CN117167295A - High static pressure backward multi-wing centrifugal fan - Google Patents
High static pressure backward multi-wing centrifugal fan Download PDFInfo
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Abstract
The invention relates to the field of centrifugal fans, and particularly discloses a high-static-pressure backward multi-wing centrifugal fan, which comprises a volute, an impeller and a current collector, wherein the impeller and the current collector are arranged in the volute, the molded line of the volute is a spiral volute molded line, the current collector comprises a connecting part, a shrinking part and a linear part which are sequentially connected and are enclosed to form an air inlet, part of the linear part extends into the air inlet of a front disc, blades are of a backward single arc structure extending along the axial direction parallel to a rear disc, the inlet angle 2 of the blades is 130-140 degrees, and the outlet angle 3 of the blades is 70-90 degrees. This kind of high static pressure backward multi-wing centrifugal fan has improved fan effective flow scope and has improved fan efficiency, can both guarantee that the flow steadily descends when making static pressure promote to let the fan have very wide working range, whole fan has good air inlet effect, makes the air current smoothly get into the impeller, thereby fan static pressure and flow promote, and static pressure improves and makes the fan suction good, is convenient for absorb the oil smoke fast, lets personnel have better operational environment.
Description
Technical Field
The invention relates to the field of centrifugal fans, in particular to a high static pressure backward multi-wing centrifugal fan.
Background
The backward centrifugal fan is an environment-friendly equipment matched fan and is used in the scenes of factory ventilation, equipment cooling, constant temperature and the like. In recent years, with the continuous improvement of the requirements of society on energy conservation and environmental protection, the performance index requirements of fans matched with environmental protection equipment are also increasingly improved. At present, the original environment-friendly equipment matched fan has the common problems of low static pressure, low fan efficiency and the like in small flow, and is difficult to meet the requirements of society and users. Therefore, development of the fan matched with the high-efficiency and high-flow environment-friendly equipment is scheduled.
The fan relies on the impeller to produce the air current, and the impeller includes toper front disc and back dish, and a plurality of blades of equipartition on the front and back dish, the casing reduces windage and retrieves static pressure.
However, the impeller structure of the existing backward multi-wing centrifugal fan is not matched with the volute line, the shell is unfavorable for wind pressure generation, and air flow easily disappears in the shell along with rotation of the impeller, so that the existing backward multi-wing centrifugal fan is low in flow, high in power consumption and low in static pressure, the use cost of a user is increased, and the performance of the existing high-static pressure backward multi-wing centrifugal fan needs to be further optimized.
Disclosure of Invention
The invention aims to provide a high static pressure backward multi-wing centrifugal fan, and aims to solve the problems of low fan flow, high power consumption and low static pressure in the prior art.
In order to achieve the above purpose, the invention provides a high static pressure backward multi-wing centrifugal fan, which comprises a spiral volute, an impeller and a current collector, wherein the impeller and the current collector are arranged in the volute, the molded line of the volute is a spiral volute molded line, the volute comprises an air inlet, the impeller is provided with a front disc and a rear disc, a plurality of blades are arranged on the rear disc in a surrounding mode, an air inlet is arranged in the middle of the front disc, the current collector comprises a connecting part, a shrinkage part and a linear part which are sequentially connected and are surrounded to form the air inlet, the linear part extends into the air inlet of the front disc, the blades are of a backward single arc structure which extends along the axial direction parallel to the rear disc, the inlet angle 2 of the blades is 130-140 DEG, the outlet angle 3 of the blades is 70-90 DEG, the blades comprise a front edge, a tail edge, a first side edge connected between the front edge and a second side edge connected between the front edge and the first end of the tail edge, the first side edge is a side edge close to the air inlet, the second side edge is a side far away from the air inlet, and an inverted side is arranged between the first side edge and the front edge, and the width of the blades gradually changes from the front edge to the tail edge;
the diameter of the outer circumference surrounded by the outer ends of all the blades of the impeller is phi 1, the diameter of the inner circumference surrounded by the inner ends of all the blades of the impeller is phi 2, the width of the inner cavity of the volute is L1, the maximum width of the blades is L2, and the minimum width of the blades is L3;
the blades are arc sheet metal blades, the radius of the arc of each blade is R6, and the thickness of each blade is D1;
when phi 1 is 335, phi 2 is 180-200, L1 is 125-140, L2 is 70-85, L3 is 50-60, R6 is 225-235, and D1 is 15-20.
Further, when φ 1 is 335, φ 2 is 190, L1 is 130, L2 is 77, L3 is 54, R6 is 227, D1 is 18, the inlet angle during blade installation is 136, the outlet angle during blade installation is 80, and the number of blades is 18.
Further, the current collector is intercepted by a plane passing through the central axis of the current collector, an included angle 4 between a connecting part and a necking part on the section is 100-108 degrees, the length L6 of a straight line part extending into an impeller is 3-5, the length L7 of the straight line part is 6-8, the connecting part is in a ring shape, the peripheral diameter phi 4 is 310-330, the necking part is connected to the inner periphery of the connecting part and extends towards the volute, the diameter of the necking part is gradually reduced, the diameter phi 5 at the widest part of the necking part is 240-260, the radius R8 at the narrowest part of the necking part is 105-111, and the vertical distance L5 between the widest part and the narrowest part is 65-75; the impeller is intercepted by a plane passing through the central axis of the impeller, the included angle 5 between the front disc and the rear disc on the section is 18-22 degrees, and the diameter phi 3 of the air suction opening is 220-232.
Further, the radius of the rounding is R7, R7 is 18-22, and the arc length of the rounding is 29-33.
Further, the radius R7 of the rounded corner is 20, the arc length of the rounded corner is 31, the width L4 of the front edge is 57, the included angle 4 between the connecting portion and the necking portion is 104 °, the length L6 of the straight portion extending into the impeller is 4, the length L7 of the straight portion is 7, the peripheral diameter phi 4 of the connecting portion is 320, the diameter phi 5 of the widest part of the necking portion is 250, the radius R8 of the narrowest part of the necking portion is 108, the vertical distance L5 between the widest part and the narrowest part is 70, the included angle < 5 between the front disc and the rear disc is 20 °, and the diameter phi 3 of the air suction port is 226.
Further, the volute comprises a first diffusion straight line segment, a volute tongue segment, a first arc line segment, a second arc line segment, a third arc line segment, a fourth arc line segment and a second diffusion straight line segment which are sequentially and tangentially connected; the first diffusion straight line segment and the second diffusion straight line segment are enclosed to form an air outlet, and the first arc line segment, the second arc line segment, the third arc line segment and the fourth arc line segment are all non-concentric.
Further, when the second diffusion straight line segment is located in the second quadrant and parallel to the X axis and phi 1 is 335, the center O3 coordinate of the first arc segment is (-14, -10), the radius R3 is 170-175, the arc length is 90-95, the center O4 coordinate of the second arc segment is (1, -16), the radius R4 is 180-190, the arc length is 270-290, the center O1 coordinate of the third arc segment is (19, 33), the radius R1 is 230-240, the arc length is 310-330, the center O2 coordinate of the fourth arc segment is (-23, 18), the radius R2 is 270-290, the arc length is 360-375, and the included angle between the first diffusion straight line segment and the first arc segment is 30-35 degrees.
Further, when the second diffusion straight line segment is located in the second quadrant and parallel to the X axis, and phi 1 is 335, the center O3 coordinate of the first arc segment is (-14, -10), the radius R3 is 172, the arc length is 93, the center O4 coordinate of the second arc segment is (1, -16), the radius R4 is 184, the arc length is 279, the center O1 coordinate of the third arc segment is (19, 33), the radius R1 is 234, the arc length is 318, the center O2 coordinate of the fourth arc segment is (-23, 18), the radius R2 is 277, the arc length is 364, and the angle 1 between the first diffusion straight line segment and the first arc segment is 33 °.
Further, when φ 1 is 335, the radius R5 of the volute tongue section is 12-17, and the arc length is 37-42.
Further, when φ 1 is 335, the radius R5 of the volute tongue section is 15 and the arc length is 39.
The high static pressure backward multi-wing centrifugal fan provided by the invention adopts the spiral shell line, so that the accumulation flow of air flow in the shell is improved, the flow loss of the circumference of the impeller is reduced, the effective flow range of the fan is increased, and the efficiency of the fan is improved; by reasonably designing the impeller structure, the high flow rate is improved to ensure that the impeller has strong acting capability, so that the flow rate can be ensured to be stably reduced when the static pressure is improved, and the fan has a wide working range; through the shape and the size of design mass collector, make whole fan have good air inlet effect, make the air current smoothly get into the impeller to fan static pressure and flow promote, and static pressure improves makes fan suction good, is convenient for absorb the oil smoke fast, lets personnel have better operational environment.
Drawings
FIG. 1 is a schematic view of a high static pressure backward multi-wing centrifugal fan with partial cutaway;
FIG. 2 is a schematic structural view of a volute;
FIG. 3 is a schematic view of a part of the impeller in cross-section
FIG. 4 is a side cross-sectional view of an impeller;
FIG. 5 is a graph of performance plotted under test data from comparative examples;
FIG. 6 is a graph of performance plotted against test data from a test case.
Reference numerals illustrate:
a volute 1; a current collector 11; a connection portion 111; a tapered portion 112 and a linear portion 113; an air inlet 114; an air outlet 12; a first diffuser straight section 13; volute tongue section 14; a first arc segment 15; a second arc segment 16; a third arc segment 17; a fourth arc segment 18; a second diffuser straight section 19;
an impeller 2; a blade 21; a leading edge 211; rounded corners 212; a front plate 22; a rear plate 23; and an air suction port 24.
Detailed Description
The present invention will be described in detail with reference to specific examples.
In the present invention, unless explicitly stated and limited otherwise, when terminology such as "disposed," "connected," or "connected" is intended to be interpreted broadly, such as, for example, a fixed connection, a removable connection, or an integral connection; may be directly connected or connected through one or more intermediaries. The specific meaning of the terms described above in the present invention can be understood by those skilled in the art according to the specific circumstances. The direction words appearing in the invention are used for better explaining the characteristics of the features and the relation among the features, and it is understood that when the arrangement direction of the invention is changed, the characteristics of the features and the directions of the relation among the features are correspondingly changed, so that the direction words do not form absolute limiting effect on the characteristics of the features and the relation among the features in space, and only play a role in relative limiting.
Referring to fig. 1-6, the invention provides a high static pressure backward multi-wing centrifugal fan, which comprises a spiral casing 1, an impeller 2 and a current collector 11, wherein the impeller 2 and the current collector are arranged in the spiral casing, the molded line of the spiral casing 1 is a spiral casing molded line, the spiral casing 1 comprises an air inlet 114, the impeller 2 is provided with a front disc 22 and a rear disc 23, a plurality of blades 21 are arranged on the rear disc 23 in a surrounding array, an air inlet 24 is arranged in the middle of the front disc 22, the current collector 11 comprises a connecting part 111, a shrinking opening 112 and a linear part 113 which are sequentially connected and are enclosed to form the air inlet 114, part of the linear part 113 stretches into the air inlet 24 of the front disc 22, the blades 21 are of a backward single arc structure extending along the axial direction parallel to the rear disc 23, the inlet angle 2 of the blades 21 is 130-140 °, the outlet angle 3 of the blades is 70-90 °, the inlet angle 2 of the blades is 136 ° of the blades, the outlet angle 3 of the blades is 80 ° and the number of the blades are 18. The blade comprises a front edge 211, a tail edge, a first side edge connected between the front edge and a first end of the tail edge and a second side edge connected between the front edge and a second end of the tail edge, wherein the first side edge is a side edge close to the air inlet 114, the second side edge is a side edge far away from the air inlet 114, a rounding angle 212 is arranged between the first side edge and the front edge 211, and the width of the blade 21 gradually decreases from the front edge 211 to the tail edge;
the diameter of the outer circumference surrounded by the outer ends of all the blades 21 of the impeller 2 is phi 1, the diameter of the inner circumference surrounded by the inner ends of all the blades 21 of the impeller 2 is phi 2, the width of the inner cavity of the volute 1 is L1, the maximum width of the blades 21 is L2, and the minimum width of the blades 21 is L3;
the blades 21 are arc sheet metal blades, the radius of the arc of the blades 21 is R6, and the thickness of the blades 21 is D1;
when phi 1 is 335, phi 2 is 180-200, L1 is 125-140, L2 is 70-85, L3 is 50-60, R6 is 225-235, and D1 is 15-20. Preferably, when φ 1 is 335, φ 2 is 190, L1 is 130, L2 is 77, L3 is 54, R6 is 227, and D1 is 18. The structural arrangement under the above parameters was tested to achieve the best performance.
The invention adopts a dimensionless mode to describe the structural parameters of the high static pressure backward multi-wing centrifugal fan, namely, the invention can carry out equal proportion scaling in actual production based on the dimensionless basic structure, and the scaling also falls into the protection scope of the invention.
Through the technical scheme, the high static pressure backward multi-wing centrifugal fan has the advantages that the flow is improved to ensure the impeller 2 to have strong acting capability by designing the shape and the size of the current collector and reasonably designing the structure of the impeller 2 and the inlet and outlet angles of the impeller 2, so that the flow can be ensured to stably drop when the static pressure is lifted, and the fan has a wide working range. Through tests, the improvement can obtain the effects that the absolute value of static pressure and static pressure efficiency are still higher when the flow rate is larger, solves the problems of static pressure reduction, rapid power reduction, obvious flow rate reduction, unstable performance curve and not wide use working condition in the prior art when the flow rate is small and medium, and can still perform effective pumping operation when the flow rate is large; and moreover, a spiral volute molded line is adopted, so that the airflow is improved to be accumulated in the volute, the flow loss of the circumference of the impeller 2 is reduced, the effective flow range of the fan is increased, the fan efficiency is improved, the fan efficiency is not too low, and the effective suction operation can be performed at a small flow.
Based on the characteristics of the wider working range, when the high static pressure backward multi-wing centrifugal fan is used for the smoke exhaust ventilator, the performance parameter requirements required by the smoke exhaust ventilator can be met no matter in high flow or low flow, so that the smoke exhaust ventilator also has the wider working range, and more application scene requirements are met.
In this embodiment, the plane passing through the central axis of the current collector 11 is used to intercept the current collector 11, the included angle ∈4 between the connecting portion 111 and the necking portion 112 on the cross section is 100-108 °, the length L6 of the straight portion 113 extending into the impeller 2 is 3-5, the length L7 of the straight portion 113 is 6-8, the connecting portion 111 is annular, the peripheral diameter Φ4 is 310-330, the necking portion 112 is connected to the inner periphery of the connecting portion 111 and extends towards the direction of the volute 1, the diameter of the necking portion 112 is gradually reduced, the diameter Φ5 at the widest part of the necking portion 112 is 240-260, the radius R8 at the narrowest part of the necking portion 112 is 105-111, and the vertical distance L5 between the widest part and the narrowest part is 65-75; the impeller 2 is intercepted by a plane passing through the central axis of the impeller 2, the included angle 5 between the front disc 22 and the rear disc 23 on the section is 18-22 degrees, and the diameter phi 3 of the air suction opening 24 is 220-232. Preferably, the included angle ∈4 between the connecting portion 111 and the necking portion 112 is 104 °, the length L6 of the straight portion 113 extending into the impeller 2 is 4, the length L7 of the straight portion 113 is 7, the outer peripheral diameter Φ4 of the connecting portion 111 is 320, the diameter Φ5 of the widest portion of the necking portion 112 is 250, the radius R8 of the narrowest portion of the necking portion 112 is 108, the vertical distance L5 between the widest portion and the narrowest portion is 70, the included angle ∈5 between the front disc 22 and the rear disc 23 is 20 °, and the diameter Φ3 of the air suction port 24 is 226. Through tests, under the performance parameters, the collector 11 and the impeller 2 can be matched better to collect and guide wind.
In this embodiment, the radius of the fillet 212 is R7, R7 is 18-22, and the arc length of the fillet 212 is 29-33. Preferably, the radius R7 of the fillet 212 is 20, the arc length of the fillet is 31, and the width L4 of the leading edge is 57.
In this embodiment, as shown in fig. 2, the volute 1 includes a first diffusion straight-line segment 13, a volute tongue segment 14, a first arc segment 15, a second arc segment 16, a third arc segment 17, a fourth arc segment 18, and a second diffusion straight-line segment 19 that are sequentially connected in a tangential manner; the first diffusion straight line segment 13 and the second diffusion straight line segment 19 are enclosed to form an air outlet 12, and the first arc line segment 15, the second arc line segment 16, the third arc line segment 17 and the fourth arc line segment 18 are all non-concentric.
In this embodiment, a rectangular coordinate system is established with the center of the impeller 2 as the origin of coordinates, when the second diffusion straight-line segment 19 is located in the second quadrant and parallel to the X-axis, and when Φ1 is 335, the center O3 of the first arc segment 15 is (-14, -10), the radius R3 is 170-175, the arc length is 90-95, the center O4 of the second arc segment 16 is (1, -16), the radius R4 is 180-190, the arc length is 270-290, the center O1 of the third arc segment 17 is (19, 33), the radius R1 is 230-240, the arc length is 310-330, the center O2 of the fourth arc segment 18 is (-23, 18), the radius R2 is 270-290, the arc length is 360-375, and the angle between the first diffusion straight-line segment 13 and the first arc segment 15 is 30-35 °.
Preferably, a rectangular coordinate system is established by taking the center of the impeller 2 as the origin of coordinates, when the second diffusion straight line 19 is located in the second quadrant and parallel to the X axis, and phi 1 is 335, the center O3 of the first arc segment 15 is (-14, -10), the radius R3 is 172, the arc length is 93, the center O4 of the second arc segment 16 is (1, -16), the radius R4 is 184, the arc length is 279, the center O1 of the third arc segment 17 is (19, 33), the radius R1 is 234, the arc length is 318, the center O2 of the fourth arc segment 18 is (-23, 18), the radius R2 is 277, and the arc length is 364, and the angle 1 between the first diffusion straight line segment 13 and the first arc segment 15 is 33 °.
In this embodiment, when φ 1 is 335, the radius R5 of the volute tongue section 14 is 12-17 and the arc length is 37-42. Preferably, when φ 1 is 335, the radius R5 of the volute tongue section 14 is 15 and the arc length is 39. In this embodiment, by reasonably adjusting the radius and the arc length of the volute tongue section 14, the wind speed of the air outlet 12 can be effectively reduced, so that the total-pressure static pressure efficiency of the high-static-pressure backward multi-wing centrifugal fan is higher.
For the verification of this example, a conventional multi-wing centrifugal fan of model CF-2.5A was used as a comparative example, with an impeller diameter of 250mm. Meanwhile, based on the preferred structural parameters provided by the embodiment, the diameter of the impeller 2 (namely, the diameter of the peripheral circle formed by the outermost ends of the blades) is 335mm, and the high static pressure backward multi-wing centrifugal fan is manufactured as a test example. Comparative and test examples were subjected to performance test, and the test results were converted to a medium density of 1.2 kg/m at an atmospheric pressure of 101325Pa, an atmospheric temperature of 20 ℃ 3 Test data under test conditions, comparative examples are test data shown in table 1 and performance curves shown in fig. 5, test examples are test data shown in table 2 and performance curves shown in fig. 6, the performance curves take volume flow as an abscissa, qvsglu is volume flow, LAGu is a sound level, ηr is fan efficiency, prGu is impeller power, pFGu is full pressure, and psFGu is static pressure.
TABLE 1
TABLE 2
From the test data and performance curves, the overall performance trend is that the volumetric flow rate is increased, the total pressure and the static pressure are reduced, the fan efficiency is increased firstly and then is reduced, and the highest point of the fan efficiency is 54.6% under the condition that the impeller power is increased. For the test case, the overall performance trend is that the volumetric flow is increased and the total pressure and static pressure are reduced under the condition of increasing the impeller power; the fan efficiency also increased and then decreased, but the highest point of the fan efficiency was 67.4%. In terms of performance curve comparison, under the same impeller power (i.e. shaft power), the fan efficiency of the test case is generally 11-14 percent higher than that of the comparative example, the fan static pressure of the test case is generally 20-25 percent higher than that of the comparative example, and the static pressure efficiency of the test case is generally 14-17 percent higher than that of the comparative example. In the comparative example, the volume flow rate at the static pressure approaching 0 was only about 2680Pa, and in the test example, the volume flow rate at the static pressure approaching 0 was about 3800Pa, in view of the comparison of the performance curves, and therefore, the effective volume flow rate of the test example was increased by 40 percentage points or more, and the flow rate of the test example was larger.
The above-described embodiments and features of the embodiments may be combined with each other without conflict.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a high static pressure backward multi-wing centrifugal fan, includes the spiral case, sets up impeller and the mass flow device in the spiral case, and the molded lines of spiral case molded lines, spiral case include the air intake, and the impeller is provided with front disc and back dish, and the array has a plurality of blades around on the back dish, and the middle part of front disc is provided with the inlet scoop, its characterized in that: the current collector comprises a connecting part, a shrinking part and a straight line part which are sequentially connected and are surrounded to form an air inlet, the part of the straight line part stretches into the air inlet of the front disc, the blade is of a backward single arc structure which extends along the axial direction parallel to the rear disc, the inlet angle 2 is 130-140 degrees when the blade is installed, the outlet angle 3 is 70-90 degrees when the blade is installed, the blade comprises a front edge, a tail edge, a first side edge connected between the first ends of the front edge and the tail edge and a second side edge connected between the first ends of the front edge and the tail edge, the first side edge is a side edge close to the air inlet, the second side edge is a side edge far away from the air inlet, a chamfer is arranged between the first side edge and the front edge, and the width of the blade gradually decreases from the front edge to the tail edge;
the diameter of the outer circumference surrounded by the outer ends of all the blades of the impeller is phi 1, the diameter of the inner circumference surrounded by the inner ends of all the blades of the impeller is phi 2, the width of the inner cavity of the volute is L1, the maximum width of the blades is L2, and the minimum width of the blades is L3;
the blades are arc sheet metal blades, the radius of the arc of each blade is R6, and the thickness of each blade is D1;
when phi 1 is 335, phi 2 is 180-200, L1 is 125-140, L2 is 70-85, L3 is 50-60, R6 is 225-235, and D1 is 15-20.
2. The high static pressure backward multi-wing centrifugal fan according to claim 1, wherein: when phi 1 is 335, phi 2 is 190, L1 is 130, L2 is 77, L3 is 54, R6 is 227, D1 is 18, the inlet angle of the blade is 136 DEG, the outlet angle of the blade is 80 DEG, and the number of the blades is 18.
3. The high static pressure backward multi-wing centrifugal fan according to claim 1, wherein:
the method comprises the steps that a plane passing through a central axis of the current collector is used for cutting the current collector, an included angle 4 between a connecting part and a necking part on a section is 100-108 degrees, the length L6 of a straight line part extending into an impeller is 3-5, the length L7 of the straight line part is 6-8, the connecting part is in a ring shape, the peripheral diameter phi 4 is 310-330, the necking part is connected to the inner periphery of the connecting part and extends towards the volute, the diameter of the necking part is gradually reduced, the diameter phi 5 of the widest part of the necking part is 240-260, the radius R8 of the narrowest part of the necking part is 105-111, and the vertical distance L5 between the widest part and the narrowest part is 65-75;
the impeller is intercepted by a plane passing through the central axis of the impeller, the included angle 5 between the front disc and the rear disc on the section is 18-22 degrees, and the diameter phi 3 of the air suction opening is 220-232.
4. A high static pressure backward multi-wing centrifugal fan according to claim 3, wherein: the radius of the rounding is R7, R7 is 18-22, and the arc length of the rounding is 29-33.
5. The high static pressure backward multi-wing centrifugal fan according to claim 4, wherein: the radius R7 of the rounding is 20, the arc length of the rounding is 31, the width L4 of the front edge is 57, the included angle 4 between the connecting part and the necking part is 104 degrees, the length L6 of the straight line part extending into the impeller is 4, the length L7 of the straight line part is 7, the peripheral diameter phi 4 of the connecting part is 320, the diameter phi 5 of the widest part of the necking part is 250, the radius R8 of the narrowest part of the necking part is 108, the vertical distance L5 between the widest part and the narrowest part is 70, the included angle 5 between the front disc and the rear disc is 20 degrees, and the diameter phi 3 of the air suction opening is 226.
6. The high static pressure backward multi-wing centrifugal fan according to claim 1, wherein: the volute comprises a first diffusion straight line segment, a volute tongue segment, a first arc segment, a second arc segment, a third arc segment, a fourth arc segment and a second diffusion straight line segment which are sequentially connected in a tangent mode; the first diffusion straight line segment and the second diffusion straight line segment are enclosed to form an air outlet, and the first arc line segment, the second arc line segment, the third arc line segment and the fourth arc line segment are all non-concentric.
7. The high static pressure backward multi-wing centrifugal fan according to claim 6, wherein: when the second diffusion straight line segment is positioned in the second quadrant and parallel to the X axis, and phi 1 is 335, the center O3 coordinate of the first arc segment is (-14, -10), the radius R3 is 170-175, the arc length is 90-95, the center O4 coordinate of the second arc segment is (1, -16), the radius R4 is 180-190, the arc length is 270-290, the center O1 coordinate of the third arc segment is (19, 33), the radius R1 is 230-240, the arc length is 310-330, the center O2 coordinate of the fourth arc segment is (-23, 18), the radius R2 is 270-290, the arc length is 360-375, and the included angle between the first diffusion straight line segment and the first arc segment is 30-35 degrees.
8. The high static pressure backward multi-wing centrifugal fan according to claim 7, wherein: when the second diffusion straight line segment is positioned in the second quadrant and parallel to the X axis, and phi 1 is 335, the center O3 coordinate of the first arc segment is (-14, -10), the radius R3 is 172, the arc length is 93, the center O4 coordinate of the second arc segment is (1, -16), the radius R4 is 184, the arc length is 279, the center O1 coordinate of the third arc segment is (19, 33), the radius R1 is 234, the arc length is 318, the center O2 coordinate of the fourth arc segment is (-23, 18), the radius R2 is 277, the arc length is 364, and the included angle 1 between the first diffusion straight line segment and the first arc segment is 33 degrees.
9. The high static pressure backward multi-wing centrifugal fan according to claim 7, wherein: when phi 1 is 335, the radius R5 of the volute tongue section is 12-17 and the arc length is 37-42.
10. The high static pressure backward multi-wing centrifugal fan according to claim 9, wherein: when phi 1 is 335, the radius R5 of the volute tongue section is 15 and the arc length is 39.
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| CN202311453683.1A CN117167295B (en) | 2023-11-03 | 2023-11-03 | High static pressure backward multi-wing centrifugal fan |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118273975A (en) * | 2024-05-30 | 2024-07-02 | 佛山市南海九洲普惠风机有限公司 | Efficient static pressure impeller and centrifugal fan |
| CN118361403A (en) * | 2024-06-17 | 2024-07-19 | 广东永成机电科技有限公司 | Double-impeller centrifugal blower with adjustable air inlet quantity |
| CN118517435A (en) * | 2024-07-19 | 2024-08-20 | 佛山市南海九洲普惠风机有限公司 | High-efficient low noise centrifugal fan |
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