 are manufactured by integral molding. Since both the disc body 151 and the first volute tongue 161 can be plastic parts, the integral molding method used for the disc body 151 and the first volute tongue 161 can be injection molding. The integral molding method used for the disc body 151 and the first volute tongue 161 is not limited herein.

[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-down direction.

[0068] Specifically, when the fastening 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 fastening 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 to limit the relative position of the first volute tongue 161 and the second volute tongue 162. In this way, the provision of the stopper structure can limit the relative position of the first volute tongue 161 and the second volute tongue 162, thereby improving the assembly efficiency of the first volute tongue 161 and the second volute tongue 162.

[0071] Specifically, the first volute tongue 161 has two oppositely arranged first guide walls 1611, and each first guide wall 1611 has a first stop groove 1612 formed on the side 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 each second guide wall 1621 has a second stop groove 1622 formed on the side 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, 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 arranged opposite to each other in the up and down direction, the two second guide walls 1621 are arranged opposite to each other 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 oppositely disposed first guide walls 1611, 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 next to the first stop groove 1612; the second volute tongue 162 has two oppositely disposed second guide walls 1621, and a second stop groove 1622 is formed on the side of each second guide wall 1621 facing away from the other second guide wall 1621. , 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] Unlike the aforementioned stopper structure, the first stop groove 1612 and the first stop 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 engaged with the corresponding second stop 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 Schematic diagram of the three-dimensional structure from another perspective, Figure 6 for Figure 5A magnified schematic diagram of the local structure at point C in the middle. Noise and energy loss are generated during the flow of gas. To reduce the noise and energy loss when the gas flows through the volute tongue structure 16, in some embodiments, the air duct assembly provided in this embodiment may further include a plurality of guide ribs 7, which are protruded from 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-down direction, the plurality of guide ribs 7 are all formed on the surface of the second volute tongue 162.

[0077] In this way, by providing multiple 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 will flow between two adjacent guide ribs 7. In this way, 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 multiple guide ribs 7 are arranged at intervals along the length direction of the volute tongue structure 16. In this way, under the guiding effect of the multiple guide ribs 7, the flow of wind flow in the length direction of the volute tongue structure 16 can be reduced, that is, the flow of wind flow in the axial direction of the fan 2 can be reduced, thereby reducing the energy loss of wind flow in the process of flowing toward the air outlet 14.

[0078] From the above, it can be seen 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. 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 positions of the second volute tongue 162 and the water receiving tray 15 in the extension direction of the air duct 12 and 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 7An enlarged schematic diagram of the partial structure at point E in the middle. As shown, when the first volute tongue 161 and the disc body 151 are integrally formed, the second volute tongue 162 is detachably connected to the disc body 151, and the second volute tongue 162 and the disc body 151 are detachably connected via a fastener 4. The axial direction of the fastener 4 coincides with the vertical direction, enabling the detachable connection between the second volute tongue 162 and the disc body 151 to be defined relative to 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 aforementioned fastener 4 may be a screw, and the type of the fastener 4 is not specifically limited.

[0082] When the second volute tongue 162 and the disc body 151 are detachably connected via the fastener 4, threaded holes need to be provided on both the second volute tongue 162 and the disc body 151. The provision of threaded holes will affect the structural strength of the connection between the second volute tongue 162 and the disc body 151. Therefore, in some specific embodiments, the disc body 151 may be provided with a first reinforcing post 153, with the threaded hole provided on the disc body 151 extending through the disc body 151 and the first reinforcing post 153. The second volute tongue 162 may be provided with a second reinforcing post 163 aligned with the first reinforcing post 153, with the threaded hole provided on the second volute tongue 162 extending through the second volute tongue 162 and the second reinforcing post 163. In this way, the provision of the first reinforcing post 153 and the second reinforcing post 163 enhances the structural strength of the connection between the disc body 151 and the second volute tongue 162, making the connection between the disc body 151 and the second volute tongue 162 more reliable.

[0083] It should be noted that in this embodiment, 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 multiple fasteners 4, and the distribution direction of the multiple 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, there is no specific limitation on the number of the above-mentioned fasteners 4.

[0084] The length direction of the 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. 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 162 and the water receiving tray 15, and the limiting structure 5 is used to limit the relative position of the second volute 162 and the water receiving tray 15. In this way, the position of the second volute 162 and the tray body 151 can be first limited by the limiting structure 5, and then the second volute 162 and the tray body 151 can be connected by the fastener 4, so that the second volute 162 is installed on the water receiving tray 15 more efficiently.

[0087] Please combine Figure 9 and Figure 10 , Figure 9 for Figure 2 Schematic diagram of the three-dimensional structure from another perspective, Figure 10 for Figure 9 An enlarged schematic diagram of the partial structure at point 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 provided on one of the second volute tongue 162 and the water receiving tray 15, and the other of the second volute tongue 162 and the water receiving tray 15 is provided with a limiting hole 52 for the protrusion to be inserted. In this way, the relative position between the second volute tongue 162 and the tray body 151 can be limited by the plug-in fit between the limiting protrusion 51 and the limiting hole 52. Before the second volute tongue 162 and the water receiving tray 15 are connected via the fastener 4, the second volute tongue 162 and the water receiving tray 15 can be positioned first by the fit between the second volute tongue 162 and the tray body 151, thereby improving the assembly efficiency of the second volute tongue 162.

[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 provided on the second volute tongue 162 , and the limiting hole 52 is provided on the tray body 151 and passes through 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 this 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 structure 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 large, 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 portion of the side walls of the cavity are formed by the side walls of the first volute tongue 161, and another portion of the side walls of the cavity 164 are formed by the side walls 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. Therefore, whether it is to integrally mold 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, it is more convenient, 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 this 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 can 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 , Figure 11 This is a schematic diagram of the three-dimensional structure of the indoor unit provided by the embodiment of the present application after the water receiving tray and the first volute tongue are connected. Figure 12 for Figure 11 A magnified schematic diagram of the local structure at G in the middle. Figure 13 This is 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. The shape of the first reinforcing rib 165 is consistent with the outline 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. The shape of the second reinforcing rib 166 is consistent with the outline of the second volute tongue 162. Thus, 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 Figure 12 and Figure 13It can be seen that in the specific implementation 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 the 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 Figure 13 It can be seen that in a specific implementation of this embodiment, the second reinforcing rib 166 includes a third reinforcing segment 1661 and a fourth reinforcing segment 1662 connected together, the third reinforcing segment 1661 and the fourth reinforcing segment 1662 are set at an angle, and there is an angle between the extension direction of the third reinforcing segment 1661 and the fourth reinforcing segment 1662 and the up and down directions.

[0096] To further enhance the strength of the volute tongue structure 16, a plurality of the first reinforcing ribs 165 and the second reinforcing ribs 166 may be provided, and the plurality of first reinforcing ribs 165 and the plurality of second reinforcing ribs 166 may be spaced apart along the length of the volute tongue structure 16, that is, spaced apart along the axial direction of the fan 2. In this embodiment, there is no specific limitation on the number of the first reinforcing ribs 165 and the second reinforcing ribs 166.

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

[0098] Please combine Figure 14 and Figure 15 As shown, Figure 14 for Figure 9 A structural diagram from another perspective. Figure 15 for Figure 14 An enlarged schematic diagram of the partial structure at point H in the figure. In some optional embodiments, to improve airflow utilization efficiency, a return channel 17 may be formed. In this embodiment, return channel 17 is formed between the volute structure 16 and the water tray 15. Return channel 17 is used to divert part of the airflow from the outlet side of fan 2 to the inlet side of fan 2. The formation of return channel 17 thus provides a certain air replenishment effect, improving airflow utilization efficiency and enhancing 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 arranged. 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 jointly 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 in the up and down direction, the second wall surface 172 is formed by part 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. 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, the support structure is provided so that it 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 Figure 11 、 Figure 12 、 Figure 14 and Figure 15 As shown, the support structure is disposed between the first volute 161 and the water receiving tray 15 and includes a plurality of support ribs 6 spaced along the length of the volute structure 16. This allows for a certain gap between the first volute 161 and the top wall of the tray body 151 to form a return channel 17. Furthermore, the provision of multiple support ribs 6 ensures a relatively uniform height of the return channel 17 along the length of the volute structure 16, thereby enhancing the air replenishment effect of the return channel 17. The number of 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] As can be seen from the above, 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 Figure 16 , Figure 16 for Figure 13In order to form a certain gap between the second volute tongue 162 and the disc 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 return channel 17 between the second volute tongue 162 and the disk body 151.

[0107] Please combine Figure 17 , Figure 17 for Figure 13 An enlarged schematic diagram of the partial structure at point J in the middle. During the manufacturing process of the second volute tongue 162, to facilitate mold removal, a plurality of concave cavities 1624 can be formed on the outside of the second volute tongue 162, spaced apart along the length of the volute tongue structure 16. The provision of the concave cavities 1624 facilitates mold removal for producing the second volute tongue 162, thereby improving the processing efficiency of the second volute tongue 162. The concave cavities 1624 are disposed on a surface opposite to the surface on which the limiting protrusions 51 are disposed.

[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 herein, 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 position. An air duct 12 is formed in the shell 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 spaced apart. 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 through 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 heating and ventilation device, comprising the indoor unit in the above embodiment, wherein the indoor unit has been described in detail in the above embodiment and will not be described in detail 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, 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 separately provided.

2. The air duct assembly according to claim 1, 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, characterized in that: It also includes a plurality of guide ribs, which are protruded from 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 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, characterized in that: 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.

5. The air duct assembly according to claim 4, characterized in that: 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.

6. The air duct assembly according to claim 1, 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, 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 a 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, 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 the 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; 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, 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, 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, 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 the protrusion to be inserted is provided on the other of the second volute tongue and the water receiving tray.

12. The air duct assembly according to claim 10, 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, characterized in that: The 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 oppositely 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 the first guide wall and the second guide wall.

14. The air duct assembly according to claim 12, wherein: 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, 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, 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, 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 the 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, 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, characterized in that: comprising 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, wherein: It also includes a panel and a casing, wherein the bottom of the casing is open, and the panel cover is arranged at the open position; The panel is provided with an air return port and an air outlet which are in communication with the air duct and are spaced apart from each other. The air return port is arranged adjacent to the heat exchanger, and the air outlet is arranged adjacent to the fan.

21. A HVAC equipment, characterized in that: Including the indoor unit according to claim 19 or 20.

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