CN214221633U - Fan head assembly and fan - Google Patents
Fan head assembly and fan Download PDFInfo
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- CN214221633U CN214221633U CN202023352624.XU CN202023352624U CN214221633U CN 214221633 U CN214221633 U CN 214221633U CN 202023352624 U CN202023352624 U CN 202023352624U CN 214221633 U CN214221633 U CN 214221633U
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Abstract
The utility model provides a machine head component of a fan and the fan, wherein the machine head component of the fan comprises a grid net and a fan blade, the fan blade is provided with a plurality of blades, and the grid net comprises a plurality of grid bars which are distributed radially; the grid net comprises a rear net and a front net, the fan blade is arranged between the rear net and the front net, at least each grid strip of the rear net is bent towards the same direction, and the bending direction is opposite to the rotating direction of the blade of the fan blade. The grid strips of the rear net are arranged into a curved shape which is curved towards the same direction, and the curved direction is opposite to the rotating direction of the blades of the fan blade, so that the broadband noise in the running process of the fan blade can be reduced while the distance between the rear net and the fan blade is not required to be elongated, the pneumatic noise is further reduced, and the integral noise of the fan is reduced.
Description
Technical Field
The utility model relates to the technical field of household appliances, concretely relates to aircraft nose subassembly and fan of fan.
Background
The noise generated by the fan in the operation process is influenced by multiple factors, and according to the structure and the operation characteristics of the fan, the fan noise is generally divided into pneumatic noise, mechanical noise and electromagnetic noise, wherein along with the improvement of the motor technology, the mechanical noise and the electromagnetic noise generated by the motor are well controlled, and the pneumatic noise becomes the main factor of the operation noise of the fan blades.
The pneumatic noise is generally divided into discrete noise and broadband noise, wherein the discrete noise is generally in great relation with the rotation of the fan blade, the fan blade is driven by the motor to generate high-speed rotating airflow, and the airflow can generate multi-band rotating discrete noise when periodically impacting the fan, the air duct, the fan blade and the air duct mesh enclosure. The rotating noise is difficult to weaken due to the influence of the wind blades, but the rotating noise is formed by combining multiple frequency bands, the sound is stable, and the sound quality is normal.
The broadband noise is generally caused by the falling of a blade trailing edge vortex, a blade top gap vortex and a high-speed vortex in an air duct in the operation process of a fan blade, and can be superposed on the discrete noise of a certain frequency band due to the interaction between the high-speed vortex on the blade surface and the wall surface in the air duct and between the front and rear grids, so that the peak noise of the whole machine is increased, and the discrete noise with higher loudness can be heard when the total tone quality of the air duct is expressed.
Generally, in the process of high-speed operation, the rotating noise of the airflow accounts for most of the total sound pressure, the sound quality is normal, and no noise exists.
At present, a circulating fan in the market is generally designed into an outer concave type rear net by increasing the air inlet size, a motor is arranged on the rear net, and the distance between a fan blade and the rear net is lengthened to reduce the vortex noise of the fan blade, however, the longitudinal size of the whole circulating fan is increased, and the whole structure is too bulky.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the great defect of fan size that can reduce the wide band noise among the prior art to a aircraft nose subassembly and the fan of fan that reduce the complete machine size when can reduce the wide band noise is provided.
The utility model provides a machine head component of a fan, which comprises a grid net and a fan blade, wherein the fan blade is provided with a plurality of blades, and the grid net comprises a plurality of grid bars which are distributed radially; the grid net comprises a rear net and a front net, the fan blade is arranged between the rear net and the front net, at least each grid strip of the rear net is bent towards the same direction, and the bending direction is opposite to the rotating direction of the blade of the fan blade.
Optionally, each grid strip of the front net is bent towards the same direction, and the bending direction is opposite to the rotation direction of the blades of the fan blades.
Optionally, the air inlet side of the blade is a blade front edge, and the stagger angle between the blade front edge and the grid bars is alpha; in the process that the front edge of the fan blade extends from one end far away from the center of the fan blade to the center of the fan blade, alpha is gradually increased, the increment of the staggered angle alpha between two adjacent grid strips and the front edge of the fan blade is gamma, and gamma is more than or equal to 3 degrees and less than or equal to 8 degrees.
Optionally, an intersection angle between one end of the front edge of the fan blade, which is far away from the center of the fan blade, and the grid bars is α 1, and α 1 is greater than or equal to 80 degrees and less than or equal to 100 degrees.
Optionally, α 1 is 90 °.
Optionally, the air outlet side of the fan blade is a fan blade trailing edge, and an intersection angle between the fan blade trailing edge and the grid bars is β; in the process that the tail edge of the fan blade extends from one end far away from the center of the fan blade to the center of the fan blade, beta is gradually reduced, the reduction of the staggered angle beta between every two adjacent grid strips and the tail edge of the fan blade is delta, and delta is larger than or equal to 3 degrees and smaller than or equal to 8 degrees.
Optionally, an intersection angle between one end of the front edge of the fan blade, which is far away from the center of the fan blade, and the grid bars is β 1, and β 1 is greater than or equal to 80 degrees and less than or equal to 100 degrees.
Optionally, β 1 is 90 °.
Optionally, the thickness of the grid bars in the bending direction is d0, then d0 satisfies that d0 is less than or equal to 1mm and less than or equal to 4 mm.
Optionally, d0 is 2.2 mm.
Optionally, the distance between the ends, far away from the center of the fan blade, of two adjacent grid bars is L1, and then L1 is satisfied, where L1 is greater than or equal to 6mm and less than or equal to 8.5 mm.
Optionally, L1 ═ 7.7 mm.
Optionally, the distance between the ends of two adjacent grid bars close to the center of the fan blade is L2, and then L2 is satisfied, where L2 is greater than or equal to 2mm and less than or equal to 7 mm.
Optionally, L2 ═ 5 mm.
Optionally, the utility model provides a head assembly of fan still includes the wind channel structure, the wind channel structure has air inlet end, air-out end, and communicates the air inlet end with the wind channel of air-out end, the back net with the air inlet end is connected, the preceding net with the air-out end is connected.
Optionally, the utility model provides a head assembly of fan still includes the drive fan blade pivoted motor, the motor is located in the wind channel.
Optionally, the utility model provides a head assembly of fan still includes:
the motor bracket is arranged in the air duct and is provided with the motor;
and the guide vane ribs are radially arranged in the air duct and are connected with the motor support and the cavity wall of the air duct.
Optionally, each guide vane rib is bent towards the same direction, and the bending direction is opposite to the rotation direction of the blade of the fan blade.
Optionally, the guide vane rib projects onto the grid bars to coincide with the grid bars.
Optionally, the guide vane ribs have three or four and are evenly distributed along the circumferential direction of the air duct structure.
Optionally, an annular air guide surface is arranged on the rear net, a flow guide surface is arranged on the cavity wall of the air duct close to one end of the rear net, and the air guide surface and the flow guide surface are in smooth transition.
Optionally, the maximum inner diameter of the air guide surface is D2, and the minimum inner diameter of the air guide surface is D1, so that the requirement between D2 and D1 is that D2 is not less than 1.05 × D1 and not more than 1.5 × D1.
Optionally, D2 ═ 1.2 × D1.
The utility model also provides a fan, including the aircraft nose subassembly of foretell fan.
Optionally, the fan is a circulation fan.
The utility model discloses technical scheme has following effect:
1. the utility model provides a machine head component of a fan, which comprises two grid nets and a fan blade arranged between the two grid nets, wherein the fan blade is provided with a plurality of blades, and the grid nets comprise a plurality of grid strips which are distributed radially; the two grid nets are respectively a rear net and a front net, at least each grid strip of the rear net is bent towards the same direction, and the bending direction is opposite to the rotating direction of the blades of the fan blades. The grid strips of the rear net are arranged into a curved shape which is curved towards the same direction, and the curved direction is opposite to the rotating direction of the blades of the fan blade, so that the broadband noise in the running process of the fan blade can be reduced while the distance between the rear net and the fan blade is not required to be elongated, the pneumatic noise is further reduced, and the integral noise of the fan is reduced.
2. The utility model provides a head assembly of fan, each grid strip of preceding net is crooked towards same direction, and the rotation of the blade of crooked direction and fan blade is opposite. Therefore, the broadband noise in the running process of the fan blade can be further reduced, and the overall noise of the fan can be further reduced.
3. The utility model provides a machine head component of a fan, the air inlet side of the blade is a blade front edge, and the stagger angle between the blade front edge and the grid bars is alpha; in the process that the front edge of the fan blade extends from one end far away from the center of the fan blade to the center of the fan blade, alpha is gradually increased, the increment of the staggered angle alpha between two adjacent grid strips and the front edge of the fan blade is gamma, and gamma is more than or equal to 3 degrees and less than or equal to 8 degrees. Therefore, broadband noise in the running process of the fan blade can be further reduced, and the integral noise of the fan can be further reduced; meanwhile, the air quantity is improved, and the energy efficiency is increased.
4. The utility model provides a head assembly of fan, the fan blade front edge keep away from the one end at fan blade center with stagger angle between the grid strip is alpha 1, then alpha 1 satisfies that alpha 1 is less than or equal to 100 that is less than or equal to 80. This may have a better noise reduction effect.
5. The utility model provides a head assembly of fan, the air-out side of fan blade is the fan blade trailing edge, the stagger angle between the fan blade trailing edge and the grid strip is beta; in the process that the tail edge of the fan blade extends from one end far away from the center of the fan blade to the center of the fan blade, beta is gradually reduced, the reduction of the staggered angle beta between every two adjacent grid strips and the tail edge of the fan blade is delta, and delta is larger than or equal to 3 degrees and smaller than or equal to 8 degrees. Therefore, broadband noise in the running process of the fan blade can be further reduced, and the integral noise of the fan can be further reduced; meanwhile, the air quantity is improved, and the energy efficiency is increased.
6. The utility model provides a head assembly of fan, the one end that the fan blade center was kept away from to the fan blade leading edge with stagger angle between the grid strip is beta 1, then beta 1 satisfies that beta 1 is less than or equal to 80 and is less than or equal to 100. This may have a better noise reduction effect.
7. The utility model provides a head assembly of fan still includes the drive fan blade pivoted motor, the motor is located in the wind channel. By arranging the motor in the air duct, compared with the situation that the motor is arranged outside the air duct, the distance between the rear net and the fan blades can be shortened, and the size of the whole fan is reduced.
8. The utility model provides a head assembly of fan, each the stator rib is crooked towards same direction, and the rotation of the blade of crooked direction and fan blade is opposite. This reduces the power consumption of the motor and thus makes the fan more energy efficient.
9. The utility model provides a head assembly of fan, the stator rib is in projection on the grid strip with the coincidence of grid strip. Therefore, the power consumption of the motor can be further reduced, and the fan is more energy-saving.
10. The utility model provides a head assembly of fan, the stator rib has three or four, and prolongs the circumference evenly distributed of wind channel structure. Therefore, the support for the motor arranged on the motor support can be met, and the influence on the air outlet effect caused by the air blockage due to the excessive guide vane ribs can be avoided.
11. The utility model provides a machine head component of fan, the back net is equipped with the wind-guiding surface that is annular, the wall of cavity that the wind channel is close to one end of the back net is equipped with the drainage surface, the wind-guiding surface and the drainage surface are in smooth transition; the maximum inner diameter of the air guide surface is D2, and the minimum inner diameter of the air guide surface is D1, so that the requirement between D2 and D1 is met, and D2 is not less than 1.05X D1 and not more than 1.5X D1. Therefore, the air inlet pressure can be reduced, the air inlet amount of the fan is increased, and the vortex broadband noise can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a longitudinal sectional view of a fan provided in a first embodiment of the present invention;
FIG. 2 is an exploded perspective view of a head assembly of the fan shown in FIG. 1;
FIG. 3 is a left side view of the fan shown in FIG. 1;
FIG. 4 is a right side view of the fan shown in FIG. 1;
FIG. 5 is a schematic view of a head assembly of the fan shown in FIG. 4;
FIG. 6 is a schematic view of a head assembly of the fan shown in FIG. 3;
FIG. 7 is a cross-sectional schematic view of the head assembly of the fan shown in FIG. 2 in an assembled state;
FIG. 8 is a perspective view of the air duct structure of the head assembly of the fan shown in FIG. 2 with the motor installed;
FIG. 9 is a schematic cross-sectional perspective view of the air duct structure shown in FIG. 8 with a rear net installed;
description of reference numerals:
1-fan blade, 11-fan blade front edge, 12-fan blade tail edge, 2-grid strip, 31-rear net, 32-front net, 4-air channel structure, 41-air channel, 5-motor, 6-motor bracket, 7-guide blade rib, 8-air guide surface and 9-guide surface.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 9, the present embodiment provides a head assembly of a fan, including two grid nets and a fan blade 1 disposed between the two grid nets, where the fan blade 1 is provided with a plurality of blades, and the grid nets include a plurality of grid strips 2 radially distributed; the two grid nets are respectively a rear net 31 and a front net 32, at least each grid bar 2 of the rear net 31 is bent towards the same direction, and the bending direction is opposite to the rotating direction of the blades of the fan blade 1.
By arranging the grid strips 2 of the rear net 31 into a curved shape which is curved towards the same direction, and the curved direction is opposite to the rotating direction of the blades of the fan blade 1, the wide-frequency noise in the running process of the fan blade 1 can be reduced without lengthening the distance between the rear net 31 and the fan blade 1, and further the aerodynamic noise and the overall noise of the fan are reduced.
Each grid bar 2 of the front net 32 is bent towards the same direction, and the bending direction is opposite to the rotating direction of the blades of the fan blade 1. Therefore, the broadband noise in the operation process of the fan blade 1 can be further reduced, and the overall noise of the fan can be further reduced. As an alternative embodiment, the individual grid bars 2 of the front net 32 may also be straight bar-shaped.
The air inlet side of the blade is a blade front edge 11, and the staggered angle between the blade front edge 11 and the grid bars 2 is alpha; the front edge 11 of the fan blade takes the intersection point of the front edge 11 of the fan blade and the grid bar 2 as a tangent point to form a first tangent line, the front edge 2 of the fan blade takes the intersection point of the front edge 11 of the fan blade and the grid bar 2 as a tangent point to form a second tangent line, and the included angle between the first tangent line and the second tangent line is the intersection angle alpha of the front edge 11 of the fan blade and the grid bar 2 at the intersection point. In the process that the front edge 11 of the fan blade extends from one end far away from the center of the fan blade 1 to the center of the fan blade 1, alpha is gradually increased, the increment of the staggered angle alpha between two adjacent grid strips 2 and the front edge 11 of the fan blade is gamma, preferably gamma meets the requirement that gamma is not less than 3 degrees and not more than 8 degrees. Therefore, broadband noise in the running process of the fan blade 1 can be further reduced, and the overall noise of the fan can be further reduced; meanwhile, the air quantity is improved, and the energy efficiency is increased. For example, γ may be 3 ° or γ may be 8 °. In the present embodiment, γ is 5 °.
The stagger angle between one end of the front edge 11 of the fan blade far away from the center of the fan blade 1 and the grid bar 2 is alpha 1, and preferably, the alpha 1 meets the condition that the alpha 1 is more than or equal to 80 degrees and less than or equal to 100 degrees. This has a better noise reduction effect. For example, α 1 may be 80 ° or α 1 may be 100 °. In the present embodiment, α 1 is 90 °.
The air outlet side of the fan blade 1 is a fan blade tail edge 12, and the staggered angle between the fan blade tail edge 12 and the grid bar 2 is beta; namely, the blade tail edge 12 takes the intersection point of the blade tail edge 12 and the grid bar 2 as a tangent point to make a first tangent line, the blade tail edge 12 and the grid bar 2 takes the intersection point of the blade tail edge 12 and the grid bar 2 as a tangent point to make a second tangent line, and the included angle between the first tangent line and the second tangent line is the intersection angle beta of the blade tail edge 12 and the grid bar 2 at the intersection point. In the process that the tail edge 12 of the fan blade extends from one end far away from the center of the fan blade 1 to the center of the fan blade 1, beta is gradually reduced, the reduction of the staggered angle beta between two adjacent grid strips 2 and the tail edge 12 of the fan blade is delta, preferably delta meets the requirement that delta is larger than or equal to 3 degrees and smaller than or equal to 8 degrees. Therefore, broadband noise in the running process of the fan blade 1 can be further reduced, and the overall noise of the fan can be further reduced; meanwhile, the air quantity is improved, and the energy efficiency is increased. For example, δ may be 3 ° or δ may be 8 °. In the present embodiment, δ is 5 °.
The stagger angle between one end of the front edge 11 of the fan blade far away from the center of the fan blade 1 and the grid bar 2 is beta 1, and preferably, the beta 1 meets the condition that the beta 1 is more than or equal to 80 degrees and less than or equal to 100 degrees. This has a better noise reduction effect. For example, β 1 may be 80 °, or β 1 may be 100 °. In the present embodiment, β 1 is 90 °.
Actually measuring that two groups of grids with different curvatures are arranged under the same fan blade 1 of the same motor 5, the power of the straight grid fan is 27.5W, the peak noise is 32.42dB, the power of the curved grid fan is 20.7W, the peak noise is 26.57dB, and the specific test results are as follows:
as can be known from the above table, the fan provided in this embodiment is characterized in that the grille strips 2 of the rear net 31 and the grille strips 2 of the front net 32 are both bent in the same direction, and when the bending direction is opposite to the turning direction of the fan blade 1, and when α 1 is 90 °, γ is 5 °, β 1 is 90 °, δ is 5 °, peak noise thereof is significantly smaller than noise of the straight grille fan, and power is also significantly smaller than power of the straight grille fan, and the energy efficiency is higher than that of the straight grille fan, that is, the embodiment is compared with the straight grille fan, and not only noise reduction can be achieved, but also motor 5 power can be reduced, and the overall energy efficiency is improved.
The actual measurement shows that the relation between the bending degree of the air inlet and outlet grille and the fan blade 1 has larger influence on the air outlet performance of the whole machine, in order to ensure the air outlet performance of the whole machine, the thickness of the grille strip 2 in the bending direction is d0, preferably d0 meets the requirement that d0 is larger than or equal to 1mm and smaller than or equal to 4 mm. For example, d0 may be 1mm, or d0 may be 4 mm. In the present embodiment, d0 is 2.2 mm.
The distance between the ends, far away from the center of the fan blade 1, of the two adjacent grid bars 2 is L1, preferably L1 meets the requirement that L1 is not less than 6mm and not more than 8.5 mm. For example, L1 may be 6mm, or L1 may be 8.5 mm. In this embodiment, L1 is 7.7 mm.
The distance between the ends of the two adjacent grid bars 2 close to the center of the fan blade 1 is L2, preferably L2, and L2 is more than or equal to 2mm and less than or equal to 7 mm. For example, L2 may be 2mm, or L2 may be 7 mm. In this embodiment, L1 is 5 mm.
The head assembly of fan that this embodiment provided still includes wind channel structure 4, and wind channel structure 4 has air inlet end, air-out end, and communicates air inlet end and air-out 41 of end, and back net 31 is connected with the air inlet end, and preceding net 32 is connected with the air-out end.
Further, the fan comprises a motor 5 for driving the fan blade 1 to rotate, and the motor 5 is arranged in the air duct 41. By arranging the motor 5 in the air duct 41, compared with arranging the motor 5 outside the air duct 41, the distance between the rear net 31 and the fan blade 1 can be shortened, and the size of the whole fan is reduced. In other embodiments, the motor 5 may be disposed outside the air duct 41 and between the air duct structure 4 and the rear net 31.
The fan head assembly provided by the embodiment further comprises a motor bracket 6 and a plurality of guide vane ribs 7.
The motor bracket 6 is provided in the air duct 41, and the motor 5 is mounted.
The guide vane ribs 7 are radially arranged in the air duct 41 and are connected with the motor support 6 and the cavity wall of the air duct 41.
The guide vane ribs 7 may be straight or curved. In the present embodiment, each guide vane rib 7 is bent toward the same direction, and the bending direction is opposite to the rotation direction of the blade of the fan blade 1. Further, the guide vane ribs 7 in the present embodiment project on the grid bars 2 in coincidence with the grid bars 2. As an alternative embodiment, the projection of the guide vane rib 7 on the grate bars 2 may also be offset from the grate bars 2.
The simulation results of the air volume and the torque of the straight rod-shaped guide vane rib 7 and the bent rod-shaped guide vane rib 7 are as follows:
as can be seen from the above table, the guide vane ribs 7 in the shape of a curved rod in the present embodiment, and the projections of the guide vane ribs 7 on the grid bars 2 are overlapped with the grid bars 2, compared with the guide vane ribs 7 in the shape of a straight rod, the simulated air volume of the fan is basically unchanged, but the input power (the torque in the reference table) of the motor 5 is reduced by 6%, the power consumption of the whole machine is reduced, the energy efficiency is increased, and the efficiency of the whole machine is increased.
The specific number of the guide vane ribs 7 is not limited, and in this embodiment, four guide vane ribs 7 are provided and are uniformly distributed along the circumferential direction of the air duct structure 4. Therefore, the support for the motor 5 arranged on the motor support 6 can be met, and the influence on the air outlet effect caused by the air blockage due to the excessive quantity of the guide vane ribs 7 can be avoided. As an alternative embodiment, the guide vane rib 7 can also have three or five.
The rear net 31 is provided with an annular air guide surface 8, the wall of the air duct 41 close to one end of the rear net 31 is provided with a drainage surface 9, and the air guide surface 8 and the drainage surface 9 are in smooth transition.
The largest inner diameter of the air guide surface 8 is D2, and the smallest inner diameter of the air guide surface 9 is D1, so that the requirement between D2 and D1 is preferably satisfied, and 1.05 × D1 is not less than D2 is not less than 1.5 × D1. Therefore, the air inlet pressure can be reduced, the air inlet amount of the fan is increased, and the vortex broadband noise can be reduced. For example, D2 ═ 1.05 × D1 may be used, or D2 ═ 1.5 × D1 may be used. In this embodiment, D2 is 1.2 × D1.
The simulation results of the air volume and the torque of the air guide surface 8 and the air non-guide surface 8 are as follows:
| air volume (m3/min) | Torque of | |
| Net cover non-wind guide surface | 19.02 | 0.064 |
| The net cover has a wind-guiding surface | 20.94 | 0.063 |
It can be seen that when the net cover is provided with the air guide surface, the air volume is increased by 10%, the input power (torque in a reference table) of the motor is basically unchanged, the pressure of the air guide surface is improved, and the maximum eddy broadband noise is reduced.
The present embodiment further provides a fan, and specifically, the fan in the present embodiment is a circulation fan.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (18)
1. The machine head assembly of the fan is characterized by comprising a grid net and a fan blade (1), wherein the fan blade (1) is provided with a plurality of blades, and the grid net comprises a plurality of grid strips (2) which are distributed in a radial shape; the grille net comprises a rear net (31) and a front net (32), the fan blade (1) is arranged between the rear net (31) and the front net (32), at least each grille strip (2) of the rear net (31) bends towards the same direction, and the bending direction is opposite to the rotating direction of the blade of the fan blade (1).
2. The fan head assembly according to claim 1, wherein each grid bar (2) of the front net (32) is bent towards the same direction, and the bending direction is opposite to the rotation direction of the blades of the fan blade (1).
3. The head assembly of the fan according to claim 1 or 2, wherein the air inlet side of the blade is a blade leading edge (11), and the stagger angle between the blade leading edge (11) and the grid bar (2) is α; in the process that the front edge (11) of the fan blade extends from one end far away from the center of the fan blade (1) to the center of the fan blade (1), alpha is gradually increased, the increment of the staggered angle alpha between two adjacent grid bars (2) and the front edge (11) of the fan blade is gamma, and gamma is more than or equal to 3 degrees and less than or equal to 8 degrees.
4. The fan head assembly according to claim 3, wherein the angle of intersection between the end of the blade leading edge (11) far away from the center of the blade (1) and the grid bars (2) is α 1, and then α 1 satisfies 80 ° ≦ α 1 ≦ 100 °.
5. The head assembly of the fan according to claim 1 or 2, wherein the air outlet side of the fan blade (1) is a fan blade trailing edge (12), and the stagger angle between the fan blade trailing edge (12) and the grid bar (2) is β; in the process that the tail edge (12) of the fan blade extends from one end far away from the center of the fan blade (1) to the center of the fan blade (1), beta is gradually reduced, the reduction of a staggered angle beta between every two adjacent grid bars (2) and the tail edge (12) of the fan blade is delta, and delta is larger than or equal to 3 degrees and smaller than or equal to 8 degrees.
6. The fan head assembly according to claim 3, wherein the angle of intersection between the end of the blade leading edge (11) far away from the center of the blade (1) and the grid bars (2) is β 1, and then β 1 is 80 ° β 1 or more and 100 ° β 1 or less.
7. Head assembly of a fan according to claim 1 or 2, characterized in that the thickness of the grill bar (2) in the bending direction is d0, so that d0 satisfies 1mm ≦ d0 ≦ 4 mm.
8. The head assembly of the fan as claimed in claim 1 or 2, wherein the distance between the ends of two adjacent grid bars (2) far away from the center of the fan blade (1) is L1, then L1 satisfies that 6mm ≦ L1 ≦ 8.5 mm.
9. The head assembly of the fan as claimed in claim 1 or 2, wherein the distance between the ends of two adjacent grid bars (2) close to the center of the fan blade (1) is L2, then L2 is satisfied, and 2mm ≦ L2 ≦ 7 mm.
10. The head assembly of the fan as claimed in claim 1 or 2, further comprising an air duct structure (4), wherein the air duct structure (4) has an air inlet end, an air outlet end, and an air duct (41) communicating the air inlet end and the air outlet end, the rear net (31) is connected to the air inlet end, and the front net (32) is connected to the air outlet end.
11. The fan head assembly according to claim 10, further comprising a motor (5) for driving the fan blade (1) to rotate, wherein the motor (5) is disposed in the air duct (41).
12. The head assembly of a fan in claim 11, further comprising:
the motor bracket (6) is arranged in the air duct (41) and is provided with the motor (5);
the guide vane ribs (7) are radially arranged in the air duct (41) and are connected with the motor support (6) and the cavity wall of the air duct (41).
13. The fan head assembly according to claim 12, wherein each guide vane rib (7) is bent towards the same direction, and the bending direction is opposite to the rotation direction of the blade of the fan blade (1).
14. The head assembly of a fan according to claim 12, wherein the guide vane rib (7) projects on the grid (2) coincident with the grid (2).
15. The fan head assembly as claimed in claim 10, wherein the rear net (31) is provided with an annular air guide surface (8), the wall of the air duct (41) near one end of the rear net (31) is provided with a flow guide surface (9), and the air guide surface (8) and the flow guide surface (9) are in smooth transition.
16. The head assembly of a fan as claimed in claim 15, wherein the maximum inner diameter of the air guiding surface (8) is D2, and the minimum inner diameter of the air guiding surface (9) is D1, so that D2 and D1 satisfy 1.05 x D1 and D2 and 1.5 x D1.
17. A fan comprising a head assembly of the fan of any of claims 1-16.
18. The fan as claimed in claim 17, wherein the fan is a circulation fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023352624.XU CN214221633U (en) | 2020-12-31 | 2020-12-31 | Fan head assembly and fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023352624.XU CN214221633U (en) | 2020-12-31 | 2020-12-31 | Fan head assembly and fan |
Publications (1)
| Publication Number | Publication Date |
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| CN214221633U true CN214221633U (en) | 2021-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023352624.XU Active CN214221633U (en) | 2020-12-31 | 2020-12-31 | Fan head assembly and fan |
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| Country | Link |
|---|---|
| CN (1) | CN214221633U (en) |
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2020
- 2020-12-31 CN CN202023352624.XU patent/CN214221633U/en active Active
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