Indoor unit and heating and ventilation system

Abstract

The utility model provides an indoor unit and a heating and ventilation system. The indoor unit comprises an air duct assembly, the air duct assembly comprises a draught fan cavity, the air duct assembly is further provided with an air suction opening communicating with the draught fan cavity, and the air suction opening is located in the bottom of the draught fan cavity; the draught fan is arranged in the draught fan cavity; the switching structure is detachably connected with the air duct assembly, the switching structure is located below the fan cavity, an airflow channel is defined in the switching structure, the switching structure is provided with a first ventilation opening and a second ventilation opening, and the first ventilation opening and the second ventilation opening communicate with the airflow channel. The first ventilation opening is in butt joint with the air suction opening, and the orientation of the second ventilation opening is different from that of the air suction opening. Therefore, the installation requirements under the two conditions that the air return pipe is arranged and the air return pipe is not arranged can be met.

Description

Technical Field

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

[0002] The HVAC system includes an indoor unit. In the related art, an indoor unit is installed on the ceiling, and the ceiling has an air outlet and a return air outlet. The air outlet of the indoor unit is connected to the air outlet, so that the indoor unit can deliver refrigerated or heated air to the indoor space through the air outlet. In addition, the air inlet of the indoor unit is connected to the return air outlet, so that the fan can inhale the return air in the indoor space through the return air outlet, thereby forming an air flow circulation between the indoor space and the indoor unit.

[0003] The indoor unit can be set up in different ways depending on the distance between the indoor unit and the return air outlet. When the indoor unit is close to the return air outlet, the air inlet of the indoor unit can be directly opposite to the return air outlet. When the indoor unit is far from the return air outlet, a return air duct needs to be set between the air inlet and the return air outlet of the indoor unit. The direction of the air inlet of the indoor unit will be different in the two cases where the return air duct is required and the return air duct is not required, which makes it difficult for the same indoor unit to meet the installation requirements in both cases. Utility Model Content

[0004] The embodiments of the present application provide an indoor unit and a HVAC system, which are intended to meet the installation requirements of both situations where a return air duct is set and where no return air duct is set.

[0005] In a first aspect, an embodiment of the present application provides an indoor unit, the indoor unit comprising:

[0006] An air duct assembly, the air duct assembly comprising a fan cavity, the air duct assembly further being provided with an air suction port communicated with the fan cavity, the air suction port being located at the bottom of the fan cavity;

[0007] a fan, the fan being disposed in the fan cavity; and

[0008] A transition structure, wherein the transition structure is connected to the air duct assembly in a detachable manner, the transition structure is located below the fan cavity, an air flow channel is defined within the transition structure, the transition structure has a first vent and a second vent connected to the air flow channel, the first vent is docked with the suction port, and the second vent is oriented in a direction different from that of the suction port.

[0009] In some of the embodiments, the air duct assembly further includes a pressure diffuser chamber and a heat exchange chamber, the fan chamber, the pressure diffuser chamber and the heat exchange chamber are arranged along a first direction, the pressure diffuser chamber is located between the heat exchange chamber and the fan chamber, and the pressure diffuser chamber is connected to the fan chamber and the heat exchange chamber; the indoor unit further includes a heat exchanger, which is arranged in the heat exchange chamber; the air duct assembly is also provided with an exhaust port connected to the heat exchange chamber, and the exhaust port is located on the side of the heat exchange chamber away from the pressure diffuser chamber.

[0010] In some embodiments, the direction of the second vent is opposite to the direction of the exhaust port.

[0011] In some of the embodiments, the direction of the air intake port is perpendicular to the direction of the air exhaust port.

[0012] In some embodiments, the transfer structure includes: a top plate; a bottom plate, the top plate and the bottom plate are spaced apart, and a front plate, the front plate is connected to the bottom plate; and two side plates, the two side plates are relatively arranged along a second direction, the top plate, the bottom plate and the front plate are all connected to the side plates, and the second direction is perpendicular to the first direction; wherein the front end of the top plate, the top end of the front plate and the top ends of the two side plates jointly define the first vent, and the rear end of the top plate, the rear end of the bottom plate and the rear ends of the two side plates jointly define the second vent.

[0013] In some of the embodiments, a circular arc transition structure is provided at the connection position between the front plate and the bottom plate.

[0014] In some of the embodiments, a limiting flange is disposed on the adapter structure, and the limiting flange is located outside the air flow channel and is disposed around the second vent.

[0015] In some embodiments, there is a distance between the end surface of the second vent and the limiting flange.

[0016] In some embodiments, the distance between the end surface of the second vent and the limiting flange is greater than or equal to 3 cm and less than or equal to 10 cm.

[0017] In some embodiments, the air duct assembly also includes a diffuser chamber connected to the fan chamber, and the fan chamber and the diffuser chamber are arranged along a first direction; the fan chamber includes a first wall and a second wall arranged opposite to each other along the first direction; along the first direction, the first wall is farther away from the diffuser chamber than the second wall; the fan chamber also includes two third walls arranged opposite to each other along the second direction, the third wall connects the first wall and the second wall, the first wall, the second wall and the bottom of the two third walls jointly define an air suction port, the fan chamber has a volute throat, the first wall is located below the volute throat, and the second direction is perpendicular to the first direction; wherein the first wall is provided with a ventilation structure, and the air suction port and the ventilation structure are both covered by the first ventilation port, so that the air suction port and the ventilation structure are both connected to the air flow channel.

[0018] In some embodiments, the ventilation structure includes a plurality of through holes arranged along the second direction; or, the ventilation structure is constructed as a single ventilation opening, and the ventilation opening extends along the second direction.

[0019] In some of the 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; the upper wall surface is a streamlined wall surface.

[0020] 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.

[0021] 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.

[0022] 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.

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

[0024] In some of the embodiments, the indoor unit further includes a protective net, which is connected to the air duct assembly 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 air duct assembly.

[0025] In some of the embodiments, the fan is a cross-flow fan.

[0026] In a second aspect, an embodiment of the present application provides a HVAC system, which includes an outdoor unit and an indoor unit in any one of the above embodiments, and the indoor unit and the outdoor unit form a refrigerant cycle.

[0027] The indoor unit and HVAC system provided in the embodiment of the present application are provided with a transfer structure connected to the air duct assembly in a detachable manner, the first vent of the transfer structure is docked with the air suction port of the air duct assembly, and the second vent of the transfer structure is in a different direction from the air suction port. When the indoor unit does not need to be connected to the return air duct, the transfer structure can be omitted, so that the air suction port of the indoor unit is directly arranged opposite to the return air port of the ceiling, and at this time, the air suction port is the air inlet of the indoor unit. When the indoor unit is far away from the return air port of the ceiling, the air duct assembly needs to be installed with a transfer structure, and then the return air duct is connected through the transfer structure so that the return air duct is docked with the second vent of the transfer structure, and at this time, the second vent is the air inlet of the indoor unit. It can be seen that the direction of the air inlet of the indoor unit is different when the transfer structure is not installed and when the transfer structure is installed, thereby meeting the installation requirements of both the return air duct and the return air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 A schematic diagram of the three-dimensional structure of an indoor unit provided in one embodiment of the present application;

[0030] Figure 2 A schematic diagram of the three-dimensional structure of an indoor unit provided in an embodiment of the present application (when the transfer structure is removed);

[0031] Figure 3 A cross-sectional schematic diagram of an indoor unit provided in an embodiment of the present application (when the transfer structure is removed);

[0032] Figure 4 A schematic diagram of the structure of a switching structure provided in one embodiment of the present application;

[0033] Figure 5 A schematic diagram of the three-dimensional structure of an indoor unit provided in another embodiment of the present application (when the transfer structure is removed);

[0034] Figure 6 for Figure 5 An exploded schematic diagram of the indoor unit shown;

[0035] Figure 7 A schematic diagram of the three-dimensional structure of an indoor unit provided in another embodiment of the present application;

[0036] Figure 8 A schematic diagram of the structure of a second housing provided in one embodiment of the present application;

[0037] Fig. 9 A schematic diagram of the internal structure of an indoor unit provided in an embodiment of the present application (when the transfer structure is removed);

[0038] Fig.10 A schematic diagram of the internal structure of an indoor unit provided in another embodiment of the present application (when the transfer structure is removed).

[0039] Description of reference numerals:

[0040] 1. Indoor unit;

[0041] 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;

[0042] 20. First housing; 21. Cover; 211. Fan chamber rear housing; 212. Fan chamber upper housing; 213. Diffuser chamber upper housing; 22. Side panels;

[0043] 30. Second housing; 31. Front housing of fan chamber; 32. Lower housing of pressure diffuser chamber;

[0044] 40. Protective net;

[0045] 50. Snail throat;

[0046] 60. Fan;

[0047] 70. Heat exchanger;

[0048] 80. Transfer structure; 81. First vent; 82. Second vent; 83. Top plate; 84. Bottom plate; 85. Front plate; 86. Side plate; 87. Arc transition structure; 88. Limit flange; 89. Air flow channel. DETAILED DESCRIPTION

[0049] 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.

[0050] The HVAC system includes an indoor unit. In the related art, an indoor unit is installed on the ceiling, and the ceiling has an air outlet and a return air outlet. The air outlet of the indoor unit is connected to the air outlet, so that the indoor unit can deliver refrigerated or heated air to the indoor space through the air outlet. In addition, the air inlet of the indoor unit is connected to the return air outlet, so that the fan can inhale the return air in the indoor space through the return air outlet, thereby forming an air flow circulation between the indoor space and the indoor unit.

[0051] The indoor unit can be set up in different ways depending on the distance between the indoor unit and the return air outlet. When the indoor unit is close to the return air outlet, the air inlet of the indoor unit can be directly opposite to the return air outlet. When the indoor unit is far from the return air outlet, a return air duct needs to be set between the air inlet and the return air outlet of the indoor unit. The direction of the air inlet of the indoor unit will be different in the two cases where the return air duct is required and the return air duct is not required, which makes it difficult for the same indoor unit to meet the installation requirements in both cases.

[0052] In order to solve the above technical problems, an embodiment of the first aspect of the present application provides an indoor unit, which is intended to simultaneously meet the installation requirements of both cases where a return air duct is set and where no return air duct is set.

[0053] like Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, the indoor unit 1 includes an air duct assembly 10, a fan 60 and a switching structure 80. Specifically, the air duct assembly 10 includes a fan cavity 11, and the air duct assembly 10 is also provided with an air suction port 14 connected to the fan cavity 11, the air suction port 14 is located at the bottom of the fan cavity 11, and the fan 60 is arranged in the fan cavity 11. The switching structure 80 is connected to the air duct assembly 10 in a detachable manner, the switching structure 80 is located below the fan cavity 11, and the interior of the switching structure 80 defines an air flow channel 89, and the switching structure 80 has a first vent 81 and a second vent 82 connected to the air flow channel 89, the first vent 81 is connected to the air suction port 14, and the direction of the second vent 82 is different from that of the air suction port 14.

[0054] The indoor unit 1 in the embodiment of the present application is provided with a transfer structure 80 connected to the air duct assembly 10 in a detachable manner, the first vent 81 of the transfer structure 80 is docked with the air suction port 14 of the air duct assembly 10, and the second vent 82 of the transfer structure 80 is in a different direction from the air suction port 14. When the indoor unit 1 does not need to be connected to the return air duct, the transfer structure 80 can be omitted, so that the air suction port 14 of the indoor unit 1 is directly arranged opposite to the return air port of the ceiling. At this time, the air suction port 14 is the air inlet of the indoor unit 1. When the indoor unit 1 is far away from the return air port of the ceiling, the air duct assembly 10 needs to be installed with the transfer structure 80, and then the return air duct is connected through the transfer structure 80, so that the return air duct is docked with the second vent 82 of the transfer structure 80. At this time, the second vent 82 is the air inlet of the indoor unit 1. It can be seen that the orientation of the air inlet of the indoor unit 1 is different when the adapter structure 80 is not installed and when the adapter structure 80 is installed, thereby meeting the installation requirements of both cases where a return air duct is set and where a return air duct is not set.

[0055] Specifically, the adapter structure 80 can be connected to the air duct assembly 10 by screws, or by buckles, so that the adapter structure 80 is easy to be assembled and disassembled from the air duct assembly 10. Of course, in other embodiments, the adapter structure 80 can also be connected to the air duct assembly 10 in other detachable ways.

[0056] In some embodiments, Figure 3 As shown, the air duct assembly 10 further includes a pressure diffuser chamber 12 and a heat exchange chamber 13, the fan chamber 11, the pressure diffuser chamber 12 and the heat exchange chamber 13 are arranged along a first direction, the pressure diffuser chamber 12 is located between the heat exchange chamber 13 and the fan chamber 11, and the pressure diffuser chamber 12 is connected to the fan chamber 11 and the heat exchange chamber 13. The indoor unit 1 further includes a heat exchanger 70, which is disposed in the heat exchange chamber 13. The air duct assembly 10 is also provided with an exhaust port 15 connected to the heat exchange chamber 13, and the exhaust port 15 is located on the side of the heat exchange chamber 13 away from the pressure diffuser chamber 12.

[0057] When the fan 60 is working, it can suck the external air through the air inlet 14, so that the external air enters the fan chamber 11 to form an airflow. The pressure diffuser chamber 12 can receive the airflow blown from the fan chamber 11 and diffuse the airflow to increase the pressure of the airflow. The airflow after the pressure diffusion enters the heat exchange chamber 13 and exchanges heat with the heat exchanger 70 in the heat exchange chamber 13, so that the heat exchanger 70 is used to cool or heat the airflow. The airflow after the temperature is cooled or heated flows out through the air outlet 15 to adjust the temperature of the indoor environment.

[0058] In some embodiments, Figure 1 , Figure 3As shown, the direction of the second vent 82 is opposite to that of the exhaust port 15. With such a configuration, when the adapter structure 80 is installed, the indoor unit 1 forms a front air outlet and rear air return operation mode, which can better adapt to application scenarios where the ceiling return air port and the air outlet are far apart. If necessary, an exhaust duct can be connected between the exhaust port 15 of the indoor unit 1 and the ceiling air outlet.

[0059] Furthermore, the direction of the air inlet 14 can be perpendicular to the direction of the air outlet 15, that is, the air inlet 14 can be set downward. Therefore, when the adapter structure 80 is not installed, the indoor unit 1 is in the working mode of front air outlet and bottom air return. When the adapter structure 80 is installed, the indoor unit 1 is in the working mode of front air outlet and rear air return. Thus, the indoor unit 1 can better adapt to different application scenarios.

[0060] In some embodiments, Figure 4 As shown, the transfer structure 80 includes a top plate 83, a bottom plate 84, a front plate 85 and two side plates 86, the top plate 83 and the bottom plate 84 are arranged at intervals, the front plate 85 is connected to the bottom plate 84, and the two side plates 86 are arranged relatively along the second direction, the top plate 83, the bottom plate 84 and the front plate 85 are all connected to the side plates 86, and the second direction is perpendicular to the first direction, wherein the front end of the top plate 83, the top end of the front plate 85 and the top ends of the two side plates 86 jointly define a first vent 81, and the rear end of the top plate 83, the rear end of the bottom plate 84 and the rear ends of the two side plates 86 jointly define a second vent 82. Among them, for the indoor unit 1, the first direction can be regarded as the front-to-back direction, and the second direction can be regarded as the left-to-right direction.

[0061] In this way, a switching structure 80 can be constructed with the first vent 81 facing upward and the second vent 82 facing backward. In this way, after the switching structure 80 is installed, the indoor unit 1 can be changed from a working mode of front air outlet and lower air return to a working mode of front air outlet and rear air return.

[0062] Furthermore, if Figure 4 As shown, the connection position of the front plate 85 and the bottom plate 84 can be provided with an arc transition structure 87, which has a guiding effect on the airflow. In this way, when the airflow changes its flow direction in the airflow channel 89 of the transition structure 80, the energy loss can be reduced.

[0063] In some embodiments, Figure 4 As shown, a limiting flange 88 is provided on the transfer structure 80, and the limiting flange 88 is located outside the air flow channel 89 and is arranged around the second vent 82. The limiting flange 88 can limit the return air duct, so that the return air duct and the transfer structure 80 can be positioned relatively quickly during the installation of the return air duct.

[0064] Furthermore, there is a distance between the end face of the second vent 82 and the limiting flange 88. In this way, the portion of the adapter structure 80 located between the end face of the second vent 82 and the limiting flange 88 can constitute a plug-in portion. When assembling with the return air duct, the port of the return air duct can be firstly put on the plug-in portion, and then the return air duct can be connected to the limiting flange 88 of the adapter structure 80 by screws, rivets, etc. This is conducive to improving the assembly efficiency of the return air duct and the adapter structure 80.

[0065] Furthermore, the distance between the end face of the second vent 82 and the limiting flange 88 is greater than or equal to 3 cm and less than or equal to 10 cm. If the above distance is too small, the port of the return air duct will be easily moved and unstable after being put on the plug-in part. If the above distance is too large, the size of the adapter structure 80 along the first direction will be larger, resulting in waste of materials. Therefore, the distance between the end face of the second vent 82 and the limiting flange 88 is set to be greater than or equal to 3 cm and less than or equal to 10 cm. Within the above range, the port of the return air duct can be more stable after being put on the plug-in part, which is also conducive to avoiding waste of materials.

[0066] In some embodiments, Figure 3 , Figure 5 as well as Figure 6 As shown, the air duct assembly 10 also includes a diffuser chamber 12 connected to the fan chamber 11, and the fan chamber 11 and the diffuser chamber 12 are arranged along the first direction. The fan chamber 11 includes a first wall 111 and a second wall 112 arranged opposite to each other along the 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 arranged opposite to each other along the second direction, the third wall 113 connects the first wall 111 and the second wall 112, and the bottoms of the first wall 111, the second wall 112 and 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. Among them, the first wall 111 is provided with a ventilation structure 16.

[0067] By arranging the ventilation structure 16 on the first wall surface 111, 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.

[0068] In addition, the external air enters the fan chamber 11 through the air inlet 14 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.

[0069] Furthermore, if Figure 7 As shown, the air inlet 14 and the ventilation structure 16 are both covered by the first ventilation opening 81, so that the air inlet 14 and the ventilation structure 16 are both connected to the air flow channel 89. That is to say, when the first wall surface 111 is provided with the ventilation structure 16, the first ventilation opening 81 of the adapter structure 80 covers the air inlet 14 and the ventilation structure 16 at the same time, so that the air inlet 14 and the ventilation structure 16 are both connected to the air flow channel 89 of the adapter structure 80.

[0070] In one embodiment, the ventilation structure 16 is constructed as a single vent, and the vent extends along the second direction. Since there is no structure blocking the airflow in the single vent, the ventilation structure 16 has a relatively large ventilation area. In this case, the improvement effect of the flow field is better. When the speed of the fan 60 remains unchanged, the air flow rate can be increased to a greater extent, thereby significantly improving the cooling or heating effect of the indoor unit 1.

[0071] like Figure 5 or Figure 6 As shown, in another embodiment, 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.

[0072] In some embodiments, Figure 3 As shown, the fan chamber 11 further includes an upper wall surface 114 , which is connected to the first wall surface 111 , and a volute 50 is formed at the connection position between the upper wall surface 114 and the first wall surface 111 , and the upper wall surface 114 is a streamlined wall surface.

[0073] 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, so that the airflow entering the fan chamber 11 through the ventilation structure 16 can better improve the flow field to compensate for the pressure near the volute 50 position, thereby reducing the vortex intensity. Among them, the first wall surface 111 and the second wall surface 112 can be straight walls.

[0074] In addition, the upper wall surface 114 is a streamlined wall surface. Such a configuration allows the airflow to maintain a laminar flow state during the process of flowing along the upper wall surface 114, thereby facilitating the reduction of energy loss.

[0075] In some embodiments, Figure 3 , 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] In addition, the side panel 22 and the cover body 21 are an integrated structure, or the side panel 22 is detachably connected to the cover body 21. 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.

[0080] 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.

[0081] In some embodiments, Figure 6 , Fig. 9 As shown, the indoor unit 1 further includes a protective net 40, which is detachably mounted on the air duct assembly 10, and the protective net 40 covers the air inlet 14. By providing the protective net 40 that covers the air inlet 14, the air outside the air inlet 14 can be ensured to enter the fan cavity 11 through the air inlet 14, and the protective net 40 can be used to protect the fan 60. 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.

[0082] In some other embodiments, Fig.10As shown, the indoor unit 1 further includes a protective net 40, which is connected to the air duct assembly 10 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 engaged with the air duct assembly 10. 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 air duct assembly 10 in a way of being engaged on both sides, so that the installation and removal process of the protective net 40 is more convenient.

[0083] 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.

[0084] The embodiment of the second 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.

[0085] 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.

[0086] 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.

[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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 indoor unit, characterized in that: include: An air duct assembly, the air duct assembly comprising a fan cavity, the air duct assembly further being provided with an air suction port communicated with the fan cavity, the air suction port being located at the bottom of the fan cavity; A fan, wherein the fan is disposed in the fan cavity; as well as A transition structure, wherein the transition structure is connected to the air duct assembly in a detachable manner, the transition structure is located below the fan cavity, an air flow channel is defined within the transition structure, the transition structure has a first vent and a second vent connected to the air flow channel, the first vent is docked with the suction port, and the second vent is oriented in a direction different from that of the suction port.

2. The indoor unit according to claim 1, characterized in that: The air duct assembly further includes a pressure diffuser cavity and a heat exchange cavity, the fan cavity, the pressure diffuser cavity and the heat exchange cavity are arranged along a first direction, the pressure diffuser cavity is located between the heat exchange cavity and the fan cavity, and the pressure diffuser cavity is communicated with the fan cavity and the heat exchange cavity; the indoor unit further includes a heat exchanger, and the heat exchanger is arranged in the heat exchange cavity; The air duct assembly is further provided with an exhaust port communicated with the heat exchange cavity, and the exhaust port is located on a side of the heat exchange cavity away from the pressure diffusion cavity.

3. The indoor unit according to claim 2, characterized in that: The direction of the second ventilation opening is opposite to the direction of the exhaust opening.

4. The indoor unit according to claim 3, characterized in that: The direction of the air intake port is perpendicular to the direction of the air exhaust port.

5. The indoor unit according to claim 4, characterized in that: The switching structure comprises: roof; The top plate and the bottom plate are spaced apart from each other. a front plate connected to the bottom plate; and Two side panels, the two side panels are arranged opposite to each other along a second direction, the top panel, the bottom panel and the front panel are all connected to the side panels, and the second direction is perpendicular to the first direction; The front end of the top plate, the top end of the front plate and the top ends of the two side plates jointly define the first vent, and the rear end of the top plate, the rear end of the bottom plate and the rear ends of the two side plates jointly define the second vent.

6. The indoor unit according to claim 5, characterized in that: A circular arc transition structure is provided at the connection position between the front plate and the bottom plate.

7. The indoor unit according to claim 1, characterized in that: A limiting flange is arranged on the adapter structure, and the limiting flange is located outside the air flow channel and is arranged around the second vent.

8. The indoor unit according to claim 7, characterized in that: There is a distance between the end surface of the second vent and the limiting flange.

9. The indoor unit according to claim 8, characterized in that: The distance between the end surface of the second vent and the limiting flange is greater than or equal to 3 cm and less than or equal to 10 cm.

10. The indoor unit according to any one of claims 1 to 9, characterized in that: The air duct assembly further includes a pressure diffuser cavity communicated with the fan cavity, and the fan cavity and the pressure diffuser cavity are arranged along a first direction; The fan cavity comprises a first wall surface and a second wall surface which are arranged opposite to each other along the first direction; along the first direction, the first wall surface is farther away from the pressure 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, the first wall being located below the snail throat, and the second direction being perpendicular to the first direction; Wherein, the first wall surface is provided with a ventilation structure, and the air suction port and the ventilation structure are both covered by the first ventilation port, so that the air suction port and the ventilation structure are both connected to the air flow channel.

11. The indoor unit according to claim 10, characterized in that: The ventilation structure comprises a plurality of through holes arranged along the second direction; Alternatively, the ventilation structure is constructed as a single ventilation opening, and the ventilation opening extends along the second direction.

12. The indoor unit according to claim 10, characterized in that: The fan cavity 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; the upper wall surface is a streamlined wall surface.

13. The indoor unit according to claim 12, 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.

14. The indoor unit according to claim 13, 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.

15. The indoor unit according to claim 13, 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.

16. The indoor unit according to claim 10, characterized in that: The indoor unit further comprises a protective net which is detachably mounted on the air duct assembly and covers the air inlet.

17. The indoor unit according to claim 10, characterized in that: The indoor unit also includes a protective net, which is connected to the air duct assembly and covers the side of the fan facing the air inlet and the ventilation structure, and the opposite sides of the protective net are respectively engaged with the air duct assembly.

18. The indoor unit according to any one of claims 1 to 9, characterized in that: The fan is a cross-flow fan.

19. A HVAC system, characterized in that: The invention comprises an outdoor unit and the indoor unit according to any one of claims 1 to 18, wherein the indoor unit and the outdoor unit form a refrigerant cycle.

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