CN207750266U

CN207750266U - A kind of centrifugal blower

Info

Publication number: CN207750266U
Application number: CN201721857289.4U
Authority: CN
Inventors: 许范; 王梅玲; 邓高明; 娄中志; 侯玉光; 辛庆庆; 杜伟伟; 铁静; 李春海; 郭永刚
Original assignee: YUXIN AUTOMOTIVE AIR CONDUITIONER CO Ltd
Current assignee: Yuxin Automotive Thermal Management Technology Co Ltd
Priority date: 2017-12-27
Filing date: 2017-12-27
Publication date: 2018-08-21
Anticipated expiration: 2027-12-27

Abstract

The utility model discloses a kind of centrifugal blowers, including motor, spiral case, the impeller being arranged on spiral case and the shroud being arranged on impeller, spiral case inner wall far from motor side is provided with one week ring-shaped depression, the diameter of the ring-shaped depression is more than the diameter of impeller, the utility model inhibits air-flow to be flowed near the shroud of impeller along the wall surface of spiral case, so that the air-flow that impeller inlet is flowed back in the gap by impeller front disc and spiral case is reduced, to reach promotion fan efficiency, reduces the purpose of noise.

Description

A kind of centrifugal blower

Technical field

The utility model is related to centrifugal blower technical fields, and in particular to a kind of centrifugal blower.

Background technology

Fan for air conditioner on vehicle is centrifugal fan, and flowing of the gas in impeller is as shown in Figure 1, gas first passes through impeller Entrance sucks, and then gas about turns 90 DEG C of runners for flowing through impeller blade composition, after gas obtains energy in the impeller of rotation Outflow impeller enters spiral case, flowing of the gas in spiral case as shown in Fig. 2, the gas that spiral case throws away impeller concentrate, water conservancy diversion, from Ventilation blower outlet discharge, after gas is thrown out of, the pressure of impeller center part reduces, and ambient atmos are by impeller front disc from wind turbine Import sucking, continuously to car convey gas.

After gas leaves impeller, a part of air-flow is flowed to along spiral case wall surface near the shroud of impeller, this fraction is logical It crosses behind the gap of impeller front disc and spiral case and flows back to impeller inlet, this is because gas is flow to from fan inlet up to impeller inlet Static pressure reduces due to constantly overcoming flow resistance in the process, and the fluid energy reached at shroud position is relatively low, causes Adverse pressure gradient is generated in runner, to which backflow phenomenon occur at shroud position, the presence of these reflux, on the one hand to wind turbine Whole efficiency has an impact, and disturbance on the other hand can also be caused to generate so as to cause secondary noise to inlet air flow.

Utility model content

The technical problem to be solved by the present invention is to provide a kind of reasonable for structure, centrifugal blower efficiency is promoted, reduction is made an uproar The centrifugal blower of sound.

The task of the utility model is done in such a way that a kind of centrifugal blower, including motor, spiral case, setting are in spiral case Impeller and the shroud that is arranged on impeller, it is characterised in that：Spiral case inner wall far from motor side is provided with one week annular Recess, the diameter of the ring-shaped depression are more than the diameter of impeller.

Preferably, the ring-shaped depression is by first surface, third curved surface and for connecting first surface and third curved surface The second curved surface composition, the cross section of ring-shaped depression is irregular U-shaped, first surface and the second curved surface in three curved surfaces It is C-shaped gap with the end edge shape of shroud.

Preferably, the ring-shaped depression surface is provided with the noise reduction hole of circular array arrangement.

Preferably, the noise reduction hole is set to the end far from first surface and the second curved surface junction on the second curved surface.

Preferably, the noise reduction hole is 4, aperture 2mm-10mm.

The utility model inhibits air-flow to be flowed near the shroud of impeller along the wall surface of spiral case, makes through impeller front disc and snail The air-flow that impeller inlet is flowed back in the gap of shell reduces, and to reach promotion fan efficiency, reduces the purpose of noise.

Description of the drawings

Fig. 1 is flow schematic diagram of the gas in impeller in the prior art；

Fig. 2 is flow schematic diagram of the gas in spiral case in the prior art；

Fig. 3 is the structural schematic diagram of the utility model；

Fig. 4 is the noise spectrum comparison diagram of the prior art and the utility model.

Drawing explanation：1, impeller, 2, shroud, 3, spiral case, 4, noise reduction hole, 5, ring-shaped depression, 6, impeller eye, 7, C fonts Gap, 8, motor.

Specific implementation mode

It is described in detail the technical solution of the utility model in conjunction with attached drawing, a kind of centrifugal blower, including motor 8, spiral case 3, set The shroud 2 set the impeller 1 in spiral case and be arranged on impeller, the spiral case inner wall far from motor side are provided with one week annular Recess 5, the diameter of the ring-shaped depression are more than the diameter of impeller, and the ring-shaped depression is by first surface, third curved surface and use It is formed in the second curved surface of connection first surface and third curved surface, the cross section of ring-shaped depression is irregular U-shaped, three songs The end edge shape of first surface and the second curved surface and shroud in face is C-shaped gap 7, and the ring-shaped depression surface is provided with The noise reduction hole 4 of circular array arrangement, the noise reduction hole is set on the second curved surface to be connected far from first surface and the second curved surface The end of second curved surface at place, the noise reduction hole are 4, aperture 2mm-10mm.

The present invention increases ring-shaped depression on the basis of existing spiral case, and ring-shaped depression is made of three curved surfaces, on the one hand annular Recess is inside air-flow guiding spiral case flow toward shroud direction along spiral case wall surface, another aspect ring-shaped depression and shroud wall surface Forming a C fonts gap prevents air-flow from flowing back to impeller eye 6, and noise reduction hole is arranged in ring-shaped depression circumferencial direction, ring-shaped depression Although setting can prevent major part air-flow flow back to impeller eye along spiral case wall surface, be limited to ring-shaped depression and shroud there are still Gap has fraction and flows back to impeller by C fonts gap, by the way that noise reduction hole is arranged so that this fraction passes through noise reduction hole Spiral case is flowed out, to further air-flow be prevented to flow back to impeller by C fonts gap, by inhibiting air-flow to flow back to impeller by shroud On the one hand entrance can improve fan efficiency, on the other hand can eliminate two because of the secondary disturbance generation to inlet air flow of shroud Secondary noise, with reference to attached drawing 4, the spiral case noise spectrum that the front and back noise pattern of spiral case optimization can be seen that the utility model is bent Line is less than the noise using prior art spiral case.

The basic principle of the utility model, main feature and advantage has been shown and described above, it is new not departing from this practicality Under the premise of type spirit and scope, the utility model also has various changes and modifications, these changes and improvements both fall within requirement and protect The scope of the utility model of shield.

Claims

1. a kind of centrifugal blower, including motor, spiral case, the impeller being arranged in spiral case and the shroud being arranged on impeller, It is characterized in that：Spiral case inner wall far from motor side is provided with one week ring-shaped depression, and the diameter of the ring-shaped depression is more than impeller Diameter.

2. a kind of centrifugal blower according to claim 1, it is characterised in that：The ring-shaped depression is by first surface, third Curved surface and the second curved surface for connecting first surface and third curved surface form, and the cross section of ring-shaped depression is irregular U Font, first surface and the end edge shape of the second curved surface and shroud in three curved surfaces are C-shaped gap.

3. a kind of centrifugal blower according to claim 2, it is characterised in that：The ring-shaped depression surface is provided in a ring The noise reduction hole of array arrangement.

4. a kind of centrifugal blower according to claim 3, it is characterised in that：The noise reduction hole is set on the second curved surface far End from first surface and the second curved surface junction.

5. a kind of centrifugal blower according to claim 3, it is characterised in that：The noise reduction hole is 4, aperture 2mm- 10mm。