Cross-flow impeller, indoor unit, and heating and ventilation system

Abstract

Disclosed in the present application are a cross-flow impeller, an indoor unit, and a heating and ventilation system. The cross-flow impeller comprises a plurality of blades, wherein the plurality of blades are circumferentially arranged at intervals along the axis of rotation of the cross-flow impeller; each blade has a tail end, which is located at the distal end of the blade radially away from the axis of rotation; each tail end has two end points at two ends of the corresponding blade in the direction of the length thereof, and the extension trend from one end point to the other is obliquely set relative to the axis of rotation of the cross-flow impeller; and each tail end comprises a plurality of air output portions that are arranged at intervals, a notch being defined between every two adjacent air output portions.

Description

Crossflow impeller, indoor unit and HVAC system

[0001] This application claims the priority of the Chinese patent application with application number 2024205870626 and application name “Cross-flow fan, indoor unit and HVAC system” filed with the State Intellectual Property Office on March 25, 2024; and the priority of the Chinese patent application with application number 2024103452822 and application name “Cross-flow fan, indoor unit and HVAC system”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of HVAC technology, and in particular to a crossflow impeller, an indoor unit and a HVAC system. Background Art

[0003] Crossflow impellers are widely used in indoor units of HVAC systems due to their compact structure, small size, and uniform airflow.

[0004] However, in the related art, the cross-flow impeller causes the noise intensity of the indoor unit to be relatively high during operation. Therefore, to address this problem of high noise intensity, a new design solution is urgently needed to reduce the intensity of the noise generated by the indoor unit and improve the user experience. Summary of the Invention

[0005] The embodiments of the present application provide a cross-flow impeller, an indoor unit, and a HVAC system, which can reduce the intensity of the noise generated by the indoor unit to enhance the user experience.

[0006] In a first aspect, an embodiment of the present application provides a crossflow rotor, comprising a plurality of blades, the plurality of blades being circumferentially spaced apart along a rotation axis of the crossflow rotor, each blade having a tail end, the tail end being located at a distal end of the blade radially away from the rotation axis;

[0007] The tail end has two end points at both ends along the length direction of the blade, and the extension trend from one end point to the other end point is inclined relative to the rotation axis of the crossflow impeller;

[0008] The tail end includes a plurality of air outlet portions arranged at intervals, and a cutout is defined between two adjacent air outlet portions.

[0009] In some embodiments, the plurality of blades are intersected along a first cross-section, the first cross-section being disposed at an angle to the rotation axis;

[0010] The cutouts of at least some of the blades among the plurality of blades are arranged circumferentially along the rotation axis of the crossflow impeller in a first cross section.

[0011] In some embodiments, the cutout has a bottom wall along the recessed direction, and the bottom walls of the plurality of cutouts located on the first cross section are located on the same arc line.

[0012] In some embodiments, bottom walls of the plurality of cutouts located on the first cross section are located on the same arc, and the center of the arc is located on the rotation axis.

[0013] In some embodiments, bottom walls of the plurality of cutouts located on the first cross section are located on the same elliptical arc, and the center of the elliptical arc is located on the rotation axis.

[0014] In some embodiments, the center of the arc is eccentrically disposed relative to the rotation axis.

[0015] In some embodiments, the cutout has a bottom wall along the recessed direction, and each of the bottom walls of the plurality of cutouts located on the first cross section has the same distance from the rotation axis.

[0016] In some embodiments, the bottom walls of the multiple cutouts located on the first cross-section are arranged in an arc shape, the center of each bottom wall is located on the rotation axis, the radii of the multiple bottom walls are the same or the multiple bottom walls have more than two different radius values.

[0017] In some embodiments, the incision has a bottom wall along the recessed direction, and when observed from the first cross-section, the bottom walls of multiple incisions are located on the first circle, and the end edges of multiple air outlets are located on the second circle, the first circle and the second circle are concentric circles, and the centers of the first circle and the second circle are both located on the rotation axis.

[0018] In some embodiments, bottom walls of the plurality of cutouts are located on an ellipse, distal edges of the plurality of air outlet portions are located on a circle, and the center of the ellipse and the center of the circle are both located on the rotation axis.

[0019] In some embodiments, each of the multiple blades has multiple cuts arranged in sequence along the length direction, and multiple cuts corresponding to the same serial number are formed in the multiple blades, and at least one of the multiple cuts on the serial number is located on the same first cross-section, and the first cross-section is set at an angle to the rotation axis.

[0020] In some embodiments, the plurality of cutouts in each sequence number are located on a first cross section, and the plurality of first cross sections are arranged in parallel along the rotation axis.

[0021] In some embodiments, each of the first cross-sections is defined as a center plane of a corresponding plurality of the cutouts, and the plurality of the first cross-sections are arranged equidistantly or unequally.

[0022] In some embodiments, when viewed along any of the first cross sections, each of the cutouts has a bottom wall along the recessed direction, and the bottom walls are at the same distance from the rotation axis.

[0023] In some embodiments, when observed along any of the first cross-sections, the bottom wall of each of the cutouts is located on a first circle, the end edge of each of the air outlet portions is located on a second circle, the first circle and the second circle are concentric circles, and the centers of both circles are located on the rotation axis.

[0024] In some embodiments, the blade includes a pressure surface and a suction surface disposed opposite to each other along a thickness direction thereof, the suction surface faces the rotation axis of the crossflow impeller along a radial direction of the crossflow impeller, and the tail end is connected between the pressure surface and the suction surface;

[0025] The incision extends to the pressure surface and passes through the suction surface.

[0026] In some embodiments, the pressure surface, the suction surface, and the air outlet are all smoothly connected to the wall surface of the incision.

[0027] In some embodiments, the suction surface is arranged in an arc shape, and the projection shape of the incision on the tangent plane of the top of the suction surface arc is rectangular, triangular or trapezoidal.

[0028] In some embodiments, the extension trends from one end point to the other end point of the tail ends of different blades are consistent in the inclination direction relative to the rotation axis of the crossflow impeller.

[0029] In some embodiments, the extension trends from one end point to the other end point of the tail ends of different blades have the same inclination angle relative to the rotation axis of the crossflow impeller.

[0030] In some embodiments, the inclination angle of the extension trend from one end point to the other end point of the tail end of different blades relative to the rotation axis of the crossflow impeller is greater than 0 degree and less than or equal to 5 degrees.

[0031] In some embodiments, the crossflow rotor further comprises: two end plates, the two end plates being spaced apart along the rotation axis of the crossflow rotor, and the plurality of blades being connected between the two end plates;

[0032] Wherein, in the radial direction of the crossflow impeller, each of the blades does not extend beyond the outer edge of the end plate.

[0033] In some embodiments, the crossflow rotor further comprises two end plates and a middle section plate. The two end plates are spaced apart on the rotation axis of the crossflow rotor, and the plurality of blades are connected between the two end plates. The middle section plate is connected to the blades and divides the blades between the two end plates into a plurality of rotor sections arranged along the rotation axis of the crossflow rotor, each rotor section comprising a plurality of blades.

[0034] The extension trends from one end point to the other end point of the tail ends of the blades of different wind wheel segments are consistent in their inclination directions relative to the rotation axis of the crossflow wind wheel.

[0035] In some embodiments, blades of two adjacent wind wheel segments are alternately arranged along the circumference of the cross-flow wind wheel.

[0036] In some embodiments, when projected along the direction of the rotation axis of the crossflow rotor, in two adjacent rotor segments, the blades of one rotor segment do not overlap with the projections of the blades of the other rotor segment.

[0037] In some embodiments, each of the blades is twisted so that the extension trend between one end point and the other end point of the tail end is inclined relative to the rotation axis of the crossflow impeller; or,

[0038] The crossflow blower also includes two end plates, which are arranged at intervals along the rotation axis of the crossflow blower, and the blades are installed between the two end plates at an angle relative to the rotation axis of the crossflow blower, so that the extension trend between one end point of the tail end to the other end point is inclined relative to the rotation axis of the crossflow blower.

[0039] In some embodiments, the extension trend from one end point to the other end point of the tail end is in a straight line or an arc shape.

[0040] In a second aspect, an embodiment of the present application provides an indoor unit, which includes a casing and the cross-flow impeller as described above, wherein the cross-flow impeller is accommodated inside the casing.

[0041] In some embodiments, the housing includes a volute tongue, the volute tongue includes a volute tongue body and a plurality of guide ribs, the plurality of guide ribs are protruded from the volute tongue body at intervals, and a guide groove is defined between two adjacent guide ribs;

[0042] Wherein, when the cross-flow impeller is rotated to any angle, along the air outlet direction of the cross-flow impeller, the air outlet portion of the blade whose tail end is opposite to the guide rib is opposite to the guide groove, and the cutout of the blade is opposite to the guide rib.

[0043] In a third aspect, an embodiment of the present application provides a HVAC system, which includes an outdoor unit and an indoor unit as described above, wherein the outdoor unit is connected to the indoor unit.

[0044] Based on the crossflow impeller, indoor unit, and HVAC system of the embodiments of the present application, by arranging the end point line at an angle relative to the rotation axis of the crossflow impeller and providing a notch at the tail end, the crossflow impeller of the embodiments has at least the following technical effects:

[0045] First, based on the arrangement of the end point connection line being inclined relative to the rotation axis of the crossflow impeller, by making the extension trend between one end point and the other end point of the tail end inclined relative to the rotation axis of the crossflow impeller, and providing a notch on the tail end, the crossflow impeller of this embodiment has at least the following technical effects:

[0046] First, by tilting the extension trend relative to the rotation axis of the crossflow impeller, the airflows sent from different regions along the extension direction of the tail end of the same blade can impact the volute tongue at different times. In this way, the airflows sent from different regions of the tail end will have different impact phases on the volute tongue when passing through the volute tongue, making the frequency spectrum characteristics discrete, less likely to resonate, and effectively reducing the intensity of noise.

[0047] Secondly, based on the setting of the incision, along the thickness direction of the blade, the airflow in the space on one side of the tail end can supplement the airflow in the space on the other side, so that the flow state of the airflow at the incision can transition from a laminar state to a turbulent state, so that in the process of the airflow flowing to the snail tongue, the large vortex in the wake of the airflow can be transformed into multiple small vortices in advance. In this way, not only can the intensity of the noise generated by the airflow in the process of flowing to the snail tongue be reduced, but also in the form of multiple small vortices impacting the snail tongue, the intensity of the noise generated will be lower than that in the form of large vortices impacting the snail tongue.

[0048] Finally, by extending the tendency to incline relative to the rotation axis of the cross-flow impeller and coordinating the setting of the cutout, the intensity of the noise generated by the indoor unit during operation can be effectively reduced, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] FIG1 is a schematic structural diagram of an indoor unit according to an embodiment of the present application;

[0050] FIG2 is a schematic diagram of the cross-sectional structure along the AA plane in FIG1 ;

[0051] FIG3 is a schematic diagram of the cooperation between the crossflow impeller and the volute tongue shown in FIG2 ;

[0052] FIG4 is a schematic structural diagram of the crossflow impeller shown in FIG2 ;

[0053] FIG5 is a schematic diagram of the cross-sectional structure of the first cross section along line BB shown in FIG4 ;

[0054] FIG6 is a schematic diagram of the connection structure between the middle section plate and the wind wheel segment shown in FIG4 ;

[0055] FIG7 is a partial enlarged view of point B in FIG6;

[0056] FIG8 is a schematic diagram of the connection structure of the end plate, the middle section plate and the wind wheel segment shown in FIG4 from one perspective;

[0057] FIG9 is a schematic diagram of the connection structure of the end plate, the middle section plate and the wind wheel segment shown in FIG4 from another perspective.

[0058] Explanation of the accompanying numbers: 1000, indoor unit; 100, cross-flow impeller; 10, blade; 11, tail end; 111, air outlet; 113, cutout; 1131, bottom wall; 13, pressure surface; 15, suction surface; 30, end plate; 50, middle section plate; 70, impeller section; 300, casing; 310, volute tongue; 320, volute tongue body; 330, guide rib; 340, guide groove; L1, extension trend; L2, rotation axis.

[0059] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of this application clearer, the following part will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0061] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0062] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0064] Referring to Figure 1 , an embodiment of the present application provides a heating and ventilation system. In this embodiment, the heating and ventilation equipment includes, but is not limited to, air conditioners, multi-split units, and heat pumps, and can be used in large-scale locations such as shopping malls and office buildings. The heating and ventilation system may include an indoor unit 1000, an outdoor unit (not shown), and a connecting pipe (not shown). The indoor unit 1000 is connected to the outdoor unit via the connecting pipe, forming a circulation flow path between the indoor unit 1000 and the outdoor unit.

[0065] In some actual usage scenarios, the indoor unit 1000 of the present application can be installed indoors, and the outdoor unit is responsible for cooling or heating, and transports refrigerant or chilled water and other media through connecting pipes. After the refrigerant or chilled water and other media exchange heat with the indoor air and outdoor air respectively, the indoor unit 1000 is responsible for transporting cold air or hot air into the room to achieve the effect of cooling or heating.

[0066] Specifically, the indoor unit 1000 may include one of a ceiling unit, a duct unit and a wall-mounted air-conditioning indoor unit 1000, wherein the ceiling unit is usually embedded in the ceiling in the form of a suspended ceiling, so as to hide the ceiling unit through the ceiling. In this way, the ceiling unit has a better hiding effect and is more beautiful than other forms of the indoor unit 1000. This embodiment does not specifically limit the specific form of the indoor unit 1000.

[0067] Please refer to FIG. 1 to FIG. 4 . In some embodiments, the indoor unit 1000 includes a casing 300 and a cross-flow impeller 100 . The cross-flow impeller 100 is accommodated inside the casing 300 .

[0068] The housing 300 can be roughly rectangular in shape, and can be made of metal, which has advantages such as good strength, lightness, and corrosion resistance. Of course, the housing 300 can also be made of plastic, which has advantages such as light weight, low cost, and easy processing and molding. This embodiment does not limit the shape and material of the housing 300. The housing 300 is provided with an air inlet and an air outlet, and a fan cavity is formed inside the housing 300 to accommodate the crossflow impeller 100. The air inlet and the air outlet are respectively connected to the fan cavity. In this way, the crossflow impeller 100 can promote the flow of air from the air inlet into the fan cavity, so that the air flows into the interior of the crossflow impeller 100 and sends the airflow to the air outlet, and then blows it into the use scene through the air outlet.

[0069] The housing 300 may include a volute tongue 310, which is configured to divide the airflow sent by the wind wheel to the air outlet so that part of the airflow can flow smoothly to the air outlet. When the airflow flows through the volute tongue 310, it will generate a relatively high intensity noise between the volute tongue 310. Based on this, in order to reduce the intensity of the noise described above, this embodiment focuses on improving the cross-flow wind wheel 100 to solve this technical problem.

[0070] The crossflow rotor 100 has the advantages of energy saving, high air volume, low operating noise, and simple installation. Specifically, the crossflow rotor 100 can be in the shape of a long cylinder. In some embodiments, the crossflow rotor 100 includes blades 10. The cross-sectional shape of the blades 10 can be airfoil-shaped. The airfoil shape can optimize the distribution of airflow on the surface of the blades 10, making the airflow flowing through the surface of the blades 10 more uniform and reducing the turbulence of the airflow on the surface of the blades 10, thereby improving the overall aerodynamic performance of the crossflow rotor 100. For example, the airfoil shape can be a symmetrical airfoil, a flat-convex airfoil, or a concave-convex airfoil, but this embodiment is not limited to this. The blades 10 can be made of plastic, which has advantages such as light weight and corrosion resistance. For example, they can be made of ASG (glass fiber reinforced AS resin). Of course, this embodiment is not limited to this. The blades 10 can also be made of metal, which has advantages such as high strength to maintain long-term stable operation without deformation.

[0071] There are multiple blades 10, and the multiple blades 10 are arranged at intervals along the circumferential direction of the rotation axis L2 of the crossflow impeller 100. Each blade 10 has a tail end 11. It can be understood that when the airflow flows through the blade 10, it will eventually flow out from the tail end 11 and flow toward the volute tongue 310.

[0072] The trailing end 11 has two endpoints along the length of the blade 10, and the extension direction L1 between one endpoint and the other is inclined relative to the rotation axis L2 of the crossflow rotor 100. That is, there is an angle between the extension direction L1 and the rotation axis L2 of the crossflow rotor 100, and the angle is non-zero. This allows airflow from different regions along the extension direction of the trailing end 11 of the same blade 10 to impact the volute tongue 310 at different times.

[0073] The tail end 11 includes a plurality of air outlet portions 111 disposed at intervals. A cutout 113 is defined between two adjacent air outlet portions 111 . The cutout 113 is configured to transition the flow state of the airflow at the cutout 113 from a laminar flow state to a turbulent flow state.

[0074] It can be understood that along the thickness direction of the blade 10, air flows through the spaces on both sides of the tail end 11. Based on the setting of the incision 113, the air flow in the space on one side will flow to the air flow in the space on the other side to supplement the air flow, thereby enabling the flow state of the air flow at the incision 113 to transition from a laminar state to a turbulent state.

[0075] In summary, by making the extension trend L1 between one end point and the other end point of the tail end 11 inclined relative to the rotation axis L2 of the crossflow impeller 100 and providing the notch 113 on the tail end 11, the crossflow impeller 100 of this embodiment has at least the following technical effects:

[0076] First, by tilting the extension direction L1 relative to the rotation axis L2 of the crossflow impeller 100, the airflows delivered from different regions along the extension direction of the tail end 11 of the same blade 10 can impact the volute tongue 310 at different times. As a result, the airflows delivered from different regions of the tail end 11 impact the volute tongue 310 at different phases when passing through the volute tongue 310. This results in a discrete frequency spectrum, making resonance less likely and effectively reducing noise intensity.

[0077] Secondly, based on the setting of the incision 113, along the thickness direction of the blade 10, the airflow in the space on one side of the tail end 11 can supplement the airflow in the space on the other side, so that the flow state of the airflow at the incision 113 can transition from a laminar state to a turbulent state, so that in the process of the airflow flowing to the snail tongue 310, the large vortex in the wake of the airflow can be converted into multiple small vortices in advance. In this way, not only can the intensity of the noise generated by the airflow in the process of flowing to the snail tongue 310 be reduced, but also in the form of multiple small vortices impacting the snail tongue 310, the intensity of the noise generated will be lower than the form of large vortices impacting the snail tongue 310.

[0078] Finally, by extending the trend L1 in an inclined manner relative to the rotation axis L2 of the cross-flow impeller 100 and coordinating the setting of the cutout 113, the intensity of the noise generated by the indoor unit 1000 during operation can be effectively reduced, thereby improving the user experience.

[0079] Please refer to Figure 3. In some embodiments, the volute tongue 310 includes a volute tongue body 320 and a guide rib 330. The guide rib 330 is protruded from the volute tongue body 320. The guide rib 330 and the volute tongue body 320 can be an integrally molded component. This not only enhances the strength of the connection between the guide rib 330 and the volute tongue body 320, but also reduces the number of assembly steps of the guide rib 330 and the volute tongue body 320. Of course, the guide rib 330 and the volute tongue body 320 can also be separate components, which is not limited in this embodiment.

[0080] There are multiple guide ribs 330, each of which is protruded from the volute tongue body 320 at intervals, with guide grooves 340 defined between adjacent guide ribs 330. It is understood that the airflow delivered by the crossflow impeller 100 can flow smoothly toward the air outlet under the guidance of the guide ribs 330 and the guide grooves 340.

[0081] When the cross-flow impeller 100 is rotated to any angle, along the air outlet direction of the cross-flow impeller 100 , the air outlet portion 111 of the blade 10 whose tail end 11 is opposite to the guide rib 330 is opposite to the guide groove 340 , and the cutout 113 of the blade 10 is opposite to the guide rib 330 .

[0082] It is understood that the large vortex in the wake of the airflow discharged from the area of ​​the tail end 11 with the cutout 113 is prematurely transformed into multiple small vortices. However, the airflow discharged from the area of ​​the tail end 11 without the cutout 113, i.e., from the outlet portion 111, requires a longer time to transition from laminar flow to turbulent flow. Therefore, while the relative distance between the volute 310 and the crossflow impeller 100 cannot be increased due to the limited size of the indoor unit 1000, the guide groove 340 is aligned with the outlet portion 111 to appropriately extend the distance the airflow from the outlet portion 111 travels to the volute 310. This allows the large vortex in the wake of the airflow from the outlet portion 111 to be prematurely transformed into multiple small vortices before the airflow strikes the bottom wall of the guide groove 340, thereby further reducing noise intensity. Thus, in this embodiment, the combination of the form in which the extension trend L1 is inclined relative to the rotation axis L2 of the cross-flow impeller 100 and the form in which the cutout 113 is provided on the tail end 11 can achieve a combined noise reduction effect, thereby more effectively reducing the intensity of the noise generated by the indoor unit 1000 during operation.

[0083] Of course, the present application is not limited to this. In other embodiments, when the cross-flow impeller 100 is rotated to any angle, along the air outlet direction of the cross-flow impeller 100, the air outlet portion 111 of the blade 10 whose tail end 11 is opposite to the guide rib 330 is opposite to the guide rib 330, and the cutout 113 of the blade 10 is opposite to the guide groove 340.

[0084] Please refer to Figures 4 to 7. In some embodiments, multiple blades 10 are cross-sectioned along a first cross-section, and the first cross-section is set at an angle to the rotation axis L2. It can be understood that the first cross-section can be set perpendicular to the rotation axis L2, that is, 90 degrees, or 85 degrees, 80 degrees or 75 degrees, etc., and this application does not limit this.

[0085] The cutouts 113 of at least some of the blades 10 among the plurality of blades 10 are arranged circumferentially along the rotation axis L2 of the crossflow impeller 100 in the first cross section.

[0086] From the perspective of noise reduction, if the cutouts 113 of multiple blades 10 are arranged along the rotation axis L2 of the cross-flow wind wheel 100 on the first cross-section instead of being arranged along the rotation axis L2 of the cross-flow wind wheel 100, the cross-flow wind wheel 100 will have a smaller difference in the impact phase on the volute tongue 310 during operation, and there is still a low possibility of resonance. However, the present application arranges the cutouts 113 of at least some of the blades 10 on the first cross-section along the rotation axis L2 of the cross-flow wind wheel 100, so that the cross-flow wind wheel 100 has a larger difference in the impact phase on the volute tongue 310 during operation as much as possible, further reducing the possibility of resonance and more effectively reducing the intensity of noise.

[0087] Please refer to Figures 4 to 7 . Furthermore, the cutout 113 has a bottom wall 1131 along the concave direction, and the bottom walls 1131 of the multiple cutouts 113 located on the first cross section are located on the same arc. This arrangement allows the bottom walls 1131 of the multiple cutouts 113 to all be arcuate surfaces. Therefore, based on the manufacturing process, when the blade 10 is made of plastic and is injection molded, an annular rib can be provided in the mold cavity of the mold used to produce the blade 10. In this way, compared to providing multiple protrusions in the mold cavity to form multiple cutouts 113 in a one-to-one correspondence, or forming multiple cutouts 113 through secondary processing after the crossflow impeller 100 is manufactured, this embodiment can achieve the formation of the cutouts 113 of multiple blades 10 by providing an annular rib in the mold cavity, thereby enabling the production of blades 10 with multiple cutouts 113 at one time, thereby improving production efficiency.

[0088] Moreover, when the bottom wall 1131 of the cutout 113 is an arc-shaped surface, the airflow in the space on one side of the tail end 11 can be guided by the bottom wall 1131 to the space on the other side to supplement the airflow in the space on the other side, so that the flow state of the airflow at the cutout 113 can be accelerated to transition from a laminar state to a turbulent state, thereby achieving a noise reduction effect.

[0089] Referring to Figures 4 to 7 , in some embodiments, the bottom walls 1131 of the multiple cutouts 113 located in the first cross-section are located on the same arc, with the arc's center located on the rotation axis L2. Thus, the inner contour of the annular rib disposed within the mold cavity is circular, so that after the crossflow impeller 100 is formed, the bottom walls 1131 of the multiple cutouts 113 are located on the same arc.

[0090] Optionally, the bottom walls of the multiple cutouts on the first cross section lie on the same elliptical arc, with the center of the elliptical arc located on the rotation axis L2. In this way, the inner contour of the annular rib disposed within the mold cavity is elliptical, so that after the crossflow impeller 100 is formed, the bottom walls 1131 of the multiple cutouts 113 lie on the same elliptical arc.

[0091] Optionally, the center of the arc is eccentrically disposed relative to the rotation axis L2. Thus, the center of the arc of the inner contour of the annular rib disposed within the mold cavity is eccentrically disposed relative to the rotation axis L2, so that after the crossflow impeller 100 is formed, the arc in which the bottom walls 1131 of the plurality of cutouts 113 are located is eccentrically disposed relative to the rotation axis L2.

[0092] Referring to Figures 4 to 7 , in some embodiments, the cutout 113 has a bottom wall 1131 along the concave direction, and each bottom wall 1131 of the multiple cutouts 113 located on the first cross-section is at the same distance from the rotation axis L2. Thus, during the injection molding process, a closed-loop rib can be provided within the mold cavity of the mold used to produce the blade 10, allowing the formation of multiple cutouts 113 through a single rib. This allows blades 10 having multiple cutouts 113 to be manufactured in a single process, improving production efficiency. In this embodiment, the contour line of the bottom wall of the cutout can be arcuate or straight, and this is not a limitation of this embodiment.

[0093] Please refer to Figures 4 to 7 . Furthermore, the bottom wall 1131 of the multiple cutouts 113 located on the first cross-section has an arc-shaped contour, with the center of each bottom wall 1131 located on the rotation axis L2. It will be appreciated that in this embodiment, the contour of the rib is an arc. Thus, multiple cutouts 113 can be formed simultaneously using a single rib. Furthermore, the arc-shaped bottom wall 1131 can guide airflow from one space to the other, supplementing the airflow in the other space. This accelerates the transition of the airflow at the cutouts 113 from laminar to turbulent flow, achieving a noise reduction effect.

[0094] The radii of the multiple bottom walls 1131 are the same or the multiple bottom walls 1131 have two or more different radii. When the convex rib forms the multiple cutouts 113 , the cutouts may be recessed to different degrees.

[0095] Referring to Figures 4 to 7 , in some embodiments, the cutouts 113 have a bottom wall 1131 along the concave direction. When viewed from a first cross-section, the bottom walls 1131 of the multiple cutouts 113 are located on a first circle, while the distal edges of the multiple air outlets 111 are located on a second circle. The first and second circles are concentric, with the centers of the first and second circles both located on the rotation axis L2. Thus, when the multiple cutouts 113 are formed, if the centers of the first and second circles are both located on the rotation axis L2, the ribs within the mold cavity can ensure uniform formation of the multiple cutouts 113 during the primary molding process, resulting in a more regular shape for the cutouts 113.

[0096] In some embodiments, the bottom walls 1131 of the multiple cutouts 113 are located on an ellipse, the distal edges of the multiple air outlets 111 are located on a circle, and the centers of the ellipse and the circle are both located on the rotation axis L2. Thus, when forming the multiple cutouts 113, when the centers of the ellipse and the circle are both located on the rotation axis L2, the ribs provided within the mold cavity can ensure that the multiple cutouts 113 are formed uniformly during the primary molding process, resulting in a more regular shape for the cutouts 113.

[0097] Referring to Figures 4 to 7 , in some embodiments, each of the plurality of blades 10 has a plurality of cutouts 113 arranged sequentially along the length. Each of the plurality of blades 10 has a plurality of cutouts 113 with the same number, and at least one of the cutouts 113 is located on the same first cross-section, which is angled relative to the rotation axis L2. This allows for the provision of multiple ribs within the mold cavity, with at least one rib located on the first cross-section, to form the cutouts 113 of the plurality of blades 10, with at least one of the cutouts 113 located on the same first cross-section.

[0098] Referring to Figures 4 to 7 , each of the plurality of numbered cutouts 113 is located on a first cross-section, and the plurality of first cross-sections are arranged parallel to the rotation axis L2. This allows for the provision of a plurality of ribs within the mold cavity, with the ribs being located on corresponding first cross-sections, such that each of the plurality of numbered cutouts 113 is located on a first cross-section.

[0099] Referring to Figures 4 to 7 , further, each first cross-section is defined as the center plane of the corresponding plurality of cutouts 113, and the plurality of first cross-sections are equidistantly arranged. Thus, within the mold cavity of the mold for producing the blade 10, a plurality of equidistantly distributed ribs can be provided, thereby simplifying the overall mold design and structure, thereby reducing mold costs.

[0100] Optionally, the plurality of first cross sections may be arranged at unequal intervals. Thus, the position of the cutout 113 on the tail end 11 may be adaptively set based on the specific intensity distribution of noise along the rotation axis L2 of the crossflow impeller 100, resulting in the plurality of first cross sections being distributed at unequal intervals.

[0101] Referring to Figures 4 to 7 , in some embodiments, each notch 113 has a bottom wall 1131 along any first cross-section, and the multiple bottom walls 1131 are located at the same distance from the rotation axis L2. Thus, during the injection molding process, a circular rib can be provided within the mold cavity of the mold used to produce the blade 10, thereby improving production efficiency by forming multiple notches 113 in a sequence. In this embodiment, the contour line of the bottom wall of the notch can be arcuate or straight, and this is not a limitation of this embodiment.

[0102] Referring to Figures 4 to 7 , in some embodiments, when viewed along any first cross-section, the bottom wall 1131 of each cutout 113 lies on a first circle, the distal edge of each air outlet 111 lies on a second circle, and the first and second circles are concentric, with their centers both located on the rotation axis. Thus, when forming multiple cutouts 113 , if the centers of the first and second circles are both located on the rotation axis L2 , the ribs within the mold cavity can ensure uniform formation of the multiple cutouts 113 during the single-shot molding process, resulting in a more regular shape for the cutouts 113.

[0103] Please refer to Figures 6 and 7 in combination. In some embodiments, the blade 10 includes a pressure surface 13 and a suction surface 15 that are arranged opposite to each other along the thickness direction thereof. The suction surface 15 faces the rotation axis L2 of the crossflow impeller 100 along the radial direction of the crossflow impeller 100, and the tail end 11 is connected between the pressure surface 13 and the suction surface 15. It can be understood that in the blade 10, the airflow pressure of one of the two opposite surfaces along the thickness direction thereof is lower, and the airflow pressure of the other surface is higher. Therefore, the surface with lower airflow pressure is called the suction surface 15, and the surface with higher airflow pressure is called the pressure surface 13.

[0104] The cutout 113 extends to the pressure surface 13 and penetrates the suction surface 15, and is configured to direct the airflow on the pressure surface 13 toward the suction surface 15. Thus, by extending the cutout 113 to the pressure surface 13 and penetrating the suction surface 15, the transition of the flow state of the airflow at the cutout 113 from a laminar state to a turbulent state can be effectively improved. That is, by increasing the area of ​​the cutout 113, more of the airflow on the side of the pressure surface 13 can flow to the side of the suction surface 15, thereby better supplementing the airflow on the side of the suction surface 15, and more quickly transforming large vortices into multiple small vortices, thereby achieving a better noise reduction effect.

[0105] Of course, the present application is not limited thereto. In other embodiments, the cutout 113 may not extend to the pressure surface 13 but may be provided through the suction surface 15 .

[0106] Furthermore, the pressure surface 13, the suction surface 15, and the air outlet 111 are all smoothly connected to the wall of the cutout 113. This prevents airflow separation from forming turbulence and eddies as it flows through the pressure surface 13, the suction surface 15, the air outlet 111, and the wall of the cutout 113, thereby reducing energy loss and avoiding irregular pressure fluctuations and noise.

[0107] Please refer to Figures 6 and 7. In some embodiments, the suction surface 15 is arranged in an arc shape, and the projection shape of the cutout 113 on the tangent plane of the top of the suction surface 15 is rectangular, triangular or trapezoidal, so that the shape is relatively regular and it is convenient to process the cutout 113.

[0108] Please refer to Figures 8 and 9. The following content will further introduce in detail the specific formation form and specific setting form of the inclined setting of the extension trend L1, based on the angle at which the extension trend L1 is inclined relative to the rotation axis L2 of the cross-flow impeller 100 to reduce the noise intensity of the indoor unit 1000.

[0109] In some embodiments, each blade 10 is twisted so that the extension direction L1 of its tail end 11 from one end point to the other end point is inclined relative to the rotation axis L2 of the crossflow impeller 100. In actual processing, at least two processing methods can be used to achieve the twisting of each blade 10:

[0110] In the first form, the blade 10 is made of plastic and is formed by injection molding. During the demolding process, a rotational demolding method can be adopted. Specifically, during the demolding process, the mold is rotated along the rotation axis, thereby achieving a twisting of the blade 10 during the demolding process, thereby causing the extension trend L1 of the blade 10 to be inclined relative to the rotation axis L2 of the crossflow impeller 100.

[0111] In the second form, after the blade 10 is processed, a torsion is applied only to either end of the blade 10 along its length, or a torsion is applied in a clockwise direction to one end of the blade 10 along its length and a torsion is applied in a counterclockwise direction to the other end, so that the blade 10 itself is twisted.

[0112] Optionally, the crossflow rotor 100 further includes two end plates 30, which are spaced apart along the rotation axis L2 of the crossflow rotor 100, and the blade 10 is installed between the two end plates 30 at an angle relative to the rotation axis L2 of the crossflow rotor 100, so that the extension trend L1 between one end point of the tail end and the other end point is inclined relative to the rotation axis L2 of the crossflow rotor 100.

[0113] It can be understood that both end plates 30 can be provided with mounting grooves, and are projected along the rotation axis L2 of the crossflow wind wheel 100, with the projections of the two mounting grooves partially overlapping or not overlapping. One end of the blade 10 along its length direction is inserted into the mounting groove of one end plate 30, and the other end is inserted into the mounting groove of the other end plate 30. Subsequently, the end portion of the blade 10 is welded in the mounting groove, so that the blade 10 can be installed obliquely between the two end plates 30 relative to the rotation axis L2 of the crossflow wind wheel 100.

[0114] Furthermore, the extension L1 from one end point of the tail end 11 to the other end point is linear or arc-shaped. This makes the tail end 11 more regular, facilitating twisting during processing or tilting for installation. The arc shape can be a single concave arc or a single convex arc, which is not limited in this embodiment.

[0115] 8 and 9 , in some embodiments, the extension trend L1 from one end point to the other end point of the tail end 11 of different blades 10 has the same inclination direction relative to the rotation axis L2 of the crossflow impeller 100 .

[0116] In this way, the distance between two adjacent blades 10 along the circumference of the cross-flow wind wheel 100 can be made as consistent as possible everywhere on the rotation axis L2 of the cross-flow wind wheel 100. Compared with the form in which the distance difference is too large, this embodiment can, on the one hand, avoid turbulence when the airflow flows out from between two adjacent blades 10, so as to ensure the stability of the airflow and reduce the generation of noise. On the other hand, it can ensure that the amount of air sent by the cross-flow wind wheel 100 to the air outlet along its rotation axis L2 is kept as consistent as possible, thereby improving the uniformity of the air supply. In addition, when the air supply is uniform, there is no need to increase the rotation efficiency of the cross-flow wind wheel 100 due to the smaller air supply in some areas, thereby ensuring the aerodynamic efficiency of the cross-flow wind wheel 100 and improving the performance of the cross-flow wind wheel 100.

[0117] Of course, the present application is not limited to this. In other embodiments, the extension trends L1 of different blades 10 may have inconsistent inclination directions relative to the rotation axis L2 of the cross-flow wind wheel 100. For example, along the circumference of the cross-flow wind wheel 100, the extension trends L1 of two adjacent blades 10 may have inconsistent inclination directions relative to the rotation axis L2 of the cross-flow wind wheel 100.

[0118] Furthermore, the extension angle L1 of the tail ends 11 of the different blades 10 from one end point to the other, relative to the rotation axis L2 of the crossflow impeller 100, is uniform. This further ensures uniformity along the rotation axis L2 of the crossflow impeller 100, thereby reducing noise while ensuring uniform airflow.

[0119] In other embodiments, the inclination angles of the extension trends L1 from one end point to the other end point of the tail ends 11 of different blades 10 relative to the rotation axis L2 of the crossflow wind wheel 100 may be unequal. For example, along the circumference of the crossflow wind wheel 100, the difference in inclination angles of two adjacent blades 10 relative to the rotation axis L2 of the crossflow wind wheel 100 is 0.5 degrees. This embodiment does not impose any restrictions on this.

[0120] In some embodiments, the inclination angle L1 of the extension from one end point to the other end point of the trailing ends 11 of the different blades 10 relative to the rotation axis L2 of the crossflow impeller 100 is greater than 0 degrees and less than or equal to 5 degrees. This effectively reduces the noise level of the indoor unit 1000 while ensuring that the air volume supplied by the crossflow impeller 100 is not attenuated. Furthermore, it is understood that if the air volume supplied by the crossflow impeller 100 is not attenuated, given that the indoor unit 1000 has a preset air volume, there is no need to increase the efficiency of the crossflow impeller 100. This also reduces the noise generated during the operation of the crossflow impeller 100.

[0121] If the angle of extension L1 of the blade 10 relative to the rotation axis L2 of the crossflow rotor 100 is equal to 0 degrees, the extension L1 is parallel to the rotation axis L2 of the crossflow rotor 100, causing the airflow from the trailing end 11 to strike the volute 310 at or near the same time, resulting in a high noise intensity. If the angle of extension L1 of the blade 10 relative to the rotation axis L2 of the crossflow rotor 100 is greater than 5 degrees, the distance between the trailing end 11 and the volute 310 is too large, resulting in excessive airflow loss and, in turn, a reduction in the airflow output of the crossflow rotor 100.

[0122] For example, the inclination angle of the extension trend L1 of the blade 10 relative to the rotation axis L2 of the crossflow impeller 100 is specifically 0.5 degrees, 1 degree, 2 degrees, 3 degrees, 4 degrees or 5 degrees, etc., which is not limited in this embodiment.

[0123] Referring to Figures 8 and 9 , in some embodiments, the crossflow rotor 100 further includes two end plates 30 spaced apart along the rotation axis L2 of the crossflow rotor 100. A plurality of blades 10 are connected between the two end plates 30. In the radial direction of the crossflow rotor 100, the blades 10 do not extend beyond the outer edges of the end plates 30. This ensures that the extension direction L1 is tilted relative to the rotation axis L2 of the crossflow rotor 100, thereby preventing the trailing ends 11 of the blades 10 from extending beyond the outer edges of the end plates 30, thereby reducing the possibility of injuries to workers caused by contact with the trailing ends 11.

[0124] Of course, the present application is not limited thereto. In other embodiments, each blade 10 may extend outward from the outer edge of the end plate 30 on the basis of realizing that the extension trend L1 is tilted relative to the rotation axis L2 of the crossflow impeller 100 .

[0125] 8 and 9 , in some embodiments, the crossflow impeller 100 further includes two end plates 30 and a middle plate 50. The end plates 30 and the middle plate 50 may both be circular and made of plastic to reduce the overall weight of the crossflow impeller 100.

[0126] Two end plates 30 are spaced apart on the rotation axis L2 of the crossflow rotor 100. Multiple blades 10 are connected between the two end plates 30. A middle section plate 50 is connected to the blades 10 and divides the blades 10 between the two end plates 30 into multiple rotor segments 70 arranged along the rotation axis L2 of the crossflow rotor 100. Each rotor segment 70 includes multiple blades 10. The extension direction L1 of the trailing ends 11 of the blades 10 in different rotor segments 70, extending from one end point to the other, is aligned with respect to the rotation axis L2 of the crossflow rotor 100.

[0127] In this way, while maintaining consistent inclination, noise generation can be effectively reduced while ensuring that the air output does not attenuate. It is understood that if the extension trends L1 of the blades 10 of two adjacent rotor segments 70 along the rotation axis L2 of the crossflow rotor 100 are inconsistently inclination relative to the rotation axis L2 of the crossflow rotor 100, the airflows flowing through the two rotor segments 70 will collide, causing the flow velocities of the airflows along the rotation axis L2 of the crossflow rotor 100 to partially offset, thereby reducing the air output of the crossflow rotor 100. Furthermore, when the airflows collide, turbulence will occur, resulting in noise generation.

[0128] In other embodiments, in order to change the air supply direction of the crossflow rotor 100, the extension trends L1 of the blades 10 of different rotor segments 70 may also have different inclination directions relative to the rotation axis L2 of the crossflow rotor 100, which is not limited in this embodiment.

[0129] Referring to Figures 8 and 9 , the blades 10 of two adjacent rotor segments 70 are further arranged alternately along the circumference of the crossflow rotor 100. Thus, during the rotation of the crossflow rotor 100, the blades 10 of the two adjacent rotor segments 70 deliver air at staggered intervals, causing the airflows delivered by the blades 10 of the two adjacent rotor segments 70 to impact the volute tongue 310 at different times. The airflows impacting the volute tongue 310 at different phases when passing through the volute tongue 310, resulting in a discrete frequency spectrum that is less likely to resonate, effectively reducing noise intensity. Furthermore, in this embodiment, the combination of the extension trend L1 being tilted relative to the rotation axis L2 of the crossflow rotor 100, the notch 113 being provided on the tail end 11, and the air outlet 111 being opposite the guide groove 340 and the notch 113 being opposite the guide rib 330, achieves a combined noise reduction effect, further effectively reducing the noise intensity generated during operation of the indoor unit 1000.

[0130] Furthermore, when projected along the rotation axis L2 of the crossflow rotor 100, the blades 10 of one adjacent rotor segment 70 do not overlap with the blades 10 of the other rotor segment 70. This ensures that the airflow from the blades 10 of the two adjacent rotor segments 70 strikes the volute tongue 310 at different times, effectively reducing noise levels.

[0131] Of course, in other embodiments, when projected along the direction of the rotation axis L2 of the crossflow wind wheel 100, the projections of the blades 10 of one wind wheel segment 70 and the blades 10 of the other wind wheel segment 70 in two adjacent wind wheel segments 70 may also partially overlap, and the present application does not impose any restrictions on this.

[0132] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0133] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A crossflow impeller, wherein: The crossflow impeller comprises a plurality of blades, wherein the plurality of blades are circumferentially spaced apart along the rotation axis of the crossflow impeller, and each of the blades has a tail end, and the tail end is located at a distal end of the blade radially away from the rotation axis; The tail end has two end points at both ends along the length direction of the blade, and the extension trend from one end point to the other end point is inclined relative to the rotation axis of the crossflow impeller; The tail end includes a plurality of air outlet portions arranged at intervals, and a cutout is defined between two adjacent air outlet portions.

2. The crossflow impeller according to claim 1, wherein: cutting across the plurality of blades along a first cross-section, the first cross-section being disposed at an angle to the axis of rotation; The cutouts of at least some of the blades among the plurality of blades are arranged circumferentially along the rotation axis of the crossflow impeller in a first cross section.

3. The crossflow impeller according to claim 2, wherein: The cutout has a bottom wall along the recessed direction, and the bottom walls of the plurality of cutouts located on the first cross section are located on the same arc line.

4. The crossflow impeller according to claim 3, wherein: The bottom walls of the plurality of cutouts on the first cross section are located on the same arc, and the center of the arc is located on the rotation axis.

5. The crossflow impeller according to claim 3, wherein: The bottom walls of the plurality of cutouts on the first cross section are located on a same elliptical arc, and the center of the elliptical arc is located on the rotation axis.

6. The crossflow impeller according to claim 3, wherein: The center of the arc is eccentrically arranged compared to the rotation axis.

7. The crossflow impeller according to claim 2, wherein: The cutout has a bottom wall along a recessed direction, and each of the bottom walls of the plurality of cutouts located on the first cross section has the same distance from the rotation axis.

8. The crossflow impeller according to claim 7, wherein: The bottom walls of the multiple cutouts on the first cross section have arc-shaped contours, the center of each bottom wall is located on the rotation axis, and the radii of the multiple bottom walls are the same or the multiple bottom walls have more than two different radius values.

9. The crossflow impeller according to claim 2, wherein: The incision has a bottom wall along the recessed direction. When observed from the first cross section, the bottom walls of the plurality of incisions are located on the first circle, and the end edges of the plurality of air outlets are located on the second circle. The first circle and the second circle are concentric circles, and the centers of the first circle and the second circle are both located on the rotation axis.

10. The crossflow impeller according to claim 2, wherein: The bottom walls of the plurality of cutouts are located on an ellipse, the end edges of the plurality of air outlets are located on a circle, and the centers of the ellipse and the circle are both located on the rotation axis.

11. The crossflow impeller according to any one of claims 1 to 10, wherein: Each of the multiple blades has multiple cuts arranged in sequence along the length direction, and multiple cuts corresponding to the same serial number are formed in the multiple blades. At least one of the multiple cuts on the serial number is located on the same first cross-section, and the first cross-section is set at an angle to the rotation axis.

12. The crossflow impeller according to claim 11, wherein: The plurality of cuts in each serial number are located on a first cross section, and the plurality of first cross sections are arranged in parallel along the rotation axis.

13. The crossflow impeller according to claim 12, wherein: Each of the first cross sections is defined as a center plane of the corresponding plurality of the cutouts, and the plurality of the first cross sections are arranged at equal or unequal intervals.

14. The crossflow impeller according to claim 11, wherein: When viewed along any of the first cross sections, each of the cutouts has a bottom wall along a recessed direction, and the bottom walls are at the same distance from the rotation axis.

15. The crossflow impeller according to claim 11, wherein: Observing along any of the first cross sections, the bottom wall of each of the cutouts is located on a first circle, the end edge of each of the air outlets is located on a second circle, the first circle and the second circle are concentric circles, and the centers of both circles are located on the rotation axis.

16. The crossflow impeller according to any one of claims 1 to 15, wherein: The blade includes a pressure surface and a suction surface that are arranged opposite to each other along the thickness direction thereof, the suction surface faces the rotation axis of the crossflow impeller along the radial direction of the crossflow impeller, and the tail end is connected between the pressure surface and the suction surface; The incision extends to the pressure surface and passes through the suction surface.

17. The crossflow impeller according to claim 16, wherein: The pressure surface, the suction surface and the air outlet are all smoothly connected to the wall surface of the incision.

18. The crossflow impeller according to claim 16, wherein: The suction surface is arranged in an arc shape, and the projection shape of the incision on the tangent plane of the arc top of the suction surface is rectangular, triangular or trapezoidal.

19. The crossflow impeller according to any one of claims 1 to 18, wherein: The extension trends from one end point to the other end point of the tail ends of different blades are consistent in the inclination direction relative to the rotation axis of the crossflow impeller.

20. The crossflow impeller according to claim 19, wherein: The extension trends from one end point to the other end point of the tail ends of the different blades have the same inclination angle relative to the rotation axis of the crossflow impeller.

21. The crossflow impeller according to any one of claims 1 to 20, wherein: The inclination angle of the extension trend from one end point to the other end point of the tail end of different blades relative to the rotation axis of the crossflow impeller is greater than 0 degree and less than or equal to 5 degrees.

22. The crossflow impeller according to any one of claims 1 to 21, wherein: The crossflow impeller further comprises: two end plates, the two end plates being spaced apart along the rotation axis of the crossflow impeller, and the plurality of blades being connected between the two end plates; Wherein, in the radial direction of the crossflow impeller, each of the blades does not extend beyond the outer edge of the end plate.

23. The crossflow impeller according to any one of claims 1 to 22, wherein: The crossflow impeller further comprises: Two end plates are spaced apart on the rotation axis of the crossflow impeller, and the plurality of blades are connected between the two end plates; and a middle section plate connected to the blades and dividing the blades between the two end plates into a plurality of rotor sections arranged along the rotation axis of the crossflow rotor, each rotor section including a plurality of blades; The extension trends from one end point to the other end point of the tail ends of the blades of different wind wheel segments are consistent in their inclination directions relative to the rotation axis of the crossflow wind wheel.

24. The crossflow impeller according to claim 23, wherein: The blades of two adjacent wind wheel segments are alternately arranged along the circumference of the cross-flow wind wheel.

25. The crossflow impeller according to claim 24, wherein: Projected along the direction of the rotation axis of the crossflow rotor, in two adjacent rotor segments, the blades of one rotor segment do not overlap with the projections of the blades of the other rotor segment.

26. The crossflow impeller according to any one of claims 1 to 25, wherein: Each of the blades is twisted so that the extension trend between one end point and the other end point of the tail end is inclined relative to the rotation axis of the crossflow impeller; or, The crossflow blower also includes two end plates, which are arranged at intervals along the rotation axis of the crossflow blower, and the blades are installed between the two end plates at an angle relative to the rotation axis of the crossflow blower, so that the extension trend between one end point of the tail end to the other end point is inclined relative to the rotation axis of the crossflow blower.

27. The crossflow impeller according to claim 26, wherein: The extension trend between one end point and the other end point of the tail end is in a straight line or an arc shape.

28. An indoor unit, wherein: include: chassis; as well as, The cross flow impeller according to any one of claims 1 to 27, wherein the cross flow impeller is accommodated inside the casing.

29. The indoor unit according to claim 28, wherein The housing includes a volute tongue, and the volute tongue includes: a snail tongue body; and, A plurality of guide ribs, wherein the plurality of guide ribs are protruded from the volute tongue body at intervals, and a guide groove is defined between two adjacent guide ribs; Wherein, when the cross-flow impeller is rotated to any angle, along the air outlet direction of the cross-flow impeller, the air outlet portion of the blade whose tail end is opposite to the guide rib is opposite to the guide groove, and the cutout of the blade is opposite to the guide rib.

30. A heating and ventilation system, wherein: It comprises an outdoor unit and an indoor unit according to claim 28 or 29, wherein the outdoor unit is connected to the indoor unit.

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