Cross-flow fan and air supply apparatus

Abstract

A cross-flow fan and an air supply apparatus. The cross-flow fan comprises a housing, a cross-flow impeller, a volute and a volute tongue. The housing is provided with an air inlet and an air outlet; the cross-flow impeller is located in the housing, two ends of the cross-flow impeller being rotationally connected to a first side wall and a second side wall of the housing respectively, and the first side wall and the second side wall being two opposite side walls in the housing; the volute and the volute tongue are both located in the housing, and the volute tongue is located between the cross-flow impeller and the air outlet. 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 airflow direction.

Description

Crossflow fans and air supply equipment

[0001] This application claims priority to the Chinese patent application with application number 202311678380.X filed on December 7, 2023, and invention name “Cross-flow blower and air supply equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of electrical technology, and in particular to a cross-flow fan and air supply equipment. Background Art

[0003] A crossflow fan consists of a housing, a crossflow impeller, and a volute assembly. The housing has an air inlet and an air outlet. The crossflow impeller is located within the housing and is rotatably connected to two opposing inner walls of the housing via a shaft. The two ports of the volute assembly correspond to the air inlet and outlet, respectively, forming a one-way flow path between the inlet and outlet.

[0004] Affected by the end wall of the wind wheel, the gas flow velocity in the air outlet area is symmetrically distributed in the axial direction of the wind wheel. The gas flow velocity is low at the positions corresponding to the end walls on both sides of the wind wheel, and high at the position corresponding to the middle of the wind wheel.

[0005] However, in the above structure, the gas in the high flow rate area will flow to the low flow rate area, which is likely to form backflow gas and cause greater noise. Summary of the Invention

[0006] The embodiments of the present application provide a cross-flow blower and air supply equipment, which can solve the technical problems existing in the related art. The technical solutions are as follows:

[0007] In a first aspect, an embodiment of the present application provides a crossflow blower, comprising a housing, a crossflow impeller, a volute, and a volute tongue;

[0008] The housing has an air inlet and an air outlet;

[0009] The crossflow impeller is located in the housing, and two ends of the crossflow impeller are rotatably connected to a first side wall and a second side wall of the housing respectively, and the first side wall and the second side wall are two opposite side walls of the housing;

[0010] The volute and the volute tongue are both located in the housing, and the volute tongue is located between the crossflow impeller and the air outlet;

[0011] The first side wall, the second side wall, the volute and the volute tongue are arranged to form an exhaust passage, and the exhaust passage gradually contracts along the airflow direction.

[0012] In a possible implementation, the exhaust channel tapers along the airflow direction in a first direction and / or a second direction, the first direction is parallel to the axis of the crossflow impeller, and the second direction is perpendicular to the airflow direction.

[0013] In a possible implementation, the first side wall and the second side wall each have a protruding structure, and the protruding structure is located in the exhaust channel.

[0014] In a possible implementation, the volute tongue has a first guide surface, the protruding structure is provided on the first guide surface, and the first guide surface is a wall surface of the volute tongue close to the volute casing.

[0015] In a possible implementation, the volute has a second flow-guiding surface, the protruding structure is provided on the second flow-guiding surface, and the second flow-guiding surface is a wall surface of the volute close to the volute tongue.

[0016] In a possible implementation, there is a gap between the protruding structure and the volute and the volute tongue.

[0017] In a possible implementation, the protruding structure is provided with a third guide surface, the third guide surface is a wall surface of the protruding structure located in the exhaust channel, and the third guide surface is an arc-shaped surface.

[0018] In a possible implementation, a length of the third guide surface in the axial direction of the crossflow rotor is less than or equal to a rotor diameter of the crossflow rotor.

[0019] In a possible implementation, the arc-shaped surface is a concave surface.

[0020] In one possible implementation, the first side wall has a first protruding structure, and the second side wall has a second protruding structure. The first protruding structure and the second protruding structure are both located in the exhaust channel. The first protruding structure and the second protruding structure are symmetrically distributed on both sides of the working surface of the cross-flow wind wheel. The working surface is perpendicular to the axis of the cross-flow wind wheel and is equidistant from both ends of the cross-flow wind wheel.

[0021] In a possible implementation, the cross-flow blower further includes a heat exchange component, which is located in the housing and in the air outlet direction of the exhaust channel, and is used for performing heat exchange with the gas flowing out of the exhaust channel.

[0022] In a second aspect, an embodiment of the present application provides an air supply device, which includes the cross-flow blower in the first aspect and possible implementation methods thereof.

[0023] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0024] An embodiment of the present application provides a cross-flow blower, 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 are arranged to form an exhaust duct, and the exhaust duct gradually shrinks along the direction of the airflow. In this way, since the exhaust duct gradually shrinks along the direction of the airflow, it is equivalent to gradually reducing the pipe diameter along the direction of the airflow. The pipe diameter in the low-speed zone decreases, and the gas flow rate in the low-speed zone can be increased without changing the gas flow rate, thereby reducing the gas flow from the high-speed zone to the low-speed zone and reducing the backflow gas. In addition, the efficiency of the cross-flow blower can be improved and the noise can be reduced.

[0025] 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

[0026] 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.

[0027] FIG1 is a schematic structural diagram of a cross-flow blower shown in an embodiment of the present application;

[0028] FIG2 is a schematic structural diagram of a cross-flow blower shown in an embodiment of the present application;

[0029] FIG3 is a schematic structural diagram of a cross-flow blower shown in an embodiment of the present application;

[0030] FIG4 is a schematic structural diagram of a cross-flow blower shown in an embodiment of the present application;

[0031] FIG5 is a schematic structural diagram of a cross-flow blower shown in an embodiment of the present application;

[0032] FIG6 is a schematic structural diagram of a cross-flow blower shown in an embodiment of the present application;

[0033] FIG7 is a schematic structural diagram of a cross-flow blower shown in an embodiment of the present application;

[0034] FIG8 is a schematic structural diagram of a cross-flow blower shown in an embodiment of the present application;

[0035] FIG9 is a schematic structural diagram of a cross-flow blower shown in an embodiment of the present application;

[0036] FIG10 is a schematic diagram showing the relationship between noise and air volume in an exhaust passage according to an embodiment of the present application.

[0037] Legend

[0038] 1. Shell;

[0039] 11. Air inlet; 12. Air outlet; 13. First side wall; 14. Second side wall; 15. Exhaust duct; 16. Raised structure; 17. Motor mounting slot;

[0040] 161, first protruding structure; 162, second protruding structure; 16a, third guide surface;

[0041] 2. Crossflow impeller;

[0042] 21. Wind wheel unit; 211. Partition wall plate; 212. Leaf plate;

[0043] 3. Snail case;

[0044] 31. Second guide surface;

[0045] 4. Cochlear tongue;

[0046] 41. First guide surface;

[0047] 5. Heat exchange components;

[0048] 51. Heat exchange tube; 52. Covering part; 53. Fixing part;

[0049] 100. Working surface;

[0050] 200. Gas flow channel. DETAILED DESCRIPTION

[0051] 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.

[0052] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which this application belongs. The terms "first", "second", "third" and similar words 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, terms such as "a" or "an" do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms 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. Terms such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", "right", etc. 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.

[0053] Nowadays, cross-flow fans are often used in indoor units of household air conditioners due to their compact structure and other advantages. In the related art, as shown in Figure 8, the cross-flow fan includes a housing 1, a cross-flow impeller 2, a volute 3 and a volute tongue 4, wherein 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, and the volute 3 and the volute tongue 4 form a one-way air duct on the side of the cross-flow impeller 2 close to the fan outlet 12, so as to facilitate the exhaust of the impeller. The gas flow channel 200 is formed by the first side wall 13, the second side wall 14, the volute 3 and the volute tongue 4 of the housing 1. In the above structure, the cross-flow impeller 2 is rotatably connected to the inner wall of the housing 1. Taking into account 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 rotor rotates, friction occurs between the gas in the rotor and the end walls on both sides of the rotor. At the same time, some of the gas is diverted to the aforementioned installation gap. This results in low gas velocity near the end walls of the crossflow rotor 2, and high gas velocity in the middle. In other words, the gas in the rotor has high-speed and low-speed zones. However, referring to FIG8 , the cross-sectional areas of the gas flow channel 200 corresponding to the high-speed and low-speed zones in the axial direction of the crossflow rotor 2 do not change. This results in the gas still having high-speed and low-speed zones after it flows out of the rotor. Gas in the high-speed zone will flow toward the low-speed zone, easily forming backflow gas, causing a chaotic flow field within the fan, seriously affecting fan efficiency and generating considerable noise.

[0054] An embodiment of the present application provides a crossflow blower, as shown in FIG2 , which includes a housing 1 , a crossflow impeller 2 , a volute 3 and a volute tongue 4 .

[0055] The housing 1 has an air inlet 11 and an air outlet 12. A crossflow impeller 2 is located within the housing 1, with its ends rotatably connected to a first sidewall 13 and a second sidewall 14 of the housing 1, respectively. The first and second sidewalls 13, 14 are opposite sidewalls of the housing 1. A volute 3 and a volute tongue 4 are both located within the housing 1. The volute tongue 4 is located between the crossflow impeller 2 and the air outlet 12 and is connected to the housing 1. The first and second sidewalls 13, 14, volute 3, and volute tongue 4 enclose an exhaust duct 15, which gradually converges along the direction of airflow.

[0056] In this way, since the exhaust channel gradually shrinks along the direction of airflow, it is equivalent to gradually reducing the pipe diameter along the direction of airflow. The pipe diameter in the low-speed zone is reduced. Without changing the gas flow rate, the gas flow rate in the low-speed zone can be increased, thereby reducing the gas flow from the high-speed zone to the low-speed zone and reducing the backflow gas. In turn, the efficiency of the cross-flow fan can be improved and the noise can be reduced.

[0057] The following is an introduction to each component of the cross flow fan:

[0058] 1. Shell 1

[0059] The casing 1 is a component of the cross-flow fan used to fix and connect other components.

[0060] In one example, as shown in Figure 1, the housing 1 has a cubic thin plate structure. The housing 1 has a storage space for accommodating the crossflow impeller 2, volute 3, and volute tongue 4. The housing 1 is provided with an air inlet 11 and an air outlet 12. A gas flow channel 200 is defined between the air inlet 11 and the air outlet 12.

[0061] The shapes of the air inlet 11 and the air outlet 12 can be the same or different. For example, the shapes of the air inlet 11 and the air outlet 12 are both rectangular, or the shape of the air inlet 11 is rectangular and the shape of the air outlet 12 is circular. The embodiment of the present application does not limit the shapes of the air inlet 11 and the air outlet 12.

[0062] In practice, as shown in FIG2 , the air inlet 11 and the air outlet 12 form an airflow path that passes through the crossflow impeller 2. The airflow path includes an exhaust passage 15, which is formed by the first sidewall 13, the second sidewall 14, the volute 3, and the volute tongue 4. The first sidewall 13 and the second sidewall 14 are opposite sidewalls of the housing 1.

[0063] In one example, the first side wall 13 and the second side wall 14 respectively have a protruding structure 16 , and the protruding structure 16 is located in the exhaust channel.

[0064] In this way, the raised structure 16 on the first sidewall 13 can reduce the cross-sectional area of ​​the low-speed zone corresponding to the first sidewall 13, which is equivalent to reducing the pipe diameter in this low-speed zone. The raised structure 16 on the second sidewall 14 can also reduce the cross-sectional area of ​​the low-speed zone corresponding to the second sidewall 14, which is also equivalent to reducing the pipe diameter in this low-speed zone. Without changing the gas flow rate, the gas flow rate in the low-speed zone can be increased, thereby reducing the gas flow from the high-speed zone to the low-speed zone, reducing backflow gas, and thus improving the efficiency of the crossflow blower and reducing noise.

[0065] Exemplarily, the raised structure 16 and the first side wall 13 and the second side wall 14 in the shell 1 can be integrally formed, that is, the raised structure 16 is processed simultaneously when the first side wall 13 and the second side wall 14 are processed. For example, the shell 1 is processed and formed by a casting process, and the raised structure 16 is respectively provided on the first side wall 13 and the second side wall 14 in the shell 1.

[0066] For example, the protruding structure 16 and the first side wall 13 and the second side wall 14 of the housing 1 can be formed in a step-by-step process. That is, after the first side wall 13 and the second side wall 14 are formed, the protruding structure 16 is respectively provided on the first side wall 13 and the second side wall 14. For example, the housing 1 is formed by a stamping process, and then the protruding structure 16 is respectively welded and fixed to the first side wall 13 and the second side wall 14 of the housing 1 by a welding process. Of course, the casting process, stamping process, and welding process mentioned above are only examples, and the forming process of the housing 1 is not limited thereto. In practice, any reasonable processing process can be applied to the processing of the housing 1 and the protruding structure 16.

[0067] The specific structural features of the above-mentioned protrusion structure 16 will be introduced in detail below and will not be described in detail here.

[0068] In one example, as shown in Figure 9, a motor mounting groove 17 is provided on the wall panel of the shell 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 connected to the above-mentioned accommodating 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.

[0069] 2. Crossflow impeller 2

[0070] The crossflow impeller 2 is a power component in the crossflow blower for driving the gas flow.

[0071] As shown in FIG1 , the crossflow impeller 2 is located in the accommodation space of the housing 1 , and both ends of the crossflow impeller 2 are rotatably connected to the first side wall 13 and the second side wall 14 of the housing 1 , respectively.

[0072] 1 and 2 , the crossflow impeller 2 has a cylindrical structure, and both side end walls of the crossflow impeller 2 in the axial direction are rotatably connected to the first side wall 13 and the second side wall 14 respectively.

[0073] Optionally, the crossflow wind wheel 2 may be composed of a multi-section wind wheel monomer 21 .

[0074] As shown in Figure 3, each rotor section 21 includes a partition wall 211 and multiple leaf plates 212. The crossflow rotor 2 includes multiple partition walls 211, which can be circular in shape, with equal radii and concentrically arranged. Multiple leaf plates 212 are located between every two adjacent partition walls 211. These leaf plates 212 are distributed circumferentially and each leaf plate 212 is an arc-shaped plate.

[0075] In this way, the difficulty of processing the crossflow impeller 2 can be reduced.

[0076] In implementation, referring to Figure 3, for the wind wheel unit 21 (hereinafter referred to as the first wind wheel unit) close to the first side wall 13, since a reference distance is preset between the cross-flow wind wheel 2 and the first side wall 13, part of the gas entering the first wind wheel unit will be diverted to the reference distance, so that the gas flow rate in the first wind wheel unit is reduced.

[0077] Optionally, the number of the blades 212 in each wind rotor unit 21 may be equal, and there may be a phase difference between the blades 212 in two adjacent wind rotor units 21 .

[0078] In this way, the overall performance of the crossflow impeller 2 can be improved.

[0079] 3. Volute 3 and Volute Tongue 4

[0080] The volute 3 and the volute tongue 4 are components used to form a one-way air duct in a cross-flow fan.

[0081] As shown in Figure 2, the volute 3 and volute tongue 4 are both located in and connected to the housing 1. The volute 3, 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 duct 15. The exhaust duct 15 is located between the crossflow impeller 2 and the air outlet 12, and the exhaust duct 15 gradually converges along the airflow direction.

[0082] In one example, the exhaust channel 15 gradually contracts along the airflow direction in the first direction and / or the second direction.

[0083] The first direction is parallel to the axis of the crossflow impeller 2 , and the second direction is perpendicular to the airflow direction.

[0084] The connection methods between the volute 3, the volute tongue 4 and the shell 1 can be the same or different. For example, the volute 3 and the volute tongue 4 are connected to the shell 1 by welding, or the volute 3 and the volute tongue 4 are detachably connected to the shell 1 by bolts.

[0085] In one example, as shown in FIG. 2 , the volute 3 has an arc-shaped plate structure, and the volute 3 and the volute tongue 4 are both perpendicular to the first side wall 13 of the housing 1 .

[0086] For example, as shown in FIG2 , a line connecting the end of the volute 3 away from the air outlet 12 and the end of the volute tongue 4 away from the air outlet 12 may pass through the diameter of the crossflow impeller 2 .

[0087] In this way, the circulating air volume can be reduced while ensuring the air intake volume of the cross-flow fan, thereby improving the efficiency of the cross-flow fan.

[0088] As shown in FIG. 2 , a preset distance is set between the end of the volute 3 away from the air outlet 12 , the end of the volute tongue 4 away from the air outlet 12 and the crossflow impeller 2 .

[0089] In this way, the crossflow impeller 2 can be prevented from coming into contact with the volute 3 and the volute tongue 4, thereby increasing the service life of the crossflow blower.

[0090] In practice, if the value of the preset spacing is too small, the crossflow impeller 2 is likely to come into contact with the volute 3 and the volute tongue 4. If the value of the preset spacing is too large, a large amount of gas may return to the air inlet 11 from the reference spacing during the rotation of the crossflow impeller 2, resulting in low efficiency of the crossflow fan.

[0091] Exemplarily, the value range of the preset spacing may be [2 mm, 5 mm].

[0092] In practice, taking into account the coaxiality error between the cross-flow impeller 2 and the housing 1, when the preset spacing is less than 2 mm, that is, the distance between the end of the volute 3 away from the air outlet 12 and the end of the volute tongue 4 away from the air outlet 12 and the cross-flow impeller 2 is 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. When the preset spacing is greater than 5 mm, that is, the distance between the end of the volute 3 away from the air outlet 12 and the end of the volute tongue 4 away from the air outlet 12 and the cross-flow impeller 2 is 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 is correspondingly reduced. This results in a reduction in the air volume passing through the exhaust duct 15 when the cross-flow impeller 2 is at the same speed, resulting in low efficiency of the cross-flow fan.

[0093] In one example, the preset distance is set to 3.5 mm.

[0094] In this way, it is possible to ensure that the crossflow fan has a higher efficiency while ensuring that the crossflow impeller 2 does not come into contact with the volute 3 and the volute tongue 4, thereby avoiding the generation of noise.

[0095] Optionally, the volute 3 and the volute tongue 4 may both be hollow structures.

[0096] In this way, the overall weight of the cross flow fan can be reduced and the difficulty of assembling the cross flow fan can be reduced.

[0097] Optionally, the cross-flow blower may further include a heat exchange component 5 .

[0098] The heat exchange assembly 5 is a component in the crossflow blower used for performing heat exchange with the gas flowing out of the crossflow impeller 2 .

[0099] 7 , the heat exchange assembly 5 is located in the housing 1 , in the air outlet direction of the exhaust passage 15 , and is connected to the housing 1 .

[0100] In one example, referring to FIG. 7 , the heat exchange assembly 5 includes a plurality of heat exchange tubes 51 and a covering member 52 .

[0101] A refrigerant flows through the heat exchange tube 51 , and the covering member 52 is made of a porous material, so that gas can flow from one side of the covering member 52 to the other side.

[0102] For example, the material of the covering member 52 may be foam, etc., which is not limited in the embodiment of the present application.

[0103] In practice, air enters the crossflow fan through the air inlet 11, then passes through the heat exchange assembly 5 and exits the crossflow fan through the air outlet 12. As the air passes through the heat exchange assembly 5, heat exchange occurs between the air and the heat exchange assembly 5. When the refrigerant temperature in the heat exchanger is lower than the air temperature, the air cools down. When the refrigerant temperature in the heat exchanger is higher than the air temperature, the air heats up. Subsequently, the air that has completed the heat exchange is exited the crossflow fan through the air outlet 12, thereby adjusting the room temperature.

[0104] Optionally, the heat exchange assembly 5 further includes a fixing member 53 .

[0105] 6 , the heat exchange assembly 5 includes two fixing members 53 , wherein one fixing member 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 members 53 are used to fix the heat exchange tube 51 .

[0106] In this way, the connection stability between the heat exchange component 5 and the shell 1 can be improved.

[0107] In the embodiment of the present application, there are many possible structures of the protrusion structure 16, which are described one by one below:

[0108] In some possible embodiments, the protruding structure 16 is connected to the volute tongue 4 .

[0109] As shown in FIG. 3 , the volute tongue 4 has a first flow guiding surface 41 . The first flow guiding surface 41 is a wall surface of the volute tongue 4 close to the volute 3 .

[0110] Optionally, the protruding structure 16 may be cone-shaped.

[0111] In one example, the raised structure 16 can be in the shape of a triangular pyramid. Referring to FIG3 , the vertex of the raised structure 16 is located at the intersection of the first guide surface 41 and the first sidewall 13 , and is located on the side of the first sidewall 13 away from the air outlet 12 . The bottom surface of the raised structure 16 is flush with the wall surface of the volute tongue 4 near the air outlet 12 .

[0112] Thus, raised structure 16 reduces the cross-sectional area of ​​exhaust duct 15 at locations corresponding to low-speed zones, thereby increasing the gas flow rate in these locations, further reducing noise and improving the efficiency of the cross-flow blower. Furthermore, due to the tapered shape of raised structure 16, the cross-sectional area of ​​exhaust duct 15 gradually decreases in the direction of gas flow, stabilizing the flow field distribution within the cross-flow blower, further reducing noise and improving the efficiency of the cross-flow blower.

[0113] Furthermore, the raised 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 raised structure 16 connected to the shell 1, the second wall surface is the wall surface of the raised structure 16 connected to the volute tongue, and the third wall surface is the wall surface of the raised structure 16 located in the exhaust channel 15, that is, the third guide surface 16a of the raised structure 16.

[0114] For example, the first wall surface and the second wall surface may be perpendicular to each other. In other words, the adjacent walls between the volute tongue 4 and the housing 1 may be perpendicular to each other.

[0115] In this way, the difficulty of assembling the housing 1 and the volute tongue 4 can be reduced.

[0116] In this example, the first wall and the second wall are both planes, and the third wall can be a plane or an arc-shaped surface. For example, the third wall can be a concave arc-shaped surface, or the third wall can be a convex arc-shaped surface. This embodiment of the present application does not limit this.

[0117] Referring to Figure 3, the first edge of the triangular pyramid-shaped raised structure 16 extends along the airflow direction in the height direction of the exhaust channel 15 (that is, perpendicular to the axial direction of the cross-flow wind wheel 2) relative to the first guide surface 41, and the second edge of the triangular pyramid-shaped raised structure 16 extends along the airflow direction in the axial direction of the cross-flow wind wheel 2 relative to the first guide surface 41.

[0118] The first edge is an edge of the protruding structure 16 intersecting with the first side wall 13 , and the second edge is an edge of the protruding structure 16 intersecting with the first guide surface 41 .

[0119] Exemplarily, the angle formed by the first edge and the second edge is in the range of 5° to 30°.

[0120] In this way, the first edge and the second edge of the protruding structure 16 can expand to form a third flow guiding surface 16a extending in three-dimensional directions.

[0121] In practice, referring to FIG8 , due to the assembly gap between the crossflow impeller 2 and the end wall of the housing 1 , a low-speed zone forms in the exhaust duct 15 at the transition point between the first guide surface 41 of the volute 4 and the first sidewall 13 (and similarly for the second sidewall 14 ) and near the crossflow impeller 2 . The pressure in the low-speed zone is lower than that in the high-speed zone, and there is an adverse pressure gradient from the low-speed zone to the high-speed zone. This makes it easy for the fluid in the low-speed zone to separate and reflux as it moves toward the air outlet 12 . The separation and reflux phenomenon becomes more severe the further downstream in the airflow direction, resulting in a chaotic flow field and high noise levels within the exhaust duct 15 . By providing the raised structures 16 on the first sidewall 13 and the second sidewall 14 , as described above, this is equivalent to reducing the pipe diameter within the low-speed zone, thereby effectively accelerating the fluid in the low-speed zone and preventing separation and reflux. Moreover, since the vertex of the raised structure 16 is located on the intersection of the first guide surface 41 and the first side wall 13, the third guide surface 16a of the raised structure 16 extends in a three-dimensional direction, and the cross-sectional area of ​​the raised structure 16 perpendicular to the gas flow direction gradually increases. This is equivalent to the smaller the corresponding pipe diameter is closer to the downstream in the low-speed zone, and the size of the pipe diameter is matched with the degree of separation and reflux phenomenon, so that the fluid in the low-speed zone can be accelerated more accurately, so that the flow field in the exhaust channel 15 is stable, thereby reducing noise.

[0122] Referring to FIG10 , through the simulation test results, the above technical solution can greatly improve the stability of the flow field in the exhaust duct 15. Under the condition of the same air volume, the noise at the corresponding position of the same test point in the exhaust duct 15 can be reduced by at least 1dB.

[0123] In one example, the third guide surface 16a of the protruding structure 16 may be an arc-shaped surface.

[0124] In this way, the connection position between the third guide surface 16a of the protruding structure 16 and the shell 1 and the volute tongue 4 can be a smooth transition, thereby reducing the roughness of the connection position between the protruding structure 16 and the shell 1 and the volute tongue 4, and further, avoiding the protruding structure 16 from reducing the gas flow rate at the corresponding position.

[0125] The curvature of the third guide surface 16 a can be set by technicians according to actual needs, and the embodiment of the present application does not limit the curvature of the third guide surface 16 a.

[0126] Optionally, the third guide surface 16a is an arc-shaped surface and a concave surface.

[0127] In this way, the roughness of the third guide surface 16 a is reduced, thereby preventing the protruding structure 16 from reducing the gas flow rate at the corresponding position.

[0128] Optionally, the protruding structure 16 can be integrally formed with the volute tongue 4 .

[0129] In practice, the protruding structure 16 and the volute tongue 4 can be an integrally formed component. Specifically, the two ends of the volute tongue 4 can be provided with protruding structures 16 respectively, and the protruding structures 16 are engaged with the first side wall 13 and the second side wall 14.

[0130] In this way, the difficulty of processing the protruding structure 16 can be reduced, and the difficulty of assembling the volute tongue 4 and the housing 1 can be reduced.

[0131] In some possible embodiments, the protruding structure 16 is connected to the volute 3 .

[0132] As shown in FIG. 4 , the volute 3 has a second flow-guiding surface 31 , which is a wall surface of the volute 3 close to the volute tongue 4 .

[0133] Optionally, the protruding structure 16 may be cone-shaped.

[0134] In one example, the raised structure 16 can be in the shape of a triangular pyramid. Referring to FIG4 , the vertex of the raised structure 16 is located at the intersection of the second guide surface 31 and the first sidewall 13 , and is located on the side of the first sidewall 13 away from the air outlet 12 . The bottom surface of the raised structure 16 is flush with the wall surface of the volute 3 near the air outlet 12 .

[0135] Thus, due to the presence of raised structure 16, the cross-sectional area of ​​exhaust duct 15 at the corresponding location in the low-speed zone (i.e., the corresponding location on the end wall of crossflow impeller 2) is reduced. It is easy to understand that this cross-sectional area can increase the gas flow velocity at the corresponding location, thereby reducing the gas flow from the high-speed zone to the low-speed zone, thereby reducing noise and improving the efficiency of the crossflow blower. Furthermore, due to the tapered shape of raised structure 16, the cross-sectional area of ​​exhaust duct 15 gradually decreases in the direction of gas flow, stabilizing the flow field distribution in the crossflow blower, further reducing noise and improving the efficiency of the crossflow blower.

[0136] Furthermore, the raised structure 16 has a fourth wall, a fifth wall and a sixth wall. The fourth wall is the wall of the raised structure 16 connected to the first side wall 13, the fifth wall is the wall of the raised structure 16 connected to the volute 3, and the sixth wall is the third guide surface 16a of the raised structure 16.

[0137] For example, the fifth wall surface and the sixth wall surface may be perpendicular to each other. In other words, the adjacent walls between the volute 3 and the housing 1 may be perpendicular to each other.

[0138] In this way, the difficulty of assembling the housing 1 and the volute 3 can be reduced.

[0139] In this example, the fourth wall and the fifth wall are both planes, and the sixth wall can be a plane or an arc-shaped surface. For example, the sixth wall can be a concave arc-shaped surface, or the sixth wall can be a convex arc-shaped surface. This embodiment of the present application does not limit this.

[0140] In one example, the third guide surface 16a of the protruding structure 16 may be an arc-shaped surface.

[0141] In this way, the connection position between the third guide surface 16a of the raised structure 16 and the shell 1 and the volute 3 can be a smooth transition, thereby reducing the roughness of the connection position between the raised structure 16 and the shell 1 and the volute 3, and further, avoiding the raised structure 16 from reducing the gas flow rate at the corresponding position.

[0142] The curvature of the third guide surface 16 a can be set by technicians according to actual needs, and the embodiment of the present application does not limit the curvature of the third guide surface 16 a.

[0143] Optionally, the third guide surface 16a is an arc-shaped surface and a concave surface.

[0144] In this way, the roughness of the third guide surface 16 a is reduced, thereby preventing the protruding structure 16 from reducing the gas flow rate at the corresponding position.

[0145] Optionally, the protruding structure 16 may be integrally formed with the volute 3 .

[0146] In practice, the protruding structure 16 and the volute 3 can be an integrally formed component. Specifically, the two ends of the volute 3 can be respectively provided with a protruding structure 16 , and the protruding structure 16 is engaged with the first side wall 13 and the second side wall 14 .

[0147] In this way, the difficulty of processing the protruding structure 16 can be reduced, and the difficulty of assembling the volute 3 and the housing 1 can be reduced.

[0148] In some possible embodiments, the protruding structure 16 is not connected to the volute 3 or the volute tongue 4 .

[0149] As shown in FIG5 , the first side wall 13 has a protruding structure 16 at the position of the exhaust passage 15 . The protruding structure 16 is located between the volute 3 and the volute tongue 4 , and there is a gap between the protruding structure 16 and both the volute 3 and the volute tongue 4 .

[0150] Optionally, the protruding structure 16 may be cone-shaped.

[0151] In one example, the raised structure 16 can be in the shape of a triangular pyramid. The apex of the raised structure 16 is located on the first sidewall 13, and the distance from the apex to the first guide surface 41 is equal to the distance from the apex to the second guide surface 31. The bottom surface of the raised structure 16 is flush with the wall surface of the volute tongue 4 near the air outlet 12.

[0152] Optionally, the raised structure 16 has a seventh wall, an eighth wall and a ninth wall, the seventh wall being the connecting surface between the raised structure 16 and the first side wall 13, the eighth wall and the ninth wall being the guide surfaces of the raised structure 16, and the eighth wall being the guide surface of the raised structure 16 close to the volute 3, and the ninth wall being the guide surface of the raised structure 16 close to the volute tongue 4.

[0153] 5 , the angle formed between the eighth wall surface and the first side wall 13 is an obtuse angle, and the angle formed between the ninth wall surface and the first side wall 13 is also an obtuse angle.

[0154] Thus, raised structure 16 reduces the cross-sectional area of ​​exhaust duct 15 at locations corresponding to low-speed zones, thereby increasing the gas flow rate in these locations, further reducing noise and improving the efficiency of the cross-flow blower. Furthermore, due to the tapered shape of raised structure 16, the cross-sectional area of ​​exhaust duct 15 gradually decreases in the direction of gas flow, stabilizing the flow field distribution within the cross-flow blower, further reducing noise and improving the efficiency of the cross-flow blower.

[0155] Optionally, the angle formed between the eighth wall surface and the first side wall 13 may be equal to the angle formed between the ninth wall surface and the first side wall 13 .

[0156] Illustratively, the angle may range from 120° to 150°.

[0157] 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.

[0158] In one example, the third guide surface 16a of the protruding structure may be an arcuate surface, that is, both the eighth wall surface and the ninth wall surface are arcuate surfaces.

[0159] The curvatures of the eighth wall surface and the ninth wall surface may be the same or different. Technicians may set the curvatures of the eighth wall surface and the ninth wall surface according to actual needs, and this embodiment of the present application does not limit this.

[0160] Optionally, a projected length of the third guide surface 16 a in the axial direction of the crossflow rotor 2 is less than or equal to the rotor diameter of the crossflow rotor 2 .

[0161] In practice, the low-speed zones corresponding to the end walls of the crossflow rotor 2 are relatively narrow in the axial direction of the crossflow rotor 2. Setting the projected length of the third guide surface 16a in the axial direction of the crossflow rotor 2 to be less than or equal to the rotor diameter of the crossflow rotor 2 ensures that the protruding structures 16 affect only the gas velocity in the low-speed zones, without affecting the gas velocity in the high-speed zones.

[0162] In one example, when the crossflow rotor 2 is composed of a multi-section rotor unit 21 , the projected length of the third guide surface 16 a in the axial direction of the crossflow rotor 2 may be less than or equal to the distance between two adjacent partition walls 211 .

[0163] In this way, the protruding structure 16 only affects the gas flow rate of the gas flowing out of the first wind wheel unit, which can ensure that the protruding structure 16 does not affect the gas flow rate in the high-speed area.

[0164] The above description uses the protruding structure 16 on the first side wall 13 as an example. For the structure of the protruding structure 16 on the second side wall, reference may be made to the above description, which will not be repeated here.

[0165] In some possible embodiments, the protruding structures 16 on the first sidewall 13 and the second sidewall 14 are mirror-symmetrical.

[0166] As shown in FIG. 6 , the crossflow impeller 2 has a working surface 100 .

[0167] The working surface 100 is a vertical plane to the axis of the crossflow rotor 2 , and the vertical plane is equidistant from the end walls on both sides of the crossflow rotor 2 .

[0168] In one example, the first side wall 13 has a first protruding structure 161 , and the second side wall 14 has a second protruding structure 162 . The first protruding structure 161 and the second protruding structure 162 are both located in the exhaust channel 15 , and the first protruding structure 161 and the second protruding structure 162 are distributed in a mirror-symmetrical manner about the working surface 100 .

[0169] 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 improved.

[0170] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0171] An embodiment of the present application provides a cross-flow blower, 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 are arranged to form an exhaust channel 15, and the exhaust channel 15 gradually shrinks along the direction of the airflow. In this way, since the exhaust channel 15 gradually shrinks along the direction of the airflow, it is equivalent to gradually reducing the pipe diameter along the direction of the airflow. The pipe diameter in the low-speed zone is reduced. When the gas flow rate does not change, the gas flow rate in the low-speed zone can be increased, thereby reducing the gas flow from the high-speed zone to the low-speed zone and reducing the backflow gas. In addition, the efficiency of the cross-flow blower can be improved and the noise can be reduced.

[0172] An embodiment of the present application provides 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 embodiment of the present application does not limit the type of the air supply device.

[0173] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A crossflow fan, characterized in that: The crossflow fan comprises a housing (1), a crossflow fan wheel (2), a volute (3) and a volute tongue (4); The housing (1) has an air inlet (11) and an air outlet (12); The crossflow fan wheel (2) is located in the shell (1), and two ends of the crossflow fan wheel (2) are rotatably connected to a first side wall (13) and a second side wall (14) of the shell (1), respectively; the first side wall (13) and the second side wall (14) are two opposite side walls in the shell (1); The volute (3) and the volute tongue (4) are both located inside the housing (1), and the volute tongue (4) is located between the crossflow impeller (2) and the air outlet (12); The first side wall (13), the second side wall (14), the volute (3) and the volute tongue (4) are arranged to form an exhaust passage (15), and the exhaust passage (15) gradually contracts along the airflow direction.

2. The crossflow fan according to claim 1, characterized in that: The exhaust passage (15) gradually contracts along the airflow direction in a first direction and / or a second direction, the first direction is parallel to the axis of the crossflow impeller (2), and the second direction is perpendicular to the airflow direction.

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

4. The crossflow fan according to claim 3, characterized in that: The volute tongue (4) has a first flow-guiding surface (41), the first flow-guiding surface (41) is provided with the protruding structure (16), and the first flow-guiding surface (41) is a wall surface of the volute tongue (4) close to the volute casing (3).

5. The crossflow fan according to claim 3, characterized in that: The volute (3) has a second flow-guiding surface (31), the second flow-guiding surface (31) is provided with the protruding structure (16), and the second flow-guiding surface (31) is a wall surface in the volute (3) close to the volute tongue (4).

6. The crossflow fan according to claim 3, characterized in that: There is a gap between the protruding structure (16) and the volute (3) and the volute tongue (4).

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

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

9. The cross flow fan according to claim 7, characterized in that: The arc-shaped 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 protruding structure (161), and the second side wall (14) has a second protruding structure (162); the first protruding structure (161) and the second protruding structure (162) are both located in the exhaust passage (15); the first protruding structure (161) and the second protruding structure (162) are symmetrically distributed on both sides of a working surface (100) of the crossflow wind wheel (2); the working surface (100) is perpendicular to the axis of the crossflow wind wheel (2) and is equidistant from two ends of the crossflow wind wheel (2).

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

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

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