CN205047515U - Centrifugal fan blade of moulding plastics - Google Patents
Centrifugal fan blade of moulding plastics Download PDFInfo
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- CN205047515U CN205047515U CN201520749377.7U CN201520749377U CN205047515U CN 205047515 U CN205047515 U CN 205047515U CN 201520749377 U CN201520749377 U CN 201520749377U CN 205047515 U CN205047515 U CN 205047515U
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Abstract
The utility model relates to a ventilation equipment field. Centrifugal fan blade of moulding plastics, including chassis, wheel hub, a plurality of blade and outer lane, the wheel hub outside is inboard even as an organic whole with the chassis, and the blade bottom is even as an organic whole with the chassis, and the outer lane is even as an organic whole with the lateral wall at blade top, and blade quantity is between 37~45, and not every blade central angle angle is all the same, blade central angle angle is the contained angle angle that forms between the adjacent blade and the centrifugal fan blade centre of a circle, the air inlet of blade is served and is equipped with a plurality of profile of tooth breachs, be equipped with a plurality of bumps on the blade backpressure face. This centrifugal fan blade of moulding plastics's advantage is novel structure, and the noise is low.
Description
Technical field
The utility model relates to field of ventilation equipment, particularly relates to a kind of centrifugation blade of injection moulding.
Background technique
Injection moulding centrifugation blade is product conventional in field of ventilation equipment, and injection moulding centrifugation blade comprises chassis, wheel hub and multiple blade, is connected as a single entity outside wheel hub with inside chassis, and blade bottom end and chassis are connected as a single entity.Centrifugation blade is moulding, in order to reduce the weight of product, generally can hold multiple material-saving hole on wheel hub.The deficiency that existing centrifugation blade exists is: (1) all blades are substantially all identical at the central angle of circumferentially arranging, even if there is fine distinction to be also caused by production error, when rotating, the frequency noise that each blade impact snail tongue produces is consistent, and the Rotation Noise of fan blade is high; (2) be smooth surface in the back pressure face of blade, the arc of blade back pressure surface in the outer part namely position in the outer part, middle part easily produce whirlpool when fan blade rotates, and then noise when increasing fan blade rotation; (3) blade air intake and medial extremity are burnishing surface, and fan blade is when air intake, and air intake great efforts, the blast before and after blade is large, and rotate the noise whirlpool produced large, the noise produced when causing fan blade to rotate is large.
Summary of the invention
The purpose of this utility model is the defect existed to solve existing injection moulding centrifugation blade, provides a kind of novel structure, the injection moulding centrifugation blade that noise is low.
In order to realize above-mentioned object, the utility model have employed following technological scheme:
Injection moulding centrifugation blade, comprise chassis, wheel hub, multiple blade and outer ring, be connected as a single entity outside wheel hub with inside chassis, blade bottom end and chassis are connected as a single entity, the outer side wall of outer ring and vane tip is connected as a single entity, blade quantity is between 37 ~ 45, and not every blade central angle angle is all identical, and described blade central angle angle refers to the angle angle formed between adjacent blades and the centrifugation blade center of circle; The air intake of blade is provided with multiple profile of tooth breach; Blade back pressure surface is provided with multiple salient point.
As preferably, the height of profile of tooth breach is 0.5% ~ 2% of fan blade diameter; The tooth pitch of profile of tooth breach is 1% ~ 3% of fan blade diameter.
As preferably, wheel hub is provided with multiple material-saving mouth.
As preferably, blade central angle angle is between 7 ° ~ 12 °.
As preferably, the shape of profile of tooth breach is triangle or trapezoidal.
As preferably, the spacing of salient point and blade outboard end is less than the spacing of salient point and blade medial extremity.
As preferably, the spacing of salient point and blade outboard end is 20% ~ 70% of the spacing of salient point and blade medial extremity; Salient point thickness is 10% ~ 25% of blade thickness, and salient point width is 10% ~ 25% of blade thickness, produces the position of whirlpool when the corresponding centrifugation blade of bump location rotates.
Have employed the injection moulding centrifugation blade of technique scheme, blade back pressure surface is provided with multiple salient point, and salient point can upset the whirlpool produced in this position when centrifugation blade rotates, and adopts the structure of salient point to reduce noise.Not every blade central angle angle is all identical, and when rotating, the frequency noise that each blade impact snail tongue produces is inconsistent, effectively can reduce the Rotation Noise of fan blade.The air intake of blade is provided with multiple profile of tooth breach, during air intake, can slow down air intake dynamics, reduces the blast before and after blade, reduces the noise whirlpool rotating and produce, and reduces noise.The advantage of this injection moulding centrifugation blade is novel structure, and noise is low.
Accompanying drawing explanation
Fig. 1: the structural representation of embodiment of the present utility model.
Embodiment
Below in conjunction with accompanying drawing 1, embodiment of the present utility model is made a detailed explanation.
A kind of injection moulding centrifugation blade as shown in Figure 1, comprises chassis 1, wheel hub 3, multiple blade 2 and outer ring 4, is connected as a single entity outside wheel hub 3 with inside chassis 1, and the bottom of all blades 2 is all connected as a single entity with chassis 1, and outer ring 4 is connected as a single entity with the outer side wall at blade 2 top.Wheel hub 3 is provided with multiple material-saving mouth 31, reduce further weight and the production cost of product.Blade 2 quantity 43.The center of centrifugation blade and the center of wheel hub 3 are provided with motor axis hole.
Chassis 1 is provided with 10 material-saving holes 11, and the area at least two material-saving holes 11 is different.Material-saving hole 11 is circular material-saving holes, and the center of circle in all material-saving holes 11 is identical to the distance between hub centre, and namely the center of circle in all material-saving holes 11 is in circumferentially same.The radius at least two material-saving holes 11 is different.The fixing production of home position in circular material-saving hole is the most convenient, by adjustment radius size and adjustable balance when especially home position is fixing, very convenient.Spacing between adjacent material-saving hole 11 has difference, and material-saving hole 11 uses as the initial unbalance of adjustment fan blade, and the spacing between adjacent material-saving hole 11 is more conducive to adjustment.The distance of the center of circle to blade 2 the inner in material-saving hole 11 is less than the distance of the center of circle to wheel hub 3 outer ledge in material-saving hole 11, and the outer end of chassis 1 when injection moulding by blade 2 more easily deforms, and therefore said structure is more conducive to preventing chassis 1 to be out of shape.Another effect in material-saving hole 11 is means of the initial unbalance as adjustment fan blade, the initial unbalance of traditional adjustment fan blade is by increasing balancing weight to reach the object of weight balancing at grammes per square metre lower, increases balancing weight and not only makes the weight of product increase the performance that impact uses but also the cost adding use.The mode that existing balancing weight increases the weight of is instead of by the mode of material-saving hole 11 loss of weight, specifically the object that weight that material-saving hole alleviates this place reaches weight balancing is set in grammes per square metre eminence, because the weight subtracted can not be completely the same, therefore there is material-saving hole 11 radius difference and the different reason of area everywhere.
Blade 2 back pressure face is provided with multiple salient point 21, salient point 21 and the spacing of blade 2 outboard end be less than convex 21 with the spacing of blade 2 medial extremity, salient point 21 and the spacing of blade 2 outboard end are salient points 21 and 55% of the spacing of blade 2 medial extremity.Salient point 21 thickness is 15% of blade 2 thickness, and salient point 21 width is 15% of blade 2 thickness.Salient point 21 can upset the whirlpool produced in this position when centrifugation blade rotates, and at least reduces 1.5dB noise.
The air intake of blade 2 is provided with multiple profile of tooth breach 22, and the height of profile of tooth breach 22 is 0.5% ~ 2% of fan blade diameter, and the tooth pitch of profile of tooth breach 22 is 1% ~ 3% of fan blade diameter.Traditional blades air intake and medial extremity are burnishing surface, fan blade when air intake, air intake great efforts, the blast before and after blade is large, rotate the noise whirlpool produced large, the noise produced when causing fan blade to rotate is large, and have employed the structure of profile of tooth breach, centrifugation blade is when air intake, air intake dynamics can be slowed down, reduce the blast before and after blade, reduce the noise whirlpool rotating and produce, at least reduce 1dB noise.
The medial extremity at blade 2 top is provided with arc angling, i.e. adopt arc transition between the air intake end face of blade tip face and blade, and the radius of circular arc is 12% of width of blade, increase incoming air area, reduce intake grill pressure reduction, increase air quantity 1% ~ 3%, at least reduce 1dB noise.
Not every blade central angle angle is all identical, and blade central angle angle refers to the angle angle formed between adjacent blades and the centrifugation blade center of circle, and blade central angle angle is between 7 ° ~ 12 °; When rotating, the frequency noise that each blade 2 impacts the generation of snail tongue is inconsistent, at least reduces the Rotation Noise 1.5dB of fan blade.
For the centrifugation blade that the conventional model of our company is 360-43-130, centrifugation blade diameter 360mm, 43, blade, height 130mm, blade thickness is 4.2mm, width of blade 33mm, except material-saving hole 11, salient point 21, all physical dimension of profile of tooth breach 22 except blade central angle angle are identical with conventional centrifugal fan blade, adopt the centrifugation blade of this patent structure compared with the centrifugation blade of the same model size of conventional construction, refer to following performance comparison table.
| 360-43-130 | Weight g | Level of noise dB | Air quantity m 3/h |
| Conventional construction | 1350 | 44 | 880 |
| This patent structure | 1320 | 38 | 905 |
Above-described embodiment is only this patent preferably mode of execution, and such as blade quantity can adjust between 37 ~ 45, and salient point 21 is 20% ~ 70% of the spacing of salient point 21 and blade 2 medial extremity with the spacing of blade 2 outboard end, and concrete numerical value can adjust; Salient point 21 thickness is 10% ~ 25% of blade 2 thickness, and salient point 21 width is 10% ~ 25% of blade 2 thickness, and the radius of circular arc is 8% ~ 25% of width of blade, all can adjust with the difference of product.
Claims (7)
1. injection moulding centrifugation blade, comprise chassis, wheel hub, multiple blade and outer ring, be connected as a single entity outside wheel hub with inside chassis, blade bottom end and chassis are connected as a single entity, the outer side wall of outer ring and vane tip is connected as a single entity, it is characterized in that: blade quantity is between 37 ~ 45, and not every blade central angle angle is all identical, and described blade central angle angle refers to the angle angle formed between adjacent blades and the centrifugation blade center of circle; The air intake of blade is provided with multiple profile of tooth breach; Blade back pressure surface is provided with multiple salient point.
2. injection moulding centrifugation blade according to claim 1, is characterized in that the height of profile of tooth breach is 0.5% ~ 2% of fan blade diameter; The tooth pitch of profile of tooth breach is 1% ~ 3% of fan blade diameter.
3. injection moulding centrifugation blade according to claim 1, is characterized in that wheel hub is provided with multiple material-saving mouth.
4. injection moulding centrifugation blade according to claim 1, is characterized in that blade central angle angle is between 7 ° ~ 12 °.
5. injection moulding centrifugation blade according to claim 2, is characterized in that the shape of profile of tooth breach is triangle or trapezoidal.
6. injection moulding centrifugation blade according to claim 1, is characterized in that the spacing of salient point and blade outboard end is less than the spacing of salient point and blade medial extremity.
7. injection moulding centrifugation blade according to claim 6, is characterized in that the spacing of salient point and blade outboard end is 20% ~ 70% of the spacing of salient point and blade medial extremity; Salient point thickness is 10% ~ 25% of blade thickness, and salient point width is 10% ~ 25% of blade thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520749377.7U CN205047515U (en) | 2015-09-25 | 2015-09-25 | Centrifugal fan blade of moulding plastics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520749377.7U CN205047515U (en) | 2015-09-25 | 2015-09-25 | Centrifugal fan blade of moulding plastics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205047515U true CN205047515U (en) | 2016-02-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520749377.7U Active CN205047515U (en) | 2015-09-25 | 2015-09-25 | Centrifugal fan blade of moulding plastics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205047515U (en) |
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2015
- 2015-09-25 CN CN201520749377.7U patent/CN205047515U/en active Active
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |