Cross-flow fan and air conditioner

Abstract

The present application relates to the technical field of air conditioners, and provides a cross-flow fan and an air conditioner. The cross-flow fan comprises a housing, a volute, a tongue, and a cross-flow impeller; the volute and the tongue are both connected to the housing, an air inlet channel and an air outlet channel are formed between the volute and the tongue, the tongue is provided with a return channel, an air inlet of the return channel is communicated with the air outlet channel, and an air outlet of the return 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 outlet channel, and is rotatably connected to the housing; in the direction parallel to the axis of the cross-flow impeller, the return channel is located in the middle of the tongue, and the length of the return channel is less than the total length of the tongue. By using the present application, the position of the eccentric vortex is more stable, so that the pressure resistance of the cross-flow fan is improved, the stall is reduced or even delayed, the generation of noise is avoided, and the machining difficulty and machining time are reduced, improving the machining efficiency of the cross-flow fan.

Description

Crossflow fans and air conditioners

[0001] This application claims priority to Chinese patent application No. 202311555005.6, filed on November 20, 2023, with invention name “Cross-flow fan and air conditioner”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of air conditioners, and in particular to a cross-flow fan and an air conditioner. Background Art

[0003] A cross-flow fan includes a casing, a volute, a volute tongue and a cross-flow impeller. Usually, an air inlet channel and an air exhaust channel are formed between the volute and the volute tongue. The gas enters the air inlet channel under the action of the cross-flow impeller, and after encountering the volute tongue, it is guided to the exhaust channel along the surface of the volute tongue for the next step of processing.

[0004] However, for the above structure, when the system resistance of the cross-flow fan increases (for example, the air inlet and exhaust channels are blocked, etc.), the gas flowing inside it is prone to stall, thereby reducing the stability of the gas flow, easily causing surge and leading to a sharp increase in noise. Summary of the Invention

[0005] The embodiments of the present application 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:

[0006] On the one hand, an embodiment of the present application provides a crossflow blower comprising a casing, a volute, a volute tongue and a crossflow impeller;

[0007] The volute and the volute tongue are both connected to the housing, an air inlet channel and an air exhaust channel are formed between the volute and the volute tongue, and the volute tongue has a return channel, an air inlet of the return channel is connected to the air exhaust channel, and an air outlet of the return channel is connected to the air inlet channel;

[0008] The cross-flow impeller is located in the volute and between the air inlet channel and the air outlet channel, and is rotatably connected to the housing;

[0009] In a direction parallel to the axis of the through-flow impeller, the return channel is located in the middle of the volute tongue, and the length of the return channel is less than the total length of the volute tongue.

[0010] In a possible implementation, the volute tongue further has a flow-guiding surface, a leeward surface, and a windward surface;

[0011] The cross-flow impeller is located between the guide surface and the volute;

[0012] The air inlet channel is formed between the leeward surface and the volute;

[0013] The exhaust passage is formed between the windward surface and the volute;

[0014] The air inlet is located on the windward side, and the air outlet is located on the leeward side.

[0015] In a possible implementation, a leading edge region of the guide surface is connected to the windward surface, and a trailing edge region of the guide surface is connected to the leeward surface, wherein the leading edge region and the trailing edge region are cambered surfaces.

[0016] In one possible implementation, the shortest distance between the leading edge area and the circumference of the outer diameter of the crossflow impeller is a*D, the shortest distance between the trailing edge area and the circumference of the outer diameter of the crossflow impeller is b*D, and the radius of the leading edge area 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.

[0017] In one possible implementation, the shortest distance between the air inlet and the leading edge area is e*D, and the shortest distance between the air outlet 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 cross-flow impeller.

[0018] In a possible implementation, the angle between the air intake direction of the air intake and the portion of the windward surface close to the leading edge area is in the range of [45 degrees, 90 degrees].

[0019] In a possible implementation, the circumference of the outer diameter of the cross-flow impeller is tangent to the gas outlet direction of the gas outlet.

[0020] In a possible implementation, in a direction parallel to the axis of the through-flow impeller, the length of the reflow channel is m times the total length of the volute tongue, wherein the value range of m is [0.5, 0.95].

[0021] In one possible implementation, the surface of the volute tongue has a plurality of guide teeth, and the plurality of guide teeth are arranged in a direction parallel to the axis of the through-flow impeller, and the extension direction of the guide teeth is the direction from the air inlet channel to the air exhaust channel.

[0022] In a possible implementation, the plurality of guide teeth are distributed at both ends of the volute tongue.

[0023] In a possible implementation, in a direction parallel to the axis of the through-flow impeller, the length of the plurality of guide teeth is n times the total length of the volute tongue, wherein the value range of n is [0.05, 1).

[0024] On the other hand, an embodiment of the present application provides an air conditioner, comprising a cross-flow fan as described in any one of the above items.

[0025] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0026] An embodiment of the present application provides a cross-flow fan, in which the volute has a recirculation channel, and the air outlet of the recirculation channel is connected to the air inlet channel. In this way, a portion of the gas in the exhaust channel can flow to the air outlet through the recirculation channel. The gas can play a certain control role on the gas around the cross-flow impeller at the air inlet channel, so that the position of the eccentric vortex generated when the cross-flow impeller is working is more stable, thereby improving the pressure resistance of the cross-flow fan, reducing or even delaying the stall, and avoiding the generation of noise.

[0027] Moreover, since in a cross-flow fan, the gas flow velocity in the middle of the volute tongue is relatively high, while the gas flow velocity at both ends of the volute tongue is relatively low, problems such as stall are more likely to occur at both ends of the volute tongue, and the partial reflow effect of the reflow channel at both ends of the volute tongue is not obvious. Therefore, in the direction parallel to the axis of the cross-flow impeller, the reflow channel is set to a length less than the total length of the volute tongue, and the reflow channel is set in the middle of the volute tongue. In this way, there is no need to set reflow channels at both ends of the volute tongue where the reflow effect is not obvious. Compared with the structure in which reflow channels are set in the middle and both ends of the volute tongue, its structure has little difference in effect on the performance improvement of the cross-flow fan, reduces the processing difficulty and time, and improves the processing efficiency of the cross-flow fan.

[0028] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] FIG1 is a schematic cross-sectional view of a cross-flow blower according to an embodiment of the present application;

[0031] FIG2 is a schematic structural diagram of a volute tongue shown in an embodiment of the present application;

[0032] FIG3 is a partial enlarged schematic diagram of portion E in FIG2 shown in an embodiment of the present application;

[0033] FIG4 is a cross-sectional schematic diagram of a volute, a volute tongue, and a cross-flow impeller shown in an embodiment of the present application;

[0034] FIG5 is a schematic structural diagram of a volute, a volute tongue, and a cross-flow impeller shown in an embodiment of the present application.

[0035] Legend: 1. Casing; 2. Volute; 3. Volute tongue; 4. Crossflow impeller; 5. Heat exchanger; 31. Return channel; 32. Guide surface; 33. Leeward side; 34. Windward side; 35. Guide tooth; 31a. Air inlet; 31b. Air outlet; 321. Leading edge area; 322. Trailing edge area; A. Air inlet channel; B. Air exhaust channel. DETAILED DESCRIPTION

[0036] The technical or scientific terms used herein should have the ordinary meaning understood by a person of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the patent application specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0038] An embodiment of the present application provides a cross-flow blower. Referring to FIG1 , the cross-flow blower includes a casing 1 , a volute 2 , a volute tongue 3 and a cross-flow impeller 4 .

[0039] The shell 1 can be of any reasonable shape, for example, it can have a rectangular parallelepiped shape or a cylindrical shape, etc., and this embodiment of the present application does not limit this.

[0040] The volute 2 is located in the housing 1 and is connected to the housing 1. In one 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, a snap connection can be performed by a snap connection structure, or a threaded connection can be performed by bolts, etc., which is not limited in the embodiments of the present application.

[0041] The volute tongue 3 is located in the housing 1 and is connected to the housing 1. In one possible implementation, the volute 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, a clamping connection can be performed by a clamping structure, or a threaded connection can be performed by a bolt, etc., which is not limited in the embodiments of the present application.

[0042] An air inlet channel A and an air outlet channel B are formed between the volute tongue 3 and the volute 2, and the air inlet channel A and the air outlet channel B are connected. In one possible implementation, the air inlet channel A and the air outlet channel B are formed between different surfaces of the volute tongue 3 and different parts of the volute 2 respectively.

[0043] The volute tongue 3 has a reflow channel 31, the air inlet 31a of the reflow channel 31 is connected to the exhaust channel B, and the air outlet 31b of the reflow channel 31 is connected to the air inlet channel A. In this way, after the gas enters the air inlet channel A and flows from the air inlet channel A to the exhaust channel B, part of the gas in the exhaust channel B can enter the air inlet 31a of the reflow channel 31 and flow out through the air outlet 31b of the reflow channel 31, that is, part of the gas in the exhaust channel B can flow back to the air inlet channel A through the reflow channel 21.

[0044] The cross-flow impeller 4 is located in the volute 2 and between the air inlet channel A and the air outlet channel B, and is rotatably connected to the housing 1 .

[0045] In this way, when the cross-flow impeller 4 rotates, it can drive the external air into the air inlet channel A, and guide the air in the air inlet channel A to the exhaust channel B.

[0046] 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 channel A to the air outlet channel B.

[0047] 1 , 2 and 5 , in a direction parallel to the axis of the throughflow impeller 4 , the return channel 31 is located in the middle of the volute tongue 3 , and a length L3 of the return channel 31 is less than the total length of the volute tongue 3 .

[0048] That is, in a direction parallel to the axis of the crossflow impeller 4 , the return channel 31 may include a middle portion and two end portions. The return channel 31 may be located in the middle portion of the volute tongue 3 , and no return channel 31 is provided at the two end portions of the volute tongue 3 .

[0049] In the embodiment of the present application, in the direction parallel to the axis of the cross-flow impeller 4, the length L3 of the return channel 31 can be any reasonable length and can be set according to actual needs, which is not limited in the embodiment of the present application.

[0050] The crossflow blower provided by the above-mentioned embodiment of the present application has at least the following beneficial effects:

[0051] The volute tongue 3 has a reflow channel 31, and the air outlet 31b of the reflow channel 31 is connected to 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 reflow channel 31. The gas can play a certain control role on the gas around the cross-flow impeller 4 at the air inlet channel A, so that the position of the eccentric vortex generated by the cross-flow impeller 4 when working is more stable, thereby improving the pressure resistance of the cross-flow fan, reducing or even delaying the stall, and avoiding the generation of noise.

[0052] Moreover, in the cross-flow fan, since the gap between the two ends of the volute tongue 3 and the shell 1 is small or even zero, the shell 1 causes a certain obstruction 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 the gas flow rate in 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 reflow effect of the reflow channel 31 at the two ends of the volute tongue 3 is also relatively less obvious. Therefore, in the embodiment of the present application, the reflow channel 31 is set in the middle of the volute tongue 3, and the reflow channel 31 is not set at the two ends of the volute tongue 3. Experiments have shown that compared with the structure in which the reflow channel 31 is set in the middle and both ends of the volute tongue 3, the reflow channel 31 is not set at the two ends of the volute tongue 3. It has no obvious effect or even no effect on the performance of the cross-flow fan. Therefore, this structure in which the reflow channel 31 is not set at the two ends of the volute tongue 3 can improve the pressure resistance of the cross-flow fan, delay stall, and reduce the processing difficulty and processing time, thereby improving the processing efficiency of the cross-flow fan.

[0053] In a possible implementation, referring to FIG. 1 and FIG. 2 , the volute tongue 3 may further include a flow-guiding surface 32 , a leeward surface 33 , and a windward surface 34 .

[0054] In a possible implementation, the guide surface 32 may be located between the leeward surface 33 and the windward surface 34 , and connected to the leeward surface 33 and the windward surface 34 .

[0055] The cross-flow impeller 4 is located between the guide 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 guide surface 32, so that the gas can flow smoothly from the air inlet channel A to the exhaust channel B.

[0056] An air inlet channel A is formed between the leeward surface 33 and the volute 2 , an air exhaust channel B is formed between the windward surface 34 and the volute 2 , the air inlet 31 b of the return channel 31 is located on the windward surface 34 , and the air outlet 31 b of the return channel 31 is located on the leeward surface 33 .

[0057] In this way, when the cross-flow impeller 4 rotates, the external 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 guide surface 32 through the air inlet channel A, and then flows through the channel to the exhaust channel B formed between the windward surface 34 and the volute 2. In the above process, the channels formed between the leeward surface 33, the guide surface 32, 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.

[0058] In the embodiment of the present application, the guide surface 32 can be a curved surface, a flat surface, or a joint surface of a curved surface and a flat surface, etc.

[0059] In one possible implementation, the guide surface 32 can be set as an arc surface. Furthermore, the guide surface 32 can be an arc surface that is raised in the direction away from the axis of the cross-flow impeller 4. In this way, while ensuring that the gap between the guide surface 32 and the circumference of the outer diameter of the cross-flow impeller 4 is within a smaller gap range, the guiding effect of the volute 3 on the gas is improved, thereby improving the overall performance of the cross-flow fan.

[0060] In the embodiment of the present application, the windward surface 34 can be a curved surface or a flat surface, etc.

[0061] In a possible implementation, the windward surface 34 may be set as a plane, thereby improving the stability of the gas flow in the exhaust channel B formed between the windward surface 34 and the volute 2.

[0062] Likewise, the leeward surface 33 may be a curved surface or a flat surface, etc.

[0063] In a possible implementation, the leeward surface 33 may be set as a plane, thereby improving the stability of the gas flow in the air inlet channel A formed between the leeward surface 33 and the volute 2.

[0064] In a possible implementation, an exhaust passage B may be formed between the windward surface 34 and the volute 2 , and between the windward surface 34 and the housing 1 .

[0065] In a possible implementation, an air inlet channel A may be formed between the leeward surface 33 and the volute 2 , and between the leeward surface 33 and the housing 1 .

[0066] In one possible implementation, referring to Figures 1, 2 and 3, the guide surface 32 has a leading edge area 321 and a trailing edge area 322, wherein the leading edge area 321 of the guide surface 32 is connected to the windward surface 34, and the trailing edge area 322 of the guide surface 32 is connected to the leeward surface 33.

[0067] In addition, the leading edge area 321 and the trailing edge area 322 can be set as arc surfaces, so that the leading edge area 321 can make the connection transition between the guide surface 32 and the windward surface 34 smoother, and the trailing edge area 322 can make the connection transition between the guide surface 32 and the leeward surface 33 smoother, thereby improving the stability of the gas flow.

[0068] In one possible implementation, the arc surface of the leading edge area 321 and the arc surface of the trailing edge area 322 can both be rounded arc surfaces, that is, the portion of the leading edge area 321 connected to the windward surface 34 is tangent to the windward surface 34, and the portion of the trailing edge area 322 connected to the leeward surface 33 is tangent to the leeward surface 22, thereby further improving the stability of the gas flow.

[0069] In one possible implementation, referring to FIG4 , the shortest distance H1 between the leading edge region 321 and the circumference of the outer diameter of the cross-flow impeller 4 is a*D, the shortest distance H2 between the trailing edge region 322 and the circumference of the outer diameter of the cross-flow impeller 4 is b*D, and the radius R1 of the leading edge region 321 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.

[0070] In one possible implementation, a may have a value range of [0.05, 0.07], b may have a value range of [0.03, 0.05], and c may have a value range of [0.05, 0.07]. The units of a, b, and c are all millimeters. For example, a may be 0.06 mm, b may be 0.04 mm, and c may be 0.06 mm.

[0071] Experiments have shown that the airflow 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 has a large system resistance (for example, when the air inlet channel A or the air exhaust channel B is blocked), the cross-flow fan has good pressure resistance, which reduces the possibility of airflow loss and avoids the generation of noise.

[0072] In one possible implementation, referring to FIG4 , the shortest distance H3 between the air inlet 31a of the return channel 31 and the leading edge region 321 is e*D, and the shortest distance H4 between the air outlet 31b of the return channel 31 and the trailing edge region 322 is f*D, where e and f are both positive numbers, and D is the outer diameter of the through-flow impeller 4.

[0073] 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.

[0074] In a possible implementation, referring to FIG. 4 , the channel width of the reflux channel 31 may be in the range of [1, 3], with the unit being millimeters.

[0075] In a possible implementation, referring to FIG. 1 , the angle θ between the air intake direction of the recirculation channel 31 and the portion of the windward surface 34 close to the leading edge region 321 is in the range of [45 degrees, 90 degrees].

[0076] Experiments have shown that the effect of generating a stable eccentric vortex in the return channel 31 is better when the value is within the above range.

[0077] Any at least two of 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.

[0078] In the embodiment of the present application, 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, as shown in Figure 1, the cross-sectional shape of the return channel 31 is a multi-fold arc shape. Of course, the return channel 31 can also be any other reasonable line shape, and the embodiment of the present application does not limit this.

[0079] In one possible embodiment, the volute tongue 3 may also have multiple support plates, which are located in the return channel 31 and evenly arranged along the axial direction parallel to the through-flow impeller 4, thereby supporting the return channel 31 and improving the strength of the volute tongue 3.

[0080] In a possible implementation, the volute tongue 3 may be hollowed out, thereby reducing the weight of the volute tongue 3 and improving installation convenience.

[0081] In the embodiment of the present application, the reflux channel 31 may also have the following structure:

[0082] The outer diameter of the crossflow impeller 4 is tangent to the direction of air discharge from the air outlet 31b of the return channel 31. For example, referring to the dashed line in FIG1 , which indicates the direction of air discharge from the air outlet 31b, it can be seen that the dashed line is tangent to the outer diameter of the crossflow impeller 4 in the air inlet channel A.

[0083] In this way, a portion of the gas in the exhaust channel B can flow to the air outlet 31b through the return channel 31. The gas can play a certain controlling role on the gas around the cross-flow impeller 4 at the air inlet channel A, so that the position of the eccentric vortex generated when the cross-flow impeller 4 is working (the position of the eccentric vortex is shown as an example in Figure 1) is more stable, thereby improving the pressure resistance of the cross-flow fan, reducing or even delaying the stall, and avoiding the generation of noise.

[0084] Moreover, the cross-flow fan proposed in the embodiment of the present application can be a combination of any structure described above and below. When the air outlet 31b of the return channel 31 is set on the leeward side 33, and the circumference of the outer diameter of the cross-flow impeller 4 is tangent to the air outlet direction of the air outlet 31b of the return channel 31, on the one hand, the gas flowing out of the air outlet 31b of the return channel 31 will not flow directly to the cross-flow impeller 4, and therefore will not cause a large airflow impact on the cross-flow impeller 4, thereby improving the stability of the gas flow.

[0085] On the other hand, the gas entering the crossflow impeller 4 can be controlled to further improve the stability of the position of the eccentric vortex, thereby enhancing the pressure resistance of the crossflow fan when the system resistance is large, delaying stall and avoiding noise.

[0086] Moreover, experiments have shown that when the above-mentioned a, b, c, e, f, the channel width of the return channel 31, and the angle θ are within their respective corresponding value ranges, and the air outlet 31b of the return channel 31 is located on the leeward side 33, and the circumference of the outer diameter of the cross-flow impeller 4 is tangent to the air outlet direction of the air outlet 31b of the return channel 31, the control of the overall gas flow in the cross-flow fan can be further enhanced, and the overall gas stability and uniformity of the cross-flow fan can be improved, thereby reducing noise and improving the overall performance of the cross-flow fan.

[0087] In one possible implementation, the length L3 of the return channel 31, in a direction parallel to the axis of the crossflow impeller 4, is m times the total length of the volute tongue 3, where m is in the range [0.5, 0.95]. Experiments have shown that when m is in the range [0.5, 0.95], the return channel 31 provides a better return flow effect, which is effective in improving the overall gas stability and uniformity of the crossflow blower, thereby enhancing the overall mechanical performance of the crossflow blower.

[0088] In the embodiment of the present application, the following settings can also be made for the snail tongue 3:

[0089] Referring to Figures 2, 3 and 5, on the basis of any of the above-mentioned cross-flow fans, the surface of the volute tongue 3 can also have a plurality of guide teeth 35, and these plurality of guide teeth 35 are arranged in a direction parallel to the axis of the cross-flow impeller 4, and the extension direction of the guide teeth 35 is the direction from the air inlet channel A to the exhaust channel B.

[0090] Among them, the structure of the guide tooth 35 can be any reasonable structure. In one possible implementation, the surface of the volute tongue 3 has a plurality of grooves, and these plurality of grooves are arranged along a direction parallel to the axis of the through-flow impeller 4, and the extension direction of each groove is the direction from the air inlet channel A to the exhaust channel B. The portion between each adjacent groove can be regarded as the guide tooth 35.

[0091] In this way, when the gas flows from the air inlet channel A to the exhaust channel B, the guide teeth 35 can further guide the gas, better control the flow direction of the gas, and make the gas flow more stable and concentrated, thereby reducing flow separation and reducing noise.

[0092] In one possible implementation, the shape of the guide tooth 35 can be any reasonable shape. For example, the cross-section of the guide tooth 35 can be rectangular (Figure 3 exemplarily shows a rectangular guide tooth 35), V-shaped, wavy, etc., which is not limited to the embodiment of the present application.

[0093] In one 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 are also possible and can be set as needed, and this embodiment of the application is not limited to this.

[0094] In one possible implementation, the plurality of guide teeth 35 may be distributed at both ends of the volute tongue 3. As required, the plurality of guide teeth 35 may be provided only at both ends of the volute tongue 3, where the two ends of the volute tongue 3 refer to the two ends of the volute tongue 3 in a direction parallel to the axis of the throughflow impeller 4.

[0095] 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, but at the two ends of the cross-flow fan, since the ends of the shell 1 and the volute 2 and the end of the volute tongue 3 are close to each other, the gas flow separation at the two ends of the cross-flow fan is more obvious, and gas stall is very likely to occur, thereby reducing the stability of the gas flow of the cross-flow fan.

[0096] In the embodiment of the present application, since multiple guide teeth 35 are provided at both ends of the volute tongue 3, the guide teeth 35 further guide the gas at both ends of the volute tongue 3 and control the flow of the gas to a certain extent, thereby reducing the flow separation of the gas at both ends of the volute tongue 3 and improving the gas flow control effect at both ends of the cross-flow blower. At the same time, it can also improve the gas flow control effect of the return channel 31 at both ends, improve the stability and uniformity of the overall gas flow, and thus reduce the noise generated by the cross-flow blower.

[0097] In this way, on the basis of the reflux channel 31 controlling the reflux of the gas in the middle of the volute tongue 3, the guide 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 guide teeth 35 set at both ends of the volute tongue 3 can also enhance the reflux effect of the part of the reflux channel 31 close to the guide teeth 35, further improving the flow control effect of the reflux channel 31, thereby improving the stability and uniformity of the gas flow.

[0098] Furthermore, multiple guide teeth 35 can be evenly distributed at both ends of the volute tongue 3, so that the gas flow at both ends of the volute tongue 3 can be more stable and regular, further reducing the flow separation of the gas at both ends of the volute tongue 3, thereby improving the stability and uniformity of the overall gas flow, thereby reducing noise.

[0099] Referring to FIG5 , in order to further improve the stability of the overall gas flow, the following setting can also be made: in the direction parallel to the axis of the through-flow impeller 4, the length (L1+L2) of the plurality of guide teeth 35 is n times the total length of the volute tongue 3, where the value range of n is [0.05,1).

[0100] Experiments have shown that when n is in the range of [0.05, 1), the guide teeth 35 are more effective in improving the stability and uniformity of the gas in the cross flow fan. Furthermore, when n is in the range of [0.05, 1) and m is in the range of [0.5, 0.95], the overall stability and uniformity of the gas in the cross flow fan can be effectively improved.

[0101] For example, the length L1 of the multiple guide teeth 35 set at one end of the volute tongue 3 can be 0.15 times the total length of the volute tongue 3, the length L2 of the multiple guide teeth 35 set at the other end of the volute tongue 3 is also 0.15 times the total length of the volute tongue 3, and the length L3 of the reflow channel 31 can be 0.7 times the total length of the volute tongue 3. In this way, by setting the position and length of the reflow channel 31 and the multiple guide teeth 35, the stability of the overall gas flow is further improved, thereby reducing noise.

[0102] 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 embodiment of the present application can be a setting without overlap as in the above example, or a setting with overlapping parts, which is not limited in the embodiment of the present application.

[0103] In one possible implementation, 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 set on the guide surface 32, the leeward surface 33 and the windward surface 34. In the extension direction of the guide teeth 35, its two ends can be located on the leeward surface 33 and the windward surface 34 respectively. This application is private and does not limit the extension length of the guide teeth 35 and the specific position in the extension direction.

[0104] It is understandable that when the return channel 31 and the guide teeth 35 overlap, there will be no structural interference between the two.

[0105] In one possible implementation, referring to FIG1 , the cross-flow fan may further 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 heat exchange of the gas.

[0106] In a possible implementation, the cross-flow fan may further include a water receiving pan, which is located below the heat exchanger 5 and is used to receive liquid generated when the gas is subjected to heat exchange in the heat exchanger 5 .

[0107] In a possible implementation, the crossflow blower may further include a motor, the output shaft of the motor being connected to the crossflow impeller 4 , and the motor can drive the crossflow impeller 4 to rotate, thereby guiding the gas.

[0108] The cross-flow blower provided in the embodiment of the present application can be a combination of any of the above structures, and the embodiment of the present application is not limited to this.

[0109] An embodiment of the present application also provides an air conditioner, which includes any one of the above-mentioned cross-flow fans.

[0110] Using the cross-flow fan provided in the embodiment of the present application, an air inlet channel A and an air exhaust channel B are formed between the volute 2 and the volute tongue 3. The volute tongue 3 has a return channel 31 and multiple guide teeth 35. The 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 exhaust channel B.

[0111] In this way, a portion of the gas in the exhaust channel B can flow to the air outlet 31b through the return channel 31. The gas can play a certain controlling role on the gas around the cross-flow impeller 4 at the air inlet channel A, so that the position of the eccentric vortex generated when the cross-flow impeller 4 is working is more stable, thereby improving the pressure resistance of the cross-flow fan, reducing or even delaying the stall, and avoiding the generation of noise.

[0112] Moreover, in the embodiment of the present application, the return channel 31 is arranged in the middle of the volute tongue 3, and the return channel 31 is not arranged at the two ends of the volute tongue 3. Experiments have shown that, compared with the structure in which the return channel 31 is arranged in the middle and at both ends of the volute tongue 3, not setting the return channel 31 at both ends of the volute tongue 3 has no obvious effect or even no effect on the performance of the cross-flow fan. Therefore, this structure in which the return channel 31 is not set at both ends of the volute tongue 3 can improve the pressure resistance of the cross-flow fan and delay stall, while also reducing the processing difficulty and processing time, thereby improving the processing efficiency of the cross-flow fan.

[0113] The above are merely optional embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection 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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