CN214742208U

CN214742208U - Centrifugal fan driven by squirrel-cage disc type self-starting permanent magnet synchronous motor

Info

Publication number: CN214742208U
Application number: CN202120608412.9U
Authority: CN
Inventors: 黄诚; 周磊
Original assignee: Huanyi Electromagnetic Technology Yichang Co ltd
Current assignee: Huanyi Electromagnetic Technology Yichang Co ltd
Priority date: 2021-03-25
Filing date: 2021-03-25
Publication date: 2021-11-16
Anticipated expiration: 2031-03-25

Abstract

The utility model discloses a squirrel-cage disc type self-starting permanent magnet synchronous motor driven centrifugal fan, which comprises a base, a motor and a volute, wherein the motor and the volute are arranged on the base; the volute is provided with an air inlet and an air outlet; the motor comprises a shell, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are positioned in the shell; the rotor assembly comprises a rotor shaft and a rotor iron core sleeved outside the rotor shaft, and the tail end of the rotor shaft is provided with an impeller which is positioned inside the volute; bearings are arranged at two ends of the rotor shaft and are mounted on the shell; the utility model discloses a set up the abatvoix at the spiral case inner wall, set up a plurality of guide plates at the air intake of spiral case and carry out the water conservancy diversion to the admission medium, greatly reduced the pneumatic noise that centrifugal fan during operation produced, very big improvement the factory production environment.

Description

Centrifugal fan driven by squirrel-cage disc type self-starting permanent magnet synchronous motor

Technical Field

The utility model belongs to the technical field of centrifugal fan equipment, especially, relate to a squirrel cage disc formula self-starting PMSM driven centrifugal fan.

Background

The centrifugal fan utilizes an impeller (centrifugal force) rotating at high speed to do work on a gas medium, and changes the flow direction and the flow speed of the medium to convert the kinetic energy of the medium into potential energy (pressure energy). The fan has wide application fields, such as building engineering, boilers, chemical industry, petroleum industry, environmental protection industry and the like, and has considerable application prospect. However, the working noise is continuously subjected to 'scaling' by people, mainly, the noise seriously affects the comfort of production and life of people and even harms the health of people, so that the noise of the fan has the influence which cannot be ignored. With the enhancement of environmental awareness of people, environmental protection departments also begin to strictly control and refine relevant indexes of the noise. Therefore, the noise reduction type fan structure will still be the key point and difficulty point of fan product design work in the future.

The main noise sources of centrifugal fans include: aerodynamic noise, electromagnetic noise, and mechanical noise. With the continuous improvement of the processing technology of fan products, compared with pneumatic noise, the influence of mechanical noise and electromagnetic noise is almost not significant. The aerodynamic noise is a main component of the fan noise, and the generation reason of the aerodynamic noise is necessarily related to the internal flow field of the fan. The centrifugal fan belongs to driven fluid machinery, and based on the structural characteristics of multiple curvatures, when the Reynolds number is higher, a flow field can show unsteady characteristics in time and space. The inner part of the flow is often generated with phenomena of secondary flow, jet flow, wake flow and the like due to uneven flow, accompanying vortex flows are usually generated in the complex flow phenomena, and aerodynamic noise is often formed by stretching and breaking of the accompanying vortex flows. The generation reason of the pneumatic noise of the centrifugal fan becomes extremely complex due to various types and motion modes of the vortex in the flow field.

However, some researchers still focus mainly on the radiation of the aerodynamic noise in the free sound field, and neglect the influence of the mechanical structure, such as the volute, the air inlet and other main components, on the sound wave propagation.

Disclosure of Invention

The utility model aims at providing a squirrel cage disc formula self-starting PMSM driven centrifugal fan to the problem that prior art exists.

In order to achieve the above object, the utility model adopts the following technical scheme:

a centrifugal fan driven by a squirrel-cage disc type self-starting permanent magnet synchronous motor comprises a base, a motor and a volute, wherein the motor and the volute are arranged on the base; the volute is provided with an air inlet and an air outlet; the motor comprises a shell, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are positioned in the shell; the rotor assembly comprises a rotor shaft and a rotor iron core sleeved outside the rotor shaft, and the tail end of the rotor shaft is provided with an impeller which is positioned inside the volute; bearings are arranged at two ends of the rotor shaft and are mounted on the shell; the rotor core comprises a first rotor core, and the first rotor core is of a squirrel-cage structure; the stator core comprises a first stator core, and the first stator core is arranged on the inner wall of the shell along the circumferential direction of the first rotor core; a plurality of magnetic shoes are embedded in the first rotor core, so that magnetic flux is improved, and motor efficiency is improved.

Specifically, the rotor core comprises a second rotor core, and the stator core comprises a second stator core; the second rotor core and the second stator core are disc cores, and the second rotor core and the second stator core are arranged at intervals along the axial direction of the rotor shaft. Through setting up disk rotor core and stator core, can further improve the efficiency of motor to reduce fan energy consumption, reduce the volume.

Specifically, be equipped with the blotter between motor and the base, play the effect of buffering for reduce the mechanical noise of centrifugal fan during operation.

Specifically, the inner wall of spiral case is equipped with the abatvoix, the surface of abatvoix is equipped with the honeycomb holes that the array was arranged, the abatvoix is made for inhaling the sound material, through setting up the abatvoix, can play the effect that reduces the pneumatic noise of centrifugal fan.

Specifically, the air inlet of the volute is provided with a flow guide assembly.

Furthermore, the water conservancy diversion subassembly includes a plurality of guide plates, and is a plurality of the guide plate is evenly arranged along the air intake inner wall circumference of spiral case, carries out the water conservancy diversion to the medium that admits air through setting up the guide plate, can guarantee that the medium admits air steady equilibrium, does not have phenomenons such as backward flow and secondary flow, and the abatvoix that the cooperation spiral case inner wall set up can further improve the effect of making an uproar.

Compared with the prior art, the beneficial effects of the utility model are that: (1) the utility model can further improve the efficiency of the motor by arranging the disc type rotor core and the disc type stator core, thereby reducing the energy consumption of the fan and the volume; (2) the utility model has the advantages that the sound-absorbing board is arranged on the inner wall of the volute casing, so that the pneumatic noise of the centrifugal fan can be reduced; (3) the utility model discloses an air intake at the spiral case sets up a plurality of guide plates and carries out the water conservancy diversion to the medium that admits air, can further improve the effect of making an uproar of falling.

Drawings

Fig. 1 is a schematic structural diagram of a centrifugal fan driven by a squirrel-cage disc type self-starting permanent magnet synchronous motor according to an embodiment of the present invention;

fig. 2 is a schematic view of an internal structure of a motor according to an embodiment of the present invention;

fig. 3 is a schematic structural view of the sound-absorbing board inside the volute according to the embodiment of the present invention;

fig. 4 is a schematic view of a guide plate mounting structure of a volute air inlet in an embodiment of the present invention;

in the figure: 1. a base; 2. a motor; 3. a volute; 4. an air inlet; 5. an air outlet; 6. a housing; 7. a rotor shaft; 8. an impeller; 9. a bearing; 10. a first rotor core; 11. a first stator core; 12. a magnetic shoe; 13. a second rotor core; 14. a second stator core; 15. a cushion pad; 16. a sound-absorbing panel; 17. a baffle.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the present embodiment provides a centrifugal fan driven by a squirrel-cage disc self-starting permanent magnet synchronous motor, which includes a base 1, a motor 2 and a volute 3, where the motor 2 and the volute 3 are installed on the base 1; the volute 3 is provided with an air inlet 4 and an air outlet 5; the motor 2 comprises a shell 6, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are positioned in the shell 6, and the stator assembly comprises a stator core and a winding wound outside the stator core; the rotor assembly comprises a rotor shaft 7 and a rotor iron core sleeved outside the rotor shaft 7, an impeller 8 is arranged at the tail end of the rotor shaft 7, and the impeller 8 is positioned inside the volute 3; bearings 9 are arranged at two ends of the rotor shaft 7, and the bearings 9 are arranged on the shell 6; the rotor core comprises a first rotor core 10, and the first rotor core 10 is of a squirrel-cage structure; the stator core comprises a first stator core 11, and the first stator core 11 is arranged on the inner wall of the shell 6 along the circumferential direction of the first rotor core 10; a plurality of magnetic shoes 12 are embedded in the first rotor core 10, so that the magnetic flux is increased, and the efficiency of the motor 2 is improved.

Specifically, the rotor core includes a second rotor core 13, and the stator core includes a second stator core 14; the second rotor core 13 and the second stator core 14 are disk cores, and the second rotor core 13 and the second stator core 14 are axially arranged along the rotor shaft 7 at intervals. Through setting up disk rotor core and stator core, can further improve motor 2's efficiency to reduce the fan energy consumption, reduce the volume.

Specifically, a buffer pad 15 is arranged between the motor 2 and the base 1, and plays a role of buffering, so as to reduce mechanical noise when the centrifugal fan works.

Specifically, as shown in fig. 3, the inner wall of the spiral case 3 is provided with an acoustic board 16 (only the acoustic board structure of one inner wall of the spiral case is shown in the drawing, and during the specific implementation, the acoustic board can be arranged on all the four inner walls of the spiral case), the surface of the acoustic board 16 is provided with honeycomb holes arranged in an array, the acoustic board 16 is made of an acoustic material, and the acoustic board 16 is arranged to play a role in reducing the pneumatic noise of the centrifugal fan.

Preferably, in this embodiment, the side wall of the volute 3 is a double-layer hollow structure, a gap is left between the sound-absorbing plate 16 and the inner wall of the volute 3, a first sound-absorbing chamber is formed between the sound-absorbing plate 16 and the inner wall of the volute 3, the inner hollow structure of the side wall of the volute 3 is a second sound-absorbing chamber, and the noise reduction effect can be improved to the maximum extent by arranging the double-layer sound-absorbing structure.

Specifically, as shown in fig. 4, the air inlet 4 of the volute 3 is provided with a flow guiding assembly.

Further, the water conservancy diversion subassembly includes a plurality of guide plates 17, and is a plurality of guide plates 17 evenly arranges along 4 inner wall circumference of air intake of spiral case 3, carries out the water conservancy diversion to the medium of admitting air through setting up guide plate 17, can guarantee that the medium admits air steadily balanced, does not have phenomenons such as backward flow and secondary flow, and the abatvoix 16 of cooperation spiral case 3 inner wall setting can further improve the effect of making an uproar.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The centrifugal fan is characterized by comprising a base, a motor and a volute, wherein the motor and the volute are arranged on the base; the volute is provided with an air inlet and an air outlet; the motor comprises a shell, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are positioned in the shell; the rotor assembly comprises a rotor shaft and a rotor iron core sleeved outside the rotor shaft, and the tail end of the rotor shaft is provided with an impeller which is positioned inside the volute; bearings are arranged at two ends of the rotor shaft and are mounted on the shell; the rotor core comprises a first rotor core, and the first rotor core is of a squirrel-cage structure; the stator core comprises a first stator core, and the first stator core is arranged on the inner wall of the shell along the circumferential direction of the first rotor core; a plurality of magnetic tiles are embedded in the first rotor iron core.

2. The squirrel-cage disc self-starting PMSM-driven centrifugal fan of claim 1, wherein the rotor core includes a second rotor core and the stator core includes a second stator core; the second rotor core and the second stator core are disc cores, and the second rotor core and the second stator core are arranged at intervals along the axial direction of the rotor shaft.

3. The centrifugal fan driven by the squirrel-cage disc type self-starting permanent magnet synchronous motor as claimed in claim 1, wherein a cushion pad is arranged between the motor and the base.

4. The squirrel-cage disc type self-starting permanent magnet synchronous motor driven centrifugal fan as claimed in claim 1, wherein a sound-absorbing plate is arranged on the inner wall of the volute, and honeycomb holes arranged in an array are arranged on the surface of the sound-absorbing plate.

5. The squirrel-cage disc type self-starting permanent magnet synchronous motor driven centrifugal fan as claimed in claim 1, wherein an air inlet of the volute is provided with a flow guide assembly.

6. The squirrel-cage disc self-starting permanent magnet synchronous motor driven centrifugal fan of claim 5, wherein the flow guide assembly comprises a plurality of flow guide plates which are evenly arranged circumferentially along the inner wall of the air inlet of the volute.