Indoor unit and heating and ventilation system

Abstract

The utility model discloses an indoor unit and a heating and ventilation system. The indoor unit comprises a shell, a fan and a protective net, and the shell is provided with an air duct and an air return port communicating with the air duct; the fan is arranged in the air duct and is adjacent to the air return port; and the protective net is detachably connected with the shell and covers the side, facing the air return opening, of the fan, the two opposite sides of the protective net are connected with the two opposite sides of the shell in a clamped mode correspondingly, and according to the technical scheme, the protective net in the indoor unit is convenient to disassemble, assemble and maintain.

Description

Technical Field

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

[0002] The indoor unit is usually installed on the ceiling in a suspended manner, and only the return air outlet of the indoor unit is exposed. In order to prevent debris from being drawn into the fan of the indoor unit from the return air outlet, or to prevent users from accidentally touching the fan during operation, a fan protection net is usually installed at the return air outlet to cover the return air outlet area.

[0003] In the related art, the wind turbine protection net is usually fixed to the shell structure by threaded components such as bolts or screws. This connection method requires pre-positioning and related tools to tighten the threaded components, and the assembly steps are complicated. Utility Model Content

[0004] The embodiments of the present application provide an indoor unit and a HVAC system, which can simplify the installation process of the fan protection net and improve the assembly efficiency.

[0005] In the first aspect, an embodiment of the present application provides an indoor unit, including a shell, a fan and a protective net, the shell is provided with an air duct and a return air outlet connected to the air duct, the fan is arranged in the air duct and adjacent to the return air outlet, the protective net is detachably connected to the shell, and covers a side of the fan facing the return air outlet, wherein the opposite sides of the protective net are respectively engaged with the opposite sides of the shell.

[0006] In a possible implementation, the housing includes a first housing and a second housing, and the first housing and the second housing cooperate to form an air duct and an air return port;

[0007] A clamping column is arranged on one side of the protective net, a clamping hole is arranged on the first shell, and the clamping column passes through the clamping hole;

[0008] A buckle is arranged on the other side of the protective net, and a buckle hole is arranged on the second shell body, and the buckle is buckled in the buckle hole.

[0009] In a possible implementation, the protective net includes a frame;

[0010] The clamping column comprises two sub-clamping columns which are arranged at a relatively interval and connected to the frame, a deformation space is formed between the two sub-clamping columns, and the two sub-clamping columns can be moved closer to or farther from each other to be elastically tensioned on the clamping hole.

[0011] In a possible implementation, the sub-card column includes a column and a cap body, the column is connected to the frame, and the cap body is connected to one end of the column away from the frame, wherein the column is inserted into the card hole, and the cap body abuts against the outer wall surface of the first shell.

[0012] In a possible implementation, the clamping column further includes a supporting rib, which is located in the deformation space and has two ends respectively connected to the two sub-clamping columns.

[0013] In a possible implementation, the frame is formed with a avoidance groove recessed toward the inside of the protective net, the sub-card column is connected to the bottom wall of the avoidance groove, and partially extends out of the notch of the avoidance groove.

[0014] In a possible implementation, the protective net further includes connecting ribs, and two ends of the connecting ribs are respectively connected to the sub-pin and the side wall of the avoidance groove.

[0015] In one possible implementation, the protective net includes a frame, the frame includes a base portion and a limiting portion that are connected to each other, the buckle is connected to the base portion and is arranged relatively spaced apart from the limiting portion, the buckle, the base portion and the limiting portion cooperate to form a limiting space, and the limiting space is used for embedding part of the structure of the second shell.

[0016] In a possible implementation, the frame further includes a holding portion, which is connected to the base portion and extends in a direction opposite to the limiting portion;

[0017] The buckle comprises a clamping section and an operating section respectively extending toward opposite sides of the base part; the clamping section and the limiting part are arranged at a relative interval; and the operating section and the holding part are arranged at a relative interval.

[0018] In a possible implementation, the frame further includes a clamping portion, which is connected to the base portion and spaced relative to the limiting portion, and the clamping portion and the limiting portion are used to respectively limit and abut against two opposite surfaces of the second shell.

[0019] In a possible implementation, a heat exchanger and an electric control box are further included, the air duct includes a fan cavity, a pressure diffusion cavity and a heat exchange cavity which are connected in sequence, the fan cavity is connected to the return air port, the fan is located in the fan cavity, and the heat exchanger is located in the heat exchange cavity;

[0020] The electric control box is located on the lower surface of the second shell corresponding to the fan cavity and is arranged adjacent to the return air outlet. The clamping position of the protective net and the second shell is located between the fan and the electric control box.

[0021] In one possible implementation, the second shell includes a diffuser lower shell and a guide plate that form the bottom wall of the diffuser chamber. The diffuser lower shell is inclined from top to bottom in the direction from the fan chamber to the heat exchange chamber. The guide plate is connected to the side of the diffuser lower shell close to the fan chamber and is provided with buckle holes. The electrical control box is installed on the lower surface of the diffuser lower shell.

[0022] In one possible implementation, an installation cavity is formed on the bottom surface of the shell between the fan cavity and the heat exchange cavity, the electric control box is installed in the installation cavity, and the projections of the protective net and the electric control box on the plane where the cavity opening of the installation cavity is located do not overlap.

[0023] In a possible implementation, the protection net includes a plurality of protection parts connected in sequence, and the plurality of protection parts are arranged at angles to each other.

[0024] In a possible implementation, the protection portion includes a first protection portion and a second protection portion;

[0025] The first protection part is located between the lower part of the fan and the electric control box; the second protection part is located on a side of the fan close to the return air outlet;

[0026] Wherein, the first protection portion is perpendicular to the plane where the cavity opening of the installation cavity is located; and / or,

[0027] The second protection portion is parallel to a plane where the cavity opening of the installation cavity is located.

[0028] In a possible implementation, the protection part includes a first protection part, a second protection part, and a third protection part connected in sequence; the first protection part is clamped with the second shell, and the first protection part is located between the lower part of the fan and the electric control box; the third protection part is clamped with the first shell, and the third protection part is located on a side of the fan close to the return air outlet;

[0029] The angle between the first protection part and the second protection part and the angle between the third protection part and the second protection part are both obtuse angles;

[0030] Wherein, the first protection portion is perpendicular to the plane where the cavity opening of the installation cavity is located; and / or,

[0031] The third protection portion is parallel to a plane where the cavity opening of the installation cavity is located.

[0032] In a possible implementation, the protective net is arranged in an arc shape, and the distance between the protective net and the electric control box gradually increases in the direction toward the cavity opening of the installation cavity.

[0033] Based on the indoor unit provided in the embodiment of the present application, the opposite sides of the protective net are respectively clamped with the opposite sides of the shell. Compared with the form of installing the protective net and the shell by using threaded parts such as threads or bolts, the present application does not require additional installation tools and connectors, has lower maintenance costs and higher installation efficiency.

[0034] In a second aspect, an embodiment of the present application provides a HVAC system, comprising the above-mentioned indoor unit and outdoor unit, wherein the outdoor unit pipeline is connected to the indoor unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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 the structures shown in these drawings without paying any creative work.

[0036] Figure 1 A schematic diagram of the structure of the indoor unit provided in an embodiment of the present application, located at a first viewing angle;

[0037] Figure 2 A front view of the indoor unit provided in an embodiment of the present application;

[0038] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0039] Figure 4 An exploded view of the indoor unit provided in an embodiment of the present application;

[0040] Figure 5 A schematic diagram of the structure of the indoor unit provided in the embodiment of the present application at a second viewing angle;

[0041] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0042] Figure 7 This is a schematic diagram of the assembly of the protective net, top cover, guide plate and diffuser lower shell;

[0043] Figure 8 for Figure 6 A partial enlarged view of point C in the middle;

[0044] Fig. 9 A schematic diagram of the structure of the first protective net provided in the embodiment of the present application;

[0045] Fig.10 for Fig. 9 A partial enlarged view of point D in the middle;

[0046] Fig.11 for Fig. 9 A partial enlarged view of point E in the middle;

[0047] Fig.12 A schematic diagram of the structure of the second protective net provided in an embodiment of the present application.

[0048] Description of Figure Numbers:

[0049] 1. Indoor unit; 10. Shell; 11. Fan cavity; 12. Diffuser cavity; 13. Heat exchange cavity; 14. Return air outlet; 15. Air outlet; 16. Installation cavity; 20. First shell; 21. Clamp hole; 22. Top cover; 30. Second shell; 91. Fan; 40. Protective net; 41. Frame; 411. Avoidance groove; 412. Base; 413. Limiting part; 414. Holding part; 415. Clamping part; 42. Protective strip; 43. Through hole; 44. Clamping column; 4 41. Sub-column; 4411. Column; 4412. Cap body; 442. Support rib; 45. Buckle; 451. Snap-on section; 452. Operation section; 46. Connecting rib; 47. Protective part; 471. First protective part; 472. Second protective part; 473. Third protective part; 48. Limiting space; 50. Diffuser lower shell; 52. Guide plate; 521. Buckle hole; 60. Water tray; 70. Side panel; 91. Fan; 92. Heat exchanger; 93. Electric control box.

[0050] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0051] In order to make the objectives, technical solutions and advantages of the present application clearer, the following part will further describe the embodiments of the present application in detail in conjunction with the accompanying drawings.

[0052] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0053] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0055] The indoor unit is usually installed on the ceiling in a suspended manner, and only the return air outlet of the indoor unit is exposed. In order to prevent debris from being drawn into the indoor unit's fan from the return air outlet, or to prevent users from accidentally touching the fan during operation, a fan protection net is usually installed at the return air outlet to cover the return air outlet area. The fan protection net is usually fixed to the shell structure by threaded components such as bolts or screws. This connection method requires pre-positioning and related tools to tighten the threaded components, and the assembly steps are complicated.

[0056] The embodiment of the present application proposes an indoor unit 1 and a HVAC system. It can be understood that the HVAC system includes an indoor unit 1 and an outdoor unit. The indoor unit 1 and the outdoor unit are connected through modules such as a circuit module and a pipe module to jointly operate to adjust the indoor environment. Figures 1 to 3 The indoor unit 1 is shown in FIG. 1 , and the indoor unit 1 includes a housing 10 , a fan 91 , a protection net 40 , a heat exchanger 92 and an electric control box 93 .

[0057] Please also read Figure 4 and Figure 5 , the shell 10 is used to form an air duct for gas flow. In some embodiments, the shell 10 includes a first shell 20 and a second shell 30. After the first shell 20 and the second shell 30 are assembled, a fan chamber 11, a pressure diffuser chamber 12 and a heat exchange chamber 13 are formed in sequence inside, as well as a return air port 14 connected to the fan chamber 11 and an air outlet 15 connected to the heat exchange chamber 13. The flow direction of the gas during operation is: entering from the return air port 14 and passing through the fan chamber 11, the pressure diffuser chamber 12 and the heat exchange chamber 13 in sequence, and finally flowing out from the air outlet 15. In some structural forms, the shell 10 can be made of sheet metal material or plastic material; it can be formed by hot pressing or injection molding, or it can be set as split parts and assembled by welding. Here, the material and manufacturing process of the shell 10 are not specifically limited.

[0058] The fan 91 is disposed in the fan chamber 11 and adjacent to the return air port 14. The fan 91 generates a negative pressure environment by rotating, sucking air from the return air port 14 and delivering it to the air duct. The fan 91 can be a cross-flow fan 91, a centrifugal fan 91, or an axial flow fan 91, etc. Figure 3In the exemplary embodiment shown in FIG. 1 , the fan 91 is a crossflow fan, which is arranged in a long cylindrical shape, with the air inlet side arranged toward the return air port 14, and the air outlet side connected to the pressure diffusion chamber 12. The crossflow fan has the advantages of small radial size, large air volume, low noise and simple installation.

[0059] The heat exchanger 92 is arranged in the heat exchange cavity 13, and is used to perform heat exchange on the gas flowing through the heat exchanger 92, so as to heat up or cool down the gas. A plurality of refrigerant pipes are arranged in the heat exchanger 92, and the refrigerant flows in the refrigerant pipes. When the gas passes through the refrigerant pipes, it exchanges heat with the refrigerant in the pipes through the pipe walls, so as to heat or cool and adjust the temperature of the air. In order to improve the heat exchange efficiency of the heat exchanger 92, the heat exchanger 92 can be arranged in an arc shape, a V shape, or a wave shape, so as to increase the contact area between the heat exchanger 92 and the air, thereby improving the heat exchange efficiency of the present application.

[0060] It should be noted that the indoor unit 1 also includes a water receiving pan 60, a volute, a pipe assembly and other structures, wherein the pipe assembly is used to realize the formation of a refrigerant circulation flow path between the indoor unit 1 and the outdoor unit, the volute is arranged in the air duct to guide the airflow, and the water receiving pan 60 is used to receive the condensed water generated during the operation of the heat exchanger 92.

[0061] like Figure 4 As shown, in some embodiments, the first shell 20 and the second shell 30 are arranged relative to each other in the upper and lower parts, for example, the first shell 20 is located above the second shell 30, and the first shell 20 includes a top cover 22 and a side panel 70, and the top cover 22 and the side panel 70 form a cover structure with an open bottom. The top cover 22, the side panel 70 and the second shell 30 are enclosed together to form an air duct. After the first shell 20 and the second shell 30 are assembled, the side panel 70 is located between the top cover 22 and the second shell 30, and is located on both sides of the air duct along the air flow direction. In some other embodiments, the first shell 20 and the second shell 30 can also be arranged relative to each other in the left and right parts, that is, the first shell 20 and the second shell 30 are spliced ​​left and right to form an air duct. Here, the present application does not limit the connection form of the first shell 20 and the second shell 30.

[0062] See also Figure 6 and Figure 7 The protective net 40 is detachably connected to the housing 10 and covers the side of the fan 91 facing the return air port 14. The protective net 40 can effectively reduce the risk of large foreign matter entering the fan cavity 11 or the risk of the user accidentally touching the fan 91 during the operation of the fan 91, thereby ensuring the normal operation of the fan 91.

[0063] The protective net 40 includes a frame 41 and a plurality of protective strips 42. The frame 41 is a frame structure with a hollow area. The two ends of the plurality of protective strips 42 are respectively connected to the inner wall surface of the frame 41, thereby defining a plurality of through holes 43 in the hollow area, and the gas can pass through the plurality of through holes 43 into the fan chamber 11. The plurality of through holes 43 are arranged at intervals and may be circular, rectangular, diamond, hexagonal, or other shapes. When the protective strips 42 are interconnected so that the protective net 40 presents a honeycomb structure, the overall structure of the protective net 40 can evenly disperse pressure and stress when subjected to force, thereby improving the strength of the structure and effectively reducing noise and vibration. In addition, the honeycomb structure can use less material and increase strength, while also making the area of ​​the through hole 43 relatively large, thereby ensuring the stability and smoothness of air circulation.

[0064] In some structural forms, the frame 41 and the plurality of protection strips 42 may be an integrated structure, which has better integrity, high connection stability, and is easy to process. During production, plastic materials (such as polypropylene, polycarbonate, polyvinyl chloride) can be used for integral molding by injection molding, or metal materials (such as iron, aluminum) and alloy materials (such as aluminum alloy, steel, stainless steel) can be used for hot pressing molding. In some other structural forms, the frame 41 and the plurality of protection strips 42 may also be split structures, connected by bolt connection or welding, etc., and the present application is not limited thereto.

[0065] Specifically, the detachable connection between the protective net 40 and the housing 10 can be that the opposite sides of the protective net 40 are respectively connected to the opposite sides of the housing 10. Compared with the form of installing the protective net 40 and the housing 10 with threaded parts such as threads or bolts, no additional installation tools and connectors are required, and the installation efficiency is higher. In order to further improve the efficiency of the connection between the protective net 40 and the housing 10, in some structural forms, please refer to Figures 6 to 8 A clamping column 44 is provided on one side of the protective net 40, and a buckle 45 is provided on the other side. A clamping hole 21 is provided on the first shell 20, and a buckle hole 521 is provided on the second shell 30. The clamping column 44 is passed through the clamping hole 21, and the buckle 45 is buckled in the buckle hole 521, so that the protective net 40 and the shell 10 are clamped together.

[0066] Please also read Fig. 9 and Fig.10In some embodiments, the clamping column 44 includes two sub-clamping columns 441, which are connected to the frame 41 and arranged at a relative interval. A deformation space is formed between the two sub-clamping columns 441, so that the two sub-clamping columns 441 can be close to or away from each other, so as to be elastically tensioned on the clamping hole 21. The sub-clamping column 441 includes a column 4411 and a cap 4412, the column 4411 is connected to the frame 41, and the cap 4412 is connected to the end of the column 4411 away from the frame 41. When the clamping column 44 is clamped and fixed to the clamping hole 21, the caps 4412 of the two sub-clamping columns 441 pass through the clamping hole 21 and abut against the outer wall surface of the first shell 20, and the column 4411 is penetrated through the clamping hole 21. In this way, the clamping operation of the clamping column 44 and the first shell 20 can be completed. Of course, in some other embodiments, the clamping column 44 may also include only one column 4411 and multiple caps 4412, and the multiple caps 4412 are connected to the end of the column 4411 away from the frame 41, and are in an "umbrella" shape, and can be opened and closed relative to the column 4411. When the clamping column 44 is clamped and fixed with the clamping hole 21, the multiple caps 4412 pass through the clamping hole 21 in a closed state and abut against the outer wall surface of the first shell 20 in an open state. Here, the specific structure of the clamping column 44 is not limited in this application. It can be understood that the number of the clamping columns 44 can be set to at least two, and they are connected to the frame 41 at intervals, so that the stability of the connection between the protective net 40 and the first shell 20 can be improved.

[0067] In order to improve the stability of the deformation between the two sub-pins 441, please refer to Fig.10 The column 44 also includes a support rib 442, which is located in the deformation space and has two ends connected to the two sub-columns 441. When subjected to load, the presence of the support rib 442 can limit the deformation range between the two sub-columns 441, thereby ensuring the stability and durability of the column 44. In some connection methods, the support rib 442 is V-shaped. This arrangement can ensure that the two sub-columns 441 can be close to each other, and limit the distance between the two sub-columns 441, thereby preventing the two sub-columns 441 from exceeding the allowable deformation range, resulting in failure to work normally or even damage. In some embodiments, the number of the support ribs 442 is two. The support rib 442 connected between the two sub-columns 441 and close to one end of the cap body 4412 is V-shaped, and the support rib 442 connected between the two sub-columns 441 and away from one end of the cap body 4412 is straight. In this way, it can ensure that the cap bodies 4412 on the two sub-columns 441 can approach or move away from each other, and can also improve the stability between the two sub-columns 441.

[0068] See also Fig. 9 and Fig.12In some structural forms, the frame 41 is formed with a avoidance groove 411 that is recessed into the protective net 40, and the sub-card column 441 is connected to the bottom wall of the avoidance groove 411, and partially extends from the notch of the avoidance groove 411. In this way, the user can put his hand into the avoidance groove 411, and then the fingers apply a force from the outside of the two sub-card columns 441 to make them approach each other, so that the cap bodies 4412 on the two sub-card columns 441 can approach each other, thereby facilitating the removal of the protective net 40 and the first shell 20. It can be understood that in order to increase the friction force of the fingers fixed on the outside of the sub-card column 441, a plurality of protrusions are provided on the outside of the sub-card column 441. The present application can be disassembled without tools, and the disassembly method is simpler.

[0069] In order to further improve the deformation stability between the two sub-pins 441, please refer to Fig.10 The protective net 40 also includes a connecting rib 46, the two ends of which are respectively connected to the sub-columns 441 and the side walls of the avoidance groove 411. In this way, a supporting rib 442 is connected between the two sub-columns 441, and the outer sides of the two sub-columns 441 are respectively connected to the side walls of the avoidance groove 411 with connecting ribs 46, thereby enhancing the strength and rigidity of the two sub-columns 441, controlling their deformation range, dispersing the load, and improving the bearing capacity and safety of the structure.

[0070] Please also read Figure 7 and Fig.11 In some embodiments, the frame 41 includes a base portion 412 and a limiting portion 413 connected to each other, the buckle 45 is connected to the base portion 412 and is arranged at intervals relative to the limiting portion 413, and the buckle 45, the base portion 412 and the limiting portion 413 cooperate to form a limiting space 48, and the limiting space 48 is used for embedding a part of the structure of the second shell 30. When connected and fixed, the part of the structure of the second shell 30 is embedded in the limiting space 48, so that the buckle 45 of the protective net 40 is engaged with the buckle hole 521 of the second shell 30, so that the connection method is simple and the installation is convenient. It can be understood that the number of buckles 45 can be set to be several, and they are connected to the frame 41 at intervals, so that the stability of the connection between the protective net 40 and the second shell 30 can be improved.

[0071] In order to facilitate the disassembly operation between the buckle 45 of the protective net 40 and the buckle hole 521 of the second shell 30, as shown in FIG. Figure 7 and Fig.11As shown, the frame 41 further includes a holding portion 414, which is connected to the base portion 412 and extends in the opposite direction to the limiting portion 413. The buckle 45 includes a clamping section 451 and an operating section 452 extending toward opposite sides of the base portion 412, respectively, wherein the clamping section 451 and the limiting portion 413 are arranged relatively spaced apart, and the operating section 452 and the holding portion 414 are arranged relatively spaced apart. When connected and fixed, the clamping section 451 is clamped with the buckle hole 521. During the disassembly operation, the user fixes part of the fingers on the holding portion 414, and the other part of the fingers applies a force to the operating section 452, so that the operating section 452 moves in a direction relatively close to the holding portion 414, thereby driving the clamping section 451 to move in a direction relatively away from the limiting portion 413, and then the buckle 45 can be moved away from the buckle hole 521. It can be understood that in order to increase the friction force of fixing the finger on the holding portion 414, the holding portion 414 is provided with a protrusion for increasing the friction force in the direction toward the finger.

[0072] In order to improve the stability of the connection between the protective net 40 and the second shell 30, as shown in FIG. Fig. 9 As shown, the frame 41 also includes a clamping portion 415, which is connected to the base portion 412 and is arranged relatively spaced apart from the limiting portion 413. The clamping portion 415 and the limiting portion 413 are used to respectively limit and abut against two relative surfaces of the second shell 30, thereby improving the relative fixation stability of the protective net 40 and the second shell 30.

[0073] In some structural forms, the post 44 and the frame 41 as well as the buckle 45 and the frame 41 can be injection molded as one piece, which reduces the number of parts and the complexity of the process, and is efficient in producing the protective net 40. Compared with the form of connecting or welding multiple separate structures into one, it can reduce multiple assembly steps, eliminate the seams at the connection, and improve the strength and stability of the overall structure.

[0074] Please refer again Figure 4 The air duct is arranged to be gradually expanded along the flow direction of the gas, that is, along the direction from the pressure diffuser 12 to the heat exchange chamber 13. In this way, when the airflow in the fan chamber 11 flows through the pressure diffuser 12, part of the kinetic energy is converted into static pressure, and the flow velocity is reduced, so that sufficient heat exchange can be performed with the heat exchanger 92.

[0075] In some embodiments, the second shell 30 includes a pressure diffuser lower shell 50 and a guide plate 52 that form the bottom wall of the pressure diffuser chamber 12. In order to achieve a gradually expanding setting of the pressure diffuser chamber 12, the pressure diffuser lower shell 50 is inclined from top to bottom in the direction from the fan chamber 11 to the heat exchange chamber 13. The guide plate 52 is connected to the side of the pressure diffuser lower shell 50 close to the fan chamber 11 and is provided with a buckle hole 521. The electrical control box 93 is installed on the lower surface of the pressure diffuser lower shell 50.

[0076] It is understandable that, since the pressure diffuser lower shell 50 is inclined from top to bottom in the direction from the fan chamber 11 to the heat exchange chamber 13, between the fan chamber 11 and the heat exchange chamber 13, the pressure diffuser lower shell 50 and the bottom surface of the first shell 20 form an installation chamber 16, the electric control box 93 is installed in the installation chamber 16, and the projections of the protective net 40 and the electric control box 93 on the plane where the cavity opening of the installation chamber 16 is located do not overlap each other. It is understandable that, since the electric control box 93 needs to be disassembled and assembled through the cavity opening of the installation chamber 16, the protective net 40 located on the side of the electric control box 93 may interfere with the disassembly and assembly of the electric control box 93. In order to avoid the interference of the protective net 40 on the disassembly and assembly of the electric control box 93 to a certain extent, the relative position of the protective net 40 and the electric control box 93 can be restricted, for example, the projections of the protective net 40 and the electric control box 93 on the plane where the cavity opening of the installation chamber 16 is located do not overlap each other. In this way, the protective net 40 can be prevented from interfering with the assembly and disassembly of the electric control box 93 , thereby facilitating the assembly and disassembly of the electric control box 93 .

[0077] In this way, the installation of the electric control box 93 will not occupy the space in the air duct. In addition, the guide plate 52 is arranged between the fan chamber 11 and the electric control box 93. After one side of the protective net 40 is engaged with the guide plate 52, the protective net 40 can effectively isolate the electric control box 93 from the fan 91. In this way, during the maintenance of the indoor unit 1, it is not easy to accidentally touch the fan 91 when disassembling the electric control box 93, which is safer. In the form of installing the electric control box 93 on the lower surface of the diffuser lower shell 50, during the maintenance process, the grille at the position corresponding to the return air outlet 14 on the ceiling can be removed, and the electric control box 93 can be observed and maintained. Compared to the solution in the related art, in which the electric control box 93 is installed on the side panel 70 and two openings are required to be opened on the ceiling, the solution of the present application only requires one opening to be opened on the ceiling, the assembly process is simpler and the cost is lower, and during the maintenance process, the maintenance operations of the electric control box 93 and the fan 91 can be performed through one opening at the same time, which makes the maintenance of the indoor unit 1 more convenient.

[0078] The protective part 47 includes a first protective part 471 and a second protective part 472. The first protective part 471 is clamped with the guide plate 52, and the first protective part 471 is located between the lower part of the fan 91 and the electrical control box 93; the second protective part 472 is clamped with the first shell 20, and the second protective part 472 is located on the side of the fan 91 close to the return air outlet 14.

[0079] The first protection portion 471 is perpendicular to the plane where the cavity opening of the installation cavity 16 is located, and the second protection portion 472 is parallel to the plane where the cavity opening of the installation cavity 16 is located. In this way, the protection net 40 is easy to process and manufacture.

[0080] The guard part 47 includes a first guard part 471, a second guard part 472 and a third guard part 473 which are connected in sequence; the first guard part 471 is snap-fitted to the guide plate 52, and the first guard part 471 is located between the lower part of the fan 91 and the electric control box 93; the third guard part 473 is snap-fitted to the first shell 20, and the third guard part 473 is located on the side of the fan 91 close to the return air outlet 14; the angle between the first guard part 471 and the second guard part 472 and the angle between the third guard part 473 and the second guard part 472 are both obtuse angles.

[0081] The first protection part 471 is perpendicular to the plane where the cavity opening of the installation cavity 16 is located, and the third protection part 473 is parallel to the plane where the cavity opening of the installation cavity 16 is located. In this way, the air inlet area of ​​the installation cavity 16 is larger, which is conducive to heat dissipation of the electric control box 93.

[0082] In other embodiments, in order to avoid the high sharpness of the protective net 40, the protective net 40 can be set to an arc shape, and the distance between the protective net 40 and the electric control box 93 gradually increases in the direction toward the cavity opening of the installation cavity 16. In this way, it is possible to ensure that the wind-proof area at the air inlet of the installation cavity 16 is large, and the protective net 40 can be prevented from interfering with the disassembly and assembly of the electric control box 93, which is not only conducive to heat dissipation of the electric control box 93, but also convenient for disassembly and assembly of the electric control box 93.

[0083] Of course, in order to facilitate the removal of the protective net 40, that is, to reduce the interference of the electric control box 93 in the removal process of the protective net 40, in a structural form, the distance between the lower surface of the electric control box 93 and the lower surface of the diffuser lower shell 50 gradually decreases in the direction from the heat exchanger 92 to the fan chamber 11. The lower surface of the electric control box 93 extends obliquely upward on the side close to the protective net 40 to form an escape space, so that during the removal process of the protective net 40, that is, when releasing the connection between the buckle 45 and the buckle hole 521, the operation is more convenient.

[0084] It should be noted that the guide plate 52 can be fixed or movable.

[0085] For example, when the guide plate 52 is fixed, the installation angle with the buckle 45 can be pre-designed (for example, it can be tilted at a certain angle or can be vertically set at an angle) so that it can be better connected with the protective net 40. Thus, the guide plate 52 and the diffuser lower shell 50 are an integrated structure (for example, injection molding). In this way, the firmness of the connection between the two can be improved and the assembly steps can be reduced.

[0086] When the guide plate 52 is movable, that is, the guide plate 52 and the diffuser lower shell 50 can be set as a split structure, and the guide plate 52 and the diffuser lower shell 50 can be fixed to each other by means of installation methods such as snap-on or threaded connection. In this way, the installation position between the guide plate 52 and the diffuser lower shell 50 can be fine-tuned so that the shell 10 and the protective net 40 can be adapted for installation. For example, it can avoid the situation where the installation error causes the protection net 40 and the shell 10 to be difficult or impossible to install. In some other embodiments, the guide plate 52 can be designed with a certain elastic deformation (such as thermoplastic polyurethane, thermoplastic elastomer, acrylic-vinyl-styrene copolymer) through the design of the material so that it can be elastically swingable between the direction close to the fan cavity 11 and the direction away from the fan cavity 11. Here, the present application does not make specific restrictions.

[0087] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0088] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An indoor unit, characterized in that: include: The shell is provided with an air duct and an air return port connected to the air duct; A fan is arranged in the air duct and adjacent to the return air outlet; as well as A protective net is detachably connected to the shell and covers the side of the fan facing the return air outlet, wherein opposite sides of the protective net are respectively engaged with opposite sides of the shell.

2. The indoor unit according to claim 1, characterized in that: The housing comprises a first housing and a second housing, wherein the first housing and the second housing cooperate to form the air duct and the return air outlet; A clamping column is provided on one side of the protective net, a clamping hole is provided on the first shell, and the clamping column is passed through the clamping hole; A buckle is arranged on the other side of the protective net, and a buckle hole is arranged on the second shell, and the buckle is buckled in the buckle hole.

3. The indoor unit according to claim 2, characterized in that: The protective net includes a frame; The clamping column comprises two sub-clamping columns which are arranged relatively at an interval and connected to the frame, a deformation space is formed between the two sub-clamping columns, and the two sub-clamping columns can move closer to or farther from each other to be elastically tensioned on the clamping hole.

4. The indoor unit according to claim 3, characterized in that: The sub-card column includes a column and a cap body, wherein the column is connected to the frame, and the cap body is connected to an end of the column away from the frame, wherein the column is inserted into the card hole, and the cap body abuts against the outer wall surface of the first shell.

5. The indoor unit according to claim 3, characterized in that: The clamping column further comprises a supporting rib, which is located in the deformation space and has two ends respectively connected to the two sub-clamping columns.

6. The indoor unit according to claim 3, characterized in that: The frame is formed with a position-avoiding groove recessed toward the inside of the protection net, the sub-card column is connected to the groove bottom wall of the position-avoiding groove, and part of it extends out from the notch of the position-avoiding groove.

7. The indoor unit according to claim 6, characterized in that: The protection net also includes connecting ribs, and two ends of the connecting ribs are respectively connected to the sub-card column and the side wall of the avoidance groove.

8. The indoor unit according to claim 2, characterized in that: The protective net includes a frame, which includes a base portion and a limiting portion that are connected to each other. The buckle is connected to the base portion and is arranged relatively spaced apart from the limiting portion. The buckle, the base portion and the limiting portion cooperate to form a limiting space, and the limiting space is used for embedding a part of the structure of the second shell.

9. The indoor unit according to claim 8, characterized in that: The frame further includes a holding portion, which is connected to the base portion and extends in the opposite direction to the limiting portion; The buckle comprises a clamping section and an operating section respectively extending toward opposite sides of the base portion, the clamping section and the limiting portion are arranged relatively at intervals, and the operating section and the holding portion are arranged relatively at intervals.

10. The indoor unit according to claim 8, characterized in that: The frame further comprises a clamping portion, which is connected to the base portion and spaced relative to the limiting portion. The clamping portion and the limiting portion are used to respectively limit and abut against two opposite surfaces of the second shell.

11. The indoor unit according to any one of claims 2 to 10, characterized in that: It also includes a heat exchanger and an electric control box, the air duct includes a fan cavity, a pressure diffusion cavity and a heat exchange cavity which are connected in sequence, the fan cavity is connected to the return air port, the fan is located in the fan cavity, and the heat exchanger is located in the heat exchange cavity; The electric control box is located on the lower surface of the second shell corresponding to the fan cavity and is arranged adjacent to the return air outlet, and the clamping position of the protective net and the second shell is located between the fan and the electric control box.

12. The indoor unit according to claim 11, characterized in that: The second shell includes a diffuser lower shell and a guide plate forming the bottom wall of the diffuser chamber, the diffuser lower shell is inclined from top to bottom in the direction from the fan chamber to the heat exchange chamber, the guide plate is connected to the side of the diffuser lower shell close to the fan chamber and is provided with the buckle hole, and the electrical control box is installed on the lower surface of the diffuser lower shell.

13. The indoor unit according to claim 11, characterized in that: An installation cavity is formed on the bottom surface of the shell between the fan cavity and the heat exchange cavity, the electric control box is installed in the installation cavity, and the projections of the protective net and the electric control box on the plane where the cavity opening of the installation cavity is located do not overlap each other.

14. The indoor unit according to claim 13, characterized in that: The protection net includes a plurality of protection parts connected in sequence, and the plurality of protection parts are arranged at angles with each other.

15. The indoor unit according to claim 14, characterized in that: The protection part includes a first protection part and a second protection part; The first protection part is located between the lower part of the fan and the electric control box; the second protection part is located on a side of the fan close to the return air outlet; Wherein, the first protection portion is perpendicular to the plane where the cavity opening of the installation cavity is located; and / or, The second protection portion is parallel to a plane where the cavity opening of the installation cavity is located.

16. The indoor unit according to claim 14, characterized in that: The protective part includes a first protective part, a second protective part and a third protective part which are connected in sequence; the first protective part is clamped with the second shell, and the first protective part is located between the lower part of the fan and the electric control box; the third protective part is clamped with the first shell, and the third protective part is located on a side of the fan close to the return air outlet; The angle between the first protection part and the second protection part and the angle between the third protection part and the second protection part are both obtuse angles; Wherein, the first protection portion is perpendicular to the plane where the cavity opening of the installation cavity is located; and / or, The third protection portion is parallel to a plane where the cavity opening of the installation cavity is located.

17. The indoor unit according to claim 13, characterized in that: The protection net is arranged in an arc shape, and the distance between the protection net and the electric control box gradually increases in the direction toward the cavity opening of the installation cavity.

18. A HVAC system, characterized in that: It comprises an indoor unit and an outdoor unit as described in any one of claims 1 to 17, wherein the outdoor unit pipe is connected to the indoor unit.

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