CN216812286U - Air inlet and backward centrifugal ventilator thereof - Google Patents
Air inlet and backward centrifugal ventilator thereof Download PDFInfo
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- CN216812286U CN216812286U CN202122721460.1U CN202122721460U CN216812286U CN 216812286 U CN216812286 U CN 216812286U CN 202122721460 U CN202122721460 U CN 202122721460U CN 216812286 U CN216812286 U CN 216812286U
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Abstract
The utility model discloses an air inlet and a backward centrifugal ventilator thereof, which comprises an impeller and an air inlet, wherein the air inlet is in a conical arc hollow cylinder shape comprising an inlet contraction section abc and an outlet expansion section cd, the contraction section abc consists of two sections of arc ab and bc, the section arc line of the outlet expansion section cd is in a quarter ellipse, the utility model keeps the existing air inlet contraction section abc arc line unchanged, changes the existing air inlet cd arc section into the quarter ellipse section cd, and does not change the positions of the two points c and d, after the utility model improves the section arc line of the cd into the quarter ellipse, compared with the air inlet of an original comparison model, the utility model can improve the air flow guide efficiency of the air inlet of the low-pressure backward centrifugal ventilator to the air flow, reduce the flow loss of the inlet incoming flow, and does not change the radial gap and the relative position between the air inlet and the impeller, thereby keeping the appearance and the installation size of the ventilator unchanged, the material and processing technique of the air inlet are the same as those of the comparison model machine, and the implementation is simple and easy.
Description
Technical Field
The utility model belongs to the technical field related to centrifugal ventilators, and particularly relates to an air inlet and a backward centrifugal ventilator thereof.
Background
The volute-free backward centrifugal ventilator mainly comprises an impeller and an inlet current collector (namely an air inlet), wherein the air inlet is used as an important part of the centrifugal ventilator and is a static flow guide part which has the function of smoothly guiding axial air inflow into the impeller, and the air inlet of the conventional centrifugal ventilator has a cylindrical shape, a conical shape, an arc shape and a conical arc shape. For a low-pressure backward centrifugal ventilator, an air inlet of the low-pressure backward centrifugal ventilator is mostly in a conical arc shape, the conical arc-shaped air inlet consists of an inlet contraction section and an outlet expansion section, namely, an airflow in the air inlet is in a flow process of firstly accelerating and then decelerating along the direction of a central axis, and in the process, flow loss is bound to exist, so that the structural form of the air inlet, particularly the shape of a generatrix of a cylindrical body of the air inlet directly influences the flow stability of the air before entering an impeller and the flow condition inside the ventilator.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an air inlet and a backward centrifugal fan thereof, so as to further improve the existing centrifugal fan in the background technology, namely further reduce the flow loss of air flow in the process of accelerating and then decelerating along the central axis direction in the air inlet, optimize the flow state of the air flow before entering an impeller and improve the aerodynamic performance of the fan.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides an air intake, the air intake is for the hollow barrel form of conical arc including entry shrink section abc and export expansion section cd, the cross-section pitch arc of export expansion section cd is quarter ellipse.
Preferably, the smallest diameter at the point c on the air inlet is the throat of the air inlet, the point a is the air inlet of the air inlet, and the point d is the outlet end part of the air inlet.
The utility model provides a backward centrifugal fan, its includes impeller and foretell air intake, the impeller includes the back dish and sets up a plurality of blades between back dish and front bezel, the air intake install in the impeller front end-with the cooperation of impeller front bezel inner circle cover mouth.
The long axis of an ellipse in which a quarter elliptical section cd of an arc line of the section of an outlet section of the air inlet is parallel to the direction of a main shaft of an impeller, the short axis of the ellipse in which the quarter elliptical section cd is positioned is vertical to the direction of the main shaft of the impeller, the focus of the ellipse surrounded by the quarter elliptical section cd is an O point, and the focus O and the minimum diameter part (throat part) of the air inlet are on the same vertical straight line.
Preferably, the diameter of the air inlet is phi Din, the diameter of the throat part of the air inlet is phi Dh, and the diameter of the outlet of the air inlet is phi Dout.
Preferably, the axial distance from the air inlet of the air inlet to the throat part is Ls, the axial distance from the throat part to the outer end part of the outlet is Lk, the length of Lk is equal to Od, and the sum of the lengths of Ls and Lk is equal to the transverse width L of the air inlet.
Preferably, the major axis TA of the ellipse surrounded by the quarter-ellipse segment cd is 2 × Lk, and the minor axis TB of the ellipse surrounded by the quarter-ellipse segment cd is Dout-Dh.
Compared with the prior centrifugal ventilator technology, the utility model provides an air inlet and a backward centrifugal ventilator thereof, which have the following beneficial effects:
firstly, the utility model keeps the arc line of the existing air inlet contraction section abc unchanged, changes the existing air inlet cd arc section into a quarter ellipse section cd, and the positions of the two points c and d are not changed, after the utility model improves the section arc line of the cd into a quarter ellipse, compared with the air inlet of an original comparison prototype, the radial clearance between the air inlet and an impeller is not changed, and the relative positions of the air inlet and the impeller are not changed, so that the appearance and the installation size of the whole ventilator are kept unchanged, and the material and the processing technology of the air inlet are consistent with those of the comparison prototype, therefore, the utility model is simple and easy to implement;
second, after the section arc cd of the air inlet outlet section of the utility model is improved to be a quarter ellipse, compared with a comparison prototype, the utility model has the advantages that the static pressure and the static pressure efficiency are obviously improved under the working condition of the highest efficiency, and the maximum air quantity is also obviously increased.
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 and not to limit the utility model in any way:
FIG. 1 is a schematic view of a backward centrifugal fan according to the present invention;
FIG. 2 is an enlarged schematic view of the structure A of the present invention;
fig. 3 is a schematic view of a conical arc-shaped air inlet according to the present invention;
FIG. 4 is an enlarged structural diagram of B according to the present invention;
FIG. 5 is a schematic structural diagram of a conventional conical arc-shaped air inlet (including a straight conical section);
FIG. 6 is a schematic structural diagram of a conventional conical arc-shaped air inlet (both are arc-shaped sections);
FIG. 7 is a schematic diagram showing a static pressure comparison curve of a first example and a first comparative sample according to the present invention;
FIG. 8 is a graph showing a comparison of the static pressure efficiency of a first example of the present invention and a first comparative sample;
FIG. 9 is a schematic diagram showing a static pressure comparison curve of a second example and a second comparative sample;
FIG. 10 is a graph showing the comparison of the static pressure efficiency of the second embodiment of the present invention and the second comparative sample;
FIG. 11 is a schematic diagram showing a static pressure comparison curve of example three and a comparison sample three;
FIG. 12 is a graph showing the comparison of the static pressure efficiency of example three and comparative sample three.
In the figure: 1. an impeller; 101. 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: the utility model provides a backward centrifugal ventilator, which comprises an impeller 1 and an air inlet provided by the utility model, wherein the impeller 1 comprises a rear disc 101 and a plurality of blades arranged between the rear disc 101 and a front disc, and an air inlet 2 is arranged at the front end of the impeller 1 and is matched with an inner ring sleeve opening of the front disc of the impeller 1.
Specifically, the air inlet 2 is in the shape of a conical arc hollow cylinder comprising an inlet contraction section abc and an outlet expansion section cd, the section arc of the outlet expansion section cd is in a quarter ellipse, the contraction section abc consists of two sections of circular arc ab and bc, the diameter of the circular arc ab is R1, the diameter of the circular arc ab is R2, the diameter of the c point on the air inlet 2 is the smallest and is the throat part of the air inlet 2, the a point is an air inlet of the air inlet 2, and the d point is the outlet tail end part of the air inlet 2. The major axis of the ellipse of the quarter ellipse section cd of the section arc line of the outlet section of the air inlet 2 is parallel to the direction of the major axis of the impeller 1, the minor axis of the ellipse of the quarter ellipse section cd is perpendicular to the direction of the major axis of the impeller 1, the focus of the ellipse surrounded by the quarter ellipse section cd is a point O, the distance from the focus O to the central line of the ellipse is Dout/2, the focus O and the minimum diameter position (throat) of the air inlet 2 are on the same vertical straight line, the diameter of the air inlet 2 is Phi Din, the diameter of the throat is Phi Dh, and the diameter of the outlet is Phi Dout. The axial distance from the air inlet of the air inlet 2 to the throat part is Ls, the axial distance from the throat part to the outer end part of the outlet is Lk, the length of Lk is equal to Od, and the sum of the lengths of Ls and Lk is equal to the transverse width L of the air inlet 2. The major axis length TA of the ellipse surrounded by the quarter-ellipse section cd is 2 × Lk, and the minor axis length TB of the ellipse surrounded by the quarter-ellipse section cd is Dout-Dh.
Please refer to fig. 6, which is a structure diagram of an air inlet of an original comparison prototype according to the present invention, wherein the air inlet is composed of a front-end contraction section abc and a rear-end expansion section cd, wherein the abc is composed of two circular arc-shaped sections ab (diameter R1) and bc (diameter R2), cd is also circular arc-shaped (diameter R3), and the diameter at the c point is the smallest and is the throat of the air inlet. The diameter of the air inlet is phi Din, the diameter of the throat part is phi Dh, and the diameter of the outlet is phi Dout.
Comparing fig. 4 and fig. 6, in the embodiment of the present invention, the arc line of the contraction section abc is kept unchanged, the arc line section of the existing air inlet cd is changed into a quarter ellipse section cd, and the positions of the two points c and d are not changed, after the cross-section arc line of the outlet section cd on the air inlet 2 of the present invention is improved into a quarter ellipse, compared with the air inlet of the original comparison prototype, the radial gap Δ between the air inlet 2 and the impeller 1 is not changed, and the relative position between the air inlet 2 and the impeller 1 is also not changed, so that the overall shape and the installation size of the ventilator are both kept unchanged.
The section of the high-efficiency conical arc-shaped air inlet 2 of the backward centrifugal fan is in a nozzle shape, the front section is a contraction section with gradually reduced area, the air flow is in an acceleration shape in the contraction section, and enters the rear section after passing through the throat part of the air inlet 2, the area of the air flow is continuously enlarged, and the air flow enters the impeller 1 after the speed of the air flow is gradually reduced. After the cross section shape of the outlet section of the air inlet 2 is improved to be a quarter ellipse, compared with the arc shape, the curvature of the large ellipse part is larger, the curvature of the small circle part is smaller, namely, the airflow is gently reduced at the early stage of speed reduction, and the speed reduction is accelerated at the position close to the tail end, so that the flow guide efficiency (flow loss is reduced) of the air inlet 2 can be improved, and the aerodynamic performance parameters and the aerodynamic efficiency of the ventilator are improved.
The performance of the ventilator in 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, second and third examples and the comparison samples I, II and III 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.
The comparison of the maximum air volume of the three examples of the utility model and the comparative prototype thereof is shown in the following table.
As can be seen from the table above, the three embodiments of the present patent have obvious improvement in the maximum air volume with the same impeller 1 diameter compared with the comparative sample machine.
As can be seen from the comparison graphs of the two tables and the performance curves of FIGS. 7-12, the three embodiments of the present invention have obviously improved static pressure and static pressure efficiency and obviously increased maximum air volume under the highest efficiency working condition compared with the comparison prototype; the performance curves of the three improved embodiments are all at the upper right of the original comparison model machine, which proves that the output and the efficiency of the ventilator are obviously improved, and the improvement effect is particularly obvious within the range of the middle large flow interval.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The air inlet is characterized in that the air inlet (2) is in a conical arc hollow cylinder shape comprising an inlet contraction section abc and an outlet expansion section cd, and the section arc line of the outlet expansion section cd is in a quarter ellipse shape; wherein the diameter of the air inlet (2) is phi Din, the diameter of the throat part is phi Dh, and the diameter of the outlet is phi Dout.
2. An air inlet according to claim 1, characterized in that: the diameter of the c point on the air inlet (2) is the smallest and is the throat part of the air inlet (2), the a point is the air inlet of the air inlet (2), and the d point is the outlet terminal part of the air inlet (2).
3. A wind inlet according to claim 1 or 2, wherein: the major axis of the ellipse of the quarter ellipse section cd of the section arc line of the outlet section is parallel to the direction of the main axis of the impeller (1), the minor axis of the ellipse of the quarter ellipse section cd is vertical to the direction of the main axis of the impeller (1), the focus of the ellipse surrounded by the quarter ellipse section cd is an O point, and the focus O and the minimum diameter of the air inlet (2) are on the same vertical straight line.
4. A backward centrifugal fan, its characterized in that: the air inlet comprises an impeller (1) and the air inlet as claimed in any one of claims 1 and 2, wherein the impeller (1) comprises a rear disc (101) and a plurality of blades arranged between the rear disc (101) and a front disc, and the air inlet (2) is arranged at the front end of the impeller (1) and is matched with an inner ring sleeve opening of the front disc of the impeller (1).
5. A backward centrifugal fan according to claim 4, wherein: the axial distance from the air inlet of the air inlet (2) to the throat is Ls, the axial distance from the throat to the outer end of the outlet is Lk, the length of Lk is equal to Od, and the sum of the lengths of Ls and Lk is equal to the transverse width L of the air inlet (2).
6. A backward centrifugal fan according to claim 5, wherein: the major axis TA of the ellipse surrounded by the quarter elliptical segment cd is 2 × Lk, and the minor axis TB of the ellipse surrounded by the quarter elliptical segment cd is Dout-Dh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122721460.1U CN216812286U (en) | 2021-11-09 | 2021-11-09 | Air inlet and backward centrifugal ventilator thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122721460.1U CN216812286U (en) | 2021-11-09 | 2021-11-09 | Air inlet and backward centrifugal ventilator thereof |
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| CN216812286U true CN216812286U (en) | 2022-06-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264599A (en) * | 2022-08-04 | 2022-11-01 | 珠海格力电器股份有限公司 | Guiding device, fan and air conditioner |
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2021
- 2021-11-09 CN CN202122721460.1U patent/CN216812286U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264599A (en) * | 2022-08-04 | 2022-11-01 | 珠海格力电器股份有限公司 | Guiding device, fan and air conditioner |
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