CN203978927U - A kind of pair of air intake centrifugal blower fan - Google Patents
A kind of pair of air intake centrifugal blower fan Download PDFInfo
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- CN203978927U CN203978927U CN201420479666.5U CN201420479666U CN203978927U CN 203978927 U CN203978927 U CN 203978927U CN 201420479666 U CN201420479666 U CN 201420479666U CN 203978927 U CN203978927 U CN 203978927U
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Abstract
The utility model is a kind of pair of air intake centrifugal blower fan, comprise spiral case, two intake air impellers and motor, two intake air impellers are arranged in the rotating shaft of motor and are placed in spiral case, described spiral case comprises front shroud, back shroud and be placed in front shroud and back shroud between spiral case coaming plate, front shroud and back shroud offer advancing air passage and rear air intake passage in the position that aligns two intake air impellers, spiral case coaming plate offers air-out passage, described spiral case is provided with snail tongue in the position of corresponding air-out passage, described snail tongue comprises snail tongue curved surface, snail tongue curved surface is positioned at air-out passage one side, described snail tongue curved surface is indent, and asymmetrical curved surface.Snail tongue curved surface of the present utility model adopts indent and asymmetrical curved surface, can reduce rotational noise on the one hand, on the other hand, because the snail tongue profile line near impeller front and back ends circle adopts dark ligulate formula, snail tongue profile line near impeller central disc adopts shallow ligulate formula, can overcome like this due to the inhomogeneous problem causing of impeller outlet velocity distribution, be conducive to improve air quantity, blast and efficiency.
Description
Technical field
The utility model relates to a kind of blower fan, and a kind of pair of air intake centrifugal blower fan especially belongs to the improvement technology of two air intake centrifugal blower fans.
Background technique
At present, large suction range hood has become industry main flow, and two air intake centrifugal blower fans have that flow coefficient is large, pressure coefficient is high and the feature such as compact structure, meet the user demand of large suction kitchen ventilator.
Near centrifugal blower volute outlet, with tongue structure, be called snail tongue, its effect is that the air-flow of guiding spiral case outlet is shunted, and prevents that portion gas from circulating in spiral case.Difference according to the length of snail tongue and snail tongue from the radial distance of impeller, snail tongue is divided into the forms such as sharp tongue, dark tongue, shallow tongue peace tongue.Point tongue is the longest, the shortest from the radial distance of impeller, the most favourable to air quantity, blast and efficiency, but noise is maximum; And flat tongue is the shortest, the longest from the radial distance of impeller, to air quantity, blast and efficiency least favorable, but noise is best.Centrifugal blower for single admission, because air-flow need to turn over 90 ° from impeller inlet to impeller outlet, at impeller outlet, near shroud side, there is larger flow separation, form the vortex of low speed, so just cause impeller outlet speed skewness vertically, high near impeller hub disk side speed, low near impeller shroud side speed.If adopt straight snail tongue, just cannot take into account this inhomogeneous impeller outlet air-flow.Adopt sharp tongue, favourable to the low speed exit flow near impeller shroud side, can greatly reduce this part air-flow and produce the probability refluxing, but unfavorable to the high speed exit flow near impeller hub disk side, can produce very large Rotation Noise.Adopt flat tongue favourable to the high speed exit flow near impeller hub disk side, but very unfavorable to the low speed exit flow near impeller shroud side, being easy to produce and refluxing, air quantity, blast and efficiency all can sharply decline.
In order to overcome the defect of traditional snail tongue, Chinese Patent Application No. is 200610050639.6 to disclose " blower volute structure of the European type cooker hood that a kind of energy is double-faced ventilated ", it discloses a kind of asymmetric unidirectional incline tongue structure, this technology has adopted " active noise reduction " principle, make impeller outlet air-flow distribute vertically and there is certain phase difference the frequency of the Rotation Noise of snail tongue shock vibration generation, after the dephased noise source of this tool (the especially noise source of single spin-echo) stack, can obtain subduing to a certain extent, be conducive to reduce Rotation Noise.This technology is reasonably for the centrifugal blower of single air intake, but just not too suitable for centrifugal blower that can be double-faced ventilated.In order to solve the snail tongue problem of double-faced ventilated centrifugal blower, Chinese Patent Application No. is 201310742965.3 to disclose " a kind of range hood centrifugal blower with two air inlet structures ", it discloses a kind of snail tongue structure of inclined in two-way, its true dip direction is to be tilted to impeller front and back ends circle direction by impeller central disc, near impeller central disc place, adopt dark tongue design, near impeller front and back ends circle place, adopt shallow tongue design.This incline tongue has certain contribution to reducing aerodynamic noise, but is unfavorable in spiral case the especially air current flow at snail tongue place.Reason is that centrifugal impeller exit flow distributes is vertically inhomogeneous, and two intake air impeller exit velocities are become greatly gradually by front end circle to mid-game, then is diminished gradually by mid-game to rear end circle.So adopt the snail tongue being tilted to impeller front and back ends circle direction by impeller central disc to be easy to produce flow separation at it near impeller front and back ends circle side, form larger adverse pressure gradient, cause the generation refluxing, cause portion gas to circulate in spiral case, reduced air quantity, blast and the efficiency of blower fan.
Summary of the invention
The purpose of this utility model is at least one the deficiency overcoming described in above-mentioned prior art, and a kind of two air intake centrifugal blower fans that reduce Rotation Noise, improve air quantity are provided.
In order to achieve the above object, the technological scheme that the utility model is taked: a kind of pair of air intake centrifugal blower fan, comprise spiral case, two intake air impellers and motor, two intake air impellers are arranged in the rotating shaft of motor and are placed in spiral case, described spiral case comprises front shroud, back shroud and be placed in front shroud and back shroud between spiral case coaming plate, front shroud offers advancing air passage in the position that aligns two intake air impellers, back shroud is air intake passage after the position that aligns two intake air impellers offers, spiral case coaming plate offers air-out passage, described spiral case is provided with snail tongue in the position of corresponding air-out passage, described snail tongue comprises snail tongue curved surface, snail tongue curved surface is positioned at air-out passage one side, the curved surface that described snail tongue curved surface is indent.
In such scheme, due to the snail tongue curved surface curved surface that is indent, make impeller outlet air-flow distribute vertically and there is certain phase difference the frequency of the Rotation Noise of snail tongue shock vibration generation, be conducive to reduce Rotation Noise, on the other hand, because the snail tongue profile line near impeller front and back ends circle adopts dark ligulate formula, the snail tongue profile line of close impeller central disc adopts shallow ligulate formula, overcome due to the inhomogeneous problem causing of impeller outlet velocity distribution, be conducive to improve air quantity, blast and efficiency.
In order further to reduce Rotation Noise, above-mentioned snail tongue curved surface is indent and asymmetrical curved surface.
Preferably, above-mentioned snail tongue curved surface is connected and composed by top rake curved surface and rear-inclined curved surface, and the recess of snail tongue curved surface is positioned at the intersection place of top rake curved surface and rear-inclined curved surface.
Preferably, above-mentioned top rake curved surface and smooth excessive connection of rear-inclined curved surface.
Above-mentioned pair of intake air impeller includes front end circle, rear end circle, and is arranged on the mid-game between front end circle and rear end circle, and the intersection place plane of described top rake curved surface and rear-inclined curved surface and the midplane of described mid-game are along the distance L≤5mm of the axial direction of motor.Make the intersection of two inclination curved surfaces align with the mid-game of impeller as far as possible, to obtain better noise reduction.
Another program, the arc-shaped curved surface that above-mentioned snail tongue curved surface is indent.
For the ease of the installation of snail tongue, the profile line of the front end and back end of above-mentioned spiral case coaming plate overlaps along motor axis projection, and spiral case coaming plate is provided with fixed plate in the position near air-out passage, and snail tongue is fixed on fixed plate.
In order to simplify technique, above-mentioned snail tongue is independent moulding.
The inclined in two-way structural type that the snail tongue employing of double-faced ventilated centrifugal blower volute of the present utility model is tilted to impeller central disc direction respectively by impeller front and back ends circle, on the one hand, make impeller outlet air-flow distribute vertically and there is certain phase difference the frequency of the Rotation Noise of snail tongue shock vibration generation, after the stack of the dephased noise source of this tool, can obtain subduing to a certain extent, be conducive to reduce Rotation Noise, reach reduction rotational noise.On the other hand, because the snail tongue profile line near impeller front and back ends circle adopts dark ligulate formula, near the snail tongue profile line of impeller central disc, adopt shallow ligulate formula, thoroughly like this overcome due to the inhomogeneous problem causing of impeller outlet velocity distribution, be conducive to improve air quantity, blast and efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of 1 pair of air intake centrifugal blower fan of the utility model embodiment;
Fig. 2 is that Fig. 1 is along the sectional view of A-A direction;
Fig. 3 is that Fig. 1 is towards the projection view of F direction;
Fig. 4 is the structural representation of 1 pair of air intake centrifugal volute of blower of the utility model embodiment;
Fig. 5 is the structural representation of 1 pair of air intake centrifugal volute of blower of the utility model embodiment (hiding spiral case front shroud);
Fig. 6 is the structural representation of the spiral case coaming plate of the utility model centrifugal blower;
Fig. 7 is the structural representation of the utility model embodiment 1 snail tongue;
The structural representation of 2 pairs of air intake centrifugal volute of blower of Fig. 8 the utility model embodiment;
Fig. 9 is that Fig. 8 is towards the projection view of H direction;
Figure 10 is the structural representation of the utility model embodiment 2 snail tongues.
Embodiment
Below in conjunction with embodiment, the utility model is further described.Wherein, accompanying drawing is only for exemplary illustration, expression be only schematic diagram, but not pictorial diagram can not be interpreted as the restriction to this patent; For embodiment of the present utility model is described better, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product; For a person skilled in the art, in accompanying drawing some known configurations and explanation thereof may to omit be understandable.
The corresponding same or analogous parts of same or analogous label in the utility model embodiment's accompanying drawing, in description of the present utility model, it will be appreciated that, if have term " on ", D score, " left side ", " right side ", " front ", " afterwards ", " vertically ", orientation or the position relationship of indications such as " levels " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore the term of describing position relationship in accompanying drawing is only for exemplary illustration, can not be interpreted as the restriction to this patent.
embodiment 1
Of the present utility model pair of air intake centrifugal blower fan is as shown in Fig. 1 to 7, comprise spiral case 1, two intake air impellers 2 and motor 3, two intake air impellers 2 are arranged in the rotating shaft of motor 4 and are placed in spiral case 1, motor 4 fixes 6 in spiral case 1 by motor fixed rack, described spiral case 1 comprises front shroud 11, back shroud 13 and be placed in front shroud 11 and back shroud 13 between spiral case coaming plate 12, front shroud 11 offers advancing air passage 40 in the position that aligns two intake air impellers 2, back shroud 13 is air intake passage 42 after the position that aligns two intake air impellers 2 offers, advancing air passage 40 and rear air intake passage 42 are separately installed with air inlet ring 5, spiral case coaming plate 12 offers air-out passage 41, and the air-out port at air-out passage 41 is provided with spiral case flange 15, front shroud 11, spiral case coaming plate 12 is all connected with spiral case flange 15 with the position of back shroud 13 near the air-out port of air-out passage 41.
Above-mentioned spiral case 1 is provided with snail tongue 14 in the position of corresponding air-out passage 41, described snail tongue 14 comprises snail tongue front-end face 141, snail tongue curved surface 142, snail tongue ear end face 143 and stationary plane 144, snail tongue front-end face 141 is pressed close to or contacts with front shroud 11, snail tongue ear end face 143 is pressed close to or contacts with back shroud 13, snail tongue curved surface 142 is positioned at air-out passage 41 1 sides, and the curved surface that snail tongue curved surface 142 is indent, stationary plane 144 is positioned at a side relative with snail tongue curved surface 142, in the present embodiment, snail tongue 14 is independent moulding, the profile line of the front end and back end of spiral case coaming plate 12 overlaps along motor 3 axis projections, spiral case coaming plate 12 is provided with fixed plate 121 in the position near air-out passage 41, the stationary plane 144 of snail tongue 14 contacts with fixed plate 121, and snail tongue 14 is fixedly connected with by screw with fixed plate 121.
In the present embodiment, above-mentioned snail tongue curved surface 142 is indent and asymmetrical curved surface, preferably, snail tongue curved surface 142 is by top rake curved surface 142a and rear-inclined curved surface 142b is smooth excessively connects and composes, and the recess of snail tongue curved surface 142 is positioned at the intersection place of top rake curved surface 142a and rear-inclined curved surface 142b, and the intersection place plane of top rake curved surface 142a and rear-inclined curved surface 142b departs from the midplane of snail tongue 14.Above-mentioned pair of intake air impeller 2 includes front end circle 21, rear end circle 22, and be arranged on the mid-game 23 between front end circle 21 and rear end circle 22, the intersection place plane of described top rake curved surface 142a and rear-inclined curved surface 142b and the midplane of described mid-game 23 are along the distance L≤5mm of the axial direction of motor 3, make the intersection of top rake curved surface 142a and rear-inclined curved surface 142b align with the mid-game 23 of two intake air impellers 2 as far as possible, to obtain better noise reduction.
Working principle of the present utility model: snail tongue 14 adopts by before impeller, rear end circle 21, the snail tongue curved surface 142 that the 22 inclined in two-way structures that tilt to impeller central disc 23 directions respectively form, make snail tongue 14 near before impeller, rear end circle 21, 22 snail tongue profile line adopts dark ligulate formula, snail tongue profile line near impeller central disc 23 adopts shallow ligulate formula, overcome due to the inhomogeneous problem causing of impeller outlet velocity distribution, be conducive to improve air quantity, blast and efficiency, in addition, the frequency that makes the Rotation Noise that impeller 2 exit flows produce snail tongue curved surface 142 shock vibrations has certain phase difference along the axial distribution of motor, after the stack of the dephased noise source of this tool, can obtain subduing to a certain extent, be conducive to reduce Rotation Noise, reach reduction rotational noise.
Embodiment 2
Two air intake centrifugal blower fans of the present embodiment are similar to Example 1, its difference is: as shown in 8 to 10, the arc-shaped curved surface that above-mentioned snail tongue curved surface 142 is indent, and the front edge of snail tongue curved surface 142 and the distance of stationary plane 144 are greater than the distance of back edge and the stationary plane 144 of snail tongue curved surface 142, be the height that the height of snail tongue front-end face 141 is greater than snail tongue ear end face 143, make snail tongue curved surface 142 in non-middle symmetry status, be conducive to improve air quantity, blast and efficiency, also reach the better effects that reduces rotational noise.
The working principle of two air intake centrifugal blower fans of the present embodiment is identical with embodiment 1.
Obviously, above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to mode of execution of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all mode of executions.All any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in the protection domain of the utility model claim.
Claims (8)
1. a two air intake centrifugal blower fan, comprise spiral case (1), two intake air impellers (2) and motor (3), two intake air impellers (2) are arranged in the rotating shaft of motor (4) and are placed in spiral case (1), described spiral case (1) comprises front shroud (11), back shroud (13) and be placed in front shroud (11) and back shroud (13) between spiral case coaming plate (12), front shroud (11) offers advancing air passage (40) in the position that aligns two intake air impellers (2), back shroud (13) offers rear air intake passage (42) in the position that aligns two intake air impellers (2), spiral case coaming plate (12) offers air-out passage (41), described spiral case (1) is provided with snail tongue (14) in the position of corresponding air-out passage (41), described snail tongue (14) comprises snail tongue curved surface (142), snail tongue curved surface (142) is positioned at air-out passage (41) one sides, it is characterized in that, the curved surface that described snail tongue curved surface (142) is indent.
2. according to claim 1 pair of air intake centrifugal blower fan, is characterized in that, described snail tongue curved surface (142) is indent and asymmetrical curved surface.
3. according to claim 2 pair of air intake centrifugal blower fan, it is characterized in that, described snail tongue curved surface (142) is connected and composed by top rake curved surface (142a) and rear-inclined curved surface (142b), and the recess of snail tongue curved surface (142) is positioned at the intersection place of top rake curved surface (142a) and rear-inclined curved surface (142b).
4. according to claim 3 pair of air intake centrifugal blower fan, is characterized in that, described top rake curved surface (142a) and smooth excessive connection of rear-inclined curved surface (142b).
5. according to claim 4 pair of air intake centrifugal blower fan, it is characterized in that, described pair of intake air impeller (2) includes front end circle (21), rear end circle (22), and being arranged on the mid-game (23) between front end circle (21) and rear end circle (22), the intersection place plane of described top rake curved surface (142a) and rear-inclined curved surface (142b) and the midplane of described mid-game (23) are along the distance L≤5mm of the axial direction of motor (3).
6. according to claim 2 pair of air intake centrifugal blower fan, is characterized in that, the arc-shaped curved surface that described snail tongue curved surface (142) is indent.
7. according to the two air intake centrifugal blower fans described in claim 1 to 6 any one, it is characterized in that, the profile line of the front end and back end of described spiral case coaming plate (12) overlaps along motor (3) axis projection, and spiral case coaming plate (12) is provided with fixed plate (121) in the position near air-out passage (41), and snail tongue (14) is fixed on fixed plate (121).
8. according to claim 7 pair of air intake centrifugal blower fan, is characterized in that, described snail tongue (14) is independent moulding.
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| CN201420479666.5U CN203978927U (en) | 2014-08-22 | 2014-08-22 | A kind of pair of air intake centrifugal blower fan |
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| CN201420479666.5U CN203978927U (en) | 2014-08-22 | 2014-08-22 | A kind of pair of air intake centrifugal blower fan |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196761A (en) * | 2014-08-22 | 2014-12-10 | 广东海信家电有限公司 | Double-air-inlet centrifugal fan |
| CN104632666A (en) * | 2015-02-05 | 2015-05-20 | 镇江市丹徒区粮机厂有限公司 | High-power TLGF-HY-55-II material air blower |
| CN110864010A (en) * | 2019-12-10 | 2020-03-06 | 珠海格力电器股份有限公司 | Novel volute tongue structure, fan volute and fan |
-
2014
- 2014-08-22 CN CN201420479666.5U patent/CN203978927U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104196761A (en) * | 2014-08-22 | 2014-12-10 | 广东海信家电有限公司 | Double-air-inlet centrifugal fan |
| CN104632666A (en) * | 2015-02-05 | 2015-05-20 | 镇江市丹徒区粮机厂有限公司 | High-power TLGF-HY-55-II material air blower |
| CN110864010A (en) * | 2019-12-10 | 2020-03-06 | 珠海格力电器股份有限公司 | Novel volute tongue structure, fan volute and fan |
| WO2021114739A1 (en) * | 2019-12-10 | 2021-06-17 | 珠海格力电器股份有限公司 | Novel volute tongue structure, fan volute, and fan |
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