CN2665423Y - Flow guiding low noise draught fan - Google Patents
Flow guiding low noise draught fan Download PDFInfo
- Publication number
- CN2665423Y CN2665423Y CN 200320110115 CN200320110115U CN2665423Y CN 2665423 Y CN2665423 Y CN 2665423Y CN 200320110115 CN200320110115 CN 200320110115 CN 200320110115 U CN200320110115 U CN 200320110115U CN 2665423 Y CN2665423 Y CN 2665423Y
- Authority
- CN
- China
- Prior art keywords
- flow guide
- air inlet
- inlet duct
- low noise
- blower fan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a deflector-type low-noise fan, comprising a shell, impeller rotors, vanes and an inlet passage. A deflector formed by five to sixteen helical curved plates is arranged in the inlet passage. The helical curved plates are evenly distributed around the central line of the inlet passage. The helix angle at the outlet of the deflector is less than or equal to 30 degrees. A contrary blast fence is arranged at the upper end of the back of the vane working face. The utility model effectively reduces the noise by the fan and improves the efficiency of the fan.
Description
Technical field
The utility model relates to a kind of blower fan, is specifically related to a kind of low noise blower fan.
Background technique
Usually centrifugal blower in working order down, air-flow directly strikes a side of impeller from the cavity (zone that does not have blade) at the center of intake grill vane rotor, then air-flow enters the moment of blade, momentum on the circumference that the blade that begins to be rotated applies, air peripheral velocity in the very short time changes to WR from approximate zero (W is the arc speed of impeller like this, R is the distance of the inlet edge of blade to the blade center), the flip-flop of this twice momentum of air-flow is to cause that inlet produces the main cause of noise.The impact of the air-flow of the back side import of front side of vane also can produce noise during axial-flow blower work.At this a part of noise, traditional way is at the import and export of blower fan baffler to be installed, but this can not eliminate this a part of noise from root.
The model utility content
In order to overcome blower fan (centrifugal fan or axial fan) noise problem, the purpose of this utility model provides a kind of blower fan that noise is reduced.
The utility model is that the technological scheme that its purpose of realization is taked is:
Flow guide type low noise blower fan comprises housing, vane rotor, blade and air inlet duct, it is characterized in that being provided with in the described air inlet duct flow guide device that is made of 5～16 helical curve panels, and the helical curve panel is evenly arranged around the air inlet duct center line.
Described helical curve panel is the variable-pitch auger curved plate, along the pitch of airflow direction curved plate helical curve by diminishing greatly gradually, be tending towards infinitely great in air inlet duct ingress pitch, pitch goes to zero in the flow guide device outlet port, and the lead angle in the flow guide device outlet port is≤30 °.
The curved plate of described flow guide device stretches out the distinguished and admirable outlet of air inlet duct, and its extrusion is less than 2/3rds of distance between distinguished and admirable outlet end of air inlet duct and the vane rotor front-end face.
The curved plate of flow guide device welds or is riveted on the air inlet duct inwall.
The upper end portion, the front side of vane back side of described vane rotor is provided with contrary blast fence.
The length of described contrary blast fence less than two leaf angles to 2/3rds of arc length.
The utility model reduces the design principle of noise: the one, reduce its bump by the angle that reduces the airflow collision impeller side to impeller side, make air-flow enter the rotational speed of the preceding instantaneous rotational speed of blade near blade edge, for axial-flow blower, since the gas flow modulation of the effect of fluid director rotation enter the air-flow entrance angle of axial-flow fan blade, thereby reduce the bump of air-flow to vacuum side of blade.The 2nd, because when vane rotor rotates, the impeller back side has a negative pressuren zone all the time, and big more near front side of vane upper rear portion negative pressure, the noise that herein causes is big more, can effectively reduce noise so establish contrary air-flow plate washer in the upper end portion, the front side of vane back side of vane rotor.
The beneficial effects of the utility model:, not only reduced fan noise effectively, but also improved fan efficiency owing to be provided with flow guide device in the blower ventilation road and on blade, established contrary blast fence.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified:
Fig. 1 is the utility model centrifugal blower structural representation.
Fig. 2 is an air inlet duct A-A sectional view.
Fig. 3 is an air inlet duct B-B sectional view.
Fig. 4 is the utility model centrifugal blower generalized section.
Fig. 5 is a fluid director helical curve panel main body schematic representation.
Fig. 6 is that embodiment's 2 helical curve panels are arranged schematic representation
Fig. 7 is the vane rotor schematic representation that is provided with contrary blast fence.
Among the figure 1, air inlet duct, 2, the helical curve panel, 3, blade, 4, contrary air-flow plate washer, 5, vane rotor, 6, the blower fan main body, 7, housing.
Embodiment
Eight helical curve panels 2 are set in the air inlet duct 1 of the present utility model, have constituted an air flow guiding device thus, shown in Fig. 1,2,3,5.Helical curve panel 2 evenly arranges around the air inlet duct center line, promptly between two curved plates angle right arc length equate.The pitch of curved plate helical curve by diminishing greatly gradually, is tending towards infinitely great in air inlet duct ingress pitch along airflow direction, and pitch goes to zero in the flow guide device outlet port, and the helix angle in flow guide device outlet port is 15 degree.The helical curve panel stretches out the air inlet duct outlet end.In the present embodiment its extrusion a be between outlet end and the vane rotor front-end face distance b 1/2nd, as shown in Figure 4.The helical curve panel can be connected by welding or riveted joint mode with the air inlet duct inwall.The top of helical curve panel can link together, and as shown in Figure 2, or its top is not connected, and the middle part is hollow shape, as shown in Figure 6., there is a negative pressuren zone in vane rotor when rotation all the time at the back side of front side of vane, and big more the closer to the negative pressure at the back side of vane rotor outlet port front side of vane.Therefore, during blade working, vane rotor has one air-flow suck-back all the time and advances in the vane rotor, and the load that this has increased vane rotor has caused bigger noise.Be head it off, the utility model increases a contrary air-flow barge board 4 to each outlet of vane rotor, and contrary air-flow barge board 4 is arranged at blade 3 ends, its length be two leaf angles to 1/3rd of arc length.Contrary air-flow plate washer 4 can or adopt the mode of welding to be connected with blade 3 cast inblocks, as shown in Figure 7.
Claims (6)
1, flow guide type low noise blower fan comprises housing, vane rotor, blade and air inlet duct, it is characterized in that being provided with in the described air inlet duct flow guide device that is made of 5～16 helical curve panels, and the helical curve panel is evenly arranged around the air inlet duct center line.
2, flow guide type low noise blower fan according to claim 1, it is characterized in that described helical curve panel is the variable-pitch auger curved plate, along the pitch of airflow direction curved plate helical curve by diminishing greatly gradually, be tending towards infinitely great in air inlet duct ingress pitch, pitch goes to zero in the flow guide device outlet port, and the lead angle in the flow guide device outlet port is≤30 °.
3, flow guide type low noise blower fan according to claim 1 and 2 is characterized in that the curved plate of described flow guide device stretches out the distinguished and admirable outlet of air inlet duct, and its extrusion is less than 2/3rds of distance between distinguished and admirable outlet end of air inlet duct and the vane rotor front-end face.
4, flow guide type low noise blower fan according to claim 3 is characterized in that the curved plate of flow guide device welds or is riveted on the air inlet duct inwall.
5, flow guide type low noise blower fan according to claim 1 and 2 is characterized in that the upper end portion, the front side of vane back side of described vane rotor is provided with contrary blast fence.
6, flow guide type low noise blower fan according to claim 5, the length that it is characterized in that described contrary blast fence less than two leaf angles to 2/3rds of arc length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320110115 CN2665423Y (en) | 2003-10-10 | 2003-10-10 | Flow guiding low noise draught fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320110115 CN2665423Y (en) | 2003-10-10 | 2003-10-10 | Flow guiding low noise draught fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2665423Y true CN2665423Y (en) | 2004-12-22 |
Family
ID=34343513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320110115 Expired - Fee Related CN2665423Y (en) | 2003-10-10 | 2003-10-10 | Flow guiding low noise draught fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2665423Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102840170A (en) * | 2012-10-09 | 2012-12-26 | 宁波风机有限公司 | Air inlet guiding device for large-sized centrifugal fan |
| CN106015092A (en) * | 2016-07-13 | 2016-10-12 | 重庆沃亚机械有限公司 | High-efficiency energy-saving fan |
| CN106345025A (en) * | 2016-11-18 | 2017-01-25 | 泰锐菲克（天津）医疗科技有限公司 | Amortization cover and breathing machine |
| CN110296523A (en) * | 2019-07-01 | 2019-10-01 | 珠海格力电器股份有限公司 | Spoiler for improving fixing reliability and air conditioning unit using same |
-
2003
- 2003-10-10 CN CN 200320110115 patent/CN2665423Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102840170A (en) * | 2012-10-09 | 2012-12-26 | 宁波风机有限公司 | Air inlet guiding device for large-sized centrifugal fan |
| CN102840170B (en) * | 2012-10-09 | 2016-01-27 | 宁波风机有限公司 | A kind of large centrifugal fan intake grill flow guide device |
| CN106015092A (en) * | 2016-07-13 | 2016-10-12 | 重庆沃亚机械有限公司 | High-efficiency energy-saving fan |
| CN106345025A (en) * | 2016-11-18 | 2017-01-25 | 泰锐菲克（天津）医疗科技有限公司 | Amortization cover and breathing machine |
| CN110296523A (en) * | 2019-07-01 | 2019-10-01 | 珠海格力电器股份有限公司 | Spoiler for improving fixing reliability and air conditioning unit using same |
| CN110296523B (en) * | 2019-07-01 | 2022-04-19 | 珠海格力电器股份有限公司 | Spoiler for improving fixing reliability and air conditioning unit using same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |