Indoor unit and heating, ventilation and air conditioning system having same

Abstract

Disclosed in the present application are an indoor unit and a heating, ventilation and air conditioning system having same. The indoor unit comprises a housing which is provided with an air duct, an air outlet and an air inlet, the air duct being in communication with the air outlet and the air inlet, and in a length direction of the housing, a mounting groove is provided on at least one side wall of the air duct; and a cross-flow fan arranged in the air duct and comprising an impeller and an end cover, wherein the end of the impeller that faces the mounting groove is connected to the end cover, part of the end cover and part of the impeller are located in the mounting groove, and the length of the impeller extending into the mounting groove is defined as L1, where 2 mm≤L1≤4 mm.

Description

Indoor unit and HVAC system having the same

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on March 25, 2024, with application number 202410345231X and application name “Indoor unit and HVAC system having the same”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of air conditioning, and in particular to an indoor unit and a heating and ventilation system having the same. Background Art

[0003] As one of the commonly used air conditioning equipment, the HVAC system is used to adjust the indoor ambient temperature (some HVAC systems also have functions such as humidity adjustment and purification). In related technologies, HVAC systems have surge problems, resulting in high noise. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide an indoor unit that can suppress surge at the end of a crossflow impeller and has the advantage of low noise.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect embodiment of the present application, an indoor unit is proposed, including: a casing, provided with an air duct, an air outlet and an air inlet, the air duct is connected to the air outlet and the air inlet, and at least one side wall of the air duct is provided with a mounting groove in the length direction of the casing; a cross-flow fan, arranged in the air duct and including an impeller and an end cover, one end of the impeller facing the mounting groove is connected to the end cover, the end cover and a part of the impeller are located in the mounting groove, and in the axial direction of the cross-flow fan, the dimension of the impeller extending into the mounting groove is L1, 2mm≤L1≤4mm.

[0006] In some embodiments of the present application, in the axial direction of the crossflow impeller, a distance between the bottom wall of the mounting groove and the end cover is L2, and L2 is ≥ 5 mm.

[0007] In some embodiments of the present application, in the radial direction of the crossflow impeller, the distance between the side wall of the mounting groove and the end cover is L3, the diameter of the end cover is L4, and 0.03≤L3 / L4≤0.05.

[0008] In some embodiments of the present application, mounting grooves are provided on both opposite side walls of the air duct in the length direction of the casing; there are multiple cross-flow wind wheels, and the multiple cross-flow wind wheels are arranged at intervals along the length direction of the casing, and a part of the cross-flow wind wheel closest to the mounting groove is located in the mounting groove.

[0009] In some embodiments of the present application, the indoor unit further includes: a motor, the casing is provided with an installation cavity, the installation cavity and the air duct are arranged along the length direction of the casing, the motor is located in the installation cavity, and the motor shaft of the motor is transmission-connected to the cross-flow wind wheel; a mounting shell, connected to the casing and covering the installation cavity, the groove wall of the mounting groove is provided with a notch, and the mounting shell is provided with a shielding portion, the shielding portion is located in the notch and shields the cross-flow wind wheel.

[0010] In some embodiments of the present application, in the axial direction of the crossflow impeller, the dimension of the shielding portion shielding the impeller is the same as the dimension of the impeller extending into the installation slot.

[0011] In some embodiments of the present application, the notch includes a bottom wall notch and a side wall notch, the bottom wall notch and the side wall notch are connected, the bottom wall notch is formed on the bottom wall of the mounting groove, and the side wall notch is formed on the side wall of the mounting groove; the shielding portion includes a first shielding segment and a second shielding segment, the first shielding segment and the second shielding segment are connected, the first shielding segment is located in the bottom wall notch, and the second shielding segment is located in the side wall notch; wherein, a side surface of the first shielding segment facing the end cover is flush with a side surface of the bottom wall of the mounting groove facing the end cover.

[0012] In some embodiments of the present application, the distance between the inner side wall of the second blocking section and the outer peripheral surface of the end cover is the same as the distance between the inner side wall of the mounting groove and the outer peripheral surface of the end cover.

[0013] In some embodiments of the present application, one of the second blocking section and the side wall of the mounting groove is provided with a positioning protrusion and the other is provided with a positioning groove, and the positioning protrusion cooperates with the positioning groove.

[0014] According to the second aspect embodiment of the present application, a HVAC system is proposed, including the indoor unit according to the first aspect embodiment of the present application.

[0015] According to the indoor unit of the embodiment of the present invention, by limiting the size of the impeller of the crossflow fan extending into the installation slot, and limiting the size to between 2mm and 4mm, the end surge of the crossflow fan can be suppressed and the noise can be reduced.

[0016] According to the HVAC system of the embodiment of the present invention, by providing the above-mentioned indoor unit, it is possible to suppress surge at the end of the crossflow impeller, and has the advantage of low noise.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] FIG1 is a schematic structural diagram of an indoor unit according to an embodiment of the present application;

[0020] FIG2 is a schematic diagram showing the connection between the base, the crossflow impeller, and the mounting housing of the indoor unit according to an embodiment of the present application;

[0021] FIG3 is a partial enlarged schematic diagram of area A in FIG2 ;

[0022] FIG4 is a schematic diagram showing the connection between the base, the crossflow impeller, and the motor of the indoor unit according to an embodiment of the present application;

[0023] FIG5 is a partial enlarged schematic diagram of area B in FIG4 ;

[0024] FIG6 is a schematic diagram showing the connection between the base and the mounting shell of the indoor unit according to an embodiment of the present application;

[0025] FIG7 is a schematic diagram of a base structure of an indoor unit according to an embodiment of the present application;

[0026] FIG8 is a second schematic diagram of the base structure of the indoor unit according to an embodiment of the present application.

[0027] Figure numerals: Indoor unit 1; casing 100; base 101; air duct 110; mounting groove 111; positioning protrusion 112; notch 113; bottom wall notch 1131; side wall notch 1132; air outlet 120; air inlet 130; mounting cavity 140; crossflow impeller 200; impeller 210; end cover 220; motor 300; mounting shell 310; shielding portion 311; first shielding section 3111; second shielding section 3112; positioning groove 312; heat exchanger 400. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present application are described in detail below.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In the description of this application, “plurality” means two or more.

[0031] In the related art, air conditioner indoor units usually use crossflow impellers for air supply, which have the advantages of smooth air flow and low noise. However, the ends of the crossflow impellers are prone to surge problems, resulting in high noise in the indoor unit.

[0032] After in-depth research, the applicant found that by reasonably setting the installation dimensions of the end of the crossflow impeller and the installation slot, the problem of surge easily occurring at the end of the crossflow impeller can be effectively improved, thereby reducing noise.

[0033] The above is the core concept of the present application. Below, an indoor unit 1 according to an embodiment of the present application is described in conjunction with the accompanying drawings. The indoor unit 1 can be used in a HVAC system, for example, by applying the indoor unit 1 to an air conditioner or a heat pump. Optionally, the indoor unit 1 in the embodiment of the present application can be a split wall-mounted indoor unit, a split floor-standing indoor unit, or a ducted indoor unit.

[0034] As shown in FIG. 1 , FIG. 2 , FIG. 4 and FIG. 5 , the indoor unit 1 according to the embodiment of the present application includes a casing 100 and a cross-flow impeller 200 .

[0035] The casing 100 is provided with an air duct 110, an air outlet 120 and an air inlet 130. The air duct 110 is connected to the air outlet 120 and the air inlet 130. In the length direction of the casing 100, at least one side wall of the air duct 110 is provided with a mounting groove 111, wherein the casing 100 includes a base 101, and the mounting groove 111 is constructed on the base 101. The crossflow impeller 200 is arranged in the air duct 110. A heat exchanger 400 can also be provided in the air duct 110. The heat exchanger 400 is located between the air inlet 130 and the air outlet 120. The heat exchanger 400 can be located between the crossflow impeller 200 and the air inlet 130. When the HVAC system is working, the crossflow impeller 200 rotates, the air flow enters the air duct 110 through the air inlet 130 and exchanges heat with the heat exchanger 400. The air flow after heat exchange flows to the air outlet 120 and is blown out into the room through the air outlet 120, thereby adjusting the indoor ambient temperature.

[0036] In addition, the cross-flow wind wheel 200 includes an impeller 210 and an end cover 220. The end of the impeller 210 facing the mounting groove 111 is connected to the end cover 220. The end cover 220 and a portion of the impeller 210 are located in the mounting groove 111. In the axial direction of the cross-flow wind wheel 200, the dimension of the impeller 210 extending into the mounting groove 111 is L1, 2mm≤L1≤4mm, for example, L1 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm or 4mm.

[0037] The indoor unit 1 in the embodiment of the present application is provided with a mounting groove 111 , and the side wall of the mounting groove 111 surrounds the outer circumference of the cross-flow impeller 3 , thereby reducing backflow of the airflow and increasing the air output.

[0038] Furthermore, when the dimension L1 of the impeller 210 extending into the mounting groove 111 is less than 2 mm, the airflow at the end of the crossflow impeller 200 is excessively absorbed by the impeller 210, resulting in insufficient airflow flowing through the gap between the end cover 220 and the bottom wall of the mounting groove 111. The airflow between the end cover 220 and the bottom wall of the mounting groove 111 is greatly affected by the impeller 210, resulting in unstable flow rate and flow velocity of the airflow flowing through the gap between the end cover 220 and the bottom wall of the mounting groove 111, which is prone to fluctuation, surge, and noise.

[0039] When the dimension L1 of the impeller 210 extending into the mounting groove 111 is greater than 4 mm, the airflow at the end of the crossflow impeller 200 takes a longer path between the impeller 210 and the sidewall of the mounting groove 111, which can easily lead to poor airflow at the end of the crossflow impeller 200 and unstable flow rate or velocity of the airflow at the end of the crossflow impeller 200, resulting in surge and noise.

[0040] When 2mm≤L1≤4mm, it can not only prevent the airflow at the end of the cross-flow wind wheel 200 from being absorbed too much by the impeller 210, but also shorten the path of the airflow at the end of the cross-flow wind wheel 200 flowing through the impeller 210 and the side wall of the mounting groove 111, thereby ensuring the stability of the flow rate and flow velocity of the airflow at the end of the cross-flow wind wheel 200, reducing the probability of surge, and thus reducing noise.

[0041] In some embodiments of the present application, as shown in Figures 4 and 5, the distance between the bottom wall of the mounting groove 111 and the end cap 220 is L2, and L2 ≥ 5 mm. Specifically, the distance L2 between the bottom wall of the mounting groove 111 and the end cap 220 can be 5 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, 6 mm, 6.1 mm, 6.2 mm, 6.3 mm, 6.4 mm, 6.5 mm, 6.6 mm, 6.7 mm, 6.8 mm, 6.9 mm, or 7 mm.

[0042] When the distance between the bottom wall of the mounting groove 111 and the end cover 220 is less than 5 mm, on the one hand, the probability of the cross-flow impeller 200 scraping against the bottom wall of the mounting groove 111 during rotation is relatively high, and the safety hazard of the HVAC system is high. On the other hand, when the airflow flows out of the narrow gap, the flow velocity is relatively fast, which easily leads to increased noise. In addition, the gas flow rate and flow velocity between the bottom wall of the mounting groove 111 and the end cover 220 are unstable, which easily leads to surge and high noise.

[0043] Therefore, the present application sets the distance between the bottom wall of the mounting groove 111 and the end cover 220 to be no less than 5 mm, so that sufficient space is left between the cross-flow impeller 200 and the bottom wall of the mounting groove 111. This can, on the one hand, prevent the cross-flow impeller 200 from scraping against the bottom wall of the mounting groove 111 during rotation, and on the other hand, the flow rate of the airflow between the bottom wall of the mounting groove 111 and the end cover 220 is low, thereby reducing noise. In addition, the gas flow rate and flow rate between the bottom wall of the mounting groove 111 and the end cover 220 are stable, and surge is not likely to occur, thereby further reducing noise, and the noise of the indoor HVAC system can also be reduced.

[0044] In some embodiments of the present application, as shown in Figures 4 and 5, the distance between the bottom wall of the mounting groove 111 and the end cover 220 is L3, the outer diameter of the end cover 220 is L4, 0.03≤L3 / L4≤0.05, for example, L3 / L4 can be 0.03, 0.031, 0.032, 0.033, 0.034, 0.035, 0.036, 0.037, 0.038, 0.039, 0.04, 0.041, 0.042, 0.043, 0.044, 0.045, 0.046, 0.047, 0.038, 0.049 and 0.05.

[0045] When L3 / L4 is less than 0.03, the gap between the outer circumference of the crossflow impeller 200 and the inner circumference of the mounting groove 111 is too small, and the crossflow impeller 200 is likely to interfere with the bottom wall of the mounting groove 111 during rotation, and the probability of damage to the crossflow impeller 200 is relatively high; when L3 / L4 is greater than 0.05, the gap between the outer circumference of the crossflow impeller 200 and the inner circumference of the mounting groove 111 is too large, and the probability of backflow increases, which is likely to cause surge and increase noise.

[0046] When L3 / L4≤0.05, on the one hand, it can prevent the gap between the outer circumference of the cross-flow wind wheel 200 and the inner circumference of the mounting groove 111 from being too small, thereby reducing the probability of the cross-flow wind wheel 200 interfering with the bottom wall of the mounting groove 111 during rotation, thereby ensuring the service life of the cross-flow wind wheel 200; on the other hand, it can prevent the gap between the outer circumference of the cross-flow wind wheel 200 and the inner circumference of the mounting groove 111 from being too large, thereby reducing the probability of backflow, thereby reducing the probability of surge and reducing noise.

[0047] In some embodiments of the present application, as shown in Figures 6-8 , mounting slots 111 are provided on opposite side walls of the air duct 110 along the length of the housing 100. Multiple crossflow rotors 200 are provided, spaced apart along the length of the housing 100, with the end of the crossflow rotor 200 closest to the mounting slot 111 positioned within the mounting slot 111. This reduces the length of a single crossflow rotor 200 and reduces the likelihood of damage to the single crossflow rotor 200.

[0048] For example, in the length direction of the casing 100, the two opposite side walls of the air duct 110 may be a first side wall and a second side wall, and the number of the cross-flow wind wheel 200 may be two, three, four or more. The end of the cross-flow wind wheel 200 closest to the first side wall, close to the first side wall, is inserted into the mounting groove 111 of the first side wall, and the end of the cross-flow wind wheel 200 closest to the second side wall, close to the second side wall, is inserted into the mounting groove 111 of the second side wall.

[0049] In addition, a dual-axis motor (not shown in the figure) can be provided between two adjacent cross-flow wind wheels 200, and the motor shafts of the dual-axis motor at both ends of its axial direction are respectively connected to the two cross-flow wind wheels 200, so that the two adjacent cross-flow wind wheels 200 rotate synchronously; or a coupling can be provided between the two adjacent cross-flow wind wheels 200, and the two cross-flow wind wheels 200 are connected through the coupling to make the two adjacent cross-flow wind wheels 200 rotate synchronously.

[0050] By inserting both ends of the multiple cross-flow blower wheels 200 into the mounting groove 111, the gas flow rate and gas flow rate at both ends of the multiple cross-flow blower wheels 200 are relatively stable, that is, surge is not likely to occur at both ends, thereby reducing the overall noise of the multiple cross-flow blower wheels 200 and effectively achieving the purpose of reducing the noise of the indoor unit 1.

[0051] In some embodiments of the present application, as shown in FIG. 2 and FIG. 5 - FIG. 7 , the indoor unit 1 further includes a motor 300 and a mounting shell 310 .

[0052] The housing 100 has a mounting cavity 140. The mounting cavity 140 and the air duct 110 are arranged along the length of the housing 100. The motor 300 is located in the mounting cavity 140, and the motor shaft of the motor 300 is drivingly connected to the crossflow impeller 200. A mounting housing 310 is connected to the housing 100 and covers the mounting cavity 140. The wall of the mounting slot 111 has a notch 113. The mounting housing 310 has a shielding portion 311, which is located in the notch 113 and shields the crossflow impeller 200.

[0053] It should be noted that the groove wall of the installation groove 111 includes the side wall and the bottom wall of the installation groove 111 .

[0054] For example, when there is one cross-flow wind wheel, one end of the cross-flow wind wheel 200 is connected to the motor shaft of the motor 300; when there are multiple cross-flow wind wheels 200, two adjacent cross-flow wind wheels 200 can be connected by a coupling, and the cross-flow wind wheel 200 closest to the motor 300 is connected to the motor shaft, and the motor 300 drives the multiple cross-flow wind wheels 200 to rotate as a whole through the motor shaft.

[0055] The motor 300 can be used to drive the crossflow impeller 200 to rotate, thereby directing airflow through the air inlet 130, the air duct 110, and the air outlet 120. The mounting housing 310 can be provided to confine the motor 300 within the mounting cavity 140, preventing the motor 300 from shaking relative to the housing 100. Furthermore, the mounting housing 310 and the housing 100 are detachably connected, for example, by bolts, to facilitate subsequent repair and replacement of the motor 300, thereby reducing maintenance costs.

[0056] In addition, the shielding portion 311 of the mounting shell 310 is located in the air duct 110, so the mounting shell 310 can shield the connection between the motor 300 and the cross-flow wind wheel 200 through the shielding portion 311. When the mounting shell 310 is separated from the casing 100, the connection between the motor 300 and the cross-flow wind wheel 200 is exposed, which facilitates the connection and separation between the motor shaft of the motor 300 and the cross-flow wind wheel 200.

[0057] Since the groove wall of the installation groove 111 is provided with a notch 113, and the notch 113 is configured to avoid the shielding portion 311, when the installation shell 310 is connected to the housing 100, the shielding portion 311 and the side wall of the installation groove 111 jointly form a complete groove space, and are configured to accommodate the end of the cross-flow impeller 200, thereby ensuring the stability of the gas flow and flow rate at the end of the cross-flow impeller 200, and then realizing the transmission connection between the motor shaft of the motor 300 and the cross-flow impeller 200, it can also ensure the stability of the gas flow and flow rate at the end where the cross-flow impeller 200 is connected to the motor shaft, thereby reducing the probability of surge and reducing noise.

[0058] In some embodiments of the present application, in the axial direction of the cross-flow fan 200, the dimension of the impeller 210 blocked by the shielding portion 311 is the same as the dimension of the impeller 210 extending into the mounting slot 111. In other words, the dimension of the impeller 210 blocked by the shielding portion 311 in the axial direction is also L1. In this way, the dimension blocked by the end of the impeller 210 facing the motor 300 is uniform in the circumferential direction, which helps to ensure stable airflow at the end of the impeller 210 facing the motor 300, further reduces the probability of surge at the end of the impeller 210 facing the motor 300, and thus reduces the noise of the indoor unit 1.

[0059] In some embodiments of the present application, as shown in Figure 7, the notch 113 includes a bottom wall notch 1131 and a side wall notch 1132. The bottom wall notch 1131 and the side wall notch 1132 are connected. The bottom wall notch 1131 is formed on the bottom wall of the mounting groove 111, and the side wall notch 1132 is formed on the side wall of the mounting groove 111.

[0060] The shielding portion 311 includes a first shielding section 3111 and a second shielding section 3112. The first shielding section 3111 and the second shielding section 3112 are connected. The first shielding section 3111 is located in the bottom wall notch 1131, and the second shielding section 3112 is located in the side wall notch 1132. The side of the first shielding section 3111 facing the end cap 220 is flush with the side of the bottom wall of the mounting groove 111 facing the end cap 220.

[0061] That is, in the axial direction of the crossflow impeller, the distance between the side surface of the first shielding section 3111 facing the end cover 220 and the outer peripheral surface of the end cover 220 is the same as the distance between the bottom wall of the mounting groove 111 and the outer peripheral surface of the end cover 220 .

[0062] In this way, the cross-flow fan wheel 200 has the same axial distance from the bottom wall of the mounting groove 111 and the side surface of the first shielding section 3111 facing the end cover 220, and the flow gap of the airflow in the circumferential direction of the cross-flow fan wheel 200 is roughly the same, which is conducive to ensuring the stability of the airflow at one end of the impeller 210 toward the motor 300, further reducing the probability of surge at the end of the impeller 210 toward the motor 300, thereby reducing the noise of the indoor unit 1.

[0063] In some embodiments of the present application, as shown in FIG6 , the distance between the inner sidewall of the second shielding section 3112 and the outer circumference of the end cap 220 is the same as the distance between the inner sidewall of the mounting groove 111 and the outer circumference of the end cap 220. In other words, the inner sidewall of the second shielding section 3112 and the inner circumference of the mounting groove 111 can be coplanar, and the distance between the inner sidewall of the second shielding section 3112 and the outer circumference of the end cap 220 can be L3. In this way, the radial distance between the crossflow impeller 200 and the inner sidewall of the mounting groove 111 and the inner sidewall of the second shielding section 3112 is the same, and the airflow clearance around the crossflow impeller 200 is substantially uniform. This helps ensure stable airflow toward the end of the impeller 210 facing the motor 300, further reducing the probability of surge at the end of the impeller 210 facing the motor 300, thereby reducing noise from the indoor unit 1.

[0064] In some embodiments of the present application, as shown in Figures 2-3, one of the second shielding section 3112 and the sidewall of the mounting groove 111 is provided with a positioning groove 312, and the other is provided with a positioning protrusion 112, and the positioning groove 312 cooperates with the positioning protrusion 112. By providing the positioning groove 312 and the positioning protrusion 112 to cooperate, it is possible to achieve pre-positioning between the mounting shell 310 and the housing 100, facilitating the subsequent fixing of the mounting shell 310 to the housing 100, and both the positioning groove 312 and the positioning protrusion 112 can be observed by the staff, and the cooperation between the positioning groove 312 and the positioning protrusion 112 does not have a blind spot in the field of vision, and the cooperation between the positioning groove 312 and the positioning protrusion 112 is more convenient.

[0065] The following describes a HVAC system according to an embodiment of the present application with reference to the accompanying drawings, wherein the HVAC system includes the indoor unit 1 described above. For example, the HVAC system may be an air conditioner, a water heater, or a heat pump.

[0066] According to the HVAC system of the embodiment of the present invention, by providing the above-mentioned indoor unit 1, it is possible to suppress surge at the end of the crossflow impeller 200, and has the advantage of low noise.

[0067] Other structures and operations of the indoor unit 1 and the HVAC system having the same according to the embodiment of the present application are well known to those skilled in the art and will not be described in detail here.

[0068] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0069] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An indoor unit, wherein: include: A housing is provided with an air duct, an air outlet and an air inlet, wherein the air duct is connected to the air outlet and the air inlet, and at least one side wall of the air duct is provided with a mounting groove in the length direction of the housing; A cross-flow fan is arranged in the air duct and includes an impeller and an end cover. The end of the impeller is connected to the end cover. The end cover and a portion of the impeller are located in the mounting groove. In the axial direction of the cross-flow fan, the dimension of the impeller extending into the mounting groove is L1, 2mm≤L1≤4mm.

2. The indoor unit according to claim 1, wherein: In the axial direction of the crossflow impeller, the distance between the bottom wall of the mounting groove and the end cover is L2, and L2 is ≥ 5 mm.

3. The indoor unit according to claim 1, wherein: In the radial direction of the crossflow impeller, the distance between the side wall of the mounting groove and the end cover is L3, the diameter of the end cover is L4, and 0.03≤L3 / L4≤0.

05.

4. The indoor unit according to claim 1, wherein In the length direction of the housing, mounting grooves are provided on opposite side walls of the air duct; There are a plurality of crossflow impellers, which are spaced apart along the length direction of the housing, and a portion of the crossflow impeller closest to the mounting slot is located in the mounting slot.

5. The indoor unit according to any one of claims 1 to 4, wherein: Also includes: The motor is provided with a mounting cavity in the housing, the mounting cavity and the air duct are arranged along the length direction of the housing, the motor is located in the mounting cavity, and the motor shaft of the motor is drivingly connected to the crossflow impeller; The mounting shell is connected to the housing and covers the mounting cavity. A notch is provided on the wall of the mounting slot closest to the mounting cavity. The mounting shell is provided with a shielding portion, which is located in the notch and shields the crossflow impeller. The indoor unit according to claim 5, wherein: In the axial direction of the crossflow impeller, the dimension of the shielding portion shielding the impeller is the same as the dimension of the impeller extending into the installation groove.

7. The indoor unit according to claim 5 or 6, wherein: The notch includes a bottom wall notch and a side wall notch, the bottom wall notch and the side wall notch are connected, the bottom wall notch is formed on the bottom wall of the mounting groove, and the side wall notch is formed on the side wall of the mounting groove; The shielding portion includes a first shielding section and a second shielding section, the first shielding section and the second shielding section are connected, the first shielding section is located in the bottom wall notch, and the second shielding section is located in the side wall notch; Wherein, a side surface of the first blocking section facing the end cover is flush with a side surface of the bottom wall of the mounting groove facing the end cover.

8. The indoor unit according to claim 7, wherein: The distance between the inner side wall of the second shielding section and the outer peripheral surface of the end cover is the same as the distance between the inner side wall of the mounting groove and the outer peripheral surface of the end cover.

9. The indoor unit according to claim 7 or 8, wherein: One of the second shielding section and the side wall of the mounting groove is provided with a positioning protrusion and the other is provided with a positioning groove, and the positioning protrusion cooperates with the positioning groove.

10. A heating and ventilation system, wherein: The indoor unit comprises the indoor unit according to any one of claims 1 to 9.

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