CN111963460A

CN111963460A - Low-noise axial-flow fan

Info

Publication number: CN111963460A
Application number: CN202010806108.5A
Authority: CN
Inventors: 袁金国; 曹为洋; 袁晴川
Original assignee: Zhangjiagang Zhongxingcheng Special Equipment Co Ltd
Current assignee: Zhangjiagang Zhongxingcheng Special Equipment Co Ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2020-11-20

Abstract

The invention discloses a low-noise axial-flow fan, and particularly relates to the technical field of fans. The invention achieves the effect of reducing noise by making a noise elimination design for the protective frame, the front guide vane, the impeller and the motor bracket in the axial flow fan, meanwhile, the cylinder and the fins are all arranged into a metal net structure, heat generated in the working process of the driving motor is rapidly led out by utilizing the heat conductivity of metal, and then the contact area between the driving motor and flowing air flow is increased by utilizing the net structure, thereby greatly accelerating the heat dissipation efficiency.

Description

Low-noise axial-flow fan

Technical Field

The invention relates to the technical field of fans, in particular to a low-noise axial flow fan.

Background

The axial flow fan is also called a local fan, is a fan commonly used by industrial and mining enterprises, is different from a common fan, a motor and fan blades of the fan are arranged in a cylinder, the appearance of the fan is just a cylinder, the fan is used for local ventilation, the installation is convenient, the ventilation and air exchange effects are obvious and safe, and the fan can be connected with the cylinder to send air to a designated area. The airflow enters the axial flow fan through the current collector, is prerotated by the front guide vane, obtains energy in the impeller moving vane, is converted into static pressure energy by the rear guide vane, and finally flows through the diffusion cylinder, and is input into the pipeline after the kinetic energy of part of the axial airflow is converted into the static pressure energy.

However, the axial flow fan often generates a large noise in the operation process, and the heat generated in the working process cannot be dissipated in time to burn out the fan.

The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

In order to overcome the above-mentioned defects in the prior art, an embodiment of the present invention provides a low-noise axial flow fan, and the technical problem to be solved by the present invention is: how to reduce the noise of axial fan in the course of working and improve its radiating effect.

In order to achieve the purpose, the invention provides the following technical scheme: a low-noise axial-flow fan comprises a first barrel and a second barrel, wherein connecting flanges are fixedly sleeved on the outer peripheral surfaces of the ends, opposite to the first barrel and the second barrel, of the first barrel, the two connecting flanges are fixedly connected through bolts, a motor bracket is arranged inside one end, close to the first barrel, of the second barrel, a protective frame is arranged at the end, opposite to the second barrel, of the first barrel, a mounting plate is fixedly arranged at the center position of one end, close to the first barrel, of the motor bracket, a driving motor is fixedly mounted on one side of the mounting plate, the end portion of an output shaft of the driving motor penetrates through the mounting plate and is in transmission connection with a rotating shaft, an impeller is detachably connected to one end, away from the driving motor, of the rotating shaft, and a front guide vane is welded;

the protective frame comprises a circular ring and a circular plate which is concentrically arranged with the circular ring, wherein one side of the circular ring is annularly provided with a plurality of screw holes in a penetrating manner, the circular ring is fixedly connected with the end faces of the first barrel and the second barrel at corresponding positions through bolts, a plurality of straight strip plates which are annularly arranged and a plurality of annular plates which are equidistantly and concentrically arranged are fixedly arranged between the inner circumferential surface of the circular ring and the outer circumferential surface of the circular plate, the annular plates are welded with the straight strip plates at corresponding positions, the inner side of the circular plate at the end part of the first barrel is fixedly connected with a current collector core barrel, and the inner side of the circular plate at the end part of the second barrel is fixedly connected with a diffuser core barrel;

the protection frame, the front guide vane, the impeller and the motor bracket are all designed to eliminate noise.

The implementation mode is as follows: when the axial flow fan is used, the axial flow fan is firstly installed at a designated position, when the axial flow fan is used, the axial flow fan is communicated with an external power supply, the driving motor is controlled to work by an external controller, then the impeller is driven to rotate by the rotating shaft, the air flow in the external environment is driven to pass through the protective frame and enter the axial flow fan, the air flow is prerotated by the front guide vane and the current collector core barrel in a matching way, energy is obtained in the high-speed rotation of the impeller, the partial deflected air flow kinetic energy is converted into static pressure energy by the fins of the circular arc plate type structure, finally the air flows through the diffuser core body, and the partial axial air flow kinetic energy is converted into the static pressure energy and then is input into a pipeline to realize ventilation .

In a preferred embodiment, the number of the front guide vanes is provided with a plurality of front guide vanes, and the front guide vanes are uniformly distributed in an annular shape, so that the air flow entering the axial flow fan can be pre-rotated.

In a preferred embodiment, the motor bracket includes a cylinder, a plurality of fins are uniformly distributed on the outer circumferential surface of the cylinder in an annular shape, the number of the fins, the front guide vane and the blades of the impeller are prime numbers, and the fins, the front guide vane and the blades of the impeller are all arranged in an arc plate type structure, so that large synchronous vibration generated when the air flow passes through can be avoided, and noise is generated.

In a preferred embodiment, the cylinder and the fins are both provided with a metal mesh structure, heat generated in the operation process of the driving motor can be rapidly conducted out by utilizing the heat conductivity of metal, and then the contact area between the cylinder and the air flow passing through the cylinder is increased by utilizing the mesh structure, so that the heat dissipation efficiency of the cylinder is greatly improved.

In a preferred embodiment, the outer peripheral surfaces of the flow collector core cylinder and the diffuser core cylinder are both flared outwards from the circular plate, and one ends of the flow collector core cylinder and the diffuser core cylinder, which are far away from the circular plate, are movably attached to the end part of the impeller and the end part of the cylinder at the corresponding positions respectively, so as to guide the flowing air flow to perform the conversion from kinetic energy to static pressure energy.

In a preferred embodiment, the end surface of the current collector core barrel facing the impeller is arranged to be in a concave structure, the end surface of the current collector core barrel facing the impeller is provided with a plurality of arc grooves, and the inside of each arc groove is connected with a ball in a rolling manner, so that the friction resistance of the impeller from the current collector core barrel in the rotation process can be greatly reduced, and the output energy consumption of the driving motor is reduced.

In a preferred embodiment, a plurality of lugs arranged in an annular shape are fixedly arranged at the inner edge of the end face of the first barrel, which is close to the second barrel, a guide groove is arranged at the position, which corresponds to the lug, of the inner edge of the end face of the second barrel, which is close to the first barrel, the guide groove is arranged in an arc-shaped structure, and one end, far away from the cylinder, of the fin is slidably connected inside the guide groove, so that the first barrel and the second barrel can be more conveniently connected.

In a preferred embodiment, the one end that the fin is close to the impeller sets up to V style of calligraphy structure, the one end middle part that first barrel was kept away from to the lug is equipped with the notch that is the V type setting, and the notch that sets up V type on the lug is followed the one end of V style of calligraphy structure on the guide slot lock to the fin, can realize supporting the fin on the one hand, and on the other hand can carry out accurate counterpoint to the mounting hole on two flange.

The invention has the technical effects and advantages that:

1. the blades of the fins, the front guide vane and the impeller are all arranged into circular arc plate type structures, the circular arc degrees of the front guide vane, the blades of the impeller and the fins are gradually reduced, and larger noise caused by overlarge change amplitude of the rotating airflow is avoided;

2. according to the invention, the cylinders and the fins are both arranged into the metal mesh structure, heat generated in the working process of the driving motor is rapidly led out by utilizing the heat conductivity of metal, and then the contact area between the driving motor and air flow flowing through the driving motor is increased by utilizing the mesh structure, so that the heat dissipation efficiency is greatly improved;

3. according to the invention, the locking between the connecting flanges on the first barrel and the second barrel is firstly released, so that the abutting state of the protruding block on the fin is released, the motor bracket can slide out along the guide groove, the operation is convenient and rapid, after the replacement is completed, one end of the V-shaped structure on the fin is just opposite to the flowing direction of the air flow, the resistance of the air flow when the air flow flows through the fin can be greatly reduced, and then the notch arranged in the V shape on the protruding block is buckled to one end of the V-shaped structure on the fin along the guide groove, so that the abutting of the fin can be realized on one hand, and on the other hand, the mounting holes on the two connecting flanges can be accurately aligned.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

FIG. 2 is an enlarged view of portion A of FIG. 1 according to the present invention.

Fig. 3 is a side view of the protective frame of the present invention.

Fig. 4 is an enlarged view of the portion C of fig. 1 according to the present invention.

Fig. 5 is an enlarged view of portion B of fig. 1 according to the present invention.

Fig. 6 is a schematic view of a bump structure according to the present invention.

Fig. 7 is a partial cross-sectional view of a second barrel of the present invention.

Fig. 8 is a schematic structural diagram of the motor bracket of the present invention.

The reference signs are: 1, a first cylinder, 2, a second cylinder, 3 motor brackets, 31 cylinders, 32 fins, 4 driving motors, 5 mounting plates, 6 impellers, 7 protective frames, 71 circular rings, 72 straight strip plates, 73 circular plates, 74 circular plates, 75 screw holes, 8 front guide vanes, 9 current collector core cylinders, 10 diffuser core cylinders, 11 circular arc grooves, 12 balls, 13 bumps, 14 guide grooves, 15 connecting flanges and 16 notches.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more example embodiments. In the following description, numerous specific details are provided to give a thorough understanding of example embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, steps, and so forth. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.

The invention provides a low-noise axial flow fan, which comprises a first barrel 1 and a second barrel 2, the peripheral surfaces of the ends of the first cylinder body 1 opposite to the second cylinder body 2 are fixedly sleeved with connecting flanges 15, and the two connecting flanges 15 are fixedly connected through bolts, a motor bracket 3 is arranged inside one end of the second cylinder 2 close to the first cylinder 1, a protective frame 7 is arranged at one end of the first cylinder 1 opposite to the second cylinder 2, a mounting plate 5 is fixedly arranged at the center of one end of the motor bracket 3 close to the first cylinder 1, a driving motor 4 is fixedly arranged on one side of the mounting plate 5, the end part of an output shaft of the driving motor 4 penetrates through the mounting plate 5, the rotating shaft is connected in a transmission manner, one end of the rotating shaft, which is far away from the driving motor 4, is detachably connected with an impeller 6, and the inner circumferential surface of one end of the first cylinder 1, which is far away from the impeller 6, is welded with a front guide vane 8;

the protective frame 7 comprises a circular ring 71 and a circular plate 74 concentrically arranged with the circular ring 71, wherein one side of the circular ring 71 is annularly provided with a plurality of screw holes 75 in a penetrating manner, the circular ring 71 is fixedly connected with the end faces of the first cylinder 1 and the second cylinder 2 at corresponding positions through bolts, a plurality of straight strip plates 72 annularly arranged and a plurality of annular plates 73 equidistantly and concentrically arranged are fixedly arranged between the inner circumferential surface of the circular ring 71 and the outer circumferential surface of the circular plate 74, the annular plates 73 are welded with the straight strip plates 72 at corresponding positions, the inner side of the circular plate 74 at the end part of the first cylinder 1 is fixedly connected with a current collector core barrel 9, and the inner side of the circular plate 74 at the end part of the second cylinder 2 is fixedly connected with a diffuser core barrel 10;

the protective frame 7, the front guide vane 8, the impeller 6 and the motor bracket 3 are all designed to eliminate noise.

The quantity of preceding stator 8 is provided with a plurality ofly, and a plurality of preceding stator 8 are annular evenly distributed.

The motor bracket 3 comprises a cylinder 31, a plurality of fins 32 are uniformly distributed on the outer peripheral surface of the cylinder 31 in an annular shape, the number of the fins 32, the front guide vane 8 and the impeller 6 is prime, and the fins 32, the front guide vane 8 and the impeller 6 are all arranged in an arc plate type structure.

The cylinder 31 and the fins 32 are each provided as a metal mesh structure.

The outer peripheral surfaces of the current collector core barrel 9 and the diffuser core barrel 10 are both flared outwards from the circular plate 74, and one ends of the current collector core barrel 9 and the diffuser core barrel 10 far away from the circular plate 74 are respectively movably attached to the end part of the impeller 6 and the end part of the cylinder 31 at the corresponding positions.

The end face, facing the impeller 6, of the current collector core cylinder 9 is of a concave structure, a plurality of arc grooves 11 are formed in the end face, facing the impeller 6, of the current collector core cylinder 9, and balls 12 are connected to the inside of the arc grooves 11 in a rolling mode.

As shown in fig. 1 to 4 and fig. 6 to 8, the embodiment specifically is: in the practical use process, the axial flow fan is firstly installed at a designated position, when in use, the axial flow fan is communicated with an external power supply, the driving motor 4 is controlled to work by an external controller, then the impeller 6 is driven to rotate by the rotating shaft, the airflow in the external environment is driven to pass through the protective frame 7 to enter the axial flow fan, the airflow is pre-rotated by the front guide vane 8 and the current collector core barrel 9, energy is obtained in the high-speed rotation of the impeller 6, and then the airflow passes through the fins 32 with the arc plate type structure to convert part of the deflected airflow kinetic energy into static pressure energy, finally the air flows through the diffuser core body 10, the kinetic energy of part of the axial airflow is converted into the static pressure energy and then is input into a pipeline to realize ventilation, and because the number of the fins 32, the front guide vanes 8 and the number of the blades of the impeller 6 are mutually prime numbers, the, the blades of the fins 32, the front guide vanes 8 and the impeller 6 are all arranged in an arc plate type structure (the arc degrees of the blades of the fins 32, the front guide vanes 8 and the impeller 6 can be adjusted according to actual conditions), the arc degrees of the blades of the front guide vanes 8 and the impeller 6 and the blades of the fins 32 are gradually reduced, large noise caused by overlarge change range of rotating airflow is avoided, and the guard frame 7, the front guide vanes 8, the impeller 6 and the motor bracket 3 in the axial flow fan are subjected to noise elimination design (ultra-fine glass wool and a perforated plate are used for noise elimination treatment) so as to achieve the effect of further reducing the noise;

furthermore, a plurality of straight strip plates 72 arranged in a ring shape and a plurality of annular plates 73 arranged in a concentric manner at equal intervals are fixedly arranged between the inner circumferential surface of a ring 71 on the protection frame 7 and the outer circumferential surface of a circular plate 74, the annular plates 73 and the straight strip plates 72 at corresponding positions are welded to form an isolation net plate for protecting two ends of the axial flow fan, thereby avoiding abnormal operation of the fan caused by the fact that light drifts in the outer environment enter the fan to be wound, meanwhile, because the driving motor 4 can generate a large amount of heat in the operation process, both the cylinder 31 and the fins 32 are arranged into a metal net structure, the heat generated in the operation process of the driving motor 4 is rapidly led out by utilizing the heat conductivity of metal, then the contact area between the driving motor and the flowing air flow is increased by utilizing the net structure, thereby greatly accelerating the heat dissipation efficiency of the axial flow fan, and the embodiment specifically solves the problems that the, Poor heat dissipation effect.

The fixed lug 13 that is a plurality of annular settings that are that is equipped with in the edge department in the terminal surface that the first barrel 1 of low noise axial-flow fan of this embodiment is close to second barrel 2, second barrel 2 is close to the position department that the terminal surface inward flange of first barrel 1 corresponds lug 13 and is provided with guide slot 14, guide slot 14 sets up to the arc structure, and the one end sliding connection that drum 31 was kept away from to fin 32 is inside guide slot 14.

One end of the fin 32 close to the impeller 6 is arranged to be in a V-shaped structure, and a notch 16 which is arranged in a V shape is formed in the middle of one end, far away from the first barrel 1, of the convex block 13.

As shown in fig. 1 and fig. 5 to 8, the embodiment specifically is: in the actual use process, when the impeller 6 or the motor bracket 3 inside the axial flow fan needs to be replaced, the locking between the connecting flanges 15 on the first cylinder 1 and the second cylinder 2 can be firstly released, then the lug 13 on the first cylinder 1 is drawn out from the guide groove 14 on the second cylinder 2 at the corresponding position, so that the abutting state of the lug 13 on the fin 32 is released, then the motor bracket 3 can slide out along the guide groove 14, the operation is convenient and quick, after the replacement is completed, one end of the V-shaped structure on the fin 32 is opposite to the flowing direction of the airflow, the resistance of the airflow flowing through the fin 32 can be greatly reduced, then the notch 16 arranged in the V shape on the lug 13 is buckled to one end of the V-shaped structure on the fin 32 along the guide groove 14, on one hand, the abutting of the fin 32 can be realized, on the other hand, the accurate alignment can be carried out on the mounting holes on the two connecting flanges 15, the installation efficiency is improved, and the problem that the motor bracket 3 is not convenient to replace and the mounting holes are prone to being misaligned in the scheme is solved.

The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;

secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;

and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.

Claims

1. The utility model provides a low noise axial-flow fan, includes first barrel (1) and second barrel (2), first barrel (1) is equipped with flange (15) with the equal fixed cover in one end outer peripheral face that second barrel (2) is relative, and passes through bolt fixed connection, its characterized in that between two flange (15): a motor bracket (3) is arranged inside one end, close to the first barrel (1), of the second barrel (2), a protection frame (7) is arranged at one end, opposite to the second barrel (2), of the first barrel (1), a mounting plate (5) is fixedly arranged at the center position of one end, close to the first barrel (1), of the motor bracket (3), a driving motor (4) is fixedly mounted on one side of the mounting plate (5), the end part of an output shaft of the driving motor (4) penetrates through the mounting plate (5) and is in transmission connection with a rotating shaft, an impeller (6) is detachably connected to one end, far away from the driving motor (4), of the rotating shaft, and a front guide vane (8) is welded on the inner circumferential surface of one end, far away from the impeller (6), of;

the protective frame (7) comprises a circular ring (71) and a circular plate (74) concentrically arranged with the circular ring (71), one side of the circular ring (71) is annularly provided with a plurality of screw holes (75) in a penetrating manner, the circular ring (71) is fixedly connected with the end faces of the first barrel (1) and the second barrel (2) at corresponding positions through bolts, a plurality of annularly arranged straight strip plates (72) and a plurality of equidistant and concentrically arranged annular plates (73) are fixedly arranged between the inner circumferential surface of the circular ring (71) and the outer circumferential surface of the circular plate (74), the annular plates (73) are welded with the straight strip plates (72) at corresponding positions, the inner side of the circular plate (74) at the end part of the first barrel (1) is fixedly connected with a current collector core barrel (9), and the inner side of the circular plate (74) at the end part of the second barrel (2) is fixedly connected with a diffuser core barrel (10);

the protection frame (7), the front guide vane (8), the impeller (6) and the motor bracket (3) are all designed to eliminate noise.

2. A low noise axial flow fan according to claim 1, wherein: the quantity of preceding stator (8) is provided with a plurality ofly, and a plurality of preceding stator (8) are annular evenly distributed.

3. A low noise axial flow fan according to claim 2, wherein: motor bracket (3) are including drum (31), the periphery of drum (31) is personally submitted annular evenly distributed and is had a plurality of fins (32), the blade quantity of fin (32), preceding stator (8) and impeller (6) each other is prime number, and the blade of fin (32), preceding stator (8) and impeller (6) all sets up to circular arc plate structure.

4. A low noise axial flow fan according to claim 3, wherein: the cylinder (31) and the fins (32) are both arranged to be of a metal mesh structure.

5. A low noise axial flow fan according to claim 3, wherein: the outer peripheral surfaces of the current collector core barrel (9) and the diffuser core barrel (10) are arranged from the circular plate (74) to the outside in a flaring shape, and one ends, far away from the circular plate (74), of the current collector core barrel (9) and the diffuser core barrel (10) are movably attached to the end part of the impeller (6) and the end part of the cylinder (31) in the corresponding positions respectively.

6. A low noise axial flow fan according to claim 1, wherein: the end face, facing the impeller (6), of the current collector core cylinder (9) is of a concave structure, a plurality of arc grooves (11) are formed in the end face, facing the impeller (6), of the current collector core cylinder (9), and balls (12) are connected to the inner portions of the arc grooves (11) in a rolling mode.

7. A low noise axial flow fan according to claim 3, wherein: the fixed lug (13) that are the annular setting that are equipped with of terminal surface inner edge department that first barrel (1) is close to second barrel (2), the position department that the terminal surface inward flange that second barrel (2) is close to first barrel (1) corresponds lug (13) is provided with guide slot (14), guide slot (14) set up to the arc structure, and fin (32) keep away from the one end sliding connection of drum (31) inside guide slot (14).

8. A low noise axial flow fan according to claim 7, wherein: one end of the fin (32) close to the impeller (6) is arranged to be of a V-shaped structure, and a notch (16) arranged in a V shape is formed in the middle of one end, far away from the first barrel (1), of the convex block (13).