CN216044508U - Blade, impeller and centrifugal fan - Google Patents
Blade, impeller and centrifugal fan Download PDFInfo
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- CN216044508U CN216044508U CN202122019571.8U CN202122019571U CN216044508U CN 216044508 U CN216044508 U CN 216044508U CN 202122019571 U CN202122019571 U CN 202122019571U CN 216044508 U CN216044508 U CN 216044508U
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Abstract
The utility model relates to the technical field of centrifugal fans, in particular to a blade, an impeller and a centrifugal fan. The utility model provides a blade, comprising: a first body and a second body; the second body comprises a first end and a second end along the height direction of the blade, and the first body is connected with the second end; the first body and the second body are both airfoil-shaped, and the chord length of the first end part is smaller than that of the second end part. The variable chord length airfoil blade structure is arranged, the characteristic that the flow of the axial end part of the inlet of the centrifugal impeller is small can be taken into consideration, the flow attack angle of the inlet at the end part is improved through the design of the changed inlet angle of the blade and the inner diameter of the inlet, the flow impact and the separation vortex are weakened, and the leakage flow at the end part of the blade is reduced.
Description
Technical Field
The utility model relates to the technical field of centrifugal fans, in particular to a blade, an impeller and a centrifugal fan.
Background
Along with the continuous improvement of living standard and the increasing attention of health consciousness of people, people also have an increasing demand on the range hood, and simultaneously have an increasing performance requirement on the range hood.
The range hood usually adopts a multi-wing centrifugal fan, and the oil smoke is discharged to a smoke discharge pipeline by utilizing strong suction force generated by the multi-wing centrifugal fan. In the prior art, blades of a centrifugal fan generally adopt an airfoil structure, and based on the aerodynamic characteristics of the airfoil, the impeller can improve the flow characteristics in an impeller flow channel to a certain extent. The structural characteristics of the multi-wing centrifugal fan determine that airflow on the inlet surface of an impeller flow channel is not uniformly distributed in the axial direction, and particularly, the flow is obviously smaller in the area close to the end part of the impeller, so that a very large positive attack angle of the inlet of the blade is caused, and therefore the phenomena of separation and vortex in the area are more serious, and the performance of the fan is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the following problems: the existing centrifugal fan has the defects that the axial distribution of the impeller airflow is not uniform, and the performance of the fan is influenced.
(II) technical scheme
In order to solve the above technical problem, an embodiment of an aspect of the present invention provides a blade, including: a first body and a second body;
the second body comprises a first end and a second end along the height direction of the blade, and the first body is connected with the second end;
the first body and the second body are both airfoil-shaped, and the chord length of the first end part is smaller than that of the second end part.
According to an embodiment of the utility model, the chord length of the second body gradually increases in a direction from the first end to the second end.
According to one embodiment of the utility model, the cross section of the first body is the same at any position along the height direction of the blade.
According to an embodiment of the utility model, the cross-section of the second end portion is the same as the cross-section of the first body.
According to one embodiment of the utility model, the axial height of the blade is HbThe axial height of the second body is H2；
Wherein,
according to an embodiment of the utility model, the first body has a cross-section with a mean camber line length LbThe radius of the front edge of the cross section of the first body is RbLE；
The first end portion has a cross-sectional mean camber line length LtThe radius of the front edge of the cross section of the first end part is RtLE；
Wherein,
0.5mm≤RtLE＜RbLE≤1.5mm；
the relative airfoil thickness of the cross section of the first body is TRbThe relative airfoil thickness of the cross section of the first end portion is TRt；
Wherein, T is more than or equal to 0.1Rt＜TRb≤0.2。
Another utility model embodiment of the utility model provides an impeller, including the blade described in any of the above embodiments, the impeller further includes a connecting ring and a connecting plate;
the connecting ring is connected with the first end part, and the connecting plate is connected with one end of the first body, which is far away from the second end part;
the connecting plate and the blade are integrally formed.
According to one embodiment of the utility model, the blade has a first plane perpendicular to a blade height direction along which the first body has a first cross section that projects onto the first plane forming a first plane of projection;
along the blade height direction, the second body is provided with a plurality of second cross sections, and any second cross section projects to the first plane to form a second projection plane;
all of the second projection surfaces are within the first projection surface.
According to one embodiment of the utility model, the cross-section of the first body has an inlet diameter Db1The cross section of the first end part has an inlet diameter Dt1The outlet diameter of the cross section of the first body and the second end part is D2；
Wherein,
according to an embodiment of the utility model, the cross-section of the first body has an inlet mounting angle βb1The inlet mounting angle of the cross section of the first end part is betat1；
An outlet setting angle of the cross section of the first body and an outlet setting angle of the cross section of the second end portion are beta2；
Wherein beta is not less than 60 degreest1＜βb1≤80°，5°≤β2≤20°。
Another embodiment of the present invention provides a centrifugal fan, including the impeller according to any one of the above embodiments;
the centrifugal fan further comprises a volute;
the impeller is mounted within the volute.
According to one embodiment of the utility model, said centrifugal fan comprises two said impellers;
the two connecting plates are connected and oppositely arranged;
a sunken groove is formed in the center of the connecting plate, the two sunken grooves are connected to form an accommodating cavity, and a motor assembly is arranged in the accommodating cavity;
the output end of the motor assembly is connected with the two impellers respectively.
The utility model has the beneficial effects that:
the utility model provides a blade, comprising: a first body and a second body; the second body comprises a first end and a second end along the height direction of the blade, and the first body is connected with the second end; the first body and the second body are both airfoil-shaped, and the chord length of the first end part is smaller than that of the second end part.
The variable chord length airfoil blade structure is arranged, the characteristic that the flow of the axial end part of the inlet of the centrifugal impeller is small can be taken into consideration, the flow attack angle of the inlet at the end part is improved through the design of the changed inlet angle of the blade and the inner diameter of the inlet, the flow impact and the separation vortex are weakened, and the leakage flow at the end part of the blade is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of a blade provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an impeller provided in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an impeller provided in an embodiment of the present invention;
fig. 4 is a schematic view of an overall structure of a centrifugal fan according to an embodiment of the present invention;
FIG. 5 is a schematic view of a blade according to an embodiment of the present invention projected on a first plane;
FIG. 6 is a schematic view of a blade according to an embodiment of the present invention projected on a first plane;
FIG. 7 is an exploded view of the overall structure of a centrifugal fan according to an embodiment of the present invention;
FIG. 8 is an exploded view of an impeller and motor assembly provided by an embodiment of the present invention;
fig. 9 is a sectional view of a centrifugal fan according to an embodiment of the present invention.
Icon: 100-blade; 110-a first body; 111-a first plane of projection; 120-a second body; 121-a second plane of projection; 122-a first end; 123-a second end;
200-an impeller; 210-a connecting ring; 220-a connecting plate; 221-sinking the tank;
310-a volute; 320-a motor bracket; 330-shock pad; 340-wind guide ring;
410-a rotor; 420-a stator; 430-motor shaft; 440-bearings.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 9, one embodiment of the present invention provides a blade 100 including: a first body 110 and a second body 120; in the blade height direction of the blade 100, the second body 120 includes a first end 122 and a second end 123, and the first body 110 and the second end 123 are connected; the first body 110 and the second body 120 are each airfoil shaped, and a chord length of the first end portion 122 is smaller than a chord length of the second end portion 123.
The blade 100 provided by the present embodiment adopts a sectional type structure design, and the second body 120 adopts a variable chord length design, so that a gap is generated at the first end 122 of the second body 120, that is, the chord length of one end of the second body 120 away from the first body 110 is smaller than the chord length of the other end of the second body 120. The characteristic that the axial end flow of the inlet of the impeller 200 is smaller can be considered, the inlet angle and the inlet inner diameter of the blade 100 are changed, the inlet flow attack angle of the end is improved, the flow impact and the separation vortex are weakened, and the leakage flow of the end of the blade 100 is reduced.
As shown in fig. 1, in a preferred embodiment, the chord length of the second body 120 gradually increases along a direction from the first end 122 to the second end 123. The second body 120 adopts a variable chord length design, and improves the end inlet flow attack angle through the design of the inlet angle and the inlet inner diameter of the blade 100, so as to weaken the flow impact and separate the vortex, and reduce the leakage flow at the end of the blade 100.
It is understood that, in the present embodiment, the second body 120 may also have a saw-tooth structure, which may make the airflow flow more smoothly through the saw-tooth surface of the blade 100, improve the aerodynamic performance of the blade 100 and reduce noise.
As shown in fig. 1, the cross-section of the first body 110 is the same at any position along the blade height direction of the blade 100.
The blade 100 provided by the embodiment adopts a sectional type blade 100 structure design, and comprises a first body 110 with an equal section and a second body 120 with a variable section, wherein the first body 110 adopts the equal section design, so that the effective working area of the blade 100 is ensured, larger suction force can be generated to meet the normal work of a fan, and the second body 120 adopts the variable section design, so that the flow impact and the separation vortex can be weakened, and the leakage flow at the end part of the blade 100 is reduced. Meanwhile, the cross section of the blade 100 adopts an airfoil structure, so that the control on the air flow on the surface of the blade 100 can be enhanced, the flow separation generated in a flow passage of the impeller 200 is effectively reduced or even avoided, the working efficiency of the impeller 200 is improved, and the vortex noise is reduced.
It is understood that the present embodiment provides a blade 100 suitable for a centrifugal fan, and also suitable for a centrifugal device such as a centrifugal pump.
It is understood that, in this embodiment, the first body 110 may also be a structure with a variable chord length, that is, the chord length gradually increases from the top of the first body 110 to the bottom of the first body 110 along the blade height direction. It is only necessary to ensure that the airfoil cross-section at the junction of the first body 110 and the second body 120 is the same.
As shown in fig. 1, the second end 123 has the same cross-section as the first body 110.
In the vane 100 provided in the present embodiment, the cross section of the second end 123 is the same as that of the first body 110. Smooth transition between two sections of the blades 100 can be ensured, and unnecessary wind resistance is avoided from being generated to influence the working efficiency of the blades 100. At the same time, the production and manufacture of the blade 100 is facilitated.
As shown in FIG. 1, the vane 100 has an axial height HbThe axial height of the second body 120 is H2；
Wherein,
the vane 100 of the present embodiment is preferably provided when the axial height H of the second body 120 is larger than the axial height H of the second body2And the axial height H of said blade 100bSatisfy the requirement of
In the process, the range can ensure that the first body 110 has enough working area, the working capacity and the working efficiency of the blade 100 are kept, the variable cross section area of the second body 120 can be fully exerted, the flow impact and the separation vortex are weakened, and the leakage flow effect at the upper end part of the blade 100 is reduced.
As shown in fig. 1 and 5, the first body 110 has a cross-section having a mean camber line length LbThe radius of the front edge of the cross section of the first body 110 is RbLE(ii) a The first end 122 has a cross-sectional mean camber line length LtThe leading half of the cross-section of the first end 122Diameter is RtLE；
Wherein,
0.5mm≤RtLE＜RbLE≤1.5mm；
the relative airfoil thickness of the cross section of the first body 110 is TRbA cross-section of the first end portion 122 having a relative airfoil thickness TRt；
Wherein, T is more than or equal to 0.1Rt＜TRb≤0.2。
In the present embodiment, the airfoil mean camber line is a line connecting the midpoint of the local geometric thickness of the airfoil along the chord line in the blade 100. Preferably, when the first body 110 has a cross section with a mean arc length LbA leading edge radius Rb of the cross section of the first body 110LEA mean camber line length L of a cross-section of the first end 122tAnd a cross-sectional leading edge radius Rt of the first end 122LESatisfy
0.5mm≤RtLE＜RbLEWhen less than or equal to 1.5mm, can effectively guarantee that the wing section leading edge does not take place the flow separation in the angle of attack within range of broad, can widen the high-efficient operation interval of impeller 200.
Relative airfoil thickness T when the first body 110 is in cross sectionRbAnd the relative airfoil thickness T of the cross-section of the first end 122RtT is more than or equal to 0.1Rt＜TRbWhen being less than or equal to 0.2, the aerodynamic performance reduction caused by the excessive relative thickness of the airfoil of the cross section of the blade 100 can be prevented, and the influence on the overall structural strength of the blade 100 caused by the excessive relative thickness of the airfoil of the blade 100 is avoided.
As shown in fig. 2 and 3, an embodiment of the present invention further provides an impeller 200, including the blade 100 according to any of the above embodiments, where the impeller 200 further includes a connection ring 210 and a connection plate 220; the connecting ring 210 is connected to the first end 122, and the connecting plate 220 is connected to an end of the first body 110 away from the second end 123; the connecting plate 220 is integrally formed with the blade 100.
In the impeller 200 provided by this embodiment, the two ends of the vane 100 are respectively connected to the connection ring 210 and the connection plate 220, wherein the vane 100 and the connection plate 220 are integrally formed, so that the precision requirement for assembling the impeller 200 and the motor can be reduced. The impeller 200 is supported by the connection plate 220 and the connection ring 210, so that the stability of the impeller 200 during rotation can be improved.
It is understood that the integral molding in this embodiment may be a manufacturing process of integral injection molding, and may also be a manufacturing process of die casting.
As shown in fig. 5 and 6, the blade 100 has a first plane perpendicular to the blade height direction, and along the blade height direction, the first body 110 has a first cross section, and the first cross section projects onto the first plane to form a first projection plane 111; along the blade height direction, the second body 120 has a plurality of second cross sections, and any second cross section projects to the first plane to form a second projection plane 121; all of the second projection surfaces 121 are within the first projection surface 111.
In this embodiment, the blade height direction refers to the spanwise direction of the blade 100, and the first plane is any plane perpendicular to the blade height direction. Any second projection surface 121 is arranged in the first projection surface 111, so that the difficulty of integrated forming can be reduced, the process requirement of die drawing is ensured, and the mass production can be economically realized.
As shown in fig. 6, the first body 110 has a cross-sectional area with an inlet diameter Db1The cross section of the first body 110 has an outlet diameter D2(ii) a The first end portion 122 has a cross-sectional area with an entrance diameter Dt1The cross section of the second end 123 has an outlet diameter D2；
Wherein,
the impeller 200 of the present embodiment is provided when the first body 110 is connected withThe cross-section of second end 123 has an exit diameter D2An inlet diameter D of a cross section of the first body 110b1And an inlet diameter D of a cross-section of the first end 122t1All three satisfy
Meanwhile, the flow process of the gas in the flow channel of the impeller 200 can be ensured to be an accelerating process, and meanwhile, the loss of the characteristics of large air quantity, low air pressure, low noise, obvious energy-saving effect and the like of the multi-wing centrifugal fan due to the overlong flow channel of the impeller 200 is prevented.
As shown in fig. 6, the cross-section of the first body 110 has an inlet installation angle βb1The inlet mounting angle of the cross section of the first end portion 122 is betat1(ii) a The outlet setting angle of the cross section of the first body 110 and the outlet setting angle of the cross section of the second end 123 are beta2；
Wherein beta is not less than 60 degreest1＜βb1≤80°，5°≤β2≤20°。
In the impeller 200 provided in this embodiment, the inlet installation angle refers to an included angle between a tangent line of an airfoil mean camber line of the blade 100 at the inlet of the flow channel of the impeller 200 and the circumferential direction; the outlet mounting angle means: the included angle between the tangent of the camber line of the blade 100 airfoil at the outlet of the impeller 200 flow channel and the circumferential direction. Preferably, when the first body 110 has an entrance installation angle β in a cross section thereofb1And an inlet mounting angle beta of a cross-section of the first end 122t1Beta is more than or equal to 60 degreest1＜βb1When the angle is less than or equal to 80 degrees, the gas flow in the flow channel of the impeller 200 can be ensured to be an accelerating process, and meanwhile, the impact loss of the inlet of the blade 100 can be small; when the outlet setting angle of the cross section of the first body 110 and the outlet setting angle β of the cross section of the second end 123 are equal2Beta is more than or equal to 5 degrees2When less than or equal to 20 degrees, the diameter of the impeller 200 can be effectively reduced, so that the size of the impeller 200 is reduced, and the excessive space of the used equipment is avoided being occupied.
As shown in fig. 4, 7, 8 and 9, an embodiment of the present invention further provides a centrifugal fan, including at least one impeller 200 according to any one of the above embodiments; the centrifugal fan further comprises a volute 310; the impeller 200 is mounted within the volute 310.
In the centrifugal fan provided by this embodiment, the volute 310 includes the first air inlet and the air outlet, and the impeller 200 rotates in the volute 310, and a pressure difference is generated by the high-speed rotation of the impeller 200 to discharge the gas.
As shown in fig. 4, 7, 8 and 9, in practical use, the centrifugal fan includes two impellers 200; the two connecting plates 220 are connected and oppositely arranged. By providing two impellers 200, the air discharge capacity of the centrifugal fan can be improved. The connecting plate 220 also serves as a housing of the motor assembly; a sunken groove 221 is formed in the center of the connecting plate 220, the two sunken grooves 221 are connected to form an accommodating cavity, and a motor assembly is arranged in the accommodating cavity; the output end of the motor assembly is respectively connected with the two impellers 200 and drives the impellers 200 to rotate.
It can be understood that, in the present embodiment, when two impellers 200 are connected, a staggered connection mode may be adopted, that is, two blades 100 that are oppositely arranged may be staggered by a certain angle, so that aerodynamic noise may be further reduced.
In practical use, a wind guiding ring 340 is disposed at the first wind inlet of the volute 310. The air guide ring 340 is provided with a second air inlet communicated with the first air inlet, and the air guide ring 340 is used for guiding air flow into the volute 310, so that the working efficiency of the centrifugal fan is improved. Meanwhile, the sectional area of the outer edge of the air guide ring 340 is smaller than that of the first air inlet, so that gas leakage in the turbine can be effectively reduced, and the working efficiency of the centrifugal fan is improved.
As shown in fig. 4, 7, 8 and 9, the motor assembly includes a rotor 410, a stator 420 and a motor shaft 430, the stator 420 is sleeved on the motor shaft 430, and bearings 440 are further sleeved at two ends of the motor shaft 430; the connecting plate 220 is provided with a connecting hole, and two ends of the motor shaft 430 penetrate through the connecting hole and are connected with the connecting hole in a matching manner through the bearing 440. The rotor 410 is connected to a sidewall of the receiving chamber. The connection mode can be any one of connection modes such as clamping, welding and gluing. When energized, the rotor 410 rotates to drive the impeller 200 to rotate.
As shown in fig. 4, 7, 8 and 9, motor brackets 320 are installed at both sides of the scroll casing 310, and both ends of the motor shaft 430 are connected to the motor brackets 320. The two motor supports 320 can improve the stability of the impeller 200 during rotation; meanwhile, a shock absorbing pad 330 is disposed at a connection position of the motor shaft 430 and the motor bracket 320, and the shock absorbing pad 330 can reduce noise generated when the impeller 200 rotates.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (12)
1. A blade, comprising: a first body (110) and a second body (120);
in a blade height direction of the blade (100), the second body (120) comprises a first end (122) and a second end (123), the first body (110) and the second end (123) being connected;
the first body (110) and the second body (120) are both airfoil-shaped, and the chord length of the first end portion (122) is smaller than that of the second end portion (123).
2. Blade according to claim 1, wherein the chord length of the second body (120) is gradually increasing in the direction from the first end (122) to the second end (123).
3. Blade according to claim 1, wherein the cross-section at any position of the first body (110) in the blade height direction of the blade (100) is the same.
4. Blade according to claim 1, characterized in that the cross section of the second end (123) is the same as the cross section of the first body (110).
5. Blade according to claim 2, characterized in that the axial height of the blade (100) is HbThe axial height of the second body (120) is H2；
Wherein,
6. blade according to claim 2, characterized in that the mean camber line length of the cross-section of the first body (110) is LbThe radius of the leading edge of the cross section of the first body (110) is RbLE；
Cross-section of the first end (122)The mean camber line of the surface has a length LtThe first end (122) has a cross-sectional leading edge radius RtLE；
Wherein,
0.5mm≤RtLE＜RbLE≤1.5mm；
the relative airfoil thickness of the cross section of the first body (110) is TRbA cross-section of the first end (122) having a relative airfoil thickness TRt；
Wherein, T is more than or equal to 0.1Rt＜TRb≤0.2。
7. An impeller, characterized in that it comprises a blade (100) according to any one of claims 1 to 6, the impeller (200) further comprising a connection ring (210) and a connection plate (220);
the connecting ring (210) is connected with the first end portion (122), and the connecting plate (220) is connected with one end of the first body (110) far away from the second end portion (123);
the connecting plate (220) and the blade (100) are integrally formed.
8. The impeller of claim 7, wherein the blade (100) has a first plane perpendicular to a blade height direction along which the first body (110) has a first cross section that projects onto the first plane forming a first plane of projection (111);
along the blade height direction, the second body (120) is provided with a plurality of second cross sections, and any second cross section projects to the first plane to form a second projection surface (121);
all of the second projection surfaces (121) are within the first projection surface (111).
9. The impeller of claim 7, wherein the cross-section of the first body (110) has an inlet diameter Db1Cross section of the first end (122)Has an inlet diameter Dt1，
The first body (110) and the second end (123) having a cross-section with an outlet diameter D2；
Wherein,
10. the impeller of claim 7, wherein the inlet setting angle of the cross section of the first body (110) is βb1An inlet mounting angle of a cross section of the first end portion (122) is betat1；
An outlet setting angle of the cross section of the first body (110) and an outlet setting angle of the cross section of the second end (123) are beta2；
Wherein beta is not less than 60 degreest1＜βb1≤80°，5°≤β2≤20°。
11. A centrifugal fan, characterized by comprising at least one impeller (200) according to any one of claims 7 to 10;
the centrifugal fan further comprises a volute (310);
the impeller (200) is mounted within the volute (310).
12. The centrifugal fan according to claim 11, wherein the centrifugal fan comprises two of said impellers (200);
the two connecting plates (220) are connected and oppositely arranged;
a sunken groove (221) is formed in the center of the connecting plate (220), the two sunken grooves (221) are connected to form an accommodating cavity, and a motor assembly is arranged in the accommodating cavity;
the output end of the motor component is respectively connected with the two impellers (200).
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| CN202122019571.8U CN216044508U (en) | 2021-08-25 | 2021-08-25 | Blade, impeller and centrifugal fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704488A (en) * | 2022-04-02 | 2022-07-05 | 杭州老板电器股份有限公司 | Fan blade, centrifugal impeller and centrifugal fan |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704488A (en) * | 2022-04-02 | 2022-07-05 | 杭州老板电器股份有限公司 | Fan blade, centrifugal impeller and centrifugal fan |
| CN114704488B (en) * | 2022-04-02 | 2024-07-05 | 杭州老板电器股份有限公司 | Fan blade, centrifugal impeller and centrifugal fan |
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