Embedded air conditioner indoor unit

Abstract

The application discloses an embedded air conditioner indoor unit, which comprises an indoor unit body, a panel arranged below the indoor unit body, an air return inlet formed in the center of the panel for sucking indoor air, an air outlet formed on the panel outside the air return inlet, a fan for blowing the air sucked by the air return inlet to the air outlet, a damper arranged at the air outlet for opening and closing the air outlet and guiding the discharged air, and an air return grille installed on the panel in a manner of covering the air return inlet, wherein the air return grille comprises a plurality of grille bars close to the air outlet, and free sections of the grille bars extend in a direction away from the air outlet. The air conditioner indoor unit can avoid air return short circuit, keep the resistance of the air return grille to the air inlet in a reasonable range, reduce the vorticity at the air return grille, and avoid the generation of abnormal sound.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to an embedded air conditioning indoor unit. Background Technology

[0002] An air conditioner is a device used to regulate the temperature, humidity, air cleanliness, or airflow of indoor air. Split-type air conditioners consist of an indoor unit and an outdoor unit.

[0003] In common four-way embedded indoor units, the return air vent and the air outlet are on the same plane, and to a large extent, the negative pressure of the return airflow is greater than the dynamic pressure of the outlet airflow. This causes the airflow from the outlet airflow to flow back directly along the return air grille at the return air vent. The outlet and return airflows converge at the return air grille, resulting in higher noise and reduced air delivery distance at the return air grille. Summary of the Invention

[0004] This application provides an embedded air conditioner indoor unit that improves the return air grille to increase the air delivery distance while avoiding short-circuiting of the return air.

[0005] One aspect of this application provides an embedded air conditioner indoor unit, comprising: an indoor unit body; a panel disposed below the indoor unit body; a return air vent with an opening formed in the center of the panel for drawing in indoor air; an air outlet with an opening formed on the panel outside the return air vent; a fan for blowing the air drawn in by the return air vent to the air outlet; blades disposed at the air outlet for opening and closing the air outlet and guiding the exhaust air; a return air grille installed on the panel in a manner capable of covering the return air vent, the grille comprising: a plurality of grille bars, each including a connecting section and a free section, the grille bars extending along the length direction of the air outlet; a connecting strip connecting the connecting sections of the grille bars to form the return air vent; wherein, near the air outlet, the free sections of the grille bars extend obliquely in a direction away from the air outlet.

[0006] In this technical solution, on the embedded air conditioner indoor unit, near the air outlet, the angle between the grille and the return air outlet flowing from the air outlet to the return air grille can be reduced, increasing the resistance of the airflow passing through the return air grille, thereby suppressing the backflow of the airflow and improving the problem of return air short circuit.

[0007] In some embodiments, the obtuse angle formed by the free segment of the grille tilting away from the air outlet satisfies: 105°≤w≤135°.

[0008] In some embodiments, the obtuse angle formed by the free segment of the grille tilting away from the air outlet satisfies: 115°≤w≤135°.

[0009] In some embodiments, the device further includes: an electrical box disposed above the return air grille; wherein the return air grille is located on the area of ​​the electrical box's orthogonal projection, and the grille bars include a first grille bar and a second grille bar, the first grille bar being located on the air inlet side of the grille, and the second grille bar being located on the air outlet side of the return air grille.

[0010] In some embodiments, the electrical box has a guide ramp located at the lower part of the electrical box and close to the axis of the fan.

[0011] In some embodiments, it further includes: an electrical box disposed above the third grille bar, wherein the distance between the electrical box and the third grille bar in the height direction is L2; ​​a plane orthogonal to the height direction of the housing is defined as surface P, and the third grille bar is inclined at an acute angle e relative to surface P, wherein e is positively correlated with L2.

[0012] In some embodiments, the vertical distance L3 from the top of the guide ramp to the bottom surface of the electrical box, and the thickness of the electrical box in the height direction is h, with L3 / h being positively correlated with h.

[0013] In some embodiments, 0.1 ≤ L3 / h ≤ 0.26.

[0014] In some embodiments, the guide ramp is parallel to the free segment of the grille bar.

[0015] In some embodiments, near the center of the return air grille, the free section of the grille bar is perpendicular to the connecting bar.

[0016] In some embodiments, near the air outlet, there is one grille bar, and the free section of the grille bar extends along the air inlet side. Attached Figure Description

[0017] Figure 1 A perspective view of an embedded air conditioner indoor unit according to some embodiments is shown; Figure 2 A bottom view of an embedded air conditioner indoor unit according to some embodiments is shown; Figure 3 A cross-sectional view of an embedded air conditioning indoor unit according to some embodiments is shown; Figure 4 A diagram showing the arrangement of the return air grille and air outlet in an embedded air conditioning indoor unit according to some embodiments is provided. Figure 5 A simulation diagram of airflow at the return air grille and air outlet in a prior art embedded air conditioning indoor unit is shown. Figure 6 A schematic diagram of the first grille bar and the target airflow in a prior art embedded air conditioner indoor unit is shown; Figure 7 A cross-sectional view of a return air grille in a prior art embedded air conditioning indoor unit is shown; Figure 8 A cross-sectional view of a return air grille in an embedded air conditioning indoor unit according to some embodiments is shown; Figure 9 A graph showing the linear relationship between tilt angle ω and horizontal resistance in an embedded air conditioner indoor unit according to some embodiments is shown. Figure 10 A linear relationship between tilt angle ω and vorticity in an embedded air conditioner indoor unit according to some embodiments is shown; Figure 11 and Figure 12 A cross-sectional view of a return air grille and an air outlet in an embedded air conditioning indoor unit according to some embodiments is shown; Figure 13 A linear relationship diagram between L1 / L and air volume in an embedded air conditioning indoor unit according to some embodiments is shown; Figure 14 A schematic diagram of a return air grille and electrical box in an embedded air conditioning indoor unit according to some embodiments is shown; Figure 15 A schematic diagram of a return air grille and electrical box in an embedded air conditioning indoor unit according to some embodiments is shown; Figure 16 The graph shows the linear relationship between angle e and air volume in an embedded air conditioner indoor unit; Figure 17 A schematic diagram of a return air grille and electrical box in an embedded air conditioning indoor unit according to some embodiments is shown; Figure 18 The graph shows the linear relationship between the thickness h of the electrical box in the embedded air conditioner indoor unit and the pressure loss.

[0018] In the above figures, 10 is the shell; 11 is the top wall; 12 is the bottom wall; 13 is the side wall; 14 is the upper shell; 15 is the chassis; 16 is the return air vent; 17 is the air outlet; 181 is the air inlet; 182 is the air outlet; 183 is the intermediate area; 1831 is the first intermediate area; 1832 is the second intermediate area; 20 is the return air grille; 20a is the main flow area; 20b is the secondary main flow area; 21 is the first grille bar; 23 is the third grille bar; 30 is the air guide plate; 40 is the fan; 50 is the heat exchanger; 51 is the water tray; 60 is the target airflow; 70 is the electrical box; 71 is the guide slope; and 72 is the notched space. Detailed Implementation

[0019] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] Reference Figures 1 to 3 An embedded air conditioner indoor unit according to an embodiment of this application includes an indoor unit body and a panel, the panel being disposed below the indoor unit body, and the indoor unit body including a housing 10. The housing 10 forms the general appearance of the embedded air conditioner indoor unit.

[0024] The housing 10 has a top wall 11, a bottom wall 12 and a side wall 13 connecting the top wall 11 and the bottom wall 12.

[0025] The housing 10 includes an upper shell 14 and a chassis 15. The upper shell 10 is box-shaped with an open bottom, and the chassis 15 is connected to the bottom of the upper shell 10.

[0026] The top wall of the upper shell 14 is the top wall 11 of the shell 10, and the side walls of the upper shell 14 are the side walls 13 of the shell 10. The chassis 15 forms the bottom wall 12 of the shell 10.

[0027] The panel is equipped with a return air vent 16 and an air outlet 17. Indoor air enters the housing 10 through the return air vent 16; air inside the housing 10 is discharged into the indoor space through the air outlet 17.

[0028] In some embodiments, the recessed air conditioning indoor unit is a four-way air outlet model. The return air vent 16 is located in the center of the panel, formed by a central opening in the panel, and is used to draw in indoor air; The air outlet is formed by openings on the panel outside the return air inlet, and the four air outlets 17 are located in the four directions on the outer periphery of the return air inlet 16.

[0029] The embedded air conditioner indoor unit includes a return air grille 20, which is located at the return air inlet 16. The return air grille 20 can prevent foreign objects from entering the housing 10.

[0030] The recessed air conditioner indoor unit may include an air guide plate 30 for opening / closing the air outlet 17. The air guide plate 30 is rotatably disposed in the housing 10 and is located at the air outlet 17 for opening and closing the air outlet 17 and guiding the exhaust air.

[0031] The air deflector 30 can move between a closed position and an open position, wherein the air outlet 17 is closed in the closed position and the air outlet 17 is open in the open position and the direction of the air blown from the fan 40 to the air outlet 17 is controlled.

[0032] The direction of airflow in an embedded air conditioner indoor unit can be controlled by moving the air deflector 30 between a closed position and an open position.

[0033] The fan 40 is disposed inside the housing 10 and may be located above the return air grille 20. The fan 40 is used to drive airflow, allowing air to flow from the return air inlet 17 to the air outlet 17. The fan 40 may be a backward centrifugal fan.

[0034] The axis of the backward centrifugal fan is parallel to the height direction of the embedded air conditioner indoor unit, that is, the axis of the backward centrifugal fan is set vertically.

[0035] The recessed air conditioner indoor unit includes a heat exchanger 50. The heat exchanger 50 is disposed inside the housing 10 and surrounds the outer periphery of the fan 40. The heat exchanger 50 is located in the air movement path from the return air vent 16 to the air outlet 17. The heat exchanger 50 is used to absorb heat from or transfer heat to the air introduced into the housing 10.

[0036] The heat exchanger 50 may be ring-shaped. The internal space enclosed by the heat exchanger 50 forms an air inlet chamber 181, and the space between the outer ring of the heat exchanger 50 and the shell 10 forms an air outlet chamber 182. A fan 40 is installed in the air inlet chamber 181, and the air outlet chamber 182 is connected to the air outlet 17.

[0037] The embedded air conditioner indoor unit includes a water tray 51, which is located below the heat exchanger 50 and is used to collect condensate flowing down from the heat exchanger 50.

[0038] The fan 40 draws in air axially and then throws it out radially. The air then exchanges heat with the refrigerant inside the heat exchanger 50 before being blown into the room.

[0039] Because the return air inlet 16 and the outlet air outlet 17 are on the same plane, and the negative pressure of the return airflow is significantly greater than the dynamic pressure of the outlet airflow, the airflow from the outlet air outlet 17 flows directly back into the housing 10 along the return air grille 20. The convergence of the outlet and return airflows at the return air grille 20 causes relatively high noise levels at that location. Furthermore, some of the airflow from the outlet air outlet 17 returns to the return air grille 20, reducing the air delivery distance.

[0040] In the embodiments of this application, reference is made to Figure 4 The return air grille 20 includes multiple grille bars and multiple connecting bars. Air can flow into the housing 10 through the space between the grille bars.

[0041] The grille bar includes connecting sections and free sections, and extends along the length of the air outlet.

[0042] The connecting strip connects the connecting section of the grille strip to form a return air vent; The return air grille 20 has a first grille strip 21 in the area near the air outlet 17, with the same length direction as the air outlet 17.

[0043] Near the air outlet, the free section of the grille bar extends obliquely away from the air outlet.

[0044] Specifically, the grille bars are inclined along the axial direction of the indoor unit body.

[0045] Reference Figure 5 and Figure 6 After studying the airflow at the outlet and the airflow at the return, the inventors discovered that part of the airflow blown out of the outlet 17 usually blows towards the return air grille 20 at an angle of β, with β generally between 105° and 135°.

[0046] For ease of description, the airflow from the air outlet 17 to the return air grille 20 in this application is referred to as the target airflow 60. The β angle is the angle between the target airflow 60 and the height direction.

[0047] Reference Figure 7 Let plane P be the plane orthogonal to the height direction. In the prior art, when projected onto a plane orthogonal to the length direction of the grille bar 21, the grille bar 21 is perpendicular to plane P. Therefore, the angle formed between the grille bar 21 and the target airflow 60 is β. Since the angle β between the grille bar 21 and the target airflow 60 is relatively large, it is more advantageous for the target airflow 60 to enter the housing 10 from the return air grille 20, thereby causing a return air short-circuit and reducing the air supply distance.

[0048] To solve the aforementioned problem of return air short circuit, refer to... Figure 8 In this application, the grille strips 21 are inclined from bottom to top towards the air outlet 17. This reduces the angle between the grille strips 21 and the target airflow 60, increases the return air resistance of the target airflow 60 as it flows through the return air grille 20, thereby suppressing the backflow of the target airflow 60 and improving the problem of return air short-circuiting.

[0049] In addition, compared with the problem in the prior art where the target airflow 60 and the normal intake airflow (the part of the intake airflow excluding the target airflow 60 is called the normal intake airflow) converge at the grille bar 21, resulting in high noise, the grille bar 21 in this application is set at an angle, which can reduce the intake vortex at the grille bar 21 and make the airflow more uniform, thereby reducing the noise at the return air grille 20.

[0050] In some embodiments, the angle between the grid strip 21 and the plane P is w, where w ≤ 135°.

[0051] If w is too large, the angle between the target airflow 60 and the grille bar 21 will be small. Although this can effectively suppress the backflow of the target airflow 60 into the indoor unit, it will affect the normal air intake airflow, that is, reduce the normal air intake airflow entering the housing 10 from the grille bar 21. Therefore, w ≤ 135° can ensure normal air intake below the return air grille 20.

[0052] In some embodiments, the angle w between the grid strip 21 and the plane P is ≥105°.

[0053] If w is too small, the angle between the target airflow 60 and the grille bar 21 will be too large, which will weaken the inhibitory effect of the grille bar 21 on the backflow of the target airflow 60.

[0054] In some embodiments, the angle w between the grille bar 21 and the plane P satisfies 105°≤w≤135°, which can suppress the backflow of the target airflow 60 while ensuring normal air intake below the return air grille 20.

[0055] This application uses numerical simulation to obtain the relationship between w and the change of horizontal resistance to airflow at grid bar 21.

[0056] Figure 9 This graph shows the linear relationship between w and horizontal resistance. As can be seen from the graph, when w > 135°, the horizontal resistance increases sharply, which is not conducive to the normal air intake below the return air grille 20.

[0057] This application uses numerical simulation to obtain the relationship between w and the change in airflow vorticity at grid bar 21.

[0058] Figure 10This graph shows the linear relationship between w and vorticity. As can be seen, the vorticity exhibits a U-shaped distribution. Regardless of whether w > 135° or w < 105°, the vorticity at grille bar 21 increases sharply. This results in severe intake noise at the return air grille, which is amplified through radiation. This abnormal noise at this point increases the overall noise level of the machine. Therefore, this application uses horizontal resistance and vorticity ranges to identify noise sources, and by setting w, the generation of abnormal noise can be avoided.

[0059] Combination Figure 9 and Figure 10 With a radius of 105°≤w≤135°, the horizontal resistance at grille bar 21 is within a reasonable resistance range of 1.5pa~3.2pa, and the vortex is low, which can control the intake noise at grille bar 21 and reduce the noise by 0.9dB (A).

[0060] This application presents a comparative experiment between existing technologies and the embedded air conditioner indoor unit of this application. The experimental data are shown in the table below: Prior art Yes 2120 4.2 (0.3 m / s) 52.4 The present application No 2200 4.9 (0.3 m / s) 51.5 The experimental results show that after tilting the grille bars 21 of the return air grille 20, the air volume of the embedded air conditioner indoor unit increased by 3.8%, the air delivery distance improved by 0.7m, and the noise level improved by 0.9dB. The improvement in noise is mainly due to the improvement in the air intake state, which reduces the vortex when the airflow enters the whole system, thereby suppressing the generation of this noise source.

[0061] In some embodiments, the angle w between the grid strip 21 and the plane P satisfies 115°≤w≤135°.

[0062] from Figure 9 and Figure 10 It can be seen that when w=115°~135°, the vortex at the grille 21 is relatively low, the airflow is relatively uniform, which can reduce noise. At the same time, the horizontal resistance at the grille bar 21 is relatively large, which can effectively suppress the backflow of the target airflow 60 and avoid the phenomenon of short-circuiting of the return air. The suppression effect of short-circuiting of return air is best when w=115°~135°.

[0063] In some embodiments, refer to Figure 11 and Figure 12 The return air grille 20 includes a main flow area 20a and a secondary main flow area 20b. The area where the grille bars 21 are located is the secondary main flow area 20b, and the part of the return air grille 20 excluding the secondary main flow area is the main flow area 20a.

[0064] Specifically, near the middle of the grille bar, i.e. in the main flow area 20a, the free segment of the grille bar 21 is perpendicular to the connecting bar.

[0065] Specifically, in the area 21b near the air outlet, i.e. the secondary mainstream area, there is one grille bar 21, and the free section of the grille bar 21 extends along the air inlet side.

[0066] Projecting onto a plane orthogonal to the length direction of the first grille bar 21, the point on the air outlet 17 closest to the return air grille 20 is defined as point x, and the distance from point x to the center O of the return air grille 20 is L; the point on the grille bar 21 closest to the center O of the return air grille 20 (which is also the point furthest from the air outlet 17) is point y, and the distance from point x to point y is L1, where L1 ≥ 0.28L.

[0067] If the ratio of L1 to L is less than 0.28, then the width of the sub-mainstream area 20b where the grille bar 21 is located, i.e., L1, is relatively narrow, and its effect of suppressing return air short circuit will be greatly weakened.

[0068] In some embodiments, L1 ≤ 0.39L. If the ratio of L1 to L is greater than 0.39, then the width of the secondary mainstream area 20b where the grille bar 21 is located is relatively large, which will lead to a reduction in the width of the mainstream area 20a, i.e. (L-L1), and the air intake volume at the return air grille 20 will decrease.

[0069] In some embodiments, 0.28L ≤ L1 ≤ 0.39L. Within this range, the intake air volume of the embedded air conditioner indoor unit can be guaranteed, the return air short-circuiting phenomenon can be improved, the air supply distance can be increased, and the noise can be reduced.

[0070] This application simulates the airflow at different L1 / L ratios to obtain a linear relationship between the ratio of L1 to L and the airflow. (Refer to...) Figure 13 As can be seen from the figure, the linear graph exhibits an M-shaped distribution.

[0071] When the proportion is less than 0.28 or greater than 0.39, the airflow decreases significantly, reducing the intake airflow of the embedded air conditioner indoor unit. Therefore, when 0.28L≤L1≤0.39L, the airflow of the embedded air conditioner indoor unit is relatively large and fluctuates by only 0.64%, which is the suitable range for intake airflow.

[0072] In some embodiments, 0.36L≤L1≤0.38L, within this range, can ensure that the grille strip 21 suppresses the return air short circuit, and the intake air volume of the embedded air conditioning indoor unit is optimal.

[0073] It is understandable that the above comparison of air intake volume was conducted under the same wind speed conditions.

[0074] In some embodiments, refer to Figure 14 The embedded air conditioner indoor unit includes an electrical box 70, which is used to realize the electrical control functions of the embedded air conditioner indoor unit. The electrical box 70 is generally rectangular in shape. The electrical box 70 is located above the return air grille 20.

[0075] The return air grille 20 is located on the area projected onto the electrical box 70. The grille includes a first grille and a second grille. The first grille is located on the air inlet side of the grille, and the second grille is located on the air outlet side of the grille.

[0076] In some embodiments, reference is made to Figure 15 The electrical box 70 has a guide slope 71, which is located at the lower part of the electrical box 70 and close to the axis of the fan.

[0077] For a recessed air conditioning indoor unit with four-way air outlet, the electrical box 70 can be located above either grille strip 21_1 or grille strip 21_2.

[0078] Wherein, the vertical distance L3 from the top of the guide slope 71 to the bottom surface of the electrical box, the thickness of the electrical box in the height direction is h, and L3 / h is positively correlated with h.

[0079] The guide slope 71 can reduce the obstruction of airflow by the electrical box 70, reduce wind resistance, and increase the air volume of the indoor unit.

[0080] In some embodiments, the guide ramp 71 is parallel to the free segment of the grille bar 21. This application conducts a comparative experiment on the airflow of the indoor unit with and without the guide ramp 71 on the electrical box 70, and obtains... Figure 16 As can be seen from the figure, after the guide slope 71 is set in the electrical box 70, the air volume of the indoor unit is greatly improved.

[0081] In some embodiments, continue to refer to Figure 15 The inclination angle of the guide slope 71 relative to the surface P is f, where f = e.

[0082] The extended surface of the guide slope 71 can divide the space of the intermediate region 183 into a first intermediate region 1831 and a second intermediate region 1832, wherein the first intermediate region 1831 is close to the axis of the fan 40, and the second intermediate region 1832 is far away from the axis of the fan 40.

[0083] The guide slope 71 is equivalent to removing a portion of the space at one corner of the electrical box 70. In this application, the space enclosed by the guide slope 71, the extended surface of the side of the electrical box 70, and the extended surface of the bottom is called the missing corner space 72.

[0084] In some embodiments, refer to Figure 17 The distance from the top of the guide slope 71 to the bottom of the electrical box 70 is L3, and the thickness of the electrical box 70 in the height direction is h. L3 / h is positively correlated with h.

[0085] Since the internal space of the embedded air conditioner indoor unit is limited, if the thickness h of the electrical box 70 is large, then the electrical box 70 will be closer to the third grille strip 23, that is, L2 will be smaller. In this case, the corner space 72 can be set larger to reduce the resistance of the electrical box 70 to airflow and reduce the impact of the electrical box 70 on the air volume.

[0086] Therefore, L3 / h is positively correlated with h, that is, the larger h is, the larger the proportion of L3 relative to h; the smaller h is, the smaller the proportion of L3 relative to h. In this way, wind resistance can be reduced as much as possible and air volume can be increased.

[0087] In some embodiments, L3 / h ≥ 0.1. If the proportion of L3 to h is very small, then the notched space 72 is relatively small, which will weaken the effect of the guide ramp 71 in reducing wind resistance.

[0088] In some embodiments, L3 / h ≤ 0.26. If L3 has a large proportion relative to h, the missing corner space 72 will be relatively large, which will significantly reduce the internal storage space of the electrical box 70, making it difficult to arrange electrical components within the electrical box 70.

[0089] In some embodiments, 0.1 ≤ L3 / h ≤ 0.26. The airflow is maximized while minimizing wind resistance, without affecting the internal arrangement of electrical components in the electrical box 70.

[0090] This application also compares the pressure loss of the electrical box 70 under different thicknesses h, with and without the guide slope 71, and obtains... Figure 18 As can be seen from the figure, after the guide slope 71 is set according to the above proportion, the pressure loss is maintained at about 7.8 Pa regardless of the change in the thickness h of the electrical box 70; if there is no guide slope 71, the pressure loss will increase by 1.2~3.9 Pa.

[0091] In addition, after setting the guide ramp 71 according to the above proportion, the noise is reduced by 0.2~0.7dB.

[0092] As can be seen from the above, according to the embodiment of this application, the grille bar on the return air grille 20 near the air outlet 17 is the grille bar 21. By setting the grille bar 21 to be inclined from bottom to top towards the air outlet 17, the angle between the grille bar 21 and the target airflow 60 flowing from the air outlet 17 to the return air grille 20 can be reduced, the resistance of the target airflow 60 flowing through the return air grille 20 can be increased, thereby suppressing the backflow of the target airflow 60 and thus improving the problem of return air short circuit.

[0093] In addition, compared with the problem of high noise caused by the convergence of the target airflow 60 and the normal airflow at the grille bar 21 in the prior art, the grille bar 21 in this application is set at an angle, which can make the airflow at the grille bar 21 more uniform, thereby reducing the noise at the return air grille 20.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0095] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. An embedded air conditioner indoor unit, characterized in that, include: Indoor unit body; The control panel is located below the indoor unit body; The return air vent, which has an opening in the center of the panel, is used to draw in indoor air; An air outlet is formed by openings on the panel outside the return air inlet; A fan is used to blow the air drawn in from the return air inlet into the air outlet; An air guide plate is provided at the air outlet to open and close the air outlet and guide the exhaust air. A return air grille, which is installed on the panel in a manner that can cover the aforementioned return air vent, the return air grille comprising; Multiple grille strips, including connecting sections and free sections, extend along the length direction of the air outlet; A connecting strip, which connects to the connecting section of the grille strip to form the return air inlet; Among them, near the air outlet, the free section of the grille bar extends obliquely in a direction away from the air outlet.

2. The embedded air conditioner indoor unit according to claim 1, characterized in that, The obtuse angle formed by the free segment of the grille bar tilting away from the air outlet satisfies: 105°≤w≤135°.

3. The embedded air conditioner indoor unit according to claim 1, characterized in that, The obtuse angle formed by the free segment of the grille bar tilting away from the air outlet satisfies: 115°≤w≤135°.

4. The embedded air conditioner indoor unit according to claim 1, characterized in that, Also includes: An electrical box is located above the return air grille; The return air grille is located on the area projected onto the electrical box. The grille includes a first grille and a second grille. The first grille is located on the air inlet side of the grille, and the second grille is located on the air outlet side of the grille.

5. The embedded air conditioner indoor unit according to claim 4, characterized in that, The electrical box has a guide ramp, which is located at the bottom of the electrical box and close to the axis of the fan.

6. The embedded air conditioner indoor unit according to claim 5, characterized in that, The vertical distance L3 from the top of the guide slope to the bottom surface of the electrical box, and the thickness h of the electrical box in the height direction, are positively correlated with L3 / h.

7. The indoor unit of the air conditioner according to claim 6, characterized in that, 0.1≤L3 / h≤0.

26.

8. The embedded air conditioner indoor unit according to claim 5, characterized in that, The guide ramp is parallel to the free section of the grid bar.

9. The embedded air conditioner indoor unit according to claim 1, characterized in that, Near the middle of the grille bar, the free section of the grille bar is perpendicular to the connecting bar.

10. The embedded air conditioner indoor unit according to claim 1, characterized in that, Near the air outlet, there is one grille bar, and the free section of the grille bar extends along the air inlet side.

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