CN116241502B - High-flow high-efficiency multi-wing forward centrifugal fan - Google Patents
High-flow high-efficiency multi-wing forward centrifugal fan Download PDFInfo
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- CN116241502B CN116241502B CN202310524419.6A CN202310524419A CN116241502B CN 116241502 B CN116241502 B CN 116241502B CN 202310524419 A CN202310524419 A CN 202310524419A CN 116241502 B CN116241502 B CN 116241502B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/422—Discharge tongues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention relates to the technical field of ventilation equipment, in particular to a high-flow high-efficiency multi-wing forward centrifugal fan, which comprises a volute, an impeller arranged in an inner cavity of the volute, an air inlet ring arranged on the side wall of the volute and extending into the inner cavity of the volute, wherein the air inlet ring is coaxial with the impeller, the impeller is a multi-wing forward impeller, the diameter of an outer circumference surrounded by the outer ends of all blades of the impeller is phi 1, the diameter of an inner circumference surrounded by the inner ends of all blades of the impeller is phi 2, the diameter of an air inlet ring is phi 3, the width of the inner cavity of the volute is L1, the width of the impeller is L2, and the amount of the air inlet ring extending into the inner cavity from the side wall is L3; when phi 1 is 450, phi 2 is 350-370, phi 3 is 355-375, phi 3 is greater than phi 2, L1 is 300-320, L2 is 170-200, and L3 is 90-110; a gap exists between the air inlet ring and the impeller in the axial direction of the impeller, and the width L4 of the gap is 8-9. The multi-wing forward centrifugal fan still has higher static pressure at high flow rate.
Description
Technical Field
The invention relates to the technical field of ventilation equipment, in particular to a high-flow high-efficiency multi-wing forward centrifugal fan.
Background
The multi-wing forward centrifugal fan is a fan type commonly used in use scenes such as kitchen oil smoke extraction, factory ventilation, matched environment-friendly equipment and the like. In recent years, with the development of technology and the increasing requirements of society on energy conservation and environmental protection, the performance requirements on the multi-wing forward centrifugal fan are also increasing.
At present, when the multi-wing forward centrifugal fan is applied to a scene of a smoke exhaust ventilator, the problem of insufficient static pressure when the multi-wing forward centrifugal fan with the traditional structure has large flow is generally solved, and then the static pressure efficiency is also reduced. Because the existing range hood is provided with large flow, the fan generally has the performance characteristic that when the flow is increased, the total pressure and the static pressure are reduced, and when the static pressure is reduced to a critical point, the suction force is too small, and the effect of extracting the oil smoke is not achieved, so that the flow is not significant, namely, the minimum critical point of the static pressure can restrict the maximum flow which can be achieved by the range hood. In addition, the width of the impeller (i.e. the length of the impeller in the axial direction) of the multi-wing forward centrifugal fan with the traditional structure is wider, so that the weight of the impeller is heavier, more energy is required for driving the impeller to rotate, and the energy consumption of the smoke exhaust ventilator is higher; moreover, the length of the blades is longer due to the wider impeller, so that the thickness of the blades needs to be increased to increase the strength in order to avoid deformation of the blades, the weight of the impeller is further increased, and the problem of high energy consumption of the smoke exhaust ventilator is further aggravated.
In summary, the existing multi-wing forward centrifugal fan has a large improvement space.
Disclosure of Invention
The invention aims to provide a high-flow high-efficiency multi-wing forward centrifugal fan, and aims to solve the problem that the static pressure of the multi-wing forward centrifugal fan in the prior art is insufficient during high flow.
In order to achieve the aim, the invention provides a high-flow high-efficiency multi-wing forward centrifugal fan, which comprises a volute, an impeller arranged in an inner cavity of the volute, and an air inlet ring arranged on the side wall of the volute and extending into the inner cavity of the volute, wherein the air inlet ring is coaxial with the impeller, the impeller is a multi-wing forward impeller, the diameter of an outer circumference surrounded by the outer ends of all blades of the impeller is phi 1, the diameter of an inner circumference surrounded by the inner ends of all blades of the impeller is phi 2, the diameter of an air inlet ring is phi 3, the width of the inner cavity of the volute is L1, the width of the impeller is L2, and the amount of the air inlet ring extending into the inner cavity from the side wall is L3; when phi 1 is 450, phi 2 is 350-370, phi 3 is 355-375, phi 3 is greater than phi 2, L1 is 300-320, L2 is 170-200, and L3 is 90-110; a gap exists between the air inlet ring and the impeller in the axial direction of the impeller, and the width L4 of the gap is 8-9.
Further, when φ 1 is 450, φ 2 is 360.9, φ 3 is 365, L1 is 310, L2 is 184, L3 is 100, and L4 is 8.5.
Further, the planar deployment structure of the blade comprises a leading edge, a trailing edge, a first side connected between the first ends of the leading edge and the trailing edge, and a second side connected between the second ends of the leading edge and the trailing edge, the first side being a side closer to the air inlet ring, the second side being a side further from the air inlet ring, a chamfer being provided between the first side and the leading edge.
Further, the included angle 1 between the contour line of the chamfer and the front edge is 140-170 degrees, and the width L5 of the chamfer in the axial direction of the impeller is 8-13.
Further, < 1 > is 155 °, and L5 is 10.5.
Further, the blades are arc sheet metal type blades, the arc radius R1 of the blades is 25-30, the air inlet angle 2 of the blades is 50-70 degrees, and the air outlet angle 3 of the blades is 155-172 degrees.
Further, R1 is 27.9, 2 is 60 degrees, 3 is 165 degrees, and the number of blades is 42.
Further, the cross section of the air inlet ring comprises a connecting section, an arc section and a reducing section, wherein the connecting section is used for being connected with the volute casing, the direction of the center of the air inlet ring is the inner side, the radial direction of the air inlet ring is the outer side, the connecting section extends along the radial direction of the air inlet ring, the arc section is connected at the inner tail end of the connecting section, the reducing section is connected at the inner tail end of the arc section, the two ends of the arc section are respectively tangent with the connecting section and the reducing section, the radius R2 of the arc section is 40-50, and the included angle 4 between the reducing section and the connecting section is 90-96 degrees.
Further, R2 is 45 and 4 is 93.
Further, the molded line of 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 connected in a tangent mode; the center of the impeller is used as the origin of coordinates to establish a rectangular coordinate system, when the second diffusion straight line segment is positioned in the second quadrant and parallel to the X axis, and phi 1 is 450, the radius R3 of the volute tongue segment is 20.7, and the center of the first arc segment is 0 1 Coordinates (-23.7 ), central angle of 31 deg. and radius R4 of 287.1, center 0 of the second arc segment 2 The coordinates are (27.9, -27.9), the central angle is 90 degrees, the radius R5 is 340.7, and the center of the third arc segment is 0 3 The coordinates are (32.9 ), the central angle is 90 degrees, the radius R6 is 399.5, and the center of the fourth arc segment is 0 4 The coordinates are (-38.8, 38.8), the central angle is 90 degrees, the radius R7 is 473.2, and the included angle between the first diffusion straight line segment and the first arc line segment is 32 degrees.
Compared with the prior art, the high-flow high-efficiency multi-wing forward centrifugal fan provided by the invention has the advantages that the width of the impeller is reduced, the amount of the air inlet ring extending into the inner cavity of the volute is correspondingly increased, and through tests, the improvement can obtain the effects that the absolute value of static pressure and the static pressure efficiency are still higher when the flow is larger, and the problem that the static pressure of the multi-wing forward centrifugal fan in the prior art is insufficient when the flow is large is solved, namely effective suction operation can be still carried out when the flow is large; and the reasonable relative width among all the parts and the clearance value between the air inlet ring and the impeller ensure that the gas injection vortex phenomenon generated in the inner cavity is not too prominent in the small flow, so that the fan efficiency is not too low, namely, the effective suction operation can be still carried out in the small flow. Based on the characteristics of the wider working range, when the high-flow high-efficiency multi-wing forward centrifugal fan is used for a range hood, the performance parameter requirements required by the range hood can be met no matter in high flow or low flow, so that the range hood also has the wider working range and meets more application fields Jing Xuqiu; in addition, the width of the impeller is shortened, so that the self weight of the impeller is reduced, the strength of the impeller is improved after the impeller is shortened, the impeller can be made thinner, the total weight of the impeller can be further reduced, the energy required for driving the impeller to rotate is reduced, and the energy consumption of the high-flow high-efficiency multi-wing forward centrifugal fan is reduced.
Drawings
FIG. 1 is a schematic diagram of a high flow high efficiency multi-wing forward centrifugal fan of the present invention;
FIG. 2 is a schematic structural view of an impeller;
FIG. 3 is a side cross-sectional view of an impeller;
FIG. 4 is a plan view of the blade in an expanded configuration;
FIG. 5 is a side cross-sectional view of an air intake collar;
fig. 6 is a schematic structural view of the scroll casing.
Reference numerals illustrate:
1. a volute; 11. a first diffusion straight line segment; 12. a volute tongue section; 13. a first arc segment; 14. a second arc segment; 15. a third arc segment; 16. a fourth arc segment; 17. a second diffusion straight line segment;
2. an impeller; 21. a blade; 211. a leading edge; 212. a first side; 213. chamfering;
3. an air inlet ring; 31. a connection section; 32. a circular arc section; 33. and (5) reducing the diameter section.
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.
The invention provides a high-flow high-efficiency multi-wing forward centrifugal fan, which is shown in figures 1 to 6 and comprises a volute 1, an impeller 2 arranged in an inner cavity of the volute 1, an air inlet ring 3 arranged on the side wall of the volute 1 and extending into the inner cavity of the volute 1, wherein the air inlet ring 3 is coaxial with the impeller 2, the impeller 2 is a multi-wing forward impeller, the diameter of an outer circumference surrounded by the outer ends of all blades 21 of the impeller 2 is phi 1, the diameter of an inner circumference surrounded by the inner ends of all blades 21 of the impeller 2 is phi 2, the diameter of the air inlet ring 3 is phi 3, the width (the direction pointed by the width) of the inner cavity of the volute 1 is parallel to the axial direction of the impeller) is L1, the width of the impeller 2 is L2, and the amount of the air inlet ring 3 extending into the inner cavity from the side wall is L3; when phi 1 is 450, phi 2 is 350-370, phi 3 is 355-375, phi 3 is greater than phi 2, L1 is 300-320, L2 is 170-200, and L3 is 90-110; a gap exists between the air inlet ring 3 and the impeller 2 in the axial direction of the impeller 2, and the width L4 of the gap is 8-9.
The invention adopts a dimensionless mode to explain the structural parameters of the high-flow high-efficiency multi-wing forward 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.
Based on the structural arrangement, the high-flow high-efficiency multi-wing forward centrifugal fan reduces the width of the impeller 2, correspondingly increases the amount of the air inlet ring 3 extending into the inner cavity of the volute 1, and tests prove that the improvement can obtain the effect that the absolute value of static pressure and the static pressure efficiency are still higher when the flow rate is larger, and solve the problem that the static pressure of the multi-wing forward centrifugal fan in the prior art is insufficient when the flow rate is large, namely, the efficient suction operation can be still carried out when the flow rate is large; in addition, the reasonable relative width among all the components and the clearance value between the air inlet ring 3 and the impeller 2 ensure that the air injection vortex phenomenon generated in the inner cavity is not too prominent in the case of small flow, thus ensuring that the fan efficiency is not too low, namely, the effective pumping operation can be still carried out in the case of small flow. It is found that when the air inlet ring 3 stretches into the inner cavity excessively, air injection vortex is generated under the condition of small flow due to the fact that the air speed is too low, the efficiency of the fan is reduced rapidly, and the static pressure of the air inlet ring 3 stretching into the inner cavity is improved through reasonable arrangement of the air inlet ring 3, and the situation that the efficiency of the fan is low under the condition of small flow is avoided.
Based on the characteristics of the wider working range, when the high-flow high-efficiency multi-wing forward centrifugal fan is used for a range hood, the performance parameter requirements required by the range hood can be met no matter in high flow or low flow, so that the range hood also has the wider working range and meets more application fields Jing Xuqiu; in addition, the width of the impeller 2 is shortened, so that the self weight of the impeller is reduced, meanwhile, the strength of the impeller 21 is improved after the impeller 21 is shortened, the impeller 21 can be made thinner, the total weight of the impeller 2 can be further reduced, the energy required for driving the impeller 2 to rotate is reduced, and the energy consumption of the high-flow high-efficiency multi-wing forward centrifugal fan is reduced.
In this embodiment, the preferred value is when φ 1 is 450, φ 2 is 360.9, φ 3 is 365, L1 is 310, L2 is 184, L3 is 100, and L4 is 8.5.
In the present embodiment, as shown in fig. 4, the planar deployment structure of the blade 21 includes a leading edge 211, a trailing edge, a first side 212 connected between the leading edge 211 and a first end of the trailing edge, and a second side connected between the leading edge 211 and a second end of the trailing edge, the first side 212 being a side closer to the air intake 3, the second side being a side farther from the air intake 3, and a chamfer 213 being provided between the first side 212 and the leading edge 211. Based on the chamfer 213 structure, the weight of the impeller 2 can be further reduced, and the energy consumption is reduced; moreover, the provision of chamfer 213 also enables the interface of first side 212 and leading edge 211 to be devoid of sharp corners, avoiding personnel injury in special situations. Preferably, the angle 1 between the contour of the chamfer 213 and the front edge 211 is 140-170 °, and the width L5 of the chamfer 213 in the axial direction of the impeller 2 is 8-13. A further preferred value is < 1 > 155℃and L5 is 10.5.
In the embodiment, the blade 21 is an arc sheet metal type blade, the arc radius R1 of the blade 21 is 25-30, the air inlet angle 2 of the blade 21 is 50-70 degrees, and the air outlet angle 3 of the blade 21 is 155-172 degrees. The preferred value is R1 is 27.9, 2 is 60, 3 is 165, and the number of blades 21 is 42. Through testing, the blade setting under the parameter can obtain the best performance in combination with other parameter settings provided by the previous step.
In this embodiment, as shown in fig. 5, the cross section of the air intake ring 3 includes a connection section 31, an arc section 32 and a diameter reduction section 33, the connection section 31 is used for being connected with the volute 1, the direction in which the center of the air intake ring 3 is located is taken as the inner side, the radial direction of the air intake ring 3 is taken as the outer side, the connection section 31 extends along the radial direction of the air intake ring 3, the arc section 32 is connected at the inner end of the connection section 31, the diameter reduction section 33 is connected at the inner end of the arc section 32, two ends of the arc section 32 are tangent to the connection section 31 and the diameter reduction section 33 respectively, the radius R2 of the arc section 32 is 40-50, and the included angle 4 between the diameter reduction section 33 and the connection section 31 is 90-96 °. Based on the above-mentioned angle setting for the diameter of inlet ring 3 is from interior outside to being the gradual increase, and this is favorable to inhaling more air, moreover, reducing section 33 is the shape of frustum and has the trend of gathering together towards the center when making the air current get into the inner chamber, can just be dispersed by centrifugal effect in the position that is close to impeller 2 chassis after getting into the inner chamber, can exert the centrifugal effect everywhere of blade 21 more fully, and also can reduce the influence that the existence of above-mentioned chamfer 213 caused. The preferred value is R2 is 45 and 4 is 93.
In this embodiment, as shown in fig. 6, the profile of the volute 1 includes a first diffusion straight-line segment 11, a volute tongue segment 12, a first arc segment 13, a second arc segment 14, a third arc segment 15, a fourth arc segment 16, and a second diffusion straight-line segment 17 that are sequentially connected in a tangent manner. 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 segment 17 is located in the second quadrant and parallel to the X-axis, and phi 1 is 450, the radius R3 of the volute tongue segment 12 is 20.7, and the center of the first arc segment 13 is 0 1 Coordinates (-23.7 ), central angle of 31 deg. and radius R4 of 287.1, a second arc segment 1Center of circle 0 of 4 2 Coordinates (27.9, -27.9), central angle 90 deg. and radius R5 340.7, center 0 of third arc segment 15 3 The coordinates are (32.9 ), the central angle is 90 DEG and the radius R6 is 399.5, the center 0 of the fourth arc segment 16 4 The coordinates (-38.8, 38.8), the central angle of 90 degrees and the radius R7 of 473.2, and the included angle between the first diffusion straight line segment 11 and the first arc line segment 13 is 32 degrees. Through testing, the volute setting under the parameter can obtain the best performance in combination with other parameter settings provided by the above.
For the verification of this example, a conventional 11-62-4.5A multi-wing centrifugal fan was selected as a comparative example, and the impeller diameter of the 11-62-4.5A multi-wing centrifugal fan was 450mm. Correspondingly, the preferred structural parameters provided by the embodiment are combined with the diameter phi 1 of the peripheral circle of the impeller 2 to be 450mm, so that the high-flow high-efficiency multi-wing forward centrifugal fan corresponding to the embodiment is manufactured. The comparative example and the present example were subjected to performance test, and the test results were converted into prescribed test conditions of a solution at an atmospheric pressure of 101325Pa, an atmospheric temperature of 20℃and a medium density of 1.2 kg/m.
The comparative examples gave the test data shown in table 1.
TABLE 1
The present example yielded test data as shown in table 2.
TABLE 2
As can be seen from the test data of the comparative example, when the volume flow is 9966.4m 3 At/h, the static pressure is still 320.45Pa, when the volume flow reaches 10786 m 3 At/h, the static pressure drops sharply to 234.74Pa, with a static efficiency of only 17.274%; for the range hood, when the static pressure is lower than 260Pa or the static efficiency is lower than 20%, the effect of exhausting the oil smoke is not achieved, and thus the comparative example is not given furtherTest data at large volume flows. It is believed that the comparative example has a maximum working volume flow of about 10000m 3 And/h. As can be seen from the test data of the present embodiment, when the volume flow is 10023m 3 At/h, the static pressure is 491.15Pa, which is significantly higher than that of the comparative example; and when the volume flow reaches 12153 m 3 At/h, the corresponding static pressure is 291.78Pa, the static efficiency is 20.029%, and the oil smoke can be extracted, so that the maximum working volume flow of the embodiment is more than 12000m 3 And/h. Through the comparison, the high-flow high-efficiency multi-wing forward centrifugal fan can be obtained, and compared with the prior art, the volume flow of the high-flow high-efficiency multi-wing forward centrifugal fan can be improved by 10% -20%. Moreover, as can be seen by comparison, the fan efficiency of this embodiment is 9% -13% higher than that of the comparative example, i.e., the fan efficiency of this embodiment is higher, at similar impeller powers. Furthermore, the A level of this example is 1-3dB lower than the A level of the comparative example, i.e., this example is quieter, at similar volumetric flows.
In summary, various performance parameters of the high-flow high-efficiency multi-wing forward centrifugal fan are improved to different degrees compared with the prior art, and the high-efficiency multi-wing forward centrifugal fan can meet the increasing performance requirements of people when applied to smoke exhaust hoods; of course, based on the design thought of the high-flow high-efficiency multi-wing forward centrifugal fan provided by the invention, the fan can be used in other technical fields and falls into the protection scope of the invention.
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 (5)
1. The utility model provides a high-flow high efficiency multi-wing forward centrifugal fan, includes the spiral case, sets up the impeller in the inner chamber of spiral case, sets up at the lateral wall of spiral case and stretches into the air inlet circle of the inner chamber of spiral case, and the air inlet circle is coaxial with the impeller, and the impeller is multi-wing forward impeller, its characterized in that:
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 diameter of the air inlet ring is phi 3, the width of the inner cavity of the volute is L1, the width of the impeller is L2, and the amount of the air inlet ring extending into the inner cavity from the side wall is L3; when phi 1 is 450, phi 2 is 350-370, phi 3 is 355-375, phi 3 is greater than phi 2, L1 is 300-320, L2 is 170-200, and L3 is 90-110; a gap exists between the air inlet ring and the impeller in the axial direction of the impeller, and the width L4 of the gap is 8-9;
the plane unfolding structure of 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 second ends of the front edge and the tail edge, wherein the first side edge is a side edge close to the air inlet ring, the second side edge is a side edge far away from the air inlet ring, and a chamfer is arranged between the first side edge and the front edge; the included angle 1 between the contour line of the chamfer and the front edge is 140-170 degrees, and the width L5 of the chamfer in the axial direction of the impeller is 8-13;
the blades are arc sheet metal blades, the arc radius R1 of the blades is 25-30, the air inlet angle 2 of the blades is 50-70 degrees, and the air outlet angle 3 of the blades is 155-172 degrees;
the cross section of the air inlet ring comprises a connecting section, an arc section and a reducing section, wherein the connecting section is used for being connected with a volute casing, the direction of the center of the air inlet ring is taken as the inner side, the radial direction of the air inlet ring is taken as the outer side, the connecting section extends along the radial direction of the air inlet ring, the arc section is connected at the inner tail end of the connecting section, the reducing section is connected at the inner tail end of the arc section, the two ends of the arc section are respectively tangent with the connecting section and the reducing section, the radius R2 of the arc section is 40-50, and the included angle 4 between the reducing section and the connecting section is 90-96 degrees;
the molded line of 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; establishing a rectangular coordinate system by taking the center of a circle of the impeller as the origin of coordinatesWhen the second diffusion straight line segment is positioned in the second quadrant and parallel to the X axis, and phi 1 is 450, the radius R3 of the volute tongue segment is 20.7, and the circle center of the first arc segment is 0 1 Coordinates (-23.7 ), central angle of 31 deg. and radius R4 of 287.1, center 0 of the second arc segment 2 The coordinates are (27.9, -27.9), the central angle is 90 degrees, the radius R5 is 340.7, and the center of the third arc segment is 0 3 The coordinates are (32.9 ), the central angle is 90 degrees, the radius R6 is 399.5, and the center of the fourth arc segment is 0 4 The coordinates are (-38.8, 38.8), the central angle is 90 degrees, the radius R7 is 473.2, and the included angle between the first diffusion straight line segment and the first arc line segment is 32 degrees.
2. The high flow high efficiency multi-wing forward centrifugal fan according to claim 1, wherein: when φ 1 is 450, φ 2 is 360.9, φ 3 is 365, L1 is 310, L2 is 184, L3 is 100, and L4 is 8.5.
3. The high flow high efficiency multi-wing forward centrifugal fan according to claim 1, wherein: and angle 1 is 155 degrees, and L5 is 10.5.
4. The high flow high efficiency multi-wing forward centrifugal fan according to claim 1, wherein: r1 is 27.9, the angle 2 is 60 degrees, the angle 3 is 165 degrees, and the number of blades is 42.
5. The high flow high efficiency multi-wing forward centrifugal fan according to claim 1, wherein: r2 is 45 and 4 is 93 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310524419.6A CN116241502B (en) | 2023-05-11 | 2023-05-11 | High-flow high-efficiency multi-wing forward centrifugal fan |
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| JP4581992B2 (en) * | 2004-07-14 | 2010-11-17 | ダイキン工業株式会社 | Centrifugal blower and air conditioner equipped with the centrifugal blower |
| CN101201056A (en) * | 2006-12-13 | 2008-06-18 | 张一鸣 | Centrifugal fan with built-in purifying means |
| WO2008072558A1 (en) * | 2006-12-14 | 2008-06-19 | Panasonic Corporation | Centrifugal impeller and centrifugal blower using it |
| JP5775515B2 (en) * | 2010-05-26 | 2015-09-09 | 株式会社ヴァレオジャパン | Ventilation unit for vehicles |
| JP5593941B2 (en) * | 2010-08-06 | 2014-09-24 | ダイキン工業株式会社 | Sirocco fan |
| CN203420908U (en) * | 2013-08-05 | 2014-02-05 | 株洲联诚集团有限责任公司 | Traction ventilator used for double-flow-system electric locomotive |
| WO2018040015A1 (en) * | 2016-08-31 | 2018-03-08 | 广东泛仕达机电有限公司 | Volute housing and forward multi-blade centrifugal fan |
| CN111878424A (en) * | 2020-08-25 | 2020-11-03 | 中山市高途五金制品有限公司 | Large-air-volume volute fan |
| CN214742211U (en) * | 2021-03-26 | 2021-11-16 | 浙江尔格科技股份有限公司 | High-flow high-efficiency centrifugal fan |
| CN214788140U (en) * | 2021-06-09 | 2021-11-19 | 无锡曲速智能科技有限公司 | Multi-wing centrifugal fan and wind power equipment |
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