Cross-flow fan and air supply equipment

Abstract

The invention relates to a cross-flow fan and air supply equipment. The cross-flow fan comprises a shell, a cross-flow wind wheel, a volute and a volute tongue. The shell is provided with an air inlet and an air outlet; the cross-flow wind wheel is located in the shell, the two ends of the cross-flow wind wheel are rotationally connected with the first side wall and the second side wall of the shell correspondingly, and the first side wall and the second side wall are the two opposite side walls in the shell; the volute and the volute tongue are both located in the shell, and the volute tongue is located between the cross-flow wind wheel and the air outlet. Wherein the first side wall, the second side wall, the volute and the volute tongue define an air exhaust channel, and the air exhaust channel is gradually shrunk in the air flow direction. By adopting the cross-flow fan, the noise of the cross-flow fan can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of electrical appliance technologies, and particularly relates to a cross-flow fan and a air supply device. Background Art

[0002] The cross-flow fan includes a housing, a cross-flow impeller and a volute assembly. The housing has an air inlet and an air outlet. The cross-flow impeller is located in the housing and is rotationally connected to two opposite inner walls in the housing through a shaft body. Two ports of the volute assembly respectively correspond to the air inlet and the air outlet, and are used to form a one-way flow channel between the air inlet and the air outlet.

[0003] Affected by the end walls of the impeller, the gas flow velocity in the air outlet area is symmetrically distributed in the axial direction of the impeller. The gas flow velocity is low at the positions corresponding to the two end walls of the impeller, and the gas flow velocity is high at the position corresponding to the middle of the impeller.

[0004] However, in the above structure, the gas in the high-flow velocity area will flow to the low-flow velocity area, easily forming recirculating gas and resulting in relatively high noise. Summary of the Invention

[0005] Embodiments of the present disclosure provide a cross-flow fan and an air supply device, which can solve the technical problems existing in the related art. The technical solutions are as follows:

[0006] In a first aspect, embodiments of the present disclosure provide a cross-flow fan, which includes a housing, a cross-flow impeller, a volute and a volute tongue;

[0007] The housing has an air inlet and an air outlet;

[0008] The cross-flow impeller is located in the housing, and two ends of the cross-flow impeller are respectively rotationally connected to a first side wall and a second side wall of the housing. The first side wall and the second side wall are two opposite side walls in the housing;

[0009] Both the volute and the volute tongue are located in the housing, and the volute tongue is located between the cross-flow impeller and the air outlet;

[0010] Wherein, the first side wall, the second side wall, the volute and the volute tongue enclose to form an exhaust passage, and the exhaust passage gradually narrows along the air flow direction.

[0011] In a possible implementation manner, the exhaust passage gradually narrows along the air flow direction in a first direction and / or a second direction. The first direction is parallel to the axis of the cross-flow impeller, and the second direction is perpendicular to the air flow direction.

[0012] In a possible implementation manner, the first side wall and the second side wall respectively have a convex structure, and the convex structure is located in the exhaust passage.

[0013] In a possible implementation, the volute tongue has a first guiding surface, and the protruding structure is arranged on the first guiding surface, and the first guiding surface is the wall surface of the volute tongue close to the volute housing.

[0014] In a possible implementation, the volute housing has a second guiding surface, and the protruding structure is arranged on the second guiding surface, and the second guiding surface is the wall surface of the volute housing close to the volute tongue.

[0015] In a possible implementation, there are gaps between the protruding structure and both the volute housing and the volute tongue.

[0016] In a possible implementation, the protruding structure is provided with a third guiding surface, and the third guiding surface is the wall surface of the protruding structure located in the exhaust air passage, and the third guiding surface is an arc surface.

[0017] In a possible implementation, the length of the third guiding surface in the axial direction of the cross-flow impeller is less than or equal to the impeller diameter of the cross-flow impeller.

[0018] In a possible implementation, the arc surface is a concave surface.

[0019] In a possible implementation, the first side wall has a first protruding structure, the second side wall has a second protruding structure, both the first protruding structure and the second protruding structure are located in the exhaust air passage, and the first protruding structure and the second protruding structure are symmetrically distributed on both sides of the working surface of the cross-flow impeller, and the working surface is perpendicular to the axis of the cross-flow impeller and is a surface equidistant from both ends of the cross-flow impeller.

[0020] In a possible implementation, the cross-flow fan further includes a heat exchange component, and the heat exchange component is located in the housing and in the air outlet direction of the exhaust air passage, and is used for heat exchange with the gas flowing out of the exhaust air passage.

[0021] In a second aspect, an embodiment of the present disclosure provides an air supply device, and the air supply device includes the cross-flow fan in the first aspect and its possible implementations.

[0022] The technical solutions provided by the embodiments of the present disclosure at least include the following beneficial effects:

[0023] An embodiment of the present disclosure provides a cross-flow fan, which includes a housing, a cross-flow impeller, a volute and a volute tongue. The first side wall, the second side wall, the volute and the volute tongue of the housing enclose an exhaust passage, and the exhaust passage tapers along the air flow direction. In this way, since the exhaust passage tapers along the air flow direction, it is equivalent to gradually reducing the pipe diameter along the air flow direction. The pipe diameter in the low-speed area decreases. Without changing the gas flow rate, the gas flow velocity in the low-speed area can be increased. Thus, the gas flow rate from the high-speed area to the low-speed area can be reduced, and the recirculating gas can be reduced. Furthermore, the efficiency of the cross-flow fan can be improved and the noise can be reduced.

[0024] 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

[0025] 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.

[0026] Figure 1 is a schematic structural diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0027] Figure 2 is a schematic structural diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0028] Figure 3 is a schematic structural diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0029] Figure 4 is a schematic structural diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0030] Figure 5 is a schematic structural diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0031] Figure 6 is a schematic structural diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0032] Figure 7 is a schematic structural diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0033] Figure 8 is a schematic structural diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0034] Figure 9 is a schematic structural diagram of a cross-flow fan shown in an embodiment of the present disclosure;

[0035] Figure 10 It is a schematic diagram showing the variation relationship between noise and air volume in an exhaust passage shown in an embodiment of the present disclosure.

[0036] Legend Explanation

[0037] 1. Housing;

[0038] 11. Air inlet; 12. Air outlet; 13. First side wall; 14. Second side wall; 15. Exhaust passage; 16. Protrusion structure; 17. Motor mounting groove;

[0039] 161. First protrusion structure; 162. Second protrusion structure; 16a. Third flow guiding surface;

[0040] 2. Cross-flow impeller;

[0041] 21. Impeller unit; 211. Partition board; 212. Blade;

[0042] 3. Volute;

[0043] 31. Second flow guiding surface;

[0044] 4. Volute tongue;

[0045] 41. First flow guiding surface;

[0046] 5. Heat exchange component;

[0047] 51. Heat exchange tube; 52. Cladding; 53. Fixing piece;

[0048] 100. Working surface;

[0049] 200. Gas flow channel. Detailed Embodiment

[0050] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0051] Unless otherwise defined, technical terms or scientific terms used herein shall have the ordinary meanings as 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 patent specification and claims of this 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 rather indicate the presence of at least one. Terms 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. 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 indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0052] Nowadays, due to advantages such as a compact structure, cross-flow fans are often used in the indoor units of household air conditioners. In related technologies, as Figure 8 shown, a cross-flow fan includes a housing 1, a cross-flow impeller 2, a volute 3 and a scroll tongue 4. The housing 1 includes an air inlet 11 and an air outlet 12. The cross-flow impeller 2 is rotatably connected to the inner wall of the housing 1. The volute 3 and the scroll tongue 4 form a one-way air duct on the side of the cross-flow impeller 2 close to the air outlet 12 of the fan to promote the impeller to exhaust air. A gas flow path 200 is formed by enclosing the first side wall 13, the second side wall 14, the volute 3 and the scroll tongue 4 of the housing 1. In the above structure, since the cross-flow impeller 2 is rotatably connected to the inner wall of the housing 1, considering the assembly error, an installation gap is usually reserved between the cross-flow impeller 2 and the inner wall of the housing 1. When the impeller rotates, there is friction between the gas in the impeller and the end walls on both sides of the impeller. At the same time, part of the gas is diverted to the above installation gap, which makes the gas flow velocity low at the positions corresponding to the end walls on both sides in the cross-flow impeller 2 and high at the positions corresponding to the middle part. That is, there are high-speed regions and low-speed regions in the gas in the impeller. However, referring to Figure 8 , in the axial direction of the cross-flow impeller 2, the cross-sectional areas of the gas flow path 200 corresponding to the high-speed region and the low-speed region do not change, which results in the existence of high-speed regions and low-speed regions in the gas after flowing out of the impeller. The gas in the high-speed region will flow towards the low-speed region, easily forming recirculating gas, leading to a chaotic flow field in the fan, seriously affecting the fan efficiency and generating relatively large noise at the same time.

[0053] An embodiment of the present disclosure provides a cross-flow fan, as Figure 2 shown, the cross-flow fan includes a housing 1, a cross-flow impeller 2, a volute 3 and a scroll tongue 4.

[0054] Among them, the housing 1 has an air inlet 11 and an air outlet 12. The cross-flow impeller 2 is located in the housing 1. The two ends of the cross-flow impeller 2 are respectively rotatably connected to the first side wall 13 and the second side wall 14 of the housing 1. The first side wall 13 and the second side wall 14 are two opposite side walls in the housing 1. The volute 3 and the volute tongue 4 are both located in the housing 1. The volute tongue 4 is located between the cross-flow impeller 2 and the air outlet 12 and is connected to the housing 1. The first side wall 13, the second side wall 14, the volute 3 and the volute tongue 4 enclose to form an exhaust passage 15, and the exhaust passage 15 tapers along the air flow direction.

[0055] In this way, since the exhaust passage tapers along the air flow direction, it is equivalent to gradually reducing the pipe diameter along the air flow direction. The pipe diameter of the low-speed area decreases. Without changing the gas flow rate, the gas flow velocity in the low-speed area can be increased. Thus, the gas flow rate from the high-speed area to the low-speed area can be reduced, and the recirculating gas can be reduced. Furthermore, the efficiency of the cross-flow fan can be improved and the noise can be reduced.

[0056] The following is an introduction to each component in the cross-flow fan respectively:

[0057] I. Housing 1

[0058] The housing 1 is a component in the cross-flow fan for fixedly connecting other components.

[0059] In one example, as Figure 1 shown, the housing 1 has a cubic thin plate structure. The housing 1 has an accommodation space for accommodating the cross-flow impeller 2, the volute 3 and the volute tongue 4. The housing 1 is provided with an air inlet 11 and an air outlet 12. There is a gas flow path 200 between the air inlet 11 and the air outlet 12.

[0060] The shapes of the air inlet 11 and the air outlet 12 can be the same or different. For example, the shapes of both the air inlet 11 and the air outlet 12 are rectangular, or the shape of the air inlet 11 is rectangular and the shape of the air outlet 12 is circular. The embodiments of the present disclosure do not limit the shapes of the air inlet 11 and the air outlet 12.

[0061] In implementation, as Figure 2 shown, the air inlet 11 and the air outlet 12 form an air flow path, and this air flow path passes through the cross-flow impeller 2. The air flow path includes the exhaust passage 15, and the exhaust passage 15 is formed by enclosing the first side wall 13, the second side wall 14, the volute 3 and the volute tongue 4. Among them, the first side wall 13 and the second side wall 14 are two opposite side walls in the housing 1.

[0062] In one example, the above-mentioned first side wall 13 and second side wall 14 respectively have a convex structure 16, and the convex structure 16 is located in the exhaust passage.

[0063] In this way, the convex structure 16 on the first side wall 13 can reduce the cross-sectional area of the low-speed area corresponding to one side of the first side wall 13, which is equivalent to reducing the pipe diameter of this low-speed area. The convex structure 16 on the second side wall 14 can reduce the cross-sectional area of the low-speed area corresponding to one side of the second side wall 14, which is also equivalent to reducing the pipe diameter of this low-speed area. Without changing the gas flow rate, the gas flow velocity in the low-speed area can be increased. Thus, the gas flow rate from the high-speed area to the low-speed area can be reduced, and the recirculating gas can be reduced. Furthermore, the efficiency of the cross-flow fan can be improved, and the noise can be reduced.

[0064] Exemplarily, the convex structure 16 and the first side wall 13 and the second side wall 14 in the housing 1 can be integrally formed, that is, the convex structure 16 is processed synchronously when the first side wall 13 and the second side wall 14 are processed. For example, the housing 1 is processed by a casting process, and the convex structure 16 is respectively arranged on the first side wall 13 and the second side wall 14 in the housing 1.

[0065] Exemplarily, the convex structure 16 and the first side wall 13 and the second side wall 14 in the housing 1 can be formed by a step-by-step processing method, that is, after the first side wall 13 and the second side wall 14 are processed, the convex structure 16 is respectively arranged on the first side wall 13 and the second side wall 14. For example, the housing 1 is processed by a stamping process, and then the convex structure 16 is respectively welded and fixed on the first side wall 13 and the second side wall 14 of the housing 1 by a welding process. Of course, the above-mentioned casting process, stamping process and welding process are only examples, and the forming process of the housing 1 is not limited thereto. Any reasonable processing process can be applied to the processing of the housing 1 and the convex structure 16 in practice.

[0066] The specific structural characteristics of the above convex structure 16 will be introduced in detail below and will not be specifically described here.

[0067] In one example, as Figure 9 shown, a motor mounting groove 17 is provided on the wall plate of the housing 1 adjacent to the air outlet 12 and opposite to the air inlet 11. The motor mounting groove 17 is used to accommodate the motor. The motor mounting groove 17 is communicated with the above-mentioned accommodation space through a circular through hole. The circular through hole is used to place the output shaft of the motor to drive the cross-flow impeller 2 to rotate.

[0068] II. Cross-flow impeller 2

[0069] The cross-flow impeller 2 is a power component used to drive the gas flow in the cross-flow fan.

[0070] As Figure 1 shown, the cross-flow impeller 2 is located in the accommodation space of the housing 1, and both ends of the cross-flow impeller 2 are rotatably connected to the first side wall 13 and the second side wall 14 of the housing 1 respectively.

[0071] Reference Figure 1 and Figure 2 As shown, the cross-flow impeller 2 has a cylindrical structure, and both end walls of the cross-flow impeller 2 in the axial direction are rotatably connected to the first side wall 13 and the second side wall 14 respectively.

[0072] Optionally, the cross-flow impeller 2 can be composed of multiple impeller monomers 21.

[0073] As Figure 3 shown, each impeller monomer 21 includes a partition plate 211 and multiple blade plates 212. The cross-flow impeller 2 includes multiple partition plates 211, the shape of the partition plates 211 can be circular, the radii of the multiple partition plates 211 are equal and concentrically arranged. Multiple blade plates 212 are arranged between every two adjacent partition plates 211, the multiple blade plates 212 are circumferentially distributed, and each blade plate 212 is an arc-shaped plate structure.

[0074] In this way, the processing difficulty of the cross-flow impeller 2 can be reduced.

[0075] In implementation, reference Figure 3 For the impeller monomer 21 close to the first side wall 13 (hereinafter referred to as the first impeller monomer), since a reference spacing is preset between the cross-flow impeller 2 and the first side wall 13, part of the gas entering the first impeller monomer will be diverted into the reference spacing, resulting in a decrease in the gas flow velocity in the first impeller monomer.

[0076] Optionally, the number of blade plates 212 in each impeller monomer 21 can be equal, and there is a phase difference between the blade plates 212 in two adjacent impeller monomers 21.

[0077] In this way, the overall performance of the cross-flow impeller 2 can be improved.

[0078] III. Volute 3 and volute tongue 4

[0079] The volute 3 and the volute tongue 4 are components in the cross-flow fan for forming a one-way air duct.

[0080] As Figure 2 shown, both the volute 3 and the volute tongue 4 are located in the housing 1 and are connected to the housing 1. The volute 3, the volute tongue 4, the first side wall 13 of the housing 1 and the second side wall 14 of the housing 1 enclose an exhaust passage 15, the exhaust passage 15 is located between the cross-flow impeller 2 and the air outlet 12, and the exhaust passage 15 tapers along the air flow direction.

[0081] In one example, the exhaust passage 15 tapers along the air flow direction in the first direction and / or the second direction.

[0082] Among them, the first direction is parallel to the axis of the cross-flow impeller 2, and the second direction is perpendicular to the air flow direction.

[0083] The connection methods between the volute 3, the volute tongue 4 and the housing 1 can be the same or different. For example, both the volute 3 and the volute tongue 4 are connected to the housing 1 by welding, or both the volute 3 and the volute tongue 4 are detachably connected to the housing 1 by bolts.

[0084] In one example, as Figure 2 shown, the volute 3 has an arc-shaped plate structure, and both the volute 3 and the volute tongue 4 are perpendicular to the first side wall 13 of the housing 1.

[0085] Exemplarily, as Figure 2 shown, the line connecting the end of the volute 3 far from the air outlet 12 and the end of the volute tongue 4 far from the air outlet 12 can pass through the diameter of the cross-flow impeller 2.

[0086] In this way, while ensuring the air intake volume of the cross-flow fan, the circulating air volume can be reduced, thereby improving the efficiency of the cross-flow fan.

[0087] As Figure 2 shown, a preset distance is preset between the end of the volute 3 far from the air outlet 12, the end of the volute tongue 4 far from the air outlet 12 and the cross-flow impeller 2.

[0088] In this way, contact between the cross-flow impeller 2 and the volute 3 and the volute tongue 4 can be avoided, thereby extending the service life of the cross-flow fan.

[0089] In implementation, if the value of the preset distance is too small, the cross-flow impeller 2 is likely to come into contact with the volute 3 and the volute tongue 4. If the value of the preset distance is too large, a large amount of gas may return to the air inlet 11 from the reference distance during the rotation of the cross-flow impeller 2, resulting in low efficiency of the cross-flow fan.

[0090] Exemplarily, the value range of the above preset distance can be [2 mm, 5 mm].

[0091] In implementation, considering the coaxiality error between the cross-flow impeller 2 and the housing 1, when the preset distance is less than 2 mm, that is, the distances from the end of the volute 3 far from the air outlet 12 and the end of the volute tongue 4 far from the air outlet 12 to the cross-flow impeller 2 are less than 2 mm, the cross-flow impeller 2 is very likely to rub and collide with the volute 3 and / or the volute tongue 4 during operation, generating noise. And when the preset distance is greater than 5 mm, that is, the distances from the end of the volute 3 far from the air outlet 12 and the end of the volute tongue 4 far from the air outlet 12 to the cross-flow impeller 2 are greater than 5 mm, due to the large gap between the cross-flow impeller 2 and the surrounding components, the pressure difference formed during the rotation of the cross-flow impeller 2 decreases accordingly. This makes the air volume passing through the exhaust passage 15 decrease under the condition that the cross-flow impeller 2 is at the same rotational speed, resulting in low efficiency of the cross-flow fan.

[0092] In one example, the value of the above preset distance is 3.5 mm.

[0093] In this way, while ensuring that the cross-flow impeller 2 does not come into contact with the volute 3 and the volute tongue 4 to avoid generating noise, it is ensured that the cross-flow fan has high efficiency.

[0094] Optionally, both the volute 3 and the volute tongue 4 can be hollow structures.

[0095] In this way, the overall weight of the cross-flow fan can be reduced, and the assembly difficulty of the cross-flow fan can be reduced.

[0096] Optionally, the cross-flow fan may further include a heat exchange component 5.

[0097] The heat exchange component 5 is a component in the cross-flow fan used for heat exchange with the gas flowing out of the cross-flow impeller 2.

[0098] Reference Figure 7 , the heat exchange component 5 is located in the housing 1, and is located in the air outlet direction of the exhaust air passage 15 and is connected to the housing 1.

[0099] In one example, reference Figure 6 , the heat exchange component 5 includes a plurality of heat exchange tubes 51 and a covering member 52.

[0100] Among them, a refrigerant flows through the heat exchange tubes 51, the covering member 52 is made of a porous material, and gas can pass from one side of the covering member 52 to the other side.

[0101] Exemplarily, the material of the covering member 52 can be foam or the like, and the embodiments of the present disclosure do not limit this.

[0102] In implementation, air enters the cross-flow fan through the air inlet 11, and then, after passing through the heat exchange component 5, the air is discharged from the cross-flow fan through the air outlet 12. During the process of the air passing through the heat exchange component 5, heat exchange occurs between the air and the heat exchange component 5. When the temperature of the refrigerant in the heat exchanger is lower than the air temperature, the air is cooled, and when the temperature of the refrigerant in the heat exchanger is higher than the air temperature, the air is heated. Subsequently, the air that has completed heat exchange is discharged from the cross-flow fan through the air outlet 12 to adjust the room temperature.

[0103] Optionally, the heat exchange component 5 further includes a fixing member 53.

[0104] Reference Figure 6 , the heat exchange component 5 includes two fixing members 53, one of the fixing members 53 is connected to the first side wall 13, and the other fixing member 53 is connected to the second side wall 14. The fixing member 53 is used to fixedly connect the heat exchange tubes 51.

[0105] In this way, the connection stability between the heat exchange component 5 and the housing 1 can be improved.

[0106] In the embodiments of the present disclosure, there are various possibilities for the structure of the convex structure 16, which will be introduced one by one below:

[0107] In some possible embodiments, the convex structure 16 is connected to the volute tongue 4.

[0108] As Figure 3 shown, the volute tongue 4 has a first guiding surface 41, and the first guiding surface 41 is the wall surface of the volute tongue 4 close to the volute casing 3.

[0109] Optionally, the convex structure 16 can be conical.

[0110] In one example, the convex structure 16 can be triangular pyramid-shaped. Refer to Figure 3 , the vertex of the convex structure 16 is located on the intersection line of the first guiding surface 41 and the first side wall 13, and is located on the side of the first side wall 13 away from the air outlet 12, and the bottom surface of the convex structure 16 is flush with the wall surface of the volute tongue 4 close to the air outlet 12.

[0111] In this way, the convex structure 16 can reduce the cross-sectional area of the exhaust air passage 15 at the corresponding position of the low-speed area, thereby, the gas flow rate at the corresponding position of the low-speed area can be increased, and further, the noise can be reduced and the efficiency of the cross-flow fan can be improved. At the same time, since the convex structure 16 is conical, in the gas flow direction, the cross-sectional area of the exhaust air passage 15 is gradually reduced, and the flow field distribution in the cross-flow fan can be stabilized, further reducing the noise and improving the efficiency of the cross-flow fan.

[0112] Furthermore, the convex structure 16 has a first wall surface, a second wall surface and a third wall surface. The first wall surface is the wall surface of the convex structure 16 connected to the housing 1, the second wall surface is the wall surface of the convex structure 16 connected to the volute tongue, and the third wall surface is the wall surface of the convex structure 16 located in the exhaust air passage 15, that is, the third guiding surface 16a of the convex structure 16.

[0113] Exemplarily, the above-mentioned first wall surface and the second wall surface can be perpendicular to each other. That is, the adjacent wall surfaces between the volute tongue 4 and the housing 1 can be perpendicular to each other.

[0114] In this way, the assembly difficulty between the housing 1 and the volute tongue 4 can be reduced.

[0115] In this example, both the first wall surface and the second wall surface are flat surfaces, and the third wall surface can be a flat surface or an arc surface. For example, the third wall surface can be a concave arc surface, or the third wall surface can be a convex arc surface. The embodiments of the present disclosure do not limit this.

[0116] Refer to Figure 3, the first edge of the convex structure 16 in the shape of a triangular pyramid extends along the air flow direction in the height direction of the exhaust passage 15 (i.e., perpendicular to the axis direction of the cross-flow impeller 2) with respect to the first guiding surface 41, and the second edge of the convex structure 16 in the shape of a triangular pyramid extends along the air flow direction in the axial direction of the cross-flow impeller 2 with respect to the first guiding surface 41.

[0117] Among them, the first edge is the edge of the convex structure 16 that intersects with the first side wall 13, and the second edge is the edge of the convex structure 16 that intersects with the first guiding surface 41.

[0118] Exemplarily, the angle formed by the first edge and the second edge is within the range of 5° to 30°.

[0119] In this way, the first edge and the second edge of the convex structure 16 can expand a third guiding surface 16a that extends in three-dimensional directions.

[0120] In implementation, referring to Figure 8 , affected by the assembly gap between the cross-flow impeller 2 and the end wall of the housing 1, in the exhaust passage 15, a low-speed area will be formed in the area near the cross-flow impeller 2 at the transition position between the first guiding surface 41 of the volute tongue 4 and the first side wall 13 (similarly for the second side wall 14). The pressure in the low-speed area is relatively small compared to the high-speed area. Relative to the high-speed area, the pressure gradient from the low-speed area to the high-speed area is an adverse pressure gradient. This makes it easy for the fluid in the low-speed area to separate and flow back during the movement towards the air outlet 12, and the separation and flow-back phenomenon becomes more serious along the air flow direction towards the downstream, resulting in a chaotic flow field and relatively high noise in the exhaust passage 15. By providing the convex structure 16 on the first side wall 13 and the second side wall 14, as described above, this is equivalent to reducing the pipe diameter size in the low-speed area, and thus can effectively accelerate the fluid in the low-speed area and prevent the fluid from separating and flowing back. Moreover, since the vertex of the convex structure 16 is located on the intersection line of the first guiding surface 41 and the first side wall 13, the third guiding surface 16a of the convex structure 16 extends in three-dimensional directions, and the cross-sectional area of the convex structure 16 perpendicular to the gas flow direction gradually increases. This is equivalent to the pipe diameter being smaller closer to the downstream in the low-speed area, and the size of the pipe diameter is matched with the degree of the separation and flow-back phenomenon, so that the fluid in the low-speed area can be accelerated more accurately, making the flow field in the exhaust passage 15 stable and thus reducing the noise.

[0121] Referring to Figure 10 , through the simulation experiment test results, by adopting the above technical solution, the stability degree of the flow field in the exhaust passage 15 can be greatly improved. Under the condition of the same air volume, the noise at the corresponding positions of the same test points in the exhaust passage 15 can be reduced by at least 1 dB.

[0122] In one example, the third guiding surface 16a of the convex structure 16 can be an arc surface.

[0123] In this way, the connection position between the third flow guiding surface 16a of the convex structure 16 and the housing 1 and the volute tongue 4 can be smoothly transitioned, so that the roughness of the connection position between the convex structure 16 and the housing 1 and the volute tongue 4 can be reduced. Furthermore, the reduction of the gas flow velocity at the corresponding position by the convex structure 16 can be avoided.

[0124] The radian of the third flow guiding surface 16a can be set by those skilled in the art according to actual needs, and the present disclosure embodiment does not limit the radian of the third flow guiding surface 16a.

[0125] Optionally, the third flow guiding surface 16a is an arc surface and is a concave surface.

[0126] In this way, it is equivalent to reducing the roughness of the third flow guiding surface 16a, and further, the reduction of the gas flow velocity at the corresponding position by the convex structure 16 can be avoided.

[0127] Optionally, the convex structure 16 can be integrally formed with the volute tongue 4.

[0128] In implementation, the convex structure 16 and the volute tongue 4 can be an integrally formed component. Specifically, convex structures 16 can be respectively arranged at both ends of the volute tongue 4, and the convex structures 16 are clamped with the first side wall 13 and the second side wall 14.

[0129] In this way, the processing difficulty of the convex structure 16 can be reduced, and the assembly difficulty between the volute tongue 4 and the housing 1 can be reduced.

[0130] In some possible embodiments, the convex structure 16 is connected to the volute 3.

[0131] As Figure 4 shown, the volute 3 has a second flow guiding surface 31, and the second flow guiding surface 31 is the wall surface of the volute 3 close to the volute tongue 4.

[0132] Optionally, the convex structure 16 can be in a conical shape.

[0133] In one example, the convex structure 16 can be in a triangular pyramid shape. Referring to Figure 4 , the vertex of the convex structure 16 is located on the intersection line of the second flow guiding surface 31 and the first side wall 13, and is located on the side of the first side wall 13 away from the air outlet 12, and the bottom surface of the convex structure 16 is flush with the wall surface of the volute 3 close to the air outlet 12.

[0134] Thus, due to the presence of the convex structure 16, the cross-sectional area of the exhaust passage 15 at the corresponding position of the low-speed region (i.e., the corresponding position of the end wall of the cross-flow impeller 2) is reduced. It is easy to understand that the cross-sectional area can increase the gas flow velocity at the corresponding position. Furthermore, the gas flow rate from the high-speed region to the low-speed region can be reduced, achieving noise reduction and improving the efficiency of the cross-flow fan. At the same time, since the convex structure 16 is conical, in the gas flow direction, the cross-sectional area of the exhaust passage 15 gradually decreases, which can stabilize the flow field distribution in the cross-flow fan, further reducing noise and improving the efficiency of the cross-flow fan.

[0135] Furthermore, the convex structure 16 has a fourth wall surface, a fifth wall surface, and a sixth wall surface. The fourth wall surface is the wall surface of the convex structure 16 connected to the first side wall 13, the fifth wall surface is the wall surface of the convex structure 16 connected to the volute 3, and the sixth wall surface is the third guiding surface 16a of the convex structure 16.

[0136] Exemplarily, the above-mentioned fifth wall surface and sixth wall surface can be perpendicular to each other. That is, the adjacent wall surfaces between the volute 3 and the housing 1 can be perpendicular to each other.

[0137] In this way, the assembly difficulty between the housing 1 and the volute 3 can be reduced.

[0138] In this example, both the fourth wall surface and the fifth wall surface are flat surfaces. The sixth wall surface can be a flat surface or an arc surface. For example, the sixth wall surface can be a concave arc surface, or the sixth wall surface can be a convex arc surface. The embodiments of the present disclosure do not limit this.

[0139] In one example, the third guiding surface 16a of the convex structure 16 can be an arc surface.

[0140] In this way, the connection positions between the third guiding surface 16a of the convex structure 16 and the housing 1 and the volute 3 can be smoothly transitioned, thereby reducing the roughness of the connection positions between the convex structure 16 and the housing 1 and the volute 3. Furthermore, it can be avoided that the convex structure 16 reduces the gas flow velocity at the corresponding position.

[0141] The radian of the third guiding surface 16a can be set by those skilled in the art according to actual needs. The embodiments of the present disclosure do not limit the radian of the third guiding surface 16a.

[0142] Optionally, the third guiding surface 16a is an arc surface and is a concave surface.

[0143] In this way, it is equivalent to reducing the roughness of the third guiding surface 16a, and further, it can be avoided that the convex structure 16 reduces the gas flow velocity at the corresponding position.

[0144] Optionally, the convex structure 16 can be integrally formed with the volute 3.

[0145] In implementation, the convex structure 16 and the volute 3 can be an integrally formed component. Specifically, convex structures 16 can be respectively arranged at both ends of the volute 3, and the convex structure 16 is snap-connected to the first side wall 13 and the second side wall 14.

[0146] In this way, the processing difficulty of the convex structure 16 can be reduced, and the assembly difficulty between the volute 3 and the housing 1 can be reduced.

[0147] In some possible embodiments, the convex structure 16 is not connected to the volute 3 and the volute tongue 4.

[0148] As Figure 5 shown, the first side wall 13 has a convex structure 16 at the position of the exhaust passage 15. The convex structure 16 is located between the volute 3 and the volute tongue 4, and there are gaps between the convex structure 16 and the volute 3 and the volute tongue 4.

[0149] Optionally, the convex structure 16 can be conical.

[0150] In one example, the convex structure 16 can be triangular pyramidal. The vertex of the convex structure 16 is located on the first side wall 13, and the distance from this vertex to the first guiding surface 41 is equal to the distance to the second guiding surface 31. The bottom surface of the convex structure 16 is flush with the wall surface of the volute tongue 4 close to the air outlet 12.

[0151] Optionally, the convex structure 16 has a seventh wall surface, an eighth wall surface and a ninth wall surface. The seventh wall surface is the connection surface between the convex structure 16 and the first side wall 13. Both the eighth wall surface and the ninth wall surface are guiding surfaces of the convex structure 16. The eighth wall surface is the guiding surface of the convex structure 16 close to the volute 3, and the ninth wall surface is the guiding surface of the convex structure 16 close to the volute tongue 4.

[0152] Refer to Figure 5 , the included angle formed by the eighth wall surface and the first side wall 13 is an obtuse angle, and the included angle formed by the ninth wall surface and the first side wall 13 is also an obtuse angle.

[0153] In this way, the convex structure 16 can reduce the cross-sectional area of the exhaust passage 15 at the corresponding position of the low-speed area. Thus, the gas flow velocity at the corresponding position of the low-speed area can be increased. Furthermore, the noise can be reduced and the efficiency of the cross-flow fan can be improved. At the same time, since the convex structure 16 is conical, in the gas flow direction, the cross-sectional area of the exhaust passage 15 gradually decreases, and the flow field distribution in the cross-flow fan can be stabilized, further reducing the noise and improving the efficiency of the cross-flow fan.

[0154] Optionally, the included angle formed by the eighth wall surface and the first side wall 13 can be equal to the included angle formed by the ninth wall surface and the first side wall 13.

[0155] Exemplarily, the value range of the above included angle can be 120° - 150°.

[0156] In this way, the flow field distribution in the cross-flow fan can be stabilized, and the overall performance of the cross-flow fan can be improved.

[0157] In one example, the third guiding surface 16a of the convex structure may be an arc surface. That is, both the above-mentioned eighth wall surface and the ninth wall surface are arc surfaces.

[0158] The radian of the eighth wall surface and the ninth wall surface may be the same or different. Those skilled in the art can set the radian of the eighth wall surface and the ninth wall surface according to actual needs, and the embodiments of the present disclosure do not limit this.

[0159] Optionally, the projection length of the third guiding surface 16a in the axial direction of the cross-flow impeller 2 is less than or equal to the impeller diameter of the cross-flow impeller 2.

[0160] In implementation, in the axial direction of the cross-flow impeller 2, the width of the low-speed area corresponding to the end walls on both sides of the cross-flow impeller 2 is small. Setting the projection length of the third guiding surface 16a in the axial direction of the cross-flow impeller 2 to be less than or equal to the impeller diameter of the cross-flow impeller 2 can ensure that the convex structure 16 only affects the gas flow velocity in the low-speed area and does not affect the gas flow velocity in the high-speed area.

[0161] In one example, when the cross-flow impeller 2 is composed of multiple impeller monomers 21, the projection length of the third guiding surface 16a in the axial direction of the cross-flow impeller 2 may be less than or equal to the distance between two adjacent partition plates 211.

[0162] In this way, the convex structure 16 only affects the gas flow velocity of the gas flowing out of the first impeller monomer, and it can be ensured that the convex structure 16 does not affect the gas flow velocity in the high-speed area.

[0163] The above uses the convex structure 16 on the first side wall 13 as an example for introduction. For the structure of the convex structure 16 on the second side wall, reference can be made to the above description and will not be elaborated here.

[0164] In some possible embodiments, the convex structures 16 on the first side wall 13 and the second side wall 14 are mirror-symmetrical.

[0165] As Figure 6 shown, the cross-flow impeller 2 has a working surface 100.

[0166] Among them, the working surface 100 is a plane perpendicular to the axis of the cross-flow impeller 2, and the distances from this plane to the end walls on both sides of the cross-flow impeller 2 are equal.

[0167] In one example, the first side wall 13 has a first convex structure 161, and the second side wall 14 has a second convex structure 162. Both the first convex structure 161 and the second convex structure 162 are located in the exhaust air passage 15, and the first convex structure 161 and the second convex structure 162 are symmetrically distributed with respect to the working surface 100 in a mirror image manner.

[0168] In this way, the symmetry of the flow field distribution in the cross-flow fan can be improved, and the overall performance of the cross-flow fan can be enhanced.

[0169] The technical solutions provided by the embodiments of the present disclosure at least include the following beneficial effects:

[0170] The embodiments of the present disclosure provide a cross-flow fan, which includes a housing 1, a cross-flow impeller 2, a volute 3, and a volute tongue 4. The first side wall 13, the second side wall 14, the volute 3, and the volute tongue 4 of the housing enclose to form an exhaust air passage 15, and the exhaust air passage 15 tapers along the air flow direction. In this way, since the exhaust air passage 15 tapers along the air flow direction, it is equivalent to gradually reducing the pipe diameter along the air flow direction. The pipe diameter of the low-speed area is reduced. Without changing the gas flow rate, the gas flow velocity in the low-speed area can be increased. Thus, the gas flow rate from the high-speed area to the low-speed area can be reduced, and the recirculating gas can be reduced. Furthermore, the efficiency of the cross-flow fan can be improved, and the noise can be reduced.

[0171] The embodiments of the present disclosure provide an air supply device, which includes the above-mentioned cross-flow fan. The air supply device can be an air conditioner or a tower fan. The embodiments of the present disclosure do not limit the type of the air supply device.

[0172] The above are only optional embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A cross-flow fan, characterized in that, the cross-flow fan comprises a housing (1), a cross-flow impeller (2), a volute (3) and a volute tongue (4); the housing (1) has an air inlet (11) and an air outlet (12); the cross-flow impeller (2) is located in the housing (1), and both ends of the cross-flow impeller (2) are rotatably connected to a first side wall (13) and a second side wall (14) of the housing (1), and the first side wall (13) and the second side wall (14) are two opposite side walls in the housing (1); both the volute (3) and the volute tongue (4) are located in the housing (1), and the volute tongue (4) is located between the cross-flow impeller (2) and the air outlet (12); wherein, the first side wall (13), the second side wall (14), the volute (3) and the volute tongue (4) enclose to form an exhaust passage (15), and the exhaust passage (15) tapers along the air flow direction.

2. The cross-flow fan according to claim 1, characterized in that, the exhaust passage (15) tapers along the air flow direction in a first direction and / or a second direction, the first direction is parallel to the axis of the cross-flow impeller (2), and the second direction is perpendicular to the air flow direction.

3. The cross-flow fan according to claim 1, characterized in that, the first side wall (13) and the second side wall (14) respectively have a convex structure (16), and the convex structure (16) is located in the exhaust passage (15).

4. The cross-flow fan according to claim 3, characterized in that, the volute tongue (4) has a first guide surface (41), and the convex structure (16) is arranged on the first guide surface (41), and the first guide surface (41) is the wall surface of the volute tongue (4) close to the volute (3).

5. The cross-flow fan according to claim 3, characterized in that, the volute (3) has a second guide surface (31), and the convex structure (16) is arranged on the second guide surface (31), and the second guide surface (31) is the wall surface of the volute (3) close to the volute tongue (4).

6. The cross-flow fan according to claim 3, characterized in that, there are gaps between the convex structure (16) and the volute (3) and the volute tongue (4) respectively.

7. The cross-flow fan according to any one of claims 3 to 6, characterized in that, the convex structure (16) is provided with a third guide surface (16a), and the third guide surface (16a) is the wall surface of the convex structure (16) located in the exhaust passage (15), and the third guide surface (16a) is an arc surface.

8. The cross-flow fan according to claim 7, characterized in that, the projection length of the third guide surface (16a) in the axial direction of the cross-flow impeller (2) is less than or equal to the impeller diameter of the cross-flow impeller (2).

9. The cross-flow fan according to claim 7, characterized in that, the arc surface is a concave surface.

10. The cross-flow fan according to claim 3, characterized in that, The first side wall (13) has a first convex structure (161), the second side wall (14) has a second convex structure (162), both the first convex structure (161) and the second convex structure (162) are located in the air exhaust passage (15), the first convex structure (161) and the second convex structure (162) are symmetrically distributed on both sides of the working surface (100) of the cross-flow impeller (2), and the working surface (100) is a surface perpendicular to the axis of the cross-flow impeller (2) and equidistant from both ends of the cross-flow impeller (2).

11. The cross-flow fan according to claim 1, characterized in that the cross-flow fan further comprises a heat exchange component (5), the heat exchange component (5) is located in the housing (1) and in the air outlet direction of the air exhaust passage (15) for performing heat exchange with the gas flowing out of the air exhaust passage (15).

12. An air supply device, characterized in that the air supply device comprises the cross-flow fan according to any one of claims 1 to 11.

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