CN219639120U - Ternary impeller for centrifugal fan - Google Patents
Ternary impeller for centrifugal fan Download PDFInfo
- Publication number
- CN219639120U CN219639120U CN202320656276.XU CN202320656276U CN219639120U CN 219639120 U CN219639120 U CN 219639120U CN 202320656276 U CN202320656276 U CN 202320656276U CN 219639120 U CN219639120 U CN 219639120U
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- impeller
- ring section
- cambered surface
- ternary
- blade
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- 238000000926 separation method Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008676 import Effects 0.000 abstract 2
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A ternary impeller for centrifugal fan, including the front disc, back disc and a plurality of ternary blade, set up the centre bore that is used for supplying wheel hub and main shaft to be connected on the back disc, a plurality of ternary blade are evenly spaced apart along the circumference of centre bore, the back disc is a circular flat board, the front disc comprises flat board ring section and cambered surface ring section, flat board ring section and back disc are parallel to each other, the external diameter of flat board ring section equals with the external diameter of back disc, the big end and the inner circle edge connection of flat board ring section of cambered surface ring section, the tip of cambered surface ring section is located the flat board ring section and keeps away from one side of back disc, the inlet opening has been seted up to the tip of cambered surface ring section, the molded lines of cambered surface ring section have adopted the idea of water section to set for rather than a slash and directly link to each other with the impeller import for the shape of cambered surface ring section suits with the overall dimension of impeller, and revise the axial width of impeller, avoid the air current to produce the flow separation by the axial when changeing radially in the front disc department, the drastic change of speed of air current at the import has been weakened.
Description
Technical Field
The utility model relates to the field of centrifugal fans, in particular to a ternary impeller for a centrifugal fan.
Background
The impeller is the main acting element of the centrifugal fan, and the efficient impeller is the development direction of the ventilator. The existing centrifugal fan mainly comprises a binary straight-plate blade impeller, when the impeller is projected from an impeller inlet to the rear disk direction of the impeller, the molded line of the impeller blade is a curve, and the radial speed C of air flow 1r The average radial velocity along the entire axial length of the blade inlet, i.e. the radial velocity from the front disc (shroud) to the rear disc (disk), is considered to be of uniform equivalence; obviously, this does not correspond to the actual flow field, resulting in a relatively low efficiency of the thin plate type blade fan.
In order to better fit an actual flow field and improve efficiency, the three-dimensional flow is widely used on a compressor impeller, and is characterized in that in the actual flow, all airflow parameters are variable functions in three directions on a space coordinate system, and the blades are three-dimensional curved surfaces with space distortion. However, the rear disk of the compressor wheel is conical-arc-shaped (large curvature of the rotation surface), and the rear disk of the centrifugal fan wheel is flat, so that the ternary impeller of the compressor cannot be directly used on the centrifugal fan. In the prior art, a ternary impeller which converts a binary arc blade into a variable curvature curve element ternary blade already exists, but the existing impeller front disc molded line is a diagonal line and is directly connected with an impeller inlet, so that the airflow is seriously separated to form a large-area vortex when the airflow is radially rotated from an axial direction, and the phenomenon that the speed of the airflow is severely changed at a front disc still exists, so that the working efficiency of the impeller is seriously influenced.
Disclosure of Invention
The utility model provides a solution to the problem.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a ternary impeller for centrifugal fan, including the front disc, the back dish and a plurality of ternary blade, front disc and back dish set up relatively, ternary blade width direction's both sides are connected with front disc and back dish respectively, install wheel hub on the back dish, set up the centre bore that is used for supplying wheel hub and spindle connection on the back dish, a plurality of ternary blade follow the circumference evenly spaced distribution of centre bore, the back dish is a circular flat board, the front disc comprises flat ring section and cambered surface ring section, flat ring section and back dish are parallel to each other, the external diameter of flat ring section equals with the external diameter of back dish, the main aspects of cambered surface ring section and the inner circle marginal connection of flat ring section, the tip of cambered surface ring section is located one side that the back dish was kept away from to flat ring section, the inlet opening has been seted up to the tip of cambered surface ring section, cambered surface ring section's molded lines satisfy:
；
in the formula (1), Q is the flow of a fan; c (C) r Is radial velocity; r is the radius of the impeller;is the axial width of the impeller; k is a correction coefficient of blade thickness blockage;
；
in the formula (2), t is the thickness of the blade; n is the number of blades; beta j Is the blade angle.
Preferably, the windward side of the ternary blade is twisted 5-10 ° toward the rotation direction of the impeller, and the leeward side of the ternary blade is twisted 1-10 ° toward the rotation reverse direction of the impeller.
According to the technical scheme, the utility model has the beneficial effects that:
in the ternary impeller, the rear disc is of a flat plate structure, the front disc is of a composite structure formed by a flat plate ring section and an arc surface ring section, the molded line of the front disc is set by adopting the idea of the water cross section, and the inclined line is not directly connected with the impeller inlet in the prior art, so that the shape of the arc surface ring section is adapted to the integral size of the impeller, the axial width of the impeller is corrected, the flow separation at the front disc when the air flow changes from the axial direction to the radial direction is avoided, and the drastic change of the speed of the air flow at the inlet is weakened.
Drawings
FIG. 1 is a cross-sectional view of an impeller;
fig. 2 is a left side view of fig. 1.
The marks in the figure: 1. front disc, 2, ternary blade, 3, wheel hub, 4, back disc, 5, the fresh air inlet, 6, dull and stereotyped ring section, 7, cambered surface ring section.
Detailed Description
Referring to the drawings, the specific embodiments are as follows:
as shown in fig. 1, a ternary impeller for a centrifugal fan comprises a front disc 1, a rear disc 4 and a plurality of ternary blades 2, wherein the front disc 1 and the rear disc 4 are oppositely arranged, two sides of the ternary blades 2 in the width direction are respectively connected with the front disc 1 and the rear disc 4, a hub 3 is arranged on the rear disc 4, a central hole for connecting the hub 3 with a main shaft is formed in the rear disc 4, and the ternary blades 2 are uniformly distributed at intervals along the circumferential direction of the central hole.
In this embodiment, the windward side of the ternary blade 2 is twisted by 5 to 10 ° toward the rotation direction of the impeller, the leeward side of the ternary blade 2 is twisted by 1 to 10 ° toward the rotation reverse direction of the impeller, and the number of ternary blades 2 is 16.
As shown in fig. 2, the back plate 4 is a circular flat plate, the front plate 1 is composed of a flat plate ring section 6 and an arc surface ring section 7, the flat plate ring section 6 and the back plate 4 are parallel to each other, the outer diameter of the flat plate ring section 6 is equal to that of the back plate 4, the large end of the arc surface ring section 7 is connected with the edge of the inner ring of the flat plate ring section 6, the small end of the arc surface ring section 7 is located at one side of the flat plate ring section 6 far away from the back plate 4, and the small end of the arc surface ring section 7 is provided with an air inlet hole 5.
The molded line of the cambered surface ring section 7 meets the following conditions:
；
in the formula (1), Q is the flow of a fan; c (C) r Is radial velocity; r is the radius of the impeller;is the axial width of the impeller; k is a correction factor for blade thickness blockage.
；
In the formula (2), t is the thickness of the blade; n is the number of blades; beta j Is the blade angle.
The molded line of the front disc adopts the idea of the water cross section to set, and is not directly connected with the impeller inlet by an oblique line, so that the shape of the cambered surface ring section is adapted to the integral size of the impeller, the axial width of the impeller is corrected, the flow separation at the front disc is avoided when the air flow is rotated radially from the axial direction, and the severe change of the speed of the air flow at the inlet is weakened.
Claims (2)
1. A ternary impeller for a centrifugal fan, characterized by: including front disc (1), back dish (4) and a plurality of ternary blade (2), front disc (1) and back dish (4) set up relatively, ternary blade (2) width direction's both sides are connected with front disc (1) and back dish (4) respectively, install wheel hub (3) on back dish (4), set up the centre bore that is used for supplying wheel hub (3) to be connected with the main shaft on back dish (4), a plurality of ternary blade (2) follow the circumference evenly spaced distribution of centre bore, back dish (4) are a circular flat board, front disc (1) are by dull and stereotyped ring segment (6) and cambered surface ring segment (7) are constituteed, dull and stereotyped ring segment (6) and back dish (4) are parallel to each other, the external diameter of dull and stereotyped ring segment (6) equals with the external diameter of back dish (4), the main aspects of cambered surface ring segment (7) are connected with the inner circle edge of dull and stereotyped ring segment (6), the tip of cambered surface ring segment (7) is located one side that back dish (4) is kept away from to dull and stereotyped ring segment (7), cambered surface ring segment (7) tip (5) have been seted up to cambered surface ring segment (7), the inlet opening (5) is satisfied.
；
In the formula (1), Q is the flow of a fan; c (C) r Is radial velocity; r is the radius of the impeller;is the axial width of the impeller; k is a correction coefficient of blade thickness blockage;
；
in the formula (2), t is the thickness of the blade; n is the number of blades; beta j Is the blade angle.
2. A three-way impeller for a centrifugal fan according to claim 1, wherein: the windward side of the ternary blade (2) is twisted by 5-10 degrees towards the rotation direction of the impeller, and the leeward side of the ternary blade (2) is twisted by 1-10 degrees towards the rotation opposite direction of the impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320656276.XU CN219639120U (en) | 2023-03-29 | 2023-03-29 | Ternary impeller for centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320656276.XU CN219639120U (en) | 2023-03-29 | 2023-03-29 | Ternary impeller for centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219639120U true CN219639120U (en) | 2023-09-05 |
Family
ID=87821001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320656276.XU Active CN219639120U (en) | 2023-03-29 | 2023-03-29 | Ternary impeller for centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219639120U (en) |
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2023
- 2023-03-29 CN CN202320656276.XU patent/CN219639120U/en active Active
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