CN212055267U - Large arc air inlet structure of centrifugal fan - Google Patents
Large arc air inlet structure of centrifugal fan Download PDFInfo
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- CN212055267U CN212055267U CN201921952162.XU CN201921952162U CN212055267U CN 212055267 U CN212055267 U CN 212055267U CN 201921952162 U CN201921952162 U CN 201921952162U CN 212055267 U CN212055267 U CN 212055267U
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- air inlet
- centrifugal fan
- air intake
- air
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Abstract
The utility model discloses a centrifugal fan orthodrome air intake structure, including an air intake and blade, the air intake links up with the blade, the air intake has great air intake circular arc radius R 'and air intake throat department to the axial distance L' in air intake exit. The utility model discloses a centrifugal fan orthodrome air intake, it can improve the flow of centrifugal fan impeller import, reduces relevant losses such as air current impact in the centrifugal fan impeller runner, improves the purpose of fan efficiency, improves centrifugal fan's variable operating mode performance under the large-traffic. The major arc air inlet is mainly characterized in that: on the basis of the air inlet of the normal centrifugal fan, the axial distance from the throat position to the air inlet is increased, the arc radius of the air inlet is increased, and the non-uniformity of air flow at the inlet of the impeller is reduced. For the large-flow working condition of the centrifugal fan, the fan efficiency is improved more obviously.
Description
Technical Field
The utility model relates to a fan energy-conservation increases technical field, especially relates to a centrifugal fan orthodrome air intake structure.
Background
The centrifugal fan impeller produced by the existing fan enterprises is shown in figure 1, and the circular arc radius R of the air inlet and the position of the throat part of the air inlet areThe axial distance L from the air inlet is smaller. For the conventional fan, the statistics of a plurality of centrifugal fans from 9-19 to 4-72 and the like show that the ratio R/D of the centrifugal fans ish<0.2，L/Dh<0.2. Because the air current needs to turn and enter the impeller, the turning radius R of the conventional centrifugal fan is too small, so that the air current at the inlet of the centrifugal impeller is uneven, the impact angle can be generated in the inlet area of the wheel cover and the wheel disc under the design working condition, the air current impact loss is generated, and the efficiency of the centrifugal fan is reduced. Under variable working conditions, the phenomenon is more obvious.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide a centrifugal fan orthodrome air intake structure, under the prerequisite that does not improve current processing condition and technological level, can improve centrifugal fan high efficiency point efficiency and variable operating mode centrifugal fan's efficiency down.
The technical scheme of the utility model as follows:
a large-arc air inlet structure of a centrifugal fan comprises an air inlet corresponding to the position of an impeller blade, wherein the air inlet is provided with a larger arc radius R 'of the air inlet and an axial distance L' from the throat part of the air inlet to the outlet part of the air inlet.
Further, the arc radius R ' of the air inlet and the axial distance L ' from the throat part to the outlet of the air inlet meet the requirement of R '/Dh＝0.4-1，L’/Dh＝0.4-1。
Furthermore, the throat part of the air inlet is provided with a straight section, so that the stability of air flow after air inlet can be further guaranteed.
Furthermore, the large arc air inlet structure can be applied to the traditional two-element blade centrifugal impeller and the centrifugal impeller with three-element blades.
Further, the binary blade centrifugal impeller comprises backward-bent blades, radial blades and forward-bent blades.
The utility model has the advantages that: by increasing the arc radius of the air inlet, the air inlet of the centrifugal fan reduces the unevenness of air flow at the inlet of the impeller on the premise of not improving the existing processing conditions and process level, the high-efficiency point efficiency of the centrifugal fan and the efficiency of the centrifugal fan under variable working conditions are improved, and tests show that the efficiency is improved by 2-3% under the design working conditions and the large-flow working conditions.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of an air inlet structure of a conventional centrifugal fan;
fig. 2 is a schematic structural view of a large arc air inlet of the centrifugal fan of the present invention;
FIG. 3 is a schematic diagram comparing the structure of the large arc air inlet and the traditional air inlet of the centrifugal fan of the present invention;
FIG. 4 is a schematic structural view of the centrifugal fan according to the present invention, in which a straight section is added to the large arc air inlet;
FIG. 5 is a graph showing the variation of the peak efficiency of fans with different air inlet radii;
FIG. 6a is a graph of the flow-full pressure performance test of the central air inlet and the 2-half-diameter arc air inlet of the present invention;
FIG. 6b is a graph of the flow-efficiency performance of the central air inlet and the 2-half-diameter arc air inlet of the present invention;
FIG. 7a is a graph comparing fan simulation and experimental values for flow versus full pressure performance;
FIG. 7b is a graph of flow versus efficiency performance for simulated and experimental blower values.
In the figure: 1-an air inlet; 2-blade.
Wherein, D in FIG. 11The diameter D of the inlet of the air inlet2Is the diameter D of the outlet of the air inlethThe diameter of the throat of the air inlet, R is the arc radius of the air inlet, and L is the axial distance from the throat of the air inlet to the outlet of the air inlet;
in this application, the radius of the arc of the air inlet is denoted by R ', and the axial distance from the throat of the air inlet to the outlet of the air inlet is denoted by L'.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
Referring to fig. 2 and 3, a large circular arc air inlet structure of a centrifugal fan comprises an air inlet 1 corresponding to the position of an impeller blade 2, the position relationship between the air inlet 1 and the blade 2 is the same as that of a conventional air inlet structure, a front disc of an impeller is arranged at an air outlet of the air inlet 1 and a certain gap is reserved between the front disc and the air outlet, the air inlet 1 has a larger air inlet circular arc radius R 'and an axial distance L' from a throat part of the air inlet to the air inlet outlet, and the preferable value range is 2-5 times of the conventional ratio, namely, the diameter D of the air inlet 11、D2、DhWhile remaining unchanged, R'/Dh＝0.4-1， L’/Dh0.4-1. By increasing the arc radius of the air inlet, the air flow at the inlet of the impeller is more uniform, the efficiency of the centrifugal fan is improved, and the purpose of energy conservation is achieved.
Referring to fig. 4, a straight section is arranged at the throat part of the air inlet 1, so that the stability of air flow after air inlet can be further ensured.
In addition, the large circular arc air inlet structure can be applied to the traditional binary blade centrifugal impeller, including backward-bent blades, radial blades and forward-bent blades, and also can be applied to the centrifugal impeller with ternary blades.
Measurement of Performance
The fan efficiency measuring method refers to GB/T1236-2017, the rotating speed is set to 2900r/min, and a 5-48 type conical wheel cover fan is selected.
When the arc radius ratio different from that of the original air inlet is selected, the efficiency of the highest efficiency point of the fan with different air inlets is shown in fig. 5.
The original air inlet and the 2-half-diameter arc air inlet are selected for further experiments, the experimental results are shown in fig. 6a and 6b, and it can be seen from fig. 6a and 6b that when the arc radius of the air inlet is 2 times of the original radius, the efficiency of the fan is improved by nearly 2%, so that the loss of the efficiency of the fan after the wheel cover is changed into a conical structure can be compensated.
Meanwhile, as can be seen from fig. 7a and 7b, the experimental data variation trend and amplitude of fig. 6 can be well matched with the simulated calculated value.
In the present application, the structures and the connection relations that are not described in detail are all the prior art, and the structures and the principles thereof are known in the prior art and are not described herein again.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (5)
1. The utility model provides a centrifugal fan orthodrome air intake structure, includes an air intake that corresponds with impeller blade position, its characterized in that: the air inlet is provided with an air inlet circular arc radius R 'which is 2-5 times of the conventional ratio and an axial distance L' from the throat part of the air inlet to the outlet of the air inlet.
2. The great arc air inlet structure of the centrifugal fan according to claim 1, characterized in that: the arc radius R ' of the air inlet and the axial distance L ' from the throat part to the outlet of the air inlet meet the requirement of R '/Dh＝0.4-1，L’/Dh＝0.4-1，DhIs the diameter of the throat part of the air inlet.
3. The great arc air inlet structure of the centrifugal fan according to claim 1 or 2, characterized in that: and a straight section is arranged at the throat part of the air inlet.
4. The great arc air inlet structure of the centrifugal fan according to claim 1 or 2, characterized in that: the large circular arc air inlet structure can be applied to the traditional two-element blade centrifugal impeller and the three-element blade centrifugal impeller.
5. The great arc air inlet structure of the centrifugal fan as claimed in claim 4, wherein: the binary blade centrifugal impeller comprises backward bent blades, radial blades and forward bent blades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921952162.XU CN212055267U (en) | 2019-11-13 | 2019-11-13 | Large arc air inlet structure of centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921952162.XU CN212055267U (en) | 2019-11-13 | 2019-11-13 | Large arc air inlet structure of centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212055267U true CN212055267U (en) | 2020-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921952162.XU Active CN212055267U (en) | 2019-11-13 | 2019-11-13 | Large arc air inlet structure of centrifugal fan |
Country Status (1)
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| CN (1) | CN212055267U (en) |
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2019
- 2019-11-13 CN CN201921952162.XU patent/CN212055267U/en active Active
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