CN216691590U - Backward centrifugal impeller and backward centrifugal ventilator comprising same - Google Patents
Backward centrifugal impeller and backward centrifugal ventilator comprising same Download PDFInfo
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- CN216691590U CN216691590U CN202122536990.9U CN202122536990U CN216691590U CN 216691590 U CN216691590 U CN 216691590U CN 202122536990 U CN202122536990 U CN 202122536990U CN 216691590 U CN216691590 U CN 216691590U
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Abstract
The utility model discloses a backward centrifugal impeller and a backward centrifugal ventilator comprising the same. The utility model improves the structure aiming at the matching relation of the impeller and the sleeve opening of the air inlet of the backward centrifugal ventilator, adds an arc-shaped flange section at the inner ring of the front disk of the impeller so as to reduce the internal leakage loss and improve the flow and the pneumatic efficiency of the outlet of the impeller, thereby improving the output of the ventilator, saving energy and reducing consumption, simultaneously increasing the rigidity of the inlet ring of the impeller and improving the operation reliability of the ventilator, and the overall dimension of the ventilator is not increased when the arc-shaped flange section is added, thereby having positive significance.
Description
Technical Field
The utility model relates to the technical field of ventilators, in particular to a backward centrifugal impeller with an additional flange section at a front disc inlet and a backward centrifugal ventilator thereof.
Background
The impeller is centrifugal fan's essential element, is mostly closed impeller, mainly includes back plate, preceding dish and sets up a plurality of blades between them. Usually, a sleeve opening matching mode that a part of the outlet end of the air inlet is inserted into the impeller is adopted between the impeller and the air inlet of the backward centrifugal fan, as shown in fig. 1 and 2. When the impeller and the air inlet of the backward centrifugal fan are matched by adopting a sleeve opening, a radial gap is inevitably formed between the impeller which is a part rotating around the driving shaft and the air inlet which is a static flow guide part, namely the inner diameter of the front disc inlet of the impeller is larger than the outer diameter of the outlet of the air inlet. When the centrifugal ventilator operates, relatively speaking, the gas pressure at the center of the inside of the impeller is negative pressure, and after the impeller applies work to the gas, the pressure after the gas flows out of the impeller is positive pressure, so that a part of the gas flows into the inside of the impeller through a radial gap between the impeller and the air inlet under the action of pressure difference, which is a phenomenon of leakage in the backward centrifugal ventilator. The existence of internal leakage causes the flow rate at the outlet of the impeller to be reduced and a part of useless work is done, namely internal leakage loss is formed.
SUMMERY OF THE UTILITY MODEL
The present invention has been made in an effort to solve the above-mentioned problems occurring in the background art, and an object of the present invention is to provide a backward centrifugal impeller and a backward centrifugal fan including the same.
In order to achieve the purpose, the utility model provides the following technical scheme: the backward centrifugal impeller comprises a rear disc, a front disc and a plurality of blades arranged between the rear disc and the front disc, wherein an arc-shaped flange section is arranged on an inner ring at the front end of the front disc.
Preferably, the arc-shaped flange section attached to the inner ring of the front disc comprises a flange plane section ab, an arc-shaped contraction section bc and a straight cylinder section cd, the flange plane section ab is an annular plane perpendicular to the axis of the impeller, the straight cylinder section cd is in a cylinder shape with the center line coincident with the axis of the impeller, and the cross section of the arc-shaped contraction section bc along the axial direction is in an arc line shape, and the convex surface of the arc-shaped contraction section is inward.
Preferably, the length of the straight barrel section cd is greater than 0.012 times the blade outer diameter.
Preferably, the cross-sectional shape of the arcuate constricted section bc in the axial direction is a circular arc, an elliptical shape, or another curved shape.
The utility model also provides a backward centrifugal fan which comprises the backward centrifugal impeller.
Preferably, the ventilator is further provided with an air inlet inserted into the front end of the front disc to form a sleeve opening matched with the front end of the front disc, and the radial clearance between the outer diameter of the outlet end of the air inlet and the inner diameter of the front disc is smaller than 0.01 time of the outer diameter of the blade.
Preferably, the outlet end of the air inlet is located within the length range of the straight cylinder section cd at the axial position.
Compared with the prior art, the utility model provides a backward centrifugal impeller and a backward centrifugal ventilator comprising the same, and the backward centrifugal impeller and the backward centrifugal ventilator have the following beneficial effects:
(1) on the basis of the existing backward centrifugal ventilator impeller, the arc-shaped flange section is arranged at the inner ring of the front disc of the impeller, so that the internal leakage is weakened to a certain extent, the flow and the pneumatic efficiency of the ventilator impeller outlet are improved, the ventilator output is improved, and energy conservation and consumption reduction are realized.
(2) In addition, the increase of the arc-shaped flange section does not increase the axial size of the centrifugal ventilator, and the rigidity of the inner ring of the front disc is stronger by adding the backward centrifugal impeller after the arc-shaped flange section, so that the deformation can be prevented and the roundness of the inner ring can be ensured; the phenomenon that the inner ring of the front disc is damaged due to fatigue tearing after the ventilator runs for a long time is not easy to occur, the running reliability and the service life of the centrifugal ventilator are improved, the overall dimension of the ventilator is not increased, and the centrifugal ventilator has positive significance.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model without limiting the utility model in which:
FIG. 1 is a schematic cross-sectional view of a backward centrifugal impeller in the prior art;
FIG. 2 is a schematic view of a portion I of FIG. 1;
FIG. 3 is a schematic sectional view of a backward centrifugal impeller according to the present invention;
figure 4 is an enlarged partial diagrammatic view of the Π portion of figure 3;
fig. 5 is a schematic view of the external structure of the backward centrifugal impeller of the present invention.
In the figure: 11. a blade; 12. a front plate; 13. a rear disc; 2. and an air inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 3-5, the present embodiment provides a backward centrifugal impeller, which includes a rear disk 13, a front disk 12, and a plurality of blades 11 disposed between the rear disk 13 and the front disk 12, wherein an arc-shaped flange section is disposed at a front end of an inner ring of the front disk 12.
Specifically, the arc-shaped flange section in this embodiment includes flange plane section ab, arc-shaped shrink section bc, straight cylinder section cd, flange plane section ab is the annular plane perpendicular to the impeller axis, straight cylinder section cd is the barrel form of central line and impeller axis coincidence, arc-shaped shrink section bc is the arc line form along axial cross section, and its convex surface is inside, the cross sectional shape is circular-arc, ellipse or other curve shapes, preferably adopt circular-arc in this embodiment, backward centrifugal impeller in this application is applied to centrifugal fan on, when assembling, the exit end of air intake 2 inserts in front disk 12 and forms the cuff cooperation, the exit end of air intake 2 is located the length range of straight cylinder section cd in axial position.
Diameter D of blade 11 in this embodiment2263.3mm, the inner diameter D of the front disc 120176mm, the length of the straight cylinder section cd is more than 0.012 times of the outer diameter of the blade 11, the length of the straight cylinder section cd is 5mm, the radial clearance between the outer diameter of the outlet end of the air inlet 2 and the inner diameter of the front disc 12 is less than 0.01 times of the outer diameter of the blade 11, the radial clearance delta is 2.8mm, and the radius R of the arc-shaped contraction section bc is 10 mm.
Example two
The embodiment provides a backward centrifugal impeller, which comprises a rear disk 13, a front disk 12 and a plurality of blades 11 arranged between the rear disk 13 and the front disk 12, wherein an arc-shaped flange section is arranged at the front end of an inner ring of the front disk 12.
Specifically, the arc-shaped flange section in this embodiment includes a flange plane section ab, an arc-shaped contraction section bc, and a straight cylinder section cd, where the flange plane section ab is an annular plane perpendicular to the axis of the impeller, the straight cylinder section cd is a cylinder whose central line coincides with the axis of the impeller, the arc-shaped contraction section bc is in an arc shape along the axial cross section, and its convex surface is inward, and the cross section is in an arc shape, the backward centrifugal impeller in this application is applied to a centrifugal fan, during assembly, the outlet end of the air inlet 2 is inserted into the front disc 12 to form a looping fit, and the straight outlet end of the air inlet 2 is located within the length range of the cylinder section cd at the axial position.
Diameter D of blade 11 in this embodiment2590mm, inner diameter D of the front plate 120398mm, the length of the straight cylinder section cd is more than 0.012 times of the outer diameter of the blade 11, the length of the straight cylinder section cd is 8mm, the radial clearance between the outer diameter of the outlet end of the air inlet 2 and the inner diameter of the front disc 12 is less than 0.01 times of the outer diameter of the blade 11, the radial clearance delta is 4.7mm, and the arc-shaped section cd is arc-shapedThe radius R of the constriction bc is 15 mm.
The utility model aims at the ventilator comprising the impeller in the first embodiment and the second embodiment, and experimental comparison analysis is respectively carried out on the ventilator and a corresponding prototype, and for the convenience of viewing, the relevant dimensions of the first embodiment, the second embodiment and the comparative prototype I and the second embodiment are as follows:
the performance of the ventilator in the two embodiments of the utility model and the performance of the ventilator in the prior art under the highest efficiency working condition are tested through experiments, and the performances are analyzed and compared. The comparison of the main performance of the maximum efficiency operating points of the first and second examples and the first and second comparative samples is shown in the following table.
As can be seen from the table above, the three embodiments of this patent compare with its comparison model machine, and under the highest efficiency operating mode, static pressure and static pressure efficiency all had obvious promotion.
In addition, through adding the backward centrifugal impeller who establishes behind the arc flange section, its front disk inner circle rigidity is stronger:
(1) the deformation can be prevented, and the roundness of the inner ring of the front disc and the circumferential uniformity of a radial clearance of the air inlet and the matching of the inner ring of the front disc of the impeller can be ensured;
(2) the phenomenon that the inner ring of the front disc is damaged due to fatigue tearing after the ventilator runs for a long time can be prevented, and the running reliability and the service life of the centrifugal ventilator are improved.
After the front disk of the impeller is provided with the arc-shaped flange section, the whole axial size of the centrifugal fan cannot be increased.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. The utility model provides a backward centrifugal impeller, is including after-disc (13), preceding dish (12) and set up a plurality of blades (11) between after-disc (13), preceding dish (12), its characterized in that: the front end of the inner ring of the front disc (12) is provided with an arc-shaped flange section.
2. A backward centrifugal impeller according to claim 1, wherein: the arc-shaped flange section attached to the inner ring of the front disc (12) comprises a flange plane section ab, an arc-shaped contraction section bc and a straight cylinder section cd, wherein the flange plane section ab is an annular plane perpendicular to the axis of the impeller, the straight cylinder section cd is in a cylinder shape with the center line coincident with the axis of the impeller, and the arc-shaped contraction section bc is in an arc-shaped shape along the axial cross section and has an inward convex surface.
3. A backward centrifugal impeller according to claim 2, wherein: the length of the straight cylinder section cd is greater than 0.012 times the outer diameter of the blade (11).
4. A backward centrifugal impeller as claimed in claim 2, wherein: the cross section of the arc-shaped contraction section bc along the axial direction is in a shape of an arc, an ellipse or other curves.
5. A backward centrifugal fan comprising a backward centrifugal impeller according to any one of claims 2, 3 and 4.
6. A backward centrifugal fan according to claim 5, wherein: the ventilator is also provided with an air inlet (2) which is inserted into the front end of the front disc (12) to form a sleeve mouth fit with the front end, and the radial clearance between the outer diameter of the outlet end of the air inlet (2) and the inner diameter of the front disc (12) is smaller than 0.01 time of the outer diameter of the blade (11).
7. A backward centrifugal fan according to claim 5 or 6, wherein: the outlet end of the air inlet (2) is located in the length range of the straight cylinder section cd at the axial position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122536990.9U CN216691590U (en) | 2021-10-21 | 2021-10-21 | Backward centrifugal impeller and backward centrifugal ventilator comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122536990.9U CN216691590U (en) | 2021-10-21 | 2021-10-21 | Backward centrifugal impeller and backward centrifugal ventilator comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216691590U true CN216691590U (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122536990.9U Active CN216691590U (en) | 2021-10-21 | 2021-10-21 | Backward centrifugal impeller and backward centrifugal ventilator comprising same |
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| Country | Link |
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| CN (1) | CN216691590U (en) |
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2021
- 2021-10-21 CN CN202122536990.9U patent/CN216691590U/en active Active
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