Air conditioner indoor unit

Abstract

The application discloses an air conditioner indoor unit, and belongs to the technical field of air conditioners. The air conditioner indoor unit comprises a shell, an impeller, a heat exchanger, a volute and a volute tongue. The volute tongue and the shell form an air inlet air duct, and the volute and the volute tongue form an impeller mounting cavity and an air outlet air duct. The impeller is arranged at the impeller mounting cavity, and the impeller is used for driving airflow to sequentially pass through the air inlet air duct and the impeller mounting cavity to form outlet airflow. The outlet airflow comprises backflow airflow which flows back to the impeller after being divided at the volute tongue, and air outlet airflow which flows to the air outlet air duct. The air outlet airflow exchanges heat with the heat exchanger. A gap between a volute tongue windward surface of the volute tongue and the impeller forms a gap flow channel. A flow guide channel is arranged at the volute tongue, and the flow guide channel is used for guiding a part of the backflow airflow to the gap flow channel. The air conditioner indoor unit can improve the pressure resistance of the cross-flow fan.

Description

Technical Field

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

[0002] Cross-flow fans are widely used in air conditioning units, including wall-mounted and floor-standing units, due to their low noise and uniform airflow. During operation, an eccentric vortex is generated on the impeller near the volute. This vortex causes the airflow to pass through the impeller twice, creating cross-flow. However, when cross-flow fans are used in ducted systems, the area entrained by the eccentric vortex increases with back pressure, intensifying the vortex and reducing the effective cross-flow area inside the fan. Once an eccentric vortex forms at the volute, the volute itself cannot regulate its flow a second or more times. Therefore, cross-flow fans have relatively poor pressure resistance.

[0003] Currently, to improve the pressure resistance of cross-flow fans, a common approach is to incorporate an air supply path into the duct assembly. This path supplies a portion of the outlet airflow to the area between the volute and the upstream side of the impeller. The supplied airflow impacts the edge of the eccentric vortex at the outlet side, thereby enhancing the flow characteristics of the eccentric vortex and improving the fan's pressure resistance. Alternatively, the intensity of the eccentric vortex at the impeller can be increased by directly introducing the outlet airflow into the impeller.

[0004] However, the above measures have limited effect on improving the pressure resistance of cross-flow fans, and cross-flow fans have poor adaptability to operating conditions. Utility Model Content

[0005] This application provides an indoor air conditioning unit that can improve the pressure resistance of a cross-flow fan.

[0006] In one aspect of this application, an indoor air conditioning unit includes: a housing, a heat exchanger, an impeller, a volute tongue, and a volute casing; the heat exchanger is located inside the housing; the volute casing is located inside the housing; the volute tongue is located inside the housing and forms an air inlet duct with the housing, the volute tongue and the volute casing are connected to form an impeller mounting cavity and an air outlet duct; the impeller is located in the impeller mounting cavity and is located between the air inlet duct and the air outlet duct.

[0007] Driven by the impeller, air flows sequentially through the air inlet duct and the impeller mounting cavity to form the outlet airflow. The outlet airflow includes the return airflow that flows to the impeller after being guided and diverted by the volute tongue, and the outlet airflow that flows to the air outlet duct. The outlet airflow exchanges heat with the heat exchanger.

[0008] The volute tongue includes: an air inlet guide surface that forms an air inlet duct with the casing; a windward surface of the volute tongue that faces the impeller, and the gap between the windward surface of the volute tongue and the outer circumferential surface of the impeller forms a gap flow channel, which is used to guide the return airflow; an air outlet surface of the volute tongue that forms an air outlet duct with the volute casing; and a tongue tip surface that connects the windward surface of the volute tongue and the air outlet surface of the volute tongue.

[0009] The tip of the volute tongue includes: an airflow front surface for guiding the airflow to the airflow duct; and a return airflow front surface, which connects the airflow front surface and the volute tongue front surface to guide a portion of the return airflow on the return airflow front surface to the gap channel.

[0010] The volute tongue is provided with a flow channel, the flow inlet of which is located on the windward side of the return airflow, and the flow channel extends from the flow inlet to the gap channel; the flow channel is used to guide a portion of the return airflow on the windward side to the gap channel.

[0011] In this technical solution, a portion of the return airflow can be drawn out through the diversion channel, thereby reducing the return flow that forms the eccentric vortex, shrinking the area of ​​the eccentric vortex, increasing the effective working area at the impeller, and improving the pressure resistance of the cross-flow fan. In addition, the diversion channel sends the drawn airflow to the gap flow channel, which can form an impact interception of the gap return flow, thereby further controlling the eccentric vortex and improving the pressure resistance of the cross-flow fan.

[0012] In some embodiments, the boundary line between the outlet airflow and the return airflow formed after the outlet airflow is guided and diverted by the volute tongue is defined as the velocity cutoff line Co; the windward side of the return airflow and the windward side of the outlet airflow are located on both sides of the velocity cutoff line Co; the inlet is located on the side of the velocity cutoff line Co closer to the impeller, and the outlet is located on the windward side of the volute tongue.

[0013] In this technical solution, by setting the diversion channel on the side of the velocity cutoff line Co close to the impeller, it can be ensured that the airflow flowing into the diversion inlet is a return flow.

[0014] In some embodiments, on a section of the indoor unit of the air conditioner perpendicular to the axis of the impeller, the radius of the impeller is defined as R, the minimum width of the flow channel in the radial direction of the impeller is W2, the minimum distance between the impeller and the volute tongue is W0, and the velocity cutoff line Co is located outside a circle with the impeller axis O as the center and R+W0+2W2 as the radius.

[0015] In this technical solution, by limiting the position range of the velocity cutoff line Co, the airflow flowing into the diversion channel can be made to be a loop airflow, thus preventing the outlet airflow from entering the diversion channel.

[0016] In some embodiments, in the radial direction of the impeller, the distance between the end of the volute tongue facing the windward side and the tip of the volute tongue and the impeller is W1, and the distance L from the inlet to the axis O of the impeller satisfies R+W1≤L.

[0017] In this technical solution, by limiting the distance L from the inlet to the impeller within this range, it can be ensured that the airflow flowing into the inlet channel is the return airflow before flowing into the gap channel.

[0018] In some embodiments, the drainage outlet is located on the windward side of the volute tongue near the air inlet guide surface.

[0019] In this technical solution, the location of the drainage outlet is close to the air inlet guide surface, so that the drainage outlet is connected to the tail end of the gap flow channel, allowing the airflow flowing out from the drainage outlet to impact the eccentric vortex. The control effect of the eccentric vortex is better at this location.

[0020] In some embodiments, one sidewall defining the drainage channel is connected to the air inlet guide surface at the drainage outlet by an arc transition.

[0021] In this technical solution, the arc transition surface is conducive to the flow of air; in addition, the outlet is located on the windward side of the volute tongue, close to the air inlet guide surface, which can ensure that the airflow from the outlet can flow to the tail end of the gap channel.

[0022] In some embodiments, the drainage channel includes: a first drainage segment connected to the drainage inlet; and a second drainage segment connected to the drainage outlet, wherein the angle between the second drainage segment and the first drainage segment is not less than 90°.

[0023] In this technical solution, the turning angle on the diversion channel is relatively large, which is conducive to the smooth flow of air in the diversion channel.

[0024] In some embodiments, one wall defining the drainage channel is connected to the windward surface of the volute tongue at the drainage inlet via a first arc surface, and the other wall defining the drainage channel is connected to the air outlet surface of the volute tongue at the drainage inlet via a second arc surface.

[0025] In this technical solution, the first and second arc surfaces make the flow channel at the inlet smooth, which is conducive to the flow of air into the flow channel.

[0026] In some embodiments, the drainage channel gradually expands from the drainage inlet to the drainage outlet.

[0027] In this technical solution, the flow channel gradually expands with the direction of airflow, which allows the airflow to gradually slow down within the flow channel, thereby reducing the impact of the airflow flowing out of the flow channel on the impeller and reducing noise.

[0028] In one aspect of this application, an indoor air conditioning unit includes: a housing, a heat exchanger, an impeller, a volute tongue, and a volute casing; the volute casing is disposed within the housing; the volute tongue is disposed within the housing and forms an air inlet duct with the housing, the volute tongue and the volute casing are connected to form an impeller mounting cavity and an air outlet duct; the impeller is disposed in the impeller mounting cavity and located between the air inlet duct and the air outlet duct.

[0029] Driven by the impeller, air flows sequentially through the air inlet duct and the impeller mounting cavity to form the outlet airflow. The outlet airflow includes the return airflow that flows to the impeller after being guided and diverted by the volute tongue, and the outlet airflow that flows to the air outlet duct. The outlet airflow exchanges heat with the heat exchanger.

[0030] The volute tongue includes: an air inlet guide surface that forms an air inlet duct with the casing; a windward surface of the volute tongue that faces the impeller, and the gap between the windward surface of the volute tongue and the outer circumferential surface of the impeller forms a gap flow channel, which is used to guide the return airflow; an air outlet surface of the volute tongue that forms an air outlet duct with the volute casing; and a tongue tip surface that connects the windward surface of the volute tongue and the air outlet surface of the volute tongue.

[0031] The tip of the volute tongue includes: an airflow front surface for guiding the airflow to the airflow duct; and a return airflow front surface, which connects the airflow front surface and the volute tongue front surface to guide a portion of the return airflow on the return airflow front surface to the gap channel.

[0032] The volute tongue is equipped with a flow channel that connects the upstream side of the gap channel to the gap channel; the upstream side of the gap channel is close to the windward side of the return airflow.

[0033] When the impeller rotates, part of the return airflow flows directly into the gap channel, and part of the return airflow flows into the gap channel through the guide channel.

[0034] In this technical solution, the flow diversion channel can divert part of the backflow to the impeller side to the gap flow channel. On the one hand, it can reduce the backflow volume that forms eccentric vortices, thereby reducing the area of ​​eccentric vortices, increasing the effective working area at the impeller, and improving the pressure resistance of the cross-flow fan. On the other hand, the flow diversion channel sends the airflow to the gap flow channel, which can form an impact interception of the backflow in the gap, thereby further controlling the eccentric vortex and improving the pressure resistance of the cross-flow fan. Attached Figure Description

[0035] Figure 1 A cross-sectional view of the indoor unit of the air conditioner is shown;

[0036] Figure 2 It shows Figure 1 Cross-sectional view of the central stroke duct assembly;

[0037] Figure 3 It shows Figure 1 Schematic diagram of airflow direction at the middle impeller;

[0038] Figure 4 It shows Figure 1 A schematic diagram of the airflow direction in the middle section;

[0039] Figure 5 It shows Figure 4 A schematic diagram of the cochlear tongue in the EE direction;

[0040] Figure 6 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 1 ;

[0041] Figure 7 and Figure 8 It shows Figure 6 A magnified view along the X-axis;

[0042] Figure 9 It shows Figure 6 A schematic diagram of the cochlear tongue;

[0043] Figure 10 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 2 ;

[0044] Figure 11 It shows Figure 10 A magnified view in the Y direction;

[0045] Figure 12 It shows Figure 10 Schematic diagram of the impeller and volute tongue;

[0046] Figure 13 It shows Figure 10 Schematic diagram of the cochlear tongue in some embodiments;

[0047] Figure 14 It shows Figure 10 Schematic diagrams of the cochlear tongue in other embodiments;

[0048] Figure 15 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 3 ;

[0049] Figure 16 It shows Figure 15 A magnified view along the Z-axis;

[0050] Figure 17 A schematic diagram is shown when the windward side of the volute tongue is concave.

[0051] Figure 18 It shows Figure 15 Schematic diagram of the cochlear tongue in some embodiments;

[0052] Figure 19 It shows Figure 15 Schematic diagrams of the cochlear tongue in other embodiments;

[0053] Figure 20 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 4 ;

[0054] Figure 21 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 5 ;

[0055] Figure 22 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 6 ;

[0056] Figure 23 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 7 ;

[0057] Figure 24 It shows Figure 23 A magnified view of the P-axis;

[0058] Figure 25 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 8 ;

[0059] Figure 26 The diagram shows the linearity of work done before and after the air diversion channel is installed in the indoor unit of the air conditioner;

[0060] Figure 27 A simulation diagram of the airflow velocity at the drainage channel in the related technology is shown;

[0061] Figure 28 A schematic diagram of the airflow direction at the drainage channel in the related technology is shown;

[0062] Figure 29 The simulation diagram of airflow velocity before the flow channel is installed in the cross-flow fan is shown;

[0063] Figure 30 A simulation diagram of the airflow velocity after setting the diversion channel in a cross-flow fan according to some embodiments is shown;

[0064] Figure 31 A simulation diagram of the airflow velocity after the flow channel is set in a cross-flow fan according to some other embodiments is shown. Detailed Implementation

[0065] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0066] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0067] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0068] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0069] The indoor air conditioning unit described in this application is applicable to ducted air conditioners, as well as wall-mounted and floor-standing units. The following detailed description primarily uses ducted air conditioners as an example:

[0070] Reference Figure 1 and Figure 2 The indoor unit of the air conditioner includes a housing 10, which forms the appearance of the indoor unit; and a cross-flow fan 30, which is located inside the housing 10 and is used to drive the airflow.

[0071] The cross-flow fan 30 includes an impeller 31. The impeller 31 is a multi-bladed, long cylindrical shape with forward-curved multi-bladed blades. When the impeller 31 rotates, the airflow enters the blade cascade from the open part of the impeller 31, passes through the interior of the impeller 31, and is discharged from the other side of the blade cascade, forming the working airflow.

[0072] The impeller 31 can be made of plastic and is injection molded.

[0073] The cross-flow fan 30 includes a cross-flow duct assembly 32. The internal space enclosed by the cross-flow duct assembly 32 forms the fan duct, which is the flow space for airflow when the impeller 31 is working.

[0074] The fan duct includes an inlet duct 32a, an impeller mounting cavity 32b, and an outlet duct 32c, which are connected sequentially along the airflow direction.

[0075] In some embodiments, the indoor unit of the air conditioner may include a heat exchange duct assembly. The heat exchange duct assembly and the cross-flow duct assembly 32 constitute the duct assembly of the indoor unit of the air conditioner.

[0076] The internal space of the heat exchange duct assembly forms a heat exchange chamber 21a, which is connected downstream of the outlet air duct 32c.

[0077] In some embodiments, an air inlet 101 may be formed by opening a portion of the bottom of the housing 10. An air outlet 103 may be formed by opening at least a portion of the side of the housing 10.

[0078] The air inlet 101 is connected to the air inlet end of the air inlet duct 32a. Indoor air is introduced through the air inlet 101. An air inlet grille 102 can be installed at the air inlet 101 to prevent the introduction of foreign objects.

[0079] The air outlet 103 is connected to the heat exchange chamber 21a. The airflow passing through the heat exchange chamber 21a is discharged into the indoor space through the air outlet 103.

[0080] A duct can be connected to the air outlet 103, and the end of the duct away from the air outlet 103 can extend into the indoor space. An air outlet flange for connecting to the duct can be installed at the air outlet 103.

[0081] In some embodiments, the cross-flow duct assembly 32 includes a volute 321. The volute 321 includes an arc-shaped air chamber plate 331 and a diffuser top plate 332 connected to the air chamber plate 331.

[0082] Projecting onto a plane perpendicular to the axis of impeller 31, the arrangement direction of the air inlet duct 32a and the impeller mounting cavity 32b is defined as the second direction. In the figure, the second direction is also the height direction. The first direction is perpendicular to the second direction and the axis of impeller 31. The X-axis is parallel to the first direction and passes through the axis O of impeller 31.

[0083] Along the direction of airflow, the distance from the air chamber plate 331 to the axis O of the impeller 31 gradually increases.

[0084] The diffuser top plate 332 can be generally flat, and it is tangentially connected to the air cavity plate 331. The diffuser top plate 332 and the air cavity plate 331 can be integrally formed.

[0085] In some embodiments, the diffuser top plate 332 may also be an arc-shaped plate that is close to a flat plate, or the diffuser top plate 332 may be a combination of an arc-shaped plate and a flat plate.

[0086] In some embodiments, the cross-flow duct assembly 32 includes a volute 322. The volute 322 includes an air inlet guide 36.

[0087] The housing 10 may include an air inlet duct wall 11. The air inlet duct wall 11 and the air inlet guide 36 are spaced apart along a first direction, and the space between them forms an air inlet duct 32a.

[0088] The air inlet guide 36 is used to define one side wall of the air inlet duct 32a, and the air inlet duct wall 11 is used to define the other side wall of the air inlet duct 32a.

[0089] Specifically, the air intake guide section 36 includes an air intake guide surface 36a facing the air intake duct 32a, and the air intake guide surface 36a and the air intake duct wall 11 form the air intake duct 32a.

[0090] The volute tongue 322 may include a volute tongue windward portion 341 near the impeller 31. The volute tongue windward portion 341 and the air cavity plate 331 of the volute casing 321 form an impeller mounting cavity 32b. The impeller 31 is mounted in the impeller mounting cavity 32b.

[0091] The windward section 341 of the volute tongue is the part of the volute tongue 322 that is closer to the impeller 31. The windward section 341 of the volute tongue is opposite to the impeller 31.

[0092] The volute tongue air intake portion 341 is connected to the air intake guide portion 36, and the two can be integrally formed. The air intake guide portion 36 extends away from the impeller 31, starting from the end connected to the volute tongue air intake portion 341.

[0093] The volute tongue windward section 341 and the air inlet guide section 36 can be connected by an arc transition, which is conducive to the flow of air.

[0094] The volute tongue windward portion 341 includes a volute tongue windward surface 341a connected to the air inlet guide surface 36a.

[0095] The volute tongue 322 may include a volute tongue air outlet 342, which is opposite to the diffuser top plate 332. The volute tongue air outlet 342 and the diffuser top plate 332 cooperate to form an air outlet duct 32c.

[0096] Specifically, the volute tongue air outlet 342 includes a volute tongue air outlet surface 342a. The volute tongue air outlet surface 342a and the diffuser top plate 332 form an air outlet duct 32c.

[0097] The volute tongue 322 may include the tip 343 of the volute tongue. The part of the volute tongue 322 that connects the windward part 341 and the air outlet part 342 of the volute tongue is the tip 343 of the volute tongue.

[0098] The tip of the volute tongue 343 includes the tip surface 343a of the volute tongue, which is connected between the windward surface 341a and the windward surface 342a of the volute tongue.

[0099] In some embodiments, the tip 343 of the volute tongue may be arc-shaped. Since the extension line of the volute tongue windward portion 341 and the extension line of the volute tongue air outlet portion 342 intersect at an acute angle, the tip 343 of the volute tongue connects the volute tongue windward portion 341 and the volute tongue air outlet portion 342, allowing for a smooth connection between the two.

[0100] In the vertical direction, the tip of the volute tongue 343 is higher than the axis O of the impeller 31, and the tip of the volute tongue 343 has a predetermined vertical distance from the axis O of the impeller 31.

[0101] The heat exchange duct assembly includes a heat exchange chamber top plate 211 and a water receiving tray 212. The heat exchange chamber top plate 211 and the water receiving tray 212 cooperate to form a heat exchange chamber 21a.

[0102] The heat exchange chamber top plate 211 can be integrally formed with the shell 10. The water receiving tray 212 can be integrally formed with the shell 10.

[0103] In some embodiments, the volute air outlet 342 may be connected to the end of the water receiving tray 212 near the impeller 31.

[0104] The side plate of the water receiving tray 212 located on the windward side of the heat exchanger 20 is called the air inlet side baffle 2121. The volute tongue air outlet 342 can be connected to the top of the air inlet side baffle 2121.

[0105] In some embodiments, the volute air outlet 342 may be integrally formed with the water receiving tray 212.

[0106] In some embodiments, the duct assembly may include duct side plates. A third direction is defined as parallel to the axis of the impeller 31, and the duct side plates are located at both ends of the third direction of the fan duct. The duct side plates are located at both ends of the third direction of the heat exchange chamber 21a, thereby enclosing both sides of the fan duct and the heat exchange chamber 21a in the third direction.

[0107] One part of the duct side plate is the side wall of the cross-flow duct assembly 32, and the other part of the duct side plate is the side wall of the heat exchange duct assembly.

[0108] The cross-flow fan 30 may include a motor, which serves as the power source for the impeller 31, and its output shaft is connected to the impeller 31.

[0109] The motor can be located at the axial end of the impeller 31. When the motor is working, it provides rotational driving force to the impeller 31, causing the impeller 31 to rotate, thereby driving the airflow.

[0110] The indoor unit of the air conditioner includes a heat exchanger 20, which is disposed within a heat exchange chamber 21a. The heat exchanger 20 is used to absorb heat from the airflow introduced into the heat exchange chamber 21a or to transfer heat to the airflow.

[0111] The heat exchanger 20 may include refrigerant pipes through which refrigerant flows and heat exchange fins connected to the refrigerant pipes to increase the heat exchange area. The heat exchanger 20 may be located on the outlet side of the cross-flow fan 30.

[0112] The water collection tray 212 is located below the heat exchanger 20 and is used to collect the condensate generated on the heat exchanger 20.

[0113] When the indoor unit of the air conditioner is running, if the surface temperature of the heat exchanger 20 is lower than the dew point temperature of the surrounding air or the humidity in the air is high, water vapor will form condensate on the surface of the heat exchanger 20. The condensate will flow downward under the action of gravity and flow into the water collection pan 212.

[0114] The drip tray 212 is connected to the drain pipe located outside the indoor unit of the air conditioner to drain the condensate through the drain pipe.

[0115] Reference Figure 3 and Figure 4 The impeller 31 drives the airflow through the air inlet duct 32a and the impeller mounting cavity 32b to form the outlet airflow.

[0116] The airflow within the impeller 31 is complex, and the airflow velocity field is unstable. A vortex, or eccentric vortex 60, exists near the volute tongue 322 within the impeller 31. Outside the eccentric vortex, the airflow streamlines within the impeller 31 are arc-shaped; this portion of the airflow can be referred to as the cross-flow airflow 62. The cross-flow airflow 62 flows from the impeller 31 to the outlet air duct 32c, becoming the outlet airflow 63, and is ultimately delivered into the room.

[0117] That is, the impeller 31 has a forced vortex-shaped eccentric vortex 60 near the volute tongue 322, and a free vortex-shaped cross-flow 62 away from the volute tongue 322. The airflow inside the impeller 31 can be divided into two parts: one part is the effective air intake, and the other part is the flow participating in the eccentric vortex circulation.

[0118] Therefore, the outlet airflow of impeller 31 includes the outlet airflow 63 flowing towards the outlet airflow duct 32c, and the return airflow flowing back to impeller 31.

[0119] The gap between the windward surface 341a of the volute tongue windward section 341 and the outer peripheral surface of the impeller 31 forms a gap flow channel 30a.

[0120] A portion of the recirculating airflow returns directly to the impeller 31, while another portion returns to the impeller 31 through the gap channel 30a. In this application, the recirculation flowing into the gap channel 30a is also referred to as gap recirculation.

[0121] The position of the eccentric vortex has a significant impact on the performance of the cross-flow fan 30. When the center of the eccentric vortex is close to the volute tongue 322, the fan performance is better. When the center of the eccentric vortex is far away from the volute tongue 322, the area of ​​the eccentric vortex increases, the fan efficiency decreases, and the instability of the flow increases.

[0122] As the back pressure increases, the area entrained by the eccentric vortex increases, the vortex intensifies, and the effective flow area inside the impeller 31 decreases. When the back pressure rises, the center of the eccentric vortex moves from the region near the volute tongue towards the volute 321 in a direction opposite to the rotation direction of the impeller 31, and the center of the eccentric vortex gradually moves away from the volute tongue 322.

[0123] To improve the performance of the cross-flow fan 30 under high back pressure conditions, in some embodiments, reference is made to... Figures 6 to 25 The volute tongue 322 is provided with a flow channel 50, which is used to draw out part of the backflow generated by the impeller 31 to reduce the airflow flow that forms the eccentric vortex, thereby reducing the entrainment area of ​​the eccentric vortex and allowing the center of the eccentric vortex to move closer to the volute tongue 322. With the entrainment area of ​​the eccentric vortex reduced, the effective cross-flow area at the impeller 31 is expanded, thereby increasing the effective airflow of the cross-flow fan 30 and improving the stability of the airflow.

[0124] As back pressure increases, the velocity of the backflow at the gap flow channel 30a increases, and the impact between the backflow and the volute tongue 322 becomes more intense, leading to increased noise in the cross-flow fan 30. In this application, by diverting part of the backflow through the diversion channel 50, the gap backflow is reduced, which in turn reduces the impact force between the gap backflow and the volute tongue 322, thus lowering the noise of the cross-flow fan 30.

[0125] Reference Figure 26 The position where the impeller 31 intersects the positive X-axis on its circumference is 0°, forming a 360° angular distribution in a clockwise direction. The horizontal axis represents the circumferential angle of the impeller 31, and the vertical axis represents the work capacity. The dashed line S represents the work line of the impeller without a flow channel, and the solid line T represents the work line of the impeller after the flow channel of this application is set. Observing from the horizontal axis of the figure, the left end of the solid line T is located to the left of the dashed line S, and the right end of the solid line T is located to the right of the dashed line S, indicating that the work area of ​​the impeller 31 is expanded after the flow channel is set. Observing from the vertical axis of the figure, when the horizontal axis is the same, the solid line T is located above the dashed line S, indicating that the work capacity of the impeller 31 is improved after the flow channel is set.

[0126] Therefore, this application provides a flow channel 50 at the volute tongue 322, so that when the return airflow generated by the impeller 31 comes into contact with the volute tongue, at least part of the airflow that was originally carried to the eccentric vortex changes its flow path and flows into the flow channel 50. As the airflow in the eccentric vortex region decreases, the eccentric vortex contracts, the effective working area inside the impeller 31 expands, and the degree of work done increases, which greatly improves the performance of the cross-flow fan.

[0127] Furthermore, related technologies direct a portion of the outlet airflow towards the gap channel, attempting to impact and intercept the airflow within the gap channel, or direct a portion of the outlet airflow towards the edge of the eccentric vortex to control it. The outlet airflow represents the effective air volume of the air conditioner's indoor unit, and related technologies using outlet airflow to control the eccentric vortex reduce the effective air volume of the indoor unit. This application, however, guides and diverts the return airflow from the source of the eccentric vortex, without sacrificing effective air volume, and also provides a better improvement in the pressure resistance of the cross-flow fan.

[0128] The following is a description of the drainage inlet 51 of the drainage channel 50:

[0129] The inventors of this application discovered during their research that there are points with a velocity of 0 or close to 0 in the low-speed airflow region near the tip surface 343a of the volute tongue. The line connecting these points is defined as the velocity cutoff line Co. (Refer to...) Figure 4 and Figure 5 On the side of the velocity cutoff line Co away from the impeller 31 (to the right of the velocity cutoff line Co in the diagram), the outlet airflow flows towards the outlet side; on the side of the velocity cutoff line Co closer to the impeller 31 (to the left of the velocity cutoff line Co in the diagram), the return airflow flows towards the impeller 31. In other words, the outlet airflow at the tip of the volute tongue 343 is split under the guidance of the volute tongue tip surface 343a, with one part flowing to the left towards the gap channel 30a and the other part flowing to the right towards the outlet airflow channel 32c. The velocity cutoff line Co lies between these two airflow components.

[0130] In some embodiments, the flow inlet 51 is provided on the tip surface 342a of the volute tongue 322, and a portion of the flow inlet 51 is located on the side of the velocity cutoff line Co closer to the impeller 31.

[0131] In this way, it can be ensured that the airflow flowing into the diversion channel 50 will inevitably have a return airflow, reducing the return flow at the impeller 31, and diverting part of the airflow that originally formed the eccentric vortex. This can limit the area of ​​the eccentric vortex and avoid the problem that the eccentric vortex area is large and the effective cross-flow area is small under high back pressure conditions, thereby improving the pressure resistance of the cross-flow fan 30.

[0132] In some embodiments, the flow inlet 51 is located on the tip surface 342a of the volute tongue 322, and all of the flow inlets 51 are located on the side of the velocity cutoff line Co closer to the impeller 31. In this way, it can be ensured that the airflow entering the flow channel 50 is all return airflow and there is no outlet airflow.

[0133] In some embodiments, refer to Figure 6 and Figure 7In the cross section of the cross-flow fan perpendicular to the axis of impeller 31, the radius of impeller 31 is R; in the radial direction of impeller 31, the minimum distance from impeller 31 to the windward face 341a of volute tongue is W0; and the minimum width of the flow channel 50 is W2.

[0134] The distance from the velocity cutoff line Co to the impeller shaft center O is greater than (R+W0+2W2). The circle drawn with the impeller shaft center O as the center and (R+W0+2W2) as the radius is the dividing circle C. The velocity cutoff line Co is located outside the dividing circle C.

[0135] The distance from the inlet 51 of the inlet channel 50 to the axis O of the impeller 31 is L, where L ∈ R + W0 + 2W2, which ensures that all the airflow entering the inlet 50 is a return flow.

[0136] Continue to refer to Figure 4 and Figure 5 The outlet airflow at the tip surface 343a of the volute tongue is guided and diverted by the tip surface 343a of the volute tongue to form a return airflow flowing towards the impeller 31 and an outlet airflow flowing towards the outlet duct 32c.

[0137] The tip surface 343a of the volute tongue includes a return airflow windward surface 343b. The return airflow windward surface 343b is connected to the volute tongue windward surface 341a. The return airflow windward surface 343b is used to guide the return airflow on it to the gap channel 30a.

[0138] The tip surface 343a of the volute tongue includes an airflow facing surface 343c. The airflow facing surface 343c connects the return airflow facing surface 343b and the volute tongue outlet surface 342a. The airflow facing surface 343c guides the airflow on it to the outlet duct 32c.

[0139] The return airflow front side 343b is located on the side of the velocity cutoff line Co closer to the impeller 31, while the outlet airflow front side 343c is located on the side of the velocity cutoff line Co away from the impeller 31.

[0140] In some embodiments, refer to Figures 6 to 14 The inlet 51 of the diversion channel 50 can be located on the windward side 343b of the return airflow, and the inlet 51 is located on the upstream side 30b of the gap channel 30a (refer to the reference). Figure 3 The return airflow will enter the diversion channel 50 through the diversion inlet 51 before flowing to the gap channel 30a, thereby reducing the eccentric vortex flow, causing the eccentric vortex region to shrink, expanding the effective working area of ​​the impeller 31, and improving the air volume and pressure resistance of the cross-flow fan 30.

[0141] Inside the fan duct, the space near the windward side 343b of the return airflow is the upstream side 30b of the gap channel 30a. The return airflow first passes through the upstream side of the gap channel 30a and then flows to the gap channel 30a.

[0142] Specific reference Figure 7 In the cross-sectional area of ​​the cross-flow fan perpendicular to the axis of the impeller 31, the end connecting the windward face 341a of the volute tongue and the tip face 343a of the volute tongue is denoted as U. In the radial direction of the impeller 31, the distance between the impeller 31 and U is W1, and the distance L from the inlet 51 to the axis O of the impeller 31 satisfies: R + W1 ≤ L. This ensures that the entire inlet 51 is connected to the upstream side 30b of the gap channel 30a, and the airflow entering the inlet 51 is the return airflow before it flows to the gap channel 30a.

[0143] Combined with reference Figure 3 Part of the return airflow returns directly to the impeller 31 to form an eccentric vortex cycle, while the other part of the return airflow flows to the gap channel 30a and from the gap channel 30a to the impeller 31, forming an eccentric vortex cycle.

[0144] In this embodiment, the inlet 51 is located on the windward side 343b of the return airflow, so that the inlet 51 is located upstream of the gap channel 30a. This can reduce the backflow directly returning to the impeller 31 and the backflow flowing to the gap channel 30a, reduce the flow rate of the two parts of the airflow that form the eccentric vortex, and cause the eccentric vortex region to shrink, thereby expanding the effective working area of ​​the impeller 31.

[0145] In some embodiments, continue to refer to Figure 7 One side wall of the flow channel 50 is connected to the windward surface 341a of the volute tongue at the flow inlet 51 via a first arc surface 391, and the other side wall of the flow channel 50 is connected to the air outlet surface 342a of the volute tongue at the flow inlet 51 via a second arc surface 392.

[0146] In some embodiments, refer to Figure 8 and Figure 11 On the cross section of the cross-flow fan 30 perpendicular to its axis, the direction Lp1 of the flow channel 50 toward the inside of the flow channel at the flow inlet 51 is parallel to the tangent of the volute tongue windward surface 341a at point U, or the angle between the two is α1.

[0147] α1 is an acute angle, which makes the angle between the inlet of the flow channel 50 and the windward surface 341a of the volute tongue relatively small, thus making the resistance of the airflow flowing into the flow channel 50 through the flow inlet 51 relatively small, which is conducive to the flow of airflow into the flow channel 50.

[0148] If α1 is an obtuse angle, then the angle between the inlet of the drainage channel 50 and the windward surface 341a of the volute tongue is relatively large. The airflow needs to make a large turning angle to flow into the drainage channel 50, which will increase the resistance of the airflow entering the drainage channel 50, thereby weakening the effect of the drainage channel 50 in guiding the return airflow.

[0149] In some embodiments, refer to Figures 15 to 19 The inlet 51 is located on the windward side 341a of the volute tongue. Part of the backflow between the windward side 341 of the volute tongue and the impeller 31 flows through the inlet 51 to the inlet channel 50, which can reduce the flow rate of the backflow in the gap that forms the eccentric vortex, improve the pressure resistance of the cross-flow fan 30, and thus increase the air volume of the cross-flow fan 30.

[0150] The end of the gap flow channel 30a near the tip surface 343a of the volute tongue is the starting end of the gap flow channel 30a, and the end of the gap flow channel 30a near the air inlet guide surface 36a (the end away from the tip surface 343a of the volute tongue) is the tail end of the gap flow channel 30a.

[0151] In some embodiments, the drainage inlet 51 is provided on the windward side 341a of the volute tongue near the tip surface 343a of the volute tongue.

[0152] When the inlet 51 is positioned relatively close to the air inlet guide surface 36a on the windward side 341a of the volute tongue, the energy impact of the backflow has been reduced as it has already flowed to the tail side of the gap flow channel 30a. The backflow will also tend to flow into the impeller 31. If the pressure on the outlet 52 side of the inlet channel 50 is high, backflow of air at the inlet channel 50 can easily occur. That is, the airflow on the outlet 52 side flows through the inlet channel 50 to the gap flow channel 30a, thus rendering the function of the inlet channel 50 in guiding the backflow ineffective. Therefore, the inlet 51 needs to be positioned relatively close to the tip surface 343a of the volute tongue on the windward side 341a of the volute tongue.

[0153] In some embodiments, see specific references. Figure 16 In the cross-section of the cross-flow fan 30 perpendicular to the axis of the impeller 31, the distance from the end of the inlet 51 near the tip surface 343a of the volute tongue to the axis O of the impeller 31 is m1, and the distance from the end of the inlet 51 away from the tip surface 343a of the volute tongue to the axis O of the impeller 31 is m2, where m1 is greater than m2. This allows a portion of the airflow within the gap channel 30a to enter the inlet channel 50 through the inlet 51.

[0154] In some embodiments, the volute tongue's windward surface 341a is an arcuate surface convex toward the impeller 31. On a cross-section of the cross-flow fan 30 perpendicular to the axis of the impeller 31, the position on the volute tongue's windward surface 341a closest to the impeller 31 is denoted as Z1, and the inlet 51 is located between Z1 and Z1. Within this range, it can be ensured that a portion of the airflow within the gap channel 30a can enter the inlet channel 50 through the inlet 51.

[0155] Reference Figure 17 If the volute tongue's windward surface 341a is a concave arc surface that moves away from the impeller 31, the backflow in the gap is more likely to flow along the line connecting the upper and lower ends of the arc surface (the dotted arrow in the figure), and less likely to flow towards the inlet 51.

[0156] In some embodiments, refer to Figure 16 One side wall of the flow channel 50 is connected to the windward surface 341a of the volute tongue at the flow inlet 51 by an arc, and the other side wall of the flow channel 50 is connected to the tip surface 343a of the volute tongue at the flow inlet 51 by an arc, thereby forming a smooth flow channel at the flow inlet 51 and improving the smoothness of the return flow into the flow channel 50.

[0157] In some embodiments, the angle α1 between the drainage channel 50 and the windward surface 341a of the volute tongue at the drainage inlet 51, with the drainage channel facing inward Lp1, is less than 90°. The inlet portion of the drainage channel 50 extends obliquely downward from the drainage inlet 51, which ensures that the backflow from the gap can enter the drainage channel 50 relatively smoothly, avoiding the problem of high resistance to the backflow from the gap entering the drainage channel 50 when the inlet portion of the drainage channel 50 extends upward.

[0158] In some embodiments, on a cross-flow fan 30 perpendicular to the axis of the impeller 31, a line passing through the end point of the inlet 51 near the tip of the volute tongue 343a and parallel to the first direction is line Lp2.

[0159] The inlet portion of the drainage channel 50 and the tip 343 of the volute tongue are located on opposite sides of line Lp2, that is, the tip surface 343a of the volute tongue is located on the upper side of line Lp2, and the inlet portion of the drainage channel 50 is located on the lower side of line Lp2, so that the inlet portion of the drainage channel 50 tends to extend downward, avoiding the problem of high resistance caused by backflow into the drainage channel 50 when the inlet portion of the drainage channel 50 extends upward.

[0160] In some embodiments, the drainage inlet 51 of the drainage channel 50 is located at the junction of the volute tongue tip surface 343a and the volute tongue windward surface 341a. A portion of the drainage inlet 51 of the drainage channel 50 is located on the volute tongue tip surface 343a, and another portion of the drainage inlet 51 of the drainage channel 50 is located on the volute tongue windward surface 341a.

[0161] In this application, the portion of the volute tongue's windward surface 341a near the tip surface 343a, and the return airflow's windward surface 343b are referred to as the air intake region. The air intake inlet 51 of the air intake channel 50 can be located within the air intake region, thereby allowing a portion of the return airflow to enter the air intake channel 50 through the air intake inlet 51.

[0162] The drainage outlet 52 of the drainage channel 50 is described below:

[0163] In some embodiments, refer to Figures 6 to 8 The drainage outlet 52 of the drainage channel 50 is located on the windward side 341a of the volute tongue.

[0164] The outlet airflow of the diversion channel 50 can impact the backflow in the gap, thereby intercepting the backflow in the gap. The flow velocity of the backflow in the gap is reduced, and even part of the backflow in the gap can end the circulation stroke, which causes the entrainment area of ​​the eccentric vortex to shrink, thereby increasing the cross-flow area at the impeller 31 and improving the fan efficiency and effective airflow.

[0165] In some embodiments, the drainage outlet 52 is disposed on the windward side 341a of the volute tongue and close to the air inlet guide surface 36a. A side wall defining the drainage channel 50 is connected to the air inlet guide surface 36a at the drainage outlet 52 by an arc transition.

[0166] The endpoint of the volute tongue's windward face 341a near the outlet 52 is denoted as J. The direction of the airflow flowing outward from the outlet 52 within the drainage channel 50 is represented by the extended direction line Lp3. The angle α3 between the extended direction line Lp3 and the tangent of the volute tongue's windward face 341a at point J is obtuse, which allows the outlet airflow of the drainage channel 50 to impact the tail side of the gap recirculation, thereby improving the effect of the outlet airflow on the control of the eccentric vortex.

[0167] In some embodiments, refer to Figures 10 to 19 The drainage outlet 52 of the drainage channel 50 is located on the air inlet guide surface 36a of the air inlet guide section 36.

[0168] The outlet 52 is open towards the air inlet duct 32a. The outlet 52 is connected to the air inlet duct 32a.

[0169] In this way, the recirculating airflow in the diversion channel 50 can be re-entered into the impeller 31 as part of the intake air.

[0170] Therefore, in this embodiment, the function of the flow channel 50 is to guide part of the return airflow to the air inlet side of the impeller 31, which can reduce the backflow in the gap and increase the air inlet volume.

[0171] In some embodiments, the drainage outlet 52 is located on the air inlet guide surface 36a and is positioned relatively close to the windward surface 341a of the volute tongue.

[0172] The airflow exiting the diversion channel 50 first flows to the air inlet duct 32a, and then is drawn into the impeller 31. On the one hand, the diverted airflow can impact the edge of the eccentric vortex, thereby effectively controlling the eccentric vortex and further improving the pressure resistance of the cross-flow fan; on the other hand, it can improve the air intake efficiency of the cross-flow fan 30.

[0173] In some embodiments, refer to Figure 12 On the cross-section of the cross-flow fan 30 perpendicular to the axis of the impeller 31, a tangent n4 is drawn from the end of the inlet outlet 52 furthest from the gap channel 30a towards the outer periphery of the impeller 31. The angle between n4 and the X-axis is θ, which is 40°. Within this range, it can be ensured that the inlet airflow can impact the edge of the eccentric vortex, and the intake airflow of the inlet duct 32a can also be improved.

[0174] If θ < 40°, the distance between the outlet 52 and the gap channel 30a will be relatively far. The airflow from the outlet 52 cannot affect the eccentric vortex and can only improve the intake efficiency.

[0175] The location of the outlet 52 on the windward side 341a of the volute tongue and the air inlet guide surface 36a are both the air outlet area.

[0176] In some embodiments, refer to Figure 20 There is a gap between the lower part of the heat exchanger 20 and the air inlet side baffle 2121, so that the airflow driven by the impeller 31 can flow from the gap to the lower part of the heat exchanger 20, ensuring that the lower part of the heat exchanger 20 can also play a heat exchange role.

[0177] For ease of description, this application refers to the space within the water receiving pan 212 located on the windward side of the heat exchanger 20 as the windward space 2122. The airflow driven by the impeller 31 blows directly to the upper middle part of the heat exchanger 20; the outlet airflow spreads to the surroundings and gradually flows through the windward space 2122 to the lower part of the heat exchanger 20.

[0178] The outlet 52 of the flow channel 50 is located on the baffle plate 2121 on the air inlet side, so that the flow channel 50 is connected to the internal space of the water receiving tray 212. The outlet airflow of the flow channel 50 flows to the lower part of the heat exchanger 20.

[0179] In this embodiment, the airflow of the diversion channel 50 flows to the heat exchanger 20, which can increase the air volume of the cross-flow fan 30.

[0180] The windward space 2122 is located below the extension line of the volute tongue outlet surface 342a. Airflow in this area is poor, easily generating vortices and turbulence, resulting in a relatively small airflow through the lower part of the heat exchanger 20, preventing the lower part of the heat exchanger 20 from fully utilizing its heat exchange function. This application addresses this by placing the drainage outlet 52 on the inlet-side baffle plate 2121, allowing the drainage channel 50 to directly connect with the windward space 2122 of the water receiving tray 212. This increases the airflow in the windward space 2122, enabling more airflow to pass through the lower part of the heat exchanger 20 for heat exchange, thus fully utilizing the heat exchange performance of the lower part of the heat exchanger 20.

[0181] In some embodiments, the portion of the heat exchanger 20 located within the water receiving pan 212 constitutes the lower part of the heat exchanger 20.

[0182] The outlet 52 faces the lower part of the heat exchanger 20. The extended line Lp3 of the outlet channel 50 intersects the lower part of the heat exchanger 20. In this way, the gas flowing out of the outlet 52 can be blown to the lower part of the heat exchanger 20 with a shorter path.

[0183] In some embodiments, the outlet 52 faces the bottom wall of the air-facing space 2122. The directional extension line Lp3 of the outlet channel 50 intersects the bottom wall of the air-facing space 2122. In this way, the gas flowing out of the outlet 52 will be blown towards the bottom of the air-facing space 2122 and then continue to spread towards the lower part of the heat exchanger 20.

[0184] The following is a description of drainage channel 50:

[0185] In some embodiments, refer to Figure 11 The width of the gap flow channel 30a is W3, and the width of the diversion channel 50 is W2. The difference between W2 and W3 ensures that the diversion channel 50 draws out part of the return airflow, thereby ensuring the influence of the diversion channel 50 on the eccentric vortex. This causes the entrainment area of ​​the eccentric vortex to shrink and the cross-flow area at the impeller 31 to expand, thereby improving the performance of the cross-flow fan.

[0186] If W2 < 0.5W3, then the width of the drainage channel 50 is relatively narrow, which may result in the drainage channel 50 failing to draw out enough return airflow, thus limiting its ability to improve the performance of the cross-flow fan.

[0187] In some embodiments, W2 ≤ 2W3. If W2 > 2W3, the drainage channel 50 is much wider than the gap channel 30a. Since the drainage flow rate of the drainage channel 50 has an upper limit, it cannot allow all the return airflow to flow into the drainage channel 50. Therefore, if the drainage channel 50 is too large, it will waste its capacity and greatly reduce the structural strength of the volute tongue 322.

[0188] 0.5W3 ≤ W2 ≤ 2W3. This can ensure that the drainage channel 50 can improve the compressive resistance of the cross-flow fan and will not have a great impact on the structural strength of the volute tongue 322.

[0189] In some embodiments, 0.6W3 ≤ W2 ≤ 0.8W3. When the widths of the drainage channel 50 and the gap flow channel 30a are within this relationship range, the drainage channel 50 can achieve the effect of improving the compressive performance of the cross-flow fan, meet the air output volume of the air conditioner indoor unit under various working conditions, and enable the structural strength of the volute tongue 322 to meet the usage requirements.

[0190] In some embodiments, the width W2 of the drainage channel 50 is 3 - 4 mm. The width W3 of the gap flow channel 30a is 5 mm - 6 mm. W3 and W2 represent the minimum widths.

[0191] In other embodiments, W3 and W2 can be the average widths; or W3 and W2 can be the maximum widths.

[0192] In some embodiments, in a cross-section perpendicular to the axis of the impeller 31 of the cross-flow fan 30, the shape of the drainage channel 50 can be linear, arc-shaped, "V"-shaped, "L"-shaped or meandering.

[0193] In this application, as long as the drainage inlet 51 of the drainage channel 50 is arranged in the drainage intake area, the position of the drainage outlet 52 can be arbitrarily selected, and the structural form is diverse, which can meet the requirements of different situations.

[0194] The following introduces the first embodiment of the drainage channel 50:

[0195] In some embodiments, referring to Figure 6 and Figure 7 , the drainage channel 50 connects the upstream side 30b of the gap flow channel 30a to the gap flow channel 30a.

[0196] The drainage inlet 51 of the drainage channel 50 is arranged on the upstream windward surface 343b of the return air flow. The drainage channel 50 extends from the drainage inlet 51 to the gap flow channel 30a. The drainage channel 50 is used to guide a part of the return air flow on the upstream windward surface 343b of the return air flow to flow into the gap flow channel 30a.

[0197] When the impeller 31 operates, a part of the return air flow directly flows into the gap flow channel 30a, and a part of the return air flow flows into the drainage channel 50 and then flows to the gap flow channel 30a.

[0198] In this embodiment, the diversion channel 50 can first draw out a portion of the return airflow and then send it to the gap flow channel 30a. By diverting the return airflow through the diversion channel 50, the airflow that normally forms the eccentric vortex circulation can be reduced, causing the area where the eccentric vortex is located to shrink and the cross-flow area at the impeller 31 to expand, thereby increasing the air volume of the cross-flow fan 30 and improving the pressure resistance of the cross-flow fan 30.

[0199] In addition, the airflow from the diversion channel 50 to the gap flow channel 30a can impact the backflow in the gap flow channel 30a, thereby controlling the eccentric vortex and further improving the efficiency of the cross-flow fan 30.

[0200] In some embodiments, the drain outlet 52 is located on the windward side 341a of the volute tongue. The drain outlet 52 is connected to the gap channel 30a.

[0201] In some embodiments, the flow outlet 52 is located at one end of the volute tongue windward surface 341a near the air inlet guide surface 36a. The flow outlet 52 is connected to the tail end of the gap flow channel 30a. The airflow flowing out of the flow channel 50 can impact the tail side of the gap return flow, thereby changing the flow direction of the gap return flow. The gap return flow enters the internal circulation of the impeller 31 earlier from the circumferential motion, which further shrinks the eccentric vortex region at the impeller 31 and further improves the efficiency of the cross-flow fan 30.

[0202] Reference Figure 27 and Figure 28 Most related technologies involve sending a portion of the airflow from the outlet duct to the gap flow channel. This portion of the airflow impacts and blocks the backflow in the gap, thereby controlling the eccentric vortex and improving the pressure resistance of the cross-flow fan.

[0203] After the diverted airflow exits the outlet, it is simultaneously impacted by the backflow from the interception gap. Under this impact, the diverted outlet airflow will deflect β towards the inlet side relative to the extended direction line Lp3 of the outlet. That is, the angle between the direction of the diverted outlet airflow and the extended direction line Lp3 of the diverted outlet is β.

[0204] Because of the guiding effect of the drainage channel 50 on the return flow in this application, the flow rate of the gap return flow is reduced, thereby reducing the impact of the gap return flow on the airflow at the drainage outlet. Therefore, the flow direction of the airflow at the drainage outlet in this application does not deviate relative to the extended line Lp3 of the outlet orientation, or its deviation angle is smaller than that of related technologies. Figure 28 The deflection angle β of the outlet airflow of the axial flow fan 30 is smaller than that of the eccentric vortex in the related technology, and thus the eccentric vortex region of the axial flow fan 30 is smaller, resulting in a better improvement in the pressure resistance performance of the axial flow fan 30.

[0205] In some embodiments, refer to Figure 7 The drainage channel 50 can be composed of multiple connected segments.

[0206] The drainage channel 50 may include a first drainage segment 541. The first drainage segment 541 is connected to the drainage inlet 51. The first drainage segment 541 may be a straight segment or an arc segment.

[0207] The first flow-inlet segment 541 extends gradually downward from the flow-inlet 51 and away from the impeller 31.

[0208] The drainage channel 50 may include a second drainage segment 542. The second drainage segment 542 is connected to the drainage outlet 52. The second drainage segment 542 may be a straight segment or an arc segment.

[0209] The second drainage section 542 extends upward from the drainage outlet 52 and in a direction away from the impeller 31.

[0210] The first drainage segment 541 and the second drainage segment 542 are connected by an arc segment.

[0211] The angle formed by the first diversion segment 541 and the second diversion segment 542 is not less than 90°, so that the turning angle on the diversion channel 50 is relatively large, avoiding the increase of airflow resistance in the diversion channel 50 due to the turning angle being too small.

[0212] In some embodiments, the drainage channel 50 gradually expands from its inlet 51 to its outlet 52. That is, the width of the drainage channel 50 gradually increases from the inlet 51 to the outlet 52. This gradual slowing of the airflow within the drainage channel 50 reduces the impact of the airflow exiting the outlet 52 on the impeller 31, thereby reducing noise. The gradual change in the drainage channel 50 also makes its various parts smoother, allowing the airflow to flow smoothly within it.

[0213] In some embodiments, refer to Figure 9 The volute tongue 322 may include the bottom shell body 431.

[0214] The bottom shell body 431 has a recessed portion near the volute tongue 322, which is recessed away from the impeller 31. The side of the bottom shell body 431 where the recessed portion is formed is the first flow guide wall surface 531.

[0215] The volute tongue 322 may include a volute tongue splice 432. The volute tongue splice 432 is disposed in the recessed portion, and the volute tongue splice 432 is spaced apart from the bottom shell body 431, the space forming a drainage channel 50. The side of the volute tongue splice 432 facing the first drainage wall 531 is the second drainage wall 532.

[0216] Both ends of the bottom shell body 431 along its length (parallel to the axis of the impeller 31) are connected to the side plates of the air duct. Both ends of the volute tongue splice 432 along its length are connected to the side plates of the air duct.

[0217] In some embodiments, the bottom shell body 431 includes an air inlet guide 36, a first flow channel forming part 4312 and a volute tongue air outlet part 342, and the first flow wall 531 is the side surface on the first flow channel forming part 4312.

[0218] The upper end of the first drainage channel forming part 4312 can be connected to the volute tongue air outlet part 342 through an arc segment.

[0219] The lower end of the first flow channel forming part 4312 can be connected to the air inlet guide part 36 through an arc segment.

[0220] In some embodiments, the volute tongue splice 432 is block-shaped. The side of the volute tongue splice 432 opposite to the second drainage wall surface 532 is the volute tongue windward surface 341a.

[0221] The lower end of the volute tongue's windward surface 341a is connected to the lower end of the second drainage wall surface 532 by an arc. The upper end of the volute tongue's windward surface 341a is connected to the upper end of the second drainage wall surface 532 by an arc.

[0222] The following describes a second embodiment of the drainage channel 50:

[0223] In some embodiments, refer to Figures 10 to 12 The inlet 51 of the diversion channel 50 is located on the windward side 343b of the return airflow. The diversion channel 50 extends from the inlet 51 to the air inlet duct 32a. The diversion channel 50 is used to draw out a portion of the return airflow and then send it to the air inlet duct 32a.

[0224] When the cross-flow fan 30 is running, part of the return airflow flows directly into the gap flow channel 30a; the other part of the return airflow flows into the diversion channel 50 and then flows to the air inlet duct 32a.

[0225] In this embodiment, the diversion channel 50 can draw a portion of the return airflow from the upstream side of the gap flow channel 30a to the input end of the impeller 31. On the one hand, by diverting the return airflow through the diversion channel 50, the airflow entering the gap flow channel 30a can be reduced, thereby causing the eccentric vortex region at the impeller 31 to shrink, thus improving the efficiency of the cross-flow fan. At the same time, due to the reduction of the gap return flow in the gap flow channel 30a, the abnormal noise at the gap flow channel 30a can be significantly reduced. On the other hand, the diversion channel 50 sends the drawn airflow to the air inlet duct 32a, which can supplement the air intake of the impeller 31 and improve the air intake efficiency of the cross-flow fan 30.

[0226] Reference Figure 29 and Figure 30 , Figure 30 After setting up a drainage channel of 50, compared to Figure 29 The eccentric vortex region (Figure I) is effectively contracted, and the cross-flow region at impeller 31 is expanded, thus improving the performance of the cross-flow fan.

[0227] Continue to refer to Figure 29 A large low-pressure vortex is formed on the air intake side of the impeller 31, near the air intake guide section 36 (Figure II), which reduces the air intake effect of the impeller 31.

[0228] Reference Figure 30 This application connects the outlet of the diversion channel 50 to the air inlet duct 32a, which can greatly reduce the area of ​​the low-pressure vortex region, thereby improving the air intake efficiency of the cross-flow fan 30.

[0229] In some embodiments, the drainage outlet 52 of the drainage channel 50 is located on the air inlet guide surface 36a. The drainage outlet 52 is open toward the air inlet duct 32a. The drainage outlet 52 is connected to the air inlet duct 32a.

[0230] In some embodiments, the outlet 52 of the flow channel 50 is located on the air inlet guide surface 36a and relatively close to the windward surface 341a of the volute tongue. The airflow flowing out of the outlet 52 can impact the edge of the eccentric vortex, thereby further controlling the eccentric vortex and improving the pressure resistance of the cross-flow fan 30.

[0231] Because the drainage channel 50 in this application guides the return flow, the flow rate of the gap return flow is reduced, thereby reducing the impact of the gap return flow on the drainage outlet airflow. Therefore, the deflection angle of the drainage outlet airflow in this application is smaller than the deflection angle β of the drainage outlet airflow in the related technology. The region of the eccentric vortex in this application is smaller than the region of the eccentric vortex in the related technology. The drainage channel 50 in this application has a better effect on controlling the eccentric vortex.

[0232] In some embodiments, refer to Figure 11 The drainage channel 50 can be composed of multiple connected segments.

[0233] The drainage channel 50 may include a first drainage segment 541. The first drainage segment 541 is connected to the drainage inlet 51. The first drainage segment 541 may be a straight segment or an arc segment.

[0234] The first flow-inlet segment 541 extends gradually downward from the flow-inlet 51 and away from the impeller 31.

[0235] The drainage channel 50 may include a second drainage segment 542. The second drainage segment 542 is connected to the drainage outlet 52. The second drainage segment 542 may be a straight segment or an arc segment.

[0236] The second drainage section 542 extends upward from the drainage outlet 52 and in a direction away from the impeller 31.

[0237] The first drainage segment 541 and the second drainage segment 542 are connected by an arc segment.

[0238] In some embodiments, the first drainage segment 541 and the second drainage segment 542 are generally "L" shaped, which facilitates manufacturing and reduces processing difficulty.

[0239] In some embodiments, the first diversion segment 541 gradually expands along the airflow direction, which can reduce the airflow velocity. The width of the second diversion segment 542 can remain unchanged. When this portion of the airflow continues to flow through the second diversion segment 542 to the air inlet duct 32a, its impact on the air inlet airflow can be mitigated.

[0240] In other embodiments, the width of the first drainage segment 541 remains constant, while the width of the second drainage segment 542 may vary gradually.

[0241] In some embodiments, the flow channel 50 gradually expands from the flow inlet 51 to the flow outlet 52. That is, the width of the flow channel 50 gradually increases from the flow inlet 51 to the flow outlet 52. In this way, the airflow velocity within the flow channel 50 gradually decreases, which can reduce the impact of the flow of the diverted airflow from the flow outlet 52 on the normal intake airflow of the impeller 31.

[0242] In some embodiments, refer to Figure 13 and Figure 14 The volute tongue 322 includes the bottom shell body component 431.

[0243] The bottom shell body 431 has a recessed portion near the volute tongue 322, which is recessed away from the impeller 31. The side of the bottom shell body 431 where the recessed portion is formed is the first flow guide wall surface 531.

[0244] The volute tongue 322 may include a volute tongue splice 432. The volute tongue splice 432 is disposed in the recessed portion, and the volute tongue splice 432 is spaced apart from the bottom shell body 431, the space forming a drainage channel 50. The side of the volute tongue splice 432 facing the first drainage wall 531 is the second drainage wall 532.

[0245] Both ends of the bottom shell body 431 along its length are connected to the air duct side plates. Both ends of the volute tongue splice 432 along its length are connected to the air duct side plates.

[0246] In some embodiments, the bottom shell body 431 includes a first air inlet guide portion 4311, a first airflow channel forming portion 4312, and a volute tongue air outlet portion 342.

[0247] The first drainage wall 531 is the side surface of the first drainage channel forming part 4312.

[0248] The lower ends of the first air inlet guide section 4311 and the first air diversion channel forming section 4312 are connected by an arc segment. The upper end of the first air diversion channel forming section 4312 is formed with the volute tongue air outlet section 342 by an arc segment.

[0249] In some embodiments, the volute tongue splice 432 may be a solid structure, and the volute tongue splice 432 may be a solid rod.

[0250] The side of the volute tongue connector 432 includes a second air inlet guide surface 4321a, a volute tongue windward surface 341a, and a second drainage wall surface 532. The second air inlet guide surface 4321a forms the upper part of the air inlet guide surface 36a. The volute tongue windward surface 341a and the second drainage wall surface 532 are connected by an arc surface.

[0251] In some embodiments, the volute tongue splice 432 may be hollow, with its interior extending through the longitudinal direction.

[0252] The volute tongue splice 432 includes a second air inlet guide part 4321, a volute tongue windward part 341, and a second drainage channel forming part 4322.

[0253] The lower end of the first air inlet guide part 4321 is connected to the lower end of the second air diversion channel forming part 4322 by an arc segment, and the upper end of the volute tongue air intake part 341 is connected to the upper end of the second air diversion channel forming part 4322 by an arc segment.

[0254] The second drainage wall surface 532 is the side surface of the second drainage channel forming part 4322. The second air inlet guide surface 4321a is the side surface of the second air inlet guide part 4321.

[0255] The first air inlet guide section 4311 and the second air inlet guide section 4321 together form the air inlet guide section 36. The gap between the first air inlet guide section 4311 and the second air inlet guide section 4321 forms the drainage outlet 52 of the drainage channel 50.

[0256] The following describes Example 3 of the drainage channel 50:

[0257] In some embodiments, refer to Figure 15 , Figure 16 The flow channel 50 is located at the volute tongue 322. The flow channel 50 is used to draw out a portion of the gap backflow and then send it to the air inlet duct 32a.

[0258] When the cross-flow fan 30 is running, part of the return airflow that enters the gap flow channel 30a continues to flow within the gap flow channel 30a; the other part of the return airflow that enters the gap flow channel 30a flows into the diversion channel 50 and then flows to the air inlet duct 32a.

[0259] In this embodiment, a portion of the gap backflow within the gap channel 30a flows to the air inlet side of the impeller 31 through the guide channel 50. On one hand, by guiding the gap backflow through the guide channel 50, the airflow rate within the gap channel 30a can be reduced, thereby causing the eccentric vortex region at the impeller 31 to contract, thus improving the efficiency of the cross-flow fan. At the same time, due to the reduction in the flow rate within the gap channel 30a, abnormal noise at the gap channel 30a can be significantly reduced. On the other hand, by sending the gap backflow to the air inlet side of the impeller 31 through the guide channel 50, the air intake of the impeller 31 can be supplemented, improving the air intake efficiency of the cross-flow fan 30.

[0260] Reference Figure 29 and Figure 31 As can be seen from the figure, Figure 31 After setting up a drainage channel of 50, compared to Figure 29 The eccentric vortex region (Figure I) is effectively contracted, and the cross-flow region at impeller 31 is expanded, thus improving the performance of the cross-flow fan.

[0261] This application connects the outlet of the diversion channel 50 to the air inlet duct 32a, which can greatly reduce the area of ​​the low-pressure vortex region (Figure II), thereby improving the air intake efficiency of the cross-flow fan 30.

[0262] In some embodiments, continue to refer to Figure 16 The inlet 51 is located on the windward side 341a of the volute tongue, and the inlet channel 50 extends from the inlet 51 to the air inlet duct 32a to guide part of the gap on the windward side 341a of the volute tongue back to the air inlet duct 32a.

[0263] The inlet 51 can be connected to the beginning of the gap channel 30a, so that the gap backflow is diverted at the beginning of the gap channel 30a.

[0264] In some embodiments, the flow channel 30a is arc-shaped. In a cross-section of the cross-flow fan 30 perpendicular to the axis of the impeller 31, the flow channel 50 is arc-shaped. This improves the smoothness of backflow within the flow channel 50 and reduces airflow resistance within the flow channel 50.

[0265] In some embodiments, the drainage channel 50 includes a first drainage segment 541 and a second drainage segment 542. The first drainage segment 541 is located near the drainage inlet 51, and the second drainage segment 542 is located near the drainage outlet 52.

[0266] The first drainage segment 541 can be arc-shaped, and the second drainage segment 542 can extend along a straight line.

[0267] The angle between the first diversion segment 541 and the second diversion segment 542 is not less than 90°. This can prevent the airflow from making large turns within the diversion channel 50, thereby reducing the flow resistance of the airflow and improving the smoothness of the airflow within the diversion channel 50.

[0268] In some embodiments, the flow channel 50 is gradually expanded from the flow inlet 51 to the flow outlet 52, and the airflow velocity in the flow channel 50 gradually slows down, which can reduce the impact of this part of the airflow on the normal airflow of the impeller 31.

[0269] In some embodiments, refer to Figure 18 The volute tongue 322 includes the bottom shell body component 431.

[0270] The bottom shell body 431 has a recessed portion near the volute tongue windward portion 341, which is recessed in a direction away from the impeller 31. The side of the bottom shell body 431 on which the recessed portion is formed is the first flow guide wall surface 531.

[0271] The volute tongue 322 may include a volute tongue splice 432. The volute tongue splice 432 is disposed in the recessed portion, and the volute tongue splice 432 is spaced apart from the bottom shell body 431, the space forming a drainage channel 50.

[0272] The side of the spiral tongue splice 432 facing the first drainage wall 531 is the second drainage wall 532.

[0273] Both ends of the bottom shell body 431 along its length are connected to the air duct side plates. Both ends of the volute tongue splice 432 along its length are connected to the air duct side plates.

[0274] In some embodiments, the drainage inlet 51 of the drainage channel 50 is located at the upper part of the volute tongue windward portion 341.

[0275] The bottom shell body 431 includes a first air inlet guide 4311, a first airflow channel forming part 4312, a volute tongue tip 343, and a volute tongue air outlet 342 connected in sequence.

[0276] The first drainage wall 531 is the side surface of the first drainage channel forming part 4312.

[0277] According to an embodiment of this application, the volute tongue splice 432 may be hollow, and the interior of the volute tongue splice 432 extends through the longitudinal direction.

[0278] The volute tongue splice 432 includes a second air inlet guide part 4321 connected end to end, a volute tongue windward part 341, and a second drainage channel forming part 4322.

[0279] The second drainage wall 532 is the side surface of the second drainage channel forming part 4322.

[0280] The first air inlet guide section 4311 and the second air inlet guide section 4321 together form the air inlet guide section 36. The gap between the first air inlet guide section 4311 and the second air inlet guide section 4321 forms the drainage outlet 52 of the drainage channel 50.

[0281] The gap between the windward part 341 of the volute tongue and the tip 343 of the volute tongue forms the drainage inlet 51 of the drainage channel 50.

[0282] In other embodiments, the volute tongue splice 432 may be a solid structure, and the volute tongue splice 432 may be a solid rod.

[0283] The outer surface of the volute splice 432 includes a second air inlet guide surface 4321a, a volute windward surface 341a, and a second drainage wall surface 542.

[0284] In some embodiments, refer to Figure 19 The drainage inlet 51 of the drainage channel 50 is located in the upper middle part of the windward part 341 of the volute tongue.

[0285] The bottom shell body 431 includes a first air inlet guide 4311, a first airflow channel forming part 4312, a first volute tongue windward part 4313, a volute tongue tip 343, and a volute tongue air outlet part 342 connected in sequence.

[0286] The volute tongue splice 432 includes a first air inlet guide part 4321 connected end to end, a second volute tongue windward part 3423, and a second drainage channel forming part 4322.

[0287] The first air inlet guide section 4311 and the second air inlet guide section 4321 together form the air inlet guide section 36. The gap between the first air inlet guide section 4311 and the second air inlet guide section 4321 forms the drainage outlet 52 of the drainage channel 50.

[0288] The second volute tongue windward portion 3423 and the first volute tongue windward portion 4313 together form the volute tongue windward portion 341. The gap between the second volute tongue windward portion 3423 and the first volute tongue windward portion 4313 forms the drainage inlet 51 of the drainage channel 50.

[0289] The following describes Example 4 of the drainage channel 50:

[0290] Unlike Embodiment 3, in this embodiment, the drain outlet 52 is connected to the gap channel 50.

[0291] The flow channel 50 is used to draw out a portion of the backflow from the upstream region within the gap flow channel 30a and then send it to the downstream region within the gap flow channel 30a.

[0292] When the cross-flow fan 30 is running, a portion of the backflow continues to flow within the gap channel 30a; the other portion of the backflow flows into the diversion channel 50 and then flows to the downstream area within the gap channel 30a.

[0293] In this embodiment, a portion of the backflow within the gap channel 30a flows to the downstream region within the gap channel 30a through the diversion channel 50. On one hand, by diverting the backflow through the diversion channel 50, the airflow rate within the gap channel 30a can be reduced, thereby causing the eccentric vortex region at the impeller 31 to contract, thus improving the efficiency of the cross-flow fan. At the same time, due to the reduction in the flow rate within the gap channel 30a, abnormal noise at the gap channel 30a can be significantly reduced. On the other hand, the airflow flowing from the diversion channel 50 to the gap channel 30a can impact the backflow within the gap channel 30a, thereby controlling the eccentric vortex and further improving the efficiency of the cross-flow fan 30.

[0294] In some embodiments, the inlet 51 is connected to the beginning of the gap channel 30a, thereby allowing the gap backflow to be diverted at the beginning of the gap channel 30a.

[0295] The outlet 52 is connected to the tail end of the gap channel 30a, so that the airflow in the outlet channel 50 impacts the tail side of the gap return flow.

[0296] The following describes Example 5 of the drainage channel 50:

[0297] In some embodiments, refer to Figure 20 The volute tongue 322 is provided with a flow channel 50, which is used to draw out a portion of the return airflow and send it to the windward side of the lower part of the heat exchanger 20.

[0298] When the cross-flow fan 30 is running, part of the return airflow flows to the gap flow channel 30a, and the other part of the return airflow flows into the guide channel 50 and then flows to the windward side of the lower part of the heat exchanger 20.

[0299] In this embodiment, the diversion channel 50 can first draw out a portion of the return airflow and then send it to the windward side of the lower part of the heat exchanger 20. By diverting the return airflow through the diversion channel 50, the return flow rate that forms the eccentric vortex can be reduced, thereby causing the eccentric vortex region at the impeller 31 to shrink and improving the efficiency of the cross-flow fan 30. Moreover, the airflow flowing out of the diversion channel 50 flows to the lower part of the heat exchanger 20, which can improve the airflow in the lower part of the heat exchanger 20 and improve the heat exchange efficiency in the lower part of the heat exchanger 20.

[0300] In some embodiments, the inlet 51 of the drainage channel 50 is located on the windward side 343b of the return airflow, and the drainage channel 50 extends from the inlet 51 to the windward space 2122 of the water receiving tray 212.

[0301] The drainage outlet 52 of the drainage channel 50 is located on the air inlet side baffle 2121 of the water receiving tray 212. The drainage outlet 52 is connected to the windward space 2122.

[0302] In some embodiments, with reference to the airflow direction within the drainage channel 50, at least the downstream portion of the drainage channel 50 extends downward toward the heat exchanger 20. This allows the drainage outlet 52 to be located at a lower position, preventing condensate from the drip tray from flowing into the drainage channel 50 through the drainage outlet 52.

[0303] In some embodiments, the drainage channel 50 may include multiple interconnected segments.

[0304] The flow channel 50 may include a first flow segment 541. The first flow segment 541 is connected to the flow inlet 51. The first flow segment 541 may be a straight segment or an arc segment. The first flow segment 541 extends gradually downward from the flow inlet 51 and in a direction away from the impeller 31.

[0305] The drainage channel 50 may include a second drainage section 542. The second drainage section 542 is connected to the drainage outlet 52. The second drainage section 542 extends downward and toward the heat exchanger 20, starting from one end near the first drainage section 541.

[0306] The first drainage segment 541 and the second drainage segment 542 are connected by an arc segment. The second drainage segment 542 may be a straight segment, allowing gas within the drainage channel 50 to flow out along a shorter path. In other embodiments, the second drainage segment 542 may be an arc segment with a small curvature.

[0307] In some embodiments, the second flow-guiding section 542 gradually expands along the flow direction of the airflow within it. In this way, the airflow continuously decreases in speed within the second flow-guiding section 542, thereby enabling this portion of the airflow to exchange heat sufficiently with the heat exchanger 20.

[0308] In some embodiments, in the height direction, the outlet 52 is positioned higher than the bottom of the heat exchanger 20, and there is a gap between the outlet 52 and the bottom of the heat exchanger 20, so as to prevent the water level of the condensate accumulated in the drip tray 212 from being higher than the outlet 52 and blocking the outlet 52.

[0309] In some embodiments, the condensate in the drip tray 212 has a preset drainage level. When the condensate level reaches the preset drainage level, the drain pump is started to pump the condensate away.

[0310] The distance m from the outlet 52 to the inner bottom wall of the receiving tray 212 is higher than the preset drainage water level.

[0311] Another embodiment for improving the airflow at the bottom of heat exchanger 20:

[0312] Reference Figure 21 The flow channel 50 is used to send part of the outlet airflow to the windward side of the lower part of the heat exchanger 20.

[0313] When the cross-flow fan 30 is running, most of the outlet airflow still flows to the outlet side through the outlet duct 32c, and a small portion of the outlet airflow flows into the diversion channel 50.

[0314] The airflow in the drainage channel 50 flows to the lower part of the heat exchanger 20 through the drainage outlet 52, thereby improving the heat exchange effect of the lower part of the heat exchanger 20.

[0315] The inlet 51 of the drainage channel 50 is located on the air outlet surface 342a of the volute tongue.

[0316] The following describes Example 6 of the drainage channel 50:

[0317] In some embodiments, refer to Figure 22 The flow channel 50 may have multiple channels. The multiple flow channels 50 include a first flow channel 561. The first flow channel 561 directs a portion of the outlet airflow to the windward side of the lower part of the heat exchanger 20.

[0318] The inlet 51 of the first diversion channel 561 is located on the air outlet surface 342a of the volute tongue, and the outlet 52 of the first diversion channel 561 is located on the air inlet side baffle 2121 of the water receiving tray 212.

[0319] In this embodiment, the first drainage channel 561 can improve the heat exchange effect at the lower part of the heat exchanger 20.

[0320] Multiple drainage channels 50 include a second drainage channel 562.

[0321] The inlet 51 of the second drainage channel 562 is located in the air intake area of ​​the volute tongue 322. The outlet 52 of the second drainage channel 562 is located in the air outlet area.

[0322] In some embodiments, the inlet 51 of the second drainage channel 562 is located on the windward surface 343b of the return airflow, and the outlet 52 of the second drainage channel 562 is located on the windward surface 341a of the volute tongue and is relatively close to the air inlet guide surface 36a.

[0323] In this embodiment, the second flow channel 562 can guide the return airflow, thereby reducing the flow rate of the gap return and improving the pressure resistance of the cross-flow fan. The outlet airflow of the second flow channel 562 can also impact the gap return, thereby controlling the eccentric vortex and further improving the pressure resistance of the cross-flow fan.

[0324] In some embodiments, on a cross-flow fan 30 perpendicular to the axis of impeller 31, lines n5 and n6 are defined to be parallel to the second direction, and a second flow channel 562 is located between lines n5 and n6. The distance between lines n5 and n6 is less than 2*W4, where W4 is the maximum width of the second flow channel 562.

[0325] In some embodiments, a point on the second drainage channel 562 is located on line n5, and a point on the second drainage channel 562 is located on line n6. This allows the second drainage channel 562 to be more compact in the first direction, avoiding the second drainage channel 562 occupying too much space in the first direction. In addition, it allows the length of the second drainage channel 562 to be shorter, improving the drainage efficiency of the second drainage channel 562.

[0326] The following describes Example 7 of the drainage channel 50:

[0327] In some embodiments, refer to Figure 23 and Figure 24 The drainage channel 50 may have multiple drainage channels. The drainage inlet 51 of the drainage channel 50 is located in the drainage intake area of ​​the volute tongue 322. The drainage outlet 52 of the drainage channel 50 is located in the drainage outlet area.

[0328] The flow channel 50 includes a first flow channel 561. The first flow channel 561 is used to direct a portion of the return airflow to the gap flow channel 30a.

[0329] In some embodiments, the first drainage channel 561 connects the upstream side 30b of the gap channel 30a to the gap channel 30a.

[0330] The inlet 51 of the first diversion channel 561 is located on the windward surface 343a of the return airflow, and the outlet 52 of the first diversion channel 561 is located on the windward surface 341a of the volute tongue and is relatively close to the air inlet guide surface 36a.

[0331] The airflow channel 50 includes a second airflow channel 562. The second airflow channel 562 is used to direct a portion of the return airflow to the air inlet duct 32a.

[0332] The second flow channel 562 is located away from the impeller 31 relative to the first flow channel 561. The second flow channel 562 connects the upstream side 30b of the gap flow channel 30a with the air inlet duct 32a.

[0333] The inlet 51 of the second diversion channel 562 is located on the windward surface 343a of the return airflow, and the outlet 52 of the second diversion channel 562 is located on the air inlet guide surface 36a.

[0334] The first flow channel 561 draws out a portion of the return airflow and then sends it to the tail side of the gap flow channel 30a. The second flow channel 562 draws out a portion of the return airflow and then sends it to the air inlet duct 32a.

[0335] In this embodiment, both the first flow channel 561 and the second flow channel 562 can draw out a portion of the return airflow, thereby reducing the gap backflow into the gap flow channel 30a and improving the pressure resistance of the cross-flow fan.

[0336] Meanwhile, the outlet airflow of the first diversion channel 561 can also impact the gap backflow, thereby controlling the eccentric vortex and further improving the pressure resistance of the cross-flow fan.

[0337] Meanwhile, the outlet airflow of the second intake channel 562 can also improve the intake efficiency of the impeller.

[0338] In some embodiments, on a cross-sectional area of ​​the cross-flow fan 30 perpendicular to the axis of the impeller 31, lines n5 and n6 are defined parallel to a second direction, and a first flow channel 561 is located between lines n5 and n6. A point on the first flow channel 561 is located on line n5, and a point on the first flow channel 561 is located on line n6.

[0339] The vertical distance between line n5 and line n6 is less than 2*W4, where W4 is the maximum width of the first drainage channel 561.

[0340] This allows the first drainage channel 561 to be more compact in the first direction, avoiding it from occupying too much space and enabling the first drainage channel 561 and the second drainage channel 562 to be arranged separately. Additionally, it allows the first drainage channel 561 to be shorter, improving its efficiency in guiding the return airflow.

[0341] In some embodiments, one side wall of the first drainage channel 561 is connected to the windward surface 341a of the volute tongue at the drainage inlet 51 via a first arc surface 391, and one side wall of the second drainage channel 562 is connected to the air outlet surface 342a of the volute tongue at the drainage inlet 51 via a second arc surface 392.

[0342] On the cross section of the cross-flow fan 30 perpendicular to the axis of the impeller 31, line n1 passes through the axis O of the impeller 31 and is tangent to the first arc surface 391; line n2 passes through the axis O of the impeller 31 and is tangent to the second arc surface 392; the angle θ1 between line n1 and the X-axis is greater than the angle θ2 between line n2 and the X-axis.

[0343] The following describes an eighth embodiment of the drainage channel 50:

[0344] In some embodiments, refer to Figure 25The flow channel 50 may have multiple channels. The difference from Embodiment 7 is the second flow channel 562. The second flow channel 562 is used to direct a portion of the return airflow to the windward side of the lower part of the heat exchanger 20.

[0345] The outlet 52 of the second drainage channel 562 is located on the air inlet side baffle 2121 and is connected to the windward space 2122 of the water receiving tray 212.

[0346] In this embodiment, both the first diversion channel 561 and the second diversion channel 562 can divert the return airflow, thereby reducing the backflow into the gap channel 30a and improving the pressure resistance of the cross-flow fan.

[0347] Meanwhile, the outlet airflow of the first drainage channel 561 can also impact the backflow in the gap, thereby controlling the eccentric vortex and further improving the pressure resistance of the cross-flow fan. Simultaneously, the outlet airflow of the second drainage channel 562 can also improve the heat exchange efficiency of the lower part of the heat exchanger 20.

[0348] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0349] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. An indoor unit for an air conditioner, characterized in that, include: case; The heat exchanger is located inside the housing; A volute is disposed within the shell; The volute tongue is disposed inside the housing and forms an air inlet duct with the housing. The volute tongue is connected to the volute housing to form an impeller mounting cavity and an air outlet duct. An impeller is disposed in the impeller mounting cavity and located between the air inlet duct and the air outlet duct; Driven by the impeller, air flows sequentially through the air inlet duct and the impeller mounting cavity to form an outlet airflow. The outlet airflow includes a return airflow that is guided and diverted by the volute tongue and flows towards the impeller, and an outlet airflow that flows towards the air outlet duct. The outlet airflow exchanges heat with the heat exchanger. The cochlear tongue includes: An air inlet guide surface forms the air inlet duct between itself and the housing; The volute tongue faces the impeller, and the gap between the volute tongue and the outer peripheral surface of the impeller forms a gap flow channel, which is used to guide the return airflow. The air outlet surface of the volute tongue forms the air outlet duct between itself and the volute shell; The tip surface of the volute tongue connects the windward side and the air outlet side of the volute tongue, and the tip surface of the volute tongue includes: The airflow front surface is used to guide the airflow towards the airflow duct; The return airflow windward surface is connected between the outlet airflow windward surface and the volute tongue windward surface, and is used to guide a portion of the return airflow on the return airflow windward surface to the gap channel; The volute tongue is provided with a flow channel, the flow inlet of the flow channel is located on the windward side of the return airflow, and the flow channel extends from the flow inlet to the gap channel; the flow channel is used to guide a portion of the return airflow on the windward side of the return airflow to the gap channel.

2. The indoor unit of the air conditioner according to claim 1, characterized in that, The boundary line between the outlet airflow and the return airflow formed after the outlet airflow is guided and diverted by the volute tongue is defined as the velocity cutoff line Co; The windward surface of the return airflow and the windward surface of the outlet airflow are located on both sides of the velocity cutoff line Co, respectively. The flow inlet is located on the side of the velocity cutoff line Co closer to the impeller, and the flow outlet is located on the windward side of the volute tongue.

3. The indoor unit of the air conditioner according to claim 2, characterized in that, On a cross-section of the indoor unit of the air conditioner perpendicular to the axis of the impeller, the radius of the impeller is defined as R, the minimum width of the drainage channel is W2, the minimum distance between the impeller and the volute tongue in the radial direction of the impeller is W0, and the velocity cutoff line Co is located outside a circle with the axis O of the impeller as the center and the radius as R+W0+2W2.

4. The indoor unit of the air conditioner according to claim 3, characterized in that, The distance between the windward side of the volute tongue and the tip of the volute tongue on the radial side of the impeller is W1, and the distance L from the inlet to the axis O of the impeller satisfies R+W1≤L.

5. The indoor unit of the air conditioner according to claim 2, characterized in that, The drainage outlet is located on the windward side of the volute tongue near the air inlet guide surface.

6. The indoor unit of the air conditioner according to claim 5, characterized in that, One side wall of the drainage channel is connected to the air inlet guide surface at the drainage outlet by an arc transition.

7. The indoor unit of the air conditioner according to claim 1, characterized in that, The drainage channel includes: The first drainage segment is connected to the drainage inlet; The second drainage segment is connected between the first drainage segment and the drainage outlet of the drainage channel, and the angle between the second drainage segment and the first drainage segment is not less than 90°.

8. The indoor unit of the air conditioner according to claim 1, characterized in that, One wall of the drainage channel is connected to the windward surface of the volute tongue at the drainage inlet via a first arc surface, and the other wall of the drainage channel is connected to the air outlet surface of the volute tongue at the drainage inlet via a second arc surface.

9. The indoor unit of the air conditioner according to claim 1, characterized in that, The drainage channel gradually expands from the drainage inlet to the drainage outlet.

10. An indoor unit for an air conditioner, characterized in that, include: case; The heat exchanger is located inside the housing; A volute is disposed within the shell; The volute tongue is disposed inside the housing and forms an air inlet duct with the housing. The volute tongue is connected to the volute housing to form an impeller mounting cavity and an air outlet duct. An impeller is disposed in the impeller mounting cavity and located between the air inlet duct and the air outlet duct. Driven by the impeller, air flows sequentially through the air inlet duct and the impeller mounting cavity to form an outlet airflow. The outlet airflow includes a return airflow that is guided and diverted by the volute tongue and flows towards the impeller, and an outlet airflow that flows towards the air outlet duct. The outlet airflow exchanges heat with the heat exchanger. The cochlear tongue includes: An air inlet guide surface forms the air inlet duct between itself and the housing; The volute tongue faces the impeller, and the gap between the volute tongue and the outer peripheral surface of the impeller forms a gap flow channel, which is used to guide the return airflow. The air outlet surface of the volute tongue forms the air outlet duct between itself and the volute shell; The tip surface of the volute tongue connects the windward side and the air outlet side of the volute tongue, and the tip surface of the volute tongue includes: The airflow front surface is used to guide the airflow towards the airflow duct; The return airflow windward surface is connected between the outlet airflow windward surface and the volute tongue windward surface, and is used to guide a portion of the return airflow on the return airflow windward surface to the gap channel; The volute tongue is provided with a flow channel, which connects the upstream side of the gap flow channel to the gap flow channel. The upstream side of the gap flow channel is close to the windward side of the return airflow. When the impeller rotates, a portion of the return airflow flows directly into the gap channel, and a portion of the return airflow flows into the gap channel through the guide channel.

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