CN112648232A - Backward centrifugal fan blade with staggered blades and backward centrifugal fan - Google Patents
Backward centrifugal fan blade with staggered blades and backward centrifugal fan Download PDFInfo
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- CN112648232A CN112648232A CN202110030410.0A CN202110030410A CN112648232A CN 112648232 A CN112648232 A CN 112648232A CN 202110030410 A CN202110030410 A CN 202110030410A CN 112648232 A CN112648232 A CN 112648232A
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- 238000000926 separation method Methods 0.000 abstract description 25
- 230000001808 coupling effect Effects 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
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Abstract
The invention discloses a backward centrifugal fan blade with staggered blades and a backward centrifugal fan, wherein the backward centrifugal fan blade comprises the staggered blades and a single blade, the staggered blades are obliquely arranged on one side of the single blade along the blade height direction of the single blade so as to form an included angle alpha between the staggered blades and the single blade, and the staggered blades extend from the connecting part of the staggered blades and the single blade to the direction of a wind wheel cover. In the blade height area close to the wind wheel cover, because the airflow is deflected rapidly from the axial direction to the radial direction, separation is easy to generate, a semi-staggered structure is formed after staggered blades are arranged in a partial area of a single row of blades, and flow separation can be effectively inhibited and flow loss is reduced by utilizing the coupling effect of the staggered blades and the single row of blades on the airflow. Therefore, the arrangement of the staggered blades on the single row of blades is superior to a simple staggered blade structure in which only the single row of blades is arranged or separated from the single row of blades.
Description
Technical Field
The invention relates to the field of fans, in particular to a backward centrifugal fan blade with staggered blades and a backward centrifugal fan.
Background
In the ventilation industry, it is common to use backward centrifugal fans in some applications where it is desired to change the direction of fluid medium flow from axial to radial. Generally speaking, under the condition that the traditional backward centrifugal fan meets the target performance, the noise is more prominent, and especially at present that the requirement of household appliance equipment on the noise is more strict, the defect that the noise of the backward centrifugal fan is high is more unacceptable. When the existing backward centrifugal fan is designed, due to the structural particularity, the air flow close to the wheel cover needs to turn rapidly in a small size range, so that the air flow is changed from axial flow to radial flow. Therefore, near the suction surface near the wheel cover, there is inevitably separation. At present, the method for solving the problem mainly comprises the method of adopting long and short blades and tandem blades, but the short blades or the tandem blades mainly adopt a structural form which is separately arranged with a single row of blades and are respectively and fixedly connected with a wheel cover and a wheel disc or are only connected with the wheel disc. In the blade height area near the wheel disc, because the flow conditions are relatively good, additional boundary layer separation and wake mixing loss can be caused after short blades or tandem blades are adopted.
Patent application publication No. CN104653515A discloses a double suction centrifugal fan. The centrifugal fan technology in China still needs to be improved continuously, so that the running stability of the fan can be enhanced, the running efficiency of the fan can be improved, and the power consumption of the fan can be reduced. The volute of the invention is provided with a guide plate at an outlet; two blade groups are symmetrically arranged on two sides of the wheel disc; the blade group comprises a long blade and a short blade; a plurality of long blades are uniformly distributed along the circumference, and a short blade is arranged between two adjacent long blades; the inner end surfaces of the long blades and the short blades are welded with the wheel disc, and the outer end surfaces of the long blades and the short blades are welded with the inner end of the wheel cover; the outer ends of the two wheel covers are respectively welded with a front guider; the welding end edges of the wheel cover, the long blade and the short blade are provided with bladeless expanding and pressing edges; the rim of the wheel disc is spherical; the inner side wall of the volute is provided with a plurality of resistance reducing grooves which are arranged at equal intervals along the axial direction of the wheel disc. What the scheme of this patent application adopted is the mode that sets up of length blade, and the blade links firmly with wheel cap and rim plate respectively along the last lower extreme of leaf height, and in the leaf height region that is close to the rim plate, because its flow condition is better relatively, can cause extra boundary layer separation and wake mixing loss behind the adoption short blade.
The patent with publication number CN205383109U discloses a centrifugal fan and an air conditioner, relating to the field of air conditioners and used for reducing fluid flow loss and noise of the centrifugal fan. The centrifugal fan comprises a first disc, a second disc and blades arranged between the first disc and the second disc, wherein a flow guide channel is formed between every two adjacent blades; wherein, a flow deflector is arranged in the flow guide channel; the guide vane and the blades have the same shape, and the guide vane and the blades have different sizes. According to the technical scheme, the flow deflector is added into the flow guide channel, so that the channel at the front edge of the original blade is narrowed from wide to narrow, the fluid in the flow guide channel is accelerated, and the kinetic energy of the fluid on the suction surface is effectively increased, so that the aggregation of low-energy fluid is effectively inhibited, the increase of the thickness of the boundary layer is inhibited, the phenomenon of air flow separation at the suction surface of the blade is further reduced, and the purposes of reducing the fluid flow loss and reducing the pneumatic noise of the centrifugal fan are finally achieved. The scheme of this patent adopts the tandem blade method, and the short blade only sets up on the rim plate, and in the blade height area that is close to the rim plate, because its flow condition is relatively better, can cause extra boundary layer separation and wake mixing loss behind the tandem blade adoption.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a backward centrifugal fan blade with staggered blades, wherein only the region of the backward centrifugal fan blade close to a wind wheel cover is in a staggered form, the staggered blades and a single blade are connected in a continuous smooth transition form to form a whole, and the staggered blades and the single blade are coupled to airflow at the same time, so that the flow separation can be effectively inhibited, and the flow loss is reduced, so that the problem of the prior art that the airflow needs to turn rapidly in a smaller size range to change the airflow from the axial direction to the radial direction so as to cause the flow separation near the suction surface of the wind wheel cover is solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a backward centrifugal fan blade with staggered blades, backward centrifugal fan blade sets up between wind wheel lid and the wind wheel dish of backward centrifugal fan, backward centrifugal fan blade includes staggered blades and single row blade, staggered blades follows the blade height direction slope of single row blade sets up one side of single row blade, so that staggered blades with be contained angle alpha between the single row blade, staggered blades by its with single row blade junction to wind wheel lid's direction extends the setting. The direction from the wind wheel cover to the wind wheel disc of the backward centrifugal fan blade is the blade height direction of the blade, and the direction from the front edge to the rear edge of the blade of the backward centrifugal fan blade is the blade width direction (namely the chord length direction of the blade) of the blade.
Preferably, the staggered blades are connected to the single row of blades by a continuous smooth transition.
Preferably, the staggered blades comprise a straight section and an inclined section, the straight section is connected with one side of the single-row blades along the blade height direction of the single-row blades, the joint of the inclined section and the straight section is an initial inclined point at which the inclined section begins to incline, the inclined section is arranged by extending from the initial inclined point to the direction of the wind wheel cover, and an included angle α is formed between the initial inclined point and the single-row blades.
Preferably, the staggered blades are disposed on the pressure face of a single row of blades.
Preferably, the staggered blades may also be disposed on the suction side of the single row of blades.
Preferably, each said backward centrifugal fan blade comprises at least one said staggered blade, i.e. each said single row of blades is provided with at least one staggered blade.
More preferably, a staggered blade is provided on each of the single rows of blades.
More preferably, each single-row blade is provided with at least two staggered blades along the direction from the front edge to the rear edge, and the staggered blades are arranged at intervals.
Preferably, the staggered blades and the single row of blades are integrally formed, and the straight sections of the staggered blades are integrally formed with the single row of blades.
Preferably, the thickness of the straight section is gradually increased from the wind wheel disc to the wind wheel disc cover, namely, along the direction from the starting end of the straight section to the starting inclined point, the thickness of the straight section is gradually increased, the whole side surface of the straight section is completely tightly attached to the pressure surface of the single-row blade, and under the condition that the straight section in the staggered blades and the single-row blade are integrally formed, the thickness of the position of the joint of the straight section and the single-row blade is also gradually increased along the direction from the wind wheel disc to the wind wheel disc cover, so that the joint of the staggered blade and the single-row blade has enough strength, and cracks at the joint of the staggered blade and the single-row blade after long-time use are avoided.
Preferably, the thickness of the straight section is constant in a direction from the starting end of the straight section to the starting inclined point.
Preferably, said staggered blades are arranged in an area of said single row of blades close to said wind wheel cover. The staggered blade structure which can ensure that the blade height area of the single-row blades close to the wind wheel disc is not separated is arranged, so that the separation of an extra boundary layer and the blending loss of a wake caused by adopting the staggered blades are avoided; in the blade height area close to the wind wheel cover, the separation is easy to generate because the airflow rapidly deflects from the axial direction to the radial direction, a semi-staggered structure is formed after staggered blades are arranged in a partial area of a single-row blade, and the flow separation can be effectively inhibited and the flow loss is reduced by utilizing the coupling effect of the staggered blades and the single-row blade on the airflow. Therefore, the arrangement of the staggered blades on the single row of blades is superior to a simple staggered blade structure in which only the single row of blades is arranged or separated from the single row of blades.
More preferably, there is a height difference L3 between the starting end of the straight section of the staggered blades and the lower end surface of the single row of blades in the blade height direction.
Preferably, the upper end surfaces of the staggered blades and the upper end surfaces of the single-row blades in the blade height direction are at the same height.
Preferably, along the direction from the front edge to the rear edge of the single row of blades, namely the air outlet direction of a centrifugal wind wheel on a backward centrifugal fan, the chord length L5 of the staggered blades and the chord length L4 of the single row of blades have the following relation: L5/(L4+ L5) is 1/5-4/5.
More preferably, the chord length L5 of the staggered blades and the chord length L4 of the single row of blades have the relationship: L5/(L4+ L5) is 1/3-1/2.
Preferably, the chord length L4 of the single row of blades is the chord length of the section of the bottom side of the single row of blades connected with the wind wheel disc.
Preferably, the staggered blades extend from the trailing edge of the single-row blade to the leading edge of the single-row blade. Namely, the staggered blades extend from the trailing edge of the single-row blades in the width direction of the single-row blades. This arrangement can utilize the staggered blades and the single blade to simultaneously couple the airflow at the trailing edge, and can further ensure the effect of suppressing flow separation.
Preferably, the staggered blades extend from a position adjacent to the trailing edge of the single row of blades to the leading edge of the single row of blades.
Preferably, in the blade height direction of the single row of blades, the relationship between the blade height L2 of the staggered blades and the blade height L1 of the single row of blades is: L2/L1 is 1/4-1.
More preferably, the relationship of the leaf height L2 of the staggered leaf to the leaf height L1 of the single row of leaves is: L2/L1 is 1/3-2/3.
Preferably, the blade height L2 of the staggered blades is the projection height of the starting end of the straight section of the staggered blades to the upper end surface of the staggered blades in the axial direction of the backward centrifugal fan.
Preferably, the height of the inclined section of the staggered blade in the axial direction of the backward centrifugal fan from the initial inclined point to the upper end face of the staggered blade is less than the height L2 of the staggered blade.
Preferably, the starting point of inclination of said staggered blades is located in the upper half of said single row of blades in the direction of blade height.
Preferably, the range of the included angle α between the staggered blades and the single row of blades is as follows: alpha is more than or equal to 60 degrees and more than or equal to 15 degrees.
More preferably, the range of the included angle α between the staggered blades and the single row of blades is: alpha is more than or equal to 40 degrees and more than or equal to 20 degrees.
The second objective of the present invention is to provide a backward centrifugal fan to solve the problem of extra boundary layer separation and wake mixing loss caused by the use of short blades or tandem blades in the prior art. The rear centrifugal fan comprises a current collector, a centrifugal wind wheel and a motor, the centrifugal wind wheel comprises a wind wheel cover, a wind wheel disc and is arranged at the rear centrifugal fan blades between the wind wheel cover and the wind wheel disc, the motor is installed in the inner ring of the wind wheel disc and is adjacent to the rear centrifugal fan blades, the wind wheel disc and the wind wheel cover jointly enclose a flow channel, the inner ring of a chassis of the wind wheel cover axially faces away from the inner ring of the wind wheel disc, the wheel cover side wall forms a wheel cover air inlet, the current collector is installed in the inner ring of the wheel cover side wall, the rear centrifugal fan blades are any one of the above-mentioned implementation modes, and the rear centrifugal fan blades are the centrifugal fan blades.
Preferably, the upper end surface and the lower end surface of a single row of blades in the backward centrifugal fan along the blade height direction are respectively connected with the wind wheel cover and the wind wheel disc, and the upper end surface of the staggered blades along the blade height direction is connected with the wind wheel cover.
Preferably, said staggered blades on each rearward centrifugal fan blade are disposed offset to the suction side of a single row of adjacent rearward centrifugal fan blades.
Preferably, the staggered blades on all backward centrifugal fan blades in the centrifugal wind wheel and the single row of blades form equal included angles alpha.
Preferably, along centrifugal wind wheel's direction of rotation, on the centrifugal wind wheel's the back centrifugal fan blade of centrifugal wind wheel between the staggered blade with be the contained angle alpha increase in proper order or reduce in proper order.
Compared with the prior art, the invention has the beneficial technical effects that:
the application discloses backward centrifugal fan blade includes stagger arrangement blade and single row blade, the stagger arrangement blade is followed the blade height direction slope of single row blade sets up one side of single row blade, so that the stagger arrangement blade with be contained angle alpha between the single row blade, the stagger arrangement blade by its with the single row blade junction to the direction of wind wheel lid extends the setting. Because the single-row blades are adopted in the blade height area which is close to the wind wheel disc and has no separation, the additional boundary layer separation and wake mixing loss caused by the adoption of staggered blades can be avoided; in the blade height area close to the wind wheel cover, because the airflow is deflected rapidly from the axial direction to the radial direction, separation is easy to generate, a semi-staggered structure is formed after staggered blades are arranged in a partial area of a single row of blades, and flow separation can be effectively inhibited and flow loss is reduced by utilizing the coupling effect of the staggered blades and the single row of blades on the airflow. Therefore, the arrangement of the staggered blades on the single row of blades is superior to a simple staggered blade structure in which only the single row of blades is arranged or separated from the single row of blades. The invention can also solve the problems of additional boundary layer separation and wake mixing loss caused by adopting short blades or tandem blades in the blade height area close to the wind wheel disc in the prior art due to relatively good flow conditions.
Drawings
FIG. 1 is a schematic perspective view of a rearward centrifugal fan having blades staggered according to the present invention;
FIG. 2 is a front view of a rearward centrifugal fan having staggered blades according to the present invention;
FIG. 3 is a schematic view of an assembled aft centrifugal fan blade and rotor disk having staggered blades according to the present invention;
FIG. 4 is a schematic structural view of a backward centrifugal fan blade with staggered blades according to the present invention;
FIG. 5 is a schematic diagram of the relationship between the heights and chord lengths of staggered blades and single blades in a backward centrifugal fan blade with staggered blades according to the present invention.
Reference numerals:
1-current collector, 2-wind wheel cover, 3-backward centrifugal fan blade, 31-suction surface, 32-pressure surface, 4-wind wheel disc, 41-wind wheel disc inner ring, 5-motor, 6-single-row blade, 7-staggered blade, 71-straight section, 72-inclined section, 73-initial inclined point, and 74-initial end.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.
As shown in figures 1 and 4, a backward centrifugal fan blade 3 with staggered blades 7 is provided between a wind wheel cover 2 and a wind wheel disc 4 of a backward centrifugal fan, the backward centrifugal fan blade 3 comprises the staggered blades 7 and a single row of blades 6, the staggered blades 7 are obliquely arranged on one side of the single row of blades 6 along the blade height direction of the single row of blades 6, so that an included angle alpha is formed between the staggered blades 7 and the single row of blades 6, and the staggered blades 7 are arranged by extending the joints of the staggered blades 7 and the single row of blades 6 to the direction of the wind wheel cover 2. The direction from the wind wheel cover 2 to the wind wheel disc 4 of the backward centrifugal fan blade 3 is the blade height direction of the blade, and the direction from the front edge of the centrifugal fan blade to the rear edge of the blade is the blade width direction of the blade (namely the chord length direction of the blade).
The staggered blades 7 are connected with the single row of blades 6 by means of a continuous smooth transition. The staggered blades 7 and the single-row blades 6 are integrally formed, and the straight sections 71 in the staggered blades 7 and the single-row blades 6 are integrally formed. The staggered blades 7 are arranged on the pressure face 32 of a single row of blades 6. Each of the backward centrifugal fan blades 3 comprises at least one of the staggered blades 7, i.e. each of the single rows of blades 6 is provided with at least one staggered blade 7. Preferably, in the present embodiment, each single row of blades 6 is provided with a staggered blade 7.
The staggered blade 7 comprises a straight section 71 and an inclined section 72, wherein the straight section 71 is connected with one side of the single-row blade 6 along the blade height direction of the single-row blade 6, the inclined section 72 is connected with the straight section 71 at the initial inclined point 73 at which the inclined section 72 begins to incline, the inclined section 72 is formed by extending the initial inclined point 73 to the direction of the wind turbine cover 2, and the inclined section 72 forms an included angle alpha between the initial inclined point 73 and the single-row blade 6. The range of the included angle alpha between the staggered blades 7 and the single-row blades 6 is as follows: alpha is more than or equal to 60 degrees and more than or equal to 15 degrees. In this embodiment, preferably, the range of the included angle α between the staggered blades 7 and the single row of blades 6 is: alpha is more than or equal to 40 degrees and more than or equal to 20 degrees.
The thickness of the straight section 71 is gradually increased from the wind wheel disc 4 to the wind wheel disc cover 2, that is, along the direction from the starting end 74 of the straight section 71 to the starting inclined point 73, the thickness of the straight section 71 is gradually increased, the whole side surface of the straight section 71 is completely tightly attached to the pressure surface 32 of the single-row blade 6, and under the condition that the straight section 71 of the staggered blade 7 and the single-row blade 6 are integrally formed, the thickness of the position where the straight section 71 is connected with the single-row blade 6 is also gradually increased along the direction from the wind wheel disc 4 to the wind wheel disc cover 2, so that the connection between the staggered blade 7 and the single-row blade 6 has enough strength, and cracks at the connection between the staggered blade 7 and the single-row blade 6 after long-time use are avoided.
The staggered blades 7 are arranged in the area of the single row of blades 6 close to the rotor cover 2. The staggered blade 7 structure which can ensure that the blade height area of the single-row blade 6 close to the wind wheel disc 4 has no separation is arranged, so that the extra boundary layer separation and wake mixing loss caused by adopting the staggered blades 7 are avoided; in the blade height area close to the wind wheel cover 2, the separation is easy to generate because the airflow rapidly deflects from the axial direction to the radial direction, a semi-staggered structure is formed after the staggered blades 7 are arranged in the partial area of the single-row blades 6, and the flow separation can be effectively inhibited and the flow loss is reduced by utilizing the coupling effect of the staggered blades 7 and the single-row blades 6 on the airflow. Therefore, the arrangement of the staggered blades 7 on the single row of blades 6 is superior to the simple staggered blade 7 structure in which only the single row of blades 6 is arranged or the single row of blades 6 is separated.
The upper end surfaces of the staggered blades 7 and the upper end surfaces of the single-row blades 6 in the blade height direction are at the same height.
As shown in fig. 3 and 5, along the leading edge to trailing edge direction of the single row of blades 6, i.e. the wind outlet direction of the centrifugal wind wheel on the backward centrifugal fan, the chord length L5 of the staggered blades 7 and the chord length L4 of the single row of blades 6 have the following relationship: L5/(L4+ L5) is 1/5-4/5. The chord length L4 of the single-row blade 6 is the chord length of the section of the bottom edge of the connection between the single-row blade 6 and the wind wheel disc 4.
The staggered blades 7 extend from the rear edge of the single-row blades 6 to the front edge of the single-row blades 6. Namely, the staggered blades 7 are arranged to extend from the trailing edge of the single row of blades 6 in the blade width direction of the single row of blades 6. This arrangement allows the staggered blades 7 and the single row blades 6 to simultaneously couple the airflows at the trailing edge, thereby further ensuring the effect of suppressing flow separation.
A height difference L3 exists between the starting end 74 of the straight section 71 of the staggered blade 7 and the lower end surface of the single row of blades 6 in the blade height direction. In the blade height direction of the single row of blades 6, the relationship between the blade height L2 of the staggered blades 7 and the blade height L1 of the single row of blades 6 is: L2/L1 is 1/4-1. The blade height L2 of the staggered blade 7 is the projection height of the starting end 74 of the straight section 71 of the staggered blade 7 to the upper end surface of the staggered blade 7 in the axial direction of the backward centrifugal fan. Preferably, in the present embodiment, the height of the inclined section 72 of the staggered blade 7 in the axial direction of the backward centrifugal fan from the starting inclined point 73 to the upper end surface of the staggered blade 7 is less than the height L2 of the staggered blade 7. The starting point 73 of the staggered blades 7 is located in the upper half of the single row of blades 6 in the blade height direction.
Example 2
This embodiment will be described only for differences from the above-described embodiment, and the remaining technical features are the same as those of the above-described embodiment. In this embodiment, the staggered blades 7 may also be disposed on the suction surface 31 of the single row of blades 6.
Example 3
This embodiment will be described only for differences from the above-described embodiment, and the remaining technical features are the same as those of the above-described embodiment. In the present embodiment, each of the single-row blades 6 is provided with at least two staggered blades 7 along the direction from the leading edge to the trailing edge, and the staggered blades 7 are arranged at intervals.
Example 4
This embodiment will be described only for differences from the above-described embodiment, and the remaining technical features are the same as those of the above-described embodiment. In the present embodiment, each of the single-row blades 6 is provided with at least two staggered blades 7 along the blade height direction, and the staggered blades 7 are arranged at intervals.
Example 5
This embodiment will be described only for differences from the above-described embodiment, and the remaining technical features are the same as those of the above-described embodiment. In the present embodiment, the thickness of the straight section 71 is constant along the direction from the starting end 74 of the straight section 71 to the starting inclined point 73.
Example 6
This embodiment will be described only for differences from the above-described embodiment, and the remaining technical features are the same as those of the above-described embodiment. In the present embodiment, the upper end surface of the staggered blades 7 is lower than the upper end surface of the single row of blades 6 in the blade height direction.
Example 7
This embodiment will be described only for differences from the above-described embodiment, and the remaining technical features are the same as those of the above-described embodiment. In the present embodiment, the staggered blades 7 extend from a position adjacent to the trailing edge of the single row of blades 6 to the leading edge of the single row of blades 6.
As shown in fig. 1 and 2, a backward centrifugal fan is provided to solve the problem of additional boundary layer separation and wake mixing loss caused by the use of short blades or tandem blades in the prior art. The backward centrifugal fan comprises a current collector 1, a centrifugal wind wheel and a motor 5, the centrifugal wind wheel comprises a wind wheel cover 2, a wind wheel disc 4 and a plurality of backward centrifugal fan blades 3 arranged between the wind wheel cover 2 and the wind wheel disc 4, the motor 5 is installed in an inner ring of the wind wheel disc 4 and is adjacent to the backward centrifugal fan blades 3, the wind wheel cover 2 and the wind wheel disc 4 jointly form a flow channel, an inner ring of a chassis of the wind wheel cover 2 faces away from the wind wheel disc 4 in an axial direction in a bending mode to form a wheel cover side wall, the wheel cover side wall forms a wheel cover air inlet, the current collector 1 is installed in an inner ring of the wheel cover side wall, the current collector is characterized in that the backward centrifugal fan blades 3 are any one of the above embodiments, and the backward centrifugal fan blades 3 are arranged in the wheel cover side.
The upper end face and the lower end face of a single-row blade 6 in the backward centrifugal fan along the blade height direction are respectively connected with the wind wheel cover 2 and the wind wheel disc 4, and the upper end face of the staggered blade 7 along the blade height direction is connected with the wind wheel cover 2.
Said staggered blades 7 on each backward centrifugal fan blade 3 are arranged offset to the suction surface 31 of the single row of blades 6 of the adjacent backward centrifugal fan blade 3. The staggered blades 7 on all the backward centrifugal fan blades 3 in the centrifugal wind wheel and the single-row blades 6 form equal included angles alpha.
Example 8
This embodiment will be described only for differences from the above-described embodiment, and the remaining technical features are the same as those of the above-described embodiment. In this embodiment, along the direction of rotation of centrifugal wind wheel, in centrifugal wind wheel after on centrifugal fan blade 3 staggered blade 7 with be the contained angle alpha between the single row blade 6 and increase in proper order or reduce in proper order.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a backward centrifugal fan blade (3) with staggered blade (7), backward centrifugal fan blade (3) set up between wind wheel lid (2) and wind wheel dish (4) of backward centrifugal fan, its characterized in that, backward centrifugal fan blade (3) are including staggered blade (7) and single row blade (6), staggered blade (7) are followed the blade height direction slope of single row blade (6) sets up one side of single row blade (6), so that staggered blade (7) with be contained angle alpha between single row blade (6), staggered blade (7) by its with single row blade (6) junction to the direction of wind wheel lid (2) extends the setting.
2. Backward centrifugal fan blade (3) with staggered blades (7) according to claim 1, characterized in that the staggered blades (7) are connected with the single row of blades (6) by means of a continuous smooth transition.
3. Backward centrifugal fan blade (3) with staggered blades (7) according to claim 1, characterized in that the staggered blades (7) comprise a straight section (71) and an inclined section (72), the straight section (71) is connected with one side of the single row of blades (6) in the direction of the blade height of the single row of blades (6), the inclined section (72) is connected with the straight section (71) at a starting inclined point (73) at which the inclined section (72) starts to incline, the inclined section (72) extends from the starting inclined point (73) in the direction of the wind wheel cover (2), and the inclined section (72) forms an included angle α between the starting inclined point (73) and the single row of blades (6).
4. Backward centrifugal fan blade (3) with staggered blades (7) according to any of claims 1 to 3, characterized in that the staggered blades (7) are arranged on the pressure face (32) of a single row of blades (6).
5. Backward centrifugal fan blade (3) with staggered blades (7) according to any of claims 1 to 3, characterized in that the staggered blades (7) are arranged on the single row of blades (6) in the area close to the wind wheel cover (2).
6. Backward centrifugal fan blade (3) with staggered blades (7) according to claim 1, characterized in that, in the leading edge to trailing edge direction of the single row of blades (6), the chord length L5 of the staggered blades (7) is in relation to the chord length L4 of the single row of blades (6): L5/(L4+ L5) is 1/5-4/5.
7. Backward centrifugal fan blade (3) with staggered blades (7) according to claim 1, characterized in that, in the blade height direction of the single row of blades (6), the blade height L2 of the staggered blades (7) is in relation to the blade height L1 of the single row of blades (6) by: L2/L1 is 1/4-1.
8. Backward centrifugal fan blade (3) with staggered blades (7) according to claim 1, characterized in that the range of angles a of the staggered blades (7) to a single row of blades (6) is: alpha is more than or equal to 60 degrees and more than or equal to 15 degrees.
9. A backward centrifugal fan, which comprises a current collector (1), a centrifugal wind wheel and a motor (5), the centrifugal wind wheel comprises a wind wheel cover (2), a wind wheel disc (4) and a plurality of backward centrifugal fan blades (3) arranged between the wind wheel cover (2) and the wind wheel disc (4), the motor (5) is arranged in the inner ring of the wind wheel disc (4), the blades (3) of the backward centrifugal fan, the wind wheel cover (2) and the wind wheel disc (4) which are adjacent to each other enclose a flow channel, the inner ring of the chassis of the wind wheel cover (2) is bent and extended along the axial direction towards the direction far away from the wind wheel disc (4) to form a side wall of the wheel cover, the side wall of the wheel cover forms a wheel cover air inlet, the current collector (1) is arranged in an inner ring of the side wall of the wheel cover, the backward centrifugal fan blade (3) is characterized in that the backward centrifugal fan blade (3) is the backward centrifugal fan blade (3) according to any one of claims 1-8.
10. The backward centrifugal fan according to claim 9, wherein the single-row blades (6) are respectively connected with the wind wheel cover (2) and the wind wheel disc (4) along the upper end surface and the lower end surface of the blade height direction, and the staggered blades (7) are connected with the wind wheel cover (2) along the upper end surface of the blade height direction.
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| CN202110030410.0A CN112648232A (en) | 2021-01-11 | 2021-01-11 | Backward centrifugal fan blade with staggered blades and backward centrifugal fan |
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| CN202110030410.0A CN112648232A (en) | 2021-01-11 | 2021-01-11 | Backward centrifugal fan blade with staggered blades and backward centrifugal fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117307511A (en) * | 2023-11-30 | 2023-12-29 | 泛仕达机电股份有限公司 | Ventilator and installation method |
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| CN206903939U (en) * | 2017-07-14 | 2018-01-19 | 美的集团股份有限公司 | Centrifugal impeller and there is its centrifugal blower, dust catcher |
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| JPH10122188A (en) * | 1996-10-23 | 1998-05-12 | Matsushita Seiko Co Ltd | Centrifugal blower |
| US20120100003A1 (en) * | 2009-07-13 | 2012-04-26 | Jo Masutani | Impeller and rotary machine |
| CN104314865A (en) * | 2014-10-29 | 2015-01-28 | 珠海格力电器股份有限公司 | Backward centrifugal impeller and centrifugal fan |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117307511A (en) * | 2023-11-30 | 2023-12-29 | 泛仕达机电股份有限公司 | Ventilator and installation method |
| CN117307511B (en) * | 2023-11-30 | 2024-03-01 | 泛仕达机电股份有限公司 | Ventilator and installation method |
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Application publication date: 20210413 |