CN112253508B

CN112253508B - Environment-friendly low-noise damping alternating-current centrifugal fan

Info

Publication number: CN112253508B
Application number: CN202011141525.9A
Authority: CN
Inventors: 雷付长
Original assignee: Dongguan Mutual Motor Technology Co ltd
Current assignee: Dongguan Mutual Motor Technology Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-04-23
Anticipated expiration: 2040-10-22
Also published as: CN112253508A

Abstract

The invention relates to an environment-friendly low-noise damping alternating-current centrifugal fan which comprises a volute 1 and an impeller 2 arranged in the volute, wherein an axial-flow air inlet and a centrifugal air outlet are formed in the volute, a middle pipe which is coaxial with the impeller is arranged on the volute, one end of the middle pipe is connected with the volute, a mandrel arranged on the inner side of the middle pipe is arranged on the impeller, one end of the mandrel is connected with the impeller, the middle part of the mandrel is hinged with the middle pipe through a sphere, and the other end of the mandrel penetrates through the middle pipe and is connected with a counterweight rotor; the middle pipe is provided with an iron core arranged outside the middle pipe, the outer side of the iron core is wound with a winding, and the impeller is provided with a rotor surrounding the periphery of the iron core; the invention utilizes the ball hinge joint to enable the mandrel to have all-directional deflection capability, can convert vibration into axial deflection of the mandrel, and then utilizes the angular momentum when the impeller and the counterweight rotor rotate to effectively buffer and inhibit the deflection, so that the pressure born by an inner part is obviously reduced, and the abrasion among all parts is reduced.

Description

Environment-friendly low-noise damping alternating-current centrifugal fan

Technical Field

The invention relates to ventilation and heat dissipation equipment for an airborne radar, in particular to an environment-friendly low-noise damping alternating-current centrifugal fan.

Background

In order to meet the requirements of air warning, reconnaissance, surveying and mapping and the like and ensure the accuracy and flight safety of air routes, the radar is widely applied to equipment of various types of airplanes, particularly military airplanes; in order to enable the airborne radar to obtain a wider scanning coverage range and a more accurate scanning result, the airborne radar has larger power during working, the equipment has large heat productivity, timely and effective heat dissipation is required, the temperature of the airborne radar is ensured to be normal, and the normal working of the radar is ensured.

Airborne radar generally adopts fan equipment to carry out the forced air cooling heat dissipation, and the forced air cooling heat dissipation needs to introduce external environment air, and the high-speed flight of aircraft and flexible in-process, and the impact vibrations to fan equipment when external air pressure gets into is very big, and frequent vibrations must lead to the fact fan equipment internals's serious wearing and tearing to damage even, leads to the fan operation to have the unstable factor, is unfavorable for radiating stability, persistence and security.

Simultaneously, because the rotational speed of impeller is very fast when the fan operation, the blade can produce great noise to the continuous high-speed cutting of air current, both can produce great influence to the surrounding environment, also does not benefit to operating personnel and judges the hearing of surrounding environment, and the sound wave vibration that the noise produced can further aggravate the vibrations of fan self.

Disclosure of Invention

In order to overcome the technical defects in the prior art, the invention provides an environment-friendly low-noise damping alternating-current centrifugal fan to solve the problems that the existing fan is high in noise and easy to wear due to vibration.

The technical scheme for solving the problem is as follows: the centrifugal pump comprises a volute and an impeller arranged in the volute, wherein an axial flow air inlet and a centrifugal air outlet are formed in the volute, the axial flow air inlet and the centrifugal air outlet are coaxially arranged with the impeller, the centrifugal air outlet is formed in the periphery of the impeller, a middle pipe is arranged on the volute and is coaxially arranged with the impeller, one end of the middle pipe is connected with the volute, a mandrel is coaxially arranged on the inner side of the middle pipe is arranged on the impeller, one end of the mandrel is connected with the impeller, the middle part of the mandrel is coaxially hinged with the middle pipe through a sphere, and; the impeller, the mandrel, the sphere, the counterweight rotor, the iron core, the winding and the rotor form a shockproof assembly, and the weight of the shockproof assembly is symmetrical along the spherical center of the sphere.

The mandrel and the middle pipe are hinged by the sphere, so that the mandrel has all-directional deflection capability, when the fan generates vibration, the vibration can be converted into axial deflection of the mandrel, and then the deflection is effectively buffered and inhibited by angular momentum generated when the impeller and the counterweight rotor rotate, so that the pressure borne by internal parts such as the middle pipe is obviously reduced, the abrasion among all parts is reduced, and the stability, the safety and the service life of the fan are improved.

Drawings

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

Fig. 2 is a cross-sectional view a-a of the present invention.

Fig. 3 is a sectional view taken along line B-B of fig. 2 according to the present invention.

Fig. 4 is an isometric view of the present invention.

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

Fig. 6 is an axial cross-sectional view of the present invention.

Fig. 7 is a perspective view of the impeller of the present invention.

FIG. 8 is a schematic view of the present invention with the volute removed.

Fig. 9 is a schematic perspective view of the volute of the present invention.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 9, the present invention includes a volute 1 and an impeller 2 disposed in the volute, the volute 1 is provided with an axial flow air inlet 3 disposed coaxially with the impeller 2 and a centrifugal air outlet 4 disposed outside the circumference of the impeller 2, the volute 1 is provided with a middle pipe 5 disposed coaxially with the impeller 2, one end of the middle pipe is connected with the volute 1, the impeller 2 is provided with a core shaft 6 disposed coaxially inside the middle pipe 5, one end of the core shaft 6 is connected with the impeller 2, the middle part of the core shaft 6 is coaxially hinged with the middle pipe 5 via a sphere 7, and the other end of the core shaft 6 penetrates through the middle pipe 5 and is connected with a counterweight rotor 8; the middle pipe 5 is provided with an iron core 9 coaxially arranged on the outer side of the middle pipe 5, a winding 10 is wound on the outer side of the iron core 9, the impeller 2 is provided with a rotor 11 coaxially surrounding the periphery of the iron core 9, and the iron core 9, the winding 10 and the rotor 11 form a built-in motor for driving the impeller 2 to rotate; the impeller 2, the mandrel 6, the sphere 7, the counterweight rotor 8, the iron core 9, the winding 10 and the rotor 11 form a shockproof assembly, and the weight of the shockproof assembly is symmetrical along the spherical center of the sphere 7 in all directions (at least, the shockproof assembly is symmetrical along the spherical center of the sphere 7 in the axial direction and the radial direction).

When the anti-vibration device is used, the motor is started to drive the impeller 2 to rotate, the counterweight rotor 8 synchronously rotates, and the weight of the anti-vibration component is symmetrical along the spherical center of the sphere 7, so that the two axial ends of the mandrel 6 are kept balanced in the rotating process of the impeller 2 and the counterweight rotor 8, and the anti-vibration component stably rotates without generating precession motion; when the fan vibrates due to factors such as external environment or fan operation problems, the spindle 6 is influenced by the vibration to generate axial deflection along the center of the sphere 7, so that the axial direction of the counterweight rotor 8 is changed; because the angular momentum generated by the high-speed rotation of the counterweight rotor 8 causes the counterweight rotor to generate resistance to self axial change, the counterweight rotor 8 has the tendency of keeping the original axial direction unchanged under the action of the resistance, thereby greatly weakening the axial deflection angle of the counterweight rotor 8, simultaneously generating good buffer action on the deflection of the mandrel 6, obviously reducing the influence of vibration on the internal parts of the fan, achieving the damping effect, being beneficial to reducing the abrasion of the parts, and improving the service life and the safety performance.

Furthermore, the axial flow air inlet 3 is composed of a compression air duct 301 with an outer conical opening and a straight cylindrical throat 302, wherein the conical large end of the compression air duct 301 faces outwards, and two ends of the throat 302 are respectively communicated with the conical small end of the compression air duct 301 and the inside of the volute; the volute 1 is provided with a plurality of guide holes 12 which are uniformly distributed on the periphery of the throat 302, one end of each guide hole 12 is communicated with the throat 302, and the other end of each guide hole 12 is communicated with the outside of the volute 1; according to the relationship characteristic between the fluid pressure and the flow speed given by the knoop-berly principle, when the airflow enters the volute through the axial flow air inlet 3, the compressed air duct 301 firstly compresses the airflow to improve the airflow velocity and then enters the throat 302, the airflow velocity at the throat 302 is high, the pressure is low to generate negative pressure, so that the outside air rapidly enters the throat 302 through the diversion holes 12 under the action of pressure difference, the air inlet amount is enhanced, and the overall operation efficiency of the fan is improved.

Furthermore, the flow guide holes 12 are in the direction of a spiral curve, when the airflow enters the throat 302 through the flow guide holes 12, the airflow flows along the direction of the spiral curve, so that the airflow entering the throat 302 rotates, and the rotation direction is consistent with the rotation direction of the impeller 2, thereby effectively reducing the cutting of the blades of the impeller 2 on the airflow and reducing the noise generated by the airflow cutting.

Furthermore, a plurality of spiral grooves 13 are circumferentially distributed on the conical inner wall of the compression air duct 301, after the air flow enters the compression air duct 301, the spiral grooves 13 guide the air flow to change the air flow direction and rotate, the rotating direction is consistent with the rotating direction of the impeller 2, the cutting of the blades of the impeller 2 to the air flow can be effectively reduced, and the noise generated by the air flow cutting is reduced.

Furthermore, the volute 1 is provided with a conical air guide sleeve 14 coaxially arranged on the inner side of the compression air duct 301, the conical small end of the air guide sleeve 14 faces outwards, namely the conical direction of the air guide sleeve 14 is opposite to that of the compression air duct 301, the conical large end of the air guide sleeve 14 is arranged on the inner side of the conical small end of the compression air duct 301, and an annular air duct with a trapezoidal section is formed between the air guide sleeve 14 and the compression air duct 301, so that air flow is further compressed and accelerated when flowing through the annular air duct, the negative pressure effect at the throat 302 is improved, and the air intake is further increased.

Further, the impeller 2 is a coil impeller composed of a rim 201, a wheel disc 202 and a plurality of blades 203, and the spindle 6 and the rotor 11 are respectively arranged on the rim 201.

Furthermore, a circular moving magnet 15 which is coaxial with the counterweight rotor 8 is arranged on the counterweight rotor 8, a circular fixed magnet 16 which is coaxial with the moving magnet 15 is arranged on the volute 1, the fixed magnet 16 generates a magnetic attraction effect on the moving magnet 15, so that the moving magnet 15 always keeps a tendency of resetting towards the direction of the fixed magnet 16, when the axial direction of the mandrel 6 deflects due to vibration, the magnetic force between the fixed magnet 16 and the moving magnet 15 needs to be overcome firstly, thereby further improving the stability of the mandrel 6 and enhancing the shockproof effect of the mandrel 6; meanwhile, the magnetic force between the magnet 16 and the movable magnet 15 can ensure that the mandrel 6 keeps stable pointing when the fan is maneuvered and turned along with the using equipment, and the phenomenon that the mandrel 6 shakes to influence the operation of the fan is avoided.

Furthermore, the volute casing 1 is provided with heat dissipation fins 17 corresponding to the fixed magnet 16, and the heat dissipation fins are used for locally cooling the volute casing 1, the counterweight rotor 8, the moving magnet 15 and the fixed magnet 16, so that local overheating caused by an eddy current effect generated by relative magnetic induction linear cutting motion between the fixed magnet 16 and the moving magnet 15 is avoided.

Furthermore, the volute casing 1 is provided with an air inlet cover 18 arranged at the opening of the axial flow air inlet 3, and the air inlet cover is used for preventing foreign matters from entering the inside of the fan so as to ensure the use safety of the fan.

Further, one end of the spindle 6 is connected with the impeller 2 through a spindle seat 19.

Furthermore, the environment-friendly low-noise damping alternating-current centrifugal fan is characterized in that an insulating layer 20 is arranged between the iron core 9 and the winding 10.

The invention greatly improves and upgrades the internal structure under the existing fan frame, replaces the traditional bearing connection by the ball hinge of the mandrel and the middle pipe, ensures that the mandrel has all-directional deflection capability, can convert the vibration into the axis deflection of the mandrel when the fan generates the vibration in different directions, and then effectively buffers and inhibits the deflection by utilizing the angular momentum when the impeller and the counterweight rotor rotate, so that the pressure born by the internal parts such as the middle pipe and the like is obviously reduced, the abrasion among all parts is reduced, the stability, the safety and the service life of the fan are improved.

Meanwhile, the air flow sucked by the air compressor is accelerated by the aid of the conical compression air channel, and more external air is sucked by the aid of negative pressure generated at the throat, so that the suction volume of the fan is increased, the centrifugal compression effect of the fan on the air is improved, and the heat dissipation performance of the fan is improved.

In addition, the invention is based on negative pressure suction of the throat, the flow guide holes are arranged in a spiral bent shape, so that the flow direction of the airflow in the flow guide holes is changed, then the airflow flows out through the plurality of flow guide holes and is converged into a rotary vortex to enter the volute, the rotation direction of the vortex is consistent with the rotation direction of the impeller, the speed difference between the airflow and the impeller when the airflow enters the volute can be greatly reduced, the cutting of the impeller on the airflow is reduced, and the noise of the airflow is obviously inhibited and reduced.

Based on the structure, the spiral groove at the compression air channel is further utilized to guide the direction of the air flow, so that the direction of the air flow entering the volute is consistent, meanwhile, the air guide sleeve is matched with the compression air channel to further compress and accelerate the air flow, the negative pressure effect at the throat is improved, the air intake is further improved, and the heat dissipation performance of the fan is improved.

Claims

1. An environment-friendly low-noise damping alternating-current centrifugal fan comprises a volute (1) and an impeller (2) arranged in the volute, wherein an axial-flow air inlet (3) and a centrifugal air outlet (4) are formed in the volute (1), the environment-friendly low-noise damping alternating-current centrifugal fan is characterized in that a middle pipe (5) which is coaxial with the impeller (2) is arranged on the volute (1), one end of the middle pipe is connected with the volute (1), a mandrel (6) which is arranged on the inner side of the middle pipe (5) is arranged on the impeller (2), one end of the mandrel (6) is connected with the impeller (2), the middle of the mandrel (6) is hinged with the middle pipe (5) through a sphere (7), and the other end of the mandrel (6) penetrates through the middle pipe (5); an iron core (9) arranged on the outer side of the middle pipe (5) is arranged on the middle pipe (5), a winding (10) is wound on the outer side of the iron core (9), and a rotor (11) surrounding the iron core (9) is arranged on the impeller (2); a movable magnet (15) which is coaxial with the counterweight rotor (8) is arranged on the counterweight rotor (8), and a fixed magnet (16) which corresponds to the movable magnet (15) is arranged on the volute (1);

the axial flow air inlet (3) consists of a compression air channel (301) with an outer conical opening and a straight cylindrical throat (302), the conical large end of the compression air channel (301) faces outwards, and two ends of the throat (302) are respectively communicated with the conical small end of the compression air channel (301) and the interior of the volute; a plurality of flow guide holes (12) are formed in the volute (1) and are arranged on the periphery of the throat (302), one end of each flow guide hole (12) is communicated with the throat (302), and the other end of each flow guide hole (12) is communicated with the outside of the volute (1); the diversion holes (12) are in the direction of a spiral curve; a plurality of spiral grooves (13) are circumferentially distributed on the conical inner wall of the compression air duct (301); the volute (1) is provided with a conical air guide sleeve (14) arranged on the inner side of the compression air duct (301), and the conical small end of the air guide sleeve (14) faces outwards.

2. An environment-friendly low-noise damping AC centrifugal fan according to claim 1, wherein the impeller (2) is a coil impeller composed of a rim (201), a wheel disc (202) and a plurality of blades (203), and the spindle (6) and the rotor (11) are respectively arranged on the rim (201).

3. An environment-friendly low-noise damping AC centrifugal fan as claimed in claim 1, wherein the volute (1) is provided with heat-dissipating fins (17) corresponding to the fixed magnet (16).

4. The environment-friendly low-noise damping alternating-current centrifugal fan as claimed in claim 1, wherein the volute (1) is provided with an air inlet cover (18) arranged at the opening of the axial-flow air inlet (3).

5. An environmentally friendly, low-noise and vibration-damping AC centrifugal fan according to claim 1, wherein one end of the spindle (6) is connected with the impeller (2) via a shaft seat (19).