Axial flow fan with function of preventing axial movement of rotor

Abstract

The application discloses an axial flow fan with a function of preventing axial movement of a rotor, which comprises a rotor shell, an inner arc surface of the rotor shell is provided with a containing chamber and has front and rear end faces, an end cover is connected to one side surface of the rotor shell, a rotor shaft is connected to a middle part of the containing chamber of the inner arc surface of the rotor shell, an outer arc surface of the rotor shaft abuts against an inner arc surface of the end cover, a sealing assembly is arranged on one side of the end cover and abuts against a surface of the rotor shaft, and a bearing is movably connected to one end of the rotor shaft. Through the cooperation of the preventing assembly and the spring, a dynamic anti-movement system is constructed. When the rotor shaft is subjected to external forces such as airflow reaction force, electromagnetic force fluctuation and the like and has an axial movement tendency, the spring can rapidly generate corresponding elastic deformation, the reverse force is applied to the rotor shaft, the movement force is effectively offset, and the axial movement displacement is strictly controlled within a very small range.

Description

Technical Field

[0001] This application relates to the field of fan rotors, and more particularly to an axial flow fan with a function to prevent axial movement of the rotor. Background Technology

[0002] Rotor shaft fans typically refer to fans with a rotor shaft as the core transmission component. Their working principle is that the motor drives the rotor shaft to rotate, which in turn drives the impeller blades mounted on the shaft to rotate, thereby generating airflow for blowing or exhausting.

[0003] An internal rotor axial flow fan supplies alternating current to the stator surrounding the rotor via an external power source, generating a rotating magnetic field that drives the inner rotor, made of magnets, to rotate. The fan's main shaft passes through the inner rotor, which in turn drives the fan blades to rotate and generate airflow. However, when the rotor cuts through the magnetic field, it is not only subjected to the magnetic force of the stator directly opposite it, but also to the oblique magnetic force, which makes it prone to axial movement.

[0004] Traditional axial flow fans are inadequate in preventing rotor axial movement. Some fans rely solely on simple mechanical limiting structures to restrict the rotor's axial position, but this method is a rigid constraint. When the rotor moves axially, it will collide with the limiting structure, which can easily damage the rotor and the limiting structure with long-term use, and also generate noise. Utility Model Content

[0005] The main purpose of this application is to provide an axial flow fan with the function of preventing rotor axial movement, which aims to solve the technical problem that rigid restraint and rotor axial movement can easily cause damage to the rotor and limiting structure and generate noise during long-term use.

[0006] To achieve the above objectives, this application provides an axial flow fan with a function to prevent axial movement of the rotor, comprising a rotor housing, an end cover assembly, a rotor shaft, a sealing assembly, a bearing, an anti-axial movement assembly, and a spring. The rotor housing has an inner arc surface with a receiving chamber and front and rear end faces; one side of the end cover assembly is bolted to one end face of the rotor housing; one end of the rotor shaft is connected through to the center of the receiving chamber on the inner arc surface of the rotor housing, and the outer arc surface of the rotor shaft abuts against the inner arc surface of the end cover assembly; the sealing assembly is located near the end cover assembly, and its inner arc surface fits against the surface of the rotor shaft; the bearing is movably connected to one end of the rotor shaft, and the outer arc surface of the bearing is placed at the edge of the inner arc surface of the rotor housing; the anti-axial movement assembly is sleeved in the center of the outer arc surface of the rotor shaft, and the outer arc surface of the anti-axial movement assembly is placed in the center of the receiving chamber; one end of the spring is fixedly installed in the receiving chamber on the inner arc surface of the rotor housing, and the other end abuts against one side of the anti-axial movement assembly.

[0007] Optionally, the end cover assembly includes: a mating surface and a limiting bottom end; wherein the mating surface is disposed on the top of the end cover assembly, and one side surface is in the same plane as the end face of the rotor housing; the limiting bottom end is connected to the lower surface of the end cover assembly, and the inner arc surface of the limiting bottom end is mated to the outer arc surface of the rotor shaft, wherein the mating surface and the end face of the rotor housing are fixedly installed by bolts.

[0008] Optionally, the sealing assembly includes an oil seal terminal and a retaining ring; wherein the inner arc surface of the oil seal terminal abuts against the surface of the rotor shaft; and the outer arc surface of the retaining ring fits against the inner wall of the rotor housing.

[0009] Optionally, an annular protrusion is provided on the top of one side surface of the oil seal terminal, and the outer arc surface of the annular protrusion is placed on one side of the limiting bottom end.

[0010] Optionally, a trapezoidal end is provided on the other side edge of the oil seal terminal, and a partition is provided in the middle of one side surface of the retaining ring, with the outer arc surface of the partition abutting against the inner arc surface of the rotor housing.

[0011] Optionally, the inner arc surface of the retaining ring is provided with a receiving surface, one side of which is adapted to the trapezoidal end on the oil seal terminal.

[0012] Optionally, the prevention component includes a limiting sleeve and a shoulder; wherein, a through hole is provided in the middle of one side surface of the limiting sleeve, and the limiting sleeve is connected to the rotor shaft through the one side through hole; the inner arc surface of the shoulder is sleeved on the limiting sleeve.

[0013] Optionally, the outer arc surface of the limiting sleeve is provided with a cavity groove, and the number of the cavity grooves is two, which are distributed in a mirror symmetrical manner on both sides of the limiting sleeve.

[0014] Optionally, a connecting portion is provided at the inner arc surface edge of the shoulder, and the inner arc surface of the connecting portion is movably engaged with the inner wall of the cavity.

[0015] Optionally, the shoulder is provided with an extension end on the side away from the connecting part, and one side of the extension end is fixedly connected to the spring.

[0016] This application proposes an axial flow fan with a function to prevent rotor axial movement. Through the ingenious cooperation of the anti-axial movement component and the spring, a dynamic anti-axial movement system is constructed. When the rotor shaft is subjected to external forces such as airflow reaction force or electromagnetic force fluctuations, causing an axial movement tendency, the spring can quickly generate corresponding elastic deformation. By applying the reverse force to the rotor shaft, the axial movement force is effectively counteracted, and the axial displacement is strictly controlled within a very small range. A multi-layered sealing protection is formed through the sealing component. The inner arc surface of the sealing component tightly wraps around the rotor shaft, the top is integrally fitted with the end cover, and the outer arc surface fits against the inner wall of the rotor housing. This multi-layered sealing structure effectively prevents external impurities such as dust and moisture from entering the fan. This not only protects the key components preventing rotor axial movement but also reduces component wear caused by impurity intrusion, extends the service life of the internal components of the fan, and reduces maintenance costs and frequency. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the internal structure of the rotor shaft in an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the oblique section three-dimensional structure of the sealing component in the embodiments of this application;

[0019] Figure 3 This is a schematic diagram of the overall structure on the rotor shaft in an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the structure preventing component disassembly in an embodiment of this application;

[0021] Figure 5 This is a schematic diagram of the cross-sectional structure of the component in an embodiment of this application.

[0022] Reference numerals: 1. Rotor housing; 101. Receiving chamber; 2. End cover assembly; 21. Contact surface; 22. Restricting bottom end; 3. Rotor shaft; 4. Sealing assembly; 41. Oil seal terminal; 411. Annular protrusion; 412. Trapezoidal end; 42. Retaining ring; 421. Spacer; 422. Receiving surface; 5. Bearing; 6. Preventing assembly; 61. Restricting sleeve; 611. Cavity; 62. Shaft shoulder; 621. Connecting part; 7. Spring.

[0023] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] Figure 1 This is a cross-sectional view of the rotor shaft in an embodiment of this application, showing its internal structure. Figure 2 This is a schematic diagram of the oblique section three-dimensional structure of the sealing component in the embodiments of this application. Figure 3 This is a schematic diagram of the overall structure on the rotor shaft in an embodiment of this application. Figure 4 This is a schematic diagram of the structure preventing component disassembly in an embodiment of this application. Figure 5 This is a schematic diagram of the cross-sectional structure of the component in an embodiment of this application.

[0029] This application provides an axial flow fan with a function to prevent axial movement of the rotor, such as... Figures 1 to 5 As shown, in an exemplary embodiment, the axial flow fan with rotor axial movement function includes a rotor housing 1, an end cover assembly 2, a rotor shaft 3, a sealing assembly 4, a bearing 5, an anti-rotation assembly 6, and a spring 7. The rotor housing 1 has an inner arc surface with a receiving chamber 101 and has front and rear end faces. One side surface of the end cover assembly 2 is fixedly mounted on one side end face of the rotor housing 1 by bolts. One end of the rotor shaft 3 passes through the rotor shaft 1 and is connected to the middle of the receiving chamber 101 on the inner arc surface of the rotor housing 1. The outer arc surface of the rotor shaft 3 abuts against the inner arc surface of the end cover assembly 2. The sealing assembly 4 is close to the end cover assembly 2, and its inner arc surface is in contact with the surface of the rotor shaft 3. The bearing 5 is movably connected to one end of the rotor shaft 3, and the outer arc surface of the bearing 5 is placed at the edge of the inner arc surface of the rotor housing 1. The anti-corrosion assembly 6 is sleeved in the middle of the outer arc surface of the rotor shaft 3, and the outer arc surface of the anti-corrosion assembly 6 is placed in the middle of the receiving chamber 101. One end of the spring 7 is fixedly mounted in the receiving chamber 101 on the inner arc surface of the rotor housing 1, and the other end abuts against one side of the anti-corrosion assembly 6.

[0030] Specifically, during actual operation of the axial flow fan, the motor outputs a powerful torque to drive the rotor shaft 3 to rotate at high speed, causing the fan blades to rotate at a speed of 1500-3000 revolutions per minute, generating a strong airflow to meet the needs of industrial ventilation, equipment heat dissipation, and other scenarios. During this process, the rotor shaft 3 is subjected to various complex external forces such as airflow reaction force and electromagnetic force fluctuations, which can easily lead to axial movement. Once signs of movement appear, the anti-movement system composed of the anti-movement component 6 and the spring 7 will respond immediately. When the rotor shaft 3 moves forward, the spring 7 is compressed, generating a backward elastic force, which is applied to the rotor shaft 3 through the shaft shoulder 62 and the limiting sleeve 61 to prevent it from continuing to move forward. If the rotor moves backward, the spring 7 stretches, generating a forward pulling force to counteract the backward movement, ensuring that the rotor shaft 3 always remains in the specified axial position. The axial displacement is controlled within the wear range. At the same time, the sealing assembly 4 maintains a good sealing condition at all times, preventing external dust, moisture and other impurities from entering the fan and avoiding impurities from affecting the normal operation of the anti-backlash structure. The bearing 5 provides stable support for the high-speed rotation of the rotor shaft 3, reducing friction and vibration. The end cover assembly 2 and the rotor housing 1 form a robust outer shell to protect the internal components. All components work together to enable the axial flow fan to operate stably for a long time, providing reliable ventilation for industrial production, building ventilation and other fields.

[0031] like Figures 1-3As shown, in an exemplary embodiment, the end cap assembly 2 includes a mating surface 21 and a limiting bottom end 22; wherein, the mating surface 21 is disposed on the top of the end cap assembly 2, and one side surface is in the same plane as the end face of the rotor housing 1; the limiting bottom end 22 is connected to the lower surface of the end cap assembly 2, and the inner arc surface of the limiting bottom end 22 is mated to the outer arc surface of the rotor shaft 3, wherein the mating surface 21 and the end face of the rotor housing 1 are fixedly installed by bolts.

[0032] Specifically, during installation, the mating surface 21 of the end cap assembly 2 is completely aligned with the end face of the rotor housing 1. High-strength bolts are inserted through the pre-drilled holes in the mating surface 21 and screwed into the corresponding holes on the end face of the rotor housing 1 to secure the two tightly. This bolted connection method can withstand greater tension and torque, ensuring a stable connection between the end cap assembly 2 and the rotor housing 1. The limiting bottom end 22 connected to the lower surface of the end cap assembly 2 has an inwardly recessed arc-shaped inner wall that closely fits the outer arc surface of the rotor shaft 3. During installation, workers use specialized measuring tools to ensure that the gap between the two is controlled within a reasonable range. This ensures that the rotor shaft 3 can rotate freely and also provides a preliminary axial limiting effect. It also provides a standard mating plane for the subsequent installation of the sealing assembly 4.

[0033] like Figure 2 and Figure 3 As shown, in an exemplary embodiment, the sealing assembly 4 includes an oil seal terminal 41 and a retaining ring 42; wherein, the inner arc surface of the oil seal terminal 41 abuts against the surface of the rotor shaft 3; the outer arc surface of the retaining ring 42 fits against the inner wall of the rotor housing 1; an annular protrusion 411 is provided on the top of one side surface of the oil seal terminal 41, the outer arc surface of the annular protrusion 411 is placed on one side of the limiting bottom end 22; a trapezoidal end 412 is provided at the other edge of the oil seal terminal 41; a partition 421 is provided in the middle of one side surface of the retaining ring 42, the outer arc surface of the partition 421 abuts against the inner arc surface of the rotor housing 1; the inner arc surface of the retaining ring 42 is provided with a receiving surface 422, one side of the receiving surface 422 is adapted to the trapezoidal end 412 on the oil seal terminal 41.

[0034] Specifically, during the installation of the sealing assembly 4, the oil seal terminal 41 is made of highly elastic rubber material, which is soft and resilient. Its inwardly curved inner arc surface can tightly wrap around the rotor shaft 3. During installation, it is necessary to ensure an interference fit between the two to guarantee the sealing effect. The annular protrusion 411 on the top of the oil seal terminal 41 acts as a raised sealing ring, which is embedded in the groove reserved at the bottom end 22 to form the first sealing barrier, effectively preventing dust and debris from entering the fan from the top. The outer ring of the retaining ring 42 has an outer arc surface that fits tightly with the inner wall of the rotor housing 1. The middle partition 421 abuts against the inner arc surface of the rotor housing 1 to further enhance the seal. At the same time, the bearing surface 422 of the inner arc surface of the retaining ring 42 fits with the trapezoidal end 412 of the oil seal terminal 41. The two are interlocked by the high-precision inclined surfaces pressed by the mold, which improves the overall sealing performance of the sealing assembly 4, prevents external impurities from entering, and protects the anti-slip structure inside the fan for normal operation.

[0035] like Figure 1 , Figures 3-5 As shown, in an exemplary embodiment, the prevention component 6 includes a limiting sleeve 61 and a shoulder 62. The limiting sleeve 61 has a through hole in the middle of one side surface, and the limiting sleeve 61 is connected to the rotor shaft 3 through the through hole. The inner arc surface of the shoulder 62 is sleeved on the limiting sleeve 61. The outer arc surface of the limiting sleeve 61 has a cavity 611. There are two cavities 611, which are distributed in a mirror symmetrical manner on both sides of the limiting sleeve 61. A connecting part 621 is provided at the edge of the inner arc surface of the shoulder 62. The inner arc surface of the connecting part 621 is movably engaged with the inner wall of the cavity 611. An extension end is provided on the side of the shoulder 62 away from the connecting part 621. One side of the extension end is fixedly connected to the spring 7.

[0036] Specifically, to prevent the rotor shaft 3 from passing through the through hole of the limiting sleeve 61 during assembly of component 6, thus achieving a sleeve connection between the two, it is necessary to ensure that the coaxiality error of the two is reduced during installation. The connecting part 621 of the inner arc edge of the shoulder 62 is designed with a special claw shape, which can accurately fit into the symmetrically distributed cavity grooves 611 on both sides of the limiting sleeve 61. During installation, by ensuring that the engagement depth is consistent, the shoulder 62 and the limiting sleeve 61 are firmly connected, as tightly as gears meshing. The extension end of the shoulder 62 away from the connecting part 621 is connected to the spring 7. When the axial flow fan is running, if the rotor shaft 3 has an axial tendency due to airflow impact, electromagnetic force, or other factors, the spring 7 acts like a sensitive shock absorber, quickly generating elastic deformation according to the direction and force of the movement. The reverse force is evenly transmitted to the rotor shaft 3 through the shoulder 62 and the limiting sleeve 61, counteracting the movement force. The symmetrical cavity grooves 611 on both sides ensure that the shoulder 62 is subjected to uniform force, which can effectively prevent the rotor from moving axially even under high-speed rotation and complex stress conditions, ensuring the stable operation of the fan.

[0037] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An axial flow fan with the function of preventing rotor axial movement, characterized in that, include: The rotor housing (1) has an inner arc surface with a receiving chamber (101) and has end faces on the front and rear sides; The end cap is attached to the rotor housing (1) by bolts on one side surface. The rotor shaft (3) is connected at one end through the middle of the receiving chamber (101) on the inner arc surface of the rotor housing (1), and the outer arc surface of the rotor shaft (3) abuts against the inner arc surface of the end cover assembly (2). The sealing assembly (4) is located on the side near the end cap assembly (2), and its inner arc surface is attached to the surface of the rotor shaft (3). The bearing (5) is movably connected to one end of the rotor shaft (3), and the outer arc surface of the bearing (5) is placed at the edge of the inner arc surface of the rotor housing (1); The anti-corrosion component (6) is sleeved on the middle part of the outer arc surface of the rotor shaft (3), and the outer arc surface of the anti-corrosion component (6) is placed in the middle of the receiving chamber (101); The spring (7) is fixedly installed at one end in the inner arc surface receiving chamber (101) of the rotor housing (1), and at the other end abuts against one side of the anti-component (6).

2. The axial flow fan with anti-rotor axial movement function according to claim 1, characterized in that, The end cap assembly (2) includes: The mating surface (21) is set on the top of the end cover assembly (2), and one side surface is in the same plane as the end face of the rotor housing (1). The bottom end (22) is connected to the lower surface of the end cap assembly (2), and the inner arc surface of the bottom end (22) is attached to the outer arc surface of the rotor shaft (3); The mating surface (21) is fixed to the end face of the rotor housing (1) by bolts.

3. The axial flow fan with anti-rotor axial movement function according to claim 1, characterized in that, The sealing assembly (4) includes: The oil seal terminal (41) has its inner arc surface abutting against the surface of the rotor shaft (3); The outer arc surface of the retaining ring (42) is in contact with the inner wall of the rotor housing (1).

4. The axial flow fan with rotor axial movement prevention function according to claim 3, characterized in that, The top of one side surface of the oil seal terminal (41) is provided with an annular protrusion (411), and the outer arc surface of the annular protrusion (411) is placed on one side of the limiting bottom end (22).

5. The axial flow fan with anti-rotor axial movement function according to claim 3, characterized in that, The oil seal terminal (41) has a trapezoidal end (412) on the other side edge, and the retaining ring (42) has a partition (421) in the middle of one side surface, and the outer arc surface of the partition (421) abuts against the inner arc surface of the rotor housing (1).

6. The axial flow fan with anti-rotor axial movement function according to claim 5, characterized in that, The inner arc surface of the retaining ring (42) is provided with a receiving surface (422), and one side of the receiving surface (422) is adapted to the trapezoidal end (412) on the oil seal terminal (41).

7. The axial flow fan with anti-rotor axial movement function according to claim 1, characterized in that, The prevention component (6) includes: The limiting sleeve (61) has a through hole in the middle of one side surface, and the limiting sleeve (61) is connected to the rotor shaft (3) through the through hole on one side. The shoulder (62) has an inner arc surface that fits onto the limiting sleeve (61).

8. The axial flow fan with rotor axial movement prevention function according to claim 7, characterized in that, The outer arc surface of the limiting sleeve (61) is provided with a cavity (611), and there are two cavities (611) which are distributed in a mirror symmetrical manner on both sides of the limiting sleeve (61).

9. The axial flow fan with anti-rotor axial movement function according to claim 7, characterized in that, The inner arc surface edge of the shoulder (62) is provided with a connecting part (621), and the inner arc surface of the connecting part (621) is movably engaged with the inner wall of the cavity (611).

10. The axial flow fan with rotor axial movement prevention function according to claim 9, characterized in that, The shoulder (62) has an extension end on the side away from the connecting part (621), and one side of the extension end is fixedly connected to the spring (7).

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