Air conditioner

Abstract

The application discloses an air conditioner, and relates to the technical field of air conditioners. The air conditioner comprises an indoor unit, the indoor unit comprises an air duct shell, a fan and an air outlet net cover, the air duct shell comprises a flow guide cylinder, an impeller of the fan is arranged in the flow guide cylinder, and an extension surface of the air duct shell is arranged on an air outlet side of the flow guide cylinder and connected with the flow guide cylinder. An air outlet area formed by a grid assembly comprises a first air outlet area and a second air outlet area, wherein a projection of an air outlet of the flow guide cylinder in the axial direction of the impeller coincides with the first air outlet area, and the second air outlet area is located at the periphery of the first air outlet area. The extension surface and the grid assembly of the second air outlet area are arranged in the axial direction of the impeller, so as to form a uniform temperature cavity which is connected with the flow guide cylinder. In the application, the airflow sent out from the flow guide cylinder can be diffused radially outward to the uniform temperature cavity between the extension surface and the grid assembly, and then is transported outward along the axial direction of the flow guide cylinder through the grid assembly, so that condensation is not easily generated on the air outlet net cover, and the air volume is improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more specifically, to an air conditioner. Background Technology

[0002] In related technologies, the air supply device of an air conditioner's indoor unit includes an axial flow fan, a duct housing, and an air outlet grille. The fan is housed within the duct housing, and airflow is delivered through the duct housing and the air outlet grille. However, in these related technologies, the air outlet area of ​​the air outlet grille is located in the center of the grille, and the shape and size of this area are similar to the shape and size of the duct's air outlet. Therefore, the airflow is overly concentrated in the center of the grille, resulting in significant momentum loss as the airflow passes through it, uneven airflow velocity distribution in the central area, and a small air delivery range. Furthermore, condensation easily forms in other parts of the grille outside its outlet area, such as at sealing structures. Utility Model Content

[0003] The problem addressed in this application is how to improve the air delivery performance of the indoor unit of an air conditioner and reduce condensation.

[0004] To solve the above problems, this application provides an air conditioner, including an indoor unit. The indoor unit includes a duct housing, a fan, and an air outlet screen. The duct housing includes a guide tube, the fan includes an impeller, the impeller is located inside the guide tube, and the air outlet screen faces the impeller and is disposed on the air outlet side of the guide tube. The air outlet cover includes a grille assembly, and the air outlet area formed by the grille assembly includes a first air outlet area and a second air outlet area. The projection of the air outlet of the guide tube along the impeller axis coincides with the first air outlet area, and the second air outlet area is located outside the first air outlet area. The duct housing also has an extension surface located on the air outlet side of the guide tube and connected to the guide tube. The extension surface and the grille assembly of the second air outlet area are spaced apart in the axial direction of the impeller to form a uniform temperature cavity connected to the guide tube.

[0005] In this embodiment, the air outlet area of ​​the air outlet shroud not only covers the air outlet of the guide tube but also the extended surface. The grille assembly opposite the extended surface also assists in air outlet. Therefore, the air outlet shroud has a large air outlet area, reducing its obstruction of airflow and improving air volume. The airflow from the guide tube can diffuse radially outward to the temperature equalization cavity between the extended surface and the grille assembly, and then be transported outward along the impeller axis through the grille assembly. Since the grille assembly opposite the extended surface also assists in air outlet, hot air outside the air outlet shroud is less likely to approach the grille assembly opposite the extended surface. Therefore, compared to setting the air outlet shroud opposite the extended surface as an airtight sealing structure, condensation is less likely to occur on the air outlet shroud in this embodiment.

[0006] In an optional embodiment, the duct housing further includes an outer air guide surface, and an extension surface is connected to the guide tube via the outer air guide surface. The projections of the outer air guide surface and the extension surface along the impeller axis fall into the second air outlet area. One end of the outer air guide surface is connected to the air outlet end of the guide tube, and the other end extends along the impeller axis and expands outward in the impeller radial direction to connect with the extension surface.

[0007] By incorporating an external air guide surface, a portion of the airflow exiting the guide tube is guided to flow smoothly into the temperature equalization chamber, and then exited by the grille assembly. The external air guide surface improves airflow smoothness, which helps reduce wind resistance and noise.

[0008] In an optional implementation, the outer air guide surface is a conical surface or a radially outward curved surface. Whether it is a conical surface or an outwardly curved surface, it can effectively guide a portion of the airflow into the temperature uniform cavity.

[0009] In an optional embodiment, the air outlet grille further includes a frame, and a grille assembly is disposed within the frame, the grille assembly including a first grille and a second grille.

[0010] In an optional embodiment, the first grid includes a plurality of concentrically arranged annular ribs and a plurality of first radial ribs disposed between the annular ribs; The second grille includes multiple second radial ribs, one end of which is connected to the outermost annular rib, and the other end is connected to the frame.

[0011] By setting annular ribs and first radial ribs to form the first grille, a reliable structure and safety can be ensured in the area directly opposite the air outlet of the guide tube on the grille assembly. By setting second radial ribs, the reliability and protective properties of the second grille can be ensured.

[0012] In an optional embodiment, the first grille and the air outlet of the guide tube are opposite each other in the axial direction of the impeller, the diameter D1 of the outermost annular rib is not greater than the inner diameter D2 of the air outlet of the guide tube, the second grille and the extended surface are spaced apart in the axial direction of the impeller, and the temperature uniform cavity is formed between the second grille and the extended surface.

[0013] The first grille is the portion of the grille assembly opposite the air outlet of the guide tube, used to form at least a portion of the first air outlet area. Most of the airflow from the guide tube is directly delivered by the first grille. The second grille is located around the first grille, forming a uniform temperature cavity between itself, the extended surface, and the outer air guide surface, allowing the gas within the uniform temperature cavity to be discharged outwards, preventing condensation. Typically, to ensure strength, the first grille is higher than the second grille in the impeller axial direction. Therefore, the diameter of the outermost annular rib is smaller than the inner diameter of the guide tube outlet, preventing the first grille from opposing the extended surface and compressing the space of the uniform temperature cavity.

[0014] In an optional embodiment, the diameter D1 of the outermost annular rib is smaller than the inner diameter D2 of the air outlet of the guide tube, and the second radial rib extends from the second air outlet area to the first air outlet area and connects to the outermost annular rib. In this case, the second grille is used to form the second air outlet area and a portion of the first air outlet area.

[0015] In an optional embodiment, the centers of the annular ribs and the air outlet of the guide tube are both located on the axis of the impeller. The diameter D1 of the outermost annular rib and the inner diameter D2 of the air outlet of the guide tube satisfy the condition: 0.9 ≤ D1 / D2 ≤ 1. By reasonably setting the ratio of the diameter of the outermost annular rib to the inner diameter of the air outlet of the guide tube, the airflow that is delivered directly from the air outlet screen without passing through the temperature equalization chamber can be delivered through the first grille as much as possible, thereby ensuring that this airflow is more uniform. At the same time, it can also avoid the reliability and safety of the air outlet screen being reduced due to the area of ​​the first grille being too small.

[0016] In an optional embodiment, the height of the first radial rib in the axial direction of the impeller is t1, the height of the second radial rib in the axial direction of the impeller is t2, and the height of the impeller blades in the axial direction of the impeller is H. Wherein, 0.15*H≤t1≤0.25*H, and / or, 0.08*H≤t2≤0.15*H.

[0017] By appropriately setting the height ratios of the first radial rib to the blade and the second radial rib to the blade, the overall structural strength of the first grille can be ensured to meet the requirements. The second grille is used for auxiliary airflow, therefore its flow rate is smaller than that of the first grille, and since the second grille is not directly opposite the impeller, the safety risk is lower. Therefore, the structural strength requirements for the second radial rib are less stringent, and its height can be appropriately reduced, thus ensuring that the temperature uniformity chamber has sufficient height.

[0018] In an optional embodiment, the duct housing further includes an outer air guide surface, one end of which is connected to the air outlet of the guide tube, and the other end extends along the axial direction of the impeller and expands outward in the radial direction of the impeller to connect with the extension surface. The height of the temperature uniform cavity in the axial direction of the impeller is d1, the height of the outer air guide surface in the axial direction of the impeller is d2, and the height of the second radial rib in the axial direction of the impeller is t2. Where d1 > 1.5 * t2, and / or 1.5 * t2 ≤ d2 ≤ 2 * t2.

[0019] By setting the height of the temperature equalization cavity to be greater than 1.5 times the height of the second radial rib, the temperature equalization cavity has sufficient size, allowing more airflow to be transported outward through the temperature equalization cavity and the second grille, thus improving the uniformity of the air outlet shroud. By reasonably setting the axial height of the outer air guide surface, the outer air guide surface can have a better guiding effect on the airflow, allowing more airflow to enter the temperature equalization cavity.

[0020] In an optional implementation, the frame is rectangular, and the first and second grilles together form a rectangular air outlet area. By setting the frame to be rectangular, the second grilles are distributed at least on the inner sides of the four corners of the frame, and a temperature uniform cavity can be formed at the four corner positions of the air outlet mesh cover.

[0021] In an optional embodiment, the first radial rib bends circumferentially around the annular rib, and the bending direction of the first radial rib is opposite to the rotation direction of the impeller. This arrangement improves the concentration of the airflow delivered by the first grille and increases the air delivery distance.

[0022] The second radial rib extends in a straight radial direction along the impeller; and / or the minimum spacing between two adjacent second radial ribs is 10 mm or more.

[0023] This design reduces the wind resistance of the second radial ribs and increases the airflow of the second grille. Since the second grille is not directly opposite the impeller, even if a user inserts their finger through the grille, they are unlikely to touch the impeller, thus minimizing the safety risk. Therefore, the spacing of the second radial ribs can be appropriately increased to improve airflow efficiency.

[0024] In an optional embodiment, the second grid further includes arc-shaped ribs connected to a plurality of second radial ribs. By providing arc-shaped ribs, the overall structural strength of the second grid can be improved. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the air outlet grille of an indoor air conditioning unit in related technologies; Figure 2 This is a first schematic diagram of the air supply device of an air conditioner indoor unit in one embodiment of this application; Figure 3 This is an exploded view of the air supply device of an air conditioner indoor unit in one embodiment of this application; Figure 4 This is a second schematic diagram of the air supply device of an air conditioner indoor unit in one embodiment of this application; Figure 5 This is a schematic diagram of the air outlet grille of an indoor air conditioner unit in one embodiment of this application; Figure 6 for Figure 2 A sectional view along direction A. Figure 7This is a simulation diagram of the wind speed distribution at the corner of the air outlet grille in related technologies; Figure 8 A simulation diagram of wind speed distribution at the corner of the air outlet grille provided in this embodiment of the application.

[0026] Explanation of reference numerals in the attached drawings: 100-Duct housing; 110-Guide tube; 120-Extension surface; 121-Temperature uniform cavity; 130-Outer air guide surface; 200-Outlet grille; 210-Frame; 220-First grille; 221-Annular rib; 222-First radial rib; 223-Third radial rib; 230-Second grille; 231-Second radial rib; 232-Arc-shaped rib; 240-Central truncated cone; 300-Impeller; 310-Hub; 320-Blade. Detailed Implementation

[0027] In related technologies, the air outlet area of ​​the air outlet grille of the indoor unit of an air conditioner is located in the middle of the grille, and the shape and size of the air outlet area are similar to the shape and size of the air outlet of the air duct. The area outside the middle air outlet area but inside the frame is sealed off to prevent airflow. For example, ... Figure 1 As shown, in the rectangular air outlet grille, only the central circular grille, composed of radial and annular ribs, is used for air outlet, while the four corner areas are sealed off and airtight. Therefore, the airflow is concentrated in the center of the air outlet grille, resulting in significant momentum loss as it passes through. Furthermore, when the air outlet grille is cooled by cold air, condensation will form on the outer surface of the sealed structure when the warm air outside the grille comes into contact with it, negatively impacting the user experience.

[0028] Therefore, this application provides an indoor air conditioner unit that increases the area of ​​the grille assembly by setting a gap between the grille assembly and the air guide tube of the air outlet cover, thereby reducing the wind resistance of the air outlet cover, improving the air outlet efficiency, and reducing condensation.

[0029] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0030] Figure 2 This is a first schematic diagram of the air supply device of an air conditioner indoor unit in one embodiment of this application; Figure 3 This is an exploded view of the air supply device of an air conditioner indoor unit in one embodiment of this application; Figure 4 This is a second schematic diagram of the air supply device of an air conditioner indoor unit in one embodiment of this application. Figures 2 to 4As shown, this application embodiment provides an indoor air conditioning unit, which includes an air supply device. The air supply device includes a duct housing 100, a fan, and an air outlet screen 200. The duct housing 100 includes a guide tube 110. The fan includes an impeller 300, which is located inside the guide tube 110 and coaxially arranged with the guide tube 110. In this application, the fan is an axial flow fan, and the fan also includes a motor for driving the impeller 300 to rotate. The air outlet screen 200 is disposed in the duct housing 100, specifically on the air outlet side of the guide tube 110 and directly opposite the impeller 300. The air outlet screen 200 includes a frame 210 and a grille assembly disposed within the frame 210. The air outlet area formed by the grille assembly includes a first air outlet area and a second air outlet area. The projection of the air outlet of the guide tube 110 along the axial direction of the impeller 300 coincides with the first air outlet area, and the second air outlet area is located outside the first air outlet area. In this application, the duct housing 100 further has an extension surface 120, which is located on the air outlet side of the guide tube 110 and connected to the guide tube. The extension surface 120 and the grille assembly of the second air outlet area are spaced apart axially from the impeller 300 to form a temperature uniform cavity 121 communicating with the guide tube 110. In this embodiment, the frame 210 of the air outlet screen 200 is sealed to the duct housing 100.

[0031] In this embodiment, the air outlet area of ​​the air outlet cover 200 not only covers the air outlet of the guide tube 110, but also covers the extended surface 120. The grille assembly opposite to the extended surface 120 can also assist in air outlet. Therefore, the air outlet cover 200 has a large air outlet area, reducing the obstruction effect of the air outlet cover 200 on the airflow and helping to increase the air volume. The airflow delivered from the guide tube 110 can diffuse radially outward to the temperature equalization cavity 121 between the extended surface 120 and the grille assembly, and then be transported outward along the axial direction of the impeller 300 through the grille assembly. Since the grille assembly opposite to the extended surface 120 can also assist in air outlet, the hot air outside the air outlet cover 200 is not easily approached by the grille assembly opposite to the extended surface 120. Therefore, compared with setting the air outlet cover 200 opposite to the extended surface 120 as an airtight sealing structure, condensation is less likely to occur on the air outlet cover 200 in this embodiment. Optionally, the extension surface 120 is arranged perpendicular to the axial direction of the impeller 300.

[0032] In this embodiment, the duct housing 100 further includes an outer air guide surface 130. An extension surface 120 is connected to the guide tube 110 via the outer air guide surface 130. One end of the outer air guide surface 130 in the axial direction of the impeller 300 is connected to the outlet end of the guide tube 110, and the other end extends axially and expands radially. The extension surface 120 is connected to the end of the outer air guide surface 130 away from the guide tube 110. The projections of the outer air guide surface 130 and the extension surface 120 in the axial direction of the impeller 300 fall into the second air outlet area. The guide tube 110 can be cylindrical, i.e., having a consistent inner diameter in the airflow direction; or, the guide tube 110 can have a certain degree of contraction or expansion in the airflow direction. By providing the outer air guide surface 130, a portion of the airflow delivered from the outlet of the guide tube 110 can be guided by the outer air guide surface 130, thereby smoothly flowing into the temperature equalization chamber 121, and then being delivered by the grille assembly. The external air guide surface 130 can improve the smoothness of airflow, which helps to reduce wind resistance and noise.

[0033] In an optional embodiment, the outer air guide surface 130 is a conical surface or a radially outward curved surface. Whether it is a conical surface or an outwardly curved surface, it can effectively guide a portion of the airflow to the temperature uniform cavity 121.

[0034] Figure 5 This is a schematic diagram of the air outlet grille 200 of an air conditioner indoor unit in one embodiment of this application. Figure 5 As shown, in this embodiment, the frame 210 of the air outlet cover 200 is rectangular; further, the frame 210 is square. The second grille 230 is distributed at least on the inner sides of the four corners of the frame 210, so that a uniform temperature cavity 121 can be formed at the four corner positions of the air outlet cover 200. The grille assembly includes a first grille 220 and a second grille 230. The first grille 220 includes a plurality of concentrically arranged annular ribs 221 and a plurality of first radial ribs 222 disposed between the annular ribs 221. The second grille 230 includes a plurality of second radial ribs 231, one end of which is connected to the outermost annular rib 221, and the other end is connected to the frame 210. The first grille 220 and the air outlet of the guide tube 110 are opposite each other in the axial direction of the impeller 300, and the second grille 230 and the extension surface 120 are spaced apart in the axial direction of the impeller 300, forming a uniform temperature cavity 121 between the second grille 230 and the extension surface 120. In this embodiment, the center of the annular rib 221 is located on the axis of the guide tube 110.

[0035] The first grille 220 is formed by setting annular ribs 221 and first radial ribs 222, ensuring a reliable structure and safety in the area directly opposite the air outlet of the guide tube 110 on the grille assembly. The second grille 230 is located around the first grille 220, forming a temperature uniform cavity 121 between itself and the extended surface 120, allowing gas from the temperature uniform cavity 121 to be discharged outwards, preventing condensation. In this embodiment, the second grille 230 also includes arc-shaped ribs 232, which are connected to multiple second radial ribs 231, thereby improving the overall structural strength of the second grille 230. Specifically, the second grille 230 includes four arc-shaped ribs 232, which are connected to multiple second radial ribs 231, with each end of the arc-shaped rib 232 connected to two adjacent sides of the frame 210. The arc-shaped ribs 232 enhance the reliability of the second grille 230 and prevent deformation of the second radial ribs 231. Optionally, the center of curvature of the arc-shaped rib 232 coincides with the center of the annular rib 221.

[0036] In this embodiment, the first radial rib 222 bends circumferentially around the annular rib 221, and the bending direction of the first radial rib 222 is opposite to the rotation direction of the impeller 300. In other words, each of the first radial ribs 222 extends radially and bends circumferentially, and the bending direction of each of the first radial ribs 222 is consistent. This arrangement improves the concentration of the air delivered by the first grille 220 and increases the air delivery distance. Optionally, the second radial rib 231 extends linearly along the radial direction of the impeller 300, which reduces the wind resistance of the second radial rib 231 and increases the air volume of the second grille 230.

[0037] In other optional embodiments, the frame 210 can also be circular, elliptical, or other shapes. For example, the frame 210 is circular with a diameter larger than the diameter of the air outlet of the guide tube 110, and the second grille 230 is disposed in the annular area inside the frame 210; the extended surface 120 is annular and spaced from the annular second grille 230 to form an annular temperature uniform cavity 121 surrounding the air outlet end of the guide tube 110.

[0038] like Figure 5As shown, in this embodiment, the first grille 220 has five annular ribs 221, and a plurality of first radial ribs 222 arranged in a circular array are provided between any two adjacent annular ribs 221. In other optional embodiments, the number of annular ribs 221 can be increased or decreased as needed. In addition, in this embodiment, the air outlet screen 200 also includes a central frustum 240, which is coaxially arranged with the guide tube 110, and the central frustum 240 is connected to the innermost annular rib 221 by a third radial rib 223. In this embodiment, the impeller 300 includes a hub 310 and a plurality of blades 320 disposed on the outer periphery of the hub 310. The area where the third radial rib 223 and the central frustum 240 are located is directly opposite the hub 310 in the axial direction of the impeller 300. Therefore, the central frustum 240 has a relatively small impact on the air outlet.

[0039] Figure 6 for Figure 2 A sectional view along direction A. (Combined with...) Figures 2 to 6 The height of the first radial rib 222 in the axial direction of the impeller 300 is t1, the height of the second radial rib 231 in the axial direction of the guide tube 110 is t2, and the height of the blade 320 of the impeller 300 in the axial direction of the impeller 300 is H. Optionally, 0.15*H≤t1≤0.25*H. In this embodiment, the height t1 of the first radial rib 222 in the axial direction of the impeller 300 is 0.2H. By reasonably setting the height ratio of the first radial rib 222 to the blade 320, the overall structural strength of the first grid 220 can be guaranteed to meet the requirements.

[0040] Further optionally, 0.08*H ≤ t2 ≤ 0.15*H. In this embodiment, the height of the second radial rib 231 in the axial direction of the impeller 300 is t2, which is 0.1H. Since the second grille 230 is used to assist in air outlet, its flow rate is smaller than that of the first grille 220, and the second grille 230 is not directly opposite the impeller 300, resulting in a lower safety risk. Therefore, the structural strength requirement for the second radial rib 231 is less, and the height of the second radial rib 231 can be appropriately reduced, thus ensuring that the temperature uniform cavity 121 has sufficient height. It should be understood that in other optional embodiments, the heights of the first radial rib 222 and the second radial rib 231 can be set to be the same, for example, the heights of both the first radial rib 222 and the second radial rib 231 are 0.15H.

[0041] Furthermore, in this embodiment, the minimum spacing between two adjacent second radial ribs 231 is 10mm or more. Since the second grille 230 is not directly opposite the impeller 300, even if a user's finger is inserted through the second grille 230, it is unlikely to come into contact with the impeller 300, thus reducing the safety risk. Therefore, the spacing between the second radial ribs 231 can be appropriately increased to improve airflow efficiency.

[0042] Optionally, the first radial rib 222 and the second radial rib 231 are coplanar on the side of the impeller 300 away from the impeller 300 (i.e., the air outlet side) in the axial direction. Therefore, when the axial height of the second radial rib 231 is equal to the axial height of the first radial rib 222, the first radial rib 222 and the second radial rib 231 are also coplanar on the side of the impeller 300 closer to the impeller 300 (i.e., the windward side) in the axial direction; when the axial height of the second radial rib 231 is less than the axial height of the first radial rib 222, the windward side of the second radial rib 231 is farther away from the impeller 300 relative to the windward side of the first radial rib 222, thereby increasing the size of the temperature uniform cavity 121.

[0043] Optionally, the first grille 220 and the air outlet of the guide tube 110 are opposite each other in the axial direction of the impeller 300, and the diameter D1 of the outermost annular rib is not greater than the inner diameter D2 of the air outlet of the guide tube 110; the second grille and the extended surface are spaced apart in the axial direction of the impeller 300, and a temperature equalization cavity is formed between the second grille and the extended surface. In other words, the first grille 220 forms at least a part of the first air outlet area, and the second grille 230 forms the second air outlet area.

[0044] In an optional embodiment, the diameter D1 of the outermost annular rib 221 is smaller than the inner diameter D2 of the air outlet of the guide tube 110, and the second radial rib 231 extends from the second air outlet area to the first air outlet area and connects to the outermost annular rib 221. In this case, the second grille 230 is used to form the second air outlet area and a portion of the first air outlet area.

[0045] In this embodiment, the first grille 220 is the portion of the grille assembly opposite the air outlet of the guide tube 110, used to form at least a portion of the first air outlet area. Most of the airflow from the guide tube 110 is directly delivered by the first grille 220. The second grille 230 is disposed around the first grille 220, forming a temperature uniform cavity 121 between itself and the extended surface 120, and allowing the gas in the temperature uniform cavity 121 to be delivered outwards, preventing condensation. In some embodiments, to ensure strength, the height of the first grille 220 in the axial direction of the impeller 300 is greater than that of the second grille 230. Therefore, the diameter of the outermost annular rib 221 is smaller than the inner diameter of the air outlet of the guide tube 110, preventing the first grille 220 from compressing the space of the temperature uniform cavity 121 due to its opposition to the extended surface 120.

[0046] Optionally, the ratio of the diameter D1 of the outermost annular rib 221 to the inner diameter D2 of the air outlet of the guide tube 110 satisfies 0.9 ≤ D1 / D2 ≤ 1. In this embodiment, D1 / D2 is 0.95, in other words, the first grille 220 forms part of the first air outlet area, and the second grille 230 forms another part of the first air outlet area and the second air outlet area. By reasonably setting the ratio of the diameter of the outermost annular rib 221 to the inner diameter of the air outlet end of the guide tube 110, the airflow that is sent directly from the air outlet cover 200 without passing through the temperature equalization chamber 121 can be sent out through the first grille 220 as much as possible, thereby ensuring that this part of the airflow is more uniform, and at the same time, it can also avoid the reliability and safety of the air outlet cover 200 being deteriorated due to the area of ​​the first grille 220 being too small.

[0047] Optionally, the height of the temperature equalization cavity 121 in the axial direction of the impeller 300 is d1, where d1 > 1.5 * t2, and t2 is the height of the second radial rib 231 in the axial direction of the impeller 300. In this embodiment, d1 = 1.6 * t2. By setting the height d1 of the temperature equalization cavity 121 to be greater than 1.5 times the height t2 of the second radial rib 231, the temperature equalization cavity 121 has sufficient size, allowing more airflow to be transported outward through the temperature equalization cavity 121 and the second grille 230, thereby improving the uniformity of the air outlet of the air outlet cover 200.

[0048] Optionally, the height of the outer air guide surface 130 in the axial direction of the impeller 300 is d2, and optionally, 1.5*t2≤d2≤2*t2. In this embodiment, d2=1.7*t2. By reasonably setting the height of the outer air guide surface 130 in the axial direction, the outer air guide surface 130 can have a better guiding effect on the airflow, allowing more airflow to enter the temperature uniform cavity 121.

[0049] The air supply device and its application in this embodiment Figure 1 The air supply device of the air outlet mesh cover 200 was tested for air volume, and the air volume was found to be 3018 m³ / min at a fan speed of 750 r / min. 3 / h and 2728m 3 / h. It is evident that the air supply device provided in this embodiment has higher air supply efficiency.

[0050] Figure 7 This is a simulation diagram of the wind speed distribution at the 200° corner of the air outlet grille in the relevant technology; Figure 8 This is a simulation diagram of the wind speed distribution at the corner position of the air outlet mesh cover 200 provided in this embodiment of the application. Figure 7 and Figure 8As can be seen, in related technologies, the flow velocity at the corner sealing structure is relatively slow due to the presence of the corner sealing structure, making it prone to condensation. However, in this embodiment, the original sealing structure is replaced by a second grille 230, and the corner of the air outlet cover 200 also participates in the air outlet. The hot air outside the air outlet cover 200 is difficult to approach the corner of the air outlet cover 200, thus making it less prone to condensation.

[0051] It should be understood that the indoor unit of the air conditioner provided in this application embodiment should also include other necessary components for realizing its function, such as heat exchangers, control components, etc. In addition to the indoor unit, the air conditioner also includes an outdoor unit. The arrangement and principles of other related structures of the air conditioner can be referred to the prior art, and will not be repeated here. In this application, the indoor unit of the air conditioner can be either a portable air conditioner indoor unit or a cabinet air conditioner indoor unit.

[0052] In summary, this application provides an air conditioner including an indoor unit. The indoor unit includes a duct housing 100, a fan, and an air outlet grille 200. The duct housing 100 includes a guide tube 110, and the fan includes an impeller 300 located inside the guide tube 110. The air outlet grille 200 faces the impeller 300 and is disposed on the air outlet side of the guide tube 110. The air outlet grille 200 includes a grille assembly, and the air outlet area formed by the grille assembly includes a first air outlet area and a second air outlet area. The air outlet of the guide tube 110 is projected along the axial direction of the impeller 300 to coincide with the first air outlet area, and the second air outlet area is located outside the first air outlet area. The duct housing 100 also has an extension surface 120, which is located on the air outlet side of the guide tube 110 and connected to the guide tube 110. The extension surface 120 and the grille assembly of the second air outlet area are spaced apart along the axial direction of the impeller 300 to form a uniform temperature cavity 121 connected to the guide tube 110. In this embodiment, the air outlet area of ​​the air outlet screen 200 not only covers the air outlet of the guide tube 110, but also covers the extension surface 120. The grille assembly opposite to the extension surface 120 can also assist in air outlet. Therefore, the air outlet screen 200 has a large air outlet area, which reduces the obstruction effect of the air outlet screen 200 on the airflow and helps to increase the air volume. The airflow delivered from the guide tube 110 can diffuse radially outward to the temperature equalization cavity 121 between the extension surface 120 and the grille assembly, and then be transported outward along the axial direction of the guide tube 110 through the grille assembly. Since the grille assembly opposite to the extension surface 120 can also assist in air outlet, the hot air outside the air outlet cover 200 is not easily approached by the grille assembly opposite to the extension surface 120. Therefore, compared to setting the air outlet cover 200 opposite to the extension surface 120 as an airtight sealing structure, condensation is less likely to occur on the air outlet cover 200 in this embodiment.

[0053] While this application discloses the above information, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of this application; therefore, the scope of protection of this application shall be determined by the scope defined in the claims.

Claims

1. An air conditioner, comprising an indoor unit, characterized in that, The indoor unit includes a duct housing (100), a fan, and an air outlet screen (200). The duct housing (100) includes a guide tube (110), the fan includes an impeller (300), the impeller (300) is located inside the guide tube (110), and the air outlet screen (200) is located opposite the impeller and is disposed on the air outlet side of the guide tube. The air outlet cover (200) includes a grille assembly, and the air outlet area formed by the grille assembly includes a first air outlet area and a second air outlet area. The projection of the air outlet of the guide tube (110) along the axial direction of the impeller (300) coincides with the first air outlet area, and the second air outlet area is located outside the first air outlet area. The duct housing also has an extension surface (120), which is located on the air outlet side of the guide tube (110) and connected to the guide tube (110). The extension surface (120) and the grille assembly of the second air outlet area are spaced apart in the axial direction of the impeller (300) to form a uniform temperature cavity (121) connected to the guide tube (110).

2. The air conditioner according to claim 1, characterized in that, The duct housing (100) also includes an outer air guide surface (130). The extended surface (120) is connected to the guide tube (110) through the outer air guide surface (130). The projection of the outer air guide surface and the extended surface along the impeller axis falls into the second air outlet area. One end of the outer air guide surface (130) is connected to the air outlet end of the guide tube (110), and the other end extends along the impeller (300) axis and expands outward in the impeller (300) radially to connect with the extended surface (120).

3. The air conditioner according to claim 1, characterized in that, The air outlet cover (200) also includes a frame (210), and the grille assembly is disposed within the frame (210). The grille assembly includes a first grille (220) and a second grille (230).

4. The air conditioner according to claim 3, characterized in that, The first grid (220) includes a plurality of concentrically arranged annular ribs (221) and a plurality of first radial ribs (222) disposed between the annular ribs (221); The second grille (230) includes a plurality of second radial ribs (231), one end of which is connected to the outermost annular rib (221), and the other end is connected to the frame (210).

5. The air conditioner according to claim 4, characterized in that, The first grille (220) and the air outlet of the guide tube (110) are opposite each other in the axial direction of the impeller (300). The diameter D1 of the outermost annular rib is not greater than the inner diameter D2 of the air outlet of the guide tube (110). The second grille (230) and the extended surface (120) are spaced apart in the axial direction of the impeller (300). The temperature uniform cavity (121) is formed between the second grille (230) and the extended surface (120).

6. The air conditioner according to claim 5, characterized in that, The outermost annular rib (221) has a diameter D1 smaller than the inner diameter D2 of the air outlet of the guide tube (110). The second radial rib (231) extends from the second air outlet area to the first air outlet area and connects to the outermost annular rib (221).

7. The air conditioner according to claim 5, characterized in that, The center of the annular rib (221) and the air outlet of the guide tube are both located on the axis of the impeller (300). The diameter D1 of the outermost annular rib (221) and the inner diameter D2 of the air outlet of the guide tube (110) satisfy: 0.9≤D1 / D2≤1.

8. The air conditioner according to any one of claims 4-7, characterized in that, The height of the first radial rib (222) in the axial direction of the impeller (300) is t1, the height of the second radial rib (231) in the axial direction of the impeller (300) is t2, and the height of the blade (320) of the impeller (300) in the axial direction of the impeller (300) is H; Wherein, 0.15*H≤t1≤0.25*H, and / or, 0.08*H≤t2≤0.15*H.

9. The air conditioner according to any one of claims 4-7, characterized in that, The duct housing (100) further includes an outer air guide surface (130), one end of which is connected to the air outlet of the guide tube (110), and the other end extends along the axial direction of the impeller (300) and expands outward in the radial direction of the impeller (300) to connect with the extension surface (120). The height of the temperature uniform cavity (121) in the axial direction of the impeller (300) is d1, the height of the outer air guide surface (130) in the axial direction of the impeller (300) is d2, and the height of the second radial rib (231) in the axial direction of the impeller (300) is t2. Where d1 > 1.5 * t2, and / or 1.5 * t2 ≤ d2 ≤ 2 * t2.

10. The air conditioner according to claim 3, characterized in that, The frame (210) is rectangular, and the first grille (220) and the second grille (230) together form the rectangular air outlet area.

11. The air conditioner according to any one of claims 4-7, characterized in that, The first radial rib (222) bends around the annular rib (221) and the bending direction of the first radial rib (222) is opposite to the rotation direction of the impeller (300).

12. The air conditioner according to any one of claims 4-7, characterized in that, The second radial rib (231) extends in a straight radial direction along the impeller (300); and / or, the minimum spacing between two adjacent second radial ribs (231) is more than 10 mm.

13. The air conditioner according to any one of claims 4-7, characterized in that, The second grid (230) also includes arcuate ribs (232) connected to a plurality of second radial ribs (231).

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