Cross-flow fan and air conditioner

Abstract

The invention provides a cross-flow fan and an air conditioner, and belongs to the technical field of air conditioners. The cross-flow fan comprises a shell, a volute, a volute tongue and a cross-flow impeller. The volute and the volute tongue are both connected with the shell, the volute tongue is provided with a flow guide face, an air inlet channel is formed between the rear edge area of the flow guide face and the volute, and an air exhaust channel is formed between the front edge area of the flow guide face and the volute. The cross-flow impeller is located in the volute and rotationally connected with the shell. The front edge area of the flow guide face is provided with a first middle part and two first end parts in the direction parallel to the axis of the cross-flow impeller, and the first distance between the first middle part and the volute is smaller than the second distance between the first end parts and the volute. By the adoption of the cross-flow fan, the uniformity of gas flowing is improved, and then the overall performance of the cross-flow fan is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioners, and particularly to a cross-flow fan and an air conditioner. Background Art

[0002] A cross-flow fan includes a housing, a volute, a volute tongue, and a cross-flow impeller. Generally, an air inlet passage and an air outlet passage are formed between the volute and the volute tongue. Gas enters the air inlet passage under the action of the cross-flow impeller, and after encountering the volute tongue, it is guided along the surface of the volute tongue to the air outlet passage for further processing.

[0003] The volute, the volute tongue, and the cross-flow impeller are all installed in the housing. Since the gaps between the two ends of the volute tongue and the housing are small or even zero, the housing will cause a certain obstruction to the gas flowing through the two ends of the volute tongue, resulting in the gas velocity at the two ends of the volute tongue being lower than that at the middle part of the volute tongue, reducing the uniformity of gas flow, and thus reducing the overall performance of the cross-flow fan. Summary of the Invention

[0004] Embodiments of the present disclosure provide a cross-flow fan and an air conditioner, which can solve the technical problems existing in the related art. The technical solutions of the cross-flow fan and the air conditioner are as follows:

[0005] On the one hand, an embodiment of the present disclosure provides a cross-flow fan, characterized in that the cross-flow fan includes a housing, a volute, a volute tongue, and a cross-flow impeller;

[0006] Both the volute and the volute tongue are connected to the housing. The volute tongue has a guiding surface. An air inlet passage is formed between the trailing edge region of the guiding surface and the volute, and an air outlet passage is formed between the leading edge region of the guiding surface and the volute;

[0007] The cross-flow impeller is located in the volute and is rotatably connected to the housing;

[0008] The leading edge region of the guiding surface has a first middle part and two first end parts in the direction parallel to the axis of the cross-flow impeller. A first distance between the first middle part and the volute is smaller than a second distance between the first end part and the volute.

[0009] In a possible implementation manner, the shapes of the leading edge region in a first cross-section and a second cross-section are a first arc and a second arc respectively. The shapes of the first arc and the second arc are the same. A third distance between a first point on the first arc and the axis of the cross-flow impeller is equal to a fourth distance between a second point on the second arc and the axis of the cross-flow impeller. Among them, both the first cross-section and the second cross-section are perpendicular to the axis of the cross-flow impeller, and the first cross-section is located on the side close to the first middle part of the second cross-section. The positions of the first point and the second point correspond to each other.

[0010] In a possible implementation, a middle region of the guide surface has a second middle part and two second end parts in a direction parallel to the axis of the cross-flow impeller, and a fifth distance between the second middle part and the volute is less than a sixth distance between the second end part and the volute.

[0011] In a possible implementation, shapes of the middle region of the guide surface on the first section and the second section are a third arc and a fourth arc respectively, shapes of the third arc and the fourth arc are the same, and a seventh distance between a third point on the third arc and the axis of the cross-flow impeller is equal to an eighth distance between a fourth point on the fourth arc and the axis of the cross-flow impeller, wherein positions of the third point and the fourth point correspond to each other.

[0012] In a possible implementation, the volute tongue further has a windward surface, the windward surface is connected to the leading edge region, and an exhaust passage is jointly formed between the windward surface and the volute and between the leading edge region and the volute;

[0013] The windward surface has a third middle part and two third end parts in a direction parallel to the axis of the cross-flow impeller, and a ninth distance between the third middle part and the volute is less than a tenth distance between the third end part and the volute.

[0014] In a possible implementation, a shortest distance between the leading edge region and a circumference where an outer diameter of the cross-flow impeller is located is a*D, a shortest distance between the trailing edge region and the circumference where the outer diameter of the cross-flow impeller is located is b*D, and a radius of the first arc is equal to c*D, wherein a value range of a is [0.05, 0.07], a value range of b is [0.03, 0.05], a value range of c is [0.05, 0.07], and D is the outer diameter of the cross-flow impeller.

[0015] In a possible implementation, the volute tongue further has a return passage, an air inlet of the return passage is communicated with the exhaust passage, and an air outlet of the return passage is communicated with the air inlet passage.

[0016] In a possible implementation, the volute tongue further has a leeward surface, the leeward surface is connected to the trailing edge region, and an air inlet passage is jointly formed between the leeward surface and the housing and between the trailing edge region and the volute;

[0017] The air outlet of the return passage is located on the leeward surface.

[0018] In a possible implementation, a circumference where the outer diameter of the cross-flow impeller is located is tangent to an air outlet direction of the air outlet of the return passage.

[0019] In a possible implementation, the volute tongue further has a windward surface, the windward surface is connected to the leading edge region, and the windward surface and the volute, and the leading edge region and the volute together form the exhaust passage;

[0020] The air inlet of the return channel is located on the windward surface, the shortest distance between the air inlet of the return channel and the leading edge area is e*D, and the shortest distance between the air outlet of the return channel and the trailing edge area is f*D, wherein the value range of e is [0.15, 0.3], the value range of f is [0.1, 0.15], and D is the outer diameter of the crossflow impeller.

[0021] In a possible implementation, the angle between the air intake direction of the reflow channel and the portion of the windward surface close to the leading edge region is in the range of [45 degrees, 90 degrees].

[0022] On the other hand, an embodiment of the present disclosure provides an air conditioner, the air conditioner comprising a cross-flow fan as described in any one of the above items.

[0023] The technical solution provided by the embodiments of the present disclosure includes at least the following beneficial effects:

[0024] The disclosed embodiment provides a cross-flow fan, wherein the first distance between the first middle portion of the leading edge region and the volute is smaller than the second distance between the first end portion of the leading edge region and the volute, so that the first middle portion of the leading edge region forms an inclined surface toward the first ends on both sides, increasing the cross-sectional area of ​​the exhaust passage at the first end portion, so that the high-speed gas at the first middle portion can flow toward the two ends through the inclined surface, thereby increasing the gas flow rate at the two first ends, reducing the difference between the gas flow rate at the first end portion and the gas flow rate at the first middle portion, improving the uniformity of the gas flow, and thereby improving the overall performance of the cross-flow fan.

[0025] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and cannot limit the present disclosure. Brief Description of the Figures

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a cross-sectional schematic diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0028] Figure 2 It is a schematic structural diagram of a volute tongue shown in an embodiment of the present disclosure;

[0029] Figure 3 It is a schematic structural diagram of a volute tongue shown in an embodiment of the present disclosure;

[0030] Figure 4 It is a schematic structural diagram of a volute casing, a volute tongue and a cross-flow impeller shown in an embodiment of the present disclosure;

[0031] Figure 5 It is a schematic structural diagram of a volute tongue and a cross-flow impeller shown in an embodiment of the present disclosure.

[0032] Legend Explanation

[0033] 1. Housing; 2. Volute casing; 3. Volute tongue; 4. Cross-flow impeller; 5. Heat exchanger;

[0034] 31. Flow guiding surface; 32. Windward surface; 33. Return channel; 34. Leeward surface;

[0035] 31a. Trailing edge region; 31b. Leading edge region; 31c. Middle region;

[0036] 31b1. First intermediate part; 31b2. First end part;

[0037] A. Air inlet channel; B. Air outlet channel;

[0038] L1. First distance; L2. Second distance; L3. Third distance; L4. Fourth distance;

[0039] S1. First cross-section; S2. Second cross-section. Detailed Embodiment

[0040] The technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second", "third" and similar terms used in the specification and claims of this patent application of the disclosure do not denote any order, quantity or importance, but are merely used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. Terms such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0041] To make the objectives, technical solutions and advantages of this application more clear, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0042] The embodiments of this disclosure provide a cross-flow fan. Refer to Figure 1 , the cross-flow fan includes a housing 1, a volute 2, a volute tongue 3 and a cross-flow impeller 4.

[0043] Among them, the housing 1 can be of any reasonable shape. For example, it can have a cuboid shape or a cylindrical shape, etc., and the embodiments of this disclosure do not limit this.

[0044] The volute 2 is located in the housing 1 and is connected to the housing 1. In a possible implementation, the volute 2 and the housing 1 can be an integrally formed structure, or can be two structures connected by a reasonable connection method, and the connection method can be any reasonable method. For example, it can be connected by a snap structure, or can be threadedly connected by bolts, etc., and the embodiments of this disclosure do not limit this.

[0045] The volute tongue 3 is located in the housing 1 and is connected to the housing 1. In a possible implementation, the volute tongue 3 and the housing 1 can be an integrally formed structure, or can be two structures connected by a reasonable interception method, and the connection method can be any reasonable method. For example, it can be connected by a snap structure, or can be threadedly connected by bolts, etc., and the embodiments of this disclosure do not limit this.

[0046] The volute tongue 3 has a guiding surface 31. An air inlet passage A is formed between the trailing edge region 31a of the guiding surface 31 and the volute 2, and an air outlet passage B is formed between the leading edge region 31b of the guiding surface 31 and the volute 2.

[0047] Among them, the flow guiding surface 31 can be a surface with any reasonable shape. For example, Figure 1 the flow guiding surface 31 shown in

[0048] is an arc surface. Of course, the flow guiding surface 31 can also be a plane or a spliced surface of an arc surface and a plane, etc. The embodiments of the present disclosure do not limit this.

[0049] The cross-flow impeller 4 is located inside the volute 2 and is rotationally connected to the housing 1. In this way, when the cross-flow impeller 4 rotates, it can drive the gas to flow along the rotation direction of the cross-flow impeller 4, thereby guiding the gas from the air inlet passage A to the exhaust passage B.

[0050] The cross-flow impeller 4 is located between the volute 2 and the volute tongue 3. When the cross-flow impeller 4 rotates, it can drive the gas to flow along the passage formed between the volute 2 and the volute tongue 3.

[0051] Furthermore, the cross-flow impeller 4 can be located between the volute 2 and the flow guiding surface 31. In this way, the flow guiding surface 31 can more accurately guide the air flow, making it flow to the exhaust passage B more stably.

[0052] In a possible implementation manner, the flow guiding surface 31 can be an arc surface that bulges in a direction away from the axis of the cross-flow impeller 4. In this way, while ensuring that the gap between the flow guiding surface 31 and the circumference where the outer diameter of the cross-flow impeller 4 is located is within a relatively small gap range, the guiding effect of the volute tongue 3 on the gas is improved, thereby improving the overall performance of the cross-flow fan.

[0053] See Figure 2 、 Figure 3 and Figure 4 In

[0054] Figure 4 Figure 4 Figure 4It can be seen that the first distance L1 is smaller than the second distance L2. Thus, the first middle portion 31b1 of the leading edge region 31b forms an inclined surface toward the first ends 31b2 on both sides, increasing the cross-sectional area of ​​the exhaust passage B at the first ends 31b2, so that the high-speed gas at the first middle portion 31b1 can flow toward both ends through the inclined surface, thereby increasing the gas flow rate at the two first ends 31b2, reducing the difference between the gas flow rate at the first end 31b2 and the gas flow rate at the first middle portion 31b1, improving the uniformity of the gas flow, and thereby improving the overall performance of the crossflow fan.

[0055] In the embodiment of the present disclosure, there may be many possibilities for the structure in which the first distance L1 is smaller than the second distance L2. Several possible structures are introduced below:

[0056] In a possible implementation, the shapes of the leading edge region 31b on the first section S1 and the second section S2 are respectively the first arc line and the second arc line, and the shapes of the first arc line and the second arc line are the same, wherein the first section S1 and the second section S2 are both perpendicular to the axis of the crossflow impeller 4, and the first section S1 is located on the side of the second section S2 close to the first middle portion 31b1, that is, the first section S1 is closer to the first middle portion 31b1 of the volute tongue 31 than the second section S2.

[0057] It can be understood that the first cross section S1 and the second cross section S2 here can be any cross section that meets the above requirements, and the embodiment of the present disclosure does not specifically limit this. For example, see Figure 3 , Figure 3 Yes Figure 1 The right side view of the volute tongue 3 in the crossflow blower shown in the figure shows, by way of example, a first section S1 and a second section S2 that meet the above requirements.

[0058] The third distance L3 between the first point on the first arc and the axis of the crossflow impeller 4 is equal to the fourth distance L4 between the second point on the second arc and the axis of the crossflow impeller 4, wherein the positions of the first point and the second point correspond.

[0059] Since the shape of the first arc is the same as that of the second arc, any point on the first arc corresponds to a point on the second arc. It can be understood that the first point and the second point can be any two corresponding points on the first arc and the second arc.

[0060] See also Figure 4 , it can be seen that the first arc is the projection arc corresponding to the first middle part 31b1, and the second arc is the projection arc corresponding to the first end part 31b2. By way of example, the third distance L3 between the first point and the axis of the crossflow impeller 4 and the fourth distance L4 between the corresponding second point and the crossflow impeller 4 are also shown, and L3 is equal to L4.​​

[0061] It can also be seen that the first distance L1 between the first arc and the volute 2 is smaller than the second distance L2 between the second arc and the volute 2. Thus, an inclined plane relative to the axis of the crossflow impeller 4 is formed between the first middle portion 31b1 and the first end portion 31b2. The high-speed gas at the first middle portion 31b1 can disperse and flow toward both ends through the inclined plane, thereby improving the uniformity of the gas flow and thus improving the overall performance of the crossflow fan. At the same time, since the third distance L3 from the first point on the first arc to the axis of the crossflow impeller 4 is equal to the fourth distance L4 from the corresponding second point on the second arc to the axis of the crossflow impeller 4, the gap between the leading edge region 31b and the crossflow impeller 4 remains unchanged. Thus, in order to improve the uniformity of the gas flow, the gap between the leading edge region 31b and the crossflow impeller 4 will not be enlarged, thereby causing an adverse effect on the gas flow (for example, problems such as eccentric vortex instability).

[0062] In summary, the first distance L1 is smaller than the second distance L2, and the third distance L3 is equal to the fourth distance L4, so that the crossflow blower provided by the embodiment of the present disclosure improves the uniformity of gas flow while ensuring the stability of gas flow, thereby improving the overall performance of the crossflow blower.

[0063] Besides, since the line connecting the first point and the second point is no longer parallel to the axial direction of the crossflow impeller 4, the positions of the two points are staggered, so that the force exerted by the high-speed airflow flowing out of the crossflow impeller 4 on the leading edge area 31b along the axial direction is staggered by a certain time and phase, thereby weakening the superposition effect of noise and reducing the noise of the crossflow fan.

[0064] See also Figure 4 For the above structure, it can also be considered that the second point is rotated by an angle α around the axis of the crossflow impeller 4 in the rotation direction of the crossflow impeller 4 relative to the first point, so that the first distance L1 is smaller than the second distance L2, and the third distance L3 is equal to the fourth distance L4.

[0065] In a possible implementation, on the basis of the above, the middle area 31c of the guide surface 31 has a second middle part and two second ends in the direction parallel to the axis of the crossflow impeller 4, and the fifth distance between the second middle part and the volute 2 is smaller than the sixth distance between the second end and the volute 2. In this way, when the gas flows from the air inlet channel A to the exhaust channel B driven by the crossflow impeller 4 and guided by the middle area 31c, since the fifth distance is smaller than the sixth distance, the second middle part of the middle area 31c forms an inclined surface toward the second ends on both sides, increasing the ventilation area at the second ends, so that the high-speed gas at the second middle part can disperse and flow toward the two ends through the inclined surface, thereby increasing the gas flow rate at the two second ends, further improving the uniformity of the gas flow, and thus improving the overall performance of the crossflow fan.

[0066] For the implementation of the fifth distance being less than the sixth distance, in a possible implementation, it can be as follows: the shapes of the middle area 31c of the guide surface 31 on the first section S1 and the second section S2 are the third arc and the fourth arc respectively, the third arc has the same shape as the fourth arc, the seventh distance between the third point on the third arc and the axis of the crossflow impeller 4 is equal to the eighth distance between the fourth point on the fourth arc and the axis of the crossflow impeller 4, wherein the positions of the third point and the fourth point correspond.

[0067] In this way, the gap between the middle area 31c and the crossflow impeller 4 remains unchanged, which ensures the stability of the gas flow and further improves the uniformity of the gas flow, thereby improving the overall performance of the crossflow fan.

[0068] Besides, since the line connecting the third point and the fourth point is no longer parallel to the axial direction of the crossflow impeller 4, the positions of the two points are staggered, so that the force exerted by the high-speed airflow flowing out of the crossflow impeller 4 on the middle area 31c along the axial direction is staggered by a certain time and phase, thereby weakening the superposition effect of noise and reducing the noise of the crossflow fan.

[0069] See also Figure 4 ( Figure 4 The third arc and the fourth arc are not numbered in the figure), and it can also be considered that the fourth point is rotated around the axis of the crossflow impeller 4 and in the rotation direction of the crossflow impeller 4 by a certain angle relative to the third point, so that the fifth distance is smaller than the sixth distance and the seventh distance is equal to the eighth distance. The rotation angle may be equal to the above-mentioned angle α or may not be equal, and the embodiments of the present disclosure do not limit this.

[0070] In a possible implementation, based on any of the above structures, the following configuration can be performed: the volute tongue 3 also has a windward surface 32, the windward surface 32 is connected to the leading edge area 31b, and an exhaust passage B is formed between the windward surface 32 and the volute 2, and between the leading edge area 31b and the volute 2, that is, a section of the exhaust passage B is formed between the leading edge area 31b and the volute 2, and another section of the exhaust passage B connected to the volute 2 is formed between the windward surface 32 and the volute 2.

[0071] The windward surface 32 has a third middle portion and two third ends in a direction parallel to the axis of the crossflow impeller 4. The ninth distance between the third middle portion and the volute 2 is smaller than the tenth distance between the third end and the volute 2. Thus, the third middle portion of the windward surface 32 forms an inclined surface toward the third ends on both sides, increasing the cross-sectional area of ​​the exhaust passage B at the third ends, so that the high-speed gas at the third middle portion can flow toward the two ends through the inclined surface, thereby increasing the gas flow rate at the two third ends, further improving the uniformity of the gas flow, and thus improving the overall performance of the crossflow fan.

[0072] Moreover, the connecting line of corresponding points on different cross sections is no longer parallel to the axial direction of the crossflow impeller 4, and the positions of the two are staggered, so that the force exerted by the high-speed airflow from the crossflow impeller 4 on the volute tongue 3 along the axial direction is staggered by a certain time and phase, thereby weakening the superposition effect of noise and reducing the noise of the crossflow fan.

[0073] For the implementation of the ninth distance being less than the tenth distance, in a possible implementation, it can be as follows: the shapes of the windward surface 32 on the first section S1 and the second section S2 are respectively the first line segment and the second line segment, the shapes of the first line segment and the second line segment are the same, the eleventh distance between the fifth point on the first line segment and the axis of the crossflow impeller 4 is equal to the twelfth distance between the sixth point on the second line segment and the axis of the crossflow impeller 4, wherein the positions of the fifth point and the sixth point correspond.

[0074] See also Figure 4 ( Figure 4 The first and second line segments are not numbered in the figure), and it can also be considered that the sixth point is rotated around the axis of the crossflow impeller 4 and in the rotation direction of the crossflow impeller 4 by a certain angle relative to the fifth point, so that the fifth distance is smaller than the sixth distance, and the seventh distance is equal to the eighth distance. The rotation angle may be equal to the above-mentioned angle α, or may not be equal, and the embodiment of the present disclosure does not limit this.

[0075] In one possible implementation, see Figure 3 , exemplary, in Figure 3Among the cross-sections P1, P2, P3, P4, and P5 shown, compared with the leading-edge region 31b, the middle region 31c, and the windward surface 32 in the cross-section P1, the leading-edge region 31b, the middle region 31c, and the windward surface 32 in the cross-sections P2 and P4 are rotated 1 degree to 3 degrees in the rotation direction of the cross-flow impeller 4, and the leading-edge region 31b, the middle region 31c, and the windward surface 32 in the cross-sections P3 and P5 are rotated 3 degrees to 5 degrees in the rotation direction of the cross-flow impeller 4. Then, the cross-sections P1, P2, P3, P4, and P5 are connected by a smooth curved surface to form the volute tongue 3, and the whole volute tongue 3 is symmetric about the cross-section P1. Experiments prove that the volute tongue 3 of the current structure has good effects on the stability and uniformity of gas flow.

[0076] In summary, the structure of the above volute tongue 3 forms a crescent-shaped volute tongue, which can disperse a part of the high-speed air flow in the middle towards the end parts on both sides, increasing the air flow velocity at both ends and improving the overall uniformity of the air flow at the exhaust passage B.

[0077] Moreover, since the connection line between the first point and the second point is no longer parallel to the axis direction of the cross-flow impeller 4 and their positions are offset, the acting force exerted by the high-speed air flow flowing out of the cross-flow impeller 4 on the volute tongue 3 in the axis direction is offset by a certain time and phase, thereby weakening the superposition effect of the noise and reducing the noise of the cross-flow fan.

[0078] In a possible implementation manner, in addition to the above-mentioned crescent-shaped volute tongue structure, the implementation structure for realizing that the first distance L1 is less than the second distance L2 can also be: setting the first middle part and the first end part of the leading-edge region 31b as concave-convex structures or stepped structures, etc., such that the first distance L1 between the first middle part and the volute 2 is less than the second distance between the first end part and the volute 2. Or, it can also be any other reasonable implementation structure, and the embodiments of the present disclosure do not limit this.

[0079] In a possible implementation manner, referring to Figure 5 , the shortest distance H1 between the leading-edge region 31b and the circumference where the outer diameter of the cross-flow impeller 4 is located is a*D, the shortest distance H2 between the trailing-edge region 31a and the circumference where the outer diameter of the cross-flow impeller 4 is located is b*D, and the radius R1 of the first arc is equal to c*D, where a, b, and c are all positive numbers, and D is the outer diameter of the cross-flow impeller 4.

[0080] In a possible implementation manner, the value range of a is [0.05, 0.07], the value range of b is [0.03, 0.05], the value range of c is [0.05, 0.07], and the units of a, b, and c are millimeters. For example, a can be 0.06 millimeters, b can be 0.04 millimeters, and c can be 0.06 millimeters.

[0081] Experiments have proved that the air flow of the cross-flow fan within the above-mentioned value range is relatively stable, which is conducive to stabilizing the position of the eccentric vortex generated when the cross-flow impeller 4 is working. Even when the cross-flow fan is under a relatively large system resistance (for example, when the air inlet passage A or the air outlet passage B is blocked), the cross-flow fan has better compressive resistance, reducing the possibility of air flow velocity loss and avoiding the generation of noise.

[0082] In the embodiments of the present disclosure, referring to Figure 1 , on the basis of any of the above-mentioned cross-flow fans, the volute tongue 3 may further have a return channel 33. The air inlet of the return channel 33 is communicated with the air outlet passage B, and the air outlet of the return channel 33 is communicated with the air inlet passage A.

[0083] In this way, by setting the air outlet of the return channel 33 to communicate with the air inlet passage A, a part of the gas in the air outlet passage B can flow to the air outlet through the return channel 33. This gas can play a certain control role on the gas around the cross-flow impeller 4 at the air inlet passage A, making the position of the eccentric vortex generated when the cross-flow impeller 4 is working more stable, thereby improving the compressive resistance of the cross-flow fan and reducing or even avoiding the generation of noise.

[0084] Moreover, since the first distance L1 between the first intermediate part 31b1 and the volute 2 in the embodiments of the present disclosure is less than the second distance L2 between the first end part 31b2 and the volute 2, the flow velocity of the gas reflux at the positions near both ends in the return channel 33 is increased, improving the flow uniformity of the reflux gas in the middle and at the ends of the return channel 33, thereby further improving the stability of the eccentric vortex.

[0085] In a possible implementation manner, referring to Figure 1 , the volute tongue 3 further has a leeward surface 34. The leeward surface 34 is connected to the trailing edge region 31a, and the air inlet passage A is jointly formed between the leeward surface 34 and the housing 1 and between the trailing edge region 31a and the volute 2. The air outlet of the return channel 33 is located on the leeward surface 34.

[0086] In a possible implementation manner, the circumference where the outer diameter of the cross-flow impeller 4 is located is tangent to the air outlet direction of the air outlet of the return channel 33. Referring to the dashed line in Figure 1 , it can be seen that the air outlet direction of the air outlet of the return channel 33 is tangent to the circumference where the part of the cross-flow impeller 4 located in the air inlet passage A is located. In this way, the position of the eccentric vortex can be further stabilized ( Figure 1 exemplarily shows the approximate position of the eccentric vortex in ). The gas flowing out of the air outlet of the return channel 33 is directed towards the tangent direction of the circumference where the outer diameter of the cross-flow impeller 4 is located, which can perform a certain direction control on the gas entering the cross-flow impeller 4, making the position of the eccentric vortex relatively stable, thereby improving the compressive resistance of the cross-flow fan and reducing or even avoiding the generation of noise.

[0087] In a possible implementation, the volute tongue 3 further has a windward surface 32, which is the same as the description of the windward surface 32 in the above content. The windward surface 32 is connected to the leading edge area 31b, and an exhaust passage B is formed between the windward surface 32 and the volute 2, and between the leading edge area 31b and the volute 2.

[0088] See also Figure 5 , the air inlet of the return channel 33 is located on the windward surface 32, the shortest distance H3 between the air inlet of the return channel 33 and the leading edge area 31b is e*D, and the shortest distance H4 between the air outlet of the return channel 33 and the trailing edge area 31a is f*D, where e and f are both positive numbers, and D is the outer diameter of the crossflow impeller 4.

[0089] In a possible implementation, the value range of e is [0.15, 0.3], the value range of f is [0.1, 0.15], and the units of e and f are millimeters.

[0090] In a possible implementation, the channel width of the reflux channel 33 may be in the range of [1,3], in millimeters.

[0091] In one possible implementation, see Figure 1 , the value range of the angle θ between the air intake direction of the return channel 33 and the portion of the windward surface 32 close to the leading edge area 31b is [45 degrees, 90 degrees].

[0092] Experiments have shown that the stable eccentric vortex generated by the recirculation channel 33 has a better effect when the value is within the above range.

[0093] The above-mentioned value ranges of e and f, the value range of the channel width, the value range of the angle θ, and the value ranges of a, b, and c can be used in combination. Experiments have shown that this can further improve the stability of gas flow.

[0094] In the embodiment of the present disclosure, the shape of the cross-section of the return channel 33 in the direction perpendicular to the axis of the cross-flow impeller 4 can be any reasonable shape, for example, Figure 1 The cross-sectional shape of the return channel 33 shown in is an arc shape. Of course, the return channel 33 can also be any other reasonable linear shape, which is not limited in the embodiment of the present disclosure.

[0095] In a possible manner, the volute tongue 3 may also have a plurality of support plates, which are located in the return channel 33 and are evenly arranged along the axis direction parallel to the throughflow impeller 4, so as to support the return channel 33 and improve the strength of the volute tongue 3.

[0096] In a possible implementation, the volute tongue 3 may be hollowed out to reduce the weight of the volute tongue 3 and improve installation convenience.

[0097] In one possible implementation, see Figure 1 , the cross-flow fan may also include a heat exchanger 5, which is located between the exhaust channel B and the outlet of the shell 1. The gas flowing out of the exhaust channel B enters the heat exchanger 5 for heat exchange, then flows out of the heat exchanger 5 to the outlet of the shell 1, and then flows out from the outlet of the shell 1, thereby realizing the heat exchange of the gas.

[0098] In a possible implementation, the crossflow fan may further include a water receiving pan, which is located below the heat exchanger 5 and is used to receive the liquid generated when the gas is exchanging heat in the heat exchanger 5.

[0099] In a possible implementation, the crossflow fan may further include a motor, the output shaft of the motor is connected to the crossflow impeller 4, and the motor can drive the crossflow impeller 4 to rotate, thereby achieving gas diversion.

[0100] The crossflow fan provided in the embodiment of the present disclosure may be a combination of any of the above structures, and the embodiment of the present disclosure is not limited to this.

[0101] The embodiment of the present disclosure also provides an air conditioner, which includes any one of the above-mentioned cross-flow fans.

[0102] Using the cross-flow fan provided by the embodiment of the present disclosure, the first middle portion 31b1 of the leading edge region 31b forms an inclined surface toward the first end portions 31b2 on both sides, thereby increasing the cross-sectional area of ​​the exhaust passage B at the first end portions 31b2, so that the high-speed gas at the first middle portion 31b1 can flow toward both ends through the inclined surface, thereby increasing the gas flow rate at the two first end portions 31b2, reducing the difference between the gas flow rate at the first end portion 31b2 and the gas flow rate at the first middle portion 31b1, improving the uniformity of the gas flow, and thereby improving the overall performance of the cross-flow fan.

[0103] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.​

Claims

1. A crossflow fan, characterized in that: The crossflow fan comprises a housing (1), a volute (2), a volute tongue (3) and a crossflow impeller (4); The volute (2) and the volute tongue (3) are both connected to the housing (1); the volute tongue (3) has a guide surface (31); an air inlet passage (A) is formed between a trailing edge region (31a) of the guide surface (31) and the volute (2); and an air outlet passage (B) is formed between a leading edge region (31b) of the guide surface (31) and the volute (2); The cross-flow impeller (4) is located in the volute (2) and is rotatably connected to the housing (1); The leading edge region (31b) of the guide surface (31) has a first middle portion (31b1) and two first end portions (31b2) in a direction parallel to the axis of the crossflow impeller (4), and a first distance (L1) between the first middle portion (31b1) and the volute (2) is smaller than a second distance (L2) between the first end portions (31b2) and the volute (2).

2. The crossflow fan according to claim 1, characterized in that: The shapes of the leading edge region (31b) on the first section (S1) and the second section (S2) are respectively a first arc line and a second arc line, the shapes of the first arc line and the second arc line are the same, a third distance (L3) between a first point on the first arc line and the axis of the crossflow impeller (4) is equal to a fourth distance (L4) between a second point on the second arc line and the axis of the crossflow impeller (4), wherein the first section (S1) and the second section (S2) are both perpendicular to the axis of the crossflow impeller (4), and the first section (S1) is located on the side of the second section (S2) close to the first middle portion (31b1), and the positions of the first point and the second point correspond.

3. The crossflow fan according to claim 2, characterized in that: The middle region (31c) of the guide surface (31) has a second middle portion and two second end portions in a direction parallel to the axis of the crossflow impeller (4), and a fifth distance between the second middle portion and the volute (2) is smaller than a sixth distance between the second end portions and the volute (2).

4. The crossflow fan according to claim 3, characterized in that: The shapes of the middle region (31c) on the first section (S1) and the second section (S2) are respectively a third arc and a fourth arc, the third arc has the same shape as the fourth arc, a seventh distance between a third point on the third arc and the axis of the crossflow impeller (4) is equal to an eighth distance between a fourth point on the fourth arc and the axis of the crossflow impeller (4), wherein the positions of the third point and the fourth point correspond.

5. The crossflow fan according to any one of claims 2 to 4, characterized in that: The volute tongue (3) further comprises a windward surface (32), the windward surface (32) being connected to the leading edge region (31b), and the windward surface (32) and the volute (2), and the leading edge region (31b) and the volute (2) jointly form the exhaust passage (B); The windward surface (32) has a third middle portion and two third end portions in a direction parallel to the axis of the crossflow impeller (4), and a ninth distance between the third middle portion and the volute (2) is smaller than a tenth distance between the third end portions and the volute (2).

6. The crossflow fan according to claim 1, characterized in that: The volute tongue (3) also has a return channel (33), the air inlet of the return channel (33) is connected to the exhaust channel (B), and the air outlet of the return channel (33) is connected to the air inlet channel (A).

7. The cross flow fan according to claim 6, characterized in that: The volute tongue (3) further comprises a leeward surface (34), the leeward surface (34) being connected to the trailing edge region (31a), and the air inlet passage (A) is formed between the leeward surface (34) and the housing (1), and between the trailing edge region (31a) and the volute (2); The air outlet of the return channel (33) is located on the leeward surface (34).

8. The crossflow fan according to any one of claims 6 to 7, characterized in that: The circumference of the outer diameter of the cross-flow impeller (4) is tangent to the gas outlet direction of the gas outlet of the return channel (33).

9. The crossflow fan according to claim 8, characterized in that: The volute tongue (3) further comprises a windward surface (32), the windward surface (32) being connected to the leading edge region (31b), and the windward surface (32) and the volute (2), and the leading edge region (31b) and the volute (2) jointly form the exhaust passage (B); The air inlet of the reflow channel (33) is located on the windward surface (32), and the angle between the air inlet direction of the reflow channel (33) and the portion of the windward surface (32) close to the leading edge region (31b) is in the range of [45 degrees, 90 degrees].

10. An air conditioner, characterized in that: The air conditioner comprises the cross-flow fan as described in any one of claims 1-9.

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