Once-through fans and ventilation equipment

Abstract

This application relates to a once-through fan and a ventilation system. The once-through fan comprises a housing, a once-through fan impeller, a spiral casing, and a spiral tongue, the housing having an air inlet and an air outlet, the once-through fan impeller being located within the housing and its ends rotatably connected to a first side wall and a second side wall of the housing, the first and second side walls being two opposing side walls within the housing, the spiral casing and the spiral tongue being located within the housing and the spiral tongue being located between the once-through fan impeller and the air outlet. 、 The first side wall, the second side wall, the spiral casing, and the spiral tongue surround each other to form an exhaust duct, and the exhaust duct gradually narrows along the direction of airflow. By adopting this invention, the noise of the through-fan can be reduced.

Description

Technical Field

[0001] <Cross - reference to related cases> This application claims priority from a Chinese patent application with application number 202311678380.X, invention title "Cross - flow fan and air - blowing equipment", filed on December 7, 2023, and the entire content of this Chinese patent application is incorporated herein by reference into this application.

[0002] This application relates to the technical field of electrical equipment, and particularly to cross - flow fans and air - blowing equipment.

Background Art

[0003] The cross - flow fan is composed of a housing, a cross - flow fan impeller, and a scroll casing assembly. The housing has an air inlet and an air outlet. The cross - flow fan impeller is arranged inside the housing and is rotatably connected to two opposite inner walls of the housing via a shaft. The two ports of the scroll casing assembly correspond to the air inlet and the air outlet respectively, and form a one - way flow path between the air inlet and the air outlet.

[0004] Due to the influence of the end walls of the fan impeller, the gas flow velocity in the air - outlet region is symmetrically distributed along the axial direction of the fan impeller. The gas flow velocity at the positions corresponding to both end walls of the fan impeller is low, and the gas flow velocity at the position corresponding to the center of the fan impeller is high.

[0005] However, in the above structure, the gas in the high - speed region flows into the low - speed region, reverse - flow gas is likely to occur, and the noise becomes large.

Summary of the Invention

[0006] Embodiments of this application provide a cross - flow fan and an air - blowing equipment, which can solve the technical problems existing in the related art, and the technical solutions are as follows.

[0007] In a first embodiment, an embodiment of the present application provides a once-through fan comprising a housing, a once-through fan impeller, a spiral casing, and a spiral tongue, wherein the housing has an air inlet and an air outlet, the once-through fan impeller is located within the housing, and both ends of the once-through fan impeller are rotatably connected to a first side wall and a second side wall of the housing, respectively, the first and second side walls being two opposing side walls of the housing, the spiral casing and the spiral tongue both located within the housing, the spiral tongue located between the once-through fan impeller and the air outlet, the first side wall, the second side wall, the spiral casing, and the spiral tongue enclose an exhaust duct, the exhaust duct gradually narrowing along the direction of airflow.

[0008] In one possible embodiment, the exhaust duct gradually narrows along the airflow direction in a first direction and / or a second direction, the first direction being parallel to the axis of the through-fan impeller and the second direction being perpendicular to the airflow direction.

[0009] In one possible embodiment, the first side wall and the second side wall each have a projection structure, and the projection structure is positioned in the exhaust duct.

[0010] In one possible embodiment, the spiral tongue has a first guide surface, the projection structure is provided on the first guide surface, and the first guide surface is a wall surface of the spiral tongue adjacent to the spiral casing.

[0011] In one possible embodiment, the spiral casing has a second guide surface, the projection structure is provided on the second guide surface, and the second guide surface is a wall surface of the spiral casing adjacent to the spiral tongue.

[0012] In one possible embodiment, there is a gap between the projection structure and the spiral tongue, and there is a gap between the projection structure and the spiral casing and the spiral tongue.

[0013] In one possible embodiment, the projection structure is provided with a third guide surface, the third guide surface being a wall surface of the projection structure located in the exhaust duct, and the third guide surface being an arc-shaped surface.

[0014] In one possible embodiment, the length of the third guide surface in the axial direction of the through-fan impeller is less than or equal to the impeller diameter of the through-fan impeller.

[0015] In one possible embodiment, the arc-shaped surface is concave.

[0016] In one possible embodiment, the first side wall has a first projection structure, the second side wall has a second projection structure, both of which are located in the exhaust duct, and the first and second projection structures are symmetrically distributed on both sides of the working surface of the through-fan impeller, the working surface being perpendicular to the axis of the through-fan impeller and equidistant from both ends of the through-fan impeller.

[0017] In one possible embodiment, the through-fan further includes a heat exchange assembly, which is located within the housing and in the exhaust direction of the exhaust duct, and is used to exchange heat with the gas flowing out of the exhaust duct.

[0018] In a second aspect, the embodiments of the present application provide a ventilation system, which includes a through-fan in the first aspect and in feasible embodiments thereof.

[0019] The technical solutions provided by the embodiments of this application include at least the following beneficial effects. Embodiments of this application provide a once-through fan, which includes a housing, a once-through fan impeller, a spiral casing, and a spiral tongue. The first and second side walls of the housing, the spiral casing, and the spiral tongue surround and form an exhaust duct, which gradually narrows along the direction of airflow. In this way, because the exhaust duct gradually narrows along the direction of airflow, the pipe diameter is gradually reduced along the direction of airflow, which is equivalent to reducing the pipe diameter in the low-speed region. This improves the gas flow velocity in the low-speed region while the gas flow rate does not change, thereby reducing the gas flow rate from the high-speed region to the low-speed region, reducing backflow gas, improving the efficiency of the once-through fan, and reducing noise.

[0020] Please understand that the above general description and the following detailed description are for illustrative and illustrative purposes only and do not limit this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the following is a brief introduction to the drawings necessary for describing the embodiments. Clearly, the drawings described below are only a part of the embodiments of this application. Those skilled in the art can obtain other drawings based on these without any creative work. [Brief explanation of the drawing]

[0022] [Figure 1] This is a schematic diagram of the structure of a once-through fan according to an embodiment of this application. [Figure 2] This is a schematic diagram of the structure of a once-through fan according to an embodiment of this application. [Figure 3] This is a schematic diagram of the structure of a once-through fan according to an embodiment of this application. [Figure 4] This is a schematic diagram of the structure of a once-through fan according to an embodiment of this application. [Figure 5] This is a schematic diagram of the structure of a once-through fan according to an embodiment of this application. [Figure 6] This is a schematic diagram of the structure of a once-through fan according to an embodiment of this application. [Figure 7]It is a schematic diagram of the structure of a cross-flow fan according to an embodiment of the present application. [Figure 8] It is a schematic diagram of the structure of a cross-flow fan according to an embodiment of the present application. [Figure 9] It is a schematic diagram of the structure of a cross-flow fan according to an embodiment of the present application. [Figure 10] It is a diagram showing the relationship between noise and air volume in an exhaust duct according to an embodiment of the present application.

Embodiments for Carrying Out the Invention

[0023] In order to more clearly clarify the object, technical solution and advantages of the present application, the embodiments of the present application will be described in more detail below with reference to the drawings.

[0024] Unless otherwise defined, technical terms or scientific terms used in this specification shall have the ordinary meanings understood by those skilled in the technical field to which the present application belongs. Terms such as "first", "second", "third", etc. used in the specification and claims of this patent application do not indicate order, quantity, or importance, but are merely used to distinguish different components. Similarly, similar terms such as "one" or "a" do not indicate a limitation of quantity, but indicate that at least one exists. Similar terms such as "comprising" or "including" mean that the elements or articles appearing before "comprising" or "including" include the elements or articles listed after "comprising" or "including" and their equivalents, and do not exclude other elements or articles. Similar terms such as "connected" or "related" are not limited to physical or mechanical connections, and may include electrical connections whether direct or indirect. "Upper", "lower", "left", "right", etc. are merely used to indicate relative positional relationships, and when the absolute position of the described object changes, the relative positional relationships may also change correspondingly.

[0025] Currently, once-through fans are frequently used in indoor units of household air conditioners due to their advantages such as their compact structure. In the related technology, as shown in Figure 8, the once-through fan includes a housing 1, a once-through fan impeller 2, a spiral casing 3, and a spiral tongue 4, where the housing 1 includes an air inlet 11 and an air outlet 12, the once-through fan impeller 2 is rotatably connected to the inner wall of the housing 1, and the spiral casing 3 and spiral tongue 4 form a unidirectional airflow duct on one side of the once-through fan impeller 2 near the fan exhaust port 12, promoting exhaust from the fan impeller. The gas flow path 200 is formed surrounded by the first side wall 13, the second side wall 14 of the housing 1, the spiral casing 3, and the spiral tongue 4. In the above structure, the once-through fan impeller 2 is rotatably connected to the inner wall of the housing 1, and to account for assembly errors, a mounting gap is generally left between the once-through fan impeller 2 and the inner wall of the housing 1. When the fan impeller rotates, friction exists between the gas inside the fan impeller and the end walls on both sides of the fan impeller. At the same time, some of the gas is diverted into the mounting gap. As a result, in the through-flow fan impeller 2, the gas flow velocity is low near the end walls on both sides and high in the middle, meaning that the gas inside the fan impeller has high-speed and low-speed regions. However, referring to Figure 8, in the axial direction of the through-flow fan impeller 2, the cross-sectional area of ​​the gas flow path 200 corresponding to the high-speed and low-speed regions does not change. As a result, high-speed and low-speed regions still exist even after the gas flows out of the fan impeller. The gas in the high-speed region flows into the low-speed region, easily forming backflow gas, causing turbulence in the flow field inside the blower, which seriously affects the efficiency of the blower and generates a lot of noise.

[0026] Embodiments of this application provide a once-through fan, which, as shown in Figure 2, includes a housing 1, a once-through fan impeller 2, a spiral casing 3, and a spiral tongue 4.

[0027] Here, the housing 1 has an air inlet 11 and an air outlet 12. The through-flow fan impeller 2 is located inside the housing 1, and both ends of the through-flow fan impeller 2 are rotatably connected to the first side wall 13 and the second side wall 14 of the housing 1, respectively, the first side wall 13 and the second side wall 14 being two opposing side walls in the housing 1. The volute casing 3 and the volute tongue 4 are both located inside the housing 1, the volute tongue 4 penetrates between the through-flow fan impeller 2 and the air outlet 12 and is connected to the housing 1. The exhaust duct 15 is formed by enclosing the first side wall 13, the second side wall 14, the volute casing 3 and the volute tongue 4, and the exhaust duct 15 gradually narrows along the direction of airflow.

[0028] In this way, since the exhaust duct gradually narrows along the direction of airflow, the pipe diameter is gradually reduced along the direction of airflow, which is equivalent to reducing the pipe diameter in the low-speed region. This allows for an improvement in the gas flow velocity in the low-speed region while the gas flow rate remains constant. As a result, the gas flow rate from the high-speed region to the low-speed region is reduced, backflow gas is reduced, the efficiency of the through-flow fan is improved, and noise is reduced.

[0029] The following describes each component of a through-flow fan.

[0030] 1. Housing 1

[0031] Housing 1 is a component used to fix and connect other components in a once-through fan.

[0032] In one example, as shown in Figure 1, the housing 1 has a cubic thin plate structure. The housing 1 has a housing space for accommodating a through-flow fan impeller 2, a spiral casing 3, and a spiral tongue 4. The housing 1 is provided with an air inlet 11 and an air outlet 12. A gas flow path 200 is provided between the air inlet 11 and the air outlet 12.

[0033] The shapes of the air inlet 11 and the air outlet 12 may be the same or different. For example, the shapes of both the air inlet 11 and the air outlet 12 may be rectangular, or the shape of the air inlet 11 may be rectangular and the shape of the air outlet 12 may be circular. The embodiments of this application do not limit the shapes of the air inlet 11 and the air outlet 12.

[0034] In implementation, as shown in Figure 2, the air inlet 11 and the air outlet 12 form an air passage, which passes through the through-fan impeller 2. The air passage includes an exhaust duct 15, which is formed by being surrounded by a first side wall 13, a second side wall 14, a spiral casing 3, and a spiral tongue 4. Here, the first side wall 13 and the second side wall 14 are two opposing side walls in the housing 1.

[0035] In one example, the first side wall 13 and the second side wall 14 each have a projection structure 16, and the projection structure 16 is located in the exhaust duct.

[0036] Thus, the projection structure 16 on the first side wall 13 can reduce the cross-sectional area of ​​the low-speed region corresponding to one side of the first side wall 13, which is equivalent to reducing the pipe diameter in the low-speed region. Similarly, the projection structure 16 on the second side wall 14 can reduce the cross-sectional area of ​​the low-speed region corresponding to one side of the second side wall 14, which is equivalent to reducing the pipe diameter in the low-speed region. In a situation where the gas flow rate does not change, the gas flow velocity in the low-speed region can be improved, thereby reducing the gas flow rate from the high-speed region to the low-speed region, reducing backflow gas, improving the efficiency of the through-flow fan, and reducing noise.

[0037] For example, the projection structure 16 and the first side wall 13 and second side wall 14 of the housing 1 may be integrally molded, that is, the projection structure 16 may be machined at the same time as the first side wall 13 and second side wall 14 are machined, and the housing 1 may be machined and formed by, for example, a casting process, and the projection structure 16 may be installed on the first side wall 13 and second side wall 14 of the housing 1, respectively.

[0038] For example, the protruding structure 16 and the first side wall 13 and second side wall 14 of the housing 1 can be formed using a stepwise processing method, that is, after processing and forming the first side wall 13 and second side wall 14, the protruding structure 16 can be attached to the first side wall 13 and second side wall 14 respectively, for example, the housing 1 can be processed and formed by a press process, and then the protruding structure 16 can be welded and fixed to the first side wall 13 and second side wall 14 of the housing 1 by a welding process. Of course, the casting process, press process and welding process mentioned above are merely examples, and the forming process of the housing 1 is not limited to these, and any reasonable processing process being implemented can be applied to the processing of the housing 1 and the protruding structure 16.

[0039] The specific structural features of the aforementioned projection structure 16 will be described in detail below and will not be described in detail here.

[0040] In one example, as shown in Figure 9, a motor mounting groove 17 is provided in a wall plate adjacent to the air outlet 12 and facing the air inlet 11 in the housing 1. The motor mounting groove 17 is used to house a motor, and the motor mounting groove 17 and the housing space are connected via a circular through-hole. The circular through-hole is used to position the output shaft of the motor, thereby driving the rotation of the through-fan impeller 2.

[0041] 2. Through-flow fan impeller 2

[0042] The once-through fan impeller 2 is a power component for driving the gas flow in a once-through fan.

[0043] As shown in Figure 1, the through-flow fan impeller 2 is located in the housing space of the housing 1, and both ends of the through-flow fan impeller 2 are rotatably connected to the first side wall 13 and the second side wall 14 of the housing 1, respectively.

[0044] Referring to Figures 1 and 2, the once-through fan impeller 2 has a cylindrical structure, and the end walls on both sides in the axial direction of the once-through fan impeller 2 are rotatably connected to the first side wall 13 and the second side wall 14, respectively.

[0045] Preferably, the through-flow fan impeller 2 may be composed of multiple individual fan impellers 21.

[0046] As shown in Figure 3, each fan impeller unit 21 includes a partition plate 211 and a plurality of plates 212. The once-through fan impeller 2 includes a plurality of partition plates 211, the shape of which may be circular, and the plurality of partition plates 211 have equal radii and are arranged concentrically. A plurality of plates 212 are placed between two adjacent partition plates 211, and the plurality of plates 212 are distributed along the circumferential direction, and each plate 212 is an arc-shaped plate structure.

[0047] This reduces the difficulty in manufacturing the once-through fan impeller 2.

[0048] In implementation, referring to Figure 3, a fan impeller unit 21 (hereinafter referred to as the first fan impeller unit) adjacent to the first side wall 13 has a predetermined reference interval between the through-flow fan impeller 2 and the first side wall 13. Therefore, some of the gas entering the first fan impeller unit is diverted to the reference interval, reducing the gas flow velocity in the first fan impeller unit.

[0049] Preferably, the number of plates 212 in each individual fan impeller 21 may be equal, and a phase difference exists between the plates 212 of two adjacent individual fan impellers 21.

[0050] This improves the overall performance of the through-flow fan impeller 2.

[0051] III. Spiral casing 3 and spiral tongue 4

[0052] The spiral casing 3 and spiral tongue 4 are components for forming a unidirectional air duct in a through-flow fan.

[0053] As shown in Figure 2, both the spiral casing 3 and the spiral tongue 4 are located inside the housing 1 and connected to the housing 1. The exhaust duct 15 is formed by being surrounded by the spiral casing 3, the spiral tongue 4, the first side wall 13 of the housing 1, and the second side wall 14 of the housing 1. The exhaust duct 15 is located between the through-flow fan impeller 2 and the air outlet 12, and the exhaust duct 15 gradually narrows along the direction of airflow.

[0054] In one example, the exhaust duct 15 gradually narrows along the direction of airflow in the first and / or second direction.

[0055] Here, the first direction is parallel to the axis of the through-flow fan impeller 2, and the second direction is perpendicular to the direction of airflow.

[0056] The connection methods between the spiral casing 3, spiral tongue 4 and the housing 1 may be the same or different. For example, both the spiral casing 3 and spiral tongue 4 may be connected to the housing 1 by welding, or both the spiral casing 3 and spiral tongue 4 may be detachably connected to the housing 1 by bolts.

[0057] In one example, as shown in Figure 2, the spiral casing 3 has an arc-shaped plate structure, and both the spiral casing 3 and the spiral tongue 4 are perpendicular to the first side wall 13 of the housing 1.

[0058] As an example, as shown in Figure 2, the line connecting the end of the spiral casing 3 away from the air outlet 12 and the end of the spiral tongue 4 away from the air outlet 12 can pass through the diameter of the through-fan impeller 2.

[0059] In this way, it is possible to ensure the intake volume of the through-flow fan while simultaneously reducing the circulating air volume, and further improving the efficiency of the through-flow fan.

[0060] As shown in Figure 2, a predetermined distance is set between the end of the spiral casing 3 away from the air outlet 12 and the through-flow fan impeller 2, and a predetermined distance is set between the end of the spiral tongue 4 away from the air outlet 12 and the through-flow fan impeller 2.

[0061] In this way, the once-through fan impeller 2 can avoid contact with the volute casing 3 and volute tongue 4, further extending the service life of the once-through fan.

[0062] In implementation, if the preset interval value is too small, the once-through fan impeller 2 is more likely to come into contact with the vortex casing 3 and vortex tongue 4. If the preset interval value is too large, a large amount of gas may return from the reference interval to the air inlet 11 during the rotation process of the once-through fan impeller 2, resulting in a decrease in the efficiency of the once-through fan.

[0063] For example, the range of the preset interval values ​​may be 2 mm to 5 mm.

[0064] In implementation, considering the coaxiality error between the through-flow fan impeller 2 and the housing 1, if the preset distance is less than 2 mm, that is, if the distance from the end of the spiral casing 3 away from the air outlet 12 to the through-flow fan impeller 2 is less than 2 mm, and the distance from the end of the spiral tongue 4 away from the air outlet 12 to the through-flow fan impeller 2 is less than 2 mm, the through-flow fan impeller 2 is prone to friction and collision with the spiral casing 3 and / or spiral tongue 4 during operation, generating noise. If the pre-set interval is greater than 5 mm, that is, if the distance from the end of the spiral casing 3 away from the air outlet 12 to the through-flow fan impeller 2 is greater than 5 mm, and the distance from the end of the spiral tongue 4 away from the air outlet 12 to the through-flow fan impeller 2 is greater than 5 mm, a large gap exists between the through-flow fan impeller 2 and the surrounding members. As a result, the pressure difference formed during the rotation process of the through-flow fan impeller 2 decreases accordingly, and the amount of air passing through the exhaust duct 15 decreases under the same rotational speed conditions of the through-flow fan impeller 2, resulting in a decrease in the efficiency of the through-flow fan.

[0065] In one example, the value of the pre-set interval is 3.5 mm.

[0066] In this way, noise generation is avoided by ensuring that the once-through fan impeller 2 does not come into contact with the volute casing 3 and volute tongue 4, while simultaneously ensuring high efficiency for the once-through fan.

[0067] Preferably, both the spiral casing 3 and the spiral tongue 4 may be hollow structures.

[0068] In this way, the overall weight of the through-flow fan can be reduced, and the difficulty of assembling the through-flow fan can be reduced.

[0069] Preferably, the through-fan may further include a heat exchange assembly 5.

[0070] The heat exchange assembly 5 is a component in the once-through fan that exchanges heat with the gas flowing out from the once-through rotor 2.

[0071] Referring to Figure 7, the heat exchange assembly 5 is located inside the housing 1, is positioned in the exhaust direction of the exhaust duct 15, and is connected to the housing 1.

[0072] In one example, referring to Figure 7, the heat exchange assembly 5 includes a plurality of heat exchange pipes 51 and a cover 52.

[0073] Here, a refrigerant flows through the heat exchange pipe 51, and the cover 52 is made of a porous material, allowing gas to pass from one side of the cover 52 to the other.

[0074] For example, the material of the cover 52 may be foam or the like, and the embodiments of this application are not limited thereto.

[0075] In the implementation, air enters the once-through fan via the air inlet 11, and then passes through the heat exchange assembly 5 before being discharged from the once-through fan via the air outlet 12. As the air passes through the heat exchange assembly 5, it exchanges heat with the heat exchange assembly 5. If the refrigerant temperature in the heat exchanger is lower than the air temperature, the air is cooled; if the refrigerant temperature in the heat exchanger is higher than the air temperature, the air is heated. The air that has completed heat exchange is then discharged from the once-through fan via the air outlet 12, thereby regulating the room temperature.

[0076] Preferably, the heat exchange assembly 5 further includes a fixing member 53.

[0077] Referring to Figure 6, the heat exchange assembly 5 includes two fixing members 53, one of which is connected to the first side wall 13 and the other fixing member 53 is connected to the second side wall 14, and the fixing members 53 are used to fix the heat exchange pipe 51.

[0078] This improves the connection stability between the heat exchange assembly 5 and the housing 1.

[0079] In the embodiments of this application, the structure of the projection structure 16 can have various configurations, which are described one by one below.

[0080] In some possible embodiments, the projection structure 16 is connected to the spiral tongue 4.

[0081] As shown in Figure 3, the spiral tongue 4 has a first guide surface 41, which is the wall surface of the spiral tongue 4 closest to the spiral casing 3.

[0082] Preferably, the projection structure 16 may be conical in shape.

[0083] In one example, the projection structure 16 may be triangular pyramidal in shape. Referring to Figure 3, the vertex of the projection structure 16 is located on the line of intersection of the first guide surface 41 and the first side wall 13, and is located on one side of the first side wall 13 away from the air outlet 12, and the bottom surface of the projection structure 16 is flush with the wall surface of the spiral tongue 4 that is close to the air outlet 12.

[0084] Thus, the protruding structure 16 can reduce the cross-sectional area of ​​the exhaust duct 15 corresponding to the low-speed region, thereby improving the gas flow velocity in the low-speed region, further reducing noise, and improving the efficiency of the once-through fan. At the same time, because the protruding structure 16 has a conical shape, the cross-sectional area of ​​the exhaust duct 15 gradually decreases in the direction of gas flow, stabilizing the flow field distribution in the once-through fan, further reducing noise, and improving the efficiency of the once-through fan.

[0085] Furthermore, the projection structure 16 has a first wall surface, a second wall surface and a third wall surface, the first wall surface being connected to the housing 1 of the projection structure 16, the second wall surface being connected to the spiral tongue of the projection structure 16, and the third wall surface being located in the exhaust duct 15 of the projection structure 16, that is, the third guide surface 16a of the projection structure 16.

[0086] For example, the first and second wall surfaces may be perpendicular to each other. That is, adjacent wall surfaces between the spiral tongue 4 and the housing 1 may be perpendicular to each other.

[0087] This reduces the difficulty of assembly between the housing 1 and the spiral tongue 4.

[0088] In this example, both the first and second wall surfaces are planar, and the third wall surface may be planar or arcuate; for example, the third wall surface may be a concave arcuate surface, or the third wall surface may be a convex arcuate surface, and the embodiments of this application are not limited thereto.

[0089] Referring to Figure 3, the first side of the triangular pyramidal projection structure 16 extends along the airflow direction in the height direction of the exhaust duct 15 (i.e., perpendicular to the axial direction of the through-flow fan impeller 2) relative to the first guide surface 41, and the second side of the triangular pyramidal projection structure 16 extends along the airflow direction in the axial direction of the through-flow fan impeller 2 relative to the first guide surface 41.

[0090] Here, the first edge is the edge that intersects with the first side wall 13 of the projection structure 16, and the second edge is the edge that intersects with the first guide surface 41 of the projection structure 16.

[0091] For example, the angle between the first and second sides is in the range of 5° to 30°.

[0092] In this way, the first and second edges of the projection structure 16 can be extended to form a third guide surface 16a that extends in the three-dimensional direction.

[0093] In implementation, referring to Figure 8, due to the influence of the assembly gap between the through-flow fan impeller 2 and the end wall of the housing 1, a low-speed region is formed in the exhaust duct 15 at the transition point between the first guide surface 41 of the spiral tongue 4 and the first side wall 13 (similarly the second side wall 14) and in the region close to the through-flow fan impeller 2. The pressure in the low-speed region is lower than the pressure in the high-speed region, and there is a reverse pressure gradient from the low-speed region to the high-speed region with respect to the high-speed region. As a result, separation and backflow are likely to occur as the fluid in the low-speed region moves towards the air outlet 12, and the separation and backflow phenomenon becomes more pronounced downstream along the airflow direction, causing turbulence in the flow field within the exhaust duct 15 and increasing noise. By installing the projection structure 16 on the first side wall 13 and the second side wall 14 (see above), it is equivalent to reducing the size of the pipe diameter in the low-speed region, and further, the fluid in the low-speed region can be effectively accelerated and separation and backflow of the fluid can be prevented. Furthermore, since the apex of the projection structure 16 lies on the intersection line of the first guide surface 41 and the first side wall 13, the third guide surface 16a of the projection structure 16 extends in three dimensions, and the cross-sectional area of ​​the projection structure 16 perpendicular to the gas flow direction gradually increases. This corresponds to the corresponding pipe diameter becoming smaller the closer it is to the downstream in the low-speed region, and the size of the pipe diameter matches the degree of the separation backflow phenomenon, thereby enabling more precise acceleration of the fluid in the low-speed region, stabilizing the flow field in the exhaust duct 15, and thereby reducing noise.

[0094] Referring to Figure 10, the results of the simulation experiment show that by adopting the above technical solution, the stability of the flow field in the exhaust duct 15 can be significantly improved, and the noise at the same test point in the exhaust duct 15 can be reduced by at least 1 dB under the same airflow conditions.

[0095] In one example, the third guide surface 16a of the projection structure 16 may be an arcuate surface.

[0096] In this way, the connection positions between the third guide surface 16a of the projection structure 16 and the housing 1, and between the projection structure 16 and the spiral tongue 4 can transition smoothly, thereby reducing the roughness of the connection positions between the projection structure 16 and the housing 1, and between the projection structure 16 and the spiral tongue 4, and furthermore, preventing the projection structure 16 from reducing the gas flow velocity at the corresponding positions.

[0097] The radii of the third guide surface 16a can be set by a person skilled in the art according to their actual needs, and the embodiments of this application do not limit the radii of the third guide surface 16a.

[0098] Preferably, the third guide surface 16a is an arcuate and concave surface.

[0099] In this way, it is possible to reduce the roughness of the third guide surface 16a and to avoid reducing the gas flow velocity at the corresponding position of the projection structure 16.

[0100] Preferably, the projection structure 16 and the spiral tongue 4 may be formed integrally.

[0101] In implementation, the projection structure 16 and the spiral tongue 4 may be integrally molded parts. Specifically, the projection structure 16 may be installed at both ends of the spiral tongue 4, and the projection structure 16 is engaged with the first side wall 13 and the second side wall 14, respectively.

[0102] In this way, the difficulty of machining the protruding structure 16 can be reduced, and the difficulty of assembling the spiral tongue 4 and the housing 1 can also be reduced.

[0103] In some possible embodiments, the projection structure 16 is connected to the spiral housing 3.

[0104] As shown in Figure 4, the spiral casing 3 has a second guide surface 31, which is the wall surface of the spiral casing 3 closest to the spiral tongue 4.

[0105] Preferably, the shape of the projection structure 16 may be conical.

[0106] In one example, the projection structure 16 may be triangular pyramidal in shape. Referring to Figure 4, the vertex of the projection structure 16 is located on the line of intersection of the second guide surface 31 and the first side wall 13, and is located on one side of the first side wall 13 away from the air outlet 12, and the bottom surface of the projection structure 16 is flush with the wall surface of the spiral casing 3 that is close to the air outlet 12.

[0107] Thus, the presence of the protruding structure 16 reduces the cross-sectional area of ​​the exhaust duct 15 at the corresponding position in the low-speed region (i.e., the corresponding position on the end wall of the once-through fan impeller 2). This reduction in cross-sectional area improves the gas flow velocity at the corresponding position, and further reduces the gas flow rate from the high-speed region to the low-speed region, thus easily understanding how this reduces noise and improves the efficiency of the once-through fan. At the same time, because the protruding structure 16 is conical, the cross-sectional area of ​​the exhaust duct 15 gradually decreases in the direction of gas flow, stabilizing the flow field distribution in the once-through fan, further reducing noise and improving the efficiency of the once-through fan.

[0108] Furthermore, the projection structure 16 has a fourth wall surface, a fifth wall surface, and a sixth wall surface, the fourth wall surface being connected to the first side wall 13 of the projection structure 16, the fifth wall surface being connected to the spiral casing 3 of the projection structure 16, and the sixth wall surface being the third guide surface 16a of the projection structure 16.

[0109] For example, the fifth and sixth walls may be perpendicular to each other. In other words, adjacent walls between the spiral casing 3 and the housing 1 may be perpendicular to each other.

[0110] This reduces the difficulty of assembling the housing 1 and the spiral casing 3.

[0111] In the example, the fourth and fifth walls are both planar, and the sixth wall may be planar or arcuate; for example, the sixth wall may be concave or convex, and the embodiments of this application are not limited thereto.

[0112] In one example, the third guide surface 16a of the projection structure 16 may be a concave arc-shaped surface.

[0113] Thus, the connection position between the third guide surface 16a of the projection structure 16 and the housing 1, and the connection position between the third guide surface 16a of the projection structure 16 and the spiral casing 3 may be a smooth transition shape. This reduces the roughness of the connection position between the projection structure 16 and the housing 1, and between the projection structure 16 and the spiral casing 3, and furthermore, prevents the projection structure 16 from reducing the gas flow velocity at the corresponding position.

[0114] The radii of the third guide surface 16a can be set by a person skilled in the art according to their actual needs, and the embodiments of this application do not limit the radii of the third guide surface 16a.

[0115] Preferably, the third guide surface 16a is an arc-shaped and concave surface.

[0116] In this way, it is possible to reduce the roughness of the third guide surface 16a and to avoid reducing the gas flow velocity at the corresponding position of the projection structure 16.

[0117] Selectively, the projection structure 16 may be molded integrally with the spiral casing 3.

[0118] In implementation, the projection structure 16 and the spiral casing 3 may be integrally molded parts. Specifically, the projection structure 16 may be installed at both ends of the spiral casing 3, and the projection structure 16 will engage with the first side wall 13 and the second side wall 14.

[0119] In this way, the difficulty of machining the protruding structure 16 can be reduced, and the difficulty of assembling the spiral casing 3 and the housing 1 can also be reduced.

[0120] In some possible embodiments, the projection structure 16 is not connected to either the spiral casing 3 or the spiral tongue 4.

[0121] As shown in Figure 5, a projection structure 16 is installed on the first side wall 13 located in the exhaust duct 15. The projection structure 16 is located between the spiral casing 3 and the spiral tongue 4, and there is a gap between the projection structure 16 and the spiral casing 3, and there is also a gap between the projection structure 16 and the spiral tongue 4.

[0122] Preferably, the shape of the projection structure 16 may be conical.

[0123] In one example, the shape of the projection structure 16 may be a triangular pyramidal shape. The vertex of the projection structure 16 is located on the first side wall 13, and the distance from the vertex to the first guide surface 41 is equal to the distance from the vertex to the second guide surface 31. The bottom surface of the projection structure 16 is flush with the wall surface adjacent to the exhaust port 12 of the spiral tongue 4.

[0124] Preferably, the projection structure 16 has a seventh wall surface, an eighth wall surface, and a ninth wall surface, the seventh wall surface being the connecting surface between the projection structure 16 and the first side wall 13, the eighth wall surface and the ninth wall surface both being guide surfaces of the projection structure 16, the eighth wall surface being the guide surface closest to the spiral casing 3 of the projection structure 16, and the ninth wall surface being the guide surface closest to the spiral tongue 4 of the projection structure 16.

[0125] Referring to Figure 5, the angle between the eighth wall and the first side wall 13 is obtuse, and the angle between the ninth wall and the first side wall 13 is also obtuse.

[0126] In this way, the protruding structure 16 can reduce the cross-sectional area of ​​the exhaust duct 15 at the position corresponding to the low-speed region, thereby improving the gas flow velocity at the position corresponding to the low-speed region, further reducing noise and improving the efficiency of the once-through fan. At the same time, because the protruding structure 16 has a conical shape, the cross-sectional area of ​​the exhaust duct 15 gradually decreases in the direction of gas flow, stabilizing the flow field distribution in the once-through fan, further reducing noise and improving the efficiency of the once-through fan.

[0127] Preferably, the angle between the eighth wall and the first side wall 13 may be equal to the angle between the ninth wall and the first side wall 13.

[0128] For example, the range of the included angle may be 120° to 150°.

[0129] In this way, the flow field distribution in the through-flow fan can be stabilized, improving the overall performance of the through-flow fan.

[0130] In one example, the third guide surface 16a of the projection structure may be an arc-shaped surface. That is, both the eighth and ninth wall surfaces are arc-shaped surfaces.

[0131] The radii of the eighth and ninth walls may be the same or different, and those skilled in the art can set the radii of the eighth and ninth walls themselves according to their actual needs, and the embodiments of this application are not limited thereto.

[0132] Selectively, the projected length of the third guide surface 16a in the axial direction of the through-flow fan impeller 2 is less than or equal to the impeller diameter of the through-flow fan impeller 2.

[0133] In implementation, the width of the low-speed region corresponding to the end walls on both sides of the through-flow fan impeller 2 is small in the axial direction of the through-flow fan impeller 2. By setting the projected length of the third flow guide surface 16a in the axial direction of the through-flow fan impeller 2 to be less than or equal to the impeller diameter of the through-flow fan impeller 2, it is possible to ensure that the protruding structure 16 affects only the gas flow velocity in the low-speed region and does not affect the gas flow velocity in the high-speed region.

[0134] In one example, if the through-flow fan impeller 2 is composed of a single multi-barrel fan impeller 21, the projected length of the third flow guide surface 16a in the axial direction of the through-flow fan impeller 2 may be less than or equal to the distance between two adjacent partition plates 211.

[0135] In this way, the protruding structure 16 only affects the gas flow velocity of the gas discharged from the first fan impeller alone, and it is possible to ensure that the protruding structure 16 does not affect the gas flow velocity in the high-speed region.

[0136] In the above description, the projection structure 16 on the first side wall 13 was explained as an example, and the structure of the projection structure 16 on the second side wall can be found in the above description, so the explanation is omitted here.

[0137] In some possible embodiments, the projection structures 16 on the first side wall 13 and the second side wall 14 are mirror symmetric.

[0138] As shown in Figure 6, the through-flow fan impeller 2 has an operating surface 100.

[0139] Here, the working surface 100 is a plane perpendicular to the axis of the through-flow fan impeller 2, and the distance between this vertical plane and the end walls on both sides of the through-flow fan impeller 2 is equal.

[0140] In one example, the first side wall 13 has a first projection structure 161, and the second side wall 14 has a second projection structure 162. Both the first projection structure 161 and the second projection structure 162 are located within the exhaust duct 15, and the first projection structure 161 and the second projection structure 162 are distributed mirror-symmetrically with respect to the operating surface 100.

[0141] In this way, the symmetry of the flow field distribution in a once-through fan can be improved, thereby enhancing the overall performance of the once-through fan.

[0142] The technical solutions provided by the embodiments of this application include at least the following beneficial effects. The embodiments of this application provide a once-through fan. The once-through fan includes a housing 1, a once-through fan impeller 2, a volute casing 3, and a volute tongue 4. The exhaust duct 15 is formed by enclosing the first side wall 13, the second side wall 14 of the housing, the volute casing 3, and the volute tongue 4, and the exhaust duct 15 gradually narrows along the direction of airflow. In this way, because the exhaust duct 15 gradually narrows along the direction of airflow, the pipe diameter is gradually reduced along the direction of airflow, which corresponds to reducing the pipe diameter in the low-speed region. If the gas flow rate does not change, the gas flow velocity in the low-speed region can be improved, thereby reducing the gas flow rate from the high-speed region to the low-speed region, reducing backflow gas, further improving the efficiency of the once-through fan, and reducing noise.

[0143] Embodiments of this application provide a ventilation system, which includes the through-fan, and the ventilation system may be an air conditioner or a tower fan; embodiments of this application do not limit the type of ventilation system.

[0144] The foregoing are merely selectable embodiments of this application and do not limit it. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should all be included within the scope of protection of this application. [Explanation of symbols]

[0145] 1 Housing 11 Air Inlet 12 Air outlet 13. First side wall 14. Second side wall 15 Exhaust duct 16 Protrusion structure 17 Motor mounting groove 161 First protrusion structure 162 Second protrusion structure 16a Third guide surface 2. Through-flow fan impeller 21 Fan impeller unit 211 Partition plate 212 Plate 3. Spiral casing 31 Second guide surface 4. Spiral tongue 41 First guide surface 5 Heat exchange assembly 51 Heat exchange pipe 52 Cover 53 Fixing members, 100 Operating surface 200 Gas flow path

Claims

1. A once-through fan comprising a housing (1), a once-through fan impeller (2), a spiral casing (3), and a spiral tongue (4), The housing (1) has an air inlet (11) and an air outlet (12), The once-through fan impeller (2) is located within the housing (1), and both ends of the once-through fan impeller (2) are rotatably connected to the first side wall (13) and the second side wall (14) of the housing (1), respectively, and the first side wall (13) and the second side wall (14) are two opposing side walls within the housing (1). The spiral casing (3) and the spiral tongue (4) are both located within the housing (1), and the spiral tongue (4) is positioned between the through-fan impeller (2) and the air outlet (12). The exhaust duct (15) is formed by being surrounded by the first side wall (13), the second side wall (14), the spiral casing (3), and the spiral tongue (4), and the exhaust duct (15) gradually narrows along the direction of airflow, in a through-flow fan.

2. The once-through fan according to claim 1, characterized in that the exhaust duct (15) gradually narrows along the airflow direction in a first direction and / or a second direction, the first direction being parallel to the axis of the once-through fan impeller (2), and the second direction being perpendicular to the airflow direction.

3. The first side wall (13) and the second side wall (14) each have a projection structure (16), and the projection structure (16) is arranged within the exhaust duct (15), characterized in that the once-through fan according to claim 1.

4. The once-through fan according to claim 3, characterized in that the spiral tongue (4) has a first guide surface (41), the projection structure (16) is provided on the first guide surface (41), and the first guide surface (41) is a wall surface of the spiral tongue 4 that is close to the spiral casing (3).

5. The once-through fan according to claim 3, characterized in that the spiral casing (3) has a second guide surface (31), the projection structure (16) is provided on the second guide surface (31), and the second guide surface (31) is a wall surface of the spiral casing (3) that is close to the spiral tongue (4).

6. The once-through fan according to claim 3, characterized in that there is a gap between the projection structure (16) and the spiral casing (3), and a gap between the projection structure (16) and the spiral tongue (4).

7. The once-through fan according to claim 3, wherein the projection structure (16) is provided with a third guide surface (16a), the third guide surface (16a) is the wall surface of the projection structure (16) located in the exhaust duct (15), and the third guide surface (16a) is an arc-shaped surface.

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

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

10. The once-through fan according to claim 3, characterized in that the first side wall (13) has a first projection structure (161), the second side wall (14) has a second projection structure (162), both the first projection structure (161) and the second projection structure (162) are arranged within the exhaust duct (15), the first projection structure (161) and the second projection structure (162) are arranged symmetrically on both sides of the operating surface (100) of the once-through fan impeller (2), the operating surface (100) is perpendicular to the axis of the once-through fan impeller (2) and is a surface equidistant from both ends of the once-through fan impeller (2).

11. The once-through fan according to claim 1, wherein the once-through fan impeller includes a heat exchange assembly (5), the heat exchange assembly (5) is located in the housing (1) and positioned toward the air outlet of the exhaust duct (15), and the heat exchange assembly (5) is used to exchange heat with the gas flowing out of the exhaust duct (15).

12. A ventilation system characterized by comprising a through-flow fan as described in any one of claims 1 to 11.

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