CN212297016U - Impeller of backward centrifugal ventilator - Google Patents
Impeller of backward centrifugal ventilator Download PDFInfo
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- CN212297016U CN212297016U CN202021132210.3U CN202021132210U CN212297016U CN 212297016 U CN212297016 U CN 212297016U CN 202021132210 U CN202021132210 U CN 202021132210U CN 212297016 U CN212297016 U CN 212297016U
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- front bezel
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Abstract
The utility model provides a backward centrifugal fan's impeller, includes front bezel, back plate and sets up the arc blade between front bezel and back plate, is provided with a plurality of water conservancy diversion pieces in the front bezel inboard, and the internal diameter of water conservancy diversion piece in the impeller is greater than the external diameter of blade, and the external diameter of water conservancy diversion piece in the impeller is less than the external diameter of front bezel. The utility model discloses a to having the low pressure of no leaf diffuser outside centrifugal fan impeller periphery position, the blade export, the inboard suitable position of front bezel installs the very little local water conservancy diversion piece of a plurality of areas additional, and to wherein gas flow carry out active control and guide and further do work, optimize the flow pattern in the annular space after the blade export, reduce its loss of flow to improve ventilation blower performance and efficiency, improve the ventilation blower promptly and exert oneself and energy saving and consumption reduction.
Description
Technical Field
The utility model relates to a ventilation blower technical field especially relates to a backward centrifugal fan's impeller.
Background
The centrifugal ventilator impeller mainly comprises a rear disc, blades and a front disc, for a long time, research aiming at the centrifugal ventilator impeller mainly focuses on optimization of factors such as blade profiles, geometric parameters, blade numbers and the like, and long-term progress is achieved.
In the early stage, the air flow speed of the tail end of the blade at the outer diameter part of the high-pressure centrifugal fan is higher, so that the proportion of the dynamic pressure of the high-pressure centrifugal fan in the full pressure of the fan is higher, and researchers add a bladeless diffuser (namely a bladeless diffuser) at the outer diameter part of the impeller of the high-pressure centrifugal fan, so that the speed of air leaving the impeller can be reduced, the dynamic pressure proportion in the full pressure of the fan is reduced, and the static pressure proportion in the fan is increased; subsequently, researchers also conducted research comparison on adding a bladeless diffusion section to the low-pressure centrifugal fan impeller and applied to actual products.
The centrifugal fan impeller, under the prerequisite that has the vaneless diffuser, even if the blade design is long and short blade, the fluid passage between the blade is through optimizing, its flow is more reasonable, but in the impeller, the air current leaves the blade outer fringe after to the space in the vaneless diffuser section before the impeller rim plate outer fringe is the annular space of not having the full sky of restraint, the air current of this department also has certain influence to the performance of ventilation blower, in prior art, rarely carry out the characteristic to this place air current and study and optimize to improve the performance of ventilation blower.
SUMMERY OF THE UTILITY MODEL
For the outlet relative width (impeller outlet width b)2And the diameter D of the outlet of the blade2The ratio of the air flow to the impeller is larger than 0.25, and an annular space between the outer diameter of the blade and the outer diameter of the front disc and the outer diameter of the rear disc in the impeller is a bladeless diffusion section.
The utility model discloses a following technical scheme realizes:
the utility model provides a backward centrifugal fan's impeller, is in including preceding dish, after-disc and setting arc blade between preceding dish and the after-disc, the external diameter of preceding dish is greater than the external diameter of blade the preceding dish inboard is provided with a plurality of water conservancy diversion pieces, the internal diameter of water conservancy diversion piece in the impeller is greater than the external diameter of blade the external diameter of water conservancy diversion piece in the impeller is less than the external diameter of preceding dish.
Furthermore, the end points of the outer diameters of the guide blocks are on the same circumference.
Further, the number of the guide blocks is n times of the number of the blades, wherein n is 1, 2 and 3.
Furthermore, the flow guide block is vertically fixed on the inner side of the front disc and is a straight plate with equal thickness.
Further, the thickness of the flow guide block is not less than that of the blade.
Further, the height of the flow guide block is 0.02-0.06 times of the outer diameter of the blade.
Further, the flow guide blockOutlet mounting angle beta ofj2＝(90°-β2A) 10 deg., where beta2AThe blade outlet setting angle is adopted.
The utility model discloses a to having the low pressure of no leaf diffuser outside centrifugal fan impeller periphery position, the blade export, the inboard suitable position of front bezel installs the very little local water conservancy diversion piece of a plurality of areas additional, and to wherein gas flow carry out active control and guide and further do work, optimize the flow pattern in the annular space after the blade export, reduce its loss of flow to improve ventilation blower performance and efficiency, improve the ventilation blower promptly and exert oneself and energy saving and consumption reduction. For the peripheral part of the impeller of the low-pressure centrifugal ventilator with larger outlet width, along the direction of the central line of the main shaft, relative to the inner side of the rear disc, the air flow speed close to the inner side of the front disc is larger, the eddy loss caused by the air flow wake action is also relatively larger after the outlet of the blade, through additionally arranging a plurality of local flow guide blocks on the inner side of the front disc in the bladeless diffusion section outside the outer diameter of the outlet of the blade, the air flow is guided and combed while the air flow on the inner side of the front disc further acts, the eddy effect is weakened to a certain extent, namely, the flow loss is reduced, and further the static pressure ventilator and the static pressure efficiency are improved.
Drawings
FIG. 1 is a front view of a comparative prototype impeller;
FIG. 2 is a left side view of a comparative prototype impeller;
FIG. 3 is a front view of an impeller according to an embodiment;
FIG. 4 is a diagram illustrating the position of a deflector according to an embodiment;
FIG. 5 is a diagram illustrating the position of a second deflector according to an embodiment;
FIG. 6 is a diagram of the position of the three guide blocks of the embodiment;
FIG. 7 is a graph comparing the static pressures of the first and second examples;
FIG. 8 is a graph comparing the static pressure efficiency of the first and comparative samples;
FIG. 9 is a graph showing the comparison of the static pressures of the second embodiment and the comparative sample machine;
FIG. 10 is a graph comparing the static pressure efficiency of the second embodiment with that of the comparative sample machine;
FIG. 11 is a graph showing the comparison of the static pressures of the third embodiment and the comparative sample machine;
FIG. 12 is a graph comparing the static pressure efficiency of the third embodiment with that of the comparative sample.
In the figure, 1 is a rear disk, 2 is a blade, 3 is a front disk, and 4 is a guide block.
Detailed Description
The impeller of the backward centrifugal ventilator comprises a front disc 3, a rear disc 1 and arc-shaped blades 2 arranged between the front disc and the rear disc, wherein in the impeller of the ventilator, the outer diameters of the front disc and the rear disc are larger than the outer diameters of the blades, therefore, an annular space formed between the outer diameter of the blades and the outer diameter of the impeller is a bladeless diffusion section of the impeller, airflow is output from the impeller through the bladeless diffusion section after flowing out of a blade channel, the bladeless diffusion section has a certain radial length, and the airflow in the bladeless diffusion section has a certain improvement space. For the outlet relative width (impeller outlet width b)2And the diameter D of the outlet of the blade2Ratio of) of greater than 0.25, non-uniformity in the velocity of the air flow from the front disk to the rear disk, and significant deviation of the primary air flow at the outlet of the blade passages to the side closer to the front disk, so that the swirl near the inner side of the front disk is greater than that near the inner side of the rear disk, thereby causing cross-talk and friction between the outlet air flows, resulting in flow losses, which in turn reduce the fan outlet pressure and fan aerodynamic efficiency, and additional secondary noise of the outlet air flow.
An impeller of a backward centrifugal fan, the impeller mainly comprises the following dimensions:
D0＝352mm
D1＝318mm
D2＝526mm
D3＝566mm
Dj1＝526mm
Dj2＝550mm
b1＝189mm
b2＝150mm
β2A＝30°
t＝2.5mm
tj＝2.5mm
Z＝7
βj2＝60°
b2/D2＝0.285
Lj＝17.5mm
Lj/D2＝0.033
wherein D is0The inner diameter of the front disk of the impeller D1Is the inner diameter of the blade, D2Is the outer diameter of the blade, D3Is the outer diameter of the front disc, Dj1Is the inner diameter of the guide block in the impeller, Dj2To the outside diameter of the guide block in the impeller, b1Is the impeller inlet width, b2Is the width of the impeller outlet, beta2AIs the blade outlet mounting angle, t is the blade thickness, tjIs the thickness of the flow guide block, Z is the number of blades, betaj2Is an outlet mounting angle of the flow guide block, b2/D2Is the relative width of the outlet, LjIs the height of the flow guide block, Lj/D2Is the relative height of the guide block.
The inventor sets up a plurality of water conservancy diversion pieces 4 on impeller front bezel inboard, through optimizing the quantity, the shape, installation angle etc. of water conservancy diversion piece, plays to dredge and stable effect to the air current.
In this embodiment, the shape, size and installation position of each local flow guide block are the same, and the total number Z of the local flow guide blocksjAnd is an integer multiple of the number of blades Z: zjSpecifically, a plurality of flow guide blocks are uniformly arranged on an outlet channel formed by two adjacent blades and serve as a group of flow guide blocks. Therefore, n is also the number of flow guiding blocks in each group. The phase angle between the two blades is alpha which is 360/Z; the circumferential phase angle beta of the diversion block is 360/Z/(n +1) and alpha/(n + 1).
The flow guide block is vertically and fixedly arranged on the inner side of the front disc and is a block-shaped solid with a certain thickness, and the cross section of the flow guide block can be square, circular or other shapes. The material may be metal, or plastic with certain strength. The guide block is preferably in the shape of an equal-thickness straight plate, the thickness of the guide block is not less than that of the blade, and the guide block is fixed on the bladeless diffusion section, so that the inner diameter of the guide block relative to the center of the impeller is the center of a circle with the center of the impeller as the center of a circleThe outer diameter of the guide block relative to the center of the impeller is smaller than that of the front disc. Because the guide block optimizes the airflow close to the front disc side, the axial height of the guide block has a proper range, the height of the guide block is related to the size of the vortex on the inner side of the front disc, and if the height of the guide block is too large, the main airflow of the impeller is disturbed, so that the energy consumption of the ventilator is increased. Height L of flow guide blockjPreferably (0.015 to 0.075). times.D2(ii) a Wherein D2Is the outer diameter of the blade. Preferably, the height of the guide block is (0.02-0.06) × D2。
Furthermore, the guide blocks are uniformly distributed on the inner side of the front disc of the impeller, the end point of the outer diameter of each guide block is on the same circumference, the guide blocks on the front disc are the same in shape and size, and the installation angles are also the same. The number of the guide blocks is integral multiple of the number of the blades, and is preferably 1 time, 2 times and 3 times of the number of the blades. That is, 1, 2 or 3 diversion blocks are uniformly distributed in an outlet channel formed by two adjacent blades. For example, the number of the flow guide blocks is 3 times of the number of the blades, that is, the number of the flow guide blocks is 3 at the bladeless diffuser at the outlet of the channel formed by two adjacent blades.
Furthermore, the inclination direction of the guide block is consistent with that of the blade, and the outlet installation angle beta of the guide blockj2＝(90°-β2A) 10 deg., where beta2AThe blade outlet setting angle is adopted. Preferably, the outlet mounting angle beta of the flow guide blockj2＝(90°-β2A)±5°。
A ventilator with the above sized impeller, but without a partial flow deflector, was used as a comparative prototype.
Example 1
In the impeller of the embodiment, each group of the guide blocks is 1, and the number of the blades is 7, that is, the inner side of the front disc is uniformly provided with 7 guide blocks, and other sizes and operation rotating speeds are completely the same as those of a comparison sample machine.
Example 2
In the impeller of the embodiment, each group of the impeller is uniformly provided with 2 flow guide blocks, as the number of the blades is 7, 14 flow guide blocks are arranged on the inner side of the front disc, the size, the inner diameter and the outer diameter of the installation and the installation angle of the outlet of the flow guide blocks are completely consistent with those of the embodiment, and other sizes and operation rotating speeds of the impeller are completely the same as those of a comparison sample machine.
Example 3
In the impeller of the embodiment, each group of the impeller is uniformly provided with 3 flow guide blocks, the number of the blades is 7, 21 flow guide blocks are arranged on the inner side of the front disc, the size, the inner diameter and the outer diameter of the installation and the installation angle of the outlet of the flow guide blocks are completely consistent with those of the embodiment, and other sizes and operation rotating speeds of the impeller are completely the same as those of a comparison sample machine.
The same air volume points for the three examples are compared for performance, as shown in table 1 below:
TABLE 1
| Rotating speed (r/min) | Air volume (m)3/h) | Static pressure (Pa) | Static pressure efficiency (%) | |
| Comparison prototype | 1780 | 8352 | 842.8 | 67.1 |
| Example one | 1780 | 8352 | 863.8 | 68.3 |
| Example two | 1780 | 8352 | 872.8 | 68.5 |
| EXAMPLE III | 1780 | 8352 | 880.2 | 68.5 |
The performance curves are compared and respectively seen in: fig. 8-12.
As can be seen from the comparison, the static pressures of the first, second and third examples are respectively improved by 21Pa, 30Pa and 37.4Pa, and the static pressure efficiency is respectively improved by 1.2%, 1.4% and 1.4% compared with the comparative sample.
The inner side of the front disc is provided with the plurality of flow guide blocks, so that the fan is suitable for a fan with the diameter of the impeller being larger than 100mm, and the efficiency of the fan can be effectively improved.
The present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. The utility model provides a backward centrifugal fan's impeller, includes front bezel, back plate and sets up arc blade between front bezel and the back plate, its characterized in that, the external diameter of front bezel is greater than the external diameter of blade the front bezel inboard is provided with a plurality of water conservancy diversion pieces, the internal diameter of water conservancy diversion piece in the impeller is greater than the external diameter of blade the external diameter of water conservancy diversion piece in the impeller is less than the external diameter of front bezel.
2. An impeller for a backward centrifugal fan according to claim 1, wherein the outer diameter of the plurality of flow guide blocks is defined by the same circumference as the end point.
3. The impeller of a backward centrifugal fan according to claim 1, wherein the number of the guide blocks is n times the number of the blades, where n is 1, 2, and 3.
4. The impeller of a backward centrifugal fan as claimed in claim 1, wherein the guide block is vertically fixed inside the front disk, and the guide block is a straight plate having an equal thickness.
5. The impeller of a backward centrifugal ventilator according to claim 1, wherein the thickness of the flow guide block is not less than the thickness of the blade.
6. The impeller of a backward centrifugal fan as claimed in claim 1, wherein the height of the guide block is 0.02 to 0.06 times the outer diameter of the blade.
7. An impeller for a backward centrifugal fan according to claim 1, wherein an outlet installation angle β of the guide blockj2＝(90°-β2A) 10 deg., where beta2AThe blade outlet setting angle is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021132210.3U CN212297016U (en) | 2020-06-17 | 2020-06-17 | Impeller of backward centrifugal ventilator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021132210.3U CN212297016U (en) | 2020-06-17 | 2020-06-17 | Impeller of backward centrifugal ventilator |
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| CN212297016U true CN212297016U (en) | 2021-01-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550439A (en) * | 2020-06-17 | 2020-08-18 | 浙江科贸智能机电股份有限公司 | Impeller of backward centrifugal ventilator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550439A (en) * | 2020-06-17 | 2020-08-18 | 浙江科贸智能机电股份有限公司 | Impeller of backward centrifugal ventilator |
| 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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