Indoor unit of embedded air conditioner and embedded air conditioner

Abstract

The application provides an indoor unit of an embedded air conditioner and the embedded air conditioner. The indoor unit comprises: an indoor fan, a lower side of the indoor fan is formed with an air inlet, and an outer periphery of the indoor fan is formed with an air outlet; an indoor heat exchanger, the indoor heat exchanger extends along the outer periphery direction of the indoor fan and is arranged opposite to the air outlet, and the indoor heat exchanger is arranged around the indoor fan; a side wall surface of the indoor heat exchanger towards the air outlet forms a heat exchange surface, the heat exchange surface is provided with a wind guide mounting plate, the wind guide mounting plate extends along the width direction of the indoor heat exchanger and is parallel to the central axis of the indoor fan, and at least the part of the wind guide mounting plate connected to the heat exchange surface is perpendicular to the heat exchange surface. The indoor unit and the embedded air conditioner provided by the application can effectively improve the aerodynamic performance between the air outlet of the fan blade and the indoor heat exchanger, reduce the generation of vortex, and reduce the generation of fin noise at the indoor heat exchanger.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and more particularly to an indoor unit of an embedded air conditioner and an embedded air conditioner. Background Technology

[0002] In related technologies, embedded air conditioners, also known as ceiling-mounted or recessed units, are increasingly favored by consumers due to their long air delivery distance, aesthetically pleasing appearance, and small space occupation. The working principle of an embedded air conditioner is as follows: indoor airflow is driven by the rotating backward centrifugal fan blades, undergoes a 90° turn, flows out from the blade outlet, and further flows through the indoor heat exchanger. Subsequently, after passing through the heat exchanger, the airflow is again turned 90° by the air outlet duct and blown out, thus completing the cooling or heating process of the indoor airflow.

[0003] However, existing embedded air conditioners, due to their air outlet method and internal damping components such as heat exchangers and electric auxiliary heating, have complex internal airflow and numerous vortices, which can easily affect the aerodynamic performance and noise of the embedded air conditioner itself. In addition, since the evaporator is installed at the air outlet of the centrifugal fan, it creates significant airflow resistance in the air outlet process of the embedded air conditioner, causing chaotic airflow in the space between the centrifugal fan outlet and the evaporator inlet. This leads to more severe backflow between the centrifugal fan and the guide ring. Furthermore, because the airflow direction at the centrifugal fan outlet is not completely parallel to the airflow direction at the evaporator inlet, the flow field in the flow channel from the centrifugal fan outlet to the evaporator inlet is relatively turbulent, generating many vortices, resulting in significant flow losses and producing considerable vortex noise and fin noise at the fins. Summary of the Invention

[0004] This invention provides an indoor unit for an embedded air conditioner and an embedded air conditioner to overcome the deficiencies in the prior art and achieve the following technical effects: effectively improve the aerodynamic performance between the fan blade outlet and the indoor heat exchanger, reduce eddy current generation, and reduce the noise generated by the fins at the indoor heat exchanger.

[0005] An indoor unit of an embedded air conditioner according to a first aspect embodiment of the present invention includes:

[0006] An indoor fan, wherein an air inlet is formed on the lower side of the indoor fan and an air outlet is formed on the outer periphery of the indoor fan;

[0007] An indoor heat exchanger extends along the outer periphery of the indoor fan and is disposed opposite to the air outlet, and the indoor heat exchanger is disposed around the indoor fan;

[0008] The side wall of the indoor heat exchanger facing the air outlet forms a heat exchange surface. An air guide plate is provided on the heat exchange surface. The air guide plate extends along the width direction of the indoor heat exchanger and is parallel to the central axis of the indoor fan. At least a portion of the air guide plate connected to the heat exchange surface is perpendicular to the heat exchange surface.

[0009] According to one embodiment of the present invention, the air guide mounting plate is perpendicular to the heat exchange surface.

[0010] According to one embodiment of the present invention, the air guide mounting plate includes a guide portion and a guide portion. One end of the guide portion is fixed to the heat exchange surface and the other end is connected to the guide portion. The guide portion is perpendicular to the heat exchange surface, and at least one side wall of the guide portion is inclined or bent relative to the guide portion.

[0011] According to one embodiment of the present invention, one side wall of the drainage portion is inclined or bent relative to the guide portion, and the other side wall is parallel to the guide portion.

[0012] According to one embodiment of the present invention, both side walls of the drainage portion are inclined or bent relative to the guide portion.

[0013] According to one embodiment of the present invention, the inclination angle α of the drainage portion relative to the guide portion ranges from -60° to α to 60°.

[0014] According to one embodiment of the present invention, an electric heating element is provided between the indoor heat exchanger and the air outlet of the indoor fan, and the electric heating element is fixedly connected to the heat exchange surface through the air guide mounting plate.

[0015] According to one embodiment of the present invention, the electric heating element is disposed around the air outlet of the indoor fan, wherein the electric heating element extends along the outer periphery of the indoor fan, or the electric heating element extends along the length of the heat exchange surface;

[0016] There are multiple air guide mounting plates, and each of the multiple air guide mounting plates is used to fix the electric heating element at different positions.

[0017] According to one embodiment of the present invention, an air-gathering plate is further installed on the side wall of the air guide mounting plate. The air-gathering plate is arc-shaped relative to the air guide mounting plate and is bent toward the side away from the air guide mounting plate.

[0018] According to one embodiment of the present invention, the indoor heat exchanger is trapezoidal in cross-section perpendicular to the central axis of the indoor fan, and at least one air guide mounting plate is provided on each inner sidewall of the indoor heat exchanger.

[0019] An embedded air conditioner according to a second aspect of the present invention includes:

[0020] The indoor unit of the embedded air conditioner as described in the first aspect embodiment of the present invention;

[0021] The outdoor unit is connected to the indoor unit.

[0022] This invention provides an indoor unit for an embedded air conditioner, the specific working process of which is as follows: the indoor airflow below the indoor unit rises and enters the air inlet of the indoor fan. Under the work done by the rotation of the indoor fan blades, the indoor airflow makes a 90° turn and flows out from the air outlet on the side of the indoor fan to the indoor heat exchanger to achieve cooling or heating of the indoor airflow. During the process of the airflow flowing to the indoor heat exchanger, the air guide plate can guide and rectify the airflow, so that the airflow can be blown into the indoor heat exchanger in a direction perpendicular to the indoor heat exchanger. At this time, the flow loss of the airflow is minimized, the flow field is stable, and the probability of vortex generation is small, thus the probability of vortex noise is also small. In this way, the aerodynamic performance between the fan blade outlet and the indoor heat exchanger can be effectively improved, the generation of vortices can be reduced, and the generation of fin noise at the indoor heat exchanger can be reduced.

[0023] The indoor unit features an air guide plate mounted on the side wall of the indoor heat exchanger facing the air outlet. Furthermore, at least a portion of the air guide plate connected to the heat exchange surface is perpendicular to the heat exchange surface. This allows the airflow to enter the indoor heat exchanger in a direction perpendicular to it. At this point, the airflow loss is minimized, the flow field is stable, and the probability of vortex generation is low, resulting in a low probability of vortex noise. This effectively improves the aerodynamic performance between the fan outlet and the indoor heat exchanger, reduces vortex generation, and decreases fin noise at the indoor heat exchanger. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the indoor unit of an embedded air conditioner provided in one embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the air guide mounting plate provided in one embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the air guide mounting plate provided in another embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the indoor unit of an embedded air conditioner provided in another embodiment of the present invention;

[0029] Figure 5 This is a structural schematic diagram of the indoor unit of an embedded air conditioner provided in another embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the indoor unit of an embedded air conditioner provided in another embodiment of the present invention;

[0031] Figure 7 This is a statistical comparison chart of the relationship between air volume and noise provided by the present invention.

[0032] Figure label:

[0033] 1. Indoor fan; 11. Air outlet; 2. Indoor heat exchanger; 21. Heat exchange surface; 3. Air guide plate; 31. Mounting part; 32. Air guide part; 33. Air diversion part; 4. Electric heating element. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0035] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "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 the embodiments of the present invention 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 the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0037] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] The following description, with reference to the accompanying drawings, describes an indoor unit and an embedded air conditioner according to the present invention, wherein the embedded air conditioner described in the second aspect of the present invention includes the indoor unit with the embedded hole described in the first aspect of the present invention.

[0039] like Figures 1 to 5 As shown, the indoor unit of an embedded air conditioner according to a first aspect embodiment of the present invention includes an indoor fan 1 and an indoor heat exchanger 2.

[0040] An air inlet is formed on the lower side of the indoor fan 1, and an air outlet 11 is formed on the outer periphery of the indoor fan 1. The indoor heat exchanger 2 extends along the outer periphery of the indoor fan 1 and is arranged opposite to the air outlet 11, and the indoor heat exchanger 2 is arranged around the indoor fan 1.

[0041] The side wall of the indoor heat exchanger 2 facing the air outlet 11 forms a heat exchange surface 21. A guide plate 3 is provided on the heat exchange surface 21. The guide plate 3 extends along the width direction of the indoor heat exchanger 2 and is parallel to the central axis of the indoor fan 1. At least the part of the guide plate 3 connected to the heat exchange surface 21 is perpendicular to the heat exchange surface 21.

[0042] According to an embodiment of the present invention, the indoor unit of the embedded air conditioner operates as follows: the indoor airflow below the indoor unit rises and enters the air inlet of the indoor fan 1. Under the work done by the rotation of the blades of the indoor fan 1, the indoor airflow turns 90° and flows out from the air outlet 11 on the side of the indoor fan 1 to the indoor heat exchanger 2 to achieve cooling or heating of the indoor airflow. During the process of the airflow flowing to the indoor heat exchanger 2, the air guide plate 3 can guide and rectify the airflow, so that the airflow can be blown into the indoor heat exchanger 2 in a direction perpendicular to the indoor heat exchanger 2. At this time, the flow loss of the airflow is minimized, the flow field is stable, and the probability of vortex generation is small, thus the probability of vortex noise is also small. In this way, the aerodynamic performance between the fan outlet 11 and the indoor heat exchanger 2 can be effectively improved, the generation of vortices can be reduced, and the generation of fin noise at the indoor heat exchanger 2 can be reduced.

[0043] In related technologies, embedded air conditioners, also known as ceiling-mounted or recessed units, are increasingly favored by consumers due to their long air delivery distance, aesthetically pleasing appearance, and small space occupation. The working principle of an embedded air conditioner is as follows: indoor airflow is driven by the rotating backward centrifugal fan blades, undergoes a 90° turn, flows out from the blade outlet, and further flows through the indoor heat exchanger. Subsequently, after passing through the heat exchanger, the airflow is again turned 90° by the air outlet duct and blown out, thus completing the cooling or heating process of the indoor airflow.

[0044] However, existing embedded air conditioners, due to their air outlet method and internal damping components such as heat exchangers and electric auxiliary heating, have complex internal airflow and numerous vortices, which can easily affect the aerodynamic performance and noise of the embedded air conditioner itself. In addition, since the evaporator is installed at the air outlet of the centrifugal fan, it creates significant airflow resistance in the air outlet process of the embedded air conditioner, causing chaotic airflow in the space between the centrifugal fan outlet and the evaporator inlet. This leads to more severe backflow between the centrifugal fan and the guide ring. Furthermore, because the airflow direction at the centrifugal fan outlet is not completely parallel to the airflow direction at the evaporator inlet, the flow field in the flow channel from the centrifugal fan outlet to the evaporator inlet is relatively turbulent, generating many vortices, resulting in significant flow losses and producing considerable vortex noise and fin noise at the fins.

[0045] In summary, to address the technical deficiencies in the aforementioned related technologies, this invention provides an indoor unit for an embedded air conditioner. This indoor unit features an air guide plate 3 mounted on the side wall of the indoor heat exchanger 2 facing the air outlet 11. Furthermore, the portion of the air guide plate 3 connected to the heat exchange surface 21 is perpendicular to the heat exchange surface 21. This allows the airflow to be blown into the indoor heat exchanger 2 in a direction perpendicular to the indoor heat exchanger 2. At this point, the flow loss of the airflow is minimized, the flow field is stable, and the probability of vortex generation is low, resulting in a low probability of vortex noise. This effectively improves the aerodynamic performance between the fan outlet 11 and the indoor heat exchanger 2, reduces vortex generation, and reduces fin noise at the indoor heat exchanger 2.

[0046] The aerodynamic working principle of the air guide mounting plate 3 can be understood as follows:

[0047] like Figure 1 As shown, taking a fluid particle on the blade of the indoor fan 1 as an example, w is the circumferential velocity of the air outlet 11 of the indoor fan 1. The motion of the fluid particle relative to the indoor fan 1 is called relative motion, and its velocity is called relative velocity u. The motion of the fluid particle relative to the stationary shell of the indoor fan 1 is called absolute motion. Absolute motion is a composite motion of circumferential motion and relative motion. Therefore, the absolute velocity v is equal to the vector sum between the circumferential velocity w and the relative velocity u, that is: v = u + w.

[0048] The angle between the absolute velocity v and the circumferential velocity w is denoted by β, and the angle between the relative velocity u and the circumferential velocity w in opposite directions is denoted by α. α can also be understood as the installation angle of the fan blades. The absolute velocity v, the circumferential velocity w, and the relative velocity u together form a velocity triangle. Since this invention mainly studies the angular parameter changes of the fluid from the air outlet 11 of the indoor fan 1 to the indoor heat exchanger 2, it is sufficient to study the velocity triangle of the air outlet 11 of the indoor fan 1. Figure 1 It can be seen that under ideal conditions, β=90°, at which point the absolute velocity v can be perpendicular to the indoor heat exchanger 2, that is, the outlet airflow flows through the indoor heat exchanger 2 in a direction parallel to the fins of the indoor heat exchanger 2. At this point, the flow loss of the outlet airflow is the lowest, the flow field is stable, the probability of vortex generation is small, and the probability of generating vortex noise is also small.

[0049] In this way, by making the angle β between the absolute velocity v and the circumferential velocity w 90°, that is, the direction of the airflow into the indoor heat exchanger 2 is perpendicular to the indoor heat exchanger 2, the flow loss of the airflow can be greatly reduced, and the probability of vortex generation can be reduced, thereby reducing the generation of vortex noise.

[0050] According to some embodiments of the present invention, the structural shape of the air guide mounting plate 3 can be set differently depending on the usage scenario. Specifically, the air guide mounting plate 3 can be completely perpendicular to the heat exchange surface 21 of the indoor heat exchanger 2, or the air guide mounting plate 3 can be partially perpendicular to the heat exchange surface 21 of the indoor heat exchanger 2. The present invention does not impose any special limitations here. Some preferred embodiments will be described in detail below.

[0051] like Figure 2 As shown, in a specific embodiment of the present invention, the air guide plate 3 is perpendicular to the heat exchange surface 21.

[0052] At this time, the air guide mounting plate 3 is inserted and fixed in the indoor heat exchanger 2 through the mounting part 31. The mounting part 31 can be chamfered, and the chamfer e of the mounting part 31 is in the range of 170° to 180°. The length of the air guide mounting plate 3 excluding the mounting part 31 is c. The value of c is related to the distance between the indoor fan 1 and the indoor heat exchanger 2 and the angle of the mounting fins of the indoor heat exchanger 2. Specifically, 0 < c < D2 - D1, where D1 is the radius of the indoor fan 1 and D2 is the vertical distance from the center of the indoor fan 1 to the indoor heat exchanger 2.

[0053] Furthermore, the length d of the mounting part 31 is related to the overall width L1 of the indoor heat exchanger 2. Specifically, L1 / 3≤d≤L1 / 2. This ensures that the mounting part 31 is installed securely while preventing the mounting part 31 from exceeding the overall width of the indoor heat exchanger 2.

[0054] like Figure 3 As shown, in another specific embodiment of the present invention, the air guide mounting plate 3 includes a guide portion 32 and a guide portion 33. One end of the guide portion 32 is fixed to the heat exchange surface 21 and the other end is connected to the guide portion 33. The guide portion 32 is perpendicular to the heat exchange surface 21. At least one side wall of the guide portion 33 is inclined or bent relative to the guide portion 32.

[0055] The air guide plate 3 also includes an installation part 31, and the air guide part 32 is inserted into and fixed on the indoor heat exchanger 2 through the installation part 31.

[0056] It is understandable that, during the actual use of the indoor unit, the direction of the airflow is not always directional. That is, there will always be some deviations in the direction of the airflow flowing out of the air outlet 11. Therefore, the air guide plate 3, which is completely perpendicular to the indoor heat exchanger 2, often cannot achieve the best airflow guiding effect when facing the airflow with the above-mentioned directional deviation. In other words, it cannot guarantee that all the airflow flows into the indoor heat exchanger 2 in a direction perpendicular to the indoor heat exchanger 2. Therefore, it is necessary to further improve the structure of the air guide plate 3 so as to interfere with the unstable area with a large deviation angle (that is, the area formed by the unstable airflow) when the airflow flows to the indoor heat exchanger 2.

[0057] In summary, to ensure that the air guide plate 3 can also achieve the same airflow guiding effect in unstable areas with large deviation angles, and to guarantee a better airflow guiding effect for the air guide plate 3, this embodiment designs the free end of the air guide plate 3 as a flow guide 33 with at least one side wall inclined or bent. In this way, the flow guide 33 is used to guide and concentrate the airflow from the air outlet 11. That is, by using the inclined or bent wall of the flow guide 33, it can interfere with unstable areas with large deviation angles (i.e., areas formed by unstable airflow), and fine-tune the direction of the airflow with large deviations. This allows the airflow to be gathered to the flow guide 33 and guided along the flow guide 33 to the subsequent flow guide 32. Then, the flow guide 32 guides the airflow to be perpendicular to the heat exchange surface 21 of the indoor heat exchanger 2, so that the air guide plate 3 has the optimal airflow guiding effect.

[0058] For example, one side wall of the drainage section 33 is inclined or bent relative to the guide section 32, and the other side wall is parallel to the guide section 32.

[0059] For example Figure 3 As shown, both sides of the drainage section 33 are inclined or bent relative to the guide section 32. In this case, the entire drainage section 33 is inclined or bent relative to the guide section 32.

[0060] Furthermore, in this embodiment, when the entire flow-guiding part 33 is inclined or bent relative to the flow-directing part 32, the length of the flow-directing part 32 can be zero. In this case, the flow-directing mounting plate only includes the flow-guiding part 33 and the mounting part 31. However, it should be noted that one end of the flow-guiding part 33 adjacent to the heat exchange surface 21 is also perpendicular to the heat exchange surface 21, thereby ensuring that the airflow flows through the heat exchange surface 21 of the indoor heat exchanger 2 in a vertical direction. At this time, the overall length of the flow-guiding part 33 in the direction perpendicular to the heat exchange surface 21 is c. The value of c is related to the distance between the indoor fan 1 and the indoor heat exchanger 2 and the angle of the mounting fins of the indoor heat exchanger 2. Specifically, 0 < c < D2 - D1, where D1 is the radius of the indoor fan 1 and D2 is the vertical distance from the center of the indoor fan 1 to the indoor heat exchanger 2.

[0061] Of course, the length of the guide section 32 can also be non-zero. In this case, the overall length of the guide section 32 and the flow guide section 33 in the direction perpendicular to the heat exchange surface 21 is c. The value of c is related to the distance between the indoor fan 1 and the indoor heat exchanger 2 and the angle of the mounting fins of the indoor heat exchanger 2. Specifically, 0 < c < D2 - D1, where D1 is the radius of the indoor fan 1 and D2 is the vertical distance from the center of the indoor fan 1 to the indoor heat exchanger 2.

[0062] It should be noted that the above embodiments are only some of the many embodiments of the present invention and do not constitute a specific limitation on the length of the guide portion 32 of the present invention.

[0063] like Figure 3 As shown, further, the range of the tilt angle α of the drainage section 33 relative to the guide section 32 is -60° < α < 60°. Here, -60° indicates that its tilt direction is not limited to one side, that is, the tilt direction of the drainage section 33 is within a range of 60° to the left and right.

[0064] Of course, the above embodiments are only preferred embodiments among the many embodiments of the present invention, and do not constitute a specific limitation on the tilt angle a of the present invention.

[0065] like Figure 6 As shown, the air guide plate 3 can also be fixed to the heat exchange surface 21 by means of a mounting bracket and a threaded connection.

[0066] like Figure 4 and Figure 5 As shown, according to some embodiments of the present invention, an electric heating element 4 is provided between the indoor heat exchanger 2 and the air outlet 11 of the indoor fan 1. The electric heating element 4 is fixed between the indoor heat exchanger 2 and the air outlet 11 of the indoor fan 1 by means of an air guide mounting plate 3.

[0067] In this way, the installation structure between the electric heating element 4 and the indoor heat exchanger 2 is combined with the air guide mounting plate 3, so that the air guide mounting plate 3 can simultaneously perform air guiding and installation functions without occupying the existing space. This simplifies the indoor unit structure, saves costs, and improves the functional integration and structural modularity of the air conditioner.

[0068] It is understandable that air conditioners generally depend on the power of the compressor for both cooling and heating, and the basic principle is the same. However, it is affected by the outdoor temperature. In winter, the efficiency of heating by the compressor alone is low, and it is difficult to achieve the ideal effect. At this time, auxiliary electric heating is required, which is a heating rod or bent tube / semiconductor heating ceramic added to the indoor unit to assist in heating and achieve the ideal effect. In this embodiment, the electric heating structure is improved on the original basis. The installation structure between the electric heating element 4 and the indoor heat exchanger 2 is combined with the air guide installation plate 3, thereby adding the air guide function without increasing the existing space.

[0069] like Figure 4 and Figure 5 As shown, according to some embodiments of the present invention, the electric heating element 4 is arranged around the air outlet 11 of the indoor fan 1, and there are multiple air guide mounting plates 3, which are used to fix the electric heating element 4 at different positions.

[0070] In this way, by setting multiple air guide mounting plates 3, not only can the airflow around the air outlet 11 be guided through the air guide mounting plates 3, but the installation stability of the electric heating element 4 can also be improved, ensuring that the overall structure is more stable and reliable, and avoiding mechanical failures caused by unstable connections.

[0071] like Figure 4 and Figure 5 As shown, for example, there are four air guide mounting plates 3, which are respectively arranged symmetrically relative to the four ends of the indoor fan 1. Of course, the number of air guide mounting plates 3 can also be other, and the present invention does not impose any special restrictions on this.

[0072] Furthermore, the electric heating element 4 is an electric heating tube, and the air guide mounting plate 3 is provided with mounting holes. The electric heating tube passes through the mounting holes and is fixed on the air guide mounting plate 3, thereby realizing the fixed installation of the electric heating tube.

[0073] The electric heating tube can be a spiral structure. In this case, there are two or more mounting holes. All the mounting holes on the same air guide mounting plate 3 are evenly arranged along its length to correspond to each turn of the electric heating tube.

[0074] In some specific embodiments of the present invention, the electric heating element extends along the outer periphery of the indoor fan 1. That is, the electric heating element has an overall annular structure.

[0075] In some other embodiments of the invention, the electric heating tube extends along the length of the heat exchange surface 21. That is, in a cross-section perpendicular to the central axis of the indoor fan 1, the shape of the electric heating tube is the same as the shape of the indoor heat exchanger 2, and the electric heating tube is enclosed inside the indoor heat exchanger 2.

[0076] Furthermore, the cross-sectional shape of the electric heating element can be circular, triangular, etc., and the present invention does not impose any special limitations on it.

[0077] like Figure 4 As shown, in one embodiment, the electric heating element 4 is an annular spiral electric heating tube, and the air guide mounting plate 3 is arranged perpendicular to the heat exchange surface 21 of the indoor heat exchanger 2. The electric heating element 4 is fixed between the indoor heat exchanger 2 and the indoor fan 1 by the air guide mounting plate 3.

[0078] like Figure 5 As shown, in another embodiment, the electric heating element 4 is an annular spiral electric heating tube, and the air guide mounting plate 3 includes a guide portion 32 and a guide portion 33. The guide portion 32 is perpendicular to the heat exchange surface 21, and the guide portion 33 is bent relative to the guide portion 32. The electric heating element 4 is fixed between the indoor heat exchanger 2 and the indoor fan 1 by the air guide mounting plate 3.

[0079] like Figure 4 and Figure 5 As shown, according to some embodiments of the present invention, the indoor heat exchanger 2 is trapezoidal in cross-section perpendicular to the central axis of the indoor fan 1, and at least one air guide plate 3 is provided on each inner sidewall of the indoor heat exchanger 2.

[0080] This allows for a higher degree of shape compatibility between the indoor heat exchanger 2 and the air outlet 11 of the indoor fan 1, making it easier for the air guide plate 3 to guide the airflow into the indoor heat exchanger 2.

[0081] Of course, the shape and structure of the indoor heat exchanger 2 are not limited to this. The present invention can also set the indoor heat exchanger 2 to other different shapes and structures according to the actual situation. The present invention does not impose any special restrictions here.

[0082] like Figures 1 to 5 As shown, the embedded air conditioner according to a second aspect embodiment of the present invention includes an indoor unit of the embedded air conditioner described in the first aspect embodiment of the present invention, and also includes an outdoor unit connected to the indoor unit.

[0083] The specific working process and working principle of the embedded air conditioner according to the embodiments of the present invention have been described in detail above, and will not be repeated here.

[0084] In summary, according to the embedded air conditioner of the present invention, by providing an air guide mounting plate 3 on the side wall of the indoor heat exchanger 2 facing the air outlet 11, and further making at least the portion of the air guide mounting plate 3 connected to the heat exchange surface 21 perpendicular to the heat exchange surface 21, the resulting airflow can be blown into the indoor heat exchanger 2 in a direction perpendicular to the indoor heat exchanger 2. At this time, the flow loss of the air outlet is minimized, the flow field is stable, and the probability of vortex generation is small, thus the probability of vortex noise is also small. In this way, the aerodynamic performance between the fan outlet 11 and the indoor heat exchanger 2 can be effectively improved, the generation of vortices can be reduced, and the generation of fin noise at the indoor heat exchanger 2 can be reduced.

[0085] Furthermore, the inventors conducted multiple experimental measurements on the relationship between airflow and noise in the indoor unit under two conditions: with and without a flow-guiding structure (i.e., air-guiding mounting plate 3). Figure 7 The graph showing the relationship between airflow volume and noise indicates that, compared to indoor units without an airflow guide structure, the indoor unit of this invention with the airflow guide structure (i.e., the airflow guide mounting plate 3) typically reduces noise by at least 1-3 dB under the same airflow conditions. This demonstrates the superiority of the air conditioner of this invention over air conditioners in the related art.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An indoor unit of an embedded air conditioner, characterized by comprising: The indoor fan has an air inlet formed on the lower side thereof and an air outlet formed on the outer periphery thereof. The indoor heat exchanger extends along the outer periphery direction of the indoor fan and is arranged opposite to the air outlet. A side wall of the indoor heat exchanger facing the air outlet forms a heat exchange surface, and a guide air installation plate is arranged on the heat exchange surface. The guide air installation plate extends along the width direction of the indoor heat exchanger and is parallel to the central axis of the indoor fan. At least the part of the guide air installation plate connected to the heat exchange surface is perpendicular to the heat exchange surface.

2. The indoor unit of the recessed air conditioner according to claim 1, characterized by, The guide air installation plate includes a guide flow part and a flow guide part.

3. The indoor unit of the recessed air conditioner according to claim 1, characterized by, The guide flow part is fixed to the heat exchange surface at one end and connected to the flow guide part at the other end.

4. The indoor unit of the recess type air conditioner according to claim 1, characterized in that, The length of the guide flow part is not zero.

5. The indoor unit of the recessed air conditioner according to claim 4, characterized in that, The guide air installation plate is perpendicular to the heat exchange surface as a whole.

6. The indoor unit of the recessed air conditioner according to any one of claims 1 to 5, characterized by, One side wall of the flow guide part is inclined or curved relative to the guide flow part.

7. The indoor unit of the recessed air conditioner according to claim 6, characterized by, Both side walls of the flow guide part are inclined or curved relative to the guide flow part. The inclination angle a of the flow guide part relative to the guide flow part ranges from -60° to 60°.

8. The indoor unit of the recessed air conditioner according to any one of claims 1 to 5, characterized by, An electric heating element is arranged between the indoor heat exchanger and the air outlet of the indoor fan.

9. An embedded air conditioner, characterized by, The electric heating element is fixedly installed between the indoor heat exchanger and the air outlet of the indoor fan through the guide air installation plate. The electric heating element surrounds the air outlet of the indoor fan. The electric heating element extends along the outer periphery direction of the indoor fan or along the length direction of the heat exchange surface. The number of the guide air installation plates is plural. Each of the guide air installation plates is used to fix the electric heating element at different positions. The indoor heat exchanger is trapezoidal in the cross section perpendicular to the central axis of the indoor fan. The indoor heat exchanger includes: The indoor unit of the embedded air conditioner as claimed in any one of the preceding claims 1 to 8. The outdoor unit connected to the indoor unit.

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