CN207333292U - Spiral case and centrifugal blower - Google Patents

Abstract

The utility model discloses a kind of spiral case and centrifugal blower, the spiral case includes two end plates and coaming plate being oppositely arranged.It is equipped with air inlet on each end plate, the coaming plate is cylindrical in shape and axial both sides are connected with described two end plates respectively, and the circumferential both ends of the coaming plate surround air outlet with two end plates.Axial direction at least one end of the coaming plate radially bend after, be bent to form bent plate radially inward again, forming the end plate that one end of the bent plate is connected with the coaming plate is inserted in the bent plate.According to the spiral case of the utility model embodiment, since the bent plate on coaming plate and the periphery wall of coaming plate are plugged in mounting groove formed with mounting groove, end plate, the connection sealing between bent plate and coaming plate ensure that.Which thereby enhance the leakproofness of spiral case.In addition, spiral case is spliced by coaming plate and end plate, therefore the quality of spiral case is smaller, and production cost is relatively low.

Description

Volute and centrifugal fan

Technical Field

The utility model relates to a fan equipment field especially relates to a spiral case and centrifugal fan.

Background

The volute in the prior art is usually produced by adopting a casting process, so that the produced volute has higher quality and higher production cost.

In order to solve the problems, the prior art discloses a volute formed by splicing metal plates, and the volute is light in weight, low in production cost and low in sealing performance.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a spiral case, the quality of spiral case is less, and manufacturing cost is lower, and the leakproofness is better.

The utility model discloses still aim at providing one kind and have the centrifugal fan of spiral case.

According to the utility model discloses spiral case, include: the air inlet is formed in each end plate; the coaming is cylindrical, two axial sides of the coaming are respectively connected with the two end plates, and two circumferential ends of the coaming and the two end plates form an air outlet in a surrounding manner; at least one axial end of the enclosing plate is bent outwards along the radial direction and then bent inwards along the radial direction to form a bent plate, and the end plate connected with one end of the enclosing plate, which forms the bent plate, is inserted into the bent plate.

According to the utility model discloses the spiral case because the bent plate on the bounding wall is formed with the mounting groove with the periphery wall of bounding wall, and the end plate is pegged graft in the mounting groove, has guaranteed the connection leakproofness between bent plate and the bounding wall. Thereby improving the sealing of the volute. In addition, the volute is formed by splicing the surrounding plates and the end plates, so that the quality of the volute is low, and the production cost is low.

In some embodiments, the connection between the bent plate and the connected end plate is through press deformation.

In some embodiments, a first clamping hole penetrating in the thickness direction of the surrounding plate is formed in the bent plate, and a first clamping piece inserted into the first clamping hole is formed on the connected end plate.

In some embodiments, the circumferential two ends of the enclosing plate respectively extend in a direction away from the air inlet to form a tangential plate and a volute tongue, the tangential plate extends in a direction parallel to a tangent of the air inlet, the volute tongue is gradually increased in distance from the tangential plate in the direction away from the air inlet, and the tangential plate, the volute tongue and the two end plates therebetween form a diffuser pipe of the volute.

Specifically, the parts of the two end plates on the volute tongue side extend away from the tangential plate, and the parts of the two end plates outside the diffuser pipe form reinforcing plates.

More specifically, two end plates are respectively provided with a second clamping hole, and two axial ends of the enclosing plate are respectively provided with a second clamping piece inserted into the second clamping holes.

Optionally, two of said second tabs are provided in a generally perpendicular relationship at each end of said enclosure.

In some embodiments, the two end plates and the shroud are each sheet metal parts.

In some embodiments, the portion of each end plate surrounding the air inlet is integrally punched inwards to form the air guiding ring.

According to the utility model discloses centrifugal fan, include: a centrifugal rotor and a volute, the volute being according to any one of claims 1-9, the centrifugal rotor being provided within the volute.

According to the utility model discloses centrifugal fan has the quality characteristics lighter, that the leakproofness is better.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a perspective view of a centrifugal fan according to an embodiment of the present invention.

Fig. 2 is another perspective view of the centrifugal fan according to the embodiment of the present invention.

Fig. 3 is an exploded view of the overall structure of the centrifugal fan according to the embodiment of the present invention.

Fig. 4 is a front view of the centrifugal fan according to the embodiment of the present invention.

Fig. 5 is a sectional view taken along line a-a of fig. 4.

Fig. 6 is a left side view of the centrifugal fan according to the embodiment of the present invention.

Fig. 7 is a sectional view taken along line B-B of fig. 6.

Fig. 8 is a perspective view of a centrifugal wind wheel according to an embodiment of the present invention.

Fig. 9 is an exploded view of a centrifugal wind wheel according to an embodiment of the present invention.

Fig. 10 is a partial schematic view of a hub structure of a centrifugal wind wheel according to an embodiment of the present invention.

Fig. 11 is a schematic view of the shape of the blades of a centrifugal wind wheel according to an embodiment of the present invention.

Fig. 12 is a perspective view of a volute according to an embodiment of the present invention.

Fig. 13 is an exploded view of the volute according to the embodiment of the present invention.

Figure 14 is a top view of a volute of an embodiment of the present invention.

Fig. 15 is a cross-sectional view taken along line C-C of fig. 14.

Fig. 16 is an enlarged view at circle E of fig. 15.

Reference numerals:

a centrifugal fan 1000,

A volute 100,

The air inlet pipe comprises an end plate 110, an air inlet 111, an air guide ring 112, a reinforcing plate 113, a first clamping piece 114, a second clamping hole 115, a surrounding plate 120, a bent plate 121, a first clamping hole 1211, a mounting groove 122, a tangential plate 123, a volute tongue 124, a second clamping piece 125, a diffuser pipe 130, an air outlet 140, a first air inlet pipe, a second air,

Centrifugal rotor 200, blade ring 210, hub 220, slot 221, inner avoiding slot 222,

A motor frame 300, a drag reduction hole 310, a reinforcing rib 320,

An electric machine 400.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A specific structure of a centrifugal fan 1000 according to an embodiment of the present invention is described below with reference to fig. 1 to 16.

As shown in fig. 1 to 7, a centrifugal fan 1000 according to an embodiment of the present invention includes a volute 100, a centrifugal wind wheel 200, a motor 400, and a motor frame 300.

As shown in fig. 12-13, the scroll casing 100 has two opposite end plates 110 and a surrounding plate 120 connected between the two end plates 110, each end plate 110 is provided with an air inlet 111, and the two circumferential ends of the surrounding plate 120 and the two end plates 110 form an air outlet 140.

As shown in fig. 8-10, the centrifugal wind wheel 200 includes a blade ring 210 and a hub 220, the blade ring 210 is a sheet metal part, the blade ring 210 is formed by punching a whole plate to form a plurality of blades arranged at intervals, and then bending and connecting two ends of the blades, the hub 220 is sleeved in the blade ring 210, a plurality of slots 221 arranged at intervals along the circumferential direction are formed in the outer circumferential wall of the hub 220, the plurality of blades are inserted into the plurality of slots 221 in a one-to-one correspondence manner, the portions of the blade ring 210 located at two sides of the hub 220 respectively form a centrifugal wind wheel with the hub 220, and the centrifugal wind wheel 200 is arranged in the volute 100.

As shown in fig. 1 to 3, the motor frame 300 is fixed to the shroud 120, the motor 400 is provided on the motor frame 300, and a motor shaft of the motor 400 is connected to the hub 220.

It can be understood that the volute of the centrifugal fan in the prior art is generally a casting, a mold is required to be manufactured during production, and the quality of a finished product is high. Therefore, the production cost of the centrifugal fan is higher, the mass is larger, and the volute 100 of the centrifugal fan provided by the embodiment of the utility model is formed by splicing the end plate 110 and the coaming 120, so that the production cost of the volute 100 is reduced, and the weight of the fan is lightened.

It can be understood that the centrifugal wind wheel in the prior art is generally a casting, a mold is required to be manufactured during production, and the quality of a finished product is high. This results in a high production cost and a high mass of the centrifugal fan. In addition, due to the limitation of casting technology, blades of the centrifugal wind wheel cannot be manufactured very light and thin, particularly, a demolding angle is usually formed at the root of each blade for convenience of demolding, and a blade ring cannot be machined according to the optimal design, so that the air outlet volume of the centrifugal wind wheel is influenced. The utility model discloses centrifugal wind wheel adopts blade ring 210 and wheel hub 220 to peg graft and forms, and the two is the sheet metal component, can simplify centrifugal wind wheel's production technology from this, reduction in production cost alleviates wind wheel weight. In addition, because the blade ring 210 is a sheet metal part, the blades can be very light and thin, the air outlet volume of the centrifugal fan is increased, and the working noise of the fan is reduced.

It will be appreciated that the portions of the blade ring 210 on either side of the hub 220 each form a centrifugal rotor with the hub 220, corresponding to two centrifugal rotors provided in the volute 100. From this the utility model discloses centrifugal wind wheel can realize following the direction air inlet or the air-out of two differences.

According to the centrifugal fan 1000 of the embodiment of the present invention, since the volute 100 is formed by splicing the end plate 110 and the surrounding plate 120, the production cost of the fan is reduced, and the weight of the fan is reduced; because the centrifugal wind wheel 200 is formed by splicing the blade ring 210 and the hub 220, and the blade ring 210 and the hub 220 are both sheet metal parts, the production process of the centrifugal wind wheel 200 is simplified, the production cost is reduced, the weight of the wind wheel is lightened, and meanwhile, the air outlet volume of the centrifugal fan can be increased, and the working noise of the fan is reduced; because the blade rings 210 of the centrifugal wind wheel are located at the two sides of the hub 220 and form a centrifugal wind wheel with the hub 220, and the centrifugal wind wheel 200 is arranged in the volute 100, the wind inlet or the wind outlet of the fan from two different directions is realized.

In some embodiments, as shown in fig. 8, the hub 220 is axially adjustably disposed on the blade ring 210, and the centrifugal fan 1000 adjusts the amount of intake air on both sides by adjusting the position of the hub 220. From this, can realize that the air-out amount of wind of fan on two air-out directions is different, the user can design centrifugal fan 1000's air output according to actual need like this, can be higher satisfy actual need.

In some embodiments, as shown in fig. 1, the motor mount 300 is provided with a drag reducing hole 310. It can be understood that the utility model discloses centrifugal fan 1000 can follow both sides air inlet, is equipped with drag reduction hole 310 on motor frame 300 and is favorable to reducing the windage of motor frame 300 side air inlet, the intake of increase motor frame 300 side to increase centrifugal fan 1000's air output.

Specifically, as shown in fig. 1, the edge of the motor frame 300 and the portion surrounding the drag reduction hole 310 extend toward a direction away from the centrifugal wind wheel 200 to form a reinforcing rib 320. It can be understood that, because the volute 100 and the centrifugal wind wheel 200 of the centrifugal fan 1000 according to the embodiment of the present invention are formed by splicing a plurality of sheet metal parts. Therefore, the centrifugal fan 1000 has low structural strength and poor deformation resistance. The arrangement of the reinforcing ribs 320 on the motor frame 300 is advantageous to improve the structural strength of the centrifugal fan 1000 and the deformation resistance thereof.

Alternatively, as shown in fig. 1, the motor mount 300 is formed in a long plate shape, and both ends of the motor mount 300 are fixedly connected to the end plates 110 of the scroll casing 100 by screws, respectively. The motor 400 is installed at the middle portion of the motor frame 300, and the drag reduction holes 310 are formed at the portions of the motor frame 300 located at both sides of the motor 400.

In some embodiments, as shown in fig. 9 and 10, the blades and the slots 221 are formed in an arc shape having a curved shape. Therefore, when the blade is assembled, a user can smoothly insert the blade into the slot 221, and the phenomenon that the blade is deformed or even broken due to improper plugging operation is reduced.

In some implementations, as shown in fig. 9-10, the hub 220 is formed with an inner escape groove 222 at an inner end of each slot 221, each inner escape groove 222 penetrating the hub 220 in a thickness direction of the hub 220. It will be appreciated that if only the slots 221 are provided in the hub 220, the free ends of the blades are subjected to a greater force from the hub 220 and the blades may be crushed at the free ends during operation of the impeller. Therefore, the inner end of each slot 221 of the hub 220 is provided with the inner avoidance slot 222, and the contact between the free end of the blade and the hub 220 is reduced, so that the acting force of the hub 220 on the blade is reduced, the probability of deformation of the blade at the free end is reduced, and the reliability of the centrifugal wind wheel 200 is improved.

In some alternative embodiments, the inner escape slots 222 are circular. The circular inner avoiding groove 222 is easy to machine, but the inner avoiding groove 222 may be formed in a square shape, a triangular shape or other irregular shapes.

In alternative embodiments, blade ring 210 is welded to hub 220. It can be understood that if only the inserting slots 221 are used to fix the blade ring 210, when the centrifugal wind wheel 200 is told to operate, the hub 220 is very likely to shake, which causes unstable wind output of the centrifugal fan 1000 or the hub 220 flies out. Therefore, the blade ring 210 is welded and fixed on the hub 220, which can prevent the phenomenon that the wind outlet of the fan is unstable and flies out through the hub 220,

of course, the fixing connection between the blade ring 210 and the hub 220 is not limited to welding, but may be riveting, bonding, crimping, and other fixing connection.

In some alternative embodiments, hub 220 is a one-piece stamped and formed part. From this, can reduce the manufacturing cost of wheel hub 220, and then reduce centrifugal fan 1000's manufacturing cost. Because the limited conditions of the punch forming process are less, the thickness and the local structural shape of the hub 220 can be adjusted according to actual needs, so that the requirements of centrifugal wind wheels 200 of different models and different working conditions are met.

In some embodiments, as shown in fig. 12 to 13, the shroud 120 has a cylindrical shape, and both axial sides of the shroud 120 are connected to the two end plates 110, respectively, as shown in fig. 15 and 16, at least one axial end of the shroud 120 is bent radially outward and then bent radially inward to form a bent plate 121, and the end plate 110 connected to the end of the shroud 120 forming the bent plate 121 is inserted into the bent plate 121.

Here, the shroud 120 may be provided with the bent plate 121 at only one axial end, or may be provided with the bent plate 121 at both axial ends.

It should be noted that, in the volute 100 of the centrifugal fan 1000, except that the air flows through the air inlet 111 and the air outlet 140, it is preferable to ensure sealing (hereinafter, referred to as relative sealing) with the outside at other places of the volute 100, that is, outside air cannot enter the inside of the fan from other places than the air inlet 111. If the relative sealing performance of the volute 100 is low, the volute 100 may run out of wind during normal operation of the fan, which may seriously affect the operating performance of the fan.

It can be understood that, as shown in fig. 16, the bent plate 121 and the peripheral wall of the surrounding plate 120 are formed with the mounting groove 122, and the end plate 110 is inserted into the mounting groove 122, so that the connection sealing performance between the bent plate 121 and the surrounding plate 120 can be improved. Therefore, the relative sealing performance of the volute 100 can be ensured, and the phenomenon of wind leakage during normal work of the fan is avoided.

Alternatively, the bent plate 121 and the connected end plate 110 are connected by press deformation. It will be appreciated that there may be a gap between the end plate 110 and the shroud 120 simply by inserting the end plate 110 into the mounting slot 122. Therefore, the bent plate 121 and the end plate 110 are fixedly connected by means of stamping deformation, and the relative sealing performance of the volute 100 can be further improved. In addition, the operation of the stamping connection deformation mode is convenient, the thermal deformation amount of the end plate 110 and the bent plate 121 is small, and the influence on the strength of the volute 100 is small.

Of course, the fixing and connecting method of the bent plate 121 and the end plate 110 is not limited to the press-deformed connection, and may be other connecting methods such as welding, riveting, and bonding.

Specifically, as shown in fig. 12 to 14, both circumferential ends of the shroud 120 extend in a direction away from the air inlet 111 to form a tangential plate 123 and a volute tongue 124, respectively, the tangential plate 123 extends in a direction parallel to a tangent of the air inlet 111, the volute tongue 124 is gradually increased in distance from the tangential plate 123 in the direction away from the air inlet 111, the tangential plate 123, the volute tongue 124, and the two end plates 110 therebetween form a diffuser pipe 130 of the volute 100, portions of the two end plates 110 on the volute tongue 124 side extend in the direction away from the tangential plate 123, and portions of the two end plates 110 outside the diffuser pipe 130 constitute the reinforcing plate 113.

It can be understood that, since the scroll casing 100 is formed by splicing two end plates 110 and a surrounding plate 120, the scroll casing 100 has a low structural strength and a low deformation resistance. A reinforcement plate 113 is provided on the end plate 110 to help improve the deformation resistance of the scroll casing 100.

It should be noted that, in some optional embodiments of the present invention, the surrounding plate 120, the volute tongue 124 and the two end plates 110 therebetween may also form the diffuser pipe 130, that is, the volute casing 100 in this embodiment may not have the diffuser pipe, when the centrifugal fan 1000 is installed on the diffuser pipe 130 according to actual requirements, the manufacturer further configures an external diffuser pipe, and then connects the external diffuser pipe to the volute casing 100.

Specifically, as shown in fig. 13, each bent plate 121 is provided therein with a first card hole 1211 penetrating in the thickness direction of the surrounding plate 120, each end plate 110 is provided with a first card 114 inserted in the first card hole 1211, two end plates 110 are respectively provided with a second card hole 115, and two axial ends of the surrounding plate 120 are respectively provided with a second card 125 inserted in the second card hole 115.

It will be appreciated that the cooperation of the first card aperture 1211 and the first card 114 limits the sliding movement of the curved plate 121 in the radial direction thereof, and the cooperation of the second card aperture 115 and the second card 125 limits the sliding movement of the curved plate 121 in the axial direction thereof. Therefore, the end plate 110 is limited in the mounting groove 122 formed by the bent plate 121 and the shroud plate 120, and the phenomenon that the end face is pulled out when the centrifugal wind wheel 200 normally works is prevented. The working reliability of the centrifugal fan 1000 is improved, and the failure rate is reduced.

More specifically, as shown in fig. 13, at least one second tab 125 is provided on the volute tongue 124. Thus, the plurality of second tabs 125 may lift the restraining effect of the second tabs 125 on the end plate 110.

Optionally, as shown in FIG. 13, each end of the enclosure 120 is provided with two second tabs 125 in a generally perpendicular relationship. It will be appreciated that the restraint of the end plate 110 is enhanced when the two generally perpendicular second tabs 125 are bent.

Alternatively, as shown in fig. 13, the first card hole 1211 and the second card hole 115 are each formed in a long shape, and the first card 114 and the second card 125 are each formed in a long shape having a head portion in a semicircular shape. Thus, the user can insert the first card 114 and the second card 125 into the first card hole 1211 and the second card hole 115, respectively, more conveniently, and can bend the first card 114 and the second card 125 more easily.

Of course, the first card 114, the second card 125, the first card hole 1211 and the second card hole 115 may be formed in other shapes. For example, the first card hole 1211 and the second card hole 115 are each formed in a semicircular shape, a triangular shape, a square shape, or other irregular shapes, and the first card 114 and the second card 125 are formed in a columnar shape that matches the first card hole 1211 and the second card hole 115, respectively.

Of course, the shapes of the first and second card holes 1211 and 115 may be different, for example, the first card hole 1211 is formed in a semicircular shape and the second card hole 115 is formed in a triangular shape.

Alternatively, as shown in fig. 11, the chord length of each blade is between 15mm and 25 mm.

Alternatively, as shown in fig. 11, the arc of each blade is between 15mm and 25 mm.

Alternatively, as shown in FIG. 11, each blade has a thickness between 0.5mm and 1.5 mm.

It should be noted that, the above parameters can be adjusted according to actual needs, and thus the application range of the centrifugal fan 1000 according to the embodiment of the present invention can be enlarged.

In some embodiments, the portion of each end plate 110 surrounding the air inlet 111 is integrally stamped inward to form the air guiding ring 112. Therefore, the wind resistance from the end plate 110 when the airflow flows through the air inlet 111 can be reduced, and the air inlet amount of the centrifugal fan 1000 is increased, so that the air outlet amount is increased.

Alternatively, as shown in FIG. 15, the maximum diameter of the windband 112 is about 1.5 times the wind inlet 111.

Alternatively, as shown in fig. 15, the end of the wind-guiding ring 112 near the maximum diameter is formed as an oblique contracted hole inclined toward the axis near the wind-guiding ring 112 in the direction near the wind inlet 111, and the end of the wind-guiding ring 112 near the wind inlet 111 is formed as an arc-shaped enlarged hole facing away from the axis of the wind-guiding ring 112 in the direction away from the wind inlet 111.

According to the utility model discloses the air conditioner, include centrifugal fan 1000.

According to the utility model discloses air conditioner owing to contain centrifugal fan 1000, consequently it is less to have noise at work, the great characteristics of air output.

A centrifugal fan 1000 according to an embodiment of the present invention is described below with reference to fig. 1 to 16.

As shown in fig. 1 to 3, the centrifugal fan 1000 of the present embodiment includes a scroll casing 100, a centrifugal wind wheel 200, a motor 400, and a motor frame 300.

As shown in fig. 11-15, the volute 100 has two opposite end plates 110 and a surrounding plate 120 connected between the two end plates 110, each end plate 110 is provided with an air inlet 111, and a portion of each end plate 110 surrounding the air inlet 111 is integrally punched inward to form an air guiding ring 112. The two circumferential ends of the enclosure plate 120 and the two end plates 110 enclose an air outlet 140.

As shown in fig. 13, the two end plates 110 and the shroud plate 120 are sheet metal parts, the shroud plate 120 is bent into a substantially cylindrical shape, and then both axial sides thereof are connected to the two end plates 110, both axial ends of the shroud plate 120 are bent radially outward and then radially inward to form bent plates 121, and the outer peripheral edge of each end plate 110 is inserted into the corresponding bent plate 121. Each bent plate 121 is connected to the corresponding end plate 110 by press deformation.

As shown in fig. 13, both circumferential ends of the shroud 120 extend in a direction away from the air inlet 111 to form a tangential plate 123 and a volute tongue 124, the tangential plate 123 extends in a direction parallel to a tangential line of the air inlet 111, the volute tongue 124 is gradually increased in distance from the tangential plate 123 in the direction away from the air inlet 111, the tangential plate 123, the volute tongue 124 and the two end plates 110 therebetween form a diffuser pipe 130 of the volute 100, portions of the two end plates 110 on one side of the volute tongue 124 extend in the direction away from the tangential plate 123, and portions of the two end plates 110 outside the diffuser pipe 130 form a reinforcing plate 113.

As shown in fig. 13, the two bent plates 121 are each provided with a first locking hole 1211 penetrating in the thickness direction of the surrounding plate 120, the outer peripheral edge of each end plate 110 is provided with a first locking piece 114 inserted in the first locking hole 1211, the two end plates 110 are respectively provided with a second locking hole 115, and the two axial ends of the surrounding plate 120 are respectively provided with a second locking piece 125 inserted in the second locking hole 115.

As shown in fig. 8-11, the centrifugal wind wheel 200 includes a blade ring 210 and a hub 220, the blade ring 210 is a sheet metal part, the blade ring 210 is formed by punching a whole plate to form a plurality of blades arranged at intervals, and then bending and connecting two ends of the blades, the hub 220 is sleeved in the blade ring 210, a plurality of slots 221 arranged at intervals along the circumferential direction are arranged on the outer circumferential wall of the hub 220, a circular inner avoiding slot 222 is formed at the inner end of each slot 221, the blades are inserted into the slots 221 in a one-to-one correspondence manner, the parts of the blade ring 210 located at two sides of the hub 220 respectively form a centrifugal wind wheel with the hub 220, and the centrifugal wind wheel 200 is arranged in the volute 100.

As shown in fig. 11, the chord length of each blade is between 15mm and 25mm and the arc of each blade is between 15mm and 25 mm. The thickness of each blade is between 0.5mm and 1.5 mm.

As shown in fig. 3, the motor frame 300 is fixed on the shroud 120, the motor frame 300 is provided with a drag reduction hole 310, and the edge of the motor frame 300 and the part surrounding the drag reduction hole 310 extend towards the direction away from the centrifugal wind wheel 200 to form a reinforcing rib 320.

As shown in fig. 1 and 7, the motor 400 is disposed on the motor frame 300, and a motor shaft of the motor 400 is connected to the hub 220.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A spiral casing, comprising:

the air inlet is formed in each end plate;

the coaming is cylindrical, two axial sides of the coaming are respectively connected with the two end plates, and two circumferential ends of the coaming and the two end plates form an air outlet in a surrounding manner; wherein,

at least one axial end of the enclosing plate is bent outwards along the radial direction and then bent inwards along the radial direction to form a bent plate, and the end plate connected with one end of the enclosing plate forming the bent plate is inserted into the bent plate.

2. The spiral casing of claim 1 wherein the bent plate is connected to the connected end plate by a press deformation.

3. The spiral casing of claim 1 wherein the curved plate has a first engaging hole formed therein and extending therethrough in a thickness direction of the surrounding plate, and the end plate connected thereto has a first engaging piece inserted into the first engaging hole.

4. The volute of claim 1, wherein the two circumferential ends of the shroud extend in a direction away from the air inlet to form a tangential plate and a volute tongue, the tangential plate extends in a direction parallel to a tangent of the air inlet, the volute tongue increases in distance from the tangential plate in the direction away from the air inlet, and the tangential plate, the volute tongue, and the two end plates therebetween form a diffuser pipe of the volute.

5. The spiral casing of claim 4 wherein the portions of the two end plates on the volute tongue side extend away from the tangential plates, and the portions of the two end plates outside the diffuser constitute reinforcing plates.

6. The spiral casing of claim 5 wherein the two end plates are respectively provided with a second clamping hole, and the two axial ends of the surrounding plate are respectively provided with a second clamping piece inserted in the second clamping holes.

7. The spiral casing of claim 6 wherein there are two of the second tabs in a generally perpendicular relationship at each end of the shroud.

8. The spiral casing of claim 1 wherein the two end plates and the shroud are each sheet metal parts.

9. The spiral casing of any of claims 1 to 8 wherein the portion of each end plate surrounding the inlet opening is integrally stamped inward to form a wind deflector.

10. A centrifugal fan, comprising: a centrifugal rotor and a volute, the volute being according to any one of claims 1-9, the centrifugal rotor being provided within the volute.