Axial flow fan

Abstract

The utility model relates to an axial flow fan, and relates to the field of ventilation equipment, the axial flow fan comprises an inner rotor motor and a guide wheel structure, the inner rotor motor comprises a shell, a stator, a rotor and the guide wheel structure, the stator is fixed in the shell, the rotor is located in the shell, and the rotor and the stator are arranged at intervals; the rotor is rotationally connected with the inner wall of the shell through the guide wheel structure, and the guide wheel structure is used for limiting the rotor in the axial direction and the radial direction; the impeller structure comprises a rim and a plurality of blades, the rim is fixedly connected with the rotor, an air channel is formed in the rim and forms an inlet and an air outlet in the shell, the blades are distributed around the axis of the air channel at intervals, and each blade is fixedly connected with the inner wall of the air channel. Only the blades are arranged in the air duct, and no other connecting parts are arranged, so that the influence of other connecting parts on the flow rate of air in the air duct is avoided, and the air outlet amount of the axial flow fan is increased.

Description

Technical Field

[0001] This application relates to the technical field of ventilation equipment, and in particular to an axial flow fan. Background Technology

[0002] An axial flow fan is a ventilation device that uses the rotation of an impeller to push air along the axial direction. The impeller of an axial flow fan is usually composed of multiple blades. When the motor drives the impeller to rotate, the blades generate thrust on the air, causing the air to move along the axial direction of the fan, thereby promoting air circulation. However, when a high-power motor is required to drive the fan, the size of the selected motor will inevitably increase. The motor that drives the blades is generally located in the middle of the fan duct. Due to the size of the motor, the flow rate of the gas in the duct will be seriously affected, which in turn will affect the air volume of the fan. Summary of the Invention

[0003] In view of this, this application provides an axial flow fan to solve the problem that the motors driving the blades are generally located in the middle of the fan duct, and the size of the motor will seriously affect the flow rate of the gas in the duct, thus affecting the air volume of the fan.

[0004] This application provides an axial flow fan, comprising:

[0005] An internal rotor motor includes a housing, a stator, a rotor, and a guide wheel structure. The stator is fixed inside the housing, and the rotor is located inside the housing and spaced apart from the stator. The rotor is rotatably connected to the inner wall of the housing through the guide wheel structure. The guide wheel structure is used to limit the rotor in the axial and radial directions.

[0006] The impeller structure includes a rim and multiple blades. The rim is fixedly connected to the rotor. The rim has an air duct. The air duct forms an inlet and an outlet on the housing. The multiple blades are spaced apart around the axis of the air duct, and each blade is fixedly connected to the inner wall of the air duct.

[0007] Beneficial effects: The stator is fixedly connected to the inner wall of the housing, while the rotor is spaced apart from the stator and rotatably connected via a guide wheel structure. This guide wheel structure limits the rotor's movement in both the axial and radial directions, reducing vibration during operation and thus improving its stability and reliability. The rim has an air duct, with blades distributed around the duct axis and fixedly connected to the inner wall. The duct contains only blades and no other connecting parts, avoiding the influence of other connecting parts on the gas flow velocity within the duct, ensuring smooth airflow and increasing the output air volume of the axial flow fan.

[0008] In one optional embodiment, the rotor includes a first annular track, a second annular track, and a cylindrical member, wherein the first annular track is connected to the second annular track through the cylindrical member, and the wheel rim is fixedly connected to the inner wall of the cylindrical member;

[0009] The impeller structure includes a first positioning wheel and a second positioning wheel spaced apart. The first positioning wheel has the function of rolling around the first annular track, and the second positioning wheel has the function of rolling around the second annular track, and limiting the cylindrical component in the axial direction.

[0010] Beneficial effects: The first and second positioning wheels roll around the first and second circular tracks respectively, limiting the axial movement of the cylindrical component. This makes the connection between the rotor and the impeller structure more stable, reduces the rotor's axial movement during operation, and improves the overall stability of the fan.

[0011] In one optional embodiment, the rotor further includes a third annular track and a fourth annular track spaced apart, both of which are sleeved on the outer periphery of the cylindrical member;

[0012] The impeller structure also includes a third positioning wheel and a fourth positioning wheel spaced apart. In the working state, the third positioning wheel rolls around the third annular track, and the fourth positioning wheel rolls around the fourth annular track, thereby limiting the radial direction of the cylindrical component.

[0013] Beneficial effects: The third and fourth positioning wheels roll in conjunction with the third and fourth circular tracks, respectively, reducing the radial offset or vibration of the cylindrical component, thereby improving the reliability of the entire fan structure, reducing operating noise and extending the service life of the equipment.

[0014] In one optional embodiment, the inner wall of the housing is provided with a first bracket and a second bracket, the first positioning wheel and the third positioning wheel are rotatably connected to the first bracket, and the second positioning wheel and the fourth positioning wheel are rotatably connected to the second bracket.

[0015] Beneficial effects: The first and second supports provide support and rotational connection for the first and third positioning wheels, as well as the second and fourth positioning wheels, respectively, thereby limiting the rotor's position in both the axial and radial directions. This improves the rotor's stability during operation, reduces mechanical wear and energy loss caused by positional misalignment, and ultimately enhances the overall operating efficiency and reliability of the fan.

[0016] In one optional embodiment, the first bracket, the first positioning wheel, and the third positioning wheel constitute a first positioning group, and multiple first positioning groups are distributed at intervals around a first circumference, with the center of the first circumference located on the axis of the cylindrical member.

[0017] The second bracket, the second positioning wheel, and the fourth positioning wheel constitute a second positioning group. Multiple second positioning groups are distributed at intervals around a second circumference, and the center of the second circumference is located on the axis of the cylindrical component.

[0018] Beneficial effects: The arrangement of the first and second positioning groups ensures that the rotor receives uniform support force at multiple points, effectively reducing rotor sway and vibration during operation and improving the stability and reliability of the fan. Furthermore, this multi-point support structure can disperse the stress generated during rotor operation, extending the fan's service life.

[0019] In an optional embodiment, the rotor further includes a first magnet group, which includes a plurality of first magnets. An annular groove is formed on the outer wall of the cylindrical member. The plurality of first magnets are distributed at intervals around the axis of the annular groove, and each first magnet is fixedly connected to the inner wall of the annular groove.

[0020] In one alternative embodiment, the stator includes a toroidal core and a stator winding. The toroidal core is fixedly connected to the inner wall of the housing, and the stator winding is wound around the toroidal core. The stator winding is inserted into the annular groove and spaced apart from the first magnet group.

[0021] In an optional embodiment, the rotor further includes a second magnet group, which is located on both sides of the stator winding, the second magnet group and the first magnet group being located on the same side. The second magnet group includes a plurality of second magnets, which are spaced apart around the axis of the annular groove, and each second magnet is fixedly connected to the inner wall of the annular groove.

[0022] Beneficial effects: By adopting the above technical solution, the dual magnet assembly creates a symmetrically distributed magnetic field structure on both sides of the rotor's circular winding assembly, improving the motor's magnetic flux density and magnetic force utilization. This increases the motor's output torque and power density, enabling the fan to achieve higher operating efficiency within the same volume.

[0023] In one alternative embodiment, the internal rotor motor is a permanent magnet synchronous motor.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By adopting an internal rotor motor and guide wheel structure to achieve a hollow design, the air duct area is increased, energy loss is reduced, the efficiency and power factor of the fan are improved, and the operating noise is reduced at the same time;

[0026] 2. The rotor and impeller are directly connected, combined with the axial flux dual rotor single stator structure, which significantly reduces the size and weight of the equipment, simplifies the installation and maintenance process, and improves assembly flexibility;

[0027] 3. The guide wheel structure limits the rotor in the axial and radial directions, effectively reducing mechanical and electrical shocks, improving the reliability and stability of the fan operation, and extending the service life of the equipment. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the axial flow fan in this application;

[0029] Figure 2 This is a schematic diagram of the axial flow fan in this application with part of the casing removed;

[0030] Figure 3 This is a cross-sectional view of the axial flow fan in this application.

[0031] Explanation of reference numerals in the attached drawings: 101, housing; 1012, first support; 1013, second support; 102, stator; 1021, stator winding; 1031, cylindrical component; 1032, first annular track; 1033, second annular track; 1034, third annular track; 1035, fourth annular track; 1036, first magnet; 1037, second magnet; 1041, first positioning wheel; 1042, second positioning wheel; 1043, third positioning wheel; 1044, fourth positioning wheel; 1051, rim; 1052, blade. Detailed Implementation

[0032] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0036] This application discloses an axial flow fan, such as... Figures 1 to 3 As shown, the device includes an internal rotor motor and an impeller structure. The internal rotor motor includes a housing 101, a stator 102, a rotor, and a guide wheel structure. The stator 102 is fixed inside the housing 101, and the rotor is located inside the housing 101 and spaced apart from the stator 102. The rotor is rotatably connected to the inner wall of the housing 101 through the guide wheel structure, which is used to limit the rotor in the axial and radial directions. The impeller structure includes a rim 1051 and multiple blades 1052. The rim 1051 is fixedly connected to the rotor and has an air duct inside. The air duct forms an inlet and an outlet on the housing 101. The multiple blades 1052 are spaced apart around the axis of the air duct, and each blade 1052 is fixedly connected to the inner wall of the air duct.

[0037] The axial flow fan provided in this embodiment, such as Figure 1 As shown, the interior of the housing 101 is hollow to reduce weight and provide installation space for the guide wheel structure, stator 102, rotor, wheel rim 1051, and multiple blades 1052. Air inlets and outlets are provided on both sides of the housing 101; the air inlets are for drawing in gas, and the air outlets are for blowing out gas. Figure 2 and Figure 3As shown, stator 102 is the stator winding in a permanent magnet synchronous motor. Specifically, stator 102 includes a toroidal iron core and a stator winding 1021. The outer ring of the toroidal iron core is fixedly connected to the inner wall of the housing 101 by means of bolts, clips, or welding. The stator winding 1021 includes multiple wires wound around the toroidal iron core, and each wire is fitted with an insulating sleeve to reduce eddy current losses between different wires. The winding method of stator winding 1021 adopts the winding method of stator winding in a permanent magnet synchronous motor, which will not be described in detail here.

[0038] The axial flow fan provided in this embodiment has a rotor that is a magnet rotor in a permanent magnet synchronous motor. Specifically, the rotor includes a first annular track 1032, a second annular track 1033, a third annular track 1034, a fourth annular track 1035, a cylindrical component 1031, a first magnet group, and a second magnet group, as shown below. Figure 2As shown, the first annular track 1032 is connected to the second annular track 1033 via a cylindrical member 1031. That is, the first annular track 1032 and the second annular track 1033 are located at the left and right ends of the cylindrical member 1031, respectively. Both the first annular track 1032 and the second annular track 1033 have a U-shaped cross-section. The guide wheel structure includes a first positioning wheel 1041 and a second positioning wheel 1042 spaced apart. The first positioning wheel 1041 has a groove on its surface, and a protrusion is located at the center of the bottom of the groove. This protrusion is used to insert into the first annular track 1032. The groove has two... The sidewalls are designed to fit against the two outer sidewalls of the first annular track 1032. They are engaged with the first annular track 1032 via protrusions, and the two inner sidewalls of the grooves respectively fit against the two outer sidewalls of the first annular track 1032. This arrangement improves the stability of the first positioning wheel 1041 rolling on the first annular track 1032 and reduces the risk of the first positioning wheel 1041 disengaging from the first annular track 1032. The engagement method between the second positioning wheel 1042 and the second annular track 1033 is the same as that between the first positioning wheel 1041 and the first annular track 1032, and will not be described further here. The first annular track 1032 and the second annular track 1033 are made of high-strength stainless steel, and their surfaces are polished to reduce frictional resistance. When the rotor rotates, both the first and second annular tracks rotate accordingly, causing the corresponding first positioning wheel 1041 to roll around the first annular track and the second positioning wheel 1042 to roll around the second annular track. The third and fourth circular tracks 1034 and 1035 are spaced apart, and both the third and fourth rings are fitted around the outer periphery of the cylindrical component 1031. The cross-sections of the third and fourth circular tracks 1034 and 1035 are both U-shaped. The guide wheel structure also includes a third positioning wheel 1043 and a fourth positioning wheel 1044 spaced apart. The way the third positioning wheel 1043 cooperates with the third circular track 1034 is the same as the way the first positioning wheel 1041 cooperates with the first circular track 1032. The way the fourth positioning wheel 1044 cooperates with the fourth circular track 1035 is the same as the way the first positioning wheel 1041 cooperates with the first circular track 1032. These details will not be repeated here. The third and fourth annular tracks 1034 and 1035 are made of high-strength stainless steel with polished surfaces to reduce frictional resistance. When the rotor rotates, both tracks rotate, causing the corresponding third positioning wheel 1043 to roll around the third track and the fourth positioning wheel 1044 to roll around the fourth track. The first positioning wheel 1041 and the second positioning wheel 1042 roll around the first and second annular tracks 1032 and 1033 respectively, providing axial restraint to the cylindrical component 1031. This makes the connection between the rotor and impeller structure more stable, reduces axial movement of the rotor during operation, and improves the overall stability of the fan.The third positioning wheel 1043 and the fourth positioning wheel 1044 cooperate with the third circular track 1034 and the fourth circular track 1035 respectively to roll, reducing the radial offset or vibration of the cylindrical component 1031, thereby improving the reliability of the entire fan structure, reducing operating noise, and extending the service life of the equipment. The introduction of the guide wheel structure makes the rotor more stable during operation, reducing mechanical vibration and noise. The overall structure is compact, easy to install, reliable in operation, and energy-efficient. Compared with traditional asynchronous motor driven fans, the fan in this embodiment has higher efficiency and lower energy consumption, and is suitable for ventilation and equipment heat dissipation in fully mechanized coal mining faces.

[0039] like Figure 2 As shown, the axial flow fan provided in this embodiment has a first support 1012 and a second support 1013 on the inner wall of the housing 101. The first support 1012 and the second support 1013 can be integrally formed with the housing 101, or they can be fixedly connected to the housing 101 by bolts, snap-fits or other fixing means. The first positioning wheel 1041 and the third positioning wheel 1043 are rotatably connected to the first support 1012 by pins. The first support 1012, the first positioning wheel 1041 and the third positioning wheel 1043 form a first positioning group. Multiple first positioning groups are distributed at intervals around a first circumference. The center of the first circumference is located on the axis of the cylindrical member 1031. The first circumference is the outer diameter of the connection position between the first support 1012 and the housing 101. The second positioning wheel 1042 and the fourth positioning wheel 1044 are rotatably connected to the second support 1013 by pins, and the other end is fixedly connected to the bearing seat of the positioning wheel. The second support 1013, the second positioning wheel 1042, and the fourth positioning wheel 1044 constitute the second positioning group. Multiple second positioning groups are distributed at intervals around a second circumference, the center of which lies on the axis of the cylindrical component 1031. The second circumference is the outer diameter of the connection point between the second support 1013 and the housing 101. The arrangement of the first and second positioning groups ensures that the rotor receives uniform support force at multiple points, effectively reducing rotor sway and vibration during operation and improving the stability and reliability of the fan. Furthermore, this multi-point support structure can disperse the stress generated during rotor operation, extending the service life of the fan.

[0040] like Figure 2 As shown, the axial flow fan provided in this embodiment, such as Figure 3As shown, the cylindrical component 1031 has a straight channel inside, and the inner wall of the straight channel is fixedly connected to the rim 1051. The fixing method can be bolts, clips, or welding. The rim 1051 is made of high-strength aluminum alloy material, which has good strength and corrosion resistance to extend its service life. The inner wall of the rim 1051 has multiple mounting holes for fixed connection with the inner wall of the straight channel. The blade 1052 is made of composite material, such as glass fiber reinforced composite material, which has the characteristics of being lightweight and high-strength, thereby reducing the load on the motor drive and increasing the speed of the fan. The root of the blade 1052 has reinforcing ribs to enhance the connection strength. The blade 1052 is installed by plug-in connection, and the blade 1052 is fixed to the air duct of the rim 1051 by bolts.

[0041] like Figure 2 As shown, the outer wall of the cylindrical member 1031 has a protrusion, which is annular and located in the middle section of the cylindrical member 1031. An annular groove is formed on the outer annular surface of the protrusion. The rotor also includes a first magnet group and a second magnet group. The first magnet group includes multiple first magnets 1036, which are spaced apart around the axis of the annular groove, and each first magnet 1036 is fixedly connected to the inner wall of the annular groove. The second magnet group and the first magnet group are located on opposite sides of the stator winding 1021. The second magnet group includes multiple second magnets 1037, which are spaced apart around the axis of the annular groove, and each second magnet 1037 is fixedly connected to the inner wall of the annular groove.

[0042] Specifically, both the first magnet 1036 and the second magnet 1037 are made of permanent magnet material. The arrangement of the first magnet 1036 and the second magnet 1037 is the same as that of the permanent magnet synchronous motor. The first magnet 1036 and the second magnet 1037 are installed by adhesive bonding, using a high-performance adhesive to fix them to the inner wall of the annular groove. The first and second magnet groups are spaced apart, and the stator winding 1021 is inserted into the annular groove, located between the first and second magnet groups. The dual magnet groups create a symmetrically distributed magnetic field structure on both sides of the stator winding 1021, improving the motor's magnetic flux density and magnetic force utilization. This increases the motor's output torque and power density, enabling the fan to achieve higher operating efficiency within the same volume.

[0043] In this embodiment, the internal rotor motor is a permanent magnet synchronous motor. Compared with the asynchronous motor, the internal rotor motor is smaller in size, and the advantage of size also brings the advantage of weight. On the other hand, it brings the advantage of assembly. The smaller space occupation makes it more possible to assemble, and the lighter weight allows it to be assembled by hand in a larger power range without the need for tools such as cranes.

[0044] The fan provided in this embodiment reduces energy loss during transmission and improves the efficiency of the entire transmission system. It also reduces operational failures, lowers maintenance costs, and enhances the reliability and stability of the fan during operation.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An axial flow fan, characterized in that, include: An internal rotor motor includes a housing (101), a stator (102), a rotor, and a guide wheel structure. The stator (102) is fixed inside the housing (101), and the rotor is located inside the housing (101) and spaced apart from the stator (102). The rotor is rotatably connected to the inner wall of the housing (101) through the guide wheel structure. The guide wheel structure is used to limit the rotor in the axial and radial directions. The impeller structure includes a rim (1051) and multiple blades (1052). The rim (1051) is fixedly connected to the rotor. The rim (1051) has an air duct. The air duct forms an inlet and an outlet on the housing (101). The multiple blades (1052) are spaced apart around the axis of the air duct, and each blade (1052) is fixedly connected to the inner wall of the air duct.

2. The fan according to claim 1, characterized in that, The rotor includes a first annular track (1032), a second annular track (1033), and a cylindrical member (1031). The first annular track (1032) is connected to the second annular track (1033) through the cylindrical member (1031), and the wheel rim (1051) is fixedly connected to the inner wall of the cylindrical member (1031). The guide wheel structure includes a first positioning wheel (1041) and a second positioning wheel (1042) spaced apart. The first positioning wheel (1041) has a working state in which it rolls around the first circular track, and the second positioning wheel (1042) rolls around the second circular track, and limits the cylindrical member (1031) in the axial direction.

3. The fan according to claim 2, characterized in that, The rotor also includes a third annular track (1034) and a fourth annular track (1035) spaced apart, both of which are sleeved on the outer periphery of the cylindrical member (1031); The impeller structure also includes a third positioning wheel (1043) and a fourth positioning wheel (1044) spaced apart. In the working state, the third positioning wheel (1043) rolls around the third annular track (1034), and the fourth positioning wheel (1044) rolls around the fourth annular track (1035) and limits the upper limit of the cylindrical member (1031) in the radial direction.

4. The fan according to claim 3, characterized in that, The inner wall of the housing (101) is provided with a first bracket (1012) and a second bracket (1013). The first positioning wheel (1041) and the third positioning wheel (1043) are rotatably connected to the first bracket (1012), and the second positioning wheel (1042) and the fourth positioning wheel (1044) are rotatably connected to the second bracket (1013).

5. The fan according to claim 4, characterized in that, The first bracket (1012), the first positioning wheel (1041), and the third positioning wheel (1043) form a first positioning group. Multiple first positioning groups are distributed at intervals around a first circumference, and the center of the first circumference is located on the axis of the cylindrical member (1031). The second bracket (1013), the second positioning wheel (1042), and the fourth positioning wheel (1044) form a second positioning group. Multiple second positioning groups are distributed at intervals around a second circumference, and the center of the second circumference is located on the axis of the cylindrical member (1031).

6. The fan according to any one of claims 2-5, characterized in that, The rotor also includes a first magnet group, which includes a plurality of first magnets (1036). The outer wall of the cylindrical member (1031) is provided with an annular groove. The plurality of first magnets (1036) are distributed at intervals around the axis of the annular groove, and each first magnet (1036) is fixedly connected to the inner wall of the annular groove.

7. The fan according to claim 6, characterized in that, The stator (102) includes a circular iron core and a stator winding (1021). The circular iron core is fixedly connected to the inner wall of the housing (101). The stator winding (1021) is wound around the circular iron core and inserted into the annular groove, and is spaced apart from the first magnet group.

8. The fan according to claim 7, characterized in that, The rotor also includes a second magnet group, which is located on both sides of the stator winding (1021) along with the first magnet group. The second magnet group includes a plurality of second magnets (1037), which are spaced apart around the axis of the annular groove, and each second magnet (1037) is fixedly connected to the inner wall of the annular groove.

9. The fan according to claim 7, characterized in that, The internal rotor motor is a permanent magnet synchronous motor.

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