CN211666938U - Composite arc blade and impeller of backward centrifugal ventilator - Google Patents
Composite arc blade and impeller of backward centrifugal ventilator Download PDFInfo
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- CN211666938U CN211666938U CN202020120572.4U CN202020120572U CN211666938U CN 211666938 U CN211666938 U CN 211666938U CN 202020120572 U CN202020120572 U CN 202020120572U CN 211666938 U CN211666938 U CN 211666938U
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Abstract
The utility model discloses a to centrifugal fan' S compound pitch arc blade and impeller, through improving existing arc blade, form the arc blade that is formed by the multistage pitch arc is compound, include air inlet section, first changeover portion, interlude, second changeover portion and air-out section in proper order from the air inlet to the air-out direction, wherein air inlet section, interlude and air-out section are the pitch arc that the camber is the same or different, and first changeover portion and second changeover portion are "S" shape pitch arc.
Description
Technical Field
The utility model relates to a ventilation blower technical field especially relates to a compound pitch arc blade and impeller of backward centrifugal fan.
Background
The blades are key parts of the impeller of the ventilator and have decisive influence on the performance of the ventilator. The cross section of the impeller blade of the backward centrifugal ventilator is generally in a shape of a flat plate, an arc or an airfoil. In order to improve the parameters and the efficiency of the ventilator, the predecessor carries out a plurality of effective researches and practices on the arc-shaped section of the blade and obviously progresses, and on the basis of the blade with the arc-shaped section with a single radius, the blade with the efficient composite arc-shaped section, such as a double arc-shaped section, an S-shaped section, a three arc-shaped section and the like, is generated.
Consequently, the improvement of centrifugal fan blade is showing very to the performance influence of ventilation blower, on predecessor's basis, the utility model discloses the people carries out the improvement of lean refinement to the blade to improve the performance and the efficiency of ventilation blower.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a to centrifugal fan' S compound pitch arc blade and impeller, through improving existing arc blade, form the arc blade that is formed by the multistage pitch arc is compound, according to the flow direction of air current at the blade passageway, the blade includes air inlet section, first changeover portion, interlude, second changeover portion and air-out section from the air inlet to the air-out direction in proper order, wherein air inlet section, interlude and air-out section are the pitch arc that the camber is the same or different, first changeover portion and second changeover portion are "S" shape pitch arc.
The utility model discloses a following technical scheme realizes:
the utility model provides a compound pitch arc blade and impeller to centrifugal fan, is in including antetheca, after-poppet and setting arc blade between antetheca and the after-poppet, arc blade is formed by the multistage pitch arc is compound, arc blade includes air inlet section, first changeover portion, interlude, second changeover portion and air-out section from the air inlet to the air-out direction in proper order, smooth connection between two sections adjacent pitch arcs is wanted to the multistage pitch arc, air inlet section, interlude and air-out section are the same or the different circular arc of radius, first changeover portion and second changeover portion are "S" shape pitch arc.
Furthermore, the air inlet section, the middle section and the air outlet section are arcs with the same or different curvatures.
Further, first changeover portion includes two sections radian opposite direction's pitch arc, and wherein the pitch arc of being connected with the interlude is convex to blade non-working face direction, and the pitch arc of being connected with the air inlet section is convex to blade working face direction.
Further, the second changeover portion includes two sections radian opposite direction's pitch arc, and wherein the pitch arc of being connected with the interlude is convex to blade non-working face direction, and the pitch arc of being connected with the air-out section is convex to blade working face direction.
A design method of a compound arc blade of a backward centrifugal fan comprises the following steps:
(1) the existing arc-shaped blade is divided into three sections along the arc length direction: an initial air inlet section 'cd', an initial middle section 'bc' and an initial air outlet section 'ab';
(2) deflecting the initial air outlet section 'ab' along the rotation direction of the blade by an angle theta by taking the center of the impeller as the circle center1Forming an air outlet deflection section' a1b1”；
(3) Deflecting the initial air inlet section cd along the rotation direction of the blade by an angle theta by taking the center of the impeller as the center of a circle2Forming an air inlet deflection section' c1d1”；
(4) The air inlet deflection section ' c ' is deflected by an ' S ' -shaped arc ' uvw1d1"smoothly connects with the initial intermediate section" bc "to form a first transition section, wherein the point" w "is on the arc" c1d1The "upper" u "point is on the arc" bc ", and the" v "point is the turning point of the" S "shaped arc;
(5) smoothly connecting the air outlet deflection section and the initial middle section "bc" by using an "S" -shaped arc line "efg" to form a second transition section, wherein the point "e" is positioned on an arc line "a1b1"Upper" point "g" is on arc "bc", and "f" point is the turning point of "S" shaped arc;
(6) cutting machineExcept for1"," bg "," uc ", and" c1w' section to form smooth compound arc blade1efguvwd1", the arc-shaped blades sequentially comprise an air outlet section" a "from the air inlet to the air outlet1e', the second transition section "efg", which is the middle section "gu", the first transition section "uvw", the air intake section "wd1”。
Further, the total arc length of the existing arc-shaped blade is L, and the arc length of the initial air inlet section 'cd' is L3The initial middle segment has an arc length of "bc" of L2The arc length of the initial air outlet section 'ab' is L1Characterized in that L is1/L＝0.2～0.4，L2/L＝0.5～0.7，L3/L＝0.1～0.2。
Further, θ is2The angle range of the angle is 0.5-3 degrees.
Further, θ is1The angle range of the angle is 1-6 degrees.
The beneficial effects of the utility model reside in that:
the existing single arc blade has the inlet width of U and the outlet width of W. According to the utility model discloses a compound arc blade, the passageway between the impeller blade that forms, import width U1Slightly smaller than U, outlet width W1The length of the center line of the blade channel is slightly reduced compared with W, so that a fluid channel with larger expansion degree is formed, the gas flow in the impeller is further stabilized, and the flow loss of gas flow separation is reduced; on the other hand, the slight shortening of the overall length of the blade also reduces the friction loss of the boundary layer between the air flow and the blade, thereby improving the static pressure of the ventilator and the static pressure efficiency thereof.
The initial air outlet section rotates around the center of the impeller to form air outlet section deflection, the initial air inlet section rotates around the center of the impeller to form air inlet section deflection, and the initial air outlet section and the initial air inlet section both rotate around the center of the impeller, so that the mounting angles of the inlet and the outlet of the impeller blade are kept unchanged. Adopt the utility model discloses a backward centrifugal fan impeller blade is limited to the change of blade camber line shape, and the material cost and the processing cost of use do not increase, adopt current processing technology can conveniently realize, and improve exerting oneself and efficiency of impeller and ventilation blower and can bring the convenient and long-term operation's of lectotype energy saving and consumption reduction for the user, have obvious economy and social value.
Drawings
FIG. 1 is a sectional view of the circumferential surface of an impeller of an arc blade of a comparative prototype I;
FIG. 2 is a profile plot of the impeller blades of comparative prototype one;
FIG. 3 is a sectional rotation view of a blade profile of an impeller according to the first embodiment;
FIG. 4 is a schematic view of a linear optical sliding connection of impeller blades according to the first embodiment;
FIG. 5 is an enlarged view of section I of the vane-type linear optical sliding connection of the impeller according to the first embodiment;
FIG. 6 is an enlarged view of section II of the vane-type linear optical sliding connection of the impeller according to the first embodiment;
FIG. 7 is a diagram of a linear optical sliding connection of impeller blades according to the first embodiment;
FIG. 8 is a sectional view of the circumferential surface of an impeller according to the first embodiment;
FIG. 9 is a meridional section view of the impeller of comparative sample No. two;
FIG. 10 is a profile plot of the impeller blades of comparative sample two;
FIG. 11 is a view illustrating a rotation process of each section of a vane profile of the second embodiment;
FIG. 12 is a schematic view of the linear optical sliding connection of the vane of the impeller according to the second embodiment;
FIG. 13 is an enlarged view of section III of a vane-type linear optical sliding connection diagram of the second embodiment;
FIG. 14 is an enlarged view of part IV of the linear optical sliding connection of the impeller blade of the second embodiment;
FIG. 15 is a sectional view of the vane-shaped linear optical sliding connection of the second embodiment;
FIG. 16 is a sectional view of the circumferential surface of an impeller according to the second embodiment;
FIG. 17 is a graph of static pressure versus volumetric flow for comparative sample one and example one;
FIG. 18 is a graph of hydrostatic efficiency versus volumetric flow for comparative sample one and example one;
FIG. 19 is a graph of static pressure versus volume flow for comparative sample two and example two;
fig. 20 is a graph of hydrostatic efficiency versus volumetric flow rate for comparative sample two and example two.
Detailed Description
Example 1
Referring to fig. 1-2, a sectional view of the impeller circumferential surface and a view of the blade profile (a projection line of the blade working surface on the impeller circumferential surface view) of a single arc-shaped blade in the prior art are shown, the single arc-shaped blade and the impeller in the prior art are used as a first comparison sample, the blade profile on the blade profile "abcd" arc line of the first comparison sample is divided into three sections "ab", "bc" and "cd", and the arc radius of the three sections of arc-shaped "ab", "bc" and "cd" in the backward centrifugal fan blade of the first comparison sample is Ra. Where point a corresponds to the blade exit radius R2＝ΦD2(2, d point corresponds to blade inlet radius R1＝ΦD1The wrap angle of the blade is phi, the center of the impeller is taken as the center of a circle, and the radius of the circle where the point b is located is R4The radius of the circle where the point c is located is R3. The vane passages are formed with an inlet width U and an outlet width W.
Referring to fig. 3-8, the first embodiment of the present invention is further improved on the basis of the blade of the comparative sample machine. The utility model relates to a to centrifugal fan's compound pitch arc blade and impeller, be in including front bezel, back plate and setting arc blade between front bezel and the back plate, the arc blade periphery is formed by the multistage pitch arc is compound, includes air inlet section "d" in proper order from the air inlet to the air-out direction1w ", first changeover portion" wvu ", interlude" ug ", second changeover portion" gfe "and air-out section" ea1", any two adjacent arcs of the multiple arcs are connected smoothly, that is, any two adjacent arcs are connected tangentially, and the composite arc blade is a smooth whole. Wherein air inlet section, interlude and air-out section are the camber line that the radius is the same, and first changeover portion and second changeover portion are "S" shape camber line.
Further, cd in the comparison sample machine I is used as an initial air inlet section, and ab in the comparison sample machine I "The section is used as an initial air outlet section, and a section bc in the first prototype is used as an initial middle section; wherein the arc length of the initial air inlet section is L3Initial mid-section arc length L2The arc length of the initial air outlet section is L1，L＝L1+L2+L3The arc length of the initial middle segment of the first embodiment satisfies L20.671; the arc length of the initial air outlet section satisfies L10.207% of/L; the arc length of the initial air inlet section satisfies L3/L＝0.122。
In this embodiment, the initial air outlet section uses the center of the impeller as the center of a circle, and deflects 2 degrees along the rotation direction of the blade to form an air outlet deflection section. After deflection, a1Both points are at a radius of R2On the circumference of (a).
The initial air inlet section deflects 1 degree along the rotation direction of the blades by taking the center of the impeller as the center of a circle to form an air inlet deflection section. After deflection, both points c, c1 are at radius R3On the circumference of (1), both points d and d1 have a radius R1On the circumference of (a).
Smoothly connecting the ' a ' by adopting an ' S ' -shaped arc line ' efg ' and ' uvw1b1”、“bc”、“c1d1"these three arcs, thus forming an embodiment-blade arc comprising seven arcs, wherein the blade wrap angle is Φ1. Wherein the two arc sections "ef" and "fg" of the second transition section "efg" constituting the "S" arc are convex in opposite directions: the section ef is an arc line section protruding towards the direction far away from the center of the impeller, and the section fg is an arc line section protruding towards the center of the impeller; the protruding directions of two arc line sections 'uv' and 'vw' forming the first transition section 'uvw' of the 'S' -shaped arc line are opposite: the uv section is an arc section protruding towards the center direction of the impeller, and the vw section is an arc section protruding away from the center direction of the impeller; the inlet width of the formed blade channel is U1An outlet width of W1。
In this embodiment, "a" is smoothly connected by "S" shaped arc "efg1b1The specific way of making the 'and' bc 'two sections of arcs is that in the arc' a1b1Taking the point "e" from the top, making the arc line "ef" and the arc line "a1b1"tangent" S "arc" efg "where" g "is on arc" bc ", arc" fg "is tangent to arc" bc ", and finally arc" eb "is removed1The "segment and arc" bg "segment form smooth arc" efg ".
In this embodiment, "bc" and "c" are smoothly connected by "S" shaped arc "uvw1d1The specific method of the two sections of arcs is that a u point is taken on an arc bc, an arc uv is made to be tangent with the arc bc, in an S-shaped arc uv, a w point is on the arc c1d1Upper, arc line vw and arc line c1d1Tangent, and finally, arc uc segment and arc c are removed1And a w segment forming a smooth arc "uvw".
The existing blade is designed by the method to form a smooth composite arc blade' a1efguvwd1”。
The utility model discloses compound pitch arc blade, because initial air-out section deflection angle is slightly bigger than initial air inlet section deflection angle, lead to comparing its blade cornerite of single pitch arc blade and reduce slightly, the cornerite of contrast prototype one is 61.5, and the cornerite of embodiment one is 60.5, the utility model discloses the blade cornerite of embodiment one and contrast prototype one all is in suitable cornerite scope: 55 to 65 degrees.
The following compares the performance of the embodiment one and the comparison sample machine one.
Compared with the backward centrifugal ventilator of the comparative prototype I, the main structure sizes and the matched motor and running rotating speed are the same except for the difference of the arc shapes of the blade sections. The same characteristic structure parameters are as follows:
outer diameter of the wheel disc: phi D3＝Φ636mm
Blade outer diameter: phi D2＝Φ356mm
Inner diameter of the blade: phi D1＝Φ570mm
Blade thickness: 2.5mm
Blade inlet mounting angle β1A＝16.5°
Blade inlet mounting angle β2A＝28.5°
The main parameters of the ventilator are compared in table 1:
TABLE 1
A comparison of ventilator performance curves is shown in figures 17 and 18.
Example 2
Referring to fig. 9-10, there are shown a sectional view of the impeller circumferential surface and a view of the blade profile (the projection line of the blade working surface on the impeller circumferential surface view) of another prior art arc blade, which is a comparative sample two, the blade of the comparative sample two is composed of three sections of arcs "ab", "bc" and "cd" with different radii, and the corresponding radii are Ra, Rb and Rc, respectively. Where point a corresponds to the blade exit radius R2＝ΦD2(2, d point corresponds to blade inlet radius R1＝ΦD1The wrap angle of the blade is phi, the center of the impeller is taken as the center of a circle, and the radius of the circle where the point b is located is R4The radius of the circle where the point c is located is R3. The vane passages are formed with an inlet width U and an outlet width W.
Referring to fig. 11 to 16, the cross-sectional shape of the impeller blade of the second comparative sample machine of the present invention is a compound arc shape composed of three arcs with different radii; the embodiment of the utility model provides an impeller blade cross sectional shape of second is the blade each section pitch arc process that will compare model machine two the utility model discloses a compound arc blade that design method formed.
Compared with the backward centrifugal ventilator of the second sample machine of the embodiment and the second sample machine of the comparison, the main structure sizes, the matched motor and the running rotating speed are the same except that the arc shapes of the blade sections are different. The same characteristic structure parameters are as follows:
outer diameter of the wheel disc: phi D3＝Φ636mm
Blade outer diameter: phi D2＝Φ356mm
Inner diameter of the blade: phi D1＝Φ570mm
Blade thickness: 2.5mm
Blade inlet mounting angle β1A＝18°
Blade inlet mounting angle β2A＝30°
L1/L＝0.240
L2/L＝0.556
L3/L＝0.200
The wrap angle of comparative sample two was 61.5 °, and the wrap angle of example two was 60.5 °. The embodiment of the utility model provides a two is the same with the blade cornerite of contrast model machine two, all is in suitable cornerite scope: 55 to 65 degrees.
The main parameters of the ventilator are compared in table 2:
TABLE 2
A comparison of ventilator performance curves is shown in figures 19 and 20.
Claims (5)
1. The utility model provides a compound pitch arc blade to centrifugal fan, is in including preceding dish, after-disc and setting arc blade between preceding dish and the after-disc, arc blade is formed by the compound of multistage pitch arc, its characterized in that, arc blade includes air inlet section, first changeover portion, interlude, second changeover portion and air-out section from the air inlet to the air-out direction in proper order, smooth connection between two sections adjacent pitch arcs is wanted to the multistage pitch arc, air inlet section, interlude and air-out section are the same or the different circular arc of radius, first changeover portion and second changeover portion are "S" shape pitch arc.
2. The compound arc blade of claim 1 wherein the inlet, intermediate and outlet sections are arcs of the same or different curvature.
3. The compound arc blade of claim 1 wherein the first transition segment comprises two arcs of opposite arc, wherein the arc connected to the intermediate segment is convex in the direction of the non-working surface of the blade and the arc connected to the air intake segment is convex in the direction of the working surface of the blade.
4. The compound arc blade of claim 1 wherein the second transition segment comprises two arcs of opposite arc, wherein the arc connected to the intermediate segment is convex in the direction of the non-working surface of the blade and the arc connected to the outlet segment is convex in the direction of the working surface of the blade.
5. An impeller for a backward centrifugal fan, comprising the compound arc blade of any one of claims 1 to 4.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111156193A (en) * | 2020-01-19 | 2020-05-15 | 浙江科贸智能机电股份有限公司 | Composite arc blade and impeller of backward centrifugal ventilator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111156193A (en) * | 2020-01-19 | 2020-05-15 | 浙江科贸智能机电股份有限公司 | Composite arc blade and impeller of backward centrifugal ventilator |
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