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, an air inlet channel and an air exhaust channel are formed between the volute and the volute tongue, the volute tongue is provided with a backflow channel, an air inlet of the backflow channel is communicated with the air exhaust channel, and an air outlet of the backflow channel is communicated with the air inlet channel; the cross-flow impeller is located in the volute and between the air inlet channel and the air exhaust channel, and is rotationally connected with the shell. In the direction parallel to the axis of the cross-flow impeller, the backflow channel is located in the middle of the volute tongue, and the length of the backflow channel is smaller than the total length of the volute tongue. By the adoption of the cross-flow fan, the position of the eccentric vortex is more stable, so that the pressure resistance of the cross-flow fan is improved, stall is weakened or even delayed, noise is avoided, the machining difficulty is reduced, the machining time is shortened, and the machining efficiency 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] The 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. The 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] However, for the above structure, when the system resistance of the cross-flow fan increases (for example, when the air inlet passage and the air outlet passage are blocked, etc.), the gas flowing inside it is prone to stall, thereby reducing the stability of the gas flow and extremely likely to generate surging, which in turn leads to a sharp increase in noise. 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, embodiments of the present disclosure provide a cross-flow fan, which 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. An air inlet passage and an air outlet passage are formed between the volute and the volute tongue. The volute tongue has a return passage. The air inlet of the return passage is communicated with the air outlet passage, and the air outlet of the return passage is communicated with the air inlet passage;

[0007] The cross-flow impeller is located inside the volute and between the air inlet passage and the air outlet passage, and is rotatably connected to the housing;

[0008] In the direction parallel to the axis of the cross-flow impeller, the return passage is located in the middle of the volute tongue, and the length of the return passage is less than the total length of the volute tongue.

[0009] In a possible implementation manner, the volute tongue further has a guiding surface, a leeward surface and a windward surface;

[0010] The cross-flow impeller is located between the guiding surface and the volute;

[0011] The leeward surface and the volute form the air inlet passage therebetween;

[0012] The windward surface and the volute form the air outlet passage therebetween;

[0013] The air inlet is located on the windward surface, and the air outlet is located on the leeward surface.

[0014] In a possible implementation, the leading edge region of the flow guiding surface is connected to the windward surface, and the trailing edge region of the flow guiding surface is connected to the leeward surface, wherein the leading edge region and the trailing edge region are arc surfaces.

[0015] In a possible implementation, the shortest distance between the leading edge region and the circumference where the outer diameter of the cross-flow impeller is located is a*D, the 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 the radius of the leading edge region is c*D, wherein 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 D is the outer diameter of the cross-flow impeller.

[0016] In a possible implementation, the shortest distance between the air inlet and the leading edge region is e*D, and the shortest distance between the air outlet and the trailing edge region 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 cross-flow impeller.

[0017] In a possible implementation, the value range of the angle between the air inlet direction of the air inlet and the part of the windward surface close to the leading edge region is [45 degrees, 90 degrees].

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

[0019] In a possible implementation, in the direction parallel to the axis of the cross-flow impeller, the length of the return channel is m times the total length of the volute tongue, wherein the value range of m is [0.5, 0.95].

[0020] In a possible implementation, the surface of the volute tongue has a plurality of flow guiding teeth, the plurality of flow guiding teeth are arranged in the direction parallel to the axis of the cross-flow impeller, and the extending direction of the flow guiding teeth is the direction from the air inlet channel to the air outlet channel.

[0021] In a possible implementation, the plurality of flow guiding teeth are distributed at both ends of the volute tongue.

[0022] In a possible implementation, in the direction parallel to the axis of the cross-flow impeller, the length of the plurality of flow guiding teeth is n times the total length of the volute tongue, wherein the value range of n is [0.05, 1).

[0023] On the other hand, an embodiment of the present disclosure provides an air conditioner, and the air conditioner includes a cross-flow fan as described in any one of the above.

[0024] The technical solutions provided by the embodiments of the present disclosure at least include the following beneficial effects:

[0025] An embodiment of the present disclosure provides a cross-flow fan, and the scroll tongue has a return channel. The air outlet of the return channel is communicated with the air inlet channel. In this way, a part of the gas in the exhaust channel can flow to the air outlet through the return channel. This gas can play a certain control role on the gas around the cross-flow impeller at the air inlet channel, making the position of the eccentric vortex generated when the cross-flow impeller works more stable, thereby improving the compressive resistance of the cross-flow fan, weakening or even delaying stall, and thus avoiding the generation of noise.

[0026] Moreover, in the cross-flow fan, the gas flow velocity in the middle of the scroll tongue is relatively high, while the gas flow velocity at both ends of the scroll tongue is relatively low. Stall and other problems are more likely to occur at both ends of the scroll tongue. And the return effect of the return channel at both ends of the scroll tongue is not obvious. Therefore, in the direction parallel to the axis of the cross-flow impeller, the length of the return channel is set to be less than the total length of the scroll tongue, and the return channel is set at the middle position of the scroll tongue. In this way, there is no need to set return channels at both ends of the scroll tongue where the return effect is not obvious. Compared with the structure with return channels provided at both the middle and both ends of the scroll tongue, its impact on improving the performance of the cross-flow fan is not much different, and it also reduces the processing difficulty and processing time, and improves the processing efficiency of the cross-flow fan.

[0027] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 is a cross-sectional schematic diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0030] Figure 2 is a structural schematic diagram of a scroll tongue shown in an embodiment of the present disclosure;

[0031] Figure 3 is shown in an embodiment of the present disclosure Figure 2 a partial enlarged schematic diagram of part E therein;

[0032] Figure 4It is a schematic cross-sectional view of a volute, a volute tongue and a cross-flow impeller shown in an embodiment of the present disclosure;

[0033] Figure 5 It is a schematic structural view of a volute, a volute tongue and a cross-flow impeller shown in an embodiment of the present disclosure.

[0034] Legend Explanation

[0035] 1. Housing; 2. Volute; 3. Volute tongue; 4. Cross-flow impeller; 5. Heat exchanger;

[0036] 31. Return channel; 32. Guide surface; 33. Leeward surface; 34. Windward surface; 35. Guide teeth;

[0037] 31a. Air inlet; 31b. Air outlet;

[0038] 321. Leading edge region; 322. Trailing edge region;

[0039] A. Air inlet channel; B. Air exhaust channel. 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 the present disclosure pertains. The words "first", "second", "third" and the like used in the specification and claims of the present patent application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one. Words such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0041] To make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

[0042] An embodiment of the present disclosure provides 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. The embodiments of the present 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 they can be two structures connected by a reasonable connection method. The connection method can be any reasonable method. For example, they can be connected by a snap structure, or connected by bolts through threaded connection, etc. The embodiments of the present disclosure do not limit this.

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

[0046] An air inlet passage A and an air exhaust passage B are formed between the scroll tongue 3 and the volute 2, and the air inlet passage A and the air exhaust passage B are connected. In a possible implementation, the air inlet passage A and the air exhaust passage B are formed between different surfaces of the scroll tongue 3 and different parts of the volute 2 respectively.

[0047] The scroll tongue 3 has a return passage 31. The air inlet 31a of the return passage 31 is connected to the air exhaust passage B, and the air outlet 31b of the return passage 31 is connected to the air inlet passage A. In this way, when the gas enters the air inlet passage A and flows from the air inlet passage A to the air exhaust passage B, part of the gas in the air exhaust passage B can enter the air inlet 31a of the return passage 31 and flow out through the air outlet 31b of the return passage 31, that is, part of the gas in the air exhaust passage B can be returned to the air inlet passage A through the return passage 21.

[0048] The cross-flow impeller 4 is located inside the volute 2 and between the air inlet passage A and the air exhaust passage B, and is rotatably connected to the housing 1.

[0049] In this way, when the cross-flow impeller 4 rotates, it can drive the outside gas into the air inlet passage A and guide the gas in the air inlet passage A to the air exhaust passage B.

[0050] It can be understood that the rotation direction of the cross-flow impeller 4 is the direction of guiding the gas from the air inlet passage A to the air exhaust passage B.

[0051] See Figure 1 、 Figure 2 and Figure 5, in the direction parallel to the axis of the cross-flow impeller 4, the return channel 31 is located in the middle of the volute tongue 3, and the length L3 of the return channel 31 is less than the total length of the volute tongue 3.

[0052] That is, in the direction parallel to the axis of the cross-flow impeller 4, the return channel 31 may include a middle part and two end parts. The return channel 31 may be located in the middle of the volute tongue 3, and no return channel 31 is provided at the positions of the two end parts of the volute tongue 3.

[0053] In the embodiment of the present disclosure, in the direction parallel to the axis of the cross-flow impeller 4, the length L3 of the return channel 31 may be any reasonable length, which can be set according to actual needs, and the embodiment of the present disclosure does not limit this.

[0054] The cross-flow fan provided by the embodiment of the present disclosure described above has at least the following beneficial effects:

[0055] The volute tongue 3 has a return channel 31, and the air outlet 31b of the return channel 31 is communicated with the air inlet channel A. In this way, a part of the gas in the exhaust channel B can flow to the air outlet 31b through the return channel 31. This gas can play a certain control role on the gas around the cross-flow impeller 4 at the air inlet channel A, making the position of the eccentric vortex generated when the cross-flow impeller 4 works more stable, thereby improving the pressure resistance of the cross-flow fan, weakening or even delaying stall, and thus avoiding the generation of noise.

[0056] Moreover, in the cross-flow fan, since the gaps between the two ends of the volute tongue 3 and the housing 1 are small or even zero, the housing 1 causes a certain blockage to the gas flowing through the two ends of the volute tongue 3, resulting in the gas flow rate at the two ends of the volute tongue 3 being lower than that at the middle of the volute tongue 3. The gas at the two ends of the volute tongue 3 is more likely to stall, and the return effect of the return channel 31 at the two ends of the volute tongue 3 is also less obvious. Therefore, in the embodiment of the present disclosure, the return channel 31 is arranged in the middle of the volute tongue 3, and no return channel 31 is arranged at the two ends of the volute tongue 3. Experiments prove that compared with the structure in which return channels 31 are arranged in the middle and at the two ends of the volute tongue 3, not arranging return channels 31 at the two ends of the volute tongue 3 has no obvious influence or even no influence on the performance of the cross-flow fan. Therefore, this structure without arranging return channels 31 at the two ends of the volute tongue 3 can improve the pressure resistance of the cross-flow fan, delay stall, and at the same time reduce the processing difficulty and processing time, and improve the processing efficiency of the cross-flow fan.

[0057] In a possible implementation manner, see Figure 1 and Figure 2 , the volute tongue 3 may further have a guide surface 32, a leeward surface 33 and a windward surface 34.

[0058] In a possible implementation, the flow guiding surface 32 can be located between the leeward surface 33 and the windward surface 34, and is connected to the leeward surface 33 and the windward surface 34.

[0059] The cross-flow impeller 4 is located between the flow guiding surface 32 and the volute 2. In this way, when the cross-flow impeller 4 rotates, it can drive the gas to flow along the channel formed between the volute 2 and the flow guiding surface 32, facilitating the smooth flow of the gas from the air inlet channel A to the air outlet channel B.

[0060] An air inlet channel A is formed between the leeward surface 33 and the volute 2, and an air outlet channel B is formed between the windward surface 34 and the volute 2. The air inlet 31b of the return channel 31 is located on the windward surface 34, and the air outlet 31b of the return channel 31 is located on the leeward surface 33.

[0061] In this way, when the cross-flow impeller 4 rotates, the outside air enters the air inlet channel A formed between the leeward surface 33 and the volute 2 under its action, then enters the channel formed between the volute 2 and the flow guiding surface 32 through the air inlet channel A, and then flows through this channel to the air outlet channel B formed between the windward surface 34 and the volute 2. In the above process, the channels formed between the three surfaces of the leeward surface 33, the flow guiding surface 32, and the windward surface 34 and the volute 2 are used to guide the gas, thereby improving the flow stability of the gas in the cross-flow fan.

[0062] In the embodiment of the present disclosure, the flow guiding surface 32 can be an arc surface, a plane, or, for example, a spliced surface of an arc surface and a plane, etc.

[0063] In a possible implementation, the flow guiding surface 32 can be set as an arc surface. Further, the flow guiding surface 32 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 32 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.

[0064] In the embodiment of the present disclosure, the windward surface 34 can be an arc surface, a plane, etc.

[0065] In a possible implementation, the windward surface 34 can be set as a plane. In this way, the flow stability of the gas in the air outlet channel B formed between the windward surface 34 and the volute 2 is improved.

[0066] Similarly, the leeward surface 33 can be an arc surface, a plane, etc.

[0067] In a possible implementation, the leeward surface 33 can be set as a plane. In this way, the flow stability of the gas in the air inlet channel A formed between the leeward surface 33 and the volute 2 is improved.

[0068] In a possible implementation, an exhaust air passage B can be jointly formed between the windward surface 34 and the volute 2 and between the windward surface 34 and the housing 1.

[0069] In a possible implementation, an air inlet passage A can be jointly formed between the leeward surface 33 and the volute 2 and between the leeward surface 33 and the housing 1.

[0070] In a possible implementation, referring to Figure 1 、 Figure 2 and Figure 3 , the guide surface 32 has a leading edge region 321 and a trailing edge region 322. Among them, the leading edge region 321 of the guide surface 32 is connected to the windward surface 34, and the trailing edge region 322 of the guide surface 32 is connected to the leeward surface 33.

[0071] And, the leading edge region 321 and the trailing edge region 322 can be set as arc surfaces. In this way, the leading edge region 321 can make the connection between the guide surface 32 and the windward surface 34 smoother, and the trailing edge region 322 can make the connection between the guide surface 32 and the leeward surface 33 smoother, thereby improving the stability of gas flow.

[0072] In a possible implementation, the arc surfaces of both the leading edge region 321 and the trailing edge region 322 can be fillet arc surfaces, that is: the part of the leading edge region 321 connected to the windward surface 34 is tangent to the windward surface 34, and the part of the trailing edge region 322 connected to the leeward surface 33 is tangent to the leeward surface 22. In this way, the stability of gas flow is further improved.

[0073] In a possible implementation, referring to Figure 4 , the shortest distance H1 between the leading edge region 321 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 322 and the circumference where the outer diameter of the cross-flow impeller 4 is located is b * D, and the radius R1 of the leading edge region 321 is equal to c * D. Among them, a, b, and c are all positive numbers, and D is the outer diameter of the cross-flow impeller 4.

[0074] In a possible implementation, the value range of a can be [0.05, 0.07], the value range of b can be [0.03, 0.05], the value range of c can be [0.05, 0.07], and the units of a, b, and c are all millimeters. For example, a can be 0.06 millimeters, b can be 0.04 millimeters, and c can be 0.06 millimeters.

[0075] Experiments have shown that the airflow of the crossflow fan within the above range is relatively stable, which is conducive to stabilizing the position of the eccentric vortex generated when the crossflow impeller 4 is working. Even when the system resistance of the crossflow fan is large (for example, when the air inlet channel A or the exhaust channel B is blocked), the crossflow fan has good pressure resistance, which reduces the possibility of air flow loss and avoids the generation of noise.

[0076] In one possible implementation, see Figure 4 , the shortest distance H3 between the air inlet 31a of the return channel 31 and the leading edge area 321 is e*D, and the shortest distance H4 between the air outlet 31b of the return channel 31 and the trailing edge area 322 is f*D, where e and f are both positive numbers, and D is the outer diameter of the crossflow impeller 4.

[0077] 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 both millimeters.

[0078] In one possible implementation, see Figure 4 , the channel width of the reflux channel 31 can be in the range of [1,3], in millimeters.

[0079] In one possible implementation, see Figure 1 , the value range of the angle θ between the air intake direction of the reflow channel 31 and the portion of the windward surface 34 close to the leading edge area 321 is [45 degrees, 90 degrees].

[0080] Experiments have shown that the stable eccentric vortex generated by the recirculation channel 31 has a better effect when the value is within the above range.

[0081] 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.

[0082] In the embodiment of the present disclosure, the shape of the cross-section of the return channel 31 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 reflux channel 31 shown in is a multi-fold arc shape. Of course, the reflux channel 31 can also be any other reasonable linear shape, which is not limited in the embodiment of the present disclosure.

[0083] In a possible manner, the volute tongue 3 may also have a plurality of support plates, which are located in the return channel 31 and are evenly arranged along the axis direction parallel to the crossflow impeller 4, so as to support the return channel 31 and improve the strength of the volute tongue 3.

[0084] In a possible implementation, the volute tongue 3 can also be hollowed out, thereby reducing the weight of the volute tongue 3 and improving the installation convenience.

[0085] In the embodiment of the present disclosure, for the return flow channel 31, it may also have the following structure:

[0086] The circumference where the outer diameter of the cross-flow impeller 4 is located is tangent to the outlet direction of the air outlet 31b of the return flow channel 31. Exemplarily, referring to Figure 1 the dotted line in, which represents the outlet direction of the air outlet 31b. It can be seen that the dotted line is tangent to the circumference where the outer diameter of the cross-flow impeller 4 in the air inlet channel A is located.

[0087] In this way, a part of the gas in the exhaust air channel B can flow through the return flow channel 31 to the air outlet 31b. This gas can play a certain control role on the gas around the cross-flow impeller 4 at the air inlet channel A, making the position of the eccentric vortex generated when the cross-flow impeller 4 works ( Figure 1 the position of the eccentric vortex is exemplarily shown in) more stable, thereby improving the pressure resistance of the cross-flow fan, weakening or even delaying stall, and thus avoiding the generation of noise.

[0088] Moreover, the cross-flow fan proposed in the embodiment of the present disclosure can be a combination of any structures described above and below. When the air outlet 31b of the return flow channel 31 is arranged on the leeward surface 33 and the circumference where the outer diameter of the cross-flow impeller 4 is located is tangent to the outlet direction of the air outlet 31b of the return flow channel 31, on the one hand, the gas flowing out from the air outlet 31b of the return flow channel 31 will not directly flow to the cross-flow impeller 4. Therefore, it will not cause a large air flow impact on the cross-flow impeller 4, improving the stability of gas flow.

[0089] On the other hand, it can control the gas entering the cross-flow impeller 4, thereby further improving the stability of the position of the eccentric vortex, and further enhancing the pressure resistance of the cross-flow fan when the system resistance is large, making it delay stall and avoid the appearance of noise.

[0090] Moreover, experiments have proved that when a, b, c, e, f, the channel width of the return flow channel 31, the included angle θ take values within their respective corresponding value ranges, and the air outlet 31b of the return flow channel 31 is located on the leeward surface 33 and the circumference where the outer diameter of the cross-flow impeller 4 is located is tangent to the outlet direction of the air outlet 31b of the return flow channel 31, the control of the overall gas flow in the cross-flow fan can be further enhanced, improving the overall gas stability and uniformity of the cross-flow fan, thereby reducing noise and improving the overall performance of the cross-flow fan.

[0091] In a possible implementation, in the direction parallel to the axis of the cross-flow impeller 4, the length L3 of the return channel 31 is m times the total length of the volute tongue 3, where the value range of m is [0.5, 0.95]. Experiments have shown that when m is taken from [0.5, 0.95], the return effect of the return channel 31 is better, and it has a better effect on improving the overall gas stability and uniformity of the cross-flow fan, thereby improving the overall performance of the cross-flow fan.

[0092] In the embodiments of the present disclosure, for the volute tongue 3, the following settings can also be made:

[0093] Referring to Figure 2 、 Figure 3 and Figure 5 , on the basis of any of the above cross-flow fans, the surface of the volute tongue 3 can also have a plurality of guide teeth 35, and these guide teeth 35 are arranged along the direction parallel to the axis of the cross-flow impeller 4, and the extending direction of the guide teeth 35 is the direction from the air inlet channel A to the air outlet channel B.

[0094] Among them, the structure of the guide teeth 35 can be any reasonable structure. In a possible implementation, the surface of the volute tongue 3 has a plurality of grooves, and these grooves are arranged along the direction parallel to the axis of the cross-flow impeller 4, and the extending direction of each groove is the direction from the air inlet channel A to the air outlet channel B, and the part between each adjacent groove can be regarded as the guide teeth 35.

[0095] In this way, when the gas flows from the air inlet channel A to the air outlet channel B, the guide teeth 35 can further guide the gas, better control the flow direction of the gas, so that the gas flows more stably and concentratedly, thereby reducing flow separation and reducing noise.

[0096] In a possible implementation, the shape of the guide teeth 35 can be any reasonable shape. For example, the cross-section of the guide teeth 35 can be rectangular ( Figure 3 exemplarily shows a rectangular guide tooth 35), V-shaped, wavy, etc., and the embodiments of the present disclosure do not limit this.

[0097] In a possible implementation, the size of the guide teeth 35 can be any reasonable size. For example, when the cross-section of the guide teeth 35 is rectangular, the tooth depth of the guide teeth 35 can be 1 mm to 3 mm, the tooth width of the guide teeth 35 can be 1 mm to 3 mm, and the tooth pitch of the guide teeth 35 can be 1 mm to 3 mm. Of course, other sizes can also be used, and they can be set according to requirements. The embodiments of the present disclosure do not limit this.

[0098] In a possible implementation, multiple flow guiding teeth 35 can be distributed at both ends of the volute tongue 3. According to requirements, multiple flow guiding teeth 35 can be provided only at both ends of the volute tongue 3, where both ends of the volute tongue 3 refer to: the two end portions of the volute tongue 3 in the direction parallel to the axis of the cross-flow impeller 4.

[0099] In the related art, in the direction parallel to the axis of the cross-flow impeller 4, the gas flow in the middle of the cross-flow fan is relatively stable. However, at both ends of the cross-flow fan, since the ends of the housing 1 and the volute 2 and the ends of the volute tongue 3 are relatively close, the gas flow separation at both ends of the cross-flow fan is relatively obvious, and gas stall is very likely to occur, thereby reducing the stability of the gas flow of the cross-flow fan.

[0100] In the embodiment of the present disclosure, since multiple flow guiding teeth 35 are provided at both ends of the volute tongue 3, the flow guiding teeth 35 further guide the gas at both ends of the volute tongue 3, and control the gas flow to a certain extent, thereby reducing the gas flow separation at both ends of the volute tongue 3, improving the gas flow control effect at both ends of the cross-flow fan, and at the same time, the gas flow control effect at both ends of the return channel 31 can also be improved, improving the stability and uniformity of the overall gas flow, and thereby reducing the noise generated by the cross-flow fan.

[0101] In this way, on the basis that the return channel 31 controls the return of the gas in the middle of the volute tongue 3, the flow guiding teeth 35 guide the gas at both ends of the volute tongue 3. The combined application of the two further improves the stability and uniformity of the gas flow. Moreover, the flow guiding teeth 35 provided at both ends of the volute tongue 3 can also improve the return effect of the part of the return channel 31 close to the flow guiding teeth 35, further improving the flow control effect of the return channel 31, thereby improving the stability and uniformity of the gas flow.

[0102] Furthermore, multiple flow guiding teeth 35 can be evenly distributed at both ends of the volute tongue 3. In this way, the gas flow at both ends of the volute tongue 3 can be made more stable and regular, further reducing the gas flow separation at both ends of the volute tongue 3, thereby improving the stability and uniformity of the overall gas flow and reducing the noise.

[0103] See Figure 5 , to further improve the stability of the overall gas flow, the following settings can also be made: in the direction parallel to the axis of the cross-flow impeller 4, the length (L1 + L2) of multiple flow guiding teeth 35 is n times the total length of the volute tongue 3, where the value range of n is [0.05, 1).

[0104] Experiments have shown that when n takes values from [0.05, 1), the guide teeth 35 have a better effect on improving the stability and uniformity of the gas in the cross-flow fan. Moreover, when n takes values from [0.05, 1) and m takes values from [0.5, 0.95], the overall stability and uniformity of the gas in the cross-flow fan can be effectively improved.

[0105] For example, the length L1 of the multiple guide teeth 35 provided at one end of the volute tongue 3 can be 0.15 times the total length of the volute tongue 3, and the length L2 of the multiple guide teeth 35 provided at the other end of the volute tongue 3 is also 0.15 times the total length of the volute tongue 3. The length L3 of the return channel 31 can be 0.7 times the total length of the volute tongue 3. In this way, by setting the positions and lengths of the return channel 31 and the multiple guide teeth 35, the stability of the overall gas flow is further improved, thereby reducing noise.

[0106] The length setting of the return channel 31 and the length setting of the guide teeth 35 at both ends of the volute tongue 3 in the embodiments of the present disclosure can be set without overlap as in the above example, or can be set to have an overlapping part. The embodiments of the present disclosure do not limit this.

[0107] In a possible implementation manner, when the volute tongue 3 has a guide surface 32, a leeward surface 33, and a windward surface 34, the guide teeth 35 can be provided on the guide surface 32, the leeward surface 33, and the windward surface 34. In the extending direction of the guide teeth 35, its two ends can be respectively located on the leeward surface 33 and the windward surface 34. The present disclosure does not limit the extending length of the guide teeth 35 and the specific position in the extending direction.

[0108] It can be understood that when the return channel 31 and the guide teeth 35 overlap, there will be no interference in their structures.

[0109] In a possible implementation manner, referring to Figure 1 , the cross-flow fan may further include a heat exchanger 5. The heat exchanger 5 is located between the exhaust air channel B and the outlet of the housing 1. The gas flowing out of the exhaust air channel B enters the heat exchanger 5 for heat exchange, then flows out of the heat exchanger 5 to the outlet of the housing 1, and then flows out of the outlet of the housing 1, thereby realizing the heat exchange of the gas.

[0110] In a possible implementation manner, the cross-flow fan may further include a water receiving tray. The water receiving tray is located below the heat exchanger 5 and is used to receive the liquid generated when the gas exchanges heat in the heat exchanger 5.

[0111] In a possible implementation manner, the cross-flow fan may further include a motor. The output shaft of the motor is connected to the cross-flow impeller 4. When the motor operates, it can drive the cross-flow impeller 4 to rotate, thereby realizing the diversion of the gas.

[0112] The cross-flow fan provided by the embodiments of the present disclosure can be a combination of any of the above structures, and the embodiments of the present disclosure do not limit this.

[0113] The embodiments of the present disclosure also provide an air conditioner, which includes any one of the above cross-flow fans.

[0114] By using the cross-flow fan provided by the embodiments of the present disclosure, an air inlet passage A and an air outlet passage B are formed between the volute 2 and the volute tongue 3. The volute tongue 3 has a return passage 31 and a plurality of guide teeth 35. The air outlet 31b of the return passage 31 is communicated with the air inlet passage A. The cross-flow impeller 4 is located inside the volute 2 and between the air inlet passage A and the air outlet passage B.

[0115] In this way, a part of the gas in the air outlet passage B can flow to the air outlet 31b through the return passage 31. 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 works more stable, thereby improving the compressive resistance of the cross-flow fan, weakening or even delaying stall, and thus avoiding the generation of noise.

[0116] Moreover, in the embodiments of the present disclosure, the return passage 31 is arranged in the middle of the volute tongue 3, and no return passage 31 is arranged at both ends of the volute tongue 3. Experiments prove that compared with the structure in which return passages 31 are arranged in the middle and at both ends of the volute tongue 3, not arranging return passages 31 at both ends of the volute tongue 3 has no obvious influence or even no influence on the performance of the cross-flow fan. Therefore, this structure without arranging return passages 31 at both ends of the volute tongue 3 can improve the compressive resistance of the cross-flow fan and delay stall, while reducing the processing difficulty and processing time, and improving the processing efficiency of the cross-flow fan.

[0117] The above are only optional embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

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); an air inlet channel (A) and an air outlet channel (B) are formed between the volute (2) and the volute tongue (3); the volute tongue (3) has a return channel (31); an air inlet (31a) of the return channel (31) is connected to the air outlet channel (B); and an air outlet (31b) of the return channel (31) is connected to the air inlet channel (A); The cross-flow impeller (4) is located inside the volute (2) and between the air inlet channel (A) and the air outlet channel (B), and is rotatably connected to the housing (1); In a direction parallel to the axis of the cross-flow impeller (4), the return channel (31) is located in the middle of the volute tongue (3), and the length of the return channel (31) is less than the total length of the volute tongue (3).

2. The crossflow fan according to claim 1, characterized in that: The volute tongue (3) also has a flow guide surface (32), a leeward surface (33) and a windward surface (34); The cross-flow impeller (4) is located between the flow guide surface (32) and the volute (2); The air inlet passage (A) is formed between the leeward surface (33) and the volute (2); The exhaust passage (B) is formed between the windward surface (34) and the volute (2); The air inlet (31a) is located on the windward surface (34), and the air outlet (31b) is located on the leeward surface (33).

3. The crossflow fan according to claim 2, characterized in that: The leading edge region (321) of the guide surface (32) is connected to the windward surface (34), and the trailing edge region (322) of the guide surface (32) is connected to the leeward surface (33), wherein the leading edge region (321) and the trailing edge region (322) are cambered surfaces.

4. The crossflow fan according to claim 3, characterized in that: The shortest distance between the leading edge region (321) and the circumference of the outer diameter of the crossflow impeller (4) is a*D, the shortest distance between the trailing edge region (322) and the circumference of the outer diameter of the crossflow impeller (4) is b*D, and the radius of the leading edge region (321) is c*D, wherein 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 D is the outer diameter of the crossflow impeller (4).

5. The crossflow fan according to claim 3, characterized in that: The shortest distance between the air inlet (31a) and the leading edge region (321) is e*D, and the shortest distance between the air outlet (31b) and the trailing edge region (322) 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 cross-flow impeller (4).

6. The cross flow fan according to claim 5, characterized in that: The value range of the angle between the air intake direction of the air intake port (31a) and the portion of the windward surface (34) close to the leading edge region (321) is [45 degrees, 90 degrees].

7. The crossflow fan according to any one of claims 1 to 6, 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 (31b).

8. The crossflow fan according to claim 7, characterized in that: In a direction parallel to the axis of the cross-flow impeller (4), the length of the return channel (31) is m times the total length of the volute tongue (3), wherein the value range of m is [0.5, 0.95].

9. The crossflow fan according to claim 1, characterized in that: The surface of the volute tongue (3) has a plurality of guide teeth (35), and the plurality of guide teeth (35) are arranged in a direction parallel to the axis of the crossflow impeller (4), and the extension direction of the guide teeth (35) is the direction from the air inlet channel (A) to the air outlet channel (B).

10. The cross flow fan according to claim 9, characterized in that: The plurality of guide teeth (35) are distributed at both ends of the volute tongue (3).

11. The cross flow fan according to claim 10, characterized in that: In a direction parallel to the axis of the crossflow impeller (4), the length of the plurality of guide teeth (35) is n times the total length of the volute tongue (3), wherein the value range of n is [0.05, 1).

12. An air conditioner, characterized in that: The air conditioner comprises the cross-flow fan as described in any one of claims 1-11.

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