CN215979984U - Centrifugal ventilator - Google Patents
Centrifugal ventilator Download PDFInfo
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- CN215979984U CN215979984U CN202120278228.2U CN202120278228U CN215979984U CN 215979984 U CN215979984 U CN 215979984U CN 202120278228 U CN202120278228 U CN 202120278228U CN 215979984 U CN215979984 U CN 215979984U
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Abstract
The utility model relates to a centrifugal ventilator which comprises an air inlet and an impeller, wherein the impeller comprises a front disc, a rear disc and a plurality of blades uniformly clamped between the front disc and the rear disc, the air inlet is matched with an impeller sleeve, the tail end of the air inlet extends into the front disc, the front edge of each blade sequentially comprises a flow guide section and a fixed section from the inner diameter to the outer diameter of each blade, the fixed section is connected with the inner side of the front disc, the flow guide section extends into the air inlet from the inner side of the front disc, and the flow guide section is not in contact with the air inlet. The utility model further optimizes the gas flowing state at the impeller inlet by adding a protruding part on the outer diameter part of the front end of the inner edge of the blade and enabling the protruding part to extend into the air inlet cavity, so as to improve the efficiency of the impeller acting on the gas and further improve the pneumatic performance and efficiency of the impeller and the ventilator.
Description
Technical Field
The utility model relates to the technical field of ventilators, in particular to a backward centrifugal ventilator.
Background
The impeller of the backward centrifugal ventilator is a rotating part and mainly comprises a back disk, a front disk and a plurality of blades arranged between the back disk and the front disk, wherein an inner hole of the front disk is an impeller inlet; the air inlet is a static part and is in a horn shape, and the air inlet is used for guiding air into the impeller. The air inlet of the backward centrifugal ventilator is matched with the impeller in a sleeving way, namely the tail end of the air inlet extends into the front end of the impeller, and an axial distance T is formed between the tail end of the air inlet and the front end of the bladex(as shown in fig. 1).
Along the axial direction, the smallest diameter position of the air inlet is the throat part (the diameter is phi D)h)。
The vicinity of the region K in fig. 1 is a region where the air flow is relatively complicated, and includes the following factors:
(1) internal leakage and volume loss:
because a certain gap T exists between the air inlet of the backward centrifugal fan and the inlet of the front disk of the impelleryThe leakage loss caused by the clearance is called volume loss, and the volume flow rate of the leakage is Qx(m3/s)：
Qx＝2.318*D0*Ty*Pt 1/2
Wherein D is0Is the inner diameter of the front disk of the impeller, TyIs a radial clearance, PtIs the full pressure value.
The leakage flow not only does useless work, but also interferes the airflow flowing out from the air inlet and entering the periphery of the front end of the blade, and the flowing state is deteriorated.
(2) At the inlet of the centrifugal impeller, the main gas flow, when entering the impeller, turns from axial to radial, this 90 ° turn causing separation and thus pressure loss.
Due to the comprehensive influence, the airflow near the inner diameter of the front disc at the inner side of the impeller is usually uneven, airflow separation is easily generated, and the flow field in the impeller is further deteriorated, so that the efficiency of the impeller acting on the gas is influenced, the pressure of the ventilator is reduced, the power consumption is increased, and the optimization of the gas flowing condition at the position has positive significance.
SUMMERY OF THE UTILITY MODEL
On the basis of matching the air inlet of the backward centrifugal ventilator and the impeller sleeve opening which are widely applied at present, the utility model further optimizes the gas flowing state at the inlet of the impeller by additionally arranging a convex part at the outer diameter part of the front end of the inner edge of the blade and enabling the convex part to extend into the cavity of the air inlet so as to improve the efficiency of the impeller to do work on the gas and further improve the pneumatic performance and efficiency of the impeller and the ventilator.
The utility model realizes the purpose through the following technical scheme:
the utility model provides a centrifugal fan, includes air intake, impeller, the impeller includes that front bezel, back plate and even clamp are established a plurality of blades between front bezel and the back plate, the air intake with the cooperation of impeller cover mouth, the end of air intake stretches into inside the impeller, the edge of blade includes inner edge, outer fringe, leading edge and trailing edge, the canned paragraph of leading edge with the inboard of front bezel is connected, the trailing edge with the inboard of back plate is connected, the inner edge forms the import of air current runner, the outer fringe forms the export of air current runner.
From the internal diameter of blade to the external diameter direction, the blade leading edge is the arc form, and the pitch arc includes water conservancy diversion section and canned paragraph in proper order, the canned paragraph with the head is inboard to be connected, the water conservancy diversion section is followed the head is inboard to be extended to inside the air intake, the water conservancy diversion section with the air intake contactless.
Further, the maximum axial height from the front end of the blade to the inner side plane of the rear disc is bsThe axial height from the throat part of the air inlet to the inner side plane of the rear disc is bhAnd b iss＜bh。
Further, the axial height from the starting point of the fixed segment to the rear disc is b1，bs>b1。
Further, the guide section comprises a smooth arc line section 'cdef', and the width of the blade is gradually increased from the point 'c' to the front end of the blade.
Further, the arc line "cd" is a smooth arc line protruding toward the center of the impeller.
Further, the arc line def is a smooth arc line protruding towards the air inlet.
Compared with the prior art, the utility model has the following beneficial effects:
because the air intake exit end outside is close to clearance vortex region, the interference of leaking the air current in the clearance is easily received to its near main air current, and the blade part of this application stretches into inside the air intake, can carry out initiative guide and do work to peripheral main air current in advance, therefore weakens the interference degree of leaking the air current in the clearance to main air current to reduce this vortex and the loss of pressure that leads to and improve impeller acting capacity, and then improve ventilation blower pressure and aerodynamic efficiency, reduce impeller entry vortex noise.
Drawings
FIG. 1 is a schematic view of an air inlet and an impeller of a centrifugal fan assembled together;
FIG. 2 is a schematic view of the assembly of the air inlet and the impeller of the centrifugal fan of the present invention;
FIG. 3 is a cross-sectional view of the impeller of the present invention;
FIG. 4 is a static pressure comparison graph of a first embodiment of the present invention and a first comparative sample;
FIG. 5 is a graph comparing the static pressure efficiency of the first embodiment of the present invention with that of the first comparative sample;
FIG. 6 is a static pressure comparison graph of example two of the present invention and comparative sample two;
FIG. 7 is a graph comparing the static pressure efficiency of example two of the present invention with that of comparative sample two.
The reference numerals are explained below:
1. an impeller; 2. an air inlet; 11. a blade; 12. a rear disc; 13. and a front disc.
Detailed Description
Example one
The utility model will be further described with reference to the accompanying drawings in which:
a centrifugal ventilator comprises an air inlet 2 and an impeller 1, wherein the air inlet is matched with an impeller sleeve opening, the tail end of the air inlet extends into a front disc, the impeller is a rotating part, the air inlet is a static part, gas is guided into the impeller through the air inlet along with the high-speed rotation of the impeller, the impeller comprises a front disc 13, a rear disc 12 and a plurality of blades 11 uniformly clamped between the front disc and the rear disc, the edges of the blades comprise an inner edge, an outer edge, a front edge and a rear edge, a fixed section of the front edge is connected with the inner side of the front disc, the rear edge is connected with the inner side of the rear disc, the inner edges of adjacent blades in the impeller form an inlet of an airflow channel, the outer edges of the adjacent blades form an outlet of the airflow channel, the front edge of the blades sequentially comprises a flow guide section and a fixed section from the inner diameter direction of the blades to the outer diameter of the blades, the fixed section is connected with the inner side of the front disc, and the flow guide section extends from the inner side of the front disc to the inner side of the air inlet, the guide section is not in contact with the air inlet and the front disc.
In the impeller of the ventilator, airflow enters the impeller from the air inlet, needs to turn 90 degrees and then enters the flow channel between the blades, so that the airflow at the inlet of the flow channel has non-uniformity, and the airflow distribution speed from the inner side of the air inlet to the inner side of the front disc is obviously different along the axial direction.
The structure of the impeller and the air inlet of the ventilator is improved, the state of the air flow at the inlet of the impeller can be effectively improved, and the loss caused by leakage at the matching part of the sleeve opening between the air inlet and the impeller is reduced. In the prior art, the air inlet and the impeller are improved in structure to improve the air flow condition. The inner edge of the blade in the prior art is as shown by an oblique line 'ch' in fig. 3, extends from the inner side of the front disc to the inner side of the rear disc, and the blade is completely clamped between the front disc and the rear disc.
In this embodiment, as shown in fig. 2, the flow guiding section extends toward the air inlet from the point "c" as a starting point, and the front end is the point "e". The point "e" is in the cavity of the air inlet. The arc line "cd" (except the point "c") is not in contact with the air inlet and the front disk. The fixed section is 'ac', and the width of the blade is gradually increased from the point 'c' to the point 'e' at the front end of the blade. The arc "efgh" is the inner edge of the blade, and "def" may be a circular arc or any smooth arc. Similarly, arc "cd" may be a smooth arc or any smooth arc. It is only necessary to satisfy that the arc line def is in the cavity of the air inlet.
Further, the inlet width of the vane (i.e., the axial height from the "c" point of the stationary section to the rear disk) is b1The maximum axial height from the front end of the blade to the inner side plane of the rear disc is bsThe axial height from the throat part of the air inlet to the inner side plane of the rear disc is bhSatisfy bh>bs>b1. That is to say, the guide section begins to extend to one side of the air inlet from the fixed section, and a part of the guide section enters the cavity of the air inlet, and when viewed in the axial direction, the front end of the guide section does not exceed the throat of the air inlet, and mainly guides and applies work to the gas behind the throat of the air inlet. Because the throat part of the air inlet is the area with the smallest airflow flow area, if the flow guide section extends to the throat part, the airflow resistance of the throat part can be further improved. After the airflow flows out of the throat part, obvious vortex flow is caused due to the rapid increase of the flow area. The arrangement of the flow guide section can actively guide and apply work to the airflow, and reduce the eddy at the position.
Example one
Compared with the first comparative sample machine, the front edge of the blade of the first embodiment comprises the fixed section and the flow guide section, the front edge of the blade of the first comparative sample machine only comprises the fixed section and does not comprise the flow guide section, other sizes of the impeller and other parts of the ventilator of the first embodiment and the first comparative sample machine are completely the same, and the matched motor and the running rotating speed are also the same.
The relevant dimensions for example one and comparative prototype one are as follows:
D21＝263.3mm，D22＝244.4mm，D11＝174.6mm，D12＝159mm
b1＝95.4mm，bs＝114mm，bh＝118mm
the performance curves of the example I and the comparative sample I are compared and shown in FIGS. 4-5; the comparison of the performance parameters of the working points with the same air volume is shown in the table 1.
TABLE 1
| Rotating speed (r/min) | Air volume (m)3/h) | Static pressure (Pa) | Static pressure efficiency (%) | |
| |
3700 | 1995 | 920 | 66.5 |
| Example one | 3700 | 1995 | 955 | 68.4 |
Under the working condition of the same air quantity, the static pressure of the first embodiment is improved by 35Pa and the static pressure efficiency is improved by 1.9 percent compared with that of the first comparative sample machine.
Example two
Compared with a comparative sample machine two, the two blade front edges of the embodiment comprise a fixed section and a flow guide section, the two blade front edges of the comparative sample machine only comprise the fixed section and do not comprise the flow guide section, other sizes of impellers and other parts of a ventilator of the embodiment two and the comparative sample machine two are completely the same, and a matched motor and running rotating speed are also the same.
The relevant dimensions for example two and comparative prototype two are as follows:
D21＝526.6mm，D22＝488.6mm，D11＝360mm，D12＝318.2mm
b1＝189.1mm，bs＝206mm，bh＝210.3mm
the performance curves of example two and comparative sample two are compared and shown in FIGS. 6-7; the comparison of performance parameters of the same air volume working condition points is shown in Table 2.
TABLE 2
| Rotating speed (r/min) | Air volume (m)3/h) | Static pressure (Pa) | Static pressure efficiency (%) | |
| |
1780 | 8640 | 727 | 69.6 |
| Example two | 1780 | 8640 | 767.4 | 72.4 |
Under the working condition of the same air volume, the static pressure of the second embodiment is improved by 40.4Pa and the static pressure efficiency is improved by 2.8 percent compared with that of the second comparative sample machine.
And (4) conclusion:
the improved scheme of the utility model is mainly characterized in that under the condition that the main sizes of the impeller, the air inlet and the ventilator are not changed, the outer diameter of the front end of the inner edge of the blade extends into the cavity of the air inlet through the optimization and the expansion of the arc shape of the inner edge of the blade, so that a brand-new matching relation between the impeller and the air inlet is formed. The blades do work on the airflow in advance, the interference of internal leakage on the main airflow is weakened to a certain extent, and the flow state of the front ends of the blades in the impeller is improved, so that the efficiency of the impeller on the work of the gas is improved, the performance and efficiency of the ventilator are obviously improved, the energy consumption and noise are reduced, and the impeller has positive significance.
Claims (6)
1. The utility model provides a centrifugal fan, includes air intake, impeller, the impeller includes that front bezel, back plate and even clamp are established a plurality of blades between front bezel and the back plate, the air intake with the cooperation of impeller overlap, the end of air intake stretches into inside the impeller, the edge of blade includes inner edge, outer fringe, leading edge and trailing edge, the leading edge with the inboard of front bezel is connected, the trailing edge with the inboard of back plate is connected, the inner edge forms airflow channel's import, the outer fringe forms airflow channel's export, its characterized in that, from the internal diameter to the external diameter direction of blade, the blade leading edge includes water conservancy diversion section and canned paragraph in proper order, canned paragraph with the front bezel is inboard to be connected, the water conservancy diversion section is followed the front bezel inboard extends to inside the air intake, the water conservancy diversion section with the air intake contactless.
2. A centrifugal fan according to claim 1, wherein the maximum axial height of the vane front end to the inner side plane of the rear disk is bsThe axial height from the throat part of the air inlet to the inner side plane of the rear disc is bh，bh>bs。
3. A centrifugal fan according to claim 2, wherein the axial height from the start of the fixing section to the rear disk is b1，bs>b1。
4. A centrifugal fan according to claim 1 wherein the flow guiding section comprises a smooth curved section "cdef" with increasing vane width from point "c" to the vane leading end.
5. A centrifugal ventilator according to claim 4 in which the arc "cd" is a smooth arc convex towards the centre of the impeller.
6. A centrifugal fan according to claim 4, wherein the arc "def" is a smooth arc projecting towards the inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120278228.2U CN215979984U (en) | 2021-02-01 | 2021-02-01 | Centrifugal ventilator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120278228.2U CN215979984U (en) | 2021-02-01 | 2021-02-01 | Centrifugal ventilator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215979984U true CN215979984U (en) | 2022-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120278228.2U Active CN215979984U (en) | 2021-02-01 | 2021-02-01 | Centrifugal ventilator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215979984U (en) |
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2021
- 2021-02-01 CN CN202120278228.2U patent/CN215979984U/en active Active
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