CN217481589U - Impeller of centrifugal fan, centrifugal fan and range hood - Google Patents

Abstract

The utility model provides a centrifugal fan's impeller, including first disk body, second disk body and a plurality of blade, the second disk body sets up with first disk body interval, and the second disk body includes inner disc and outer dish, and outer dish encircles and is connected in the inner disc, and the inner disc is protruding stretching towards the direction of first disk body from outer dish, and inner disc and outer dish all are equipped with the strengthening rib, and a plurality of blades set up along the circumference interval of first disk body to connect between first disk body and outer dish. The utility model provides a centrifugal fan's impeller includes first disk body, second disk body and a plurality of blade, and the second disk body is including continuous inner disc and outer dish, all sets up the strengthening rib through at inner disc and outer dish, has changed the mode of impeller, can promote the intensity of impeller greatly to make the intensity of impeller can satisfy the intensity demand under the high rotational speed condition, in addition, can also avoid the axial runout and the runout of impeller, promoted the balancing performance of impeller at the rotation in-process. The utility model also provides a centrifugal fan and range hood.

Description

Impeller of centrifugal fan, centrifugal fan and range hood

Technical Field

The utility model relates to a fan technical field particularly, relates to a centrifugal fan's impeller, centrifugal fan and range hood.

Background

The multi-wing centrifugal impeller is used as an important core part of the range hood, and the performance of the whole range hood is directly influenced by the quality of the design of the multi-wing centrifugal impeller.

Based on the requirement of the air volume performance of the range hood and the condition of back pressure in the working environment, the multi-wing centrifugal impeller can reach higher rotating speed. However, the strength of the impeller on the market is difficult to meet the strength requirement under the condition of high rotating speed, and the service life of the impeller is low. In addition, under the condition of high rotating speed, the impeller on the market has unbalance phenomenon, and has great potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at provides a centrifugal fan's impeller, centrifugal fan and range hood to solve above-mentioned problem. The embodiment of the utility model provides an above-mentioned purpose is realized through following technical scheme.

In a first aspect, the utility model provides a centrifugal fan's impeller, including first disk body, second disk body and a plurality of blade, the second disk body sets up with first disk body interval, and the second disk body includes inner disc and outer dish, and the outer dish encircles and is connected in the inner disc, and the inner disc is protruding to be stretched towards the direction of first disk body from the outer dish, and inner disc and outer dish all are equipped with the strengthening rib, and a plurality of blades set up along the circumference interval of first disk body to connect between first disk body and outer dish.

In one embodiment, the stiffener is disposed about an axis of the second tray.

In one embodiment, the second tray body comprises a first surface and a second surface which are opposite to each other, the first surface is far away from the first tray body, the reinforcing ribs positioned on the outer tray are convexly arranged on the first surface, the second surface is provided with grooves, and the extending tracks of the grooves are the same as the extending tracks of the reinforcing ribs.

In one embodiment, the ratio of the width d of the reinforcing bars to the projection height h of the reinforcing bars satisfies: d/h is more than or equal to 2 and less than or equal to 3.

In one embodiment, the ratio of the projection height h of the reinforcing rib to the thickness t of the second disc body satisfies: h/t is more than or equal to 1 and less than or equal to 3.

In one embodiment, the second tray body is provided with a plurality of through holes which surround the axis of the second tray body and are positioned between the reinforcing ribs of the inner tray and the reinforcing ribs of the outer tray.

In one embodiment, the impeller of the centrifugal fan further comprises a third disc body, the first disc body, the second disc body and the third disc body are sequentially spaced, the blades comprise a first blade section and a second blade section which are connected, the first blade section is connected between the first disc body and the second disc body, and the second blade section is connected between the second disc body and the third disc body.

In one embodiment, the stiffener is integrally stamped and formed with the second tray body.

In a second aspect, the utility model also provides a centrifugal fan, including fan shell, motor and the impeller of the arbitrary centrifugal fan of the aforesaid, centrifugal fan's impeller sets up in the fan shell, motor and fan shell fixed connection, and the output shaft of motor and centrifugal fan's impeller connection.

The third aspect, the utility model also provides a range hood, including casing and centrifugal fan, centrifugal fan sets up in the casing.

Compared with the prior art, the utility model provides a centrifugal fan's impeller, centrifugal fan and range hood, the impeller includes first disk body, second disk body and a plurality of blade, second disk body and first disk body interval set up, the second disk body includes inner disc and outer dish, the outer dish encircles and is connected in the inner disc, the inner disc is protruding the stretching of direction of first disk body towards from the outer dish, all set up the strengthening rib through at the inner disc with the outer dish, the mode of impeller has been changed, can promote the intensity and the rigidity of impeller greatly, thereby make the intensity of impeller can satisfy the intensity demand under the high rotational speed condition, the life of impeller has been improved. In addition, the reinforcing ribs are arranged on the inner disc and the outer disc, so that axial runout and radial runout of the impeller can be avoided, the balance performance of the impeller in the rotating process is improved, and the safety performance of the impeller of the centrifugal fan, the centrifugal fan and the range hood is improved.

These and other aspects of the invention will be more clearly understood in the following description of the embodiments.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an impeller of a centrifugal fan provided by the present invention.

Fig. 2 is an exploded view of the impeller of the centrifugal fan shown in fig. 1.

Fig. 3 is a schematic structural view of a second disk body of the impeller of the centrifugal fan shown in fig. 1.

Fig. 4 is a longitudinal sectional view of a second disk body of the impeller of the centrifugal fan shown in fig. 3.

Fig. 5 is a partial enlarged view of fig. 4 at a.

Fig. 6 is a schematic structural diagram of a centrifugal fan provided by the present invention.

Fig. 7 is a schematic structural diagram of the range hood provided by the present invention.

Detailed Description

In order to facilitate understanding of the embodiments of the present invention, the embodiments of the present invention will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The inventor finds that the multi-wing centrifugal impeller can reach higher rotating speed based on the requirement of the air volume performance of the range hood and the condition of back pressure in the working environment. However, the strength of the impeller on the market is difficult to meet the strength requirement under the condition of high rotating speed, so that the service life of the impeller is short, and the impeller has great potential safety hazard.

In order to improve at least part of the problems, the applicant provides an impeller of a centrifugal fan, the centrifugal fan and a range hood, reinforcing ribs are arranged on an inner disc and an outer disc, the mode of the impeller is changed, the strength and the rigidity of the impeller can be greatly improved, the strength of the impeller can meet the strength requirement under the condition of high rotating speed, in addition, axial runout and radial runout of the impeller can be avoided, and the balance performance of the impeller in the rotating process is improved. The following describes the impeller, the centrifugal fan and the range hood of the centrifugal fan in detail with reference to the detailed description and the attached drawings.

Referring to fig. 1 to 4, the present invention provides an impeller 100 of a centrifugal fan, including a first disk body 110, a second disk body 130 and a plurality of blades 150, wherein the second disk body 130 is spaced apart from the first disk body 110, the second disk body 130 includes an outer disk 132 and an inner disk 134, the outer disk 132 surrounds and is connected to the inner disk 134, the inner disk 134 protrudes from the outer disk 132 toward the first disk body 110, the inner disk 134 and the outer disk 132 are both provided with reinforcing ribs 138, and the plurality of blades 150 are spaced apart from each other along the circumference of the first disk body 110 and are connected between the first disk body 110 and the outer disk 132.

Referring to fig. 1 and 2, in the present embodiment, the impeller 100 has a double-layer impeller structure, that is, the plurality of blades 150 may be divided into two layers. The double-layer impeller structure comprises a front disc, a middle disc and a rear disc, wherein the front disc refers to a disc body of the centrifugal fan 10 facing the air inlet end, the rear disc refers to a disc body of the centrifugal fan 10 facing away from the air inlet end, and the middle disc is located between the front disc and the rear disc and can be used for installing the motor 300. In other embodiments, the impeller 100 may also be a single layer structure, i.e., the plurality of blades 150 are arranged in a single layer. The single-layer impeller structure includes a front disk and a rear disk, wherein the front disk may be used to mount the motor 300.

The first tray 110 has a substantially circular ring shape. In the present embodiment, the first tray body 110 is a rear tray. In other embodiments, the first disc body 110 may also be a front disc, and may be specifically set according to actual situations. The first tray 110 is provided with a plurality of first insertion holes 112 for inserting and matching with the plurality of blades 150, the plurality of first insertion holes 112 are arranged at intervals along the circumferential direction of the first tray 110, and specifically, each blade 150 is inserted into one first insertion hole 112, so that the plurality of blades 150 are arranged at intervals along the circumferential direction of the first tray 110.

Referring to fig. 2 to 4, the second tray 130 is coaxially spaced apart from the first tray 110 and can be used for mounting the motor 300. When the impeller 100 has a double-layer impeller structure, the second plate 130 is a middle plate; when the impeller 100 is a single-layer impeller structure, the second tray 130 is a front tray, and may be set according to actual conditions, so as to meet the purpose of being able to mount the motor 300.

The second tray 130 includes opposing first and second surfaces 131 and 133, wherein the first surface 131 faces away from the first tray 110 and the second surface 133 faces toward the first tray 110.

The second tray 130 has a substantially hollow plate-like structure. The second tray body 130 includes an outer tray 132 and an inner tray 134, the outer tray 132 including portions of the first surface 131 and the second surface 133, the inner tray 134 also including portions of the first surface 131 and the second surface 133, wherein the outer tray 132 is generally circular and the outer tray 132 surrounds and is attached to the inner tray 134; the inner tray 134 protrudes from the outer tray 132 toward the first tray 110 such that the second tray 130 is substantially dish-shaped.

In this embodiment, the inner disc 134 and the outer disc 132 are provided with the reinforcing ribs 138, and the setting of the reinforcing ribs 138 changes the mode of the impeller 100, so that the strength and rigidity of the impeller 100 can be greatly improved, the strength of the impeller 100 can meet the strength requirement under the condition of high rotating speed, in addition, the axial runout and the radial runout of the impeller 100 can be avoided, and the balance performance of the impeller 100 in the rotating process is improved.

In the present embodiment, the reinforcing rib 138 is disposed around the axis of the second disk 130, that is, the reinforcing rib 138 has a ring-shaped structure. In the present embodiment, the number of the ribs 138 is two, and the two ribs 138 are respectively provided on the inner tray 134 and the outer tray 132. In one embodiment, the inner and outer discs 134, 132 may each be provided with a plurality of ribs 138, i.e., the number of ribs 138 may also be three or more. In another embodiment, the plurality of ribs 138 located in the inner disc 134 and the plurality of ribs 138 located in the outer disc 132 may be radially disposed, that is, the plurality of ribs 138 are disposed around the axis of the second disc 130 along the radial direction of the second disc 130, which also greatly improves the mode and strength of the impeller 100 and improves the balance performance of the impeller 100 during the rotation process.

In one embodiment, the reinforcing rib 138 is formed by integrally stamping the second disc 130, that is, the second disc 130 is an integrally formed structure, which improves the strength of the impeller 100 and the balance performance during the rotation process without increasing the material cost and the manufacturing cost of the impeller 100. In addition, since the reinforcing ribs 138 are formed by integral press forming, the flatness of the entire structure can be improved by the pressing process, and thus, the flatness of the second tray body 130 can be improved.

In this embodiment, the ribs 138 are raised from the first surface 131. The second surface 133 has a groove 1325, and the extending track of the groove 1325 is the same as the extending track of the reinforcing ribs 138, so that the thickness of the reinforcing ribs 138 is approximately equal to the thickness of other areas of the outer disc 132, that is, the strength of the impeller 100 is improved on the basis of not increasing the thickness of the impeller 100, and the light weight of the impeller 100 is ensured to adapt to the condition of high rotating speed. The recess 1325 may be formed by integrally stamped and formed ribs 138. In other embodiments, the second surface 133 may not be provided with the recess 1325, that is, the thickness of the rib 138 is greater than that of other areas of the outer disk 132, which may also enable the strength of the impeller 100 to meet the strength requirement under high rotation speed conditions.

Referring to fig. 4 and 5, in one embodiment, the ratio of the width d of the rib 138 to the protruding height h of the rib 138 satisfies: d/h is not less than 2 and not more than 3, wherein the width d of the rib 138 is the maximum width of the portion protruding from the first surface 131, and the protruding height h of the rib 138 is the height of the portion protruding from the first surface 131, and through many researches, the inventor finds that the ratio of the width d of the rib 138 to the protruding height h of the rib 138 satisfies the above numerical range, so as to improve the strength of the second tray body 130 as much as possible. When the ratio d/h of the width d of the reinforcing rib 138 to the protruding height h of the reinforcing rib 138 is less than 2, that is, under the condition that the width d of the reinforcing rib 138 is not changed, the protruding height of the reinforcing rib 138 is too small, which may result in an insignificant effect of improving the strength of the second tray body 130. When the ratio d/h of the width d of the reinforcing rib 138 to the protruding height h of the reinforcing rib 138 is greater than 3, that is, under the condition that the width d of the reinforcing rib 138 is not changed, the protruding height of the reinforcing rib 138 is too large, which results in the thinning of the thickness of the reinforcing rib 138, and also results in the insignificant or even reduced strength of the second tray 130. As an example, the width d of the ribs 138 is between 5mm and 9mm, and the height h of the ribs 138 is between 0.8mm and 3 mm.

In one embodiment, the ratio of the projected height h of the rib 138 to the thickness t of the second tray 130 satisfies: the ratio of the protruding height h of the reinforcing ribs 138 to the thickness t of the second tray body 130 is found to satisfy the above numerical range, so that the strength of the second tray body 130 can be improved as much as possible. When the ratio h/t of the protruding height h of the stiffener 138 to the thickness t of the second tray 130 is smaller than 1, that is, under the condition that the thickness t of the second tray 130 is not changed, the protruding height of the stiffener 138 is too small, which may cause the strength improvement effect of the second tray 130 to be insignificant. When the ratio h/t of the protruding height h of the stiffener 138 to the thickness t of the second tray 130 is greater than 3, that is, under the condition that the thickness t of the second tray 130 is not changed, the protruding height of the stiffener 138 is too large, which causes the thickness of the stiffener 138 to become thin, and also causes the strength of the second tray 130 to improve without significant effect or even reduce the strength of the second tray 130. As an example, the thickness t of the second tray 130 is in the range of 0.8mm to 1 mm.

The outer plate 132 is provided with a plurality of second plug holes 1327 for plug-fitting with the plurality of blades 150, each second plug hole 1327 extending through the first surface 131 and the second surface 133. A plurality of second insertion holes 1327 are spaced apart along the circumference of the second tray 130, wherein one end of each blade 150 is inserted into one first insertion hole 112, and the other end is inserted into one second insertion hole 1327.

The inner disc 134 includes a first surrounding portion 1342 and a second surrounding portion 1344, the first surrounding portion 1342 and the second surrounding portion 1344 are both disposed around the axis of the second disc 130, wherein the first surrounding portion 1342 is substantially circular, and the plane of the first surrounding portion 1342 is substantially parallel to the plane of the outer disc 132. The second surround portion 1344 is connected between the first surround portion 1342 and the outer disk 132, and the second surround portion 1344 is connected obliquely to the first surround portion 1342 and the outer disk 132, the first surround portion 1342 having an outer diameter smaller than an inner diameter of the outer disk 132. In this embodiment, the reinforcing rib 138 located on the inner tray 134 is disposed on the first surrounding portion 1342. In other embodiments, the stiffener 138 located in the inner disk 134 may also be disposed at the second surrounding portion 1344, so as to meet the purpose that the stiffener 138 located in the inner disk 134 can be matched with the stiffener 138 disposed in the outer disk 132, thereby greatly improving the mode and strength of the impeller 100 and the balance performance of the impeller 100 during the rotation process.

With continued reference to fig. 3-5, in one embodiment, the second plate 130 is provided with a plurality of through holes 136, and the plurality of through holes 136 are disposed around the axis of the second plate 130 and between the ribs 138 of the inner plate 134 and the ribs 138 of the outer plate 132. By forming the plurality of through holes 136, the weight of the second disk 130 can be reduced, thereby reducing the weight of the impeller 100. In the present embodiment, the through hole 136 is disposed in the second surrounding portion 1344. In other embodiments, the through hole 136 may be disposed in the first surrounding portion 1342 or the outer disk 132, such that the through hole 136 is located between the rib 138 of the inner disk 134 and the rib 138 of the outer disk 132.

The plurality of blades 150 are disposed at intervals in the circumferential direction of the first disc body 110, and are connected between the first disc body 110 and the outer disc 132. In the present embodiment, the impeller 100 has a double-layer impeller structure, and the blade 150 includes a first blade section 152 and a second blade section 154 connected to each other, wherein the first blade section 152 is connected between the first disk 110 and the second disk 130, and the second blade section 154 is connected between the second disk 130 and the third disk 170. In this embodiment, the impeller 100 has a double-layer impeller structure, the impeller 100 of the centrifugal fan further includes a third disk 170, and the first disk 110, the second disk 130, and the third disk 170 are sequentially spaced. The third plate 170 is a front plate and has a substantially circular ring shape. The third tray 170 is provided with a plurality of third insertion holes 172, the plurality of third insertion holes 172 are used for being inserted and matched with the plurality of blades 150, and the plurality of third insertion holes 172 are arranged at intervals along the circumferential direction of the third tray 170. For example, one end of the blade 150 is inserted into the first insertion hole 112, the other end is inserted into the third insertion hole 172, and the blade 150 is further inserted into the second insertion hole 1327.

In other embodiments, the impeller 100 may have a single-layer impeller structure, and for the impeller 100 having a single-layer impeller structure, the impeller 100 of the centrifugal fan may not include the third disk 170, and thus the blades 150 may be directly connected between the outer disks 132 of the first disk 110 and the second disk 130. For example, one end of the blade 150 is inserted into the first insertion hole 112, and the other end is inserted into the second insertion hole 1327.

To sum up, the utility model provides a centrifugal fan's impeller 100 includes first disk body 110, second disk body 130 and a plurality of blade 150, second disk body 130 sets up with first disk body 110 interval, second disk body 130 includes inner disc 134 and outer disc 132, outer disc 132 encircles and is connected in inner disc 134, inner disc 134 is protruding to be stretched towards first disk body 110's direction from outer disc 132, all set up strengthening rib 138 through inner disc 134 and outer disc 132, impeller 100's mode has been changed, can promote impeller 100's intensity and rigidity greatly, thereby make impeller 100's intensity can satisfy the intensity demand under the high rotational speed condition, in addition, can also avoid impeller 100's axial runout and radial runout, impeller 100 is rotating the equilibrium performance of in-process has been promoted.

Referring to fig. 6, the present invention further provides a centrifugal fan 10, which includes a fan casing 200, a motor 300 and an impeller 100 of the centrifugal fan, wherein the impeller 100 of the centrifugal fan is disposed in the fan casing 200, the motor 300 is fixedly connected to the fan casing 200, and an output shaft of the motor 300 is connected to the impeller 100 of the centrifugal fan.

In this embodiment, the fan housing 200 is a volute, and the volute may be provided with an air inlet and an air outlet. The motor 300 may be used to rotate the impeller 100 of the centrifugal fan such that the airflow may enter the volute via the air inlet and exit the volute via the air outlet.

To sum up, the utility model provides a centrifugal fan 10 includes fan shell 200, motor 300 and centrifugal fan's impeller 100, all set up strengthening rib 138 through inner disc 134 and the outer dish 132 at impeller 100, the mode of impeller 100 has been changed, can promote impeller 100's intensity and rigidity greatly, thereby make impeller 100's intensity can satisfy the intensity demand under the high rotational speed condition, additionally, can also avoid impeller 100's axial runout and runout, impeller 100 is rotating the balance ability of in-process, thereby the intensity and the balance ability of centrifugal fan 10 have been promoted, with the condition that adapts to the high rotational speed.

Referring to fig. 7, the present invention further provides a range hood 1, which includes a casing 50 and a centrifugal fan 10, wherein the centrifugal fan 10 is disposed in the casing 50.

To sum up, the utility model provides a range hood 1, including casing 50 and centrifugal fan 10, centrifugal fan 10 sets up in casing 50, inner disc 134 and outer disc 132 through impeller 100 at centrifugal fan all set up strengthening rib 138, impeller 100's mode has been changed, can promote impeller 100's intensity and rigidity greatly, thereby make impeller 100's intensity can satisfy the intensity demand under the high rotational speed condition, additionally, can also avoid impeller 100's axial runout and radial runout, impeller 100 is rotating the balance performance of in-process, make range hood 1's centrifugal fan 10 can adapt to the condition of high rotational speed, in order to promote range hood 1's clean oil smoke rate of inhaling.

In the present invention, the terms "assembly" and the like are to be understood broadly unless otherwise explicitly stated or limited. For example, the connection can be fixed, detachable or integrated; may be a mechanical connection; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, or they may be connected only by surface contact or through surface contact of an intermediate medium. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the terms "first," "second," and the like are used merely for distinguishing between descriptions and not intended to imply or imply a particular structure. The description of the term "some embodiments" means 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 the present disclosure, a schematic representation of the above terms does 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. Furthermore, the various embodiments or examples and features of the various embodiments or examples described in this disclosure may be combined and combined by those skilled in the art without being mutually inconsistent.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. An impeller for a centrifugal fan, the impeller comprising:

a first tray body;

the second tray body is arranged at intervals with the first tray body and comprises an inner tray and an outer tray, the outer tray surrounds and is connected with the inner tray, the inner tray extends in a protruding mode from the outer tray towards the first tray body, and reinforcing ribs are arranged on the inner tray and the outer tray; and

the blades are arranged at intervals along the circumferential direction of the first disc body and connected between the first disc body and the outer disc.

2. The impeller of a centrifugal fan as claimed in claim 1, wherein the ribs are disposed around an axis of the second disk.

3. The impeller of the centrifugal fan as claimed in claim 1, wherein the second disk body comprises a first surface and a second surface opposite to each other, the first surface faces away from the first disk body, the reinforcing ribs on the outer disk are protruded from the first surface, the second surface has grooves, and the extending tracks of the grooves and the reinforcing ribs are the same.

4. The impeller of the centrifugal fan as claimed in claim 3, wherein a ratio of the width d of the reinforcing rib to the projection height h of the reinforcing rib satisfies: d/h is more than or equal to 2 and less than or equal to 3.

5. The impeller of the centrifugal fan as claimed in claim 3, wherein a ratio of the protruding height h of the reinforcing rib to the thickness t of the second disk satisfies: h/t is more than or equal to 1 and less than or equal to 3.

6. The impeller of a centrifugal fan as claimed in claim 1, wherein the second disk body is provided with a plurality of through holes which are arranged around an axis of the second disk body and between the reinforcing ribs of the inner disk and the reinforcing ribs of the outer disk.

7. The impeller of a centrifugal fan as recited in claim 1, further comprising a third disk, the first disk, the second disk, and the third disk being spaced apart in sequence, the blades including connected first and second blade segments, the first blade segment being connected between the first disk and the second disk, the second blade segment being connected between the second disk and the third disk.

8. The impeller of a centrifugal fan as claimed in any one of claims 1 to 7, wherein the reinforcing rib is integrally press-molded from the second disk body.

9. A centrifugal fan, comprising:

a fan casing;

a motor; and

an impeller for a centrifugal fan according to any one of claims 1 to 8, the impeller for a centrifugal fan being disposed within the fan casing, the motor being fixedly connected to the fan casing, and an output shaft of the motor being connected to the impeller for a centrifugal fan.

10. A range hood, comprising:

a housing, and

a centrifugal fan as claimed in claim 9, the centrifugal fan being disposed within the casing.

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