WO2021082177A1

WO2021082177A1 - Axial flow fan having two fixed bearings

Info

Publication number: WO2021082177A1
Application number: PCT/CN2019/123217
Authority: WO
Inventors: 朱云舫
Original assignee: 苏州工业园区星德胜电机有限公司
Priority date: 2019-11-01
Filing date: 2019-12-05
Publication date: 2021-05-06

Abstract

An axial flow fan having two fixed bearings, comprising: a motor having a rotating shaft (3) for outputting rotational power, the motor comprising a stator (17) and a rotor (4); fan blades (7) mounted at an end of the rotating shaft (3); fixed bearings comprising a head end bearing (1) and a tail end bearing (2) respectively disposed at two shaft ends of the rotor (4), wherein the head end bearing (1) and the tail end bearing (2) are fixed to the rotating shaft (3) in a coaxial manner; and a housing surrounding the motor, wherein the head end bearing (1) and the tail end bearing (2) are respectively surrounded by a head surround ring (13) and a tail surround ring (11), the head surround ring (13) and the tail surround ring (11) are fixed to the housing by means of a deflector (14) and a connection rib (8) respectively, a hollow portion (12) is formed between adjacent connection ribs (8), and the housing defines a through air channel parallel to the axial direction of the rotating shaft (3). The rotating shaft of the motor is limited by the two bearings which are spaced relatively far apart from each other and firmly fixed, such that vibrations and shaking during operation of the axial flow fan can be controlled. Moreover, the installed bearings do not negatively affect the overall airflow resistance.

Description

A double-head fixed axial flow fan

Technical field

The invention relates to the field of fan motors, in particular to a double-head fixed axial flow fan.

Background technique

At present, the hair dryers on the market have a single pick structure, that is, the rotating shaft connecting the fan blades is similar to a one-way cantilever structure. The length of this cantilever structure is determined by the inherent design, and the overall vibration of the fan blade is large during the transmission process. The noise generated will reduce the experience and also reduce the service life.

Summary of the invention

The problem to be solved by the present invention is to provide a double-head fixed axial flow fan. The motor shaft is limited by two relatively far apart bearings, and both bearings are firmly fixed, so the vibration of the axial flow fan can be controlled during operation. Jitter, and the set bearing has little effect on the overall wind resistance.

In order to solve the above problems, the present invention provides a double-head fixed axial flow fan. In order to achieve the above objectives, the technical solutions adopted by the present invention to solve the technical problems are as follows:

A double-head fixed axial flow fan includes: a motor body with a rotating shaft that outputs rotational power; the motor body includes a stator and a rotor; fan blades are assembled with one end of the rotating shaft; The end bearing, the tail end bearing, the head end bearing, the tail end bearing and the shaft are coaxially fixed; the casing is wrapped on the outside of the motor body, the head end bearing and the tail end bearing are respectively wrapped by the first wrapping ring and the tail wrapping ring, and the first wrapping ring , The tail wrapping ring is fixed to the casing by the guide vanes and the connecting ribs respectively, the hollow part is formed between the adjacent connecting ribs, and the casing forms a through air duct parallel to the axis of the rotating shaft.

The beneficial effect of adopting the above technical solution is that the head and tail ends of the rotating shaft are fixed by bearings, that is, the shaft ends on both sides of the corresponding rotor are equipped with rotating shafts. If the rotating shaft as the power output source is unstable during its rotation, it will inevitably vibrate. This application document fixes the rotating shaft at both places, which greatly improves the rotation of the rotating shaft without affecting the rotation of the rotating shaft. The stability. Since the two bearings are located at both ends of the rotor and are relatively far apart, the limit effect is good.

Both the head end bearing and the tail end bearing are limited by independent components, which can obtain strong spatial stability. Aiming at the space fixed position of the tail end bearing, the tail end bearing is fixedly connected to the casing through a tail wrapping ring and a connecting rib in turn. The connecting rib itself has a small axial projection area, and can relatively form a large-area hollow part, which has minimal interference to the airflow of the entire ventilating duct. The entire axial flow fan has high efficiency and excellent vibration and noise.

As a further improvement of the present invention, the casing includes a first casing and a tail casing that are butted with each other. The inner wall of the first casing is integrally fixed with the first wrapping ring through a deflector, and the inner wall of the tail casing is integrated with the tail wrapping ring through a connecting rib. fixed.

The beneficial effect of adopting the above technical solution is that the guide vane simultaneously has the functions of diversion and radial connection. The first wrap ring and the tail wrap ring are used to accommodate the head end bearing and the tail end bearing respectively, and the head casing and the tail casing are convenient for clamping and fixing. The head end bearing and the tail end bearing are not on the same integral part, which can reduce the probability of resonance and further reduce the vibration phenomenon during rotation. The assembly method of the first casing and the rear casing is also convenient for disassembly, assembly and maintenance.

As a further improvement of the present invention, the guide vanes and the connecting ribs are arranged in a circular array around the axis of the rotating shaft; the connecting ribs include axial ribs fixed in contact with the inner wall of the tail casing, and also include an angle with the axis of the rotating shaft. The extending oblique ribs are connected with the tail wrap ring; the extending direction of the axial ribs is parallel to the direction of the axis of the rotating shaft, and each axial rib has a guide vane to butt axially.

The beneficial effect of adopting the above-mentioned technical solution is that the annular array and the radially extending connecting ribs make the tail end bearing and the tail casing fixed firmly and uniformly. The axial ribs of the connecting ribs increase the fixed area of the connecting ribs and the tail casing, and improve the stability of the connecting ribs. At the same time, the axial ribs are butt-connected with the deflector, which can play a part of the role of early drainage.

As a further improvement of the present invention, the guide vanes are arranged spirally around the axis of the rotating shaft, and the number of axial ribs is smaller than the number of guide vanes.

The beneficial effects of adopting the above technical solution are: the spirally arranged guide vanes play a role in the early diversion of the airflow, prepare for the rotation of the fan blades, improve the blowing efficiency, and the number of axial ribs is as small as possible, and the relative hollow part is as large as possible , In this way, the wind resistance of the through air duct of the casing will be smaller.

As a further improvement of the present invention, the deflector has an enlarged portion on the side facing the direction of the rotating shaft, and the number of connecting ribs is three.

The beneficial effect of adopting the above technical solution is that the enlarged part can increase the contact area with the stator, improve the mutual stability between the stator and the casing, and ensure that the axis of the casing also coincides with the axis of the rotating shaft.

As a further improvement of the present invention, the first wrap ring and the tail wrap ring are each provided with stepped holes that contact the head end bearing and the tail end bearing.

The beneficial effect of adopting the above technical solution is that the stepped hole is first a through hole, which is convenient for the shaft to pass through. At the same time, the stepped hole determines that it has a mutually perpendicular annular surface and an inner circumferential surface. The annular surface and the inner circumferential surface can face the head end bearing, The end bearing serves as a good limit support to prevent axial and radial movement.

As a further improvement of the present invention, the fan blades, the head end bearing, and the tail end bearing are arranged in one direction in sequence, and the fan blades are located in the head housing.

The beneficial effect of adopting the above technical solution is that the layout of the head end bearing will not affect the air blast of the fan blade.

As a further improvement of the present invention, a stator frame is clamped between adjacent stators. The stator frame is provided with a fixing hole at the end facing away from the fan blade. The tail wrapping ring is provided with a non-contact fixing disc at the end facing away from the fan blade. The upper part is assembled with fixing rods in an annular array with fixing holes, the length direction of the fixing rods is parallel to the axial direction of the rotating shaft, and the fixing plate is provided with a wire on the side facing away from the tail wrapping ring.

The beneficial effect of adopting the above technical solution is that the stator plays a role of excitation, and the stator frame plays a role of limiting and insulating the stator. The wire is not directly fixed to the tail wrapping ring at the end, but is fixed to the stator frame by the fixing plate and fixing rod. Because the long wire has a relatively heavy weight, if it is directly fixed to the tail wrapping ring, the different angle of the wire itself will be affected. The drag force generated in different directions on the tail wrap ring will cause slight deformation of the tail wrap ring. In this way, the head end bearing and the tail end bearing may no longer be on the same spatial axis, which may increase the noise and jitter when the rotating shaft rotates. The fixing method of the wire directly to the stator bracket avoids this phenomenon.

As a further improvement of the present invention, the wire is electrically connected to the motor body through the fixed rod and the stator frame in sequence.

The beneficial effect of adopting the above technical solution is that the fixed rod can be used for one thing and two purposes, and at the same time, it can also be used as a medium for electrical connection.

As a further improvement of the present invention, the head end bearing and the tail end bearing are radial ball bearings.

The beneficial effect of adopting the above technical solution is that the radial ball bearing mainly bears the vibration of the rotating shaft in the radial direction, and the rolling friction resistance of the rotating shaft is very small when the rotating shaft is self-transmitting.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Fig. 1 is a front view of an embodiment of the present invention.

Fig. 2 is an A-A cross-sectional view of an embodiment of the present invention.

Fig. 3 is a perspective view of an embodiment of the present invention.

Fig. 4 is a perspective view of an embodiment of the present invention.

Fig. 5 is a perspective view of an embodiment of the present invention.

Fig. 6 is a perspective view of an embodiment of the present invention.

Fig. 7 is a perspective view of an embodiment of the present invention.

Fig. 8 is a perspective view of an embodiment of the present invention.

Fig. 9 is a perspective view of an embodiment of the present invention.

Figure 10 is an axial view of an embodiment of the present invention.

Fig. 11 is a perspective view of an embodiment of the present invention.

Fig. 12 is a schematic diagram of another embodiment of the present invention.

1- head end bearing; 2- tail end bearing; 3- shaft; 4- rotor; 5- head casing; 6-tail casing; 7- fan blade; 8- connecting rib; 9- diagonal rib; 10- Axial ribs; 11-tail wrapping ring; 12-hollowed part; 13-first wrapping ring; 14- deflector; 15-expanded part; 16-stator frame; 17-stator; 18-fixing hole; 19-wire; 20-fixed plate; 21-fixed rod; 22-balance ring.

Detailed ways

The content of the present invention will be further described in detail below in conjunction with specific embodiments:

In order to achieve the purpose of the present invention, a double-head fixed axial flow fan includes: a motor body with a rotating shaft 3 that outputs rotational power; the motor body includes a stator 17 and a rotor 4; a fan blade 7 assembled with one end of the rotating shaft 3; The fixed bearing includes a head end bearing 1 and a tail end bearing 2 respectively arranged at the two shaft ends of the rotor 4. The head end bearing 1, the tail end bearing 2 and the shaft 3 are coaxially fixed; the casing is wrapped on the outside of the motor body, and the head end bearing 1. The end bearing 2 is respectively wrapped by the first wrapping ring 13 and the tail wrapping ring 11. The first wrapping ring 13 and the tail wrapping ring 11 are fixed to the casing by the deflector 14 and the connecting rib 8 respectively, and between the adjacent connecting ribs 8. The hollow part 12 is formed, and the casing forms a through air passage parallel to the axial direction of the rotating shaft 3.

In other embodiments of the present invention, the casing includes a first casing 5 and a tail casing 6 that are butted with each other. The inner wall of the first casing 5 is integrally fixed with the first wrapping ring 13 through the deflector 14 and the rear casing 6 The inner wall is integrally fixed with the tail wrapping ring 11 through the connecting rib 8.

At the same time, the radial widths of the first housing 5 and the tail housing 6 are equal, and the butting assembly methods of the first housing 5 and the tail housing 6 can be clamping, bonding, screw fixing, and the like.

The outer diameters of the first housing 5 and the tail housing 6 in Fig. 1 are both 27 mm, but the outer diameters of the first housing 5 and the tail housing 6 are not limited and are determined according to actual needs.

In other embodiments of the present invention, the deflector 14 and the connecting ribs 8 are arranged in an annular array around the axis of the rotating shaft 3; the connecting ribs 8 include axial ribs 10 fixed in contact with the inner wall of the tail casing 6, and further include The oblique ribs 9 extending at an angle to the axis of the shaft 3 are connected to the tail wrap ring 11; the extending direction of the axial ribs 10 is parallel to the direction of the axis of the shaft 3, and each axial rib 10 exists A guide vane 14 is axially butted with it.

Along a spatial plane parallel to the axis of the rotating shaft 3 and perpendicular to the oblique rib 9, the cross-sectional profile formed on the oblique rib 9 is streamlined.

A balance ring 22 is provided between the rotor 4 and the head end bearing 1, and between the rotor 4 and the tail end bearing 2, and the balance ring 22 is in contact with the two shaft ends of the rotor 4. The balance ring 22 plays a role in ensuring the balance of the rotor 4.

In other embodiments of the present invention, the guide vane 14 is spirally arranged around the axis of the rotating shaft 3, and the number of the axial ribs 10 is smaller than the number of the guide vane 14. As shown in FIG.

In other embodiments of the present invention, the deflector 14 is provided with an enlarged portion 15 on the side facing the direction of the rotating shaft 3, and the number of connecting ribs 8 is preferably three. In fact, the number of connecting ribs 8 is not limited, and is based on actual production needs. To set up, as long as it does not affect the ventilation of the through ventilation duct.

In other embodiments of the present invention, the first wrapping ring 13 and the tail wrapping ring 11 are each provided with a stepped hole contacting the head end bearing 1 and the tail end bearing 2.

In other embodiments of the present invention, the fan blade 7, the head end bearing 1, and the tail end bearing 2 are arranged in one direction in sequence, and the fan blade 7 is located in the head housing 5.

In other embodiments of the present invention, a stator frame 16 is clamped between adjacent stators 17. The stator frame 16 is provided with a fixing hole 18 at the end away from the fan blade 7, and the tail wrapping ring 11 is provided at the end away from the fan blade 7. There is a non-contact fixed disk 20. The fixed disk 20 is assembled with fixed holes 18 through a ring-shaped array of fixed rods 21. The length of the fixed rod 21 is parallel to the axis of the rotating shaft 3 itself. The fixed disk 20 is set on the side facing away from the tail wrapping ring 11. There is a wire 19.

In other embodiments of the present invention, the wire 19 is electrically connected to the motor body through the fixed rod 21 and the stator frame 16 in sequence.

In other embodiments of the present invention, the head end bearing 1 and the tail end bearing 2 are radial ball bearings.

Among them, in order to facilitate the presentation of the internal structure. Figure 5 hides the tail housing 6. Figure 6 hides the first housing 5. Figure 7 hides the first housing 5 and the tail housing 6. Figure 8 hides the first housing 5, the tail housing 6, the fan blades 7, and the stator frame 16. Figures 9 and 10 hide the first housing 5, the tail housing 6, the fan blades 7, and the rotor 4. FIG. 11 hides part of the first casing 5, the tail casing 6, the fan blades 7, a part of the stator frame 16, and a part of the stator rotor 4.

In the present invention, unless otherwise clearly defined and limited, the terms "installation", "setting", "connection", "fixing", "spinning" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. It can be detachably connected or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction between two components Unless specifically defined otherwise, those of ordinary skill in the art can understand the specific meaning of the above-mentioned terms in the present invention according to specific circumstances. The above-mentioned embodiments are only to illustrate the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it, and should not limit the protection scope of the present invention. The present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements. All equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

A double-head fixed axial flow fan, which is characterized in that it comprises:

A motor body having a rotating shaft for outputting rotational power, the motor body including a stator and a rotor;

The fan blade is assembled with one end of the rotating shaft;

The fixed bearing includes a head end bearing and a tail end bearing respectively arranged at the two shaft ends of the rotor, wherein the head end bearing and the tail end bearing are coaxially fixed with the rotating shaft;

The casing is wrapped on the outside of the motor body. The head end bearing and the tail end bearing are respectively wrapped by a head wrap ring and a tail wrap ring. The head wrap ring and the tail wrap ring are respectively fixed to the casing by a deflector and a connecting rib. , A hollow part is formed between adjacent connecting ribs, and the casing forms a through air passage parallel to the axial direction of the rotating shaft.
The double-head fixed axial flow fan according to claim 1, wherein the casing includes a first casing and a rear casing that are connected to each other, and the inner wall of the first casing passes through a guide vane and a first wrapping ring. Integral fixing, the inner wall of the tail casing is integrally fixed with the tail wrapping ring through the connecting ribs.
The double-head fixed axial flow fan according to claim 2, wherein the guide vanes and the connecting ribs are arranged in a circular array around the axis of the rotating shaft; the connecting ribs include contact and fixation with the inner wall of the tail casing The axial ribs further include oblique ribs extending at an angle with the axis of the shaft, and the oblique ribs are connected to the tail wrap ring; the extending direction of the axial ribs is parallel to the direction of the axis of the shaft, and each shaft There is a guide vane to butt against the axial direction of the ribs.
The double-head fixed axial flow fan according to claim 3, wherein the guide vanes are spirally arranged around the axis of the rotating shaft, and the number of the axial ribs is less than the number of guide vanes.
The double-head fixed axial flow fan according to claim 4, wherein the guide vane has an enlarged portion on one side facing the direction of the rotating shaft, and the number of the connecting ribs is three.
The double-head fixed axial flow fan according to claim 1, wherein the first wrap ring and the tail wrap ring are each provided with a stepped hole contacting the head end bearing and the tail end bearing.
The double-head fixed axial flow fan according to claim 2, wherein the fan blades, the head end bearing, and the tail end bearing are arranged in one direction in sequence, and the fan blades are located in the head casing.
The double-head fixed axial flow fan according to claim 1, wherein a stator frame is clamped between adjacent stators, the stator frame is provided with a fixing hole at one end away from the fan blade, and the tail wrapping ring is The end facing away from the fan blade is provided with a non-contact fixed disk. The fixed disk is assembled with fixed holes through a ring-shaped array of fixed rods. The length of the fixed rod is parallel to the axis of the rotating shaft. The fixed disk is wrapped away from the tail. A wire is provided on one side of the ring.
The double-head fixed axial flow fan according to claim 8, wherein the wire is electrically connected to the motor body through the fixed rod and the stator frame in sequence.
The double-head fixed axial flow fan according to claim 1, wherein the head end bearing and the tail end bearing are radial ball bearings.