CN216767855U - Impeller, centrifugal fan comprising impeller and household appliance comprising centrifugal fan - Google Patents

Abstract

The application relates to an impeller, a centrifugal fan comprising the impeller and a household appliance comprising the centrifugal fan, and belongs to the technical field of fans, wherein the impeller comprises a hub disc, a plurality of fan blades fixedly arranged on the hub disc and a wind shield; the fan blades are circumferentially arranged by taking the rotation axis direction of the hub plate as an axis, and one end of each fan blade close to the axis direction of the hub plate forms an air inlet space; the wind shields are arranged on the fan blades at the same time, and one ends of the fan blades far away from the hub plate are attached to the wind shields; the wind shield is provided with an air inlet hole which is communicated with the air inlet space. This application has the loss that flabellum and air friction caused kinetic energy in the high-speed pivoted impeller of reduction centrifugal fan during operation improve the effect of the convulsions efficiency of impeller.

Description

Impeller, centrifugal fan comprising impeller and household appliance comprising centrifugal fan

Technical Field

The present application relates to the field of fans, and more particularly, to a centrifugal impeller.

Background

Centrifugal fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships and buildings for ventilation, dust removal and cooling; ventilating and air inducing of boilers and industrial kilns; cooling and ventilation in air conditioning equipment and household appliances; drying and selecting grains; wind tunnel wind source and air cushion boat inflation and propulsion.

The related centrifugal fan comprises a casing, a main shaft, an impeller, a motor and the like, wherein the motor drives the impeller to rotate around the main shaft in the casing, the casing is provided with an air inlet for air inlet and an air outlet for air outlet, the impeller comprises a hub disc and a plurality of fan blades arranged on the surface of one side of the hub disc close to the air inlet, and the plurality of fan blades are circumferentially arranged by taking the axial direction of the impeller as an axis; the axial direction of the impeller is opposite to the air outlet, when the impeller rotates, air outside the casing enters a plurality of fan blades along the axial direction of the impeller, the fan blades rotate to generate centrifugal force to throw the air out of the adjacent fan blades, the air is thrown out of the adjacent fan blades and then is collected in the casing, the pressure in the casing is increased, and the air is discharged from the air outlet of the casing.

In view of the above-mentioned related technologies, the inventor believes that, because the hub plate and the fan blades are both located inside the casing, in order to avoid the friction between the fan blades and the inner wall of the casing, a gap may remain between the fan blades and the casing, and when the fan blades rotate to suck the air outside the casing into the space between the fan blades, the air in the gap between the fan blades and the casing may also be disturbed, and the kinetic energy of the rotation of the fan blades may be lost due to the friction between the air between the fan blades rotating at a high speed and the casing, thereby reducing the air draft efficiency of the centrifugal fan.

SUMMERY OF THE UTILITY MODEL

In order to reduce the loss of kinetic energy caused by the friction between fan blades and air in the impeller rotating at a high speed during the work of the centrifugal fan and improve the air draft efficiency of the impeller, the application provides the impeller, the centrifugal fan comprising the impeller and the household appliance comprising the centrifugal fan.

In a first aspect, the present application provides an impeller, including a hub plate, a plurality of blades fixedly disposed on the hub plate, and a wind shield; the fan blades are circumferentially arranged by taking the rotation axis direction of the hub plate as an axis, and one end of each fan blade close to the axis direction of the hub plate forms an air inlet space; the wind shields are arranged on the fan blades at the same time, and one ends of the fan blades, which are far away from the hub disc, are attached to the wind shields; the wind shield is provided with an air inlet hole, and the air inlet hole is communicated with the air inlet space.

By adopting the technical scheme, when the hub rotates around the axis of the hub, air is sucked into the air inlet space from the air inlet hole and is dispersed among the plurality of fan blades, and the rotating fan blades throw out the air entering between two adjacent fan blades along the radial direction of the hub disc; due to the arrangement of the wind shield, the rotating fan blades are not easy to disturb the air nearby at the end far away from the hub plate and rub with the air, so that the wind resistance of the fan blades during movement is reduced, the loss of kinetic energy of the impeller during rotation is reduced, and the air draft efficiency of the impeller is improved.

Optionally, a blade groove is formed in the hub plate, the fan blade is inserted into the blade groove, and the side wall of the blade groove abuts against the side surface of the fan blade.

By adopting the technical scheme, the contact area between the fan blades and the hub plate is increased, the fan blades and the hub plate can be fixed more firmly, and the stability of the fan blades during rotation of the hub plate is enhanced.

Optionally, one end of each fan blade, which is close to the hub plate, is provided with a welding block, and the hub plate is provided with a plurality of welding holes which correspond to the welding blocks on each fan blade one to one; the welding block penetrates through the welding hole and extends to one side surface of the hub disc far away from the fan blades.

By adopting the technical scheme, one end of the welding block, which is far away from the fan blade, can be directly melted and welded at the edge of the orifice of the welding hole, which is far away from the fan blade, in an ultrasonic welding mode, so that the fan blade is fixed on the hub plate, and compared with the mode of casting and demolding or 3D printing, the process for fixing the fan blade is simple, the efficiency is high, and the cost is low; meanwhile, the position of the fan blades and the hub disc which are connected through ultrasonic welding is located on one side, far away from the fan blades, of the hub disc, the protruding welding spots are not prone to blocking air flowing between the fan blades, and the air guide effect of the fan blades is improved.

Optionally, a welding groove is formed in the surface of one side, away from the fan blades, of the hub plate, and the welding hole is formed in the bottom of the welding groove.

By adopting the scheme, when the welding blocks are subjected to ultrasonic welding, the melted welding blocks flow into the welding grooves and fill up the welding grooves, so that on one hand, the welding and fixing area is increased, and the fan blades can be more firmly fixed on the hub plate; on the other hand, because the melted welding blocks are filled in the welding grooves, after the fan blades are fixed on the hub disc in an ultrasonic welding mode, welding point protrusions are not easy to appear on the surface of one side, far away from the fan blades, of the hub disc, and the attractiveness of the product is guaranteed.

Optionally, a shaft center hole is formed through the hub plate, the shaft center hole is located at a rotation shaft center of the hub plate, and the shaft center hole is used for penetrating and arranging a spindle; the edge of an orifice at one end of the axle center hole, which is positioned in the air inlet space, protrudes in the direction away from the hub disc along the axis direction of the hub disc to form a protruding part, the connection part of the side surface of the protruding part and the hub disc is in a cambered surface transition shape, and the opening of the cambered surface faces the direction away from the hub disc.

By adopting the scheme, on one hand, the contact area between the main shaft and the hub plate is increased by the arrangement of the convex part, and the stability of the hub plate rotating around the main shaft is increased; on the other hand, the air sucked into the air inlet space impacts on the convex part along the rotation axis direction of the hub disc, the convex part plays a role in guiding the air entering the air inlet space due to the fact that the connection part of the side surface of the convex part and the hub disc is in a cambered transition shape and the opening of the cambered surface faces the direction far away from the hub disc, the air impacting on the convex part smoothly changes the flowing direction along the side surface of the convex part and enters the fan blades, and the effect of reducing noise is achieved.

Optionally, an accommodating groove is formed in one end, away from the fan blades, of the hub plate, and the accommodating groove is used for accommodating the motor.

Through adopting above-mentioned technical scheme for drive wheel hub pivoted motor can install in the storage tank, can reduce the holistic volume of fan.

In a second aspect, the present application provides a centrifugal fan comprising a casing and the impeller rotatably disposed within the casing; the shell is provided with an air inlet and an air outlet, and the air inlet and the air outlet are communicated with the inner space and the outer space of the shell; the air inlet and the air inlet hole are oppositely arranged, and the air inlet space is communicated with the air inlet.

Through adopting above-mentioned technical scheme, the impeller rotates and makes the outside air of casing get into the wind space through air intake and income wind hole in, and the air in the space of will going into the wind is thrown away to the casing along the radial direction of impeller in to the pivoted flabellum, and casing internal pressure increases and makes the air in the casing discharge from the air outlet, owing to used above-mentioned impeller for this centrifugal fan has low noise, be convenient for installation and beneficial effect such as high-effect.

Optionally, a circumferential edge of the hole wall of the air inlet hole extends in a direction close to the air inlet to form an air guide portion, an annular through groove is formed in the inner wall of the casing on one side close to the air inlet hole, the annular through groove is arranged around the opening edge of the air inlet in a circumferential manner, the air guide portion is arranged in the annular through groove, and gaps are formed between the air guide portion and the side wall and the bottom of the annular through groove.

Through adopting above-mentioned technical scheme, the outside air of casing directly gets into the wind space through wind-guiding portion in, and wind-guiding portion and annular lead to the cell wall of groove mutually support the restriction and get into the casing from the space between casing and the deep bead by the air current that the air intake got into inside, increased the air volume that enters into in the wind space, further improved centrifugal fan's convulsions efficiency.

In a third aspect, the present application provides a household appliance comprising the centrifugal fan.

By adopting the technical scheme, the household electric appliance using the centrifugal impeller has the beneficial effects of low noise, high efficiency, low energy consumption and the like.

Drawings

Fig. 1 is a schematic structural diagram of a centrifugal fan according to the present application.

Fig. 2 is a schematic view showing a structure of an impeller inside a casing in a centrifugal fan according to the present application.

Fig. 3 is an exploded view of a centrifugal fan according to the present application.

Fig. 4 is a schematic diagram of an exploded structure of an impeller according to the present application.

Fig. 5 is a front view of an exploded view of an impeller of the present application.

Description of reference numerals: 1. a housing; 11. a first housing; 111. a snap ring; 112. an air inlet; 113. an annular through groove; 12. a second housing; 121. clamping teeth; 122. mounting grooves; 123. a fixed seat; 13. an air outlet; 2. an impeller; 21. a hub plate; 211. a leaf disc; 2111. a leaf groove; 2112. welding holes; 2113. welding a groove; 2114. a shaft center hole; 2115. a boss portion; 212. a hub; 2121. a containing groove; 22. a fan blade; 221. welding blocks; 23. a wind deflector; 231. an air inlet hole; 232. a wind guide part; 24. the air inlet space.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses centrifugal fan.

Referring to fig. 1 and 2, the centrifugal fan includes a casing 1 and an impeller 2 rotatably disposed in the casing 1, the casing 1 is divided into a first casing 11 and a second casing 12 along a radial direction of rotation of the impeller 2, the first casing 11 is fixedly provided with three snap rings 111, the second casing 12 is provided with three snap teeth 121, the first casing 11 and the second casing 12 are mutually fastened and fixed through the snap rings 111 and the snap teeth 121, and the casing 1 is conveniently disassembled to maintain and replace the impeller 2 or the motor inside the casing; an air inlet 112 with a circular cross section is formed in the first shell 11, an installation groove 122 with a circular cross section and used for installing an outer rotor motor is formed in the second shell 12, a fixed seat 123 is integrally and fixedly arranged at the bottom of the installation groove 122, and the fixed seat 123 is used for inserting and fixing a main shaft and fixing a stator of the outer rotor motor; an air outlet 13 is arranged on the side surface of the machine shell 1.

Referring to fig. 2, the impeller 2 includes a hub disc 21, a plurality of blades 22 and a wind shield 23, the hub disc 21 includes a leaf disc 211 with a circular cross-sectional shape and a hub 212 fixedly connected with the leaf disc 211 integrally, the cross-sectional shape of the hub 212 is circular, the hub 212 and the leaf disc 211 are coaxially disposed, a receiving groove 2121 with a circular cross-sectional shape is formed in a surface of one side of the hub 212 away from the leaf disc 211, the receiving groove 2121 and the hub 212 are coaxially disposed, the receiving groove 2121 is used for mounting an outer rotor motor, a groove wall of the receiving groove 2121 is used for directly connecting with an outer rotor of the outer rotor motor, and transmission efficiency can be improved and noise can be reduced by driving the impeller 2 to rotate by the outer rotor motor.

Referring to fig. 2 and 3, the fan blades 22 are arranged on the surface of one side of the blisk 211, which is far away from the hub 212, the number of the fan blades 22 is eight, the eight fan blades 22 are uniformly and circumferentially arranged by taking the rotation axis direction of the blisk 211 as an axis, the blisk 211 is provided with eight blade slots 2111, the arrangement mode of the eight blade slots 2111 is the same as that of the eight fan blades 22, and one end of the slot bottom of each blade slot 2111, which is close to the rotation axis direction of the blisk 211, is provided with a welding hole 2112 penetrating through the blisk 211; the middle part of one end of the fan blade 22 close to the blisk 211 is provided with a welding block 221 with the same shape and size as the welding hole 2112, one end of one side surface of the fan blade 22 close to the blisk 211, which is close to the rotating axis direction of the blisk 211, is concavely arranged, so that one end of one side surface of the fan blade 22 close to the blisk 211, which is far away from the rotating axis direction of the blisk 211, can be inserted into the blade slot 2111, and the welding block 221 can be correspondingly inserted into the welding hole 2112; the arrangement of the vane slot 2111 increases the contact area of the vane 22 and the vane disc 211, and increases the stability of the connection of the vane 22 and the vane disc 211.

Referring to fig. 3 and 4, eight welding grooves 2113 are formed in the surface of one side of the blisk 211, which is far away from the fan blade 22, the welding holes 2112 are communicated with the welding grooves 2113, the cross-sectional shapes of the welding grooves 2113 are the same as that of the welding holes 2112, and the cross-sectional area of the welding grooves 2113 is slightly larger than that of the welding holes 2112; the welding block 221 penetrating through the welding hole 2112 extends into the welding groove 2113, the welding block 221 is melted in an ultrasonic welding mode, the melted welding block 221 flows into the welding groove 2113 and fills the welding groove 2113, and the blade disc 211 can be fixed while the surface of the blade disc 211 is smooth; compared with the mode of fixing the fan blades 22 by casting and demolding or 3D printing, the mode of ultrasonic welding has the advantages of simple process, high efficiency and low cost.

Referring to fig. 3 and 4, an air inlet space 24 is enclosed by one end of each of the eight fan blades 22 close to the rotation axis direction of the blade disc 211, the cross-sectional shape of the wind shield 23 is circular and is the same as the size of the blade disc 211, the fan blades 22 are arranged between the blade disc 211 and the wind shield 23, the wind shield 23 and the blade disc 211 are coaxially arranged, an air inlet hole 231 with a circular cross-sectional shape is formed in the center of the wind shield 23, the air inlet hole 231 is opposite to the air inlet space 24, when the impeller 2 rotates, the air outside the impeller 2 can be sucked into the air inlet space 24 from the air inlet 231 and dispersed among the blades 22, the rotating blades 22 generate centrifugal force to throw the air out from among the blades 22, due to the arrangement of the wind shield 23, one end of the rotating fan blade 22 far away from the blade disc 211 is not easy to rub with air nearby, so that kinetic energy loss caused by wind resistance when the impeller 2 rotates is greatly reduced, and the air draft efficiency of the impeller 2 is improved.

Referring to fig. 4 and 5, an axial hole 2114 is formed in the axial position of the blade disc 211, the axial hole 2114 is used for inserting a main shaft, and the blade disc 211 can rotate around the main shaft; the axial center hole 2114 is positioned at the edge of the opening at one end of the air inlet space 24, and a convex part 2115 is formed along the rotating axis of the blade disc 211 in a direction away from the blade disc 211, the contact area of the main shaft and the blade disc 211 is increased by the arrangement of the convex part 2115, and the stability of the blade disc 211 in rotating around the main shaft is increased; the surface of the convex portion 2115 is in a circular arc transition shape, the junction of the convex portion 2115 and the hub plate 21 is in a curved arc transition shape, and the curved surface opens in a direction away from the blisk 211, the air sucked into the wind space 24 impinges on the convex portion 2115 in the direction of the rotation axis of the blisk 211, the convex portion 2115 serves as a guide for the air entering the wind space 24 because the side of the convex portion 2115 is in a curved surface transition shape at the junction with the blisk 211 and the curved surface opens in a direction away from the blisk 211, the air impinging on the convex portion 2115 smoothly changes the flow direction along the side of the convex portion 2115 and enters between the fan blades 22, and the effect of reducing noise is achieved.

Referring to fig. 3 and 4, a circumferential edge of a hole wall of the air inlet 231 extends in a direction close to the air inlet 112 to form an air guide portion 232, an annular through groove 113 is formed in an inner wall of the first casing 11 on a side close to the air inlet 231, a circumferential edge of an opening of the annular through air inlet 112 is arranged, the air guide portion 232 is arranged in the annular through groove 113, and gaps are formed between the air guide portion 232 and a side wall and a bottom of the annular through groove 113; the air outside the casing 1 directly enters the air inlet space 24 through the air guide part 232, the air guide part 232 and the groove wall of the annular through groove 113 are matched with each other to limit the air flow entering from the air inlet 112 to enter the casing 1 from the gap between the casing 1 and the wind shield 23, the air amount entering the air inlet space 24 is increased, and the air draft efficiency of the centrifugal fan is further improved.

The implementation principle of the centrifugal fan in the embodiment of the application is as follows: the impeller 2 in the casing 1 rotates, air outside the casing 1 is sucked through the air inlet, under the matching action of the air guide part 232 and the annular through groove 113, air flow directly enters the air inlet space 24 of the impeller 2, the rotating fan blades 22 throw the air out of the casing 1 along the radial direction of the impeller 2, the air pressure inside the casing 1 is increased, and the air in the casing 1 is discharged from the air outlet 13.

Embodiment 2, the present application is a household appliance to which the centrifugal fan disclosed in embodiment 1 is applied.

The centrifugal fan disclosed in embodiment 1 is applied in this embodiment, so that the centrifugal fan has the advantages of low noise, high efficiency, low energy consumption and the like.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (9)

1. An impeller (2), characterized in that: comprises a hub disc (21), a plurality of fan blades (22) and wind shields (23) which are fixedly arranged on the hub disc (21); the fan blades (22) are circumferentially arranged by taking the rotation axis direction of the hub plate (21) as an axis, and one end of each fan blade (22) close to the axis direction of the hub plate (21) forms an air inlet space (24); the wind shields (23) are arranged on the fan blades (22) at the same time, and one ends, far away from the hub disc (21), of the fan blades (22) are attached to the wind shields (23); the wind shield (23) is provided with an air inlet hole (231), and the air inlet hole (231) is communicated with the air inlet space (24).

2. An impeller (2) according to claim 1, characterized in that: the hub disc (21) is provided with a blade groove (2111), the fan blade (22) is inserted into the blade groove (2111), and the side wall of the blade groove (2111) is tightly abutted to the side surface of the fan blade (22).

3. An impeller (2) according to claim 1, characterized in that: one end, close to the hub plate (21), of each fan blade (22) is provided with a welding block (221), and the hub plate (21) is provided with a plurality of welding holes (2112) which correspond to the welding blocks (221) on each fan blade (22) in a one-to-one mode; the welding block (221) penetrates through the welding hole (2112) and the welding block (221) extends to one side surface of the hub plate (21) far away from the fan blade (22).

4. An impeller (2) according to claim 3, characterized in that: a welding groove (2113) is formed in the surface of one side, away from the fan blades (22), of the hub plate (21), and the welding hole (2112) is formed in the bottom of the welding groove (2113).

5. An impeller (2) according to claim 1, characterized in that: an axle center hole (2114) is formed in the way of penetrating through the hub plate (21), the axle center hole (2114) is located at the rotating axle center of the hub plate (21), and the axle center hole (2114) is used for penetrating through a spindle; the axial center hole (2114) is located at one end opening edge of the air inlet space (24), a bulge portion (2115) is formed in a protruding mode in the direction away from the hub disc (21) along the axial direction of the hub disc (21), the connection portion of the side face of the bulge portion (2115) and the hub disc (21) is in an arc transition shape, and the arc opening faces the direction away from the hub disc (21).

6. An impeller (2) according to claim 1, characterized in that: one end, far away from the fan blades (22), of the hub disc (21) is provided with an accommodating groove (2121), and the accommodating groove (2121) is used for accommodating a motor.

7. A centrifugal fan, its characterized in that: comprises an impeller (2) and a casing (1) according to any one of claims 1 to 6, wherein the impeller (2) is rotatably arranged in the casing (1); an air inlet (112) and an air outlet (13) are arranged on the machine shell (1), and the air inlet (112) and the air outlet (13) are communicated with the inner space and the outer space of the machine shell (1); the air inlet (112) and the air inlet hole (231) are arranged oppositely, and the air inlet space (24) is communicated with the air inlet (112).

8. The centrifugal fan according to claim 7, wherein: the air inlet structure is characterized in that a wind guide part (232) is formed by extending the circumferential direction of one edge of the hole wall of the air inlet (231) close to the air inlet (112), an annular through groove (113) is formed in the inner wall of the shell (1) close to one side of the air inlet (231), the annular through groove (113) is arranged around the opening edge of the air inlet (112) in a circumferential mode, the wind guide part (232) is arranged in the annular through groove (113), and gaps are formed among the wind guide part (232), the side wall of the annular through groove (113) and the bottom of the groove.

9. A household appliance, characterized by: comprising a centrifugal fan according to claim 7.

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