CN110848157B - Multilayer centrifugal impeller and fan using same - Google Patents
Multilayer centrifugal impeller and fan using same Download PDFInfo
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- CN110848157B CN110848157B CN201911143072.0A CN201911143072A CN110848157B CN 110848157 B CN110848157 B CN 110848157B CN 201911143072 A CN201911143072 A CN 201911143072A CN 110848157 B CN110848157 B CN 110848157B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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Abstract
The invention discloses a multilayer centrifugal impeller which comprises an impeller cover, an impeller disc, a plurality of first blades uniformly distributed at equal angles, a plurality of middle discs and a plurality of second blades, wherein the plurality of middle discs are arranged at intervals in the direction from the impeller cover to the impeller disc, the number of the middle discs is N, the plurality of middle discs divide the multilayer centrifugal impeller into N +1 layers along the axial direction, the 1 st layer, the … … th layer, the Nth layer and the N +1 th layer are sequentially arranged in the direction from the impeller cover to the impeller disc, the plurality of second blades are arranged in the plurality of layers from the 1 st layer to the N +1 th layer, and included angles are formed between the second blades and the first blades. The multilayer centrifugal impeller is provided with the second blades, and the second blades improve the air flow speed at the air outlet, so that the vortex and separation phenomena generated in the flowing interior of the impeller are eliminated as much as possible, the noise is reduced, and the efficiency of the fan is improved; and the second blade is a double-support simply-supported beam structure, so that the multilayer centrifugal impeller is stable in structure, and the running reliability of the fan is improved.
Description
Technical Field
The invention relates to the technical field of fans, in particular to a multilayer centrifugal impeller and a fan using the same.
Background
The fan is an indispensable important component in the ventilation system, and at present, the backward does not have spiral case centrifugal impeller because do not have the spiral case and lead to the efficiency ratio of fan lower, and current centrifugal impeller is single-layer structure more, and the distribution of air outlet amount of wind is uneven, and the vortex phenomenon still appears in centrifugal impeller's air outlet department easily, seriously influences the efficiency of fan.
The prior art has certain defects although the problems are solved. For example, CN201720330819.3 discloses a double-layer fan impeller with balanced air volume, which comprises a hub, a rear cover plate, blades, a front cover plate and a middle partition plate, wherein the rear cover plate is driven to rotate by the blades, the blades are fixed on the rear cover plate, and the rear cover plate of the blades rotates together; the front cover plate is fixed on the top ends of the blades, the middle partition plate is fixed between the front cover plate and the rear cover plate, and the front cover plate and the middle partition plate are used for cutting gas entering the fan into two parts and then respectively forming two layers of air ducts and guiding the air ducts to the air outlet. Although this double-deck formula fan wheel makes the air outlet amount of wind distribute evenly, has slowed down the vortex phenomenon, has improved fan efficiency, but the effect of improvement is not enough yet, and the median septum is cut apart into two parts, does not have the branch of primary and secondary part, and the part that is close to air outlet department does not have and sets up other blade and handle the flow field, and the vortex is mainly concentrated in air outlet department and produces, weakens the vortex effect not good.
Summary of the invention
In order to solve the above technical problems, an object of the present invention is to provide a multi-layer centrifugal impeller, which includes a shroud, a wheel disc, a middle disc, a first blade and a second blade, and the multi-layer centrifugal impeller has the advantages of reducing the strength of a vortex, reducing operation noise, improving the efficiency of a fan, ensuring uniform and smooth airflow, having a stable structure, and improving the operation reliability of the fan.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a multilayer centrifugal impeller comprises a wheel cover, a wheel disc and a plurality of first blades which are uniformly distributed at equal angles and arranged between the wheel cover and the wheel disc, and is characterized by further comprising a plurality of middle discs and a plurality of second blades, wherein the middle discs are arranged at intervals in the direction from the wheel cover to the wheel disc, the number of the middle discs is N, N is a positive integer which is greater than or equal to 1, the multilayer centrifugal impeller is divided into N +1 layers by the N middle discs in the axial direction, and the layers from the wheel cover to the wheel disc are sequentially a layer 1, a layer … …, an N layer and an N +1 layer; a plurality of the second blade sets up 1 st floor to among a plurality of layers on the (N + 1) th floor, the second blade with be the contained angle setting between the first blade, just the second blade with the contained angle between the first blade is less than 90.
Preferably, the number of the first blades is n1, n1 is more than or equal to 3, the number of the second blades in each layer is n2, n2 is more than or equal to n1, the second blades in each layer are uniformly distributed along the circumferential direction of the central disc at equal angles, and through the arrangement, the flow field generated by the second blades can change the non-uniform condition of the flow field near the air outlet of the multilayer centrifugal impeller, namely the effect of weakening the strength of the vortex is achieved.
Preferably, the first blades comprise first suction surfaces and first pressure surfaces arranged opposite to the first suction surfaces, and the second blades positioned between two adjacent first blades are close to the adjacent first suction surfaces, so that the vortex of the multilayer centrifugal impeller positioned at the air outlet is mainly generated by the first suction surfaces of the first blades, and the second blades are close to the adjacent first suction surfaces, so that the flow field generated by the second blades can more specifically change the condition of uneven flow of the flow field of the first suction surfaces, namely, the effect of weakening the strength of the vortex can be more effectively improved.
Preferably, the second blade includes a second suction surface and a second pressure surface opposite to the second suction surface, an outer edge point of the first blade along the radial direction of the wheel disc is a first outer edge point, an outer edge point of the second blade along the radial direction of the wheel disc is a second outer edge point, and an included angle between a tangent line of the first outer edge point along the first suction surface and a tangent line of the second outer edge point along the second suction surface adjacent to the first outer edge point is less than or equal to 0.7 × 360 °/n1Through setting up like this, do not influence under the prerequisite of multilayer centrifugal impeller air output, further improve again and weaken vortex intensity effect.
Preferably, the wheel cover is provided with a through hole as an air inlet, a gap between the wheel cover and the wheel disc is an air outlet, the vertical distance between the wheel cover and the wheel disc at the air outlet is an outlet height H1, the height of each layer of the second blades is H2, H2 is more than or equal to 0.2 XH 1 and less than or equal to 0.6 XH 1, and through the arrangement, if H2 is more than or equal to 0.6 XH 1, namely the height of the second blades is too large, the height of the (N + 1) th layer is relatively reduced, and the air output of the multilayer centrifugal impeller is reduced; h2 is less than or equal to 0.2 XH 1, namely the height of the second blade is too small, the effect of the second blade on weakening the vortex intensity is reduced; and H2 is more than or equal to 0.2 XH 1 and less than or equal to 0.6 XH 1, on the premise of not influencing the air output of the multilayer centrifugal impeller, the effect of weakening the vortex intensity is improved as much as possible.
Preferably, when 0.2 XH 1 ≦ H2 ≦ 0.5 XH 1, N ≦ H1 ÷ H2| -1; 0.5 × H1< H2, N is 1. Through the arrangement, the cantilever beam structure of the second blade can be converted into a double-support simple beam structure by the N middle discs, and the strength of the first blade is enhanced by the N middle discs, so that the structure of the multilayer centrifugal impeller is more stable; and the N central discs can divide the air outlet of the multilayer centrifugal impeller into N +1 layers of runners, the airflow flow of each layer of runner is not interfered with each other, so that the airflow flow is uniform and smooth, the plurality of central discs are added to enable the airflow to flow in layers on the premise of not influencing the air outlet quantity of the multilayer centrifugal impeller, the layers are not interfered with each other, and the airflow flow is uniform and smooth.
Preferably, the inner diameter of the plurality of middle discs is the diameter of an inlet of the middle disc, the diameter of the inlet of the middle disc is D2, the inner diameter of the wheel cover is the diameter of an inlet of the wheel cover, the diameter of the inlet of the wheel cover is D1, and D2 is larger than or equal to D1.
Preferably, an inner edge point of the second vane in the radial direction of the wheel disc is a second inner edge point, and a distance between the second inner edge point and the center of the wheel disc is greater than or equal to half of the inlet diameter of the wheel cover. By this arrangement, the second inner edge point of the second blade does not protrude inward with respect to the shroud inlet, and thus does not affect the intake air amount of the multi-stage centrifugal impeller.
Preferably, the chord lengths of the second blades of the plurality of layers decrease gradually layer by layer from the wheel cover to the wheel disc, and by such an arrangement, because the strength of the airflow flow is uneven, that is, the strength of the vortex decreases gradually from the wheel cover to the wheel disc, and the chord lengths of the second blades decrease gradually layer by layer from the wheel cover to the wheel disc, on one hand, the material of the second blades is saved and the weight of the multilayer centrifugal impeller is reduced under the condition that the strength of the vortex is ensured to be weakened; on the other hand, the shorter the chord length of the second blade, the smaller the weight of the second blade, and the smaller the centrifugal force of the second blade, thereby greatly reducing the centrifugal force of the second blade, and making the structure of the second blade more stable.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the flow field generated by the first blade mainly has the conditions of slow flow, non-uniform flow, even separation and the like at the air outlet of the multilayer centrifugal impeller, namely, the vortex and separation phenomena are easily generated at the air outlet, the multilayer centrifugal impeller is provided with N middle discs from the wheel cover to the wheel disc, the second blade is arranged in a plurality of layers from the 1 st layer to the N +1 th layer, the flow field generated by the second blade can improve the phenomenon that the flow field at the air outlet has slow flow and non-uniform flow, the vortex strength can be weakened as much as possible, the operation noise is reduced, and the efficiency of the fan is improved; and the N central pans can divide the multilayer centrifugal impeller into N +1 layers of runners along the axial direction, and airflow flowing between the N +1 layers of runners is not interfered with each other, so that airflow flowing is more uniform and smooth.
2. Because a plurality of layers from the 1 st layer to the (N + 1) th layer are provided with the second blades, namely, the two ends of the second blades along the axial direction are respectively connected with the end surface of the middle disc or the end surfaces of the wheel cover and the middle disc or the end surfaces of the wheel disc and the middle disc, the cantilever beam structure of the second blades is converted into a double-support simple beam structure, and the strength of the first blades is enhanced by the N middle discs, so that the structural stability of the multilayer centrifugal impeller is good, and the safety and the reliability of the operation of the fan are improved.
The invention also provides a fan, which comprises the multilayer centrifugal impeller, so that the fan has all the beneficial effects of the multilayer centrifugal impeller, and the details are not repeated herein.
Drawings
FIG. 1 is an isometric schematic view of an embodiment of the invention;
FIG. 2 is a schematic front view of an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 4 is a schematic bottom view of an embodiment of the present invention;
FIG. 5 is a schematic top view of an embodiment of the present invention;
FIG. 6 is a schematic diagram of a portion of an embodiment of the present invention;
fig. 7 is a schematic front view of an embodiment of the invention.
Wherein, the technical characteristics that each reference numeral refers to are as follows:
1. a wheel cover; 2. a wheel disc; 3. a first blade; 3.1, a first suction surface; 3.2, a first pressure surface; 4. a middle disc; 5. a second blade; 5.1, a second suction surface; 5.2, a second pressure surface; h1, exit height between wheel cover and wheel disc; h2, height of second blade; d2, center plate inlet diameter; d1, impeller inlet diameter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.
Example 1:
referring to fig. 1-6, this embodiment discloses a multilayer centrifugal impeller, which includes a wheel cover 1, a wheel disc 2, a plurality of middle discs 4, a plurality of first blades 3 and a plurality of second blades 5, wherein the first blades 3 are blades of a conventional centrifugal impeller, the second blades are short blades, the plurality of first blades 3 are disposed between the wheel cover 1 and the wheel disc 2, and the plurality of first blades 3 are uniformly arranged at equal angles along the circumferential direction of the wheel cover 1, a gap between the wheel cover 1 and the wheel disc 2 is an air outlet of the multilayer centrifugal impeller, a through hole is formed in the wheel cover 1 and is an air inlet of the multilayer centrifugal impeller, the plurality of middle discs 4 are disposed at intervals from the wheel cover 1 to the wheel disc 2, the number of the middle discs 4 is N, N is a positive integer greater than or equal to 1, the N middle discs 4 divide the air inlet of the multilayer centrifugal impeller into N +1 layers along the axial direction, i.e., into N +1 layers of flow channels, the air flows in the N +1, make the air current flow of multilayer centrifugal impeller air outlet department more even smooth and easy, from the direction of wheel lid 1 to rim plate 2, be 1 st layer, … …, nth layer and N +1 th layer in proper order, a plurality of second blades 5 set up among a plurality of layers on 1 st layer to N +1 th layer, are the contained angle setting between second blade 5 and the first blade 4, and the contained angle between second blade 5 and the first blade 4 is less than 90.
Because the flow field generated by the first blade 3 mainly has the phenomena of slow, uneven and even separation of airflow at the air outlet of the multilayer centrifugal impeller, namely, vortex and separation phenomena are easy to generate at the air outlet, the multilayer centrifugal impeller is provided with N middle discs 4 arranged at intervals from the wheel cover 1 to the wheel disc 2, the N middle discs 4 divide the air outlet of the multilayer centrifugal impeller into N +1 layers along the axial direction, the second blades 5 are arranged in the layers from the layer 1 to the layer N +1, the flow field generated by the second blades 5 can improve the phenomenon that the flow field at the air outlet flows slowly and unevenly, the strength of the vortex can be weakened as much as possible, the running noise is reduced, the efficiency of the fan is improved, and N well dish 4 divides into N +1 layer runners with the multilayer centrifugal impeller, and the air current flow between the N +1 layer runner is mutual noninterference for the air current flows more evenly smoothly.
The number of the first blades 3 is n1, n1 is greater than or equal to 3, the number of the second blades 5 is n2, n2 is greater than or equal to n1, the second blades 5 on each layer are uniformly distributed along the circumferential direction of the middle disc 4 at equal angles, specifically, in the embodiment, n2 is n1 is 5, namely, the first blades 3 and the second blades 5 are uniformly distributed along the circumferential direction at equal angles of 72 degrees, and a second blade 5 is arranged between every two adjacent first blades 3, so that the flow field generated by the second blades 5 can change the condition that the flow field at the air outlet of the multi-layer centrifugal impeller flows slowly and unevenly, namely, the vortex intensity is weakened.
The first blades 3 comprise first suction surfaces 3.1 and first pressure surfaces 3.2, the first suction surfaces 3.1 and the second pressure surfaces 5.2 are oppositely arranged, the second blades 5 positioned between the two adjacent first blades 3 are close to the first suction surfaces 3.1, the vortex of the multilayer centrifugal impeller positioned at the air outlet is mainly generated by the first suction surfaces 3.1 of the first blades 3, and the second blades 5 are close to the adjacent first suction surfaces 3.1, so that the flow field generated by the second blades 5 can more pertinently change the condition that the flow field of the first suction surfaces 3.1 is uneven, namely the effect of the vortex intensity is more effectively weakened.
The second blade 5 also comprises a second suction surface 5.1 and a second pressure surface 5.2, the second suction surface 5.1 and the second pressure surface 5.2 are oppositely arranged, and the radial outer edge point of the first blade 3 along the wheel disc 2 is a first outer edge pointThe outer edge point of the second blade 5 along the radial direction of the wheel disc 2 is a second outer edge point, and the included angle theta between the tangent line of the first outer edge point along the first suction surface 3.1 and the tangent line of the second outer edge point along the second suction surface 5.1 or the included angle between the tangent line of the first outer edge point along the first pressure surface 3.1 and the tangent line of the second outer edge point along the second pressure surface 5.2 is less than or equal to 0.7 multiplied by 360 degrees/n1Specifically, an included angle theta between a tangent line of the first outer edge point along the first suction surface 3.1 and a tangent line of the second outer edge point along the second suction surface 5.1 is equal to 50.4 degrees, so that the condition of uneven flow of a flow field in the multilayer centrifugal impeller can be improved on the premise of not influencing the air output of the multilayer centrifugal impeller, and the effect of weakening the vortex intensity is improved.
The vertical distance between the wheel cover 1 and the wheel disc 2 at the air outlet is an inlet height H1, the height of the second blade 5 is H2, the H2 is equal to the axial distance between the wheel cover 1 and the middle disc 4 adjacent to the wheel cover 1 at the air outlet or the axial distance between the two adjacent middle discs 4 at the air outlet or the axial distance between the wheel disc 2 and the middle disc 4 adjacent to the wheel disc 2 at the air outlet, and H2 is more than or equal to 0.2 multiplied by H1 and less than or equal to 0.6 multiplied by H1, if H2 is more than or equal to 0.6 multiplied by H1, namely the height of the second blade 5 is too large, the height of the (N + 1) th layer is relatively reduced, and the air output of the multilayer centrifugal impeller is reduced; h2 is less than or equal to 0.2 XH 1, namely the height of the second blade 5 is too small, the effect of weakening the vortex intensity is reduced; in this embodiment, H2 is 0.2 × H1, so that the effect of weakening the vortex strength is improved as much as possible without affecting the air output of the multi-layer centrifugal impeller.
When H2 is more than or equal to 0.2 XH 1 and less than or equal to 0.5 XH 1, N is more than or equal to | H1 ÷ H2| -1; when H2 is > 0.5 × H1, N is 1. The N middle discs 4 can convert the cantilever beam structure of the second blade 5 into a double-support simple beam structure, and the strength of the first blade is enhanced by the N middle discs, so that the structure of the multilayer centrifugal impeller is more stable; and the air inlet of the multilayer centrifugal impeller is divided into N +1 layers of runners by the N middle discs, the airflow flowing of each layer of runner is not interfered with each other, so that the airflow flows uniformly and smoothly, the plurality of middle discs 4 are added to enable the airflow to flow in layers on the premise of not influencing the air output of the multilayer centrifugal impeller, the layers are not interfered with each other, and the airflow flows uniformly and smoothly. In this embodiment, because the size of the multilayer centrifugal impeller is not large, the number N of the middle discs 4 is 1, that is, one middle disc 4 is arranged between the wheel cover 1 and the wheel disc 2, and the distance between the middle disc 4 and the wheel cover 1 in the axial direction between the air outlets is 0.2 times the distance between the wheel cover 1 and the wheel disc 2 in the axial direction between the air outlets, and the air inlet of the multilayer centrifugal impeller is divided into two layers of flow channels by the middle disc 4, that is, an upper flow channel and a lower flow channel; the second blade 5 is arranged between the central disc 4 and the wheel cover 1, namely, two ends of the second blade 5 along the axial direction are respectively connected with the wheel cover 1 and the end surface of the central disc 4.
The inner diameter of the middle disc 4 is the inlet diameter of the middle disc 4, the inlet diameter of the middle disc is D2, the inner diameter of the wheel cover 1 is the inlet diameter of the wheel cover, the inlet diameter of the wheel cover is D1, D2 is not less than D1, namely, the inner diameter of the middle disc 4 is not less than the inner diameter of the wheel cover 1, on the premise of not influencing the effect of weakening vortex, the air intake of the multilayer centrifugal impeller is improved as much as possible, and specifically, D1 is not less than D2 in the embodiment.
The radial inner edge point of the second blade 5 along the wheel disc 2 is a second inner edge point, the distance between the second inner edge point and the center of the wheel disc 2 is greater than or equal to half of the diameter of the wheel cover inlet, namely, the second inner edge point of the second blade 5 does not protrude inwards relative to the wheel cover inlet, so that the air intake of the multilayer centrifugal impeller is not influenced.
The application process of the embodiment of the invention comprises the following steps:
in the use process, the multilayer centrifugal impeller is installed on a fan, the outer side of the wheel disc 2 is connected to a motor of the fan, the motor drives the multilayer centrifugal impeller to integrally rotate, when the fan is started, the multilayer centrifugal impeller integrally rotates anticlockwise from the direction of figure 5, surrounding air enters the multilayer centrifugal impeller from an air inlet of the wheel cover 1 and applies work to the air through the pressure surfaces of the blades, the air flows out from an air outlet between the wheel cover 1 and the wheel disc 2 after applying work, generally, airflow generated by the first suction surface 3.1 of the first blade 3 can generate the condition that a flow field flows slowly, unevenly or even separates at the air outlet, because the multilayer centrifugal impeller is provided with the layer of the second blade 5, the second suction surface 5.1 of the second blade 5 applies work to the air, and the applied air flows out from the air outlet between the wheel cover 1 and the wheel disc 2, namely the air outlet of an upper flow channel, the second blades 5 improve the speed of the airflow at the corresponding air outlet, reduce or even eliminate the eddy phenomenon at the air outlet, improve the efficiency of the fan and reduce the noise of operation; and the center 4 in this embodiment turns into the cantilever beam structure of second blade 5 to the simple beam structure of dual bracing, has also improved the intensity of first blade 3 moreover to improve the overall structure's of multilayer centrifugal impeller stability, and then improved the safety and stability of fan operation.
Example 2:
this embodiment describes only the differences from embodiment 1, and the remaining technical features are the same as embodiment 1. In this embodiment, referring to fig. 7, the multilayer centrifugal impeller includes four middle discs 4, the four middle discs 4 are arranged at intervals from the wheel cover 1 to the wheel disc 2, the four middle discs 4 divide the air outlet of the multilayer centrifugal impeller into the 1 st layer, the 2 nd layer, the 3 rd layer, the 4 th layer and the 5 th layer along the axial direction, and the 1 st layer is not equal to the 5 th layer in height, three second blades 5 are arranged in the 1 st layer and the 3 rd layer, the second blades 5 in the 1 st layer and the 3 rd layer are uniformly arranged along the circumferential direction of the middle disc at equal angles, and the 1 st layer and the second blades 5 in the 3 rd layer are not overlapped, so that the vortex in the flow channel of the multilayer centrifugal impeller can be weakened in a targeted manner, the air outlet state of the multilayer centrifugal impeller is changed, and the aerodynamic noise of the multilayer centrifugal impeller is reduced.
The chord lengths of the plurality of layers of second blades 5 are gradually reduced from the wheel cover 1 to the wheel disc 2 in layers, and the chord length of the second blade 5 is the connecting line distance between two end points of the second blade 5 in the radial direction of the central disc 4, specifically, in the embodiment, the chord length of the second blade 5 on the 1 st layer is longer than that of the second blade 5 on the 3 rd layer, and due to the uneven strength of the airflow, namely the strength of the vortex is gradually reduced from the wheel cover 1 to the wheel disc 2, and the chord length of the second blade 5 is gradually reduced from the wheel cover 1 to the wheel disc 2 in layers, under the condition that the strength of the vortex is ensured to be reduced, on one hand, the material of the second blade 5 is saved, and the weight of the multilayer centrifugal impeller is reduced; on the other hand, the shorter the chord length of the second blade 5, the smaller the weight of the second blade 5, and the smaller the centrifugal force of the second blade 5, thereby greatly reducing the centrifugal force of the second blade 5, so that the structure of the second blade 5 is more stable.
The invention further provides a fan which comprises the multilayer centrifugal impeller, and the fan has all beneficial effects due to the fact that the fan comprises the multilayer centrifugal impeller, and the fan is not repeated.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (6)
1. A multilayer centrifugal impeller comprises a wheel cover, a wheel disc and a plurality of first blades which are uniformly distributed at equal angles and arranged between the wheel cover and the wheel disc, and is characterized by further comprising a plurality of middle discs and a plurality of second blades, wherein the middle discs are arranged at intervals in the direction from the wheel cover to the wheel disc, the number of the middle discs is N, N is a positive integer greater than 1, the multilayer centrifugal impeller is divided into N +1 layers by the N middle discs in the axial direction, and the 1 st layer, … …, the Nth layer and the N +1 th layer are sequentially arranged in the direction from the wheel cover to the wheel disc; the second blades are arranged in the layers from the layer 1 to the layer (N + 1), the layer 1 is not overlapped with the second blades in the layer 3, an included angle is formed between the second blades and the first blades, and the included angle between the second blades and the first blades is smaller than 90 degrees;
the number of the first blades is
And is and
the number of the second blades of each layer is
And is and
the second blades on each layer are uniformly distributed along the circumferential direction of the middle disc at equal angles;
the first blade comprises a first suction surface and a first pressure surface opposite to the first suction surface, the second blade between the two adjacent first blades is close to the adjacent first suction surface, the second blade comprises a second suction surface and a second pressure surface opposite to the second suction surface, the first blade is along the radial outer edge point of the wheel disc as a first outer edge point, the second blade is along the radial outer edge point of the wheel disc as a second outer edge point, the first outer edge point is along the tangent line of the first suction surface and the adjacent second outer edge point is along the tangent line of the second suction surface, and the included angle between the tangent line of the second suction surface and the tangent line of the first suction surface is smaller than or equal to the included angle between the tangent line of the second suction surface and the adjacent second outer edge point
；
And the chord lengths of the second blades of the plurality of layers are sequentially decreased from the wheel cover to the wheel disc layer by layer.
2. The impeller of claim 1, wherein the shroud has a through hole as an air inlet, the gap between the shroud and the disk is an air outlet, the vertical distance between the shroud and the disk at the air outlet is an outlet height H1, the height of each layer of the second blades is H2, and
。
3. the impeller of claim 2, wherein the impeller is a multi-stage impeller
。
4. The impeller of claim 2, wherein the inner diameter of the plurality of center plates is a center plate inlet diameter, the center plate inlet diameter is D2, the inner diameter of the shroud is a shroud inlet diameter, the shroud inlet diameter is D1, and
。
5. the impeller of claim 2, wherein the inner edge point of the second vane in the radial direction of the disk is a second inner edge point, and the distance between the second inner edge point and the center of the disk is greater than or equal to half the inlet diameter of the shroud.
6. A fan comprising a multilayer centrifugal impeller according to any one of claims 1 to 5.
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| CN111486114B (en) * | 2020-04-15 | 2021-06-11 | 浙江上风高科专风实业有限公司 | Design method and design system of impeller with streamline curvature center disk |
| CN111550439B (en) * | 2020-06-17 | 2024-05-28 | 浙江科贸智能机电股份有限公司 | Impeller of backward centrifugal ventilator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| ITRE20050060A1 (en) * | 2005-05-26 | 2006-11-27 | Emak Spa | PORTABLE ASPIRATOR FOR CLEANING WORKS |
| JP2007154702A (en) * | 2005-12-02 | 2007-06-21 | Fujitsu General Ltd | Turbo fan and air conditioner using the same |
| CN203879799U (en) * | 2014-05-30 | 2014-10-15 | 江苏友奥电器有限公司 | Double-suction centrifugal fan blade |
| CN106855055A (en) * | 2015-12-09 | 2017-06-16 | 苏州三星电子有限公司 | Two stage centrifugal fan, blower fan and air-conditioner |
| CN108457897B (en) * | 2018-04-09 | 2024-07-05 | 广东美的制冷设备有限公司 | Centrifugal wind wheel and air conditioner indoor unit |
| CN109026830B (en) * | 2018-08-16 | 2021-02-12 | 泛仕达机电股份有限公司 | Centrifugal impeller |
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