Axial anti-locking fan structure

Abstract

The axial anti-locking fan structure is suitable for dispersing the locking force of a main shaft of an axial flow fan, the axial flow fan comprises a shell, the shell comprises a front end face and a rear end face, the shell is provided with a rotor assembly, blades, a front bearing, a rear bearing, a stator assembly and a middle pipe, the front bearing is adjacent to the rear end face, the rear bearing is adjacent to the front end face, and the stator assembly is arranged in the middle pipe. A ring lug is arranged at the end, close to the front end face, of the main shaft, the side face, facing the front end face, of the ring lug serves as a first side face, the side face, facing the rear end face, of the ring lug serves as a second side face, external threads are continuously arranged from the first side face to one end of the main shaft, a nut is installed, and the nut is used for limiting the main shaft. The spindle is prevented from being separated from the front bearing and the rear bearing, and using performance is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of axial flow fans, and in particular relates to an axial anti-locking fan structure. Background Art

[0002] Axial flow fans provide DC power to drive the fan blades to rotate, realizing the conversion process of DC power to mechanical energy. At present, most DC fans are composed of a rotor assembly and a stator assembly. The rotor is composed of blades, a magnetic ring, a shaft core and a rotor sleeve, while the stator contains winding coils. These winding coils receive input current and generate a rotating electromagnetic field by changing the direction of the current, thereby driving the magnetic ring to rotate and driving the blade assembly to generate airflow. Existing axial flow fans use threads to limit the rear bearing. During the process of tightening the nut and under the influence of vibration, it is easy to crush the rear bearing.

[0003] In addition, in actual use, fans are often affected by vibration stress. The shaft core at the center of the fan may be subjected to axial impact or knocking, which may cause the shaft core to axially shift in the bearing, affecting the rotation of the fan assembly. This severe vibration or impact may directly affect the bearing, causing damage to the bearing or even damage to the steel ball, which will seriously affect the normal operation of the fan, and when operating in a high vibration environment, the stator may fall off the middle tube, which will affect the normal operation of the fan. Therefore, when designing and using fans, it is necessary to consider reducing vibration stress and ensuring the normal operation of the bearing, thereby ensuring the efficient operation and long-term stability of the fan.

[0004] In summary, the existing axial flow fans have low performance. Summary of the invention

[0005] In view of this, the axial anti-locking fan structure provided by the present invention can solve the technical problem of low performance of existing axial flow fans.

[0006] An axial anti-locking fan structure is suitable for dispersing the locking force of an axial flow fan main shaft. The axial flow fan comprises a shell, the shell comprises a front end face and a rear end face, the shell is provided with a rotor assembly, blades, a front bearing, a rear bearing, a stator assembly and a middle tube, the front bearing is adjacent to the rear end face, the rear bearing is adjacent to the front end face, and an end of the main shaft adjacent to the front end face is provided with a ring ear, the side of the ring ear facing the front end face is used as a first side face, and the side of the ring ear facing the rear end face is used as a second side face, wherein,

[0007] The first side surface is continuously provided with external threads to one end of the main shaft, and a nut is installed thereon, the nut is used to limit the main shaft to prevent the main shaft from being separated from the front bearing and the rear bearing;

[0008] An assembly groove is set on the main shaft near the second side surface, and a clamping ring and a gasket are placed in the assembly groove. The side of the clamping ring away from the front end surface and the side of the rear bearing facing the front end surface are tightly fitted under the action of the gasket, which can limit the axial movement of the main shaft.

[0009] Beneficial Effects

[0010] The cooperation between the provided ring ear and the assembly groove can prevent the rear bearing from being crushed during the nut locking process, and the locking force can be effectively dispersed through the ring ear. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 It is a schematic diagram of the overall structure;

[0013] Figure 2 It is a schematic diagram of the main shaft setting ring ear;

[0014] Figure 3 is a schematic diagram of a nut;

[0015] Figure 4 is a schematic diagram of the middle tube, where

[0016] 1. Middle tube; 2. Front bearing; 3. Rear bearing; 4. Ring ear; 5. Nut; 11. First hole; 12. Second hole; 13. Third hole; 14. Fourth hole; 15. Sleeve; 16. Spring. DETAILED DESCRIPTION

[0017] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0018] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0019] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0020] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure, and only show the components related to the present disclosure rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout type may also be more complicated.

[0021] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, one skilled in the art will appreciate that aspects may be practiced without these specific details.

[0022] like Figures 1 to 4 The axial anti-locking fan structure shown is suitable for dispersing the locking force of the main shaft of the axial flow fan. The axial flow fan includes a shell, and the shell includes a front face and a rear face. The shell is provided with a rotor assembly, blades, a front bearing 2, a rear bearing 3, a stator assembly and a middle tube 1. The front bearing 2 is adjacent to the rear face, and the rear bearing 3 is adjacent to the front face. The assembly relationship is: the blades are installed on the rotor assembly, and the rotor assembly wraps the stator assembly. One end of the middle tube 1 is fixedly connected to the front face, and the other end is used to support and assemble the stator assembly. Both ends of the main shaft are not in contact with the shell, and the end of the main shaft facing the rear face is installed with fan blades. Improvements are made based on the shortcomings of the axial flow fan in the prior art, such as limiting the rear bearing 3 by a nut 5. Generally, under strong vibration conditions, the rotation of the rear bearing 3 will be restricted by the nut 5, and even the rear bearing 3 may be locked. The improvements of the present invention are as follows:

[0023] See also Figure 2As shown, an end of the spindle adjacent to the front end face is provided with an annular ear 4, the side of the annular ear 4 facing the front end face is taken as the first side face, and the side of the annular ear 4 facing the rear end face is taken as the second side face, wherein the first side face is continuously provided with external threads to one end of the spindle, and a nut 5 is installed, and the nut 5 is used to limit the spindle to prevent the spindle from being separated from the front bearing 2 and the rear bearing 3. An assembly groove is provided on the spindle adjacent to the second side face, and a clamping ring and a gasket are placed in the assembly groove, and the side of the clamping ring away from the front end face and the side of the rear bearing 3 facing the front end face are tightly fitted under the action of the gasket, which can limit the axial movement of the spindle. The improved solution is a double insurance measure. Generally, the rear bearing 3 is limited by the ring ear 4. When the gasket is shattered due to strong vibration, the nut 5 is used to limit the position to ensure that the main shaft and the bearing will not be separated. Preferably, the size of the ring ear 4 corresponds to the size of the nut 5 to prevent the device of the rear bearing 3 from being crushed during the locking process of the nut 5, and the locking force can be effectively dispersed by the ring ear 4. The radial size of the nut 5 can also be larger than the radial size of the ring ear 4.

[0024] For further information, see Figure 3 As shown, fastening grooves are symmetrically arranged on the side of the nut 5 facing the front end cover, and an external tool can install the nut 5 on the main shaft through the fastening grooves.

[0025] As a specific implementation method provided in this case, in the traditional solution, the front bearing 2 is facing the rear end surface side, that is, a spring is set on the right side. The elastic force of the spring is affected by the size diameter and can only be set in a conical spring structure. The output elastic force of the conical spring is small and cannot provide sufficient elastic force to address the movement of the front bearing 2. The improvements of the present invention are as follows:

[0026] See also Figure 4 As shown, one end of the middle tube 1 is installed on the front end surface, and the other end is installed with the stator assembly. The middle tube 1 is sequentially provided with a first hole 11, a second hole 12, a third hole 13 and a fourth hole 14 that are connected in the direction from the front end cover to the rear end cover. The size of the first hole 11 is the same as that of the fourth hole 14, and is larger than that of the third hole 13. The size of the third hole 13 is larger than that of the second hole 12. The size of the second hole 12 is adapted to the size of the main shaft. Among them, the first hole 11 is connected to the outer ring of the rear bearing 3, and the fourth hole 14 is connected to the outer ring of the front bearing 2. The step surface formed by the size difference between the first hole 11 and the second hole 12 ensures the coaxiality and verticality of the matching surface between the rear bearing 3 and the middle tube 1. The step surface formed by the size difference between the third hole 13 and the fourth hole 14 ensures the coaxiality and verticality of the matching surface between the front bearing 2 and the middle tube 1, effectively ensures that the axial clearance is within a controllable range, reduces vibration and noise, ensures the smooth operation of the fan, and improves the stability and reliability of the entire system.

[0027] Furthermore, a sleeve 15 is installed on the inner ring surface of the fourth hole 14, and a spring 16 of a cylindrical structure is installed in the sleeve 15. The radial size of the spring 16 is compatible with the radial size of the third hole 13. One end of the sleeve 15 is abutted on the step surface formed by the third hole 13 and the fourth hole 14, and the other end contacts the side of the outer ring of the front bearing 2. One end of the spring 16 is abutted on the step surface formed by the third hole 13 and the second hole 12, and the other end contacts the side of the front bearing 2 facing the front end cover and on the side of the outer ring of the front bearing 2. The cylindrical spring 16 can provide a large stopping force to limit the front bearing 2, and the front bearing 2 is limited by the spring 16 sleeve to ensure that the rotating shaft has a certain axial clearance to achieve smooth operation of the rotating shaft.

[0028] Furthermore, the front bearing 2 is matched with the middle tube 1 in a clearance manner, and the rear bearing 3 is matched with the middle tube 1 in a transition manner. The front bearing 2 adopts a clearance fit, and there is a certain gap between the bearing and the sleeve, so that there is a certain sliding and buffering effect during rotation, which is conducive to reducing friction and wear. At the same time, it can also absorb axial and radial vibrations and impact forces, and improve the stability of the entire system. The rear bearing 3 adopts a transition fit, which means that the fit between the bearing and the sleeve is tighter than the front bearing 2. This can improve the support and positioning of the bearing on the shaft, further reduce axial and radial vibrations, and ensure that the fan does not shake or loosen when rotating at high speed. The bearing runs stably and is not easily damaged, thereby ensuring the stability and safety of the fan operation.

[0029] Furthermore, the gasket of the front bearing 2 is made of high-strength and high-hardness stainless steel material, which provides better protection and support because the rotor sleeve material is relatively soft and brittle or other reasons affect the normal operation of the bearing. When the fan rotor sleeve material is relatively soft and brittle, these fallen materials may enter the gap between the bearings, causing unnecessary friction and wear on the bearings, and may even damage the bearings, affecting the normal operation of the entire fan. The front bearing 2 gasket made of high-strength and high-hardness stainless steel can increase its wear resistance and corrosion resistance, extend the service life of the bearing, and improve the reliability and stability of the fan.

[0030] Preferably, the front bearing is a bearing with a dust cover, and one end of the spring is pressed against the dust cover, so that the axial force on the rotor assembly is more uniform, reducing the influence of vibration on the rotor assembly, and the vibration force can be offset by the spring.

[0031] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An axial anti-locking fan structure, suitable for dispersing the locking force of the main shaft of an axial flow fan, the axial flow fan comprises a housing, the housing comprises a front end face and a rear end face, the housing is provided with a rotor assembly, blades, a front bearing, a rear bearing, a stator assembly and a middle pipe, the front bearing is adjacent to the rear end face, the rear bearing is adjacent to the front end face, and is characterized in that: An end of the main shaft adjacent to the front end face is provided with an annular ear, the side of the annular ear facing the front end face is taken as the first side face, and the side of the annular ear facing the rear end face is taken as the second side face, wherein: The first side surface is continuously provided with external threads to one end of the main shaft, and a nut is installed thereon, the nut is used to limit the main shaft to prevent the main shaft from being separated from the front bearing and the rear bearing; An assembly groove is set on the main shaft near the second side surface, and a clamping ring and a gasket are placed in the assembly groove. The side of the clamping ring away from the front end surface and the side of the rear bearing facing the front end surface are tightly fitted under the action of the gasket, which can limit the axial movement of the main shaft.

2. The axial anti-locking fan structure according to claim 1 is characterized in that: The radial dimension of the nut is greater than the radial dimension of the ring ear, and fastening grooves are symmetrically arranged on the side of the nut facing the front end cover, and an external tool can install the nut on the main shaft through the fastening grooves.

3. The axial anti-locking fan structure according to claim 2 is characterized in that: One end of the middle tube is mounted on the front end surface, and the other end is mounted on the stator assembly. The middle tube is provided with a first hole, a second hole, a third hole and a fourth hole in sequence from the front end cover to the rear end cover. The first hole has the same size as the fourth hole and is larger than the third hole. The third hole is larger than the second hole. The second hole is matched with the spindle. The first hole is connected to the outer ring of the rear bearing, and the fourth hole is connected to the outer ring of the front bearing. The step surface formed by the size difference between the first hole and the second hole ensures the coaxiality and verticality of the mating surface between the rear bearing and the middle tube. The step surface formed by the size difference between the third hole and the fourth hole ensures the coaxiality and verticality of the mating surface between the front bearing and the middle tube, thereby ensuring the smooth operation of the fan.

4. The axial anti-locking fan structure according to claim 3 is characterized in that: A sleeve is installed on the inner ring surface of the fourth hole, and a spring of a cylindrical structure is installed in the sleeve. The radial size of the spring is matched with the radial size of the third hole. One end of the sleeve is abutted on the step surface formed by the third hole and the fourth hole, and the other end is in contact with the side of the outer ring of the front bearing. One end of the spring is abutted on the step surface formed by the third hole and the second hole, and the other end is in contact with the side of the front bearing facing the front end cover and is on the side of the outer ring of the front bearing.

5. The axial anti-locking fan structure according to claim 4 is characterized in that: The front bearing is matched with the middle tube in a clearance manner.

6. The axial anti-locking fan structure according to claim 5, characterized in that: The rear bearing is fitted to the mid-tube in an overfitting manner.

7. The axial anti-locking fan structure according to claim 6, characterized in that: The gasket of the front bearing is made of high-strength and high-hardness stainless steel material.

8. The axial anti-locking fan structure according to claim 7, characterized in that: The front bearing is a bearing with a dust cover.

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