Air duct assembly and air-conditioning apparatus

Abstract

An air duct assembly (10) and an air-conditioning apparatus. The air-conditioning apparatus comprises an air duct assembly (10), a fan (91), and a heat exchanger (92); the air duct assembly (10) comprises a first housing (20) and a second housing (30), and the first housing (20) and the second housing (30) together define a diffusion chamber (12) and a heat exchange chamber (13) that are communicated with each other and an air outlet (15) communicated with the heat exchange chamber (13), the diffusion chamber (12) is configured to be communicated with the air outlet side of the fan (91), and the heat exchange chamber (13) is configured to accommodate the heat exchanger (92); and the second housing (30) comprises a diffusion chamber lower housing (50) and a water receiving tray (60) that are connected to each other, the diffusion chamber lower housing (50) defines a chamber bottom wall of the diffusion chamber (12), and the water receiving tray (60) defines a chamber bottom wall of the heat exchange chamber (13), wherein the diffusion chamber lower housing (50) and the water receiving tray (60) are integrally formed members.

Description

Duct components and air conditioning devices Technical Field

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

[0002] An existing indoor air conditioning device includes a shell structure, a fan and a heat exchanger. A duct structure is formed in the shell structure, and the heat exchanger is arranged in the duct. A water collecting pan is also provided under the heat exchanger. The fan drives the air flow through the duct to flow through the heat exchange device and then discharge it to the outside after heat exchange. The water collecting pan is provided to receive the condensed water generated during the operation of the heat exchanger.

[0003] Usually, on the air duct path from the fan to the heat exchanger, the shell structure is spliced ​​with multiple plates to form an air duct, and these plates are connected to the water collection pan so that the wind in the air duct can blow smoothly to the heat exchanger carried by the water collection pan. However, if the shell structure and the water collection pan are improperly installed, or the sealing ring is aged or damaged, gaps may exist between them, resulting in gas leakage, which will cause a certain loss of airflow energy and may also generate noise or abnormal sounds, increasing subsequent maintenance costs. In addition, the installation process is complicated and production efficiency is low. Summary of the Invention

[0004] The embodiments of the present application provide an air duct assembly and an air conditioning device, which can reduce airflow energy loss in the air conditioning device.

[0005] In a first aspect, an embodiment of the present application provides an air duct assembly, which is applied to an air conditioning device, the air conditioning device including a fan and a heat exchanger, the air duct assembly including a first shell and a second shell, the first shell and the second shell cooperating to define a pressure diffuser chamber, a heat exchange chamber, and an air outlet connected to the heat exchange chamber, the pressure diffuser chamber being configured to connect to the air outlet side of the fan, and the heat exchange chamber being configured to accommodate the heat exchanger;

[0006] The second housing includes a lower shell of the pressure diffuser chamber and a water receiving tray connected to each other, the lower shell of the pressure diffuser chamber defines a cavity bottom wall of the pressure diffuser chamber, and the water receiving tray defines a cavity bottom wall of the heat exchange chamber;

[0007] Among them, the lower shell of the diffuser chamber and the water receiving tray are integrally formed components.

[0008] Based on the air duct assembly of the embodiment of the present application, the pressure diffuser formed by the first shell and the second shell is connected to the air outlet side of the fan, so that the airflow blown out by the fan can convert part of the kinetic energy into static pressure through the pressure diffusion effect of the pressure diffuser, reduce the wind speed, and then efficiently exchange heat with the heat exchanger in the heat exchange chamber. The present application further designs the pressure diffuser lower shell forming the cavity bottom wall of the pressure diffuser and the cavity bottom wall forming the heat exchange chamber as an integrated molding. In this way, in the air duct structure from the pressure diffuser to the heat exchange chamber, the situation of splicing the shells to form the air duct is reduced. In this way, the gap at the connection between the pressure diffuser and the heat exchange chamber is reduced, and the cavity walls of the two are more integrated. In this way, during the flow of air, the leakage is greatly reduced, that is, the static pressure loss is reduced, which can increase the air supply volume and improve the heat exchange efficiency. In addition, compared with the existing solution of splicing multiple panels to obtain an air duct shell structure, and then splicing and fixing the branch shell structure to the water receiving tray, the present application forms the diffuser chamber bottom wall and the water receiving tray as one piece, which reduces the number of parts and components and can improve production and assembly efficiency.

[0009] In some embodiments, the lower shell of the pressure diffuser chamber and the water receiving tray are smoothly transitioned at the connection between the pressure diffuser chamber and the heat exchange chamber.

[0010] In this implementation, the smooth transition at the connection between the lower shell of the pressure diffuser chamber and the water receiving tray can ensure a uniform flow field in the air duct, avoid turbulence in the air duct, and thus reduce noise.

[0011] In some embodiments, the lower shell of the pressure diffuser chamber is inclined upward in a direction away from the water receiving tray, and the first shell and the side of the lower shell of the pressure diffuser chamber away from the water receiving tray further define a fan chamber connected to the pressure diffuser chamber, and the fan chamber is configured to accommodate a fan;

[0012] The first shell and the second shell cooperate to define a return air port communicated with the fan cavity, and the return air port is at least partially directed downward.

[0013] In this implementation, the lower shell of the diffusion chamber can achieve a diffusion effect on the airflow, so that the airflow will be smoother and more uniform when entering the heat exchanger, reducing noise. In addition, a return air outlet is defined between the first shell and the water receiving tray, which can increase the area of ​​the return air outlet, improve the return air efficiency, and thus improve the heat exchange efficiency.

[0014] In some embodiments, the second housing further includes a fan cavity front housing connected to a side of the diffuser cavity lower housing away from the water receiving tray, and the first housing includes a fan cavity rear housing, wherein the fan cavity front housing and the fan cavity rear housing define the fan cavity and the return air outlet;

[0015] The first downstream end of the fan cavity front shell is arranged flush with the second downstream end of the fan cavity rear shell in the horizontal direction, and the return air outlet is arranged at the lower side of the fan; or

[0016] The first downstream end of the fan cavity front shell and the second downstream end of the fan cavity rear shell are not arranged flush in the horizontal direction, so that the return air outlet is at least partially located on the front side or the rear side of the fan.

[0017] In some embodiments, a volute tongue is further included, which is fixed at the transition between the front shell of the fan chamber and the lower shell of the diffuser chamber.

[0018] In some embodiments, the lower shell of the diffuser cavity includes a diffuser portion and a mounting portion, one side of the diffuser portion is connected to the water receiving tray, and the mounting portion is connected to a side of the diffuser portion away from the water receiving tray;

[0019] The air duct assembly further comprises a volute tongue which is fixed on the mounting portion.

[0020] In this implementation, the diffuser portion and the mounting portion are integrally formed on the lower shell of the diffuser chamber, and the volute tongue can be installed without external components. The installation operation is convenient, the number of components is reduced, and the production efficiency and assembly efficiency are improved.

[0021] In some embodiments, the air outlet is oriented horizontally.

[0022] In this implementation, the horizontal air outlet has a good heat exchange effect, which improves the user's comfort.

[0023] In some embodiments, the water receiving tray includes a water receiving portion and a drain portion connected to each other, the water receiving portion being configured to carry the heat exchanger and connected to the lower shell of the diffuser chamber, the water receiving portion forming a water receiving trough open upward, and the drain portion being disposed on one side of the water receiving portion and communicating with the water receiving trough;

[0024] The bottom wall of the water receiving trough is inclined downward in the direction toward the drainage portion.

[0025] In this implementation, the water receiving trough is open upward, which makes it easy for the water receiving pan to receive the condensed water generated when the heat exchanger is working. The bottom wall of the water receiving trough is tilted downward toward the drainage part to improve the water collecting and diverting effect of the water receiving pan. The drainage part discharges the collected condensed water, and the structure is simple and compact.

[0026] In some embodiments, the second shell further includes a pipe portion connected to the drainage portion and the side of the lower shell of the pressure diffuser chamber, and the pipe portion is provided with a through hole for the refrigerant pipe of the heat exchanger to pass through;

[0027] Among them, the pipe section, the lower shell of the diffuser chamber and the drainage section are an integrated structure.

[0028] In some embodiments, a lap boss is provided on the bottom wall of the water receiving trough, and the lap boss is configured to support the heat exchanger and cooperate with the heat exchanger to divide the heat exchange cavity into a front heat exchange cavity and a rear heat exchange cavity, wherein the front heat exchange cavity is connected to the pressure diffusion cavity; and the rear heat exchange cavity is connected to the air outlet;

[0029] The opening size of the heat exchange rear cavity is reduced in the direction from the overlapping boss to the air outlet.

[0030] In this implementation, the overlapping boss supports the heat exchanger, which can prevent the heat exchanger from being immersed in accumulated water and causing rust when there is a lot of condensed water. The opening size of the heat exchange cavity is reduced in the direction from the overlapping boss to the air outlet, which can increase the wind speed of the outlet air and prevent the outlet air from carrying condensed water.

[0031] In some embodiments, the bottom wall of the rear heat exchange chamber is configured to be an arc surface, and the bottom wall of the rear heat exchange chamber extends upward in a direction from the overlapping boss to the air outlet.

[0032] In this implementation, the curved surface structure can reduce wind resistance and guide the airflow, thereby increasing the wind speed and reducing noise and abnormal sound.

[0033] Based on the above embodiments, the embodiments of the present application form a second shell by integrally molding the lower shell of the pressure diffuser chamber and the water receiving tray, and then assemble the second shell with the first shell to obtain an air duct assembly. This can not only improve the production efficiency and assembly efficiency of the air duct assembly, but also reduce the gap at the connection between the pressure diffuser chamber and the heat exchange chamber, and the cavity walls of the two are more integrated, reducing the resistance and pressure loss of the air flow, thereby reducing the generation of noise and abnormal sounds, and also improving the heat exchange efficiency.

[0034] In a second aspect, an embodiment of the present application provides an air conditioning device, comprising a fan, a heat exchanger and the above-mentioned air duct assembly, wherein the air outlet side of the fan is connected to the diffusion chamber, and the heat exchanger is arranged in the heat exchange chamber.

[0035] In this implementation, the present application adopts the above-mentioned air duct assembly, which can reduce the number of parts, improve production efficiency, and simplify the installation process.

[0036] In some embodiments, the heat exchanger is arranged in an arc shape, and the number of refrigerant pipes in the middle of the heat exchanger is greater than the number of refrigerant pipes on both sides of the heat exchanger;

[0037] The central axis of the pressure diffusion cavity passes through the middle of the heat exchanger.

[0038] In this implementation, the central axis of the diffusion chamber is structurally arranged to pass through the middle of the heat exchanger, so that most of the airflow in the diffusion chamber passes through the middle of the heat exchanger. Since there are more refrigerant pipes in the middle of the heat exchanger, the heat exchange efficiency of this application can be effectively improved.

[0039] In some embodiments, the device further comprises an electric control box assembly, wherein the electric control box assembly is disposed on the lower side of the lower shell of the pressure diffuser chamber;

[0040] Wherein, at least a portion of the return air outlet is arranged on the front side of the fan and is spaced apart from the electric control box assembly.

[0041] Some embodiments further include an air duct interface, the air duct interface being connected to the first shell and / or the second shell and being located between a side of the water receiving tray close to the lower shell of the diffuser chamber and a side of the first shell away from the water receiving tray;

[0042] Wherein, the air duct interface is arranged around the return air outlet and below the electric control box assembly.

[0043] In some embodiments, the fan is a crossflow fan.

[0044] In this application, the air conditioning device adopts the above-mentioned air duct assembly to make the structure of the product more compact. Moreover, due to the high integrity of the bottom wall of the diffusion chamber and the bottom wall of the heat exchange chamber, the connectivity of the air duct is more harmonious, avoiding the generation of noise and abnormal sounds caused by air flow pressure relief. At the same time, it can effectively improve the air outlet speed, improve the heat exchange efficiency, and reduce the number of parts, making it more convenient to produce, transport, install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 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.

[0046] FIG1 is a schematic structural diagram of an air conditioning device provided in an embodiment of the present application;

[0047] FIG2 is a schematic structural diagram of an air conditioning device provided in an embodiment of the present application from another angle;

[0048] FIG3 is a first exploded view of an air conditioning device provided in an embodiment of the present application;

[0049] FIG4 is a second exploded view of an air conditioning device provided in an embodiment of the present application;

[0050] FIG5 is a front view of an air conditioning device provided in an embodiment of the present application;

[0051] FIG6 is a cross-sectional view taken at AA in FIG5 ;

[0052] FIG7 is a cross-sectional view taken at BB in FIG5 ;

[0053] FIG8 is a schematic structural diagram of a second housing provided in an embodiment of the present application;

[0054] FIG9 is a schematic structural diagram of a second housing provided in an embodiment of the present application at another angle;

[0055] FIG10 is a front view of a second housing provided in an embodiment of the present application;

[0056] FIG11 is a cross-sectional view taken along line CC in FIG10 .

[0057] Figures: 1, indoor unit; 10, air duct assembly; 11, fan chamber; 12, pressure diffusion chamber; 13, heat exchange chamber; 131, heat exchange front chamber; 132, heat exchange rear chamber; 14, return air outlet; 15, air outlet; 20, first shell; 21a, fan chamber rear shell; 21a1, second downstream end; 21b, fan chamber upper shell; 22, pressure diffusion chamber upper shell; 23, heat exchange chamber upper shell; 30, second shell; 31, fan chamber front shell; 31a, first downstream end; 32, grille; 33, insulation material; 34, heat exchange chamber lower shell; 35, pipe section; 351, first Connecting plate; 352, second connecting plate; 353, through hole; 40, volute; 50, lower shell of the diffuser chamber; 51, diffuser portion; 52, mounting portion; 521, guide surface; 53, return port; 60, water receiving tray; 61, water receiving portion; 611, water receiving trough; 612, overlapping boss; 62, drainage portion; 621, water storage groove; 622, drainage pipe; 623, water pump mounting block; 70, side panel; 71, fixing portion; 72, guide portion; 721, air guide surface; 91, fan; 92, heat exchanger; 93, electrical control box assembly; 100, air duct interface. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of this application clearer, the following part will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0059] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0060] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0062] Referring to Figures 1 to 3 , embodiments of the present application provide an air duct assembly 10 and an air conditioning device. As will be appreciated, the air conditioning device includes an indoor unit 1 and an outdoor unit. Figures 1 to 3 illustrate the indoor unit 1, which includes the air duct assembly 10, a fan 91, a heat exchanger 92, and an electrical control box assembly 93. The fan 91 and heat exchanger 92 are controlled by the electrical control box assembly 93.

[0063] Referring to Figures 4 and 5, the air duct assembly 10 is formed with an air duct and has a return air port 14 and an air outlet 15. In some embodiments, the air duct is provided with a connected fan cavity 11, a diffuser cavity 12 and a heat exchange cavity 13 between the return air port 14 and the air outlet 15. The return air port 14, the fan cavity 11, the diffuser cavity 12, the heat exchange cavity 13 and the air outlet 15 are arranged in sequence to form at least part of the air flow channel.

[0064] The fan chamber 11 houses a fan 91, which drives the external air flow into the fan chamber 11 from the return air port 14, and drives the air flow from the fan chamber 11 into the pressure diffuser chamber 12. After the air flow is diffused by the pressure diffuser chamber 12, it enters the heat exchange chamber 13. A heat exchanger 92 is provided in the heat exchange chamber 13. After the air flow passes through the heat exchanger 92, the temperature or humidity and other properties are adjusted, and the air flow flows out of the indoor unit 1 of the air conditioning device through the air outlet 15 and flows into the indoor environment, thereby achieving the purpose of regulating the air in the space. During the operation of the indoor unit 1, the outdoor unit compresses the refrigerant through the compressor and transports the refrigerant to the heat exchanger 92 of the indoor unit 1 through the circulation flow path. The fan 91 drives the air flow into the air duct from the return air port 14, and flows through the diffusion chamber 12 and the heat exchange chamber 13 in turn, and exchanges heat with the heat exchanger 92. After the refrigerant exchanges heat with the air in the heat exchange chamber 13, it flows out of the indoor unit 1 and returns to the compressor of the outdoor unit, and is compressed by the compressor again to the predetermined temperature and pressure, thereby starting a new round of refrigerant circulation.

[0065] As shown in Figures 4 to 6, the air duct assembly 10 of the present application includes a first shell 20 and a second shell 30. After the first shell 20 and the second shell 30 are assembled, a fan cavity 11, a pressure diffusion cavity 12 and a heat exchange cavity 13 are formed in the interior, which are connected in sequence. The fan 91 is arranged in the fan cavity 11, and the heat exchanger 92 is arranged in the heat exchange cavity 13. The fan 91 can be a crossflow wind wheel, a centrifugal wind wheel or an axial flow wind wheel, etc. In the scheme shown in Figure 2, the fan 91 is a crossflow wind wheel. When the fan 91 is configured as a crossflow wind wheel, the crossflow wind wheel has the advantages of large air volume, low noise and simple installation. In addition, the present application forms a fan cavity 11, and the fan 91 in the form of a crossflow wind wheel is installed in the fan cavity 11. Compared with the solution of using a centrifugal wind wheel in traditional technology, there is no need to consider the installation structure of the centrifugal shell outside the centrifugal wind wheel, which reduces the difficulty of assembly and improves production efficiency.

[0066] As shown in Figures 5 and 6, in some embodiments, the heat exchanger 92 is arranged in an arc shape, and the number of refrigerant tubes in the middle of the heat exchanger 92 is greater than the number of refrigerant tubes on both sides of the heat exchanger 92; wherein, referring to Figure 6, the central axis of the pressure diffusion chamber 12 (i.e., the dotted line in the figure) passes through the middle of the heat exchanger 92. Such an arrangement enables the airflow transmitted by the pressure diffusion chamber 12 to pass more through the middle of the heat exchanger 92. Since the number of refrigerant tubes in the middle of the heat exchanger 92 is greater than the number of refrigerant tubes on both sides of the heat exchanger 92, the heat exchange efficiency of the embodiment of the present application can be effectively improved. Moreover, the arc-shaped heat exchanger 92 can not only increase the heat exchange area, but also make the heat exchange efficiency higher. In other embodiments, the heat exchanger 92 can also adopt other structures, such as: a single-fold plate structure, a V-shaped structure, a wavy structure, etc.

[0067] As shown in Figures 5 and 6, in some embodiments, the cross-sectional area of ​​the diffuser chamber 12 gradually increases from upstream to downstream in the air duct, and the outlet of the diffuser chamber 12 terminates at the inlet of the heat exchange chamber 13. In other words, the cross-sectional area of ​​the diffuser chamber 12 reaches its maximum at the junction with the heat exchange chamber 13. During operation, driven by the fan 91, airflow from the outlet side of the fan 91 sequentially flows through the diffuser chamber 12 and the heat exchange chamber 13 before being discharged into the room through the air outlet 15. As the airflow passes through the diffuser chamber 12, some of its kinetic energy is converted into static pressure, reducing its flow rate, thereby enabling sufficient heat exchange with the heat exchanger 92.

[0068] As shown in Figures 5, 8, and 9, the second housing 30 includes a connected pressure diffuser lower housing 50 and a water receiving tray 60. The pressure diffuser lower housing 50 defines the bottom wall of the pressure diffuser chamber 12, and the water receiving tray 60 defines the bottom wall of the heat exchange chamber 13. The pressure diffuser lower housing 50 and the water receiving tray 60 are integrally formed components. In this embodiment of the present application, by configuring the pressure diffuser lower housing 50 and the water receiving tray 60 as an integrally formed component, the number of components of the second housing 30 is reduced to a certain extent, compared to the air duct formation scheme of the indoor unit 1 of the related air conditioning device, which uses multiple panels to separately form the heat exchange chamber 13 and the pressure diffuser chamber 12, and then connects the heat exchange chamber 13 and the pressure diffuser chamber 12. This can improve the production efficiency and installation efficiency of the second housing 30 and reduce costs. Furthermore, when the pressure diffuser lower shell 50 and the water receiving tray 60 are configured as an integrally molded component, the pressure diffuser lower shell 50 and the water receiving tray 60 smoothly transition from the pressure diffuser 12 to the heat exchange chamber 13. This smooth transition between the two ensures a uniform flow field within the air duct, avoids turbulence within the air duct, and thereby reduces noise. In some embodiments, the second shell 30 can be injection molded or hot-pressed. For example, the second shell 30 can be integrally molded using plastic injection molding, which simplifies the manufacturing process, is suitable for commercial production, and can effectively reduce costs. Furthermore, the plastic material is lightweight, which can reduce product weight and facilitate transportation and installation.

[0069] It should be noted that in the prior art, the cavity structure forming the pressure diffuser chamber 12 and the water receiving tray 60 are typically separate components that are then joined together to form the air duct. This results in a large number of panels and a complex connection method, resulting in numerous joints between the pressure diffuser structure and the water receiving tray 60, which are prone to gaps. Therefore, high sealing requirements are required during installation. The present application integrates the pressure diffuser chamber lower shell 50, which forms the cavity bottom wall of the pressure diffuser chamber 12, and the water receiving tray 60, which forms the cavity bottom wall of the heat exchange chamber 13, into an integrated design. This significantly reduces the number of spliced ​​shell panels in the air duct structure between the pressure diffuser chamber 12 and the heat exchange chamber 13, thereby reducing the risk of gaps at the joints and simplifying installation. Consequently, the cavity bottom wall of the pressure diffuser chamber 12 and the cavity bottom wall of the heat exchange chamber 13 have a higher degree of integrity, significantly reducing leakage during airflow, lowering static pressure loss, and ensuring smoother airflow, thereby increasing airflow volume and heat exchange efficiency and reducing noise.

[0070] In summary, the above-mentioned embodiments of the present application achieve the following technical effects: First, the design of the integral molding of the diffuser chamber lower shell 50 and the water receiving tray 60 not only reduces the number of parts, but also reduces the complexity of the assembly process. This one-piece structure can improve the overall stability and durability. Secondly, the use of an integrally molded bottom wall of the diffuser chamber 12 and the bottom wall of the heat exchange chamber 13 can also provide a more uniform airflow distribution. Compared with the shell structure formed by splicing multiple panels, the one-piece design can eliminate the unevenness problem at the splicing point, ensure that the airflow in the air duct flows more smoothly, and reduce energy loss and pressure loss. In addition, the one-piece molded bottom wall of the diffuser chamber 12 and the bottom wall of the heat exchange chamber 13 can also improve the sealing of the entire air duct assembly 10. Since the cavity bottom wall is manufactured by one-time molding, there is no splicing point, which can effectively reduce the possibility of airflow leakage. This optimized sealing can not only improve the working efficiency of the system, but also help prevent irrelevant gases or foreign objects from entering the air duct, protecting the safe and stable operation of the heat exchange chamber 13. In general, the embodiment of the present application is based on the design concept of one-piece molding, and is optimized by the connection structure between the pressure diffuser chamber 12 and the heat exchange chamber 13, which not only simplifies the manufacturing and assembly process, but also improves the stability, durability and overall work efficiency of the system.

[0071] The return air vent 14 can be positioned directly below the fan cavity 11 and facing the fan cavity 11, that is, facing downward. After entering the return air vent 14, the airflow can flow to the fan cavity 11 via a shorter path, increasing the return air velocity. This arrangement also reduces the thickness of the indoor unit, making it easier to install in environments with low ceilings. In some embodiments, the return air vent 14 can also be partially oriented forward or backward to accommodate different installation environments.

[0072] As shown in Figures 3 to 6, in some embodiments, the first housing 20 includes a main body and side panels 70. The main body and side panels 70 form an open-bottomed housing structure. The main body includes a fan chamber rear housing 21a, a fan chamber upper housing 21b, a diffuser chamber upper housing 22, and a heat exchange chamber upper housing 23, which are sequentially connected. The diffuser chamber upper housing 22 defines the top wall of the diffuser chamber 12, and the heat exchange chamber upper housing 23 defines the top wall of the heat exchange chamber 13. The main body, side panels 70, and second housing 30 together enclose an air duct. The first shell 20 and the second shell 30 are assembled, and the side panels 70 are located between the main shell 30 and the second shell 30, and are located on both sides of the fan chamber 11 and the diffuser chamber 12 along the air flow direction. Please refer to Figure 7. In some embodiments, the side panels 70 include a fixed portion 71 and a guide portion 72 connected to each other. The fixed portion 71 is located on both sides of the fan chamber 11 and is configured to install and fix the fan 91. The guide portion 72 is located on both sides of the diffuser chamber 12, wherein the guide portion 72 is provided with an air guide surface 721 on the side facing the diffuser chamber 12. The air guide surface 721 extends inward from the diffuser chamber 12 to the heat exchange chamber 13. The air guide surface 721 mainly guides the airflow in the diffuser chamber 12, so that most of the airflow can pass through the middle of the heat exchanger 92, thereby improving the heat exchange efficiency of the embodiment of the present application.

[0073] The second housing 30 further includes a fan chamber front housing 31 and a volute 40 located at the junction of the fan chamber front housing 31 and the diffuser chamber lower housing 50. The fan chamber rear housing 21a of the first housing 20 and the fan chamber front housing 31 of the second housing 30 are arranged relative to each other in the front-to-back direction. The fan chamber upper housing 21b of the first housing 20 bends forward from the fan chamber rear housing 21a and extends in an arc shape to the upstream end of the diffuser chamber upper housing 22. The fan chamber upper housing 21b of the first housing 20 and the volute 40 are located on opposite sides of the air duct bend. The heat exchange chamber upper housing 23 and the water receiving tray 60 are arranged relative to each other in the top-to-bottom direction, with the air outlet 15 defined between the heat exchange chamber upper housing 23 and the water receiving tray 60.

[0074] Furthermore, in order to insulate the airflow within the heat exchanger 92, an insulating material piece 33 is provided on the inner wall of the upper shell 23 of the heat exchange chamber, and an insulating material piece 33 is provided on the back side of the water receiving tray 60. Furthermore, a heat exchange chamber lower shell 34 is provided on the back side of the insulating material piece 33. The heat exchange chamber lower shell 34 can be made of metal or plastic. The heat exchange chamber lower shell 34 can protect the insulating material piece 33. Specifically, during installation, the insulating material piece 33 is first placed on the bottom of the water receiving tray 60, and then the heat exchange chamber lower shell 34 and the water receiving tray 60 are fixed relative to each other using screws or bolts. The insulating material piece 33 and the heat exchange chamber lower shell 34 can be simultaneously installed on the bottom of the water receiving tray 60, and the installation operation is simple.

[0075] In some embodiments, the first downstream end 31a of the fan cavity front shell 31 is not flush with the second downstream end 21a1 of the fan cavity rear shell 21a, so that the return air outlet 14 is at least partially located on the front side or rear side of the fan 91. Specifically, as shown in Figures 5 to 6, the first downstream end 31a of the fan cavity front shell 31 is higher than the second downstream end 21a1 of the fan cavity rear shell 21a, and the return air outlet 14 is at least partially located on the front side of the fan 91. Further, the return air outlet 14 can be entirely located on the front side of the fan 91; or the return air outlet 14 can extend from the bottom side of the fan 91 to the front side of the fan 91; or, the first downstream end 31a of the fan cavity front shell 31 is lower than the second downstream end 21a1 of the fan cavity rear shell 21a, and at least partially located on the rear side of the fan 91. Further, the return air outlet 14 can be entirely located on the rear side of the fan 91, or the return air outlet 14 can extend from the bottom side of the fan 91 to the rear side of the fan 91. In other embodiments, the first downstream end 31a of the fan cavity front shell 31 is arranged flush with the second downstream end 21a1 of the fan cavity rear shell 21a, and the return air port 14 is arranged on the lower side of the fan 91.

[0076] In order to achieve good protection for the fan 91, in some embodiments, the present application may further be provided with a grille 32, which covers at least one side of the fan 91 facing the return air outlet 14 to achieve protection for the fan 91. Specifically, referring to Figure 5 again, the return air outlet 14 extends from the bottom side of the fan 91 to the front side of the fan 91. One side of the grille 32 can be connected to the fan cavity rear shell 21a, and the other side can be connected to the fan cavity front shell 31, wherein the other side of the grille 32 is higher than one side of the grille 32. In some other embodiments (not shown), the return air outlet 14 extends from the bottom side of the fan 91 to the rear side of the fan 91. One side of the grille 32 can be connected to the fan cavity rear shell 21a, and the other side can be connected to the fan cavity front shell 31, wherein the other side of the grille 32 is lower than one side of the grille 32. Of course, in some other embodiments (not shown), the return air vent 14 is only provided on the front or rear side of the fan 91, the grille 32 is provided on the front or rear side of the fan 91, and the lower side of the fan 91 is sealed by a plate or other component. In other embodiments (not shown), the first downstream end 31a of the fan cavity front shell 31 is provided flush with the second downstream end 21a1 of the fan cavity rear shell 21a, the return air vent 14 is provided on the lower side of the fan 91, and the grille 32 horizontally connects the first downstream end 31a of the fan cavity front shell 31 and the second downstream end 21a1 of the fan cavity rear shell 21a.

[0077] As shown in Figures 5 and 6, in some embodiments, the air outlet 15 is oriented in the horizontal direction. Since the horizontal air outlet can make the airflow evenly distributed in the heat exchanger 92, a better heat exchange effect can be achieved. In addition, the horizontal air outlet can also make the air flow more stable, reduce unnecessary airflow disturbances and noise, and improve the working efficiency and comfort of the system. Optionally, in some embodiments, the direction of the air outlet 15 is downward. For example, in some installation environments, the demand for side air outlet cannot be met, and in this case, a downward air outlet solution is required. By using a variety of different mounting accessories and interfaces, the direction of the air outlet 15 can be flexibly adjusted to meet the actual needs of different users or different scenarios. This flexibility can not only meet the personalized needs of users, but also expand the scope of application of the embodiments of the present application, and improve the applicability, stability and reliability of the entire system.

[0078] As shown in Figures 8 and 9, in some embodiments, the lower shell 50 of the diffusion chamber is tilted upward in the direction away from the water receiving tray 60. Such a setting can change the flow state and speed of the airflow, so that the gas can produce a state of pressure reduction, expansion and dispersion during the flow process, thereby achieving better distribution and uniformity of the airflow, and then making the airflow more stable and smooth when entering the heat exchanger 92, reducing noise.

[0079] Furthermore, as shown in Figures 5 and 6 , since the diffuser chamber lower shell 50 is tilted upward away from the water receiving pan 60, there is space at the bottom of the diffuser chamber lower shell 50. In this embodiment of the present application, the electrical control box assembly 93 is disposed at the bottom of the diffuser chamber lower shell 50. During installation, the electrical control box assembly 93 can be secured to the bottom of the diffuser chamber lower shell 50 using screws or bolts, or by snap fastening. This arrangement effectively utilizes the internal space of the indoor unit, resulting in a smaller overall product size. Furthermore, when the electrical control box assembly 93 requires maintenance, it can be performed directly at the bottom of the indoor unit without disassembling the entire indoor unit, which is more convenient and hassle-free.

[0080] At the same time, please refer to Figures 5 and 6 again. When at least part of the return air outlet 14 is set on the front side of the fan 91, the return air outlet 14 on the front side is opposite to the front and back of the electrical control box assembly 93, so that the external air flow enters the return air outlet 14 on the front side through the surface of the electrical control box assembly 93, which is beneficial to the air cooling and heat dissipation of the electrical control box assembly 93.

[0081] In some embodiments, the indoor unit 1 is a duct unit. The embodiments of the present application further include a duct interface 100, which is connected to the first housing 20 and / or the second housing 30. The duct interface 100 is configured to connect to the air inlet duct of the duct unit. As shown in FIG6 , the duct interface 100 is connected to the fan cavity rear housing 21a and the side of the water tray 60 facing the electrical control box assembly 93. In this way, the duct interface 100 can be located between the side of the water tray 60 close to the diffuser cavity lower housing 50 and the side of the first housing 20 away from the water tray 60. The duct interface 100 is disposed around the return air outlet 14 and below the electrical control box assembly 93. When the fan 91 is working, the external air flow enters the space between the second shell 30 and the fan cavity rear shell 21a from the air inlet duct through the air duct interface 100. The return air port 14 and the electrical control box assembly 93 are set in the space. Part of the external air flow passes through the air duct interface 100 and then enters the return air port 14. Part of the external air flow passes through the air duct interface 100 and then passes through the surface of the electrical control box assembly 93 and enters the return air port 14.

[0082] As shown in Figures 8 to 10, in some embodiments, the air duct assembly 10 of the present application further includes a volute 40, which is fixed at the junction between the fan chamber front shell 31 and the diffuser chamber lower shell 50. The diffuser chamber lower shell 50 includes a diffuser portion 51 and a mounting portion 52. One side of the diffuser portion 51 is connected to the water receiving tray 60. The mounting portion 52 is connected to the side of the diffuser portion 51 away from the water receiving tray 60 and is located at the junction between the diffuser portion 51 and the fan chamber front shell 31. The volute 40 is fixed to the mounting portion 52. The mounting portion 52 facilitates the installation of the volute 40 in the diffuser chamber lower shell 50 of the present application. In some embodiments, the mounting portion 52 is provided with multiple snap-fit ​​connectors, allowing the volute 40 and mounting portion 52 to be secured together. This installation method is simple and can improve production efficiency. As an optional embodiment, the mounting portion 52 can be provided with multiple threaded holes, allowing the volute 40 to be secured to the mounting portion 52 using threaded members such as screws or bolts. Furthermore, the diffuser portion 51 and mounting portion 52 of the embodiment of the present application can be formed by injection molding, which simplifies the manufacturing process, reduces the number of parts, and improves assembly efficiency. During operation, the airflow from the fan 91 flows smoothly along the volute tongue 40 into the diffuser chamber 12, thereby reducing the generation of noise and abnormal sounds.

[0083] Please refer to Figures 8 to 9. The diffuser 51 is provided with a return port 53 at one end near the mounting portion 52, which passes through the two relative surfaces in the thickness direction. The return port 53 connects the diffuser chamber 12 and the fan chamber 11. During operation, when the airflow flows from the fan chamber 11 to the diffuser chamber 12, under the action of the pressure difference in the inlet and outlet directions of the return port 53, part of the airflow in the diffuser chamber 11 will be returned to the fan chamber 11 from the return port 53 and enter the fan chamber 11 again to work, which can make up for the low-pressure area near the volute 40, weaken the vortex caused by the pressure difference, and thus improve the aerodynamic performance of the air duct assembly 10. Such a counterflow design helps to stabilize the airflow in the flow field, reduce the noise and abnormal sound generated in the air duct, and the setting method is simple and easy to produce. Further, please refer to Figure 11. A guide surface 521 is provided at the bottom of the mounting portion 52 on the side near the return port 53. The guide surface 521 extends in the direction of the fan chamber 11. By setting the length of the guide surface 521, the efficiency of the airflow in the diffuser chamber 12 returning to the fan chamber 11 can be controlled and adjusted. By rationally designing the guide surface 521, the embodiment of the present application can optimize the flow path of the airflow and further reduce the generation of noise. This design is highly flexible and is applicable to air duct assemblies 10 of different sizes and specifications. The embodiment of the present application can reduce noise and can adapt to air duct assemblies 10 of different sizes and specifications.

[0084] As shown in Figures 8 to 10, in some embodiments, the water receiving tray 60 includes a connected water receiving portion 61 and a drain portion 62. The water receiving portion 61 is configured to support the heat exchanger 92 and is connected to the diffuser chamber lower shell 50. The water receiving portion 61 is formed with an upwardly open water receiving trough 611. The drain portion 62 is disposed on one side of the water receiving portion 61 and is in communication with the water receiving trough 611. The bottom wall of the water receiving trough 611 slopes downward toward the drain portion 62. When the heat exchanger 92 is operating, water generated on the surface of the heat exchanger 92 flows to the bottom wall of the water receiving trough 611 under the action of gravity. Because the bottom wall of the water receiving trough 611 slopes downward toward the drain portion 62, the flow rate of condensed water in the water receiving trough 611 is further increased, thereby preventing the condensed water from staying in the water receiving trough 611 for too long. The condensed water eventually flows into the drain portion 62 and is discharged from the drain portion 62.

[0085] The water receiving pan 60 of the present embodiment can achieve a good water collection and diversion effect, preventing condensed water from accumulating in the water receiving pan 60, which could breed bacteria and even cause corrosion to the water receiving pan 60. In some embodiments, a lap boss 612 is provided on the bottom wall of the water receiving trough 611. The lap boss 612 is configured to support the heat exchanger 92 and cooperates with the heat exchanger 92 to divide the heat exchange chamber 13 into a front heat exchange chamber 131 and a rear heat exchange chamber 132. The front heat exchange chamber 131 is connected to the pressure diffuser chamber 12, and the rear heat exchange chamber 132 is connected to the air outlet 15. It is understandable that when the heat exchanger 92 is working, condensed water will accumulate in the water receiving trough 611. An upwardly protruding overlapping boss 612 is provided on the bottom wall of the water receiving trough 611. The heat exchanger 92 is then installed and fixed on the overlapping boss 612. This can prevent the heat exchanger 92 from being soaked in water and causing the side plates of the heat exchanger 92 to rust, thereby extending the service life of the heat exchanger 92.

[0086] Please refer to Figures 6 and 11 together. The opening size of the heat exchange rear cavity 132 is set to decrease in the direction from the overlapping boss 612 to the air outlet 15. Such a setting can, firstly, improve the wind speed efficiency of the air outlet of the embodiment of the present application, and secondly, make the height of the air outlet 15 slightly higher than the height of the bottom wall of the heat exchange cavity 13, which can prevent water from being trapped in the air outlet and prevent the condensed water generated at the air outlet 15 from easily dripping into the room. In some embodiments, the bottom wall of the heat exchange rear cavity 132 is set in an arc surface, and the bottom wall of the heat exchange rear cavity 132 extends upward in the direction from the overlapping boss 612 to the air outlet 15. The arc surface structure has less wind resistance to the airflow, better diversion effect, and can also reduce noise. Optionally, in other embodiments, the bottom wall of the heat exchange rear cavity 132 can also be set in an inclined surface. In some embodiments, a water storage groove 621, a drain pipe 622 and a water pump mounting block 623 are provided in the drainage portion 62, wherein the drain pipe 622 is located in the water storage groove 621. Since the bottom wall of the water receiving groove 611 is inclined downward toward the drainage portion 62, the water in the water receiving groove 611 can be guided into the drainage portion 62. A water storage groove 621 is added to the drainage portion 62, so that the water in the drainage portion 62 flows into the water storage groove 621, thereby improving the drainage efficiency of the drain pipe 622. The water pump mounting block 623 can facilitate the installation of a fixed water pump on the drainage portion 62.

[0087] As shown in Figures 8 and 9, in some embodiments, the second shell 30 further includes a pipe portion 35, which connects the drain portion 62 and one end of the diffuser chamber lower shell 50 in the longitudinal direction. The pipe portion 35 is provided with a through hole 353, which is configured to allow the refrigerant pipe of the heat exchanger 92 to pass through, facilitating the connection of the refrigerant pipe of the heat exchanger 92 with the external unit. The through hole 353 can be a long hole, which facilitates the adjustment of the position of the refrigerant pipe and the installation of refrigerant pipes of different sizes. Among them, the pipe portion 35, the diffuser chamber lower shell 50, and the drain portion 62 are an integrally formed structure. Such a configuration effectively improves production efficiency and assembly efficiency, and can also greatly reduce the number of parts and reduce logistics costs. In some embodiments, the pipe portion 35 includes a first connecting plate 351 that is connected to the drainage portion 62 and the side of the diffuser chamber lower shell 50 and is horizontally arranged, and a second connecting plate 352 that is provided on the first connecting plate 351 and is vertically arranged, wherein the through hole 353 is provided on the first connecting plate 351, and the second connecting plate 352 is located on one side of the through hole 353 and away from one end of the water receiving tray 60, and the second connecting plate 352 is connected to the side of the diffuser chamber lower shell 50. During installation, the first connecting plate 351 forms a horizontal bearing portion at one end close to the fan chamber 11, and the second connecting plate 352 forms a supporting portion at one end close to the fan chamber 11. The side panel 70 is relatively fixed on the horizontal bearing portion and the supporting portion, which can facilitate the installation and fixation of the second shell 30 and the side panel 70, and also facilitate fixation during installation.

[0088] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: the second shell 30 is obtained by injection molding the lower shell 50 of the diffuser chamber, the water receiving tray 60 and the pipe portion 35 as one piece, thereby achieving the advantages of high production efficiency, reduced mold use, and lower production costs. It is also convenient to install and fix the volute 40, heat exchanger 92, electrical control box assembly 93, water pump and other components, with high space utilization, making the product structure simpler and more compact, and the fan chamber 11, the diffuser chamber 12 and the heat exchange chamber 13 are more harmoniously connected to each other, making the air flow and guidance in the air duct smoother.

[0089] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings under the application concept of the present application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. An air duct assembly is applied to an air conditioning device, and the air conditioning device includes a fan and a heat exchanger, wherein, The air duct assembly includes a first housing and a second housing. The first housing and the second housing cooperate to define a connected diffuser chamber, a heat exchange chamber, and an air outlet communicating with the heat exchange chamber. The diffuser chamber is configured to communicate with the air outlet side of the fan, and the heat exchange chamber is configured to accommodate the heat exchanger; The second housing includes a diffuser chamber lower housing and a water receiving tray connected to each other. The diffuser chamber lower housing defines the bottom wall of the diffuser chamber, and the water receiving tray defines the bottom wall of the heat exchange chamber; Wherein, the diffuser chamber lower housing and the water receiving tray are integrally formed members.

2. The air duct assembly according to claim 1, wherein, The diffuser chamber lower housing and the water receiving tray are smoothly transitioned at the connection between the diffuser chamber and the heat exchange chamber.

3. The air duct assembly according to claim 1, wherein, The diffuser chamber lower housing is inclined upward in a direction away from the water receiving tray. The first housing and a side of the diffuser chamber lower housing away from the water receiving tray further define a fan chamber communicating with the diffuser chamber, and the fan chamber is configured to accommodate the fan; The first housing and the second housing cooperate to define an air return opening communicating with the fan chamber, and at least part of the air return opening faces downward.

4. The air duct assembly according to claim 3, wherein, The second housing further includes a fan chamber front housing connected to a side of the diffuser chamber lower housing away from the water receiving tray. The first housing includes a fan chamber rear housing. The fan chamber front housing and the fan chamber rear housing define the fan chamber and the air return opening; A first downstream end of the fan chamber front housing and a second downstream end of the fan chamber rear housing are flush with each other in the horizontal direction, and the air return opening is disposed below the fan; or The first downstream end of the fan chamber front housing and the second downstream end of the fan chamber rear housing are not flush with each other in the horizontal direction, so that at least part of the air return opening is located in front of or behind the fan.

5. The air duct assembly according to claim 4, wherein, It further includes a volute tongue, and the volute tongue is fixed at the transition joint between the fan chamber front housing and the diffuser chamber lower housing.

6. The air duct assembly according to claim 1, wherein, The air outlet faces in the horizontal direction.

7. The air duct assembly according to any one of claims 1 to 6, wherein, The water receiving tray includes a water receiving portion and a drainage portion connected to each other. The water receiving portion is configured to carry the heat exchanger and is connected to the diffuser chamber lower housing. The water receiving portion forms a water receiving groove with an upward opening, and the drainage portion is disposed on one side of the water receiving portion and communicates with the water receiving groove; Wherein, the bottom wall of the water receiving groove is inclined downward in a direction towards the drainage portion.

8. The air duct assembly according to claim 7, wherein, The second housing further includes a pipe routing portion, and the pipe routing portion connects the drainage portion and a side portion of the diffuser chamber lower housing. A through hole for the refrigerant pipe of the heat exchanger to pass through is formed on the pipe routing portion; Wherein, the pipe routing portion, the diffuser chamber lower housing, and the drainage portion are of an integral structure.

9. The air duct assembly according to claim 7, wherein, A lapping boss protrudes from the bottom wall of the water receiving groove. The lapping boss is configured to carry the heat exchanger and cooperate with the heat exchanger to divide the heat exchange chamber into a pre-heat exchange chamber and a post-heat exchange chamber. The pre-heat exchange chamber communicates with the diffuser chamber; the post-heat exchange chamber communicates with the air outlet; Wherein, the opening size of the post-heat exchange chamber is decreased in a direction from the lapping boss to the air outlet.

10. The air duct assembly according to claim 9, wherein, The bottom wall of the post-heat exchange chamber is arranged in an arc shape, and the bottom wall of the post-heat exchange chamber extends upward in a direction from the lapping boss to the air outlet.

11. An air conditioning device, wherein, It includes a fan, a heat exchanger and the air duct assembly according to any one of claims 1 to 10. The air outlet side of the fan is communicated with the diffuser chamber, and the heat exchanger is arranged in the heat exchange chamber.

12. The air conditioning device according to claim 11, wherein, The heat exchanger is arranged in an arc shape, and the number of refrigerant pipes in the middle of the heat exchanger is more than that on both sides of the heat exchanger; Wherein, the central axis of the diffuser chamber penetrates through the middle of the heat exchanger.

13. The air conditioning device according to claim 11, wherein, It further includes an electric control box assembly, and the electric control box assembly is arranged on the lower side of the lower shell of the diffuser chamber; Wherein, at least part of the air return opening is arranged on the front side of the fan and is spaced from the electric control box assembly.

14. The air conditioning device according to claim 13, wherein, It further includes an air duct interface, and the air duct interface is connected to the first shell and / or the second shell and is located between the side of the water receiving tray close to the lower shell of the diffuser chamber and the side of the first shell away from the water receiving tray; Wherein, the air duct interface is arranged in a surrounding manner below the air return opening and the electric control box assembly.

15. The air conditioning device according to claim 11, wherein, The fan is a cross-flow impeller.

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