Air duct structure, indoor unit and heating and ventilation equipment

Abstract

The invention discloses an air duct structure, an indoor unit and heating and ventilation equipment. The air duct structure comprises a shell, a fan cavity and a diffusion cavity which are sequentially communicated are formed in the shell, and the shell at least comprises a head part and a flow guide part; the part, facing the airflow channel, of the head is at least constructed into a volute tongue, the part, deviating from the airflow channel, of the head is at least constructed into a first air return face, and the first air return face extends to the fan cavity from the diffusion cavity. The flow guide part is provided with a second air return surface which corresponds to the first air return surface and is arranged at an interval, a first opening and a second opening are formed between the first air return surface and the second air return surface, the first opening faces the diffusion cavity, the second opening faces the fan cavity, and the backflow channel extends from the first opening to the second opening. The flow guide part and the head on the two sides of the backflow channel are arranged in a split mode, when the flow guide part and the head are prepared, mold opening is convenient, and the process difficulty is low.

Description

Technical Field

[0001] The present application relates to the technical field of HVAC equipment, and in particular to an air duct structure, an indoor unit and HVAC equipment. Background Art

[0002] The indoor unit of the HVAC equipment is installed indoors for air supply to adjust the temperature of the environment in which the indoor unit is located. Among them, the air supply effect of the indoor unit is the focus of attention when designing the product. In the related technology, the airflow out of the fan of the indoor unit is split by the volute tongue and flows to the diffuser cavity and the air inlet side of the fan respectively. Among them, by designing a return channel, the airflow in the diffuser cavity is guided to the air inlet side of the fan, which can effectively reduce the vortex at the fan and improve the operating efficiency of the fan. However, due to the presence of multiple airflow branches near the return channel, the structure is complex, the structure of the return channel is difficult to open the mold, and it is inconvenient to assemble. Summary of the invention

[0003] The embodiments of the present application provide an air duct structure, an indoor unit and HVAC equipment, which can solve the problem of difficulty in structural mold opening at the return channel.

[0004] In a first aspect, an embodiment of the present application provides an air duct structure, comprising:

[0005] A housing, wherein an air flow channel is formed in the housing, and the air flow channel at least includes: a fan chamber and a diffuser chamber;

[0006] The housing has a volute tongue located at the junction of the fan cavity and the pressure diffuser cavity, and a return flow channel located on the side of the volute tongue away from the air flow channel. The fan cavity is provided with a fan, and the fan drives the external air flow into the fan cavity. The volute tongue guides at least part of the air flow from the fan cavity into the pressure diffuser cavity. The return flow channel connects the pressure diffuser cavity and the fan cavity, and guides at least part of the air flow from the pressure diffuser cavity back to the fan cavity.

[0007] The housing at least comprises: a head and a flow guide;

[0008] The portion of the head facing the airflow channel is at least configured as the volute tongue, and the portion of the head facing away from the airflow channel is at least configured as a first return air surface, and the first return air surface extends from the diffuser cavity to the fan cavity;

[0009] The guide portion has a second return air surface spaced apart corresponding to the first return air surface, a first opening and a second opening are formed between the first return air surface and the second return air surface, the first opening faces the diffuser cavity, the second opening faces the fan cavity, and the return flow channel extends from the first opening to the second opening.

[0010] In some exemplary embodiments, the housing includes at least a first housing, the first housing includes at least the guide portion and a first plate, the first plate is integrally extended from the guide portion toward the downstream of the airflow, and the first plate is at least configured as a portion of the bottom wall of the diffuser cavity;

[0011] The head is independently arranged from the first shell, the second return air surface of the air guide portion is spaced apart from the first return air surface on the side away from the air flow channel, and the first opening, the return flow channel and the second opening are surrounded by the first return air surface and the second return air surface.

[0012] In some exemplary embodiments, the shell includes at least a first shell, the first shell includes at least the head and a first plate, the first plate is integrally extended from the head toward the downstream of the airflow, and the first plate is at least configured as a portion of the bottom wall of the diffuser cavity, and the first opening is formed through the bottom wall of the diffuser cavity;

[0013] The guide portion is independently arranged with respect to the first shell, and the guide portion includes a mounting portion and a guiding portion. The mounting portion is fixedly mounted on the first shell at the edge of the first opening, and is spaced apart on the side of the first return air surface away from the air flow channel. The second opening and the return flow channel are surrounded by the first return air surface via the guiding portion.

[0014] In some exemplary embodiments, one of the first return air surface and the second return air surface is provided with at least one guide rib, and the other of the first return air surface and the second return air surface is in contact with the at least one guide rib.

[0015] In some exemplary embodiments, the guide rib is convexly provided on the first return air surface and is integrally formed with the first return air surface, and the second return air surface abuts against the guide rib; and / or,

[0016] The guide convex rib is integrally formed with the second air return surface at the first opening, and the first air return surface abuts against the guide convex rib.

[0017] In some exemplary embodiments, one of the first return air surface and the second return air surface is provided with a plurality of the guide ribs, and the plurality of the guide ribs are arranged side by side and at intervals along the transverse direction of the return air channel, and the plurality of the guide ribs divide the first opening of the return air channel into a plurality of sub-inlets, and the transverse direction of the return air channel is perpendicular to the direction of airflow flow in the return air channel and perpendicular to the direction from the first return air surface toward the second return air surface.

[0018] In some exemplary embodiments, the flow guiding ribs extend longitudinally along the return air channel and from the first opening of the return air channel towards the side where the second opening is located, and the longitudinal direction of the return air channel is the direction of air flow within the return air channel;

[0019] One of the first return air surface and the second return air surface is provided with a plurality of the flow guiding ribs, and the plurality of flow guiding ribs are arranged side by side and spaced apart along the transverse direction of the return air channel. The transverse direction of the return air channel is perpendicular to the direction of air flow within the return air channel and perpendicular to the direction in which the first return air surface faces the second return air surface.

[0020] In some exemplary embodiments, in the transverse direction of the return air channel, the spacing between two adjacent flow guiding ribs is equal; or, in the transverse direction of the return air channel, the return air channel includes a plurality of return air areas arranged side by side, and the air flow pressures of two adjacent return air areas are different. The spacing between two adjacent flow guiding ribs in the return air area with a larger air flow pressure is a1, and the spacing between two adjacent flow guiding ribs in the return air area with a smaller air flow pressure is a2, and a2 > a1.

[0021] In some exemplary embodiments, at least one of the flow guiding ribs provided on one of the first return air surface and the second return air surface has two first surfaces arranged oppositely, and the two first surfaces are respectively perpendicular to or protrude at an obtuse angle from one of the first return air surface and the second return air surface.

[0022] In some exemplary embodiments, the flow guiding rib has a second surface connected between the two first surfaces, and the second surface abuts against the other of the first return air surface and the second return air surface.

[0023] In some exemplary embodiments, in the direction from the first opening towards the second opening of the return air channel, the vertical spacing between the two first surfaces gradually decreases or remains unchanged.

[0024] In some exemplary embodiments, the head includes a first component and a second component that are independent of each other. The first component forms the volute tongue, and the second component forms the first return air surface. The first component is detachably mounted on the second component.

[0025] In some exemplary embodiments, first mating portions extend from both ends of the first component towards the side away from the air flow channel, and second mating portions extend from both ends of the second component towards the air flow channel side. Each section of the first mating portion is correspondingly superposed on the outside of each second mating portion. One end of the first mating portion faces the diffuser cavity and forms part of the bottom wall of the diffuser cavity, and the other end of the first mating portion faces the return air channel and forms part of the first return air surface.

[0026] In some exemplary embodiments, at least one first protrusion is formed on the surface of the first mating portion facing the guiding portion, and a plurality of second protrusions are formed on the surface of the second component facing the guiding portion, and each first protrusion is docked with one of the second protrusions to form a guiding rib.

[0027] In some exemplary embodiments, the air duct structure further includes a plurality of clamping blocks, each of which protrudes from one of the guiding ribs and is integrally formed with the guiding rib; a plurality of clamping openings are formed in the second return air surface, and each clamping block is inserted into one of the clamping openings.

[0028] In some exemplary embodiments, the air duct structure further includes a plurality of clamping blocks, each of which is integrally formed on one of the second protrusions, and the clamping block extends to fit on the surface of the first protrusion docked with the second protrusion.

[0029] In a second aspect, an embodiment of the present application provides an indoor unit, including the air duct structure as described above.

[0030] In a third aspect, an embodiment of the present application provides a heating, ventilation and air conditioning (HVAC) device, including the indoor unit as described above.

[0031] Based on the air duct structure, indoor unit and HVAC device of the embodiments of the present application, when the air flow flowing out of the fan is split by the volute tongue and flows to the diffuser cavity and the fan cavity respectively, the static pressure of the air flow flowing into the diffuser cavity after splitting becomes larger, so that the air flow pressure at the first opening is greater than the air flow pressure at the second opening. Due to the pressure difference between the first opening and the second opening, part of the air flow entering the diffuser cavity is actively guided back to the fan cavity through the return air channel to do work again. In this way, not only can the pressure in the fan cavity between the volute tongue and the fan be compensated, thereby weakening the vortex effect, effectively improving the operating efficiency of the fan, improving the intake efficiency and anti-pressure performance of the air flow returning to the fan cavity, so as to enhance the overall aerodynamic performance of the air duct structure, but also the aerodynamic noise in the air duct structure can be synchronously reduced after weakening the vortex. And in the embodiments of the present application, the guiding portion and the volute tongue are separately arranged, which is convenient for mold opening and has low process difficulty when preparing the guiding portion and the volute tongue. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0033] Figure 1 Schematic perspective view of an indoor unit according to an embodiment of the present application;

[0034] Figure 2 Schematic perspective view of an air duct structure according to an embodiment of the present application installed in a housing;

[0035] Figure 3 Schematic cross-sectional view of an indoor unit according to an embodiment of the present application;

[0036] Figure 4 is Figure 3 Partial enlarged view at Q in;

[0037] Figure 5 Schematic exploded view of an air duct structure according to an embodiment of the present application;

[0038] Figure 6 Schematic perspective view of a first component installed on a second component according to an embodiment of the present application;

[0039] Figure 7 Schematic perspective view of a flow guiding part installed on a volute tongue and a first plate body according to an embodiment of the present application.

[0040] Reference numerals:

[0041] 1. Indoor unit; 10. Air duct structure; 11. Fan chamber; 111. Return air area; 112. First transition area; 12. Diffuser chamber; 121. Second transition area; 13. Heat exchange chamber; 131. Air outlet area;

[0042] 20. First housing; 30. Second housing; 31. Return flow channel; 32. First opening; 33. Second opening;

[0043] 40. Head; 410. Volute tongue; 401. First return air surface; 41. First component; 42. First mating part; 43. Second mating part; 45. Second component; 402. Mating groove; 403. First cavity;

[0044] 51. First plate body; 501. Diffuser bottom wall; 502. Flow guiding end plate;

[0045] 25. Diversion part; 205. Second return air surface; 2051. Card slot opening; 251. Connection part; 252. Fixing part; 253. Guiding part;

[0046] 26. Diversion rib; 2601. First surface; 2602. Second surface; 261. First convex part; 262. Second convex part; 263. Block;

[0047] 60. Water receiving tray; 70. Diversion end plate; 91. Fan; 92. Heat exchanger; 93. Electric control box; 98. Grille. Detailed implementation manners

[0048] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] An embodiment of the present application provides a heating, ventilation and air conditioning (HVAC) device. The HVAC device includes an indoor unit and an outdoor unit. The indoor unit and the outdoor unit are connected by cables, pipelines, etc. to jointly operate to regulate the indoor environment.

[0050] Understandably, the indoor unit is arranged indoors and is usually installed in the form of ceiling suspension for supplying indoor air. As Figures 1 to 3 shown, it is a schematic structural diagram of an indoor unit 1 according to an embodiment of the present application. The indoor unit 1 includes an air duct structure 10, a fan 91, a heat exchanger 92, an electric control box 93, etc.

[0051] The air duct structure 10 is used to construct an air duct suitable for the indoor unit 1 for gas flow. Specifically, the air duct structure 10 includes a housing, and the outer contour of the housing may be generally rectangular. As Figure 3 shown, an air flow channel is formed inside the housing. The air flow channel includes a fan chamber 11 and a diffuser chamber 12. The fan chamber 11 has a return air area 111 and a first transition area 112. The diffuser chamber 12 is arranged corresponding to the first transition area 112. A second transition area 121 is formed in the area of the diffuser chamber 12 far from the fan chamber 11. The air flow channel further includes a heat exchange chamber 13. The heat exchange chamber 13 is arranged corresponding to the second transition area 121. An air outlet area 131 is formed in the area of the heat exchange chamber 13 far from the diffuser chamber 12.

[0052] The fan 91 is arranged in the fan chamber 11. The fan 91 drives the outside air flow to enter the fan chamber 11 from the return air area 111, and does work on it to make it flow through the first transition area 112 to the diffuser chamber 12 at a relatively fast flow rate, providing power for the gas circulation of the above-mentioned air duct, so that the air flow can flow through the second transition area 121 of the diffuser chamber 12 to the heat exchange chamber 13 and flow out of the air flow channel through the air outlet area 131 of the heat exchange chamber 13. As Figure 3As shown, the direction indicated by the dotted arrow is the direction in which the airflow flows in the airflow channel.

[0053] The heat exchanger 92 is accommodated in the heat exchange cavity 13, and is used to exchange heat with the gas flowing through the heat exchange cavity 13 and passing through the heat exchanger 92, so as to cool or heat the gas. For example, a plurality of refrigerant pipes are provided in the heat exchanger 92, and the gas exchanges heat with the refrigerant in the pipe when passing through the heat exchanger 92, so that the temperature is reduced to form low-temperature air. In order to increase the heat exchange area of ​​the heat exchanger 92, the heat exchanger 92 can be arranged in a V-shape, an arc shape or a wave shape, and is composed of a single heat exchange plate, or is composed of a plurality of heat exchange plates.

[0054] An electric control panel assembly is provided in the electric control box 93, and a variety of electronic components are integrated on the electric control panel assembly, which is used to electrically connect the fan 91 and other devices, and is used to generally control the overall operation of the indoor unit 1. Inevitably, the electronic components will generate a lot of heat during operation. In the embodiment of the present application, the electric control box 93 can be installed in the housing of the air duct structure 10, or be arranged close to the air flow channel, so as to dissipate heat to a certain extent from the electric control box 93 through the air flow channel.

[0055] The shell of the air duct structure 10 includes a first shell 20 and a second shell 30, and the first shell 20 is connected to the second shell 30 to form an air flow channel having an upper fan chamber 11, a pressure diffuser chamber 12 and a heat exchange chamber 13. Among them, the first shell 20 and the second shell 30 can be respectively made of metal materials such as aluminum alloy or stainless steel to meet the requirements of high strength and corrosion resistance, or the first shell 20 and the second shell 30 can also be made of plastic material to achieve lightweight shells, and the present application does not limit this. For example, the shell can be a combination of the first shell 20 being a metal material and the second shell 30 being a plastic material. In addition, the embodiment of the present application does not limit the connection method of the first shell 20 and the second shell 30, and they can be connected individually or in combination by means of clamping, riveting, welding and bolting.

[0056] The housing has a volute tongue 410 located at the junction of the fan chamber 11 and the pressure diffuser chamber 12, and a return channel 31 located on the side of the volute tongue 410 away from the airflow channel. The fan chamber 11 is provided with a fan 91, and the fan 91 drives the external airflow into the fan chamber 11. The volute tongue 410 guides at least part of the airflow from the fan chamber 11 into the pressure diffuser chamber 12. The return channel 31 connects the pressure diffuser chamber 12 and the fan chamber 11, and guides at least part of the airflow from the pressure diffuser chamber 12 back to the fan chamber 11. Figure 4 and Figure 5As shown, the shell of the air duct structure of the embodiment of the present application includes at least a head 40 and a first plate 51, the portion of the head 40 facing the airflow channel is at least configured as a volute 410, the first plate 51 extends toward the downstream of the airflow, and the first plate 51 is a portion of the first shell 20, a portion of the second shell 30 of the indoor unit 1 and the head 40 define a fan chamber 11, and another portion of the second shell 30 of the indoor unit 1, the head 40 and the first plate 51 define a diffuser chamber 12. The first shell 20 of the indoor unit 1 also includes a water receiving tray 60, which is connected to one end of the first plate 51 away from the head 40, and the remaining portion of the second shell 30 of the indoor unit 1 and the water receiving tray 60 define a heat exchange chamber 13, and the water receiving tray 60 is used to collect water droplets condensed from the heat exchanger 92.

[0057] The shell of the air duct structure of the embodiment of the present application also includes a guide portion 25, and the portion of the head 40 facing away from the air flow channel is at least configured as a first return air surface 401, and the first return air surface 401 extends from the pressure diffuser chamber 12 to the fan chamber 11. The guide portion 25 has a second return air surface 205 spaced apart from the first return air surface 401. Specifically, the guide portion 25 includes a guide portion 252, and the guide portion 252 is arranged on the side of the first return air surface 401 facing away from the air flow channel, and the guide portion 252 has the second return air surface 205. A first opening 32 and a second opening 33 are formed between the first return air surface 401 and the second return air surface 205, the first opening 32 faces the pressure diffuser chamber 12, and the second opening 33 faces the fan chamber 11, and the return flow channel 31 extends from the first opening 32 to the second opening 33.

[0058] Among them, the head 40 and the first plate body 51 define a diffuser bottom wall 501 of the diffuser chamber 12 for gas circulation, and a part of the head 40 forms a volute tongue 410, and the airflow out of the fan 91 will be diverted by the volute tongue 410 to flow to the diffuser chamber 12 and the area between the volute tongue 410 and the fan 91, respectively, so as to flow back to the fan chamber 11. It can be understood that when the airflow out of the fan 91 is diverted by the volute tongue 410 to flow to the diffuser chamber 12 and the fan chamber 11 respectively, the airflow pressure (static pressure) flowing into the diffuser chamber 12 after diversion becomes larger, so that the airflow pressure of the first opening 32 is greater than the airflow pressure of the second opening 33, and then through the pressure difference between the first opening 32 and the second opening 33, part of the airflow entering the diffuser chamber 12 is actively guided back to the fan chamber 11 through the return channel 31 to work again. In this way, not only can the pressure of the fan chamber 11 between the volute tongue 410 and the fan 91 be compensated, thereby weakening the vortex effect, effectively improving the operating efficiency of the fan 91, and improving the air intake efficiency and pressure resistance of the airflow returning to the fan chamber 11, thereby improving the overall aerodynamic performance of the air duct structure 10, but also weakening the vortex and synchronously reducing the aerodynamic noise in the air duct structure 10. In the embodiment of the present application, the guide portion 25 and the volute tongue 410 are separately provided, and when preparing the guide portion 25, the volute tongue 410 and the first plate body 51, it is convenient to open the mold, and the process difficulty is low.

[0059] Optionally, the first shell 20 includes at least a guide portion 25 and a first plate 51, the first plate 51 is integrally extended from the guide portion 25 toward the downstream of the airflow, for example, the guide portion 25 also includes a mounting portion 251, the mounting portion 251 is connected to the side of the guide portion 252 away from the second return air surface 205 at an angle, and the first plate 51 is integrally extended from the guide portion 252 or the mounting portion 251 toward the downstream of the airflow. Wherein, the first plate 51 and the head 40 are configured as parts of the bottom wall of the pressure diffuser 12, the head 40 is independently arranged from the first shell 20, that is, the head 40 is detachably mounted on the first shell 20, the second return air surface 205 of the guide portion 25 is spaced apart from the side of the first return air surface 401 away from the airflow channel, and the first opening 32, the return flow channel 31 and the second opening 33 are surrounded by the first return air surface 401 and the second return air surface 205. Furthermore, the first shell 20 may also include two guide end plates 502. In a direction perpendicular to the first return air surface 401 toward the second return air surface 205 (i.e., the horizontal direction of the return flow channel 31 described later), the two guide end plates 502 are respectively connected to the first plate body 51 and the guide portion 252 on opposite sides, and the head 40 is detachably mounted on at least one of the first plate body 51, the guide portion 252 and the guide end plate 502. At this time, the guide end plate 502 can extend to connect to the head 40, and the return flow channel 31 is jointly defined by the walls of the first return air surface 401, the second return air surface 205 and the two guide end plates 502.

[0060] Alternatively, ifFigure 4 As shown, the first housing 20 at least includes a head 40 and a first plate body 51. The first plate body 51 extends integrally from the head 40 towards the downstream of the air flow. The first plate body 51 and the head 40 are configured to be part of the bottom wall of the diffuser chamber 12. The first opening 32 is formed through the bottom wall of the diffuser chamber 12. For example, the first opening 32 penetrates the first plate body 51, or the first opening 32 is defined by the first air return surface 401 of the head 40 and the surface of the first plate body 51 facing the head 40. Among them, the guide part 25 is independently arranged from the first housing 20, that is, the guide part 25 is detachably installed on the first housing 20. For example, the guide part 25 is detachably installed on the first plate body 51 or the head 40. Specifically, the guide part 25 includes a mounting part 251 and a guiding part 252. The mounting part 251 is connected at an angle to the side of the guiding part 252 facing away from the second air return surface 205, and the mounting part 251 is fixedly installed on the first housing 20 at the edge of the first opening 32. The mounting part 251 is installed on at least one of the head 40 and the first plate body 51, and the mounting part 251 is spaced from the side of the first air return surface 401 facing away from the air flow channel. The second opening 33 and the return channel 31 are formed by enclosing with the first air return surface 401 via the guiding part 253. Further, as Figure 5 As shown, the first housing 20 may further include two guide end plates 502. In the direction perpendicular to the first air return surface 401 and towards the second air return surface 205 (that is, the transverse direction of the return channel 31 described later), the two guide end plates 502 are respectively connected to the first plate body 51 and the head 40 on opposite sides. The guide part 25 is detachably installed on at least one of the first plate body 51, the head 40, and the guide end plate 502. At this time, the return channel 31 is jointly defined by the wall surfaces of the first air return surface 401, the second air return surface 205, and the two guide end plates 502.

[0061] It can be understood that the air flow diverted into the return channel 31 has a relatively high pressure. The guide part 25 is separately arranged from the volute tongue 410. When the air flow enters the return channel 31, due to the relatively high air flow pressure, the air flow will act on the wall surfaces of the guide part 25 and the volute tongue 410, which easily causes the guide part 25 and the volute tongue 410 to be unstable in installation, and even causes deformation of the guide part 25 and the volute tongue 410. As Figure 6As shown in the figure, in the embodiment of the present application, the air duct structure 200 is further provided with at least one flow guiding rib 26. The flow guiding rib 26 is arranged in the return air passage 31 and divides the return air passage 31 into multiple sub-air ducts. The air flow separated from the diffuser chamber 12 is divided into multiple air flows and led out of the diffuser chamber 12, so as to divide the pressure of the air flow entering the return air passage 31. The air flow pressure entering a single sub-air duct is relatively small, and the acting force of the air flow in each sub-air duct on the head 40 and the flow guiding part 25 is also relatively small, which can effectively reduce the deformation of the head 40 and the flow guiding part 25 caused by the air flow entering the return air duct. In addition, the flow guiding rib 26 is located between the first return air surface 401 and the second return air surface 205, and can provide support for the head 40 and the return air duct flow plate, further improving the deformation at the head 40 and the flow guiding part 25.

[0062] The flow guiding rib 26 is integrally provided with at least one of the first plate body 51, the flow guiding part 25 and the head 40, and the flow guiding rib 26 is arranged without gaps with the first return air surface 401 and the second return air surface 205 respectively. Herein, the arrangement without gaps means at least including at least one of integral setting and fitting setting. By arranging the rib, a more stable supporting effect on the head 40 and the flow guiding part 25 is achieved, and the head 40 and the flow guiding part 25 are less likely to deform.

[0063] When the flow guiding rib 26 is integrally provided with the first plate body 51, the head 40 and the flow guiding part 25 can be respectively arranged in a fitting manner with the flow guiding rib 26. It can be understood that since the head 40 and the flow guiding part 25 are separately provided, only one of the head 40 and the flow guiding part 25 can be integrally provided with the flow guiding rib 26, and the other of the head 40 and the flow guiding part 25 needs to be arranged in a fitting manner with the flow guiding rib 26.

[0064] Optionally, one of the first return air surface 401 and the second return air surface 205 is provided with the flow guiding rib 26, and the flow guiding rib 26 is in contact with the other of the first return air surface 401 and the second return air surface 205. For example, the flow guiding rib 26 is formed on the first return air surface 401 of the head 40, and the part of the flow guiding rib 26 away from the first return air surface 401 is in contact with the second return air surface 205 of the flow guiding part 25; or, the flow guiding rib 26 is formed on the second return air surface 205 of the flow guiding part 25, and the part of the flow guiding rib 26 away from the second return air surface 205 is in contact with the first return air surface 401 of the head 40. In this way, in the manner of integrally providing the flow guiding rib 26 with one of the head 40 and the flow guiding part 25, the attachment area of the flow guiding rib 26 is larger, the structural stability is stronger, the interaction force among the flow guiding rib 26, the head 40 and the flow guiding part 25 is stronger, and it is less likely to deform.

[0065] When the flow guiding rib 26 is formed on the first air return surface 401 of the head 40 and is integrally provided with the head 40, the flow guiding rib 26 is attached to the second air return surface 205, and the flow guiding rib 26 extends to the first opening 32 of the return air channel 31. The flow guiding rib 26 is integrally provided with the first plate body 51 at the first opening 32 of the return air channel 31. The plurality of flow guiding ribs 26 divide the first opening 32 of the return air channel 31 into a plurality of sub-inlets. The head 40 can be connected to the first plate body 51 through the plurality of flow guiding ribs 26, so as to realize the integral setting of the head 40, the first plate body 51 and the flow guiding rib 26, which is convenient for assembly.

[0066] The flow guiding rib 26 extends longitudinally along the return air channel 31 and from the first opening 32 of the return air channel 31 to the side where the second opening 33 is located. The longitudinal direction of the return air channel 31 is the direction of air flow in the return air channel 31, specifically the direction in which the air flows from the first opening 32 towards the second opening 33. Figure 4 The direction indicated by the arrow S in the figure is the direction of air flow in the return air channel 31. In this way, the air flow entering each sub-air duct is smooth, and the flow resistance of the air flow entering the return air channel 31 is small. Further, the flow guiding rib 26 penetrates the return air channel 31 longitudinally, so that the state of the air flow flowing out of the return air channel 31 is stable, and the air resistance of the air flow flowing to the fan cavity 11 is reduced.

[0067] The plurality of flow guiding ribs 26 are arranged side by side and at intervals in the transverse direction of the return air channel 31. The transverse direction of the return air channel 31 is perpendicular to the direction of air flow in the return air channel 31 and perpendicular to the direction in which the first air return surface 401 faces the second air return surface 205. As Figure 6 shown, the direction indicated by the arrow T is the transverse direction of the return air channel 31.

[0068] In the transverse direction of the return air channel 31, the distances between two adjacent flow guiding ribs 26 are equal, or alternatively, the distances between two adjacent flow guiding ribs 26 may not be equal. It can be understood that in the transverse direction of the return air channel 31, the air flow pressures in various regions of the return air channel 31 may be different. In the region where the air flow pressure is strong, the acting force of the air flow on the head 40 and the flow guiding portion 25 is stronger, and the head 40 and the flow guiding portion 25 at this location are more likely to deform. Based on this, more flow guiding ribs 26 can be provided in the region of the air flow pressure to divide the region into multiple sub-flow channels with smaller flow areas. Specifically, in the transverse direction of the return air channel 31, the return air channel 31 includes a plurality of return air areas arranged side by side, and the air flow pressures of two adjacent return air areas are different. The distance between two adjacent flow guiding ribs 26 in the return air area with a larger air flow pressure is a1, and the distance between two adjacent flow guiding ribs 26 in the return air area with a smaller air flow pressure is a2, where a2 > a1. For example, in the transverse direction of the return air channel 31, when the air flow pressure in the middle region is large and the air flow pressure in the edge region is small, in the direction from the edge region towards the middle region, the distance between two adjacent flow guiding ribs 26 gradually decreases, that is, the plurality of flow guiding ribs 26 are distributed in a state where they are relatively dense in the middle and relatively loose at the edge.

[0069] The flow guiding ribs 26 are arranged without gaps with the first return air surface 401 and the second return air surface 205 respectively, and the width of the flow guiding rib 26 in the direction from the first return air surface 401 towards the second return air surface 205 is the width of the corresponding region of the return air duct. In the transverse direction of the return air duct, the widths of the flow guiding ribs 26 in the direction from the first return air surface 401 towards the second return air surface 205 are equal or different. Optionally, in the return air area with a larger air flow pressure, the width of the flow guiding rib 26 in the direction from the first return air surface 401 towards the second return air surface 205 is smaller, and in the return air area with a smaller air flow pressure, the width of the flow guiding rib 26 in the direction from the first return air surface 401 towards the second return air surface 205 is larger.

[0070] The flow guiding rib 26 has two first surfaces 2601 that are oppositely arranged in the transverse direction of the return air channel 31, and the two first surfaces 2601 are respectively perpendicular to or convexly arranged at an obtuse angle with one of the first return air surface 401 and the second return air surface 205. In this way, the flow guiding rib 26 has a larger connection area with the corresponding head 40 or flow guiding portion 25, improving the installation stability of the flow guiding rib 26.

[0071] In the direction where the first opening 32 of the return air channel 31 faces the second opening 33, the vertical distance between the two first surfaces 2601 in the lateral direction of the return air channel 31 gradually decreases or remains unchanged. Considering that the air pressure at the first opening 32 of the return air channel 31 is relatively high and the air pressure at the second opening 33 is relatively low, preferably, in the direction where the first opening 32 of the return air channel 31 faces the second opening 33, the vertical distance between the two first surfaces 2601 in the lateral direction of the return air channel 31 gradually decreases, so that the flow area of the sub-air duct gradually increases.

[0072] Optionally, the two first surfaces 2601 of the flow guiding rib 26 can extend to intersect at a flow guiding line. For example, when both of the two first surfaces 2601 of the flow guiding rib 26 are connected to the first return air surface 401, the two first surfaces 2601 intersect at a flow guiding line along the direction away from the first return air surface 401, and the flow guiding line is attached to the second return air surface 205; or, when both of the two first surfaces 2601 of the flow guiding rib 26 are connected to the second return air surface 205, the two first surfaces 2601 intersect at a flow guiding line along the direction away from the second return air surface 205, and the flow guiding line is attached to the second return air surface 205.

[0073] Optionally, the flow guiding rib 26 has a second surface 2602 connected between the two first surfaces 2601, and the second surface 2602 is attached to the other one of the first return air surface 401 and the second return air surface 205 to improve the support stability of the flow guiding rib 26 for the head 40 and the flow guiding part 25. For example, when both of the two first surfaces 2601 of the flow guiding rib 26 are connected to the first return air surface 401, the second surface 2602 is attached to the second return air surface 205; when both of the two first surfaces 2601 of the flow guiding rib 26 are connected to the second return air surface 205, the second surface 2602 is attached to the first return air surface 401.

[0074] In the embodiments of the present application, the shape and size of the flow guiding rib 26 can be designed, and then the distance between the first return air surface 401 and the second return air surface 205 can be set. That is, in the direction where the first return air surface 401 faces the second return air surface 205, the width of the flow guiding rib 26 is the width of the return air channel 31. The above is only an exemplary introduction to the structure of the flow guiding rib 2. In the embodiments of the present application, the shape and size of the flow guiding rib 26 are not limited, and can be specifically selected according to actual needs to change the shape of each sub-air duct.

[0075] The first opening 32 of the return air channel 31 faces the diffuser cavity 12, the second opening 33 of the return air channel 31 faces the fan cavity 11, and the return air channel 31 is arranged in an arc shape, so as to smoothly guide a part of the air flow in the diffuser cavity 12 to the fan cavity 11 and reduce the wind resistance of the air flow in the return air channel 31 entering the fan cavity 11.

[0076] It can be understood that the head 40 is used to divide the air flow flowing out of the fan 91 to flow to the diffuser chamber 12 and the side of the head 40 close to the fan chamber 11 respectively. At the same time, a return air channel 31 is provided at the first return air surface 401 of the head 40. Therefore, there are three air flow spaces near the head 40, and the air flow directions of the three air flow spaces form an angle with each other. Correspondingly, the outer contour of the cross section of the head 40 in the transverse direction of the return air channel 31 is approximately triangular, that is, the first vertex of the triangular cross section of the head 40 is near the junction of the first transition region 111 of the fan chamber 11 and the diffuser chamber 12, the second vertex is near the junction of the diffuser chamber 12 and the first opening 32 of the return air channel 31, and the third vertex is near the junction of the second opening 33 of the return air channel 31 and the fan chamber 11. Based on this, optionally, a first chamber 403 is provided inside the head 40 to reduce the material consumption of the head 40, reduce the mass of the head 40, and further reduce the weight of the entire indoor unit 1.

[0077] As Figure 4 shown, optionally, the head 40 includes a first component 41 and a second component 45 that are independent of each other. The first component 41 forms a volute tongue 410, and the second component 45 forms a first return air surface 401. The first component 41 is detachably mounted on the second component 45, and the first component 41 and the second component 45 define the first chamber 403 of the head 40. Among them, the first chamber 403 inside the head 40 is a closed cavity to prevent the air flow outside the head 40 from intermixing with the gas inside the first chamber 403 of the head 40, resulting in air flow disorder in the space outside the head 40.

[0078] The first component 41 and the second component 45 are snap-fitted to achieve the detachable connection between the first component 41 and the second component 45. Optionally, one side of the part of the second component 45 adjacent to the first opening 32 is snap-connected to the first component 41, and the other side is connected to the first plate body 51. For example, when the first opening 32 of the return air channel 31 is opened on the surface of the first plate body 51, the second component 45 is directly connected to the first plate body 51; when the first opening 32 of the return air channel 31 is opened between the first plate body 51 and the first return air surface 401, that is, the first opening 32 is jointly defined by the first plate body 51 and the second component 45, the second component 45 can be connected to the first plate body 51 through a plurality of guide ribs 26.

[0079] From both ends of the first component 41, first mating portions 42 extend respectively towards the side away from the air flow channel. From both ends of the second component 45, second mating portions 43 extend respectively towards the air flow channel side. Each section of the first mating portion 42 is correspondingly superposed on the outer side of each second mating portion 43. One end of the first mating portion 42 faces the diffuser cavity 12 and forms part of the diffuser bottom wall 501 of the diffuser cavity 12. Further, the first mating portion 42, the corresponding second mating portion 43 and the first plate body 51 together form the diffuser bottom wall 501 of the diffuser cavity 12. The other end of the first mating portion 42 faces the return flow channel 31 and forms part of the first return air surface 401.

[0080] Optionally, as Figure 6 shown, a plurality of mating grooves 402 are provided in the portion of the second component 45 adjacent to the second opening 33. The plurality of first mating portions 42 are correspondingly clamped in the mating grooves 402 one by one. In this way, it is convenient for the second component 45 to be quickly aligned with the first component 41, and the installation stability of the second component 45 and the first component 41 near the second opening 33 is improved. At this time, the surfaces of the first mating portion 42 and the second component 45 facing the guide portion 25 form the first return air surface 401. Among them, a single guide rib 26 can be entirely formed on the surface of the second component 45 facing the guide portion 25; or, a part of a single guide rib 26 is formed on the first mating portion 42 and the other part is formed on the second component 45. Specifically, at least one first convex portion 261 is formed on the surface of the first mating portion 42 facing the guide portion 25, and a plurality of second convex portions 262 are formed on the surface of the second component 45 facing the guide portion 25, and each first convex portion 261 is docked with one of the second convex portions 262 to form a guide rib 26.

[0081] Further, each guide rib 26 is formed by docking the first convex portion 261 and the second convex portion 262; or, a part of the guide ribs 26 is only formed on the surface of the second component 45, and the other part of the guide ribs 26 is formed by docking the first convex portion 261 and the second convex portion 262.

[0082] As Figure 6 shown, the air duct structure 200 further includes a plurality of clamping blocks 263. Each clamping block 263 protrudes from one of the guide ribs 26 and is integrally provided with the guide rib 26. Combining Figure 5 and Figure 7The second return air surface 205 is provided with a plurality of positioning openings 2051, and each clamping block 263 is inserted into one of the positioning openings 2051. During assembly, the clamping block 263 is inserted into the corresponding positioning opening 2051, and the guide ribs 26 are respectively arranged without interval with the first return air surface 401 and the second return air surface 205, so that the alignment of the guide part 25 and the head 40 can be quickly completed, the assembly is convenient, and the alignment stability of the guide part 25 and the head 40 is effectively improved. It can also effectively prevent the deformation of the guide part 25 and the second component 45 when the wind pressure is too large.

[0083] Optionally, each block 263 is integrally formed with one of the second protrusions 262, and the block 263 extends to fit the surface of the first protrusion 261 that is docked with the second protrusion 262. This further facilitates the rapid alignment of the first component 41 and the second component 45 and improves the connection stability between the first component 41 and the second component 45.

[0084] In the embodiment of the present application, the width of the return channel 31 in the lateral direction is greater than the flow rate of the airflow in the longitudinal direction of the return channel 31. Based on this, the part of the guide part 25 adjacent to the first opening 32 and the part of the guide part 25 adjacent to the second opening 33 need to be fixed to improve the installation stability of the guide part 25 and prevent the guide part 25 from deformation.

[0085] Please refer to Figure 5 The guide portion 25 includes an integrally arranged connecting portion 251, a guide portion 253 and a fixed portion 252; the connecting portion 251 is stacked on the first plate body 51 and is detachably mounted on the first plate body 51; the guide portion 253 is connected to the connecting portion 251 at an angle and has a second return air surface 205; the fixed portion 252 is connected to an end of the guide plate away from the connecting portion 251 at an angle, the fixed portion 252 is used to guide the airflow in the return channel 31 to flow toward the fan cavity 11, and the fixed portion 252 is used to connect to the grille 98 covered in the return air area 111 of the fan cavity 11. In this way, the contact area of ​​the guide part 25 connected to other structures is increased by the connecting part 251 and the fixing part 252, which effectively improves the installation stability of the guide part 25 plate, and the connecting part 251 and the fixing part 252 each extend in a direction away from the guide part 253, and the connecting part 251, the guide part 253 and the fixing part 252 can interact with each other, further reducing the probability of deformation of the guide part 25. The fixing part 252 can also guide the airflow in the return channel 31 to smoothly enter the return air area 111 of the fan chamber 11, reduce wind resistance, and reduce noise.

[0086] Among them, the functional devices installed on the first plate body 51 may include the electric control box 93, sensors and other devices. The connection portion 251 is arranged at intervals from the functional device, which facilitates the disassembly and assembly of the guide portion 25 and the functional device. The functional device is installed on the first plate body 51, and the gas flowing in the pressure diffusion cavity 12 can also take away the heat generated by the functional device, which helps to dissipate heat. Of course, the functional device, the connection portion 251 and the first plate body 51 can also be stacked to save installation space.

[0087] Optionally, the connecting portion 251 and the fixing portion 252 are connected to the guide portion 253 on the side of the guide portion 253 facing away from the second return air surface 205, and only the guide portion 253 is used to define the return channel 31, which is convenient for assembly and facilitates the airflow in the return channel 31 to flow smoothly to the return air area 111 of the fan cavity 11.

[0088] 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 "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0089] The above description is only a preferred embodiment of the present application and is 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 air duct structure, characterized in that, include: A housing, wherein an air flow channel is formed in the housing, and the air flow channel at least includes: a fan chamber and a diffuser chamber; The housing has a volute tongue located at the junction of the fan cavity and the pressure diffuser cavity, and a return flow channel located on the side of the volute tongue away from the air flow channel. The fan cavity is provided with a fan, and the fan drives the external air flow into the fan cavity. The volute tongue guides at least part of the air flow from the fan cavity into the pressure diffuser cavity. The return flow channel connects the pressure diffuser cavity and the fan cavity, and guides at least part of the air flow from the pressure diffuser cavity back to the fan cavity. The housing at least comprises: a head and a flow guide; The portion of the head facing the airflow channel is at least configured as the volute tongue, and the portion of the head facing away from the airflow channel is at least configured as a first return air surface, and the first return air surface extends from the diffuser cavity to the fan cavity; The guide portion has a second return air surface spaced apart corresponding to the first return air surface, a first opening and a second opening are formed between the first return air surface and the second return air surface, the first opening faces the diffuser cavity, the second opening faces the fan cavity, and the return flow channel extends from the first opening to the second opening.

2. The air duct structure according to claim 1, characterized in that: The housing at least comprises a first housing, the first housing at least comprises the guide portion and a first plate, the first plate integrally extends from the guide portion toward the downstream of the airflow, and the first plate at least is configured as a portion of the bottom wall of the diffuser cavity; The head is independently arranged from the first shell, the second return air surface of the air guide portion is spaced apart from the first return air surface on the side away from the air flow channel, and the first opening, the return flow channel and the second opening are surrounded by the first return air surface and the second return air surface.

3. The air duct structure according to claim 1, wherein: The shell at least includes a first shell, the first shell at least includes the head and a first plate, the first plate is integrally extended from the head toward the downstream of the airflow, and the first plate is at least configured as a part of the bottom wall of the diffuser cavity, and the first opening is formed through the bottom wall of the diffuser cavity; The guide portion is independently arranged with respect to the first shell, and the guide portion includes a mounting portion and a guiding portion. The mounting portion is fixedly mounted on the first shell at the edge of the first opening, and is spaced apart on the side of the first return air surface away from the air flow channel. The second opening and the return flow channel are surrounded by the first return air surface via the guiding portion.

4. The air duct structure according to claim 1, characterized in that: One of the first return air surface and the second return air surface is provided with at least one guide convex rib, and the other of the first return air surface and the second return air surface is in contact with the at least one guide convex rib.

5. The air duct structure according to claim 4 is characterized in that: The guide convex rib is convexly arranged on the first return air surface and is integrally formed with the first return air surface, and the second return air surface abuts against the guide convex rib; and / or, The guide convex rib is integrally formed with the second air return surface at the first opening, and the first air return surface abuts against the guide convex rib.

6. The air duct structure according to claim 5, characterized in that One of the first return air surface and the second return air surface is provided with a plurality of guide ribs, and the plurality of guide ribs are arranged side by side and at intervals along the transverse direction of the return air channel. The plurality of guide ribs divide the first opening of the return air channel into a plurality of sub-inlets, and the transverse direction of the return air channel is perpendicular to the direction of airflow flowing in the return air channel and perpendicular to the direction from the first return air surface to the second return air surface.

7. The air duct structure according to claim 4, characterized in that, The guide rib extends along the longitudinal direction of the return channel and from the first opening of the return channel to the side where the second opening is located, and the longitudinal direction of the return channel is the direction of airflow in the return channel; One of the first return air surface and the second return air surface is provided with a plurality of the guide ribs, and the plurality of the guide ribs are arranged side by side and at intervals along the transverse direction of the return air channel, and the transverse direction of the return air channel is perpendicular to the direction of airflow flowing in the return air channel and perpendicular to the direction from the first return air surface to the second return air surface.

8. The air duct structure according to claim 7, characterized in that: In the transverse direction of the return channel, the distances between two adjacent guide ribs are equal; or, In the transverse direction of the return channel, the return channel includes a plurality of return air zones arranged side by side, the air flow pressures of two adjacent return air zones are different, the distance between two adjacent guide ribs in the return air zone with larger air flow pressure is a1, the distance between two adjacent guide ribs in the return air zone with smaller air flow pressure is a2, and a2>a1.

9. The air duct structure according to claim 4, characterized in that At least one of the guide ribs provided on one of the first return air surface and the second return air surface has two first surfaces arranged opposite to each other, and the two first surfaces are respectively arranged to be perpendicular or at an obtuse angle to one of the first return air surface and the second return air surface.

10. The air duct structure according to claim 9, wherein The guide rib has a second surface connected between the two first surfaces, and the second surface abuts against the other of the first return air surface and the second return air surface.

11. The air duct structure according to claim 1, characterized in that, In the direction from the first opening of the return channel toward the second opening, the vertical distance between the two first surfaces gradually decreases or remains unchanged.

12. The air duct structure according to claim 1, characterized in that, The head includes a first component and a second component which are independent of each other. The first component forms the volute tongue, the second component forms the first air return surface, and the first component is detachably mounted on the second component.

13. The air duct structure according to claim 12, wherein A first matching portion extends from both ends of the first component toward a side away from the airflow channel, and a second matching portion extends from both ends of the second component toward one side of the airflow channel. The first matching portion of each section is correspondingly overlapped with the outer side of each second matching portion, wherein the first matching portion at one end faces the pressure diffuser cavity to form a part of the bottom wall of the pressure diffuser cavity, and the first matching portion at the other end faces the return flow channel to form a part of the first return air surface.

14. The air duct structure according to claim 13, wherein, At least one first protrusion is formed on the surface of the first matching portion facing the guide portion, and a plurality of second protrusions are formed on the surface of the second component facing the guide portion, and each of the first protrusions is connected with one of the second protrusions to form a guide rib.

15. The air duct structure according to claim 14, characterized in that, The air duct structure also includes a plurality of clamping blocks, each of which is protruding from one of the guide ribs and is integrally formed with the guide rib; the second return air surface is provided with a plurality of clamping openings, each of which is plugged into one of the clamping openings.

16. The air duct structure according to claim 14, characterized in that, The air duct structure further includes a plurality of card blocks, each of which is integrally formed on one of the second protrusions, and the card block extends to fit the surface of the first protrusion that is butted against the second protrusion.

17. An indoor unit, characterized in that, It comprises the air duct structure as described in any one of claims 1 to 16 above.

18. A heating, ventilation and air conditioning (HVAC) installation, characterized in that, The indoor unit comprises the indoor unit as claimed in any one of claim 17.

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