A crossflow fan with a special shape

Abstract

The application discloses a special-shaped cross-flow fan, which comprises a main shaft, a shell, an impeller, a motor and a shaft coupling. The main shaft is connected with the output shaft of the motor through the shaft coupling. The shell is connected with the main shaft. The impeller is connected with the main shaft. The shell is C-shaped and is an axial asymmetric structure. The impeller is an axial symmetric structure. A part of the impeller is located inside the shell. The shell comprises an upper end plate, an upper side wall, a lower side wall and a lower end plate which are sequentially fixed and connected from top to bottom. The upper end plate is a disc. The central hole of the upper end plate is connected with the upper end of the main shaft through a bearing. The upper end surface of the upper side wall is fixedly connected with the partial circumference of the lower surface of the upper end plate. The lower end plate is a stepped disc. The central hole of the upper part of the lower end plate is connected with the lower end of the main shaft through a bearing. The lower end surface of the lower side wall is fixedly connected with the partial circumference of the upper surface of the lower end plate. The lower end surface of the upper side wall is fixedly connected with the upper end surface of the lower side wall. The application greatly reduces the functional loss by changing the structure of the shell and the impeller.

Description

Technical Field

[0001] This invention belongs to the field of fluid machinery, and specifically relates to a non-standard crossflow fan. Background Technology

[0002] Common fans can be categorized by blade shape and airflow pattern into various types, including axial fans, centrifugal fans, and crossflow fans. Crossflow fans, with their unrestricted axial length, allow for flexible impeller length selection to suit different applications. They also boast higher dynamic pressure and stable exhaust airflow, achieving high-speed, wide-range, and smooth airflow. Therefore, crossflow fans have a wide range of applications, including cooling, ventilation, household appliances, and aircraft. The biggest advantage of crossflow fans compared to traditional fans is their customizable length, which aligns with the characteristics of fixed-wing aircraft wings, making fan-wing aircraft a hot research topic.

[0003] Chinese patent CN212057507U (publication date: December 1, 2020) discloses a fixed impeller crossflow fan, in which the impeller rotation is symmetrical. The generated airflow needs to be guided by a guide shroud to flow in a predetermined direction. However, forcing the airflow to change direction inevitably generates power consumption. Chinese patent CN113653653A (publication date: November 16, 2021) discloses a semi-rotating crossflow fan impeller, in which the blade rotation has unique asymmetrical rotation characteristics, allowing the airflow to autonomously change direction during flow, thereby reducing power consumption. However, it has the problems of a relatively complex transmission structure, which to some extent increases power consumption and noise, and increases the difficulty of practical application. Summary of the Invention

[0004] The problem this invention aims to solve is to provide an irregularly shaped crossflow fan that significantly reduces energy loss by modifying the structure of the casing and impeller. Simultaneously, it can generate greater axial lift and radial thrust, thereby expanding the application range of crossflow fans.

[0005] The present invention discloses a non-standard crossflow fan, which includes a main shaft, a housing, an impeller, a motor, and a coupling; the main shaft is connected to the output shaft of the motor through the coupling, the housing is connected to the main shaft, and the impeller is connected to the main shaft. The housing is C-shaped and has an axially asymmetrical structure, while the impeller has an axisymmetric structure, with a portion of the impeller located inside the housing.

[0006] Furthermore, the outer casing includes an upper end plate, an upper side wall, a lower side wall, and a lower end plate, which are fixedly connected from top to bottom. The upper end plate is a disc, and its central hole is connected to the upper end of the main shaft through a bearing. The upper end face of the upper side wall is circumferentially fixedly connected to a portion of the lower surface of the upper end plate. The lower end plate is a stepped disc, and its upper central hole is connected to the lower end of the main shaft through a bearing. Its middle part is fitted outside the coupling, and its lower flange is fixedly connected to the motor. The lower end face of the lower side wall is circumferentially fixedly connected to a portion of the upper surface of the lower end plate. The lower end face of the upper side wall is fixedly connected to the upper end face of the lower side wall. The outer diameter of the upper end plate is smaller than the outer diameter of the upper part of the lower end plate.

[0007] Furthermore, the upper sidewall is part of the side surface of a frustum of a circle formed by thin plates, and the outer radius of its upper end is the same as the outer radius of the upper end plate; the lower sidewall is part of the side surface of an inverted frustum of a circle formed by thin plates, and the outer radius of its lower end is the same as the outer radius of the lower end plate; the outer radius of the lower end of the upper sidewall is the same as the outer radius of the upper end of the lower sidewall.

[0008] Furthermore, the sector angle of the upper sidewall relative to the circumference of the upper end plate is the same as the sector angle of the lower sidewall relative to the circumference of the lower end plate, both being sector angles of the outer shell, with the sector angle of the outer shell being greater than 135° and less than 180°.

[0009] Furthermore, the housing also includes multiple flow guide square holes, which are evenly distributed along the circumference of the circumference connecting the upper and lower sidewalls.

[0010] Furthermore, the impeller includes an upper hub, a lower hub, and multiple irregular blades. The upper hub is fitted onto the main shaft, and the lower hub is fitted onto the main shaft. The upper and lower ends of each irregular blade are fixedly connected to the outer cylindrical surface of the upper hub and the outer cylindrical surface of the lower hub, respectively. The multiple irregular blades are evenly distributed circumferentially along the axis of the main shaft.

[0011] Furthermore, the irregular blade includes an upper crossbeam A, an upper leaf element B, a lower leaf element C, and a lower crossbeam D. The upper crossbeam A and the lower crossbeam D are square flat plates of uniform thickness. The upper crossbeam A and the lower crossbeam D are parallel to each other and perpendicular to the main shaft. The left end faces of the upper crossbeam A and the lower crossbeam D are connected to the upper hub and the lower hub, respectively. The upper leaf element B is an inclined flat plate from the upper left to the lower right, and its upper left end face is connected to the upper crossbeam A. The lower leaf element C is an inclined flat plate from the lower left to the upper right, and its lower left end face is connected to the lower crossbeam D. The lower right end face of the upper leaf element B and the upper right end face of the lower leaf element C are connected.

[0012] Furthermore, the thickness of upper leaf pigment B gradually increases from the upper left to the lower right; the thickness of lower leaf pigment C gradually increases from the lower left to the upper right; the thickness of the lower right end face of upper leaf pigment B is the same as the thickness of the upper right end face of lower leaf pigment C.

[0013] Furthermore, the semi-cone angle of the upper sidewall's right circular frustum is A1, and the semi-cone angle of the lower sidewall's inverted circular frustum is A2; the angle between the upper leaf element and the main axis is A1, and the angle between the lower leaf element and the main axis is A2.

[0014] Furthermore, the number of irregular blades N = 8 to 16, and the thickness of multiple irregular blades is the same.

[0015] The advantages of this irregular crossflow fan are: 1. The C-shaped outer casing and axially asymmetric structure allow the airflow to transition at different points at a gentler angle, thus reducing kinetic energy loss due to airflow impact; 2. The outer casing is axially non-uniform, while the impeller is axisymmetric and irregularly shaped, causing the airflow to flow in a predetermined direction after entering through the casing. This results in an uneven flow field and pressure difference along the radial direction of the impeller on the circumference of the casing, generating eccentric vortices and low-pressure zones inside the impeller. Therefore, the irregular crossflow fan can generate significant axial lift and radial thrust as the impeller speed increases, enabling its application in various situations; 3. The impeller blades are uniformly distributed along the axis of rotation, exhibiting good dynamic balance and adapting to high-speed rotation; 4. The guide square holes on the sidewalls of the outer casing can, on the one hand, capture localized high-speed airflow, and on the other hand, adjust the flow field and pressure difference on the circumference of the casing by adjusting the size of the square holes, thereby regulating the output high-speed airflow and the generated radial and axial thrust. Attached Figure Description

[0016] Figure 1 This is a front view of the irregular crossflow fan of the present invention;

[0017] Figure 2 This is a top view of the irregular crossflow fan of the present invention;

[0018] Figure 3 This is a left view of the irregular crossflow fan of the present invention;

[0019] Figure 4 This is a schematic diagram of the shape of the blade. Detailed Implementation

[0020] The advantages, features, and implementation methods of the present invention will become clearer through the detailed description of the embodiments below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be embodied in various different forms. These embodiments are provided only to fully disclose the present invention and to completely disclose the scope of the present invention to those skilled in the art. The scope of protection of the present invention is determined solely by the scope of the claims.

[0021] The present invention will now be described in detail through embodiments thereof and with reference to the accompanying drawings illustrating the irregular crossflow fan.

[0022] Example 1

[0023] The present invention provides a non-standard crossflow fan, comprising a main shaft 1, a housing 2, an impeller 3, a motor 4, and a coupling 5; the main shaft 1 is connected to the output shaft of the motor 4 via the coupling 5, the housing 2 is connected to the main shaft 1, the impeller 3 is connected to the main shaft 1, the housing 2 is C-shaped and has an axially asymmetrical structure, the impeller 3 has an axisymmetric structure, and a portion of the impeller 3 is located inside the housing 2.

[0024] The working principle of the irregular crossflow fan of this invention is as follows: During operation, the outer casing 2 remains stationary, and the motor 4 drives the impeller 3 to rotate at high speed relative to the outer casing 2 through the coupling 5. When the impeller 3 rotates, the input airflow W1 enters from the upper part of the impeller 3 and exits from the lower part of the impeller 3, forming a velocity gradient. At the same time, a significant low-pressure eccentric vortex is formed in the radial and axial directions (especially the axial direction) inside the impeller 3, thereby generating a low-pressure zone inside the irregular crossflow fan. This causes a pressure difference between the inner and outer surfaces of the upper and lower end plates of the outer casing 2, thus generating horizontal aerodynamic force Fx and vertical aerodynamic force Fy.

[0025] The advantages of this irregular crossflow fan are: 1. Because the momentum changes differently depending on the angle at which the fluid encounters the sidewall, changing the sidewall angle can alter the pressure; the C-shaped outer casing 2 allows the airflow to change angles at different points, thus reducing kinetic energy loss due to airflow impact; 2. The axially asymmetric structure of the outer casing 2 further reduces aerodynamic losses; 3. Fixed impeller rotation simplifies transmission, naturally reducing energy consumption compared to a half-rotation crossflow fan; 4. The combination of the axially asymmetric structure of the outer casing 2 and the axisymmetric structure of the impeller 3 directs the airflow through the outer casing 2 in a predetermined direction. Therefore, this irregular crossflow fan generates both horizontal aerodynamic force Fx and vertical aerodynamic force Fy upon the input airflow, and both aerodynamic forces are relatively large, thus enabling its widespread application in the liquid field.

[0026] Example 2

[0027] The present invention relates to a cross-flow fan of the irregular shape: the outer shell 2 includes an upper end plate 2a, an upper side wall 2b, a lower side wall 2c, and a lower end plate 2d, which are fixedly connected from top to bottom; the upper end plate 2a is a disc, the central hole of which is connected to the upper end of the main shaft 1 through a bearing, and the upper end surface of the upper side wall 2b is fixedly connected to a portion of the lower surface of the upper end plate 2a; the lower end plate 2d is a stepped disc, the central hole of which is connected to the lower end of the main shaft 1 through a bearing, the middle part of which is fitted outside the coupling 5, and the flange of which is fixedly connected to the motor 4; the lower end surface of the lower side wall 2c is fixedly connected to a portion of the upper surface of the lower end plate 2d; the lower end surface of the upper side wall 2b is fixedly connected to the upper end surface of the lower side wall 2c; the outer diameter of the upper end plate 2a is smaller than the outer diameter of the upper part of the lower end plate 2d.

[0028] Rolling bearings are installed between the upper end plate 2a and the lower end plate 2d and the main shaft 1. The rolling bearings are axially positioned by the shaft shoulder and the shaft retaining ring of the main shaft 1.

[0029] The outer shell 2, which is fixedly connected by the upper end plate 2a, upper side wall 2b, lower side wall 2c, and lower end plate 2d, is C-shaped. Without rotating, the input airflow W1 enters from the upper part of the impeller 3 and exits from the lower part of the impeller 3, and the output airflow W2 is discharged. During this process, the input airflow W1 flows in a predetermined direction, resulting in a large horizontal aerodynamic force Fx and a vertical aerodynamic force Fy, which greatly reduces the power consumption generated.

[0030] In addition, since the lower end plate 2d has a larger contact area, the lower end plate 2d is subjected to greater aerodynamic force than the upper end plate 2a, thereby generating a larger axial lift force, i.e., an upward vertical aerodynamic force Fy.

[0031] Example 3

[0032] The irregular crossflow fan of the present invention: the upper sidewall 2b is a part of the side surface of a frustum of a circle formed by thin plates, and the outer radius of its upper end is the same as the outer radius of the upper end plate 2a; the lower sidewall 2c is a part of the side surface of an inverted frustum of a circle formed by thin plates, and the outer radius of its lower end is the same as the outer radius of the lower end plate 2d; the outer radius of the lower end of the upper sidewall 2b is the same as the outer radius of the upper end of the lower sidewall 2c.

[0033] Given that the outer diameters of the upper end plate 2a and the lower end plate 2d are fixed, the upper side wall 2b and the lower side wall 2c are partial sides of a frustum, which can maximize the distance between the outer shell 2 and the main shaft 1, thereby increasing the values ​​of the horizontal aerodynamic force Fx and the vertical aerodynamic force Fy.

[0034] Example 4

[0035] The irregular crossflow fan of the present invention: the sector angle of the upper sidewall 2b on the circumference of the upper end plate 2a is the same as the sector angle of the lower sidewall 2c on the circumference of the lower end plate 2d, both of which are sector angles of the outer shell 2. The sector angle of the outer shell 2 is greater than 135° and less than 180°.

[0036] The sector angle of the outer shell 2 is between 135° and 180°, which can ensure that more input airflow W1 enters and better improve the values ​​of horizontal aerodynamic force Fx and vertical aerodynamic force Fy.

[0037] Example 5

[0038] The present invention relates to a cross-flow fan with an irregular shape: the outer casing 2 further includes multiple guide holes 2e, and the guide holes 2e are evenly distributed along the circumference of the circumference where the upper sidewall 2b and the lower sidewall 2c are connected. The number of guide holes is 1 to 4.

[0039] Since the internal fluid pressure is high at the connection between the upper sidewall 2b and the lower sidewall 2c, a guide square hole 2e is set here. On the one hand, it can obtain local high-speed airflow, and on the other hand, the size of the square hole can be used to adjust the flow field and pressure difference on the circumference of the shell, thereby adjusting the direction and magnitude of the output high-speed airflow and the generated horizontal aerodynamic force Fx, and thus indirectly adjusting the magnitude of the vertical aerodynamic force Fy.

[0040] Example 6

[0041] The present invention relates to a cross-flow impeller: the impeller 3 includes an upper hub 3a, a lower hub 3c, and multiple irregularly shaped blades 3b. The upper hub 3a is fitted onto the main shaft 1 and pressed tightly against the lower end face of the upper bearing. The lower hub 3c is fitted onto the main shaft 1 and pressed tightly against the upper end face of the lower bearing. The upper and lower ends of each irregularly shaped blade 3b are fixedly connected to the outer cylindrical surface of the upper hub 3a and the outer cylindrical surface of the lower hub 3c, respectively. The multiple irregularly shaped blades 3b are evenly distributed circumferentially along the axis of the main shaft 1.

[0042] An upper hub 3a, blades 3b, and a lower hub 3c are sequentially fixedly connected to form a rigid impeller 3 with an axisymmetric structure. The impeller 3 is laterally installed into the housing 2. The upper hub 3a and the lower hub 3c are circumferentially positioned to the main shaft 1 using flat keys.

[0043] The irregularly shaped blades 3b of the impeller 3 are uniformly distributed along the rotation axis of the main shaft 1, theoretically with no eccentric mass, resulting in good dynamic balance performance of the impeller and its ability to adapt to high-speed rotation. In addition, there is a non-uniform flow field and pressure difference along the radial direction of the impeller 3 on the circumference of the outer casing 2, thereby generating radial thrust, i.e., horizontal aerodynamic force Fx.

[0044] Example 7

[0045] The present invention relates to a cross-flow fan with an irregular blade: the irregular blade 3b includes an upper crossbeam A, an upper blade element B, a lower blade element C, and a lower crossbeam D. The upper crossbeam A and the lower crossbeam D are square flat plates of uniform thickness. The upper crossbeam A and the lower crossbeam D are parallel to each other and perpendicular to the main shaft 1. The left end faces of the upper crossbeam A and the lower crossbeam D are respectively connected to the upper hub 3a and the lower hub 3c. The upper blade element B is an inclined flat plate from the upper left to the lower right, and its upper left end face is connected to the upper crossbeam A. The lower blade element C is an inclined flat plate from the lower left to the upper right, and its lower left end face is connected to the lower crossbeam D. The lower right end face of the upper blade element B and the upper right end face of the lower blade element C are connected.

[0046] The irregularly shaped blade 3b, formed by connecting the upper crossbeam A, upper blade element B, lower blade element C, and lower crossbeam D, is C-shaped. When the blades of the irregularly shaped blade 3b impeller are flat plates, the value of the axial lift, i.e., the vertical aerodynamic force Fy, which increases with the impeller speed, can be further enhanced.

[0047] Example 8

[0048] The present invention is a cross-flow fan with the following characteristics: the thickness of the upper leaf element B gradually increases from the upper left to the lower right; the thickness of the lower leaf element C gradually increases from the lower left to the upper right; the thickness of the lower right end face of the upper leaf element B is the same as the thickness of the upper right end face of the lower leaf element C.

[0049] The tilting of the upper blade element B and the lower blade element C allows the radius between the impeller 3 and the main shaft 1 to be as large as possible, thereby better improving the value of the horizontal aerodynamic force Fx.

[0050] Example 9

[0051] The irregular crossflow fan of the present invention has the following characteristics: the semi-cone angle of the upper sidewall 2b is A1, and the semi-cone angle of the lower sidewall 2c is A2; the angle between the upper leaf element B and the main shaft 1 is A1, and the angle between the lower leaf element C and the main shaft 1 is A2.

[0052] The semi-cone angle A1 is preferably 65° and the semi-cone angle A2 is preferably 40°.

[0053] The included angle of the upper leaf element B is the same as the semi-cone angle of the upper sidewall 2b; the included angle of the lower leaf element C is the same as the semi-cone angle of the lower sidewall 2c. This ensures that the gap between the impeller blades and the sidewall of the outer casing is uniform, thus ensuring smooth airflow.

[0054] Example 10

[0055] The present invention is a cross-flow fan with irregular shapes: the number of irregular blades 3b is N = 8 to 16, and the thickness of multiple irregular blades 3b is the same.

[0056] The specific number of blades N is determined based on the application of the irregular crossflow fan and the values ​​of the horizontal aerodynamic force Fx and the vertical aerodynamic force Fy that need to be generated.

[0057] The housing and impeller in this invention can be precision cast as a whole or 3D printed.

[0058] The working principle of the irregular crossflow fan of this invention is as follows: When the irregular crossflow fan is running, the outer casing remains stationary, and the motor drives the impeller to rotate at high speed relative to the outer casing. Regardless of the impeller's direction of rotation, gas flows in from the upper part of the impeller and flows out from the lower part, forming a velocity gradient. This creates a significant low-pressure eccentric vortex in the radial and axial directions (especially the axial direction) inside the impeller, thereby generating a low-pressure zone inside the irregular crossflow fan. This creates a pressure difference between the inner and outer surfaces of the upper and lower end plates of the outer casing. Because the lower end plate has a larger contact area, it experiences a greater aerodynamic force than the upper end plate, thus generating an upward axial lift.

[0059] The advantages of this irregular crossflow fan are: 1. The C-shaped outer casing and axially asymmetric structure allow for a gradual change in the angle of airflow transition at different nodes, thus reducing kinetic energy loss due to airflow impact; 2. The outer casing has an axially non-uniform structure, while the impeller has an axisymmetric and irregular structure, causing the airflow to flow in a predetermined direction after entering through the casing. This results in an uneven flow field and pressure difference along the radial direction of the impeller on the circumference of the casing, generating eccentric vortices and low-pressure zones inside the impeller. Therefore, the irregular crossflow fan can generate significant axial lift and radial thrust as the impeller speed increases, enabling its application in various situations; 3. The impeller blades are uniformly distributed along the axis of rotation, resulting in good dynamic balance and adaptability to high-speed rotation; 4. The guide square holes on the sidewalls of the outer casing can, on the one hand, capture localized high-speed airflow, and on the other hand, adjust the flow field and pressure difference on the circumference of the casing by adjusting the size of the square holes, thereby regulating the output high-speed airflow and the generated radial and axial thrust. In summary, this invention has a simple structure and high efficiency in converting airflow into thrust.

[0060] This invention utilizes a C-shaped shell with an axially non-uniform structure and an axisymmetric, irregularly shaped impeller to generate eccentric vortices and low-pressure zones within the impeller. This produces significantly larger axial and radial airflow and corresponding aerodynamic forces compared to existing crossflow fans, making it a promising candidate for applications in fluid machinery. For example, when the irregularly shaped crossflow fan is installed on a drone, the horizontal aerodynamic force Fx can serve as thrust, and the vertical aerodynamic force Fy can serve as lift. It can also be used as a simple propulsion device, such as a thruster for underwater robots. Of course, a simpler application is as a ventilation system.

Claims

1. An irregularly shaped crossflow fan, characterized by: It includes a main shaft (1), a housing (2), an impeller (3), a motor (4), and a coupling (5); the main shaft (1) is connected to the output shaft of the motor (4) through the coupling (5), the housing (2) is connected to the main shaft (1), the impeller (3) is connected to the main shaft (1), the housing (2) is C-shaped and axially asymmetrical, the impeller (3) is axially symmetrical, and a part of the impeller (3) is located inside the housing (2); the housing (2) includes an upper end plate (2a), an upper side wall (2b), a lower side wall (2c), and a lower end plate (2d) that are fixedly connected from top to bottom; the upper end plate (2a) is a disc, and its central hole is connected to the main shaft (4) through a bearing (1). The upper end of the upper sidewall (2b) is connected to the lower end of the upper end plate (2a) with a portion of the circumference fixedly connected; the lower end plate (2d) is a stepped disc, with its upper central hole connected to the lower end of the main shaft (1) through a bearing, its middle part sleeved outside the coupling (5), and its lower flange fixedly connected to the motor (4). The lower end of the lower sidewall (2c) is connected to the upper end of the lower end plate (2d) with a portion of the circumference fixedly connected, and the lower end of the upper sidewall (2b) is fixedly connected to the upper end of the lower sidewall (2c). The outer diameter of the upper end plate (2a) is smaller than the outer diameter of the upper part of the lower end plate (2d). The upper sidewall (2b) is a portion of the side surface of a frustum of circles formed by thin plates, and its upper sidewall is connected to the lower end of the main shaft (1). The outer radius of the end is the same as the outer radius of the upper end plate (2a); the lower side wall (2c) is part of the side of the inverted frustum formed by the thin plate, and the outer radius of its lower end is the same as the outer radius of the lower end plate (2d); the outer radius of the lower end of the upper side wall (2b) is the same as the outer radius of the upper end of the lower side wall (2c); the impeller (3) includes an upper hub (3a), a lower hub (3c), and multiple irregular blades (3b). The upper hub (3a) is fitted on the main shaft (1), and the lower hub (3c) is fitted on the main shaft (1). The upper and lower ends of each irregular blade (3b) are fixedly connected to the outer cylindrical surface of the upper hub (3a) and the outer cylindrical surface of the lower hub (3c), respectively. A number of irregular blades (3b) are evenly distributed circumferentially along the axis of the main shaft (1); the irregular blades (3b) include an upper crossbeam A, an upper leaf element B, a lower leaf element C, and a lower crossbeam D. The upper crossbeam A and the lower crossbeam D are square flat plates of uniform thickness. The upper crossbeam A and the lower crossbeam D are parallel to each other and perpendicular to the main shaft (1). The left end faces of the upper crossbeam A and the lower crossbeam D are connected to the upper hub (3a) and the lower hub (3c) respectively. The upper leaf element B is an inclined flat plate from the upper left to the lower right, and its upper left end face is connected to the upper crossbeam A. The lower leaf element C is an inclined flat plate from the lower left to the upper right, and its lower left end face is connected to the lower crossbeam D. The lower right end face of the upper leaf element B and the upper right end face of the lower leaf element C are connected.

2. The irregular crossflow fan according to claim 1, characterized in that: The sector angle of the upper sidewall (2b) relative to the circumference of the upper end plate (2a) is the same as the sector angle of the lower sidewall (2c) relative to the circumference of the lower end plate (2d), both being sector angles of the outer shell (2). The sector angle of the outer shell (2) is greater than 135° and less than 180°.

3. The irregular crossflow fan according to claim 1, characterized in that: The outer casing (2) also includes multiple flow guide square holes (2e), and the flow guide square holes (2e) are evenly distributed along the circumference of the circumference connecting the upper sidewall (2b) and the lower sidewall (2c).

4. The irregular crossflow fan according to claim 1, characterized in that: The thickness of upper leaf pigment B gradually increases from the upper left to the lower right; the thickness of lower leaf pigment C gradually increases from the lower left to the upper right; the thickness of the lower right end face of upper leaf pigment B is the same as the thickness of the upper right end face of lower leaf pigment C.

5. The irregular crossflow fan according to claim 1, characterized in that: The semi-cone angle of the upper sidewall (2b) frustum is A1, and the semi-cone angle of the lower sidewall (2c) frustum is A2; the angle between the upper leaf element B and the main axis (1) is A1, and the angle between the lower leaf element C and the main axis (1) is A2.

6. The irregular crossflow fan according to claim 1, characterized in that: The number of irregular blades (3b) is N=8~16, and the thickness of multiple irregular blades (3b) is the same.

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