Indoor unit of air conditioner

Abstract

The invention 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 water pan, a volute and a volute tongue, the water pan is arranged below the heat exchanger, and the space, located on the windward side of the heat exchanger, in the water pan is a windward space; an air inlet duct is formed between the volute tongue and the shell, and an impeller mounting cavity and an air outlet duct are formed between the volute and the volute tongue; the impeller is arranged at the impeller mounting cavity and used for driving airflow to sequentially pass through the air inlet duct and the impeller mounting cavity to form outlet airflow, the outlet airflow comprises backflow airflow flowing back to the impeller and air outlet airflow flowing to the air outlet duct, and the air outlet airflow exchanges heat with the heat exchanger; the volute tongue is provided with a first drainage channel, a drainage inlet of the first drainage channel is formed in the air outlet face of the volute tongue, and the first drainage channel extends from the drainage inlet of the first drainage channel to the windward space and is used for guiding part of airflow of the air outlet channel to the lower portion of the heat exchanger. The air conditioner indoor unit can improve the heat exchange efficiency of the lower portion of the heat exchanger.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an air conditioning indoor unit. Background Art

[0002] Crossflow fans are widely used in wall-mounted and cabinet air conditioners due to their low noise and uniform air output. In recent years, as improvements in crossflow fans' compressive strength have been made, they have also been gradually adopted in ducted air conditioners.

[0003] The heat exchanger of a cross-flow duct air conditioner is usually located on the air outlet side of the cross-flow fan. The cross-flow fan blows air toward the heat exchanger, and the air temperature is regulated by the heat exchange between the heat exchanger and the air.

[0004] The air outlet side of the cross-flow duct faces the middle and upper part of the heat exchanger; the lower part of the heat exchanger is located in the water receiving tray, and there are problems such as poor airflow and vortex in the windward side area, resulting in poor heat exchange efficiency in the lower part of the heat exchanger. Summary of the Invention

[0005] The present application provides an air conditioner indoor unit, which can improve the heat exchange efficiency of the lower part of the heat exchanger.

[0006] In one aspect of the present application, an air conditioner indoor unit comprises: a housing, a heat exchanger, a water receiving tray, a volute, a volute tongue, and an impeller; the heat exchanger is located in the housing; the water receiving tray is located below the heat exchanger, and the space in the water receiving tray located on the windward side of the heat exchanger is a windward space; the volute and the volute tongue are both located in the housing, an air inlet duct is formed between the volute tongue and the housing, and the volute tongue is connected to the volute 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 passes through the air inlet duct and the impeller installation cavity in sequence to form an outlet airflow; the outlet airflow includes a return airflow flowing to the impeller and an outlet airflow flowing to the outlet duct, and the outlet airflow exchanges heat with the heat exchanger;

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

[0009] A first drainage channel is provided on the volute tongue, and the drainage inlet of the first drainage channel is provided on the wind outlet surface of the volute tongue. The first drainage channel extends from its drainage inlet to the windward space, and is used to guide a part of the outlet airflow on the wind outlet surface of the volute tongue to the lower part of the heat exchanger.

[0010] In this technical solution, a portion of the outlet airflow in the outlet duct flows to the lower part of the heat exchanger through the first guide channel, which can increase the air volume passing through the lower part of the heat exchanger, thereby improving the heat exchange effect of the lower part of the heat exchanger.

[0011] In some embodiments, the volute tongue includes a volute tongue air outlet portion, and the volute tongue air outlet surface is located on the volute tongue air outlet portion; the water receiving tray has an air inlet side water baffle located on the windward side of the heat exchanger, and the air inlet side water baffle is connected to the volute tongue air outlet portion; the drainage outlet of the first drainage channel is arranged on the air inlet side water baffle and is open to the windward space.

[0012] In this technical solution, by providing the drainage outlet, the airflow in the first drainage channel can flow to the lower part of the heat exchanger through the drainage outlet on the air inlet side water baffle.

[0013] In some embodiments, the extended direction line Lp3 of the drainage outlet intersects the lower portion of the heat exchanger.

[0014] In this technical solution, Lp3 intersects with the lower part of the heat exchanger, which can ensure that the airflow in the first drainage channel can flow to the lower part of the heat exchanger, and the airflow path from the drainage outlet to the lower part of the heat exchanger is shorter, so that the airflow in the first drainage channel can flow to the lower part of the heat exchanger faster.

[0015] In some embodiments, the distance m from the drainage outlet to the inner bottom wall of the water receiving tray is higher than a preset drainage water level of the water receiving tray.

[0016] In this technical solution, the drainage outlet is higher than the preset drainage water level of the water receiving tray, which can ensure that the condensed water in the water receiving tray will not enter the first drainage channel from the drainage outlet.

[0017] In some embodiments, the tip surface of the volute tongue includes: an outlet airflow windward surface, used to guide the outlet airflow to flow toward the outlet air duct; a return airflow windward surface, connected between the outlet airflow windward surface and the volute tongue windward surface, used to guide a portion of the return airflow on the return airflow windward surface to flow toward the gap flow duct;

[0018] A second drainage channel is provided on the volute tongue, and the drainage inlet of the second drainage channel is provided on the windward surface of the return airflow. The second drainage channel extends from its drainage inlet to the gap flow channel, and is used to guide a part of the return airflow on the windward surface of the return airflow to the gap flow channel.

[0019] In this technical solution, the second drainage channel can draw out a part of the return airflow on the upstream side of the gap flow channel and then send it to the gap flow channel. On the one hand, by drawing out the return airflow through the second drainage channel, the return flow rate forming the eccentric vortex can be reduced, thereby shrinking the area of ​​the eccentric vortex and improving the efficiency of the cross-flow fan; on the other hand, the airflow in the second drainage channel flows to the gap flow channel, which can form an impact interception on the gap return flow in the gap flow channel, thereby further controlling the eccentric vortex and improving the efficiency of the cross-flow fan.

[0020] In some embodiments, the dividing 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 respectively located on both sides of the velocity cutoff line Co; the drainage inlet of the second drainage channel is located on the side of the velocity cutoff line Co close to the impeller, and the drainage outlet of the second drainage channel is arranged on the windward surface of the volute tongue.

[0021] In some embodiments, on a cross section of the air conditioner indoor unit 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 a radius of R+W0+2W2.

[0022] In this technical solution, when L is within this range, it can be ensured that the return airflow rather than the outflow airflow enters the second drainage channel.

[0023] In some embodiments, in the radial direction of the impeller, the distance between the end of the windward surface of the volute tongue connected to the tip surface of the volute tongue and the impeller is W1, and the distance L from the drainage inlet of the second drainage channel to the axis O of the impeller satisfies R+W1≤L.

[0024] In this technical solution, by limiting the distance L between the drainage inlet of the second drainage channel and the impeller within this range, it can be ensured that the return airflow entering the second drainage channel is the return airflow before flowing into the gap flow channel.

[0025] In some embodiments, the end of the gap flow channel away from the tip of the volute tongue is the tail end of the gap flow channel, and the drainage outlet of the second drainage channel faces the tail end of the gap flow channel, so that the airflow of the second drainage channel flows toward the tail side of the gap flow channel.

[0026] In this technical solution, compared with the drainage outlet of the second drainage channel being toward the middle of the gap flow channel, the drainage outlet is set toward the tail end of the gap flow channel, which has a better control effect on the eccentric vortex and can better improve the efficiency of the cross-flow fan; in addition, the impact noise of the drainage airflow and the gap backflow is reduced.

[0027] Another aspect of the present application provides an air conditioner indoor unit, comprising: a housing; a heat exchanger located within the housing; a water receiving tray disposed below the heat exchanger, wherein the portion of the heat exchanger located within the water receiving tray is the lower portion of the heat exchanger; a volute and a volute tongue, both disposed within the housing, an air inlet duct formed between the volute tongue and the housing, the volute tongue and the volute being connected to form an impeller mounting cavity and an air outlet duct; an impeller disposed in the impeller mounting cavity and located between the air inlet duct and the air outlet duct;

[0028] Driven by the impeller, air passes through the air inlet duct and the impeller installation cavity in sequence to form an outlet airflow; the outlet airflow includes a return airflow flowing to the impeller and an outlet airflow flowing to the outlet duct, and the outlet airflow exchanges heat with the heat exchanger;

[0029] A first drainage channel is provided on the volute tongue, which connects the outlet air duct with the windward side of the lower part of the heat exchanger; when the impeller rotates, part of the outlet air flow flows to the heat exchanger through the outlet air duct, and part of the outlet air flow flows to the lower part of the heat exchanger through the first drainage channel.

[0030] In this technical solution, a portion of the outlet airflow in the outlet duct flows to the lower part of the heat exchanger through the first guide channel, which can increase the air volume passing through the lower part of the heat exchanger, thereby improving the heat exchange effect of the lower part of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 shows a cross-sectional view of an air conditioner indoor unit;

[0032] Figure 2 Shown Figure 1 a cross-sectional view of the middle air duct assembly;

[0033] Figure 3 Shown Figure 1 Schematic diagram of air flow direction at the middle impeller;

[0034] Figure 4 Shown Figure 1 Schematic diagram of the airflow direction;

[0035] Figure 5 Shown Figure 4 Schematic diagram of the middle cochlear tongue in the EE direction;

[0036] Figure 6 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 1 ;

[0037] Figure 7 and Figure 8 Shown Figure 6 Enlarged view of the middle X direction;

[0038] Figure 9 Shown Figure 6 Schematic diagram of the middle cochlear tongue;

[0039] Figure 10 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 2 ;

[0040] Figure 11 Shown Figure 10 Enlarged view of the Y direction;

[0041] Figure 12 Shown Figure 10 Schematic diagram of the impeller and volute tongue;

[0042] Figure 13 Shown Figure 10 Schematic diagrams of the snail tongue of some embodiments;

[0043] Figure 14 Shown Figure 10 Schematic diagrams of the snail tongue of other embodiments;

[0044] Figure 15 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 3 ;

[0045] Figure 16 Shown Figure 15 Enlarged view of the Z direction;

[0046] Figure 17 A schematic diagram showing the case where the windward surface of the volute tongue is concave;

[0047] Figure 18 Shown Figure 15 Schematic diagrams of the snail tongue of some embodiments;

[0048] Figure 19 Shown Figure 15 Schematic diagrams of the snail tongue of other embodiments;

[0049] Figure 20 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 4 ;

[0050] Figure 21 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 5 ;

[0051] Figure 22 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 6 ;

[0052] Figure 23 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 7 ;

[0053] Figure 24 Shown Figure 23 Enlarged view of the middle P direction;

[0054] Figure 25 A cross-sectional view of an air conditioner indoor unit according to some embodiments is shown. Figure 8 ;

[0055] Figure 26 The figure shows the linear diagram of work done before and after the drainage channel is installed in the indoor unit of the air conditioner;

[0056] Figure 27 A simulation diagram of the air flow velocity at the drainage channel in the related art is shown;

[0057] Figure 28 A schematic diagram showing the airflow direction in the drainage channel in the related art is shown;

[0058] Figure 29 A simulation diagram of the air flow velocity before the crossflow fan is provided with a drainage channel is shown;

[0059] Figure 30 A simulation diagram of air flow velocity after a crossflow blower is provided with a drainage channel according to some embodiments is shown;

[0060] Figure 31 A simulation diagram of air flow velocity after a cross-flow blower is provided with a drainage channel according to some other embodiments is shown. DETAILED DESCRIPTION

[0061] In order to make the purpose and implementation of this application clearer, the exemplary implementation of this application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only part of the embodiments of this application, not all of the embodiments.

[0062] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0063] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0065] The air conditioner indoor unit of this application is applicable to duct units, wall-mounted units and cabinet units. The following mainly takes the duct unit as an example to explain in detail:

[0066] Reference Figure 1 and Figure 2 The air conditioner indoor unit includes a shell 10, which forms the appearance of the air conditioner indoor unit; a cross-flow fan 30, which is arranged in the shell 10 and is used to drive the air flow.

[0067] Crossflow blower 30 includes an impeller 31. Impeller 31 is multi-bladed, elongated cylindrical, with forward-facing, multi-winglet blades. As impeller 31 rotates, airflow enters the blade cascade at the opening of impeller 31, passes through the interior of impeller 31, and exits through the blade cascade on the other side, forming the working airflow.

[0068] The impeller 31 can be made of plastic and is injection molded.

[0069] The crossflow fan 30 includes a crossflow duct assembly 32. The internal space enclosed by the crossflow duct assembly 32 forms a fan duct, which is a flow space for airflow when the impeller 31 is working.

[0070] The fan duct includes an air inlet duct 32a, an impeller installation cavity 32b and an air outlet duct 32c which are sequentially connected along the flow direction of the airflow.

[0071] In some embodiments, the air conditioner indoor unit may include a heat exchange duct assembly, which together with the crossflow duct assembly 32 constitutes the duct assembly of the air conditioner indoor unit.

[0072] The internal space of the heat exchange duct assembly forms a heat exchange chamber 21a, and the heat exchange chamber 21a is connected to the downstream of the air outlet duct 32c.

[0073] In some embodiments, the air inlet 101 may be formed by opening a portion of the bottom of the housing 10 . The air outlet 103 may be formed by opening at least a portion of a side of the housing 10 .

[0074] 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 provided at the air inlet 101 to prevent the introduction of foreign matter.

[0075] The air outlet 103 is in communication with the heat exchange chamber 21 a , and the air flow passing through the heat exchange chamber 21 a is discharged into the indoor space through the air outlet 103 .

[0076] The air outlet 103 can be connected to an air duct, and one end of the air duct away from the air outlet 103 can extend into the indoor space. An air outlet flange for connecting to the air duct can be provided at the air outlet 103.

[0077] In some embodiments, the crossflow air duct assembly 32 includes a volute 321 . The volute 321 includes an arc-shaped air cavity plate 331 and a diffuser top plate 332 connected to the air cavity plate 331 .

[0078] Projected on a plane perpendicular to the axis of the 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 axial direction of the impeller 31. The X-axis is parallel to the first direction, and the X-axis passes through the axis O of the impeller 31.

[0079] Along the flow direction of the air flow, the distance from the air chamber plate 331 to the axis O of the impeller 31 gradually increases.

[0080] The pressure diffuser top plate 332 can be substantially in the shape of a flat plate, and the pressure diffuser top plate 332 is tangentially connected to the air chamber plate 331. The pressure diffuser top plate 332 and the air chamber plate 331 can be integrally formed.

[0081] In some embodiments, the diffuser top plate 332 may also be a curved plate that is close to a flat plate, or the diffuser top plate 332 may be a combination of a curved plate and a flat plate.

[0082] In some embodiments, the cross-flow duct assembly 32 includes a volute tongue 322 , which includes an air inlet guide portion 36 .

[0083] The housing 10 may include an air inlet duct wall 11. The air inlet duct wall 11 and the air inlet guide portion 36 are spaced apart along the first direction, and the space therebetween forms an air inlet duct 32a.

[0084] The air inlet guide portion 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.

[0085] Specifically, the air inlet guide portion 36 includes an air inlet guide surface 36a facing the air inlet duct 32a. The air inlet guide surface 36a and the air inlet duct wall 11 form the air inlet duct 32a.

[0086] The volute tongue 322 may include a volute tongue windward portion 341 close to the impeller 31. The volute tongue windward portion 341 and the air chamber plate 331 of the volute 321 form an impeller mounting chamber 32b. The impeller 31 is mounted in the impeller mounting chamber 32b.

[0087] The volute tongue windward portion 341 is the portion of the volute tongue 322 that is closer to the impeller 31. The volute tongue windward portion 341 is opposite to the impeller 31.

[0088] The volute tongue windward portion 341 is connected to the air inlet guide portion 36 , and the two can be integrally formed. The air inlet guide portion 36 starts from the end connected to the volute tongue windward portion 341 and extends in a direction away from the impeller 31 .

[0089] The windward portion 341 of the volute tongue and the air inlet guide portion 36 can be connected by an arc transition, which is beneficial to the flow of air.

[0090] The volute tongue windward portion 341 includes a volute tongue windward surface 341 a connected to the air inlet guide surface 36 a.

[0091] The volute tongue 322 may include a volute tongue air outlet portion 342, which is opposite to the diffuser top plate 332. The volute tongue air outlet portion 342 and the diffuser top plate 332 cooperate to form an air outlet duct 32c.

[0092] Specifically, the volute tongue air outlet portion 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.

[0093] The volute tongue 322 may include a volute tongue tip 343. The portion of the volute tongue 322 connected between the volute tongue windward portion 341 and the volute tongue air outlet portion 342 is the volute tongue tip 343.

[0094] The volute tongue tip 343 includes a volute tongue tip surface 343a connected between the volute tongue windward surface 341a and the volute tongue wind outlet surface 342a.

[0095] In some embodiments, the tongue tip 343 may be arc-shaped. Since the extension line of the tongue windward portion 341 and the extension line of the tongue outlet portion 342 intersect at an acute angle, the tongue tip 343 is connected between the tongue windward portion 341 and the tongue outlet portion 342, thereby ensuring a smooth connection between the two.

[0096] In the height direction, the volute tongue tip 343 is higher than the axis O of the impeller 31 , and there is a predetermined vertical distance between the volute tongue tip 343 and the axis O of the impeller 31 .

[0097] The heat exchange air 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.

[0098] The heat exchange chamber top plate 211 can be integrally formed with the housing 10. The water receiving tray 212 can be integrally formed with the housing 10.

[0099] In some embodiments, the volute air outlet portion 342 may be connected to an end of the water receiving tray 212 close to the impeller 31 .

[0100] 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 water baffle 2121. The volute tongue air outlet portion 342 can be connected to the top end of the air inlet side water baffle 2121.

[0101] In some embodiments, the volute tongue air outlet portion 342 may be integrally formed with the water receiving tray 212 .

[0102] In some embodiments, the air duct assembly may include air duct side panels. The third direction is defined as being parallel to the axis of the impeller 31, and the air duct side panels are disposed at both ends of the fan air duct in the third direction. The air duct side panels are disposed at both ends of the heat exchange chamber 21a in the third direction, thereby enclosing the fan air duct and both sides of the heat exchange chamber 21a in the third direction.

[0103] A portion of the air duct side plate is the side wall of the cross-flow air duct assembly 32 , and another portion of the air duct side plate is the side wall of the heat exchange air duct assembly.

[0104] The cross-flow blower 30 may include a motor serving as a power source for the impeller 31 , with an output shaft of the motor being connected to the impeller 31 .

[0105] The motor may be located at an axial end of the impeller 31 . When the motor is working, it provides a rotational driving force to the impeller 31 , causing the impeller 31 to rotate, thereby driving the airflow.

[0106] The air conditioner indoor unit includes a heat exchanger 20, which is disposed in a heat exchange chamber 21a. The heat exchanger 20 is used to absorb heat from the air flow introduced into the heat exchange chamber 21a or transfer heat to the air flow.

[0107] The heat exchanger 20 may include a refrigerant pipe through which the refrigerant flows, and heat exchange fins connected to the refrigerant pipe to increase a heat exchange area. The heat exchanger 20 may be disposed on an air outlet side of the cross flow fan 30.

[0108] The water receiving tray 212 is disposed below the heat exchanger 20 and is used to collect condensed water generated on the heat exchanger 20 .

[0109] When the air conditioner indoor unit is running, when 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 forms condensed water on the surface of the heat exchanger 20, and the condensed water flows downward under the action of gravity and flows into the water receiving tray 212.

[0110] The water receiving pan 212 is connected to a drain pipe located outside the air conditioner indoor unit to drain the condensed water through the drain pipe.

[0111] Reference Figure 3 and Figure 4 The impeller 31 drives the airflow through the air inlet duct 32a and the impeller installation cavity 32b to form an outlet airflow.

[0112] The airflow within the impeller 31 is complex, and the velocity field is unstable. A vortex, namely an eccentric vortex 60, exists within the impeller 31 near the volute tongue 322. Outside the eccentric vortex, the airflow streamlines within the impeller 31 are arc-shaped. This portion of the airflow is referred to as the crossflow 62. The crossflow 62 flows from the impeller 31 to the outlet duct 32c, becoming the outlet airflow 63, which is ultimately delivered to the room.

[0113] That is, the impeller 31 has a forced vortex type eccentric vortex 60 near the volute tongue 322, and a free vortex type crossflow 62 away from the volute tongue 322. The airflow inside the impeller 31 can be divided into two parts: one is the effective inlet air, and the other is the flow participating in the eccentric vortex circulation.

[0114] Therefore, the outlet airflow of the impeller 31 includes an outlet airflow 63 flowing toward the outlet air duct 32 c and a return airflow flowing back to the impeller 31 .

[0115] A gap between the volute tongue windward surface 341 a of the volute tongue windward portion 341 and the outer peripheral surface of the impeller 31 forms a gap flow channel 30 a.

[0116] A portion of the return flow directly returns to the impeller 31, and a portion of the return flow passes through the gap flow channel 30a and returns to the impeller 31. In this application, the return flow that flows into the gap flow channel 30a is also referred to as gap return flow.

[0117] The position of the eccentric vortex has a great influence 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 farther away from the volute tongue 322, the area of ​​the eccentric vortex increases, the fan efficiency decreases, and the flow instability increases.

[0118] As 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 back pressure increases, the center of the eccentric vortex moves from the area near the volute tongue toward 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.

[0119] In order to improve the fan performance of the crossflow fan 30 under high back pressure conditions, in some embodiments, referring to Figures 6 to 25 A drainage channel 50 is provided on the volute tongue 322, which is used to guide out part of the backflow generated by the impeller 31 to reduce the airflow rate forming the eccentric vortex, thereby reducing the suction area of ​​the eccentric vortex, so that the center of the eccentric vortex can be close to the volute tongue 322; the suction area of ​​the eccentric vortex is reduced, and the effective cross-flow area at the impeller 31 is expanded, thereby increasing the effective air output of the cross-flow fan 30 and improving the stability of the airflow.

[0120] As back pressure increases, the velocity of the gap return flow at the gap flow channel 30a increases, and the collision between the return flow and the volute tongue 322 becomes more intense, resulting in increased noise from the crossflow blower 30. In the present application, by directing part of the return flow through the diversion channel 50, the gap return flow is reduced, which in turn reduces the impact force between the gap return flow and the volute tongue 322, thereby reducing the noise of the crossflow blower 30.

[0121] Reference Figure 26 The position on the circumference of the impeller 31 where it intersects the positive direction of the X-axis is 0°, and a 360° angle distribution is formed in the clockwise direction. The horizontal axis represents the circumferential angle of the impeller 31, and the vertical axis represents the work capacity. The dotted line S represents the work line of the impeller when there is no drainage channel, and the solid line T represents the work line of the impeller after the drainage channel of the present application is provided. Observing from the horizontal axis in the figure, the left end of the solid line T is located to the left of the dotted line S, and the right end of the solid line T is located to the right of the dotted line S, indicating that the work area of ​​the impeller 31 of the present application has been expanded after the drainage channel is provided. Observing from the vertical axis in the figure, when the horizontal axes are the same, the solid line T is located above the dotted line S, indicating that the degree of work of the impeller 31 of the present application has been improved after the drainage channel is provided.

[0122] Therefore, the present application provides a diversion channel 50 at the volute tongue 322, so that when the return airflow generated by the impeller 31 contacts the volute tongue, at least a portion of the airflow originally carried to the eccentric vortex can be redirected to the diversion channel 50. Since the airflow in the eccentric vortex area is reduced, it will cause the eccentric vortex to shrink, expand the effective working area inside the impeller 31, and increase the degree of work, greatly improving the performance of the crossflow fan.

[0123] In addition, in the related art, part of the outlet air flow is directed to the gap flow channel, attempting to use this part of the outlet air flow to impact and intercept the air flow in the gap flow channel, or to direct part of the outlet air flow to the edge of the eccentric vortex to control the eccentric vortex. The outlet air flow is the effective outlet air volume of the air conditioner indoor unit, and the related art uses the outlet air flow to control the eccentric vortex, which will reduce the effective outlet air volume of the air conditioner indoor unit. However, the present application guides the return air flow from the source of the eccentric vortex, without losing the effective outlet air volume, and better improves the pressure resistance of the cross-flow fan.

[0124] The drainage inlet 51 of the drainage channel 50 is introduced below:

[0125] The inventors of this application found in their research that there are points with a velocity of 0 or close to 0 in the low-speed airflow area near the tongue tip 343a of the volute, and the line connecting these points is defined as the velocity cutoff line Co. Figure 4 and Figure 5On the side of the velocity cutoff line Co away from the impeller 31 (to the right of the velocity cutoff line Co in the figure), the outflow flows toward 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 figure), the return flow flows toward the impeller 31. In other words, the outlet airflow at the volute tongue tip 343 is split under the guidance of the volute tongue tip surface 343a, with one portion flowing to the left toward the gap flow channel 30a and the other portion flowing to the right toward the outlet air duct 32c. The velocity cutoff line Co is located between these two airflows.

[0126] In some embodiments, the inlet 51 is disposed on the volute tongue tip surface 342 a of the volute tongue 322 , and a portion of the inlet 51 is located on a side of the velocity cutoff line Co close to the impeller 31 .

[0127] In this way, it can be ensured that the airflow flowing into the diversion channel 50 must have a backflow airflow, reducing the backflow at the impeller 31, and leading out a part of the airflow that originally formed the eccentric vortex, which can limit the area of ​​the eccentric vortex and avoid the problem of a large eccentric vortex area and a small effective cross-flow area under high back pressure conditions, thereby improving the pressure resistance of the cross-flow fan 30.

[0128] In some embodiments, the inlet 51 is provided on the tip surface 342a of the volute tongue 322, and the entire inlet 51 is located on the side of the velocity cutoff line Co close to the impeller 31. In this way, it can be ensured that the airflow entering the inlet channel 50 is all return airflow without any outflow.

[0129] In some embodiments, reference Figure 6 and Figure 7 In the cross-flow fan section perpendicular to the axis of the impeller 31, the radius of the impeller 31 is R; in the radial direction of the impeller 31, the minimum distance from the impeller 31 to the windward surface 341a of the volute tongue is W0; the minimum width of the drainage channel 50 is W2.

[0130] The distance between the velocity cutoff line Co and the impeller axis O is greater than (R+W0+2W2). The circle with the impeller axis O as the center and (R+W0+2W2) as the radius is the boundary circle C. The velocity cutoff line Co is located outside the boundary circle C.

[0131] The distance between the drainage inlet 51 of the drainage channel 50 and the axis O of the impeller 31 is L, L≤R+W0+2W2, which can ensure that all the air entering the drainage inlet 50 is return airflow.

[0132] Continue to refer to Figure 4 and Figure 5 The outlet airflow at the volute tongue tip surface 343a is guided and divided by the volute tongue tip surface 343a to form a return airflow flowing to the impeller 31 and an outlet airflow flowing to the outlet duct 32c.

[0133] The volute tongue tip surface 343a 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 thereon to flow toward the gap flow channel 30a.

[0134] The tongue tip surface 343a includes an outlet airflow windward surface 343c. The outlet airflow windward surface 343c is connected between the return airflow windward surface 343b and the tongue outlet airflow surface 342a. The outlet airflow windward surface 343c is used to guide the outlet airflow thereon to flow toward the outlet air duct 32c.

[0135] The return airflow windward surface 343 b is located on the side of the velocity cutoff line Co close to the impeller 31 , and the outflow airflow windward surface 343 c is located on the side of the velocity cutoff line Co away from the impeller 31 .

[0136] In some embodiments, reference Figures 6 to 14 The drainage inlet 51 of the drainage channel 50 can be provided on the windward surface 343b of the return airflow, and the drainage inlet 51 and the upstream side 30b of the gap flow channel 30a (combined with reference to Figure 3 ) is connected, and a part of the return air flow will enter the drainage channel 50 through the drainage inlet 51 before flowing to the gap flow channel 30a, thereby reducing the eccentric vortex volume, causing the eccentric vortex area to shrink, and the effective working area of ​​the impeller 31 to expand, thereby improving the air output and pressure resistance of the cross-flow fan 30.

[0137] In the fan duct, the space near the windward surface 343b of the return airflow is the upstream side 30b of the gap flow channel 30a, and the return airflow first passes through the upstream side of the gap flow channel 30a and then flows into the gap flow channel 30a.

[0138] Specific reference Figure 7 On a cross-flow fan section perpendicular to the axis of the impeller 31, the end where the volute windward surface 341a connects to the volute tip surface 343a is designated U. In the radial direction of the impeller 31, the distance between the impeller 31 and U is W1. The distance L between the inlet 51 and the axis O of the impeller 31 satisfies the following: R + W1 ≤ L. This ensures that the entire inlet 51 is connected to the upstream side 30b of the gap flow channel 30a, and that the return airflow entering the inlet 51 is the return airflow that has flowed to the gap flow channel 30a.

[0139] Combined with reference Figure 3 A portion of the return airflow directly returns to the impeller 31 to form an eccentric vortex circulation, and another portion of the return airflow flows to the gap flow channel 30a, and flows from the gap flow channel 30a to the impeller 31 to form an eccentric vortex circulation.

[0140] In this embodiment, the inlet 51 is arranged on the windward surface 343b of the return airflow, so that the inlet 51 is located upstream of the gap flow channel 30a, which can reduce the backflow directly returning to the impeller 31 and reduce the backflow flowing to the gap flow channel 30a, reduce the flow rate of the two parts of the airflow forming the eccentric vortex, shrink the eccentric vortex area, and expand the effective working area of ​​the impeller 31.

[0141] In some embodiments, continue to refer to Figure 7 One side wall of the drainage channel 50 is transitionally connected to the windward surface 341a of the volute tongue at the drainage inlet 51 through a first arc surface 391, and the other side wall of the drainage channel 50 is transitionally connected to the wind outlet surface 342a of the volute tongue at the drainage inlet 51 through a second arc surface 392.

[0142] In some embodiments, reference Figure 8 and Figure 11 On a cross section of the cross flow blower 30 perpendicular to its axial direction, the direction Lp1 of the drainage channel 50 toward the inner side of the drainage channel at the drainage inlet 51 is parallel to the tangent of the windward surface 341a of the volute tongue at point U, or the angle between the two is α1.

[0143] α1 is an acute angle, which can make the angle between the inlet part of the drainage channel 50 and the windward surface 341a of the volute tongue relatively small, so that the resistance of the airflow flowing into the drainage channel 50 through the drainage inlet 51 is relatively small, which is conducive to the flow of air into the drainage channel 50.

[0144] If α1 is an obtuse angle, then the angle between the entrance part of the drainage channel 50 and the windward surface 341a of the volute tongue is relatively large, and the airflow needs to make a larger turning angle to flow into the drainage channel 50. This will increase the resistance of the airflow entering the drainage channel 50, thereby weakening the effect of the drainage channel 50 on draining the return airflow.

[0145] In some embodiments, reference Figures 15 to 19 The inlet 51 is located on the windward surface 341a of the volute tongue. Part of the gap backflow between the windward part 341 of the volute tongue and the impeller 31 flows to the inlet 51 to the inlet 50, which can reduce the flow rate of the gap backflow that forms the eccentric vortex, improve the pressure resistance of the cross-flow fan 30, and thus increase the air output volume of the cross-flow fan 30.

[0146] The end of the gap flow channel 30a close to the volute tongue tip surface 343a is the starting end of the gap flow channel 30a, and the end of the gap flow channel 30a close to the air inlet guide surface 36a (the end away from the volute tongue tip surface 343a) is the tail end of the gap flow channel 30a.

[0147] In some embodiments, the inlet 51 is provided on the windward surface 341 a of the volute tongue, close to the tip surface 343 a of the volute tongue.

[0148] When the inlet 51 is positioned relatively close to the air inlet guide surface 36a on the volute tongue's windward surface 341a, the gap return flow has already flowed to the tail side of the gap flow channel 30a, and its energy impact has been weakened. The gap return flow will also tend to flow into the impeller 31. If the pressure on the outlet 52 side of the diversion channel 50 is high, the airflow in the diversion channel 50 will easily flow backwards. That is, the airflow on the outlet 52 side will flow through the diversion channel 50 to the gap flow channel 30a, thereby rendering the diversion channel 50 ineffective in diverting the gap return flow. Therefore, the inlet 51 needs to be positioned relatively close to the volute tongue tip surface 343a on the volute tongue's windward surface 341a.

[0149] In some embodiments, specific reference is made to Figure 16 On a cross-section of the crossflow blower 30 perpendicular to the axis of the impeller 31, the distance between the end of the inlet 51 closest to the volute tongue tip 343a and the axis O of the impeller 31 is m1, and the distance between the end of the inlet 51 farther from the volute tongue tip 343a and the axis O of the impeller 31 is m2, where m1 ≥ m2. This allows a portion of the airflow within the gap flow channel 30a to enter the drainage channel 50 through the inlet 51.

[0150] In some embodiments, the windward surface 341a of the volute tongue is a curved surface that convexly projects toward the impeller 31. On a cross-section of the crossflow blower 30 perpendicular to the axis of the impeller 31, the position on the windward surface 341a closest to the impeller 31 is designated as Z1, and the inlet 51 is positioned between Z1 and U. This range ensures that a portion of the airflow within the gap flow channel 30a can enter the inlet 51 into the inlet channel 50.

[0151] Reference Figure 17 If the windward surface 341a of the volute tongue is an arc surface that is concave in the direction away from the impeller 31, the gap backflow is likely to flow along the line connecting the upper and lower ends of the arc surface (dashed arrow in the figure), and is less likely to flow toward the inlet 51.

[0152] In some embodiments, reference Figure 16 , one side wall of the drainage channel 50 is connected to the windward surface 341a of the volute tongue at the drainage inlet 51 through an arc, and the other side wall of the drainage channel 50 is connected to the tip surface 343a of the volute tongue at the drainage inlet 51 through an arc, so that the drainage channel 50 forms a smooth flow channel at the drainage inlet 51, thereby improving the smoothness of the backflow entering the drainage channel 50.

[0153] In some embodiments, the angle Lp1 of the drainage channel 50 toward the inside of the drainage channel at the drainage inlet 51 and the windward surface 341a of the volute tongue is less than 90 degrees. The inlet portion of the drainage channel 50 extends obliquely downward from the drainage inlet 51, ensuring that interstitial backflow can enter the drainage channel 50 relatively smoothly, avoiding the problem of high resistance to interstitial backflow entering the drainage channel 50 caused by the upward extension of the inlet portion of the drainage channel 50.

[0154] In some embodiments, on a cross section of the cross flow blower 30 perpendicular to the axis of the impeller 31 , a line passing through the end point of the volute tongue tip surface 343 a of the inlet 51 and parallel to the first direction is line Lp2 .

[0155] The entrance part of the drainage channel 50 and the volute tongue tip 343 are respectively located on both sides of the line Lp2, that is, the volute tongue tip surface 343a is located on the upper side of the line Lp2, and the entrance part of the drainage channel 50 is located on the lower side of the line Lp2, so that the entrance part of the drainage channel 50 tends to extend downward, avoiding the problem of high resistance to gap backflow entering the drainage channel 50 when the entrance part of the drainage channel 50 extends upward.

[0156] 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.

[0157] In this application, the portion of the volute tongue windward surface 341a near the volute tongue tip surface 343a and the return airflow windward surface 343b are referred to as the diversion air intake region. The diversion inlet 51 of the diversion channel 50 can be disposed within the diversion air intake region, thereby allowing a portion of the return airflow to enter the diversion channel 50 through the diversion inlet 51.

[0158] The drainage outlet 52 of the drainage channel 50 is introduced below:

[0159] In some embodiments, reference Figures 6 to 8 The drainage outlet 52 of the drainage channel 50 is located on the windward surface 341a of the volute tongue.

[0160] The outlet airflow of the diversion channel 50 can impact the gap backflow, thereby intercepting the gap backflow. The flow velocity of the gap backflow is reduced, and even part of the gap backflow can end the circulation stroke, thereby shrinking the suction area of ​​the eccentric vortex, thereby increasing the through-flow area at the impeller 31, and improving the fan efficiency and effective air flow rate.

[0161] In some embodiments, the drainage outlet 52 is provided on the windward surface 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 through an arc transition.

[0162] The endpoint of the volute tongue windward surface 341a near the drainage outlet 52 is denoted as J. The direction of the airflow in the drainage channel 50 flowing outward at the drainage outlet 52 is represented by the direction extension line Lp3. The angle α3 between the direction extension line Lp3 and the tangent line of the volute tongue windward surface 341a at point J is an obtuse angle. This allows the outlet airflow of the drainage channel 50 to impact the trailing side of the gap return flow, thereby improving the effect of controlling the eccentric vortex through the outlet airflow.

[0163] In some embodiments, reference Figures 10 to 19 The drainage outlet 52 of the drainage channel 50 is provided on the air inlet guide surface 36 a of the air inlet guide portion 36 .

[0164] The drainage outlet 52 is open toward the air inlet duct 32a and communicates with the air inlet duct 32a.

[0165] In this way, the return airflow in the guide channel 50 can re-enter the impeller 31 as a part of the incoming air.

[0166] Therefore, in this embodiment, the function of the guide channel 50 is to guide part of the return airflow to the air inlet side of the impeller 31, thereby reducing the gap return flow and increasing the air inlet volume.

[0167] In some embodiments, the drainage outlet 52 is located on the air inlet guide surface 36 a and is relatively close to the windward surface 341 a of the volute tongue.

[0168] The airflow exiting the diversion channel 50 flows first into the air inlet duct 32a before being drawn into the impeller 31. This diversion airflow impacts the edges of the eccentric vortex, effectively controlling it and further improving the crossflow blower's pressure resistance. Furthermore, it improves the air intake efficiency of the crossflow blower 30.

[0169] In some embodiments, reference Figure 12 On a cross-section of the crossflow blower 30 perpendicular to the axis of the impeller 31, a tangent line n4 is drawn from the end of the drainage outlet 52 farther from the gap flow channel 30a to the outer periphery of the impeller 31. The angle n4 makes with the X-axis is θ, with θ ≥ 40°. Within this range, the drainage airflow is guaranteed to impact the edges of the eccentric vortex and improve the intake airflow in the inlet duct 32a.

[0170] If θ<40°, the drainage outlet 52 will be relatively far away from the gap flow channel 30 a , and the airflow flowing out of the drainage outlet 52 will not have any effect on the eccentric vortex, but can only improve the intake efficiency.

[0171] The locations of the drainage outlet 52 on the windward surface 341a of the volute tongue and the air inlet guide surface 36a are both drainage outlet areas.

[0172] In some embodiments, reference Figure 20 There is a spacing space between the lower part of the heat exchanger 20 and the air inlet side water baffle 2121, so that the airflow driven by the impeller 31 can flow from the spacing space 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.

[0173] For ease of description, this application refers to the space within the water tray 212 located on the windward side of the heat exchanger 20 as the windward space 2122. The airflow driven by the impeller 31 is blown directly into the upper and middle portions of the heat exchanger 20; the outflow spreads outward, gradually passing through the windward space 2122 and flowing toward the lower portion of the heat exchanger 20.

[0174] The drainage outlet 52 of the drainage channel 50 is located on the air inlet side water baffle 2121 so that the drainage channel 50 is connected to the inner space of the water receiving tray 212. The outlet airflow of the drainage channel 50 flows to the lower part of the heat exchanger 20.

[0175] In this embodiment, the airflow in the guide channel 50 flows toward the heat exchanger 20 , which can increase the air output volume of the cross-flow fan 30 .

[0176] The windward space 2122 is located below the extension of the volute tongue outlet surface 342a. The airflow in this area is poorly fluid and prone to vortex turbulence, resulting in a relatively small amount of airflow through the lower portion of the heat exchanger 20, which prevents the lower portion of the heat exchanger 20 from fully utilizing its heat exchange function. By positioning the drainage outlet 52 on the air inlet-side water baffle 2121, the present application allows the drainage channel 50 to be directly connected to the windward space 2122 of the water receiving tray 212, increasing the airflow in the windward space 2122. This allows more airflow to pass through the lower portion of the heat exchanger 20 for heat exchange, thereby fully utilizing the heat exchange performance of the lower portion of the heat exchanger 20.

[0177] In some embodiments, the portion of the heat exchanger 20 located within the water receiving tray 212 is the lower portion of the heat exchanger 20 .

[0178] The drainage outlet 52 faces the lower portion of the heat exchanger 20. The extended direction line Lp3 of the drainage channel 50 intersects the lower portion of the heat exchanger 20. In this way, the gas flowing out of the drainage outlet 52 can be blown toward the lower portion of the heat exchanger 20 via a shorter path.

[0179] In some embodiments, the drainage outlet 52 faces the bottom wall of the windward space 2122. The extended direction line Lp3 of the drainage channel 50 intersects the bottom wall of the windward space 2122. In this way, the gas flowing out of the drainage outlet 52 will be blown toward the bottom of the windward space 2122, and then continue to spread and flow to the lower part of the heat exchanger 20.

[0180] The drainage channel 50 is introduced below:

[0181] In some embodiments, reference Figure 11 The width of the gap flow channel 30a is W3, and the width of the diversion channel 50 is W2, W2≥0.5W3, which can ensure that the diversion channel 50 diverts part of the return airflow, thereby ensuring the influence of the diversion channel 50 on the eccentric vortex, so that the suction area of ​​the eccentric vortex shrinks and the through-flow area at the impeller 31 expands, thereby improving the performance of the cross-flow fan.

[0182] If W2<0.5W3, the width of the drainage channel 50 is relatively narrow, and there may be a problem that the drainage channel 50 fails to induce sufficient return airflow, resulting in a limited improvement in the performance of the cross-flow blower.

[0183] In some embodiments, W2 ≤ 2W3. If W2 > 2W3, the drainage channel 50 is much wider than the clearance channel 30a. Since the drainage flow rate of the drainage channel 50 has an upper limit, the return airflow cannot flow into the drainage channel 50 completely. Therefore, if the drainage channel 50 is too large, its capacity will be wasted and the structural strength of the volute tongue 322 will be greatly reduced.

[0184] 0.5W3≤W2≤2W3. This ensures that the drainage channel 50 can improve the pressure resistance of the cross-flow blower without significantly affecting the structural strength of the volute tongue 322.

[0185] In some embodiments, 0.6W3≤W2≤0.8W3. Within this range of the widths of the guide channel 50 and the gap channel 30a, the guide channel 50 can improve the pressure resistance of the crossflow fan, meet the airflow volume requirements of the air conditioner indoor unit under various operating conditions, and ensure that the structural strength of the volute tongue 322 meets usage requirements.

[0186] 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 5-6 mm. W3 and W2 represent the minimum widths.

[0187] In other embodiments, W3 and W2 may be average widths; or W3 and W2 may be maximum widths.

[0188] In some embodiments, in a cross-section of the cross-flow blower 30 perpendicular to the axis of the impeller 31 , the shape of the guide channel 50 can be linear, arc-shaped, “V”-shaped, “L”-shaped, or serpentine.

[0189] In the present application, as long as the drainage inlet 51 of the drainage channel 50 is set in the drainage air intake area, the position of the drainage outlet 52 can be selected arbitrarily, and the structural form is diverse to meet the needs of different situations.

[0190] The following describes the first embodiment of the drainage channel 50:

[0191] In some embodiments, reference Figure 6 and Figure 7 , the drainage channel 50 connects the upstream side 30b of the gap flow channel 30a with the gap flow channel 30a.

[0192] The drainage inlet 51 of the drainage channel 50 is provided on the windward surface 343b of the return airflow. 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 portion of the return airflow on the windward surface 343b to flow to the gap flow channel 30a.

[0193] When the impeller 31 is in operation, a portion of the return airflow flows directly into the gap flow channel 30a, and a portion of the return airflow flows into the guide channel 50 and then flows to the gap flow channel 30a.

[0194] In this embodiment, the diversion channel 50 can first divert 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 flow rate that normally forms the eccentric vortex circulation can be reduced, so that the area where the eccentric vortex is located is contracted, and the throughflow area at the impeller 31 is expanded, thereby increasing the air volume of the crossflow fan 30 and improving the pressure resistance of the crossflow fan 30.

[0195] In addition, the airflow flowing from the guide channel 50 to the gap flow channel 30 a can impact the gap backflow in the gap flow channel 30 a, thereby controlling the eccentric vortex and further improving the efficiency of the cross-flow blower 30 .

[0196] In some embodiments, the drainage outlet 52 is provided on the windward surface 341a of the volute tongue and is communicated with the gap flow channel 30a.

[0197] In some embodiments, the drainage outlet 52 is provided at one end of the windward surface 341a of the volute tongue close to the air inlet guide surface 36a, and the drainage outlet 52 is connected to the tail end of the gap flow channel 30a. The airflow flowing out of the drainage channel 50 can impact the tail side of the gap return flow, thereby changing the flow direction of the gap return flow, and the gap return flow enters the impeller 31 for circulation in advance from the circumferential motion, thereby further shrinking the eccentric vortex area at the impeller 31, thereby further improving the efficiency of the cross-flow fan 30.

[0198] Reference Figure 27 and Figure 28 In most related technologies, part of the outlet air flow from the outlet duct is sent to the gap flow channel, and this part of the air flow is used to impact and block the gap backflow to control the eccentric vortex and improve the pressure resistance of the cross-flow fan.

[0199] After exiting the outlet, the drainage airflow intercepts the gap backflow and is also impacted by the gap backflow. Under this impact, the drainage outlet airflow deflects β toward the air inlet relative to the outlet direction extension line Lp3. That is, the angle between the drainage outlet airflow direction and the drainage outlet direction extension line Lp3 is β.

[0200] Due to the drainage effect of the drainage channel 50 on the backflow in the present application, the flow rate of the gap backflow is reduced, thereby reducing the impact of the gap backflow on the drainage outlet airflow. Therefore, the flow direction of the drainage outlet airflow in the present application does not deviate relative to the outlet direction extension line Lp3 or its deflection angle is smaller than that of the related art ( Figure 28 ) has a deflection angle β of the airflow at the outlet, the area of ​​the eccentric vortex of the present application is smaller than that of the eccentric vortex in the related art, and has a better effect on improving the pressure resistance of the cross-flow fan 30.

[0201] In some embodiments, reference Figure 7 , the drainage channel 50 can be formed by connecting multiple sections.

[0202] 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 line segment or an arc segment.

[0203] The first flow guiding segment 541 extends gradually downward from the flow guiding inlet 51 and away from the impeller 31 .

[0204] 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 line segment or an arc segment.

[0205] The second flow guiding segment 542 extends from the flow guiding outlet 52 upward and away from the impeller 31 .

[0206] The first drainage segment 541 and the second drainage segment 542 are connected by an arc segment.

[0207] The angle formed by the first drainage segment 541 and the second drainage segment 542 is not less than 90°, so that the turning angle on the drainage channel 50 is relatively large, thereby avoiding increasing the flow resistance of the airflow in the drainage channel 50 due to a too small turning angle.

[0208] In some embodiments, the drainage channel 50 exhibits a gradual expansion from its inlet 51 to its outlet 52. Specifically, 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 drainage airflow exiting the outlet 52 on the impeller 31, thereby reducing noise. The gradual change in the drainage channel 50 allows for smoother flow throughout the channel, ensuring smoother airflow within the channel 50.

[0209] In some embodiments, reference Figure 9 , the volute tongue 322 may include a bottom shell body 431.

[0210] The bottom shell body 431 is provided with a recessed portion at a position close to the volute tongue 322, which is recessed in a direction away from the impeller 31. The side of the bottom shell body 431 where the recessed portion is formed is a first drainage wall 531.

[0211] The volute tongue 322 may include a volute tongue splicing piece 432. The volute tongue splicing piece 432 is disposed in the recessed portion and spaced apart from the bottom shell body 431. The spaced apart space forms a drainage channel 50. The side of the volute tongue splicing piece 432 facing the first drainage wall 531 is a second drainage wall 532.

[0212] The two ends of the bottom shell body 431 in the longitudinal direction (parallel to the axis of the impeller 31) are connected to the air duct side panels. The two ends of the volute tongue splicing piece 432 in the longitudinal direction are connected to the air duct side panels.

[0213] In some embodiments, the bottom shell body 431 includes an air inlet guide portion 36 , a first drainage channel forming portion 4312 and a volute tongue air outlet portion 342 , and the first drainage wall surface 531 is a side surface on the first drainage channel forming portion 4312 .

[0214] The upper end of the first drainage channel forming portion 4312 may be connected to the volute tongue air outlet portion 342 via an arc segment.

[0215] The lower end of the first guide channel forming portion 4312 may be connected to the air inlet guide portion 36 via an arc segment.

[0216] In some embodiments, the volute tongue assembly 432 is block-shaped. The side of the volute tongue assembly 432 opposite to the second flow guide wall 532 is the volute tongue windward surface 341a.

[0217] The lower end of the volute tongue windward surface 341a is connected to the lower end of the second guide wall surface 532 through an arc. The upper end of the volute tongue windward surface 341a is connected to the upper end of the second guide wall surface 532 through an arc.

[0218] The following describes a second embodiment of the drainage channel 50:

[0219] In some embodiments, reference Figures 10 to 12 The drainage inlet 51 of the drainage channel 50 is arranged on the windward surface 343b of the return airflow, and the drainage channel 50 extends from the drainage inlet 51 to the air inlet duct 32a. The drainage channel 50 is used to guide out a part of the return airflow and then send it to the air inlet duct 32a.

[0220] When the cross-flow fan 30 is in operation, a portion of the return airflow flows directly into the gap flow channel 30a; another portion of the return airflow flows into the guide channel 50 and then flows toward the air inlet duct 32a.

[0221] In this embodiment, the diversion channel 50 can divert a portion of the return airflow on the upstream side of the gap flow channel 30a to the input end of the impeller 31. On the one hand, the diversion channel 50 diverts the return airflow, which can reduce the airflow rate entering the gap flow channel 30a, thereby shrinking the eccentric vortex area at the impeller 31, thereby 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 diverted 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.

[0222] Reference Figure 29 and Figure 30 , Figure 30 After setting the drainage channel 50, compared with Figure 29 The eccentric vortex area (Figure 1) is effectively shrunk, the cross-flow area at the impeller 31 is expanded, and the performance of the cross-flow fan is improved.

[0223] Continue to refer to Figure 29 A large low-pressure vortex is formed on the air intake side of the impeller 31 and in the area near the air intake guide portion 36 (see FIG. II), which reduces the air intake effect of the impeller 31.

[0224] Reference Figure 30 In the present application, the outlet of the guide channel 50 is connected 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.

[0225] In some embodiments, the drainage outlet 52 of the drainage channel 50 is provided on the air inlet guide surface 36a. The drainage outlet 52 is open toward the air inlet duct 32a and communicates with the air inlet duct 32a.

[0226] In some embodiments, the drainage outlet 52 of the drainage channel 50 is disposed 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 drainage outlet 52 can impact the edge of the eccentric vortex, thereby further controlling the eccentric vortex and improving the pressure resistance of the crossflow blower 30.

[0227] Due to the drainage effect of the drainage channel 50 on the backflow in the present application, the flow rate of the gap backflow is reduced, thereby reducing the impact of the gap backflow on the drainage outlet airflow. Therefore, the deflection angle of the drainage outlet airflow in the present application is smaller than the deflection angle β of the drainage outlet airflow in the related technology, and the area of ​​the eccentric vortex in the present application is smaller than the area of ​​the eccentric vortex in the related technology. The drainage channel 50 of the present application has a better effect on controlling the eccentric vortex.

[0228] In some embodiments, reference Figure 11 , the drainage channel 50 can be formed by connecting multiple sections.

[0229] 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 line segment or an arc segment.

[0230] The first flow guiding segment 541 extends gradually downward from the flow guiding inlet 51 and away from the impeller 31 .

[0231] 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 line segment or an arc segment.

[0232] The second flow guiding segment 542 extends from the flow guiding outlet 52 upward and away from the impeller 31 .

[0233] The first drainage segment 541 and the second drainage segment 542 are connected by an arc segment.

[0234] 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.

[0235] In some embodiments, the first guide segment 541 gradually expands along the airflow direction, thereby reducing the airflow velocity. The width of the second guide segment 542 can remain unchanged. As this portion of air continues to flow through the second guide segment 542 toward the air inlet duct 32a, its impact on the incoming airflow can be mitigated.

[0236] In other embodiments, the width of the first drainage segment 541 remains unchanged, and the width of the second drainage segment 542 may change in a gradually expanding manner.

[0237] 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 gradually slows the flow velocity within the drainage channel 50, reducing the impact of the drainage airflow flowing out of the outlet 52 on the normal intake airflow of the impeller 31.

[0238] In some embodiments, reference Figure 13 and Figure 14 , the volute tongue 322 includes a bottom shell body 431.

[0239] The bottom shell body 431 is provided with a recessed portion at a position close to the volute tongue 322, which is recessed in a direction away from the impeller 31. The side of the bottom shell body 431 where the recessed portion is formed is a first drainage wall 531.

[0240] The volute tongue 322 may include a volute tongue splicing piece 432. The volute tongue splicing piece 432 is disposed in the recessed portion and spaced apart from the bottom shell body 431. The spaced apart space forms a drainage channel 50. The side of the volute tongue splicing piece 432 facing the first drainage wall 531 is a second drainage wall 532.

[0241] The two ends of the bottom shell body 431 in the length direction are respectively connected to the side panels of the air duct. The two ends of the volute tongue splicing piece 432 in the length direction are respectively connected to the side panels of the air duct.

[0242] In some embodiments, the bottom shell body 431 includes a first air inlet guide portion 4311 , a first drainage channel forming portion 4312 and a volute tongue air outlet portion 342 .

[0243] The first drainage wall surface 531 is a side surface of the first drainage channel forming portion 4312 .

[0244] The first air inlet guide portion 4311 is connected to the lower end of the first guide channel forming portion 4312 via an arc segment. The upper end of the first guide channel forming portion 4312 is connected to the volute tongue air outlet portion 342 via an arc segment.

[0245] In some embodiments, the volute tongue splice 432 may be a solid structure, where the volute tongue splice 432 is a solid rod.

[0246] The side surface of the volute tongue assembly 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 portion 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.

[0247] In some embodiments, the volute tongue splicing piece 432 may be hollow, and the interior of the volute tongue splicing piece 432 is penetrated in the length direction.

[0248] The volute tongue assembly piece 432 includes a second air inlet guide portion 4321 , a volute tongue windward portion 341 and a second drainage channel forming portion 4322 .

[0249] The lower end of the first air inlet guide portion 4321 is connected to the lower end of the second drainage channel forming portion 4322 via an arc segment, and the upper end of the volute tongue windward portion 341 is connected to the upper end of the second drainage channel forming portion 4322 via an arc segment.

[0250] The second guide wall surface 532 is a side surface of the second guide channel forming portion 4322. The second air inlet guide surface 4321a is a side surface of the second air inlet guide portion 4321.

[0251] The first air inlet guide portion 4311 and the second air inlet guide portion 4321 constitute the air inlet guide portion 36 . The space between the first air inlet guide portion 4311 and the second air inlet guide portion 4321 forms the air outlet 52 of the air inlet channel 50 .

[0252] The following describes a third embodiment of the drainage channel 50:

[0253] In some embodiments, reference Figure 15 、 Figure 16 The drainage channel 50 is provided at the volute tongue 322, and the drainage channel 50 is used to guide out a part of the gap backflow and then send it to the air inlet duct 32a.

[0254] When the cross-flow fan 30 is in operation, a portion of the return airflow entering the gap flow channel 30a continues to flow in the gap flow channel 30a; another portion of the return airflow entering the gap flow channel 30a flows into the guide channel 50 and then flows toward the air inlet duct 32a.

[0255] In this embodiment, part of the gap return flow in the gap flow channel 30a flows to the air inlet side of the impeller 31 through the drainage channel 50. On the one hand, the drainage of the gap return flow by the drainage channel 50 can reduce the air flow rate in the gap flow channel 30a, thereby shrinking the eccentric vortex area at the impeller 31, thereby improving the efficiency of the cross-flow fan. At the same time, due to the reduction of the flow rate in the gap flow channel 30a, the abnormal noise at the gap flow channel 30a can be significantly reduced; on the other hand, the gap return flow is sent to the air inlet side of the impeller 31 through the drainage channel 50, which can supplement the air intake of the impeller 31 and improve the air intake efficiency of the cross-flow fan 30.

[0256] Reference Figure 29 and Figure 31 , as can be seen from the figure, Figure 31 After setting the drainage channel 50, compared with Figure 29 The eccentric vortex area (Figure 1) is effectively shrunk, the cross-flow area at the impeller 31 is expanded, and the performance of the cross-flow fan is improved.

[0257] In the present application, the outlet of the guide channel 50 is connected to the air inlet duct 32a, which can greatly reduce the area of ​​the low-pressure vortex region (see Figure II), thereby improving the air intake efficiency of the cross-flow blower 30.

[0258] In some embodiments, continue to refer to Figure 16 The diversion inlet 51 is provided on the windward surface 341a of the volute tongue, and the diversion channel 50 extends from the diversion inlet 51 to the air inlet duct 32a, and is used to guide part of the gap backflow on the windward surface 341a of the volute tongue to the air inlet duct 32a.

[0259] The drainage inlet 51 may be in communication with the starting end of the gap flow channel 30 a , so that the gap backflow is drained at the starting end of the gap flow channel 30 a .

[0260] In some embodiments, the guide channel 30a is arc-shaped. In a cross-section of the crossflow blower 30 perpendicular to the axis of the impeller 31, the guide channel 50 is an arc-shaped channel. This improves the smoothness of the gap backflow flowing through the guide channel 50 and reduces the resistance of the airflow within the guide channel 50.

[0261] 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 close to the drainage inlet 51, and the second drainage segment 542 is close to the drainage outlet 52.

[0262] The first drainage segment 541 may be arc-shaped, and the second drainage segment 542 may extend along a straight line.

[0263] The angle between the first drainage segment 541 and the second drainage segment 542 is not less than 90°, which can prevent the airflow from making a large turn in the drainage channel 50, thereby reducing the flow resistance of the airflow and improving the smoothness of the airflow in the drainage channel 50.

[0264] In some embodiments, the drainage channel 50 is gradually expanded from the drainage inlet 51 to the drainage outlet 52, and the airflow velocity in the drainage channel 50 gradually slows down, which can reduce the impact of this part of the airflow on the normal air intake airflow of the impeller 31.

[0265] In some embodiments, reference Figure 18 , the volute tongue 322 includes a bottom shell body 431.

[0266] The bottom shell body 431 is provided with 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 where the recessed portion is formed is the first drainage wall 531.

[0267] The volute tongue 322 may include a volute tongue splicing piece 432. The volute tongue splicing piece 432 is disposed at the recessed portion, and the volute tongue splicing piece 432 is spaced apart from the bottom shell body 431, and the spaced apart space forms a drainage channel 50.

[0268] The side of the volute tongue assembly 432 facing the first drainage wall 531 is the second drainage wall 532 .

[0269] The two ends of the bottom shell body 431 in the length direction are respectively connected to the side panels of the air duct. The two ends of the volute tongue splicing piece 432 in the length direction are respectively connected to the side panels of the air duct.

[0270] In some embodiments, the drainage inlet 51 of the drainage channel 50 is located at the upper portion of the windward portion 341 of the volute tongue.

[0271] The bottom shell body 431 includes a first air inlet guide portion 4311, a first drainage channel forming portion 4312, a volute tongue tip 343 and a volute tongue air outlet portion 342 which are connected in sequence.

[0272] The first drainage wall surface 531 is a side surface of the first drainage channel forming portion 4312 .

[0273] According to an embodiment of the present application, the volute tongue splicing piece 432 may be hollow, and the interior of the volute tongue splicing piece 432 is penetrated in the length direction.

[0274] The volute tongue assembly piece 432 includes a second air inlet guide portion 4321 , a volute tongue windward portion 341 and a second drainage channel forming portion 4322 connected end to end.

[0275] The second drainage wall surface 532 is a side surface of the second drainage channel forming portion 4322 .

[0276] The first air inlet guide portion 4311 and the second air inlet guide portion 4321 constitute the air inlet guide portion 36 . The space between the first air inlet guide portion 4311 and the second air inlet guide portion 4321 forms the air outlet 52 of the air inlet channel 50 .

[0277] The space between the volute tongue windward portion 341 and the volute tongue tip 343 forms a drainage inlet 51 of the drainage channel 50 .

[0278] In other embodiments, the volute tongue splicing piece 432 may be a solid structure, and the volute tongue splicing piece 432 is a solid rod.

[0279] The outer side surface of the volute tongue assembly 432 includes a second air inlet guide surface 4321 a , a volute tongue windward surface 341 a and a second flow guide wall surface 542 .

[0280] In some embodiments, reference Figure 19 The drainage inlet 51 of the drainage channel 50 is located in the upper middle part of the windward portion 341 of the volute tongue.

[0281] The bottom shell body 431 includes a first air inlet guide portion 4311, a first drainage channel forming portion 4312, a first volute tongue windward portion 4313, a volute tongue tip 343 and a volute tongue air outlet portion 342 which are connected in sequence.

[0282] The volute tongue assembly piece 432 includes a first air inlet guide portion 4321 , a second volute tongue windward portion 3423 and a second drainage channel forming portion 4322 connected end to end.

[0283] The first air inlet guide portion 4311 and the second air inlet guide portion 4321 constitute the air inlet guide portion 36 . The space between the first air inlet guide portion 4311 and the second air inlet guide portion 4321 forms the air outlet 52 of the air inlet channel 50 .

[0284] The second volute tongue windward portion 3423 and the first volute tongue windward portion 4313 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.

[0285] The fourth embodiment of the drainage channel 50 is described below:

[0286] The difference from the third embodiment is that in this embodiment, the drainage outlet 52 is communicated with the gap flow channel 50 .

[0287] The drainage channel 50 is used to guide a portion of the gap reflux in the upstream area of ​​the gap flow channel 30a and then send it to the downstream area of ​​the gap flow channel 30a.

[0288] When the cross-flow blower 30 is in operation, a portion of the gap return flow continues to flow in the gap flow channel 30 a ; another portion of the gap return flow flows into the guide channel 50 and then flows to the downstream area in the gap flow channel 30 a .

[0289] In this embodiment, part of the gap return flow in the gap flow channel 30a flows to the downstream area in the gap flow channel 30a through the diversion channel 50. On the one hand, the diversion channel 50 diverts the gap return flow, which can reduce the air flow rate in the gap flow channel 30a, thereby shrinking the eccentric vortex area at the impeller 31, thereby improving the efficiency of the cross-flow fan. At the same time, due to the reduction of the flow rate in the gap flow channel 30a, the abnormal noise at the gap flow channel 30a can be significantly reduced; on the other hand, the airflow flowing from the diversion channel 50 to the gap flow channel 30a can impact the gap return flow in the gap flow channel 30a, thereby controlling the eccentric vortex and further improving the efficiency of the cross-flow fan 30.

[0290] In some embodiments, the drainage inlet 51 is communicated with the starting end of the gap flow channel 30 a , so that the gap backflow is drained at the starting end of the gap flow channel 30 a .

[0291] The drainage outlet 52 is in communication with the rear end of the gap flow channel 30 a , so that the airflow in the drainage channel 50 impacts the rear side of the gap return flow.

[0292] The fifth embodiment of the drainage channel 50 is described below:

[0293] In some embodiments, reference Figure 20 A drainage channel 50 is provided on the volute tongue 322 , and the drainage channel 50 is used to guide out a portion of the return airflow and then send it to the windward side of the lower part of the heat exchanger 20 .

[0294] When the cross-flow fan 30 is in operation, a portion of the return airflow flows toward the gap flow channel 30 a , and another portion of the return airflow flows into the guide channel 50 and then flows toward the windward side of the lower portion of the heat exchanger 20 .

[0295] In this embodiment, the diversion channel 50 can first divert 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 shrinking the eccentric vortex area at the impeller 31 and improving the efficiency of the cross-flow fan 30; and 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, so that the heat exchange efficiency of the lower part of the heat exchanger 20 is improved.

[0296] In some embodiments, the drainage inlet 51 of the drainage channel 50 is disposed on the windward surface 343 b of the return airflow, and the drainage channel 50 extends from the drainage inlet 51 to the windward space 2122 of the water receiving tray 212 .

[0297] The drainage outlet 52 of the drainage channel 50 is provided on the wind-inlet-side water baffle 2121 of the water receiving tray 212 . The drainage outlet 52 is communicated with the windward space 2122 .

[0298] In some embodiments, based on the direction of airflow in the drainage channel 50, at least the downstream portion of the drainage channel 50 extends downward and toward the heat exchanger 20. This allows the drainage outlet 52 to be located at a lower position, preventing condensed water in the water receiving tray from flowing into the drainage channel 50 through the drainage outlet 52.

[0299] In some embodiments, the drainage channel 50 may include multiple segments connected to each other.

[0300] 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 line segment or an arc segment. The first drainage segment 541 extends gradually downward from the drainage inlet 51 and away from the impeller 31.

[0301] 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 extends downward from an end thereof close to the first drainage segment 541 and toward the heat exchanger 20.

[0302] The first drainage segment 541 and the second drainage segment 542 are connected by an arc segment. The second drainage segment 542 can be a straight line segment, so that the gas in the drainage channel 50 can flow out through a shorter path. In other embodiments, the second drainage segment 542 can be an arc segment with a smaller curvature.

[0303] In some embodiments, the second flow guiding segment 542 changes in a gradually expanding manner along the flow direction of the airflow therein, so that the airflow is continuously decelerated in the second flow guiding segment 542 , thereby enabling this portion of the airflow to fully exchange heat with the heat exchanger 20 .

[0304] In some embodiments, in the height direction, the drainage outlet 52 is positioned higher than the bottom of the heat exchanger 20, and there is a spacing distance between the drainage outlet 52 and the bottom of the heat exchanger 20 to prevent the water level of the condensed water accumulated in the water receiving tray 212 from being higher than the drainage outlet 52 and blocking the drainage outlet 52.

[0305] In some embodiments, the condensed water in the water receiving tray 212 has a preset drainage water level. When the water level of the condensed water reaches the preset drainage water level, the drainage pump is started to pump away the condensed water.

[0306] The distance m from the drainage outlet 52 to the inner bottom wall of the water receiving tray 212 is higher than the preset drainage water level.

[0307] As another embodiment to improve the airflow in the lower portion of the heat exchanger 20:

[0308] Reference Figure 21 The diversion channel 50 is used to send part of the outgoing air flow to the windward side of the lower part of the heat exchanger 20.

[0309] When the cross-flow fan 30 is in operation, most of the outlet air flow still flows toward the outlet side through the outlet air duct 32 c , and a small portion of the outlet air flow flows into the guide channel 50 .

[0310] The outgoing air flow in the drainage channel 50 flows toward the lower portion of the heat exchanger 20 through the drainage outlet 52 , thereby improving the heat exchange effect of the lower portion of the heat exchanger 20 .

[0311] The drainage inlet 51 of the drainage channel 50 is disposed on the air outlet surface 342 a of the volute tongue.

[0312] The sixth embodiment of the drainage channel 50 is described below:

[0313] In some embodiments, reference Figure 22The plurality of drainage channels 50 may include a first drainage channel 561. The first drainage channel 561 sends part of the outgoing air flow to the windward side of the lower portion of the heat exchanger 20.

[0314] The drainage inlet 51 of the first drainage channel 561 is provided on the volute tongue air outlet surface 342 a , and the drainage outlet 52 of the first drainage channel 561 is provided on the air inlet side water baffle 2121 of the water receiving tray 212 .

[0315] In this embodiment, the first drainage channel 561 can improve the heat exchange effect of the lower portion of the heat exchanger 20 .

[0316] The plurality of drainage channels 50 include a second drainage channel 562 .

[0317] The inlet 51 of the second flow channel 562 is located in the flow inlet region of the volute tongue 322. The outlet 52 of the second flow channel 562 is located in the flow outlet region.

[0318] In some embodiments, the inlet 51 of the second guide channel 562 is disposed on the return airflow windward surface 343b, and the outlet 52 of the second guide channel 562 is disposed on the volute tongue windward surface 341a and relatively close to the air inlet guide surface 36a.

[0319] In this embodiment, the second guide channel 562 can guide the return airflow, thereby reducing the gap backflow flow and improving the pressure resistance of the crossflow blower. The outlet airflow of the second guide channel 562 can also impact the gap backflow, thereby controlling the eccentric vortex and further improving the pressure resistance of the crossflow blower.

[0320] In some embodiments, on a cross-section of the cross-flow blower 30 perpendicular to the axis of the impeller 31, lines n5 and n6 are defined to be parallel to the second direction, and the second drainage channel 562 is located between line n5 and line n6. The distance between line n5 and line n6 is less than 2*W4, where W4 is the maximum width of the second drainage channel 562.

[0321] 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, preventing it from occupying too much space in the first direction. Furthermore, the length of the second drainage channel 562 can be shortened, thereby improving the drainage efficiency of the second drainage channel 562.

[0322] The following describes a seventh embodiment of the drainage channel 50:

[0323] In some embodiments, reference Figure 23 and Figure 24The drainage channel 50 may have a plurality of drainage channels. The drainage inlet 51 of the drainage channel 50 is provided in the drainage air inlet region of the volute tongue 322. The drainage outlet 52 of the drainage channel 50 is provided in the drainage air outlet region.

[0324] The drainage channel 50 includes a first drainage channel 561. The first drainage channel 561 is used to guide part of the return airflow to the gap flow channel 30a.

[0325] In some embodiments, the first guide channel 561 connects the upstream side 30b of the gap flow channel 30a with the gap flow channel 30a.

[0326] The inlet 51 of the first guide channel 561 is provided on the return airflow windward surface 343a, and the outlet 52 of the first guide channel 561 is provided on the volute tongue windward surface 341a and relatively close to the air inlet guide surface 36a.

[0327] The guide channel 50 includes a second guide channel 562. The second guide channel 562 is used to guide part of the return airflow to the air inlet duct 32a.

[0328] The second guide channel 562 is farther away from the impeller 31 than the first guide channel 561. The second guide channel 562 connects the upstream side 30b of the gap channel 30a with the air inlet channel 32a.

[0329] The inlet 51 of the second guide channel 562 is provided on the return airflow windward surface 343 a , and the outlet 52 of the second guide channel 562 is provided on the air inlet guide surface 36 a .

[0330] The first guide channel 561 guides out a portion of the return airflow and then sends it to the rear side of the gap channel 30a. The second guide channel 562 guides out a portion of the return airflow and then sends it to the air inlet channel 32a.

[0331] In this embodiment, the first drainage channel 561 and the second drainage channel 562 can both guide out part of the return airflow, thereby reducing the gap return flow flowing into the gap flow channel 30a and improving the pressure resistance of the cross-flow blower.

[0332] At the same time, the outlet airflow of the first guide channel 561 can also impact the gap backflow, thereby controlling the eccentric vortex and further improving the pressure resistance of the cross-flow fan.

[0333] At the same time, the outlet airflow of the second guide channel 562 can also improve the air intake efficiency of the impeller.

[0334] In some embodiments, on a cross-section of the crossflow blower 30 perpendicular to the axis of the impeller 31, lines n5 and n6 are defined parallel to the second direction, and the first drainage channel 561 is located between lines n5 and n6. A point on the first drainage channel 561 is located on line n5, and a point on the first drainage channel 561 is located on line n6.

[0335] 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 .

[0336] This allows the first drainage channel 561 to be compact in the first direction, preventing it from occupying too much space in the first direction, thereby allowing the first drainage channel 561 and the second drainage channel 562 to be arranged separately. Furthermore, the length of the first drainage channel 561 can be shortened, thereby improving the drainage efficiency of the first drainage channel 561 for the return airflow.

[0337] In some embodiments, a side wall defining the first diversion channel 561 is transitionally connected to the windward surface 341a of the volute tongue at the diversion inlet 51 through a first arc surface 391, and a side wall defining the second diversion channel 562 is transitionally connected to the wind outlet surface 342a of the volute tongue at the diversion inlet 51 through a second arc surface 392.

[0338] On a cross-section of the cross-flow blower 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; and the angle θ1 between line n1 and the X-axis is greater than the angle θ2 between line n2 and the X-axis.

[0339] The eighth embodiment of the drainage channel 50 is described below:

[0340] In some embodiments, reference Figure 25 The guide channel 50 may have multiple guide channels. The difference from the seventh embodiment is the second guide channel 562. The second guide channel 562 is used to guide part of the return airflow to the windward side of the lower part of the heat exchanger 20.

[0341] The drainage outlet 52 of the second drainage channel 562 is provided on the air inlet-side water baffle 2121 and communicates with the windward space 2122 of the water receiving tray 212 .

[0342] In this embodiment, the first drainage channel 561 and the second drainage channel 562 can both guide the return airflow, thereby reducing the gap backflow flowing into the gap flow channel 30a and improving the pressure resistance of the cross-flow blower.

[0343] At the same time, the outlet airflow of the first guide channel 561 can also impact the gap backflow, thereby controlling the eccentric vortex and further improving the pressure resistance of the crossflow blower. At the same time, the outlet airflow of the second guide channel 562 can also improve the heat exchange efficiency of the lower part of the heat exchanger 20.

[0344] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0345] For ease of explanation, the above description has been presented 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. Based on the above teachings, various modifications and variations are possible. The above embodiments have been selected and described to better explain the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An air conditioner indoor unit, characterized in that: include: case; a heat exchanger, disposed in the shell; A water receiving tray is provided below the heat exchanger, the space in the water receiving tray located on the windward side of the heat exchanger is the windward space, and the portion of the heat exchanger located in the water receiving tray is the lower portion of the heat exchanger; The volute and the volute tongue are both arranged in the shell, an air inlet duct is formed between the volute tongue and the shell, and the volute tongue is connected to the volute to form an impeller mounting cavity and an air outlet duct; an impeller, disposed in the impeller mounting cavity and located between the air inlet duct and the air outlet duct; Driven by the impeller, air passes through the air inlet duct and the impeller mounting cavity in sequence to form an outlet airflow; the outlet airflow includes a return airflow flowing to the impeller and an outlet airflow flowing to the outlet air duct, and the outlet airflow exchanges heat with the heat exchanger; Wherein, the snail tongue comprises: The air inlet guide surface forms the air inlet duct with the shell; The windward surface of the volute tongue is opposite to the impeller, and the gap between the windward surface of the volute tongue and the outer peripheral surface of the impeller forms a gap flow channel, and the gap flow channel is used to guide the return airflow; The air outlet surface of the volute tongue forms the air outlet duct with the volute; The tip surface of the volute tongue is connected between the windward surface of the volute tongue and the wind outlet surface of the volute tongue; A first drainage channel is provided on the volute tongue, and a drainage inlet of the first drainage channel is provided on the wind outlet surface of the volute tongue. The first drainage channel extends from its drainage inlet toward the windward space, and is used to guide a portion of the outlet airflow on the wind outlet surface of the volute tongue to the lower part of the heat exchanger.

2. The air conditioner indoor unit according to claim 1, characterized in that: The volute tongue includes a volute tongue air outlet portion, and the volute tongue air outlet surface is located on the volute tongue air outlet portion; The water receiving tray has an air inlet side water baffle located on the windward side of the heat exchanger, and the air inlet side water baffle is connected to the volute tongue air outlet; The drainage outlet of the first drainage channel is arranged on the air inlet side water baffle and is open toward the windward space.

3. The air conditioner indoor unit according to claim 2, characterized in that: An extension line Lp3 of the drainage outlet of the first drainage channel intersects with the lower portion of the heat exchanger.

4. The air conditioner indoor unit according to claim 2, characterized in that: A distance m between the drainage outlet of the first drainage channel and the inner bottom wall of the water receiving tray is higher than a preset drainage water level of the water receiving tray.

5. The air conditioner indoor unit according to any one of claims 1 to 4, characterized in that: The snail tongue tip surface comprises: An outlet airflow windward surface, used for guiding the outlet airflow to flow toward the outlet air duct; a return airflow windward surface, connected between the outlet airflow windward surface and the volute tongue windward surface, and used for guiding a portion of the return airflow on the return airflow windward surface to flow toward the gap flow channel; A second drainage channel is provided on the volute tongue, and the drainage inlet of the second drainage channel is provided on the windward surface of the return airflow. The second drainage channel extends from its drainage inlet to the gap flow channel, and is used to guide a portion of the return airflow on the windward surface of the return airflow to the gap flow channel.

6. The air conditioner indoor unit according to claim 5, characterized in that: The boundary line between the outlet airflow and the return airflow formed after the outlet airflow is guided and divided 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 outflow airflow are respectively located on both sides of the velocity cut-off line Co; The drainage inlet of the second drainage channel is located on the side of the velocity cut-off line Co close to the impeller, and the drainage outlet of the second drainage channel is arranged on the windward surface of the volute tongue.

7. The air conditioner indoor unit according to claim 6, characterized in that: On the cross section of the air-conditioning indoor unit 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 the circle with the axis O of the impeller as the center and the radius of R+W0+2W2.

8. The air conditioner indoor unit according to claim 7, characterized in that: In the radial direction of the impeller, the distance between one end of the windward surface of the volute tongue connected to the tip surface of the volute tongue and the impeller is W1, and the distance L from the drainage inlet of the second drainage channel to the axis O of the impeller satisfies R+W1≤L.

9. The air conditioner indoor unit according to claim 5, characterized in that: The end of the gap flow channel away from the tongue tip surface of the volute tongue is the tail end of the gap flow channel, and the drainage outlet of the second drainage channel is toward the tail end of the gap flow channel.

10. An air conditioner indoor unit, characterized in that: include: case; a heat exchanger located in the shell; A water receiving tray is provided below the heat exchanger, and the portion of the heat exchanger located within the water receiving tray is the lower portion of the heat exchanger; The volute and the volute tongue are both arranged in the shell, an air inlet duct is formed between the volute tongue and the shell, and the volute tongue is connected to the volute to form an impeller mounting cavity and an air outlet duct; an impeller, disposed in the impeller mounting cavity and located between the air inlet duct and the air outlet duct; Driven by the impeller, air passes through the air inlet duct and the impeller mounting cavity in sequence to form an outlet airflow; the outlet airflow includes a return airflow flowing to the impeller and an outlet airflow flowing to the outlet air duct, and the outlet airflow exchanges heat with the heat exchanger; A first drainage channel is provided on the volute tongue, and the first drainage channel connects the air outlet duct with the windward side of the lower part of the heat exchanger; When the impeller rotates, a portion of the outlet air flow flows toward the heat exchanger through the outlet air duct, and a portion of the outlet air flow flows toward the lower portion of the heat exchanger through the first guide channel.

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