Air duct assembly, indoor unit and heating and ventilation system

Abstract

The utility model provides an air duct assembly, an indoor unit and a heating and ventilation system. The air duct assembly comprises a fan cavity and a diffusion cavity which communicate with each other, the fan cavity is used for containing a fan, and the fan cavity comprises a first wall face and a second wall face which are oppositely arranged in the first direction; in the first direction, the first wall surface is far away from the diffusion cavity relative to the second wall surface; the fan cavity further comprises two third wall faces oppositely arranged in the second direction, the third wall faces are connected with the first wall face and the second wall face, the bottom of the first wall face, the bottom of the second wall face and the bottoms of the two third wall faces jointly define an air suction opening, the fan cavity is provided with a volute throat, and the first wall face is located below the volute throat; the first wall face is provided with a ventilation structure, and the ventilation structure is communicated with the fan cavity and the external air environment. According to the technical scheme, the vortex intensity can be weakened, the influence of vortexes is reduced, the air supply efficiency can be improved, pneumatic noise is reduced, and the user experience is improved.

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 and a heating and ventilation system. Background Art

[0002] The HVAC system includes an indoor unit, which has an air duct assembly for forming an air duct. A related art air duct assembly includes a fan chamber and a diffuser chamber that are connected to each other. The fan chamber is used to accommodate a fan. When the fan is running, it can suck external air into the fan chamber to form an airflow. The diffuser chamber is used to receive the airflow blown from the fan chamber and diffuse the airflow to increase the pressure of the airflow, thereby improving the cooling or heating effect.

[0003] In the related art, the fan cavity has a snail throat, and the airflow entering the fan cavity from the outside tends to form vortices near the snail throat. The vortices will cause the air supply efficiency of the fan to decrease and will also produce more obvious aerodynamic noise, which will greatly affect the user experience. Utility Model Content

[0004] The embodiments of the present application provide an air duct assembly, an indoor unit and a HVAC system, which are intended to improve air supply efficiency and reduce noise.

[0005] In a first aspect, an embodiment of the present application provides an air duct assembly for an indoor unit, the indoor unit comprising a fan, the air duct assembly comprising a fan cavity and a diffuser cavity that are interconnected, the fan cavity being used to accommodate the fan, the fan cavity comprising a first wall surface and a second wall surface that are arranged opposite to each other along a first direction; along the first direction, the first wall surface is farther away from the diffuser cavity than the second wall surface;

[0006] The fan cavity further includes two third walls arranged opposite to each other along a second direction, the third walls connecting the first wall and the second wall, the first wall, the second wall and the bottoms of the two third walls jointly defining an air suction port, the fan cavity having a snail throat, and the first wall being located below the snail throat;

[0007] Wherein, the first wall surface is provided with a ventilation structure, and the ventilation structure connects the fan cavity with the external air environment.

[0008] In some embodiments, the ventilation structure is constructed as a single ventilation opening, and the ventilation opening extends along the second direction.

[0009] In some of the embodiments, the ventilation structure includes a plurality of through holes arranged along the second direction.

[0010] In some embodiments, the plurality of through holes are arranged at equal intervals, and the sizes of the through holes along the second direction are equal.

[0011] In some embodiments, a dimension of the through hole along the second direction is greater than or equal to 0.5 cm and less than or equal to 1 cm.

[0012] In some embodiments, the interval between two adjacent through holes is greater than or equal to 0.4 cm and less than or equal to 1.5 cm.

[0013] In some embodiments, a length of the ventilation structure along the second direction is greater than or equal to 60% of a length of the air suction port along the second direction.

[0014] In some embodiments, the fan chamber further includes an upper wall surface, the upper wall surface is connected to the first wall surface, and the connection position between the upper wall surface and the first wall surface forms the volute throat.

[0015] In some of the embodiments, the upper wall surface is a streamlined wall surface.

[0016] In some embodiments, the height of the ventilation structure is greater than or equal to 50% of the height of the first wall surface, and less than or equal to 95% of the height of the first wall surface.

[0017] In some embodiments, the height of the ventilation structure is greater than or equal to 70% of the height of the first wall.

[0018] In some of the embodiments, the air duct assembly includes a first shell and a second shell, and the first shell and the second shell jointly define the fan cavity and the diffuser cavity; the first shell includes a cover body and two side panels, and the inner wall surfaces of the side panels are formed as the third wall surface, and the cover body includes a fan cavity rear shell, a fan cavity upper shell and a diffuser cavity upper shell connected in sequence, and the inner wall surface of the fan cavity rear shell is formed as the first wall surface, and the inner wall surface of the fan cavity upper shell is formed as the upper wall surface.

[0019] In some of the embodiments, the fan chamber rear shell, the fan chamber upper shell and the diffuser chamber upper shell are an integral structure; the side panels and the cover body are an integral structure, or the side panels are detachably connected to the cover body.

[0020] In some embodiments, the second shell includes a fan chamber front shell and a diffuser chamber lower shell connected in sequence, and the inner wall surface of the fan chamber front shell forms the second wall surface.

[0021] In some of the embodiments, the fan chamber front shell and the diffuser chamber lower shell are an integrated structure.

[0022] In some embodiments, the height of the second wall is smaller than the height of the first wall, so that the bottom of the second wall is higher than the bottom of the first wall.

[0023] In some of the embodiments, the air duct assembly further includes a protective net, which is detachably mounted on the fan cavity, and the protective net covers the air inlet.

[0024] In some embodiments, the protective net includes a first protective part and a second protective part connected to each other, the second protective part is perpendicular to the first protective part, the second protective part abuts against the bottom of the second wall, and the second protective part is arranged parallel to the first wall, and the first protective part abuts against the first wall and the two third walls.

[0025] In some of the embodiments, the air duct assembly also includes a protective net, which is connected to the fan cavity and covers the side of the fan facing the air intake port and the ventilation structure, and the opposite sides of the protective net are respectively engaged with the fan cavity.

[0026] In some of the embodiments, the air duct assembly also includes a heat exchange chamber, which is connected to the pressure diffuser chamber, and the heat exchange chamber is used to accommodate a chamber heat exchanger; the air duct assembly includes a first shell and a second shell, and the first shell and the second shell jointly define the fan chamber, the pressure diffuser chamber and the heat exchange chamber; the second shell includes a fan chamber front shell, a pressure diffuser chamber lower shell and a water receiving pan connected in sequence, and the water receiving pan is used to receive condensed water from the heat exchanger.

[0027] In a second aspect, an embodiment of the present application provides an indoor unit, which includes the air duct assembly in any of the above embodiments.

[0028] In some of the embodiments, the fan is a cross-flow fan.

[0029] In a third aspect, an embodiment of the present application provides a HVAC system, which includes an outdoor unit and an indoor unit in any of the above embodiments, and the indoor unit and the outdoor unit form a refrigerant cycle.

[0030] The air duct assembly, indoor unit and HVAC system provided by the embodiment of the present application are provided with a ventilation structure on the first wall surface, so that when the fan is working, a part of the external air enters the fan cavity through the air inlet, and the other part of the external air enters the fan cavity through the ventilation structure on the first wall surface. The airflow entering the fan cavity through the ventilation structure can improve the flow field between the snail throat and the air inlet, and compensate for the pressure near the snail throat. Thus, the vortex intensity can be weakened, and the influence of the vortex can be reduced, so as to improve the air supply efficiency and reduce the aerodynamic noise, so as to improve the user experience. In addition, the external air enters the fan cavity through the air inlet and the ventilation structure on the first wall surface at the same time, and the air intake flow rate can be increased when the fan speed remains unchanged, which is beneficial to improve the cooling or heating effect of the indoor unit. Alternatively, the fan speed can be reduced while keeping the air intake flow rate unchanged, which is beneficial to reduce the noise when the fan is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the three-dimensional structure of the indoor unit provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the three-dimensional structure of the indoor unit provided in an embodiment of the present application from another perspective;

[0034] Figure 3 A cross-sectional schematic diagram of an indoor unit provided in an embodiment of the present application;

[0035] Figure 4 It is a schematic diagram of fluid simulation at a local position of an indoor unit in the related art when it is working;

[0036] Figure 5 A schematic diagram of fluid simulation at a local position of the indoor unit provided in an embodiment of the present application when it is working;

[0037] Figure 6 An exploded schematic diagram of an indoor unit provided in an embodiment of the present application;

[0038] Figure 7 A schematic diagram of the structure of the first shell provided in an embodiment of the present application;

[0039] Figure 8 A schematic diagram of the structure of the second housing provided in an embodiment of the present application;

[0040] Fig. 9A schematic diagram of the internal structure of an indoor unit provided in an embodiment of the present application;

[0041] Fig.10 A schematic diagram of the structure of a protective net provided in an embodiment of the present application;

[0042] Fig.11 A schematic diagram of the internal structure of another indoor unit provided in an embodiment of the present application.

[0043] Description of reference numerals:

[0044] 1. Indoor unit;

[0045] 10. Air duct assembly; 11. Fan cavity; 111. First wall surface; 112. Second wall surface; 113. Third wall surface; 114. Upper wall surface; 12. Pressure diffusion cavity; 13. Heat exchange cavity; 14. Air inlet; 15. Air outlet; 16. Ventilation structure; 161. Through hole; 162. Blocking part; 163. Ventilation hole;

[0046] 20. First housing; 21. Cover; 211. Fan chamber rear housing; 212. Fan chamber upper housing; 213. Diffuser chamber upper housing; 22. Side panels;

[0047] 30. Second housing; 31. Front housing of fan chamber; 32. Lower housing of pressure diffuser chamber; 33. Water receiving tray;

[0048] 40. protection net; 41. first protection part; 42. second protection part;

[0049] 50. Snail throat;

[0050] 60. Fan;

[0051] 70. Heat exchanger. DETAILED DESCRIPTION

[0052] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0053] The HVAC system includes an indoor unit, which has an air duct assembly for forming an air duct. A related art air duct assembly includes a fan chamber and a diffuser chamber that are connected to each other. The fan chamber is used to accommodate a fan. When the fan is running, it can suck external air into the fan chamber to form an airflow. The diffuser chamber is used to receive the airflow blown from the fan chamber and diffuse the airflow to increase the pressure of the airflow, thereby improving the cooling or heating effect.

[0054] In the related art, the fan cavity has a snail throat, and the airflow entering the fan cavity from the outside tends to form vortices near the snail throat. The vortices will cause the air supply efficiency of the fan to decrease and will also produce more obvious aerodynamic noise, which will greatly affect the user experience.

[0055] In order to solve the above-mentioned technical problems, an embodiment of the first aspect of the present application provides an air duct assembly 10, which aims to improve air supply efficiency and reduce noise.

[0056] like Figure 1 , Figure 2 as well as Figure 3 As shown, the air duct assembly 10 is used for an indoor unit 1, wherein the indoor unit 1 includes a fan 60. Specifically, the air duct assembly 10 includes a fan chamber 11 and a diffuser chamber 12 that are interconnected. The fan chamber 11 is used to accommodate the fan 60. The fan chamber 11 includes a first wall 111 and a second wall 112 that are relatively arranged along a first direction; along the first direction, the first wall 111 is farther away from the diffuser chamber 12 than the second wall 112. The fan chamber 11 also includes two third walls 113 that are relatively arranged along a second direction, the third wall 113 connects the first wall 111 and the second wall 112, the second direction is perpendicular to the first direction, the first wall 111, the second wall 112 and the bottom of the two third walls 113 jointly define an air inlet 14, and the fan chamber 11 has a volute 50, and the first wall 111 is located below the volute 50. The first wall surface 111 is provided with a ventilation structure 16 , and the ventilation structure 16 connects the fan chamber 11 with the external air environment.

[0057] Combination Figure 4 and Figure 5 , Figure 4 It is a schematic diagram of fluid simulation at a local position of an indoor unit in the related art when it is working; Figure 5 The fluid simulation diagram of the local position of the indoor unit provided in the embodiment of the present application during operation is shown in FIG. Figure 4 and Figure 5 It can be seen from the comparison that when the ventilation structure 16 is provided, the vortex intensity between the volute throat 50 and the air inlet 14 (the area circled in red in the figure) is significantly weakened.

[0058] The air duct assembly 10 in the embodiment of the present application is provided with a ventilation structure 16 on the first wall surface 111, so that when the fan 60 is working, a part of the external air enters the fan cavity 11 through the air inlet 14, and another part of the external air enters the fan cavity 11 through the ventilation structure 16 on the first wall surface 111. The airflow entering the fan cavity 11 through the ventilation structure 16 can improve the flow field between the snail throat 50 and the air inlet 14, and compensate for the pressure at the position close to the snail throat 50, thereby weakening the vortex intensity and reducing the influence of the vortex, thereby improving the air supply efficiency, and reducing the aerodynamic noise, so as to improve the user experience.

[0059] In addition, the external air enters the fan chamber 11 through the air inlet and the ventilation structure 16 on the first wall 111 at the same time, and the air flow rate can be increased when the speed of the fan 60 remains unchanged, which is beneficial to improving the cooling or heating effect of the indoor unit 1. Alternatively, the speed of the fan 60 can be reduced while keeping the air flow rate unchanged, which is beneficial to reducing the noise when the fan 60 is running.

[0060] In some of the embodiments, Figure 7 As shown, the ventilation structure 16 is constructed as a single vent 163, and the vent 163 extends along the second direction. In this embodiment, the ventilation structure 16 is constructed as a single vent 163, and when the fan 60 is working, the external air enters the fan chamber 11 through the air inlet 14 and the vent 163. Since there is no structure blocking the airflow in the single vent 163, the ventilation structure 16 has a relatively large ventilation area. In this case, the improvement effect of the flow field is the best. When the speed of the fan 60 remains unchanged, the air intake flow rate can be maximized, thereby significantly improving the cooling or heating effect of the indoor unit 1.

[0061] In some other embodiments, Figure 1 , Figure 6 As shown, the ventilation structure 16 includes a plurality of through holes 161 arranged along the second direction. In this embodiment, the ventilation structure 16 includes a plurality of through holes 161 arranged along the second direction, that is, the plurality of through holes 161 together constitute the ventilation structure 16, and a blocking portion 162 is formed between adjacent through holes 161. When the fan 60 is working, the external air enters the fan chamber 11 through the air inlet 14 and the plurality of through holes 161. The blocking portion 162 between the through holes 161 can block a human hand, so that a human hand cannot touch the fan 60 through the ventilation structure 16, which can eliminate safety hazards and improve the safety of the air duct assembly 10. In addition, the blocking portion 162 can also block external objects, so that external objects cannot contact the fan 60 through the ventilation structure 16, so that the fan 60 can also be protected from being damaged by the impact of external splashes.

[0062] Furthermore, the plurality of through holes 161 are arranged at equal intervals, and the sizes of the through holes 161 along the second direction are equal. This arrangement can improve the distribution uniformity of the airflow entering the fan cavity 11 through the ventilation structure 16 in the second direction.

[0063] In one of the embodiments, the size of the through hole 161 along the second direction is greater than or equal to 0.5 cm and less than or equal to 1 cm. In order to improve the safety of the air duct assembly 10, the size of the through hole 161 along the second direction can be less than or equal to 1 cm. In this way, under normal circumstances, it can be ensured that a person's fingers cannot be inserted into the through hole 161 to avoid safety hazards. In addition, if the size of the through hole 161 along the second direction is too small, the ventilation area of ​​the ventilation structure 16 will be smaller, thereby reducing the improvement effect on the flow field. Therefore, in this embodiment, the size of the through hole 161 along the second direction is greater than or equal to 0.5 cm and less than or equal to 1 cm, which can not only make the air duct assembly 10 highly safe to use, but also make the ventilation structure 16 have a larger ventilation area, thereby having a better improvement effect on the flow field.

[0064] In one of the embodiments, the interval between two adjacent through holes 161 is greater than or equal to 0.4 cm and less than or equal to 1.5 cm. If the interval between the through holes 161 is too small, the structural strength of the air duct assembly 10 will be reduced, causing the air duct assembly 10 to be easily deformed locally. If the interval between the through holes 161 is too large, the ventilation area of ​​the ventilation structure 16 will be smaller, thereby reducing the improvement effect on the flow field. Therefore, in this embodiment, the interval between two adjacent through holes 161 is greater than or equal to 0.4 cm and less than or equal to 1.5 cm. After a large number of tests and verifications, it can be ensured that the structural strength of the air duct assembly 10 meets the requirements of long-term use and a good improvement effect on the flow field is ensured.

[0065] In some embodiments, the length of the ventilation structure 16 along the second direction is greater than or equal to 60% of the length of the air inlet 14 along the second direction. It can be understood that the air inlet 14 is the main air inlet of the fan chamber 11, and the ventilation structure 16 on the first wall 111 is an auxiliary air inlet, which is used to improve the flow field near the volute 50 and increase the air flow rate of the air duct assembly 10. A large number of studies have shown that making the length of the ventilation structure 16 along the second direction greater than or equal to 60% of the length of the air inlet 14 along the second direction has a more significant effect on improving the flow field and can significantly reduce aerodynamic noise.

[0066] In some embodiments, Figure 3As shown, the fan chamber 11 also includes an upper wall surface 114, which is connected to the first wall surface 111, and the connection position between the upper wall surface 114 and the first wall surface 111 forms a volute 50. It can be understood that the upper wall surface 114 defines the top wall of the fan chamber 11, and the airflow flows along the upper wall surface 114 after entering the fan chamber 11, and then enters the diffuser chamber 12. Among them, the volute 50 is formed at the connection position between the upper wall surface 114 and the first wall surface 111, and the ventilation structure 16 is arranged on the first wall surface 111, thereby, the airflow entering the fan chamber 11 through the ventilation structure 16 can better improve the flow field, so as to compensate for the pressure near the position of the volute 50, thereby reducing the vortex intensity. Among them, the first wall surface 111 and the second wall surface 112 can be straight walls.

[0067] In some embodiments, the upper wall surface 114 is a streamlined wall surface. Such a configuration allows the airflow to maintain a laminar flow state during the flow along the upper wall surface 114, thereby facilitating the reduction of energy loss.

[0068] In some embodiments, the height of the ventilation structure 16 is greater than or equal to 70% of the height of the first wall surface 111. With such a configuration, the ventilation structure 16 can have a relatively large ventilation area, thereby facilitating the improvement of the convection field and significantly reducing the eddy current intensity. In addition, the air intake flow rate can also be significantly increased, thereby significantly improving the cooling or heating effect of the indoor unit 1.

[0069] In some embodiments, Figure 2 , Figure 3 and Figure 6 As shown, the air duct assembly 10 includes a first shell 20 and a second shell 30, and the first shell 20 and the second shell 30 jointly define a fan cavity 11 and a diffuser cavity 12. The first shell 20 includes a cover 21 and two side panels 22, and the inner wall surface of the side panels 22 is formed as a third wall surface 113. The cover 21 includes a fan cavity rear shell 211, a fan cavity upper shell 212 and a diffuser cavity upper shell 213 connected in sequence, and the inner wall surface of the fan cavity rear shell 211 is formed as a first wall surface 111, and the inner wall surface of the fan cavity upper shell 212 is formed as an upper wall surface 114.

[0070] The air duct assembly 10 includes a first shell 20 and a second shell 30, that is, the first shell 20 and the second shell 30 can be manufactured and formed separately, and then the manufactured first shell 20 and the second shell 30 are connected to define the fan cavity 11 and the diffuser cavity 12. Before the first shell 20 and the second shell 30 are connected, the fan 60 can be assembled with the first shell 20 or the second shell 30, so that the assembly difficulty of the fan 60 can be reduced and the installation accuracy of the fan 60 can be improved.

[0071] The first housing 20 includes a cover 21 and two side panels 22. The side panels 22 and the cover 21 may be an integrally formed structure, or may be formed separately and then connected by fasteners (such as screws, rivets, etc.). The cover 21 includes a fan cavity rear shell 211, a fan cavity upper shell 212, and a diffuser cavity upper shell 213 connected in sequence. When the first housing 20 and the second housing 30 are assembled, the inner wall surface of the fan cavity rear shell 211 is formed as a first wall surface 111, the inner wall surface of the fan cavity upper shell 212 is formed as an upper wall surface 114, and the inner wall surface of the side panels 22 is formed as a third wall surface 113.

[0072] Specifically, the first shell 20 and the second shell 30 can be metal parts, so that they can have higher structural strength and structural rigidity, so that the air duct assembly 10 is not prone to structural damage and deformation. Alternatively, the first shell 20 and the second shell 30 can also be plastic parts, so that they can have a lighter weight. The specific selection can be based on actual use requirements, and this application does not limit this.

[0073] Furthermore, the fan cavity rear shell 211, the fan cavity upper shell 212 and the diffuser cavity upper shell 213 are an integrated structure. For example, when the cover 21 is made of metal, the cover 21 can be formed by metal extrusion process, sheet metal process, etc., thereby processing the fan cavity rear shell 211, the fan cavity upper shell 212 and the diffuser cavity upper shell 213 presenting an integrated structure; when the cover 21 is made of plastic material, the cover 21 can be formed by injection molding process to process the fan cavity rear shell 211, the fan cavity upper shell 212 and the diffuser cavity upper shell 213 presenting an integrated structure.

[0074] In addition, the side panel 22 and the cover body can be an integrated structure, or the side panel 22 can be detachably connected to the cover body, the former is conducive to reducing assembly procedures, and the latter can reduce processing difficulty. In specific production practice, it can be selected according to actual needs.

[0075] In some embodiments, Figure 8 As shown, the second housing 30 includes a fan chamber front housing 31 and a diffuser chamber lower housing 32 connected in sequence, and the inner wall surface of the fan chamber front housing 31 is formed as a second wall surface 112. When the first housing 20 and the second housing 30 are assembled, the fan chamber upper housing 212, the fan chamber rear housing 211, the side panel 22 and the fan chamber front housing 31 are combined to form a fan chamber 11, and the diffuser chamber upper housing 213 and the diffuser chamber lower housing 32 are combined to form a diffuser chamber 12. Among them, the inner wall surface of the fan chamber front housing 31 is formed as a second wall surface 112 arranged opposite to the first wall surface 111.

[0076] Furthermore, the fan chamber front shell 31 and the diffuser chamber lower shell 32 may be an integrated structure, which is helpful to reduce the assembly process and thus improve the assembly efficiency of the indoor unit 1.

[0077] It should be noted that the first shell 20 and the second shell 30 can act as a shell, so there is no need to set up other structures such as shells, which is conducive to reducing the volume of the air duct assembly 10, thereby realizing the miniaturization of the indoor unit 1 to adapt to the use environment with a relatively compact installation space. Of course, in other embodiments, the indoor unit 1 may also include a shell, and the shell may be configured to cover the outside of the first shell 20 and the second shell 30, so as to protect the first shell 20 and the second shell 30.

[0078] In some embodiments, Figure 3 As shown, the height of the second wall 112 is less than the height of the first wall 111, so that the bottom of the second wall 112 is higher than the bottom of the first wall 111. When the bottom of the second wall 112 is higher than the bottom of the first wall 111, the air inlet area of ​​the air suction port 14 can be increased, thereby, when the speed of the fan 60 remains unchanged, the air inlet flow rate of the air duct assembly 10 can be further increased, thereby further improving the cooling or heating effect.

[0079] In some embodiments, Figure 6 , Fig. 9 as well as Fig.10 As shown, the air duct assembly 10 further includes a protective net 40, which is detachably mounted on the fan cavity 11, and covers the air inlet 14. By providing the protective net 40 that covers the air inlet 14, the fan 60 can be protected by the protective net 40 while ensuring that the air outside the air inlet 14 can enter the fan cavity 11 through the air inlet 14. In addition, it can also prevent a person's hand from accidentally reaching into the fan cavity 11, thereby eliminating the potential safety hazard caused by a person's hand contacting the fan 60.

[0080] In one embodiment, Fig. 9 , Fig.10 As shown, the protective net 40 includes a first protective part 41 and a second protective part 42 which are connected to each other. The second protective part 42 is perpendicular to the first protective part 41, and the second protective part 42 abuts against the bottom of the second wall 112. The second protective part 42 is arranged parallel to the first wall 111, and the first protective part 41 abuts against the first wall 111 and the two third walls 113.

[0081] The second protective portion 42 is perpendicular to the first protective portion 41, which makes the protective net 40 as a whole L-shaped, so that the first protective portion 41 can abut against the first wall 111 and the two third walls 113, and the second protective portion 42 can abut against the bottom of the second wall 112, thereby, the entire air intake port 14 can be covered by the protective net 40, thereby effectively protecting the fan 60.

[0082] In another embodiment, Fig.11 As shown, the air duct assembly 10 further includes a protective net 40, which is connected to the fan cavity 11 and covers the side of the fan 60 facing the air inlet 14 and the ventilation structure 16, and the opposite sides of the protective net 40 are respectively snap-fitted with the fan cavity 11. In this embodiment, the protective net 40 covers the side of the fan 60 facing the air inlet 14 and the ventilation structure 16, so that the protective net 40 covers a larger range of the fan 60, and can not only protect the side of the fan 60 facing the air inlet 14, but also protect the side of the fan 60 facing the ventilation structure 16. In addition, the protective net 40 is connected to the fan cavity 11 by snap-fitting on both sides, so that the installation and removal process of the protective net 40 is more convenient.

[0083] In some embodiments, Figure 3 , Figure 6 As shown, the air duct assembly 10 further includes a heat exchange chamber 13, which is connected to the pressure diffuser chamber 12, and the heat exchange chamber 13 is used to accommodate the chamber heat exchanger 70. After the external air enters the air duct assembly 10 through the air inlet 14 under the action of the fan 60, it passes through the fan chamber 11, the pressure diffuser chamber 12 and the heat exchange chamber 13 in sequence, and exchanges heat with the heat exchanger 70 located in the heat exchange chamber 13 when passing through the heat exchange chamber 13, so that the heat exchanger 70 is used to cool or heat the airflow, and the airflow after cooling or heating flows out from the exhaust port 15 of the air duct assembly 10 to adjust the temperature of the indoor environment.

[0084] Furthermore, the air duct assembly 10 includes a first shell 20 and a second shell 30, and the first shell 20 and the second shell 30 jointly define a fan chamber 11, a pressure diffuser chamber 12 and a heat exchange chamber 13. The second shell 30 includes a fan chamber front shell 31, a pressure diffuser chamber lower shell 32 and a water receiving pan 33 connected in sequence, and the water receiving pan 33 is used to receive condensed water from the heat exchanger 70. Since the heat exchanger 70 will inevitably generate condensed water when working, the second shell 30 also includes a water receiving pan 33, and the water receiving pan 33 can be located below the heat exchanger 70, so that the condensed water generated by the heat exchanger 70 can be received and collected by the water receiving pan 33, thereby preventing the condensed water from spreading.

[0085] Furthermore, if Figure 3 As shown, the heat exchanger 70 can be roughly V-shaped, thereby increasing the heat exchange area and improving the heat exchange efficiency. In addition, the heat exchanger 70 and the exhaust port 15 of the air duct assembly 10 can be arranged directly opposite each other, so that after the airflow exchanges heat with the heat exchanger 70, it flows to the exhaust port 15 through a shorter path, thereby reducing the energy loss of the airflow during the flow process.

[0086] In some embodiments, Figure 6As shown, the air duct assembly 10 further includes a heat-insulating layer 80, which is disposed on the wall surface of the heat exchange cavity 13. In this way, by providing the heat-insulating layer 80, it is helpful to maintain the temperature in the heat exchange cavity 13 and prevent heat from being dissipated outward through the wall surface of the heat exchange cavity 13. Specifically, the heat-insulating layer 80 can be heat-insulating cotton, foam or heat-insulating glue.

[0087] The embodiment of the second aspect of the present application provides an indoor unit 1, which includes the air duct assembly 10 in any of the above embodiments. The indoor unit 1 includes but is not limited to a duct unit, a wall-mounted air conditioner indoor unit 1, a vertical air conditioner indoor unit 1 and other structural forms. Among them, the duct unit is usually installed on the ceiling using a suspended ceiling and can be hidden in the ceiling, so that the duct unit has a better hiding effect than other structural forms of the indoor unit 1. In addition, the duct unit adopts a decentralized air outlet, and the user can get a more comfortable experience.

[0088] The indoor unit 1 in the embodiment of the present application and the air duct assembly 10 in the above embodiment are based on the same application concept, so the indoor unit 1 in the embodiment of the present application can obtain all the beneficial effects of the air duct assembly 10 in the above embodiment.

[0089] In some embodiments, the fan 60 is a cross-flow fan, which has the advantages of small radial size, low noise, uniform air output, etc. In addition, the cross-flow fan can be arbitrarily lengthened or shortened in its axial direction without affecting the flow state of the airflow, and has a more flexible design space.

[0090] The embodiment of the third aspect of the present application provides a HVAC system, which includes an outdoor unit and an indoor unit 1 in any of the above embodiments, and the indoor unit 1 forms a refrigerant cycle with the outdoor unit. The HVAC system includes but is not limited to air conditioning, multi-split units, heat pump systems, etc. The HVAC system can be used in large-scale places such as shopping malls and office buildings. Among them, the HVAC system may include an indoor unit 1, an outdoor unit and a connecting pipe, and the indoor unit 1 is connected to the outdoor unit through a connecting pipe so that the indoor unit 1 and the outdoor unit form a refrigerant cycle. In some actual use scenarios, the indoor unit 1 can be installed indoors, and the outdoor unit can be installed outdoors. The outdoor unit is responsible for cooling or heating, and transports the refrigerant through the connecting pipe. The refrigerant is heat exchanged with the indoor air and the outdoor air respectively, and the indoor unit 1 is responsible for transporting cold air or hot air to the room to achieve the effect of cooling or heating.

[0091] The HVAC system in the embodiment of the present application and the indoor unit 1 in the above embodiment are based on the same application concept. Therefore, the HVAC system in the embodiment of the present application can obtain all the beneficial effects of the indoor unit 1 in the above embodiment.

[0092] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0093] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0094] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0095] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0097] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An air duct assembly for an indoor unit, the indoor unit comprising a fan, characterized in that: The air duct assembly comprises a fan cavity and a diffuser cavity which are interconnected, the fan cavity is used to accommodate the fan, and the fan cavity comprises a first wall surface and a second wall surface which are arranged opposite to each other along a first direction; along the first direction, the first wall surface is farther away from the diffuser cavity than the second wall surface; The fan cavity further includes two third walls arranged opposite to each other along a second direction, the third walls connecting the first wall and the second wall, the first wall, the second wall and the bottoms of the two third walls jointly defining an air suction port, the fan cavity having a snail throat, and the first wall being located below the snail throat; Wherein, the first wall surface is provided with a ventilation structure, and the ventilation structure connects the fan cavity with the external air environment.

2. The air duct assembly according to claim 1, characterized in that: The ventilation structure is configured as a single ventilation opening, and the ventilation opening extends along the second direction.

3. The air duct assembly according to claim 1, characterized in that: The ventilation structure includes a plurality of through holes arranged along the second direction.

4. The air duct assembly according to claim 3, characterized in that: The plurality of through holes are arranged at equal intervals, and the sizes of the through holes along the second direction are equal.

5. The air duct assembly according to claim 4, characterized in that: The size of the through hole along the second direction is greater than or equal to 0.5 cm and less than or equal to 1 cm; And / or, the interval between two adjacent through holes is greater than or equal to 0.4 cm and less than or equal to 1.5 cm.

6. The air duct assembly according to any one of claims 2 to 4, characterized in that: The length of the ventilation structure along the second direction is greater than or equal to 60% of the length of the air suction port along the second direction.

7. The air duct assembly according to claim 1, characterized in that: The fan chamber further includes an upper wall surface, which is connected to the first wall surface, and the connection position between the upper wall surface and the first wall surface forms the volute throat.

8. The air duct assembly according to claim 7, characterized in that: The upper wall surface is a streamlined wall surface.

9. The air duct assembly according to claim 7, characterized in that: The height of the ventilation structure is greater than or equal to 50% of the height of the first wall surface, and less than or equal to 95% of the height of the first wall surface.

10. The air duct assembly according to claim 8, characterized in that: The height of the ventilation structure is greater than or equal to 70% of the height of the first wall surface.

11. The air duct assembly according to claim 7, characterized in that: The air duct assembly includes a first shell and a second shell, wherein the first shell and the second shell jointly define the fan cavity and the diffuser cavity; The first shell includes a cover body and two side panels, the inner wall surface of the side panels forms the third wall surface, the cover body includes a fan chamber rear shell, a fan chamber upper shell and a diffuser chamber upper shell connected in sequence, the inner wall surface of the fan chamber rear shell forms the first wall surface, and the inner wall surface of the fan chamber upper shell forms the upper wall surface.

12. The air duct assembly according to claim 11, characterized in that: The fan chamber rear shell, the fan chamber upper shell and the diffuser chamber upper shell are an integrated structure; The side panel and the cover body are an integrated structure, or the side panel is connected to the cover body in a detachable manner.

13. The air duct assembly according to claim 11, characterized in that: The second shell includes a fan chamber front shell and a diffuser chamber lower shell which are connected in sequence, and the inner wall surface of the fan chamber front shell forms the second wall surface.

14. The air duct assembly according to claim 13, characterized in that: The fan chamber front shell and the diffuser chamber lower shell are an integrated structure.

15. The air duct assembly according to claim 1, characterized in that: The height of the second wall surface is smaller than that of the first wall surface, so that the bottom of the second wall surface is higher than the bottom of the first wall surface.

16. The air duct assembly according to claim 15, characterized in that: The air duct assembly also includes a protective net, which is detachably mounted on the fan cavity, and the protective net covers the air inlet.

17. The air duct assembly according to claim 16, characterized in that: The protection net includes a first protection part and a second protection part connected to each other, the second protection part is perpendicular to the first protection part, the second protection part abuts against the bottom of the second wall, and the second protection part is arranged parallel to the first wall, and the first protection part abuts against the first wall and the two third walls.

18. The air duct assembly according to claim 1, characterized in that: The air duct assembly also includes a protective net, which is connected to the fan cavity and covers the side of the fan facing the air intake port and the ventilation structure, and the opposite sides of the protective net are respectively engaged with the fan cavity.

19. The air duct assembly according to claim 1, characterized in that: The air duct assembly further comprises a heat exchange cavity, the heat exchange cavity is communicated with the pressure diffusion cavity, and the heat exchange cavity is used to accommodate a cavity heat exchanger; The air duct assembly comprises a first shell and a second shell, wherein the first shell and the second shell jointly define the fan cavity, the pressure diffuser cavity and the heat exchange cavity; The second shell includes a fan chamber front shell, a diffuser chamber lower shell and a water receiving pan which are connected in sequence, and the water receiving pan is used to receive condensed water from the heat exchanger.

20. An indoor unit, characterized in that: The invention comprises the air duct assembly according to any one of claims 1 to 19.

21. The indoor unit according to claim 20, characterized in that: The fan is a cross-flow fan.

22. A HVAC system, characterized in that: It comprises an outdoor unit and the indoor unit according to claim 20 or 21, wherein the indoor unit and the outdoor unit form a refrigerant cycle.

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