OBLIQUE FLOW BOOSTER FAN
An oblique flow booster fan includes an impeller having an impeller body and a plurality of blades, each blade spirally extended from top to bottom, two ends of each blade provided an upper edge and a lower edge respectively, and the upper edge having a width larger than the lower edge; an air guide assembly including an outer ring, an inner cylinder spaced apart in the outer ring, and air guide vanes evenly connected between the outer ring and the inner cylinder; a motor installed in the inner cylinder and having a rotating shaft connected to the impeller body; and a pressurization volute casing arranged outside the impeller and connected to the outer ring, one end of the pressurization volute casing provided with an air inlet, and another end of the outer ring provided with an air outlet. The fan is high wind pressure and low noise.
The present invention relates to the technical field of fans, and more particularly to an oblique flow booster fan suitable for air purifiers.
BACKGROUND OF THE INVENTIONAir purifiers, also known as air cleaners, air cleaners, or air purifiers, refer to the ability to absorb, decompose or transform various air pollutants such as particulate matters in the air, including allergens, indoor PM2.5, etc, so as to improve air cleanliness. Furthermore, air purifiers can also solve the air pollution problem of volatile organic compounds in indoors, underground spaces, and cars caused by decoration or other reasons.
The power source of the air purifier is the fan, and the operation status of the fan directly affects the performance of the air purifier. The higher the purification effect required by the air purifier, the greater the drag coefficient of the filter screen, and the greater the wind pressure required for the wind turbine fan. It is difficult for traditional centrifugal wind wheels or axial flow wind wheels to meet this high wind pressure requirement, or much noise will be generated if the fan operates at a sufficient wind pressure, which is undesirable.
Therefore, it is necessary to provide a new type of fan with high wind pressure and low noise to solve the above-mentioned problems in the prior art.
SUMMARY OF THE INVENTIONOne objective of the present invention is to provide an oblique flow booster fan with high wind pressure and low noise.
To achieve the mentioned above objective, the present invention provides an oblique flow booster fan including: an impeller, comprising an impeller body and a plurality of blades connected to the impeller body, each of the blades spirally extended from a top of the impeller body to a bottom of the impeller body, two ends of each of the blades being provided an upper edge and a lower edge respectively, and the upper edge having a width larger than the lower edge; an air guide assembly, comprising an outer ring, an inner cylinder spaced apart in the outer ring, and a plurality of air guide vanes evenly connected between the outer ring and the inner cylinder; a motor, installed in the inner cylinder and having a rotating shaft connected to the impeller body; and a pressurization volute casing, arranged outside the impeller and connected to the outer ring, one end of the pressurization volute casing being provided with an air inlet, and another end of the outer ring being provided with an air outlet.
Preferably, the impeller body is upward extended to form the upper edge that is spiral.
Preferably, the impeller has an odd number of the blades.
Preferably, the fan further includes a connecting base fixed at a top of the inner cylinder, the rotating shaft of the motor is protruded from the connecting base and connected to the impeller body.
Preferably, a holder is provided inside the inner cylinder for installing the motor.
Preferably, the inner cylinder is a frustum shape, and an outer diameter of a top of the inner cylinder is larger than that of a bottom of the inner cylinder, the inner cylinder is higher than the outer ring in an axial direction of the rotating shaft, and each of the air guide vanes are higher than the outer ring in the axial direction of the rotating shaft.
Preferably, each of the air guide vanes has a top side and a bottom side oppositely arranged, the top side is connected to the top of the inner cylinder and located above the outer ring, the bottom side is respectively connected to the inner cylinder and the outer ring, and the top side and the bottom side are bent toward each other in an axial direction of the rotating shaft to make each of the air guide vanes have an arc structure.
Preferably, the pressurization volute casing has a neck that is recessed inward, and an inner wall of the neck is spaced from the blades.
Preferably, the outer ring and the bottom edge of the pressurization volute casing are provided with protrusions and grooves matching with each other, and the protrusions are protruded along a radial direction of the outer ring.
Preferably, the pressurization volute casing includes a first casing and a second casing that are matched with each other, a first fixing part, a second fixing part, an engaging buckle, and a matching block are provided between the first and the second casings, the engaging buckle and the matching block are detachably engaged with each other, the first fixing part and the second fixing part are detachably connected together by a connector.
In comparison with the prior art, the blades of the impeller in the present invention are spirally extended from the top of the impeller body to the bottom, and the air guide assembly including an outer ring, an inner cylinder spaced apart in the outer ring, and a plurality of air guide vanes evenly connected therebetween are configured below the impeller. In such a specific configuration, the wind pressure is increased by using oblique flow pressurization principle, and the wind pressure is further increased due to the guidance of the air guide assembly. In addition, the two ends of each blade are respectively provided with an upper edge and a lower edge, and the width of the upper edge is greater than the width of the lower edge, thereby reducing the co-frequency resonance and the tail turbulence of the lower edge, thereby controlling the noise. Therefore, the oblique flow booster fan 100 of the present invention has the characteristics of high wind pressure and low noise, when it is applied to an air purifier, the clean air volume (CADR value) of the air purifier is increased accordingly.
The accompanying drawings facilitate an understanding of the various embodiments of this invention. In such drawings:
The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The oblique flow booster fan 100 provided by the present invention is mainly suitable for air purifiers, or other equipments, which is not limited here.
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Preferably, the impeller 111 has an odd number of the blades 112. As a preferred embodiment, nine blades 112 are configured. Combined with the principle of oblique flow pressurization, the wind pressure can be effectively increased. Of course, the number of the blades 112 can be changed according to actual demands.
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More specifically, the pressurization volute casing 150 includes a first casing 151 and a second casing 152 that are matched with each other. The first casing 151 is provided with first fixing parts 1511 and engaging buckles 1512, and the second casing 152 is provided with second fixing parts 1521 that match with the first fixing parts 1511 and matching blocks 1522 that match with the engaging buckles 1512. After the first casing 151 is connected to the second casing 152, the engaging buckles 1512 and the matching blocks 1522 can be detachably engaged with each other, and the first fixing parts 1511 and the second fixing parts 1521 can be detachably connected together by a connector (such as a bolt).
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In conclusion, the blades 112 of the impeller 110 in the present invention are spirally extended from the top of the impeller body to the bottom, and the air guide assembly 120 including an outer ring 121, an inner cylinder 122 spaced apart in the outer ring 121, and a plurality of air guide vanes 123 evenly connected therebetween are configured below the impeller 110. In such a specific configuration, the wind pressure is increased by using oblique flow pressurization principle, and the wind pressure is further increased due to the guidance of the air guide assembly 120. In addition, the two ends of each blade 112 are respectively provided with an upper edge 1121 and a lower edge 1122, and the width of the upper edge 1121 is greater than the width of the lower edge 1122, thereby reducing the co-frequency resonance and the tail turbulence of the lower edge 1122, thereby controlling the noise. Therefore, the oblique flow booster fan 100 of the present invention has the characteristics of high wind pressure and low noise, when it is applied to an air purifier, the clean air volume (CADR value) of the air purifier is increased accordingly.
It should be noted that, other structures of the air purifier involved in the present invention can be conventional designs well known to those of ordinary skill in the art, and thus no detailed description will be given here.
The foregoing description of the present invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. Such modifications and variations that may be apparent to those skilled in the art are intended to be included within the scope of this invention as defined by the accompanying claims.
Claims
1. An oblique flow booster fan, comprising:
- an impeller, comprising an impeller body and a plurality of blades connected to the impeller body, each of the blades spirally extended from a top of the impeller body to a bottom of the impeller body, two ends of each of the blades being provided an upper edge and a lower edge respectively, and the upper edge having a width larger than the lower edge;
- an air guide assembly, comprising an outer ring, an inner cylinder spaced apart in the outer ring, and a plurality of air guide vanes evenly connected between the outer ring and the inner cylinder;
- a motor, installed in the inner cylinder and having a rotating shaft connected to the impeller body; and
- a pressurization volute casing, arranged outside the impeller and connected to the outer ring, one end of the pressurization volute casing being provided with an air inlet, and another end of the outer ring being provided with an air outlet.
2. The oblique flow booster fan according to claim 1, wherein the impeller body is upward extended to form the upper edge that is spiral.
3. The oblique flow booster fan according to claim 1, wherein the impeller has an odd number of the blades.
4. The oblique flow booster fan according to claim 1, further comprising a connecting base fixed at a top of the inner cylinder, the rotating shaft of the motor is protruded from the connecting base and connected to the impeller body.
5. The oblique flow booster fan according to claim 1, wherein a holder is provided inside the inner cylinder for installing the motor.
6. The oblique flow booster fan according to claim 1, wherein the inner cylinder is a frustum shape, and an outer diameter of a top of the inner cylinder is larger than that of a bottom of the inner cylinder, the inner cylinder is higher than the outer ring in an axial direction of the rotating shaft, and each of the air guide vanes are higher than the outer ring in the axial direction of the rotating shaft.
7. The oblique flow booster fan according to claim 1, wherein each of the air guide vanes has a top side and a bottom side oppositely arranged, the top side is connected to the top of the inner cylinder and located above the outer ring, the bottom side is respectively connected to the inner cylinder and the outer ring, and the top side and the bottom side are bent toward each other in an axial direction of the rotating shaft to make each of the air guide vanes have an arc structure.
8. The oblique flow booster fan according to claim 1, wherein the pressurization volute casing has a neck that is recessed inward, and an inner wall of the neck is spaced from the blades.
9. The oblique flow booster fan according to claim 1, wherein the outer ring and the bottom edge of the pressurization volute casing are provided with protrusions and grooves matching with each other, and the protrusions are protruded along a radial direction of the outer ring.
10. The oblique flow booster fan according to claim 1, wherein the pressurization volute casing comprises a first casing and a second casing that are matched with each other, a first fixing part, a second fixing part, an engaging buckle, and a matching block are provided between the first and the second casings, the engaging buckle and the matching block are detachably engaged with each other, the first fixing part and the second fixing part are detachably connected together by a connector.
Type: Application
Filed: Aug 28, 2020
Publication Date: Sep 9, 2021
Inventors: Yucheng Lu (Foshan), Shengcheng Lu (Foshan)
Application Number: 17/005,698